JPH11260436A - Display device - Google Patents

Abstract

(57) [Problem] To improve the efficiency of assembling work by reducing the number of parts by reducing the number of parts by not only easily attaching a grounding mechanism but also easily attaching a ground wire to the grounding mechanism. To provide a display device capable of performing such operations. A display device (1) for projecting and displaying an image, comprising: projection means (30) for projecting an image; and a ground wire (18) for grounding the projection means (30) to a predetermined destination. A grounding wire 18 is connected to the grounding mechanism 2 for contacting the surface of the projection means 30 with an elastic force to ground, and a grounding mechanism 2 for fixing the projection means 30 by the elasticity and for fixing the projection means 30. Is arranged in the vicinity of the projection means 18 and the grounding mechanism 2
And fixing means 8a for abutting against the surface of.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device having a grounding mechanism for grounding a cathode ray tube.

[0002]

2. Description of the Related Art Some display devices for displaying images on a large screen include a projection CRT (Cathod).
e-Ray Tube). A projection CRT (hereinafter, abbreviated as a display device) is a cabinet that constitutes an exterior member, a chassis that is disposed inside the cabinet, and that partially has a fixing portion as a fixing destination for fixing a cathode ray tube described later. , A screen provided on the front surface of the cabinet, a cathode ray tube for displaying an image on the screen, and fixing means for fixing the cathode ray tube to the fixing portion.

[0003] As a fixing means for fixing the cathode ray tube to the fixing portion, there are a method using a leaf spring and a method using a holder. FIG. 11 is a plan view showing the vicinity of the cathode ray tube when the cathode ray tube is fixed to the fixing portion using a leaf spring as the fixing means, as viewed from the rear side of the display device.

The cathode ray tube 130 is a leaf spring 1 having elasticity.
08a and 108b
Is fixed by screws. Cathode ray tube 1
In 30, when grounding is provided between the exterior carbon 116 forming the exterior of the cathode ray tube 130 and a chassis (not shown), the grounding is performed as follows. Cathode ray tube 1
As shown in FIG. 11, the Henso wire 124 is routed so as to be in contact with the surface of the 30 exterior carbon 131.

The end line 124 has a leaf spring 108 at one end.
In the vicinity of b, it is fixed by a set screw 109b while being tensioned by a spring 122, and the other end is fixed by a screw together with the ground wire 118 by a set screw 109a. The ground wire 118 is connected to the chassis to ground the cathode ray tube 130.

FIG. 12 is a plan view showing the vicinity of the cathode ray tube when the cathode ray tube is fixed to a fixing portion using a holder as a fixing means, as viewed from the rear side of the display device.
The cathode ray tube 130 is fixed to the fixing portion 131 so as to surround the holder 108. In the cathode ray tube 130, when grounding is provided between the exterior carbon 116 forming the exterior of the cathode ray tube 130 and the chassis, the grounding is performed as follows. An earth spring 102 provided to take the ground from the cathode ray tube 130 is provided above the cathode ray tube 130. One end of the ground spring 102
As shown in FIG. 13, it is in contact with the surface of the cathode ray tube 130.
The earth spring 102 is fixed to a mounting portion 131a provided on a part of the fixing portion 131 of the cathode ray tube 130 by a set screw 109c separately from a fixing screw of the holder 108 for fixing the cathode ray tube 130. This set screw 10
9c also screws the ground wire 118 at the same time, and the ground wire 118 can ground the cathode ray tube 130 to the chassis.

[0007]

However, in order to ground the cathode ray tube 130 as shown in FIG.
The method of routing 4 requires a predetermined spring 122, a fixing screw 109a, and the like, and a place (shape) of a fixing portion for fixing the fixing screw, in order to keep the tension of the wire 124 constant. For this reason, manufacturing costs of parts are required to manufacture the display device, and the efficiency of the assembly process of the display device is low.

Further, in order to ground the cathode ray tube 130 as shown in FIG.
In the method of attaching 2, the shape of the holder 108 must be large. Also, with this method,
Since the mounting portion 131a dedicated to the ground spring 112 must be provided, the shape of the holder 108 becomes complicated. For this reason,
The manufacturing cost of the holder 108 is increased. Further, there is a problem that in the manufacturing process of the projection CRT, the assembling process of screwing the ground wire 118 to the ground spring 112 takes time and effort.

