Lens accessory attaching mechanism

Details Lens accessory attaching mechanism Lens accessory attaching mechanism

1994-02-23

1996-01-09

Ben, Loha

Optical: systems and elements

Lens

With support

359830, 354286, 35419511, G02B 702

Patent

active

054833841

ABSTRACT:
A lens accessory attaching mechanism is provided to attach a lens accessory to a lens barrel. The lens attaching mechanism has four pairs of first and second rollers attached to the proximal end portion of the lens accessory into which the distal end of the lens barrel is inserted. The first and second rollers are equiangularly spaced in the circumferential direction of the lens accessory and are movable in a radial direction thereof. A ring spring arranged around all of the first and second rollers urges the rollers radially inwardly. An outer flange portion formed on the outer periphery of the lens barrel abuts the first and second rollers to restrict the movement of the lens accessory in the axial direction of the lens barrel. Four engaging protrusions which are formed on the outer periphery of the lens barrel in front of the outer flange portion, and equiangularly arranged in the circumferential direction of the lens barrel, engage either of the first or second rollers upon rotation of the lens accessory to securely attach the lens accessory to the lens barrel.

REFERENCES:
patent: 2500050 (1950-03-01), Wittel
patent: 3906534 (1975-09-01), Shirasaki
patent: 4017878 (1977-04-01), Hagiwara
patent: 4066330 (1978-01-01), Jones
patent: 4305386 (1981-12-01), Tawara
patent: 4384767 (1983-05-01), Kawai
patent: 4408499 (1983-10-01), Haneishi
patent: 4898453 (1990-02-01), Hohenecker
patent: 5223980 (1993-06-01), Hamasaki
patent: 5227825 (1993-07-01), Eguchi et al.
patent: 5313329 (1994-05-01), Ueda

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