Circuit board and electronic device

Abstract

The present invention provides a circuit board capable of improving the workability of the attachment / detachment work of an electronic module, and an electronic device provided with the circuit board. A connector for connecting one end of an electronic module and a support for supporting the other end of the electronic module are mounted on a circuit board, and the support includes: a stud member having a flange fixed to a surface of the circuit board and a protruding portion standing from the flange; a lock member which is supported by the protrusion so as to be relatively rotatable, and which can be switched between a lock position in which the other end of the electronic module is pressed and an unlock position in which the other end is not pressed; and a torque generation unit that applies a rotational torque to the rotation of the lock member.

Description

Technical Field

[0001] The present invention relates to a circuit board and an electronic device including the circuit board. Background Art

[0002] An electronic device such as a notebook PC uses an electronic module such as an SSD by connecting it to a connector of a circuit board (mother board) on which a CPU is mounted (see, for example, Patent Document 1).

[0003] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2020-057737.

[0004] As described in Patent Document 1, usually, one end of an electronic module is connected to a connector mounted on a circuit board, and the other end is supported on the circuit board by a screw. In addition, in addition to the case where the electronic module is installed by an operator in a factory or the like, there is also a case where the user himself / herself replaces it. At this time, it is possible that the screw falls into the housing and is troublesome to recover or lost, which reduces the workability of the disassembly and assembly operations of the electronic module. Summary of the Invention

[0005] The present invention has been made in consideration of the above problems of the prior art, and an object thereof is to provide a circuit board and an electronic device including the circuit board that can improve the workability of the disassembly and assembly operations of an electronic module.

[0006] The circuit board according to the first aspect of the present invention is a circuit board on which a connector for connecting one end of an electronic module and a support member for supporting the other end of the electronic module are mounted. The support member includes: a stud member having a flange fixed to the surface of the circuit board and a protruding portion erected from the flange; a locking member rotatably supported by the protruding portion and capable of switching between a locking position for pressing the other end of the electronic module and an unlocking position for not pressing the other end; and a torque generating portion that imparts a rotational torque to the rotation of the locking member.

[0007] The electronic device according to the second aspect of the present invention includes: a circuit board on which a connector is mounted; an electronic module having one end connected to the connector; and a support member that supports the other end of the electronic module on the circuit board. The support member includes: a stud member having a flange fixed to the surface of the circuit board and a protruding portion erected from the flange; a locking member rotatably supported by the protruding portion and capable of switching between a locking position for pressing the other end of the electronic module and an unlocking position for not pressing the other end; and a torque generating portion that imparts a rotational torque to the rotation of the locking member.

[0008] According to the above aspect of the present invention, the workability of the disassembly and assembly operations of the electronic module can be improved. Brief Description of the Drawings

[0009] Figure 1 This is a top view of an electronic device according to an embodiment, looking down from above.

[0010] Figure 2 This is a top view schematically showing the internal structure of the housing.

[0011] Figure 3A This is a perspective view of the support member.

[0012] Figure 3B This is a perspective view of the support member observed from the back side.

[0013] Figure 4 This is an exploded perspective view of the support member.

[0014] Figure 5A This is a top view with the support member in the unlocked position.

[0015] Figure 5B This is Figure 5A a top view with the support member shown in the locked position.

[0016] Figure 6 This is a schematic side cross-sectional view of the electronic module supported by the support member.

[0017] Figure 7 This is a perspective view of the support member according to the first modification.

[0018] Figure 8 This is Figure 7 a schematic side cross-sectional view of the electronic module supported by the support member shown.

[0019] Figure 9 This is Figure 7 an exploded perspective view of the support member shown.

[0020] Figure 10A This is a perspective view of the support member and the positioning member according to the second modification.

[0021] Figure 10B This is Figure 10A a perspective view of the support member shown, observed from another angle.

[0022] Figure 11A This is Figure 10A a top view with the support member shown in the unlocked position.

[0023] Figure 11B This is Figure 11A a top view with the support member shown in the locked position.

[0024] Figure 12 This is Figure 10A a schematic side cross-sectional view of the electronic module supported by the support member shown.

[0025] Figure 13 is a schematic side cross-sectional view in which an electronic module is supported by a support member according to a third modification.

[0026] Figure 14 is a perspective view of a support member and a positioning member according to a fourth modification.

[0027] Explanation of reference numerals

[0028] 10... electronic device; 12... housing; 24... circuit board; 30... connector; 32, 33... electronic module; 40, 40A to 40D... support member; 42, 42A... stud member; 42a... flange; 42b, 60... protrusion; 42c, 61... hole portion; 44, 44A, 44B... locking member; 44a, 62, 72... shaft portion; 44a1... threaded hole; 44a2... groove portion; 44b... plate portion; 46, 46A... resistance member; 48... screw; 70... positioning member; 70b... spring portion; 70c... convex portion; 74a, 74b... concave portion; 76... resistance portion. Detailed description of the preferred embodiments

[0029] Hereinafter, preferred embodiments will be listed, and the electronic device and the circuit board according to the present invention will be described in detail with reference to the accompanying drawings.

[0030] Figure 1 is a view of an electronic device 10 according to an embodiment as viewed from above. As Figure 1 shown, the electronic device 10 of the present embodiment is a clamshell notebook PC. The electronic device 10 has a structure in which a lid body 11 and a housing 12 are rotatably connected to each other by a hinge 14. In the present embodiment, the electronic device 10 of the notebook PC is illustrated, but the electronic device may be, for example, a desktop PC, a tablet PC, a smart phone, or a portable game machine in addition to the notebook PC.

