JPH06223731A - Color picture tube - Google Patents

Abstract

PURPOSE:To hold a shadow mask to the inner side of a panel with a good reproducibility without reinforcing the strength of a mask frame, by specifying the forms of an elastic holder and a stud pin to compose a shadow mask holding means. CONSTITUTION:An elastic holder 33 installed at the center of the outer side surface of each side of a mask frame 26 consists of a pair of elastic holding pieces 35 with almost the same form, and a pair of fixing pieces 36 to install the holding pieces 35 to the outer surface of each side of the mask frame 26. A stud pin 34 is formed in a spool form making its center as a knot to the holder 33. As a result, even though the force in the direction to expand the interval between a pair of holding pieces 35 is not parallel to the center axis of the stud pin 34 when a shadow mask 24 is installed to a panel 21, a force to correct to make the force parallel to the center axis of the stud pin 34 is operated. As a result, since the holding pieces 35 are fitted and locked parallel to the center axis of the pin 34, the shadow mask can be held correctly with a good reproducibility, to plural numbers of connecting and disconnecting repeated in the manufacturing process of the color cathode-ray tube.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube, and more particularly to a color picture tube having an improved elastic support for supporting a color selection electrode such as a shadow mask.

[0002]

2. Description of the Related Art Generally, a shadow mask type color picture tube is provided on the inner surface of a panel 1 as shown in FIG.
Opposite the phosphor screen 2 composed of a color phosphor layer, a shadow mask 3 is attached to the inside thereof, and three electron beams 7B, 7G, which are emitted from an electron gun 6 arranged in a neck 5 of a funnel 4, 7R is deflected by a magnetic field generated by a deflection yoke 8 mounted on the outside of the funnel 4, and the three electron beams 7B, 7G, 7R are selected by the shadow mask 3 and the phosphor screen 2 is horizontally and vertically scanned. Due to
It is formed in a structure for reproducing a color image.

The shadow mask 3 comprises a mask body 10 having a large number of electron beam passage holes, and a mask body 10.
A mask frame 11 attached to the periphery of 10 and a plurality of elastic supports 12 fixed to the mask frame 11 are provided on the inner surface of the skirt portion 13 of the panel 1 as shown in FIG. It is detachably attached to the inside of the panel 1 by fitting and locking with a plurality of stud pins 14. As shown in FIG. 5, the support body 12 is formed by bending a strip-shaped elastic member, one end of which is a fixing portion 15 for the mask frame and the other end thereof is a locking portion 16, and the locking portion 16 is provided with the stud pin. 14 is formed in a structure in which a fitting hole portion 17 for fitting and locking is formed, while the stud pin 14 has the above-mentioned fitting hole portion.
It is formed in a shape having a tapered side surface 18 to which 17 is fitted.

The shadow mask is used to sort the three electron beams emitted from the electron gun so that they land correctly on the three-color phosphor layer of the phosphor screen. To secure the landing, In addition, the shadow mask is also used as an exposure mask when forming a phosphor screen by a photo printing method. Therefore, the shadow mask is repeatedly attached and detached a plurality of times when the phosphor screen is formed, and is finally incorporated in the tube. Therefore, as the elastic support 12 that supports the shadow mask,
The shadow mask must be supported on the inside of the panel with good reproducibility for repeated mounting and removal.

In order to support the shadow mask with good reproducibility as described above, the support body 12 is arranged so that the surface of the fitting hole portion 17 is perpendicular to the central axis of the stud pin 14, that is, the center of the stud pin 14. It is desired that the support 12 is press-fitted with elastic force so that the shaft and the central axis of the fitting hole 17 coincide with each other. However, the conventional support 12 changes with time due to fatigue or the like, and further, the support 12 is deformed into an arc when fitted and locked to the stud pin 14, so that the center axis of the stud pin 14 and the center of the fitting hole portion 17 are formed. Since the axes did not match, it was difficult to support the shadow mask inside the panel with good reproducibility.

Therefore, especially for a large-sized color picture tube or a high-definition color picture tube, the elasticity of the support body 12 is strengthened to increase the pressing force against the stud pin 14 at the time of fitting and locking, and the support body for the stud pin 14 is increased. 12 mating locks are stabilized. However, when the elasticity of the support body 12 is strengthened in this way, the mask frame is deformed, and the mask body is deformed by the deformation, which causes color misregistration, so that the strength of the mask frame is increased.

