JP3630355B2 - Optical information recording medium initialization method and initialization apparatus - Google Patents

Optical information recording medium initialization method and initialization apparatus Download PDF

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JP3630355B2
JP3630355B2 JP02993597A JP2993597A JP3630355B2 JP 3630355 B2 JP3630355 B2 JP 3630355B2 JP 02993597 A JP02993597 A JP 02993597A JP 2993597 A JP2993597 A JP 2993597A JP 3630355 B2 JP3630355 B2 JP 3630355B2
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recording medium
information recording
optical information
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support
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JPH09282718A (en
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惠昭 古川
克巳 河原
昇 山田
健一 西内
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Panasonic Corp
Panasonic Holdings Corp
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Panasonic Corp
Matsushita Electric Industrial Co Ltd
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Description

【０００１】
【発明の属する技術分野】
本発明は、基板上に形成されたレーザ光線等の照射により光学特性が変化する記録層を有する光学情報記録媒体の初期化方法及び初期化装置に関する。
【０００２】
【従来の技術】
一般的に、相変化光記録媒体及び光磁気記録媒体を含む光学情報記録媒体の初期化方法として、フラッシュ光を光学情報記録媒体の記録面全体に一括して照射することが行われている。フラッシュ光による光学情報記録媒体の初期化では、光学情報記録媒体の全面を一括して初期化することができ、初期化（結晶化）に要する時間は１〜２ｍｓである。なお、相変化光記録媒体では、通常データの記録は記録薄膜層の各領域を結晶状態からアモルファス状態に変化させることにより行うので、記録を行なう前に記録薄膜層の記録領域全体を予め結晶状態に転換することを初期化という。一方、光磁気記録媒体では、記録前に記録薄膜層の裏磁化方向を揃えることを初期化という。
【０００３】
しかしながら、例えばディスク状の光学情報記録媒体をフラッシュ光の照射により全面を一括して初期化した場合、光学情報記録媒体の外周端付近と内周端付近における記録層等にクラックやシワが発生する場合がある。この原因としては以下の事が考えられる。
【０００４】
光学情報記録媒体の記録層がフラッシュ光を吸収すると、記録層の温度が急激に上昇する。通常、記録層上に金属からなる反射層が形成されており、記録層及び反射層の熱伝導率は基板や保護層の熱伝導率よりも高いので、記録層で発生する熱は、これらを通して周囲に拡散する。しかし、光学情報記録媒体の外周端より外側及び内周端より内側には記録層がなく、開放されているので、外周端近傍領域及び内周端近傍領域は、放熱が制限される。このため、外周端近傍領域及び内周端近傍領域の記録層の温度は、これらの中間の領域の記録層の温度よりも高くなり、熱負荷が大きくなる。その結果、外周端近傍領域及び内周端近傍領域の記録層にクラックやシワが発生する。
【０００５】
一般的に、光学情報記録媒体の外周端近傍領域及び内周端近傍領域は、情報記録再生装置等へ装着する際のチャッキング用のマージンとして用いられ、情報の記録再生は行われない。しかしながら、これらの領域にクラックやシワが発生すると、クラック部分から記録層の内部に水分や不要物質が侵入し、これらの領域以外の記録層における情報の記録再生の際の誤動作の原因となったり、光学情報記録媒体を劣化させる原因となる。
【０００６】
これらクラックやシワの発生を防止するために、例えば、特開平１−３００４３９号公報には、光学情報記録媒体の外周端近傍領域及び内周端近傍領域を初期化しない光学情報記録媒体の初期化装置が提案されている。光学情報記録媒体の外周端近傍領域及び内周端近傍領域の記録層を初期化しない従来の光学情報記録媒体の初期化装置について、図１０を参照しつつ説明する。
【０００７】
図１０に示す従来の光学情報記録媒体の初期化装置では、支持体８０上のディスク状の光学情報記録媒体１にマスク８１及び８２を載置し、フラッシュランプ４からの照射光のうち、光学情報記録媒体１の外周端近傍領域及び内周端近傍領域への入射光を遮蔽する。その結果、外周端近傍領域及び内周端近傍領域は初期化されず、これらの領域における記録層の温度上昇が低減し、クラックやシワの発生が防止される。
【０００８】
なお、光学情報記録媒体１の内周端近傍領域に関しては、実際に情報が記録される領域に対して余裕があるため、若干のクラックやシワの発生は許容できる場合もある。そのため、光学情報記録媒体１の内周端近傍領域での記録層のクラックやシワの発生が許容できる場合は、光学情報記録媒体１の内周端近傍領域を覆うようにマスク８２を省略してもよい。
【０００９】
【発明が解決しようとする課題】
しかしながら、図１０に示した従来の初期化装置を用いて光学情報記録媒体の初期化を行う場合、各光学情報記録媒体１ごとにマスク８１、８２を載置しなければならず、またその位置決めが困難である。そのため、例えば光学情報記録媒体の生産ライン等で多数の光学情報記録媒体の初期化を行う場合、作業効率が悪く、生産性が低いという問題点を有していた。
【００１０】
本発明は、上記従来例の問題点を解決するためになされたものであり、簡単な操作により、光学情報記録媒体の少なくとも外周端近傍領域を除くその他の部分のみを初期化し、光学情報記録媒体の端部付近でのクラックやシワの発生を防止し得る初期化方法及び初期化装置を提供することを目的としている。
【００１１】
【課題を解決するための手段】
本発明の第１の構成の光学情報記録媒体の初期化方法は、光の照射により光学特性が変化する記録層を備えた光学情報記録媒体を、フラッシュ光の照射により初期化する方法であって、前記光学情報記録媒体を支持するための支持体に、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の内周部と前記外周部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段として、前記支持体に支持された前記光学情報記録媒体の外周に沿って、前記フラッシュ光の光源側に突出した前記光学情報記録媒体の厚さよりも高い壁を設け、前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射し、少なくとも前記第２の領域を初期化する。
【００１３】
入射光量調節手段として形成した壁の存在により、光学情報記録媒体の外周部近傍の第１の領域に斜めに入射する光の一部が遮られ、第１の領域に入射する光量が第２の領域に入射する光量よりも少なくなる。その結果、少なくとも第２の領域が初期化された時点での第１の領域の記録層の温度上昇を小さくすることができ、第１の領域での記録層のクラックやシワの発生を防止することができる。また、光学情報記録媒体を支持体上に載置する際、壁が位置決めガイドとして機能し、光学情報記録媒体の位置決めが容易になる。
【００１４】
本発明の第２の構成の光学情報記録媒体の初期化方法は、光の照射により光学特性が変化する記録層を備えた光学情報記録媒体を、フラッシュ光の照射により初期化する方法であって、前記光学情報記録媒体を支持するための支持体に、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の内周部と前記外周部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段として、前記支持体の前記光学情報記録媒体が載置される表面に光の反射率が異なる複数の領域を形成し、前記第２の領域に対向する領域の反射率を前記第１の領域に対向する領域の反射率よりも高くして、前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射し、少なくとも前記第２の領域を初期化する。
支持体表面の第２の領域に対向する領域の反射率を第１の領域に対向する領域の反射率よりも高くすることにより、光学情報記録媒体を透過して支持体により反射され、再度光学情報記録媒体に入射する光量に関して、第２の領域に再入射する光量が第１の領域に再入射する光量よりも多くなる。その結果、少なくとも第２の領域が初期化された時点での第１の領域の記録層の温度上昇を小さくすることができ、第１の領域での記録層のクラックやシワの発生を防止することができる。また、反射率の高い領域を目印にして光学情報記録媒体の位置決めをすることができ、位置決め作業が容易になる。
【００１５】
本発明の第３の構成の光学情報記録媒体の初期化方法は、光の照射により光学特性が変化する記録層を備えた光学情報記録媒体を、フラッシュ光の照射により初期化する方法であって、前記光学情報記録媒体を支持するための支持体に、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の内周部と前記外周部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段として、前記支持体の前記光学情報記録媒体が載置される表面のうち、少なくとも前記第１の領域に対向する部分に凹みを形成し、前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射し、少なくとも前記第２の領域を初期化する。
支持体表面の第１の領域に対向する部分を凹ませることにより、光学情報記録媒体を透過して支持体により反射され、再度光学情報記録媒体に入射する光量に関して、第２の領域に再入射する光量が第１の領域に再入射する光量よりも多くなる。その結果、少なくとも第２の領域が初期化された時点での第１の領域の温度上昇を小さくすることができ、第１の領域での記録層のクラックやシワの発生を防止することができる。また、凹みを目印にして光学情報記録媒体の位置決めをすることができ、位置決め作業が容易になる。
【００１７】
本発明の第４の構成の光学情報記録媒体の初期化方法は、光の照射により光学特性が変化する記録層を備えた光学情報記録媒体を、フラッシュ光の照射により初期化する方法であって、前記光学情報記録媒体を支持するための支持体に、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域および内周部近傍の第３の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の前記内周部と前記外周部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段として、前記支持体に支持された前記光学情報記録媒体の外周及び内周に沿って、前記フラッシュ光の光源側に突出した前記光学情報記録媒体の厚さよりも高い壁を形成し、前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射し、少なくとも前記第２の領域を初期化する。
本発明の第５の構成の光学情報記録媒体の初期化方法は、光の照射により光学特性が変化する記録層を備えた光学情報記録媒体を、フラッシュ光の照射により初期化する方法であって、前記光学情報記録媒体を支持するための支持体に、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域および内周部近傍の第３の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の前記内周部と前記外周部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段として、前記支持体の前記光学情報記録媒体が載置される表面に光の反射率が異なる複数の領域を形成し、前記第２の領域に対向する領域の反射率が前記第１の領域及び前記第３の領域に対向する領域の反射率よりも高くする。
本発明の第６の構成の光学情報記録媒体の初期化方法は、光の照射により光学特性が変化する記録層を備えた光学情報記録媒体を、フラッシュ光の照射により初期化する方法であって、前記光学情報記録媒体を支持するための支持体に、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域および内周部近傍の第３の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の前記内周部と前記外周部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段として、前記支持体の前記光学情報記録媒体が載置される表面のうち、少なくとも前記第１の領域及び前記第３の領域に対向する部分が凹ませる。
これらの構成により、第１の領域及び第３の領域に入射する光量が第２の領域に入射する光量よりも少なくなり、少なくとも第２の領域が初期化された時点での第１の領域及び第３の領域の記録層の温度上昇を小さくすることができ、第１の領域及び第３の領域での記録層のクラックやシワの発生を防止することができる。
【００２０】
一方、本発明の第１の構成の光学情報記録媒体の初期化装置は、光の照射により光学特性が変化する記録層を備えた光学情報記録媒体の初期化装置であって、前記光学情報記録媒体を支持するための支持体と、前記支持体に設けられ、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の中央部と前記端部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段と、前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射するフラッシュ光源とを具備し、前記入射光量調節手段は、前記支持体に支持された前記光学情報記録媒体の外周に沿って、前記フラッシュ光の光源側に突出した前記光学情報記録媒体の厚さよりも高い壁である。
この壁により、光学情報記録媒体の外周部近傍の第１の領域に斜めに入射する光の一部が遮られ、第１の領域に入射する光量が第２の領域に入射する光量よりも少なくなる。その結果、少なくとも第２の領域が初期化された時点での第１の領域における記録層の温度上昇を小さくすることができ、第１の領域での記録層のクラックやシワの発生を防止することができる。また、光学情報記録媒体を支持体上に載置する際、壁が位置決めガイドとして機能し、光学情報記録媒体の位置決めが容易になる。
【００２１】
さらに、前記壁の高さを調節する調節手段を有することが好ましい。特に、前記入射光量調節手段は略円筒状の枠体であり、前記支持体は前記枠体及び前記枠体の中心軸に平行に移動可能なテーブルを含むことが好ましい。
壁の高さを調節することにより、壁により第１の領域に斜めに入射する光が遮られる範囲を調節することができる。その結果、厚さや構造等の異なる複数の種類の光学情報記録媒体を、同一の装置で初期化をすることができる。また、光学情報記録媒体を支持体上に載置した後、壁の高さを微調整できるので、初期化すべき領域とクラック等の発生を防止すべき領域との区別を精度よく行うことができる。
【００２２】
本発明の第２の構成の光学情報記録媒体の初期化装置は、光の照射により光学特性が変化する記録層を備えた光学情報記録媒体の初期化装置であって、前記光学情報記録媒体を支持するための支持体と、前記支持体に設けられ、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の中央部と前記端部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段と、前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射するフラッシュ光源とを具備し、前記入射光量調節手段は、テーブル状の支持体上に載置された光学情報記録媒体の外周部と嵌合する内周部を有する枠体である。
この様な構成により、フラットな支持体上の任意の位置に枠体を載置し、この枠体をガイドとして光学情報記録媒体の位置決めを容易に行うことができる。
特に、支持体の表面積及びフラッシュ光源の照射領域を光学情報記録媒体の大きさよりもはるかに大きくすることにより、多数の光学情報記録媒体を一度に初期化することができる。
【００２３】
上記構成において、前記壁の高さをｄ、前記支持体のテーブル面から前記光学情報記録媒体中の記録層までの高さをｈ、前記光学情報記録媒体の中心から外周端までの距離をＡ、前記光学情報記録媒体の中心から初期化すべき前記第２の領域の外周端までの距離をａとして、ｄ≧ｈ＋（Ａ−ａ）を満足することが好ましい。
この条件を満足することにより、情報の記録に関して実用的に充分な初期化領域（第２の領域）を有し、かつその外周部近傍領域（第１の領域）の記録層にクラックやシワのない光学情報記録媒体が得られる。
【００２４】
本発明の第３の構成の光学情報記録媒体の初期化装置は、光の照射により光学特性が変化する記録層を備えた光学情報記録媒体の初期化装置であって、前記光学情報記録媒体を支持するための支持体と、前記支持体に設けられ、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の中央部と前記端部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段と、前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射するフラッシュ光源とを具備し、前記入射光量調節手段は、前記支持体の前記光学情報記録媒体が載置される表面に形成された光の反射率が異なる複数の領域を有し、前記第２の領域に対向する領域の反射率が前記第１の領域に対向する領域の反射率よりも高いことにより構成される。
特に、前記支持体の前記光学情報記録媒体が設置される表面の内、前記第２の領域に対向する領域は鏡面化処理が施され、前記第１の領域に対向する領域は黒色化処理又は粗面化処理が施されていることが好ましい。
【００２５】
支持体表面の第２の領域に対向する領域の反射率を第１の領域に対向する領域の反射率よりも高くすることにより、光学情報記録媒体を透過して支持体により反射され、再度光学情報記録媒体に入射する光量に関して、第２の領域に再入射する光量が第１の領域に再入射する光量よりも多くなる。その結果、少なくとも第２の領域が初期化された時点での第１の領域の記録層の温度上昇を小さくすることができ、第１の領域での記録層のクラックやシワの発生を防止することができる。また、鏡面化処理が施された反射率の高い領域を目印にして光学情報記録媒体の位置決めをすることができ、位置決め作業が容易になる。
【００２６】
