A bidirectional closed-loop motor

Abstract

The present invention relates to a voice coil motor, specifically a bidirectional conductive closed-loop motor, comprising a housing, a carrier, a base, a gasket, an upper spring sheet, a coil, a magnet, a lower spring sheet, and a circuit board. The technical key points are: the gasket has a built-in conductive material strip, the conductive material strip is provided with a top surface PIN foot that leads out of the gasket and extends to the top surface of the motor, and a side PIN foot that leads out of the gasket and extends to the side of the housing, the top surface of the housing is provided with an avoidance notch corresponding to the top surface PIN foot, the circuit board stands on one side of the base, the housing is provided with a positioning notch corresponding to the position of the circuit board, the upper end of the circuit board is welded to the side PIN foot, the lower end of the circuit board is welded to the metal sheet on the base, the metal sheet is welded to the lower spring sheet, and the lower spring sheet is welded to the connection point of the coil. The present invention solves the problem that the existing voice coil motor can only be conductive on one side, simplifies the processing technology, reduces the production cost, and has good versatility.

Description

Technical Field

[0001] The present invention relates to the technical field of voice coil motors, and in particular to a bidirectionally conductive closed-loop motor suitable for a lens driving device in a mobile terminal device in which a camera can automatically focus along an optical axis. Background Art

[0002] Since the voice coil motor (VCM) has the advantages of simple structure, small size, low energy consumption, no noise, high acceleration, fast response speed, precise displacement and low price, the automatic focusing function of the voice coil motor is still the most cost-effective solution for the automatic focusing device of the camera. By fixing the optical lens on the carrier of the voice coil motor, the carrier serves as the power unit for the movement of the lens, and connecting the carrier and the shell of the voice coil motor through an elastic structure, when the motor is powered on, the carrier will move linearly along the optical axis of the lens, thereby realizing the automatic focusing function.

[0003] The voice coil motor is mainly composed of a housing, a gasket, an upper spring, a carrier, a coil, a magnet, a lower spring, a base, a circuit board, etc. The existing voice coil motor can only achieve conduction between the base side and the circuit board, that is, the conduction between the circuit board and the coil on the carrier is achieved through the metal sheet set on the base and the lower spring connecting the base and the carrier, while the modules or components on the motor top side cannot achieve circuit conduction and signal transmission, and can only be configured with a separate circuit board, which results in a large space occupation and is not conducive to the miniaturization design of electronic products. Summary of the invention

[0004] The purpose of the present invention is to provide a bidirectionally conductive closed-loop motor with a compact structure and reliable use, so as to solve the problem that the existing voice coil motor can only be conductive on one side, simplify the processing technology, reduce the production cost, and have good versatility.

[0005] The technical solution of the present invention is:

[0006] A bidirectional conductive closed-loop motor comprises a shell, a carrier, a base, a gasket arranged on the top surface of the shell, an upper spring plate connected between the carrier and the shell, a coil arranged on the carrier, a magnet arranged corresponding to the coil, a lower spring plate connected between the base and the carrier, and a circuit board located between the base and the shell. The technical key points are: the gasket has a built-in conductive material strip, the conductive material strip is provided with a top surface PIN foot that leads out of the gasket and extends to the top surface of the motor, and a side PIN foot that leads out of the gasket and extends to the side of the shell, the top surface of the shell is provided with an avoidance notch corresponding to the top surface PIN foot, the circuit board stands on one side of the base, the shell is provided with a positioning notch corresponding to the position of the circuit board, the upper end of the circuit board is welded to the side PIN foot, the lower end of the circuit board is welded to the metal sheet on the base, the metal sheet is welded to the lower spring plate, and the lower spring plate is welded to the connection point of the coil.

[0007] In the above-mentioned bidirectional conductive closed-loop motor, the inner ring of the gasket is further fixed with a magnetically conductive bending portion extending along the optical axis, and the side surface of the carrier facing the gasket is provided with a groove corresponding to the magnetically conductive bending portion to prevent the magnetically conductive bending portion from affecting the movement of the carrier along the optical axis. The magnetically conductive bending portion is made of magnetically conductive material, and its arrangement enhances the electromagnetic driving force along the optical axis.

[0008] The above-mentioned bidirectional conductive closed-loop motor has four magnets, which are arranged in groups of two. The two groups of magnets are located on two opposite sides of the inner wall of the shell, and a magnetic conductive sheet is sandwiched between each group of magnets and the shell to enhance the electromagnetic driving force along the optical axis.

