JP4995760B2 - LENS DEVICE AND IMAGING DEVICE - Google Patents

Description

  The present invention relates to a lens device that moves a lens in an optical axis direction using an ultrasonic motor, and an imaging device including the lens device.

  Conventionally, there has been a lens device that performs focusing (focus adjustment) by moving a focusing lens (focus lens) in the optical axis direction using an ultrasonic motor (USM: UltraSonic Motor) as a drive source. The ultrasonic motor includes a stator and a rotor, generates ultrasonic vibrations in the stator, and generates a driving force by rotationally driving the rotor using a frictional force acting between the stator and the rotor.

  As the ultrasonic motor, there is a ring type ultrasonic motor including a ring type stator and a rotor. In an ultrasonic motor, for example, a rotor is held via a bearing (see, for example, Patent Document 1 and Patent Document 2 below). When a ring type ultrasonic motor is used as a drive source in the lens apparatus, for example, the center of the focus cam cylinder that holds the focus lens, that is, the optical axis is aligned with the rotation center of the rotor, and the rotor is rotated around the focus cam cylinder. It was like that.

  In a lens device using a ring-type ultrasonic motor, for example, a rotating member that can rotate together with the focus cam cylinder around the optical axis is provided on the outer peripheral side of the focus cam cylinder, and the rotational force of the rotor is applied to this rotating member. Some of them rotate the focus cam cylinder by transmitting. Some ring-type ultrasonic motors use a wave washer to press the rotor toward the stator so that the rotor and the stator are in good contact (see, for example, Patent Document 2 below).

  In a lens device using a ring type ultrasonic motor, even if the same ring type ultrasonic motor is used, abnormal noise may occur depending on the operating temperature of the lens device, the model of the lens device, etc. There has been a technique for preventing the generation of abnormal noise using a cushioning material formed by, for example, Patent Document 3 below.

JP-A-6-327272 JP-A-7-184378 Japanese Patent Laid-Open No. 5-21784

  However, in the techniques of Patent Document 1 and Patent Document 2 described above, when the concentric accuracy of the rotor with respect to the optical axis is low, there is a problem that the transmission efficiency of the rotational energy from the rotor to the member to which the rotational force of the rotor is transmitted decreases. there were. In addition, when the rotor is diameter-fitted to the lens barrel, the load during rotation of the rotor increases due to the frictional force generated between the inner peripheral surface of the rotor and the outer peripheral surface of the lens barrel. There has been a problem that the operation efficiency becomes unstable and the rotational energy transmission efficiency of the rotor decreases.

  Further, in the technique of Patent Document 3 described above, it is difficult to give the wave washer itself a positioning and alignment function due to errors in dimensional accuracy of components and variations in assembly, and the assembly is simply performed. However, there is a problem that it is difficult to bring the rotor and the stator into good contact. And since the contact state of a rotor and a stator is unstable, there existed a problem that the transmission efficiency of the rotational energy of a rotor fell.

  Moreover, in the technique of patent document 4 mentioned above, there existed a problem that the versatility had to be provided with the cushioning material according to the model. In addition, by changing the design for each model, there has been a problem that the manufacturing cost of each lens apparatus in the case of manufacturing a large number of models increases, resulting in poor productivity.

  An object of the present invention is to provide a lens apparatus and an imaging apparatus capable of improving the transmission efficiency when transmitting the rotational driving force of a rotor to an annular member in order to eliminate the above-described problems caused by the prior art. To do. In addition, in order to solve the above-described problems caused by the prior art, the present invention can improve the transmission efficiency when the rotational driving force of the rotor is transmitted to the annular member by a method not limited to a specific model. It is another object of the present invention to provide an imaging device.

  In order to solve the above-described problems and achieve the object, a lens device according to the present invention is configured by rotating an annular member provided with an inner peripheral side lens that is movable in the optical axis direction about the optical axis. A lens device for moving a lens, comprising: a stator and a rotor stacked in the optical axis direction; and a ring-type ultrasonic motor that generates a rotational driving force by rotating the rotor about the optical axis; An annular ring that is provided on the outer peripheral side of the annular member and has an optical axis centered on the optical axis, and that rotates with the rotation of the rotor to rotate the annular member; A plurality of bearings that are provided at equal intervals on a concentric circle, and that support a shaft that is freely contactable to and away from the annular member, and the bearings in a direction perpendicular to the optical axis Surface is characterized by being brought into contact with the outer peripheral surface of the interlock ring.

