JP2017191315A - Lens drive mechanism and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens drive mechanism having an energization element.SOLUTION: A lens drive mechanism configured to move an optical lens comprises a base having a center axis, a holder which holds the optical lens and is movable to the base, a first elastic member connected to the holder and the base, and a first energization element which is connected to the holder and the base to move the holder and the optical lens to the base, in which an optical axis of the optical lens has an angular displacement with respect to the center axis.SELECTED DRAWING: Figure 2

Description

  This application claims priority to US Provisional Patent Application No. 62/316845, filed on April 1, 2016, and Taiwan Patent Application No. 106102854, filed on January 25, 2017. All of which are incorporated herein by reference.

  The present invention relates to a lens driving mechanism, and more particularly to a lens driving mechanism having a biasing element.

  With the development of technology, recent electronic devices (eg, tablet computers and smartphones) typically include a lens module that can support shooting or recording. However, when the user vibrates the lens module of the electronic device, the image may be blurred. In order to improve image quality, it is increasingly important to design seismic lens modules.

JP 2011-65140 A

  A lens drive mechanism having a biasing element is provided.

  In order to address defects in conventional products, embodiments of the present invention include a lens drive mechanism configured to move an optical lens and including a holder, a base, a first elastic member, and a first biasing element. provide. The optical lens is disposed in the holding space of the holder. The base has a central axis and the holder is movable relative to the base. The first elastic member is connected to the holder and the base. The first biasing element applies a force to the holder, and the optical axis of the optical lens has an angular displacement with respect to the central axis.

  In some embodiments, the first biasing element comprises a shape memory alloy material.

  In some embodiments, the lens drive mechanism is formed on the base by insert molding or 3D molded circuit component technology, and the electrical conductor is electrically connected to the first biasing element.

  In some embodiments, the first biasing element has a first portion and a U-shaped second portion, the first portion being substantially parallel to the central axis and the second portion Connect to the part.

  In some embodiments, the first biasing element further comprises a third portion that is substantially perpendicular to the central axis, and the second portion is coupled to the first portion and the third portion. To do.

  In some embodiments, the second portion and the third portion are disposed on opposite sides of the first portion.

  In some embodiments, the base has a body and at least one protrusion, the protrusion protrudes from the body toward the holder, and the first elastic member is coupled to the protrusion and the holder.

  In some embodiments, the lens drive mechanism further includes a second biasing element and a plate, the second biasing element is coupled to the base and the plate, and the second biasing element is the base and the holder. Is moved relative to the plate.

  In some embodiments, the second biasing element moves the base and holder relative to the plate in a direction substantially perpendicular to the central axis.

  In some embodiments, the second biasing element comprises a shape memory alloy material.

  In some embodiments, the first biasing element and the second biasing element are arranged at different positions along the central axis.

  In some embodiments, the lens driving mechanism further includes a rolling element disposed between the base and the plate.

  In some embodiments, the lens driving mechanism further includes a second elastic member connected to the base and the plate.

  In some embodiments, the lens drive mechanism further includes an image sensor secured to the base.

  In some embodiments, the base is disposed between the holder and the plate, and the image sensor is disposed between the base and the plate.

  Embodiments of the present invention provide a method for controlling a lens drive mechanism, the lens drive mechanism further comprising a plurality of first biasing elements disposed on different sides of the base, the method comprising a plurality of drive A signal is applied to each first biasing element and the holder is moved along the central axis relative to the base.

  Another embodiment of the present invention provides a method for controlling a lens drive mechanism, the lens drive mechanism further comprising a plurality of first biasing elements disposed on different sides of the base, the method comprising: A plurality of drive signals are applied to each first biasing element and the optical axis has an angular displacement with respect to the central axis.

