KR100766919B1 - Cathode ray tube - Google Patents

Abstract

The present invention relates to a cathode ray tube in which the element effect is improved by designing an element coil appropriately to the shape of an inner shield. The cathode ray tube of the present invention is provided with first and second element coils respectively provided on upper and lower outer peripheral surfaces of the funnel around a neck portion. And first and second element coils each having a lower coil part disposed at a neck side in a long side direction of a face panel, wherein the lower coil part has an inner shield installed at a rear side of the color sorting device. It has the same shape as the upper and lower opening lines forming the central opening.

Element coil, opening, color screening, shadow mask, mask frame, inner shield,

Description

Cathode Ray Tube {CATHODE RAY TUBE}

1 is a rear perspective view showing the internal configuration of a cathode ray tube according to the present invention.

2 is a rear view of the cathode ray tube according to the present invention;

3 is a partial cross-sectional rear view of a cathode ray tube according to the present invention for showing a relationship between an inner shield and an element coil;

4 is a plan view of the cathode ray tube according to the present invention for showing the relationship between the explosion-proof band and the element coil.

TECHNICAL FIELD The present invention relates to a cathode ray tube, and more particularly, to an element coil provided to element metal parts such as a color screening device and an inner shield.

In general, metal parts are mounted inside the cathode ray tube, which includes a shadow mask having a plurality of electron beam through holes for separating three stem electron beams emitted from an electron gun into corresponding R, G, and B phosphors of a fluorescent screen. It includes a color screening device composed of a mask frame for holding and holding a shadow mask, and an inner shield mounted to the mask frame to shield the path of the electron beam emitted from the electron gun from the geomagnetic field.

However, the metal parts are magnetized by a geomagnetic field to form a magnetic field around them, and the magnetic field formed around the metal parts changes the path of the electron beam traveling through the cathode ray tube to reach the designated phosphor. There is a problem that the so-called mis-landing that can not be made, and the screen quality is degraded due to the mis-landing.

In order to solve this problem, a degaussing coil is typically attached to the bulb outer circumferential surface of the cathode ray tube, and the device coil is magnetized between the color screening device and the inner shield by a device current supplied for about 3 to 4 seconds each time the power is turned on. Remove the state.

As an example of the technology related to such element coils, Japanese Patent Laid-Open Nos. 5-283019, 5-260496 and 6-62419 have element coils formed in an approximately M shape in which the element coils are symmetric with each other at the upper and lower portions of the side wall of the cathode ray tube. A cathode ray tube arranged in a shape is disclosed.

By the way, the above-mentioned Japanese patents mainly design the shape and position of the device coil, mainly the metal parts (shadow mask and mask frame) inside the cathode ray tube and the shape and position of the explosion-proof band and ear outside the cathode ray tube. In this regard, the shape of the inner shield, which has the greatest influence on the moving direction of the electron beam, is not sufficiently considered. Therefore, the cathode ray tube of Japanese patents has a problem that the element effect by the element coil is not satisfactory.

Accordingly, the present invention has been made to solve the above problems, and an object thereof is to provide a cathode ray tube with an improved element effect by designing an element coil suitable for the shape of an inner shield.

The present invention to achieve the above object,

First and second element coils are respectively provided on the upper and lower outer peripheral surfaces of the funnel around the neck portion, and the first and second element coils each have a lower coil portion disposed on the neck portion in the long side direction of the face panel. The lower coil unit provides a cathode ray tube having the same shape as the upper and lower opening lines forming a central opening of an inner shield installed behind the color sorting device to the inside of the panel.

In implementing the present invention, an element coil is designed such that the length L1 of the upper and lower opening lines and the length L2 of the lower coil portion satisfy a relational expression of L1? L2. This is because, as the lower coil portion is formed longer than the upper and lower opening lines, the element area due to the element coil increases, thereby improving the element effect.

In addition, the device coil may be designed such that the distance D1 between the upper and lower opening lines and the distance D2 between the lower coil portions satisfy a relational expression of 0.7 ≤ (D2 / D1) ≤ 1.3. It can be designed to be disposed on the same horizontal line as the side opening line, that is, D1 and D2 have the same value.

In this case, since the element coil is formed in almost the same shape as the inner shield, the element effect is maximized.

The cathode ray tube is provided with a color screening device for screening the electron beam emitted from the electron gun to reach the fluorescent screen of the face panel. The color screening device of the present invention has a plurality of electron beam passing holes in the short side direction of the face panel. And a mask frame having a tensile mask applied with a tensile force, a pair of supporting members for supporting the long side of the tensile mask, and a pair of rigid members for integrally connecting the supporting members in the short side direction.

Of course, it is also possible to comprise the said color screening apparatus with the shaping | molding mask and the mask frame which supports this mask.

In the embodiment of the present invention, the inner opening of the inner shield is a pair of upper and lower openings formed in the long side direction of the face panel around the neck portion, and a pair of left and right connecting the upper and lower openings. The upper and lower opening lines and the left and right opening lines may be formed in a straight line or a bent straight line. Two side wall openings may be formed on the upper and lower sidewalls of the inner shield, respectively, above and below the center opening. Can provide.

