KR101847640B1 - Lens actuator and imaging apparatus including the same - Google Patents

Lens actuator and imaging apparatus including the same Download PDF

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Publication number
KR101847640B1
KR101847640B1 KR1020150173722A KR20150173722A KR101847640B1 KR 101847640 B1 KR101847640 B1 KR 101847640B1 KR 1020150173722 A KR1020150173722 A KR 1020150173722A KR 20150173722 A KR20150173722 A KR 20150173722A KR 101847640 B1 KR101847640 B1 KR 101847640B1
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KR
South Korea
Prior art keywords
bobbin
coil
lens actuator
yoke
magnet
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KR1020150173722A
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Korean (ko)
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KR20170067261A (en
Inventor
정필선
김동영
안치호
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주식회사 에이스솔루텍
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Priority to KR1020150173722A priority Critical patent/KR101847640B1/en
Publication of KR20170067261A publication Critical patent/KR20170067261A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • G02B7/09—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification adapted for automatic focusing or varying magnification
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B3/00—Focusing arrangements of general interest for cameras, projectors or printers
    • G03B3/10—Power-operated focusing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K33/00—Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H04N5/2254—

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Optics & Photonics (AREA)
  • Lens Barrels (AREA)

Abstract

A lens actuator and an imaging apparatus including the same are disclosed. The disclosed lens actuator includes a support base, a bobbin disposed on the support base and accommodating the lens unit, a coil arranged to surround the outer periphery of the bobbin, and a coil disposed on opposite sides of the bobbin, 1 and a second magnet; and a yoke that is provided to house the coil and the magnet member on the support base, and includes at least six bent portions that are bent and inserted between the bobbin and the coil. The yoke may include eight bends. The eight bent portions may be divided into two on each side of the bobbin.

Description

[0001] LENS ACTUATOR AND IMAGING DEVICE COMPRISING THE SAME [0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical apparatus, and more particularly, to a lens actuator and an imaging apparatus including the same.

BACKGROUND ART [0002] In recent years, as a digital image pickup apparatus, a small-sized optical apparatus such as a mobile communication apparatus such as a mobile phone or a digital camera has become widespread. A variety of lens actuators are used as a driving device for auto focusing or zooming in a camera module mounted in such a digital image pickup device. A voice coil motor (VCM) method is mainly applied to a lens actuator of a camera module mounted in a mobile communication device.

As miniaturization / slimming and high performance of mobile communication devices and various optical devices have progressed, there has been a demand for miniaturization / slimming and high performance of camera modules and lens actuators applied to these devices. Particularly, in the case of a lens actuator, a structure capable of exhibiting a high driving force with a small size / thickness is required. However, it may not be easy to realize such a configuration. In developing the lens actuator, it is also necessary to consider cost competitiveness through reduction of production cost and reduction of power consumption.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems occurring in the prior art, and it is an object of the present invention to provide a lens actuator which is advantageous in miniaturization and slimness but has excellent performance and high driving force (electromagnetic force).

It is another object of the present invention to provide a lens actuator capable of reducing manufacturing cost.

It is another object of the present invention to provide a lens actuator capable of reducing power consumption through low current driving.

The present invention also provides an imaging apparatus using the lens actuator.

According to one aspect of the present invention, A bobbin disposed on the support base and accommodating the lens unit; A coil disposed to surround the outer periphery of the bobbin; A magnet member having first and second magnets disposed on opposite sides of the coil with the bobbin therebetween; And a yoke provided to house the coil and the magnet member on the support base, wherein the yoke includes at least six bent portions bent and inserted between the bobbin and the coil, wherein the electromagnetic force generated by the coil, the magnet member, A lens actuator for adjusting the position of the bobbin is provided.

The yoke may have eight bends.

The eight bent portions may be equally divided into two by four on the bobbin.

The height h of the coil, the magnet member, and the drive unit incorporating the yoke may be greater than or equal to 2.3 mm and less than or equal to 2.8 mm.

The ratio of the height (h) to the width (w) of the coil, the magnet member, and the driving unit in which the yoke is assembled may satisfy 0.270 <h / w <0.330.

