JPS60239929A - Optical recording and reproducing device - Google Patents
Optical recording and reproducing deviceInfo
- Publication number
- JPS60239929A JPS60239929A JP59096814A JP9681484A JPS60239929A JP S60239929 A JPS60239929 A JP S60239929A JP 59096814 A JP59096814 A JP 59096814A JP 9681484 A JP9681484 A JP 9681484A JP S60239929 A JPS60239929 A JP S60239929A
- Authority
- JP
- Japan
- Prior art keywords
- semiconductor laser
- recording
- output
- power
- recorded
- 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
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B19/00—Driving, 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
- G11B19/02—Control of operating function, e.g. switching from recording to reproducing
- G11B19/04—Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording 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
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は光感応性記録材料を付着した円盤状記録坦体（
以後ディスクと称す）に、半導体レーザ２・こ−″
の如き光ビームを１７１ｍ程度の微少光に絞り照射する
ことによって、映像信号−やディジタル信号等の信号を
凹凸あるいは濃淡等の変化として高密度に記録再生を行
なう装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a disc-shaped recording medium (
By irradiating the disk (hereinafter referred to as a disk) with a light beam such as a semiconductor laser 2.'', condensed to a minute beam of about 171 m, signals such as video signals and digital signals are converted into high-density data as unevenness or changes in density. The present invention relates to a device for recording and reproducing data.
従来例の構成とその問題点
光学的記録再生装置において、信号の記録は、ディスク
の記録薄膜にレーザ光等を照射して前記記録薄膜の光照
射部を溶融蒸発させたり、反射率や透過率を変化させた
りすることによって記録が行なわれる。すなわちレーザ
光のエネルギを熱的に利用して、記録材料の光学特性を
変化させることが一般的に行なわれる。Conventional configuration and problems In optical recording and reproducing devices, signals are recorded by irradiating the recording thin film of the disk with a laser beam or the like to melt and evaporate the light irradiated portion of the recording thin film, or by changing the reflectance and transmittance. Recording is performed by changing the That is, it is common practice to thermally utilize the energy of laser light to change the optical properties of a recording material.
以上の様な光学的記録再生装置について以下図を用いて
説明を行なう。The optical recording/reproducing apparatus as described above will be explained below using the drawings.
第１図は、光学的記録再生装置の一従来例を示したもの
である。第１図において、端子Ａには、映像信号やディ
ジタル信号等の記録信号を入力として加える。１はディ
スクに記録すべき光ビームを発生する半導体レーザ２を
駆動する半導体レーザ駆動回路である。点線で囲むＣは
、光学ヘッド３ ・−２一
部を示し、半導体レーザ２．レンズ３．光ビームを分割
する為のビームスプリッタ４．ｌ・ラッキング制御を行
なう為のトラッキングミラー５．フォーカス制御等を行
なう為のボイスコイル１６に組込壕れたレンズ６、再生
光を収束する為のレンズ７等で構成する。８は再生信号
を得る為にディスク９からの反射光を受光し電気信号に
変換する為の光電変換器である。ディスク９には同心固
状及びスパイラル状の案内トラック１０が形成されてお
り、又各々の案内トラック１０には個有の番地信号が予
め設けである。又ディスク９は、モータ１１で例えば１
８００ｒｐｍ等で定速で回転する。FIG. 1 shows a conventional example of an optical recording/reproducing device. In FIG. 1, a recording signal such as a video signal or a digital signal is input to terminal A. Reference numeral 1 denotes a semiconductor laser drive circuit that drives a semiconductor laser 2 that generates a light beam to be recorded on a disc. C surrounded by a dotted line indicates a part of the optical head 3.-2, and the semiconductor laser 2. Lens 3. Beam splitter for splitting the light beam4. l.Tracking mirror for racking control5. It is composed of a lens 6 embedded in a voice coil 16 for performing focus control, etc., a lens 7 for converging reproduced light, and the like. Reference numeral 8 denotes a photoelectric converter for receiving reflected light from the disk 9 and converting it into an electric signal in order to obtain a reproduction signal. Concentric solid and spiral guide tracks 10 are formed on the disk 9, and each guide track 10 is pre-provided with a unique address signal. Further, the disk 9 is moved by a motor 11, for example.
Rotates at a constant speed such as 800 rpm.
