JP2019096646A - Electronic equipment - Google Patents

Abstract

To provide electronic equipment in which securing of holding force is compatible with securing of conduction performance.SOLUTION: Electronic equipment 100 includes a circuit board 10, a shield case 20 and multiple clips 30. The shield case 20 has a shield wall 21 surrounding the electric circuit part of the circuit board 10, and shields the noise radiated the noise generation source, i.e., the electric circuit part, by means of the shield wall 21. The clip 30 has a protrusion in the shape of protruding toward the shield wall 21, and an outside arm part and an inside arm part for pressing the protrusion against the shield wall 21. Each clip 30 conducts the shield wall 21 and the ground circuit part of the circuit board 10, and holds the shield case 20 on the circuit board 10. Some of the multiple protrusions are fitted in the fitting holes of the shield wall 21, and other protrusions are in contact with the flat wall range where the fitting holes are not formed.SELECTED DRAWING: Figure 1

Description

  The disclosure of this specification relates to an electronic device.

  Conventionally, for example, Patent Document 1 discloses an electronic device provided with a shield case that shields noise. The shield case of Patent Document 1 includes a frame having a shape surrounding a circuit portion provided on a substrate, and a cover having a shape covering the frame. The cover has a plurality of protrusions projecting toward the frame, and each protrusion can be pressed against the outer surface of the frame. The cover is held by the frame and brought into conduction with the frame by fitting the protrusions to the plurality of housing portions provided on the outer surface of the frame.

JP 2014-175400 A

  Now, in the electronic device of patent document 1, all the projection parts provided in the cover are fitting to the accommodating part provided in the case. Thus, the cover can be held firmly to the frame. However, when the position of the cover is deviated from the normal position with respect to the frame, the contact state between the protrusion and the accommodating portion is likely to change. Therefore, the conduction performance between the cover and the frame could also fluctuate greatly.

  An object of the present disclosure is to provide an electronic device capable of achieving both of securing of holding power and securing of conduction performance.

  In order to achieve the above object, one aspect disclosed is a circuit board (10) having an electric circuit portion (11) as a noise source and a ground circuit portion (15), and a shape surrounding the electric circuit portion A case member (20, 220, 320, 520, 620) having a shielding wall (21) and shielding noise emitted from the electric circuit portion by the shielding wall, and a shape projecting convexly toward the shielding wall A plurality of convex portions (37) and pressing portions (33a, 33b) pressing the convex portions against the shielding wall to electrically connect the shielding wall to the ground circuit portion and hold the case member on the circuit board And a part of the plurality of projections fit into the fitting hole (24) formed in the shielding wall by the pressing force of the pressing part, and the plurality of projections Another part is a fitting hole in the shielding wall by the pressing force of the pressing portion There is an electronic device in contact with the wall surface ranges (26) which is not formed.

  In the electronic device of this aspect, the plurality of convex portions provided in the plurality of holding members are pressed against the light shielding wall. And a part of some convex part is fitted in the fitting hole part formed in the shielding wall by pressing by a press part, and enables strong holding | maintenance of the case member by a holding member. On the other hand, the other part of the plurality of convex portions contacts the wall surface range in which the fitting hole portion is not formed in the shielding wall. Therefore, even when the position of the case member is deviated from the normal position with respect to the circuit board, the contact state between the convex portion and the shielding wall hardly changes. Therefore, the conduction performance between the shielding wall and the ground circuit can be maintained. As described above, according to the configuration in which the location where the projection is fitted in the fitting hole and the location where the protrusion is not fitted in the fitting hole are both provided, the holding force for holding the case member to the circuit board It is possible to achieve both securing and securing of the conduction performance between the case member and the ground circuit portion.

  Moreover, one aspect disclosed is a circuit board (10) having an electric circuit portion (11) as a noise source and a ground circuit portion (15), and radiation from the electric circuit portion by a shape surrounding the electric circuit portion Conduction between the case member (420) electrically connected to the ground circuit, the cover surface (441) covering the case member, and the cover surface and the shielding wall. A cover member (440) having a plurality of holding portions (430) for holding the cover surface portion on the case member, and the holding portion has a projection (37) having a shape projecting toward the shielding wall. And a pressing portion (433) for pressing the convex portion against the shielding wall, and a part of the plurality of convex portions is a fitting hole (24) formed in the shielding wall by the pressing force of the pressing portion. Other parts of the plurality of convex parts Some are an electronic device in contact with the wall surface ranges (26) the fitting hole portion is not formed within the shield wall by pressing force of the pressing portion.