  According to the present invention, the end face of the bearing portion in the direction orthogonal to the optical axis is brought into contact with the interlocking ring, so that it is possible to perform AF without newly installing a dedicated member for improving concentricity between the rotor and the annular member. / Diameter for an interlocking ring that rotates in synchronism with the rotor by using a plurality of members provided at equal intervals around the optical axis for purposes other than concentric improvement, such as a bearing portion for switching MF operation, etc. By guiding the direction, concentricity between the rotor and the annular member can be improved.

  In the lens device according to the present invention, in the above invention, the bearing portion is provided so that a radial axis passing through the optical axis and orthogonal to the optical axis is a rotation axis, and the light in the bearing portion is The end face on the shaft side is in contact with the outer peripheral surface of the interlocking ring so as to be rotatable.

  According to the present invention, since the contact portion of the bearing portion is provided so as to be rotatable with respect to the moving direction of the interlocking ring with respect to the interlocking ring, the contact portion becomes rotational friction instead of sliding friction, thereby reducing the load. Thus, it is possible to improve the transmission efficiency of the driving force.

  In the lens device according to the present invention, in the above invention, the lens device is provided on the outer peripheral side of the annular member and has an annular shape centered on the optical axis, and the stator is attached to the rotor side in the optical axis direction. An urging member that urges, a regulating member that is provided on the outer peripheral side of the annular member and has an annular shape centered on the optical axis, and that restricts movement of the urging member in a direction away from the stator; The regulating member has a tapered portion that is inclined so as to approach the ring-type ultrasonic motor side as the distance from the optical axis increases from the outer diameter of the biasing member.

  According to this invention, the position of the urging member can be moved in the direction of the optical axis by the tapered portion provided in the regulating member as the ring type ultrasonic motor is driven, so that the urging member can be aligned. The rotor can be stably rotated without being affected by the dimensional accuracy and assembly accuracy of the parts.

  In the lens device according to the present invention, in the above invention, one or a plurality of elastic members having the same shape provided in a state of elastic deformation in the contraction direction between the rotor and the interlocking ring in the optical axis direction. It is characterized by having. According to the present invention, when manufacturing a large number of models, the rotor and the interlocking ring can be stably and satisfactorily contacted via the elastic member by adjusting the number of elastic members, and the rotor can be stably rotated. Can do.

  An image pickup apparatus according to the present invention includes an image pickup element that generates an electrical signal obtained by photoelectrically converting incident light, the above-described lens apparatus, and an optical member that causes light incident through the lens apparatus to enter the image pickup element. , Provided. According to the present invention, it is possible to provide an imaging device including a lens device that is stably driven without generating abnormal noise.

  According to the lens device and the imaging device of the present invention, there is an effect that the rotor can be stably rotated without increasing the load applied to the rotor during rotation. Thereby, it is possible to improve the transmission efficiency when transmitting the rotational driving force of the rotor to the annular member.

  Further, according to the lens device and the imaging device according to the present invention, the rotor and the interlocking ring can be stably and satisfactorily supported through the elastic member without changing the design or adjustment method for each model even when manufacturing many models. And the rotor can be rotated stably. Thereby, it is possible to improve the transmission efficiency when the rotational driving force of the rotor is transmitted to the annular member by a method not limited to a specific model.

  Exemplary embodiments of a lens apparatus and an imaging apparatus according to the present invention are explained in detail below with reference to the accompanying drawings.

(Schematic configuration of the lens device)
First, a schematic configuration of a zoom lens device according to an embodiment of the present invention will be described. In this embodiment, as an example of a lens apparatus according to an embodiment of the present invention, a lens (focus lens) for focusing (focus adjustment, focus adjustment) at a wide angle (wide) position and a telephoto (tele) position is used as a light beam. A zoom lens device that performs focus adjustment by moving in the axial direction will be described.

  1 and 2 are sectional views showing a schematic configuration of a zoom lens device according to an embodiment of the present invention. FIG. 1 is a cross-sectional view passing through the optical axis of the zoom lens device in the wide position, and FIG. 2 is a cross-sectional view passing through the optical axis of the zoom lens device in the tele position. 1 and 2, the zoom lens device 100 includes a substantially cylindrical lens barrel 101 having an optical axis as an axis.

