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. 28, 1982
Filed:
Mar. 30, 1979
Nagashige Takahashi, Tokyo, JP;
Shinichi Harada, Urawa, JP;
Kabushiki Kaisha Medos Kenkyusho, Tokyo, JP;
Abstract
An illumination device for photographing a portion of the body cavity to be examined with an endoscope having a light source using a discharge tube circuit for illuminating the portion to be examined and a mechanical shutter arranged in the optical path of illuminating light from the light source. A light quantity detecting circuit detects information on the brightness of illumination of the light source and a correct exposure time setting circuit together a correct exposure time estimating circuit receive the output from the light quantity detecting circuit. The closure of the mechanical shutter is controlled by the control operations of the correct exposure time setting circuit and correct exposure time estimating circuit. The discharge tube circuit comprises a time constant circuit, a relay circuit and a high voltage circuit. The high voltage circuit is controlled by the relay circuit to intermittently apply a voltage to start discharge until ignition takes place.