Substrate support structure

Abstract

To provide a substrate support structure that supports a substrate and can reduce vibrations of the substrate.SOLUTION: In a substrate support structure 10, an elastic body 24 is provided between a substrate 12 and a housing member 22. The elastic body 24 is connected to the housing member 22 between a first position fixing portion 221 and a second position fixing portion 222 of the housing member 22, and is connected to the substrate 12 between a first supported portion 121 and a second supported portion 122 of the substrate 12. The substrate 12 and the housing member 22 together form a substrate composite 30. The substrate composite 30 generates resonance due to the inclusion of the housing member 22, and resonance due to the inclusion of the substrate 12. Furthermore, a first resonance frequency, which occurs when the substrate composite 30 resonates due to the inclusion of the housing member 22, is lower than a second resonance frequency, which occurs when the substrate composite 30 resonates due to the inclusion of the substrate 12.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a substrate support structure for supporting a substrate. [Background technology]

[0002] Patent Document 1 describes a substrate fixing structure that fastens and fixes a substrate to a housing member. The substrate fixing structure of Patent Document 1 includes a housing member and a substrate. The mounting surface formed on the substrate side of the housing member and to which the substrate is attached is provided with a plurality of bosses that protrude from the mounting surface and are located at the four corners of the mounting surface, and a boss that protrudes from the mounting surface lower than the bosses at the four corners and is located at the center of the mounting surface. The substrate is then fastened to the end face of the central boss. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2015-23087 A Summary of the Invention [Problem to be solved by the invention]

[0004] The substrate fixing structure disclosed in Patent Document 1 is considered to be effective as one technique for suppressing vibration of the substrate.

[0005] However, various constraints on the structure supporting the substrate are expected, and there may be cases where the substrate fixing structure of Patent Document 1 cannot be adopted. Therefore, it was considered necessary to develop a technology for supporting the substrate and suppressing vibration of the substrate in a manner different from the substrate fixing structure of Patent Document 1. The inventors conducted detailed studies and found the above.

[0006] In view of the above, an object of the present disclosure is to provide a substrate support structure that supports a substrate with a structure different from that of Patent Document 1 and is capable of suppressing vibration of the substrate. [Means for solving the problem]

[0007] In order to achieve the above object, a substrate support structure according to one aspect of the present disclosure comprises: a substrate (12, 13) having a first supported portion (121) and a second supported portion (122) disposed away from the first supported portion, the substrate (12, 13) being supported by the first supported portion and the second supported portion, a substrate juxtaposition section (12, 13, 22, 33) disposed on one side of the substrate in a thickness direction (Dt) of the substrate, the substrate juxtaposition section having a first position fixing section (221) and a second position fixing section (222) disposed apart from each other and fixed in position with respect to the first supported section and the second supported section, the substrate juxtaposition section being supported by the first position fixing section and the second position fixing section, an elastic body (24) provided between the substrate and the substrate-juxtaposed portion, elastically deformable in a thickness direction, joined to the substrate-juxtaposed portion between the first position fixing portion and the second position fixing portion, and joined to the substrate between the first supported portion and the second supported portion; The substrate and the substrate juxtaposition portion constitute a substrate composite body (30); The elastic body is in a compressed state in which it is elastically compressed in the thickness direction when the substrate composite is in a stationary state and not vibrating, the substrate composite generates resonance due to the inclusion of the substrate juxtaposed portion and resonance due to the inclusion of the substrate, One resonant frequency (FQ1) at which the substrate composite resonates due to the inclusion of the substrate juxtaposition portion is lower than the other resonant frequency (FQ2) at which the substrate composite resonates due to the inclusion of a substrate.

[0008] In this way, by utilizing the mechanism in which the phase of vibration of the substrate-applied portion is inverted before and after the one resonant frequency, the vibration of the substrate during resonance at the other resonant frequency can be suppressed by the substrate-applied portion. Therefore, it is possible to support the substrate with a structure different from that of Patent Document 1 and suppress the vibration of the substrate.

[0009] In addition, in each section of the application documents, each element may be given a reference number in parentheses. In this case, the reference number merely indicates an example of the correspondence between the element and the specific configuration described in the embodiment described later. Therefore, the present disclosure is not limited in any way by the description of the reference number. [Brief description of the drawings]

[0010] [Figure 1] FIG. 2 is a front view showing a schematic configuration of the substrate support structure in the first embodiment. [Diagram 2] FIG. 2 is an exploded perspective view showing the substrate support structure of the first embodiment, in which a substrate, a housing member, an elastic body, and a spacer are selectively shown from the substrate support structure. [Diagram 3] This is a front view showing a schematic configuration of a substrate support structure of a comparative example, in other words, a front view showing a substrate support structure of the first embodiment in a virtual independent vibration state, and corresponds to Figure 1. [Figure 4] 4 is a front view showing, in an exaggerated manner, a schematic state of bending of a housing member and a substrate in a first resonance mode. FIG. [Diagram 5] 11 is a front view showing, in an exaggerated manner, a schematic state of bending of the housing member and the substrate in the second resonance mode. FIG. [Figure 6] FIG. 4 is a diagram showing the relationship between the acceleration amplitude occurring at a predetermined position on the substrate in each of the first and second resonance modes and the Young's modulus of the elastic body in the first embodiment. [Figure 7] FIG. 4 is a diagram showing a frequency response of the acceleration amplitude at a predetermined position on the substrate in the first embodiment. [Figure 8] FIG. 8 is a diagram showing a frequency response of the displacement amplitude at a predetermined position on the substrate in the second embodiment, and corresponds to FIG. 7. [Figure 9] FIG. 13 is an exploded perspective view showing a substrate support structure according to a third embodiment, in which a substrate, a housing member, and an elastic body are selectively shown from the substrate support structure. [Figure 10]FIG. 10 is an exploded perspective view showing a substrate, a housing member, and an elastic body extracted from the substrate support structure in the fourth embodiment, and showing the substrate support structure in an exploded state, the view corresponding to FIG. [Figure 11] FIG. 11 is an exploded perspective view showing a substrate, a housing member, and an elastic body extracted from the substrate support structure in the fifth embodiment, and showing the substrate support structure in an exploded state, the view corresponding to FIG. [Figure 12] FIG. 13 is an exploded perspective view showing a substrate, a housing member, and an elastic body extracted from the substrate support structure in the sixth embodiment, and showing the substrate support structure in an exploded state, the view corresponding to FIG. [Figure 13] FIG. 13 is an exploded perspective view showing the first substrate, the second substrate, the housing member, and the elastic body of the substrate support structure in the seventh embodiment, and showing the substrate support structure in an exploded state, the view corresponding to FIG. 9. [Figure 14] FIG. 13 is an exploded perspective view showing the first substrate, the second substrate, the housing member, and two elastic bodies of the substrate support structure in the eighth embodiment, and shows the substrate support structure in an exploded state, and corresponds to FIG. 9. [Figure 15] FIG. 13 is a front view showing a schematic configuration of a substrate support structure in a ninth embodiment, the view corresponding to FIG. [Figure 16] FIG. 13 is an exploded perspective view showing a substrate, a housing member, and two elastic bodies selected from the substrate support structure in the ninth embodiment, and showing the substrate support structure in an exploded state, the view corresponding to FIG. [Figure 17] FIG. 23 is a front view showing a schematic configuration of a substrate support structure in a tenth embodiment, the view corresponding to FIG. [Figure 18] FIG. 23 is an exploded perspective view showing a substrate, a housing member, and an elastic body extracted from the substrate support structure in the tenth embodiment, and showing the substrate support structure in an exploded state, the view corresponding to FIG. [Figure 19] FIG. 12 is an exploded perspective view showing a substrate, a housing member, and an elastic body extracted from the substrate support structure in the eleventh embodiment, and shows the substrate support structure in an exploded state, the view corresponding to FIG. [Figure 20] FIG. 23 is an exploded perspective view showing a substrate, a housing member, and an elastic body selected from the substrate support structure in the twelfth embodiment, and showing the substrate support structure in an exploded state, the view corresponding to FIG. [Figure 21] FIG. 23 is an exploded perspective view showing a substrate, a housing member, and an elastic body selected from the substrate support structure in the thirteenth embodiment, and showing the substrate support structure in an exploded state, the view corresponding to FIG. [Figure 22] FIG. 23 is a cross-sectional view showing a schematic configuration of a substrate support structure in a fourteenth embodiment. [Diagram 23] FIG. 23 is a cross-sectional view that typically shows a schematic configuration of a substrate support structure in the fifteenth embodiment, and corresponds to FIG. 22. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, each embodiment will be described with reference to the drawings. In the following embodiments, the same reference numerals are given to parts that are the same or equivalent to each other.

