A micro vibration motor

Abstract

The present invention discloses a micro vibration motor, comprising: a motor body, an eccentric weight disposed at one end of the motor body and a terminal at the other end, a rubber sleeve covering the outer peripheral surface of the motor body, an FPC board fixedly electrically connected to the terminal, the FPC board including a fixed end bent and extending from the end cover side to the flat surface of the motor body and a free end extending out of the motor body, one surface of the fixed end of the FPC board being mounted on the flat surface, the rubber sleeve covering the fixed end of the FPC, at least one conductive region being provided on the other surface of the FPC, a metal tape being provided between the rubber sleeve and the FPC board, and the metal tape being electrically connected to the motor body and the conductive region. The metal tape includes an arc surface, a flat surface and an extension portion, and the metal tape wraps the motor body to form electromagnetic shielding, thus effectively reducing or eliminating the electromagnetic interference that the motor body and the FPC may cause to customer products.

Description

Technical Field:

[0001] The present invention relates to the field of micro vibration motors, and particularly to a micro vibration motor. Background Art:

[0002] Micro vibration motors are mainly applied to electronic products such as mobile phones, Smart-watches, Bluetooth devices, PADs, and notebooks, serving the function of silent vibration reminder.

[0003] An FPC type iron core vibration motor generally consists of a motor body, an FPC, and a rubber sleeve. The electrical connection is achieved by adding a ground wire through the FPC or opening a window on the flat surface of the rubber sleeve.

[0004] However, in the prior art, the conductive area where the FPC ground wire contacts the housing is small, resulting in poor conduction performance and a poor effect on reducing electromagnetic interference. For the rubber sleeve opening, the motor body makes full contact with the conductive foam tape added by the customer to achieve conduction, but the electromagnetic interference caused by the FPC cannot be avoided.

[0005] To solve the above problems, it is urgent to develop a new iron core vibration motor that can improve the problem of electromagnetic interference while ensuring the vibration quality, conduction performance, and customer size requirements of the vibration motor. Summary of the Invention:

[0006] The purpose of the present invention is to provide a micro vibration motor that can effectively improve the problem of electromagnetic interference of the motor.

[0007] To achieve the above purpose, the present invention adopts the following technical solutions:

[0008] A micro vibration motor includes: a motor body, an eccentric hammer provided at one end of the motor body and a terminal at the other end, a rubber sleeve covering the outer peripheral surface of the motor body, an FPC board fixedly electrically connected to the terminal. The FPC board includes a fixed end bent and extending from the end cover side to the flat surface of the motor body and a free end extending out of the motor body. One side of the fixed end of the FPC board is mounted on the flat surface, the rubber sleeve covers the fixed end of the FPC, at least one conductive area is provided on the other side of the FPC, and a metal tape is provided between the rubber sleeve and the FPC board, and the metal tape electrically connects the motor body and the conductive area.

[0009] Further, the metal tape is a flexible plate shape, covering the outer peripheral surface of the motor body, and openings are formed on the motor body at both ends of the metal tape.

[0010] Further, the shape of the metal tape corresponding to the motor body includes an arc surface and a flat surface, and an extension part is provided outward from the edge of the flat surface at the opening.

[0011] Further, the flat surface and the extension part of the metal tape cover the conductive area of the fixed end of the FPC board.

[0012] Further, the metal tape is a single-sided adhesive double-sided conductive tape. The metal is a self-adhesive tape, with one side of the metal covered with adhesive to stably connect it to the motor body, and double-sided conductivity to fully contact the FPC board to achieve electrical conduction.

[0013] Further, the metal tape includes: copper foil tape, aluminum foil tape, and gold foil tape.

[0014] Further, the conductive area is two conductive areas on the other side of the FPC, including a grid-shaped exposed copper conductive area and a solid exposed copper conductive area.

[0015] Further, a cut is provided on one side of the rubber sleeve that fits the fixed end of the FPC board, and the free end of the FPC extends out of the rubber sleeve from this cut.

[0016] Further, a window is provided on the side of the rubber sleeve away from the FPC board, and the metal tape is exposed at the window, facilitating full contact between the customer's product and it to achieve conduction.

[0017] A micro vibration motor includes the following installation steps:

[0018] Assemble the motor body and the end cover;

[0019] Connect and fix the fixed end of the FPC board to the terminal of the end cover and bend and extend the fixed end from one side of the end cover to the middle of the flat surface of the motor body. The fixed end of the FPC board is mounted on the outside of the flat surface of the motor body;

[0020] Attach and wrap the metal tape on the outside of the motor body and the fixed end of the FPC board;

[0021] Fit and sleeve the rubber sleeve on the outside of the motor body and the metal tape.

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] 1. One side of the FPC is attached to the flat surface of the housing, and the other side exposes the grid metal, which better contacts the metal tape covering the motor to form conduction.

[0024] 2. The glue on the rear half of the top of the customized rubber sleeve is removed to expose the metal tape, facilitating full contact between the customer's product and it to achieve conduction.

