Bar code reading optical apparatus

Details Bar code reading optical apparatus Bar code reading optical apparatus

1997-02-26

1999-05-04

Pitts, Harold I.

Registers

Coded record sensors

Particular sensor structure

23546235, G06K 710

Patent

active

059006129

ABSTRACT:
In a bar code reading optical apparatus including a semiconductor laser and a prism both mounted on a photodiode IC so that emitted light from a semiconductor laser is reflected by a reflective plane of a prism and signal light from a bar code to be read out enters in and detected by a photodiode, a numerical aperture conversion hologram is provided in a light path of the emitted light reflected by the reflective plane of the prism to adjust the numerical aperture of a converging lens so that the numerical aperture for the emitted light be smaller than the numerical aperture for the signal light. The numerical aperture conversion hologram may be omitted by shaping the reflective plane of the prism into a concave plane to adjust the numerical value for the emitted light smaller than the numerical value for the signal light.

REFERENCES:
patent: 5481095 (1996-01-01), Mitsuda et al.

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