[0031] The lid body 11 has a thin and flat box-shaped housing. The lid body 11 is equipped with a display 16. The display 16 is, for example, an organic EL display or a liquid crystal display.

[0032] The housing 12 is a thin and flat box. The keyboard device 18 and the touchpad 19 face the upper surface (surface 12a) of the housing 12. Hereinafter, for the housing 12 and each component mounted on the housing 12, taking the posture of the operator operating the keyboard device 18 as a reference, the width direction (left and right) of the housing 12 is respectively referred to as the X1 and X2 directions, the depth direction (front and back) of the housing 12 is respectively referred to as the Y1 and Y2 directions, and the thickness direction (up and down) of the housing 12 is respectively referred to as the Z1 and Z2 directions for explanation. Sometimes the X1 and X2 directions are collectively referred to as the X direction, and the same applies to the Y1 and Y2 directions and the Z1 and Z2 directions, sometimes referred to as the Y direction and the Z direction. These respective directions are directions determined for convenience of explanation, and of course, there are cases where they change depending on the usage state or installation posture of the electronic device 10, etc.

[0033] The housing 12 is a housing formed by overlapping a first cover member 20 and a second cover member 21 in the thickness direction and detachably connecting them to each other. The first cover member 20 forms, for example, the upper surface and the peripheral side surfaces of the housing 12 and has a substantially bathtub shape. The second cover member 21 forms, for example, the lower surface of the housing 12 and has a substantially flat plate shape. The hinge 14 is provided in a concave hinge arrangement groove 12b formed at the rear edge portion of the housing 12 and connects the housing 12 and the lid body 11.

[0034] Figure 2 It is a top view schematically showing the internal structure of the housing 12. Figure 2 It is a view of observing the inside of the first cover member 20 from the lower surface side with the second cover member 21 removed.

[0035] As Figure 2 shown, a circuit board 24, a cooling module 25, and a battery device 26 are housed inside the housing 12. Various electronic components, mechanical components, etc. are also provided inside the housing 12.

[0036] The circuit board 24 is a printed circuit board that serves as the motherboard of the electronic device 10. The circuit board 24 is disposed on the Y2 side of the housing 12 and extends in the X direction. The circuit board 24 mounts a CPU (Central Processing Unit) 28 and a pair of connectors 30, 30. The CPU 28 is a processing device that performs operations related to the main control and processing of the electronic device 10. The connectors 30 are based on a specified connection standard, in this embodiment, the M.2 (M point two) standard. Electronic modules 32, 33 are respectively connected to each of the connectors 30. The specific structures of the circuit board 24, the electronic modules 32, 33, and their peripheral parts will be described later. Various electronic components such as a GPU (Graphics Processing Unit) and a memory can also be mounted on the circuit board 24. For the circuit board 24, for example, the Z1 side surface (the first surface 24a) becomes the assembly surface with respect to the first cover 20, and the Z2 side surface (the second surface 24b) becomes the mounting surface of the CPU 28 and the connectors 30. Of course, the shape, configuration, and mounted electronic components of the circuit board 24 are not limited to the above.

[0037] The cooling module 25 can absorb the heat generated by the CPU 28 and discharge it outside the housing 12. The cooling module 25 includes a heat pipe 34, a pair of radiators 35, 35, and a pair of fans 36, 36. The cooling module 25 can transfer the heat of the CPU 28 to each radiator 35 through the heat pipe 34 and promote the heat dissipation of each radiator 35 by the air flow from each fan 36.

[0038] The battery device 26 is a rechargeable battery that serves as the power source of the electronic device 10. The battery device 26 is disposed on the Y1 side of the circuit board 24 and extends in the X direction.

[0039] Next, a specific structural example of the circuit board 24 and the electronic modules 32, 33 will be described.

[0040] First, the circuit board 24 is a printed circuit board in which a specified conductive pattern is formed on the second surface 24b of a sheet having insulating properties. The circuit board 24 may also have a structure in which conductive patterns are formed on both surfaces 24a, 24b.

[0041] As Figure 2 shown, the circuit board 24 includes a pair of connectors 30, 30 and a pair of supports 40, 40, and supports the electronic modules 32, 33 through each connector 30 and each support 40. A pair of ground pads 41, 41 for fixing each support 40 are provided on the second surface 24b of the circuit board 24 (also refer to Figure 6)。The ground pad 41 is formed of, for example, a circular metal pattern. The metal pattern is, for example, a copper foil printed by screen printing. The circuit board 24 has, for example, a through hole 24c, and a ground pad 41 is formed at the peripheral portion on the second surface 24b side thereof.

[0042] The connector 30 is mounted on the second surface 24b. The mounting type of the connector 30 is not limited, and for example, a mounting type (Pcie Gen3: PCI Express 3.0) or an in-vehicle mounting type (Pcie Gen4: PCI Express 4.0) can be used.

[0043] Figure 3A is a perspective view of the support member 40. Figure 3B is a perspective view of the support member 40 as viewed from the back side. Figure 4 is an exploded perspective view of the support member 40. Figure 5A is a top view of the support member 40 set to the unlocked position. Figure 5B is to Figure 5A shown in the top view of the support member 40 set to the locked position. Figure 6 is a schematic side cross-sectional view of the electronic module 32 (33) supported by the support member 40. Here, the structure of supporting one electronic module 32 by the support member 40 is representatively described. The structure of supporting the other electronic module 33 by the support member 40 can be set to the same or similar structure as that of the electronic module 32, and thus the detailed description is omitted.

[0044] As Figures 3A - 6 shown, the support member 40 includes a stud member 42, a locking member 44, and a resistance member 46. The support member 40 is a locking member that can be switched between a locked position (closed position) and an unlocked position (open position) where the electronic module 32 can be supported by reversing the cam-shaped locking member 44 by 180 degrees. The rotation angle required for switching between the locked position and the unlocked position of the locking member 44 can be, for example, 90 degrees in addition to 180 degrees.

