JP3518134B2 - Cathode ray tube - 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 mounted on a color image receiver or the like, and more particularly to a structure of a support member for mounting a color selection mechanism on a phosphor panel.

[0002]

2. Description of the Related Art FIG. 6 is a perspective view showing a configuration example of a conventional cathode ray tube, and FIG. 7 is a perspective view showing a color selecting mechanism incorporated in the cathode ray tube. As shown in the drawing, the cathode ray tube 1 includes a phosphor panel 2 having a phosphor surface formed of R (red), G (green), and B (blue) color phosphors on the inner surface side, and a phosphor panel 2 of the phosphor panel 2. A color selection mechanism 3 mounted on the inner surface side,
It is composed of a funnel 5 joined to the phosphor panel 2 via a frit seal portion 4, and an electron gun 6 sealed in the neck portion of the funnel 5. Among these, the color selection mechanism 3 selectively passes the electron beam of each color emitted from the electron gun 6, and includes a color selection mask 7 in which a large number of small holes or slit holes are arranged in a pattern, and this color. It is composed of a frame 8 that supports the selection mask 7. A holder 9 is attached to the frame 8 of the color selecting mechanism 3.
A plate-shaped support member 10 is attached via the. The support member 10 is for mounting the color selection mechanism 3 on the phosphor panel 2, and has a locking hole 11 at one end thereof. On the other hand, a fixing pin 12 is provided on the inner peripheral surface of the phosphor panel 2, and the fixing member 12 is attached to the fixing pin 12.
The color selection mechanism 3 is mounted on the inner surface side of the phosphor panel 2 by fitting the 0 locking holes 11. As a method of fixing the support member 10 in the color selection mechanism 3, there is a case where the support member 10 is directly attached to the frame 8 without interposing the holder 9 therebetween as described above.

By the way, in the cathode ray tube 1 of this kind, the color selection mask 7 generates heat due to the collision of the electron beam at the time of its operation, and the heat is transmitted to the frame 8 and the frame 8 itself thermally expands to cause mislanding. To do. That is, as shown in FIG. 8, for example, in the case of the aperture grill system, when thermal expansion occurs in the frame longitudinal direction orthogonal to the phosphor stripes 13 formed on the inner surface of the phosphor panel 2,
Following this, the color selection mask 7 is also displaced. Then, an arbitrary slit hole at the position of G1 when not thermally expanded is displaced to the position of G2 by thermal expansion, and accordingly, the slit hole passes through the slit hole at the position of G1 and reaches a predetermined position on the phosphor screen. After the thermal expansion, the electron beam Eb colliding with P1 passes through the same slit hole displaced to the position of G2 and collides with the position of P2 on the fluorescent screen, which causes mislanding for the α distance. . Since this mislanding causes problems such as a decrease in brightness and color shift, some measures need to be taken.

Therefore, in the prior art, when the color selection mechanism 3 thermally expands due to the collision of the electron beam during the operation of the cathode ray tube 1, at the same time, the color selection mechanism 3 itself is operated by the phosphor panel 2.
Measures are taken to prevent mislanding by moving to the inner surface side, that is, the fluorescent surface side. Specifically, as shown in FIG. 8, the color selection mask 7 that was in the position shown by the solid line in the figure before the thermal expansion is advanced to the position shown by the broken line in the figure after the thermal expansion, and the heat in the longitudinal direction of the frame is increased. Measures for preventing mislanding due to thermal deformation (expansion, contraction) by arranging the position G2 of the slit hole after expansion on the orbit of the electron beam Eb before thermal expansion as shown by the broken line arrow in the figure. Has been taken.

[0005]

However, conventionally, as the structure of the supporting member 10 attached to the frame 8, a bimetal spring structure supporting member in which two kinds of metal plates having different coefficients of thermal expansion are bonded by welding is adopted. And
This bimetal part is expensive and has a difficulty in workability, which has been a major obstacle in reducing the cost of the cathode ray tube.

The present invention has been made to solve the above problems, and an object thereof is to prevent mislanding due to thermal deformation of a color selecting mechanism without employing a bimetal part as a supporting member. To do.

[0007]

In the cathode ray tube of the present invention, a plate-like support member for mounting the color selection mechanism on the inner surface side of the phosphor panel is welded to the color selection mechanism side. , A pair of bending marks that are composed of a locking part that is locked to the phosphor panel side and an intermediate part that connects these welding part and the locking part, and that defines the welding part, the locking part and the intermediate part Is a certain inclination with respect to the line segment along the width direction of the support member.
It is formed to be parallel to each other at an angle .

