Mirror smudge detecting apparatus for an image forming apparatus

Details Mirror smudge detecting apparatus for an image forming apparatus Mirror smudge detecting apparatus for an image forming apparatus

1993-08-30

1995-06-13

Sikes, William L.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250214AG, G01J 132

Patent

active

054235120

ABSTRACT:
A mirror smudge detecting apparatus for detecting a smudge on a mirror member used in an image forming apparatus such as a copier. The apparatus includes a platen glass for supporting a document; a reference density panel having a reference density on the surface; an illumination lamp for irradiating the document at the platen glass and the reference density panel with a light beam; a sensor for detecting a reflection of the light beam from the document and the reference density member so that a document density signal, corresponding to a density of the document, and a reference density signal, corresponding to the reference density, are obtained; the mirror member, located in a path of the light beam between the illumination lamp and the sensor, for reflecting the light beam from the document and the reference density panel; the first output processing circuit for processing the reference density signal to obtain an irradiation controlling signal; a control circuit for controlling the illumination lamp according to the irradiation controlling signal; and the second output processing circuit for processing the reference density signal to obtain a mirror smudge detecting signal. In the apparatus, a dynamic range of the second output processing circuit is broader at a high reflection ratio side than a dynamic range of the first output processing circuit.

REFERENCES:
patent: 4687919 (1994-08-01), Nagano

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