Optical device including multiple reflectors and optical systems

Details Optical device including multiple reflectors and optical systems Optical device including multiple reflectors and optical systems

1997-03-10

1999-07-20

Lee, Michael G.

Registers

Coded record sensors

Particular sensor structure

23546245, 23547201, 235457, 250237G, 2502086, 359563, 359572, G06K 710

Patent

active

059258675

ABSTRACT:
An optical device reads the information such as bar codes on an object. A light-emitting element emits a read-beam. A lens cover has an inclined surface that is at an angle with the read-beam and reflects the read-beam toward a bar code, the read-beam emerging as a reflected-beam after reflection from the surface of the bar code. The reflected-beam contains a component directly reflected from the bar code and a component randomly reflected by the white and black areas of the bar code. An optical system in the form of a lens is arranged between the lens cover and the light-emitting element, and converges the read-beam to the bar code. The inclined surface is also at an angle with the reflected-beam and reflects the reflected-beam toward a second optical system in the form of a lens which in turn converges the reflected-beam emerging from the inclined surface to a light-sensing element. The light-sensing element detects the reflected-beam. The inclination angle of the inclined surface may be selected such that more randomly reflected light is contained in the reflected-beam than the directly reflected light.

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