US 3581307 A
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pnited States Patem  Inventors Jack D. McKim P. O. Box 149, Del Mar, Calif. 92014; Harold W. Ulmer, 2941 San Luis Rey, Oceanside, Calif. 92057  Appl. No. 733,156
 Filed May 29, 1968  Patented May 25, I971  DIRECT VIEW HIGH INTENSITY READOUT MODULE HAVING CONICAL LIGHT CONVEYOR  References Cited UNITED STATES PATENTS 3,164,918 1/1965 Brown l l 1 1 l l 1 n 13,ss1,307
Primary Examiner-Harold l. Pitts Attorney-Richard K. MacNeill ABSTRACT: A direct view high intensity readout module arimarily designed for seven segment digital readout systems 'n which seven incandescent bulbs are connected to a different pin of a nine terminal vacuum tube base, one of the terminals being common and one of the terminals preferably being coupled for a period indication. A light conveyor tube surrounds each of the incandescent bulbs on one end, the other end forming a segment of the seven segment numerical readout. A heat sink is in physical contact with each of the seven light conveyor tubes. A nonglare frosted face plate is cemented over the segment end of the light conveyor tubes.
IPATENTEDHAYZSIB?! 358L307 I SHEET 1 BF 2 FIG. 3
' INVENTORS JACK D; MIFK/M BY HAROLD W ULMER wand/(M 1 DIRECT VIEW HIGH INTENSITY READOU'IMODULE HAVING CONICAL LIGHT CONVEYOR TUBE BRIEF DESCRIPTION OF THE INVENTION The present invention relates to a direct view high intensity readout module and more particularly to a direct view high intensity readout module utilizing light conveyor tubes to form a segment from each individual light.
According to the invention, a plurality of light sources, such as incandescent bulbs, are electrically coupled to a base for further coupling to a socket in a device which is being read out. A light conveyor tube, which can be a conical stainless steel tube, surrounds each light source at one end and at the other end, is formed into the desired segment of light. In the conventional readout module, this will require seven light bulbs with seven conveyor tubes forming the seven segments for each module. A heat sink is then put in contact with each of the light conveyor tubes for conducting heat away from the light source and a translucent cover, such as a piece of frosted Mylar, is cemented over the ends of the conveyor tubes forming the desired segmented readout. If desired, the light conveyor tubes, once they are installed, can be potted for holding the conveyor tubes in a rigid relative position with respect to each other. The light conveyor tubes are constructed of a nonlight absorbing material. Examination of the shape of a cone deformed in this manner will show that much of the reflection of light travels in the preferred direction such as if it were reflected by innumerable mirrors.
It has been further found that if a face plate such as a piece of Mylar film or some other transparent material which is frosted on both sides is placed in close proximity to the end of the slit, the light emitted by the internally illuminated light conveyor tube shows a remarkable brightness and clarity, there being no noticeable variation in brightness over the entire segment area, and there is no side illumination of other areas of the face plate.
An object of the present invention is to provide a direct view high intensity readout module which can utilize incandescent light sources.
Another object of the invention is the provision of a direct view high intensity readout module which can utilize conventional vacuum tube bases for coupling to related equipment.
A still further object of the invention is the provision of a direct view high intensity readout module in which the light disbursement is extremely uniform.
Yet another object of the invention is the provision of a direct view high intensity readout module which is simple and inexpensive to manufacture, extremely compact and is very durable.
Other objects and many of the attendant advantages of the invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when .considered in connection with the accompanying drawing in which like reference numerals designate like parts throughout the figures thereof and wherein:
FIG. I is a perspective view of a finished module according to the present invention;
FIG. 2 is a perspective view of a portion of the module of FIG. 1;
FIG. 3 is a side elevation of a typical setup for the manufacture of the invention;
FIG. 4 is a side elevation in cross section of a portion of the module of FIG. 1;
FIG. 5 is a top view of a readout socket utilized as part of the invention; and
FIG. 6 is an exploded cross-sectional view taken along lines 6-6 of FIG. I. i
DETAILED DESCRIPTION .OF THE DRAWINGS Referring to FIG. I, a direct view high intensity readout module is shown generally at I having a plurality of readout segments II, I2, I3, 14, 15,16 and 17. A potting material I8 is shown generally surrounding the readout segments.
