JPH0711864B2 - Optical disc recording / reading method - Google Patents
Optical disc recording / reading methodInfo
- Publication number
- JPH0711864B2 JPH0711864B2 JP57051221A JP5122182A JPH0711864B2 JP H0711864 B2 JPH0711864 B2 JP H0711864B2 JP 57051221 A JP57051221 A JP 57051221A JP 5122182 A JP5122182 A JP 5122182A JP H0711864 B2 JPH0711864 B2 JP H0711864B2
- Authority
- JP
- Japan
- Prior art keywords
- recording
- light
- reading
- disk
- reflectance
- 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 - Lifetime
Links
Classifications
-
- 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
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Recording Or Reproduction (AREA)
Description
【発明の詳細な説明】 本発明はレーザ光等の記録用エネルギービームによつ
て、所定の基板上に設けられた記録用薄膜に、たとえば
映像や音声などのアナログ信号をFM変調したものや、た
とえば電子計算機のデータや、フアクシミリ信号などの
デイジタル情報をリアルタイムで記録・読出しすること
が可能な方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention uses a recording energy beam such as a laser beam to a recording thin film provided on a predetermined substrate and FM-modulates an analog signal such as video or audio, For example, the present invention relates to a method capable of recording and reading data of an electronic computer and digital information such as facsimile signals in real time.
従来、レーザ光による記録および読出しは、デイスク状
の記録媒体の場合に外周の記録パワーを内周の記録パワ
ーより高くしても内周において記録点同志がくつついて
しまわないような工夫はされているが、基本的には固定
パワーで行なわれている。しかしデイスクの製造プロセ
スにおいて、記録媒体の膜厚・組成などのバラツキを完
全に無くすることはできない。従つて、これらのバラツ
キに対する許容幅を小さくすると、歩留りが悪くなる。Conventionally, recording and reading with a laser beam have been devised so that, even in the case of a disk-shaped recording medium, even if the recording power on the outer circumference is made higher than the recording power on the inner circumference, the recording points do not stick together on the inner circumference. However, it is basically done with fixed power. However, in the disk manufacturing process, it is impossible to completely eliminate the variations in the film thickness and composition of the recording medium. Therefore, if the allowable width for these variations is reduced, the yield will deteriorate.
従つて本発明の目的は上記した従来技術の欠点を無く
し、デイスクの記録または読出し特性がある程度変化し
ても、あるいは記録・再生光ヘッドのレンズが多少汚れ
ても再現性良く記録および記録の読出しが行なえるよう
な光ディスクの記録・読出し方法を提供することにあ
る。Therefore, the object of the present invention is to eliminate the above-mentioned drawbacks of the prior art and to perform recording and reading of recording with good reproducibility even if the recording or reading characteristics of the disk are changed to some extent or the lens of the recording / reproducing optical head is somewhat dirty. Another object of the present invention is to provide a recording / reading method of an optical disc that can be performed by
上記の目的を達成するために本発明の光デイスク装置に
おいては、デイスクを装着した状態でデイスクの光反射
率および光透過率のうちの少なくとも一方を計測し、そ
の値に応じて記録光および読出し光のうちの少なくとも
一方のパワーおよび照射時間のうちの少なくとも一方を
変化させる。これらの変化のさせ方にはいくつかの方法
がある。１つは光反射率または光透過率の測定値を１回
だけ、あるいは長い周期で非連続的に取り出し、その値
に応じて記録光および読出し光のパワーおよび照射時間
の少なくとも一方を変化させ、次の測定まではその値に
保つ方法であつて、デイスク装着直後に１度だけ上記の
測定値を取り出し、それによつて変化させたパワーの値
または照射時間の値をデイスクを取り外すまで保つ方法
もこの中に含まれる。In order to achieve the above object, in the optical disk device of the present invention, at least one of the optical reflectance and the optical transmittance of the disk is measured with the disk attached, and the recording light and the reading light are read out according to the value. At least one of the power of at least one of the lights and the irradiation time is changed. There are several ways to make these changes. One is to take out the measured value of the light reflectance or the light transmittance only once or discontinuously in a long cycle, and change at least one of the power and the irradiation time of the recording light and the reading light according to the value, Until the next measurement, there is also a method to keep that value, and to take out the above measurement value only once immediately after installing the disc, and to keep the changed power value or irradiation time value until the disc is removed. Included in this.
