CN201207095Y - Lens driving device - Google Patents
Lens driving device Download PDFInfo
- Publication number
- CN201207095Y CN201207095Y CNU2008200924298U CN200820092429U CN201207095Y CN 201207095 Y CN201207095 Y CN 201207095Y CN U2008200924298 U CNU2008200924298 U CN U2008200924298U CN 200820092429 U CN200820092429 U CN 200820092429U CN 201207095 Y CN201207095 Y CN 201207095Y
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- magnet
- lens
- polarity
- coil
- driving apparatus
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Abstract
The utility model provides a lens driving device, comprising a fixed part, a moving part, and a driving part used to drive the moving part to move relatively to the fixed part. The fixed part comprises an iron shell, the moving part comprises a lens stand used to accommodate the lens, and the driving part comprises a plurality of magnets which are fixed in the iron shell. The magnets(a plurality of ) are divided into at least two layers axially along the lens and are divided into at least two groups along the circumference of the lens. Each magnet is polarized along the radial direction of the lens; at least two adjacent magnets in the same layer are opposite in polarity, thus forming a magnetic loop in the plane which is axially perpendicular to the lens; and two adjacent magnets in the same group are opposite in polarity, thus forming a loop in the plane which is axially parallel to the lens. The driving part further comprises at least two coils which are fixed on the lens stand, corresponding to the magnets(a plurality of). Since each coil is involved in a plurality of magnetic loops, the magnetic field intensity of the coils is greatly improved and magnetic flux leakage is reduced, thus improving electro magnetic interference(EMI) and increasing magnetic field utilization ratio.
Description
Technical field
The utility model belongs to the camera technique field, relates in particular to a kind of lens driving apparatus.
Background technology
Usually be equipped with camera lens in the video electronic products such as notebook computer of the mobile phone of digital camera, Digital Video, band camera function, band camera, a kind of lens driving mode commonly used is to drive camera lens by a coil and a magnet generation electromagnetic force to move on optical axial in the prior art.
Figure 1 shows that a kind of lens driving apparatus of the prior art, it comprises iron-clad 11, magnet 12, a coil 13 and a lens bracket 14, magnet 12 is fixing as fixed part with iron-clad 11, coil 13 fixed covers place lens bracket 14 outsides fixing as motion parts, and motion parts can the relatively fixed part motion.Iron-clad 11 comprises outer ring 111, inner ring 112 and yoke portion 113, link to each other by yoke portion 113 between outer ring 111, the inner ring 112, magnet 12 is fixed on 111 inboards, outer ring, coil 13 is between inner ring 112 and outer ring 111, there is air gap between coil 13 and the magnet 12, also has air gap between coil 13 and the iron-clad inner ring 112.
The flow direction of magnet 12 is shown in the direction of arrow among Fig. 1, because lens bracket 114 is motion parts, therefore, the inner ring 112 of iron-clad must be shorter than the length of outer ring 111 and magnet 12, the magnetic flux that magnet 12 produces has greatly can not enter inner ring 112, and that this part fails to enter the magnetic resistance that the magnetic flux of inner ring 112 runs into is bigger, the therefore corresponding residing magnetic field of coiler part a little less than, the magnetic field utilization factor is low.
The utility model content
In order to solve the problems of the technologies described above, the utility model provides a kind of lens driving apparatus, comprise fixed part, motion parts and be used for the drive part of actuation movement part relatively fixed part motion, described fixed part comprises iron-clad, described motion parts comprises the lens bracket that is used to accommodate camera lens, described drive part comprises that several are fixed in the magnet in the iron-clad, described several magnet axially are divided into two-layer at least along camera lens, circumferentially be divided at least two groups along camera lens, each magnet is along the camera lens radial polarised, thereby the polarity that has two adjacent magnet in each layer magnet at least on the contrary with the axially vertical plane of camera lens in form magnetic loop, the polarity of two adjacent magnet in same group is opposite, thereby with the plane of camera lens axially parallel in form magnetic loop, described drive part also comprises at least two coils that are fixed in lens bracket, corresponding described several magnet.
The bright further improvement of we is: each magnet is with opposite with the polarity of magnet in two adjacent set in the layer, one group of magnet of each coil correspondence, the current opposite in direction of the two adjacent lines circles of flowing through.
The bright further improvement of we is: described several magnet circumferentially are divided into four groups along camera lens, and described drive part comprises the respectively corresponding described four groups of magnet of four coils.
The bright further improvement of we is: described several magnet circumferentially are divided into two groups along camera lens, and described drive part comprises the respectively corresponding described two groups of magnet of two coils.
The bright further improvement of we is: described several magnet circumferentially are divided into four groups along camera lens, and the polarity of the same layer magnet in each magnet and the adjacent set wherein is opposite, and are identical with the polarity of same layer of magnet in another adjacent set.
