The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 1995
Filed:
Aug. 30, 1993
Masaru Ushio, Hachioji, JP;
Junji Sato, Hachioji, JP;
Kazuhisa Maruyama, Hachioji, JP;
Kazuhiro Nakazawa, Hachioji, JP;
Konica Corporation, , JP;
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.