WO1994016457A1 - Electron gun for color image receiving tube - Google Patents

Electron gun for color image receiving tube Download PDF

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Publication number
WO1994016457A1
WO1994016457A1 PCT/KR1993/000118 KR9300118W WO9416457A1 WO 1994016457 A1 WO1994016457 A1 WO 1994016457A1 KR 9300118 W KR9300118 W KR 9300118W WO 9416457 A1 WO9416457 A1 WO 9416457A1
Authority
WO
WIPO (PCT)
Prior art keywords
electron gun
electrode
electron beam
electron
focusing
Prior art date
Application number
PCT/KR1993/000118
Other languages
English (en)
French (fr)
Inventor
Kyung Ho Kim
Original Assignee
Orion Electric Company Ltd.
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 Orion Electric Company Ltd. filed Critical Orion Electric Company Ltd.
Priority to US08/295,719 priority Critical patent/US5654612A/en
Priority to EP94903111A priority patent/EP0628983A4/en
Publication of WO1994016457A1 publication Critical patent/WO1994016457A1/ja

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
    • H01J29/46—Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement
    • H01J29/48—Electron guns
    • 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
    • H01J29/62—Electrostatic lenses
    • H01J29/626—Electrostatic lenses producing fields exhibiting periodic axial symmetry, e.g. multipolar fields
    • H01J29/628—Electrostatic lenses producing fields exhibiting periodic axial symmetry, e.g. multipolar fields co-operating with or closely associated to an electron gun

Definitions

  • the present invention relates to an electron gun structure for a color picture tube, in particular, when the electron gun is operated, a difference between the center of each electron beam passing through the main lens and a non-uniform magnetic field such as a deflection yoke.
  • the present invention relates to an electron gun which prevents the deterioration of the focus characteristic of a picture tube due to the difference in electron beam caused by the electron beam.
  • a color picture tube consists of a panel 11 coated with a fluorescent film 12 and a funnel 13 connected to the rear part, as shown in Fig. 1.
  • An electron gun 8 that emits light and a shadow mask 14 that plays a role of color selection are installed, and a deflection yoke 15 for deflecting the electron beam is provided outside the funnel 13.
  • the above-mentioned electron gun 8 has a cathode electrode which is heated by a heater, a control electrode, a screen electrode, a focus electrode, and an anode electrode which are successively formed after the force electrode.
  • the electrodes are arranged in an E-line while maintaining a certain distance from each other, and the bead or bead glass is a perfect support for the electrodes.
  • Each electrode is provided with three electron beam passage holes.
  • At least two electrostatic lenses are always formed in the electron gun.
  • One is a pre-focus lens formed by the potential difference between the applied voltage of the screen electrode and the applied voltage of the focus electrode. -focus lense), and the other is between the applied voltage of the focus electrode and the applied electrode of the anode electrode.
  • the pre-focus lens serves to prevent the diffusion of the electron beam incident on the main lens, and the main lens described above screens the electron beam. At this time, if the center axis of the electron beam and the center axis of the main lens do not exactly coincide with each other, the spot of the electron beam formed on the screen will be closed. (Hal o) is generated and causes the resolution of the color picture tube to decrease.
  • the second field is a perspective garden of the focus electrode applied to the conventional electron gun, and three electron beam passage holes a, b, and c are arranged in the electrode body 1 at regular intervals.
  • the electron beam passage holes between the focus electrode and the end electrode are shifted from each other, and both outer electron beams are concentrated on the screen. Due to distortion, when the outer and outer electron beams pass through the main lens, a difference occurs and the focus characteristic is degraded. It is possible to prevent the generation of the difference due to the deviation of the center of the through hole and the reduction of the focus characteristic of the electron gun due to the difference of the electron beam due to the non-uniform magnetic field such as the deflection torque. Its purpose is to provide an electron gun for a color picture tube.
  • the electron gun for a color picture tube matches the central axis of the through-beam passage hole of the focus electrode and the source electrode, and the electron gun extends over the entire rich surface.
  • the additional electrode member is placed between the electron beam path of the focusing electrode to improve the focusing properties of the beam and thereby focus the electron beam on the screen. Is installed almost parallel to the above-mentioned electron beam path to supply a voltage higher than the voltage applied to the force electrode.
  • No. 1 is a side field of a general color picture tube.
  • Figure 2 is a perspective view of the conventional focus electrode.
  • Third is a perspective view of the focus electrode according to the present invention.
  • Fig. 4 shows the distribution of the electric field formed at the A-A line section of the third field.
  • Section 5A shows the cross-section of the electron beam as it passes through the main lens section.
  • Fig. 5B shows the cross-section of the electronic beam as it passes through the main lens according to the present invention.
  • a focusing groove 3 is formed in the focusing electrode body 1 of the electron gun almost parallel to the passage of the electron beam in order to improve the focusing characteristics of the electron beam. Then, the additional electrode members 31 and 32 made of thin flat plates are inserted into the respective focusing grooves 3.
  • the two focusing grooves 3 may be formed on one surface, and may be formed on either or both of the upper and lower surfaces of the electrode body.
  • the invention is not limited to the insertion of the electrode members 31 and 32, nor is it limited to the installation only on the force electrodes.
  • the additional electrode members 31 and 32 are preferably thin rectangular flat plates having a constant aspect ratio, but may be modified in various other forms. Each additional electrode member 31, 32 Is applied with the same voltage Va, which is higher than the voltage Vb applied to the force electrode boat 1.
  • the electron beam is affected by the electric field formed around the force electrode as shown in Fig. 4.
  • astigmatism is generated in the electron beam due to the quadrupole lens effect of the electrode, and the electron beam moves by receiving a force in the direction of the center electron beam.
  • the astigmatic difference due to the above-mentioned electrode is offset by the astigmatic difference generated by a non-uniform magnetic field such as a deflection shock, and the focusing characteristic can be remarkably improved also around the screen. .
  • the focusing and forcing characteristics are improved because the electric beam is focused before passing through the main lens portion, and the electron beam is formed by the deflection stroke using the plate electrode. It can correct the deflection astigmatic error of the camera and improve the focusing characteristics of the electron gun of the color picture tube.