Referring to FIG. 2, a plurality of bulb locations is shown at 19, two of which are surrounded by light conveyor tubes 11 and 16. One end of the light conveyor tubes 11 and 16 surrounds a bulb and the other end is flattened forming readout segments.
Referring to FIG. 3, a jig for the positioning of light conveyor tubes is shown at 21 having a plurality of positioning extensions 22 around which are placed conveyor tubes 17 and 15.
Referring to FIG. 4, a heat sink 23 is shown dimensioned for surrounding light conveyor tubes and having a central potting hole 24.
Referring to FIG. 5, a mounting base is shown for mounting light sources such as incandescent bulbs thereon at 26. Mounting base 26 having a plurality of connecting pins 27, 28, 29, 31, 32, 33, 34, 36 and 39. Each of pins 27 through 34 are adapted for receiving one lead ofa light bulb, the other lead of each light bulb being connected to common pin 39; Connecting pin 36 is preferably utilized for lighting a period character shown at 20 in FIG. I.
Referring to FIG. 6, an exploded view is shown showing incandescent light bulbs at 19 being connected to pins 28 and 34 of socket base 26. Three of the light conveyor tubes are shown at I7, 13 and 11, which are separated by potting material shown generally at I8. Heat sink 23 having a central potting hole 24 is shown surrounding the potting material. Translucent frosted cover 41 is shown spacially disposed to the unit.
OPERATION Referring back to FIG. I, a typical module is shown utilizing the principles of the present invention for use as a digital readout module. A diffusing translucent frosted cover has not been placed over the segments 11 through 17, and the potting therebetween at 18, in the interest of clarity and illustration.
Referring to FIG. 2, two light conveyor tubes II and 16 are shown positioned over two of the light sources (not shown) with the other light sources shown at I9. It can be seen, that the configuration of the light conveyor tubes, in this instance,
is conical with the large end of the conical section being bent to form slots segments of the seven segment system utilized in digital readouts.
Referring to FIG. 3, ajig is shown generally at 21 with raised portions 22 dimensioned for a press fit into the slot ends of the light conveyor tubes for positioning the light conveyor tubes prior to potting. Two of the light conveyor tubes 17 and 15 are shown positioned over two of the raised portions 22.
Referring to FIG. 4, a heat sink is shown at 23 which is dimensioned for a snug fit around the light conveyor tubes to conduct heat away from the light conveyor tubes. A central potting hole is shown at 24 for filling the space between light conveyor tubes and the heat sink after it is assembled.
Referring to FIG. 5, a typical readout base is shown which is adapted for mounting the light sources, e.g., incandescent bulbs thereto. One lead from each of the incandescent bulbs is connected to pins 27, 28, 29, 31, 32, 33 and 34, and the other leads soldered to a ring attached to pin 39 which is the common return. Pin 36 is preferably utilized as a light source to illuminate a dot shown at 20 in FIG. 1.
The entire unit is shown in an exploded view in FIG. 6 whereby two light sources shown as incandescent bulbs 19, are connected to pins 28 and 34 and to the common ground pin 39. Incandescent bulbs I9 then fit into light conveyor tubes 17 and II which converge at the readout end of the module. The potting material is shown surrounding the light conveyor tubes and within heat sink 23 at I8. Translucent frosted cover 4] is shown ready to be positioned over the readout end of the module.
As can be seen, the entire unit is very economically and simply constructed and can utilize incandescent bulbs due to the use preferably of metallic light conveyor tubes.
i l 3 \s It should be understood. of course, that the foregoing disclosure relates to only a preferred embodiment of the inven' tion and that it is intended to cover only the changes and modifications of the example of the invention herein chosen for the purposes of the disclosure which do not constitute de partures from the spirit and scope of the invention We claim: 1. A direct view high intensity readout module comprising: a plurality of light sources having first and second electric leads for energization thereof; I a hollow light conveyor tube having a conical reflecting inner surface surrounding each of said light sources on one end thereof, another end of each of said light conveyor tubes being shaped to form readout indicia said hollow light conveyor tubes having a geometry for causing a direct impingement of light from said light sources to all parts of said another end; and a translucent eover fixedly attached over the face of said readout indicia. 24 The direct view high intensity readout module of claim 1 and further including:
a potting material surrounding said light conveyor tubes. 3. The direct view high intensity readout module of claim 1 and further including:
a common heat sink surrounding and abutting all of said light conveyor tubes.