JP3253577B2 - Funnel for CRT - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a funnel for a cathode ray tube.

[0002]

2. Description of the Related Art In a cathode ray tube manufacturing process, after evacuation of a cathode ray tube, a getter such as barium is heated and evaporated by high frequency heating from the outside of the cathode ray tube to adsorb residual gas remaining in the cathode ray tube, thereby obtaining a gas inside the tube. The degree of vacuum has been improved. In order to attach such a getter to the inside of the funnel, an elastic metal piece serving as a support member having one end of the getter is used. This is achieved by engaging and fitting a round projecting terminal of a button with a fitting hole formed in the elastic metal piece.

[0003]

However, in the mounting of the conventional getter, the getter provided at one end of the elastic metal piece has a radius equal to the length of the elastic metal piece centered on the anode button. There is a possibility that the getter is attached at a position. In particular, such getter attaching work is performed visually by an operator, so that the getter may be attached at a position deviating from an original predetermined position. As described above, since the getter is heated and evaporated later from the outside of the cathode ray tube by a high-frequency heating device, if the getter is not mounted at a predetermined position, a sufficient heating effect cannot be obtained. Is not performed properly, and as a result, there is a problem that a sufficient degree of vacuum in the cathode ray tube cannot be obtained.

[0004] Accordingly, it is an object of the present invention, a getter file
Easily and securely position in place on the inner surface of the channel
It is to provide a configuration that can be mounted in a fixed manner .

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems and objects, and has a getter attached to an anode button via a support member , inside a funnel.
CRT that is positioned and placed at the planned location on the surface
Funnel for positioning the getter
Mark the funnel around the planned location
The feature is that it is formed to be convex inward from the inner surface.
Is what you do .

[0006] In the above configuration, the marking is formed by a funnel.
It is preferably formed at the same time as the molding of the screw. Also getter
Is placed at the center of the above
Between the markings and markings.
Is preferred. In addition, the marking is the getter position
Is arranged around the above-mentioned planned arrangement position so that
It can be composed of a plurality of projections.

[0007]

According to the present invention, since the marking for positioning the getter is provided on the inner surface of the funnel, the getter attached to the inner surface of the funnel can be easily and reliably positioned at a predetermined position.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a funnel for a CRT according to the present embodiment will be described based on embodiments.

FIG. 1 is a cross-sectional view of a CRT in which a neck tube 2 and a panel 3 are sealed to a funnel 1 for a CRT according to the present invention, and FIG. 2 is a partially enlarged cross-section along the line AA in FIG. FIG.

On the inner surface of the funnel 1 for a cathode ray tube, an anode button 4 having a round projecting terminal 4 'is welded to a predetermined position. In the present embodiment, as a marking for positioning the getter 6 attached via the elastic metal piece 5 serving as a support member, a protrusion 7 having a hemispherical convex shape is formed around the expected arrangement position of the getter 6 on the inner surface of the funnel 1. It is formed. The protrusions 7 are formed at four points so that the position of the getter 6 is uniquely determined, and can be identified even when graphite for conduction is applied to the inner surface of the funnel 1. The graphite is formed to have a height of about 1 mm so that the graphite locally becomes thick and does not peel off.

The elastic metal piece 5 having the getter 6 at one end is attached to the anode button 4 by inserting the elastic metal piece 5 from two neck tubes of the cathode ray tube using a jig for attachment. While visually checking from outside
The getter 6 is positioned in the four protrusions 7, and in this state, the fitting hole 5 ′ formed in the elastic metal piece 5 and the protrusion terminal 4 ′ of the anode button 4 are engaged.

In the present embodiment, the protrusion 7 for positioning the getter 6 is formed on the molding surface of the mold for molding the inner surface of the funnel 1 by forming a hemispherical concave portion at a portion corresponding to the predetermined position of the getter 6 described above. Is formed at the same time as the funnel molding.

The shape of the marking may be concave, and in this case, a hemispherical convex shape may be formed on the molding surface of the mold for molding the inner surface of the funnel.
Regarding the method of forming the marking, for example, after forming the funnel, it is also possible to apply a convex marking with low-melting glass.

The shape, the forming method and the number of the marking are as follows.
The present invention is not limited to the above, and can be appropriately selected in consideration of the shape of the elastic metal piece and other various conditions.

[0015]

According to the funnel for a cathode ray tube of the present invention, the marking for positioning the getter is formed on the inner surface of the funnel around the expected position of the getter so as to project inward from the inner surface of the funnel. Formed into
Since the, Ru can be attached getter easily into place, yet is reliably positioned. As a result, there is an excellent effect that the subsequent heat evaporation of the getter is appropriately performed and a sufficient degree of vacuum of the CRT is obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a CRT using a funnel for a CRT according to the present invention.

FIG. 2 is a partially enlarged cross-sectional view taken along line AA of FIG.

[Description of Signs] 1 Funnel for cathode ray tube 2 Neck tube 3 Panel 4 Anode button 5 Elastic metal piece 6 Getter 7 Projection

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-62-172640 (JP, A) JP-A-10-144241 (JP, A) JP-A-1-134942 (JP, A) 82354 (JP, U) Jiko 49-2438 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 29/86-29/94 H01J 9/39

Claims (4)

(57) [Claims] A getter attached to an anode button via a support member is provided at a predetermined position on an inner surface of a funnel.
This is a CRT funnel that is positioned and
Thus, the marking for positioning the getter, the
Around the planned location, inward from the inner surface of the funnel
A funnel for a cathode ray tube, wherein the funnel is formed to have a convex shape . 2. The method according to claim 1, wherein the marking is performed by
Claims: formed simultaneously with the molding of the channel
2. The funnel for a CRT according to 1. 3. The getter is located at the center of the predetermined arrangement position.
When placed in the getter and the marking
3. An interval is formed between them.
The described funnel for a cathode ray tube. 4. The method according to claim 1, wherein the marking is provided at a position of the getter.
Are arranged around the predetermined arrangement position so that
2. A structure comprising a plurality of projections.
4. The funnel for a CRT according to any one of items 1 to 3.