JPS61170120U

JPS61170120U -

Info

Publication number: JPS61170120U
Application number: JP5262585U
Authority: JP
Priority date: 1985-04-09
Filing date: 1985-04-09
Publication date: 1986-10-22

Description

[Brief explanation of drawings]

第１図及び第５図ならびに第６図は本考案の光
学的情報信号再生装置の光学系の駆動装置の各異
なる実施例のブロツク図、第２図は集光レンズ組
立体ＦＶと回動組立体ＲＶとの分解斜視図、第３
図は第１図中のＥ―Ｅ線位置における平断面図、
第４図は反射鏡の回動による光線の偏向を説明す
る図、第７図は従来の光学的情報信号再生装置の
光学系の駆動装置のブロツク図である。１……光学的情報記録媒体、２……光源、３…
…コリメートレンズ、４……ビームスプリツタ、
５，６……回動鏡、７，１７……集光レンズ、８
……光のスポツト、９……受光素子、１０……集
光レンズ駆動装置、１１……フオーカス制御信号
発生回路、１２……時間軸誤差補正信号発生回路
、１３……トラツキング制御信号発生回路、１８
……集光レンズの保持体、１９，２６ａ〜２６ｄ
……コイル、２０……コア、２１，２２……ヨー
ク、２３，２４，３３……永久磁石、２５……ス
リーブ、２７……プレート、２８……反射鏡ホル
ダー、２９……反射鏡、３０……中心保持子、３
１……スペーサ、３４……環状の連結部材、ＦＶ
……集光レンズ組立体、ＲＶ……回動組立体、ｍ
ｓ１，ｍｓ２……第１、第２の磁気穴隙。 1, 5, and 6 are block diagrams of different embodiments of the driving device for the optical system of the optical information signal reproducing device of the present invention, and FIG. 2 shows the condenser lens assembly FV and the rotating assembly. Exploded perspective view with three-dimensional RV, 3rd
The figure is a plan sectional view taken along the line E-E in Figure 1.
FIG. 4 is a diagram for explaining the deflection of a light beam due to the rotation of a reflecting mirror, and FIG. 7 is a block diagram of a driving device for an optical system of a conventional optical information signal reproducing device. 1... Optical information recording medium, 2... Light source, 3...
...Collimating lens, 4...Beam splitter,
5, 6... Rotating mirror, 7, 17... Condensing lens, 8
... Light spot, 9 ... Light receiving element, 10 ... Condensing lens drive device, 11 ... Focus control signal generation circuit, 12 ... Time axis error correction signal generation circuit, 13 ... Tracking control signal generation circuit, 18
...Condensing lens holder, 19, 26a to 26d
... Coil, 20 ... Core, 21, 22 ... Yoke, 23, 24, 33 ... Permanent magnet, 25 ... Sleeve, 27 ... Plate, 28 ... Reflector holder, 29 ... Reflector, 30 ...Center retainer, 3
1... Spacer, 34... Annular connecting member, FV
... Condensing lens assembly, RV ... Rotating assembly, m
s1, ms2...first and second magnetic hole gaps.

補正昭６０．７．８実用新案登録請求の範囲を次のように補正する
。Amendment July 8, 1980 The scope of claims for utility model registration is amended as follows.

【実用新案登録請求の範囲】光学的情報記録媒体に微小な径の光のスポツト
を投射するための集光レンズと、前記した光のス
ポツトを記録媒体面上で所定の方向に移動させる
ために光を偏向させる回動鏡とを含んで構成され
ている光学的情報信号再生装置の光学系の駆動装
置であつて、集光レンズが固着されている集光レ
ンズ保持体と前記した集光レンズ保持体に固着さ
れた１個のコイルとからなる集光レンズ組立体と
、前記した集光レンズ組立体における前記の１個
のコイルが集光レンズの光軸を中心とする円環状
の第１の磁気空隙内で光軸方向で変位自在となさ
れるように集光レンズ組立体を光軸方向に変位自
在に保持する保持手段と、光軸を中心とする円周
を複数個に分割するような配置態様で複数個のコ
イルが配設されているとともに反射鏡を備えてな
る回動組立体と、前記の回動組立体における複数
個のコイルがそれぞれ第２の磁気空隙内で変位自
在となされる状態で回動組立体が変位できるよう
に、光軸を回動中心にして回動組立体を支持する
支持手段と、前記した第１の磁気空隙と第２の磁
気空隙とが光軸方向における反対の端部付近に構
成されている如き磁気回路とを備えてなる光学的
情報信号再生装置の光学系の駆動装置。[Claims for Utility Model Registration] A condensing lens for projecting a spot of light with a minute diameter onto an optical information recording medium, and a condenser lens for moving the spot of light in a predetermined direction on the surface of the recording medium. A drive device for an optical system of an optical information signal reproducing device that includes a rotary mirror that deflects light, the device comprising: a condenser lens holder to which a condenser lens is fixed; and the aforementioned condenser lens. a condenser lens assembly consisting of one coil fixed to a holder, and a first coil in the annular shape centered on the optical axis of the condenser lens; a holding means for holding the condenser lens assembly so as to be freely displaceable in the optical axis direction within the magnetic gap of the optical axis; a rotating assembly comprising a plurality of coils disposed in a manner of arrangement and a reflecting mirror; each of the plurality of coils in the rotating assembly being freely displaceable within a second magnetic gap; supporting means for supporting the rotating assembly with the optical axis as a center of rotation so that the rotating assembly can be displaced in a state in which the rotating assembly is rotated; A driving device for an optical system of an optical information signal reproducing device, comprising a magnetic circuit configured near opposite ends in a direction.

Claims

[Scope of utility model registration request]

A condensing lens for projecting a spot of light with a minute diameter onto an optical information recording medium, and a rotating mirror for deflecting the light to move the spot of light in a predetermined direction on the surface of the recording medium. A driving device for an optical system of an optical information signal reproducing device comprising: a condensing lens holder to which a condensing lens is fixed; and one unit fixed to the condensing lens holder. a condensing lens assembly consisting of a coil; and the one coil in the condensing lens assembly described above is arranged in the optical axis direction within a first annular magnetic gap centered on the optical axis of the condensing lens. a holding means for holding the condenser lens assembly movably in the direction of the optical axis, and a plurality of coils arranged in such a manner that the circumference centered on the optical axis is divided into a plurality of parts. and a plurality of coils in the rotary assembly are respectively displaceable within a second magnetic gap. A support means for supporting the rotating assembly with the optical axis as a rotation center so as to be able to be displaced, and the first magnetic gap and the second magnetic gap are configured near opposite ends in the optical axis direction. A driving device for an optical system of an optical information signal reproducing device, comprising a magnetic circuit as shown in FIG.