Diffractive optical beam shaping methods and apparatus for provi

Details Diffractive optical beam shaping methods and apparatus for provi Diffractive optical beam shaping methods and apparatus for provi

1993-06-07

1995-01-31

Hajec, Donald

Registers

Coded record sensors

Particular sensor structure

359558, G06K 710

Patent

active

053861051

ABSTRACT:
In order to control laser beam propagation, working range and beam cross-section in a bar code scanner, diffractive optics are used to modify the amplitude and/or phase distribution of the beam in the scanner. The beam is diffracted by a mask which has a plurality of apertures in the form of segments which are arranged across the beam cross-section in the vicinity of a converging lens. The segments are sized and their transmission functions selected (one segment having for example 100% transmission and the other 50% transmission) such that bar codes close in and far out from the scanner are in regions of far field diffraction of different segments, or where such regions overlap, thereby extending the working range of the scanner where bar codes of high density can be resolved.

REFERENCES:
patent: 3523732 (1970-08-01), Mary
patent: 4510383 (1985-04-01), Ruffender
patent: 4560862 (1985-12-01), Eastman et al.
patent: 4603262 (1986-07-01), Eastman
patent: 4808804 (1989-02-01), Krichever et al.
patent: 4816660 (1989-03-01), Swartz et al.
patent: 4820911 (1989-04-01), Arackellian et al.
patent: 4831275 (1989-05-01), Drucker
patent: 4947413 (1990-08-01), Jewell et al.
patent: 5016981 (1991-05-01), Peppers et al.
patent: 5080456 (1992-01-01), Katz et al.
patent: 5111343 (1992-05-01), Harrigan
patent: 5121378 (1992-06-01), Hirose et al.
patent: 5200597 (1993-04-01), Eastman
patent: 5210398 (1993-05-01), Metlitsky
Advanced Technology in Laser Rased Hand Held Bar Code Scanners by J.7 Eastman Sam Quinn.
Optics & Photonics News, Sep. 1992, vol. 3 No. 9 pp. 25-32.

Affiliated with

Also associated with

Rating

Diffractive optical beam shaping methods and apparatus for provi does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Diffractive optical beam shaping methods and apparatus for provi, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Diffractive optical beam shaping methods and apparatus for provi will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1103980