JPH1138893A - Grounding structure of optical filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique of surely grounding an optical filter which prevents the unnecessary radiation of electromagnetic waves. SOLUTION: The electrode part 4b of a conductive film 4a of the optical filter 4 disposed on the front surface of the display surface 5b of a PDP(plasma display panel) 5 is grounded. A filter connections 1a at one end of a leaf spring 1 is pressed to this electrode part 4b and a frame connections 1b at the other end is pressed to a grounded frame 7 to ground the conductive film 4a of the optical filter 4. A retaining fitting 2 for holding the filter connections 1a of the leaf spring 1 between this fitting and the electrode part 4b of the optical filter 4 is disposed on the leaf spring 1. The retaining fitting 2 on the leaf spring 1 is screwed to a boss 6a erected on the inner side of the front surface frame 6 of a display device 10 by a screw 3, by which the filter connections 1a of the leaf spring 1 is biased and pressed to the electrode part 4b of the optical filter 4, by which the grounding of the optical filter is ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a grounding structure of an optical filter which is mounted on a front surface of a display surface of a display device to prevent unnecessary radiation and has a reliable grounding.

[0002]

2. Description of the Related Art FIG. 3 is a plan view (A) of a display device showing an example of a grounding structure of a conventional optical filter.
(B) It is an enlarged view of the grounding structure part of an optical filter. An optical filter 4 is mounted on the front surface of the display surface of the PDP 5 serving as a display device of the display device 10 in order to block electromagnetic waves radiated from the PDP 5. In order to prevent unnecessary radiation of electromagnetic waves, the optical filter 4 may be provided with, for example, a conductive film 4a.
And the electrode portion 4b must be grounded. Therefore, the filter portion 31a at one end of the leaf spring 31 is brought into contact with the electrode portion 4b, and the frame connection portion 31b at the other end is brought into contact with the frame 7 made of an aluminum plate or the like connected to the housing ground. The conductive film 4a of the filter 4 is grounded. However, in such a grounding structure, the leaf spring 31
Since the filter connecting portion 31a is not brought into contact with the electrode portion 4b of the optical filter with a sufficient pressure, the impedance of the ground of the optical filter becomes large, and there is a problem that the effect of preventing unnecessary radiation is reduced.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide a technique for reliably grounding an optical filter for preventing unnecessary radiation of electromagnetic waves.

[0004]

A leaf spring having at one end a filter connection portion abutting on an electrode provided on the periphery of the optical filter and at the other end a frame connection portion abutting on a frame connected to the housing ground. By providing a holding member for holding the filter connection portion of the leaf spring between the optical filter and the optical filter, and by pressing the filter connection portion against the electrode of the optical filter by the holding member, the holding member is brought into contact with the electrode. Ensure that the optical filter is grounded.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In a grounding structure of an optical filter for grounding an optical filter having a conductivity for blocking electromagnetic waves radiated from a display surface of a display device such as a PDP (plasma display panel), one end of the structure is provided around the filter. A leaf spring having a filter connection portion abutting on an electrode provided on the portion and a frame connection portion abutting on a frame connected to the housing ground at the other end, and a filter connection portion of the leaf spring being connected to the optical filter. A holding metal fitting is provided to be sandwiched therebetween, and the filter connecting part is urged against the electrode of the optical filter by the holding metal fitting to come into contact with the electrode.

[0006] A protrusion hole is provided on a surface of the holding metal fitting that holds the leaf spring, and the protrusion hole is fitted into a through hole provided in a corresponding portion of the leaf spring, and caulked.
The retainer and the leaf spring are integrated.

[0007] The holding metal and the leaf spring are spot-welded to form an integral structure of the holding metal and the leaf spring.

The leaf spring and the holding member have substantially the same length as one side of the optical filter, and have a comb shape in which a plurality of cuts are provided at a filter connection portion and a frame connection portion of the leaf spring.

The pressing plate has a bent structure bent at a fold parallel to one side of the optical filter.

[0010]

