JPH0727638B2 - Optical information recording / reproducing method - Google Patents
Optical information recording / reproducing methodInfo
- Publication number
- JPH0727638B2 JPH0727638B2 JP60084111A JP8411185A JPH0727638B2 JP H0727638 B2 JPH0727638 B2 JP H0727638B2 JP 60084111 A JP60084111 A JP 60084111A JP 8411185 A JP8411185 A JP 8411185A JP H0727638 B2 JPH0727638 B2 JP H0727638B2
- Authority
- JP
- Japan
- Prior art keywords
- recording
- light beam
- information
- optical
- intensity
- 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.)
- Expired - Fee Related
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- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
Description
【発明の詳細な説明】 〔技術分野〕 本発明は光学的情報記録再生方法に関し、特にカード状
の光学的情報記録媒体を用いる方法に関する。本発明に
おいて光学的情報記録再生方法とは、前記の如き媒体に
情報を記録する方法、媒体に記録された情報を再生する
方法および記録と再生とを両方共行なう方法を示す。TECHNICAL FIELD The present invention relates to an optical information recording / reproducing method, and more particularly to a method using a card-shaped optical information recording medium. In the present invention, the optical information recording / reproducing method refers to a method of recording information on the medium as described above, a method of reproducing information recorded on the medium, and a method of performing both recording and reproduction.
従来、光を用いて情報を記録し、また記録された情報を
読出す媒体の形態としてデイスク状、カード状、テープ
状等各種のものが知られている。これらの内、カード状
に形成された光学的記録媒体（以下光カードと称す）
は、小型・軽量で持ち運びに便利な大記憶容量の媒体と
して、大きな需要が見込まれている。2. Description of the Related Art Conventionally, various types of media, such as a disc, a card, and a tape, are known as a form of a medium for recording information using light and reading the recorded information. Of these, an optical recording medium formed into a card (hereinafter referred to as an optical card)
Is expected to be in great demand as a medium with a large storage capacity that is small, lightweight and convenient to carry.
上記の光カードは、記録情報に従つて変調され、微小ス
ポツトに絞つた光ビームで、カード上に予め設定された
記録トラツクを走査することによつて、光学的に検出可
能な記録ピツト列として情報が記録される。この際、記
録ピツト列の交叉等のトラブルを生ずる事なく、正確に
情報を記録していく為には、前記光ビームの照射位置を
走査方向と垂直な方向で制御（オートトラツキング、以
下ATと称す）する必要があつた。また、光ビームをカー
ド上に正確に合焦させる為、焦点制御（オートフオーカ
シング、以下AFと称す）も行なわれた。従つて、前記記
録トラツクからトラツキング信号、フオーカシング信号
を得る為に、前記変調された光ビームは、最小のレベル
においてもカード上で書き込みが行なわれない程度の所
定のパワーを有するように設定されていた。また、記録
された情報を再生する場合には、光カードに情報が書き
込まれないレベルの一定パワーの光ビームで、前述の記
録ピツト列を走査することによつて行なつていた。The above-mentioned optical card is an optically detectable recording pit sequence that is modulated according to the recording information and is scanned by a recording track preset on the card with a light beam focused on minute spots. Information is recorded. At this time, in order to accurately record information without causing trouble such as crossing of recording pit rows, the irradiation position of the light beam is controlled in a direction perpendicular to the scanning direction (auto tracking, hereinafter referred to as AT Need to). In addition, focus control (autofocusing, hereinafter referred to as AF) was also performed in order to accurately focus the light beam on the card. Therefore, in order to obtain the tracking signal and the focusing signal from the recording track, the modulated light beam is set to have a predetermined power such that writing is not performed on the card even at the minimum level. It was Further, when the recorded information is reproduced, the above-mentioned recording pit row is scanned with a light beam having a constant power level at which the information is not written on the optical card.
一方、上記の如き光カードの情報再生手段は、記録又は
再生の動作時に光カードと光ビームとを相対的に移動さ
せることにより、光ビームの走査を行なつていた。ま
た、光カード上の記録トラツクは複数本の直線状に設け
られている為、上記走査は間欠的に行なわれ、非動作時
には光ビームを静止状態で待機させていた。On the other hand, the information reproducing means of the optical card as described above scans the optical beam by relatively moving the optical card and the optical beam during the recording or reproducing operation. Further, since the recording tracks on the optical card are provided in a plurality of straight lines, the above scanning is performed intermittently, and the light beam is made to stand by in a stationary state when not in operation.
ところが、このような従来の装置において、光ビームの
静止状態が長時間続くと、前述のような書き込みが行な
われないレベルの光ビームにおいても、エネルギーの蓄
積によつて誤信号が書き込まれてしまう場合があつた。
このような誤信号はやはり光ビームによつて検出され、
トラツクアクセスなどの際に大きな支障となつた。However, in such a conventional device, if the stationary state of the light beam continues for a long time, an erroneous signal is written due to energy accumulation even in the light beam at a level where writing as described above is not performed. There were cases.
