Image density detecting device for image forming apparatus

Details Image density detecting device for image forming apparatus Image density detecting device for image forming apparatus

1982-05-19

1984-09-18

Truhe, J. V.

Photocopying

Including fiber optics

355 3R, 355 68, G03G 2700

Patent

active

044720467

ABSTRACT:
An image density detecting device for an image forming apparatus includes a substantially rectangular diffusing member for receiving light from document through a focusing light-transmission member and a plurality of photodiodes embedded at a suitable interval in the bottom of the light diffusing member. The longitudinal dimension of the light receiving surface mentioned above has a longitudinal dimension equal to the width of a document set on a table and a transversal dimension corresponding to an area of the document surface illuminated by an exposure lamp. Light reflected from the document illuminated by the exposure lamp is uniformalized through the light diffusing member before it is detected by the photodiodes.

REFERENCES:
patent: 3775009 (1973-11-01), Collins

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