Optical reader with reduced regular reflection errors

Details Optical reader with reduced regular reflection errors Optical reader with reduced regular reflection errors

1991-04-02

1992-03-24

Weinhardt, Robert

Registers

Coded record sensors

Particular sensor structure

235472, G06K 710, G06K 701

Patent

active

050991094

ABSTRACT:
An optical reader which has a light emitting element, a photodetector, a light emitting side lens for converging a light emitted from the light emitting element to a surface to be detected, and a photodetecting side lens for converging a light reflected on the surface to be detected to the photodetector, wherein the light emitting side focus point focused at the light emitting element by the light emitting side lens is set at a position separated from the lens farther than the photodetecting side focus point focused at the photodetector by the photodetecting side lens. Thus, the adverse influence of a regular reflection light can be prevented in a small-sized structure and a detecting accuracy can be enhanced without decreasing the light detecting efficiency of the optical reader.

REFERENCES:
patent: 2811081 (1957-10-01), Praeger
patent: 4143809 (1979-03-01), Uebbing et al.
patent: 4346292 (1982-08-01), Routt et al.
patent: 4528444 (1985-07-01), Hara et al.
patent: 4560862 (1985-12-01), Eastman et al.
patent: 4631397 (1986-12-01), Ohsato et al.
patent: 4675531 (1987-06-01), Clark et al.
patent: 4678288 (1987-07-01), Lonsdale et al.
patent: 4818886 (1989-04-01), Drucker
patent: 4843222 (1989-06-01), Hochgraf

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