JP3179135U - Voice coil motor - Google Patents

Abstract

A voice coil motor convenient for assembly and processing is provided. The voice coil motor includes a holder, an upper elastic piece, a lower elastic piece, a plurality of magnets, a bottom seat, and a conductive unit. The holder has a main body and a coil surrounding the main body. The upper elastic piece is located at the top of the main body. The lower elastic piece is located at the bottom of the main body and has a fixing portion and a braking portion. The braking part is in close contact with the bottom of the main body. The magnet is disposed outside the coil. The conductive unit is disposed between the lower elastic piece and the bottom seat, and has a contact surface and two conductive connection pins. The contact surface is in contact with the fixed portion of the lower elastic piece. The two conductive connection pins are integrally formed on the contact surface. Therefore, the difficulty of assembling the voice coil motor can be reduced.
[Selection] Figure 4

Description

  The present invention relates to a linear DC motor, and more particularly to a voice coil motor.

  The voice coil motor is a kind of linear direct current motor, and is an actuator composed of a permanent magnet and a field coil, and having a direct drive and constant stroke characteristics. The voice coil motor is not only simple in principle and structure but also has a particularly short stroke and is suitable for position control with high accuracy, so it is often applied to an AF system of a camera with a built-in mobile phone.

  As voice coil motors are miniaturized as cellular phone accessories become lighter and thinner, the difficulty of assembly increases, making it difficult to mount by hand.

  As shown in FIGS. 1 and 2, the conventional voice coil motor includes a base 1, two conductive connection pins 2, and a conductive elastic piece 3. The conductive connection pin 2 is fitted into the hole 4 of the bottom seat 1 by a human hand. However, since the conductive connection pin 2 is very small, it is difficult to process in the assembly process. Moreover, when the assembly tolerance is too large, the difficulty of welding between the conductive connecting pin 2 and the external power source increases. Furthermore, since the conductive connecting pin 2 is welded to the conductive elastic piece 3 with the top surface 5 having a very small area, the processing is difficult and the defect rate is relatively high.

  As described above, the conventional voice coil motor has a structural design defect and needs to be improved.

  The main object of the present invention is to provide a voice coil motor that is convenient for assembly and processing.

In order to achieve the above object, a voice coil motor according to the present invention includes a holder, an upper elastic piece, a lower elastic piece, a plurality of magnets, a bottom seat, and a conductive unit.
The holder has a main body and a coil surrounding the main body. The body has a top and a bottom. The upper elastic piece is located at the top of the main body. The lower elastic piece is located at the bottom of the main body, and includes a fixing portion, a braking portion, and a plurality of connecting portions connected between the fixing portion and the braking portion. The braking part is in close contact with the bottom of the main body. The magnet is disposed outside the coil. The bottom seat is positioned below the lower elastic piece. The conductive unit is disposed between the lower elastic piece and the bottom seat, and has a contact surface and two conductive connection pins. The contact surface is in contact with the fixed portion of the lower elastic piece. The two conductive connection pins are integrally formed on the contact surface.

In the present invention, since the conductive connecting pin is integrally formed on the contact surface, and the contact surface has a relatively large area that contacts the fixed portion of the lower elastic piece, there is poor contact between the conductive unit and the lower elastic piece. Is unlikely to occur.
On the other hand, when the conductive connection pins are integrally formed on the contact surface, the relative position between the conductive connection pins is fixed and the volume of the entire conductive unit is increased. In addition to facilitating the work of assembling the bottom seat, the automation of the manufacturing process can reduce human work and increase the proportion of conforming products.