他の１つは光反射率または光透過率の測定値を連続的
（短かい周期での断続も含む）に取り出し、その値に応
じて連続的に記録光および読出し光のパワーおよび照射
時間の少なくとも一方を変化させる（短かい周期で非連
続的に変化させることを含む）方法である。この場合、
デイスク上の場所による膜厚や光透過率、光反射率のバ
ラツキに確実に対応することができるが、制御方法がよ
り複雑になる。特に１つのレーザビームで光反射率また
は光透過率の測定と記録または記録の読出しを行なう場
合、レーザの出力を他の方法で常に正確に測定しておか
ないと、レーザの温度変化が記録光の強度を変化させた
結果があたかも光反射率が増したように観測され、制御
回路が働いてさらに記録光強度を大きくするというよう
に、どんどん記録光強度が大きくなり、制御不能とな
る。The other one is to take out the measured value of the light reflectance or the light transmittance continuously (including intermittently in a short cycle), and continuously change the power and irradiation time of the recording light and the reading light according to the value. It is a method of changing at least one (including changing discontinuously in a short cycle). in this case,
It is possible to reliably deal with variations in film thickness, light transmittance, and light reflectance depending on the location on the disk, but the control method becomes more complicated. Especially when measuring the light reflectance or light transmittance with one laser beam and recording or reading the recording, unless the laser output is always accurately measured by another method, the temperature change of the laser causes the recording light to change. The result of changing the intensity of is observed as if the light reflectance was increased, and the control circuit works to further increase the recording light intensity, so that the recording light intensity increases and becomes uncontrollable.
上記記録光および読出し光のうちの少なくとも一方の、
強度および照射時間のうちの少なくとも一方を変化させ
る前に、レーザの出力パワーをレーザ光の出射側または
その反対側の検出器で測定しておくことが好ましい。At least one of the recording light and the reading light,
Before changing at least one of the intensity and the irradiation time, it is preferable to measure the output power of the laser with a detector on the emitting side of the laser light or on the opposite side.
たとえばTe−Se系薄膜の光反射率および光透過率の膜厚
および組成依存性は第１図のようになつているから、膜
形成時に組成の制御が完全に行なわれている場合、光反
射率を知れば膜厚がわかり、あらかじめ各組成および膜
厚の組合わせについて記録特性を調べておけば記録光の
強度および照射時間をどの値にすればよいかがわかる。
記録の読出し光の強度も光反射率に応じて決められる。
一方、膜厚の制御は完全に行なわれているが組成の制御
が不完全な場合、光反射率を知れば組成がわかり、記録
光の強度をどの値にすればよいかがわかる。組成および
膜厚の両方にバラツキがある場合にも、光透過率および
光反射率の両方を知れば、第１図から膜厚および組成の
推定値を決定することができ、最適記録光強度および照
射時間が決められる。記録光強度または記録の読出し光
の強度は、上記のような制御のほか、デイスクの外周か
ら内周に向かつて記録パワーおよび照射時間のうちの少
なくとも一方を変化させるなどの制御が重ね合わせて行
なわれてもよい。また、記録光の反射光の、記録の進行
（たとえば孔形成）による時間的強度変化を知り、その
速度が最適記録の場合の速度に一致するように記録パル
ス光の強度を変える制御を重ね合わせて行なつてもよ
い。For example, the dependence of the light reflectance and light transmittance of a Te-Se thin film on the film thickness and composition is as shown in Fig. 1. Therefore, when the composition is completely controlled during film formation, By knowing the ratio, the film thickness can be known, and by examining the recording characteristics for each combination of composition and film thickness in advance, the values of the recording light intensity and the irradiation time can be known.
The intensity of the reading light for recording is also determined according to the light reflectance.
On the other hand, when the film thickness is completely controlled but the composition is not completely controlled, the composition can be known by knowing the light reflectance, and the value of the intensity of the recording light can be known. Even if there are variations in both the composition and the film thickness, if both the light transmittance and the light reflectance are known, the estimated values of the film thickness and the composition can be determined from FIG. Irradiation time is decided. In addition to the above control, the recording light intensity or the recording read light intensity is superposed by control such as changing at least one of the recording power and the irradiation time from the outer circumference to the inner circumference of the disk. You may In addition, control of changing the intensity of the recording pulse light is performed so that the change in the intensity of the reflected light of the recording light due to the progress of recording (for example, hole formation) can be known and the speed can be matched with the speed for optimum recording. You may do this.