[0045] The stud member 42 is a metal member having a flange 42a and a protrusion 42b.

[0046] The flange 42a is a metal circular plate. The protrusion 42b is a cylindrical body integrally formed with the flange 42a and erected from the center of the flange 42a in the Z direction. A hole portion 42c is provided in the protrusion 42b along the axial center protruding direction. The hole portion 42c penetrates the stud member 42 in the axial direction (Z direction). The hole portion 42c is, for example, a stepped hole with a two-stage change in inner diameter. The portion of the hole portion 42c that opens from the Z2 side to the inside of the flange 42a is larger than the portion that opens from the Z1 side to the flange 42a (see Figure 6)。Thus, a flange-shaped edge portion 42c1 with a reduced inner peripheral surface diameter is formed at the Z1-side end of the hole portion 42c.

[0047] The locking member 44 is a metal member having a shaft portion 44a and a plate portion 44b. The stud member 42 and the locking member 44 can be formed of, for example, stainless steel, aluminum, copper, or brass.

[0048] The shaft portion 44a is a rotating shaft inserted into the hole portion 42c from the Z2-side opening. The shaft portion 44a is inserted into the hole portion 42c without wobbling and rotatably. The shaft portion 44a projects from the Z2-side surface of the plate portion 44b. A threaded hole 44a1 is formed in the shaft portion 44a along the axial direction (Z direction). The threaded hole 44a1 has an internal thread formed on its inner peripheral surface. The threaded hole 44a1 opens at the front end surface (Z1-side end surface) of the shaft portion 44a. An annular groove portion 44a2 is formed on the outer peripheral surface of the shaft portion 44a along the circumferential direction. The groove portion 44a2 has a shape in which the outer peripheral surface of the shaft portion 44a is cut into an arc shape, thereby forming a substantially annular groove. The groove portion 44a2 is formed at the root of the shaft portion 44a with respect to the plate portion 44b.

[0049] The plate portion 44b is integrally formed at the proximal end of the shaft portion 44a. The plate portion 44b can rotate about the axis of the protruding portion 42b together with the shaft portion 44a. The plate portion 44b has, for example, a shape in which two semi-circular metal plates (semicircular plates 44b1, 44b2) with different outer diameters are joined together. Thus, the plate portion 44b has a substantially cam shape or a substantially mushroom shape in plan view. The shaft portion 44a is formed to project toward the Z1 side from the small-diameter semi-circular plate 44b1. An operation Hole 44 b3. The operation hole 44b3 is, for example, a cross hole used when a tool such as a cross screwdriver is engaged to rotate the locking member 44. The large-diameter semi-circular plate 44b2 is provided to project from the outer peripheral surface of the shaft portion 44a in plan view. Thus, when the locking member 44 is rotated with respect to the stud member 42, the large-diameter semi-circular plate 44b2 rotates about the axis of the shaft portion 44a (see Figure 5A and Figure 5B ).

[0050] The locking member 44 fastens the screw 48 to the threaded hole 44a1 of the shaft portion 44a, and the shaft portion 44a is inserted into the hole portion 42c of the stud member 42. The screw 48 passes through the hole portion 42c from the back side of the flange 42a. The head 48a of the screw 48 clamps the edge portion 42c1 between the front end surface of the shaft portion 44a. The plate thickness of the edge portion 42c1 is slightly shorter than the distance between the head 48a of the screw 48 fastened to the threaded hole 44a1 and the front end surface (Z1-side end surface) of the shaft portion 44a. Thus, the locking member 44 is rotatably supported by the stud member 42 in a non-wobbly and anti-disengagement state.

[0051] The resistance member 46 constitutes a torque generating portion that imparts a rotational torque to the rotation of the locking member 44. The resistance member 46 is, for example, an O-ring. The resistance member 46 is inserted into the groove portion 44a2 of the shaft portion 44a and is assembled to the outer peripheral surface of the shaft portion 44a. The resistance member 46 is sandwiched between the Z1-side surface of the plate portion 44b and the Z2-side end surface of the protruding portion 42b and is in close contact with both. Thus, the resistance member 46 can generate a rotational resistance based on friction between the locking member 44 and the protruding portion 42b.

[0052] As Figure 6 shown, the resistance member 46 is in close contact with the inner peripheral surface of the groove portion 44a2 and the Z1-side surface of the plate portion 44b with respect to the locking member 44. The resistance member 46 is in close contact only with the front end surface of the protruding portion 42b with respect to the stud member 42. Therefore, the contact area of the resistance member 46 with the locking member 44 is significantly larger than its contact area with the stud member 42. That is, the frictional resistance between the resistance member 46 and the locking member 44 is greater than the frictional resistance between the resistance member 46 and the stud member 42. Therefore, when the locking member 44 rotates relative to the stud member 42, the resistance member 46 is in close contact with the locking member 44 and rotates integrally therewith, and its Z1-side surface slides on the front end surface of the protruding portion 42b. Thus, a situation where the resistance member 46 slides relative to both the locking member 44 and the protruding portion 42b and substantially no frictional resistance is generated is avoided. As a result, the support member 40 can more reliably generate a rotational torque between the locking member 44 and the protruding portion 42b.

[0053] Next, the electronic modules 32, 33 are card-type module members that can be connected to the connector 30 based on the M.2 standard as described above.

