JP2020126971A - Shield structure - Google Patents

Abstract

To provide a shield structure capable of enhancing a shield effect.SOLUTION: In a shield structure 100, a shield member 10 has a wall portion 11 rising to a positive side in a Z-axis direction and spreading in a Y-axis direction intersecting the Z-axis direction between an input connector portion 4 and a noise generating portion 5. In addition, the wall portion 11 has an extension portion 24 that passes through a slit portion 22 of a substrate 3 and extends to a negative side in the Z-axis direction beyond a main surface 3f. As a result, the extension portion 24 is extended from the main surface 3e side of the substrate 3 to the main surface 3f side through the slit portion 22, so that the wall portion 11 can suppress formation of a gap in the Z-axis direction between the substrate 3 and the shield member 10 in the vicinity of the substrate 3. Therefore, it is possible to suppress noise from leaking to the input connector portion 4 side. Further, a shielding effect can also be obtained on the main surface 3f side by the extension portion 24.SELECTED DRAWING: Figure 3

Description

The present invention relates to a shield structure.

Conventionally, as a shield structure having a shield that protects a protected portion of a substrate, one described in Patent Document 1 is known. In this shield structure, the shield covers the protected portion on the substrate.

JP, 2010-184637, A

Here, in the above-described shield structure, noise may leak from the gap between the substrate and the wall of the shield. Therefore, it has been required to enhance the shield effect of the shield structure.

An object of the present invention is to provide a shield structure that can enhance the shield effect.

The shield structure according to the present invention includes a substrate having a first main surface on one side in the first direction and a second main surface on the other side in the first direction, a noise generating unit that generates noise, A shield structure comprising a protected portion protected from noise and a shield member protecting the protected portion from noise, wherein the shield member has a first direction between the protected portion and the noise generating portion. Has a wall portion that rises to one side in the second direction and that extends in a second direction that intersects the first direction, and the substrate has a slit portion that extends in the second direction at a position corresponding to the wall portion. The part has an extension part that passes through the slit part of the substrate and extends to the other side in the first direction from the second main surface.

In the shield structure according to the present invention, the shield member has a wall portion that rises between the protected portion and the noise generating portion in one direction in the first direction and that spreads in the second direction intersecting the first direction. Have. Thereby, the shield member protects the protected portion from noise on the first main surface side of the substrate. In addition to this, the wall portion has an extension portion that passes through the slit portion of the substrate and extends toward the other side in the first direction with respect to the second main surface. Accordingly, the wall portion extends the extension portion from the first main surface side of the substrate to the second main surface side via the slit portion, so that the first portion between the substrate and the shield member is provided near the substrate. It is possible to suppress the formation of a gap in the direction. Therefore, it is possible to suppress the occurrence of noise leakage on the protected portion side. Moreover, the shield effect can be obtained also on the second main surface side by the extension portion. As described above, the shield effect can be enhanced.

The shield structure may further include a base plate that faces the second main surface of the substrate and supports the substrate, and the other end of the extension in the first direction may be arranged along the main surface of the base plate. .. In this case, since the gap between the extension and the base plate can be reduced or eliminated, the shield effect on the second main surface side can be enhanced.

In the shield structure, the extension has an end on the other side in the first direction and a side edge in the second direction, and the side edge has a first edge between the substrate and the edge. May extend substantially linearly along the direction. Unlike the hook-shaped portion for hooking the shield member on the substrate, the extension portion having such a structure can secure a large area in the vicinity of the slit portion. Therefore, the extension portion near the substrate and the second main surface side Can fully exert the shield effect in.

The shield structure further includes a base plate that faces the second main surface of the substrate and supports the substrate, and the base plate has a protrusion protruding from the main surface of the base plate toward the substrate side and extending in the second direction along the extension. The portion may be formed, and the protrusion may be arranged to face the extension in a third direction intersecting the first direction and the second direction. In this case, the protruding portion rising from the main surface of the base plate is arranged so as to cover the gap between the main surface of the base plate and the extension portion. Thereby, the shield effect can be enhanced.

