Zoom lens driving apparatus

Details Zoom lens driving apparatus Zoom lens driving apparatus

1988-12-27

1991-02-12

Arnold, Bruce Y.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358227, G02B 1500

Patent

active

049919440

ABSTRACT:
A zoom lens driving apparatus always detects a position of an image magnification varying lens section, and drives the image magnification varying lens section in accordance with a preset relationship between the position of the image magnification varying lens section and a zoom driving speed in such a manner that the driving speed becomes higher on one side, where the focal length of the zoom lens corresponding to the position of the image magnification varying lens section is small, than on another side where the focal length is large. Accordingly, the amount of focal shift, which in the zoom lens of the inner focusing system would otherwise abruptly increase with increasing focal length, is significantly suppressed, so that an auto focus adjusting mechanism or a focus correcting device effective during zooming, provided in the zoom lens, can function satisfactorily as to follow the focal shift of the zoom lens, whereby the lens control of a superior response can always be achieved.

REFERENCES:
patent: 4054372 (1977-10-01), Schroeder
patent: 4697891 (1987-10-01), Kawai
patent: 4735495 (1988-04-01), Makino et al.

Affiliated with

Also associated with

Rating

Zoom lens driving apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Zoom lens driving apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens driving apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-17065