The bright further improvement of we is: described drive part comprises two coils, two groups of identical magnet of the corresponding polarity of each coil, the current opposite in direction of two coils of flowing through.
The bright further improvement of we is: the coiling center of described coil is axially vertical with camera lens.
The bright further improvement of we is: the embowment before lens bracket of described coil stationary.
The bright further improvement of we is: described coil is fixed in the lens bracket outside by bonding method.
The beneficial effect that the utility model illustrated embodiment has is: owing to be formed with magnetic loop in one deck, in same group, also be formed with magnetic loop, each coil is arranged in a plurality of magnetic loops simultaneously, therefore the residing magnetic field intensity of coil strengthens greatly, leakage field reduces, EMI improves, and the magnetic field utilization factor increases.
Description of drawings
Fig. 1 is the cross-sectional schematic of a kind of lens driving apparatus of providing of prior art;
Fig. 2 is the STRUCTURE DECOMPOSITION synoptic diagram of the lens driving apparatus that provides of the utility model embodiment;
Fig. 3 is that iron-clad, magnet and coil position concern synoptic diagram in the lens driving apparatus that provides of the utility model embodiment;
Fig. 4 is the flow direction synoptic diagram of magnet in the lens driving apparatus that provides of the utility model embodiment;
Fig. 5 is the cross-sectional schematic along A-A line among Fig. 3 of the lens driving apparatus that provides of the utility model embodiment;
Fig. 6 is the structural representation of coil in the lens driving apparatus that provides of the utility model embodiment;
Fig. 7 is that iron-clad, magnet and coil position concern synoptic diagram in the lens driving apparatus that provides of another embodiment of the utility model;
Fig. 8 is the flow direction synoptic diagram of magnet in the lens driving apparatus that provides of another embodiment of the utility model;
Fig. 9 is the structural representation of coil in the lens driving apparatus that provides of another embodiment of the utility model;
Figure 10 is the cross-sectional schematic along B-B line among Fig. 7 of the lens driving apparatus that provides of another embodiment of the utility model.
Embodiment
In order to make technical matters to be solved of the present utility model, technical scheme and beneficial effect clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
A kind of lens driving apparatus that the utility model embodiment provides comprises fixed part, motion parts and is used for the drive part that moves in actuation movement part relatively fixed part.Described drive part comprises that several magnet are fixed in fixed part and the motion parts, and in fixed part and motion parts another of at least two coil stationary, and towards magnet.Be convenient narration, magnet is fixed in fixed part in the following examples, and coil stationary is in motion parts, should be appreciated that the position of magnet and coil concerns in the utility model to be not limited to this.
See also Fig. 2, described fixed part comprises pedestal 20, loam cake 22, and is fixed in the iron-clad 24 between pedestal 20 and the loam cake 22, and described driving part comprises several magnet 26 that are fixed in iron-clad 24 inboards.See also Fig. 3 and Fig. 4, described several magnet 26 are 8 magnet 26a ~ 26h, described magnet 26a ~ 26h axially is divided into two-layer along camera lens, circumferentially be divided into four groups along camera lens, 26a ~ 26d is positioned at the upper strata as magnet, and magnet 26e ~ 26g is positioned at lower floor, magnet 26a and magnet 26e are positioned at same group, magnet 26b and magnet 26f are positioned at same group, and magnet 26c and magnet 26g are positioned at same group, and magnet 26d and magnet 26h are positioned at same group.Described iron-clad 24 is square, and each group magnet is arranged at four angles of iron-clad 24 respectively.The position relation that should be appreciated that magnet and iron-clad in the utility model is not limited to this.Each magnet is along the camera lens radial polarised, the polarity of the same layer magnet in each magnet and the adjacent set wherein is opposite, identical with the polarity of same layer magnet in another adjacent set, the polarity of magnet that is positioned at adjacent layer in same group is opposite, opposite as magnet 26a with magnet 26b polarity, identical with magnet 26c polarity, opposite with magnet 26e polarity.
Described motion parts comprises the lens bracket 40 of accommodating camera lens, described driving part also comprises two coils 42,44 that are axially fixed at described lens bracket 40 both sides along camera lens, the corresponding two groups of polarity of each coil are provided with identical magnet, as coil 42 corresponding magnet 26a, 26e and 26c, 26g, coil 44 corresponding magnet 26b, 26f and 26d, 26h.The coiling center of coil 42,44 and camera lens axis normal, the flow through current opposite in direction of two coils 42,44, promptly from the optical center toward two coils, one for clockwise direction another is counterclockwise, shown in Fig. 3 arrow, the direction of current of flowing through coil 44 is that the direction of current of clockwise direction and flowing through coil 42 is for counterclockwise.As Fig. 5 and shown in Figure 6, each coil comprises the corresponding upper strata of the first half magnet, the corresponding lower floor of the latter half magnet, the corresponding magnet 26a of the first half 42a, 26c as coil 42, the corresponding magnet 26e of the latter half 42b, 26g, the corresponding magnet 26b of the first half 44a of coil 44,26d, the corresponding magnet 26f of the latter half 44b, 26h.
