JP2004079368A - Resistor for inside of tube, and cathode-ray tube with built-in resistor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resistor for the inside of a tube and a cathode-ray tube with a built-in resistor capable of preventing a discharge current by glow discharge from reaching an electrode for a terminal in order to solve a problem wherein, in the case of a conventional resistor for the inside of a tube such as a cathode-ray tube, glow discharge may be generated between the electrode for a terminal and a high-voltage potential point, the electrode for a terminal is broken along with the generation of the glow discharge to break an insulation coat layer, a mask block due to scattering debris of the insulation coat layer, or breakage of the resistor occurs to change a partial voltage, and thereby focus quality is degraded. <P>SOLUTION: A plurality of the electrodes 30 for terminals are formed on an insulation board 29 formed of a ceramic-based material. Resistors 35 are installed between the electrodes 30 so as to set predetermined resistance values. A through-hole 31 is bored in each electrode 30, and a grommet part 32 for a terminal piece 27 is inserted into and crimped to the through-hole 31 to catch the insulation board 29 between the crimped part 33 and a collar part 34. The relationship between the outside dimension L of the collar part 34 and the outside dimension 1 of the electrode 30 is set to satisfy L≥1. <P>COPYRIGHT: (C)2004,JPO

Description

この表１からも判るように、強制デガウサー試験では、実施品の不良発生数が０であったのに対し、比較品においては５０本中の５本についてグロー放電の継続発生が確認され、その効果が実証された。
【００３６】
一方、耐電圧処理試験については、実施品では分割比変化ΔＥが−０．４％〜＋０．２％の間で変化し、その平均としてΔＥ＝−０．１％となったのに対し、比較品では分割比変化ΔＥが−０．５％〜＋０．１％の間で変化し、その平均としてΔＥ＝−０．２％との結果が得られ、耐電圧処理試験においても実施品は比較品と比較しても遜色のない結果を得ることができ、グロー放電防止用対策を施した実施品においても、耐電圧処理の点で比較品と同程度の効果を達成していることが確認され、他の性能や特性等に悪影響を与えていないことが判明した。
【００３７】
このように、鍔部３４によって端子用電極３０を外部から隠すように構成することで、グロー放電の発生を防止することができたが、この効果をより一層向上させるために、図５に示すように、端子用電極３０よりも突出している鍔部３４の先端外周部分をかしめ部３３方向に湾曲させて、端子用電極３０の外周縁部分までも覆い隠すように構成することも可能である。
【００３８】
即ち、鍔部３４の外形寸法Ｌと端子用電極３０の外形寸法ｌとの関係をＬ＞ｌとなるように維持しつつ、鍔部３４の外周部分を端子用電極３０の外側面方向に湾曲させた構成としている。
【００３９】
このように構成することによって、端子用電極３０の外部へ露呈する殆どの部分を鍔部３４によって覆い隠すことが可能となるので、より一層確実に端子用電極３０に発生するグロー放電を抑制することができるとともに、端子片２７の固定も強固にすることが可能で、しかもこの湾曲させる作業は、はとめ部３２をかしめる際に同時に行うことが可能であり、作業工程を増加させることなく実施が可能である。
【００４０】
なお、本発明はこれら実施の形態に限定されることなく、例えば鍔部の外形寸法Ｌは最低限端子用電極の外形寸法ｌと同等の大きさとすることでもグロー放電の抑止効果が発揮され、更にグリッド電極構成が異なる電子銃構体にも適用することが可能であり、また陰極線管に限らず分圧抵抗器を内蔵するその他の電子管にも適用が可能である。
【００４１】
また、絶縁基板の形状も長方形状に限定されることなく、管内スペースに応じた方形状に形成すれば使用可能であり、更に絶縁基板のスペースファクターの観点から、抵抗体を基板の両面に形成して、その間をスルーホールピン等で電気的に接続するように構成すれば、パターン配置に余裕を持たせたり、あるいはそれだけ基板自体を小型化することが可能となる。
【００４２】
また、絶縁基板と絶縁支持体とを兼用させて形成することも可能で、更にはとめ部の形状も円形状に限らず二股の鉤状のものや四角形状等の種々の形状を採用したり、所要の複数の端子用電極に本発明を適用することも可能等、その他種々の応用や変形が可能なことはいうまでもない。
【００４３】
【発明の効果】
