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:
Dec. 08, 1987
Filed:
Jul. 02, 1986
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
In an original illumination device with an automatic illumination control according to the present invention, light from an exposure lamp (6) illuminates an original (1) and a reference density plate provided on the lower surface of a table (2), reflected light from the original (1) is directed to a photosensitive drum (13), and reflected light from the original (1) and the reference density plate (3) is detected by a photo detector (14), whereby an MPU (17) controls power supply to the exposure lamp (6) by an exposure lamp regulator (19) based on the detection output of the photo detector (14). In addition, in case where a prescribed triggering signal is inputted to the exposure lamp regulator (19) and the photo detector (14) does not detect light, the MPU (17) determines that the exposure lamp (6) is broken, while in case where the prescribed triggering signal is not inputted to the exposure lamp regulator (19) and the photo detector (14) detects light, the MPU (17) determines that it is an abnormal lighting condition. Accordingly, the abnormal condition of the light source can be easily determined by a simple structure.