TWI448800B

TWI448800B - Voice coil motor and camera module

Info

Publication number: TWI448800B
Application number: TW098144015A
Authority: TW
Inventors: Tai Hsu Chou
Original assignee: Hon Hai Prec Ind Co Ltd
Priority date: 2009-12-21
Filing date: 2009-12-21
Publication date: 2014-08-11
Also published as: TW201122701A

Description

音圈馬達及相機模組Voice coil motor and camera module

本發明涉及一種音圈馬達以及採用該音圈馬達之相機模組。The invention relates to a voice coil motor and a camera module using the voice coil motor.

音圈馬達具有體積小、耗電量少及價格低廉等優點，適合作為電子產品，如數位相機、行動電話、數位攝像機等之致動器。音圈馬達主要包括繞設有線圈之線圈座以及磁鐵，線圈可導通電流，以與磁鐵產生磁感應，使該線圈座可相對磁鐵移動，從而改變鏡筒或對焦鏡片組或變焦鏡片組與影像感測器間之距離，進而實現對焦或變焦功能。然，當線圈座與磁鐵相對移動時，會因磨擦而產生灰塵，該等灰塵易進入音圈馬達底部，進而掉落至影像感測器上，從而降低影像感測器之成像品質。The voice coil motor has the advantages of small size, low power consumption, and low price, and is suitable as an actuator for electronic products such as digital cameras, mobile phones, and digital cameras. The voice coil motor mainly comprises a coil holder around which a coil is arranged and a magnet, and the coil can conduct current to generate magnetic induction with the magnet, so that the coil holder can move relative to the magnet, thereby changing the lens barrel or the focus lens group or the zoom lens group and the image sense. The distance between the detectors to achieve focus or zoom. However, when the coil holder and the magnet move relative to each other, dust is generated by the friction, and the dust easily enters the bottom of the voice coil motor and falls onto the image sensor, thereby reducing the image quality of the image sensor.

鑒於上述狀況，有必要提供一種具有集塵功能之音圈馬達，以及採用該音圈馬達之相機模組，該音圈馬達可阻止灰塵掉落至影像感測器上，從而提高相機模組之成像品質。In view of the above situation, it is necessary to provide a voice coil motor having a dust collecting function, and a camera module using the voice coil motor, which can prevent dust from falling onto the image sensor, thereby improving the camera module. Imaging quality.

一種音圈馬達，包括具有一收容空間之殼體、繞設有線圈之線圈座、磁鐵及支承座。線圈可導通電流，以與磁鐵產生磁感應，使該線圈座可相對該磁鐵移動。支承座與殼體配合將線圈座及磁鐵收容於該收容空間內。該支承座中部開設一透光孔。該支承座鄰近該線圈座之端面設有環繞該透光孔之集塵區，該集塵區塗有黏結劑。A voice coil motor includes a housing having a receiving space, a coil holder around which a coil is disposed, a magnet, and a support base. The coil can conduct current to cause magnetic induction with the magnet to move the coil holder relative to the magnet. The support base cooperates with the housing to house the coil base and the magnet in the receiving space. A light transmission hole is defined in a middle portion of the support seat. The support seat is adjacent to the end surface of the coil base and is provided with a dust collecting area surrounding the light transmission hole, and the dust collecting area is coated with a binder.

一種相機模組，包括透鏡、用於承載透鏡之承載座、驅動該承載座之音圈馬達以及影像感測器。該音圈馬達包括具有一收容空間之殼體、繞設線圈之線圈座、磁鐵及支承座，該線圈可導通電流，以與磁鐵產生磁感應，使該線圈座可相對該磁鐵移動。該支承座與該殼體配合將該線圈座及磁鐵收容於該收容空間內。該支承座中部開設一透光孔，從透鏡入射之光線經該透光孔投射至該影像感測器。該支承座鄰近該線圈座之端面設有環繞該透光孔之集塵區，該集塵區塗有黏結劑。A camera module includes a lens, a carrier for carrying the lens, a voice coil motor for driving the carrier, and an image sensor. The voice coil motor includes a housing having a receiving space, a coil holder around which the coil is wound, a magnet, and a support seat. The coil can conduct a current to generate magnetic induction with the magnet to move the coil holder relative to the magnet. The support base cooperates with the housing to house the coil base and the magnet in the receiving space. A light transmission hole is defined in a middle portion of the support seat, and light incident from the lens is projected to the image sensor through the light transmission hole. The support seat is adjacent to the end surface of the coil base and is provided with a dust collecting area surrounding the light transmission hole, and the dust collecting area is coated with a binder.

