JPH01102755A - Optical information recording medium - Google Patents
Optical information recording mediumInfo
- Publication number
- JPH01102755A JPH01102755A JP62259750A JP25975087A JPH01102755A JP H01102755 A JPH01102755 A JP H01102755A JP 62259750 A JP62259750 A JP 62259750A JP 25975087 A JP25975087 A JP 25975087A JP H01102755 A JPH01102755 A JP H01102755A
- Authority
- JP
- Japan
- Prior art keywords
- pattern
- transmittance
- reflectance
- information recording
- recording medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims description 40
- 238000002834 transmittance Methods 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 abstract description 6
- 238000002310 reflectometry Methods 0.000 abstract 4
- 230000003252 repetitive effect Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 10
- 238000009826 distribution Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 238000000151 deposition Methods 0.000 description 3
- 238000003384 imaging method Methods 0.000 description 3
- 230000004907 flux Effects 0.000 description 2
- 230000031700 light absorption Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000002985 plastic film Substances 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000007723 transport mechanism Effects 0.000 description 2
- 108091093088 Amplicon Proteins 0.000 description 1
- 239000011358 absorbing material Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Landscapes
- Credit Cards Or The Like (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は光学的に情報が記録される光情報記録媒体に関
し、特に反射率又は透過率が二値的に変化する明暗のく
り返しパターンによって情報が記録された光情報記録媒
体に関する。Detailed Description of the Invention [Industrial Application Field] The present invention relates to an optical information recording medium in which information is recorded optically, and in particular, information is recorded by a repeating pattern of light and dark in which reflectance or transmittance changes binary. The present invention relates to an optical information recording medium on which is recorded.
［従来の技術］
近年、高密度光情報記録両生として光ディスク、光カー
ド等の記録媒体及び記録ｉｊ生装置が登場している。こ
の様な記録媒体には主に二値化された情報が、ビットや
明暗のパターンなどで記録され、再生は、読出し用光束
をこれらビットやパターン列に照Ｑ４Ｌ、、光の反射、
回折、偏光等の諸物理現象の変化として所定の検出器で
情報を読出ずようになっている。[Prior Art] In recent years, recording media such as optical disks and optical cards and recording devices have appeared as high-density optical information recording devices. Binarized information is mainly recorded in such recording media as bits or bright/dark patterns, and reproduction is performed by shining a readout light beam onto these bits or pattern strings.
Information cannot be read out by a given detector due to changes in various physical phenomena such as diffraction and polarization.
以下、そのような記録媒体として光カードを取上げその
従来例を説明する。Hereinafter, a conventional example of an optical card will be explained as such a recording medium.
同一の情報の記録されているカードを大ｆＴｌに製造す
る場合にはＳＮ比が高く、且つ製造の容易な上記再生の
み可能な再生専用光カード（以下、光ＲＯＭカードと称
する）が好適に使用される。When manufacturing a card with a large fTl on which the same information is recorded, it is preferable to use a read-only optical card (hereinafter referred to as an optical ROM card) that can only be used for playback, as it has a high SN ratio and is easy to manufacture. be done.
この先１？ ＯＭカードは、例えば次の様にして製造さ
れる。例えば厚さ数百μｍ程度のプラスチック製基根上
にＴｅ等の低反射率金属からなる蒸着膜を形成し、該蒸
着膜上に上記のような情報バターンに対応するマスクを
載置し、その上からＣｕ等の高反射率金属を蒸着し、更
に該低反射率金属膜及びパターン状高反射率金属膜に厚
さ数百μｍ程度の光学的に透明なプラスチックフィルム
をラミネートして保護膜を形成する。1 in the future? The OM card is manufactured, for example, as follows. For example, a vapor-deposited film made of a low-reflectance metal such as Te is formed on a plastic base with a thickness of about several hundred μm, a mask corresponding to the information pattern as described above is placed on the vapor-deposited film, and then A high reflectance metal such as Cu is vapor-deposited from the film, and an optically transparent plastic film with a thickness of several hundred μm is then laminated on the low reflectance metal film and the patterned high reflectance metal film to form a protective film. do.
