Motor holding structure and imaging apparatus

Abstract

To suppress vibration of a motor without increasing the size.SOLUTION: A motor holding structure of the present invention includes an opening provided on one side of a motor and a holding member, and a buffer member attached to the opening and disposed between the motor and the holding member. The opening has at least two gap portions that do not abut on the buffer member when the buffer member is attached. The two gap portions are positioned to face each other so as to sandwich the buffer member when viewed from an opening direction of the opening portion.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a motor holding structure and an imaging device. [Background technology]

[0002] Various devices using motors have been proposed in the past. An imaging device capable of pan-tilt drive can rotate a camera unit equipped with an image sensor and a group of lenses in both the pan and tilt directions. Specifically, the imaging device includes a tilt motor that rotates the camera unit in the tilt direction relative to the arm unit, and a pan motor that rotates the arm unit in the pan direction relative to the base unit. A motor pinion is attached to the drive shaft of each motor, and driving force is transmitted by a drive belt engaged with the motor pinion. Because vibration occurs as the motor rotates, a holding structure that suppresses vibration is employed between the motor and the member that holds the motor.

[0003] Patent Document 1 discloses a bearing retention device that mounts a motor to a body via a rubber bush attached to the motor bearing. As in Patent Document 1, by providing the rubber bush with a shape that allows for deformation, it is possible to stabilize the spring constant of the rubber bush when the rubber bush is compressed and assembled. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 5-209615 Summary of the Invention [Problem to be solved by the invention]

[0005] To prevent motor vibrations from being transmitted to the body, it is necessary to increase the buffer distance in the direction of motor rotation. However, the bearing retention device in Patent Document 1 requires the thickness of the rubber bushing to be increased, which creates a problem of increasing the size of the device.

[0006] The present invention has been made in consideration of the above-mentioned problems, and has an object to suppress vibration of a motor without increasing the size. [Means for solving the problem]

[0007] The present invention is a motor holding structure that holds a motor using a holding member, and is characterized in that it comprises an opening provided on either side of the motor or the holding member, and a buffer member attached to the opening and positioned between the motor and the holding member, the opening having at least two gap portions that do not abut the buffer member when the buffer member is attached, and the two gap portions are positioned opposite each other so as to sandwich the buffer member when viewed from the opening direction of the opening. [Effects of the Invention]

[0008] According to the present invention, vibration of the motor can be suppressed without increasing the size. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a perspective view showing an example of the overall configuration of an imaging device according to a first embodiment. [Figure 2] 3A and 3B are diagrams illustrating an example of the internal structure of an arm unit and a base unit. [Figure 3] FIG. 2 is an exploded perspective view showing an example of the configuration of a tilt motor assembly. [Figure 4] FIG. 2 is a perspective view showing an example of the configuration of a bush. [Figure 5] FIG. 10 is a perspective view showing an example of the configuration of a retaining screw. [Figure 6] FIG. 10 is a cross-sectional view showing an example of a state in which a retaining screw is inserted into a bush. [Figure 7] FIG. 3 is a diagram showing an example of the configuration of a first plate member. [Figure 8] FIG. 10 is a diagram illustrating an example of a tilt drive mechanism according to a second embodiment. [Figure 9] FIG. 2 is an exploded perspective view showing an example of the configuration of a tilt motor assembly. [Figure 10] FIG. 2 is a diagram illustrating an example of the configuration of a plate member. DETAILED DESCRIPTION OF THE INVENTION

[0010] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. An imaging device to which the motor holding structure according to the present invention is applied will be described below. First Embodiment Fig. 1 is a perspective view showing an example of the overall configuration of an imaging device 1. Here, the state shown in Fig. 1 will be described assuming that the imaging device 1 viewed from the imaged side is the front side, and the side opposite the front side is the back side. The imaging device 1 is a pan-tilt camera that can be driven in a pan-tilt direction. The imaging device 1 includes a camera unit 10, an arm unit 20, and a base unit 30.

[0011] The base unit 30 supports the entire imaging device 1 on its bottom surface. The base unit 30 also supports the arm unit 20 so that it can rotate about a pan rotation axis PA. The arm unit 20 supports the camera unit 10 so that it can rotate about a tilt rotation axis TA. Therefore, the camera unit 10 can rotate in both the pan direction and the tilt direction. The range of rotation of the camera unit 10 is, for example, from 30 degrees downward to 90 degrees upward in the tilt direction, and, for example, 170 degrees left and right in the pan direction.

[0012] The camera unit 10 includes an image sensor 110 and a lens unit 120. The image sensor 110 is disposed on the optical axis OA of the lens unit 120 and perpendicular to the optical axis OA. The image sensor 110 receives light from the lens unit 120 and generates an image signal that is the basis of image data. The image signal generated by the image sensor 110 is transmitted to the circuit board of the base unit 30 by passing through the arm unit 20 via an electrical cable that transmits signals.

[0013] The arm unit 20 has an arm section 210 that stands upright to support the camera unit 10 from both the left and right sides, and an arm base section 211 that connects the arm section 210 at the bottom and connects to the base unit 30. The base unit 30 is a pedestal that supports the arm unit 20 so that the arm unit 20 can rotate.

