KR20010110113A - Slim tube funnel design with improved funnel - Google Patents

Abstract

The cathode ray tube according to the invention comprises a glass envelope comprising a faceplate panel, a neck end and a funnel connected between the faceplate panel and the neck end. The funnel has a body portion and a yoke region, wherein the body portion includes one or more reinforcing ribs. The reinforcing rib has a curved ridge bent portion that is bent outward from its vacuum side on the funnel. Alternatively, the reinforcing ribs comprise thick thick portions of the funnel in the form of curved hills. The curved thick thick portion may face inward towards the vacuum side, outward towards the opposite side of the vacuum side, or both sides. The reinforcing ribs may extend along the funnel from the neck end to the faceplate direction, may extend in a direction intersecting the direction from the neck end to the faceplate, or may extend in combination of the two directions.

Description

SLIM TUBE FUNNEL DESIGN WITH IMPROVED FUNNEL}

The present invention relates to the field of cathode ray tubes, and more particularly, to the funnel portion of the cathode ray tube.

The design of flat cathode ray tubes required a change in the design of glass envelope components used in display tubes. For example, flat cathode ray tubes required an increase of at least 1 inch in the thickness of the glass at the center of the front faceplate panel. Also, the design of another cathode ray tube, known as a "slim" cathode ray tube, imposes restrictions on the additional stress on its funnel portion. The slim cathode ray tube substantially reduces the axial depth of the cathode ray tube, particularly at the funnel portion, compared to conventional water tubes.

Flattening the front panel and reducing the axial depth of the cathode ray tube requires increasing the glass thickness of the cathode ray tube to accommodate additional mechanical stress. Although increased glass thickness has been accepted industrially and practiced, efforts have been made to reduce the amount of glass required for cathode ray tube envelopes. The funnel portion of the cathode ray tube has always accounted for about 50% of the weight of the cathode ray tube, but the funnel portion is much thinner than the faceplate panel in cross section because of its greater curvature. It is adjusted to consider the strength and safety of the structure

In slim cathode ray tubes, the electron beam must be scanned at a larger deflection angle compared to conventional cathode ray tubes. For example, conventional cathode ray tubes can have a deflection angle of up to approximately 110 degrees, whereas slim cathode ray tubes have a much larger deflection angle. As the depth of the cathode ray tube decreases, the electron gun is located closer to the front faceplate panel of the cathode ray tube, so a larger deflection angle is required. Reduction of the cathode ray tube depth is achieved by significantly shortening the funnel portion and / or panel portion of the cathode ray tube in the axial direction. As the funnel depth decreases, the stress of the funnel glass generated by the vacuum load increases. Increased stress makes the cathode ray tube envelope weaker. The force exerted on the surface area of the funnel, including the yoke portion, increases to make it difficult to process the funnel after frit application and exhaust cycles. In addition, the glass area of the funnel may be a breakdown point in the wave test. It is economically desirable to provide a cathode ray tube with minimal weight and with reduced depth, but the limits on stress and safety still have to be met.

The present invention is directed to reinforcing rib features in the glass funnel structure of the cathode ray tube. Rib features minimize the weight of the cathode ray tube while increasing the cathode ray tube's ability to withstand the forces resulting from vacuum loads, manufacturing processes, and safety testing. The present invention is particularly useful for slim cathode ray tube designs, or cathode ray tubes having a large deflection angle and having a reduced depth of about 3-4 inches between the front faceplate and neck compared to the depth of conventional water tubes.

1 is a side view of a cathode ray tube.

2-6 are cross-sectional views of rib features of the present invention in cathode ray tube glass.

7-8 are side views of the cathode ray tube envelope showing exemplary positions and orientations for the rib features of the present invention of FIGS.

