JP2000011912A - Color selection mechanism for cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To always keep the resilient ontact state of a damper member to a grit piece part to surely restrain vibration in an aperture grill by fitting an elastic member to the aperture grill frame in the direction of separating the suppoer piece part from the damper member. SOLUTION: Metallic support springs 11 made of aluminum or stainless, fitted to four corners of an aperture grill frame 3 for holding an aperture grill 2 of a color selection mechanism 1, have sufficient elasticity for energizing a support tape of the aperture grill 2 in a direction separating from a damper wire 4, the deformation of a support tape is corrected to always hold the resilient contact state of the damper wire 4 to a number of tape-like grid piece parts and be laid along an ideal reference imaginary curved surface of the aperture grill 2. An electron beam can be controlled accurately to be guided to each fluorescent body of a fluorescent surface by restraining the vibration caused in the aperture grill 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mechanism for selecting a cathode ray tube such as a color television receiver and a color monitor, and more particularly to a mechanism for selecting a color of a cathode ray tube having an aperture grill.

[0002]

2. Description of the Related Art A cathode ray tube is provided with a color selection mechanism for controlling an electron beam emitted from an electron gun to guide the electron beam to each phosphor on a phosphor screen. As this color selection mechanism, for example, there is provided an aperture grill formed with a number of fine vertical stripe openings (apertures) and an aperture grill frame holding the aperture grill.

As shown in FIG. 8, a conventional color selection mechanism 100 includes an aperture grill 101 and an aperture grill frame 1 for holding the aperture grill 101.
02 and a damper wire 103 for suppressing vibration generated in the aperture grill 101.

The aperture grill 101 is formed by forming a plurality of fine vertical stripe-shaped openings (hereinafter, referred to as slits) 104 on a thin plate such as a mild steel plate by an etching method, thereby forming a plurality of tape-shaped grit pieces (hereinafter, referred to as slits). , 105) and a frame-shaped support portion 106 for supporting the tape 105.

[0005] As shown in FIG. 9, the aperture grill 101 has support pieces 106 a (hereinafter referred to as support tapes) 106 a on both sides parallel to the tape 105 and an effective screen when assembled on the front panel of the cathode ray tube. An extra slit 104 for ensuring the slit width at the extreme end between the extreme slit 104b constituting the region 107
a is formed. The extra slit 104a
It is composed of an end tape 105a and a support tape 106a.

[0006] The aperture grill frame 102 is shown in FIG.
, A pair of left and right vertical frame members 102a, 102a
And a pair of upper and lower beam frame members 102b, 102b are connected to form an overall frame shape.

[0007] Wire mounting springs 108 for fixing damper wires 103 are respectively attached to the upper and lower portions of the outer side surface of the vertical frame member 102 a on the aperture grill frame 102. Wire mounting spring 1
Reference numeral 08 has a lower end fixed to the vertical frame member 102a and a damper wire 103 attached to the upper end. The damper wire 103 is attached to the wire attachment spring 108 in a slightly stretched state as described later.

The aperture grill frame 102 is provided with a leaf spring 109 for fixedly supporting it when it is mounted on a front panel of a cathode ray tube (not shown), for example, on the outer surfaces of a left and right vertical frame member 102a and a lower beam frame member 102b. Attached to.

The both ends of the damper wire 103 are attached to the wire attachment spring 108 of the vertical frame member 102a so as to be orthogonal to the tape 105 and the support tape 106a. The upper and lower damper wires 103 are stretched over the aperture grille 101 and the tape 10
5 and the support tape 106a.

As shown in FIG. 9, the conventional color identification mechanism 100 constructed as described above has an aperture grille frame 102 with an aperture grill whose surface follows a reference virtual curved surface 110 having a uniform curvature. Attached to. The color selection mechanism 100, as shown in FIG.
Since the aperture grill 101 has a slight curvature, all the tapes 10 constituting the aperture grill 101
5 is elastically contacted with the damper wire 103. Therefore, in the color selection mechanism 100, the vibration generated in the tape 105 is suppressed by the elastic force of the damper wire 103.

[0011]

In the conventional color selection mechanism 100, as described above, the aperture grill 101 is formed on the reference virtual curved surface 110 having a uniform curvature.
The surface of the is designed to fit. However, when the color selection mechanism 100 is subjected to a process such as a blackening process for improving the contrast by increasing the absorptance of external light to the aperture grill 101, as shown in FIG.
Deformation that deviates from the ideal reference virtual curved surface 110 occurs.

