JPS6352339A - Optical head - Google Patents

Optical head

Info

Publication number
JPS6352339A
JPS6352339A JP61194091A JP19409186A JPS6352339A JP S6352339 A JPS6352339 A JP S6352339A JP 61194091 A JP61194091 A JP 61194091A JP 19409186 A JP19409186 A JP 19409186A JP S6352339 A JPS6352339 A JP S6352339A
Authority
JP
Japan
Prior art keywords
objective lens
disk
lens actuator
radial direction
cover
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
Application number
JP61194091A
Other languages
Japanese (ja)
Inventor
Shoji Goto
後藤 庄司
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP61194091A priority Critical patent/JPS6352339A/en
Publication of JPS6352339A publication Critical patent/JPS6352339A/en
Pending legal-status Critical Current

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  • Optical Head (AREA)

Abstract

PURPOSE:To prevent dust in air from being accumulated in an objective lens actuator by closing holes, through which approximately parallel rays radiated from an optical base in a fixed position are made incident on and are emitted from the objective lens actuator, with cover glasses. CONSTITUTION:Cover glasses 80 and 82 are provided which close an incidence hole 72, which is provided on a cover so that approximately parallel rays are made incident on an objective lens actuator 70 through this incidence hole 72, and an exit hole 78 which is provided on the cover member throughout the movement range in the disk radial direction of an objective lens 26 so that approximately parallel rays condensed by the objective lens 26 are emitted toward the surface of a disk 24. Since the in-side of the objective lens actuator 70 is completely isolated from the outside air, dust does not penetrate the inside. Consequently, dust is not accumulated on the objective lens 26 and a light reflecting means, and the optical capacity is not degraded to hold a good characteristic.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、光デイスク上に情報を記録し、あるいは再生
するための光学ヘッドに関するものである。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an optical head for recording or reproducing information on an optical disk.

(従来の技術) 光デイスク装置は、コンパクトディスク、ビデオディス
クあるいはコンピュータのデータメモリとして急速に普
及してきている。この光ディスクは大容量、長寿命、高
速アクセスが可能である等の優れた特徴を持っているが
、また同時に光を使うが故に欠点も持っている。それは
、空気中のほこりに対して弱いということである。たと
えば、光学ヘッドを構成する光学部品の上にほこりが積
もるとディスクへの情報の記録、再生に非常に大きな障
害を与える。
(Prior Art) Optical disk devices are rapidly becoming popular as compact disks, video disks, and data memories for computers. Although this optical disk has excellent features such as large capacity, long life, and high-speed access, it also has drawbacks because it uses light. This means that it is vulnerable to dust in the air. For example, if dust accumulates on the optical components that make up the optical head, it will seriously impede the recording and reproduction of information on the disk.

以下、従来の光学ヘッドについて図面を参照して説明す
る。第6図は従来の光学ヘッドの要部を示す断面図であ
って、固定光学台2からは略平行なレーザ光4がディス
ク6の半径方向に放射されている。ディスク6の半径方
向に移動可能な対物レンズアクチュエータ8には、レー
ザ光4が入射する入射口10が設けられている。入射口
10を通過したレーザ光4は、対物レンズアクチュエー
タ8上のミラー12で反射されて対物レンズ14に至る
A conventional optical head will be described below with reference to the drawings. FIG. 6 is a cross-sectional view showing the main parts of a conventional optical head, in which a substantially parallel laser beam 4 is emitted from a fixed optical bench 2 in the radial direction of a disk 6. An objective lens actuator 8 movable in the radial direction of the disk 6 is provided with an entrance port 10 through which the laser beam 4 enters. The laser beam 4 that has passed through the entrance port 10 is reflected by the mirror 12 on the objective lens actuator 8 and reaches the objective lens 14 .

対物レンズ14はミラー12で反射されたレーザ光4を
ディスク6上に集束して、情報の記録あるいは再生を行
なう。コイル手段16は対物レンズ14と一体的に固定
されており、対物レンズ14をディスク6の面方向およ
び半径方向と駆動する。この光学ヘッドは、特に高速ア
クセスを目的としたものであり、アクセス時には対物レ
ンズアクチュエータ8だけがディスク6の半径方向に移
動する、いわゆる分離型の光学ヘッドである。
The objective lens 14 focuses the laser beam 4 reflected by the mirror 12 onto the disk 6 to record or reproduce information. The coil means 16 is fixed integrally with the objective lens 14, and drives the objective lens 14 in the in-plane direction and radial direction of the disk 6. This optical head is particularly intended for high-speed access, and is a so-called separate optical head in which only the objective lens actuator 8 moves in the radial direction of the disk 6 during access.