According to the present invention, it is possible to provide a shield structure capable of enhancing the shield effect.

It is a schematic plan view which shows the electronic unit to which the shield structure which concerns on embodiment of this invention is applied. It is a schematic plan view which shows the shield structure which concerns on embodiment of this invention. It is a development perspective view of a shield member and a substrate. FIG. 4A is a sectional view taken along line IVa-IVa in FIG. 2. FIG. 4B is a sectional view taken along the line IVb-IVb in FIG. 2. It is sectional drawing which shows the shield structure which concerns on a modification, Comprising: It is sectional drawing corresponding to FIG.

A shield structure according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a schematic plan view showing an electronic unit to which a shield structure according to an embodiment of the present invention is applied. FIG. 2 is a schematic plan view showing the shield structure according to the embodiment of the present invention. FIG. 3 is a developed perspective view of the shield member and the substrate. FIG. 4A is a sectional view taken along line IVa-IVa in FIG. FIG. 4B is a sectional view taken along the line IVb-IVb in FIG.

As shown in FIG. 1, the electronic unit 1 is constructed by assembling the substrate 3 to the base plate 2. A lid is provided for the base plate 2, but the lid is omitted so that the substrate 3 in the base plate 2 can be seen. The electronic unit 1 is, for example, a unit such as an AC/DC power supply or a DC/DC converter.

The base plate 2 is a member that supports the substrate 3 and spreads so as to face the substrate 3. The base plate 2 has a substantially rectangular shape. Walls 6</b>A, 6</b>B, 6</b>C, 6</b>D standing upright from the base plate 2 are provided at four edges of the base plate 2. The X-axis direction and the Y-axis direction (second direction) are set with respect to the direction in which the base plate 2 spreads. Further, the Z-axis direction (first direction) is set in the thickness direction of the base plate 2. The X-axis direction is set to the direction in which the short side of the base plate 2 extends. The Y-axis direction is set to the direction in which the long side of the base plate 2 extends. Therefore, the walls 6A and 6B face each other in the X-axis direction. The wall portion 6A is arranged on the negative side in the X-axis direction, and the wall portion 6B is arranged on the positive side in the X-axis direction. The walls 6C and 6D face each other in the Y-axis direction. The wall portion 6C is arranged on the negative side in the Y-axis direction, and the wall portion 6D is arranged on the positive side in the Y-axis direction. The walls 6A, 6B, 6C, 6D rise to the positive side in the Z-axis direction.

A pattern is formed on the surface of the substrate 3, and an electronic circuit is formed by mounting electronic components on the pattern. The substrate 3 extends in the X-axis direction and the Y-axis direction so as to face the base plate 2 on the positive side in the Z-axis direction. The substrate 3 has a rectangular shape. The substrate 3 has ends 3a and 3b extending in the Y-axis direction. The end 3a is arranged on the negative side in the X-axis direction, and the end 3b is arranged on the positive side in the X-axis direction. The substrate 3 has ends 3c and 3d extending in the X-axis direction. The end 3c is arranged on the negative side in the Y-axis direction, and the end 3d is arranged on the positive side in the Y-axis direction. The ends 3a, 3b, 3c, 3d are arranged so as to face the walls 6A, 6B, 6C, 6D of the base plate 2. The substrate 3 also includes a positive-side main surface 3e (first main surface) in the Z-axis direction and a negative-side main surface 3f (second main surface) in the Z-axis direction.

In FIG. 1, the input connector portion 4 (protected portion) and the shield member 10 provided on the substrate 3 and the base plate 2 are shown. Moreover, the noise generating unit 5 is included in the components mounted on the substrate 3. Although other electronic components are provided on the substrate 3 and the periphery of the substrate 3, they are omitted in FIG. The input connector section 4 is provided at a corner between the end 3b and the end 3d of the substrate 3. The input connector section 4 is covered with a shield member 10. As a result, the shield member 10 shields the input connector unit 4 from noise generated by the noise generation unit 5 in a noise manner. The noise generator 5 is composed of electronic components that generate noise. Specifically, the noise generating unit 5 is composed of electronic components such as power semiconductors and magnetic components such as transformers and inductors. The noise generator 5 is provided near the end 3d of the substrate 3. The noise generating section 5 is arranged at a position separated from the input connector section 4 in the X-axis direction.