For this reason, the conventional color selection mechanism 100
As described above, the aperture grill 101 is provided with the extra slit 104a for guaranteeing the slit width at the end of the effective screen area 107 (the end slit 104b) when incorporated in the front panel of the cathode ray tube. . Even if the support tape 106a is deformed and the extra slit 104a is deformed, the color selection mechanism 100 forms the outermost slit 104b constituting the outermost end of the effective screen area 107 when incorporated in the front panel of the cathode ray tube.
Is guaranteed.

However, the conventional color selection mechanism 100
As shown in FIG. 12, when the support tape 106a is deformed, the tape 105 often moves in a direction in which the elastic contact state with the damper wire 103 cannot be maintained, so that a so-called damper floating phenomenon is often exhibited.

That is, as shown in FIG. 13, in the color selection mechanism 100, the deformed support tape 106a pushes up the damper wire 103, and this damper wire 1
03 does not come into contact with the tape 105 in the effective screen area 107. When the tape 105 stops contacting the damper wire 103, the color selection mechanism 100 cannot obtain a sufficient damping effect, the tape 105 near the support tape 106a and the support tape 106a themselves start to vibrate, and the entire aperture grill 101 vibrates. Will be.

The color selection mechanism 100 includes an aperture grill 1
When the vibration occurs in 01, a problem arises that the electron beam does not hit a predetermined phosphor and color shift occurs in the cathode ray tube. Therefore, in the conventional color selection mechanism 100, the assembling of the aperture grill 101 to the front panel near the extra slit 104a and the support tape 106a has to be performed carefully while checking the amount of change.

Further, in the conventional color selection mechanism 100, the cathode ray tube tends to be flattened, and the aperture grill 101 is also flattened in accordance with the cathode ray tube. For this reason, in the color selection mechanism 100, the tape 105 is easily separated from the damper wire 103, and the aperture grill 101 is apt to vibrate.

As described above, the color selection mechanism 100 requires special attention to the deformation of the support tape 105.
Even if the support tape 106a is not located on the ideal reference virtual curved surface 110, the color selection mechanism 100
By maintaining the elastic contact state of the support tape 106 with the damper wire 103, the aperture grill 101 does not vibrate due to the deformation of the support tape 106a.

SUMMARY OF THE INVENTION Accordingly, the present invention has been proposed to provide a color selecting mechanism for a cathode ray tube in which a state of elastic contact of a damper member with a tape-shaped grit piece constituting an aperture grill is maintained. It is.

[0019]

According to the present invention, a color selection mechanism for a cathode ray tube, which achieves the above object, comprises an aperture grille frame having an overall frame shape, and a plurality of tape-like grit pieces constituting an electron beam selection slit. And an aperture grill composed of a frame-shaped support portion for supporting these grit pieces, and is stretched along the aperture grill so as to elastically contact the grit piece and the support pieces on both sides of the support in an orthogonal state. And a resilient member attached to the aperture grille frame to urge the support piece in a direction away from the damper member.

According to the color selection mechanism for a cathode ray tube according to the present invention having the above-described configuration, the deformation of the support piece by the elastic member is corrected, so that the damper member with respect to the grit piece is corrected. The state of elastic contact is always maintained. Therefore, the color selection mechanism reliably suppresses the vibration generated in the aperture grill, and performs accurate control for guiding the electron beam emitted from the electron gun to each phosphor on the phosphor screen.

[0021]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, a color selection mechanism 1 according to an embodiment of the present invention includes an aperture grill 2, an aperture grill frame 3 for holding the aperture grill 2, and a vibration generated in the aperture grill 2. And a damper wire 4.

The aperture grill 2 is formed by forming a plurality of fine vertical stripe-shaped openings (hereinafter, referred to as slits) 5 in a thin plate such as a mild steel plate by an etching method, thereby forming a plurality of tape-shaped grit pieces (hereinafter, referred to as slits). , Called tape.)
6 and a frame-shaped support portion 7 for supporting these tapes 6.

As shown in FIG. 2, the aperture grill 2 has support pieces 7a (hereinafter, referred to as support tapes) 7a parallel to the tape 6 and an effective screen area 8 when assembled on the front panel of the cathode ray tube. Is formed with an extra slit 5a for guaranteeing the slit width at the extreme end. The extra slit 5a is constituted by an endmost tape 6a and a support tape 7a.

