公开(公告)号：JPS63175821A

公开(公告)日：1988-07-20

申请号：JP26296387

申请日：1987-10-20

Applicant: IBM

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

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

公开(公告)号：DE3563660D1

公开(公告)日：1988-08-11

申请号：DE3563660

申请日：1985-01-02

Applicant: IBM

Inventor： BROOCKMAN ERIC CHARLES ,  FORTENBERRY ROBERT SCOTT

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

Abstract: 57 An optical scanner is improved by securing beam directing holographic films (26, 28,32,34) to the transparent scanner window (20). The films alter the paths (12A) of beams at the window to provide scanning beams suitable for rear or side scanning of label-carrying products. A vertical scanning beam, which sweeps a path parallel to the window's leading edge (30), might be used to detect the approach of a product to be scanned.

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).