|Publication number||US20060249584 A1|
|Application number||US 11/441,795|
|Publication date||Nov 9, 2006|
|Filing date||May 26, 2006|
|Priority date||Jul 14, 1992|
|Also published as||DE4448034B4, US5475207, US5705802, US5837988, US6568598, US6974084, US6991169, US7198195, US7780087, US20030201326, US20040217175, US20060124745, US20090188980|
|Publication number||11441795, 441795, US 2006/0249584 A1, US 2006/249584 A1, US 20060249584 A1, US 20060249584A1, US 2006249584 A1, US 2006249584A1, US-A1-20060249584, US-A1-2006249584, US2006/0249584A1, US2006/249584A1, US20060249584 A1, US20060249584A1, US2006249584 A1, US2006249584A1|
|Inventors||Mohan Bobba, Jorge Acosta, Timothy Eusterman, James Ring, Alexander McQueen|
|Original Assignee||Psc Scanning, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (74), Referenced by (10), Classifications (16), Legal Events (3)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation of application Ser. No. 11/341,071 filed Jan. 27, 2006, which is a continuation of application Ser. No. 10/858,909 filed Jun. 1, 2004, now U.S. Pat. No. 6,991,169, which is a continuation of application Ser. No. 10/431,070, filed May 6, 2003, now U.S. Pat. No. 6,974,084, which is a continuation of application Ser. No. 09/078,196, filed May 13, 1998, now U.S. Pat. No. 6,568,598, which is a divisional of application Ser. No. 08/806,194, filed Feb. 26, 1997, now U.S. Pat. No. 5,837,988, which is a divisional of application Ser. No. 08/554,819, filed Nov. 7, 1995, now U.S. Pat. No. 5,705,802, which is a divisional of application Ser. No. 08/155,112, filed Nov. 19, 1993, now U.S. Pat. No. 5,475,207, which is a continuation-in-part of application Ser. No. 07/913,580, filed Jul. 14, 1992, now abandoned.
The field of the present invention relates to optical scanning systems and particularly to a scanning system capable of successfully reading objects aligned in a variety of orientations. The invention is especially suitable for use as a fixed scanner such as that employed at a supermarket checkout counter reading bar codes such as those found on consumer products.
For effective and accurate performance, a bar code scanner depends upon focused optics and scanning geometry. Fixed scanners frequently employ a rotating polygon mirror which directs a scanning beam toward a mirror array for generating a desired scan pattern. One type of fixed bar code scanner positions a scan engine in a base with a scan window oriented in a horizontal plane. One such scanning system is disclosed in U.S. Pat. No. 5,073,702, in which a scanning beam is reflected off a mirror array which has a plurality of mirrors arranged in a generally semicircular pattern. The scanning beam reflecting off each of the mirrors has vertically upward component thereby passing through the window/aperture. Objects to be scanned are passed over the window with the bar codes oriented in a generally downward direction.
In another scanner orientation, the scan engine is housed in a vertical tower with the scan window oriented in a vertical plane. In such a vertical scanner, generally all the outgoing scan beams come out sidewards also have an upward vertical component. Objects to be scanned are passed in front of the window with the bar codes oriented in a generally sideward direction.
In order to produce a successful scan, an object must be oriented with its bar code passed in front of the scan window at an angle which is not so oblique as to prevent a scan line from striking or “seeing” the bar code. Therefore, to achieve a successful scan, the user must position the object with the bar code placed sufficiently close to the desired orientation. The range of suitable plane orientation of the object bearing the bar code is limited by the size of the window and the angle over which the mirror array can direct a scan pattern. Present vertical scanners can scan bar codes oriented on certain lateral sides (i.e., side facing) which face the vertical window, but experience difficulties in scanning faces oriented in a horizontal plane (i.e., facing up or down) or lateral sides opposite the window. Horizontal scanners (i.e., upward facing) are fairly adept at scanning the bottom side but are frequently limited as to which lateral sides may be scanned. The present inventors have recognized that it would be desirable to increase the range of plane orientation readable by a scanning system which would minimize required bar code label orientation, support belt to belt (automatic) scanning, and otherwise provide for improved scanning ergonomics.
