JPH08287466A - Recording/reproducing device for rewritable optical information recording medium - Google Patents
Recording/reproducing device for rewritable optical information recording mediumInfo
- Publication number
- JPH08287466A JPH08287466A JP9338495A JP9338495A JPH08287466A JP H08287466 A JPH08287466 A JP H08287466A JP 9338495 A JP9338495 A JP 9338495A JP 9338495 A JP9338495 A JP 9338495A JP H08287466 A JPH08287466 A JP H08287466A
- Authority
- JP
- Japan
- Prior art keywords
- information
- laser light
- recording medium
- light
- rewritable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
Description
【0001】[0001]
【産業上の利用分野】本発明は、書換型光情報記録媒体
の再生記録装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproducing / recording device for a rewritable optical information recording medium.
【0002】[0002]
【従来の技術】近年、書換型の情報記録媒体としてレー
ザ光照射による記録膜の相転移を利用したものが提案さ
れている(例えば特開平5−205316号公報)。そ
の構造の一例を図6で説明すると、ポリカーボネイト等
の透明基板11上にTiO2 、ZnS−SiO2 等の光
干渉膜12A〜12Dを多層に積層し(本例では4
層)、これら光干渉膜12A〜12D上に、透明な下層
保護膜13を介してGeSbTe等の記録膜14を形成
する。記録膜14上には透明な上層保護膜15を介して
Au等の反射膜16を形成する。2. Description of the Related Art Recently, as a rewritable information recording medium, one using a phase transition of a recording film by laser light irradiation has been proposed (for example, JP-A-5-205316). An example of the structure will be described with reference to FIG. 6. Optical interference films 12A to 12D such as TiO2 and ZnS-SiO2 are laminated in multiple layers on a transparent substrate 11 such as polycarbonate (4 in this example).
Layer), and a recording film 14 of GeSbTe or the like is formed on these optical interference films 12A to 12D with a transparent lower protective film 13 interposed therebetween. A reflective film 16 of Au or the like is formed on the recording film 14 via a transparent upper protective film 15.
【0003】前記基板11の下方から強いレーザ光を短
時間照射すると、記録膜14の照射部は高温溶融後急冷
して非晶質となり、中程度のレーザ光をやや長い時間照
射すると、上記照射部は加熱後徐冷されて結晶質とな
る。これら非晶質相と結晶質相はレーザ光照射側から見
た反射率が異なるから、二値情報に応じて非晶質相と結
晶質相を適宜記録膜14上に形成してこれに弱いレーザ
光を照射し、その反射光量を検出すれば、記録膜14に
記録された情報を読み取ることができる。When a strong laser beam is radiated from below the substrate 11 for a short time, the irradiated portion of the recording film 14 is melted at a high temperature and then rapidly cooled to become amorphous. When a medium laser beam is radiated for a rather long time, the above-mentioned irradiation is performed. After heating, the part is gradually cooled and becomes crystalline. Since the amorphous phase and the crystalline phase have different reflectances when viewed from the laser light irradiation side, the amorphous phase and the crystalline phase are appropriately formed on the recording film 14 according to the binary information, and are weak to this. The information recorded on the recording film 14 can be read by irradiating the laser beam and detecting the reflected light amount.
【0004】なお、記録膜14上に新たな情報を書き込
む場合には、いわゆるオーバライトをするか、全てを非
晶質相あるいは結晶質相として情報消去状態とした後、
再書込みを行う。ところで、このような書換型光情報記
録媒体1に情報を記録する場合、記録膜14の光吸収率
が大きいほど、すなわち光反射率が小さいほど、記録時
のレーザ光パワーは小さくできる。一方、上記光情報記
録媒体1から情報を読み出す場合には、記録膜14の光
反射率が大きいほど照射光の反射が効率的になされるか
ら、再生時のレーザ光パワーを小さくできる。特に、C
D等の再生専用型記録媒体や追記型の記録媒体では再生
時のレーザ光パワーを小さくすべく、記録媒体の光反射
率が高く設定されている。In the case of writing new information on the recording film 14, so-called overwriting is performed, or after all of the amorphous phase or the crystalline phase is set to the information erasing state,
Rewrite. By the way, when information is recorded on such a rewritable optical information recording medium 1, the laser light power at the time of recording can be made smaller as the light absorption rate of the recording film 14 is larger, that is, the light reflectance is smaller. On the other hand, when reading information from the optical information recording medium 1, the greater the light reflectance of the recording film 14 is, the more efficiently the irradiation light is reflected, so that the laser light power during reproduction can be reduced. In particular, C
In a read-only recording medium such as D and a write-once recording medium, the light reflectance of the recording medium is set high in order to reduce the laser light power during reproduction.
【0005】そこで、書換型光情報記録媒体1では、前
述したように所定の膜厚に設定した複数の光干渉膜12
A〜12Dを前記記録膜と共に形成し、さらに、再生時
と書込み時とで異なる波長のレーザ光を使用することに
より、上記二律背反的な要請に応えている。これを図7
で説明する。図において、線xは前記結晶質相の光反射
率の波長依存性を示し、また、線yは非晶質相の光反射
率の波長依存性を示す。図から判るように、記録用レー
ザ光の波長λ1 では、結晶質相と非晶質相の光反射率
は、互いにある程度の差を有しつつ、いずれも小さい。
これに対して、再生用レーザ光の波長λ2 では、結晶質
相と非晶質相の光反射率は比較的大きな差を有しつつ、
いずれも大きい。Therefore, in the rewritable optical information recording medium 1, a plurality of optical interference films 12 set to have a predetermined film thickness as described above.
By forming A to 12D together with the recording film and using laser light having different wavelengths during reproduction and writing, the above-mentioned trade-off requirement is met. This is shown in FIG.
