JPS6449807U

JPS6449807U -

Info

Publication number: JPS6449807U
Application number: JP13636887U
Authority: JP
Priority date: 1987-09-07
Filing date: 1987-09-07
Publication date: 1989-03-28
Anticipated expiration: 2002-09-07
Also published as: JPH0755527Y2

Description

[Brief explanation of the drawing]

第１図は本考案に係るレンズ鏡筒のガタ防止構
造の実施例を示す上半断面図、第２図は第１図の
実施例における重なり合う複数カム溝に嵌合され
るガイドローラの断面図、第３図は第１図の実施
例における単一のカム溝に嵌合されるガイドロー
ラの断面図、第４図は第１図の−線に沿う拡
大断面図、第５図は第１図の−線に沿う拡大
断面図、第６図は重なり合うカム溝の一例として
の複雑曲線カム溝とにローラが嵌合された状態の
概略平面図である。１０……固定ガイド環（環状部材）、１１……
周方向溝、１２１３……直進カム溝、２０……直
進カム環（環状部材）、２３，２４……複雑曲線
カム溝、３０……回転カム環（環状部材）、３１
……後群レンズ枠（環状部材）、６１，７１……
ローラ、６２，７２……固定ねじ、６４，６５，
７４……環状弾性部、６６，７４……小径部、６
７……変形抑制リング、Ｌ……〓間。 Fig. 1 is an upper half sectional view showing an embodiment of the lens barrel rattling prevention structure according to the present invention, and Fig. 2 is a sectional view of a guide roller fitted into multiple overlapping cam grooves in the embodiment of Fig. 1. , FIG. 3 is a cross-sectional view of a guide roller fitted into a single cam groove in the embodiment of FIG. 1, FIG. 4 is an enlarged cross-sectional view taken along the line - in FIG. FIG. 6 is an enlarged sectional view taken along the line - in the figure, and a schematic plan view of a state in which a roller is fitted into a complex curved cam groove as an example of overlapping cam grooves. 10... Fixed guide ring (annular member), 11...
Circumferential groove, 1213... Straight cam groove, 20... Straight cam ring (annular member), 23, 24... Complex curved cam groove, 30... Rotating cam ring (annular member), 31
...Rear group lens frame (annular member), 61, 71...
Roller, 62, 72...Fixing screw, 64, 65,
74... Annular elastic part, 66, 74... Small diameter part, 6
7... Deformation suppression ring, L... Between.

Claims

[Claims for Utility Model Registration] (1) A lens in which a cam groove is provided in at least one of a plurality of annular members that are fitted so as to be able to slide relative to each other, and a roller that fits in the cam groove is fixed to the other one. The lens barrel is characterized in that the roller is provided with an annular elastic part that is elastically deformable inward in the radial direction and is in constant elastic contact with the inner surface of the cam groove. Structure to prevent mating play. (2) In paragraph 1 of the claims for utility model registration,
The roller is fixed to the annular member by a fixing screw inserted through its center, and there is a gap between the outer periphery of the head of the fixing screw and the inner surface of the annular elastic part, which allows the elastic deformation of the annular elastic part but does not allow elastic deformation. A rattling prevention structure between the cam groove and the roller in the relative sliding ring of the lens barrel, which has an annular gap that suppresses elastic deformation that exceeds the limit. (3) Scope of claims for utility model registration, paragraph 1 or 2
In paragraph 1, at least one of the cam grooves is provided as a curved groove on both of two annular members that are in sliding contact with each other, and a roller fitted across the overlapping portion of these cam grooves is provided with a groove of the corresponding cam groove. In a relative sliding ring of a lens barrel, in which an annular elastic part is provided that applies different elastic contact forces depending on the width, and a small diameter part smaller than both annular elastic parts is formed between these annular elastic parts. Structure that prevents rattling between the cam groove and roller.