Such false signals are still detected by the light beam,
This was a major obstacle when accessing the track.
本発明の目的は、かかる従来装置の欠点を解決し、光ビ
ームの静止時の誤記録および記録媒体の劣化を防ぐと共
に非動作時からスムーズに記録又は再生動作への復帰が
可能な光学的情報記録再生方法を提供することにある。An object of the present invention is to solve the drawbacks of the conventional device, prevent erroneous recording when the light beam is stationary, and prevent deterioration of the recording medium, and also provide optical information capable of smoothly returning to recording or reproducing operation when not operating. It is to provide a recording and reproducing method.
本発明の上記目的は、光学的情報記録媒体上に設けられ
た複数トラックの内の所望のトラックに対して、情報の
記録と再生とで強度の異なる光ビームを照射すると共に
前記光ビームを前記トラックに対してトラッキング制御
しながら情報の記録又は再生を行う光学的情報記録再生
方法において、前記光ビームと前記媒体とを相対的に往
復運動させながら情報の記録を行う動作段階と、前記往
復運動を停止させ、前記光ビームと前記媒体とを静止状
態で待機させる、情報の記録又は再生を行わない非動作
段階と、前記非動作段階時において、前記記録媒体上に
照射される光ビームの強度を前記トラッキング制御可能
で且つ前記記録時及び再生時の強度より低い強度に低下
させる段階とを有することによって達成される。The above-mentioned object of the present invention is to irradiate a desired track among a plurality of tracks provided on an optical information recording medium with a light beam having different intensities for recording and reproducing of information, and at the same time, to emit the light beam. In an optical information recording / reproducing method for recording or reproducing information while performing tracking control on a track, an operation step of recording information while relatively reciprocating the light beam and the medium, and the reciprocating motion. Stop and stop the light beam and the medium in a stationary state, a non-operation stage in which information is not recorded or reproduced, and the intensity of the light beam irradiated on the recording medium in the non-operation stage. Is controllable by the tracking and is reduced to a strength lower than the strength during recording and reproduction.
以下、図面を用いて本発明の実施例を詳細に説明する。 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
第２図は、本発明の情報記録再生方法に用いる光カード
の一例を示す概略平面図である。図中、１は光カード、
２は光カード上に複数本の直線状に形成された記録トラ
ック、３は所定速度で光ビームが走査される記録トラッ
クのデータ記録エリア、41,42は所望トラツクの検索が
なされるトラツク選択エリア、５は光ビームのホームポ
ジシヨンである。光ビームは最初ホームポジシヨン５に
静止している。記録又は再生の際には、まず光ビームは
トラツク選択エリア41をａ方向に移動し、記録又は再生
しようとするＮ番目のトラツク２を見つける。そして、
光ビームはトラツク２上のデータ記録エリア３を矢印Ｃ
方向に走査し、記録又は再生を行なう。記録又は再生が
終了すると、光ビームはトラツク選択エリア42内で停止
し、次に記録又は再生を行なうまでの間、静止状態で待
機される。記録又は再生の指令がくると、この光ビーム
は、次に記録又は再生すべきトラツク（例えばＮ＋１番
目のトラツク）に選択エリア42内を矢印ａ方向に移動
し、このトラツクのデータ記録エリア３を矢印ｂ方向に
走査し、同様に記録又は再生が行なわれる。そして、こ
の動作を繰り返すことによつて、所定量のデータが記録
又は再生される。FIG. 2 is a schematic plan view showing an example of an optical card used in the information recording / reproducing method of the present invention. In the figure, 1 is an optical card,
Reference numeral 2 is a recording track formed in a plurality of linear shapes on an optical card, 3 is a data recording area of a recording track where a light beam is scanned at a predetermined speed, and 4 1 and 4 2 are tracks for searching for a desired track. The selection areas 5 are the home positions of the light beams. The light beam is initially stationary at home position 5. During recording or playback, the first light beam moves the track selection areas 4 1 in a direction to find the N-th track 2 to be recorded or reproduced. And
The light beam moves through the data recording area 3 on the track 2 by the arrow C.
Scan in the direction to record or reproduce. When recording or reproducing is completed, the light beam is stopped in track selection area 4 within 2, then until performing recording or reproduction, is awaited at rest. When a command for recording or reproduction comes, this light beam is then recorded or to move the selection area 4 in 2 in the direction of arrow a to be reproduced tracks (e.g. N + 1 th track), the data recording area 3 of the track Is scanned in the direction of arrow b, and recording or reproduction is similarly performed. Then, by repeating this operation, a predetermined amount of data is recorded or reproduced.