１３は移送モータであり、移送軸１２によってディスク
９をトラックの径方向へ移動させる。１４はプリアンプ
であり、光電変換器８によって電気信号に変換した再生
信号を増幅し出力端子Ｂより出力として出す。又プリア
ンプ１４の出力信号は制御回路１５に加えられ、この制
御回路１５の出力が、トラッキング制御信号としてトラ
ッキングミラー５に、又、フォーカス制御信号としてボ
イスコイル１６に加えられ、フォーカス、ドラッギング
を行う。さらに、第２図は第１図の半導体レーザ駆動回
路１の構成を示したもので、１７はディスクから信号を
再生する時に半導体レーザ２に流す電流を決める再生パ
ワー設定回路、１８はディスクに信号を記録する時に半
導体レーザ２に流す電流を決める記録パワー設定回路で
ある。信号を記録する際には、ゲート回路２１が閉じ、
加算器１９には再生パワー設定回路１７からの電位出力
■□と、記録パワー設定回路１８からの電位出力ｖｗが
入力として加えられる。又端子人からは記録すべき情報
信号、たとえばｌ １１Ｉ 、 ｎ Ｑ １１のディジ
タル信号が加えられ、ゲート回路２２において、情報信
号が１″の時は、端子ａにスイッチが倒れ、加算器１９
からの出力ｖＲ＋ｖｗを選択する。”○“の時は端子す
にスイッチが倒れ電位はここではＯを選択する。そして
、端子Ｃからの入力電位に応じて電流供給回路２ｏから
半導体レーザ２に駆動電流を供給する。すなわち半導体
レーザ２の出力パワーは第３図に示すように記録信号“
１′の時、駆動電圧ｖＲ＋ｖｗに応じたＰｗ となり、
”０゛の時はＰｏ（−〇）となる。 信号を再生する際
は、ゲート回路２１が開いており加算器１９へは再生パ
ワー設定回路１７の電位出力ｖＲだけが加えられ、又、
ゲート回路２２のスイッチは端子ａに倒れており、電流
供給回路２０では、入力電圧ｖＲに応じた駆動電流を半
導体レーザ２に供給する。すなわち、再生時には第３図
に示すように半導体レーザ２の出力パワーは、ＰＲとな
る。A transfer motor 13 moves the disk 9 in the radial direction of the track by the transfer shaft 12. 14 is a preamplifier, which amplifies the reproduction signal converted into an electric signal by the photoelectric converter 8 and outputs it from the output terminal B. Further, the output signal of the preamplifier 14 is applied to a control circuit 15, and the output of this control circuit 15 is applied to the tracking mirror 5 as a tracking control signal and to the voice coil 16 as a focus control signal to perform focusing and dragging. Further, FIG. 2 shows the configuration of the semiconductor laser drive circuit 1 shown in FIG. 1, where 17 is a reproduction power setting circuit that determines the current to be passed through the semiconductor laser 2 when reproducing a signal from the disk, and 18 is a reproduction power setting circuit for determining the current flowing through the semiconductor laser 2 when reproducing a signal from the disk. This is a recording power setting circuit that determines the current flowing through the semiconductor laser 2 when recording. When recording a signal, the gate circuit 21 is closed,
The potential output ■□ from the reproduction power setting circuit 17 and the potential output vw from the recording power setting circuit 18 are added to the adder 19 as inputs. Further, information signals to be recorded, such as digital signals l 11I and n Q 11, are added from the terminals, and in the gate circuit 22, when the information signals are 1'', a switch is turned over to the terminal a, and the adder 19
Select the output vR+vw from . When it is "○", the switch collapses on the terminal, and the potential is selected as O here. Then, a drive current is supplied to the semiconductor laser 2 from the current supply circuit 2o in accordance with the input potential from the terminal C. In other words, the output power of the semiconductor laser 2 is equal to the recording signal "
When 1', Pw corresponds to the drive voltage vR + vw,
When the signal is 0, it becomes Po (-〇). When reproducing the signal, the gate circuit 21 is open and only the potential output vR of the reproduction power setting circuit 17 is applied to the adder 19, and
The switch of the gate circuit 22 is turned to the terminal a, and the current supply circuit 20 supplies the semiconductor laser 2 with a drive current according to the input voltage vR. That is, during reproduction, the output power of the semiconductor laser 2 becomes PR as shown in FIG.
