JPS605438A - Optical information recording medium - Google Patents
Optical information recording mediumInfo
- Publication number
- JPS605438A JPS605438A JP58112250A JP11225083A JPS605438A JP S605438 A JPS605438 A JP S605438A JP 58112250 A JP58112250 A JP 58112250A JP 11225083 A JP11225083 A JP 11225083A JP S605438 A JPS605438 A JP S605438A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- recording
- light
- recording layer
- deposited
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
Landscapes
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、光学式情報処理装置に使用される記録媒体に
関する。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a recording medium used in an optical information processing device.
この記録媒体は、第１図に示すように、レーザ光を円板
状透明基板１側よりレンズで集光、照射し、記録層２を
局部的に溶融、昇華せしめ、約１μｍの直径を有する小
孔、いわゆる記録ビットを形成し、その記録ビットの有
無による反射率の変化により情報再生を行うものである
。そして、本例では、記録層２を被着させた円板状透明
基板１を２個用意して、記録層２を相互に対向させて、
透明基板１の内周端及び外周端にスペーサ３，４を挿入
して、中空領域５を設け、透明基板１とスペーサ３．４
との間に接着剤６を塗布して貼り合せ構造にしている。As shown in FIG. 1, this recording medium has a diameter of approximately 1 μm by condensing and irradiating laser light with a lens from the disk-shaped transparent substrate 1 side to locally melt and sublimate the recording layer 2. Small holes, so-called recording bits, are formed, and information is reproduced by changing the reflectance depending on the presence or absence of the recording bits. In this example, two disc-shaped transparent substrates 1 each having a recording layer 2 thereon are prepared, and the recording layers 2 are made to face each other.
Spacers 3 and 4 are inserted into the inner and outer edges of the transparent substrate 1 to provide a hollow region 5, and the transparent substrate 1 and the spacers 3 and 4 are
An adhesive 6 is applied between the two to create a bonded structure.
このような構造により、記録層２は外気と遮断密閉され
、湿気などの影響による劣化を防止し、また、外気に露
出された記録層２の記録媒体ど対比して、記録再生を透
明基板１側より行う本例は、記録層２の表面に付＠する
ごみ、ちり及びキズ等の影響を１００万分の１程麿にま
で低減することができ、その結果、記録層２の安定化及
び記録・再生時の誤り率の低減について一応満足してい
る。With such a structure, the recording layer 2 is sealed and sealed from the outside air, preventing deterioration due to the influence of moisture, etc., and recording and reproduction is performed on the transparent substrate 1, compared to the recording medium with the recording layer 2 exposed to the outside air. In this example, performed from the side, the influence of dirt, dust, scratches, etc. on the surface of the recording layer 2 can be reduced to about 1/1,000,000 times, and as a result, the stabilization of the recording layer 2 and the recording・We are satisfied with the reduction in error rate during playback.
しかし、このような光学式、情報記録媒体は、記録感度
、安定性及び信号コントラストについて次のような欠点
があった。寸なわら、記録感瓜については、レーザ光は
記録時において、そのレーザ光量の２０〜３０％が記録
層２を透過し、記録ビット形成のために有効利用されて
いないこと、記録層２の劣化防止手段として保護膜を記
録層２上に被着した場合、記録感度が低下することなど
の欠点があり、安定性については、記録層２の表面は遮
断密閉されているとは言え、中空領域５の下にあること
から、酸化による反射率の低下、膜はがれ及びきれつな
どが起きやすいこと、記録層２は透明基板１に直接被着
しているために、基板表面の数μｍ程度のきず、凹凸な
どの影響を受けやすいことなどの欠点があり、更に、記
録感度及び安定性と信号コントラストとの関係について
は、記録感度を向上させるために記録層２の膜厚を薄く
した場合、（ＲＯ−Ｒ＋ ）／ （ＲＯ＋Ｒ＋ ）（こ
こで、ＲＯ及びＲ１はそれぞれ未記録部分及び記録部分
から得られた反射光信号である。）で表現される信号コ
ントラストが低下し、前述した安定性も著しく劣化する
こと、逆に、信号コントラストを高くし、記録層２の劣
化を防止するために、記録層２の膜厚を厚くした場合、
記録感度が低下するといった相反する性質を持っている
ことがら、両者を共に良好な状態にすることが不可能で
