CN201166728Y - Lens shifting mechanism - Google Patents

Abstract

A lens shift mechanism is applied to an auto-focusing or zooming lens module, which at least comprises: a cavity; the lens consists of a lens group and a lens sleeve and can slide and move in the direction of a central shaft in the containing cavity; and a lens shift element mechanism for driving the lens slide shift element; the lens shifting mechanism mainly comprises a coil and a plurality of electromagnets which are arranged around the coil relative to the coil, wherein the coil is fixedly arranged on the lens sleeve so as to be capable of moving synchronously with the lens, and the electromagnet group consists of a plurality of electromagnets and is kept fixed; when current is applied to each electromagnet, an N-pole or S-pole electromagnetic field can be generated on the end face of the electromagnet, and when current is applied to the coil, electromagnetic force can be generated to tend to move the lens sleeve along the central axis, so that the lens group moves and zooms. The utility model discloses a camera lens shift mechanism does not contain permanent magnet, makes the camera lens module can be able to bear or endure the high temperature of reflow soldering and improve the possibility of volume production.

Description

lens shift mechanism

technical field

The utility model relates to a lens shifting mechanism, which is applied to an auto-focus or zoom lens group, in particular to a lens that uses a coil and an electromagnet, and uses the electromagnetic force generated between the two to drive and control the lens. A mechanism for sliding displacement.

Background technique

Currently used digital cameras, mobile phones with shooting functions, notebook computers and other hand-held electronic devices are often equipped with a compact camera module (compact camera module, referred to as AF) that can automatically focus (auto-focusing, referred to as AF) or zooming (zooming). CCM), and the lens module basically includes: a cavity (housing) formed by an upper cover (upper cover) and a bottom cover (bottom cover); a lens (lens) which consists of a lens group (lens group) and a The lens sleeve (lens holder) can be sleeved in the cavity and can slide forward and backward in the direction of the central axis; and a lens displacement mechanism (lens displacement mechanism), or brake (actuator), which is mainly used The lens is driven to produce a displacement action on the central axis, so as to achieve the effect of automatic focusing or zooming.

The design of common lens shift mechanism is as a kind of called piezoelectric motor (piezoelectric motor), and it is to utilize piezoelectric (piezoelectric) material principle to form, as US 7,212,358, US2003/0227560, JP2006-293083, JP2006-101611 etc.; But Generally used piezoelectric materials cannot withstand the high temperature (about 260° C.) of the reflow process, or special piezoelectric materials that can withstand high temperatures are quite expensive, which is not conducive to mass production or lower manufacturing costs. Another device called a voice coil motor (VCM for short), which is formed by using a coil, a magnet, and an elastic member (such as a spring or a shrapnel), such as US 7,262,927, US7,196,978, US 7,002,879, US 6,961,090 , US 6,687,062, US20070133110, JP2005037865, JP2005258355, WO2007026830, etc., most of these existing technologies use coils and permanent magnets (permanent magnets) in combination, as shown in Figure 1, such as the inner or outer ring arrangement of the coil 31 One or several permanent magnets 70 are set to generate a magnetic field after the coil 31 is energized, and an upward or downward electromagnetic force can be formed with the magnetic field and magnetic poles established by one or several permanent magnets 70 to drive the lens to move; but The permanent magnet will demagnetize the magnet when it is reflowed at a high temperature (about 260°C). Therefore, the above-mentioned piezoelectric motor and voice coil motor in the prior art cannot be assembled by reflow method, which limits the mass production efficiency. Furthermore, there is a lens shift mechanism utilizing a shape memory alloy (shaped memory alloy, referred to as SMA), which utilizes the characteristics of heat shrinkage and cold expansion of SMA as a driving force source for a brake (actuator), such as US 6,307,678 B2, US 6,449,434B1, US2007058070, US2007047938, JP2005275270, JP2005195998, etc. However, the action of SMA heat shrinking and cooling expansion is slow, and it is impossible to easily achieve the effect of instant auto focus or zoom.

For users who require high image quality, in order to maintain excellent mobility and photo quality in low-light environments, the anti-shake function has gradually received considerable attention. In the existing technology, the anti-shake technology is mainly achieved through several methods, such as the imaging element CCD uses a mechanical support to offset the image blurring effect caused by the vibration process by compensating the movement, or if the lens is equipped with a mechanical The structure eliminates hand shake, or uses software calculation compensation, or improves the sensitivity, or uses two gyroscopes to detect the horizontal and vertical vibrations of the imaging component CCD, and uses magnetic force to perform compensation actions, such as EP1729509, US20070292119, US20070009243, JP08122840, JP11305280, JP11220651, etc.