[0012] (First embodiment) 1 and 2, a substrate support structure 10 of this embodiment includes a substrate 12 and is configured to support the substrate 12 and suppress vibration of the substrate 12. In addition to the substrate 12, the substrate support structure 10 includes a substrate mounting member 20, a housing member 22, a plurality of elastic bodies 24, a plurality of mounting pedestals 26, a plurality of spacers 28, and the like.

[0013] The substrate 12 has a flat plate shape having a thickness in a substrate thickness direction Dt. When viewed in the substrate thickness direction Dt, the substrate 12 has a rectangular shape. The substrate 12 is a printed circuit board on which an electric circuit pattern is formed using copper foil or the like.

[0014] For example, the substrate support structure 10 of this embodiment constitutes a part of a device (such as a PCU or ECU) mounted on a vehicle, and a plurality of electronic components are mounted and fixed on the surface of the substrate 12. PCU is an abbreviation for "Power Control Unit," and ECU is an abbreviation for "Electronic Control Unit."

[0015] In the description of this embodiment, a direction perpendicular to the substrate thickness direction Dt and coinciding with the longitudinal direction of the substrate 12 is referred to as a first direction D1, and a direction perpendicular to the first direction D1 and the substrate thickness direction Dt is referred to as a second direction D2. The upper side of the paper in Fig. 1 is referred to as one side of the substrate thickness direction Dt, and the lower side of the paper in Fig. 1 is referred to as the other side of the substrate thickness direction Dt. The other side of the substrate thickness direction Dt means the side opposite to one side of the substrate thickness direction Dt.

[0016] Furthermore, the substrate 12 has a pair of first supported parts 121 arranged on one side in the first direction D1, and a pair of second supported parts 122 arranged on the other side opposite to the one side in the first direction D1. That is, the pair of second supported parts 122 are arranged apart from the pair of first supported parts 121 in the first direction D1. The pair of first supported parts 121 are arranged apart from each other in the second direction D2, and the pair of second supported parts 122 are also arranged apart from each other in the second direction D2.

[0017] The substrate 12 is fixed to and supported by the substrate mounting member 20 at its first and second supported portions 121, 122. In short, the substrate 12 is fixed to and supported by the substrate mounting member 20 at its four corners.

[0018] The substrate mounting member 20 and the housing member 22 each constitute a part of a housing (not shown) that houses, for example, the substrate 12. For example, the thickness of the substrate mounting member 20 is much greater than the thickness of the substrate 12, and the substrate mounting member 20 is configured to have much higher bending rigidity than the substrate 12. In other words, the substrate mounting member 20 is a member that becomes the base on which the substrate 12 is placed.

[0019] The substrate mounting member 20 is disposed on the other side of the substrate 12 in the substrate thickness direction Dt with a gap therebetween. The substrate 12 is fixed to the substrate mounting member 20 at the first and second supported portions 121, 122, respectively, with a mounting base 26 sandwiched between the substrate 12 and the substrate mounting member 20. Therefore, even if the substrate 12 vibrates and bends in the substrate thickness direction Dt, it will not come into contact with the substrate mounting member 20.

[0020] The number of mounting bases 26 provided between the substrate 12 and the substrate mounting member 20 is equal to the total number of the first and second supported portions 121, 122, that is, four in this embodiment. The mounting bases 26 are, for example, washers.

[0021] The housing member 22 has a flat plate shape having a thickness in the substrate thickness direction Dt, and is disposed so as to overlap one side of the substrate 12 in the substrate thickness direction Dt with a gap therebetween. When viewed in the substrate thickness direction Dt, the housing member 22 has a rectangular shape. That is, the housing member 22 is a substrate juxtaposed portion disposed alongside the substrate 12 in a parallel orientation.

[0022] Furthermore, the housing member 22 has a pair of first position fixing parts 221 arranged on one side in the first direction D1, and a pair of second position fixing parts 222 arranged on the other side in the first direction D1. That is, the pair of second position fixing parts 222 are arranged apart from the pair of first position fixing parts 221 in the first direction D1. The pair of first position fixing parts 221 are arranged apart from each other in the second direction D2, and the pair of second position fixing parts 222 are also arranged apart from each other in the second direction D2.

[0023] The pair of first position fixing parts 221 of the housing member 22 are provided so as to overlap one side of the pair of first supported parts 121 of the substrate 12 in the substrate thickness direction Dt. The pair of first position fixing parts 221 are fixed to the pair of first supported parts 121 with a spacer 28 sandwiched between the pair of first supported parts 121 and the pair of first supported parts 121.

[0024] Similarly, the pair of second position fixing parts 222 of the housing member 22 are provided so as to overlap one side of the pair of second supported parts 122 of the substrate 12 in the substrate thickness direction Dt. The pair of second position fixing parts 222 are fixed to the pair of second supported parts 122 with a spacer 28 sandwiched between them. Therefore, the first and second position fixing parts 221, 222 of the housing member 22 are fixed in position with respect to the first and second supported parts 121, 122 of the substrate 12.

[0025] In this embodiment, four spacers 28 are provided, each having a cylindrical shape, for example. A through hole penetrating in the substrate thickness direction Dt is formed on the inside of each spacer 28, but the through hole on the inside of each spacer 28 is not shown in FIG.

[0026] For example, the first position fixing portion 221 of the housing member 22, the spacer 28, the first supported portion 121 of the substrate 12, and the installation base 26, which are aligned in the substrate thickness direction Dt, are screwed and fixed to the substrate installation member 20 by a screw (not shown) that penetrates them and is screwed into the substrate installation member 20. In addition, the second position fixing portion 222 of the housing member 22, the spacer 28, the second supported portion 122 of the substrate 12, and the installation base 26, which are aligned in the substrate thickness direction Dt, are also screwed and fixed to the substrate installation member 20 by a screw (not shown) that penetrates them and is screwed into the substrate installation member 20.

[0027] In this manner, the housing member 22 is fixed to and supported by the board installation member 20 at the first and second position fixing portions 221 and 222, respectively.

[0028] The elastic bodies 24 are made of, for example, elastic rubber, and are therefore elastically deformable in the substrate thickness direction Dt. The elastic bodies 24 are provided between the substrate 12 and the housing member 22, and are joined to the substrate 12 and the housing member 22. The elastic bodies 24 are also arranged side by side in the second direction D2.

