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US 4,306,762 AGranted
Reflecting apparatus in an optical system
AssigneeTokina Optical Co., Ltd.
InventorsYoshimi Yamashita, Tatsuyo Takanashi
Life of this patent
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Abstract
A reflecting apparatus in an optical system in which, in order to transmit image light effectively to a light receiving body having a given spectral sensitivity characteristic, either a single or plural reflecting film layer, having a spectral sensitivity characteristic approximately equal to that of the light receiving body, is formed on a polished surface which forms one face of a light absorbing substance.
Claims4
A reflecting apparatus in an optical system for transmitting light from an original to an object to be exposed to light, comprising:
- a casing for eliminating extraneous light;
- a converging lens disposed in an opened portion formed at one end of said casing;
- a substrate made of a light-absorbing substance and disposed within said casing behind said converging lens and having a face confronting said converging lens, said face being polished for specular reflection;
- at least one reflecting film layer formed on said polished face and adapted to reflect light of a desired wavelength almost matching the spectral sensitivity characteristic of the object to be exposed to light;
- and
- said substrate is adapted to substantially completely absorb at least light having passed through said at least one reflecting film layer and also to absorb most of the light rays in the visible wavelength region.
3 more elements
Dependencies are inferred from the claim text.