CA2114397A1 - Indicating element for elevators - Google Patents
Indicating element for elevatorsInfo
- Publication number
- CA2114397A1 CA2114397A1 CA002114397A CA2114397A CA2114397A1 CA 2114397 A1 CA2114397 A1 CA 2114397A1 CA 002114397 A CA002114397 A CA 002114397A CA 2114397 A CA2114397 A CA 2114397A CA 2114397 A1 CA2114397 A1 CA 2114397A1
- Authority
- CA
- Canada
- Prior art keywords
- light emitting
- emitting diodes
- printed circuit
- circuit board
- light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B3/00—Applications of devices for indicating or signalling operating conditions of elevators
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
Abstract
ABSTRACT OF THE DISCLOSURE
An indicating element for an elevator includes a cover plate having an opening formed therein through which a lens extends. Positioned behind the lens is a light diffuser having an area formed in the shape of a symbol to be displayed. A plurality of light emitting diodes are mounted on a front surface of a printed circuit board and the diodes extend into the diffuser. The front surface of the printed circuit board, as well as the side walls of the diffuser are white to achieve a better light reflection. The lens, the diffuser and the printed circuit board are mounted on studs extending from a rear surface of the cover plate and are retained by nuts.
An indicating element for an elevator includes a cover plate having an opening formed therein through which a lens extends. Positioned behind the lens is a light diffuser having an area formed in the shape of a symbol to be displayed. A plurality of light emitting diodes are mounted on a front surface of a printed circuit board and the diodes extend into the diffuser. The front surface of the printed circuit board, as well as the side walls of the diffuser are white to achieve a better light reflection. The lens, the diffuser and the printed circuit board are mounted on studs extending from a rear surface of the cover plate and are retained by nuts.
Description
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TITLE
INDICATING ELEMENT FOR ELEVATORS
BACKGROUND OF THE INVENTION
~ The present invention relates generally to an indicating apparatus for elevators - 5 and, in particulart to a modular element for indicating information to elevator passengers.
` There is shown in the European patent application ~2110333.9, which claims - priority from the U. S. Patent Application Serial No. 07/736,084 owned by the assignee of the present application, an indicating element which utilizes light emitting diodes ~` 10 instead of incandescent bulbs for the presentation of symbols, such as for instance ., arrows of direction of travel. I ight emitting diodes are arranged in an arrow shape on a printed circuit board mounted on a lens carrier. The diodes extend into lens housings of arrow shape into which lenses are fitted on the lens carrier. On the indicating side, , the indicating element is closed by a filter plate.
y 15 A disadvantage of the above described indicating element is the complicated construction of the symbols to be presented. The lens housings in the shape of symbols or portions of symbols are attached to or molded with the lens ~rier and surround the .s lenses which is an expensive and costly process of manufacture. Furthermore, only one ,j symbol can be presented with this type of construction since the diodes and the lens housings are fixed in the shape of the symbol to be displayed.
.~
~ SUMMARY OF THE INVENTION
~ The present invention concerns an apparatus for indicating information to elevator passengers. The apparatus is an indicating element including a printed circuit board having a front surface; a plurality of light emitting diodes for indicating information mounted on the front surface of the printed circuit board; a diffuser ; .
i positioned in front of the light emitting diodes for guiding light from the light emitting diodes and for forming the light into a symbol to be displayed; and a lens positioned - in front of the diffuser through which the light in the form of a symbol is transmitted to a passenger. Also mounted on the printed circuit board is means for selectively connecting the light emitting diodes to a power supply, groups of the light emitting ::`
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1- The present invention solves the problems and eliminates the drawbacks associated with known indicating devices by providing an indicating element of modular -; design in which different symbols can be presented at an illuminalion level of incandescent bulbs and the symbols can be replaced easily by substituting diffusers and/or printed circuitboards.
