JPH0727639B2 - Optical information recording / reproducing method - Google Patents
Optical information recording / reproducing methodInfo
- Publication number
- JPH0727639B2 JPH0727639B2 JP60124696A JP12469685A JPH0727639B2 JP H0727639 B2 JPH0727639 B2 JP H0727639B2 JP 60124696 A JP60124696 A JP 60124696A JP 12469685 A JP12469685 A JP 12469685A JP H0727639 B2 JPH0727639 B2 JP H0727639B2
- Authority
- JP
- Japan
- Prior art keywords
- recording
- light beam
- optical
- information
- reproducing
- 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)
- Moving Of The Head For Recording And Reproducing By Optical Means (AREA)
- Optical Head (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う装置を指す。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 means a method for recording information on the medium as described above, a method for reproducing information recorded on the medium, and an apparatus for 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，カート状，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情報記録媒体（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 disk, a cart, and a tape have been known as the form of a medium for recording information using light and reading the recorded information. Among these, a card-shaped optical information recording medium (hereinafter referred to as an optical card) is expected to be in great demand as a medium having a large storage capacity that is small and lightweight and convenient to carry.
上記の光カードは、記録情報に従って変調され、微小ス
ポツトに絞った光ビームで、カード上に予め設定された
記録領域内の記録トラツクを走査することによって、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）する必要があった。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。従って、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って
行なっていた。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 light beam focused on a minute spot to scan a recording track in a preset recording area on the card. 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 Had to do so). Also,
Focus control (autofocusing, hereinafter referred to as AF) was also performed to accurately focus the light beam on the card. Therefore, the tracking signal from the recording track,
In order to obtain the focusing signal, the modulated light beam was set to have a predetermined power such that writing was not performed on the card even at the minimum level. 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っていた。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
積によって誤信号が書き込まれてしまう場合があった。
このような誤信号はやはり光ビームによって検出され、
トラツクアクセスなどの際に大きな支障となった。However, in such a conventional device, if the stationary state of the light beam continues for a long time, an erroneous signal may be written due to energy accumulation even in the light beam at a level where writing as described above is not performed. there were.
Such false signals are still detected by the light beam,
It became a big obstacle in the case of truck access.
本発明の目的は、かかる従来装置の欠点を解決し、非動
作時の光ビームによる誤信号の書き込みを防止し、常に
正確な記録又は再生動作の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, to prevent writing of an erroneous signal due to a light beam during non-operation, and to provide an optical information recording / reproducing method capable of always performing an accurate recording or reproducing operation. It is in.
本発明の上記目的は、 記録領域と非記録領域とを有する光学的情報記録媒体に
対して光ヘッドより光ビームを照射する事により、情報
の記録、再生の少なくとも一方を行う光学的情報基録再
性方法において、前記記録媒体と前記光ヘッドとを往復
運動させながら前記記録媒体の記録領域に情報の記録又
は再生を行う動作段階と、前記往復運動を停止し前記光
ヘッドを前記媒体上で静止状態で待機させる前記記録又
は再生を行わない非動作段階と、前記非動作段階時に、
光ヘッドを前記記録媒体上の非記録領域に退避させると
共に前記非記録領域においては、光ヘッドより光ビーム
の照射を停止する退避段階とを含むことによって達成さ
れる。The above-mentioned object of the present invention is to record an optical information that records and / or reproduces information by irradiating an optical information recording medium having a recording area and a non-recording area with a light beam from an optical head. In the reproducing method, an operation step of recording or reproducing information in a recording area of the recording medium while reciprocating the recording medium and the optical head, and stopping the reciprocating movement of the optical head on the medium. In the non-operation stage in which the recording or reproduction is not made to stand by in a stationary state and the non-operation stage,
This is achieved by including a step of retracting the optical head to a non-recording area on the recording medium, and including a retracting step of stopping irradiation of a light beam from the optical head in the non-recording area.
