JP2002117781A - Cathode ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cathode ray tube equipped with a heat compensating mechanism capable of obtaining as much compensation as possible in a restricted range in size when compensating miss-landing of an electron beam generated by thermal expansion of a color selecting mechanism. SOLUTION: This cathode ray tube has a flexible blade spring 17 one end part of which is connected to a stud pin 18 provided on the inner surface of the peripheral wall of a panel part 22 and the other end part of which is held on the color selecting mechanism side, and a spring holding member 16 to one end part of which the other end part of the blade spring 17 is connected, the other end part of which is connected to the prescribed position on the outside surface 19a of a frame 19, which comprises a flat body formed by laminating two materials having different coefficients of thermal expansion, and which is bent by a temperature rise. The spring holding member 16 is connected to the frame 19 so that a reference direction serving as a reference when bending inclines at a prescribed angle θrelative to the extending direction of C of the frame 19.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cathode ray tube. More specifically, the present invention relates to a cathode ray tube capable of correcting mislanding of an electron beam generated by thermal expansion of a color selection mechanism.

[0002]

2. Description of the Related Art Generally, in a color cathode ray tube,
In order to achieve good color uniformity, it is necessary to accurately land an electron beam passing through a slit of an aperture grill as a color selection mechanism on a desired phosphor. For example, three electron beams emitted from an electron gun and corresponding to three primary color signals are controlled by an aperture grille to control the beam irradiation width (arrival diameter), and red (R) and green formed inside the panel. (G), blue (B)
Landing on the three phosphors. By this landing, the phosphor emits R, G, and B colors. FIG.
1 is a perspective view of a cathode ray tube 50 having a color selection mechanism, that is, a so-called Trinitron (trade name) type cathode ray tube. The cathode ray tube 50 is provided with an aperture grill 2 shown in FIG. This aperture grill 2 is formed by forming a plurality of slits in a stripe shape on a thin metal plate. A pair of A members 8 constituting the AG frame 5 are attached to the upper and lower sides of the aperture grill 2, and a pair of vertical members 9 constituting the AG frame 5 are attached to the left and right sides of the aperture grill 2. It is supported to pull with great force. A member 8
A spring holder 6 that supports a plate-shaped spring 7 is attached to a predetermined location on the outer surface of the vertical member 9. A panel 1 having stud pins (not shown) is provided on the front side of the aperture grill 2, and the stud pins are supported by a spring 7, so that the aperture grill 2 and the AG frame 5 holding the same are mounted inside the panel 1. It is supported by. On the inner surface of panel 1,
A striped phosphor of three colors (not shown) of red, green and blue is formed. An integrated funnel 4 is joined to the panel 1 via a frit seal portion 10, and the electron gun 3 is built in the funnel 4.

By the way, the aperture grill 2 receives thermal energy by being irradiated with an electron beam,
This heat causes the aperture grill 2 to thermally expand. This heat is transmitted from the aperture grill 2 to the A member 8 and the vertical member 9 constituting the AG frame 5. When the temperature of the A member 8 rises, the aperture grill 2 spreads in the horizontal direction of the screen, and the position of the slit changes. Also,
The panel 1 also thermally expands due to the temperature rise. Due to these factors, the electron beam that has passed through the slit does not reliably land on the phosphor, and mislanding of the electron beam causes luminance degradation and chromaticity change of the CRT screen. For this reason, in order to suppress such a decrease in display quality, a bimetal is used for the spring holder 6 that holds the spring 7 that engages with the aperture grill 2, and the spring holder 6 is bent in accordance with a rise in temperature, and the aperture grill 2 is bent. The position of the slit with respect to the electron gun 3 is corrected by an aperture grill heat correction mechanism for moving the slit toward the panel 1.