[0014] Fig. 2 is a diagram showing an example of the internal structure of the arm unit 20 and the base unit 30, and is a side view of the imaging device 1 as seen from one side of the tilt rotation axis TA. Note that Fig. 2 shows the inside of the arm unit 20 by omitting the exterior members of the arm unit 20. On the other hand, the inside of the base unit 30 is shown by dashed lines.

[0015] The arm unit 20 includes an arm frame 212 as a structure inside the arm section 210. The arm frame 212 supports the camera unit 10 via a bearing and also serves to hold the tilt drive mechanism. The tilt drive mechanism includes a tilt motor assembly 200, a tilt drive belt 220, a belt pressing roller 221, a tilt drive step gear 222, and a tilt drive scissors gear 223.

[0016] The tilt motor assembly 200 includes a tilt motor 230 that generates a tilt driving force. The driving force of the tilt motor 230 is transmitted from a tilt driving belt 220 to a tilt driving step gear 222 and a tilt driving scissors gear 223 in this order, with the speed reduced. Tilt drive belt 220 extends upward relative to tilt motor assembly 200. Belt pressure roller 221 applies appropriate tension to tilt drive belt 220 by pressing tilt drive belt 220. Tilt drive scissors gear 223 is connected to camera unit 10 via a bearing. In this way, the tilt drive mechanism is structured so that rotation of tilt motor 230 can tilt camera unit 10.

[0017] The base unit 30 includes a base frame 301, which is a structure that also serves as an exterior, and includes a pan drive mechanism and a circuit board 310. The base unit 30 also includes terminals 311 on the rear surface thereof. Similar to the tilt drive mechanism, the pan drive mechanism has a pan motor assembly 300, a pan drive belt 320, a belt pressing roller 321, a pan drive step gear 322, and a pan drive scissors gear 323. The pan drive mechanism is structured so that the arm unit 20 can be panned by the rotation of a pan motor 330.

[0018] The circuit board 310 provided inside the base unit 30 is, for example, a power supply circuit board 310P, a signal processing circuit board 310S, etc. The terminals 311 provided on the rear surface of the base unit 30 are, for example, a power supply terminal 311P mounted on the power supply circuit board 310P, a signal terminal 311S mounted on the signal processing circuit board 310S, etc.

[0019] The power supply circuit board 310P supplies power from an external power supply connected to a power supply terminal 311P to the signal processing circuit board 310S, tilt motor 230, pan motor 330, etc. The signal processing circuit board 310S receives an imaging signal from the imaging element 110 of the camera unit 10, performs image processing, outputs image data from a signal terminal 311S, and communicates with an external network connected to the signal terminal 311S.

[0020] The arrangement of the terminals 311 is not limited to the rear side, but it is preferable to provide them on the base unit 30, which is a pedestal, so that cables connected to the terminals 311 will not move due to pan / tilt driving.

[0021] FIG. 3 is an exploded perspective view showing an example of the configuration of the tilt motor assembly 200. As shown in FIG. The imaging device 1 has a tilt motor assembly 200 and a pan motor assembly 300 as motor assemblies, both of which have the same configuration. The tilt motor assembly 200 will be described below. The tilt motor assembly 200 includes a tilt motor 230 , a first plate member 240 , a bushing 250 , a retaining screw 260 , and a second plate member 270 .

[0022] The drive shaft of tilt motor 230 rotates around motor rotation axis MA. The drive shaft of tilt motor 230 has motor pinion 231. Tilt drive belt 220 is meshed with motor pinion 231, and the drive of tilt motor 230 is transmitted to tilt drive belt 220. Tilt motor 230 also has flange portion 232 in which multiple fixing holes 233 are formed. A stepping motor, for example, is used as the tilt motor 230. A stepping motor is a motor in which the drive shaft rotates in repeated steps. Therefore, depending on the step period and the number of rotations of the drive shaft, large vibrations may occur, especially in the rotation direction.

[0023] The first plate member 240 functions as a member on the tilt motor 230 side by being fixed to the tilt motor 230. Specifically, the first plate member 240 is fixed to the tilt motor 230 by fastening fixing screws 280 into fixing holes 233 of the tilt motor 230. Therefore, vibrations of the tilt motor 230 are directly transmitted to the first plate member 240. Furthermore, a motor shaft opening 241 is formed in the center of the first plate member 240, through which the drive shaft of the tilt motor 230 is inserted. The motor shaft opening 241 is, for example, a circular opening, but the shape is not limited thereto. The first plate member 240 will be described in detail later with reference to FIG.

[0024] The bushings 250 are flexible and function as buffer members. At least a portion of the bushings 250 is disposed between the first plate member 240 and the second plate member 270. In this embodiment, a plurality of (four) bushings 250 are attached to the first plate member 240 so as to surround the motor shaft opening 241. Specifically, the four bushings 250 are positioned on the same circumference, for example, centered on the motor rotation axis MA of the tilt motor 230. Furthermore, the bushings 250 are formed with insertion holes 251 through which retaining screws 260 are inserted (see FIG. 4). The bushing 250 will be described in detail later with reference to FIG.