It is an exploded view showing a conventional voice coil motor. It is an exploded view which shows the bottom seat and lower elastic piece of the conventional voice coil motor. 1 is a perspective view illustrating a voice coil motor according to an embodiment of the present invention. 1 is an exploded view showing a voice coil motor according to an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view (one) showing row-shaped conductive unit parts according to an embodiment of the present invention. It is a perspective view (2) which shows the row-shaped electroconductive unit parts in one Embodiment of this invention. It is a perspective view which shows the state which row | line | column-shaped electroconductive unit parts and the base in one Embodiment of this invention couple | bonded. It is a perspective view (1) which shows the step which attaches the bottom elastic piece in one embodiment of the present invention to a bottom seat and a conductive unit. It is a perspective view (2) which shows the step which attaches the lower elastic piece in one Embodiment of this invention to a base seat and an electroconductive unit. It is a perspective view (1) which shows the step which attaches the line-like upper elastic piece part to the semi-finished product of a voice coil motor in one embodiment of the present invention. It is a perspective view (2) which shows the step which attaches the line-shaped upper elastic piece part in one Embodiment of this invention to the semi-finished product of a voice coil motor. 1 is a horizontal sectional view illustrating a voice coil motor according to an embodiment of the present invention. 1 is a vertical sectional view illustrating a voice coil motor according to an embodiment of the present invention. 1 is a schematic diagram of a magnetic circuit of a voice coil motor according to an embodiment of the present invention.

Hereinafter, a voice coil motor according to the present invention will be described with reference to the drawings.
As shown in FIGS. 3 and 4, a voice coil motor according to an embodiment of the present invention includes a holder 10 having a main body 11 and a coil 12 surrounding the main body 11, an upper elastic piece 20 positioned on the top of the main body 11, and Between the lower elastic piece 30 located at the bottom of the main body 11, the plurality of magnets 40 arranged outside the coil 12, the bottom seat 50 located below the lower elastic piece 30, and between the lower elastic piece 30 and the bottom seat 50. And a conductive unit 60 disposed on the surface.

  The main body 11 of the holder 10 has a coupling hole 13 and a thread formed on the wall surface of the coupling hole 13. The optical lens (not shown in the figure) is fastened to the coupling hole 13 by a screw thread. When the coil 12 located in the magnetic field is energized, the holder 10 moves along the axial direction of the coil 12 by the Lorentz force action, and adjusts the focal point of the optical lens. Here, “axial direction” and “radial direction” refer to the axial direction and radial direction of the coil 12.

The upper elastic piece 20 and the lower elastic piece 30 are made of a conductive metal and are electrically connected to the coil 12 to form a circuit.
The lower elastic piece 30 includes a fixing portion 31, a braking portion 32, and a plurality of connecting portions 33 connected between the fixing portion 31 and the braking portion 32. The braking unit 32 is in close contact with the bottom of the main body 11 and is electrically connected to the coil 12. In the present embodiment, the lower elastic piece 30 includes lower elastic piece units 30a and 30b spaced from each other. The lower elastic piece units 30a and 30b each have a fixing portion 31, a braking portion 32, and a connecting portion 33.
The upper elastic piece 20 has a fixed portion 21, a braking portion 22, and a plurality of connecting portions 23 connected between the fixed portion 21 and the braking portion 22 in the same manner as the lower elastic piece 30, but is not limited thereto. However, the structure may not be the same as that of the lower elastic piece 30. Since the braking portion 22 of the upper elastic piece 20 is in close contact with the top of the main body 11, when the holder 10 moves in the axial direction, the braking portion 22 of the upper elastic piece 20 or the braking portion 32 of the lower elastic piece 30 receives an external force. An elastic force is supplied to the holder 10. When the elastic force and the Lorentz force coincide with each other, the holder 10 is fixed at a specific upper position in the axial direction.

  The present invention places the coil 12 in the magnetic field generated by the magnet 40 by arranging the magnet 40. Since the bottom seat 50 is made of plastic, it cannot conduct electricity. The conductive unit 60 includes two conductive unit parts 60a and 60b. The conductive unit parts 60a and 60b have a contact surface 61, a plurality of lower claw portions 62 protruding upward, and two conductive connection pins 63 used for connection to an external power source. The contact surface 61 contacts the fixed portion 31 of the lower elastic piece 30. The conductive unit 60 is electrically connected to the lower elastic piece 30. Each of the plurality of lower claws 62 is positioned on the radial direction of the holder 10 and between the coil 12 and the main body 11 and faces one magnet 40 on the radial direction.

