JPS59215038A - Optical information recording medium - Google Patents
Optical information recording mediumInfo
- Publication number
- JPS59215038A JPS59215038A JP58088620A JP8862083A JPS59215038A JP S59215038 A JPS59215038 A JP S59215038A JP 58088620 A JP58088620 A JP 58088620A JP 8862083 A JP8862083 A JP 8862083A JP S59215038 A JPS59215038 A JP S59215038A
- Authority
- JP
- Japan
- Prior art keywords
- recording
- layers
- substrates
- space
- optical information
- 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
Landscapes
- Thermal Transfer Or Thermal Recording In General (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
【発明の詳細な説明】 本発明は、光学式情報記録媒体の改良に関する。[Detailed description of the invention] The present invention relates to improvements in optical information recording media.
従来、この光学式情報記録媒体は、第１図に示すように
２枚の透明基板１．２と、その透明基板１．２に互に対
面する向きに薄膜形成した記録層３．４から基本的に構
成され、例えば透明基板１側からレーザ光５をレンズ６
で集光して記録層３に照射することにより、記録層３に
約１μｍの直径の小孔を開けて成る記録ビット７を形成
して情報の記録を行い、その記録ビット７の有無による
反ｑ１率の変化を検出して情報の再生を行っている。Conventionally, this optical information recording medium basically consists of two transparent substrates 1.2 and a recording layer 3.4 formed as a thin film facing each other on the transparent substrates 1.2, as shown in FIG. For example, the laser beam 5 is transmitted from the transparent substrate 1 side to the lens 6.
By condensing the light and irradiating it onto the recording layer 3, a recording bit 7, which is a small hole with a diameter of about 1 μm, is formed in the recording layer 3 and information is recorded. Information is reproduced by detecting changes in the q1 rate.
しかしながら、従来の光学式情報記録媒体は、対面する
記録層３，４の相互間隔ρについて充分に考察されてい
なかったために、特に再生時においで信号コントラスト
を低下させる欠点があった。However, in the conventional optical information recording medium, the mutual distance ρ between the facing recording layers 3 and 4 was not sufficiently considered, and therefore, there was a drawback that the signal contrast was reduced, especially during reproduction.
また、この記録層３．４の相互間隔ρを５０μｍ以上に
選定すべきであるとの提案がされているが、この提案に
よれば、レーザ光５が記録ビット７を通過して、他方の
記録層４に照射する際には、そのレーザ光５の径が拡大
していることから、その記録層４における反射光が散乱
して、記録ビット７への戻り光の光量が減少し、記録時
の感磨及び再生時の信号コントラストが充分に満足しな
い欠点があった。Furthermore, it has been proposed that the mutual spacing ρ between the recording layers 3.4 should be selected to be 50 μm or more, but according to this proposal, the laser beam 5 passes through the recording bit 7 and the other When irradiating the recording layer 4, since the diameter of the laser beam 5 is expanded, the reflected light on the recording layer 4 is scattered, and the amount of light returning to the recording bit 7 is reduced, causing the recording There was a drawback that the sensitivity of time and the signal contrast during reproduction were not fully satisfactory.
そして、この光学式情報記録媒体は、記録層３゜４にお
ける外気、特に湿気による劣化を防止Ｊ−るため、第２
図（ａ ）及び（ｂ）に示すように２枚の円板状透明基
板１．２の内円周領域と外円周領域に、スペーサ材とし
て内円周板８ど外円周板９を挿入して、これらの上下面
と２枚の円板状透明基板１．２との間に接着剤１０，１
１，１２．１３を介在ししかしながら、従来の光学式情
報記録媒体は、接着剤１０〜１３の厚さを均一にするこ
とが困難であることから、透明基板１，２の平行度の低
下を余儀なくされたり、スペーサ材としての内円周板８
と外円周板９の厚さを０．５ｍｍ以下に薄クシたい場合
に、その取り扱いが困難になり、作業性が低下する欠点
があった。This optical information recording medium has a second
As shown in Figures (a) and (b), an inner circumferential plate 8 and an outer circumferential plate 9 are placed as spacer materials on the inner circumferential area and outer circumferential area of the two disc-shaped transparent substrates 1.2. Insert the adhesive 10, 1 between these upper and lower surfaces and the two disc-shaped transparent substrates 1.2.
