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:
Nov. 08, 1988
Filed:
May. 04, 1987
Akira Yokota, Sagamihara, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
In order to make it possible to observe the image of an object as an erect (correct) image and also to construct the entire device in a compact size, the optical system for altering the direction of the visual field for use in endoscopes comprises visual field direction altering means composed of the combination of a first prism having a light-incidence surface normal to the optical axis of the incident light and a second prism having a light-emitting surface normal to the optical axis of the optical system located rearwardly of the first prism, and arranged so that the vertical angle between the light-incidence surface and the light-emitting surface of the first prism and the vertical angle between the light-incidence surface and the reflection surface of the second prism are structured, respectively, to satisfy certain specific conditions. This visual field direction altering optical system can be constructed as an adapter removably mounted to the foremost end portion of the endoscope.