JP3218652B2 - Cathode ray tube color selection mechanism - Google Patents

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 (CRT) color selection mechanism, and more particularly to a damper wire which is stretched (stretched) on a surface of an aperture grill (AG) tape for a trinitron type CRT to prevent vibration. Things.

[0002]

2. Description of the Related Art A trinitron type CRT is provided with a number of vertical openings (apertures) in a thin plate such as a thin mild steel plate by etching as a mechanism for color selection to impart a certain tension to a steel frame. A large number of tape-shaped grid bodies attached by welding or the like in a state of being used are used. The thin plate (the thin plate after being etched) having the above-mentioned opening, a large number of tape-like grid elements, and rims is usually called an FAG (aperture grill thin plate). A color selection mechanism having FAG as a part thereof is called an AG (aperture grill).
The electron beam passes through the opening of the FAG and emits light when hitting the phosphor screen.

FIG. 1 shows a FAG mounted on a frame.
FIG. 2 is a perspective view showing (AG5), FIG.
FIG. 3 is a partially enlarged view of FIG. 1 to 3,
Reference numeral 1 denotes a frame, 2 denotes a FAG, 2a denotes a tape-shaped grid element, 2b denotes an opening (aperture), and 3 denotes a damper wire formed of a fine wire extending perpendicularly to the opening 2b to prevent vibration of the FAG. A tungsten wire is usually used as the damper wire, and the figure shows a case using two damper wires. 4 is a damper wire 3 and a frame 1
It is a damper spring that is fixed to As shown in FIG. 2, the cross section of the FAG 2 has a form in which tapes of mild steel plates are arranged, and starts vibrating at frequencies corresponding to the lengths and tensions of the strings, like strings of musical instruments. This vibration disturbs the riding of the electron beam on the phosphor screen and causes disturbance of the image screen.
A thin wire (damper wire) 3 of ３０30 μm is stretched.

[0004]

The higher the tension of the damper wire is, the higher the effect of damping the vibration of the aperture grill (AG) is, but another problem occurs. That is, the AG receives heat or a mechanical impulse, and as shown in FIG. 4, the AG shifts from the original tape-like grid element position 7a of the mild steel sheet to the position 7b, and is strongly pressed by the tungsten wire. Is more likely not to return to the position 7a. When the product is made with the tape position of the damper wire mild steel sheet shifted, a thin vertical draft on the screen (pitch moire)
Will occur. This vertical draft is particularly noticeable when the screen is entirely white.

Accordingly, the present invention provides a trinitron type (trade name) capable of reducing vertical drafts (pitch moiré) generated as an image screen disturbance and further attenuating FAG vibration.
It is an object of the present invention to provide a cathode ray tube color selection mechanism.

[0006]

SUMMARY OF THE INVENTION According to the present invention, there is provided an aperture grill thin plate having a plurality of tape-shaped grid elements, and the aperture grill thin sheet substantially perpendicular to each of the tape-shaped grid elements. in the cathode ray tube color selection mechanism and a damper wire stretched over the surface, before
The surface of the damper wire is used to reduce the coefficient of friction.
The problem is solved by a cathode ray tube color selection mechanism characterized by being provided with a lubricant .

[0007]

According to the present invention, the surface of the damper wire 3 is ground.
Because a lubricant is applied to reduce the friction coefficient,
The temporarily displaced tape-shaped grid element body 2a can easily return to its original position, thereby reliably preventing the generation of a vertical draft on the screen.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the braking force Fr in the direction P shown in FIG. 3 and FIG.
And the damper wire 3 have a small coefficient of friction), while the direction Q
Is the same as before.

In order to reduce the coefficient of friction as described above, in the present embodiment, the surface of the tungsten wire used as the damper wire 3 is coated with a carbon coating (film) as a lubricant to lower the coefficient of friction. Table 1 shows the results of an example in which a tungsten wire was coated on the surface of a tungsten wire and a comparative example with a conventional tungsten wire as it is. In Table 1, n
Is the number of the measured damper wires, and therefore, the coefficient of friction indicates the average value of five samples. Σ indicates the variation in the coefficient of friction at that time. The smaller the σ, the smaller the variation in the coefficient of friction and the more uniform the damper wire.

[0010]

[Table 1]

As is evident from Table 1, in the embodiment in which the friction coefficient (average friction coefficient) is reduced (0.561 → 0.320) by applying a carbon coating to the tungsten wire (damper wire), the screen is defective (pitch moire). ) Did not occur. The variation σ is also improved from 0.140 to 0.060, and it can be seen that a damper wire with less variation in the coefficient of friction can be obtained.

As a method of reducing the friction coefficient of the vibration-preventing thin wire to the tape-like grid material, in addition to applying a lubricant as in the above-described embodiment, plating the surface of the damper wire with chrome or the like, It is conceivable that the material itself is made of chrome or the like.

[0013]

As described above, according to the present invention, vertical drafts (pitch moire) can be reduced on the image plane of a CRT using an aperture grill thin plate, and the resonance of the aperture grill thin plate can be quickly attenuated. it can.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a FAG (aperture grill thin plate) attached to a frame.

FIG. 2 is a sectional view taken along line II of FIG.

FIG. 3 is a partially enlarged view of FIG. 1;

FIG. 4 is an enlarged sectional view of a portion A in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Frame 2 FAG (aperture grill thin plate) 2a Tape grid element 2b Opening (aperture) 3 Damper wire (thin wire) 4 Damper spring 5 AG (aperture grill) 7a Original tape element grid element position 7b Offset tape element grid Body position

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Atsushi Atsushi 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Inside Sony Corporation (56) References JP-A-1-206544 (JP, A) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) H01J 29/07

Claims (1)

(57) [Claims] 1. A cathode ray tube comprising: an aperture grill thin plate having a plurality of tape-like grid elements; and a damper wire stretched on the aperture grill thin-sheet surface in a state substantially orthogonal to each of the tape-like grid elements. In the color selection mechanism, to reduce the friction coefficient on the surface of the damper wire
A cathode ray tube color selection mechanism, characterized in that a lubricant is applied .