JPH025713U

JPH025713U -

Info

Publication number: JPH025713U
Application number: JP1988083593U
Authority: JP
Priority date: 1988-06-24
Filing date: 1988-06-24
Publication date: 1990-01-16
Anticipated expiration: 2003-06-24
Also published as: JPH0618325Y2

Description

[Brief explanation of drawings]

第１図ないし第３図は本考案のズームレンズ鏡
筒の実施例を示す上半断面図で、第１図は収納状
態、第２図はワイド端状態、第３図はテレ端状態
をそれぞれ示す図、第４図はカム環、レンズ案内
環およびカム環ヘリコイドを回動位置検出機構と
ともに示す展開図、第５図はブラシの固定状態の
一例をを示す外側ヘリコイドの斜視図、第６図は
コード板の展開図である。１１……カメラボデイ、１２……固定筒、１５
，１６……移動レンズ、１８……外側ヘリコイド
（内周ヘリコイド）、２０……内側ヘリコイド（
外周ヘリコイド）、２２……カム環、２４……レ
ンズ案内環、２６……直進案内板、２７……レン
ズ案内環ガイド溝、３０……前群レンズ枠、３１
……後群レンズ枠、３２……シヤツタブロツク、
３３……ヘリコイドリング、３４……前群移動枠
、３５，３６……ガイドピン、４１……前群カム
溝、４２……後群カム溝、４３，４４……レンズ
ガイド溝、４５……コード板、４７……ブラシ固
定凹部、４８……ブラシ、４９……基部、５０…
…フレキシブル基板、５１……制御基板。 Figures 1 to 3 are upper half cross-sectional views showing an embodiment of the zoom lens barrel of the present invention, in which Figure 1 shows the stored state, Figure 2 shows the wide end state, and Figure 3 shows the telephoto end state. FIG. 4 is a developed view showing the cam ring, lens guide ring, and cam ring helicoid together with a rotating position detection mechanism; FIG. 5 is a perspective view of the outer helicoid showing an example of the fixed state of the brush; FIG. 6 is a developed view of the code board. 11...Camera body, 12...Fixed barrel, 15
, 16...Moving lens, 18...Outer helicoid (inner helicoid), 20...Inner helicoid (
outer circumferential helicoid), 22... cam ring, 24... lens guide ring, 26... linear guide plate, 27... lens guide ring guide groove, 30... front group lens frame, 31
... Rear group lens frame, 32 ... Shutter block,
33... Helicoid ring, 34... Front group moving frame, 35, 36... Guide pin, 41... Front group cam groove, 42... Rear group cam groove, 43, 44... Lens guide groove, 45... Code plate, 47...Brush fixing recess, 48...Brush, 49...Base, 50...
...Flexible board, 51...Control board.

Claims

[Claims for Utility Model Registration] (1) A cam ring is supported on the fixed barrel so as to be rotatably movable in the optical axis direction as it rotates, and a cam ring that moves integrally with the cam ring in the optical axis direction. , and a lens guide ring that rotates relative to the cam ring as the cam ring moves in the optical axis direction, and the lens guide ring and the cam ring each have cam grooves and lens guides for at least two front and rear moving lens groups. A groove is provided, and a guide pin is provided in the two groups of front and rear movable lenses, the guide pin being inserted across both the cam groove and the lens guide groove,
A lens barrel in which a cam groove and a lens guide groove are shaped to move the front and rear movable lens along a predetermined trajectory by a combined movement of the optical axis direction movement and relative rotation of the cam ring and the lens guide ring. A zoom lens barrel further comprising a rotational position detection mechanism between the fixed barrel and the cam ring for detecting the relative rotational position of the lens guide ring and the cam ring. (2) In claim 1, the cam ring is coupled to the fixed cylinder via a helicoid, and the rotation position detection mechanism is a code plate fixed to the outer periphery of the cam ring at the same inclination angle as the peak of the helicoid. The zoom lens barrel consists of a brush fixed to the fixed barrel side that slides into contact with this code plate.