Floating lens barrel, lens barrel, and a common lens barrel syst

Details Floating lens barrel, lens barrel, and a common lens barrel syst Floating lens barrel, lens barrel, and a common lens barrel syst

1998-10-22

2000-09-12

Epps, Georgia

Optical: systems and elements

Lens

With support

354700, 354699, G02B 702

Patent

active

061186015

ABSTRACT:
A floating lens barrel includes a stationary barrel which can be connected to a camera body, a rotation ring which is rotatably supported by the stationary barrel and which is rotated in accordance with the focusing operation, a female helicoid ring provided on the stationary barrel, a front lens support ring which supports a focusing front lens group and which is guided to move linearly in the optical axis direction, a male helicoid ring which is supported by the front lens support ring so as to rotate relative thereto but not to move in the optical axis direction relative to the front lens support ring, a combination of rotation transmission grooves and pins for transmitting the rotation of the rotation ring to the male helicoid ring, and a rear lens support ring which holds a focusing rear lens group and which is guided to move linearly in the optical axis direction by the front lens support ring, in accordance with a cam groove formed in the male helicoid ring. A non-floating lens barrel and a common lens barrel system are also disclosed.

REFERENCES:
patent: 3772978 (1973-11-01), Mito
patent: 3895858 (1975-07-01), Sawano
patent: 4309076 (1982-01-01), Ito
patent: 4458990 (1984-07-01), Kawai
patent: 4472039 (1984-09-01), Iwata et al.
patent: 4564264 (1986-01-01), Komoto
patent: 5018843 (1991-05-01), Inadome et al.
patent: 5956189 (1999-09-01), Azegami et al.

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