JPH01171412U

JPH01171412U -

Info

Publication number: JPH01171412U
Application number: JP6494788U
Authority: JP
Priority date: 1988-05-16
Filing date: 1988-05-16
Publication date: 1989-12-05
Anticipated expiration: 2003-05-16
Also published as: JP2525776Y2

Description

[Brief explanation of drawings]

第１図〜第４図は本考案の一実施例を示し、第
１図および第２図は撮影レンズがワイド端および
テレ端にある場合のズームレンズ鏡筒を、第３図
は撮影レンズが沈胴位置にある場合のズームレン
ズ鏡筒をそれぞれ示す説明図であり、ａがレンズ
鏡筒の縦断面、ｂがそのｂ−ｂ線断面を示す。第
４図ａ〜ｃは、撮影レンズのテレ端位置、ワイド
端位置、沈胴位置の状態を説明する図である。３：前群レンズ保持筒、４：キー、５：カム筒
、５ａ：カムフオロア、６：後群レンズ保持筒、
６ａ：カムフオロア、１１：圧縮ばね、１２：引
張りばね、４０：溝部、４１：カム溝、４２：平
行溝、５０：溝部、５１：カム溝、５２：沈胴用
開口。 Figures 1 to 4 show an embodiment of the present invention. Figures 1 and 2 show the zoom lens barrel when the taking lens is at the wide end and telephoto end, and Figure 3 shows the zoom lens barrel when the taking lens is at the wide end and telephoto end. FIG. 3 is an explanatory diagram showing the zoom lens barrel in a collapsed position, in which a shows a longitudinal cross section of the lens barrel, and b shows a cross section taken along the line bb--b. FIGS. 4a to 4c are diagrams illustrating the states of the photographic lens at the telephoto end position, wide end position, and collapsing position. 3: Front group lens holding tube, 4: Key, 5: Cam tube, 5a: Cam follower, 6: Rear group lens holding tube,
6a: cam follower, 11: compression spring, 12: tension spring, 40: groove, 41: cam groove, 42: parallel groove, 50: groove, 51: cam groove, 52: collapsible opening.

Claims

[Scope of Claim for Utility Model Registration] A photographic lens consisting of a front group lens and a rear group lens, which is driven by a drive motor and moves between a collapsed position located further inside the camera body than the wide end position and a telephoto end position. The zoom lens barrel is configured to change the focal length by adjusting the distance between the front group lens and the rear group lens, the front lens barrel having a cam groove corresponding to from the wide end to the telephoto end and holding the front group lens. A rear group lens holding tube comprising: a cam tube that rotates and moves in the optical axis direction as the group lens holding tube moves in the optical axis direction; and a cam follower that holds the rear group lens and engages with the cam groove. When the cam cylinder rotates and moves in the optical axis direction, the rear group lens holding cylinder moves in the optical axis direction while changing the distance from the front group lens holding cylinder by engaging the cam groove and the cam follower. and a limiting member that comes into contact with the rear group lens holding cylinder when the photographing lens is retracted to the wide end to limit further retraction of the rear group lens holding cylinder, and the cam groove is wide. A collapsible opening that extends toward the front of the camera along the optical axis is provided on the end side, and when the front group lens holding tube at the wide end is further retracted, the rear group lens holding tube comes into contact with the limiting member. The zoom lens is configured such that the cam follower moves relatively within the collapsible opening so that the photographing lens moves to the collapsible position by retracting the front group lens holding cylinder. lens barrel.