Wherein the lens actuator comprises: a first plate spring provided between the support base and the bobbin; And a second plate spring disposed between the bobbin and the yoke.

Wherein the first plate spring comprises: an inner ring having four nodes; And four extending portions extending from the four nodal portions and surrounding the outer periphery of the inner ring and having an end protruding outside the inner ring. Each of the four extensions may include a mounting hole for engagement with the support base.

The first and second plate-like springs may have a thickness of, for example, greater than 0.045 mm.

According to another aspect of the present invention, there is provided a zoom lens comprising: the lens actuator described above; A lens unit mounted on the lens actuator; An image sensor disposed on an exit surface side of the lens unit; And a circuitry for processing the signal sensed by the image sensor.

The imaging device may be applied to an electronic device, e.g., a mobile phone.

According to another aspect of the present invention, A bobbin disposed on the support base and accommodating the lens unit; A coil disposed to surround the outer periphery of the bobbin; A magnet member having first and second magnets disposed on opposite sides of the coil with the bobbin therebetween; A yoke provided on the support base to house the coil and the magnet member, the yoke including a plurality of bends inserted bendingly between the bobbin and the coil; A first plate spring provided between the support base and the bobbin; And a second plate spring disposed between the bobbin and the yoke,

Wherein the first plate spring comprises: an inner ring having four nodes; And four extending portions extending from the four nodal portions and surrounding the outer periphery of the inner ring and having an end protruding outside the inner ring, And a mounting hole for coupling the lens actuator.

It is possible to realize a lens actuator having a superior performance and a high driving force (electromagnetic force) while being advantageous in downsizing / slimming. It is possible to realize a lens actuator capable of reducing production cost. A low-current drive can reduce the power consumption of the lens actuator. By applying the above-described lens actuator, a high-performance imaging apparatus can be realized.

1 is an exploded perspective view of a lens actuator according to an embodiment of the present invention.
2 is a perspective view of a lens actuator to which the components of FIG. 1 are coupled.
3 is a cross-sectional view illustrating a cross-sectional structure taken along the line III-III 'of FIG.
4 is a top plan view of the lens actuator of FIG. 2 viewed from above.
5A and 5B are perspective views showing the top and bottom portions of the yoke described with reference to Figs. 1 to 4, respectively.
6 (A) and 6 (B) are perspective views showing the upper surface portion and the lower surface portion of the bobbin described with reference to Figs. 1 to 4, respectively.
FIG. 7 is a perspective view showing a first plate spring that can be applied to the lens actuator described with reference to FIGS. 1 to 4. FIG.
FIG. 8 is a perspective view showing a second plate-like spring that can be applied to the lens actuator described with reference to FIGS. 1 to 4. FIG.
FIG. 9 is a graph showing a simulation result of the intensity of a magnetic field generated by a lens actuator according to an embodiment of the present invention.
10 is a graph showing a simulation result of the intensity of a magnetic field generated by a lens actuator according to a comparative example compared with the present invention.
11 is a block diagram showing a schematic configuration of an imaging apparatus to which a lens actuator can be applied in an embodiment of the present invention.
12 is a perspective view exemplarily showing an electronic device to which an imaging apparatus including a lens actuator according to an embodiment of the present invention can be applied.

Hereinafter, a lens actuator according to embodiments of the present invention and an imaging apparatus including the same will be described in detail with reference to the accompanying drawings. The width and thickness of the layers or regions illustrated in the accompanying drawings may be somewhat exaggerated for clarity and ease of description. Like reference numerals designate like elements throughout the specification.

1 is an exploded perspective view of a lens actuator according to an embodiment of the present invention. FIG. 2 is a perspective view of a lens actuator to which the components of FIG. 1 are coupled, and FIG. 3 is a cross-sectional view illustrating a cross-sectional structure taken along the line III-III 'of FIG.

