JP3466967B2 - Data recording medium and servo method therefor - Google Patents
Data recording medium and servo method thereforInfo
- Publication number
- JP3466967B2 JP3466967B2 JP23158999A JP23158999A JP3466967B2 JP 3466967 B2 JP3466967 B2 JP 3466967B2 JP 23158999 A JP23158999 A JP 23158999A JP 23158999 A JP23158999 A JP 23158999A JP 3466967 B2 JP3466967 B2 JP 3466967B2
- Authority
- JP
- Japan
- Prior art keywords
- optical waveguide
- light
- layer
- waveguide layer
- servo
- 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 - Fee Related
Links
Landscapes
- Optical Recording Or Reproduction (AREA)
- Holo Graphy (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、周期的光散乱要因
によって散乱された光が生成する再生像によって記録情
報を再生するデータ記録媒体、特に位置を高精度に検出
し得るデータ記録媒体及びそのサーボ方法に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording medium for reproducing recorded information by a reproduced image generated by light scattered by a periodic light scattering factor, and more particularly to a data recording medium capable of detecting a position with high accuracy. It relates to the servo method.
【０００２】[0002]
【従来の技術】従来より、周期的光散乱要因を利用して
情報を記録した媒体、例えばホログラムを形成したカー
ドでは、偽造防止のために個々のカードの管理が重要に
なっていた。そして、特開平７−３０６６３０号等に示
される通り、カード基板上に、機械読み取り可能な情報
が記録されたホログラムと、前記ホログラムの他に装飾
用のホログラムとを設けた構成とし、これによって、記
録された情報が簡易な光源では容易に読み取ることがで
きず、かつ書き替えも不可能となして、偽造防止性を実
現していた。2. Description of the Related Art Conventionally, in a medium in which information is recorded by utilizing a periodic light scattering factor, for example, a card on which a hologram is formed, management of individual cards has been important for preventing forgery. Then, as disclosed in Japanese Patent Application Laid-Open No. 7-306630 and the like, a hologram in which machine-readable information is recorded, and a hologram for decoration in addition to the hologram are provided on a card substrate. The recorded information could not be easily read by a simple light source and could not be rewritten, thus realizing anti-counterfeit property.
【０００３】[0003]
【発明が解決しようとする課題】このように、従来は機
械的な方法でカードを保護していたが、ホログラムの位
置は特に指定されていなかった。従って、高密度に記録
しても位置合わせする手段が必要であった。As described above, the card is conventionally protected by the mechanical method, but the position of the hologram is not specified. Therefore, it is necessary to provide a means for aligning even when recording at high density.
【０００４】本発明の目的は、位置を高精度に検出し得
るデータ記録媒体及びそのサーボ方法を提供することに
ある。An object of the present invention is to provide a data recording medium capable of detecting a position with high accuracy and a servo method therefor.
【０００５】[0005]
【課題を解決するための手段】前記課題を解決するた
め、本発明では、光導波層及びその上下の保持層からな
る平面型光導波路に周期的光散乱要因を形成し、当該光
導波路に光を伝搬させた際に生じる散乱光が情報を形成
する平面導波路型情報記録層を少なくとも一層備えたデ
ータ記録媒体において、前記周期的光散乱要因は前記光
導波層と前記保持層との界面近傍の前記光導波層あるい
は前記保持層に周期的に形成された、前記光導波層を伝
搬する光の波長程度の繰り返しピッチを有する凹凸形状
であり、前記繰り返しピッチの間隔が互いに異なり前記
光導波層の光の伝搬方向に沿った互いに異なる方向の散
乱光を発生する２つの微小領域を、前記光導波層の光の
伝搬方向と直交する方向に近接させ、かつ、前記光導波
層の光の伝搬方向にずらして設けたサーボ用のデータマ
ークを、前記平面導波路型情報記録層の少なくとも一部
に形成したことを特徴とする。In order to solve the above-mentioned problems, in the present invention, a periodic light scattering factor is formed in a planar optical waveguide consisting of an optical waveguide layer and holding layers above and below the optical waveguide layer, and the In a data recording medium having at least one planar waveguide type information recording layer in which scattered light generated when propagating light propagates information, the periodic light scattering factor is near the interface between the optical waveguide layer and the holding layer. of said optical waveguide layer or the are periodically formed on the retaining layer, an uneven shape having a repetition pitch of about the wavelength of light propagating through the optical waveguide layer, wherein depends interval repetition pitch from each other the
Dispersion in different directions along the light propagation direction of the optical waveguide layer.
The two minute regions that generate turbulent light are connected to the light of the optical waveguide layer.
A servo data mark provided close to a direction orthogonal to the propagation direction and shifted in the light propagation direction of the optical waveguide layer is formed on at least a part of the planar waveguide type information recording layer. Characterize.
【０００６】前記構成によれば、繰り返しピッチの間隔
が互いに異なり前記光導波層の光の伝搬方向に沿った互
いに異なる方向の散乱光を発生する２つの微小領域を、
前記光導波層の光の伝搬方向と直交する方向に近接さ
せ、かつ、光導波層の光の伝搬方向にずらして設けたこ
とにより、光導波層に光を伝搬させた際に媒体と光検出
器との位置関係を反映し得る２つの散乱光を、光の伝搬
方向に沿って発生させることができる。[0006] each other said According to the arrangement, along the direction of light propagation distance from each other different Ri said optical waveguide layer repetition pitch
Two small areas that generate scattered light in different directions ,
Proximity in the direction orthogonal to the light propagation direction of the optical waveguide layer
In addition, the two scattered lights that can reflect the positional relationship between the medium and the photodetector when the light is propagated in the optical waveguide layer by being provided so as to be shifted in the light propagation direction of the optical waveguide layer, It can be generated along the light propagation direction.
【０００７】また、本発明では、光導波層及びその上下
の保持層からなる平面型光導波路に周期的光散乱要因を
形成し、当該光導波路に光を伝搬させた際に生じる散乱
光が情報を形成する平面導波路型情報記録層を少なくと
も一層備えたデータ記録媒体において、前記周期的光散
乱要因は前記光導波層と前記保持層との界面近傍の前記
光導波層あるいは前記保持層に周期的に形成された、前
記凹凸形状を互いに異なる方向に傾け前記光導波層の光
の伝搬方向と直交した互いに異なる方向の散乱光を発生
する２つの微小領域を、前記光導波層の光の伝搬方向に
近接させ、かつ、前記光導波層の光の伝搬方向と直交す
る方向にずらして設けたサーボ用のデータマークを、前
記平面導波路型情報記録層の少なくとも一部に形成した
ことを特徴とする。Further, according to the present invention, a periodic light scattering factor is formed in the planar optical waveguide consisting of the optical waveguide layer and the holding layers above and below the optical waveguide layer, and the scattered light generated when the light is propagated through the optical waveguide is information. In the data recording medium having at least one planar waveguide type information recording layer forming the, the periodic light scattering factor is periodic in the optical waveguide layer or the holding layer near the interface between the optical waveguide layer and the holding layer. Light of the optical waveguide layer, which is formed by tilting the uneven shape in different directions.
Generates scattered light in different directions orthogonal to the propagation direction of
The two small regions in the optical propagation direction of the optical waveguide layer.
A servo data mark provided close to the optical waveguide layer and shifted in a direction orthogonal to the light propagation direction of the optical waveguide layer is formed on at least a part of the planar waveguide type information recording layer. .