BRIEF DESCRIPTION OF THE DRAWINGS
The above, as well as other advantages of the present inYentiOn, will become ~; readily apparent to those skilled in the art from the following detailed description of a preferred embodiment when considered in the light of the accompanying drawings in which:
F;g. 1 is an exploded top plan view of an indicating element in accordance with the present invention;
~, Fig. 2 is a front elevation view of the light diffuser in the indicating elementshown in the Fig. l;
Fig. 3 is a schematic diagram of the electrical circuit of the indicating element ~`~ shown in the Fig. l; and Fig. 4 is an exploded top plan view of an alternate embodiment of the indicaîingelement according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIM~NT
There is shown in the Fig. 1 an indicating element E including a cover plate 1 .:
having a front surface la, a rear surface lb and an opening 1c formed therein into which a lens 2 can be inserted from the rear surface 1b of the plate 1. The lens 2 is cup shaped with a closed forward end 2a which will extend beyond the front surface ~` la of the plate 1 and with an open rearward end 2b having an outwardly extending 30 flange 3 formed thereabout. A light diffuser 4 extends partially into the open end 2b ',',.
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TITLE
INDICATING ELEMENT FOR ELEVATORS
BACKGROUND OF THE INVENTION
~ The present invention relates generally to an indicating apparatus for elevators - 5 and, in particulart to a modular element for indicating information to elevator passengers.
` There is shown in the European patent application ~2110333.9, which claims - priority from the U. S. Patent Application Serial No. 07/736,084 owned by the assignee of the present application, an indicating element which utilizes light emitting diodes ~` 10 instead of incandescent bulbs for the presentation of symbols, such as for instance ., arrows of direction of travel. I ight emitting diodes are arranged in an arrow shape on a printed circuit board mounted on a lens carrier. The diodes extend into lens housings of arrow shape into which lenses are fitted on the lens carrier. On the indicating side, , the indicating element is closed by a filter plate.
y 15 A disadvantage of the above described indicating element is the complicated construction of the symbols to be presented. The lens housings in the shape of symbols or portions of symbols are attached to or molded with the lens ~rier and surround the .s lenses which is an expensive and costly process of manufacture. Furthermore, only one ,j symbol can be presented with this type of construction since the diodes and the lens housings are fixed in the shape of the symbol to be displayed.
.~
~ SUMMARY OF THE INVENTION
~ The present invention concerns an apparatus for indicating information to elevator passengers. The apparatus is an indicating element including a printed circuit board having a front surface; a plurality of light emitting diodes for indicating information mounted on the front surface of the printed circuit board; a diffuser ; .
i positioned in front of the light emitting diodes for guiding light from the light emitting diodes and for forming the light into a symbol to be displayed; and a lens positioned - in front of the diffuser through which the light in the form of a symbol is transmitted to a passenger. Also mounted on the printed circuit board is means for selectively connecting the light emitting diodes to a power supply, groups of the light emitting ::`
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~ ~, .. . , , . . .. . .-^ 211~397 diodes being connected in series for use with an alternating current power supply and in parallel for use with a direct current power supply. The indicating element is modular in construction since each of the lens, the light diffilser and the printed circuit board are removably retained on studs extending from a cover plate and can be easily replaced to provide for different symbols and different colors of light.
1- The present invention solves the problems and eliminates the drawbacks associated with known indicating devices by providing an indicating element of modular -; design in which different symbols can be presented at an illuminalion level of incandescent bulbs and the symbols can be replaced easily by substituting diffusers and/or printed circuitboards.
BRIEF DESCRIPTION OF THE DRAWINGS
The above, as well as other advantages of the present inYentiOn, will become ~; readily apparent to those skilled in the art from the following detailed description of a preferred embodiment when considered in the light of the accompanying drawings in which:
F;g. 1 is an exploded top plan view of an indicating element in accordance with the present invention;
~, Fig. 2 is a front elevation view of the light diffuser in the indicating elementshown in the Fig. l;
Fig. 3 is a schematic diagram of the electrical circuit of the indicating element ~`~ shown in the Fig. l; and Fig. 4 is an exploded top plan view of an alternate embodiment of the indicaîingelement according to the present invention.
DESCRIPTION OF THE PREFERRED EMBODIM~NT
There is shown in the Fig. 1 an indicating element E including a cover plate 1 .:
having a front surface la, a rear surface lb and an opening 1c formed therein into which a lens 2 can be inserted from the rear surface 1b of the plate 1. The lens 2 is cup shaped with a closed forward end 2a which will extend beyond the front surface ~` la of the plate 1 and with an open rearward end 2b having an outwardly extending 30 flange 3 formed thereabout. A light diffuser 4 extends partially into the open end 2b ',',.
