JPH041414B2 - - Google Patents
Info
- Publication number
- JPH041414B2 JPH041414B2 JP55188746A JP18874680A JPH041414B2 JP H041414 B2 JPH041414 B2 JP H041414B2 JP 55188746 A JP55188746 A JP 55188746A JP 18874680 A JP18874680 A JP 18874680A JP H041414 B2 JPH041414 B2 JP H041414B2
- Authority
- JP
- Japan
- Prior art keywords
- reflective
- recording
- film
- metal material
- track
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000007769 metal material Substances 0.000 claims description 13
- 230000003287 optical effect Effects 0.000 claims description 13
- 230000001681 protective effect Effects 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 4
- 230000000704 physical effect Effects 0.000 claims description 4
- 239000010408 film Substances 0.000 description 50
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000005530 etching Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000001678 irradiating effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000004544 sputter deposition Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/253—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates
- G11B7/2531—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of substrates comprising glass
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
- G11B7/258—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers
- G11B7/2585—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers of reflective layers based on aluminium
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
Description
【発明の詳細な説明】
本発明は光情報記録・再生・消去装置に利用さ
れ、光情報を記録、再生及び消去するための光情
報記録体に関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an optical information recording medium used in an optical information recording/reproducing/erasing device for recording, reproducing, and erasing optical information.
この種の光情報記録体はベースとなる円盤上に
記録膜を薄い膜状に形成し、この記録膜面にレー
ザー等の光を照射し、この照射される光ビームの
条件によつて反射率あるいは吸収率等の異なる領
域を作り出すことによつて記録体への情報の書き
込みを行つている。 This type of optical information recording medium has a thin recording film formed on a disk as a base, and the surface of this recording film is irradiated with light such as a laser, and the reflectance is determined by the conditions of the irradiated light beam. Alternatively, information is written on the recording medium by creating regions with different absorption rates, etc.
一方、書き込まれた情報の読み出しについて
は、記録膜面へ光を照射することによつて光学的
な条件の異なる領域を検出して情報を読み出して
いる。 On the other hand, when reading written information, the information is read by irradiating light onto the surface of the recording film to detect areas with different optical conditions.
上記のような記録体では情報の記録・再生精度
を上げ、また記録面を有効に利用して記録密度を
上げるために数μｍピツチでトラツキング情報が
形成されている。このトラツキング情報に基づい
て記録体への記録が行われ、特に既に情報が書き
込まれた記録体にさらに追加記録を行わせる場
合、すでに記録されているトラツクとこれから書
き込もうとするトラツクとの間隔を正確に一定値
に保持しながら記録しなければならない。 In the above-mentioned recording medium, tracking information is formed at a pitch of several μm in order to improve the accuracy of recording and reproducing information and to increase the recording density by effectively utilizing the recording surface. Recording is performed on the recording medium based on this tracking information, and especially when additional recording is performed on a recording medium on which information has already been written, the interval between the already recorded track and the track about to be written can be accurately determined. must be recorded while maintaining it at a constant value.
ところで、上記のような記録体は装置本体に着
脱自在の関係でセツトされ、記録体の一部の複数
トラツクに渡つて情報が記録された後、この記録
体は一旦光情報記録・再生・消去装置本体から取
り外され、再び装置本体にセツトして追加記録を
行わせたい事態がしばしばある。しかし、記録体
を回転軸にセツトして記録・再生・消去動作を行
わせている一切の駆動機構では、回転軸セツトの
際の偏心量が通常数10μｍ程度あり、トラツクピ
ツチが数μｍに設計されていることを考えれば、
新たに追加記録したトラツクは既に記録がなされ
ているトラツクと交叉することになり、正確な記
録は不可能になり、情報記録体としての機能を果
し得ない。 By the way, the above-mentioned recording medium is set in a removable manner in the main body of the apparatus, and after information is recorded on a plurality of tracks in a part of the recording medium, this recording medium is temporarily subjected to optical information recording, reproduction, and erasing. There are often situations where it is desired to remove the device from the main body of the device and then set it back into the main body of the device to perform additional recording. However, in all drive mechanisms that perform recording, reproducing, and erasing operations by setting a recording medium on a rotating shaft, the eccentricity when setting the rotating shaft is usually on the order of several tens of micrometers, and the track pitch is designed to be several micrometers. Considering that
A newly added track will intersect with a track that has already been recorded, making accurate recording impossible and unable to function as an information recording medium.