  The zoom lens device 100 is attached to the main body of an imaging device (not shown) via a mount 102 provided on one end side in the optical axis direction of the lens barrel 101. An imaging element is disposed in the main body of the imaging apparatus. The image sensor photoelectrically converts external light received through the zoom lens device 100 and outputs an electrical signal corresponding to the amount of incident light. Specifically, the imaging element is realized by, for example, a CCD.

  The lens barrel 101 includes a zoom ring 103 and a focus ring 104. The zoom ring 103 and the focus ring 104 have an annular shape with the optical axis as an axis, and are provided so as to be rotatable relative to the lens barrel 101 around the optical axis. The zoom ring 103 and the focus ring 104 can rotate independently with respect to the lens barrel 101.

  A plurality of cam cylinders are provided on the inner peripheral side of the zoom ring 103 and the focus ring 104. The plurality of cam cylinders have a substantially cylindrical shape with the optical axis as an axis. The plurality of cam cylinders include a longitudinal groove whose longitudinal direction is the optical axis direction, a cam groove whose longitudinal direction is the direction inclined with respect to the optical axis direction, and the like. Reference numerals are omitted for a plurality of cam cylinders.

  Cam cylinders connected to each other among the plurality of cam cylinders constitute a cam mechanism. With this cam mechanism, each cam cylinder is movable relative to the connected cam cylinder in the optical axis direction. As a result, the length of the optical path formed in the lens barrel 101 is variable between the wide-angle state shown in FIG. 1 and the telephoto state shown in FIG. The cam mechanism can be easily realized by using various known techniques, and the description of the cam mechanism is omitted.

  A plurality (five in this embodiment) of lens groups 105 to 109 are provided on the inner peripheral side of the corresponding cam cylinder among the plurality of cam cylinders. The plurality of lens groups 105 to 109 are connected to a frame inserted in a vertical groove or a cam groove (both not shown) provided in the corresponding cam cylinder, and are thereby suspended in the corresponding cam cylinder. It is assumed that

  The frame inserted into the vertical groove or the cam groove can slide in the vertical groove or the cam groove. When the frame inserted into the vertical groove or cam groove slides in the vertical groove or cam groove, the plurality of lens groups 105 to 109 can be moved relative to the corresponding cam cylinder in the optical axis direction. Yes.

  Here, a cam mechanism is constituted by a plurality of lens groups 105 to 109, a cam cylinder in which each of the lens groups 105 to 109 is provided on the inner peripheral portion, and a frame connecting the lens group and the cam cylinder. The cam mechanism that enables the lens to move in the optical axis direction can be easily realized by using various known techniques, and the description of the cam mechanism is omitted.

  All or some of the plurality of lens groups 105 to 109 may be directly connected to the cam barrel. In this case, the lens group directly connected to the cam cylinder moves in the optical axis direction together with the cam cylinder when the cam cylinder connected to the lens group moves in the optical axis direction.

  An annular member 111 is provided on the outer peripheral side of a cam cylinder (focus cam cylinder) 110 that holds a focus lens for focus adjustment among the plurality of cam cylinders. The annular member 111 has a substantially cylindrical shape with the optical axis as an axis, and is connected to the focus ring 104 via a flange 112 provided on one end side in the optical axis direction. Thereby, the annular member 111 rotates in the same direction as the focus ring 104 as the focus ring 104 rotates.

  A ring type ultrasonic motor 113 is provided on the outer peripheral side of the annular member 111. The ring type ultrasonic motor 113 generates a driving force (rotational force) for rotating the annular member 111 around the optical axis. An AF interlocking ring 114 and a bearing portion 115 are provided on the outer peripheral side of the annular member 111. The driving force (rotational force) generated by the ring type ultrasonic motor 113 is transmitted to the annular member 111 via the AF interlocking ring 114 and the bearing portion 115.

  FIG. 3 is a cross-sectional view showing a part of the zoom lens device. In FIG. 3, the cross section which passes along the optical axis of each part concerning rotation of the annular member 111 and the annular member 111 is shown. In FIG. 3, the ring-type ultrasonic motor 113 includes a ring-shaped stator 301 and a rotor 302. The stator 301 and the rotor 302 are stacked in the optical axis direction.

  The ring type ultrasonic motor 113 is positioned with respect to the annular member 111 by an adjustment washer 303 that is in contact with the stator 301 portion. The washer 303 adjusts the position of the ring ultrasonic motor 113 in the optical axis direction. One or more washers 303 are provided depending on the model, manufacturing error of each component, and the like.