【０００８】前記構成によれば、前記凹凸形状を互いに
異なる方向に傾け前記光導波層の光の伝搬方向と直交し
た互いに異なる方向の散乱光を発生する２つの微小領域
を、前記光導波層の光の伝搬方向に近接させ、かつ、前
記光導波層の光の伝搬方向と直交する方向にずらして設
けたことにより、光導波層に光を伝搬させた際に媒体と
光検出器との位置関係を反映し得る２つの散乱光を、光
の伝搬方向と直交する方向に沿って発生させることがで
きる。According to the above structure, the concave and convex shapes are tilted in different directions and are orthogonal to the light propagation direction of the optical waveguide layer.
In addition, the two minute regions that generate scattered light in different directions are arranged close to each other in the light propagation direction of the optical waveguide layer and are shifted in a direction orthogonal to the light propagation direction of the optical waveguide layer. As a result, two scattered lights that can reflect the positional relationship between the medium and the photodetector when light is propagated through the optical waveguide layer are generated along the direction orthogonal to the light propagation direction. You can
【０００９】また、本発明では、光導波層とその上下の
保持層との界面近傍の前記光導波層あるいは前記保持層
に前記光導波層を伝搬する光の波長程度の繰り返しピッ
チを有する凹凸が周期的に形成され、当該光導波路に光
を伝搬させた際に生じる散乱光が情報を形成する平面導
波路型情報記録層を少なくとも一層備えるとともに、前
記繰り返しピッチの間隔が互いに異なり前記光導波層の
光の伝搬方向に沿った互いに異なる方向の散乱光を発生
する２つの微小領域を、前記光導波層の光の伝搬方向と
直交する方向に近接させ、かつ、前記光導波層の光の伝
搬方向にずらして設けたサーボ用のデータマークを、前
記平面導波路型情報記録層の少なくとも一部に形成した
データ記録媒体の光導波路に光を伝搬させた際に前記２
つの微小領域から生じる散乱光を検出して前記データ記
録媒体に対するサーボを行うサーボ方法において、２つ
の微小領域からの散乱光の光強度を４分割光検出器で検
出し、４分割光検出器のうちの隣接しない所定の２つの
検出領域同士の出力の和と、残りの２つの検出領域同士
の出力の和との差を求めて、媒体と光検出器との間の距
離に関するデータを求め、４分割光検出器のうちの隣接
する所定の２つの検出領域同士の出力の和と、残りの２
つの検出領域同士の出力の和との差を求めて、媒体と光
検出器との間の面内位置に関するデータを求めることを
特徴とする。前記構成によれば、４分割光検出器の４つ
の出力から、媒体と光検出器との間の距離及び面内位置
に関するデータを取得でき、これによって、最適な光検
出器の位置を知ることができ、記録情報を正確に再生す
ることができる。 Further, according to the present invention, the optical waveguide layer and the upper and lower portions thereof are provided.
The optical waveguide layer or the holding layer near the interface with the holding layer
The repetition pitch of about the wavelength of the light propagating in the optical waveguide layer.
The unevenness having a pitch is periodically formed, and
The scattered light generated when propagating a plane propagates information and forms a plane guide.
With at least one waveguide type information recording layer,
The spacing of the repeating pitch is different from each other
Generates scattered light in different directions along the light propagation direction
The two minute regions that are formed are defined as the light propagation direction of the optical waveguide layer.
Proximity to each other in the direction orthogonal to each other and transmission of light in the optical waveguide layer
The data mark for the servo that is shifted in the carrying direction
When the light is propagated through the optical waveguide of the data recording medium formed on at least a part of the planar waveguide type information recording layer , the above-mentioned 2
In a servo method for detecting scattered light generated from two minute areas and performing servo with respect to the data recording medium, the light intensity of scattered light from two minute areas is detected by a four-division photodetector. Data regarding the distance between the medium and the photodetector is obtained by obtaining the difference between the sum of the outputs of the two predetermined detection areas that are not adjacent to each other and the sum of the outputs of the remaining two detection areas. The sum of the outputs of two adjacent predetermined detection areas of the four-division photodetector and the remaining two
It is characterized in that the difference between the output of the two detection areas and the sum of the outputs is obtained to obtain the data regarding the in-plane position between the medium and the photodetector. According to the configuration, four of the four-division photodetectors
Distance from the output of the medium to the photodetector and the in-plane position
Data can be obtained, which allows for optimal light detection.
You can know the position of the delivery device and reproduce the recorded information accurately.
You can
【００１０】また、本発明では、光導波層とその上下の
保持層との界面近傍の前記光導波層あるいは前記保持層
に前記光導波層を伝搬する光の波長程度の繰り返しピッ
チを有する凹凸形状が周期的に形成され、当該光導波路
に光を伝搬させた際に生じる散乱光が情報を形成する平
面導波路型情報記録層を少なくとも一層備えるととも
に、前記凹凸形状を互いに異なる方向に傾け前記光導波
層の光の伝搬方向と直交した互いに異なる方向の散乱光
を発生する２つの微小領域を、前記光導波層の光の伝搬
方向に近接させ、かつ、前記光導波層の光の伝搬方向と
直交する方向にずらして設けたサーボ用のデータマーク
を、前記平面導波路型情報記録層の少なくとも一部に形
成したデータ記録媒体の光導波路に光を伝搬させた際に
前記２つの微小領域から生じる散乱光を検出して前記デ
ータ記録媒体に対するサーボを行うサーボ方法におい
て、２つの微小領域からの散乱光の光強度を４分割光検
出器で検出し、４分割光検出器のうちの隣接しない所定
の２つの検出領域同士の出力の和と、残りの２つの検出
領域同士の出力の和との差を求めて、媒体と光検出器と
の間の距離に関するデータを求め、４分割光検出器のう
ちの隣接する所定の２つの検出領域同士の出力の和と、
残りの２つの検出領域同士の出力の和との差を求めて、
媒体と光検出器との間の面内位置に関するデータを求め
ることを特徴とする。前記構成によれば、４分割光検出
器の４つの出力から、媒体と光検出器との間の距離及び
面内位置に関するデータを取得でき、これによって、最
適な光検出器の位置を知ることができ、記録情報を正確
に再生することができる。 Further , according to the present invention, the optical waveguide layer and the upper and lower portions thereof are provided.
The optical waveguide layer or the holding layer near the interface with the holding layer
The repetition pitch of about the wavelength of the light propagating in the optical waveguide layer.
The optical waveguide is formed by periodically forming uneven shapes having
The scattered light generated when light is transmitted to the
Having at least one surface waveguide type information recording layer
In addition, the concave and convex shapes are inclined in different directions, and the optical waveguide is tilted.
Scattered light in different directions orthogonal to the light propagation direction of the layer
The two minute regions that generate
In the same direction, and with the light propagation direction of the optical waveguide layer
Data marks for servos that are provided offset in the orthogonal direction
On at least a part of the planar waveguide type information recording layer.
When the light is propagated through the optical waveguide of the data recording medium
The scattered light generated from the two minute areas is detected to detect the data.
Servo method to perform servo on data recording medium
In this way, the light intensity of the scattered light from the two minute areas is divided into four
Detected by the output device, and not specified among the four-division photodetectors
The sum of the outputs of the two detection areas and the remaining two detection areas
The difference between the output of the areas and the sum of the
Data on the distance between
And the sum of the outputs of two adjacent predetermined detection areas,
Find the difference between the output of the remaining two detection areas and
Obtain data on the in-plane position between the medium and the photodetector
It is characterized by According to the above configuration, four-division light detection
From the four outputs of the detector, the distance between the medium and the photodetector and
You can get data about in-plane position,
Accurately record information by knowing the proper photodetector position
Can be played on.
【００１１】[0011]
【発明の実施の形態】以下、図面を用いて本発明の実施
の形態を説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.
