TWI608266B - Lens driving module - Google Patents

Description

Lens drive module

The invention relates to a lens driving module. More specifically, the present invention relates to a lens driving module for carrying and moving a lens.

With the development of technology, many electronic devices (such as smart phones or digital cameras) now have the functions of photography or video recording. The use of these electronic devices is becoming more common and is moving toward a convenient, aesthetically pleasing and slimmer design to provide users with more choices.

However, due to the aforementioned thin and light design, the conventional zoom lens is difficult to be placed in a miniaturized electronic device. Therefore, how to solve the above problem has become an important issue.

In order to solve the above problems, the present invention provides a lens driving module for carrying and moving a lens. The lens driving module includes a lens holder having a receiving space, a driving coil, and a strip shape. a plurality of first magnetic elements, a virtual plane, and a plurality of second magnetic elements, wherein the lens is disposed in the accommodating space, and the lens holder is located between the first magnetic element and the second magnetic element between. The driving coil is disposed on the lens driving module and surrounds the accommodating space. The virtual plane is perpendicular to the long axis direction of the elongated structure, and the driving coil and the first magnetic element are in a virtual plane along the long axis direction of the elongated structure The projections on top overlap each other. When a first current flows through the drive coil, the lens holder moves in a first direction relative to the first magnetic element and the second magnetic element.

In an embodiment of the invention, the first magnetic element faces a slope of one of the drive coils.

In an embodiment of the invention, a gap is formed between two first magnetic elements disposed on one side of the drive coil.

In an embodiment of the invention, the lens driving module further includes a third magnetic component disposed in the gap.

In an embodiment of the invention, the width of the third magnetic element is smaller than the width of the first magnetic element.

In an embodiment of the invention, the third magnetic element does not protrude from the outer side surface of the first magnetic element.

In an embodiment of the invention, the first magnetic element has a recessed portion, and the drive coil enters the recessed portion.

In an embodiment of the invention, the length of the drive coil is greater than its width.

In an embodiment of the invention, at least a portion of the drive coil enters the gap.

In an embodiment of the invention, a distance between the driving coil and an outer side surface of the first magnetic element is smaller than a distance between the driving coil and an outer side surface of the second magnetic element.

In an embodiment of the invention, the first direction is perpendicular to a long axis direction of the elongated structure.

In an embodiment of the invention, the lens driving module further includes a frame a first elastic member and a second elastic member, wherein the first and second elastic members are coupled to the lens holder and the frame, and the lens holder is located between the first elastic member and the second elastic member. The frame houses the lens holder, and the first magnetic element and the second magnetic element are fixed to the frame.

In an embodiment of the invention, the lens driving module further includes a base and a plurality of loop wires, wherein the base includes a coil plate, and the loop wire connects the coil plate and the first elastic member. When a second current flows through the coil plate, the lens holder moves in a second direction relative to the base, and the first direction is perpendicular to the second direction.

In an embodiment of the invention, the pedestal further includes a circuit board electrically connected to the coil slab.

In an embodiment of the invention, the lens driving module further includes at least one position detector disposed on the base.

In an embodiment of the invention, the position detector comprises a Hall effect sensor, a magnetoresistance effect sensor, a giant magnetoresistance effect sensor, a tunneling magnetoresistance effect sensor, or a magnetic flux sensor.