Referring to FIG. 1, the lens actuator 1000 according to the present embodiment may include a supporting base 100. The support base 100 may have a substantially rectangular frame structure and may have a window region 105 that allows light to pass through the center thereof. The support base 100 may include guide portions (pillar portions) 110 vertically protruding from four corners. A first engaging projection 111 may be provided on one side of the lower end of each guide portion 110. [ The first coupling protrusion 111 may be for coupling with the second mounting hole 322 of the first plate spring 300 to be described later. The second coupling protrusions 112 may be provided on the upper ends of the guide portions 110. The second engaging projection 112 may be for engaging with the second mounting hole 622 of the second plate spring 600 to be described later.

A bobbin 400 that accommodates a lens unit (not shown) may be disposed on the support base 100. The bobbin 400 may be referred to as a 'lens bobbin', a 'driving bobbin', or a 'lens carrier'. A threaded portion 415 may be formed on the inner circumference of the bobbin 400. A screw portion corresponding to the threaded portion 415 of the bobbin 400 may be formed on the outer periphery of the lens unit (lens module / barrel) (not shown), and the lens unit may be mounted on the bobbin 400 . A plurality of first coupling protrusions 411 may be provided on the lower surface of the bobbin 400 and a plurality of second coupling protrusions 412 may be provided on the upper surface of the bobbin 400. [ The first engaging projection 411 may be for engaging the first mounting hole 311 of the first plate spring 300 and the second engaging projection 412 may be for engaging the first plate spring 300 And may be for engagement with the mounting hole 611. A flange portion 420 protruding to the outside of the bobbin 400 may be provided at a lower end of the bobbin 400. A plurality of grooves 430 may be formed on the outer circumferential surface of the bobbin 400 to extend inward of the bobbin 400. When the outer periphery of the bobbin 400 is assumed to be substantially tetragonal, two grooves 430 may be provided on each of four sides of the tetragonal shape. Therefore, the total number of the grooves 430 may be eight.

A coil 500 arranged to surround the outer periphery of the bobbin 400 may be provided. The coil 500 may be provided on the flange 420 of the bobbin 400 so as to surround the outer periphery of the bobbin 400. For convenience, the coil 500 is simply shown, but in practice, the coil 500 may have a structure in which thin wires are wound several times (wound).

First and second magnets 210 and 220 disposed on opposite sides of the coil 500, respectively. The first and second magnets 210 and 220 may be combined into a single magnet member 200. The first magnet 210 may be disposed in a space provided by the pair of guide portions 110 of the support base 100 and the second magnet 220 may be disposed in a space provided by the other pair of guide portions 110 Space. The first magnet 210 may cover most of one side of the quadrilateral lens actuator 1000 and the second magnet 220 may cover the other side of the lens actuator 1000 have. The first and second magnets 210 and 220 may be disposed to face each other with the bobbin 400 and the coil 500 interposed therebetween and in parallel with each other. With respect to the use of the two magnets 210 and 220, the driving force (electromagnetic force) of the lens actuator 1000 can be improved and the total number of parts can be reduced. In the case of the conventional lens actuator, generally, four magnets are used because one magnet is provided for each of four corners (corner portions). In this case, since the magnet is disposed at the corner (corner portion) of the actuator, the power generation efficiency relative to the area decreases and it may be difficult to improve the driving force (electromagnetic force). Therefore, when reducing the size / height of the lens actuator, it may be difficult to secure a desired level of driving force (electromagnetic force). Further, since the total number of used parts increases, the manufacturing cost increases and the efficiency of the assembling process may deteriorate.

A yoke 700 for housing a coil 400 and a magnet member 200 or the like may be provided on the support base 100. The yoke 700 may be called a 'shield case'. The yoke 700 may have a body portion (hereinafter referred to as a yoke body portion) 710. The yoke main body 710 may have a hollow structure 705 at its center with a lid structure as a whole. The hollow portion 705 may have a substantially tetragonal shape and its position may correspond to the window region 105 of the support base 100. The yoke 700 may have a plurality of bent portions 750 that are bent and inserted between the bobbin 400 and the coil 500. The bending portion 750 may be six or more. As a specific example, the number of bent portions 750 may be eight. The plurality of bending portions 750 may be inserted into the plurality of grooves 430 provided on the outer periphery of the bobbin 400. When eight bending portions 750 are provided, they may be equally divided into two pieces on four sides of the bobbin 400. Two of the eight bends 750 may be disposed to face the first magnet 210 and the other two may be disposed to face the second magnet 220 (see FIG. 4). The remaining four bends 750 may be arranged vertically or substantially perpendicular to the two magnets 210 and 220 in pairs (see FIG. 4). The entire yoke 700 having the body portion 710 and the plurality of bent portions 750 extending therefrom can be a single body formed of a single material. Accordingly, all of the bent portions 750 may be connected to the body portion 710 and affect each other. In addition, all bent portions 750 can contribute to driving force (electromagnetic force) of the lens actuator 1000. The driving force (electromagnetic force) of the lens actuator 1000 can be improved by the structure of the yoke 700 and the structure / arrangement of the magnet member 200 and the coil 500 associated therewith. This will be described later in more detail.