FIG. 8 is a diagram showing an example of an aperture grill heat correction mechanism in which a spring holder 6 using a bimetal is connected to the A member 8 and the spring 7 is held by the spring holder 6. 8, the spring holder 6 is arranged so that the reference direction is orthogonal to the extension direction of the A member 8 arranged to face the inner surface 1a of the panel 1. The reference direction is a U-shaped notch 6 a formed at one end of the spring holder 6.
Is the forming direction. The spring holder 6 curves along this reference direction. The spring 7 has one end welded to the spring holder 6 and the other end attached to the panel 1.
A connection portion 7a to which a stud pin provided on the inner surface of the peripheral wall is connected is formed. When the spring holder 6 bends, the relative position between the A member 8 and the spring 7 having the connecting portion 7a connected to the stud pin changes, and the A member 8 moves toward the inner surface of the panel 1 and the position of the aperture grill 2 is changed. Is corrected. The amount of movement of the A member 8 is shown in FIG. 8, a spring holder 6 is determined by the effective length L ₀ is the length substantially bendable. The effective length L ₀ is a distance between a connection position between the spring holder 6 and the A member 8 and a connection position between the spring holder 6 and the spring 7.

[0005]

Recently, in order to reduce the weight and cost of cathode ray tubes,
As for the panel 1, efforts are being made to reduce the surplus portion and to reduce the height from the front surface of the panel 1 to the joint with the funnel 4 as much as possible. As the height is reduced, the size of the spring holder 6 in the longitudinal direction is also restricted. For this reason, the effective length L ₀ of the spring holder 6 is limited, the correction amount of the aperture grill 2 is limited, and there is a possibility that an appropriate correction for the mislanding of the electron beam may not be possible. Further, in a cathode ray tube having a small screen size, the effective length L ₀ of the spring holder 6 is inherently limited, so that it is difficult to secure a correction amount of the aperture grill 2.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and is intended to correct mislanding of an electron beam caused by thermal expansion of a color selection mechanism by correcting the position of the color selection mechanism. It is an object of the present invention to provide a cathode ray tube capable of correcting the position of a color selection mechanism beyond the restriction on the size of a curved spring holding member.

[0007]

A cathode ray tube according to the present invention is arranged opposite to a phosphor layer provided on an inner surface of a panel, and a color selection mask for selecting an electron beam incident on the phosphor layer; A cathode ray tube having a color selection mechanism including a frame that supports a selection mask, and support means for supporting the color selection mechanism with respect to the panel, wherein the support means has one end of the panel unit. The other end of the leaf spring is connected to an engaging portion provided on the inner surface of the peripheral wall, and the other end is connected to the color selection mechanism, and the other end of the leaf spring is connected to one end. A spring holding member having a second end connected to a predetermined position on the outer surface of the frame, the spring holding member being made of a plate-like body in which a plurality of materials having different coefficients of thermal expansion are laminated, and being curved by a rise in temperature; The member is a reference method used as a reference when bending. There, characterized in that it is connected to the frame so as to be inclined at a predetermined angle with respect to the extending direction of the frame.

The color selection mask is an aperture grill having a substantially rectangular outer shape in which a plurality of slits are formed in a stripe shape, and the frame includes a pair of first and second ends which hold both ends of the aperture grill in a slit forming direction. A first member member, and a pair of second member members connecting end portions between the pair of first member members, wherein the spring holding member is located at a predetermined position on an outer surface of the first member member. Each is fixed.

[0009] Preferably, a notch indicating the reference direction is formed at one end of the spring holding member.

The spring holding member is formed of a plate-like body in which a high thermal expansion material and a low thermal expansion material are laminated, and the low thermal expansion material is located on a side facing the outer peripheral surface of the frame.

[0011] Both ends of the spring holding member in the longitudinal direction are:
It is formed so as to be substantially parallel to the extension direction of the frame.

The spring holding member is fixed to the frame by welding.

In the present invention, the spring holding member is connected to the frame such that a reference direction, which is a reference when bending, is inclined at a predetermined angle with respect to the extension direction of the frame. For this reason, the bendable effective length of the spring holding member extends in accordance with the magnitude of the inclination angle. If the effective length is increased, it is possible to sufficiently secure the movement amount (correction amount) of the color selection mask due to the curvature of the spring holding member.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing a configuration of a cathode ray tube according to one embodiment of the present invention. The cathode ray tube 100 according to the present embodiment includes a panel 22 that constitutes a part of a tube body of the cathode ray tube, a phosphor layer 21 provided on an inner surface of the panel 22, and a phosphor layer 21 that is disposed to face the phosphor layer 21. Color selecting mechanism 40 having the color selecting mask 15 and the spring holding member 16 fixed to the frame 19 of the color selecting mechanism 40
A leaf spring 17 held by a spring holding member 16, a funnel 14 joined to the panel 22, and a funnel 14
And an electron gun 13 for irradiating the phosphor layer 21 with an electron beam EB.