以下、図面を用いて本発明の実施例を説明する。 Embodiments of the present invention will be described below 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
の位置例を示す概略平面図である。図中、１は光カード
を示し、その一部の破線で囲まれた部分には記録領域２
が設けられている。この記録領域には光ビームの照射に
よって凹凸或いは反射率の変化等で情報が記録される記
録層が形成されている。また、３は記録領域２内に複数
本の直線状に形成された記録トラツク４は所定速度で光
ビームが走査される記録領域のデータエリア、５は所望
トラツクの検索がなされる記録領域のトラツク選択エリ
ア、６は記録領域外に設けられた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６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５をａ方向に移動し、記録又は再生しようとす
るトラツクを見つける。そして、光ビームはトラツクの
データエリア４を矢印ｂ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５内で停止する。そして、この動作を繰り
返すことによって、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 the position of an optical card used in the information recording / reproducing method of the present invention. In the figure, reference numeral 1 denotes an optical card, and a recording area 2 is provided in a part surrounded by a broken line.
Is provided. In this recording area, a recording layer is formed in which information is recorded due to unevenness or a change in reflectance due to irradiation with a light beam. Further, 3 is a recording track 4 formed in a plurality of straight lines in the recording area 2, 4 is a data area of a recording area where a light beam is scanned at a predetermined speed, and 5 is a track of a recording area in which a desired track is searched. The selection area 6 is a home position provided outside the recording area. The light beam is initially stationary at home position 6. When recording or reproducing, the light beam first moves in the track selection area 5 in the a direction to find a track to be recorded or reproduced. Then, the light beam scans the track data area 4 in the direction of the arrow b to perform recording or reproduction. When recording or reproduction is completed, the light beam stops in the track selection area 5. 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PWL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. During recording, the light beam does not form recording pits in the scanning range Ew corresponding to the data area as shown in (A), and always emits light with the minimum power P WL required to obtain the tracking signal and the focusing signal. The card is illuminated. Then, according to the recording signal, it is modulated between the power P WH required for recording,
The recording pits are formed only on the part 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。従って、第４図の
ように光ビームのスポツトが72から71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PWL或いはPRであっ
ても誤記録されてしまう。本発明はこのような誤記録を
防止する為、記録又は再生を行なっている時以外には光
カード上の光ビームの照射位置を記録領域外に退避させ
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 7 2 to 7 1 at the relative velocity V as shown in FIG. 4, if V is Φ / T or more, V is not recorded if the spot diameter is Φ. However, as described above, when the light beam is standing by in a stationary state, if this state continues for a long time, erroneous recording will occur even if the optical power is P WL or P R as described above. In order to prevent such erroneous recording, the present invention retracts the irradiation position of the light beam on the optical card outside the recording area except when recording or reproducing.
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によって矢印ｃ方向に移動し、これに伴っ
て、光カード１もｃ方向に移動する。従って、光カード
上においては、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
でカード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32,フ
オーカス制御回路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 in the direction of arrow c by the motor 21. Accordingly, the optical card 1 is also moved in the direction of c. Therefore, on the optical card, the light beam 32 emitted from the optical head 16 is scanned in the direction b in FIG. The optical 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 light spots on the card 1 by the objective lens 14 as light. Also,
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 32, 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 in the direction perpendicular to the optical axis to 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、これによって第２図ａ方向に光ビームの照射
位置移動させ、トラツクアクセス（シーク動作）を行な
う。前記モータ21は、モータ駆動回路25によって制御さ
れ、光カードの移動、停止を行なう。更に、信号復調回
路22,ステツピングモータ28,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。A stepping motor 28 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. 2A to perform track access (seek operation). The motor 21 is controlled by a motor drive circuit 25 to move or stop the optical card. Further, the signal demodulation circuit 22, the stepping motor 28, 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の制御によって、モータ21及びステツピング
モータ28が駆動され、第２図で説明したように光ビーム
はホームポジシヨン６を離れ、記録領域内を走査する。
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PWL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ってパワー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。動作が終了すると、モータ21は
停止し、光ビームはパワーPWL或いはPR有したままトラ
ツク選択エリア内に停止する。続いて、CPU27の制御に
従ってステツピングモータ28を駆動し、第５図の如く光
ヘツド16を矢印ｄ方向に移動し、光ビーム32を光カード
１上で記録領域２から退避させて、ホームポジシヨン６
内に静止状態で待機させる。そして再び動作を開始する
場合には、前述の動作を繰り返し、光ビーム32はホーム
ポジシヨン６より記録領域２に移動して記録又は再生を
行う。In this apparatus, when performing a recording or reproducing operation, the motor 21 and the stepping motor 28 are driven by the control of the CPU 27, and the light beam leaves the home position 6 to record as described with reference to FIG. Scan the area.
