JP2003324668A - Crt display device and front cabinet for crt display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a CRT display device which can reliably present a gap between the peripheral edge of an opening window part of a front cabinet and an image display face of a CRT display tube without hindering miniaturization of the front cabinet, simplification of a structure, and reduction of costs or the like, and also to provide the front cabinet for the CRT display device. <P>SOLUTION: The positional relation between a lever rib 104 and pressing plate member holding parts 105a, 105b is set so that a pressing plate member 106 is inserted in between a face to which the pressing plate member 106 is pressed at the lever rib 104 and the face to hold the pressing plate member 106 at the pressing plate member holding parts 105a, 105b. The device is set so that the edge 116 on the opening window part 101 side of the window frame part 102 on the base side is pressed to the front face of the CRT display tube 300 by inserting the pressing plate member 106 between the faces. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CRT display device and a front cabinet for the CRT display device.

[0002]

2. Description of the Related Art In a television set (television receiver), a display device for a desktop personal computer, or the like, a CRT (Cathode) is used as a display device.
Ray Tube) Display tubes are often used. That CRT
A front cabinet is attached to the front side of the display tube for displaying an image.

The front cabinet is generally a CRT.
An opening window portion that exposes the image display region of the display tube to the front surface is provided, and a portion around the opening window that is not substantially involved in image display is covered with the window frame portion. The front cabinet is set so as to be attached to the CRT display tube in a state where the peripheral edge of the opening window portion is along the shape of the front surface of the CRT display tube without a gap.

Behind the front cabinet is a CRT
A rear cabinet that accommodates the latter half of the display tube is assembled, and a CRT display tube, a circuit system for displaying an image on the CRT display tube, and components such as switches and lead wires are stored. Parts are made up.

Such a cabinet for a CRT display device is generally manufactured by injection molding a plastic material such as styrene resin or ABS resin so that mass production is possible. Alternatively, for example, in order to produce a high-class appearance, a metal plate such as an aluminum plate, which is relatively easy to process and has a high degree of freedom in forming, is manufactured by pressing.

[0006] Such a cabinet hides a part, a circuit system and parts which are not involved in the display of the CRT display tube, and adjusts the overall appearance of the CRT display device.

However, in such a CRT display device or a front cabinet for a CRT display device, the so-called front cabinet on the front side having the display screen is always exposed to the eyes of the user. If there is a gap between the image display surface of the CRT display tube and the image display surface of the CRT display tube, there is a possibility that the appearance becomes remarkably unsightly. In particular, if there is a gap at the bottom of the four sides of the screen, the bottom is most noticeable to the user, and is therefore most unsightly.

Particularly in recent years, the size of the screen has been increasing,
Further, it is required to reduce the weight of the entire device. Further, in order to establish a disposal method in consideration of environmental problems of electric appliances, there is a tendency that the front cabinet or the like is formed of a soft material that is easily crushed or thinned. Therefore, as shown in FIG. 21, the central portion of the front cabinet 211 tends to be deformed or deformed in the outward warp direction, and the probability that a gap is formed in the central portion tends to increase. On the contrary, as shown in FIG. 22, when the central portion of the front cabinet 211 is distorted or deformed in the inward direction or is deformed, no gap is formed in the central portion, but the left and right ends are not formed. There may be a gap. In general, the front surface of the CRT display tube 212 for displaying an image generally has a gentle curved shape in the outward warp direction, and therefore the front cabinet 211 is formed in a gentle outward warp shape so as to match the curved surface. In general, the central portion of the front cabinet 211 is often distorted or deformed in the outward warp direction.

Further, of the four edges of the opening window portion of the front cabinet 211, in particular, the edge 213 of the lower edge.
If there is a gap that allows the entry of water droplets or dust, the water droplets or dust will enter the inside of the front cabinet 211 through the gap, causing a short circuit (electrical short circuit) or a component in the circuit system. There is also a possibility that it may be a factor that causes deterioration of the class.

In the prior art, in order to eliminate or improve the above-mentioned inconvenience, and in order to prevent the occurrence of a gap, as shown in FIG.
An elongated sheet metal 232 is fixed (backed) to the back surface of the window frame portion 231 at the bottom of the front side of the window frame 231 at the bottom of the front cabinet 211 due to the material mechanical rigidity of the sheet metal 232. Window frame 231
Warp and distortion of the front cabinet 211
There may be a case where a measure is taken to prevent a gap from being generated between the edge 213 of the opening window part and the image display surface of the CRT display tube 212.

Further, for example, in Japanese Patent Application Laid-Open No. 10-271415, the shape and dimensions of the front cabinet are
In the state where the front cabinet is attached to the CRT display tube, a deformation correction amount is estimated in advance so that no gap is created between the peripheral edge of the opening window of the front cabinet and the image display surface of the CRT display tube. The technique of setting in advance has been proposed.

Further, in Japanese Unexamined Patent Publication No. 10-233980, even if a gap is formed between the peripheral edge of the opening window portion of the front cabinet and the image display surface of the CRT display tube, a water droplet that intrudes through the gap causes the circuit system to enter. A technique has been proposed in which a protrusion is provided to positively guide the user to bypass and pass to the bottom surface.

