Lens barrel

Details Lens barrel Lens barrel

1998-11-04

2000-06-27

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359826, 359694, G02B 1514, G02B 702

Patent

active

060813911

ABSTRACT:
A lens barrel includes a fixed frame, a plurality of lens groups disposed inside the fixed frame movably along an optical axis relative to the fixed frame, at least three lens holding frames holding at least one lens group, a cam frame having bottomed can grooves coupled with the inner circumference of the fixed frame through cams, bottomed can grooves crossing each other coupled with the lens holding frames through cams and a bottomed cam groove which is discontinued at one end surface and continued on another end surface, a key regulating rotation of the lens holding frames about an optical axis relative to the fixed frame as well as reinforcing the strength of the lens barrel, a cam mechanism between the cam frame and the lens holding frames for moving the lens holding frames along the optical axis by rotation of the cam frame about the optical axis relative to the fixed frame, an internal gear on the inner circumference of the cam frame, a pinion gear transmitting drive force from a drive source to the internal gear, flexible printed substrates overlapped in a thickness direction electrically connected to the lens frames moving along the optical axis having a U-shape and not overlapping each other at their bent portions, rod members having two lens holding frames disposed at opposite ends along the optical axis of the lens holding frames, and parallel to the optical axis, and bearings for receiving the rod members

REFERENCES:
patent: 4787720 (1988-11-01), Fukita et al.
patent: 4864348 (1989-09-01), Fujiwara
patent: 5043742 (1991-08-01), Kohmoto
patent: 5082360 (1992-01-01), Sato et al.
patent: 5218479 (1993-06-01), Chiou et al.
patent: 5373397 (1994-12-01), Satoh et al.
patent: 5376983 (1994-12-01), Yamazaki et al.
patent: 5488513 (1996-01-01), Tanaka

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