以上述べてきたように、本発明によれば、グロー放電による放電電流の端子用電極への流入を抑制し、端子用電極の絶縁破壊を防止することが可能となり、マスク詰まりやフォーカス不良等の発生を未然に防止することが可能な管内用抵抗器、及びこの抵抗器を内蔵した抵抗器内蔵陰極線管を得ることができるものである。
【図面の簡単な説明】
【図１】本発明に係る管内用抵抗器を内蔵した抵抗器内蔵陰極線管を示す断面図。
【図２】同じく抵抗器内蔵陰極線管の電子銃部分を示す縦断面図。
【図３】同じく抵抗器内蔵陰極線管に使用される管内用抵抗器を示す平面図。
【図４】同じく管内用抵抗器の端子用電極及び端子片部分を示す断面図。
【図５】同じく管内用抵抗器を構成する端子片の他の構成を示す断面図。
【図６】従来のカラー陰極線管を示す断面図。
【図７】同じくカラー陰極線管の電子銃部分を示す縦断面図。
【図８】同じく管内用抵抗器を示す平面図。
【図９】同じく管内用抵抗器の端子用電極及び端子片部分を示す断面図。
【符号の説明】
１１：：フェースプレート
１２：ファンネル
１３：蛍光体スクリーン
１９：ネック
２０Ｂ，２０Ｇ，２０Ｒ：電子ビーム
２１：電子銃
２４：（管内用）抵抗器
２７：端子片
２９：絶縁基板
３０：端子用電極
３１：透孔
３２：はとめ部
３３：かしめ部
３４：鍔部
３５：抵抗体
Ｇ１〜Ｇ８：グリッド電極
ＣＶ：コンバーゼンスカップ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an in-tube resistor incorporated in a color cathode ray tube or the like for supplying a divided voltage to a grid electrode, and a resistor built-in cathode ray tube incorporating the in-tube resistor.
[0002]
[Prior art]
At present, as shown in FIG. 6, a color cathode ray tube used in a general color television receiver or the like includes a face panel 61 having a substantially rectangular shape, and a funnel integrally joined to the face panel 61. A phosphor screen 63 formed of a striped or dot-shaped three-color phosphor layer that emits blue, green, and red light is formed on the inner surface of the face panel 61; Opposite to the phosphor screen 63, a shadow mask 64 having a large number of apertures formed therein is mounted.
[0003]
On the other hand, in the neck 65 of the funnel 62, there are arranged in-line type electron guns 67 which emit three electron beams 66B, 66G, 66R and are arranged in a line in the horizontal direction. The electron beams 66B, 66G and 66R are deflected by horizontal and vertical deflection magnetic fields generated by a deflection yoke 68 mounted outside the funnel 62, and horizontally and vertically scan the phosphor screen 63 via a shadow mask 64. Thus, a color image is displayed on the phosphor screen 63.
[0004]
In such a color cathode ray tube, in particular, the electron gun 67 is configured as an in-line type electron gun 67 that emits a center beam 66G passing on the same horizontal plane and a pair of side beams 66B and 66R on both sides thereof. The three electron beams 66B, 66G, and 66R are concentrated at the center of the phosphor screen 63 by decentering the positions of the side beam passage holes of the electrodes on the low-voltage side and the high-voltage side of the main lens portion of the main lens portion. By constructing the horizontal deflection magnetic field in a pincushion shape and the vertical deflection magnetic field in a barrel shape, a self-convergence type color cathode ray tube in which three electron beams 66B, 66G and 66R arranged in a line are self-concentrated over the entire screen is widely used. Has been put to practical use.