本発明の第４の構成の光学情報記録媒体の初期化装置は、光の照射により光学特性が変化する記録層を備えた光学情報記録媒体の初期化装置であって、前記光学情報記録媒体を支持するための支持体と、前記支持体に設けられ、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の中央部と前記端部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段と、前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射するフラッシュ光源とを具備し、前記入射光量調節手段は、前記支持体の前記光学情報記録媒体が載置される表面のうち、少なくとも前記第１の領域に対向する部分に形成された凹部である。
特に、前記支持体の前記光学情報記録媒体が設置される表面の内、前記第２の領域に対向する領域は鏡面化処理が施されていることが好ましい。さらに、前記凹部の内面に黒色化処理又は粗面化処理が施されていることが好ましい。
【００２７】
支持体表面の第１の領域に対向する部分を凹ませることにより、光学情報記録媒体を透過して支持体により反射され、再度光学情報記録媒体に入射する光量に関して、第２の領域に再入射する光量が第１の領域に再入射する光量よりも多くなる。その結果、少なくとも第２の領域が初期化された時点での第１の領域の記録層の温度上昇を小さくすることができ、第１の領域での記録層のクラックやシワの発生を防止することができる。また、凹みを目印にして光学情報記録媒体の位置決めをすることができ、位置決め作業が容易になる。
【００２９】
本発明の第５の構成の光学情報記録媒体の初期化装置は、光の照射により光学特性が変化する記録層を備えた光学情報記録媒体の初期化装置であって、前記光学情報記録媒体を支持するための支持体と、前記支持体に設けられ、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域および内周部近傍の第３の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の中央部と前記端部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段と、前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射するフラッシュ光源とを具備し、前記入射光量調節手段は、前記支持体に支持された前記光学情報記録媒体の外周及び内周に沿って、前記フラッシュ光の光源側に突出した前記光学情報記録媒体の厚さよりも高い壁である。
前記壁の高さを調節する調節手段を有することが好ましい。
本発明の第６の構成の光学情報記録媒体の初期化装置は、光の照射により光学特性が変化する記録層を備えた光学情報記録媒体の初期化装置であって、前記光学情報記録媒体を支持するための支持体と、前記支持体に設けられ、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域および内周部近傍の第３の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の中央部と前記端部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段と、前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射するフラッシュ光源とを具備し、前記入射光量調節手段は略円筒状の枠体及び前記枠体の中心軸上に設けられた突起であり、前記支持体は前記枠体、前記突起及び前記枠体の中心軸に平行に移動可能なテーブルを含む。
【００３０】
本発明の第７の構成の光学情報記録媒体の初期化装置は、光の照射により光学特性が変化する記録層を備えた光学情報記録媒体の初期化装置であって、前記光学情報記録媒体を支持するための支持体と、前記支持体に設けられ、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域および内周部近傍の第３の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の中央部と前記端部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段と、前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射するフラッシュ光源とを具備し、前記入射光量調節手段は、テーブル状の支持体上に載置された光学情報記録媒体の外周部と嵌合する内周部を有する枠体、及び前記光学情報記録媒体の内周部と嵌合する外周部を有する突起である。
また、前記壁の高さをｄ、前記支持体のテーブル面から前記光学情報記録媒体中の記録層までの高さをｈ、前記光学情報記録媒体の中心から外周端までの距離をＡ、前記光学情報記録媒体の中心から初期化すべき前記第２の領域の外周端までの距離をａとして、ｄ≧ｈ＋（Ａ−ａ）を満足することが好ましい。
【００３１】
本発明の第８の構成の光学情報記録媒体の初期化装置は、光の照射により光学特性が変化する記録層を備えた光学情報記録媒体の初期化装置であって、前記光学情報記録媒体を支持するための支持体と、前記支持体に設けられ、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域および内周部近傍の第３の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の中央部と前記端部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段と、前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射するフラッシュ光源とを具備し、前記入射光量調節手段は、前記支持体の前記光学情報記録媒体が載置される表面に形成された光の反射率が異なる複数の領域を有し、前記第２の領域に対向する領域の反射率が前記第１の領域及び第３の領域に対向する領域の反射率よりも高いことにより構成される。
また、前記支持体の前記光学情報記録媒体が設置される表面の内、前記第２の領域に対向する領域は鏡面化処理が施され、前記第１の領域及び第３の領域に対向する領域は黒色化処理又は粗面化処理が施されていることが好ましい。
【００３２】
本発明の第９の構成の光学情報記録媒体の初期化装置は、光の照射により光学特性が変化する記録層を備えた光学情報記録媒体の初期化装置であって、前記光学情報記録媒体を支持するための支持体と、前記支持体に設けられ、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域および内周部近傍の第３の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の中央部と前記端部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段と、前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射するフラッシュ光源とを具備し、前記入射光量調節手段は、前記支持体の前記光学情報記録媒体が載置される表面のうち、少なくとも前記第１の領域及び第３の領域に対向する部分に形成された凹部である。
また、前記支持体の前記光学情報記録媒体が設置される表面の内、前記第２の領域に対向する領域は鏡面化処理が施されていることが好ましい。
また、前記凹部の内面に黒色化処理又は粗面化処理が施されていることが好ましい。
【００３３】
（第１の実施例）
本発明の光学情報記録媒体の初期化方法及び初期化装置の第１の実施例について説明する。図１は、第１の実施例の光記録媒体の初期化装置の構成を示す断面斜視図である。図２（ａ）は、図１に示された初期化装置による光学情報記録媒体の初期化状態における符号Ｘで特定した円内の拡大断面図である。図２（ｂ）は、光学情報記録媒体１の外周端近傍領域１３ａ、内周端近傍領域１３ｃ及び初期化領域１３ｂの位置関係を示す図である。
【００３４】
図１に示すように、支持体２は、略円筒状の枠体１４と、枠体１４の中心軸上に設けられた突起１５と、枠体１４と突起１５との間のリング状の凹み３に嵌合し、枠体１４の中心軸方向に上下動するリング状のテーブル１８と、凹み３の深さ、すなわち、枠体１４及び突起１５による壁の高さを調節するための調節機構２１等を具備する。調節機構２１は、枠体１４の底板１４ａに設けられためねじ及びめねじと螺合するおねじ２１ａ等で構成されている。
【００３５】
支持体２の材料として、金属や樹脂等の種々の材料を用いることができる。特に、形状的安定性及び耐候性に優れたステンレス鋼、炭素鋼、銅、銅合金、真鍮、アルミニウム及びアルミニウム合金等を用いることが望ましい。
【００３６】
図２（ｂ）に示すように、光学情報記録媒体１はリング状又は中央部にチャッキング用の嵌合穴１ａを有するディスク状である。光学情報記録媒体１の内、外周端から約１〜２ｍｍの範囲の外周端近傍領域（第１の領域）１３ａ及び内周端から約１０〜１５ｍｍの範囲の内周端近傍領域（第３の領域）１３ｃは、情報が記録されない、いわゆるマージン部分であり、必ずしも初期化する必要はない。また、これらの領域間の初期化領域（第２の領域）１３ｂは情報が記録される部分であり、初期化する必要がある。枠体１４の内径は、光学情報記録媒体１の外径Ｄよりも所定の嵌合公差分だけ大きい。また、突起１５の外径は、光学情報記録媒体１の中央部の嵌合穴１ａの径よりも所定の嵌合公差分だけ小さい。従って、光学情報記録媒体１は、リング状のテーブル１８上に載置されると、ほとんど動かず、極めて高い精度で位置決めされる。
【００３７】
図２（ａ）に示すように、光学情報記録媒体１は、基板１９上に保護層、記録層及び反射層を順に積層した記録多層膜１６及び記録多層膜１６上に形成された表面保護層２０で構成されている。基板１９はＰＭＭＡ（ポリメチルメタクリレート），ポリカーボネート等の樹脂或はガラス等の材料からなる。記録多層膜１６のうち、保護層は、ＳｉＮ、ＡｌＮ等の窒化物、ＴｉＯ２ 、ＳｉＯ２ 等の酸化物、ＺｎＳ等の硫化物、又はＺｎＳ−ＳｉＯ２ 等の混合材料からなる。記録層は、Ｇｅ−Ｓｂ−Ｔｅ系材料等の光相変化材料やＦｅ−Ｔｂ−Ｃｏ系材料等の光磁気材料からなる。反射層は、Ａｕ、Ａｌ、Ｎｉ、Ｃｒ等の金属元素又はこれらの金属を主成分とする合金からなる。表面保護層２０は、樹脂をスピンコートした樹脂層や、接着剤を用いて反射層表面に貼り合わせた基板と同様の樹脂板又はガラス板からなる。
【００３８】
完成品の光学情報記録媒体の形態としては、上記構成を有する光学情報記録媒体１そのものであって、片面から情報の記録、再生及び消去を行うものだけでなく、上記構成を有する２枚の光学情報記録媒体１を、それらの反射層どうしを直接又は中間基板を介して接着剤で貼り合わせ、両面から情報の記録、再生及び消去を行うものであってもよい。なお、光学情報記録媒体１の記録層が、Ｆｅ−Ｔｅ−Ｃｏ系材料等の光磁気材料により形成されたものである場合、光磁気材料の磁化の向きを一定の方向に配向させるための磁場発生手段（図示せず）を用いる。
【００３９】
図１に示すように、光照射装置１００は、フラッシュランプ４とフラッシュランプ４の端子と並列に接続された閃光駆動回路１７等で構成されている。フラッシュランプ４の有効発光長Ｌは、光学情報記録媒体１の直径Ｄよりも長くなるように選択されている。図１では、直線状のフラッシュランプ４を１本のみ配置しているが、初期化しようとする光学情報記録媒体の形状や面積、同時に初期化する光学情報記録媒体の数等に合わせて、複数の直線状のランプを並列に配置してもよいし、渦巻状のフラッシュランプを用いてもよい。すなわち、光照射装置１００による光の照射領域の面積が、初期化しようとする光学情報記録媒体１の面積よりも大きいことが必要である。
【００４０】
閃光駆動回路１７は、フラッシュランプ４を閃光させるために必要な電気エネルギーを蓄積するメインコンデンサ５と、メインコンデンサ５を充電するための電源６と、メインコンデンサ５の充電、遮断及び過剰充電量の放電を切り換えるための切り換えスイッチ７、フラッシュランプ４の陰極と陽極との間に放電を起こさせるためのトリガスイッチ８、トリガコイル９及びトリガコンデンサ１０等で構成されている。トリガコンデンサ１０には、あらかじめ充電抵抗１１を通して電圧Ｖｔｒが印加されている。
【００４１】
光照射装置１００の閃光駆動回路１７のトリガスイッチ８を閉じると、トリガコンデンサ１０に蓄えられたエネルギーが、トリガコイル９により高周波・高電圧のエネルギーに変換され、フラッシュランプ４のトリガ電極に印加される。この高周波・高電圧により、フラッシュランプ４の内部のキセノンガスがイオン化され、陰極と陽極との間に急激な放電が開始される。この結果、メインコンデンサ５に蓄えられたエネルギーが光エネルギーに変換され、フラッシュランプ４が瞬間的に発光し、この発光により生じたフラッシュ光１２が光学情報記録媒体１の表面に照射される。例えば、複数の直線状のフラッシュランプ４を並列した場合、各フラッシュランプ４からあらゆる方向にフラッシュ光１２が照射される。
【００４２】
次に、図１に示す第１の実施例の光学情報記録媒体の初期化装置の動作、すなわち第１の実施例の光学情報記録媒体の初期化方法について説明する。
まず、ディスク状の光記録媒体１を、支持体２のテーブル１８上に載置する。ここで、あらかじめ調節機構２１を調節することにより、凹み３の深さ（又は枠体１４及び突起１５による壁の高さ）が光学情報記録媒体１の厚さよりも深く（又は高く）なるように設定されている。
【００４３】
光学情報記録媒体１の表面は、枠体１４及び突起１５の表面と比較して、フラッシュランプ４から遠い、すなわち凹んだ位置にある。一方、フラッシュランプ４からのフラッシュ光１２には、光学情報記録媒体１の表面に対して直角に入射する成分だけでなく、斜めに入射する成分も含まれる。従って、図２（ａ）に示すように、光学情報記録媒体１の表面に対して斜めに入射するフラッシュ光１２の内、一部は枠体１４及び突起１５による壁により遮られる。光学情報記録媒体１の内、枠体１４に隣接する外周端近傍領域１３ａ及び突起１５に隣接する内周端近傍領域１３ｃへの入射光量は、これらの領域間の初期化領域１３ｂへの入射光量に比べて少なくなる。光学情報記録媒体１の大部分である初期化領域１３ｂは、このフラッシュ光１２の照射により初期化に必要なエネルギーを受け、初期化される。しかし、初期化領域１３ｂが初期化された時点では、外周端近傍領域１３ａ及び内周端近傍領域１３ｃは、初期化に必要なエネルギーを受けていないため初期化されず、記録層の温度上昇も小さい。その結果、外周端近傍領域１３ａ及び内周端近傍領域１３ｃにおける記録層のクラックやシワの発生を防止することができる。
【００４４】
比較例として、上記支持体２を用いずに、光学情報記録媒体１の全面に均一にフラッシュ光１２を照射し、光学情報記録媒体１の初期化を行った。その際の、光学情報記録媒体１の表面における半径方向の照射強度（入射光量）分布を図３（ａ）に、光学情報記録媒体１半径方向の温度分布を図３（ｂ）に示す。また、図１に示す第１の実施例の光学情報記録媒体の初期化装置を用いて初期化を行った光学情報記録媒体１の表面における半径方向の照射強度分布を図３（ｃ）に、光学情報記録媒体１の半径方向の温度分布を図３（ｄ）に示す。
【００４５】
図３（ａ）に示すように、比較例では支持体２を用いていないので、光学情報記４５録媒体１の全面にフラッシュ光１２が均一に照射され、外周端近傍領域１３ａ及び内周端近傍領域１３ｃにおける照射強度は、初期化領域１３ｂにおける照射強度と等しい。フラッシュ光１２は、光学情報記録媒体１の記録層を結晶状態に転換させるのに必要なエネルギーを有している。従って、初期化領域１３ｂだけでなく、光学情報記録媒体１の外周端近傍領域１３ａ及び内周端近傍領域１３ｃにおける記録層の温度も、フラッシュ光１２の照射により、初期化温度以上に急激に上昇する。前述のように、記録層で発生した熱は、記録層及び反射層等を通して周囲に拡散するが、外周端近傍領域１３ａより外側及び内周端近傍領域１３ｃより内側には記録層及び反射層が存在しないので、熱の拡散する方向が制限され、熱が蓄積される。そのため、図３（ｂ）に示すように、外周端近傍領域１３ａ及び内周端近傍領域１３ｃの温度は初期化領域１３ｂの温度よりも高くなり、外周端近傍領域１３ａ及び内周端近傍領域１３ｃでは熱歪みが大きくなり、記録層や反射層にクラックやシワが発生する。
【００４６】
一方、図３（ｃ）に示すように、図１に示す第１の実施例の光学情報記録媒体の初期化装置を用いて初期化を行った光学情報記録媒体１の場合、支持体２による光学情報記録媒体１の外周端近傍領域１３ａ及び内周端近傍領域１３ｃへの入射光量調節機能により、外周端近傍領域１３ａ及び内周端近傍領域１３ｃにおける照射強度は、初期化領域１３ｂにおける照射強度よりも小さくなっている。フラッシュ光１２の照射により、初期化領域１３ｂの温度は、初期化温度以上に急激に上昇する。しかしながら、外周端近傍領域１３ａ及び内周端近傍領域１３ｃの照射強度は初期化領域１３ｂへの照射強度に比べて少ないため、外周端近傍領域１３ａ及び内周端近傍領域１３ｃの温度上昇は小さい。従って、図３（ｄ）に示すように、外周端近傍領域１３ａ及び内周端近傍領域１３ｃでは、熱の拡散性が悪いにもかかわらず、外周端近傍領域１３ａ及び内周端近傍領域１３ｃの温度は初期化領域１３ｂの温度よりも低くなり、その大部分は初期化されない。また、熱歪みも小さく、記録層等にはクラックやシワは発生しない。
【００４７】
なお、光学情報記録媒体１の外周端近傍領域１３ａ及び内周端近傍領域１３ｃは、通常、実際の情報の記録再生において使用されないマージン領域である。従って、かかる領域が未初期化状態であっても何等問題はない。
【００４８】
次に、支持体２における凹み３の深さ、すなわち、枠体１４及び突起１５による壁の高さについて検討する。前述のように、光学情報記録媒体１を載置するテーブル１８の位置は、調節機構２１により調節可能である。テーブル１８の位置を調節することにより、枠体１４及び突起１５による壁の高さを調節することができる。また、枠体１４及び突起１５による壁の高さを調節することにより、光学情報記録媒体１上の入射光量が調節される領域の幅を変化させることができる。
【００４９】
この実施例の場合、光学情報記録媒体１はディスク状であるので、枠体１４及び突起１５による壁の高さをｄ、テーブル１８の表面から光学情報記録媒体１中の記録多層膜１６までの高さ（又は保護層２０の厚さ）をｈ、光学情報記録媒体１の半径をＡ、初期化領域１３ｂの最外周半径をａとして、ｄ≧ｈ＋（Ａ−ａ）を満足することが好ましい。この条件を満足する範囲内で、壁の高さｄが高いほど、光学情報記録媒体１の外周端近傍領域１３ａに対して斜めに入射する光線は遮られ、枠体１４及び突起１５による壁の入射光量調節の効果が発揮される。なお、保護層２０の厚さｈ及び光学情報記録媒体１の半径Ａは光学情報記録媒体１の固有のものであり、固定されている。従って、壁の高さｄを単純に高くすると、所望する初期化領域１３ｂの最外周半径ａが得られない場合がある。また、光学情報記録媒体１の内周端近傍領域１３ｃについても同様である。
【００５０】
このように、図１に示す第１の実施例の光学情報記録媒体の初期化装置を用いることにより、光学情報記録媒体１の外周端近傍領域１３ａ及び内周端近傍領域１３ｂへのフラッシュ光１２への入射光量を、初期化領域１３ｂへの入射光量よりも少なくなるように調節することができるので、外周端近傍領域１３ａ及び内周端近傍領域１３ｂにおける記録層の温度の過剰上昇を抑制でき、クラックやシワの発生を防止しつつ、初期化領域１３ｂのみを初期化することができる。また、図１０に示す従来の初期化装置のような遮光マスク及びその位置決め工程が不要となり、光学情報記録媒体の初期化に要する時間を大幅に短縮することができる。また、初期化作業自体は、光学情報記録媒体１を支持体２のテーブル１８上に載置した後、光照射装置１００によるフラッシュ光１２を発光させるという簡単な作業だけであり、多数の光学情報記録媒体１を短時間に効率よく初期化することができる。
【００５１】
