JPH0127494B2 - - Google Patents
Info
- Publication number
- JPH0127494B2 JPH0127494B2 JP56199269A JP19926981A JPH0127494B2 JP H0127494 B2 JPH0127494 B2 JP H0127494B2 JP 56199269 A JP56199269 A JP 56199269A JP 19926981 A JP19926981 A JP 19926981A JP H0127494 B2 JPH0127494 B2 JP H0127494B2
- Authority
- JP
- Japan
- Prior art keywords
- recording
- optical system
- track
- signal
- 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
Links
- 230000003287 optical effect Effects 0.000 claims description 44
- 239000010409 thin film Substances 0.000 claims description 10
- 239000004065 semiconductor Substances 0.000 claims description 6
- 239000000758 substrate Substances 0.000 claims description 3
- 238000001514 detection method Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000001143 conditioned effect Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000004926 polymethyl methacrylate Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
- G11B7/24085—Pits
Landscapes
- Optical Recording Or Reproduction (AREA)
- Optical Head (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Description
【発明の詳細な説明】
本発明は、光学的に情報を記録および再生する
光学情報記録用担体に関し、記録再生装置の光学
系や回路系の最適条件の設定を容易ならしめるよ
う構成したものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical information recording carrier for optically recording and reproducing information, and is configured to facilitate the setting of optimal conditions for the optical system and circuit system of a recording and reproducing device. be.
光学的に情報を記録再生する方式は、レーザ光
を微少な径（＜φ1μｍ）に絞つて、高速に大容量
の情報を記録することができるが、レーザスポツ
ト光を最適値に絞る光学系の調整および、記録再
生のレーザパワー、検出系のセンサのゲインを最
適に調整設定することが重要である。従来は、適
当な光学的情報記録用担体（デイスク）を用い、
これに信号を記録し、その信号を再生して、この
振巾を測定し、この振巾が最大になるように、光
学系を調整し、再び信号を記録し、その信号を再
生し、さらに、この振巾を測定し、この振巾が最
大になるように光学系を調整し、これらの記録、
再生、光学系調整のくりかえしで、最大の記録、
再生振巾が得られる光学系を定めていた。この方
法では、記録過程が必要であり、光学系に加えて
記録パワーの調整も必要となり、さらに調整用の
記録デイスクの性能の影響を考慮する必要があ
る。このため、調整の信頼性を上げることが困難
であり、又調整に時間がかかる等の問題点を有し
ている。 The method of optically recording and reproducing information can record a large amount of information at high speed by narrowing the laser beam to a small diameter (<φ1 μm), but it is difficult to use an optical system that narrows the laser spot beam to the optimum value. It is important to optimally adjust and set the laser power for recording and reproduction, and the gain of the sensor in the detection system. Conventionally, a suitable optical information recording carrier (disc) was used,
Record a signal on this, reproduce the signal, measure the amplitude, adjust the optical system so that this amplitude is maximized, record the signal again, reproduce the signal, and then , measure this amplitude, adjust the optical system so that this amplitude is maximum, and record these,
By repeating playback and optical system adjustment, you can achieve maximum recording,
An optical system that would provide the reproduction amplitude was determined. This method requires a recording process, requires adjustment of the recording power in addition to the optical system, and also requires consideration of the influence of the performance of the recording disk for adjustment. For this reason, it is difficult to improve the reliability of adjustment, and there are other problems such as the adjustment takes time.
本発明は、記録過程を必要としない調整法を可
能にする情報記録担体を提供するものである。こ
れは、記録デイスク内に設けた光学系調整用の凹
凸ピツトを利用することによつて実施できる。本
発明の情報記録担体では、光学系調整用のトラツ
クおよび、記録再生用のトラツクを具備してお
り、これらトラツク上に、記録用薄膜が設けられ
ているため、それぞれの部分からの反射光量は同
じになり、フオーカスおよび、トラツキング特性
はいずれのトラツクに対しても同等の性能を持た
せることができる。 The present invention provides an information record carrier that allows an adjustment method that does not require a recording process. This can be carried out by using uneven pits for optical system adjustment provided within the recording disk. The information recording carrier of the present invention is equipped with a track for adjusting the optical system and a track for recording and reproducing, and since a recording thin film is provided on these tracks, the amount of light reflected from each part is reduced. Therefore, the focus and tracking characteristics can be made to have the same performance for any track.