The present invention relates to an optical system and method for data reading. A first preferred system is directed to a scanner which includes means for generating a first optical beam and a second optical beam, the first optical beam being directed toward one side of a first scanning optical element such as a rotating polygon mirror and to a first mirror array, the second optical beam being directed toward a second scanning optical element such as another side of the rotating polygon mirror and then to a second mirror array. The first mirror array is configured to generate a scan pattern having an apparent source from one orthogonal direction and the second mirror array is configured to generate a scan pattern having an apparent source from another orthogonal direction. A second preferred system is directed to a scanner having a housing with a generally vertical window in an upper housing section and a generally horizontal window in a lower housing section The scanner includes a light source generating a light beam and a beam splitter dividing the light beam into a first optical beam and a second optical beam. The first optical beam is directed toward one side of a scanning optical element, then to a first mirror array located in the upper housing section adjacent the vertical window, and then out the vertical window. The second optical beam is directed toward another side of the scanning optical element with a first portion of the second optical beam being directed to a second mirror array located in a first side of the lower housing section adjacent the upper housing portion and then through the horizontal window and with a second portion of the second optical beam being directed to a third mirror array located in a second side of the lower housing opposite the first side thereof. In a preferred embodiment, return signals detected from both the first and second optical beams are processed by a single microprocessor to allow for unified signal processing.
Additional aspects and advantages of this invention will be apparent from the following detailed description of preferred embodiments, which proceeds with reference to the accompanying drawings.
The preferred embodiments will now be described with reference to the drawings.
The scanner 10 generates a scan volume generally designated 5 by scanning beams projected outwardly through lower and upper windows 20 and 25. In order to facilitate referral to relative directions, orthogonal coordinates (X, Y, Z) are designated in
The scan engine of scanner 10 has a central rotating polygon mirror 30 driven by a motor 40. In the lower housing portion 14, a light source 76 generates a beam of light and directs it toward mirror 74. The light source 76 may be a laser, laser diode, or any other suitable source. The mirror 74 focuses and reflects light toward the polygon mirror 30 which has four mirror facets 31, 32, 33, 34. As the polygon mirror 30 rotates, the outgoing beam is directed across the lower mirror array 80 and then reflected out through the lower window 20 to achieve a desired scan pattern. Light reflecting off the target returns via the same path and is collected by a collection mirror 72 and focused onto a detector 79. The polygon mirror 30 is preferably molded in a single piece out of emanating, but could be constructed out of acrylic or other optical materials including other plastics, metals or glass by one skilled in the art. The outer surface of each mirror facet may be advantageously coated with a suitable high reflective coating, the coating chosen would depend upon the optical material of the polygon mirror 30. For example, a emanating or acrylic facet may have a metallic coating such as aluminum or gold, while a metal or glass facet may be preferably coated with a single or multi-layered dielectric such as silicon dioxide (SiO2) or titanium dioxide.
The outgoing beam mirror 74 and the incoming collection mirror 72 are also preferably an integral unit of one-piece construction forming a mirror unit 70. Both mirror elements are optically powered, the smaller outgoing mirror 74 being parabolic and the larger collection mirror 72 being ellipsoidal.
Simultaneously (or intermittently if desired) to the operation of the lower scan generation, an upper light source 56 generates a beam of light and directs it toward mirror 54. The light source 56 may be a laser, laser diode, or any other suitable source. The mirror 54 focuses and reflects light toward the polygon mirror 30. As the polygon mirror 30 rotates, the outgoing beam is directed across the upper mirror array 60 and then reflected out through the upper window 25 to achieve a desired scan pattern. Light scattered off the target returns the same path and is collected by a collection mirror 52, reflecting off fold mirror 58 and focused onto a detector 59. The outgoing beam mirror 54 and the incoming collection mirror 52 are preferably an integral unit of one-piece construction forming a mirror unit 50. Both mirror elements are optically powered, the smaller outgoing mirror 54 being parabolic and the larger collection mirror 52 being ellipsoidal.
