Lens barrel

Details Lens barrel Lens barrel

1996-08-29

2000-10-03

Spyrou, Cassandra

Optical: systems and elements

Lens

With variable magnification

359704, G02B 1514

Patent

active

061281425

ABSTRACT:
A lens barrel having a resin cylindrical cam with spiral cam slots extending over an area range as wide as possible, and preferably more than 90.degree., which enables improvement of the formability of the spiral cam slots on the cylindrical cam, The cylindrical cam with spiral cam slots moves a photographing lens system forward and backward in a direction along the optical axis. The spiral cam slot includes a plural number of areas divided around the axis of the cylindrical cam, and in each of the cam areas the spiral cam slot has a cam surface and a surface opposite to the cam surface. The cain surface is formed at one side of a section of the spiral cam slot taken along a plane containing a normal line to the axis of the cylindrical cam and orthogonal to the locus along the cam slot. The opposite surface is formed at the other side of the section of the spiral cam slot and is inclined to the cam surface providing that these opposite surfaces in adjacent areas be inclined in opposite directions to each other. Each adjoining part between cam areas includes a first border portion in which the inclined surface is formed by a surface approximately parallel to the cam surface, or a second border portion in which the inclined surface is formed by two oppositely inclined adjacent surfaces, the first and second border portions being disposed alternately in the plural number of cam areas

REFERENCES:
patent: 3610733 (1971-10-01), Back
patent: 3817601 (1974-06-01), Colaiace et al.
patent: 4707083 (1987-11-01), Iizuka et al.
patent: 5066103 (1991-11-01), Kodaka et al.
patent: 5216549 (1993-06-01), Notagashira et al.
patent: 5255124 (1993-10-01), Iwamura
patent: 5666565 (1997-09-01), Wakabayashi et al.

Affiliated with

Also associated with

Rating

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 Lens barrel, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lens barrel will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-201440