調整のステツプは次のようになる。まず、予じ
め設けられた光学系調整用のトラツクにおいて、
凹凸ピツトによる再生信号振巾が最大になるよう
に光学系を調整する。このことにより、光学系
は、その照射レーザスポツトを最小に絞る条件と
してもとめられる。 The adjustment steps are as follows. First, in the optical system adjustment track provided in advance,
The optical system is adjusted so that the reproduction signal amplitude due to the uneven pits is maximized. This allows the optical system to be conditioned to minimize the irradiation laser spot.
この結果、記録に対しても、最も適した光学系
として得られ、光学系の調整が迅速で、信頼性の
高いものとして定められる。 As a result, the optical system is most suitable for recording, and the optical system can be adjusted quickly and is highly reliable.
つぎに、スポツトの形状の調整をおこなう。例
えば、半導体レーザを光源として用いる場合は、
発光面の形状が長方形の場合、その非対称性によ
り、収束スポツトの形状はシリンドリカルレンズ
の調整により縦長あるいは横長の形状にすること
ができる。 Next, adjust the shape of the spot. For example, when using a semiconductor laser as a light source,
When the shape of the light emitting surface is rectangular, due to its asymmetry, the shape of the convergence spot can be made vertically or horizontally long by adjusting the cylindrical lens.
その結果、縦長つまり、トラツクと平行な方向
にスポツトが長いときは、隣のトラツクとのクロ
ストークは減少するが、記録の周波数特性が低下
しやすく、又、逆に横長つまりトラツクと直交す
る方向にスポツトが長いときは、クロストークに
関しては、増大しやすいが、特の向上がはかれ
る。このため、光学系調整用のトラツクの凹凸ピ
ツト信号として相隣るトラツクに、異る周波数の
信号を入れておくことにより、再生信号のクロス
トークを測定することができ、これを調整するこ
とができる。又、凹凸ピツト信号として、高い周
波数の信号を入れておくことにより、周波数特性
を測定することができ、これらの測定と調整によ
り、スポツト形状の調整が可能になる。 As a result, when the spot is vertically long, that is, long in the direction parallel to the track, crosstalk with adjacent tracks is reduced, but the recording frequency characteristics tend to deteriorate; When the spot is long, crosstalk tends to increase, but a particular improvement can be achieved. Therefore, by inserting signals of different frequencies into adjacent tracks as unevenness pit signals for optical system adjustment tracks, it is possible to measure the crosstalk of the reproduced signal, and this can be adjusted. can. Furthermore, by inputting a high frequency signal as the uneven pit signal, the frequency characteristics can be measured, and by these measurements and adjustments, the spot shape can be adjusted.
このスポツト径d2と、凹凸ピツトあるいは溝ト
ラツクの巾d1との関係は、d1＜d2に選ぶ必要があ
る。溝あるいは、凹凸ピツト部からの反射光は、
これらの深さから生ずる位相差による干渉、回折
光として検出する必要がある。スポツト径が、溝
あるいは凹凸ピツトの巾より大きいときにはじめ
て、トラツク上面と下面の間に、反射光の位相差
が生じ、反射光は変調を受け、信号として検出再
生がおこなえる。 The relationship between this spot diameter d 2 and the width d 1 of the uneven pit or groove track must be selected such that d 1 <d 2 . The reflected light from the grooves or pits is
It is necessary to detect interference and diffracted light due to phase differences caused by these depths. Only when the spot diameter is larger than the width of the groove or pit, a phase difference occurs in the reflected light between the top and bottom surfaces of the track, the reflected light is modulated, and detection and reproduction can be performed as a signal.
