05354977 is referenced by 379 patents and cites 16 patents.

The optical scanning head for scanning one- and two-dimensional bar codes includes at least one combination of light emitting diodes arranged so the LEDs emit light at different angles to create a fan of light. The combination and arrangement of the LEDs depends on whether one- or two-dimensional bar codes are to be read. A cylindrical lens optimizes the light impinging upon the bar code. An optical module includes a light shield or "dark room" and a lens/filter assembly which focusses reflected light on the detector, made up of a CCD module for detecting the light intensity in the reflected beam over a field of view across a bar code symbol. One or more combinations of linear CCD arrays in the CCD module generate an electrical signal indicative of the detected light intensity. A trigger mechanism allows selection of the number of LEDs or linear CCD arrays to efficiently scan one- or two-dimensional bar codes, where two-dimensional bar codes require more illumination for accurate scanning.

Title
Optical scanning head
Application Number
843266
Publication Number
5354977
Application Date
October 23, 1992
Publication Date
October 11, 1994
Inventor
Alex Roustaei
1696 Via Inspirar, San Marcos, 92069
CA, US
Agent
Brown Martin Haller & McClain
IPC
G06K 7/10
View Original Source