JP2019002972A - Lens drive device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize a lens drive. A lens driving device of the present invention includes a lens barrel equipped with a lens, a housing accommodating the lens barrel, and a first voice coil motor for moving the lens barrel with respect to the housing along the optical axis direction. A first guide portion that guides the movement of the lens barrel with respect to the housing, a support cover that supports the housing on one side of the lens, and a second that moves the housing perpendicular to the optical axis direction with respect to the support cover. It includes a voice coil motor, a second guide portion arranged between the housing and the support cover to guide the movement of the housing with respect to the bottom cover, and a connecting member for connecting the housing and the support cover. The connecting member is configured to maintain a constant distance between the housing and the support cover for connection. [Selection diagram] Fig. 1

Description

  The present invention relates to a lens driving device, and more particularly to a lens driving device having an autofocus function and a shake correction function.

  Information processing terminals such as smartphones and tablet terminals in recent years are equipped with a small camera module for capturing images. Such a camera module has a lens that has an autofocus function that automatically focuses when shooting a subject, and a shake correction function that optically corrects camera shake that occurs during shooting to reduce image distortion. A drive device is provided.

  The autofocus function of the lens driving device is realized by, for example, a voice coil motor including a magnet and a coil as shown in Patent Document 1. The lens is reciprocated along the optical axis direction by using the driving force of the voice coil motor. Along with this, the lens driving device supports reciprocal movement along the optical axis direction of the lens by the autofocus function by a guide ball disposed around the lens driving device.

JP2015-180937A

  Here, in the lens driving device having the above-described autofocus function, it is necessary to stably reciprocate the lens when moving along the optical axis direction. In other words, it is necessary to suppress the swing of the optical axis of the lens as it moves. For this reason, it is desired to improve the stability of the lens when reciprocating. Furthermore, since the lens driving device also has a shake correction function, it is desired to improve the stability when driving the lens even in combination with the structure of the shake correction function.

The lens driving device according to one aspect of the present invention is
A lens barrel equipped with a lens;
Surrounding the lens barrel and housing the lens barrel;
A first voice coil motor that moves the lens barrel relative to the housing along an optical axis direction of the lens;
A first guide portion for guiding the movement of the lens barrel with respect to the housing;
With
The first voice coil motor includes a magnet on one of the housing and the lens barrel and a coil and a yoke on the other, and the lens barrel is moved to the first barrel by a magnetic force attracted to the magnet. Place the yoke to press against the guide part,
further,
A support cover for supporting the housing on one side of the lens;
A second voice coil motor that moves the housing in a direction perpendicular to the optical axis direction of the lens with respect to the support cover;
A second guide part disposed between the housing and the support cover, abutting the housing and the support cover, and guiding the movement of the housing relative to the support cover;
A connecting member for connecting the housing and the support cover;
With
The second voice coil motor includes a magnet on one of the housing and the support cover and a coil and a yoke on the other.
The connecting member is configured to connect with a constant distance between the housing and the support cover.
The configuration is as follows.

The lens driving device is
The connecting member is configured to bias a force that pulls the housing and the support cover together through the second guide portion.
The configuration is as follows.

The lens driving device is
The connecting member is configured to have flexibility with respect to a direction perpendicular to the optical axis direction of the lens.
The configuration is as follows.

The lens driving device is
The connecting member is constituted by a tension spring that biases a force that pulls the housing and the support cover together.
The configuration is as follows.

The lens driving device is
The second guide part is arranged at each position preset with respect to the support cover, and is composed of a plurality of spheres rotating at the respective arrangement positions.
The configuration is as follows.

The lens driving device is
The second voice coil motor is configured by two voice coil motors that respectively move the housing in two linear directions orthogonal to each other on a plane perpendicular to the optical axis direction of the lens.
The configuration is as follows.

The lens driving device is
The first voice coil motor is disposed at two adjacent sides of the substantially rectangular lens barrel,
The first guide portion is disposed at an intermediate position between the two first voice coil motors,
The yoke is arranged so as to press the lens barrel against the first guide portion by the resultant magnetic force of the yokes of the two first voice coil motors,
The configuration is as follows.

