JP3708944B2 - Video display device - Google Patents

Description

  The present invention relates to a video display device, and more particularly, to a video display device that includes a color cathode ray tube and that takes measures against unnecessary radiation and discharge in a color cathode ray tube.

  In general, a video display device having a color cathode ray tube (hereinafter referred to as CRT) includes a video amplifier that amplifies a video signal and a video signal output circuit board that outputs the video signal amplified by the video amplifier. However, a wide variety of unnecessary radiated radio waves are generated from the video signal output circuit board. The source of unwanted radiated radio waves is a video amplifier that amplifies the video signal, and it is thought that the video signal output circuit board is affected via a printed wiring or a relay line connecting the boards. . The unnecessary radiated radio waves generated by the video amplifier are also transmitted to the CRT through the video signal output circuit board.

  In addition, since a high voltage of about 27 kV is applied to the CRT, there is a portion configured to maintain a predetermined insulation distance between electrodes or the like inside the CRT. However, when a foreign substance such as a metal piece is mixed at the stage of manufacturing the CRT, the insulation distance becomes short, the electrodes are short-circuited, and a phenomenon of discharge inside the CRT (called CRT in-tube discharge) may occur.

  Hereinafter, a countermeasure for suppressing the influence of unnecessary radiation waves and a countermeasure for suppressing the influence of CRT discharge in the conventional video display apparatus will be described.

  FIG. 9 is an exploded perspective view showing a video display device 90 having a video amplifier (not shown) for amplifying video signals and video signal output circuit boards 1 and 1A for outputting video signals amplified by the video amplifier. CRT 2, metal (generally iron) box-shaped outer shield 3 for removing the influence of geomagnetism on CRT 2, mounting substrate 4 to which video signal output circuit boards 1 and 1 A are mounted, video A metal box-shaped outer shield (referred to as a rear plate) 5 is shown which is attached to the mounting board 4 so as to accommodate the signal output circuit boards 1 and 1A and shields unwanted radiated radio waves. Note that the actual configuration of the video display device 90 is more complicated and has various components, but for the sake of simplification, a sparse configuration related to the present invention is omitted.

  In the video display device 90, the CRT 2 is a video signal output circuit board 1A in which a terminal 211 of an electron gun (also referred to as a neck part) 21 constituting the CRT 2 is disposed so as to cover the opening 41 of the mounting board 4. It is arrange | positioned so that it may be inserted in the socket 11 of this. The video signal output circuit boards 1 and 1A are housed in the rear plate 5 and are configured to prevent unnecessary radiation from reaching the outside. The rear plate 5 is grounded by a configuration not shown.

<Measures against unwanted radiation>
In the video display device 90, as one of the measures for suppressing the influence of unnecessary radiated radio waves, the explosion-proof band 22 wound around the display panel of the CRT 2 is set to the same potential as the external shield 3 (grounded). The method to be taken is taken.

  For this purpose, the hinge 23 attached to the four corners of the explosion-proof band 22 and the hinge 33 attached to the four corners of the outer shield 3 are screwed together, and is composed of phosphor bronze and has a spring rigidity structure. A plurality of (not shown) are arranged at positions corresponding to the explosion-proof band 22 on the inner wall surface of the outer shield 3, and the elasticity is used to contact the explosion-proof band 22.

  Further, as a measure against unnecessary radiation, as shown in FIG. 9, a grounding component (referred to as a spring) 36 having spring rigidity made of phosphor bronze is attached to the video signal output circuit boards 1 and 1A. The spring 36 is fixed to the ground pattern (disposed on the side facing the rear plate 5) of the video signal output circuit boards 1 and 1A by soldering or the like.

  Here, FIGS. 10 and 11 show an example of the ground pattern of the video signal output circuit boards 1 and 1A. Areas 14 and 14A shown in FIGS. 10 and 11 are ground patterns, and a predetermined circuit pattern is disposed in an area surrounded by the ground patterns 14 and 14A. The spring 36 is disposed in, for example, regions 15 and 15A indicated by hatching on the grounding patterns 14 and 14A.

