KR100730103B1 - Stem for cathode ray tube - Google Patents

Abstract

Disclosed is a stem for a cathode ray tube. The present invention relates to a stem having a stem body, an exhaust pipe provided at a center thereof to provide a passage for evacuating the inside of the bulb, and a plurality of lead pins selectively inserted into pinholes formed in the stem body. Are arranged to maintain a constant interval in an annular shape, and the interval between the lead pin to which the static voltage is applied among the lead pins and the lead pin to which the dynamic voltage which is relatively higher than the static lead pin is applied is formed differently from the interval of the other lead pins. Insulation breakdown due to voltage difference can be prevented in advance.

Description

Stem for cathode ray tube

1 is a plan view showing a conventional stem portion,

2 is a sectional view showing a conventional cathode ray tube,

3 is a cross-sectional view schematically showing a neck portion provided with a stem portion according to an embodiment of the present invention;

4 is a plan view showing a stem according to a first embodiment of the present invention;

5 is a plan view showing a stem portion according to a second embodiment of the present invention;

6 is a plan view showing a stem portion according to a third embodiment of the present invention;

<Description of the symbols for the main parts of the drawings>

10,30 ... stem part 11,31,41 ... stem body part

12, 32, 42 ... Exhaust pipe 13, 33, 43 ... Pinhole

14,34,44 ... Lead pin 14a, 44a, 54a, 64a ... common pin

14b, 44b, 54b, 64b ... static lead pins

14c, 44c, 54c, 64c ... dynamic lead pins

15.Protrusion 22a ... Neck

The present invention relates to a stem, and more particularly, to a stem for a cathode ray tube arranged by adjusting the spacing of lead pins.

Typically, the electron gun is mounted in the neck portion of the bulb, and includes at least one focusing electrode arranged to face the cathode, the control electrode, the triode made of the screen electrode, and the screen electrode to form the preliminary focusing lens part, and the focus. And a final acceleration electrode disposed to face the electrode to form a main focusing lens portion, and a stem portion for supplying a predetermined voltage to the cathode and the electrodes.

When power is applied to the electron gun, it emits an electron beam. The emitted electron beam is focused and accelerated while passing through the electron beam passing holes formed in the electrodes. The accelerated electron beam is selectively deflected by a deflection yoke installed in the cone portion of the bulb, and excites the phosphor of the fluorescent film formed on the inner surface of the panel to realize an image.

1 shows a conventional stem portion 10.

Referring to the drawings, the stem portion 10 is a stem body portion 11 which is sealed to the neck portion, and formed in the center of the body portion 11 and the exhaust pipe 12 for providing a passage for vacuuming the inside of the bulb And a plurality of pinholes 13 formed to be annularly spaced apart from each other in the body portion 11, lead pins 14 inserted into the pinholes 13, and deformation of the lead pins 14. In order to include a projection 15 formed along the edge of the pinhole (13).

Lead pins 14 are selectively inserted into the pinholes 13 so as to apply voltages to the cathode of the electron gun and the plurality of electrodes. In the conventional case, the lead pins 14 are inserted into ten pinholes among the fourteen pinholes 13 arranged at equal intervals. The lead pin 14 is not inserted into the remaining pin holes, and the lead pin may be additionally inserted according to the voltage applied to the electrode.

At this time, one of the inserted lead pin 14 is a common pin (common pin, 14a) is interposed in the state that the power is not applied. Also, in the dynamic focus electron gun, the lead pin 14b to which the static voltage is applied and the lead pin 14c to which the dynamic voltage is applied are arranged adjacent to each other.

In the conventional cathode ray tube having the stem portion 10 having such a structure, as the optical deflection angle of the electron beam scanned from the electron gun increases, the voltage applied to the dynamic lead pin 14c is applied to the static lead pin 14b. It is relatively larger than the applied voltage. As a result, insulation failure occurs due to the failure of the withstand voltage due to a noticeable voltage difference between the two lead pins 14b and 14c. As a result, current leakage or even short circuit occurs.

The present invention is to solve the problems as described above, it is an object of the present invention to provide a stem for cathode ray tube blocking the current leakage by adjusting the spacing of the lead pin disposed in the stem.

In order to achieve the above object, the stem for a cathode ray tube according to one aspect of the present invention,

A stem body portion sealed to the neck end of the bulb, an exhaust pipe formed at the center of the stem body portion to provide an air passage when evacuating the bulb interior, and a pin hole selectively inserted into the pin hole formed in the stem body portion And a plurality of lead pins for applying a voltage to an electron gun consisting of a plurality of electrodes, the stem for a cathode ray tube comprising:

The lead pin is arranged to maintain a predetermined interval in the annular,

The interval between the lead pin to which the static voltage is applied among the lead pins and the lead pin to which the dynamic voltage which is relatively higher than the static lead pin is applied may be formed to be different from that of other lead pins.

