Drive device

Abstract

To provide a drive device which has improved responsiveness exhibiting when driving a driven body, and furthermore in which space for insertion of wiring can be secured.SOLUTION: The drive device comprises: a stationary portion; a first movable portion which is held by the stationary portion rotatably around a first shaft; and a second movable portion which is held by the first movable portion rotatably around a second shaft different from the first shaft. The drive device includes a bearing which supports the first movable portion rotatably around the first shaft with respect to the stationary portion; first wiring which is connected at one end thereof to the stationary portion and connected at other end thereof to the first movable portion; and second wiring which is connected at one end thereof to the stationary portion and connected at other end thereof to either the first movable portion or the second movable portion. The first wiring includes a winding which is wound around the first shaft, wherein the winding is disposed at radial outside of the bearing, and the second wiring is inserted into the inside of the bearing.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a drive device in which a movable part rotates relative to a fixed part. [Background technology]

[0002] In recent years, small cameras known as action cameras and wearable cameras have become popular. Among these cameras, cameras that can freely change the shooting range by rotating the camera unit horizontally and vertically have been developed, and these cameras are also used in drones (unmanned aerial vehicles) and surveillance cameras.

[0003] Patent Document 1 discloses an imaging device that has a support part that supports a driven body and a base part, and the base part rotatably supports the support part by fitting a shaft part provided on the support part into a hole part provided on the base part. Also, the imaging device described in Patent Document 1 has a configuration in which wiring drawn from the driven body is inserted into a hollow part of the shaft part and connected to a control board provided on the base part. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2018-205495 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the imaging device of Patent Document 1, there is play in the fitting portion between the shaft and the hole, which reduces responsiveness when driving the driven body. If an attempt is made to improve this by using a bearing to support the rotation of the support part, the bearing would have to be installed in the opening where the wires were inserted, and there would be no space to insert the wires.

[0006] The present invention provides a drive device that can secure space for inserting wires while improving responsiveness when driving a driven body. [Means for solving the problem]

[0007] A driving device according to one aspect of the present invention is a driving device comprising: a fixed part; a first movable part rotatably held around a first axis relative to the fixed part; and a second movable part rotatably held around a second axis different from the first axis relative to the first movable part, wherein the driving device has a bearing that rotatably supports the first movable part around the first axis relative to the fixed part; a first wiring having one end connected to the fixed part and the other end connected to the first movable part; and a second wiring having one end connected to the fixed part and the other end connected to either the first movable part or the second movable part, wherein the first wiring includes a winding part wound around the first axis, the winding part being provided on the outside of the bearing in the radial direction of the bearing, and the second wiring being inserted inside the bearing.

[0008] Other objects and features of the present invention will be described in the following embodiments. [Effects of the Invention]

[0009] According to the present invention, it is possible to ensure space for inserting wires while improving response when driving a driven body. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 2 is an exploded perspective view of the rotation drive device according to the first embodiment. [Figure 2] 1A and 1B are a front view and a side view of a rotation drive device according to a first embodiment. [Figure 3] 1 is a cross-sectional view of a rotation drive device according to a first embodiment. [Figure 4] 1A and 1B are an exploded perspective view and a cross-sectional view of a vibration wave motor according to a first embodiment. [Figure 5]FIG. 2 is a detailed cross-sectional view of the rotation drive device according to the first embodiment. [Figure 6] 1 is a cross-sectional view of a rotation drive device according to a first embodiment. [Figure 7] FIG. 2 is a diagram showing a configuration different from that of the rotation drive device of the first embodiment. [Figure 8] FIG. 10 is a cross-sectional view of a conventional rotary drive device. [Figure 9] FIG. 10 is a perspective view of an electromagnetic motor of a rotary drive device according to a second embodiment. [Figure 10] FIG. 10 is a cross-sectional view of a rotation drive device according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same components, and redundant explanations will be omitted. (First embodiment) A rotation drive device (drive device) 100 according to a first embodiment of the present invention will be described below.