Next, the shield structure 100 will be described with reference to FIGS. The shield structure 100 is a structure that protects the input connector section 4 which is a protected section from noise generated by the noise generating section 5. The shield structure 100 includes the base plate 2, the substrate 3, the input connector unit 4, the noise generating unit 5, and the shield member 10 described above.

As shown in FIG. 3, the substrate 3 has an L-shaped notch 21 at a corner between the end 3b and the end 3d. The cutout portion 21 has a side portion 21a extending from the end portion 3b toward the negative side in the X-axis direction, and a side portion 21b extending from the end portion 3d toward the positive side in the Y-axis direction.

The substrate 3 has a slit portion 22. The slit part 22 extends from the intersection of the side part 21a and the side part 21b toward the positive side in the Y-axis direction. The slit portion 22 penetrates from the main surface 2e to the main surface 2f. The slit portion 22 is a portion for disposing a wall portion 11 of the shield member 10 described later. That is, the slit portion 22 is formed at a position corresponding to the wall portion 11 when the shield member 10 is mounted on the substrate 3. The size of the slit portion 22 in the width direction is larger than the thickness of the wall portion 11. However, when the wall portion 11 is arranged in the slit portion 22, the size of the gap is set to 2 mm or less in order to prevent the leakage of noise by adding the gaps on both surfaces of the wall portion 11.

As shown in FIG. 2, the input connector portion 4 includes a pair of terminal portions 31, a pair of connecting portions 32, and a pair of terminal portions 33. The pair of terminal portions 31 are provided near the side portions 21 a of the cutout portion 21 of the substrate 3, respectively. The pair of terminal portions 33 are provided in the base plate 2 at positions facing the side portion 21 a of the cutout portion 21 and the negative side in the Y-axis direction. The pair of connecting portions 32 are composed of cables or the like, and connect the respective terminal portions 31 and 33 to each other.

As shown in FIG. 3, the shield member 10 is arranged on the negative side in the X-axis direction, the wall section 12 arranged on the positive side in the X-axis direction, and the negative side in the Y-axis direction. And a wall portion 14 arranged on the positive side in the Y-axis direction and an upper wall portion 16 arranged on the positive side in the Z-axis direction. The wall portion 11 and the wall portion 12 are arranged so as to spread in the Y-axis direction and the Z-axis direction and be separated from each other in the X-axis direction. The wall portion 13 and the wall portion 14 are arranged so as to spread in the X-axis direction and the Z-axis direction and be separated from each other in the Y-axis direction. The upper wall portion 16 connects upper end portions of the respective wall portions 11, 12, 13, 14 to each other. Further, the shield member 10 has an opening on the negative side in the Z-axis direction without a wall. At the time of assembly, the shield member 10 is attached so as to cover the input connector portion 4 from above. As a result, the input connector portion 4 is surrounded by the wall portions 11, 12, 13, 14 and the upper wall portion 16.

Next, with reference to FIG. 2, the positional relationship between the shield member 10 and the other members in a state of covering the input connector portion 4 will be described. The negative-side wall portion 11 in the X-axis direction is arranged at a position overlapping the slit portion 22 of the substrate 3 and being close to and facing the side portion 21b of the cutout portion 21. The wall portion 12 on the positive side in the X-axis direction is arranged at a position close to the end portion 3b on the positive side in the X-axis direction of the substrate 3. The wall portion 13 on the negative side in the Y-axis direction is more negative in the Y-axis direction than the side portion 21a of the cutout portion 21, the terminal portion 33 of the input connector portion 4, and the end portion 3d on the negative side in the Y-axis direction of the substrate 3. It is arranged at a position separated to the side. The wall portion 14 on the positive side in the Y-axis direction is arranged on the positive side in the Y-axis direction with respect to the terminal portion 31 of the input connector portion 4. The wall portion 14 is arranged at substantially the same position as the end portion 22a of the slit portion 22 on the positive side in the Y-axis direction.

