JPH0125182B2 - - Google Patents
Info
- Publication number
- JPH0125182B2 JPH0125182B2 JP20815782A JP20815782A JPH0125182B2 JP H0125182 B2 JPH0125182 B2 JP H0125182B2 JP 20815782 A JP20815782 A JP 20815782A JP 20815782 A JP20815782 A JP 20815782A JP H0125182 B2 JPH0125182 B2 JP H0125182B2
- Authority
- JP
- Japan
- Prior art keywords
- cathode ray
- ray tube
- permanent magnet
- electron gun
- phosphor screen
- 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.)
- Expired
Links
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 9
- 238000010894 electron beam technology Methods 0.000 claims description 8
- 150000002500 ions Chemical class 0.000 description 11
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010884 ion-beam technique Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
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
- H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
- H01J29/58—Arrangements for focusing or reflecting ray or beam
Description
【発明の詳細な説明】
産業上の利用分野
本発明は陰極線管、とくに省電力形の超小形陰
極線管に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cathode ray tube, and more particularly to a power-saving ultra-small cathode ray tube.
従来例の構成とその問題点
ビデオカメラのビユーフアインダとして、スク
リーン面対角線長が1.5インチまたは１インチ程
度の超小形陰極線管を用いることが多い。かかる
陰極線管は多くの場合、電池により駆動されるの
で、とくに小消費電力で高能率動作をすることが
望まれる。Conventional configurations and their problems Ultra-small cathode ray tubes with a screen diagonal of about 1.5 inches or 1 inch are often used as viewfinders for video cameras. Since such cathode ray tubes are often powered by batteries, it is especially desirable that they operate with low power consumption and high efficiency.
前述のような超小形陰極線管における偏向電力
は、全消費電力に対してかなりの割合を占めるの
で、偏向電力の軽減が省電力化に大きく寄与す
る。偏向電力は陽極電圧に比例するので、陽極電
圧を下げると偏向電力を軽減させ得るが、単に陽
極電圧を下げると螢光体スクリーン面に必要な輝
度を得ることが困難になる。螢光体スクリーン面
にメタルバツクを有しない陰極線管では、比較的
低い陽極電圧で必要なスクリーン面輝度を得るこ
とができるが、螢光体スクリーン面にいわゆるイ
オン焼けを生じる。また、メタルバツクを構成す
るアルミニウム蒸着膜の膜厚を小さくしても陽極
電圧を下げ得るが、この膜厚をたとえば半減させ
て0.03μｍに設定したものにおけるスクリーン面
輝度（陽極電圧2KV）は、メタルバツクを有し
ない場合のスクリーン面輝度（陽極電圧2KV）
に比べて概ね半分となり、十分とは云えない。 Since the deflection power in the above-mentioned ultra-small cathode ray tube occupies a considerable proportion of the total power consumption, reducing the deflection power greatly contributes to power saving. Since the deflection power is proportional to the anode voltage, lowering the anode voltage can reduce the deflection power, but simply lowering the anode voltage makes it difficult to obtain the necessary brightness on the phosphor screen surface. In cathode ray tubes that do not have a metal back on the phosphor screen surface, the required screen surface brightness can be obtained with a relatively low anode voltage, but so-called ion burn occurs on the phosphor screen surface. Also, the anode voltage can be lowered by reducing the thickness of the aluminum vapor-deposited film constituting the metal back, but the screen surface brightness (anode voltage 2KV) when this film thickness is halved, for example, to 0.03 μm, is lower than that of the metal back. Screen surface brightness without (anode voltage 2KV)
This is about half compared to the previous year, and cannot be said to be sufficient.
発明の目的
したがつて本発明の目的は、メタルバツクを有
することなくイオン焼けを生じない高能率陰極線
管を提供することにある。OBJECTS OF THE INVENTION Therefore, it is an object of the present invention to provide a high efficiency cathode ray tube that does not have a metal back and does not cause ion burnout.
発明の構成
本発明の陰極線管は、静電集束形電子銃とこの
電子銃にメタルバツクを介することなく向き合う
螢光体スクリーンとを備えたものにおいて、管軸
に略平行な電子ビーム集束磁界を発生する永久磁
石を、前記電子銃の陰極と偏向ヨークとの間に設
置するのであつて、これを以下図面に示した実施
例とともに詳しく説明する。Structure of the Invention The cathode ray tube of the present invention is equipped with an electrostatic focusing electron gun and a phosphor screen that faces the electron gun without intervening a metal bag, and generates an electron beam focusing magnetic field approximately parallel to the tube axis. A permanent magnet is installed between the cathode and the deflection yoke of the electron gun, and this will be described in detail below with reference to embodiments shown in the drawings.