A first plate spring 300 may be provided between the support base 100 and the bobbin 400. [ A second plate spring 600 may be provided between the bobbin 400 and the yoke 700. The first and second plate-type springs 300 and 600 may elastically support the bobbin 400 moving along the optical axis by an electromagnetic force. At least one of the first and second plate type springs 300 and 600, for example, the first plate type spring 300, may also serve as a connection wiring for applying an electrical signal to the coil 500. When the first plate spring 300 serves as the connection wiring, the first plate spring 300 may include first and second power terminals 351 and 352. An electric signal (current) can be applied to the coil 500 through the first and second power supply terminals 351 and 352.

The first plate type spring 300 may have, for example, four first mounting holes 311 and four second mounting holes 322. [ The first mounting hole 311 may be coupled to the first engaging projection 411 of the bobbin 400 and the second mounting hole 322 may be engaged with the first engaging projection 111 of the supporting base 100 . The second plate-shaped spring 600 may have, for example, four first mounting holes 611 and four second mounting holes 622. [ The first mounting hole 611 may be coupled to the second coupling protrusion 412 of the bobbin 400 and the second mounting hole 622 may be coupled to the second coupling protrusion 112 of the support base 100 . The specific structure of the first and second plate-type springs 300 and 600 will be described later in detail with reference to FIGS. 7 and 8. FIG. The structures and roles of the first and second plate-type springs 300 and 600 described above are exemplary and their structures can be variously modified. In some cases, at least one of the first and second plate-type springs 300 and 600 may not be used, or may be replaced with another element having a similar role.

When the components shown in Fig. 1 are combined (assembled) as described above, the structure shown in Fig. 2 can be obtained. Referring to FIG. 2, an opening region (hollow portion) is present inside the lens actuator 1000, and a threaded portion 415 of the bobbin (400 in FIG. 1) may be exposed on the inner peripheral surface thereof. A lens unit (lens module / barrel) (not shown) can be coupled to the threaded portion 415. A part of the support base 100 may be exposed at the lower end of the lens actuator 1000 and a cover member 400 covering the magnet member (200 in FIG. 1), the bobbin (400 in FIG. 1) A yoke 700 may be provided. A plurality of bends 750 extending from the yoke 700 can be inserted between the bobbin (400 in FIG. 1) and the coil (500 in FIG. 1).

3 is a cross-sectional view illustrating a cross-sectional structure taken along the line III-III 'of FIG. 3, the coil 500 may be arranged to surround the outer periphery of the bobbin 400 and the bent portions 750 of the yoke 700 may be inserted between the bobbin 400 and the coil 500 . The first and second magnets 210 and 220 may be disposed on both sides of the coil 500 so as to face each other. Accordingly, the coil 500 may be disposed between the magnets 210 and 220 and the bobbin 400. [

The position of the bobbin 400 can be adjusted / controlled by using the electromagnetic force (driving force) of the coil 500, the magnet members 210 and 220, and the yoke 700 in the lens actuator 1000 structure. That is, the position of the bobbin 400 can be moved along the optical axis (up and down in the drawing). Thus, the focus of a lens unit (not shown) mounted in the bobbin 400 can be adjusted. In other words, auto focusing function can be performed.