[0025] The retaining screws 260 function as fastening members for fastening the first plate member 240 to the second plate member 270. Specifically, the retaining screws 260 are inserted through the insertion holes 251 of the bushings 250 and screwed into the second plate member 270, thereby fastening the first plate member 240 to the second plate member 270. In this embodiment, there are a plurality of (four) retaining screws 260, corresponding to the number of bushings 250. The retaining screw 260 will be described in detail later with reference to FIG.

[0026] The second plate member 270 functions as a holding member that holds the tilt motor 230. The second plate member 270 is fixed to the arm frame 212 by fastening fixing screws 290 into fixing holes in the arm frame 212. The second plate member 270 also has screw holes 271 formed therein into which the holding screws 260 are screwed. In this embodiment, a plurality of (four) screw holes 271 are formed in accordance with the number of the holding screws 260.

[0027] It is preferable that tilt motor assembly 200 includes at least three bushings 250 and retaining screws 260 to suppress tilt of the drive shaft of tilt motor 230. By including at least three bushings 250, even if a force that tilts the drive shaft is applied, the force applied to bushings 250 is in a direction that compresses bushings 250 in the axial direction of the drive shaft. Therefore, compared to when there are two or fewer bushings 250, the drive shaft of tilt motor 230 is less likely to tilt. In particular, although a tilting force acts on the drive shaft of tilt motor 230 due to the tension of tilt drive belt 220, at least three bushings 250 can suppress tilt of the drive shaft, preventing a decrease in the transmission efficiency of the drive force.

[0028] In this way, in tilt motor assembly 200, first plate member 240 and second plate member 270 are connected via bushing 250. Specifically, first plate member 240 and second plate member 270 are not directly connected, but are connected via bushing 250 and retaining screw 260. Bush 250 can absorb vibrations of first plate member 240 that occur when tilt motor 230 is driven by deformation based on its flexibility. Therefore, transmission of vibrations from first plate member 240 to second plate member 270 can be suppressed.

[0029] Furthermore, bushing 250, retaining screw 260, and first plate member 240 of tilt motor assembly 200 are configured to be able to suppress vibration in the rotational direction of tilt motor 230. Below, bushing 250, retaining screw 260, and first plate member 240 will each be described in detail.

[0030] FIG. 4 is a perspective view showing an example of the configuration of the bush 250. As shown in FIG. The bushing 250 is a cylindrical member, more specifically, a cylindrical member, and is made of an elastomer material such as styrene-butadiene rubber, ethylene-propylene rubber, or silicone rubber.

[0031] The bushing 250 is arranged so that the central axis BA of the cylinder is parallel to the motor rotation axis MA. An insertion hole 251 of the bushing 250 is formed along the central axis BA. The insertion hole 251 is circular when viewed from the direction of the central axis BA. An inner circumferential surface 252 of the insertion hole 251 faces a shaft portion 263 (described later) of a retaining screw 260 inserted into the insertion hole 251.

[0032] The bushing 250 also has an engaging portion 254 on its outer circumferential surface 253 that engages with the first plate member 240. The engaging portion 254 is a slit recessed from the outer circumferential surface 253 toward the central axis BA. The engaging portion 254 is located approximately in the center of the thickness t of the bushing 250, and is formed continuously around the entire circumference of the outer circumferential surface 253. Furthermore, bushing 250 has end faces 255, 256 on both sides in the direction along central axis BA. One end face 255 abuts against second plate member 270 when first plate member 240 and second plate member 270 are connected via bushing 250. The other end face 256 abuts against head 261 of retaining screw 260 when retaining screw 260 is inserted into insertion hole 251.

[0033] FIG. 5 is a perspective view showing an example of the configuration of the holding screw 260. As shown in FIG. The retaining screw 260 is a stepped screw. The retaining screw 260 of this embodiment is made of metal, and for example, cold heading carbon steel or the like can be used. The retaining screw 260 has a head 261, an externally threaded portion 262, and a shaft portion 263. The head 261 is flange-shaped and has a fitting groove, such as a cross recess or hexagonal socket, formed therein for fitting a rotary tool. The externally threaded portion 262 is screwed into a screw hole 271 of the second plate member 270.

[0034] The shaft portion 263 is located between the head portion 261 and the male thread portion 262. The shaft portion 263 has a cylindrical shape with an outer diameter larger than that of the male thread portion 262 and smaller than that of the head portion 261. The shaft portion 263 of this embodiment has a contact surface 263A and a gap surface 263B. The contact surface 263A is the outer peripheral surface of the shaft portion 263 with the larger outer diameter, and the gap surface 263B is the outer peripheral surface of the shaft portion 263 with the smaller outer diameter. Furthermore, the contact surface 263A is located on the head 261 side of the shaft portion 263, and the gap surface 263B is located on the male thread portion 262 side of the shaft portion 263.

