JPH041984B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color cathode ray tube in which a shadow mask and an inner graphite provided in a funnel are provided with a contact spring.

A conventional color cathode ray tube has a structure as shown in FIG. A support spring 2 fixed to the shadow mask 1 is fitted into a panel pin 4 implanted in a panel 3, whereby the shadow mask 1 is held on the inner surface of the panel 3 at a predetermined distance. Further, in order to connect the shadow mask 1 and the fluorescent surface on the inner surface of the panel to an anode power source, a contact spring 7 is used to establish electrical continuity between the interior graphite 6 provided in the funnel 5 and the shadow mask 1. One end of the contact spring 7 is fixed by welding to a magnetic inner shield 9 fixed to a support frame 8 that reinforces the shadow mask 1, and the other end is crimped to the inner graphite 6. In addition, in the figure, 10 indicates an electron shield.

In this way, the contact spring 7 is fixed in contact with the magnetic inner shield 9, and since the magnetic inner shield 9 has low rigidity and is easily vibrated, vibrations may occur in the support frame 8 and the magnetic inner shield 9 during transportation. In this case, this vibration is transmitted to the contact spring 7, and the inner graphite 6 is scraped by the contact spring 7. Another drawback was that when this scraped graphite powder reached the vicinity of the electron gun, the withstand voltage characteristics were significantly impaired. Further, since the contact spring 7 is fixed by welding, welding splash is generated when the contact spring is attached, which may damage the luminescent surface, or the welding splash may come loose after the real ball is completed, degrading the withstand voltage characteristics.

SUMMARY OF THE INVENTION Accordingly, a first object of the present invention is to provide a color cathode ray tube in which contact springs do not cause scraping of internal graphite.

A second object of the present invention is to provide a color cathode ray tube in which contact springs can be fixed without using welding means.

Hereinafter, the present invention will be explained with reference to illustrated embodiments.

FIG. 2 is a schematic cross-sectional view showing an embodiment of a color cathode ray tube according to the present invention, FIG. 3 is a front view of the main part, FIG. 4 is a detailed enlarged view of the main part of FIG. 3, and FIG. It is a sectional view taken along the line AA in the figure. Note that the same members as in FIG. 1 are designated by the same reference numerals, and their explanations will be omitted. In the support spring 11, a fitting part 11b is formed by cutting and bending a fixed part 11a fixed to the shadow mask 1. Further, one end of the contact spring 12 is formed with a spherical curved part 12a that presses against the interior graphite 6, and the other end is formed with an insertion part 12b that is inserted into the fitting part 11b of the support spring 11.
is formed. The insertion portion 12b is cut and raised on both sides to form a stopper portion 12c so as to engage with the upper end of the fitting portion 11b of the support spring 11, and the center portion of the insertion portion 12b is cut and raised in a U-shape. A press-contact portion 12d having a spherical tip and press-contacted to the support spring 11 is formed.

Therefore, in order to attach the contact spring 12 to the support spring 11, when the insertion part 12b is inserted into the fitting part 11b, the stopper part 12c engages with the upper end of the fitting part 11b and cannot be removed, and the contact spring 12 is attached to the support spring. It is fixed at 11. Further, the pressure contact portion 12d is in pressure contact with the fitting portion 11b, and the contact spring 12 and the support spring 11 are electrically connected. However, since electrical continuity due to pressure contact between spring materials is unreliable, paint made of graphite and water glass or silver paste is applied to the pressure contact portion 12d or the portion of the fitting portion 11b corresponding to the pressure contact portion 12d. The reliability of electrical continuity can be increased by placing the

Therefore, when the shadow mask 1 vibrates while being assembled into the panel 2, the part whose relative position with respect to the panel 2 or the funnel 5 changes the least is the support spring 11 fitted to the panel pin 4, and this support spring Since the contact spring 12 is fixed to the contact spring 11, the transmission of vibration to the contact spring 12 is small, and the contact spring 12 is prevented from scraping the internal graphite. Further, since the contact spring 12 is fixed by simply inserting it into the support spring 11 at the end, workability is excellent and problems caused by welding splash caused by conventional welding are also eliminated.

FIG. 6 shows another embodiment of the invention. In this embodiment, the panel pin attachment portion 11c of the support spring 11 is
A fitting part 11b is formed in the fitting part 11b, and a contact spring 12 is attached to this fitting part 11b.Since the contact spring 12 is attached to the position closest to the panel pin 4, the connection with the panel 3 is smaller than in the previous embodiment. Relative position fluctuations are even smaller. However, in reality, it may be difficult to attach the contact spring 12 to the panel pin attachment portion 11c due to workability. Therefore, in practice, since the fixing part 11a to the shadow mask 1 is also located at a position where the vibrational displacement of the shadow mask 1 with respect to the valve is small, it is preferable to attach it to the fixing part 11a as in the above embodiment.

FIG. 7 shows yet another embodiment of the invention. This embodiment is an example in which the support spring 13 is applied to a support spring 13 having a different configuration, and the support spring 13 has a bimetal portion 13.
a and a spring portion 13b.
In such a support spring 13, the contact spring 12 may be attached to a fitting portion 13c formed on the bimetal portion 13a as shown in the figure, or to a fitting portion formed on the spring portion 13b (not shown).

In each of the above embodiments, the case where the contact spring 12 is attached to the support springs 11 and 13 has been described, but the support spring 1
It may be attached to a portion of the support frame 8 near 1 and 13. Furthermore, the fitting parts 11b and 13c of the support springs 11 and 13 are not formed by cutting and bending, but also by fixing separate members to the support springs 11 and 13 in advance to form a gap into which the insertion part 12b of the contact spring 12 can be inserted. good.

As is clear from the above description, according to the color cathode ray tube according to the present invention, since the contact spring is attached to the support spring or the support frame near the support spring, scraping of the internal graphite can be prevented. Further, since the contact spring is fixed to the support spring etc. by simply inserting it, the workability is excellent and problems caused by welding splash do not occur.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a conventional color cathode ray tube, FIG. 2 is a schematic sectional view of an embodiment of the color cathode ray tube according to the present invention, FIG. 3 is a front view of the main parts of FIG. The figure is a detailed enlarged view of the main part of FIG. 3, FIG. FIG. 7 is a front view of main parts showing still another embodiment of the invention. 1...Shadow mask, 3...Panel, 4...
Panel pin, 5... funnel, 6... interior graphite, 8... support frame, 11... support spring, 11b... fitting part, 12... contact spring, 12b... insertion part, 12c... stopper part, 12d... Pressure contact part, 13... Support spring, 13c... Fitting part.

Claims (1)

[Claims] 1. A supporting spring fixed to the shadow mask is fitted to a panel pin implanted in the panel to hold the shadow mask within the panel, and the shadow mask and the inner graphite provided in the funnel are connected by contact springs. In a color cathode ray tube that is connected to the support spring, a fitting part is provided in the vicinity of the support spring of the support frame that reinforces the support spring or the shadow mask, and the contact spring is provided with an insertion part that is inserted into the fitting part. . A color cathode ray tube, in which the insertion portion is inserted into the fitting portion and the contact spring is fixed to the support spring or the support frame. 2. The insertion portion includes a stopper portion that prevents the insertion portion from coming off after the insertion portion is inserted into the fitting portion;
The color cathode ray tube according to claim 1, further comprising a press-contact portion that presses against the fitting portion. 3. The color cathode ray tube according to claim 2, wherein a conductive material is applied to the press-contact portion or a portion of the fitting portion that is press-contacted by the press-contact portion.