The use of electromagnetic force as the main power source of the lens shifting mechanism is convenient and versatile. In order to prevent the magnetic force from being damaged at high temperature (about 260°C) during reflow soldering, although special materials can be used to make high-temperature resistant permanent magnets, However, the first reason is that the price is too expensive, and the second reason is that the magnetic force is weak, so it cannot be widely used; therefore, developing new technologies to solve the reflow problem of the lens shift mechanism will be urgently needed.

Contents of the invention

The main purpose of the utility model is to provide a lens shifting mechanism capable of high temperature reflow resistance and relatively low cost, and it has the function of preventing hand shake.

For this reason, the present invention provides a kind of lens shift mechanism, and it is to utilize coil (conductor coil) and the electromagnet group (electromagnet set) that is arranged around the coil relative to the coil to form, wherein the coil is fixed on the lens sleeve When the coil is forced to move, the lens sleeve and the lens group on it can move along the central axis; the electromagnet group of the lens shifting mechanism can generate an N pole or S pole electromagnetic field on the end face of the electromagnet after passing through the current, so that After the coil is energized, it is subjected to electromagnetic force, and the direction of the electromagnetic force can be determined by Ampere's right-hand law, which drives the lens to move along the central axis to achieve the purpose of zooming the lens group; or when currents in different directions are applied to the coil, the lens can be controlled to move forward. The forward or backward direction is suitable for an auto-focus or zoom lens module; the structure can withstand the high temperature of reflow and can improve mass production, so as to improve the prior art that cannot use the reflow process using permanent magnets difficulty.

The electromagnet group in the lens shifting mechanism of the present utility model is composed of a plurality of electromagnets, which has the function of anti-hand shake. By controlling the current magnitude or current direction of each electromagnet, after the coil passes through the current, it can be subjected to various The unbalanced electromagnetic force produced by the different electromagnetic forces of the electromagnet makes the optical axis of the lens form an angle with the central axis of the lens, so that the lens 2 can face the object to achieve the automatic focus or zoom effect of the anti-shake function . Here, a plurality means two or more.

The lens shift mechanism of the present utility model can further configure a spring (spring element) on the lens or its lens sleeve, so that when the electromagnetic force between the coil and the electromagnet group disappears or does not work, the spring can move the lens The sleeve provides a relative restoring force, so that the lens can return to the original balance state or original position to achieve automatic focus or zoom effect.

In summary, compared with the prior art, the structural design of the present invention has at least the following advantages:

<1>. The lens shift mechanism 3 of the present invention uses electromagnets instead of permanent magnets, which can withstand high temperatures of reflow soldering and increase the possibility of mass production.

<2>, the lens shift unit mechanism 3 of the present invention can independently control each electromagnet in the electromagnet group 32, so that it has an anti-shake function.

Description of drawings

FIG. 1 is a schematic perspective view of a prior art lens shift mechanism;

Fig. 2 is a three-dimensional schematic diagram of an embodiment of a lens shifting mechanism of the present invention;

Fig. 3 is an explanatory diagram of the lens shifting mechanism of the present invention;

Fig. 4 is a focus explanatory diagram of the lens shifting mechanism of the present invention;

Fig. 5 is an illustration of the anti-shake of the lens shifting mechanism of the present invention;

FIG. 6 is a schematic perspective view of the second embodiment of the lens shifting mechanism of the present invention.

Description of reference signs: 1-lens module; 11-upper cover; 12-bottom cover; 2-lens; 21-lens group; 22- Lens holder; 3-lens driving mechanism; 31-coil (conductor coil); 32-electromagnet parts; 321-electromagnet (I)(electromagnet I); 322-electromagnet (II) (electromagnet I); 323-electromagnet (III) (electromagnet I); 324-electromagnet (IV) (electromagnet IV); 33-conductive sheet (electricplate); 34-coil electrode (coil pad); 35-electromagnet electrode (electromagnet pad); 351-electromagnet I electrode (electromagnet I pad); 352-electromagnet II electrode (electromagnet IIpad); 353-electromagnet III electrode (electromagnet III pad); 354- Electromagnet IV electrode (electromagnet IV pad); 36-electromagnet core (electromagnet ferrite); 37-controller (controller); 38-spring (spring element); 70-permanent magnet.