【００１２】図１は本発明の第１の実施の形態を示すも
ので、図中、１１はカード等の基板、１２は光導波層、
１３は保持層、１４は凹凸線（形状）、２１は光学系、
２２は光検出器、２３はサーボ光検出器、２４は制御
部、２５は制御機構である。FIG. 1 shows a first embodiment of the present invention. In the figure, 11 is a substrate such as a card, 12 is an optical waveguide layer,
13 is a holding layer, 14 is an uneven line (shape), 21 is an optical system,
Reference numeral 22 is a photodetector, 23 is a servo photodetector, 24 is a control unit, and 25 is a control mechanism.
【００１３】基板１１上には光導波層１２を保持層１３
で保持した構造が１層以上形成されている。この光導波
層１１の上面あるいは下面にはフーリエ変換光学を用い
て計算された記録情報を表す周期的な凹凸線（周期的光
散乱要因）１４が形成されている。また、左右の側端面
の少なくとも一方は４５度にカットされ、傾斜端面１５
を形成している。この例では、５層の光導波層１２から
構成されているが、さらに多層（例えば５０〜１００
層）とすることにより、さらに大量のデータを蓄積する
ことができる。この凹凸の情報は転写により大量に生産
できる。An optical waveguide layer 12 is provided on a substrate 11 and a holding layer 13 is provided.
The structure held in 1 is formed in one or more layers. On the upper surface or the lower surface of the optical waveguide layer 11, periodic uneven lines (periodic light scattering factor) 14 representing recorded information calculated using Fourier transform optics are formed. Further, at least one of the left and right side end faces is cut at 45 degrees, and the inclined end face 15
Is formed. In this example, the optical waveguide layer 12 is composed of five layers, but a multilayer (for example, 50 to 100) is used.
Layer) makes it possible to store a larger amount of data. The information on the unevenness can be mass-produced by transfer.
【００１４】本記録媒体からの情報の読み出しは、次の
ようにして行われる。例えば、図の導波路から情報を読
み出す場合、レーザ（図示せず）からのレーザ光を光学
系２１等により整形・集光して入射光２６を作成する。
この入射光２６を傾斜端面１５に集光する。なお、図面
の奥行き方向には光が広がっていること、即ち傾斜端面
１５には光が扁平に広がって光導波層１２に入射される
のが好適である。光２６は光導波層１２内を伝搬し、伝
搬する光の一部が表面の凹凸線１４により漏れ出して散
乱光２７となるので、この光をＣＣＤ等のエリアセンサ
からなる光検出器２２で検出することにより、光導波層
１２に記録された情報を読み出すことができる。The reading of information from this recording medium is performed as follows. For example, when reading information from the waveguide shown in the figure, incident light 26 is created by shaping and focusing laser light from a laser (not shown) by the optical system 21 or the like.
This incident light 26 is condensed on the inclined end surface 15. It is preferable that the light spreads in the depth direction of the drawing, that is, the light spreads flat on the inclined end surface 15 and is incident on the optical waveguide layer 12. The light 26 propagates in the optical waveguide layer 12, and a part of the propagating light leaks out by the uneven lines 14 on the surface to become scattered light 27. Therefore, this light is detected by the photodetector 22 including an area sensor such as a CCD. The information recorded in the optical waveguide layer 12 can be read by the detection.
【００１５】光導波層１２と保持層１３とは交互積層、
あるいは光導波層１２を保持層１３で挟んで積層するこ
とが好適である。また、光導波層１２を保持層１３で挟
んだものを、単数あるいは複数を集めてスペーサを介し
て積層することが好適である。The optical waveguide layers 12 and the holding layers 13 are alternately laminated,
Alternatively, it is preferable that the optical waveguide layer 12 is sandwiched between the holding layers 13 and laminated. Further, it is preferable that one or a plurality of the optical waveguide layers 12 sandwiched by the holding layers 13 are collected and laminated via a spacer.
【００１６】ここで、媒体上の一部にサーボ信号（サー
ボ用のデータマーク）を記録しておき、その信号を４分
割光検出器であるサーボ光検出器２３で検出する。ま
た、サーボ光検出器２３の出力を制御部２４に送り、光
検出器２２と光導波層１２との間の距離、面方向の位置
（面内位置）を算出する。Here, a servo signal (servo data mark) is recorded on a part of the medium, and the signal is detected by a servo photodetector 23 which is a four-division photodetector. Further, the output of the servo photodetector 23 is sent to the control unit 24, and the distance between the photodetector 22 and the optical waveguide layer 12 and the position in the plane direction (in-plane position) are calculated.
【００１７】図２は本実施の形態におけるサーボ信号を
表すために、光導波層を上から見たものである。また、
図３は本実施の形態における検出（散乱）光の出方を説
明するものである。FIG. 2 is a top view of the optical waveguide layer in order to represent the servo signal in this embodiment. Also,
FIG. 3 illustrates how the detection (scattered) light is emitted in the present embodiment.
【００１８】サーボ信号は、凹凸線１４の間隔（繰り返
しピッチ）が互いに異なる２つの微小領域３１，３２
を、前記光導波層１２の光の伝搬方向に対して平行に近
接させて設けてなっている。ここで、領域３２は領域３
１より図面に対して右側に配置している。また、各領域
を構成する凹凸線１４を３本としたが、２本以上であれ
ば良い。The servo signal has two minute regions 31, 32 in which the intervals (repetition pitch) of the uneven lines 14 are different from each other.
Are provided close to each other in parallel to the light propagation direction of the optical waveguide layer 12. Here, the area 32 is the area 3
It is arranged on the right side of the drawing from 1. Further, the number of the uneven lines 14 forming each region is three, but it may be two or more.
【００１９】図２の領域３１では、凹凸線１４の間隔を
光導波層１２を伝搬する光の波長より長くしている。従
って、この付近からの散乱光は光の位相が図面に対して
右側ほど遅れており、これらの光を合成すると、図３に
示すように、記録面（光導波層）に対して垂直方向から
右方向（但し、図面に対して）に伝搬する光４１とな
る。In the region 31 of FIG. 2, the interval between the uneven lines 14 is made longer than the wavelength of light propagating through the optical waveguide layer 12. Therefore, the phase of light scattered from this vicinity is delayed toward the right side with respect to the drawing, and when these lights are combined, as shown in FIG. 3, from the direction perpendicular to the recording surface (optical waveguide layer). The light 41 propagates in the right direction (however, with respect to the drawing).
【００２０】同様に、領域３２では、凹凸線１４の間隔
を光導波層１２を伝搬する光の波長より短くしている。
従って、この付近からの散乱光は光の位相が図面に対し
て右側ほど進んでおり、これらの光を合成すると、図３
に示すように、記録面に対して垂直方向から左方向（但
し、図面に対して）に伝搬する光４２となる。Similarly, in the region 32, the interval between the uneven lines 14 is set shorter than the wavelength of light propagating in the optical waveguide layer 12.
Therefore, the scattered light from this area has a light phase that advances toward the right side of the drawing.
As shown in, the light 42 propagates from the direction perpendicular to the recording surface to the left (however, with respect to the drawing).
【００２１】図４は本実施の形態におけるサーボ信号に
よる検出光（光の分布）をサーボ検出器の詳細とともに
示すものである。FIG. 4 shows the detection light (light distribution) by the servo signal in this embodiment together with the details of the servo detector.
【００２２】サーボ光検出器２３は４つの検出領域Ｄ
１，Ｄ２，Ｄ３，Ｄ４から構成される。サーボ光検出器
２３が光導波層１２に近い場合（図３中の（ａ）の位
置）、図４（ａ）に示すように、検出光４３（図３中の
光４１に対応）は領域Ｄ１に強く当たり、領域Ｄ２に検
出光４３の一部が当たっている。また、検出光４４（図
３中の光４２に対応）は領域Ｄ３に強く当たり、領域Ｄ
４に検出光４４の一部が当たっている。The servo photodetector 23 has four detection areas D
1, D2, D3, D4. When the servo photodetector 23 is close to the optical waveguide layer 12 (position (a) in FIG. 3), the detected light 43 (corresponding to the light 41 in FIG. 3) is an area as shown in FIG. It strongly hits D1 and part of the detection light 43 hits the area D2. Further, the detection light 44 (corresponding to the light 42 in FIG. 3) hits the area D3 strongly, and the area D3
A part of the detection light 44 hits 4.