9 is a rear view of the line 9-9 of FIG. 8;

<Explanation of symbols for main parts of the drawings>

10: glass envelope

11: faceplate panel

12: funnel

12 ': main body

12 ": York area

13: neck

21: vacuum side

22: waiting side

24, 25, 26, 27: bend transition

43, 53, 63: thick rib

The cathode ray tube according to the invention comprises a glass envelope comprising a faceplate panel, a neck end and a funnel connected between the faceplate panel and the neck end. The funnel has a body portion and a yoke region, wherein the body portion includes one or more reinforcing ribs. The reinforcing rib has a curved ridge bent portion that is bent outward from its vacuum side on the funnel. Alternatively, the reinforcing ribs comprise thick thick portions of the funnel in the form of curved hills. The curved thick thick portion may face inward towards the vacuum side, outward towards the opposite side of the vacuum side, or both sides. The reinforcing ribs may extend along the funnel from the neck end to the faceplate direction, may extend in a direction intersecting the direction from the neck end to the faceplate, or may extend in combination of the two directions.

In each figure, similar parts are denoted by like reference numerals.

1 shows a cathode ray tube with a glass envelope 10 comprising a face plate and tubular neck 13 connected by a funnel. The funnel 12 includes a body portion 12 ′ and a yoke region 12 ″ enclosed in the neck 13. A plurality of reinforcing ribs 23 are located at the body portion 12 ′ of the funnel 12. In a conventional cathode ray tube, the glass sidewalls of the yoke region 12 "make the yoke region 12" thick enough to accommodate higher tensile stress. 12 "), it is a reasonable area to remove the glass and achieve substantial glass reduction. Therefore, thinning the glass of the body portion 12 'requires reinforcement against tensile stress. The rib 23 shown is oriented longitudinally from the neck 13 along the body portion 12 'to the faceplate panel 11 in the front. Reference to ribs 23 is merely illustrative. Other structures of ribs 33, 43, 53, 63 may be employed alone in the funnel or in combination with each other.

2-6, cross-sectional views of different reinforcing rib structures are shown. In the rib 20, the detailed structure of which is shown in the cross-sectional view of FIG. 2, a curved ridge of glass with the outer reinforcing rib 23 of the glass facing outward from the vacuum side 21 toward the outer or atmospheric side 22 of the funnel. It is formed by the bent portion. Preferably, the curved transition portions 24-27 in the rib 23 are gently curved as opposed to the sharp angle change portion where the stress due to the vacuum load is concentrated. The rib 30, shown in detail in the cross-sectional view of FIG. 3, shows an inverted ridge bend 33 that is bent inward toward the vacuum side 21 of the glass, on the opposite side to the atmospheric side 22.

In the rib 40 in which the detailed structure is shown in the cross-sectional view of FIG. 4, the rib 43 is a funnel of a hill shape or a curved protrusion that protrudes toward the vacuum side 21 inwardly to the opposite side to the atmospheric side 22. It is formed as a thick thick portion of glass. In the rib 50, the detailed structure of which is shown in the cross-sectional view of FIG. 5, the rib 53 is in the form of a hill or a curved protrusion protruding outward toward the atmospheric side 22 of the funnel on the opposite side to the vacuum side 21. It is formed as a thick thick portion of the funnel glass. Finally, in the rib 60, the detailed structure of which is shown in the cross-sectional view of FIG. 6, the rib 63 has a hill that protrudes toward both the inner or vacuum side of the funnel glass and the outer or atmospheric side 21, 22 of the funnel glass. Thick thick portions in the form or protrusions are formed.

Further exemplary positions and orientations of the reinforcing rib features of FIGS. 2-6 on the funnel portion of the cathode ray tube are shown in FIGS. 7-9. Each of the various structures of ribs 23, 33, 43, 53, 63 may be employed alone or in combination with the funnel. For example, ribs 23 and 43 may be simultaneously located in different locations on the same funnel glass.