A screwing portion 17 is provided near the negative end of the wall portion 11 in the Y-axis direction. The screw fastening portion 17 is configured by bending the lower end portion of the wall portion 11 toward the negative side in the X-axis direction. The screw fastening portion 17 is screwed to the boss portion 7 of the base plate 2. A screwing portion 18 is provided near the end of the wall portion 14 on the positive side in the X-axis direction. The screw fastening portion 18 is configured by bending the lower end portion of the wall portion 14 toward the positive side in the Y-axis direction. The screw fastening portion 18 is screwed to the boss portion 8 of the base plate 2. With this structure, the shield member 10 is electrically connected to the base plate 2.

As shown in FIG. 4, the walls 11, 12, 13, and 14 are configured to rise toward the positive side in the Z-axis direction with respect to the main surface 3e of the substrate 3. The ends of the wall portions 12, 13, 14 on the negative side in the Z-axis direction are arranged at substantially the same position as the substrate 3 or at a position close to the substrate 3.

The wall portion 11 has an extension portion 24 that extends toward the negative side in the Z-axis direction from the main surface 3f via the slit portion 22 of the substrate 3. The extension portion 24 is, in the region near the end portion on the negative side in the Z-axis direction of the wall portion 11 after assembly, on the negative side in the Z-axis direction than the main surface 3e on the positive side in the Z-axis direction of the substrate 3. Is a part existing in (see FIG. 3). At the place where the extension portion 24 is formed, the wall portion 11 extends from the upper wall portion 16 to the negative side in the Z-axis direction, passes through the slit portion 22, and is located on the negative side in the Z-axis direction with respect to the main surface 3f. Extend to position. Thereby, the wall portion 11 is arranged so as to face the inner side surface of the slit portion 22 and the side portion 21b (see FIG. 2) of the cutout portion 21 in the X-axis direction. In this way, at the location where the extension portion 24 is formed, the wall portion 11 has a space (noise propagation space) in the vicinity of the substrate 3 without a gap such that the space inside the shield member 10 communicates with the space outside. ) Can be shut off.

The extension portion 24 has a negative end portion 24a in the Z-axis direction and side edge portions 24b and 24c in the Y-axis direction. The extension portion 24 has a side edge portion 24b on the negative side in the Y-axis direction and a side edge portion 24c on the positive side in the Y-axis direction. The side edge portion 24b is arranged at a position adjacent to the screw fastening portion 17 on the positive side in the Y-axis direction. The side edge portion 24c is arranged at a position adjacent to the wall portion 14 on the negative side in the Y-axis direction. The side edge portion 24b is arranged at a position closer to the wall portion 13 than the center line CL of the wall portion 11 in the Y-axis direction. The side edge portion 24c is arranged at a position closer to the wall portion 14 than the center line CL of the wall portion 11 in the Y-axis direction. Therefore, the extension portion 24 occupies a region of half or more of the wall portion 11 in the Y-axis direction, and more preferably most (for example, 80% or more, or 90% or more).

The side edge portions 24b and 24c extend substantially linearly along the Z-axis direction between the substrate 3 and the end portion 24a. That is, in the side edge portions 24b and 24c, at least in the region between the substrate 3 and the end portion 24a, no recessed portion that is recessed toward the center line CL is formed. The extension 24 does not have a hook shape that can be locked to the substrate 3. Therefore, the side edge portions 24b and 24c do not have a portion that faces the main surface 3f of the substrate 3 in the Z-axis direction by turning around the main surface 3f side. That is, a hook-shaped hook portion is formed at the lower end of the wall portion 11, the slit portion 22 of the substrate 3 is passed from the positive side to the negative side in the Z-axis direction, and then the hook portion is moved in the Y-axis direction. When moved to the positive side and hooked on the end portion 22a of the slit portion 22, the side edge portion such as the hook portion becomes the “side edge portion that extends substantially linearly along the Z-axis direction” in the present embodiment. Is not applicable.

