JP3530082B2 - Data recording medium - Google Patents
Data recording mediumInfo
- Publication number
- JP3530082B2 JP3530082B2 JP23159199A JP23159199A JP3530082B2 JP 3530082 B2 JP3530082 B2 JP 3530082B2 JP 23159199 A JP23159199 A JP 23159199A JP 23159199 A JP23159199 A JP 23159199A JP 3530082 B2 JP3530082 B2 JP 3530082B2
- Authority
- JP
- Japan
- Prior art keywords
- light
- optical waveguide
- predetermined position
- propagation direction
- waveguide layer
- 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、特に再生像の大きさを記
録像より大きくなし得るデータ記録媒体に関するもので
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 in particular, data capable of making the reproduced image larger than the recorded image. The present invention relates to a recording medium.
【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、ホログラムは１
層のみに記録されており、記録像のサイズと再生像のサ
イズが同一であった。従って、高密度に記録しても、読
み出すために拡大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 hologram is
Only the layer was recorded, and the size of the recorded image and the size of the reproduced image were the same. Therefore, even if the data is recorded at a high density, a means for enlarging the data for reading is needed.
【０００４】本発明の目的は、再生像の大きさを記録像
より大きくなし得るデータ記録媒体を提供することにあ
る。An object of the present invention is to provide a data recording medium which can make a reproduced image larger than a recorded image.
【０００５】[0005]
【０００６】[0006]
【０００７】[0007]
【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凹凸形状であり、前
記凹凸形状の繰り返しピッチは前記光導波層を伝搬する
光の波長程度であり、かつ前記光導波層の所定の位置を
中心として、当該所定の位置から光の伝搬方向の下流に
向かって右側では、凹凸形状の右側を光の伝搬方向の下
流側に傾けて凹凸線の左側に比べて右側の散乱光の位相
が遅れるようにし、当該所定の位置から光の伝搬方向の
下流に向かって左側では、凹凸形状の左側を光の伝搬方
向の下流側に傾けて凹凸線の右側に比べて左側の散乱光
の位相が遅れるようにすることで、上方に形成する像を
光の伝搬方向と直交する方向に拡大することを特徴とす
る。 [Means for Solving the Problems]
Therefore , in the present invention, a periodic light scattering factor is formed in the planar optical waveguide composed of the optical waveguide layer and the upper and lower holding layers, and the scattered light generated when the light is propagated in the optical waveguide forms information. In a data recording medium having at least one planar waveguide type information recording layer, the periodic light scattering factor is periodically formed in the optical waveguide layer near the interface between the optical waveguide layer and the holding layer or in the holding layer. And the repeating pitch of the uneven shape is about the wavelength of the light propagating in the optical waveguide layer, and the propagation direction of the light from the predetermined position around the predetermined position of the optical waveguide layer. On the right side toward the downstream of, the right side of the uneven shape is inclined to the downstream side in the light propagation direction and the phase of the scattered light on the right side is compared to the left side of the uneven line.
The left side of the uneven shape is inclined to the downstream side in the light propagation direction from the predetermined position toward the downstream side in the light propagation direction, and the scattered light on the left side is inclined as compared to the right side of the uneven line.
By delaying the phase of, the image formed above
It is characterized by expanding in a direction orthogonal to the light propagation direction .
【０００８】前記構成によれば、光導波層の所定の位置
を中心として、光の伝搬方向の下流に向かって右側では
凹凸形状の右側を下流側に傾け、下流に向かって左側で
は凹凸形状の左側を下流側に傾けることにより、凹凸形
状によって形成される再生像を光の伝搬方向と直交する
方向に拡大して形成できる。According to the above structure, the right side of the uneven shape is inclined to the downstream side on the right side toward the downstream in the light propagation direction, and the uneven shape is formed on the left side toward the downstream side with the predetermined position of the optical waveguide layer as the center. By tilting the left side to the downstream side, the reproduced image formed by the uneven shape can be enlarged and formed in the direction orthogonal to the light propagation direction.
