公开(公告)号：DE3782043T2

公开(公告)日：1993-04-15

申请号：DE3782043

申请日：1987-12-11

Applicant: IBM

Inventor： BLOCK TIMOTHY ROY ,  HEILING GERALD MICHAEL ,  KARST DENNIS LEON ,  KOBLISKA DAVID CARL ,  LU TONG ,  SODERSTROM RONALD LEE

IPC: G02B6/34 ,  G02B6/42 ,  G02B27/00 ,  G02B27/28

公开(公告)号：DE3770384D1

公开(公告)日：1991-07-04

申请号：DE3770384

申请日：1987-07-31

Applicant: IBM

Inventor： BLOCK TIMOTHY ROY ,  ENSTROM MARK RICHARD ,  LUECKE FRANCIS STEPHEN ,  SHIDLER KARL ALLEN ,  SODERSTROM RONALD LEE

IPC: G11B7/085 ,  G01B9/02 ,  G11B5/55 ,  G11B21/08

Abstract: In this system the light reflected back over the path (10a) to be measured is fed directly into a semiconductor laser (8a). As is commonly known, the introduction of reflected power through the front, or emitting, facet of the laser actually alters the power present in the laser with an attendant effect on the signal from a photosensor (15) usually located on the rear facet of the laser. The output signal from the photosensor associated with the laser has an asymmetric sawtooth (triangular) waveform. This is in contrast to the output signal from a conventional interferometer which has a sinusoidal waveform. The photosensor output signal is profoundly affected by the return beam. Also unexpectedly, the sawtooth output signal from the photosensor is an essentially linear signal over the range between adjacent fringes. That is, except for the transition at positive and negative peaks. As the path length (10a) of the reflected beam is increased or decreased, the sawtooth output signal changes in a direct linear relationship to the change in path length. This allows precise measurement of changes in distance less than the distance between adjacent fringes.

公开(公告)号：DE2431973B2

公开(公告)日：1976-09-16

申请号：DE2431973

申请日：1974-07-03

Applicant: IBM

Inventor： BOWEN ARLEN JOHN ,  DICKSON LEROY DAVID ,  GORETZKI JEROME ARNOLD ,  HENDRICKSON KENNETH EARL ,  KING DONALD PAUL ,  KUEPER TERRANCE WAYNE ,  SODERSTROM RONALD LEE

IPC: G02B26/10 ,  G06K7/10 ,  G06K7/14

Abstract: An omnidirectional optical scanner scans bar coded labels passed relative to a rectangular scan window with a plurality of interlaced X's whereby the labels are completely scanned irrespective of their orientation.