JPS6278741A - Optical recording and reproducing device - Google Patents
Optical recording and reproducing deviceInfo
- Publication number
- JPS6278741A JPS6278741A JP61199645A JP19964586A JPS6278741A JP S6278741 A JPS6278741 A JP S6278741A JP 61199645 A JP61199645 A JP 61199645A JP 19964586 A JP19964586 A JP 19964586A JP S6278741 A JPS6278741 A JP S6278741A
- Authority
- JP
- Japan
- Prior art keywords
- light
- recording
- recording disk
- light beam
- motor
- 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
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は光学的手段で情報を記録再生する装置に関し、
装置の動作時に生じる誤記録、あるいは記録材料の破損
等を防止することを目的とする。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for recording and reproducing information by optical means,
The purpose is to prevent erroneous recording or damage to recording materials that may occur during device operation.
一般Ｋ、光学的に情報を記録再生することが可能な記録
材料として、プラスチックサーミスタのように熱可逆性
を用いたものや、アモルファス半導体のように相転位を
用いたものなどがある。これらの記録材料はそれに照射
する光エネルギの強さを制御することによって情報の記
録、再生、あるいは消去が行なわれる。したがって情報
を記録。Generally speaking, recording materials capable of optically recording and reproducing information include those that use thermoreversibility, such as plastic thermistors, and those that use phase transition, such as amorphous semiconductors. Information is recorded, reproduced, or erased on these recording materials by controlling the intensity of light energy applied to them. Therefore record the information.
再生、消去する場合に、それぞれの機能に応じて材料の
性質にあった光エネルギを記録材料に供給する必要があ
る。すなわち、再生時の光エネルギ。When reproducing or erasing, it is necessary to supply the recording material with optical energy that matches the properties of the material according to each function. In other words, the light energy during playback.
記録時の光エネルギ、消去時の光エネルギ、また記録材
料が蒸発等で破損する光エネルギ等について考慮し、照
射光エネルギを選ぶ必要がある。一般に上記の各光エネ
ルギの間には次の関係がある。It is necessary to select the irradiation light energy in consideration of the light energy during recording, the light energy during erasing, the light energy that may damage the recording material due to evaporation, etc. Generally, the following relationship exists between each of the above-mentioned optical energies.
再生エネルギ〈記録エネルギ〈消去エネルギ〈破損エネ
ルギ
また、記録材料に吸収されるエネルギは、照射される光
エネルギの大きさとともに、記録材料の移送速度すなわ
ち記録材料が照射光を横切る速度にも依存する。すなわ
ち記録材料の一点が吸収するエネルギは、照射光の強さ
と、その点が照射光の下を通過する速度、およびその点
が吸収したエネルギを放散する速度に関係する。したが
って、最も弱い光エネルギを持つ情報再生光を照射した
場合でも記録材料が静止している場合には、光の照射部
位は前記記録エネルギ以上のエネルギを吸収し、局部的
に誤記録、更には記録材料の破損現象を起こすことにな
る。再生光より強い記録光を照射した時、記録材料が静
止していると再生光の時以上に破損現象を起こすことに
なる。このような現象は、アモルファス半導体等を記録
材料として使う光学的記録再生装置にあっては、信頼性
の面で重大な欠陥となる。Reproduction energy < Recording energy < Erasing energy < Damage energy The energy absorbed by the recording material depends not only on the magnitude of the irradiated light energy but also on the transport speed of the recording material, that is, the speed at which the recording material traverses the irradiated light. . That is, the energy absorbed by a point on the recording material is related to the intensity of the illumination light, the speed at which the point passes under the illumination light, and the speed at which the point dissipates the absorbed energy. Therefore, even when the information reproducing light with the weakest optical energy is irradiated, if the recording material is stationary, the irradiated area absorbs more energy than the recording energy, causing local erroneous recording and even This will cause damage to the recording material. If the recording material is stationary when it is irradiated with recording light that is stronger than the reproduction light, it will cause more damage than the reproduction light. Such a phenomenon becomes a serious defect in terms of reliability in optical recording/reproducing devices that use amorphous semiconductors or the like as a recording material.