【０００９】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凹凸
形状であり、前記凹凸形状の繰り返しピッチは前記光導
波層を伝搬する光の波長程度であり、かつ前記光導波層
の所定の位置を中心として、当該所定の位置から光の伝
搬方向の上流に向かっては、当該所定の位置の繰り返し
ピッチより小さいピッチ間隔で前記凹凸形状を形成し、
当該所定の位置から光の伝搬方向の下流に向かっては、
当該所定の位置の繰り返しピッチより大きいピッチ間隔
で前記凹凸形状を形成し、さらに前記光導波層の所定の
位置を中心として、当該所定の位置から光の伝搬方向の
下流に向かって右側では、凹凸形状の右側を光の伝搬方
向の下流側に傾けて凹凸線の左側に比べて右側の散乱光
の位相が遅れるようにし、当該所定の位置から光の伝搬
方向の下流に向かって左側では、凹凸形状の左側を光の
伝搬方向の下流側に傾けて凹凸線の右側に比べて左側の
散乱光の位相が遅れるようにすることで、上方に形成す
る像を光の伝搬方向及びこれと直交する方向の双方に拡
大することを特徴とする。Further, in the present invention, a periodic light scattering factor is formed in the planar optical waveguide composed 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. Is formed in a concave and convex shape, the repeating pitch of the concave and convex shape is about the wavelength of light propagating in the optical waveguide layer, and the light is emitted from the predetermined position with the predetermined position of the optical waveguide layer as the center. Toward the upstream in the propagation direction of, the uneven shape is formed at a pitch interval smaller than the repeating pitch of the predetermined position,
From the predetermined position toward the downstream in the light propagation direction,
The uneven shape is formed at a pitch interval larger than the repeating pitch of the predetermined position, and further, on the right side from the predetermined position toward the downstream in the light propagation direction, with the predetermined position of the optical waveguide layer as the center, the unevenness is formed. Incline the right side of the shape to the downstream side of the light propagation direction and scatter light on the right side compared to the left side of the uneven line
The phase is delayed, and the left side of the uneven shape is inclined to the downstream side in the light propagation direction from the predetermined position toward the downstream side in the light propagation direction, and the left side of the uneven line is compared to the right side of the uneven line.
By forming the phase of the scattered light behind,
Image in both the light propagation direction and the direction orthogonal to it.
Characterized by a big thing.
【００１０】前記構成によれば、凹凸形状によって形成
される再生像を光の伝搬方向及びそれと直交する方向、
即ち２次元的に拡大して形成できる。According to the above structure, the reproduced image formed by the uneven shape is transmitted in the light propagation direction and the direction orthogonal thereto,
That is, it can be two-dimensionally enlarged and formed.
【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は本発明のデータ記録媒体の第１の実
施の形態（但し、特許請求の範囲には含まれない。）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は光検出器である。FIG. 1 shows a first embodiment of the data recording medium of the present invention (however, it is not included in the scope of the claims) , in which 11 is a substrate such as a card and 12 is a substrate. An optical waveguide layer, 13 is a holding layer, 14 is an uneven line (shape), 21 is an optical system, and 22 is a photodetector.
【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２３を作成する。
この入射光２３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２３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２４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, laser light from a laser (not shown) is shaped and condensed by the optical system 21 or the like to create incident light 23.
This incident light 23 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 23 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 24. 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】この時、光導波層１２の厚さとしては０．
５μｍから２μｍが好適であり、保持層１３の厚さとし
ては１０μｍから１００μｍが好適である。また、それ
らの屈折率の差ｄｎを０．０００５から０．００２程度
にすることが光を導波させるために好適である。また、
凹凸線１４としてはその幅を０．０５μｍから０．２μ
ｍにすることが好適であり、屈折率差ｄｎと凹凸の深さ
とを掛けた値が波長の１／１００から１／１０００とな
ることが好適である。At this time, the thickness of the optical waveguide layer 12 is 0.