  The spring 36 elastically contacts the inner wall surface of the rear plate 5 when the video signal output circuit boards 1 and 1A are housed in the rear plate 5, and the ground pattern of the video signal output circuit boards 1 and 1A. This has the effect of reliably fixing the potential of the portion to the ground potential.

  Such a configuration is adopted because the dimensional accuracy of the CRT 2 in the direction of the electron gun 21 includes some errors and the warp of the video signal output circuit boards 1 and 1A itself. This is because it is difficult to make the ground pattern directly contact the rear plate 5.

  In this way, the ground pattern portion of the video signal output circuit boards 1 and 1A and the rear plate 5 are connected and grounded, so that the influence of unnecessary radiated radio waves can be suppressed.

<Countermeasures for discharge in CRT tubes>
As a measure for suppressing the influence due to the discharge in the CRT tube, a method of connecting the exterior duck 24 disposed on the outer wall surface of the funnel portion FN of the CRT 2 to the external shield 3 is adopted.

  The exterior duck 24 is also called an exterior conductive film, and fixes the surface potential of the funnel portion FN by a conductive film formed by applying carbon or the like to the outer wall surface of the funnel portion FN.

  When a CRT in-tube discharge occurs, an abnormal voltage is generated, but if it is applied, an unexpected operation may occur in the video signal output circuit boards 1 and 1A. Therefore, by connecting the exterior duck 24 of the CRT 2 to the external shield 3, an abnormal voltage is prevented from being applied to the video signal output circuit boards 1 and 1A.

  For this purpose, a plurality of grounding parts (not shown) made of phosphor bronze and having spring rigidity are arranged at positions corresponding to the exterior duck 24 on the inner wall surface of the outer shield 3, and its elasticity It is the structure which contacts the exterior duck 24 using property.

  In addition, patent document 1 is mentioned as a related literature.

JP-A-9-35645

  As described above, in the conventional video display device 90, as a countermeasure against unnecessary radiation and a discharge in the CRT tube, a grounding part made of phosphor bronze and having a spring rigidity is used to The potential of the explosion-proof band 22 and the exterior duck 24 are set to the same potential, and the ground pattern of the video signal output circuit boards 1 and 1A and the potential of the rear plate 5 are set to the same potential using a spring 36 made of phosphor bronze. I was doing.

  Phosphor bronze is a material that is hard to lose its rigidity due to aging and is also effective in terms of conductivity, but it is very expensive in terms of price, and in order to enhance the grounding effect, a plurality of phosphor bronzes are arranged. Therefore, the countermeasures against unnecessary radiated radio waves and the countermeasures against discharge in the CRT tube were expensive in terms of cost. Further, since the spring 36 is attached to the ground pattern of the video signal output circuit boards 1 and 1A by soldering, the operation cost is high.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide an image display device that is provided with measures against unnecessary radiated radio waves and measures against discharge in a CRT tube, which are inexpensive.

  According to a first aspect of the present invention, there is provided a video display device having a predetermined ground pattern, arranged to be spaced apart from a video signal output circuit board for outputting a video signal, and the video signal output circuit board. A video display device comprising: a ground plate fixed at a potential; and a grounding part disposed on the ground pattern and in contact with the ground plate to fix the potential of the ground pattern to the ground potential. The grounding component is made of a stainless steel plate, is engaged with the video signal output circuit board in the thickness direction, and includes a hook for fixing the grounding component on the grounding pattern, and at least perpendicular to the grounding pattern. It is formed in a shape having elasticity in the direction.

  According to a second aspect of the present invention, in the video display device according to the present invention, the grounding component includes at least one bent portion, has a shape having elasticity in a predetermined direction, and the predetermined direction is a direction perpendicular to the grounding pattern. Are arranged on the ground pattern so as to coincide with.

