electronic components

Abstract

An electronic component includes a housing, an electronic circuit board, and a conductor portion. The housing is formed by fitting a first case and a second case. The electronic circuit board is accommodated in the housing. The conductor portion is formed to continuously extend along a circumferential direction of the electronic circuit board at a portion of the first case where the first case and the second case are fitted. The conductor portion is electrically connected to a ground plane of the electronic circuit board.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to a structure of an electronic component. BACKGROUND

[0002] For example, Japanese Patent Application Publication No. 2007-5265 discloses a servo motor apparatus, as an example of an electronic component, which has a control circuit board and is formed by fitting a first housing and a second housing.

[0003] In such an electronic component formed by fitting a plurality of housings, when static electricity is applied from the outside to the electronic component, the static electricity can enter the electronic component through a minute gap between the housings. In this case, a high voltage is applied to elements on the electronic circuit board, so that the corresponding elements can be damaged.

[0004] Therefore, there is a need for a structure for discharging static electricity that enters through the gap between the housings to the ground. SUMMARY

[0005] The present disclosure provides a structure of an electronic component that prevents static electricity from entering an electronic circuit board built in the electronic component.

[0006] According to one aspect of the present disclosure, there is provided an electronic component including: a housing formed by fitting a first housing and a second housing; an electronic circuit board accommodated in the housing; and a conductor portion formed to continuously extend along a circumferential direction of the electronic circuit board at a portion of the first housing where the first housing and the second housing are fitted. Further, the conductor portion is electrically connected to a ground plane of the electronic circuit board.

[0007] Static electricity can enter through a portion of the first housing and the second housing that are in contact with each other. Therefore, the conductor portion formed to continuously extend along the circumferential direction is formed at a fitting portion between the first housing and the second housing.

[0008] In the above-described electronic component, each of the first housing and the second housing can be made of an electrically conductive material, an insulating film is formed on a surface of the electrically conductive material, the electrically conductive material can be electrically connected to the ground plane, and the electrically conductive material of the conductor portion of the first housing can be exposed.

[0009] Since each of the first housing and the second housing is made of the electrically conductive material, a shielding effect against electromagnetic waves is obtained. Further, by forming the insulating film on each of the first housing and the second housing, a short circuit in the housing can be prevented. Also, by forming the insulating film, corrosion of the housing made of the electrically conductive material is prevented.

[0010] In this case, since the insulating film is not formed on the conductor portion of the first housing, static electricity entering from the fitting portion between the first housing and the second housing flows into the ground plane through the conductor portion.

[0011] In the electronic component described above, the ground line can be formed in a substantially circumferentially wound shape on the electronic circuit board.

[0012] For example, the ground line can be formed to continuously or partially extend in the circumferential direction on the peripheral edge portion of the electronic circuit board. However, the ground line is mainly formed in a substantially circumferentially wound shape.

[0013] In the electronic component described above, the electronic component can be a servo motor device.

[0014] For example, the structure of the electronic device of the present disclosure is suitable for a servo motor used for an unmanned aerial vehicle (UAV).

[0015] According to aspects of the present disclosure, it is possible to prevent static electricity from entering an electronic circuit board. BRIEF DESCRIPTION OF DRAWINGS

[0016] The objects and features of the present disclosure will become apparent from the following description of embodiments, given in conjunction with the accompanying drawings, wherein:

[0017] Figure 1 An appearance of a servo motor device according to one embodiment of the present disclosure is shown;

[0018] Figure 2 is an exploded perspective view of a servo motor device according to the above-described embodiment;

[0019] Figure 3 is a sectional view of a servo motor device according to the above-described embodiment as viewed in the X-X direction shown; Figure 1

[0020] Figure 4 is a partially enlarged sectional view of a servo motor device according to the above-described embodiment as viewed in the X-X direction shown; Figure 1

[0021] Figures 5A to 5C An example of the arrangement of a ground line on an electronic circuit board according to the above-described embodiment is shown. DETAILED DESCRIPTION

[0022] Embodiments of the present invention will be described below.

[0023] In the present embodiment, a servo motor device 1 will serve as an example of an electronic component according to an embodiment of the present disclosure, and reference will be made to Figure 1 ​​The configuration example of the servo motor apparatus 1 of the present embodiment will be described with reference to FIG. 5.

[0024] The electronic component according to the embodiment of the present disclosure is not limited to the servo motor apparatus 1, and can be any apparatus as long as static electricity can enter an electronic circuit board through a gap between members forming the electronic component.