According to the embodiment of the present invention, the magnet member 200 = 210 + 220 and the bobbin 400, the coil 500, and the yoke 700 are appropriately designed and arranged so that excellent performance and high driving force (electromagnetic force) And the lens actuator 1000 can be easily miniaturized and slimmed down. Particularly, by providing six or more bent portions 750 of the yoke 700 (for example, eight) and dispersing them on all four sides of the bobbin 400, the electromagnetic force can be applied to the entire bobbin 400 relatively strongly Respectively. In the conventional case where the two magnets 210 and 220 are arranged parallel to both sides of the support base 100 in the form of a square (ex, square), and the magnet is disposed at four corners of the actuator So that a higher electromagnetic force can be secured.

As described above, according to the embodiment of the present invention, high electromagnetic force can easily be ensured. Therefore, even if the size / height of the lens actuator 1000 is reduced, a driving force similar to or superior to the conventional one can be secured. In this regard, the height of the driving portion (h in Fig. 3) in the lens actuator 1000 may be as small as about 2.8 mm or less. The height h of the driving unit may be about 2.3 to 2.8 mm. For example, the height h of the driving unit may be as small as about 2.3 to 2.6 mm. Here, the driving unit refers to a structure in which the magnet member 200 = 210 + 220, the coil 500, and the yoke 700 are combined and contributes to the movement, that is, the driving of the bobbin 400 . The height h of the driving unit may correspond to the height h of the yoke 700. Therefore, the height h of the yoke 700 may be about 2.8 mm or less. For example, the height h of the yoke 700 may be about 2.3 to 2.8 mm or about 2.3 to 2.6 mm. Meanwhile, the width w of the driving unit, that is, the width w of the lens actuator 1000 may be, for example, about 8.5 mm. Therefore, the ratio of the height (h) to the width (w) of the driving unit can satisfy 0.270 <h / w <0.330. Here, the width w of the driving unit may correspond to the width w of the yoke 700. Therefore, the ratio of the height h to the width w of the yoke 700 can satisfy 0.270 &lt; h / w &lt; 0.330. The ratio of the height h to the width w can be reduced to about 0.270 to 0.330, so that the lens actuator 1000 can be easily made slim and compact. When the height h of the driving unit is minimized, the overall height of the lens actuator 1000 can be minimized. If necessary, the total height of the lens actuator 1000 can be appropriately selected from about 2.7 to 4.1 mm.

According to the embodiment of the present invention, high electromagnetic force can easily be ensured, so that the high-strength elastic body can be easily applied to the first and second plate-shaped springs 300 and 600. As the material of the first and second plate type springs 300 and 600, for example, an alloy containing tin (Sn) may be used. In addition, the thickness of each of the first and second plate-shaped springs 300 and 600 can be increased to about 0.045 mm or more. As a specific example, the thickness of each of the first and second plate-type springs 300 and 600 may be about 0.05 mm. Since the plate-like springs 300 and 600 having a relatively large thickness can be used, the reliability and durability of the lens actuator 1000 can be improved. In the case of the lens actuator according to the prior art, since the electromagnetic force (driving force) is relatively low, it may be difficult to use a spring member of a predetermined thickness or more, and in this connection, it may be difficult to improve reliability and durability. However, according to the embodiment of the present invention, such conventional problems can be overcome. In addition, according to the embodiment of the present invention, high electromagnetic force can be ensured without applying a high current / high power to the coil 500, so that there is an advantage that power consumption can be reduced. In this regard, when manufacturing the coil 500, it is possible to reduce the number of turns (i.e., the number of turns) of the wire, and drive the lens actuator 1000 with low resistance and low power.

In addition, according to the embodiment of the present invention, the number of constituent parts for constituting the lens actuator 1000 can be minimized, and therefore, it can be advantageous in reducing the production cost and securing the price competitiveness. According to the embodiment of the present invention, the lens actuator 1000 can be manufactured by a total of five kinds of eight parts. The support base 100 and the bobbin 400 can be two kinds of one kind and the first and second magnets 210 and 220 can be two types of one kind, The plate-shaped springs 300 and 600 may be two kinds of parts, and the coil 500 and the yoke 700 may be added to the plate springs 300 and 600 to form a total of five kinds of eight parts. The lens actuator 1000 according to the embodiment of the present invention can be configured with a relatively small number of parts as compared with the lens actuator according to the related art including a total of 11 parts in total. Therefore, it can be advantageous in terms of production cost reduction, process efficiency improvement, productivity improvement, and price competitiveness.