この深さがλ／4n（ただしｎは基材の屈折率）
の場合は、反射光は干渉により打ち消しあつて最
大の変調度が得られるが、記録トラツクの溝深さ
としては、無反射状態になり、記録信号の再生は
困難になる。この深さがλ／8nのときは変調度
は低くなるが、記録信号の検出再生が可能にな
り、次の場合が可能である。記録溝トラツクおよ
び、光学系調整用凹凸ピツトの深さをλ／8nに
する場合または、記録溝トラツクλ／8nとし、
光学系調整用凹凸ピツトの深さをλ／4nにする
場合である。 This depth is λ/4n (where n is the refractive index of the base material)
In this case, the reflected light is canceled by interference and the maximum degree of modulation is obtained, but the groove depth of the recording track is such that there is no reflection, making it difficult to reproduce the recorded signal. When this depth is λ/8n, the degree of modulation becomes low, but the recording signal can be detected and reproduced, and the following case is possible. When the depth of the recording groove track and the uneven pit for optical system adjustment is set to λ/8n, or when the recording groove track is set to λ/8n,
This is a case where the depth of the uneven pit for adjusting the optical system is set to λ/4n.
第１図ａは、本発明の１実施例における光学情
報記録用担体の平面図である。同図ｂは、光学系
調整用の凹凸ピツト信号部の拡大図であり、相隣
るトラツクに周波数1，2，3の信号が入つてい
る。凹凸ピツト信号部１，２のトラツク列が、デ
イスクの最内周部および、最外周部に設けられて
いる。情報の記録再生部３は、これら凹凸ピツト
信号部１および２に囲まれたデイスク中周部に設
けられている。情報記録用の薄膜は、これら光学
系調整用の凹凸ピツト信号部１，２および記録再
生部３の全域にわたつて蒸着形成されている。こ
れらの基板は、透明アクリルからなり、この上に
前記凹凸ピツト信号部１，２からなるトラツクが
設けられている。凹凸ピツト信号部１，２の凹凸
ピツト信号の巾d1は、照射レーザスポツト光の径
をd2として、d1＜d2になるように選ぶ、波長λ＝
830nmのレーザ光を用いレンズのNAを0.50に選
んだ場合、凹凸ピツト信号の巾d10.70μに定め
る。 FIG. 1a is a plan view of an optical information recording carrier in one embodiment of the present invention. FIG. 2B is an enlarged view of the concavo-convex pit signal section for adjusting the optical system, and signals of frequencies 1 , 2 , and 3 are included in adjacent tracks. Track rows of concavo-convex pit signal sections 1 and 2 are provided at the innermost and outermost peripheries of the disk. The information recording and reproducing section 3 is provided at the middle circumference of the disk surrounded by the concave and convex pit signal sections 1 and 2. A thin film for information recording is formed by vapor deposition over the entire area of the uneven pit signal sections 1 and 2 and the recording/reproducing section 3 for adjusting the optical system. These substrates are made of transparent acrylic, and tracks consisting of the uneven pit signal sections 1 and 2 are provided thereon. The width d 1 of the uneven pit signals of the uneven pit signal parts 1 and 2 is selected so that d 1 < d 2 , where the diameter of the irradiated laser spot light is d 2 , and the wavelength λ=
When using a laser beam of 830 nm and selecting a lens NA of 0.50, the width d 1 of the uneven pit signal is set to 0.70 μ.
記録用薄膜としては、例えば低酸化物薄膜
TeOx（Ｏ＜ｘ＜2.0）を主成分とする材料を適用
する。 As a recording thin film, for example, a low oxide thin film
A material whose main component is TeOx (O<x<2.0) is applied.
第２図は、第１図の要部拡大図であり、デイス
クの凹凸ピツト信号部および、記録再生用の溝ト
ラツク部の形状を示すものである。記録再生用の
溝トラツクは、４であり記録および再生用のレー
ザスポツト光９は、図の上部より照射する。光学
系調整用の凹凸ピツト信号を形成したトラツクは
５に示す。凹凸ピツト信号は６で示す。記録用薄
膜は７の斜線部の層であり、これは、記録再生部
および光学系調整用トラツク部の両者に形成する
ものである。この記録再生部への記録信号像は８
で示すものであり、黒化状態になつて、反射率が
周囲に対して増大あるいは、減少した状態として
得られる。 FIG. 2 is an enlarged view of the main part of FIG. 1, showing the shapes of the concavo-convex pit signal portion of the disk and the groove track portion for recording and reproduction. The groove track for recording and reproduction is numbered 4, and the laser spot light 9 for recording and reproduction is irradiated from the upper part of the figure. The track on which the uneven pit signal for adjusting the optical system was formed is shown in 5. The uneven pit signal is indicated by 6. The recording thin film is the shaded layer 7, which is formed on both the recording/reproducing section and the optical system adjustment track section. The recording signal image to this recording/reproducing section is 8
It is obtained as a blackened state in which the reflectance increases or decreases relative to the surroundings.