[0009] In the above-mentioned bidirectional conductive closed-loop motor, the carrier is not provided with a side opening of the coil and a Hall magnet is arranged in the hole, the base is provided with a hollow structure on the side corresponding to the Hall magnet, and the circuit board is provided with a sensor corresponding to the Hall magnet through the hollow structure. By detecting the strength of the magnetic field generated by the Hall magnet, the sensor generates an electrical signal for transmission, so as to control the displacement of the carrier according to the size of the coil current.

[0010] The above-mentioned bidirectionally conductive closed-loop motor has two coils, which are wound laterally on the side of the carrier corresponding to the position of the magnet, so as to cooperate with the magnet to drive the carrier to move.

[0011] A gasket, the technical key points of which are: the gasket has a built-in conductive material strip, the conductive material strip is provided with a top surface PIN pin that leads out of the gasket and extends to the top surface of the motor, and a side PIN pin that leads out of the gasket and extends to the side of the motor housing.

[0012] The gasket mentioned above has a magnetically conductive bending portion fixed on its inner ring extending along the optical axis.

[0013] The beneficial effects of the present invention are:

[0014] 1. The traditional gasket structure is eliminated, and a conductive material strip is built into the gasket. The conductive material strip is provided with a top PIN pin and a side PIN pin. The side PIN pin is electrically connected to the circuit board, and the top PIN pin is connected to other modules or other functional components, so as to realize the purpose of supplying power or transmitting signals from the circuit board to other modules or other functional components on the top side of the motor; the circuit board is electrically connected to the coil through the metal sheet and the lower spring sheet on the base to supply power to the coil, realize circuit conduction on the base side, and realize a two-way conduction mode together with the above-mentioned circuit structure on the top side.

[0015] 2. The structural form of the gasket is conducive to the miniaturization design of electronic products, with simple processing technology, low production cost and good versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1is a schematic diagram of the structure of the motor of the present invention;

[0017] Figure 2 is an exploded schematic diagram of the motor of the present invention;

[0018] Figure 3 is a schematic diagram of the structure of the carrier of the present invention;

[0019] Figure 4 It is a schematic structural diagram of the gasket of the present invention;

[0020] Figure 5 is a top view of the gasket of the present invention;

[0021] Figure 6 It is a schematic diagram of the structure of the carrier and the gasket of the present invention;

[0022] Figure 7 It is a schematic diagram of the assembly of the carrier, the lower spring sheet, the metal sheet and the circuit board of the present invention;

[0023] Figure 8 It is a schematic diagram of the assembly of the carrier, the lower spring sheet and the coil of the present invention.

[0024] In the figure: 1. shell, 101. avoidance gap, 2. gasket, 201. top PIN pin, 202. side PIN pin, 203. magnetic bending part, 204. conductive material strip, 3. circuit board, 4. upper spring sheet, 5. magnet, 6. magnetic sheet, 7. carrier, 701. groove, 8. coil, 801. connection point, 9. lower spring sheet, 10. base, 11. sensor, 12. metal sheet, 13. Hall magnet. DETAILED DESCRIPTION

[0025] The present invention is described in detail below in conjunction with the accompanying drawings.

[0026] like Figure 1-Figure 8 As shown, the bidirectional conductive closed-loop motor includes a shell 1, a carrier 7, a base 10, a gasket 2 arranged on the top surface of the shell 1, an upper spring plate 4 connected between the carrier 7 and the shell 1, a coil 8 arranged on the carrier 7, a magnet 5 arranged corresponding to the coil 8, a lower spring plate 9 connected between the base 10 and the carrier 7, and a circuit board 3 located between the base 10 and the shell 1.

[0027] The gasket 2 has a built-in conductive material strip 204, and the conductive material strip 204 is provided with a top surface PIN pin 201 that is led out of the gasket and extends to the top surface of the motor, and a side PIN pin 202 that is led out of the gasket and extends to the side of the shell. The inner circle of the gasket 2 is also fixed with a magnetic bending portion 203 extending along the optical axis. The top surface of the shell 1 is provided with an avoidance notch 101 corresponding to the top surface PIN pin. The circuit board 3 stands on one side of the base 10, and the shell 1 is provided with a positioning notch corresponding to the position of the circuit board 3. The upper end of the circuit board 3 is welded to the side PIN pin 202, and the lower end of the circuit board 3 is welded to the metal sheet 12 on the base, and the metal sheet 12 is welded to the lower spring sheet 9, and the lower spring sheet 9 is welded to the connection point 801 of the coil. The carrier 7 is provided with a groove 701 corresponding to the magnetic bending portion on the side surface facing the gasket to prevent the magnetic bending portion from affecting the movement of the carrier along the optical axis. The magnetic bending portion 203 is made of magnetic conductive material, and its setting enhances the electromagnetic driving force along the optical axis.