【００２３】また、サーボ光検出器２３が光導波層１２
と最適な距離の場合（図３中の（ｂ）の位置）、図４
（ｂ）に示すように、検出光４３は領域Ｄ１と領域Ｄ２
に均等に当たっている。また、検出光４４は領域Ｄ３と
領域Ｄ４に均等に当たっている。Further, the servo photodetector 23 is used as the optical waveguide layer 12.
4 and the optimum distance (position (b) in FIG. 3).
As shown in (b), the detection light 43 includes the area D1 and the area D2.
Evenly hits. The detection light 44 evenly strikes the areas D3 and D4.
【００２４】さらに、サーボ光検出器２３が光導波層１
２から遠い場合（図３中の（ｃ）の位置）、図４（ｃ）
に示すように、検出光４３は領域Ｄ２に強く当たり、領
域Ｄ１に検出光４３の一部が当たっている。また、検出
光４４は領域Ｄ４に強く当たり、領域Ｄ３に検出光４４
の一部が当たっている。Further, the servo photodetector 23 is used as the optical waveguide layer 1.
When it is far from 2 (position (c) in FIG. 3), FIG. 4 (c)
As shown in, the detection light 43 strongly hits the area D2, and a part of the detection light 43 hits the area D1. Further, the detection light 44 strongly hits the area D4, and the detection light 44 strikes the area D3.
Part of is hit.
【００２５】また、光導波層１２と光検出器２２（サー
ボ光検出器２３を含む。）との面方向の位置がずれた場
合には、そのずれに従って領域Ｄ１〜Ｄ４の各部に対す
る検出光が変化する。例えば、光導波層１２がサーボ光
検出器２３に対して上に移動すれば、領域Ｄ１，Ｄ２に
検出光４４が当たるようになる。In addition, the optical waveguide layer 12 and the photodetector 22 (server
The photo detector 23 is included. ), The detection light for each part of the regions D1 to D4 changes according to the displacement. For example, if the optical waveguide layer 12 moves upward with respect to the servo photodetector 23, the detection light 44 will hit the areas D1 and D2.
【００２６】ここで、最適な位置からの高さ方向のずれ
をｄｈ、面内の位置ずれをｄｘ，ｄｙ、ｘ軸を光の伝搬
方向、ｙ軸を光の伝搬方向と直交する方向とすると、各
ずれ量は
ｄｈ＝（ＶＤ２＋ＶＤ４）−（ＶＤ１＋ＶＤ３）
ｄｘ＝（ＶＤ２＋ＶＤ３）−（ＶＤ１＋ＶＤ４）
ｄｙ＝（ＶＤ１＋ＶＤ２）−（ＶＤ３＋ＶＤ４）
で表せる。ここで、ＶＤ１，ＶＤ２，ＶＤ３，ＶＤ４は
サーボ光検出器２３の各検出領域Ｄ１，Ｄ２，Ｄ３，Ｄ
４からの出力値（電圧）である。Here, it is assumed that the deviation in the height direction from the optimum position is dh, the positional deviation in the plane is dx, dy, the x-axis is the light propagation direction, and the y-axis is the direction orthogonal to the light propagation direction. , Each deviation amount can be represented by dh = (VD2 + VD4)-(VD1 + VD3) dx = (VD2 + VD3)-(VD1 + VD4) dy = (VD1 + VD2)-(VD3 + VD4). Here, VD1, VD2, VD3 and VD4 are detection areas D1, D2, D3 and D of the servo photodetector 23.
4 is the output value (voltage).
【００２７】以上のように、各パラメータは差分で表さ
れ、入射光の光量変化等に対して安定な検出が実現でき
る。検出した信号を基に、光検出器２２の位置補正ある
いは再生信号に対する補正を行うことができる。As described above, each parameter is represented by a difference, and stable detection can be realized against changes in the amount of incident light. Based on the detected signal, the position of the photodetector 22 can be corrected or the reproduction signal can be corrected.
【００２８】図５は本発明のデータ記録媒体の第２の実
施の形態を示すもので、図２と同様、本実施の形態にお
けるサーボ信号を表すために、光導波層を上から見た状
態を示している。FIG. 5 shows a second embodiment of the data recording medium of the present invention. Like FIG. 2, the optical waveguide layer is viewed from above in order to represent the servo signal in this embodiment. Is shown.
【００２９】ここでは、サーボ信号を構成する２つの微
小領域５１，５２を三角形として、光検出器の高さによ
る影響が良く出るようにし、感度を高くしている。ま
た、この形状は台形や半円状でも良い。Here, the two minute regions 51 and 52 forming the servo signal are formed in a triangular shape so that the height of the photodetector has a good influence and the sensitivity is increased. Further, this shape may be trapezoidal or semicircular.
【００３０】なお、第１の実施の形態の場合と同様、領
域５２は領域５１より図面に対して右側に配置し、領域
５１では凹凸線１４の間隔を光導波層１２を伝搬する光
の波長より長く、領域５２では凹凸線１４の間隔を光導
波層１２を伝搬する光の波長より短くしている。また、
各領域を構成する凹凸線１４を３本としたが、２本以上
であれば良い。As in the case of the first embodiment, the region 52 is arranged on the right side of the drawing with respect to the region 51, and in the region 51, the interval between the concave and convex lines 14 is the wavelength of the light propagating through the optical waveguide layer 12. In the region 52, the interval between the uneven lines 14 is made shorter than the wavelength of the light propagating in the optical waveguide layer 12. Also,
Although the number of the concave-convex lines 14 forming each region is three, it is sufficient if the number is two or more.
【００３１】図６は本実施の形態におけるサーボ信号に
よる検出光（光の分布）を説明するものである。FIG. 6 illustrates the detection light (light distribution) by the servo signal in this embodiment.
【００３２】サーボ光検出器２３が光導波層１２に近い
場合、図６（ａ）に示すように、検出光５３は領域Ｄ１
に強く当たり、領域Ｄ２に検出光５３の一部が当たって
いる。また、検出光５４は領域Ｄ３に強く当たり、領域
Ｄ４に検出光５４の一部が当たっている。When the servo photodetector 23 is close to the optical waveguide layer 12, as shown in FIG. 6 (a), the detection light 53 has a region D1.
, And part of the detection light 53 hits the area D2. Further, the detection light 54 strongly hits the area D3, and a part of the detection light 54 hits the area D4.
【００３３】また、サーボ光検出器２３が光導波層１２
と最適な距離の場合、図６（ｂ）に示すように、検出光
５３は領域Ｄ１と領域Ｄ２に均等に当たっている。ま
た、検出光５４は領域Ｄ３と領域Ｄ４に均等に当たって
いる。Further, the servo photodetector 23 is used as the optical waveguide layer 12
6B, the detection light 53 uniformly strikes the area D1 and the area D2. The detection light 54 evenly strikes the areas D3 and D4.
【００３４】さらに、サーボ光検出器２３が光導波層１
２から遠い場合、図６（ｃ）に示すように、検出光５３
は領域Ｄ２に強く当たり、領域Ｄ１に検出光５３の一部
が当たっている。また、検出光５４は領域Ｄ４に強く当
たり、領域Ｄ３に検出光５４の一部が当たっている。Further, the servo photodetector 23 is used as the optical waveguide layer 1.