[0035] FIG. 6 is a cross-sectional view showing a state in which the retaining screw 260 is inserted into the insertion hole 251 of the bushing 250. As shown in FIG. Here, the state in which the retaining screw 260 is inserted into the insertion hole 251 of the bushing 250 will be described. By inserting the retaining screw 260 into the insertion hole 251, the shank 263 faces the inner circumferential surface 252 of the insertion hole 251. At this time, the contact surface 263A of the shank 263 comes into contact with the inner circumferential surface 252. Therefore, the radial movement of the cylindrical bushing 250 is restricted. Meanwhile, the head 261 of the retaining screw 260 abuts against the end surface 256 of the bushing 250. Therefore, the movement of the cylindrical bushing 250 to one side in the thrust direction is restricted. Note that the opposite end surface 255 of the bushing 250 abuts against the second plate member 270, thereby restricting the movement of the cylindrical bushing 250 to the other side in the thrust direction.

[0036] Here, gap surface 263B of shaft portion 263 has an outer diameter smaller than contact surface 263A, and therefore does not come into contact with inner circumferential surface 252 of insertion hole 251, and a gap is generated between gap surface 263B and inner circumferential surface 252. This gap provides a deformation allowance for bushing 250. In other words, when tilt motor 230 vibrates, bushing 250 deforms to enter the gap, thereby enhancing the effect of bushing 250 in absorbing vibrations of tilt motor 230. The size of the gap is preferably equal to or greater than the amplitude of the vibration.

[0037] In the retaining screw 260 of this embodiment, the gap surface 263B is a parallel surface along the axial direction, but it may be an inclined surface that gradually tapers from the contact surface 263A. Whether the gap surface 263B is an inclined surface or not, as in the case where the gap surface 263B is a parallel surface, the effect of absorbing vibrations can be enhanced by the gap generated between the gap surface 263B and the inner circumferential surface 252. Furthermore, although the retaining screw 260 of this embodiment has an integrally formed shank 263, it may alternatively be formed as a separate part. That is, the retaining screw 260 may be formed by inserting a cylindrical shank 263 into a screw having a head 261 and an externally threaded portion 262. Even when the shank 263 is a separate part, the effect of absorbing vibrations can be enhanced by the gap formed between the clearance surface 263B and the inner circumferential surface 252, just as in the case where the shank 263 is an integral part.

[0038] Fig. 7(a) is a diagram showing an example of the configuration of the first plate member 240. Fig. 7(a) is a diagram seen from the opening direction of the motor shaft opening 241 (the axial direction of the motor rotation shaft MA). The first plate member 240 is a flat plate-shaped member. The first plate member 240 of this embodiment is made of a metal material, and for example, sheet metal such as steel, stainless steel, or aluminum alloy can be used. The first plate member 240 is formed by punching using a hydraulic press or a laser.

[0039] The first plate member 240 is formed with insertion holes 242 through which fixing screws 280 to be fastened to the tilt motor 230 are inserted. The first plate member 240 is also formed with bushing openings 243 for attaching bushings 250. The bushing openings 243 are formed in a flat plate-like portion of the first plate member 240. In this embodiment, the multiple (four) bushing openings 243 are positioned to surround the motor shaft opening 241.

[0040] FIG. 7( b ) is an enlarged view of one of the bushing openings 243 . The bushing opening 243 is formed by contact portions 244 (244A, 244B) and gap portions 245 (245A, 245B).

[0041] The contact portions 244 (244A, 244B) are portions that come into contact with the engagement portions 254 of the bushing 250. The bushing 250 is attached to the bushing opening 243 by the contact portions 244 and the engagement portions 254 coming into contact with each other. The bushing opening 243 of this embodiment has at least two separate contact portions 244A and 244B. The contact portion 244A is located near the motor shaft opening 241, and the contact portion 244B is located far from the motor shaft opening 241. The contact portions 244A and 244B have arc shapes that form part of an imaginary circle Cv centered at point O. The arc shapes of the contact portions 244A and 244B correspond to the shape of the engagement portion 254 of the bushing 250. Specifically, the radius of curvature ro (see FIG. 7(b)) of the arc shapes of the contact portions 244A and 244B is approximately the same as the radius of curvature rb (see FIG. 6) of the engagement portion 254 of the bushing 250.

[0042] 6 also shows a state in which the contact portions 244A and 244B are in contact with the engagement portion 254 of the bushing 250, and corresponds to a cross-sectional view taken along line II in Fig. 7(b). As shown in Fig. 6, the contact portions 244A and 244B are fitted into the slits that serve as the engagement portion 254, whereby the bushing 250 is attached to the bushing opening 243 with the contact portions 244A and 244B sandwiching the bushing 250 therebetween. Although the bushing opening 243 of this embodiment has two contact portions 244A and 244B, it may have three or more contact portions.

[0043] The gap portions 245 (245A, 245B) are portions that do not come into contact with the bushing 250 when the bushing 250 is attached to the bushing opening 243, and create a gap between the bushing 250 and the gap portions 245 (245A, 245B). The bushing opening 243 of this embodiment has at least two separated gaps 245A and 245B. The gaps 245A and 245B are formed continuously from the contact portions 244A and 244B, respectively. The gaps 245A and 245B are positioned opposite each other with the center O of the imaginary circle Cv in between. Therefore, when the bushing 250 is attached to the bushing opening 243, the gaps 245A and 245B are positioned opposite each other with the bushing 250 in between.

