JPS5936030U

JPS5936030U - Objective lens drive device

Info

Publication number: JPS5936030U
Application number: JP5969782U
Authority: JP
Inventors: 伊熊　昭等
Original assignee: 株式会社日立製作所
Priority date: 1982-04-26
Filing date: 1982-04-26
Publication date: 1984-03-06

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は本考案による実施例の二次元対物レンズ駆動装
置を展開して示した構造図、第２図は部分的に断面にし
た斜透視図、第３図は磁気回路をかす構造図、第４図は
振動周波数特性である。２・・・・・・基台、１０・・・・・・対物レンズ、１
２・・・・・・フォーカシングコイル、１３・・・・・
・トラッキングコイル、１５・・・・・・重り、１７・
・・・・・磁気回路。補正　昭５８．　７．２６実用新案登録請求の範囲を次のように補正する。Ｏ実用新案登録請求の範囲１　対物レンズを含む被駆動体と、該被駆動体を対物レ
ンズの光軸のフォーカシング方向および光軸と垂直のト
ラッキング方向に移動可能に弾性的に支持した弾性支持
部材と、前記被駆動体に固定されたフォーカシングコイ
ル及びトラッキングコイルと、前記２つのコイルを同じ
磁気空隙内に界在させる磁気回路部材と、前記被駆動体
に固定され、前記対物レンズの光軸方向において前記被
駆動体の前記トラッキング方向の、　駆動力の中心を、
被駆動体の重心に一致させるかそれより前記対物レンズ
側に位置させる調整体とを具備してなる対物レンズ駆動
装置。２　実用新案登録請求の範囲第１項記載の対物レンズ駆
動装置において、前記調整体が中央に光束を通過させる
ための穴を有し、被駆動体の前記対物レンズと反対側の
端部に固定した重りからなる対物レンズ駆動装置。図面の簡単な説明を次のように補正する。明細書第７頁第９〜１０行の「特性である。」を「特性
図、第５図は被駆動体のトラッキング方向の駆動の説明
図である。」と補正する。FIG. 1 is an exploded structural diagram of a two-dimensional objective lens driving device according to an embodiment of the present invention, FIG. 2 is a perspective view partially cut away, and FIG. 3 is a structural diagram showing a magnetic circuit. Figure 4 shows the vibration frequency characteristics. 2...Base, 10...Objective lens, 1
2...Focusing coil, 13...
・Tracking coil, 15... Weight, 17.
...magnetic circuit. Amended 1984. 7.26 The scope of claims for utility model registration is amended as follows. O Utility Model Registration Claim 1 A driven body including an objective lens, and an elastic support member that elastically supports the driven body so as to be movable in the focusing direction of the optical axis of the objective lens and in the tracking direction perpendicular to the optical axis. a focusing coil and a tracking coil fixed to the driven body; a magnetic circuit member that makes the two coils exist in the same magnetic gap; and a magnetic circuit member fixed to the driven body and arranged in the optical axis direction of the objective lens. The center of the driving force of the driven body in the tracking direction is
An objective lens drive device comprising: an adjustment body that is aligned with the center of gravity of a driven body or positioned closer to the objective lens than the center of gravity of the driven body. 2 Utility Model Registration Scope of Claims 1. The objective lens driving device according to claim 1, wherein the adjustment body has a hole in the center for passing a light beam, and is fixed to an end of a driven body opposite to the objective lens. Objective lens drive device consisting of a weight. The brief description of the drawing has been amended as follows. "Characteristics." in lines 9 and 10 of page 7 of the specification is corrected to "Characteristics diagram. FIG. 5 is an explanatory diagram of driving the driven body in the tracking direction."

Claims

[Scope of claims for utility model registration] 1. Reading information optically recorded on a recording medium,
An objective lens drive device for regulating the focal position of an objective lens, characterized in that the objective lens drive device is provided with an adjustment body that makes the driving force of a driven body including the objective lens substantially coincide with the center of gravity in the direction of action. . 2. The adjusting body has a hole in the center for passing the light beam, and is composed of a weight fixed to a part of the driven body, and the weight aligns the optical axis and the center of gravity during vertical vibration with the center of the driving force. The objective lens driving device according to claim 1, which corresponds to the scope of the utility model registration claim.