TWI354177B - Lens driving mechanism - Google Patents

Description

Lens holder 22 lens driving mechanism 3 coil (conductor coil) 31 electromagnet parts 32 electromagnet (I ) (electromagnet 1) 321 electromagnet (II ) (electromagnet 1 )322 Electromagnet (III) (electromagnet 1) 323 Electromagnet (IV) (electromagnet IV) 324 Electrical plate 33 Coil pad 34 Electromagnet pad 3 5 Electromagnet (I) Electromagnet I pad 3 51 Electromagnet (II) Electrode (electromagnet IIpad) 352 Electromagnet (III) Electrode (electromagnet III pad) 3 5 3 Electromagnet (IV) Electrode (electromagnet IV pad) 3 54 Electromagnet core (electOmagnet ferrite 36 spring element 38 VIII. If there is a chemical formula in this case, please disclose the chemical formula that best shows the characteristics of the invention: (none) 9. Description of the invention: [Technical field of the invention] The present invention relates to a lens shifting mechanism It is applied to an autofocus or zoom lens group, especially a coil and an electromagnet, and is driven and controlled by the electromagnetic force generated between the two. Displacement by sliding the lens. [Prior Art] Currently used digital cameras such as digital cameras, mobile phones with shooting functions, and notebook-type 1354177 brains, there is a miniature lens module with auto-focusing (AF) or zooming. A compact camera module (CCM), and the lens module basically includes a housing formed by an upper cover and a bottom cover; a lens The lens group and a lens holder are sleeved in the cavity and can be slidably displaced back and forth in the direction of the central axis; and a lens displacement mechanism, or It is an actuator, which is mainly used to drive the lens to produce a shifting action on the central axis, thereby achieving the effect of autofocus or zoom. A common lens shifting mechanism is designed, for example, as a piezoelectric motor, which is formed using the principle of a piezoelectric material such as US 7,212,358, US 2003/0227560, JP2006-293083, JP2006-101611. Etc.; however, the piezoelectric materials generally used cannot withstand the high temperature (about 260 °C) of reflow (ref 〇 w) operation or the special piezoelectric materials that are resistant to high temperatures are quite expensive, which is not conducive to mass production or Reduce manufacturing costs. Another type of voice coil motor (VCM) is formed by using a coil, a sound iron, and an elastic member such as a spring or a spring piece, such as US 7,262,927, US 7,196, 978. US 7, 002, 879, US 6, 961, 090, US 6,687, 062, US20070133110, JP2005037865, JP2005258355, W02007026830, etc., most of these conventional techniques use coils and permanent magnets, as shown in Figure 1. If one or a plurality of permanent magnets 70 are arranged in a ring shape around the circumference or the periphery of the coil 31, the coil 31 is energized to generate a magnetic field, and can be formed between the magnetic field and the magnetic pole established by the one or several permanent magnets 70. Up or toward: Electromagnetic. The force drives the lens to move; however, the permanent magnet will demagnetize the magnet when reflowing at a high temperature (about 260 C). Therefore, the conventional piezoelectric motor and the voice coil motor cannot be reflowed during assembly, and the mass production efficiency is limited to four. Furthermore, there is a lens shifting mechanism using a shape memory alloy (SMA), which utilizes the heat-shrinking property of SMA as a driving force source for an actuator such as US 6, 307, 678B2, US 6,449,434B1, US2007058070, US2007047938, JP2005275270, JP2005195998, etc. However, the SMA heat shrinking action is slow, and it is impossible to achieve instant autofocus or zoom effect. For users with high image quality, in order to maintain relatively good mobility and photo quality in a low-light environment, the anti-shake function has received considerable attention. In the prior art, the anti-shake technique is mainly achieved in several ways, such as the imaging element CCD uses a mechanical support to compensate for the image blurring caused by the vibration process by compensating the motion, or as shown in the mirror display. Mechanical structure eliminates jitter, or compensates by software, or = high sensitivity, or uses two gyroscopes to detect horizontal and vertical vibration of imaging element CCD, and uses magnetic push to compensate Etc. 