Electronic devices

Abstract

To provide a shielding case that can contribute to the miniaturization of electronic devices, and an electronic device using the same. [Solution] The electronic device 10 includes an internal component 32 mounted on a mounting substrate 20 so as to be located within a predetermined region 22, and a straddle component 34 mounted on the mounting substrate 20 so as to straddle the boundary line 221 between the inside and outside of the predetermined region 22. The shield case 40 is mounted on the mounting substrate 20 such that the side wall portion 44 is located on the boundary line 221. The side wall portion 44 has an intermediate wall portion 441. The intermediate wall portion 441 does not reach the lower end of the shield case 40, and below the intermediate wall portion 441, an opening 48 is formed that connects the inside and outside of the shield case 40. The straddle component 34 is partially located within the opening 48 directly below the intermediate wall portion 441. The lower end of the intermediate wall portion 441 is located below the upper end of the tallest internal component 32 among the internal components 32.

Description

Technical Field

[0001] The present invention relates to an electronic device, and particularly to an electronic device provided with a shield case.

Background Art

[0002] Patent Document 1 discloses an electronic device having a configuration in which a plurality of electronic components mounted on a mounting substrate are covered with a cap (shield case).

[0003] As shown in FIG. 8, the electronic device 80 disclosed in Patent Document 1 includes a mounting substrate 801, a plurality of electronic components 803 mounted on the mounting substrate 801, and a cap (shield case) 805 attached to the mounting substrate 801 so as to cover the electronic components 803.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The cap (shield case) 805 of the electronic device 80 disclosed in Patent Document 1 has a problem that it tends to cause the electronic device 80 to be enlarged.

[0006] An object of the present invention is to provide a shield case that can contribute to miniaturization of an electronic device and an electronic device using the same.

Means for Solving the Problems

[0007] As a first electronic device, the present invention is an electronic device including a mounting substrate, a plurality of elements, and a shield case, the mounting substrate has a predetermined region, Each of the aforementioned plurality of elements is an electronic component or an electrical component. The plurality of elements include at least one internal component mounted on the mounting substrate so as to be located within the predetermined region, and at least one straddle component mounted on the mounting substrate so as to straddle the boundary line between the inside and outside of the predetermined region. The shield case has a top surface and a side wall extending downward from the top surface. When the shield case is viewed from above, the shield case is mounted on the substrate such that the side wall portion is located on the boundary line between the inside and outside of the predetermined area. The side wall portion has a full wall portion that extends to the lower end of the shield case and an intermediate wall portion that extends downward by a predetermined distance from the top surface portion. The intermediate wall portion does not reach the lower end of the shield case, and an opening is formed below the intermediate wall portion that connects the inside and outside of the shield case. The straddling component is partially located within the opening directly below the intermediate wall portion. The lower end of the intermediate wall portion is located below the upper end of the tallest of the at least one internal component in the vertical direction. We provide electronic devices.

[0008] Furthermore, the present invention provides a second electronic device, which is the first electronic device, The aforementioned shield case has a polygonal cylindrical shape, The aforementioned side wall portion has multiple sides, The aforementioned plurality of sides include a specific side having the intermediate wall portion and a plurality of normal sides other than the specified side. The aforementioned specific side surface is provided with the aforementioned opening. Each of the aforementioned normal sides has a connection portion that is connected to the mounting board. In at least one of the normal sides, the sum of the horizontal lengths of the connecting portions is shorter than the horizontal length of that normal side. We provide electronic devices.

[0009] Furthermore, the present invention provides a first shield case, which is mounted on a mounting substrate having a predetermined region and covers an element arranged on the predetermined region, The shield case has a top surface and a side wall extending downward from the top surface. The shield case is mounted on the substrate such that, when viewed from above during use, the side wall portion is located on the boundary line between the inside and outside of the predetermined area. The side wall portion has a full wall portion that extends to the lower end of the shield case and an intermediate wall portion that extends downward by a predetermined distance from the top surface portion. The intermediate wall portion does not reach the lower end of the shield case, and an opening is formed below the intermediate wall portion that connects the inside and outside of the shield case. The opening allows the element to be mounted on the mounting substrate so as to straddle the boundary line between the inside and outside of the predetermined area of ​​the mounting substrate. We provide a shield case. [Effects of the Invention]