Therefore, the present invention solves the above-mentioned problems, and not only can the earth mechanism be easily attached, but also the earth wire can be easily attached to the earth mechanism. It is an object of the present invention to provide a display device capable of improving efficiency.

[0010]

According to the present invention, there is provided a display device for projecting and displaying an image, the display device comprising: a projection device for projecting an image; A ground wire for grounding to a given end, and a ground wire are connected, and a grounding mechanism for contacting the surface of the projection means with an elastic force for grounding, and fixing and projecting the projection means with the elastic force. The present invention is attained by a display device characterized in that a grounding mechanism is provided near a projection means when the means is fixed, and the grounding mechanism has fixing means for abutting against a surface of the projection means.

According to the present invention, in the display device, the grounding mechanism for grounding the cathode ray tube is previously attached to the fixing means for fixing the cathode ray tube. The grounding mechanism can be attached only by fixing the inside of the device by the fixing means.

[0012]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Although the embodiments described below are preferred specific examples of the present invention, various technically preferable limitations are given. However, the scope of the present invention is not limited to the following description. It is not limited to these forms unless otherwise stated.

FIG. 1 is a sectional view showing a display device as a preferred embodiment of the present invention. The display device 1 is a so-called rear-projection type (projection type) display device 1 that projects projection light 16 of an image on the back surface 12b of the screen 12. The display device 1 generally includes a cabinet 20, a screen 12, a cathode ray tube 30 (projection unit), a signal forming unit 22, and the like.

The cabinet 20 is a case member of the display device 1. The screen 12 is a cabinet 2
0 is a display screen provided on the front surface 20a of the “0”. The screen 12 has a cathode ray tube 3 controlled by the signal forming unit 22.
The image is displayed by projecting the projection light 17 constituting the image on the back surface 12b of the screen 12, which is the light projected by 0.

The cathode ray tube 30 is attached to the fixed part 14 as a part of a chassis inside the cabinet 20. The cathode ray tube 30 is, for example, red (R), green (R)
And blue (B) color images can be formed on the screen 12. In addition, depending on the type of the cathode ray tube 30,
There is also a type in which each color described above is projected by three different cathode ray tubes. In this type, each projection light 17 from each cathode ray tube is superimposed on the screen 12 to form a color image.

FIG. 2 is an enlarged plan view showing the configuration near the cathode ray tube 30 in FIG. FIG. 3 is a plan view when the cathode ray tube 30 of FIG. 2 is viewed from the G direction. The cathode ray tube 30 includes a fixing unit 14, leaf springs 8a and 8b (fixing means), an earth spring 2 (earth mechanism), a cooling mechanism unit 4, and a projection lens 6.
And a lens fixing plate 7 and the like.

As shown in FIG. 2, the fixed portion 14 is made up of, for example, leaf springs 8a and 8b having a plate spring-like elasticity.
Is a member to be fixed when fixing. Leaf spring 8a
Is a substantially planar member having claws on both sides as shown in FIG. The leaf springs 8a and 8b are attached to the fixed part 14 so as to surround the cathode ray tube 30 as shown in FIG. Since the leaf springs 8a and 8b have elasticity, the cathode ray tube 30 can be firmly fixed to the fixing portion 14. The leaf spring 8b has substantially the same shape except that the ground spring 2 is not provided. When the cathode ray tube 30 is attached to the fixing portion 14, the leaf spring 8a also attaches the ground spring 2 at the same time as described below.

The ground spring 2 is a ground mechanism for grounding the cathode ray tube 30. The ground spring 2 is attached to the fixing portion 14 simultaneously with the leaf spring 8a as shown in FIG. Therefore, when the leaf spring 8a is attached to the fixing portion 14, the earth spring 2 is automatically arranged near the cathode ray tube 30. The ground spring 2 is a part thereof (the contact portion 2 in FIG. 2).
b) comes into contact with the cathode ray tube 30. The ground spring 2 is L-shaped as shown in FIG. 5B, for example, and is a leaf spring-like elastic metal plate having two plane portions perpendicular to each other as shown in FIG. 5A. As a material of the earth spring 2, for example, copper having conductivity can be adopted.