Described in. In the figure, the line x shows the wavelength dependence of the light reflectance of the crystalline phase, and the line y shows the wavelength dependence of the light reflectance of the amorphous phase. As can be seen from the figure, at the wavelength λ 1 of the recording laser light, the optical reflectivities of the crystalline phase and the amorphous phase have some differences, but are small.
On the other hand, at the wavelength λ2 of the reproducing laser light, the light reflectances of the crystalline phase and the amorphous phase have a relatively large difference,
Both are large.
【0006】図中、線x´は再生専用型ないし追記型記
録媒体のミラー部分の反射率であり、その波長依存性は
殆ど無い。そこで、波長λ2 での結晶質相の光反射率
が、図示するように、再生専用型等のミラー部分の反射
率と同程度になるように上記光干渉膜の積層数および膜
厚等を考慮すれば、書換型光情報記録媒体の記録再生装
置で再生専用型記録媒体の再生が可能となる。In the figure, the line x'represents the reflectance of the mirror portion of the read-only or write-once recording medium, which has almost no wavelength dependence. Therefore, consider the number of stacked optical interference films and the film thickness so that the light reflectance of the crystalline phase at the wavelength λ2 is approximately the same as the reflectance of the mirror portion of the read-only type as shown in the figure. Then, it becomes possible to reproduce the read-only recording medium with the recording / reproducing apparatus for the rewritable optical information recording medium.
【0007】ところが、光情報記録媒体への情報記録お
よび情報再生に、上述の如く、出力波長の異なる二種の
レーザダイオードを設けると、記録再生ヘッドの体格が
大きくなるとともに、フォーカスやトラッキング制御の
機構が複雑化する。また、記録媒体の構造も、図7の二
波長λ1 、λ2 域で所定の光反射率を得るようにするた
めに、図6の光干渉膜12A〜12Dの積層数が増える
等により複雑化する。However, if two types of laser diodes having different output wavelengths are provided for recording and reproducing information on the optical information recording medium, the physical size of the recording / reproducing head becomes large and focus and tracking control are performed. The mechanism becomes complicated. Further, the structure of the recording medium is also complicated by increasing the number of stacked optical interference films 12A to 12D in FIG. 6 in order to obtain a predetermined light reflectance in the two wavelengths λ1 and λ2 regions of FIG. .
【0008】そこで、例えば特開平3−212830号
公報には、光反射率を大きくした上記波長λ2 におい
て、レーザ光パワーを十分大きくすることにより、この
波長λ2 での書換型光情報記録媒体への再書き込みを可
能として、記録、再生用レーザダイオードの単一化を図
ったものが提案されている。Therefore, for example, in Japanese Unexamined Patent Publication No. 3-212830, the rewritable optical information recording medium at the wavelength λ2 is changed to a sufficiently large laser light power at the wavelength λ2 where the light reflectance is increased. It has been proposed that recording / reproducing laser diodes are unified so that rewriting is possible.
【0009】[0009]
【発明が解決しようとする課題】しかし、上記提案の装
置では、光反射率を高くした状態での書換型光情報記録
媒体への再書き込みに要するレーザ光パワーが非常に大
きなものとなるため、電力消費の増大が問題となる。本
発明はこのような課題を解決するもので、光学ヘッドの
必要以上の大型化と電力消費の増大を抑えつつ、再生専
用型記録媒体等の再生をも可能とした、書換型光情報記
録媒体の記録再生装置を提供することを目的とする。However, in the above-mentioned proposed apparatus, the laser light power required for rewriting to the rewritable optical information recording medium in the state where the light reflectance is high becomes very large. Increased power consumption becomes a problem. The present invention solves such a problem, and is a rewritable optical information recording medium capable of reproducing a read-only recording medium while suppressing an unnecessarily large-sized optical head and an increase in power consumption. It is an object of the present invention to provide a recording / reproducing device of
【0010】[0010]
【課題を解決するための手段】本発明は上記目的を達成
するため、請求項1に記載の発明においては、記録再生
装置は、書換型光情報記録媒体に対して、情報記録時に
は相対的に強い強度範囲のレーザ光を記録情報に応じて
強弱照射するとともに、情報再生時には相対的に弱い強
度範囲のレーザ光を照射するレーザ光照射手段と、情報
再生時に、照射された前記レーザ光の反射光を入力して
その強度に応じた出力信号を発する受光手段と、前記出
力信号のに応じて前記受光手段の増幅率を変更する増幅
率変更手段と、前記受光手段の出力信号より前記記録情
報を得る情報入手手段と、を備えている。In order to achieve the above-mentioned object, the present invention provides a recording / reproducing apparatus in which the recording / reproducing apparatus is relatively arranged with respect to a rewritable optical information recording medium at the time of recording information. Laser light irradiating means for irradiating the laser light in the strong intensity range according to the recorded information, and for irradiating the laser light in the relatively weak intensity range during information reproduction, and the reflection of the laser light irradiated during information reproduction Light receiving means for inputting light and emitting an output signal according to its intensity, amplification factor changing means for changing the amplification factor of the light receiving means according to the output signal, and the recording information from the output signal of the light receiving means. And means for obtaining information.
