JPH07114892A - Cathode-ray tube - Google Patents

Abstract

PURPOSE:To surely supply high voltage to a metal conductive film in a cathode- ray tube panel surface by a high voltage supply means of simple structure, in a skirtless panel type cathode-ray tube. CONSTITUTION:A play end part 14 of an anode contactor 13 is bent into a U shape and interposed by a step differenced part 17 of a seal surface 2 of a funnel 7 and a part provided with a carbon film 4 in an internal surface of a skirtless panel 1. In this way, the carbon film 4, conductibly connected to a metal conductive film 5 formed on phosphor layer 3 in the internal surface of the skirtless panel 1, is electrically connected to the anode contactor 13 by a sufficient contact pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube having a skirtless panel, and more particularly to a means for supplying a high voltage to a conductive film on the inner surface of the skirtless panel.

[0002]

2. Description of the Related Art FIG. 3 is a sectional side view showing the structure of a skirtless panel type cathode ray tube. In the figure, 1 is a skirtless panel. The skirtless panel 1 has an inner curved surface of a convex curve when viewed from the inside of the cathode ray tube, and is fixed to the sealing surface 2 of the funnel 7 with a frit glass 6. A phosphor layer 3 is applied to the inner curved surface of the skirtless panel 1, and a carbon coating 4 is applied to a part or the entire circumference of the phosphor layer 3. Further, a metal conductive film 5 is deposited on the entire upper surface of the phosphor layer 3 and a part of the upper surface of the carbon coating 4. A carbon coating 9 is applied to the inner surfaces of the funnel 7 and the neck 10. Reference numeral 8 is an anode button which is electrically connected to the carbon coating 9, and 11 is an electron gun arranged in the neck 10.

In such a skirtless panel type cathode ray tube, since the curved surface in the panel can be mechanically polished more easily than in the skirt panel type, higher optical quality can be obtained. In addition, since the fluorescent surface formed on the curved surface in the panel can be formed by the printing technique, there is an advantage that it can be manufactured at low cost by mass production.

[0004]

However, in the cathode ray tube having the above structure, there is a problem in supplying a high voltage to the inner surface of the panel. In particular, in a high-intensity cathode ray tube used for a color projector or the like, it is necessary to supply a high voltage exceeding 30 kv, which makes it difficult to supply a high voltage to the inner surface of the panel.

That is, in the case of the cathode ray tube having the skirt portion 12 as shown in FIG. 4, the carbon coating 4 is formed on the inner surface of the skirt portion 12, and the conductive protrusion 16 is formed on the inner end of the anode button 8. The anode contactor 13 composed of the attached spring plate is extended to the panel side along the inner surface of the funnel 7, and the play of the anode contactor 13 is made so that the plate surface of the anode contactor 13 substantially follows the carbon coating 4 on the inner surface of the skirt portion 12. The contactor 15 of the end 14 has a carbon coating 4
Is in elastic contact with. Therefore, the high voltage applied from the anode button 8 is supplied to the metal conductive film 5 on the inner surface of the panel through the anode contactor 13 and the carbon coating 4.

In the case of the cathode ray tube having the skirt portion 12 as described above, the anode contactor 13 comes into contact with the carbon coating 4 along the carbon coating 4 on the inner surface of the skirt 12, so that the anode contactor 13 is in contact with the carbon coating 4. The elastic force of the contactor 13 effectively contributes to the elastic contact with the carbon coating 4, and the contact is favorably performed.

However, in the skirtless panel type cathode ray tube as described with reference to FIG. 3, since the skirt portion does not exist in the peripheral portion of the panel, the contact between the anode contactor 13 described with reference to FIG. Does not come into contact along the plate surface direction of the anode contactor 13, and therefore good elastic contact cannot be obtained, which is a problem particularly when applied to a cathode ray tube of high voltage and large current.

In this case, the free end portion 14 of the anode contactor 13 is bent inward in an L-shape so that this contact can be made well, and the bent end portion is the skirtless panel 1.
In order to make contact along the inner surface of the anode, it is necessary to secure a sufficient length of the bent end portion, which results in a large area projected on the panel 1 of the anode contactor 13 as shown in FIG. There was a problem that the invalid screen was enlarged.

The present invention has been made in order to solve the above problems, and has a simple structure and a high voltage capable of reliably supplying a predetermined high voltage to a metal conductive film of a skirtless panel type cathode ray tube. It is intended to provide a skirtless panel type cathode ray tube having a supply means.

[0010]

In the cathode ray tube according to the present invention, a step is provided on at least a part of the sealing surface of the funnel, and the U-shaped bent free end of the anode contactor is connected to the sealing surface of the funnel. By sandwiching it between the stepped portion and the portion of the skirtless panel where the carbon coating is provided, the metal conductive film on the inner surface of the skirtless panel and the anode contactor are electrically connected through the carbon coating. .

[0011]

In the cathode ray tube according to the present invention, the free end of the anode contactor is sandwiched between the stepped portion provided on the funnel seal surface and the portion of the inner surface of the skirtless panel where the carbon coating is provided. It is possible to obtain a sufficient elastic force without making a large invalid screen at the time of contact between the anode coating and the carbon coating that is conductively contacted with the metal conductive film formed on the phosphor layer.