At this time, the light beam 32 from the semiconductor laser 11 always has the power P WL or PR shown in FIG. 3 on the optical card, and at the time of recording, the power P WH according to the recording signal inputted from the terminal C 1
Modulation is performed between and. Also, during reproduction, a reproduction signal is output from the terminal C 2 . When the operation is completed, the motor 21 is stopped, and the light beam is stopped in the track selection area with the power P WL or P R. Subsequently, the stepping motor 28 is driven under the control of the CPU 27, the optical head 16 is moved in the direction of arrow d as shown in FIG. 5, the light beam 32 is retracted from the recording area 2 on the optical card 1, and the home position is adjusted. Shion 6
Stand by in a stationary state. When the operation is started again, the above-described operation is repeated, and the light beam 32 moves from the home position 6 to the recording area 2 to perform recording or reproduction.
上記例では、記録又は再生を行っている時以外には光ビ
ームをホームポジシヨンに退避させたが、記録領域外で
あれば、その他の位置に退避させるように構成してもか
まわない。又、光ビームが記録領域外にあるとき、一旦
半導体レーザの発振を停止して待機させても良いが、こ
の際、再び発振を開始する場合には、やはり記録領域外
で行うことが望ましい。これによって、まれに発生する
レーザ発振の開始時或いは停止時のレーザ光強度のオー
バーシユートにより、前記記録領域に誤記録がなされる
ことを防止することが出来る。In the above example, the light beam is retracted to the home position except when recording or reproducing, but it may be retracted to another position outside the recording area. Further, when the light beam is out of the recording area, the semiconductor laser may be temporarily stopped from oscillation and made to stand by. However, at this time, when the oscillation is started again, it is desirable to perform it outside the recording area. As a result, it is possible to prevent erroneous recording in the recording area due to rare occurrence of laser light intensity overshoot at the start or stop of laser oscillation.
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、記録又は再生を行っている時以外には、光ビームを
記録領域から退避させるようにしたので、動作の待機状
態において誤って記録がなされないようにし、トラツク
検索時等の誤動作を防止する効果を有する。As described above, in the optical information recording / reproducing method of the present invention, the light beam is retracted from the recording area except when the recording or reproducing is performed, and therefore, the recording is erroneously performed in the standby state of the operation. It is possible to prevent malfunction and prevent an erroneous operation at the time of searching a track.