(発明が解決しようとする問題点) このように構成した光学ヘッドでは、対物レンズ14は
もちろんのこと、レーザ光4を反射するミラー12も空
気中に露出することになるので、これらの光学部品の上
にほこりが積もる。光学部品上にほこりが核もるとレー
ザ光4の透過率が低下し、また、レーザビームの形状が
変形することがあり、ディスク6への記録、再生に大き
な障害となる。
(Problems to be Solved by the Invention) In the optical head configured as described above, not only the objective lens 14 but also the mirror 12 that reflects the laser beam 4 are exposed in the air, so these optical parts are exposed to the air. Dust accumulates on top of it. If dust accumulates on the optical components, the transmittance of the laser beam 4 will decrease, and the shape of the laser beam may be deformed, which will seriously impede recording and reproduction on the disk 6.

従って、従来の光学ヘッドでは、光学部品上に積もった
ほこりは一般のユーザーが清掃によって取り除いている
わけであるが、この清掃時に対物レンズ14を傷付けた
り、あるいは対物レンズの支持機構であるばねを損傷す
ることがあった。また、ミラー12は奥の方にあるため
に実際的には清掃が不可能であり、はこりの問題に対す
る対策が強く望まれている。
Therefore, in conventional optical heads, dust accumulated on the optical components is removed by general users by cleaning, but during this cleaning, the objective lens 14 may be damaged or the spring that is the support mechanism of the objective lens may be damaged. Damage could occur. Further, since the mirror 12 is located at the back, it is practically impossible to clean it, and there is a strong desire for a countermeasure against the problem of flaking.

(問題点を解決するための手段) 上記問題を解決するために本発明の光学ヘットは、固定
位置にあって、ディスクの半径方向に略平行光を放射す
る光学台と、上記略平行光を上記ディスクの面方向に反
射する光反射手段と、上記光反射手段で反射された上記
略平行光を上記ディスク上に集光する対物レンズと、上
記対物レンズと一体的に構成され、上記対物レンズを上
記ディスクの面方向および半径方向に電磁力によって駆
動するコイル手段と、上記コイル手段に駆動力を発生さ
せる磁気回路と、上記光反射手段と対物レンズとコイル
手段とから成り、上記略平行光の進行方向に移動可能な
移動体と、上記移動体と磁気回路とから成る対物レンズ
アクチュエータと、上記対物レンズアクチュエータを覆
うカバー部材と、上記対物レンズアクチュエータに上記
略平行光が入射するよう上記カバーに設けた入射口と、
上記対物レンズによって集束された上記略平行光が上記
ディスク面の方向へ出射するよう上記対物レンズの上記
ディスク半径方向の移動幅にわたって上記カバー部材に
設けた出射口と、上記入射口と出射口をふさぐカバーガ
ラスを有するものである。
(Means for solving the problem) In order to solve the above problem, the optical head of the present invention includes an optical bench that is located at a fixed position and emits substantially parallel light in the radial direction of the disk, and an optical bench that emits substantially parallel light in the radial direction of the disk. A light reflecting means for reflecting in the surface direction of the disk, an objective lens for condensing the substantially parallel light reflected by the light reflecting means onto the disk, and integrally formed with the objective lens, the objective lens a coil means for driving the disk by electromagnetic force in the in-plane direction and radial direction of the disk, a magnetic circuit for generating a driving force in the coil means, the light reflection means, the objective lens, and the coil means, and the substantially parallel light beam is a movable body movable in the direction of travel; an objective lens actuator comprising the movable body and a magnetic circuit; a cover member for covering the objective lens actuator; and a cover for allowing the substantially parallel light to enter the objective lens actuator. an entrance hole provided in the
An exit aperture provided in the cover member over a movement width of the objective lens in the radial direction of the disk so that the substantially parallel light focused by the objective lens is emitted in the direction of the disk surface; It has a covering glass.

