KR19990030295U - Front case for cathode ray tube - Google Patents

Abstract

Disclosed is a front case for a cathode ray tube. The disclosed cathode ray tube front case is formed to have a predetermined curvature and includes a curvature portion surrounding the panel front portion of the cathode ray tube, an extension portion extending from the curvature portion and surrounding the panel side portion, and the curvature portion may contact the panel front portion. In this case, at least one pair of ribs which elastically deform the curvature portion in contact with both side surfaces of the panel so that the curvature radius of the curvature portion corresponds to the curvature radius of the panel front portion is formed at positions corresponding to both side surfaces of the panel. .

Description

Front case for cathode ray tube

The present invention relates to a front case for a cathode ray tube, and more particularly, to an improved front case for a cathode ray tube so that no floating portion occurs between the cathode ray tube panel portion.

Cathode ray tubes are used in various electronic parts such as televisions and monitors as display devices for realizing a predetermined image by deflecting an electron beam emitted by an electron gun in a predetermined direction to emit pixels of a fluorescent surface formed on the panel. However, since such a cathode ray tube is structurally fragile, it is usually surrounded by a case of a predetermined shape and protected from the outside.

1 is a perspective view illustrating a cathode ray tube installed in a conventional cathode ray tube front case. As shown in the figure, this cathode ray tube front case 16 has a curvature portion 14 surrounding the front portion 11 of the panel 13 of the cathode ray tube, and extends from the curvature portion 14 and the panel side portion ( 12, an extension 15 is provided. The cathode ray tube front case 16 is usually manufactured by an injection process, and deformation occurs in the manufacturing process, and thus a curvature of the curvature 14 does not coincide with the curvature of the panel front 11. . As a result, a floating portion is generated between the panel front portion 11 and the curvature portion 14 to cause a defect of the finished product.

FIG. 2 is a cross sectional view taken along the line II-II of FIG. 1, showing a coupling structure of the panel 13 and the front case 16 for the cathode ray tube. As shown in the figure, the coupling of the panel 13 to the cathode ray tube front case 16 includes a first fastening portion 21 formed on the panel side portion 12 and a second formed on the inner circumferential surface of the extension portion 15. The fastening portion 22 is screwed through the threaded portion (23). At this time, due to the problems described above, the lifting portion is generated by a predetermined distance A between the panel front portion 11 and the curvature portion 14. In the related art, in order to eliminate the lifting portion as much as A, the clearance between the first fastening portion 21 and the second fastening portion 22 is provided as much as B, which is larger than the gap of A, to provide the first fastening portion 21. And when adjusting the screwing of the second fastening portion 22 to minimize the lifting portion.

However, the coupling structure described above has a limit to prevent the lifting portion from occurring between the panel front portion 11 and the curvature portion 14. In detail, the floating portion generated between the panel front portion 11 and the curvature portion 14 may occur when the curvature radius of the curvature portion 14 is smaller than the curvature radius of the panel front portion 11 and is larger than that. This will be described separately.

3 to 4 illustrate contact portions of the panel front portion 11 and the curvature portion 14 in the structure of FIG. 1, and FIG. 3 illustrates a curvature portion (rather than the curvature radius 31 of the panel front portion 11). 14 is a case where the radius of curvature 32 is large, and FIG. 4 is a case where the radius of curvature 41 of the front panel portion 11 is larger than the radius of curvature 42 of the curvature portion 14. As shown in FIG. 3, when the curvature radius 32 of the curvature portion 14 is larger than the curvature radius 31 of the panel front portion 11, the lift portion does not occur at the center and the lift portion occurs at the edge. In this case, as shown in FIG. 2, by adjusting the gap B formed between the first fastening portion 21 and the second fastening portion 22, it is possible to prevent the lifting portion of the edge. However, as shown in FIG. 4, when the radius of curvature 41 of the front panel portion 11 is greater than the radius of curvature 42 of the curvature portion 14, a lifting portion is generated in the center. There is a problem in that the lifting portion cannot be prevented by adjusting the clearance gap formed between the first fastening portion 21 and the second fastening portion 22. As a result, even after the assembly of the panel 13 and the cathode ray tube front case 16 is completed, there is a lifting part between the panel front part 11 and the curvature part 14, so that the reliability of the product becomes worse.

The present invention has been made in view of the above problems, and an object thereof is to provide an improved front case for a cathode ray tube to prevent the lifting portion generated between the front panel and the curvature.

1 is a partial ablation perspective view showing a cathode ray tube installed on a conventional cathode ray tube front case;

2 is a cross-sectional view taken along the line II-II of FIG. 1;

3 and 4 are views showing the contact portion of the front panel portion and the curvature of Figure 1,

5 is a partial ablation perspective view showing a front case for a cathode ray tube according to the present invention,

And, Figure 6 is a view showing a state in which the cathode ray tube is fastened to the cathode ray tube front case according to the present invention.