なお、図１に示す第１の実施例の光学情報記録媒体の初期化装置では、支持体２の枠体１４と突起１５の高さを同じにしているが、これに限定されるものではない。例えば、光学情報記録媒体１の内周端近傍領域１３ｃの幅が、外周端近傍領域１３ａの幅よりも広い場合は、突起１５の高さを枠体１４の高さよりも高くなるようにすればよい。また、その逆の場合も同様である。
【００５２】
また、図１に示す第１の実施例の光学情報記録媒体の初期化装置では、支持体２に枠体１４及び突起１５の両方を設けているが、光学情報記録媒体１の内周端近傍領域１３ｃは、通常、光学情報記録媒体１を記録装置へ装着する時のチャッキング部として用いられるので、光学情報記録媒体１の実記録領域は内周端から離れている場合が多い。従って、光学情報記録媒体１の内周端近傍領域１３ｃにクラックやシワが発生しても、光学情報記録媒体１に記録されている信号の品質を劣化させる影響が少ないので、突起１５を省略してもよい。
【００５３】
また、この実施例では、光学情報記録媒体１としてディスク状のものを用いたが、これに限定されるものではなく、光学情報記録媒体１がカード状、シート状又はフィルム状の場合、支持体２の枠体１４及び突起１５の断面形状をこれらの光学情報記録媒体の形状に合致させればよい。
【００５４】
（第２の実施例）
本発明の光学情報記録媒体の初期化方法及び初期化装置の第２の実施例について説明する。図４は、第２の実施例の光記録媒体の初期化装置の構成を示す断面斜視図である。図５は、図４に示された初期化装置による光学情報記録媒体の初期化状態における符号Ｙで特定した円内の拡大断面図である。なお、図１及び図２（ａ）に示した第１の実施例と同じ符号は同一又は相当する部分を示す。
【００５５】
図４に示すように、支持体２Ａは、フラットなテーブル２２と、テーブル２２上に設けられたリング状の衝立部材（又は枠体）３０及び衝立部材３０の中心に設けられた円柱状の突起３１等で構成されている。
【００５６】
光学情報記録媒体１はリング状又は中央部にチャッキング用の穴を有するディスク状であり、衝立部材３０の内径は、光学情報記録媒体１の外径よりも所定の嵌合公差分だけ大きい。また、突起３１の外径は、光学情報記録媒体１の中央部の嵌合穴の径よりも所定の嵌合公差分だけ小さい。従って、光学情報記録媒体１は、テーブル２２上に載置されると、ほとんど動かず、極めて高い精度で位置決めされる。なお、照明装置１００は図１に示す第１の実施例のものと同じであるため、その説明を省略する。
また、第２の実施例の光学情報記録媒体の初期化方法は、上記第１の実施例における初期化方法と実質的に同じであるため、その説明を省略する。
【００５７】
図４に示す第２の実施例の光学情報記録媒体の初期化装置を用いて初期化を行った光学情報記録媒体１の表面における半径方向の照射強度分布は第１の実施例の場合と同様に図３（ｃ）に示すようになり、光学情報記録媒体１の半径方向の温度分布は図３（ｄ）に示すようになる。すなわち、図４及び図５に示すように、光学情報記録媒体１の外周端近傍領域１３ａには衝立部材３０及び突起３１が隣接しているため、これら衝立部材３０及び突起３１が外周端近傍領域１３ａ及び内周端近傍領域１３ｃへの入射光量調節機能を果たし、光照射装置１００からの斜めに入射するフラッシュ光１２がこれら衝立部材３０及び突起３１により遮られる。そのため、図３（ｃ）に示すように、外周端近傍領域１３ａ及び内周端近傍領域１３ｃにおける照射強度が、初期化領域１３ｂにおける照射強度よりも小さくなる。従って、図３（ｄ）に示すように、外周端近傍領域１３ａ及び内周端近傍領域１３ｃの記録層の温度は初期化領域１３ｂの温度よりも低くなり、その大部分は初期化されない。また、記録層の熱歪みも小さく、クラックやシワは発生しない。
【００５８】
次に、支持体２Ａにおける衝立部材３０及び突起３１による壁の高さについて検討する。高さの異なる衝立部材３０及び突起３１を各種用意することにより、光学情報記録媒体１上の入射光量が調節される領域の幅を変化させることができる。
この実施例の場合も、光学情報記録媒体１はディスク状であり、衝立部材３０及び突起３１による壁の高さをｄ、テーブル２２の表面から光学情報記録媒体１中の記録多層膜１６までの高さ（又は保護層２０の厚さ）をｈ、光学情報記録媒体１の半径をＡ、初期化領域１３ｂの最外周半径をａとして、ｄ≧ｈ＋（Ａ−ａ）を満足することが好ましい。この条件を満足する範囲内で、壁の高さｄが高いほど、光学情報記録媒体１の外周端近傍領域１３ａに対して斜めに入射する光線は遮られ、衝立部材３０及び突起３１による壁の入射光量調節の効果が発揮される。なお、保護層２０の厚さｈ及び光学情報記録媒体１の半径Ａは光学情報記録媒体１の固有のものであり、固定されている。従って、壁の高さｄを単純に高くすると、所望する初期化領域１３ｂの最外周半径ａが得られない場合がある。また、光学情報記録媒体１の内周端近傍領域１３ｃについても同様である。
【００５９】
なお、図４に示す第２の実施例の光学情報記録媒体の初期化装置では、支持体２Ａの衝立部材３０と突起３１の高さを同じにしているが、これに限定されるものではない。例えば、光学情報記録媒体１の内周端近傍領域１３ｃの幅が、外周端近傍領域１３ａの幅よりも広い場合は、突起３１の高さを衝立部材３０の高さよりも高くなるようにすればよい。また、その逆の場合も同様である。
【００６０】
また、図４に示す第２の実施例の光学情報記録媒体の初期化装置では、支持体２Ａに衝立部材３０及び突起３１の両方を設けているが、光学情報記録媒体１の内周端近傍領域１３ｃは、通常、光学情報記録媒体１を記録装置へ装着する時のチャッキング部として用いられるので、光学情報記録媒体１の実記録領域は内周端から離れている場合が多い。従って、光学情報記録媒体１の内周端近傍領域１３ｃにクラックやシワが発生しても、光学情報記録媒体１に記録されている信号の品質を劣化させる影響が少ないので、突起３１を省略してもよい。
【００６１】
また、この実施例では、光学情報記録媒体１としてディスク状のものを用いたが、これに限定されるものではなく、光学情報記録媒体１がカード状、シート状又はフィルム状の場合、支持体２Ａの衝立部材３０及び突起３１の断面形状をこれらの光学情報記録媒体の形状に合致させればよい。
【００６２】
（第３の実施例）
本発明の光学情報記録媒体の初期化方法及び初期化装置の第３の実施例について説明する。図６（ａ）は、第３の実施例の光記録媒体の初期化装置の構成を示す断面斜視図であり、図６（ｂ）は、図６（ａ）に示された初期化装置による光学情報記録媒体の初期化状態における符号Ｚで特定した円内の拡大断面図である。なお、図１及び図２（ａ）に示した第１の実施例と同じ符号は同一又は相当する部分を示す。
【００６３】
図６（ａ）に示すように、支持体２Ｂは、フラットなテーブル２３及びテーブル２３の上面２３ａに形成された低光反射部４３及び高光反射部４４等で構成されている。これら低光反射部４３及び高光反射部４４は、ディスク状の光学情報記録媒体１の形状に対応してリング状に形成されている。なお、照明装置１００は図１に示す第１の実施例のものと同じであるため、その説明を省略する。
【００６４】
低光反射部４３は、テーブル２３の材料自体の光の反射率よりも低い光の反射率を有する部分である。例えば、テーブル２３が金属である場合、表面を酸化して黒色の金属酸化膜を形成する。具体例としては、テーブル２３の材質がアルミニウムの場合、黒色アルマイト処理を行う。または、テーブル２３の表面に黒色の耐熱塗料を塗布するしてもよい。さらに、テーブル２３の表面にサンドブラスト処理を施して梨地状にしてもよい。
【００６５】
一方、高光反射部４４は、テーブル２３の材料自体の光の反射率よりも高い反射率を有する部分である。例えば、テーブル２３が金属である場合、研磨やバフ仕上げ等により金属光沢が出るように処理したり、メッキ処理を施す。また、テーブル２３が金属以外の材料で構成されている場合、例えば、鏡面処理を施した金属膜を貼り付けてもよい。
【００６６】
低光反射部４３は、テーブル２３の上面２３ａの光学情報記録媒体１の外周端近傍領域１３ａと内周端近傍領域１３ｃが配置される部分に形成される。また、高光反射部４４は、テーブル２３の上面２３ａの光学情報記録媒体１の初期化領域１３ｂが配置される部分に形成される。
【００６７】
次に、第３の実施例の光学情報記録媒体の初期化方法について説明する。まず、図６（ａ）に示すように、支持体２Ｂのテーブル２３の上面２３ａに光学情報記録媒体１を載置する。このとき、光学情報記録媒体１の外周端近傍領域１３ａと内周端近傍領域１３ｃが低光反射部４３上に載置され、初期化領域１３ｂが高光反射部４４上に載置されるように位置決めを行う。次に、光学情報記録媒体１の全面に光照射装置１００によるフラッシュ光１２を照射する。ここで、光学情報記録媒体１の記録層が厚さ２０ｎｍのＧｅ−Ｓｂ−Ｔｅ系合金層であり、反射層が厚み１０ｎｍのＡｕ層である場合、光学情報記録媒体１の透過率は約５０％であるので、光学情報記録媒体１に照射されたフラッシュ光１２のほぼ半分が透過する。
【００６８】
図６（ｂ）に示すように、光学情報記録媒体１内に入射したフラッシュ光１２は、その約半分が記録多層膜１６を透過し、さらに保護層２０を透過して低光反射部４３及び高光反射部４４に達する。高光反射部４４に達したフラッシュ光１２は、高光反射部４４により反射され、光記録媒体１内に再入射し、記録多層膜１６に吸収される。一方、低光反射部４３に到達したフラッシュ光１２は、低光反射部４３によりその大部分が吸収又は散乱され、ほとんど光記録媒体１内に再入射しない。従って、フラッシュ光１２の高光反射部４４上に載置された初期化領域１３ｂへの実質的な入射光量と、低光反射部４３上に載置された外周端近傍領域１３ａと内周端近傍領域１３ｃへの実質的な入射光量に差が生じる。その結果、外周端近傍領域１３ａ及び内周端近傍領域１３ｃの記録層では、熱の拡散性が悪いにもかかわらず、外周端近傍領域１３ａ及び内周端近傍領域１３ｃの温度は初期化領域１３ｂの温度よりも低くなり、その大部分は初期化されない。また、熱歪みも小さく、クラックやシワは発生しない。
【００６９】
図６（ａ）及び（ｂ）に示す第３の実施例の光学情報記録媒体の初期化装置により光学情報記録媒体１の全面にフラッシュ光１２を照射した場合の、光学情報記録媒体１の半径方向に温度分布を図７に示す。図７から明らかなように、高光反射部４４上に載置された初期化領域１３ｂの温度は、初期化温度以上に達しているが、低光反射部４３上に載置された外周端近傍領域１３ａと内周端近傍領域１３ｃの温度は低く、特に各端部近傍は初期化温度よりも低くなっていることがわかる。
【００７０】
なお、第３の実施例における光学情報記録媒体１の初期化作業は、光学記録媒体１を支持体２Ｂ上に配置した後、光照射装置１００によりフラッシュ光１２を発光させるだけであり、多数の光学情報記録媒体１を簡単な作業により効率よく初期化を行うことできる。
【００７１】
また、第３の実施例では、高光反射部４４及び低光反射部４３を共に、支持体２Ｂのテーブル２３の表面２３ａを表面処理することにより得たが、両者間の光反射率の差が充分に得られる場合は、いずれか一方をテーブル２３の表面、すなわち、テーブル２３の材料そのものの露出面としてもよい。
【００７２】
（第４の実施例）
本発明の光学情報記録媒体の初期化方法及び初期化装置の第４の実施例について説明する。図８（ａ）は、第４の実施例の光記録媒体の初期化装置の構成を示す断面斜視図であり、図８（ｂ）は、図８（ａ）に示された初期化装置による光学情報記録媒体の初期化状態における符号Ｖで特定した円内の拡大断面図である。なお、図１及び図２（ａ）に示した第１の実施例と同じ符号は同一又は相当する部分を示す。
【００７３】
図８（ａ）に示すように、支持体２Ｃは、テーブル２４の上面には、リング状の突起６１ａ及びリング状の突起６１ａの中心軸上の円柱状の突起６１ｂを有する。光学情報記録媒体１は突起６１ａ及び６１ｂにより支えられる。リング状の突起６１ａは光学情報記録媒体１の初期化領域１３ｂに対応する。また、リング状の突起６１ａの外側の凹み６２ａは光学情報記録媒体１の外周端近傍領域１３ａに対応する。さらに、リング状の突起６１ａと円柱状の突起６１ｂとの間のリング状の凹み６２ｂは光学情報記録媒体１の内周端近傍領域１３ｃに対応する。なお、リング状の突起６１ａの表面は、上記第３の実施例の場合の高光反射部４４の表面と同様に、鏡面処理等により高光反射率にしておくことが望ましい。また、各凹み６２ａ及び６２ｂの内面は、上記第３の実施例の場合の低光反射部４３の表面と同様に、サンドブラスト処理等により低光反射率にしておくのが望ましい。
【００７４】
次に、第４の実施例の光学情報記録媒体の初期化方法について説明する。まず、図８（ａ）に示すように、支持体２Ｃのテーブル２４の上面に光学情報記録媒体１を載置する。このとき、光学情報記録媒体１の外周端近傍領域１３ａと内周端近傍領域１３ｃが凹み６２ａ及び６２ｂ上に載置され、初期化領域１３ｂがリング状の突起６１ａ上に載置されるように位置決めを行う。次に、光学情報記録媒体１の全面に光照射装置１００によるフラッシュ光１２を照射する。ここで、光学情報記録媒体１の記録層が厚さ２０ｎｍのＧｅ−Ｓｂ−Ｔｅ系合金層であり、反射層が厚み１０ｎｍのＡｕ層である場合、光学情報記録媒体１の透過率は約５０％であるので、光学情報記録媒体１に照射されたフラッシュ光１２のほぼ半分が透過する。
【００７５】
図８（ｂ）に示すように、光学情報記録媒体１内に入射したフラッシュ光１２は、その約半分が記録多層膜１６を透過し、さらに保護層２０を透過して、リング状の突起６１ａ及び凹み６２ａ及び６２ｂに達する。リング状の突起６１ａに達したフラッシュ光１２は、その表面により反射され、光記録媒体１内に再入射し、記録多層膜１６に吸収される。一方、凹み６２ａ及び６２ｂに到達したフラッシュ光１２は、そのまま凹み６２ａ及び６２ｂに侵入し、凹み６２ａ及び６２ｂの内部で迷光となり、凹み６２ａ及び６２ｂの内面により吸収又は散乱され、ほとんど光記録媒体１内に再入射しない。従って、フラッシュ光１２のリング状の突起６１ａ上に載置された初期化領域１３ｂへの実質的な入射光量と、凹み６２ａ及び６２ｂ上に位置する外周端近傍領域１３ａと内周端近傍領域１３ｃへの実質的な入射光量に差が生じる。その結果、外周端近傍領域１３ａ及び内周端近傍領域１３ｃでは、熱の拡散性が悪いにもかかわらず、外周端近傍領域１３ａ及び内周端近傍領域１３ｃの温度は初期化領域１３ｂの温度よりも低くなり、その大部分は初期化されない。また、熱歪みも小さく、クラックやシワは発生しない。なお、第４の実施例の光学情報記録媒体の初期化装置により光学情報記録媒体１の全面にフラッシュ光１２を照射した場合の、光学情報記録媒体１の半径方向に温度分布は、図７に示す第３の実施例の場合と同様である。
【００７６】
なお、第４の実施例における光学情報記録媒体１の初期化作業は、光学記録媒体１を支持体２Ｃ上に配置した後、光照射装置１００によりフラッシュ光１２を発光させるだけであり、多数の光学情報記録媒体１を簡単な作業により効率よく初期化を行うことできる。
【００７７】
なお、図９（ａ）に示すように、支持体２Ｃのテーブル２４上にリング状の突起６１ａのみを形成し、中心軸上の円柱状の突起６１ｂを省略してもよい。あるいは、図９（ｂ）に示すように、テーブル２４上のリング状の突起６１ａの中央部を貫通穴６３としてもよい。
【００７８】
【発明の効果】
以上のように、本発明の光学情報記録媒体の初期化方法及び初期化装置の第１の構成では、光学情報記録媒体の外周端及び内周端に隣接するように壁を設けている。また、第２の構成は、光学情報記録媒体を支持するテーブルの表面に、光学情報記録媒体の初期化されるべき初期化領域（第２の領域）に対向する領域の反射率が外周端近傍領域（第１の領域）及び内周端近傍領域（第３の領域）に対向する領域の反射率よりも高くなるように、それぞれ光の反射率が異なる複数の領域を形成している。さらに、第３の構成では、光学情報記録媒体を支持するテーブルの表面のうち、少なくとも第１の領域及び第３の領域に対向する部分に凹部を形成している。そのため、光学情報記録媒体を初期化するためのフラッシュ光の内、光学情報記録媒体の外周端近傍領域及び内周端近傍領域に入射する光量が、初期化されるべき初期化領域に入射する光量よりも少なくなるので、外周端近傍領域及び内周端近傍領域の記録層の大部分を初期化することなく、初期化領域の記録層を初期化することができる。その結果、光学情報記録媒体の初期化領域の記録層が初期化された時点で、外周端近傍領域及び内周端近傍領域における記録層の温度上昇は低く、これらの領域における記録層にはクラックやシワは ほとんど発生しない。
【図面の簡単な説明】
【図１】本発明の光記録媒体の初期化方法の実施に適用する初期化装置の第１の実施例の構成を示す断面斜視図
【図２】（ａ）は図１に示された初期化装置による光学情報記録媒体の初期化状態における符号Ｘで特定した円内の拡大断面図、（ｂ）は光学情報記録媒体１の外周端近傍領域１３ａ、内周端近傍領域１３ｃ及び初期化領域１３ｂの位置関係を示す図
【図３】（ａ）は比較例における光学情報記録媒体１の表面における半径方向の照射強度（入射光量）分布を示す図、（ｂ）は比較例における光学情報記録媒体１半径方向のの温度分布を示す図、（ｃ）は図１に示す第１の実施例の光学情報記録媒体の初期化装置を用いて初期化を行った光学情報記録媒体１の表面における半径方向の照射強度分布を示す図、（ｄ）は図１に示す第１の実施例の光学情報記録媒体の初期化装置を用いて初期化を行った光学情報記録媒体１の半径方向の温度分布を示す図
【図４】第２の実施例の光記録媒体の初期化装置の構成を示す断面斜視図
【図５】図４に示された初期化装置による光学情報記録媒体の初期化状態における符号Ｙで特定した円内の拡大断面図
【図６】（ａ）は第３の実施例の光記録媒体の初期化装置の構成を示す断面斜視図、（ｂ）は（ａ）に示された初期化装置による光学情報記録媒体の初期化状態における符号Ｚで特定した円内の拡大断面図
【図７】図６（ａ）及び（ｂ）に示す第３の実施例の光学情報記録媒体の初期化装置により光学情報記録媒体１の全面にフラッシュ光１２を照射した場合の、光学情報記録媒体１の半径方向に温度分布を示す図
【図８】（ａ）は第４の実施例の光記録媒体の初期化装置の構成を示す断面斜視図、（ｂ）は図８（ａ）に示された初期化装置による光学情報記録媒体の初期化状態における符号Ｖで特定した円内の拡大断面図
【図９】（ａ）は第４の実施例の光記録媒体の初期化装置の別の構成を示す断面斜視図、（ｂ）は第４の実施例の光記録媒体の初期化装置のさらに別の構成を示す断面斜視図
【図１０】従来の光記録媒体の初期化装置の構成を示す断面斜視図
【符号の説明】
１ ：光学情報記録媒体
１ａ：嵌合穴
２ ：支持体
２Ａ：支持体
２Ｂ：支持体
２Ｃ：支持体
３ ：凹み
４ ：フラッシュランプ
５ ：メインコンデンサ
６ ：電源
７ ：切り換えスイッチ
８ ：トリガスイッチ
９ ：トリガコイル
１０ ：トリガコンデンサ
１１ ：充電抵抗
１２ ：フラッシュ光
１３ａ：外周端近傍領域
１３ｂ：初期化領域
１３ｃ：内周端近傍領域
１４ ：枠体
１４ａ：底板
１５ ：突起
１６ ：記録多層膜
１７ ：閃光駆動回路
１８ ：テーブル
１９ ：基板
２０ ：表面保護層
２１ ：調節機構
２１ａ：おねじ
２２ ：テーブル
２３ ：テーブル
２３ａ：テーブルの上面
３０ ：衝立部材
３１ ：突起
４３ ：低光反射部
４４ ：高光反射部
６１ａ：突起
６１ｂ：突起
６２ａ：凹み
６２ｂ：凹み
６３ ：貫通穴
１００ ：光照射装置[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an initialization method and an initialization apparatus for an optical information recording medium having a recording layer whose optical characteristics are changed by irradiation with a laser beam or the like formed on a substrate.
