JPS59178607U - Lens barrel light shielding device - 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) [Summary] 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 drawings]

第１図は、従来のズームレンズ鏡筒の一例を示す上半部
の断面図、第２図は、上記第１図のズームレンズ鏡筒の
操作枠、固定枠、ズーミング枠におけるリードカム孔と
保合ピンとの係合状態を示す展開図、第３図は、上記第
１図のズームレンズ鏡筒における各レンズ群の動きを示
す線図、第４〜６図は、ズームレンズ鏡筒における遮光
装置の例を夫々示す断面図、第７図は、カメラ内フィル
ム画面枠に対する有効光線の範囲を示す線図、第８図は
、本考案の一実施例を示すレンズ鏡筒の遮光装置の分解
斜視図、第９図は、上記第８図のレンズ鏡筒の遮光装置
の上半部の断面図、第１０図は、上記第９図中のＡ−Ａ
線に沿う断面図である。 ０１・・・・・・レシズ鏡筒、５１・・曲レンズ鏡筒の
遮光装置、５２・・・・・・レンズ枠、５２ｂ・・・・
・・嵌合部、５３・・・・・・支持枠、５４・・・・・
・切欠部、５５・・・・・・遮光板、５６・・・・・・
遮光板嵌入孔。 馬２区 蔦３区FIG. 1 is a cross-sectional view of the upper half of an example of a conventional zoom lens barrel, and FIG. 2 shows the lead cam hole and retainer in the operating frame, fixed frame, and zooming frame of the zoom lens barrel shown in FIG. FIG. 3 is a diagram showing the movement of each lens group in the zoom lens barrel shown in FIG. 1, and FIGS. 4 to 6 show the light blocking device in the zoom lens barrel. 7 is a line diagram showing the range of effective light rays relative to the film screen frame in the camera, and FIG. 8 is an exploded perspective view of a light shielding device for a lens barrel showing an embodiment of the present invention. 9 is a cross-sectional view of the upper half of the light shielding device of the lens barrel shown in FIG. 8, and FIG. 10 is a sectional view taken along line A-A in FIG.
It is a sectional view along a line. 01...Less lens barrel, 51...Shading device for curved lens barrel, 52...Lens frame, 52b...
...Mating portion, 53...Support frame, 54...
・Notch, 55... Light shielding plate, 56...
Light shielding plate insertion hole. Uma 2nd Ward Tsuta 3rd Ward

Claims (1)

【実用新案登録請求の範囲】 レンズ鏡筒内に光軸方向に進退自在に嵌合するレンズ枠
を有するレンズ鏡筒において、内周面に内面反射防止処
理が施され、光軸方向にはＳ゛等間隔に切欠かれた４個
の切欠部を有する支持枠と、 この支持枠の基板上に、上記４個の切欠部に相対する軸
芯寄り位置に、上記切欠部に平行して設けられた、断面
形状が部分用弧状の４枚の遮光板と、 上記レンズ枠の外周面上に突出して、上記支持枠の４個
の切欠部に夫々嵌合する４個の嵌合部と、上記レンズ枠
の４個の嵌合部の軸芯寄り位置に、上記嵌合部と平行し
て貫通して設けられていて、上記支持枠の４枚の遮光板
が夫々緩く嵌入する、断面形状が部分円弧状の遮光板嵌
入孔と、を具備し、上記レンズ枠の上記支持枠内での進
退に際し、入射する被写体光のカメラ内フィルム画面枠
に向けての有効光線の上記支持枠内周面による反射光を
遮断するようにしたことを特徴とするレンズ鏡筒の遮光
装置。[Claims for Utility Model Registration] In a lens barrel having a lens frame that fits into the lens barrel so as to move forward and backward in the optical axis direction, the inner peripheral surface is subjected to internal anti-reflection treatment, and the optical axis direction is S ``A support frame having four notches cut out at equal intervals, and a support frame provided on the substrate of this support frame at a position near the axis opposite to the four notches and parallel to the abovementioned notches. Further, four light shielding plates having a partial arc cross-sectional shape; four fitting portions protruding from the outer circumferential surface of the lens frame and fitting into the four notches of the support frame, respectively; A cross-sectional shape is provided at a position close to the axis of the four fitting portions of the lens frame so as to penetrate in parallel with the fitting portion, and into which each of the four light shielding plates of the support frame is loosely fitted. a partial arc-shaped light-shielding plate insertion hole, which directs effective rays of incident subject light toward the film screen frame in the camera on the inner peripheral surface of the support frame when the lens frame moves back and forth within the support frame; A light shielding device for a lens barrel, characterized in that it blocks reflected light caused by.