[0007]

As described above, the shadow mask of the color picture tube is selected so that the three electron beams originally emitted from the electron gun land correctly on the three-color phosphor layer of the phosphor screen. However, in order to secure the landing, it is also used as an exposure mask at the time of forming the phosphor screen, and the attachment / detachment is repeated a plurality of times. Therefore, the elastic support that supports the shadow mask must support the shadow mask inside the panel with good reproducibility with respect to repeated attachment and detachment.

As such a support, conventionally, a band-shaped elastic member is bent, one end of the elastic member is fixed to the mask frame, and the other end thereof is a locking portion, and the locking portion has an inner surface of the skirt portion of the panel. A stud having a fitting hole for fitting and locking the stud pin is used.

In order to support the shadow mask with good reproducibility by means of this support, it is press-fitted by elastic pressing force of the support so that the central axis of the stud pin and the central axis of the fitting hole portion of the support coincide with each other. Is desired. However, in the conventional support, the elasticity changes over time, and when the support is fitted and locked to the stud pin, it deforms into an arc shape and the center axis of the stud pin does not match the center axis of the fitting hole. It was difficult to support the shadow mask inside the panel with good performance. Therefore, especially for large color picture tubes and high-definition color picture tubes, the elasticity of the support is strengthened to increase the elastic pressing force against the stud pin at the time of fitting and locking, and the fitting and locking of the support to the stud pin. The strength of the mask frame has been increased in order to stabilize and prevent the deformation of the mask frame. Therefore, there is a problem that the weight of the color picture tube increases.

The present invention has been made to solve the above problems, and is an elastic support member capable of supporting a shadow mask inside a panel with good reproducibility without increasing the strength of the mask frame. It is intended to construct a color picture tube having a.

[0011]

A stud pin provided on a skirt portion of a panel and an elastic support member attached to a color selection electrode and having a fitting hole portion for fitting the stud pin are formed. By fitting the stud pin into the fitting hole of the elastic support, in the color picture tube in which the color selection electrode is detachably mounted inside the panel, the stud pin is formed in a pincushion shape or a barrel shape, The support is composed of a pair of curved or bent elastic support pieces, and abutted so that a space is formed between the pair of elastic support pieces,
Fitting holes each having a notch to be inserted into the stud pin were formed on the facing surfaces facing each other across the space.

[0012]

As described above, the stud pin is formed in a bobbin shape or a barrel shape, and the support body is composed of a pair of curved or bent elastic support pieces, and a space is formed between the pair of elastic support pieces. Butt so that the stud pin is formed, and the fitting holes that have notches for inserting into the stud pin are formed on the facing surfaces that face each other across this space, the center axis of the fitting hole is the center of the stud pin. The elastic support can be fitted and locked so as to coincide with the axis, and the color selection electrode that is repeatedly attached and detached can be correctly supported with good reproducibility.

Further, a pair of elastic supporting pieces of the supporting member are butted against a pin wound or barrel-shaped stud pin so that a space is formed between them, and the structure is formed so as to face each other across the space. Therefore, when it is fitted and locked to the stud pin,
The elastic pressing force of the support can be offset on the stud pin so that it does not reach the color selection electrode too much. Therefore, it is not necessary to increase the strength of the color selection electrode, and it is possible to prevent the weight of the color picture tube from increasing.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the drawings.

FIG. 1 shows a color picture tube which is an embodiment of the present invention. This color picture tube has an envelope composed of a substantially rectangular panel 21 having a skirt portion 20 formed in the peripheral portion and a funnel-shaped funnel 22 integrally joined to the panel 21, and the panel 21 Emit blue, green, and red light on the inside 3
A phosphor screen 23 including a color phosphor layer is provided, and a substantially rectangular shadow mask 24 (color selection electrode) is arranged inside the phosphor screen 23 so as to face the phosphor screen 23. The shadow mask 24 is composed of a mask body 25 having a large number of electron beam passage holes formed therein and a mask frame 26 having an L-shaped cross section and having an inwardly projecting portion attached to the peripheral portion of the mask body 25, which will be described later. It is detachably attached to the inside of the panel 21 by a mask supporting means. on the other hand,
Inside the neck 28 of the funnel 22, 3 electron beams 29B and 29G
, 29R emitting electron gun 30 is arranged. Then, the three electron beams 29B and 29 emitted from the electron gun 30
G and 29R are deflected by a magnetic field generated by a deflection yoke (not shown) mounted on the outside of the funnel 22, and the phosphor screen 23 is horizontally and vertically scanned to form a structure for displaying a color image. Has been done.

