JP2020046238A - Electronic device - Google Patents

Abstract

To enable a pressure sensor to be arranged in proximity to a circuit board 21, as well as ensure that a terminal is not placed out of a terminal contact face 37a by vibration, etc.SOLUTION: A toric land member 35 is attached to a circuit board 21, and a disk- shaped electrode member 37 is secured by caulking in the inside of an opening 36 of the land member 35. The electrode member 37 is previously plated with gold. The thickness of the electrode member 37 is smaller than the plate thickness of the circuit board 21, and a terminal contact face 37a is retracted from the surface 21a of the circuit board 21. To a surface 21b on the reverse side are soldered the electrode member 37 and the land member 35 via a solder layer 38. As the terminal of a pressure sensor comes in contact with the terminal contact face 37a, electrical connection between the circuit board 21 and the pressure sensor is established.SELECTED DRAWING: Figure 10

Description

  The present invention relates to an electronic device having a circuit board, and more particularly to an electronic device in which a terminal of an electric component such as a sensor contacts an electrode portion provided on the circuit board to make an electrical connection.

  Patent Literature 1 discloses a brake fluid in which an electrode portion made of a metal member called a pad is provided on a circuit board, and a terminal of a pressure sensor is pressed against the electrode portion to achieve an electrical connection between the sensor and the circuit board. A pressure control device is disclosed. The pad is made of a square metal plate, and is joined via a solder layer to a similar square land formed on the surface of the circuit board.

  The pressure sensor has a plurality of terminals, and a plurality of electrode units are provided on the circuit board so as to correspond to the plurality of terminals individually. The terminals are not soldered to the electrode portions, but are simply connected to make electrical connection.

JP-A-2015-162543

  In the conventional configuration in which the pad is attached to the circuit board as described above, the electrode portion protrudes from the surface of the circuit board by the thickness of the pad and the thickness of the solder layer. Therefore, an electric component (for example, a pressure sensor) disposed on the electrode portion is located farther from the circuit board, and the external dimensions of the electronic device including the electric component are increased.

  In addition, when the terminals of the electric component move in the direction along the surface of the circuit board due to vibration or the like applied from the outside, the terminals can be easily moved without being restrained on the electrode portion. May fall off from above the electrode portion to the outside.

  According to the present invention, in one embodiment, the electrode portion is provided within a range of the thickness of the circuit board, and the terminal contact surface is located retreating from the surface of the circuit board.

  Alternatively, in another aspect, the circuit board is provided with an opening formed of a concave portion or a through hole, and the electrode portion is disposed in the opening, and the terminal contact surface is formed in a predetermined shape of the opening. Located at a depth of.

  In such a configuration, since the terminal contact surface is recessed from the surface of the circuit board, the position of the electric component is closer to the circuit board. This is advantageous in reducing the size of an electronic device including electric components.

  In addition, the periphery of the terminal contact surface is surrounded by the circuit board, and the movement of the terminal is restricted.

1 is an external perspective view of a brake fluid pressure control device to which the present invention is applied. The front view which looked at the whole brake fluid pressure control apparatus from the controller side. FIG. 3 is a sectional view taken along the line AA in FIG. 2. FIG. 4 is an enlarged sectional view of a portion B in FIG. 3. FIG. 3 is a perspective view of a hydraulic block from which a controller is removed. The front view of a hydraulic block. Sectional drawing along CC line of FIG. The expanded sectional view of the D section of FIG. The figure which looked at the controller from the mounting surface side of the hydraulic block. FIG. 3 is a cross-sectional view of an electrode portion according to the first embodiment. FIG. 3 is a perspective view of three electrode units of the first embodiment. FIG. 9 is a sectional view of an electrode portion according to a second embodiment. Sectional drawing of the electrode part part of 3rd Example. Sectional drawing of the electrode part part of 4th Example. FIG. 14 is a perspective view of three electrode units of the fourth embodiment.

  An embodiment in which the present invention is applied to a brake fluid pressure control device for a vehicle will be described below.