The lens driving device is
The first guide portion includes a main guide portion disposed in the vicinity of a corner sandwiched between two adjacent sides of the substantially rectangular lens barrel in which the two first voice coil motors are disposed, and the main guide portion. A sub-guide portion disposed near another corner located diagonally to the corner of the lens barrel having a substantially rectangular shape in which the guide portion is disposed,
The yokes provided in each of the two first voice coil motors are configured such that magnetic forces attracted to the magnets are different from each other.
The sub-guide portion is configured to support pressing by the lens barrel that is biased to rotate about the main guide portion by a resultant force of the magnetic forces of the yokes of the two first voice coil motors. ing,
The configuration is as follows.

The lens driving device is
The housing of the lens is used as the second voice coil motor in the vicinity of the other two sides different from the adjacent two sides of the substantially rectangular lens barrel in which the first voice coil motor is arranged. Two voice coil motors that are movable in two linear directions orthogonal to each other on a plane perpendicular to the optical axis direction are arranged.
The configuration is as follows.

  The present invention also provides a camera module equipped with the lens driving device.

  According to the lens driving device of the present invention, the lens barrel is pressed against the first guide portion to guide the movement in the optical axis direction. Further, the second guide portion guides the movement in the direction perpendicular to the optical axis direction while the housing for accommodating the lens barrel is kept at a certain distance from the support cover. As a result, it is possible to improve the stability of lens movement by the autofocus function and the shake correction function.

It is a figure which shows the structure of the camera module in the 1st Embodiment of this invention. It is a figure which shows the structure of the lens barrel which comprises a camera module. It is a figure which shows the structure of the housing which comprises a camera module. It is a figure which shows the structure of the cover and bottom cover which comprise a camera module. It is a figure which shows the structure of FPC which comprises a camera module. It is a figure which shows the structure of the magnet and coil which comprise a camera module. It is a figure which shows the structure of the yoke which comprises a camera module. It is a figure which shows the mode of an assembly | attachment of a camera module. It is a figure which shows operation | movement of a camera module. It is a figure which shows operation | movement of a camera module.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram illustrating a configuration of the camera module 1. 2 to 7 are diagrams showing components constituting the camera module. FIG. 8 is a diagram illustrating how the camera module is assembled. 9 to 10 are diagrams illustrating the operation of the camera module.

  The camera module 1 according to the present invention is for image shooting that is mounted on an information processing terminal such as a smartphone or a tablet terminal. However, the camera module 1 in the present invention is not necessarily limited to being mounted on an information processing terminal, and may be mounted on other electronic devices or various devices.

  The camera module 1 according to the present invention has an autofocus function that automatically performs focusing when shooting a subject, and a shake correction function that optically corrects camera shake that occurs during shooting to reduce image distortion. A lens driving device is provided. Hereinafter, a configuration of a lens driving device that realizes an autofocus function and a shake correction function will be mainly described. The lens driving device may have a function other than the functions exemplified in this embodiment.

[Constitution]
First, the overall configuration of the camera module 1 will be described with reference to FIG. FIG. 1 is a plan view and side views of the camera module 1. In the drawings of the present application, a part of the configuration is illustrated or omitted so that the structure is clear.

  First, the camera module 1 includes a cover 5 that covers an upper portion and a bottom cover 6 that covers a lower portion. In FIG. 1, the upper surface and side surfaces of the cover 5 are shown in a transparent manner. The camera module 1 includes a lens barrel 3 equipped with a lens 2 inside a cover 5 and a bottom cover 6 (support cover), a housing 4 surrounding the lens barrel 3 and housing the lens barrel 3, It has. In addition, the camera module 1 includes two first voice coil motors 71 to 73 that operate the lens barrel 3 along the optical axis direction of the lens 2 with respect to the housing 4, and the movement of the lens barrel 3 with respect to the housing 4. Two first guide portions 76 and 77 for guiding are provided. Note that the autofocus function of the lens 2 is realized mainly by the first voice coil motors 71 to 73 and the first guide portions 76 and 77.

  The housing 4 is supported by a bottom cover 6 on the lower surface side (one surface side) of the lens 2, and the camera module 1 places the housing 4 in a direction perpendicular to the optical axis direction of the lens 2 with respect to the bottom cover 6. The second voice coil motors 74 and 75 are operated. In addition, the camera module 1 is disposed between the housing 4 and the bottom cover 6, and includes a second guide portion 78 that guides the movement of the housing 4 relative to the second voice coil motors 74 and 75, the housing 4 and the bottom cover. And a connecting spring 79 (connecting member) that connects the cover 6. Note that the shake correction function of the lens 2 is realized mainly by these configurations.