In the cathode ray tube 70 of FIG. 7, the ribs 23 face in the direction intersecting the longitudinal direction of the funnel surface. In the cathode ray tube 80 of FIG. 8, there are ribs 23 ′ facing the longitudinal direction along the funnel surface, and ribs 23 facing the direction crossing the longitudinal direction of the funnel surface. As shown in the rear view 90 of FIG. 9 taken along line 9-9 of FIG. 8, the longitudinally facing ribs 23 ′ and the laterally facing ribs 23 are in the form of exemplary wheels and spokes. Although configured, other interconnected rib shapes can also be used.

The reinforcing ribs on the funnel glass surface described above not only allow the cathode ray tube to withstand the loads applied during the manufacturing process and testing, but also make the funnel stronger and more resistant to impact and vacuum loads. The finite element method (FEA), which is a stress model of a cathode ray tube with ribs incorporated in a funnel, has shown that the stress due to vacuum load decreases.

The curvature of a typical cathode ray tube funnel portion acts to cause the force acting on the glass funnel to induce maximum stress or maximum strain in the direction of the glass surface. In slim cathode ray tube designs where the depth between the front panel 11 and the neck 13 is reduced, the curvature of the funnel is reduced, which tends to concentrate stress on the parts of the funnel whose angle or direction changes to the maximum. As the cathode ray depth decreases, more bending stresses are induced on the portions of the less curved funnel. The deformation of the cathode ray tube glass due to the vacuum load is due to the tensile properties.

Reducing deformation can be achieved by the rib features of the present invention shown in FIGS. 2-6 of the funnel. For example, if the tensile stress induced by vacuum is 1500 psi, incorporating the ribs into the funnel glass can reduce the tensile stress to a level below 1000 psi, which is satisfactory and safe.

Reinforcing ribs of the present invention, properly positioned on the funnel surface of the cathode ray tube, increase the ability of the cathode ray tube to withstand the forces generated by vacuum loads, manufacturing processes, and safety tests. Rib features require a minimum of additional glass to achieve additional glass strength.

While the invention has been described in connection with specific examples, it will be apparent to those skilled in the art that modifications and variations can be made in the disclosed embodiments without departing from the spirit of the invention. Accordingly, in determining the true scope of the present invention, it should be based on the appended claims rather than the foregoing specification.

Claims (9)

A cathode ray tube with a glass envelope (10), A faceplate panel 11; Neck end 13; Funnel 12 connected between panel 11 and neck end 13 Wherein the funnel has a body portion (12 ′) and a yoke region (12 ″), the body portion comprising one or more reinforcing ribs (23). The cathode ray tube according to claim 1, wherein the reinforcing rib includes a curved ridge bent portion (33) curved inwardly toward the vacuum side (21) of the funnel. The cathode ray tube according to claim 1, wherein said reinforcing rib includes a curved ridge bent portion (23) bent outwardly on the funnel to the side opposite to the vacuum side (21). The cathode ray tube according to claim 1, wherein the reinforcing rib includes a thick thick portion (43, 53, 63) in which the thickness of the funnel is increased in the shape of a curved hill. 5. The cathode ray tube according to claim 4, wherein the hill-shaped thick thick portion (53) faces the atmospheric side of the funnel. The cathode ray tube according to claim 1, wherein the reinforcing rib includes a thick thick portion (63) having a hill shape in which the thickness of the funnel increases toward both the inside and the outside of the funnel. The cathode ray tube according to claim 1, wherein said reinforcing rib (23) extends along said funnel from said neck end toward said faceplate panel. The cathode ray tube according to claim 1, wherein said reinforcing rib (23) extends along said funnel in a direction intersecting with a direction from said panel to said neck end. The method of claim 8, wherein a first reinforcing rib (23) of the plurality of reinforcing ribs (23) extends along the funnel from the panel toward the neck end, and the remaining plurality of the reinforcing ribs (23 ') And a cathode ray tube extending along the funnel in a direction crossing the direction of the first reinforcing rib.