JPH0567915U - Optical head device - Google Patents
Optical head deviceInfo
- Publication number
- JPH0567915U JPH0567915U JP796792U JP796792U JPH0567915U JP H0567915 U JPH0567915 U JP H0567915U JP 796792 U JP796792 U JP 796792U JP 796792 U JP796792 U JP 796792U JP H0567915 U JPH0567915 U JP H0567915U
- Authority
- JP
- Japan
- Prior art keywords
- mirror
- objective lens
- head device
- optical head
- galvano
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
(57)【要約】 （修正有）
【目的】 レーザ光に対する偏向感度が、対物レンズ６
を搭載した可動キャリッジ４とガルバノミラー２との距
離によって大きく変化しないガルバノミラー型光ヘッド
装置を提供する。
【構成】 ガルバノミラーの回転軸を、ガルバノミラー
２の表面から見て、可動キャリッジ４の後方背面側に配
置し、可動キャリッジ４の位置によって、偏向感度が大
きく変化しない構成とした光ヘッド装置。
(57) [Summary] (Correction) [Purpose] Deflection sensitivity to laser light is
Provided is a galvano-mirror type optical head device which does not largely change depending on a distance between a movable carriage 4 carrying the lens and the galvano-mirror 2. An optical head device in which a rotation axis of a galvanometer mirror is arranged on a rear rear side of a movable carriage 4 when viewed from a surface of the galvanometer mirror 2 and a deflection sensitivity does not largely change depending on a position of the movable carriage 4.
Description
【０００１】[0001]
本考案は、光ディスク装置の光学系におけるオートトラッキング用ガルバノミ ラー機構に関する。 The present invention relates to a galvano mirror mechanism for auto-tracking in an optical system of an optical disc device.
【０００２】[0002]
光ディスク装置の媒体の記録トラックの偏心に対してレーザ読み取り光を追従 させる目的で、光学系からの出射光を可動するミラーによって偏向させるガルバ ーミラーと呼ばれる機構が従来から提案されている。 Conventionally, a mechanism called a galber mirror has been proposed in which a laser reading light is made to follow an eccentricity of a recording track of a medium of an optical disk device, and a light emitted from an optical system is deflected by a movable mirror.
【０００３】 その構造は、図５で示すようにレーザ光源からの入射光線の入射点付近を中心 に微小に回転するようになっている。この動作によって記録媒体７上の光ビーム 位置は図の点線のように移動し、媒体７の偏心に合わせて変化する。As shown in FIG. 5, its structure is adapted to slightly rotate around an incident point of an incident light beam from a laser light source. By this operation, the position of the light beam on the recording medium 7 moves as shown by the dotted line in the figure, and changes according to the eccentricity of the medium 7.
【０００４】 対物レンズ６と立上げミラー５は本図には記載していないがアクセス時に記録 媒体７の記録範囲全体にわたって可動する事ができる可動キャリッジ４上に搭載 されている。Although not shown in the figure, the objective lens 6 and the raising mirror 5 are mounted on a movable carriage 4 which can be moved over the entire recording range of the recording medium 7 at the time of access.
【０００５】[0005]
以上の様に、ガルバノミラーの回転によってレーザ光を媒体の偏心に合わせて 偏向する方法では、レーザ光の偏向は、ガルバーミラー表面を中心にした回転で 行われるため、対物レンズを搭載した可動キャリッジ４とガルバノミラー２との 距離によって、媒体表面でのレーザ光の移動量、すなはち駆動電流に対する偏向 感度が大きく変化するという欠点があった。 As described above, in the method of deflecting the laser light in accordance with the eccentricity of the medium by rotating the galvanometer mirror, the deflection of the laser light is performed by rotating the surface around the surface of the galver mirror. Therefore, the movable carriage equipped with the objective lens is used. There is a drawback in that the amount of movement of the laser beam on the medium surface, that is, the deflection sensitivity to the drive current, greatly changes depending on the distance between the No. 4 and the galvano mirror 2.
【０００６】[0006]
本考案は、ガルバノミラーの回転軸を、ガルバノミラーの表面から見て、可動 キャリッジの立上げミラーの後方背面側に配置し、可動キャリッジの位置によっ て、ガルバノミラーの偏向感度が大きく変化しない構成とする。 According to the present invention, the rotation axis of the galvanometer mirror is arranged behind and behind the rising mirror of the movable carriage as viewed from the surface of the galvanometer mirror, and the deflection sensitivity of the galvanometer mirror does not change significantly depending on the position of the movable carriage. The configuration.
【０００７】[0007]
以下に本考案の一実施例について図面を参照して説明する。 An embodiment of the present invention will be described below with reference to the drawings.
