Image forming apparatus having function for controlling shutter

Details Image forming apparatus having function for controlling shutter Image forming apparatus having function for controlling shutter

1988-06-29

1991-02-05

Hix, L. T.

Photocopying

Projection printing and copying cameras

Identifying, composing, or selecting

355 74, 355244, G03B 2752

Patent

active

049909517

ABSTRACT:
In an image forming apparatus such as an image reader printer according to the present invention, light is radiated onto an original image by a light source, and a projection image corresponding to the irradiated original image is displayed on a projection screen. Cursors for designating a predetermined region of the projection image corresponding to the predetermined region of the original image are slidably displayed. When the original image is to be copied, the original image irradiated with the radiation light from the light source is optically scanned by a pivot mirror, and the scanning light is shielded by a shutter of a shutter unit only for a predetermined period of time corresponding to the predetermined region designated by the cursors. The shutter is controlled by a controller in accordance with the count of pulse signals generated by a generator that generates the pulse signals having a predetermined period, and shields the scanning light. Upon reception of the scanning light, and an image corresponding to the original image only within the designated region is formed on paper by an image forming unit comprising a photoconductive drum, a developing system, and the like.

REFERENCES:
patent: 4340295 (1982-07-01), Nakamura
patent: 4512657 (1985-04-01), Sakato
patent: 4693596 (1987-09-01), Shigaki
patent: 4708464 (1987-11-01), Otsuki et al.
patent: 4724464 (1988-02-01), Umeda et al.
patent: 4786945 (1988-11-01), Sambayashi
patent: 4821067 (1989-04-01), Oushiden et al.
patent: 4835576 (1989-05-01), Komori et al.

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