The first and second element coils may include an upper coil part disposed on the long side skirt side of the face panel, a lower coil part formed in the same shape as the upper or lower opening line and disposed on the neck part in the long side direction, and Each of the left and right coil parts connecting the upper and lower coil parts may be formed, and the first and second device coils may be formed separately or integrally.                     

An explosion-proof band having an ear is usually mounted to the skirt portion of the panel. In this case, when the upper coil portions of the first and second element coils are disposed on the explosion-proof band, Since the device effect is increased, the device effect can be further improved.

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

Figure 1 shows a rear perspective view showing the internal configuration of the cathode ray tube according to the present invention, Figure 2 shows a rear view of the cathode ray tube according to the present invention, Figure 3 shows the relationship between the inner shield and the device coil. Some cross-sectional rear view of the cathode ray tube according to the present invention for the drawing is shown.

The cathode ray tube constitutes an outer shape of the bulb 18 in which the face panel 12, the funnel 14, and the neck portion 16 are integrally coupled, and the inside of the bulb 18 is sufficient to allow electrons to move freely. It is evacuated to a vacuum pressure of about 10 ^-7 to 10 ^-10 torr to maintain a high vacuum.

The face panel 12 includes a screen portion (not shown) in which a fluorescent screen 12 ′ is formed on an inner surface thereof, and a skirt portion (not shown) extending vertically from the four edges of the screen portion toward the funnel 14. . An electron gun 20 for emitting an electron beam toward the fluorescent screen 12 ′ is mounted inside the neck portion 16, and a deflection device for generating a magnetic field for deflecting the electron beam on the outer circumference of the funnel 16 (not shown) Is installed.                     

Further, inside the face panel 12, a color screening device 22 for separating the three stem electron beams emitted from the electron gun 20 into the corresponding R, G, and B phosphors of the fluorescent screen 12 'is provided. An inner shield 24 is fixed inside the shield 14 to shield the electron beam path from the geomagnetic field.

In the present embodiment, the color screening device 22 is composed of a tension mask 28 having a plurality of electron beam through holes 26, and a mask frame 30 fixedly supporting the mask 28. 28 is fixed to the support member 32 of the mask frame 30 in a state in which the face panel 12 is tensioned in the short side direction (Y-axis direction), and the support member 32 tensions the mask 28. It is connected by a pair of rigid members 34 to be kept in a state.

Here, the support member 32 and the rigid member 34 constitute a mask frame 30, the color screening device 22 composed of a tension mask 28 and the mask frame 30 is a mask frame 30 A coupling spring (not shown) attached thereto is detachably fastened to a stud pin (not shown) fixed to an inner surface of a skirt portion (not shown) of the face panel 12.

The inner shield 24 is fixed to the mask frame 30 so as to surround the electron beam path in the funnel 14, and the inner shield 24 includes a central opening 36 through which the electron beam passes, and It has a side wall 38 which projects the central opening 36 toward the neck portion 16.

The center opening 36 has a pair of upper and lower opening lines 36a and 36b formed in the long side direction (X-axis direction) of the face panel 12 with the neck portion 16 as the center, and the upper side and It is formed by a pair of left and right opening lines 36c and 36d connecting the lower opening lines 36a and 36b. The upper and lower opening lines 36a and 36b are straight lines parallel to the long side direction (X-axis direction). The left and right opening lines 36c and 36d are formed in a straight line in which the center side is bent toward the rigid member 34. Two side wall openings 40 are formed in the upper and lower side walls 38 of the inner shield 24, respectively, above and below the central opening 36.

However, since the color screening device 22 and the inner shield 24 having the above-described configuration are all made of a metal material, they are magnetized by the geomagnetic field to affect the electron beam. Therefore, an element coil is provided on the outer circumferential surface of the face panel 12 to element the color screening device 22 and the inner shield 24.

The present invention includes first and second element coils 42 and 44, which coils 42 and 44 are formed on the upper side of the funnel 14 around the neck portion 16 as shown in FIG. The outer peripheral surface of the lower side is installed respectively. In the present embodiment, the first and second element coils 42 and 44 are configured separately, but the coils 42 and 44 may be integrally formed.

The first and second element coils 42 and 44 are upper coil portions 42a and 44a disposed on a long side (X-axis direction) skirt (not shown) of the face panel 12, and upper or lower opening lines. Lower coil portions 42b and 44b formed in the same shape as that of 36a or 36b, i.e., in a straight line parallel to the long side direction, and arranged in the long side direction (X-axis direction) toward the neck portion 16, and the upper and lower sides. Consists of the left and right coil portions 42c connecting the coil portions 42a and 42b and 44a and 44b, respectively, and the lower coil portions 42b and 44b are installed in the funnel 14 facing each other. Accordingly, the first and second element coils 42 and 44 form a symmetrical structure in the vertical, vertical, horizontal directions.                     