【0011】請求項2に記載の発明においては、記録再
生装置は、書換型光情報記録媒体に対して、情報記録時
には相対的に強い強度範囲のレーザ光を記録情報に応じ
て強弱照射するとともに、情報再生時には相対的に弱い
強度範囲のレーザ光を照射するレーザ光照射手段と、情
報再生時に、照射された前記レーザ光の反射光を入力し
てその強度に応じた出力信号を発する受光手段と、前記
出力信号のレベルに応じて前記レーザ光照射手段からの
照射レーザ光の強度を変更するレーサ光強度変更手段
と、前記受光手段の出力信号より前記記録情報を得る情
報入手手段と、を備えている。According to the second aspect of the invention, the recording / reproducing apparatus irradiates the rewritable optical information recording medium with a laser beam in a relatively high intensity range according to the record information while recording the information. A laser light irradiating means for irradiating a laser light in a relatively weak intensity range at the time of reproducing information, and a light receiving means for receiving a reflected light of the irradiated laser light at the time of reproducing information and emitting an output signal corresponding to the intensity thereof. A laser light intensity changing means for changing the intensity of the laser light emitted from the laser light emitting means according to the level of the output signal, and an information obtaining means for obtaining the recording information from the output signal of the light receiving means. I have it.
【0012】請求項3に記載の発明においては、記録再
生装置は、書換型光情報記録媒体に対して、情報記録時
には相対的に強い強度範囲のレーザ光を二値情報に応じ
て強弱照射するとともに、情報再生時には相対的に弱い
強度範囲のレーザ光を照射するレーザ光照射手段(2、
4)と、情報再生時に、照射された前記レーザ光の反射
光を入力してその強度に応じた出力を発する受光手段
(2、61)と、該受光手段(2、61)の出力より上
記記録情報を得る情報入手手段(66)と、情報再生さ
れる光情報記録媒体の種類を識別する識別情報を読み取
る読取手段(64、65)と、読み取った識別情報が書
換型か非書換型かにより前記受光手段(2、61)の増
幅率を変更する増幅率変更手段(7)とを備えている。According to the third aspect of the invention, the recording / reproducing apparatus irradiates the rewritable optical information recording medium with a laser beam in a relatively high intensity range according to the binary information when the information is recorded. At the same time, a laser light irradiation means (2,
4), the light receiving means (2, 61) for receiving the reflected light of the irradiated laser light and emitting an output according to the intensity thereof at the time of information reproduction, and the output from the light receiving means (2, 61). Information obtaining means (66) for obtaining recorded information, reading means (64, 65) for reading identification information for identifying the type of the optical information recording medium from which information is reproduced, and whether the read identification information is rewritable or non-rewritable And an amplification factor changing unit (7) for changing the amplification factor of the light receiving unit (2, 61).
【0013】請求項4に記載の発明においては、記録再
生装置は、書換型光情報記録媒体に対して、情報記録時
には相対的に強い強度範囲のレーザ光を記録情報に応じ
て強弱照射するとともに、情報再生時には相対的に弱い
強度範囲のレーザ光を照射するレーザ光照射手段と、情
報再生時に、照射された前記レーザ光の反射光を入力し
てその強度に応じた出力を発する受光手段と、該受光手
段の出力より前記記録情報を得る情報入手手段と、情報
再生される光情報記録媒体の種類を識別する識別情報を
読み取る読取手段と、読み取った前記識別情報が書換型
か非書換型かにより前記レーザ光照射手段からの照射レ
ーザ光の強度を変更するレーザ光強度変更手段とを備え
ている。According to another aspect of the present invention, the recording / reproducing apparatus irradiates the rewritable optical information recording medium with a laser beam in a relatively strong intensity range according to the recorded information. A laser light irradiating means for irradiating a laser light in a relatively weak intensity range during information reproduction, and a light receiving means for receiving reflected light of the irradiated laser light during information reproduction and emitting an output according to the intensity thereof. An information acquisition means for obtaining the recorded information from the output of the light receiving means, a reading means for reading identification information for identifying the type of the optical information recording medium on which information is reproduced, and a read-type or non-rewritable type of the read identification information. And a laser beam intensity changing unit for changing the intensity of the laser beam emitted from the laser beam emitting unit.
【0014】請求項5に記載の発明においては、上記レ
ーザ光照射手段は、情報記録時と情報再生時とで同一波
長のレーザ光を照射するものである。請求項6に記載の
発明においては、書換型光情報記録媒体(1)は、レー
ザ光を相対的に強い強度範囲で記録情報に応じて記録層
に強弱照射することにより、相対的に弱い強度範囲でレ
ーザ光を照射した時の反射率が相違する結晶質相と非晶
質相を前記記録層に形成して記録情報の記録をなすもの
であって、媒体基板(11)の一部に書換型と非書換型
の種類を識別する識別情報を、前記結晶質相と非晶質相
の間の相転移以外の方法で記録してある。According to a fifth aspect of the present invention, the laser light irradiating means irradiates laser light of the same wavelength during information recording and during information reproduction. In the invention of claim 6, the rewritable optical information recording medium (1) irradiates the recording layer with strong and weak laser light in a relatively strong intensity range in accordance with the recorded information, whereby the relatively weak intensity. A crystalline phase and an amorphous phase, which have different reflectances when irradiated with laser light in a range, are formed in the recording layer to record recorded information, and the recorded information is recorded on a part of the medium substrate (11). Identification information for discriminating between the rewritable type and the non-rewritable type is recorded by a method other than the phase transition between the crystalline phase and the amorphous phase.
【0015】請求項7に記載の発明においては、書換型
光情報記録媒体は、媒体基板(11)面の、記録情報を
記録する領域(11a)外に設けたマーク(12A,1
2B)に前記識別情報を記録する。なお、上記各手段の
カッコ内の符号は、後述する実施例記載の具体的手段と
の対応関係を示すものである。According to a seventh aspect of the present invention, in the rewritable optical information recording medium, the mark (12A, 1) provided on the surface of the medium substrate (11) outside the area (11a) for recording the recording information.
2B) records the identification information. The reference numerals in parentheses of the above-mentioned means indicate the correspondence with the concrete means described in the embodiments described later.
