JPS58913Y2 - cathode ray tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cathode ray tube, and more particularly to a contact spring for a color picture tube.

Generally, a cathode ray tube, particularly a color picture tube, has the configuration shown in FIG.

In the figure, a phosphorescent surface 2 is attached to the inner surface of a panel of a glass bulb 1, and a shadow mask 3 is arranged at a certain distance from the phosphorescent surface 2.

Furthermore, graphite 5, which is electrically connected to the cavity 4, is coated on the inner surface of the funnel of the glass bulb 1.

A contact spring 6 is attached to the shadow mask 3 in order to bring the graphite 5, the shadow mask 3, and the fluorescent surface 2 to the same potential.

Furthermore, the shadow mask 3 and the fluorescent surface 2 are electrically connected via pins 7 that support the shadow mask 3.

In this case, a contact spring 6 for electrically connecting the shadow mask 3 and the graphite 5 is attached at one or more locations, and has the configuration shown in FIGS. 2a, 1) and c.

As shown in the figure, the contact spring 6 has a contact portion 8 that is bifurcated, and a contact piece 9 is formed at the tip of the contact portion 8, and a base plate 10 is provided at the other end.

The purpose of bifurcating the contact spring 6 is to improve contact stability.

However, even if the contact springs 6 with such a configuration are provided, the contact between the shadow mask 3 and the graphite 5 is not completely stable due to vibrations, shocks, etc. Perfect contact stability cannot be achieved even with this arrangement.

If the contact springs 6 are attached to these multiple locations, work efficiency is poor and the number of work errors such as forgetting to attach them increases.

FIG. 3 shows a rear focusing color picture tube which also has an inner shield 11. In FIG.

In this case, the inner shield 11. shadow mask 3,
Since different voltages are applied to each of the phosphor surfaces 2, at least three points, in other words, graphite 5 - phosphor surface 2,
It is necessary to connect graphite 5 to shadow mask 3 and graphite 5 to inner shield 11 using contact springs 6.

In such a post-focusing color picture tube, as shown in FIG.
When the contact springs 6 shown in , l), and c are used, a reverse voltage is generated between each electrode due to contact failure or temporary contact failure due to impact, resulting in a metal back (not shown).
Peeling occurs, resulting in poor withstand voltage and defects in the fluorescent surface due to electron emission from the peeled pieces.

Therefore, in the rear focusing color picture tube, the contact spring 6 is required to have more contact stability.

If a plurality of contact springs 6 are attached to each connection location, work efficiency will deteriorate and work errors will greatly increase.

Therefore, an object of the present invention is to provide a cathode ray tube that maintains contact stability and prevents deterioration of workability and work errors.

In order to achieve this objective, the present invention improves the shape of a contact spring, and examples thereof will be described below.

FIG. 4a shows an embodiment of a contact spring used in a cathode ray tube according to the present invention, and the same parts are given the same reference numerals.

In the figure, two contact portions 8 are provided on the same side of the substrate 10 of the contact spring 6, and the tip of each contact portion 8 is bifurcated into one.

As described above, according to this embodiment, since each contact portion 8 is provided on the substrate 10, when attaching the contact spring 6, the same work as the conventional attaching of one contact spring 6 is sufficient. This can improve performance and reduce work errors.

Furthermore, since four contact pieces 9 are provided on the same substrate 10, the stability of contact is also improved.

Further, in the contact spring 6 having the configuration shown in FIG. 4a, by changing the length, width, thickness, etc. of each contact portion 8, the spring constant of the contact spring 6, which utilizes spring properties, is changed.

For this reason, changing the spring constant will prevent the contact piece 9 from being affected by shocks from outside the cathode ray tube, vibrations from the speaker, etc.
It is possible to completely prevent poor contact.

Next, FIG. 4 shows another embodiment of the contact spring used in the cathode ray tube according to the present invention.

In the figure, a substrate 10 is provided with four contact portions 8, two of which are provided on each side of the substrate 10.

The tips of these four contact portions 8 are each bifurcated to form a contact piece 9.

According to this embodiment, since two contact portions 8 are provided on each side of the substrate 10, the installation of the contact springs 6 can be done in the same way as the conventional installation of one contact spring 6. It is possible to improve work efficiency and reduce work errors.

Furthermore, since eight contact pieces 9 are provided on the same substrate, the stability of contact can also be improved.

Further, as shown in the first embodiment, if the length, width, and/or thickness of each contact portion 8 is changed, the spring constant of each contact portion 8 is changed, and shocks, vibrations, etc. It is also possible to completely prevent contact failure of the contact piece 9 due to the above.

Although the contact portion 8 is bifurcated in the above two embodiments, the present invention is not limited to this, and may be bifurcated into more than two forks.

As a result, the stability of contact can be further improved.

Further, in the above two embodiments, two and four contact portions 8 were formed, but the present invention is not limited to this, and the number is not limited as long as it is plural.

As explained above, according to the cathode ray tube according to the present invention, 1
Since the contact spring has a plurality of contact portions on one substrate and the contact pieces of each contact portion are branched into multiple stages, workability can be improved and work errors can be reduced.

Also, for each of the multiple contact parts, its length,
The contact reliability of the contact spring can be further improved by changing the width and/or thickness.

As a result, great effects can be achieved, such as improving the manufacturing yield of cathode ray tubes and the safety of completed cathode ray tubes.

[Brief explanation of drawings]

FIG. 1 is a schematic sectional view of a color picture tube, and FIG. 2a is a schematic cross-sectional view of a color picture tube. b, C are perspective views showing conventional examples of contact springs;
FIG. 3 is a schematic sectional view of a rear-stage focusing color picture tube, FIG. 4a is a perspective view showing a contact spring which is an embodiment of a cathode ray tube according to the present invention, and FIG. FIG. 2 is a perspective view showing a contact spring according to an embodiment of the present invention. 1...Glass bulb, 6...Contact spring, 8...Contact part, 9...
- Contact piece, 10... Board.

Claims (1)

[Scope of utility model registration request] A cathode ray tube in which a contact spring is provided at a certain location within a glass bulb is characterized by having a contact spring formed by providing a plurality of contact parts on the same substrate and branching the contact pieces of this contact part into a plurality of parts. Cathode ray tube.