  According to the video display device of the first aspect of the present invention, the grounding component is made of a stainless steel plate, is engaged so as to sandwich the video signal output circuit board in the thickness direction, and the grounding component is fixed on the grounding pattern. Since the hook is provided, it is not necessary to perform soldering for attachment to the ground pattern as in the prior art, and the operation cost can be reduced. Also, since the grounding component is elastic, the video signal output circuit board is pressed in the opposite direction to the grounding plate by bringing the grounding component attached to the video signal output circuit board into contact with the grounding plate. It is possible to eliminate the influence on the video signal output circuit board due to unnecessary radiated radio waves.

  According to the video display device of the second aspect of the present invention, it is possible to obtain a specific configuration of the grounding component which is attached to the video signal output circuit board and eliminates the influence on the video signal output circuit board due to unnecessary radiated radio waves. it can.

<A. Embodiment 1>
<A-1. Device configuration and effects>
FIG. 1 shows a means for fixing the potential of an explosion-proof band 22 wound around the display panel PN of the CRT 2, the external shield 3, and the CRT 2 in the video display device 100 according to the first embodiment of the present invention. It is a perspective view which shows the grounding component 6 which is one of these.

  The video display device 100 includes the video signal output circuit boards 1 and 1A, the mounting board 4, the rear plate 5 and the like as in the video display apparatus 90 described with reference to FIG. For this reason, the same reference numerals are given to the same configuration as the conventional one, and overlapping illustration and description are omitted.

  In FIG. 1, the grounding component 6 has a structure having elasticity by bending a rectangular stainless steel plate in the longitudinal direction so that the cross-sectional shape is substantially J-shaped, and the opening OP <b> 1 (panel side) of the outer shield 3. A plurality of openings are provided along the edges of the openings.

  The opening OP1 of the outer shield 3 has an opening size slightly wider than the outer peripheral size of the display panel PN of the CRT 2. When the CRT 2 is inserted with the electron gun 21 (see FIG. 9) as the head, the grounding component 6 is displayed on the display panel. It is configured to be elastically pressed against the explosion-proof band 22 wound around the PN. The outer shield 3 is structurally connected to other conductive members and is grounded through a power source.

  The grounding component 6 contacts the explosion-proof band 22, and the hinges 23 attached to the four corners of the explosion-proof band 22 and the hinges 33 attached to the outer four corners of the opening OP1 of the outer shield 3 face each other. The potential of the explosion-proof band 22 is also fixed to the ground potential by screwing both of them.

  Next, an example of attachment of the grounding component 6 will be described with reference to FIG. FIG. 2 is a view showing a part of the edge of the opening OP1 of the outer shield 3, and shows a socket 36 into which the grounding component 6 is inserted and fixed.

  The socket 36 is made of a conductor, and inserts and holds an end portion (referred to as one side end portion) opposite to an end portion (referred to as one end portion) that contacts the explosion-proof band 22 of the grounding component 6. A holding portion 361 is provided. The shape of the holding portion 361 is configured to match the shape of the other side end of the grounding component 6, and does not easily fall off when the other side end is inserted, and the other side end reliably contacts the outer shield 3. It is the composition to do. When the explosion-proof band 22 is contacted in this state, the potential of the explosion-proof band 22 can be fixed to the ground potential, and unnecessary radiation waves transmitted to the CRT 2 via the video signal output circuit boards 1 and 1A are transmitted to the explosion-proof band 22 and the external shield. 3 to the ground, and unnecessary radiated radio waves are prevented from being radiated to the outside.

  Here, the reason why the grounding component 6 is made of stainless steel will be described. In the video display device 90 described with reference to FIG. 9 as well, the potential of the explosion-proof band 22 is fixed to the ground potential by using a grounding component having the same shape as the grounding component 6, but it is made of phosphor bronze. . To date, stainless steel is superior in terms of spring rigidity, but there has been no example of being used for a CRT grounding part because it has lower conductivity than phosphor bronze. However, the inventor has come to confirm that even when stainless steel is used for the grounding part, there is an effect of eliminating the influence of unnecessary radiated radio waves. This is because the high-frequency current has a characteristic of flowing through the conductor surface due to the skin effect, so that the conductivity of unwanted radiated radio waves that are high-frequency cannot be discussed only by the resistivity (volume resistivity) against DC current. It is a result based on all experiments.