本発明の装置では、異種のデイスクを共用しても、あら
かじめその光反射率または透過率と最適記録・再生パワ
ーとの関係を記憶させておけば、利用者が意識しなくて
も最適の記録・再生が行なえる。光ディスク装置にとっ
て上記の光反射率または透過率と最適記録・再生パワー
との関係が既知である場合にはデイスクの種類をデイス
クから読み取れるように、デイスク名をデイスクに記録
しておいてもよい。In the device of the present invention, even if different types of disks are shared, if the relationship between the optical reflectance or the transmittance and the optimum recording / reproducing power is stored in advance, the optimum recording can be performed without the user's awareness.・ Playback is possible. If the relationship between the optical reflectance or transmittance and the optimum recording / reproducing power is known to the optical disk device, the disk name may be recorded on the disk so that the disk type can be read from the disk.
以下に本発明を実施例によつて詳細に説明する。The present invention will be described in detail below with reference to examples.
実施例１ 第２図に示したように、記録・再生装置に、デイスク３
を装着しない状態で、記録・再生ヘツド１が決まつた位
置に停止するようにしておき、その位置ではヘツドから
のレーザ光が固定のデイテクター２に入射し、強度を正
確に補正できるようにしておく。次にTe−Se系の記録膜
を持つたデイスク３を装着して、レーザ光がデイスク面
に当たるような所定の位置に記録ヘツドを停止させた状
態で、反射光を同じヘツド１の読出し信号取出し用のデ
イテクターで受けて強度を検出する。この場合のヘツド
の停止位置をデイスク装着前のヘツドの停止位置と同じ
にしておけば、デイスク装着前にレーザ光出力を検出し
たのと同じデイテクター２でデイスクの光透過率を測定
することができる。ただしこの場合は、デイスク装着時
にこのデイテクターにデイスクが当たらないような装着
方法とする必要がある。記録・再生ヘツドとは別に、透
過率または反射率測定専用の光源（たとえばLED）やデ
イテクターを設けてもよい。反射率や透過率の測定は、
デイスクを回転させながら行なつた方がよい。反射率の
みを測定する場合には膜組成のバラツキをできるだけ小
さくしたデイスクを使用し、反射率から第１図を用いて
膜厚を推定して記録レーザパワーおよび照射時間および
読出しレーザパワーを決めた。反射率と透過率の両方を
測定する場合には、これらから膜厚と膜組成の両方を推
定し、記録レーザパワーおよび読出しレーザパワーを決
めた。これらのパワーの値は、デイスク上の同一トラツ
クに対してはデイスク交換まで一定とした。ただし記録
トラツクの半径が変わると、記録レーザパワーＰは半径
をｒとして記録パワーを の式に従つて変化させ、常に良好な読出し信号が得られ
るようにした。ただし再外周における半径と記録パワー
をr0,P0とした。デイスクを交換する場合は、交換の度
に上記の操作を行なつた。Embodiment 1 As shown in FIG. 2, the recording / reproducing apparatus has a disk 3
The recording / reproducing head 1 should be stopped at a fixed position without mounting the so that the laser light from the head is incident on the fixed detector 2 at that position so that the intensity can be accurately corrected. deep. Next, a disk 3 having a Te-Se type recording film is attached, and the recording head is stopped at a predetermined position where the laser beam hits the disk surface, and the reflected light is taken out from the same head 1 as a read signal. It is received by the detector for and the strength is detected. If the head stop position in this case is set to be the same as the head stop position before the disk is mounted, the optical transmittance of the disk can be measured by the same detector 2 that detects the laser light output before the disk is mounted. . However, in this case, it is necessary to use a mounting method that prevents the disk from hitting the detector when mounting the disk. In addition to the recording / reproducing head, a light source (for example, LED) or a detector dedicated to the measurement of transmittance or reflectance may be provided. To measure reflectance and transmittance,
It is better to do it while rotating the disk. In the case of measuring only the reflectance, a disk having the smallest variation in the film composition was used, and the film thickness was estimated from the reflectance by using FIG. 1 to determine the recording laser power, the irradiation time and the read laser power. . When measuring both the reflectance and the transmittance, both the film thickness and the film composition were estimated from these, and the recording laser power and the reading laser power were determined. These power values were kept constant until the disc was replaced for the same track on the disc. However, if the radius of the recording track changes, the recording laser power P will be It was changed according to the formula (1) so that a good read signal can always be obtained. However, the radius and recording power at the outer circumference were r 0 and P 0 . When replacing the disk, the above operation was performed each time.