第３図は、記録及び再生時の光ビームの光カード上での
パワーを説明する図で、夫々（Ａ）は記録時、（Ｂ）は
再生時である。また、図の横軸はトラツク上の位置、縦
軸は光パワーＰを示す。記録時に光ビームは（Ａ）のよ
うにデータ記録エリアに対応する走査範囲EWにおいて、
記録ピツトが形成されず、またトラツクキング信号及び
フオーカシング信号を得る為に必要な最小限のパワーP
WLで常に光カードに照射される。そして、記録信号に応
じて、記録に必要なだけのパワーPWHとの間で変調さ
れ、パワーPWHで照射された部分にのみ記録ピツトが形
成される。また、再生時にも走査範囲ERにおいて記録ピ
ツトが形成されない一定パワーPRで光ビームが照射さ
れ、前述の記録ピツトが読み取られる。FIG. 3 is a diagram for explaining the power of the light beam on the optical card during recording and reproduction, (A) during recording and (B) during reproduction, respectively. Further, the horizontal axis of the figure shows the position on the track, and the vertical axis shows the optical power P. At the time of recording, the light beam is in the scanning range E W corresponding to the data recording area as shown in (A),
The recording pit is not formed and the minimum power P required to obtain the tracking signal and the focusing signal.
The optical card is always illuminated by WL . Then, according to the recording signal, it is modulated with the power P WH required for recording, and the recording pit is formed only on the portion irradiated with the power P WH . Further, during reproduction, the light beam is emitted at a constant power P R where the recording pits are not formed in the scanning range E R , and the above-mentioned recording pits are read.
ここで、通常光カードの記録感度Ｓは、光ビームの照射
パワーＰと照射時間Ｔで決定される。従つて、第４図の
ように光ビームのスポツトが62から61へ相対速度Ｖで走
査される場合、スポツト径をφとすると、Ｖがφ/T以上
であれば記録されない。ところが、前述のように光ビー
ムが静止状態で待機している場合、この状態が長時間続
くと、たとえ光パワーが上記の如くRWL或いはPRであつ
ても誤記録されてしまう。本発明においては、このよう
な記録、再生の非動作時に、媒体上の光ビームの強度を
低下させるものである。Here, the recording sensitivity S of the normal optical card is determined by the irradiation power P of the light beam and the irradiation time T. Therefore, when the spot of the light beam is scanned from 6 2 to 6 1 at the relative velocity V as shown in FIG. 4, if the spot diameter is φ, V is φ / T or more and recording is not performed. However, as described above, when the light beam is standing by in a stationary state, if this state continues for a long time, even if the optical power is R WL or P R as described above, it is erroneously recorded. In the present invention, the intensity of the light beam on the medium is reduced during such non-recording and reproducing operations.
第１図は、本発明の光学的情報記録再生方法を行う装置
の一実施例を示す概略図である。ここで、１は第２図の
如き光カードで、ベルト20に固定された載置台17上に載
置されている。ベルト24はプーリ19,18にかけわたさ
れ、モータ21によつて矢印ｄ方向に移動し、これに伴つ
て、光カード１もｄ方向に移動する。従つて、光カード
１面においては、光ヘツド16から照射される光ビーム32
は第２図のｂ或いはｃ方向に走査される。光ヘツド16
は、半導体レーザ11、コリメータレンズ12、ビームスプ
リツタ13、対物レンズ14及び光検出器15とから構成され
る。前記の光ビーム32は半導体レーザ11から射出し、対
物レンズ14で光カード１上に微小スポツトとして集光さ
れる。また、この光ビーム32の光カードによる反射光
は、再び対物レンズ14を通り、ビームスプリツタ13で入
射光と分離されて光検出器15で検出される。この光検出
器15で検出された信号は、信号復調回路22、トラツキン
グ制御回路23、フォーカス制御回路24に送られ、フオー
カス制御回路24及びトラツキング制御回路23は、対物レ
ンズ14を夫々光軸方向及び光軸と垂直な方向に動かし、
AFとATとを行なう。FIG. 1 is a schematic view showing an embodiment of an apparatus for carrying out the optical information recording / reproducing method of the present invention. Here, 1 is an optical card as shown in FIG. 2, which is mounted on a mounting table 17 fixed to a belt 20. The belt 24 is stretched over the pulleys 19 and 18, and is moved by the motor 21 in the direction of arrow d. Accordingly, the optical card 1 is also moved in the direction of d. Therefore, on the surface of the optical card 1, the light beam 32 emitted from the optical head 16 is emitted.
Is scanned in the b or c direction of FIG. Light head 16
Is composed of a semiconductor laser 11, a collimator lens 12, a beam splitter 13, an objective lens 14, and a photodetector 15. The light beam 32 is emitted from the semiconductor laser 11 and is converged as a minute spot on the optical card 1 by the objective lens 14. The reflected light of the light beam 32 from the optical card passes through the objective lens 14 again, is separated from the incident light by the beam splitter 13, and is detected by the photodetector 15. The signal detected by the photodetector 15 is sent to the signal demodulation circuit 22, the tracking control circuit 23, and the focus control circuit 24, and the focus control circuit 24 and the tracking control circuit 23 cause the objective lens 14 to move in the optical axis direction, respectively. Move it in the direction perpendicular to the optical axis,
Perform AF and AT.