実施例の説明
第１図においてガラスバルブ１のネツク部２に
封入されている静電集束形電子銃３は、陰極４、
制御電極５、加速電極６、集束電極７および陽極
８を備えてなるとともに集束電極７の内周面に円
環状の永久磁石９を付設してなり、永久磁石９は
管軸に略平行な電子ビーム集束磁界を生成する。DESCRIPTION OF THE EMBODIMENTS In FIG.
It is equipped with a control electrode 5, an accelerating electrode 6, a focusing electrode 7, and an anode 8, and a circular permanent magnet 9 is attached to the inner peripheral surface of the focusing electrode 7. Generate a beam focusing magnetic field.
一方、ガラスバルブ１のフエースパネル１０の
内面に付設されている螢光体スクリーン１１は、
メタルバツクを有しておらず、電子銃３とはメタ
ルバツクを介することなく向き合つている。１２
は陽極８と同電位に保持される内部導電膜を示
す。 On the other hand, the phosphor screen 11 attached to the inner surface of the face panel 10 of the glass bulb 1 is
It does not have a metal back and faces the electron gun 3 without a metal back. 12
indicates an internal conductive film held at the same potential as the anode 8.
電子銃３から放射された変調電子ビームは、偏
向ヨーク１３による水平および垂直偏向磁界によ
つて偏向作用を受け、螢光体スクリーン１１の面
上にモノクローム画像が映出されるのであるが、
集束電極７に射入した変調電子ビームは、永久磁
石９による電子ビーム集束磁界で予備集束された
のち、集束電極７と陽極８との間に生成される主
電子レンズにより最終的な集束作用を受ける。す
なわち、集束電極７に射入した変調電子ビーム
は、永久磁石９による磁界と前記主電子レンズと
によつて２段集束されることになる。 The modulated electron beam emitted from the electron gun 3 is deflected by the horizontal and vertical deflection magnetic fields of the deflection yoke 13, and a monochrome image is projected on the surface of the phosphor screen 11.
The modulated electron beam incident on the focusing electrode 7 is prefocused by the electron beam focusing magnetic field generated by the permanent magnet 9, and then is finally focused by the main electron lens generated between the focusing electrode 7 and the anode 8. receive. That is, the modulated electron beam incident on the focusing electrode 7 is focused in two stages by the magnetic field of the permanent magnet 9 and the main electron lens.
一方、制御電極５と加速電極６との間のクロス
オーバ付近で生じた陰イオンは、電子ビームと同
様に前記主電子レンズにより集束されるが、電子
に比して質量が大きいため、永久磁石９による集
束磁界および偏向ヨーク１３による偏向磁界の影
響をほとんど受けない。このため、前記主レンズ
により不完全に集束された陰イオンは螢光体スク
リーン１１の中心部を中心とする比較的広い領域
に射突し、螢光体スクリーンの中心部にのみイオ
ン焼けを生じることがない。 On the other hand, negative ions generated near the crossover between the control electrode 5 and the accelerating electrode 6 are focused by the main electron lens in the same way as the electron beam, but because they have a large mass compared to electrons, they cannot be used as permanent magnets. It is hardly affected by the focusing magnetic field by 9 and the deflection magnetic field by deflection yoke 13. Therefore, the anions incompletely focused by the main lens impinge on a relatively wide area centered on the center of the phosphor screen 11, causing ion burn only in the center of the phosphor screen. Never.
これを第２図によりさらに詳しく説明すると、
同図に実線で示す電子ビーム１４は、永久磁石に
よる磁界レンズ１５および主電子レンズ１６によ
り集束されて螢光体スクリーン１１の面上の一点
に収斂するのに対し、破線で示す陰イオンビーム
１７は主として主電子レンズ１６のみで集束され
るため、螢光体スクリーン１１の面上の一点に収
斂せず、比較的広い領域に分散する。このため、
メタルバツクを有していないにもかかわらずイオ
ン焼けを生じることがかなり緩和される。 To explain this in more detail using Figure 2,
The electron beam 14 shown by the solid line in the figure is focused by the magnetic field lens 15 made of a permanent magnet and the main electron lens 16 and converges on a point on the surface of the phosphor screen 11, whereas the negative ion beam 17 shown by the broken line Since the light is mainly focused only by the main electron lens 16, the light does not converge to a single point on the surface of the phosphor screen 11, but is dispersed over a relatively wide area. For this reason,
Even though it does not have a metal back, the occurrence of ion burn is considerably reduced.
なお、前記実施例では永久磁石を集束電極の内
周面に付設したが、同電極の外周面上に同軸的に
設けてもよい。また、永久磁石は集束電極に付設
する要はなく、要するに、陰極と偏向ヨークとの
中間点付近に同軸的に設置されておればよい。 Although the permanent magnet was attached to the inner circumferential surface of the focusing electrode in the above embodiment, it may be coaxially provided on the outer circumferential surface of the focusing electrode. Further, the permanent magnet does not need to be attached to the focusing electrode, and in short, it is sufficient if it is coaxially installed near the midpoint between the cathode and the deflection yoke.