[0005]
As shown in FIG. 7, an electron gun 67 used in such a color cathode ray tube has, for example, three cathodes K arranged in a row in a horizontal direction and a heater (not shown) for heating the cathodes K. And a plurality of grid electrodes including a first grid electrode G1 to an eighth grid electrode G8 sequentially arranged in the traveling direction of the electron beams 66B, 66G, 66R from the cathode K, and a convergence cup welded to the eighth grid G8. Has a CV. These grid electrodes G1 to G8 are supported and fixed at predetermined intervals by an insulating support member 69 made of bead glass. Further, on the side surface of the electron gun 67, the inside of the tube is arranged along the longitudinal direction of the electron gun 67. A resistor 70 is provided.
[0006]
Each of the grid electrodes G1 to G8 is biased to have a predetermined potential. For example, the third grid electrode G3 and the fifth grid electrode G5 are connected in common, and a voltage provided at an intermediate portion of the resistor 70 is provided. A predetermined focus voltage is supplied from the supply terminal R1, and the fourth grid electrode G4 and the sixth grid electrode G6 are connected in common. The fourth grid electrode G4 is connected to another voltage supply provided at an intermediate portion of the resistor 70. A voltage corresponding to about 35 to 45% of the anode voltage of about 25 to 35 KV is supplied from the terminal R2, and another voltage supply terminal R3 provided at an intermediate portion of the resistor 70 is connected to the seventh grid electrode G7. A voltage corresponding to about 50 to 70% of the anode voltage is supplied via the anode voltage, and the anode voltage is directly applied to the eighth grid G8 via another voltage supply terminal R4 and the convergence cup CV. It is, by respective grid electrodes G1 to G8, electron beam 66B, 66G, are formed as a plurality of electron lenses including a main lens for focusing the 66R on the phosphor screen 63. One end of the resistor 70 is grounded via a terminal R5.
[0007]
In this way, the in-tube resistor 70 for dividing the anode voltage and supplying the required operating voltage to the grid electrode is configured as shown in FIG.
[0008]
That is, a rectangular insulating substrate 71 made of a ceramic material such as aluminum oxide is provided, and a plurality of island-shaped terminal electrodes 72 are arranged at predetermined positions of the insulating substrate 71. The electrode 72 is formed by printing, drying and firing an electrode material made of a metal oxide containing ruthenium oxide and lead borosilicate glass. As shown in FIG. 9, a through hole 73 penetrating through the insulating substrate 71 is formed at the center of the electrode 72. Further, the electrode 72 has a tongue-shaped terminal piece having a stop 74 at one end. After inserting the fitting portion 74 into the through hole 73, the fitting portion 74 is formed by caulking the fitting portion 74, and the insulating substrate 71 and the terminal electrode 72 are connected to the flange portion 77 and the caulking portion. The terminal piece 75 is fixed to the insulating substrate 71 by being attached so as to be sandwiched from both sides with the terminal board 76.
[0009]
A resistor 78 having a width and a length between the terminal electrodes 72 is provided in the terminal electrode 72 so that a predetermined resistance value is obtained between the terminal electrodes 72. The resistor 77 is made of a resistance material made of a metal oxide containing ruthenium oxide and lead borosilicate glass, and its width and length are adjusted so as to obtain a predetermined resistance value. The printing is performed by causing the printing to be performed or by changing the interval, and the printing is performed after drying. The surface of the resistor 78 and the surface of the insulating substrate 71 are covered with an insulating coating layer 79 except for the terminal electrode 72 to form the in-tube resistor 70.
[0010]
Such an in-tube resistor 70 should not affect the deflection magnetic field generated in the deflection yoke 68, and should not disturb the electric field portion of the electron gun 67 to shift the discharge or the trajectory of electrons. For this reason, the terminal piece 75 is made of non-magnetic stainless steel or the like made of an Fe—Ni—Cr alloy and has a relative magnetic permeability of 1.01 or less, preferably 1.005 or less. It is generally formed of a magnetic alloy.