28はステツピングモータで、光ヘツド16を紙面垂直方向
に動かし、これによつて第２図ａ方向に光ビームの照射
位置を移動させる。前記モータ21は、モータ駆動回路25
によつて制御され、光カードの移動、停止を行なう。ま
たモータ21の駆動速度は、速度検知回路29によつて検知
され、この速度検知回路29は時間計測回路30を介して、
半導体レーザ11を駆動するレーザ駆動回路31に接続され
ている。更に、信号復調回路22、ステツピングモータ2
8、モータ駆動回路25、レーザ駆動回路31は夫々インタ
ーフエイス26を介して、中央処理装置（CPU）27に接続
されている。Reference numeral 28 denotes a stepping motor which moves the optical head 16 in the direction perpendicular to the plane of the drawing, thereby moving the irradiation position of the light beam in the direction of FIG. The motor 21 includes a motor drive circuit 25.
The optical card is moved and stopped. Further, the drive speed of the motor 21 is detected by a speed detection circuit 29, and this speed detection circuit 29, via a time measurement circuit 30,
It is connected to a laser drive circuit 31 that drives the semiconductor laser 11. Furthermore, the signal demodulation circuit 22, the stepping motor 2
8. The motor drive circuit 25 and the laser drive circuit 31 are connected to a central processing unit (CPU) 27 via an interface 26, respectively.
この装置において、記録又は再生の動作を行なう場合に
は、CPU27の制御によつて、モータ21およびステツピン
グモータ28が駆動され、第２図で説明したように光ビー
ムがデータ記録エリア３を走査する。このとき半導体レ
ーザ11からの光ビーム32は、光カード上で常に第３図P
WL或いはPRのパワーを有し、記録時には更に端子C1から
入力する記録信号に従つてパワーPWHとの間で変調がな
される。また、再生時には端子C2から再生信号が出力さ
れる。In this apparatus, when recording or reproducing operation is performed, the motor 21 and the stepping motor 28 are driven by the control of the CPU 27, and the light beam scans the data recording area 3 as described with reference to FIG. To do. At this time, the light beam 32 from the semiconductor laser 11 is always shown on the optical card in FIG.
It has a power of WL or P R , and at the time of recording, it is further modulated with the power P WH according to the recording signal input from the terminal C 1 . Also, during reproduction, a reproduction signal is output from the terminal C 2 .
次に、第１図の装置の記録時における動作を第５図で説
明する。第５図（Ａ）は前述の光カード１の記録面の拡
大図である。データ記録エリア３の記録トラツク2N,2
N+1,…の間には、トラツキング信号を検出する為のトラ
ツキングトラツク８と、クロツク信号を得る為のクロツ
クトラツク７が交互に形成されている。また、トラツク
選択エリア41には、非動作時に光ビームがトラツクから
はずれないようにトラツキングする為の補助トラツク９
が形成されている。また、（Ｂ）は光カード上の相対位
置に対する光ビームと記録面との相対速度Ｖの関係を示
し、（Ｃ）は光カード上の相対位置に対する記録ビーム
の強度Ｐの関係を示す。Next, the operation of the apparatus shown in FIG. 1 during recording will be described with reference to FIG. FIG. 5A is an enlarged view of the recording surface of the optical card 1 described above. Recording track 2 N , 2 in data recording area 3
A tracking track 8 for detecting a tracking signal and a clock track 7 for obtaining a clock signal are alternately formed between N + 1 , .... In addition, the track selection area 4 1, for the light beam at the time of non-operation is tracking so as not to deviate from the track auxiliary track 9
Are formed. Further, (B) shows the relationship between the relative speed V of the light beam and the recording surface with respect to the relative position on the optical card, and (C) shows the relationship of the intensity P of the recording beam with respect to the relative position on the optical card.
第１図の装置において、光ビーム32は実際には不図示の
回折格子等により３つのビームに分割され、各々のビー
ムによるスポツトは第５図（Ａ）のS1a,S2a,S3a或いはS
1b,S2b,S3b或いはS1c,S2c,S3cのように光カード１上に
照射される。尚、第５図（Ａ）では便宜上光ビームの強
度をスポツトの径で表現している。情報の記録時には、
光ビームは（Ｂ）のように記録面と一定の速度VWで走査
され、記録ビーム（中央のスポツト）で記録がなされ
る。このとき、両端のスポツトから夫々トラツキング信
号及びクロツク信号を検出する。記録ビームの光カード
上の強度は（Ｃ）のようにPWH及びPWLの間で情報に従つ
て変調されている。即ちスポツトS2a,S2bは夫々PWH,PWL
の強度に設定される。また、クロツク信号、トラツキン
グ信号を得る為のスポツトは、信号を得るのに十分で、
且つ、記録がなされないように、中央のスポツトよりも
強度が低く設定されている。In the apparatus of FIG. 1, the light beam 32 is actually divided into three beams by a diffraction grating or the like (not shown), and the spots due to each beam are S 1 a, S 2 a, S of FIG. 5 (A). 3 a or S
The optical card 1 is irradiated with 1 b, S 2 b, S 3 b or S 1 c, S 2 c, S 3 c. In FIG. 5 (A), the intensity of the light beam is represented by the diameter of the spot for convenience. When recording information,
The light beam is scanned with the recording surface at a constant velocity V W as shown in (B), and recording is performed with the recording beam (center spot). At this time, the tracking signal and the clock signal are respectively detected from the spots at both ends. The intensity of the recording beam on the optical card is modulated between P WH and P WL according to the information as shown in (C). That is, spots S 2 a and S 2 b are P WH and P WL, respectively.
