Actuator for camera, camera module and imaging apparatus
The actuator design for camera modules addresses the challenge of achieving high power output and easy assembly by using a support member with abutting portions to maintain magnet distance, allowing for efficient assembly of Halbach array magnets within a compact actuator.
Patent Information
- Application Number
- PCT/CN2023/118937
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2023-09-15
- Publication Date
- 2025-03-20
AI Technical Summary
Existing voice coil motor (VCM) actuators for camera modules face challenges in achieving high power output without increasing the size of the actuator, and also struggle with difficult assembly due to attraction and repulsion forces between magnets in arrays like the Halbach array.
The proposed actuator design includes a support member with abutting portions that maintain the distance between magnets, facilitating assembly by preventing attraction forces from misaligning the magnets. This design allows for the arrangement of magnets in a Halbach array without increasing the actuator's size.
The solution enables the assembly of high-thrust VCM actuators with improved ease and efficiency, maintaining the compact size while enhancing the output capabilities, thus addressing the limitations of existing technologies.
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Figure CN2023118937_20032025_PF_FP_ABST
Abstract
Description
ACTUATOR FOR CAMERA, CAMERA MODULE AND IMAGING APPARATUSTECHNICAL FIELD
[0001] The present disclosure relates to an actuator for a camera, and more particularly to an actuator for driving a camera module, an optical system or an imaging sensor for use in an autofocus function or an optical image stabilization function, and the camera module and an imaging apparatus having the actuator.BACKGROUND
[0002] In recent years, imaging sensors and lenses have become larger in many of camera modules installed in portable devices such as smartphones and tablet PCs, or in other cameras. Accordingly, weight of optical members to be driven for autofocus and optical image stabilization is increasing. High power is desirable for the actuator to drive the weighted optical members.
[0003] As an actuator for autofocus and optical image stabilization, a voice coil motor (VCM) is widely used. The VCM is mainly composed of a magnet, a coil and a yoke. It is a single-phase motor that uses a magnetic field generated by flowing direct current (DC) to perform positioning. The VCM is characterized by light weight and fast response speed. However, in order to make the VCM high power, it is necessary to increase size of the magnet or coil, and as a result, size of a camera module will increase. Therefore, it is desirable to have an actuator capable of higher output without increasing the size of the actuator.
[0004] As a method of making the VCM high power without changing the size of the magnet or coil, it is known to use magnets to form an array such as a Halbach array. However, this method is difficult to assemble the actuator because of attraction and repulsion forces between the magnets when arranging them. Therefore, it is desirable to facilitate assembly in actuators capable of higher output without increasing the size of the actuator.SUMMARY
[0005] The present invention is to facilitate the assembly of a high thrust VCM actuator.
[0006] According to the first aspect of the present disclosure, there is provided an actuator for camera, comprising:
[0007] a plurality of magnets arranged;
[0008] a fixing part;
[0009] a movable part movable relative to the fixing part; and
[0010] a coil,
[0011] wherein one of the fixing part and the movable part is a support member that supports the plurality of magnets, wherein the coil is supported by the other of the fixed portion and the movable portion so as to face the plurality of magnets, wherein the plurality of magnets has two magnets having poles on surfaces opposite the coil, and wherein the support member has abutting portions that abut ends of opposing surfaces of the two magnets.
[0012] According to the first aspect, in order to assemble the arranged magnets, two or more magnets having different polarities on surfaces facing the coil are initially inserted into the support member. At this time, by the support member having abutting portions between the magnets, it is possible to maintain the distance between the magnets even if attracting forces act on each other.
[0013] According to the second aspect of the present disclosure, there is provided an actuator for camera, comprising:
[0014] a plurality of magnets arranged;
[0015] a fixing part; and
[0016] a movable part movable relative to the fixing part; and
[0017] a coil,
[0018] wherein one of the fixing part and the movable part is a support member that supports the plurality of magnets, wherein the coil is supported by the other of the fixed portion and the movable portion so as to face the plurality of magnets, wherein the plurality of magnets has at least one magnet that is magnetized in an array direction of the plurality of magnets, and wherein the support member has abutting portions that abut ends of two sides of the at least one magnet perpendicular to the array direction.
[0019] According to the second aspect, a magnet that is magnetized in the array direction is first inserted to assemble the arrayed magnets. Thereafter, the plurality of magnets whose surfaces opposite the coil are N or S poles are inserted into the support member. The support member has abutting portions on both sides of the magnet that is magnetized in the array direction. Thus, the position of the magnet inserted first can be maintained, which facilitates the subsequent insertion of the magnets.
[0020] According to a possible implementation of the first or second aspect, the plurality of magnets is arranged in a Halbach array.
[0021] According to this implementation, the magnets arranged in the Halbach array can be easily inserted into the support member.
[0022] According to a possible implementation of the first or second aspect, an interval between two of the abutting portions is greater than or equal to width of a magnet inserted between two of the plurality of magnets.
[0023] According to this implementation, the interval of the abutting portions is larger than the width of the magnet magnetized in the array direction, making it easier to insert the magnet into the support member.
[0024] According to a possible implementation of the first or second aspect, the support member is provided with a magnetic substance on a surface of the plurality of magnets opposite to the other surface of the magnets opposite the coil.
[0025] According to this implementation, when the magnet is inserted into the support member, it is attracted to the magnetic substance such that it can be easily inserted into the support member.
[0026] According to a possible implementation of the first or second aspect, the support member has a member that abuts outermost in an array direction of the plurality of magnets.
[0027] According to this implementation, when inserting the plurality of magnets into the support member in order, the previously inserted magnet can be suppressed from rotating, and the subsequent magnet can be easily inserted into the support member.
[0028] According to a possible implementation of the first or second aspect, the abutting portion consists of a resin.
[0029] According to this implementation, an actuator using a support member consisting of a resin can be configured.
[0030] According to a possible implementation of the first or second aspect, the abutting portion consists of metal.
[0031] According to this implementation, an actuator using a support member consisting of metal can be configured.
[0032] According to a possible implementation of the first aspect, two of the plurality of magnets are non-adjacent magnets having different polarities on surfaces opposite the coil.
[0033] According to this implementation, in order to assemble the arranged magnets, non-adjacent magnets having different polarities on surfaces opposing the coil are initially inserted into the support member. At this time, by the support member having abutting portions between the magnets, it is possible to maintain the distance between the magnets even if attracting forces of the magnets act on each other.
[0034] According to the third aspect of the present disclosure, there is provided an actuator camera, comprising:
[0035] a coil;
[0036] a plurality of magnets magnetized at a predetermined angle relative to a direction perpendicular to a surface opposite the coil;
[0037] a fixing part; and
[0038] a movable part movable relative to the fixing part,
[0039] wherein one of the fixing part and the movable part is a support member that supports the plurality of magnets, wherein the coil is supported by the other of the fixed portion and the movable portion so as to face the plurality of magnets, and wherein the support member has abutting portions that abut ends of a pair of non-adjacent magnets, and wherein the pair of non-adjacent magnets has different polarities on surfaces facing the coil.
[0040] According to this aspect, a pair of non-adjacent magnets having different polarities on surfaces facing the coil is initially inserted into the support member. The remaining magnets are then inserted into the support member so as to be adjacent to the pair of magnets. In this case, since the support member has the abutting portions, the position of the previously inserted pair of magnets can be maintained. Thus, insertion of the magnets are facilitated.
[0041] According to a possible implementation of the third aspect, an interval between two of the abutting portions is greater than or equal to width of a pair of adjacent magnets having different polarities on surfaces facing the coil.