本発明はこのような欠点に鑑み、記録媒体の移送速度の
変化によって生ずる誤記録や記録材料の破損を防止する
装置を提供するものである。In view of these drawbacks, the present invention provides an apparatus that prevents erroneous recording and damage to the recording material caused by changes in the transport speed of the recording medium.
以下、本発明の一実施例について第１図と共に説明する
。図において１はレーザ等の光源、２は光変調器でその
入射光とを端子３から入力される信号にもとづいて変調
し、出力光すを発生する。。An embodiment of the present invention will be described below with reference to FIG. In the figure, 1 is a light source such as a laser, and 2 is an optical modulator which modulates the incident light based on a signal input from a terminal 3 to generate an output light beam. .
この光変調器２からの出力光すは平板４に設けられた孔
を通過し、後述する対物レンズ８で十分光を絞ることが
できるように設けられた投影レンズ６を経る。この投影
レンズを通過し７た光すは全反射ミラ６によって光路が
変更され、ビームスプリッタ７を経て、前記対物レンズ
８に至る。そしてここで光すを十分絞って記録媒体であ
る記録円盤９に照射する。この記録円盤９は、アモルフ
ァス半導体の如き光感応性材料を、垣ビ等の樹脂基材に
塗布したものより成る。続いて光Ｃは記録円盤９の表面
からの反射光を示す。この反射光Ｃを前記ビームスプリ
ッタ７により入射光すより分離し、これを光検出器（図
示せず）にて受光することにより、情報の読み取りも、
前記対物レンズ８と記録円盤９との間隔を一定に保つだ
めのいわゆる焦点制御や、更には情報トラックのトラ・
ノキング制御等に使用するのであるが、ここではその詳
細は省く。The output light beam from the optical modulator 2 passes through a hole provided in a flat plate 4, and passes through a projection lens 6 provided so that the light can be sufficiently focused by an objective lens 8, which will be described later. The optical path of the light beam that has passed through this projection lens is changed by a total reflection mirror 6, passes through a beam splitter 7, and reaches the objective lens 8. Then, the light beam is sufficiently narrowed down and irradiated onto the recording disk 9, which is a recording medium. This recording disk 9 is made of a resin base material such as a wall plate coated with a photosensitive material such as an amorphous semiconductor. Subsequently, light C indicates reflected light from the surface of the recording disk 9. Information can also be read by separating this reflected light C from the incident light by the beam splitter 7 and receiving it with a photodetector (not shown).
There is so-called focus control to keep the distance between the objective lens 8 and the recording disk 9 constant, and also the information track tracking control.
It is used for knocking control, etc., but the details are omitted here.
上記記録円盤９は、モータ１０によりモータ軸１１のま
わりに回転させられる。また、モータ１Ｑを保持するス
ライド１１′は矢印入方向に移動し得る。このスライダ
１１′には光源１２とホトダイオード１３が互に対向す
るように設けである。The recording disk 9 is rotated around a motor shaft 11 by a motor 10. Furthermore, the slide 11' holding the motor 1Q can move in the direction of the arrow. A light source 12 and a photodiode 13 are provided on the slider 11' so as to face each other.
１４はモータ軸１１に固定された遮蔽板で、モータ軸１
１が１回転する毎に、少くとも１回、好ましくは複数回
前記光源１２より発せられた光が、ホトダイオード１３
へ到達するようにその外周部に孔あるいは歯形形状の切
欠部が設けられている。14 is a shielding plate fixed to the motor shaft 11;
1 rotates once, the light emitted from the light source 12 is transmitted at least once, preferably multiple times, to the photodiode 13.
A hole or a tooth-shaped notch is provided on the outer periphery so as to reach the hole.
まだこの孔等が複数個の場合には等間隔に設けられてい
る。１６は入力信号の周波数に応じた出力電圧を発生す
る周波数−電圧（Ｆ−Ｖ）コンバータ、端子１６は基準
電圧の入力端子である。１７はコンパレータで、前記Ｆ
−■コンバータ１６の出力電圧と端子１６からの基準電
圧を比較する。If there are a plurality of holes, they are provided at equal intervals. 16 is a frequency-voltage (F-V) converter that generates an output voltage according to the frequency of an input signal, and terminal 16 is an input terminal for a reference voltage. 17 is a comparator, and the F
-Compare the output voltage of the converter 16 and the reference voltage from the terminal 16.
