Lens barrel with screw mount

Details Lens barrel with screw mount Lens barrel with screw mount

1991-01-04

1992-11-03

Hix, L. T.

Optical: systems and elements

Prism

With reflecting surface

359825, G03B 1700

Patent

active

051609568

ABSTRACT:
A lens barrel is provided having a screw mount. The lens barrel includes a mount ring having a threaded portion, which can be engaged by a corresponding screw mount of the camera body to which the lens barrel is to be attached, a focus adjusting ring which is rotatably supported by the mount ring, a barrel body which is screw-engaged by the focus adjusting ring to support a focus adjusting lens, a linear movement guide member which is rotatably supported by the mount ring to restrict the movement of the barrel body so as to move only in the optical axis direction of the focus adjusting lens, and a frictional resisting member which resists the rotational movement of the linear movement guide member relative to the mount ring. The frictional resisting member provides a resistance so that when the focus adjusting ring is rotated, no rotation of the linear movement guide member relative to the mount ring takes place, and when the rotational force is applied to the barrel body, the linear movement guide member can be rotated relative to the mount ring.

REFERENCES:
patent: 2691322 (1954-10-01), Wittel
patent: 4640579 (1987-02-01), Takizawa

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