[0044] Gap 245A has an arc shape formed by cutting out imaginary circle Cv so that it bulges outward. On the other hand, gap 245B has an opening shape that communicates with the outer periphery of first plate member 240. Since gap 245B communicates with the outer periphery of first plate member 240, bushing 250 can be attached to bushing opening 243 by sliding through gap 245B. It should be noted that gap 245B is not limited to being in communication with the outer periphery of first plate member 240, and may be in communication with another opening formed in first plate member 240 that is larger than the outer shape of bushing 250. In this case, bushing 250 can be attached to bushing opening 243 by sliding from gap 245B through the other opening. However, gap 245B is not limited to being in communication with the outer periphery of first plate member 240 or another opening, and may not be in communication with either.

[0045] Here, the gaps 245A and 245B do not come into contact with the engaging portion 254 of the bushing 250, so that a gap can be generated between the first plate member 240 and the bushing 250. In this embodiment, the gaps 245A and 245B are formed at positions aligned with the vibration direction of the tilt motor 230. When the bushing opening 243 is viewed from the opening direction as shown in FIG. 7(a), vibrations occur in the bushing opening 243 along the circumference of an imaginary circle Cm whose center is the motor rotation axis MA of the tilt motor 230. In order to suppress such vibrations, the gaps 245A and 245B are both arranged on the circumference of the imaginary circle Cm whose center is the motor rotation axis MA of the tilt motor 230 (on the same circumference). That is, the gaps 245A and 245B are both positioned so as to overlap with the imaginary circle Cm. In other words, the gaps 245A and 245B are positioned in an arc direction with respect to the motor rotation axis MA of the tilt motor 230. Conversely, the above-mentioned contact portion 244A and the contact portion 244B are positioned so as not to overlap with the imaginary circle Cm. The size of the gap is preferably equal to or greater than the amplitude of the vibration.

[0046] In this way, by forming gaps 245, 245B at positions aligned with the vibration direction of tilt motor 230, a gap can be generated between first plate member 240 and bushing 250 in the vibration direction. Such a gap provides a deformation allowance for bushing 250. In other words, when tilt motor 230 vibrates, bushing 250 deforms to enter the gap, thereby enhancing the effect of bushing 250 in absorbing vibrations of tilt motor 230. In particular, in this embodiment, tilt motor 230 is a stepping motor, which is prone to vibration in the rotational direction, so by forming gaps 245, 245B in a position that aligns with the vibration direction of tilt motor 230, vibration can be absorbed more effectively.

[0047] As described above, according to the motor holding structure of this embodiment, at least two gaps 245A, 245B are positioned opposite each other across bush 250 in bush opening 243 of first plate member 240. Therefore, the gaps created by gaps 245A, 245B can enhance the effect of bush 250 in absorbing vibrations of tilt motor 230, so motor vibration can be suppressed without increasing the size. In this way, suppressing motor vibration can reduce vibrations occurring in the entire imaging device 1.

[0048] Furthermore, according to the motor retention structure of this embodiment, retention screw 260 has contact surface 263A that contacts inner circumferential surface 252 of bushing 250, and gap surface 263B that does not contact inner circumferential surface 252 of bushing 250. Therefore, the gap created by gap surface 263B can enhance the effect of bushing 250 in absorbing vibrations of tilt motor 230, so that vibrations of the motor can be suppressed without increasing the size.

[0049] In this embodiment, the bushing 250 has a cylindrical shape, and the contact portions 244A, 244B of the bushing opening 243 have an arc shape corresponding to the cylindrical shape, but the present invention is not limited to this. The bushing 250 and the contact portions 244A, 244B may have any shape as long as the gap portions 245A, 245B form a gap between the bushing 250 and the contact portions 244A, 244B.

[0050] In addition, in this embodiment, the shaft portion 263 of the retaining screw 260 is cylindrical and has the gap surface 263B, but this is not limited to this. Any shape may be used as long as the gap surface 263B creates a gap between the retaining screw 260 and the bushing 250.

[0051] Furthermore, in the present embodiment, the case where the gap surface 263B formed on the shaft portion 263 of the retention screw 260 is the outer peripheral surface of the portion of the shaft portion 263 with a smaller outer diameter has been described, but this is not limited to this. The gap surface 263B may have a shape formed by cutting out a portion of the outer peripheral surface of the shaft portion 263 in a flat shape, which is a so-called D-cut shape. By forming the gap surface 263B by cutting out a portion of the outer peripheral surface of the shaft portion 263 in a flat shape in this way, it is possible to ensure a large area for the contact surface 263A. In this case, it is preferable to form a pair of gap surfaces 263B at opposing positions on the outer peripheral surface of the shaft portion 263, and to fasten the retention screw 260 so that the direction of the gap surfaces 263B is aligned with the direction of vibration of the tilt motor 230.

[0052] Furthermore, in this embodiment, the first plate member 240 is described as a flat plate-shaped member, but the present invention is not limited to this, and any member having a bushing opening 243 formed around an extension line of the motor rotation shaft MA may be used. Therefore, the first plate member 240 may be subjected to, for example, step bending or hat bending, and the multiple bushing openings 243 may be located on different surfaces.