【0016】[0016]
【発明の作用効果】請求項1又は2に記載の記録再生装
置において、装置にセットされた光情報記録媒体が書換
型である場合には、その光吸収率が大きい、すなわち光
反射率が小さいから、受光手段からの出力信号レベルは
低い。したがって、この場合には出力信号レベルを最適
にすべく受光手段の増幅率が大きくされ、あるいはレー
ザ光照射手段からの照射レーザ光の強度が大きくされ
る。In the recording / reproducing apparatus according to claim 1 or 2, when the optical information recording medium set in the apparatus is a rewritable type, its light absorption rate is high, that is, its light reflectance is low. Therefore, the output signal level from the light receiving means is low. Therefore, in this case, the amplification factor of the light receiving means is increased or the intensity of the laser light emitted from the laser light emitting means is increased to optimize the output signal level.
【0017】反対に、装置にセットされた光情報記録媒
体が非書換型である場合には、光反射率が大きいから受
光手段からの出力信号レベルは高く、この場合には出力
信号レベルを最適にすべく受光手段の増幅率が小さくさ
れ、あるいはレーザ光照射手段からの照射レーザ光の強
度が小さくされる。このようにして、装置にセットされ
た光情報記録媒体が書換型、非書換型のいずれであって
も、これらに記録された情報を再生することができる。On the other hand, when the optical information recording medium set in the apparatus is a non-rewritable type, the output signal level from the light receiving means is high because the light reflectance is large. In this case, the output signal level is optimum. Therefore, the amplification factor of the light receiving means is reduced, or the intensity of the laser light emitted from the laser light emitting means is reduced. Thus, whether the optical information recording medium set in the apparatus is a rewritable type or a non-rewritable type, the information recorded in these can be reproduced.
【0018】本発明によれば、受光手段の増幅率、ある
いは、情報再生時のレーザ光照射手段からの照射レーザ
光の強度を変更するのみで、電力消費の大幅な増大を招
くことなく、書換型光情報記録媒体への信号記録および
信号再生、さらには非書換型光情報記録媒体の信号再生
を行うことができる。請求項6または7のに記載の書換
型光情報記録媒体を、請求項3または4に記載の記録再
生装置で再生する際に、前記読取手段により媒体上の識
別情報が読み取られ、識別情報が書換型か非書換型かに
より受光手段の増幅率が変更され、あるいはレーザ光照
射手段からの照射レーザ光の強度が変更される。According to the present invention, only by changing the amplification factor of the light receiving means or the intensity of the laser light emitted from the laser light emitting means at the time of reproducing information, rewriting can be performed without causing a significant increase in power consumption. It is possible to perform signal recording and signal reproduction on the type optical information recording medium and further signal reproduction for the non-rewritable type optical information recording medium. When the rewritable optical information recording medium according to claim 6 or 7 is reproduced by the recording / reproducing apparatus according to claim 3 or 4, the identification information on the medium is read by the reading means, and the identification information is The amplification factor of the light receiving means is changed or the intensity of the laser light emitted from the laser light emitting means is changed depending on whether the rewriting type or the non-rewriting type is used.
【0019】これにより、例えば、情報再生される光情
報記録媒体が書換型である場合には、その光吸収率が大
きい、すなわち光反射率が小さいから、前記受光手段の
増幅率が大きくされ、あるいは前記レーザ光照射手段か
らの照射レーザ光の強度が小さくされる。これに対し
て、情報再生される光情報記録媒体が非書換型である場
合には、その光反射率が大きいから、受光手段の増幅率
が小さくされ、あるいはレーザ光照射手段からの照射レ
ーザ光の強度が弱くされる。このようにして、書換型、
非書換型のいずれの光情報記録媒体に対しても、これら
に記録された記録情報を再生することができる。Thus, for example, when the optical information recording medium on which information is reproduced is a rewritable medium, its light absorption rate is large, that is, its light reflectance is small, so that the amplification factor of the light receiving means is increased, Alternatively, the intensity of the laser light emitted from the laser light emitting means is reduced. On the other hand, when the optical information recording medium on which information is reproduced is a non-rewritable type, its light reflectance is high, so that the amplification factor of the light receiving means is reduced, or the laser light emitted from the laser light emitting means The strength of is weakened. In this way, the rewrite type,
The recorded information recorded on any of the non-rewritable optical information recording media can be reproduced.
【0020】請求項5に記載の記録再生装置では、単一
波長のレーザ光で記録および再生を行うから、光学ヘッ
ドをコンパクトにすることができる。In the recording / reproducing apparatus according to the fifth aspect, recording and reproducing are performed with a laser beam having a single wavelength, so that the optical head can be made compact.
【0021】[0021]
【実施例】以下、本発明を図に示す実施例について説明
する。 (第1実施例)図1には本発明の第1実施例に係る記録
再生装置の概略全体構成を示す。装置にセットされた書
換型ないし非書換型の光情報記録媒体(光ディスク)1
は、回転モータ9により所定速度で回転駆動され、ディ
スク面に対向して位置する光学ヘッド2から射出するレ
ーザ光により既に従来技術で説明した方法で情報記録な
いし情報再生がなされる。なお、書換型光ディスクの構
造は既に説明した従来のもの(図6参照)と基本的に同
一である。Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 shows a schematic overall structure of a recording / reproducing apparatus according to a first embodiment of the present invention. Rewritable or non-rewritable optical information recording medium (optical disc) 1 set in the apparatus
Is rotationally driven at a predetermined speed by the rotary motor 9, and information recording or information reproduction is performed by the laser light emitted from the optical head 2 facing the disk surface by the method already described in the prior art. The structure of the rewritable optical disk is basically the same as the conventional one (see FIG. 6) already described.
