Registers – Coded record sensors – Particular sensor structure
Patent
1992-10-02
1994-09-20
Pitts, Harold
Registers
Coded record sensors
Particular sensor structure
235462, G06K 710
Patent
active
053491726
ABSTRACT:
The optical scanning head includes at least one trio of light emitting diodes arranged so the LEDs emit light at different angles to create a fan of light. An optical module includes a light shield or "dark room" and a lens/filter assembly which provides control of the depth of focus of the scanner. The optical module is located behind the light source, and the detector, made up of a CCD array is mounted behind the optic module for detecting the light intensity in the reflected beam over a field of view across a bar code symbol. The CCD array generates an electrical signal indicative of the detected light intensity. A DC source or battery provides DC voltage to the LEDs and CCDs in response to a clocked signal which provides a gradual or sequential illumination of the LEDs and coordinates the activation of the CCDs in order to minimize power consumption during scans.
REFERENCES:
patent: 4306147 (1981-12-01), Fukuyama
patent: 4570057 (1986-02-01), Chadima, Jr. et al.
patent: 4818847 (1989-04-01), Hara et al.
patent: 4900907 (1990-02-01), Matusima et al.
patent: 5010241 (1991-04-01), Butterworth
patent: 5073954 (1991-12-01), Van Tyne et al.
patent: 5135160 (1992-08-01), Tasaki
Data Sheet: CCD Bar Code Scanner; ZB-1000/2000 Plus Series, Zebex Industries, Inc., 1992 Zebex Catalog No. 920802.
Data Sheet: CCD Bar Code Handy Scanner Model BHS-6000 Series; Nippondenso Co., Ltd., Mar. 1992.
Advertisement: "Get a Head with Denso's Reading Edge Technology". ID Systems, Apr. 1987, vol. 7, No. 3.
"Information Encoding with Two-Dimensional Bar Codes", Theo Pavlidis, et al., Computer, vol. 25, No. 6, Jun. 1992, pp. 18-28.
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