JP2001332884A - Insulating shield device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an insulating shield device responding to a demand for less electromagnetic noise and electric noise. SOLUTION: A shield case has a duplex structure which is composed of an inside shield case 5 in which a part 16 to generate a noise is housed, and an outside shield case 2 for housing the inside shield case 5. The inside and outside shield cases 2 and 5 are electrically insulated from each other by inserting insulating films 8a, 8b, 9a, 9b, 10a, 10b, 11a, 11b, 12a, 12b, 13a and 13b between them.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an insulating shield device for reducing electromagnetic noise generated in, for example, a digital amplifier in audio equipment.

[0002]

2. Description of the Related Art A conventional insulation shield device of this type has the structure shown in FIGS. FIG. 15 is a perspective view showing an external appearance of a main part of a digital amplifier provided with a conventional insulating shield device. FIG. 16 is an exploded perspective view showing a state where a shield case lid is removed from the state shown in FIG.
And FIG. 18 shows FIG. 15 as lines VI-VI and VI, respectively.
The front and side sectional view seen by cutting by I-VII is shown.

[0003] As shown in these figures, a conventional insulated shield case device comprises a chassis 31 of a digital amplifier.
A shield case 32 composed of a shield case main body 33 and a shield case lid 34 closing the main body 33 is fixedly provided thereon.

[0004] The shield case body 33 is formed of a housing having an open upper surface, a substrate 36 is fixed to the bottom surface via supporting legs 35, ..., and a noise source such as a transistor is mounted on the side surface of the substrate 36 on the side surface. The heat radiating plate 37 to which the component 38 to be formed is fixed is fixed. On the other hand, the shield case cover 34 is formed of a housing having an open lower surface, and the chassis case 31 is closed with screws or the like while the shield case main body 33 is closed.
It is fixed to.

In the above-described conventional configuration, when a signal is input from a signal input terminal 39 derived from the shield case 32, the input signal is amplified by a component 38 serving as a noise generating source, and then amplified from a signal output terminal 40. Output to the next stage.

In this process, the noise source component 3
The electromagnetic noise generated by the component 8 is reduced by the shield case 32 surrounding the component 38, and the heat generated by the amplifying action of the component 38 is radiated by the heat radiating plate 37.

[0007]

However, in such a conventional insulating shield device, the shield case 32 is simply constituted by the shield case main body 33 and the shield case lid 34 for closing the cover. Because there is no
When the effect of reducing electromagnetic noise is small and the reduction of both electromagnetic noise and electric noise is required, the selection of materials is extremely difficult because the materials suitable for reducing each noise are different. Had. The present invention solves such a problem of the conventional insulating shield device.

[0008]

According to a first aspect of the present invention, there is provided an insulating shield device in which the component serving as the noise source is installed in a shield case in order to prevent electromagnetic noise generated from the noise source. The shield case has a double structure of an inner shield case for housing and installing the above-mentioned noise source components and an outer shield case for housing the inner shield case, and an insulating film is interposed between the inner and outer shield cases. The shield case is electrically insulated.

According to this configuration, since the shield case has a double structure of the inner shield case and the outer shield case, the effect of preventing and reducing electromagnetic noise can be increased.

Further, since the inner and outer shield cases are electrically insulated by an electric insulating film made of a material having a large effect of preventing and reducing electric and electromagnetic noise, the electromagnetic noise generated in the inner shield case is reduced. Is prevented from being transmitted directly to the outer shield case.

As a result, the effect of preventing and reducing electromagnetic noise can be increased as compared with the case of one conventional shield case. For example, the material of the inner shield case is made of copper, which is effective in preventing and reducing electric electromagnetic noise, and the material of the outer shield case is made of steel, which is effective in preventing and reducing magnetic electromagnetic noise. The effect of prevention reduction can be expected.

Further, since the inner and outer shield cases are electrically insulated by an electrical insulating film made of a material having a large effect of preventing and reducing electric and electromagnetic noise, the electromagnetic noise generated in the inner shield case is reduced. Direct transmission to the outer shield case can be prevented, and noise can be further reduced.