As shown in FIG. 1, the aperture grill frame 3 has an overall frame shape in which a pair of upper and lower beam frame members 3b, 3b are connected to a pair of left and right vertical frame members 3a, 3a, and is assembled. The front surface is formed as a cylindrical surface (cylindrical surface) so that the surface of the aperture grill 2 has a uniform curvature.

The aperture grille frame 3 is provided with wire mounting springs 9 for fixing the damper wire 4 at two locations above and below the outer surface of the vertical frame member 3a. The wire mounting spring 9 has a lower end portion at the vertical frame member 3a.
And a damper wire 4 is attached to an upper end portion. The damper wire 4 is attached to the wire attachment spring 9 in a slightly stretched state as described later.

The aperture grille frame 3 is provided with a leaf spring 10 which is fixed and supported when assembled to a front panel of a cathode ray tube (not shown), for example, a left and right vertical frame member 3a.
And it is attached to the outer surface of the lower beam frame member 3b.
The leaf spring 10 is formed to be bent substantially in a letter shape, and one end is spot-welded to each side of the aperture grille frame 3 so that the other end protrudes outward. Installed in a cantilevered state. The leaf spring 10 is provided with a system hole 10a corresponding to a panel pin provided on a front panel of a cathode ray tube (not shown). Therefore, the color selection mechanism 1 is combined with the inside of the front panel by making the system holes 10a of the leaf springs 10 provided in the aperture grille frame 3 relative to the panel pins.

The aperture grille frame 3 has a support tape 7 when the aperture grille 2 is assembled.
Support springs 11 are cantilevered at the four corners of the aperture grille frame 3 on the outer surfaces of the upper and lower beam frame members 3b located on the extension of the line a. The support spring 11 is formed of, for example, a metal material such as aluminum or stainless steel, and is formed of a material having sufficient elasticity to urge the support tape 7a in a direction away from the damper wire 4. As shown in FIG. 3, the support spring 11 includes a portion 11a horizontal to the aperture grill 2 having a substantially L shape and a portion 11b perpendicular to the aperture grill 2. The support spring 11 has a piece 11a provided with a projection 11c on the contact side of the support tape 7a and elastically contacts the upper surface of the support tape 7a. The support spring 11 has one part 1
1b is fixed to the vertical frame member 3a by spot welding or the like.

As shown in FIGS. 1 and 2, both ends of the damper wire 4 are attached to a wire attachment spring 9 of the vertical frame member 3a so as to be orthogonal to the tape 6 and the support tape 7a. The upper and lower damper wires 4 are stretched over the aperture grill 2 and are in elastic contact with the tape 6 and the support tape 7a at two upper and lower positions.

The color identification mechanism 1 configured as described above
The aperture grill 2 is attached to the aperture grill frame 3 by welding or the like so as to apply a predetermined tension. The color selection mechanism 1 absorbs expansion and contraction of the aperture grill 2 due to a temperature change by fixing the aperture grill 2 so as to apply a predetermined tension.

The color selection mechanism 1 has an aperture grill 2 attached to the front surface of the aperture grill frame 3 following the front surface thereof. In the color selection mechanism 1, as shown in FIG. 2, the damper wire 4 makes all the tapes 6 constituting the aperture grill 2 elastically contact with each other because the aperture grill 2 has a slight curvature. Therefore, the color sorting mechanism 1
The vibration generated in the tape 6 by the elastic force of the damper wire 4 is suppressed.

As shown in FIG. 4, in the color selection mechanism 1, the support spring 11 urges the support tape 7a in the direction away from the damper wire 4 via the protrusion 11c. The color selection mechanism 1 prevents the support spring 106 from deforming the support tape 106 a in the direction of pushing up the damper wire 4, so that all the tapes 105 come into contact with the damper wire 103.

Accordingly, as shown in FIG. 5, in the color selection mechanism 1, the deformation of the support tape 7a is corrected by the support spring 11, so that the elastic contact state of the damper wire 4 with the tape 6 is always maintained. 2 follows the ideal reference virtual curved surface 13. Since the vibration generated in the aperture grill 2 is reliably suppressed, the color selection mechanism 1 performs an accurate control for guiding the electron beam emitted from the electron gun of the cathode ray tube to each phosphor on the phosphor screen.