A hole 2a is provided in one plane of the ground spring 2 as shown in FIG. This hole 2a is a hole for passing the fixing screw 9 when fixing the leaf spring 8a to the fixing portion 14 as shown in FIG. Since the ground spring 2 is attached to the fixed part 14 at the same time as the leaf spring 8a, the ground spring 2 can be attached to the cathode ray tube 30 when the leaf spring 8a is attached to the fixed part 14.

As shown in FIG. 5B, an abutment portion 2b is formed on a substantially flat surface of the earth spring 2 where the hole 2a is not provided, as shown in FIG. Contact part 2b
Is a portion that comes into contact with the exterior carbon 16 of the cathode ray tube 30 in FIG. 4 when the leaf spring 8a is attached to the fixed portion 14 together with the earth spring 2. The contact portion 2b is formed, for example, into a plurality of claws as shown in FIG.

For example, a connection portion 2b for attaching a ground wire is formed on the plane of the ground spring 2 where the hole 2a is formed, as shown in FIG. The ground wire 18 provided with a predetermined connector 18a as shown in FIG. 4 is connected to the connection portion 2b. The other end of the ground wire 18 is connected to, for example, a predetermined ground destination (for example, a chassis or the like) of the display device 1 so that the cathode ray tube 30 is grounded. The connection portion 2b has electrical contacts that fit with the connector 18a. Connection part 2b and connector 18a
For example, those having a configuration such as a conventional outlet for a power supply and an outlet plug as shown in FIG. In this description, for example, the connector 18a of the ground wire 18 to be connected is a female side, and the connecting portion 2b of the ground spring 2 to be connected is a male side, which is different from the conventional outlet plug. . Since the connection portion 2b and the connector 18a have the above configurations, the ground wire 18 can be easily attached to the ground spring 2 with one touch when the display device 1 is assembled. In the display device 1 configured with the above components, special components and the like are not required for assembling, and assembling efficiency can be improved by reducing the number of components. Further, since the number of components is reduced, the cost of the display device 1 can be reduced.

The cooling mechanism 4 is provided between the projection lens 6 and the cathode ray tube 30 as shown in FIG. The cooling mechanism 4 is for cooling the cathode ray tube 30. The cooling mechanism 4 has a cooling liquid 5 for cooling therein.
The projection lens 6 is attached to the cathode ray tube 30 by the lens fixing plate 7 as shown in FIG. 2, and is used to project the projection light 17 projected from the cathode ray tube 30 to the back surface 12b of the screen 12 as shown in FIG. Lens.

A display device according to a preferred embodiment of the present invention has the above-described configuration. Next, a brief description will be given of a method of assembling the display device. 8 to 10 are plan views showing how the grounding mechanism of the cathode ray tube 30 is assembled. The cathode ray tube 30 is arranged such that the image display surface is in close contact with the cooling mechanism 4 as shown in FIG.
Next, as shown in FIG. 9, the contact portion 2b of the ground spring 2 is brought into contact with the surface of the cathode ray tube 30 by pressing the ground spring 2 mounted simultaneously with the leaf spring 8a in the X direction as shown in FIG. The contact portion 2b of the ground spring 2 slides while contacting the outer carbon 16 of the cathode ray tube 30 as shown in FIG.
The vicinity of b is deformed in the R direction. Therefore, the contact portion 2b is
Due to the stress deformed in the direction, it comes into firm contact with the surface of the cathode ray tube 30. At this time, since the contact surface of the contact portion 2b of the ground spring 2 with the cathode ray tube 30 is a curved surface, it is possible to prevent the contact portion 2b from scratching the surface of the cathode ray tube 30. Further, in the display device 1, the cathode ray tube 3
By connecting the connector 18a of the ground wire 18 in the Y direction as shown in FIG. 7 (A) to the connecting portion 2b of the ground spring 2 abutting on the cathode spring 2 as shown in FIG. 30 is grounded.