[0013] Further, an insulating shield device according to a second aspect of the present invention is a device in which the component serving as the noise source is installed in a shield case in a state mounted on a heat sink in order to prevent electromagnetic noise generated from the noise source. The upper end of the radiator plate is in contact with the inner surface of the upper wall of the shield case, and the upper end of the radiator plate is disposed on the inner wall surface of the upper wall near the inner surface of the upper wall of the shield case where the upper end of the radiator plate is in contact. A heat radiation hole extending along the direction is provided.

According to this configuration, since the heat radiating hole is opened in the inner surface of the upper wall of the shield case, the heat radiating action is performed from the heat radiating hole by the convection of the air in the shield case. In addition, since the upper end of the radiator plate is in contact with the inner surface of the upper wall of the shield case, the heat of the radiator plate is satisfactorily conducted to the shield case by the heat conduction due to the contact. Therefore, the heat radiation area increases, and the heat radiation effect can be increased. As a result, the heat generated from the parts
The heat is efficiently radiated by the heat radiating action from the heat radiating hole due to the convection of the air in the shield case and the heat conducting action to the shield case through the heat radiating plate, so that the heat generation at the portion can be suppressed.

[0015] The third aspect of the present invention provides an insulating shield device in which a component serving as the noise source is installed in a shield case in a state mounted on a heat sink to prevent electromagnetic noise generated from the noise source. , Wherein said shield case has a double structure of an inner shield case for housing and installing said noise source component and an outer shield case for housing said inner shield case, and an upper end of said heat sink is located above said inner shield case. A heat radiating hole extending along the longitudinal direction of the upper end of the heat sink is provided on the inner wall surface of the upper shield near the inner surface of the upper wall of the inner shield case, where the upper end of the heat sink is in contact with the inner surface of the wall. The heat radiation hole is provided on the inner surface of the upper wall facing the heat radiation hole.

According to this configuration, since the shield case has a double structure of the inner shield case and the outer shield case, the effect of preventing and reducing electromagnetic noise can be increased. In addition, heat radiation holes are opened on the inner surface of the upper wall of the inner shield case and the outer shield case, so that heat in both shield cases is efficiently radiated to the outside from the heat radiation holes by convection of air in the inner and outer shield cases. It will be.

Moreover, since the upper end of the radiator plate is in contact with the inner surface of the upper wall of the inner shield case, heat of the radiator plate is well conducted to the inner and outer shield cases by heat conduction due to the contact. . Therefore, the heat radiation area increases, and the heat radiation effect can be increased.

As a result, in the present invention, the effect of preventing and reducing electromagnetic noise can be increased as compared with the case of a single conventional shield case. For example, the material of the inner shield case is made of copper, which is effective in preventing and reducing electric electromagnetic noise, and the material of the outer shield case is made of steel, which is effective in preventing and reducing magnetic electromagnetic noise. The effect of prevention reduction can be expected.

Further, the heat generated from the components is efficiently radiated by the heat radiating action from the heat radiating hole due to the convection of the air in the inner and outer shield cases and the heat conducting action to the inner and outer shield cases via the heat radiating plate. Will be
Since the heat generation of the part can be suppressed, the heat generation of the parts can be efficiently suppressed.

According to a fourth aspect of the present invention, there is provided an insulating shield device wherein the component serving as the noise source is installed in a shield case in order to prevent electromagnetic noise generated from the noise source. It has a double structure of an inner shield case for storing and installing the noise source component and an outer shield case for storing the inner shield case, and penetrates vertically through the upper and lower wall surfaces of the inner and outer shield cases near the above components. And a shield pipe is installed in the inner shield case so that the upper and lower openings are aligned with the upper and lower through heat outlets.

According to this configuration, since the shield case has a double structure of the inner shield case and the outer shield case, the effect of preventing and reducing electromagnetic noise can be increased. In addition, through-holes provided on the wall surfaces of the inner shield case and the outer shield case, respectively, reduce the occurrence of convection of air in both shield cases and reduce the heat radiation effect. Moreover, since the shield pipe is provided in the inner shield case so that the upper and lower opening ends coincide with the through heat radiation holes of the inner and outer shield cases, it is possible to prevent leakage of electromagnetic noise due to the above heat radiation holes, The effect of preventing and reducing electromagnetic noise can be expected.

