Inner focusing zoom lens barrel

Details Inner focusing zoom lens barrel Inner focusing zoom lens barrel

2008-01-08

2009-08-11

Ben, Loha (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S700000

Reexamination Certificate

active

07573653

ABSTRACT:
The present invention is directed to an inner focusing zoom lens barrel provided with cams of a well-balanced configuration for smooth zooming and/or focusing operations, which attains sufficient performances at the minimum object distance, which is capable of inhibiting a focal length from varying throughout the entire zoom range, and which has a reduced outer diameter. The inner focusing zoom lens barrel has a fixed barrel, first and second cam barrels, a linear-shuttle barrel, a focusing cam barrel, a zooming relay barrel, and a 1st-lens-group sliding barrel, characterized in that the first cam barrel, the linear-shuttle barrel, and the focusing cam barrel are superposed one over another in this sequence inside the fixed barrel while the zooming relay barrel, the second cam barrel, and the 1st-lens-group sliding barrel are superposed one over another in this sequence outside the fixed barrel. The first cam barrel is formed with 3rd- and 4th-lens-group guiding cams, the linear-shuttle barrel is formed with 2nd-lens-group guiding cams, the zooming relay barrel is formed with 1st-cam-barrel guiding cams, the second cam barrel is formed with 1st-lens-group guiding cams, and the focusing cam barrel is formed with 2nd-lens-group focusing/guiding grooves and 2nd-lens-group guiding grooves.

REFERENCES:
patent: 6754011 (2004-06-01), Todani
patent: 7321471 (2008-01-01), Kuroki
patent: 7515355 (2009-04-01), Todani et al.
patent: 08-304684 (1996-11-01), None
patent: 2000-089086 (2000-03-01), None
patent: 2003-279835 (2003-10-01), None

Affiliated with

Also associated with

Rating

Inner focusing zoom lens barrel does not yet have a rating. At this time, there are no reviews or comments for this patent.

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

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4133593