公开(公告)号：DE69317743T2

公开(公告)日：1998-10-29

申请号：DE69317743

申请日：1993-11-29

Applicant: IBM

Inventor： DICKSON LEROY DAVID ,  RALLISON RICHARD DENNIS

IPC: G03H1/26 ,  G02B5/30 ,  G02B5/32 ,  G03H1/00

Abstract: A hologram system 10 is comprised of two identical volume holograms 14,18. Both holograms have Bragg planes oriented perpendicular to the surface of the hologram. The first volume hologram 14 separates a single beam 32 into two orthogonal polarization component beams 34,36. The second volume hologram 18 diffracts one of the polarization component beams 34 such that a desired separation angle SA is achieved between the two beams 34,36. This separation angle SA may be precisely adjusted during manufacture by orienting the Bragg planes of the second volume hologram 18 at a rotational angle with respect to the Bragg planes of the first volume hologram 14.

公开(公告)号：AT164687T

公开(公告)日：1998-04-15

申请号：AT93309486

申请日：1993-11-29

Applicant: IBM

Inventor： DICKSON LEROY DAVID ,  RALLISON RICHARD DENNIS

IPC: G03H1/26 ,  G02B5/30 ,  G02B5/32 ,  G03H1/00

Abstract: A hologram system 10 is comprised of two identical volume holograms 14,18. Both holograms have Bragg planes oriented perpendicular to the surface of the hologram. The first volume hologram 14 separates a single beam 32 into two orthogonal polarization component beams 34,36. The second volume hologram 18 diffracts one of the polarization component beams 34 such that a desired separation angle SA is achieved between the two beams 34,36. This separation angle SA may be precisely adjusted during manufacture by orienting the Bragg planes of the second volume hologram 18 at a rotational angle with respect to the Bragg planes of the first volume hologram 14.

公开(公告)号：DE69118291T2

公开(公告)日：1996-10-10

申请号：DE69118291

申请日：1991-09-05

Applicant: IBM

Inventor： LUECKE FRANCIS STEPHEN ,  DICKSON LEROY DAVID

IPC: G11B7/004 ,  G11B7/09 ,  G11B7/125 ,  G11B7/13 ,  G11B7/135 ,  G11B7/14 ,  G11B11/105

公开(公告)号：DE3688890T2

公开(公告)日：1994-03-17

申请号：DE3688890

申请日：1986-03-11

Applicant: IBM

Inventor： ANTONELLI DOUGLAS CHARLES ,  BRANSCOMB PATRICIA ,  BROOCKMAN ERIC CHARLES ,  DICKSON LEROY DAVID ,  KOPPEL CARALEE ,  OSSOWSKI RICHARD ,  STOKES OLEN LEE

IPC: G06K7/016 ,  G06K7/10

Abstract: A system is disclosed for preventing processing of duplicative coded label signals generated by a scanner lacking item detectors. The system establishes a variable lockout time as a function of operator performance. Any detected label candidate which duplicates a candidate received within the lockout time is assumed to be duplicative. Any transfer to the terminal is inhibited. Operator performance is tracked by measuring the inter-item arrival times for candidates actually transferred to the terminal. The inter-item arrival times are averaged over a given number of items. The average value is used to select a lockout time which is generally proportional to the average inter-item arrival time.

公开(公告)号：DE3272331D1

公开(公告)日：1986-09-04

申请号：DE3272331

申请日：1982-09-22

Applicant: IBM

Inventor： DICKSON LEROY DAVID

IPC: G02B5/32 ,  G02B26/10 ,  G03H1/04 ,  G03H1/20

Abstract: Production quantities of a multi-element holographic scanner disc are made by optically replicating a silver halide master disc one element at a time in a dichromated gelatin film. The dichromated gelatin film swells during processing. The swell is monitored during production by determining the shift in the angle of the Bragg surfaces within the gel. The angle of the replicating beam for each element is changed from that of the original reference beam to establish a Bragg angle at exposure which will be tilted to the proper angle after swelling in order to maximize the diffraction efficiency of the element at the original reference beam angle.

