JPH0117812Y2

JPH0117812Y2 -

Info

Publication number: JPH0117812Y2
Application number: JP18170182U
Authority: JP
Priority date: 1982-11-30
Filing date: 1982-11-30
Publication date: 1989-05-24
Also published as: JPS5985564U

Description

【考案の詳細な説明】 (イ) 産業上の利用分野この考案は陰極線管用電子銃に関する。[Detailed explanation of the idea] (b) Industrial application fields This invention relates to an electron gun for cathode ray tubes.

(ロ) 従来技術陰極線管用電子銃の従来一例を第１図及び第２
図に示すと、１はバルブのネツク部、２はネツク
部１内に収納された電子銃である。電子銃２は複
数の電極、例えば第１〜第５グリツド電極G₁〜
G₅を所定の間隔で同一直線上に一連に配列して
各々の周面に突設した支持ピン３の先端部をガラ
ス等の絶縁性支持棒４に埋設し一体化したもの
で、先頭電極（第５グリツド電極）G₅には前方
にゲツター容器５を電子銃２と同軸に支持し、側
壁に複数の例えば４個の支持バネ６が固定されて
いる。第５グリツド電極G₅の先端開口部にはフ
ランジ７が一体に設けられ、このフランジ７の
90゜間隔の計４箇所に設けた切欠き部８から第５
グリツド電極G₅の周面に後端を溶接した支持バ
ネ６が前方へと導出されている。支持バネ６は第
３図に示すような帯板状の金属板で、その遊端が
ネツク部１の内面に弾圧接触して電子銃２の前部
をネツク部１内に保持している。ゲツター容器５
は第５グリツド電極G₅から延びる支持片９の先
端に固定され、前方に開口した環状容器で、陰極
線管動作時に内部に収納したゲツター材１０を効
果的に前方へと飛散させる構造にしてある。(b) Prior art An example of a conventional electron gun for a cathode ray tube is shown in Figures 1 and 2.
As shown in the figure, 1 is a neck portion of a valve, and 2 is an electron gun housed within the neck portion 1. The electron gun 2 has a plurality of electrodes, for example, first to fifth grid electrodes _G1 to
G ₅ are arranged in a series on the same straight line at predetermined intervals, and the tips of support pins 3 protruding from the circumferential surface of each are embedded in an insulating support rod 4 made of glass or the like, and integrated. (Fifth grid electrode) A getter container ₅ is supported coaxially with the electron gun 2 in front of G5, and a plurality of, for example, four support springs 6 are fixed to the side wall. A flange 7 is integrally provided at the tip opening of the fifth grid electrode _G5 .
Notches 8 to 5 are provided at four locations at 90° intervals.
A support spring 6 whose rear end is welded to the circumferential surface of the grid electrode _G5 extends forward. The support spring 6 is a band-shaped metal plate as shown in FIG. 3, and its free end comes into pressure contact with the inner surface of the neck portion 1 to hold the front portion of the electron gun 2 within the neck portion 1. getter container 5
is an annular container that is fixed to the tip of the support piece 9 extending from the fifth grid electrode _G5 and is open to the front, and is structured to effectively scatter the getter material 10 stored inside when the cathode ray tube is operated. .

ところで、上記陰極線管の動作時にゲツター容
器５より飛散するゲツター材１０の一部はどうし
ても後方へと飛散して第５グリツド電極５のフラ
ンジ７の切欠き８やビーム透過孔などを通過し、
第４グリツド電極G₄や第３グリツド電極G₃、及
び支持棒４に付着して耐圧特性を低下させること
がある。これを防止する手段として第５グリツド
電極G₅の前方開口部にゲツター遮蔽板１１を取
付けてビーム透過孔からのゲツター内方飛散を防
止したりしているが不十分であり、改善の余地が
あつた。 By the way, a part of the getter material 10 that is scattered from the getter container 5 during operation of the cathode ray tube is inevitably scattered backwards and passes through the notch 8 of the flange 7 of the fifth grid electrode 5, the beam transmission hole, etc.
It may adhere to the fourth grid electrode G ₄ , the third grid electrode G ₃ , and the support rod 4, reducing the withstand voltage characteristics. As a means to prevent this, a getter shielding plate 11 is attached to the front opening of the fifth grid electrode _G5 to prevent the getter from scattering inward from the beam transmission hole, but this is insufficient and there is still room for improvement. It was hot.

(ハ) 考案の目的本考案は電子銃の前方に配置したゲツター容器
からの後方へのゲツター材の回り込み量を極力少
なくして耐圧低下を防止することを目的とする。(c) Purpose of the invention The purpose of the invention is to minimize the amount of getter material that wraps around to the rear from the getter container placed in front of the electron gun, thereby preventing a drop in pressure resistance.