この記録再生溝部の深さは、再生光の波長λと
し、溝基材の屈折率をｎとおいて、λ／8nとお
く、樹脂層としてアクリル（PMMA）を用いる
場合は、ｎ＝1.50，λ＝830nｍとして、λ／8n＝
700Åとなる。この溝のはたらきは、凹凸変形を
伴わない記録用薄膜について、レーザスポツト光
のトラツキングの検出信号になる反射回折光を生
ずることである。この深さがλ／4nになると記
録トラツクからの反射光が減少し信号検出が困難
になる。又、光学系調整用の凹凸ピツト信号部の
深さとしては、λ／4nおよびλ／8nのいずれの
場合も考えることができる。凹凸ピツト信号部の
深さがλ／4nの場合は、この凹凸ピツト信号部
による反射光が最低になり未記録部の反射率との
差が大きくなり、信号再生が容易である。これに
対して、この凹凸ピツト信号部の深さがλ／8n
の場合は一部反射光が生じ、溝部からの反射光と
同程度になる。いずれの場合も、光学系調整用の
凹凸ピツト信号トラツクによる反射検出光は変調
を受け、その信号を再生する機能を有する。記録
再生用の溝トラツクの再生は、上記と同一条件で
行うことができ、再生に対する最適条件で、記録
再生の条件を定めることができる。 The depth of this recording/reproducing groove is set to λ/8n, where the wavelength of the reproducing light is λ and the refractive index of the groove base material is n. When acrylic (PMMA) is used as the resin layer, n=1.50, λ =830nm, λ/8n=
It becomes 700Å. The function of these grooves is to generate reflected diffraction light that becomes a detection signal for tracking of laser spot light in a recording thin film that is not accompanied by uneven deformation. When this depth becomes λ/4n, the reflected light from the recording track decreases, making signal detection difficult. Furthermore, the depth of the concave-convex pit signal portion for adjusting the optical system may be either λ/4n or λ/8n. When the depth of the concave-convex pit signal portion is λ/4n, the reflected light from the concave-convex pit signal portion becomes the lowest, and the difference from the reflectance of the unrecorded portion becomes large, making signal reproduction easy. On the other hand, the depth of this uneven pit signal part is λ/8n
In the case of , some reflected light occurs and is of the same level as the reflected light from the groove. In either case, the detection light reflected by the uneven pit signal track for adjusting the optical system is modulated and has a function of reproducing the signal. Reproduction of the groove track for recording and reproduction can be performed under the same conditions as described above, and the recording and reproduction conditions can be determined based on the optimum conditions for reproduction.
これらの光学系調整用の凹凸ピツト信号のトラ
ツクを具備する記録再生デイスクを適用した場合
の装置側の光学系、回路系の設定は次の手順によ
る。まず第１に、フオーカシングの調整をおこな
う。フオーカシングの位置をセンサの位置をかえ
ることにより変化させてゆき、凹凸ピツトの再生
光による検出信号振巾が最大になる点を選べば良
い。つぎに、レーザレンズヘツドのトラツクに対
する対称性のセツテイングをおこなう。これは、
光学系調整用トラツクの中で、トラツクの左右の
クロストークを測定し、調整することでおこなえ
る。 When a recording/reproducing disk equipped with a track of concavo-convex pit signals for adjusting the optical system is used, the optical system and circuit system on the apparatus side are set according to the following procedure. First of all, adjust the focusing. The focusing position may be changed by changing the position of the sensor, and the point at which the amplitude of the detection signal from the reproducing light of the concavo-convex pits is maximized may be selected. Next, the symmetry of the laser lens head with respect to the track is set. this is,
This can be done by measuring and adjusting the crosstalk between the left and right sides of the optical system adjustment track.