上述音圈馬達之支承座設有集塵區，該集塵區塗有黏結劑，灰塵掉落至集塵區後將被黏結劑黏住，後續使用時，這些灰塵不會再次被揚起，從而可避免灰塵掉落至相機模組之影像感測器上，提高成像品質。The support seat of the voice coil motor is provided with a dust collecting area, and the dust collecting area is coated with a bonding agent. When the dust falls to the dust collecting area, the adhesive will be adhered by the bonding agent, and the dust will not be lifted again after the subsequent use. Therefore, dust can be prevented from falling onto the image sensor of the camera module, thereby improving the image quality.

以下結合附圖及具體實施方式對本發明之音圈馬達以及採用該音圈馬達之相機模組作進一步詳細說明。The voice coil motor of the present invention and the camera module using the voice coil motor will be further described in detail below with reference to the accompanying drawings and specific embodiments.

請參閱圖1，本發明實施方式之相機模組20包括透鏡21、用於承載透鏡21之承載座22、驅動承載座22之音圈馬達10以及影像感測器23。音圈馬達10用於驅動透鏡21移動以實現相機模組20之對焦或變焦功能。Referring to FIG. 1 , a camera module 20 according to an embodiment of the present invention includes a lens 21 , a carrier 22 for carrying the lens 21 , a voice coil motor 10 for driving the carrier 22 , and an image sensor 23 . The voice coil motor 10 is used to drive the lens 21 to move to achieve the focus or zoom function of the camera module 20.

請同時參閱圖2及圖3，音圈馬達10包括殼體11、線圈座12、磁鐵13、支承座14、第一彈片15a及第二彈片15b。2 and FIG. 3, the voice coil motor 10 includes a housing 11, a coil base 12, a magnet 13, a support base 14, a first elastic piece 15a, and a second elastic piece 15b.

殼體11用於消除外部電磁對該音圈馬達10之干擾，並防止音圈馬達10之電磁影響其外部電子元件工作。殼體11具有一底壁112以及垂直於底壁112之四側壁113。底壁112與側壁113共同圍成一收容空間115。收容空間115具有一中心軸線a。底壁112中部開設有一通孔114，光線可經通孔114入射至透鏡21。通孔114之軸線與中心軸線a重合。The housing 11 serves to eliminate external electromagnetic interference with the voice coil motor 10 and to prevent the electromagnetic of the voice coil motor 10 from affecting the operation of its external electronic components. The housing 11 has a bottom wall 112 and four side walls 113 that are perpendicular to the bottom wall 112. The bottom wall 112 and the side wall 113 together define a receiving space 115. The receiving space 115 has a central axis a. A through hole 114 is defined in the middle of the bottom wall 112, and light can be incident on the lens 21 through the through hole 114. The axis of the through hole 114 coincides with the central axis a.

線圈座12之外週面繞設有線圈121，線圈121纏繞之軸線方向與中心軸線a重合。本實施方式中，線圈座12為方形結構，其中部開設一呈圓柱形之容置腔122，透鏡21收容於容置腔122內。A coil 121 is wound around the outer circumference of the coil holder 12, and the axial direction in which the coil 121 is wound coincides with the central axis a. In this embodiment, the coil holder 12 has a square structure, and a cylindrical receiving cavity 122 is defined in the middle portion thereof, and the lens 21 is received in the accommodating cavity 122.

磁鐵13之南北磁極連線方向與線圈121纏繞之軸線方向基本垂直，線圈121可導通電流，以與磁鐵13產生磁感應，藉此線圈座12可相對磁鐵13沿中心軸線a方向移動。The north-south magnetic pole connection direction of the magnet 13 is substantially perpendicular to the axial direction in which the coil 121 is wound, and the coil 121 can conduct a current to generate magnetic induction with the magnet 13, whereby the coil base 12 can move in the direction of the central axis a with respect to the magnet 13.