[0028] In this embodiment, the number of the magnets 5 is four, two in a group, and the two groups of magnets 5 are respectively located on two opposite sides of the inner wall of the shell, and a magnetic conductive sheet 6 is sandwiched between each group of magnets 5 and the shell 1 to enhance the electromagnetic driving force along the optical axis. The number of the coils 8 is two, which are wound around the side of the carrier corresponding to the position of the magnets 5 to work together with the magnets to drive the carrier to move. The carrier 7 is not provided with a side opening for the coil and a Hall magnet 13 is provided in the hole. The base 10 is provided with a hollow structure on the side corresponding to the Hall magnet 13. The circuit board 3 is provided with a sensor 11 corresponding to the Hall magnet 13 through the hollow structure. By detecting the strength of the magnetic field generated by the Hall magnet, the sensor generates an electrical signal for transmission to control the displacement of the carrier according to the size of the coil current.

[0029] In this embodiment, the number of conductive strips 204 is 4, and the top surface PIN pins 201 of the four conductive strips 204 are arranged in pairs of two, symmetrically on the top surface side. The number of magnetic conductive bending portions 203 is four, and they are arranged in pairs of two, symmetrically on the top surface side, and the magnetic conductive bending portions 203 and the conductive strips 204 are an integrated structure, and the conductive strips 204 are also magnetically conductive.

[0030] The circuit board 3 supplies power to the coil 8 through the metal sheet 12 and the lower spring sheet 9, and realizes power supply and signal transmission to other modules or other functional components on the motor top side through the side PIN pin 202 and the top PIN pin 201 of the conductive material strip 204 in the gasket 2.

[0031] The above embodiments of the present invention are described in detail, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the invention should still fall within the scope of this patent.

Claims

1. A bidirectional conductive closed-loop motor, comprising a housing, a carrier, a base, a gasket disposed on the top surface of the housing, an upper spring plate connected between the carrier and the housing, a coil disposed on the carrier, a magnet arranged corresponding to the coil, a lower spring plate connected between the base and the carrier, and a circuit board located between the base and the housing, characterized in that: The gasket has a built-in conductive material strip, and the conductive material strip is provided with a top surface PIN pin that leads out of the gasket and extends to the top surface of the motor, and a side PIN pin that leads out of the gasket and extends to the side of the shell. The top surface of the shell is provided with an avoidance notch corresponding to the top surface PIN pin. The circuit board stands on one side of the base, and the shell is provided with a positioning notch corresponding to the position of the circuit board. The upper end of the circuit board is welded to the side PIN pin, the lower end of the circuit board is welded to the metal sheet on the base, the metal sheet is welded to the lower spring sheet, and the lower spring sheet is welded to the connection point of the coil; The inner ring of the gasket is further fixed with a magnetically conductive bending portion extending along the optical axis direction, and the side surface of the carrier facing the gasket is provided with a groove corresponding to the magnetically conductive bending portion to prevent the magnetically conductive bending portion from affecting the movement of the carrier along the optical axis. The magnetically conductive bending portion is made of magnetically conductive material, and its setting enhances the electromagnetic driving force along the optical axis direction; There are four magnets in number, which are arranged in groups of two. The two groups of magnets are located at two opposite sides of the inner wall of the shell, and a magnetic conductive sheet is sandwiched between each group of magnets and the shell to enhance the electromagnetic driving force along the optical axis.

2. The bidirectional closed-loop motor according to claim 1, characterized in that: The carrier is not provided with a side opening of the coil and a Hall magnet is arranged in the hole. The base is provided with a hollow structure on the side corresponding to the Hall magnet. The circuit board is provided with a sensor corresponding to the Hall magnet through the hollow structure. By detecting the strength of the magnetic field generated by the Hall magnet, the sensor generates an electrical signal for transmission, so as to control the displacement of the carrier according to the size of the coil current.

3. The bidirectional closed-loop motor according to claim 1, characterized in that: The number of the coils is two, which are laterally wound around the side of the carrier corresponding to the position of the magnet, so as to cooperate with the magnet to drive the carrier to move.

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