'EP1729509, US20070292119, US20070009243, JP08122840, JP11305280, JP11220651, etc. The use of electromagnetic force is the main source of power for the lens shifting mechanism, with its convenience and versatility. 'The magnetic force can be destroyed at high temperatures (about 26 〇. 〇) during reflow soldering, although special materials can be used to make high temperature resistant permanent Magnets, but they are too expensive, because they are weaker in magnetic force, so they cannot be used universally. Therefore, it is urgent to develop new technologies to solve the problem of re-welding of lens shifting mechanisms. The main object of the present invention is to provide a lens shifting mechanism which is composed of a coil (conductor coil) and an electromagnet set arranged around the coil with respect to the coil, wherein the coil system is fixed to On the lens sleeve, when the coil is moved by force, the lens sleeve and the lens group thereon can be moved along the central axis; the electromagnet group of the lens shifting mechanism can be generated by the electromagnet end face at 1354177 »1 * * electromagnet end face N-pole or S-pole electromagnetic force, the electromagnetic force is generated when the coil is energized. The direction of the electromagnetic force can be determined by the right-hand rule of Ampere, which tends to move the mirror head along the central axis to achieve the zooming purpose of the lens group movement; or when The coil is applied with current in different directions to control the lens in the direction of forward or backward to apply to an autofocus or zoom lens module. The structure can be reflow-resistant and can be mass-produced. It is a modification of the prior art that it is difficult to use a permanent magnet without using a reflow process. It is still another object of the present invention to provide a lens shifting mechanism in which an electric φ magnet group is provided. It is composed of a plurality of electromagnets, which has anti-shake function. It can control the current magnitude or current direction of each electromagnet to make the coil energize and react to different electromagnetic forces, so that the optical axis of the lens and the lens module are The center j generates an offset angle to achieve an anti-shake autofocus or zoom effect against the object. Step, another object of the invention is to provide a lens shifting mechanism that enters an elem mirror or a lens sleeve thereof A spring is placed on the spring to make the relative force of the lens sleeve provide a relative restoring force when the electromagnetic force between the coil and the electromagnet group disappears or is not produced. The original balance state or in-situ to achieve automatic cold, or zoom [Embodiment] The following is a more detailed and detailed description of the present invention, the preferred embodiment and the accompanying drawings, the structure and technical features of the present invention are described in detail as The following embodiments are disclosed for the main constituent elements of the lens shifting of the present invention. Therefore, the present invention is disclosed below, although it is applied to an automatic In the focus or zoom lens module, but in the lens module of the autofocus or zoom function, except for the lens shifting mechanism of the present invention, the other structure is the general notification technique 6 1354177. Therefore, it is generally known in the art that the constituent elements of the autofocus or zoom lens module disclosed in the present invention can be changed by many zm or zoom lenses, for example, the lens module is covered by the upper cover. ^ To the equivalent of the evening 拟 拟 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤 尤The overall shape or structure of the lens composed of the cylinder is not limited, for example, the lens group may comprise a lens group consisting of a single lens or a plurality of lenses, and a single lens or lens group may generally be accommodated.