【0022】光学ヘッド2内のレーザダイオード(図示
略)は、記録回路5あるいは再生回路6からの指令を受
けたレーザ駆動回路4により作動し、書換型の光ディス
ク(書換型CD)に対し光吸収率の大きい波長域で所定
波長(例えば図7のλ1 )のレーザ光を出力する。この
時のレーザ光強度は、情報記録時には、相対的に強い強
度範囲で二値情報に応じて強弱変化し、また、情報再生
時には、相対的に弱い強度範囲とされる。なお、記録時
のレーザ光強度は、書換型CDの光吸収率が高いことか
ら、それほど大きくする必要はなく、電力消費量は大幅
に低減される。A laser diode (not shown) in the optical head 2 is operated by the laser drive circuit 4 which receives a command from the recording circuit 5 or the reproducing circuit 6 and absorbs light to a rewritable optical disk (rewritable CD). Laser light of a predetermined wavelength (for example, .lambda.1 in FIG. 7) is output in a wavelength range with a high rate. The intensity of the laser beam at this time changes in intensity in a relatively strong intensity range according to the binary information at the time of recording information, and is set to a relatively weak intensity range at the time of reproducing information. Since the rewritable CD has a high light absorptance, the laser light intensity at the time of recording does not need to be so large, and the power consumption is greatly reduced.
【0023】上記光学ヘッド2はリニアモータ3により
光ディスク1の径方向へ移動させられる。再生時の光デ
ィスク1からの反射光は、光学ヘッド2内のフォトダイ
オードで受光されて、その出力信号が、詳細を後述する
再生回路6へ入力される。サーボ回路8が設けられて、
光学ヘッド2のフォーカス制御、リニアモータ3による
上記光学ヘッド2のトラッキング制御、あるいは回転モ
ータ9の回転数制御を行っている。また、再生回路6に
は、光ディスク1が書換型、再生専用型、追記型のいず
れであるかを識別する機能を有する制御回路7が接続さ
れている。The optical head 2 is moved by the linear motor 3 in the radial direction of the optical disc 1. The reflected light from the optical disc 1 at the time of reproduction is received by the photodiode in the optical head 2, and the output signal thereof is input to the reproduction circuit 6 whose details will be described later. Servo circuit 8 is provided,
Focus control of the optical head 2, tracking control of the optical head 2 by the linear motor 3, or rotation speed control of the rotary motor 9 is performed. Further, a control circuit 7 having a function of identifying whether the optical disc 1 is a rewritable type, a read-only type, or a write-once type is connected to the reproducing circuit 6.
【0024】再生回路6の詳細を図2に示す。光学ヘッ
ド2からの高周波出力信号は、ゲイン可変のプリアンプ
61に入力され、増幅された後、波形整形回路62とフ
ィルタ64へ入力する。上記回路62で矩形波に波形整
形された信号はデータストローブ回路63に入力し、こ
れに内蔵されたPLL回路により位相が修正され、外部
装置との信号同期がとられる。位相修正後の信号は信号
処理回路66にてエラーの訂正やサブコードの読み取り
等がなされ、インターフェース回路67を経て外部装置
へ出力される。The details of the reproducing circuit 6 are shown in FIG. The high frequency output signal from the optical head 2 is input to the gain variable preamplifier 61, amplified, and then input to the waveform shaping circuit 62 and the filter 64. The signal waveform-shaped into the rectangular wave by the circuit 62 is input to the data strobe circuit 63, the phase is corrected by the PLL circuit incorporated therein, and the signal is synchronized with the external device. The signal after the phase correction is subjected to error correction, subcode reading, etc. in the signal processing circuit 66, and is output to an external device via the interface circuit 67.
【0025】前記フィルタ64で抽出された信号はウォ
ブル信号復調回路65へ入力する。このウォブル信号復
調回路65はCLV(Constant Linear
Velocity)制御のためのものである。すなわ
ち、光ディスク1には通常、図3に示すように、基板1
1の表面に同心状あるいは渦巻状の案内溝(プリグルー
ブ)111が形成されて、トラッキング制御の用に供さ
れている。The signal extracted by the filter 64 is input to the wobble signal demodulation circuit 65. The wobble signal demodulation circuit 65 is a CLV (Constant Linear).
Velocity) control. That is, the optical disc 1 usually has a substrate 1 as shown in FIG.
A concentric or spiral guide groove (pre-groove) 111 is formed on the surface of No. 1 and is used for tracking control.
【0026】この案内溝111はさらに図示の如く左右
に周期的に蛇行(ウォブリング)しており、案内溝11
1に沿って移動する光学ヘッド2の出力信号にウォブリ
ングに伴う周波数成分(ウォブル信号)が現れる。そこ
で、このウォブル信号を所定の周波数(22.05KH
z)に維持するように回転モータ9の回転制御を行うこ
とにより線速を一定にし、等密度での情報記録と情報再
生を可能とする。The guide groove 111 is further meandering (wobbling) to the left and right periodically as shown in the drawing, and the guide groove 11
A frequency component (wobble signal) associated with wobbling appears in the output signal of the optical head 2 moving along 1. Therefore, this wobble signal is transmitted at a predetermined frequency (22.05 KH
By controlling the rotation of the rotary motor 9 so as to maintain z), the linear velocity can be made constant, and information recording and information reproduction can be performed at a uniform density.
【0027】本実施例ではCLV用の上記ウォブリング
に、FM変調によって、光ディスクが書換型、追記型、
再生専用型のいずれであるかを識別する識別情報、およ
びデータ位置を示す時間情報、情報記録時の線速、レー
ザパワー等を重畳してある。したがって、図2におい
て、復調回路65で復調されたウォブル信号は、CLV
制御のためにサーボ回路8へ入力するとともに、制御回
路7へも入力して光ディスクの型が識別される。In this embodiment, the optical disc is rewritable, write-once, or writable by FM modulation on the wobbling for CLV.