[0029] The multiple elastic bodies 24 are disposed in a central position between the first supported portion 121 and the second supported portion 122 of the substrate 12 in the first direction D1. That is, the multiple elastic bodies 24 are disposed away from each of the first supported portion 121 and the second supported portion 122. In detail, the central position of the substrate 12 in the first direction D1 is a maximum amplitude position Px where the displacement amplitude at the time of resonance of the substrate 12 becomes maximum in a virtual independent vibration state described later. Therefore, the multiple elastic bodies 24 are joined to the substrate 12 at the maximum amplitude position Px.

[0030] Each of the elastic bodies 24 has one end 241 provided on one side in the substrate thickness direction Dt and the other end 242 provided on the other side in the substrate thickness direction Dt. The one end 241 of the elastic body 24 is joined to the housing member 22 at a central position between the first position fixing portion 221 and the second position fixing portion 222 in the first direction D1.

[0031] Meanwhile, the other end 242 of the elastic body 24 is joined to the substrate 12 at a central position between the first supported portion 121 and the second supported portion 122 in the first direction D1. The joining between the elastic body 24 and the housing member 22, and the joining between the elastic body 24 and the substrate 12 are both adhesively fixed by an adhesive. The substrate 12 and the housing member 22 connected to each other via the elastic body 24 in this manner constitute the substrate composite body 30.

[0032] Further, each of the multiple elastic bodies 24 is in a compressed state in which it is elastically compressed in the substrate thickness direction Dt when the substrate support structure 10 is in a stationary state where it is not vibrating.

[0033] Here, the substrate support structure 80 of the comparative example shown in FIG. 3 will be described. The substrate support structure 80 of the comparative example is obtained by removing all the elastic bodies 24 from the substrate support structure 10 of the present embodiment. That is, the substrate support structure 80 of the comparative example has the same configuration as the substrate support structure 10 of the present embodiment except that there is no elastic body 24. Therefore, it can be said that the substrate support structure 80 of the comparative example in FIG. 3 represents a virtual independent vibration state in which the elastic body 24 is not provided in the substrate support structure 10 of the present embodiment and the substrate 12 and the housing member 22 can vibrate separately.

[0034] In this substrate support structure 80 of the comparative example, in the frequency response in which vibrations reciprocating in the substrate thickness direction Dt are applied, the housing member 22 and the substrate 12 resonate at different resonance frequencies. The resonance frequency of the housing member 22 at this time is called the first independent resonance frequency FA1, and the resonance frequency of the substrate 12 at this time is called the second independent resonance frequency FA2. And the housing member 22 and the substrate 12 are each configured such that the first and second independent resonance frequencies FA1 and FA2 have a relationship of "FA1 < FA2". In other words, in the virtual independent vibration state in the substrate support structure 10 of the present embodiment, the first and second independent resonance frequencies FA1 and FA2 have a relationship of "FA1 < FA2". This is the end of the description regarding the comparative example.

[0035] Therefore, in the substrate support structure 10 of the present embodiment, in the frequency response in which vibrations reciprocating in the substrate thickness direction Dt are applied, the substrate composite 30 generates resonance due to including the housing member 22 and resonance due to including the substrate 12, respectively. The resonance frequency when the substrate composite 30 resonates due to including the housing member 22 is called the first resonance frequency FQ1, and the resonance frequency when the substrate composite 30 resonates due to including the substrate 12 is called the second resonance frequency FQ2. Note that the first resonance frequency FQ1 corresponds to one resonance frequency of the present disclosure, and the second resonance frequency FQ2 corresponds to the other resonance frequency of the present disclosure.

[0036] The first resonance frequency FQ1 corresponds to the first independent resonance frequency FA1 in a virtual independent vibration state, but due to the elastic body 24 being joined to the housing member 22, it is a frequency slightly shifted from the first independent resonance frequency FA1. Also, the second resonance frequency FQ2 corresponds to the second independent resonance frequency FA2 in a virtual independent vibration state, but due to the elastic body 24 being joined to the substrate 12, it is a frequency slightly shifted from the second independent resonance frequency FA2.

[0037] Therefore, the first resonance frequency FQ1 and the second resonance frequency FQ2 are different frequencies from each other. Specifically, similar to the magnitude relationship between the first and second independent resonance frequencies FA1 and FA2, the first and second resonance frequencies FQ1 and FQ2 have a relationship of "FQ1 < FQ2".

[0038] For example, in the first resonance mode, which is a resonance state where the substrate composite 30 of the present embodiment resonates at the first resonance frequency FQ1, the respective deflection states of the housing member 22 and the substrate 12 are schematically shown in FIG. 4. As shown in FIG. 4, in the first resonance mode, the vibration of the housing member 22 is transmitted to the substrate 12 via the elastic body 24, and the substrate 12 is vibrated while being dragged by the resonance of the housing member 22.

[0039] On the other hand, in the second resonance mode, which is a resonance state where the substrate composite 30 of the present embodiment resonates at the second resonance frequency FQ2, the respective deflection states of the housing member 22 and the substrate 12 are schematically shown in FIG. 5. As shown in FIG. 5, in the second resonance mode, since the housing member 22 vibrates at a frequency exceeding the first resonance frequency FQ1, the vibration of the housing member 22 is out of phase with the vibration of the substrate 12. Therefore, the vibration of the housing member 22 acts to suppress the resonance of the substrate 12.

[0040] Note that in FIGS. 4 and 5, for the sake of easy understanding, the respective deflections of the housing member 22 and the substrate 12 are exaggeratedly shown. Also, as shown in FIGS. 4 and 5, each vibration of the substrate 12 and the housing member 22 described in the present embodiment and the comparative example is, unless otherwise specified, a vibration in the bending first mode.

[0041] Next, the relationship between the acceleration amplitude Aa occurring in the substrate 12 in each of the first and second resonance modes and the Young's modulus Eg of the elastic body 24 will be described with reference to FIG. 6. The vertical axis of FIG. 6 indicates the acceleration amplitude Aa occurring at a predetermined position of the substrate 12, i.e., a predetermined substrate position, and the horizontal axis indicates the Young's modulus Eg of the elastic body 24. The Young's modulus Eg shown on the horizontal axis of the graph in FIG. 6 is the sum of the Young's modulus of all the elastic bodies 24. Note that the predetermined substrate position is specifically the center of the substrate 12, but may be any fixed position of the substrate 12 that vibrates. Also, FIG. 6 and FIG. 7 described later each show the results of a computer simulation.

[0042] In Figure 6, relationship line L1 shows the relationship between the acceleration amplitude Aa at a specific position on the substrate in the first resonance mode and the Young's modulus Eg of the elastic body 24, in other words, the relationship between the acceleration amplitude Aa at a specific position on the substrate in the first resonance mode and the Young's modulus Eg of the elastic body 24.

[0043] 6, the greater the Young's modulus Eg of the elastic body 24, the greater the acceleration amplitude Aa at a predetermined position on the board in the first resonance mode. In other words, the greater the elastic rigidity, which is the rigidity when the elastic body 24 expands and contracts in the board thickness direction Dt, the greater the acceleration amplitude Aa at a predetermined position on the board in the first resonance mode. This is because the greater the elastic rigidity of the elastic body 24, the more easily the vibration of the housing member 22 is transmitted via the elastic body 24 to the board 12, which vibrates in the same phase as the housing member 22.

[0044] In Figure 6, relationship line L2 shows the relationship between the acceleration amplitude Aa at a specific position on the substrate in the second resonance mode and the Young's modulus Eg of the elastic body 24, in other words, the relationship between the acceleration amplitude Aa at a specific position on the substrate in the second resonance mode and the Young's modulus Eg of the elastic body 24.

