JPH0371332U

JPH0371332U -

Info

Publication number: JPH0371332U
Application number: JP13166189U
Authority: JP
Priority date: 1989-11-14
Filing date: 1989-11-14
Publication date: 1991-07-18

Description

[Brief explanation of the drawing]

第１図は本考案に係るバリア開閉機構の一実施
例を示すバリア付き沈胴式カメラのレンズ鏡胴部
分の概略分解斜視図、第２図および第３図はバリ
アの開閉動作を説明するためのレンズ鏡胴前面部
から見た概略構成図、第４図は本考案を特徴づけ
るカムレバーとカム面との関係を示す説明図、第
５図ａ，Ｂはその係合位置が変化したときの作用
力関係を示す説明図、第６図および第７図ａ，ｂ
はカム面が単純な傾斜面である従来構造の場合の
不具合を説明するための概略説明図、第８図ａ，
ｂ，ｃは沈胴式カメラのレンズ鏡胴の繰出し、繰
込み動作を説明するための概略図である。１０……レンズ鏡胴、１１……バリア駆動リン
グ、１１ｂ……係合爪、１２……バリア、１２ａ
……回動軸、１１ｂ……係合ピン、１４……カム
レバー、１５……暗箱（カメラボデイ）、１６…
…バリア開閉カム、１６ａ……カム面、１７……
ばね、１８……巻きばね、２１……電動モータ（
鏡胴駆動系）。 FIG. 1 is a schematic exploded perspective view of the lens barrel of a retractable camera with a barrier, showing one embodiment of the barrier opening/closing mechanism according to the present invention, and FIGS. 2 and 3 are diagrams for explaining the opening/closing operation of the barrier. A schematic diagram of the configuration seen from the front of the lens barrel, Figure 4 is an explanatory diagram showing the relationship between the cam lever and the cam surface, which characterizes the present invention, and Figures 5a and B show the effect when the engagement position changes. Explanatory diagrams showing force relationships, Figures 6 and 7 a, b
is a schematic explanatory diagram for explaining the problem in the case of the conventional structure in which the cam surface is a simple inclined surface, FIG. 8a,
b and c are schematic diagrams for explaining the extending and retracting operations of the lens barrel of the collapsible camera. 10... Lens barrel, 11... Barrier drive ring, 11b... Engaging claw, 12... Barrier, 12a
...Rotation axis, 11b...Engagement pin, 14...Cam lever, 15...Dark box (camera body), 16...
...Barrier opening/closing cam, 16a...Cam surface, 17...
Spring, 18... Winding spring, 21... Electric motor (
lens barrel drive system).

Claims

[Scope of utility model registration request]

A cam lever is provided to open and close a lens protection barrier that selectively covers the front surface of the photographic lens, and is normally biased by a spring to rotate in the direction of the barrier opening operation. a barrier opening/closing cam provided on the camera body side having a cam surface that engages the cam lever and opens/closes the barrier by the movement of the barrier opening/closing cam, and the cam surface of the barrier opening/closing cam acts on the cam lever. A barrier opening/closing mechanism characterized in that the barrier opening/closing mechanism is formed in a shape obtained based on the biasing force of a spring so that the angle of inclination is large where the biasing force of the spring is large and the angle of inclination is small where the biasing force is small.