The thickness of the holding layer 13 is preferably 5 μm to 2 μm, and the holding layer 13 is preferably 10 μm to 100 μm. Further, it is preferable that the difference dn of the refractive indexes between them is about 0.0005 to 0.002 in order to guide light. Also,
The width of the uneven line 14 is 0.05 μm to 0.2 μm.
It is preferable to set m, and it is preferable that the value obtained by multiplying the refractive index difference dn and the depth of the unevenness is 1/100 to 1/1000 of the wavelength.
【００１６】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 layer 12 and the holding layer 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.
【００１７】図２は本実施の形態における凹凸線の形成
状態を表すために、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散乱光の出方を説明
するものである。FIG. 2 is a view of the optical waveguide layer viewed from above in order to show the formation state of the uneven lines in the present embodiment.
In addition, FIG. 3 illustrates how scattered light is emitted in the present embodiment.
【００１８】中心付近の領域３１では、凹凸線１４の間
隔（繰り返しピッチ）を光導波層１２を伝搬する光の波
長に合わせてある。このような領域３１を一つの記録単
位として扱うことができる。この付近からの散乱光は、
図３（ａ）に示すように位相が揃っており、記録面（光
導波層）に対して垂直方向に強い光４１が伝搬する。In the region 31 near the center, the interval (repetition pitch) of the uneven lines 14 is adjusted to the wavelength of light propagating in the optical waveguide layer 12. Such an area 31 can be treated as one recording unit. The scattered light from this vicinity is
As shown in FIG. 3A, the phases are aligned, and strong light 41 propagates in the direction perpendicular to the recording surface (optical waveguide layer).
【００１９】また、図２の左側の光の伝搬方向の上流側
の領域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（ａ）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。In the region 32 on the upstream side in the light propagation direction on the left side of FIG. 2, the interval between the uneven lines 14 is set shorter than the wavelength of the light propagating through the optical waveguide layer 12. Therefore, the scattered light from this vicinity has a light phase that advances toward the right side of the drawing, and if these lights are combined, as shown in FIG. The light 42 propagates (but with respect to the drawing).
【００２０】同様に、図２の右側の光の伝搬方向の下流
側の領域３３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（ａ）に示すよう
に、記録面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４３となる。Similarly, in the region 33 on the downstream side in the light propagation direction on the right side of FIG. 2, the interval between the uneven lines 14 is made longer than the wavelength of the light propagating through the optical waveguide layer 12. Therefore, the light from this vicinity is delayed in the phase of light toward the right side of the drawing, and when these lights are combined, as shown in FIG. 3A, from the direction perpendicular to the recording surface to the right direction ( However, it becomes the light 43 that propagates (in the drawing).
【００２１】従って、光導波層１２の表面に形成する凹
凸線１４を、光導波層の所定の位置を中心として、当該
所定の位置から光の伝搬方向の上流に向かっては、当該
所定の位置の繰り返しピッチより小さいピッチ間隔で形
成し、当該所定の位置から光の伝搬方向の下流に向かっ
ては、当該所定の位置の繰り返しピッチより大きいピッ
チ間隔で形成することで、図３（ｂ）に示すように光の
伝搬方向に拡大された再生像が得られる。Therefore, the concavo-convex line 14 formed on the surface of the optical waveguide layer 12 is centered at a predetermined position of the optical waveguide layer and extends from the predetermined position toward the upstream side in the light propagation direction. 3 (b) by forming at a pitch interval smaller than the repeating pitch, and from the predetermined position toward the downstream in the light propagation direction, forming at a pitch interval larger than the repeating pitch at the predetermined position. As shown, a reproduced image enlarged in the light propagation direction is obtained.
【００２２】この時、図２において中心から上流に向か
ってピッチ間隔を連続して狭く形成し、下流に向かって
ピッチ間隔を連続して広く形成することが好適である。
このようにすることで、図３（ｂ）に示すように、光導
波層１２からの光が、疑似焦点４４からの光が広がって
像を拡大する如く再生面４５に再生像４６を形成するこ
とができる。At this time, it is preferable that the pitch interval is continuously narrowed from the center toward the upstream side in FIG. 2, and the pitch interval is continuously widened toward the downstream side.