As a result, since the shield case has a double structure, the effect of preventing and reducing electromagnetic noise can be increased as compared with the case of one conventional shield case. Further, the heat generated from the components is efficiently radiated by the radiation from the through-radiation opening due to the convection of the air in the inner and outer shield cases, and the heat generation of the components can be suppressed as much as possible.

According to a fifth aspect of the present invention, there is provided an insulated shield device wherein the component serving as the noise source is installed in a shield case with the component serving as the noise source mounted on a heat sink in order to prevent electromagnetic noise generated from the noise source. The shield case has a double structure of an inner shield case for housing and installing the component and an outer shield case for housing the inner shield case, and upper and lower wall surfaces of the inner and outer shield cases near the component and the heat sink. The upper and lower shield pipes are inserted and arranged in the through-holes of the heat sink so that the upper and lower openings coincide with the upper and lower through-holes of the inner shield case. It is characterized by the following.

According to this structure, since the shield case has a double structure of the inner shield case and the outer shield case, the effect of preventing and reducing electromagnetic noise can be increased. In addition, through heat radiation holes provided on each wall of the inner shield case and outer shield case,
Convection of air occurs in the shield case and the air flow becomes cheaper, and the heat radiation effect can be enhanced. In addition, since the shield pipe is inserted through the heat radiation openings of the inner shield case and the outer shield case, it is possible to prevent electromagnetic noise from leaking through the heat radiation holes.

As a result, since the shield case has a double structure, the effect of preventing and reducing electromagnetic noise can be increased as compared with the case of a single conventional shield case. Further, the heat generated from the components is efficiently radiated by the radiation from the through-radiation opening due to the convection of the air in the inner and outer shield cases, and the heat generation of the components can be suppressed as much as possible.

According to a sixth aspect of the present invention, in the insulating shield device of the first aspect, the insulating film is formed of an insulating material having good thermal conductivity.

According to this structure, the insulating film is formed of a material having good thermal conductivity and a high property of preventing and reducing electric and electromagnetic noise, such as a silicon rubber material. As a result, the heat generated by the components is sufficiently transmitted not only to the inner shield case but also to the outer shield case, increasing the heat radiation area and increasing the heat radiation effect, minimizing the heat generated by the components. Can be.

Further, the insulation shield device of the seventh invention is characterized in that the inner and outer shield cases are respectively formed by a main body and a lid. According to this configuration,
Since the inner and outer shield cases are formed by the main body and the lid, assembly and disassembly of each shield case can be easily performed. As a result, since the inner and outer shield cases are formed by the main body and the lid, it is possible to provide an insulating shield device that is easily disassembled and easy to perform maintenance and inspection.

[0029]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIG. 1 is an external perspective view of a main part of a digital amplifier provided with an insulating shield device according to a first embodiment of the present invention, and FIG. Exploded perspective views, FIGS. 3 and 4 show FIG. 1 along lines II and II-
It is the front and side sectional view seen by cutting by II. In these figures, 1 is a chassis housing of a digital amplifier, 2
Is an outer shield case, which comprises an outer shield case main body 3 and an outer shield case lid 4.

The outer shield case main body 3 is formed of a metal frame having a rectangular upper surface with an open upper surface. The outer shield case main body 3 is fixed to the upper surface of the chassis housing 1 and has electromagnetic noise at both ends of the inner bottom surface. And insulating films 8a and 8 made of an insulating material having a large effect of preventing and reducing magnetic electromagnetic noise
b is fixed.

The outer shield case lid 4 is formed of a metal frame having a rectangular upper surface with an open bottom surface, and has mounting pieces 4a, 4a at both ends in the longitudinal direction. The outer shield case lid 4 is fitted to the upper surface of the outer shield case main body 3 from the upper surface thereof, and is fixed to the upper surface of the chassis 1 via the mounting pieces 4a, 4a with the main body 3 closed. Have been. Reference numeral 5 denotes an inner shield case, which includes an inner shield case body 6 and an inner shield case lid 7.

The inner shield case main body 6 is formed of a metal frame having a rectangular upper surface with an open upper surface. The inner shield case main body 6 is accommodated in the outer shield case main body 3 via the insulating films 8a and 8b. It is placed on the bottom surface of the outer shield case body 3. The inner shield case lid 7 is formed of a metal frame having a rectangular top surface with an open bottom, and is fitted to the upper surface of the inner shield case main body 6 to close the main body 6. It has a configuration.

