JPS5953308U

JPS5953308U - zoom lens barrel

Info

Publication number: JPS5953308U
Application number: JP14710882U
Authority: JP
Inventors: 大森　幸男; 内藤　英史; 塩釜　吉晴
Original assignee: 株式会社ニコン
Priority date: 1982-09-30
Filing date: 1982-09-30
Publication date: 1984-04-07

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、本考案の実施例を示す断面図、第２図は、従
来の構造を示す断面図、第３図は、第１図のへリコイド
ねじ部分の斜視図である。〔主要部分の符号の説明〕、Ｌｌ・・・フォーカシング
レンズ、Ｌ２．Ｌ３・・・ズーミングレンズ、Ｌ４・・
・固定レンズ、１５・・・操作環、１２・・・第１へリ
コイド筒（固定鏡筒）、１８・・・第２ヘリコイド筒（
付属品取り付はリング）、１７・・・第３ヘリコイド筒
、１９．２０・・・キ一部材。FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view showing a conventional structure, and FIG. 3 is a perspective view of the helicoid thread portion of FIG. 1. [Explanation of symbols of main parts], Ll... focusing lens, L2. L3...zooming lens, L4...
・Fixed lens, 15... Operating ring, 12... First helicoid tube (fixed lens barrel), 18... Second helicoid tube (
Accessories are attached by ring), 17...3rd helicoid cylinder, 19.20...Key part.

Claims

[Claims for Utility Model Registration] 1. In a zoom lens barrel equipped with an optical system including at least a lens group that acts for focusing and a lens group that acts for zooming; a first helicoid screw on the outer periphery; a first helicoid ring integrated with a fixed lens barrel; a second helicoid screw for supporting the lens group that acts for focusing, a device for attaching accessories, and a second helicoid screw on the outer periphery; a second helicoid ring; a third helicoid screw that rotates around the optical axis in conjunction with the rotation operation of the focusing operation ring around the optical axis, and is screwed onto the inner periphery of the first helicoid screw; , a third helicoid screw provided with a fourth helicoid screw threadably engaged with the second helicoid screw;
a helicoid ring; and a means for restricting rotation of the second helicoid ring about the optical axis center so as to be movable in the optical axis direction with respect to the first helicoid ring. A zoom lens barrel. 2. The utility model registered in claim 1, characterized in that the third helicoid screw and the fourth helicoid screw are arranged side by side in the optical axis direction at positions with approximately the same diameter. zoom lens barrel. 3. Connect the lead of the fourth helicoid screw to 1rIrI.
The zoom lens barrel according to claim 1 or 2 of the utility model registration claim, wherein the zoom lens barrel is set to be below IL. 4. A request for registration of a utility model characterized in that the means for restricting the rotation of the second helicoid ring are provided in at least two locations = 7 with shifted angular positions, and are arranged so that the intervals are approximately equal. The zoom lens barrel according to the range 1 or 2.