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of the lens 2. The diffuser 4 has a cup shaped body 5, which body is formed in the shape of a symbol to be presented such as an upwardly pointing arrow as shown in the Fig. 2, and an outwardly extending flange 6 formed thereabout. In a manner similar to the lens 2, the body 5 is formed with a closed forward end Sa and an open rearward S end 5b about which the flange 6 is formed. In order that the light radiated by the lens 2 at the front surface la appears as white light to the observer and without shadows, the light diffuser 4 can be formed of a transparent or translucent polycarbonate material ; ~~ with a white tint.
The devices of the electrical circuit shown in Fig. 3 are mounted on a printed circuit board 7. The printed circuit board 7 has a plurality of light emitting diodes ` (LED's) LED1 through LED15 mounted on a front surface 7a thereof. Only the LED1 :.
~; and the LED2 are identified in the Fig. 1. When the front surface 7a of the board 7 is abutted against the flange 6, the LED's extend into the interior of the light diffuser 4. The LED's typically emit light with a wavelength of approximately 590 nanometers i ~ lS (nm) but, depending on the desired color, green, red or other color LED's can be used.
A plurality of switches A, B, C and D; a plurality of resistors R1 through R3; aplurality of diodes D1 through D4; and a pair of connecting wires Ll and L2 are mounted on a rear surface 7b of the printed circuit board 7. Only the switch A, the resistor R1, the diode D1 and the wires are shown in the Fig. 1. The front surface 7a , ~
` 20 of the board 7 and an inner surface of a side wall 5c of the light diffuser body S ~an be coated with a white reflective material such as paint for better reflection of light.
Two pairs of threaded bolts or studs 8 extend from the rear surface lb of the cover plate 1 for mounting the lens 2, the light diffuser 4 and the printed circuit 7. The lens 2, the light diffuser 4 and the printed circuit 7 each have two pairs of apertures (not shown) formed therein through which the studs 8 pass and each threadably engage a nut 9.
The schematic electrical circuit diagram of the Fig. 3 shows a first group of the LED's, the light emitting diodes LED1 through LEDS, connected in series; a second ~.,.
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'' 2~1~397 group of the LED's, the light emitting diodes LED6 through LED10, connected in ~ series; and a third group of the LED's, the light emitting diodes LED11 through ,; LED15, connected in series. The three groups of LED's are connected in parallel at .j :; the output of a full wave bridge rectifier circuit BR formed by the diodes D1 through 1)4. The bridge circuit has a first input terrninal I1 connected to the wire L1, an anode ` of the diode D1 and a cathode of the diode D4. The bridge circuit has a second input ~: terminal I2 connected to the wire I2, an anode of the diode D2 and a cathode of the ~, diode D3. The wires L1 and L2 can be connected to a power supply (not shown) such as a source of 120 volts AC. The bridge circuit has a first output terminal 01 connected to a cathode of each of the diodes Dl and D2. The bridge circuit has asecond output terminal 02 connected to an anode of each of the diodes D3 and D4.The LED's in each of the three groups are connected anode to cathode for current flow in one direction. A cathode of the LED LED1 is connected through the single pole switch A to the second output terminal 02 and an anode of the LED LEDS
is connected through the resistor R1 to the first output terminal 01. A cathode of the ~' LED LE:D6 is connected through the single pole switch C to the second output terminal 02 and an anode of the LED LED10 is connected through the resistor R2 to the first output terminal 01. A cathode of the LED LED11 is connected to the second output~`~" terminal 02 and an anode of the LED LED15 is connected through the resistor R3 to the first output terminal 01. The single pole switch B is connected between the cathode of the LED LEI)1 and the anode of the LED EED10 and the single pole switch . .
` " D is connected between the cathode of the LED LED6 and the anode of the LED
` LEDlS.
` When a power supply of 120 volts AC (not shown) is connected across the input ' 25 terminals I1 and I2, the first switch A and the third switch C are opened such that ` current flows alternately in opposite directions through the resistor R1 and the three ;, groups of LED's in series. Assuming that the resistors have a substantially higher ' resistance than the LED'st the second resistor R2 and the third resistor R3 are .i `~ 4 i ,.. ':
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, ., .. : . . " ~ ~ , , `~ 2~ 1~397~i ~457-70 .¦ effectively removed from the circuit. In this circuit configuration, the voltage available '`~ to light the LED's is divided equally across each group of LED's.
