Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1994-05-18
1999-12-21
Pitts, Harold I.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
23547201, 23546235, G01N 2186
Patent
active
060052554
ABSTRACT:
A scanner has a window in its housing through which the scanning beam emerges to impinge upon an indicia to be read. The window is elongate, and adjacent each end, on the inside of the housing, there is a bar code symbol structure. In use, the scanning beam first scans across the symbol structure at one end of the window, then passes through the window to impinge upon the indicia, then scans across the second symbol structure at the other end of the window. Reflected light from the two code symbol structures and from the indicia, are received by a photodetector. The reflected light from the bar code symbol structures on the inside surface of the housing provides locating and timing information which enables the scanner to produce an accurate special reconstruction, in computer memory, of the indicia. In an alternative embodiment, the beam moves in a raster pattern, and there is a further locating/timing/synchronization bar code symbol structure adjacent a long edge of the window. At least one of the raster lines passes over this bar code symbol structure, thereby obtaining further locating and timing information.
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Pitts Harold I.
Symbol Technologies Inc.
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