[0054] The electronic module 32 is, for example, a storage device. The electronic module 32 of the present embodiment is an SSD (Solid State Drive). As Figure 2 shown, the electronic module 32 has a module substrate 32a, terminals 32b formed at one end 32a1 of the module substrate 32a, and semiconductor chips 32c mounted on the module substrate 32a. When the terminals 32b of the electronic module 32 are connected to the connector 30, the other end 32a2 of the module substrate 32a is pressed in the Z direction by the support member 40. Thus, the electronic module 32 is mounted on the circuit board 24. A semi-circular cutout 32d (see Figure 4 ) capable of disposing the protruding portion 42b of the stud member 42 is formed at the center in the longitudinal direction of the other end 32a2.

[0055] Ground portions 32e, 32f are provided on one surface 32a3 and the other surface 32a4 of the module substrate 32a, respectively (see Figure 6)。The grounding portions 32e and 32f are metal patterns provided on the peripheral portion of the notch 32d, and are, for example, copper foils printed by screen printing.

[0056] The electronic module 33 is, for example, a communication module. The electronic module 33 of the present embodiment corresponds to a WWAN (Wireless Wide Area Network). The communication standard corresponding to the electronic module 33 may also be, for example, a WLAN (Wireless Local Area Network), etc. As Figure 2 shown, the electronic module 33 includes a module substrate 33a, terminals 33b formed at one end 33a1 of the module substrate 33a, and a semiconductor chip 33c mounted on the module substrate 33a. When the electronic module 33 is connected to the connector 30 at the terminals 33b, the other end 33a2 of the module substrate 33a is pressed by the support member 40 in the Z direction. Thus, the electronic module 33 is mounted on the circuit board 24. Cables 51 from antenna elements 50 provided at various locations on the housing 12 and the lid 11 are appropriately connected to the other end 33a2 of the electronic module 33.

[0057] The functions and size, etc. of the electronic module 33 are different from those of the electronic module 32, but the mounting structure with respect to the circuit board 24 can be made the same or similar. Therefore, a notch identical to the notch 32d of the electronic module 32 is also provided at the other end 33a2 of the electronic module 33. In addition, grounding portions identical to the grounding portions 32e and 32f of the module substrate 32a are also provided on one surface and the other surface of the module substrate 33a, respectively.

[0058] Next, the assembly method of the support member 40 and the support method of the electronic modules 32 and 33 based on the support member 40 will be described. Here, the support method of one electronic module 32 will be representatively described, and the support method of the other electronic module 33 can also be made the same or similar thereto.

[0059] As Figure 2 and Figure 6 shown, the support member 40 is fixed to the ground pad 41. For example, the bottom of the stud member 42 is inserted into the through hole 24c of the support member 40, and the flange 42a is placed on the ground pad 41 and a reflow soldering process is performed. Thus, the stud member 42 is fixed to the ground pad 41 and is mounted on the circuit board 24. The fixing of the stud member 42 can be performed, for example, simultaneously with the process of mounting the connector 30 and other mounting members on the circuit board 24 by reflow soldering.

[0060] Next, a washer 54 as a conductive member is passed through the outer peripheral surface of the protrusion 42b. The washer 54 is, for example, a conductive cushioning material. The washer 54 has a predetermined thickness, for example, and is formed in a substantially C shape. The washer 54 is disposed on the Z2 side of the flange 42a so as to grip the protrusion 42b.

[0061] Next, the shaft portion 44a of the locking member 44 in which the resistance member 46 is inserted into the groove portion 44a2 is inserted into the hole portion 42c of the protrusion 42b. A screw 48 is fastened to the threaded hole 44a1 to prevent the locking member 44 from coming off the stud member 42. Thus, the support member 40 is mounted on the circuit board 24.

[0062] The O-ring constituting the resistance member 46 may also be an O-ring formed of a heat-resistant material capable of withstanding the temperature of the reflow soldering process. In this way, the support member 40 can mount the stud member 42 on the circuit board 24 by reflow soldering as it is while the locking member 44 and the stud member 42 are connected by the screw 48 in advance. As a result, the manufacturing efficiency of the circuit board 24 is improved. The washer 54 may be provided after the support member 40 is mounted on the circuit board 24.

[0063] When the electronic module 32 is mounted on the circuit board 24 of the present embodiment, as Figure 5A shown, the locking member 44 of the support member 40 is set to the unlocked position. The unlocked position is a position where the large-diameter semi-circular plate 44b2 of the locking member 44 faces the side (X2 side) opposite to the side of the electronic module 32 (X1 side). At this time, since the locking member 44 receives the rotational torque from the resistance member 46, it can be reliably held in the unlocked position. Further, after the terminal 32b is connected to the connector 30, the other end 32a2 is placed near the support member 40 in the unlocked position. In this way, the cutout 32d is configured to surround the outer peripheral surface of the semi-circular protrusion 42b, and at the same time, the washer 54 is sandwiched between the grounding portion 32f of the other surface 32a4 and the flange 42a.

[0064] Next, as Figure 5BAs shown, the locking member 44 is rotated to the locking position by using a prescribed tool or the like. The locking position is the position where the large-diameter semi-circular plate 44b2 of the locking member 44 faces the electronic module 32 side (X1 side). At this time, the locking member 44 receives a rotational torque from the resistance member 46. Therefore, the locking member 44 can smoothly rotate from the unlocked position to the locking position with an appropriate rotational torque, obtaining a high operating feeling. Thus, one end 32a1 of the electronic module 32 is connected to the connector 30, and the other end 32a2 is supported by the support member 40 and mounted on the circuit board 24. In this case, the locking member 44 also receives a rotational torque from the resistance member 46, so that it can be reliably held in the locking position. In this way, the circuit board 24 can easily support the electronic module 32 using the support member 40, obtaining high work efficiency.