  Further, the camera module 1 includes an FPC (Flexible Printed Circuits) 8 and other configurations. Each configuration will be described below.

  The configuration of the lens barrel 3 will be described with reference to FIG. FIG. 2 is a plan view and side views of the lens barrel 3. The lens barrel 3 has a substantially rectangular outer shape. A lens housing hole for housing the lens 2 is formed at the center of the lens barrel 3.

  Further, concave portions 33 and 34 that are recessed inward are formed on the side surface of the lens barrel 3. Specifically, of the side surface of the lens barrel 3, two sides of a substantially rectangular shape are adjacent to each other, and concave portions 33 and 34 are formed from corner portions that are intersections of the two sides. Magnets 71a and 71b constituting the first voice coil motor are disposed in the recesses 33 and 34, respectively. The first voice coil motor moves the lens barrel 3 along the optical axis direction of the lens 2 and faces the magnets 71a and 71b (magnets) and the magnets 71a and 71b as will be described later. The coils 72 a and 72 b and the yokes 73 a and 73 b disposed in the housing 4 are configured. As described above, the first voice coil motor that realizes the autofocus function is provided at each of two adjacent sides of a substantially rectangular shape.

  A first guide ball holding portion 31 is formed at an angular position sandwiched between two adjacent sides of the substantially rectangular lens barrel 3 where the two first voice coil motors are arranged. The first guide ball holding portion 31 is formed by a groove along the optical axis direction of the lens 2, and the groove opens to the outside on a diagonal line passing through the formed corner position. And the 1st guide ball holding part 31 hold | maintains so that the main guide ball 76 (main guide part) of the spherical body which is a part of 1st guide part can rotate. The main guide ball 76 is pressed against and supported by a first guide ball support portion 41 formed on the inner surface of the housing 4 to be described later. As a result, the main guide ball 76 rotates in the groove that is the first guide ball holding portion 31. Accordingly, the lens barrel 3 is guided by the main guide ball 76 to the optical axis direction of the lens 2. It will move along. 2 shows that the two main guide balls 76 are held in the groove that is the guide ball holding portion 31, the number of the main guide balls 76 may be any number.

  The lens barrel 3 has second guide ball holding portions 32 formed at other corner positions diagonally with respect to the corner position where the first guide ball holding portion 31 is formed. . The second guide ball holding portion 32 is formed by a substantially spherical hole, and the hole opens in a direction perpendicular to a diagonal line passing through the formed corner position. The second guide ball holding portion 32 holds a spherical sub guide ball 77 (sub guide portion) that is a part of the first guide portion so as to be rotatable. The sub guide ball 77 is supported by being pressed against a second guide ball support portion 42 formed on the inner surface of the housing 4 to be described later. As a result, the sub guide ball 77 rotates in the hole that is the second guide ball holding portion 32, and accordingly, the lens barrel 3 moves along the optical axis direction of the lens 2. .

  The lens barrel 3 may include a position detection mechanism that detects a position of the lens barrel 3 along the optical axis direction of the lens 2. For example, the position detection mechanism may include a magnet and a Hall element that detects the strength of the magnetic field. Among these, the magnet may be disposed in the lens barrel 3 and the Hall element may be disposed in the housing 4 described later.

  Next, the structure of the housing 4 will be described with reference to FIG. FIG. 3 shows a plan view, side views, and bottom view of the housing 4.

  The housing 4 is formed of four side walls, and is a cylindrical member whose end face is substantially rectangular. The housing 4 accommodates the lens barrel 3 equipped with the lens 2 described above, and is also equipped with components constituting the first voice coil motor. Further, the housing 4 is also equipped with components constituting a second voice coil motor described later.

  Specifically, on the inner surface of one corner position of the housing 4, that is, the inner surface of the corner position corresponding to the first guide ball holding portion 31 formed in the lens barrel 3 accommodated therein, the main guide A concave first guide ball support portion 41 for receiving the ball 76 is formed. Further, on the inner surface of another angular position located on the diagonal line of this angular position, that is, on the inner surface of the angular position corresponding to the second guide ball holding portion 32 formed in the lens barrel 3 accommodated therein. A concave second guide ball support portion 42 for receiving the sub guide ball 77 is formed.