,`~ The circuit shown in the Fig. 3 also will operate with a power supply of 24 volts `~ DC. The 24 volts DC power supply (not shown) is connected to the input terminals 11 and I2 with either polarity. The second switch B and the fourth switch D are opened such that current flows in three parallel paths; a first path through the resistor Rl and the first group of LED's, a second path through the resistor R2 and the second group -! of LED's and a third path through the resistor R3 and the third group of LED's. Thus, the indicating element E according to the present invention can be operated on either i 10 of the two most widely available power supply voltages by selecting one of two pairs ~` of switches to be opened.
;' An alternate embodiment the indicating element according to the present '~ invention is shown in the Fig. 4. An indicating element F includes a cover plate 1, a ;i printed circuit board 7, two pairs of studs 8 and two pairs of nuts 9 which are similar to the like numbered parts of the indicating element E. Also, mounted on the printed ``~ circuit board are the LED's LEDl through LEDlS, the diodes Dl through D4, the resistors Rl through R3, the wires Ll and L2, and the switches A, B, C and D
connected together in the circuit shown in the Fig. 3. The diffuser 4 of the indicating element E is replaced by a light reflector 10 made of, for example, a white ; 20 polycarbonate material or white-coated metal material and a generally planar light diffuser 11. The diffuser 11 can be opaque except in the area where a symbol is to be presented wherein the diffuser is transparent. The reflector 10 can have a recess lOa formed in a front surface thereof for retaining the diffuser 11. The recess lOa and the . diffuser 11 can be shaped like a symbol to be displayed such as the arrow shape of the body 5 shown in the Fig. 2. The reflector 10 also has a tapered cavity lOb formed therein from the recess lOa to the rear surface for receiving the LED's, the recess lOa and the cavity lOb being surrounded by side walls of the reflector 10. A stepped, ~., .
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: ~ 8457-70 generally planar lens 12 closes the indicating element F at the opening in the cover ~plate 1 and abuts the rear surface lb with an outwardly extending flange 13.
The lenses 2 and 12, the light diffusers 4 and 11, the reflector 10 and the . ., printed c;rcuit board 7 can vary in size and shape depending on the application and the S symbols to be presented. Accordingly, the light emitting diodes LED1 through LED15 can be arranged on the printed circuit 7 in a distributed manner to best provide uniform lighting of the symbol. The indicating elements E and F are modular in construction since each of the lenses 2 and 12, the light diffusers 4 and 11, the reflector 10 and the . printed circuit board 7 are removably retained on the studs 8 and can be easily replaced 10 to provide for different symbols and different colors of light.
In accordance with the provisions of the patent statutes, the present invention has been described in what is considered to represent its preferred embodiment.
~; However, it should be noted that the invention can be practiced otherwise than as ; specifically illustrated and described without departing from its spirit or scope.
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of the lens 2. The diffuser 4 has a cup shaped body 5, which body is formed in the shape of a symbol to be presented such as an upwardly pointing arrow as shown in the Fig. 2, and an outwardly extending flange 6 formed thereabout. In a manner similar to the lens 2, the body 5 is formed with a closed forward end Sa and an open rearward S end 5b about which the flange 6 is formed. In order that the light radiated by the lens 2 at the front surface la appears as white light to the observer and without shadows, the light diffuser 4 can be formed of a transparent or translucent polycarbonate material ; ~~ with a white tint.
The devices of the electrical circuit shown in Fig. 3 are mounted on a printed circuit board 7. The printed circuit board 7 has a plurality of light emitting diodes ` (LED's) LED1 through LED15 mounted on a front surface 7a thereof. Only the LED1 :.
~; and the LED2 are identified in the Fig. 1. When the front surface 7a of the board 7 is abutted against the flange 6, the LED's extend into the interior of the light diffuser 4. The LED's typically emit light with a wavelength of approximately 590 nanometers i ~ lS (nm) but, depending on the desired color, green, red or other color LED's can be used.
A plurality of switches A, B, C and D; a plurality of resistors R1 through R3; aplurality of diodes D1 through D4; and a pair of connecting wires Ll and L2 are mounted on a rear surface 7b of the printed circuit board 7. Only the switch A, the resistor R1, the diode D1 and the wires are shown in the Fig. 1. The front surface 7a , ~
` 20 of the board 7 and an inner surface of a side wall 5c of the light diffuser body S ~an be coated with a white reflective material such as paint for better reflection of light.