  The present invention fixes the relative position between the two conductive connection pins 63 by integrally molding the two conductive connection pins 63 and the lower claw portion 62 to the contact plate 61, and the volume of the entire conductive unit 60 is increased. In addition to increasing the processing difficulty, the conductive unit 60 and the bottom seat 50 can be assembled by automated equipment. Detailed explanation is as follows.

As shown in FIG. 5, when the conductive unit 60 is manufactured, the metal plate is subjected to the first press work to cut off an excess portion, thereby manufacturing a line-shaped part having a plurality of conductive unit prototypes 60 ′. At this time, the plurality of conductive unit prototypes 60 ′ are connected and fixed to each other by the connecting belt 64.
Subsequently, as shown in FIG. 6, if the lower claw portion 62 and the conductive connection pin 63 are refracted in a predetermined direction by performing a second press process on the row-shaped parts, the lower claw The part 62 and the conductive connection pin 63 are integrally formed on the contact surface 61, and the row-shaped part 65 in which the plurality of conductive units 64 are connected by the connecting belt 64 can be manufactured.

Subsequently, the row-shaped part 65 and the mold for molding the bottom seat 50 (not shown in the drawing) are combined, and then the molding mold is subjected to injection processing. 60 is solidified. Subsequently, when the connecting belt 64 is cut off, an independent structure in which the bottom seat 50 and the conductive unit 60 are assembled is completed.
The process of assembling the bottom seat 50 and the conductive unit 60 by such a method not only greatly reduces human work and facilitates speed production and mass production, but also occurs when assembling minute parts by human hands. It is possible to reduce human error and improve the ratio of conforming products.

  In order to improve the bondability and stability between the conductive unit 60 and the lower elastic piece 30, a plurality of rivets 611 protruding upward as shown in FIG. Are arranged on the contact surface 61 and a plurality of holes 311 used for penetrating the rivet 611 are arranged in the fixing portion 31 of the lower elastic piece 30. Subsequently, as shown in FIG. 9, the rivet 611 is deformed by pressing and is fixed around the hole 311. At this time, the lower elastic piece 30 and the conductive unit 60 are coupled and fixed.

  As shown in FIGS. 3 and 4, the voice coil motor according to the present invention further includes a magnetic induction housing 70. The magnetic induction housing 70 is formed on the annular housing 71, a plurality of shielding plates 72 corresponding to the magnets 40, a plurality of upper claw portions 73 formed extending downward from the shielding plate 72, and the housing 71. A plurality of fitting grooves 711. The bottom seat 50 has a plurality of hooks 51. The hook 51 is hooked in the fitting groove 711 to fix the relative position between the magnetic induction housing 70 and the bottom seat 50.

  In the present embodiment, the upper elastic piece 20 is assembled to fix the fixing portion 21 of the upper elastic piece 20 to the top surface of the shielding plate 72, that is, the outer side of the magnetic induction housing 70, instead of the inside of the magnetic induction housing 70. You can make your work easier. Detailed explanation is as follows.

As shown in FIG. 10, a plurality of upper elastic pieces 20 are connected by a connecting belt 24 to manufacture a row-shaped part 25. The connecting belt 24 is not limited to the shape shown in the drawings.
On the other hand, in this embodiment, the line-shaped parts 25 are manufactured by press working, the hole 221 is disposed in the braking portion 22 of the upper elastic piece 20, the plurality of columnar bodies 111 are disposed on the top of the main body 11 of the holder 10, and The construction shown in FIG. 11 is configured by joining the line-shaped parts 25 and the semi-finished products 100 of the plurality of voice coil motors, inserting the columnar body 111 through the hole 221 and fixing it to the upper elastic piece 20. After that, if the connecting belt 24 is cut off and the plurality of upper elastic pieces 20 are separated from each other, the assembly work of the upper elastic pieces 20 can be completed.

  The features of the work method described above are as follows. The magnetic induction housing 70 is located below the upper elastic piece 20. The magnetic induction housing 70 and the base 50 are connected in advance, and the upper elastic piece 20 is assembled into the row-shaped parts 25 to fix the holder 10, the lower elastic piece 30, the magnet 40, and the conductive unit 60, and the assembly work is performed in order. In addition, the burden of the work of assembling and fixing the upper elastic pieces 20 one by one can be eliminated, and the production efficiency can be improved.