あった。However, such optical information recording media have the following drawbacks regarding recording sensitivity, stability, and signal contrast. However, regarding the recording process, 20 to 30% of the amount of laser light passes through the recording layer 2 during recording, and is not effectively used for forming recording bits. When a protective film is applied to the recording layer 2 as a means to prevent deterioration, there are drawbacks such as a decrease in recording sensitivity, and stability is affected by the fact that although the surface of the recording layer 2 is sealed and sealed, there are Since the recording layer 2 is located under the area 5, it is susceptible to a decrease in reflectance due to oxidation, peeling and cracking of the film, and since the recording layer 2 is directly adhered to the transparent substrate 1, it is a few μm below the substrate surface. It has drawbacks such as being easily affected by scratches, unevenness, etc. Furthermore, regarding the relationship between recording sensitivity and stability and signal contrast, when the film thickness of the recording layer 2 is made thinner in order to improve recording sensitivity, , (RO-R+)/(RO+R+) (where RO and R1 are the reflected light signals obtained from the unrecorded area and the recorded area, respectively) decreases, and the stability described above decreases. Conversely, if the thickness of the recording layer 2 is increased in order to increase the signal contrast and prevent the recording layer 2 from deteriorating,
Since they have contradictory properties such as a decrease in recording sensitivity, it has been impossible to achieve good conditions for both.
本発明は、上記した欠点を除去するためになされたもの
であり、透明基板上に少なくとも光吸収性及び光干渉性
を右する第１層と、レーザ光により情報記録を行う記録
層と、少なくとも光吸収性を有する第２層とを順次被着
することにより、記録感度を向上させ、記録層を安定化
させ、更に信号コントラストを高くさせた光学式情報記
録媒体を提供することを目的とする。The present invention has been made in order to eliminate the above-mentioned drawbacks, and includes at least a first layer having light absorption and light interference properties, a recording layer for recording information using a laser beam, and at least a first layer on a transparent substrate. The object of the present invention is to provide an optical information recording medium that improves recording sensitivity, stabilizes the recording layer, and further increases signal contrast by sequentially depositing a second layer having light absorption properties. .
第２図は、本発明による光学式情報記録媒体の主要部を
示し、同図＜ａ ＞及び（ｂ）はそれぞれレーザ光照射
前及びレーザ光照射後の状態であり、全体構造としては
、同図に示す円板状透明基板１を２個用意して、第１図
に示すように各層を対向さゼて、スペーサを介して接合
した遮断密閉構造になっている。FIG. 2 shows the main parts of the optical information recording medium according to the present invention, and FIG. Two disk-shaped transparent substrates 1 shown in the figure are prepared, and as shown in FIG. 1, each layer is placed facing each other and joined via a spacer to form a shielding and sealing structure.
円板状透明基板１上には、少なくとも光吸収性及び光干
渉性を有する第１層７と、レーザ光により情報記録を行
う記録層８と、少なくとも光吸収性を有づ−る第２層と
を順次被着している。On the disc-shaped transparent substrate 1, there are provided a first layer 7 having at least light absorption and light interference, a recording layer 8 for recording information using laser light, and a second layer having at least light absorption. and are applied sequentially.
