Optical member, observation apparatus with the optical member, a

Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type

Patent

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A61B 310

Patent

active

061391514

ABSTRACT:
Disclosed is an optical member for splitting or combining luminous flux, the optical member including a base body made of a transparent material originally having an internal transmittance of approximately 100%. The base body includes a colored portion which is formed in an entire interior of the base body or on at least one of a light entrance plane and a light exit plane of the base body, whereby the internal transmittance of the optical member is reduced when the luminous flux to be used for observation and examination is split or combined by the optical member. Accordingly, the optical member can reduce the generation of ghost images caused by reflection of the luminous flux by a back plane of the optical member. Also disclosed are an observation apparatus and an examination apparatus for observing or examining an object by means of the luminous flux split or combined by the above optical member.

REFERENCES:
patent: 5629748 (1997-05-01), Hayashi et al.
patent: 5742374 (1998-04-01), Nanjo et al.
patent: 5844659 (1998-12-01), Isogai
patent: 5886823 (1999-03-01), Sugano
patent: 5894357 (1999-04-01), Murakami
patent: 5999320 (1999-12-01), Shirasaki

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