(作 用) 本発明は上記したように、固定位置にある光学台から放
射された略平行光の対物レンズアクチュエータへの入射
口および出射口をカバーガラスでふさぐことによって、
対物レンズアクチニエータ内部に空気中のほこりが積も
ることを防ぐことができるものであり、特に対物レンズ
アクチュエータの光学特性の維持に優れた効果を有する
ものである。
(Function) As described above, the present invention can achieve the following effects by blocking the entrance and exit ports of substantially parallel light emitted from the optical bench at a fixed position into the objective lens actuator with a cover glass.
This can prevent dust in the air from accumulating inside the objective lens actiniator, and is particularly effective in maintaining the optical characteristics of the objective lens actuator.

(実施例) 以下、本発明の一実施例の光学ヘッドについて図面を参
照しながら説明する。第1図ないし第5図は本発明の一
実施例における光学ヘットを示し、第1図は平面図、第
2図は第1図の要部を透視した平面図、第3図は正面図
、第4図は側面図、第5図はX−X線断面図である。第
1図ないし第5図において、固定光学台20から放射さ
九る略平行なレーザ光22はディスク24の半径方向に
その進行方向を持っている。対物レンズ26をディスク
24の半径方向に駆動させるコイル手段28は、対物レ
ンズ26と一体的に固定されて可動部(A)30となる
(Example) An optical head according to an example of the present invention will be described below with reference to the drawings. 1 to 5 show an optical head according to an embodiment of the present invention, FIG. 1 is a plan view, FIG. 2 is a plan view of the main part of FIG. 1, and FIG. 3 is a front view. FIG. 4 is a side view, and FIG. 5 is a sectional view taken along the line X--X. 1 to 5, the substantially parallel laser beam 22 emitted from the fixed optical bench 20 has its traveling direction in the radial direction of the disk 24. In FIGS. A coil means 28 for driving the objective lens 26 in the radial direction of the disk 24 is fixed integrally with the objective lens 26 and becomes a movable part (A) 30.