[0013]

However, in the technique disclosed in Japanese Unexamined Patent Publication No. 10-271415, the shape and dimensions of the opening window portion and the window frame portion of the front cabinet are set in advance in consideration of the deformation correction amount. However, in reality, there are many cases in which unexpected deformation occurs due to the deformation after molding or the environment. More specifically, various factors such as differences in material and size and shape between product lots, and differences in environment such as temperature during manufacturing are intricately entangled with each other. Since the distortion does not always occur, a deformation different from the deformation correction amount predicted in advance occurs, and as a result, the deformation occurs between the peripheral edge of the opening window of the front cabinet and the image display surface of the CRT display tube. It is difficult to reliably avoid the formation of the gap.

Further, in the technique disclosed in Japanese Patent Application Laid-Open No. 10-233980, even if a water drop intrudes through the gap between the peripheral edge of the opening window of the front cabinet and the image display surface of the CRT display tube, Even if it is possible to eliminate or improve the adverse effect on the circuit system, components, etc. inside the cabinet, the fact that the gap is generated does not fundamentally eliminate itself. Therefore, it is not possible to eliminate the inconvenience that a gap is formed between the peripheral edge of the opening window portion of the front cabinet and the image display surface of the CRT display tube, which makes the appearance significantly unsightly.

Further, in the conventional technique in which the elongated metal plate 232 is fixed to the back surface of the bottom of the window frame portion of the front cabinet 211 over substantially the entire width in the horizontal longitudinal direction,
A room for installing the sheet metal 232 must be newly provided inside the front cabinet 211, but in general, there is a strong demand for downsizing, simplification of structure, and cost reduction of the cabinet 211.
There is a problem that adding the sheet metal 232 to such a request is a significant obstacle.

Since a degauss coil and other wiring (all not shown) are often housed on the back side of the front cabinet 211, if a sheet metal 232 is attached at that position, the edge of the sheet metal 232 is attached. May come into contact with the degauss coil, other wiring, or the like to damage the coating, resulting in an electrical short circuit or an adverse electromagnetic effect. Alternatively, the sheet metal 232 may cause a magnetic adverse effect on the landing of the CRT display tube 212.

The present invention has been made in view of the above problems, and an object thereof is to provide a peripheral edge of an opening window portion of a front cabinet without hindering downsizing of the front cabinet, simplification of structure, cost reduction, and the like. An object of the present invention is to provide a CRT display device and a front cabinet for the CRT display device capable of reliably preventing a gap from being formed between the CRT display tube and the image display surface.

[0018]

A CRT display device according to the present invention comprises a CRT display tube for displaying an image on the front surface, and a CRT display device.
A front cabinet that is attached to the front surface of the display tube and has an opening window portion that exposes the image display area of the CRT display tube to the front side and has a window frame portion that surrounds the opening window portion; A CRT display device having a rear cabinet attached to the rear side and housing a CRT display tube, the front cabinet comprising:
Reinforcing ribs provided to reinforce the flexural rigidity in the direction orthogonal to the longitudinal direction of the window frame portion at the approximate center of the bottom of the four sides of the window frame portion and the reinforcing ribs. On the other hand, the lever rib provided in a shape protruding inward toward the rear surface side of the window frame portion in a substantially L-shape and the force for pressing the lever rib to deform the reinforcing rib toward the rear surface side of the window frame portion. A push plate member to be applied to the lever rib and a push plate member holding portion for receiving the reaction force applied from the lever rib to the push plate member and holding the state in which the push plate member is pressed against the lever rib. The lever rib and the holding plate member are held so that the pressing plate member is interposed between the surface of the lever rib against which the pressing plate member is pressed and the surface of the pressing plate member holding portion that holds the pressing plate member. The position relationship with the parts is set and the push plate member is pressed against the lever rib. The force applied to the lever ribs is transmitted to the reinforcing ribs by deforming the bottom side of the window frame part to the back side together with the reinforcing ribs, and the bottom side of the window frame part on the opening window side It is set so that the edge of the CRT is pressed against the front surface of the CRT display tube.

Further, the front cabinet for a CRT display device according to the present invention is attached to the front surface of a CRT display tube for displaying an image, and has an opening window portion for exposing the image display area of the CRT display tube to the front side. A front cabinet for a CRT display device that has a window frame portion that surrounds the opening window portion, and is orthogonal to the longitudinal direction of the window frame portion at approximately the center of the bottom side of the four sides of the window frame portion. Reinforcing ribs provided to reinforce flexural rigidity in the direction,
Lever ribs that are provided in a shape that extends in a substantially L-shape with respect to the reinforcing ribs and that protrude toward the rear surface side of the window frame portion, and the reinforcing ribs are pressed against the reinforcing ribs to move the reinforcing ribs to the rear surface side of the window frame portion. The force for deforming the lever plate is applied to the lever ribs, and the reaction force applied from the lever ribs to the lever plate is received to maintain the state in which the lever plate is pressed against the lever ribs. A pressing plate member holding portion is provided, and the pressing plate member is interposed between a surface of the lever rib against which the pressing plate member is pressed and a surface of the pressing plate member holding portion which holds the pressing plate member, The positional relationship between the lever ribs and the push plate member holding portion is set, and by pressing the push plate member against the lever ribs, the force applied to the lever ribs is transmitted to the reinforcing ribs, and together with the reinforcing ribs, the window frame. Deform the bottom side of the part to the back side, and open the window at the bottom of the window frame part. Are set side edges so abutted to the front surface of the CRT display tube.