In the cathode ray tube having the above-mentioned structure, the color selection mechanism is heated during the operation while the welding portion of the supporting member is welded to the color selection mechanism side and the locking portion is locked to the phosphor panel side. When expansion occurs, the color selection mechanism moves to the panel inner surface (fluorescent surface) side together with the welded portion according to the forming direction of the pair of bending marks. Therefore, by appropriately setting the amount of movement of the color selection mechanism at the time of thermal expansion with a parameter including the formation direction of the above-mentioned bending mark, mislanding can be prevented as in the case of bimetal parts.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail with reference to the drawings. In the present embodiment, the same components as those in the above-mentioned conventional example will be described with the same reference numerals. FIG. 1 is a diagram for explaining an embodiment of a cathode ray tube according to the present invention. In FIG. 1, among the components of the cathode ray tube, a structure of a supporting member for mounting a color selecting mechanism particularly on a phosphor panel is shown. Is shown. In addition, (a) in FIG.
Of (c), (a) is a perspective view of the support member, (b) is a side view thereof, and (c) is a developed view thereof. Further, among the X, Y, and Z directions added to the drawing, The X direction indicates the longitudinal direction of the support member, the Y direction indicates the same width direction, and the Z direction indicates the same thickness direction.

The support member 20 shown in FIG. 1 has a thin plate shape and has a welded portion 21 welded to the color selection mechanism side.
And a locking portion 22 that is locked on the phosphor panel side, and an intermediate portion 23 that connects the welding portion 21 and the locking portion 22. In addition, the welded portion 21, the locking portion 22, and the intermediate portion 23 are partitioned by a pair of left and right bent marks 24. Then, each of the bend marks 24 is bent and formed at a predetermined angle, whereby the welded portion 2 is formed.
Predetermined step between 1 and locking part 22 (corresponding to locking height)
H is secured. This step H is necessary when the locking hole 25 provided in the locking portion 22 is fitted into the fixing pin on the phosphor panel side, and is appropriately set according to the initial bending angle at the bending mark 24. Is set.

Here, in the present embodiment, the pair of bend marks 24 that partition the welded portion 21, the locking portion 22 and the intermediate portion 23 as described above are predetermined with respect to the width direction of the support member 20 (Y direction in the drawing). Are formed in parallel with each other at an angle θ. The angle θ formed by the bending trace 24 and the member width direction Y is aimed at the mislanding amount (α amount in FIG. 8) due to thermal expansion of the color selection mechanism which is theoretically or experimentally grasped in advance, and the support member 20 is aimed at. Is an angle that is appropriately set in consideration of the coefficient of thermal expansion, the initial bending angle at the bending mark 24 (the inclination angle of the intermediate portion 23), the length L of the intermediate portion 23 in the member longitudinal direction X, and the like. .

2A and 2B are plan views for explaining the deforming action of the support member 20 having the above structure. In FIG. 2A, the state before deformation is shown, and FIG. 2B is the state after deformation. First, in the state of FIG. 2 (a), the welded portion 21, the locking portion 22 and the intermediate portion 23 are in the same plane, that is, the bend mark 24 is not bent at all, and the step H Is the minimum state. In the state before this deformation, the displacement amount of the welded portion 21 in the member width direction Y is zero with respect to the center position of the locking hole 25 of the locking portion 22. On the other hand, in the state of FIG. 2 (b), the portion of the bend mark 24 on the welded portion 21 side is bent at a right angle, and the portion of the bend mark 24 on the locking portion 22 side is bent at a right angle in the opposite direction. The above-mentioned step H is in the maximum state. In the state after this deformation, with respect to the center position of the locking hole 25 of the locking portion 22,
The displacement amount of the welded portion 21 in the member width direction Y is (L × si
nθ) / 2.

Next, the movement of the color selection mechanism due to the deformation of the support member 20 will be described with reference to FIG.
First, in each of the partitioned areas of the support member 20, the welded portion 21 is welded to the frame of the color selection mechanism directly or through the holder. Usually, spot welding is used for attachment to the frame, and thus welding marks 26 due to spot welding remain on the welded portion 21. Further, since the locking portion 22 is locked by fitting the locking hole 25 provided therein to the fixing pin on the phosphor panel side, even if the position of the locking hole 25 is thermally deformed or the like. It is a fixed position that does not displace.