In addition, the distance between the static lead pin and the dynamic lead pin is characterized in that it is formed relatively wider than the gap between the other lead pin in order to prevent insulation breakdown due to the voltage difference.

Furthermore, the lead pins are arranged at regular intervals,

Any one of the static lead pins and the dynamic lead pins may be moved in such a way that the lead pins are inserted into the pinholes in the opposite direction with respect to the relative lead pins, and the intervals thereof are relatively wider than the gaps between the other lead pins. do.

In addition, any one of the static lead pins and the dynamic lead pins may be positioned at an outer portion of the lead pins that maintain a predetermined interval in an annular shape, and the gap may be disposed relatively wider than the gap between the other lead pins. .

Furthermore, the static lead pins and the dynamic lead pins may be positioned at both outer portions of the annular lead pins so that their spacing is relatively wider than the spacing between other lead pins.

When the annular diameter of the lead pin is 12 millimeters, the spacing between the lead pins is 3.4 millimeters, and the spacing between the static lead pins and the dynamic lead pins is 5.0 millimeters or more.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIG. 2, the cathode ray tube 20 is provided with a panel 21 having a fluorescent film formed on an inner surface thereof, a funnel 22 encapsulated with the panel 21, and spaced a predetermined distance inside the panel 21. And a shadow mask 23 formed with a number of electron beam passing holes through which the electron beam passes. The shadow mask 23 is coupled to the shadow mask frame 24 and is fixed by the stud pins 25 and the hook springs 26 formed on the inner surface of the panel 21 to be positioned within the panel 21. have.

Inside the neck portion 22a of the funnel 22, an electron gun 27 for emitting red, green, and blue electron beams is enclosed in a fluorescent film formed inside the panel 21, and the cone portion 22b has an electron beam. The deflection yoke 28 is provided to deflect according to the dice.

The inner and outer surfaces of the funnel 22 have a glass funnel 22 as an insulator, so that the inner graphite layer 29 and the outer graphite layer may serve as a capacitor for stabilization of the high pressure applied to the anode. 200) are formed respectively.                     

The electron gun 27 is provided so as to face the cathode, the control electrode, the tripolar portion of the screen electrode, a plurality of focus electrodes which are disposed to face the screen electrode and form a prefocus lens, and the final focus electrode. And a final acceleration electrode forming a focusing lens unit. A shield cup 210 is installed in front of the electron gun 27, and a plurality of bulb spacers 220 are attached to an outer circumferential surface of the shield cup 210. The bulb spacer 220 elastically contacts the embedded graphite layer 29 to provide a positive electrode to the final acceleration electrode of the electron gun 27. At the end of the neck portion 22a, a stem portion 230 for applying a predetermined voltage to the cathode of the electron gun 27 and the plurality of electrodes is provided.

3 illustrates a stem portion 30 according to an example of the present invention.

Referring to the drawings, the stem portion 30 has a stem body portion 31 sealed to the end of the neck portion 22a of the bulb. The stem body portion 31 has a circular shape, the diameter of which corresponds to the diameter of the neck portion 22a. The stem body portion 31 has a through-hole 32a is formed in the center portion, the exhaust pipe 32 for providing a passage through which air is discharged during the vacuum exhaust inside the bulb is formed integrally. The exhaust pipe 32 is melted by sealing the end of the stem body portion 31 at the end of the neck portion 22a to make the inside of the bulb completely vacuum.

The stem body portion 31 has a plurality of pin holes 33 are formed to penetrate the stem body portion 31 to be spaced apart by a predetermined interval in an annular shape. A lead pin 34 for inserting a predetermined voltage to the cathode of the electron gun or the plurality of electrodes is inserted into the inner circumferential surface of the pinhole 33. The lead pin 34 includes an inner pin 34a facing the neck portion 22a, an outer pin 34b facing the outside of the stem body portion 31 in the opposite direction, and the inner pin 34a. Connection pins 34c located in the body portion 31 are integrally formed to interconnect the external pins 34b.

In the stem body portion 31 in which the inner pin 34a is positioned, a protrusion 35 for reinforcing strength to prevent deformation of the pin 34a protrudes from the outer circumferential surface of the pinhole 33 to a predetermined height.

According to a feature of the present invention, the lead pin 34 has a different position or spacing formed in the stem body portion 31.