Reference numerals 9a, 9b, 10a, and 10b denote insulating films fixed to the outer surfaces of the side walls of the inner shield case body 6, respectively, and are formed of the same material as the insulating film 8a. When the inner shield case body 6 and the lid 7 are closed, the insulating films 9a, 9b,
It is in a state of being electrically insulated by 10a and 10b.

The inner shield case lid 7 has insulating films 11a, 11b, 12a, 12b formed of the same material as the insulating film 8a on the outer surface and upper wall of each side wall.
, 13a and 13b are fixed, the inner shield case cover 6 is closed with the inner shield case cover 7, and the outer shield case body 3 is fixed with the outer shield case cover 4.
When the cover is closed, each insulating film electrically insulates the inner surface of each side wall of the outer shield case main body 3 and the inner surface of the upper wall of the outer shield case lid 4.

Reference numeral 14 denotes a circuit board mounted on the inner bottom surface of the inner shield case main body 6 via support legs 14a. A heat radiating plate 15 having a plurality of heat radiating fins 15a is erected on the circuit board 14. I have. Reference numeral 16 denotes an electrical or electronic component which becomes a noise generation source such as a transistor or an FET fixed to one side surface of the heat sink 15.

Reference numerals 17 and 18 denote a signal input terminal and a signal output terminal, one ends of which are connected to the circuit board 6, respectively, and the other ends of which are connected to both ends of the inner shield case main body 6 and the outer shield case main body 3 in the longitudinal direction. Insertion 6 provided on the side wall
a and 3a are led out of the outer shield case main body 3.

As described above, in the insulating shield device of the first embodiment, the shield case has a double structure of the inner and outer shield cases 2 and 5, and the inner shield case 2 is housed in the outer shield case 5. Therefore, the effect of preventing and reducing electromagnetic noise can be increased as compared with the case of one conventional shield case. Further, for example, the material of the inner shield case 5 is made of copper, which is effective in preventing and reducing electric and electromagnetic noise, and the material of the outer shield case 2 is made of steel, which is effective in preventing and reducing magnetic and electromagnetic noise. The effect of preventing and reducing electromagnetic noise can be expected.

In the insulating shield device of the first embodiment, the inner and outer shield cases 2 and 5 are electrically insulated by an electrically insulating film of a material having a large effect of preventing and reducing electric and electromagnetic noise. This prevents electromagnetic noise generated in the inner shield case from directly transmitting to the outer shield case.

The electromagnetic wave is generated by an electric field and a magnetic field whose intensity changes with time are induced alternately. By forming the shield case into a double structure, the electromagnetic wave generated in the inner shield case 5 causes the electromagnetic wave to be generated. The change is not easily transmitted to the outer shield case because there is no direct conduction between the two shield cases. As a result, electromagnetic waves are less likely to be induced, and the shielding effect is improved. Of course, the noise leaking to other parts through the chassis housing from the outer shield case is reduced.

FIG. 5 is a diagram comparing a case where the inner and outer shield cases 2 and 5 are electrically connected (dotted line) with a case where they are electrically insulated (solid line). As can be seen from this figure, it is clear that the present invention, which is electrically insulated, reduces electromagnetic noise.

[Second Embodiment] FIG. 6 is an external perspective view of a main part of a digital amplifier provided with an insulating shield device according to a second embodiment of the present invention, and FIG. 8 and 9 show FIG. 6 by lines III-III and IV.
It is the front and side sectional view seen by cutting at -IV.

The insulating shield device of the second embodiment is substantially the same as the first embodiment, except that the outer shield case lid 4 and the inner shield case lid are different. 7 is that the heat radiation holes 19 and 20 are opened on the upper wall surface, and the upper edge and the side edge of the heat radiation plate 15 are respectively in contact with the inner wall surface of the inner shield case body 6 and the inner shield case lid 7. It is in. FIG. 10 is a view showing the shape of the heat radiating hole 19. As shown in FIG. 10, a slit 19 a is formed along the heat radiating plate 15 on the upper wall surface of the outer shield case lid 4 facing the heat radiating plate 15.
One side of 9a is formed in a comb shape, and each comb piece 19b is made to correspond to the radiation fin 15. The shape of the heat dissipation hole 20 is the heat dissipation hole 1
It is exactly the same as the shape of No. 9.