発明者らは、本発明を使用した超小形陰極線管
を試作した。この陰極線管に組み込んだ永久磁石
は、約70ガウスの磁界レンズを生成し、直径約
0.15mmのビームスポツト（輝点）が螢光体スクリ
ーン面上に得られた。そして、前記永久磁石を除
去したものにおけるビームスポツトの直径は約
1.5mmであつたので、イオンスポツトの直経もこ
の程度に、つまり約10倍に拡大される。これは面
積にして約100倍である。イオン焼けに対して強
いP45螢光体（Y2O2S：Tbを用いたが、寿命試験
を行なつたところ、1000時間を越えてもイオン焼
けの微候はほとんどみられなかつた。1000時間後
における管内真空度は徐々に良好となつてくるの
で、イオンの発生量が減る。したがつて短期間で
イオン焼けする危惧はなく、十分実用に供し得
る。 The inventors prototyped an ultra-small cathode ray tube using the present invention. The permanent magnet built into this cathode ray tube generates a magnetic field lens of approximately 70 Gauss, with a diameter of approximately
A 0.15 mm beam spot was obtained on the phosphor screen surface. The diameter of the beam spot with the permanent magnet removed is approximately
Since it was 1.5 mm, the direct diameter of the ion spot was also enlarged to this extent, that is, about 10 times. This is approximately 100 times the area. We used a P45 phosphor (Y 2 O 2 S: T b , which is resistant to ion burnout), and when we conducted a life test, there was almost no sign of ion burnout even after 1000 hours. After 1000 hours, the degree of vacuum inside the tube gradually becomes better, so the amount of ions generated decreases.Therefore, there is no risk of ion burnout in a short period of time, and it can be put to practical use.
発明の効果
本発明の陰極線管は前述のように構成されるの
で、陰極電圧を下げても十分な輝度が得られ、し
かもイオン焼けの心配がほとんどなく、偏向電力
の低減、管能率の向上を得ることができる。Effects of the Invention Since the cathode ray tube of the present invention is configured as described above, sufficient brightness can be obtained even if the cathode voltage is lowered, and there is almost no fear of ion burnout, reducing deflection power and improving tube efficiency. Obtainable.
第１図は本発明を実施した陰極線管の側断面
図、第２図は同陰極線管の永久磁石による磁界レ
ンズと主電子レンズの動作説明図である。
３……電子銃、４……陰極、７……集束電極、
９……永久磁石、１１……螢光体スクリーン、１
３……偏向ヨーク。
FIG. 1 is a side sectional view of a cathode ray tube embodying the present invention, and FIG. 2 is an explanatory diagram of the operation of a magnetic field lens and a main electron lens formed by permanent magnets of the same cathode ray tube. 3... Electron gun, 4... Cathode, 7... Focusing electrode,
9... Permanent magnet, 11... Fluorescent screen, 1
3...Deflection yoke.
Claims (1)
クを介することなく向き合う螢光体スクリーンと
を備えた陰極線管において、管軸に略平行な電子
ビーム集束磁界を発生する永久磁石を、前記電子
銃の陰極と偏向ヨークとの間に設置したことを特
徴とする陰極線管。1. In a cathode ray tube equipped with an electrostatic focusing electron gun and a phosphor screen that faces the electron gun without intervening a metal bag, a permanent magnet that generates an electron beam focusing magnetic field approximately parallel to the tube axis is attached to the electron gun. A cathode ray tube characterized in that it is installed between a cathode and a deflection yoke.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20815782A JPS5998441A (en) | 1982-11-27 | 1982-11-27 | Cathode ray tube |
| EP83108643A EP0106092A1 (en) | 1982-09-10 | 1983-09-01 | Cathode ray tube |
| EP86108224A EP0206216A1 (en) | 1982-09-10 | 1983-09-01 | Cathode ray tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20815782A JPS5998441A (en) | 1982-11-27 | 1982-11-27 | Cathode ray tube |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5998441A JPS5998441A (en) | 1984-06-06 |
| JPH0125182B2 true JPH0125182B2 (en) | 1989-05-16 |
Family
ID=16551591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20815782A Granted JPS5998441A (en) | 1982-09-10 | 1982-11-27 | Cathode ray tube |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5998441A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6286644A (en) * | 1984-06-27 | 1987-04-21 | Matsushita Electronics Corp | Cathode-ray tube |
-
1982
- 1982-11-27 JP JP20815782A patent/JPS5998441A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5998441A (en) | 1984-06-06 |
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