Patent
1994-10-28
1996-08-20
Perkey, W. B.
354430, G03B 708, G03B 1336
Patent
active
055483704
ABSTRACT:
A vibration compensation device for detecting vibration in an optical system, particularly vibration of a camera caused by hand tremor, during light measurement or during focal point adjustment information detection, and minimizing the effect of vibration by repeating light measurement or focal point adjustment information detection. The vibration compensation device includes a photographic lens, angular velocity detection circuits, a decision unit including a CPU, a light measurement device, an autofocus (AF) device, motor drive circuits, motors, and lens position detection circuits. Light measurement is performed using the light measurement device and focal point adjustment information detection is performed by the AF device when a release button is pressed halfway. Light measurement or focal point adjustment information detection is repeated as if vibration is detected by angular velocity detection circuits during light measurement or during focal point adjustment information detection. If vibration is not detected during a measurement or detection operation before a specified number of repetitions is performed, the light measurement value or focal point adjustment information detection value at that time is adopted. If vibration is detected during each of the specified number of repetitions, the light measurement value or the focal point adjustment information detection value is determined based on the average value of the light measurement values and the average value of the focal point adjustment information detection values, respectively. In alternative embodiments, photography may be prohibited when vibration is detected during each of the specified number of repetitions; photography may be prohibited until the release button is pressed again; or the last light measurement value or focal point detection information value may be used.
REFERENCES:
patent: 5335042 (1994-08-01), Imafuji
Iida Yoshikazu
Nakamura Toshiyuki
Nikon Corporation
Perkey W. B.
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