Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1989-05-05
1990-11-06
Perkey, W. B.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
2502012, G03B 1336, G02B 728
Patent
active
049690035
ABSTRACT:
An auto-focus device or a camera equipped with such a device includes a focus detecting circuit for repeatedly detecting focus, in which an image forming optical system is driven on the basis of the focusing quantity detected by the focus detecting circuit. A speed computing circuit is provided for computing a speed of movement of an image plane corresponding to movement of the object on the basis of past autofocusing operation data. A drive data computing circuit is provided for predictive-computing data relating to a drive position of the image forming optical system, considering the movement of the object, on the basis of the past autofocusing operation data. A speed control circuit is provided for controlling a driving speed of the image forming optical system on the basis of the speed obtained by the speed computing circuit. A drive circuit is provided for driving the image forming optical system in one of a first mode in which a drive position of the optical system is controlled in accordance with data obtained by the drive data computing circuit without actuating the speed control circuit, and a second mode in which a driving speed of the optical system is controlled by the speed control circuit without actuating the drive position of the optical system using the drive data computing circuit. Finally, a selection circuit is provided for selecting between the first and second modes.
REFERENCES:
patent: 4816856 (1989-03-01), Hamada et al.
Akashi Akira
Higashihara Masaki
Kadohara Terutake
Ohnuki Ichiro
Canon Kabushiki Kaisha
Perkey W. B.
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