KR19980059802U - Contact spring structure of color cathode ray tube - Google Patents

Abstract

The present invention relates to a contact spring structure of a color cathode ray tube, and in particular, it prevents a decrease in contact strength between internal graphite and the contact spring applied to the inner wall of the funnel, thereby preventing electrical conduction defects and improving the quality of the color cathode ray tube. The purpose is to improve the working efficiency of the system.

In order to realize this, the present invention is provided with beads formed at the interruption portions of the contact springs, which serve as timely conduction between the internal graphite and the mask and the frame.

Description

Contact spring structure of color cathode ray tube

The present invention relates to a color cathode ray tube, and more particularly, to a contact spring, which serves as an electrical conduction between internal graphite and a mask and a frame for applying a high voltage to a shadow mask.

A general color cathode ray tube includes a panel 1 having a fluorescent surface 4 coated on its inner side as shown in FIG. 1, and a funnel 2 that is coupled to a rear surface of the panel 1 to maintain an interior in a vacuum state. An inner shield assembled in the frame 7 to block an external magnetic field acting on the electron gun 6, which is embedded in the neck of the funnel 2 and emits an electron beam 6; 9), a shadow mask 3 coupled to the frame 7 to select the color of the electron beam, a spring 8 for fixing the frame structure to the panel 1, and an outer side of the funnel 2; The deflection yoke (5) for deflecting the electron beam, the reinforcing band (11) surrounding the side of the panel (1) to prevent the deflation of the cathode ray tube due to external impact, and the electron beam (6) are exactly 2, 4, 6-pole magnet 10 for modifying the trajectory to strike the phosphor, and the funnel Contact springs for applying high voltage to the shadow mask 3 by electrically conducting the internal graphite 13 and the external graphite applied to the inner and outer surfaces of (2), and the internal graphite 13 and the frame 7 electrically. It consists of (12).

In the color cathode ray tube configured as described above, the electron beam 6 strikes the fluorescent surface 4 formed on the inner surface of the panel 1 from the electron gun embedded in the neck of the funnel 2 to reproduce the color image. ) Is deflected up, down, left and right by the deflection yoke 5 before reaching the fluorescent surface 4 to form a screen.

On the other hand, the conventional color cathode ray tube is applied to the anode by applying a high voltage (30KV) through the built-in graphite coated on the inner wall of the funnel and the contact spring of the shape as shown in Figure 3 to deliver a high voltage to the shadow mask and the fluorescent surface emitted from the electron gun The electron beam is accelerated by the potential difference to reach the fluorescent surface and strikes the fluorescent surface 4 applied to the inner wall of the panel to reproduce the color image.

Therefore, the contact strength between the embedded graphite and the contact springs applied to the inner wall of the funnel is required to ensure electrical conduction.

However, since the contact spring is made of a thin metal (thickness: 0.13 mm), bending occurs while passing through the heat treatment process (400 ° C.) of the color cathode ray tube manufacturing process, and the contact spring is moved in the direction of the arrow as shown in FIG. The contact strength of the contact portion (A) between the embedded graphite and the contact springs applied to the inner wall is lowered, resulting in a poor electrical conduction in the shadow mask, so that the screen of the cathode ray tube cannot be displayed.

In addition, increasing the thickness of the contact spring in order to strengthen the strength of the contact spring also had a problem that the material cost increases and the work efficiency is lowered.

The present invention aims to increase the contact strength between the contact spring and the embedded graphite applied to the inner surface of the funnel by forming a bead at the stop of the contact spring to solve this problem.

1 is a structural diagram of a general color cathode ray tube.

Figure 2 is a detailed view of the contact portion of the built-in graphite and contact spring.

3 is a structural diagram of a conventional contact spring.

Figure 4 is a structural diagram of the subject innovation contact spring.

*** Explanation of symbols for the main parts of the drawing ***

1 panel 2 funnel

3: shadow mask 7: frame

12,22: Contact spring 13: built-in graphite

23: Bead

The present invention will be described in detail below with reference to the accompanying drawings.

Looking at the structure of the contact spring 22 of the present invention to increase the bending strength by forming a bead (23) in the portion B is the weakest bending strength of the contact spring to increase the bending strength.

In other words, the bead 23 is formed in a portion having a weak bending strength while maintaining the thickness without change, and the contact strength between the embedded graphite and the contact spring applied to the inner wall of the funnel by the heat treatment process or external impact of the color cathode ray tube manufacturing process It is possible to solve the electrical conduction defect in the shadow mask by preventing the degradation.

As described above, the contact spring structure of the present invention prevents electrical conduction defects by preventing contact strength degradation between the inner graphite and the contact springs applied to the inner wall of the funnel, which is a major failure factor of the color cathode ray tube, thereby improving the reliability of the product. It can be effected.

Claims (1)

A panel coated with a fluorescent surface on an inner surface, a shadow mask coupled to the inside of the panel, a frame supporting the shadow mask to maintain a predetermined distance from the panel, and coupled to a rear end of the frame to shield the geomagnetic field. An inner shield, a funnel coupled to the rear end of the panel to which internal graphite is applied, a reinforcing band surrounding the outer surface of the panel, a contact ring for electrically connecting the internal graphite of the funnel, the mask and the frame; In the color cathode ray tube which is composed of an electron gun encapsulated in the neck portion of the funnel to emit an electron beam of R, G, B, A contact spring structure of a color cathode ray tube, characterized in that a bead is formed in the middle portion of the contact spring to increase the contact strength between the contact spring and the embedded graphite.