Camera

Details Camera Camera

1992-03-27

1992-11-17

Perkey, W. B.

Optical: systems and elements

Prism

With reflecting surface

359698, 358227, G03B 1336, G02B 728

Patent

active

051647567

ABSTRACT:
A camera comprises a first lens group which is arranged to perform a power varying action, a second lens group arranged to adjust focus and to correct a change occurring in an image forming position according to the movement of the first lens group, a focus detection circuit arranged to detect the degree of focus, a memory arranged to store at least a standard speed at which the second lens group is moved to follow the movement of the first lens group without losing an in-focus state, a speed which is set to shift the image forming position forward relative to the standard speed and a speed which is set to shift the image forming position rearward relative to the standard speed; and a control circuit arranged to select from the memory the second lens group driving speed and to determine the driving direction according to the output of the focus detecting means and the moving direction of the first lens group.

REFERENCES:
patent: 4920369 (1990-04-01), Kaneda et al.
patent: 4935763 (1990-06-01), Itoh et al.
patent: 4950054 (1990-08-01), Wada et al.

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