10‧‧‧Lens driver module

20‧‧‧Electronic devices

30‧‧‧ lens

100‧‧‧Upper cover

200‧‧‧ lens holder

210‧‧‧ accommodating space

220‧‧‧ concave structure

300‧‧‧ drive coil

310‧‧‧ Corresponding Department

320‧‧‧ Non-corresponding department

400‧‧‧Frame

410‧‧‧Receiving Department

420‧‧‧ Groove

500‧‧‧First magnetic component

511‧‧‧Bevel

512‧‧‧ outside surface

530‧‧‧ Third magnetic component

600‧‧‧Second magnetic component

610‧‧‧ outside surface

700‧‧‧ring loop

800‧‧‧ position detector

810‧‧‧X-axis position detector

820‧‧‧Y-axis position detector

900‧‧‧Base

910‧‧‧ coil plate

920‧‧‧ boards

930‧‧‧Under the cover

E1‧‧‧First elastic element

E11‧‧‧ inner circle

E12‧‧‧ outer circle

E2‧‧‧Second elastic element

E21‧‧‧ inner circle

E22‧‧‧ outer ring segment

G‧‧‧ gap

L‧‧‧ length

S‧‧‧ accommodating space

T1‧‧‧ distance

T2‧‧‧ distance

V‧‧‧ virtual plane

W‧‧‧Width

W1‧‧‧Width

W2‧‧‧Width

1 is a schematic view showing an electronic device according to an embodiment of the present invention.

2 is a schematic view showing a lens driving module according to an embodiment of the present invention.

Fig. 3 is a view showing an exploded view of a lens driving module according to an embodiment of the present invention.

Fig. 4 is a cross-sectional view taken along line A-A in Fig. 2;

Fig. 5 is a cross-sectional view taken along line B-B in Fig. 2;

Fig. 6 is a view showing a drive coil of an embodiment of the present invention.

Fig. 7 is a view showing the positional relationship between the driving coil and the first and second magnetic members in an embodiment of the present invention.

Figure 8 is a view showing the positional relationship between the driving coil and the first and second magnetic members in another embodiment of the present invention.

Figure 9 is a view showing the positional relationship between the driving coil and the first and second magnetic members in another embodiment of the present invention.

The lens driving module of the embodiment of the present invention will be described below. However, it will be readily understood that the embodiments of the present invention are susceptible to many specific embodiments of the invention and can The specific embodiments disclosed are merely illustrative of the invention, and are not intended to limit the scope of the invention.

Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning meaning It will be understood that these terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning consistent with the relevant art and the context or context of the present disclosure, and should not be in an idealized or overly formal manner. Interpretation, unless specifically defined herein.

First, referring to FIG. 1 , a lens driving module 10 according to an embodiment of the present invention can be installed in an electronic device 20 to carry a lens 30 and drive the lens 30 relative to the photosensitive element in the electronic device 20 . Move to achieve the purpose of adjusting the focus and shaking compensation. The aforementioned electronic device 20 is, for example, a smart phone or a digital camera having a camera or photography function.

Figs. 2 and 3 respectively show a perspective view and an exploded view of the lens driving module 10, and Figs. 4 and 5 respectively show cross-sectional views in the A-A and B-B directions in Fig. 2 . As shown in FIGS. 2 and 3 , the lens driving module 10 mainly includes an upper cover 100 , a first elastic component E1 , a lens holder 200 , a driving coil 300 , a frame 400 , and a plurality of first magnetic components 500 . a plurality of second magnetic elements 600, a second elastic element E2, a plurality of loop wires 700, a plurality of position detectors 800, and a base 900.

Referring to FIGS. 3~5, the lens holder 200 has an accommodating space 210 and a concave structure 220. The accommodating space 210 is formed in the center of the lens holder 200, and the concave structure 220 is formed on the lens holder 200. The outer surface of the lens holder 200 surrounds the accommodating space 210. The lens 30 shown in FIG. 1 can be fixed on the lens holder 200 and accommodated in the accommodating space 210, and the driving coil 300 can be disposed in the concave structure 220.

The frame 400 has a receiving portion 410 and a plurality of grooves 420. The lens holder 200 is housed in the housing portion 410. The first and second magnetic members 500, 600 are fixed in the recess 420 and adjacent to the drive coil 300. In the Y-axis direction, the lens holder 200 is positioned between the aforementioned first magnetic members 500, and in the X-axis direction, the lens holder 200 is positioned between the second magnetic members 600. When a first current flows into the driving coil 300, electromagnetic induction is generated between the driving coil 300 and the first and second magnetic components 500, 600, so that the lens holder 200 and the lens 30 disposed thereon can be driven relative to The first and second magnetic members 500 and 600 move upward or downward in the Z-axis direction (first direction), thereby achieving the purpose of adjusting the focal length and autofocus.