[0012] First, the overall configuration of a rotary drive device 100 according to the first embodiment will be described. FIG. 1 is an exploded perspective view of the rotary drive device 100. FIG. 2(a) is a front view of the rotary drive device 100, and FIG. 2(b) is a side view of the rotary drive device 100. FIG. 3 is a cross-sectional view of the rotary drive device 100, with FIG. 3(a) being a cross-sectional view taken along line AA in FIG. 2(b) and FIG. 3(b) being a cross-sectional view taken along line BB in FIG. 2(a). The rotary drive device 100 includes a fixed part 110, a first movable part 120, and a second movable part 130. The first movable part 120 is held by the fixed part 110 so as to be rotatable about the Y-axis (first axis) relative to the fixed part 110, and the second movable part 130 is held by the first movable part 120 so as to be rotatable about the X-axis (second axis different from the first axis) relative to the first movable part 120. The rotational support mechanism will be described later.

[0013] The fixed part 110 is provided with a first oscillatory wave motor (first drive part) 140, and the first movable part 120 is driven to rotate around the Y-axis relative to the fixed part 110 by the driving force generated by the first oscillatory wave motor 140. Similarly, the first movable part 120 is provided with a second oscillatory wave motor (second drive part) 150, and the second movable part 130 is driven to rotate around the X-axis relative to the first movable part 120 by the driving force generated by the second oscillatory wave motor 150. As a result, the second movable part 130 can be driven to rotate around both the Y-axis and the X-axis relative to the fixed part 110 by the driving forces of the first oscillatory wave motor 140 and the second oscillatory wave motor 150.

[0014] The rotary drive device 100 is an imaging device equipped with an imaging element 18, and the second movable part 130 is equipped with a lens 17 and the imaging element 18, and is capable of capturing an image of a subject. As described above, the second movable part 130 can rotate around the X-axis and the Y-axis, and therefore can capture images of a subject in various directions.

[0015] Next, the rotation drive mechanism of the second movable part 130 in this embodiment will be described. The second movable part 130 has a second rotating member 19, which has an imaging board 16 equipped with an imaging element 18 and a lens 17. For simplicity, the lens 17 is illustrated as a single lens here, but in reality, the lens 17 is an imaging optical system made up of multiple lenses. Furthermore, the imaging optical system may have lenses that can be driven by a drive device (not shown), and may have autofocus and vibration reduction functions.

[0016] The first movable part 120 has a holding metal plate 21, which is a U-shaped sheet metal member, and the holding metal plate 21 is equipped with a pivot support member 20. The pivot support member 20 is provided with a hole 20a, which engages with a shaft 19a of the second rotating member 19. As a result, the second rotating member 19 is fixed to the holding metal plate 21 via the pivot support member 20. Due to the engagement between the shaft 19a and the hole 20a, the second rotating member 19 is supported rotatably about the X-axis relative to the holding metal plate 21. In other words, the second movable part 130 is supported by the first movable part 120 so as to rotate about the X-axis relative to the first movable part 120.

[0017] The first movable part 120 is provided with a second vibration wave motor 150 for rotationally driving the second movable part 130. Figure 4 shows the configuration of the second vibration wave motor 150 of the rotation drive device 100, with Figure 4(a) being an exploded perspective view of the second vibration wave motor 150 and Figure 4(b) being a cross-sectional view taken along CC in Figure 2(a).

[0018] The vibrator 1 is composed of a diaphragm 2 and a piezoelectric element 3. The diaphragm 2 is a plate-like member with two protrusions, and the diaphragm 2 and the piezoelectric element 3 are fixed together by means of an adhesive or the like. A high-frequency signal is supplied to the piezoelectric element 3 from a motor FPC 4 connected to the piezoelectric element 3, causing the piezoelectric element 3 to expand and contract (flexible printed circuit boards are abbreviated as FPCs in this specification). The expansion and contraction of the piezoelectric element 3 generates bending deformation in the vibrator 1. The occurrence of a predetermined bending deformation in the vibrator 1 generates elliptical motion at the tips of the protrusions of the vibrator 1.