同様にして、デイスク感度の経時変化（光ヘッドの集光
レンズ、ディスク基板の汚れの影響等も含む）に対処す
ることも可能である。集光レンズや基板の汚れに起因す
る記録膜への到達光量減少による記録に必要なレーザパ
ワーの増大と戻り光量の減少は、光ヘッド側では記録膜
の酸化等による記録に必要なレーザパワー増大を伴った
戻り光量減少と区別できず、対処のしかたも同じでよ
い。すなわち、初期の反射率または透過率を測定後、デ
イスクを強制劣化させ、あるいは集光レンズ表面を汚
し、劣化した場合の反射率または透過率と最適記録パワ
ーまたは最適照射時間を求めておく。そして全デイスク
について初期の反射率または透過率を求めておけば、あ
るいはディスクの反射率または透過率のバラツキをでき
るだけ小さくしておけば反射率の初期値と劣化後の値の
差の何分の１変化したかに応じて記録パワーを調節する
ことによりデイスクが劣化してもあるいは汚れを生じて
も最適の記録が行なえる。In the same manner, it is possible to deal with the temporal change of the disc sensitivity (including the influence of the condensing lens of the optical head, the contamination of the disk substrate, etc.). The increase in the laser power required for recording and the decrease in the amount of return light due to the decrease in the amount of light reaching the recording film due to the contamination of the condenser lens and the substrate increase the laser power required for recording due to the oxidation of the recording film on the optical head side. It is indistinguishable from the decrease in the amount of return light accompanied by, and the same treatment method may be used. That is, after the initial reflectance or transmittance is measured, the reflectance or transmittance and the optimum recording power or the optimum irradiation time when the disk is forcibly deteriorated or the condenser lens surface is soiled and deteriorated are obtained. Then, if the initial reflectance or transmittance is obtained for all disks, or if the variation in the reflectance or transmittance of the disk is made as small as possible, what is the difference between the initial value of reflectance and the value after deterioration? By adjusting the recording power according to the change, optimum recording can be performed even if the disk deteriorates or becomes dirty.
デイスク装着直後の光反射率測定は、ヘツド１をデイス
クの半径方向に移動させて多数カ所で行ない、記録時に
はディスク作製時の半径方向の膜厚ムラなどに起因する
反射率の半径方向の変化に応じたレーザ光パワーまたは
照射時間の変化と、 に従がうパワー変化とを重畳させるのがさらに好まし
い。Immediately after the disc is mounted, the light reflectance is measured at a number of locations by moving the head 1 in the radial direction of the disc. Depending on the change of laser light power or irradiation time, It is more preferable to superimpose the power change according to the above.