Forming a lens in a fixing member and then combining with a lens sleeve; or the number of individual coils (such as m) of the coil and electromagnet group of the present invention, the inner diameter of the coil (or the inner diameter of the coil), and the height of the coil The height of the coil in the electromagnet or the direction and size of the current in and out is not limited, and can be calculated according to the calculation formula of Biot-Savart Law and related right-handed law, such as the following formula (1) and formula (2) ) °

B = ^[ 4π J F = ffxB

Idl 乂 f (1) (2) where '5 is the magnetic flux density' from the vacuum permeability (permeability) / is the coil current (^卩), / is the length of the line segment, is the distance, and F is the force. From equations (1) and (2), the magnetic flux density of the electromagnet of the present invention and the magnitude of the force applied to the coil can be separately calculated to match the weight of the lens to design an optimum driving force. 2 and 3, which are perspective views of an embodiment of the present invention, the lens shifting mechanism 3 of the present invention mainly includes a coil 31 and an electromagnet group 32, wherein the coil 31 is fixed to the lens 2 The lens sleeve 22 is combined with a lens group 21 to form a linkage body and can be synchronously moved. The electromagnet group 32 is composed of a plurality of electromagnets as shown in FIG. 3 and is fixed and fixed; Can be controlled by the controller (not shown in Figure 2, Figure 3, 3, 354, 177, Figure 4), such as the camera controller to the coil 31 and electromagnetic out of different directions (inflow or outflow) or different magnitudes of current, magnetic action can be in the electromagnet The force of each of the electromagnets 321 to 324 of the group 32: the magnitude and direction of the magnetic force are determined by the current of the wheel, and the coil 31 inputs the current and generates the electromagnetic force according to the right-hand rule of Ampere, and the coil 31 can be calculated. The size of the magnetic force and the direction of the force, the f-ring 31 will be moved by the force along the axis of the mirror axis to achieve autofocus or coke effect. 4, after the current is output by the controller 37 of the camera, the electromagnet (321) 321 and the electromagnet (ΙΠ) 323 are connected via the electromagnet electrode 35 to the electromagnet group 32 (the electromagnet (π) 322 can be included at the same time. , the electromagnet (IV) 324 ), the electromagnet (I ) 321 and the end face of the electromagnet core 36 of the electromagnet (ΙΠ) α 323 can generate electromagnetic action. If the input current direction is counterclockwise, the electromagnet core 36 is facing the lens. The end face of the central axis 会 generates a bucking electromagnetic; when the controller 37 of the camera outputs a current, when the coil electrode 34 is connected to the coil 31, the coil 31 generates a magnetic field, and if the current of the input coil 31 is counterclockwise, the coil 31 When the electromagnetic force is generated, if the current of the input coil 31 is counterclockwise, the coil 31 receives the electromagnetic force to the object side, and the lens 2 is moved in the object side direction. The lens shifting mechanism 3 of the present invention can further control the current magnitude or current direction of each of the electromagnets 321 to 324 in the electromagnet group 32 to control the magnitude of the magnetic force (or electromagnetic strength) generated by each electromagnet, so that the coil 31 is energized. Because of the different electromagnetic force between each electromagnet (such as 321~324), it is affected by the unbalanced electromagnetic force, so that the optical axis of the lens 2 will produce an angle with the axis of the lens center axis. The angle is shifted to the object to be photographed. As shown in FIG. 5, the electromagnet group 32 of the lens shifting mechanism 3 is composed of an electromagnet (I) 321 and an electromagnet (ΠΙ) 323. Group 32 electromagnet (I) 321 and electromagnet (III) 323 ' have different electromagnetic currents, electromagnet (J) 321 and electromagnet (III) 323 have different electromagnetic forces, and after coil 31 passes current, According to the electromagnetic force of different electromagnetic balance of s 8 1354177 to electromagnet 321 and electromagnet (III) 323, the optical axis of lens 2 will not produce an angle with the lens, so that lens 2 can be photographed oppositely. Object, up to the axis "" shock function.

The electromagnet core 36 of the electromagnet group 32 described above is made of ferrite; the soft magnetic material has easy magnetization and is easy to concentrate on the electromagnet core 36 after the electromagnet group 32 is energized. End face, but when the electromagnet group 32 does not: = the magnetic force of the magnetic core 36 disappears, that is, the ability of the soft magnetic material to be electromagneticized; while the main components of the soft magnetic material can be high-two retaining iron, soft iron, and carbon A very low amount of steel, niobium steel, iron-nickel alloy & iron (cooked Alloy or Permalloys), magnesium-zinc alloy (Mg_Znall〇) ^ : (Ni-Znalloy), manganese-zinc alloy (Mn_Znalloy), or metal broken glass (metallic glass), etc., can withstand reflow high temperature, can not be selected. °"