この可動部(A)30は、板ばね32の一端が可動部(
A)30に、他端がフレーム34に固定さ九ることによ
ってフレーム34に対してディスク24の面方向に移動
可能に支持されている。上下のフレーム34を連結する
一方の支柱36には窓体38が設けらhており、他方の
支柱40には窓体38を通過したレーザ光22を対物レ
ンズ26の方向へ反射するミラー42が固定されている
。そして、ミラー42で反射したレーザ光22は対物レ
ンズ26によってディスク24上に集束される。支柱3
6.40. ミラー42.フレーム34が一体となった
可動部(B)44は板ばね32によって連結された可動
部(A)と一体となって移動体46となる。移動体46
を構成するフレーム34にはベアリング48が回転自在
に支承されており、ベアリング48はレール50上を回
転することができる。移動体46はコイル手段28に発
生するディスク24の半径方向の駆動力を受けて、ベア
リング48がレール50上を回転することによってディ
スク24の半径方向へ移動可能である。マグネット52
を含み、コイル手段28に駆動力を発生させる磁気回路
54の一端には連結部材56がビス58を支点として第
3図中の矢印で示す方向に回動可能に取り付けられてい
る。磁気回路54の固定光学台20と対向する側面には
、移動体46と磁気回路54で構成される対物レンズア
クチュエータ70へのレーザ光22の入射ロア2が設け
られており、この入射ロア2は無反射コーティングを施
したカバーガラス80が貼り付けられている。連結部材
56の上には固定光学台20が第1図中の矢印で示す方
向に軸60を支点として回動可能に取り付けられている
。対物レンズアクチュエータ70は上方からカバー部材
74で覆われ、また下方からもカバー部材76で覆われ
ている。上方のカバー部材74には対物レンズ26で集
光されたレーザ光22がディスク24の面方向へ出射す
るための出射ロア8が対物レンズ26のディスク半径方
向の移動幅にわたって設けられており、この出射ロア8
にも無反射コートを施したカバーガラス82が貼り付け
られている。このように、対物レンズアクチュエータ7
0を上下からカバー部材74.76で覆い、さらに、入
射ロア2および出射ロア8をカバーガラス80および8
2でふさいでいるために、対物レンズアクチュエータ7
0の内部は外気から完全に遮断されることになる。従っ
て、対物レンズ26.ミラー42およびレール50上に
ほこりが積もることはなく、光学的な性能の劣化やベア
リング48の負荷が増大することがない。
This movable part (A) 30 is such that one end of the plate spring 32 is a movable part (
A) The other end of the disk 30 is fixed to the frame 34, so that it is supported movably in the surface direction of the disk 24 with respect to the frame 34. One column 36 that connects the upper and lower frames 34 is provided with a window 38, and the other column 40 is provided with a mirror 42 that reflects the laser beam 22 that has passed through the window 38 toward the objective lens 26. Fixed. The laser beam 22 reflected by the mirror 42 is focused onto the disk 24 by the objective lens 26. Pillar 3
6.40. Mirror 42. The movable part (B) 44 with which the frame 34 is integrated becomes a movable body 46 with the movable part (A) connected by the leaf spring 32. Mobile body 46
A bearing 48 is rotatably supported on the frame 34 that constitutes the frame 34, and the bearing 48 can rotate on the rail 50. The movable body 46 is movable in the radial direction of the disk 24 as the bearing 48 rotates on the rail 50 in response to a driving force in the radial direction of the disk 24 generated by the coil means 28 . magnet 52
A connecting member 56 is attached to one end of a magnetic circuit 54 that generates a driving force in the coil means 28, so that it can rotate in the direction indicated by the arrow in FIG. 3 with a screw 58 as a fulcrum. On the side surface of the magnetic circuit 54 facing the fixed optical bench 20, there is provided an input lower 2 for the laser beam 22 to enter the objective lens actuator 70 composed of the movable body 46 and the magnetic circuit 54. A cover glass 80 coated with an anti-reflection coating is attached. A fixed optical bench 20 is mounted on the connecting member 56 so as to be rotatable about a shaft 60 in the direction indicated by the arrow in FIG. The objective lens actuator 70 is covered from above with a cover member 74 and also from below with a cover member 76. The upper cover member 74 is provided with an emission lower 8 for emitting the laser beam 22 focused by the objective lens 26 in the surface direction of the disk 24 over the movement width of the objective lens 26 in the disk radial direction. Output lower 8
A cover glass 82 coated with an anti-reflection coating is also attached to the cover glass 82 . In this way, the objective lens actuator 7
0 from above and below with cover members 74 and 76, and furthermore, the entrance lower 2 and the exit lower 8 are covered with cover glasses 80 and 8.
2, the objective lens actuator 7
The interior of 0 will be completely cut off from the outside air. Therefore, the objective lens 26. Dust does not accumulate on the mirror 42 and rail 50, and optical performance does not deteriorate or the load on the bearing 48 increases.