通常は常時、半導体レーザ２からパワーＰＲの再生ビー
ム光を放出し、一般的に知られているフォーカス、トラ
ッキング制御を行っており、記録信号が入力されると半
導体レーザの出力を再生時より高レベルのＰｗに切換え
て記録ビーム光とし、光学ヘッド部Ｃで１μｍ程度の微
小光に絞り、ディスク９に照射し、記録を行う。以上に
述べた様な従来例ではディスクに記録も再生もしない、
いわゆるアイドル状態の時にも半導体レーザから常・・
：時再生パワーが放出されており、このような長時間の
パワーの放出は半導体レーザの寿命を縮める原因となる
。さらに長時間、ディスクに再生光が照射されているた
め、ディスクに雑音を記録してし捷うという問題点があ
った。Normally, the semiconductor laser 2 always emits a power PR reproduction beam light and performs generally known focus and tracking control, and when a recording signal is input, the output of the semiconductor laser is set to a higher level than during reproduction. The level Pw is switched to a recording beam light, and the optical head C narrows down the light to a minute light of about 1 μm, and irradiates the disc 9 with it to perform recording. In the conventional example described above, neither recording nor playback is performed on the disk.
Even in the so-called idle state, the semiconductor laser constantly...
: Regeneration power is emitted at the time, and emitting power for such a long time will shorten the life of the semiconductor laser. Furthermore, since the reproduction light is irradiated onto the disk for a long time, there is a problem in that noise is recorded on the disk and the disk is unused.
発明の目的
本発明は以上のような問題を解決すべくなされたもので
、ディスクに雑音が記録されるのを防ぎ、さらに半導体
レーザの寿命を伸ばし、ライフの長い光学的記録再生装
置を提供することを目的とする。Purpose of the Invention The present invention was made to solve the above-mentioned problems, and provides an optical recording/reproducing device with a long life by preventing noise from being recorded on a disk and extending the life of a semiconductor laser. The purpose is to
発明の構成
本発明は、記録時、再生時、及び記録も再生もしないア
イドル時によって半導体レーザーのパワーのレベルを３
段階に切換えて出力し、記録時には最も高レベルのパワ
ー出力とし、再生時には記録時よりも低レベルのパワー
出力とし、さらにアイドル時には最も低いレベルのパワ
ーを半導体レーザーに出力させるように構成したもので
ある。Structure of the Invention The present invention adjusts the power level of a semiconductor laser into three levels during recording, reproduction, and idle time when neither recording nor reproduction is performed.
It is configured so that the output is switched in stages, the highest level of power is output during recording, the power is output at a lower level than during recording during playback, and the lowest level of power is output to the semiconductor laser when idle. be.
実施例の説明
以下、本発明の一実施例について図面に従って説明する
。第４図は本発明に係る光学的記録装置の主に半導体レ
ーザ駆動部をブロック図に示したもので、第１図の従来
例の構成図において半導体レーザ駆動回路１に相当し、
第２図と同様なものには同じ番号を付しである。又、第
６図は本実施例の記録再生時のパワー変化を示した図で
ある。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 4 is a block diagram showing mainly the semiconductor laser driving section of the optical recording apparatus according to the present invention, which corresponds to the semiconductor laser driving circuit 1 in the configuration diagram of the conventional example shown in FIG.
Components similar to those in FIG. 2 are given the same numbers. Further, FIG. 6 is a diagram showing power changes during recording and reproduction in this embodiment.
１８は記録時に半導体レーザ２に流す電流を決める記録
パワー設定回路、１７は再生時に半導体レーザ２に流す
電流を決める再生パワー設定回路、２３は記録も再生も
しないアイドル時に半導体レーザ２に流す電流を決める
アイドル時パワー設定回路である。２４はディスクより
信号を読み取る再生時に、２１はディスクに信号を書き
込む記録時にそれぞれ閉じるゲート回路、１９は半導体
レーザに供給されるパワーを加算する加算器、２゜は加
算器１９の出力信号に応じた駆動電流を半導体レーザ２
に供給する電流供給回路である。又、２２は端子人から
加えられたディスクに記録する情報信号、例えばディジ
タル信号ならば°＋ １＋＋。Reference numeral 18 indicates a recording power setting circuit that determines the current flowing through the semiconductor laser 2 during recording, 17 indicates a reproduction power setting circuit that determines the current flowing through the semiconductor laser 2 during reproduction, and 23 indicates a current flowing through the semiconductor laser 2 during idle time when neither recording nor reproduction is performed. This is the idle power setting circuit. 24 is a gate circuit that is closed during playback to read a signal from the disk, 21 is a gate circuit that is closed during recording to write a signal to the disk, 19 is an adder that adds the power supplied to the semiconductor laser, and 2° is a gate circuit that is closed in response to the output signal of the adder 19. The drive current is transferred to the semiconductor laser 2.