However, in conventional optical information recording media, it is difficult to make the thickness of the adhesives 10 to 13 uniform, so it is difficult to reduce the parallelism of the transparent substrates 1 and 2. Inner circumferential plate 8 as a spacer material
When it is desired to reduce the thickness of the outer circumferential plate 9 to 0.5 mm or less, it becomes difficult to handle and the workability is reduced.
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、対面する記録層の相互間隔Ｑを、ρ−ｍλ／４
ｎ （ｍ ：正の奇数、λ−レーザ光の波長、ｎ：相
Ｕ間隔内の物質の屈折率）に選定し、かつ実質的に等し
い粒径を有する複数の球状体を分散させた接＠層が記録
層以外の２枚の透明基板の対面領域トに介在することに
より、記録時の感度を向上させ、再生時の信号］ンｌ〜
ラストを高くさせ、かつ透明基板の平行度及び接着の作
業性を向上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 was made in order to eliminate the above-mentioned drawbacks, and the mutual distance Q between the facing recording layers is set to ρ-mλ/4.
n (m: positive odd number, λ - wavelength of the laser beam, n: refractive index of the substance within the phase U interval), and a plurality of spherical bodies having substantially the same particle size are dispersed. By interposing the layer in the facing area of the two transparent substrates other than the recording layer, the sensitivity during recording is improved and the signal during reproduction is improved.
An object of the present invention is to provide an optical information recording medium that has a high last, and has improved parallelism of a transparent substrate and workability of adhesion.
本発明は、第３図に示すように灼面記録層３゜４の相互
間隔ρについて、ρ−ｍλ／ ４ ｎに選定し、更にＱ
〈５０μｍ （Ｊ−り好ましくはρ＜１０μｍ）にし
ている。その結果、集光したレーザ光１４（光量：１０
０％）による記録ビット７を形成するための有効光量は
、透明基板１を透過した後の記録層３にお拳プる吸収光
量（同：約２０〜３０％）の他に、その記録層３を透過
後に対面記録層４における反射光量の数１０％相当分（
同：約５〜１０％）が加締され、この加算分は相互間隔
ｇが短くなるに従って増大するから、記録時の感度を向
上させることができる。In the present invention, as shown in FIG.
<50 μm (J-preferably ρ<10 μm). As a result, the focused laser beam 14 (light amount: 10
0%) to form the recording bit 7 is the amount of light absorbed by the recording layer 3 after passing through the transparent substrate 1 (approximately 20 to 30%), as well as the amount of light absorbed by the recording layer 3 After passing through 3, an amount equivalent to several 10% of the amount of reflected light on the facing recording layer 4 (
(approximately 5 to 10%), and this additional amount increases as the mutual distance g becomes shorter, so that the sensitivity during recording can be improved.
また、特に再生時において、未記録部分では記録層３に
おける反射光１５と対面記録層４における反射光１６ど
が、イれぞれの光路差が記録層３において位相をｍλ／
４ｎだけずらしていることから、百に相殺され、全体と
して検出される反射光（１５゜１６）の光量が少なくな
る。一方、記録ビット７の形成部分では、ρ〈５０μｍ
にしている場合には、レーザ光５が透明基板１と記録ビ
ット７を透過した後、対面記録層４における反射光量の
数１０％相当分の反射光１７が再度記録ビット７を透過
して検出され、その検出光量は相互間隔ρが短くなるに
従って増大する。したがって、本発明によれば、未記録
部分と記録ビット形成部分との反１１光量の相互差を増
大させることから、再生時の信号コン：・ラスＩ〜を一
層高くすることができる。In addition, especially during reproduction, in the unrecorded portion, the optical path difference between the reflected light 15 on the recording layer 3 and the reflected light 16 on the facing recording layer 4 changes the phase in the recording layer 3 by mλ/
Since they are shifted by 4n, they are canceled out by 100, and the amount of reflected light (15°16) that is detected as a whole decreases. On the other hand, in the area where recording bit 7 is formed, ρ<50μm
In this case, after the laser beam 5 passes through the transparent substrate 1 and the recording bit 7, reflected light 17 equivalent to several 10% of the amount of reflected light on the facing recording layer 4 passes through the recording bit 7 again and is detected. The amount of detected light increases as the mutual distance ρ becomes shorter. Therefore, according to the present invention, since the mutual difference in light intensity between the unrecorded portion and the recorded bit forming portion is increased, the signal contrast during reproduction can be further increased.