(発明の効果) 以上のように本発明の光学ヘッドは、固定位置にあって
、ディスクの半径方向に略平行光を放射する光学台と、
上記略平行光を上記ディスクの面方向に反射する光反射
手段と、上記光反射手段で反射された上記略平行光を上
記ディスク上に集光する対物レンズと、上記対物レンズ
と一体的に構成され、上記対物レンズを上記ディスクの
面方向および半径方向に電磁力によって駆動するコイル
手段と、上記コイル手段に駆動力を発生させる磁気回路
と、上記光反射手段と対物レンズとコイル手段とから成
る光学ヘッドにおいて、上記光平行の進行方向に移動可
能な移動体と磁気回路とから成る対物レンズアクチュエ
ータを覆うカバー部材と、上記対物レンズアクチュエー
タに上記略平行光が入射するよう上記カバーに設けた入
射口と、上記対物レンズによって集光された上記略平行
光が上記ディスク面の方向へ出射するよう上記対物レン
ズの上記ディスク半径方向の移動幅にわたって上記カバ
ー部材に設けた出射口とをふさぐカバーガラスを設ける
ことによって、対物レンズアクチュエータの内部は完全
に外気から遮断されるために、この内部にほこりが入る
ことがない。従って、対物レンズ、光反射手段上にほこ
りが積もることがなく、光学性能が劣化することがなく
、良好な特性を維持し続けることができる。また、カバ
ーガラス上に積もったほこりは、非常に安易に清掃する
ことができ、清掃時にも特別の注意を払う必要がない。
(Effects of the Invention) As described above, the optical head of the present invention includes an optical bench that is located at a fixed position and emits substantially parallel light in the radial direction of the disk;
A light reflecting means for reflecting the substantially parallel light in the surface direction of the disk, an objective lens for condensing the substantially parallel light reflected by the light reflecting means onto the disk, and integrated with the objective lens. and comprises a coil means for driving the objective lens in the in-plane direction and radial direction of the disk by electromagnetic force, a magnetic circuit for generating a driving force in the coil means, the light reflecting means, the objective lens, and the coil means. In the optical head, the cover member includes a cover member that covers an objective lens actuator including a movable body movable in a direction parallel to the light beam and a magnetic circuit, and an entrance provided on the cover so that the substantially parallel light is incident on the objective lens actuator. a cover glass for blocking an exit port provided in the cover member over a movement width of the objective lens in the radial direction of the disk so that the substantially parallel light focused by the objective lens is emitted in the direction of the disk surface; By providing the objective lens actuator, the interior of the objective lens actuator is completely isolated from the outside air, so that no dust can enter the interior. Therefore, dust does not accumulate on the objective lens and the light reflecting means, and the optical performance does not deteriorate, making it possible to continue to maintain good characteristics. Further, dust accumulated on the cover glass can be cleaned very easily, and there is no need to pay special attention during cleaning.

【図面の簡単な説明】[Brief explanation of drawings]

第1図ないし第5図は本発明の一実施例における光学ヘ
ッドを示し、第1図は平面図、第2図は第1図の要部透
視図、第3図は正面図、第4図は側面図、第5図はX−
X線断面図、第6図は従来の光学ヘットの要部側断面図
である。 20  固定光学台、 22・ レーザ光、 24・・
ディスク、 26・・対物レンズ、 28  コイル手
段、 30・・可動部(A)、 36・・・支柱、38
・・・窓体、 40・支柱、 42・・・ミラー、44
・・可動部(B)、 46・・・移動体、 52・マグ
ネット、 54・・・磁気回路、 56・連結部材、 
58・・ビス、 60・・・軸、 70・・対物レンズ
アクチュエータ、 72・・入射口、 74゜76・・
カバー部材、 78・・・出射口、 80.82・・・
カバーガラス。 特許出願人 松下電器産業株式会社 第3図 20固疋先字酎 56.、、!、茹邪JオX、76、、
カバー部材 8271ツマ−ゲラ人 第4図 54 FtL九同分  72.入射ロ ア乙、76  71111’一部才才 8082、クハ゛−勺゛フ六 第5図 22−シーサ°光 24−0−テ′I入り 261.灯物し7人” 284−コイル手段 9−1−可納昔1(A) 38−、芯体 42−1三ラー 44−、  可1りil:5(B) 郁−1粋初体 第6図 2− (5)、を丸字h 4−、 L、−V”た 61.デX入り 旦、、一対物し゛ノ入゛アクチュエータ10−11人身
40 124.ニフー +4、− yT物レしズ 16− コイル4−段
1 to 5 show an optical head according to an embodiment of the present invention, FIG. 1 is a plan view, FIG. 2 is a perspective view of the main part of FIG. 1, FIG. 3 is a front view, and FIG. is a side view, and Fig. 5 is an X-
The X-ray sectional view and FIG. 6 are side sectional views of main parts of a conventional optical head. 20 Fixed optical bench, 22. Laser light, 24...
Disk, 26... Objective lens, 28 Coil means, 30... Movable part (A), 36... Support column, 38
...Window body, 40. Support, 42...Mirror, 44
...Movable part (B), 46.Moving body, 52.Magnet, 54.Magnetic circuit, 56.Connection member,
58... Screw, 60... Axis, 70... Objective lens actuator, 72... Input aperture, 74° 76...
Cover member, 78... Output port, 80.82...
cover glass. Patent Applicant: Matsushita Electric Industrial Co., Ltd. Figure 3 20 Gokusakisaki 56. ,,! , Oya JOX, 76,,
Cover member 8271 Tsuma Gera person Fig. 4 54 FtL 9 parts 72. Incidence lower part, 76 71111' part talent 8082, K-261. 284-Coil Means 9-1-Kano Machi 1 (A) 38-, Core Body 42-1 Three Ra 44-, Ka1ri Il: 5 (B) Iku-1 Iki-Shutai No. 6 Figure 2- (5), rounded h 4-, L, -V” 61. When entering the De Nifu +4, - yT thing lesbian 16- coil 4-stage

Claims (1)

【特許請求の範囲】[Claims] 固定位置にあって、ディスクの半径方向に略平行光を放
射する光学台と、上記略平行光を上記ディスクの面方向
に反射する光反射手段と、上記光反射手段で反射された
上記略平行光を上記ディスク上に集光する対物レンズと
、上記対物レンズと一体的に構成され、上記対物レンズ
を上記ディスクの面方向および半径方向に電磁力によっ
て駆動するコイル手段と、上記コイル手段に駆動力を発
生させる磁気回路と、上記光反射手段と対物レンズとコ
イル手段とから成り、上記略平行光の進行方向に移動可
能な移動体と、上記移動体と磁気回路とから成る対物レ
ンズアクチュエータと、上記対物レンズアクチュエータ
を覆うカバー部材と、上記対物レンズアクチュエータに
上記略平行光が入射するよう上記カバーに設けた入射口
と、上記対物レンズによって集束された上記略平行光が
上記ディスク面の方向へ出射するよう上記対物レンズの
上記ディスク半径方向の移動幅にわたって上記カバー部
材に設けた出射口と、上記入射口と出射口をふさぐカバ
ーガラスを有することを特徴とする光学ヘッド。
an optical bench that is located at a fixed position and emits substantially parallel light in the radial direction of the disk; a light reflecting means that reflects the substantially parallel light in the surface direction of the disk; an objective lens that focuses light onto the disk; a coil means that is integrally formed with the objective lens and drives the objective lens in the surface direction and radial direction of the disk by electromagnetic force; and a coil means that is driven by the coil means. a movable body comprising a magnetic circuit that generates a force, the light reflecting means, an objective lens, and a coil means and movable in the direction in which the parallel light travels; an objective lens actuator comprising the movable body and the magnetic circuit; , a cover member that covers the objective lens actuator; an entrance hole provided in the cover so that the substantially parallel light is incident on the objective lens actuator; An optical head comprising: an exit aperture provided in the cover member over a movement width of the objective lens in the radial direction of the disk so as to emit light to the disk; and a cover glass that closes the entrance aperture and the exit aperture.
JP61194091A 1986-08-21 1986-08-21 Optical head Pending JPS6352339A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP61194091A JPS6352339A (en) 1986-08-21 1986-08-21 Optical head

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP61194091A JPS6352339A (en) 1986-08-21 1986-08-21 Optical head

Publications (1)

Publication Number Publication Date
JPS6352339A true JPS6352339A (en) 1988-03-05

Family

ID=16318799

Family Applications (1)

Application Number Title Priority Date Filing Date
JP61194091A Pending JPS6352339A (en) 1986-08-21 1986-08-21 Optical head

Country Status (1)

Country Link
JP (1) JPS6352339A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01204231A (en) * 1988-02-10 1989-08-16 Seiko Epson Corp Compact optical disk device
JPH04114387A (en) * 1990-09-05 1992-04-15 Mitsubishi Electric Corp Dust-proof mechanism for optical system in optical disk device

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60173730A (en) * 1985-01-25 1985-09-07 Hitachi Ltd Optical head device
JPS61122947A (en) * 1984-11-19 1986-06-10 Nippon Telegr & Teleph Corp <Ntt> Optical head

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61122947A (en) * 1984-11-19 1986-06-10 Nippon Telegr & Teleph Corp <Ntt> Optical head
JPS60173730A (en) * 1985-01-25 1985-09-07 Hitachi Ltd Optical head device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01204231A (en) * 1988-02-10 1989-08-16 Seiko Epson Corp Compact optical disk device
JPH04114387A (en) * 1990-09-05 1992-04-15 Mitsubishi Electric Corp Dust-proof mechanism for optical system in optical disk device

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