[0042] According to a possible implementation of the third aspect, the support member is provided with a magnetic substance on a surface of the plurality of magnets opposite to the other face of the magnets opposite the coil.
[0043] According to a possible implementation of the third aspect, the support member has a member that abuts an end of the plurality of magnets in an array direction.
[0044] According to a possible implementation of the third aspect, the abutting portion consists of a resin.
[0045] According to a possible implementation of the third aspect, the abutting portion consists of metal.
[0046] According to the fourth aspect of the present disclosure, there is provided an actuator camera, comprising:
[0047] a coil;
[0048] a plurality of magnets magnetized at a predetermined angle relative to a direction perpendicular to a surface opposite the coil;
[0049] a fixing part; and
[0050] a movable part movable relative to the fixing part,
[0051] wherein one of the fixing part and the movable part is a support member that supports the plurality of magnets, wherein the coil is supported by the other of the fixed portion and the movable portion so as to face the plurality of magnets, and wherein the support member has abutting portions that abut ends of a pair of adjacent magnets, and wherein the pair of adjacent magnets has different polarities on surfaces facing the coil.
[0052] According to this aspect, a pair of adjacent magnets having different polarities on surfaces facing the coil is initially inserted into the support member. The remaining magnets are then inserted into the support member so as to be adjacent to the pair of magnets. In this case, since the support member has the abutting portions, the position of the previously inserted pair of magnets can be maintained. Thus, insertion of the magnets are facilitated.
[0053] According to a possible implementation of the fourth aspect, an interval between two of the abutting portions is greater than or equal to width of the pair of adjacent magnets.
[0054] According to a possible implementation of the fourth aspect, the support member is provided with a magnetic substance on a surface of the plurality of magnets opposite to the other surface of the magnets opposite the coil.
[0055] According to a possible implementation of the fourth aspect, the support member has a member that abuts an end of the plurality of magnets in an array direction.
[0056] According to a possible implementation of the fourth aspect, the abutting portion consists of a resin.
[0057] According to a possible implementation of the fourth aspect, the abutting portion consists of metal.
[0058] According to a possible implementation of any one of the first to fourth aspects, the magnet that does not abut the abutting portion has a notch at an end thereof, wherein the support member has an engaging portion that engages with the notch, and the abutting portion is provided in the engaging portion.
[0059] According to this implementation, since the magnets have the abutting portions, the distance between the magnets can be maintained even if they are attracted to each other.
[0060] According to the fifth aspect, there is provided a camera module having an actuator for a camera as described above.
[0061] According to the sixth aspect, there is provided an imaging apparatus having an actuator for a camera as described above.BRIEF DESCRIPTION OF DRAWINGS
[0062] To describe the technical solutions in the embodiments more clearly, the following briefly describes the accompanying drawings required for describing the present embodiments. Apparently, the accompanying drawings in the following description depict merely some of the possible embodiments, and a person of ordinary skill in the art may still derive other drawings, without creative efforts, from these accompanying drawings, in which:
[0063] FIG. 1 illustrates a basic configuration of a camera module to which an actuator according to an embodiment is applied.
[0064] FIG. 2 illustrates an exploded perspective view of an actuator according to an embodiment;
[0065] FIG. 3 illustrates a side cross-sectional view of an actuator according to an embodiment.
[0066] FIG. 4 is a diagram to illustrate an array of magnets, in which (a) illustrates magnetic field lines of force formed by an array of conventional magnets, and (b) illustrates magnetic field lines of force formed by magnets arranged in a Halbach array;
[0067] FIG. 5A illustrates a cross-sectional view of an example actuator;
[0068] FIG. 5B illustrates a cross-sectional view of an example actuator;
[0069] FIG. 5C illustrates a cross-sectional view of an example actuator;
[0070] FIG. 6 is a top view of an fixing part and magnets according to an embodiment, in which (a) illustrates a top view including the entire magnets, and (b) illustrates an enlarged view of a portion of (a) ;
[0071] FIG. 7 is a diagram illustrating a procedure for inserting magnets into a fixing part;
[0072] FIG. 8 is a diagram illustrating a relationship between an interval between two abutting portions provided in a fixing part and width of a central magnet;
[0073] FIG. 9 is a diagram illustrating operation of a magnetic substance embedded in a fixing part, in which (a) illustrates a status where two magnets are inserted into the fixing part, and (b) illustrates insertion of a central magnet;
[0074] FIG. 10 is a diagram illustrating operation of side support parts included in a fixing part;
[0075] FIG. 11 is a diagram illustrating an example of a form of a fixing part used for an actuator, in which (a) illustrates an exterior perspective view, and (b) illustrates a perspective view of a fixing part in which magnets are mounted;
[0076] FIG. 12 illustrates an exploded perspective view of an actuator according to an embodiment;
[0077] FIG. 13 illustrates a top view of a portion of the fixing part of the actuator;
[0078] FIG. 14 is a diagram illustrating a procedure for inserting magnets into a fixing part;
[0079] FIG. 15 illustrates a diagram illustrating a relationship between an interval of two abutting portions provided in a fixing part and width of a central magnet;
[0080] FIG. 16 is a diagram illustrating operation of a magnetic substance embedded in a fixing part, in which (a) illustrates a status where a central magnet is inserted and (b) illustrates insertion of two magnets;
[0081] FIG. 17 is a diagram illustrating operation of side support members included in a fixing part;
[0082] FIG. 18 is a diagram illustrating an example of a form of a fixing part, in which (a) illustrates an exterior perspective view, and (b) illustrates a perspective view of the fixing part in which magnets are mounted;
[0083] FIG. 19 illustrates an exploded perspective view of an actuator according to an embodiment;
[0084] FIG. 20 illustrates a side cross-sectional view of an actuator according to an embodiment;
[0085] FIG. 21 illustrates a top view of an fixing part and magnet according to an embodiment, in which (a) illustrates a top view including the entire magnets, and (b) illustrates an enlarged view of a portion of (a) ;
[0086] FIG. 22 is a diagram illustrating a procedure for inserting a magnet into a fixing part.
[0087] FIG. 23 illustrates a diagram illustrating a relationship between an interval of two abutting portions provided in a fixing part and width of central magnets.