[0019] The pressure spring 7 presses the vibrator 1 against the second friction member 23 fixed to the second rotating member 19 via the pressure plate 6 and the buffer member 5. The pressure plate 6 allows the pressure force of the pressure spring 7 to be applied uniformly to the vibrator 1, rather than locally. By providing the buffer member 5 between the vibrator 1 and the pressure plate 6, it is possible to prevent attenuation of the vibration of the vibrator 1 due to direct contact between the pressure plate 6 and the vibrator 1. With the vibrator 1 pressed against the second friction member 23 by the pressure spring 7, a high-frequency signal is input to the piezoelectric element 3, generating the elliptical motion described above. This generates a frictional force between the vibrator 1 and the second friction member 23, and this frictional force causes the vibrator 1 and the second friction member 23 to move relative to each other.

[0020] The vibrator 1 is fixed to the base 8 by adhesive means (not shown) or the like. The base 8 and the holding member 9 are connected via a connecting member 10. The connecting member 10 is a plate-shaped member that is flexible in the pressure direction of the vibrator 1 and is configured to have high rigidity in a direction perpendicular to the pressure direction. The pressure receiving member 11 is a member that receives the pressure reaction force of the pressure spring 7, and both the connecting member 10 and the pressure receiving member 11 are fixed to the holding metal plate 21. As described above, since the connecting member 10 is flexible in the pressure direction of the vibrator 1, the connecting member 10 deforms when a positional error in the pressure direction occurs between the vibrator 1 and the second friction member 23. This makes it possible to absorb the positional error in the pressure direction.

[0021] Furthermore, because the vibrator 1 is fixed to the holding plate 21 via the connecting member 10 and the holding member 9, even when a driving force is generated between the vibrator 1 and the second friction member 23, the vibrator 1 is held without moving in a direction perpendicular to the pressure direction due to a reaction force. The driving force described above acts on the second friction member 23 in the Z direction. The second rotating member 19 to which the second friction member 23 is fixed is supported rotatably about the X axis relative to the holding plate 21, so that the second friction member 23 and the second rotating member 19 are rotationally driven about the X axis by the driving force generated in the Z direction.

[0022] The second rotating member 19 and the holding metal plate 21 are provided with a second scale 27 and a second sensor (position detection means) 25, respectively, and the second sensor 25 can detect the position of the second scale 27 of the second movable part 130. This makes it possible to detect the amount of rotation of the second rotating member 19 relative to the holding metal plate 21. The second sensor 25 outputs an electrical signal corresponding to the position of the second scale 27, and by reading this signal, the position of the second scale 27 can be detected. A sensor FPC 25a of the second sensor 25 is electrically connected to a wound FPC (first wiring) 13 (described later) by a connecting means (not shown). The first rotating member 28 and the fixed metal plate 33 are provided with a first scale 26 and a first sensor 24, respectively, and the position of the first scale 26 can be detected by the first sensor 24. This makes it possible to detect the amount of rotation of the first rotating member 28 relative to the fixed metal plate 33. Furthermore, the first sensor 24 outputs an electrical signal according to the position of the first scale 26, and by reading this signal, the position of the first scale 26 can be detected. The sensor FPC 24a of the first sensor 24 is electrically connected to the control board 15 by a connecting means (not shown).

[0023] Next, the rotation drive mechanism of the first movable part 120 in this embodiment will be described. FIG. 5 is an enlarged detailed view of region E in FIG. 3(b). The bearing 12 is a member that rotatably supports the first movable part 120 with respect to the fixed part 110. The first movable part 120 has two bearings 12, which are shown as bearings 12-1 and 12-2. The fixed part 110 includes a fixed member 32, to which a fixed metal plate 33 is fixed. A bearing holding member 30 is provided on the fixed metal plate 33, and outer rings 12-1a and 12-2a of the two bearings 12-1 and 12-2 are engaged with engaging portions 30a and 30b of the bearing holding member 30, respectively. The outer rings 12-1a and 12-2a of the bearings 12-1 and 12-2 are configured to come into contact with receiving surfaces 30c and 30d of the bearing holding member 30, respectively. Bearing 12 is composed of inner ring 12b having a first rolling surface, outer ring 12a having a second rolling surface that is located radially outward of inner ring 12b, and balls 12c located between the first and second rolling surfaces. Balls 12c roll between the first and second rolling surfaces, allowing outer ring 12a and inner ring 12b to rotate smoothly without sliding against each other.