As shown in FIGS. 12 and 13, in order to improve the magnetic flux efficiency, in this embodiment, the lower edge of the casing 71 of the magnetic induction housing 70 and the outside of the contact surface 61 of the conductive unit 60 are mutually connected. The upper claw portion 73 is positioned inside the housing 71, and the upper claw portion 73 and one lower claw portion 62 are made to correspond to each other.
As a result, a magnetic space is generated between the casing 71, the shielding plate 72, the contact surface 61, the upper claw portion 73, and the lower claw portion 62, and then the magnet 40 and the coil 12 are positioned in the magnetic space. As shown in FIG. 14, a magnetic circuit that is hermetically sealed is generated. Therefore, not only can the magnetic flux efficiency be maximized, but the magnetic resistance is low, the magnetic leakage is small, and the excitation rate is high.

As shown in FIGS. 12 to 14, in order to provide a magnetic field with an average magnetic flux density, the magnet 40 has a north pole plane 41 in which the north pole takes a planar shape. The upper claw portion 73 and the lower claw portion 62 that correspond to each other have a planar shape and are parallel to the north pole plane 41. The coil 12 has a plurality of action parts 121 located between the magnet 40, the upper claw part 73 and the lower claw part 62. The action site 121 is parallel to the north polar plane 41.
At this time, since a homogeneous magnetic field is generated between the magnet 40, the upper claw part 73, and the lower claw part 62, the coil 12 is always located in the homogeneous magnetic field in the process of moving in the axial direction together with the holder 10, and the magnetic constant ( K _{f, that} is, the product of the length of the conductive wire and the magnetic flux area, can be kept constant. Therefore, the present invention has convenience when controlling the operation of the voice coil motor.

  In the present embodiment, the upper claw portion 73 and the lower claw portion 62 are not only arranged for use in magnetic induction, but also correspond to the plurality of recessed grooves 112 formed to extend along the axial direction on the main body 11. Placed in. On the other hand, as shown in FIG. 12, the holder 10 is prevented from rotating by fitting one upper claw portion 73 and one lower claw portion 62 corresponding to each other into the recessed groove 112, or at least the width of rotation is greatly increased. Can be reduced.

As shown in FIGS. 4 and 13, the voice coil motor according to the present embodiment further includes a dust cap 80 in order to block dust and fix the relative position between the units.
The dust cap 80 is disposed above the magnetic induction housing 70 and has a plurality of hooks 81. The hook 81 protrudes downward and is caught by the fitting groove 711 of the magnetic induction housing 70 and fixed. The upper elastic piece 20 is sandwiched and fixed between the dustproof cap 80 and the magnetic induction housing 70.
On the other hand, the dust cap 80 has a plurality of columnar fixing portions 82 protruding further downward. The shielding plate 72 has a plurality of perforations 721 used to penetrate the columnar fixing portion 82. The columnar fixing portion 82 abuts on the top surface 42 of one magnet 40. Since there is a gap between the top surface 42 of the magnet 40 and the shielding plate 72, there is convenience when the axial position of the magnet 40 is fixed.

  As described above, the voice coil motor according to the present invention is convenient for assembling and processing, has excellent performance for controlling operation, and is economically efficient.

  As mentioned above, this invention is not limited to the said embodiment at all, In the range which does not deviate from the meaning of invention, it can be implemented with a various form.

