JP2646578B2 - Built-in cathode ray tube low resistance - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Industrial Fields B Overview of the Invention C Prior Art D Problems to be Solved by the Invention E Means for Solving the Problems F Operation G Example G-1 First Example (FIG. 1, (Fig. 2) G-2 CRT using the first embodiment (third and fourth cathode ray tubes)
FIG. G-3 Second Embodiment (FIG. 5) H Effect of the Invention A Industrial Field of the Invention The present invention relates to a built-in resistor incorporated in a tube such as a color cathode ray tube together with an electron gun assembly.

B SUMMARY OF THE INVENTION The present invention relates to a cathode ray tube which is incorporated together with an electron gun assembly in a cathode ray tube and supplies an intermediate voltage obtained by dividing a high voltage such as an anode voltage in the cathode ray tube to a part of the electron gun assembly. In the internal resistor, a resistor layer having a predetermined pattern is provided between the low-voltage electrode terminal and the intermediate-voltage electrode terminal and between the intermediate-voltage electrode terminal and the high-voltage electrode terminal on the rectangular insulating substrate. An insulating coating covering these resistor layers is provided on the rectangular insulating substrate, and the low-voltage electrode terminal is disposed at a position facing one of a pair of opposed short side edges of the rectangular insulating substrate. The high-voltage part electrode terminal and the intermediate voltage part electrode terminal are respectively disposed at positions facing the pair of opposed long side edges of the rectangular insulating substrate between the pair of short side edges. Electrode terminals The direction in which each of a pair of long side edges of the rectangular insulating substrate extends in the neck portion of the cathode ray tube is located between the voltage electrode terminal and the intermediate voltage portion electrode terminal. Direction, and the low-voltage electrode terminals are positioned at the end of the neck and incorporated. The tube inner wall conductive layer is disposed so as not to be closely opposed to the tube inner wall conductive layer, and a proper insulation state is maintained between the intermediate voltage portion electrode terminal and the tube inner wall conductive layer.

C Conventional Technology Conventionally, some color cathode ray tubes and the like used in color television receivers require a high voltage to be supplied to, for example, a convergence electrode or a focus electrode, in addition to the anode voltage. In such a case, it has been proposed to incorporate a resistor for voltage division together with the electron gun structure in the tube as a built-in resistor, thereby dividing the anode voltage to obtain the respective high voltages. As an example of a conventional built-in resistor to be used, the one shown in FIGS. 6 and 7 is known.

FIG. 6 shows the conventional built-in resistor 7 seen through from the insulating film forming the outer surface, and FIG. 7 shows the entire side face of the conventional built-in resistor 7. In the built-in resistor 7 shown in FIGS. 6 and 7, an electrode terminal portion formed by applying a conductive layer on an insulating substrate 1 such as a ceramic plate formed in a rectangular shape, that is, A high voltage electrode terminal 2 to which a high voltage is supplied, a voltage for a convergence electrode, that is, a convergence electrode terminal (hereinafter referred to as a CV electrode terminal) 3 which is an intermediate voltage electrode terminal for obtaining a convergence voltage, and a low voltage electrode. A ground electrode terminal 4 as a terminal is provided, and a resistor layer 5a in a zigzag pattern having a required resistance value is provided between the CV electrode terminal 3 and the ground electrode terminal 4. Between the CV electrode terminal 3 and the resistor layer 5b having the required resistance value
Further, fine adjustment resistor layers 5c are respectively applied between the resistor layers 5a and 5b and the CV electrode terminals 3, and
Are formed. 6, an insulating coating 6 covering the voltage dividing resistor layer 5 is provided as shown in FIG. 7, and the insulating coating 6 is made of a fluid material such as lead glass. , Dried and fired. The fine adjustment resistor layer 5c is partially removed during the manufacturing process of the built-in resistor 7 so that the resistor layer 5a between the terminals can be removed.
And 5b can be adjusted.

