Optical: systems and elements – Lens – With variable magnification
Patent
1992-07-16
1993-04-06
Arnold, Bruce Y.
Optical: systems and elements
Lens
With variable magnification
354400, 354403, G02B 711, G03B 300
Patent
active
052008606
ABSTRACT:
A lens position control device for a lens system, including a variator and a compensator which also serves as the focusing lens, comprises a detecting circuit for detecting positions of the variator and the compensator, a memory circuit for storing a plurality of pieces of information representing the manners in which the movement of the compensator is to be controlled in accordance with the positions of the variator and the compensator detected by the detecting circuit, the information concerning with at least the speed and the moving direction, a first control circuit responsive to operation of the zoom actuator for controlling the movements of the variator and the compensator, the first control means controlling the movement of the compensator in accordance with the information stored in the memory circuit, and a second control circuit responsive to detection of when the continuously read two pieces of information read out from the memory circuit come to differ from each other in the moving direction for controlling the movement of the compensator in a different manner from that indicated by the read information.
REFERENCES:
patent: 4847650 (1989-07-01), Iida et al.
patent: 4861146 (1989-08-01), Hatase et al.
patent: 4920369 (1990-04-01), Kameda et al.
patent: 4936664 (1990-06-01), Haraguchi et al.
patent: 5001509 (1991-03-01), Hamada et al.
Hirasawa Masahide
Kaneda Naoya
Suda Hirofumi
Wada Hiroyuki
Arnold Bruce Y.
Canon Kabushiki Kaisha
Phan James
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