[0025] Further, the servo motor apparatus 1 is not limited to a servo motor for a UNV, and can be any servo apparatus that drives an object to be controlled based on an input control signal. The servo motor apparatus 1 is a servo apparatus suitable for remote control of an industrial radio control model, a radio control model, a robot, and the like based on a control signal transmitted through radio waves, a computer, or a programmable logic controller (PLC).

[0026] The configuration shown in the drawings referred to in the description of the present embodiment is a configuration of main components extracted as required for implementing the present embodiment and a vicinity configuration of the main components. Further, the drawings are schematic, and the relationship between the thickness and planar dimensions of each element shown in the drawings and the scale thereof are merely examples. Therefore, various changes can be made according to design and the like without departing from the technical idea of the present disclosure.

[0027] First, the configuration of the servo motor apparatus 1 of the present embodiment will be described with reference to Figure 1 The configuration example of the servo motor apparatus 1 of the present embodiment will be described with reference to FIG. 5.

[0028] Figure 1 The appearance of the servo motor apparatus 1 is shown. Figure 2 is an exploded perspective view of the servo motor apparatus 1. Figure 3 is a sectional view of the servo motor apparatus 1 as viewed in the X-X direction shown in Figure 1 Figure 4 is an enlarged view of the region pt shown in Figure 3 Figures 5A to 5C An example of the arrangement of the ground line 40 on the electronic circuit board 4 is shown.

[0029] The various members constituting the servo motor apparatus 1 in the present embodiment will be described. The servo motor apparatus 1 includes a housing 2, a mounting ring 3, an electronic circuit board 4, a motor unit 5, a connector 6, a driving mechanism 7, and a driving unit 8 (see Figures 1 to 3 ). The housing 2 is formed by fitting a first case 10 and a second case 20.

[0030] In the following description, in Figure 1 ​​In the illustrated servo motor apparatus 1, the front-rear direction is defined by setting the direction from the second housing 20 side toward the first housing 10 side as the front direction and the direction from the first housing 10 side toward the second housing 20 side as the rear direction.

[0031] The first housing 10 and the second housing 20 are made of an electrically conductive material such as aluminum. An insulating film 9 is formed at the surfaces of the first housing 10 and the second housing 20 (the surface of the conductor portion 17 of the first housing 10 excepted) by a corrosion-resistant treatment such as an anodizing treatment, which will be described later.

[0032] The first housing 10 includes a first main body 11 and a first fitting protrusion 12 (see Figure 2 and Figure 3 ). A connector 6 for inputting a voltage for operating the servo motor apparatus 1 from a power source is connected to an attachment hole 13 formed on the front side of the first main body 11.

[0033] A first receiving hole 14 that opens rearward is formed at the first main body 11. The first receiving hole 14 has a first opening 16 formed on a rear surface 15 of the first main body 11. The first fitting protrusion 12 protrudes rearward from an opening edge of the first opening 16.

[0034] A rear end surface of the first fitting protrusion 12 is formed to function as a conductor portion 17 (see Figure 4 ). As described above, the conductor portion 17 is formed with the insulating film 9 peeled therefrom. The conductor portion 17 is formed to extend continuously in the circumferential direction. The conductor portion 17 can be formed on the entire rear end surface of the first fitting protrusion 12, or can be formed on a part of the rear end surface of the first fitting protrusion 12.

[0035] The second housing 20 includes a second main body 21 and a second fitting protrusion 22 (see Figure 3 and Figure 4 ).

[0036] A second receiving hole 23 that opens forward is formed at the second main body 21. The second receiving hole 23 has a second opening 25 formed on a front surface 24 of the second main body 21. The second fitting protrusion 22 protrudes forward from an outer peripheral end of the front surface 24 of the second main body 21.

[0037] The mounting ring 3 is formed in a ring shape such that an inner peripheral surface 31 of the mounting ring 3 is in contact with an outer peripheral surface 18 of the first fitting protrusion 12 (see Figure 2 and Figure 4 ).

[0038] The electronic circuit board 4 has various elements that constitute an electronic circuit mounted thereon. On the front surface of the electronic circuit board 4, a ground line 40 is formed as a conductor pattern. The ground line 40 is formed to extend in the circumferential direction (a substantially circumferentially wound shape) on an outer peripheral portion 42 of the front surface of the electronic circuit board 4 (seeFigure 3 to Fig. 5).

[0039] The ground line 40 has various shapes according to the arrangement design of the components on the electronic circuit board 4. The following is an example of the arrangement of the ground line 40 formed in a substantially circumferential winding shape on the outer peripheral portion 42 of the front surface of the electronic circuit board 4.