FIG. 8 shows a state where the built-in resistor 7 having such a configuration is incorporated in a color cathode ray tube. In the color cathode ray tube shown in FIG. 8, an electron gun assembly 9 is arranged in a neck portion 8a of the tube 8, and the electron gun assembly 9
The first grid electrode G1, the second grid electrode G2, the third grid electrode G3, the fourth grid electrode G4, and the fifth grid electrode G5 are formed in common and arranged coaxially in common for the cathodes K. . Then, a convergence means 10 is arranged at a stage subsequent to the fifth grid electrode G5. Each grid electrode G1, G2, G3, G4, G5 and convergence means 10
Are mechanically connected to each other by a beading glass 11 while maintaining a predetermined positional relationship with each other, and the third grid electrode G3 and the fifth grid electrode G5 are electrically connected by a conducting wire 13. I have. Convergence means 10
Are electrically connected to the fifth grid electrode G5 via the conductive plate 14, and are opposed to each other, and are disposed outside the inner deflection electrode plates 10a and 10b so as to face the inner deflection electrode plates 10a and 10b. It is formed to have outer deflection electrode plates 10c and 10d.

A built-in resistor 7 as shown in FIGS. 6 and 7 is attached to such an electron gun assembly 9,
The high-voltage electrode terminal 2 of the built-in resistor 7 is connected to the fifth grid electrode G5 via a conductive mounting piece 2a. The inner wall of the funnel portion 8b of the tube 8 is coated with a graphite conductive layer 15 extending to the inner wall of the neck portion 8a. The graphite conductive layer 15 has a high-pressure supply button provided on the funnel portion 8b, That is, an anode voltage is supplied through an anode button (not shown). And, on the conductive plate 14,
A conductive spring 16 is provided, and when the conductive spring 16 is brought into contact with the graphite conductive layer 15, the fifth grid electrode G5, the third grid electrode G3, the inner deflection electrode plates 10a and 10b of the convergence means 10, and ,
An anode voltage is supplied to the high-voltage electrode terminal 2 of the built-in resistor 7.

The CV electrode terminal 3 of the built-in resistor 7 is connected to the outer deflection electrode plates 10c and 1c of the convergence means 10 through the conductive mounting piece 3a.
0d, the convergence voltage obtained at the CV electrode terminal 3 by dividing the anode voltage by the resistor layers 5a and 5b is supplied to the outer deflection electrode plates 10c and 10d. Also, the ground electrode terminal 4 of the built-in resistor 7 is connected to the neck 8a of the tubular body 8.
A ground electrode terminal pin 19 buried in the stem 18 at the base of the base is connected via a conductive mounting piece 4a and grounded directly or via a small external adjustment resistor.

In such a color cathode ray tube, in the convergence means 10, an anode voltage is applied to the inner deflection electrode plates 10a and 10b, and to the outer deflection electrode plates 10c and 10d,
The convergence voltage obtained by dividing the anode voltage by the resistor layers 5a and 5b in the built-in resistor 7 and being applied to the CV electrode terminal 3 is applied. Therefore, the inner deflecting electrode plate 10a and the outer deflecting electrode plate 10c in the convergence means 10 are applied. Between and between the inner deflection electrode plate 10b and the outer deflection electrode plate 10d,
A potential difference is provided between the anode voltage and the convergence voltage obtained by dividing the anode voltage. And
Of the three electron beams formed in the electron gun assembly 9, the center one of them passes between the inner deflecting electrode plate 10a and the inner deflecting electrode plate 10b. And between the inner deflection electrode plate 10 and the outer deflection electrode plate 10c.
The light passes through the space between b and the outer deflecting electrode plate 10d and goes to the screen of the color cathode ray tube. At that time, each of the electron beams at both ends is subjected to the action of the potential difference between the inner deflection electrode plate 10a and the outer deflection electrode plate 10c and between the inner deflection electrode plate 10b and the outer deflection electrode plate 10d, and the center of the electron beam is moved to the center. The electron beam is deflected to the electron beam side, and as a result, a convergence state is established in which three electron beams are concentrated on the screen portion of the color cathode ray tube.

