Focusing control apparatus with aberration compensation

Details Focusing control apparatus with aberration compensation Focusing control apparatus with aberration compensation

1990-12-31

1992-06-16

Perkey, W. B.

Optical: systems and elements

Prism

With reflecting surface

35419512, 359707, G03B 300, G03B 1318

Patent

active

051228262

ABSTRACT:
A focusing control apparatus comprises a focusing information detector for detecting focusing control information regarding a focusing lens and an auxiliary lens set position detector for detecting a set position of an auxiliary lens such as a soft focus lens. A stored correction coefficient for the set position of the auxiliary lens is utilized, together with the focusing control information, in determining a drive distance of the focusing lens to achieve proper focusing. In one modification, if the auxiliary lens is manipulated and the set position thereof is changed after an in-focus state is attained in a single mode, the above process is repeated. In another modification, if the auxiliary lens is manipulated after the in-focus state is attained in the single mode, the mode is switched to a continuous mode.

REFERENCES:
patent: 4768054 (1988-08-01), Norita et al.
patent: 4957354 (1990-09-01), Matsuyama

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