本発明は上記従来の記録体のもつ問題点に鑑み
てなされたもので、トラツク位置検出をより確実
にして、記録体への光情報の記録・再生動作の精
度を高めるもので、特に偏心量等の影響を除去
し、トラツク間隔を正確に保ちながら次のトラツ
クに書き込むことができる光情報記録体を提供す
る。 The present invention has been made in view of the above-mentioned problems with conventional recording media, and is intended to more reliably detect track positions and improve the accuracy of recording and reproducing optical information on the recording media. To provide an optical information recording medium which can write on the next track while accurately maintaining the track interval by eliminating the influence of the above.
そのために本発明は、ベース円盤上に金属材料
からなる反射膜を所定のピツチで環状に設けて溝
状のトラツクを形成し、照射される光ビームの強
度によつて物理的性質が変化する材料からなる反
射性記録膜により前記金属材料からなる反射膜上
及び前記金属材料からなる反射膜間の溝状のトラ
ツク部分を均一な膜厚で覆い、前記反射性記録膜
上に平坦な表面を得るための透明な保護部材を設
け、前記金属材料からなる反射膜上の前記反射性
記録膜を情報記録部としたことを特徴とするもの
であり、この構成により記録・再生にあたつてト
ラツクへの光ビームの追従に関するサーボ信号
は、上記金属材料からなる反射膜の存否に起因す
る反射性記録膜の表面にできた凹凸に基づく回折
による反射光の光強度分布の変化により取得す
る。この取得された信号によつて、光情報記録体
への入射光の方向を偏向器でトラツクで追従させ
ながら記録・再生を行わせることで正確なトラツ
キングを行うことができる。さらに、反射性記録
膜の記録トラツク部分の背後には金属材料からな
る反射膜が存在するので、再生信号品質を向上で
きる。 To this end, the present invention provides a reflective film made of a metal material on a base disc in a ring shape at a predetermined pitch to form a groove-like track, and a material whose physical properties change depending on the intensity of the irradiated light beam. Covering the groove-like track portions on the reflective film made of the metallic material and between the reflective films made of the metallic material with a reflective recording film made of the above-mentioned metal material with a uniform film thickness to obtain a flat surface on the reflective recording film. The apparatus is characterized in that a transparent protective member is provided for the information recording part, and the reflective recording film on the reflective film made of the metal material serves as an information recording part. A servo signal related to tracking of the light beam is obtained by a change in the light intensity distribution of the reflected light due to diffraction based on the unevenness formed on the surface of the reflective recording film due to the presence or absence of the reflective film made of the metal material. Using this acquired signal, accurate tracking can be performed by performing recording and reproducing while tracking the direction of light incident on the optical information recording medium using a deflector. Furthermore, since a reflective film made of a metal material is present behind the recording track portion of the reflective recording film, the quality of reproduced signals can be improved.
次に図を用いて本発明を詳細に説明する。 Next, the present invention will be explained in detail using the figures.
図において１は樹脂フイルム、ガラス板等から
なるベース円盤で、該ベース円盤１の表面には数
μｍのピツチで反射膜２1，２2，…が同心円状に
形成されている。該反射膜２1，２2，…はAl、
Cr等の金属膜で設けられ、従来公知の蒸着、ス
パツタ等の薄膜形成技術及びエツチング技術等に
よつて製作され、トラツキング情報となる。さら
に、円盤１上には、同心円状に形成された反射膜
２1，２2，…上をはじめ反射膜間の溝部分上に
も、均一な膜厚の反射性記録膜３が作成されてい
る。該反射性記録膜３は照射された光ビームの強
度によつて光反射率あるいは吸収率等の物理的性
質が変化する材料が選ばれ、照射される光ビーム
の波長λに対して所望の反射条件が得られるよう
に材料の屈折率及び膜厚等が調整されて被着され
ている。反射性記録膜３が形成された円盤上には
薄い透明な第１の保護膜４を介して、上記反射性
記録膜３を保護しかつ平坦な表面を得るために同
様に透明の第２の保護膜５が形成されて記録体表
面が保護されている。 In the figure, reference numeral 1 denotes a base disk made of a resin film, a glass plate, etc., and reflective films 2 1 , 2 2 , . . . are formed concentrically on the surface of the base disk 1 at a pitch of several μm. The reflective films 2 1 , 2 2 , ... are made of Al,
It is provided with a metal film such as Cr, and is manufactured by conventionally known thin film forming techniques such as vapor deposition and sputtering, and etching techniques, and serves as tracking information. Further, on the disc 1, a reflective recording film 3 with a uniform thickness is formed on the concentrically formed reflective films 2 1 , 2 2 , . . . and also on the grooves between the reflective films. There is. The reflective recording film 3 is made of a material whose physical properties such as light reflectance or absorption rate change depending on the intensity of the irradiated light beam, and has a desired reflection rate for the wavelength λ of the irradiated light beam. The refractive index, film thickness, etc. of the material are adjusted and deposited so that the conditions are obtained. A thin transparent first protective film 4 is placed over the disc on which the reflective recording film 3 is formed, and a second transparent film is placed on the disc to protect the reflective recording film 3 and to obtain a flat surface. A protective film 5 is formed to protect the surface of the recording medium.