D Problems to be Solved by the Invention As described above, when the built-in resistor 7 is used together with the electron gun assembly 9 in the neck portion 8a of the color cathode ray tube, the insulating substrate 1 of the built-in resistor 7 It is desired that the internal resistor 7 has an area as large as possible so that heat can be dissipated effectively. To the vicinity of the intermediate portion of the outer deflection electrode plate 10c or 10d in the convergence means 10 provided in the electron gun assembly 9. The graphite conductive layer 15 attached to the inner wall surface of the tube 8 in the color cathode ray tube has its neck 8a side end position supplied to the outer deflection electrode plates 10c and 10d in the convergence means 10 of the electron gun assembly 9. The convergence voltage fluctuation followability is affected, and in order to improve the convergence voltage fluctuation followability, the neck portion is formed to cover the outer deflection electrode plates 10c and 10d in the convergence means 10 to some extent. It extends to the 8a side.

Therefore, as shown in FIG. 8, the built-in resistor 7 incorporated in the neck portion 8a of the color cathode ray tube has its CV electrode terminal 3 connected to the graphite conductive layer 15 attached to the inner wall surface of the neck portion 8a. In particular, as shown in FIG. 9, both end portions of the CV electrode terminals 3 in the width direction of the insulating substrate 1 are located at positions very close to the graphite conductive layer 15 as shown in FIG. Will be left behind. Therefore, during the actual operation of the color cathode ray tube, for example, floating conductive particles such as free graphite particles generated when the conductive spring 16 is brought into contact with the graphite conductive layer 15 when the electron gun assembly 9 is incorporated into the color cathode ray tube, Under the action of the voltage (convergence voltage) applied between the CV electrode terminal 3 and the conductive mounting piece 3a that contacts the CV electrode terminal 3 and the graphite conductive layer 15, a rapid reciprocating movement is performed, and charging and discharging are repeated. As a result, there is a problem that a state in which a leak current flows between the CV electrode terminal 3 and the graphite conductive layer 15 easily occurs. When such a leakage current flows, the inner deflecting electrode plates 10a and 10b and the outer deflecting electrode plates 10c and 10d in the convergence means 10 have substantially the same potential, and the electron gun assembly 9 The proper convergence action for the three electron beams formed in the inside cannot be achieved, and the image on the screen in the color cathode ray tube is accompanied by color shift.

In view of the foregoing, the present invention provides a resistor element having a predetermined pattern between a low voltage electrode terminal and an intermediate voltage electrode terminal and between an intermediate voltage electrode terminal and a high voltage electrode terminal on an insulating substrate. Is disposed, and has a configuration in which an insulating coating covering these resistor layers is provided on an insulating substrate,
A high voltage such as an anode voltage in the cathode ray tube, which is incorporated in the cathode ray tube and is applied to the high voltage portion electrode terminal, is divided by the resistor layer between the high voltage portion electrode terminal and the low voltage portion electrode terminal,
An intermediate voltage such as a convergence voltage obtained thereby is supplied to a part of the electron gun structure through the intermediate voltage electrode terminal, and in a state where the intermediate voltage unit electrode terminal and the cathode ray tube are incorporated in the cathode ray tube. It is an object of the present invention to provide a built-in resistor of a cathode ray tube, in which a state in which a leak current flows between the tube inner wall conductive layer to which a high voltage is applied is avoided.

E Means for Solving the Problems In order to achieve the above object, the built-in resistor of the cathode ray tube according to the present invention includes an insulating substrate having a rectangular plate shape, and on the insulating substrate, First, second, and third electrode terminals are formed as a low-voltage section, a high-voltage section, and an intermediate voltage section, respectively, and between the first electrode terminal and the third electrode terminal and the third electrode terminal. A first and a second resistor layer having a predetermined pattern are respectively disposed between the first and second electrode terminals, and the first and second resistor layers are further covered with an insulating film. A first electrode terminal is disposed at a position facing one of a pair of opposite short side edges of the insulating substrate, and a second and a third electrode terminal are respectively disposed on the insulating substrate. Are disposed at positions facing each other between the pair of short side edges on each of the long side edges, The second electrode terminal is located between the first electrode terminal and the third electrode terminal. In the neck portion of the cathode ray tube, a direction in which each of a pair of opposed long side edges of the insulating substrate extends is parallel to a tube axis direction of the neck portion, and the first electrode terminal is It is positioned at the end of the neck and assembled.