[0088] FIG. 24 is a diagram illustrating operation of a magnetic substance embedded in a fixing part, in which (a) illustrates a pair of central magnets is inserted and (b) illustrates insertion of the remaining two magnets;
[0089] FIG. 25 is a diagram illustrating operation of side support parts included in a fixing part;
[0090] FIG. 26 is a diagram illustrating an example of a form of a fixing part, in which (a) illustrates an exterior perspective view, and (b) illustrates a perspective view of the fixing part in which magnets are mounted;
[0091] FIG. 27 illustrates an exploded perspective view of an actuator according to an embodiment;
[0092] FIG. 28 illustrates a top view of an fixing part and magnet according to an embodiment, in which (a) illustrates a top view including the entire magnets, and (b) illustrates an enlarged view of a portion of (a) ;
[0093] FIG. 29 is a diagram illustrating a procedure for inserting magnets into a fixing part;
[0094] FIG. 30 is a diagram illustrating a relationship between an interval of two abutting portions provided in a fixing part and width of central magnets;
[0095] FIG. 31 is a diagram illustrating operation of a magnet substance embedded in a fixing part, in which (a) illustrates a pair of central magnets is inserted and (b) illustrates insertion of the remaining two magnets;
[0096] FIG. 32 is a diagram illustrating operation of side support parts included in a fixing part;
[0097] FIG. 33 is a diagram illustrating an example of a form of a fixing part, in which (a) illustrates an exterior perspective view, and (b) illustrates a perspective view of the fixing part in which magnets are mounted;
[0098] FIG. 34 is a diagram illustrating a fixing part according to an embodiment, in which (a) illustrates a top view of a portion in which ends of magnets are fitted, (b) illustrates a top view including magnets, and (c) illustrates a cross-sectional view in a line AA;
[0099] FIG. 35 is a diagram illustrating a fixing part according to an embodiment, in which (a) illustrates a top view of a portion in which ends of magnets are fitted, (b) illustrates a top view including magnets, (c) illustrates a cross-sectional view in a line AA, and (d) and (e) illustrate ends of magnets;
[0100] FIG. 36 is a diagram illustrating a fixing part according to an embodiment, in which (a) illustrates a top view of a portion in which ends of magnets are fitted, (b) illustrates a top view including magnets, and (c) illustrates a cross-sectional view in a line AA; and
[0101] FIG. 37 is a diagram illustrating a fixing part according to an embodiment, in which (a) illustrates a top view of a portion in which ends of magnets are fitted, (b) illustrates a top view including magnets, (c) illustrates a cross-sectional view in a line AA, and (d) and (e) illustrate ends of magnets.DESCRIPTION OF EMBODIMENTS
[0102] To make persons skilled in the art understand the technical solutions in the present disclosure better, the following clearly and completely describes the technical solutions in the embodiments of the present disclosure with reference to the accompanying drawings in the modes of the present disclosure. Apparently, the described embodiments are merely a part rather than all of the embodiments of the present disclosure. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present disclosure without creative efforts shall fall within the protection scope of the present disclosure.
[0103] FIG. 1 is a diagram illustrating a basic configuration of a camera module to which an actuator according to an embodiment of the present disclosure is applied. Although the following describes a module tilt-OIS system that moves or rotates a camera module, the present disclosure is also applicable to a lens shift system that moves a lens and a sensor shift system that moves an imaging sensor.
[0104] A camera module 100 is mounted on an imaging apparatus that includes a portable device, such as a smartphone or tablet PC, or other camera.
[0105] The camera module 100 is movably supported relative to the body of the imaging apparatus. The camera module 100 is independently movable in the X-axis direction (a direction perpendicular to a paper surface) and the Y-axis direction (a longitudinal direction of the drawing) , respectively.
[0106] The camera module 100 includes a lens 102, an image sensor 110, an actuator 104, a control unit 106, a position detector 108, an analog front end (AFE) 112, and a motion sensor 120.
[0107] The lens 102 is provided on an incident light path of the image sensor 110 to direct a subject light to the image sensor 110. The lens 102 is retained by a lens holder 103. The lens holder 103 is movably configured in the Z-axis direction (optical axis direction) .
[0108] The image sensor 110 is composed of an imaging sensor that photoelectrically converts the subject light to output a signal pertaining to the captured image. For example, the image sensor 110 may be a Complementary Metal Oxide Semiconductor (CMOS) sensor. The AFE 112 converts an analog signal output from the image sensor 110 into a digital signal and outputs it to the control unit 106. The actuator 104 is a VCM actuator that is configured to move the camera module 100 and the lens holder 103. As described above, the camera module 100 is independently movable in the X-axis and Y-axis directions, and thus the actuator 104 is configured to independently move the camera module 100 in the X-axis and Y-axis directions to perform optical image stabilization. The actuator 104 is also configured to move the lens 102 in the Z-axis direction for autofocus.
[0109] The motion sensor 120 is configured to detect motion of the camera module 100. For example, the motion sensor 120 may be a gyro sensor. The motion sensor 120 outputs a motion signal that indicates motion of the detected camera module 100.
[0110] The position detector 108 is for positioning the camera module 100. The position detection unit 108 may employ a magnetic detection element such as a Hall sensor, for example. In this case, the magnetic detection element outputs a position detection signal indicating a displacement of the camera module 100.
[0111] The control unit 106 has an actuator driver 114, an image processing circuit 116, and an encoder 118. The actuator driver 114 controls the actuator 104 to move an optical member. The optical member to be moved may include the camera module 100, lens holder 103, image sensor 110, and the like.
[0112] The actuator driver 114 sends a signal to the actuator 104 to perform optical image stabilization. The actuator driver 114 controls motion of the camera module 100 based on the motion signal from the motion sensor 120. For example, when a gyro sensor is used as the motion sensor 120, the motion signal indicates an angular velocity in the yaw direction (X-axis direction) and an angular velocity in the pitch direction (Y-axis direction) . The actuator driver 114 calculates the displacement of the angle by integrating the motion signals for the yaw direction and the pitch direction, respectively. The actuator driver 114 then displaces the camera module 100 in response to the calculated angular displacement.
[0113] Also, in autofocus, the actuator driver 114 may control movement of the lens 102 in response to the contrast of the image output from the image processing circuit 116. For example, the actuator driver 114 controls the actuator 104 to move the lens 102 in the optical axis direction (Z-axis direction) to maximize the contrast of the image output from the image processing circuit 116.
[0114] The image processing circuit 116 performs a predetermined process on the signal output by the AFE 112 to output an image signal in digital format. The encoder converts the output image data in digital format into output image data in analog format. The output image data is transmitted to a display 122. The display 122 displays an image based on an image signal received from the encoder 118, and it may be a liquid crystal display (LCD) , for example.
[0115] In the present embodiment, an optical image stabilization system is applied to the camera module 100 as shown in FIG. 1, but the camera module 100 may be adaptively designed depending on the object to be corrected. For example, if a lens-shifting optical image stabilization system that moves the lens is applied to the camera module 100, the lens 102 is movably supported in the X direction and the Y direction. The position detector 108 detects the position of the lens 102 and the motion sensor 120 detects the movement of the lens 102. In addition, when a sensor-shift optical image stabization system that moves the image sensor is applied to the camera module 100, the image sensor 110 is movably supported in the X direction and the Y direction. The position detection unit 108 detects the position of the image sensor 110, and the motion sensor 120 detects the motion of the image sensor 110.
[0116] (First Embodiment)
[0117] Referring now to FIGS. 2 and 3, a configuration of the actuator 104 according to the first embodiment of the present disclosure will be described.
[0118] FIG. 2 is an exploded perspective view of the actuator 104, and FIG. 3 is a side cross-sectional view of the actuator 104. The actuator 104 includes a fixing part 205, a magnetic substance 206, magnets 204a, 204b, 204c, a coil 203, and a movable part 202. The fixing part 205 is a support member that supports the magnets 204a-204c. The fixing part 205 consists of a resin such as super-engineering plastic or liquid crystal polymer, and is formed in a plate shape. The fixing part 205 has an opening 208 in the center, into which the magnets 204a-204c fit. The movable part 202 consists of a resin such as super-engineering plastic or liquid crystal polymer, and is formed in a plate shape. The coil 203 is secured at the bottom of the movable part 202.
[0119] The magnetic substance 206 is embedded in the fixing part 205. The magnetic substance 206 consists of iron or the like and is exposed at the opening 208.
[0120] In the present embodiment, the member to which the magnet is attached is a fixed part, and the member to which the coil is attached is a movable part. On the contrary, the member to which the magnet is attached may be the movable part, and the member to which the coil is attached may be the fixed part.
[0121] Arrangement of magnets used in the present embodiment will now be described with reference to FIG. 4. FIG. 4 (a) shows magnetic field lines of force formed by a conventional array of two magnets. In FIG. 4 (a) , the magnet on the left has its north (N) pole on the top and the magnet on the right has its N-pole on the bottom. In such an array of magnets, the magnetic field extends symmetrically to both the upper and lower sides, as indicated by arrow F1.