2 is far from 2, as shown in FIG.
Strongly hits the area D2, and a part of the detection light 53 hits the area D1. The detection light 54 strongly hits the area D4, and part of the detection light 54 hits the area D3.
【００３５】また、光導波層１２と光検出器２２（サー
ボ光検出器２３を含む。）との面方向の位置がずれた場
合には、そのずれに従って領域Ｄ１〜Ｄ４の各部に対す
る検出光が変化する。例えば、光導波層１２がサーボ光
検出器２３に対して上に移動すれば、領域Ｄ１，Ｄ２に
検出光５４が当たるようになる。Further, the optical waveguide layer 12 and the photodetector 22 (server
The photo detector 23 is included. ), The detection light for each part of the regions D1 to D4 changes according to the displacement. For example, if the optical waveguide layer 12 moves upward with respect to the servo photodetector 23, the detection light 54 will hit the regions D1 and D2.
【００３６】このように、微小領域の形状を変えること
によって、サーボ光検出器の各検出領域での光の強度を
強くし（ここでは、各検出領域での光の当たっている長
さが長いことを意味する。）、光の当たる位置が変わる
ことによる変化（最適位置から離れた時の変化）を大き
くすることができる。In this way, the intensity of light in each detection region of the servo photodetector is increased by changing the shape of the minute region (here, the length of light hit by each detection region is long). It is possible to increase the change (change when leaving the optimum position) due to the change of the position where the light is applied.
【００３７】また、領域５１の凹凸線の外側（図面に対
して上方）を光の伝搬方向の下流側に傾け、また、領域
５２の凹凸線の外側（図面に対して下方）を光の伝搬方
向の下流側に傾けると、領域５１からの光が図面に対し
て上方に、また、領域５２からの光が図面に対して下方
に伝搬し、光検出器上でこれらの光の干渉を押さえるこ
とができる。The outside of the uneven line of the area 51 (upper side in the drawing) is inclined to the downstream side in the light propagation direction, and the outside of the uneven line of the area 52 (lower side in the drawing) propagates the light. When tilted to the downstream side of the direction, the light from the region 51 propagates upward with respect to the drawing and the light from the region 52 propagates downward with respect to the drawing, suppressing interference of these lights on the photodetector. be able to.
【００３８】図７は本発明のデータ記録媒体の第３の実
施の形態を示すもので、図２と同様、本実施の形態にお
けるサーボ信号を表すために、光導波層を上から見た状
態を示している。FIG. 7 shows a third embodiment of the data recording medium of the present invention. As with FIG. 2, the optical waveguide layer is viewed from above in order to represent the servo signal in the present embodiment. Is shown.
【００３９】サーボ信号は、凹凸線１４の間隔（繰り返
しピッチ）が互いに等しい２つの微小領域６１，６２
を、光導波層１２の光の伝搬方向と直交する方向に対し
て平行に近接させて設けてなっている。ここで、領域６
２は領域６１より図面に対して上側に配置している。ま
た、各領域を構成する凹凸線１４を３本としたが、２本
以上であれば良い。The servo signal has two minute regions 61 and 62 in which the intervals (repetition pitch) of the uneven lines 14 are equal to each other.
Are provided in parallel and close to the direction orthogonal to the light propagation direction of the optical waveguide layer 12. Where region 6
2 is arranged above the region 61 with respect to the drawing. Further, the number of the uneven lines 14 forming each region is three, but it may be two or more.
【００４０】図７の領域６１では、凹凸線１４の間隔を
光導波層１２を伝搬する光の波長とほぼ等しく、凹凸線
１４の内側（図面に対して上方）を光の伝搬方向の下流
側に傾けている。従って、この付近からの散乱光は光の
位相が図面に対して上側ほど遅れており、これらの光を
合成すると、記録面（光導波層）に対して垂直方向から
上方（但し、図面に対して）に伝搬する光となる。In the region 61 of FIG. 7, the interval between the uneven lines 14 is substantially equal to the wavelength of the light propagating through the optical waveguide layer 12, and the inside of the uneven lines 14 (above the drawing) is the downstream side in the light propagation direction. Is inclined to. Therefore, the phase of the light scattered from this vicinity is delayed toward the upper side of the drawing, and when these lights are combined, the light is scattered upward from the direction perpendicular to the recording surface (optical waveguide layer). It becomes the light that propagates to.
【００４１】同様に、領域６２では、凹凸線１４の間隔
を光導波層１２を伝搬する光の波長とほぼ等しく、凹凸
線１４の内側（図面に対して下方）を光の伝搬方向の下
流側に傾けている。従って、この付近からの散乱光は光
の位相が図面に対して下側ほど遅れており、これらの光
を合成すると、記録面（光導波層）に対して垂直方向か
ら下方（但し、図面に対して）に伝搬する光となる。Similarly, in the region 62, the interval between the uneven lines 14 is substantially equal to the wavelength of light propagating through the optical waveguide layer 12, and the inside of the uneven lines 14 (downward in the drawing) is the downstream side in the light propagation direction. Is inclined to. Therefore, the phase of light scattered from this vicinity is delayed toward the lower side of the drawing, and when these lights are combined, the light is downward from the direction perpendicular to the recording surface (optical waveguide layer). Light) that propagates to.
【００４２】なお、領域の形状は三角形、台形、半円状
でも良い。The shape of the region may be triangular, trapezoidal or semicircular.
【００４３】図８は本実施の形態におけるサーボ信号に
よる検出光（光の分布）を説明するものである。なお、
２つの微小領域の配置が第１、第２の実施の形態とは異
なるため、サーボ光検出器２３の４つの検出領域Ｄ１，
Ｄ２，Ｄ３，Ｄ４の配置も変えている。FIG. 8 illustrates the detection light (light distribution) by the servo signal in this embodiment. In addition,
Since the arrangement of the two minute areas is different from that of the first and second embodiments, the four detection areas D1 of the servo photodetector 23 are
The arrangement of D2, D3 and D4 is also changed.
【００４４】サーボ光検出器２３が光導波層１２に近い
場合、図８（ａ）に示すように、検出光６３は領域Ｄ１
に強く当たり、領域Ｄ２に検出光６３の一部が当たって
いる。また、検出光６４は領域Ｄ３に強く当たり、領域
Ｄ４に検出光６４の一部が当たっている。When the servo photodetector 23 is close to the optical waveguide layer 12, as shown in FIG. 8 (a), the detection light 63 has a region D1.
, And part of the detection light 63 hits the area D2. Further, the detection light 64 strongly hits the area D3, and a part of the detection light 64 hits the area D4.
【００４５】また、サーボ光検出器２３が光導波層１２
と最適な距離の場合、図８（ｂ）に示すように、検出光
６３は領域Ｄ１と領域Ｄ２に均等に当たっている。ま
た、検出光６４は領域Ｄ３と領域Ｄ４に均等に当たって
いる。Further, the servo photodetector 23 is used as the optical waveguide layer 12
8B, the detection light 63 uniformly strikes the areas D1 and D2 as shown in FIG. 8B. The detection light 64 evenly strikes the areas D3 and D4.
【００４６】さらに、サーボ光検出器２３が光導波層１
２から遠い場合、図８（ｃ）に示すように、検出光６３
は領域Ｄ２に強く当たり、領域Ｄ１に検出光６３の一部
が当たっている。また、検出光６４は領域Ｄ４に強く当
たり、領域Ｄ３に検出光６４の一部が当たっている。Further, the servo photodetector 23 is used as the optical waveguide layer 1.
When it is far from 2, as shown in FIG.
Strongly hits the area D2 and part of the detection light 63 hits the area D1. Further, the detection light 64 strongly hits the area D4, and part of the detection light 64 hits the area D3.