By doing so, as shown in FIG. 3B, a reproduced image 46 is formed on the reproducing surface 45 so that the light from the optical waveguide layer 12 spreads the light from the pseudo focus 44 to enlarge the image. be able to.
【００２３】なお、再生面４５上に形成される再生像４
６は、凹凸線の長さによる強度と位置を変えることによ
る位相で記録される。再生面４５上の各点の出力はＵ
（ｑ）＝Ａ∬ｇ（ｅ-ikr／ｒ）（１＋ｃｏｓθ）ｄσと
表せる。ここで、ｑは再生面４５の位置であり、Ｕ
（ｑ）は再生面４５の光の波動、Ａは比例定数、ｇは光
導波層１２の各点の強度と位相を表す。また、ｒは光導
波層１２の各点から再生面４５までの距離を表す。θは
光導波層１２の各点の散乱光の出射方向と方向ｒとのな
す角を表す。ｄσは光導波層の各点を表し、積分は光導
波層の全体に亘る面積分を示す。Incidentally, the reproduced image 4 formed on the reproducing surface 45.
6 is recorded by the intensity by the length of the uneven line and the phase by changing the position. The output of each point on the playback surface 45 is U
It can be expressed as (q) = A∬g (e −ikr / r) (1 + cos θ) dσ. Here, q is the position of the reproduction surface 45, and U
(Q) represents a wave of light on the reproducing surface 45, A represents a proportional constant, and g represents intensity and phase of each point of the optical waveguide layer 12. Further, r represents the distance from each point of the optical waveguide layer 12 to the reproducing surface 45. θ represents the angle between the outgoing direction of the scattered light at each point of the optical waveguide layer 12 and the direction r. dσ represents each point of the optical waveguide layer, and the integral represents the area over the entire optical waveguide layer.
【００２４】図４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
ける凹凸線の形成状態を表すために、光導波層を上から
見た状態を示している。また、図５は本実施の形態にお
ける散乱光の出方を説明するものである。FIG. 4 shows a second embodiment of the data recording medium of the present invention. Similar to FIG. 2, in order to show the formation state of the uneven lines in the present embodiment, the optical waveguide layer is shown from above. It shows the condition as seen. In addition, FIG. 5 illustrates how scattered light is emitted in the present embodiment.
【００２５】図４において、５１は中心領域であり、光
導波層の表面に形成する凹凸線１４を光の伝搬方向と直
角に形成している。また、凹凸線１４の間隔は光導波層
を伝搬する光の波長に等しくあるいは一定の比になるよ
うに形成されている。ここで、凹凸線１４の長さでこの
領域５１からの光の強度を示し、凹凸線１４の位置で位
相を与えることができる。In FIG. 4, reference numeral 51 denotes a central region, in which the uneven lines 14 formed on the surface of the optical waveguide layer are formed at right angles to the light propagation direction. Further, the interval between the uneven lines 14 is formed so as to be equal to or constant at the wavelength of the light propagating through the optical waveguide layer. Here, the length of the uneven line 14 indicates the intensity of light from this region 51, and the phase can be given at the position of the uneven line 14.