Outgoing light beam from the upper source 56 reflects off one side of the polygon mirror 30 while simultaneously the light beam from the lower source 76 reflects off an opposite side of the polygon mirror 30. The upper mirror array 60 cooperates with the rotating polygon mirror 30 to generate the scan pattern 90 shown in
The lower mirror array 80 cooperates with the rotating polygon mirror 30 to generate the scan pattern 95 shown in
As shown in
The upper window 25 is arranged at an oblique angle θ to the vertical lower window 20 of about 150°. The lower window 20 and upper window 25 are preferably constructed from glass, plastic or other suitable material. In an application where it is anticipated objects may strike the window, it may be coated with a suitable scratch resistant coating or even constructed of sapphire. The lower and upper windows may constitute first and second window elements or may simply be apertures through which the scanning beams pass. The first window element is defined to be oriented in a first aperture plane and the second window element is defined to be oriented in a second aperture plane, the first aperture plane being oriented at an angle θ to the second aperture plane. Preferably the angle θ is greater than 90° and somewhat less than 180°, with a preferred angle of 150°.
Though in actuality the scan patterns generated by each mirror array 60, 80 are truly three dimensional, the scanning sweep generated by each of the mirror arrays may be generally described as a scan plane, the plane being defined by a median of scan lines emanating from the respective mirror array, positioning the plane in a coplanar orientation with the semicircle of the mirror array. By positioning the mirror arrays 60, 80 on opposite sides of the polygon mirror 30, the scan planes emanating from the mirror arrays intersect in the scan volume, the volume through which the objects to be scanned are passed. In an application of a vertically oriented scanner in a market checkout stand, the angle of the intersecting scan planes is preferably between about 30° and 90° with a preferred angle of about 60°.
Though the preferred scanning system is described as a fixed scanner with objects bearing a symbol such as a bar code being passed through the scan volume, alternately the scanner and the scan volume may be moved past a stationary object. Such a configuration may be desirable for inventory management or large object scanning applications for example. In either the fixed or moving scanner case, the object is being passed through the scan volume.
Alternately, the scanner window (if a single window is employed) or the scanner windows 20, 25 may comprise holographic elements to provide additional scan pattern directional control. As described above,
The configuration may also include additional components depending upon the application. For example, an optical element 58, 78 such as an aperture, filter or grating may be positioned in the outgoing light path to block out undesirable incoming light rays or provide some other desired function.
Alternately, such a design may be configured with a rotating or pivoting fold mirror (for example in place of the beam splitter 224) which would alternately direct the light beam toward the fold mirror 227 or directly to the polygon mirror 230.
When the mirror portion 252 is aligned in the beam path, the light beam is reflected toward the polygon mirror 240 and returning signal is reflected back to the collection lens which focuses the collected beam onto detector 239. When the void portion 256 is aligned in the beam path, the light beam passes therethrough and is then reflected off fold mirror 242 toward the polygon mirror 240 and returning signal is reflected back off the fold mirror 242, passing through the void portion 256 and on to the collection lens which focuses the collected beam onto detector 239. The relative size of the mirror portion 252 and the void portion 256 may be selected to adjust the relative amount that the upper and lower scanning is operated. In the preferred embodiment, a majority of the scanning beam would be directed to the upper scanning portion (e.g., 60%-70%) so the mirror portion 252 would be a larger arc (216°-252°) than the void portion (144°-108°).
Though the previous embodiments illustrate a single polygon mirror for the optical scanning element or mechanism, other configurations may be employed such as for example a rotating optical polygon of any suitable number of facet mirrors, a rotating holographic disk, a pair of rotating single facet mirrors, and a pair of pivoting single facet mirrors, or any other suitable scanning mechanism. Some of these alternate designs will now be discussed.