FIG. 11 shows the shape of the heat radiating plate 15 of the second embodiment. As is clear from this figure, the side wall surface of the heat radiating plate 15 has the inner shield case body 6 and the inner shield case lid. 7 has a step 15b that matches the step. The heat radiating holes 19 and 20 are connected to the heat radiating plate 15.
, And faces the base of the radiation fin 15a. This is for the purpose of arranging at a position where a radiation effect can be obtained while preventing leakage of electromagnetic noise as much as possible.

As described above, in the insulating shield device according to the second embodiment, the heat radiation holes 19 and 20 are opened in the upper surface walls of the outer shield case lid 4 and the inner shield case lid 7, respectively. The heat radiation action is performed from the heat radiation holes 19 and 20 by the convection of the air in the case 5.

Further, since the upper edge and the side edge of the heat radiating plate 15 are in contact with the inner surface of the upper wall of the inner shield case body 6 and the inner shield case lid 7, respectively, the heat conduction by the abutment causes the inner shield case to be in contact with the inner shield case. 5, the heat of the heat radiating plate 15 is less likely to be conducted, so that the heat radiating area is increased and the heat radiating effect can be increased.

[Third Embodiment] FIG. 12 is an external perspective view of a main part of a digital amplifier provided with an insulating shield device according to a third embodiment of the present invention. FIG. 13 is an exploded perspective view thereof. FIG. 14 is a front cross-sectional view of FIG. 12 taken along line VV.

As shown in these figures, each of the chassis 1, the outer shield case main body 3, the inner shield case main body 6, the circuit board 14, the heat sink 15, the inner shield case lid 7, and the outer shield case lid 4 is provided. At the position facing the heat radiating plate 15 on the plate surface, a plurality of through heat radiating ports 21 to 27 are respectively provided so as to communicate vertically.

In this embodiment, the heat radiating plate 15 is
In addition, instead of the shape having the heat radiation fins 15a as in the second embodiment, the through heat radiation hole 2 is formed in a metal block body.
.. Are vertically penetrated. Furthermore, in this embodiment, the through-radiation holes 2324 and 26 of the inner shield case main body 6, the circuit board 14, and the inner shield case lid 7 are inserted so that the effect of preventing and reducing electromagnetic noise is not impaired at each of the through-radiation holes. Shield pipe 28 is provided. This pipe is made of the same copper as the inner shield case lid 7.

With the above configuration, the through heat radiation provided on each plate surface of the chassis 1, the outer shield case main body 3, the inner shield case main body 6, the circuit board 14, the inner shield case lid 7 and the outer shield case lid 4 is provided. Mouth 2
Due to 1, 22, 23, 24, 26, and 27, convection of air occurs in the shield case and the air flow is reduced, and the heat radiation effect can be enhanced.

Moreover, the through-holes 2 of the inner shield case main body 6, the circuit board 14, and the inner shield case lid 7 are provided.
By providing the shield pipe 28 through which the holes 3, 24 and 26 are inserted, it is possible to prevent the leakage of the electromagnetic noise due to the through-holes, and to reduce the electromagnetic noise as in the first and second embodiments. Prevention and reduction effects can be expected.

[Fourth Embodiment] In the present invention, the fourth embodiment
In this embodiment, the insulating film in each of the above embodiments is formed of a material having good thermal conductivity and a high property of preventing and reducing electric and electromagnetic noise, such as a silicon rubber material. With this configuration, the heat generated in the component 16 is sufficiently transmitted to the chassis 1 and the outer shield case 2, and as a result, the heat radiation area is increased, and the heat radiation effect can be increased.

[0052]

According to the present invention, in order to prevent the electromagnetic noise generated from the noise source from being installed, the component serving as the noise source is installed in the shield case. The inner shield case for accommodating and installing the components and the outer shield case for accommodating the inner shield case have a double structure, and both shield cases are electrically insulated by interposing an insulating film between the inner and outer shield cases. Since the shield case has a double structure of the inner shield case and the outer shield case, the effect of preventing and reducing electromagnetic noise can be increased.