【０００８】 図１、図２、図３、図４は本考案による光ヘッド装置の構成を示すものであり 、図１（ａ），（ｂ）は上面図と側面図であり、図２は基本的な光路の側面図、 図３（ａ），（ｂ）は本考案に係る部分のみの上面図と側面図、図４は動作中の 側面図である。1, 2, 3, and 4 show the structure of an optical head device according to the present invention. FIGS. 1A and 1B are a top view and a side view, and FIG. 3A and 3B are a side view of a basic optical path, FIGS. 3A and 3B are a top view and a side view of only a portion related to the present invention, and FIG. 4 is a side view in operation.
【０００９】 ガルバノミラーベース３は２本の腕８によって支えられ、回転軸（ヒンジ部） １０を中心に円弧状に回転可能となっている。The galvanometer mirror base 3 is supported by two arms 8 and is rotatable in an arc shape about a rotation shaft (hinge portion) 10.
【００１０】 このガルバノミラーベース３は駆動コイル１１が取り付けられ、この駆動コイ ル１１の中心に磁界が交差するよう永久磁石１２が光ヘッドベースに固定されて おり、駆動コイル１１に流す電流によって回転する。A drive coil 11 is attached to the galvano mirror base 3, and a permanent magnet 12 is fixed to the optical head base so that a magnetic field intersects the center of the drive coil 11, and the galvano mirror base 3 is rotated by a current flowing through the drive coil 11. To do.
【００１１】[0011]
以上説明したように本考案によれば、ガルバノミラーベースはほぼ平行に上下 する。 As described above, according to the present invention, the galvano mirror base moves up and down substantially in parallel.
【００１２】 従って、可動キャリッジの位置によって、偏向感度が大きく変化することはな い。Therefore, the deflection sensitivity does not change significantly depending on the position of the movable carriage.
【図１（ａ）】本考案を示す上面図。FIG. 1 (a) is a top view showing the present invention.
【図１（ｂ）】本考案を示す側面図。FIG. 1 (b) is a side view showing the present invention.
【図２】基本的な光路の側面図[Figure 2] Side view of the basic optical path
【図３（ａ）】本考案の主要部を示す上面図。FIG. 3 (a) is a top view showing the main part of the present invention.
【図３（ｂ）】本考案の主要部を示す側面図。FIG. 3 (b) is a side view showing the main part of the present invention.
【図４】本考案の動作状態を示す側面図。FIG. 4 is a side view showing an operating state of the present invention.
【図５】従来例の動作状態を示す側面図。FIG. 5 is a side view showing an operating state of a conventional example.
１ 固定光学系 ２ ガルバノミラー ３ ガルバノミラーベース ４ 可動キャリッジ ５ 立ち上げミラー ６ 対物レンズ ７ 記録媒体（光ディスク） ８ 腕 ９ 可動キャリッジ駆動部 １０ ガルバノミラーベース回転軸（ヒンジ） １１ ガルバノミラーベース駆動コイル １２ 永久磁石 1 Fixed Optical System 2 Galvano Mirror 3 Galvano Mirror Base 4 Movable Carriage 5 Stand Up Mirror 6 Objective Lens 7 Recording Medium (Optical Disk) 8 Arm 9 Movable Carriage Drive Unit 10 Galvano Mirror Base Rotation Axis (Hinge) 11 Galvano Mirror Base Drive Coil 12 permanent magnet
Claims (1)
向に微小移動可能に備えたアクチュエータ可動部と、こ
の対物レンズに光線を断続自在に照射させる固定光学素
子手段と、前記対物レンズとの間に位置し、前記光線を
対物レンズ方向または固定光学素子手段方向に反射する
ガルバノミラー手段を備えた光ヘッド装置において、 前記ガルバノミラー手段は、回転軸が可動キャリッジ部
の後方に配置することを特徴とする光ヘッド装置。1. An objective lens, an actuator moving part provided with the objective lens so as to be capable of minute movement in the optical axis direction, a fixed optical element means for irradiating the objective lens with light rays intermittently, and the objective lens. In an optical head device provided with a galvano-mirror means for reflecting the light beam in the direction of an objective lens or a fixed optical element means, the galvano-mirror means has a rotation axis arranged behind a movable carriage part. Characteristic optical head device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP796792U JPH0567915U (en) | 1992-02-24 | 1992-02-24 | Optical head device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP796792U JPH0567915U (en) | 1992-02-24 | 1992-02-24 | Optical head device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0567915U true JPH0567915U (en) | 1993-09-10 |
Family
ID=11680239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP796792U Pending JPH0567915U (en) | 1992-02-24 | 1992-02-24 | Optical head device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0567915U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56165937A (en) * | 1980-05-23 | 1981-12-19 | Matsushita Electric Ind Co Ltd | Optical recorder and reproducer |
-
1992
- 1992-02-24 JP JP796792U patent/JPH0567915U/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56165937A (en) * | 1980-05-23 | 1981-12-19 | Matsushita Electric Ind Co Ltd | Optical recorder and reproducer |
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