  In addition, first recesses 43 and 44 are formed in two of the side walls of the housing 4 so that the inner surface of the side wall itself is formed in a concave shape. Specifically, first recesses 43 and 44 are formed at positions facing the magnets 71a and 71b mounted on the lens barrel 3 housed in the side wall of the housing 4, respectively. In each of the first recesses 43 and 44, coils 72a and 72b and yokes 73a and 73b constituting the first voice coil motor are respectively arranged.

  In addition, second recesses 45 and 46 that are recessed upward are formed on the bottom surface of the side wall of the housing 4. Specifically, the second recesses are respectively formed on the bottom surfaces of the two side portions of the side wall of the housing 4 that are adjacent to each other in a substantially rectangular shape and are not formed with the first recesses 43 and 44. 45 and 46 are formed. And magnet 74a, 74b which comprises a 2nd voice coil motor is each arrange | positioned at each 2nd recessed part 45,46. The second voice coil motor is for moving the housing 4 housing the lens barrel 3 along a plane perpendicular to the optical axis direction of the lens 2, and will be described later with the magnets 74a and 74b (magnets). Thus, it is comprised by the coil 75a, 75b arrange | positioned at the bottom cover 6. FIG. At this time, the first second voice coil motor composed of the magnet 74b shown in FIG. 1 is along one linear direction (X-axis direction) on a plane perpendicular to the optical axis direction of the lens 2. Move. In addition, the second second voice coil motor constituted by a magnet denoted by reference numeral 74a has another linear direction (Y-axis direction) orthogonal to the one linear direction on a plane perpendicular to the optical axis direction of the lens 2. Move along.

  Further, on the bottom surfaces of the four corners of the housing 4, cut portions 47 that are cut toward the upper surface side are formed. The four cutouts 47 accommodate connection springs 79, respectively. For this reason, one end of the connection spring 79 is hooked on the inner surface of the ceiling of each cutout 47.

  Further, on the bottom surface of the housing 4, support guide ball receiving portions 48 that are formed in a concave shape and receive a support guide ball 78 described later are formed at three locations.

  The housing 4 may include a part of a position detection mechanism that detects the position of the lens 2 in the lens barrel 3 along the optical axis direction. The position detection mechanism includes, for example, a magnet and a hall element that detects the strength of the magnetic field, and the housing 4 includes a hall element that detects the strength of the magnetic field of the magnet disposed in the lens barrel 3. May be. Further, the housing 4 may be provided with a position detection mechanism that detects a position in the direction perpendicular to the optical axis direction of the lens 2 of the housing 4, that is, a position with respect to the bottom cover 6. For example, a magnet may be provided on the housing 4 and a hall element may be provided on the bottom cover 6.

  Next, the configuration of the cover 5 and the bottom cover 6 will be described with reference to FIG. 4A shows a plan view and a side view of the cover 5 and FIG. 4B shows a bottom cover 6, respectively.

  The cover 5 has an upper surface formed in a substantially rectangular shape, and is formed in a box shape having four sides surrounded by side walls. And the housing 4 etc. which were mentioned above are covered from upper direction. A hole corresponding to the size of the lens 2 is formed at the center of the upper surface of the cover 5.

  The bottom cover 6 is a plate-like member formed in a substantially rectangular shape, and covers the bottom surface of the housing 4 and the like covered with the cover 5. A hole corresponding to the size of the lens 2 is formed at the center of the bottom cover 6. Further, hooking portions 61 for hooking the other ends of the connecting springs 79 described above are formed at the four corners of the bottom cover 6. Further, three accommodation portions 62 are formed in the bottom cover 6. Each accommodating part 62 accommodates the supporting guide ball 78 which is a spherical body so as to be rotatable, and defines the position of the supporting guide ball 78. The support guide ball 78 is sandwiched between the support guide ball receiving portion 48 formed on the housing 4 and the bottom cover 6, and the housing 4 is on the surface perpendicular to the optical axis direction of the lens 2 with respect to the bottom cover 6. It has a function to guide the movement. In addition, the number of the accommodating parts 62 mentioned above is not limited to three, In connection with this, the number of the support guide balls 78 is not limited to three.

  Next, the configuration of the FPC will be described with reference to FIG. FIG. 5 is a plan view and a side view of the FPC 8.

  The FPC 8 has a thin plate shape, and the outer shape is substantially the same as that of the bottom cover 6. For this reason, it can be assembled almost integrally with the bottom cover 6 and can be handled as the same member as the bottom cover 6. The two adjacent sides of the FPC 8 are provided with coils 75a and 75b constituting a second voice coil motor, respectively. Specifically, the coils 75a and 75b are provided at positions facing the magnets 74a and 74b constituting the second voice coil motor provided in the housing 4 described above.

