Patent
1978-11-13
1980-04-08
Sacher, Paul A.
350199, G02B 1708
Patent
active
041969677
ABSTRACT:
In an optical system including a transparent optical body such as a lens and a light reflecting surface disposed in the rear of the transparent optical body with a spacer of a light absorptive material being sandwiched therebertween to ensure the relative position and other optical relationship of the body and the surface. The spacer is cemented to a rear surface of the transparent body for masking the light reflecting surface and preventing light rays from entering from the front of the transparent optical body to the light reflecting surface to be reflected back by the latter. According to the present invention, the front surface of the spacer to be cemented to the rear surface of the transparent optical body is, before being cemented, polished to a degree of roughness which prevents the occurrence of fringes due to interference at a possible small gap between the transparent optical body and the spacer.
A typical example of the optical system is a reflecting type telephoto lens including a front lens in the rear of which is fixed, by a spacer, a second light reflecting surface which folds the photographic light reflected by a first reflecting surface.
REFERENCES:
patent: 2748658 (1956-06-01), Bouwers
Innami Shigeru
Ohnishi Kazuo
Satou Kaname
Minolta Camera Kabushiki Kaisha
Sacher Paul A.
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