[0045] 6, the greater the Young's modulus Eg of the elastic body 24, the smaller the acceleration amplitude Aa at the predetermined position on the board in the second resonance mode. In other words, the greater the elastic rigidity of the elastic body 24, the smaller the acceleration amplitude Aa at the predetermined position on the board in the second resonance mode. This is because the force of the housing member 22, which vibrates in an inverted phase with respect to the board 12, attempting to suppress the vibration of the board 12 is more easily transmitted to the board 12 via the elastic body 24 as the elastic rigidity of the elastic body 24 increases.

[0046] 6, for reference, a relationship line L3 shows the relationship between the acceleration amplitude Aa at a predetermined position on the substrate and the Young's modulus Eg of the elastic body 24 when the substrate support structure 10 in the hypothetical independent vibration state vibrates at the first independent resonant frequency FA1. A relationship line L4 shows the relationship between the acceleration amplitude Aa at a predetermined position on the substrate and the Young's modulus Eg of the elastic body 24 when the substrate support structure 10 in the hypothetical independent vibration state vibrates at the second independent resonant frequency FA2.

[0047] From the above-mentioned relation lines L1 and L2, if the Young's modulus Eg of the elastic body 24 is taken as the Young's modulus Eg indicated by the intersection Pa of the relation lines L1 and L2, it is considered that the effect of reducing the acceleration amplitude Aa at the predetermined position on the substrate is exhibited in a well-balanced manner in both the first resonance mode and the second resonance mode. Therefore, the Young's modulus Eg of the elastic body 24 provided in the substrate support structure 10 of this embodiment is taken as the Young's modulus Eg indicated by the intersection Pa in FIG.

[0048] Fig. 7 shows the frequency response of the acceleration amplitude Aa at a predetermined position of the substrate. In the frequency response of Fig. 7, a vibration with an amplitude of 0.1 G is applied to the substrate support structure 10. The "0.1 G" means 0.1 times the acceleration of gravity.

[0049] The relation line LA in Fig. 7 shows the frequency response of the acceleration amplitude Aa at the predetermined position on the substrate obtained in the substrate support structure 10 of this embodiment having the elastic body 24 as shown in Fig. 1. To be sure, the Young's modulus Eg of the elastic body 24 at this time is the Young's modulus Eg shown by the intersection point Pa in Fig. 6. On the other hand, the relation line LB in Fig. 7 shows the frequency response of the acceleration amplitude Aa at the predetermined position on the substrate obtained in the substrate support structure 10 in a virtual independent vibration state in which the elastic body 24 is not provided as shown in Fig. 3.

[0050] A first relation point P1, which is a first maximum point on the relation line LA, indicates a first acceleration amplitude A1a, which is the acceleration amplitude Aa generated at a predetermined position on the substrate when the substrate composite 30 resonates at a first resonance frequency FQ1 in the substrate support structure 10 of this embodiment including the elastic body 24. In other words, this first acceleration amplitude A1a is the acceleration amplitude Aa at the predetermined position on the substrate in the first resonance mode described above.

[0051] The second relation point P2, which is the second maximum point on the relation line LA, indicates the second acceleration amplitude A2a, which is the acceleration amplitude Aa generated at the predetermined position on the substrate when the substrate composite 30 resonates at the second resonance frequency FQ2 in the substrate support structure 10 of this embodiment including the elastic body 24. In other words, this second acceleration amplitude A2a is the acceleration amplitude Aa at the predetermined position on the substrate in the above-mentioned second resonance mode.

[0052] Furthermore, the third relationship point P3, which is a maximum point on the relationship line LB, indicates the acceleration amplitude A3a at independent resonance, which is the acceleration amplitude Aa that occurs at a specific position on the substrate when the substrate 12 resonates at the second independent resonant frequency FA2 in the substrate support structure 10 in a virtual independent vibration state.

[0053] As shown in FIG. 7, the second independent resonant frequency FA2 is higher than the first resonant frequency FQ1 and lower than the second resonant frequency FQ2.

[0054] 7, the first and second acceleration amplitudes A1a, A2a generated in the substrate support structure 10 of this embodiment are both smaller than the acceleration amplitude A3a at single resonance. The vibration reduction effect of this embodiment achieved by connecting the substrate 12 and the housing member 22 via the elastic body 24 is expressed as the difference between the first and second acceleration amplitudes A1a, A2a and the acceleration amplitude A3a at single resonance.

[0055] In this embodiment, the magnitude relationship between the first and second acceleration amplitudes A1a, A2a and the acceleration amplitude A3a at single resonance shown in Fig. 7 is realized by adjusting the elastic stiffness of the elastic body 24, specifically, by adjusting the Young's modulus Eg of the elastic body 24. That is, the elastic stiffness of the elastic body 24 in this embodiment is determined so that the first acceleration amplitude A1a and the second acceleration amplitude A2a are each smaller than the acceleration amplitude A3a at single resonance.

[0056] Specifically, in this embodiment, the first acceleration amplitude A1a and the second acceleration amplitude A2a shown by the relation line LA in Fig. 7 are equal in magnitude to each other. That is, in detail, the expansion and contraction rigidity of the elastic body 24 in this embodiment is determined so that the first acceleration amplitude A1a and the second acceleration amplitude A2a are equal in magnitude to each other.

[0057] The substrate support structure 10 of the present embodiment provides the following advantageous effects.

[0058] (1) As described above, according to this embodiment, as shown in Fig. 1, elastic body 24 is provided between substrate 12 and housing member 22. Elastic body 24 is joined to housing member 22 between first position fixing portion 221 and second position fixing portion 222 of housing member 22, and is joined to substrate 12 between first supported portion 121 and second supported portion 122 of substrate 12. Substrate 12 and housing member 22 constitute substrate composite body 30, and substrate composite body 30 generates resonance due to the inclusion of housing member 22 and resonance due to the inclusion of substrate 12.

[0059] Furthermore, as shown in FIG. 7, the first resonant frequency FQ1 at which the substrate composite 30 resonates due to the inclusion of the housing member 22 is different from the second resonant frequency FQ2 at which the substrate composite 30 resonates due to the inclusion of the substrate 12.

[0060] Therefore, when the substrate composite body 30 resonates at the second resonant frequency FQ2, the housing member 22 is vibrated as if being dragged by the resonance of the substrate 12, and the housing member 22 acts to suppress the resonance of the substrate 12. Therefore, the resonance caused by the substrate 12 can be suppressed by the housing member 22.

[0061] Specifically, according to this embodiment, the first resonant frequency FQ1 is lower than the second resonant frequency FQ2, as shown in Fig. 7. Therefore, by utilizing a mechanism in which the phase of the vibration of the housing member 22 is inverted before and after the first resonant frequency FQ1, the vibration of the board 12 during resonance at the second resonant frequency FQ2 can be suppressed by the housing member 22.

[0062] (2) Furthermore, according to this embodiment, as shown in Fig. 1, the elastic body 24 is adhesively fixed to each of the housing member 22 and the substrate 12. Therefore, the elastic body 24 can be easily fixed to each of the housing member 22 and the substrate 12 by applying an adhesive. For example, even in a small space, the elastic body 24 can be easily fixed to each of the housing member 22 and the substrate 12.

