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:
Aug. 01, 1989
Filed:
Jun. 23, 1988
Hirohisa Miyamoto, Osaka, JP;
Yasuyuki Matsuuchi, Osaka, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
An illuminating device for image exposure in an electrophotographic copying machine, which employs a fluorescent lamp whose voltage is variable as an illumination source and has signals to indicate when the copying machine is ready to make copies and to tell when the light amount for illumination is insufficient after preliminary lighting being performed for a fixed amount of time. A temperature sensor to detect tube wall temperature of the fluorescent lamp and a light sensor to detect the amount of light emitted from the lamp installed in the device to permit the preliminary lighting of the fluorescent lamp to be carried out at an appropriate voltage. Therefore, clear copies are readily made soon after the power of the copying machine is turned on, and, electric power waste and/or serious troubles of the machine which may occur by further use as well as exhaustion of the lamp by unnecessary high voltages can be avoided.