  In this aspect, a part of the plurality of convex portions is fitted into the fitting hole formed in the shielding wall by pressing by the pressing portion. Therefore, the cover member can be firmly held by the case member. On the other hand, the other part of the plurality of convex portions is in contact with the wall surface range in which the fitting hole portion is not formed in the shielding wall. Therefore, even when the position of the cover member is deviated from the normal position with respect to the case member, the contact state between the convex portion and the shielding wall hardly changes. Therefore, the conduction performance between the cover member and the case member can be maintained. As described above, according to the configuration in which the holding portion for fitting the convex portion into the fitting hole and the holding portion for not fitting the convex portion into the fitting hole are provided together, the holding force for holding the cover member to the case member It is possible to achieve both the securing of and the securing of the conduction performance between the cover member and the case member.

  The reference numerals in the parentheses above merely show an example of the correspondence with specific configurations in the embodiments to be described later, and do not limit the technical scope at all.

It is a perspective view which shows the periphery of the shield case in an electronic device. It is a figure which shows an example of the electric circuit part shielded by a shield case. It is an expanded view which shows the shape of the upper surface of the shield case by 1st embodiment, and each side. It is a perspective view of a clip. FIG. 5 is a front view of the clip as seen in the direction of arrow V in FIG. 4; Figure 6 is a side view of the clip as seen in the direction of arrow VI of Figure 5; It is an enlarged view which shows the detailed shape of a fitting hole part. It is sectional drawing which shows the state which the clip hold | maintained the perforated wall part. It is sectional drawing which shows the state which the clip hold | maintained the non-porous wall part. It is a perspective view which shows the periphery of the shield case of 2nd embodiment. It is an expanded view which shows the shape of the upper surface of the shield case of 2nd embodiment, and each side. It is a perspective view which shows the periphery of the shield case of 3rd embodiment. It is an expanded view which shows the shape of the upper surface and each side surface of the shield case of 3rd embodiment. It is a perspective view which shows the shield structure of the electronic device of 4th embodiment. FIG. 16 is a perspective view showing the periphery of a shield case of Modification Example 1; FIG. 18 is a perspective view showing the periphery of a shield case of Modification 2;

  Hereinafter, a plurality of embodiments of the present disclosure will be described based on the drawings. In addition, the overlapping description may be abbreviate | omitted by attaching the same code | symbol to the corresponding component in each embodiment. When only a part of the configuration is described in each embodiment, the configuration of the other embodiments described above can be applied to other parts of the configuration. Further, not only the combination of the configurations explicitly described in the description of the respective embodiments but also the configurations of the plurality of embodiments can be partially combined with each other even if the combination is not specified unless any trouble occurs in the combination. And the combination which has not been specified between the configurations described in a plurality of embodiments and modifications is also disclosed by the following description.

First Embodiment
An electronic device 100 according to a first embodiment of the present disclosure shown in FIGS. 1 and 2 is a head-up display device (hereinafter, “HUD device”) mounted on a vehicle. The HUD device functions as an information presentation device, and provides the viewer with various information related to the vehicle by virtual image display. The electronic device 100 is provided with a shield structure that shields electromagnetic wave noise (hereinafter referred to as “noise”) emitted from the electric circuit unit 11 (described later). The shield structure is configured by the circuit board 10, the shield case 20, the plurality of clips 30, and the like.

  The circuit board 10 is configured of a printed wiring board, a large number of electronic components, and the like. The printed wiring board has an insulating base material such as resin or ceramic, and a wiring formed by a conductor pattern such as copper. Each electronic component is mounted on the printed wiring board in a state of being electrically connected to the conductor pattern. The circuit board 10 includes an electric circuit unit 11 and a ground circuit unit 15.

  The electric circuit unit 11 is at least a part of a processing circuit related to virtual image display by the HUD device. The electric circuit unit 11 includes, for example, an LED driver 12 and a DC converter 13. The LED driver 12 and the DC converter 13 are electronic components that become major noise generation sources when the HUD device operates.

  The ground circuit portion 15 is formed, for example, around the electric circuit portion 11 by a conductor pattern provided on the printed wiring board. The ground circuit unit 15 is formed to surround, for example, a rectangular shape around the electric circuit unit 11. The ground circuit unit 15 is electrically connected directly or indirectly to the vehicle body or the like, and can supply a ground potential.

  The shield case 20 shown in FIGS. 1 to 3 is formed in a box shape with a bottom by a conductive material such as metal. The shield case 20 has a flat rectangular parallelepiped shape as a whole and covers the electric circuit portion 11. The shield case 20 functions as an electromagnetic shield that reflects and attenuates the noise radiated from the electric circuit unit 11 and blocks most of the space conduction of the noise. The shield case 20 has a shielding wall 21 and a ceiling wall 28 formed in a thin plate shape.