  The stator 301 includes a piezoelectric element and a plurality of protrusions that are arranged on the circumference of the piezoelectric element and protrude to the rotor 302 side. The illustration of the piezoelectric element and the protrusion is omitted. The rotor 302 is disposed in a state where one end side in the optical axis direction is in contact with the stator 301 and the other end side is in contact with the AF interlocking ring 114.

  In the ring type ultrasonic motor 113, when an AC voltage is applied to the piezoelectric element, a plurality of bending traveling waves are excited in the piezoelectric element. When the bending traveling wave is excited, the piezoelectric element is deformed so as to wave in the circumferential direction, and the entire piezoelectric element is displaced so that the dimension in the thickness direction becomes large. The deformation (displacement) of the piezoelectric element is enlarged by the protrusion and transmitted to the rotor 302. For example, when a traveling wave in the rightward direction is excited in the stator 301, an elliptical vibration wave in the leftward direction is generated at the tip of each protrusion.

  The rotor 302 includes, for example, a metal flange-like spring (not shown). When the stator 301 is excited, the rotor 302 is deformed so as to sink into the wavefront of the stator 301 that is deformed so as to be centered on the optical axis. Rotate as In the rotor 302, a resin material may be used instead of the flange 112-shaped spring. The ring type ultrasonic motor 113 rotates the rotor 302 by transmitting the vibration of the stator 301 to generate a driving force (rotational force).

  The AF interlocking ring 114 has a ring shape centered on the optical axis. The AF interlocking ring 114 has a shape in which the outer diameter changes in two steps in the optical axis direction, and a step is formed in a portion where the outer diameter changes. The AF interlocking ring 114 is arranged with the larger outer diameter facing the rotor 302 side.

  A rubber ring 304 is provided between the rotor 302 and the AF interlocking ring 114. The rubber ring 304 is formed by molding rubber into a ring shape. The rubber ring 304 can adjust the hardness and adjust the elastic force by adjusting the type of rubber used as the material of the rubber ring 304 and the blending ratio of additives blended into the rubber.

  Moreover, the rubber ring 304 can adjust the elastic force for every environmental temperature by adjusting the heat resistance of the rubber | gum used as a material. The elastic force of the rubber ring 304 can be adjusted by changing the number of rubber rings 304 disposed between the rotor 302 and the AF interlocking ring 114. The number of rubber rings 304 disposed between the rotor 302 and the AF interlocking ring 114 is different for each model, for example.

  The rubber ring 304 is disposed in a state of being elastically deformed in the contraction direction by being compressed by the rotor 302 and the AF interlocking ring 114, and in a direction in which the rotor 302 and the AF interlocking ring 114 are separated from each other by its own restoring force. Energized. Thereby, the rotational force of the rotor 302 is transmitted to the AF interlocking ring 114 via the rubber ring 304, and the AF interlocking ring 114 rotates in the same direction as the rotation direction of the rotor 302 as the rotor 302 rotates.

  By adjusting the elastic force of the rubber ring 304, the energy transmission efficiency from the rotor 302 to the AF interlocking ring 114 can be adjusted. Then, by adjusting the energy transmission efficiency from the rotor 302 to the AF interlocking ring 114 by changing the number of the rubber rings 304, it is possible to prevent (or reduce) the generation of abnormal noise accompanying the rotation of the rotor 302.

  In this embodiment, the rubber ring 304 formed of rubber is provided between the rotor 302 and the AF interlocking ring 114, but the present invention is not limited to this. A member formed in a ring shape using a polymer material having a predetermined elasticity instead of rubber may be provided between the rotor 302 and the AF interlocking ring 114.

  The bearing portion 115 is provided between the ring-shaped member connected to the focus ring 104 and the AF interlocking ring 114. The bearing 115 is in contact with the AF interlocking ring 114 in the optical axis direction and rotates in the same direction as the AF interlocking ring 114 as the AF interlocking ring 114 rotates. Along with the AF interlocking ring 114, the bearing portion 115 is provided so as to be rotatable about the optical axis along the outer peripheral surface of the barrel 101. As the bearing, for example, a ball bearing (ball bearing) including a plurality of balls can be used.