F Function In the built-in resistor of the cathode ray tube according to the present invention made as described above, the direction in which each of a pair of opposed long side edges of the insulating substrate extends in the neck portion of the cathode ray tube is the neck portion. To be parallel to the pipe axis direction at
In addition, when the first electrode terminal is positioned at the terminal end side of the neck portion and is used in combination, a high voltage is supplied to the second electrode terminal which is a high voltage portion, and the high voltage is applied to the first and second electrode terminals. A divided voltage obtained by dividing the voltage by the second resistor layer is obtained at a third electrode terminal serving as an intermediate voltage portion, and the divided voltage is supplied to a predetermined portion in the cathode ray tube. At this time, the arrangement is such that the second electrode terminal is positioned between the first electrode terminal and the third electrode terminal, and the third electrode terminal serving as the intermediate voltage portion is connected to the insulating substrate. In the insulating substrate, instead of being disposed at a position facing the other side opposite to the first electrode terminal which is a low-voltage portion disposed at a position facing one of a pair of opposite short side edges in the insulating substrate, The second and third electrodes are arranged at a position facing one of the pair of long side edges facing each other between the pair of short side edges so as to be incorporated in the neck of the cathode ray tube. A connection member for connecting the second electrode terminal and the electrode portion for supplying a voltage to each of the terminals, the connection member being positioned near the electrode portion for supplying a voltage thereto; The length of each connection member that connects the electrode part that supplies In addition, the insulating substrate has a relatively large length from the vicinity of the end of the neck portion of the cathode ray tube to the vicinity of the tube inner wall conductive layer attached to the inner wall surface of the cathode ray tube. In this case, the third electrode terminal is disposed at a position which is not close to and opposed to the tube inner wall conductive layer applied to the inner wall surface of the cathode ray tube and to which a high voltage is applied. Therefore, during the operation of the cathode ray tube, leakage current may flow between the third electrode terminal and the tube inner wall conductive layer while the third electrode terminal is sufficiently insulated from the tube inner wall conductive layer. Is avoided, thereby preventing, for example, a situation where the convergence action on the electron beam formed in the electron gun structure is hindered.

G Example G-1 First Example (FIGS. 1 and 2) FIGS. 1 and 2 show an example of a built-in resistor of a cathode ray tube according to the present invention. The built-in resistor 7 'according to this embodiment is similar to the conventional built-in resistor 7 shown in FIGS. 6 and 7, in which a voltage-dividing resistor layer is arranged on an insulating substrate and is covered by an insulating resistor. A coating is provided and formed, and FIGS. 1 and 2 show a state seen through the insulating coating forming the outer surface part. In FIGS. 1 and 2, parts corresponding to the respective parts shown in FIGS. 6 and 7 are denoted by the same reference numerals as in FIG. 6 and FIG. Detailed description is omitted.

In the built-in resistor 7 'shown in FIGS. 1 and 2, one of a pair of short edge portions 1a and 1b opposed to each other is provided on an insulating substrate 1 formed as a rectangular plate. A ground electrode terminal 4 serving as a low voltage portion is formed at a position facing a certain short side edge 1a, and a pair of short side edges is provided on each of a pair of opposed long side edges 1c and 1d. The position facing between the parts 1a and 1b corresponds to the high voltage part electrode terminal 2 and the CV electrode terminal 3 of the built-in resistor 7 shown in FIGS. Electrode terminal 3 '
Are arranged respectively. The position in the direction along the long side edges 1c and 1d of the CV electrode terminal 3 'is in the direction along the short side edge 1b of the insulating substrate 1 and the long side edges 1c and 1d of the high-voltage electrode terminal 2. It is approximately halfway between the positions.

Further, on the insulating substrate 1, the ground electrode terminal 4 and the CV electrode terminal 3 resistor layer 5a containing 'arranged between the adjustment resistor layer 5c ₁ and having a zigzag pattern''
And a voltage dividing resistor layer 5 ′ including a resistor layer 5 b ′ and a fine adjustment resistor layer 5 c ₂ ′ disposed between the high voltage electrode terminal 2 and the CV electrode terminal 3 ′. 6 and 7 are provided as equivalent to the voltage dividing resistor layer 5 formed by the resistor layers 5a and 5b and the fine adjustment resistor layer 5c in the built-in resistor 7 shown in FIGS. I have. Further, on the insulating substrate 1, an insulating coating 6 made of, for example, lead glass, which covers the voltage dividing resistor layer 5 ', is provided.