Further, since the inner and outer shield cases are electrically insulated by an electrical insulating film made of a material having a large effect of preventing and reducing electric and electromagnetic noise, the electromagnetic noise generated in the inner shield case is reduced. Is prevented from being transmitted directly to the outer shield case. As a result, the effect of preventing and reducing electromagnetic noise can be increased as compared with the case of a single conventional shield case. For example, the material of the inner shield case is made of copper, which is effective in preventing and reducing electric electromagnetic noise, and the material of the outer shield case is made of steel, which is effective in preventing and reducing magnetic electromagnetic noise. The effect of prevention reduction can be expected.

Further, since the inner and outer shield cases are electrically insulated by an electrical insulating film made of a material having a large effect of preventing and reducing electric and electromagnetic noise, the electromagnetic noise generated in the inner shield case is reduced. Direct transmission to the outer shield case can be prevented, and noise can be further reduced.

Further, the insulating shield device according to the present invention is arranged such that the component serving as the noise source is installed in a shield case with the component serving as the noise source mounted on a heat sink in order to prevent electromagnetic noise generated from the noise source. The upper end of the heat sink is brought into contact with the inner surface of the upper wall of the shield case, and the upper end of the upper surface of the heat sink near the inner surface of the upper wall of the shield case with which the upper end of the heat sink is in contact in the longitudinal direction of the upper end of the heat sink. Since the heat dissipation hole extends along the heat dissipation hole, the heat dissipation action is performed from the heat dissipation hole by the convection of the air in the shield case.

Further, since the upper end of the radiator plate is in contact with the inner surface of the upper wall of the shield case, the heat of the radiator plate is satisfactorily conducted to the shield case by the heat conduction due to the contact. Therefore, the heat radiation area increases, and the heat radiation effect can be increased. As a result, in the present invention, the heat generated from the parts is efficiently radiated by the heat radiating action from the heat radiating holes due to the convection of the air in the shield case and the heat conducting action to the shield case through the heat radiating plate. In addition, heat generation of components can be suppressed.

Further, the insulating shield device of the present invention is arranged such that the noise source is installed in a shield case in a state where the component serving as the noise source is mounted on a heat sink in order to prevent electromagnetic noise generated from the noise source. The shield case has a double structure of an inner shield case for housing and installing the component serving as the noise source, and an outer shield case for housing the inner shield case, and an upper end of the heat sink is an inner surface of an upper wall of the inner shield case. While contacting
A heat radiation hole extending along the longitudinal direction of the upper end of the heat radiator plate is provided on the inner wall surface of the upper wall near the inner surface of the upper wall of the inner shield case where the upper end of the heat radiator plate is in contact, and faces the heat radiator hole. Since the heat dissipation hole is provided on the inner surface of the upper wall of the outer shield case, the shield case has a double structure of the inner shield case and the outer shield case, thereby increasing the effect of preventing and reducing electromagnetic noise. can do.

Further, since the heat radiating holes are opened on the inner surfaces of the upper walls of the inner shield case and the outer shield case, heat in both the shield cases is efficiently removed from the heat radiating holes by the convection of the air in the inner and outer shield cases. Heat is dissipated. In addition, since the upper end of the radiator plate is in contact with the inner surface of the upper wall of the inner shield case, heat of the radiator plate is favorably conducted to the inner and outer shield cases by heat conduction due to the contact. Therefore, the heat radiation area increases, and the heat radiation effect can be increased.

As a result, according to the present invention, the effect of preventing and reducing electromagnetic noise can be increased as compared with the case of one conventional shield case. For example, the material of the inner shield case is made of copper, which is effective in preventing and reducing electric electromagnetic noise, and the material of the outer shield case is made of steel, which is effective in preventing and reducing magnetic electromagnetic noise. The effect of prevention reduction can be expected.

Further, the heat generated from the parts is efficiently radiated by the heat radiating action from the heat radiating holes due to the convection of the air in the inner and outer shield cases and the heat conducting action to the inner and outer shield cases via the heat radiating plate. Will be
Since the heat generation of the part can be suppressed, the heat generation of the parts can be efficiently suppressed.

In addition, according to the insulating shield device of the present invention, in order to prevent the electromagnetic noise generated from the noise source, the component serving as the noise source is installed in the shield case. A double structure of an inner shield case for housing and installing a source component and an outer shield case for housing the inner shield case, and penetrating vertically through upper and lower wall surfaces of the inner and outer shield cases near the component; Since the heat radiation outlet is provided and the shield pipe is installed in the inner shield case so that the upper and lower opening ends coincide with the upper and lower through heat radiation holes, the shield case is doubled of the inner shield case and the outer shield case. With the structure, the effect of preventing and reducing electromagnetic noise can be increased.

