JPS584247A - Projection-type cathode-ray tube - Google Patents

Projection-type cathode-ray tube

Info

Publication number
JPS584247A
JPS584247A JP9009581A JP9009581A JPS584247A JP S584247 A JPS584247 A JP S584247A JP 9009581 A JP9009581 A JP 9009581A JP 9009581 A JP9009581 A JP 9009581A JP S584247 A JPS584247 A JP S584247A
Authority
JP
Japan
Prior art keywords
pressure
projection
ray tube
face
glass plate
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
Application number
JP9009581A
Other languages
Japanese (ja)
Inventor
Takashi Sugawara
喬 菅原
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP9009581A priority Critical patent/JPS584247A/en
Priority to DE19823221626 priority patent/DE3221626A1/en
Publication of JPS584247A publication Critical patent/JPS584247A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/006—Arrangements for eliminating unwanted temperature effects
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/86—Vessels; Containers; Vacuum locks

Landscapes

  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Abstract

PURPOSE:To improve the thermal-radiation characteristic of the face of a projection-type cathode-ray tube by adjusting the pressure of a space provided between the said face and a front glass plate to be smaller than the atmospheric pressure and larger than the internal pressure of the tube. CONSTITUTION:A front glass plate 7 is airtightly stuck to the outside of a face part 2 with an adhesive 6 by being fixed at the opening end of a side wall 10. In addition, a space 11 formed between a glass cylnder 9 and the face part 2 is maintained at a pressure smaller than the atmospheric pressure (1 atmospheric pressure) and larger than the internal pressure of a tube (10<-6> or 10<-7> Torr). Owing to the above constitution, since the face part 2 on which an electron beam discharged from an electron gun 4 directly falls on, is in contact with the external air with a vacuum space 11 with low pressure interposed between the part 2 and the external air, the intensity of the part 2 can be maintained, and a sufficient thermal-radiation effect can be obtained.

Description

【発明の詳細な説明】 この発明はフェース部の外側に前面ガラス板を設けた投
写形陰極線管に闘すｈ屯のであ為。DETAILED DESCRIPTION OF THE INVENTION The present invention is a development of a projection type cathode ray tube in which a front glass plate is provided on the outside of the face portion.

家庭用０投写形テレビシロンの殆んどは、陰極線管上の
高輝度画像を屈折レンズを用いて映写スクリーン上に拡
大投写や為方式を採用している。Most home-use 0-projection televisions employ a method in which a high-brightness image on a cathode ray tube is enlarged and projected onto a projection screen using a refractive lens.