FIG. 2 is a plan view showing the structure of the color selection mechanism 40. The color selection mechanism 40 has a substantially rectangular frame in which a pair of long side frames 19 extending in the horizontal direction (X direction) and a pair of short side frames 31 extending in the vertical direction (Y direction) are combined. And a color selection mask 15 held by the frame. The color selection mask 15 is a so-called aperture grill in which a plurality of slits are formed in a thin metal plate in a stripe shape along the Y direction. Both ends of the color selection mask 15 in the direction in which the slits are formed are fixed to the long side frame 19 by welding. Both ends of the pair of long side frames 19 are connected by short side frames 31.

At a predetermined position on the outer side surface 19a of each long side frame 19, a spring holding member 16 of a bimetal structure is fixed, and a leaf spring 17 is fixed to the spring holding member 16, respectively. The lower spring holding member 16 of the two spring holding members 16 has an HV contactor 17 made of a metal material for electrically connecting the color selection mechanism 40 and the carbon film formed on the inner surface of the funnel 14. Is fixed.

Similarly, the outer side surface 30a of the short side frame 30
The spring holding members 31 are fixed to predetermined positions, respectively, and the leaf springs 32 are fixed to the spring holding members 31 respectively. The spring holding member 31 does not have a bimetal structure.

The color selection mechanism 40 is held on the inner surface of the peripheral wall of the panel 22 via the spring holding member 16, the leaf spring 17, or the spring holding member 31, and the leaf spring 32. In particular,
As shown in FIG. 1, stud pins 18 are provided on the respective inner surfaces of the peripheral walls on the four sides of the panel 22, and the stud pins 18 are connected to the connection portions of the leaf springs 17 and 32.

FIG. 3 is a plan view showing the structure of the aperture grill heat compensating mechanism and showing the structure of the spring holding member 16 and the leaf spring 17 provided for the long side frame 19. FIG. 4 is a view showing the structure of the spring holding member 16, and FIG. 5 is a view showing the structure of the leaf spring 17. As shown in FIG. 4 (a), the outer contour of the spring holding member 16 is a parallelogram, and a U-shaped notch 16a is formed at one end. A reference line B along the direction in which the notch 16a is formed indicates the reference direction when the spring holding member 16 is curved. The spring holding member 16 is curved symmetrically with respect to the reference line B. By forming the notch 16a, the spring holding member 16 can be
Workability at the time of fixing by welding is improved. As described above, the spring holding member 16 has a parallelogram shape, and both ends in the longitudinal direction are substantially parallel to the extending direction of the long side frame 19. Therefore, by inclining the spring holding member 16, the spring holding member 16 does not protrude in the height direction of the panel 22. Further, when the spring holding member 16 is fixed to the long side frame 19 by welding, the direction of the spring holding member 16 can be easily determined.

As shown in FIG. 4B, the spring holding member 1
6 is a high thermal expansion material 161 and a low thermal expansion material 162
Is a laminated plate-like body. As the high thermal expansion material 161, for example, a metal material such as an Fe—Ni—Cr alloy is used. The low thermal expansion material 162 includes, for example, F
A metal material such as an e-Ni alloy is used. The low thermal expansion material 162 of the spring holding member 16 is
9 is directed to the outer surface 19a. Spring holding member 16
When the temperature rises, the stress difference between the high thermal expansion material 161 and the low thermal expansion material 162 causes the low thermal expansion material 162 to be concave and the high thermal expansion material 161 to be curved in a convex state.

As shown in FIG. 5, the leaf spring 17 has a connection portion 17a formed of a fitting hole into which a stud pin 18 is inserted at one end, and a first bent portion 17 at two locations in the longitudinal direction.
b and a second bent portion 17c. For this reason, the leaf spring 1
The height of the surface 17e on the one end side and the surface 17d on the other end side of 7 are different.

As shown in FIG. 3, the spring holding member 16
It is formed in a cantilever shape, and extends in a direction C in which the long side frame 19 extends.
Is fixed to the outer side surface 19a of the long side frame 19 so that the reference line B is inclined at the inclination angle θ. That is, the two welding portions 16b arranged in the extension direction C of the long side frame 19 located on one end side of the spring holding member 16 are
It is welded to the outer side surface 19a of the long side frame 19.

