JPS62188132A - Color selecting electrode for color cathode-ray tube - Google Patents

Abstract

PURPOSE:To hold down the oscillations of the grid body structure of the color selecting electrode of a color cathode-ray tube, by bringing grid body structures of different resonance frequencies one over the other on a frame so as to construct the color selecting electrode. CONSTITUTION:The first grid body structure 13 forming slits 12a through which electron beams pass between fine metal striations 11a and the second grid body structure 14 forming slits 12b through which electron beams pass between fine metal striations 11b are provided. The grid body structures 13 and 14 are respectively made equal in the slit pitch and different from each other in the resonance frequency. And the grid body structures are bridged one over the other between supporting members 5 and 6 in such a manner that the grid body structure 13 becomes the side of a fluorescent surface, then both grid body structures 13, 14 and the supporting members 5, 6 are welded together. A damper line 10 is bridged orthogonally to the fine metal striations 11a and on the surface of the fluorescent surface side of the grid body structure 13 so as to construct a color selecting electrode 15. The up and down oscillations of the fine metal striations 11a of the grid body structure 13 having a color selecting function can be held down by the damper line 19 and the grid body structure 14.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a color selection electrode for a color cathode ray tube.

[Summary of the invention]

The present invention provides a color selection electrode for a color cathode ray tube in which a grid structure consisting of a large number of metal strips arranged and slits formed between each metal strip is stretched over a frame, in which the resonance frequencies are different from each other. By stacking and stretching multiple types of grid structures with the same slit pitch, the vibration of the metal strips that accompanies higher definition is suppressed.

[Conventional technology]

A color selection electrode used in a Trinitron (registered trademark) type color cathode ray tube has a large number of metal strips (1) arranged at a predetermined pitch in one direction, as shown in FIGS. 3 and 4, for example. A grid structure (so-called aperture grille) (3) in which slits (2) through which electron beams pass are formed between metal strips (11) is supported by a pair of opposing supporting members (5) of a frame-shaped frame (4). and (6). □The frame (4) has a pair of opposing support members (5) and (6) and both support members (
It is constituted in a rod shape by a pair of elastic members (7) and (8) extending between the elastic members (5) and (6). In the color selection electrode (9) configured in this way, a damper wire (10) is stretched in contact with the surface of the grid structure (3) on the fluorescent surface side in order to prevent vibration of the metal strip (1). .

[Problem that the invention seeks to solve]

In recent years, the above-mentioned color cathode ray tubes have also been made to have higher definition in order to be compatible with terminal displays, high-definition tubes, and the like. For this purpose, a color selection electrode (9
), the pitch of the grid structure (3) has become finer, and the width of the metal strip (1) has also become narrower, which inevitably reduces the strength of the metal strip (1). In order to suppress the vibration of the grid structure (3), the tension of the metal strips (1) is increased, but in grid structures that are compatible with high definition, the width of the metal strips (1) is narrow. Since the strength decreases, the tension of the metal strip cannot be increased as in the past. Also, the damper wire (10) becomes more noticeable because there is no interlace, so the damper wire (lO)
It also needs to be made thinner. In addition to this situation, due to the limitations of etching technology, it was necessary to reduce the thickness of the grid structure, which further reduced the strength of the metal strips, and as a result, it was difficult to suppress the vibration of the grid structure. .

In view of the above-mentioned points, the present invention provides a color selection electrode for a color cathode ray tube that can suppress vibrations of a grid structure, especially in response to higher definition.

[Means for solving problems]

The present invention provides a color selection electrode for a color cathode ray tube, which has a grid structure in which a large number of metal strips are arranged and slits are formed between each metal strip and is stretched over a frame, and the resonance frequencies are different from each other. , a plurality of types of grid structures (13) and (14) having the same slit pitch are stacked and stretched on the frame (4).

The grid structures (13) and (14) are formed, for example, by using different materials or metal strips (lla) and (llb) with different cross-sectional areas so as to have different resonance frequencies. Of the grid structures (13) and (14), the grid structure (13) on the fluorescent surface side serves as a main grid structure with a color selection function, and the grid structure (14) on the back side serves as an auxiliary grid structure for suppressing imaging. Eggplant is allowed. Therefore, the slit width W2 of the grid structure (14) on the back surface can be made larger than the slit width W1 of the grid structure (13) on the fluorescent surface side so as not to obstruct the traveling of the electron beam.

[Effect]

Grid structures (13) and (14) with different resonance frequencies
The grid structure (1
Even if either of (3) and (14) resonates, the vibration is suppressed by contact friction with the other grid structure.