In the state where the supporting member 20 is attached to the frame of the color selecting mechanism and the color selecting mechanism is mounted on the inner surface side of the phosphor panel via the supporting member 20 as described above, the color selecting mechanism is supported by thermal expansion. Due to the deformation of the member 20, the color selection mechanism itself exhibits the following movements. That is, FIG.
As shown in (a) to (c), in the stage before the color selection mechanism is thermally expanded, the center position of the locking hole 25 of the locking portion 22 is set according to the initial bending angle of the bending mark 24. On the other hand, the position of the welding mark 26 of the welded portion 21 is displaced by Δy in the member width direction Y, and a step difference of H in the member thickness direction Z is secured between the welded portion 21 and the locking portion 22. ing. When the color selection mechanism thermally expands from this state, the thermal expansion of the color selection mechanism is performed at the welding portion 21 on the opposite side to the support member 20 with the locking hole 25 of the locking portion 22 as the fixed position as described above. A pressing force corresponding to the direction is applied. Then, the support member 2
0 is displaced from the position shown by the solid line in the drawing to the position shown by the broken line in accordance with the direction of formation of the pair of bending marks 24, so that Δy becomes smaller in the member width direction Y and welding is performed at the center position of the locking hole 25. The mark 26 approaches, and the step H between the welded portion 21 and the locking portion 22 becomes small even in the member thickness direction Z.

As a result, the color selection mechanism fixed to the welded portion 21 is based on the center position of the locking hole 25 in the member width direction Y (center position of the fixing pin of the phosphor panel) in the Y'direction in the figure. Support member 2 for the color selection mechanism so that the phosphor screen of the phosphor panel is located on the side of this moving direction.
By setting the attachment state of 0, the color selection mechanism itself can be moved to the phosphor screen side by the deformation of the support member 20 simultaneously with the thermal expansion of the color selection mechanism. That is,
It is possible to obtain the same function and effect as the bimetal component by using the supporting member 20 made of a single material without adopting the bimetal component as in the conventional case.

Here, as the material forming the supporting member 20, any material can be adopted except the non-elastic material.
For example, when spring steel is adopted, there is a merit in mechanical design that appropriate elasticity can be easily obtained, and stainless steel (SUS material) is preferable in terms of material cost and workability. In the structure of the supporting member 20, if the pair of bending marks 24 are not formed in parallel with each other, a twisting is accompanied when the member itself is deformed, and it is extremely difficult to obtain a desired effect.

Next, a concrete mounting state of the supporting member 20 in the cathode ray tube will be described with reference to FIG. First, in FIG. 4A, fixing pins 12 are provided at four corners of the phosphor panel 2 in the longitudinal direction,
Corresponding to this, the supporting members 20 are also attached to the four corners of the color selecting mechanism 3 in the longitudinal direction of the frame. Here, regarding the attachment of the support member 20 to the color selection mechanism 3, the directions of the adjacent support members 20 at the respective ends in the longitudinal direction of the frame are opposite to each other, that is, as shown in FIG. 21 are butted and fixed to the frame 8 of the color selection mechanism 3 by welding. In addition, the formation angle (θ) of the pair of bend marks 24 and each bend mark 2
As shown in FIG. 4C, the position of the locking hole 25 of the locking portion 22 is greater than the position of the welding mark 26 of the welded portion 21 depending on the bending angle of the fluorescent surface of the phosphor panel 2 ( (Inside) is set to be close.

If the support member 20 is attached in such a state, when the color selection mechanism 3 thermally expands due to the collision of the electron beam during the operation of the cathode ray tube, the welded portion follows the operating principle of FIG. The step H between 21 and the locking portion 22 becomes smaller, and the color selection mechanism 3 comes closer to the phosphor screen side of the phosphor panel with the displacement of the weld portion 21. Therefore, even before and after the thermal expansion of the color selection mechanism 3, so that the electron beam passing through an arbitrary hole of the color selection mask 7 collides with a predetermined position on the phosphor screen, the parameters including the formation direction of each fold mark 24 are set. By defining the moving position of the color selection mask 7 after the thermal expansion under the conditions shown in FIG. 8, it is possible to prevent mislanding even with the support member 20 made of a single material, like the bimetal part. . If the supporting member 20 is made of a single material as described above, when the supporting member 20 is processed into a predetermined shape, the material is not wasted unlike a bimetal, which leads to a significant cost reduction.

Next, an application example of the Trinitron (registered trademark: Sony Corporation) type cathode ray tube will be described. Generally, in a trinitron type cathode ray tube (hereinafter referred to as a trinitron tube), a 4-pin type 3 + 1 pin type is mainly used as a method of mounting a color selection mechanism on a phosphor panel. In the case of the 3 + 1-pin type, fixing pins are provided at four positions on the top, bottom, left and right of the phosphor panel. Further, the locking direction of the support member with respect to each fixing pin is set to be the same direction on the upper side and the lower side, and the same direction on the left side and the right side.