Is set to the strength of. Also, the spots for obtaining the clock signal and tracking signal are sufficient to obtain the signal,
Moreover, the strength is set lower than that of the center spot so that no recording is made.
記録が終了するとビームスポツトはトラツク選択エリア
41に入り、第５図（Ｂ）のように記録面との相対速度が
低下して、最終的にスポツトS1c,S2c,S3cの位置で静止
状態で待機する。この時、第１図の速度検知回路29は、
モータ21より光ビームと光カードとの相対速度Ｖが所定
の限界相対速度VLより遅くなつたことを検知し、時間計
測回路30を働かせる。ここで時間計測回路30には、所定
の時間Tc（例えば１秒）が設定されており、前記Ｖ＜VL
となつてからの時間ｔが、Tcと等しくなつたときには、
強度低下信号をレーザ駆動回路31に送り、半導体レーザ
11の注入電流を制御して、スポツトS2cの光カード上の
強度をPSに低下させる。そして、このスポツトS2cでト
ラツキング信号を検出し、補助トラツク９からスポツト
がはずれないように制御しながら、待機させる。そし
て、再び動作が開始されＶ＞VLとなつた場合には、速度
検知回路29によつてスポツトS2cの強度を元通りに強
め、記録を行なう。ここでスポツトS2cの強度PSは、ト
ラツキングをとるために最低限で、しかも、静止状態で
長時間記録面に照射されても記録が行なわれない強度に
設定する。もしｔ＜TCの間に、次の動作が開始され、Ｖ
＞VLとなれば、時間計測回路30はリセツトされる。前述
の光パワーPWLの静止光ビームで記録がなされる時間をT
SとするとTCはTC＜TSに設定される（例えばTC＝TS/
2）。また、この設定時間TCを光カードの記録感度に合
せて、外部の切り換えスイツチで段階的に、或いはボリ
ユーム等で連続的に変化可能に構成しても良い。尚、第
５図（Ｃ）では、Ｖ＜VLとなると同時に強度ＰがPSとな
るように描いているが、実際には前述の時間測定回路30
の働きによつて、一定時間経過後にPSとなる。When recording is completed, the beam spot will be in the track selection area.
4 enters the 1, the relative speed between the recording surface as in the fifth diagram (B) is lowered, eventually Supotsuto S 1 c, S 2 c, waits in a quiescent state at the location of the S 3 c. At this time, the speed detection circuit 29 of FIG.
The motor 21 detects that the relative speed V between the light beam and the optical card becomes slower than a predetermined limit relative speed VL , and the time measuring circuit 30 is activated. Here, a predetermined time Tc (for example, 1 second) is set in the time measuring circuit 30, and V <V L
When the time t from and becomes equal to Tc,
An intensity reduction signal is sent to the laser drive circuit 31, and the semiconductor laser
Control the injection current of 11 to reduce the intensity of spot S 2 c on the optical card to P S. Then, the Supotsuto S detects the tracking signals at 2 c, while controlling the Supotsuto from the auxiliary track 9 is not out, to wait. Then, when the operation has come is started V> V L again, strengthen the intensity of Yotsute Supotsuto S 2 c restored to the speed detection circuit 29 performs recording. Here, the intensity P S of the spot S 2 c is set to a minimum intensity for tracking, and is set to an intensity at which recording is not performed even when the recording surface is irradiated for a long time in a stationary state. If t <T C , the next operation is started and V
When> VL , the time measuring circuit 30 is reset. The time for recording with the stationary light beam of the above optical power P WL is T
Suppose T C is set to T C <T S (eg T C = T S /
2). Further, the set time T C may be configured to be changeable stepwise by an external switching switch or continuously by a volume or the like in accordance with the recording sensitivity of the optical card. In the FIG. 5 (C), but at the same time the intensity P becomes the V <V L is drawn so as to be P S, in fact the aforementioned time measuring circuit 30
By the action of, it becomes P S after a certain period of time.
以上の説明では、情報を記録する場合を示したが、光カ
ードに記録された情報を再生する場合に、第５図（Ｃ）
において、動作時の強度が一定値PRとなるだけで、記録
時と全く同様の動作が行なわれる。In the above description, the case of recording information is shown, but when reproducing the information recorded on the optical card, FIG.