[0024] The first movable part 120 includes a first rotating member 28, to which a retaining metal plate 21 is fixed, and which rotatably supports a second movable part 130. The first rotating member 28 includes a hollow member 29 having a hollow portion formed therein, and a cylindrical portion 29a of the hollow member 29 engages (fits) with the inner ring 12b of the bearing 12. A threaded portion 29b is provided at the tip of the hollow member 29, and is threadedly engaged with a threaded portion 31a provided on the inside of a bearing fixing member 31. The bearing fixing member 31 abuts against the inner ring 12-1b of the bearing 12-1, and a preload is applied to the inner ring 12-1b by tightening the bearing fixing member 31 to the hollow member 29 with a predetermined force.

[0025] The inner ring 12-2b of the bearing 12-2 abuts against the receiving surface 28a of the first rotating member 28, and the inner ring 12-2b and the first rotating member 28 are configured to move integrally. The preload applied by the bearing fixing member 31 acts on the bearing holding member 30 via the bearing 12-1, the bearing holding member 30, the bearing 12-2, and the first rotating member 28. As described above, the bearing fixing member 31 and the hollow member 29 are threadedly engaged, and therefore the preload is closed between the bearing fixing member 31 and the hollow member 29. A preload also acts between the outer ring 12a and the inner ring 12b of each of the two bearings 12 in the Y direction, which is the rotational axis direction, to eliminate backlash between the outer ring 12a and the inner ring 12b.

[0026] Although the configuration has been described in which the inner ring 12-2b of the bearing 12-2 abuts against the first rotating member 28, the inner ring 12-2b may be in direct contact with the bearing holding member 30 so that no preload is applied to the first rotating member 28. Furthermore, in this embodiment, a fixed-position preload system has been described in which preload is applied to the bearing 12 by the tightening force of the bearing fixing member 31, but a constant-pressure preload system in which preload is applied by a spring or the like may also be used.

[0027] The outer ring 12a of the bearing 12 is fixed to a fixed metal plate 33 via a bearing holding member 30, and the inner ring 12b is configured to move integrally with the first rotating member 28. That is, the inner ring 12b is fixed to the first movable part 120, and the outer ring 12a is fixed to the fixed part 110. With this configuration, the first movable part 120 including the first rotating member 28 is supported by the fixed part 110 including the fixed metal plate 33 so as to rotate around the Y axis relative to the fixed part 110.

[0028] The fixed part 110 is provided with a first vibration wave motor 140 for rotationally driving the first movable part 120. The configuration of the first vibration wave motor 140 is similar to that of the second vibration wave motor 150 described above, and therefore a description thereof will be omitted.

[0029] A first friction member 22 is provided on the first rotating member 28, and a driving force in the Z-axis direction is applied to the first rotating member 28 by the friction force between the vibrator 1 of the first vibration wave motor 140 and the first friction member 22 of the first rotating member 28. Since the first rotating member 28 is supported by the fixed metal plate 33 so as to rotate around the Y-axis relative to the fixed metal plate 33, the driving force of the first vibration wave motor 140 drives the first rotating member 28 to rotate around the Y-axis.

[0030] As described above, in the first embodiment, the first movable part 120 is driven to rotate around the Y axis relative to the fixed part 110 by the first vibration wave motor 140. The second movable part 130 is driven to rotate around the X axis relative to the first movable part 120 by the second vibration wave motor 150. This makes it possible to capture images of subjects in various directions by rotating the lens 17 and the image sensor 18 provided on the second movable part 130 around two orthogonal axes.