4 is a top plan view of the lens actuator 1000 of FIG. 2 viewed from above. For convenience, the magnet members 210 and 220, the coil 500, and the yoke 700 are schematically shown in FIG. 4 without a bobbin (400 in FIG. 1).

Referring to FIG. 4, the annular coil 500 may be provided, and the first and second magnets 210 and 220 may be disposed on one side and the other side. A yoke 700 covering the coil 500 and the two magnets 210 and 220 may be provided. The yoke 700 may include a plurality of bends 750 extending inward of the coil 500. For example, eight bends 750 may be uniformly or substantially uniformly distributed. Assuming that the lens actuator 1000 has a substantially square shape, the eight bending portions 750 may be arranged to correspond to two sides of the square structure. Two of the plurality of bends 750 may be disposed to correspond to the first magnet 210 and the other two may be disposed to correspond to the second magnet 220. [ The remaining four bends 750 may be arranged vertically or substantially perpendicular to the two magnets 210 and 220 in pairs.

5A and 5B are perspective views showing the top and bottom portions of the yoke 700 described with reference to Figs. 1 to 4, respectively. As described above, the yoke 700 may include a yoke main body 710 and a plurality of bent portions 750.

6A and 6B are perspective views showing the upper surface and the lower surface of the bobbin 400 described with reference to Figs. 1 to 4, respectively. The bobbin 400 may include a first engaging projection 411, a second engaging projection 412, a threaded portion 415, a flange portion 420, and a plurality of grooves 430.

FIG. 7 is a perspective view showing a first plate-shaped spring 300 that can be applied to the lens actuator 1000 described with reference to FIGS.

Referring to FIG. 7, the first plate spring 300 may have an inner ring 310 having four nods 305. The first plate spring 300 has four extending portions extending from the four nodal portions 305 and surrounding the outer periphery of the inner ring 310 and having an end protruding outward from the inner ring 310 320). The first mounting holes 311 may be formed in the respective barbs 305. In addition, each extending portion 320 may be provided with a second mounting hole 322. The first mounting hole 311 may be for engagement with the bobbin 400 and the second mounting hole 322 may be for engagement with the support base 100. First and second power terminals 351 and 352 may be provided at two adjacent ends of the four extension portions 320. As such, when the first plate spring 300 has four extensions 320 on the outside of the inner ring 310, it can have an excellent elastic force with respect to this structure. However, the specific structure of the first plate-like spring 300 is not limited to that shown in Fig. 7, and can be variously changed. Meanwhile, the thickness of the first plate-type spring 300 may be about 0.045 mm or more, but the present invention is not limited thereto and may vary depending on the case.

FIG. 8 is a perspective view showing a second plate-shaped spring 600 applicable to the lens actuator 1000 described with reference to FIGS.

Referring to FIG. 8, the second plate spring 600 may have an inner ring 610 having four nodal portions 605. Four extensions 620 of a structure extending from each of the four nose portions 605 and surrounding the inner ring 610 may be further provided. The first mounting hole 611 may be formed in each of the barrel portions 605 and the second mounting hole 622 may be formed at the end of each of the extending portions 620. The inner circumference of the inner ring 610 may be circular, and the four extensions 620 may be arranged to have a substantially rectangular shape. The first mounting hole 611 may be coupled to the bobbin 400 and the second mounting hole 622 may be coupled to the support base 100. The second plate-like spring 600 having such a structure can have an excellent elastic force. However, the specific structure of the second plate-like spring 600 is not limited to that shown in Fig. 8, and can be variously changed. Meanwhile, the thickness of the second plate-shaped spring 600 may be about 0.045 mm or more, but the present invention is not limited thereto and may vary depending on the case.

FIG. 9 is a graph showing a simulation result of the intensity of a magnetic field generated by a lens actuator according to an embodiment of the present invention. In this embodiment, a yoke (shield case) having eight bent portions is used.