第４図（ａ ）及び（ｂ）は、本発明の具体的実施例を
示す。なお外観は第２図（ａ ）の斜視図と同様である
。FIGS. 4(a) and 4(b) show a specific embodiment of the present invention. Note that the external appearance is the same as the perspective view of FIG. 2(a).
２枚の透明基板１Ｂ、１９は、超精密研磨加工した直径
３ＱＯｕ＋ｍ 、厚さ１．２ＬＩＩＬＩｌのソーダライ
ムガラスか５−
らなる円板であり、その中心付近に直径３５ｍｍの回転
用の穴２０．２１を開けた。この透明基板１８．１９の
中間円周領域上には真空度１，５Ｘ ｉｏ−’１− ｏ
ｒｒで純度９９．９９％のテルルを真空蒸着したテルル
躾（膜２２３
厚：約１００人）からなる記録層料、質を付着させた。The two transparent substrates 1B and 19 are discs made of ultra-precision polished soda lime glass with a diameter of 3QOu+m and a thickness of 1.2LIIL, and have a rotation hole 20. with a diameter of 35mm near the center thereof. I opened 21. A vacuum level of 1.5X io-'1-o is placed on the intermediate circumferential region of the transparent substrate 18.
A recording layer material made of tellurium (film 223 thickness: about 100 layers) obtained by vacuum-depositing tellurium with a purity of 99.99% using RR was deposited.
そして、対面する記録層２２．２３の相互間隔Ｑ（よ、
Ｑ＝ｍλ／４ｎの式におイテ、ｍ＝３、ｎ＝１（空気の
屈折率）及びλ−８３０ｎｍ （半導体レーザ光の波
長）である場合の理論値Ｑ＝６２２５人に近い値として
Ｑ ＝ ０．６２±０．０２μｍの粒径を有するポリエ
チレン・ラテックスビーズ（Ｑ ｕｋｅ Ｓ ０ｉｅ
ｎｔｉｆｉｃ Ｑ ｏｒｐ製）を球状体２４．２５と
して多数用意し、接着剤には、エポキシ系接着剤（セメ
ダイン（株）製、１５６５）を用い、先の球状体２４．
２５と接着剤との各体積比をそれぞれ１：３程度の割合
で混合したものを、記録層２２．２３を中心にして２枚
の透明基板１８．１９の内円周領域と外円周領域上に塗
布して、２枚の透明基板１８．１９を貼り合わせること
により、球状体２４．２５が分散された接着６一
層２６．２７を形成して、前述した相互間隔Ｑ （正ｆ
１ｆには＋−Ｑ −２Ｘ １００人」）を確保した。な
お、この接着層２ ［３、２７の領域幅は約２ｍｍであ
った。Then, the mutual distance Q (yo,
Based on the formula Q = mλ/4n, the theoretical value when m = 3, n = 1 (refractive index of air) and λ - 830 nm (wavelength of semiconductor laser light) Q = 6225 As a value close to human, Q = Polyethylene latex beads with a particle size of 0.62 ± 0.02 μm (QukeS0ie
A large number of spherical bodies 24.25 (manufactured by Cemedine Co., Ltd.) were prepared as spherical bodies 24.25, and an epoxy adhesive (manufactured by Cemedine Co., Ltd., 1565) was used as the adhesive.