第６図はト記光ＲＯＭカードの一例の断面を示した図で
ある。同図において、５０は゛プラスチック製基板、５
１は低反射率金属の蒸着膜、５２は高反射率の情報記録
膜であり、情報信号に応じて記録ビット５８が形成され
ており、５３は保護層である透明なプラスチックフィル
ム、５４は傷防止用の表面硬化層である。この光ＲＯＭ
カードを機能的に大別すれば、カード基板部５５、情報
記録層（面）５６、透明プラスチック保護層５７から構
成されていると言える。FIG. 6 is a cross-sectional view of an example of an optical ROM card. In the same figure, 50 is a plastic substrate;
1 is a vapor-deposited film of low reflectance metal, 52 is a high reflectance information recording film, on which recording bits 58 are formed according to the information signal, 53 is a transparent plastic film that is a protective layer, and 54 is a scratch This is a hardened surface layer for prevention. This light ROM
If the card is roughly classified functionally, it can be said that it is composed of a card substrate section 55, an information recording layer (surface) 56, and a transparent plastic protective layer 57.
第７図は上記光ＲＯＭカード再生装置？１の概略構成図
である。Is Fig. 7 the optical ROM card reproducing device mentioned above? 1 is a schematic configuration diagram of FIG.
同図において、ＬＥＤ等の照明光源６１からの光がレン
ズ６２によって集光され、情報が記録されている光カー
ドｌ上のパターン列を照射する。In the figure, light from an illumination light source 61 such as an LED is focused by a lens 62 and illuminates a pattern array on an optical card l on which information is recorded.
照’Ｊ−ｔされたパターン列の像は結像レンズ６：３に
よりセンサ６４１−に結像される。センサ６４は例えば
１次元ＣＣＤの様なものでセンサー上の入射光：１【の
強弱に比例した電気信号を出力するものである。また、
光１７０Ｍカード１は回転機構６０によって欠目ｊΔ方
向に移動され、図中点線で囲んだ部分で光ヘッド６５が
構成されている。The image of the illuminated pattern row is formed on the sensor 641- by the imaging lens 6:3. The sensor 64 is, for example, a one-dimensional CCD, and outputs an electric signal proportional to the intensity of the incident light on the sensor. Also,
The optical 170M card 1 is moved in the direction of the notch jΔ by the rotation mechanism 60, and the optical head 65 is formed by the part surrounded by the dotted line in the figure.
第８図は第７図に示した光ＲＯＭカードｌの構成の一例
を示す九カードの平面図である。FIG. 8 is a plan view of an optical ROM card 1 showing an example of the configuration of the optical ROM card 1 shown in FIG.
第６図に示した情報記録面５６の記録ビット５８は第８
図の様に例えば数個ないし数１個を１つの情Ｊｆ４ｊ
ｉｉｉ位としてアレイ状に配列されたトラック４５を構
成し、該トラックは帯状に並びバンド４６を形成する。The recording bit 58 of the information recording surface 56 shown in FIG.
As shown in the figure, for example, several or one number can be combined into one information Jf4j
Tracks 45 are arranged in an array as the third position, and the tracks are arranged in a band shape to form a band 46.
該トラックは結像レンズ６３によってセンサー６４の受
光面上に投影される。センサー６４は前述したように１
１；１記トラツクと平行な走査方向を有する一次元ＣＣ
Ｄであって、前記トラックの投影像の光量の強弱を電気
的に走査して電気信号に変換する。光ＲＯＭカードｌは
カード搬送機構６０によって前記ＣＣＤ６４の走査方向
とほぼ直角な副走査方向に連続又は間欠的に搬送され、
次々に異なるトラックが前記ＣＣｆ）６４面」二に投影
される。この様な手順で前記副走査方向の一定領域の情
報読取りが終了すると、光ヘツド部は不図示の駆動機構
によって副走査方向と直交する方向に一定距離だけ離れ
た第２の読取り領域まで移動され、そこで静止する。再
びカード搬送機構が働き、前記第２の読取り領域の情報
読取りが行なわれる。この様な手順で情報記録面５６上
を二次元的に走査することにより光ｒ？ ＯＭカード１
上の必要な領域の情報読出しが行われる。The track is projected onto the light receiving surface of the sensor 64 by the imaging lens 63. The sensor 64 is 1 as described above.
1; One-dimensional CC with a scanning direction parallel to the track described in 1.