According to the embodiment of the present invention, since the earth spring 2 is mounted simultaneously with the leaf spring 8a, the earth spring 2 abuts on the cathode ray tube 30 only by fixing the cathode ray tube 30 using the leaf spring 8a. Can be done. On this occasion,
Since the fixing screw 9 of the leaf spring 8a also fixes the earth spring 2, it is possible to reduce the number of components, such as the dedicated mounting portion 131a of the earth spring 2 and the spring 122, which are required in the related art. Therefore, cost can be reduced. In addition, since the ground spring 2 and the ground wire 18 that are in contact with the cathode ray tube 30 are provided with the connecting portion 2a and the connector 18a for connecting the ground spring 2 and the ground wire 18, the ground wire 18 can be easily connected to the ground spring 2 with one touch. it can. From the above, the working efficiency when assembling the display device 1 can be improved.

The present invention is not limited to the above embodiment. Such a grounding mechanism can be applied not only to a display device but also to other devices that require grounding.

[0026]

As described above, according to the present invention, not only the grounding mechanism can be easily mounted, but also the ground wire can be easily mounted on the grounding mechanism. Lowering and improving the efficiency of assembly work.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a display device as a preferred embodiment of the present invention.

FIG. 2 is an enlarged plan view showing a detailed configuration near a cathode ray tube in FIG. 1;

FIG. 3 is a plan view showing a state when the vicinity of the cathode ray tube in FIG. 2 is viewed from a G direction.

FIG. 4 is a plan view showing a state in which the grounding mechanism is in contact with the exterior carbon of the cathode ray tube in the cathode ray tube of FIG. 3;

FIG. 5 is an enlarged plan view showing details of the ground spring shown in FIG. 2;

FIG. 6 is a perspective view showing a state in which the earth spring of FIG. 2 is attached to a leaf spring.

FIG. 7 is a perspective view showing a state where a ground wire is connected to the ground spring of FIG. 2;

FIG. 8 shows a leaf spring to which the earth spring of FIG. 2 is attached;
FIG. 3 is a plan view showing a state in which the cathode ray tube is fixed.

FIG. 9 shows a leaf spring to which the earth spring of FIG. 2 is attached;
FIG. 3 is a plan view showing a state in which the cathode ray tube is fixed.

FIG. 10 is a plan view showing a state in which the leaf spring to which the earth spring of FIG. 2 is attached fixes the cathode ray tube.

FIG. 11 is a plan view showing a state where the cathode ray tube is fixed to a chassis using a leaf spring as a fixing means in the conventional display device, as viewed from the rear of the cathode ray.

FIG. 12 is a plan view showing a state in which a cathode ray tube is fixed to a chassis using a holder as a fixing means and viewed from the rear of the cathode ray in the conventional display device.

13 is a plan view showing a state in which the display device of FIG. 12 is viewed from an H direction.

14 is a cross-sectional view of the display device of FIG. 12 when a part is cut.

DESCRIPTION OF SYMBOLS 1 ... Display device, 2 ... Earth spring (earth mechanism), 2c ... Connection part, 8a, 8b ... Leaf spring (fixing means), 18 ... Earth wire, 30 ... Cathode ray tubes (projection means)

Claims (4)

[Claims] 1. A display device for projecting and displaying an image, comprising: projection means for projecting the image; a ground wire for grounding the projection means to a predetermined destination; and a ground wire. A grounding mechanism connected to the surface of the projection means by elastic force for grounding, and a grounding mechanism for fixing the projection means by elasticity and disposing the grounding mechanism near the projection means when the projection means is fixed. A display device, characterized in that the ground mechanism has fixing means for abutting on the surface of the projection means. A first connection portion provided at a tip of the ground wire for connecting to a grounding mechanism; and a grounding mechanism formed on the grounding mechanism. The display device according to claim 1, further comprising a second connection portion connected to the display device. 3. The display device according to claim 1, wherein the grounding mechanism is a leaf spring-shaped elastic body. 4. The display device according to claim 1, wherein the fixing means is a leaf spring-shaped elastic body.