CN108023428B

CN108023428B - Electromagnetic driver

Info

Publication number: CN108023428B
Application number: CN201711295792.XA
Authority: CN
Inventors: 王弘临
Original assignee: TDK Taiwan Corp
Current assignee: TDK Taiwan Corp
Priority date: 2014-04-08
Filing date: 2014-04-08
Publication date: 2020-07-31
Anticipated expiration: 2034-04-08
Also published as: CN108023427B; CN104979992A; CN108023427A; CN108023428A; CN104979992B

Abstract

The invention proposes an electromagnetic drive comprising: an outer frame; a coil seat having non-conductive material and used for carrying a lens; a coil; the coil and the magnetic component are used for driving the coil holder to move relative to the outer frame; a conductive element; and a metal connecting piece, set in the coil base and connected with the coil and the conductive assembly, wherein a part of the metal connecting piece is embedded in the coil base, and the metal connecting piece has a first connecting end and a second connecting end, the first connecting end is exposed outside the coil base, and the extending direction of the first connecting end is different from the second connecting end.

Description

Electromagnetic driver

The invention is directed to the parent application (title of the invention: coil lead-out structure of electromagnetic driver; divisional application proposed by application number: 201410138277.0).

Technical Field

The present invention relates to a coil wire lead-out structure of an electromagnetic driver, and more particularly, to a coil wire lead-out structure of an electromagnetic driver such as a Voice Coil Motor (VCM), an electromagnetic Actuator (Actuator), or the like.

Background

For example, fig. 1 is a schematic view of a lens focusing structure with hand vibration prevention and fig. 2 is a schematic view of a cross section a-a of fig. 1, in which a Voice Coil Motor (VCM) and an electromagnetic Actuator (Actuator) are commonly used for controlling a camera lens, that is, a voice coil motor 100 is used for focusing control of the distance (Z axis) of the lens, and an electromagnetic Actuator 110 is used for image correction (X-Y axis) of the hand vibration of the lens. However, when the coil wire of the conventional electromagnetic driver is connected to the related conductive element (e.g., the spring), the coil wire is soldered to the conductive element, and the conductive element is connected to the driving circuit to conduct the driving current to the coil for excitation.

However, the size of many electromagnetic drivers used in mobile phones and cameras is relatively small, the difficulty of welding coil wires is relatively increased, and the coil wires need to be welded one by one manually, which cannot be manufactured by automation. Taking a Voice Coil Motor (VCM) manufacturing process used in a focus lens as an example, the VCM 100 shown in fig. 2 includes a lens holder 101, a lens 102 is disposed inside the lens holder 101, a coil 103 is surrounded outside the lens holder 101, and a spring plate 104 and a spring plate 105 are respectively connected to the lens holder 101. In the process, the lower spring plate 105 needs to be assembled on a base 106, the lens holder 101 is connected with the lower spring plate 105, the coil 103 is sleeved outside the lens holder 101, the lead-out wire of the coil 103 is welded on the lower spring plate 105, and subsequent assembly of other components can be performed after the assembly is completed. Therefore, when the lead-out wires of the coil 103 are soldered to the lower spring plate 105, the process needs to be performed manually, which is inconvenient in terms of process.

Disclosure of Invention

The invention mainly aims to solve the defect that the connection of coil leads of the traditional electromagnetic driver cannot be automatically produced, manufactured and maintained difficultly, and therefore the invention provides an improved electromagnetic driver.

To achieve the above object, the present invention provides an electromagnetic driver, including:

an outer frame;

a coil seat having non-conductive material and used for carrying a lens;

a coil;

the coil and the magnetic component are used for driving the coil holder to move relative to the outer frame;

a conductive element; and

a metal connecting piece, which is arranged on the coil base and connects the coil and the conductive component, wherein a part of the metal connecting piece is embedded in the coil base, and the metal connecting piece is provided with a first connecting end and a second connecting end, the first connecting end is exposed out of the coil base, and the extending directions of the first connecting end and the second connecting end are vertical to each other.

Wherein, the metal connecting piece is embedded on the coil base by plastic injection molding of the coil base.

Wherein, the leading-out wire of the coil is wound on the first metal connecting end of the metal connecting piece.

Wherein the second metal connection end extends along the optical axis direction of the lens.

The extending direction of the first metal connecting end is not parallel to the optical axis of the lens.

Wherein, the conductive component is electrically connected with the metal connecting piece and the coil.

Wherein, the conductive component and the metal connecting piece are fixed in a welding mode.