  FIG. 1 is a perspective view showing the overall appearance of the brake fluid pressure control device, and FIG. 2 is a front view. FIG. 3 is a cross-sectional view taken along line AA of FIG. 2, and FIG. 4 is an enlarged cross-sectional view of a portion B of FIG. This brake fluid pressure control device is interposed between a master cylinder of a vehicle and a wheel cylinder of each wheel, and controls a brake fluid pressure supplied to a wheel cylinder of each wheel based on a wheel speed or the like. . The brake fluid pressure control device is formed in a box shape from a fluid pressure block 1 in which a fluid pressure passage 7 serving as a part of a brake pipe is formed, and a body 3 and a cover 4. And an electric motor 5 attached to the other surface of the hydraulic block 1 (that is, the surface opposite to the controller attachment surface).

  The electric motor 5 drives a plunger pump (not shown) disposed inside the hydraulic block 1. In order to increase and decrease the brake fluid pressure supplied to each wheel using this plunger pump, a plurality (for example, 15) of solenoid valves are provided across the hydraulic block 1 and the body 3 of the controller 2. 8 are provided. As shown in FIG. 3, the solenoid valve 8 is composed of a valve body 8A inserted into the valve insertion hole 9 of the hydraulic block 1 and a coil assembly 8B for driving the valve body 8A in the axial direction. The coil assembly 8 </ b> B is arranged on the controller 2 side, more specifically, on the bottom wall 15 side of the body 3. Around these solenoid valves 8, pressure sensors 11 are provided at three locations to detect the fluid pressure of each part. In the present embodiment, the pressure sensor 11 corresponds to an “electric component” in the claims. The plurality of solenoid valves 8 include a normally-open solenoid valve and a normally-closed solenoid valve, but here, it is assumed that the two are not particularly distinguished.

  5 is a perspective view of the hydraulic block 1, FIG. 6 is a front view of the hydraulic block 1, FIG. 7 is a cross-sectional view taken along line CC of FIG. 6, and FIG. FIG. The hydraulic block 1 is formed in a block shape from a metal, for example, an aluminum alloy. A hydraulic passage 7 is formed in a predetermined circuit inside, and a plurality of hydraulic ports 6 are provided on a side surface. The plurality of hydraulic ports 6 are connected to hydraulic piping leading to a wheel cylinder or the like. As shown in FIG. 6, fifteen valve bodies 8A (solenoid valves 8) are arranged in the hydraulic block 1, and these valve bodies 8A are provided with a controller to which the controller 2 is attached as shown in FIG. It protrudes from the mounting surface 1a.

  The pressure sensor 11 detects the hydraulic pressure of each part in the hydraulic circuit in the hydraulic block 1 and outputs a detection signal to the controller 2, and as shown in FIG. It is located at the place. These pressure sensors 11 are attached to the hydraulic block 1 and protrude from the controller mounting surface 1a of the hydraulic block 1 as shown in FIGS. In other words, the substantially columnar pressure sensor 11 stands from the controller mounting surface 1a toward the controller 2. As shown in FIG. 8, three terminals 12 made of a conductive metal piece are arranged at one end serving as the tip of the pressure sensor 11 standing up as described above. As shown in FIG. 8, these terminals 12 are formed in a substantially U-shape so as to have a spring property. The three terminals 12 are arranged at equal intervals, that is, at every 120 ° on the circular end face of the pressure sensor 11 (see FIGS. 5 and 6).

  The body 3 of the controller 2 is formed by using, for example, a hard synthetic resin, and as shown in FIG. 3, a bottom wall which is recessed with respect to a block-side flange portion 14 which is a mounting surface with the hydraulic block 1. 15 and a cover side flange 16 to which the cover 4 is attached on the periphery. The cover 4 is made of, for example, a press-formed product of a metal plate or die-cast of an aluminum alloy, and is attached to the cover-side flange portion 16 so as to cover the entire bottom wall 15 surrounded by the cover-side flange portion 16. I have.