[0063] (3) Furthermore, according to this embodiment, the elastic body 24 is joined to the substrate 12 at a maximum amplitude position Px where the displacement amplitude of the substrate 12 at resonance becomes maximum in a virtual independent vibration state in which the substrate 12 and the housing member 22 can vibrate separately without the elastic body 24. This makes it possible to maximize the vibration suppression effect of suppressing the vibration of the substrate 12 by utilizing a mechanism in which the phase of the vibration of the housing member 22 is inverted around the first resonance frequency FQ1.

[0064] (4) Furthermore, according to this embodiment, all of the elastic bodies 24 are disposed away from the first supported portion 121 and the second supported portion 122 of the substrate 12. Therefore, all of the elastic bodies 24 can be utilized to obtain the vibration suppression effect.

[0065] (5) According to this embodiment, as shown in Fig. 7, the first and second acceleration amplitudes A1a and A2a generated in the substrate support structure 10 having the elastic body 24 are both smaller than the acceleration amplitude A3a at the single resonance. That is, a resonance at the first resonance frequency FQ1 is newly generated in the substrate 12 by the connection between the housing member 22 and the substrate 12 via the elastic body 24, but the first acceleration amplitude A1a at the resonance at the first resonance frequency FQ1 is smaller than the acceleration amplitude A3a at the single resonance. Therefore, it is possible to prevent the vibration suppression effect on the substrate 12 from being impaired by the connection between the housing member 22 and the substrate 12 via the elastic body 24.

[0066] (6) According to this embodiment, the elastic stiffness of the elastic body 24 is set so that the first acceleration amplitude A1a and the second acceleration amplitude A2a are smaller than the acceleration amplitude A3a at single resonance. Therefore, by selecting the material of the elastic body 24, it is possible to easily set the magnitudes of the first and second acceleration amplitudes A1a and A2a so as to produce a vibration suppression effect on the substrate 12.

[0067] Second embodiment Next, a second embodiment will be described. In this embodiment, differences from the first embodiment will be mainly described. Also, parts that are the same as or equivalent to the above-mentioned embodiment will be omitted or simplified. This also applies to the following embodiments.

[0068] In the first embodiment described above, the expansion / contraction stiffness of the elastic body 24 is set using the acceleration amplitude Aa (see FIG. 7) at a predetermined position on the substrate as an index. In contrast, in this embodiment, as shown in FIG. 8, the expansion / contraction stiffness of the elastic body 24 is set using the displacement amplitude Ap at a predetermined position on the substrate as an index instead of the acceleration amplitude Aa at the predetermined position on the substrate. The displacement amplitude Ap at the predetermined position on the substrate is the amplitude of the displacement amount at the predetermined position on the substrate when the substrate 12 vibrates.

[0069] 6 shows that the greater the Young's modulus Eg of the elastic body 24, the greater the acceleration amplitude Aa at the predetermined position on the substrate in the first resonance mode, but the smaller the acceleration amplitude Aa at the predetermined position on the substrate in the second resonance mode. This tendency is the same even if the acceleration amplitude Aa is replaced with the displacement amplitude Ap. That is, the greater the Young's modulus Eg of the elastic body 24, the greater the displacement amplitude Ap at the predetermined position on the substrate in the first resonance mode. And the greater the Young's modulus Eg of the elastic body 24, the smaller the displacement amplitude Ap at the predetermined position on the substrate in the second resonance mode.

[0070] Therefore, in this embodiment, the displacement amplitude Ap is used as an index for suppressing vibration of the substrate 12, but the expansion and contraction rigidity of the elastic body 24 is set based on the same concept as in the first embodiment.

[0071] The frequency response of the displacement amplitude Ap of the substrate position is shown in Fig. 8. In this frequency response of Fig. 8, a vibration of amplitude 0.1 G is applied to the substrate support structure 10, similar to the frequency response of Fig. 7.

[0072] The relationship line LE in Fig. 8 shows the frequency response of the displacement amplitude Ap at a predetermined position on the substrate obtained in the substrate support structure 10 of this embodiment having the elastic body 24 as shown in Fig. 1. On the other hand, the relationship line LF in Fig. 8 shows the frequency response of the displacement amplitude Ap at a predetermined position on the substrate obtained in the substrate support structure 10 in a virtual independent vibration state in which the elastic body 24 is not provided as shown in Fig. 3. The relationship line LE in Fig. 8 corresponds to the relationship line LA in Fig. 7, and the relationship line LF in Fig. 8 corresponds to the relationship line LB in Fig. 7.

[0073] A first relation point P1p, which is a first maximum point on the relation line LE, indicates a first displacement amplitude A1p, which is a displacement amplitude Ap generated at a predetermined position on the substrate when the substrate composite 30 resonates at the first resonance frequency FQ1 in the substrate support structure 10 of this embodiment including the elastic body 24. In other words, this first displacement amplitude A1p is the displacement amplitude Ap at the predetermined position on the substrate in the above-mentioned first resonance mode.

[0074] A second relation point P2p, which is a second maximum point on the relation line LE, indicates a second displacement amplitude A2p, which is a displacement amplitude Ap generated at a predetermined position on the substrate when the substrate composite 30 resonates at the second resonance frequency FQ2 in the substrate support structure 10 of this embodiment including the elastic body 24. In other words, this second displacement amplitude A2p is the displacement amplitude Ap at the predetermined position on the substrate in the above-mentioned second resonance mode.

[0075] Furthermore, the third relationship point P3p, which is a maximum point on the relationship line LF, indicates the displacement amplitude A3p at independent resonance, which is the displacement amplitude Ap that occurs at a specific position on the substrate when the substrate 12 resonates at the second independent resonant frequency FA2 in the substrate support structure 10 in a virtual independent vibration state shown in Figure 3.

[0076] 8, the first and second displacement amplitudes A1p, A2p generated in the substrate support structure 10 of this embodiment are both smaller than the displacement amplitude A3p at the time of single resonance. The vibration reduction effect of this embodiment achieved by connecting the substrate 12 and the housing member 22 via the elastic body 24 appears as the difference between the first and second displacement amplitudes A1p, A2p and the displacement amplitude A3p at the time of single resonance.

[0077] In this embodiment, the magnitude relationship between the first and second displacement amplitudes A1p, A2p and the displacement amplitude A3p at single resonance shown in Fig. 8 is realized by adjusting the elastic stiffness of the elastic body 24, specifically, by adjusting the Young's modulus Eg of the elastic body 24. That is, the elastic stiffness of the elastic body 24 in this embodiment is determined so that the first displacement amplitude A1p and the second displacement amplitude A2p are each smaller than the displacement amplitude A3p at single resonance.

[0078] Just to be clear, in both this embodiment and the first embodiment, the first and second displacement amplitudes A1p, A2p are each smaller than the displacement amplitude A3p at single resonance, and the first and second acceleration amplitudes A1a, A2a are each smaller than the acceleration amplitude A3a at single resonance.

[0079] Specifically, in this embodiment, the first displacement amplitude A1p and the second displacement amplitude A2p shown by the relation line LE in Fig. 8 are equal in magnitude to each other. That is, in detail, the elastic rigidity of the elastic body 24 in this embodiment is determined so that the first displacement amplitude A1p and the second displacement amplitude A2p are equal in magnitude to each other.

[0080] (1) As described above, according to this embodiment, as shown in Fig. 8, the first and second displacement amplitudes A1p and A2p generated in the substrate support structure 10 having the elastic body 24 are both smaller than the displacement amplitude A3p at the time of single resonance. That is, a resonance at the first resonance frequency FQ1 is newly generated in the substrate 12 by the connection between the housing member 22 and the substrate 12 via the elastic body 24, but the first displacement amplitude A1p at the time of resonance at the first resonance frequency FQ1 is smaller than the displacement amplitude A3p at the time of single resonance. Therefore, as in the first embodiment, it is possible to prevent the vibration suppression effect on the substrate 12 from being impaired by the connection between the housing member 22 and the substrate 12 via the elastic body 24.