Identification information for identifying the reproduction-only type, time information indicating the data position, linear velocity at the time of recording information, laser power, and the like are superimposed. Therefore, in FIG. 2, the wobble signal demodulated by the demodulation circuit 65 is CLV.
In addition to being input to the servo circuit 8 for control, it is also input to the control circuit 7 to identify the type of the optical disk.
【0028】上記制御回路7の処理手順を図4のフロー
チャートで更に説明すると、制御回路7は最初にプリア
ンプ61のゲインを書換型CDの再生レベルに設定する
(ステップ101)。使用するレーザ光波長において書
換型CDの光反射率は既述の如く小さいから、上記ゲイ
ンは大きい値とされる。光学ヘッド2の出力はプリアン
プ61で増幅され、波形整形回路、データストローブ回
路、信号処理回路を経て制御回路7に入力する。制御回
路7は入力する信号レベルから信号再生が可能か否かを
判定する(ステップ102)。セットされている光情報
記録媒体が再生専用型(以下、単にCDという)あるい
は追記型である場合には、プリアンプ61のゲインが大
きいから制御回路7に入力する信号は飽和していること
が多い。そこで、この場合はプリアンプのゲインを小さ
くする(ステップ103)。The processing procedure of the control circuit 7 will be further described with reference to the flowchart of FIG. 4. The control circuit 7 first sets the gain of the preamplifier 61 to the reproduction level of the rewritable CD (step 101). Since the light reflectance of the rewritable CD is small at the laser light wavelength used, as described above, the gain is set to a large value. The output of the optical head 2 is amplified by the preamplifier 61 and input to the control circuit 7 via the waveform shaping circuit, the data strobe circuit, and the signal processing circuit. The control circuit 7 determines from the input signal level whether signal reproduction is possible (step 102). When the set optical information recording medium is a read-only type (hereinafter simply referred to as a CD) or a write-once type, the signal input to the control circuit 7 is often saturated because the gain of the preamplifier 61 is large. . Therefore, in this case, the gain of the preamplifier is reduced (step 103).
【0029】ステップ102で信号の再生が可能である
場合には、ステップ104で、復調回路65にて復調さ
れたウォブル信号を読み込み、続くステップ105でC
D、追記型CD、書換型CDを識別する。そして、後二
者の場合には、ステップ106、107で、情報記録に
際しての光ディスクの線速、レーザパワー等の情報を前
記ウォブル信号から読み取る。If the signal can be reproduced in step 102, the wobble signal demodulated by the demodulation circuit 65 is read in step 104, and in the following step 105 C
D, a write-once CD, and a rewritable CD are identified. In the latter two cases, in steps 106 and 107, information such as the linear velocity of the optical disc and the laser power at the time of recording information is read from the wobble signal.
【0030】なお、本記録再生装置に使用する書換型C
Dは、単一波長のレーザ光に対して全体として光吸収率
が大きく(光反射率が小さく)、かつ結晶質相と非晶質
相との間に、ある程度の光反射率の差があれば良いか
ら、図6に示す書換型CDの光干渉膜12A〜12Dの
積層数を少なくして、構造の簡易化を図ることが可能で
ある。A rewritable C used in the recording / reproducing apparatus.
D has a large optical absorptivity (small optical reflectivity) as a whole for laser light of a single wavelength, and there is some difference in optical reflectivity between the crystalline phase and the amorphous phase. Therefore, it is possible to simplify the structure by reducing the number of stacked optical interference films 12A to 12D of the rewritable CD shown in FIG.
【0031】このように、信号再生が良好に行えるよう
にプリアンプ61のゲインを変更することにより、書換
型CD、追記型CD、CDのいずれの情報再生も可能と
なる。 (第2実施例)上記第1実施例においては、信号再生が
良好に行えるようにプリアンプ61のゲインを変更する
ことにより、書換型CD、追記型CD、CDのいずれの
情報再生も可能としたが、再生時のレーザ光パワーを、
信号再生が良好に行えるように変更するようにしても、
同様の効果が得られる。この時のレーザ光パワーの増強
は情報再生時のものであるから、情報記録時のレーザ光
パワーを増強する従来技術に比して、その増強の程度は
十分小さくてよく、電力消費が大幅に増えることはな
い。As described above, by changing the gain of the preamplifier 61 so that the signal can be reproduced well, it is possible to reproduce any information of the rewritable CD, the write-once CD and the CD. (Second Embodiment) In the first embodiment, by changing the gain of the preamplifier 61 so that the signal can be reproduced well, it is possible to reproduce any information of rewritable CD, write-once CD and CD. However, the laser light power during playback is
Even if you change it so that signal reproduction can be performed well,
The same effect can be obtained. Since the enhancement of the laser light power at this time is performed at the time of information reproduction, the extent of the enhancement may be sufficiently small as compared with the conventional technology for enhancing the laser light power at the time of information recording, and the power consumption is significantly reduced. It does not increase.