The leaf spring 17 is welded to the spring holding member 16 by three welding portions 17f. The leaf spring 17 is arranged so that its longitudinal direction is along the extension direction C of the long side frame 19.

In FIG. 3, the spring holding member 16 and the long side
A substantial connection position Pa with the frame 19;
Distance between the substantial connection position Pb with the spring holding member 16
Release L ₀ Then, it is caused by the curvature of the spring holding member 16.
The relative displacement between the connection position Pa and the connection position Pb is the connection position
Shortest distance L between Pa and connection position Pb₀ Not the baseline
B between the connection position Pa and the connection position Pb in the direction along B
It is determined by the distance L between them. That is, the distance L is
The effective length of the holding member 16. This effective length L is the spring holding
It is determined according to the inclination angle θ of the member 16. The inclination angle θ is 9
In the case of 0 degree, the reference line B is perpendicular to the extension direction C.
And the effective length L and the shortest distance L₀ Matches. Tilt angle θ
If it is made smaller than 90 degrees, the effective length L becomes the distance L₀ Yo
And increases as the inclination angle θ decreases.

Next, the principle of adjusting the distance between the aperture grill 15 and the panel 22 by the aperture grill heat compensating mechanism having the above configuration will be described with reference to FIG. FIG. 6A shows a distance H between the inner surface 22a of the panel 22 and the aperture grill 15 (hereinafter, referred to as grill height H).
FIG. 6 is a diagram for explaining the adjustment principle of FIG. 6A, a connection portion 17a of a leaf spring 17 fixed to a spring holding member 16 is connected to a stud pin 18 provided on a panel 22.
, The connecting portion 17a does not move. The spring holding member 16 is, for example,
Of the leaf spring 17 when it is bent by the temperature rise of
Assuming that 7a is not connected to the stud pin 18, the connecting portion 17a of the leaf spring 17 moves as shown in FIG.

At this time, assuming that the moving amount d of the connecting portion 17a of the leaf spring 17 in the grill height H direction is that the connecting portion 17a of the leaf spring 17 is actually connected to the stud pin 18, the aperture grill 15 moves. Panel 2 by amount d
Move towards 2. Thereby, the grill height H
Is adjusted.

Here, the effective length L of the spring holding member 16 is
It is clear that the longer the distance, the larger the movement amount d. For example, as shown in FIG. 6 (b), when extending the effective length L from L ₁ to L _2, the movement amount d is also increased from d ₁ to d _2, substantially proportional to the movement amount d and the effective length L It is in.

The operation of the aperture grill heat correction mechanism in the cathode ray tube according to the present embodiment will be described. When the electron beam EB is emitted from the electron gun 13 in a state where the cathode ray tube 100 is assembled as shown in FIG. 1, the electron beam EB is deflected in a predetermined direction by a deflection yoke (not shown), and The light is sorted by the sorting mechanism 40 and reaches the phosphor layer 21 provided on the inner surface of the panel 22. Then, the electrons absorbed by the aperture grill 15 of the color selection mechanism 40 are
The temperature of the aperture grill 15 is increased. Due to this temperature rise, the aperture grill 15 thermally expands.

When the temperature of the aperture grill 15 rises, heat is transmitted from the aperture grill 15 to the long side frame 19. Due to this heat, the long side frame 19 also thermally expands. Further, when the temperature of the long side frame 19 rises, heat is also transmitted to the short side frame 30 and thermally expanded. Due to the thermal expansion generated in the color selection mechanism 40, a mislanding occurs in which the electron beam EB emitted from the electron gun 13 does not reach a desired phosphor.

When the temperature of the long side frame 19 rises, the spring holding members 16 fixed to the upper and lower long side frames 19 begin to bend in accordance with the rise in temperature. Spring holding member 1
When the curve 6 is bent, the leaf spring 17 connected to the spring holding member 16 also tries to move accordingly.

However, the leaf spring 17 is connected to the stud pin 18 of the panel 22. For this reason, the leaf spring 17 is elastically deformed according to the curvature of the spring holding member 16.
The force due to the elastic deformation of the leaf spring 17 is equal to the grill height H.
And the grill height H corrects the mislanding of the electron beam EB.