  The bearing unit 115 supports a shaft 305 whose axial direction is the radial direction of a circle centered on the optical axis. The tip of the shaft 305 is in contact with the outer peripheral surface of the annular member 111. The rotational force of the AF interlocking ring 114 is transmitted from the tip of the shaft 305 to the annular member 111 via a ball bearing (ball bearing). By using a ball bearing (ball bearing), the rotational force can be smoothly transmitted from the AF interlocking ring 114 to the shaft 305. The annular member 111 rotates around the optical axis by receiving a rotational force from the rotating shaft 305.

  FIG. 4 is a partially enlarged view of FIG. In FIG. 4, the periphery of the ring type ultrasonic motor 113 is shown enlarged. In FIG. 4, the bearing portion 115 is provided in a state where the surface on the optical axis side is in contact with the outer peripheral surface of the AF interlocking ring 114 with the smaller outer diameter. The bearing portions 115 are provided at a plurality of locations (three locations in this embodiment) on a concentric circle centered on the optical axis. The bearing portions 115 are provided at equal intervals on a concentric circle centered on the optical axis.

  A wave washer 401 as an urging member is provided on the outer peripheral side of the annular member 111. The wave washer 401 is in contact with the ring ultrasonic motor 113 from the side opposite to the AF interlocking ring 114 in the optical axis direction. The wave washer 401 has an annular shape centering on the optical axis, and has a shape in which the contact surface with the ring ultrasonic motor 113 is waved. The inner diameter of the wave washer 401 is larger than the outer diameter of the annular member 111. The inner peripheral surface of the wave washer 401 is separated from the outer peripheral surface of the annular member 111, so that the wave washer 401 can be displaced with respect to the optical axis and the annular member 111.

  In addition, a pressing ring 402 as a regulating member is provided on the outer peripheral side of the annular member 111. The holding ring 402 is in contact with the wave washer 401 from the side opposite to the ring ultrasonic motor 113 in the optical axis direction. The holding ring 402 has a fixed position in the optical axis direction with respect to the annular member 111, and restricts the movement of the wave washer 401 in the direction away from the stator 301. The holding ring 402 has a tapered portion 403 that is inclined so as to approach the ring-type ultrasonic motor 113 side as the distance from the optical axis increases from the outer diameter of the wave washer 401.

  When the ring type ultrasonic motor 113 is driven, vibration generated from the ring type ultrasonic motor 113 is transmitted to the wave washer 401, and the wave washer 401 vibrates. The wave washer 401 slides with respect to the outer peripheral surface of the annular member 111 by vibrating, and the position with respect to the optical axis changes. At this time, the position of the wave washer 401 is changed by the tapered portion 403 provided in the holding ring 402 so that the center of the wave washer 401 coincides with the optical axis. Alignment takes place.

  As a result, the wave washer 401 can be aligned only by driving the ring-type ultrasonic motor 113 without performing special adjustment during assembly work. This also makes it possible to stably bring the rotor 302 and the stator 301 and the rotor 302 and the AF interlocking ring 114 into contact with each other even when the dimensional accuracy of the components varies or the assembling accuracy varies. it can.

  In the zoom lens device 100, zoom adjustment can be performed by rotating the zoom ring 103 and moving the first lens group to the fifth lens group in the optical axis direction as the zoom ring 103 rotates. Yes. In zoom adjustment, when the zoom ring 103 is rotated clockwise with the objective side viewed from the imaging apparatus side along the optical axis, each lens group moves from the wide-angle position (see FIG. 1) to the telephoto position (FIG. 2). To see).

  In the zoom lens apparatus 100, when the zoom ring 103 is rotated counterclockwise while viewing the objective side from the imaging apparatus side along the optical axis during zoom adjustment, each lens group in the zoom lens apparatus 100 is rotated. Moves from the telephoto position (see FIG. 2) to the wide-angle position (see FIG. 1).

  In the zoom lens device 100, the focus adjustment can be performed by rotating the focus ring 104 and moving the fifth lens group in the optical axis direction as the focus ring 104 rotates. When focus adjustment is performed, when the focus ring 104 is rotated clockwise while viewing the objective side from the imaging device side along the optical axis, the fifth lens group is moved from the mount 102 side along the optical axis to the first lens group. Move to the side.

  In the zoom lens apparatus 100, when the focus ring is rotated counterclockwise in the state where the objective side is viewed from the imaging apparatus side along the optical axis during the focus adjustment, the fifth lens group is set to the optical axis. Along the first lens group, the lens moves to the mount 102 side.

