JP4306374B2 - Plasma display device - Google Patents

Description

  The present invention relates to a plasma display device which is a flat display device using a plasma display panel as a display device.

  In a plasma display device which is a flat display device using a plasma display panel (hereinafter referred to as PDP) as a display device, the surroundings of the PDP are shielded so that unnecessary electromagnetic waves radiated from the PDP do not leak outside the device ( It is necessary to take a so-called EMI (Electromagnetic Interference) countermeasure. Therefore, in general, the plasma display apparatus blocks an electromagnetic wave while transmitting a back cover having conductivity for shielding the back side of the PDP and a video light from the PDP for shielding the front side of the PDP. An optical filter having a conductive layer (for example, a metal mesh layer), and holding and fixing the optical filter, are electrically connected to the conductive layer and the back cover of the optical filter to prevent leakage of electromagnetic waves from the periphery and side surfaces of the optical filter. And a conductive optical filter fixing means for preventing. The normal optical filter is sandwiched between the optical filter fixing bracket and the front frame as disclosed in the following Patent Document 2 and Patent Document 3, and in this case, the optical filter fixing means is the optical filter fixing bracket. And a front frame. Of course, if the optical filter fixing bracket can prevent leakage of electromagnetic waves from the periphery and side surfaces of the optical filter, the front frame body need not have conductivity.

  In other words, the PDP is held in a shield casing surrounded by a conductive back cover, an optical filter, and an optical filter fixing bracket / front frame that is an optical filter fixing means, and does not require electromagnetic waves from the PDP. Radiation is blocked by an optical filter on the front side, an optical filter fixture / front frame on the side, and a back cover on the back.

  And the connection method of the optical filter fixing metal fitting / front frame constituting the shield housing and the back cover is disclosed in, for example, Patent Document 1 and Patent Document 2 below.

  In the following Patent Document 1, a conductive back cover and a conductive front frame are joined by screwing via a conductive gasket (conductive sponge), and the front frame and the conductive back cover are electrically connected. The shield casing that surrounds the PDP is formed. In Patent Document 2 below, an optical filter is sandwiched between a front frame and a metal optical filter fixing bracket via a conductive gasket, and the optical filter fixing bracket is joined to the front frame and the conductive back cover. The optical filter, the optical filter fixing bracket, and the back cover are electrically connected to form the shield casing that covers the PDP.

  In the following Patent Document 3, the optical filter has an optical filter fixing bracket (described as an electrode in the present disclosure) and a front surface in which a large number of strip-shaped leaf springs (comb-shaped leaf springs) are cut in a direction perpendicular to the side. The optical filter fixing bracket is fixed to the front frame with screws.

JP 2001-332886 JP 2001-141972 JP-A-9-171353

  However, in Patent Document 1, a conductive gasket is used for electrical connection between the front frame and the back cover. This conductive gasket is expensive, and if an expensive conductive gasket is used throughout the joint between the front frame and the back cover, there is a problem that the cost of the plasma display device is increased.

  Moreover, in the said patent document 2, since an optical filter fixing metal fitting is pinched | interposed into the junction part of a front frame body and a back cover, and is screwed and joined, there exists a possibility that electrical connection may become inadequate except a screw fastening part. There is a concern that the shielding effect will decrease.

  Moreover, in the said patent document 3, electrical connection with the component of the shield housing | casing which blocks the electromagnetic waves radiated | emitted from the PDP to the back side, and a front frame is not mentioned.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide a plasma display device capable of achieving cost reduction while ensuring shielding characteristics necessary for performance.

In order to achieve the above object, a plasma display device of the present invention comprises a plasma display panel, a conductive back cover that covers the back side of the plasma display panel, and a conductive layer disposed on the front side of the plasma display panel. An optical filter having conductive first holding means for holding the filter and electrically connected to the back cover; holding the optical filter together with the first holding means; and the back cover Conductive second holding means electrically connected to
The first holding means is formed with a protrusion that is in contact with the optical filter, and the second holding means is provided on the first elastic body that is pressed against the optical filter and on the back cover. A second elastic body to be pressed against is formed, and the optical portion is formed by the protrusion formed on the first holding means and the first elastic body formed on the second holding means. and held by sandwiching the filter, the second the second formed in the holding means of the elastic body, and characterized in that it is formed is divided into a plurality of long side direction of the second holding means To do.

Therefore, in the plasma display apparatus of the present invention, among the electromagnetic waves radiated from the plasma display panel ( PDP ) , those radiated in the front direction of the PDP are blocked by the optical filter, and those radiated in the back direction are Blocked by the back cover. Electromagnetic waves leaking from the periphery of the optical filter are blocked by the optical filter fixing means which is the holding means, and those radiated in the side surface direction of the PDP are blocked by the second holding means and the back cover. Since the second holding means presses and contacts the second elastic body (for example, a comb-like leaf spring ) to the joint portion of the back cover, the second holding means is electrically conductive as in the past while enhancing the electromagnetic wave shielding effect. Cost can be reduced compared to the case of using a gasket.