本實施方式中，磁鐵13包括第一磁鐵131與第二磁鐵132。第一磁鐵131和第二磁鐵132沿中心軸線a方向排列且間隔設置。第一磁鐵131固定設置於線圈座12上方，第二磁鐵132固定於線圈座12下方，從而使得線圈座12夾設於第一磁鐵131和第二磁鐵132間。第一磁鐵131和第二磁鐵132沿中心軸線a方向具有適當之距離，以使線圈座12可沿中心軸線a上下運動，並實現相機模組20之對焦或變焦功能。In the present embodiment, the magnet 13 includes a first magnet 131 and a second magnet 132. The first magnet 131 and the second magnet 132 are arranged in the direction of the central axis a and spaced apart. The first magnet 131 is fixedly disposed above the coil base 12, and the second magnet 132 is fixed under the coil base 12 such that the coil base 12 is interposed between the first magnet 131 and the second magnet 132. The first magnet 131 and the second magnet 132 have an appropriate distance in the direction of the central axis a to allow the coil holder 12 to move up and down along the central axis a and to achieve the focusing or zooming function of the camera module 20.

第一磁鐵131和第二磁鐵132各包括二對磁條，每對磁條包括同性磁極相對之二磁條。於垂直於中心軸a之平面內，第一磁鐵131和第二磁鐵132之二對磁條均呈環形排列。第一磁鐵131、第二磁鐵132分別設置於線圈座12之上方與下方，可使音圈馬達10之空間得到有效利用，縮減產品尺寸。The first magnet 131 and the second magnet 132 each include two pairs of magnetic strips, and each pair of magnetic strips includes two magnetic strips opposite to each other. In a plane perpendicular to the central axis a, the two pairs of magnetic strips of the first magnet 131 and the second magnet 132 are arranged in a ring shape. The first magnet 131 and the second magnet 132 are respectively disposed above and below the coil holder 12, so that the space of the voice coil motor 10 can be effectively utilized to reduce the size of the product.

第一彈片15a包括設於其中部之通孔151a、固定部152a和圍繞通孔151a之形變部153a。形變部153a可於沿中心軸a方向之外力下產生彈性變形。通孔151a供光線入射到透鏡21。The first elastic piece 15a includes a through hole 151a provided at a middle portion thereof, a fixing portion 152a, and a deformation portion 153a surrounding the through hole 151a. The deformation portion 153a is elastically deformable under an external force in the direction of the central axis a. The through hole 151a supplies light to the lens 21.

本實施方式中，第一彈片15a和第二彈片15b之結構、形狀均相同。第二彈片15b包括通孔151b、固定部152b和圍繞通孔151b之形變部153b。通孔151b供光線經透鏡21後入射至影像感測器23。In the present embodiment, the structure and shape of the first elastic piece 15a and the second elastic piece 15b are the same. The second elastic piece 15b includes a through hole 151b, a fixing portion 152b, and a deformation portion 153b surrounding the through hole 151b. The through hole 151b supplies light to the image sensor 23 through the lens 21.

第一彈片15a之固定部152a與第一磁鐵131固定連接，形變部153a與線圈座12之頂部固定連接。第二彈片15b之固定部152b與第二磁鐵132固定連接，形變部153b與線圈座12之底部固定連接，從而使線圈座12懸置於殼體11內。The fixing portion 152a of the first elastic piece 15a is fixedly coupled to the first magnet 131, and the deformation portion 153a is fixedly coupled to the top of the coil holder 12. The fixing portion 152b of the second elastic piece 15b is fixedly coupled to the second magnet 132, and the deformation portion 153b is fixedly coupled to the bottom of the coil base 12, so that the coil holder 12 is suspended in the casing 11.

可以理解，亦可僅設置一彈片，如第一彈片15a或者第二彈片15b；第一彈片15a和第二彈片15b之結構和形狀亦可不同。It can be understood that only one elastic piece, such as the first elastic piece 15a or the second elastic piece 15b, may be provided; the structure and shape of the first elastic piece 15a and the second elastic piece 15b may also be different.