  The shielding wall 21 has a plurality of (four) wall portions continuous with the ceiling wall 28. Each wall is bent relative to the ceiling wall 28 so as to be substantially perpendicular to the ceiling wall 28. The shielding wall 21 is shaped so as to surround the periphery of the electric circuit portion 11 by each wall portion. The shielding wall 21 is connected to the ground circuit unit 15 via a plurality of clips 30. With such a configuration, the current generated by the noise incident on the shielding wall 21 is dropped to the ground circuit unit 15. The shielding wall 21 has two perforated wall portions 22 and two non-perforated wall portions 25 as a plurality of wall portions. The perforated wall 22 and the non-porous wall 25 may not be joined to each other.

  The perforated wall 22 is a rectangular flat wall continuous with the short side of the ceiling wall 28. The two perforated wall portions 22 face each other in the long side direction of the ceiling wall 28. Each perforated wall portion 22 is provided with a pair of through holes 23. Each through hole 23 penetrates the perforated wall portion 22 in the thickness direction. The two through holes 23 form a pair of fitting holes 24 (see FIG. 7) on the inside and the outside of each perforated wall 22. The pair of fitting holes 24 are aligned along the longitudinal direction of the perforated wall 22. The two fitting holes 24 are provided at positions symmetrical with respect to a center line passing through the longitudinal center of the perforated wall 22. Each fitting hole portion 24 is formed in a long hole shape in which the longitudinal direction of the perforated wall portion 22 is a long side.

  The non-perforated wall 25 is a rectangular flat wall continuous with the long side of the ceiling wall 28. The two non-perforated wall portions 25 face each other in the short side direction of the ceiling wall 28. By such arrangement, the perforated wall 22 and the non-porous wall 25 are provided alternately around the electric circuit portion 11. In each non-perforated wall portion 25, a through hole 23 like the perforated wall portion 22 is not formed. Therefore, the whole of the non-porous wall portion 25 is a flat wall surface range 26 which is flat and flat.

  The ceiling wall 28 is a bottom wall of the shield case 20 and is formed in a rectangular flat plate shape. The ceiling wall 28 covers the upper side of the electric circuit portion 11 in a posture along the mounting surface of the circuit board 10. The four sides of the ceiling wall 28 are continuous with any one of the perforated wall 22 and the non-perforated wall 25. With such a configuration, the current generated by the noise incident on the ceiling wall 28 is dropped to the ground circuit unit 15 through the perforated wall 22 or the non-porous wall 25 and the clip 30.

  The clip 30 shown in FIGS. 1 and 4 to 6 is formed of a conductive and flexible metal material or the like. The clip 30 is mounted in a range overlapping with the ground circuit unit 15 (see FIG. 2) in the mounting surface. Each clip 30 is configured of one base portion 31 and a pair of holding structure portions 32 and the like. In the following description, the mounting side attached to the circuit board 10 is the lower side of the clip 30, and the inlet side into which each wall is inserted is the upper side of the clip 30.

  The base portion 31 is formed in a band shape as a whole. The base portion 31 is located below the clip 30 and is fixed to the mounting surface in a direction along the extension direction of the ground circuit portion 15. The lower surface of the base portion 31 is electrically connected to the conductive pattern of the ground circuit portion 15 (see FIG. 2). The base portion 31 is a portion connecting the two holding structures 32 and supports the holding structures 32 individually.

  The two holding structure parts 32 are provided spaced apart from each other in the arrangement in the extending direction of the base part 31. Each holding structure portion 32 has a pair of arm portions disposed opposite to each other in the width direction of the base portion 31. Each arm portion is provided with a convex portion 37. The convex portion 37 is formed in a shape projecting toward the shielding wall 21 in a convex shape. The holding structure portion 32 can hold the holding target by sandwiching the holding target (the shielding wall 21) inserted between the pair of arms with the two convex portions 37. For convenience, one of the pair of arms located outside the shielding wall 21 is referred to as an outer arm 33a, and the arm located inside the shielding wall 21 is referred to as an inner arm 33b.

  The outer arm portion 33a has a pair of side elastic portions 34a and a central elastic portion 35a. The both side elastic portion 34a and the center elastic portion 35a are elastically deformable in the direction away from the inner arm 33b, and press the convex portion 37 (hereinafter, "the outer convex portion 37a") against the outer surface of the shielding wall 21 by a restoring force. It functions as a pressing unit. The two elastic portions 34a are provided on both sides of the central elastic portion 35a. Each side elastic portion 34 a extends in a band shape from the side surface of the base portion 31 to the upper side of the clip 30. The central elastic portion 35a is supported by the both side elastic portions 34a disposed on both sides, and extends downward in a band shape from the support portion supported by the both side elastic portions 34a. An outer protrusion 37a is integrally formed on the central elastic portion 35a.