  The focus adjustment can be performed by moving the fifth lens group by the driving force of the ring ultrasonic motor 113, so-called autofocus adjustment. During autofocus adjustment, the fifth lens group moves in the optical axis direction by the rotational force of the ring-type ultrasonic motor 113 applied to the annular member 111. The focus adjustment for manually rotating the focus ring 104 and the auto focus adjustment can be switched depending on whether the tip of the shaft provided in the bearing unit 115 is separated from or brought into contact with the annular member 111.

  As described above, according to the zoom lens device 100 of the embodiment of the present invention, the annular member 111 provided with the lens movable in the optical axis direction is rotated around the optical axis. A zoom lens apparatus 100 for moving a lens, which has a stator 301 and a rotor 302 stacked in the optical axis direction, and generates a rotational driving force by rotating the rotor 302 around the optical axis. A sound wave motor 113, an AF interlocking ring 114 that is provided on the outer peripheral side of the annular member 111, has an annular shape centered on the optical axis, and rotates with the rotation of the rotor 302. A plurality of bearing portions 115 that are provided on a concentric circle centered on the shaft at equal intervals and support a shaft that can be freely contacted and separated from the annular member 111; In addition, since the end surface of the bearing portion 115 in the direction orthogonal to the optical axis is in contact with the outer peripheral surface of the AF interlocking ring 114, the end surface of the bearing portion 115 in the direction orthogonal to the optical axis is AF interlocked. By contacting the ring 114, concentric improvements such as AF / MF operation switching can be achieved without newly installing a dedicated member for improving the concentricity between the rotor 302 and the annular member 111 (lens barrel 101). For other purposes, it is necessary to use a plurality of bearings 115 provided at equal intervals around the optical axis to guide the AF interlocking ring 114 that rotates in synchronism with the rotor in the radial direction, so that the rotor 302 is annular. Concentricity with the member 111 (lens barrel 101) can be improved.

  Further, according to the zoom lens device 100 of the embodiment of the present invention, the rotor 302 and the annular member are rotated by rotating the AF interlocking ring 114 that is in pressure contact with the rotor 302 and the bearing 115. The rotation center can be made coincident with 111, and the rotor 302 can be stably rotated without increasing the load applied to the rotor 302 during rotation. Thereby, it is possible to improve the transmission efficiency when the rotational driving force of the rotor 302 is transmitted to the annular member 111.

  Further, according to the zoom lens device 100 of the embodiment of the present invention, the bearing unit 115 is provided so as to have a radial axis passing through the optical axis and orthogonal to the optical axis as a rotation axis. Since the end surface on the optical axis side is in contact with the outer peripheral surface of the AF interlocking ring 114 so as to be rotatable, the contact portion of the bearing 115 with respect to the AF interlocking ring 114 is the AF interlocking ring 114. Therefore, the contact portion becomes rotational friction instead of sliding friction, so that the load can be reduced and the transmission efficiency of the driving force can be improved.

  Further, according to the zoom lens device 100 of the embodiment of the present invention, the annular lens 111 is provided on the outer peripheral side to form a ring shape centered on the optical axis, and the stator 301 is located on the rotor 302 side in the optical axis direction. A wave washer 401 as an example of an urging member to be urged, and an annular shape that is provided on the outer peripheral side of the annular member 111 and has an optical axis as a center, and moves the wave washer 401 in a direction away from the stator 301. A holding ring 402 as an example of a regulating member to be regulated, and the holding ring 402 is inclined outside the outer diameter of the wave washer 401 so as to approach the ring-type ultrasonic motor 113 side as the distance from the optical axis increases. Since the ring-shaped ultrasonic motor 113 is driven, the presser ring 402 is provided because the taper-shaped portion 403 is provided. Since the wave washer 401 can be aligned in the optical axis direction by the tapered portion 403 and the wave washer 401 can be aligned, the rotor 302 can be rotated stably without being affected by the dimensional accuracy and assembly accuracy of the components. Can be made. Thereby, it is possible to improve the transmission efficiency when the rotational driving force of the rotor 302 is transmitted to the annular member 111.

  Further, according to the zoom lens device 100 of the embodiment of the present invention, as an example of the elastic member having the same shape provided in a state of being elastically deformed in the contraction direction between the rotor 302 and the interlocking ring in the optical axis direction. Since one or a plurality of rubber rings 304 are provided, the rotor 302 and the interlocking ring can be stabilized via the rubber ring 304 by adjusting the number of the rubber rings 304 when manufacturing a large number of models. The rotor 302 can be rotated stably. As a result, it is possible to improve the transmission efficiency when the rotational driving force of the rotor 302 is transmitted to the annular member 111 using the same type of rubber ring 304 across multiple models.