Detailed ways

In order to make the utility model more definite and detailed, the preferred embodiments are listed hereby together with the accompanying drawings, and the structure and technical characteristics of the utility model are described in detail as follows:

The following disclosed embodiments of the present utility model are described for the main components of the lens shift mechanism of the present utility model, so although the disclosed embodiments of the present utility model are applied to an autofocus or zoom lens module , but as far as the lens module with auto focus or zoom function is concerned, except for the lens shift mechanism disclosed in the utility model, other structures are generally notified technologies, so generally those who are familiar with this technology in this field It is understood that the constituent elements of the autofocus or zoom lens module disclosed in the present invention are not limited to the structure of the embodiments disclosed below, that is, the constituent elements of the autofocus or zoom lens module can undergo many changes, modifications, or even For equivalent changes, for example: the shape design of the cavity formed by the upper cover and the bottom cover in the lens module is not limited, that is, the internal space design of the lens module is not limited; or the lens group and a lens sleeve The overall shape or structural form of the lens is not limited, such as the lens group can include a single lens or a lens group composed of several lenses, and the single lens or lens group can generally be arranged in a fixing piece first and then Combined with a lens sleeve to form a lens; or the individual coil turns (turn) number, coil inner diameter (or coil inner diameter cross-sectional area), coil height, electromagnet inner coil height or current in and out of the utility model coil and electromagnet group The direction and size are not limited, and can be calculated according to the Biot-Savart Law (Biot-Savart Law) and related Ampere's right-hand law calculation formulas, such as the following formulas (1) and (2)

$\stackrel{<span\; class="notranslate">\; \&Right\; Arrow;</span>}{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; \&mu;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}{\mathrm{<span\; class="notranslate">\; 4</span>}\mathrm{<span\; class="notranslate">\; \&pi;</span>}}<span\; class="notranslate">\; \&Integral;</span>\frac{\mathrm{<span\; class="notranslate">\; ID</span>}\stackrel{<span\; class="notranslate">\; \&Right\; Arrow;</span>}{\mathrm{<span\; class="notranslate">\; l</span>}}<span\; class="notranslate">\; \&times;</span>\stackrel{<span\; class="notranslate">\; \&Right\; Arrow;</span>}{\mathrm{<span\; class="notranslate">\; r</span>}}}{{\mathrm{<span\; class="notranslate">\; r</span>}}^{\mathrm{<span\; class="notranslate">\; 2</span>}}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 1</span>}<span\; class="notranslate">\; )</span>$

$\stackrel{<span\; class="notranslate">\; \&Right\; Arrow;</span>}{\mathrm{<span\; class="notranslate">\; f</span>}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; I</span>}\stackrel{<span\; class="notranslate">\; \&OverBar;</span>}{\mathrm{<span\; class="notranslate">\; l</span>}}<span\; class="notranslate">\; \&times;</span>\stackrel{<span\; class="notranslate">\; \&Right\; Arrow;</span>}{\mathrm{<span\; class="notranslate">\; B</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; 2</span>}<span\; class="notranslate">\; )</span>$

Among them, B is the magnetic flux density, μ ₀ is the vacuum permeability (permeability), I is the coil current (Amp), l is the length of the line segment, r is the distance, and F is the force. According to formula (1) and formula (2), the magnetic flux density of the electromagnet of the utility model and the force on the coil can be calculated respectively so as to match the weight of the lens to design the best driving force.

