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:
May. 21, 1991
Filed:
Jun. 08, 1989
Masahiko Sasaki, Hachioji, JP;
Tadashi Kato, Hachioji, JP;
Hiroyoshi Fujimori, Hachioji, JP;
Tatsuo Nagasaki, Musashino, JP;
Fumiyuki Onoda, Tokyo, JP;
Toshiaki Nishikori, Sagamihara, JP;
Hideo Tomabechi, Higashiyamato, JP;
Kazutake Sugawara, Hachioji, JP;
Kazuo Nakamura, Hachioji, JP;
Ootaro Ando, Hino, JP;
Koichi Karaki, Hino, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
An electronic endoscope having a light emitting unit for emitting illuminating light from the tip of the insertable part, a solid state imaging device at the tip for receiving an illuminated light image, a sample-holding circuit for sample-holding an output signal from the solid state imaging device, a light source for such light emitting unit and an iris device in such light source, the iris device comprising a diaphragm device for preventing the spectral characteristics of the endoscope from being changed due to the amount of light reduction which consists of a diaphragm assembly consisting of two dimensionally diaphragm units which consists of light passing openings with small sectional area and light shading parts formed by tubular surfaces surrounding the side surfaces of the openings, positioned in the beam emitted from illuminating lamp, and provided with means for turning diaphragm assembly from a position where the tubular surfaces are in parallel with the axis of the illumination beam to a position where the axes are at an angle.