Two pairs of threaded bolts or studs 8 extend from the rear surface lb of the cover plate 1 for mounting the lens 2, the light diffuser 4 and the printed circuit 7. The lens 2, the light diffuser 4 and the printed circuit 7 each have two pairs of apertures (not shown) formed therein through which the studs 8 pass and each threadably engage a nut 9.
The schematic electrical circuit diagram of the Fig. 3 shows a first group of the LED's, the light emitting diodes LED1 through LEDS, connected in series; a second ~.,.
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'' 2~1~397 group of the LED's, the light emitting diodes LED6 through LED10, connected in ~ series; and a third group of the LED's, the light emitting diodes LED11 through ,; LED15, connected in series. The three groups of LED's are connected in parallel at .j :; the output of a full wave bridge rectifier circuit BR formed by the diodes D1 through 1)4. The bridge circuit has a first input terrninal I1 connected to the wire L1, an anode ` of the diode D1 and a cathode of the diode D4. The bridge circuit has a second input ~: terminal I2 connected to the wire I2, an anode of the diode D2 and a cathode of the ~, diode D3. The wires L1 and L2 can be connected to a power supply (not shown) such as a source of 120 volts AC. The bridge circuit has a first output terminal 01 connected to a cathode of each of the diodes Dl and D2. The bridge circuit has asecond output terminal 02 connected to an anode of each of the diodes D3 and D4.The LED's in each of the three groups are connected anode to cathode for current flow in one direction. A cathode of the LED LED1 is connected through the single pole switch A to the second output terminal 02 and an anode of the LED LEDS
is connected through the resistor R1 to the first output terminal 01. A cathode of the ~' LED LE:D6 is connected through the single pole switch C to the second output terminal 02 and an anode of the LED LED10 is connected through the resistor R2 to the first output terminal 01. A cathode of the LED LED11 is connected to the second output~`~" terminal 02 and an anode of the LED LED15 is connected through the resistor R3 to the first output terminal 01. The single pole switch B is connected between the cathode of the LED LEI)1 and the anode of the LED EED10 and the single pole switch . .
` " D is connected between the cathode of the LED LED6 and the anode of the LED
` LEDlS.
` When a power supply of 120 volts AC (not shown) is connected across the input ' 25 terminals I1 and I2, the first switch A and the third switch C are opened such that ` current flows alternately in opposite directions through the resistor R1 and the three ;, groups of LED's in series. Assuming that the resistors have a substantially higher ' resistance than the LED'st the second resistor R2 and the third resistor R3 are .i `~ 4 i ,.. ':
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, ., .. : . . " ~ ~ , , `~ 2~ 1~397~i ~457-70 .¦ effectively removed from the circuit. In this circuit configuration, the voltage available '`~ to light the LED's is divided equally across each group of LED's.
,`~ The circuit shown in the Fig. 3 also will operate with a power supply of 24 volts `~ DC. The 24 volts DC power supply (not shown) is connected to the input terminals 11 and I2 with either polarity. The second switch B and the fourth switch D are opened such that current flows in three parallel paths; a first path through the resistor Rl and the first group of LED's, a second path through the resistor R2 and the second group -! of LED's and a third path through the resistor R3 and the third group of LED's. Thus, the indicating element E according to the present invention can be operated on either i 10 of the two most widely available power supply voltages by selecting one of two pairs ~` of switches to be opened.
;' An alternate embodiment the indicating element according to the present '~ invention is shown in the Fig. 4. An indicating element F includes a cover plate 1, a ;i printed circuit board 7, two pairs of studs 8 and two pairs of nuts 9 which are similar to the like numbered parts of the indicating element E. Also, mounted on the printed ``~ circuit board are the LED's LEDl through LEDlS, the diodes Dl through D4, the resistors Rl through R3, the wires Ll and L2, and the switches A, B, C and D
connected together in the circuit shown in the Fig. 3. The diffuser 4 of the indicating element E is replaced by a light reflector 10 made of, for example, a white ; 20 polycarbonate material or white-coated metal material and a generally planar light diffuser 11. The diffuser 11 can be opaque except in the area where a symbol is to be presented wherein the diffuser is transparent. The reflector 10 can have a recess lOa formed in a front surface thereof for retaining the diffuser 11. The recess lOa and the . diffuser 11 can be shaped like a symbol to be displayed such as the arrow shape of the body 5 shown in the Fig. 2. The reflector 10 also has a tapered cavity lOb formed therein from the recess lOa to the rear surface for receiving the LED's, the recess lOa and the cavity lOb being surrounded by side walls of the reflector 10. A stepped, ~., .
