JP2022056738A - Camera module and electronic apparatus - Google Patents

Abstract

To provide a camera module with which it is possible to correct camera shake for even a large camera shake, while suppressing the degradation of picture quality or the breakage of members.SOLUTION: A camera module 1 comprises: a stationary member 2; a movable part 3 capable of moving to the stationary member 2 along an XY plane; a support part 4 for supporting the movable part 3 in such a way as to be capable of moving to the stationary member 2 along the XY plane; and an electromagnetic actuator 6 capable of moving the movable part 3 to the stationary member 2 by electromagnetic interaction. One electromagnetic actuator 6 includes a magnet 61 having a magnetic pole that is different along a direction Y and a coil 63 provided corresponding to the magnet 61, and another electromagnetic actuator includes a magnet 62 having a magnetic pole that is different along a direction X and a coil 65 provided corresponding to the magnet 62. The movable part 3 includes a base member 32, a sensor board 33 on which an imaging sensor 34 is mounted, and a lens unit 31 that includes at least one lens.SELECTED DRAWING: Figure 5

Description

The present invention relates to a camera module and an electronic device, and particularly relates to a camera module having a camera shake correction function.

Conventionally, a camera shake correction mechanism (lens shift type camera shake correction mechanism) that moves a specific lens in the camera lens according to the amount of camera shake in order to prevent the subject from blurring on the image pickup surface when camera shake occurs during shooting. ) Is known (see, for example, Patent Document 1).

Such a lens shift type image stabilization mechanism suppresses image shake on the imaging surface by moving a specific lens. Therefore, in order to correct large image shake, the diameter of the lens is used. Will need to be increased. However, if the diameter of the lens is increased, there is a problem that the image quality in the peripheral portion away from the optical axis is deteriorated. Further, when correcting for a large camera shake, a large force acts on the suspension wire holding the lens, and the suspension wire may be damaged.

Japanese Unexamined Patent Publication No. 2019-28288

The present invention has been made in view of the problems of the prior art, and is capable of performing image stabilization even for a large amount of camera shake while suppressing deterioration of image quality and damage to members. The purpose is to provide equipment.

According to the first aspect of the present invention, there is provided a camera module capable of performing image stabilization even for a large amount of camera shake while suppressing deterioration of image quality and damage to members. This camera module has a fixed portion, a movable portion that can move along the movable plane with respect to the fixed portion, and a support portion that supports the movable portion so as to be movable along the movable plane with respect to the fixed portion. And at least one electromagnetic actuator capable of moving the movable portion with respect to the fixed portion by electromagnetic interaction. The at least one electromagnetic actuator includes a magnet having different magnetic poles along one direction on the movable plane and a coil corresponding to the magnet. The movable portion includes a base member, a sensor substrate on which an image pickup sensor is mounted and fixed to the base member, and a lens unit which is a lens unit fixed to the base member and includes at least one lens. include.

According to the second aspect of the present invention, an electronic device including the above-mentioned camera module is provided.

FIG. 1 is a perspective view showing a camera module according to the first embodiment of the present invention. FIG. 2 is a front view of the main part of the camera module shown in FIG. FIG. 3 is a plan view of a main part of the camera module shown in FIG. FIG. 4 is an exploded perspective view of the movable portion of the camera module shown in FIG. FIG. 5 is a cross-sectional view taken along the line AA of FIG. FIG. 6 is an exploded perspective view showing a fixing member of the camera module shown in FIG. 1 and a member arranged on the fixing member. FIG. 7 is an exploded perspective view showing a movable portion of the camera module shown in FIG. 1 and a member attached to the movable portion. FIG. 8 is an exploded perspective view showing a lens unit of a movable portion of the camera module shown in FIG. 1. FIG. 9 is a front view showing a main part of the camera module according to the second embodiment of the present invention. FIG. 10 is an exploded perspective view of the camera module shown in FIG. FIG. 11 is a perspective view showing a camera module according to a third embodiment of the present invention. FIG. 12 is a front view of the main part of the camera module shown in FIG. FIG. 13 is an exploded perspective view of the movable portion of the camera module shown in FIG. FIG. 14 is an exploded perspective view showing a fixing member of the camera module shown in FIG. 11 and a member arranged on the fixing member. FIG. 15 is an exploded perspective view showing a movable portion of the camera module shown in FIG. 11 and a member attached to the movable portion. FIG. 16 is a perspective view showing a smartphone as an example of an electronic device in which the camera module according to the present invention is incorporated.