The conductive assembly and the metal connecting piece are fixed in a dispensing mode.

The second connecting end is provided with a clamping hook, the conductive component is provided with a clamping groove hole, and the clamping hook extends into the clamping groove hole to be mutually clamped and connected.

The electromagnetic driver further comprises an electrical pin electrically connected to the conductive element.

In order to achieve the above object, the present invention provides a coil lead-out structure of an electromagnetic driver, wherein a coil assembly of the electromagnetic driver at least includes at least one coil seat and at least one coil, and is disposed on the coil seat, the coil seat is provided with a plurality of metal connectors, each metal connector has a first connection end and a second connection end, the first connection end is electrically connected to a lead-out wire of the coil, and the second connection end is electrically connected to a conductive assembly; at least one magnetic component and the coil component are correspondingly arranged and are not contacted with each other, when current passes through the coil, an electromagnetic field is generated, and an electromagnetic driving force is generated between the magnetic component and the magnetic component to carry out excitation actuation.

The present invention provides a coil lead-out structure of the electromagnetic driver, wherein if the coil is a fixed component (or called stator), the magnetic component is an actuating component (or called rotor) disposed at the hollow-out position of the center of the coil base; if the coil is a mover, the magnetic assembly is a stator, and the magnetic assembly is correspondingly disposed outside the coil, such as on the upper side or the lower side, or around the outside of the coil.

Another technical feature of the present invention is to provide the coil wire leading-out structure of the electromagnetic driver, wherein the coil base is formed by integrally embedding the metal connecting member on the coil base during plastic injection molding, or the coil base is provided with a plurality of embedding slots, and the metal connecting member can be correspondingly inserted into the embedding slots.

The present invention also provides a coil lead-out structure of the electromagnetic actuator, wherein the lead-out end of the coil is wound on the first connecting end of the metal connecting member and then welded.

The present invention is further characterized in that the electromagnetic driver coil lead-out structure is provided, wherein the second connection end of the metal connecting member is welded to the conductive assembly, or the second connection end and the conductive assembly are respectively provided with corresponding hook structures, so that the second connection end and the hook structures of the conductive assembly are correspondingly connected with each other.

The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.

Drawings

FIG. 1 is a schematic diagram of an external view of a conventional anti-shake lens auto-focusing device;

FIG. 2 is a schematic sectional view taken along line A-A of FIG. 1;

FIG. 3A is an exploded view of a coil assembly of an embodiment of the present invention;

FIG. 3B is the combination diagram of FIG. 3A;

FIG. 3C is an enlarged view of a portion A of FIG. 3B;

FIG. 4A is an exploded view of another coil assembly of the voice coil motor of the present invention;

FIG. 4B is the combination diagram of FIG. 4A;

FIG. 4C is a partial enlarged view of the portion B of FIG. 4B;

FIG. 5 is an enlarged view of a portion of the components of the voice coil motor of the present invention;

FIG. 6 is an exploded view of a portion of an exemplary voice coil motor according to the present invention;

FIG. 7 is an exploded view of an electromagnetic motor according to an embodiment of the present invention;

FIG. 8A is an exploded view of an electromagnetic actuator according to an embodiment of the present invention; and

fig. 8B is an exploded view of a portion of the assembly of fig. 8A.

Wherein the reference numerals

100 voice coil motor

110 electromagnetic actuator

101 lens mount

102 lens

103 coil

104,105 spring plate

106 base

300,600,700 coil holder

301 outer annular surface

302 side end face

305 embedding groove

310,610,710 Metal connecting piece

311 first connection end

312 second connection end

313 positioning piece

314 hook

320,620,720 coil

321,322 lead-out wires

330 conductive assembly

331 neck hole

332 spring sheet fixing part

335 electric pin

340,640,740 magnetic component

350 outer frame

650 silicon steel ring

800 VCM lens

801 suspension wire

Detailed Description

For a further understanding of the technology, means, and efficacy of the invention to be achieved, reference should be made to the following detailed description of the invention and accompanying drawings which are believed to be a further and specific understanding of the objects, features, and characteristics of the invention, and to the accompanying drawings which are provided for purposes of illustration and description only and are not intended to be limiting of the invention.

The electromagnetic driver of the present invention includes a voice coil motor, an electromagnetic actuator, etc., and the operation modes of the electromagnetic drivers are different, so the present invention will be described by some embodiments, however, the electromagnetic driver of the present invention is not limited to the structure of the illustrated embodiments.