The resistor layer 5a 'disposed between the ground electrode terminal 4 and the CV electrode terminal 3' is incorporated with the ground electrode terminal 4 and, for example, a color cathode ray tube as shown in FIG. When a voltage is applied, a certain meandering is provided between the high potential difference portion P where the difference between the surface potential of the insulating film 6 and the potential of the resistor layer 5a 'becomes large. It is to form a zigzag pattern having a width,
A first pattern portion 5al 'for reducing the meandering pitch of the zigzag pattern, followed by the high potential difference portions P and CV
A second pattern portion arranged between the electrode terminal 3 'and a zigzag pattern having a constant meandering width and having a large meandering pitch of the zigzag pattern;
It is constructed out with 5AH 'and trimmer resistor layer 5c _1'. Thus, the first pattern portion 5a constituting the resistor layer 5a '
l ′ and the second pattern portion 5ah ′ have zigzag patterns having different meandering pitches,
The effective length of the first pattern portion 5al 'within the unit length between the ground electrode terminal 4 on the insulating substrate 1 and the high potential difference portion P is equal to the effective length of the high potential difference portion P on the insulating substrate 1 and the CV electrode terminal 3'. Therefore, the resistance value of the resistor layer 5a 'per unit length between the ground electrode terminal 4 and the high potential difference portion P is larger than the effective length of the second pattern portion 5ah' within the unit length of The resistance value of the resistor layer 5a 'per unit length between the high potential difference portion P and the CV electrode terminal 3' is larger than the resistance value of the resistor layer 5a '. Is reduced.

Further, the resistance layer 5b 'and fine adjustment resistor layer 5c _2' is
A resistor layer is provided between the high voltage unit electrode terminal 2 and the CV electrode terminal 3 '.
5b 'is connected to the high-voltage part electrode terminal 2 side and connected in series. The position of the fine adjustment resistor layer 5c ₂ ′ on the insulating substrate 1 is different from that of the CV electrode terminal 3 ′ and the short side end of the insulating substrate 1. Rim
1b. That is, the fine adjustment resistor layer
5c ₂ ′ is one end of the short side edge 1b of the insulating substrate 1
It is arranged to face.

G-2 CRT Using First Embodiment (FIGS. 3 and 4) FIG. 3 shows a state in which the built-in resistor 7 'constructed as described above is incorporated in a color cathode ray tube. . Such a color cathode ray tube has the same configuration as the color cathode ray tube shown in FIG. 8, and in FIG. 3, the portions corresponding to the respective portions shown in FIG. , And detailed description thereof will be omitted.

In the color cathode ray tube shown in FIG.
Inside the neck portion 8a, the built-in resistor 7 'is arranged such that the direction in which each of the pair of long side edges 1c and 1d extends is parallel to the tube axis direction of the neck portion 8a, and
The ground electrode terminal 4 is located at the end of the neck portion 8a, and is incorporated together with the electron gun assembly 9. The high-voltage electrode terminal 2 of the built-in resistor 7 'is connected to the fifth terminal.
Connected to the grid electrode G5 via the conductive mounting piece 2a,
The CV electrode terminal 3 'is connected to the outer deflection electrode plate 10c of the convergence means 10 via the conductive mounting piece 3a', and the ground electrode terminal 4 is connected to the ground electrode terminal pin 19 via the conductive mounting piece 4a. Have been. In the case of such a built-in resistor 7 ′, the CV electrode terminal 3 ′ is not disposed opposite to the ground electrode terminal 4 at a position facing the short side edge 1 b on the insulating substrate 1, but is insulated. Since the long side edge 1d on the substrate 1 is arranged with a position facing between the short side edges 1a and 1b, the mounting position on the outer deflection electrode plate 10c via the conductive mounting piece 3a 'is provided. Is the end of the outer deflection electrode plate 10c on the fifth grid electrode G5 side.

