Automatic focussing system including in-focus position predictio

Details Automatic focussing system including in-focus position predictio Automatic focussing system including in-focus position predictio

1987-03-06

1988-08-09

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

358227, 354402, H04N 326, G03B 300

Patent

active

047629860

ABSTRACT:
An automatic focussing system is disclosed which comprises an output circuit for sequentially outputting signals corresponding to a focus condition in a predetermined period, a prediction circuit for predicting a focus point by use of at least three signals outputted from the output circuit and a control circuit for controlling focus on the basis of the result of prediction by the prediction circuit when the difference of two signal outputs outputted from the output circuit is below a predetermined value and when the levels of signals satisfy a predetermined condition. The automatic focussing system further includes a detection circuit for detecting lens information of a photographic lens and a correction circuit for correcting the predicted value by the prediction circuit in accordance with the lens information obtained by the detection circuit. Furthermore, the automatic focussing system includes inhibition means for inhibiting focus control on the basis of the predicted values when at least one of the maximum level and timing of the predicted values changes beyond an allowable range with respect to the previous predicted values.

REFERENCES:
patent: 4320417 (1982-03-01), Hanma et al.
patent: 4333007 (1982-06-01), Langlais et al.
patent: 4392726 (1983-07-01), Kimura
patent: 4422097 (1983-12-01), Inuiya
patent: 4531158 (1985-07-01), Murakami et al.
patent: 4687915 (1987-08-01), Sakai et al.

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