公开(公告)号：DE69317743D1

公开(公告)日：1998-05-07

申请号：DE69317743

申请日：1993-11-29

Applicant: IBM

Inventor： DICKSON LEROY DAVID ,  RALLISON RICHARD DENNIS

IPC: G03H1/26 ,  G02B5/30 ,  G02B5/32 ,  G03H1/00

Abstract: A hologram system 10 is comprised of two identical volume holograms 14,18. Both holograms have Bragg planes oriented perpendicular to the surface of the hologram. The first volume hologram 14 separates a single beam 32 into two orthogonal polarization component beams 34,36. The second volume hologram 18 diffracts one of the polarization component beams 34 such that a desired separation angle SA is achieved between the two beams 34,36. This separation angle SA may be precisely adjusted during manufacture by orienting the Bragg planes of the second volume hologram 18 at a rotational angle with respect to the Bragg planes of the first volume hologram 14.

公开(公告)号：DE3787570D1

公开(公告)日：1993-11-04

申请号：DE3787570

申请日：1987-04-16

Applicant: IBM

Inventor： DICKSON LEROY DAVID

IPC: G02B26/10 ,  G06K7/015 ,  G06K7/10 ,  G06K7/12

公开(公告)号：DE3782593T2

公开(公告)日：1993-05-13

申请号：DE3782593

申请日：1987-07-14

Applicant: IBM

Inventor： DICKSON LEROY DAVID

IPC: G02B5/32 ,  G02B26/10 ,  G03H1/20

Abstract: A multi-faceted holographic disk can be copied in a one-step process by using a source disk (18), actually a sandwich of two thin film layers (28, 44) of photosensitive material. The first thin film layer (28) is capable of producing multiple reference beams simultaneously. The second thin film layer (44) is a "master" copy of the disk to be copied. Both layers are produced using known off-axis holographic techniques. A target disk (20), having an unexposed film (54) of photosensitive material is located adjacent the second thin film layer (44). The source disk (18) is illuminated with coherent light (58), preferably in the form of a conical beam with an apparent point of origin on an axis through the common centers of the source and target disks.

公开(公告)号：DE3768249D1

公开(公告)日：1991-04-04

申请号：DE3768249

申请日：1987-12-23

Applicant: IBM

Inventor： CATO ROBERT THOMAS ,  DICKSON LEROY DAVID ,  FORTENBERRY ROBERT SCOTT

IPC: G06K7/12 ,  G02B26/10 ,  G06K7/10

Abstract: A holographic scanner includes a rotating glass disk (10) carrying a plurality of scan line generating holograms, a laser light source (14) and means (16) for detecting reflected optical energy. The scanner is improved by adding a plurality of relatively small position-indicating holograms (38) in alternation with the scan line generating holograms (36). The position-indicating holograms (38) redirect the laser beam along desired paths on the same side of the disk (10) as the laser (14). The redirected laser beam may be detected by the system photodetector (16) or an auxiliary photodetector to provide signals indicating the current disk position. The position information can be used by a system processor (34) to optimize scanner parameters as a function of the characteristics of the next active scan-line generating hologram (36).

公开(公告)号：DE3279329D1

公开(公告)日：1989-02-09

申请号：DE3279329

申请日：1982-10-26

Applicant: IBM

Inventor： DICKSON LEROY DAVID ,  PIERCE CHARLES MICHAEL ,  STOKES OLEN L ,  WOODLAND NORMAN JOSEPH

IPC: G06K7/016 ,  G06K7/10

Abstract: An optical scanner in a retail store checkout stand includes a single item detector (14, 16) upstream of the scanner window (12). Output signals from the item detector and from symbol recognition logic are used to open and closes a shutter (27) in the beam path of the scanner laser. The shutter is opened and a first time out sequence is started when the beam path is interrupted. A second, short time out sequence is restarted each time a valid symbol is recognized. A third time out sequence of intermediate length supersedes the first out sequence when the beam path is cleared. The laser shutter is closed and the symbol is transferred to a terminal (38) or controller upon the completion of any active time out sequence or upon recognition of a predetermined number of identical symbols, whichever comes first.