The negative end 24 a of the extension 24 in the Z-axis direction is arranged along the main surface 2 a of the base plate 2. The main surface 2a of the base plate 2 has a flat surface extending in the X-axis direction and the Y-axis direction. Therefore, the end 24a of the extension 24 extends in the Y-axis direction while facing the main surface 2a on the positive side in the Z-axis direction so as to be substantially horizontal. Further, when the main surface 2a is formed with a stepped portion, a recessed portion, or the like, the end portion 24a of the extension portion 24 has a shape adapted to the shape change. For example, when a step portion is formed on the main surface 2a, the end portion 24a of the extension portion 24 has a step shape so as to follow the step portion. When the main surface 2a is formed with a recess, the end 24a of the extension 24 has a protrusion protruding toward the negative side in the Z-axis direction so as to enter the recess. In this embodiment, as shown in FIG. 4B, the convex portion 41 is formed on the main surface 2a. The extension part 24 has a recess 25 corresponding to the shape of the protrusion 41 at a position corresponding to the protrusion 41 on the end 24 a. The end 24a of the extension 24 is slightly separated from the main surface 2a toward the negative side in the Z-axis direction, but may be in contact with the main surface 2a.

Next, the operation and effect of the shield structure 100 according to this embodiment will be described.

The shield structure 100 according to the present embodiment has a substrate 3 having a main surface 3e on the positive side in the Z-axis direction and a main surface 3f on the negative side in the Z-axis direction, a noise generating section 5 that generates noise, and A shield structure 100 includes an input connector section 4 which is a protected section to be protected, and a shield member 10 which protects the input connector section 4 from noise. The shield member 10 includes the input connector section 4 and a noise generating section. 5 has a wall portion 11 that rises to the positive side in the Z-axis direction and spreads in the Y-axis direction that intersects the Z-axis direction, and the substrate 3 is located at a position corresponding to the wall portion 11 in the Y-axis direction. The wall portion 11 has an extension portion 24 that passes through the slit portion 22 of the substrate 3 and extends to the negative side in the Z-axis direction from the main surface 3f.

In the shield structure 100 according to the present embodiment, the shield member 10 rises between the input connector portion 4 and the noise generating portion 5 on the positive side in the Z-axis direction and spreads in the Y-axis direction intersecting the Z-axis direction. It has a wall 11. As a result, the shield member 10 protects the input connector section 4 from noise on the main surface 3e side of the substrate 3. In addition to this, the wall portion 11 has an extension portion 24 that passes through the slit portion 22 of the substrate 3 and extends toward the negative side in the Z-axis direction from the main surface 3f. As a result, the wall portion 11 extends the extension portion 24 from the main surface 3e side of the substrate 3 to the main surface 3f side via the slit portion 22, so that between the substrate 3 and the shield member 10 in the vicinity of the substrate 3. It is possible to suppress the formation of a gap in the Z-axis direction. Therefore, it is possible to suppress the occurrence of noise leakage on the input connector portion 4 side. Further, the extension portion 24 can obtain a shield effect also on the main surface 3f side. As described above, the shield effect can be enhanced.

The shield structure 100 further includes a base plate 2 that faces the main surface 3f of the substrate 3 and supports the substrate 3. The negative end 24a of the extension 24 in the Z-axis direction extends along the main surface 2a of the base plate 2. Are arranged. In this case, the gap between the extension portion 24 and the base plate 2 can be reduced or eliminated, so that the shield effect on the main surface 3f side can be enhanced.

In the shield structure 100, the extension portion 24 has a negative side end portion 24a in the Z direction and side edge portions 24b and 24c in the Y axis direction, and the side edge portions 24b and 24c are the substrate 3 and the end portion. 24a, and extends substantially linearly along the Z-axis direction. Unlike the hook-shaped portion for hooking the shield member 10 on the substrate 3, the extension portion 24 having such a structure can secure a large area in the YZ plane near the slit portion 22. It is possible to sufficiently exert the shielding effect in the vicinity of the substrate 3 and the main surface 3f side.