This is a current supply circuit that supplies current to the Also, 22 is an information signal to be recorded on the disk added from the terminal, for example, °+1++ if it is a digital signal.
０゛により、高速にスイッチングされるゲート回路であ
る。本実施例の実際の動作１でついて説明すると、捷ず
、信号を記録も再生もしないアイドル時には、ゲート回
路２１．２４は開いており、又ゲート回路２２のスイッ
チは端子ａ側に倒れ、半導体レーザ２にはアイドル時パ
ワー回定回路２３からの出力■、の電位に応じた電流が
供給され、半導体レーザ２の出力パワーは第５図に示す
ようにＰ工となっている。このパワーＰｉは、トラッキ
ングがかかる程度のレベルでアイドル時にもトラッキン
グを行っている。信号再生時にはゲート回路２４が閉じ
、ゲート回路２１は開いている。It is a gate circuit that switches at high speed due to 0゛. To explain the actual operation 1 of this embodiment, during idle time when no signal is recorded or reproduced, the gate circuits 21 and 24 are open, and the switch of the gate circuit 22 is turned to the terminal a side, and the semiconductor The laser 2 is supplied with a current corresponding to the potential of the output (2) from the idle power rotation circuit 23, and the output power of the semiconductor laser 2 is P as shown in FIG. This power Pi is at such a level that tracking is performed even when the vehicle is idle. During signal reproduction, the gate circuit 24 is closed and the gate circuit 21 is open.
この時の加算器１９の出力はＶ工＋ｖＲであり、又、ゲ
−１・回路２２のスイッチは端子ａ側に倒れており、半
導体レーザ２にはｖｉ＋ｖＲの電位に対応した電流が電
流供給回路２０から供給され、半導体レーザ２から放射
される再生パワーは第５図だ示すようにＰＲとなる。次
に信号記録時にはゲート回路２１．２４が閉じ、加算器
１９の出力はＶ工＋ｖＲ＋ｖｗとなり、端子Ａから加え
られた記録信号′、の強弱、例えばディジタル信号の“
１１Ｉ 、 ｎ ｏ ＩＩの２値によって、ゲート回路
２２のスイッチは、”１″の時端子ａ側に、” ｏ ”
の時、端子す側に倒れ、電流供給回路２０には記録信号
が°゛１′′の時はＶ工＋ｖＲ＋ｖｗが、”０゛′の時
は０が入力電位として加えられ、半導体レーザ２の記録
ノ（ワー出力は第５図に示すように、＝゛１−１の時は
Ｐｗ、０゛′の時Ｐ０（−〇）となる。At this time, the output of the adder 19 is V+vR, and the switch of the gate 1/circuit 22 is turned to the terminal a side, and the semiconductor laser 2 is supplied with a current corresponding to the potential of vi+vR through the current supply circuit. The reproducing power supplied from the semiconductor laser 20 and emitted from the semiconductor laser 2 becomes PR as shown in FIG. Next, when recording a signal, the gate circuits 21 and 24 are closed, and the output of the adder 19 becomes V+vR+vw.
11I, no II, the switch of the gate circuit 22 is "1", when the switch is "1", the terminal a side is "o"
When the recording signal is ``1'', V + vR + vw is applied to the current supply circuit 20, and when it is ``0'', 0 is applied as the input potential, and the semiconductor laser 2 As shown in FIG. 5, the recording output is Pw when =1-1, and P0 (-0) when 0'.