A more complete understanding of the invention can be obtained by considering the following detailed description of various embodiments of the invention in conjunction with the accompanying drawings.
It is the schematic of the lens drive mechanism based on embodiment of this invention. It is an exploded view of the lens drive mechanism of FIG. It is the schematic of the lens drive mechanism in which the housing of FIG. 1 was abbreviate | omitted. It is the schematic of the holder which moves to the direction of an optical axis. It is the schematic of the optical axis which has an angular displacement with respect to a central axis. It is the schematic of the lens drive mechanism based on another embodiment of this invention. It is an exploded view of the lens drive mechanism of FIG. FIG. 7 is a schematic view of a lens driving mechanism in which the housing of FIG. 6 is omitted. It is a top view of the plate of FIG. 8, a 2nd elastic member, a 2nd biasing element, and a rolling element. It is the schematic of the lens drive mechanism based on another embodiment of this invention.

  The manufacture and use of embodiments of the lens drive mechanism are discussed in detail below. However, the present embodiment may be embodied in a manner that adapts in various specific situations. The specific embodiments discussed are merely illustrative of specific aspects of manufacturing and using the package structure and are not intended to limit the scope of the invention.

  Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be construed as having a meaning consistent with that in the context of the relevant technical field. Unless expressly so defined in the specification, it should not be interpreted in an idealized or overly formal sense.

  As shown in FIGS. 1 to 2, FIG. 1 is a schematic view of a lens driving mechanism 1 according to an embodiment of the present invention, and FIG. 2 is an exploded view of the lens driving mechanism of FIG. The lens driving mechanism 1 can be disposed in an electronic device such as a camera, a tablet computer, or a mobile phone, and can be configured such that an optical lens (not shown) is disposed therein. The optical lens can move relative to the image sensor of the electronic device so that the lens driving mechanism 1 has an autofocus function.

  1 to 2, the lens driving mechanism 1 mainly includes a base 10, a holder 20 made of an insulating material, a housing 30, a plurality of first elastic members S1 to S4, and a plurality of first elements. It includes biasing elements W1 to W4 and a plurality of positioning members P1 and P2. The accommodation space 20R penetrates the holder 20, and an optical lens (not shown) can be disposed therein. The image sensor (not shown) is disposed below the base 10 and is configured to receive light from outside the lens driving mechanism 1 and light that has passed through the optical lens. The base 10 has a central axis that matches the optical axis O of the optical lens. The base 10 has a main body 11 and four convex portions 12 formed in a square or a rectangle. The convex portions 12 are arranged at four corners of the main body 11 and protrude from the main body 11 toward the holder 20. As shown in FIG. 3, the holder 20 is disposed on the base 10 and is connected to the four convex portions 12 of the base 10 by four first elastic members S1 to S4 (for example, metal springs). .

  The first biasing elements W <b> 1 to W <b> 4 are connected to the base 10 and the holder 20. The first biasing elements W1-W4 can be made of a shape memory alloy (SMA) material, the length of which can be determined by applying one or more drive signals (eg, current) to them from an external power source. Can be changed. For example, when the drive signal is applied and the first biasing elements W1 to W4 are heated, the first biasing elements W1 to W4 are deformed (for example, extended or shortened). When the application of the drive signal is stopped, the deformed first biasing elements W1 to W4 are restored to their original lengths. In other words, the lengths of the first biasing elements W1 to W4 can be controlled to change the posture of the holder 20 by applying an appropriate drive signal. For example, the first biasing elements W1 to W4 may be made of a titanium nickel (TiNi) alloy, a titanium palladium (TiPd) alloy, a titanium nickel copper (TiNiCu) alloy, a titanium nickel palladium (TiNiPd) alloy, or a combination thereof. it can.

  As shown in FIGS. 2 and 3, FIG. 3 is a schematic diagram of the lens driving mechanism 1 in which the housing 30 of FIG. 1 is omitted. As described above, the holder 20 is connected to the four convex portions 12 of the base 10 by the four first elastic members S <b> 1 to S <b> 4, respectively. They are arranged on different sides and are connected to the holder 20 and the base 10. Specifically, both ends of each first biasing element W1 to W4 are electrically connected to two conductive blocks L, respectively, and the conductive blocks L are fixed to the holder 20 and the base 10 (for example, The conductive block L is fixed by engagement means or adhesion). The first urging elements W1 to W4 can be electrically connected to the corresponding first elastic members S1 to S4 by the respective conductive blocks L.

