JPS5943636Y2 - Cathode ray tube with built-in resistor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a so-called resistor built-in cathode ray tube in which a dividing resistor for obtaining an intermediate potential is built into the cathode ray tube.

For example, in a color cathode ray tube based on the Trinitron (registered trademark) method, the first grid 01 to the fifth grid G5, which are common to a plurality of cathodes, are arranged coaxially, and the front end of the fifth grid G5 has a quadrupole deflection. The electron gun is equipped with a convergence means consisting of an electrode, an anode voltage is applied to the inner deflection electrode of the convergence means, and a voltage of 0.4 V to 0.4 V to the outer deflection electrode is applied to the inner deflection electrode of the convergence means.
A so-called convergence voltage lower than 1.5 V is applied.

Such a convergence voltage is usually supplied from a high voltage block outside the cathode ray tube independently of the anode voltage through a coaxial cable, a coaxial button, and a convergence voltage supply pipe.

On the other hand, in such color cathode ray tubes, it has been considered to apply a relatively high potential to the fourth grid G4, which is the focus electrode, in order to reduce electron lens aberration and improve the beam spot of the electron beam. In this case, such a relatively high focus voltage is supplied through the stem pin from a separate power supply.

In such color cathode ray tubes, the voltage supply is extremely complicated, and especially when applying a relatively high focus voltage through the stem pins, discharge or leakage may occur between the stem pins, or focus It had the disadvantage of being extremely isolated in terms of circuitry and structure, such as the need for a separate power supply for voltage.

In view of the above points, the present invention provides a resistor built-in cathode ray tube which has a simple voltage supply system and eliminates the above-mentioned conventional drawbacks.

In the present invention, a so-called divided resistance plate, which is formed by printing a resistance path on the surface of an insulating substrate, is placed inside the cathode ray tube, and different electrodes of the electron gun, such as the above-mentioned outer deflection electrode, are connected to each other via the divided resistance. A predetermined convergence voltage and a focus voltage are applied to the fourth grid G4 and the fourth grid G4, respectively.

As a cathode ray tube based on this idea, for example, the configuration shown in FIG. 1 can be considered.

That is, in FIG. 1, reference numeral 1 indicates an electron gun disposed within a cathode ray tube body 2, in which a first grid 01 to a fifth grid G5 common to a plurality of cathodes KrKgKb are disposed coaxially. Further, a convergence means C consisting of four polar deflection electrodes 3a, 3b, 4a, and 4b is arranged at the front end of the fifth grid G5.

The third grid G3 and the fifth grid G5 are connected via the lead wire 5, and the fifth grid G5 and the third grid G3
An anode voltage HV is applied to the inner deflection electrodes 4a and 4b of the convergence means via the inner carbon film 6 and the conductive contact piece 7.

A divided resistor plate 8 is arranged in this cathode ray tube so as to be parallel to the side surface of the grid Gt-05.

This divided resistance plate 8 has a resistance path 10 printed on the surface of an insulating substrate 9 made of ceramic or the like from one edge to the other edge, as shown in FIGS. and terminals 11A, 11B, 1 at predetermined intermediate positions, respectively.
1C and 11D, the terminal 11A is connected to the fifth grid G5, the terminal 11B is connected to the grounded stem pin 12, the terminal 11C is connected to the outer deflection electrodes 3a and 3b, and the terminal 11D is connected to the fourth grid G4, respectively. Connection is made via suitable conductive means.

An adjustment resistor 13 is externally attached to the stem focus 2.

According to such a configuration, the divided resistor plates 8 are arranged in the tube body 2, and the focus voltage F is set by dividing the resistors.
Since V and the convergence voltage C can be supplied, the structure is extremely simplified compared to the conventional one.

However, in the case of the configuration shown in FIG. 1, if a leakage current occurs due to discharge etc. between the fourth grid G4 and the fifth grid G5 or the third grid 03, a potential drop naturally occurs. As the potential of the terminal 11C changes, that is, the convergence voltage C■ changes, the inner deflection electrode 4 a p 4 b and the outer deflection electrode 3 a j
There is a risk that the potential difference between a and b will fluctuate and convergence will not occur, resulting in color shift.

This degrades image quality and must be avoided.

Therefore, in the present invention, such a divided resistance plate 8 is used. In this case, a plurality of resistance paths, that is, two resistance paths, are each constructed, and an anode potential is applied to one end of each resistance path. A reference potential such as ground is applied to the end, and a focus voltage FV and a convergence voltage C■ are applied from the respective resistance paths to the corresponding electrodes, that is, the fourth grid G4, which is the focus electrode in this case, and the outer deflection electrode 3a3b. The configuration is such that even if a leakage current occurs, potential fluctuations in the convergence voltage are avoided and deterioration in image quality is prevented.

Next, embodiments of the present invention will be described.

FIG. 4 shows an embodiment of the present invention.

In this figure, parts corresponding to those in FIG. 1 are designated by the same reference numerals, and redundant explanation will be omitted.

In this example, as shown in FIGS. 5A, B, and C, a first resistance path 14 is formed on one surface of a common insulating substrate 9, and a second resistance path 14 is formed on the other surface. forming a resistance path 15;
Both terminals of both resistance paths 14 and 15 are connected to 11A and IIA.
' and 11B.