このように本発明では信号を記録も再生もしないアイド
ル時には半導体レーザの出力光を記録再生時より低いレ
ベルに保ち、半導体レーザ駆動のエネルギーの無駄を無
くしている。又、この実施例では、特許請求の範囲第２
項に示したようにアイドル時に充分、低いパワーでフォ
ーカス、トラッキングを行うように構成しているがアイ
ドル時に半導体レーザの出力パワーを０に設定して、先
に述べたような従来例の問題点を解決することも当然考
えられる。As described above, in the present invention, the output light of the semiconductor laser is kept at a lower level during idle time when neither recording nor reproduction of signals is performed than during recording and reproduction, thereby eliminating waste of energy in driving the semiconductor laser. In addition, in this embodiment, the second claim
As shown in the section above, the configuration is configured to perform focusing and tracking with sufficient low power during idle, but the output power of the semiconductor laser is set to 0 during idle, which causes the problems of the conventional example described earlier. Of course, it is possible to solve this problem.
発明の効果
以上詳述したように、本発明において、アイドル時の半
導体レーザ出カッ切−を記録再生時より１゜
も低いレベルに設定することにより、半導体レーザ駆動
エネルギーの無駄を省き 光デイスク装置の寿命ともい
える半導体レーザの寿命を伸ばし、ライフの長い記録再
生装置を提供することができる。さらに、アイドル時に
ディスクに余分な雑音を記録してしまうという欠点を防
ぐことができる。Effects of the Invention As detailed above, in the present invention, by setting the semiconductor laser output cut-off during idle to a level 1° lower than that during recording and reproduction, waste of semiconductor laser driving energy can be avoided. It is possible to extend the life of the semiconductor laser, which can be said to be the life of the semiconductor laser, and provide a recording/reproducing device with a long life. Furthermore, the disadvantage of recording extra noise on the disk when idle can be avoided.
第１図は従来例の光学的記録再生装置の構成を示したブ
ロック図、第２図は従来例の半導体レーザ駆動回路部の
構成を示したブロック図、第３図は同従来例の各タイミ
ングにおける光・々ワーを示す波形図、第４図は本発明
の光学的記録再生装置の一実施例の要部ブロック図、第
６図は同実施例の各タイミングにおける光パワーを示す
波形図である。
２・・・・・・半導体レーザ、３，６．７・・・・・・
レンズ、４・・・・・・ビームスプリッタ、５°゛°°
°°トラツキングミラー、８・・・・・・光電変換器、
９・・・・・・ディスク、１゜１、・・・・案内トラッ
ク、１１・・・・・・モータ、１２・・・・・・移“＼
’ｌ’ｌｓ 軸、１３・・・・・移送モータ、１６・・
・・・・ボイスコイ１１
ル、２１，２２．２４・・・・・・ゲーＩ・回路。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名り【
ａ：ＩFig. 1 is a block diagram showing the configuration of a conventional optical recording/reproducing device, Fig. 2 is a block diagram showing the configuration of a semiconductor laser drive circuit section of the conventional example, and Fig. 3 is a block diagram showing the configuration of the conventional example. FIG. 4 is a block diagram of a main part of an embodiment of the optical recording/reproducing apparatus of the present invention, and FIG. 6 is a waveform diagram showing optical power at each timing of the embodiment. be. 2... Semiconductor laser, 3,6.7...
Lens, 4... Beam splitter, 5°゛°°
°°Tracking mirror, 8...Photoelectric converter,
9...disk, 1゜1,...guide track, 11...motor, 12...transfer axis, 13...・Transfer motor, 16...
...Voice Coil 11 Le, 21, 22.24...Ge I/Circuit. Name of agent: Patent attorney Toshio Nakao and one other person [
a:I
Claims (2)
光に絞って信号を記録又は再生する装置であり、記録も
再生もしないアイドル状態の時に、前記半導体レーザの
出力光のパワーを記録時及び再生時よりも低いレベルに
する手段を備えたことを特徴とする光学的記録再生装置
。(1) A device that records or reproduces signals on a photosensitive recording medium by concentrating the output light of a semiconductor laser or the like into minute light, and records the power of the output light of the semiconductor laser when it is in an idle state without recording or reproduction. 1. An optical recording and reproducing device characterized by comprising means for setting the level to a level lower than that at the time of reproduction.