[0040] For example, the ground line 40 can be formed to continuously extend in the circumferential direction on the outer peripheral portion 42 (see Figure 5A ). As an alternative example, the ground line 40 can be formed to continuously extend in the circumferential direction on the outer peripheral portion 42, and its width can be partially reduced in some portions of the ground line 40 according to the arrangement design of the components on the electronic circuit board 4 (see Figure 5B ). As another alternative example, the ground line 40 can not be formed on a portion of the outer peripheral portion 42 while extending in the circumferential direction according to the arrangement design of the components on the electronic circuit board 4 (see Figure 5C ).

[0041] The first housing 10 and the second housing 20 made of a conductive material are electrically connected to the ground line 40. Therefore, the static electricity flowing into the conductor portion 17 of the first housing 10 from which the insulating film 9 is peeled off flows into the ground plane formed by the first housing 10, the second housing 20, and the ground line 40.

[0042] The motor unit 5 is connected to the rear side of the electronic circuit board 4. The electronic circuit board 4 controls the motor unit 5. The motor unit 5 is connected to the drive mechanism 7, and the drive unit 8 drives via the drive mechanism 7 by transmitting the output torque of the motor unit 5 to the drive mechanism 7.

[0043] Next, an example of the installation of various components constituting the servo motor apparatus 1 in the present embodiment will be described.

[0044] The drive mechanism 7 and the motor unit 5 connected to the electronic circuit board 4 are housed in the second receiving hole 23 of the second housing 20 (see Figure 2 and Figure 3 ).

[0045] The front surface 24 of the second main body 21 contacts the outer peripheral portion 43 of the rear surface of the electronic circuit board 4 (see Figure 4 ). The electronic circuit board 4 and the second main body 21 in contact with each other are fixed, for example, with a screw 50.

[0046] Further, the mounting ring 3 is connected to the first housing 10 by bringing the inner peripheral surface 31 of the mounting ring 3 into contact with the outer peripheral surface 18 of the first fitting protrusion 12 of the first housing 10.

[0047] In a state where the mounting ring 3 is connected to the first housing 10, the rear outer peripheral surface 19 of the first fitting protrusion 12 contacts the inner peripheral surface 26 of the second fitting protrusion 22. Thereby, the first housing 10 is fitted to the second housing 20.

[0048] Accordingly, electrostatic that has entered the gap between the rear outer peripheral surface 19 of the first fitting protrusion 12 and the inner peripheral surface 26 of the second fitting protrusion 22 flows into the conductor portion 17 before reaching the electronic circuit board 4. Thus, the electrostatic flows into the ground surface formed by the first housing 10, the second housing 20, and the ground line 40.

[0049] The front end surface 32 of the mounting ring 3 contacts the rear surface 15 of the first housing 10, and the rear end surface 33 of the mounting ring 3 contacts the front end surface 27 of the second fitting protrusion 22, so that the positions of the mounting ring 3, the first housing 10, and the second housing 20 are aligned.

[0050] At this time, the conductor portion 17 of the first housing 10 is disposed to face the electronic circuit board 4. Further, the conductor portion 17 can be in direct contact with the ground line 40 of the electronic circuit board 4. In a case where the conductor portion 17 is in direct contact with the ground line 40, the electronic circuit board 4 can be subjected to surface treatment such as planarization to prevent deterioration of the conductivity of the ground line 40 due to oxidation.

[0051] In a state where the positions of the mounting ring 3, the first housing 10, and the second housing 20 are aligned, the first housing 10 and the second housing 20 are fixed, for example, by a plurality of screws 60 (see Figure 1 and Figure 2 ).

[0052] As described above, in the servo motor apparatus 1 (electronic component) of the present embodiment, the first housing 10 and the second housing 20 are fitted to form the housing 2; the electronic circuit board 4 is housed in the housing 2; and the conductor portion 17 is formed to continuously extend in the circumferential direction at the portion of the first housing 10 where the second housing 20 is fitted. The conductor portion 17 is electrically connected to the ground surface of the electronic circuit board 4 (see Figure 1 to FIG. 5).

[0053] Electrostatic can enter through the portions of the first housing 10 and the second housing 20 that are in contact with each other. Therefore, the conductor portion 17 that is formed to continuously extend in the circumferential direction is formed at the fitting portion between the first housing 10 and the second housing 20.

[0054] Accordingly, electrostatic that enters from the fitting portion flows from the conductor portion 17 to the ground surface. Thus, electrostatic can be effectively prevented from flowing into the electronic circuit board 4.