The lens shifting mechanism 3 of the present invention can further configure a spring 38 having a resilient function on the lens 2. When the electromagnetic force of the coil 31 or the electromagnet group 32 disappears, the spring 38 can provide a relative lens group 21. ^Reinforcement, that is, providing the lens 2 with a spring force opposite to the generated electromagnetic force for returning the lens group 21 to the original position before the electromagnetic force acts; as for the elastic type of the spring 38, such as compression type (c 〇mpressi〇n) spring or extension magazine, structural type such as coil spring or non-coil spring number or set position is not limited, may be required with the design of the lens module 2 or the direction of movement of the coil 31 And change. The winding pattern of the coil 31 or the electromagnet group 32 of the present invention, the current direction, the number of electromagnets of the electromagnet group 32, and the type of the spring 37 can be selected as needed. <First Embodiment> Lens shifting mechanism having four electromagnets Referring to Figs. 2 and 3, the lens shifting mechanism 3 of the present embodiment can be used for an autofocus or focus lens mode of a compact camera. In the group 1 'the lens module 1 is a square module of lOmmxlOmm, wherein the lens module 1 base comprises at least a cavity formed by the upper cover 11 and the bottom cover 12, for a lens 2 to be in the cavity The lens shaft is slidably displaced in the Z direction; the lens 2 generally includes a lens group 21 composed of a single lens or a plurality of lenses, and a lens sleeve 22 for accommodating the lens group 21, that is, the lens group 21 and The lens sleeve 22 is a lens 2 that constitutes a synchronous movement, and is sleeved in the cavity to be slidably displaced on the central axis Z by forward or backward (toward the object side or toward the image side). The lens shifting mechanism 3 of the present invention comprises: a coil 31, an electromagnet group 32, a conductive sheet 33, a coil electrode 34 and an electromagnet electrode 35; wherein the coil 31 is fixed to the lens cover of the lens 2 The cylinder 22 is synchronously moved with a lens group 21 to form a linkage body; the electromagnet group 32 is composed of a plurality of electromagnets such as an electromagnet (I) 321, an electromagnet (Π) 322, and an electromagnet ( In) 323 and electromagnet (IV) 324 and other four electromagnets are formed and remain fixed; and the camera controller (such as controller 37 in Figure 4) can output currents in different directions or different sizes (inflow or outflow) via The electromagnet electrode 35 includes an electromagnet (I) electrode 351, an electromagnetic 饊 (II) electrode 352, an electromagnet (III) electrode 353, and an electromagnet (IV) electrode 354, and is input to each electromagnet of the electromagnet group 32, respectively. As shown in FIG. 2, the electromagnet group 32 of the embodiment includes four electromagnets (I) 321 , electromagnet (Π) 322, electromagnet (III) 323, and electromagnet (IV) 324, which are 90 The degree of orientation is evenly laid and fixed to the periphery of the coil 31. When the output current (h, Ι2, ι3, 14) of the controller 37 enters the electromagnets 321 to 324 of the electromagnet group 32 via the electromagnet electrodes 35, 'electromagnetic force can be applied to the electromagnets 321 to 324. The core 36 generates a magnetic force of the N pole or the S pole. The magnitude and direction of the magnetic force are controlled by the magnitude and direction of the input current. In this embodiment, the magnetic forces of the four electromagnets 321 324 324 are equivalent, and the core of the electromagnet core 36 The poles are all toward the central axis of the lens 10 Ϊ magnetic i, in order to make the electromagnetic efficiency of the f magnet group 32 the strongest, too careful electromagnet (I) 321, electromagnet (: strong, 323 and electromagnet in this embodiment ( IV) 324 electromagnet core 36, magnet (111) material. (4) Iron ~ 36 township when the steel sheet is the controller 37 output current I through the coil lightning 33 into the coil 31, the current direction is two = 4 and the connection of the conductive In the case of the film, the coil 31 is subjected to the upward direction (object side direction) according to the right hand fixed lens sleeve 22 and the mirror group 21 along the lens center force 'to make the 3 output current 1 direction clockwise, and the coil 31 according to the Faraday right hand Turn, the line is closed in the downward direction (image side direction) The electromagnetic force, together with moving the lens sleeve 22 and the lens 21 along the center axis of the lens downward (image side direction); thus achieving the purpose of moving the lens to achieve focusing. When the controller 37 cuts off the output current I, the coil 31 no longer generates a magnetic field' coil 31 is no longer subjected to electromagnetic force, lens 2 is no longer moving; or when controller 37 cuts off output currents I!, ι2, ι3, 14, electromagnets 321, 322, 323, 324 no longer generates magnetic force, and lens 2 no longer moves. Table 1 shows the direction of current and current used in this embodiment. Table 1. This embodiment uses current direction and current magnitude. Current amperage/direction lens moves lens to object side. Moving to the image side I (coil current) 150mA Counterclockwise 150mA Clockwise I! (electromagnet current) 75mA counterclockwise 75mA counterclockwise h 75mA counterclockwise 75mA counterclockwise h 75mA counterclockwise 75mA counterclockwise u 75mA counterclockwise 75mA counterclockwise 1354177 And it is a coil spring made of elastic sauce steel and is a compression type bomb * * when the force of the lens group 21 and the upper cover u #2 circle is moved, the lens cover 22 and the lens group 21 are moved to move white. ,this When the current is pressed, the current is removed, and the upward electromagnetic force disappears. The bomb sauce = pressure and returns to the original state, and the lens 2 is pushed back to the original position. Dan again! <Second embodiment> With three electromagnets The lens shifting mechanism is shown in FIG. 6. The lens shifting mechanism 3 of the present embodiment is an autofocus or focusing lens module of a compact camera. The lens module is a round module of 8 mm x 8 mm, and includes: a coil. 31. An electromagnet, a crucible 32, a conductive sheet 33, a coil electrode 34, and an electromagnet electrode 35. The electromagnet group 32 is composed of three electromagnets, including an electromagnet, and (1) 321 , electromagnet ( II ) 322 and electromagnet ( ΠΙ ) 323 , the electromagnet is evenly arranged on the periphery of the coil 31 in a 120 degree direction and fixed, when the controller 37 outputs current (h, I2, : ^) Entering each of the electromagnets 321, 322, 323 in the electromagnet group 32 via the electromagnetic electrodes 35, and the output current I of the controller 37 enters the coil 31 via the coil electrode 34 and the connected conductive sheet %, then the coil 31 The electric tank force 'in the upward direction (object side direction) together with the lens sleeve 22 Slice group lens 21 along the central axis direction ζ (object-side direction); when the controller 37 off if the output current of the coil 31 is no longer subjected to electromagnetic force. Table 2 shows the direction of current usage and the size of the power for this embodiment. ^Example uses current direction and current is large 1 amp / direction lens moves to the object side _ lens shifts to the image side jt loop current) 150 mA counterclockwise 150 mA counterclockwise 1 magnet current) 100 mA clockwise 100 mA clockwise 100 mA clockwise 100mA clockwise 12 '1