As shown in detail in FIG. 4, the built-in resistor 7 'incorporated in the color cathode ray tube as described above has its CV electrode terminal 3' connected from the funnel portion 8b side of the tube 8 to the neck portion 8a. Graphite conductive layer deposited on the inner wall
The fifteen end portions on the side of the neck portion 8a (indicated by a dashed line in FIG. 4) are arranged at a position separated by a predetermined distance x from the end portion of the neck portion 8a. In other words, the CV electrode terminal 3 'is arranged at a position which does not come close to and oppose the graphite conductive layer 15 attached to the inner wall surface of the tube 8, with the built-in resistor 7' incorporated in the color cathode ray tube. . The distance x is selected to be, for example, 2 mm or more.

Thus, the built-in resistor 7 ′ is connected to the neck 8 a of the graphite conductive layer 15 attached to the inner wall surface of the tube 8.
With the CV electrode terminal 3 'arranged at a distance x from the edge on the side of the side, the convergence means 10 allows the inner deflection electrode plates 10a and 10b to have a graphite conductive layer even in the incorporated color cathode ray tube. An anode voltage is applied to the outer deflection electrode plates 10c and 10d from the resistor layers 5a 'and 5b' forming the voltage dividing resistor layer 5 'in the built-in resistor 7'. Is divided and a convergence voltage obtained at the CV electrode terminal 3 'is applied. Therefore, the inner deflection electrode plate 10a
A potential difference between the anode voltage and the convergence voltage obtained by dividing the anode voltage is applied between the outer deflection electrode plate 10c and the inner deflection electrode plate 10b and between the inner deflection electrode plate 10d and the outer deflection electrode plate 10d. Thereby, a convergence state is achieved in which the three electron beams formed in the electron gun assembly 9 are concentrated on the screen portion of the color cathode ray tube.

At this time, the CV electrode terminal 3 'provided on the built-in resistor 7'
Is disposed at a position separated by a distance x from the end portion of the graphite conductive layer 15 on the neck portion 8a side without closely approaching the graphite conductive layer 15 attached to the inner wall surface of the neck portion 8a. During the operation of the color cathode ray tube, for example, floating conductive particles such as free graphite particles existing in the neck portion 8a are separated from the CV electrode terminal 3 'and the conductive mounting piece 3a' contacting the CV electrode terminal 3 'and the graphite conductive layer. 15 between the CV electrode terminal 3 'and the graphite conductive layer 15 by performing rapid reciprocating movement and charging and discharging under the action of a voltage applied between the CV electrode terminal 15 and the graphite conductive layer 15. No condition occurs. Therefore, the convergence means 10 always performs an appropriate convergence action on the three electron beams formed in the electron gun assembly 9, and a high-quality image can be obtained on the screen of the color cathode ray tube.

G-3 Second Embodiment (FIG. 5) FIG. 5 shows another example of the built-in resistor of the cathode ray tube according to the present invention. The built-in resistor 7 "of this embodiment has many parts configured in the same manner as the examples shown in FIGS. 1 and 2, and corresponds to the respective parts shown in FIG. 1 in FIG. The parts are denoted by the same reference numerals as in Fig. 1. Also, Fig. 5 shows a state in which the built-in resistor 7 "is seen through from the insulating film 6 forming the outer surface thereof. Have been.

The built-in resistor 7 ″ is a resistor layer provided between the high voltage unit electrode terminal 2 and the CV electrode terminal 3 ′ on the insulating substrate 1.
In the arrangement mode of 5b ′ and the fine adjustment resistor layer 5c ₂ ′,
It is different from the example shown in FIG. 1 and FIG. That is, in the built-in resistor 7 ", the resistor layer 5b '
And the fine adjustment resistor layer 5c ₂ ′ is connected to the high voltage part electrode terminal 2 and CV.
A resistor layer 5b 'is provided between the CV electrode terminal 3' and the electrode terminal 3 '.
The resistor layer 5b 'on the insulating substrate 1 has one end connected to the CV electrode terminal 3' close to the short side edge 1b of the insulating substrate 1. It is arranged in such a way that The other parts are the same as in the example shown in FIGS. 1 and 2.

Then, for example, it is used by being incorporated in a color cathode ray tube as shown in FIG. 8 in the same manner as in the example shown in FIGS. 1 and 2, whereby the color cathode ray tube shown in FIGS. 1 and 2 is used. The same operation and effect as in the case of this example can be obtained.

