Optical apparatus for correcting the spherical aberration of a s

Details Optical apparatus for correcting the spherical aberration of a s Optical apparatus for correcting the spherical aberration of a s

1977-03-23

1980-04-08

Clark, Conrad J.

Optics: measuring and testing

Range or remote distance finding

With photodetection

350204, 356386, G02B 2717

Patent

active

041969618

ABSTRACT:
An optical apparatus for use in conjunction with spherically shaped concave mirrors for substantially eliminating aberrations in the reflections from such mirror. The mirror cooperates with a light source or a light receiver placed in the vicinity of but off-set relative to the natural focal point of the mirror. A plane parallel, transparent plate is placed between the mirror and the light source or receiver and it has a size so as to intercept light rays between the mirror and the light source or receiver and which respectively result in or are caused by light beams oriented parallel to the optical axis of the mirror. Use of the invention for additionally correcting astigmatism and chromatic aberrations caused by spherical mirrors is disclosed. Also disclosed is the use of the invention in connection with large spherical mirrors forming part of light curtain arrangements.

REFERENCES:
patent: 2429462 (1947-10-01), Henroteau
patent: 2449259 (1948-09-01), Van Alphen
patent: 2812685 (1957-11-01), Vossberg
patent: 2971695 (1961-02-01), Sick
patent: 3244073 (1966-04-01), Bouwers
patent: 3752599 (1973-08-01), Rosin
patent: 4025796 (1977-05-01), Erdmann

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