  Next, components constituting the first voice coil motor and the second voice coil motor will be described with reference to FIGS. First, the first voice coil motor is composed of magnets 71 a and 71 b disposed in the lens barrel 3, coils 72 a and 72 b and yokes 73 a and 73 b installed in the housing 4.

  As shown in the front view and plan view of FIG. 6A, the magnets 71a and 71b constituting the first voice coil motor are formed in a rectangular shape having a predetermined thickness. Further, as shown in the front view and the plan view of FIG. 6B, the coils 72a and 72b constituting the first voice coil motor have an outer shape of almost the same size as the magnets 71a and 71b, and are elliptical ring-shaped. Is formed.

  Further, as shown in the front view and the plan view of FIGS. 8A and 8B, the yokes 73a and 73b constituting the first voice coil motor are each formed in a T-shaped thin plate shape. The shapes are slightly different from each other. The first yoke 73a shown in FIG. 8A is arranged corresponding to the magnet 71a and the coil 72a, and the second yoke 73b shown in FIG. 8B is connected to the magnet 71b and the coil 72b. It is arranged correspondingly. As shown in the figure, the shape of the second yoke 73b is larger than the shape of the first yoke 73a. Specifically, the thickness of the foot portion of the T-shaped shape of the second yoke 73b is formed to be thicker than that of the first yoke 73a. Each of the yokes 73a and 73b has a head portion of a T-shaped shape disposed at a corner portion that is an intersection of two adjacent sides of the lens barrel 3 to be disposed.

  The second voice coil motor is composed of magnets 74 a and 74 b disposed in the housing 4 and coils 75 a and 75 b installed in the bottom cover 6, that is, the FPC 8. As shown in the front view and plan view of FIG. 7C, the magnets 74a and 74b constituting the second voice coil motor are formed in a rectangular shape having a predetermined thickness. Further, as shown in the front view and the plan view of FIG. 7D, the coils 75a and 75b constituting the second voice coil motor have an outer shape that is substantially the same size as the magnets 74a and 74b, and are elliptically annular. Is formed.

[Assembly]
Next, how the camera module 1 is assembled will be described with reference to FIG. FIG. 8 shows the camera module 1 shown in FIGS. 1 and 10 as viewed from the right side. In the assembly procedure described below, the order of each step may be changed.

  First, the assembly of the housing 4 and the bottom cover 6 will be described with reference to FIG. The housing 4 and the bottom cover 6 are coupled via a coupling spring 79 with the FPC 8 interposed therebetween. Specifically, first, the four connecting springs 79 are arranged in the respective cutout portions 47 formed on the bottom surfaces of the four corners of the housing 4, and one end is hooked to the ceiling surface of each cutout portion 47 to be connected. To do. 8D, the other end of each connecting spring 79 is inserted into the holes formed in the four corners of the FPC 8, and formed in the four corners of the bottom cover 6. As shown in FIG. The hook 61 is hooked and connected.

  At this time, on the bottom cover 6, the support guide balls 78 are respectively disposed in the three accommodating portions 62 formed on the surface on the housing 4 side. Then, the support guide ball 78 passes through the three through holes formed in the FPC 8 and comes into contact with the housing 4 at the support guide ball receiving portion 48 formed on the bottom surface of the housing 4. Accordingly, the support guide ball 78 is disposed in a state of being sandwiched between the housing 4 and the bottom cover 6.

  By assembling the housing 4, the FPC 8, and the bottom cover 6 as described above, the connecting spring 79 urges the force that pulls the housing 4 and the bottom cover 6 together while sandwiching the support guide ball 78. . For this reason, as shown in FIG. 8C, the housing 4 and the bottom cover 6 are integrated, and are always connected with a distance corresponding to the diameter of the support guide ball 78.

  Prior to the assembly, the coils 75a and 75b constituting the second voice coil motor are arranged in the FPC 8. In addition, magnets 74a and 74b constituting a second voice coil motor are arranged in the second recesses 45 and 46 formed on the bottom surface of the housing 4 so as to face the coils 75a and 75b, respectively. Thus, it is possible to realize driving by the shake correction function. Further, coils 72a and 72b and yokes 73a and 73b constituting the first voice coil motor are arranged in the first recesses 43 and 44 formed on the side wall of the housing 4, respectively.