先ず、第１層７は光吸収性であることから、レーザ光が
円板状透明基板１側より照射したとき、この第１層７に
て熱を発生し、記録層８にお（）る記録ビット１０の形
成に有効な熱として利用して記録感度を向上させる。ま
た、この第１層７に光干渉性を持たせることにより、第
１層７の内部でレーザ光を伺回か多重反射させ、記録層
８との界面においてその多重反射毎にレーザ光を記録層
８側に誘導させ、記録感度を向上させる。更に、未記録
部分の反射光信号ＲＯが前述した多重反射により増大す
ることから、信号コン１−ラストも高くなる。なお、こ
の第１層７に断熱性ないし比較的厚り膜厚を持たぜた場
合には、レーザ光照射による記録層８で発生した熱の伝
導がこの第１ｍ７にて阻止され、透明基板１側への熱伝
導を防止し、前述した光吸収による第１層７内部で発生
した熱の伝導が記録層８側に一層誘導され、更に、透明
基板１の凹凸などの表面欠陥があったどしても、その影
響を第１層７にて緩和して、記録層８への影響を少なく
づ−る。First, since the first layer 7 is light-absorbing, when a laser beam is irradiated from the disk-shaped transparent substrate 1 side, heat is generated in the first layer 7 and transferred to the recording layer 8 ( ). The recording sensitivity is improved by using the heat as effective heat for forming recording bits 10. In addition, by giving the first layer 7 optical coherency, the laser beam is circulated or reflected multiple times inside the first layer 7, and the laser beam is recorded at each multiple reflection at the interface with the recording layer 8. It is guided to the layer 8 side to improve recording sensitivity. Furthermore, since the reflected optical signal RO in the unrecorded portion increases due to the multiple reflection described above, the signal contrast also increases. Note that when this first layer 7 has heat insulating properties or a relatively thick film thickness, conduction of heat generated in the recording layer 8 due to laser beam irradiation is blocked by the first layer 7, and the transparent substrate 1 The conduction of heat generated inside the first layer 7 due to the aforementioned light absorption is further guided to the recording layer 8 side, and furthermore, even if there are surface defects such as irregularities on the transparent substrate 1, Even if the recording layer 8 is recorded, the influence on the recording layer 8 is reduced by mitigating the influence in the first layer 7.
次に、第２層９は光吸収性であることから、レーザ光照
射時に熱を発生し、記録層８の記録ビット１０の形成に
対しで有効な熱として利用されると共に、この第２層９
を軟化させることから、記録層８に記録ビット１０を形
成゛りる際に、この第２層９が容易に取り除かれ、硬化
状態のままであったときと対比しで、記録層８の記録ビ
ット１０の形成を促進し、結局、記録感度が向上する。Next, since the second layer 9 is light-absorbing, it generates heat when irradiated with laser light and is used as effective heat for forming the recording bits 10 of the recording layer 8. 9
Therefore, when forming the recording bits 10 on the recording layer 8, this second layer 9 is easily removed, and the recording layer 8 becomes softer, compared to when the second layer 9 remains in a hardened state. This promotes the formation of bits 10 and ultimately improves recording sensitivity.
また、この第２層９は記録層８の表面を覆うことから、
保護膜としても作用Ｊる。以下、本発明の具体的実施例
を説明する。Furthermore, since this second layer 9 covers the surface of the recording layer 8,
It also acts as a protective film. Hereinafter, specific examples of the present invention will be described.
円板状透明基板１として超精密加工、朝磨、洗浄の各工
程を経た板厚１．２ｍｍのソーダライムガラスを使用し
た。As the disc-shaped transparent substrate 1, soda lime glass with a thickness of 1.2 mm was used, which had undergone ultra-precision processing, polishing, and cleaning steps.
第１層７は、１３．５４ Ｍ＋−１２、１００Ｗの高周
波電力でエチレンガスを１〜１０”” Ｔ ｏｒｒのガ
ス圧でグロー放電させ、同時に波長８３０ ｎｒｎの半
導体レーザに吸収性を持つ材料として銅フタロシアニン
を蒸着してソーダライムガラス［に被着した。エチレン
重合膜中の銅フタロシアニンの含有量は１５ａｔｏｍｉ
ｃ％稈痕である。この含有量は５〜４０ａｔｏｍｉｃ％
の範囲にあればよく、好ましくは１０〜２０ａｔｏｍｉ
ｃ％である。この第１層７の膜厚は、光干渉性により反
射率が最大になり、また断熱効果が得られるように設定
され、本例では約２０００人であり、その範囲は１００
０人〜３０００人であればＪ：いが、好ましくは１５０
０人〜２５００人である。ソーダライムガラス基板上に
この第１層７のみを被着させて、同基板側からめた反射
率は約１０％であった。The first layer 7 is made of a material that glow discharges ethylene gas at a gas pressure of 1 to 10" Torr with a high frequency power of 13.54 M+-12 and 100 W, and at the same time absorbs a semiconductor laser having a wavelength of 830 nrn. Copper phthalocyanine was deposited on soda lime glass. The content of copper phthalocyanine in the ethylene polymer film is 15 atoms.
c% culm scar. This content is 5-40 atomic%
It may be within the range of, preferably 10 to 20 atoms
c%. The film thickness of the first layer 7 is set so that the reflectance is maximized due to optical interference and a heat insulation effect is obtained.