コンパレータ１７の出力に応じて、スイッチ１８は開閉
され、該スイッチ１８の開閉により、光エネルギ減少手
段１９は動作する。本実施例ではＦ−■コンバータ１６
の出力電圧が基準電圧と等しいカッれより高い時、コン
パレータ１７の出力によりスイッチ１８を閉じるように
構成している。The switch 18 is opened or closed according to the output of the comparator 17, and the optical energy reduction means 19 is operated by opening or closing the switch 18. In this embodiment, the F-■ converter 16
When the output voltage is higher than a voltage equal to the reference voltage, the output of the comparator 17 closes the switch 18.
ここで上記光エネルギ減少手段１９について具体的に述
べる。第２図はその一実施例を示す。第２図において２
０はロータリンレノイドで、回転軸２１は、フィルタ２
２を保持する。ロータリンレノイド２Ｑへの通電、非通
電に対応してフィルタ２２は第２図に破線で示す０位置
（光路中にフィルタ２２が入らない位置）と実線で示す
８位置（光路中にフィルタ２２が入る位置）の２位置を
とる。また上記フィルタ２２は前記光ｄもしくは光すの
通過経路中に設け、前記８位置にあるときは光がフィル
タ２２を通過するように、０位置にある時は光と無関係
の位置になるように設定する。Here, the light energy reducing means 19 will be specifically described. FIG. 2 shows one embodiment. In Figure 2, 2
0 is a rotorinoid, and the rotating shaft 21 is a filter 2.
Hold 2. Corresponding to the energization and de-energization of the rotorinoid 2Q, the filter 22 is placed at the 0 position (position where the filter 22 does not enter the optical path) shown by the broken line in FIG. position). Further, the filter 22 is provided in the passage path of the light d or beam, so that when it is at the 8 position, the light passes through the filter 22, and when it is at the 0 position, it is at a position unrelated to the light. Set.
フィルタ２２の光透過率は、記録円盤９が静止している
時でも記録材料が記録エネルギに達しないように定めで
ある。The light transmittance of the filter 22 is determined so that the recording material does not reach the recording energy even when the recording disk 9 is stationary.
次に情報の記録動作について述べる。Next, the information recording operation will be described.
記録円盤９はモータ１０により回転速度Ｎ（Ｒ，Ｐ、Ｍ
）で回転させられる。この回転速度Ｎは、たとえばビデ
オディスクの如きは１０００回転が提唱されている。ま
た、記録トラックピッチ相当分だけ、スライダ１１′が
移動することによって、記録円盤９は回転しながらその
径方向に移動される。The recording disk 9 is rotated at a rotational speed N (R, P, M
) can be rotated. The rotational speed N is proposed to be 1000 rotations, for example, for video discs. Furthermore, by moving the slider 11' by an amount corresponding to the recording track pitch, the recording disk 9 is moved in its radial direction while rotating.
一方、光源１より発せられた光ａは、光変調器２で情報
信号に応じて変調され、この変調光すは対物レンズ８に
よって十分絞られて記録円盤９を照射し、記録材料がア
モルファス半導体なら、光学的濃淡として情報を渦巻状
トラックに記憶していく。この時、記録円盤９に照射す
る記録光エネルギは、記録円盤９が回転速度Ｎで定速回
転している時、記録材料に好適な前記記録エネルギを吸
収するよう定める。再生光エネルギの設定も同様で、定
速回転Ｎの時、記録材料が記録エネルギに達しないよう
定めるが、再生信号のＳ／Ｎという面から、一定レベル
以上の光エネルギを設定する。On the other hand, the light a emitted from the light source 1 is modulated by the optical modulator 2 according to the information signal, and this modulated light is sufficiently focused by the objective lens 8 and irradiates the recording disk 9, so that the recording material becomes an amorphous semiconductor. Then, information is stored in a spiral track as optical gradation. At this time, the recording light energy irradiated onto the recording disk 9 is determined so that when the recording disk 9 is rotating at a constant rotational speed N, the recording material absorbs the appropriate recording energy. The setting of the reproduction light energy is similar, and is set so that the recording material does not reach the recording energy when the rotation speed is constant N, but from the viewpoint of the S/N of the reproduction signal, the optical energy is set to be above a certain level.