[0011]
As described above, the terminal piece 75 is swaged after the fitting portion 74 is inserted into the through hole 73 of the insulating substrate 71, and the flange portion 77 and the swaging portion 76 around the fitting portion 74 of the terminal piece 75, The terminal electrode 72 is firmly held together with the insulating substrate 71 to perform electrical connection and fixation. The outer dimension L ′ of the flange 77 is set to, for example, 1.3 mm, and the outer dimension l ′ of the terminal electrode 72 is set to 1.5 mm. Therefore, the relationship between the external dimensions L ′ and l ′ is set so that L ′ <l ′, and the edge of the terminal electrode 72 is exposed to the outside from the flange 77. I have.
[0012]
[Problems to be solved by the invention]
However, in a color cathode-ray tube to which such a high voltage is applied, in order to improve the withstand voltage characteristic, after the end of the evacuation in the manufacturing process of the color cathode-ray tube, a normal operating voltage of 2% is applied. By applying a pulsed AC voltage having a peak voltage (about 60 to 70 kV) of about 3 times, forcibly discharging the grid electrode G1 constituting the electron gun 67 which causes a decrease in withstand voltage. G8 and the convergence cup CV are subjected to a withstand voltage treatment for removing burrs, deposits, and the like.
[0013]
When this high AC voltage is applied, the terminal electrode disposed on the insulating substrate 71 which easily emits secondary electrons and the terminal electrode used to prevent discharge in the tube, for example, are insulated at the position of the fifth grid electrode G5. An electric field is generated between a metal ring (not shown) called a suppressor ring (not shown) wound around the support 69 or an AC voltage source and the low voltage side of the resistor 70, thereby causing a glow discharge. May occur. At this time, since a resistance component exists between the flange portion 77 and the terminal electrode 72, charges are concentrated on the peripheral portion of the terminal electrode 72. This glow discharge passes through the upper portion of the insulating film layer 79 to reach the peripheral portion of the terminal electrode 72 where charges are concentrated, so that a discharge current flows into the terminal electrode 72 in the insulating film layer 78, The dielectric breakdown of the terminal electrode 72 was caused. Simultaneously with the occurrence of the dielectric breakdown, the insulating coating layer 79 disposed close to the terminal electrode 72 is also destroyed, and the splash of the insulating coating layer 79 is scattered in the tube, and the scattered splash is applied to the aperture of the shadow mask 64. And the shadow mask 64 is clogged. Further, the resistor 78 connected to the terminal electrode 72 may be broken by this dielectric breakdown. In the worst case, the resistor 78 is disconnected.
[0014]
As described above, when the shadow mask 64 is clogged with the mask or the resistor 78 is disconnected, the color cathode ray tube becomes defective and cannot be shipped as a product anymore. Further, even if the disconnection of the resistor 78 or the disconnection of the resistor 78 is avoided, an excessive current flows through the resistor 78 due to the occurrence of the glow discharge, and the resistor 78 is damaged or damaged. There is a problem that a predetermined divided voltage cannot be obtained, which leads to poor focus of the electron gun 67.
[0015]
The present invention has been made in view of such a problem, by setting the outer dimensions of the flange portion of the terminal piece disposed on the terminal electrode to be equal to or greater than the outer dimensions of the terminal electrode, An object of the present invention is to provide an in-tube resistor and a cathode ray tube with a built-in resistor that can prevent a discharge current from flowing into a terminal electrode by glow discharge and prevent dielectric breakdown of the electrode terminal.
[0016]
[Means for Solving the Problems]
The present invention relates to a rectangular insulating substrate formed of a ceramic material, a resistor disposed on the insulating substrate to obtain a predetermined resistance value, and one end connected to the resistor and formed in an island shape. In a tube resistor having a plurality of terminal electrodes, and a plurality of terminal pieces that are fixed to the flange portion and the fitting portion through the insulating substrate so as to be electrically connected to the terminal electrode. The outer diameter L of at least one terminal piece is set to a relation of L ≧ 1 with respect to the outer diameter l of the terminal electrode to constitute a tube resistor.