[0012]

【Example】

Example 1. Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a skirtless panel. The skirtless panel 1 has an inner curved surface with a convex curve when viewed from the inside of the cathode ray tube.
It is fixed by the frit glass 6. A phosphor layer 3 is coated on the inner curved surface of the skirtless panel 1, and a carbon coating 4 is formed on a part or the entire circumference of the phosphor layer 3.
Has been applied. Further, a metal conductive film 5 is deposited on the entire upper surface of the phosphor layer 3 and a part of the upper surface of the carbon coating 4. A carbon coating 9 is applied to the inner surfaces of the funnel 7 and the neck 10. A conductive anode button 8 into which an anode cap (not shown) supplied with a high voltage from the outside is fitted is embedded in the funnel 7, and a carbon coating applied to the inner surfaces of the funnel 7 and the neck 10. 9 is electrically connected. An anode contactor 13 is attached to a conductive protrusion 16 provided on the inner end of the anode button 8, that is, on the inner surface of the funnel 7. Reference numeral 11 is an electron gun arranged in the neck 10.

Further, according to the present invention, a step portion 1 as shown in the drawing is formed on a part of the sealing surface 2 of the funnel 7.
7 is provided. The free end portion 14 of the anode contactor 13 is bent in a U shape in a direction along the step portion 17 in advance before the anode contactor 13 is attached to the conductive protrusion 16, and is springed outward. The contactor 15 having a force is formed. The U-shaped portion is sandwiched between the skirtless panel 1 and the step surface 17 when the skirtless panel 1 is sealed to the seal surface 2 of the funnel 7 with the frit glass 6.

At this time, since the carbon coating 4 is provided on a portion of the inner surface of the skirtless panel 1 which contacts the contact 15, the phosphor layer 3 on the inner surface of the skirtless panel 1 is provided.
When the carbon coating 4 conductively connected to the metal conductive film 5 formed above and the contactor 15 come into contact with each other, a sufficient elastic pressing force can be obtained without increasing the invalid screen.

Example 2. FIG. 2 shows another embodiment of the present invention. Since 1 to 17 are the same as those shown in FIG. Contactor 15 on the inner surface of the skirtless panel 1
The concave portion 18 is provided in the portion where the contact is made, and the carbon coating 4 is formed in this portion. Further, a concave portion 19 is also provided in a portion of the step surface 17 which the free end portion 14 contacts. Then, the concave portions 18 and 19 of the contactor 15 and the free end portion 14 are formed.
Convex portions 20 and 21 are formed in the portion corresponding to.

When the skirtless panel 1 is sealed to the sealing surface 2 of the funnel 7 with the frit glass 6, the free ends 14 and the contacts 15 of the anode contactor 13 are made by the recesses 18 and 19 and the protrusions 20 and 21. Is prevented from being displaced, and a sufficient elastic pressing force between the contactor 15 and the carbon coating 4 cannot be obtained, or a poor electrical contact will not occur. It is not necessary to provide the above-mentioned concave portion and convex portion on both sides, only the concave portion 18 and the convex portion 20,
Alternatively, only the concave portion 19 and the convex portion 21 may be used.

[0017]

As described above, according to the present invention, in the skirtless panel type cathode ray tube, a step is provided at a part or the entire circumference of the seal portion of the funnel, and the free end portion of the anode contactor is sealed with the funnel. Since it is sandwiched between the stepped portion of the surface and the portion where the carbon coating is provided on the inner surface of the skirtless panel, a reliable high voltage supply means can be obtained with a simple structure, and a cathode ray tube with good performance is provided. You can

[Brief description of drawings]

FIG. 1 is a sectional side view showing a skirtless panel type cathode ray tube according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional side view of essential parts showing a skirtless panel type cathode ray tube according to Embodiment 2 of the present invention.

FIG. 3 is a sectional side view showing a skirtless panel type cathode ray tube.

FIG. 4 is a side sectional view showing a conventional type cathode ray tube.

FIG. 5 is a side sectional view showing a conventional skirtless panel type cathode ray tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Skirtless panel 2 Sealing surface 3 Phosphor layer 4 Carbon coating 5 Metal conductive film 7 Funnel 8 Anode button 13 Anode contactor 14 Free end part 15 Contactor 17 Step part 18 Concave part 19 Concave part 20 Convex part 21 Convex part

Claims (3)

[Claims] 1. A funnel, a skirtless panel sealed at its sealing surface at the open end of the funnel, a phosphor layer and a metal conductive film formed on the inner surface of the skirtless panel, and the skirtless panel. A carbon coating electrically connected to the end of the metal conductive film on the inner surface, an anode button provided on the funnel, and an anode contactor made of a metal spring plate provided on the inner end of the anode button. In the cathode ray tube having the step, at least a part of the sealing surface of the funnel is provided with a step, and the free end portion of the anode contactor bent in a U shape is connected to the step portion of the sealing surface of the funnel and the skirtless portion. By sandwiching the panel with a portion provided with a carbon coating, the metal conductive film and the above A cathode ray tube characterized by being electrically connected to an anode contactor. 2. A recess is formed in a portion of the stepped portion provided on the sealing surface of the funnel, which contacts the anode contactor, and the anode contactor is provided with a protrusion that fits into the recess. The cathode ray tube according to claim 1. 3. The cathode ray tube according to claim 1, wherein a recess is formed in a portion of the skirtless panel that is in contact with the anode contactor, and the anode contactor is provided with a protrusion that fits into the recess.