Photocopying – Contact printing – Light boxes
Patent
1991-02-07
1992-04-21
Grimley, A. T.
Photocopying
Contact printing
Light boxes
355203, 355214, G03G 2100
Patent
active
051073021
ABSTRACT:
An image density control device for an image forming apparatus produces a sufficient output with no regard to the amount of toner deposition on an electrostatic latent image and, based on the output, performs adequate image density control. The amount of toner deposition is sensed by a plurality of reflection type optical sensors each having a light emitting and a light-sensitive element. The angle between the optical axes of the light emitting and light-sensitive elements differs from one sensor to another. The sensor having a large angle and the sensor having a small angle as defined between the optical axes are used to sense a areference density pattern having a relatively low density and a reference density pattern having a relatively high density, respectively. The plurality of optical sensors may be replaced with a single optical sensor which is actuated by a drive mechanism to change the angle between the optical axes in matching relation to the density of the reference density pattern.
REFERENCES:
patent: 4218144 (1980-08-01), Whitehouse et al.
patent: 4750140 (1988-06-01), Asano et al.
patent: 4796065 (1989-01-01), Kanbayashi
patent: 4803374 (1989-02-01), Monfort et al.
Grimley A. T.
Ramirez Nestor R.
Ricoh & Company, Ltd.
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