  Stainless steel is cheaper than phosphor bronze, and the material cost is about 1/3 to 1/5 that of phosphor bronze. Stainless steel is superior to phosphor bronze in terms of spring rigidity. If the spring rigidity is the same as that of the current phosphor bronze spring, the plate thickness of the stainless spring can be reduced. For the same reason as described above, the contact pressure with the explosion-proof band 22 is increased, so that unnecessary radiated radio waves can be more reliably flowed to the ground.

  Therefore, even if the number of grounding parts 6 arranged is larger than that of conventional grounding parts, the increase in cost can be suppressed, and conversely, by increasing the number of grounding parts, the number of grounding points can be increased, and more reliable potential fixing can be achieved. The effect of suppressing the influence of unnecessary radiated radio waves can be improved.

  Although only one side of the opening OP1 of the outer shield 3 is shown in FIG. 1, it goes without saying that a plurality of grounding parts 6 are provided along the edges of the other three sides of the opening OP1. Yes.

<A-2. Modification>
In order to improve the effect of suppressing the influence of unnecessary radiated radio waves, not only the number of grounding components 6 disposed but also the configuration described below may be adopted.

  That is, as in the video display device 100A shown in FIG. 3, stainless steel having a length substantially equal to the length of one side of the opening OP1 of the outer shield 3 (that is, substantially equal to the length of one side of the explosion-proof band 22). You may make it arrange | position the earthing | grounding components 7 made from.

  By using such a grounding part 7, the contact area of the grounding part 7 with the explosion-proof band 22 and the external shield 3 is dramatically increased, and the potential of the explosion-proof band 22 is more reliably fixed, and is caused by unnecessary radiation. The effect of suppressing the influence can be further improved.

  The structure such as the grounding part 7 is a product of the technical idea that stainless steel is used instead of phosphor bronze, which is conventionally known. In other words, from the technical idea, the grounding part is attached to one side of the explosion-proof band. It can be said that he has come up with a new technical idea that he had never thought of before, such as contacting almost the entire area.

  Here, an example of attachment of the grounding component 7 will be described with reference to FIG. FIG. 4 is a view showing a part of the edge of the opening OP1 of the outer shield 3, and shows a socket 37 into which the grounding component 7 is inserted and fixed.

  The socket 37 is made of a conductor, and inserts and holds an end (referred to as a bent side end) opposite to an end (referred to as a bent side end) that contacts the explosion-proof band 22 of the grounding component 7. A holding portion 371 is provided. The shape of the holding portion 371 is configured to match the shape of the non-bending side end portion of the grounding component 7, and does not easily fall off when the non-bending side end portion is inserted. It is the structure which contacts reliably.

  The grounding parts 6 and 7 can be attached to the outer shield 3 by using an adhesive means such as a double-sided adhesive tape having an aluminum foil as a base material, in addition to the method of inserting the sockets 36 and 37 into the above-described method. It may be fixed.

<B. Second Embodiment>
<B-1. Device configuration and effects>
5 shows an exterior duck 24 (external duck 24 (see FIG. 9) disposed on the outer wall surface of the external shield 3 and the funnel FN (see FIG. 9) of the CRT 2 (see FIG. 9) in the video display device 200 according to the second embodiment of the present invention. 9) is a perspective view showing the grounding component 8 which is one of means for fixing the potential of the external shield 3 to the ground potential, as viewed from the direction of the opening OP2 (funnel side opening) of the external shield 3. Shows the state. The opening OP2 of the outer shield 3 is located on the side opposite to the opening OP1 shown in FIG. 1, and the grounding component 8 is disposed at a position in contact with the exterior duck 24 of the CRT 2 in the outer shield 3. .