【0032】(第3実施例)本実施例では、図5に示す
ように、書換型CD基板11の、情報記録域11a外の
内周側あるいは外周側のディスク面に、少なくとも識別
情報を含んだマーク12A,12Bを設ける。このマー
ク12A,12Bとしては、シールの貼り付け、所定形
状の凹陥部、磁気膜や金属膜の貼り付けないし蒸着等、
種々のものが使用でき、当該マークを、光学式、磁気
式、静電容量式等の各種センサで読み取って、前記制御
回路7(図2)がプリアンプ61のゲインを変更する。
これにより、記録情報の再生信号レベルを検出すること
なく、光ディスクの型を判別して速やかにゲインを変更
することができる。この場合、上記マークをディスク面
上で二位置にスライド移動可能として、そのスライド位
置により、書き込み(記録)を禁止する等の用途にも使
用することができる。なお、書き込み禁止については、
マークに直接当該情報を書き込むようにしても良い。(Third Embodiment) In this embodiment, as shown in FIG. 5, the rewritable CD substrate 11 has at least identification information on the inner or outer disc surface outside the information recording area 11a. D marks 12A and 12B are provided. As the marks 12A and 12B, sticking of seals, recesses of a predetermined shape, sticking or vapor deposition of magnetic films and metal films, etc.
Various types can be used, and the control circuit 7 (FIG. 2) changes the gain of the preamplifier 61 by reading the mark with various sensors such as an optical type, a magnetic type, and a capacitance type.
As a result, the type of the optical disc can be determined and the gain can be changed quickly without detecting the reproduction signal level of the recorded information. In this case, the mark can be slidably moved to two positions on the disk surface, and the slide position can also be used for prohibiting writing (recording). Regarding write protection,
The information may be directly written in the mark.
【0033】(第4実施例)上記第3実施例におけるプ
リアンプのゲイン変更に代えて、レーザ光パワーを変更
するようにしても良い。(Fourth Embodiment) Instead of changing the gain of the preamplifier in the third embodiment, the laser light power may be changed.
【図1】本発明の第1実施例に係る記録再生装置の全体
概略ブロック構成図である。FIG. 1 is an overall schematic block configuration diagram of a recording / reproducing apparatus according to a first embodiment of the present invention.
【図2】本発明の第1実施例に係る再生回路の詳細ブロ
ック構成図である。FIG. 2 is a detailed block diagram of a reproducing circuit according to the first embodiment of the present invention.
【図3】本発明の第1実施例に係る書換型CDのディス
ク基板の部分拡大斜視図である。FIG. 3 is a partially enlarged perspective view of the disk substrate of the rewritable CD according to the first embodiment of the present invention.
【図4】本発明の第1実施例に係る情報再生の作動を説
明するフローチャートである。FIG. 4 is a flowchart illustrating an operation of information reproduction according to the first embodiment of the present invention.
【図5】本発明の第3実施例に係る書換型CDの全体平
面図である。FIG. 5 is an overall plan view of a rewritable CD according to a third embodiment of the present invention.
【図6】従来の書換型CDの断面構造を示す模式図であ
る。FIG. 6 is a schematic diagram showing a cross-sectional structure of a conventional rewritable CD.
【図7】従来の書換型CD情報記録部の光反射率の波長
依存性を示すグラフである。FIG. 7 is a graph showing wavelength dependence of light reflectance of a conventional rewritable CD information recording portion.
1 光ディスク 11 媒体基板 11a 記録情報記録域 111 案内溝 12A、12B マーク 2 光学ヘッド 4 レーザ駆動回路 61 プリアンプ 64 フィルタ 65 ウォブル信号復調回路 66 信号処理回路 7 制御回路 1 optical disk 11 medium substrate 11a recording information recording area 111 guide groove 12A, 12B mark 2 optical head 4 laser driving circuit 61 preamplifier 64 filter 65 wobble signal demodulating circuit 66 signal processing circuit 7 control circuit
Claims (7)
録時には相対的に強い強度範囲のレーザ光を記録情報に
応じて強弱照射するとともに、情報再生時には相対的に
弱い強度範囲のレーザ光を照射するレーザ光照射手段
と、 情報再生時に、照射された前記レーザ光の反射光を入力
してその強度に応じた出力信号を発する受光手段と、 前記出力信号のレベルに応じて前記受光手段の増幅率を
変更する増幅率変更手段と、 前記受光手段の出力信号より前記記録情報を得る情報入
手手段と、 を備えることを特徴とする書換型光情報記録媒体の記録
再生装置。1. A rewritable optical information recording medium is irradiated with laser light in a relatively strong intensity range according to recorded information during information recording, and laser light in a relatively weak intensity range during information reproduction. A laser light irradiating means for irradiating the light, a light receiving means for receiving the reflected light of the radiated laser light and outputting an output signal according to the intensity of the laser light during information reproduction, and the light receiving means according to the level of the output signal. 2. A recording / reproducing apparatus for a rewritable optical information recording medium, comprising: an amplification factor changing unit for changing the amplification factor of 1. and an information acquisition unit for obtaining the recording information from an output signal of the light receiving unit.
録時には相対的に強い強度範囲のレーザ光を記録情報に
応じて強弱照射するとともに、情報再生時には相対的に
弱い強度範囲のレーザ光を照射するレーザ光照射手段
と、 情報再生時に、照射された前記レーザ光の反射光を入力
してその強度に応じた出力信号を発する受光手段と、 前記出力信号のレベルを最適にすべく前記レーザ光照射
手段からの照射レーザ光の強度を変更するレーサ光強度
変更手段と、 前記受光手段の出力信号より前記記録情報を得る情報入
手手段と、 を備えることを特徴とする書換型光情報記録媒体の記録
再生装置。2. A rewritable optical information recording medium is irradiated with laser light in a relatively strong intensity range according to recorded information during information recording, and laser light in a relatively weak intensity range during information reproduction. A laser light irradiating means for irradiating, a light receiving means for inputting the reflected light of the radiated laser light and outputting an output signal according to its intensity at the time of reproducing information, and a light receiving means for optimizing the level of the output signal. A rewritable optical information recording device comprising: a laser light intensity changing unit that changes the intensity of the laser light emitted from the laser light emitting unit; and an information obtaining unit that obtains the recorded information from the output signal of the light receiving unit. Medium recording / reproducing apparatus.
