Optics: eye examining – vision testing and correcting – Eye examining or testing instrument – Objective type
Patent
1999-09-27
2000-10-31
Manuel, George
Optics: eye examining, vision testing and correcting
Eye examining or testing instrument
Objective type
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.
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patent: 5844659 (1998-12-01), Isogai
patent: 5886823 (1999-03-01), Sugano
patent: 5894357 (1999-04-01), Murakami
patent: 5999320 (1999-12-01), Shirasaki
Ota Manabu
Ueno Tokio
Manuel George
Nidek Co. Ltd.
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