  The video display device 200 includes the CRT 2, the video signal output circuit boards 1 and 1A, the mounting board 4, the rear plate 5 and the like as in the video display apparatus 90 described with reference to FIG. Therefore, the same reference numerals are given to the same configuration as the conventional one, and the overlapping illustration and description are omitted.

  In FIG. 5, the grounding component 8 has a structure in which a rectangular stainless steel plate is bent in the longitudinal direction so that the cross-sectional shape is substantially L-shaped, and a plurality of grounding components 8 are arranged on the inner wall surface of the opening OP <b> 2 of the outer shield 3. ing.

  The grounding component 8 is attached to the outer shield 3 by connecting a conductor socket 38 provided on the inner wall surface of the outer shield 3 to an end portion (referred to as one end portion) that contacts the exterior duck 24 of the grounding component 8. Inserts and holds the opposite end (referred to as the other end). The shape of the portion (holding portion) into which the other side end portion is inserted is configured to match the shape of the other side end portion of the grounding component 8, and does not easily fall off when the other side end portion is inserted. The portion is configured to reliably contact the outer shield 3. The socket 38 is disposed on both sides of the grounding component 8.

  When the external duck 24 is contacted in this state, the potential of the external duck 24 can be fixed to the ground potential, and the abnormal voltage generated by the discharge in the CRT tube is grounded through the external duck 24, whereby the video signal output circuit The substrates 1 and 1A can be protected.

  In addition, the one side edge part of the grounding component 8 is divided into a plurality of sections, and is configured to be able to contact the exterior duck 24 reflecting the curvature of the funnel of the CRT 2 at multiple points.

  Here, the reason why the grounding component 8 is made of stainless steel will be described. In the video display device 90 described with reference to FIG. 9 as well, the potential of the exterior duck 24 is fixed to the ground potential using a grounding component having the same shape as that of the grounding component 8, but it is made of phosphor bronze. . To date, stainless steel is superior in terms of spring rigidity, but there has been no example of being used for a CRT grounding part because it has lower conductivity than phosphor bronze. However, the inventor has come to confirm that even when stainless steel is used for the grounding part, there is an effect of eliminating the influence due to the abnormal voltage generated by the discharge in the CRT tube. This is similar to the effect of suppressing the influence of the unnecessary radiated radio wave described above, the discharge in the CRT tube is a transient phenomenon, the generation of abnormal voltage is also transient, and the abnormal voltage has a high frequency property. It is because it is thought that there is.

  Stainless steel is cheaper than phosphor bronze, and the material cost is about 1/3 to 1/5 that of phosphor bronze. Stainless steel is superior to phosphor bronze in terms of spring rigidity. If the spring rigidity is the same as that of the current phosphor bronze spring, the plate thickness of the stainless spring can be reduced. Therefore, even if the number of the grounding parts 8 is increased as compared with the conventional grounding parts, the increase in cost can be suppressed, and conversely, the number of grounding points can be increased by increasing the number of the grounding parts. The effect which suppresses the influence by the discharge in a CRT tube can be improved.

  In addition, stainless steel is superior to phosphor bronze in terms of spring rigidity, and by increasing the contact pressure with the exterior duck 24, it becomes possible to flow abnormal voltage generated by discharge in the CRT tube more reliably to the ground. .

  Although only one side of the opening OP2 of the outer shield 3 is shown in FIG. 5, it goes without saying that a plurality of grounding parts 8 are provided along the edges of the other three sides of the opening OP2. Yes.

<B-2. Modification>
In order to improve the effect of suppressing the influence due to the discharge in the CRT tube, not only the number of the grounding parts 8 to be arranged but also the configuration described below may be adopted.

  That is, a stainless steel grounding component 9 having a length substantially equal to the length of one side of the opening OP2 of the outer shield 3 may be provided as in the video display device 200A shown in FIG.

  By using such a grounding component 9, the contact area of the grounding component 9 with respect to the exterior duck 24 and the external shield 3 is remarkably increased, and the potential of the exterior duck 24 is more reliably fixed. The effect of suppressing the influence can be further improved.