レベルの半導体レーザの出力光がアイドル時に少なくと
もフォーカス及びトラッキング制御がかかる程度のパワ
ーを保つよう設定されていることを特徴とする特許請求
の範囲第１項記載の光学的記録再生装置。(2) The output light of the semiconductor laser in an idle state is set so that the output light of the semiconductor laser at a level lower than that during recording and reproduction is set to maintain at least a power level that requires focus and tracking control in the idle state. The optical recording/reproducing device according to item 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59096814A JPS60239929A (en) | 1984-05-15 | 1984-05-15 | Optical recording and reproducing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59096814A JPS60239929A (en) | 1984-05-15 | 1984-05-15 | Optical recording and reproducing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60239929A true JPS60239929A (en) | 1985-11-28 |
Family
ID=14175054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59096814A Pending JPS60239929A (en) | 1984-05-15 | 1984-05-15 | Optical recording and reproducing device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60239929A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62172536A (en) * | 1986-01-23 | 1987-07-29 | Ricoh Co Ltd | Optical information recording and reproducing method |
| EP0276326A1 (en) * | 1986-07-31 | 1988-08-03 | Sony Corporation | Optical disc recording/reproducing apparatus |
| JPH01144228A (en) * | 1987-11-30 | 1989-06-06 | Toshiba Corp | Information recorder |
| JPH01155521A (en) * | 1987-12-11 | 1989-06-19 | Nippon Telegr & Teleph Corp <Ntt> | Method for recording into optical disk |
| US4868804A (en) * | 1985-06-28 | 1989-09-19 | Alcatel Thomson Gigadisc | Optical memory system which uses a different illumination mode when scanning reserved areas |
| US4918681A (en) * | 1986-12-25 | 1990-04-17 | Kabushiki Kaisha Toshiba | Data reproducing apparatus using idling current |
| US4989198A (en) * | 1987-04-28 | 1991-01-29 | Sharp Kabushiki Kaisha | Beam control device utilizing beam having a specific direction of polarization to control a laser used in an optical memory system |
| US5010534A (en) * | 1984-12-29 | 1991-04-23 | Canon Kabushiki Kaisha | Optical information recording-reproducing apparatus |
| JPH04341929A (en) * | 1991-05-17 | 1992-11-27 | Matsushita Electric Ind Co Ltd | Optical disk device |
| EP2112657A1 (en) * | 2008-04-24 | 2009-10-28 | Harman Becker Automotive Systems GmbH | Lifetime improvement of laser diodes in optical drives |
-
1984
- 1984-05-15 JP JP59096814A patent/JPS60239929A/en active Pending
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5010534A (en) * | 1984-12-29 | 1991-04-23 | Canon Kabushiki Kaisha | Optical information recording-reproducing apparatus |
| US4868804A (en) * | 1985-06-28 | 1989-09-19 | Alcatel Thomson Gigadisc | Optical memory system which uses a different illumination mode when scanning reserved areas |
| JPS62172536A (en) * | 1986-01-23 | 1987-07-29 | Ricoh Co Ltd | Optical information recording and reproducing method |
| US5042022A (en) * | 1986-07-31 | 1991-08-20 | Sony Corporation | Optical disk recording/reproducing apparatus with synchronized data writing |
| EP0276326A1 (en) * | 1986-07-31 | 1988-08-03 | Sony Corporation | Optical disc recording/reproducing apparatus |
| US4918681A (en) * | 1986-12-25 | 1990-04-17 | Kabushiki Kaisha Toshiba | Data reproducing apparatus using idling current |
| US4989198A (en) * | 1987-04-28 | 1991-01-29 | Sharp Kabushiki Kaisha | Beam control device utilizing beam having a specific direction of polarization to control a laser used in an optical memory system |
| JPH01144228A (en) * | 1987-11-30 | 1989-06-06 | Toshiba Corp | Information recorder |
| JPH01155521A (en) * | 1987-12-11 | 1989-06-19 | Nippon Telegr & Teleph Corp <Ntt> | Method for recording into optical disk |
| JPH04341929A (en) * | 1991-05-17 | 1992-11-27 | Matsushita Electric Ind Co Ltd | Optical disk device |
| EP2112657A1 (en) * | 2008-04-24 | 2009-10-28 | Harman Becker Automotive Systems GmbH | Lifetime improvement of laser diodes in optical drives |
| WO2009129921A1 (en) * | 2008-04-24 | 2009-10-29 | Harman Becker Automotive | Lifetime improvement of laser diodes in optical drives |
| US20110096646A1 (en) * | 2008-04-24 | 2011-04-28 | Richard Rutschmann | Reproducing System for Use With Optical Devices |
| US8223616B2 (en) | 2008-04-24 | 2012-07-17 | Harman Becker Automotive Systems Gmbh | Reproducing system for use with optical devices |
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