[0025] 3. The contact area is large, the conduction performance is good, reducing or eliminating the possible electromagnetic interference impact of the motor body and the FPC on the customer's product. Description of the drawings:

[0026] Figure 1This is a schematic assembly diagram of the motor body and the FPC board of the present invention.

[0027] Figure 2 This is a schematic assembly diagram of the metal tape, the motor body and the FPC board of the present invention.

[0028] Figure 3 This is an axial schematic diagram of the metal tape structure of the present invention.

[0029] Figure 4 This is an oblique side schematic diagram of the metal tape structure of the present invention.

[0030] Figure 5 This is a schematic assembly diagram of the rubber sleeve, the metal tape and the motor main body of the present invention.

[0031] Figure 6 This is a schematic structural diagram of the rubber sleeve of the present invention.

[0032] Reference numerals:

[0033] 10 - Metal tape, 101 - Arc surface, 102 - Flat surface, 103 - Extension part, 104 - Opening

[0034] 11 - Rubber sleeve, 110 - Rubber sleeve notch, 111 - Rubber sleeve window, 112 - First through hole, 113 - Second through hole

[0035] 114 - Limiting part, 115 - Concave platform, 12 - FPC board, 120 - Conductive area, 13 - Motor body, 14 - Eccentric hammer

[0036] 15 - End cover, 16 - Terminal. Detailed implementation manners:

[0037] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components of the embodiments of the present invention described and illustrated in the drawings here can be arranged and designed in various different configurations.

[0038] Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0039] See Figures 1 - 5, a micro vibration motor 1, comprising: a motor body 13, an eccentric hammer 14, an end cover 15, terminals 16, a rubber sleeve 11, an FPC board 12, and a metal tape 10. The eccentric hammer is disposed at one end of the motor body 13, the end cover 15 is disposed at the other end of the motor body 13, and positive and negative power connection terminals 16 are symmetrically arranged on the end cover 15. The rubber sleeve 11 covers the outer peripheral surface of the motor body 13, the FPC board 12 is fixedly electrically connected to the terminals 16, the FPC board 12 includes a fixed end bent and extending from the side of the end cover 15 to the flat surface of the motor body 13 and a free end extending out of the motor body 13, one side of the fixed end of the FPC board 12 is mounted on the flat surface, and the rubber sleeve 11 covers the fixed end of the FPC board 12. At least one conductive area 120 is provided on the other side of the FPC board 12, a metal tape 10 is provided between the rubber sleeve 11 and the FPC board 12, and the metal tape 10 electrically connects the motor body 13 and the conductive area 120.

[0040] The metal tape 10 is a flexible plate shape, covering the outer peripheral surface of the motor body 13. After covering, metal tape openings 104 are formed at the joints of both ends of the metal tape 10. The metal tape 10 includes flat surfaces 102 and arc surfaces 101, and extension parts 103 are arranged outward from the edges of the flat surfaces 102 at the openings 104. There are two flat surfaces 102, and they are arranged oppositely. There are two arc surfaces 101, and they are arranged oppositely. The width of the metal tape opening 104 is greater than the thickness of the FPC board 12, so that the free end of the FPC board can pass through the opening 104 and extend out of the motor body.

[0041] The extension parts 103 extend outward from the flat surfaces 102 at the metal tape openings 104, and the widths of the extension parts 103 are the same as the widths of the corresponding positions of the FPC board 12. The extension parts 103 not only increase the contact conductive area, but also can become the reinforcement plates of the conductive area, so as to avoid the situation that the FPC board fails due to bending and breaking during the installation with the client or in the normal working state.

[0042] The metal tape 10 is a self-adhesive tape, with glue on the side contacting the motor body 13, and both sides are conductive. The metal tape 10 wraps the motor body 13. The metal material can effectively reflect or absorb electromagnetic waves, equivalent to a layer of barrier to shield the electromagnetic waves inside the motor body 13, and can reduce or eliminate the electromagnetic interference (Electromagnetic Interference, abbreviated as EMI) that the motor body 13 and the FPC board 12 may cause to the client product. The metal tape is used to wrap the motor body to effectively reduce or even eliminate the electromagnetic interference of the motor body and the FPC board on the client product. Commonly used metal tapes include copper foil tapes, aluminum foil tapes, tin foil tapes, gold foil tapes, etc., all of which can play a role in preventing electromagnetic interference.

[0043] In the actual production process, first assemble the motor body 13, then assemble the motor body 13 with the eccentric weight 14, and then assemble the whole of the fixed end of the FPC board 12 electrically connected to the terminal 16 with the metal tape 10. The flat surface of the motor body 13 is in a state of being in contact with the metal tape 10. The metal tape 10 wraps and covers the motor body 13 and the FPC board 12 at the fixed end of the motor body 13. Finally, the rubber sleeve 11 wraps and covers the motor body 13 and the metal tape 10.

[0044] The rubber sleeve 11 wraps and covers the metal tape 10 and the motor body 13, so that during the normal operation or frequent dropping process of the vibration motor 1, it plays a damping role for the vibration motor, and at the same time makes the fixation of the vibration motor more stable at the client side. During the vibration process, it prevents the metal tape 10 from moving or falling off relative to the motor body 13, and at the same time plays a protective role for the motor body 13 and the metal tape, avoiding damage and other situations.