Referring to Fig. 2, shown in 3, it is the three-dimensional schematic diagram of an embodiment of the present invention, the present utility model lens shifting mechanism 3 mainly comprises a coil 31 and an electromagnet group 32, and wherein, this coil 31 is fixed on the lens The lens sleeve 22 of 2 can move synchronously by forming a moving body together with the lens group (lens group) 21; Keep it fixed; when in use, you can use the controller (not shown in Figures 2 and 3, as shown in Figure 4) such as the controller of the camera to output different directions (inflow or outflow) to the coil 31 and the electromagnet group 32 or currents of different magnitudes, and the magnetic field can be generated on the end faces of the electromagnets 321-324 of the electromagnet group 32 through electromagnetic action, and the magnitude and direction of the magnetic field are controlled by the magnitude and direction of the input current; and the coil 31 input current After receiving the electromagnetic force according to Ampere's right-hand law, the magnitude and direction of the electromagnetic force on the coil 31 can be calculated, and the coil 31 will move along the Z-axis of the lens center axis due to the force, so as to achieve the effect of autofocus or zoom. As shown in Figure 4, after the controller 37 of the camera is used to output the current, the electromagnet (I) 321 and the electromagnet (III) 323 (which can include the electromagnet (II) 322 and electromagnet (IV) 324), then the end faces of the electromagnet core 36 of the electromagnet (I) 321 and electromagnet (III) 323 can produce electromagnetic action, if the input current direction is counterclockwise, then the electromagnet core 36 is facing the lens The end face of the central axis Z will generate an N-pole electromagnetic; when the controller 37 of the camera outputs current and is connected to the coil 31 via the coil electrode 34, the coil 31 will generate a magnetic field. If the current input to the coil 31 is counterclockwise, the coil 31 will Electromagnetic force is generated. If the current input to the coil 31 is counterclockwise, the coil 31 will receive an electromagnetic force toward the object side, which will drive the lens 2 to move toward the object side.

The lens shifting mechanism 3 of the present utility model can further control the current magnitude or the current direction of each electromagnet 321～324 in the electromagnet group 32 respectively, to control the magnitude of the magnetic force (or electromagnetic intensity) produced by each electromagnet, so that the coil 31 is energized Afterwards, due to the difference in the electromagnetic force between the electromagnets (such as 321-324), the unbalanced electromagnetic force will cause the optical axis of the lens 2 to form an angle with the Z-axis of the lens center axis, so that the lens 2 can Deviate this angle to face the subject; Hereby take Fig. 5 as an example to illustrate that the electromagnet group 32 of lens shifting mechanism 3 is made up of electromagnet (I) 321 and electromagnet (III) 323, if control electromagnet Electromagnet (I) 321 and electromagnet (III) 323 of iron group 32, when making have different electric current magnitudes, the electromagnetic force of electromagnet (I) 321 and electromagnet (III) 323 is different, after coil 31 passes electric current, Due to the unbalanced electromagnetic force produced by the different electromagnetic forces of the electromagnet 321 and the electromagnet (III) 323, the optical axis of the lens 2 will form an angle with the Z axis of the lens central axis, so that the lens 2 can face the subject object, to achieve the anti-shake function.

The electromagnet core 36 of aforementioned electromagnet group 32 is to utilize soft magnetic material (ferrite) to make; This soft magnetic material has the characteristic of easy magnetization and easy demagnetization, and it is very easy to be magnetized in electromagnet group 32 energization, can be The magnetic force lines are concentrated on the end face of the electromagnet core 36, but when the electromagnet group 32 is not energized, the magnetic force of the electromagnet core 36 also disappears immediately, that is, the soft magnetic material itself has no ability to maintain magnetization; and the main component of the current soft magnetic material can be high-purity Iron (wrought iron, soft iron), steel with very low carbon content, silicon steel, iron-nickel alloy (Fe-NiAlloy or Permalloys), magnesium-zinc alloy (Mg-Zn alloy), nickel-zinc alloy (Ni-Zn alloy), Manganese-zinc alloy (Mn-Zn alloy) or metallic glass (metallic glass), etc., can withstand the high temperature of reflow soldering, and can be selected according to different purposes.

The lens shifting mechanism 3 of the present utility model can further configure a spring 38 with a resilient function on the lens 2. When the electromagnetic force between the coil 31 or the electromagnet group 32 disappears, the spring 38 can provide a spring 38 to the lens group 21. The relative restoring force is to provide a spring force opposite to the generated electromagnetic force to the lens 2, so as to return the lens group 21 to the original position before the electromagnetic force acts; Compression springs or extension springs, structural types such as coil springs or non-coil springs, number or setting positions are not limited, and can be changed according to the design requirements of the lens module 2 or the moving direction of the coil 31 .

The utility model coil 31 or the coil winding pattern of the electromagnet group 32, the current direction, the number of electromagnets of the electromagnet group 32 and the type of the spring 37 can be selected according to needs.