実施例２ 半導体レーザの、記録光が出る側とは反対の側にフオト
ダイオードを取付け、このフオトダイオード側に出て来
た光を受けて常にレーザ出力をモニターできるようにし
た。出力変動をレーザ駆動電流にネガテイブフイードバ
ツクし、出力変動は±１％以内とした。デイスクからの
反射光は、光源には戻らないように、1/4波長板および
偏光プリズムによつて入射光に直角の方向に反射させら
れ、トラツキング信号検出用のデイテクターと自動焦点
合わせ信号検出用デイテクターに分離して入射させられ
る。これらの信号のうちのいずれかは、読出し信号検出
にも利用される。読出し信号の強度、特に記録ピツトが
無い部分の強度は、デイスクの光反射率に比例する。記
録時にも、記録パルスが出ていない時には低いパワーで
トラツキング信号検出と自動焦点合わせ信号検出が行な
われており、やはり光反射率に比例する出力を取出すこ
とは可能である。このようにして、記録または読出しを
行なう部分の光反射率を常時知ることにより、その部分
の膜厚を推定し、最適の記録パワーおよび照射時間（パ
ルス幅）で記録し、読出し光のパワーレベルも最適とす
ることが可能であつた。Example 2 A photodiode was attached to the side of the semiconductor laser opposite to the side from which the recording light was emitted, so that the laser output could be constantly monitored by receiving the light emitted to this photodiode side. The output fluctuation was negatively fed back to the laser drive current, and the output fluctuation was within ± 1%. The reflected light from the disk is reflected by the quarter-wave plate and the polarizing prism in the direction perpendicular to the incident light so that it does not return to the light source. The detector for tracking signal detection and the automatic focusing signal detection It is incident on the detector separately. Either of these signals is also used for read signal detection. The intensity of the read-out signal, especially the intensity of the portion without the recording pit, is proportional to the optical reflectance of the disk. Even during recording, when the recording pulse is not output, the tracking signal detection and the automatic focusing signal detection are performed with low power, and it is possible to extract the output proportional to the light reflectance. In this way, by always knowing the light reflectance of the portion where recording or reading is performed, the film thickness of that portion is estimated, recording is performed with the optimum recording power and irradiation time (pulse width), and the power level of the reading light is determined. Could also be optimal.
以上詳述したように本発明の装置ではデイスクの記録・
再生特性にバラツキがあつたり、多種類のデイスクを用
いる場合にも、また、レンズ等が汚れた場合にも常に最
適の記録・再生が行なえ、得られる利益は極めて大き
い。As described above in detail, in the apparatus of the present invention, the disk recording /
Optimal recording and reproduction can always be performed even when the reproduction characteristics vary, or when various types of disks are used, or when the lens or the like is dirty, and the obtained profit is extremely large.
第１図a,bは本発明の実施の際に用いる、光デイスクの
記録膜の膜厚および組成と、光透過率および光反射率と
の関係を示す図、第２図は、本発明の１実施例である装
置の概略を示す図である。 １……再生ヘツド、２……デイテクター、３……デイス
ク。1A and 1B are views showing the relationship between the film thickness and composition of a recording film of an optical disc, and the light transmittance and the light reflectance, which are used in the practice of the present invention, and FIG. It is a figure which shows the outline of the apparatus which is one Example. 1 ... Reproduction head, 2 ... Detector, 3 ... Disk.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 重松 和男 東京都国分寺市東恋ケ窪１丁目280番地 株式会社日立製作所中央研究所内 (72)発明者 宮内 靖 東京都国分寺市東恋ケ窪１丁目280番地 株式会社日立製作所中央研究所内 (72)発明者 堀篭 信吉 東京都国分寺市東恋ケ窪１丁目280番地 株式会社日立製作所中央研究所内 (56)参考文献 特開 昭53−100809（ＪＰ，Ａ) 特開 昭53−50707（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazuo Shigematsu 1-280 Higashi Koikeku, Kokubunji, Tokyo Inside Central Research Laboratory, Hitachi, Ltd. (72) Inventor Yasushi Miyauchi 1-280, Higashi Koikeku, Kokubunji, Tokyo Hitachi, Ltd. In the Central Research Laboratory (72) Inventor Shinkichi Hori 1-280, Higashi Koikeku, Kokubunji City, Tokyo Metropolitan Research Laboratory, Hitachi, Ltd. (56) References JP-A-53-100809 (JP, A) JP-A-53-50707 (JP) , A)
Claims (7)
ディスクの光反射率を計測する工程、その値に応じて記
録光または読出し光のうちの少なくとも一方の、強度お
よび照射時間のうちの少なくとも一方を変化させ、次の
計測まで一定に保つ工程を有し、上記計測に用いるレー
ザビームと、上記記録光および読出し光として用いるレ
ーザビームとが同一であり、上記計測は、ディスク上の
記録ピットが無い部分で行うことを特徴とする光ディス
クの記録・読出し方法。1. A method of mounting an optical disk in a recording device, a step of measuring a light reflectance of the optical disk, and at least one of intensity and irradiation time of at least one of recording light and reading light according to the value. And a laser beam used as the recording light and the reading light are the same as each other. A recording / reading method for an optical disk, which is performed in a non-existing portion.