[0031] Next, the wiring arrangement of the first embodiment will be described. Figure 6 is a cross-sectional view of the rotary drive device 100, taken along line DD in Figure 2(a).

[0032] The control board 15 is equipped with a CPU, memory, etc. that perform image processing, and also has a driver IC that controls the driving of the first vibration wave motor 140 and the second vibration wave motor 150. The control board 15 is fixed to a fixing member 32 provided on the fixing unit 110. Note that in this embodiment, the control board 15 is illustrated as a single board, but it may be configured as being divided into multiple boards. The imaging board 16 is a board that has an imaging element 18 and is a board that converts optical signals received by the imaging element 18 into electrical signals and outputs them as video signals. The imaging board 16 also has a driver IC that controls the driving of an autofocus driving device (not shown) and an anti-vibration driving device (not shown) that realize the above-mentioned autofocus function and anti-vibration function.

[0033] The coaxial cable (second wiring) 14 is a wiring group formed by bundling multiple wire-like wirings. One end of the coaxial cable 14 is connected to a connector 15a of a control board 15 provided in the fixed part 110, and the other end is inserted through the inside of the bearing 12, then fixed to the second movable part 130, and connected to a connector 16a of the imaging board 16. Video signals acquired by the imaging element 18 and drive signals for the drive systems of the autofocus mechanism and the vibration isolation mechanism are transmitted through the coaxial cable 14. The coaxial cable 14 is set to an appropriate length so that a large load is not generated due to excessive or insufficient length even when the second movable part 130 is rotated within a predetermined movable range. In this embodiment, an example in which the coaxial cable 14 is fixed to the second movable part 130 has been described. However, the coaxial cable 14 may be configured to be fixed to the first movable part 120 and then connected to the imaging board 16.

[0034] The winding FPC 13 is a flexible wiring board, one end of which is connected to a connector 15b on the control board 15 provided on the fixed portion 110, and the other end of which is fixed to the first rotating member 28. The winding FPC 13 serves to transmit drive signals for the second oscillatory wave motor 150 and position detection signals for the second sensor 25 to the control board 15. The lead-out portion 13b of the winding FPC 13 is fixed on the first rotating member 28 and is electrically connected to the motor FPC 4 of the second oscillatory wave motor 150 and the sensor FPC 25a of the second sensor 25 by connecting means (not shown). The winding FPC 13, the motor FPC 4, and the sensor FPC 25a may be integrated, or the motor FPC 4 and the sensor FPC 25a may be connected via a connector provided on the winding FPC 13.

[0035] The wound FPC 13 includes a wound portion 13a that is spirally wound around the rotation axis of the first rotating member 28 in the space X between the inner wall 28b of the first rotating member 28 and the outer wall 30e of the bearing holding member 30. One end of the wound portion 13a is fixed to the FPC fixing surface 28c of the first rotating member 28, and the other end is fixed to the FPC fixing surface 30f of the bearing holding member 30. The wound FPC 13 is configured so that the length of the wound portion 13a is neither too long nor too short when the wound portion 13a is tightened or unwound in the space X when the first rotating member 28 is rotated within a predetermined movable range. This prevents a large load from being applied to the wound FPC 13.

[0036] As described above, the wound portion 13a is provided in the space X between the inner wall 28b of the first rotating member 28 and the outer wall 30e of the bearing holding member 30. In other words, the wound portion 13a of the wound FPC 13 is provided radially outward of the bearing 12 relative to the bearing 12 and the bearing holding member 30.

[0037] The winding portion 13a is provided between the first oscillatory wave motor 140 and the bearing 12 on the ZX plane. The winding FPC 13 is provided on the outside of the bearing 12, and the coaxial cable 14 is passed inside the bearing 12, thereby preventing interference between the winding FPC 13 and the coaxial cable 14. In this configuration, the winding portion 13a of the winding FPC 13 is provided so as to at least partially overlap the first oscillatory wave motor 140 in the Y-axis direction, which is the rotational axis direction, and therefore the rotary drive device 100 can be made smaller in size in the Y-axis direction.

