Zoom lens apparatus

Details Zoom lens apparatus Zoom lens apparatus

1991-04-23

1993-04-13

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359684, 359764, G02B 1514, G02B 960

Patent

active

052029921

ABSTRACT:
In a zoom lens apparatus having a lens component which is movable for variation of image magnification, a lens component to compensate for the shift of focus caused by the variation of the image magnification and which is movable to bring an object to be photographed into focus, and a device for driving and positioning each of the lens components, there is provided a controller to control the device. The controller has a position table for each of the lens components and a memory to store the actual positions of the lens components. The controller compares each of the actual positions of the lens components stored in the memory with the position table, based on a signal for a desired magnification so that the zoom lens can focus on a predetermined image plane.

REFERENCES:
patent: 4802747 (1989-02-01), Horiuchi
patent: 4818083 (1989-04-01), Mihara
patent: 4859042 (1989-08-01), Tanaka
patent: 5061051 (1991-10-01), Miyamae
patent: 5100223 (1992-03-01), Ono et al.

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