JPH0922242A - Method for controlling diffraction efficiency in hologram recording - Google Patents
Method for controlling diffraction efficiency in hologram recordingInfo
- Publication number
- JPH0922242A JPH0922242A JP17091995A JP17091995A JPH0922242A JP H0922242 A JPH0922242 A JP H0922242A JP 17091995 A JP17091995 A JP 17091995A JP 17091995 A JP17091995 A JP 17091995A JP H0922242 A JPH0922242 A JP H0922242A
- Authority
- JP
- Japan
- Prior art keywords
- hologram recording
- hologram
- layer
- diffraction efficiency
- photopolymer
- 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
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000000178 monomer Substances 0.000 claims abstract description 27
- 238000006116 polymerization reaction Methods 0.000 claims description 9
- 239000003999 initiator Substances 0.000 claims description 5
- 238000010526 radical polymerization reaction Methods 0.000 claims description 5
- 230000005865 ionizing radiation Effects 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 239000010410 layer Substances 0.000 description 69
- 229920002799 BoPET Polymers 0.000 description 5
- 239000004014 plasticizer Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 239000013039 cover film Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- NIQCNGHVCWTJSM-UHFFFAOYSA-N Dimethyl phthalate Chemical compound COC(=O)C1=CC=CC=C1C(=O)OC NIQCNGHVCWTJSM-UHFFFAOYSA-N 0.000 description 2
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- -1 (t-butylperoxy) Carbonyl Chemical group 0.000 description 1
- SANIRTQDABNCHF-UHFFFAOYSA-N 7-(diethylamino)-3-[7-(diethylamino)-2-oxochromene-3-carbonyl]chromen-2-one Chemical compound C1=C(N(CC)CC)C=C2OC(=O)C(C(=O)C3=CC4=CC=C(C=C4OC3=O)N(CC)CC)=CC2=C1 SANIRTQDABNCHF-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- RWCCWEUUXYIKHB-UHFFFAOYSA-N benzophenone Chemical compound C=1C=CC=CC=1C(=O)C1=CC=CC=C1 RWCCWEUUXYIKHB-UHFFFAOYSA-N 0.000 description 1
- 239000012965 benzophenone Substances 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- FBSAITBEAPNWJG-UHFFFAOYSA-N dimethyl phthalate Natural products CC(=O)OC1=CC=CC=C1OC(C)=O FBSAITBEAPNWJG-UHFFFAOYSA-N 0.000 description 1
- 229960001826 dimethylphthalate Drugs 0.000 description 1
- 239000010408 film Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000003359 percent control normalization Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920002689 polyvinyl acetate Polymers 0.000 description 1
- 239000011118 polyvinyl acetate Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Landscapes
- Holo Graphy (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ホログラム記録におけ
る回折効率制御方法に関し、特に、フォトポリマーから
なるホログラム記録層にホログラムを記録する際に、回
折効率を所定の値に制御する方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling diffraction efficiency in hologram recording, and more particularly to a method for controlling diffraction efficiency to a predetermined value when recording a hologram on a hologram recording layer made of a photopolymer.
【０００２】[0002]
【従来の技術】ホログラム光学素子であるヘッドアップ
ディスプレイ用ビームコンバイナー、ホログラム２ビー
ムスプリッター、ホログラム３ビームスプリッター等に
おいては、ホログラムの回折効率を５０％、３３％等の
任意の値に設定する必要がある。従来は、ホログラム記
録の際の露光強度と時間（露光量）によって制御するの
が普通であった。2. Description of the Related Art In a beam combiner for a head-up display, a hologram 2 beam splitter, a hologram 3 beam splitter, etc., which are hologram optical elements, it is necessary to set the diffraction efficiency of the hologram to an arbitrary value such as 50% or 33%. is there. In the past, it was usual to control by the exposure intensity and time (exposure amount) during hologram recording.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、露光強
度と時間によってホログラムの回折効率を制御する方法
によると、実際に得られる回折効率にはばらつきが大き
くなる問題点がある。特に、低い回折効率を正確に得る
ことは大変困難なことであった。However, according to the method of controlling the diffraction efficiency of the hologram depending on the exposure intensity and the time, there is a problem that the actually obtained diffraction efficiency varies greatly. In particular, it has been very difficult to accurately obtain a low diffraction efficiency.