In, the operation is exactly the same as that at the time of recording, except that the intensity at the time of operation becomes a constant value P R.
前述の実施例において、光ビームの強度の設定例を示す
と、例えば、ビームスポツト径が５μｍ、記録走査相対
速度VW＝50mm/S、再生走査相対速度VR＝500mm/Sであ
り、光ビームの強度Ｐと書き込み時間Ｔとの関係を、 Ｐ＝5mWの場合、TS＝100μＳ Ｐ＝1mWの場合、TS＝1S Ｐ＝0.2mWの場合、TS＝∞ とすれば、前述のスポツトS2a,S2bの強度を夫々PWH＝5m
W,PWL＝1mWとすれば良い。ここで中央のスポツトと両端
のスポツトとの強度比（回折格子を用いた場合には、比
は一定）を5:1とすると、スポツトS3a,S3bの強度は夫々
1mW及び0.2mWとなる。ここで0.2mWは、トラツキング信
号を得る為に十分な強度とする。1mWの光ビームの限界
相対速度VL＝φ/TS＝５μm/Sであるので、動作時にはVW
（或いはVR）＞VLとなつて、1mW以下の光ビームでは記
録はなされない。また、前述のTCを１秒とし、PSを0.2m
Wに設定すれば、補助トラツク９にスポツトS2cで記録が
なされる前に、このスポツトS2cの強度が0.2mWに低下
し、誤まつて書き込まれることがない。PR＝1mWとすれ
ば、再生時も全く同様である。In the above-described embodiment, an example of setting the intensity of the light beam is shown. For example, the beam spot diameter is 5 μm, the recording scanning relative velocity V W = 50 mm / S, the reproduction scanning relative velocity V R = 500 mm / S, and Assuming that the relationship between the beam intensity P and the writing time T is: P = 5 mW, T S = 100 μS P = 1 mW, T S = 1S P = 0.2 mW, T S = ∞ Strength of spots S 2 a and S 2 b is P WH = 5m
W, P WL = 1mW. Here, if the intensity ratio between the center spot and the spots at both ends (the ratio is constant when using a diffraction grating) is 5: 1, the strengths of the spots S 3 a and S 3 b are respectively
It becomes 1mW and 0.2mW. Here, 0.2 mW is set to an intensity sufficient to obtain a tracking signal. Limiting relative velocity of 1 mW light beam V L = φ / T S = 5 μm / S, so V W during operation
(Or V R )> V L, and recording is not performed with a light beam of 1 mW or less. Also, the above-mentioned T C is 1 second, and P S is 0.2 m.
If it is set to W, the strength of this spot S 2 c will drop to 0.2 mW before the spot S 2 c is recorded on the auxiliary track 9 and it will not be erroneously written. If P R = 1 mW, it is exactly the same during playback.
このように、本発明によれば光ビームが静止状態となる
非動作時には光ビームの強度を低下させるので、誤つて
記録が行なわれることがなく、また、強度を低下させた
状態でもトラツキング制御を行つている為、動作を再開
した時のアクセス時間を短縮出来る。As described above, according to the present invention, the intensity of the light beam is reduced during non-operation in which the light beam is in a stationary state, so that erroneous recording is not performed, and tracking control is performed even when the intensity is reduced. The access time when the operation is restarted can be shortened because the operation is performed.
本発明は、前述の実施例に限らず種々の変形が可能であ
る。例えば、実施例では光ビームの走査速度をモータか
ら直接検知したが、光カードの動作を制御するCPUから
の信号に従つて計時を開始するように構成しても良い。
また光検出器から読み出される信号によつて速度検知を
行なつてもかまわない。更に、時間計測回路を用いず
に、Ｖ＜VLとなると同時に光ビームの強度を低下させる
ように構成しても良い。The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the embodiment, the scanning speed of the light beam is directly detected from the motor, but the time may be started according to the signal from the CPU controlling the operation of the optical card.
Further, the speed may be detected by the signal read from the photodetector. Further, it may be configured to reduce the intensity of the light beam at the same time when V <V L without using the time measuring circuit.
また、トラツキング信号を得る為に最低限の強度の光ビ
ームであつても、長時間（例えば１時間）の静止状態で
記録がなされる場合には、非動作時に一旦光ビームの強
度を低下させ、更に１時間、次のアクセスが再開しなか
つたら、光ビームの照射を停止するようにしても良い。In addition, even if the light beam has the minimum intensity for obtaining the tracking signal, if the recording is performed in a stationary state for a long time (for example, one hour), the intensity of the light beam may be temporarily reduced during non-operation. The irradiation of the light beam may be stopped if the next access is not restarted for another hour.
本発明は、前述のような記録及び再生を行なう装置だけ
でなく、記録専用装置、再生専用装置にも適用が可能で
ある。The present invention can be applied not only to the recording and reproducing apparatus as described above, but also to a recording-only apparatus and a reproduction-only apparatus.