The flow direction of above-mentioned magnet 26a ~ 26h is shown in the direction of arrow among Fig. 3 and Fig. 4, in the magnet 26a ~ 26d of upper strata, the magnetic flux that magnet 26a produces sends from its N utmost point, pass the first half 42a of coil 42, the first half 44a of coil 44 successively, pass air gap then, arrive the S utmost point of the magnet 26b in the adjacent set, and return the S utmost point of magnet 26a by iron-clad 24; Equally, the magnetic flux that magnet 26c produces passes the first half 42a of coil 42, the first half 44a of coil 44 successively from the N utmost point, passes air gap, arrives the S utmost point of the magnet 26d in the adjacent set, and returns the S utmost point of magnet 26c by iron-clad 24.Be appreciated that ground, the magnetic line of force of lower floor's magnet flows to the upper strata basic identical, does not repeat them here.Like this, in each layer magnet, also promptly perpendicular in the axial plane of camera lens, polarity is provided with that two opposite adjacent magnet are common to be constituted a magnetic loop and pass two coils, the current opposite in direction of two coils owing to flow through, described two coils are subjected to force direction identical in same magnetic loop.
In same group of magnet, group with magnet 26a and magnet 26e place is that example describes below, the magnetic flux that magnet 26a produces passes the first half 42a, the latter half 42b of coil 42 successively from the N utmost point, pass air gap, arrive the S utmost point of the 26e of magnet on the same group in the lower floor, and return the S utmost point of magnet 26a by iron-clad 24.Like this, in each group magnet, also promptly be parallel in the axial plane of camera lens, polarity is provided with magnetic loop of the common formation of two opposite adjacent magnet.According to left-hand rule as can be known, the 42a of two parts up and down of coil 42,42b are subjected to force direction consistent in the magnetic loop that magnet 26a and magnet 26e form.
In the above-described embodiments, owing in one deck, be formed with magnetic loop, in same group, also be formed with magnetic loop, each coil is arranged in a plurality of magnetic loops simultaneously, so the magnetic field intensity at coil place place strengthens greatly, and leakage field reduces, EMI improves, and the magnetic field utilization factor increases.
In the above-described embodiments, described coil 42,44 is square around a coiling center coiled earlier, and embowment more afterwards (as shown in Figure 6) is fixed to the both sides of lens bracket 40 then by modes such as stickups.
Be appreciated that ground, in the above-described embodiments, in each layer magnet, the two adjacent magnet that polarity is identical can be made one, as: in the magnet of upper strata, magnet 26a and magnet 26c can make one, and magnet 26b and magnet 26d can make one; In lower floor's magnet, magnet 26e and magnet 26g can make one, and magnet 26f and magnet 26h can make one.
See also Fig. 7 to Figure 10, as another kind of embodiment of the present utility model, each magnet is with opposite with the polarity of the magnet in two adjacent set in the layer, opposite as magnet 26a ' with the polarity of magnet 26b ', 26c ', magnet 26d ' is opposite with the polarity of magnet 26b ', 26c ', 26e ' is opposite with the polarity of magnet 26f ', 26g ', and 26h ' is opposite with the polarity of magnet 26f ', 26g '; The polarity of magnet that is positioned at adjacent layer in same group is also opposite.Drive part comprises four coils 42 ', 44 ', 46 ', 48 ', the corresponding one group of magnet of each coil, the current opposite in direction of the adjacent windings of flowing through.
Among upper strata magnet 26a ' ~ 26d ', the magnetic flux that magnet 26a ' produces sends from the N utmost point, pass the first half 42a ' of one of them coil 42 ', a part enters the first half 44a ' of another coil 44 ', pass air gap, arrive the S utmost point of the magnet 26b ' in the adjacent set, and return the S utmost point of magnet 26a ' by iron-clad 24, and another part enters the first half of another coil 46 ', pass air gap, arrive the S utmost point of the magnet 26c ' in another adjacent set, and return the S utmost point of magnet 26a ' by iron-clad 24.Like this, form two magnetic loops respectively between magnet 26a ' and its two adjacent magnet 26b ', the 26c '.Be appreciated that ground, also can form two magnetic loops respectively between magnet 26d ' and its two adjacent magnet 26b ', the 26c '.In each group magnet, also promptly be parallel in the axial plane of camera lens, polarity is provided with magnetic loop of the common formation of two opposite adjacent magnet, and passes corresponding coil successively.Like this, in each layer magnet, be formed with a plurality of magnetic loops, in each group magnet, also be formed with magnetic loop along different directions, each coil is arranged in a plurality of magnetic loops simultaneously, so the magnetic field intensity at coil place place strengthens greatly, and leakage field reduces, EIM improves, and the magnetic field utilization factor increases.