Further, the joint portion of the back cover with the second elastic body is substantially parallel to the front surface direction of the PDP, and the comb-like leaf spring is also substantially parallel to the joint portion of the back cover that is also pressed and abutted. It is approximately parallel to the front direction of the PDP.

As described above, since the joint between the back cover and the second elastic body is substantially parallel to the side surface of the PDP, electromagnetic waves radiated from the PDP in the side surface direction are applied to the second elastic body and the back cover. It is difficult to leak the contact portion, and the electromagnetic shielding effect can be further enhanced.

  Shield characteristics necessary for performance can be secured while reducing costs.

  In order to enhance the electromagnetic wave shielding effect, the plasma display device of the present invention does not use an expensive conductive gasket at the joint between the optical filter fixing means and the back cover, and the optical filter fixing means has a predetermined interval in the long side direction. A comb-like leaf spring, which is a metal elastic body formed by being cut into small pieces in a strip shape, and the comb-like leaf spring is pressed against and abutted with the joint portion with the fixing means of the back cover. It is characterized by that.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In all the drawings, elements having common functions are denoted by the same reference numerals, and the elements that have been described once will not be described repeatedly in order to avoid complexity.

  FIG. 1 is a partial sectional view showing an embodiment of the plasma display device of the present invention, FIG. 2 is a partial perspective view of an optical filter fixing bracket having a comb-like leaf spring used in the present invention, and FIG. 3 is a plasma display of the present embodiment. It is a schematic exploded perspective view of an apparatus.

First, an outline of the configuration of the plasma display device will be described with reference to FIG. In FIG. 3, the PDP 1 is covered with a conductive back cover 13 from the back side. In addition, a rectangular translucent optical filter 11 that is substantially similar to the shape of the PDP 1 is disposed on the front surface of the PDP 1. The optical filter 11 is formed with a conductive layer such as a metal mesh, and has an effect of shielding unnecessary electromagnetic waves radiated from the PDP 1. The optical filter 11 is held between the peripheral portion in the metal frame 3 is a first holding means and the optical filter fixing bracket 7 is a second holding means, is held fixed. A front frame 5 is disposed on the forefront of the plasma display device so as to surround a transmission region of video light from the PDP 1. The PDP 1 is fixed in the plasma display device by a support means (not shown).

  Next, the configuration of a shield casing that shields electromagnetic radiation from the PDP 1 will be described with reference to FIG.

In FIG. 1, the metal frame 3 has a groove-shaped protrusion 3 a that extends along the peripheral edge of the optical filter 11, and the optical filter fixture 7 extends along the peripheral edge of the optical filter 11 on the holding side of the optical filter 11. A plate spring 7a having elasticity is provided. The optical filter 11 is sandwiched and held at the periphery by a groove-shaped protrusion 3 a of the metal frame 3 and a plate spring 7 a that is a first elastic body of the optical filter fixture 7. In this embodiment, the optical filter 11 has a conductive layer 11a having an electromagnetic wave shielding effect on the surface on the viewer side, and the conductive layer 11a is electrically connected to the optical filter fixing bracket 7 via a leaf spring 7a. ing.

  An air filter 22 is disposed between the metal frame 3 and the PDP 1 so that dust or the like does not enter between the PDP 1 and the optical filter 11.

  The front frame body 5 includes a front frame 5a that is a base made of mold, and a metal plate frame support bracket 5b provided at a corner portion of the front frame 5a. The frame support bracket 5b is for suppressing warping and deformation of the front frame 5a and screwing it to the back cover 13.

As shown in FIG. 2, the optical filter fixing bracket 7 includes a leaf spring 7a having elasticity that is held along _one side 71 of the optical filter 11 along _one side 71 bent substantially at a right angle. tip surface 7 ₂ is further bent at a substantially right angle, comb plate spring 9 which is a second elastic body formed is finely divided into strips contain notches at predetermined intervals in the long side direction is formed ing. On the face 7 ₂ has a plurality of screw holes 7b for fixing.

  As shown in FIG. 1, the optical filter fixing bracket 7 configured in this way is sandwiched between the conductive back cover 13 and the frame support bracket 5 b together with the metal frame 3 and fixed with screws 23.

  The side 15 which is the tip of an opening (a rectangle similar to the shape of the PDP 1) covering the PDP 1 of the back cover 13 from the back has an inner surface substantially parallel to the front direction of the PDP 1. Similarly, the comb-shaped leaf spring 9 is bent so as to be substantially parallel to the front surface direction of the PDP 1.