CRT display device or CRT according to the present invention
In the front cabinet for a display device, when the pressing plate member is inserted between the surface of the lever rib against which the pressing plate member is pressed and the surface of the pressing plate member holding portion which holds the pressing plate member, the pressing plate member The force applied to the lever rib is transmitted from the lever rib to the reinforcing rib. At this time, since the lever ribs and the reinforcing ribs are substantially L-shaped, the pushing plate member pushes down the lever ribs to the bottom side (lower side) of the front cabinet. A rotation moment is obtained which causes the window frame portion to rotate to the front surface of the CRT display tube (in other words, to the rear surface side of the window frame portion) about the lower end of the frame portion as a central axis. The rotation moment deforms the bottom side of the window frame part to the back side together with the reinforcing ribs, and the edge of the bottom side of the window frame part on the side of the opening window part is pressed (pressed) to the front surface of the CRT display tube. By that, CRT
The gap between the front surface of the display tube and the edge of the bottom of the window frame on the side of the opening window is closed.

Here, in order to make the action of the lever rib more effective, it is desirable that the lever rib is provided at a position close to the bottom surface which is bent and connected from the lower end of the front cabinet. When the lever ribs are installed close to each other, in order to avoid the movement of the lever ribs from being obstructed by the bottom surface of the front cabinet, or due to the movement of the lever ribs, the bottom surface around it is curved or distorted downward. To avoid dripping, it is desirable to separate the bottom surface and the lever rib by a notch or hole. Alternatively, the portion between the bottom surface and the lever rib may be thinned so that the lever rib can move freely without deforming the other bottom surface.

The push plate member is interposed between the surface of the lever rib against which the push plate member is pressed and the surface of the push plate member holding portion which holds the push plate member. At this time, the push plate member is smooth. The lever rib is tapered or wedge-shaped so that the surface of the lever rib against which the push plate member is pressed to be inserted smoothly (smoothly) is a surface inclined with respect to the inserting direction of the push plate member. You may.

Further, in order to prevent the push plate member from falling after being inserted as described above, it is desirable to provide the push plate member holding portion with a locking claw for locking the push plate member.

The CRT display device is generally a board bracket for mechanically holding a wiring board having a circuit system for displaying an image on the CRT display tube or a component housed inside the CRT display device. Since it has a chassis to which is mounted, even if the above push plate member is attached to or integrally formed with the board bracket or chassis, addition of parts such as a separate push plate member can be omitted. Good.

In addition to the center of the bottom window frame portion as described above, the lever rib, the push plate member holding portion, and the push plate member are at least one of the left and right sides of the center, or You may make it provide further in both.

In addition to the bottom side of the window frame, the lever rib, the push plate member holding portion, and the push plate member are provided on at least one of the other three sides such as the top side and the left and right sides.
Further, it may be provided.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a CR according to an embodiment of the present invention.
1 shows a schematic configuration of a T display device. Since the CRT display device front cabinet according to the embodiment of the present invention is used for this CRT display device, they will be described below together.

This CRT display device is used as a display device such as a television image receiving device, for example, a front cabinet 1 made of plastics.
00, a rear cabinet 200 made of the same material as the front cabinet 100, and a CRT display tube 300 for displaying an image.

A cabinet (housing) 400 of this CRT display device is a combination of a front cabinet 100 and a rear cabinet 200. The front cabinet 100 and the rear cabinet 200 are made of plastics in consideration of the general characteristic that a large amount of inexpensive products can be manufactured by preparing an injection mold and injection molding equipment. desirable.

However, it goes without saying that the present invention is not limited to this. In addition to this, it is also possible to press a thin sheet metal such as an aluminum alloy plate or a brass plate. In that case, it is often necessary to manufacture the reinforcing ribs 103, the leverage ribs 104, and the push plate member holding portion 105, which will be described later, as separate components from the main body of the front cabinet 100. Therefore, in order to avoid such an increase in the number of parts and an increase in cost due to the increase in the number of parts, it is desirable to use a material such as plastics that can be integrally formed and has a high degree of freedom in shape.

The CRT display tube 300 is a combination of a front panel 301 having a gentle curved surface for displaying an image on the front side and a rear panel 304 provided with an electron gun 302 and a deflection coil 303 on the back side thereof, and has a predetermined inside. A so-called CRT (Cathode Ray) with a general structure in a vacuum state.
Tube).

The front cabinet 100 is attached to the front surface of the CRT display tube 300, and as shown in FIG. 1 or 2, the opening window portion 101 for exposing the image display area of the CRT display tube 300 to the front side. And a window frame portion 102 surrounding the opening window portion 101.

As shown in FIG. 3, the reinforcing ribs 1 are provided on the bottom (lower side) of the four sides of the window frame 102, which are the upper, lower, left and right sides.
03, lever rib 104, push plate member holding portion 105a,
105b are provided. All of them are extremely small, and when the front cabinet 100 is made of an injection moldable material such as plastics, it can be integrally molded with the front cabinet 100.

The surface (upper surface) of the lever rib 104 against which the push plate member 106 is pressed and the push plate member holding portion 105a,
Surface (bottom surface) of 105b for holding the push plate member 106
A push plate member 106 is interposed between the and. By inserting the push plate member 106, the lever ribs 104 are pushed down, and the pushing-down force becomes a rotation moment that tilts the reinforcing ribs 103 toward the rear surface side of the window frame portion 102, and the window frame at the bottom thereof. Opening window section 101 of section 102
The side edge 116 is pressed (pressed) onto the front surface of the CRT display tube 300.