周知のように、屈折レンズには２種の収差、すなわち、
像面湾曲収差と広義の球面収首とがあり一ζＯ両者を共
ｔでＩｉｂだけ小冨（することがレンズ設計のボインシ
である。しかし、この両者は一般に叩矛盾するものであ
り、特に屈折率の比較的小ざなプラスチックを使用した
１折しンーズにおいては、像面補正用に断念にレンズを
追加する必要があ口、屈折レンズの性能向上に大暑な障
害となっているばか抄でなく、価格を高−ものにしてい
る・ このような欠点を解決するために、第１ｇ１Ｋ示すよう
な投写形陰極線管Ｓ提案されている。同図におい？％（
１）は陰極線管であり、内部にフェースＭ（２）の内面
に塗布冨れ魚螢光１１（３）と電子ビームを射出−ｆ為
電子銃（４）とを含んでいる。この陰極線管（１）の特
徴Ｊ：＋るところは、フェースｍｓ　（２）の内面、外
面の形状を屈折レンズ系（５）の側ｃ凹とＬｌｅと６Ｃ
＆る・これは、屈折レンズ系（６）による最適ホーカス
点を連ねることによりで龜る面、いわゆ為最適像面が屈
折レンズ系（６）の側ＴＩｃｌ！ｌとな為という像面湾
曲収差を、画面の１辺では光学系の倍率を高＜Ｌ、中央
部では光学系の倍率を小５く＋為ことにより最適像面を
平坦化し°ようとする−ので６４この提案は、確かに、
屈折レンズ系（６）の高性能化と低価格化をもたらすも
のではあるが一一方一投写形陰極着管の信頼性を低下さ
せるという重大欠点があることが判明した＠すなわち、
嬉１ｗｉに示されるような投写ＷＩ陰極纏管は、フェー
ス−（２）が屈折レンズ系（５）の偏に向かって口とな
っているために、大気圧に弱いということである。As is well known, refractive lenses have two types of aberrations:
There are field curvature aberration and spherical convergence in a broad sense, and the key to lens design is to reduce both ζO by Iib at t.However, these two terms are generally contradictory, and in particular refraction For single-refraction lenses that use plastic with a relatively small index, it is necessary to add a lens for image plane correction, which is not a stupid thing that has become a huge obstacle to improving the performance of refraction lenses. In order to solve these drawbacks, a projection type cathode ray tube S as shown in No. 1g1K has been proposed.
Reference numeral 1) is a cathode ray tube, which includes therein a fluorescent light 11 (3) coated on the inner surface of a face M (2) and an electron gun (4) for emitting an electron beam. The characteristic J:+ of this cathode ray tube (1) is that the shape of the inner and outer surfaces of the face ms (2) is the same as that of the refractive lens system (5), which is concave, Lle, and 6C.
&ru・This is a surface that is blurred by connecting the optimal focus points of the refractive lens system (6), so-called the optimal image surface is on the side of the refractive lens system (6) TIcl! In order to reduce the field curvature aberration, which is caused by l, we try to flatten the optimal image plane by increasing the magnification of the optical system on one side of the screen to a high <L, and at the center, decreasing the magnification of the optical system to 5+. -So64 This proposal is certainly
Although this system improves the performance and lowers the price of the refractive lens system (6), it has been found that it has a serious drawback in that it reduces the reliability of the single projection cathode tube.
The projection WI cathode-wrapped tube as shown in Figure 1wi is vulnerable to atmospheric pressure because the face (2) serves as a mouth toward the polarization of the refractive lens system (5).

第２図は上記の改善策を施した投写形陰極線管（１）を
示す、この陰極線管（υの製造には、まずフェースＩＩ
　（２）　ノ内面に螢光ＥｌＦ（３）％形成ｇし、りｔ
ｎ”ｅ４ｉ１着Ｍ（６）ＩＣＪ、　ｂ　ｙ　ｚ　−ｘ　
ｕ（２）ｔｏ外＊ｃｉ＊面ガラス（吟が接着される。し
かるのちに、電子銃（４）が封じ込められ一排気装置に
より内部の空気などＯガスがスｇ　（２）　トの−のガ
スは、フェース部（２）の周辺部につけられた板厚方向
に貫通するガス接電孔（ａ）を通して１１１％冨れる・
このようにして作られた投写廖陰緬纏蕾（１）では、従
来フェースＩＩ　（り　［加わって■な大気圧は、ナベ
てＩＩ［ｌガラス板（７）に加わることにな抄、一方、
この前面ガラス板（′Ｆ）は平板で＆為ので亀大気圧に
よる信慣性低下は全く問題とならない。Figure 2 shows a projection cathode ray tube (1) with the above-mentioned improvement measures.
(2) Formation of fluorescent ElF(3)% on the inner surface of the
n”e4i 1st place M (6) ICJ, b y z -x
The electron gun (4) is then sealed and the exhaust device removes O gas such as the air inside (2). The gas is enriched by 111% through the gas contact hole (a) that penetrates in the thickness direction of the face part (2).
In the projection screen (1) created in this way, the atmospheric pressure that is conventionally applied to the face II ,
Since this front glass plate ('F) is a flat plate, a decrease in reliability due to atmospheric pressure is not a problem at all.