The above described scanning and collecting configurations are but a few examples of suitable configurations. Following the disclosure herein, one skilled in the art may combine portions of some of the configurations with other of the configurations.
The scanning system may also be combined with a horizontal scanner.
Alternately, the scanning systems of
An alternate multiplanar scanner is illustrated in
Routing mirror(s) Array mirror Scan lines 584 588 611, 612, 613 583 586 614, 615, 616 583 588 617, 618, 619 582 586 620, 621, 622 580, 584 588 623, 624, 625 581, 582 586 626, 627, 628 Routing mirror Array mirror Scan lines 566 554 631, 632, 633 572 552 634, 635, 636 578 552 637, 638, 639 568 556 640, 641, 642 Routing mirror Array mirror Scan lines 564 560 651, 652, 653 562 558 654, 655, 656 576 552 657, 658, 659 574 552 660, 661, 662
Moreover, each of the lateral sides of an object being passed through the scan volume may be scanned by lines from more than one of the sets of scan lines. Assuming an orientation of the scanner 500 with the product being moved through the scan volume along the “Z” direction (shown in the X, Y, Z directions in
The separate collection optics permit the simultaneous scanning through the horizontal and vertical windows. Separate analog signal processors 710, 712 are provided for simultaneously processing the analog signals from the respective photodiodes. Each signal is then converted and processed in a digital processor 714, 716 and then input into the microprocessor 725 for final processing and transmittal to the point of sale system 730. Alternately, the signals from the analog signal processors 710, 712 may be routed to a single digital processor 720, multiplexed by a switching mechanism 713. Alternately, a combination of the above two embodiments may be used. Buffers (not shown) may be used in the above embodiments.
An integrated weigh scale may be incorporated into the horizontal housing portion 512. Such a system is preferably constructed with a concentric beam system which does not interfere with the placement of the horizontal window 525 at the center of a weighing platter. The signal from the scale electronics 740 may then be transmitted to the microprocessor 725 for processing and output to the POS system 730.
Thus, a scanning system and method for reading data have been shown and described. It is intended that any one of the disclosed outgoing light configurations may be combined with any one of the collecting configurations. Though certain examples and advantages have been disclosed, further advantages and modifications may become obvious to one skilled in the art from the disclosures herein. The invention therefore is not to be limited except in the spirit of the claims that follow.
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|Cooperative Classification||G06K7/10623, G06K7/1096, G06K7/10871, G06K7/10772, G06K7/10693, G06K7/10673, G06K7/10574|
|European Classification||G06K7/10S9E1, G06K7/10S9N, G06K7/10S2P2B2, G06K7/10S2B2, G06K7/10S2P4B, G06K7/10S4M2, G06K7/10S2P2H|
|Sep 15, 2006||AS||Assignment|
Owner name: SPECTRA-PHYSICS SCANNING SYSTEMS, INC., OREGON
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BOBBA, MOHAN L.;ACOSTA, JORGE L.;EUSTERMAN, TIMOTHY J.;AND OTHERS;REEL/FRAME:018258/0159;SIGNING DATES FROM 19940105 TO 19940418
|Sep 19, 2006||AS||Assignment|
Owner name: PSC SCANNING, INC., OREGON
Free format text: CHANGE OF NAME;ASSIGNOR:SPECTRA-PHYSICS SCANNING SYSTEMS, INC.;REEL/FRAME:018272/0774
Effective date: 19960909
|Mar 9, 2010||AS||Assignment|
Owner name: DATALOGIC SCANNING, INC.,OREGON
Free format text: CHANGE OF NAME;ASSIGNOR:PSC SCANNING, INC.;REEL/FRAME:024045/0523
Effective date: 20070326
Owner name: DATALOGIC SCANNING, INC., OREGON
Free format text: CHANGE OF NAME;ASSIGNOR:PSC SCANNING, INC.;REEL/FRAME:024045/0523
Effective date: 20070326