Hereinafter, embodiments of the camera module according to the present invention will be described in detail with reference to FIGS. 1 to 16. In FIGS. 1 to 16, the same or corresponding components are designated by the same reference numerals, and duplicate description will be omitted. Further, in FIGS. 1 to 16, the scale and dimensions of each component may be exaggerated or some components may be omitted. In the following description, unless otherwise noted, terms such as "first" and "second" are only used to distinguish the components from each other and represent a particular order or order. It's not a thing.

FIG. 1 is a perspective view showing a camera module 1 according to the first embodiment of the present invention. FIG. 2 is a front view showing a main part of the camera module 1 excluding the cover, and FIG. 3 is a plan view thereof. As shown in FIGS. 1 to 3, the camera module 1 in the present embodiment can move along the rectangular plate-shaped fixing member 2 (fixing portion) and the fixing member 2 along the XY plane (movable plane). It includes a movable portion 3, a support portion 4 that movably supports the movable portion 3 with respect to the fixing member 2 along an XY plane, and a box-shaped cover 5 that covers the movable portion 3 and the support portion 4. In the following embodiments, for convenience, the + Z direction is referred to as "up" or "upward", and the −Z direction is referred to as "down" or "downward".

FIG. 4 is an exploded perspective view of the movable portion 3. The movable portion 3 includes a lens unit 31 including at least one lens (not shown), a base member 32 of a rectangular plate, and a sensor substrate 33 fixed to the base member 32. As shown in FIG. 1, a circular lens opening 5A is formed in the center of the upper surface of the cover 5 corresponding to the lens of the lens unit 31 of the movable portion 3. Further, as shown in FIG. 4, an image pickup sensor 34 such as a CCD or a CMOS sensor is mounted on the sensor substrate 33. Further, an opening 32A is formed in the center of the base member 32 at a position corresponding to the image pickup sensor 34 on the sensor substrate 33, and a filter member 35 such as an IR cut filter is formed so as to close the opening 32A. It is arranged below the base member 32.

As shown in FIG. 4, a plurality of connection terminals 31A are formed in the lower portion of the lens unit 31, and contacts 33A are formed on the sensor substrate 33 corresponding to these connection terminals 31A. The connection terminal 31A of the lens unit 31 and the contact 33A of the sensor board 33 are electrically connected by, for example, solder 90 (see FIG. 1).

5 is a sectional view taken along the line AA of FIG. 3, and FIG. 6 is an exploded perspective view showing the fixing member 2 and the members arranged on the fixing member 2. As shown in FIGS. 5 and 6, four circular recesses 21 (first recesses) are formed in the corners of the upper surface 2A of the fixing member 2, and balls 41 are formed inside each recess 21. Is placed. Each ball 41 is movable inside the recess 21. These balls 41 and the recess 21 are arranged outside the sensor substrate 33 described above in the XY plane.

FIG. 7 is an exploded perspective view showing a movable portion 3 and a member attached to the movable portion 3. As shown in FIGS. 5 and 7, four cylindrical ball holding portions 36 extending downward (-Z direction) are formed on the lower surface 32B of the base member 32 of the movable portion 3, and these ball holding portions are formed. A recess 36A (second recess) is formed inside the portion 36 in the radial direction. These recesses 36A are arranged so as to face the recess 21 of the fixing member 2. Therefore, each ball 41 is located between the recess 21 of the fixing member 2 and the recess 36A of the ball holding portion 36 of the base member 32, and is the upper portion of the ball 41 arranged in the recess 21 of the fixing member 2 described above. Is accommodated in the recess 36A inside the ball holding portion 26 of the base member 32 of the movable portion 3. As a result, each ball 41 can move in the X direction and the Y direction between the recess 21 of the fixing member 2 and the recess 36A of the ball holding portion 26 of the base member 32. It is preferable to apply grease or gel to the inner surfaces of the recesses 21 and 36A in order to improve lubricity and durability or prevent oscillation.