  The inner arm portion 33b has a pair of side elastic portions 34b and a central elastic portion 35b. The elastic portions 34b and the central elastic portion 35b are elastically deformable in the direction away from the outer arm 33a, and press the convex portion 37 (hereinafter, "the inner convex portion 37b") to the inner surface of the shielding wall 21 by a restoring force. It functions as a pressing unit. The two side elastic portions 34b are provided on both sides of the central elastic portion 35b. Each side elastic portion 34 b extends in a band shape from the side surface of the base portion 31 to the upper side of the clip 30. The central elastic portion 35 b is supported by the both side elastic portions 34 b disposed on both sides, and extends in a band shape downward from the support portion supported by the both side elastic portions 34 b. An inner convex portion 37b is integrally formed on the central elastic portion 35b.

  A plurality of (four) clips 30 are provided on the mounting surface of the circuit board 10 so as to be able to hold the wall portions of the shielding wall 21 respectively. Each clip 30 is arranged to hold the center of each wall.

  Two of the plurality of clips 30 are provided to hold the perforated wall 22. As shown in FIG. 8, the two clips 30 for holding the perforated wall 22 are formed on the perforated wall 22 by the pressing force of the elastic portions 34a and 34b and the central elastic portions 35a and 35b. Each protrusion 37 is fitted to each of the two fitting holes 24 from both the inner and outer sides. Each clip 30 locks the shielding wall 21 by an outer convex portion 37 a fitted to the through hole 23 from the outer side and an inner convex portion 37 b fitted to the through hole 23 from the inner side.

  Here, the detail of the fitting hole part 24 formed in the long hole shape is demonstrated based on FIG. The length dimension L and the width dimension w of the fitting hole 24 are both twice or more the thickness of the perforated wall 22. In addition, the length dimension L of the fitting hole portion 24 is larger than the width dimension a (see FIG. 5) of the convex portion 37 and equal to or less than twice the width dimension a. On the other hand, the width dimension w of the fitting hole portion 24 is not more than twice the height dimension h (see FIG. 6) of the convex portion 37. The height dimension h of the convex portion 37 is a distance along the vertical direction from the upper surface of the base portion 31 to the top 39 of the convex portion 37 (see FIG. 6). Convex part 37 fitted in fitting hole part 24 of the above-mentioned form forms conduction between shielding wall 21 and clip 30 by making a plurality of corner parts 38 contact inner skin of fitting hole part 24 Do.

  On the other hand, the other two of the plurality of clips 30 are provided to hold the non-perforated wall 25. As shown in FIG. 9, the two clips 30 are non-perforated walls in which the fitting holes 24 (see FIG. 8) are not formed by the pressing force of the both side elastic portions 34a and 34b and the central elastic portions 35a and 35b. The tops 39 of the convex portions 37 are in contact with both surfaces of the flat wall surface range 26 of the portion 25. Each of the clips 30 sandwiches the shielding wall 21 by the outer convex portion 37 a contacting the non-porous wall 25 from the outside and the inner convex 37 b contacting the non-porous wall 25 from the inner side. And the convex part 37 pressed on each flat wall surface range 26 forms conduction between the shielding wall 21 and the clip 30.

  In the first embodiment described so far, a part of the plurality of convex portions 37 is fitted in the fitting hole 24 formed in the perforated wall 22 and the strong holding of the shield case 20 by the clip 30 is possible. I have to. On the other hand, the other part of the plurality of projections 37 is in contact with the flat wall surface range 26 in which the fitting hole 24 is not formed. Therefore, even when the position of the shield case 20 deviates from the normal position with respect to the circuit board 10, the contact state between the convex portion 37 and the shielding wall 21 hardly changes. Therefore, even if the contact state of the corner portion 38 of the convex portion 37 locked in the fitting hole 24 changes due to the displacement of the position of the shield case 20, the change in the conduction performance as a whole can be suppressed.

  As described above, in the configuration in which the clip 30 for fitting the projection 37 to the fitting hole 24 and the clip 30 for not fitting the projection 37 to the fitting hole 24 are provided together, the position of the shield case 20 is Even if it is shifted, the conduction performance between the shielding wall 21 and the ground circuit unit 15 can be maintained. In addition, if some of the projections 37 are locked in the fitting holes 24, the holding force of the shield case 20 can be maintained high. Therefore, it is possible to achieve both of securing the holding force for holding the shield case 20 on the circuit board 10 and securing the conduction performance between the shield case 20 and the ground circuit portion 15.

  In addition, in the first embodiment, some displacement of the shield case 20 is acceptable. As a result, in the process of assembling the shield case 20 to the circuit board 10, it is not necessary to strictly control the position of the shield case 20. Therefore, reduction of the management cost at the time of manufacture of the electronic device 100 can be realized.

  Further, in the first embodiment, the perforated wall portion 22 and the non-perforated wall portion 25 are alternately provided around the electric circuit portion 11 as the shielding wall 21 that shields the noise. As described above, in the configuration in which the holding locations giving priority to securing the holding force and the holding locations that stabilize the conduction performance are alternately provided, the increase in the number of clips 30 is suppressed while the holding performance and the conduction performance are maintained. Securing can be achieved properly and properly.