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: ~ 8457-70 generally planar lens 12 closes the indicating element F at the opening in the cover ~plate 1 and abuts the rear surface lb with an outwardly extending flange 13.
The lenses 2 and 12, the light diffusers 4 and 11, the reflector 10 and the . ., printed c;rcuit board 7 can vary in size and shape depending on the application and the S symbols to be presented. Accordingly, the light emitting diodes LED1 through LED15 can be arranged on the printed circuit 7 in a distributed manner to best provide uniform lighting of the symbol. The indicating elements E and F are modular in construction since each of the lenses 2 and 12, the light diffusers 4 and 11, the reflector 10 and the . printed circuit board 7 are removably retained on the studs 8 and can be easily replaced 10 to provide for different symbols and different colors of light.
In accordance with the provisions of the patent statutes, the present invention has been described in what is considered to represent its preferred embodiment.
~; However, it should be noted that the invention can be practiced otherwise than as ; specifically illustrated and described without departing from its spirit or scope.
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Claims (20)
1. In an indicating element for elevators, having at least one light emitting diode for indicating information mounted on a front surface of a printed circuit board and a lens positioned in front of the printed circuit board through which light generated by the light emitting diode is transmitted to a passenger, the improvement comprising:
means for guiding light from the light emitting diode to the lens and for forming the light into a symbol to be displayed through the lens.
means for guiding light from the light emitting diode to the lens and for forming the light into a symbol to be displayed through the lens.
2. The indicating element according to claim 1 wherein said means for guiding light includes a white reflective material coating on the front surface of the printed circuit board and a diffuser positioned between the printed circuit board and the lens, said diffuser having side walls extending about the light emitting diode and coated with a white reflective material.
3. The indicating element according to claim 1 wherein said means for guiding light includes a diffuser positioned between the printed circuit board and the lens, said diffuser being formed of a transparent polycarbonate material having a white tint and having side walls extending about the light emitting diode.
4. The indicating element according to claim 1 wherein said means for guiding includes a reflector and a diffuser positioned between said printed circuit board and the lens, said reflector having side walls surrounding a cavity into which the light emitting diode extends.
5. The indicating element according to claim 4 wherein said reflector is formed of a white polycarbonate material.
6. The indicating element according to claim 4 wherein said reflector is formed of a white coated metal material.
7. The indicating element according to claim 4 wherein said reflector, said diffuser and the lens are each generally planar.
8. The indicating element according to claim 4 wherein the printed circuit board, said reflector, said diffuser and the lens are releasably mounted on at least a pair of studs extending from a rear surface of a cover plate.
9. The indicating element according to claim 1 including a plurality of light emitting diodes mounted on the front surface of the printed circuit board, at least two of said light emitting diodes being connected together in a first group and at least two other ones of said light emitting diodes being connected together in a second group, and switch means for selectively connecting said first and second groups of light emitting diodes in series to a higher voltage power supply and in parallel to a lower voltage power supply.
10. The indicating element according to claim 9 wherein said light emitting diodes emit light having a wavelength of approximately 590 nm.
11. An indicating element for elevators comprising:
a printed circuit board having a front surface;
a plurality of light emitting diodes for indicating information mounted on said front surface of said printed circuit board;
a lens positioned in front of said printed circuit board through which light generated by said light emitting diodes is transmitted to a passenger; and means for guiding light from said light emitting diodes to said lens and for forming the light into a symbol to be displayed through said lens.
a printed circuit board having a front surface;
a plurality of light emitting diodes for indicating information mounted on said front surface of said printed circuit board;
a lens positioned in front of said printed circuit board through which light generated by said light emitting diodes is transmitted to a passenger; and means for guiding light from said light emitting diodes to said lens and for forming the light into a symbol to be displayed through said lens.
12. The indicating element according to claim 11 wherein said means for guiding light includes a white reflective material coating on said front surface of said printed circuit board and a diffuser positioned between said light emitting diodes and said lens, said diffuser having side walls surrounding a cavity into which said light emitting diodes extend.
13. The indicating element according to claim 11 wherein said means for guiding light includes a reflector and a diffuser positioned between said printed circuit board and said lens, said reflector having side walls surrounding a cavity into which said light emitting diodes extend.