The present invention is not limited to the above embodiments.

Although the input connector portion 4 is illustrated as the protected portion in the above-described embodiment, the shield structure of the present invention may be applied to any portion where noise may be superimposed. In addition, the place where the shield member is arranged and the shape of the shield member may be changed as appropriate. For example, an output connector section or a terminal block may be adopted as the protected section.

In the above-described embodiment, one extension portion 24 that is continuous in the Y-axis direction is formed on one wall portion 11. Alternatively, a plurality of extensions may be formed for one wall 11. For example, when the portion corresponding to the concave portion 25 in FIG. 4B is arranged at a position higher than the main surface 3e of the substrate 3, two extended portions are provided on the negative side and the positive side in the Y-axis direction with the portion as a boundary. Will have.

As shown in FIG. 5, the base plate 2 may be formed with a protrusion 50 that rises from the main surface 2 a of the base plate 2 toward the substrate 3 and extends along the extension 24 in the Y-axis direction. The protrusion 50 is arranged so as to face the extension 24 in the X-axis direction (third direction). In this case, the protrusion 50 rising from the main surface 2a of the base plate 2 is arranged so as to cover the gap between the main surface 2a of the base plate 2 and the end 24a of the extension 24. Thereby, the shield effect can be enhanced. Although the protrusion 50 is provided on the entire region of the extension 24 in the Y-axis direction, it may be provided on a part of the extension 24 in the Y-axis direction. The protrusion 50 is provided on the negative side of the extension 24 in the X-axis direction, that is, on the outer side of the shield member 10, but is provided on the positive side of the extension 24 in the X-axis direction, that is, on the inner side of the shield member 10. You may be asked. Alternatively, the protrusions 50 may be provided on both sides of the extension 24 in the X-axis direction. Further, the projecting portion 50 faces the extension portion 24 in the X-axis direction at a position close to the extension portion 24, but does not interfere with the shield effect by X between the extension portion 24 and the extension portion 24. It may be arranged at a position where an axial gap is formed. Note that, in FIG. 5, the protrusion 50 is illustrated as a member separate from the main surface 2a of the base plate 2 for easy understanding, but the protrusion 50 is formed integrally with the main surface 2a. May be.

2... Base plate, 2a... Main surface, 3... Substrate, 3e... Main surface (first main surface), 3f... Main surface (second main surface), 4... Input connector section, 5... Noise generating section, 11 ...Walls, 24...extensions, 50...projections, 100...shield structure.

Claims (4)

A substrate having a first main surface on one side in the first direction and a second main surface on the other side in the first direction;
A noise generator that generates noise,
A protected portion protected from the noise,
A shield structure comprising a shield member for protecting the protected portion from the noise,
The shield member rises to the one side in the first direction from the first main surface between the protected portion and the noise generating portion, and intersects with the first direction. Has a wall that extends in the direction of 2,
The substrate has a slit portion extending in the second direction at a position corresponding to the wall portion,
The shield structure in which the wall portion has an extension portion that extends toward the other side in the first direction from the second main surface via the slit portion of the substrate. Further comprising a base plate facing the second main surface of the substrate and supporting the substrate,
The shield structure according to claim 1, wherein an end portion of the extension portion on the other side in the first direction is arranged along a main surface of the base plate. The extension portion has an end portion on the other side in the first direction and a side edge portion in the second direction,
The shield structure according to claim 1, wherein the side edge portion extends in a substantially linear shape along the first direction between the substrate and the end portion. Further comprising a base plate facing the second main surface of the substrate and supporting the substrate,
The base plate is formed with a protrusion that rises from the main surface of the base plate toward the substrate and extends in the second direction along the extension.
The shield according to any one of claims 1 to 3, wherein the protruding portion is arranged so as to face the extension portion in a third direction intersecting the first direction and the second direction. Construction.

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