以上説明したように、本発明の光学的情報記録再生方法
は、記録又は再生の非動作時に光ビームの強度を低下さ
せる手段を設けたので、誤つて記録がなされないように
し、且つ、動作が再開されたときには、速やかにアクセ
スが行なえる効果を有する。また、非動作時の長時間に
亘る高出力な発光がなくなるので、半導体レーザ等の光
源の長寿命化、消費電力の省力化にもつながる。更に、
本発明は、事故等によつて光ビームの走査が停止してし
まつた時にも、誤記録を防ぐ効果を有する。As described above, since the optical information recording / reproducing method of the present invention is provided with the means for lowering the intensity of the light beam when the recording or reproducing is not in operation, the recording is prevented from being erroneously performed, and the operation is prevented. When it is restarted, it has the effect of allowing quick access. Further, since high-power light emission for a long period of time during non-operation is eliminated, the life of a light source such as a semiconductor laser is extended and power consumption is saved. Furthermore,
The present invention has an effect of preventing erroneous recording even when the scanning of the light beam is stopped due to an accident or the like.
第１図は本発明の光学的情報記録再生方法を行う光学的
情報記録再生装置の一実施例を示す概略構成図、第２図
は第１図示の装置に用いる光カードの一例を示す概略平
面図、第３図（Ａ），（Ｂ）は夫々記録時及び再生時の
光カード上の光パワーを説明する図、第４図は光カード
上で光ビームのスポツトが走査される様子を示す模式
図、第５図は第１図示の装置の動作を説明する図で、夫
々（Ａ）は光カードの記録面の平面図、（Ｂ）は光ビー
ムの位置と速度の関係を示す図、（Ｃ）は光ビームの位
置と強度との関係を示す図である。 １……光カード 11……半導体レーザ 21……モータ 29……速度検知回路 30……時間計測回路 31……レーザ駆動回路FIG. 1 is a schematic configuration diagram showing an embodiment of an optical information recording / reproducing apparatus for carrying out the optical information recording / reproducing method of the present invention, and FIG. 2 is a schematic plan view showing an example of an optical card used in the apparatus shown in FIG. FIGS. 3 (A) and 3 (B) are views for explaining the optical power on the optical card at the time of recording and reproducing, respectively, and FIG. 4 shows a state in which the spot of the light beam is scanned on the optical card. FIG. 5 is a schematic diagram for explaining the operation of the apparatus shown in FIG. 1, (A) is a plan view of the recording surface of the optical card, and (B) is a diagram showing the relationship between the position and speed of the light beam, FIG. 7C is a diagram showing the relationship between the position and intensity of the light beam. 1 …… Optical card 11 …… Semiconductor laser 21 …… Motor 29 …… Speed detection circuit 30 …… Time measurement circuit 31 …… Laser drive circuit
───────────────────────────────────────────────────── フロントページの続き (72)発明者 細谷 英樹 島根県大田市下丸子３丁目30番２号 キヤ ノン株式会社内 (72)発明者 松岡 宏 島根県大田市下丸子３丁目30番２号 キヤ ノン株式会社内 (72)発明者 松岡 和彦 島根県大田市下丸子３丁目30番２号 キヤ ノン株式会社内 (72)発明者 臼井 正幸 島根県大田市下丸子３丁目30番２号 キヤ ノン株式会社内 (72)発明者 箕浦 一雄 島根県大田市下丸子３丁目30番２号 キヤ ノン株式会社内 (72)発明者 川口 文朗 神奈川県川崎市中原区今井上町53番地 キ ヤノン株式会社小杉事業所内 (72)発明者 鈴木 健一 神奈川県川崎市中原区今井上町53番地 キ ヤノン株式会社小杉事業所内 (72)発明者 敷地 聡 神奈川県川崎市中原区今井上町53番地 キ ヤノン株式会社小杉事業所内 (56)参考文献 特開 昭52−67302（ＪＰ，Ａ) 特開 昭60−50637（ＪＰ，Ａ) 特開 昭59−40376（ＪＰ，Ａ) 特開 昭53−112039（ＪＰ，Ａ) 特開 昭59−104730（ＪＰ，Ａ) 特開 昭60−59542（ＪＰ，Ａ) 特開 昭60−214432（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Hideki Hosoya 3-30-2 Shimomaruko, Ota-shi, Shimane Canon Inc. (72) Inventor Hiroshi Matsuoka 3-30-2 Shimomaruko, Ota-shi, Shimane Canon Incorporated (72) Inventor Kazuhiko Matsuoka 3-30-2 Shimomaruko, Ota-shi, Shimane Canon Inc. (72) Inventor Masayuki Usui 3-30-2 Shimomaruko, Ota-shi, Shimane Canon Inc. ( 72) Inventor Kazuo Minoura 3-30-2 Shimomaruko, Ota City, Shimane Prefecture, Canon Inc. Kenichi Suzuki 53 53 Imaiue-cho, Nakahara-ku, Kawasaki-shi, Kanagawa Canon Inc. Kosugi Plant (72) Inventor Satoshi Kanagawa Prefecture 53, Imaiue-cho, Nakahara-ku, Saki-shi, Canon Inc. Kosugi Plant (56) References JP-A-52-67302 (JP, A) JP-A-60-50637 (JP, A) JP-A-59-40376 (JP) , A) JP 53-112039 (JP, A) JP 59-104730 (JP, A) JP 60-59542 (JP, A) JP 60-214432 (JP, A)
Claims (1)
ラックの内の所望のトラックに対して、情報の記録と再
生とで強度の異なる光ビームを照射すると共に前記光ビ
ームを前記トラックに対してトラッキング制御しながら
情報の記録又は再生を行う光学的情報記録再生方法にお
