A closed-loop motor with a separate conductive spring structure and a circuit conductive method thereof

Abstract

The present invention relates to a closed-loop motor with a separate conductive spring sheet structure and a circuit conduction method thereof, which includes a housing, a carrier, a base, a coil, a magnet, an upper spring sheet, a lower spring sheet, and a circuit board. The technical key points are: the upper spring sheet is a separate structure, which is composed of a plurality of independent spring sheets, each of which is composed of an inner connection frame connected to the carrier, an outer connection frame connected to the top surface of the side retaining wall of the base, and a string portion connected between the inner and outer connection frames. A soldering pad is provided on the upper surface of the inner connection frame, and an avoidance notch is provided at the position corresponding to the soldering pad of the housing. A plurality of through-type material strips are injection molded in the base, and one end of each through-type material strip extends from the inside of the side retaining wall of the base to the top surface of the side retaining wall and is connected to the outer connection frame of the corresponding independent spring sheet, and the other end of the through-type material strip is connected to the circuit board. The present invention solves the problem that the existing voice coil motor can only be conducted on one side, has a simple processing technology, low production cost, good versatility, and is conducive to the miniaturization design of electronic products.

Description

Technical Field

[0001] The present invention relates to the field of voice coil motor technology, and in particular to a closed-loop motor with a separate conductive spring structure and a circuit conduction method thereof, which is suitable for a lens drive 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, 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 lower spring, but 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 closed-loop motor with a separate conductive spring structure and a circuit conduction method thereof, which is compact and reliable, and solves the problem that the existing voice coil motor can only be conducted on one side. The process is simple, the production cost is low, the versatility is good, and it is conducive to the miniaturization design of electronic products.

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

[0006] A closed-loop motor with a separated conductive spring sheet structure comprises a housing, a carrier, a base, a coil arranged on the carrier, a magnet arranged corresponding to the coil, an upper spring sheet connected to the top surface of the carrier, a lower spring sheet connected between the bottom surface of the carrier and the base, and a circuit board located between the base and the housing. The technical key points are: the upper spring sheet is a separated structure, which is composed of a plurality of independent spring sheets for conducting the circuit and signal on the top surface side of the motor, each independent spring sheet is composed of an inner connection frame connected to the carrier, an outer connection frame connected to the top surface of the retaining wall on the base side, and a string part connected between the inner and outer connection frames. A soldering pad is provided on the upper surface of the inner connection frame, and an avoidance notch is provided at the position of the soldering pad corresponding to the outer shell. A plurality of through-type material strips are injection-molded in the base, and the number of the through-type material strips is equal to and corresponds to the number of independent spring pieces. One end of each through-type material strip extends from the side retaining wall of the base to the top surface of the side retaining wall and is connected to the external connection frame of the corresponding independent spring piece, and the other end of the through-type material strip is connected to the circuit board. A welding portion connected to the wiring point of the coil is provided on the lower spring piece, and a metal sheet is injection-molded in the base, and one end of the metal sheet is connected to the lower spring piece, and the other end is connected to the circuit board.

[0007] The above-mentioned closed-loop motor with a separated conductive spring structure has two coils, which are symmetrically wound around two opposite sides of the carrier. The magnets are divided into two groups, and the two groups of magnets correspond to the two coils one by one.

[0008] The above-mentioned closed-loop motor with a separated conductive spring structure has an inverted U-shaped magnetic conductive sheet added to the outside of the magnet, and the magnet is fixed to the inner surface of a side wall I of the U-shaped magnetic conductive sheet. The outer surface of the side wall I is connected and fixed to the outer shell, and the side wall II opposite to the side wall I does not contact the magnet and the coil. The top surface side of the carrier is provided with an avoidance groove corresponding to the side wall II.

[0009] The above-mentioned closed-loop motor with a separated conductive spring structure, the carrier is not provided with a side opening of the coil and a Hall magnet is arranged in the hole, the side retaining wall of the base is provided with a hollow structure corresponding to the side of the Hall magnet, and the circuit board is provided with a sensor corresponding to the Hall magnet through the hollow structure.

[0010] A circuit conduction method for a closed-loop motor as described above, the technical key points of which are: the circuit board supplies power or transmits signals to the motor top side module or functional components through each through-type material strip and each independent spring sheet of the upper spring sheet connected to the through-type material strip, and the circuit board supplies power to the coil through each metal sheet and the lower spring sheet connected to the metal sheet, thereby realizing bidirectional circuit conduction.