[0017]
Also, a substantially rectangular face panel, a funnel-shaped funnel connected to the face panel, a phosphor screen formed on the inner surface of the face panel, and an electron beam formed in the neck of the funnel and formed on the phosphor screen An electron gun having a plurality of grid electrodes to be focused on, a rectangular insulating substrate formed of a ceramic material arranged in a neck in parallel with the electron gun, and a predetermined resistance value on the insulating substrate. A resistor disposed so as to obtain, a plurality of terminal electrodes connected to the resistor and having one end formed in an island shape, and penetrating the insulating substrate so as to be electrically connected to the terminal electrodes. In a resistor built-in cathode ray tube having a built-in resistor having a plurality of terminal pieces fixed with a flange and a stopper, the flange outer dimension L of at least one terminal piece is set to To form dimensions l, it is obtained by constituting the resistors built cathode ray tube is set to the relationship of L ≧ l.
[0018]
With this configuration, it is possible to prevent the discharge current due to the glow discharge from flowing into the terminal electrode when the glow discharge occurs, to prevent the dielectric breakdown of the terminal electrode, and to maintain good characteristics. It has become possible to obtain the in-tube resistor and the cathode ray tube with a built-in resistor.
[0019]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0020]
The in-tube resistor and the color cathode ray tube incorporating the resistor according to the present invention are configured as shown in FIG.
[0021]
That is, the face panel 11 has a substantially rectangular shape, and a funnel-shaped funnel 12 integrally joined to the face panel 11 has an envelope. The inner surface of the face panel 11 has blue, green, and red. A phosphor screen 13 composed of a stripe-shaped or dot-shaped three-color phosphor layer that emits light is formed, and a shadow mask 14 having a large number of apertures formed inside thereof is opposed to the phosphor screen 13 by a mask frame. The mask frame 15 is attached to the inside of the face panel 11 via an elastic support 16 and stud pins 17, and a magnetic shield plate 18 is attached to the mask frame 15.
[0022]
On the other hand, in the neck 19 of the funnel 12, there are arranged in-line type electron guns 21 which emit three electron beams 20B, 20G and 20R and are arranged in a line in the horizontal direction. The electron beams 20B, 20G, and 20R are deflected by horizontal and vertical deflection magnetic fields generated by a deflection yoke 22 mounted outside the funnel 12, and horizontally and vertically scan the phosphor screen 13 via a shadow mask 14. It is configured to display a color image on the phosphor screen 13.
[0023]
In such a color cathode ray tube, in particular, the electron gun 21 is configured as an in-line type electron gun 21 that emits a center beam 20G passing on the same horizontal plane and a pair of side beams 20B and 20R on both sides thereof. The three electron beams 20B, 20G, and 20R are concentrated at the center of the phosphor screen 13 by eccentricizing the positions of the side beam passage holes of the electrodes on the low-voltage side and the high-voltage side of the main lens portion 21. By forming the generated horizontal deflection magnetic field in a pincushion shape and the vertical deflection magnetic field in a barrel shape, a self-convergence type color cathode ray tube is formed.
[0024]
As shown in FIG. 2, the electron gun 21 has three cathodes K arranged in a row in a horizontal direction, a heater (not shown) for heating the cathodes K, and electron beams 20B, 20G, A plurality of grid electrodes including a first grid electrode G1 to an eighth grid electrode G8 which are sequentially and coaxially arranged in common in the traveling direction of 20R, and a convergence cup CV welded to the eighth grid electrode G8; The cathode K and each of the grid electrodes G1 to G8 are supported and fixed at predetermined intervals between the insulating supports 23 by a pair of insulating supports 23 made of bead glass. An in-tube resistor 24 is provided along the longitudinal direction of the insulating support 23, and an anode voltage is supplied to a high voltage side of the resistor 24.
