JPH041508U

JPH041508U -

Info

Publication number: JPH041508U
Application number: JP4021890U
Authority: JP
Priority date: 1990-04-17
Filing date: 1990-04-17
Publication date: 1992-01-08
Anticipated expiration: 2005-04-17
Also published as: JP2521866Y2

Description

[Brief explanation of the drawing]

第１図は、この考案の実施例に係るレンズ移動
装置の側断面図、第２図は、第１図の装置を像面
側より見た一部破断側面図、第３図は、カム面と
送りねじとの関係を示す断面図、第４図は、１群
レンズ群と２群レンズ群の移動軌跡線図である。１……鏡胴カバー、２……固定鏡胴、２ａ……
鏡胴取付枠、２ｂ……鏡胴リング、２ｃ……フラ
ンジ部、４……鏡胴蓋、５……第１の送りねじ、
６……歯車、８……ガイド溝、９……２群移動枠
、１０……レンズ枠、１１……２群レンズ群、１
２……第２の送りねじ、１３……止めリング、１
４……コイルばね、１５……突起、１６……１群
移動枠、１７……レンズ枠、１８……１群レンズ
群、１９……ガイド棒、２０……カム部材、２１
……内歯歯車、２２……カム面、２４……モータ
、２５〜２７……減速歯車。 FIG. 1 is a side sectional view of a lens moving device according to an embodiment of this invention, FIG. 2 is a partially cutaway side view of the device shown in FIG. 1 as seen from the image plane side, and FIG. 3 is a cam surface FIG. 4 is a cross-sectional view showing the relationship between the feed screw and the feed screw, and is a movement locus diagram of the first lens group and the second lens group. 1... Lens barrel cover, 2... Fixed lens barrel, 2a...
Lens barrel mounting frame, 2b... Lens barrel ring, 2c... Flange portion, 4... Lens barrel cover, 5... First feed screw,
6... Gear, 8... Guide groove, 9... 2nd group moving frame, 10... Lens frame, 11... 2nd group lens group, 1
2...Second feed screw, 13...Retaining ring, 1
4... Coil spring, 15... Protrusion, 16... 1st group moving frame, 17... Lens frame, 18... 1st group lens group, 19... Guide rod, 20... Cam member, 21
... Internal gear, 22 ... Cam surface, 24 ... Motor, 25 to 27 ... Reduction gear.

Claims

[Claims for Utility Model Registration] A lens moving device that changes magnification or focuses by moving a plurality of lens groups relative to each other in the optical axis direction, which is rotatable toward the inner wall of a fixed lens barrel, and which a hollow first feed screw having a gear, which is arranged so as not to be movable in the direction; and a first moving frame screwed to the first feed screw; an arbitrary first lens group among the lens groups, and an engaging means that is inserted into the first feed screw and movable in the optical axis direction and rotates integrally with the first feed screw; A second feed screw that has a contact portion on one end side and is biased by a spring on the side where the contact portion is provided, and a lens frame that is attached to a second moving frame screwed to the second feed screw. an arbitrary second lens group among the plurality of lens groups attached through the lens group; a guide rod that guides movement of the first moving frame and the second moving frame in the optical axis direction; rotatably provided on the inner peripheral surface of the fixed lens barrel,
a cam member having a gear formed in at least a portion thereof and having a cam surface formed on an end face that is in pressure contact with the contact portion of the second feed screw; and the first feed screw via a group of reduction gears. and a motor that rotationally drives the gear of the cam member and the gear of the cam member, and the first gear is rotated by the rotation of the motor.
and a second feed screw is rotated to relatively linearly displace the first and second lens groups in the optical axis direction by screw action, and at the same time, the second feed screw is provided on the cam member. 1. A lens moving device, characterized in that the second lens group is moved in the optical axis direction by a cam action on a cam surface, so that the second lens group is moved by an inflection displacement in combination with the linear displacement movement.