請同時參見圖4，支承座14設置於殼體11底部，其外形與殼體11之內週面相適配。本實施方式中，支承座14呈矩形塊狀。支承座14設置於殼體11內並與殼體11相配合將線圈座12及磁鐵13收容於收容空間115內。支承座14中部開設一透光孔141。從透鏡21出射之光線可依次通過通孔151b及透光孔141入射至影像感測器23。Referring to FIG. 4 at the same time, the support base 14 is disposed at the bottom of the casing 11, and its outer shape is matched with the inner circumferential surface of the casing 11. In the present embodiment, the support base 14 has a rectangular block shape. The support base 14 is disposed in the casing 11 and cooperates with the casing 11 to house the coil base 12 and the magnet 13 in the accommodating space 115. A light transmission hole 141 is defined in the middle of the support base 14. The light emitted from the lens 21 can be incident on the image sensor 23 through the through hole 151b and the light transmission hole 141 in order.

支承座14鄰近線圈座12之端面142設有環繞透光孔141之集塵區143，集塵區143塗有黏結劑146。集塵區143設置於線圈座12下方，線圈座12相對磁鐵13沿中心軸線a方向移動時，所產生之灰塵掉落至集塵區143時，將被黏結劑146黏住，從而阻止灰塵掉落至影像感測器23上，提高相機模組20之成像品質。The end surface 142 of the support base 14 adjacent to the coil base 12 is provided with a dust collecting area 143 surrounding the light transmission hole 141, and the dust collecting area 143 is coated with a binder 146. The dust collecting area 143 is disposed under the coil base 12, and when the coil base 12 moves in the direction of the central axis a with respect to the magnet 13, the generated dust is dropped by the bonding agent 146 when it is dropped to the dust collecting area 143, thereby preventing dust from falling. Falling onto the image sensor 23 improves the image quality of the camera module 20.

更進一步，集塵區143之內側邊緣還形成有朝靠近線圈座12方向延伸之擋塵壁144。擋塵壁144可進一步阻止灰塵從透光孔141掉落至影像感測器23。Further, the inner edge of the dust collecting area 143 is further formed with a dustproof wall 144 extending toward the coil holder 12. The dust shield wall 144 can further prevent dust from falling from the light transmission hole 141 to the image sensor 23.

本實施方式中，集塵區143為開設於端面142之環形凹槽，並包容線圈座12外週緣於垂直於中心軸線a之平面內之投影。黏結劑146佈滿集塵區143，即環形凹槽之底面。擋塵壁144為形成於透光孔141週緣之環形壁。黏結劑146優選為環氧樹脂。作為一較佳方案，黏結劑146固化於集塵區143，從而可更為有效地黏著灰塵。In the present embodiment, the dust collecting area 143 is an annular groove formed in the end surface 142 and accommodates the projection of the outer circumference of the coil base 12 in a plane perpendicular to the central axis a. The bonding agent 146 is covered with the dust collecting area 143, that is, the bottom surface of the annular groove. The dust shield wall 144 is an annular wall formed on the periphery of the light transmission hole 141. The binder 146 is preferably an epoxy resin. As a preferred solution, the binder 146 is cured in the dust collecting area 143, so that dust can be adhered more effectively.

綜上所述，本發明確已符合發明專利之要件，遂依法提出專利申請。惟，以上所述者僅為本發明之較佳實施方式，自不能以此限制本案之申請專利範圍。舉凡熟悉本案技藝之人士援依本發明之精神所作之等效修飾或變化，皆應涵蓋於以下申請專利範圍內。In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and it is not possible to limit the scope of the patent application of the present invention. Equivalent modifications or variations made by persons skilled in the art in light of the spirit of the invention are intended to be included within the scope of the following claims.