[0081] (2) According to this embodiment, the elastic stiffness of the elastic body 24 is set so that the first displacement amplitude A1p and the second displacement amplitude A2p are smaller than the single resonance displacement amplitude A3p. Therefore, by selecting the material of the elastic body 24, it is possible to easily set the magnitudes of the first and second displacement amplitudes A1p and A2p so as to produce a vibration suppression effect on the substrate 12.

[0082] Except for the points described above, this embodiment is similar to the first embodiment. In this embodiment, the same effects as those of the first embodiment can be obtained from the configuration common to the first embodiment.

[0083] Third embodiment Next, a third embodiment will be described. In this embodiment, differences from the first embodiment will be mainly described.

[0084] 9, in this embodiment, the elastic body 24 is formed of a compression coil spring. In this respect, this embodiment differs from the first embodiment.

[0085] 9, the substrate 12, the housing member 22, and the elastic body 24 of the substrate support structure 10 are selectively shown, and the rest are omitted from the illustration. This also applies to the figures corresponding to FIG. 9, which will be described later.

[0086] The elastic body 24 of this embodiment, which is a coil spring, is provided in a position in which it can expand and contract in the substrate thickness direction Dt. That is, the elastic body 24 is elastically deformable in the substrate thickness direction Dt. The spring constant of the elastic body 24 corresponds to the expansion and contraction rigidity of the elastic body 24.

[0087] In this embodiment, too, the substrate 12 and the housing member 22 are supported by the substrate installation member 20 (see FIG. 1) in the same manner as in the first embodiment. Therefore, in this embodiment, the substrate 12 and the housing member 22 are supported at both ends, similar to the first embodiment.

[0088] Except for the points described above, this embodiment is similar to the first embodiment. In this embodiment, the same effects as those of the first embodiment can be obtained from the configuration common to the first embodiment.

[0089] It should be noted that although this embodiment is a modification based on the first embodiment, this embodiment can also be combined with the above-mentioned second embodiment.

[0090] (Fourth embodiment) Next, a fourth embodiment will be described. In this embodiment, differences from the third embodiment will be mainly described.

[0091] 10, the elastic body 24 of this embodiment is a spring, but is not a coil spring. Specifically, the spring as the elastic body 24 of this embodiment is made of a wire bent into a U-shape, and is fixed to the substrate 12 while being pressed against the housing member 22.

[0092] In this embodiment, similarly to the third embodiment, the substrate 12 and the housing member 22 are supported at both ends by the substrate installation member 20 (see FIG. 1).

[0093] Except for the points described above, this embodiment is similar to the third embodiment. In this embodiment, the same effects as those of the third embodiment can be obtained from the configuration common to the third embodiment.

[0094] Fifth embodiment Next, a fifth embodiment will be described. In this embodiment, differences from the first embodiment will be mainly described.

[0095] 11, in this embodiment, the elastic body 24 is made of a resin material having elasticity. In this respect, this embodiment differs from the first embodiment.

[0096] The resin material constituting the elastic body 24 in this embodiment is, for example, a molding material that covers and protects electronic components and the like mounted on the substrate 12, or a shielding material with a shielding function. In addition, there is one elastic body 24 in this embodiment.

[0097] In this embodiment, similarly to the first embodiment, the substrate 12 and the housing member 22 are supported at both ends by the substrate installation member 20 (see FIG. 1).

[0098] Except for the points described above, this embodiment is similar to the first embodiment. In this embodiment, the same effects as those of the first embodiment can be obtained from the configuration common to the first embodiment.

[0099] It should be noted that although this embodiment is a modification based on the first embodiment, this embodiment can also be combined with the above-mentioned second embodiment.

[0100] Sixth embodiment Next, a sixth embodiment will be described. In this embodiment, differences from the first embodiment will be mainly described.

[0101] 12, in this embodiment, the size of the housing member 22 is different from that of the substrate 12. For example, the housing member 22 is larger than the substrate 12 in the first direction D1 and the second direction D2. Also, in this embodiment, there is one elastic body 24. In these respects, this embodiment differs from the first embodiment.

[0102] In this embodiment, similarly to the first embodiment, the substrate 12 and the housing member 22 are supported at both ends by the substrate installation member 20 (see FIG. 1).

[0103] Except for the points described above, this embodiment is similar to the first embodiment. In this embodiment, the same effects as those of the first embodiment can be obtained from the configuration common to the first embodiment.

[0104] It should be noted that although this embodiment is a modification based on the first embodiment, this embodiment can also be combined with the above-mentioned second embodiment.

[0105] Seventh embodiment Next, a seventh embodiment will be described. In this embodiment, differences from the first embodiment will be mainly described.

[0106] 13, the substrate support structure 10 of this embodiment includes a first substrate 12, which is the same as the substrate 12 of the first embodiment, and a second substrate 13. The second substrate 13 is a printed circuit board similar to the first substrate 12, and for example, a plurality of electronic components are mounted and fixed on the surface of the second substrate 13.

[0107] The second substrate 13 is disposed between the first substrate 12 and the housing member 22. That is, the second substrate 13 is disposed so as to overlap with one side of the first substrate 12 in the substrate thickness direction Dt.

[0108] In this embodiment, there is one elastic body 24. The elastic body 24 is provided between the first substrate 12 and the second substrate 13, and is joined to the first substrate 12 and the second substrate 13. On the other hand, the elastic body 24 is not provided between the housing member 22 and the second substrate 13, and is disposed apart from the housing member 22.

[0109] Therefore, in this embodiment, one of first substrate 12 and second substrate 13 connected via elastic body 24 corresponds to the substrate of the present disclosure, and the other corresponds to the substrate juxtaposition portion of the present disclosure. Substrate composite body 30 of the present embodiment is composed of first substrate 12 and second substrate 13, and does not include housing member 22.

[0110] Incidentally, first substrate 12, second substrate 13 and housing member 22 of this embodiment are each supported at both ends by substrate installation member 20 (see FIG. 1), similar to substrate 12 and housing member 22 of the first embodiment.

[0111] Except for the points described above, this embodiment is similar to the first embodiment. In this embodiment, the same effects as those of the first embodiment can be obtained from the configuration common to the first embodiment.

[0112] It should be noted that although this embodiment is a modification based on the first embodiment, this embodiment can also be combined with the above-mentioned second embodiment.

[0113] Eighth embodiment Next, an eighth embodiment will be described. In this embodiment, differences from the seventh embodiment will be mainly described.

[0114] 14, the substrate support structure 10 of this embodiment has two elastic bodies 24. One of the two elastic bodies 24 is provided between the first substrate 12 and the second substrate 13, and is bonded to the first substrate 12 and the second substrate 13, similar to the seventh embodiment.

[0115] Furthermore, in this embodiment, the other of the two elastic bodies 24 is provided between the housing member 22 and the second substrate 13 and is joined to the housing member 22 and the second substrate 13.

[0116] Therefore, in this embodiment, housing member 22 corresponds to the substrate juxtaposition portion of the present disclosure, and first substrate 12 and second substrate 13 each correspond to the substrate of the present disclosure. Substrate composite body 30 of the present embodiment is composed of first substrate 12, second substrate 13, and housing member 22.