いて、前記光ビームと前記媒体とを相対的に往復運動さ
せながら情報の記録を行う動作段階と、前記往復運動を
停止させ、前記光ビームと前記媒体とを静止状態で待機
させる、情報の記録又は再生を行わない非動作段階と、
前記非動作段階時において、前記記録媒体上に照射され
る光ビームの強度を前記トラッキング制御可能で且つ前
記記録時及び再生時の強度より低い強度に低下させる段
階とを有する事を特徴とする光学的情報記録再生方法。1. A light beam having different intensities for recording and reproducing information is applied to a desired track among a plurality of tracks provided on an optical information recording medium, and the light beam is applied to the track. On the other hand, in an optical information recording / reproducing method for recording or reproducing information while performing tracking control, an operation step of recording information while relatively reciprocating the light beam and the medium, and stopping the reciprocating movement. A non-operation stage in which the light beam and the medium are made to stand by in a stationary state and information is not recorded or reproduced,
The step of lowering the intensity of the light beam with which the recording medium is irradiated to the tracking controllable level and lower than the intensity during the recording and reproduction during the non-operation stage. Information recording and reproducing method.
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60084111A JPH0727638B2 (en) | 1985-04-19 | 1985-04-19 | Optical information recording / reproducing method |
| DE19853546067 DE3546067A1 (en) | 1984-12-29 | 1985-12-24 | RECORDING / PLAYBACK DEVICE FOR OPTICAL INFORMATION |
| DE3546718A DE3546718C2 (en) | 1984-12-29 | 1985-12-24 | |
| GB08531770A GB2172138A (en) | 1984-12-29 | 1985-12-24 | Optical recording-reproducing apparatus |
| FR858519290A FR2580413B1 (en) | 1984-12-29 | 1985-12-27 | OPTICAL INFORMATION RECORDING-REPRODUCING APPARATUS |
| CA000498689A CA1267725A (en) | 1984-12-29 | 1985-12-27 | Optical information recording-reproducing apparatus and method |
| CH5555/85A CH665043A5 (en) | 1984-12-29 | 1985-12-30 | APPARATUS FOR RECORDING AND REPRODUCING OPTICAL INFORMATION. |
| US07/166,802 US4912697A (en) | 1984-12-29 | 1988-03-03 | Apparatus and method for preventing recording errors due to a reduction in the relative speed between an information carrying light beam and a recording medium |
| US07/399,719 US5010534A (en) | 1984-12-29 | 1989-08-29 | Optical information recording-reproducing apparatus |
| FR9007160A FR2646546B1 (en) | 1984-12-29 | 1990-06-08 | METHOD FOR OPTICALLY RECORDING AND / OR REPRODUCING INFORMATION ON A CARD-LIKE MEDIUM |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60084111A JPH0727638B2 (en) | 1985-04-19 | 1985-04-19 | Optical information recording / reproducing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61242338A JPS61242338A (en) | 1986-10-28 |
| JPH0727638B2 true JPH0727638B2 (en) | 1995-03-29 |
Family
ID=13821410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60084111A Expired - Fee Related JPH0727638B2 (en) | 1984-12-29 | 1985-04-19 | Optical information recording / reproducing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0727638B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2710961B2 (en) * | 1988-10-07 | 1998-02-10 | キヤノン株式会社 | Optical information recording / reproducing device |
| JPH03290834A (en) * | 1990-04-09 | 1991-12-20 | Nippon Conlux Co Ltd | Driving method for laser diode for optical card recording /reproducing device |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6057135B2 (en) * | 1975-12-01 | 1985-12-13 | 松下電器産業株式会社 | optical recording and reproducing device |
| JPS5940376A (en) * | 1982-08-31 | 1984-03-06 | Toshiba Corp | Disk record reproducer |
| JPS6050637A (en) * | 1983-08-29 | 1985-03-20 | Hitachi Ltd | Optical disc device |
-
1985
- 1985-04-19 JP JP60084111A patent/JPH0727638B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61242338A (en) | 1986-10-28 |
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