  The bottom wall 15 of the body 3 is separated from the controller mounting surface 1a of the hydraulic block 1, and the coil assembly 8B is disposed between the two. In other words, a plurality of coil assemblies 8B are accommodated in a space formed on the inner peripheral side of the block-side flange portion 14 of the body 3 that is in contact with the hydraulic block 1. FIG. 9 shows the body 3 of the controller 2 with the hydraulic block 1 removed. As shown in FIG. 9, a total of 15 coil assemblies 8B are arranged on the inner peripheral side of the block side flange portion 14. Have been. A connector for supplying power to the hydraulic pressure control device and transmitting / receiving signals to / from a vehicle-side control system is provided on one side of the body 3 which protrudes laterally from the block-side flange portion 14. 18 are integrally formed (see FIGS. 9 and 1).

  As shown in FIGS. 3 and 4, a circuit board 21 on which an electric circuit necessary for hydraulic pressure control is formed is housed inside the controller 2 including the body 3 and the cover 4. The circuit board 21 is a flat so-called printed wiring board using a resin substrate such as a glass epoxy resin, a metal substrate, or the like, and is disposed substantially parallel to the bottom wall 15 of the body 3. An appropriate space is provided between the bottom wall 15 and the bottom wall 15. Many electronic components (not shown) are mounted on the circuit board 21. Also, the terminals 22 of the coil assembly 8B are soldered to the circuit board 21 after penetrating through holes of the circuit board 21 (see FIG. 3). By this soldering, the coil assembly 8B is fixed to the body 3 side.

  As shown in FIGS. 3 and 4, a substantially cylindrical sensor support hole 23 into which the distal end portion of the pressure sensor 11 fits is provided at three positions of the body 3 for the pressure sensor 11 rising from the hydraulic pressure block 1. Is formed. These sensor support holes 23 penetrate the bottom wall 15 of the body 3. The distal end of the pressure sensor 11 penetrates the sensor support hole 23, and the terminal 12 at the distal end reaches the circuit board 21. The terminal 12 is in contact with an electrode portion 31 on a circuit board 21, which will be described in detail later, and thereby electrically connects to a circuit on the circuit board 21 side. More specifically, the dimensional relationship of each part is set such that the terminal 12 having the spring property is pressed against the electrode part 31 with an appropriate pressing force when the hydraulic block 1 is attached to the body 3.

  As shown in FIG. 9, three electrode portions 31 are provided for each pressure sensor 11 corresponding to the positions of the terminals 12 in the pressure sensor 11, and are arranged at equal intervals of 120 °. I have.

  In the brake fluid pressure control device having the above-described configuration, at the time of assembling, after the fluid pressure block 1 and the controller 2 are separately assembled, the two are finally integrated. That is, after mounting the circuit board 21 inside the controller 2 and temporarily fixing the coil assembly 8B to the body 3, the terminals 22 of the coil assembly 8B are soldered to the circuit board 21 by, for example, a reflow soldering method. At the same time, a large number of electronic components mounted on the circuit board 21 are soldered. The controller 2 shown in FIG. 9 corresponds to the state assembled in this way. On the other hand, the pressure sensor 11 is attached to the hydraulic block 1 and the valve elements 8A constituting the solenoid valve 8 are assembled in the valve insertion holes 9 respectively. FIG. 5 shows the hydraulic block 1 assembled in this way. Next, the hydraulic block 1 and the controller 2 are assembled while performing positioning so that the pressure sensor 11 enters the sensor support hole 23 of the body 3 and fixed to each other by bolts (not shown) (see FIG. 3).

  By assembling the hydraulic block 1 and the controller 2 in this manner, the terminal 12 of the pressure sensor 11 is pressed against the electrode section 31, and an electrical connection is made between the pressure sensor 11 and the circuit board 21.

