JPS6434607U - - Google Patents

Description

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

図面は本考案の実施例を示し、第１図はズーム
レンズ鏡胴の縦断側面図、第２図は同ズームレン
ズ鏡胴の横断平面図、第３図は同ズームレンズ鏡
胴の分解斜視図、第４図はカム筒の展開図、第５
図は移動筒とカム筒を省略した第１図上のＡ―Ａ
線縮小断面図、第６図は固定枠の部分的な斜視図
、第７図は第１図上のＡ―Ａ線縮小断面図、第８
図はカム筒の正面図、第９図及び第１０図はカム
フオロア部分を示す部分図で、第９図はカムフオ
ロアがカム筒の凹溝を通つてガイド孔部に位置し
ている状態を、第１０図はカムフオロアがカム筒
のカム孔に位置している状態を各々示す断面図、
第１１図は広角位置から望遠位置に移行した状態
を示す上記ズームレンズ鏡胴の縦断側面図、第１
２図は他の実施例を示すズームレンズ鏡胴の断面
図、第１３図は第１２図実施例に備えたカム筒の
正面図、第１４図は第１３図上のＢ―Ｂ線断面図
である。 １１……固定枠、１１ａ，１１ｂ……案内溝、
１１ｃ，１１ｄ……切欠孔、１２……移動筒、１
２ａ，１２ｂ……案内孔、１３……移動枠、１３
ａ，１３ｂ……円曲面部、１４……カム筒、１４
ａ，１４ｂ……被板部、１４ａ_１，１４ｂ_１……
カム面平行壁、１４ｃ，１４ｄ……フランジ部、
１４ｅ……歯車部、１４ｊ，１４ｋ……凹溝、１
７ａ，１７ｂ……カムフオロア、２６ａ，２６ｂ
……カムフオロア、３１，３２……一方側カム孔
、３３，３４……他方側カム孔、４０……カム筒
。 The drawings show an embodiment of the present invention, in which Fig. 1 is a vertical cross-sectional side view of the zoom lens barrel, Fig. 2 is a cross-sectional plan view of the zoom lens barrel, and Fig. 3 is an exploded perspective view of the zoom lens barrel. , Figure 4 is a developed view of the cam cylinder, Figure 5
The figure is A-A in Figure 1 with the movable cylinder and cam cylinder omitted.
6 is a partial perspective view of the fixed frame, FIG. 7 is a reduced sectional view taken along the line A--A in FIG. 1, and FIG.
The figure is a front view of the cam cylinder, and Figures 9 and 10 are partial views showing the cam follower. Figure 9 shows the state in which the cam follower is located in the guide hole through the groove of the cam cylinder. Figure 10 is a cross-sectional view showing the state in which the cam follower is located in the cam hole of the cam cylinder,
FIG. 11 is a longitudinal sectional side view of the zoom lens barrel showing the state in which it has shifted from the wide-angle position to the telephoto position;
Fig. 2 is a sectional view of a zoom lens barrel showing another embodiment, Fig. 13 is a front view of a cam barrel provided in the embodiment shown in Fig. 12, and Fig. 14 is a sectional view taken along line BB in Fig. 13. It is. 11... fixed frame, 11a, 11b... guide groove,
11c, 11d... Notch hole, 12... Moving tube, 1
2a, 12b... Guide hole, 13... Moving frame, 13
a, 13b...Circular curved surface portion, 14...Cam cylinder, 14
a, 14b...covered part, 14a ₁ , 14b ₁ ...
Cam surface parallel wall, 14c, 14d...flange part,
14e...Gear portion, 14j, 14k...Concave groove, 1
7a, 17b...cam follower, 26a, 26b
...Cam follower, 31, 32... One side cam hole, 33, 34... Other side cam hole, 40... Cam tube.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] カム筒のカム面に対接させたカムフオロアを備
えた移動枠がカム筒の回動に連動されて移動し、
この移動枠に支持されたレンズを位置変化させて
光学的に変倍する構成のズームレンズ鏡胴におい
て、上記カム筒を合成樹脂材で形成すると共に、
このカム筒には、ズーミングに必要なカム孔の他
に、このカム孔を延長させたガイド孔部と、カム
筒の一端より上記ガイド孔部に連通させるように
カム筒内面に形成した凹溝とを設け、上記移動枠
に予め固着したカムフオロアを上記凹溝を通して
ガイド孔部に移行させるようにしてカム筒内に移
動枠を組み込んだ後、カム筒のズーミング回動範
囲を定めて上記カムフオロアを上記カム孔のカム
面に対接させる構成としたことを特徴とするズー
ムレンズ鏡胴。 A moving frame equipped with a cam follower placed in contact with the cam surface of the cam cylinder moves in conjunction with the rotation of the cam cylinder,
In the zoom lens barrel configured to optically change the magnification by changing the position of the lens supported by the movable frame, the cam barrel is formed of a synthetic resin material, and
In addition to the cam hole necessary for zooming, this cam cylinder has a guide hole that is an extension of the cam hole, and a groove formed on the inner surface of the cam cylinder so that one end of the cam cylinder communicates with the guide hole. The cam follower, which has been fixed in advance to the movable frame, is moved into the guide hole through the concave groove, and the movable frame is assembled into the cam cylinder.Then, the zooming rotation range of the cam cylinder is determined, and the cam follower is moved to the guide hole portion through the groove. A zoom lens barrel characterized in that it is configured to be brought into contact with a cam surface of the cam hole.