なお、ｌｌｌ５ｌＩＩＩｖｃ示すように一上記一面ガラ
ス板（γ）にレンズ咋用をもっ曲−１念と見ば前面ガラ
ス（７）の７エース謳側（７＆）を平らとして、これと
逆の外側（７ｂ）を国とするような曲面を構成すること
がある。このようにすることによって、ｌｌｌ１ガラス
板（γ）Ｋレンズ系（５）の作用の少なくとも一部をも
なせろことがで禽、あるーは少なくとも像面湾曲収差レ
ンズと同様の効果をもなせ、これによって７工−ス部（
１）の内外面の［！ｉｅ程度を織じ、螢光面（３）のｍ
成を容易にすることがで禽る。In addition, as shown in lll5lIIIvc, if you put a lens plate on the one-sided glass plate (γ) above, make the 7 ace side (7 &) of the front glass (7) flat, and the opposite side (7 &). 7b) may be constructed as a country. By doing so, it is possible to achieve at least a part of the effect of the glass plate (γ)K lens system (5), or at least the same effect as that of a curvature of field aberration lens. , As a result, the 7th construction department (
1) Internal and external [! m of the fluorescent surface (3)
Birds can be easily formed.

しかし、上記のような構成＃／ｉ−投写彫陰極纏管の使
用吹製の特異性を全（無視しｔもの１１重大な欠点のあ
ることが分つな、それは、一般的ｖｃ％投写形陰極纏管
は非常に大食なパフ−密度（ＩＩ極加連電圧Ｘ単位−檀
当りの電流密度）で使用冨れるため、に、螢光面の温度
上昇が見られ、この温度上昇に起因す為螢光体の温度消
光の防止を図るために、歓熱効果をよく中ることは自わ
めて重要である・ところが、ＩＩ２［、嬉墨ａＩｋ示冨
れた構成では、電子銃（４）からの電子ビームが直ＩＩ
ｈたるフェース部（８）が高真空領域をは冨んで外気と
擁しているために一員常に昇温することが分った。However, if we ignore all the peculiarities of the use of projection-carved cathode-wrapped tubes as described above, it turns out that there are 11 serious drawbacks, which are the general VC% projection type. Since the cathode-coated tube is used at a very high puff density (II pole applied voltage x unit - current density per tube), an increase in temperature of the fluorescent surface is observed, and this Therefore, in order to prevent temperature quenching of the phosphor, it is extremely important to fully absorb the heating effect. 4) The electron beam from
It has been found that the face part (8), which is the main part, is exposed to outside air in a high vacuum region, so that the temperature of the face part (8) constantly rises.

この発明は上記欠点を解消するためにな冨れたもので、
フェース部とそｅ１面ガラス板とのＩＩの空間の圧力を
大気圧よ伽小畜（、管内圧力よ抄大吉（すること（よ抄
、フェース部放熱特性を改善で自るようにしな投写形陰
極線管を提供することを目的としている。This invention has been developed to overcome the above-mentioned drawbacks.
The pressure in the space between the face part and the glass plate on the first side is equal to atmospheric pressure, and the pressure inside the pipe is determined by improving the heat dissipation characteristics of the face part. The purpose is to provide cathode ray tubes.

以下、この発明の一実施例を図１ｉにもとづいて説明す
る。An embodiment of the present invention will be described below with reference to FIG. 1i.