Be appreciated that ground, in above-mentioned utility model embodiment, lens driving apparatus can be squarish, cylindrical or other shapes, correspondingly, iron-clad 24 can be squarish, circle or other shapes, and lens bracket 40 can be square, cylindrical or other shapes, the number of magnetic poles that is arranged in one deck magnet is not limited to above listed situation, with the number of magnetic poles in one deck magnet can be 2N, and N is the integer more than or equal to 1, as 6,8,10 etc.
In above-mentioned utility model embodiment; the above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (9)
1, a kind of lens driving apparatus, comprise fixed part, motion parts and be used for the drive part of actuation movement part relatively fixed part motion, described fixed part comprises iron-clad, described motion parts comprises the lens bracket that is used to accommodate camera lens, it is characterized in that: described drive part comprises that several are fixed in the magnet in the iron-clad, described several magnet axially are divided into two-layer at least along camera lens, circumferentially be divided at least two groups along camera lens, each magnet is along the camera lens radial polarised, thereby the polarity that has two adjacent magnet in each layer magnet at least on the contrary with the axially vertical plane of camera lens in form magnetic loop, the polarity of two adjacent magnet in same group is opposite, thereby with the plane of camera lens axially parallel in form magnetic loop, described drive part also comprises at least two coils that are fixed in lens bracket, corresponding described several magnet.
2, lens driving apparatus as claimed in claim 1 is characterized in that: each magnet is with opposite with the polarity of magnet in two adjacent set in the layer, the corresponding one group of magnet of each coil, the current opposite in direction of the two adjacent lines circles of flowing through.
3, lens driving apparatus as claimed in claim 2 is characterized in that: described several magnet circumferentially are divided into four groups along camera lens, and described drive part comprises the respectively corresponding described four groups of magnet of four coils.
4, lens driving apparatus as claimed in claim 2 is characterized in that: described several magnet circumferentially are divided into two groups along camera lens, and described drive part comprises the respectively corresponding described two groups of magnet of two coils.
5, lens driving apparatus as claimed in claim 1 is characterized in that: described several magnet circumferentially are divided into four groups along camera lens, and the polarity of the same layer magnet in each magnet and the adjacent set wherein is opposite, and are identical with the polarity of same layer magnet in another adjacent set.
6, lens driving apparatus as claimed in claim 5 is characterized in that: described drive part comprises two coils, two groups of identical magnet of the corresponding polarity of each coil, the current opposite in direction of two coils of flowing through.
7, as each described lens driving apparatus of claim 1 to 6, it is characterized in that: the coiling center of described coil is axially vertical with camera lens.
8, lens driving apparatus as claimed in claim 7 is characterized in that: the embowment before lens bracket of described coil stationary.
9, lens driving apparatus as claimed in claim 8 is characterized in that: described coil is fixed in the lens bracket outside by bonding method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200924298U CN201207095Y (en) | 2008-02-29 | 2008-02-29 | Lens driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200924298U CN201207095Y (en) | 2008-02-29 | 2008-02-29 | Lens driving device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201207095Y true CN201207095Y (en) | 2009-03-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200924298U Expired - Lifetime CN201207095Y (en) | 2008-02-29 | 2008-02-29 | Lens driving device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201207095Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101527490A (en) * | 2009-04-17 | 2009-09-09 | 惠州市百宏微动技术工业有限公司 | Superminiature voice coil motor |
-
2008
- 2008-02-29 CN CNU2008200924298U patent/CN201207095Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101527490A (en) * | 2009-04-17 | 2009-09-09 | 惠州市百宏微动技术工业有限公司 | Superminiature voice coil motor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Guangdong Dechang Motor Co.,Ltd. Assignor: Johnson Electric (Shenzhen) Co., Ltd. Contract fulfillment period: 2009.9.8 to 2014.9.7 Contract record no.: 2009440001440 Denomination of utility model: Two-section lens driver Granted publication date: 20090311 License type: Exclusive license Record date: 20090918 |
|
| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2009.9.8 TO 2014.9.7; CHANGE OF CONTRACT Name of requester: GUANGDONG DECHANG ELECTRIC MACHINE CO., LTD. Effective date: 20090918 |
|
| CX01 | Expiry of patent term |
Granted publication date: 20090311 |
|
| CX01 | Expiry of patent term |