【００２６】領域５２は、光の伝搬方向の下流に向かっ
て中心より右側に位置しており、凹凸線１４の右側を光
の伝搬方向の下流側に傾けて設けている。これによっ
て、図５に示すように、光の伝搬方向の上流側から見
て、領域５２からの散乱光は凹凸線の左側に比べて右側
の位相が遅れることになり、右側に伝搬していくように
なる。The region 52 is located on the right side of the center toward the downstream in the light propagating direction, and the right side of the uneven line 14 is provided so as to be inclined to the downstream side in the light propagating direction. As a result, as shown in FIG. 5, when viewed from the upstream side in the light propagation direction, the phase of the scattered light from the region 52 on the right side is delayed compared to the left side of the uneven line, and propagates to the right side. Like
【００２７】同様に、領域５３は、光の伝搬方向の下流
に向かって中心より左側に位置しており、凹凸線１４の
左側を光の伝搬方向の下流側に傾けて設けている。これ
によって、図５に示すように、光の伝搬方向の上流側か
ら見て、領域５３からの散乱光は凹凸線の右側に比べて
左側の位相が遅れることになり、左側に伝搬していくよ
うになる。Similarly, the region 53 is located on the left side of the center toward the downstream in the light propagating direction, and the left side of the uneven line 14 is provided so as to be inclined to the downstream side in the light propagating direction. As a result, as shown in FIG. 5, when viewed from the upstream side in the light propagation direction, the phase of the scattered light from the region 53 on the left side is delayed compared to the right side of the uneven line, and propagates to the left side. Like
【００２８】従って、領域５１から領域５２に向かって
凹凸線１４の傾きを徐々に大きくし、領域５１から領域
５３に向かって凹凸線１４の傾きを徐々に大きくするこ
とで、この上方に形成するホログラム像を光の伝搬方向
に対する左右方向、即ち光の伝搬方向と直交する方向に
拡大することができる。Therefore, the slope of the concave-convex line 14 is gradually increased from the region 51 to the region 52, and the slope of the concave-convex line 14 is gradually increased from the region 51 to the region 53 so that the concave-convex line 14 is formed above this. The hologram image can be magnified in the left-right direction with respect to the light propagation direction, that is, in the direction orthogonal to the light propagation direction.
【００２９】図６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、ここでは第２の実施の形態にお
ける凹凸線の傾きを階段状の凹凸線で実現した例を示
す。即ち、１４’は階段状に配置された多数の凹凸線で
あり、これによって、強度を表す場合の長さと位相を、
斜めの線なしで実現することができ、媒体作製時（情報
記録時）の凹凸線の形成を高精度なＸ，Ｙ方向の送りの
みで実現できる。FIG. 6 shows a third embodiment of the data recording medium of the present invention. Here, an example is shown in which the slope of the uneven line in the second embodiment is realized by a step-like uneven line. That is, 14 'is a large number of uneven lines arranged in a staircase, whereby the length and phase in the case of expressing the strength are
It can be realized without oblique lines, and uneven lines can be formed at the time of manufacturing a medium (at the time of recording information) only by highly accurate feeding in the X and Y directions.
【００３０】図７は本発明のデータ記録媒体の第４の実
施の形態、即ち第１と第２の実施の形態を組み合わせた
ものである。FIG. 7 shows a fourth embodiment of the data recording medium of the present invention, that is, a combination of the first and second embodiments.
【００３１】中心付近の領域６１では、凹凸線の間隔を
光導波層を伝搬する光の波長に合わせてある。従って、
この付近からの散乱光は光の位相が揃っており、記録面
に対して垂直方向に伝搬する。In the region 61 near the center, the interval between the uneven lines is adjusted to the wavelength of the light propagating through the optical waveguide layer. Therefore,
The scattered light from this vicinity has the same light phase and propagates in the direction perpendicular to the recording surface.
【００３２】また、図の左側の光の伝搬方向の上流側の
領域６４，６７，６９では、凹凸線の間隔を光導波層を
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、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。Further, in the regions 64, 67, 69 on the upstream side in the light propagation direction on the left side of the figure, the interval between the uneven lines is made shorter than the wavelength of the light propagating through the optical waveguide layer. Therefore, the scattered light from this vicinity has a light phase that advances toward the right side of the drawing, and when these lights are combined, they propagate from the direction perpendicular to the recording surface to the left (however, with respect to the drawing). To do.
【００３３】同様に、図の右側の光の伝搬方向の下流側
の領域６５，６６，６８では、凹凸線の間隔を光導波層
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、記録面に対して垂直
方向から右方向（但し、図面に対して）に伝搬する。Similarly, in the regions 65, 66 and 68 on the downstream side in the light propagation direction on the right side of the figure, the interval between the uneven lines is made longer than the wavelength of the light propagating through the optical waveguide layer. Therefore, the scattered light from this vicinity is delayed in the phase of light toward the right side of the drawing, and when these lights are combined, they propagate from the direction perpendicular to the recording surface to the right direction (but to the drawing). To do.