Further, through heat radiation holes provided on each wall surface of the inner shield case and the outer shield case, respectively,
Convection of air occurs in both shield cases, which reduces the heat dissipation and enhances the heat radiation effect. Moreover, since the shield pipe is provided in the inner shield case so that the upper and lower opening ends coincide with the through heat radiation holes of the inner and outer shield cases, it is possible to prevent leakage of electromagnetic noise due to the above heat radiation holes, The effect of preventing and reducing electromagnetic noise can be expected. As a result, in the present invention, since the shield case has a double structure, the effect of preventing and reducing electromagnetic noise can be increased as compared with the case of a single conventional shield case. Further, the heat generated from the components is efficiently radiated by the radiation action from the radiation holes due to the convection of the air in the inner and outer shield cases, and the heat generation of the components can be suppressed as much as possible.

The present invention also provides an insulating shield device according to the present invention, wherein in order to prevent electromagnetic noise generated from a noise source, the component serving as the noise source is installed in a shield case in a state mounted on a heat sink. The shield case includes an inner shield case for housing and installing the above components, and an outer shield case for housing the inner shield case.
The upper and lower walls of the inner and outer shield cases near the component and the heat sink are provided with through heat radiating ports vertically penetrating therethrough. Since the configuration is such that the through-holes of the radiator plate are inserted so as to match the through-holes at the top and bottom of the shield case, the shield case has a double structure of the inner shield case and the outer shield case. The effect of preventing and reducing electromagnetic noise can be increased.

Further, through heat radiation holes provided on each wall surface of the inner shield case and the outer shield case, convection of air occurs in the shield case, thereby reducing the cost.
The heat radiation effect can be enhanced. In addition, since the shield pipe is inserted through the heat radiation openings of the inner shield case and the outer shield case, it is possible to prevent electromagnetic noise from leaking through the heat radiation holes.

As a result, in the present invention, the conventional shield case 1
The effect of preventing and reducing the electromagnetic noise can be increased as compared with the two cases. Also, the heat generated from the parts will be efficiently radiated by the radiating action from the radiating holes due to the convection of the air in the inner and outer shield cases,
Heat generation of parts can be suppressed as much as possible.

Further, since the insulating shield device of the present invention has a structure in which the insulating film is formed of an insulating material having good heat conductivity, the insulating film has good heat conductivity, and has a property of preventing and reducing electric and electromagnetic noise. , For example, a silicon-based rubber material. As a result, the heat generated in the components is sufficiently transmitted to the outer shield case as well as the inner shield case, so that the heat radiation area can be increased and the heat radiation effect can be increased, and the heat generation of the components can be suppressed as much as possible. be able to.

Further, since the insulating shield device of the present invention has a configuration in which the inner and outer shield cases are respectively formed by the main body and the lid, the inner and outer shield cases are formed by the main body and the lid. Assembly and disassembly of the shield case can be easily performed. As a result, since the inner and outer shield cases are formed by the main body and the lid, it is possible to provide an insulating shield device that is easily disassembled and easy to perform maintenance and inspection.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a main part of a digital amplifier including an insulating shield device according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a state where a shield case lid is removed from a shield case main body in the same insulating shield device.

FIG. 3 is a front sectional view of the same insulating shield device as cut along a line II.

FIG. 4 is a side sectional view of the same insulating shield device as cut along a line II-II.

FIG. 5 is a characteristic diagram showing a relationship between an electromagnetic noise output and a frequency in the insulating shield device.

FIG. 6 is an external perspective view of a main part of a digital amplifier including an insulating shield device according to a second embodiment of the present invention.

FIG. 7 is an exploded perspective view showing a state where a shield case lid is removed from a shield case main body in the same insulating shield device.

FIG. 8 is a front sectional view of the same insulating shield device as cut along a line III-III.

FIG. 9 is a side cross-sectional view of the same insulating shield device as viewed along line IV-IV.

FIG. 10 is an enlarged view of a main part of an outer shield case lid in the same insulating shield device.

