Optical system having compound prism design to reduce ghosts and

Details Optical system having compound prism design to reduce ghosts and Optical system having compound prism design to reduce ghosts and

1997-02-18

1998-11-10

Epps, Georgia Y.

Optical: systems and elements

Single channel simultaneously to or from plural channels

By partial reflection at beam splitting or combining surface

359640, G02B 2714, G02B 2712

Patent

active

058352767

ABSTRACT:
A prism optical system provided with: a first prism on which a light ray coming from an objective lens is incident; a second prism on which the light ray coming from this first prism is incident, and from which this incident light ray is emitted; and a plate-like member which is interposed between the aforesaid prisms so as to provide a predetermined air space therebetween and which has a diaphragm opening and a light blocking portion. Further, an uneven portion, which consists of depressions and projections and has a serrate section, for preventing light rays, which have been reflected from the surface of the light blocking portion of this plate-like member, from entering a field stop is provided in the light blocking portion thereof. Thereby, occurrences of ghosts and flares due to stray light are prevented. Moreover, ghosts and flares are reduced.

REFERENCES:
patent: 4113354 (1978-09-01), Yamasita et al.
patent: 4701772 (1987-10-01), Anderson et al.
patent: 5066101 (1991-11-01), Aoki et al.
patent: 5243465 (1993-09-01), Fein

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