Landscapes

  • Video Image Reproduction Devices For Color Tv Systems (AREA)
  • Cathode-Ray Tubes And Fluorescent Screens For Display (AREA)

Description

明 細 書 カラ-受像管用電子銃 技術分野
本發明はカラ-受像管用電子銃構體に係わり.特に電子銃の作動時， 主レンズの各電子ビ-ム通過 中心の偏差による收差發生と，偏向ヨ-ク のような非齊ー磁界による電子ビ-ムの收差による受像管のフォ -カス 特性の低下を防止するようにした電子銃に關するものである.
背景技術
一般的にカラ-受像管は第 1圔に示すように，螢光膜 12が塗布された パネル 11とその後部に結合されるファンネル 13からなされる.前記受 像管の内部には直接熱電子を放出する電子銃 8と色選別の役割をする シャドウマスク 14が設置される.フアンネル 13の外側には電子ビ-ムを 偏向させるための偏向ョ-ク 15が設けられる.
前記の電子銃 8はヒ-タによつて加熱作動するカソ-ド電極と，この力 ソ-ド電極に次いで績いて順次 S笸された制御電極，スクリ-ン電極，フ ォカス電極，アン-ド電極およびコンパ-ゼンス電極から構成ている. 前記の各電極は互いに一定間隔を維持しつつ E列されており，棒，ま たは扳狀の絶緣支持體であるピ-ドグラス（Bead Glass )によって固定 される.また，前記の各電極にはそれぞれ 3個の電子ビ-ム通過孔が設け られる.
また，電子銃には常に少なく とも 2個の靜電レンズが形成され，一つ はスクリ-ン電極の印加電厘とフォ-カス電極の印加電壓の間の電位差 によって形成されるプリフォ -カスレンズ（ Pre- focus lense )であり， もう一つはフォーカス電極の印加電厘とァゾ-ド電極の印加電廑の間 の電位差によって形成される主レンズである.前記のプリフォ -カスレ ンズは主レンズへ入射する電子ビ-ムの擴散を防止させる役割をし，前 記の主レンズは電子ビ-ムをスクリ-ン上に集束させる役割を行う. この時，電子ビ-ムの進行中心軸と主レンズの中心軸が正確に一致し なければ，スクリ-ンに形成される電子ビ-ムのスポヅトにハ口- ( Hal o ) が發生しカラ -受像管の解像度を低下させる原因となる.
第 2圃は從來の電子銃に適用されるフォ-カス電極の斜視園であって 電極胴體 1に 3個の電子ビ-ム通過孔 a, bおよび cが一定閩隔に竝んで E 列されていて，フォカス電極とアン-ド電極との電子ビ-ム通過孔をず れるようにし，兩外側電子ビ-ムをスクリ-ン上に集中させる.このため に從來の電子銃は主レンズの歪みができるため，兩外側の電子ビ-ムが 主レン-ズを通過するとき收差が發生し，フォ-カス特性が低下される. したがって，本發明は主レンズ部の各電子ビ-ム通過孔中心の偏差に よる收差の發生と，偏向ョ-クのような非齊一磁界による電子ビ-ムの 收差による電子銃のフォ-カス特性が低下することを防止することの できるカラ-受像管用電子銃を提供するのにその目的がある.
發明の開示