[0053] Furthermore, in this embodiment, the tilt motor assembly 200 and the pan motor assembly 300 have been described as having the same configuration, but this is not limited to this. The configuration capable of suppressing the vibration of the motor described above may be applied to only one of the tilt motor assembly 200 and the pan motor assembly 300 depending on the characteristics of the motor, drive, etc.

[0054] In addition, in this embodiment, the tilt motor assembly 200 has been described as having both a configuration in which a gap portion 245 is provided in the first plate member 240 and a configuration in which a gap surface 263B is provided in the retaining screw 260, but it is sufficient if it has either one of the configurations.

[0055] <Second embodiment> In this second embodiment, the configuration of the tilt drive mechanism and the arrangement of the gaps in the bushing openings are different from those in the first embodiment. The following description will focus on the configurations that are different from those in the first embodiment, and descriptions of similar configurations will be omitted as appropriate. FIG. 8 is a diagram showing an example of a tilt drive mechanism in the arm unit 20. As shown in FIG. The tilt drive mechanism includes a tilt motor assembly 2200, a tilt drive belt 2220, a belt pressing roller 2221, a tilt drive step gear 2222, and a tilt drive scissors gear 2223.

[0056] The tilt drive belt 2220 of this embodiment extends obliquely upward relative to the tilt motor assembly 2200. Therefore, a belt tension BT is applied obliquely upward to the drive shaft of the tilt motor 230. In order to avoid interference with the tilt drive belt 2220, no bushes 250 and retaining screws 260 are arranged in the direction in which the tilt drive belt 2220 extends. Therefore, the tilt motor assembly 200 of this embodiment includes three bushes 250 and three retaining screws 260. However, by providing at least three bushes 250, it is possible to suppress tilting of the drive shaft of the tilt motor 230.

[0057] FIG. 9 is an exploded perspective view showing an example of the configuration of the tilt motor assembly 2200. The tilt motor assembly 2200 includes a tilt motor 230 , a plate member 2240 , a bushing 250 , and a retaining screw 260 .

[0058] The plate member 2240 functions as a holding member that holds the tilt motor 230. A motor shaft opening 2241, through which the drive shaft of the tilt motor 230 is inserted, is formed in the center of the plate member 2240. Three bushing openings 2243 are formed in the plate member 2240 to surround the motor shaft opening 2241. A bushing 250 is attached to each of the three bushing openings 2243. A holding screw 260 is inserted into the bushing 250, and the holding screw 260 is fastened to a fixing hole 233 of the tilt motor 230. The plate member 2240 is fixed to the arm frame 212 by fastening a fixing screw 290 to the fixing hole of the arm frame 212. The plate member 2240 has an insertion hole 2242 formed therein, through which the fixing screw 290 is inserted and fastened to the fixing hole of the arm frame 212 (see FIG. 10 ).

[0059] Therefore, in tilt motor assembly 2200, tilt motor 230 and plate member 2240 are connected via bushing 250. Specifically, tilt motor 230 and plate member 2240 are not directly connected, but are connected via bushing 250 and retaining screw 260. Therefore, transmission of vibration from tilt motor 230 to plate member 2240 can be suppressed.

[0060] Here, the bushing opening 2243 in this embodiment includes two types: one first bushing opening 2243A and two second bushing openings 2243B. Fig. 10 is a diagram showing an example of the configuration of the plate member 2240. Fig. 10 is a diagram seen from the opening direction of the motor shaft opening 2241 (the axial direction of the motor rotation shaft MA).

[0061] The first bushing opening 2243A is formed on an extension line in the opposite direction to the pulling direction of the belt tension BT (the direction in which force is applied to the motor) of the plate member 2240. The first bushing opening 2243A is composed of contact portions 2244A and 2244B and gap portions 2245A and 2245B. The abutting portions 2244A and 2244B abut against the engaging portion 254 of the bushing 250, thereby attaching the bushing 250 to the first bushing opening 2243A. The abutting portion 2244A is located on the near side of the motor shaft opening 2241, and the abutting portion 2244B is located on the far side of the motor shaft opening 2241. The gaps 2245A and 2245B are portions that do not come into contact with the bushing 250 when the bushing 250 is attached to the first bushing opening 2243A. The gaps 2245A and 2245B are located opposite each other. Furthermore, both the gaps 2245A and 2245B are located so as to overlap with an imaginary circle Cm whose center is the motor rotation axis MA.

[0062] On the other hand, the two second bushing openings 2243B are formed on an imaginary line L that is perpendicular to the pulling direction of the belt tension BT and passes through the motor rotation shaft MA. The second bushing opening 2243B is composed of a contact portion 2246 and a gap 2247. The gap 2247 is positioned so as to overlap with an imaginary circle Cm whose center is the motor rotation shaft MA. Here, in the second bushing opening 2243B, the direction of the gap 2247 relative to the center O of the second bushing opening 2243B substantially coincides with the pulling direction of the belt tension BT. In such a second bushing opening 2243B, only one gap 2247 is disposed. That is, in the second bushing opening 2243B, the gap 2247 is disposed only in the direction from the center O of the second bushing opening 2243B substantially coincides with the pulling direction of the belt tension BT.

