JPH0590795U - Cathode ray tube - Google Patents

Abstract

(57) [Summary] [Object] To provide a cathode ray tube in which the position of an electron gun does not change before and after receiving an impact force in the Y-axis direction. [Structure] At least two conductors 6a to 6d are attached so that at least two conductors 6c and 6d sandwich a getter spring 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a cathode ray tube, and more particularly to a cathode ray tube in which a conductor mounting position and a conductor shape of an electron gun are improved.

[0002]

[Prior Art]

 A conventional cathode ray tube will be described with reference to FIGS. FIG. 5 is a cross-sectional view showing a main part, and FIG. 6 is a side cross-sectional view of the same. In the figure, 1 is a neck tube made of glass, 2 is a shield cup, 3a to 3c are conductors, 4 is a conductive film formed on the inner wall of the neck tube 1, and one end of the conductors 3a to 3c is a shield cup. It is fixed to the outer side surface of 2 by welding or the like and the other end side is in contact with the conductive film 4. Reference numeral 5 denotes a getter spring attached to the bottom of the shield cup 2.

[0003]

[Problems to be solved by the device]

 As described above, the conventional cathode ray tube has the three conductors 3a to 3c, one on the upper portion of the shield cup 2 as shown in FIG. 5, and one each on the left and right at positions rotated by 120 ° about the tube axis. Since 3b and 3c are attached, for example, as shown in FIG. 7, some impact force A is applied in the Y-axis direction, and when the electron gun moves downwards, it is attached to the left and right sides of the shield cup 2. The conductors 3b and 3c move above the conductive film 4 formed on the inner wall of the neck tube 1 in the direction of arrow B along the inner wall of the neck tube 1 as shown in FIG. 7, and the impact force A is removed. Even after that, due to the frictional force generated between the conductors 3b and 3c and the conductive film 4, the conductors 3b and 3c do not return to the positions before the impact force A is applied, and the position of the electron gun changes. There was a point.

To reduce the frictional force generated between the conductors 3b and 3c and the conductive film 4, there is a method of using a material (for example, gold) having a small friction coefficient for the conductors 3b and 3c, but the cost is high. That was a problem.

The present invention has been made to solve the above problems, and a cathode ray tube in which the position of the electron gun does not change before and after the impact is applied even if an impact force is applied in the Y-axis direction at low cost. The purpose is to provide.

[0006]

[Means for Solving the Problems]

 The cathode ray tube of the present invention is such that at least two of the plurality of conductors mounted on the shield cup are mounted so as to sandwich the getter spring mounted near the bottom of the shield cup.

[0007]

[Action]

 In this invention, by mounting the conductor near the lowermost portion of the shield cup, the conductor moves in the direction along the inner wall of the neck tube even if the electron gun moves downward due to an impact force in the Y-axis direction. Since the amount is small and the electron gun is supported by multiple conductors, the electron gun can easily return to the position before the impact force is applied even after the impact force is removed.

[0008]

【Example】

 Example 1. An embodiment of this invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a main part, and FIG. 2 is a cross-sectional view of the same side. The same or corresponding parts as those of the conventional one are designated by the same reference numerals and the description thereof will be omitted. In the figure, 6a to 6d are conductors, of which 6c and 6d are mounted near the lowermost portion of the shield cup 2 so as to sandwich the getter spring 5 on the left and right.

By arranging the conductors 6c and 6d in this way, even if an impact force is applied in the Y-axis direction and the electron gun moves downward due to the impact force, it can be attached near the bottom of the shield cup 2. The two conductors 6c and 6d have an extremely small amount of movement in the direction along the inner wall of the neck tube 1, and since the conductors 6c and 6d are largely deflected in the Y-axis direction, the above impact force is removed. Even after being damaged, the electron gun can easily return to the initial position without being affected by the frictional force generated between the conductors 6c and 6d and the conductive film 4 formed on the inner wall of the neck tube 1. You can

Example 2. As shown in FIGS. 3 and 4, the effect similar to that of the first embodiment can be obtained by mounting the bifurcated conductor 7 having the conductors 6c and 6d on both ends of the bifurcated shape.

[0011]

[Effect of the device]

 As described above, according to the present invention, since the plurality of conductors are attached near the bottom of the shield cup, even if the electron gun moves downward due to the impact force in the Y-axis direction, the impact force is reduced. After removal, the electron gun can easily return to its initial position.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a main part of a cathode ray tube according to a first embodiment of the present invention.

FIG. 2 is a side sectional view of FIG. 1 seen from below.

FIG. 3 is a cross-sectional view showing a main part of a cathode ray tube according to a second embodiment of the present invention.

FIG. 4 is a side sectional view of FIG. 3 as seen from below.

FIG. 5 is a cross-sectional view showing a main part of a conventional cathode ray tube.

FIG. 6 is a side sectional view of FIG. 5 viewed from the side.

FIG. 7 is a diagram showing movements of an electron gun and a conductor when an impact force is applied from the Y-axis direction in FIG.

[Explanation of symbols]

 1 Neck Tube 2 Shield Cup 4 Conductive Film 5 Getter Spring 6a Conductor 6b Conductor 6c Conductor 6d Conductor 7 2 Crotch Conductor

Claims (2)

[Scope of utility model registration request] 1. A cathode ray tube having a plurality of conductors each having a contact portion that contacts a conductive film formed on the inner wall of the neck and a mounting portion that is continuous with the contact portion, and a shield cup to which the mounting portion of the conductor is mounted. The cathode ray tube according to claim 1, wherein at least two of the plurality of conductors are attached near the bottom of the shield cup so as to sandwich a getter spring attached at the bottom of the shield cup. 2. A cathode ray tube characterized in that, instead of the two conductors which are attached in a form sandwiching a getter spring, a bifurcated conductor which is divided into two forks is attached near the bottom of the shield cup. .