[0025]
The third grid electrode G3 and the fifth grid electrode G5 are commonly connected, and the convergence cup CV is fixed to the eighth grid electrode G8 by welding, and is electrically connected. A conductive spring 25 is attached to the convergence cup CV. The conductive spring 25 resiliently contacts a graphite conductive film 26 attached to the inner wall of the tube to which the anode voltage is supplied. The anode voltage is supplied to the convergence cup CV and the eighth grid electrode G8, and is also supplied to one end of the resistor 24 via the terminal strip 27. The anode voltage supplied to the resistor 24 is divided by the resistance of the resistor 24, and a divided voltage is taken out from each terminal strip 27 to obtain a seventh grid electrode G7, a sixth grid electrode G6, and a fifth grid electrode G5. The terminal piece 27 for leading to the ground pin 28 is provided at the other end of the resistor 24.
[0026]
Such an in-pipe resistor 24 is configured as shown in FIG.
[0027]
That is, a rectangular insulating substrate 29 made of a ceramic material such as aluminum oxide is provided, and an island-shaped terminal electrode 30 is arranged at a predetermined position of the insulating substrate 29. The terminal electrode 30 is printed by a screen method using a low-resistance paste material having a sheet resistance value of 10 kΩ / □ made of a metal oxide containing ruthenium oxide and lead borosilicate glass, dried, and fired. It is formed. As shown in FIG. 4, a through hole 31 penetrating through the insulating substrate 29 is formed at the center of the terminal electrode 30, and the terminal electrode 30 has a tongue having a stopper 32 at one end. A terminal piece 27 made of a flaky stainless steel material or a metal steel material with a chromium oxide film or the like forms a caulked portion 33 by caulking the clasp 32 after inserting the clasp 32 into the through-hole 31. The caulking portion 33 and the flange portion 34 around the clasp portion 32 hold and electrically connect the insulating substrate 29 including the terminal electrode 30 by sandwiching the same.
[0028]
The terminal electrode 30 is provided with a resistor 35 in which the length and width between the terminal electrodes 30 are set to predetermined values so that a predetermined resistance value is obtained between the terminal electrodes 30. The resistor 35 is made of a high-resistance paste material having a sheet resistance of 5 MΩ / □ made of a metal oxide containing ruthenium oxide and lead borosilicate glass and having a predetermined resistance of 0.1 × 10 ⁹ to 2 In order to obtain 0.0 × 10 ⁹ Ω, it is formed by printing by a screen method by meandering the length and width or changing the interval, and then drying and firing. The surface of the resistor 35 and the surface of the insulating substrate 29 are insulated by printing, drying and firing an insulating member mainly composed of a transition metal oxide and lead borosilicate except for the terminal electrode 30 by a screen method. A coating layer 36 is formed, and the entire surface of the resistor 35 and the insulating substrate 29 excluding the terminal electrode 30 is covered with the insulating coating layer 36 to constitute the in-tube resistor 24.
[0029]
The distance between the terminal electrode 30 and the insulating coating layer 36 may be set to be equal at the entire outer periphery of the island-shaped terminal electrode 30 or may be set at a low voltage side where the probability of discharge is low. Can be set to be narrow or unbalanced so as to be zero.
[0030]
When the resistor 24 is configured as described above and, for example, the outer dimension of the flange 34 of the terminal strip 27 to which the seventh grid electrode G7 is connected is L and the outer dimension of the corresponding terminal electrode 30 is l, Are set to L> l. The outer dimension L of the flange portion 34 is set to, for example, 1.3 mm, and the outer dimension 1 of the terminal electrode 30 is set to 0.8 mm. Therefore, the flange 34 protrudes from the outer periphery of the terminal electrode 30 in the plane direction of the insulating substrate 29 and is arranged so as to cover the terminal electrode 30.
[0031]
As described above, by setting the outer dimensions L and l to L> l, the terminal electrode 30 is covered by the flange portion 34, and the peripheral edge of the terminal electrode 30 is not exposed to the outside. Therefore, even if a glow discharge is to be generated between the terminal electrode 30 and the high voltage potential point, since the flange portion 34 protrudes outside the terminal electrode 30, even if the glow discharge occurs, the terminal electrode 30 is not pressed. , Secondary electron emission becomes difficult, and the discharge current flows to the side of the flange portion 34 arranged closer to the higher voltage potential point, and does not directly flow into the terminal electrode 30. Therefore, it is possible to prevent the terminal electrode 30 from being broken by the discharge current of the glow discharge, and to prevent the insulating coating layer 36 from being damaged.