J: Yes if there are 0 to 3000 people, but preferably 150
0 to 2500 people. Only this first layer 7 was deposited on a soda lime glass substrate, and the reflectance from the substrate side was about 10%.
次に、９９．９９％の純度のテルルを１ ｘ １０””
’Ｔ ｏｒ「の真空度で真空蒸着により膜厚１００人の
記録層８を先の第１層７上に被着した。この記録層８の
膜厚は２０人〜５００Ａの範囲にあればよく、好ましく
は５０人〜１５０人である。Next, 1 x 10” of 99.99% pure tellurium
A recording layer 8 having a thickness of 100 Å was deposited on the first layer 7 by vacuum evaporation at a vacuum degree of 'T or'. , preferably 50 to 150 people.
次に、第２層９はエチレンガスを第１層１と同様な方法
及び条件によりグロー放電させ、同時にテルルを蒸着し
て記録層８上に被着した。本例のエチレン重合膜中のテ
ルルの含有量は約１０ａｔｏｍｉｃ％であるが、その範
囲は５〜４０ａｔｏｍｉｃ％であればよく、好ましく１
よ１０〜２０ａｔｏｍｉｃ％である。また、エチレン重
合膜の膜厚は、記録感度を低下させずに、記録層８の保
護効果を秦するために、本例では約１ｏｏｏ人に設定し
たが、その範囲は３００人〜３０００人であればよく、
好ましくは５００人〜２５００人である。Next, the second layer 9 was formed by glow-discharging ethylene gas using the same method and conditions as the first layer 1, and at the same time, tellurium was deposited on the recording layer 8 by vapor deposition. The tellurium content in the ethylene polymer film of this example is about 10 atomic%, but it may range from 5 to 40 atomic%, preferably 1
It is 10 to 20 atomic%. In addition, the film thickness of the ethylene polymer film was set to about 100 people in this example in order to reduce the protective effect of the recording layer 8 without reducing the recording sensitivity, but the range is 300 to 3000 people. Good to have,
Preferably it is 500 to 2,500 people.
記録及び再生＋１ａのレーザ照射パワーは、記録媒体面
でそれぞれ６ｍＷ及び０．６ｍ Ｗであった。レーザス
ポットの直径は約１．６μｍであった。記録感度はレー
ザパルス幅で３０ｎｓと高い値が得られた。The laser irradiation powers for recording and reproduction +1a were 6 mW and 0.6 mW, respectively, on the recording medium surface. The diameter of the laser spot was approximately 1.6 μm. A high recording sensitivity of 30 ns in laser pulse width was obtained.
未記録部及び記録部の反射率は、それぞれ３９％及び６
％となって、７３％という高い信号コントラストを得た
。記録部分の反射率が１０％以下になったのは、第２図
（ｂ）に示すように第１層７中の銅フタロシアニンの一
部においても昇華が行われたためと思われる。The reflectance of the unrecorded area and the recorded area is 39% and 6, respectively.
%, and a high signal contrast of 73% was obtained. The reason why the reflectance of the recorded portion was 10% or less is considered to be because some of the copper phthalocyanine in the first layer 7 was also sublimated, as shown in FIG. 2(b).
次に、比較例どして第１図に示したような構造、すなわ
ちソーダライムガラス基板（板厚： １，２ｍｍ）上に
１ｘ １０−６７ ｏｒｒの真空度で純度９９．９９％
のテルルを膜厚約１００人で真空蒸着法により被着し、
ソーダライムガラス基板側よりレーザ光をこの記録媒体
に照射し、記録感度及び信号コントラストをそれぞれ測
定した。なお、レーザ光照射パワーは前述しと同様の条
件とした。測定結果によれば、未記録部分及び記録部分
の反射率はそれぞれ３０％及び５％であり、信号コント
ラストが１０％程度、記録感度がレーザパルス幅で１０
Ｄ ｏ ｓを得て、いずれも本発明と対比して特性が
低下していた。Next, as a comparative example, the structure shown in Fig. 1 was prepared, that is, the purity was 99.99% on a soda lime glass substrate (thickness: 1.2 mm) at a vacuum level of 1 x 10-67 orr.
of tellurium was deposited by vacuum evaporation method to a film thickness of about 100 mm,
A laser beam was irradiated onto this recording medium from the side of the soda lime glass substrate, and the recording sensitivity and signal contrast were measured. Note that the laser beam irradiation power was set to the same conditions as described above. According to the measurement results, the reflectance of the unrecorded part and the recorded part is 30% and 5%, respectively, the signal contrast is about 10%, and the recording sensitivity is about 10% in laser pulse width.