[0065] As Figure 6 shown, in a state where the electronic module 32 is mounted on the circuit board 24, the plate portion 44b of the locking member 44 contacts and is electrically connected to the grounding portion 32e of one surface 32a3. The grounding portion 32f of the other surface 32a4 of the electronic module 32 is electrically connected to the flange 42a via the washer 54. Thereby, the support member 40 can reliably electrically connect the grounding portions 32e and 32f to the grounding pad 41 of the circuit board 24. For example, the electronic module 32 may also have a single-sided grounding structure without the grounding portion 32f on the other surface 32a4. In this case, the washer 54 can also be omitted.

[0066] When removing the electronic module 32 from the circuit board 24, the locking member 44 is rotated to the Figure 5A unlocked position shown by using a prescribed tool or the like. In this way, the electronic module 32 is released based on the pressing of the locking member 44. As a result, the electronic module 32 receives the acting force at the connection portion between the connector 30 and the terminal 32b and the repulsive force of the washer 54, and with one end 32a1 as the rotation fulcrum, the other end 32a2 floats toward the Z2 side. Thereby, the electronic module 32 can be easily removed from the circuit board 24.

[0067] As described above, the circuit board 24 of the present embodiment is provided with the support member 40 that supports the other end 32a2 (33a2) on the side opposite to the connector 30 side of the electronic module 32 (33). The support member 40 includes a stud member 42 having a flange 42a fixed to the circuit board 24 and a protruding portion 42b erected from the flange 42a. The support member 40 further includes: a locking member 44 that is rotatably supported by the protruding portion 42b and can be switched between a locking position where it presses the other end 32a2 (33a2) of the electronic module 32 (33) and an unlocked position where it does not press; and a resistance member 46 that constitutes a torque generating portion that imparts a rotational torque to the rotation of the locking member 44.

[0068] Therefore, the circuit board 24 and the electronic device 10 on which the circuit board is mounted do not require screws for supporting the electronic modules 32 and 33 on the circuit board 24, and the workability of the disassembly and assembly operations of the electronic modules 32 and 33 is improved. In particular, for an electronic device 10 such as a notebook PC, not only during operations in a factory or the like, but also sometimes the user himself / herself replaces the electronic modules 32 and 33. In such a case, the electronic device 10 can also reduce the risk of screws falling off or getting lost, and thus the maintainability and expandability are further improved.

[0069] Moreover, the support member 40 imparts a rotational torque to the rotation of the locking member 44. Therefore, the locking member 44 can be stably held at any one of the rotational positions of the locked position and the unlocked position. When the locking member 44 is held in the locked position, the workability of the disassembly and assembly operations of the electronic modules 32 and 33 with respect to the support member 40 is further improved. When the locking member 44 is held in the unlocked position, the support member 40 can stably support the electronic modules 32 and 33 further. The reason is that, for example, even when the circuit board 24 is impacted due to the dropping of the electronic device 10 or the like, the situation where the locking member 44 is erroneously rotated to the unlocked position can be suppressed.

[0070] In the support member 40, by fastening the screw 48 from the back side of the flange 42a to the front end of the shaft portion 44a inserted into the hole portion 42c, the locking member 44 is prevented from coming off the stud member 42. As described above, there are also cases where the user himself / herself disassembles and assembles the electronic modules 32 and 33. Therefore, the support member 40 may also have problems such as the operation hole 44b3 of the locking member 44 being damaged by a tool or the resistance member 46 as an O-ring being cut off. At this time, the support member 40 can easily disassemble and assemble the locking member 44 from the stud member 42 by operating the screw 48. Therefore, when such a problem occurs in the support member 40 as described above, the circuit board 24 and the electronic device 10 do not need to replace the entire circuit board 24 on which the stud member 42 is mounted. Therefore, the circuit board 24 and the electronic device 10 have high maintainability and low maintenance costs.

[0071] Figure 7 It is a perspective view of the support member 40A according to the first modification. Figure 8 It is composed of Figure 7 The schematic side cross-sectional view of the electronic module 32 (33) supported by the support member 40A shown. Figure 9 It is Figure 7 The exploded perspective view of the support member 40A shown. In Figures 7 - 9 Among them, the same reference numerals as those shown in Figures 1 - 6 represent the same or similar structures, so the detailed description is omitted as they perform the same or similar functions and effects. The same applies to the following Figures 10A - 14 as well.

[0072] Figures 7 - 9 The shown support member 40A has a stud member 42A, a locking member 44A, and a resistance member 46A that are different from the stud member 42, the locking member 44, and the resistance member 46 of the shown support member 40. Figures 3A - 6 The stud member 42A has a protrusion 60 and a hole portion 61. The outer diameter of the protrusion 60 is smaller than that of the protrusion 42b. A groove portion 44a2 is not provided on the outer peripheral surface of the protrusion 60. The shape of the hole portion 61 is different from that of the hole portion 42c. The hole portion 61 has a countersunk hole portion 61a in which the inner diameter of the portion opening to the Z1 side surface is enlarged compared to other portions.

[0073] The locking member 44A has a shaft portion 62 with an outer diameter smaller than that of the shaft portion 44a. The shaft portion 62 has a cylindrical shape and does not form a threaded hole 44a1. As

[0074] shown, in a state before connecting the locking member 44A to the stud member 42A, a standing wall 62a is formed at the front end portion (Z2 side end portion) of the shaft portion 62. The standing wall 62a is a cylindrical wall portion with a shallow recess formed at the center. As Figure 9 shown, the standing wall 62a is deformed by riveting after the shaft portion 62 is inserted through the hole portion 61 and becomes a riveted portion 62a. The riveted portion 62a replaces the screw 48. That is, the riveted portion 62a prevents the locking member 44A from falling off in a state where it can rotate relative to the stud member 42A. The locking member 44A has a blocking protrusion 63 on the back surface (Z1 side surface) of the semi-circular plate 44b2 of the plate portion 44b. The blocking protrusion 63 is, for example, an arc-shaped standing wall. Figure 8 The resistance member 46A constitutes a torque generating portion that imparts a rotational torque to the rotation of the locking member 44A. Different from the resistance member 46 formed of an O-ring, the resistance member 46A is a leaf spring formed by molding a metal plate into a C-ring shape. The resistance member 46A has an opening portion 65 and a blocking recess 66.