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

11,51 Panel front part 12,52 Panel side part

13,53 Panel 14,54 Curvature section

15,55.Extension 21.First Connection

22.Second tightening part 23.Screw part

57 rib

In order to achieve the above object, the present invention is formed in a predetermined curvature, and includes a curvature portion surrounding the panel front portion of the cathode ray tube, and an extension portion extending from the curvature portion and surrounding the panel side portion in the front case for a cathode ray tube The panel may include at least one pair of ribs in contact with both sides of the panel to elastically deform the curvature so that the curvature of the curvature corresponds to the curvature of the panel. Characterized in that the position corresponding to both sides of the.

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

Figure 5 is a partial ablation perspective view showing a front case for a cathode ray tube according to the present invention.

As shown in the figure, the cathode ray tube front case 56 according to the present invention is formed with a predetermined curvature and the curvature portion 54 surrounding the panel 53, the front portion 51 of the cathode ray tube, and the curvature portion ( An extension 55 extending from 54 and surrounding the panel side portion 52. In addition, according to the features of the present invention, the curvature radius of the curvature portion 54 in contact with both sides of the panel 56 when the curvature portion 54 is in contact with the panel front surface 51 on the inner peripheral surface of the extension portion 55 At least one pair of ribs 57 which elastically deform the curvature portion 54 to correspond to the radius of curvature of the panel front surface portion 51 are formed at positions corresponding to both side surface portions 52 of the panel 56.

And, the pair of ribs 57 are positioned on the extension line in the longitudinal direction in which the curvature portion 55 and the panel front surface portion 51 are in contact with each other, as shown by the dotted lines in the figure. The pair of ribs 57 may be formed in plural so as to be in contact with both sides of the panel 52 corresponding to each other. And, the rib 57 is formed integrally from the inner peripheral surface when the front case for the cathode ray tube according to the present invention is formed by injection. And, Figure 6 shows a state in which the cathode ray tube is fastened to the cathode ray tube front case according to the present invention. As shown in the figure, the panel side portions 52 are in contact with the ribs 57 so that the panel side portions 52 can gradually transmit a force to the ribs 57 when inserted between the pair of ribs 57. The surface to be formed is inclined at a predetermined angle. The inclination angle is formed such that the curvature radius of the panel front part 51 coincides with the curvature radius of the curvature part 54 when the panel 13 is inserted and the panel front part 51 contacts the curvature part 54. do.

Looking at the operation of the cathode ray tube front case according to the present invention as described above are as follows.

First, as shown in FIG. 6, when the panel 53 is installed in the cathode ray tube front case according to the present invention, the panel side surfaces 52 are inserted while pushing a pair of corresponding ribs 57, respectively. At this time, since the surface 57a of the rib 57 which the panel side surface portion 52 contacts is formed to be inclined at a predetermined angle, the rib 57 is gradually forced in the direction of the arrow A. In this way, as the panel side portion 52 is inserted into the rib 57 while applying a force in the direction of arrow A, the curvature 54 acts in the direction of arrow B shown in the figure, thereby causing the curvature of the curvature 54. The shape is deformed so that the radius of curvature of the curvature 54 is close to the radius of curvature of the panel front surface 51. Therefore, when the insertion of the panel side portion 52 is completed between the pair of ribs 57, the curvature radii of the panel front portion 51 and the curvature portion 54 coincide, and thus the panel front portion 51 and the curvature portion There is no lifting part in the contact area of (54).

The front case for a cathode ray tube according to the present invention has at least one pair of ribs which elastically deform the curvature part so that the curvature part of the curvature part contacts the both sides of the panel so that the curvature part of the curvature part corresponds to the curvature radius of the panel front part when the curvature part contacts the panel front part. Since the curvature is completely in close contact with the panel front part in the state where the installation of the panel is completed, the reliability of the product is improved.

Claims (2)

In the front case for a cathode ray tube formed of a predetermined curvature and including a curvature portion surrounding the front panel portion of the cathode ray tube, and extending from the curvature portion and surrounding the panel side portion, When the curvature is in contact with the front surface of the panel, at least one pair of ribs which elastically deform the curvature of the curvature so that the curvature of the curvature of the curvature corresponds to the curvature of the curvature of the panel is opposite to both sides of the panel. Cathode ray tube front case, characterized in that formed in a position corresponding to the. The method of claim 1, The pair of ribs is the front case for a cathode ray tube, characterized in that located on the extension line in the longitudinal direction of the curvature.