JPS6384106U

JPS6384106U -

Info

Publication number: JPS6384106U
Application number: JP17761886U
Authority: JP
Priority date: 1986-11-20
Filing date: 1986-11-20
Publication date: 1988-06-02

Description

[Brief explanation of the drawing]

第１図は、本考案の第１実施例の構成を示すズ
ームレンズ鏡筒の長焦点状態と短焦点状態を上半
部と下半部に分けて示す断面図、第２図は、第１
図中に示される固定鏡筒と回転カム枠の関係を示
す展開図、第３図は、短焦点位置と長焦点位置の
ピントズレ量を示す線図、第４図は、第１図中に
示されるシフト調整のための機構の要部を分解し
て示す斜視図、第５図は、第１図の―線矢視
方向断面を簡略化して示す断面図、第６図は、本
考案の第２実施例を示すズームレンズ鏡筒のシフ
ト調整構造の要部を示す斜視図、第７図Ａは、本
考案の第３実施例を示すズームレンズ鏡筒のシフ
ト調整構造の要部を示す断面図、第７図Ｂは、第
７図Ａ中に示される第１の固定部材の斜視図、第
８図および第９図は、従来のズームレンズ鏡筒の
一例の要部を示す展開図および拡大断面図、第１
０図は、他の従来の例を示す断面図である。２０……レンズマウント部、２１……固定鏡筒
、２１ａ，２１ｂ，２１ｃ……直線カム溝、２２
……回転カム枠、２２ａ，２２ｂ，２２ｃ……カ
ム溝、２２ｄ……位置規制部、２３……回転ヘリ
コイド、２４……第２群レンズ枠、２５，２６…
…第２群レンズ、２８……第３群レンズ枠、３０
……第１群レンズ枠、３３……距離調整リング、
３４……ズームリング、３６……絞り指標リング
、３７……カム固定部材、３８……スペーサー、
４０，４１，４２……ピン、５０……第１の固定
部材、５０ａ……調整用長孔、５１……第２の固
定部材、５２……固定ネジ、６０……位置規制部
、８０……位置規制部、８１……第１の固定部材
、８２……第２の固定部材、８２ａ……長孔、８
３……固定ネジ。 FIG. 1 is a cross-sectional view showing the configuration of the first embodiment of the present invention, showing the long focus state and short focus state of the zoom lens barrel divided into an upper half and a lower half, and FIG.
FIG. 3 is a developed view showing the relationship between the fixed lens barrel and the rotating cam frame shown in the figure, FIG. FIG. 5 is an exploded perspective view showing the main parts of the shift adjustment mechanism according to the present invention; FIG. 5 is a simplified cross-sectional view of FIG. FIG. 7A is a perspective view showing the main parts of the shift adjustment structure for a zoom lens barrel according to the second embodiment, and FIG. 7A is a cross-sectional view showing the main parts of the shift adjustment structure for the zoom lens barrel according to the third embodiment of the present invention. 7B is a perspective view of the first fixing member shown in FIG. 7A, and FIGS. 8 and 9 are exploded views showing essential parts of an example of a conventional zoom lens barrel. Enlarged sectional view, 1st
FIG. 0 is a sectional view showing another conventional example. 20...Lens mount part, 21...Fixed lens barrel, 21a, 21b, 21c...Linear cam groove, 22
... Rotating cam frame, 22a, 22b, 22c... Cam groove, 22d... Position regulating portion, 23... Rotating helicoid, 24... Second group lens frame, 25, 26...
...Second group lens, 28...Third group lens frame, 30
...First group lens frame, 33...Distance adjustment ring,
34...Zoom ring, 36...Aperture index ring, 37...Cam fixing member, 38...Spacer,
40, 41, 42...Pin, 50...First fixing member, 50a...Elongated hole for adjustment, 51...Second fixing member, 52...Fixing screw, 60...Position regulating part, 80... ...Position regulating portion, 81...First fixing member, 82...Second fixing member, 82a...Long hole, 8
3...Fixing screw.

Claims

[Scope of utility model registration request]

a fixed lens barrel into which a plurality of movable frames that support lenses forming a zoom lens optical system are fitted;
a rotating cam frame that rotatably fits into the fixed lens barrel, and by rotating the rotating cam frame, the plurality of movable frames are selectively moved in the optical axis direction with respect to the fixed lens barrel. In the zoom lens barrel, the rotating cam frame has a position regulating portion formed of a circumferential groove or a circumferential stepped portion formed on the outer periphery near one end, and the one end side only allows rotation of the rotating cam frame. a cam fixing member that is engaged with the position regulating portion and whose other end is fixed to the fixed lens barrel; and an adjusting member that is inserted between the one end of the cam fixing member and the fixed lens barrel. A zoom lens barrel, characterized in that the adjusting member is configured to finely adjust the position of the rotary cam frame in the optical axis direction with respect to the fixed lens barrel.