[0032]
Therefore, the occurrence of the splash of the splash due to the damage of the insulating coating layer 36 is prevented, so that the mask clogging of the shadow mask 14 can be eliminated. Furthermore, it is possible to cover the edge of the terminal electrode 27 which is the base point of the glow discharge, suppress the glow discharge caused by the resistor, eliminate the damage to the resistor 35 due to the glow discharge current, and improve the focus defect. And the disadvantages such as disconnection of the resistor 35 can be improved.
[0033]
In order to verify such an effect, a cathode ray tube (embodiment) having a built-in tube resistor according to the present embodiment and a cathode ray tube (comparative product) having a built-in tube resistor of a conventional configuration are used. A forced degausser test was performed for comparison.
[0034]
The forced degausser test is a test in which a strong magnetic field is forcibly applied to the electron gun from outside the cathode ray tube to intentionally cause a glow discharge to be performed, and the test is determined to be good if the glow discharge is terminated. If the glow discharge continues to occur, it is determined to be defective.
[0035]
In addition, with respect to the withstand voltage treatment, a withstand voltage treatment test was performed in which a change in resistance division ratio before and after the treatment was measured. As a result of performing the forced degausser test and the withstand voltage treatment test on 50 samples of the implemented product and the comparative product, the results shown in Table 1 were obtained.
[Table 1]

As can be seen from Table 1, in the forced degausser test, the number of defective occurrences in the test product was 0, whereas in the comparative product, continuous generation of glow discharge was confirmed in 5 out of 50 test products. The effect has been demonstrated.
[0036]
On the other hand, in the withstand voltage test, in the embodiment, the division ratio change ΔE changed between −0.4% and + 0.2%, and the average was ΔE = −0.1%. In the comparative product, the division ratio change ΔE changes between -0.5% to + 0.1%, and the average value is obtained as ΔE = -0.2%. Comparable results can be obtained even when compared with the comparative product, and the effect of the withstand voltage treatment can be achieved on the same level as that of the comparative product even in the case of the glow discharge prevention measures. It was confirmed that it did not adversely affect other performances and characteristics.
[0037]
As described above, by forming the terminal electrode 30 from the outside by the flange portion 34, it was possible to prevent the occurrence of glow discharge. However, in order to further improve this effect, FIG. In this manner, the outer peripheral portion of the distal end of the flange portion 34 protruding from the terminal electrode 30 may be curved in the direction of the caulking portion 33 so as to cover even the outer peripheral edge portion of the terminal electrode 30. .
[0038]
That is, while maintaining the relationship between the outer dimension L of the flange 34 and the outer dimension 1 of the terminal electrode 30 such that L> l, the outer peripheral portion of the flange 34 is curved toward the outer surface of the terminal electrode 30. It is configured to be
[0039]
With this configuration, it is possible to cover most of the portion of the terminal electrode 30 that is exposed to the outside with the flange portion 34, so that the glow discharge generated in the terminal electrode 30 is more reliably suppressed. In addition to this, the fixing of the terminal piece 27 can be firmly performed, and the bending operation can be performed simultaneously when the fitting portion 32 is swaged, without increasing the number of working steps. Implementation is possible.
[0040]
The present invention is not limited to these embodiments. For example, even if the outer dimension L of the flange is at least as large as the outer dimension l of the terminal electrode, the effect of suppressing glow discharge is exhibited. Furthermore, the present invention can be applied to an electron gun assembly having a different grid electrode configuration, and can be applied not only to a cathode ray tube but also to other electron tubes having a built-in voltage-dividing resistor.