【０００４】本発明はこのような従来技術の問題点に鑑
みてなされたものであり、その目的は、ホログラム記録
層としてフォトポリマーを用いる場合に、極めて簡単な
方法で回折効率を任意の値に正確に設定することができ
る方法を提供することである。The present invention has been made in view of the above problems of the prior art, and an object thereof is to set the diffraction efficiency to an arbitrary value by a very simple method when a photopolymer is used as the hologram recording layer. It is to provide a method that can be set accurately.
【０００５】[0005]
【課題を解決するための手段】上記目的を達成する本発
明のホログラム記録における回折効率制御方法は、フォ
トポリマー中のモノマーの重合度を制御するコントロー
ル層上にフォトポリマーからなるホログラム記録層を積
層し、両層の接触時間を選択し、その時間経過後にホロ
グラム露光を行うことを特徴とする方法である。A method for controlling the diffraction efficiency in hologram recording of the present invention which achieves the above object, comprises a hologram recording layer made of a photopolymer laminated on a control layer for controlling the degree of polymerization of a monomer in the photopolymer. However, the contact time between both layers is selected, and hologram exposure is performed after the time has elapsed.
【０００６】この場合、コントロール層がホログラム記
録層中のモノマーを拡散により受容してホログラム記録
層中のモノマー濃度を下げる媒質、あるいは、ホログラ
ム記録層中へモノマーのラジカル重合を阻害する可塑剤
を拡散する媒質であることが望ましい。In this case, the control layer diffuses a medium that reduces the monomer concentration in the hologram recording layer by receiving the monomer in the hologram recording layer by diffusion, or a plasticizer that inhibits radical polymerization of the monomer into the hologram recording layer. It is desirable that the medium be
【０００７】また、コントロール層が電離放射線開始剤
を含有し、ホログラム露光後に電離放射線照射を行うこ
とが望ましい。Further, it is desirable that the control layer contains an ionizing radiation initiator, and irradiation of the ionizing radiation is carried out after the hologram exposure.
【０００８】なお、コントロール層は、ホログラム記録
層との屈折率差が０．１以下であり、複屈折性のほとん
どないものであることが望ましい。The control layer preferably has a difference in refractive index from the hologram recording layer of 0.1 or less and has almost no birefringence.
【０００９】[0009]
【作用】本発明においては、フォトポリマー中のモノマ
ーの重合度を制御するコントロール層上にフォトポリマ
ーからなるホログラム記録層を積層し、両層の接触時間
を選択し、その時間経過後にホログラム露光を行うの
で、コントロール層へホログラム記録層を接触させてか
らの時間を選択することにより、ホログラム記録層に記
録されたホログラムの回折効率を低い値を含めて任意の
値に正確に設定することができる。In the present invention, the hologram recording layer made of a photopolymer is laminated on the control layer for controlling the degree of polymerization of the monomer in the photopolymer, the contact time between both layers is selected, and hologram exposure is performed after the time has elapsed. Therefore, the diffraction efficiency of the hologram recorded in the hologram recording layer can be accurately set to any value including a low value by selecting the time after the hologram recording layer is brought into contact with the control layer. .
【００１０】[0010]
【実施例】本発明のホログラム記録における回折効率制
御方法の基本原理は、ホログラム露光の前に、フォトポ
リマーからなるホログラム記録層にその中のモノマーの
重合度を制御するコントロール層を所定時間接触させて
フォトポリマー中のモノマーの重合割合を制御して、屈
折率変調を所定の値に制御することにより回折効率を任
意の値に正確に設定することである。EXAMPLES The basic principle of the method for controlling the diffraction efficiency in hologram recording of the present invention is that a hologram recording layer made of a photopolymer is brought into contact with a control layer for controlling the degree of polymerization of a monomer therein for a predetermined time before hologram exposure. By controlling the polymerization ratio of the monomers in the photopolymer to control the refractive index modulation to a predetermined value, the diffraction efficiency can be accurately set to an arbitrary value.
【００１１】この原理を図１の模式図を用いてに説明す
る。まず、図（ａ）に示すように、透明基板１の表面に
本発明によるコントロール層２を塗布する。コントロー
ル層２としては、次に述べるフォトポリマー層中のモノ
マーを拡散により受容してフォトポリマー層中のモノマ
ー濃度を下げる媒質、あるいは、フォトポリマー層中へ
モノマーのラジカル重合を阻害する可塑剤等を拡散する
媒質を用いる。This principle will be described with reference to the schematic diagram of FIG. First, as shown in FIG. 1A, the control layer 2 according to the present invention is applied to the surface of the transparent substrate 1. As the control layer 2, a medium which receives the monomer in the photopolymer layer described below by diffusion and reduces the monomer concentration in the photopolymer layer, or a plasticizer which inhibits radical polymerization of the monomer into the photopolymer layer, etc. Use a diffusing medium.