  Subsequently, the lens barrel 3 shown in FIG. 8B is accommodated in the housing 4 described above. At this time, the lens 2 is mounted on the lens barrel 3 in the central lens housing hole. Magnets 71a and 71b constituting the first voice coil motor are disposed in the recesses 33 and 34 formed on the side surface of the lens barrel 3, respectively. The magnets 71 a and 71 b are opposed to the coils 72 a and 72 b and the yokes 73 a and 73 b constituting the first voice coil motor disposed in the housing 4 by accommodating the lens barrel 3 in the housing 4. Therefore, driving by the autofocus function can be realized.

  In the lens barrel 3, a main guide ball 76 is attached to the first guide ball holding portion 31, and a sub guide ball 77 is attached to the second guide ball holding portion 32. When the lens barrel 3 is housed in the housing 4, the main guide ball 76 is supported in contact with the first guide ball support portion 41 of the housing 4, and the sub guide ball 77 is supported by the second guide ball 77. The guide ball support part 42 is abutted and supported.

  During the above procedure, a magnet, a hall element, or the like constituting a position detection mechanism that detects the position of the lens barrel 3 along the optical axis direction of the lens 2 or the position of the housing 4 on a plane perpendicular to the optical axis direction. These parts and other parts not shown may be mounted.

  Finally, the cover 5 shown in FIG. 8A is covered from above so as to cover the housing 4, and the assembly of the camera module 1 is completed.

[Operation]
Next, the operation of the camera module 1 will be described with reference to FIGS. First, with reference to FIG. 9A and FIG. 10, the lens drive of the autofocus function by the camera module 1 will be described.

  As shown in FIG. 9A, the first voice coil motor that realizes the autofocus function includes a magnet 71a in which N pole and S pole are magnetized on the upper and lower sides of the lens barrel 3, and a housing 4 side. The coil 72a and the yoke 73a are configured. The yoke 73a is made of, for example, a soft magnetic material (for example, iron with less impurities) that concentrates the magnetic flux emitted from the magnet 71a. The first voice coil motor is equipped with another set, but only one composed of parts 71a, 72a and 73a will be described here.

  A driving force for moving the lens barrel 3 along the optical axis direction of the lens 2 is generated by passing a current through the coil 72a. Specifically, when an electric current is passed through the coil 72a, the lens barrel 3 is connected to the lens 2 according to Fleming's left-hand rule based on the direction of the electric current and the magnetic flux passing through the coil 72a from the magnet 71a (see arrow Y1). Are driven to reciprocate along the optical axis direction (arrow Y21 direction in FIG. 10: Z-axis direction).

  At this time, the lens barrel 3 is equipped with a main guide ball 76 and a sub guide ball 77 which are in contact with the housing 4, and the lens barrel 3 is driven by the two first voice coil motors. It is in the state pressed against. Specifically, first, the magnetic force indicated by the arrows Y11 and Y12 in FIG. 10 is generated in the two first voice coil motors. Therefore, the resultant force Y13 is applied to the lens barrel 3. For this reason, the lens barrel 3 is in a state of pressing the main guide ball 76 in the direction of the corner along the diagonal line.

  As shown in FIG. 10, the magnitudes of the magnetic forces Y11 and Y12 acting on the two first voice coil motors are different. Specifically, as shown in FIG. 7, the outer shape of the yoke 73b corresponding to the magnet 71b constituting one first voice coil motor corresponds to the magnet 71a constituting the other first voice coil motor. It is formed larger than the outer shape of the yoke 73a. For this reason, the magnetic force Y12 that the magnet 71b in one of the first voice coil motors is attracted to the side is stronger than the magnetic force Y11 that the other magnet 71a is attracted to the side. Then, due to the resultant force of the magnetic forces Y11 and Y12, the lens barrel 3 is urged to rotate about the main guide ball 76 as indicated by an arrow Y14. As a result, the lens barrel 3 is in a state of pressing the sub guide ball 77 in a direction substantially perpendicular to the diagonal line, and the sub guide ball 77 is configured to support such pressing.

  As a result, the lens barrel 3 is maintained in contact with the housing 4 via the main guide ball 76 and the sub guide ball 77. Then, the movement in the direction perpendicular to the optical axis in the housing 4 is restricted, and the posture is stabilized. As a result, it is possible to realize a stable autofocus operation without shaking the optical axis.