Referring to fig. 3A, an exploded view of a coil assembly of an electromagnetic driver according to an embodiment of the present invention is shown, fig. 3B is an assembly view of fig. 3A, fig. 3C is a partial enlarged view of a portion a of fig. 3B, the present embodiment at least includes a coil holder 300, which may be a lens holder in a hollow-out ring shape, made of a non-conductive material, such as plastic, a lens (not shown) may be placed in the center of the coil holder 300, and the coil holder 300 is provided with 2 metal connecting members 310, which may be embedded on the coil holder 300 in an integrally formed manner with the coil holder 300 when the coil holder 300 is injection-molded with plastic. As shown in fig. 3A, the metal connector 310 includes a positioning element 313 in the semi-finished product, for fixing the metal connector on a mold (not shown) of the coil holder 300, performing plastic molding of the coil holder 300, and removing the positioning element 313 after the plastic molding is completed, as shown in fig. 3B.

As shown in fig. 3C, the metal connecting element 310 has a first connecting end 311 and a second connecting end 312, the first connecting end 311 is located on the outer annular surface 301 of the coil holder 300 and extends outward to protrude the outer annular surface 301. The second connection end 312 is located on one side end face 302 of the coil holder 300, and extends downward to protrude the side end face 302, and the first connection end 311 and the second connection end 312 are approximately perpendicular.

Referring to fig. 4A, which is an exploded view of another coil assembly with a voice coil motor as an embodiment, fig. 4B is an assembly view of fig. 4A, and fig. 4C is a partial enlarged view of part B of fig. 4B, in this embodiment, as shown in fig. 4A, a plurality of embedding slots 305 are formed on a coil base 300 and located on an outer circumferential surface 301 of the coil base 300, and metal connectors 310 are correspondingly inserted into the embedding slots 305, as shown in fig. 4B and fig. 4C, first connection ends 311 of the metal connectors 310 protrude out of the outer circumferential surface 301 of the coil base 300, and second connection ends 312 of the metal connectors 310 extend into the coil base 300 and extend to one side end surface of the coil base 300 (see fig. 3C).

Referring to fig. 3A to 3C and fig. 4A to 4C, in the two embodiments, a coil 320 is hollow in a ring shape and disposed on the outer ring surface 301 of the coil holder 300, and lead wires 321 at two ends of the coil 320 are respectively connected to the 2 metal connecting elements 310, and the lead wires 321 of the coil 320 are wound around the first connecting ends 311 of the metal connecting elements 310 and can be soldered to the first connecting ends 311.

Fig. 5 is a partial enlarged view of a voice coil motor according to an embodiment of the present invention. A conductive element 330, such as a spring plate in the present embodiment, is electrically connected to the second connection end 312 of the metal connection member 310, in the present embodiment, the metal connection member 310 and the conductive element 330 are respectively provided with a hook structure, such as a concave-convex hook 314 at the tail end of the second connection end 312 of the metal connection member 310, a slot 331 is provided on a movable portion (inner ring) of the conductive element 330, such as the spring plate, the hook 314 extends into the slot 331 for hooking connection, and a fixed portion (outer ring) 332 of the spring plate is used to connect an outer frame (as shown in fig. 6) or can be connected with an electrical connector 335. However, the present invention does not limit the connection type of the hook structure, the hook structure has the advantage of convenient assembly and disassembly, and in another embodiment, the hook structure and the hook structure can be directly soldered or fixedly connected by dispensing.

Referring to fig. 6, which is an exploded view of a part of components of a voice coil motor, in the embodiment of fig. 6, the electromagnetic driver of the present invention further includes at least one magnetic component 340, such as four magnets in the present embodiment, which are respectively disposed around the outer sides of the coil 320 and the coil base 300 and are not in contact with the coil 320, a frame 350 can be used to fix the four magnetic components 340, and a spring (not shown) is used to suspend the coil base 300 at the centers of the four magnetic components 340, such that the coil 320 and the coil base 300 in the present embodiment form a component (also called a mover) that acts at the centers of the four magnetic components 340, and the magnetic component 340 forms a fixed component (also called a stator), when a current flows through the coil 320, an electromagnetic field is generated, and an electromagnetic driving force is generated with the magnetic components 340 around, so as to mutually excite, in the embodiment of the voice coil motor of the present invention, the lens in the coil base 300 (mover) can be driven to perform lens focusing movement which is actuated up and down.