【００１２】次いで、図（ｂ）に示すように、コントロ
ール層２上へバインダーポリマー、ラジカル重合可能な
モノマー、開始剤及び色素からなるフォトポリマーのホ
ログラム記録層３を貼り合わせ、このホログラム記録層
３上にフォトポリマーの重合を阻害する酸素を遮断する
ためのＰＥＴフィルム等からなるカバーフィルム４を貼
り合わせる。Next, as shown in FIG. 1B, a hologram recording layer 3 of a photopolymer consisting of a binder polymer, a radically polymerizable monomer, an initiator and a dye is bonded onto the control layer 2, and the hologram recording layer 3 is formed. A cover film 4 made of a PET film or the like for blocking oxygen that hinders the polymerization of the photopolymer is attached to the top.
【００１３】フォトポリマー層３中のモノマーがコント
ロール層２へ所定量拡散してフォトポリマー層３中のモ
ノマー濃度が所定の値に下がるようにするか、あるい
は、コントロール層２中の可塑剤が所定量フォトポリマ
ー層３中へ拡散してその中のモノマーのラジカル重合を
所定割合阻害するようにするために、又は、両者を同時
に生起させるために、コントロール層２にホログラム記
録層３を接触させてからの時間を調節して、その時間経
過後に、図（ｃ）に示すように、ホログラム記録層３へ
ホログラム露光する。この時の露光量は、フォトポリマ
ー層３を飽和させるのに充分な露光量とする。図２は、
コントロール層２の上にフォトポリマー層３を貼り付け
てからホログラム露光するまでの時間に依存した回折効
率の変化の１例を示す図であり、コントロール層２へホ
ログラム記録層３を接触させてからの時間を選択するこ
とにより、フォトポリマー層３へ記録されたホログラム
の回折効率を低い値を含めて任意の値に正確に設定でき
ることが分かる。Either a predetermined amount of the monomer in the photopolymer layer 3 is diffused into the control layer 2 so that the concentration of the monomer in the photopolymer layer 3 is lowered to a predetermined value, or the plasticizer in the control layer 2 is located. The hologram recording layer 3 is brought into contact with the control layer 2 in order to diffuse into the quantitative photopolymer layer 3 and inhibit the radical polymerization of the monomer therein by a predetermined ratio, or to cause both of them to occur simultaneously. The time from is adjusted, and after that time, hologram exposure is performed on the hologram recording layer 3 as shown in FIG. The exposure amount at this time is an exposure amount sufficient to saturate the photopolymer layer 3. FIG.
FIG. 4 is a diagram showing an example of a change in diffraction efficiency depending on the time from the attachment of the photopolymer layer 3 onto the control layer 2 to the hologram exposure, after contacting the hologram recording layer 3 with the control layer 2. It can be seen that the diffraction efficiency of the hologram recorded in the photopolymer layer 3 can be accurately set to any value including a low value by selecting the time.
【００１４】次いで、図１（ｄ）に示すように、後処理
として全体に紫外線照射を行うことにより、ホログラム
記録層３中の未重合のモノマーを重合させると共に、コ
ントロール層２中のモノマーを重合させてコントロール
層２を固化させる。Next, as shown in FIG. 1 (d), the whole is irradiated with ultraviolet rays as a post-treatment to polymerize the unpolymerized monomer in the hologram recording layer 3 and the monomer in the control layer 2. Then, the control layer 2 is solidified.
【００１５】次に、図１（ｅ）に示すように、全体を加
熱して、ホログラム記録層３中に残る未重合部の重合を
進行させて屈折率変調の増幅を起こさせると共に、コン
トロール層２中に残る未重合部の重合を進行させる。Next, as shown in FIG. 1 (e), the whole is heated to promote the polymerization of the unpolymerized portion remaining in the hologram recording layer 3 to cause amplification of the refractive index modulation, and the control layer. Polymerization of the unpolymerized portion remaining in 2 is promoted.
【００１６】最後に、図１（ｆ）に示すように、ホログ
ラム記録層３からカバーフィルム４を剥離して、ビーム
スプリッター等のホログラム光学素子として用いる。Finally, as shown in FIG. 1F, the cover film 4 is peeled off from the hologram recording layer 3 and used as a hologram optical element such as a beam splitter.