(ニ) 考案の構成上記目的の達成手段として、本考案は電子銃前
部を支持する帯板状支持バネの中間部に幅広部を
形成したことを特徴とする。(d) Structure of the invention As a means for achieving the above object, the invention is characterized in that a wide part is formed in the middle part of the strip-shaped support spring that supports the front part of the electron gun.

この支持バネの幅広部は電子銃の先頭電極の支
持バネ取付部分を前方から見て隠す程度の大きさ
のもので、この幅広部によりゲツターフラツシユ
時に電子銃後方に回り込むゲツター材が遮蔽され
後方に飛散するゲツター材の量が大幅に減少す
る。 The wide part of this support spring is large enough to hide the part where the support spring is attached to the top electrode of the electron gun when viewed from the front, and this wide part blocks the getter material that wraps around to the rear of the electron gun during getter flash. The amount of getter material flying backwards is significantly reduced.

(ホ) 実施例第１図及び第２図の電子銃に本考案を適用し一
実施例を第４図と第５図で説明すると、第１図及
び第２図と同一符号は同一物を示し、詳細は省略
する。相異するのは電子銃前部支持用の支持バネ
１２のみで、これは第５図に示す如く中間部に幅
広部１２ｂを形成したもので、従来寸法の後端部
１２ａが第５グリツド電極G₅の外周に溶接され
てフランジ７の切欠き８から前方へ延び、従来寸
法の遊端部１２ｃがネツク部１の内面に弾圧接触
して電子銃２前部を弾圧保持する。第５グリツド
電極G₅の支持バネ導出用切欠き８の幅をd₁とす
ると、支持バネ１２の幅広部１２ｂの幅d₂はd₁と
同じか若干大きな値に設定され、且つ長さｌは電
子銃２の前方から見た時に切欠き８を十分に隠す
程度に設定される。この寸法規制によりゲツター
フラツシユ時に電子銃２の前方から後方に飛散す
るゲツター材１０の内の少くとも従来の上記切欠
き８から後方へと回り込んでいたものが幅広部１
２ｂで阻止され、その分だけ第５グリツド電極
G₅から後方に回り込むゲツター量が減少する。(E) Embodiment The present invention is applied to the electron gun shown in FIGS. 1 and 2, and an embodiment will be explained with reference to FIGS. 4 and 5. The same reference numerals as in FIGS. The details are omitted. The only difference is the support spring 12 for supporting the front part of the electron gun, which has a wide part 12b formed in the middle part as shown in FIG. The free end 12c, which is welded to the outer periphery of the G ₅ and extends forward from the notch 8 of the flange 7, has a conventional size and comes into elastic contact with the inner surface of the neck 1 to elastically hold the front part of the electron gun 2. If the width of the support spring lead-out notch 8 of the fifth grid electrode _G5 is _d1 , the width _d2 of the wide portion 12b of the support spring 12 is set to be the same as or slightly larger than _d1 , and the length l is set to such an extent that the notch 8 is sufficiently hidden when the electron gun 2 is viewed from the front. Due to this size regulation, at least the getter material 10 that is scattered from the front to the rear of the electron gun 2 during the getter flash, which would have gone around to the rear from the conventional notch 8, is reduced to the wide part 1.
2b, and the fifth grid electrode
The amount of getter that goes backwards from _G5 is reduced.

(ヘ) 考案の効果以上の構成により、電子銃の電極や支持棒にゲ
ツター材が付着する率が少なくなり、耐圧改善が
図れる。また支持バネの形状を変更するだけでい
いので実施が容易である。(f) Effects of the invention With the above configuration, the rate of getter material adhering to the electrodes and support rods of the electron gun is reduced, and the withstand voltage can be improved. Furthermore, it is easy to implement because it is only necessary to change the shape of the support spring.

[Brief explanation of drawings]

第１図及び第２図は陰極線管の要部側断面図及
びＡ−Ａ線拡大断面図、第３図は第１図における
従来の支持バネの斜視図、第４図及び第５図は本
考案の一実施例を示す陰極線管の部分断面図及び
支持バネの斜視図である。 G₅……先頭電極、２……電子銃、５……ゲツ
ター容器、１２……支持バネ、１２ｂ……幅広
部。 1 and 2 are a side sectional view and an enlarged sectional view taken along line A-A of the cathode ray tube, FIG. 3 is a perspective view of the conventional support spring in FIG. 1, and FIGS. FIG. 1 is a partial cross-sectional view of a cathode ray tube and a perspective view of a support spring, showing an embodiment of the invention. _G5 ...Top electrode, 2...Electron gun, 5...Getter container, 12...Support spring, 12b...Wide part.

Claims

[Scope of utility model registration request]

A plurality of electrodes are arranged and integrated in a straight line at predetermined intervals, a getter container is supported in front of the leading electrode, and the free end of a strip-shaped support spring is fixed to the side wall of the leading electrode with the free end facing forward. An electron gun characterized in that a wide part is provided in the middle part of a support spring.