Drive member sensing arrangement for an automatic focusing syste

Details Drive member sensing arrangement for an automatic focusing syste Drive member sensing arrangement for an automatic focusing syste

1991-11-21

1992-12-29

Perkey, W. B.

G03B 1336

Patent

active

051755777

ABSTRACT:
An automatic focusing system for a camera comprises a motor rotatable in opposite directions, a drive member driven for rotation by the motor, a distance-setting member rotatable together with the drive member to place an objective lens in an initial position and movable to a predetermined forward position, and a holding mechanism for holding the distance-setting member in the predetermined forward position. The position of the drive member is identified at each monitoring point, and a position identification signal is generated. The sequence of movement of the distance-setting member is analyzed from a starting position to the predetermined forward position. The system further provides for preventing improper holding of the distance-setting member at its initial position.

REFERENCES:
patent: 4348089 (1982-09-01), Shenk
patent: 4881096 (1987-02-01), Ogihara et al.
patent: 4918479 (1989-04-01), Inoue et al.

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