【００３４】また、図の下側の領域６２，６６，６７
は、光の伝搬方向の下流に向かって中心より右側に位置
しており、凹凸線の右側を光の伝搬方向の下流側に傾け
て設けている。これによって、領域６２，６６，６７か
らの散乱光は凹凸線の左側に比べて右側の位相が遅れる
ことになり、右側に伝搬していくようになる。Further, areas 62, 66, 67 on the lower side of the figure
Is located on the right side of the center toward the downstream side in the light propagation direction, and the right side of the uneven line is provided so as to be inclined toward the downstream side in the light propagation direction. As a result, the scattered light from the regions 62, 66, 67 is delayed in phase on the right side of the uneven line, and propagates to the right side.
【００３５】同様に、図の上側の領域６３，６８，６９
は、光の伝搬方向の下流に向かって中心より左側に位置
しており、凹凸線の左側を光の伝搬方向の下流側に傾け
て設けている。これによって、領域６３，６８，６９か
らの散乱光は凹凸線の右側に比べて左側の位相が遅れる
ことになり、左側に伝搬していくようになる。Similarly, the upper regions 63, 68, 69 in the figure
Is located on the left side of the center toward the downstream in the light propagation direction, and the left side of the uneven line is provided so as to be inclined to the downstream side in the light propagation direction. As a result, the scattered light from the regions 63, 68, 69 is delayed in phase on the left side as compared with the right side of the uneven line, and propagates to the left side.
【００３６】従って、領域６４から領域６５に、領域６
９から領域６８に、領域６７から領域６６に向かって光
導波層の表面に形成する凹凸線を、所定の位置を中心と
して、光の伝搬方向の上流に向かって小さいピッチ間隔
で形成し、伝搬方向の下流に向かって大きいピッチ間隔
で形成し、また、領域６１から領域６２に、領域６４か
ら領域６７に、領域６５から領域６６に向かって光導波
層の表面に形成する凹凸線を、所定の位置を中心とし
て、凹凸線の右側を光の伝搬方向の下流側に傾け、領域
６１から領域６３に、領域６４から領域６９に、領域６
５から領域６８に向かって光導波層の表面に形成する凹
凸線を、所定の位置を中心として、凹凸線の左側を光の
伝搬方向の下流側に傾けることで、この上方に形成する
ホログラム像を光の伝搬方向及びこれと直交する方向、
即ち２次元的に大きくすることができる。Therefore, from the area 64 to the area 65, the area 6
9 to the region 68, uneven lines formed on the surface of the optical waveguide layer from the region 67 to the region 66 are formed at a small pitch interval upstream from the predetermined position in the light propagation direction to propagate the light. The concave-convex lines formed on the surface of the optical waveguide layer from the region 61 to the region 62, the region 64 to the region 67, and the region 65 to the region 66 on the surface of the optical waveguide layer are formed at predetermined intervals in the downstream direction. Centering on the position of, the right side of the uneven line is inclined to the downstream side in the light propagation direction, and the region 61 to the region 63, the region 64 to the region 69, the region 6
5 to the region 68, the uneven line formed on the surface of the optical waveguide layer is inclined from the predetermined position to the left side of the uneven line toward the downstream side in the light propagating direction. The direction of light propagation and the direction orthogonal to this,
That is, it can be increased two-dimensionally.
【００３７】なお、ここでは領域６１を記録する領域の
中心として説明したが、上下左右の中心からずれた位置
に中心が来ても良い。また。中心が一つの面内に複数あ
っても良い。また、ここでは第１と第２の実施の形態の
組み合わせを示したが、第１と第３の実施の形態を組み
合わせることで縦横の凹凸線のみで同様のデータ記録媒
体を実現できる。また、各記録領域の単位内では凹凸線
の長さ（切れている場合にはそのトータルの長さ）によ
り強度を表し、位置を変えることにより位相を表してい
る。Although the area 61 is described as the center of the recording area here, the center may be located at a position deviated from the center of the vertical and horizontal directions. Also. There may be multiple centers in one plane. Although the combination of the first and second embodiments is shown here, the same data recording medium can be realized only by the vertical and horizontal uneven lines by combining the first and third embodiments. In addition, in the unit of each recording area, the strength is represented by the length of the uneven line (or the total length of the uneven line), and the phase is represented by changing the position.