With such a configuration, the movable portion 3 can move in the X direction and the Y direction with respect to the fixing member 2. That is, in the present embodiment, the movable portion 3 is XY plane with respect to the fixing member 2 by the concave portion 21 of the base member 32, the ball 41, and the concave portion 36A of the ball holding portion 36 of the base member 32 of the movable portion 3. A support portion 4 that is movablely supported along the (movable plane) is configured.

As shown in FIGS. 5 and 6, two rectangular recesses 22 long in the X direction and one rectangular recess 23 long in the Y direction are formed on the upper surface 2A of the peripheral edge portion of the fixing member 2. A magnet 61 is arranged inside the rectangular recess 22, and a magnet 62 is arranged inside the rectangular recess 23. In the present embodiment, each magnet 61 is magnetized so as to have different magnetic poles along the Y direction, for example, with the first portion 61A in which the upper surface is magnetized to the N pole and the lower surface is magnetized to the S pole. Includes a second portion 61B whose upper surface is magnetized to the S pole and whose lower surface is magnetized to the N pole. Further, in the present embodiment, the magnet 62 is magnetized so as to have different magnetic poles along the X direction, for example, with the first portion 62A in which the upper surface is magnetized to the N pole and the lower surface is magnetized to the S pole. Includes a second portion 62B whose upper surface is magnetized to the S pole and whose lower surface is magnetized to the N pole.

The first portion 61A and the second portion 61B of the magnet 61 may be integrally formed or may be composed of separate magnet pieces. In this case, a gap may be formed between the first portion 61A and the second portion 61B. Similarly, the first portion 62A and the second portion 62B of the magnet 62 may be integrally formed or may be composed of separate magnet pieces. In this case, a gap may be formed between the first portion 62A and the second portion 62B.

Further, as shown in FIGS. 5 and 7, three sets of projecting pieces 37 extending downward (in the −Z direction) are formed on the lower surface 32B of the base member 32 of the movable portion 3. Around each set of projecting pieces 37, coils 63 and 65 are arranged so as to face magnets 61 and 62 arranged in rectangular recesses 22 and 23 of the fixing member 2. Inside the coils 63 and 65, position detection sensors 64 and 66 that detect the position of the movable portion 3 by detecting the magnetic field generated by the magnet 61 or 62 are fixed by, for example, resin 67 (see FIG. 5). There is. As such position detection sensors 64 and 66, for example, a Hall sensor that detects a magnetic field by utilizing the Hall effect can be used.

Here, the magnet 61 and the coil 63 constitute an electromagnetic actuator 6 that moves the movable portion 3 with respect to the fixing member 2 in the Y direction by electromagnetic interaction. By energizing the coil 63, the magnet 61 and the coil are energized. The movable portion 3 can be moved in the Y direction by the electromagnetic interaction with 63. Further, the magnet 62 and the coil 65 constitute an electromagnetic actuator 6 that moves the movable portion 3 in the X direction with respect to the fixing member 2 by electromagnetic interaction. By energizing the coil 65, the magnet 62 and the coil 65 are energized. The movable portion 3 can be moved in the X direction by the electromagnetic interaction with the coil.

For example, by controlling the energization of the coils 63 and 65 according to the amount of camera shake based on a signal from a sensor such as a gyro sensor (not shown), the movable portion 3 is moved in the X direction and Y with respect to the fixing member 2. It can be moved in the direction to suppress blurring of the subject on the imaging surface. In particular, in the present embodiment, unlike the conventional lens shift type image stabilization mechanism, the entire movable portion 3 including the lens unit 31 including the lens and the sensor substrate 33 on which the image sensor 34 is mounted is moved to move the camera shake. Since the correction is performed, the positional relationship between the lens and the image sensor 34 does not change. Therefore, it is not necessary to increase the diameter of the lens even for a large amount of camera shake, and deterioration of image quality at the peripheral portion away from the optical axis is suppressed. Further, since a member such as a suspension wire is not required for camera shake correction, it is possible to prevent the member such as the suspension wire from being damaged when correcting a large camera shake.

In the present embodiment, the coils 63 and 65 are provided in the movable portion 3 and the magnets 61 and 62 are provided in the fixed member 2, but the magnets 61 and 62 are provided in the movable portion 3 and the coils 63 and 65 are provided in the fixed member 2. It may be provided. Further, the position detection sensors 64 and 66 may be provided on the fixing member 2.

