JPS5847818U

JPS5847818U - Aperture presetting device for photographic lens barrel

Info

Publication number: JPS5847818U
Application number: JP1981142078U
Authority: JP
Inventors: 邦博吹野; 幸夫斎藤
Original assignee: 株式会社ニコン
Priority date: 1981-09-25
Filing date: 1981-09-25
Publication date: 1983-03-31

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は本考案の実施例の断面図、第２図及び第３図は
第１図実施例の夫々Ａ−Ａ断面図、Ｂ−Ｂ断面図である
。・１・・・・・・固定鏡筒、３・・・・・・絞り調節環、
４・・・・・・距離調節環、７・・・・・・直進鏡筒、
８・・・・・・外筒、９・・・・・・内筒、１０・・・
・・・キー溝、１１・・・・・・キ一部、１２・・・・
・・平面部、１３・・・・・・キ一部材、１６・・・・
・・カム、１７・・・・・・キー、１８・・・・・・カ
ム環、２０・・・・・・腕部、２１・・・・・・キー溝
、Ｌｌ、　Ｌ２・・・・・・光学系、Ｄ・・・・・・自
動絞り装置。FIG. 1 is a sectional view of an embodiment of the present invention, and FIGS. 2 and 3 are sectional views taken along line AA and line BB, respectively, of the embodiment shown in FIG.・ 1... Fixed lens barrel, 3... Aperture adjustment ring,
4... Distance adjustment ring, 7... Straight lens barrel,
8... Outer cylinder, 9... Inner cylinder, 10...
...Keyway, 11...Key part, 12...
・・Plane part, 13・・Key member, 16・・・・
...Cam, 17...Key, 18...Cam ring, 20...Arm, 21...Keyway, Ll, L2... ...Optical system, D...Automatic aperture device.

Claims

[Scope of utility model registration request]

In a photographic lens having a fixed lens barrel that rotatably supports a distance adjustment ring and an aperture adjustment ring and is attached to a camera body, and a linear lens barrel that has a built-in optical system and an automatic aperture device and is movable in the direction of the optical axis. , the linear lens barrel is configured to include an outer barrel that is linked to the distance adjustment ring and an inner barrel that has at least a part of the optical system, and a cam ring that has a cam that determines the aperture aperture is attached to the outer barrel. A part of the key is provided to rotatably fit on the inner surface of the fixed lens barrel, and a key portion that engages with a key groove long in the optical axis direction provided on the inner surface of the fixed lens barrel, and the cam ring are configured to move together with the outer barrel. A key and a member consisting of a flat part that suppresses relative movement of the cam ring and the outer cylinder in the optical axis direction are fixed to the outer cylinder, and between the cam ring and the inner cylinder. The inserted arm portion is provided to rotate together with the diaphragm adjustment ring,
i extending in the optical axis direction on either the arm portion or the cam ring;
- An aperture presetting device for a photographing lens barrel, characterized in that the groove is provided with a key that engages with the key groove on the other side, so that the aperture adjustment ring and the cam ring are rotated in conjunction with each other.