この記録時と再生時の光エネルギの切り換えは操作釦の
操作に連動させて行なえる。詳細は省くが、定速回転Ｎ
の時、記録材料が前記消去エネルギを吸収するに充分な
光エネルギを発するような光源１を用い、第１図の光ａ
もしくは光すの経路中に、透過後、記録円盤９に照射さ
れる光が前述の再生光エネルギ、記録光エネルギ、消去
光エネルギになるような透過率をもたせたフィルタを設
け、このフィルタを操作釦と連動させて切り換えを行な
うよう構成することにより達成できる。The switching of the optical energy during recording and reproduction can be performed in conjunction with the operation of the operation button. Although the details are omitted, constant speed rotation N
At this time, using a light source 1 that emits enough light energy for the recording material to absorb the erasing energy, the light a shown in FIG.
Alternatively, a filter having a transmittance such that the light irradiated onto the recording disk 9 after passing through the beam becomes the aforementioned reproduction light energy, recording light energy, and erasing light energy is provided in the path of the light beam, and this filter is operated. This can be achieved by configuring the switching to be performed in conjunction with a button.
以上の如く、記録、再生時において記録円盤９が定速回
転Ｎで回転している時、記録円盤９には記録材料に好適
な記録光エネルギ、再生光エネルギを持つ光が照射され
る。As described above, when the recording disk 9 is rotating at a constant speed N during recording and reproduction, the recording disk 9 is irradiated with light having recording light energy and reproduction light energy suitable for the recording material.
次に、記録円盤９が静止状態から定速回転Ｎに達するま
での動作について述べる。Next, the operation of the recording disk 9 from a stationary state until it reaches constant speed rotation N will be described.
モータ軸１１が静止状態から回転しはじめると、モータ
軸１１に固定された前記遮蔽板１４によりホトダイオー
ド１３への光源１２からの光が遮断されたり解放された
りする。このためモータ軸１１の回転が早くなっていく
と、それに対応してホトダイオード１３の出力変化間隔
が短かくなる。そｊ、テＦ−Ｖ−ｙンバータ１６の出力
はモータ軸１１の回転が早くなるに従がって増大する。When the motor shaft 11 starts to rotate from a stationary state, the light from the light source 12 to the photodiode 13 is blocked or released by the shielding plate 14 fixed to the motor shaft 11. Therefore, as the rotation of the motor shaft 11 becomes faster, the interval between changes in the output of the photodiode 13 becomes correspondingly shorter. The output of the F-V-y inverter 16 increases as the motor shaft 11 rotates faster.
コンパレータ１７でＥ−Ｖコンバータ１６の出力と比較
する基準電圧は次の条件で定めである。The reference voltage to be compared with the output of the EV converter 16 by the comparator 17 is determined by the following conditions.
再生時、定速回転数Ｎの時定めた再生光で記録しない記
録円盤９の最低回転速度でモータ軸１１が回転している
時のＦ−Ｖコンバータ１５の出力以上、定速回転数Ｎで
回転している時のＦ−Ｖコンバータ１６の出力以下の電
圧に、余裕、信頼性を考慮して基準電圧を定める。した
がって、基準電圧より小さい出力をＦ−Ｖコンバータ１
６が発している時は、前記スイッチ１８は開の状態にあ
り、前記ロータリンレノイド２ｏは非道ｔｆ、−ｙイル
タ２２にて記録円盤９への照射光を減じている。During playback, at a constant rotation speed N, the output of the F-V converter 15 is greater than or equal to the output of the F-V converter 15 when the motor shaft 11 is rotating at the lowest rotation speed of the recording disk 9 that does not record with the determined reproduction light, and at a constant rotation speed N. The reference voltage is determined to be a voltage lower than the output of the F-V converter 16 during rotation, taking into consideration margin and reliability. Therefore, the output of the F-V converter 1 is smaller than the reference voltage.
6 is emitting light, the switch 18 is in an open state, and the rotary lens 2o reduces the light irradiated onto the recording disk 9 by means of the tf, -y filter 22.