[0122] On the other hand, magnets 204a-204c are arranged in a Halbach array. In the Halbach array, the N and south (S) poles of the magnets are arranged side by side with a 90-degree change in orientation. FIG. 4 (b) shows the magnetic field lines of force formed by magnets arranged in the Halbach array. The left magnet has the N-pole on the upper side, the middle magnet has the N-pole on the left side, and the right magnet has the N-pole on the lower side. By arranging the magnets in this way, the magnetic field can be concentrated on the upper side of the magnets and the magnetic force can be strengthened, as shown by arrow F2. Thus, when the magnets 204a-204c of the actuator 104 are arranged in the Halbach array as shown in FIG. 3, the output of the actuator 104 can be increased by positioning the coil 203 opposite to the upper surfaces of the magnets.
[0123] Some example implementations of the actuator will now be described with reference to FIGS 5A to 5C.
[0124] FIG. 5A is a cross-sectional view of an example actuator implementing an optical image stabilization function. The camera module 100 is secured to the movable part 202 such that the direction from the magnets 204a-204c toward the coil 203 is parallel to the direction of the optical axis of the lens 102. In some embodiments, a housing of the camera module 100 may be formed integrally with the movable part 202. The movable part 202 is held in the body of the imaging apparatus such that it can move parallel to the surface of the coil 203. The position detector 108 may be disposed, for example, inside the coil 203. The position detection unit 108 detects the position of the camera module 100 and outputs it to the actuator driver 114.
[0125] The actuator driver 114 is a control part configured to move the movable part 202 relative to the fixed part 205 by supplying power to the coil 203. The actuator driver 114 controls the current flowing to the coil 203 based on the motion signal from the motion sensor 120 and the position signal of the camera module 100 output from the position detector 108. When the current flows into the coil 203 and the coil 203 generates a magnetic field, the coil 203 exerts a force between the oppositely placed magnets 204a-204c. This force causes the movable part 202 to move in a plane parallel to the fixed part 205.
[0126] FIG. 5B is a cross-sectional view of an example actuator implementing an autofocus function. The lens holder 103 is secured to the movable part 202 such that the direction from the magnets 204a-204c to the coil 203 is perpendicular to the optical axis direction of the lens 102. In some embodiments, the lens holder 103 may be formed integrally with the movable part 202. Upon receiving the image signal output from the image processing circuit 116, the actuator driver 114 generates an amount of movement of the lens 102 according to the contrast of the generated image. Further, the actuator driver 114 controls the current flowing to the coil 203 based on the amount of movement of the lens 102 and the position signal of the lens 102 output from the position detector 108.
[0127] FIG. 5C is a cross-sectional view of another example actuator implementing the optical image stabilization function. The image sensor 110 is secured to the movable part 202 such that the direction from the magnets 204a-204c to the coil 203 is perpendicular to the light-receiving surface of the image sensor 110. The position detection unit 108 detects the position of the image sensor 110 and outputs it to the actuator driver 114. The actuator driver 114 controls the current flowing to the coil 203 based on the motion signal from the motion sensor 120 and the position signal of the image sensor 110 output from the position detector 108.
[0128] Referring again to FIG. 4 (b) , in the Halbach array, the left magnet and the central magnet are in contact with the N-pole, and the right magnet and the central magnet are in contact with the S-pole. Thus, it is difficult to assemble the Halbach array because a repulsive force is generated between adjacent magnets. Accordingly, the present embodiment provides a VCM actuator that is easy to assemble with high thrust without increasing the size of the magnet or coil.
[0129] FIG. 6 shows a top view of the fixing part and the magnet according to the present embodiment, in which (a) shows a top view including the entire magnets and (b) shows an enlarged view of the ends of the magnets. The magnet 204a has the N-pole on the top surface (i.e., the surface facing the coil 203) and the magnet 204c has the S-pole on the top surface. The magnet 204b also has the N-pole on the left side and the S-pole on the right side. The magnet 204b is slightly shorter in length than the magnets 204a, 204c. The fixing part 205 which is a support member has abutting portions C1, C2 that abut against the end of the surface where the two magnets 204a, 204c meet. Although FIG. 6 shows only the abutting portions that abut one end of the magnets 204a, 204c, the fixing part 205 also has other abutting portions that abut the other ends as well.
[0130] Referring to FIG. 7, a method of inserting magnets 204a-204c into the fixing part 205 will be described. First, as shown in (a) , the fixing part 205 is provided such that the opening 208 faces upward. Two magnets 204a, 204c are then inserted as shown in (b) . Here, an attraction force acts on the inserted magnets 204a, 204c. However, since the abutting portions C1, C2 are present in the fixing part 205 as shown in (c) , the magnets 204a, 204c are prevented from attracting. The magnet 204b is then inserted between the magnets 204a, 204c as shown in (d) . When inserting the magnet 204b, it is preferable to position the guiding members 702a, 702b to guide insertion of the magnet 204b. The guiding members 702a, 702b are formed of a resin or the like and are arranged to hold down the two magnets 204a, 204c from above. In this way, the magnets 204a, 204c can be prevented from rotating by attraction or repulsion as the magnet 204b approaches them.
[0131] According to the present embodiment, two or more magnets 204a, 204c having different polarities on surfaces facing the coil 203 are initially inserted into the support member to assemble the magnets in the Halbach array. At this time, the fixing part 205 has abutting portions C1 and C2 between the magnets, such that the distance between the magnets can be maintained even if the magnets are subjected to attraction forces. Also, it becomes easy to insert the magnet 204b magnetized in the array direction between the magnets 204a, 204c. In addition, when inserting the magnet 204b magnetized in the array direction, a surface side of the previously inserted magnets 204a, 204c facing the coil 203 is pressed by a jig or the like. Thus, insertion of the magnet 204b magnetized in the array direction becomes easier.
[0132] FIG. 8 is a diagram illustrating a relationship between an interval between the two abutting portions provided in the fixing part 205 and width of the central magnet 204b. Since the fixing part 205 is provided with two abutting portions C1, C2, it is formed into a convex shape. The interval A between the two abutting portions C1, C2 is greater than or equal to the width B of the magnet 204b inserted between the two magnets 204a, 204c. Creating the interval between the magnets 204a, 204c in this way facilitates the insertion of the magnet 204b between the magnets 204a, 204b as shown in FIG. 7 (d) .
[0133] FIG. 9 is a diagram illustrating operation of the magnetic substance 206 embedded in the fixing part 205. The magnetic substance 206 is exposed at the opening 208. As shown in (a) , when the magnets 204a, 204c are inserted into the opening 208, the magnets 204a, 204c are attracted in the direction of arrows. Thus, the magnets 204a, 204c can be easily inserted into the opening 208. Also, as shown in (b) , when the magnet 204b is inserted into the opening 208, the magnet 204b is attracted in the direction of the arrow. Thus, the magnet 204b can be easily inserted into the opening 208.
[0134] FIG. 10 shows a cross-sectional view of the fixing part 205. The fixing part 205 has side support parts 205a, 205b that abut outermost in the array direction of the plurality of magnets 204a, 204b, 204c. As shown in FIG. 10, with the two magnets 204a, 204c disposed in the fixing part 205, when the magnet 204b is approached from above, the N-pole of the magnet 204a and the N-pole of the magnet 204b are repulsed, and the force that rotates the magnet 204a counter-clockwise as shown by the arrow A1 acts. Also, the S-pole of the magnet 204b and the S-pole of the magnet 204c are repulsed, and the force of rotation of the magnet 204c clockwise as indicated by the arrow A2 acts. Therefore, by providing the side support parts 205a, 205b, it is possible to prevent the rotation of the magnets 204a and 204c fitted in the fixing part 205.