14. The indicating element according to claim 13 wherein said reflector is formed of a white polycarbonate material.
15. The indicator element according to claim 13 wherein said reflector is formed of a white coated metal material.
16. The indicating element according to claim 11 including means for selectively connecting said light emitting diodes to a power supply, said means for selectively connecting being mounted on said printed circuit board.
17. An indicating element for elevators comprising:
a printed circuit board having a front surface;
a plurality of light emitting diode for indicating information mounted on said front surface of said printed circuit board;
a diffuser positioned in front of said light emitting diodes for guiding light from said light emitting diodes and for forming the light into a symbol to be displayed; and a lens positioned in front of said diffuser through which the light in the form of a symbol is transmitted to a passenger.
a printed circuit board having a front surface;
a plurality of light emitting diode for indicating information mounted on said front surface of said printed circuit board;
a diffuser positioned in front of said light emitting diodes for guiding light from said light emitting diodes and for forming the light into a symbol to be displayed; and a lens positioned in front of said diffuser through which the light in the form of a symbol is transmitted to a passenger.
18. The indicating element according to claim 17 including means for selectively connecting said light emitting diodes to a power supply, said means for selectively connecting being mounted on said printed circuit board.
19. The indicating element according to claim 18, wherein a first plurality of said light emitting diodes are connected together in a first group, a second plurality of said light emitting diodes are connected together in a second group and a third plurality of said light emitting diodes are connected together in a third group, said means for selectively connecting including first switch means for connecting said groups in series to a power supply and a second switch means for connecting said groups in parallel to a power supply.
20. The indicating element according to claim 18 wherein a first plurality of said light emitting diodes are connected together in a first group, a second plurality of said light emitting diodes are connected together in a second group and a third plurality of said light emitting diodes are connected together in a third group, and including a full wave rectifier bridge circuit having a pair of input terminals for connection to a power supply and a pair of output terminals connected to said light emitting diodes, a first switch means for connecting said groups in series to light said light emitting diodes when an alternating current power supply is connected to said input terminals and a second switch means for connecting said groups in parallel to light said light emitting diodes when a direct current power supply is connected to said input terminals.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US1375793A | 1993-02-04 | 1993-02-04 | |
| US08/013,757 | 1993-02-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2114397A1 true CA2114397A1 (en) | 1994-08-05 |
Family
ID=21761601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002114397A Abandoned CA2114397A1 (en) | 1993-02-04 | 1994-01-26 | Indicating element for elevators |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US5433295A (en) |
| EP (1) | EP0609710B1 (en) |
| JP (1) | JPH06247648A (en) |
| KR (1) | KR940019586A (en) |
| CN (1) | CN1093057A (en) |
| AT (1) | ATE155114T1 (en) |
| BR (1) | BR9400423A (en) |
| CA (1) | CA2114397A1 (en) |
| DE (1) | DE59403265D1 (en) |
| ES (1) | ES2106375T3 (en) |
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| US5889241A (en) * | 1997-06-10 | 1999-03-30 | Inventio Ag | Indicating device for elevators |
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| US7775685B2 (en) * | 2003-05-27 | 2010-08-17 | Cree, Inc. | Power surface mount light emitting die package |
| US7218306B2 (en) * | 2002-12-03 | 2007-05-15 | Valmark Industries, Inc. | Display device |