As shown in FIGS. 1B and 2, the mask support means includes an elastic support 33 attached to the central portion of the outer surface of each side of the mask frame 26, and the panel.
21 and a stud pin 34 provided on the inner surface of the skirt portion 20.

The support 33 includes a pair of elastic support pieces 35 having substantially the same shape, and a pair of the elastic support pieces 35.
It is composed of a pair of fixing pieces 36 for attaching to the outer surface of each side of 26.

Each supporting piece 35 is formed by bending a strip-shaped elastic member into a substantially trapezoidal shape, and a flat portion at the center thereof is provided with a stud pin 34.
A locking portion 38 that locks to the stud pin 34, and both ends of the locking portion 38 are fixed portions 39 that are mounted on the fixing piece 36. The locking portion 38 is provided with a fitting hole portion 40 for fitting and locking the stud pin 34. ing. The fitting hole portion 40 has a V-shape that opens to one side of the locking portion 38 of each support piece 35.
It comprises a V-shaped notch 41 and a fitting hole 42 for a stud pin 34 formed at the top of the notch 41. The support body 33 is formed by abutting the pair of support pieces 35 back to back and facing each other so that the locking portions 38 are parallel to each other and a space is formed between the locking portions 38, and the fixing portions 39 are closely attached to each other. The fixing pieces 36 are welded and fixed to the fixing portions 39 at both ends thereof. The fixing pieces 36 are each bent in a key shape. When the fixing pieces 36 are attached to the outer surface of each side of the mask frame 26 via the fixing pieces 36, the respective locking portions 38 of the pair of support pieces 35 are formed into the mask frame.
It is parallel to the side of 26.

With respect to the support 33, the stud pin 34 is
It is formed in a pincushion shape with the central portion as a constricted portion, and the large-diameter portion at one end thereof is embedded in the inner surface of the skirt portion of the panel.

The attachment / detachment of the shadow mask 24 by such a mask supporting means is performed as follows.

That is, a pair of elastic supporting pieces 35 facing each other with the space of the elastic supporting body 33 interposed therebetween are pressed toward each other to form V-shaped notches 41 formed in the respective locking portions 38. The space between the locking portions 38 is compressed until the small diameter portion of the stud pin 34 can be inserted. Then, after inserting the small diameter portion of the stud pin 34 into the fitting hole portion 42 through the V-shaped notch 41,
The pressure applied to the pair of elastic support pieces 35 is released. The pair of supporting pieces 35 whose pressure has been released are restored by elasticity, and are fitted and locked at predetermined positions of the pincushion-shaped stud pins 34 to support the shadow mask 24. Further, when removing the shadow mask 24 mounted as described above, the pair of support pieces 35 are pressed in a direction in which they approach each other to release the engagement and locking with the stud pin 34, and the V-shaped notch 41. It is carried out by pulling out from the stud pin 34 via the.

When the mask supporting means is constructed as described above, since the shadow mask 24 is mounted on the panel 21, the pressure for compressing the pair of elastic supporting pieces 35 of the elastic supporting body 33 in the directions approaching each other is released. Then, when the stud pin 34 is fitted and locked, the elastic force in the direction of widening the distance between the pair of support pieces 35 becomes parallel to the central axis of the stud pin 34. Even if the force in the direction of widening the distance between the pair of support pieces 35 is not parallel to the central axis of the stud pin 34, the resultant force of the reaction force generated at the contact portion with the stud pin 34 causes the stud pin 34 to move.
A correction force acts so as to be parallel to the central axis of the stud pin 34, and as a result, the elastic force in the direction of widening the distance between the pair of support pieces 35 is fitted and locked so as to be parallel to the central axis of the stud pin 34. .
Therefore, when the shadow mask 24 is supported by the mask supporting means configured as described above, the shadow mask 24 can be correctly supported with good reproducibility even when the shadow mask 24 is repeatedly attached and detached in the manufacturing process of the color picture tube.