このようにして、光学系調整用の凹凸ピツト信
号を形成したトラツク部の検出信号が最大になる
フオーカス位置およびクロストークが、そのトラ
ツクの左右で対称になる位置、およびデイスク内
周部における光学系調整用の凹凸ピツト信号を形
成したトラツクからの再生の周波数特性のもつと
も良好なフオーカス位置をもとめ、これを記録再
生における光学系の最適条件と定める。以上の方
法は、本発明においては、光学系調整用および記
録再生部において同一膜厚の記録膜を形成してい
て、これからの光反射率が同じであることから、
フオーカス、トラツキングサーボの特性が両部分
で同等であるため、精度良く設定がおこなえる。 In this way, the focus position where the detection signal of the track portion where the uneven pit signal for optical system adjustment is formed is maximized, and the position where crosstalk is symmetrical on the left and right sides of the track, and the optical system at the inner circumference of the disk. A focus position with the best frequency characteristics for reproduction from the track on which the uneven pit signal for adjustment has been formed is determined, and this is determined as the optimum condition for the optical system in recording and reproduction. In the above method, in the present invention, recording films of the same thickness are formed in the optical system adjustment and recording/reproducing sections, and the light reflectance from this point on is the same.
Since the focus and tracking servo characteristics are the same in both parts, settings can be made with high precision.
この条件で、記録部に信号を記録すれば最も大
きい振巾として信号を得ることができる。 If a signal is recorded on the recording section under this condition, a signal with the largest amplitude can be obtained.
また、デイスクの最内周部および、最外周部に
光学系調整用の凹凸ピツト信号部を設けることに
より、光学系の調整を最内周部、最外周部にて順
次実施することにより、粗調整、微調整の調整を
行なうことが出来る。 In addition, by providing uneven pit signal sections for optical system adjustment on the innermost and outermost peripheries of the disk, the optical system can be adjusted sequentially from the innermost periphery and the outermost periphery. Adjustments and fine adjustments can be made.
以上のように本発明によれば、基板に半導体レ
ーザのスポツトより幅が小なる凹凸ピツトからな
り、隣接トラツク間で相異る周波数の信号を有す
る光学系調整用トラツク部と、記録再生の溝トラ
ツク部を設け、これらの上に半導体レーザのスポ
ツト照射により屈折率の変化する記録用薄膜を形
成したもので、これにより、スポツト形状が非等
方的な半導体レーザを光学系調整用トラツク部に
照射し、凹凸ピツトからの再生振幅の最大となる
点を求めることにより焦点位置が検出でき、さら
に隣接するトラツク間で再生された信号の周波数
が異なるため、任意のトラツクの信号再生で隣り
のトラツクからのモレ信号、即ちクロストークの
大きさも検出でき、記録再生の光学系の調整が迅
速かつ正確にでき、さらに収束スポツト光の形状
調整を迅速に行うことができ、クロストークのな
い周波数特性の優れた光学系の調整ができる。 As described above, according to the present invention, there is provided an optical system adjustment track section which is made up of concave and convex pits having a width smaller than a semiconductor laser spot on a substrate, and which has signals of different frequencies between adjacent tracks, and a recording/reproducing groove. A track section is provided, and a recording thin film whose refractive index changes by spot irradiation with a semiconductor laser is formed on these.This allows the semiconductor laser, which has an anisotropic spot shape, to be used as a track section for adjusting the optical system. The focal point position can be detected by irradiating the track and finding the point where the reproduction amplitude from the uneven pit is maximum.Furthermore, since the frequency of the reproduced signal differs between adjacent tracks, signal reproduction of any track can detect the position of the adjacent track. It is also possible to detect leakage signals, that is, the magnitude of crosstalk, allowing for quick and accurate adjustment of the optical system for recording and playback.Furthermore, it is possible to quickly adjust the shape of the convergent spot light, and to achieve frequency characteristics without crosstalk. Excellent optical system adjustment possible.