D o s were obtained, and the characteristics were all lower than those of the present invention.
本発明は以上の実施例に挙げた物質に限定されず、透明
基板として、石英ガラス、塩化ビニール樹脂、酢酸ビニ
ール樹脂、アクリル樹脂、メタクリル樹脂、ポリエステ
ル樹脂、ニトロセルロース、ポリスチレン樹脂、ポリプ
ロピレン樹脂、ポリアミド樹脂、ポリカーボネート樹脂
、エポキシ樹脂等を用いてもよい。次に、光吸収性及び
光干渉性を有する第１層７として、鉛フタロシアニンな
どの金属フタロシアニン、テルル（ＴＯ）、セレン（Ｓ
ｅ）、及びイオウ（Ｓ）のカルコゲン元素又はビスマス
（Ｂｉ）、インジウム（Ｉｎ＞、鉛（Ｐｂ）、、カドミ
ウム（Ｃｄ）、ヒ素（Ａｓ ）、スズ（Ｓｎ）の単体及
びその化合物又はで−の酸化物をエチレン市合体以外の
オレフィン化合物に混合させるか、ベンピン類、ポリ１
スプル、ポリスチレン、アクリル系ポリマ、酢酸セルロ
ース、硝酸セルロース、臭素化ポリヒト日キシスチレン
、塩化ゴム、Ｓｉ Ｏ及び５ｉ０２などを用いてもよい
。次に、記Ｂ層８として、カドミウム（Ｃｄ）、ビスマ
ス（Ｂｉ）、インジウム（Ｉｎ）、鉛（ｐＨ）、イＡつ
（Ｓ）、スズ（Ｓｎ）、けレン（Ｓｅ）の単体、それら
の化合物、それらの酸化物又はフタロシアニン誘導体な
どを用いてもＪ、い。光吸収性を有づ゛る第２層つとし
ても第１層７と同様なものが利用でき、更に金（ＡＵ
） 、銀（Ａ（１＞、白金（’Ｐｔ）、銅（Ｃｕ ）及
びクロム（ＣＩ−）などを用いることができる。また、
実施例の成膜方法として真空蒸着及びグロー放電を挙げ
たが、使用覆る物質によって直流スパッタリング、高周
波スパッタリング、反応性スパッタリング、イオンブレ
ーティング、イオンクラスター、メッキ、ＣｖＯ１共蒸
着、気相成長、キャスト、ドクターブレード、マグネト
［１ンスパツタ又はスプレー、ローラーコーティング、
ディッピング。スピニング等の塗布法を用いτもＪ、い
。The present invention is not limited to the materials listed in the above embodiments, but materials such as quartz glass, vinyl chloride resin, vinyl acetate resin, acrylic resin, methacrylic resin, polyester resin, nitrocellulose, polystyrene resin, polypropylene resin, polyamide can be used as the transparent substrate. Resin, polycarbonate resin, epoxy resin, etc. may also be used. Next, as the first layer 7 having light absorption and light interference properties, a metal phthalocyanine such as lead phthalocyanine, tellurium (TO), selenium (S
e), and chalcogen elements of sulfur (S), or simple substances and compounds of bismuth (Bi), indium (In), lead (Pb), cadmium (Cd), arsenic (As), and tin (Sn), or - oxides are mixed with olefin compounds other than ethylene, bempines, poly-1
Sprue, polystyrene, acrylic polymers, cellulose acetate, cellulose nitrate, brominated polyoxystyrene, chlorinated rubber, SiO and 5i02 may also be used. Next, as the B layer 8, simple substances of cadmium (Cd), bismuth (Bi), indium (In), lead (pH), S, tin (Sn), and silicon (Se), It is also possible to use compounds, their oxides, or phthalocyanine derivatives. The second layer having light absorption properties can be made of the same material as the first layer 7, and may also be made of gold (AU
), silver (A(1>), platinum ('Pt), copper (Cu), chromium (CI-), etc. can be used.