  In addition, according to the imaging device including the zoom lens device 100 according to the embodiment of the present invention, the imaging device that generates an electrical signal obtained by photoelectrically converting incident light, the zoom lens device 100, and the zoom lens device 100 described above. And an optical member (for example, a plurality of lens groups 105 to 109) that causes the light incident through the image sensor to be incident on the image pickup device. Therefore, the zoom lens device can be stably driven without generating abnormal noise. An imaging apparatus including 100 can be provided. Thereby, it is possible to provide an imaging device with stable performance and easy to use.

  As described above, according to the lens device and the imaging device of the present invention, there is an effect that the rotor can be rotated stably without increasing the load applied to the rotor during rotation. Thereby, it is possible to improve the transmission efficiency when transmitting the rotational driving force of the rotor to the annular member.

  Further, according to the lens device and the imaging device according to the present invention, the rotor and the interlocking ring can be stably and satisfactorily supported through the elastic member without changing the design or adjustment method for each model even when manufacturing many models. And the rotor can be rotated stably. Thereby, it is possible to improve the transmission efficiency when the rotational driving force of the rotor is transmitted to the annular member by a method not limited to a specific model.

  As described above, the lens apparatus and the imaging apparatus according to the present invention move the lens in the optical axis direction using the ultrasonic motor that transmits the vibration generated in the stator to the other member via the rotor. In particular, the present invention is suitable for a lens apparatus and an imaging apparatus that move a lens in the optical axis direction using a ring type ultrasonic motor including a stator and a rotor having a ring shape centered on the optical axis.

It is sectional drawing (the 1) which shows schematic structure of the zoom lens apparatus of embodiment concerning this invention. It is sectional drawing (the 2) which shows schematic structure of the zoom lens apparatus of embodiment concerning this invention. It is sectional drawing which shows a part of zoom lens apparatus. FIG. 4 is a partially enlarged view of FIG. 3.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Zoom lens apparatus 111 Ring member 113 Ring type ultrasonic motor 301 Stator 302 Rotor 304 Rubber ring 401 Wave washer 402 Holding ring 403 Tapered shape part

Claims (4)

A lens device for moving the lens by rotating an annular member provided on the inner peripheral side with a lens movable in the optical axis direction around the optical axis,
A ring-type ultrasonic motor having a stator and a rotor stacked in the optical axis direction, and generating a rotational driving force by rotating the rotor around the optical axis;
An annular ring provided on the outer peripheral side of the annular member and having an annular shape centering on the optical axis, and rotating the annular member by rotating with the rotation of the rotor;
A plurality of bearings that are provided at equal intervals on a concentric circle centered on the optical axis, and that support a shaft that is detachable with respect to the annular member;
An urging member that is provided on the outer peripheral side of the annular member and has an annular shape centered on the optical axis, and urges the stator toward the rotor in the optical axis direction;
A restricting member that is provided on the outer peripheral side of the annular member and has an annular shape centered on the optical axis, and restricts movement of the biasing member in a direction away from the stator;
With
The end surface of the bearing portion in the direction orthogonal to the optical axis is in contact with the outer peripheral surface of the interlocking ring,
The regulating member is located outside the outer diameter of the urging member so as to be closer to the ring-type ultrasonic motor as it is separated from the optical axis, and is centered on the optical axis in a plane orthogonal to the optical axis. And a tapered portion that is inclined with respect to the optical axis in the direction of the optical axis . The bearing portion is provided so as to have a radial axis passing through the optical axis and orthogonal to the optical axis as a rotation axis,
The lens device according to claim 1, wherein an end surface of the bearing portion on the optical axis side is rotatably contacted with an outer peripheral surface of the interlocking ring. 3. The elastic member according to claim 1, comprising one or a plurality of elastic members having the same shape provided in a state of being elastically deformed in a contraction direction between the rotor and the interlocking ring in the optical axis direction. Lens device. An image sensor that generates an electrical signal obtained by photoelectrically converting incident light; and
The lens device according to any one of claims 1 to 3 ,
An optical member that causes the light incident through the lens device to enter the imaging device;
An imaging apparatus comprising:

Images