Zoom lens barrel assembly for constant magnification

Details Zoom lens barrel assembly for constant magnification Zoom lens barrel assembly for constant magnification

1979-10-17

1981-06-16

Clark, Conrad J.

Optics: motion pictures

Removable film strip magazine type

352 91R, G02B 1518

Patent

active

042734231

ABSTRACT:
A zoom lens barrel is constructed such that the axial movement and rotation of a single operation ring relative to a stationary barrel causes zooming and focusing respectively and provides a device for providing constant magnification photography. This is accomplished by a plurality of cam grooves provided on one of the operation ring and the stationary barrel and a guide pin provided on the other of the operation ring and the stationary barrel and releasably engageable with each of the cam grooves. Each of the cam grooves forces the operation ring to rotate upon axial movement of the operation ring through the engagement with the guide pin such that magnification remains constant during focusing. The magnification that remains constant during focusing varies depending on which of the cam grooves the guide pin is engaged with.

REFERENCES:
patent: 4083057 (1978-04-01), Quinn
patent: 4193667 (1980-03-01), Yasukuni

Affiliated with

Also associated with

Rating

Zoom lens barrel assembly for constant magnification 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 barrel assembly for constant magnification, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Zoom lens barrel assembly for constant magnification will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-152174