  Next, the configuration of the electrode unit 31 will be described. FIG. 10 is an enlarged cross-sectional view of a main part of the first embodiment of the electrode unit 31. The up and down directions in FIG. 10 correspond to the up and down directions in FIGS. 3 and 4 and the like. The lower side in FIG. 10 is the hydraulic block 1 side and the upper side is the cover 4 side. FIG. 11 is an external perspective view of the three electrode portions 31. FIG. 11 shows the circuit board 21 of FIG. As shown in FIG. 11, the three electrode portions 31 are arranged so as to be located at the vertices of an equilateral triangle, respectively, corresponding to the arrangement of the three terminals 12 of the pressure sensor 11 described above. Each of the three terminals 12 of the pressure sensor 11 comes into contact with the corresponding electrode portion 31. FIG. 10 shows one of the three electrode units 31 arranged as shown in FIG.

  In the embodiment of FIG. 10, the circuit board 21 is a multilayer board including a plurality of insulating material layers 32 and a plurality of metal foil layers, for example, a copper foil layer 33, and includes, for example, six copper foil layers 33. . These copper foil layers 33 are formed in a desired wiring pattern by an appropriate etching method or the like. An annular land member 35 having conductivity is provided at a predetermined position on the circuit board 21.

  The land member 35 is made of, for example, copper, and is attached to the circular hole provided in the circuit board 21 by a non-pressed buttressed stopper. The pair of end surfaces 35a and 35b of the land member 35 form a plane substantially continuous with the pair of surfaces 21a and 21b of the circuit board 21. The land member 35 is electrically connected to a wiring pattern formed of at least one of the copper foil layers 33. An opening 36 penetrating from one surface 21a of the circuit board 21 to the other surface 21b is formed by the inner peripheral cylindrical surface 35c of the land member 35 having an annular shape. An electrode member 37, which is a separate member, is fitted into the opening 36, and the electrode member 31 forms the electrode portion 31. The electrode member 37 is made of a disc-shaped copper, and the entire outer surface thereof is plated with gold in advance. The electrode member 37 is formed to have a slightly smaller diameter than the inner diameter of the opening 36, and as a so-called “crimping stop”, a load is applied from above and below to the electrode member 37 disposed in the opening 36 to increase the diameter in the radially increasing direction. By being slightly deformed, it is firmly fixed in the opening 36. The electrode member 37 is formed, for example, by punching a copper plate in a circular shape.

  The thickness of the electrode member 37 in the assembled state is smaller than the thickness of the circuit board 21, and the end surface 37 b on the opposite side to the pressure sensor 11 in the opening 36 is flat with the end surface 35 b of the land member 35. It is fixed in a state that makes it easy. Therefore, the other end surface of the electrode member 37 with which the terminal 12 of the pressure sensor 11 contacts, that is, the terminal contact surface 37a is receded from the surface 21a of the circuit board 21 on the pressure sensor 11 side. In other words, the terminal contact surface 37 a is located at a predetermined depth in the opening 36 formed by the land member 35.

  On the surface 21 b of the circuit board 21 opposite to the pressure sensor 11, a solder layer 38 is provided over the end surface 35 b of the land member 35 and the end surface 37 b of the electrode member 37 which form one continuous surface. . The solder layer 38 is formed by, for example, a reflow soldering method in which a solder paste is applied so as to cover the land member 35 and the electrode member 37, and the solder paste is heated and melted in a reflow furnace. By soldering the electrode member 37 and the land member 35 to each other in this manner, the electrical connection between them is ensured, and the electrode member 37 is securely fixed. In particular, when a slight gap is formed at the boundary between the outer peripheral edge of the electrode member 37 and the inner peripheral edge of the land member 35, the molten solder enters the gap and solidifies, so that the strength of the electrode portion 31 increases. .

  In the electrode portion 31 of the above embodiment, the electrode portion 31, that is, the electrode member 37 is disposed within the range of the thickness of the circuit board 21, and the terminal contact surface 37 a is set back so as to be recessed from the surface 21 a of the circuit board 21. ing. Therefore, the pressure sensor 11 is disposed closer to the circuit board 21, which is advantageous in reducing the size of the entire brake fluid pressure control device, especially in reducing the size along the direction orthogonal to the circuit board 21.

