JPH02128111U

JPH02128111U -

Info

Publication number: JPH02128111U
Application number: JP3787889U
Authority: JP
Priority date: 1989-03-31
Filing date: 1989-03-31
Publication date: 1990-10-23
Anticipated expiration: 2004-03-31
Also published as: JPH0753056Y2

Description

[Brief explanation of the drawing]

第１Ａ図、第１Ｂ図、第１Ｃ図は、本考案のバ
リヤ開閉装置を有するズームレンズの実施例を示
すもので、それぞれ収納状態、最短焦点距離状態
、最長焦点距離状態を示す上半断面図である。第
２図は、第１Ａ〜１Ｃ図のズームレンズをスケル
トンで概略的に描いたスケルトン図である。第３
図は、カム環のカム溝と、直進環の直進ガイド溝
、および第１〜第３レンズ群のレンズ群の１群ロ
ーラ〜３群ローラの関係を示す展開図、第４図は
、第３レンズ枠と第２レンズ移動環の関係を示す
展開図、第５図は、第３レンズ枠単体の斜視図、
第６図は、バリフオーカルズームレンズ、および
本考案によるズーミング調整方法の基本原理を示
す光学軌跡図である。Ａ……第１レンズ群、Ｂ……第２レンズ群、Ｃ
……第３レンズ群、Ａ′……１群ローラ、Ｂ′…
…２群ローラ、Ｃ′……３群ローラ、１１……固
定環、１２……外側ヘリコイド、１３……内側ヘ
リコイド、１４……カム環、１５……ギヤ、１６
……ズームモータ、１７……前カバー、１８……
直進環、１９……直進案内板、２２……第１レン
ズ枠、２２ａ……調整ねじ、２３……第１レンズ
移動環、２３ａ……一体移動係合部、２５……第
２レンズ枠、２６……シヤツタブロツク、２７…
…内周ヘリコイド、２８……第２レンズ移動環、
３０……第３レンズ枠、３０ａ……一体移動係合
部、３０ｂ……テーパ面（カム面）、３１……圧
縮ばね、３３……連結環。 1A, 1B, and 1C are upper half cross-sectional views showing an embodiment of a zoom lens having a barrier opening/closing device of the present invention, showing a stored state, a shortest focal length state, and a longest focal length state, respectively. It is. FIG. 2 is a skeleton diagram schematically depicting the zoom lens shown in FIGS. 1A to 1C. Third
The figure is a developed view showing the relationship between the cam groove of the cam ring, the linear guide groove of the linear ring, and the first to third group rollers of the first to third lens groups. A developed view showing the relationship between the lens frame and the second lens moving ring, FIG. 5 is a perspective view of the third lens frame alone,
FIG. 6 is an optical trajectory diagram showing the basic principle of the varifocal zoom lens and the zooming adjustment method according to the present invention. A...First lens group, B...Second lens group, C
...Third lens group, A'...1st group roller, B'...
...2nd group roller, C'...3rd group roller, 11...fixed ring, 12...outer helicoid, 13...inner helicoid, 14...cam ring, 15...gear, 16
...Zoom motor, 17...Front cover, 18...
Straight ring, 19... Straight guide plate, 22... First lens frame, 22a... Adjustment screw, 23... First lens moving ring, 23a... Integral movement engagement part, 25... Second lens frame, 26...Shutter block, 27...
...Inner helicoid, 28...Second lens moving ring,
30... Third lens frame, 30a... Integrally movable engaging portion, 30b... Tapered surface (cam surface), 31... Compression spring, 33... Connection ring.

Claims

[Claims for Utility Model Registration] (1) A fixed ring; a cam ring rotatably supported by the fixed ring; at least two cam grooves formed in the cam ring; A zooming section formed respectively and a storage section formed continuously at one end of this zooming section;
A first lens group and a third lens group whose movement position in the zooming section is determined by one of the cam grooves of the book; a second lens whose movement position is determined by the other cam groove; group; an integral movement engagement portion provided on both lens groups that engages in the zooming section of the cam groove and moves the first lens group and the third lens group together; A zoom lens barrel comprising: an approach means for restricting the retreat of the three lens groups and bringing the first and second lens groups closer to the third lens group. (2) The zoom lens barrel according to claim 1, wherein the retracted position of the third lens is limited by a rectilinear guide groove formed in the rectilinear ring. (3) In claim 1, the integrally movable engaging portion of the first lens group and the third lens group engages with the third lens frame while the first lens group transitions from the storage section to the zooming section. A zoom lens barrel that integrates the two. (4) In claim 1, a spring means is interposed between the second lens group and the third lens group for biasing the third lens group to move rearward, and this spring means:
A zoom lens barrel that simultaneously moves and biases the integrally movable engaging portion of the third lens group toward the integrally movable engaging portion of the first lens group. (5) A zoom lens barrel that controls the movement positions of at least three front and rear lens groups by rotating a cam ring having a zooming section and a storage section,
In the zoom lens barrel, two of the lens groups move together in the zooming section, and in the storage section, the integral movement relationship between the two lens groups is broken, and the front lens group is moved to the rear lens. A zoom lens barrel that is characterized by being close to the group.