JPS59116915U - zoom lens barrel - Google Patents

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本考案の一実施例のズームレンズ鏡筒の断面図
、第２図は本実施例についての各レンズ群の移動の様子
を説明する図、第３図は広角端に設定したときの各部の
位置関係を示す展開図、第４図は望遠端に設定したとき
の各部の位置関係を示す展開図である。 〔主要部分の符号の説明〕、Ｇ□・・・第ルンズｉＪ、
Ｇ’・・・第２レンズ群、Ｇ３１．Ｇ３２・・・第３レ
ンズ群、１・・・固定筒、４．　５．　６．　８・・・
可動保持部材、９・・・カム筒。Figure 1 is a cross-sectional view of a zoom lens barrel according to an embodiment of the present invention, Figure 2 is a diagram explaining the movement of each lens group in this embodiment, and Figure 3 is when set at the wide-angle end. FIG. 4 is a developed view showing the positional relationship of each part when the telephoto end is set. [Explanation of symbols of main parts], G□... No. Runs iJ,
G'...Second lens group, G31. G32...Third lens group, 1...Fixed barrel, 4. 5. 6. 8...
Movable holding member, 9... cam cylinder.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 物体側から順に配設された正屈折力の第ルンズ群、負屈
折力の第２レンズ群、正屈折力の第３レンズ群と；合焦
操作に応じて前記第ルンズ群を光軸方向に変位させる合
焦駆動系と；変位操作に応じて前記各レンズ群を共に光
軸に沿って同一、　　方向に変位させる変倍駆動系とを
有し、該変倍駆動系は広角端から望遠端への変倍操作に
応じて前記各レンズ群を共に物体側へ変位させることを
特徴とするズームレンズ鏡筒。A first lens group with positive refractive power, a second lens group with negative refractive power, and a third lens group with positive refractive power are arranged in order from the object side; a focusing drive system for displacing; and a variable power drive system for displacing each lens group in the same direction along the optical axis in response to a displacement operation, and the variable power drive system moves from a wide-angle end to a telephoto end A zoom lens barrel characterized in that each of the lens groups is displaced toward an object side in response to a zooming operation.