  In addition, since the terminal contact surface 37a is located in the opening 36 formed by the land member 35 so as to retreat, a step 39 is formed between the end surface 35a of the land member 35 and the terminal contact surface 37a, The inner peripheral cylindrical surface 35c of the land member 35 surrounds the terminal contact surface 37a. Therefore, in a state where the terminal 12 of the pressure sensor 11 is in contact with the terminal contact surface 37a, the pressure sensor 11 vibrates due to external vibration or the like, and the terminal 12 moves in a direction along the surface of the circuit board 21. In this case, the movement of the terminal 12 is restricted by the step 39 surrounding the terminal contact surface 37a. That is, the terminal 12 is less likely to come off from the terminal contact surface 37a due to vibration or the like, and the electrical connection is reliably maintained. Further, since the terminal 12 is unlikely to come off from the terminal contact surface 37a, the terminal contact surface 37a, that is, the electrode member 37 can be formed relatively small.

  In particular, when the electrode member 37 is formed by punching, the peripheral portion close to the cut surface is plastically deformed into a tapered surface, and the terminal is likely to be displaced outward in a configuration protruding as a pad as in the related art. On the other hand, in the above embodiment, since the terminal contact surface 37a is surrounded by the step 39, the terminal 12 is unlikely to come off even if the peripheral edge of the terminal contact surface 37a is inclined in a tapered shape.

  Next, FIG. 12 is an enlarged cross-sectional view of a main part showing a second embodiment of the electrode unit 31. The up and down directions in FIG. 12 correspond to the up and down directions in FIGS. 3 and 4, and the lower side in FIG. 12 is the hydraulic block 1 side and the upper side is the cover 4 side. Similarly to the first embodiment, the three electrode portions 31 are arranged so as to be located at the vertices of an equilateral triangle, respectively, corresponding to the arrangement of the three terminals 12 of the pressure sensor 11. Are in contact with the corresponding electrode portions 31, respectively. FIG. 12 shows one of the three electrode units 31.

  In the second embodiment, an electrode member 41 made of another member is fitted in the opening 36 formed by the land member 35, and the electrode portion 31 is formed by the electrode member 41. As in the first embodiment, the electrode member 41 is made of a disk-shaped copper, and the entire outer surface thereof is gold-plated in advance. The electrode member 41 is formed to have a diameter slightly larger than the inner diameter of the opening 36, and is firmly fixed in the opening 36 by being pressed into the opening 36. The electrode member 41 is formed, for example, by punching a copper plate into a circle.

  The thickness of the electrode member 41 in the assembled state is smaller than the thickness of the circuit board 21, and the end surface 41 b on the side opposite to the pressure sensor 11 in the opening 36 is flat with the end surface 35 b of the land member 35. It is fixed in a state that makes it easy. Therefore, the other end surface of the electrode member 41 with which the terminal 12 of the pressure sensor 11 contacts, that is, the terminal contact surface 41 a is receded from the surface 21 a of the circuit board 21 on the pressure sensor 11 side. In other words, the terminal contact surface 41a is located at a predetermined depth in the opening 36 formed by the land member 35.

  In the second embodiment, since the electrode member 41 is firmly fixed and the electrical conduction with the land member 35 is improved as compared with the caulking prevention of the first embodiment, the solder layer 38 is provided. Not.

  In the second embodiment, as in the first embodiment, the electrode portion 31, that is, the electrode member 41 is arranged within the range of the thickness of the circuit board 21, and the terminal contact surface 41 a is formed on the surface 21 a of the circuit board 21. It is receding so as to dent from it. Accordingly, the pressure sensor 11 is disposed closer to the circuit board 21, which is advantageous in reducing the size of the entire brake fluid pressure control device, particularly in reducing the size along the direction orthogonal to the circuit board 21.