[0002]
[Prior art]
Generally, as an initialization method for an optical information recording medium including a phase change optical recording medium and a magneto-optical recording medium, flash light is collectively irradiated onto the entire recording surface of the optical information recording medium. In the initialization of the optical information recording medium using flash light, the entire surface of the optical information recording medium can be initialized at once, and the time required for initialization (crystallization) is 1 to 2 ms. In the phase change optical recording medium, since normal data recording is performed by changing each region of the recording thin film layer from a crystalline state to an amorphous state, the entire recording region of the recording thin film layer is previously crystallized before recording. This is called initialization. On the other hand, in a magneto-optical recording medium, aligning the back magnetization direction of the recording thin film layer before recording is called initialization.
[0003]
However, for example, when the entire surface of a disk-shaped optical information recording medium is initialized by flash light irradiation, cracks and wrinkles occur in the recording layer and the like near the outer peripheral edge and the inner peripheral edge of the optical information recording medium. There is a case. The following can be considered as the cause.
[0004]
When the recording layer of the optical information recording medium absorbs flash light, the temperature of the recording layer rises rapidly. Usually, a reflective layer made of metal is formed on the recording layer, and the thermal conductivity of the recording layer and the reflective layer is higher than the thermal conductivity of the substrate and the protective layer, so the heat generated in the recording layer passes through them. Spread around. However, since there is no recording layer outside the outer peripheral edge and inside the inner peripheral edge of the optical information recording medium and is open, heat dissipation is limited in the area near the outer edge and the area near the inner edge. For this reason, the temperature of the recording layer in the region near the outer peripheral end and the region near the inner peripheral end becomes higher than the temperature of the recording layer in the intermediate region, and the thermal load increases. As a result, cracks and wrinkles are generated in the recording layer in the vicinity of the outer peripheral end and the vicinity of the inner peripheral end.
[0005]
In general, the area near the outer peripheral edge and the area near the inner peripheral edge of the optical information recording medium are used as a margin for chucking when mounted on an information recording / reproducing apparatus or the like, and information recording / reproduction is not performed. However, when cracks and wrinkles occur in these areas, moisture and unnecessary substances enter the recording layer from the cracks, which may cause malfunctions in recording and reproducing information in recording layers other than these areas. This causes deterioration of the optical information recording medium.
[0006]
In order to prevent the occurrence of cracks and wrinkles, for example, Japanese Patent Laid-Open No. 1-300439 discloses an initialization of an optical information recording medium that does not initialize an outer peripheral end vicinity area and an inner peripheral end vicinity area of the optical information recording medium. A device has been proposed. A conventional optical information recording medium initialization apparatus that does not initialize the recording layer in the area near the outer peripheral edge and the area near the inner peripheral edge of the optical information recording medium will be described with reference to FIG.
[0007]
In the conventional optical information recording medium initialization apparatus shown in FIG. 10, masks 81 and 82 are placed on the disk-shaped optical information recording medium 1 on the support 80, and the optical light out of the light emitted from the flash lamp 4 is optical. The incident light to the area near the outer peripheral end and the area near the inner peripheral end of the information recording medium 1 is shielded. As a result, the outer peripheral edge vicinity area and the inner peripheral edge vicinity area are not initialized, the temperature rise of the recording layer in these areas is reduced, and the generation of cracks and wrinkles is prevented.
[0008]
Note that the area near the inner peripheral edge of the optical information recording medium 1 has a margin with respect to the area where information is actually recorded, so that some cracks and wrinkles may be allowed to occur. For this reason, when the generation of cracks and wrinkles in the recording layer in the region near the inner peripheral edge of the optical information recording medium 1 is acceptable, the mask 82 is omitted so as to cover the region near the inner peripheral edge of the optical information recording medium 1. Also good.
[0009]
[Problems to be solved by the invention]
However, when the optical information recording medium is initialized using the conventional initialization apparatus shown in FIG. 10, the masks 81 and 82 must be placed for each optical information recording medium 1, and the positioning thereof is performed. Is difficult. Therefore, for example, when initializing a large number of optical information recording media in an optical information recording medium production line or the like, there is a problem that work efficiency is poor and productivity is low.
[0010]
The present invention has been made in order to solve the above-described problems of the conventional example. By simple operation, only the other part of the optical information recording medium excluding the region near the outer peripheral edge is initialized, and the optical information recording medium is obtained. It is an object of the present invention to provide an initialization method and an initialization device that can prevent the occurrence of cracks and wrinkles in the vicinity of the end of the substrate.
[0011]
[Means for Solving the Problems]
Of the present inventionOf the first configurationThe optical information recording medium initialization method is a method of initializing an optical information recording medium having a recording layer whose optical properties change by light irradiation by flash light irradiation, and supports the optical information recording medium. The amount of the flash light incident on at least the first region in the vicinity of the outer peripheral portion of the optical information recording medium is set to a support for performing the above operation on the intermediate portion between the inner peripheral portion and the outer peripheral portion of the optical information recording medium. Incident light amount adjusting means for reducing the amount of incident flash light to the area 2As provided along the outer periphery of the optical information recording medium supported by the support, a wall higher than the thickness of the optical information recording medium protruding to the light source side of the flash light,In a state where the optical information recording medium is supported by the support, flash light is irradiated toward the entire surface of the optical information recording medium to initialize at least the second area.
[0013]
Formed as a means to adjust the amount of incident lightDue to the presence of the wall, a part of the light incident obliquely on the first area near the outer periphery of the optical information recording medium is blocked, and the amount of light incident on the first area is larger than the amount of light incident on the second area. Less. As a result, the temperature rise of the recording layer in the first area at the time when at least the second area is initialized can be reduced, and the occurrence of cracks and wrinkles in the recording layer in the first area can be prevented. be able to. Further, when the optical information recording medium is placed on the support, the wall functions as a positioning guide, and positioning of the optical information recording medium is facilitated.
[0014]
A method for initializing an optical information recording medium having a second configuration according to the present invention is a method for initializing an optical information recording medium having a recording layer whose optical characteristics are changed by light irradiation, by irradiation with flash light. The amount of the flash light incident on the first region in the vicinity of the outer peripheral portion of the optical information recording medium is set on the support for supporting the optical information recording medium at least with the inner peripheral portion of the optical information recording medium. For reducing the amount of flash light incident on the second region intermediate to the outer peripheral portion.As the incident light amount adjusting means, a plurality of regions having different light reflectivities are formed on the surface of the support on which the optical information recording medium is placed, and the reflectivity of the region facing the second regionTheHigher than the reflectivity of the region facing the first region.Then, with the optical information recording medium supported by the support, flash light is irradiated toward the entire surface of the optical information recording medium to initialize at least the second region..
By making the reflectance of the region facing the second region on the surface of the support higher than the reflectance of the region facing the first region, the light is transmitted through the optical information recording medium and reflected by the support, and is optical again. Regarding the amount of light incident on the information recording medium, the amount of light re-entering the second region is greater than the amount of light re-entering the first region. As a result, the temperature rise of the recording layer in the first area at the time when at least the second area is initialized can be reduced, and the occurrence of cracks and wrinkles in the recording layer in the first area can be prevented. be able to. Further, the optical information recording medium can be positioned using a region having a high reflectance as a mark, and the positioning operation is facilitated.
[0015]
A method for initializing an optical information recording medium having a third configuration according to the present invention is a method for initializing an optical information recording medium having a recording layer whose optical characteristics are changed by light irradiation, by irradiation with flash light. The amount of the flash light incident on the first region in the vicinity of the outer peripheral portion of the optical information recording medium is set on the support for supporting the optical information recording medium at least with the inner peripheral portion of the optical information recording medium. For reducing the amount of flash light incident on the second region intermediate to the outer peripheral portion.Of the surface of the support on which the optical information recording medium is placed as an incident light amount adjusting means, at least a portion facing the first regionIn the state where the recess is formed and the optical information recording medium is supported by the support, the entire surface of the optical information recording medium is irradiated with flash light to initialize at least the second region..
By denting the portion of the support surface facing the first area, the amount of light transmitted through the optical information recording medium and reflected by the support and incident on the optical information recording medium again is re-incident on the second area. The amount of light to be increased is greater than the amount of light that reenters the first region. As a result, it is possible to reduce the temperature rise of the first region at the time when at least the second region is initialized, and to prevent the recording layer from being cracked or wrinkled in the first region. . Further, the optical information recording medium can be positioned using the dent as a mark, and the positioning operation becomes easy.
[0017]
A method for initializing an optical information recording medium having a fourth configuration according to the present invention is a method for initializing an optical information recording medium having a recording layer whose optical characteristics are changed by light irradiation, by irradiation with flash light. The amount of the flash light incident on the support for supporting the optical information recording medium is at least a first region near the outer periphery of the optical information recording medium and a third region near the inner periphery. For reducing the amount of the flash light incident on the second region intermediate between the inner peripheral portion and the outer peripheral portion of the optical information recording medium.As the incident light amount adjusting means, a wall higher than the thickness of the optical information recording medium protruding toward the light source side of the flash light is formed along the outer periphery and inner periphery of the optical information recording medium supported by the support.Then, with the optical information recording medium supported by the support, flash light is applied to the entire surface of the optical information recording medium to initialize at least the second region..
A method for initializing an optical information recording medium of the fifth configuration of the present invention is a method for initializing an optical information recording medium having a recording layer whose optical characteristics change by light irradiation, by irradiation with flash light. The amount of the flash light incident on the support for supporting the optical information recording medium is at least a first region near the outer periphery of the optical information recording medium and a third region near the inner periphery. For reducing the amount of the flash light incident on the second region intermediate between the inner peripheral portion and the outer peripheral portion of the optical information recording medium.As the incident light amount adjusting means, a plurality of regions having different light reflectance are formed on the surface of the support on which the optical information recording medium is placed, and the reflectance of the region facing the second region is the first. Higher than the reflectivity of the region 1 and the region facing the third regionMake.
A method for initializing an optical information recording medium having a sixth configuration of the present invention is a method for initializing an optical information recording medium having a recording layer whose optical characteristics change by light irradiation, by irradiation with flash light. The amount of the flash light incident on the support for supporting the optical information recording medium is at least a first region near the outer periphery of the optical information recording medium and a third region near the inner periphery. For reducing the amount of the flash light incident on the second region intermediate between the inner peripheral portion and the outer peripheral portion of the optical information recording medium.Of the surface of the support on which the optical information recording medium is placed, at least a portion facing the first region and the third region is concave as the incident light amount adjusting means.Do.
With these configurations, the amount of light incident on the first region and the third region is smaller than the amount of light incident on the second region, and at least the first region at the time when the second region is initialized and The temperature rise of the recording layer in the third region can be reduced, and the occurrence of cracks and wrinkles in the recording layer in the first region and the third region can be prevented.
[0020]
On the other hand, the optical information recording medium initialization apparatus of the first configuration of the present invention is an optical information recording medium initialization apparatus provided with a recording layer whose optical characteristics change by light irradiation. A support for supporting the medium; and an amount of the flash light incident on a first region near the outer periphery of the optical information recording medium at least in the center of the optical information recording medium. And the optical information recording medium in a state in which the optical information recording medium is supported by the support, and the optical information recording medium is supported by the support. A flash light source that irradiates flash light toward the entire surface of the recording medium,The incident light amount adjusting means is a wall higher than the thickness of the optical information recording medium protruding toward the light source side of the flash light along the outer periphery of the optical information recording medium supported by the support.The
This wall blocks a part of the light incident obliquely on the first area near the outer periphery of the optical information recording medium, and the amount of light incident on the first area is less than the amount of light incident on the second area. Become. As a result, the temperature rise of the recording layer in the first region at the time when at least the second region is initialized can be reduced, and cracks and wrinkles of the recording layer in the first region can be prevented. be able to. Further, when the optical information recording medium is placed on the support, the wall functions as a positioning guide, and positioning of the optical information recording medium is facilitated.
[0021]
Furthermore, it is preferable to have adjusting means for adjusting the height of the wall. In particular, it is preferable that the incident light amount adjusting means is a substantially cylindrical frame body, and the support body includes the frame body and a table movable in parallel with a central axis of the frame body.
By adjusting the height of the wall, it is possible to adjust a range in which light obliquely incident on the first region is blocked by the wall. As a result, a plurality of types of optical information recording media having different thicknesses and structures can be initialized with the same apparatus. In addition, since the height of the wall can be finely adjusted after the optical information recording medium is placed on the support, it is possible to accurately distinguish the area to be initialized from the area to prevent the occurrence of cracks and the like. .
[0022]
An optical information recording medium initialization apparatus according to a second configuration of the present invention is an optical information recording medium initialization apparatus provided with a recording layer whose optical characteristics are changed by light irradiation. A support for supporting, and an amount of the flash light incident on a first region near at least an outer peripheral portion of the optical information recording medium provided on the support, and a central portion of the optical information recording medium and the The optical information recording medium in a state in which the incident light amount adjusting means for making the incident amount of the flash light smaller than the incident amount of the flash light to the second region intermediate from the end portion and the optical information recording medium supported by the support A flash light source that irradiates flash light toward the entire surface,The incident light amount adjusting means is a frame having an inner peripheral portion that fits with an outer peripheral portion of an optical information recording medium placed on a table-like support.The
With such a configuration, the frame can be placed at an arbitrary position on the flat support, and the optical information recording medium can be easily positioned using the frame as a guide.