D, the intensity of the light amount of the projected image of the track is electrically scanned and converted into an electrical signal. The optical ROM card l is continuously or intermittently transported by a card transport mechanism 60 in a sub-scanning direction substantially perpendicular to the scanning direction of the CCD 64,
Different tracks are successively projected onto the CCf)64 plane. When the reading of information in a certain area in the sub-scanning direction is completed in this manner, the optical head is moved by a drive mechanism (not shown) to a second reading area a certain distance away in a direction perpendicular to the sub-scanning direction. , it stops there. The card transport mechanism operates again, and the information in the second reading area is read. By scanning the information recording surface 56 two-dimensionally in this manner, the light r? OM card 1
Information is read from the necessary area above.
第９図は従来の光カード上のパターン配列と一次元セン
サの主走査方向との相対位置関係を示す図である。FIG. 9 is a diagram showing the relative positional relationship between the pattern arrangement on a conventional optical card and the main scanning direction of a one-dimensional sensor.
同図において、斜線部１０，１２．１４が反射率が低（
、白ぬき部９．１１．１３では反射率が相対的に高くな
っている部分である。また、画部分共に番号が大きくな
るに従って、空間周波数が高くなっている。矢印８は一
次元センサーの主走査方向で、この方向の光計変化を読
取るものとする。In the figure, the shaded areas 10, 12, and 14 have low reflectance (
, white areas 9, 11, and 13 are areas where the reflectance is relatively high. Furthermore, as the number increases in both image areas, the spatial frequency increases. Arrow 8 is the main scanning direction of the one-dimensional sensor, and the light meter changes in this direction are read.
第１０図は、第９図で示したパターンを−・次元センサ
ーで読取った出力信号波形を示し、横軸が位置、縦軸が
光量（出力）を表わす。FIG. 10 shows an output signal waveform obtained by reading the pattern shown in FIG. 9 with a -dimensional sensor, where the horizontal axis represents the position and the vertical axis represents the amount of light (output).
同図において、実線は得られた出力波形、点線は元のパ
ターン−Ｌの光；１先（反射率）分布である。In the figure, the solid line is the obtained output waveform, and the dotted line is the original pattern-L light; 1-point (reflectance) distribution.
［発明が解決しようとしている問題点］しかしながら、
１１ｉ１記従来例では第１０図に示す様に、検出波形を
設定したあるしきい値で二値化する場合、得られる明及
び暗部の幅９”〜１４”は、“カード上に記録されてい
る幅９゛〜１４° と異なってしまう現象が生じる。こ
の程度はパターンのくり返し周波数が高い程その差は大
きくなる。これは、パターンの周波数が高くなるほど、
そこで光が回折されて結像レンズ開口からもれる光ｉ１
が大きくなるためである。[Problem that the invention seeks to solve] However,
11i1 In the conventional example, as shown in FIG. A phenomenon occurs in which the width differs from 9° to 14°.The higher the repetition frequency of the pattern, the larger the difference becomes.This is because the higher the frequency of the pattern,
There, the light is diffracted and leaks from the imaging lens aperture i1
This is because it becomes larger.
このため、従来の光学的情報記録媒体では、信号の読取
り誤差が生じ易くなる欠点があった。For this reason, conventional optical information recording media have the disadvantage that signal reading errors tend to occur.
［問題点を解決するための手段］
本発明の目的は、１１訂述の信号の読取り誤差をなくす
ことのできる光学的情報記録媒体を提供することにある
。[Means for Solving the Problems] An object of the present invention is to provide an optical information recording medium that can eliminate signal reading errors described in the 11th edition.
以−Ｌのよりな［１的は、反射率又は透過率が二値的に
変化する明暗の繰り返しパターンによって、情報が記録
された光学的情報記録媒体において、前記明暗の繰り返
しパターンの周波数に対応して前記明暗の反射率又は透
過率を変化させたことを特徴とする光学的情報記録媒体
により達成される。[1] In an optical information recording medium in which information is recorded by a repeating pattern of light and dark in which the reflectance or transmittance changes binary, the medium corresponds to the frequency of the repeating pattern of light and dark. This is achieved by an optical information recording medium characterized in that the bright and dark reflectance or transmittance is changed.