上記構造の記録体において、照射された光ビー
ムは、透明な第１及び第２保護膜４，５を透過し
反射性記録膜３に達する。反射性記録膜３に達し
た光の一部は該反射性記録膜３をも通過し、その
通過した光が反射膜２1，２2，…により反射され
る。ここで、反射性記録膜３の表面は反射膜２1，
２2，…の存在によつてその境界面が凹凸を形成
する。その境界面の光学的条件によつて異なる反
射光量が得られ、これがトラツクの位置検出に用
いられる。 In the recording medium having the above structure, the irradiated light beam passes through the transparent first and second protective films 4 and 5 and reaches the reflective recording film 3. A part of the light that has reached the reflective recording film 3 also passes through the reflective recording film 3, and the transmitted light is reflected by the reflective films 2 1 , 2 2 , . . . . Here, the surface of the reflective recording film 3 is a reflective film 2 1 ,
Due to the presence of 2 2 ,..., the boundary surface forms irregularities. Different amounts of reflected light are obtained depending on the optical conditions of the boundary surface, and this is used to detect the position of the track.
まず、光情報の書き込み及び書き込まれた情報
の読み出し動作は、反射膜２1，２2，…上を被つ
て設けられた反射性記録膜３に、照射光に対して
反射率あるいは吸収係数の異なる領域を作り出し
て情報を書き込み、また、書き込まれた反射性記
録膜３からの反射光の光量変化で情報が検出され
る。 First, the writing of optical information and the reading of the written information are carried out on the reflective recording film 3 provided over the reflective films 2 1 , 2 2 , . Different areas are created to write information, and the information is detected by changes in the amount of reflected light from the written reflective recording film 3.
一方、トラツキング情報の検出は、光スポツト
が反射膜２1，２2，…の存在を検出することによ
つて行われる。すなわち、その境界面に凹凸のあ
る反射性記録膜３に照射される光スポツトはその
照射位置により回折による光強度分布があるた
め、その状態を検出することで光スポツトの位置
を修正できる。 On the other hand, tracking information is detected by the light spot detecting the presence of the reflective films 2 1 , 2 2 , . . . . That is, since the light spot irradiated onto the reflective recording film 3 whose boundary surface is uneven has a light intensity distribution due to diffraction depending on the irradiation position, the position of the light spot can be corrected by detecting this state.
この光強度分布変化はデイテクターによつて検
出され、トラツクサーボ信号として偏向器に導入
され、トラツクに光スポツト追従させて記録・再
生の位置調整が行われる。 This change in light intensity distribution is detected by a detector and introduced into a deflector as a track servo signal, and the track is made to follow the light spot to adjust the recording/reproducing position.
本発明の反射性記録膜は要は光に対して物理的
性質の異なる状態を作り出すことができるもので
あれば利用することができ、結晶性、非結晶質の
膜を利用することができる。 The reflective recording film of the present invention can be used as long as it can create states with different physical properties with respect to light, and can be a crystalline or amorphous film.