  As shown in FIG. 3, the lens driving mechanism 1 further includes a plurality of conductors E (for example, conductors) formed on the base 10, and is formed on the base 10 by insert molding or 3D molded circuit component (MID) technology. It is formed. The conductor E is electrically connected to the first elastic members S1 to S4 and the first biasing elements W1 to W4 to form four independent circuits. Thus, drive signals (eg, current) can be applied to them from an external power source, and the length of the first biasing elements W1-W4 can be changed to adjust the orientation of the holder 20. Can do. It should be noted that since the conductor E is formed on the base 10 by insert molding or 3D molded circuit component (MID) technology, the number of components of the lens driving mechanism 1 can be reduced, Its volume can be greatly reduced. In addition, since the first elastic members S1 to S4 are conductive (for example, a metal spring), the first biasing elements W1 to W4 and the conductor E may be electrically connected to each other. This saves space because it does not require additional conductors.

  It should be understood that each first biasing element W1-W4 is electrically independently connected to an external power source. Accordingly, a plurality of different drive signals can be applied to the first biasing elements W1 to W4, respectively, by an external power source, and the first biasing elements W1 to W4 are independently controlled and are different or the same. Has a change in length. For example, when the drive signal is applied to the first urging elements W1 to W4 and the first urging elements W1 to W4 are deformed, the first urging elements W1 to W4 move the holder 20 and the optical lens. It can be moved along the optical axis O with respect to the base 10 or can have an angular displacement with respect to the central axis C of the base 10 for fast optical focus or optical image stabilization (OIS). Achieve function.

  As shown in FIG. 3, the two columnar positioning members P <b> 1 and P <b> 2 are arranged on each side of the main body 11 of the base 10. The first biasing elements W1 to W4 are in contact with the positioning members P1 and P2, and are extended around the positioning members P1 and P2. All the first biasing elements W1 to W4 can be divided into three parts, a first part W11, a second part W12, and a third part W13. The first portion W11 is substantially parallel to the central axis C, and the second portion W12 has a U-shaped structure and is connected to the first portion W11. The third portion W13 is substantially perpendicular to the central axis C, the second portion W12 is connected to the first portion W11 and the third portion W13, and the second portion W12 and the third portion. W13 is arrange | positioned at the left side and the right side of the 1st part W11, respectively. The first biasing elements disposed on each side of the main body 11 when the first biasing elements W1 to W4 extend around the positioning members P1 and P2 to form the three portions W11, W12, and W13. The length of W1-W4 can be increased. Therefore, when the first urging elements W1 to W4 are deformed, more changes in length can be generated. Further, due to the distance between the positioning members P1 and P2 in the direction of the central axis C, a short circuit between the first, second, and third portions W11, W12, and W13 can be avoided.

  Hereinafter, how the holder 20 and the optical lens are moved with respect to the base 10 by controlling the change in the length of the first biasing elements W1 to W4 will be described in detail below. In the present embodiment, as shown in FIG. 4, when the drive signal is applied to the first biasing elements W1 to W4 on the four sides of the main body 11, the length changes are substantially the same. The first biasing elements W1 to W4 can move the holder 20 and the optical lens with respect to the base 10 in the direction of the optical axis O.

  On the other hand, when different driving signals are applied to the first urging elements W1 to W4 and the length changes thereof are different from each other, the optical axis O of the holder 20 and the optical lens is relative to the central axis C of the base 10. Can have a tilted angular displacement θ (as shown in FIG. 5).

  That is, by adding different driving signals to the first urging elements W1 to W4, the length changes can be controlled respectively, and the holder 20 and the optical lens are applied to the base 10 along the optical axis O. The optical axis O can have an angular displacement θ with respect to the central axis C of the base 10, so that the autofocus and optical image stabilization (OIS) of the lens driving mechanism 1 can be performed. make it easier. In another embodiment, the lens driving mechanism 1 has only one first elastic member S1 and one first biasing element W1, and forms a circuit loop with the conductor E and the external power source. . When the drive signal is applied to the first biasing element W1 and the first biasing element W1 is deformed, the optical axis O shifts the angular displacement θ with respect to the central axis C of the base 10, and the lens driving mechanism. A tilt angle compensation of 1 can be achieved.