In particular, by making the surface area of the support and the irradiation area of the flash light source much larger than the size of the optical information recording medium, a large number of optical information recording media can be initialized at once.
[0023]
UpStructureThe height of the wall is d, the height from the table surface of the support to the recording layer in the optical information recording medium is h, the distance from the center of the optical information recording medium to the outer peripheral edge is A, It is preferable that d ≧ h + (A−a) is satisfied, where a is the distance from the center of the optical information recording medium to the outer peripheral edge of the second region to be initialized.
By satisfying this condition, there is a practically sufficient initialization area (second area) for recording information, and there is no crack or wrinkle in the recording layer in the vicinity of the outer peripheral part (first area). An optical information recording medium is obtained.
[0024]
An optical information recording medium initialization apparatus according to a third configuration of the present invention is an optical information recording medium initialization apparatus provided with a recording layer whose optical characteristics are changed by light irradiation. A support for supporting, and an amount of the flash light incident on a first region near at least an outer peripheral portion of the optical information recording medium provided on the support, and a central portion of the optical information recording medium and the The optical information recording medium in a state in which the incident light amount adjusting means for making the incident amount of the flash light smaller than the incident amount of the flash light to the second region intermediate from the end portion and the optical information recording medium supported by the support A flash light source that irradiates flash light toward the entire surface,The incident light amount adjusting means includes a plurality of regions having different reflectances of light formed on a surface of the support on which the optical information recording medium is placed, and is a region facing the second region. The reflectance is higher than the reflectance of the region facing the first region.Consists of things.
In particular, of the surface of the support on which the optical information recording medium is installed, a region facing the second region is subjected to a mirror surface treatment, and a region facing the first region is blackened or It is preferable that a roughening treatment is performed.
[0025]
By making the reflectance of the region facing the second region on the surface of the support higher than the reflectance of the region facing the first region, the light is transmitted through the optical information recording medium and reflected by the support, and is optical again. Regarding the amount of light incident on the information recording medium, the amount of light re-entering the second region is greater than the amount of light re-entering the first region. As a result, the temperature rise of the recording layer in the first area at the time when at least the second area is initialized can be reduced, and the occurrence of cracks and wrinkles in the recording layer in the first area can be prevented. be able to. In addition, the optical information recording medium can be positioned using a region having a high reflectivity that has been subjected to the mirror finishing process as a mark, and positioning work is facilitated.
[0026]
An optical information recording medium initialization apparatus according to a fourth aspect of the present invention is an optical information recording medium initialization apparatus including a recording layer whose optical characteristics change by light irradiation. A support for supporting, and an incident amount of the flash light to at least a first region in the vicinity of an outer peripheral portion of the optical information recording medium provided on the support, and a central portion of the optical information recording medium and the The optical information recording medium in a state in which the incident light amount adjusting means for making the incident amount of the flash light smaller than the incident amount of the flash light to the second region intermediate from the end portion and the optical information recording medium supported by the support A flash light source that irradiates flash light toward the entire surface,The incident light amount adjusting means is a recess formed in at least a portion of the surface of the support on which the optical information recording medium is placed facing the first region.The
In particular, it is preferable that a region facing the second region of the surface of the support on which the optical information recording medium is installed is mirror-finished. Furthermore, it is preferable that a blackening process or a roughening process is performed on the inner surface of the recess.
[0027]
By denting the portion of the support surface facing the first area, the amount of light transmitted through the optical information recording medium and reflected by the support and incident on the optical information recording medium again is re-incident on the second area. The amount of light to be increased is greater than the amount of light that reenters the first region. As a result, the temperature rise of the recording layer in the first area at the time when at least the second area is initialized can be reduced, and the occurrence of cracks and wrinkles in the recording layer in the first area can be prevented. be able to. Further, the optical information recording medium can be positioned using the dent as a mark, and the positioning operation becomes easy.
[0029]
An optical information recording medium initialization apparatus according to a fifth configuration of the present invention is an optical information recording medium initialization apparatus provided with a recording layer whose optical characteristics are changed by light irradiation. A support for supporting, and an amount of the flash light incident on at least a first region near the outer periphery of the optical information recording medium and a third region near the inner periphery provided on the support, Incident light quantity adjusting means for making the incident amount of the flash light smaller than the incident amount of the flash light to the second region intermediate between the central portion and the end portion of the optical information recording medium, and the optical information recording medium by the support A flash light source that emits flash light toward the entire surface of the optical information recording medium in a supported state;The incident light amount adjusting means is a wall higher than the thickness of the optical information recording medium protruding toward the light source side of the flash light along the outer periphery and inner periphery of the optical information recording medium supported by the support. AhThe
PreviousIt is preferable to have adjusting means for adjusting the height of the recording wall.
An optical information recording medium initialization apparatus according to a sixth configuration of the present invention is an optical information recording medium initialization apparatus provided with a recording layer whose optical characteristics are changed by light irradiation. A support for supporting, and an amount of the flash light incident on at least a first region near the outer periphery of the optical information recording medium and a third region near the inner periphery provided on the support, Incident light amount adjusting means for making the incident amount of the flash light smaller than the incident amount of the flash light to the second region intermediate between the central portion and the end portion of the optical information recording medium, and the optical information recording medium by the support A flash light source that emits flash light toward the entire surface of the optical information recording medium in a supported state;The incident light amount adjusting means is a substantially cylindrical frame and a projection provided on the central axis of the frame, and the support moves parallel to the frame, the projection and the central axis of the frame. Contains possible tablesMu
[0030]
An optical information recording medium initialization apparatus according to a seventh configuration of the present invention is an optical information recording medium initialization apparatus including a recording layer whose optical characteristics change by light irradiation. A support for supporting, and an amount of the flash light incident on at least a first region near the outer periphery of the optical information recording medium and a third region near the inner periphery provided on the support, Incident light amount adjusting means for making the incident amount of the flash light smaller than the incident amount of the flash light to the second region intermediate between the central portion and the end portion of the optical information recording medium, and the optical information recording medium by the support A flash light source that emits flash light toward the entire surface of the optical information recording medium in a supported state;The incident light amount adjusting means includes a frame having an inner peripheral portion that fits with an outer peripheral portion of an optical information recording medium placed on a table-like support, and an inner peripheral portion of the optical information recording medium. A protrusion having a peripheral partThe
The height of the wall is d, the height from the table surface of the support to the recording layer in the optical information recording medium is h, the distance from the center of the optical information recording medium to the outer peripheral edge is A, the It is preferable that d ≧ h + (A−a) be satisfied, where a is the distance from the center of the optical information recording medium to the outer peripheral edge of the second region to be initialized.
[0031]
An optical information recording medium initialization apparatus according to an eighth aspect of the present invention is an optical information recording medium initialization apparatus including a recording layer whose optical characteristics change by light irradiation. A support for supporting, and an amount of the flash light incident on at least a first region near the outer periphery of the optical information recording medium and a third region near the inner periphery provided on the support, Incident light amount adjusting means for making the incident amount of the flash light smaller than the incident amount of the flash light to the second region intermediate between the central portion and the end portion of the optical information recording medium, and the optical information recording medium by the support A flash light source that emits flash light toward the entire surface of the optical information recording medium in a supported state;The incident light amount adjusting means includes a plurality of regions having different reflectances of light formed on a surface of the support on which the optical information recording medium is placed, and is a region facing the second region. The reflectivity is higher than the reflectivity of the region facing the first region and the third region.Composed of.
Moreover, the area | region which opposes the said 2nd area | region among the surfaces where the said optical information recording medium of the said support body is installed is mirror-finished, and is an area | region which opposes the said 1st area | region and a 3rd area | region. Is preferably blackened or roughened.
[0032]
An optical information recording medium initialization apparatus according to a ninth configuration of the present invention is an optical information recording medium initialization apparatus provided with a recording layer whose optical characteristics are changed by light irradiation. A support for supporting, and an amount of the flash light incident on at least a first region near the outer periphery of the optical information recording medium and a third region near the inner periphery provided on the support, Incident light amount adjusting means for making the incident amount of the flash light smaller than the incident amount of the flash light to the second region intermediate between the central portion and the end portion of the optical information recording medium, and the optical information recording medium by the support A flash light source that emits flash light toward the entire surface of the optical information recording medium in a supported state;The incident light amount adjusting means is a recess formed in at least a portion of the surface of the support on which the optical information recording medium is placed, facing the first region and the third region.The
Moreover, it is preferable that the area | region which opposes a said 2nd area | region among the surfaces where the said optical information recording medium of the said support body is installed is mirror-finished.
Moreover, it is preferable that the inner surface of the concave portion is subjected to blackening treatment or roughening treatment.
[0033]
(First embodiment)
An optical information recording medium initialization method and initialization apparatus according to a first embodiment of the present invention will be described. FIG. 1 is a cross-sectional perspective view showing the configuration of the optical recording medium initialization apparatus of the first embodiment. FIG. 2A is an enlarged cross-sectional view in a circle identified by the symbol X in the initialization state of the optical information recording medium by the initialization apparatus shown in FIG. FIG. 2B is a diagram showing the positional relationship between the outer peripheral end vicinity region 13a, the inner peripheral end vicinity region 13c, and the initialization region 13b of the optical information recording medium 1.
[0034]
As shown in FIG. 1, the support 2 includes a substantially cylindrical frame 14, a protrusion 15 provided on the central axis of the frame 14, and a ring-shaped recess between the frame 14 and the protrusion 15. 3 and a ring-shaped table 18 that moves up and down in the direction of the central axis of the frame body 14 and an adjustment mechanism for adjusting the depth of the recess 3, that is, the height of the wall by the frame body 14 and the projection 15. 21 etc. Since the adjusting mechanism 21 is provided on the bottom plate 14a of the frame body 14, the adjusting mechanism 21 includes a screw and a male screw 21a that is screwed with a female screw.
[0035]
Various materials such as metal and resin can be used as the material of the support 2. In particular, it is desirable to use stainless steel, carbon steel, copper, copper alloy, brass, aluminum, aluminum alloy, etc. excellent in shape stability and weather resistance.
[0036]
As shown in FIG. 2B, the optical information recording medium 1 has a ring shape or a disk shape having a fitting hole 1a for chucking in the central portion. In the optical information recording medium 1, an outer peripheral end vicinity region (first region) 13a in the range of about 1 to 2 mm from the outer peripheral end and an inner peripheral end region (third region) in the range of about 10 to 15 mm from the inner peripheral end. The area 13c is a so-called margin part where information is not recorded, and does not necessarily have to be initialized. An initialization area (second area) 13b between these areas is a portion where information is recorded, and needs to be initialized. The inner diameter of the frame 14 is larger than the outer diameter D of the optical information recording medium 1 by a predetermined fitting tolerance. Further, the outer diameter of the protrusion 15 is smaller than the diameter of the fitting hole 1 a at the center of the optical information recording medium 1 by a predetermined fitting tolerance. Therefore, when the optical information recording medium 1 is placed on the ring-shaped table 18, it hardly moves and is positioned with extremely high accuracy.
[0037]
As shown in FIG. 2A, the optical information recording medium 1 includes a recording multilayer film 16 in which a protective layer, a recording layer, and a reflective layer are sequentially laminated on a substrate 19, and a surface protective layer formed on the recording multilayer film 16. 20 is comprised. The substrate 19 is made of a resin such as PMMA (polymethyl methacrylate) and polycarbonate, or a material such as glass. Of the recording multilayer film 16, the protective layer is a nitride such as SiN or AlN, TiO.2  , SiO2  Oxides such as ZnS, sulfides such as ZnS, or ZnS-SiO2  It consists of mixed materials. The recording layer is made of an optical phase change material such as Ge—Sb—Te-based material or a magneto-optical material such as Fe—Tb—Co-based material. The reflective layer is made of a metal element such as Au, Al, Ni, Cr, or an alloy containing these metals as a main component. The surface protective layer 20 is made of a resin plate or glass plate similar to a resin layer obtained by spin-coating a resin or a substrate bonded to the reflective layer surface using an adhesive.
[0038]
As a form of the optical information recording medium as a completed product, the optical information recording medium 1 itself having the above-described configuration, which records, reproduces and erases information from one side, is also used. The information recording medium 1 may be one in which the reflective layers are bonded together with an adhesive directly or through an intermediate substrate, and information is recorded, reproduced and erased from both sides. When the recording layer of the optical information recording medium 1 is formed of a magneto-optical material such as an Fe—Te—Co-based material, a magnetic field for orienting the magnetization direction of the magneto-optical material in a certain direction. Generation means (not shown) are used.
[0039]
As shown in FIG. 1, the light irradiation device 100 includes a flash lamp 4 and a flash drive circuit 17 connected in parallel with the terminals of the flash lamp 4. The effective light emission length L of the flash lamp 4 is selected to be longer than the diameter D of the optical information recording medium 1. In FIG. 1, only one linear flash lamp 4 is arranged. However, a plurality of flash lamps 4 may be selected according to the shape and area of the optical information recording medium to be initialized, the number of optical information recording media to be initialized at the same time, and the like. These linear lamps may be arranged in parallel, or a spiral flash lamp may be used. That is, the area of the light irradiation region by the light irradiation device 100 needs to be larger than the area of the optical information recording medium 1 to be initialized.
[0040]
The flash drive circuit 17 includes a main capacitor 5 that stores electrical energy necessary for flashing the flash lamp 4, a power source 6 for charging the main capacitor 5, charging, blocking, and overcharging of the main capacitor 5. A switch 7 for switching discharge, a trigger switch 8 for causing discharge between the cathode and the anode of the flash lamp 4, a trigger coil 9, a trigger capacitor 10, and the like are included. A voltage Vtr is applied to the trigger capacitor 10 through the charging resistor 11 in advance.
[0041]
When the trigger switch 8 of the flash drive circuit 17 of the light irradiation device 100 is closed, the energy stored in the trigger capacitor 10 is converted into high frequency / high voltage energy by the trigger coil 9 and applied to the trigger electrode of the flash lamp 4. The By this high frequency / high voltage, the xenon gas inside the flash lamp 4 is ionized, and a rapid discharge is started between the cathode and the anode. As a result, the energy stored in the main capacitor 5 is converted into light energy, the flash lamp 4 emits light instantaneously, and the flash light 12 generated by this light emission is irradiated onto the surface of the optical information recording medium 1. For example, when a plurality of linear flash lamps 4 are arranged in parallel, the flash light 12 is emitted from each flash lamp 4 in all directions.
[0042]
Next, the operation of the optical information recording medium initialization apparatus of the first embodiment shown in FIG. 1, that is, the optical information recording medium initialization method of the first embodiment will be described.
First, the disc-shaped optical recording medium 1 is placed on the table 18 of the support 2. Here, by adjusting the adjustment mechanism 21 in advance, the depth of the recess 3 (or the height of the wall by the frame body 14 and the projection 15) is deeper (or higher) than the thickness of the optical information recording medium 1. Is set.
[0043]
The surface of the optical information recording medium 1 is far from the flash lamp 4, that is, in a recessed position as compared with the surfaces of the frame body 14 and the protrusion 15. On the other hand, the flash light 12 from the flash lamp 4 includes not only a component incident at a right angle to the surface of the optical information recording medium 1 but also a component incident obliquely. Therefore, as shown in FIG. 2A, a part of the flash light 12 incident obliquely on the surface of the optical information recording medium 1 is blocked by the wall of the frame body 14 and the protrusion 15. Of the optical information recording medium 1, the amount of incident light on the outer peripheral end vicinity region 13a adjacent to the frame 14 and the inner peripheral end vicinity region 13c adjacent to the protrusion 15 is the amount of incident light on the initialization region 13b between these regions. Less than The initialization area 13b, which is the majority of the optical information recording medium 1, receives the energy necessary for initialization by the irradiation of the flash light 12, and is initialized. However, when the initialization area 13b is initialized, the outer peripheral edge vicinity area 13a and the inner peripheral edge vicinity area 13c are not initialized because they do not receive energy necessary for initialization, and the temperature of the recording layer also increases. small. As a result, it is possible to prevent occurrence of cracks and wrinkles in the recording layer in the outer peripheral end vicinity region 13a and the inner peripheral end vicinity region 13c.
[0044]
As a comparative example, the optical information recording medium 1 was initialized by irradiating the entire surface of the optical information recording medium 1 with the flash light 12 without using the support 2. At this time, the irradiation intensity (incident light quantity) distribution in the radial direction on the surface of the optical information recording medium 1 is shown in FIG. 3A, and the temperature distribution in the radial direction of the optical information recording medium 1 is shown in FIG. FIG. 3C shows the radial irradiation intensity distribution on the surface of the optical information recording medium 1 that has been initialized using the optical information recording medium initialization apparatus of the first embodiment shown in FIG. The temperature distribution in the radial direction of the optical information recording medium 1 is shown in FIG.
