Flat bed scanning type image reader

Details Flat bed scanning type image reader Flat bed scanning type image reader

1990-05-29

1992-07-21

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 124

Patent

active

051328100

ABSTRACT:
An image reader includes a half mirror or the like disposed in an optical path extending from an input optical system to a CCD line sensor, and a linear light source disposed in an optical path branched out by the half mirror. The linear light source is located at a position equivalent to the CCD line sensor with respect to a document table, and is equal in length to an effective pixel region of the CCD line sensor. Light emitted from the light source is projected back to the document table. An effective image reading area is displayed on the document table by relatively moving the document table and linear projected image in a sub-scanning direction. The linear light source is rotatable in accordance with a desired setting angle of an original. Consequently, an inclined image is projected back to the document table to serve as a guideline for setting the angle of the original. Where a spot light source is substituted for the linear light source, a spot image projected back to the document table is moved along a trimming area of an original. The trimming area is automatically determined by detecting distances of movement of the spot image.

REFERENCES:
patent: 4386374 (1983-05-01), Kimoto
patent: 4922351 (1990-05-01), Suzuki et al.
patent: 5053889 (1991-10-01), Nakano et al.

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