<First Embodiment> Lens Shift Mechanism with Four Electromagnets

Referring to Figures 2 and 3, the lens shift mechanism 3 of this embodiment can be applied to an autofocus or focusing lens module 1 of a small camera, and the lens module 1 is a square module of 10 mm * 10 mm, wherein the lens module 1 basically includes at least a cavity formed by the upper cover 11 and the bottom cover 12, for a lens 2 to slide and shift in the direction of the central axis Z in the cavity; the lens 2 generally includes a single lens or several lenses The formed lens group 21 and a lens sleeve 22 for accommodating the lens group 21, that is, the lens group 21 and the lens sleeve 22 form a synchronously movable lens 2, and are sleeved in the cavity so that On the central axis Z, slide and move forward or backward (toward the object side or towards the image side).

The lens shift mechanism 3 of the present utility model 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 a lens cover fixed on the lens 2 The cylinder 22 can move synchronously by forming a moving body together with the lens group (lens group) 21; Four electromagnets such as iron (III) 323 and electromagnet (IV) 324 constitute and keep fixed; Again the controller of camera (as the controller 37 of Fig. 4) can output the electric current of different directions or different sizes (inflow or Outflow) comprises electromagnet (I) electrode 351, electromagnet (II) electrode 352, electromagnet (III) electrode 353 and electromagnet (IV) electrode 354 via electromagnet electrode 35, input each electromagnet of electromagnet group 32 respectively , the electromagnet group 32 of the present embodiment comprises four electromagnets such as electromagnet (I) 321, electromagnet (II) 322, electromagnet (III) 323 and electromagnet (IV) 324 as shown in Figure 2, is to The 90-degree orientation is uniformly arranged and fixed on the periphery of the coil 31 . When the output current (I ₁ , I ₂ , I ₃ , I ₄ ) of the controller 37 enters the electromagnets 321-324 of the electromagnet group 32 via the electromagnet electrodes 35, through the electromagnetic action, each electromagnet 321-324 can The electromagnet core 36 of 324 produces the magnetic field of N pole or S pole, and the size and direction of this magnetic field are then controlled by the magnitude and direction of the electric current of input, and the magnetic field of these four electromagnets 321～324 is equivalent in the present embodiment, and electromagnet core The N poles of 36 are all facing the central axis Z of the lens. Furthermore, in order to make the electromagnetic efficiency of the electromagnet group 32 the strongest, the electromagnet core 36 of the electromagnet (I) 321, electromagnet (II) 322, electromagnet (III) 323 and electromagnet (IV) 324 of the present embodiment Choose to use silicon steel sheets as the material.

When the output current I of the controller 37 enters the coil 31 through the coil electrode 34 and the connected conductive sheet 33, the direction of the current is counterclockwise. According to the right-hand law, the coil 31 is subjected to an electromagnetic force in the upward direction (object side direction), together with the lens Sleeve 22 and lens group 21 move upward (object side direction) along lens central axis Z; The electromagnetic force along the image side direction) together with the lens barrel 22 and the lens group 21 move downward (image side direction) along the lens central axis Z; in this way, the purpose of moving the lens and achieving focus can be achieved.

When the controller 37 cuts off the output current I, the coil 31 will no longer generate a magnetic field, the coil 31 will no longer be affected by the electromagnetic force, and the lens 2 will no longer move; or when the controller 37 cuts off the output currents I ₁ , I ₂ , and I ₃ , I ₄ , the electromagnets 321, 322, 323, 324 no longer generate a magnetic field, and the lens 2 no longer moves. Table 1 shows the direction and magnitude of the current used in this embodiment.

Table 1. The direction and magnitude of the current used in this embodiment

Current Amps/Direction The lens moves to the object side The lens moves to the image side I (coil current) 150mA counterclockwise 150mA clockwise I ₁ (Solenoid current) 75mA counterclockwise 75mA counterclockwise I ₂ 75mA counterclockwise 75mA counterclockwise I ₃ 75mA counterclockwise 75mA counterclockwise

I ₄ 75mA counterclockwise 75mA counterclockwise

The spring 38 used in this embodiment is a coil spring made of spring steel and is a compression spring, which is arranged between the lens group 21 and the upper cover 11. When the coil 31 is passed through an electric current, it is moved by upward force. , will drive the lens sleeve 22 and the lens group 21 to move upward, and at this time, the compression spring 38 will be deformed; when the coil 31 cuts off the current, the upward electromagnetic force will disappear, and the spring 38 will no longer be compressed and return to its original shape, pushing the lens 2 back in situ.