4 shows the stem portion 40 according to the first embodiment of the present invention.

Referring to the drawings, the stem portion 40 is formed in the annular spaced intervals annularly on the stem body portion 41, the exhaust pipe 42 formed at the center thereof, and the stem body portion 41 as described above. And a pinhole 43, a lead pin 44 inserted into an inner circumferential surface of the pinhole 43, and a protrusion 45 formed along an edge of the pinhole 43.

The pinholes 13 are arranged while maintaining a constant interval. In the case of a mini neck having a diameter of the neck portion 22a (see FIG. 3) of 20 to 25 millimeters, 14 holes are formed. Among the pinholes 13, cathodes for emitting substantially red, green, and blue electron beams, and lead pins 44 for applying voltages to a plurality of electrodes are selectively inserted in accordance with the wiring method. In the present embodiment, the lead pin 44 is inserted into 10 pinholes among the 14 pinholes 43, whereas the lead pin 44 is not inserted into the remaining 4 holes.                     

In addition, one of the lead pins 44 is called a common pin 44a and is inserted in a state in which power is not applied. In some cases, one of the lead pins 44 is electrically connected to one of the cathodes and the plurality of electrodes. Could be connected.

In addition, in order to improve the focus characteristic of the electron beam at the periphery of the screen forming the image, one of the lead pins 44 is provided with a lead pin 44b to which a static voltage is applied, and in the adjacent pinhole, the static lead pin ( A lead pin 44c to which a dynamic voltage having a higher voltage than 44b is applied is inserted.

Here, the space between the static lead pin 44b and the dynamic lead pin 44c is wider than that of the other lead pins. That is, when the diameter of the lead pin 44 forming an annular shape is 12.0 millimeters, the distance D ₁ between other adjacent lead pins is 3.4 millimeters, whereas the distance between the static lead pins 44b and the dynamic lead pins 44c is different. Phosphorus D ₂ is formed to maintain 5.0 millimeters wider than the gap.

This is to prevent dielectric breakdown due to the voltage difference applied to the static lead pin 44b and the dynamic lead pin 44c. Accordingly, the pinholes into which the static lead pins 44b and the dynamic lead pins 44c are inserted are formed to have a wider gap than the pin holes into which the other lead pins are inserted.

In fact, according to the experiments of the present applicant, if the distance between all the conventional lead pins is maintained at 3.4 millimeters, it can withstand only about 5 kilovolts or less of the withstand voltage, but as compared with other lead pins as in the present embodiment, In this case, when the distance between the static lead pin 44b and the dynamic lead pin 44c having a large mutual voltage difference of 5.0 millimeters was maintained, insulation breakdown did not occur even at a breakdown voltage of approximately 10 kilovolts.

5 shows a stem portion according to a second embodiment of the present invention.

Like reference numerals in the drawings shown above indicate the same members having the same function. Here, only the features according to the embodiment of the present invention will be described with an extract.

Referring to the drawings, the lead pins 44 are arranged in an annular shape with equal intervals. The spacing D ₁ of the lead pin 44 is 3.4 millimeters. At this time, the lead pin 44 is selectively inserted into the pin hole 45. The lead pin 54b to which the static voltage is applied is moved to the common pin 44a and inserted into the pin hole where the lead pin is not interposed. On the other hand, the lead pin 54c to which the dynamic voltage is applied is inserted in the same position as in the first embodiment.

Accordingly, the gap D ₃ between the static lead pin 54b and the dynamic lead pin 54c is approximately twice as large as the gap D ₁ between the other lead pins. That is, in the first embodiment, the distance between the static lead pins 44b and the dynamic lead pins 44c is wider than the distance between the other lead pins, whereas in the second embodiment, the lead pins 44 are equally spaced apart from each other. The static lead pin 54b is inserted into the pinhole by moving one space toward the common pin 54a so as to be relatively spaced apart from the dynamic lead pin 54c.

As a result, as the optical deflection of the electron beam increases due to the planarization of the image, the distance between the static lead pin 54b and the dynamic lead pin 54c, which has a relatively large voltage difference, is doubled than that of other lead pins. There is a number.

6 shows a stem portion according to a third embodiment of the present invention.

Here, only the features according to the embodiment of the present invention will be described with reference to.

Referring to the drawings, the general lead pins 44 are arranged in an annular shape at equal intervals (diameter is approximately 12 millimeters) on the stem body portion 41. The spacing D ₁ of the lead pin 44 is maintained at 3.4 millimeters. As described above, the pinhole 45 is selectively inserted with a cathode and a lead pin 44 applied to each electrode.