10 is a graph showing a simulation result of the intensity of a magnetic field generated by a lens actuator according to a comparative example compared with the present invention. In this comparative example, a yoke (shield case) having four bent portions was used.

9 and 10, although the red region is widely distributed in the coil of FIG. 9, it can be seen that there is no red region in the coil of FIG. 10, and the blue region or the green region is mainly distributed. The red color exhibits a strong magnetic field, so that the structure of FIG. 9 can generate an electromagnetic force (driving force) stronger than the structure of FIG. Therefore, as compared with the case of using four bending portions as in Fig. 10 (comparative example), it is quite advantageous to use eight bending portions arranged in all directions as in Fig. 9 (embodiment) to realize a strong driving force (electromagnetic force) .

11 is a block diagram showing a schematic configuration of an imaging apparatus to which a lens actuator can be applied in an embodiment of the present invention.

11, the lens unit 1100 can be mounted in the lens actuator 1000, and the image sensor 1200 can be disposed on the emission surface side of the lens unit 1100. The image of the subject OBJ can be imaged on the image sensor 1200 by the lens unit 1100. [ It can be said that the lens actuator 1000, the lens unit 1100 and the image sensor 1200 constitute one optical unit 1500.

A signal processor 2000 connected to the image sensor 1200 may be provided. The signal processing unit 2000 may include a circuit unit for processing the signal sensed by the image sensor 1200. [ And a control unit 3000 connected to the lens actuator 1000 and controlling the operation of the lens actuator 1000. The focus of the lens unit 1100 can be automatically adjusted by the control unit 3000. [

A central processing unit (CPU) 4000 connected to the signal processing unit 2000 and the control unit 3000 may be provided. Also, a memory 5000 and a display 6000 connected to the central processing unit 4000 may be provided. The memory 5000 may store various data necessary for the operation of the imaging apparatus, data on the photographed image, and the like. The display 6000 may be a device for displaying data on photographed images and various other information. The central processing unit 4000 can control the signal processing unit 2000, the control unit 3000, the memory 5000, the display 6000, and the like, and perform related arithmetic / processing operations.

The lens actuator 1000 according to various embodiments of the present invention described with reference to Figs. 1 to 9 can be applied to the lens actuator 1000 of Fig. In addition, the specific configuration of the lens actuator 1000 may be variously modified as mentioned above. The configuration of the imaging apparatus described with reference to Fig. 11 is merely an example, and this can also be variously changed.

12 is a perspective view exemplarily showing an electronic device (optical electronic device) to which an imaging apparatus including a lens actuator according to an embodiment of the present invention can be applied. 12 illustrates an exemplary mobile phone. A lens actuator according to an embodiment of the present invention can be applied to an optical unit of such a mobile phone, for example, a camera module.

Fig. 12 is an exemplary illustration of an electronic device to which an imaging device including a lens actuator can be applied, and the lens actuator or an imaging device including the lens actuator can be applied to various electronic devices (optical devices). For example, a lens actuator and an imaging device according to embodiments of the present invention can be applied to a digital camera, a personal digital assistant (PDA), a personal multimedia player (PMP), and various portable / small electronic devices (optical devices). The lens actuator may also be applied for other functions than the auto focusing function, such as for zooming or other functions.

While many have been described in detail above, they should not be construed as limiting the scope of the invention, but rather as examples of specific embodiments. For example, those skilled in the art will appreciate that the configuration of the lens actuator 1000 described with reference to FIGS. 1 through 8 can be variously modified. For example, the structure of the support base 100 and the bobbin 400, and the structure of the first and second plate springs 300 and 600 may be variously modified. It will also be appreciated that at least one of the first and second plate-type springs 300, 600 may be replaced with other elements that are not used or play a similar role. It should also be understood that the configuration / type of the imaging apparatus and the electronic apparatus described with reference to Figs. 11 and 12 may be variously changed. Therefore, the scope of the invention is not to be determined by the illustrated embodiment but should be determined by the technical idea described in the claims.