[0075] The opening portion 65 corresponds to the opening of the C character. The inner diameter of the resistance member 46A is smaller than the outer diameter of the shaft portion 62. The resistance member 46A can be elastically deformed in an open C shape via the opening portion 65 and fitted onto the outer peripheral surface of the shaft portion 62. Thus, the resistance member 46A is rotatably mounted on the outer peripheral surface of the shaft portion 62 with a prescribed rotational torque.

[0076] The opening portion 65 corresponds to the opening of the C character. The inner diameter of the resistance member 46A is smaller than the outer diameter of the shaft portion 62. The resistance member 46A can be elastically deformed in an open C shape via the opening portion 65 and fitted onto the outer peripheral surface of the shaft portion 62. Thus, the resistance member 46A is rotatably mounted on the outer peripheral surface of the shaft portion 62 with a prescribed rotational torque.

[0077] The blocking recess 66 is a notch-shaped recess formed in the end face on the Z2 side of the resistance member 46A. The blocking recess 66 is on the side opposite to the opening 65 in the diameter direction of the resistance member 46A. The blocking convex portion 63 of the locking member 44A is fitted into the blocking recess 66. Thereby, the locking member 44A can relatively rotate integrally with the resistance member 46A with respect to the outer peripheral surface of the protruding portion 60 of the stud member 42A.

[0078] Next, a method of mounting the support member 40A and a method of supporting the electronic modules 32 and 33 based on the support member 40A will be described.

[0079] As Figure 8 shown, in the support member 40A, a method of fixing the stud member 42A to the ground pad 41 and mounting it on the circuit board 24 can also be carried out in the same manner as in the case of the above-described support member 40.

[0080] First, the resistance member 46A is fitted onto the outer peripheral surface of the protruding portion 60 of the stud member 42A in the support member 40A. Next, the shaft portion 62 of the locking member 44A is inserted through the hole portion 61. At this time, the blocking convex portion 63 is fitted into the blocking recess 66. Next, riveting is performed on the vertical wall 62a at the front end of the shaft portion 62 passing through the hole portion 61 to form a riveted portion 62a. Thereby, the locking member 44A is prevented from falling off the stud member 42A, and the assembly of the support member 40A is completed. The entire support member 40A is composed of metal parts. Therefore, the support member 40A can also be easily mounted on the circuit board 24 by reflow soldering after the locking member 44A is assembled to the stud member 42A.

[0081] The method of supporting the electronic modules 32 and 33 based on the support member 40A can be carried out in the same manner as Figure 5A and Figure 5B shown in the method of supporting the electronic modules 32 and 33 based on the support member 40. Therefore, a detailed description is omitted. That is, in the case of the support member 40A, the rotational torque from the resistance member 46A can also be received, and the locking member 44A can be rotated from the unlocked position to the locked position. Therefore, in the circuit board 24 and the electronic device 10 including the support member 40A, the workability of the disassembly and assembly operations of the electronic modules 32 and 33 is also improved, and the stable support can be performed.

[0082] In the support member 40A, the screw 48 can also be used instead of the riveted portion 62a. In addition, in the above-described support member 40A and the support members 40B to 40D described later, the riveted portion 62a can also be used instead of the screw 48. In the structure using the screw 48, assuming that the riveted portion 62a is damaged, the locking member 44 etc. can be easily replaced.

[0083] Figure 10AIt is a perspective view of the support member 40B and the positioning member 70 according to the second modification example. Figure 10B It is a perspective view of the support member 40B viewed from another angle. Figure 10A It is a perspective view of the support member 40B shown in the figure. Figure 11A It is a top view showing the support member 40B shown in the figure Figure 10A in the unlocked position. Figure 11B It is a top view showing the support member 40B shown in the figure Figure 11A in the locked position. Figure 12 It is a schematic side cross-sectional view of the electronic module 32(33) supported by the support member 40B shown in the figure Figure 10A from the side.

[0084] Figures 10A - 12 The support member 40B shown in the figure has a locking member 44B with a structure different from that of the locking member 44 of the support member 40 shown in the figure. The support member 40B is used together with the positioning member 70. Figures 3A - 6 shown in the figure.

[0085] The locking member 44B has a shaft portion 72 with a structure different from that of the shaft portion 44a. The shaft portion 72 is a stepped shaft having a large-diameter portion 72a on the Z2 side and a small-diameter portion 72b on the Z1 side. The large-diameter portion 72a is formed to have the same diameter as the semi-circular plate 44b1 of the plate portion 44b and projects in the Z1 direction in a continuous manner from the semi-circular plate 44b1. The small-diameter portion 72b has the same diameter as the shaft portion 44a and is the portion inserted into the hole portion 42c of the stud member 42.