  Therefore, when the optical filter fixing bracket 7 is sandwiched and fixed between the rear cover 13 and the frame support bracket 5b together with the metal frame 3, the comb-shaped plate spring 9 of the optical filter fixing bracket 7 is a side portion of the rear cover. 15 is pressed. Since a plurality of comb-shaped leaf springs 9 are densely arranged along the side direction, the reliability of electrical connection between the optical filter fixing bracket 7 and the back cover 13 is good.

  As described above, the optical filter 11, the metal frame 3, the optical filter fixing bracket 7, and the back cover are electrically connected well, and the shield case that shields electromagnetic waves radiated from the PDP 1 well. It can be a body.

  That is, the unnecessary radiation of the electromagnetic wave from the PDP 1 is the optical filter 11 on the front surface, the leakage of the electromagnetic wave from the peripheral part of the optical filter 11 and the side surface direction of the PDP 1 is the metal frame 3 and the optical filter fixing bracket 7, and the rear cover 13 is the rear surface. Is blocked. Of course, since the back cover 13 also partially covers the side surface of the PDP 1, leakage of electromagnetic waves from the side surface direction of the PDP 1 is also reduced.

  In the present invention, in order to ensure electrical connection between the metal frame 3 and the optical filter fixture 7 and the back cover 13, a comb-like leaf spring having elasticity is used in place of the expensive conductive gasket used conventionally. Since it uses, it can manufacture easily by press work and can reduce cost. Moreover, the shield effect can also obtain the performance equivalent to a conductive gasket.

  Further, in the present invention, the side surface 15 of the back cover and the contact surface of the comb-shaped plate spring 9 of the optical filter fixture 7 are substantially parallel to the front surface direction of the PDP 1. Since this contact surface is substantially orthogonal to the electromagnetic wave radiated from the PDP 1 in the side surface direction, the shielding effect can be further enhanced.

  In the embodiment described above, the conductive layer 11a of the optical filter 11 is provided on the viewer side. However, the conductive layer 11b may be provided on the opposite surface opposite to this, even in this case. The conductive layer 11 b is electrically connected to the metal frame 3 through the groove-shaped protrusion 3 a of the metal frame 3. Since the metal frame 3 is overlapped with the optical filter fixing bracket 7 and fixed between the back cover 13 and the frame support bracket 5b, the metal frame 3 is directly electrically connected to the back cover 13 and the optical filter. Fixing bracket 7 → comb leaf spring 9 → indirectly connected to side 15 of back cover 13 to enhance the shielding effect.

  Therefore, in this embodiment, the metal frame 3 and the optical filter fixing bracket 7 are used to fix the optical filter that holds the optical filter and is electrically connected to the optical filter and electrically / mechanically joined to the back cover. Means ".

  Of course, when a conductive layer is formed on the PDP side of the optical filter, the metal filter 3 may be provided with a comb-shaped leaf spring without providing the optical filter fixing bracket 7 with a comb-shaped leaf spring. Needless to say.

  Further, when the optical filter is sandwiched between the front frame body and the optical filter fitting as in Patent Document 2 and Patent Document 3, naturally the front frame body and the optical filter fixing means are also optical filter fixing means. Needless to say.

The fragmentary sectional view showing one example of the plasma display device of the present invention. The fragmentary perspective view of the optical filter fixing metal fitting which has a comb-shaped leaf | plate spring used by this invention. 1 is a schematic exploded perspective view of a plasma display device according to an embodiment. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 PDP, 3 Metal frame, 3a Groove-shaped protrusion, 5 Front frame body, 5a Front frame, 5b Frame support metal fitting, 7 Optical filter fixing metal fitting, 7a Leaf spring, 7b Screw hole, 9 Comb leaf spring, 11 Optical filter, 11a, 11b, conductive layer, 13 back cover, 15 side of back cover, 22 air filter, 23 screw,

Claims (3)

A plasma display panel;
A conductive back cover covering the back side of the plasma display panel;
An optical filter having a conductive layer disposed on the front side of the plasma display panel;
Conductive first holding means that holds the filter and is electrically connected to the back cover;
Conductive second holding means for holding the optical filter together with the first holding means and electrically connected to the back cover;
With
The first holding means is formed with a protrusion that comes into contact with the optical filter, and the second holding means is formed on the first elastic body pressed against the optical filter and on the back cover. A second elastic body to be pressed against is formed;
The optical filter is sandwiched and held by the protrusion formed on the first holding means and the first elastic body formed on the second holding means,
The second the second formed in the holding means of the elastic body, a plasma display apparatus characterized by being formed by being divided into a plurality of long side direction of the second holding means. Plane including the junction between the second elastic member of the rear cover the are parallel outlined in front of the plasma display panel, the second elastic member also the plasma display panel schematically parallel to the front of the The plasma display apparatus according to claim 1, wherein the plasma display apparatus is disposed. 3. The plasma display device according to claim 1, wherein the second elastic body is a comb-shaped leaf spring.

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