More specifically, the front side of the window frame portion 102 at the bottom of the front cabinet 100 is substantially centered in the longitudinal direction so as to reinforce the flexural rigidity in the direction orthogonal to the longitudinal direction of the window frame portion 102. Reinforcing ribs 103 are provided. The reinforcing rib 103 may have a substantially triangular shape whose side surface is tapered as it approaches the edge 116 (upper side) of the window frame 102, as shown in FIG. 3, or as shown in FIG. As shown, the height (the size protruding from the back surface of the window frame portion 102 to the inside of the front cabinet 100) may be a substantially rectangular parallelepiped shape.

A lever rib 104 is formed integrally with the reinforcing rib 103 so as to be continuous in an L-shape and has a shape projecting to the rear surface side of the window frame portion 102.
As shown in FIG. 3 or 5, the lever rib 104 is formed into a tapered shape (or a wedge shape) so that the lever rib 104 has a surface inclined with respect to the insertion direction of the pressing plate member 106. . This is the upper surface of the lever rib 104 against which the push plate member 106 is pressed and the push plate member holding portion 105.
The pressing plate member 106 is inserted between the a and 105b and the lower surface holding the pressing plate member 106. At this time, the pressing plate member 106 in the lever rib 104 is inserted so that the pressing plate member 106 can be smoothly inserted. This is because the upper surface to be pressed is a surface inclined with respect to the insertion direction of the pressing plate member 106.

Alternatively, for example, as shown in an example in FIG. 6, the external shape of the lever rib 104 is a rectangular parallelepiped, and the angle θ formed by the lever rib 104 with respect to the back surface of the window frame portion 102 is a right angle. The angle (θ <90 degrees) may be set so that the surface of the lever rib 104 against which the pressing plate member 106 is pressed is a surface inclined with respect to the insertion direction of the pressing plate member 106.

Here, in the example shown in FIG. 3, two auxiliary lever ribs 107a and 107b, which are auxiliary, are provided on both sides of the main lever rib 104 as a center. The pressing force applied by the member 106 is shared by the two auxiliary lever ribs 107a and 107b in addition to the main lever rib 104, so that the main lever rib 104 is damaged even when a stronger pressing force is applied. This is to prevent distortion or distortion. In some cases, two auxiliary lever ribs 10 as shown in FIG.
It goes without saying that 7a and 107b may be omitted and only the central main lever rib 104 may be provided as shown in FIG.

Alternatively, as shown in FIG. 8, the main lever rib 104 at the center is replaced with the auxiliary lever ribs 107a,
The reinforcing rib 103 may be formed so wide as to include 107b, and the reinforcing rib 103 may be formed so as to be wide accordingly.

The push plate member 106 is inserted between the inclined upper surface of the lever rib 104 and the lower surface of the push plate member holding portions 105a and 105b for holding the push plate member 106, and the push rib member 104 has a bottom surface 110. It is a plate-shaped object that is set to apply a force that pushes it down. The left and right ends in the longitudinal direction are separately pressed plate member holding portions 105a,
It is supported by 105b.

The push plate member 106 is interposed between the upper surface of the lever rib 104 against which the push plate member 106 is pressed and the lower surface of the push plate member holding portions 105a and 105b holding the push plate member 106. However, it is desirable to provide the lever ribs 104 at a height (lower position) closer to the bottom surface 110 of the front cabinet 100, and similarly for the push plate member holding portions 105a and 105b, a height closer to the bottom surface 110 of the front cabinet 100. Since it is desirable to provide it in the (lower position), in order to satisfy both of these conditions, it is desirable to have a shape formed by bending into a gull wing shape as shown in FIG. 3 or 9.

However, the present invention is not limited to this, and as shown in an example in FIG. 10, the upper surface of the lever rib 104 against which the pressing plate member 106 is pressed and the pressing plate member holding portion 105.
It is also possible that the lower surfaces of a and 105b holding the push plate member 106 have substantially the same height, and the flat push plate member 106 is inserted at the position of the height.

Alternatively, as shown in FIG. 11, the upper surface of the lever rib 104 against which the pressing plate member 106 is pressed is slightly lower than the lower surface of the pressing plate member holding portions 105a and 105b holding the pressing plate member 106. As the pressing plate member 106, a plate-shaped member made of an elastic material is used, and the pressing plate member 106 in the lever rib 104 is pressed against the pressing plate member 106 while slightly bending in the longitudinal direction by the elasticity. Upper surface and push plate member holding portion 10
You may make it interpose between 5a and 105b and the lower surface holding the push plate member 106.

By doing so, the window frame 102
The pressing force of the edge 116 of the push-button member 10 against the front surface of the CRT display tube 300 together with the elastic force of the window frame 102 itself.
It can be finely adjusted by the elastic force of 6. As a result, for example, the edge 116 of the window frame 102 is deformed or distorted into a state different from the state when the front cabinet 100 is shipped, while the CRT display device is continuously used for a long period of time. The window frame portion 102 due to
Even if a gap is formed between the edge 116 of the CRT display tube and the front surface of the CRT display tube 300, the gap can be mechanically (forced) reliably closed by the elastic force of the pressing plate member 106.