  The structure such as the grounding component 9 is a product of the technical idea that stainless steel is used instead of phosphor bronze, which is conventionally known. In other words, from the technical concept, the grounding component is placed on the surface of the exterior duck 24. It can be said that he has come up with a new technical idea that he had never thought of before, such as making contact over a long distance.

  The grounding component 9 is attached to the outer shield 3 by connecting a conductive socket 39 provided on the inner wall surface of the outer shield 3 to an end (referred to as one end) contacting the exterior duck 24 of the grounding component 9. Inserts and holds the opposite end (referred to as the other end). The shape of the portion (holding portion) into which the other side end portion is inserted is configured to match the shape of the other side end portion of the grounding component 9, and does not easily fall off when the other side end portion is inserted. The portion is configured to reliably contact the outer shield 3. The socket 39 is disposed on both sides of the grounding component 9.

  In addition, the one side edge part of the grounding component 9 is divided into a plurality of sections, and is configured to be able to contact the exterior duck 24 reflecting the curvature of the funnel of the CRT 2 at multiple points.

  Although only one side of the opening OP2 of the outer shield 3 is shown in FIG. 6, it goes without saying that a plurality of grounding parts 9 are provided along the edges of the other three sides of the opening OP2. Yes.

  In addition to the method of inserting the grounding parts 8 and 9 into the outer shield 3, the outer shield 3 may be attached to the outer shield 3 using an adhesive means such as a double-sided adhesive tape using aluminum foil as a base material, in addition to the method of inserting into the sockets 38 and 39. It may be fixed.

<C. Embodiment 3>
<C-1. Device configuration and effects>
7 shows the video signal output circuit boards 1 and 1A, the mounting board 4 to which the video signal output circuit boards 1 and 1A are attached, and the rear plate 5 (grounding board) in the video display device 300 according to the third embodiment of the present invention. 2 is a perspective view showing a grounding pattern of the video signal output circuit boards 1 and 1A and a grounding component 10 which is one of means for fixing the potential of the rear plate 5 to the grounding potential.

  The video display device 300 includes the CRT 2 and the external shield 3 as in the video display device 90 described with reference to FIG. 9. However, in order to clarify the characteristics, the video display device 300 has the same configuration in the conventional configuration. Reference numerals are assigned, and overlapping illustrations and descriptions are omitted.

  Here, the configuration of the grounding component 10 will be described with reference to FIG. The grounding component 10 has a structure having elasticity by bending a rectangular stainless steel plate in the longitudinal direction so that the cross-sectional shape is substantially J-shaped, and a hook 101 is provided at a non-bent portion.

  In the conventional video display device 90, the spring 36 made of phosphor bronze is soldered to the ground pattern of the video signal output circuit boards 1 and 1A. In this embodiment, instead of soldering, Two incisions of a predetermined length are put in parallel in the non-bent part of the grounding component 10 from the edge, and a hook 101 having elasticity formed by bending a section defined by the two incisions is formed on both sides. The planar portion 102 is engaged with the edge portion of the substrate so that the flat portion 102 contacts the ground pattern of the video signal output circuit substrates 1 and 1A.

  The distance L between the hook 101 and the flat portions 102 on both sides thereof is set to be approximately the same as the thickness of the video signal output circuit boards 1 and 1A, and the hook 101 is connected to the edge of the board. When combined, the edge portion of the substrate is sandwiched between the hook 101 and the flat portion 102, and the grounding component 10 is fixed by the elasticity of the hook 101.

  Then, when the video signal output circuit boards 1 and 1A are housed in the rear plate 5, the grounding component 10 contacts the inner wall surface of the rear plate 5 with elasticity, and the video signal output circuit boards 1 and 1A. It is possible to reliably fix the potential of the ground pattern portion to the ground potential and suppress the influence of unnecessary radiated radio waves.

  In addition, since soldering is not required for fixing the grounding component 10, it is possible to reduce the operating cost and take measures against unnecessary radiated radio waves at a low cost.