Note that the color selection mechanism 1 is not limited to such a configuration. As shown in FIG. 6, the color selection mechanism 1 has a structure in which support springs 12 are cantilevered at two places on the outer side surface located at the center of the left and right vertical frame members 3a constituting the aperture grille frame 3. It may be.

The support spring 12 is formed of the same material as the support spring 11 described above. As shown in FIG. 7, the support spring 12 has a substantially T-shape, and includes a portion 12 a that is horizontal to the aperture grille 2 having a substantially T-shape and a portion 12 b that is perpendicular to the aperture grill 2. The support spring 12 is provided with protrusions 12c at both ends on the contact side of the support tape 7a, and the support spring 12 is in elastic contact with the upper surface of the support tape 7a. The support spring 12 has one piece 12b fixed to the vertical frame member 3a by spot welding or the like.

The number of the color discriminating mechanisms 1 is not limited to the number of the support springs 11 and 12 attached. For example, the number of the color discriminating mechanisms 1 is sufficient for all the tapes 6 constituting the aperture grill 2 to contact the damper wires 4. You only need to have it. Further, the color identification mechanism 1 may have a configuration in which the support springs 11 and 12 are combined.

[0036]

As described above in detail, according to the cathode ray tube color selection mechanism of the present invention, the aperture grill frame is provided with the elastic member for urging the support piece in the direction away from the damper member. With this configuration, the deformed state generated in the support piece by the elastic member is corrected, and the elastic contact state of the damper member with the grit piece is always maintained. Therefore, the vibration generated in the aperture grille is reliably suppressed, so that the electron beam emitted from the electron gun of the cathode ray tube is accurately controlled to be directed to each phosphor on the phosphor screen, thereby preventing color unevenness occurring in the cathode ray. Is done.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating a configuration of a color identification mechanism shown as an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part showing a configuration of the same color identification mechanism.

FIG. 3 is a side view of a main part of the same color identification mechanism.

FIG. 4 is a vertical sectional view of a main part showing a configuration of the same color identification mechanism.

FIG. 5 is a sectional view of an essential part for explaining an ideal state of an aperture grill constituting the same color discrimination mechanism.

FIG. 6 is a perspective view illustrating another configuration of the same color identification mechanism.

FIG. 7 is a side view of another main part of the same color identification mechanism.

FIG. 8 is a perspective view illustrating a configuration of a conventional color identification mechanism.

FIG. 9 is a main part longitudinal sectional view for explaining an ideal state of an aperture grill constituting the same color discrimination mechanism.

FIG. 10 is a cross-sectional view illustrating a configuration of the same color identification mechanism.

FIG. 11 is a cross-sectional view illustrating a state in which an aperture grill constituting the same color discrimination mechanism deviates from an ideal state.

FIG. 12 is a cross-sectional view illustrating a deformed state of a support tape constituting an aperture grill of the same color identification mechanism.

FIG. 13 is a cross-sectional view of a main part illustrating a deformed state of a support tape constituting an aperture grill of the same color identification mechanism.

[Explanation of symbols]

1 color selection mechanism, 2 aperture grill, 3 aperture grill frame, 4 damper wire, 5 slit, 5
a Extra slit, 5b End slit, 6 tape, 6a End tape, 7a Support tape, 11
Support spring attached to upper and lower beam frame members, 12
Support spring attached to left and right beam frame members

Claims (3)

[Claims] 1. An aperture grille frame having an overall frame shape, an aperture grille including a plurality of tape-shaped grit pieces constituting an electron beam selection slit and a frame-shaped support portion supporting these grit pieces, A linear damper member stretched along the aperture grill so as to resiliently contact the grit piece and the support pieces on both sides of the support part in an orthogonal state; and the support piece attached to the aperture grill frame. An elastic member for urging the portion in a direction away from the damper member, wherein the elastic member corrects a deformed state generated in the support piece portion to thereby elastically contact the damper member with the grit piece. A color selection mechanism for a cathode ray tube, wherein 2. The color selection mechanism for a cathode ray tube according to claim 1, wherein the elastic member is cantilevered to left and right beam frame members constituting the aperture grille frame. 3. The color selection mechanism for a cathode ray tube according to claim 1, wherein the elastic member is cantilevered to upper and lower vertical frame members constituting the aperture grille frame.