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
情報記録再性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図は記録又は再生終了後の光ヘツドの動きを説
明する概略斜視図である。 １……光カード、２……記録領域、 ３……記録トラツク、４……データエリア、 ５……トラツク選択エリア、 ６……ホームポジシヨン。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 showing an example of an optical card used in the apparatus shown in FIG. A plan view, FIGS. 3A and 3B 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. 5 is a schematic perspective view for explaining the movement of the optical head after the end of recording or reproduction. 1 ... Optical card, 2 ... Recording area, 3 ... Recording track, 4 ... Data area, 5 ... Track selection area, 6 ... Home position.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 箕浦 一雄 東京都大田区下丸子３丁目30番２号 キヤ ノン株式会社内 (56)参考文献 特開 昭52−67302（ＪＰ，Ａ) 特開 昭50−115468（ＪＰ，Ａ) 特開 昭58−56577（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60−50637（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Minoura 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc. (56) Reference JP-A-52-67302 (JP, A) JP-A-50 -115468 (JP, A) JP 58-56577 (JP, A) JP 53-112039 (JP, A) JP 59-104730 (JP, A) JP 60-59542 (JP, A) ) JP-A-60-50637 (JP, A)
Claims (1)
報記録媒体に対して光ヘッドより光ビームを照射する事
により、情報の記録、再生の少なくとも一方を行う光学
的情報記録再生法方において、前記記録媒体と前記光ヘ
ッドとを往復運動させながら前記記録媒体の記録領域に
情報の記録又は再生を行う動作段階と、前記往復運動を
停止前記光ヘッドを前記媒体上で静止状態で待機させる
前記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、光ヘッドを前記記録媒体上の非記録領域に退
避させると共に前記非記録領域においては、光ヘッドよ
り光ビームの照射を停止する退避段階とを含むことを特
徴とする光学的情報記録再生方法。1. An optical information recording / reproducing method for performing at least one of recording and reproducing of information by irradiating an optical information recording medium having a recording area and a non-recording area with a light beam from an optical head. In the operation step of recording or reproducing information in the recording area of the recording medium while reciprocating the recording medium and the optical head, and stopping the reciprocating movement of the optical head in a stationary state on the medium. In the non-operation stage in which the recording or reproduction is not performed and in the non-operation stage, the optical head is retracted to the non-recording area on the recording medium, and in the non-recording area, the irradiation of the light beam from the optical head is stopped. Optical information recording / reproducing method.
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60124696A JPH0727639B2 (en) | 1985-06-07 | 1985-06-07 | Optical information recording / reproducing method |
| DE19853546067 DE3546067A1 (en) | 1984-12-29 | 1985-12-24 | RECORDING / PLAYBACK DEVICE FOR OPTICAL INFORMATION |
| GB08531770A GB2172138A (en) | 1984-12-29 | 1985-12-24 | Optical recording-reproducing apparatus |
| DE3546718A DE3546718C2 (en) | 1984-12-29 | 1985-12-24 | |
| CA000498689A CA1267725A (en) | 1984-12-29 | 1985-12-27 | Optical information recording-reproducing apparatus and method |
| FR858519290A FR2580413B1 (en) | 1984-12-29 | 1985-12-27 | OPTICAL INFORMATION RECORDING-REPRODUCING APPARATUS |
| 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 |
|---|---|---|---|
| JP60124696A JPH0727639B2 (en) | 1985-06-07 | 1985-06-07 | Optical information recording / reproducing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61283032A JPS61283032A (en) | 1986-12-13 |
| JPH0727639B2 true JPH0727639B2 (en) | 1995-03-29 |
Family
ID=14891830
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60124696A Expired - Fee Related JPH0727639B2 (en) | 1984-12-29 | 1985-06-07 | Optical information recording / reproducing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0727639B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2654045B2 (en) * | 1988-01-26 | 1997-09-17 | キヤノン株式会社 | Information recording and playback method |
| JPH05159292A (en) * | 1991-12-06 | 1993-06-25 | Olympus Optical Co Ltd | Information recording and reproducing method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS50115468A (en) * | 1974-02-20 | 1975-09-10 | ||
| JPS6057135B2 (en) * | 1975-12-01 | 1985-12-13 | 松下電器産業株式会社 | optical recording and reproducing device |
| JPS5856577A (en) * | 1981-09-29 | 1983-04-04 | Fujitsu Ltd | Preventing device for cathode-ray tube burning |
-
1985
- 1985-06-07 JP JP60124696A patent/JPH0727639B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61283032A (en) | 1986-12-13 |
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