1: Bottom seat
2: Conductive connection pin
3: Conductive elastic piece
4: Hole
5: Top surface
10: Holder
11: Body
111: Columnar body
112: Sink groove
12: Coil
121: Action site
13: Bonding hole
20: Upper elastic piece
21: Fixed part
22: Braking part
221: hole
23: Connection site
24: Connection belt
25: Row parts
30: Lower elastic piece
30a, 30b: Lower elastic piece unit
31: Fixed part
311: hole
32: Braking part
33: Connection site
40: Magnet
41: Arctic plane
42: Top surface
50: Bottom seat
51: Hook
60: Conductive unit
60a, 60b: Conductive unit parts
60 ': Conductive unit prototype
61: Contact surface
611: Rivet
62: Lower nail
63: Conductive connection pin
64: Connection belt
65: Row parts
70: Magnetic induction housing
71: Body
711: Mating groove
72: Shield plate
721: perforation
73: Upper nail
80: Dust-proof cap
81: Hook
82: Columnar fixing part
100: Semi-finished product of voice coil motor

Claims (9)

A holder, an upper elastic piece, a lower elastic piece, a plurality of magnets, a bottom seat and a conductive unit, wherein the holder is composed of a main body having a top and a bottom, and a coil surrounding the main body;
The upper elastic piece is located at the top of the main body,
The lower elastic piece has a fixing part, a braking part, and a plurality of connecting parts connected between the fixing part and the braking part, located at the bottom part of the main body.
The braking portion is in close contact with the bottom portion of the main body,
The magnet is disposed outside the coil;
The bottom seat is located below the lower elastic piece,
The conductive unit is disposed between the lower elastic piece and the bottom seat, and has a contact surface and two conductive connection pins,
The contact surface contacts the fixed portion of the lower elastic piece,
The voice coil motor, wherein the two conductive connecting pins are integrally formed on the contact surface. The voice coil motor further includes a magnetic induction housing,
The magnetic induction housing has an annular housing, a plurality of shielding plates corresponding to the magnets, and a plurality of upper claw portions formed extending downward from the shielding plate,
The contact surface has a plurality of lower claws protruding upward,
The lower claw portion is integrally formed with the contact surface, and is positioned on the radial direction of the holder and between the coil and the main body, and faces the one magnet on the radial direction,
The lower edge of the housing and the outside of the contact surface of the conductive unit are in contact with each other, and the upper claw portion is located inside the housing and corresponds to one lower claw portion. ,
Between the shielding plate, the contact surface, the housing, the upper claw portion and the lower claw portion has a magnetic space,
The voice coil motor according to claim 1, wherein the magnet and the coil are located in the magnetic space. The magnet has an arctic plane;
The upper claw part and the lower claw part corresponding to each other have a planar shape, and are parallel to the Arctic plane,
The coil has a plurality of action sites located between the magnet, the upper claw portion and the lower claw portion,
The voice coil motor according to claim 2, wherein the action portion is parallel to the north pole plane. The main body has a plurality of recessed grooves formed extending in the axial direction,
The voice coil motor according to claim 2, wherein the recessed groove can store one upper claw portion and one lower claw portion corresponding to each other. The voice coil motor is further equipped with a dust cap,
The dust cap is arranged above the magnetic induction housing and has a plurality of columnar fixing portions protruding downward.
The upper elastic piece is positioned between the dust cap and the magnetic induction housing,
The shielding plate has a plurality of perforations used for penetrating the columnar fixing portion,
The columnar fixing portion is in contact with the top surface of one of the magnets,
The voice coil motor according to claim 2, wherein there is a gap between the top surface of the magnet and the shielding plate. The dust cap has a plurality of hook portions protruding further downward,
The housing of the magnetic induction housing has a plurality of fitting grooves,
The voice coil motor according to claim 5, wherein the hook portion is fixed by being caught in the fitting groove.   The voice coil motor according to claim 6, wherein the bottom seat has a plurality of hook portions that are hooked and fixed in the fitting groove. The upper elastic piece includes a fixing portion, a braking portion, and a plurality of connecting portions connected between the fixing portion and the braking portion.
The fixing portion is fixed to the top surface of the shielding plate,
The voice coil motor according to claim 2, wherein the braking portion is in close contact with the top portion of the main body. The abutment surface has a plurality of rivets protruding upwardly,
The fixing portion of the lower elastic piece has a plurality of holes used for penetrating the rivet,
2. The voice coil motor according to claim 1, wherein the rivet is deformed by receiving pressure to couple and fix the lower elastic piece and the conductive unit.

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