[0010] One aspect of the present invention, a shielding case, allows elements to be mounted on a mounting board so as to straddle the boundary line between the inside and outside of a predetermined area of ​​the mounting board, through an opening formed below the intermediate wall. With this configuration, elements that have a high correlation with elements that may be noise sources can be placed near those elements, thereby shortening the wiring length. Moreover, since it is not necessary to cover all of these elements together with the shielding case, the shielding case can also be miniaturized. Thus, one aspect of the present invention, a shielding case, can shorten the wiring length on the mounting board and miniaturize the shielding case, thereby enabling miniaturization of electronic devices. Furthermore, miniaturization of electronic devices can lead to cost reductions, including material costs and mounting processing costs. In addition, shortening the wiring length on the mounting board can lead to increased efficiency of electronic devices and reduced electromagnetic noise radiation. [Brief explanation of the drawing]

[0011] [Figure 1] It is a perspective view showing an electronic device according to an embodiment of the present invention. [Figure 2] It is a perspective view showing a shield case included in the electronic device of FIG. 1. [Figure 3] It is a plan view showing the electronic device of FIG. 1. [Figure 4] It is a plan view showing a mounting substrate and elements included in the electronic device of FIG. 3. A boundary line representing a predetermined area of the mounting substrate is shown by a two-dot chain line. [Figure 5] It is a plan view showing the electronic device of FIG. 3. The inner surface of the shield case, the elements covered by the shield case, and the ground pattern are shown by broken lines. [Figure 6] It is a cross-sectional view taken along line A-A showing the electronic device of FIG. 5. [Figure 7] It is a cross-sectional view taken along line B-B showing the electronic device of FIG. 5. [Figure 8] It is a cross-sectional view showing the electronic device described in Patent Document 1.

Embodiments for Carrying Out the Invention

[0012] Referring to FIG. 1, an electronic device 10 according to the present embodiment includes a mounting substrate 20, a plurality of elements 30, and a shield case 40. The elements 30 and the shield case 40 are mounted on the upper surface of the mounting substrate 20. In the present embodiment, the vertical direction is the Z direction. The +Z direction is upward and the -Z direction is downward.

[0013] As shown in FIG. 4, the mounting substrate 20 has a predetermined area 22 on its upper surface. In the present embodiment, the predetermined area 22 is an area where the elements 30 to be covered by the shield case 40 are mounted. Also, in the present embodiment, a plurality of ground patterns 24 are formed on the boundary line 221 between the predetermined area 22 and its periphery. In the present embodiment, the shape of the predetermined area 22 is rectangular. However, in the present invention, the shape of the predetermined area 22 is not particularly limited and may be circular, polygonal, racetrack-shaped, or the like.

[0014] As can be seen from Figures 3 and 4, the plurality of elements 30 include at least one intrinsic component 32 mounted on the mounting substrate 20 so as to be located within a predetermined region 22. In this embodiment, there are three intrinsic components 32. Each of the intrinsic components 32 is an element 30 that may be a noise source or an element 30 that should be placed near an element 30 that may be a noise source. In this embodiment, each of the plurality of elements 30 is an electronic component or an electrical component. Electrical components include, for example, inductors.

[0015] As can be seen from Figures 3 and 4, the plurality of elements 30 include at least one straddle component 34 mounted on the mounting substrate 20 so as to straddle the boundary line 221 between the inside and outside of a predetermined region 22. In this embodiment, there are two straddle components 34. Each of the straddle components 34 is an element 30 that should be placed near an element 30 that may be a noise source.

[0016] As shown in Figure 3 or Figure 4, in the present invention, the plurality of elements 30 may include at least one external component 36 mounted on the mounting substrate 20 so as to be located outside the predetermined region 22. In this embodiment, the plurality of elements 30 includes two external components 36.

[0017] Referring to Figure 2, the shield case 40 has a top surface portion 42 and a side wall portion 44 extending downward from the top surface portion 42. The shield case 40 is mounted on a mounting substrate 20 (see Figure 4) having a predetermined region 22 (see Figure 4) and is intended to cover the element 30, i.e., the internal component 32 (see Figure 4), which is arranged on the predetermined region 22. The shield case 40 can be formed, for example, by bending sheet metal. The shield case 40 may also be formed by drawing sheet metal.

[0018] As shown in Figure 2, in this embodiment, the shape of the shield case 40 is generally a low-profile polygonal cylinder. More specifically, the shield case 40 is a rectangular cylinder with one end closed. In this embodiment, the shape of the top surface 42 is rectangular when viewed from above. However, the present invention is not limited thereto. The shape of the top surface 42 only needs to correspond to the shape of the predetermined region 22, and may be circular, polygonal, or racetrack-shaped.