FIG. 11 is an external perspective view of a heat sink in the insulating shield device.

FIG. 12 is an external perspective view of a main part of a digital amplifier including an insulating shield device according to a third embodiment of the present invention.

FIG. 13 is an exploded perspective view showing a state where a shield case lid in the insulating shield device is removed from a shield case main body.

FIG. 14 is a front cross-sectional view of the above insulating shield device, taken along line VV.

FIG. 15 is an external perspective view of a main part of a digital amplifier provided with a conventional insulating shield device.

FIG. 16 is an exploded perspective view showing a state in which a shield case lid of the conventional insulating shield device is removed from the shield case main body.

FIG. 17 shows a conventional upper insulating shield device taken along line VI-VI.
It is the front sectional view cut and seen in FIG.

FIG. 18 shows the conventional upper insulating shield device as a line VII-V.
FIG. 2 is a side sectional view taken along a line II.

[Explanation of symbols]

 Reference Signs List 1 chassis housing 2 outer shield case 3 outer shield case main body 4 outer shield case lid 5 inner shield case 6 inner shield case main body 7 inner shield case lid 8a, 8b insulating films 9a, 9b insulating films 10a, 10b insulating films 11a, 11b Insulating film 12a, 12b Insulating film 13a, 13b Insulating film 14 Circuit board 15 Heatsink 16 Components 19 Heatsink 20 Heatsink 22-27 Through heatsink 28 Shield pipe

Claims (7)

[Claims] 1. A method of installing a component serving as a noise source in a shield case for preventing electromagnetic noise generated from a noise source, wherein the shield case houses the component serving as a noise source. Insulation characterized by having a double structure of an inner shield case and an outer shield case accommodating the inner shield case, and electrically insulating both shield cases by interposing an insulating film between the inner and outer shield cases. Shield device. 2. A device in which a component serving as a noise source is installed in a shield case with the component serving as the noise source mounted on a heat sink to prevent electromagnetic noise generated from the noise source. A heat radiating hole extending along the longitudinal direction of the upper end of the heat radiating plate is provided on the inner wall surface of the upper wall near the inner surface of the upper wall of the shield case where the upper end of the heat radiating plate is in contact with the inner surface of the upper wall of the case. Insulated shield mounting characterized by being provided. 3. A device in which a component serving as a noise source is installed in a shield case in a state of being mounted on a heat sink to prevent electromagnetic noise generated from the noise source. And an outer shield case for housing the inner shield case. The upper end of the radiator plate is brought into contact with the inner surface of the upper wall of the inner shield case. A heat radiation hole extending along the longitudinal direction of the upper end of the heat sink is provided on the inner wall surface of the upper wall near the inner surface of the upper wall of the inner shield case where the upper end of the plate is in contact, and the outer surface facing the heat radiation hole is provided. An insulating shield device, wherein a heat dissipation hole is provided in an inner surface portion of an upper wall of a shield case. 4. A method of installing the component serving as the noise source in a shield case in order to prevent electromagnetic noise generated from the noise source, wherein the shield case houses the component serving as the noise source. The inner shield case and the outer shield case accommodating the inner shield case have a double structure, and the upper and lower wall surfaces of the inner and outer shield cases near the components are provided with through heat radiation ports vertically penetrating therethrough. An insulated shield device, wherein a shield pipe is installed in an inner shield case so that upper and lower opening ends coincide with a through heat radiation port. 5. A device in which a component serving as a noise source is installed in a shield case with the component being a noise source mounted on a heat sink to prevent electromagnetic noise generated from the noise source. A through-hole having a double structure of an inner shield case to be installed and an outer shield case for accommodating the inner shield case, and penetrating vertically through the upper and lower wall surfaces of the inner and outer shield cases near the component and the heat sink. A shield pipe having upper and lower openings, wherein the upper and lower openings are inserted into the through heat radiating holes of the heat sink so that the upper and lower openings coincide with the upper and lower heat radiating holes of the inner shield case. . 6. The insulating shield device according to claim 1, wherein said insulating film is formed of an insulating material having good thermal conductivity. 7. The apparatus according to claim 1, wherein said inner and outer shield cases are respectively formed by a main body and a lid.
The insulating shield device described in 3, 4, 5, and 6.