20‧‧‧相機模組20‧‧‧ camera module

21‧‧‧透鏡21‧‧‧ lens

22‧‧‧承載座22‧‧‧Hosting

23‧‧‧影像感測器23‧‧‧Image sensor

10‧‧‧音圈馬達10‧‧‧ voice coil motor

11‧‧‧殼體11‧‧‧Shell

112‧‧‧底壁112‧‧‧ bottom wall

113‧‧‧側壁113‧‧‧ side wall

115‧‧‧收容空間115‧‧‧ accommodating space

12‧‧‧線圈座12‧‧‧ coil holder

121‧‧‧線圈121‧‧‧ coil

122‧‧‧容置腔122‧‧‧容容

13‧‧‧磁鐵13‧‧‧ magnet

131‧‧‧第一磁鐵131‧‧‧First magnet

132‧‧‧第二磁鐵132‧‧‧second magnet

14‧‧‧支承座14‧‧‧ support

141‧‧‧透光孔141‧‧‧Light hole

142‧‧‧端面142‧‧‧ end face

143‧‧‧集塵區143‧‧‧dust collection area

144‧‧‧擋塵壁144‧‧‧ dust wall

146‧‧‧黏結劑146‧‧‧Adhesive

15a‧‧‧第一彈片15a‧‧‧First shrapnel

15b‧‧‧第二彈片15b‧‧‧Second shrapnel

152a、152b‧‧‧固定部152a, 152b‧‧‧ fixed department

153a、153b‧‧‧形變部153a, 153b‧‧‧Deformation Department

114、151a、151b‧‧‧通孔114, 151a, 151b‧‧‧ through holes

圖1係本發明實施方式之相機模組立體圖。1 is a perspective view of a camera module according to an embodiment of the present invention.

圖2係本發明實施方式之音圈馬達之立體組裝圖。2 is a perspective assembled view of a voice coil motor according to an embodiment of the present invention.

圖3係沿圖2之III-III線之剖面示意圖。Figure 3 is a schematic cross-sectional view taken along line III-III of Figure 2.

圖4係圖2所示音圈馬達之支承座之立體圖。Figure 4 is a perspective view of the support of the voice coil motor shown in Figure 2.

20‧‧‧相機模組 20‧‧‧ camera module

21‧‧‧透鏡 21‧‧‧ lens

22‧‧‧承載座 22‧‧‧Hosting

23‧‧‧影像感測器 23‧‧‧Image sensor

10‧‧‧音圈馬達 10‧‧‧ voice coil motor

11‧‧‧殼體 11‧‧‧Shell

112‧‧‧底壁 112‧‧‧ bottom wall

113‧‧‧側壁 113‧‧‧ side wall

115‧‧‧收容空間 115‧‧‧ accommodating space

12‧‧‧線圈座 12‧‧‧ coil holder

121‧‧‧線圈 121‧‧‧ coil

122‧‧‧容置腔 122‧‧‧容容

13‧‧‧磁鐵 13‧‧‧ magnet

131‧‧‧第一磁鐵 131‧‧‧First magnet

132‧‧‧第二磁鐵 132‧‧‧second magnet

14‧‧‧支承座 14‧‧‧ support

141‧‧‧透光孔 141‧‧‧Light hole

142‧‧‧端面 142‧‧‧ end face

143‧‧‧集塵區 143‧‧‧dust collection area

15a‧‧‧第一彈片 15a‧‧‧First shrapnel

15b‧‧‧第二彈片 15b‧‧‧Second shrapnel

152a、152b‧‧‧固定部 152a, 152b‧‧‧ fixed department

153a、153b‧‧‧形變部 153a, 153b‧‧‧Deformation Department

114、151a、151b‧‧‧通孔 114, 151a, 151b‧‧‧ through holes

Claims

一種音圈馬達，包括具有一收容空間之殼體、繞設有線圈之線圈座、磁鐵及支承座，該線圈可導通電流，以與磁鐵產生磁感應，使該線圈座可相對該磁鐵移動，該支承座與該殼體配合將該線圈座及磁鐵收容於該收容空間內，該支承座中部開設一透光孔，其改良在於：該支承座鄰近該線圈座之端面設有環繞該透光孔之集塵區，該集塵區塗有黏結劑。A voice coil motor includes a housing having a receiving space, a coil holder around which a coil is disposed, a magnet and a bearing seat, the coil being capable of conducting current to generate magnetic induction with the magnet to move the coil holder relative to the magnet, The support base cooperates with the housing to receive the coil base and the magnet in the receiving space, and a light-transmitting hole is defined in the middle of the support seat, and the improvement is that the support seat is adjacent to the light-emitting hole of the end surface of the coil base. In the dust collecting area, the dust collecting area is coated with a binder.