上述した目的を達成するための本發明のカラ -受像管用電子銃はフ ォ -カス電極とァソ-ド電極の電于ビ-ム通過孔の中心軸とを一致させ， 全富面にわたって電子ビ-ムのフォ -カシング特性を向上させ，それに よって電子ビ-ムがスクリ-ン上に良好に集束されるように，付加電極 部材をフォ-力ス電極の電子ビ-ム經路の間に前記の電子ピ-ム經路と ほとんど平行に K設し，フォ-力ス電極に印加される電壓ょり高い電壓 を供給する.
圃面の簡單な説明
第 1圆は一般的なカラ-受像管の側面圃である. 第 2圖は從來のフォ-カス電極の斜視圖である.
第 3圇は本發明によるフォ-カス電極の斜視圇である.
第 4圖は第 3圃の A- A線斷面部位に形成された電界分布阖.
第 5A圇は從來の主レンズ部を通過する時の電子ビ-ムの斷面形態を 圔示する.
第 5B圖は本發明による主レンズ部を通過する時の電子ビ-ムの斷面 形態を圃示する. 發明を實施するための最良の形態
以下，本發明の實施例が添附された圇面を參照して詳細に説明する ことにする.
本發明の實施例はセパレ-トタイプの電子銃に適用するように構成 されたものの，本發明は他の種類の電子銃にも適用することができる. 第 3圃は本發明によるフォ-力ス電極の斜視圃であって，電子ビ-ムの フォ-カシング特性を向上させるために電子銃のフォ-カス電極胴體 1 にフォ-カシング溝 3を電子ビ-ム通過經路とほとんど平行に形成し，薄 い平板でできたて付加電極部材 31 , 32をそれぞれのフォ-カシング溝 3 に挿入する.
前記のフォ-カシング溝 3は一面に 2個形成し，電極胴體の上面および 下面の兩側やいずれかの一側に形成のしてもよい.また，本發明はフォ -カシング溝 4によって付加電極部材 31 , 32を挿入することに限定され ておらず，またフォ -力ス電極にのみ設置することに限定ざれてにな い.
前記の付加電極部材 31 , 32は一定な縦横比を持つ正四角形の薄い平 板が好ましいが，その他にもいろいろ形態に變形することができる.前 記のフォ-カジン #( 3 )に挿入されるそれぞれの付加電極部材 31 , 32 には同一電壓 Vaを印加し，この電壓 Vaはフォ-力ス電極胴艘 1に印加さ れる電廛 Vbより高い.
したがって，電子銃が動作すると，電子ビ-ムは第 4阖に圃示されたよ うに，フォ -力ス電極の周圍に形成された電界の影響を受けることにな る.
すなわち，前記の電極による四極子レンズ效果により電子ビ-ムに非 点收差が發生され，中央側電子ビ-ムの向きへ力を受けて移動すること になる.
したがって，兩外側の電子ビ-ムが主レンズ部を通過する以前から集 れるため.主レンズ部を通過するときの發生される收差による電子ピ- ムの断面形態を第 5A圔に示された從來の電子ビ-ムの形狀ょり第 5B圖 に示されたように收差の小い電子ビ-ムが得られる.
また，前記の電極による非点收差は偏向ョ-クのような非齊一磁界に より發生された非点收差と相殺され，スクリ-ン周邊部にもフォ-カス 特性を著しく改善出来る.
したがって，部加電極部材 31， 32にダイナミックフォ -力ス電壓を印 加し，スクリ-ン全面にわたってフォ-カス特性を著しく改善ざれて，從 來の電子銃に比し格段に鮮明な映像を生ずる解像度に優れたインライ ン型電子銃構體が得られる.
産業上の利用可能性
上述したように本發明は電于ピ -ムが主レンズ部を通過する以前か ら集束されるため集束およびフォ-力ス特性が向上し，板狀電極を使用 し偏向ョ-クによる電子ピ-ムの偏向非点收差誤差を補正し，カラ-受像 管の電子銃のフォ-カシング特性を向上させることができる.

