Drive controller for lens apparatus

Details Drive controller for lens apparatus Drive controller for lens apparatus

2006-08-22

2006-08-22

Thompson, Timothy (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S694000, C359S697000

Reexamination Certificate

active

07095566

ABSTRACT:
A drive controller for a lens apparatus including a first lens unit which moves for changing magnification and a second lens unit which moves to prevent an image plane variation in response to the first lens unit moving to change the magnification. The drive controller includes a memory storing a plurality of tracking data corresponding to position data of the second lens unit, and a control unit for detecting a change in a focus state of the lens apparatus during the movement of the first lens unit and for changing one of the plurality of tracking data based on the detection result. The control unit stores a direction of the changing of the one tracking data and thereafter changes the one tracking data based on the stored direction.

REFERENCES:
patent: 5438190 (1995-08-01), Kaneda et al.
patent: 5486860 (1996-01-01), Shiokawa et al.
patent: 5815203 (1998-09-01), Lee et al.
patent: 5949586 (1999-09-01), Hirasawa et al.
patent: 6314240 (2001-11-01), Okawara
patent: 2004/0061949 (2004-04-01), Yakita et al.

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