[0063] The reason why only one gap 2247 is provided in the second bushing opening 2243B is that the bushing 250 attached to the second bushing opening 2243B is deformed in advance by the belt tension BT so as to enter the gap 2247. That is, in the second bushing opening 2243B, there is a margin for deformation of the bushing 250 even if a gap is not provided on the side opposite to the pulling direction of the belt tension BT. Providing only one gap 2247 in the second bushing opening 2243B ensures a larger range for the abutment portion 2246, thereby enhancing the effect of the bushing 250 in absorbing vibrations of the tilt motor 230. It is preferable that gap 2247 of second bushing opening 2243B be larger than gaps 2245A and 2245B of first bushing opening 2243A. By making gap 2247 of second bushing opening 2243B larger in this way, even if bushing 250 enters gap 2247 in advance, a sufficient margin for deformation of bushing 250 can be ensured.

[0064] Furthermore, in this embodiment, gaps 2245A and 2245B provided in first bushing opening 2243A and gap 2247 provided in second bushing opening 2243B do not communicate with the outer periphery of plate member 2240 or other openings larger than bushing 250. This ensures a larger area for engagement portion 254 of bushing 250 to contact contact portions 2244A and 2244B of first bushing opening 2243A and contact portion 2246 of second bushing opening 2243B, thereby enabling plate member 2240 to reliably hold bushing 250. Taking advantage of the flexibility of bushing 250, bushing 250 can be temporarily compressed and pushed into each bushing opening 2243A and 2243B, thereby incorporating bushing 250 into plate member 2240.

[0065] Furthermore, retaining screw 260 may have shaft 263 configured so that the gap created by gap surface 263B that is substantially opposite the pulling direction of belt tension BT is enlarged. Because bushing 250 is deformed in advance by belt tension BT so as to enter gap surface 263B of retaining screw 260, providing gap surface 263B so that the gap is enlarged can enhance the effect of bushing 250 in absorbing vibrations of tilt motor 230.

[0066] Thus, according to this embodiment, in the second bushing opening 2243B where the direction of the gap 2247 substantially coincides with the direction of the belt tension BT, the gap 2247 is arranged only in the direction substantially coincident with the belt tension BT. Therefore, in the second bushing opening 2243B, the range of the abutment portion 2246 can be more secure, and the bushing 250 can be more effectively used to absorb vibrations of the tilt motor 230.

[0067] While the present invention has been described in detail above based on preferred embodiments thereof, the present invention is not limited to these specific embodiments, and various forms within the scope of the gist of the present invention are also included in the present invention. Parts of the above-described embodiments may be combined as appropriate.

[0068] The disclosure of this embodiment also includes the following configuration. (Configuration 1) A motor holding structure that holds a motor by a holding member, an opening provided on one side of the motor or the holding member; a buffer member attached to the opening and disposed between the motor and the holding member, the opening has at least two gaps that do not come into contact with the buffer member when the buffer member is attached; The motor holding structure is characterized in that the two gaps are positioned opposite each other so as to sandwich the buffer member when viewed from the opening direction of the opening. (Configuration 2) the opening is located away from the drive shaft of the motor; The motor holding structure according to configuration 1, wherein the two gaps are located on a circumference centered on the drive shaft when viewed from the opening direction of the opening. (Configuration 3) the opening has an abutment portion that abuts against the buffer member when the buffer member is attached, 3. The motor holding structure according to claim 2, wherein the abutting portion is located away from the circumference when viewed from the opening direction of the opening. (Configuration 4) the opening has at least two of the abutment portions, The motor holding structure according to configuration 3, wherein the two contact portions are separated by the gap portion. (Configuration 5) the opening is provided in a plate-like portion on one side of the motor or the holding member, A motor holding structure according to any one of configurations 1 to 4, characterized in that at least one of the two gaps is connected to a hole formed in the plate-shaped portion that is larger than the buffer member, or is connected to the outer periphery of the plate-shaped portion. (Configuration 6) a plurality of the openings; and a plurality of the buffer members attached to the openings, The motor holding structure of any one of configurations 1 to 5, wherein the plurality of openings are located on a circumference centered on the drive shaft of the motor when viewed from the opening direction of the openings. (Configuration 7) the buffer member is a cylindrical member having an end surface, 7. The motor holding structure according to any one of configurations 1 to 6, wherein the end surface is in contact with the other side of either the motor or the holding member. (Configuration 8) the opening has an abutment portion that abuts against the buffer member when the buffer member is attached, the buffer member has a slit recessed from an outer circumferential surface toward a central axis of the buffer member and continuously formed along the outer circumferential surface, 8. The motor holding structure according to any one of configurations 1 to 7, wherein the slit engages with the contact portion. (Configuration 9) 9. The motor holding structure according to any one of configurations 1 to 8, wherein the material of the buffer member is an elastomer. (Configuration 10) 9. A motor holding structure according to any one of configurations 1 to 8, wherein the material of the buffer member is styrene-butadiene rubber, ethylene-propylene rubber, or silicone rubber. (Configuration 11) a fastening member that is inserted into an insertion hole of the buffer member and fastens one side of the motor or the holding member to the other side via the buffer member; The fastening member is a contact surface that contacts the inner circumferential surface of the buffer member; 11. The motor holding structure according to any one of configurations 1 to 10, further comprising a gap surface that is not in contact with the inner peripheral surface of the buffer member. (Configuration 12) When the opening is a first opening, the buffer member is a first buffer member, and the gap is a first gap, a second opening different from the first opening; a second buffer member attached to the second opening, the second opening has a second gap that does not come into contact with the second buffer member when the second buffer member is attached; A motor holding structure described in any one of configurations 1 to 11, characterized in that the second gap portion is located in a direction in which force is applied to the motor when viewed from the opening direction of the second opening. (Configuration 13) The motor holding structure described in configuration 12 is characterized in that the second opening has an abutment portion that abuts against the second buffer member on the opposite side to the direction in which force is applied to the motor when viewed from the opening direction of the second opening. (Configuration 14) 14. The motor holding structure according to any one of configurations 1 to 13, wherein the opening is provided in a plate member fixed to a flange portion of the motor or a plate member serving as the holding member. (Configuration 15) 15. The motor holding structure according to any one of configurations 1 to 14, wherein the motor is a stepping motor. (Configuration 16) An imaging device including the motor holding structure according to any one of configurations 1 to 15, The imaging device, wherein the motor is a motor for performing pan / tilt driving of the imaging device. [Explanation of symbols]