[0135] Referring now to FIG. 11, another form of the fixing part used in the actuator 104 will be described. The fixing part 1105 shown in FIG. 11 (a) may be composed of metal, preferably a magnetic substance such as iron. The fixing part 1105 includes a plate-like member 1106 and magnet support parts 1102a, 1102b, 1102c, 1102d, 1102e, 1102f.
[0136] FIG. 11 (b) shows the fixing part 1105 with the magnets 204a-204c mounted therein. The magnet support parts 1102a, 1102b, 1102d, 1102e serve as side support parts that support the outermost of the array direction of the magnets 204a, 204b, 204c. The magnet support part 1102c supports the central magnet 204b and has abutting portions C3, C4 that abut ends of surfaces of the two magnets 204a, 204c facing each other. Furthermore, the magnet support part 1102f supports the central magnet 204b and has abutting portions C1, C2 that abut ends of surfaces of the two magnets 204a, 204c facing each other. In this way, the size of the fixing part can be reduced by configuring the fixing part 1105 consisting of metal.
[0137] (Second Embodiment)
[0138] Referring now to FIGS. 12 and 13, a configuration of an actuator according to the second embodiment of the present disclosure will be described.
[0139] FIG. 12 is an exploded perspective view of an actuator 1214, and FIG. 13 is a top view of a portion of the fixing part of the actuator 1214. The actuator 1214 can be used in place of the actuator 104 of FIG. 1. The actuator 1214 includes a fixing part 1205, the magnetic substance 206, magnets 1204a, 1204b, 1204c, the coil 203, and the movable part 202. The fixing part 1205 is a support member that supports the magnets 1204a-1204c. The fixing part 1205 has an opening 1208 in the center in which the magnets 1204a-1204c are fitted.
[0140] The magnets 1204a-1204c are arranged in the Halbach array. In the Halbach array shown in FIG. 13, three magnets are arranged. The left magnet 1204a has the N-pole on the upper side, the middle magnet 1204b has the N-pole on the left side, and the right magnet 1204c has the N-pole on the lower side. The magnet 1204b is a magnet that is magnetized in the array direction of the three magnets and is slightly longer than the magnets 1204a, 1204c. The fixing part 1205 which is the support member has abutting portions C11, C12 that abut the ends of the two sides of one magnet 1204b that are perpendicular to the array direction of the magnet 1204b.
[0141] Referring to FIG. 14, a method of inserting the magnets 1204a-1204c into the fixing part 1205 will be described. First, as shown in (a) , the fixing part 1205 is provided such that the opening 1208 faces upward. The magnet 1204b is then inserted as shown in (b) . Here, the magnet 1204b is fixed because the abutting portions C11, C12 are present in the fixing part 205 as shown in (c) . The magnets 1204a, 1204c are then inserted on both sides of the magnet 1204b as shown in (d) . When inserting the magnets 1204a, 1204c, it is preferable to position the guiding member 1402 to guide insertion of the magnets 1204a, 1204c. The guiding member 1402 is formed of a resin or the like and is arranged to hold down the magnet 1204b from above. In this way, the magnets 1204a, 1204c can be prevented from rotating by the attraction or repulsion force as they approaches the magnet 204b.
[0142] FIG. 15 is a diagram illustrating a relationship between an interval between the two abutting portions provided in the fixing part 1205 and width of the central magnet 1204b. Since the fixing part 1205 is provided with two abutting portions C11, C12, it is formed in a concave shape. The interval A between the two abutting portions C11, C12 is greater than or equal to the width B of the magnet 1204b. Creating a gap between the magnets in this way facilitates the insertion of the magnet 1204b into the fixing part 1205 as shown in FIG. 14 (d) .
[0143] According to this embodiment, the magnet 1204b that is magnetized in the array direction is first inserted to assemble the magnets in the Halbach array. Thereafter, the magnets 1204a, 1204c whose surfaces opposite the coil 203 are the N or S poles are inserted. Since the fixing part 1205 has the abutting portions C11, C12 on both sides of the magnet 1204b that is magnetized in the array direction, the position of the magnet 1204b can be maintained. Thus, inserting the magnets 1204a, 1204c becomes easier. In addition, when inserting the magnets 1204a, 1204c whose surfaces opposite the coil 203 are N or S poles, the surface of the previously inserted magnet 1204b facing the coil 203 is suppressed by a jig or the like. Thus, insertion of the plurality of magnets 1204a, 1204c whose surfaces opposite the coil 203 are N or S poles becomes easier.
[0144] FIG. 16 is a diagram illustrating operation of the magnetic substance 206 embedded in the fixing part 1205. The magnetic substance 206 is exposed at the opening 1208. As shown in (a) , when the magnet 1204b is inserted into the opening 1208, the magnet 1204b is attracted in the direction of the arrow. Thus, the magnet 1204b can be easily inserted into the opening 1208. Also, as shown in (b) , when the magnets 1204a, 1204c are inserted into the opening 1208, the magnets 1204a, 1204c are attracted in the direction of the arrows. Thus, the magnets 1204a, 1204c can be easily inserted into the opening 1208.
[0145] FIG. 17 shows a cross-sectional view of the fixing part 1205. The fixing part 1205 has side support parts 1705a, 1705b that abut outermost in the array direction of the plurality of magnets 1204a-1204c. When the magnets 1204a, 1204c are approached from above with the magnet 1204b disposed in the fixing part 1205, the N-pole of the magnet 1204a and the N-pole of the magnet 1204b are repulsed, and the force by which the magnet 1204a rotates counter-clockwise as indicated by arrow A3 acts. Also, the S-pole of the magnet 1204b and the S-pole of the magnet 1204c are repulsed, and the force of rotation of the magnet 1204c clockwise as indicated by arrow A4 acts. Therefore, by providing the side support parts 1705a, 1705b, it is possible to prevent the rotation of the magnets 1204a, 1204c.
[0146] Referring now to FIG. 18, another form of the fixing part used in the actuator 1214 will be described. A fixing part 1805 shown in FIG. 18 (a) may be composed of metal, preferably the magnetic substance such as iron. The fixing part 1805 includes a plate-like member 1806 and a magnet support parts 1802a-1802h.
[0147] FIG. 18 (b) shows mounting of the magnets 1204a-1204c in the fixing part 1805. At the fixing part 1805, magnet support parts 1802a, 1802b, 1802e, 1802f serve as side support parts that support the outermost of the array orientation of the magnets 1204a, 1204b, 1204c. The magnet support parts 1802c, 1802h have abutting portions C11, C14 that support the magnet 1204a and abut against the ends of the magnet 1204b. Furthermore, the magnet support parts 1802d, 1802g have abutting portions C13, C12 that support the magnet 1204c and abut against the ends of the magnet 1204b. In this way, the size of the fixing part can be reduced by configuring the fixing part 1805 consisting of metal.
[0148] (Third Embodiment)
[0149] Referring now to FIGS. 19 and 20, the configuration of the actuator 104 according to the third embodiment of the present disclosure will be described.
