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:
Sep. 23, 1997
Filed:
Oct. 30, 1995
Nobuyuki Haji, Osaka, JP;
Moriaki Kawasaki, Habikino, JP;
Tamotsu Ikeda, Toyonaka, JP;
Masayoshi Ueda, Ashiya, JP;
Matsushita Electric Industrial Co., Ltd., Osaka-fu, JP;
Abstract
A photosensor arranged at the center of a light-receiving end of an optical fiber bundle detects an optical intensity which is converted by a photoelectric converter to an electric signal. Then, the optical energy provided at the optical fiber bundle is calculated based on the signal. On the other hand, a correction coefficient is calculated from optical intensity signals when the lamp is new and when the element in the lamp wears, and the setting value of the output optical intensity of the optical fiber bundle is corrected. Then, the current supplied to the lamp by a power supply is controlled according to a difference between the setting value and the measured optical energy. Thus, the optical energy to be received through the optical fiber bundle is controlled stably irrespective of the change of optical intensity distribution due to wear of the electrode of the lamp. Similarly, the correction coefficient is calculated from optical intensities measured with photodetectors arranged at and off the center of a light-receiving end of an optical fiber bundle.