【００４７】また、光導波層１２と光検出器２２（サー
ボ光検出器２３を含む。）との面方向の位置がずれた場
合には、そのずれに従って領域Ｄ１〜Ｄ４の各部に対す
る検出光が変化する。例えば、光導波層１２がサーボ光
検出器２３に対して左に移動すれば、領域Ｄ１，Ｄ２に
検出光６４が当たるようになる。In addition, the optical waveguide layer 12 and the photodetector 22 (server
The photo detector 23 is included. ), The detection light for each part of the regions D1 to D4 changes according to the displacement. For example, if the optical waveguide layer 12 moves to the left with respect to the servo photodetector 23, the detection light 64 will hit the areas D1 and D2.
【００４８】図９は媒体上に形成するサーボ信号の配置
の例を示すものである。即ち、同図（ａ）はデータ領域
７１の中心にサーボ信号７２を設けた例、（ｂ）はデー
タ領域７１の対角にある２つの角にサーボ信号７２を設
けた例、（ｃ）はデータ領域７１の３つの角にサーボ信
号７２を設けた例、（ｄ）はデータ領域７１の４つの角
にサーボ信号７２を設けた例、（ｅ）はデータ領域７１
の対角でない２つの角にサーボ信号７２を設けた例、
（ｆ）はデータ領域７１の中心と対角でない２つの角に
サーボ信号７２を設けた例を示す。図示したように、デ
ータ領域７１の中心、角、中心と角の組み合わせで構成
できる。FIG. 9 shows an example of the arrangement of servo signals formed on the medium. That is, FIG. 7A shows an example in which the servo signal 72 is provided at the center of the data area 71, FIG. 8B shows an example in which the servo signal 72 is provided at two diagonal corners of the data area 71, and FIG. An example in which the servo signals 72 are provided at the three corners of the data area 71, (d) is an example in which the servo signals 72 are provided at the four corners of the data area 71, and (e) is the data area 71.
An example in which the servo signals 72 are provided at two corners that are not diagonal,
(F) shows an example in which the servo signals 72 are provided at two corners that are not diagonal to the center of the data area 71. As illustrated, the data area 71 can be configured by the center, the corner, and the combination of the center and the corner.
【００４９】図１０は本発明における演算処理のようす
の一例、ここでは図９の（ｂ）に示した配置のサーボ信
号を処理する例を示す。即ち、２３−１，２３−２はデ
ータ領域の対角にある２つの角に配置された２つのサー
ボ信号に対応したサーボ光検出器である。FIG. 10 shows an example of the arithmetic processing according to the present invention, here, an example of processing the servo signals having the arrangement shown in FIG. 9B. That is, 23-1, 23-2 are servo photodetectors corresponding to two servo signals arranged at two corners on the diagonal of the data area.
【００５０】サーボ光検出器２３−１の出力を制御部２
４で演算した結果（ｄｈ１，ｄｘ１，ｄｙ１）と、サー
ボ光検出器２３−２の出力を制御部２４で演算した結果
（ｄｈ２，ｄｘ２，ｄｙ２）とを基に、高さ方向の傾き
をｄｈθ、ｘ方向の傾きｄｘθ、ｙ方向の傾きｄｙθと
すると、
ｄｈθ＝ｄｈ１−ｄｈ２
ｄｘθ＝ｄｘ１−ｄｘ２
ｄｙθ＝ｄｙ１−ｄｙ２
のように求められる。The controller 2 outputs the output of the servo photodetector 23-1.
4 based on the result (dh1, dx1, dy1) calculated and the result (dh2, dx2, dy2) calculated by the controller 24 of the output of the servo photodetector 23-2, the inclination in the height direction is dhθ. , Dxθ in the x direction and dyθ in the y direction, dhθ = dh1-dh2 dxθ = dx1-dx2 dyθ = dy1-dy2.
【００５１】また、平均的な高さのずれｄｈｍ、面内の
位置ずれをｄｘｍ，ｄｙｍとすると、
ｄｈｍ＝ｄｈ１＋ｄｈ２
ｄｘｍ＝ｄｘ１＋ｄｘ２
ｄｙｍ＝ｄｙ１＋ｄｙ２
のようにずれ量を表せる。If the average height deviation dhm and the in-plane positional deviation are dxm and dym, the deviation amount can be expressed as dhm = dh1 + dh2 dxm = dx1 + dx2 dym = dy1 + dy2.
【００５２】ここで、各量は補正する毎に変わっていく
ので、高さのずれ、面内の位置ずれ、高さ方向の傾き、
ｘ方向の傾き、ｙ方向の傾きを順次変更、繰り返し修正
することで、最適な位置に持っていくことができる。Here, since each amount changes every time it is corrected, the height shift, the in-plane position shift, the inclination in the height direction,
The tilt in the x direction and the tilt in the y direction are sequentially changed and repeatedly corrected to bring them to the optimum position.
【００５３】図１１は本発明における演算処理のようす
の他の例、ここでは図９の（ｃ）に示した配置のサーボ
信号を処理する例を示す。即ち、２３−１，２３−２，
２３−３はデータ領域の３つの角に配置された３つのサ
ーボ信号に対応したサーボ光検出器である。FIG. 11 shows another example of the arithmetic processing according to the present invention, here, an example of processing the servo signals having the arrangement shown in FIG. 9C. That is, 23-1, 23-2
Reference numeral 23-3 is a servo photodetector corresponding to three servo signals arranged at three corners of the data area.
【００５４】サーボ光検出器２３−１の出力を制御部２
４で演算した結果（ｄｈ１，ｄｘ１，ｄｙ１）と、サー
ボ光検出器２３−２の出力を制御部２４で演算した結果
（ｄｈ２，ｄｘ２，ｄｙ２）と、サーボ光検出器２３−
３の出力を制御部２４で演算した結果（ｄｈ３，ｄｘ
３，ｄｙ３）とを基に、高さ方向の傾きをｄｈθ、ｘ方
向の傾きｄｘθ、ｙ方向の傾きｄｙθとすると、
ｄｈθ＝ｄｈ１−ｄｈ３
ｄｘθ＝ｄｘ２−ｄｘ３
ｄｙθ＝ｄｙ１−ｄｙ２
のように求められる。The controller 2 outputs the output of the servo photodetector 23-1.
4 (dh1, dx1, dy1), the output of the servo photodetector 23-2 by the controller 24 (dh2, dx2, dy2), and the servo photodetector 23-
The output of 3 is calculated by the control unit 24 (dh3, dx
3, dy3), and the inclination in the height direction is dhθ, the inclination in the x direction is dxθ, and the inclination in the y direction is dyθ, dhθ = dh1-dh3 dxθ = dx2-dx3 dyθ = dy1-dy2 To be
【００５５】また、平均的な高さのずれｄｈｍ、面内の
位置ずれをｄｘｍ，ｄｙｍとすると、
ｄｈｍ＝ｄｈ１＋ｄｈ２＋ｄｈ３
ｄｘｍ＝ｄｘ１＋ｄｘ２＋ｄｘ３
ｄｙｍ＝ｄｙ１＋ｄｙ２＋ｄｙ３
のようにずれ量を表せる。If the average height shift dhm and the in-plane position shift are dxm and dym, the shift amount can be expressed as dhm = dh1 + dh2 + dh3 dxm = dx1 + dx2 + dx3 dym = dy1 + dy2 + dy3.
【００５６】ここで、各量は補正する毎に変わっていく
ので、高さのずれ、面内の位置ずれ、高さ方向の傾き、
ｘ方向の傾き、ｙ方向の傾きを順次変更、繰り返し修正
することで、最適な位置に持っていくことができる。Here, since each amount changes every time it is corrected, the height shift, the in-plane position shift, the inclination in the height direction,
The tilt in the x direction and the tilt in the y direction are sequentially changed and repeatedly corrected to bring them to the optimum position.