  In addition, since the terminal contact surface 41a is located in the opening 36 formed by the land member 35 so as to retreat, a step 39 is formed between the end surface 35a of the land member 35 and the terminal contact surface 41a, The inner peripheral cylindrical surface 35c of the land member 35 surrounds the terminal contact surface 41a. Therefore, in a state where the terminal 12 of the pressure sensor 11 is in contact with the terminal contact surface 41a, the pressure sensor 11 vibrates due to externally applied vibration or the like, and the terminal 12 will move in a direction along the surface of the circuit board 21. In this case, the movement of the terminal 12 is restricted by the step 39 surrounding the terminal contact surface 41a. That is, the terminal 12 is less likely to come off from the terminal contact surface 41a due to vibration or the like, and the electrical connection is reliably maintained. Further, since the terminal 12 is unlikely to come off from the terminal contact surface 41a, the terminal contact surface 41a, that is, the electrode member 41 can be formed relatively small. Even if the peripheral edge of the terminal contact surface 41a is inclined in a tapered shape due to the punching of the electrode member 41, the terminal 12 is unlikely to come off.

  Next, FIG. 13 is an enlarged cross-sectional view of a main part showing a third embodiment of the electrode unit 31. The up and down directions in FIG. 13 correspond to the up and down directions in FIGS. 3 and 4, and the lower side in FIG. 13 is the hydraulic block 1 side and the upper side is the cover 4 side. Similarly to the first embodiment, the three electrode portions 31 are arranged so as to be located at the vertices of an equilateral triangle, respectively, corresponding to the arrangement of the three terminals 12 of the pressure sensor 11. Are in contact with the corresponding electrode portions 31, respectively. FIG. 13 shows one of the three electrode units 31.

  In the third embodiment, an electrode member 51 made of a separate member is fitted into the opening 36 formed by the land member 35, and the electrode portion 31 is formed by the electrode member 51. The electrode member 51 is made of a disk-shaped copper, and is formed, for example, by punching a copper plate in a circular shape. The electrode member 51 is formed to have a slightly larger diameter than the inner diameter of the opening 36, and is firmly fixed in the opening 36 by being pressed into the opening 36. After the press-fitting, the terminal contact surface 51a is plated with gold. That is, in the third embodiment, the electrode portion 31 is configured as a so-called copper inlay.

  The thickness of the electrode member 51 in the assembled state is smaller than the thickness of the circuit board 21, and the end surface 51 b on the side opposite to the pressure sensor 11 in the opening 36 is flat with the end surface 35 b of the land member 35. It is fixed in a state that makes it easy. Therefore, the other end surface of the electrode member 51 with which the terminal 12 of the pressure sensor 11 contacts, that is, the terminal contact surface 51a is receded from the surface 21a of the circuit board 21 on the pressure sensor 11 side. In other words, the terminal contact surface 51a is located at a predetermined depth in the opening 36 formed by the land member 35.

  In the third embodiment, as in the second embodiment, since the electrode member 51 is firmly fixed by press-fitting and the electrical conduction with the land member 35 is improved, the solder layer 38 is not provided. .

  In the third embodiment, the same operation and effect as those of the first and second embodiments can be obtained. Furthermore, in the third embodiment, since the copper electrode member 51 having no gold plating on the outer peripheral surface as a so-called copper inlay is pressed into the opening 36 of the land member 35, the heat radiation of the electrode portion 31 is improved. .

  In the first to third embodiments, the opening 36 is formed by the land member 35, and the electrode members 37, 41, and 51 are fitted into the opening 36. If the strength is sufficient, the electrode members 37, 41, and 51 may be directly fitted into the openings formed in the circuit board 21 without using the land members 35. Further, the opening 36 may not be a through hole as in each of the above-described embodiments, and the opening 36 may be formed as a recess having a required depth.