As shown in FIG. 6, the driving coil 300 in this embodiment has a corresponding portion 310 and a non-corresponding portion 320, wherein the corresponding portion 310 is located at the left and right of the driving coil 300. The side, not the counterpart 320, is located above and below the drive coil 300. The distance between the aforementioned counterpart portions 310 forms the length L of the drive coil 300, and the distance between the aforementioned non-corresponding portions 320 forms the width W of the drive coil 300. In particular, the length L is greater than the width W, and the distance between the upper and lower sides of the drive coil 300 is gradually decreased from the non-corresponding portion 320 to the corresponding portion 310.

Referring to FIG. 7, it should be particularly noted that the first magnetic component 500 of the lens driving module 10 has an elongated structure, and a virtual plane V is formed perpendicular to the long axis direction L of the elongated structure, wherein The long axis direction L of the elongated structure is also perpendicular to the aforementioned first direction. A gap G may be formed between the two first magnetic elements on the same side of the drive coil 300, and the non-corresponding portion 320 of the drive coil 300 may extend toward the aforementioned gap G. Therefore, the projection formed by the driving coil 300 and the first magnetic element 500 along the long axis direction L of the elongated structure on the virtual plane V will have partial overlap.

With the aforementioned configuration of the driving coil 300 and the first magnetic element 500, the distance T1 between the driving coil 300 and the outer side surface 512 of the first magnetic element 500 will be smaller than between the driving coil 300 and the outer side surface 610 of the second magnetic element 600. The distance T2 (as shown in Figures 4 and 5). Therefore, the width of the lens driving module 10 in the Y-axis direction can be greatly reduced, which is advantageous for being accommodated in the miniaturized electronic device 20.

In addition, as shown in FIG. 7 , in the embodiment, a slope 511 facing the driving coil 300 may be formed on the first magnetic component 500 to increase an area where electromagnetic induction is generated between the driving coil 300 and the first magnetic component 500. The driving force of the lens driving module 10 is increased.

Referring to FIG. 8 , in another embodiment of the present invention, the lens driving module 10 can include a third magnetic component 530 disposed in the gap G between the first magnetic components 500 . Driving the coil 300 and the first by the arrangement of the third magnetic element 530 The area where electromagnetic induction occurs between the magnetic elements 500 can be further increased. It should be noted that the third magnetic element 530 should not protrude from the outer side surface 512 of the first magnetic element 500, and its width W1 should be smaller than the width W2 of the first magnetic element 500 to avoid making the lens driving module 10 at Y. The width in the axial direction increases.

As shown in Fig. 9, in another embodiment of the present invention, a recess 510 may be formed in a manner of performing local cutting on the first magnetic member 500 to simplify the number of components.

Referring back to FIGS. 3 to 5, the first elastic member E1 and the second elastic member E2 are respectively disposed on the upper side and the lower side of the lens holder 200/frame 400, so that the lens holder 200/frame 400 is located at both sides. between. The inner ring segment E11 of the first elastic member E1 is coupled to the lens holder 200, and the outer ring segment E12 is coupled to the aforementioned frame 400. Similarly, the inner ring segment E21 of the second elastic member E2 is coupled to the lens holder 200, and the outer ring segment E22 is coupled to the frame 400. In this way, the lens holder 200 can be suspended in the receiving portion 410 of the frame 400 by the first elastic element E1 and the second elastic element E2, and the amplitude of the movement in the Z-axis direction can also be the first. The second elastic elements E1, E2 are limited.

The susceptor 900 of the lens driving module 10 of the embodiment of the present invention includes a coil plate 910, a circuit board 920 and a lower cover 930. The coil plate 910 is fixed on the circuit board 920 and electrically connected to the circuit board 920. The circuit board 920 is fixed on the lower cover 930 and electrically connected to other electronic components (not shown) disposed in the electronic device 20. In addition, the electronic device 20 is generally disposed with a photosensitive element (not shown) corresponding to the lens 30 disposed under the susceptor 200, and the photosensitive element is fixed relative to the susceptor 200, and the light can pass through the accommodating space 210. The lens 30 is imaged on the aforementioned photosensitive element.