<Second Embodiment> Lens Shift Mechanism with Three Electromagnets

Referring to Fig. 6, the lens shifting mechanism 3 of the present embodiment is applied in an autofocus or focus lens module 1 of a small camera, and the lens module 1 is a circular module of 8 mm * 8 mm, comprising: a coil 31, An electromagnet group 32, a conductive sheet 33, a coil electrode 34, an electromagnet electrode 35; wherein, the electromagnet group 32 is made of three electromagnets, including electromagnet (I) 321, electromagnet (II) 322 and electromagnet (III) 323, the three electromagnets are evenly arranged on the periphery of the coil 31 at 120 degrees and fixed, when the controller 37 outputs current (I ₁ , I ₂ , I ₃ ) through each electromagnet When the electrode 35 enters each electromagnet 321, 322, 323 in the electromagnet group 32, and the output current I of the controller 37 enters the coil 31 through the coil electrode 34 and the connected conductive sheet 33, the coil 31 is subjected to an upward direction (object side) direction) together with the lens sleeve 22 and the lens group 21 move upward (object side direction) along the lens central axis Z; if the controller 37 cuts off the output current, the coil 31 is no longer subjected to electromagnetic force. Table 2 shows the direction and magnitude of the current used in this embodiment.

Table two, the direction and current size of current used in this embodiment

Current Amps/Direction The lens moves to the object side The lens moves to the image side I (coil current) 150mA counterclockwise 150mA counterclockwise I ₁ (Solenoid current) 100mA Clockwise 100mA Clockwise I ₂ 100mA clockwise 100mA clockwise I ₃ 100mA Clockwise 100mA clockwise

<Third Embodiment> Lens Shift Mechanism with Anti-Shake Function

Referring to Fig. 2, the lens shifting mechanism 3 of the present utility model can be applied in an autofocus or focusing lens module 1, and can be further designed to independently control the magnetic force of the electromagnet of the electromagnet group 32, so that the lens An angular offset is generated between the optical axis of the lens module 2 and the central axis Z of the lens module 1, so that the lens 2 can face the subject (object), so as to achieve the anti-shake function. In the present embodiment, lens shift mechanism 3 comprises: a coil 31, an electromagnet group 32, a conductive sheet 33, a coil electrode 34, an electromagnet electrode 35; Wherein, the controller of camera (as shown in Figure 3 The controller 37) can output currents (inflow or outflow) in different directions or different sizes through the electromagnet electrode 35 and input the electromagnet group 32. In this 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, etc., these four electromagnets 321～324 are evenly arranged and fixed on the Around the coil 31, when the controller 37 outputs current (I ₁ , I ₂ , I ₃ , I ₄ ) via four sets of electromagnet electrodes 35 (electromagnet I electrode 351, electromagnet II electrode 352, electromagnet III electrode 353, electromagnet Iron IV electrode 354) enters electromagnet (I) 321, electromagnet (II) 322, electromagnet (III) 323 and electromagnet (IV) 324, by electromagnetic action, can be in the electromagnet core 36 of each electromagnet 321～324 Generate N-pole or S-pole magnetic field, the size and direction of this magnetic field are controlled by the magnitude and direction of the input current, the electromagnetic force of the four electromagnets 321-324 in this embodiment can be controlled separately, can be N-pole uniform To face the center of the lens, it is also possible to separately control the S pole of a single electromagnet towards the center of the lens. The electromagnet cores 36 of the electromagnets 321-324 used in this embodiment are made of iron-nickel alloy (Permalloys). The iron-nickel alloy has low magnetic permeability and high electromagnetic sensitivity. When the electric current is changed, the electromagnetic force can be quickly responded to facilitate the independent control of the electromagnetic force of each electromagnet.

As shown in Figure 5, the electromagnet (I) 321 and the electromagnet (III) 323 are located at 180 degrees relative to each other, as shown in Figure 5; when the user shakes the camera upward, the subject is relatively deviated from the lens center axis Z axis , to move to the X-axis direction, in order to make up for this amount of vibration, at this time, the controller 37 can apply different currents to the electromagnet (I) 321 and the electromagnet (III) 323, such as applying a smaller current to the electromagnet (I) 321 current, apply a large current to the electromagnet (III) 323; at this time, the coil 31 will be subjected to the different electromagnetic forces between the electromagnet (I) 321 and the electromagnet (III) 323 to cause an unbalanced force, so that the lens The optical axis of the lens 2 can be shifted by an angle θ with respect to the direction of the force, so that the lens 2 faces the subject, so as to achieve the purpose of anti-shake. Table 3 shows the direction and magnitude of the current used in this embodiment.

