Optical information reading apparatus having defocus function fo

Details Optical information reading apparatus having defocus function fo Optical information reading apparatus having defocus function fo

1996-07-25

1998-09-22

Hajec, Donald T.

Registers

Coded record sensors

Particular sensor structure

235454, 235472, 235470, 359739, G06K 710

Patent

active

058117784

ABSTRACT:
Distance L between best focus surface BF to reading opening 22 is in a range satisfying the condition: 2 mm.ltoreq..vertline.L.vertline..ltoreq.2a.multidot..omega./D, where "D" represents the size of a short side of an elongated hole of a diaphragm 34a, "a" represents a distance from an objective-side principal point of an imaging lens 34 to the best focus surface BF, ".omega." represents a minimum width of a module of bar code 8, "L" represents a distance measured from the best focus surface BF toward imaging lens 34, and .vertline.L.vertline. represents an absolute value of distance L. With this arrangement, adverse effect of stains, wounds and scratches of bar code 8 can be averaged or decentralized along the longitudinal direction of the bar of bar code 8 without deteriorating a reading accuracy in the lateral direction.

REFERENCES:
patent: 4408120 (1983-10-01), Hara et al.
patent: 4538060 (1985-08-01), Sakai et al.
patent: 4818847 (1989-04-01), Hara et al.
patent: 4874933 (1989-10-01), Sanner
patent: 5151580 (1992-09-01), Metlitsky et al.
patent: 5418356 (1995-05-01), Takano
patent: 5449892 (1995-09-01), Yamada
patent: 5504317 (1996-04-01), Takakashi
patent: 5552592 (1996-09-01), Dvorkis et al.
patent: 5648877 (1997-07-01), Schnitzlein
Concise English Explanation of Japanese Prior Art Document No. SHO-235277, Nov. 21, 1985.

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