When a second current flows through the coil plate 910, the coil plate 910 and Electromagnetic induction will be generated between the first and second magnetic elements 500, 600, so that the lens holder 200 and the frame 400 can be moved in the X-axis direction and/or the Y-axis direction with respect to the base 900 to achieve the purpose of sway compensation. . In other words, when the aforementioned second current flows through the coil plate 910, the lens holder 200 and the frame 400 are movable in a second direction with respect to the base 900, wherein the second direction is perpendicular to the first direction.

As shown in FIG. 3, the four loop wires 700 in this embodiment are respectively disposed at four corners of the coil plate 910, and are connected to the coil plate 910, the circuit board 920, and the first elastic member E1. When the lens holder 200 and the lens 30 are movable in the second direction with respect to the frame 400, the loop wires 700 can limit the magnitude of their movement. Further, since the loop wire 700 includes a metal material (for example, copper or its alloy), it can also be used as a conductor. For example, the first current can flow into the drive coil 300 via the circuit board 920 and the loop wire 700.

In this embodiment, the position detector 800 includes an X-axis position detector 810 and a Y-axis position detector 820, both of which are fixed to the lower cover 930 of the base 900. The position of the X-axis direction position detector 810 corresponds to the aforementioned first magnetic element 500, and the position of the lens holder 200 and the lens 30 in the X-axis direction is determined by detecting the displacement of the first magnetic element 500. The position of the Y-axis direction position detector 820 corresponds to the aforementioned second magnetic element 600, and the position of the lens holder 200 and the lens 30 in the Y-axis direction is determined by detecting the displacement of the second magnetic element 600.

The position detecting component 800 can be a Hall sensor, a Magnetoresistance Effect Sensor (MR Sensor), or a Giant Magnetoresistance Effect Sensor (GMR Sensor). , Tunneling Magnetoresistance Effect Sensor (TMR Sensor), or Fluxgate (Fluxgate).

After the upper cover 100 and the lower cover 930 are assembled and fixed to each other, an accommodation space S may be formed therebetween. The lens holder 200, the driving coil 300, the frame 400, the first magnetic element 500, the second magnetic element 600, the loop wire 700, the position detector 800, the coil plate 910, the circuit board 920, the first magnetic element E1, and The second magnetic element E1 can be accommodated in the accommodating space S. It should be noted that the upper cover 100 and the base 900 are formed with openings corresponding to the accommodating space 210. Therefore, when the lens 30 moves along the Z axis, the lens 30 can pass through the opening without colliding with the upper cover 100 or the lower cover 930, and the light is also The lens 30 or the photosensitive element can be reached through these openings.

In summary, the present invention provides a lens driving module for carrying and moving a lens. Since the first magnetic component in the lens driving module includes the first segment and the second segment which are separately disposed, and the lens holder is thinner adjacent to the wall surface of the first magnetic component, the width of the lens driving module can be reduced. Furthermore, it can be installed in a narrow-edge electronic device.

Although the embodiments of the present invention and its advantages are disclosed above, it should be understood that those skilled in the art can make modifications, substitutions, and refinements without departing from the spirit and scope of the invention. In addition, the scope of the present invention is not limited to the processes, machines, manufacture, compositions, devices, methods, and steps in the specific embodiments described in the specification. Any one of ordinary skill in the art can. The processes, machines, fabrications, compositions, devices, methods, and procedures that are presently or in the future are understood to be used in accordance with the present invention as long as they can perform substantially the same function or achieve substantially the same results in the embodiments described herein. Accordingly, the scope of the invention includes the above-described processes, machines, manufactures, compositions, devices, methods, and steps. In addition, each patent application scope constitutes an individual embodiment, and the scope of protection of the present invention also includes the scope of each patent application. And combinations of the embodiments.

While the invention has been described above in terms of several preferred embodiments, it is not intended to limit the invention. Those skilled in the art having the ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. Therefore, the scope of the invention is defined by the scope of the appended claims. In addition, each patent application scope is constructed as a separate embodiment, and various combinations of patents and combinations of embodiments are within the scope of the invention.