録時には相対的に強い強度範囲のレーザ光を記録情報に
応じて強弱照射するとともに、情報再生時には相対的に
弱い強度範囲のレーザ光を照射するレーザ光照射手段
と、 情報再生時に、照射された前記レーザ光の反射光を入力
してその強度に応じた出力を発する受光手段と、 該受光手段の出力より前記記録情報を得る情報入手手段
と、 情報再生される光情報記録媒体の種類を識別する識別情
報を読み取る読取手段と、 読み取った前記識別情報が書換型か非書換型かにより前
記受光手段の増幅率を変更する増幅率変更手段とを備え
ることを特徴とする書換型光情報記録媒体の記録再生装
置。3. A rewritable optical information recording medium is irradiated with laser light in a relatively strong intensity range during information recording according to recorded information, and laser light in a relatively weak intensity range during information reproduction. A laser light irradiating means for irradiating the light, a light receiving means for receiving the reflected light of the radiated laser light and outputting an output according to the intensity thereof at the time of reproducing the information, and information for obtaining the recorded information from the output of the light receiving means. Acquisition means, reading means for reading identification information for identifying the type of optical information recording medium on which information is reproduced, and amplification factor for changing the amplification factor of the light receiving means depending on whether the read identification information is rewritable or non-rewritable A recording / reproducing apparatus for a rewritable optical information recording medium, comprising: a changing unit.
録時には相対的に強い強度範囲のレーザ光を記録情報に
応じて強弱照射するとともに、情報再生時には相対的に
弱い強度範囲のレーザ光を照射するレーザ光照射手段
と、 情報再生時に、照射された前記レーザ光の反射光を入力
してその強度に応じた出力を発する受光手段と、 該受光手段の出力より前記記録情報を得る情報入手手段
と、 情報再生される光情報記録媒体の種類を識別する識別情
報を読み取る読取手段と、 読み取った前記識別情報が書換型か非書換型かにより前
記レーザ光照射手段からの照射レーザ光の強度を変更す
るレーサ光強度変更手段とを備えることを特徴とする書
換型光情報記録媒体の記録再生装置。4. A rewritable optical information recording medium is irradiated with laser light in a relatively strong intensity range according to recorded information during information recording, and laser light in a relatively weak intensity range during information reproduction. A laser light irradiating means for irradiating the light, a light receiving means for receiving the reflected light of the radiated laser light and outputting an output according to the intensity thereof at the time of reproducing information, and information for obtaining the recorded information from the output of the light receiving means. Acquisition means, reading means for reading the identification information for identifying the type of the optical information recording medium from which information is reproduced, and reading laser light emitted from the laser light irradiation means depending on whether the read identification information is rewritable or non-rewritable. A rewritable optical information recording medium recording / reproducing apparatus, comprising: a laser light intensity changing means for changing the intensity.
情報再生時とで同一波長のレーザ光を照射するものであ
ることを特徴とする請求項1ないし4のいずれか一つに
記載の書換型光情報記録媒体の記録再生装置。5. The laser light irradiating means irradiates laser light of the same wavelength during information recording and during information reproduction, according to any one of claims 1 to 4. Recording / reproducing apparatus for rewritable optical information recording medium.
の書換型光情報記録媒体の記録再生装置に使用する書換
型光情報記録媒体であって、レーザ光を相対的に強い強
度範囲で記録情報に応じて記録層に強弱照射することに
より、相対的に弱い強度範囲でレーザ光を照射した時の
反射率が相違する結晶質相と非晶質相を前記記録層に形
成して記録情報の記録をなす書換型光情報記録媒体にお
いて、媒体基板の一部に書換型と非書換型の種類を識別
する識別情報を、前記結晶質相と非晶質相の間の相転移
以外の方法で記録してあることを特徴とする書換型光情
報記録媒体。6. A rewritable optical information recording medium used in a recording / reproducing apparatus for a rewritable optical information recording medium according to claim 3, wherein the laser beam has a relatively high intensity range. By irradiating the recording layer with strong and weak light according to the recorded information, a crystalline phase and an amorphous phase having different reflectances when irradiated with laser light in a relatively weak intensity range are formed in the recording layer. In a rewritable optical information recording medium for recording recorded information, identification information for discriminating between a rewritable type and a non-rewritable type is provided on a part of a medium substrate except for the phase transition between the crystalline phase and the amorphous phase. A rewritable optical information recording medium characterized by being recorded by the method of.
報を記録する領域外に設けたマークに記録したことを特
徴とする請求項6に記載の書換型光情報記録媒体。7. The rewritable optical information recording medium according to claim 6, wherein the identification information is recorded on a mark provided on the surface of the medium substrate outside the area for recording the recording information.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9338495A JPH08287466A (en) | 1995-04-19 | 1995-04-19 | Recording/reproducing device for rewritable optical information recording medium |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9338495A JPH08287466A (en) | 1995-04-19 | 1995-04-19 | Recording/reproducing device for rewritable optical information recording medium |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH08287466A true JPH08287466A (en) | 1996-11-01 |
Family
ID=14080823
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9338495A Pending JPH08287466A (en) | 1995-04-19 | 1995-04-19 | Recording/reproducing device for rewritable optical information recording medium |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08287466A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008103029A (en) * | 2006-10-19 | 2008-05-01 | Kenwood Corp | Optical disk reproducing device, spherical aberration correction method, and spherical aberration correction program |
-
1995
- 1995-04-19 JP JP9338495A patent/JPH08287466A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008103029A (en) * | 2006-10-19 | 2008-05-01 | Kenwood Corp | Optical disk reproducing device, spherical aberration correction method, and spherical aberration correction program |
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