４４図はこの発明にかかる投写形陰極纏蕾の一部切欠側
面図である。このＷにお−て、（・）バ一端を関ロＬｍ
ガラス筒で−このガラス筒（＠の端面慕は陰極線１ｊ（
１）の７工−ス部（２）に対向する前面ガラス板（？）
となり、かり＊ｇ嬬取付は用の側ａｍとなって−る・す
なわち％＊ａｉガラス板（吟は側壁に）の開口偏肩縁に
お−で、接着剤（＠を介してフェース部（２）の外側に
％＠ｅｃ接着冨接着−る。家な、上記ガラス筒（呻と７
エースＩＩＩ（りとで廖成冨れた空間（ロ）は、本％Ｅ
Ｅ（１％ＩＥ）よ−小菖（、管内圧力（１「６あるーは
Ｉ　Ｑ　　ｒｏｒｒ）よ鋤大食−圧力状態に保持冨れ、
かつその亀めのｖ１１１Ｉ＠の排気は、上記側ｌ１ｏ４
に設けられた＃Ｐ％孔■を逓して行なわれてお鯵、１１
４図で＃ｆ−この＃気孔鱒はａに封じ切った被層を示し
て―る。FIG. 44 is a partially cutaway side view of the projection type cathode-bound bud according to the present invention. At this W, move one end of the (・) bar to the Sekiro Lm.
In a glass tube - The end face of this glass tube (@ is the cathode ray 1j (
The front glass plate (?) facing the 7th floor part (2) of 1)
Therefore, to attach the lever, attach it to the opening edge of the glass plate (Gin is on the side wall) on the side of the glass plate (Gin is on the side wall), and apply the adhesive (@) to the face part ( 2) Adhesive glue is attached to the outside of the glass tube.
Ace III
E (1% IE) - small irises (, pressure inside the pipe (1 "6 is I Q rorr) - maintain the pressure state,
And the exhaust of the turtle v111I@ is on the above side l1o4
Horse mackerel, 11
In Figure 4, #f-this #stomata trout shows the sealed layer in a.

上記構成においては、電子銃（４）からの電子ビームが
直接あなる７エースＩＩ（２）繻低真空領域□空間（ロ
）をはざんで外気と接す為ため、フェースＩＩ（υ０強
度を保持すると同時に、充分＆被熱効果を得ることがで
自為、実験によれば一上記空Ｗ４（ロ）の圧力は１０−
５ＤｔＪｔｏｒｒ　ａ［”ｔ’、？！−ｘｇｃａａ強ｇ
および歓熱につ−で充分な効果のあることが分つな・ま
た−この空間＠は、いったん真空ｅｅ冨れたのち＃ｅ％
空気よ）分子量の小高い気体、セよえば水素１ヘリウム
などで上ＥｆＥ力に置換冨れ為と一歓熱効Ｍにお−て、
よ―すぐｔＬ亀４１１性が得られ為ことも分ったー ｍｓ図に示すようＷｌｅ、９面ガラス板（ηと側−（至
）とを別体Ｗｃ形成−ｆることがで禽、この真書（γ）
、■関を接着剤（６）で接合＋為構成によっても、１１
４１１の場合と同じ効果を得ることがで自る・宜魚％前
面ガラス板（つけフラン）＆亀のとしなが、そＯ断面形
状轄任意ＩＣ１！電で１為も０で、たとえば第３図で説
明しなような白面をもなせることがで１／１ムまた、フ
ェース部（２）の螢光面（助を設は亀内面はフラン）Ｉ
Ｉｃ形成すると七がで自る。In the above configuration, the electron beam from the electron gun (4) directly contacts the outside air across the 7 Ace II (2) low vacuum region □ space (B), so the face II (υ0 intensity is According to experiments, the pressure in the above air W4 (b) is 10-
5DtJtorr a["t',?!-xgcaa strong g
It turns out that there is a sufficient effect in relation to and enthusiasm.Also, once this space is filled with vacuum, #e%
Air) A gas with a slightly high molecular weight, such as hydrogen and helium, is substituted with the EfE force and has a thermal effect M.
As shown in the ms figure, it was possible to form a separate Wc from the 9-sided glass plate (η and side). This true book (γ)
, 11 by joining the gate with adhesive (6) +
The same effect as in the case of 411 can be obtained by using the front glass plate (with a flange) and the tortoise, but with any IC1 in the cross-sectional shape! For example, it is possible to create a white surface as shown in Fig. 3. Also, the fluorescent surface of the face part (2) ) I
When Ic is formed, seven will appear.

