Photodetector

Details Photodetector Photodetector

1984-07-30

1986-05-27

Pitts, Harold I.

Registers

Coded record sensors

Particular sensor structure

235472, G06K 710

Patent

active

045917060

ABSTRACT:
A photodetector and light source assembly useful in a bar-code reading system comprises a semiconductor substrate with holes therein. A light source form of LED's mounted on one side of the substrate corresponding with the respective holes illuminates an object plane, via a lens system, on the other side of the substrate. Preferably, the light received by the photodetector is slightly out of focus. Advantages include a saving in cost and size together with an improved depth of field and efficiency of illumination.

REFERENCES:
patent: 4376483 (1983-01-01), Takahisha

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