S 1354177 I3 100mA clockwise 100mA clockwise <third embodiment> lens shifting mechanism with anti-shake function Referring to Fig. 2, the lens shifting mechanism 3 of the present invention can be applied to an autofocus or focus The lens module 1 is further configured to independently control the magnetic force of the electromagnet of the electromagnet group 32 to cause an angular offset between the optical axis of the lens 2 and the central axis Z of the lens module 1 to make the lens 2 The object can be directed to the object to achieve the anti-shake function. In this embodiment, the lens shifting mechanism 3 includes: a coil 31, an electromagnet group 32, a conductive sheet 33, a coil electrode 34, and an electromagnet electrode 35; wherein, the controller of the camera (as shown in FIG. 3) The controller 37) can output currents (inflow or outflow) of different directions or different sizes into the electromagnet group 32 via the electromagnet electrode 35. In the embodiment, the electromagnet group 32 is composed of four electromagnets, including electromagnetic Four electromagnets, such as iron (I) 321 , electromagnet (II ) 322, electromagnet (III) 323, and electromagnet (IV) 324, are uniformly arranged and fixed in a 90-degree orientation. On the periphery of the coil 31, when the controller 37 outputs current (h, 12, 13, 14) through the four sets of electromagnet electrodes 35 (electromagnet I electrode 351, electromagnet II electrode 352, electromagnet III electrode 353, electromagnet IV electrode 354) The electromagnet (I) 321 , the electromagnet (II ) 322 , the electromagnet ( III ) 323 , and the electromagnet ( IV ) 324 are generated to generate an N pole at the electromagnet core 36 of each of the electromagnets 321 to 324 by electromagnetic action. Or the magnetic force of the S pole. The magnitude and direction of this magnetic force are large by the input current. And the direction is controlled, in this embodiment, the electromagnetic forces of the four electromagnets 321 324 324 can be separately controlled, and the N poles are all toward the center of the lens, or can be separately controlled so that the S pole of the single electromagnet faces the lens. center. The electromagnet core 36 of the electromagnets 321 to 324 used in this embodiment is made of Permalloys, and the iron-nickel alloy has low magnetic permeability and high electromagnetic sensitivity, and is fast to the electromagnets 321 to 324. When the current is changed, the electromagnetic force can be quickly reacted to facilitate the independence

13 control the electromagnetic force of each electromagnet. As shown in Figure 5, the electromagnet (Ϊ) 321 and the electromagnet (冚) 323 are located at 180 degrees, as shown in Figure 5; ^ When shaking, the subject is relatively offset from the Z axis of the lens center axis, and is moved to the X axis. To compensate for this vibration amount, the controller 37 can apply different currents to the electromagnet, 321 and the electromagnet (III) 323. For example, if the electromagnetic (I) 321 is applied with a small current and the electromagnet (冚) is subjected to 3 currents; at this time, the coil 31 will be subjected to different electromagnetic forces between the electromagnet (321 and the electromagnetic right eight (III) 323. The optical axis of the unbalanced force-bearing lens 2 can be generated relative to the direction of the force--the offset angle θ makes the lens 2 face the subject' to prevent the shaking. The table uses the direction of the current and the magnitude of the current. Λ &