When the pressing plate member 106 is pressed against the lever ribs 104, the pressing plate member holding portions 105a and 105b move the reinforcing ribs 103 from the lever ribs 104 to the rear side of the window frame part 102 together with the window frame part 102. A force (rotational moment about the lower end side of the window frame portion 102) is applied to the reinforcing ribs 103 and the window frame portion 102, and as a reaction force thereof, an elastic stress caused by the deformation of the window frame portion 102 is generated. Hangs from the lever rib 104 to the push plate member 106 via the reinforcing rib 103, so that the reaction force is received and the push plate member 106 is kept pressed against the lever rib 104.

The push plate member holding portions 105a, 105b
Is between the upper surface of the lever rib 104 against which the pressing plate member 106 is pressed and the lower surface of the pressing plate member holding portions 105a and 105b holding the pressing plate member 106.
When 6 is inserted, the relative positional relationship with the lever rib 104 is set so that the lever rib 104 exerts an appropriate amount of force that pushes down to the bottom surface 110 side as described above. ing.

The push plate member holding portions 105a, 10
As shown in FIG. 3 or FIG. 12, 5b is attached to the back surface of the window frame portion 102 at the bottom (when the window frame portion 102 is made of plastic, the window frame portion 102 is It may be formed integrally with the back surface), or, as shown in FIG. 13, it is mounted on the back surface of the bottom surface 110 which is bent and continuous from the window frame portion 102 on the bottom side of the front cabinet 100. (When the bottom surface 110 of the window frame portion 102 is made of plastics, it may be integrally molded with the back surface of the bottom surface 110 of the window frame portion 102).

However, as schematically shown in FIG. 14, the reaction force T2 (moment of) applied to the push plate member 106 by the elastic force of the window frame portion 102 is the push plate member holding portion 1.
05a, 105b, and its reaction force T2 is the pressing force T1 by the pressing plate member 106.
Considering that (moment of) is due to the function of elastically bending the window frame portion 102 by pushing down the lever rib 104, the force T1 by which the push plate member 106 pushes down the lever rib 104. And push plate member holding portion 10
In order to more reliably prevent the reaction forces T2 received by 5a and 105b from canceling each other, the push plate member holding portion 105
As shown in FIG. 13, it is desirable that a and 105b be mounted on the back surface of the bottom surface 110 of the front cabinet 100.

By doing so, as schematically shown in FIG. 15, the push plate member holding portions 105a, 105b are provided.
Since the reaction force T2 received by is substantially not applied to the window frame portion 102, the force T1 that pushes down on the upper surface of the lever rib 104 by inserting the pressing plate member 106 applies the rotational moment due to the force T1. Thus, the window frame portion 102 can be effectively deformed to the rear surface side thereof, and the gap between the window frame portion 102 and the front surface of the CRT display tube 300 can be eliminated. However, when the front cabinet 100 is injection-molded using a material such as plastics, the split mold structure of the injection-molding die may be complicated, which is a trade-off. In consideration of the above, it is desirable to appropriately determine on which side the push plate member holding portions 105a and 105b should be provided.

Locking claws 108 are provided at the ends of the push plate member holding portions 105a and 105b in order to prevent the push plate member 106 from falling off after being inserted as described above. The locking claw 108 locks the rear edge of the push plate member 106 so that the push plate member 106 does not move in the direction away from the back surface of the window frame portion 102.

Incidentally, the locking claw 108 and the push plate member 1
As a variation of 06, in addition to the one shown in FIG. 3, for example, as shown in FIG.
When the through hole 109 into which the locking claw 108 is fitted is provided in the center of the short side direction of 06, and the pressing plate member 106 is held by the pressing plate member holding portions 105a and 105b, the pressing plate member is held. The locking claw 108 may be set to be fitted in the through hole 109 of 106.

The rear cabinet 200 is attached to the rear of the front cabinet 100 and is mounted on the CRT display tube 3.
The second half of 00 (in other words, almost the entire rear panel) is accommodated, and this may have a general structure and appearance.

Next, C according to one embodiment of the present invention
The main operation of the RT display device will be described. FIG. 17 shows the main operation.

In the front cabinet 100, the surface of the lever rib 104 against which the pressing plate member 106 is pressed and the pressing plate member 1 in the pressing plate member holding portions 105a and 105b.
When the pressing plate member 106 is inserted between the pressing plate member 106 and the surface holding the 06, the force applied from the pressing plate member 106 to the lever rib 104 is transmitted from the lever rib 104 to the reinforcing rib 103 connected to the lever rib 104. It

Since the lever ribs 104 and the reinforcing ribs 103 are formed into a substantially L-shape as described above, the lever ribs 104 are pushed by the push plate member 106 at this time to the bottom surface 110 side of the front cabinet 100 ( The force of pushing down (toward the lower side) is a rotational moment that causes the window frame portion 102 to rotate toward the back surface side of the window frame portion 102 with the virtual lower end of the window frame portion 102 at the bottom as the virtual center axis.