100‧‧‧Upper cover

200‧‧‧ lens holder

210‧‧‧ accommodating space

300‧‧‧ drive coil

400‧‧‧Frame

410‧‧‧Receiving Department

420‧‧‧ Groove

500‧‧‧First magnetic component

600‧‧‧Second magnetic component

700‧‧‧ring loop

800‧‧‧ position detector

810‧‧‧X-axis position detector

820‧‧‧Y-axis position detector

900‧‧‧Base

910‧‧‧ coil plate

920‧‧‧ boards

930‧‧‧Under the cover

E1‧‧‧First elastic element

E11‧‧‧ inner circle

E12‧‧‧ outer circle

E2‧‧‧Second elastic element

E21‧‧‧ inner circle

E22‧‧‧ outer ring segment

Claims (15)

A lens driving module for carrying and moving a lens, comprising: a lens holder having an accommodating space, wherein the lens is disposed in the accommodating space; a driving coil is disposed on the lens holder Surrounding the accommodating space; the plurality of first magnetic elements have an elongated structure, and the lens holder is located between the first magnetic elements; a virtual plane perpendicular to the long axis direction of the elongated structure And the projection of the driving coil and the first magnetic elements along the long axis direction of the elongated structure on the virtual plane overlap each other; and a plurality of second magnetic components, the lens holder is located at the second magnetic Between the components, wherein the lens holder moves in a first direction relative to the first magnetic component and the second magnetic components when a first current flows through the driving coil, wherein the driving coil and the first The distance between the outer side surfaces of a magnetic element is less than the distance between the drive coil and the outer side surface of the second magnetic element. The lens driving module of claim 1, wherein each of the first magnetic elements has a slope facing one of the driving coils. The lens driving module of claim 1, wherein a gap is formed between the two first magnetic elements disposed on one side of the driving coil. The lens driving module of claim 3, wherein the lens regional module further comprises a third magnetic component disposed in the gap. The lens driving module of claim 4, wherein the width of the third magnetic element is smaller than the width of the first magnetic element. The lens driving module of claim 4, wherein the third magnetic element does not protrude from an outer side surface of the first magnetic element. The lens driving module of claim 1, wherein the first magnetic element has a recessed portion, and the driving coil enters the recessed portion. The lens driving module of claim 1, wherein the length of the driving coil is greater than the width of the driving coil. The lens driving module of claim 1, wherein the long axis direction of the elongated structure is perpendicular to the first direction. The lens driving module of claim 1, wherein the lens driving module further comprises: a frame body, the lens holder is received, and the first magnetic component and the second magnetic component are fixed to a first elastic member connecting the lens holder and the frame; and a second elastic member connecting the lens holder and the frame, wherein the lens holder is located at the first elastic member and Between the second elastic elements. The lens driving module of claim 10, wherein the lens driving module further comprises: a base comprising a coil plate; and a plurality of loop wires connecting the coil plate and the first elastic component, Wherein the lens holder is opposite to the second current when flowing through the coil plate The base moves in a second direction, and the first direction is perpendicular to the second direction. The lens driving module of claim 11, wherein the base further comprises a circuit board electrically connected to the coil plate. The lens driving module of claim 11, wherein the lens driving module further comprises at least one position detector disposed on the base. The lens driving module of claim 13, wherein the position detector comprises a Hall effect sensor, a magnetoresistance effect sensor, a giant magnetoresistance effect sensor, and a tunneling magnetoresistance effect Detector, or flux sensor. A lens driving module for carrying and moving a lens, comprising: a base; an upper cover comprising a rectangular structure, wherein the rectangular structure has a long axis and a short axis, and the long axis passes through the lens An optical axis; a plurality of first magnetic units arranged along a first linear direction; a plurality of second magnetic units arranged along a second linear direction, wherein the first linear direction and the second linear direction are parallel to each other and perpendicular to the long axis a lens holder, the lens is disposed on the lens holder; and a driving coil disposed on the lens holder, wherein the first magnetic unit and the second magnetic elements are disposed on both sides of the upper cover And the first magnetic unit and the second magnetic elements are mirror-symmetrical with the long axis as a symmetry axis.