H Effect of the Invention As is apparent from the above description, the built-in resistor of the cathode ray tube according to the present invention has a first electrode terminal serving as a low voltage portion and a third electrode terminal serving as an intermediate voltage portion on an insulating substrate. , And between the third electrode terminal and the second electrode terminal serving as a high-voltage end, a resistor layer having a predetermined pattern is provided, and an insulating coating covering these resistor layers is provided. Is incorporated in the cathode ray tube under the configuration provided on the insulating substrate, and applies a high voltage such as an anode voltage in the cathode ray tube applied to the second electrode terminal to the second electrode terminal and the first electrode terminal. When the voltage is divided by the resistor layer between the electrode terminals and the resulting intermediate voltage, for example, a convergence voltage, is supplied to a part of the electron gun structure through the third electrode terminal. , When installed in a cathode ray tube , Each of the second and third electrode terminals is located in the vicinity of an electrode portion for supplying a voltage thereto, and further, the third electrode terminal is a tube inner wall conductive layer to which a high voltage such as an anode voltage is applied. Are disposed at a position separated by a predetermined distance from the conductive layer on the inner wall of the tube, without being opposed to the inner surface of the tube. Therefore, in the case where the built-in resistor of the cathode ray tube according to the present invention is used by being incorporated in the cathode ray tube, a connecting member for connecting the second electrode terminal and an electrode portion for supplying a voltage thereto, and a third member. The length of each of the connecting members for connecting the electrode terminal and the electrode part supplying a voltage thereto is relatively short, and further, when the cathode ray tube is in operation, the third electrode terminal is connected to the inner wall of the tube. A state in which a leak current flows between the third electrode terminal and the tube inner wall conductive layer while being sufficiently insulated from the conductive layer is avoided, thereby, for example, in the electron gun structure. The occurrence of a situation in which the convergence action on the formed electron beam is hindered is prevented.

[Brief description of the drawings]

1 and 2 are a plan view and a side view showing an example of a built-in resistor of a cathode ray tube according to the present invention, and FIG. 3 is a view of a cathode ray tube incorporating the example shown in FIGS. 1 and 2. FIG. 4 is a schematic configuration diagram showing a main part, FIG. 4 is an enlarged configuration view showing a part of a main part of the cathode ray tube shown in FIG. 3, and FIG. Plan view showing an example of FIG.
FIG. 7 and FIG. 7 are a plan view and a side view showing a built-in resistor of a conventional cathode ray tube, and FIG. 8 shows a main part of the cathode ray tube in which the built-in resistor shown in FIGS. 6 and 7 is incorporated. FIG. 9 is a schematic configuration diagram, and FIG. 9 is a cross-sectional view of a part of a main part of the cathode ray tube shown in FIG. In the figure, 1 is an insulating substrate, 1a and 1b are short side edges, 1c and 1d
Is a long side edge, 2 is a high voltage electrode terminal, 3 'is a convergence electrode terminal, 4 is a ground electrode terminal, 5' is a voltage dividing resistor layer, 6 is an insulating film, 7 'and 7 "are built-in resistors. , 8a are a neck portion, 9 is an electron gun structure, and 15 is a graphite conductive layer.

Claims (1)

(57) [Claims] 1. An insulating substrate having a rectangular plate shape, and first, second and third electrodes formed on the insulating substrate as a low voltage portion, a high voltage portion and an intermediate voltage portion, respectively. A predetermined pattern is provided between the terminal and the first electrode terminal and the third electrode terminal on the insulating substrate, and between the third electrode terminal and the second electrode terminal. A first and a second resistor layer, and an insulating coating provided on the insulating substrate so as to cover the first and the second resistor layers, The first electrode terminal is disposed at a position facing one of a pair of opposed short side edges of the insulating substrate, and the second and third electrode terminals are respectively opposed to each other on the insulating substrate. Each of the pair of long side edges is arranged at a position facing between the pair of short side edges, The second
Is positioned between the first electrode terminal and the third electrode terminal, and the direction in which each of the pair of long side edges extends in the neck portion of the cathode ray tube is at the neck portion. A built-in resistor of a cathode ray tube, wherein the built-in resistor is arranged so as to be parallel to the tube axis direction and the first electrode terminal is positioned and incorporated at the terminal end of the neck portion.