Due to the rotation moment, the reinforcing rib 1
The bottom window frame portion 102 is deformed together with 03, and the edge 116 of the window frame portion 102 (in other words, one side on the lower end side of the opening window portion 101) is applied to the front surface of the CRT display tube 300. As a result, in the state where the push plate member 106 is not inserted, as shown in FIG. 18, even if there is a gap between the edge 116 of the window frame portion 102 and the front surface of the CRT display tube 300, the push plate member 106 is not formed. After the insertion of the CRT display tube 300, the gap between the front surface of the CRT display tube 300 and the edge 116 of the window frame portion 102 on the bottom side is closed, and one side of the lower end side of the opening window portion 101 of the CRT display tube 300 is closed. It can be in a state of being along the front without any gaps.

Here, the lever rib 104 is preferably provided at a position close to the bottom surface 110 which is bent and connected from the lower end of the front cabinet 100 in order to more effectively function its function. Bottom 11
When the lever rib 104 is provided at a position close to 0, the movement of the lever rib 104 causes the bottom surface 11 of the front cabinet 100 to move.
To avoid being hindered by 0 or lever rib 1
In order to prevent the bottom surface 110 around the bottom surface 110 from being bent or distorted by the movement of 04,
It is desirable that the bottom surface 110 and the lever rib 104 are separated by a hole 122 as shown in FIG. Alternatively, as shown in FIG. 12 or 13, they may be separated by slit-like notches 123. Further, by forming this portion into the hole 122 and pulling it out to one side, the lever rib 104 or the split plate of the mold (or the manufacturing die at the time of manufacturing) when the pressing plate member holding portions 105a and 105b are injection-molded. It is also possible to obtain a secondary advantage that it is possible to simplify the die cutting).

Alternatively, although not shown, its bottom surface 1
The portion between the lever 10 and the lever rib 104 may be thinned so that the lever rib 104 can move substantially without inconvenience without deforming the bottom surface 110 of the other portions.

Further, the CRT display device is generally mounted on a board bracket 306 for mechanically holding a wiring board 305 having a circuit system for displaying an image on the CRT display tube 300 or inside the CRT display device. It includes a chassis (not shown) on which the components to be stored are mounted. Therefore, as shown in FIG. 19 in the board bracket 306 or the chassis, as described above with reference to FIG.
By attaching or integrally forming 6, it is possible to omit the addition of another component such as the pressing plate member 106 in the form of a sheet metal piece. In this case, the board bracket 3
No. 06 or chassis has tap screws 3 on the bottom surface 110 of the front cabinet 100 as shown in FIG.
07 or screw (not shown) and nut (not shown)
Since it is generally fixedly fixed by such a screwing means, the screwing means may be substantially used as the pressing plate member holding portions 105a and 105b. Alternatively, the screwing means is used as substantially corresponding to the locking claw 108 described above, and the board bracket 306 or the pressing plate member 106 in the chassis is provided by the pressing plate member holding portions 105a and 105b as described above. You may make it support the vicinity of the provided part separately from the screwing means like the tap screw 307.

Further, the lever rib 104, the push plate member holding portions 105a and 105b, and the push plate member 106 are not only in the center of the window frame portion 102 at the bottom side as described above, but also on the left and right sides of the center thereof. They are additionally provided on both sides, and the total is 3
The window frame portion 102 may be forcibly deformed at some place to close the gap.

Further, the lever ribs 104, the push plate member holding portions 105a and 105b, and the push plate member 106, in addition to the window frame portion 102 at the bottom side, are small among the other three sides such as the top side and the left and right sides. It goes without saying that either one or all of them may be further provided.

As described above, according to the CRT display device according to the embodiment of the present invention, the opening window portion of the front cabinet can be formed without hindering downsizing of the front cabinet, simplification of the structure, cost reduction and the like. It is possible to reliably prevent a gap from being generated between the peripheral edge and the image display surface of the CRT display tube.

[0064]

As described above, the first to seventh aspects are as follows.
According to the CRT display device of any one of claims 1 to 8 or the front cabinet for a CRT display device of any one of claims 8 to 14, a surface of the lever rib against which the pressing plate member is pressed and a pressing plate member holding portion. When the pressing plate member is inserted between the plate member holding surface and the surface, the force applied from the pressing plate member to the lever rib is transmitted from the lever rib to the reinforcing rib, and at this time, the lever rib and the reinforcing rib. Has a shape that is substantially L-shaped, and the force with which the lever rib is pushed down by the push plate member toward the bottom side of the front cabinet is the window frame with the lower end of the window frame at the bottom as the central axis. The rotation moment that causes the portion to rotate to the front of the CRT display tube is generated, and the rotation moment deforms the bottom side of the window frame together with the reinforcing ribs to the back side to open the bottom side of the window frame. By pressing (pressing) the edge on the side of the window against the front surface of the CRT display tube, the gap between the front surface of the CRT display tube and the opening on the bottom side of the window frame is closed. So, the miniaturization of the front cabinet,
With an extremely simple structure that does not hinder simplification of structure and cost reduction, it is possible to reliably prevent a gap from being formed between the peripheral edge of the opening window of the front cabinet and the image display surface of the CRT display tube. You can

Particularly, according to the CRT display device according to the second aspect or the front cabinet for the CRT display device according to the ninth aspect, when the lever rib is provided at a position close to the bottom face, the bottom face and the lever rib are: Since it is separated by a notch or a hole, the movement of the lever rib is hindered by the bottom surface of the front cabinet, or the bottom surface around it is curved or distorted downward due to the movement of the lever rib. This can be avoided more reliably.

