Optical scanner with mirror mounted occluding aperture or filter

Details Optical scanner with mirror mounted occluding aperture or filter Optical scanner with mirror mounted occluding aperture or filter

1990-01-25

1991-05-28

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250237R, 358497, H01J 4014

Patent

active

050197037

ABSTRACT:
An optical scanner device for producing machine-readable data representative of an image of a scan line object, comprising: a light source for illuminating the scan line object; a lens assembly for focusing imaging light received from the scan line object on an image plane; at least one mirror having a planar mirror surface for reflectively directing imaging light from the scan line object into the lens assembly whereby a folded imaging light path extending between the scan line object and the lens assembly is provided; and an occluding aperture stop positioned in immediately adjacent, overlying relationship with the mirror surface for selectively differentially blocking light in the light path emanating from different points across the scan line object for adjusting the light intensity of the image produced on the image plane whereby blocking of light with the occluding aperture stop at more than one location along the folded imaging light path is obviated. Alternative embodiments utilizing a gradient filter and a shaped mirror surface are also disclosed.

REFERENCES:
patent: 4547663 (1985-10-01), Kitagishi et al.
patent: 4547813 (1985-10-01), McGraw et al.
patent: 4709144 (1987-11-01), Vincent
patent: 4725729 (1988-02-01), Morizumi
patent: 4839514 (1989-06-01), Mine et al.
patent: 4870268 (1989-09-01), Vincent et al.
PC World, May 1988, pp. 154 and 155.

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