  Further, as in the first embodiment, the flat rectangular shield case 20 can be held by the clips 30 even when rotated 180 ° along the circuit board 10. Thus, in the case where it is assumed that the shield case 20 is held by the clips 30 in a plurality of different directions, each fitting hole 24 is symmetrical with respect to the center line of the perforated wall 22. It is desirable to be placed. With such an arrangement of the fitting holes 24, the short side convexes 37 assumed to be fitted to the fitting holes 24 are different even if the direction of the shield case 20 is changed by 180 °. Fit into the fitting holes 24 of the Therefore, it is not necessary to strictly control the direction of the shield case 20. As a result, the management cost at the time of manufacturing the electronic device 100 can be further reduced.

  Furthermore, the clip 30 of the first embodiment is configured to clamp the shielding wall 21 from both the inner and outer sides. With the clip 30 having such a configuration, both the holding power and the conduction performance between the shield case 20 and the clip 30 can be further easily secured as compared with the configuration in which the convex portion is pressed against the shielding wall from one of the inner side and the outer side. .

  In addition, the fitting hole 24 of the first embodiment is formed by the through hole 23 penetrating the perforated wall 22. Therefore, the top of the projection 37 does not contact the bottom of the fitting hole 24. Therefore, the convex portion 37 fitted in the fitting hole 24 can be deeply pressed into the fitting hole 24 and the corner portion 38 can be strongly in contact with the fitting hole 24.

  In the first embodiment, the shield case 20 corresponds to the "case member", the perforated wall 22 corresponds to the "first wall", and the non-perforated wall 25 corresponds to the "second wall" Do. Furthermore, the flat wall surface range 26 corresponds to the "wall surface range", the clip 30 corresponds to the "holding member", and the outer arm 33a and the inner arm 33b correspond to the "arms".

Second Embodiment
The second embodiment of the present disclosure shown in FIGS. 10 and 11 is a modification of the first embodiment. The shield case 220 of the second embodiment is formed in a flat rectangular parallelepiped shape as in the first embodiment, and has a plurality of (four) wall portions 221 surrounding the periphery of the electric circuit portion 11 (see FIG. 2). Have. The shielding wall 21 of the second embodiment is formed by the four wall portions 221 and the like. One through hole 23 is formed in each wall portion 221. A pair of fitting holes 24 is provided on the inside and outside of each wall 221 by the through holes 23.

  Each of the clips 30 fits the convex portion 37 of one of the pair of holding structures 32 (hereinafter, “locking holding portion 132 a”) into the fitting hole portion 24 of each wall portion 221. The locking holding portion 132a locks the shielding wall 21 by the outer convex portion 37a fitted in the outer fitting hole 24 and the inner convex portion 37b fitted in the inner fitting hole 24 ( See Figure 8). In addition, each clip 30 presses and contacts the convex portion 37 of the other of the pair of holding structure portions 32 (hereinafter, referred to as “press holding portion 132 b”) to the flat wall surface range 26 on both surfaces of each wall portion 221. The pressing and holding portion 132b sandwiches the shielding wall 21 by the outer convex portion 37a contacting the flat wall surface range 26 from the outside and the inner convex portion 37b contacting the flat wall surface range 26 from the inside (see FIG. 9).

  In the above configuration, when the wall portion 221 is viewed from the outside from the outside, one of the two holding structure portions 32 located on the left side is the locking holding portion 132a and the other located on the right side is the pressing holding portion 132b Be done. That is, the fitting hole 24 is formed on the left side of the center line of each wall 221 along the height direction when the walls 221 are viewed from the outside from the outside. According to such a configuration, the convex portion 37 of the locking holding portion 132a assumed to be fitted to the fitting hole portion 24 is another wall portion 221 even when the direction of the shield case 220 is changed by 180 °. It fits in the provided fitting hole 24. Therefore, management of the direction of the shield case 220 is not necessary, and management cost can be reduced.

  Also in the second embodiment described above, the convex portion 37 of the locking holding portion 132a enables strong holding of the shield case 220 by the clip 30, while the convex portion 37 of the pressing and holding portion 132b changes the contact state. Fluctuation of conduction performance due to Therefore, in the second embodiment, the same effects as in the first embodiment can be obtained, and securing of the holding force for holding the shield case 220 on the circuit board 10, and between the shield case 220 and the ground circuit portion 15 (see FIG. 2) Coexistence with the securing of the conduction performance in

  In addition, as in the second embodiment, if one of the two holding structures 32 provided in one clip 30 is used as the locking holding part 132a and the other is used as the pressing holding part 132b, individual walls In the part 221, coexistence of ensuring of holding power and securing of energization performance becomes possible. Therefore, highly reliable holding of the shield case 220 and reduction of the noise level are realized while avoiding an increase in the number of clips 30.

