In-focus position detecting apparatus

Details In-focus position detecting apparatus In-focus position detecting apparatus

1983-12-20

1986-10-21

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354403, G01J 120

Patent

active

046187626

ABSTRACT:
An in-focus position detecting optical system comprises a focus lens for imaging the image of an object to be photographed at an imaging position. The focus lens has integrally formed therewith a light projecting lens for projecting a distance measuring light flux onto the object to be photographed. The light projecting lens has the same focal length as that of the focus lens.

REFERENCES:
patent: 3836919 (1974-09-01), Matsumoto et al.
patent: 4150888 (1979-04-01), Filipovich
patent: 4313654 (1982-02-01), Matsui et al.
patent: 4394077 (1983-07-01), Yoshino et al.
patent: 4460259 (1984-07-01), Greivenkamp
patent: 4483613 (1984-11-01), Yokota

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