[0019] As can be seen from Figures 2 and 5, the side wall portion 44 has a plurality of sides 46 (461-464). In this embodiment, there are four sides 46. Also in this embodiment, the sides 46 are separated from each other. However, the present invention is not limited thereto. In the present invention, the number of sides 46 can be determined based on the shape of the top surface portion 42. For example, the side wall portion 44 may have a single cylindrical side 46. Alternatively, the plurality of sides 46 may be continuous with each other in a polygonal tubular shape.

[0020] As can be seen from Figures 6 and 7, the side surface 461 constitutes an intermediate wall portion 441 that extends downward by a predetermined distance from the top surface portion 42 and does not reach the lower end of the shield case 40. The predetermined distance will be described later. Thus, the side wall portion 44 has an intermediate wall portion 441, and the side surface 461 is a specific side surface 461 having an intermediate wall portion 441. However, the present invention is not limited thereto. The intermediate wall portion 441 may be provided on a part of the side surface 461. In any case, the multiple side surfaces 46 include a specific side surface 461 having an intermediate wall portion 441.

[0021] As can be seen from Figures 2, 6, and 7, each of the sides 462, 463, and 464 has a portion that extends downward from the top surface 42 and reaches the lower end of the shield case 40, i.e., a full wall portion 443. Thus, the side wall portion 44 has a full wall portion 443, and each of the sides 462, 463, and 464 is a normal side portion 462, 463, and 464 that does not have an intermediate wall portion 441. However, the present invention is not limited thereto. Each of the sides 462, 463, and 464 may collectively constitute a full wall portion 443. In any case, the multiple sides 46 include multiple normal sides 462, 463, and 464 other than the specific side portion 461.

[0022] As can be seen from Figures 6 and 7, an opening 48 is formed below a specific side 461, connecting the inside and outside of the shield case 40. If an intermediate wall 441 is provided on a part of the side 461, the opening 48 is formed below that intermediate wall 441. In any case, the opening 48 is provided on a specific side 461.

[0023] As can be seen from Figures 4 and 5, the shield case 40 is mounted on the mounting substrate 20 such that, when viewed from above, the side wall portion 44 is located on the boundary line 221 between the inside and outside of the predetermined region 22. The straddle component 34 is mounted on the mounting substrate 20 so that it is located on the boundary line 221 between the inside and outside of the predetermined region 22. With the shield case 40 mounted on the mounting substrate 20, the straddle component 34 is mounted on the mounting substrate 20 so that it passes through the opening 48 directly below the intermediate wall portion 441 and is located both inside and outside the opening 48. In other words, the opening 48 allows the element 30 to be mounted on the mounting substrate 20 so as to straddle the boundary line 221 between the inside and outside of the predetermined region 22 of the mounting substrate 20. In this embodiment, the straddle component 34 extends from both sides of the opening 48 in the thickness direction of the intermediate wall portion 441, but the present invention is not limited thereto. In the present invention, the straddle component 34 may extend from the opening 48 to only one side in the thickness direction of the intermediate wall portion 441. In any case, the straddle component 34 only needs to be partially located within the opening 48 directly below the intermediate wall portion 441.

[0024] As can be seen from Figures 1 and 2, the shield case 40 has connection parts 445 that are connected to the grounding pattern 24 on the mounting substrate 20. Specifically, each of the usual sides 462, 463, and 464 has two connection parts 445. These connection parts 445 correspond to the entire wall portion 443, respectively. In the horizontal direction perpendicular to the vertical direction, the connection parts 445 are located at both ends of each of the sides 462, 463, and 464. In this embodiment, the horizontal direction is the X direction or the Y direction, and is the longitudinal direction of each of the sides 462, 463, and 464. Specifically, with respect to sides 462 and 464, the horizontal direction is the X direction, and with respect to side 463, the horizontal direction is the Y direction.

[0025] As can be seen from Figures 1 and 2, in this embodiment, the sum of the lengths of the horizontal connection portions 445 is usually shorter than the sum of the lengths of the sides 462, 463, and 464. This is to minimize the stress generated in the solder (not shown) connecting the connection portions 445 and the grounding pattern 24 due to temperature changes. The sum of the lengths of the connection portions 445 is preferably shorter, as long as the desired connection strength is obtained and the electromagnetic noise shielding effect is not degraded.