Although not shown, it is preferable to fill a gel between the movable portion 3 and the fixing member 2 in order to prevent oscillation.

FIG. 8 is an exploded perspective view showing the lens unit 31 of the movable portion 3. As shown in FIG. 8, the lens unit 31 includes a lens frame 70 to which a lens (not shown) is fixed, a movable frame 71 that holds the lens frame 70 inside, and a base 72 that supports the movable frame 71. A cover body 73 that covers the lens frame 70 and the movable frame 71, a plurality of magnets 74 arranged inside the movable frame 71, and a coil 75 for moving the lens frame 70 in the Z direction are included. An opening 73A is formed in the center of the upper surface of the cover body 73.

The lens frame 70 is a cylindrical member having a threaded portion 70A to which a lens barrel (not shown) is attached, and is arranged inside the movable frame 71. A coil 75 is wound around the outer circumference of the lens frame 70.

The movable frame 71 is a cylindrical member having a square columnar shape, and a magnet holding portion 71A is formed inside the corner portion of the movable frame 71. The magnet 74 is held by the magnet holding portion 71A. A magnetic gap is formed between the magnet 74 arranged inside the movable frame 71 and the coil 75 arranged on the outer periphery of the lens frame 70.

The upper end of the lens frame 70 and the upper end of the movable frame 71 are connected by a leaf spring 76A, and the lower end of the lens frame 70 and the lower end of the movable frame 71 are connected by a leaf spring 76B. By these leaf springs 76A and 76B, the lens frame 70 is elastically held in the movable frame 71 in a state of being movable along the Z direction.

As described above, in the present embodiment, the lens frame 70 is supported so as to be movable in the Z direction with respect to the movable frame 71, and when the coil 75 is energized, the lens is caused by the electromagnetic interaction between the magnet 74 and the coil 75. The frame 70 can be moved in the Z direction. By energizing the coil 75 in this way, the lens frame 70 can be moved in the Z direction, and for example, an autofocus function can be realized.

The movable frame 71 is movably held with respect to the base 72 via a support wire 77 extending in the Z direction. One end of the support wire 77 is fixed to a wiring member (not shown) provided on the base 72, and the other end is fixed to a leaf spring 76A attached to the movable frame 71. In this way, the movable frame 71 is supported in a state of being suspended by the support wire 77, and can move in the X direction and the Y direction due to the bending of the support wire 77. A part of the support wire 77 is electrically connected to the coil 75 via the leaf spring 76A, and the coil 75 is energized via the support wire 77.

An opening 72A for passing light transmitted through the lens is formed in the center of the base portion 72, and a stopper 72B extending in the + Z direction is formed at a corner portion of the base portion 72. The stopper 72B restricts the movement of the movable frame 71 in the X direction and the Y direction. Further, the above-mentioned connection terminal 31A is formed in the lower part of the base portion 72.

Further, a coil 78 is attached to the base 72. The coil 78 is electrically connected to the connection terminal 31A, and the coil 78 is energized via the connection terminal 31A. By energizing the coil 78, the movable frame 71 can be moved in the X and Y directions on the XY plane by the electromagnetic interaction between the magnet 74 and the coil 78. In the present embodiment, the two coils 78 are attached to the base 72, but the position and number of the coils 78 are not limited to this.

As described above, in the present embodiment, the magnet 74 and the coil 78 constitute a lens moving mechanism in which the movable frame 71 (and the lens inside the movable frame 71) can be moved along the XY plane by electromagnetic interaction. Therefore, for example, by controlling the energization of the coil 78 according to the amount of camera shake based on a signal from a sensor such as a gyro sensor (not shown), the movable frame 71 is caused by the electromagnetic interaction between the magnet 74 and the coil 78. It is possible to suppress the blurring of the subject on the image pickup surface by moving the lens inside the lens in the X direction and the Y direction. Note that such a lens moving mechanism is not limited to one that utilizes the electromagnetic interaction of a VCM (Voice Coil Motor), and may use an SMA (Shape Memory Alloy) as a drive source. Further, as the support method of the lens moving mechanism, for example, a guide shaft or a rotating body (ball) may be used instead of the wire.