[0117] The Young's modulus Eg of the two elastic bodies 24 is experimentally set in advance so that vibrations at all resonances of the substrate composite 30 are smaller than vibrations at the resonances of the substrates 12 and 13 in a virtual independent vibration state. Specifically, all resonances of the substrate composite 30 include resonances caused by the substrate composite 30 including the housing member 22, resonances caused by the substrate composite 30 including the first substrate 12, and resonances caused by the substrate composite 30 including the second substrate 13. The virtual independent vibration state in this embodiment is a virtual state in which none of the elastic bodies 24 are provided in the substrate support structure 10 and the first substrate 12, the second substrate 13, and the housing member 22 can vibrate separately.

[0118] Except for the points described above, this embodiment is similar to the seventh embodiment. In this embodiment, the same effects as those of the seventh embodiment can be obtained from the configuration common to the seventh embodiment.

[0119] Ninth embodiment Next, a ninth embodiment will be described. In this embodiment, differences from the first embodiment will be mainly described.

[0120] As shown in FIGS. 15 and 16, in this embodiment, the arrangement of the elastic body 24 is different from that in the first embodiment.

[0121] In this embodiment, two elastic bodies 24 are also provided. The two elastic bodies 24 are arranged side by side with a gap in between in the first direction D1. For example, each of the two elastic bodies 24 is provided at a position where the amplitude of vibration of the substrate 12 becomes larger than a predetermined threshold value.

[0122] In this embodiment, the substrate 12 and the housing member 22 are supported by the substrate installation member 20 at both ends, similarly to the first embodiment.

[0123] Except for the points described above, this embodiment is similar to the first embodiment. In this embodiment, the same effects as those of the first embodiment can be obtained from the configuration common to the first embodiment.

[0124] It should be noted that although this embodiment is a modification based on the first embodiment, this embodiment can also be combined with the above-mentioned second embodiment.

[0125] Tenth embodiment Next, a tenth embodiment will be described. In this embodiment, differences from the first embodiment will be mainly described.

[0126] 17 and 18, in this embodiment, the maximum amplitude position Px where the displacement amplitude when the substrate 12 resonates in a virtual independent vibration state is maximum is biased to one side in the first direction D1 between the first supported portion 121 and the second supported portion 122. Therefore, the elastic body 24 is disposed biased to one side in the first direction D1 between the first supported portion 121 and the second supported portion 122. In this respect, this embodiment differs from the first embodiment.

[0127] In this embodiment, similarly to the first embodiment, the substrate 12 and the housing member 22 are supported at both ends by the substrate installation member 20. Also, there is one elastic body 24 in this embodiment.

[0128] Except for the points described above, this embodiment is similar to the first embodiment. In this embodiment, the same effects as those of the first embodiment can be obtained from the configuration common to the first embodiment.

[0129] It should be noted that although this embodiment is a modification based on the first embodiment, this embodiment can also be combined with the above-mentioned second embodiment.

[0130] Eleventh embodiment Next, an eleventh embodiment will be described. In this embodiment, differences from the first embodiment will be mainly described.

[0131] 19, the substrate 12 of this embodiment is not rectangular but polygonal in shape, which is what makes this embodiment different from the first embodiment.

[0132] In this embodiment, the substrate 12 and the housing member 22 are supported at both ends by the substrate installation member 20 (see FIG. 1) in the same manner as in the first embodiment. Also, there is one elastic body 24 in this embodiment.

[0133] Except for the points described above, this embodiment is similar to the first embodiment. In this embodiment, the same effects as those of the first embodiment can be obtained from the configuration common to the first embodiment.

[0134] It should be noted that although this embodiment is a modification based on the first embodiment, this embodiment can also be combined with the above-mentioned second embodiment.

[0135] Twelfth embodiment Next, a twelfth embodiment will be described. In this embodiment, differences from the first embodiment will be mainly described.

[0136] 20, the substrate 12 of this embodiment has a quadrangular shape rather than a rectangular shape. For example, the substrate 12 of this embodiment has a trapezoidal shape. In this respect, this embodiment is different from the first embodiment.

[0137] In this embodiment, the substrate 12 and the housing member 22 are supported at both ends by the substrate installation member 20 (see FIG. 1) in the same manner as in the first embodiment. Also, there is one elastic body 24 in this embodiment.

[0138] Except for the points described above, this embodiment is similar to the first embodiment. In this embodiment, the same effects as those of the first embodiment can be obtained from the configuration common to the first embodiment.

[0139] It should be noted that although this embodiment is a modification based on the first embodiment, this embodiment can also be combined with the above-mentioned second embodiment.

[0140] Thirteenth embodiment Next, a thirteenth embodiment will be described. In this embodiment, differences from the first embodiment will be mainly described.

[0141] 21, the substrate 12 of this embodiment has a shape other than a polygon, specifically, an elliptical shape. The long axis direction of the elliptical shape coincides with the first direction D1. In this respect, this embodiment differs from the first embodiment.

[0142] In this embodiment, the substrate 12 and the housing member 22 are supported at both ends by the substrate installation member 20 (see FIG. 1) in the same manner as in the first embodiment. Also, there is one elastic body 24 in this embodiment.

[0143] Except for the points described above, this embodiment is similar to the first embodiment. In this embodiment, the same effects as those of the first embodiment can be obtained from the configuration common to the first embodiment.

[0144] It should be noted that although this embodiment is a modification based on the first embodiment, this embodiment can also be combined with the above-mentioned second embodiment.

[0145] Fourteenth embodiment Next, a fourteenth embodiment will be described. In this embodiment, differences from the first embodiment will be mainly described.

[0146] 22, in this embodiment, the substrate support structure 10 includes a cover member 32 instead of the housing member 22 (see FIG. 1) of the first embodiment. Moreover, the substrate support structure 10 does not include the spacer 28 of FIG.

[0147] The cover member 32 of this embodiment has a board-joint portion 33 and a pair of extension portions 34, 35. The board-joint portion 33 and the pair of extension portions 34, 35 are integrally configured and constitute, for example, a single resin part.

[0148] In this embodiment, the substrate apposition section 33 is a component corresponding to the housing member 22 of the first embodiment. That is, in terms of points not mentioned in the description of this embodiment, the substrate apposition section 33 has the same configuration as the housing member 22 of the first embodiment.

[0149] Therefore, similarly to the housing member 22 of the first embodiment, the substrate juxtaposition portion 33 of this embodiment is arranged, for example, parallel to the substrate 12 and aligned with the substrate 12, and is arranged so as to overlap with the substrate 12 at a distance from the substrate 12 on one side in the substrate thickness direction Dt. The substrate juxtaposition portion 33 has a first position fixing portion 221 arranged on one side in the first direction D1 and a second position fixing portion 222 arranged on the other side in the first direction D1. The substrate 12 and the substrate juxtaposition portion 33 constitute a substrate composite body 30. The first and second position fixing portions 221 and 222 are provided one by one and are formed to extend in the second direction D2 (see FIG. 2).

[0150] The one-side extending portion 34, which is one of the pair of extending portions 34, 35, is disposed on one side in the first direction D1 with a gap between them and the substrate 12, and extends from the first position fixing portion 221 to the other side in the substrate thickness direction Dt. The one-side extending portion 34 is fixed to the substrate installation member 20 at an end portion that the one-side extending portion 34 has on the other side in the substrate thickness direction Dt. Therefore, the first position fixing portion 221 in this embodiment is fixed to the first and second supported portions 121, 122 of the substrate 12 via the one-side extending portion 34, the substrate installation member 20, and the installation base 26.

