Two-reflecting catadioptric optical system

Details Two-reflecting catadioptric optical system Two-reflecting catadioptric optical system

1977-06-14

1979-08-21

Clark, Conrad J.

G02B 1700

Patent

active

041651510

ABSTRACT:
The present invention relates to a catadioptric optical system provided with two-reflecting surfaces, or a reflecting-refractive type objective. A two-reflecting catadioptric optical system includes a front positive lens having a front surface of which the radius of curvature is smaller than that of a rear surface thereof, a negative meniscus lens positioned on the image side of said front positive lens in axially aligned relation thereto, having a front surface concave toward the front, and having a rear surface provided with a mirrored portion surrounding a light-permeable region, a positive meniscus lens convex toward the front and arranged between said front positive lens and said negative meniscus lens, a convex mirror facing to the rear and arranged between said front positive lens and said positive meniscus lens, a negative lens cemented together with the front surface of said negative meniscus lens, and a positive lens cemented together with the rear surface of the negative meniscus lens at the light-permeable region thereof.

REFERENCES:
patent: 3490831 (1970-01-01), Takahashi
patent: 3507556 (1970-04-01), Shimizu
patent: 4106855 (1978-08-01), Coon

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