[0150] FIG. 19 is an exploded perspective view of an actuator 1914, and FIG. 20 is a side cross-sectional view of the actuator 1914. The actuator 1914 can be used in place of the actuator 104 of FIG. 1. The actuator 1914 includes a fixing part 1905, the magnetic substance 206, magnets 1904a, 1904b, 1904c, 1904d, the coil 203, and the movable part 202. The fixing part 1905 consists of a resin such as a super-engineering plastic or the liquid crystal polymer, and is formed in a plate shape. The fixing part 1905 is a support member that supports the magnets 1904a-1904d. The fixing part 1905 has an opening 1908 in the center in which the magnets 1904a-1904d are fitted.
[0151] The adjacent magnets 1904b, 1904c having different polarities on surfaces opposite the coil 203 are magnetized at an angle θ such that the magnetization direction expands in the direction toward the coil 203. As shown by the arrows in FIG. 20, the magnetizing direction of the magnet 1904b is oriented toward the upper left and is inclined at an angle θ with respect to the direction perpendicular to the surface opposite the coil 203. The magnetizing direction of the magnet 1904c is oriented toward the lower left and is inclined at an angle θ with respect to the direction perpendicular to the surface opposite the coil 203. Also, the magnetizing direction of the magnet 1904a is oriented toward the upper right and is inclined at an angle θ with respect to the direction perpendicular to the surface opposite the coil 203. The magnetizing direction of the magnet 1904d is oriented toward the lower right and is inclined at an angle θ with respect to the direction perpendicular to the surface opposite the coil 203.
[0152] The magnetization angle θ is preferably magnetized at an angle of 10 to 40 degrees relative to the vertical direction of the surface opposite the coil 203. It should be noted that in some embodiments, the angle θ of at least one of the magnetizing directions of the magnets 1904a-1904d may be different from the other magnets.
[0153] FIG. 21 shows a top view of the fixing part and the magnets according to the present embodiment; in which (a) illustrates a top view including the entire magnet; and (b) illustrates an enlarged view of the ends of the magnets. The magnets 1904a, 1904b have the N-poles on the top surface (i.e., the surface opposite the coil 203) , and the magnets 1904c, 1904d have the S-poles on the top surface. The magnets 1904b, 190c are also slightly shorter in length than the magnets 1904a, 1904d. The fixing part 1905 which is a support member has abutting portions C21, C22 that abut against the ends of the faces of the two non-adjacent magnets 1904a, 1904d facing each other.
[0154] Referring to FIG. 22, a method of inserting magnets 1904a-1904d into a fixing part 1905 will be described. First, as shown in (a) , the fixing part 1905 is provided such that the opening 1908 surfaces upward. Two magnets 1904a, 1904d are then inserted as shown in (b) . Here, although the inserted magnets 1904a, 1904d exert an attraction force as indicated by arrows A5, A6, the presence of abutting portions C21, C22 in the fixing part 1905 as shown in (c) prevents the magnets 1904a, 1904d from attracting. The magnets 1904b, 1904c are then inserted between the magnets 1904a, 1904d as shown in (d) . At this time, it is preferable to position guiding members 2202a, 2202b to guide insertion of the magnets 1904b, 1904c. The guiding members 2202a, 2202b are formed of a resin or the like and are arranged to hold down the two magnets 1904a, 1904d from above. In this way, the magnets 1904a, 1904d can be prevented from rotating by attraction or repulsion as the magnets 1904b, 1904c approach.
[0155] According to the present embodiment, in order to assemble the arranged magnets, the non-adjacent magnets 1904a, 1904d which have different polarities on surfaces facing the coil 203 are initially inserted into the support member. At this time, by the support member having the abutting portions C21 and C22 between the magnets 1904a, 1904d, it is possible to maintain the distance between the magnets 1904a, 1904d even if the attraction forces act on each other. Thereafter, it becomes easy to insert a set of magnets 1904b, 1904c with different polarities on surfaces facing the coil 203. At this time, the surface of the previously inserted magnets 1904a and 1904d facing the coils 203 is suppressed by a jig or the like. This facilitates the insertion of a set of magnets with different polarities on surfaces facing the coil 203.
[0156] FIG. 23 is a diagram illustrating a relationship between an interval between the two abutting portions provided in the fixing part 1905 and the width of the central magnets 1904b, 1904c. Since the fixing part 1905 is provided with two abutting portions C21, C22, it is formed into a convex shape. The interval A between the two abutting portions C21, C22 is greater than or equal to the sum B of the widths of the two magnets 1904b and 1904c. Creating a gap between the magnets in this way facilitates the insertion of the magnets 1904b, 1904c between the magnets 1904a, 1904d as shown in FIG. 22 (d) .
[0157] FIG. 24 is a diagram illustrating operation of the magnetic substance 206 embedded in the fixing part 1905. The magnetic substance 206 is exposed at the opening 1908. As shown in (a) , when the magnets 1904a, 1904d are inserted into the opening 1908, the magnets 1904a, 1904d are attracted in the direction of the arrow. Thus, the magnets 1904a, 1904d can be easily inserted into the opening 1908. Also, as shown in (b) , when the magnets 1904b, 1904c are inserted into the opening 1908, the magnets 1904b, 1904c are attracted in the direction of the dashed arrow. Thus, the magnets 1904b, 1904c can be easily inserted into the opening 1908.
[0158] FIG. 25 shows a cross-sectional view of the fixing part 1905. The fixing part 1905 has side support parts 2505a, 2505b that abut outermost in the array direction of the plurality of magnets 1904a-1904d. When the magnets 1904b, 1904c are approached from above with the two magnets 204a, 204d disposed in the fixing part 1905, the magnets 1904a and 1904b are repulsed, and the force by which the magnet 1904a moves in the direction indicated by the arrow A7 acts. Also, the magnet 1904c and the magnet 1904d repel, and the force by which the magnet 1904d moves in the direction indicated by the arrow A8 acts. Therefore, by providing the side support parts 2505a, 2505b, it is possible to prevent the movement of the magnets 1904a, 1904d.
[0159] Referring now to FIG. 26, another form of the fixing part used in the actuator 1914 will be described. A fixing part 2605 shown in FIG. 26 (a) may be composed of metal, preferably the magnetic substance such as iron. The fixing part 2605 includes a plate member 2606 and a magnet support parts 2602a-2602f.
[0160] FIG. 26 (b) shows the mounting of the magnets 1904a-1904d in the fixing part 2605. Magnet support parts 2602a, 2602b, 2602d, 2602e serve as side support parts that support the outermost of the array direction of the magnets 1904a-1904d. The magnet support parts 2602f has abutting portions C21, C22 that support the magnets 1904b, 1904c and abut against the ends of the magnets 1904a, 1904d. Furthermore, the magnet support part 2602c has abutting portions C23, C24 that support the magnets 1904b, 1904c and abut against the ends of the magnets 1904a, 1904d. In this way, the size of the fixing part can be reduced by configuring the fixing part 2605 consisting of metal.
[0161] (Fourth Embodiment)
[0162] Referring now to FIGS. 27 and 28, the configuration of the actuator 2704 according to the fourth embodiment of the present disclosure will be described.
[0163] FIG. 27 is an exploded perspective view of the actuator 2714. The actuator 2714 can be used in place of the actuator 104 of FIG. 1. The actuator 2714 includes a fixing part 2705, the magnetic substance 206, magnets 2704a-2704d, the coil 203, and the movable part 202. The fixing part 2705 is a support member that supports the magnets 2704a-2704d. The fixing part 2705 has an opening 2708 in the center in which the magnets 2704a-2704d are fitted.
