Title:
WEDGED-SHAPE HOLOGRAPHIC COLLECTOR
Document Type and Number:
WIPO Patent Application WO2000072231
Kind Code:
A3
Abstract:
A diffractive collector for an optical scanner includes a wedged-shaped substrate having holographic grating provided on a front surface, a conical-shaped back surface, and at least one detector. Substantially parallel light is made incident upon the front surface of the substrate, and the light is diffracted within the substrate to the back surface. The wedged shaped of the collector and the holographic grating cause the light to reflect back within the substrate at such an angle that the light remains within the substrate as the light propagates to the at least one detector.
Inventors:
WHITCOMB KEVIN J
MCMASTER BRIAN J
SHEARIN ALAN
DEAN ANNA M
MCMASTER BRIAN J
SHEARIN ALAN
DEAN ANNA M
Application Number:
PCT/US2000/008228
Publication Date:
April 19, 2001
Filing Date:
May 18, 2000
Export Citation:
Assignee:
PSC SCANNING INC (US)
International Classes:
G02B26/12; G06K7/10; G02B6/00; G02B6/42; (IPC1-7): G06K7/10; G02B6/16; G02B6/42; G02B26/10; G02B27/44; H04N1/028
Domestic Patent References:
| WO1999056234A1 | 1999-11-04 | |||
| WO1996011450A1 | 1996-04-18 |
Foreign References:
| US3763372A | 1973-10-02 | |||
| US5680257A | 1997-10-21 | |||
| US5268985A | 1993-12-07 | |||
| US4886341A | 1989-12-12 | |||
| EP0464284A2 | 1992-01-08 | |||
| US5786585A | 1998-07-28 |
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