  In addition, stainless steel is superior to phosphor bronze in terms of spring rigidity, and the contact pressure with the inner wall surface of the rear plate 5 increases, so that unnecessary radiated radio waves can flow more reliably to the ground.

  For the same reason as described above, if the spring stiffness is the same as that of the current phosphor bronze spring, the plate thickness of the stainless spring can be reduced, and the material cost can be reduced.

  Here, the reason why the grounding component 10 is made of stainless steel will be described. In the video display device 90 described with reference to FIG. 9, the spring 36 having the same shape as that of the grounding component 10 is used, but it is made of phosphor bronze. To date, stainless steel is superior in terms of spring rigidity, but there has been no example of being used for a CRT grounding part because it has lower conductivity than phosphor bronze. However, the inventor has come to confirm that even when stainless steel is used for the grounding part, there is an effect of eliminating the influence of unnecessary radiated radio waves. This is because the high-frequency current has a characteristic of flowing through the conductor surface due to the skin effect, so that the conductivity of unwanted radiated radio waves that are high-frequency cannot be discussed only by the resistivity (volume resistivity) against DC current. It is a result based on all experiments.

  Further, phosphor bronze is inferior to stainless steel in terms of spring rigidity, and phosphor bronze has not been conceived of a configuration that can be fixed only by engagement like the grounding component 10. In other words, the configuration of the grounding component 10 is a product of the technical idea that stainless steel is used instead of phosphor bronze, which has been conventionally used. In other words, from the technical idea, the grounding component is simply engaged. It can be said that they have come up with a new technical idea that has never been expected before, such as fixing to a substrate.

  Needless to say, the countermeasures against unnecessary radiated radio waves and countermeasures against discharge in the CRT tube described in the first to third embodiments may be used in combination.

It is a figure explaining the structure of the characteristic part of Embodiment 1 of the video display apparatus based on this invention. It is a figure explaining the structure of the grounding component of Embodiment 1 of the video display apparatus concerning this invention. It is a figure explaining the structure of the characteristic part of the modification of Embodiment 1 of the video display apparatus which concerns on this invention. It is a figure explaining the structure of the grounding components of the modification of Embodiment 1 of the video display apparatus based on this invention. It is a figure explaining the structure of the characteristic part of Embodiment 2 of the video display apparatus which concerns on this invention. It is a figure explaining the structure of the characteristic part of the modification of Embodiment 2 of the video display apparatus which concerns on this invention. It is a figure explaining the structure of the characteristic part of Embodiment 3 of the video display apparatus concerning this invention. It is a figure explaining the structure of the grounding component of Embodiment 3 of the video display apparatus concerning this invention. It is a disassembled perspective view explaining the structure of a general video display apparatus. It is a figure which shows the grounding pattern of the video signal output circuit board of a general video display apparatus. It is a figure which shows the grounding pattern of the video signal output circuit board of a general video display apparatus.

Explanation of symbols

  1, 1A video signal output circuit board, 2 CRT, 3 external shield, 5 rear plate, 6-10 grounding parts, 14, 14A grounding pattern, 22 explosion-proof band, 24 exterior duck, 101 hook, OP1, OP2 opening, PN Display panel, FN funnel.

Claims (2)

A video signal output circuit board that has a predetermined ground pattern and outputs a video signal;
A ground plate disposed at a distance from the video signal output circuit board and fixed at a ground potential;
A grounding component disposed on the grounding pattern and contacting the grounding plate to fix the potential of the grounding pattern to the grounding potential,
The grounding component is made of a stainless steel plate, is engaged with the video signal output circuit board in the thickness direction, and has a hook for fixing the grounding component on the grounding pattern, and at least perpendicular to the grounding pattern. An image display device, wherein the image display device is formed in a shape having elasticity in a direction. The grounding component is
A shape including at least one bent portion and having elasticity in a predetermined direction,
The video display device according to claim 1, wherein the predetermined direction is disposed on the ground pattern so as to coincide with a direction perpendicular to the ground pattern.

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