[0164] FIG. 28 is a top view of the actuator 2714; (a) a general view including the entire magnet; and (b) an enlarged view of the upper end of the magnet. The left magnets 2704a, 2704b have the N-poles on the top surfaces (i.e., the surfaces opposite the coil 203) and the right magnets 2704c, 2704d have the S-poles on the top surfaces. The holding member 2705 has an abutting portion C31 that abuts the end of the side perpendicular to the array direction of the magnet 2704b and an abutting portion C32 that abuts the end of the side of the magnet 2704c perpendicular to the array direction.
[0165] Referring to FIG. 29, a method of inserting the magnets 2704a-204d into the fixing part 2705 will be described. First, as shown in (a) , the fixing part 2705 is provided such that the opening 2708 faces upward. The magnets 2704b, 2704c are then inserted as shown in (b) . Here, the magnets 2704b, 2704c are fixed because the abutting portions C31, C32 are present in the fixing part 2705 as shown in (c) . The magnets 2704a, 2704d are then inserted on both sides of the magnets 2704b, 2704c as shown in (d) . In this case, it is preferable to position guiding member 2902 to guide insertion of the magnets 2704a, 2704d. The guiding member 2902 is formed of a resin or the like and is arranged to hold down the magnets 2704b, 2704c from above. In this way, the magnets 2704b, 2704c can be prevented from rotating by the attraction or repulsion force as the magnets 2704a, 2704d approach.
[0166] According to the present embodiment, a pair of magnets 2704b, 2704c which has different polarities on surfaces facing the coil 203 is initially inserted into the support member. The remaining magnets 2704a, 2704d are then inserted into the support member adjacent to the pair of magnets. In this case, since the support member has the abutting portions C31, C32, the previously inserted pair of magnets 2704b, 2704c can remain in position. Thus, insertion of the magnets are facilitated. Also, when inserting the remaining magnets 2704a, 2704d, the surface side of the previously inserted magnets 2704b, 2704c facing the coil 203 is suppressed by a jig or the like. This makes it easier to insert the magnets 2704a, 2704d into the support member.
[0167] FIG. 30 illustrates a relationship between an interval of the two abutting portions provided in the fixing part 2705 and width of the central magnets 2704b, 2704c. Since the fixing part 2705 is provided with two abutting portions C31, C32, it is formed in a concave shape. The interval A of the two abutting portions C31, C32 is greater than or equal to the sum B of the widths of the magnets 2704b, 2704c. Creating the interval between the magnets 2704b, 2704c in this way facilitates the insertion of the magnets 2704a, 2704d into the fixing part 2705 as shown in FIG. 29 (d) .
[0168] FIG. 31 is a diagram illustrating operation of the magnetic substance 206 embedded in the fixing part 2705. The magnetic substance 206 is exposed at the opening 2708. Ass shown in (a) , when the magnets 2704b, 2704c are inserted into the opening 2708, the magnets 2704b, 2704c are attracted in the direction of the arrows. Thus, the magnets 2704b, 2704c can be easily inserted into the opening 2708. Also, as shown in (b) , when the magnets 2704a, 2704d are inserted into the opening 2708, the magnets 2704a, 2704d are attracted in the direction of the arrows. Thus, the magnets 2704a, 2704d can be easily inserted into the opening 2708.
[0169] FIG. 32 shows a cross-sectional view of the fixing part 2705. The fixing part 2705 has side support parts 3205a, 3205b that abut outermost in the array direction of the plurality of magnets 2704a-2704d. When the magnets 2704a, 2704d are approached from above with the magnets 2704b, 2704c disposed in the fixing part 2705, the magnets 2704a, 2704b are repulsed such that the forces moving in the direction indicated by the arrow A9 act on the magnet 2704a. Also, the magnet 2704c and the magnet 2704d repel, and the force that moves the magnet 2704d in the direction indicated by the arrow A10 acts. Therefore, by providing the side support parts 3205a, 3205b, it is possible to prevent the movement of the magnets 2704a, 2704d.
[0170] Referring now to FIG. 33, another form of the fixing part used in the actuator 2714 will be described. A fixing part 3305 shown in FIG. 33 (a) may be composed of metal, preferably the magnetic substance such as iron. The fixing part 3305 includes a plate-like member 3306 and magnet support parts 3302a-3302h.
[0171] FIG. 33 (b) shows the fixing part 3305 with the magnets 2704a-2704d mounted therein. The magnet support parts 3302a, 3302b, 3302e, 3302f serve as side support parts that support the outermost of the array direction of the magnets 2704a-2704d. The magnet support parts 3302c, 3302d have abutting portions C33, C34 that support the magnets 2704a, 2704d and abut against the ends of the central magnets 2704b, 2704c. Furthermore, the magnet support parts 3302g, 3302h have abutting portions C32, C31 that support the magnets 2704a, 2704d and abut against the ends of the central magnets 2704b, 2704c. By configuring the fixing part 3305 consisting of metal in this way, it is possible to reduce the size of the fixing part.
[0172] (Fifth Embodiment)
[0173] In the first embodiment, although examples of different lengths of magnets have been described, it is also possible to configure the lengths of the magnets to be partially different.
[0174] Referring now to FIG. 34, a configuration of a fixing part of the actuator according to a fifth embodiment of the present disclosure will be described. FIG. 34 is a diagram illustrating a fixing part 3405 according to the present embodiment. (a) shows a top view of the portion in which the ends of the magnet are inserted. The fixing part 3405 exposes the magnetic substance 206 in an opening 3408. (b) shows a top view of the fixing part 3405 into which magnets are fitted. A magnet 3404a has the N-pole on the top surface (i.e., a surface opposite the coil 203) and a magnet 3404c has the S-pole on the top surface. A magnet 3404b also has the N-pole on the left side and the S-pole on the right side. The magnets 3404a-3404c are equally aligned in length on the upper surface. (c) shows a cross-sectional view in a line AA of (b) . The magnet 3404b has a notch 3403 that engages an engaging portion 3402 of the fixing part 3405. This engaging portion 3402 has an abutting portion C41 that abuts the magnet 3404a and an abutting portion C42 that abuts the magnet 3404c.
[0175] FIG. 35 is a diagram illustrating a fixing part 3505 according to another embodiment. (a) shows a top view of the portion in which the ends of the magnets are inserted. A fixing part 3505 may be composed of metal, preferably the magnetic substance such as iron. The fixing part 3505 includes a plate member 3506 and magnet support parts 3502a, 3502b, 3502c.
[0176] FIG. 35 (b) shows the fixing part 3505 with the magnets 3404a-3404c mounted therein. At the fixing part 3505, the magnet support parts 3502a, 3502c serve as side support parts that support the outermost of the array direction of the magnets 3404a-3404c. The magnet support part 3502b supports the central magnet 3404b and has abutting portions C51, C52 that abut ends of surfaces of the two magnets 3404a, 3404c facing each other. (c) shows a cross-sectional view in a line AA of (b) . In addition, (d) shows a perspective view with the magnets 3404a-3404c mounted on the fixing part 3505, and (e) shows the arrangement of the magnets when the fixing part 3505 is removed from (d) . The notch 3403 of the magnet 3404b is engaged with the magnet support part 3502b.
[0177] This embodiment can also be applied to the second embodiment. In this case, notches are provided in magnets whose surfaces facing the coil 203 are N or S poles.
[0178] As described above, according to this embodiment, the magnet that does not abut the abutting portion has a notch at the end, and the support member has an engaging portion that engages with the notch. The abutting portion is provided on the engaging portion. Assembly of the actuator can be facilitated even in such a form.
[0179] (Sixth Embodiment)
[0180] In the third embodiment, although examples of different magnet lengths have been described, it is also possible to configure the lengths of the magnets to be partially different.