以上の説明から解るように、この発明によれ１フ工−ス
部とその外側に接着冨れた前面ガラス板との間の空間の
圧力を大気圧より小高（、管内圧力よロス１くしたので
、電子ビームが直１１＆＊る上ｅフェースｍｅ腋熱特性
を改譬して、画質の向上を■る投写形陰極線管を提供す
ることかで禽る・As can be seen from the above explanation, the present invention allows the pressure in the space between the first floor and the front glass plate glued to the outside to be slightly higher than atmospheric pressure (and to reduce the pressure loss by 1 compared to the pressure inside the pipe). Therefore, we would like to provide a projection cathode ray tube that improves image quality by modifying the heat characteristics of the upper e-face and armpit where the electron beam is directed.

【図面の簡単な説明】[Brief explanation of drawings]

Ｉ１１図１ｋｖｈＬＩｉｉ厘は従来の投写形陰極線管の
一１ｉｉｓａｔ欠側面図−箇４１１はこの発明の一実施
例にかか為投写形陰極線管の−ｌｃ＠欠側ｔｍｉｉｉ％
ＩＩＳ■はこの発明の他の実施例ｋかかる投写彫陰極纏
管の一部切欠側面厘である・ （り・−フェース部、（３）・・・螢光ｌｌ１％（７）
−前面ガラス板、（ロ）−ａｍ なお、図中同一符号は同−ｔたけ相当部分を示す・ 代理人　葛舒信−（外１名） 第２図 第４図 手続補正書（自発）６．補 特許庁１２官殿　　　　　　　　　　　　　　　１補ム
・明 （１） ２、発明の名称　　　　　　　　　　　　　　　　　　
　　と投写形陰極−管 ３、補正をする者 正の対象 細書の「特許請求の範囲」および「発明の詳説間」の各
欄。 正の内容 細書： 特許請求の範囲を別紙の通り補正します。 ＠６頁第２０行目客 「１０→＝。γ５００Ｔ０．．Ｊとあゐｔ　ｒｏ、１〜
”’Ｔｏｒｒ　Ｊ訂正しオす。 以　　上 別　　紙 補正後の特許請求の範囲 ｒ　（１）　ｆ元画を有するフェース部の少なくと１外
面が凹形状であり、かつ王妃フェース部の外１ｍＫ前面
ガラス板が接着された投写形陰極線管におｈて、上記フ
ェース部と上記前面ガラス板との間の空間を大電圧より
小さく、管内圧力より太きくしたことを特徴とする投写
形陰極線管。 （２１上記空間の圧力ｔ０．１〜”’Ｔｏｒｒとした特
許請求の範囲第１項記載の投写形陰極線管。 （３）上記空間に含まれる気体を空気より分子量の小さ
な気体とした特許請求の範＠第１項または第２項記載の
投写形陰極線管。 （４）上記空間に含まれる気体をヘリウムあるいけ水素
とした特許請求の範囲第５項記載の投写形陰極線管、」Figure I11 is a cutaway side view of a conventional projection cathode ray tube. Section 411 is an embodiment of the present invention.
IIS■ is a partially cut-out side surface of a projection-engraved cathode tube according to another embodiment of the present invention.
-Front glass plate, (b) -am In addition, the same reference numerals in the drawings indicate parts corresponding to the same number. Agent Ge Shuxin - (1 other person) Figure 2 Figure 4 Procedural amendment (voluntary) 6. Supplementary Patent Office 12 Offices 1 Supplementary Patent Office (1) 2. Title of the invention
and the projection type cathode tube 3, the "Claims" and "Detailed Description of the Invention" columns of the subject specification of the person making the amendment. Correct description of contents: The claims are amended as shown in the attached sheet. @Page 6, line 20 Customer “10→=.γ500T0..J and Atro, 1~
``'Torr J Corrected. Above appendix: Scope of patent claims after amendment (1) At least one outer surface of the face portion having an original image is concave, and 1 mK in front of the outside of the queen face portion 1. A projection cathode ray tube to which a glass plate is bonded, characterized in that a space between the face portion and the front glass plate is smaller than a large voltage and larger than an internal pressure of the tube. (21) A projection type cathode ray tube according to claim 1, in which the pressure in the space is set to t0.1 to ''' Torr. (4) The projection cathode ray tube according to claim 5, wherein the gas contained in the space is helium or hydrogen.