さらに、記録用薄膜により再生調整後、リアル
タイムで記録確認が行える。また、情報記録担体
毎に、微調整をおこなうことができ、調整が正
確、迅速に実施できるものである。 Furthermore, the recording thin film allows for real-time recording confirmation after playback adjustment. Furthermore, fine adjustments can be made for each information recording carrier, and adjustments can be made accurately and quickly.
第１図ａは本発明の１実施例における光学情報
記録用担体の平面図、ｂは同要部の拡大平面図、
第２図は同要部の一部切欠斜視図である。
１，２……凹凸ピツト信号部、３……記録再生
部、４……記録再生用の溝トラツク部、５……光
学系調整用トラツク部、６……凹凸ピツト信号、
７……記録用薄膜、８……記録ピツト。
FIG. 1a is a plan view of an optical information recording carrier according to an embodiment of the present invention, and FIG. 1b is an enlarged plan view of the essential parts.
FIG. 2 is a partially cutaway perspective view of the main part. DESCRIPTION OF SYMBOLS 1, 2... Concave/convex pit signal section, 3... Recording and reproducing section, 4... Groove track section for recording and reproducing, 5... Optical system adjustment track section, 6... Concave and convex pit signal,
7... Thin film for recording, 8... Recording pit.
Claims (1)
る凹凸ピツトからなり、隣接トラツク間で相異る
周波数の信号を有する光学系調整用トラツク部と
記録再生の溝トラツク部とを設け、前記光学系調
整用トラツク部と記録再生の溝トラツク部との表
面に半導体レーザのスポツト照射により屈折率の
変化する記録用薄膜を形成した光学情報記録用担
体。1. An optical system adjustment track section and a recording/reproducing groove track section are provided on the substrate, which are composed of uneven pits having a width smaller than a semiconductor laser spot, and have signals of different frequencies between adjacent tracks, and the optical system adjustment An optical information recording carrier comprising a recording thin film whose refractive index changes by spot irradiation with a semiconductor laser on the surfaces of a recording and reproducing groove track section and a recording/reproducing groove track section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56199269A JPS58100249A (en) | 1981-12-09 | 1981-12-09 | Carrier for optical information recording |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56199269A JPS58100249A (en) | 1981-12-09 | 1981-12-09 | Carrier for optical information recording |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58100249A JPS58100249A (en) | 1983-06-14 |
| JPH0127494B2 true JPH0127494B2 (en) | 1989-05-29 |
Family
ID=16404972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56199269A Granted JPS58100249A (en) | 1981-12-09 | 1981-12-09 | Carrier for optical information recording |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58100249A (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6050733A (en) * | 1983-08-31 | 1985-03-20 | Sony Corp | Optical recording medium and producer of master disk of said medium |
| JPH07107744B2 (en) * | 1984-05-16 | 1995-11-15 | 松下電器産業株式会社 | Optical disc playback method |
| JPS61172233A (en) * | 1985-01-25 | 1986-08-02 | Nec Corp | Substrate for optical disk |
| JPS63157319A (en) * | 1986-12-19 | 1988-06-30 | Matsushita Electric Ind Co Ltd | Optical disk |
| JPH01107321A (en) * | 1987-10-20 | 1989-04-25 | Matsushita Electric Ind Co Ltd | Optical disk |
| JP2687850B2 (en) * | 1993-09-27 | 1997-12-08 | 株式会社日立製作所 | Information processing device |
| JP2611681B2 (en) * | 1994-12-19 | 1997-05-21 | ソニー株式会社 | Optical recording medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5046317A (en) * | 1973-08-29 | 1975-04-25 | ||
| JPS5265404A (en) * | 1975-11-26 | 1977-05-30 | Matsushita Electric Ind Co Ltd | Information recording original disk being furnished with pattern for d etecting focus position |
-
1981
- 1981-12-09 JP JP56199269A patent/JPS58100249A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5046317A (en) * | 1973-08-29 | 1975-04-25 | ||
| JPS5265404A (en) * | 1975-11-26 | 1977-05-30 | Matsushita Electric Ind Co Ltd | Information recording original disk being furnished with pattern for d etecting focus position |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58100249A (en) | 1983-06-14 |
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