【００１７】以下に、具体例を示すと、厚さ１０ｍｍの
石英ガラス基板上に下記組成のコントロール層を６〜７
μｍの厚さで塗布し、その上に下記組成のフォトポリマ
ー層を６μｍの厚さで塗布し、その上にさらに厚さ５０
μｍのＰＥＴフィルムを積層して多層ホログラム記録体
とした。このホログラム記録体のフォトポリマー層塗布
からの経過時間を種々調節して、ＰＥＴフィルム側から
波長５１４ｎｍのレーザ光を光強度３０ｍＪ／ｃｍ2 で
垂直入射させてホログラム露光をして、ホログラムの干
渉縞を記録した。As a concrete example, a control layer having the following composition is formed on a quartz glass substrate having a thickness of 10 mm by 6 to 7:
It is applied in a thickness of μm, and a photopolymer layer having the following composition is applied thereon in a thickness of 6 μm, and further a thickness of 50 is applied thereon.
A PET film of μm was laminated to obtain a multilayer hologram recording body. Various adjustments were made to the elapsed time from the application of the photopolymer layer of this hologram recording medium, and the hologram film was exposed by vertically injecting a laser beam having a wavelength of 514 nm from the PET film side with a light intensity of 30 mJ / cm 2 , to thereby obtain hologram interference fringes. Was recorded.
【００１８】次いで、ＰＥＴフィルム側から３６５ｎｍ
の紫外線を光強度１００ｍＪ／ｃｍ2 で入射させて紫外
線照射を行った。次いで、１２０℃の温度で１２０分間
加熱処理した。Next, from the PET film side, 365 nm
Was irradiated with ultraviolet light having a light intensity of 100 mJ / cm 2 . Then, heat treatment was performed at a temperature of 120 ° C. for 120 minutes.
【００１９】その後、複屈折性を避けるためにＰＥＴフ
ィルムを剥離し、上記の経過時間に対するホログラムの
回折効率をプロットした結果、図２が得られた。After that, the PET film was peeled off in order to avoid the birefringence, and the diffraction efficiency of the hologram was plotted against the above-mentioned elapsed time. As a result, FIG. 2 was obtained.
【００２０】 〔フォトポリマー層と接着剤層の組成〕 フォトポリマー層 ポリ酢酸ビニル（バインダー） ６６．９ｗ％ アクリルモノマー ２９．０ｗ％ ３，３’，４，４’−テトラ（ｔ−ブチルパーオキシカル ボニル）ベンゾフェノン（開始剤） ４．０ｗ％ ３，３’−カルボニルビス（７−ジエチルアミノクマリン）（色素） ０．１ｗ％ コントロール層 ポリ酢酸ビニル−ポリビニルアルコール共重合体（バインダー） ７８．０ｗ％ アクリルモノマー １４．０ｗ％ ベンゾイソブチルエーテル（紫外線開始剤） ４．０ｗ％ フタル酸ジメチル（可塑剤） ４．０ｗ％ なお、上記のように、コントロール層２としては、フォ
トポリマー層中のモノマーを拡散により受容してフォト
ポリマー層中のモノマー濃度を下げる媒質、あるいは、
フォトポリマー層中へモノマーのラジカル重合を阻害す
る可塑剤等を拡散する媒質であれば、種々選択可能であ
るが、ホログラム記録層２との屈折率差が小さく、好ま
しくは０．１以下の差であり、複屈折性のないものを選
択することが望ましい。[Composition of Photopolymer Layer and Adhesive Layer] Photopolymer Layer Polyvinyl acetate (binder) 66.9 w% Acrylic monomer 29.0 w% 3,3 ′, 4,4′-tetra (t-butylperoxy) Carbonyl) benzophenone (initiator) 4.0 w% 3,3'-carbonylbis (7-diethylaminocoumarin) (dye) 0.1 w% Control layer polyvinyl acetate-polyvinyl alcohol copolymer (binder) 78.0 w% Acrylic monomer 14.0w% benzoisobutyl ether (ultraviolet initiator) 4.0w% dimethyl phthalate (plasticizer) 4.0w% As described above, the control layer 2 diffuses the monomer in the photopolymer layer. A medium that lowers the monomer concentration in the photopolymer layer by
Various media can be selected as long as they diffuse a plasticizer that inhibits radical polymerization of monomers into the photopolymer layer, but the difference in refractive index from the hologram recording layer 2 is small, and preferably a difference of 0.1 or less. Therefore, it is desirable to select one having no birefringence.