Here, as described above, the camera shake can be corrected by the electromagnetic actuator 6 (coil 63 and magnet 61 and coil 65 and magnet 62) provided outside the lens unit 31, but the lens unit 31 also has the above. By adding a lens moving mechanism such as the above, by using this lens moving mechanism as a lens shift type image stabilization mechanism, the range in which image stabilization is possible can be further increased. Further, for example, when it is necessary to move the lens at high speed, the lens moving mechanism inside the lens unit 31 is used, and when it is necessary to move the lens over a long distance, the electromagnetic actuator 6 outside the lens unit 31 is used. As described above, the lens moving mechanism inside the lens unit 31 and the electromagnetic actuator 6 outside the lens unit 31 may be used properly according to the required performance to correct camera shake so that the optical characteristics are further improved.

The lens unit 31 in the present embodiment has both the functions of image stabilization and autofocus, but the lens unit 31 of the other embodiment has only one function of image stabilization or autofocus. It may be the one which has or does not have any function.

In the present embodiment, the support portion 4 that movably supports the movable portion 3 with respect to the fixing member 2 along the XY plane includes the recess 21 of the fixing member 2 and the recess 36A of the ball holding portion 36 of the movable portion 3. Although an example of being composed of a ball 41 held between the recess 21 and the recess 36A has been described, the support portion 4 is not limited to such a configuration, and for example, a suspension wire, a guide shaft, or the like is used. It is also possible to realize the support portion 4.

Further, in the present embodiment, the coils 63 and 65 are fixed to the base member 32 of the movable portion 3, but these coils 63 and 65 may be fixed to the sensor substrate 33. A second embodiment as an example of such a configuration is shown in FIGS. 9 and 10. 9 is a front view showing a main part of the camera module 101 in the second embodiment, and FIG. 10 is an exploded perspective view.

The base member 132 in the present embodiment is the same as the base member 32 in the first embodiment except that it does not have a protruding piece 37 on the lower surface. Further, the sensor substrate 133 in the present embodiment is the first embodiment except that it has an extension portion 133B extending in both directions in the Y direction and an extension portion 133C extending in the + X direction. It is the same as the sensor board 33 in the form.

A coil 63 and a position detection sensor 64 are mounted or connected by wiring to the extension portion 133B of the sensor board 133. Further, a coil 65 and a position detection sensor 66 are mounted or connected by wiring to the extension portion 133C of the sensor board 133. These coils 63, 65 and the position detection sensors 64, 66 are fixed to the extending portions 133B, 133C of the sensor substrate 133, for example, by a resin (not shown).

In the present embodiment, as shown in FIGS. 9 and 10, the entire magnet 61 is embedded in the rectangular recess 22 of the fixing member 2 so that the magnet 61 does not interfere with the coil 63 provided on the sensor substrate 133. There is. Similarly, the entire magnet 62 is embedded in the rectangular recess 23 of the fixing member 2 so that the magnet 62 does not interfere with the coil 65 provided on the sensor substrate 133.

In the present embodiment, the coils 63 and 65 are provided on the sensor board 133 of the movable portion 103 and the magnets 61 and 62 are provided on the fixing member 2, but the magnets 61 and 62 are provided on the sensor board 133 of the movable portion 103 and the coils are provided. 63, 65 may be provided in the fixing member 2. Further, the position detection sensors 64 and 66 may be provided on the fixing member 2.

Although not shown, it is preferable to fill a gel between the movable portion 103 and the fixing member 2 in order to prevent oscillation.

FIG. 11 is a perspective view showing the camera module 201 according to the third embodiment of the present invention, and FIG. 12 is a front view of a main part of the camera module 201. As shown in FIGS. 11 and 12, the camera module 201 in the present embodiment includes a rectangular plate-shaped fixing member 202 (fixing portion), a movable portion 203 that can rotate with respect to the fixing member 202 on an XY plane, and a movable portion 203. It includes a support portion 204 that rotatably supports the movable portion 203 with respect to the fixing member 202 on an XY plane.

FIG. 13 is an exploded perspective view of the movable portion 203. As shown in FIG. 13, the movable portion 203 includes the above-mentioned lens unit 31, the base member 232 of the rectangular plate, the sensor substrate 33, and the filter member 35. The sensor board 33 is fixed to the base member 232.