〔Example〕

Hereinafter, embodiments of the color selection electrode of a color cathode ray tube according to the present invention will be described with reference to FIGS. 1 and 2.

In this example, a first grid structure (13) in which a large number of metal strips (lla) are arranged at a predetermined pitch and slits (12a) through which the electron beam passes between the metal strips (lla) are formed; Similarly, a second grid structure (14) is provided in which a large number of metal strips (llb) are arranged at a predetermined pitch, and a line (12b) through which the electron beam passes is formed between each metal strip (llb). The first and second grid structures (13) and (14) have different cross-sectional areas of the metal strips (lla) and (llb) or different metal materials of the grid structures so that their resonance frequencies are different from each other. to form. First and second grid structures (13) and (14)
) are formed so that the slit pitch is the same, and the slit width W2 of the second grid structure (14) is larger than the slit width W1 of the first grid structure (13). These first and second grid structures (13) and (1
4) is formed by selectively etching a thin metal plate.

Then, the first and second grid structures (13) and (
14) are stacked so as to be in contact with each other, and stretched between opposing supporting members (5) and (6) of the frame-shaped frame (4), and both grid structures (13) and (14) and supporting members Weld members (5) and (6). The frame (4) includes a pair of supporting members (5) and (6) facing each other, and a pair of elastic members (7) extending between the supporting members (5) and (6).
and (8) are formed into a frame shape.

In the first and second grid structures (13) and (14), the first grid structure (13) is the main grid structure having a color selection function, and the first grid structure (13)
The arrival position of the electron beam on the fluorescent surface is determined by the slit (12a) of the second grid structure (14).
) serves as an auxiliary grid structure for vibration suppression, as will be described later. Therefore, the slit width W2 of the second grid structure (14) is formed large so as not to impede the travel of the electron beam. Then, an appropriate number of damper wires (10) are strung orthogonally to the metal strips (lla) on the fluorescent surface side surface of the first grid structure (13), and the desired color selection electrode (
15).

According to this configuration, since the first and second grid structures (13) and (14) having different resonance frequencies are stretched in an overlapping state, the grid structures (13) and (14) have different resonance frequencies.
) that resonates, the vibration is suppressed by contact friction with the other grid structure. i.e. the metal strips (lla) of the first grid structure (13) with in particular a color selection function.
The damper wire (10) suppresses the vertical vibration of the second grid structure (14).
This suppresses the downward swing.

Therefore, when constructing a grid structure made of thin metal strips with an extremely small pitch due to high definition, even if the tension when stretching the grid structure is the same as before, vibrations can be sufficiently suppressed. be able to. Also, this allows the damper wire (10) to be made thinner, and furthermore, the damper wire can be omitted.
Alternatively, the number of damper wires can be reduced, and the damper wires can be avoided from becoming conspicuous.

In addition, in the conventional color selection electrode, when the electron beam directly hits the grid structure, it tends to thermally expand and mislanding occurs, but in the color selection electrode of the present invention, the electron beam hits the second grid structure (14), Since the second grid structure (14) absorbs heat and does not impart thermal energy to the first grid structure (13), mislanding is less likely to occur.

〔Effect of the invention〕

According to the present invention, a color selection electrode is constructed by stacking a plurality of types of grid structures having different resonance frequencies and stretching them on a frame, so that even if any one of the grid structures resonates,
Vibration is suppressed in the other grid structure, and vibration of the grid structure as a whole is suppressed. For this reason,
Even when the pitch of the grid structure is made finer and the metal strips are made thinner, the tension applied to the grid structure can be maintained at the same level as before. Further, the damper wire can be made thinner, and the damper wire can be omitted or the number of damper wires can be reduced, making it possible to avoid the damper wire from becoming noticeable.

Therefore, the color selection electrode of the present invention is suitable for use in high-definition tubes.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the color selection electrode of a color cathode ray tube according to the present invention, FIG. 2 is an enlarged sectional view taken along the line B-B of FIG. 1, and FIG. 3 is a color selection electrode of a conventional color cathode ray tube. FIG. 4 is a perspective view showing an example of a selection electrode, and FIG. 4 is an enlarged sectional view taken along line A--A in FIG. (1), (lla) (llb) are metal strips, (21,
(12a), (12b) are slits, (3), (
13) and (14) are grid structures, and (4) is a frame.

Claims (1)

[Claims] In a color selection electrode for a color cathode ray tube, which is constructed by extending a grid structure in which a large number of metal strips are arranged and slits are formed between each metal strip, the slits have different resonance frequencies. A color selection electrode for a color cathode ray tube, which is constructed by stacking and extending a plurality of grid structures having the same pitch.