Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1989-02-02
1990-03-13
Perkey, W. B.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
2502012, G03B 300
Patent
active
049086456
ABSTRACT:
An automatic focusing device for foreseeing or predicting the position of object after a predetermined time, based on plural past focusing operations on the object, utilizing a function of a higher order, and driving a lens for focusing to the predicted object position. According to the present invention there is provided a correcting circuit for correcting the coefficients of the higher-order function to reduce the influence of the measuring errors contained in the past focusing results, thus constantly enabling appropriate focusing.
REFERENCES:
patent: 4600832 (1986-07-01), Grund
patent: 4681419 (1989-07-01), Sakai et al.
patent: 4762986 (1988-08-01), Suda et al.
patent: 4783677 (1988-11-01), Hamada et al.
patent: 4816856 (1989-03-01), Hamada et al.
patent: 4841325 (1989-06-01), Hoshino et al.
Akashi Akira
Higashihara Masaki
Kadohara Terutake
Ohnuki Ichiro
Suda Yasuo
Canon Kabushiki Kaisha
Perkey W. B.
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