如申請專利範圍第1項所述之音圈馬達，其中該集塵區之內側邊緣形成有朝靠近該線圈座方向延伸之擋塵壁。The voice coil motor of claim 1, wherein an inner edge of the dust collecting portion is formed with a dustproof wall extending toward the coil holder.

如申請專利範圍第1或2項所述之音圈馬達，其中該集塵區為開設於該端面之環形凹槽。The voice coil motor of claim 1 or 2, wherein the dust collecting area is an annular groove formed in the end surface.

如申請專利範圍第1或2項所述之音圈馬達，其中該黏結劑固化於該集塵區。The voice coil motor of claim 1 or 2, wherein the binder is solidified in the dust collecting zone.

如申請專利範圍第4項所述之音圈馬達，其中該黏結劑為環氧樹脂。The voice coil motor of claim 4, wherein the binder is an epoxy resin.

如申請專利範圍第1項所述之音圈馬達，其中該收容空間具有一中心軸線，該磁鐵包括沿該中心軸線方向排列之第一磁鐵和第二磁鐵，該線圈座夾設於該第一磁鐵和第二磁鐵間。The voice coil motor of claim 1, wherein the receiving space has a central axis, the magnet includes a first magnet and a second magnet arranged along the central axis, the coil holder being clamped to the first Between the magnet and the second magnet.

如申請專利範圍第6項所述之音圈馬達，其中該音圈馬達進一步包括二彈片，每一彈片包括固定部和形變部，該二彈片之固定部分別與該線圈座之相對二端固定連接，該二彈片之形變部分別與第一磁鐵及第二磁鐵固定連接。The voice coil motor of claim 6, wherein the voice coil motor further comprises two elastic pieces, each of the elastic pieces comprising a fixing portion and a deformation portion, wherein the fixing portions of the two elastic pieces are respectively fixed to opposite ends of the coil holder The connecting portions of the two elastic pieces are fixedly connected to the first magnet and the second magnet, respectively.

一種相機模組，其包括透鏡、用於承載透鏡之承載座、驅動該承載座之音圈馬達以及影像感測器，該音圈馬達包括具有一收容空間之殼體、繞設有線圈之線圈座、磁鐵及支承座，該線圈可導通電流，以與磁鐵產生磁感應，使該線圈座可相對該磁鐵移動，該支承座與該殼體配合將該線圈座及磁鐵收容於該收容空間內，該支承座中部開設一透光孔，從該透鏡入射之光線經該透光孔投射至該影像感測器，其改良在於：該支承座鄰近該線圈座之端面設有環繞該透光孔之集塵區，該集塵區塗有黏結劑。A camera module includes a lens, a carrier for carrying the lens, a voice coil motor for driving the carrier, and an image sensor, the voice coil motor including a housing having a receiving space, and a coil around the coil a seat, a magnet and a support base, the coil can conduct a current to generate magnetic induction with the magnet, so that the coil base can move relative to the magnet, and the support seat cooperates with the housing to receive the coil base and the magnet in the receiving space, A light-transmitting hole is defined in a middle portion of the support seat, and light incident from the lens is projected to the image sensor through the light-transmitting hole, and the improvement is that the support seat is adjacent to the light-emitting hole of the end surface of the coil base. In the dust collecting area, the dust collecting area is coated with a binder.

如申請專利範圍第8項所述之相機模組，其中該集塵區之內側邊緣形成有朝靠近該線圈座方向延伸之擋塵壁。The camera module of claim 8, wherein the inner edge of the dust collecting area is formed with a dustproof wall extending toward the coil holder.

如申請專利範圍第8項所述之相機模組，其中該集塵區為開設於該端面之環形凹槽。The camera module of claim 8, wherein the dust collecting area is an annular groove formed in the end surface.