1987-12-16
1989-06-20
Perkey, W. B.
354266, G03B 300, G03B 1740
Patent
active
048413240
ABSTRACT:
A camera having a continuous photographing mode in which an exposure operation and a one frame-wind-up operation of a film are repeatedly carried out, comprising RAM, CCD, A/D convertor, a motor, encoder and AF lens control device. The CCD and A/D convertor detect a defocus distance of a photographing lens and form a data representing the detected defocus distance and store said data in the RAM. The motor drives the photographing lens. The encoder detects a driven distance of the photographing lens driven by the motor to generate a detection signal and the motor drives the photographing lens such that the drive distance represented by the detection signal coincides with the defocus distance represented by the data of the RAM. The AF lens control device discontinues the drive of the photographing lens by the motor prior to the start of the exposure operation in the continuous photographing mode and resumes the drive in the period of a subsequent one-frame wind-up operation. The device controls the motor such that the motor drives the photographing lens in response to the resumption by a distance corresponding to a difference between the drive distance represented by the detection signal at the time of discontinuance and the defocus distance represented by the data of the RAM.
REFERENCES:
patent: 3798660 (1974-03-01), Hasegawa et al.
patent: 4435058 (1984-03-01), Yoshida et al.
patent: 4464037 (1984-08-01), Terui et al.
patent: 4563069 (1986-01-01), Sakai et al.
Nikon Corporation
Perkey W. B.
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