A mixture of 25 and adhesive at a volume ratio of about 1:3 is applied to the inner and outer circumferential areas of two transparent substrates 18 and 19, with the recording layer 22 and 23 at the center. By bonding two transparent substrates 18.19 together, a layer 26.27 of adhesive 6 in which spherical bodies 24.25 are dispersed is formed, and the above-mentioned mutual distance Q (positive f
1F (+-Q-2X 100 people) was secured. Note that the area width of this adhesive layer 2 [3, 27 was approximately 2 mm.
かくして得られた相互間隔ρは、球状体２４ 、２５０
粒径精度で決定され、本例では１／１００の粒径精度に
より、理論値との誤差を＋３％以内に抑えることができ
た。The mutual spacing ρ thus obtained is spherical bodies 24, 250
It is determined based on particle size accuracy, and in this example, the particle size accuracy of 1/100 made it possible to suppress the error from the theoretical value to within +3%.
次に、半導体レーザ光の記録層２２．２３上でのビーム
径を約１．８μｍ１パワーを６ｍＷにして、透明基板１
８．１９側から記録層２２．２３に記録ビットを形成し
た。Next, the beam diameter of the semiconductor laser beam on the recording layer 22, 23 was set to about 1.8 μm, the power was set to 6 mW, and the transparent substrate 1
Recording bits were formed on recording layers 22 and 23 from the 8.19 side.
その結果、透明基板１８．１９側から測定した未記録部
分の記録＠ ２２．２３の反射率は相殺作用により約１
０％まで減少し、記録ビット形成箇所の反射率は検出光
量の増大作用により５０％程度まで増大した。従来のよ
うな対面記録層の相互間隔を５０１１Ｉｌｌ以−にに選
定したものと比較して、記録時の感度は約１．２〜１．
５倍増大したことが確認された。また、再生時の信号コ
ントラス１−も従来品と比較して約１．７倍も高くなっ
た。As a result, the reflectance of the unrecorded portion recorded @ 22.23 measured from the transparent substrate 18.19 side was approximately 1 due to the cancellation effect.
The reflectance at the recording bit formation location increased to about 50% due to the effect of increasing the amount of detected light. Compared to the conventional arrangement in which the mutual spacing between the facing recording layers is set to 5011 Ill or more, the sensitivity during recording is about 1.2 to 1.
It was confirmed that the size increased five times. Furthermore, the signal contrast 1- during reproduction was approximately 1.7 times higher than that of the conventional product.
また、従来のスペーサ材として通常ＰＭＭＡ樹脂が用い
られ、このＰＭＭＡ樹脂は吸水率が高いために、記録層
の劣化をはやめていたが、本発明では、上記スペーサ材
の代りに球状体含有の接着層を使用していることから、
吸水率を従来品と比較して１／２〜１／３に抑えること
でき、記録層の長期安定性を大幅に向上させることがで
きる。In addition, PMMA resin is usually used as a conventional spacer material, and this PMMA resin has a high water absorption rate, so it prevents the recording layer from deteriorating, but in the present invention, instead of the spacer material, an adhesive containing spherical bodies Because it uses layers,
The water absorption rate can be suppressed to 1/2 to 1/3 compared to conventional products, and the long-term stability of the recording layer can be significantly improved.
更にまた、本発明によれば、相互間隔ρを５０μｍ以下
にしても、接着工程が前述した通り極めて簡単であるこ
とから、従来品と比較して製造を容易にし、かつそのコ
ストを低減することができる。Furthermore, according to the present invention, even if the mutual spacing ρ is 50 μm or less, the bonding process is extremely simple as described above, making manufacturing easier and reducing costs compared to conventional products. I can do it.
そして、接着層２６．２７の接着強度については、透明
基板１８，１９と球状体２４．２５の接している近傍に
おいて、０〜数μｍのような極めて薄い接着層が形成さ
れることから、接着剤の硬化に伴う体積変化が小さくな
って、接着層の歪量が少なくなり、接着強度が従来の平
面状接着層よりも大幅に向上させることができる。Regarding the adhesive strength of the adhesive layer 26.27, an extremely thin adhesive layer of 0 to several μm is formed in the vicinity where the transparent substrates 18, 19 and the spherical bodies 24.25 are in contact. The volume change accompanying curing of the agent is reduced, the amount of distortion in the adhesive layer is reduced, and the adhesive strength can be significantly improved compared to conventional planar adhesive layers.