FIG. 14 is an exploded perspective view showing the fixing member 202 and the members arranged on the fixing member 202. As shown in FIG. 14, at the four corners of the upper surface 202A of the fixing member 202, a ball holding portion 221 having an arcuate groove portion 221A (first arcuate groove portion) extending in an arc shape on the XY plane is formed. Each is formed. Balls 41 are arranged in the arcuate groove portion 221A of each ball holding portion 221, and each ball 41 is movable inside the arcuate groove portion 221A. The arcuate groove portion 221A preferably has a V-shaped cross section so as to come into contact with the ball 41 at two points. These balls 41 and the ball holding portion 221 are arranged outside the sensor substrate 33 in the XY plane.

Two rectangular recesses 222 long in the X direction are formed on the upper surface 202A of both edges of the fixing member 202 in the Y direction. A magnet 261 is arranged inside each rectangular recess 222. In the present embodiment, each magnet 261 is composed of two magnet pieces 261A and 261B in which different magnetic poles are arranged so as to be adjacent to each other in the X direction, whereby the magnet 261 has different magnetic poles along the X direction. have. For example, the upper surface of the magnet piece 261A is magnetized to the N pole and the lower surface is magnetized to the S pole, and the upper surface of the magnet piece 261B is magnetized to the S pole and the lower surface is magnetized to the N pole.

FIG. 15 is an exploded perspective view showing a movable portion 203 and a member attached to the movable portion 203. As shown in FIG. 15, four ball holding portions 236 extending downward (-Z direction) are formed on the lower surface 232B of the base member 232 of the movable portion 203, and inside these ball holding portions 236. An arcuate groove portion 236A (second arcuate groove portion) extending in an arc shape is formed on the XY plane. These arcuate groove portions 236A are arranged so as to face the arcuate groove portion 221A of the fixing member 202. Therefore, each ball 41 is located between the ball holding portion 221 of the fixing member 202 and the ball holding portion 236 of the base member 232, and is arranged in the arcuate groove portion 221A of the ball holding portion 221 of the fixing member 202 described above. The upper portion of the ball 41 is accommodated in the arcuate groove portion 236A inside the ball holding portion 236 of the base member 232 of the movable portion 203. As a result, each ball 41 can move along the arc between the arc-shaped groove portion 221A of the fixing member 202 and the arc-shaped groove portion 236A of the base member 232. The arcuate groove portion 236A preferably has a V-shaped cross section so as to come into contact with the ball 41 at two points. It is preferable to apply grease or gel to the inner surfaces of the arcuate grooves 221A and 236A in order to improve lubricity and durability or prevent oscillation.

With such a configuration, the movable portion 203 can rotate with respect to the fixing member 202. That is, in the present embodiment, the movable portion 203 is XY plane with respect to the fixing member 202 by the ball holding portion 221 of the base member 232, the ball 41, and the ball holding portion 236 of the base member 232 of the movable portion 203. A support portion 204 that rotatably supports along the movable plane) is configured.

Further, as shown in FIG. 15, two sets of projecting pieces 237 extending downward (in the −Z direction) are formed on the lower surface 232B of the base member 232 of the movable portion 203. Around the protruding pieces 237 of each set, a coil 263 is arranged so as to face the magnet 261 arranged in the rectangular recess 222 of the fixing member 202. Inside each coil 263, a position detection sensor 264 that detects the position (rotation angle) of the movable portion 203 by detecting the magnetic field generated by the magnet 261 is fixed, for example, by resin. As such a position detection sensor 264, for example, a Hall sensor that detects a magnetic field by utilizing the Hall effect can be used.

Here, the magnet 261 and the coil 263 constitute an electromagnetic actuator 6 that moves the movable portion 203 with respect to the fixing member 202 along the XY plane by electromagnetic interaction, and the magnet 261 is energized by energizing the coil 263. A force along the X direction can be applied to the movable portion 203 by the electromagnetic interaction between the coil 263 and the coil 263. The force along the X direction is converted into a rotational force by the support portion 204 described above and acts on the movable portion 203. As a result, the movable portion 203 rotates along the XY plane.