【００２１】以上、本発明のホログラム記録における回
折効率制御方法を実施例に基づいて説明してきたが、本
発明はこれら実施例に限定されず種々の変形が可能であ
る。Although the method of controlling the diffraction efficiency in the hologram recording of the present invention has been described above based on the embodiments, the present invention is not limited to these embodiments and various modifications can be made.
【００２２】[0022]
【発明の効果】以上の説明から明らかなように、本発明
のホログラム記録における回折効率制御方法によると、
フォトポリマー中のモノマーの重合度を制御するコント
ロール層上にフォトポリマーからなるホログラム記録層
を積層し、両層の接触時間を選択し、その時間経過後に
ホログラム露光を行うので、コントロール層へホログラ
ム記録層を接触させてからの時間を選択することによ
り、ホログラム記録層に記録されたホログラムの回折効
率を低い値を含めて任意の値に正確に設定することがで
きる。As is clear from the above description, according to the diffraction efficiency control method for hologram recording of the present invention,
A hologram recording layer made of a photopolymer is laminated on the control layer that controls the degree of polymerization of the monomers in the photopolymer, the contact time between both layers is selected, and hologram exposure is performed after that time, so hologram recording is performed on the control layer. By selecting the time after the layers are brought into contact with each other, it is possible to accurately set the diffraction efficiency of the hologram recorded in the hologram recording layer to an arbitrary value including a low value.
【図１】本発明のホログラム記録における回折効率制御
方法の基本原理を説明するための模式図である。FIG. 1 is a schematic diagram for explaining the basic principle of a diffraction efficiency control method in hologram recording of the present invention.
【図２】コントロール層の上にフォトポリマー層を貼り
付けてからホログラム露光するまでの時間に依存した回
折効率の変化の１例を示す図である。FIG. 2 is a diagram showing an example of a change in diffraction efficiency depending on the time from the attachment of a photopolymer layer on a control layer to the hologram exposure.
１…透明基板 ２…コントロール層 ３…ホログラム記録層 ４…カバーフィルム 1 ... Transparent substrate 2 ... Control layer 3 ... Hologram recording layer 4 ... Cover film
Claims (4)
制御するコントロール層上にフォトポリマーからなるホ
ログラム記録層を積層し、両層の接触時間を選択し、そ
の時間経過後にホログラム露光を行うことを特徴とする
ホログラム記録における回折効率制御方法。1. A hologram recording layer comprising a photopolymer is laminated on a control layer for controlling the degree of polymerization of a monomer in the photopolymer, a contact time between both layers is selected, and hologram exposure is performed after the contact time elapses. A method for controlling diffraction efficiency in a characteristic hologram recording.
録層中のモノマーを拡散により受容して前記ホログラム
記録層中のモノマー濃度を下げる媒質、あるいは、前記
ホログラム記録層中へモノマーのラジカル重合を阻害す
る可塑剤を拡散する媒質であることを特徴とする請求項
１記載のホログラム記録における回折効率制御方法。2. A medium in which the control layer receives the monomer in the hologram recording layer by diffusion to lower the monomer concentration in the hologram recording layer, or a plastic which inhibits radical polymerization of the monomer into the hologram recording layer. The method for controlling diffraction efficiency in hologram recording according to claim 1, wherein the medium is a medium that diffuses the agent.
を含有し、前記のホログラム露光後に電離放射線照射を
行うことを特徴とする請求項１又は２記載のホログラム
記録における回折効率制御方法。3. The method for controlling diffraction efficiency in hologram recording according to claim 1, wherein the control layer contains an ionizing radiation initiator, and the ionizing radiation is irradiated after the hologram exposure.
記録層との屈折率差が０．１以下であり、複屈折性のほ
とんどないものであること特徴とする請求項１から３の
何れか１項記載のホログラム記録における回折効率制御
方法。4. The control layer has a refractive index difference with the hologram recording layer of 0.1 or less, and has almost no birefringence, wherein the control layer has almost no birefringence. A method for controlling diffraction efficiency in the hologram recording described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17091995A JPH0922242A (en) | 1995-07-06 | 1995-07-06 | Method for controlling diffraction efficiency in hologram recording |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17091995A JPH0922242A (en) | 1995-07-06 | 1995-07-06 | Method for controlling diffraction efficiency in hologram recording |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0922242A true JPH0922242A (en) | 1997-01-21 |
Family
ID=15913791
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17091995A Pending JPH0922242A (en) | 1995-07-06 | 1995-07-06 | Method for controlling diffraction efficiency in hologram recording |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0922242A (en) |
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-
1995
- 1995-07-06 JP JP17091995A patent/JPH0922242A/en active Pending
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