In this case, when the length of the upper and lower opening lines 36a and 36b is L1 and the length of the lower coil portion 42b or 44b is L2, the first and second element coils 42 and 44 are lower. The length L2 of the coil part is formed to have a larger value than the opening line length L1. The length of the coil part 42a or 42b is longer than that of the upper and lower opening lines 36a and 36b, so that the element coil ( This is because the device area by 42,44) is increased to improve the device effect.

In the first and second element coils 42 and 44, the interval between the upper and lower opening lines 36a and 36b is D1, and the interval between the lower coil portions 42b and 44b is D2. The ratio D2 / D1 of the liver is formed within a certain range.

D1 (mm) D2 (mm) D2 / D1 EW (μm) NS (μm) EW + NS (μm)    140 100 0.71 9.75 15.50 25.25 120 0.86 8.25 15.00 23.25 140 1.00 7.75 16.00 23.75 160 1.14 8.00 16.75 24.75 180 1.29 7.75 17.00 24.75 200 1.43 9.00 18.50 27.50 220 1.57 10.00 17.75 27.75

Table 1 above measures the amount of landing change while increasing the distance between the lower coil parts 42b and 44b, where EW refers to the amount of landing change in the east (E) -west (W) direction by the geomagnetic field, and NS is south ( S)-refers to the amount of landing change in the north (N) direction.

However, according to the experiments of the present inventors, the conventional Japanese patents, that is, the cathode ray tube having the M-shaped element coil has a landing change amount of 9.6 μm in the east-west direction, and a landing change amount in the north-west direction of 20.10 μm, The total landing change (EW + NS) was 29.7 μm.

Therefore, referring to Table 1 above, in the range where the ratio D2 / D1 of the distance D1 between the upper and lower opening lines and the distance D2 between the lower coil portions is 0.7 or more and 1.3 or less, the device is compared with the conventional device coils. It can be seen that the effect is improved.

Meanwhile, an explosion-proof band 48 having an ear 46 is mounted to the skirt portion of the face panel 12. Here, the ear 46 refers to installation means for fixing the bulb 18 to a cabinet (not shown). As described above, in the cathode ray tube having the explosion-proof band 48 and the ears, the upper coil parts 42a and 44a of the first and second element coils 42 and 44 closely adhere to the ears 46 as shown in FIG. 4. It is arranged on the explosion-proof band 48 in the state. Of course, although the upper coil parts 42a and 44a may be arranged to the rear side of the explosion-proof band 48, in this case, since the element effect of the color screening device 22 by the element coils 42 and 44 is reduced, It is preferable to arrange the upper coil portions 42a and 44a on the explosion-proof band 48.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

As described above, in the cathode ray tube of the present invention, the lower coil portion of the element coil is formed in the same shape as the upper and lower opening lines of the inner shield, and the ratio of the interval D1 between the upper and lower opening lines and the interval D2 between the lower coil portions ( By arranging the first and second device coils so that D2 / D1) is within the range of 0.7 or more and 1.3 or less, there is an effect that the device effect can be improved as compared with the prior art.

Claims (11)

First and second element coils are respectively provided on the upper and lower outer peripheral surfaces of the funnel around the neck portion, and the first and second element coils each have a lower coil portion disposed on the neck portion in the long side direction of the face panel. And the lower coil part has the same shape as the upper and lower opening lines forming a central opening of an inner shield provided behind the color sorting device to the inside of the panel. The cathode ray tube according to claim 1, wherein the length of the upper and lower opening lines is L1, and the length of the lower coil portion is L2. L1 ≤ L2 The cathode ray tube according to claim 1 or 2, wherein the gap between the upper and lower opening lines is D1, and the gap between the lower coil portions is D2, and the following relational expression is satisfied. 0.7 ≤ (D2 / D1) ≤1.3 The cathode ray tube according to claim 3, wherein the lower coil portion is disposed on the same horizontal line as the upper and lower opening lines. The apparatus of claim 3, wherein the color screening apparatus comprises: a tension mask having a plurality of electron beam through holes and a tensile force applied in a short side direction of a face panel; a pair of support members for supporting the long sides of the tension mask; A cathode ray tube comprising a mask frame having a pair of rigid members that integrally connect members in a short side direction. The center opening of the inner shield is a pair of upper and lower openings formed in the long side direction of the face panel around the neck and a pair of left and right openings connecting the upper and lower openings. Cathode ray tube formed by. 7. The cathode ray tube of claim 6, wherein two sidewall openings are provided on upper and lower sidewalls of the inner shield, respectively, above and below the central opening. 4. The coil of claim 3, wherein the first and second element coils are formed in the same shape as the upper coil portion disposed on the long side skirt side of the face panel and the upper or lower opening line, and the lower side disposed in the long side direction on the neck portion. Cathode ray tube each consisting of a coil portion and the left and right coil portions connecting the upper and lower coil portions. The cathode ray tube according to claim 8, wherein the first and second element coils are separated. The cathode ray tube of claim 8, wherein an explosion-proof band having an ear is mounted in a skirt of the panel. The cathode ray tube of claim 10, wherein upper coil parts of the first and second device coils are disposed in the explosion-proof band, respectively.

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