Multi-focus optical device

Details Multi-focus optical device Multi-focus optical device

1992-09-21

1996-02-27

Shepperd, John

Registers

Coded record sensors

Particular sensor structure

G06K 710

Patent

active

054950961

ABSTRACT:
A multi-focus optical sensing device for use in bar code scanners, photoelectric sensors and the like is disclosed. To extend the range of detection along the optical axis, without increasing the detection time, the focal point of the light beam is caused to move along the optical axis. A control and modulation circuit varies a current I.sub.f which drives an optical semiconductor serving as a light source. This changes the focal distance of a refraction lattice and so causes the focal position of the light beam emitted by light source to scan along the optical axis. This scan is repeated each time a polygonal mirror scans the light beam over the narrowest width 1
(where n is an integer) of the bar code lines. A processing unit samples and processes the signal from a photodetector unit while the light beam is being scanned along the optical axis.

REFERENCES:
patent: 4733943 (1988-03-01), Suzuki et al.
patent: 4818847 (1989-04-01), Hara et al.
patent: 5019698 (1991-05-01), Eastman
patent: 5187353 (1993-02-01), Metlitski et al.
patent: 5212501 (1993-05-01), Nakamura et al.
IBM Technical Disclosure Bulletin, vol. 15 No. 1 Jun. 1972.

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