Registers – Coded record sensors – Particular sensor structure
Patent
1997-10-27
2000-06-20
Le, Thien Minh
Registers
Coded record sensors
Particular sensor structure
23546201, G06K 710
Patent
active
060767367
ABSTRACT:
A holographic laser scanning system for scanning bar code symbols and the like, comprising: a holographic scanning disc; a plurality of laser beam sources; a plurality of beam folding mirrors adjacent the holographic scanning disc; a plurality of light focusing elements disposed beneath the holographic scanning disc; and plurality of photodetectors disposed above the holographic scanning disc. The light focusisng elements below the holographic scanning disc focus reflected laser light collected through the elements of the holographic scanning disc and retransmit the same therethrough off Bragg for direct detection by the photodetectors which are proximately dispposed to and above the holographic scanning disc. Several important advantages are obtained by providing light collection optics disposed below the holographic scanning disc, and retransmitting focused/collected laser light through the holographic scanning disc at an angle substantially off a Bragg angle of about 44 degrees. In particular, it is now possible to design and construct holographic laser scanners employing miultiple laser scanning stations within compact scanner housings having minimized height dimensions, while avoiding interference among the multiple outgoing, incoming and retransmitted laser beams generated within the scanner housing during laser scanning and light collection operations.
REFERENCES:
patent: 4416505 (1983-11-01), Dickson
patent: 5680232 (1997-10-01), Iwamatsu et al.
"Low-Profile Holographic Bar Code Scanner," IBM Corporation Technical Disclosure Bulletin, vol. 31, No. 12, May 1989, pp. 205-206.
Amundsen Thomas
Dickson LeRoy
Groot John
Knowles Carl Harry
Le Thien Minh
Metrologic Instruments Inc.
Perkowski, Esq., P.C. Thomas J.
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