Image forming apparatus capable of detecting original-image dens

Details Image forming apparatus capable of detecting original-image dens Image forming apparatus capable of detecting original-image dens

1987-09-25

1989-03-07

Hix, L. T.

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 71, G03B 2772

Patent

active

048110566

ABSTRACT:
Light beam radiated from an exposure light source of a copying machine is reflected by a predetermined portion of an original. First reflected light beam of reflected light passing through a SELFOC lens is radiated on the surface of a photosensitive body to form an electrostatic latent image thereon. An original image density detecting device is provided next to the SELFOC lens and includes a housing having a slit formed in its upper wall along the axial direction of the photosensitive body, a reflecting plate, provided on an inner bottom wall surface of the housing, and having an aluminum tape adhered on its surface, and a photosensor mounted on an inner upper wall surface of the housing. Of the light beams reflected by the original, second reflected light beam reflected near the SELFOC lens and not passing therethrough is incident into the housing from the slit and reaches the reflecting plate. Third reflected light beam reflected on the surface of the reflecting plate is received by the photosensor, and the photosensor detects the original-image density.

REFERENCES:
patent: 4231657 (1980-11-01), Iwatnatsu
patent: 4321630 (1982-03-01), Kramer
patent: 4371897 (1983-02-01), Kramer
patent: 4465358 (1984-08-01), Miura
patent: 4544258 (1985-10-01), Takano

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