Range finding automatic focusing system employing a rotatable tr

Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems

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354403, G01J 120

Patent

active

047406763

ABSTRACT:
An automatic focusing apparatus comprises a light emitting element emitting a beam of electromagnetic radiation directed toward a subject through a light projecting lens, a light receiving element receiving a beam spot reflected from the subject and passing through a light receiving lens, and a parallel-surface transparent plate disposed rotatably between the light receiving lens and the light receiving element. The parallel-surface transparent plate is rotated in interlocking relation with linear movement of an optical lens moving together with movement of a focus ring, thereby automatically attaining the focus by ceasing the movement of the lens optical system as soon as the output signal of the light receiving element attains a predetermined level.

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patent: 3622797 (1971-11-01), Bragg
patent: 4123650 (1978-10-01), Hosoe et al.
patent: 4355904 (1982-10-01), Balasubramanian
patent: 4383168 (1983-05-01), Luck, Jr.
patent: 4445029 (1984-04-01), Nagaoka et al.
patent: 4459004 (1984-07-01), Morizumi

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