For example, by controlling the energization of the coil 263 according to the amount of camera shake based on a signal from a sensor such as a gyro sensor (not shown), the movable portion 203 is rotated on the XY plane with respect to the fixing member 202. It is possible to suppress blurring (rotational blurring) of the subject on the imaging surface. In principle, the conventional lens shift type image stabilization mechanism cannot correct rotational shake, but in the present embodiment, the movable portion 203 is moved on the XY plane with respect to the fixed member 202 according to the amount of rotational shake. Rotational shake can be corrected by rotating. In particular, by combining with the lens unit 31 including the above-mentioned camera shake correction mechanism, the camera module 201 in the present embodiment can correct both camera shake and rotational shake of movement along the XY plane.

In the present embodiment, the coil 263 is provided in the movable portion 203 and the magnet 261 is provided in the fixed member 202, but the magnet 261 may be provided in the movable portion 203 and the coil 263 may be provided in the fixed member 202. Further, the position detection sensor 264 may be provided on the fixing member 202.

In the present embodiment, the support portion 204 that rotatably supports the movable portion 203 with respect to the fixed member 202 on the XY plane is the arcuate groove portion 221A of the ball holding portion 221 of the fixing member 202 and the ball holding of the movable portion 203. An example of being composed of an arcuate groove portion 236A of the portion 236 and a ball 41 held between the arcuate groove portion 221A and the arcuate groove portion 236A has been described, but the support portion 204 has such a configuration. Not limited to this, the support portion 204 can also be realized by using, for example, a suspension wire or a guide shaft.

In the above-described embodiment, an example in which a hall sensor is used as the position detection sensor 64, 66, 264 has been described, but the position detection sensor 64, 66, 264 is not limited to the hall sensor, and the position detection sensor 64, 66, 264 is not limited to the hall sensor, for example, a magnetic resistance sensor or a photo. Sensors such as interrupters and encoders can be used as position detection sensors 64, 66, 264.

FIG. 16 shows a smartphone 300 as an example of an electronic device in which the camera modules 1, 101, 201 described in the above-described embodiment are incorporated. On the back surface of the smartphone 300, a window 303 for allowing light to enter the lens of the lens unit described above is formed. In this case, the cover 5 of the camera modules 1, 101, 201 described above may also serve as an exterior component of the smartphone 300.

The camera module according to the present invention is not limited to such a smartphone 300, but can be applied to various electronic devices such as tablet computers, laptop computers, drones, surveillance cameras, and in-vehicle cameras.

Further, a plurality of the above-mentioned camera modules may be incorporated in one electronic device. In this case, by performing image stabilization with an electromagnetic actuator 6 provided outside the lens unit 31, it is possible to make the positional relationship between the lens and the image pickup sensor constant among the plurality of camera modules. Therefore, for example, it is possible to reduce the influence of camera shake in shooting as a 3D camera or distance measurement by parallax.

Although the preferred embodiment of the present invention has been described so far, it is needless to say that the present invention is not limited to the above-described embodiment and may be implemented in various different forms within the scope of the technical idea.

As described above, according to the first aspect of the present invention, there is provided a camera module capable of performing image stabilization even for a large amount of camera shake while suppressing deterioration of image quality and damage to members. This camera module has a fixed portion, a movable portion that can move along the movable plane with respect to the fixed portion, and a support portion that supports the movable portion so as to be movable along the movable plane with respect to the fixed portion. And at least one electromagnetic actuator capable of moving the movable portion with respect to the fixed portion by electromagnetic interaction. The at least one electromagnetic actuator includes a magnet having different magnetic poles along one direction on the movable plane and a coil corresponding to the magnet. The movable portion includes a base member, a sensor substrate on which an image pickup sensor is mounted and fixed to the base member, and a lens unit which is a lens unit fixed to the base member and includes at least one lens. include.

According to such a configuration, by energizing the coil of the electromagnetic actuator according to the amount of camera shake, the movable part can be moved along the movable plane with respect to the fixed part to correct the camera shake. At this time, unlike the conventional lens shift type image stabilization mechanism, the moving part including the lens unit including the lens and the sensor substrate on which the image pickup sensor is mounted is integrally moved to perform image stabilization, so that large image stabilization is performed. It is not necessary to increase the diameter of the lens in order to correspond to the amount, and the deterioration of the image quality at the peripheral portion away from the optical axis is suppressed. Further, since a member such as a suspension wire is not required for camera shake correction, it is possible to prevent the member such as the suspension wire from being damaged when correcting a large camera shake.

