JPH0727551Y2 - Cathode ray tube - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement of a cathode ray tube of a type in which a panel is sealed at the front open end of a funnel.

2. Description of the Related Art In the cathode ray tube of the type described above, as a means for electrically connecting the graphite layer on the inner surface of the funnel and the conductive layer on the back surface of the panel, for example, connecting means as shown in FIGS. 7 to 8 has been proposed ( Japanese Patent Publication No. 60-46512). That is, this one uses a connecting tool 100 as shown in FIG. 8, and attaches a mounting piece 101 of this connecting tool 100 to a frit seal between the front opening end of the funnel 1 and the panel 2 as shown in FIG. It is pinched and fixed in a state where it is inserted into the portion 3, and a pair of left and right spring contact pieces 1 of the connecting tool 100.
02 and 102 are elastically contacted with the conductive layer 4 on the rear surface of the panel 2,
The other spring contact piece 103 is attached to the graphite layer 5 on the inner surface of the funnel 1.
The terminal 104 is led to the outside of the funnel 1 and is supplied with a high voltage.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the cathode ray tube adopting the connecting means as described above, since the mounting piece 101 of the connecting tool 100 penetrates the frit seal portion 3, there is a problem in terms of sealing performance. is there. That is, both the funnel 1 and the panel 2 of this cathode ray tube are made of glass, and therefore both are sealed by the glass frit, whereas the connector 100 is made of metal, and therefore the frit seal is caused by the difference in thermal expansion coefficient. In some cases, an extremely fine gap may be formed in the portion of the portion 3 through which the mounting piece 101 penetrates, and the degree of vacuum inside the cathode ray tube may decrease over time. Further, in an extreme case, a crack may occur in the frit seal portion 3 or the like due to the difference in thermal expansion coefficient.

Means for Solving the Problems In order to solve the above problems, the present invention provides a cathode wire in which a circular flat plate-shaped face panel having a conductive layer on the back side is sealed at the front opening end of a funnel having a graphite layer on the inner surface. In the tube, a ring-shaped connecting member, which is formed of an annular body projecting at least a plurality of spring contact pieces extending toward the funnel side and electrically connects the graphite layer and the conductive layer, is incorporated in the funnel. It is a summary.

Effect of the Invention By using the annular connecting member composed of the annular body in which a plurality of spring contact pieces are projected in this manner, the spring contact piece is provided on the graphite layer on the inner surface of the funnel, which has a substantially mortar shape, and the conductive layer on the back side of the face panel By elastically contacting each spring contact piece or annular body, the annular connecting member can be stably incorporated inside the funnel and the graphite layer and the conductive layer can be electrically connected. It is not necessary to provide a protrusion and clamp and fix it to the frit seal portion. Therefore, the front open end of the funnel and the panel are securely sealed by the glass frit over the entire circumference without sandwiching metal pieces having different coefficients of thermal expansion, so that there is no risk of defective sealing or cracks.

The high voltage is supplied from the stem portion through the anode button provided in the funnel portion or the high voltage control electrode of the electron gun in the small cathode ray tube.

Further, if the annular body of the annular connecting member is brought into contact with the conductive layer on the back surface side of the panel, the glass frit protruding inward along the rear surface of the panel during sealing can be hidden by the annular body and invisible from the front.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples.

1 is an exploded perspective view of a cathode ray tube according to an embodiment of the present invention, FIG. 2 is a sectional view of the cathode ray tube, and FIG. 3 is a partially enlarged sectional view of FIG.

In FIGS. 1 and 2, reference numeral 1 denotes a funnel-shaped funnel, and the funnel 1 is integrally formed with a neck 6 by glass. A graphite layer 5 is formed on the inner surface extending from the funnel 1 to the neck 6, and a high voltage is supplied to the graphite layer 5 from a stem portion (not shown) via a high voltage control device of an electron gun 8 built in the neck 6. It

At the front open end of the funnel 1, a flat panel 2 made of a glass plate is sealed with a glass frit 3. A fluorescent layer 9 and a conductive layer 4 made of graphite or the like are formed on the rear surface of the panel 2, and an aluminum layer is further formed on the rear surface.
10 is vapor-deposited and laminated and electrically connected to the conductive layer 4.

Further, inside the funnel 1, an annular connecting member 11 for electrically connecting the graphite layer 5 and the conductive layer 4 is incorporated. The annular connecting member 11 in this embodiment is composed of an annular body 13 in which four spring contact pieces 12 ... Are projectingly provided at an angular interval of 90 degrees. As shown in FIG.
A curved contact portion 121 at one end protruding toward the panel 2 side of 12 is elastically contacted with the conductive layer 4, and a curved contact portion 122 at the other end protruding toward the funnel 1 side is elastically contacted with the graphite layer 5. The conductive layer 4 and the graphite layer 5 are electrically connected by 12 ... Therefore, a high voltage is supplied to the aluminum layer 10 on the rear surface of the panel 2 through the high voltage wire 7, the graphite layer 5, the spring contact piece 12, ..., And the conductive layer 4.