[0011] The beneficial effects of the present invention are:

[0012] 1. The traditional upper spring sheet structure is cancelled and made into a separate structure, that is, it is made into a plurality of independent spring sheets for circuit and signal conduction on the motor roof side. A soldering pad is arranged on the inner connection frame of the independent spring sheet, and other modules or functional components are connected through the soldering pad. The outer connection frame of the independent spring sheet is connected to the circuit board through a through-type material strip, 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 motor roof side. The circuit board is electrically connected to the coil through a metal sheet and a lower spring sheet to supply power to the coil and realize circuit conduction on the base side, thereby realizing a two-way conduction mode together with the circuit connection structure on the motor roof side, solving the problem that the existing voice coil motor can only be conducted on one side.

[0013] 2. The separate structure of the upper spring is conducive to the miniaturization design of electronic products. At the same time, the processing technology is simple, the production cost is low, and the versatility is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic diagram of the structure of the motor of the present invention;

[0015] Figure 2 is an exploded schematic diagram of the motor of the present invention;

[0016] Figure 3 It is an assembly diagram of the carrier, base, and circuit board of the present invention;

[0017] Figure 4 is a schematic diagram of the structure of the carrier of the present invention;

[0018] Figure 5 It is a schematic diagram of the connection structure of the upper spring sheet structure and the through-type material belt of the present invention;

[0019] Figure 6 It is a schematic diagram of the circuit conduction of the present invention;

[0020] Figure 7 It is a structural schematic diagram of the carrier, U-shaped magnetic conductive sheet, magnet and coil of the present invention;

[0021] Figure 8 It is a schematic diagram of the assembly of the carrier, the lower spring sheet and the coil of the present invention;

[0022] Fig. 9 It is a schematic diagram of the arrangement of various through-type material strips and metal sheets on the base of the present invention.

[0023] In the figure: 1. shell, 101. avoidance gap, 2. carrier, 201. avoidance groove, 3. upper spring piece, 301. soldering pad, 302. inner connection frame, 303. string part, 304. outer connection frame, 4. circuit board, 5. U-shaped magnetic conductive sheet, 6. magnet, 7. coil, 701. connection point, 8. lower spring piece, 801. lower spring sheet, 802. welding part, 9. base, 10. sensor, 11. Hall magnet, 12. metal sheet, 13. through-type material strip. DETAILED DESCRIPTION

[0024] The present invention is described in detail below in conjunction with the accompanying drawings.

[0025] like Figure 1-Figure 9 As shown, the closed-loop motor with a separated conductive spring structure includes a shell 1, a carrier 2, a base 9, a coil 7 arranged on the carrier 2, a magnet 6 arranged corresponding to the coil 7, an upper spring 3 connected to the top surface of the carrier 2, a lower spring 8 connected between the bottom surface of the carrier 2 and the base 9, and a circuit board 4 located between the base 9 and the shell 1.

[0026] Among them, the upper spring piece 8 is a separate structure, which is composed of a plurality of independent spring pieces for the motor roof side circuit and signal conduction. Each independent spring piece is composed of an inner connection frame 302 connected to the carrier 2, an outer connection frame 304 connected to the top surface of the side retaining wall of the base 9, and a string part 303 connected between the inner and outer connection frames. The upper surface of the inner connection frame 302 is provided with a soldering pad 301. The outer shell 1 is provided with an avoidance notch 101 at the position corresponding to the soldering pad 301. A plurality of through-type material strips 13 are injection-molded in the base 9, and the number of the through-type material strips 13 is equal to the number of independent spring pieces and corresponds one to one. One end of each through-type material strip 13 extends from the side retaining wall of the base 9 to the top surface of the side retaining wall and is connected to the outer connection frame 304 of the corresponding independent spring piece, and the other end of the through-type material strip 13 is connected to the circuit board 4. The lower spring sheet 8 is provided with a welding portion 802 connected to the connection point 701 of the coil 7 . A metal sheet 12 is injection-molded in the base 9 . One end of the metal sheet 12 is connected to the lower spring sheet 8 , and the other end is connected to the circuit board 4 .

