Lens Barrel

Details Lens Barrel Lens Barrel

1985-09-23

1987-09-01

Perkey, W. B.

G03B 310

Patent

active

046905375

ABSTRACT:
An automatic focusing camera includes a camera body and an interchangeable objective lens. The camera body includes a detector device exposed to the object image and a circuit providing a signal of a value in accordance with the detector device sensed difference between the object image, a predetermined focal plane and a circuit responsive to the signal for controlling a motor to rotate an amount in accordance with the signal. The objective lens includes a stationary front lens and an axially movable focusing lens which axially moves with a follower engaging the cam way of a cylindrical cam which is gear rotated by the separably coupled motor shaft. The cam is shaped whereby .DELTA..theta.=C.multidot..DELTA.L wherein .DELTA..theta. is the amount of rotation of the motor, .DELTA.L is the axial movement of the object image and C is a constant depending on the objective lens which has a ROM having information in accordance with C and which is separably coupled to the motor control circuit.

REFERENCES:
patent: 4509842 (1985-04-01), Taniguchi et al.
patent: 4548488 (1985-10-01), Honda et al.
patent: 4560267 (1985-12-01), Nakai et al.

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