JPH02142807U

JPH02142807U -

Info

Publication number: JPH02142807U
Application number: JP5230689U
Authority: JP
Priority date: 1989-05-02
Filing date: 1989-05-02
Publication date: 1990-12-04

Description

[Brief explanation of drawings]

第１図および第２図は本考案によるズームレン
ズの変倍機構の一実施例を示す図であり、第１図
はズームレンズの変倍機構の全体構成図、第２図
ａはカム従動子の先端部の側面図および下面図、
同図ｂはカム従動子とカム溝との嵌合部の側面断
面図および下面図、第３図は本考案の他の実施例
を示す図であり、第３図ａはカム従動子の先端部
の側面図および下面図、同図ｂはカム従動子とカ
ム溝との嵌合部の側面断面図および下面図、第４
図および第５図は従来のズームレンズの変倍機構
を示す図であり、第４図はズームレンズの変倍機
構の全体構成図、第５図ａはカム従動子とカム溝
との嵌合部の側面断面図、同図ｂは同じくカム従
動子とカム溝との嵌合部の下面図である。１……カム板部材（カム部材）、１ａ，１ｂ，
１ｃ，１ｄ……カム溝、２，３，４，５……レン
ズ、２ａ，３ａ，４ａ，５ａ……カム従動子、２
ｂ……割り溝、１０……ズームレンズ、Ａ……光
軸。 1 and 2 are diagrams showing an embodiment of the variable power mechanism of a zoom lens according to the present invention, FIG. 1 is an overall configuration diagram of the variable power mechanism of a zoom lens, and FIG. 2a is a cam follower. Side and bottom views of the tip of the
Fig. 3b is a side sectional view and a bottom view of the fitting part between the cam follower and the cam groove, Fig. 3 is a view showing another embodiment of the present invention, and Fig. 3a is the tip of the cam follower. FIG.
5 and 5 are diagrams showing a conventional zoom lens variable power mechanism, FIG. 4 is an overall configuration diagram of the zoom lens variable power mechanism, and FIG. 5 a shows the fitting of a cam follower and a cam groove. Figure b is a bottom view of the fitting part between the cam follower and the cam groove. 1...Cam plate member (cam member), 1a, 1b,
1c, 1d...Cam groove, 2, 3, 4, 5... Lens, 2a, 3a, 4a, 5a... Cam follower, 2
b...Split groove, 10...Zoom lens, A...Optical axis.

Claims

[Scope of utility model registration request]

a zoom lens having a plurality of lenses, each of which is provided with a cam follower; and a cam member that has a cam groove in which the cam follower fits and moves in a direction oblique to the optical axis of the zoom lens. The cam follower moves along the cam groove when moving the zoom lens in the optical axis direction via the cam follower to change the imaging magnification by moving the cam member. In a variable power mechanism for a zoom lens that changes a focal length by changing an interval between each of the plurality of lenses by moving relative to a cam member, a side of the cam follower that fits into the cam groove. A split groove is formed in the end portion of the cam groove in a direction substantially parallel to the cam groove, and the end portion is fitted into the cam groove while being elastically deformed so that the diameter is reduced in a direction perpendicular to the split groove. The zoom lens features a variable power mechanism.