  Control of the lens driving mechanism 1 including a step of applying a plurality of driving signals to the first biasing elements W1 to W4 and moving the holder 20 and the optical lens in the direction of the optical axis O based on the above-described embodiment. A method is further provided. Alternatively, a plurality of driving signals may be applied to the first biasing elements W <b> 1 to W <b> 4 so that the optical axis O of the optical lens has an angular displacement θ with respect to the central axis C of the base 10.

  6 to 7 are schematic exploded views of the lens driving mechanism 2 according to another embodiment of the present invention. The main difference between the lens driving mechanism 2 of the present embodiment and the lens driving mechanism 1 of the above-described embodiment is that the lens driving mechanism 2 has a plate 40, a plurality of second elastic members SR1 and SR2, and a plurality of second attachments. The same components that further include the force elements WR1 to WR4 and the plurality of rolling elements B and correspond to the above-described embodiment (FIGS. 1 to 5) will not be described again here.

  As shown in FIGS. 7 to 9, the image sensor (not shown) is disposed on the plate 40, the base 10 is disposed on the plate 40, the second elastic members SR1 and SR2, and the second elastic members SR1 and SR2. The biasing elements WR <b> 1 to WR <b> 4 are connected to the plate 40 and the base 10. Specifically, both ends of the second elastic members SR1 and SR2 are connected to the plate 40 and the base 10, respectively. Both ends of the second biasing elements WR1 to WR4 are connected to the plate 40 and the base 10 by conductive blocks L (as shown in FIGS. 8 to 9), and the second biasing elements WR1 to WR4 and the second biasing elements WR1 to WR4 The one urging elements W1 to W4 are arranged at different positions in the direction of the central axis C. When the driving signals from different external power sources are applied to the second urging elements WR1 to WR4, the second urging elements WR1 to WR4 are deformed, and the base 10 and the holder 20 are substantially perpendicular to the optical axis O. Move relative to the plate 40 in the direction Therefore, the displacement between the optical axis O and the central axis C due to the vibration of the lens driving mechanism 2 in the horizontal direction is compensated.

  It should be noted that the rolling element B of the lens driving mechanism 2, such as a ball or a roller, is sandwiched between the plate 40 and the base 10. When the second urging elements WR1 to WR4 expand and contract to move the base 10 and the holder 20 relative to the plate 40, the base 10 and the holder 20 move in the horizontal direction guided by the rolling elements B. Can be led. Therefore, damage to the mechanism due to contact between the plate 40 and the base 10 is effectively avoided.

  FIG. 10 is a schematic view of the lens driving mechanism 3 according to another embodiment of the present invention. The main difference between the lens driving mechanism 3 of this embodiment and the lens driving mechanism 2 of the above-described embodiment is that the plate 40 ′ of the lens driving mechanism 3 does not have an accommodation space for accommodating the image sensor. The plate 40 ′ is fixed to the case of the electronic device, and the image sensor IM is fixed to the back surface 101 of the base 10. Here, the base 10 is located between the holder 20 and the plate 40 ′, and the image sensor IM is located between the base 10 and the plate 40 ′. Accordingly, when the second biasing elements WR1 to WR4 are deformed, the second biasing elements WR1 to WR4 bring the base 10, the holder 20, and the image sensor IM together in a direction substantially perpendicular to the optical axis O. Can be moved to. In other words, the image sensor IM and the optical lens disposed in the holder can move together with respect to the plate 40 ′, and vibration compensation of the lens driving mechanism 2 can be achieved.

  In summary, a lens driving mechanism and a control method thereof are provided. The lens driving mechanism is configured to drive the optical lens and mainly includes a holder, a base, at least one first elastic member, and at least one first biasing element. The first elastic member is connected to the holder and the base. A first biasing element is also coupled to the holder and the base. When a change in the length of the first biasing element occurs, the holder and optical lens move or have an angular displacement relative to the central axis of the base. Therefore, the function of optical focus or optical camera shake correction can be achieved.

