JPH0442613U

JPH0442613U -

Info

Publication number: JPH0442613U
Application number: JP1990084338U
Authority: JP
Priority date: 1990-08-08
Filing date: 1990-08-08
Publication date: 1992-04-10
Anticipated expiration: 2005-08-08
Also published as: JP2535052Y2

Description

[Brief explanation of the drawing]

第１Ａ〜１Ｅ図は本考案のズームレンズ鏡筒の
組立工程を示す展開図である。第２図、第３図は
前群レンズ筒と後群レンズ枠の直進案内機構を示
す要部の分解斜視図である。第４図は本考案のレ
ンズ鏡筒全体の縦断面図であつて、上半分はレン
ズ収納状態、下半分はレンズ突出状態（テレ状態
）を示している。第５図は前群レンズ筒、後群レ
ンズ枠、およびカム環の関係を示す要部の拡大断
面図である。第６図は主要要素の分解斜視図であ
る。第７図はカム環、遮光環、および前群レンズ
筒の関係を示す要部の分解斜視図である。１０……カム環（ヘリコイド体）、１０ａ……
雄ヘリコイド、１０ｂ……雌ヘリコイド、１０ｃ
……インナカム溝、１０ｐ……回動範囲規制突起
、１１……固定鏡筒、１１ａ……直進案内溝、１
２……ヘリコイド環、１２ａ……雌ヘリコイド、
１３……前群レンズ筒（移動レンズ枠）、１３ａ
……雄ヘリコイド、１３ｃ……シヤツタ保持枠、
１３ｄ……直進溝（直進案内環１５用）、１３ｅ
……直進溝（後群レンズ枠１８用）、１３ｆ，１
３ｇ……キー突起（溝壁）、１４……直進案内板
、１５……直進案内環、１５ａ……直進キー、１
５ｂ……環状溝、１６……シヤツタユニツト、１
７……ヘリコイド環、１８……前群レンズ枠、１
９……後群レンズ枠、１９ａ……カムローラ。 1A to 1E are exploded views showing the assembly process of the zoom lens barrel of the present invention. FIGS. 2 and 3 are exploded perspective views of essential parts showing a linear guide mechanism for the front group lens barrel and the rear group lens frame. FIG. 4 is a vertical sectional view of the entire lens barrel of the present invention, with the upper half showing the lens in the retracted state and the lower half showing the lens in the protruding state (telephoto state). FIG. 5 is an enlarged sectional view of essential parts showing the relationship among the front group lens barrel, the rear group lens frame, and the cam ring. FIG. 6 is an exploded perspective view of the main elements. FIG. 7 is an exploded perspective view of essential parts showing the relationship between the cam ring, the light shielding ring, and the front group lens barrel. 10...Cam ring (helicoid body), 10a...
Male helicoid, 10b...Female helicoid, 10c
...Inner cam groove, 10p... Rotation range regulating protrusion, 11... Fixed lens barrel, 11a... Straight guide groove, 1
2... Helicoid ring, 12a... Female helicoid,
13... Front group lens barrel (moving lens frame), 13a
...Male helicoid, 13c...Shutter holding frame,
13d...straight groove (for straight guide ring 15), 13e
...straight groove (for rear group lens frame 18), 13f, 1
3g... Key protrusion (groove wall), 14... Straight guide plate, 15... Straight guide ring, 15a... Straight key, 1
5b...Annular groove, 16...Shutter unit, 1
7... Helicoid ring, 18... Front group lens frame, 1
9... Rear group lens frame, 19a... Cam roller.

Claims

[Claims for Utility Model Registration] (1) A rotationally driven cam ring having a helicoid or cam groove; A movable lens frame having a helicoid or cam pin that engages with the helicoid or cam groove of this cam ring; In a zoom lens barrel having a linear guide member for linearly guiding a movable lens frame, the linear guide member is provided with a linear key whose front end is open and extends in a direction parallel to the optical axis; A straight groove that engages from the front end of the straight key is provided so that when the helicoid or cam groove of the cam ring is engaged with the helicoid or cam pin of the movable lens frame, the straight key and the straight groove are engaged at the same time. A zoom lens barrel that is characterized by: (2) In claim 1, when the cam ring is assembled,
A zoom lens barrel that can be further rotated from the end of a normal zooming section, and in this rotational position during assembly, a straight key and a straight groove engage. (3) In claim 2, the cam ring and the movable lens frame are each provided with a helicoid that screws into each other, and the pair of groove walls of the linear groove that engages with the linear key are in the rotational position when the cam ring is assembled. , a zoom lens barrel in which only one of the groove walls engages with the straight forward key, and when the cam ring is then rotated to the normal zooming section side, the other groove wall also engages with the straight forward key.