Optical information reading apparatus having dust-proof plate

Details Optical information reading apparatus having dust-proof plate Optical information reading apparatus having dust-proof plate

1998-10-21

2000-03-21

Le, Thien M.

Registers

Coded record sensors

Particular sensor structure

23547201, G06K 710

Patent

active

060392568

ABSTRACT:
A dust-proof plate transmits light emitted by red light emitting diode unit. When the dust-proof plate reflects a part of the light, the reflected light incident on an image forming optical system becomes an optical noise in reading the image information of a reading object. In order to prevent the optical noise from being generated, an incident-side opening of a lens barrel is positioned proximately to the dust-proof plate. Thus, the light reflected from the dust-proof plate can be prevented from being introduced into the lens barrel.

REFERENCES:
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patent: 4621189 (1986-11-01), Kumar et al.
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patent: 4916441 (1990-04-01), Gombrich
patent: 4983818 (1991-01-01), Knowles
patent: 5059778 (1991-10-01), Zouzoulas et al.
patent: 5241488 (1993-08-01), Chadima, Jr. et al.
patent: 5324925 (1994-06-01), Koeneck et al.
patent: 5471042 (1995-11-01), Kirkeby et al.

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