[0026] As can be seen from Figures 6 and 7, the lower end of the specific side 461 or the intermediate wall portion 441 is located below the upper end of the tallest internal component 32 in the vertical direction. Also, the lower end of the intermediate wall portion 441 is located above the tallest straddling component 34 in the vertical direction. The predetermined distance of the intermediate wall portion 441 is thus determined based on the height of the internal component 32 and the height of the straddling component 34. With this configuration, the shield case 40 can obtain an electromagnetic noise shielding effect equivalent to that of completely covering the internal component 32. However, if there is an internal component 32 that is taller than the internal component 32 that is the noise source, it is preferable that the lower end of the specific side 461 or the intermediate wall portion 441 is located below the upper end of the internal component 32 that is the noise source.

[0027] As described above, in this embodiment, the electronic device 10 has an opening 48 in the shield case 40, allowing the elements 30 to be mounted on the mounting substrate 20 so as to straddle the boundary line 221 between the inside and outside of a predetermined area 22 on the mounting substrate 20. In other words, the electronic device 10 in this embodiment has improved design flexibility for the mounting substrate 20. This allows for a reduction in the distance between elements 30 and the wiring length, as well as a miniaturization of the shield case 40, thereby achieving miniaturization of the electronic device 10. Furthermore, the miniaturization of the electronic device 10 leads to a reduction in costs, including material costs and mounting processing costs. In addition, the reduction in the wiring length on the mounting substrate 20 enables higher efficiency of the electronic device 10 and a reduction in electromagnetic noise radiation.

[0028] The present invention has been described above with reference to embodiments, but the present invention is not limited to the embodiments described above, and various modifications and changes are possible without departing from the spirit of the present invention. For example, in the above embodiment, there was one intermediate wall portion 441, but there may be multiple intermediate wall portions 441. Multiple intermediate wall portions 441 may be provided on one side surface 46, or one may be provided on each of multiple side surfaces 46. However, configuring one intermediate wall portion 441 on one side surface 46 as in the embodiment is simpler in structure and easier to manufacture. [Explanation of Symbols]

[0029] 10 Electronic equipment 20 Implemented circuit boards 22 Predetermined area 221 Boundary Line 24 Grounding Patterns 30 elements 32 Internal components 34 Straddling parts 36 External parts 40 Shield Cases 42 Top section 44 Side wall section 441 Midway wall section 443 Entire wall section 445 Connection part 46 Side view 461 Side view (specific side view) 462, 463, 464 Side view (usual side view) 48 Opening

Claims

1. An electronic device comprising a mounting board, a plurality of elements, and a shielding case, The aforementioned mounting substrate has a predetermined region, Each of the aforementioned plurality of elements is an electronic component or an electrical component. The plurality of elements include at least one internal component mounted on the mounting substrate so as to be located within the predetermined region, and at least one straddle component mounted on the mounting substrate so as to straddle the boundary line between the inside and outside of the predetermined region. The shield case has a top surface and a side wall extending downward from the top surface. When the shield case is viewed from above, the shield case is mounted on the substrate such that the side wall portion is located on the boundary line between the inside and outside of the predetermined area. The side wall portion has a full wall portion that extends to the lower end of the shield case and an intermediate wall portion that extends downward by a predetermined distance from the top surface portion. The intermediate wall portion does not reach the lower end of the shield case, and an opening is formed below the intermediate wall portion that connects the inside and outside of the shield case. The straddling component is partially located within the opening directly below the intermediate wall portion. The lower end of the intermediate wall portion is located below the upper end of the tallest of the at least one internal component in the vertical direction. electronic equipment.

2. The electronic device according to claim 1, The aforementioned shield case has a polygonal cylindrical shape, The aforementioned side wall portion has multiple sides, The aforementioned plurality of sides include a specific side having the intermediate wall portion and a plurality of normal sides other than the specified side. The aforementioned specific side surface is provided with the aforementioned opening. Each of the aforementioned normal sides has a connection portion that is connected to the mounting board. In at least one of the normal sides, the sum of the horizontal lengths of the connecting portions is shorter than the horizontal length of that normal side. electronic equipment.

3. A shield case for covering an element placed on a mounting substrate having a predetermined region, wherein the shield case is mounted on the predetermined region. The shield case has a top surface and a side wall extending downward from the top surface. The shield case is mounted on the substrate such that, when viewed from above during use, the side wall portion is located on the boundary line between the inside and outside of the predetermined area. The side wall portion has a full wall portion that extends to the lower end of the shield case and an intermediate wall portion that extends downward by a predetermined distance from the top surface portion. The intermediate wall portion does not reach the lower end of the shield case, and an opening is formed below the intermediate wall portion that connects the inside and outside of the shield case. The opening allows the element to be mounted on the mounting substrate so as to straddle the boundary line between the inside and outside of the predetermined area of ​​the mounting substrate. Shield case.

Images