基準電圧と等しいかそれより大きい出力をＦ −■コン
バータ１６が発するようにモータ軸１１の回転速度が上
がると、コンパレータ１７の出力によりスイッチ１８は
閉の状態になり、このスイッチ１８と連動もしくは直結
して、ロータリソレノイド２ｏへ通電される。このため
フィルタ２２はＥ位置からＤ位置に変わり、再生時には
、前記条件の再生光を、記録時には前記条件の記録光を
記録円盤に照射可能となる。When the rotational speed of the motor shaft 11 increases so that the F-■ converter 16 generates an output equal to or greater than the reference voltage, the switch 18 is closed by the output of the comparator 17, and the switch 18 is linked or directly connected. Then, the rotary solenoid 2o is energized. Therefore, the filter 22 changes from the E position to the D position, and the recording disk can be irradiated with the reproduction light under the above conditions during reproduction and the recording light under the above conditions during recording.
なお、上記実施例では光エネルギ減少手段１９の実施例
としてフィルタ２２を用いた構成を示したが、光を通さ
ない遮蔽板を使用して光ビームの照射を禁止してもよい
。また、光源１の電源をスイッチ１８により直接、もし
くはこれと連動させてオン、オフにするようにしてもよ
い。記録円盤９の回転速度の検知は、光源とホトダイオ
ードにて説明したが、マグネットと磁気ヘッドにて構成
することもできる。In the above embodiment, the filter 22 is used as an example of the light energy reducing means 19, but a shielding plate that does not transmit light may be used to prohibit the irradiation of the light beam. Further, the power source of the light source 1 may be turned on and off by the switch 18 directly or in conjunction with the switch 18. Although detection of the rotational speed of the recording disk 9 has been described using a light source and a photodiode, it can also be configured using a magnet and a magnetic head.
以上説明したように本発明によれば、情報信号により変
調された所定の記録強度の光ビームの照射により情報を
記録し、前記所定の強度より小さい再生光ビームの照射
により再生を行なう光学的記録再生装置において、再生
中故障あるいは外力等によりモータの回転が所定速度の
回転より減じた時、あるいは、起動時モータが停止状態
から所定の回転速度に達するまでの間、再生光ｔ′＾ム
の記録円盤への照射を禁止もしくは減少させるので再生
光ビームによる誤記録を防止できる。また再生光を記録
媒体移送用の回転体の定速回転数の近傍についてのみ、
主に考慮した最適強さの光を定めることができるのでＳ
／Ｎ面で有効に光を利用できる。As explained above, according to the present invention, information is recorded by irradiation with a light beam having a predetermined recording intensity modulated by an information signal, and information is reproduced by irradiation with a reproduction light beam having a lower intensity than the predetermined intensity. In the reproducing device, when the rotation of the motor decreases below the predetermined rotation speed due to a failure or external force during regeneration, or when the motor reaches the predetermined rotation speed from a stopped state at startup, the regeneration light t'^m is turned off. Since irradiation to the recording disk is prohibited or reduced, erroneous recording by the reproduction light beam can be prevented. In addition, the reproduction light is applied only to the vicinity of the constant rotation speed of the rotating body for transporting the recording medium.
S
/N-plane allows effective use of light.
第１図は本発明の一実施例における光学的記録再正装置
を示す構成図、第２図は同装置を構成する光減少手段の
一具体構成例を示す斜視図である。
１・・・・・・光源、２・・・・・・光変調器、６・・
・・・・投影レンズ、６・・・・・・全反射ミラ、８・
・・・・・封部レンズ、９・・・・・・記録円盤、１０
・・・・・・モータ、１１′・・・・・・スライダ、１
６・・・・・・Ｆ−Ｖコンバータ、１７・・・・・・コ
ンパレータ、１９・・・・・・光減少手段、２０・・・
・・・ロータリンレノイド、２２・・・・・・フィルタ
。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
第２図FIG. 1 is a block diagram showing an optical recording and reproducing device according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a specific example of the structure of light reduction means constituting the device. 1...Light source, 2...Light modulator, 6...
...Projection lens, 6... Total reflection mirror, 8.