In the present embodiment, the reference line B of the spring holding member 16 is provided not to be perpendicular to the extending direction C of the long side frame 19 but to be inclined at the inclination angle θ.
The effective length of the spring holding member 16 can be extended while the spring holding member 16 is kept within the restricted range. For this reason, according to the present embodiment, for example, even when it is desired to reduce the height from the front surface of the panel 22 to the joint with the funnel 14 to reduce the weight of the panel 22, the inclination angle θ is adjusted. By doing so, it is possible to easily respond. In addition, since the adjustment amount of the grill height H is determined by the inclination angle θ of the spring holding member 16, even after the assembly of the cathode ray tube is completed, it is necessary to confirm the adjustment amount of the grill height H from the inclination angle of the spring holding member 16. Can be.

When the size of the cathode ray tube is small, such as a small cathode ray tube, the height of the panel is low, so that the spring holding member 16 is inherently limited in size.
By employing the configuration of the present embodiment, the adjustment amount (correction amount) of the grill height H can be increased without changing the overall length of the spring holding member 16.

[0034]

According to the present invention, when the mislanding of the electron beam generated due to the thermal expansion of the color selection mechanism is corrected by the position correction of the color selection mechanism, the dimension of the curved spring holding member is restricted. , The position of the color selection mechanism can be corrected.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a cathode ray tube according to an embodiment of the present invention.

FIG. 2 is a plan view showing a configuration of a color selection mechanism.

FIG. 3 is a plan view illustrating a configuration of an aperture grill heat correction mechanism.

FIG. 4 is a view showing a structure of a spring holding member 16;

FIG. 5 is a view showing a structure of a leaf spring 17;

FIG. 6 is a view for explaining a principle of adjusting a grill height H;

FIG. 7 is a perspective view of an example of a cathode ray tube 50 having a color selection mechanism.

FIG. 8 is a diagram illustrating an example of a heat correction mechanism of the aperture grill.

[Explanation of symbols]

100: cathode ray tube, 22: panel, 21: phosphor layer, 4
0: color selection mechanism, 15: aperture grill, 13: electron gun, 14: funnel, 16: spring holding member, 17: leaf spring, 18: stud pin.

Claims (6)

[Claims] A color selection mask disposed opposite to a phosphor layer provided on an inner surface of the panel, the color selection mask selecting an electron beam incident on the phosphor layer; and a frame supporting the color selection mask. A cathode ray tube having a mechanism and a support means for supporting the color selection mechanism with respect to the panel, wherein the support means has an end portion provided on an engaging portion provided on an inner surface of a peripheral wall of the panel portion. A flexible leaf spring, the other end of which is connected to the color selection mechanism side; and the other end of the leaf spring is connected to one end, and the other end is a predetermined outer surface of the frame. A spring holding member that is connected to a position and is made of a plate-like body in which a plurality of materials having different coefficients of thermal expansion are stacked, and that is curved by a rise in temperature. Direction is relative to the extension direction of the frame A cathode ray tube, which is connected to the frame so as to be inclined at a predetermined angle. 2. The color selection mask is an aperture grill having a substantially rectangular outer shape in which a plurality of slits are formed in a stripe shape, and the frame has a pair of ends that hold both ends of the aperture grill in a slit forming direction. A first member member, and a pair of second member members connecting end portions between the pair of first member members, wherein the spring holding member has a predetermined outer surface of the first member member. 2. The cathode ray tube according to claim 1, wherein the cathode ray tubes are fixed at respective positions. 3. The cathode ray tube according to claim 1, wherein a notch indicating the reference direction is formed at one end of the spring holding member. 4. The spring holding member comprises a plate-like body in which a high coefficient of thermal expansion material and a low coefficient of thermal expansion material are laminated, and the low coefficient of thermal expansion material is located on a side facing an outer peripheral surface of the frame. The cathode ray tube according to claim 1, wherein 5. Both ends of said spring holding member in the longitudinal direction are:
The cathode ray tube according to claim 1, wherein the cathode ray tube is formed so as to be substantially parallel to a direction in which the frame extends. 6. The cathode ray tube according to claim 1, wherein said spring holding member is fixed to said frame by welding.