Claims (4)

【特許請求の範囲】[Claims] （１）螢光面を有する７工−ス部の少なくとも外面が凹
形状であり、かつ上記７工−ス部の外１ｇに前面ガラス
板が接着された投写形陰極線管において、上記フェース
部と上記前面ガラス板との間の空間を大気圧より小さく
、管内圧力より大きくし之ことを特徴とする投写形陰極
線管。(1) In a projection cathode ray tube in which at least the outer surface of the 7-piece portion having a fluorescent surface is concave and a front glass plate is adhered to 1g outside the 7-piece portion, the face portion and A projection cathode ray tube characterized in that the space between the front glass plate and the front glass plate is smaller than atmospheric pressure and larger than the pressure inside the tube. （２）上記空間の圧力を１０〜Ｓ　ＯＯＴａｒｔ　　と
した特許請求の範囲第１項記載の投写形陰極線管。(2) The projection type cathode ray tube according to claim 1, wherein the pressure in the space is 10 to S OOTart . （３）上記空間に含まれる気体を空気より分子量の小さ
な気体とした特許請求の範囲第１項または第２項記載の
投写形陰極纏管。(3) The projection type cathode-wrapped tube according to claim 1 or 2, wherein the gas contained in the space has a molecular weight smaller than that of air. （４）上記空間に含まれる気体をヘリウムあるいは水素
とした特許請求の範＠１１Ｍ５項記載の投写形陰極線管
。(4) The projection cathode ray tube according to claim @11M5, wherein the gas contained in the space is helium or hydrogen.
JP9009581A 1981-06-08 1981-06-08 Projection-type cathode-ray tube Pending JPS584247A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP9009581A JPS584247A (en) 1981-06-08 1981-06-08 Projection-type cathode-ray tube
DE19823221626 DE3221626A1 (en) 1981-06-08 1982-06-08 Projection cathode ray tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9009581A JPS584247A (en) 1981-06-08 1981-06-08 Projection-type cathode-ray tube

Publications (1)

Publication Number Publication Date
JPS584247A true JPS584247A (en) 1983-01-11

Family

ID=13988955

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9009581A Pending JPS584247A (en) 1981-06-08 1981-06-08 Projection-type cathode-ray tube

Country Status (2)

Country Link
JP (1) JPS584247A (en)
DE (1) DE3221626A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1047869C (en) * 1994-09-16 1999-12-29 株式会社金星社 Braun tube for a projection television receiver

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19840590A1 (en) * 1998-09-05 2000-03-09 Brigitte Kobilarov Concave display screen front panel for PCs and TVs forms section of a sphere with center point front of the screen at normal distance for using display for normal size of front panel

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2172775A (en) * 1935-01-30 1939-09-12 Telefunken Gmbh Optical system
US2569654A (en) * 1948-11-19 1951-10-02 John M Cage Cathode-ray tube
DE1804396U (en) * 1957-01-26 1960-01-21 Telefunken Gmbh VACUUM VESSELS, IN PARTICULAR VACUUM VESSELS FOR CATHODE BEAM TUBES.
GB2007907B (en) * 1977-10-19 1982-02-24 Matsushita Electric Ind Co Ltd Cathode ray tube with a concave surface
AU522177B2 (en) * 1978-02-06 1982-05-20 Esplin Kloss Henry Projection tv tube
JPS597731Y2 (en) * 1979-06-07 1984-03-09 ソニー株式会社 cathode ray tube equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1047869C (en) * 1994-09-16 1999-12-29 株式会社金星社 Braun tube for a projection television receiver

Also Published As

Publication number Publication date
DE3221626A1 (en) 1983-02-03
DE3221626C2 (en) 1988-09-08

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