本考案は以上の実施例に挙げた物質に限定されず、透明
基板としては石英ガラス等の他のガラスや、アクリル、
ボリノＪ−ボネート、エポキシ、ポリ塩化ビニール、ポ
リスチレン等の各種樹脂であってもよく、記録層として
はＢｉ 、Ｉｎ、Ｓｎ。The present invention is not limited to the materials listed in the above embodiments, and the transparent substrate may include other glasses such as quartz glass, acrylic,
Various resins such as borino J-bonate, epoxy, polyvinyl chloride, and polystyrene may be used, and the recording layer may be Bi, In, or Sn.
Ｓｂ 、Ｃ８２−Ｔｅ 、Ｓｔ −Ｔｅ 、Ｃ８２−Ｂ
ｉ 。Sb, C82-Te, St-Te, C82-B
i.
Ｓｔ −Ｂｉ 、 Ｔｅ Ｏｘ 、 ＶＯ２、Ａｓ −
１−ｅ 。St-Bi, TeOx, VO2, As-
1-e.
Ｇｅ −Ｔｅ 、 Ｂｉ −１−ｅ 、△Ｓ −３ｅ
、 Ｇｅ −８ｅ 、５ｂ−８，Ｔｅ−Ｃ，非晶質Ｑ
ｅ、非結晶Ｓｉ、スヂレンオリゴマ＝Ａ７５＋オレオゾ
ールフン・ストブルーＦ１−１その他面様な機能を有す
る有；幾物質もしくは無機物質、又はそれらの混合物で
もよく、球状体としては、ガラス、ニラウール、ステン
レス、アクリル、ナイロン、セラミック、カーボン、カ
ーボンマイクロバルーン等の物質でもよく、接着剤とし
ては、シアノアクリレート系接着剤９１０（エマーソン
アンド力ミングジャパン（株））、チキン性接着剤（常
温硬化の２液性工ポキシ系接着剤）−５３０（アミコン
（株））、フレキシブルタイプＵｖ硬化型樹脂ＣＶ ７
００５ （松下電工（株））等でもよい。Ge-Te, Bi-1-e, △S-3e
, Ge-8e, 5b-8, Te-C, amorphous Q
e, amorphous Si, styrene oligomer = A75 + oleosol fluoride, blue F1-1, etc.; It may be an amorphous substance or an inorganic substance, or a mixture thereof; examples of spherical bodies include glass, chive wool, and stainless steel. , acrylic, nylon, ceramic, carbon, carbon microballoon, etc. As the adhesive, cyanoacrylate adhesive 910 (Emerson & Rikiming Japan Co., Ltd.), chicken adhesive (two-component adhesive that cures at room temperature) Flexible poxy adhesive)-530 (Amicon Co., Ltd.), flexible type UV curable resin CV 7
005 (Matsushita Electric Works Co., Ltd.) or the like.
記録層の成膜は、真空蒸着以外に、反応性スパー９＝
ツタリング、イオンブレーティング、マグネトロンスパ
ッタリング、高周波スパッタリング、直流スパッタリン
グ、グロー放電、スピンコード等でもよい。レーザ光は
波長８３０ｎｍに限らず、可視光、紫外光及び赤外光の
各領域波長を有するレーザ光でもよい。また相互間隔ρ
−ｍλ／４０のうち、ｍは３に限らず、他の正の奇数で
もよい。ぞの相互間隔内の物質としては空気層以外に接
着剤等の有機物質を充填してもよい。In addition to vacuum deposition, the recording layer may be formed by reactive sparring, ion blating, magnetron sputtering, high frequency sputtering, direct current sputtering, glow discharge, spin code, or the like. The laser light is not limited to a wavelength of 830 nm, and may be a laser light having a wavelength in each of visible light, ultraviolet light, and infrared light. Also, the mutual interval ρ
-mλ/40, m is not limited to 3, and may be any other positive odd number. In addition to the air space, an organic substance such as an adhesive may be filled in the space between each other.