[0055] In the servo motor apparatus 1 of the present embodiment, the first housing 10 and the second housing 20 are made of a conductive material on which the insulating film 9 is formed on a surface; the conductive material is electrically connected to a ground surface; and the conductive material of the conductor portion 17 of the first housing 10 is exposed (see Figure 1 to FIG. 5).

[0056] Since each of the first housing 10 and the second housing 20 is made of a conductive material, a shielding effect against electromagnetic waves is obtained. Further, by forming the insulating film 9 on each of the first housing 10 and the second housing 20, a short circuit in the housing 2 can be prevented. Further, by forming the insulating film 9, corrosion of the housing 2 made of a conductive material is prevented.

[0057] In this case, the conductive material of the conductor portion 17 of the first housing 10 is exposed so that static electricity entering from the fitting portion between the first housing 10 and the second housing 20 flows from the conductor portion 17 to the ground surface.

[0058] For example, when the housing 2 is an aluminum case, a shielding effect against electromagnetic waves is obtained. Further, by forming the insulating film 9 on the housing 2, an effect of preventing a short circuit in the housing 2 and an effect of preventing corrosion can be obtained, and this is particularly suitable for equipment for outdoor UAVs.

[0059] Further, as an example of a method of exposing the conductive material of the conductor portion 17 of the first housing 10, a method of forming the insulating film 9 on the first housing 10 except for the conductor portion 17 or a method of forming the insulating film 9 on the first housing 10 and then peeling off the insulating film 9 on the conductor portion 17 can be considered.

[0060] In particular, in the latter case, since the insulating film 9 is peeled off later, the conductor portion 17 can be formed by a simple process, and the production efficiency can be improved.

[0061] Further, since the conductor portion 17 is a part of the conductive material forming the housing 2 and is connected to the ground wire 40, a shielding effect and an effect of preventing static electricity from entering the electronic circuit board 4 can be appropriately obtained.

[0062] In the servo motor apparatus 1 of the present embodiment, the ground wire 40 is formed in a substantially circumferentially wound shape on the electronic circuit board 4 (see Figure 1 to FIG. 5).

[0063] For example, the ground wire 40 can be formed to continuously or partially extend in the circumferential direction on the peripheral edge portion of the electronic circuit board 4. However, the ground wire 40 is mainly formed in a substantially circumferentially wound shape.

[0064] Therefore, the effect of the conductor portion 17 of the housing 2 preventing static electricity from entering the electronic circuit board 4 can be further improved by preventing static electricity from flowing in through the ground wire 40.

[0065] In the present embodiment, the servo motor device 1 is adopted as an example of the electronic component of the present disclosure. As an example of the servo motor device 1, a servo motor for a UAV is adopted.

[0066] The technical idea of the present disclosure can be appropriately applied to a servo motor device 1 having an electronic circuit board 4 built in.

[0067] Further, in the present embodiment, an example in which the conductor portion 17 is formed at the first housing 10 of the housing 2 has been described. However, the conductor portion 17 can be formed at the second housing 20, or can be formed at both the first housing 10 and the second housing 20. For example, the front end surface of the second fitting protrusion 22 of the second housing 20 can be formed as the conductor portion 17.

[0068] The effects of the present disclosure are exemplary and not limiting. For example, other effects can be obtained, or part of the effects described in the present disclosure can be obtained.

[0069] Further, the embodiments described in the present disclosure are merely examples, and the present disclosure is not limited to the above-described embodiments. Therefore, various changes other than the above-described embodiments can be made according to design, etc., without departing from the technical idea of the present invention. Further, all combinations of the configurations described in the embodiments are not essential to solve the problem.

Claims

1. An electronic component comprising: a housing formed by fitting a first case and a second case; an electronic circuit board housed in the housing; a conductor portion formed to continuously extend along a circumferential direction of the electronic circuit board at a portion of the first case where the first case and the second case are fitted, wherein the conductor portion is electrically connected to a ground plane of the electronic circuit board, each of the first case and the second case is made of an electrically conductive material on a surface of which an insulating film is formed; the electrically conductive material of the first case and the electrically conductive material of the second case are electrically connected to the ground plane by a ground line; the conductor portion is formed with the insulating film peeled off from the conductor portion so that the electrically conductive material of the conductor portion of the first case or the second case is exposed, and electrostatic current flowing into the conductor portion from which the insulating film is peeled off is drained into the ground plane formed by the first case, the second case, and the ground line.

2. The electronic component according to claim 1, wherein The ground line is formed in a substantially circumferentially wound shape on the electronic circuit board.

3. The electronic component according to claim 1 or 2, wherein The electronic component is a servo motor device.

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