[0045]
As shown in FIG. 3A, since the support 2 is not used in the comparative example, the entire surface of the optical information recording medium 1 is irradiated with the flash light 12 uniformly, and the outer peripheral edge vicinity region 13a and the inner peripheral edge are irradiated. The irradiation intensity in the vicinity area 13c is equal to the irradiation intensity in the initialization area 13b. The flash light 12 has energy necessary for converting the recording layer of the optical information recording medium 1 into a crystalline state. Accordingly, not only the initialization area 13b but also the temperature of the recording layer in the outer peripheral edge vicinity area 13a and the inner peripheral edge vicinity area 13c of the optical information recording medium 1 rapidly rises above the initialization temperature due to the irradiation of the flash light 12. To do. As described above, the heat generated in the recording layer diffuses to the surroundings through the recording layer, the reflective layer, and the like, but the recording layer and the reflective layer are located outside the outer peripheral edge vicinity region 13a and inside the inner peripheral edge vicinity region 13c. Since it does not exist, the direction of heat diffusion is limited, and heat is accumulated. Therefore, as shown in FIG. 3B, the temperature of the outer peripheral end vicinity region 13a and the inner peripheral end vicinity region 13c is higher than the temperature of the initialization region 13b, and the outer peripheral end vicinity region 13a and the inner peripheral end vicinity region 13c. In this case, thermal distortion increases, and cracks and wrinkles occur in the recording layer and the reflective layer.
[0046]
On the other hand, as shown in FIG. 3C, in the case of the optical information recording medium 1 that has been initialized using the optical information recording medium initialization apparatus of the first embodiment shown in FIG. Due to the function of adjusting the amount of incident light to the outer peripheral end vicinity region 13a and the inner peripheral end vicinity region 13c of the optical information recording medium 1, the irradiation intensity in the outer peripheral end vicinity region 13a and the inner peripheral end vicinity region 13c is the irradiation intensity in the initialization region 13b. Is smaller than Due to the irradiation with the flash light 12, the temperature of the initialization region 13b rapidly rises above the initialization temperature. However, since the irradiation intensity of the outer peripheral edge vicinity area 13a and the inner peripheral edge vicinity area 13c is smaller than the irradiation intensity of the initialization area 13b, the temperature rise in the outer peripheral edge vicinity area 13a and the inner peripheral edge vicinity area 13c is small. Therefore, as shown in FIG. 3 (d), the outer peripheral end vicinity region 13a and the inner peripheral end vicinity region 13c have a low heat diffusibility, but the outer peripheral end vicinity region 13a and the inner peripheral end vicinity region 13c. The temperature is lower than the temperature of the initialization region 13b, and most of the temperature is not initialized. Further, the thermal strain is small, and no cracks or wrinkles are generated in the recording layer or the like.
[0047]
The outer peripheral edge vicinity area 13a and the inner peripheral edge vicinity area 13c of the optical information recording medium 1 are usually margin areas that are not used in actual information recording / reproduction. Therefore, there is no problem even if such an area is in an uninitialized state.
[0048]
Next, the depth of the recess 3 in the support 2, that is, the height of the wall formed by the frame body 14 and the protrusion 15 will be examined. As described above, the position of the table 18 on which the optical information recording medium 1 is placed can be adjusted by the adjusting mechanism 21. By adjusting the position of the table 18, the height of the wall by the frame body 14 and the protrusion 15 can be adjusted. Further, by adjusting the height of the wall formed by the frame body 14 and the protrusion 15, the width of the region where the amount of incident light on the optical information recording medium 1 is adjusted can be changed.
[0049]
In this embodiment, since the optical information recording medium 1 has a disk shape, the height of the wall by the frame body 14 and the projection 15 is d, and the distance from the surface of the table 18 to the recording multilayer film 16 in the optical information recording medium 1 is as follows. It is preferable to satisfy d ≧ h + (A−a) where h is the height (or the thickness of the protective layer 20), A is the radius of the optical information recording medium 1, and a is the outermost peripheral radius of the initialization region 13b. . Within the range that satisfies this condition, the higher the wall height d is, the more light rays that are obliquely incident on the outer peripheral edge vicinity region 13a of the optical information recording medium 1 are blocked. The effect of adjusting the amount of incident light is exhibited. The thickness h of the protective layer 20 and the radius A of the optical information recording medium 1 are unique to the optical information recording medium 1 and are fixed. Therefore, if the wall height d is simply increased, the desired outermost radius a of the initialization region 13b may not be obtained. The same applies to the inner peripheral edge vicinity region 13c of the optical information recording medium 1.
[0050]
As described above, by using the optical information recording medium initialization apparatus of the first embodiment shown in FIG. 1, the flash light 12 to the outer peripheral end vicinity region 13a and the inner peripheral end vicinity region 13b of the optical information recording medium 1 is used. The amount of incident light on the recording layer can be adjusted to be smaller than the amount of incident light on the initialization area 13b, so that an excessive increase in the temperature of the recording layer in the outer peripheral edge vicinity area 13a and the inner peripheral edge vicinity area 13b can be suppressed. Only the initialization region 13b can be initialized while preventing the generation of cracks and wrinkles. Further, the light shielding mask and its positioning step as in the conventional initialization apparatus shown in FIG. 10 are not required, and the time required for initialization of the optical information recording medium can be greatly shortened. Further, the initialization work itself is only a simple work of emitting the flash light 12 by the light irradiation device 100 after the optical information recording medium 1 is placed on the table 18 of the support 2, and a large amount of optical information. The recording medium 1 can be initialized efficiently in a short time.
[0051]
In the optical information recording medium initialization apparatus of the first embodiment shown in FIG. 1, the height of the frame body 14 and the protrusion 15 of the support 2 is the same, but the present invention is not limited to this. . For example, if the width of the inner peripheral edge vicinity region 13 c of the optical information recording medium 1 is wider than the outer peripheral edge vicinity region 13 a, the height of the protrusion 15 is set to be higher than the height of the frame body 14. Good. The same applies to the reverse case.
[0052]
In the optical information recording medium initialization apparatus of the first embodiment shown in FIG. 1, both the frame body 14 and the protrusion 15 are provided on the support 2, but in the vicinity of the inner peripheral edge of the optical information recording medium 1. Since the area 13c is normally used as a chucking portion when the optical information recording medium 1 is mounted on a recording apparatus, the actual recording area of the optical information recording medium 1 is often away from the inner peripheral edge. Therefore, even if a crack or a wrinkle occurs in the inner peripheral edge vicinity region 13c of the optical information recording medium 1, since the influence of deteriorating the quality of the signal recorded on the optical information recording medium 1 is small, the protrusion 15 is omitted. May be.
[0053]
In this embodiment, a disc-shaped optical information recording medium 1 is used. However, the present invention is not limited to this, and when the optical information recording medium 1 is in the form of a card, a sheet, or a film, a support is used. The cross-sectional shapes of the two frame bodies 14 and the protrusions 15 may be matched with the shapes of these optical information recording media.
[0054]
(Second embodiment)
A second embodiment of the optical information recording medium initialization method and initialization apparatus of the present invention will be described. FIG. 4 is a cross-sectional perspective view showing the configuration of the optical recording medium initialization apparatus of the second embodiment. FIG. 5 is an enlarged cross-sectional view in a circle identified by the symbol Y in the initialization state of the optical information recording medium by the initialization apparatus shown in FIG. The same reference numerals as those in the first embodiment shown in FIGS. 1 and 2A indicate the same or corresponding parts.
[0055]
As shown in FIG. 4, the support 2 </ b> A includes a flat table 22, a ring-shaped partition member (or frame body) 30 provided on the table 22, and a columnar protrusion provided at the center of the partition member 30. It consists of 31 grades.
[0056]
The optical information recording medium 1 has a ring shape or a disk shape having a chucking hole in the center, and the inner diameter of the partition member 30 is larger than the outer diameter of the optical information recording medium 1 by a predetermined fitting tolerance. Further, the outer diameter of the protrusion 31 is smaller than the diameter of the fitting hole at the center of the optical information recording medium 1 by a predetermined fitting tolerance. Therefore, when the optical information recording medium 1 is placed on the table 22, it hardly moves and is positioned with extremely high accuracy. The illumination device 100 is the same as that of the first embodiment shown in FIG.
In addition, the initialization method of the optical information recording medium of the second embodiment is substantially the same as the initialization method of the first embodiment, and the description thereof is omitted.
[0057]
The irradiation intensity distribution in the radial direction on the surface of the optical information recording medium 1 that has been initialized using the optical information recording medium initialization apparatus of the second embodiment shown in FIG. 4 is the same as in the first embodiment. 3 (c), and the temperature distribution in the radial direction of the optical information recording medium 1 is as shown in FIG. 3 (d). That is, as shown in FIGS. 4 and 5, the partition member 30 and the projection 31 are adjacent to the outer peripheral end vicinity region 13 a of the optical information recording medium 1, so that the partition member 30 and the projection 31 are adjacent to the outer peripheral end region. The function of adjusting the amount of incident light to the region 13 c and the inner peripheral edge vicinity region 13 c is achieved, and the flash light 12 incident obliquely from the light irradiation device 100 is blocked by the partition members 30 and the protrusions 31. Therefore, as shown in FIG. 3C, the irradiation intensity in the outer peripheral edge vicinity region 13a and the inner peripheral edge vicinity region 13c is smaller than the irradiation intensity in the initialization region 13b. Therefore, as shown in FIG. 3D, the temperature of the recording layer in the outer peripheral edge vicinity area 13a and the inner peripheral edge vicinity area 13c is lower than the temperature of the initialization area 13b, and most of them are not initialized. Further, the thermal distortion of the recording layer is small, and cracks and wrinkles do not occur.
[0058]
Next, the height of the wall by the partition member 30 and the protrusion 31 in the support 2A will be examined. By preparing various partition members 30 and protrusions 31 having different heights, the width of the region on the optical information recording medium 1 where the amount of incident light is adjusted can be changed.
Also in this embodiment, the optical information recording medium 1 has a disk shape, the height of the wall formed by the partition members 30 and the projections 31 is d, and from the surface of the table 22 to the recording multilayer film 16 in the optical information recording medium 1. It is preferable to satisfy d ≧ h + (A−a) where h is the height (or the thickness of the protective layer 20), A is the radius of the optical information recording medium 1, and a is the outermost peripheral radius of the initialization region 13b. . Within the range that satisfies this condition, the higher the wall height d is, the more the light incident obliquely to the outer peripheral edge vicinity region 13a of the optical information recording medium 1 is blocked. The effect of adjusting the amount of incident light is exhibited. The thickness h of the protective layer 20 and the radius A of the optical information recording medium 1 are unique to the optical information recording medium 1 and are fixed. Therefore, if the wall height d is simply increased, the desired outermost radius a of the initialization region 13b may not be obtained. The same applies to the inner peripheral edge vicinity region 13c of the optical information recording medium 1.
[0059]
In the optical information recording medium initialization apparatus of the second embodiment shown in FIG. 4, the height of the partition member 30 and the protrusion 31 of the support 2A are the same, but the present invention is not limited to this. . For example, if the width of the inner peripheral edge vicinity region 13 c of the optical information recording medium 1 is wider than the outer peripheral edge vicinity region 13 a, the height of the protrusion 31 is made higher than the height of the screen member 30. Good. The same applies to the reverse case.
[0060]
In the optical information recording medium initialization apparatus according to the second embodiment shown in FIG. 4, both the partition member 30 and the protrusion 31 are provided on the support 2A, but in the vicinity of the inner peripheral end of the optical information recording medium 1. Since the area 13c is normally used as a chucking portion when the optical information recording medium 1 is mounted on a recording apparatus, the actual recording area of the optical information recording medium 1 is often away from the inner peripheral edge. Therefore, even if a crack or a wrinkle occurs in the inner peripheral edge vicinity region 13c of the optical information recording medium 1, the quality of the signal recorded on the optical information recording medium 1 is less affected, so the protrusion 31 is omitted. May be.
[0061]
In this embodiment, a disc-shaped optical information recording medium 1 is used. However, the present invention is not limited to this, and when the optical information recording medium 1 is in the form of a card, a sheet, or a film, a support is used. The cross-sectional shapes of the 2A partition member 30 and the protrusion 31 may be matched with the shapes of these optical information recording media.
[0062]
(Third embodiment)
A third embodiment of the optical information recording medium initialization method and initialization apparatus of the present invention will be described. FIG. 6A is a cross-sectional perspective view showing the configuration of the optical recording medium initialization apparatus of the third embodiment, and FIG. 6B is the initialization apparatus shown in FIG. It is an expanded sectional view in the circle specified with the code Z in the initialization state of the optical information recording medium. The same reference numerals as those in the first embodiment shown in FIGS. 1 and 2A indicate the same or corresponding parts.
[0063]
As shown in FIG. 6A, the support 2B includes a flat table 23, a low light reflecting portion 43, a high light reflecting portion 44, and the like formed on the upper surface 23a of the table 23. The low light reflection portion 43 and the high light reflection portion 44 are formed in a ring shape corresponding to the shape of the disk-shaped optical information recording medium 1. The illumination device 100 is the same as that of the first embodiment shown in FIG.
[0064]
The low light reflecting portion 43 is a portion having a light reflectance lower than the light reflectance of the material of the table 23 itself. For example, when the table 23 is made of metal, the surface is oxidized to form a black metal oxide film. As a specific example, when the material of the table 23 is aluminum, black alumite treatment is performed. Alternatively, a black heat resistant paint may be applied to the surface of the table 23. Further, the surface of the table 23 may be sandblasted to form a satin finish.
[0065]
On the other hand, the high light reflecting portion 44 is a portion having a higher reflectance than the reflectance of the light of the material of the table 23 itself. For example, when the table 23 is a metal, it is processed so as to have a metallic luster by polishing or buffing, or is subjected to a plating process. Moreover, when the table 23 is comprised with materials other than a metal, you may affix the metal film which performed the mirror surface process, for example.
[0066]
The low light reflecting portion 43 is formed on the upper surface 23a of the table 23 in a portion where the outer peripheral end vicinity region 13a and the inner peripheral end vicinity region 13c of the optical information recording medium 1 are disposed. Further, the high light reflection portion 44 is formed in a portion of the upper surface 23a of the table 23 where the initialization region 13b of the optical information recording medium 1 is disposed.
[0067]
Next, an initialization method for the optical information recording medium of the third embodiment will be described. First, as shown in FIG. 6A, the optical information recording medium 1 is placed on the upper surface 23a of the table 23 of the support 2B. At this time, the outer peripheral edge vicinity region 13a and the inner peripheral edge vicinity region 13c of the optical information recording medium 1 are placed on the low light reflection portion 43, and the initialization region 13b is placed on the high light reflection portion 44. Perform positioning. Next, the entire surface of the optical information recording medium 1 is irradiated with flash light 12 from the light irradiation device 100. Here, when the recording layer of the optical information recording medium 1 is a Ge—Sb—Te-based alloy layer having a thickness of 20 nm and the reflective layer is an Au layer having a thickness of 10 nm, the transmittance of the optical information recording medium 1 is about 50. %, Almost half of the flash light 12 irradiated to the optical information recording medium 1 is transmitted.
[0068]
As shown in FIG. 6B, about half of the flash light 12 that has entered the optical information recording medium 1 passes through the recording multilayer film 16 and further passes through the protective layer 20 to pass through the low light reflecting portion 43 and The high light reflection part 44 is reached. The flash light 12 reaching the high light reflection portion 44 is reflected by the high light reflection portion 44, reenters the optical recording medium 1, and is absorbed by the recording multilayer film 16. On the other hand, most of the flash light 12 that has reached the low light reflecting portion 43 is absorbed or scattered by the low light reflecting portion 43 and hardly enters the optical recording medium 1 again. Therefore, the substantial amount of incident light of the flash light 12 on the initialization region 13b placed on the high light reflecting portion 44, and the vicinity of the outer peripheral end 13a and the vicinity of the inner peripheral end placed on the low light reflecting portion 43. A difference arises in the substantial incident light quantity to the area | region 13c. As a result, in the recording layers in the outer peripheral end vicinity region 13a and the inner peripheral end vicinity region 13c, the temperatures of the outer peripheral end vicinity region 13a and the inner peripheral end vicinity region 13c are set to the initialization region 13b, although heat diffusibility is poor. Most of the temperature is not initialized. In addition, the thermal strain is small and cracks and wrinkles do not occur.
[0069]
Radius of the optical information recording medium 1 when the entire surface of the optical information recording medium 1 is irradiated with the flash light 12 by the optical information recording medium initialization apparatus of the third embodiment shown in FIGS. 6 (a) and 6 (b). The temperature distribution in the direction is shown in FIG. As is clear from FIG. 7, the temperature of the initialization region 13 b placed on the high light reflection portion 44 reaches or exceeds the initialization temperature, but in the vicinity of the outer peripheral end placed on the low light reflection portion 43. It can be seen that the temperatures of the region 13a and the inner peripheral edge vicinity region 13c are low, and in particular, the vicinity of each end is lower than the initialization temperature.