Fig. 7 is an exploded view of an electromagnetic motor according to an embodiment of the present invention. In this embodiment, the electromagnetic driver has a plurality of coil holders 600, each coil holder 600 is wound with a coil 620, and at least one coil holder 600 is provided with 2 metal connectors 610, which are electrically connected to the two ends of the coil 620 to lead out wires, and the plurality of coil holders 600 are installed in the concave-convex tooth grooves inside a silicon steel ring 650, the silicon steel ring 650 may be formed by integrally pressing silicon steel, or may be formed by combining a plurality of groups of silicon steel teeth, so that the coil holder 600 forms a central hollow-out shape arranged in a ring, and the magnetic assembly 640 forms a central rotating shaft, and is disposed at the central hollow-out position of the ring coil holder 600, and the magnetic assembly 640 may be a single-phase motor with a single magnet, or a multi-phase motor or a stepping motor with a plurality of magnets, etc. In the present embodiment, the coil base 600, the silicon steel coil 650 and the coil 620 are all stators, and the magnetic element 640 is a mover, so that when a current flows through the coil 620 to excite, a central rotating shaft formed by the magnetic element 640 rotates. In another embodiment (not shown), the plurality of magnetic assemblies 640 may form a stator with a ring-shaped hollow center, and the coil 620 is an electromagnetic motor with a rotor located at the hollow center to form a central shaft.

Fig. 8A is an exploded view of an electromagnetic actuator according to an embodiment of the present invention, and fig. 8B is an exploded view of a middle portion of fig. 8A. In this embodiment, the electromagnetic driver is an electromagnetic actuator moving along X-Y axes, the VCM lens 800 is suspended by four suspension wires 801, four magnetic assemblies 740 are disposed below the VCM lens 800, the coil base 700 is an i-shaped flat plate corresponding to the four coil bases 700, the coil 720 is wound on the coil base 700, and the leads led out from the two ends of the coil 720 are electrically connected to the metal connecting member 710 respectively, and the magnetic assemblies 740 are disposed above or below the coil, so that the coil 720 and the magnetic assemblies 740 can form a stator or a mover respectively, if the coil 720 is a mover, the magnetic assembly 740 is a stator, and if the coil 720 is a stator, the magnetic assembly 740 is a mover, and if a current flows through the coil 720 to be excited, the coil 720 and the magnetic assembly 740 can move horizontally in correspondence to each other. For example, the image correction function of lens anti-shake, such as the X-Y anti-shake image correction in FIG. 1 and FIG. 8A-FIG. 8B, can be used, one set of electromagnetic actuators is used for X-axis correction, and the other set of electromagnetic actuators is used for Y-axis correction.

In summary, the present invention provides a coil lead-out wire structure of an electromagnetic actuator, which can be used in an electromagnetic motor or an electromagnetic actuator composed of a coil and a magnet, so as to automatically manufacture the coil assembly, reduce the trouble of manual welding, facilitate the direct replacement of the coil assembly during maintenance, and achieve the purpose of recycling resources.

The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. An electromagnetic actuator comprising:

an outer frame;

a coil seat having non-conductive material and used for carrying a lens;

a coil;

a conductive element; and

a metal connecting piece, which is arranged on the coil base and connects the coil and the conductive component, wherein a part of the metal connecting piece is embedded in the coil base, and the metal connecting piece is provided with a first connecting end and a second connecting end, the first connecting end is exposed outside the coil base and extends along the direction vertical to the optical axis of the lens, and the extending directions of the first connecting end and the second connecting end are vertical to each other.

2. The electromagnetic actuator according to claim 1, wherein the metal connector is formed by injection molding the coil holder and integrally embedded in the coil holder.

3. The electromagnetic driver according to claim 1, wherein the coil lead-out wire is wound around the first metal connection end of the metal connecting member.

4. The electromagnetic actuator according to claim 1, wherein the second metal connecting end extends along an optical axis direction of the lens.

5. The electromagnetic actuator according to claim 1, wherein the first metal connection end extends in a direction not parallel to the optical axis of the lens.

6. The electromagnetic actuator according to claim 1, wherein the conductive element is electrically connected to the metal connector and the coil.

7. The electromagnetic actuator according to claim 1, wherein the conductive member and the metal connecting member are fixed by welding.

8. The electromagnetic actuator according to claim 1, wherein the conductive element is fixed to the metal connecting member by dispensing.

9. The electromagnetic driver according to claim 1, wherein the second connecting terminal has a hook, and the conductive member has a slot hole, and the hook extends into the slot hole to be hooked to each other.

10. The electromagnetic driver of claim 1, further comprising an electrical pin electrically connected to the conductive element.