[0038] In this embodiment, an example has been described in which the inner ring 12b of the bearing 12 moves integrally with the first rotating member 28 of the first movable part 120, and the outer ring 12a is fixed to the bearing holding member 30, which is the fixed part 110. It is also possible to reverse this movable and fixed configuration and provide the inner ring 12b of the bearing 12 on the fixed side and the outer ring 12a on the movable side.

[0039] FIG. 7(a) schematically illustrates a configuration in which the inner ring 12b is the movable side and the outer ring 12a is the fixed side. FIG. 7(b) schematically illustrates a configuration in which the inner ring 12b is the fixed side and the outer ring 12a is the movable side. For convenience, the configuration in FIG. 7(a) is referred to as Configuration M, and the configuration in FIG. 7(b) is referred to as Configuration N. Note that each figure is partially omitted. In each figure, regions M-1 and N-1 indicate the movable portion formed by the first rotating member 28 and the like, regions M-2 and N-2 indicate the fixed portion formed by the bearing holding member 30 and the like, and regions M-3 and N-3 indicate the space where the wound portion 13a of the wound FPC 13 is provided. Regions M-3 and N-3 correspond to space X in FIG. 5.

[0040] As described above, as the first rotating member 28 rotates, the wound portion 13a of the wound FPC 13 unfolds or tightens in the space X between the inner wall 28b of the first rotating member 28 and the outer wall 30e of the bearing holding member 30. In other words, it is necessary to provide walls such as the inner wall 28b and the outer wall 30e on the inside and outside of the wound portion 13a. In configuration N, the wound portion 13a is provided in region N-3 between the wall (inner wall) 30g of the bearing holding member 30 and the wall (outer wall) 28d of the first rotating member 28.

[0041] Comparing configurations M and N, both have in common the first friction member 22 being provided on the outermost side. In configuration M, a bearing retaining member 30 is provided on the outer side of the bearing 12, and an outer wall 30e is provided. In configuration M, a first rotating member 28 that holds the first friction member 22 is provided on the outer side of this, and an inner wall 28b is provided on the inner side of this. On the other hand, in configuration N, the first rotating member 28 is provided on the outer side of the bearing 12, and an outer wall 28d is provided. In configuration N, a surface that receives the winding portion 13a must be provided on the bearing retaining member 30, which is the fixed member, outside the outer wall 28d. For this reason, configuration M only requires a region M-1 formed by the first rotating member 28 outside the region M-3, whereas configuration N requires regions N-2 and N-1 outside the region N-3. For this reason, configuration M can be made more compact in the radial direction than configuration N.

[0042] The configuration of the conventional example will be described below with reference to Fig. 8. Explanation of the same points as in the first embodiment will be omitted, and only the differences will be described.

[0043] A connecting member 836 is fixed to the first rotating member 828, and a first friction member 822 is fixed to the connecting member 836. As in the first embodiment, the first rotating member 828 is driven to rotate by the frictional force between the vibrator 801 of the first vibration wave motor 8140 and the first friction member 822. A plurality of rolling balls 834 are provided in contact with the connecting member 836, and a rolling bearing member 835 is provided facing the connecting member 836. The rolling bearing member 835 is fixed to a fixed member 832 via a fixed metal plate 833. The pressure force of the pressure spring 807 of the first vibration wave motor 8140 is received by the rolling balls 834, so that the first rotating member 828 can rotate smoothly without increasing the sliding load. The engagement portion 835a of the rolling receiver 835 is fitted into the cylindrical portion 828a of the first rotating member 828, thereby preventing the first rotating member 828 from moving within the XZ plane relative to the fixed member 832. That is, the engagement portion 835a on the rolling receiver 835 of the fixed portion 8110 is slidably fitted into the cylindrical portion 828a on the first rotating member 828 of the first movable portion 8120. The wound FPC 813 and the coaxial cable 814 are configured to be inserted through an opening 828b of the first rotating member 828.