  The two first voice coil motors generate a magnetic flux that passes through the yokes 73a and 73b from the magnets 71a and 71b. At this time, the yokes 73a and 73b try to take in the magnetic flux from the magnets 71a and 71b as much as possible. There is a nature to do. For this reason, the yokes 73a and 73b act so as to be positioned opposite to the centers of the magnets 71a and 71b, that is, the boundary between the N pole and the S pole. Due to such a magnetic levitation effect, the lens barrel 3 to which the magnets 71a and 71b are coupled is levitated so that the yokes 73a and 73b are positioned at the boundary between the north and south poles of the magnets 71a and 71b. Furthermore, if the lens barrel 3 to which the magnets 71a and 71b are connected moves according to Fleming's left-hand rule and the position of the yokes 73a and 73b shifts up and down with respect to the center of the magnets 71a and 71b, the magnetic force causes A magnetic spring effect is generated to return to the original position.

  As described above, the lens barrel 3 to which the magnets 71a and 71b are connected is stably positioned at a position corresponding to the installation position of the yokes 73a and 73b. For this reason, by setting the position of the lens barrel 3 due to the magnetic levitation effect to a predetermined position, such as a focus focusing position that is frequently used, the lens barrel 3 by the first voice coil motor described above is set. Driving can be suppressed and power saving can be achieved.

  Next, with reference to FIG. 9B and FIG. 10, lens driving of the shake correction function by the camera module 1 will be described.

  As shown in FIG. 9B, the second voice coil motor that realizes the shake correction function includes a magnet 74b in which the N pole and S pole on the housing 4 side are magnetized, and a coil 75b on the bottom cover 6 side. And is constituted by. Although the second voice coil motor is provided in another set, only one constituted by parts 74b and 75b will be described here.

  Then, by supplying a current to the coil 75b, a driving force for moving the housing 4 housing the lens barrel 3 along a predetermined direction on a plane perpendicular to the optical axis direction of the lens 2 is generated. Specifically, when a current is passed through the coil 75b, the housing 4 is connected to the lens 2 according to Fleming's left-hand rule by the direction of the current and the magnetic flux (see arrow Y2) passing from the magnet 74b to the coil 75b. It is driven to reciprocate along a straight line direction on the plane perpendicular to the optical axis direction (arrow Y22 direction in FIG. 10: X axis direction). Note that the housing 4 is a straight line perpendicular to the straight line direction (X-axis direction) on the plane perpendicular to the optical axis direction of the lens 2 by the magnet 74a and the coil 75a constituting another set of the second voice coil motor. It is reciprocated along the direction (Y-axis direction). That is, the housing 4 is reciprocally driven in the linear directions orthogonal to each other on the plane perpendicular to the optical axis direction of the lens 2 by the two second voice coil motors.

  At this time, the housing 4 and the bottom cover 6 are connected to each other by a connecting spring 79 with the support guide ball 78 interposed therebetween. For this reason, the housing 4 is reciprocally driven on the bottom cover 6 with the support guide ball 78 as a guide by the driving by the second voice coil motor. In addition, since the connecting spring 79 has flexibility in the direction perpendicular to the optical axis direction of the lens 2, as shown by the arrow Y23 in FIG. 10, when the second voice coil motor is driven. However, since the housing 4 and the bottom cover 6 are always urged toward each other, the housing 4 and the bottom cover 6 are always connected with a distance corresponding to the diameter of the support guide ball 78. It becomes a state. For this reason, the distance between the magnets 74a and 74b arranged in the housing 4 and the coils 75a and 75b arranged in the bottom cover 6 constituting the second voice coil motor is always constant. As a result, the driving by the second voice coil motor is stabilized.

  Further, since the second voice coil motor is configured in the structure guided by the support guide ball 78 as described above, it has high reliability such as being able to withstand dropping. Furthermore, since the second voice coil motor having the above-described configuration is not a spring mass system, it does not have a resonance system. From this point of view, the reliability can be improved.

  Note that the mounting positions of the first voice coil motor and the second voice coil motor described above are not limited to the above-described positions, and may be provided at any positions. Further, the shape of the parts constituting the voice coil motor is not limited to the shape described above, and the number thereof is also arbitrary.