Although vacuum evaporation and glow discharge were mentioned as film forming methods in the examples, direct current sputtering, high frequency sputtering, reactive sputtering, ion blating, ion cluster, plating, CvO co-evaporation, vapor phase growth, casting, Doctor blade, magneto [1 inch spatter or spray, roller coating,
Dipping. τ is also J, using a coating method such as spinning.
また、実施例ではレーザ光源に８．３０ ｎ ｍの波長
の半導体レーザを用いたが、使用波長は８３０ ｎ ｍ
以外のものでもより、（の際、各層の膜厚、光吸収ｆ１
物質の配合割合はその波長により機能的に定めることが
できる。In addition, in the example, a semiconductor laser with a wavelength of 8.30 nm was used as a laser light source, but the wavelength used was 830 nm.
(In this case, the film thickness of each layer, light absorption f1
The blending ratio of substances can be determined functionally depending on the wavelength.
以上のとＪ３す、本発明によれば、記録層８の長期安定
化が得られると共に、第１層７と第２層８によるサンド
インチｆｉｌ造により信舅コン１−ラストを高くした状
態で、記録感度を向上させることができる。As described above, according to the present invention, long-term stability of the recording layer 8 can be obtained, and the sand-inch film structure of the first layer 7 and the second layer 8 can increase the optical strength. , recording sensitivity can be improved.
第１図は従来の光学式情報記録媒体の断面図、第２図は
本発明による光学式情報記録媒体の主要部分断面図であ
る。
１・・・円板状透明基板、７・・・第１層、８・・・記
録層、９・・・第２層FIG. 1 is a sectional view of a conventional optical information recording medium, and FIG. 2 is a sectional view of main parts of an optical information recording medium according to the present invention. DESCRIPTION OF SYMBOLS 1... Disc-shaped transparent substrate, 7... First layer, 8... Recording layer, 9... Second layer
Claims (2)
を有する第１層と、レーザ光により情報記録を行う記録
層と、少なくとも光吸収性を有する第２層とを順次被着
することを特徴とする光学式％式％(1) A first layer having at least light absorption and light interference, a recording layer for recording information using a laser beam, and a second layer having at least light absorption are sequentially deposited on a transparent substrate. Features Optical % formula %
）ｔｔ ｍｌ ’７’ ＞ 元素又ハＢｉ 、［、Ｐｂ
、 ｃｄ 、 Ａｓ、Ｓｎのうち少なくとも１つを含
有していることを特徴とする特許請求の範囲第１項記載
の光学式情報記録媒体。(2) The first and second layers are metal phthalocyanine, 7J
)tt ml '7'> Element Mata Bi, [, Pb
, CD, As, and Sn.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58112250A JPS605438A (en) | 1983-06-22 | 1983-06-22 | Optical information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58112250A JPS605438A (en) | 1983-06-22 | 1983-06-22 | Optical information recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS605438A true JPS605438A (en) | 1985-01-12 |
| JPH0330216B2 JPH0330216B2 (en) | 1991-04-26 |
Family
ID=14582000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58112250A Granted JPS605438A (en) | 1983-06-22 | 1983-06-22 | Optical information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS605438A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6163940A (en) * | 1984-09-05 | 1986-04-02 | Hitachi Ltd | Information recording medium |
| JP2004504633A (en) * | 2000-07-17 | 2004-02-12 | チャップマン テクノロジーズ インコーポレイテッド | Dry multilayer inorganic alloy thermal resist for lithographic processing and imaging |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8972409B2 (en) | 2011-07-27 | 2015-03-03 | Google Inc. | Enabling search for conversations with two messages each having a query team |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5174632A (en) * | 1974-12-24 | 1976-06-28 | Canon Kk |
-
1983
- 1983-06-22 JP JP58112250A patent/JPS605438A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5174632A (en) * | 1974-12-24 | 1976-06-28 | Canon Kk |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6163940A (en) * | 1984-09-05 | 1986-04-02 | Hitachi Ltd | Information recording medium |
| JPH0473226B2 (en) * | 1984-09-05 | 1992-11-20 | Hitachi Ltd | |
| JP2004504633A (en) * | 2000-07-17 | 2004-02-12 | チャップマン テクノロジーズ インコーポレイテッド | Dry multilayer inorganic alloy thermal resist for lithographic processing and imaging |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0330216B2 (en) | 1991-04-26 |
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