Usually, in such a 3 + 1 pin type trinitron tube, a thermal deformation member in which two types of plates, a low thermal expansion metal plate and a high thermal expansion metal plate, are juxtaposed in the thickness direction in holders above and below the panel to which support members are welded. By adopting (bimetal parts), due to the bending of the holder due to the thermal expansion of the color selection mechanism,
Mislanding countermeasures such as bringing the color selection mechanism closer to the phosphor screen side are adopted. However, in the conventional case, for the support members on the left and right sides of the panel, a means for bringing the color selection mechanism such as a bimetal part closer to the phosphor screen side is not taken, and the movement of the color selection mechanism due to the bending of the upper and lower holders is followed. It is designed to be twisted and deformed. Therefore, the curved deformation of the upper and lower holders is hindered by the torsional stress of the left and right support members, and in many cases, the amount of movement of the color selection mechanism when approaching the phosphor screen side cannot be sufficiently secured.

Therefore, in the present embodiment, as shown in FIG. 5, the upper side and the lower side of the phosphor panel 2 are:
The support component 10 is welded and fixed to the color selection mechanism 3 (frame 8) via the holder 27 made of a bimetal component as in the conventional case, and the support member 20 according to the present invention is directly attached to the left and right sides of the phosphor panel 2. Alternatively, it is welded and fixed to the color selection mechanism 3 via a holder (not shown) made of a single material. Also in this case, each locking portion 22
The formation direction of the bending mark 24 and the mounting direction of the support member 20 were set so that the position of the locking hole 25 of the above was closer to the phosphor screen side than the position of the welding mark 26 of the welded portion 21.

In the Trinitron tube having the above structure, when the color selection mechanism 3 moves toward the phosphor screen side due to the bending of the upper and lower holders 27 due to the thermal expansion of the color selection mechanism 3, the movement of the color selection mechanism 3 is followed. The left and right support members 20 are smoothly deformed. As a result, the bending deformation of the upper and lower holders 27 is not hindered, and the color selection mechanism 3 interlocked with this bending deformation.
The movement operation of is performed more smoothly. As a result, the restriction on the amount of movement of the color selection mechanism 3 at the time of thermal expansion is greatly relaxed, and the effect of preventing mislanding and increasing the degree of freedom in mechanism design can be obtained.

In the present invention, the above-mentioned 3 + 1
Also in a cathode ray tube employing a 4-pin support system other than the pin type, for example, a so-called on-axis 4-pin support system in which the fixing pin 12 is arranged at an intermediate position of each side of the phosphor panel 2,
By mounting the support members 20 at the four positions on the top, bottom, left and right in a predetermined direction, mislanding due to thermal expansion of the color selection mechanism 3 can be prevented. Further, the present invention is applicable to any type of cathode ray tube, such as a cathode ray tube adopting a shadow mask method other than the aperture grill, as long as a color selection mask is attached to the inner surface side of the phosphor panel through a supporting member. Is also applicable.

[0024]

As described above, according to the present invention, a pair of bending marks of a supporting member including a welding portion, a locking portion and an intermediate portion are predetermined with respect to a line segment along the width direction of the supporting member.
Since they are formed parallel to each other with an inclination angle of
Upon thermal expansion of the color selection mechanism, the color selection mechanism can be moved to the panel inner surface (fluorescent surface) side in accordance with the direction of formation of the fold. As a result, mislanding can be prevented by using a supporting member made of a single material without adopting a bimetal part as in the conventional case, so that the cost of the cathode ray tube can be reduced.

[Brief description of drawings]

FIG. 1 is a diagram illustrating an embodiment of a cathode ray tube according to the present invention.

FIG. 2 is a plan view illustrating a deformation action of a support member.

FIG. 3 is a diagram for explaining the movement of the color selection mechanism due to the deformation of the support member.

FIG. 4 is a diagram illustrating a mounting state of a support member in a cathode ray tube.

FIG. 5 is a diagram illustrating another application example of the present invention.

FIG. 6 is a perspective view showing a configuration example of a conventional cathode ray tube.

FIG. 7 is a perspective view showing a color selection mechanism.

FIG. 8 is a schematic diagram illustrating mislanding.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cathode ray tube 2 Phosphor panel 3 Color selection mechanism 20 Support member 21 Welding portion 22 Locking portion 23 Intermediate portion 2
4 Bend marks

Continuation of the front page (56) Reference JP-A-6-103911 (JP, A) JP-A-54-159166 (JP, A) JP-A-62-229736 (JP, A) Actual development Shou 55-79058 (JP , U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01J 29/02

Claims (2)

(57) [Claims] 1. A cathode ray tube in which a color selection mechanism is mounted on the inner surface side of a phosphor panel via a plate-shaped support member, wherein the support member is a welded portion welded to the color selection mechanism side, A pair of locking parts that are locked to the phosphor panel side and an intermediate part that connects the welding part and the locking part, and that defines the welding part, the locking part, and the intermediate part The fold marks on the line segment along the width direction of the support member
A cathode ray tube, which is formed parallel to each other with a predetermined inclination angle . 2. The cathode ray tube according to claim 1, wherein the support member is made of a single material, spring steel.