11B', and the terminal 11 is located at an intermediate position of one resistance path 14, that is, at a position where a convergence voltage C■ is obtained.
A divided resistor plate 16 is provided with a terminal 11D formed at an intermediate position of the resistor path 15 on the other side, that is, at a position where the focus voltage FV is obtained.

Note that it is possible to apply the glass coat 11 to both surfaces of the divided resistance plate 16.

As shown in FIG. 4, the divided resistor plate 16 is arranged in the tube body 2 so as to be parallel to the electron gun and hence to the side surface of the grid Gt-G5, and its terminals 11A and 11A' are commonly connected to the fifth grid G5. From this, the anode voltage HV is applied to the terminals 11A and 11A/, and the terminal 11B.

11B' to the stem pin 12, and then terminal 1.
1B and 11B' are applied with a low reference voltage such as ground, and further a convergence voltage C is applied to the outer deflection electrodes 3a and 3b through the intermediate terminal 11C of the first resistance path 14,
The focus voltage FV is applied to the fourth grid G4 through the intermediate terminal 11D of the second resistance path 15.

A resistor 13 for fine adjustment is externally connected between the stainless steel pin 12 and the ground.

Fine adjustment of the convergence voltage C2 and focus voltage FV in this case is performed as follows.

For example, the focus voltage FV is adjusted by an external resistor 13, and the convergence voltage C2 is adjusted by a quadrupole magnet provided around the neck.

Of course, conversely, it is also possible to adjust the focus voltage with a quadrupole magnet and adjust the convergence voltage C with an external resistor 3.

According to this configuration, by arranging one divided resistor plate 16, relatively high focus voltage and convergence voltage can be stably provided through the divided resistors from the respective resistance paths 14 and 15 during operation. The circuit and structure are extremely simplified compared to conventional high-pressure supply means.

Moreover, in the present invention, two resistor paths 14 and 15 are particularly provided, and the convergence voltage CV and focus voltage FV are applied independently from the respective resistor paths 14 and 15, so that the fourth Grits G
Even if a leakage current occurs between the grid 4 and the fifth grid G5 or the third grid 03, it will not affect the first resistance path 14, and therefore the convergence voltage will not change due to such leakage current, and the image quality will be affected. will not deteriorate.

Furthermore, since a relatively high focus voltage is applied via the dividing resistor plate 16, there is no discharge or leakage current between the stem pins as in the conventional case, and there is no need to provide a separate power source for the focus voltage.

In addition, fine adjustment of the convergence voltage and focus voltage is performed using an external resistor 13 and a quadrupole magnet in the case of Fig. 4, but fine adjustment using a quadrupole magnet has the disadvantage of distorting the beam spot. However, this is not a very desirable adjustment method.

The embodiment shown in FIG. 6 is a further improvement on this.

That is, in the same figure, although the same numbers are added to the parts corresponding to those in FIG. 4, in this case, the same dividing resistor plate 16 as shown in FIGS. 14 and 15
The stem pin 12 separates the terminals 11B and 11B from each other.
．． 12/ and their respective stem pins 12 and 1
The separate external connections 2/ are grounded through resistors 13 and 13'.

The connections of the other terminals 11A, 11A', 11C and 11D are exactly the same as in FIG.

According to such a configuration, the focus voltage FV and the convergence voltage C■ are each connected externally to the resistor 13'.
and 13 enable fine adjustment, so that an extremely good image can be obtained without distortion of the beam spot.

As mentioned above, according to the present invention, the convergence voltage and the focus voltage are supplied by the voltage dividing resistors through the dividing resistor plate disposed inside the tube. High-voltage blocks, coaxial cables, coaxial buttons, and even convergence voltage supply pipes are no longer required, and assembly work is also omitted, leading to cost reductions.

Further, since a separate power source for supplying focus voltage is not required and focus voltage is not supplied from the stem pin, problems such as withstand voltage and leakage between stem pins are solved, and a highly reliable cathode ray tube can be provided.

The above example shows the case where it is applied to a Trinitron (registered trademark) type cathode ray tube, but other electron guns that apply relatively high and different voltages to different electrodes among the electrodes that make up the electron gun are also applicable. The present invention can also be applied to cathode ray tubes.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a cathode ray tube with a built-in resistor used to explain the present invention, Figs. 2 and 3 are a plan view and a side view of its divided resistor plate, and Fig. 4 shows an embodiment of the present invention. Schematic diagram, 5th
Figures A, B, and C are top, side, and bottom views, respectively, of divided resistor plates used in the present invention, and Fig. 6 is a schematic diagram showing another embodiment of the present invention. 1... Electron gun, 2... Tube body, 14, 1
5...First and second resistance paths, 8, 16...
...It is a split resistance plate.

Claims (1)

[Scope of utility model registration request] A plurality of resistance paths, each having an anode potential and a reference potential applied to each end, are arranged on the front and back surfaces of a common insulating substrate and are built into the cathode ray tube, and the above-mentioned resistance paths are applied to the different electrodes that make up the electron gun. A cathode ray tube with a built-in resistor that is supplied with partial voltage power from a resistive path.