  In the configuration of the embodiment having the land member 35, not only the land member 35 restricts the outward movement of the terminal 12, but also the land member 35 made of copper functions as an auxiliary electrode portion, so that the electrical connection is made. It is more advantageous in securing

  Next, FIG. 14 is an enlarged cross-sectional view of a main part showing a fourth embodiment of the electrode unit 31. The vertical direction in FIG. 14 corresponds to the vertical direction in FIGS. 3 and 4 as in FIG. 10, and the lower side of FIG. 14 is the hydraulic block 1 side and the upper side is the cover 4 side. FIG. 15 is an external perspective view of the three electrode portions 31. FIG. 15 shows the circuit board 21 of FIG. 10 upside down, as in FIG. As shown in FIG. 15, the three electrode portions 31 are arranged so as to be located at the vertices of an equilateral triangle, respectively, corresponding to the arrangement of the three terminals 12 of the pressure sensor 11 described above. Each of the three terminals 12 of the pressure sensor 11 comes into contact with the corresponding electrode portion 31. FIG. 14 shows one of the three electrode portions 31 arranged as shown in FIG.

  As in the above-described embodiments, the circuit board 21 is a multilayer board including a plurality of insulating material layers 32 and a plurality of metal foil layers, for example, a copper foil layer 33, and includes, for example, six copper foil layers 33. I have. These copper foil layers 33 are formed in a desired wiring pattern by an appropriate etching method or the like. Here, in the fourth embodiment, the insulating material layer 32A on the surface 21a side covering the internal copper foil layer 33A is circular so that the internal copper foil layer 33A near the surface 21a on the pressure sensor 11 side is exposed. Opening 61 is formed. Due to the formation of the opening 61, the internal copper foil layer 33A is exposed in a circular shape, thereby forming the electrode portion 31. The surface of the exposed internal copper foil layer 33A to be the electrode portion 31, that is, the terminal contact surface 62 is plated with gold.

  The opening 61 can be formed, for example, by removing the insulating material layer 32A by machining after laminating the circuit board 21. After the opening 61 is formed, the terminal contact surface 62 is subjected to gold plating.

  Therefore, the terminal contact surface 62 is located within the range of the thickness of the circuit board 21 and is set back from the surface 21 a of the circuit board 21. In other words, the terminal contact surface 62 is located at a predetermined depth of the opening 61. A step 63 corresponding to the thickness of the insulating material layer 32A is formed between the terminal contact surface 62 and the surface 21a of the circuit board 21, and the inner peripheral cylindrical surface 61a of the opening 61 surrounds the terminal contact surface 62. ing.

  Also in the fourth embodiment, similarly to the first to third embodiments, the electrode portion 31, that is, the terminal contact surface 62 is located within the range of the board thickness of the circuit board 21, and is recessed from the surface 21a of the circuit board 21. Has receded. Accordingly, the pressure sensor 11 is disposed closer to the circuit board 21, which is advantageous in reducing the size of the entire brake fluid pressure control device, particularly in reducing the size along the direction orthogonal to the circuit board 21.

  In addition, since a step 63 exists between the surface 21 a of the circuit board 21 and the terminal contact surface 62, and the inner peripheral cylindrical surface 61 a of the opening 61 surrounds the terminal contact surface 62, the terminal 12 of the pressure sensor 11 Is moved in the direction along the surface of the circuit board 21, the movement of the terminal 12 is restricted. That is, the terminal 12 is less likely to come off from the terminal contact surface 62 due to vibration or the like, and the electrical connection is reliably maintained. Further, since the terminal 12 is unlikely to come off from the terminal contact surface 62, the opening 61 or the electrode portion 31 can be formed relatively small.

  Applying gold plating to the terminal contact surface 62 made of the internal copper foil layer 33A as the electrode portion 31 reduces contact resistance and suppresses wear and oxidation of the terminal contact surface 62. It is also possible to provide a conductive coating other than gold plating.

  In the illustrated example, the electrode portion 31 is configured using the internal copper foil layer 33A closest to the surface 21a of the circuit board 21. However, the other internal copper foil layers 33 indicated by reference numerals 33B to 33D are formed with openings. It is also possible to constitute the electrode part 31 by exposing it by 61. Thus, a greater depth from the surface 21a of the circuit board 21 to the terminal contact surface 62 can be obtained.