  Furthermore, the clip 30 of the second embodiment has a configuration in which the locking and holding portion 132 a and the pressing and holding portion 132 b are connected by the base portion 31. With such a configuration, the locking and holding portion 132a and the pressing and holding portion 132b can perform an operation of pressing the respective convex portions 37 individually without affecting each other. Therefore, even if the convex portion 37 fitted in the fitting hole portion 24 and the convex portion 37 pressed in contact with the flat wall surface range 26 are provided in one clip 30, each convex portion 37 is the fitting hole portion 24. And the flat wall surface area 26 is properly in contact. In the second embodiment, the shield case 220 corresponds to a “case member”.

Third Embodiment
The third embodiment of the present disclosure shown in FIGS. 12 and 13 is another modification of the first embodiment. In the shield case 320 of the third embodiment, four wall portions 321 forming the shielding wall 21 by surrounding the periphery of the electric circuit portion 11 (see FIG. 2) are provided. In the third embodiment, two clips 30 are provided for one wall portion 321. Each wall portion 321 is formed with a pair of through holes 23. The fitting holes 24 similar to the perforated wall 22 (see FIG. 8) of the first embodiment are provided on the inside and the outside of each wall 321 by the through holes 23.

  One of the two clips 30 provided for the individual wall portions 321 is a locking clip 130 a for fitting the convex portions 37 of the two holding structures 32 into the fitting holes 24. The locking clip 130 a locks the shielding wall 21 by the outer convex portion 37 a fitted in the outer fitting hole 24 and the inner convex portion 37 b fitted in the inner fitting hole 24. (See Figure 8). On the other hand, the other of the two clips 30 is a pressing clip 130 b that presses the convex portions 37 of the two holding structure portions 32 into the flat wall surface range 26 on both surfaces of each wall portion 321. The pressing clip 130b sandwiches the shielding wall 21 by the outer convex portion 37a contacting the flat wall surface range 26 from the outside and the inner convex portion 37b contacting the flat wall surface area 26 from the inside (see FIG. 9).

  In the above configuration, when the wall portion 321 is viewed from the outside, one of the two clips 30 located on the left side is the locking clip 130 a, and the other located on the right side is the pressing clip 130 b. That is, the pair of fitting holes 24 is formed on the left side of the center line of each wall 321 along the height direction when the walls 321 are viewed from the outside from the outside. According to such a configuration, the convex portion 37 of the locking clip 130a assumed to be fitted in the fitting hole portion 24 is provided on another wall portion 321 even when the direction of the shield case 320 is changed by 180 °. It fits in the fitting hole part 24. Therefore, management of the direction of the shield case 320 is not necessary, and management cost can be reduced.

  Also in the third embodiment described so far, the convex portion 37 of the locking clip 130a enables strong holding of the shield case 320, while the convex portion 37 of the pressing clip 130b is conductive performance due to the change in the contact state. Control of the Therefore, also in the third embodiment, the same effects as in the first embodiment can be obtained, and securing of the holding force for holding the shield case 320 on the circuit board 10, and between the shield case 320 and the ground circuit portion 15 (see FIG. 2) Coexistence with the securing of the conduction performance in

  In addition, as in the third embodiment, in the configuration in which one of the two clips 30 provided on one side is used as the locking clip 130 a and the other as the pressing clip 130 b, the holding force is applied to each wall 321. These can be improved while making current carrying performance compatible. According to the above, highly reliable holding of the shield case 320 and further reduction of the noise level are possible. In the third embodiment, the shield case 320 corresponds to a "case member".

Fourth Embodiment
The fourth embodiment of the present disclosure shown in FIG. 14 is still another modification of the first embodiment. The shield case 460 of the electronic device 400 according to the fourth embodiment is configured by assembling a case frame 420, a cover member 440, and the like formed of a metal material with each other.

  The case frame 420 is fixed to the mounting surface of the circuit board 10. The case frame 420 is electrically connected to the ground circuit unit 15 (see FIG. 2). The case frame 420 has a rectangular frame-shaped shielding wall 421 that shields the noise radiated from the electric circuit unit 11 by the shape surrounding the periphery of the electric circuit unit 11 (see FIG. 2). The shielding wall 421 is configured by alternately arranging the perforated wall portion 22 in which the through holes 23 are formed and the non-perforated wall portion 25 which is entirely the flat wall surface range 26.