In particular, according to the CRT display device of the third aspect or the front cabinet for the CRT display device of the tenth aspect, the surface of the lever rib against which the push plate member is pressed is in the insertion direction of the push plate member. Since the lever rib is formed in a tapered shape or a wedge shape so as to form an inclined surface, a surface of the lever rib against which the pressing plate member is pressed and a surface of the pressing plate member holding portion that holds the pressing plate member are provided. It becomes possible to insert the push plate member more smoothly during this period.

According to the CRT display device of the fourth aspect or the front cabinet for the CRT display device of the eleventh aspect, the push plate member holding portion is provided with a locking claw for preventing the push plate member. Therefore, it is possible to more reliably prevent the push plate member from coming off after being inserted.

In particular, according to the CRT display device of the fifth aspect or the front cabinet for the CRT display device of the twelfth aspect, a wiring board having a circuit system for displaying an image on the CRT display tube is provided. Since the above-mentioned push plate member is attached to or integrally formed with the chassis to which the substrate bracket for mechanically holding or the part to be housed inside the CRT display device is attached, it is possible to use a push plate member of a different stage. It is possible to omit additional parts, and it is possible to avoid an increase in the number of parts and an increase in manufacturing costs and parts costs associated therewith.

According to the CRT display device according to claim 6 or the front cabinet for CRT display device according to claim 13, the lever rib, the pressing plate member holding portion and the pressing plate member are provided on the bottom side as described above. In addition to the center of the window frame, it is further provided on at least one or both of the left and right sides of the center.
The gap between the front surface of the display tube and the edge of the window frame portion on the side of the opening window can be more surely closed over the entire width in the longitudinal direction.

According to the CRT display device according to claim 7 or the front cabinet for CRT display device according to claim 14, the lever rib, the push plate member holding portion and the push plate member are provided on the bottom side of the window frame portion. Besides, on at least one of the other three sides such as the top side and both sides,
Since it is further provided, in addition to the bottom of the window frame,
It is possible to more surely eliminate (close) the gaps on the edges such as the upper side and the left and right sides.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a CRT display device according to an embodiment of the present invention.

FIG. 2 is a view of a front cabinet of the CRT display device shown in FIG. 1 viewed from the back side.

FIG. 3 is a diagram in which a window frame portion on the bottom side provided with a reinforcing rib, a lever rib, and a pressing plate member holding portion is particularly extracted and shown.

FIG. 4 is a diagram showing an example of variations in the shape of reinforcing ribs.

FIG. 5 is a diagram showing a relationship between a slope of a lever rib and an insertion state of a push plate member.

FIG. 6 is a diagram showing an example of variations in the shape of a lever rib.

FIG. 7 is a diagram showing an example of a configuration in which an auxiliary lever rib is omitted.

FIG. 8 is a diagram showing an example of a case where the lever ribs are formed so wide as to include the auxiliary lever ribs, and the reinforcing ribs are also formed correspondingly.

FIG. 9 is a diagram showing a positional relationship among a lever rib, a push plate member holding portion, and a push plate member.

FIG. 10 is a diagram showing one variation of the positional relationship among the lever rib, the push plate member holding portion, and the push plate member.

FIG. 11 is a diagram showing one variation different from that shown in FIG. 10 in the positional relationship between the lever rib, the push plate member holding portion, and the push plate member.

FIG. 12 is a diagram showing an example of a mode of installation positions of a push plate member holding portion.

FIG. 13 is a diagram showing an example of a mode different from that shown in FIG. 12 of the installation position of the push plate member holding portion.

FIG. 14 is a diagram schematically showing a state in which the force of the push plate member pushing down the lever rib and the reaction force received by the push plate member holding portion cancel each other out.

FIG. 15 is a diagram schematically showing how the pressing plate member applies a force to push down the lever rib when the pressing plate member holding portion is provided on the bottom surface.

FIG. 16 is a diagram showing an example of a variation of the locking structure between the locking claw and the pressing plate member.

FIG. 17 is a diagram showing main actions in a CRT display device according to an embodiment of the present invention.

FIG. 18 is a diagram showing an example of a state in which a pressing plate member is not mounted and a gap is generated in the CRT display device according to the embodiment of the present invention.

FIG. 19 is a diagram showing an example of a case where a push plate member is attached to or integrally formed with a board bracket or a chassis.

FIG. 20 is a diagram showing a state where a board bracket or a chassis to which a push plate member is attached or integrally formed is screwed to a front cabinet.

FIG. 21 is a diagram schematically showing a state in which a warp-direction distortion is generated in the central portion in the longitudinal direction of the bottom side of the front cabinet in the conventional CRT display device.

FIG. 22 is a diagram schematically showing a state in which distortion in the inward direction is generated in the central portion in the longitudinal direction of the bottom side of the front cabinet in the conventional CRT display device.

FIG. 23 is a diagram showing an example of a conventional technique in which a sheet metal is lined on a bottom side of a front cabinet in a conventional CRT display device in order to prevent the generation of a distortion or a gap.