  In the present embodiment, the first voice coil motor has been described in which the lens barrel 3 has the magnets 71a and 71b, and the housing 4 has the coils 72a and 72b and the yokes 73a and 73b. The lens barrel 3 may include coils 72a and 72b and yokes 73a and 73b, and the housing 4 may include magnets 71a and 71b. In the present embodiment, the second voice coil motor has been described in which the housing 4 has the magnets 74a and 74b and the bottom cover 6 has the coils 75a and 75b. 75a and 75b, and the bottom cover 6 may have magnets 74a and 74b.

  Although the present invention has been described with reference to the above-described embodiment and the like, the present invention is not limited to the above-described embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Camera module 2 Lens 3 Lens barrel 31 1st guide ball holding part 32 2nd guide ball holding part 33, 34 Recess 4 Housing 41 1st guide ball support part 42 2nd guide ball support part 43, 44 1st 1 concave portion 45, 46 second concave portion 47 excision portion 48 support guide ball receiving portion 5 cover 6 bottom cover 61 hooking portion 62 accommodating portions 71a, 71b, 74a, 74b
72a, 72b, 75a, 75b Coils 73a, 73b Yoke 76 Main guide ball 77 Sub guide ball 78 Support guide ball 79 Connection spring 8 FPC

Claims (10)

A lens barrel equipped with a lens;
Surrounding the lens barrel and housing the lens barrel;
A first voice coil motor that moves the lens barrel relative to the housing along an optical axis direction of the lens;
A first guide portion for guiding the movement of the lens barrel with respect to the housing;
With
The first voice coil motor includes a magnet on one of the housing and the lens barrel and a coil and a yoke on the other, and the lens barrel is moved to the first barrel by a magnetic force attracted to the magnet. Place the yoke to press against the guide part,
further,
A support cover for supporting the housing on one side of the lens;
A second voice coil motor that moves the housing in a direction perpendicular to the optical axis direction of the lens with respect to the support cover;
A second guide part disposed between the housing and the support cover, abutting the housing and the support cover, and guiding the movement of the housing relative to the support cover;
A connecting member for connecting the housing and the support cover;
With
The second voice coil motor includes a magnet on one of the housing and the support cover and a coil and a yoke on the other.
The connecting member is configured to connect with a constant distance between the housing and the support cover.
Lens drive device. The lens driving device according to claim 1,
The connecting member is configured to bias a force that pulls the housing and the support cover together through the second guide portion.
Lens drive device. The lens driving device according to claim 1 or 2,
The connecting member is configured to have flexibility with respect to a direction perpendicular to the optical axis direction of the lens.
Lens drive device. The lens driving device according to any one of claims 1 to 3,
The connecting member is constituted by a tension spring that biases a force that pulls the housing and the support cover together.
Lens drive device. The lens driving device according to any one of claims 1 to 4,
The second guide part is arranged at each position preset with respect to the support cover, and is composed of a plurality of spheres rotating at the respective arrangement positions.
Lens drive device. The lens driving device according to any one of claims 1 to 5,
The second voice coil motor is configured by two voice coil motors that respectively move the housing in two linear directions orthogonal to each other on a plane perpendicular to the optical axis direction of the lens.
Lens drive device. The lens driving device according to any one of claims 1 to 6,
The first voice coil motor is disposed at two adjacent sides of the substantially rectangular lens barrel,
The first guide portion is disposed at an intermediate position between the two first voice coil motors,
The yoke is arranged so as to press the lens barrel against the first guide portion by the resultant magnetic force of the yokes of the two first voice coil motors,
Lens drive device. The lens driving device according to claim 7,
The first guide portion includes a main guide portion disposed in the vicinity of a corner sandwiched between two adjacent sides of the substantially rectangular lens barrel in which the two first voice coil motors are disposed, and the main guide portion. A sub-guide portion disposed near another corner located diagonally to the corner of the lens barrel having a substantially rectangular shape in which the guide portion is disposed,
The yokes provided in each of the two first voice coil motors are configured such that magnetic forces attracted to the magnets are different from each other.
The sub-guide portion is configured to support pressing by the lens barrel that is biased to rotate about the main guide portion by a resultant force of the magnetic forces of the yokes of the two first voice coil motors. ing,
Lens drive device. The lens driving device according to claim 7 or 8,
The housing of the lens is used as the second voice coil motor in the vicinity of the other two sides different from the adjacent two sides of the substantially rectangular lens barrel in which the first voice coil motor is arranged. Two voice coil motors that are movable in two linear directions orthogonal to each other on a plane perpendicular to the optical axis direction are arranged.
Lens drive device. A camera module equipped with the lens driving device according to claim 1.