Claims

請求の範圍
1.多數の電極から構成されるカラ-受像管用インライン型電子銃にお いて，フォ-カス電極の電子ビ-ムの通過經路と經路との間に前記の 電子ビ-ム經路とほとんど平行に付加電極部材 31 , 32が配設されてい ることを特徴さするカラ-受像管用電子銃.
PCT/KR1993/000118 1992-12-31 1993-12-28 Electron gun for color image receiving tube WO1994016457A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US08/295,719 US5654612A (en) 1992-12-31 1993-12-28 Electron gun assembly adapted for a color image receiving tube
EP94903111A EP0628983A4 (en) 1992-12-31 1993-12-28 ELECTRON CANON FOR COLOR IMAGE RECEIVER TUBE.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR92028105U KR950003539Y1 (ko) 1992-12-31 1992-12-31 칼라수상관용 전자총
KR1992/28105U 1992-12-31

Publications (1)

Publication Number Publication Date
WO1994016457A1 true WO1994016457A1 (en) 1994-07-21

Family

ID=19349007

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR1993/000118 WO1994016457A1 (en) 1992-12-31 1993-12-28 Electron gun for color image receiving tube

Country Status (3)

Country Link
US (1) US5654612A (ja)
KR (1) KR950003539Y1 (ja)
WO (1) WO1994016457A1 (ja)

Citations (4)

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JPS4823854B1 (ja) * 1968-12-25 1973-07-17
JPS5292473A (en) * 1976-01-30 1977-08-03 Mitsubishi Electric Corp Main lens electric field forming method of inline type 3 beam electron gun
JPS59139535A (ja) * 1983-01-31 1984-08-10 Hitachi Ltd カラ−ブラウン管用電子銃
JPS62237641A (ja) * 1986-04-08 1987-10-17 Mitsubishi Electric Corp インライン形電子銃

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US4086513A (en) * 1975-03-03 1978-04-25 Rca Corporation Plural gun cathode ray tube having parallel plates adjacent grid apertures
US4208610A (en) * 1978-06-09 1980-06-17 Zenith Radio Corporation Television picture tubes having an electron gun with aperture electrode shielding means
US4374342A (en) * 1980-10-15 1983-02-15 North American Philips Consumer Electronics Corp. Focusing means in a unitized bi-potential CRT electron gun assembly
JPH0719541B2 (ja) * 1985-04-30 1995-03-06 株式会社日立製作所 インライン型カラー受像管
JPS61288352A (ja) * 1985-06-14 1986-12-18 Hitachi Ltd インライン型電子銃
DE3775253D1 (de) * 1986-04-03 1992-01-30 Mitsubishi Electric Corp Kathodenstrahlroehre.
DE69017350T2 (de) * 1989-10-25 1995-07-13 Toshiba Kawasaki Kk Farbbildkathodenstrahlröhre.
JPH03205744A (ja) * 1989-10-30 1991-09-09 Matsushita Electron Corp シャドウマスク型カラー受像管
KR930011058B1 (ko) * 1991-02-12 1993-11-20 삼성전관 주식회사 칼라 음극선관용 다단집속형 전자총
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Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4823854B1 (ja) * 1968-12-25 1973-07-17
JPS5292473A (en) * 1976-01-30 1977-08-03 Mitsubishi Electric Corp Main lens electric field forming method of inline type 3 beam electron gun
JPS59139535A (ja) * 1983-01-31 1984-08-10 Hitachi Ltd カラ−ブラウン管用電子銃
JPS62237641A (ja) * 1986-04-08 1987-10-17 Mitsubishi Electric Corp インライン形電子銃

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP0628983A4 *

Also Published As

Publication number Publication date
US5654612A (en) 1997-08-05
KR940017779U (ko) 1994-07-28
KR950003539Y1 (ko) 1995-05-03

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