When the annular connecting member 11 is built in the funnel 1 in such a state that the spring contact pieces 12 ... Are elastically contacted with each other, the funnel 1 is substantially mortar-shaped and the inner surface provided with the graphite layer 5 is a tapered surface. The curved contact portion 122 at the other end of each spring contact piece 12 is supported by the action of the surface. Therefore, even if a metal piece or the like for fixing is provided on the annular connecting member 11 and the metal piece or the like is not inserted into the sealing portion of the glass frit 3, the spring contact pieces 12 ... The annular connector is stably fixed in the funnel 1.

The cathode ray tube having the above-described structure has the rear end opening 14 of the neck 6.
After inserting the electron gun 8 further, the air inside the cathode ray tube is sucked and removed from the rear end opening 14 to bring the inside of the cathode ray tube to a high vacuum state to seal the rear end opening 14, but as described above. The front open end of the funnel 1 and the panel 2 are securely sealed by the glass frit 3 over the entire circumference without any metal piece or the like having a different thermal expansion coefficient for fixing the connecting member sandwiched between them, so that the sealing failure may occur. There is no risk of lowering the degree of vacuum or cracking of the sealed portion. Therefore, a highly reliable cathode ray tube can be obtained.

In the present invention, in addition to the above-mentioned ones, the ones shown in FIGS. 4 and 6 are also used as the annular connecting member. That is, the annular connecting member 11a shown in FIG.
Four spring contact pieces 12a, which are elastically contacted only with, are projected on a toroidal plate-like annular body 13a. As shown in FIG. 5, each of the spring contact pieces 12a has a funnel 1 as shown in FIG. The annular body 13a is built in the funnel 1 while being in elastic contact with the inner graphite layer 5 and in contact with the conductive layer 4 on the rear surface of the panel 2. When the annular body 13a is in contact with the conductive layer 4 in this manner, when the front open end of the funnel 1 and the panel 2 are sealed with each other via the glass frit 3, the glass frit 3 extends along the rear surface of the panel 2. Even if it protrudes inward, the glass frit 3 is hidden by the annular body 13a so that it cannot be seen from the front surface (face) of the panel 2, which has the advantage of improving the appearance. Further, the annular connecting tool 11b shown in FIG. 6 has three spring contact pieces 12b, which elastically contact the conductive layer 4, and three spring contact pieces 12b ', which elastically contact the graphite layer 5, integrated with the annular body 13b. The spring contact pieces 12b on the side of the conductive layer 4 are formed with an angular interval of 120 degrees, and the spring contact pieces 12b 'on the side of the graphite layer 5 are formed on the conductive layer 4.
It is formed with an angular interval of 120 degrees so as to be positioned in the middle of the side spring contact pieces 12b ....

The number of spring contact pieces of the annular connecting member may be any number as long as it is two or more.

As is apparent from the above description, the cathode ray tube of the present invention is
By incorporating a ring-shaped connecting member made of a ring-shaped body having a plurality of protruding spring contact pieces into the funnel to electrically connect the graphite layer and the conductive layer, a metal piece or the like for fixing the connecting member is connected between the funnel and the panel. Since it is configured not to be sandwiched in the sealing part,
It is possible to securely seal the front open end of the funnel and the panel around the entire circumference with a glass frit, and it is possible to satisfactorily prevent the vacuum degree inside the cathode ray tube from decreasing due to poor sealing and the occurrence of cracks in the sealed portion. There is an effect that the reliability is significantly improved.

[Brief description of drawings]

1 is an exploded perspective view of a cathode ray tube according to an embodiment of the present invention, FIG. 2 is a sectional view of the same cathode ray tube, FIG. 3 is a partially enlarged sectional view of FIG. 2, and FIG. FIG. 5 is a perspective view of another annular connecting member used, FIG. 5 is a partially enlarged sectional view of another embodiment of the present invention using the annular connecting member of FIG. 4, and FIG. 6 is still another annular connecting member used in the present invention. FIG. 7 is a perspective view of a member, FIG. 7 is a partial sectional view of a conventional example, and FIG. 8 is a perspective view of a conventional connecting member. 1 ... Funnel, 2 ... Panel, 3 ... Glass frit, 4 ... Conductive layer, 5 ... Graphite layer, 11, 11a, 11b ... Annular connection member, 12, 12a, 12b, 12b '... Spring Contact piece, 13,13a, 13b
…… A ring.

Claims (1)

[Scope of utility model registration request] 1. A cathode ray tube in which a circular flat plate-shaped face panel having a conductive layer on the back side is sealed at the front opening end of a funnel having a graphite layer on the inner surface, and extends at least to the funnel side inside the funnel. A cathode ray tube, characterized in that an annular connecting member made of an unbroken annular body having a plurality of spring contact pieces projecting therefrom is arranged to electrically connect the graphite layer and the conductive layer.