13 75mA counterclockwise 90mA counterclockwise

U ------ 75 mA counterclockwise - electric ^ Ϊ if * The controller 37 can apply the current in different directions to the first Γ 323, and the coil 31 is biased toward the object side (or toward the iron) The electromagnet 321 and the third electromagnetic force, the second shivering downward (toward the x-axis), causes the lens 2 to produce an angle of -0, and the lens 2 is directed toward the photographed 1354177 to achieve rapid control of the anti-shake. Table 4. The direction and current of the current are used in Table 4. Table 4. Current direction and current magnitude for fast control purposes Current direction/ Ampere lens moves to the object side and the lens optical axis forms a downward angle with the central axis 1.2 degrees I 150mA Counterclockwise I. 90 mA Counterclockwise 12 75 mA Counterclockwise L·60 mA Clockwise 14 75 mA Counterclockwise The structural design of the present invention has at least the following advantages as compared with the prior art: &lt;1 &gt;, the lens shifting mechanism 3 of the present invention An electromagnet is used instead of a permanent magnet, which is resistant to reflow high temperature and can increase the possibility of mass production. <2> The lens shifting mechanism 3 of the present invention can independently control each electromagnet in the electromagnet group 32, Make it anti-shake function The present invention is only the preferred embodiment of the present invention, and is intended to be illustrative, and not restrictive, and it is understood by those skilled in the art that Many changes, modifications, and even equivalents are intended to fall within the scope of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a lens shifting mechanism of the prior art. Figure 2 is a lens shift of the present invention. 3 is a perspective view of a lens shifting mechanism of the present invention. Fig. 4 is an explanatory view of a lens shifting mechanism of the present invention. Fig. 5 is an anti-shake of the lens shifting mechanism of the present invention. Illustrating.

15 1354177 Figure 6 is a perspective view of a second embodiment of the lens shifting mechanism of the present invention. [Main component symbol description] Lens module 1 Upper cover 11 Bottom cover 12 Lens 2 Lens group 21 Lens holder 22 Lens shift Lens driving mechanism 3 coil (conductor coil) 31 electromagnet parts 3 2 electromagnet (I ) (electromagnet 1) 321 electromagnet (II ) (electromagnet 1) 322 electromagnet (III ) (electromagnet 1 )323 Electromagnet (IV) (electromagnet IV) 324 Conductor plate 3 3 Coil pad 34 Electromagnet pad 3 5 Electromagnet I electrode (electromagnet Ipad) 351 Electromagnet II electrode (eleclxomagnet II pad) 352 Electromagnet III electrode 3 53 Electromagnet IV pad 3 54 Electromagnet ferrite 3 6 Controller 37 Spring element 38 Permanent magnet ( Permanent magnet)70 16

Claims (1)

1354177 X. Patent application scope: 1. A lens shifting mechanism, which is suitable for an autofocus or zoom lens module, the lens module includes at least a cavity, a lens and a lens shifting mechanism, wherein the lens The utility model comprises a lens group and a lens sleeve which are sleeved in the cavity and can be slidably displaced on the central axis in the direction of approaching or away from the object; wherein the lens shifting mechanism utilizes a coil and is opposite to the lens The coil is arranged in an electromagnet group outside the coil, wherein the coil is fixed on the periphery of the lens and combined with the lens to form a lens linkage that can be synchronously sliding and displaced; the electromagnet group is composed of a plurality of electromagnets And remaining in the lens module, thereby, when the coil and the electromagnet group respectively input current, the electromagnetic force generated between the coil and the electromagnet group can be used to drive the lens to slide in the direction of the central axis. . 2. The lens shifting mechanism according to claim 1, wherein each of the electromagnets of the electromagnet group is evenly disposed around the coil, and an end surface of each electromagnet core is vertically facing the lens. The central axis. 3. The lens shifting mechanism according to claim 1, wherein the lens is driven to slide in the direction of the central axis, and the forward or backward is controlled by the current direction of the input coil. 4. The lens shifting mechanism of claim 1, wherein the plurality of electromagnets further apply currents of different sizes or directions to control an angle between a lens optical axis and a central axis of the lens module. . 5. The lens shifting mechanism according to claim 1, wherein the lens is further provided with a spring on the lens, and when the electromagnetic force of the coil and the electromagnet group disappears, the spring can provide a restoring force to the lens to make the lens Revert to the original position. 6. The lens shifting mechanism of claim 5, wherein the spring is a compression spring or a tension spring. 17 (S &gt;