[0070]
The initialization operation of the optical information recording medium 1 in the third embodiment is merely to cause the light irradiation device 100 to emit the flash light 12 after the optical recording medium 1 is arranged on the support 2B. The optical information recording medium 1 can be initialized efficiently by a simple operation.
[0071]
In the third embodiment, both the high light reflection portion 44 and the low light reflection portion 43 are obtained by surface-treating the surface 23a of the table 23 of the support 2B. However, there is a difference in light reflectance between the two. If it is sufficiently obtained, one of them may be the surface of the table 23, that is, the exposed surface of the material of the table 23 itself.
[0072]
(Fourth embodiment)
A fourth embodiment of the optical information recording medium initialization method and initialization apparatus of the present invention will be described. FIG. 8A is a cross-sectional perspective view showing the configuration of the optical recording medium initialization apparatus of the fourth embodiment, and FIG. 8B is the initialization apparatus shown in FIG. It is an expanded sectional view in the circle specified with the code | symbol V in the initialization state of an optical information recording medium. The same reference numerals as those in the first embodiment shown in FIGS. 1 and 2A indicate the same or corresponding parts.
[0073]
As shown in FIG. 8A, the support 2C has, on the upper surface of the table 24, a ring-shaped protrusion 61a and a columnar protrusion 61b on the central axis of the ring-shaped protrusion 61a. The optical information recording medium 1 is supported by the protrusions 61a and 61b. The ring-shaped protrusion 61 a corresponds to the initialization area 13 b of the optical information recording medium 1. Further, the outer recess 62a of the ring-shaped protrusion 61a corresponds to the outer peripheral end vicinity region 13a of the optical information recording medium 1. Further, a ring-shaped recess 62b between the ring-shaped protrusion 61a and the columnar protrusion 61b corresponds to the inner peripheral end vicinity region 13c of the optical information recording medium 1. Note that the surface of the ring-shaped protrusion 61a is preferably made to have a high light reflectance by mirror treatment or the like, similarly to the surface of the high light reflecting portion 44 in the case of the third embodiment. Further, it is desirable that the inner surfaces of the recesses 62a and 62b have a low light reflectivity by sandblasting or the like, similarly to the surface of the low light reflection portion 43 in the third embodiment.
[0074]
Next, an initialization method for the optical information recording medium of the fourth embodiment will be described. First, as shown in FIG. 8A, the optical information recording medium 1 is placed on the upper surface of the table 24 of the support 2C. At this time, the outer peripheral end vicinity region 13a and the inner peripheral end vicinity region 13c of the optical information recording medium 1 are placed on the recesses 62a and 62b, and the initialization region 13b is placed on the ring-shaped protrusion 61a. Perform positioning. Next, the entire surface of the optical information recording medium 1 is irradiated with flash light 12 from the light irradiation device 100. Here, when the recording layer of the optical information recording medium 1 is a Ge—Sb—Te-based alloy layer having a thickness of 20 nm and the reflective layer is an Au layer having a thickness of 10 nm, the transmittance of the optical information recording medium 1 is about 50. %, Almost half of the flash light 12 irradiated to the optical information recording medium 1 is transmitted.
[0075]
As shown in FIG. 8B, about half of the flash light 12 incident on the optical information recording medium 1 is transmitted through the recording multilayer film 16 and further transmitted through the protective layer 20, and the ring-shaped protrusion 61a. And the recesses 62a and 62b are reached. The flash light 12 that reaches the ring-shaped protrusion 61 a is reflected by the surface thereof, reenters the optical recording medium 1, and is absorbed by the recording multilayer film 16. On the other hand, the flash light 12 that has reached the recesses 62a and 62b directly enters the recesses 62a and 62b, becomes stray light inside the recesses 62a and 62b, and is absorbed or scattered by the inner surfaces of the recesses 62a and 62b. Does not re-enter. Therefore, the substantial incident light amount of the flash light 12 to the initialization region 13b placed on the ring-shaped protrusion 61a, the outer peripheral end vicinity region 13a and the inner peripheral end vicinity region 13c located on the recesses 62a and 62b. There is a difference in the amount of substantial incident light on. As a result, in the outer peripheral end vicinity region 13a and the inner peripheral end vicinity region 13c, although the heat diffusibility is poor, the temperatures of the outer peripheral end vicinity region 13a and the inner peripheral end vicinity region 13c are higher than the temperature of the initialization region 13b. And most of them are not initialized. In addition, the thermal strain is small and cracks and wrinkles do not occur. The temperature distribution in the radial direction of the optical information recording medium 1 when the entire surface of the optical information recording medium 1 is irradiated with the optical information recording medium initialization apparatus of the fourth embodiment is shown in FIG. This is similar to the case of the third embodiment shown.
[0076]
The initialization operation of the optical information recording medium 1 in the fourth embodiment is merely to cause the light irradiation device 100 to emit the flash light 12 after the optical recording medium 1 is arranged on the support 2C. The optical information recording medium 1 can be initialized efficiently by a simple operation.
[0077]
9A, only the ring-shaped protrusion 61a may be formed on the table 24 of the support 2C, and the columnar protrusion 61b on the central axis may be omitted. Alternatively, as shown in FIG. 9B, the center portion of the ring-shaped protrusion 61 a on the table 24 may be a through hole 63.
[0078]
【The invention's effect】
As described above, in the first configuration of the optical information recording medium initialization method and the initialization apparatus according to the present invention, the walls are provided adjacent to the outer peripheral end and the inner peripheral end of the optical information recording medium. In the second configuration, the reflectance of the area facing the initialization area (second area) to be initialized on the surface of the table supporting the optical information recording medium is near the outer peripheral edge. A plurality of regions having different light reflectivities are formed so as to be higher than the reflectivity of the region facing the region (first region) and the region near the inner peripheral edge (third region). Furthermore, in the third configuration, a recess is formed in at least a portion of the surface of the table that supports the optical information recording medium that faces the first region and the third region. Therefore, in the flash light for initializing the optical information recording medium, the amount of light incident on the area near the outer edge and the area near the inner edge of the optical information recording medium is the amount of light incident on the initialization area to be initialized. Therefore, the recording layer in the initialization area can be initialized without initializing most of the recording layer in the area near the outer peripheral edge and the area near the inner peripheral edge. As a result, when the recording layer in the initialization area of the optical information recording medium is initialized, the temperature rise of the recording layer in the area near the outer edge and the area near the inner edge is low, and the recording layer in these areas is cracked. Almost no wrinkles or wrinkles.
[Brief description of the drawings]
FIG. 1 is a cross-sectional perspective view showing the configuration of a first embodiment of an initialization apparatus applied to the implementation of the optical recording medium initialization method of the present invention.
2A is an enlarged cross-sectional view in a circle identified by a symbol X in the initialized state of the optical information recording medium by the initialization apparatus shown in FIG. 1, and FIG. 2B is an outer periphery of the optical information recording medium 1; The figure which shows the positional relationship of the edge vicinity area | region 13a, the inner peripheral edge vicinity area | region 13c, and the initialization area | region 13b.
FIG. 3A is a diagram showing a radial irradiation intensity (incident light quantity) distribution on the surface of the optical information recording medium 1 in the comparative example, and FIG. 3B is a temperature in the radial direction of the optical information recording medium 1 in the comparative example. FIG. 4C shows a distribution, and FIG. 1C shows a radial irradiation intensity distribution on the surface of the optical information recording medium 1 that has been initialized using the optical information recording medium initialization apparatus of the first embodiment shown in FIG. FIG. 4D is a diagram showing a temperature distribution in the radial direction of the optical information recording medium 1 that has been initialized using the optical information recording medium initialization apparatus of the first embodiment shown in FIG.
FIG. 4 is a cross-sectional perspective view showing a configuration of an optical recording medium initialization apparatus according to a second embodiment.
5 is an enlarged cross-sectional view in a circle identified by a symbol Y in the initialization state of the optical information recording medium by the initialization apparatus shown in FIG. 4;
6A is a cross-sectional perspective view showing a configuration of an optical recording medium initialization apparatus according to a third embodiment, and FIG. 6B is an initial diagram of an optical information recording medium by the initialization apparatus shown in FIG. Enlarged sectional view in the circle identified by the symbol Z in the normalized state
FIG. 7 shows optical information recording when the entire surface of the optical information recording medium 1 is irradiated with flash light 12 by the optical information recording medium initialization apparatus of the third embodiment shown in FIGS. 6 (a) and 6 (b). The figure which shows temperature distribution in the radial direction of the medium 1
8A is a cross-sectional perspective view showing a configuration of an optical recording medium initialization apparatus according to a fourth embodiment, and FIG. 8B is an optical information recording medium by the initialization apparatus shown in FIG. 8A. Enlarged sectional view in the circle identified by the symbol V in the initialization state of
FIG. 9A is a cross-sectional perspective view showing another configuration of the optical recording medium initialization apparatus of the fourth embodiment, and FIG. 9B is a further view of the optical recording medium initialization apparatus of the fourth embodiment. Cross-sectional perspective view showing another configuration
FIG. 10 is a cross-sectional perspective view showing the configuration of a conventional optical recording medium initialization apparatus.
[Explanation of symbols]
1: Optical information recording medium
1a: Mating hole
2: Support
2A: Support
2B: Support
2C: Support
3: dent
4: Flash lamp
5: Main capacitor
6: Power supply
7: Changeover switch
8: Trigger switch
9: Trigger coil
10: Trigger capacitor
11: Charging resistance
12: Flash light
13a: Area near the outer peripheral edge
13b: Initialization area
13c: Area near the inner peripheral edge
14: Frame
14a: bottom plate
15: protrusion
16: Recording multilayer film
17: Flash drive circuit
18: Table
19: Substrate
20: Surface protective layer
21: Adjustment mechanism
21a: Male thread
22: Table
23: Table
23a: Top surface of table
30: Screen member
31: protrusion
43: Low light reflecting portion
44: High light reflection portion
61a: protrusion
61b: protrusion
62a: dent
62b: dent
63: Through hole
100: Light irradiation device

Claims (26)

光の照射により光学特性が変化する記録層を備えた光学情報記録媒体を、フラッシュ光の照射により初期化する方法であって、
前記光学情報記録媒体を支持するための支持体に、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の内周部と前記外周部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段として、前記支持体に支持された前記光学情報記録媒体の外周に沿って、前記フラッシュ光の光源側に突出した前記光学情報記録媒体の厚さよりも高い壁を形成し、
前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射し、少なくとも前記第２の領域を初期化する光学情報記録媒体の初期化方法。An optical information recording medium having a recording layer whose optical characteristics change by light irradiation is a method of initializing by flash light irradiation,
The support for supporting the optical information recording medium has at least the amount of flash light incident on the first region in the vicinity of the outer peripheral portion of the optical information recording medium, and the inner peripheral portion of the optical information recording medium and the optical information recording medium. As the incident light amount adjusting means for reducing the amount of incident flash light to the second region intermediate to the outer peripheral portion, the flash is provided along the outer periphery of the optical information recording medium supported by the support. Forming a wall higher than the thickness of the optical information recording medium protruding to the light source side,
A method of initializing an optical information recording medium, comprising: irradiating flash light toward the entire surface of the optical information recording medium in a state where the optical information recording medium is supported by the support, and initializing at least the second area. 光の照射により光学特性が変化する記録層を備えた光学情報記録媒体を、フラッシュ光の照射により初期化する方法であって、
前記光学情報記録媒体を支持するための支持体に、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の内周部と前記外周部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段として、前記支持体の前記光学情報記録媒体が載置される表面に光の反射率が異なる複数の領域を形成し、前記第２の領域に対向する領域の反射率を前記第１の領域に対向する領域の反射率よりも高くして、
前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射し、少なくとも前記第２の領域を初期化する光学情報記録媒体の初期化方法。 An optical information recording medium having a recording layer whose optical characteristics change by light irradiation is a method of initializing by flash light irradiation,
The support for supporting the optical information recording medium has at least the amount of flash light incident on the first region in the vicinity of the outer peripheral portion of the optical information recording medium, and the inner peripheral portion of the optical information recording medium and the optical information recording medium. Reflectance of light on the surface of the support on which the optical information recording medium is placed as a means for adjusting the amount of incident light so as to be smaller than the amount of incident flash light on the second region intermediate to the outer peripheral portion forming a plurality of different regions, a high comb than the reflectance of the area facing the reflectivity of a region facing the second region to the first region,
A method of initializing an optical information recording medium, comprising: irradiating flash light toward the entire surface of the optical information recording medium in a state where the optical information recording medium is supported by the support, and initializing at least the second area . 光の照射により光学特性が変化する記録層を備えた光学情報記録媒体を、フラッシュ光の照射により初期化する方法であって、
前記光学情報記録媒体を支持するための支持体に、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の内周部と前記外周部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段として、前記支持体の前記光学情報記録媒体が載置される表面のうち、少なくとも前記第１の領域に対向する部分に凹みを形成し、
前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射し、少なくとも前記第２の領域を初期化する光学情報記録媒体の初期化方法。 An optical information recording medium having a recording layer whose optical characteristics change by light irradiation is a method of initializing by flash light irradiation,
The support for supporting the optical information recording medium has at least the amount of flash light incident on the first region in the vicinity of the outer peripheral portion of the optical information recording medium, and the inner peripheral portion of the optical information recording medium and the optical information recording medium. At least the surface of the surface on which the optical information recording medium of the support is placed as the incident light amount adjusting means for making the incident light quantity smaller than the incident amount of the flash light to the second region intermediate to the outer peripheral portion. Forming a recess in the portion facing the first region ;
A method of initializing an optical information recording medium, comprising: irradiating flash light toward the entire surface of the optical information recording medium in a state where the optical information recording medium is supported by the support, and initializing at least the second area . 光の照射により光学特性が変化する記録層を備えた光学情報記録媒体を、フラッシュ光の照射により初期化する方法であって、
前記光学情報記録媒体を支持するための支持体に、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域および内周部近傍の第３の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の前記内周部と前記外周部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段として、前記支持体に支持された前記光学情報記録媒体の外周及び内周に沿って、前記フラッシュ光の光源側に突出した前記光学情報記録媒体の厚さよりも高い壁を形成し、
前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射し、少なくとも前記第２の領域を初期化する光学情報記録媒体の初期化方法。 An optical information recording medium having a recording layer whose optical characteristics change by light irradiation is a method of initializing by flash light irradiation,
On the support for supporting the optical information recording medium, the amount of the flash light incident on at least the first region near the outer peripheral portion and the third region near the inner peripheral portion of the optical information recording medium, The optical device supported by the support as an incident light amount adjusting means for making the incident amount of the flash light smaller than the incident amount of the flash light to the second region intermediate between the inner peripheral portion and the outer peripheral portion of the optical information recording medium. A wall higher than the thickness of the optical information recording medium protruding toward the light source side of the flash light is formed along the outer periphery and inner periphery of the information recording medium ,
A method of initializing an optical information recording medium, comprising: irradiating flash light toward the entire surface of the optical information recording medium in a state where the optical information recording medium is supported by the support, and initializing at least the second area . 光の照射により光学特性が変化する記録層を備えた光学情報記録媒体を、フラッシュ光の照射により初期化する方法であって、
前記光学情報記録媒体を支持するための支持体に、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域および内周部近傍の第３の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の前記内周部と前記外周部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段として、前記支持体の前記光学情報記録媒体が載置される表面に光の反射率が異なる複数の領域を形成し、前記第２の領域に対向する領域の反射率を前記第１の領域及び前記第３の領域に対向する領域の反射率よりも高くして、
前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射し、少なくとも前記第２の領域を初期化する光学情報記録媒体の初期化方法。 An optical information recording medium having a recording layer whose optical characteristics change by light irradiation is a method of initializing by flash light irradiation,
On the support for supporting the optical information recording medium, the amount of the flash light incident on at least the first region near the outer peripheral portion and the third region near the inner peripheral portion of the optical information recording medium, The optical information recording medium of the support as an incident light amount adjusting means for making the incident amount of flash light smaller than the incident amount of the flash light to the second region intermediate between the inner peripheral portion and the outer peripheral portion of the optical information recording medium There are formed a plurality of regions different reflectances of light to the surface to be placed, the reflection of the second said reflectance region facing the region of the first region and the region facing the third region high-comb than the rate,
A method of initializing an optical information recording medium, comprising: irradiating flash light toward the entire surface of the optical information recording medium in a state where the optical information recording medium is supported by the support, and initializing at least the second area . 光の照射により光学特性が変化する記録層を備えた光学情報記録媒体を、フラッシュ光の照射により初期化する方法であって、