[0044] The following describes the effects obtained by the first embodiment. In the configuration of the conventional example, the cylindrical portion 828a on the first movable portion 8120 is slidably fitted into the engaging portion 835a on the fixed portion 8110, thereby supporting the first movable portion 8120 in rotation with respect to the fixed portion 8110. For this reason, in the configuration of the conventional example, there is a fit gap between the engaging portion 835a and the cylindrical portion 828a, which causes, for example, a dead zone where operation is not possible, resulting in reduced responsiveness. If a support structure such as a bearing is provided to improve this, the space for the opening 828b of the first rotating member 828 through which the wound FPC 813 and the coaxial cable 814 are inserted will be lost. This poses a problem of no space for inserting the wound FPC 813 and the coaxial cable 814.

[0045] In contrast to this, in the first embodiment, the first movable part 120 is rotatably supported by the bearing 12 relative to the fixed part 110, and a preload is applied by fastening the bearing fixing member 31, thereby preventing rattle from occurring in the bearing 12. Furthermore, the wound part 13a of the wound FPC 13 is provided on the outside of the bearing 12, and the coaxial cable 14 is configured to be inserted inside the bearing 12.

[0046] This prevents dead zones caused by fitting backlash when driving first movable part 120, which is the driven body, and improves responsiveness. Furthermore, by inserting coaxial cable 14 inside bearing 12 and providing wound FPC 13 outside bearing 12, rotation drive device 100 can be configured without increasing its size in the Y-axis direction.

[0047] As described above, in the first embodiment, the wound portion 13a of the wound FPC 13 is provided on the outside of the bearing 12, and the coaxial cable 14 is inserted inside the bearing 12. As a result, it is possible to ensure space for inserting the wiring while improving the responsiveness when driving the driven body. (Second embodiment) A rotary drive device 200 according to a second embodiment of the present invention will be described below. In the first embodiment, an example has been described in which the drive unit that drives the first movable part 120 is a vibration wave motor.

[0048] In the second embodiment, a case will be described in which the drive unit that drives the first movable part 120 is an electromagnetic motor (first drive unit). Descriptions of the same parts as in the first embodiment will be omitted, and only differences from the first embodiment will be described.

[0049] Fig. 9 is a perspective view of an electromagnetic motor 204 of a rotary drive device 200 according to this embodiment. Fig. 10 is a cross-sectional view of the rotary drive device 200 according to this embodiment, and corresponds to Fig. 3(b) of the rotary drive device 100 according to the first embodiment.

[0050] The electromagnetic motor 204 is composed of a coil 237 and a magnet 238. The configurations of the bearing 212, the bearing holding member 230, and the first rotating member 228 are the same as those in the first embodiment. The bearing holding member 230 is provided with a plurality of winding portions 230f, and the coils 237 are wound around the winding portions 230f. The coils 237 are divided into three groups, and a three-phase AC voltage is applied to the coils 230f by a power supply unit (not shown). The first rotating member 228 is provided with a magnet 238, which is divided into multiple groups so that the magnetization direction varies in the circumferential direction. The electromagnetic force generated by the three-phase AC voltage applied to the coils 237 and the magnetic field of the magnet 238 generate an attractive force or a repulsive force that serves as a driving force for rotating the first rotating member 228. As a result, the first rotating member 228 can be rotated around the Y-axis relative to the bearing holding member 230.

[0051] The coaxial cable 214 is inserted through a hollow member 229 provided inside the bearing 212 and connected to a connector 216a of an imaging board 216 having an imaging element 218 and a connector 215a of a control board 215. One end (213b) of the wound FPC 213 is fixed to the first rotating member 228, and the other end is connected to a connector 215b of the control board 215. A wound portion 213a of the wound FPC 213 is wound spirally in a space X between an outer wall 228b of the first rotating member 228 and an inner wall 232a of the fixed member 232. In other words, the wound portion 213a is provided outside the electromagnetic motor 201 in the radial direction of the bearing 212. The wound portion 213a tightens or unwinds as the first rotating member 228 rotates, preventing a large load from being applied to the wound FPC 213.