  The cover member 440 has a cover surface 441 that covers the case frame 420 and a plurality of holding arm portions 430. The holding arm portion 430 extends in a band shape from the cover surface portion 441 toward the circuit board 10. The holding arm portion 430 electrically connects the cover surface portion 441 and the shielding wall 421, and holds the cover surface portion 441 on the case frame 420. Each holding arm portion 430 has a convex portion 37 (see FIGS. 8 and 9) substantially the same as the clip 30 (see FIG. 6) of the first embodiment and a pressing portion 433 pressing the convex portion 37 against the shielding wall 421. Is formed. A part of the plurality of holding arm portions 430 has the convex portion 37 fitted in the fitting hole portion 24 formed in the shielding wall 421. On the other hand, the other part of the plurality of holding arm portions 430 presses and contacts the convex portion 37 with the flat wall surface range 26 in which the fitting hole portion 24 is not formed in the shielding wall 421.

  Also in the fourth embodiment described so far, some of the plurality of convex portions 37 are fitted in the fitting holes 24 of the shielding wall 421. Thus, the cover member 440 can be held firmly to the case frame 420. On the other hand, another part of the plurality of projections 37 is in contact with the flat wall surface range 26 of the shielding wall 421. Therefore, even when the position of the cover member 440 deviates from the normal position with respect to the case frame 420, the contact state between the convex portion 37 and the shielding wall 421 hardly changes. Thus, in the configuration in which the holding arm portion 430 for fitting the projection 37 to the fitting hole 24 and the holding arm 430 for not fitting the projection 37 to the fitting hole 24 are provided, the cover member 440 is provided. The conduction performance between the shielding wall 421 and the ground circuit unit 15 can be maintained even if the position of the sensor is misaligned. In addition, since some of the protrusions 37 are locked in the fitting holes 24, the holding force for holding the cover member 440 can be maintained high. Therefore, it is possible to achieve both the securing of the holding force for holding the cover member 440 to the case frame 420 and the securing of the conduction performance between the cover member 440 and the case frame 420. In the fourth embodiment, the case frame 420 corresponds to the “case member”, and the holding arm portion 430 corresponds to the “holding portion”.

(Other embodiments)
As mentioned above, although a plurality of embodiments of this indication were described, this indication is not interpreted by limiting to the above-mentioned embodiment, and it is applied to various embodiments and combination within the range which does not deviate from the gist of this indication. can do.

  Each clip of the first embodiment is provided at the center of each wall. However, there may be cases where the clip can not be placed at the center of all the walls due to the placement constraints of the elements mounted on the circuit board. Alternatively, according to the position of the LED driver and the DC converter which become noise sources in the electric circuit portion, a configuration in which the clip forming the conduction is located closer to the noise sources than the center of each wall can be adopted.

  In these cases, as in the first modification shown in FIG. 15, a set of wall portions in which the clip 30 can be disposed at the center is used as the perforated wall portion 22. On the other hand, a set of wall portions in which the clip 30 can not be disposed at the center is regarded as a non-porous wall portion 25 respectively. In the first modification as described above, the fitting holes 24 are arranged symmetrically with respect to the center line of the perforated wall 22. Therefore, regardless of the orientation of the shield case 520, the convex portion 37 (see FIG. 8) can be fitted in the fitting hole 24. As a result, the worker can carry out an operation of assembling the shield case 520 to each clip 30 without worrying about the direction of the shield case 520. Such a structure for preventing assembly failure can improve the workability.

  On the other hand, as in the second modification shown in FIG. 16, a set of wall portions in which the clip 30 can be disposed at the center may be used as the non-porous wall portion 25. That is, in the shielding wall 21 of the second modification, a set of wall portions in which the clip 30 can not be disposed at the center is set as the perforated wall portion 22. In the above configuration, when the shield case 620 is rotated 180 degrees from the normal direction, the fitting hole 24 does not fit in the convex portion. However, as long as specification of the direction of assembly of the shield case 620 is permitted, the fitting hole 24 may be provided in the wall portion in which the clip 30 is offset from the center. In the first and second modifications, the shield cases 520 and 620 correspond to “case members”, respectively.

  Furthermore, as in the first embodiment and the first and second modifications, the shielding wall may not have a configuration in which the perforated wall portion and the non-porous wall portion are alternately provided. For example, two adjacent walls may be the perforated wall 22 and the remaining two walls may be non-perforated walls. Furthermore, the number of perforated and non-perforated walls may not be equal. In the shielding wall, only one of the plurality of wall portions may be a perforated wall portion or a non-perforated wall portion.

  In the said embodiment, a pair of fitting hole was formed in the inside and outside of a wall by the penetration hole which penetrates a wall. However, for example, when the frequency of noise to be shielded is low and the shielding wall has a thick plate shape, the fitting hole portion is formed by a recess provided on the outer surface and the inner surface of each wall portion. May be Even in such a configuration, the retaining force of each clip can be secured by locking the protrusion to the fitting hole.