Here, the lead pin 64b to which the static voltage is applied and the lead pin 64c to which the dynamic voltage is applied are located outside the other lead pin 44 arranged in an annular shape. That is, in contrast while keeping a distance D ₁ from the case of the lead pins 44 inserted in the pin hole (45), said static lead pin (64b) and a spacing of D ₄ of the dynamic lead pin (64c) is 10 kilo It is formed on the outer portion of the annular lead pin 44 in a state in which a gap of at least 5 millimeters or more is maintained at which the breakdown voltage does not occur even with the withstand voltage of the bolt. In this case, only one of the static lead pins 64b or the dynamic lead pins 64c may be located at an outer portion of the lead pins disposed in an annular shape to maintain the gap.

As described above, the stem for a cathode ray tube of the present invention has a gap between a lead pin to which a static voltage is applied and a lead pin to which a relatively high voltage dynamic voltage is applied among the electrodes of the electron gun. By extending it wider than the gap between the lead pins, it is possible to prevent losses due to dielectric breakdown even if the withstand voltage due to the voltage difference between the two lead pins increases. Therefore, the reliability can be ensured even when a high voltage is applied according to the light deflection angle of the electron beam due to the enlargement and planarization of the cathode ray tube.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

Claims (6)

A stem body portion sealed to the neck end of the bulb, an exhaust pipe formed at the center of the stem body portion to provide an air passage when evacuating the bulb interior, and a pin hole selectively inserted into the pin hole formed in the stem body portion And a plurality of lead pins for applying a voltage to an electron gun consisting of a plurality of electrodes, the stem for a cathode ray tube comprising: The lead pin is arranged to maintain a predetermined interval in the annular, The interval between the lead pin to which the static voltage is applied among the lead pins and the lead pin to which the dynamic voltage which is relatively higher than the static lead pin is applied is wider than that of the other lead pins. The pinhole includes a plurality of pinholes into which a lead pin to which a voltage is applied is inserted, another pinhole into which a common pin to be selectively applied is inserted, and another pinhole into which the lead pin and the common pin are not inserted together. Cathode ray stem. delete A stem body portion sealed to the neck end of the bulb, an exhaust pipe formed at the center of the stem body portion to provide an air passage when evacuating the bulb interior, and a pin hole selectively inserted into the pin hole formed in the stem body portion And a plurality of lead pins for applying a voltage to an electron gun consisting of a plurality of electrodes, the stem for a cathode ray tube comprising: The lead pins are arranged at regular intervals of the annular shape, Among the lead pins, a lead pin to which a static voltage is applied and a lead pin to which a dynamic voltage having a relatively higher voltage than that of the static lead are applied are separated from each other by one of the static lead pins and the dynamic lead pins. The stem for the inter-cathode, characterized in that for moving the position so as to be inserted into the pinhole in the opposite direction with respect to the other than the spacing between the lead pins. A stem body portion sealed to the neck end of the bulb, an exhaust pipe formed at the center of the stem body portion to provide an air passage when evacuating the bulb interior, and a pin hole selectively inserted into the pin hole formed in the stem body portion And a plurality of lead pins for applying a voltage to an electron gun consisting of a plurality of electrodes, the stem for a cathode ray tube comprising: The lead pin is arranged to maintain a predetermined interval in the annular, The interval between the lead pins to which the static voltage is applied among the lead pins and the lead pins to which the dynamic voltage is applied which is relatively higher than the static lead pins is constant between any one of the static lead pins and the dynamic lead pins. A cathode ray tube stem, which is positioned at an outer portion of another lead pin that is spaced apart, and disposed relatively wider than an interval between other lead pins. A stem body portion sealed to the neck end of the bulb, an exhaust pipe formed at the center of the stem body portion to provide an air passage when evacuating the bulb interior, and a pin hole selectively inserted into the pin hole formed in the stem body portion And a plurality of lead pins for applying a voltage to an electron gun consisting of a plurality of electrodes, the stem for a cathode ray tube comprising: The lead pin is arranged to maintain a predetermined interval in the annular, Among the lead pins, a gap between a lead pin to which a static voltage is applied and a lead pin to which a dynamic voltage having a relatively higher voltage than the static lead pin is applied is located at an outer portion of the other lead pins arranged in an annular shape, and thus, between the other lead pins. A cathode ray tube stem, which is disposed relatively wider than an interval. The method according to any one of claims 1, 3, 4, 5, If the annular diameter of the lead pin is 12 millimeters, the spacing between the lead pin is 3.4 millimeters, the spacing between the static lead pin and the dynamic lead pin is 5.0 millimeters or more.

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