[0052] In this embodiment, similarly to the first embodiment, the first movable part 220 is rotatably supported by the bearing 212 relative to the fixed part 210. In addition, two bearings 212 are provided, and a preload is applied by fastening the bearing fixing member 231, so that rattle does not occur in the bearings 212.

[0053] As a result, when first movable part 220, which is the driven body, is driven, a dead zone caused by fitting play does not occur, and responsiveness can be improved. Furthermore, by inserting coaxial cable 214 inside bearing 212 and providing wound FPC 213 outside bearing 212, rotation drive device 200 can be configured without being enlarged in the Y-axis direction. In particular, in this embodiment, the area inside first rotating member 228 is occupied by coil 237 and magnet 238. Therefore, by providing wound part 213a in the area outside first rotating member 228 and inside fixed member 232, rotation drive device 200 can be made smaller in the Y-axis direction.

[0054] As described above, in this embodiment, the wound portion 213a of the wound FPC 213 is provided on the outside of the bearing 212, and the coaxial cable 214 is configured to pass through the inside of the bearing 212. As a result, it is possible to ensure space for passing through the wiring while improving the responsiveness when driving the driven body.

[0055] Although the preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of the gist of the present invention. [Explanation of symbols]

[0056] 100 Drive unit 110 Fixed part 120 First moving part 130 Second moving part 12 Bearings 13 First wiring (wound FPC) 14 Second wiring (coaxial cable)

Claims

1. a fixed part, a first movable part held rotatably about a first axis relative to the fixed part, and a second movable part held rotatably about a second axis different from the first axis relative to the first movable part; a bearing that supports the first movable part rotatably around the first axis relative to the fixed part; a first wiring having one end connected to the fixed portion and the other end connected to the first movable portion; a second wiring having one end connected to the fixed portion and the other end connected to either the first movable portion or the second movable portion; the first wiring includes a winding portion wound around the first axis, The winding portion is provided on an outer side of the bearing in a radial direction of the bearing, The drive device, wherein the second wiring is inserted inside the bearing.

2. 2. The driving device according to claim 1, wherein the first wiring is a flexible wiring board.

3. 3. The drive device according to claim 1, wherein the second wiring is a wiring group in which a plurality of wire-like wirings are bundled together.

4. 4. The drive unit according to claim 1, wherein the winding portion is wound in a spiral shape.

5. the first movable portion has a cylindrical portion, The cylindrical portion is fitted into the bearing, 5. The drive device according to claim 1, wherein the second wiring is inserted into a region formed of a hollow portion of the cylindrical portion.

6. The actuator further includes a first drive unit that drives the first movable unit, the first driving unit is a vibration wave motor including a vibrator and a friction member, The drive unit according to claim 1 , wherein the winding portion is provided between the bearing and the first drive portion in a radial direction of the bearing.

7. The actuator further includes a first drive unit that drives the first movable unit, the first driving unit is an electromagnetic motor including a coil and a magnet, The drive unit according to claim 1 , wherein the winding portion is provided outside the first drive portion in a radial direction of the bearing.

8. The drive device according to claim 6 or 7, wherein the first drive section and the winding section are provided so as to at least partially overlap with each other in the direction of the first axis.

9. Further comprising a second drive unit that drives the second movable unit, 9. The drive device according to claim 1, wherein the first wiring transmits a drive signal for driving the second drive section.

10. The present invention further includes a position detection means for detecting a position of the second movable portion, 10. The drive device according to claim 1, wherein the first wiring transmits a position detection signal from the position detection means.

11. The driving device is an imaging device including an imaging element, the imaging element is provided on the second movable portion, 11. The driving device according to claim 1, wherein the second wiring transmits a video signal of the imaging element.

12. the bearing includes an inner ring having a first rolling surface, an outer ring having a second rolling surface, and balls provided between the first rolling surface and the second rolling surface, The inner ring is fixed to the first movable portion, The drive unit according to claim 1 , wherein the outer ring is fixed to the fixed portion.

Images