[0041]
Also, the shape of the insulating substrate is not limited to a rectangular shape, but can be used if it is formed in a square shape according to the space in the tube. Further, from the viewpoint of the space factor of the insulating substrate, resistors are formed on both sides of the substrate. If such a configuration is made so as to be electrically connected between the holes by a through-hole pin or the like, it is possible to allow a margin for the pattern arrangement or to reduce the size of the substrate itself.
[0042]
Further, it is also possible to form the insulating substrate and the insulating support member together, and it is also possible to adopt not only a circular shape but also various shapes such as a bifurcated hook shape and a square shape. Needless to say, the present invention can be applied to a plurality of required terminal electrodes, and various other applications and modifications are possible.
[0043]
【The invention's effect】
As described above, according to the present invention, it is possible to suppress the inflow of the discharge current due to the glow discharge into the terminal electrode, to prevent the dielectric breakdown of the terminal electrode, and to prevent clogging of the mask and poor focus. It is possible to obtain an in-tube resistor capable of preventing the occurrence thereof beforehand, and a resistor built-in cathode ray tube incorporating this resistor.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a cathode ray tube with a built-in resistor incorporating a tube resistor according to the present invention.
FIG. 2 is a longitudinal sectional view showing an electron gun portion of the cathode ray tube with a built-in resistor.
FIG. 3 is a plan view showing an in-tube resistor similarly used in a cathode ray tube with a built-in resistor.
FIG. 4 is a sectional view showing a terminal electrode and a terminal piece of the in-tube resistor.
FIG. 5 is a cross-sectional view showing another configuration of the terminal piece that similarly configures the in-pipe resistor.
FIG. 6 is a sectional view showing a conventional color cathode ray tube.
FIG. 7 is a longitudinal sectional view showing an electron gun portion of the color cathode ray tube.
FIG. 8 is a plan view showing the in-pipe resistor.
FIG. 9 is a sectional view showing a terminal electrode and a terminal piece of the in-tube resistor.
[Explanation of symbols]
11: face plate 12: funnel 13: phosphor screen 19: neck 20B, 20G, 20R: electron beam 21: electron gun 24: resistor 27 (for tube) resistor 27: terminal strip 29: insulating substrate 30: terminal electrode 31 : Through hole 32: Clamping part 33: Caulking part 34: Flange part 35: Resistors G1 to G8: Grid electrode CV: Convergence cup

Claims (4)

A rectangular insulating substrate formed of a ceramic material,
A resistor disposed on the insulating substrate so as to obtain a predetermined resistance value;
A plurality of terminal electrodes connected to the resistor and having one end formed in an island shape,
An in-pipe resistor having a plurality of terminal pieces that are fixed to the flange portion and the fitting portion through the insulating substrate so as to be electrically connected to the terminal electrode,
An in-pipe resistor, wherein a flange outer dimension L of the at least one terminal piece is set to a relationship of L ≧ 1 with respect to an outer dimension l of the terminal electrode. 2. The in-tube resistor according to claim 1, wherein a flange portion of the terminal piece extends to an outer periphery of the terminal electrode. A substantially rectangular face panel,
A funnel-shaped funnel connected to this face panel,
A phosphor screen formed on the inner surface of the face panel,
An electron gun having a plurality of grid electrodes arranged in the neck of the funnel to form an electron beam and focus on the phosphor screen;
A rectangular insulating substrate formed of a ceramic material and arranged in the neck in parallel with the electron gun;
A resistor disposed on the insulating substrate so as to obtain a predetermined resistance value;
A plurality of terminal electrodes connected to the resistor and having one end formed in an island shape,
In a resistor built-in cathode ray tube incorporating a resistor having a plurality of terminal pieces that are fixed to the flange portion and the fitting portion through the insulating substrate so as to be electrically connected to the terminal electrode,
A cathode ray tube with a built-in resistor, wherein an outer dimension L of the flange portion of the at least one terminal piece is set to a relation of L ≧ 1 with respect to an outer dimension 1 of the terminal electrode. 4. The cathode ray tube with a built-in resistor according to claim 3, wherein a flange portion of the terminal piece extends to an outer periphery of the terminal electrode.

Images