なお、前記明暗の反射率又は透過率を変化させる方法と
しては、白黒パターンの白黒を周波数に応じて多数回蒸
着すること（例えば、白の部分は反射用物質を多数回蒸
着することにより反射率を変化させ、黒の部分の場合は
光吸収物質を多数回蒸着することにより光吸収率を変化
させる方法）や、白および／または黒のそれぞれの同一
周波数部分に微細構造の明暗パターンを設けることによ
り明暗の反射率又は透過率を変化させる方法等がある。In addition, as a method of changing the reflectance or transmittance of the bright and dark areas, the black and white pattern of the black and white pattern is deposited multiple times depending on the frequency (for example, the reflectance of the white part is changed by depositing a reflective substance multiple times). (in the case of black areas, the light absorption rate is changed by depositing a light absorbing material multiple times), or by providing light and dark patterns of fine structures in the same frequency areas of white and/or black. There is a method of changing the reflectance or transmittance of brightness and darkness.
［作用］
一１記のような光掌的情・原記録媒体によれば、光情報
記録媒体」−の白黒パターンの反射率又は透過率をパタ
ーンの周波数に応じて変化させることにより、得られる
信号波形をあるしきい値で二値化した場合に、その明暗
幅が、元の幅と同一になる様にすることができ、ｌｊ生
信号の品位を向上させることが可能となる。[Function] According to the optical information recording medium as described in Section 11, the optical information recording medium can be obtained by changing the reflectance or transmittance of the black and white pattern according to the frequency of the pattern. When a signal waveform is binarized using a certain threshold value, the brightness width can be made to be the same as the original width, and the quality of the lj raw signal can be improved.
［実施例］
以ド、本発明の光学的情報記録媒体について具体的な実
施例に基づき詳細に説明する。[Examples] Hereinafter, the optical information recording medium of the present invention will be described in detail based on specific examples.
第４図は、本発明による光情報記録媒体との反射率分布
と該光情報記録媒体によって得られる信号波形とを第１
Ｏ図と同様に示したものである。FIG. 4 shows the reflectance distribution of the optical information recording medium according to the present invention and the signal waveform obtained by the optical information recording medium.
It is shown in the same way as Figure O.
同図において１点線３０ａ、３０ｂ、３０ｃはそれぞれ
媒体上パターンの反射率分布、実線は得られる信号波形
３１を示す。同図の様に、パターンのくり返し周波数が
、高くなるに従って、その部分の反射率を３０ａ、３０
ｂ、３０ｃの順に高くすれば、得られる信号波形をある
しきい値で二値化した場合、回折による光量もれが生じ
てもその明暗幅が１５゛〜２０°は、媒体上に記録しで
ある幅！５〜２０と同じにすることができる。In the figure, dotted lines 30a, 30b, and 30c each indicate the reflectance distribution of the pattern on the medium, and the solid line indicates the obtained signal waveform 31. As shown in the figure, as the repetition frequency of the pattern increases, the reflectance of that part increases by 30a and 30a.
If the values are increased in the order of b and 30c, when the resulting signal waveform is binarized at a certain threshold, even if light leakage occurs due to diffraction, the brightness range of 15° to 20° will not be recorded on the medium. Width that is! It can be the same as 5-20.
本発明は反射光で、情報を読取る場合に限らず、第５図
に示す様にカード２１に光束２４を入射させ、その透過
光量２５分布で信号を読取る場合にも、相対的に透過率
の高い部分２３と低い部分２２の透過率差をパターンの
周波数に応じて変化させれば同様な効果が得られる。The present invention uses reflected light not only when reading information, but also when a light beam 24 is incident on a card 21 as shown in FIG. 5, and a signal is read using the transmitted light amount 25 distribution. A similar effect can be obtained by changing the transmittance difference between the high portion 23 and the low portion 22 according to the frequency of the pattern.
情報記録媒体上の反射率（又は透過率）を、信号記録黒
白パターンの周波数に応じて段階的に変化させるには、
高反射率領域はど、高反射率物質を多数回蒸着するなど
、媒体作製の際に制御することが考えられる。To change the reflectance (or transmittance) on the information recording medium in stages according to the frequency of the signal recording black and white pattern,
It is conceivable to control the high reflectance region when producing the medium, such as by depositing a high reflectance substance multiple times.