  The use of ordinal numbers such as “first”, “second”, “third”, etc. in the specification does not imply a priority, order, or order per se, but rather just two or more. It is used as a label to distinguish features, elements, items, etc. The use of ordinal numbers such as “first”, “second”, “third”, etc. in a claim to change a claim element itself compares one claim element with another claim element. Does not imply priority, order, or order, or time order of actions to perform the method, but rather, simply distinguish one claim element with a particular name to distinguish the claim elements. It is used as a label (and only an ordinal) to distinguish it from other elements it has.

  Although the present invention has been described with reference to the embodiments, those skilled in the art can make various modifications and changes without departing from the spirit and technical scope of the present invention. The embodiments and examples are illustrative only, and the scope of the present invention is defined and protected by the following claims and their equivalents.

1, 2, 3 Lens drive mechanism 10 Base 101 Base back surface 11 Main body 12 Convex part 20 Holder 20R Housing space 30 Housing 40, 40 'Plate B Rolling element C Center axis E Conductor IM Image sensor L Conductive block O Optical axis P1 , P2 Positioning members S1 to S4 First elastic members SR1 and SR2 Second elastic members W1 to W4 First biasing element W11 First portion W12 Second portion W13 Third portion WR1 to WR4 Second Energizing element θ Angular displacement

Claims (17)

A lens driving mechanism configured to move an optical lens,
A base having a central axis,
A holder configured to hold the optical lens and movable relative to the base;
A first elastic member coupled to the holder and the base; and the holder and the optical lens connected to the holder and the base to move the holder and the optical lens relative to the base, and an optical axis of the optical lens is the central axis A lens driving mechanism including a first biasing element having an angular displacement with respect to.   The lens driving mechanism according to claim 1, wherein the first biasing element is made of a shape memory alloy material.   The lens driving mechanism according to claim 1, further comprising a conductor formed on the base by insert molding or 3D molded circuit component technology, wherein the conductor is electrically connected to the first biasing element. .   The first biasing element has a first portion and a U-shaped second portion, wherein the first portion is substantially parallel to the central axis, and the second portion The lens driving mechanism according to claim 1, which is coupled.   The first biasing element further comprises a third portion that is substantially perpendicular to the central axis, and the second portion is coupled to the first portion and the third portion. Item 5. The lens driving mechanism according to Item 4.   The lens driving mechanism according to claim 5, wherein the second part and the third part are disposed on the opposite side of the first part.   The base has a main body and at least one convex portion, the convex portion protrudes from the main body toward the holder, and the first elastic member is connected to the convex portion and the holder. The lens drive mechanism described in 1.   The lens driving mechanism further includes a second urging element and a plate, the second urging element is coupled to the base and the plate, and the second urging element includes the base and the holder. The lens driving mechanism according to claim 1, wherein the lens is moved relative to the plate.   The lens driving mechanism according to claim 8, wherein the second urging element moves the base and the holder with respect to the plate in a direction substantially perpendicular to the central axis.   The lens driving mechanism according to claim 8, wherein the second biasing element is made of a shape memory alloy material.   The lens driving mechanism according to claim 8, wherein the first biasing element and the second biasing element are arranged at different positions along the central axis.   The lens driving mechanism according to claim 8, wherein the lens driving mechanism further includes a rolling element disposed between the base and the plate.   The lens driving mechanism according to claim 8, further comprising a second elastic member connected to the base and the plate.   The lens driving mechanism according to claim 8, wherein the lens driving mechanism further includes an image sensor fixed to the base.   The lens driving mechanism according to claim 14, wherein the base is disposed between the holder and the plate, and the image sensor is disposed between the base and the plate. The method of controlling a lens driving mechanism as recited in claim 1, wherein the lens driving mechanism further comprises a plurality of first biasing elements disposed on different sides of the base, the method comprising:
Applying a plurality of drive signals to each first biasing element and moving the holder relative to the base along the central axis; The method of controlling a lens driving mechanism as recited in claim 1, wherein the lens driving mechanism further comprises a plurality of first biasing elements disposed on different sides of the base, the method comprising:
A method of applying a plurality of drive signals to each first biasing element to control a lens drive mechanism in which the optical axis has an angular displacement with respect to the central axis.

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