【００３８】[0038]
【発明の効果】以上説明したように、本発明によれば、
記録層に記録された情報を拡大して検出することがで
き、検出器のセルサイズに比べて、小さい領域に記録を
行うことができ、高密度な信号記録が実現できる。ま
た、記録層を多層にすることができ、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できる。As described above, according to the present invention,
The information recorded in the recording layer can be enlarged and detected, recording can be performed in a smaller area than the cell size of the detector, and high-density signal recording can be realized. Further, the recording layers can be multi-layered, and by laminating them, a lot of information can be densely recorded.
【図１】本発明のデータ記録媒体の第１の実施の形態を
示す構成図FIG. 1 is a configuration diagram showing a first embodiment of a data recording medium 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散乱光の出方の説明
図FIG. 3 is an explanatory diagram of how scattered light appears in the first embodiment.
【図４】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. 4 is an explanatory diagram showing a second embodiment of a data recording medium of the present invention.
【図５】第２の実施の形態における散乱光の出方の説明
図FIG. 5 is an explanatory diagram of how scattered light appears in the second embodiment.
【図６】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. 6 is an explanatory diagram showing a third embodiment of a data recording medium of the present invention.
【図７】本発明のデータ記録媒体の第４の実施の形態を
示す説明図FIG. 7 is an explanatory diagram showing a fourth embodiment of a data recording medium of the present invention.
１１：基板、１２：光導波層、１３：保持層、１４，１
４’：凹凸線、１５：傾斜端面、２１：光学系、２２：
光検出器、２３：入射光、２４，４１〜４３：散乱光、
３１〜３３，５１〜５３，６１〜６９：領域。11: substrate, 12: optical waveguide layer, 13: holding layer, 14, 1
4 ': uneven line, 15: inclined end face, 21: optical system, 22:
Photodetector, 23: incident light, 24, 41-43: scattered light,
31-33, 51-53, 61-69: areas.
───────────────────────────────────────────────────── 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９−101735（ＪＰ，Ａ) 特開 平７−169088（ＪＰ，Ａ) 特開 平３−15003（ＪＰ，Ａ) 特開 昭62−103681（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G11B 7/09 G03H 1/02 G11B 7/0065 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Iku Takeshi Yagi 2-3-3 Otemachi, Chiyoda-ku, Tokyo Inside Nippon Telegraph and Telephone Corporation (56) References JP-A-9-101735 (JP, A) Kaihei 7-169088 (JP, A) JP-A-3-15003 (JP, A) JP-A-62-103681 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) G11B 7 / 09 G03H 1/02 G11B 7/0065
Claims (5)
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
形成された凹凸形状であり、 前記凹凸形状の繰り返しピッチは前記光導波層を伝搬す
る光の波長程度であり、 かつ前記光導波層の所定の位置を中心として、当該所定
の位置から光の伝搬方向の下流に向かって右側では、凹
凸形状の右側を光の伝搬方向の下流側に傾けて凹凸線の
左側に比べて右側の散乱光の位相が遅れるようにし、当
該所定の位置から光の伝搬方向の下流に向かって左側で
は、凹凸形状の左側を光の伝搬方向の下流側に傾けて凹
凸線の右側に比べて左側の散乱光の位相が遅れるように
することで、 上方に形成する像を光の伝搬方向と直交する方向に拡大
する 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. The concave and convex shapes are repeated, and the repeating pitch of the concave and convex shapes is about the wavelength of light propagating in the optical waveguide layer, and with respect to the predetermined position of the optical waveguide layer, the propagation direction of the light from the predetermined position. On the right side toward the downstream side, tilt the right side of the uneven shape to the downstream side in the light propagation direction, and
The phase of the scattered light on the right side is delayed compared to the left side, and the left side of the uneven shape is recessed by inclining the left side of the uneven shape toward the downstream side in the light propagation direction from the predetermined position toward the downstream side in the light propagation direction.