... Sealing lens, 9 ... Recording disk, 10
...Motor, 11'...Slider, 1
6... F-V converter, 17... Comparator, 19... Light reduction means, 20...
...Rotarin Lenoid, 22...Filter. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2
Claims (1)
ムの照射により情報が記録され、前記所定の強度より小
さい再生光ビームの照射により情報が再生される記録円
盤と、前記記録円盤の回転速度を電気的に検知する検知
手段と、前記記録円盤の所定回転速度に対応して定めら
れた基準信号と前記検知手段の出力信号とを比較する比
較手段と、この比較手段の出力によって動作せしめられ
前記記録円盤への前記再生光ビームの照射を禁止もしく
は減少せしめる光減少手段とを有し、前記記録円盤が前
記基準信号に対応した回転速度に達するまでは、前記再
生光ビームを禁止もしくは減少せしめ前記記録円盤への
再生光ビームによる記録を防止するように構成したこと
を特徴とする光学的記録再生装置。A recording disk on which information is recorded by irradiation with a light beam of a predetermined recording intensity in a state of rotation at a predetermined speed, and information is reproduced by irradiation with a reproduction light beam having a lower intensity than the predetermined intensity, and a rotation speed of the recording disk. a detection means for electrically detecting; a comparison means for comparing the output signal of the detection means with a reference signal determined corresponding to a predetermined rotation speed of the recording disk; and a comparison means for comparing the output signal of the detection means; and a light reduction means for prohibiting or reducing irradiation of the reproduction light beam onto the recording disk, and inhibiting or reducing the reproduction light beam until the recording disk reaches a rotational speed corresponding to the reference signal. An optical recording and reproducing device characterized in that it is configured to prevent recording by a reproducing light beam onto a recording disk.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61199645A JPS6278741A (en) | 1986-08-26 | 1986-08-26 | Optical recording and reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61199645A JPS6278741A (en) | 1986-08-26 | 1986-08-26 | Optical recording and reproducing device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP50143634A Division JPS6057135B2 (en) | 1975-12-01 | 1975-12-01 | optical recording and reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6278741A true JPS6278741A (en) | 1987-04-11 |
Family
ID=16411295
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61199645A Pending JPS6278741A (en) | 1986-08-26 | 1986-08-26 | Optical recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6278741A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03291249A (en) * | 1989-12-25 | 1991-12-20 | Mitsui Toatsu Chem Inc | Production of bisphenol a |
| JPH0567128U (en) * | 1992-02-07 | 1993-09-03 | 孝次 広野 | Wiring duct |
| JP2002074855A (en) * | 2000-09-04 | 2002-03-15 | Sony Corp | Disk shaped recording medium and disk driving device |
| WO2007086171A1 (en) * | 2006-01-27 | 2007-08-02 | Matsushita Electric Industrial Co., Ltd. | Optical pickup and information processing device |
| WO2007097239A1 (en) * | 2006-02-22 | 2007-08-30 | Matsushita Electric Industrial Co., Ltd. | Optical pickup device and information processor |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5267302A (en) * | 1975-12-01 | 1977-06-03 | Matsushita Electric Ind Co Ltd | Optical recording and reproduction device |
-
1986
- 1986-08-26 JP JP61199645A patent/JPS6278741A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5267302A (en) * | 1975-12-01 | 1977-06-03 | Matsushita Electric Ind Co Ltd | Optical recording and reproduction device |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03291249A (en) * | 1989-12-25 | 1991-12-20 | Mitsui Toatsu Chem Inc | Production of bisphenol a |
| JPH0567128U (en) * | 1992-02-07 | 1993-09-03 | 孝次 広野 | Wiring duct |
| JP2002074855A (en) * | 2000-09-04 | 2002-03-15 | Sony Corp | Disk shaped recording medium and disk driving device |
| WO2007086171A1 (en) * | 2006-01-27 | 2007-08-02 | Matsushita Electric Industrial Co., Ltd. | Optical pickup and information processing device |
| WO2007097239A1 (en) * | 2006-02-22 | 2007-08-30 | Matsushita Electric Industrial Co., Ltd. | Optical pickup device and information processor |
| US7859980B2 (en) | 2006-02-22 | 2010-12-28 | Panasonic Corporation | Optical pickup device and information processor |
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