[0086] A groove portion 44a2 is not provided on the outer peripheral surface of the shaft portion 72. A pair of concave portions 74a, 74b are formed on the outer peripheral surface of the large-diameter portion 72a of the shaft portion 72. The concave portions 74a, 74b are longitudinal grooves extending in the axial direction (Z direction) of the large-diameter portion 72a. The concave portions 74a, 74b are arranged on the outer peripheral surface of the shaft portion 72 on opposite sides at 180 degrees. Taking the diameter direction of the large-diameter portion 72a as a reference, the concave portion 74a is arranged on the side of the small-diameter semi-circular plate 44b1, and the concave portion 74b is arranged on the side of the large-diameter semi-circular plate 44b2.

[0087] The positioning member 70 is a metal plate member that is substantially L-shaped when viewed from the side. The positioning member 70 is mounted on the second surface 24b of the circuit board 24 and selectively positions the locking member 44B in the locked position and the unlocked position by abutting against the locking member 44B. The positioning member 70 has a fixing portion 70a, a spring portion 70b, and a convex portion 70c. The positioning member 70 can be formed of, for example, stainless steel, aluminum, copper, or brass.

[0088] The fixing portion 70a is a plate that is substantially U-shaped when viewed from above. The fixing portion 70a is fixed to the ground pad 41 (refer to Figure 12)。That is to say, the positioning member 70 can be mounted on the circuit board 24 simultaneously with the process of mounting the stud member 42, the connector 30, etc. on the circuit board 24 by reflow soldering. When observed from the stud member 42, the positioning member 70 is arranged on the side opposite to the electronic modules 32 and 33 side (X1 side) (X2 side).

[0089] The spring portion 70b is bent and erected from the fixing portion 70a toward the Z2 side. The spring portion 70b is formed in a substantially arched shape as a whole, for example. The spring portion 70b is a leaf spring that extends along the Y direction and can be elastically deformed at least in the X direction.

[0090] The convex portion 70c is provided at the center in the longitudinal direction of the spring portion 70b and is a dome-shaped small protrusion that protrudes toward the support member 40B side. The front end of the convex portion 70c is always pressed and contacted against the outer peripheral surface of the large-diameter portion 72a by the acting force of the spring portion 70b. When the locking member 44B rotates, the convex portion 70c can be selectively engaged with one of the recesses 74a and 74b formed on the outer peripheral surface of the shaft portion 72.

[0091] Next, the mounting method of the support member 40B and the supporting method of the electronic modules 32 and 33 based on the support member 40B will be described. Here, the supporting method of one electronic module 32 will be described representatively, and the supporting method of the other electronic module 33 can be the same or similar thereto.

[0092] As Figure 12 shown, in the support member 40B, the method of fixing the stud member 42 to the ground pad 41 and mounting it on the circuit board 24 can also be carried out in the same manner as in the case of the above-described support member 40. Except that the support member 40B does not have the resistance member 46 as an O-ring, the assembling method of the locking member 44B with respect to the stud member 42 can also be carried out in the same manner as in the case of the above-described support member 40.

[0093] When mounting the electronic module 32 on the circuit board 24 using the support member 40B, as Figure 11A shown, the locking member 44B of the support member 40B is set to the unlocked position. At this time, the locking member 44B engages the convex portion 70c of the positioning member 70 with one of the recesses 74b of the shaft portion 72. Therefore, although the support member 40B does not have the resistance member 46 like the above-described support member 40, it can also be reliably held in the unlocked position.

[0094] Next, after connecting the terminal 32b to the connector 30 and placing the other end 32a2 near the support member 40B in the unlocked position, the locking member 44B is rotated and operated. That is, as Figure 11BAs shown, the locking member 44B is rotated to the locking position by using a prescribed tool or the like. At this time, after the convex portion 70c is disengaged from the concave portion 74b due to the elastic deformation of the spring portion 70b, it slides on the outer peripheral surface of the large-diameter portion 72a. When the locking member 44B is rotated by 180 degrees, the convex portion 70c engages with the other concave portion 74a this time, generating a click feeling. Therefore, the support member 40B can obtain an appropriate click feeling and reliably position and hold the locking member 44B in the locking position. Thus, one end 32a1 of the electronic module 32 is connected to the connector 30, and the other end 32a2 is supported by the support member 40B and mounted on the circuit board 24.

[0095] When removing the electronic module 32 from the circuit board 24, the locking member 44B is rotated to the Figure 11A unlocking position shown by using a prescribed tool or the like. In this case, the convex portion 70c is also disengaged from the concave portion 74a due to the elastic deformation of the spring portion 70b and then engages with the concave portion 74b again, generating an appropriate click feeling. As a result, the electronic module 32 can be easily removed from the circuit board 24.

[0096] Therefore, in such a support member 40B, the locking member 44B can also be rotated from the unlocking position to the locking position and held at each position. Therefore, in the circuit board 24 and the electronic device 10 provided with the support member 40B, the workability of the disassembly and assembly operations of the electronic modules 32 and 33 is also improved, and the stable support can be performed.

[0097] When the convex portion 70c moves between the concave portions 74a and 74b, the support member 40B slides on the outer peripheral surface of the shaft portion 72 under the action of the spring portion 70b. Therefore, although rare in the case of the support member 40B, a rotational torque is also imparted to the rotation of the locking member 44B. Among them, the convex portion 70c and the shaft portion 72 are both metal components and easily slide relative to each other, so the rotational torque is extremely small. Therefore, the positioning structure of the locking member 44B using the positioning member 70 can also be configured to obtain sufficient rotational torque by using it together with the following support members 40C and 40D.

[0098] Figure 13 is a schematic side cross-sectional view in which the electronic module 32 (33) is supported by the support member 40C according to the third modification.

[0099] Figure 13 The support member 40C shown compared with Figures 10A - 12 the support member 40B shown is different in that a resistance member 46 is assembled to the shaft portion 72. The shaft portion 72 of the support member 40C has a groove portion 44a2 on the outer peripheral surface at the root of the small-diameter portion 72b relative to the large-diameter portion 72a. The resistance member 46, which is an O-ring, is fitted in the groove portion 44a2.