[0151] The other-side extending portion 35, which is the other of the pair of extending portions 34, 35, is disposed on the other side of the first direction D1 with a gap therebetween with respect to the substrate 12, and extends from the second position fixing portion 222 to the other side of the substrate thickness direction Dt. The other-side extending portion 35 is fixed to the substrate installation member 20 at an end portion that the other-side extending portion 35 has on the other side of the substrate thickness direction Dt. Therefore, the second position fixing portion 222 in this embodiment is fixed to the first and second supported portions 121, 122 of the substrate 12 via the other-side extending portion 35, the substrate installation member 20, and the installation base 26.

[0152] Except for the points described above, this embodiment is similar to the first embodiment. In this embodiment, the same effects as those of the first embodiment can be obtained from the configuration common to the first embodiment.

[0153] Fifteenth embodiment Next, a fifteenth embodiment will be described. In this embodiment, differences from the first embodiment will be mainly described.

[0154] 23, a substrate mounting member 40 of this embodiment has a different shape compared to the substrate mounting member 20 of the first embodiment. Furthermore, the substrate support structure 10 does not include the spacers 28 of FIG.

[0155] Specifically, the substrate mounting member 40 of this embodiment has a base portion 41 and a pair of extension portions 42, 43. The base portion 41 and the pair of extension portions 42, 43 are integrally configured and, for example, constitute a single component.

[0156] In this embodiment, the base portion 41 is a component corresponding to the substrate installation member 20 of the first embodiment. That is, in terms of points not mentioned in the description of this embodiment, the base portion 41 has the same configuration as the substrate installation member 20 of the first embodiment.

[0157] Therefore, similarly to the substrate installation member 20 of the first embodiment, the base portion 41 of the present embodiment is disposed, for example, on the other side of the substrate thickness direction Dt with a gap therebetween with respect to the substrate 12. The substrate 12 is fixed to the base portion 41 at each of the first and second supported portions 121, 122 with the installation pedestal 26 sandwiched between the base portion 41 and the substrate 12.

[0158] In this embodiment, the housing member 22 is provided with one each of the first and second position fixing portions 221, 222, which are formed so as to extend in the second direction D2 (see FIG. 2).

[0159] The one-side extending portion 42, which is one of a pair of extending portions 42, 43 of the substrate installation member 40, is disposed on one side in the first direction D1 with a gap therebetween with respect to the substrate 12, and extends from the base portion 41 to one side in the substrate thickness direction Dt. The one-side extending portion 42 is fixed to the first position fixing portion 221 of the housing member 22 at an end portion that the one-side extending portion 42 has on one side in the substrate thickness direction Dt. Therefore, the first position fixing portion 221 of this embodiment is fixed to the first and second supported portions 121, 122 of the substrate 12 via the substrate installation member 40 and the installation base 26.

[0160] The other of the pair of extensions 42, 43, that is, the other of the pair of extensions 42, 43, is disposed on the other side of the first direction D1 with a gap therebetween with respect to the substrate 12, and extends from the base portion 41 to one side in the substrate thickness direction Dt. The other-side extension 43 is fixed to the second position fixing portion 222 of the housing member 22 at an end portion that the other-side extension 43 has on one side in the substrate thickness direction Dt. Therefore, the second position fixing portion 222 of this embodiment is fixed to the first and second supported portions 121, 122 of the substrate 12 via the substrate installation member 40 and the installation base 26.

[0161] Except for the points described above, this embodiment is similar to the first embodiment. In this embodiment, the same effects as those of the first embodiment can be obtained from the configuration common to the first embodiment.

[0162] (Other embodiments) (1) In the above-described first embodiment, the elastic stiffness of the elastic body 24 is optimized by adjusting the Young's modulus Eg of the elastic body 24, but this is just one example. The elastic stiffness of the elastic body 24 also varies depending on the shape of the elastic body 24, so the elastic stiffness of the elastic body 24 may be optimized by adjusting the shape of the elastic body 24.

[0163] (2) In the above-described first embodiment, the Young's modulus Eg of the elastic body 24 is determined so that the first acceleration amplitude A1a and the second acceleration amplitude A2a shown in Fig. 7 have the same magnitude, but this is just one example. The relative magnitude relationship between the first acceleration amplitude A1a and the second acceleration amplitude A2a varies depending on the bending rigidity of the housing member 22 and the board 12. Therefore, for example, the shape (e.g., plate thickness, etc.) of the housing member 22 or the board 12 may be adjusted so that the first acceleration amplitude A1a and the second acceleration amplitude A2a have the same magnitude.

[0164] (3) In the third embodiment described above, as shown in FIG. 9, the elastic body 24 is configured as a coil spring, but it may be configured as a leaf spring instead of a coil spring.

[0165] The present disclosure is not limited to the above-described embodiment, and can be implemented in various modified forms. The above-described embodiments are not unrelated to each other, and can be appropriately combined, except in cases where the combination is clearly impossible.

[0166] In each of the above embodiments, the elements constituting the embodiment are not necessarily essential, unless otherwise specified as essential or considered to be obviously essential in principle. In each of the above embodiments, when the numbers, values, amounts, ranges, etc. of the components of the embodiment are mentioned, they are not limited to the specific numbers, except when specified as essential or when they are obviously limited to a specific number in principle. In each of the above embodiments, when the materials, shapes, positional relationships, etc. of the components are mentioned, they are not limited to the materials, shapes, positional relationships, etc., except when specified as essential or when they are obviously limited to a specific material, shape, positional relationship, etc. in principle. [Explanation of symbols]

[0167] 10 Substrate support structure 12 Substrate 22 Housing parts 24 Elastic Body 30 Substrate Complex 121 1st supported part 122 Second supported part 221 1st position fixing part 222 Second position fixing part Dt Board thickness direction (Board thickness direction)

Claims

1. 1. A substrate support structure comprising: a substrate (12, 13) having a first supported portion (121) and a second supported portion (122) disposed away from the first supported portion, the substrate (12, 13) being supported by the first supported portion and the second supported portion, a substrate juxtaposition section (12, 13, 22, 33) that is disposed on one side of the substrate in a thickness direction (Dt) thereof, has a first position fixing section (221) and a second position fixing section (222) that are fixed in position with respect to the first supported section and the second supported section and that are disposed apart from each other, and is supported by each of the first position fixing section and the second position fixing section; an elastic body (24) provided between the substrate and the substrate-joining portion, elastically deformable in the thickness direction, joined to the substrate-joining portion between the first position fixing portion and the second position fixing portion, and joined to the substrate between the first supported portion and the second supported portion; The substrate and the substrate juxtaposition portion constitute a substrate composite (30), the elastic body is in a compressed state in which it is elastically compressed in the thickness direction when the substrate composite is in a stationary state and not vibrating, the substrate composite body generates a resonance due to the inclusion of the substrate juxtaposition portion and a resonance due to the inclusion of the substrate, A substrate support structure, wherein one resonant frequency (FQ1) at which the substrate composite resonates due to the inclusion of the substrate juxtaposition portion is lower than the other resonant frequency (FQ2) at which the substrate composite resonates due to the inclusion of the substrate.

2. 2. The substrate support structure according to claim 1, wherein the elastic body is adhesively fixed to both the substrate juxtaposition portion and the substrate.

3. The substrate support structure according to claim 1 , wherein the elastic body is disposed away from each of the first supported portion and the second supported portion.

4. 3. The substrate support structure of claim 1, wherein the elastic body is joined to the substrate at a maximum amplitude position (Px) at which the displacement amplitude of the substrate at resonance is maximized in a virtual independent vibration state in which the elastic body is not provided and the substrate and the substrate annex portion can vibrate separately.

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