Patent
1987-05-04
1988-11-08
Corbin, John K.
350286, G02B 2302
Patent
active
047831561
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.
REFERENCES:
patent: 4138192 (1979-02-01), Yamasita
patent: 4398811 (1983-08-01), Nishioka et al.
Corbin John K.
Gass Rebecca D.
Olympus Optical Co,. Ltd.
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