  As mentioned above, although one Example of this invention was described in detail based on drawing, this invention is not limited to the said Example, Various changes are possible. For example, in the above-described embodiment, the electrode unit 31 for making an electrical connection with the pressure sensor 11 is targeted, but the present invention can be similarly applied to an electrode unit for an electric component other than the pressure sensor 11. The present invention is also applicable to electronic devices other than the brake fluid pressure control device.

  The electrode unit 31 of each of the above embodiments has a configuration in which the terminals 12 of the pressure sensor 11 individually contact the terminal contact surfaces of the individual electrode units 31. For example, a plurality of terminals are connected to one electrode unit. The present invention can be applied to a relatively large electrode portion that contacts the terminal contact surface of the present invention.

  As described above, the electronic device of the present invention includes an electrode portion on a circuit board, and a terminal of an electric component is brought into contact with the electrode portion to make an electrical connection. The electrode portion is provided within the range, and a terminal contact surface of the electrode portion with which the terminal contacts is located retreating from the surface of the circuit board.

  In another aspect, in an electronic device in which an electrode portion is provided on a circuit board, and a terminal of an electric component is brought into contact with the electrode portion to make an electrical connection, the circuit board is provided with an opening including a recess or a through hole. The electrode portion is disposed in the opening, and a terminal contact surface of the electrode portion with which the terminal contacts is located at a predetermined depth of the opening.

  In a preferred aspect, an annular land member forming the opening is provided on the circuit board, and a disk-shaped electrode member forming the electrode portion is fitted on the inner periphery of the land member. .

  In one aspect, the electrode member and the land member are soldered to each other on a circuit board surface opposite to the terminal contact surface.

  In another preferred embodiment, the circuit board is a multilayer board having at least one internal metal foil layer, the insulating material layer covering the internal metal foil layer has an opening, and the electrode section is The inner metal foil layer is exposed through the opening.

  DESCRIPTION OF SYMBOLS 1 ... Hydraulic block, 2 ... Controller, 3 ... Body, 4 ... Cover, 5 ... Electric motor, 8 ... Solenoid valve, 11 ... Pressure sensor, 12 ... Terminal, 21 ... Circuit board, 23 ... Sensor support hole, 31 ... Electrode portion, 32: insulating material layer, 33: copper foil layer, 35: land member, 36: opening, 37: electrode member, 37a: terminal contact surface, 38: solder layer, 39: step portion, 41: electrode member 41a: terminal contact surface, 51: electrode member, 51a: terminal contact surface, 61: opening, 62: terminal contact surface, 63: step portion.

Claims (5)

An electronic device comprising an electrode portion on a circuit board and a terminal of an electrical component contacting the electrode portion to make an electrical connection.
The electrode portion is provided within a range of the thickness of the circuit board, and a terminal contact surface of the electrode portion with which the terminal contacts is located receding from a surface of the circuit board. Electronic device. An electronic device comprising an electrode portion on a circuit board and a terminal of an electrical component contacting the electrode portion to make an electrical connection.
The circuit board is provided with an opening formed of a concave portion or a through hole, and the electrode portion is arranged in the opening,
An electronic device, wherein a terminal contact surface of the electrode portion with which the terminal contacts is located at a predetermined depth of the opening. An annular land member constituting the opening is provided on the circuit board,
3. The electronic device according to claim 2, wherein a disk-shaped electrode member constituting the electrode unit is fitted on an inner periphery of the land member. 4.   4. The electronic device according to claim 3, wherein the electrode member and the land member are soldered to each other on a circuit board surface opposite to the terminal contact surface. The circuit board comprises a multilayer board having at least one internal metal foil layer,
An insulating material layer covering the internal metal foil layer has an opening,
The electronic device according to claim 1, wherein the electrode portion is configured by exposing the internal metal foil layer through the opening.

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