The at least one electromagnetic actuator includes a first electromagnetic actuator configured to move the movable portion with respect to the fixed portion along a first direction along the movable plane by electromagnetic interaction. You may. Further, the at least one electromagnetic actuator causes the movable portion to move with respect to the fixed portion in a second direction perpendicular to the first direction and along the movable plane by electromagnetic interaction. A second electromagnetic actuator to be configured may be further included.

The support portion is formed in the fixed portion and has a plurality of first arc-shaped groove portions extending in an arc shape on the movable plane, and a plurality of first arc-shaped grooves formed in the movable portion and extending in an arc shape on the movable plane. It may include the arcuate groove portion of 2. The plurality of second arcuate groove portions are arranged so as to face the plurality of first arcuate groove portions. Further, the support portion may further include a plurality of balls held between the first arcuate groove portion and the second arcuate groove portion. By driving the first electromagnetic actuator by such a support portion, the force acting on the movable portion is converted into a rotational force, so that the movable portion can be rotated with respect to the fixed portion.

The support portion may include a plurality of first recesses formed in the fixed portion and a plurality of second recesses formed in the movable portion. The plurality of second recesses are arranged so as to face the plurality of first recesses. Further, the support portion may further include a plurality of balls held between the first recess and the second recess.

The lens unit of the movable portion may include a lens moving mechanism capable of moving at least one lens along the movable plane. With such a lens moving mechanism, the range in which image stabilization is possible can be further increased.

According to the second aspect of the present invention, an electronic device including the above-mentioned camera module is provided.

1,101,201 Camera module 2,202 Fixing member (fixing part)
3,103,203 Movable part 4,204 Support part 5 Cover 6 Electromagnetic actuator 10 Fixing member 21 (1st) recess 26 Ball holding part 31 Lens unit 32,132,232 Base member 33,133 Sensor board 34 Image sensor 36 Ball holder 36A (second) recess 37,237 Projection piece 41 Ball 61,62,261 Magnet 63,65,263 Coil 64,66,264 Position detection sensor 70 Lens frame 71 Movable frame 72 Base 73 Cover body 74 Magnet 75,78 Coil 77 Support wire 221 Ball holding part 221A (1st) arcuate groove part 236 Ball holding part 236A (2nd) arcuate groove part

Claims (7)

Fixed part and
A movable part that can move along a movable plane with respect to the fixed part,
A support portion that movably supports the movable portion with respect to the fixed portion along the movable plane, and a support portion.
It is provided with at least one electromagnetic actuator capable of moving the movable portion with respect to the fixed portion by electromagnetic interaction.
The at least one electromagnetic actuator
A magnet having different magnetic poles along one direction on the movable plane,
Including the coil provided corresponding to the magnet
The movable part is
With the base member
A sensor board on which an image pickup sensor is mounted and fixed to the base member,
A lens unit fixed to the base member, which includes a lens unit including at least one lens.
The camera module. The at least one electromagnetic actuator includes a first electromagnetic actuator configured to move the movable portion with respect to the fixed portion along a first direction along the movable plane by electromagnetic interaction. The camera module according to claim 1. The at least one electromagnetic actuator is configured to move the movable portion perpendicular to the fixed portion and along the second direction along the movable plane by electromagnetic interaction. The camera module according to claim 2, further comprising a second electromagnetic actuator. The support portion is
A plurality of first arc-shaped groove portions formed in the fixed portion and extending in an arc shape on the movable plane,
A plurality of second arc-shaped groove portions formed in the movable portion and extending in an arc shape on the movable plane, and a plurality of second circles arranged to face the plurality of first arc-shaped groove portions. Arc-shaped groove and
The camera module according to claim 2, further comprising a plurality of balls held between the first arcuate groove portion and the second arcuate groove portion. The support portion is
A plurality of first recesses formed in the fixing portion,
A plurality of second recesses formed in the movable portion, the plurality of second recesses arranged facing the plurality of first recesses, and a plurality of second recesses.
The camera module according to any one of claims 1 to 3, comprising a plurality of balls held between the first recess and the second recess. The camera module according to any one of claims 1 to 5, wherein the lens unit of the movable portion includes a lens moving mechanism capable of moving the at least one lens along the movable plane. An electronic device comprising the camera module according to any one of claims 1 to 6.

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