前記光学情報記録媒体を支持するための支持体に、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域および内周部近傍の第３の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の前記内周部と前記外周部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段として、前記支持体の前記光学情報記録媒体が載置される表面のうち、少なくとも前記第１の領域及び前記第３の領域に対向する部分を凹ませて、
前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射し、少なくとも前記第２の領域を初期化する光学情報記録媒体の初期化方法。 An optical information recording medium having a recording layer whose optical characteristics change by light irradiation is a method of initializing by flash light irradiation,
On the support for supporting the optical information recording medium, the amount of the flash light incident on at least the first region near the outer peripheral portion and the third region near the inner peripheral portion of the optical information recording medium, The optical information recording medium of the support as an incident light amount adjusting means for making the incident amount of flash light smaller than the incident amount of the flash light to the second region intermediate between the inner peripheral portion and the outer peripheral portion of the optical information recording medium Of the surface on which is placed, at least a portion facing the first region and the third region is recessed,
A method of initializing an optical information recording medium, comprising: irradiating flash light toward the entire surface of the optical information recording medium in a state where the optical information recording medium is supported by the support, and initializing at least the second area . 光の照射により光学特性が変化する記録層を備えた光学情報記録媒体の初期化装置であって、
前記光学情報記録媒体を支持するための支持体と、
前記支持体に設けられ、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の中央部と前記端部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段と、
前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射するフラッシュ光源とを具備し、
前記入射光量調節手段は、前記支持体に支持された前記光学情報記録媒体の外周に沿って、前記フラッシュ光の光源側に突出した前記光学情報記録媒体の厚さよりも高い壁であることを特徴とする光学情報記録媒体の初期化装置。 An apparatus for initializing an optical information recording medium having a recording layer whose optical characteristics are changed by light irradiation,
A support for supporting the optical information recording medium;
An amount of the flash light incident on a first region near at least the outer peripheral portion of the optical information recording medium provided on the support is set to a second intermediate value between the central portion and the end portion of the optical information recording medium. An incident light amount adjusting means for reducing the amount of the flash light incident on the area of
A flash light source that irradiates flash light toward the entire surface of the optical information recording medium in a state where the optical information recording medium is supported by the support;
The incident light amount adjusting means is a wall higher than the thickness of the optical information recording medium protruding toward the light source side of the flash light along the outer periphery of the optical information recording medium supported by the support. initializing apparatus of an optical science information recording medium shall be the features. 前記壁の高さを調節する調節手段を有する請求項７記載の光学情報記録媒体の初期化装置。8. The optical information recording medium initialization apparatus according to claim 7, further comprising an adjusting means for adjusting the height of the wall. 前記入射光量調節手段は略円筒状の枠体であり、前記支持体は前記枠体及び前記枠体の中心軸に平行に移動可能なテーブルを含む請求項８記載の光学情報記録媒体の初期化装置。9. The optical information recording medium according to claim 8, wherein the incident light amount adjusting means is a substantially cylindrical frame, and the support includes a table movable in parallel with the frame and a central axis of the frame. Device. 光の照射により光学特性が変化する記録層を備えた光学情報記録媒体の初期化装置であって、
前記光学情報記録媒体を支持するための支持体と、
前記支持体に設けられ、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の中央部と前記端部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段と、
前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射するフラッシュ光源とを具備し、
前記入射光量調節手段は、テーブル状の支持体上に載置された光学情報記録媒体の外周部と嵌合する内周部を有する枠体である光学情報記録媒体の初期化装置。 An apparatus for initializing an optical information recording medium having a recording layer whose optical characteristics are changed by light irradiation,
A support for supporting the optical information recording medium;
An amount of the flash light incident on a first region near at least the outer peripheral portion of the optical information recording medium provided on the support is set to a second intermediate value between the central portion and the end portion of the optical information recording medium. An incident light amount adjusting means for reducing the amount of the flash light incident on the area of
A flash light source that irradiates flash light toward the entire surface of the optical information recording medium in a state where the optical information recording medium is supported by the support;
The incident light amount adjusting means is an optical information recording medium initialization device that is a frame having an inner peripheral portion that fits with an outer peripheral portion of an optical information recording medium placed on a table-like support. 前記壁の高さをｄ、前記支持体のテーブル面から前記光学情報記録媒体中の記録層までの高さをｈ、前記光学情報記録媒体の中心から外周端までの距離をＡ、前記光学情報記録媒体の中心から初期化すべき前記第２の領域の外周端までの距離をａとして、ｄ≧ｈ＋（Ａ−ａ）を満足する請求項７に記載の光学情報記録媒体の初期化装置。The height of the wall is d, the height from the table surface of the support to the recording layer in the optical information recording medium is h, the distance from the center of the optical information recording medium to the outer peripheral edge is A, and the optical information 8. The optical information recording medium initialization apparatus according to claim 7 , wherein d ≧ h + (A−a) is satisfied, where a is a distance from the center of the recording medium to the outer peripheral edge of the second region to be initialized. 光の照射により光学特性が変化する記録層を備えた光学情報記録媒体の初期化装置であって、
前記光学情報記録媒体を支持するための支持体と、
前記支持体に設けられ、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の中央部と前記端部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段と、
前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射するフラッシュ光源とを具備し、
前記入射光量調節手段は、前記支持体の前記光学情報記録媒体が載置される表面に形成された光の反射率が異なる複数の領域を有し、前記第２の領域に対向する領域の反射率が前記第１の領域に対向する領域の反射率よりも高いことにより構成された光学情報記録媒体の初期化装置。 An apparatus for initializing an optical information recording medium having a recording layer whose optical characteristics are changed by light irradiation,
A support for supporting the optical information recording medium;
An amount of the flash light incident on a first region near at least the outer peripheral portion of the optical information recording medium provided on the support is set to a second intermediate value between the central portion and the end portion of the optical information recording medium. An incident light amount adjusting means for reducing the amount of the flash light incident on the area of
A flash light source that irradiates flash light toward the entire surface of the optical information recording medium in a state where the optical information recording medium is supported by the support;
The incident light amount adjusting means includes a plurality of regions having different reflectances of light formed on a surface of the support on which the optical information recording medium is placed, and is a region facing the second region. initializing apparatus than the reflectance of the region the reflectance is opposed to the first region being constituted by a high Ikoto optical science information recording medium. 前記支持体の前記光学情報記録媒体が設置される表面の内、前記第２の領域に対向する領域は鏡面化処理が施され、前記第１の領域に対向する領域は黒色化処理又は粗面化処理が施されている請求項１２記載の光学情報記録媒体の初期化装置。Of the surface of the support on which the optical information recording medium is installed, the region facing the second region is subjected to a mirror surface treatment, and the region facing the first region is blackened or roughened. The optical information recording medium initialization apparatus according to claim 12, wherein the initialization process is performed. 光の照射により光学特性が変化する記録層を備えた光学情報記録媒体の初期化装置であって、
前記光学情報記録媒体を支持するための支持体と、
前記支持体に設けられ、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の中央部と前記端部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段と、
前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射するフラッシュ光源とを具備し、
前記入射光量調節手段は、前記支持体の前記光学情報記録媒体が載置される表面のうち、少なくとも前記第１の領域に対向する部分に形成された凹部である光学情報記録媒体の初期化装置。 An apparatus for initializing an optical information recording medium having a recording layer whose optical characteristics are changed by light irradiation,
A support for supporting the optical information recording medium;
An amount of the flash light incident on a first region near at least the outer peripheral portion of the optical information recording medium provided on the support is set to a second intermediate value between the central portion and the end portion of the optical information recording medium. An incident light amount adjusting means for reducing the amount of the flash light incident on the area of
A flash light source that irradiates flash light toward the entire surface of the optical information recording medium in a state where the optical information recording medium is supported by the support;
The incident light quantity adjusting means, of the surface of the optical information recording medium of the support is placed, of at least the first Ru recess Der formed a portion facing the region optical science information recording medium Initialization device. 前記支持体の前記光学情報記録媒体が設置される表面の内、前記第２の領域に対向する領域は鏡面化処理が施されている請求項１４記載の光学情報記録媒体の初期化装置。The optical information recording medium initialization apparatus according to claim 14 , wherein a region facing the second region in a surface of the support on which the optical information recording medium is installed is subjected to a mirror surface treatment. 前記凹部の内面に黒色化処理又は粗面化処理が施されている請求項１４記載の記録媒体の初期化装置。The recording medium initialization apparatus according to claim 14, wherein the inner surface of the concave portion is subjected to blackening treatment or roughening treatment. 光の照射により光学特性が変化する記録層を備えた光学情報記録媒体の初期化装置であって、
前記光学情報記録媒体を支持するための支持体と、
前記支持体に設けられ、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域および内周部近傍の第３の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の中央部と前記端部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段と、
前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射するフラッシュ光源とを具備し、
前記入射光量調節手段は、前記支持体に支持された前記光学情報記録媒体の外周及び内周に沿って、前記フラッシュ光の光源側に突出した前記光学情報記録媒体の厚さよりも高い壁であることを特徴とする光学情報記録媒体の初期化装置。 An apparatus for initializing an optical information recording medium having a recording layer whose optical characteristics are changed by light irradiation,
A support for supporting the optical information recording medium;
The amount of the flash light incident on at least a first region near the outer periphery of the optical information recording medium and a third region near the inner periphery of the optical information recording medium is set at the center of the optical information recording medium. Incident light amount adjusting means for making the incident amount of the flash light smaller than the incident amount of the flash light to the second region intermediate between the first and second ends,
A flash light source that irradiates flash light toward the entire surface of the optical information recording medium in a state where the optical information recording medium is supported by the support;
The incident light amount adjusting means is a wall higher than the thickness of the optical information recording medium protruding toward the light source side of the flash light along the outer periphery and inner periphery of the optical information recording medium supported by the support. initializing apparatus of an optical science information recording medium you wherein there. 前記壁の高さを調節する調節手段を有する請求項１７記載の光学情報記録媒体の初期化装置。The optical information recording medium initialization apparatus according to claim 17, further comprising an adjusting unit that adjusts the height of the wall. 光の照射により光学特性が変化する記録層を備えた光学情報記録媒体の初期化装置であって、
前記光学情報記録媒体を支持するための支持体と、
前記支持体に設けられ、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域および内周部近傍の第３の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の中央部と前記端部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段と、
前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全 面に向けてフラッシュ光を照射するフラッシュ光源とを具備し、
前記入射光量調節手段は略円筒状の枠体及び前記枠体の中心軸上に設けられた突起であり、前記支持体は前記枠体、前記突起及び前記枠体の中心軸に平行に移動可能なテーブルを含む光学情報記録媒体の初期化装置。 An apparatus for initializing an optical information recording medium having a recording layer whose optical characteristics are changed by light irradiation,
A support for supporting the optical information recording medium;
The amount of the flash light incident on at least a first region near the outer periphery of the optical information recording medium and a third region near the inner periphery of the optical information recording medium is set at the center of the optical information recording medium. Incident light amount adjusting means for making the incident amount of the flash light smaller than the incident amount of the flash light to the second region intermediate between the first and second ends,
The optical information recording medium in a state of being supported by said support, comprising a flash light source for emitting flash light toward the entire surface of the optical information recording medium,
The incident light amount adjusting means is a substantially cylindrical frame and a projection provided on the central axis of the frame, and the support moves parallel to the frame, the projection and the central axis of the frame. a possible table initialization device including optical science information recording medium. 光の照射により光学特性が変化する記録層を備えた光学情報記録媒体の初期化装置であって、
前記光学情報記録媒体を支持するための支持体と、
前記支持体に設けられ、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域および内周部近傍の第３の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の中央部と前記端部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段と、
前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射するフラッシュ光源とを具備し、
前記入射光量調節手段は、テーブル状の支持体上に載置された光学情報記録媒体の外周部と嵌合する内周部を有する枠体、及び前記光学情報記録媒体の内周部と嵌合する外周部を有する突起である光学情報記録媒体の初期化装置。 An apparatus for initializing an optical information recording medium having a recording layer whose optical characteristics are changed by light irradiation,
A support for supporting the optical information recording medium;
The amount of the flash light incident on at least a first region near the outer periphery of the optical information recording medium and a third region near the inner periphery of the optical information recording medium is set at the center of the optical information recording medium. Incident light amount adjusting means for making the incident amount of the flash light smaller than the incident amount of the flash light to the second region intermediate between the first and second ends,
A flash light source that irradiates flash light toward the entire surface of the optical information recording medium in a state where the optical information recording medium is supported by the support;
The incident light amount adjusting means includes a frame having an inner peripheral portion that fits with an outer peripheral portion of an optical information recording medium placed on a table-like support, and an inner peripheral portion of the optical information recording medium. initializing apparatus projections der Ru optical science information recording medium having an outer peripheral portion of focus. 前記壁の高さをｄ、前記支持体のテーブル面から前記光学情報記録媒体中の記録層までの高さをｈ、前記光学情報記録媒体の中心から外周端までの距離をＡ、前記光学情報記録媒体の中心から初期化すべき前記第２の領域の外周端までの距離をａとして、ｄ≧ｈ＋（Ａ−ａ）を満足する請求項１７に記載の光学情報記録媒体の初期化装置。The height of the wall is d, the height from the table surface of the support to the recording layer in the optical information recording medium is h, the distance from the center of the optical information recording medium to the outer peripheral edge is A, and the optical information 18. The optical information recording medium initialization device according to claim 17 , wherein d ≧ h + (A−a) is satisfied, where a is the distance from the center of the recording medium to the outer peripheral edge of the second region to be initialized. 光の照射により光学特性が変化する記録層を備えた光学情報記録媒体の初期化装置であって、
前記光学情報記録媒体を支持するための支持体と、
前記支持体に設けられ、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域および内周部近傍の第３の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の中央部と前記端部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段と、
前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射するフラッシュ光源とを具備し、
前記入射光量調節手段は、前記支持体の前記光学情報記録媒体が載置される表面に形成された光の反射率が異なる複数の領域を有し、前記第２の領域に対向する領域の反射率が前記第１の領域及び第３の領域に対向する領域の反射率よりも高い光学情報記録媒体の初期化装置。 An apparatus for initializing an optical information recording medium having a recording layer whose optical characteristics are changed by light irradiation,
A support for supporting the optical information recording medium;
The amount of the flash light incident on at least a first region near the outer periphery of the optical information recording medium and a third region near the inner periphery of the optical information recording medium is set at the center of the optical information recording medium. Incident light amount adjusting means for making the incident amount of the flash light smaller than the incident amount of the flash light to the second region intermediate between the first and second ends,
A flash light source that irradiates flash light toward the entire surface of the optical information recording medium in a state where the optical information recording medium is supported by the support;
The incident light amount adjusting means includes a plurality of regions having different reflectances of light formed on a surface of the support on which the optical information recording medium is placed, and is a region facing the second region. reflectance initialization device of the first region and the third have higher than the reflectance of the region facing the region optical science information recording medium. 前記支持体の前記光学情報記録媒体が設置される表面の内、前記第２の領域に対向する領域は鏡面化処理が施され、前記第１の領域及び第３の領域に対向する領域は黒色化処理又は粗面化処理が施されている請求項２２記載の光学情報記録媒体の初期化装置。Of the surface of the support on which the optical information recording medium is installed, the region facing the second region is mirror-finished, and the region facing the first region and the third region is black. 23. The optical information recording medium initialization apparatus according to claim 22 , wherein the optical information recording medium has been subjected to surface treatment or surface roughening. 光の照射により光学特性が変化する記録層を備えた光学情報記録媒体の初期化装置であって、
前記光学情報記録媒体を支持するための支持体と、
前記支持体に設けられ、少なくとも前記光学情報記録媒体の外周部近傍の第１の領域および内周部近傍の第３の領域への前記フラッシュ光の入射量を、前記光学情報記録媒体の中央部と前記端部との中間の第２の領域への前記フラッシュ光の入射量よりも少くするための入射光量調節手段と、
前記光学情報記録媒体を前記支持体により支持した状態で、前記光学情報記録媒体の全面に向けてフラッシュ光を照射するフラッシュ光源とを具備し、
前記入射光量調節手段は、前記支持体の前記光学情報記録媒体が載置される表面のうち、少なくとも前記第１の領域及び第３の領域に対向する部分に形成された凹部である光学情報記録媒体の初期化装置。 An apparatus for initializing an optical information recording medium having a recording layer whose optical characteristics are changed by light irradiation,
A support for supporting the optical information recording medium;
The amount of the flash light incident on at least a first region near the outer periphery of the optical information recording medium and a third region near the inner periphery of the optical information recording medium is set at the center of the optical information recording medium. Incident light amount adjusting means for making the incident amount of the flash light smaller than the incident amount of the flash light to the second region intermediate between the first and second ends,
A flash light source that irradiates flash light toward the entire surface of the optical information recording medium in a state where the optical information recording medium is supported by the support;
The incident light quantity adjusting means, of the surface of the optical information recording medium of the support is placed, Ru recess der formed in a portion opposed to at least the first region and the third region light An initialization device for academic information recording media. 前記支持体の前記光学情報記録媒体が設置される表面の内、前記第２の領域に対向する領域は鏡面化処理が施されている請求項２４記載の光学情報記録媒体の初期化装置。25. The optical information recording medium initialization apparatus according to claim 24 , wherein a region facing the second region of a surface of the support on which the optical information recording medium is installed is subjected to a mirror surface treatment. 前記凹部の内面に黒色化処理又は粗面化処理が施されている請求項２４記載の記録媒体の初期化装置。The recording medium initialization apparatus according to claim 24, wherein a blackening process or a roughening process is performed on an inner surface of the recess.
JP02993597A 1996-02-16 1997-02-14 Optical information recording medium initialization method and initialization apparatus Expired - Fee Related JP3630355B2 (en)

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