Method and apparatus for detecting focus condition of objective

Details Method and apparatus for detecting focus condition of objective Method and apparatus for detecting focus condition of objective

1982-09-29

1984-04-17

Gellner, Michael L.

G03B 300

Patent

active

044430795

ABSTRACT:
A focus condition of an objective lens is detected on the basis of a lateral shift of two images formed by first and second light fluxes which are transmitted through right- and left-hand halves of the lens, respectively. In order to separate the first and second light fluxes, there is arranged an array of triangle prisms each having first and second surfaces which are inclined symmetrically with respect to the optical axis of lens by a critical angle so that one of the light fluxes is transmitted through the one of the surfaces, but is totally reflected by the other surface of each prism. The first and second light fluxes transmitted through the prisms are received by an array of light receiving elements in such a manner that the first and second light fluxes are selectively received by odd and even numbered light receiving elements, respectively.

REFERENCES:
patent: 4185191 (1980-01-01), Stauffer
patent: 4387975 (1983-06-01), Araki

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