FIG. 1 is a partial plan sectional view of a display device for explaining a grounding structure of an optical filter according to an embodiment of the present invention. FIG. 2 is (A) a front view, (B) a plan view, and (C) a side view of one embodiment of the grounding structure of the optical filter according to the present invention. As in the above-described conventional example, a PDP 5 serving as a display device is provided with a boss 5
a, etc., to form a display device 10
Used for displaying TV images. Display surface 5 of PDP5
An optical filter 4 is provided on the front surface of b to improve display characteristics and prevent unnecessary radiation of electromagnetic waves. In order to prevent unnecessary radiation of electromagnetic waves, it is necessary to form a conductive film 4a on the surface of the optical filter 4 and to ground the electrode portion 4b. For this grounding, the filter connection 1a at one end of the leaf spring 1 is brought into contact with the electrode 4b, and the frame connection 1b at the other end is brought into contact with the frame 7 made of an aluminum plate or the like connected to the housing ground. The contact makes the conductive film 4a of the optical filter 4 ground. On the leaf spring 1, a filter connecting portion 1a of the leaf spring 1 is provided.
Is provided between the optical filter 4 and the electrode portion 4b of the optical filter 4. The holding metal fitting 2 on the leaf spring 1 is screwed into the boss 6 a standing inside the front frame 6 of the display device 10 through the through hole 2 a opened in the holding metal fitting 2 by the screw 3 and the through hole opened in the leaf spring. By stopping, the filter connection portion 1a of the leaf spring 1 is connected to the electrode portion 4b of the optical filter 4.
To ensure that the optical filter is grounded.

The holding member 2 is provided with a protruding hole 2b projecting in the direction of the leaf spring 1, and is fitted into a through hole opened in a corresponding portion of the leaf spring and caulked, so that the holding member and the leaf spring are integrally formed. To facilitate the assembly of the grounding structure.
Alternatively, the holding metal 2 and the leaf spring 1 may be integrally formed by spot welding the holding metal 2 and the leaf spring 1.

The leaf spring 1 and the retainer 2 are a series of ones having substantially the same length as one side of the optical filter 4 to which the leaf spring 1 and the retainer 2 are attached. 1b has a plurality of cuts 1c, 1
By providing c,..., the leaf spring 1 has a comb-like configuration, and the elastic effect of the leaf spring can be increased. The holding plate 2 is bent at a mountain fold portion 2c and a valley fold portion 2d in a direction parallel to one side of the optical filter to which the holding plate is attached, thereby forming a bent structure. To be obtained.

[0013]

As described above, one end is provided with a filter connecting portion which is in contact with an electrode provided on the periphery of the optical filter, and the other end is provided with a frame connecting portion which is in contact with a frame connected to the housing ground. A leaf spring and a holding member for holding the filter connection portion of the leaf spring between the optical filter and the optical filter are provided, and the filter connection portion is urged against the electrode of the optical filter by the holding metal to abut the electrode. This ensures that the leaf spring that grounds the optical filter is connected to the electrode portion, so that the connection impedance can be reduced and a sufficient effect of preventing unnecessary radiation can be obtained.

[Brief description of the drawings]

FIG. 1 is a partial plan sectional view of a display device for explaining a grounding structure of an embodiment of a grounding structure of an optical filter according to the present invention.

FIG. 2 is (A) a front view, (B) a plan view, and (C) a side view of one embodiment of the grounding structure of the optical filter according to the present invention.

3A is a partial plan cross-sectional view of a display device showing an example of a conventional grounding structure of an optical filter, and FIG. 3B is an enlarged view of a grounding structure portion of the optical filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Leaf spring 2 Holder 3 Screw 4 Optical filter 5 PDP (plasma display panel) 6 Front frame 7 Frame 8 Housing 10 Display device 31 Leaf spring

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Claims (5)

[Claims] 1. PDP (Plasma Display Panel)
In a grounding structure of an optical filter for grounding an optical filter having a conductivity that blocks electromagnetic waves radiated from a display surface of a display device, a filter connection portion is provided at one end, which is in contact with an electrode provided in a peripheral portion of the filter. The other end is provided with a leaf spring having a frame connection portion abutting on a frame connected to the housing ground, and a holding member for holding the filter connection portion of the leaf spring between the optical filter and the holding member. A grounding structure for an optical filter, wherein the filter connection portion is urged against an electrode of the optical filter so as to contact the electrode. 2. A pressing hole is provided on a surface of the holding metal that holds the leaf spring, and the pressing hole is inserted into a through hole provided in a corresponding portion of the leaf spring, and caulked. 2. A grounding structure for an optical filter according to claim 1, wherein the holding member and the leaf spring are formed in an integral structure. 3. The grounding structure for an optical filter according to claim 1, wherein the holding metal and the leaf spring are integrally formed by spot welding the holding metal and the leaf spring. 4. The leaf spring and the retainer have substantially the same length as one side of the optical filter to which the leaf spring and the retainer are attached, and a plurality of cuts are made in a filter connection part and a frame connection part of the leaf spring. 2. A grounding structure for an optical filter according to claim 1, wherein said optical filter has a comb shape. 5. The pressing plate according to claim 1, wherein the pressing plate is one of the optical filters.
5. The grounding structure for an optical filter according to claim 4, wherein the grounding structure has a bent structure bent at a fold parallel to two sides.