JPH0362308U

JPH0362308U -

Info

Publication number: JPH0362308U
Application number: JP12270289U
Authority: JP
Priority date: 1989-10-20
Filing date: 1989-10-20
Publication date: 1991-06-18

Description

[Brief explanation of drawings]

第１図は本考案の１実施例に係るレンズ鏡胴の
断面図、第２図は第１図に示すレンズ鏡胴の固定
鏡胴を外側から見た展開図、第３図は本考案の他
の実施例に係るレンズ鏡胴の断面図、第４図は第
３図に示すレンズ鏡胴の固定鏡胴を外側から見た
展開図。１…固定鏡胴、１ｂ，１ｃ…長溝、１ｄ，１ｅ
，１ｆ，１ｇ…有効カム面、２…回転鏡胴、２ａ
，２ｂ…レンズ駆動カム、２ｃ，２ｄ，２ｅ，２
ｆ…有効カム面、４，５…レンズ移動枠、６，７
…ピン部材、８…引つ張りバネ、９…圧縮バネ、
Ｌ_１，Ｌ_２，Ｌ_３，Ｌ_４…レンズ。 FIG. 1 is a sectional view of a lens barrel according to an embodiment of the present invention, FIG. 2 is a developed view of the fixed lens barrel of the lens barrel shown in FIG. 4 is a sectional view of a lens barrel according to another embodiment, and FIG. 4 is a developed view of the fixed barrel of the lens barrel shown in FIG. 3, viewed from the outside. 1... Fixed lens barrel, 1b, 1c... Long groove, 1d, 1e
, 1f, 1g...Effective cam surface, 2...Rotating lens barrel, 2a
, 2b... Lens drive cam, 2c, 2d, 2e, 2
f...Effective cam surface, 4, 5...Lens movement frame, 6, 7
...pin member, 8...tension spring, 9...compression spring,
_L1 , _L2 , _L3 , _L4 ...Lens.

Claims

[Claims for Utility Model Registration] (1) A fixed lens barrel in which a long groove for rotation retention is formed along the longitudinal direction; A rotary lens barrel in which a lens drive cam having a predetermined inclination angle with respect to the direction and the circumferential direction is formed, and a movable lens is inserted therein and supported so as to be movable in the optical axis direction along the inner peripheral surface of the rotary lens barrel. and a lens moving frame having a pin member whose rotation is regulated by the long groove and a sliding portion that follows the lens driving cam as the rotating lens barrel rotates, In a lens barrel configured to move the lens moving frame back and forth in the optical axis direction by rotating the lens barrel relative to a fixed lens barrel, the long groove and the lens driving cam each have one side. An effective cam surface is formed, and a tension spring is provided that tensions the pin member toward the effective cam surface of the long groove and also tensions the sliding portion toward the effective cam surface of the lens drive cam. lens barrel. (2) A fixed lens barrel in which a long groove for retaining rotation is formed along the longitudinal direction; A rotary lens barrel in which a lens drive cam with a predetermined inclination angle is formed, and a movable lens inserted therein, supported movably in the optical axis direction along the inner circumferential surface of the rotary lens barrel, and rotated by the long groove. and a lens moving frame having a pin member to be regulated and a sliding portion that follows the lens driving cam as the rotating lens barrel rotates, the rotating lens barrel being connected to the fixed lens barrel. In the lens barrel, the lens moving frame is moved back and forth in the optical axis direction by relatively rotating the lens barrel, and the long groove and the lens driving cam each have an effective cam surface formed on one side, and Disposed substantially parallel to the axis, the sliding portion is pressed toward the effective cam surface of the lens driving cam, and the pin member is pressed against the effective cam surface of the long groove. A lens barrel characterized by comprising a compression spring that applies a torsional force in a direction.