【００５７】なお、各量はサーボ光検出器の配置によっ
て、演算方法を変えても良い。また、ここでは光検出器
の位置を変える例を示したが、上記ずれ量を基に、デー
タの読み取り量を変更しても良い。The calculation method for each amount may be changed depending on the arrangement of the servo photodetectors. Although the example in which the position of the photodetector is changed is shown here, the amount of data read may be changed based on the amount of deviation.
【００５８】[0058]
【発明の効果】以上説明したように、本発明によれば、
媒体と光検出器の位置関係を精密に求めることができ、
それによって、光検出器の位置決めを正確に行うことが
できる。また、位置ずれによる信号を補正して求めるこ
とができ、高精度な再生信号を得ることができる。ま
た、この方法は多層についても適用することができ、積
層することにより、多くの情報を稠密に記録することが
可能となる。As described above, according to the present invention,
The positional relationship between the medium and the photodetector can be accurately determined,
Thereby, the photodetector can be accurately positioned. Further, the signal due to the positional deviation can be corrected and obtained, and a highly accurate reproduced signal can be obtained. This method can also be applied to a multi-layer, and by laminating it, it becomes possible to densely record a lot of information.
【図１】本発明の第１の実施の形態を示す構成図FIG. 1 is a configuration diagram showing a first embodiment of the present invention.
【図２】本発明のデータ記録媒体の第１の実施の形態を
示す説明図FIG. 2 is an explanatory diagram showing a first embodiment of a data recording medium of the present invention.
【図３】第１の実施の形態における検出（散乱）光の出
方の説明図FIG. 3 is an explanatory diagram of how detection (scattered) light is emitted in the first embodiment.
【図４】第１の実施の形態におけるサーボ信号による検
出光を示す説明図FIG. 4 is an explanatory view showing detection light by a servo signal in the first embodiment.
【図５】本発明のデータ記録媒体の第２の実施の形態を
示す説明図FIG. 5 is an explanatory diagram showing a second embodiment of a data recording medium of the present invention.
【図６】第２の実施の形態におけるサーボ信号による検
出光を示す説明図FIG. 6 is an explanatory view showing detection light by a servo signal in the second embodiment.
【図７】本発明のデータ記録媒体の第３の実施の形態を
示す説明図FIG. 7 is an explanatory diagram showing a third embodiment of a data recording medium of the present invention.
【図８】第３の実施の形態におけるサーボ信号による検
出光を示す説明図FIG. 8 is an explanatory view showing detection light by a servo signal in the third embodiment.
【図９】媒体上に形成するサーボ信号の配置の例を示す
説明図FIG. 9 is an explanatory diagram showing an example of arrangement of servo signals formed on a medium.
【図１０】本発明における演算処理のようすの一例を示
す説明図FIG. 10 is an explanatory view showing an example of a calculation process according to the present invention.
【図１１】本発明における演算処理のようすの他の例を
示す説明図FIG. 11 is an explanatory view showing another example of the arithmetic processing according to the present invention.
１１：基板、１２：光導波層、１３：保持層、１４は凹
凸線、２１：光学系、２２：光検出器、２３：サーボ光
検出器、２４：制御部、２５：制御機構、２６：入射
光、２７，４１，４２：散乱光、３１，３２，５１，５
２，６１，６２：微小領域、４３，４４，５３，５４，
６３，６４：検出光。11: substrate, 12: optical waveguide layer, 13: holding layer, 14 concave and convex lines, 21: optical system, 22: photodetector, 23: servo photodetector, 24: controller, 25: control mechanism, 26: Incident light, 27, 41, 42: scattered light, 31, 32, 51, 5
2, 61, 62: micro area, 43, 44, 53, 54,
63, 64: Detection light.
フロントページの続き (72)発明者 八木 生剛 東京都千代田区大手町２丁目３番１号 日本電信電話株式会社内 (56)参考文献 特開 平11−195245（ＪＰ，Ａ) 特開 平９−101735（ＪＰ，Ａ) 特開 平２−210626（ＪＰ，Ａ) 特開 昭57−60365（ＪＰ，Ａ) 特開 昭61−156492（ＪＰ，Ａ) 特開 昭62−192038（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G11B 7/09 - 7/10 G11B 7/00 - 7/013 G03H 1/00 - 5/00 Continuation of the front page (72) Inventor Iku Takeshi Yagi 2-3-1, Otemachi, Chiyoda-ku, Tokyo Inside Nippon Telegraph and Telephone Corporation (56) Reference JP-A-11-195245 (JP, A) JP-A-9 -101735 (JP, A) JP-A-2-210626 (JP, A) JP-A-57-60365 (JP, A) JP-A-61-156492 (JP, A) JP-A-62-192038 (JP, A) ) (58) Fields surveyed (Int.Cl. 7 , DB name) G11B 7 /09-7/10 G11B 7/00-7/013 G03H 1/00-5/00
Claims (4)
平面型光導波路に周期的光散乱要因を形成し、当該光導
波路に光を伝搬させた際に生じる散乱光が情報を形成す
る平面導波路型情報記録層を少なくとも一層備えたデー
タ記録媒体において、 前記周期的光散乱要因は前記光導波層と前記保持層との
界面近傍の前記光導波層あるいは前記保持層に周期的に
形成された、前記光導波層を伝搬する光の波長程度の繰
り返しピッチを有する凹凸形状であり、 前記繰り返しピッチの間隔が互いに異なり前記光導波層
の光の伝搬方向に沿った互いに異なる方向の散乱光を発
生する２つの微小領域を、前記光導波層の光の伝搬方向
と直交する方向に近接させ、かつ、前記光導波層の光の
伝搬方向にずらして設けたサーボ用のデータマークを、
前記平面導波路型情報記録層の少なくとも一部に形成し
たことを特徴とするデータ記録媒体。1. A plane on which a periodic light scattering factor is formed in a planar optical waveguide including an optical waveguide layer and upper and lower holding layers, and scattered light generated when light is propagated through the optical waveguide forms information. In a data recording medium having at least one waveguide type information recording layer, the periodic light scattering factor is periodically formed in the optical waveguide layer or the holding layer near an interface between the optical waveguide layer and the holding layer. and said optical waveguiding layer is uneven shape having a repeating pitch of approximately the wavelength of propagating light, the optical waveguide layer interval of the repetitive pitch varies from each other
Emitted scattered light in different directions along the light propagation direction of
The two minute regions that are generated are defined by the light propagation direction of the optical waveguide layer.
A servo data mark provided close to the optical waveguide layer in the direction orthogonal to the optical waveguide layer and displaced in the light propagation direction of the optical waveguide layer,
A data recording medium formed on at least a part of the planar waveguide type information recording layer.
平面型光導波路に周期的光散乱要因を形成し、当該光導
波路に光を伝搬させた際に生じる散乱光が情報を形成す
る平面導波路型情報記録層を少なくとも一層備えたデー
タ記録媒体において、 前記周期的光散乱要因は前記光導波層と前記保持層との
界面近傍の前記光導波層あるいは前記保持層に周期的に
形成された、前記光導波層を伝搬する光の波長程度の繰
り返しピッチを有する凹凸形状であり、 前記凹凸形状を互いに異なる方向に傾け前記光導波層の
光の伝搬方向と直交した互いに異なる方向の散乱光を発
生する２つの微小領域を、前記光導波層の光の伝搬方向
に近接させ、かつ、前記光導波層の光の伝搬方向と直交
する方向にずらして設けたサーボ用のデータマークを、
前記平面導波路型情報記録層の少なくとも一部に形成し
たことを特徴とするデータ記録媒体。2. A plane in which a periodic light scattering factor is formed in a planar optical waveguide including an optical waveguide layer and upper and lower holding layers, and scattered light generated when light is propagated through the optical waveguide forms information. In a data recording medium having at least one waveguide type information recording layer, the periodic light scattering factor is periodically formed in the optical waveguide layer or the holding layer near an interface between the optical waveguide layer and the holding layer. Further, it is a concavo-convex shape having a repeating pitch of about the wavelength of light propagating through the optical waveguide layer, and the concavo-convex shape is tilted in different directions from each other .