[0027] In this embodiment, the inner connection frame 302 and the outer connection frame 304 of each independent spring sheet are connected to the side retaining wall of the carrier 2 and the base 9 respectively by riveting column positioning to increase the connection strength between the independent spring sheet and the carrier and the base, and the riveting column position is covered with glue. The number of the coils 7 is two, and the symmetrical sides are wound around the two opposite sides of the carrier 2. The number of the magnets 6 is four, arranged in groups of two up and down, divided into two groups, and the two groups of magnets 6 correspond to the two coils 7 one by one. An inverted U-shaped magnetic conductive sheet 5 is added to the outside of each group of magnets 6, and the magnet 6 is fixed to the inner surface of a side wall I of the U-shaped magnetic conductive sheet 5. The outer surface of the side wall I is connected and fixed to the outer shell 1, and the side wall II opposite to the side wall I does not contact the magnet 5 and the coil 7. The apex side of the carrier 2 is provided with an avoidance groove 201 corresponding to the side wall II. The setting of the U-shaped magnetic conductive sheet 5 enhances the electromagnetic driving force along the optical axis.

[0028] The carrier 2 is not provided with a side opening of the coil and a Hall magnet 11 is provided in the hole, the side retaining wall of the base 9 is provided with a hollow structure corresponding to the side of the Hall magnet 11, and the circuit board 4 is provided with a sensor 10 corresponding to the Hall magnet 11 through the hollow structure. By detecting the strength of the magnetic field generated by the Hall magnet 11, the sensor 10 generates an electrical signal for transmission, so as to control the displacement of the carrier 2 according to the current size of the coil 7.

[0029] The circuit conduction method of the closed-loop motor described in the present invention, wherein the circuit board 4 transmits power or signals to the motor top side module or functional components through each through-type material strip 13 and each independent spring sheet of the upper spring sheet 3 connected to the through-type material strip 13, and the circuit board 4 transmits power to the coil 7 through each metal sheet 12 and the lower spring sheet 8 connected to the metal sheet 12, thereby realizing bidirectional circuit conduction. In this embodiment, the number of independent spring sheets is 4, and the number of through-type material strips 13 is 4, so the circuit board 4 has 4 conduction paths to the motor top side; the lower spring sheet 8 is composed of two symmetrically arranged lower spring sheets 801, each lower spring sheet 801 corresponds to the coil 7 one by one, the number of metal sheets 12 is 2 and corresponds to the lower spring sheets 801 one by one, and the circuit board 4 supplies power to the two coils 7 respectively through the metal sheets 12 and the corresponding lower spring sheets 801.

[0030] 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 closed-loop motor with a separated conductive spring structure, comprising a housing, a carrier, a base, a coil disposed on the carrier, a magnet arranged corresponding to the coil, an upper spring connected to the top surface of the carrier, a lower spring connected between the bottom surface of the carrier and the base, and a circuit board located between the base and the housing, characterized in that: The upper spring piece is a separate structure, which is composed of a plurality of independent spring pieces for the motor roof side circuit and signal conduction, each independent spring piece is composed of an inner connection frame connected to the carrier, an outer connection frame connected to the top surface of the base side retaining wall, and a string part connected between the inner and outer connection frames. A welding pad is provided on the upper surface of the inner connection frame, and an avoidance notch is provided at the position corresponding to the welding pad of the outer shell. A plurality of through-type material strips are injection-molded in the base, and the number of the through-type material strips is equal to the number of independent spring pieces and corresponds one to one. One end of each through-type material strip extends from the side retaining wall of the base to the top surface of the side retaining wall and is connected to the outer connection frame of the corresponding independent spring piece, and the other end of the through-type material strip is connected to the circuit board. A welding part connected to the wiring part of the coil is provided on the lower spring piece, and a metal sheet is injection-molded in the base, one end of the metal sheet is connected to the lower spring piece, and the other end is connected to the circuit board. The number of the coils is two, and the symmetrical sides are wound around two opposite sides of the carrier. The magnets are divided into two groups, and the two groups of magnets correspond to the two coils one by one. An inverted U-shaped magnetic conductive sheet is added to the outside of the magnet, and the magnet is fixed to the inner surface of a side wall I of the U-shaped magnetic conductive sheet. The outer surface of the side wall I is connected and fixed to the outer shell, and the side wall II opposite to the side wall I does not contact the magnet and the coil. The top surface side of the carrier is provided with an avoidance groove corresponding to the side wall II.

2. The closed-loop motor with a split-conduction spring structure 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 side retaining wall of the base is provided with a hollow structure corresponding to the side of the Hall magnet, and the circuit board is provided with a sensor corresponding to the Hall magnet through the hollow structure.

3. A circuit conducting method for a closed-loop motor as claimed in claim 1 or 2, characterized in that: The circuit board supplies power or transmits signals to the motor top side module or functional components through each through-type material strip and each independent spring piece of the upper spring piece connected to the through-type material strip. The circuit board supplies power to the coil through each metal sheet and the lower spring piece connected to the metal sheet, thereby realizing bidirectional circuit conduction.

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