Table three, the direction and current size of the current used in this embodiment

Current direction/ampere The lens moves to the object side and the optical axis of the lens forms a downward angle of 1.2 degrees with the central axis I (coil current) 150mA counterclockwise I ₁ (Solenoid current) 60mA counterclockwise I ₂ 75mA counterclockwise

I ₃ 90mA counterclockwise I ₄ 75mA counterclockwise

Furthermore, for faster control, the controller 37 can apply currents in different directions to the electromagnet (I) 321 and the electromagnet (III) 323, and the electromagnet (I) 321 applies counterclockwise current, The electromagnet (III) 323 applies a clockwise current; at this time, the coil 31 is also subjected to electromagnetic forces in different directions from the electromagnet 321 and the electromagnet (III) 323 in addition to the electromagnetic force towards the object side (or towards the image side), An unbalanced force is generated, so that the optical axis of the lens 2 forms an angle θ in the direction of the force, so that the lens 2 faces the subject, so as to achieve the purpose of fast control of anti-shake. Table 4 shows the direction and magnitude of the current used.

Table 4. Current direction and current magnitude for fast control purposes

Current direction/ampere The lens moves to the object side and the optical axis of the lens forms a downward angle of 1.2 degrees with the central axis I 150mA counterclockwise I ₁ 90mA counterclockwise I ₂ 75mA counterclockwise I ₃ 60mA Clockwise I ₄ 75mA counterclockwise

Compared with the prior art, the structural design of the utility model has at least the following advantages:

<1>. The lens shift mechanism 3 of the present invention uses electromagnets instead of permanent magnets, which can withstand high temperature reflow and increase the possibility of mass production.

<2>, the lens shift mechanism 3 of the present utility model can independently control each electromagnet in the electromagnet group 32, so that it has the anti-shake function.

The above description is only a preferred embodiment of the present invention, which is only illustrative and non-restrictive for the present invention; those skilled in the art understand that it can be used within the spirit and scope defined by the claims of the present invention. Many changes, modifications, and even equivalent changes are made, but all will fall within the protection scope of the present invention.

Claims (6)

1. lens shift mechanism, it is to be applicable to that one focuses or zoom lens module automatically, this camera lens module comprises a cavity volume, a camera lens and a lens shift mechanism at least, wherein this camera lens be comprise an eyeglass group and a lens sleeve and be set in the cavity volume and can be on central shaft towards near or away from the direction transitional slide of thing; It is characterized in that: this lens shift mechanism comprises a coil and with respect to an electromagnet group of coil arrangement foreign side around the coil, and wherein this coil is to be installed in the periphery of camera lens and to be combined into the camera lens interlock body of transitional slide synchronously with camera lens; This electromagnet group is to be constituted and be maintained fixed motionless in camera lens module by a plurality of electromagnet, behind coil and electromagnet group difference input current, but the electromagnetic force that is produced between mat coil and the electromagnet group is to drive camera lens in the enterprising line slip displacement of central axis direction.

2. lens shift mechanism according to claim 1 is characterized in that, each electromagnet equal angles of this electromagnet group evenly is laid in around the coil, and an end face of the electromagnetic core of each electromagnet is that vertical plane is to the optical center axle.

3. lens shift mechanism according to claim 1 is characterized in that, this camera lens is driven advancing of transitional slide or retreats on central axis direction be that direction of current by input coil is controlled.

4. lens shift mechanism according to claim 1 is characterized in that, wherein these a plurality of electromagnet are subjected to the electric current of different sizes or direction, uses the angle between the central shaft of controls lens optical axis and camera lens module.

5. lens shift mechanism according to claim 1 is characterized in that, it is configuration one spring on camera lens further, and when coil and the disappearance of electromagnet group electromagnetic force, this spring provides restoring force so that camera lens returns back to original position to camera lens.

6. lens shift mechanism according to claim 5 is characterized in that, this spring is compression spring or the formula of extension spring.

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