  The clip of the said embodiment was a structure which clamps a wall part from the inside and outside of a shielding wall. However, the clip may be configured to contact or lock the convex portion only to the outer wall surface of the inner and outer sides of the wall portion, or to contact or lock the convex portion only to the inner wall surface. It may be.

  In addition, the clip in the above embodiment has a configuration in which two holding structures are connected by one base. However, the holding structure provided on the clip may be one. That is, the clip may have a configuration in which the outer convex portion and the inner convex portion are pressed against each other by a pair of the outer arm portion and the inner arm portion, and only one of the outer arm portion and the inner arm portion May be

  The electronic device may be mounted on a movable body such as a ship other than a vehicle, an aircraft, and a transport device. Furthermore, the electronic device is not limited to the HUD device. The configuration of the present disclosure is applicable to various electronic devices that include both an electric circuit unit that is a noise source and a shield structure that shields noise.

DESCRIPTION OF SYMBOLS 10 Circuit board, 11 electric circuit part, 15 ground circuit part, 20, 220, 320, 520, 620 Shield case (case member), 21, 421 Shielding wall, 22 Perforated wall part (1st wall part), 23 penetration Hole, 24 fitting hole, 25 non-perforated wall (second wall), 26 flat wall area (wall area), 30 clip (holding member), 31 base, 221, 321 wall, 32 holding structure 33a outer arm (pressing portion) 33b inner arm (pressing portion) 37 convex portion 37a outer convex portion 37b inner convex portion 420 case frame (case member) 430 holding arm portion (holding portion) 433 pressing portion, 440 cover member, 441 cover surface portion, 100, 400 electronic device

Claims (9)

A circuit board (10) having an electric circuit portion (11) as a noise source and a ground circuit portion (15);
A case member (20, 220, 320, 520, 620) having a shielding wall (21) shaped to surround the electric circuit portion, and shielding noise emitted from the electric circuit portion by the shielding wall;
And a pressing portion (33a, 33b) for pressing the protrusion against the shielding wall, and the shielding wall and the ground circuit portion And a plurality of holding members (30) for holding the case member on the circuit board.
A part of the plurality of convex portions is fitted in the fitting hole portion (24) formed in the shielding wall by the pressing force of the pressing portion,
Another part of a plurality of said convex parts contacts the wall surface range (26) in which the said fitting hole part is not formed among the said shielding walls by the pressing force of the said press part. The shielding wall includes a first wall (22) in which the fitting hole is formed, and a second wall (25) which is the entire wall surface area,
The electronic device according to claim 1, wherein the first wall portion and the second wall portion are alternately provided around the electric circuit portion. The case member is assumed to be held by the holding member in a plurality of different orientations,
At least one of the plurality of convex portions assumed to be fitted to the fitting hole is fitted to the fitting hole even when the direction of the case member is changed. Or the electronic device as described in 2. The holding member is provided with a pair of holding structure portions (32) having the convex portion and the pressing portion,
One of the convex portions of the pair of holding structure parts is fitted in the fitting hole portion,
The electronic device according to claim 1, wherein the other convex portion of the pair of holding structure parts contacts the wall surface range.   The electronic device according to claim 4, wherein the holding member further supports a base portion (31) which individually supports the pressing portions of the holding structures and which is connected to the circuit board. The shielding wall includes a plurality of walls (321) surrounding the periphery of the electric circuit portion,
The said holding member which makes the said convex part fit in the said fitting hole part, and the said holding member which makes the said convex part contact the said wall surface range are provided with respect to each said each wall part. Electronic device described.   The holding member has an outer convex portion (37a) in contact with the shielding wall from the outer side, and an inner convex portion (37b) in contact with the shielding wall from the inner side as the convex portion. The electronic device according to any one of claims 1 to 6, wherein the shielding wall is held by an inner convex portion.   The electronic device according to any one of claims 1 to 7, wherein the fitting hole portion is formed by a through hole (23) which penetrates the shielding wall in a thickness direction. A circuit board (10) having an electric circuit portion (11) as a noise source and a ground circuit portion (15);
A case member (420) having a shielding wall (421) for shielding noise radiated from the electric circuit unit by the shape surrounding the electric circuit unit, and electrically connected to the ground circuit unit;
A cover surface (441) covering the case member, and a cover member (440) having a plurality of holding portions (430) for electrically connecting the cover surface and the shielding wall and holding the cover surface on the case member; Equipped with
The holding portion is formed with a convex portion (37) having a shape protruding in a convex shape toward the shielding wall, and a pressing portion (433) which presses the convex portion against the shielding wall.
A part of the plurality of convex portions is fitted in the fitting hole portion (24) formed in the shielding wall by the pressing force of the pressing portion,
Another part of a plurality of said convex parts contacts the wall surface range (26) in which the said fitting hole part is not formed among the said shielding walls by the pressing force of the said press part.

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