[0181] Referring now to FIG. 36, a configuration of a fixing part of an actuator according to a sixth embodiment of the present disclosure will be described. FIG. 36 is a diagram illustrating a fixing part 3605 according to the present embodiment. (a) shows a top view of the portion in which ends of the magnets are inserted. The fixing part 3605 exposes the magnetic substance 206 in an opening 3608. (b) shows a top view of the magnetized mounting 3605. Magnets 3604a, 3604b have the N-poles on the top surface (i.e., the surface opposite the coil 203) , and magnets 3604c, 3604d have the S-poles on the top surface. The magnets 3604a-3604d are equally aligned in length on the upper surface. (c) shows a cross-sectional view in a line AA of (b) . The magnet 3604b has an upper notch 3603 that engages an engaging portion 3602 of the fixing part 3605. This engaging portion 3602 has an abutting portion C61 that abuts the magnet 3604a and an abutting portion C62 that abuts the magnet 3604d.
[0182] FIG. 37 is a diagram illustrating a fixing part 3705 according to another embodiment. FIG. 37 (a) shows a top view of the portion where ends of the magnets are fitted. The fixing part 3705 may be composed of metal, preferably the magnetic substance such as iron. The fixing part 3705 includes a plate-like member 3706 and magnet support parts 3702a, 3702b, 3702c.
[0183] FIG. 37 (b) shows the fixing part 3705 with the magnets 3604a-3604d mounted therein. At the fixing part 3705, the magnet support parts 3702a, 3702c serve as side support parts that support the outermost of the array direction of the magnets 3604a-3604d. The magnet support part 3702b supports the central magnets 3604b, 3604c, and has abutting portions C71, C72 that abut ends of surfaces of the two magnets 3604a, 3604d facing each other. (c) shows a cross-sectional view in a line AA of (b) . The notch 3603 of the magnet 3604b is engaged with the magnet support part 3702b.
[0184] This embodiment can also be applied to the fourth embodiment. In this case, notches are provided in non-adjacent magnets having different poles on the surface facing the coil 203.
[0185] As described above, according to this embodiment, the magnet that does not abut the abutting portion has a notch at the end, and the support member has an engaging portion that engages with the notch. The abutting portion is provided on the engaging portion. Assembly of the actuator can be facilitated even in such a form.
[0186] The embodiments described above can be applied to any camera unit that can use the optical image stabilization function or the autofocus function. For example, the above-described embodiments can be applied to smartphone built-in cameras, tablet built-in cameras, action cameras, interchangeable lens cameras, surveillance cameras, in-vehicle cameras, aircraft-mounted cameras, and the like.
[0187] The foregoing descriptions are merely specific implementation manners of the present invention, but are not intended to limit the protection scope of the present invention. Any variation or replacement readily figured out by a person skilled in the art within the technical scope disclosed shall fall within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims
1.An actuator for camera, comprising:a plurality of magnets arranged;a fixing part;a movable part movable relative to the fixing part; anda coil,wherein one of the fixing part and the movable part is a support member that supports the plurality of magnets, wherein the coil is supported by the other of the fixed portion and the movable portion so as to face the plurality of magnets, wherein the plurality of magnets has two magnets having poles on surfaces opposite the coil, and wherein the support member has abutting portions that abut ends of opposing surfaces of the two magnets.2.An actuator for camera, comprising:a plurality of magnets arranged;a fixing part; anda movable part movable relative to the fixing part; anda coil,wherein one of the fixing part and the movable part is a support member that supports the plurality of magnets, wherein the coil is supported by the other of the fixed portion and the movable portion so as to face the plurality of magnets, wherein the plurality of magnets has at least one magnet that is magnetized in an array direction of the plurality of magnets, and wherein the support member has abutting portions that abut ends of two sides of the at least one magnet perpendicular to the array direction.3.The actuator for camera according to claim 1 or 2, wherein the plurality of magnets is arranged in a Halbach array.4.The actuator for camera according to claim 1 or 2, wherein an interval between two of the abutting portions is greater than or equal to width of a magnet inserted between two of the plurality of magnets.5.The actuator for camera according to claim 1 or 2, wherein the support member is provided with a magnetic substance on a surface of the plurality of magnets opposite to the other surface of the magnets opposite the coil.6.The actuator for camera according to claim 1 or 2, wherein the support member has a member that abuts outermost in an array direction of the plurality of magnets.7.The actuator for camera according to claim 1 or 2, wherein the abutting portion consists of a resin.8.The actuator for camera according to claim 1 or 2, wherein the abutting portion consists of metal.9.The camera actuator of claim 1, wherein two of the plurality of magnets are non-adjacent magnets having different polarities on surfaces opposite the coil.10.An actuator for camera, comprising:a coil;a plurality of magnets magnetized at a predetermined angle relative to a direction perpendicular to a surface opposite the coil;a fixing part; anda movable part movable relative to the fixing part,wherein one of the fixing part and the movable part is a support member that supports the plurality of magnets, wherein the coil is supported by the other of the fixed portion and the movable portion so as to face the plurality of magnets, and wherein the support member has abutting portions that abut ends of a pair of non-adjacent magnets, and wherein the pair of non-adjacent magnets has different polarities on surfaces facing the coil.11.The actuator for camera according to claim 10, wherein an interval between two of the abutting portions is greater than or equal to width of a pair of adjacent magnets having different polarities on surfaces facing the coil.12.The actuator for camera according to claim 10, wherein the support member is provided with a magnetic substance on a surface of the plurality of magnets opposite to the other face of the magnets opposite the coil.13.The actuator for camera according to claim 10, wherein the support member has a member that abuts an end of the plurality of magnets in an array direction.14.The actuator for camera according to claim 10, wherein the abutting portion consists of a resin.15.The actuator for camera according to claim 10, wherein the abutting portion consists of metal.16.An actuator for camera, comprising:a coil;a plurality of magnets magnetized at a predetermined angle relative to a direction perpendicular to a surface opposite the coil;a fixing part; anda movable part movable relative to the fixing part,wherein one of the fixing part and the movable part is a support member that supports the plurality of magnets, wherein the coil is supported by the other of the fixed portion and the movable portion so as to face the plurality of magnets, and wherein the support member has abutting portions that abut ends of a pair of adjacent magnets, and wherein the pair of adjacent magnets has different polarities on surfaces facing the coil.17.The actuator for camera according to claim 16, wherein an interval between two of the abutting portions is greater than or equal to width of the pair of adjacent magnets.18.The actuator for camera according to claim 16, wherein the support member is provided with a magnetic substance on a surface of the plurality of magnets opposite to the other face of the magnets opposite the coil.19.The actuator for camera according to claim 16, wherein the support member has a member that abuts an end of the plurality of magnets in an array direction.20.The actuator for camera according to claim 16, wherein the abutting portion consists of a resin.21.The actuator for camera according to claim 16, wherein the abutting portion consists of metal.22.The actuator for camera according to any one of claims 1 to 9, wherein the magnet that does not abut the abutting portion has a notch at an end thereof, wherein the support member has an engaging portion that engages with the notch, and the abutting portion is provided in the engaging portion.23.The actuator for camera according to any one of claims 1 to 9, wherein the magnet that does not abut the abutting portion has a notch at an end thereof, wherein the support member has an engaging portion that engages with the notch, and the abutting portion is provided in the engaging portion.24.A camera module having the actuator for camera according to any one of claims 1 to 23.25.An imaging apparatus having the actuator for camera according to any one of claims 1 to 23.
Citation Information
Patent Citations
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