また、前記方法では高精度が要求され、コスト高となる
場合には１例えば、第１図に示す様に反射率の高い領域
に信号記録パターンよりもつと細かい（周波数の高い）
微細な黒白パターンを設は該領域での全反射光量が、信
号記録パターンの周波数が高くなる程、多くなる様にす
れば、さらに低コストで実現できる。第１図に示した様
な、周期的な微細構造でなくても、第２図に示す様なラ
ンダムな構造でもよい。なお、前記微細パターンは読取
りレンズのカットオフ周波数よりその周波数が高くなる
様に設定すれば、像面−りのセンサーで検出されず、信
号読取り誤差とはならない。In addition, the above method requires high accuracy, and if the cost is high, 1. For example, as shown in Figure 1, if the signal recording pattern is finer (higher frequency) than the signal recording pattern in the area with high reflectance.
A fine black-and-white pattern can be created at a lower cost by making the amount of total reflection light in the area increase as the frequency of the signal recording pattern increases. It does not have to be a periodic fine structure as shown in FIG. 1, but may be a random structure as shown in FIG. 2. If the fine pattern is set so that its frequency is higher than the cutoff frequency of the reading lens, it will not be detected by the sensor on the image plane and will not cause a signal reading error.
また、 ＋ｉｉｊ記実施例では、白黒パターンのうち、
自パターンの反射率を信号記録パターンの周波数が高く
なるほど大きくするように構成したが、第３図（ａ）、
（ｂ）に示すように白黒パターンのうち黒パターンの光
吸収性を信号記録パターンの周波数が高くなるほど小さ
くするように構成しても、同様の効果が得られる。これ
は、＋ｉ」記しきい値が白黒パターンの反射率の相対的
な関係において決定するからである。また、当然のこと
ながら、第３図の構成においても黒パターン部を微細な
黒白パターンで変化させるようにしても良い。In addition, in the example described in +iiij, among the black and white patterns,
Although the reflectance of the self-pattern was configured to increase as the frequency of the signal recording pattern increases, as shown in Fig. 3(a),
Similar effects can also be obtained by configuring the light absorption of the black pattern among the black and white patterns to be made smaller as the frequency of the signal recording pattern becomes higher, as shown in FIG. This is because the +i'' threshold value is determined based on the relative relationship between the reflectances of the black and white patterns. Naturally, also in the configuration shown in FIG. 3, the black pattern portion may be changed into a fine black and white pattern.
［発明の効果］
以−Ｆ、説明した様に本発明による光情報記録媒体は、
反射率又は透過率が二値的に変イヒーするバターンのく
り返し周波数に応じて反射率又は透過率が異なるため、
出力波形をあるしきい値で二値化した場合に、周波数に
依らず明暗幅を媒体上に記録されている幅と同一にする
ことができる。[Effects of the Invention] As explained below, the optical information recording medium according to the present invention has the following effects:
Since the reflectance or transmittance varies depending on the repetition frequency of the pattern where the reflectance or transmittance changes binary,
When the output waveform is binarized using a certain threshold value, the brightness width can be made the same as the width recorded on the medium regardless of the frequency.
従って、特に波形の幅を精度良く検出する必要のある変
調方式を用いる場合に有効で、又、装置側では何ら複雑
な構成を用いる必要がなＩ；１ことから回路構成を簡略
化できる効果もある。Therefore, it is particularly effective when using a modulation method that requires accurate detection of the waveform width, and also has the effect of simplifying the circuit configuration since there is no need to use any complicated configuration on the device side. be.