It emits scattered light in different directions orthogonal to the light propagation direction.
The two minute regions that are generated are defined by the light propagation direction of the optical waveguide layer.
A servo data mark provided close to the optical waveguide layer and shifted in a direction orthogonal to the light propagation direction of the optical waveguide layer,
A data recording medium formed on at least a part of the planar waveguide type information recording layer.
傍の前記光導波層あるいは前記保持層に前記光導波層を
伝搬する光の波長程度の繰り返しピッチを有す る凹凸形
状が周期的に形成され、当該光導波路に光を伝搬させた
際に生じる散乱光が情報を形成する平面導波路型情報記
録層を少なくとも一層備えるとともに、前記繰り返しピ
ッチの間隔が互いに異なり前記光導波層の光の伝搬方向
に沿った互いに異なる方向の散乱光を発生する２つの微
小領域を、前記光導波層の光の伝搬方向と直交する方向
に近接させ、かつ、前記光導波層の光の伝搬方向にずら
して設けたサーボ用のデータマークを、前記平面導波路
型情報記録層の少なくとも一部に形成したデータ記録媒
体の光導波路に光を伝搬させた際に前記２つの微小領域
から生じる散乱光を検出して前記データ記録媒体に対す
るサーボを行うサーボ方法において、 ２つの微小領域からの散乱光の光強度を４分割光検出器
で検出し、 ４分割光検出器のうちの隣接しない所定の２つの検出領
域同士の出力の和と、残りの２つの検出領域同士の出力
の和との差を求めて、媒体と光検出器との間の距離に関
するデータを求め、 ４分割光検出器のうちの隣接する所定の２つの検出領域
同士の出力の和と、残りの２つの検出領域同士の出力の
和との差を求めて、媒体と光検出器との間の面内位置に
関するデータを求めることを特徴とするデータ記録媒体
のサーボ方法。3. Near the interface between the optical waveguide layer and the upper and lower holding layers.
The optical waveguide layer is provided on the side of the optical waveguide layer or the holding layer.
Concave and convex shape that having a repetition pitch of the order of the wavelength of the propagating light
Shape was periodically formed, and light was propagated to the optical waveguide.
Planar waveguide type information storage where scattered light generated at the time forms information
At least one recording layer is provided, and the repeating
The distance between the switches is different from each other, and the propagation direction of light in the optical waveguide layer is different.
Of two rays that generate scattered light in different directions along the
The small region is a direction orthogonal to the light propagation direction of the optical waveguide layer.
The optical waveguide layer in the direction of light propagation.
The data mark for servo provided by the
In a servo method for detecting a scattered light generated from the two minute regions when light is propagated to an optical waveguide of a data recording medium formed on at least a part of a type information recording layer and performing a servo with respect to the data recording medium, The light intensity of the scattered light from the two minute areas is detected by the four-division photodetector, and the sum of the outputs of two predetermined non-adjacent detection areas of the four-division photodetector and the remaining two detection areas. Data regarding the distance between the medium and the photodetector is obtained by calculating the difference between the outputs of the two, and the sum of the outputs of two adjacent predetermined detection regions of the four-division photodetector, A servo method for a data recording medium, characterized in that the data regarding the in-plane position between the medium and the photodetector is obtained by obtaining the difference between the outputs of the remaining two detection areas.
傍の前記光導波層あるいは前記保持層に前記光導波層を
伝搬する光の波長程度の繰り返しピッチを有する凹凸形
状が周期的に形成され、当該光導波路に光を伝搬させた
際に生じる散乱光が情報を形成する平面導波路型情報記
録層を少なくとも一層備えるとともに、前記凹凸形状を
互いに異なる方向に傾け前記光導波層の光の伝搬方向と
直交した互いに異なる方向の散乱光を発生する２つの微
小領域を、前記光導波層の光の伝搬方向に近接させ、か
つ、前記光導波層の光の伝搬方向と直交する方向にずら
して設けたサーボ用のデータマークを、前記平面導波路
型情報記録層の少なくとも一部に形成したデータ記録媒
体の光導波路に光を伝搬させた際に前記２つの微小領域
から生じる散乱光を検出して前記データ記録媒体に対す
るサーボを行うサーボ方法において、 ２つの微小領域からの散乱光の光強度を４分割光検出器
で検出し、 ４分割光検出器のうちの隣接しない所定の２つの検出領
域同士の出力の和と、残りの２つの検出領域同士の出力
の和との差を求めて、媒体と光検出器との間の距離に関
するデータを求め、 ４分割光検出器のうちの隣接する所定の２つの検出領域
同士の出力の和と、残りの２つの検出領域同士の出力の
和との差を求めて、媒体と光検出器との間の面内位置に
関するデータを求めることを特徴とするデータ記録媒体
のサーボ方法。 4. Near the interface between the optical waveguide layer and the upper and lower holding layers.
The optical waveguide layer is provided on the side of the optical waveguide layer or the holding layer.
Concavo-convex shape with a repeating pitch of about the wavelength of the propagating light
Shape was periodically formed, and light was propagated to the optical waveguide.
Planar waveguide type information storage where scattered light generated at the time forms information
With at least one recording layer,
Inclining in different directions and the light propagation direction of the optical waveguide layer
Two fine particles that generate scattered light in different directions that are orthogonal to each other
The small region is brought close to the light propagation direction of the optical waveguide layer,
Shift in a direction orthogonal to the light propagation direction of the optical waveguide layer.
The data mark for servo provided by the
Data recording medium formed on at least a part of the type information recording layer
When the light is propagated through the optical waveguide of the body, the two minute regions
To the data recording medium by detecting scattered light generated from
In a servo method for performing a servo, a light intensity of scattered light from two small areas is divided into four photodetectors.
In detecting, two predetermined detection territory nonadjacent of the four-division photodetector
The sum of the outputs of the two detection areas and the output of the remaining two detection areas
The difference between the medium and the photodetector
Data to be obtained, and two adjacent predetermined detection areas of the four-division photodetector
The sum of the outputs of the two detection areas and the output of the remaining two detection areas
Calculate the difference from the sum and find the in-plane position between the medium and the photodetector.
Data recording medium characterized by obtaining related data
Servo method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23158999A JP3466967B2 (en) | 1999-08-18 | 1999-08-18 | Data recording medium and servo method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23158999A JP3466967B2 (en) | 1999-08-18 | 1999-08-18 | Data recording medium and servo method therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001056942A JP2001056942A (en) | 2001-02-27 |
| JP3466967B2 true JP3466967B2 (en) | 2003-11-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23158999A Expired - Fee Related JP3466967B2 (en) | 1999-08-18 | 1999-08-18 | Data recording medium and servo method therefor |
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| Country | Link |
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| JP (1) | JP3466967B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7046892B2 (en) * | 2001-06-22 | 2006-05-16 | Nippon Telegraph And Telephone Corporation | Optical waveguide, holographic medium, holographic storage and retrieval method and system |
| KR100557133B1 (en) | 2004-06-30 | 2006-03-03 | 엘지전자 주식회사 | Holographic data storage system |
-
1999
- 1999-08-18 JP JP23158999A patent/JP3466967B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP2001056942A (en) | 2001-02-27 |
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