Description of the Related Art [0002]
100: yoke 105: window area
110: guide portion 111: first engaging projection of yoke
112: second coupling protrusion of the yoke 200: magnet member
210: first magnet 220: second magnet
300: first plate spring 305:
310: inner ring 311: first mounting hole
320: extension part 322: second mounting hole
351: first power terminal 352: second power terminal
400: bobbin 411: first engaging projection of the bobbin
412: second engaging projection 415 of the bobbin:
420: flange portion 430: groove
500: coil 600: second plate spring
605: nodal portion 610: inner ring
611: first mounting hole 620: extension part
622: second mounting hole 700: yoke
705: hollow part 710: yoke body part
750: yoke bending part 1000: lens actuator
1100: lens unit 1200: image sensor
1500: optical unit 2000: signal processor
3000: control unit 4000: central processing unit
5000: Memory 6000: Display

Claims (9)

A support base;
A bobbin disposed on the support base and accommodating the lens unit;
A coil disposed to surround the outer periphery of the bobbin;
A magnet member having first and second magnets disposed on opposite sides of the coil with the bobbin therebetween; And
And a yoke provided to house the coil and the magnet member on the support base, the yoke including eight bent portions bent and inserted between the bobbin and the coil,
Wherein the lens actuator has four sides that form a quadrangle, the first magnet is disposed corresponding to a first side of the four sides, and the second magnet is arranged to face the first side of the four sides The magnet is not provided on the third side and the fourth side portion of the four sides,
Two of the eight bent portions are arranged so as to face the first magnet, the other two are arranged to face the second magnet, the other two are arranged to face the third side, Is arranged to face the fourth side,
The lens actuator adjusts the position of the bobbin by using electromagnetic force generated by the coil, the magnet member, and the yoke. delete delete The method according to claim 1,
Wherein the height h of the coil, the magnet member, and the drive unit incorporating the yoke is greater than or equal to 2.3 mm and less than or equal to 2.8 mm. The method according to claim 1,
Wherein a ratio of a height (h) to a width (w) of the coil, the magnet member, and the drive unit in which the yoke is assembled satisfies 0.270 <h / w <0.330. The method according to claim 1,
A first plate spring provided between the support base and the bobbin; And
And a second plate spring disposed between the bobbin and the yoke. The method according to claim 6,
Wherein the first plate spring comprises: an inner ring having four nodes; And four extending portions extending from the four nodal portions and surrounding the outer periphery of the inner ring and having an end protruding outside the inner ring,
Each of the four extensions including a mounting hole for engagement with the support base. The method according to claim 6,
Wherein the first and second plate-shaped springs all have a thickness greater than 0.045 mm. A lens actuator according to any one of claims 1 and 4 to 8;
A lens unit mounted on the lens actuator;
An image sensor disposed on an exit surface side of the lens unit; And
And a circuitry for processing the signal sensed by the image sensor.
KR1020150173722A 2015-12-08 2015-12-08 Lens actuator and imaging apparatus including the same KR101847640B1 (en)

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KR102560085B1 (en) * 2017-09-29 2023-07-27 엘지이노텍 주식회사 Lens driving device, camera module and optical apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012083797A (en) * 2012-02-03 2012-04-26 Mitsumi Electric Co Ltd Actuator mechanism, camera module, and camera
JP2014085560A (en) 2012-10-25 2014-05-12 Ricoh Imaging Co Ltd Correction optical device and photographing device
KR101459585B1 (en) 2013-09-30 2014-11-07 주식회사 하이소닉 Camera actuator increased driving force of lens for portable device
JP2015049334A (en) 2013-08-30 2015-03-16 オリンパスイメージング株式会社 Lens driving device, lens barrel and imaging device applying the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012083797A (en) * 2012-02-03 2012-04-26 Mitsumi Electric Co Ltd Actuator mechanism, camera module, and camera
JP2014085560A (en) 2012-10-25 2014-05-12 Ricoh Imaging Co Ltd Correction optical device and photographing device
JP2015049334A (en) 2013-08-30 2015-03-16 オリンパスイメージング株式会社 Lens driving device, lens barrel and imaging device applying the same
KR101459585B1 (en) 2013-09-30 2014-11-07 주식회사 하이소닉 Camera actuator increased driving force of lens for portable device

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