[0045] The rubber sleeve 11 includes a limiting portion 114 provided at one end close to the eccentric weight 14. A circular first through hole 112 is provided in the middle of the limiting portion 114 for passing through the eccentric weight at one end of the motor body. The other end of the rubber sleeve 11 adjacent to the end cover is set as a second through hole 113, and the second through hole is larger than the first through hole to facilitate the insertion of the motor body into the rubber sleeve 11. A cut 110 is provided on one side of the rubber sleeve 11 that fits the extension portion 103. The width of the cut 110 of the rubber sleeve is larger than the width of the FPC board 12, and the width of the cut 110 of the rubber sleeve is larger than the total thickness of the FCP board 12 and the metal tape 10. So that the free ends of the extension portion 103 and the FPC board 12 extend out of the rubber sleeve 11 from the cut 110 of the rubber sleeve. A concave platform 115 is provided on the inner surface of one side of the rubber sleeve 11 in contact with the FPC board. The depth of the concave platform is approximately the thickness of the FPC board and the metal tape, reserving a accommodation space for the FPC board 12 and the metal tape 10, so as to ensure that the rubber sleeve 11 fully wraps and covers the motor body 13 and the metal tape 10 after assembly, without gaps, and avoid noise interference during the normal operation of the motor.

[0046] On one side of the rubber sleeve 11 away from the FPC board 12, there is a window 111. The width of the window 111 is greater than the transverse width of the metal tape 10. The metal tape 10 is exposed at the window 111, facilitating full contact between the customer's product and the metal tape 10 to achieve conduction, thereby realizing the electromagnetic shielding of the metal tape 10 and reducing or eliminating the possible electromagnetic interference effects on the customer's product caused by the motor body 13 and the FPC board 12. The incision 110 of the rubber sleeve 11 is generally T-shaped. The transverse incision is for the extension 103 of the metal tape 10 and the free end of the FPC board 12 to pass through. The window 111, the incision 110, and the second through hole 113 are connected, so that a movable wall is formed on the side of the rubber sleeve close to the end cover. When the motor body is inserted into the rubber sleeve, the movable wall can bend and deform outward, enabling the extension 103 and the FPC board 12 to smoothly enter the transverse incision.

[0047] The FPC board 12 is integrally J-shaped. Compared with the traditional straight FPC board, the conductive area 120 can be increased. The conductive area 120 is set as two copper-exposed areas of the FPC board 12. The copper-exposed area includes a grid-shaped copper-exposed conductive area and a solid copper-exposed conductive area. The contact area of these two conductive areas 120 is larger, and the electrical conduction performance with the metal tape and the client is better, avoiding the defect of poor electrical conduction in the vibration motor.

[0048] One flat surface 102 of the metal tape 10 and the extension 103 extending from the flat surface 102 cover one conductive area 120 of the fixed end of the FPC board 12, realizing electrical conduction between the FPC board 12 and the metal tape 10. The length of the conductive area 120 is greater than the length of the extension 103. The other conductive area 120 away from the free end of the FPC board is in contact conduction with the client, realizing the function of electromagnetic shielding.

[0049] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A micro vibration motor, comprising: a motor body, an eccentric weight disposed at one end of the motor body and a terminal at the other end, a rubber sleeve covering the outer peripheral surface of the motor body, an FPC board fixedly electrically connected to the terminal, the FPC board including a fixed end bent and extending from the end cover side to the flat surface of the motor body and a free end extending out of the motor body, one surface of the fixed end of the FPC board being mounted on the flat surface, the rubber sleeve covering the fixed end of the FPC, characterized in that a metal tape is provided between the rubber sleeve and the fixed end of the FPC board, the metal tape being a single-sided coated double-sided conductive tape, at least one conductive area being provided on the other surface of the FPC board, the metal tape being a flexible plate shape, covering the outer peripheral surface of the motor body, the metal tape being electrically connected to the motor body and the conductive area; the two ends of the metal tape form an opening on the motor body, the width of the opening being greater than the thickness of the FPC board; the shape of the metal tape corresponding to the motor body includes an arc surface and a flat surface, the metal tape being provided with an extension portion extending outward from the edge of the flat surface at the opening; the flat surface and the extension portion of the metal tape cover the conductive area of the fixed end of the FPC board; a notch is provided on the side of the rubber sleeve fitting the fixed end of the FPC board, a rubber sleeve window is provided on the side of the rubber sleeve away from the FPC board, and a concave platform is provided on the surface of the rubber sleeve in contact with the FPC board; the metal tape is exposed at the rubber sleeve window; the free end of the FPC board and the extension portion of the metal tape extend out of the rubber sleeve from the notch.

2. A micro vibration motor according to claim 1, characterized in that, the metal tape includes copper foil tape, aluminum foil tape, tin foil tape or gold foil tape.

3. A micro vibration motor according to claim 1, characterized in that, the conductive area is provided as two conductive regions on the other surface of the FPC, including a grid-shaped copper exposed conductive area, a stripe-shaped copper exposed area, and a solid copper exposed conductive area.

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