以上の本発明によれば、金属材料からなる反射
膜の存否に起因する反射性記録膜の表面にできた
凹凸に基づく回折による反射光の光強度分布の変
化により、記録・再生にあたつてトラツクへの光
ビームの追従に関するサーボ信号を得ることがで
きる。更に反射性記録膜の情報記録部の背後には
金属材料からなる反射膜が存在するので、再生信
号品質を向上できるものである。 According to the present invention, the light intensity distribution of the reflected light changes due to diffraction due to the unevenness formed on the surface of the reflective recording film due to the presence or absence of the reflective film made of a metal material, thereby changing the light intensity distribution during recording and reproduction. A servo signal relating to the following of the light beam to the track can be obtained. Furthermore, since a reflective film made of a metal material is present behind the information recording portion of the reflective recording film, the quality of reproduced signals can be improved.
図は本発明による光情報記録体の断面図であ
る。
１：ベース円盤、２1，２2，…：反射膜、３：
反射性記録膜、４，５：保護膜。
The figure is a sectional view of an optical information recording medium according to the present invention. 1: Base disk, 2 1 , 2 2 ,...: Reflective film, 3:
Reflective recording film, 4, 5: protective film.
Claims (1)
定のピツチで環状に設けて溝状のトラツクを形成
し、 照射される光ビームの強度によつて物理的性質
が変化する材料からなる反射性記録膜により前記
金属材料からなる反射膜上及び前記金属材料から
なる反射膜間の溝状のトラツク部分を均一な膜厚
で覆い、 前記反射性記録膜上に平坦な表面を得るための
透明な保護部材を設け、 前記金属材料からなる反射膜上の前記反射性記
録膜を情報記録部としたことを特徴とする光情報
記録体。[Claims] 1. A reflective film made of a metal material is provided in a ring shape on a base disk at a predetermined pitch to form a groove-like track, and the physical properties change depending on the intensity of the irradiated light beam. Covering the groove-like track portions on the reflective film made of the metal material and between the reflective films made of the metal material with a uniform film thickness with a reflective recording film made of the material, and forming a flat surface on the reflective recording film. 1. An optical information recording body, characterized in that a transparent protective member is provided for obtaining the information, and the reflective recording film on the reflective film made of the metal material serves as an information recording portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55188746A JPS57109138A (en) | 1980-12-25 | 1980-12-25 | Optical information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP55188746A JPS57109138A (en) | 1980-12-25 | 1980-12-25 | Optical information recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57109138A JPS57109138A (en) | 1982-07-07 |
| JPH041414B2 true JPH041414B2 (en) | 1992-01-13 |
Family
ID=16229041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP55188746A Granted JPS57109138A (en) | 1980-12-25 | 1980-12-25 | Optical information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57109138A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL8300960A (en) * | 1983-03-17 | 1984-10-16 | Philips Nv | OPTICAL REGISTRATION DISC. |
| JP2002251786A (en) * | 2001-02-22 | 2002-09-06 | Sony Corp | Optical recording medium and its manufacture |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5114263A (en) * | 1974-07-26 | 1976-02-04 | Hitachi Ltd | Setsugono roeiboshiho |
| JPS5231703A (en) * | 1975-09-05 | 1977-03-10 | Kokusai Denshin Denwa Co Ltd <Kdd> | Magnetic thin film recording medium |
| JPS5348528A (en) * | 1976-09-24 | 1978-05-02 | Thomson Brandt | Information carrier for effecting optical recording and reading and method of manufacturing the same |
| JPS56105344A (en) * | 1980-01-25 | 1981-08-21 | Fuji Photo Film Co Ltd | Photomagnetic recording medium |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56156144U (en) * | 1980-04-21 | 1981-11-21 |
-
1980
- 1980-12-25 JP JP55188746A patent/JPS57109138A/en active Granted
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5114263A (en) * | 1974-07-26 | 1976-02-04 | Hitachi Ltd | Setsugono roeiboshiho |
| JPS5231703A (en) * | 1975-09-05 | 1977-03-10 | Kokusai Denshin Denwa Co Ltd <Kdd> | Magnetic thin film recording medium |
| JPS5348528A (en) * | 1976-09-24 | 1978-05-02 | Thomson Brandt | Information carrier for effecting optical recording and reading and method of manufacturing the same |
| JPS56105344A (en) * | 1980-01-25 | 1981-08-21 | Fuji Photo Film Co Ltd | Photomagnetic recording medium |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57109138A (en) | 1982-07-07 |
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