JPS6396615U

JPS6396615U -

Info

Publication number: JPS6396615U
Application number: JP18999886U
Authority: JP
Priority date: 1986-12-10
Filing date: 1986-12-10
Publication date: 1988-06-22

Description

[Brief explanation of drawings]

第１図はこの考案に係る一実施例の平面図、第
２図は同じくその側断面図、第３図は同じくその
背面図、第４図は従来例の平面図、第５図は同じ
くその側断面図である。符号説明、１：対物レンズ保持体、１ａ：端部
、１ｂ：円筒部、２：軸受、４：支持軸、６：対
物レンズ、７：フオーカスコイル、８Ａ〜８Ｄ：
トラツキングコイル、９：永久磁石、１０：ヨー
ク、１０ｃ：基ヨーク、１０ｅ：中空部、１０ｆ
：取付座、１１：支持ピン、１３：弾性連結体、
１８：取付ピン。 Fig. 1 is a plan view of an embodiment according to this invention, Fig. 2 is a side sectional view thereof, Fig. 3 is a rear view thereof, Fig. 4 is a plan view of a conventional example, and Fig. 5 is a plan view thereof. FIG. Explanation of symbols, 1: Objective lens holder, 1a: End, 1b: Cylindrical portion, 2: Bearing, 4: Support shaft, 6: Objective lens, 7: Focus coil, 8A to 8D:
Tracking coil, 9: Permanent magnet, 10: Yoke, 10c: Base yoke, 10e: Hollow part, 10f
: Mounting seat, 11: Support pin, 13: Elastic connector,
18: Mounting pin.

Claims

[Claims for Utility Model Registration] The objective lens holding part includes a yoke part and a focus coil and a tracking coil on the outer peripheral surface of a cylindrical part having an end on only one side. An objective lens is provided at the end portion with its optical axis parallel to the center line of the cylindrical portion, and the other yoke portion has a support shaft erected at the center of a base yoke serving as a base member. and a pair of an inner yoke and an outer yoke facing each other are erected at symmetrical positions on both sides of the support shaft,
The objective lens holder is supported by a spindle of the yoke to be able to move slightly in the direction of the center line, and to be able to swing slightly around the center line, and to support the objective lens holder. The holding part and the yoke part are connected to each other by an elastic connecting body as a centering mechanism located in the inner space of the cylindrical part of the objective lens holding part. and a stepped recess formed by engraving from the side opposite to the support shaft adjacent to the hollow part, and one end of the elastic coupling body is attached to the surface of the stepped recess so that the objective lens An objective lens driving device characterized in that the other end of the elastic coupling body can be fixed to the inner surface of the end of the holding part through the hollow part.