JPS61153014U

JPS61153014U -

Info

Publication number: JPS61153014U
Application number: JP3575985U
Authority: JP
Priority date: 1985-03-13
Filing date: 1985-03-13
Publication date: 1986-09-22

Description

[Brief explanation of drawings]

第１図は、本考案の一実施例を示す焦点位置調
整機構を有したレンズ鏡筒の上半部の断面図、第
２図Ａ，ＢおよびＣは、それぞれ上記第１図に示
す調整機構におけるスペーサの斜視図、側面図お
よび拡大断面図、第３図は、本考案の他の実施例
を示す焦点位置調整機構の分解斜視図、第４図は
、本考案に用いられるスペーサの他の例を示す要
部の拡大斜視図、第５，６図は、それぞれ本考案
の更に他の実施例を示す焦点位置調整機構の断面
図とそのＡ―Ａ線に沿う断面図、第７図は、本考
案に用いられるスペーサの更に他の例を示す斜視
図、第８図は、従来の焦点位置調整機構を有した
レンズ鏡筒の一例を示す上半部の断面図、第９図
は、上記第８図に示す調整機構における間隔環の
斜視図、第１０，１１図は、それぞれ、従来の調
整機構に用いられる各間隔環の斜視図である。１……レンズマウント、２……固定枠、２ｂ…
…段部前面、３……レンズ群、４……レンズ保持
枠、４ｂ……後端面、５……調整用長孔、６……
ねじ、７……距離調節用レンズ、１５，２５，３
５……弾性変形部材からなるＣリング状のスペー
サ、１５ａ，１５ｂ，２５ａ……スペーサの端部
、１６，１７……凹部（逃げ部）。 FIG. 1 is a cross-sectional view of the upper half of a lens barrel having a focal position adjustment mechanism showing an embodiment of the present invention, and FIGS. 2A, B, and C show the adjustment mechanism shown in FIG. 1 above, respectively. FIG. 3 is an exploded perspective view of a focal position adjustment mechanism showing another embodiment of the present invention, and FIG. 4 is an exploded perspective view of another spacer used in the present invention. FIGS. 5 and 6 are an enlarged perspective view of the main parts showing an example, and FIGS. 5 and 6 are a sectional view and a sectional view taken along the line A--A of a focal position adjustment mechanism showing still another embodiment of the present invention, respectively, and FIG. , FIG. 8 is a perspective view showing still another example of the spacer used in the present invention, FIG. 8 is a sectional view of the upper half of an example of a lens barrel having a conventional focal position adjustment mechanism, and FIG. The perspective view of the spacing ring in the adjustment mechanism shown in FIG. 8, and FIGS. 10 and 11 are perspective views of each spacing ring used in the conventional adjustment mechanism, respectively. 1...Lens mount, 2...Fixed frame, 2b...
...Front surface of step part, 3... Lens group, 4... Lens holding frame, 4b... Rear end surface, 5... Long hole for adjustment, 6...
Screw, 7... Lens for distance adjustment, 15, 25, 3
5... C-ring shaped spacer made of an elastically deformable member, 15a, 15b, 25a... Ends of the spacer, 16, 17... Recessed portions (relief portions).

Claims

[Scope of Claim for Utility Model Registration] (1) A frame that is fixed in the optical axis direction to the mount of the camera body when attached to the camera body, and a frame that holds the lens group and that is fixed in the optical axis direction with respect to the fixed frame. C consisting of a lens holding frame whose position is freely adjustable; and an elastically deformable member interposed between the fixed frame and the lens holding frame to determine the position of the lens holding frame in the optical axis direction with respect to the fixed frame.
A lens focal position adjustment mechanism comprising a ring-shaped spacer and. (2) Utility model registration claim 1, characterized in that at least one of the fixed frame and the lens holding frame is formed with a relief portion that does not press and clamp the vicinity of both ends of the C-ring shape of the spacer. The focal position adjustment mechanism of the lens described in section 2. (3) Utility model registration claim 1, characterized in that the spacer is arranged so that both ends of the C-ring shape are avoided from mutually opposing portions of the fixed frame and the lens holding frame. The focal position adjustment mechanism of the lens described in section 2.