第１図、第２図はそれぞれ本発明に係る光学的情報記録
媒体の白黒パターンを示す図である。
第３図（ａ）、（ｂ）はそれぞれ本発明に係る光学的情
報記録媒体の白黒パターンとそのパターンからの反射光
量分布を示す図である。
第４図は本発明の情報記録媒体から得られる信号及び記
録面一ヒの反射率（又は透過率）分布を示す図である。
第５図は本発明による透過型情報記録媒体の概略説明図
である。
第６図は光ＲＯＭカードの一例の断面を示した図である
。
第７図は上記光ＲＯＭカード両生装置の概略構成図であ
る。
第８図は第７図に示した光ＲＯＭカード１の構成の一例
を示ず゛ト面図である。
第９図は従来の光カード−ヒのパターン配列と一次元セ
ンサの主走査方向との相対位置関係を示す図である。
第１０図は、第９図で示したパターンを−・次元センサ
で読取った出力信号波形を示す図である。
１５〜２０：本発明による情報記録媒体情報面上の明暗
幅、
１５°〜２０° ：本発明の情報記録媒体により得られ
た出力信号波形をある
しきい値で二値化した場合の
明暗幅、
３０ａ、３０ｂ、３０Ｃ：本発明による光情報記録媒体
十の反射率分布
３１：本発明による光情報記録媒体によって得られる信
号波形
２１：透過型情報記録媒体、
２２：透過率の低い部分、
２３：透過率の高い部分、
２４：入射光束、
２゛５：透過光束。
代理人 弁理士 山 下 穣 平
第１図FIGS. 1 and 2 are diagrams showing black and white patterns of an optical information recording medium according to the present invention, respectively. FIGS. 3(a) and 3(b) are diagrams showing a black and white pattern of an optical information recording medium according to the present invention and a distribution of the amount of reflected light from the pattern, respectively. FIG. 4 is a diagram showing the signal obtained from the information recording medium of the present invention and the reflectance (or transmittance) distribution over the recording surface. FIG. 5 is a schematic explanatory diagram of a transmissive information recording medium according to the present invention. FIG. 6 is a diagram showing a cross section of an example of an optical ROM card. FIG. 7 is a schematic configuration diagram of the optical ROM card amplicon device. FIG. 8 is a top view showing an example of the configuration of the optical ROM card 1 shown in FIG. 7. FIG. 9 is a diagram showing the relative positional relationship between the pattern arrangement of a conventional optical card and the main scanning direction of a one-dimensional sensor. FIG. 10 is a diagram showing an output signal waveform obtained by reading the pattern shown in FIG. 9 with a --dimensional sensor. 15 to 20: Brightness and darkness width on the information surface of the information recording medium according to the present invention, 15° to 20°: Brightness and darkness width when the output signal waveform obtained by the information recording medium of the present invention is binarized at a certain threshold value. , 30a, 30b, 30C: Reflectance distribution of the optical information recording medium according to the present invention 31: Signal waveform obtained by the optical information recording medium according to the present invention 21: Transmissive information recording medium, 22: Portion with low transmittance, 23 : portion with high transmittance, 24: incident light flux, 2゛5: transmitted light flux. Agent Patent Attorney Johei Yamashita Figure 1
Claims (2)
返しパターンによって、情報が記録された光学的情報記
録媒体において、 前記明暗の繰り返しパターンの周波数に対応して前記明
暗の反射率又は透過率を変化させたことを特徴とする光
学的情報記録媒体。(1) In an optical information recording medium in which information is recorded by a repeating pattern of light and dark in which the reflectance or transmittance changes binary, the reflectance of the light and dark or the reflectance of the light and dark correspond to the frequency of the repeating pattern of light and dark. An optical information recording medium characterized by varying transmittance.
る同一周波数部分に微細構造の明暗パターンを設けるこ
とによりなされていることを特徴とする特許請求の範囲
第１項記載の光学的情報記録媒体。(2) Optical information according to claim 1, characterized in that the change in bright and dark reflectance or transmittance is achieved by providing a bright and dark pattern with a fine structure in the corresponding same frequency portion. recoding media.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62259750A JPH01102755A (en) | 1987-10-16 | 1987-10-16 | Optical information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62259750A JPH01102755A (en) | 1987-10-16 | 1987-10-16 | Optical information recording medium |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01102755A true JPH01102755A (en) | 1989-04-20 |
Family
ID=17338431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62259750A Pending JPH01102755A (en) | 1987-10-16 | 1987-10-16 | Optical information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01102755A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7828620B2 (en) | 2003-01-09 | 2010-11-09 | Sony Corporation | Method of manufacturing tubular carbon molecule and tubular carbon molecule, method of manufacturing field electron emission device and field electron emission device, and method of manufacturing display unit and display unit |
-
1987
- 1987-10-16 JP JP62259750A patent/JPH01102755A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7828620B2 (en) | 2003-01-09 | 2010-11-09 | Sony Corporation | Method of manufacturing tubular carbon molecule and tubular carbon molecule, method of manufacturing field electron emission device and field electron emission device, and method of manufacturing display unit and display unit |
| US7892063B2 (en) | 2003-01-09 | 2011-02-22 | Sony Corporation | Method of manufacturing tubular carbon molecule and tubular carbon molecule, method of manufacturing recording apparatus and recording apparatus, method of manufacturing field electron emission device and field electron emission device, and method of manufacturing display unit and display unit |
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