The phase of the scattered light on the left side is delayed compared to the right side of the convex line
By doing so, the image formed above is enlarged in the direction orthogonal to the light propagation direction.
A data recording medium characterized by:
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
形成された凹凸形状であり、 前記凹凸形状の繰り返しピッチは前記光導波層を伝搬す
る光の波長程度であり、 かつ前記光導波層の所定の位置を中心として、当該所定
の位置から光の伝搬方向の上流に向かっては、当該所定
の位置の繰り返しピッチより小さいピッチ間隔で前記凹
凸形状を形成し、当該所定の位置から光の伝搬方向の下
流に向かっては、当該所定の位置の繰り返しピッチより
大きいピッチ間隔で前記凹凸形状を形成し、 さらに前記光導波層の所定の位置を中心として、当該所
定の位置から光の伝搬方向の下流に向かって右側では、
凹凸形状の右側を光の伝搬方向の下流側に傾けて凹凸線
の左側に比べて右側の散乱光の位相が遅れるようにし、
当該所定の位置から光の伝搬方向の下流に向かって左側
では、凹凸形状の左側を光の伝搬方向の下流側に傾けて
凹凸線の右側に比べて左側の散乱光の位相が遅れるよう
にすることで、 上方に形成する像を光の伝搬方向及びこれと直交する方
向の双方に拡大する 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. The concave and convex shapes are repeated, and the repeating pitch of the concave and convex shapes is about the wavelength of light propagating in the optical waveguide layer, and with respect to the predetermined position of the optical waveguide layer, the propagation direction of the light from the predetermined position. The concavo-convex shape is formed at a pitch interval smaller than the repetition pitch at the predetermined position in the upstream direction, and the repetition pitch at the predetermined position in the downstream direction in the light propagation direction from the predetermined position. Forming the uneven shape at a larger pitch interval, further centered on a predetermined position of the optical waveguide layer, on the right side toward the downstream in the light propagation direction from the predetermined position,
Uneven lines on the right side of the concave-convex shape inclined to the downstream side in the propagation direction of the light
The phase of the scattered light on the right side is delayed compared to the left side of
On the left side from the predetermined position toward the downstream in the light propagation direction, the left side of the uneven shape is inclined to the downstream side in the light propagation direction.
The phase of the scattered light on the left side is delayed compared to the right side of the uneven line
By setting, the image formed above is directed in the direction of light propagation and in the direction orthogonal to this.
A data recording medium that is characterized by expanding in both directions .
に変化していることを特徴とする請求項２記載のデータ
記録媒体。3. The data recording medium according to claim 2, wherein the repeating pitch of the concavo-convex shape continuously changes.
いることを特徴とする請求項１乃至３のいずれかに記載
のデータ記録媒体。4. A data recording medium according to any one of claims 1 to 3, characterized in that the inclination of the uneven shape is continuously changed.
によって形成されていることを特徴とする請求項１乃至
４のいずれかに記載のデータ記録媒体。Claim inclination of claim 5 wherein said irregularities characterized by being formed by a step-like irregularities 1
4. The data recording medium according to any one of 4 above.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23159199A JP3530082B2 (en) | 1999-08-18 | 1999-08-18 | Data recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23159199A JP3530082B2 (en) | 1999-08-18 | 1999-08-18 | Data recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001056943A JP2001056943A (en) | 2001-02-27 |
| JP3530082B2 true JP3530082B2 (en) | 2004-05-24 |
Family
ID=16925928
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23159199A Expired - Fee Related JP3530082B2 (en) | 1999-08-18 | 1999-08-18 | Data recording medium |
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| JP (1) | JP3530082B2 (en) |
Families Citing this family (1)
| 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 |
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| Publication number | Publication date |
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| JP2001056943A (en) | 2001-02-27 |
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