[0100] In the support member 40C, the locking member 44B can also be positioned at the locking position and the unlocking position by the positioning member 70, and an appropriate click feeling can be obtained during the rotation operation. Moreover, the support member 40C imparts sufficient rotational torque to the rotation of the locking member 44B through the resistance member 46. Therefore, compared with the support member 40B, the operability during the rotation operation of the locking member 44B is further improved, and the holding stability at the locking position and the unlocking position is also improved.

[0101] Figure 14 It is a perspective view of the support member 40D and the positioning member 70 according to the fourth modification.

[0102] Figure 14 The shown support member 40D is Figures 10A - 12 compared with the shown support member 40B, and the difference is that a resistance portion 76 is provided on the outer peripheral surface of the large-diameter portion 72a of the shaft portion 72. In Figure 14 , the illustration of the stud member 42 is omitted. The resistance portion 76 is a concavo-convex shape or a spline groove formed at equal intervals in the circumferential direction on the outer peripheral surface of the large-diameter portion 72a. The depth of the groove of the resistance portion 76 is shallower and narrower than the concave portions 74a and 74b, and the convex portion 70c is a shape that cannot be fully engaged.

[0103] In the support member 40D, when the locking member 44B rotates, the convex portion 70c of the positioning member 70 continuously contacts the concavo-convex of the resistance portion 76, so rotational resistance and a rotational operation feeling are imparted to the locking member 44B. That is, the resistance portion 76 and the convex portion 70c function as a torque generating portion that imparts rotational torque to the rotation of the locking member 44B. Therefore, compared with the support member 40B, the operability during the rotation operation of the locking member 44B is further improved. The resistance portion 76 can also be formed, for example, by providing a rubber sheet or surface treatment on the outer peripheral surface of the shaft portion 72 that imparts frictional resistance to the convex portion 70c. The resistance portion 76 can also be used simultaneously with Figure 13 the shown resistance member 46.

[0104] In addition, the present invention is not limited to the above-described embodiments, and of course, can be freely changed without departing from the gist of the present invention.

Claims

1. A circuit board, on which a connector connecting one end of an electronic module and a support member supporting the other end of the electronic module are mounted, characterized in that, the support member comprises: a stud member having a flange fixed to the surface of the circuit board and a protrusion erected from the flange; a locking member rotatably supported relative to the protrusion and capable of switching between a locking position for pressing the other end of the electronic module and an unlocking position for not pressing the other end; and a torque generating portion for imparting a rotational torque to the rotation of the locking member.

2. The circuit board according to claim 1, characterized in that, the torque generating portion includes a resistance member that generates a rotational resistance between the locking member and the protrusion.

3. The circuit board according to claim 2, characterized in that, the protrusion has a hole portion along the protruding direction, the locking member has: a shaft portion rotatably inserted into the hole portion; and a plate portion provided at one end of the shaft portion and capable of supporting the electronic module by rotating to the locking position and the unlocking position, the resistance member is an O-ring fitted on the outer peripheral surface of the shaft portion and sandwiched between the plate portion and the front end surface of the protrusion.

4. The circuit board according to claim 3, characterized in that, a ring-shaped groove portion is formed on the outer peripheral surface of the shaft portion, the O-ring is fitted into the groove portion.

5. The circuit board according to claim 3 or 4, characterized in that, by fastening a screw from the back side of the flange to the front end portion of the shaft portion inserted into the hole portion, the shaft portion is prevented from falling off the stud member.

6. The circuit board according to claim 1 or 2, characterized in that, a positioning member is provided, which is mounted on the surface of the circuit board and can selectively position the locking member at the locking position and the unlocking position by abutting against the locking member.

7. The circuit board according to claim 6, characterized in that, the protrusion has a hole portion along the axial direction, the locking member has: a shaft portion rotatably inserted into the hole portion; and a plate portion provided at one end of the shaft portion and capable of supporting the electronic module by rotating to the locking position and the unlocking position, a pair of recesses are formed on the outer peripheral surface of the shaft portion and are arranged on opposite sides at 180 degrees, the positioning member has: a convex portion that can selectively engage with one of the pair of recesses when the locking member is rotated; and a spring portion that presses the convex portion against the outer peripheral surface of the shaft portion.

8. The circuit board according to claim 7, characterized in that, the torque generating portion includes a resistance portion provided on the outer peripheral surface of the shaft portion and contacting the convex portion when the locking member is rotated, thereby imparting a rotational resistance to the locking member.

9. An electronic device, characterized in that, Comprising: a circuit board on which a connector is mounted; an electronic module, one end of which is connected to the connector; and a support member that supports the other end of the electronic module on the circuit board, the support member comprises: A stud member having a flange fixed to the surface of the circuit board and a protrusion erected from the flange; A locking member rotatably supported by the protrusion and capable of switching between a locking position for pressing the other end of the electronic module and an unlocking position for not pressing the other end; And A torque generating portion that imparts rotational torque to the rotation of the locking member.

10. The electronic device according to claim 9, wherein The torque generating portion includes a resistance member that generates rotational resistance between the locking member and the protrusion.

11. The electronic device according to claim 10, wherein The protrusion has a hole portion along the axial direction, The locking member has: A shaft portion rotatably inserted into the protrusion; And A plate portion provided at one end of the shaft portion and capable of supporting the electronic module by rotating to the locking position and the unlocking position, The resistance member is an O-ring fitted on the outer peripheral surface of the shaft portion and sandwiched between the plate portion and the front end surface of the protrusion.

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