の、強度および照射時間のうちの少なくとも一方を変化
させる工程より前に、レーザの出力パワーをレーザ光の
出射側またはその反対側の検出器で測定する工程を有す
ることを特徴とする特許請求の範囲第１項記載の光ディ
スクの記録・読出し方法。2. The laser output power is detected on the emission side of the laser beam or on the opposite side thereof before the step of changing at least one of the intensity and the irradiation time of one of the recording light and the reading light. The optical disk recording / reading method according to claim 1, further comprising a step of measuring with an instrument.
光ディスク装置に光反射率と最適記録・再生パワーとの
関係を記憶させておく工程を有することを特徴とする特
許請求の範囲第１項記載の光ディスクの記録・読出し方
法。3. Before the step of measuring the light reflectance,
The optical disc recording / reading method according to claim 1, further comprising the step of storing the relationship between the optical reflectance and the optimum recording / reproducing power in the optical disc device.
の、強度および照射時間のうちの少なくとも一方を変化
させる工程の前にヘッドを光ディスクの外周から内周に
向かって半径方向に移動させて多数カ所で反射率測定を
行う工程を有することを特徴とする特許請求の範囲第１
項記載の光ディスクの記録・読出し方法。4. The head is moved in the radial direction from the outer circumference to the inner circumference of the optical disk before the step of changing at least one of intensity and irradiation time of one of the recording light and the reading light. Claim 1 characterized in that it has a step of measuring reflectance at a large number of points.
A method for recording / reading an optical disc according to the item.
関係がわかるように、ディスクの種類をその一部分に記
録したことを特徴とする特許請求の範囲第１項記載の光
ディスクの記録・読出し方法。5. The recording / reading of an optical disc according to claim 1, wherein the type of the disc is recorded in a part of the disc so that the relationship between the optical reflectance of the disc and the optimum recording power can be seen. Method.
ディスクの光反射率を計測する工程、その値に応じて記
録光または読出し光のうちの一方の、強度および照射時
間のうちの少なくとも一方を変化させ、次の計測まで一
定に保つ工程を有し、上記計測に用いるレーザビーム
と、上記記録光および読出し光として用いるレーザビー
ムとが同一であり、上記計測は、記録中に、記録パルス
が出ていない時に行うことを特徴とする光ディスクの記
録・読出し方法。6. A step of mounting an optical disk in a recording device, a step of measuring a light reflectance of the optical disk, and at least one of intensity and irradiation time of recording light or reading light depending on the value. The laser beam used for the measurement is the same as the laser beam used for the recording light and the reading light, and the recording pulse is changed during recording. A method for recording / reading an optical disk, characterized in that it is carried out when it is not out.
録パワーとの関係がわかるように、ディスクの種類をそ
の一部分に記録したことを特徴とする特許請求の範囲第
６項記載の光ディスクの記録・読出し方法。7. The optical disk according to claim 6, wherein the kind of the disk is recorded in a part of the disk so that the relationship between the optical reflectance or the transmittance of the disk and the optimum recording power can be seen. Recording / reading method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57051221A JPH0711864B2 (en) | 1982-03-31 | 1982-03-31 | Optical disc recording / reading method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57051221A JPH0711864B2 (en) | 1982-03-31 | 1982-03-31 | Optical disc recording / reading method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58169336A JPS58169336A (en) | 1983-10-05 |
| JPH0711864B2 true JPH0711864B2 (en) | 1995-02-08 |
Family
ID=12880871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57051221A Expired - Lifetime JPH0711864B2 (en) | 1982-03-31 | 1982-03-31 | Optical disc recording / reading method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0711864B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5998333A (en) * | 1982-11-27 | 1984-06-06 | Canon Inc | Information recording and reproducing device |
| JPH0628110B2 (en) * | 1984-04-20 | 1994-04-13 | 松下電器産業株式会社 | Servo gain stabilization circuit |
| JPS647327A (en) * | 1987-03-25 | 1989-01-11 | Casio Computer Co Ltd | Method and apparatus for optical information recording |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5845096B2 (en) * | 1976-10-18 | 1983-10-07 | 松下電器産業株式会社 | optical recording and reproducing device |
| JPS53100809A (en) * | 1977-02-15 | 1978-09-02 | Matsushita Electric Ind Co Ltd | Recording system |
-
1982
- 1982-03-31 JP JP57051221A patent/JPH0711864B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58169336A (en) | 1983-10-05 |
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