第１図は従来の光学式情報記録媒体とレーザ光の関係を
示す。第２図は従来の光学式情報記録媒体を示し、同図
（ａ ）は外観を示す斜視図、同図（ｂ）は同図（ａ
）のＸ−Ｘ線箇所の断面図である。第３図は本発明によ
る光学式情報記録媒体とレーザ光の関係を示す。第４図
は本発明による光学式情報記録媒体を示し、同図（ａ
）は第２図（ｂ）と同様な断面図、同図（ｂ ）は部分
断面拡大図である。
１０−
１、２． １８．１９・・・透明基板、３．４． ２２
．２３・・・記録層、５，１４・・・レーザ光、６・・
・レンズ、７・・・記録ビット、８・・・内円同根、９
・・・外円周板、１０，１１，１２．１３・・・接着剤
、１５．１６．１７・・・９反射レーザ光、２０．２１
・・・穴、２４．２５・・・球状体、２６．２７・・・
接着層１１−FIG. 1 shows the relationship between a conventional optical information recording medium and a laser beam. Figure 2 shows a conventional optical information recording medium, where (a) is a perspective view showing the external appearance, and (b) is a perspective view of the external appearance.
) is a sectional view taken along line X-X of FIG. FIG. 3 shows the relationship between the optical information recording medium and laser light according to the present invention. FIG. 4 shows an optical information recording medium according to the present invention, and FIG.
) is a sectional view similar to FIG. 2(b), and FIG. 2(b) is an enlarged partial sectional view. 10-1, 2. 18.19...Transparent substrate, 3.4. 22
．． 23... Recording layer, 5, 14... Laser light, 6...
・Lens, 7... Recording bit, 8... Same root of inner circle, 9
...Outer circumferential plate, 10,11,12.13...Adhesive, 15.16.17...9 Reflected laser beam, 20.21
... Hole, 24.25 ... Spherical body, 26.27 ...
Adhesive layer 11-
Claims (2)
行う記録層を設け、前記２枚の透明基板は前記記録層が
対面する向きに配置させた光学式情報記録媒体において
、前記対面する記録層の相互間隔Ｑ ＳＱ ＝ｍλ／４
ｎ （ＩＩＩ ：正ｆ７）奇数、λ：レーザ光の波長
、ｎ：相互間隔内の物質の屈折率）であり、かつ実質的
に等しい粒径を有する複数の球状体を分散させた接着層
が前記記録層以外の前記２枚の透明基板の対面領域上に
介在していることを特徴とする光学式情報記録媒体。(1) In an optical information recording medium, a recording layer for recording information using a laser beam is provided on two transparent substrates, and the two transparent substrates are arranged so that the recording layers face each other. Mutual spacing between recording layers Q SQ = mλ/4
n (III: positive f7) odd number, λ: wavelength of the laser beam, n: refractive index of the substance within the mutual spacing), and an adhesive layer in which a plurality of spherical bodies having substantially the same particle size are dispersed. An optical information recording medium, characterized in that the recording layer is interposed on a facing area of the two transparent substrates other than the recording layer.
あ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 optical information recording medium according to claim 1, wherein the mutual distance Q between the facing recording layers is Q<50 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58088620A JPS59215038A (en) | 1983-05-20 | 1983-05-20 | Optical information recording medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58088620A JPS59215038A (en) | 1983-05-20 | 1983-05-20 | Optical information recording medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59215038A true JPS59215038A (en) | 1984-12-04 |
| JPH0322658B2 JPH0322658B2 (en) | 1991-03-27 |
Family
ID=13947845
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58088620A Granted JPS59215038A (en) | 1983-05-20 | 1983-05-20 | Optical information recording medium |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59215038A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5865530A (en) * | 1981-08-28 | 1983-04-19 | コンネル・リミテッド・パートナーシップ | Power press mechanism and its drive method |
-
1983
- 1983-05-20 JP JP58088620A patent/JPS59215038A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5865530A (en) * | 1981-08-28 | 1983-04-19 | コンネル・リミテッド・パートナーシップ | Power press mechanism and its drive method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0322658B2 (en) | 1991-03-27 |
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