[0069] 230: Motor 240: First plate member 243: Bush opening (opening) 250: Bush (buffer member) 244 (244A, 244B): Contact portion 245 (245A, 245B): Gap portion 270: Second plate member (holding member)

Claims

1. A motor holding structure that holds a motor by a holding member, an opening provided on one side of the motor or the holding member; a buffer member attached to the opening and disposed between the motor and the holding member, the opening has at least two gaps that do not come into contact with the buffer member when the buffer member is attached; The motor holding structure is characterized in that the two gaps are positioned opposite each other so as to sandwich the buffer member when viewed from the opening direction of the opening.

2. the opening is located away from the drive shaft of the motor; 2. The motor holding structure according to claim 1, wherein the two gaps are located on a circumference of a circle centered on the drive shaft when viewed from the opening direction of the opening.

3. the opening has an abutment portion that abuts against the buffer member when the buffer member is attached, 3. The motor holding structure according to claim 2, wherein the contact portion is positioned away from the circumference when viewed from the opening direction of the opening.

4. the opening has at least two of the abutment portions; 4. The motor holding structure according to claim 3, wherein the two contact portions are positioned so as to be separated by the gap portion.

5. the opening is provided in a plate-like portion on one side of the motor or the holding member, A motor holding structure as described in claim 1 or 2, characterized in that at least one of the two gaps is connected to a hole formed in the plate-shaped portion that is larger than the buffer member, or is connected to the outer periphery of the plate-shaped portion.

6. a plurality of the openings; and a plurality of the buffer members attached to the openings, 3. The motor holding structure according to claim 1, wherein the plurality of openings are positioned on a circumference of a circle centered on a drive shaft of the motor when viewed from the opening direction of the openings.

7. the buffer member is a cylindrical member having an end surface, 3. The motor holding structure according to claim 1, wherein the end surface is in contact with the other of the motor and the holding member.

8. the opening has an abutment portion that abuts against the buffer member when the buffer member is attached, the buffer member has a slit recessed from an outer circumferential surface toward a central axis of the buffer member and continuously formed along the outer circumferential surface, 8. The motor holding structure according to claim 7, wherein the slit engages with the contact portion.

9. 8. The motor holding structure according to claim 7, wherein the buffer member is made of an elastomer.

10. 8. The motor holding structure according to claim 7, wherein the material of the buffer member is styrene-butadiene rubber, ethylene-propylene rubber, or silicone rubber.

11. a fastening member that is inserted into an insertion hole of the buffer member and fastens one side of the motor or the holding member to the other side via the buffer member; The fastening member is a contact surface that contacts the inner circumferential surface of the buffer member; 3. The motor holding structure according to claim 1, further comprising a gap surface that does not contact the inner peripheral surface of the buffer member.

12. When the opening is a first opening, the buffer member is a first buffer member, and the gap is a first gap, a second opening different from the first opening; a second buffer member attached to the second opening, the second opening has a second gap that does not come into contact with the second buffer member when the second buffer member is attached; 3. The motor holding structure according to claim 1, wherein the second gap is positioned in a direction in which a force is applied to the motor when viewed from the opening direction of the second opening.

13. The motor holding structure according to claim 12, characterized in that the second opening has an abutment portion that abuts against the second buffer member on the opposite side to the direction in which force is applied to the motor when viewed from the opening direction of the second opening.

14. 3. The motor holding structure according to claim 1, wherein the opening is provided in a plate member fixed to a flange portion of the motor or in a plate member serving as the holding member.

15. 3. The motor holding structure according to claim 1, wherein the motor is a stepping motor.

16. An imaging device comprising the motor holding structure according to claim 1 or 2, The imaging device, wherein the motor is a motor for performing pan / tilt driving of the imaging device.

Images