| GB2397943B (en) * | 2003-01-18 | 2006-04-05 | Alan Broadbent | High output energy efficient LED lamp |
| TWI282773B (en) * | 2003-10-31 | 2007-06-21 | Toshiba Elevator Kk | Lighting apparatus of elevator |
| KR100655894B1 (en) * | 2004-05-06 | 2006-12-08 | 서울옵토디바이스주식회사 | Light Emitting Device |
| KR100658700B1 (en) * | 2004-05-13 | 2006-12-15 | 서울옵토디바이스주식회사 | Light emitting device with RGB diodes and phosphor converter |
| KR100665298B1 (en) * | 2004-06-10 | 2007-01-04 | 서울반도체 주식회사 | Light emitting device |
| KR100665299B1 (en) * | 2004-06-10 | 2007-01-04 | 서울반도체 주식회사 | Luminescent material |
| US8308980B2 (en) * | 2004-06-10 | 2012-11-13 | Seoul Semiconductor Co., Ltd. | Light emitting device |
| CN100516631C (en) * | 2004-09-27 | 2009-07-22 | 陈仕群 | LED lamp |
| KR101138944B1 (en) * | 2005-01-26 | 2012-04-25 | 서울옵토디바이스주식회사 | Light emitting device having a plurality of light emitting cells connected in series and method of fabricating the same |
| US7980743B2 (en) * | 2005-06-14 | 2011-07-19 | Cree, Inc. | LED backlighting for displays |
| US20060292747A1 (en) * | 2005-06-27 | 2006-12-28 | Loh Ban P | Top-surface-mount power light emitter with integral heat sink |
| KR101258397B1 (en) * | 2005-11-11 | 2013-04-30 | 서울반도체 주식회사 | Copper-Alkaline-Earth-Silicate mixed crystal phosphors |
| KR101055772B1 (en) * | 2005-12-15 | 2011-08-11 | 서울반도체 주식회사 | Light emitting device |
| KR100875443B1 (en) * | 2006-03-31 | 2008-12-23 | 서울반도체 주식회사 | Light emitting device |
| KR101258227B1 (en) * | 2006-08-29 | 2013-04-25 | 서울반도체 주식회사 | Light emitting device |
| CN101784636B (en) | 2007-08-22 | 2013-06-12 | 首尔半导体株式会社 | Non stoichiometric tetragonal copper alkaline earth silicate phosphors and method of preparing the same |
| KR101055769B1 (en) | 2007-08-28 | 2011-08-11 | 서울반도체 주식회사 | Light-emitting device adopting non-stoichiometric tetra-alkaline earth silicate phosphor |
| US7845829B2 (en) * | 2008-05-20 | 2010-12-07 | Abl Ip Holding Llc | Enclosures for LED circuit boards |
| DE102009030205A1 (en) * | 2009-06-24 | 2010-12-30 | Litec-Lp Gmbh | Luminescent substance with europium-doped silicate luminophore, useful in LED, comprises alkaline-, rare-earth metal orthosilicate, and solid solution in form of mixed phases arranged between alkaline- and rare-earth metal oxyorthosilicate |
| KR101055762B1 (en) * | 2009-09-01 | 2011-08-11 | 서울반도체 주식회사 | Light-emitting device employing a light-emitting material having an oxyosilicate light emitter |
| KR101116037B1 (en) * | 2009-10-14 | 2012-02-22 | 장귀경 | A elevator hall separation object have a display equipment |
| US20130099687A1 (en) * | 2011-10-24 | 2013-04-25 | Marcus Zhang | Ac led drive circuit |
| US9315362B2 (en) | 2013-01-30 | 2016-04-19 | Thyssenkrupp Elevator Corporation | Snap-fit elevator lanterns |
| CN103982806A (en) * | 2014-06-06 | 2014-08-13 | 广州南艺灯光音响实业有限公司 | Multi-surface reflecting LED (light-emitting diode) mixed color light path device |
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-
1994
- 1994-01-19 KR KR1019940000958A patent/KR940019586A/en not_active Application Discontinuation
- 1994-01-20 DE DE59403265T patent/DE59403265D1/en not_active Expired - Fee Related
- 1994-01-20 EP EP94100774A patent/EP0609710B1/en not_active Expired - Lifetime
- 1994-01-20 AT AT94100774T patent/ATE155114T1/en not_active IP Right Cessation
- 1994-01-20 JP JP6004655A patent/JPH06247648A/en active Pending
- 1994-01-20 ES ES94100774T patent/ES2106375T3/en not_active Expired - Lifetime
- 1994-01-26 CA CA002114397A patent/CA2114397A1/en not_active Abandoned
- 1994-01-31 CN CN94101515A patent/CN1093057A/en active Pending
- 1994-02-03 BR BR9400423A patent/BR9400423A/en not_active IP Right Cessation
- 1994-07-07 US US08/271,555 patent/US5433295A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| EP0609710A1 (en) | 1994-08-10 |
| CN1093057A (en) | 1994-10-05 |
| EP0609710B1 (en) | 1997-07-09 |
| ES2106375T3 (en) | 1997-11-01 |
| JPH06247648A (en) | 1994-09-06 |
| DE59403265D1 (en) | 1997-08-14 |
| ATE155114T1 (en) | 1997-07-15 |
| KR940019586A (en) | 1994-09-14 |
| BR9400423A (en) | 1994-08-23 |
| US5433295A (en) | 1995-07-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |