JPS6154050A - Light pickup - Google Patents

Light pickup

Info

Publication number
JPS6154050A
JPS6154050A JP59175517A JP17551784A JPS6154050A JP S6154050 A JPS6154050 A JP S6154050A JP 59175517 A JP59175517 A JP 59175517A JP 17551784 A JP17551784 A JP 17551784A JP S6154050 A JPS6154050 A JP S6154050A
Authority
JP
Japan
Prior art keywords
light
objective lens
photoelectric conversion
conversion element
disk
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
JP59175517A
Other languages
Japanese (ja)
Inventor
Takafumi Sugano
菅野 隆文
Kazuo Momoo
和雄 百尾
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 JP59175517A priority Critical patent/JPS6154050A/en
Priority to JP59175516A priority patent/JPS6154049A/en
Publication of JPS6154050A publication Critical patent/JPS6154050A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B19/00Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02Control of operating function, e.g. switching from recording to reproducing
    • G11B19/10Control of operating function, e.g. switching from recording to reproducing by sensing presence or absence of record in accessible stored position or on turntable
    • GPHYSICS
    • G11INFORMATION STORAGE
    • G11BINFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08Disposition or mounting of heads or light sources relatively to record carriers

Abstract

PURPOSE:To utilize an actuator for a servo system, etc., and to miniaturize a light pickup by disposing photoelectric transfer elements on the interior of the rotating actuator and detecting some part of light incident on a disk at the time of recording and reproducing. CONSTITUTION:Photoelectric transfer elements 22 and 23 are disposed at the interior of a rotating actuator. Light from a window 16 through a beam spliter 21 and some part of the light led in the photoelectric transfer element 22 are used for monitoring and displaying the light intensity of a light source and for a light intensity stabilizating servo, light modulation monitor, etc. Only the light reflected by a disk is made incident on the transfer element 23, and used for detecting the presence or absence of the disk and for a reflecting ratio monitor, etc. Thus, since the actuator is utilized as some part of the mechanism of the servo system, etc., necessary for the light pickup, the light pickup can be miniaturized.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、光学式ビデオディスク、コンノ;クトデジタ
ルオーディオディスク、静止画ディスクファイル、fジ
タルデーターファイル等の各種光ディスクの記録再生に
使用される光ピックアップ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 pickup used for recording and reproducing various optical discs such as optical video discs, computer digital audio discs, still image disc files, f-digital data files, etc. It is related to.

従来例の構成とその問題点 回動型のアクチュエーターを利用した従来の光ピックア
ップの基本構成を第1図を用いて説明する。第1図中、
1は対物レンズ保持筒で、回動中心軸に対して偏心した
位置に取り付けられた対物レンズ2を保持する。対物レ
ンズ保持筒は回動軸受3と結合しており、回動軸受3は
ヨーク部5に固定された回動軸4に挿入され、対物レン
ズ保持筒全回動輪中心に対し、トラッキング方向に回動
可能となる。また、回動軸受3は回動軸4内で摺動可能
で、対物レンズ保持筒1はフォーカシング方向にも可動
する。ここで、回動軸受3がなめらかに回転および摺動
するように例えば回動軸4は自で潤滑性を有するプラス
チック材で形成され、回動軸受3もアルミニウム等の非
鉄金属やセラミツク等で形成されている。ヨーク部5の
外周部にリング状のマグネット6が装着され、その上に
外周ヨーク7が装着されている。外周ヨーク7はヨーク
壁と切欠部(図示せず)より構成され、ヨーク壁と切欠
部は円周方向に90度分割で対称な位置に2つ配置され
ている。図示していない内周ヨークも同様にヨーク壁と
切欠部より構成され、外周ヨーク7と内周ヨークは互い
にヨーク壁と切欠部が各々対向するように配置されてい
る。内周ヨーク壁とヨーク部6とマグネット6、外周ヨ
ーク7の間に磁気回路が形成され、内外周ヨークの各ヨ
ーク壁の間に対物レンズ保持筒部1の外周部が挿入され
る。フォーカシングコイル9 (!: ト5 yキング
コイル(図示せず)は対物レンズ保持筒1の外周上に配
置される。フォーカシングコイル9は円周方向に巻かれ
、このコイルに電流を流すことにより、コイルには回動
中心軸方向の力が働き、電流の方向と電流値により対物
レンズ保持筒1の回動中心軸方向の動きを制御し、フォ
ーカシングを行う。トラッキングコイルは方形状に巻か
れておシ、4つのトラッキングコイルが対物レンズ保持
筒1の外周上に配置されている。各々のトラッキングコ
イルは半分が磁気空隙内に位置し、残り半分は切欠部に
位置する。このコイルに電流を流すと、磁気空隙内に位
置するコイルは回動輪円周方向に力が働き、電流の方向
と電流値により対物レンズ保持筒1の回動輪円周方向の
動きを制御し、トラッキングを行う。16は窓で、光源
よりの光を回動型アクチュエーター内に導き、その後対
物レンズ2に光を導びく。
Conventional Structure and Problems The basic structure of a conventional optical pickup using a rotary actuator will be explained with reference to FIG. In Figure 1,
Reference numeral 1 denotes an objective lens holding cylinder that holds an objective lens 2 that is mounted eccentrically with respect to the central axis of rotation. The objective lens holding tube is connected to a rotation bearing 3, and the rotation bearing 3 is inserted into a rotation shaft 4 fixed to a yoke part 5, and the objective lens holding tube is rotated in the tracking direction with respect to the center of the rotation wheel. It becomes possible to move. Further, the rotation bearing 3 is slidable within the rotation shaft 4, and the objective lens holding cylinder 1 is also movable in the focusing direction. Here, in order for the rotation bearing 3 to rotate and slide smoothly, the rotation shaft 4 is made of a plastic material that has its own lubricity, and the rotation bearing 3 is also made of a non-ferrous metal such as aluminum or ceramic. has been done. A ring-shaped magnet 6 is attached to the outer circumference of the yoke portion 5, and an outer circumferential yoke 7 is attached thereon. The outer yoke 7 is composed of a yoke wall and a notch (not shown), and the yoke wall and the notch are arranged in two symmetrical positions separated by 90 degrees in the circumferential direction. The inner yoke (not shown) is similarly composed of a yoke wall and a notch, and the outer yoke 7 and the inner yoke are arranged such that the yoke wall and the notch face each other. A magnetic circuit is formed between the inner circumferential yoke wall, the yoke portion 6, the magnet 6, and the outer circumferential yoke 7, and the outer circumferential portion of the objective lens holding cylinder portion 1 is inserted between each yoke wall of the inner and outer circumferential yokes. Focusing coil 9 (!: 5 y King coil (not shown) is arranged on the outer periphery of objective lens holding cylinder 1. Focusing coil 9 is wound in the circumferential direction, and by passing a current through this coil, A force acts on the coil in the direction of the rotational center axis, and the movement of the objective lens holding tube 1 in the direction of the rotational center axis is controlled by the current direction and current value to perform focusing.The tracking coil is wound in a rectangular shape. Four tracking coils are arranged on the outer periphery of the objective lens holding tube 1.Half of each tracking coil is located in the magnetic gap, and the other half is located in the notch.A current is applied to this coil. When the current flows, a force acts on the coil located in the magnetic gap in the circumferential direction of the rotating wheel, and the direction and value of the current control the movement of the objective lens holding cylinder 1 in the circumferential direction of the rotating wheel, thereby performing tracking.16 is a window that guides light from a light source into a rotating actuator, and then guides the light to an objective lens 2.

このように構成されたアクチェエータ−を用いて光ピッ
クアップを構成する場合、各種サーボ系の検出光学系や
信号再生検出系などはすべて回動型アクチュエーターの
外部に配置されており、元ピックアップとして考えた場
合の寸法はかなり大きく、再生機全体を小形にできない
という問題を有していた。
When constructing an optical pickup using an actuator configured in this way, the detection optical system of various servo systems, signal regeneration detection system, etc. are all placed outside the rotary actuator. The size of the playback device is quite large, and there is a problem in that the entire playback machine cannot be made compact.

発明の目的 本発明は、回動型アクチュエーターを利用した光ピック
アップの小型化をはかることを目的とする。
OBJECT OF THE INVENTION The object of the present invention is to reduce the size of an optical pickup using a rotary actuator.

発明の構成 本発明の光ピックアップは、回動型アクチュエーターの
持つ利点を生かしつつ、かつ光ピツクアンプとして小型
化をはかるために、回動アクチュエーター内に信号の記
録、再生などに用いる光源よりの光を検出する光電変換
素子を配置し、各種サーボ系の検出や再生信号の検出を
行うように構成したことを特長とする。
Structure of the Invention The optical pickup of the present invention takes advantage of the advantages of a rotary actuator, and in order to achieve miniaturization as an optical pickup amplifier, the optical pickup incorporates light from a light source used for recording and reproducing signals within the rotary actuator. It is characterized by a configuration in which a photoelectric conversion element for detection is arranged to detect various servo systems and reproduced signals.

実施例の説明 本発明の一実施例を第2図に示す。図中、21は数−程
度の反射率を有するビームスプリッタ−で、ヨ〜り部5
に固定されている。窓16より回動アクチュエーター内
に導びかれた光源よりの光はビームスプリッタ−21に
より光の一部が光電変換素子22に導びかれ、光源より
の光強度をモニターし、表示したシ、光強度安定化サー
ボ、光源点灯確認、光変調モニター等に使用される。
DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention is shown in FIG. In the figure, reference numeral 21 denotes a beam splitter having a reflectance of several degrees, and the yaw portion 5
Fixed. Part of the light from the light source guided into the rotary actuator through the window 16 is guided by the beam splitter 21 to the photoelectric conversion element 22, which monitors the light intensity from the light source and displays the displayed image. Used for intensity stabilization servo, light source lighting confirmation, light modulation monitor, etc.

また、ビームスプリッタ−21に対して反射側に配置さ
れた光電変換素子23には、対物レンズ2より出射した
光が、ディスクなどによって反射された場合のみ光が入
射する。このためのディスクの有無やディスクの反射率
モニターなどに利用できる。
Further, light enters the photoelectric conversion element 23 arranged on the reflective side with respect to the beam splitter 21 only when the light emitted from the objective lens 2 is reflected by a disk or the like. For this purpose, it can be used to check whether a disc is present or to monitor the reflectance of the disc.

本発明の他の実施例を第3図に示す。図中、24は二分
割充電変換素子で、紙面に垂直方向に二分割されている
。X方向よりみた二分割光電変換素子24を第3図すに
示す。第3図すで矢印はトラック方向を示す。このよう
に二分割光電変換素子24を配置することにより、対物
レンズ2の焦点位置にディスクを配置した場合、ディス
ク上の溝あるいはビットよりの71−フィールド分布が
2分割光電変換素子24上で読み出し又は書き込みスポ
ットと溝またはビットの相対位置の変化に対応して変化
するので、各々の光電変換素子出力の差動をとることに
より、トラッキング誤差信号の検出ができる。但し、こ
の場合溝またはピット深さは光源の波長λに対してλ/
8程度に形成することが望ましい。
Another embodiment of the invention is shown in FIG. In the figure, 24 is a two-part charge conversion element, which is divided into two in the direction perpendicular to the plane of the paper. FIG. 3 shows the two-split photoelectric conversion element 24 viewed from the X direction. In FIG. 3, the arrow indicates the track direction. By arranging the two-split photoelectric conversion element 24 in this way, when the disk is placed at the focal position of the objective lens 2, the 71-field distribution from the groove or bit on the disk can be read out on the two-split photoelectric conversion element 24. Alternatively, since the tracking error signal changes in response to changes in the relative position of the writing spot and the groove or bit, the tracking error signal can be detected by taking the differential output of each photoelectric conversion element. However, in this case, the depth of the groove or pit is λ/with respect to the wavelength λ of the light source.
It is desirable to form it to about 8.

本発明の更に他の実施例を第4図に示す。2゜はヨーク
部5に取り付けられたナイフェツジで、う!イスク面上
に対物レンズ2が焦点を結んだ場合に、ディスクより反
射された光がビームスプリッタ−21で反射された光の
半分を遮へいするように配置されている。二分割光電変
換素子25はヨーク部5に固定されている。この光電変
換素子25は、回動中心軸方向に26a、25bとに分
割されている。このようにナイフェツジ20を配置する
ことにより、二分割光電変換素子25の出力の差動信号
は、ディスク位置と対物レンズ2の焦点位置との相対関
係により、ディスク上に焦点を結んだ場合の0中心に+
−で変化し、フォーカス誤差信号を検出できる。この信
号検出については、前述のフォーカスおよびトラッキン
グ検出用の各々の光電変換素子出力を加算することによ
り検出することが可能である。
Still another embodiment of the invention is shown in FIG. 2° is the knife attached to the yoke part 5. Ugh! The beam splitter 21 is arranged so that when the objective lens 2 focuses on the disk surface, half of the light reflected from the disk is blocked by the beam splitter 21. The two-split photoelectric conversion element 25 is fixed to the yoke portion 5. This photoelectric conversion element 25 is divided into 26a and 25b in the rotation center axis direction. By arranging the knife 20 in this way, the differential signal output from the two-split photoelectric conversion element 25 is adjusted to zero when focused on the disk, depending on the relative relationship between the disk position and the focal position of the objective lens 2. + in the center
The focus error signal can be detected. This signal detection can be performed by adding the outputs of the photoelectric conversion elements for focus and tracking detection described above.

第5図に本発明の更に他の実施例を示す。図中、26は
偏光ビームスプリッタ−で、光源よりの光は直勝偏波で
アクチュエーター内への入射時に偏光ビームスプリッタ
−26を全透過するように偏波面が調整させている。2
7はλ/4板で、偏光ビームスプリッタ−26上に固定
されている。
FIG. 5 shows still another embodiment of the present invention. In the figure, 26 is a polarizing beam splitter, and the plane of polarization is adjusted so that the light from the light source is directly polarized and completely passes through the polarizing beam splitter 26 when it enters the actuator. 2
7 is a λ/4 plate fixed on the polarizing beam splitter 26.

λ/4板2板金7過し対物レンズ2より出射し、ディス
クにより反射された光は再びλ/4板2板金7、。
The light passes through the λ/4 plate 2 sheet metal 7, exits from the objective lens 2, and is reflected by the disk, and then passes through the λ/4 plate 2 sheet metal 7 again.

を通ることにより、偏光ビームスグリツタ−26により
全反射され、偏光ビームスプリッタ−26上に固定され
たシリンドリカルレンズ2Tを通過した後に4分割光電
変換素子29へ導びかれる。
By passing through the polarizing beam splitter 26, the light is totally reflected, and after passing through the cylindrical lens 2T fixed on the polarizing beam splitter 26, it is guided to the 4-split photoelectric conversion element 29.

このように構成された光学系は、一般的に非点収差方式
と呼ばれ、検出器上のビーム形状がディスクの位置に応
じて楕円→真円→楕円と変化することを利用してフォー
カス信号を検出する。光電変換素子29のX方向視野図
を第5図すに示す。この場合、フォーカス誤差信号の検
出は光電変換素子4Qaと40Cを加算した信号と、4
0bと4odを加算した信号との差動を取ることにより
実現する。トラ、キング誤差信号の検出は光電変換素子
4 Q aと40dを加算した信号とa□bと40cを
加算した信号との差動を取ることによって検出できる。
An optical system configured in this way is generally called an astigmatism method, and uses the fact that the beam shape on the detector changes from ellipse to perfect circle to ellipse depending on the position of the disk to generate a focus signal. Detect. An X-direction field view of the photoelectric conversion element 29 is shown in FIG. In this case, the focus error signal is detected using a signal obtained by adding photoelectric conversion elements 4Qa and 40C, and a signal obtained by adding photoelectric conversion elements 4Qa and 40C.
This is realized by taking the difference between the signal obtained by adding 0b and 4od. The tiger and king error signals can be detected by taking the difference between the signal obtained by adding up photoelectric conversion elements 4Q a and 40d and the signal obtained by adding together a□b and 40c.

また、再生信号は光電変換素子40&〜40dの各々の
出力を加算することによって得られる。以上のような構
成にすることにより、前述の実施例を組み合わせた場合
と同様の効果を得るものである。
Further, the reproduced signal is obtained by adding the outputs of each of the photoelectric conversion elements 40 & to 40d. With the above configuration, the same effects as those obtained by combining the above-described embodiments can be obtained.

本発明の他の実施例を第6図に示す。図中、3oはビー
ムスプリ、ター21をヨーク部6に固定するための固定
治具で、2分割光電変換素子31が対物レンズ保持筒1
の内側に固定されている。窓16より入射した光はビー
ムスプリッタ−21により、入射した光の一部が2分割
光電変換素子31に導びかれる。光電変換素子31のX
方向視野図を第6図すに示す。このように構成した場合
、対物レンズ保持筒1が中立点位置にある場合に、光電
変換素子に入射する光が各々の光電変換素子の中心に位
置するように更正し、各々の光電変換素子出力の差動を
とることによって回動型アクチュエーター〇回動位置の
検出が可能となる。
Another embodiment of the invention is shown in FIG. In the figure, 3o is a fixing jig for fixing the beam splitter 21 to the yoke part 6, and the two-split photoelectric conversion element 31 is attached to the objective lens holding cylinder 1.
is fixed inside. A portion of the light incident through the window 16 is guided to a two-split photoelectric conversion element 31 by a beam splitter 21 . X of photoelectric conversion element 31
The directional field view is shown in Figure 6. With this configuration, when the objective lens holding cylinder 1 is at the neutral point position, the light incident on the photoelectric conversion elements is adjusted so that it is located at the center of each photoelectric conversion element, and the output of each photoelectric conversion element is adjusted. By taking a differential, it is possible to detect the rotational position of the rotational actuator.

この信号は中立点への復帰信号やランダムアクセス時の
光ピックアップの位置信号として利用できる。また、2
分割光電変換素子のかわりに、1次元のポジションセン
サーを利用することによっても同様の効果が得られる。
This signal can be used as a return signal to a neutral point or as an optical pickup position signal during random access. Also, 2
A similar effect can be obtained by using a one-dimensional position sensor instead of a split photoelectric conversion element.

1次元ポジションセンサーは、センサー上のスボ、ト位
置により出力電圧が変化するセンサーである。この場合
も、中立点の更正は必要となる。
A one-dimensional position sensor is a sensor whose output voltage changes depending on the position of the groove on the sensor. In this case as well, correction of the neutral point is necessary.

発明の効果 以上の如く本発明によれば、回動型アクチュエーター内
に光電変換素子を配置し、記録、再生。
Effects of the Invention As described above, according to the present invention, a photoelectric conversion element is disposed within a rotary actuator to perform recording and reproduction.

あるいは消去用などのディスク上に照射する光の1部を
検出することにより、従来の構成で問題となっていた光
ピックアップを大幅に小型化できるという利点を有する
ものである。
Alternatively, by detecting a portion of the light irradiated onto the disk for erasing, etc., it has the advantage that the optical pickup, which has been a problem with conventional configurations, can be significantly miniaturized.

なお、本発明は、光電変換素子の使用目的や、信号検出
のだめの光学系の配置または組み合わせは問わないもの
である。
Note that the present invention does not care about the purpose of use of the photoelectric conversion element or the arrangement or combination of the optical system for signal detection.

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

第1図は従来の回動型アクチュエーターの構成図、第2
図は本発明の一実施例である光ピックアップの構成図、
第3図、第4図、第5図、第6図は本発明の他の実施例
である光ビックアップを示し、それぞれdは構成図、b
は光電変換素子の矢祝図である。 1・・・・・・対物レンズ保持筒、2・・・・・・対物
レンズ、3・・・・・・回動軸受、4・・・・・・回動
軸、5・・・・・・ヨーク、6・・・・・・マグネット
、7・・・・・外周ヨーク、9・・・・・・フォーカシ
ングコイル、16・・・・・・g、21.26・・・・
・・ビームスプリッタ−122,23,24,25゜2
9・・・・・・光電変換素子、27・・・・・・λ/4
板、28・・・・・・シリンドリカルレンズ、30・・
・・・・固定ホルダO 代理人の氏名 弁理士 中 尾 敏 男 ほか1名第 
1 図 第2図 第31!l     (”J ill) 第6図     ((L)
Figure 1 is a configuration diagram of a conventional rotary actuator, Figure 2
The figure is a configuration diagram of an optical pickup that is an embodiment of the present invention.
3, 4, 5, and 6 show optical pickups that are other embodiments of the present invention, where d is a block diagram and b is a block diagram, respectively.
is a diagram of a photoelectric conversion element. 1...Objective lens holding tube, 2...Objective lens, 3...Rotation bearing, 4...Rotation shaft, 5...・Yoke, 6...Magnet, 7...Outer yoke, 9...Focusing coil, 16...g, 21.26...
...Beam splitter-122, 23, 24, 25°2
9...Photoelectric conversion element, 27...λ/4
Plate, 28... Cylindrical lens, 30...
...Fixed holder O Name of agent Patent attorney Toshio Nakao and 1 other person
1 Figure 2 Figure 31! l (”J ill) Figure 6 ((L)

Claims (1)

【特許請求の範囲】[Claims] 回動中心軸のまわりに回動可能でかつ前記回動中心軸の
軸方向に摺動可能な対物レンズ保持筒と、前記対物レン
ズ保持筒の前記回動軸中心軸より偏心したる位置に設け
られた対物レンズと、前記対物レンズ保持筒を前記2軸
方向に駆動するための手段を有する回動型アクチュエー
ターと、光源よりの光を前記対物レンズに導く手段を備
え、前記対物レンズにより前記光源よりの光をほぼ日折
限界まで集光し、情報を光学的に記録、再生、消去の少
なくとも1つの機能を実現するための光ピックアップで
あって、前記光源よりの光の少なくとも一部を検出する
ための光電変換素子を前記回動型アクチュエーター内に
配置したことを特徴とする光ピックアップ。
an objective lens holding tube that is rotatable around a rotational center axis and slidable in the axial direction of the rotational center axis; and an objective lens holding tube provided at a position eccentric from the rotational center axis of the objective lens holding tube. a rotating actuator having means for driving the objective lens holding tube in the two axial directions, and means for guiding light from the light source to the objective lens, the objective lens causing the light source to An optical pickup for realizing at least one function of optically recording, reproducing, and erasing information by condensing light to almost the diurnal limit, and detecting at least a part of the light from the light source. 1. An optical pickup, characterized in that a photoelectric conversion element for performing a photoelectric conversion is disposed within the rotary actuator.
JP59175517A 1984-08-23 1984-08-23 Light pickup Pending JPS6154050A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP59175517A JPS6154050A (en) 1984-08-23 1984-08-23 Light pickup
JP59175516A JPS6154049A (en) 1984-08-23 1984-08-23 Light pickup

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP59175517A JPS6154050A (en) 1984-08-23 1984-08-23 Light pickup
JP59175516A JPS6154049A (en) 1984-08-23 1984-08-23 Light pickup

Publications (1)

Publication Number Publication Date
JPS6154050A true JPS6154050A (en) 1986-03-18

Family

ID=26496765

Family Applications (2)

Application Number Title Priority Date Filing Date
JP59175517A Pending JPS6154050A (en) 1984-08-23 1984-08-23 Light pickup
JP59175516A Pending JPS6154049A (en) 1984-08-23 1984-08-23 Light pickup

Family Applications After (1)

Application Number Title Priority Date Filing Date
JP59175516A Pending JPS6154049A (en) 1984-08-23 1984-08-23 Light pickup

Country Status (1)

Country Link
JP (2) JPS6154050A (en)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58194151A (en) * 1982-05-10 1983-11-12 Sony Corp Optical pickup device

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS544608A (en) * 1977-06-11 1979-01-13 Miyoko Watanabe Electronic typewriter

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58194151A (en) * 1982-05-10 1983-11-12 Sony Corp Optical pickup device

Also Published As

Publication number Publication date
JPS6154049A (en) 1986-03-18

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