Moreover, the support 33 acting on the stud pin 34
Since the elastic forces of the pair of support pieces 35 of the above are opposite to each other, when the support body 33 is fitted and locked to the stud pin 34, the elastic force of the support body 33 is offset on the stud pin 34, and the mask is removed. It hardly reaches the frame 26. Therefore, even for a large color picture tube or a high-definition color picture tube, the shadow mask 24 can be supported so that the strength of the mask frame is particularly strengthened and the weight thereof is not increased.

In the above-mentioned embodiment, the elastic support member is composed of a pair of elastic support pieces bent into a substantially trapezoidal shape, but this elastic support member has a pair of support pieces formed by curving a band-shaped elastic member. You may comprise.

Further, in the above-mentioned embodiment, the elastic support body is formed by abutting a pair of substantially trapezoidal elastic support pieces back to back so that the engaging portions of each support piece face each other through a space. Although the stud pin has a pincushion shape, the elastic support has a shape in which, for example, a pair of substantially trapezoidal elastic support pieces are butted against each other, while the stud pin is formed into a barrel shape, and the support and the stud are formed. Even if the pin supports the shadow mask, almost the same effect can be obtained.

[0026]

EFFECTS OF THE INVENTION A stud pin provided on a skirt portion of a panel and an elastic support member attached to a color selection electrode and having a fitting hole portion for fitting with the stud pin are formed. In the color picture tube in which the color selection electrode is detachably mounted inside the panel by fitting the stud pin in the fitting hole, the stud pin is formed in a pincushion shape or a barrel shape, and the support is It has a pair of curved or bent elastic support pieces, butts them so that a space is formed between the pair of elastic support pieces, and the stud pins are respectively attached to the opposing surfaces facing each other across the space. By forming a fitting hole with a notch for insertion, the support can be fitted and locked so that the center axis of the fitting hole matches the center axis of the stud pin, and color selection is repeated Reproducibly and correctly supporting electrodes Rukoto can.

Further, since the support body is formed so as to face the pincushion-shaped or barrel-shaped stud pin with the pair of elastic support pieces abutting against each other with the space portion interposed therebetween, when the stud pin is fitted and locked. It is possible to make the elastic pressing force of the support hardly reach the color selection electrode. Therefore, it is not necessary to increase the strength of the color selection electrode, and it is possible to obtain the effect of preventing an increase in the weight of the color picture tube.

[Brief description of drawings]

FIG. 1 (a) is a diagram showing a configuration of a color picture tube which is an embodiment of the present invention, and FIG. 1 (b) is a diagram showing a mask supporting means thereof.

FIG. 2 is a perspective view showing a support and a stud pin that constitute the mask support means.

FIG. 3 is a diagram showing a configuration of a conventional color picture tube.

FIG. 4 is a diagram showing a support structure of the shadow mask.

FIG. 5 is a perspective view showing a support and a stud pin that constitute the mask support means.

[Explanation of symbols]

 20 ... Skirt 21 ... Panel 23 ... Phosphor screen 24 ... Shadow mask 25 ... Mask body 26 ... Mask frame 33 ... Elastic support 34 ... Stud pin 35 ... Elastic support piece 36 ... Fixing piece 38 ... Locking part 39 ... Fixing Part 40 ... Notch fitting part 41 ... Notch 42 ... Fitting hole

Claims (1)

[Claims] 1. A stud pin provided on a skirt portion of a panel, and an elastic support member attached to a color selection electrode and having a fitting hole portion for fitting the stud pin,
In a color picture tube in which the color selection electrode is removably mounted inside the panel by fitting the stud pin into the fitting hole of the elastic support, the stud pin is wound or barrel-shaped. The elastic support body has a pair of curved or bent elastic support pieces, and the elastic support pieces are butted so as to form a space between the pair of elastic support pieces and sandwich the space. 2. A color picture tube, characterized in that fitting holes each having a notch to be inserted into the stud pin are formed on the facing surfaces facing each other.