[Explanation of symbols]

100 ... Front cabinet, 101 ... Open window part, 1
02 ... Window frame part, 103 ... Reinforcing rib, 104 ... Lever rib,
105a, 105b ... Push plate member holding portion, 106 ... Push plate member, 107a, 107b ... Auxiliary lever rib, 200 ... Rear cabinet, 300 ... CRT display tube

Claims (14)

[Claims] 1. A CRT display tube for displaying an image on the front surface,
A front cabinet that is attached to the front surface of the CRT display tube, has an opening window portion that exposes the image display area of the CRT display tube to the front side, and has a window frame portion that surrounds the opening window portion; A CRT display device having a rear cabinet that is attached to the rear of the front cabinet and accommodates the CRT display tube, wherein the front cabinet has a window substantially at the center of the four sides of the window frame. Reinforcing ribs provided so as to reinforce the flexural rigidity in a direction orthogonal to the longitudinal direction of the frame portion, and a substantially L-shaped connection with the reinforcing ribs, which protrudes toward the rear surface side of the window frame portion. And a pressing plate that applies a force that is pressed against the lever rib and that deforms the reinforcing rib to the back surface side of the window frame portion to the lever rib. A member and a push plate member holding portion for receiving a reaction force applied from the lever rib to the push plate member and holding a state in which the push plate member is pressed against the lever rib. The lever rib and the lever rib so that the pressing plate member is interposed between a surface of the lever rib that is pressed against the pressing plate member and a surface of the pressing plate member holding portion that holds the pressing plate member. A positional relationship with the pressing plate member holding portion is set, and by inserting the pressing plate member into the lever rib, the force applied to the lever rib is transmitted to the reinforcing rib. It is set such that the bottom side of the window frame part is deformed to the back side together with the reinforcing ribs, and the edge of the bottom side of the window frame part on the side of the open window part is applied to the front side of the CRT display tube. A CRT display device characterized by the above. 2. A bottom side of the window frame portion is bent and connected to a bottom surface of the front cabinet, and the bottom surface and the lever rib are separated by a notch or a hole. Item 2. A CRT display device according to item 1. 3. The lever rib is formed in a tapered shape or a wedge shape so that a surface of the lever rib against which the pressing plate member is pressed is a surface inclined with respect to an insertion direction of the pressing plate member. C according to claim 1, characterized in that
RT display device. 4. The CRT display device according to claim 1, wherein the push plate member holding portion includes a locking claw for preventing the push plate member from falling off. 5. A board bracket for mechanically holding a wiring board having a circuit system for displaying an image on the CRT display tube or a component housed inside the CRT display device is mounted. It has a chassis,
The push plate member is attached to or integrally formed with the substrate bracket or chassis.
The described CRT display device. 6. The lever rib, the push plate member holding portion, and the push plate member are further provided on at least one or both of both sides thereof in addition to the substantially center. The CRT display device according to claim 1, which is characterized in that. 7. The lever rib, the push plate member holding portion, and the push plate member are further provided on at least one of the other three sides in addition to the bottom side. The CRT display device according to claim 1. 8. A window frame which is attached to the front surface of a CRT display tube for displaying an image and which is provided with an opening window portion for exposing the image display area of the CRT display tube to the front side and surrounds the opening window portion. A front cabinet for a CRT display device having a portion, wherein a bending rigidity in a direction orthogonal to a longitudinal direction of the window frame portion is reinforced at approximately the center of the bottom of the four sides of the window frame portion. A reinforcing rib provided on the lever rib, a lever rib formed in a shape that is substantially L-shaped in relation to the reinforcing rib and protruding toward the rear surface side of the window frame portion, and pressed against the lever rib, A pressing plate member that applies a force that deforms the reinforcing ribs to the back surface side of the window frame portion to the lever ribs, and a reaction force that is applied from the lever ribs to the pressing plate member is received, and the pressing plate is received. Push the member against the lever rib. And a surface of the lever rib against which the pressing plate member is pressed and a surface of the pressing plate member holding portion that holds the pressing plate member. So that the push plate member is inserted, the positional relationship between the lever rib and the push plate member holding portion is set, with respect to the lever rib by pressing the push plate member to the lever rib. The force applied to the reinforcing ribs is transmitted to the reinforcing ribs so that the bottom side of the window frame portion is deformed to the back side, and the edge of the bottom side of the window frame portion on the side of the opening window portion is changed to the CRT display tube. A front cabinet for a CRT display device, which is set so as to be applied to the front surface of the. 9. The bottom side of the window frame portion is bent and connected to the bottom surface of the front cabinet, and the bottom surface and the lever rib are separated by a notch or a hole. Item 8. A front cabinet for a CRT display device according to item 8. 10. The lever rib is formed in a tapered shape or a wedge shape so that a surface of the lever rib against which the pressing plate member is pressed is a surface inclined with respect to an inserting direction of the pressing plate member. The front cabinet for a CRT display device according to claim 8, wherein the front cabinet is a CRT display device. 11. The front cabinet for a CRT display device according to claim 8, wherein the push plate member holding portion includes a locking claw for preventing the push plate member from falling off. 12. A board bracket for mechanically holding a wiring board having a circuit system for displaying an image on the CRT display tube or a component housed inside the CRT display device is mounted. 9. The front cabinet for a CRT display device according to claim 8, further comprising a chassis, wherein the push plate member is attached to or integrally formed with the substrate bracket or the chassis. 13. The lever rib, the push plate member holding portion, and the push plate member are further provided on at least one or both of both sides thereof in addition to the substantially center. The front cabinet for a CRT display device according to claim 8. 14. The lever rib, the push plate member holding portion, and the push plate member are further provided on at least one of the other three sides in addition to the bottom side. The front cabinet for a CRT display device according to claim 8.