JP5805996B2 - Drive unit, lens barrel, and imaging device using ultrasonic motor - Google Patents

Description

  The present invention relates to a drive unit using an ultrasonic motor, a lens barrel, and an imaging apparatus.

  In recent years, there has been a demand for faster and quieter focusing operations in lens barrels and imaging devices. Along with this, an actuator using an ultrasonic motor as an actuator for moving a focusing lens is increasing.

  Ultrasonic motors used in lens barrels and imaging devices are roughly classified into ring types and pencil types, and are used properly according to the products and applications to which they are applied. The ultrasonic motor drive unit described here uses a pencil-type ultrasonic motor, and constitutes an ultrasonic motor drive unit together with a gear unit incorporating a plurality of reduction gears. This unit is mainly used to drive a focusing lens in a lens barrel of a single-lens reflex camera.

  Such a drive unit has existed in the past, and a drive unit using a DC motor as an actuator is still mounted. That is, it can be said that this drive unit is a highly versatile mechanism that can be applied to various uses by replacing the actuator.

  Here, the ultrasonic motor driving unit 100 in the conventional example will be described, and the basic structure of the ultrasonic motor driving unit will be described. FIG. 1 is a diagram showing an ultrasonic motor driving unit 100 in a conventional example. FIG. 2 is an exploded perspective view of the ultrasonic motor drive unit 100 in the conventional example. FIG. 3 is a cross-sectional view of the ultrasonic motor driving unit 100 in the conventional example.

  The ultrasonic motor driving unit 100 in the conventional example and the ultrasonic motor driving unit 200 in Example 1 of the present invention to be described later are provided in a camera (not shown) or a lens barrel (not shown) as an example. It is used as a drive unit for driving the focusing lens in the focusing operation of the illustrated lens barrel.

  Here, the configuration of the ultrasonic motor driving unit 100 in the conventional example shown in FIG. 1 will be described with reference to FIGS.

  In FIG. 2, the ultrasonic motor drive unit 100 in the conventional example includes a base member 101, a cover member 103, a connection pinion 105, a connection shaft 107, a connection gear 109, a clutch gear 111, a clutch spring 113, an idle gear 115, A motor screw 117, three cover screws 119, and an ultrasonic motor unit 121 are included.

  3, the ultrasonic motor unit 121 includes a motor base 123, a motor shaft 125, a stator 127, a rotor 129, an output gear 131, a bearing 133, a pressure spring 135, and a pressure screw 137. In this conventional example, the gear unit includes a base member 101, a cover member 103, a connection pinion 105, a connection shaft 107, a connection gear 109, a clutch gear 111, a clutch spring 113, an idle gear 115, and three cover screws 119. The

  2 and 3, the base member 101 fixes the ultrasonic motor unit 121 with two motor screws 117. The base member 101 supports an idle gear 115 that meshes with the output gear 131 of the ultrasonic motor unit 121. The idle gear 115 meshes with one of the gears superimposed in the axial direction with the output gear 131 and the other with the clutch gear 111. The base member 101 pivotally supports a clutch gear 111 that is offset by a clutch spring 113. The clutch gear 111 is configured to be movable in the axial direction by a switch lever (not shown), and transmits or disconnects the driving force between the idle gear 115 and the connecting gear 109.

  In FIG. 3, the cover member 103 pivotally supports an idle gear 115, a clutch gear 111, a connection pinion 105, and a connection gear 109. The connecting gear 109 meshes with the clutch gear 111 and is supported together with the connecting pinion 105 by a connecting shaft 107 provided through the cover member 103. The connection pinion 105 provided coaxially with the connection gear 109 outputs the transmitted driving force of the ultrasonic motor unit 121 and drives the scale ring and the focusing lens.

  Next, the configuration of the ultrasonic motor unit 121 will be described.

  In FIG. 3, in the ultrasonic motor unit 121, a base member 101 and a motor base 123 are fastened with a motor screw 117. A motor shaft 125 is inserted into the motor base 123. An end of the motor shaft 125 is formed with a return for preventing it from coming off, and the motor base 123 formed by insert molding or the like is inserted so as not to come off.

  The stator 127 is a substantially ring-shaped elastic body having a comb-like shape formed by cutting a plurality of grooves on the surface, and a piezoelectric element is attached to the back surface together with a flexible printed circuit board. The stator 127 is formed of a metal having a high resonance sharpness, and the tip end surface of the comb tooth portion and a sliding portion of the rotor 129 described later are in pressure contact to rotate the rotor 129.

  In addition, a hole corresponding to the shape of the motor base 123 is formed at the center of the stator 127, and the stator 127 does not rotate along with the rotation of the rotor 129 described later by being fitted to the motor base 123. So that its position is regulated.

  The rotor 129 is a substantially annular member formed of a light metal such as aluminum. In the rotor 129, a slider material such as surface treatment or engineering plastic is attached to a sliding surface with the stator 127 in order to improve wear resistance.

  The output gear 131 is engaged with the inner peripheral portion of the rotor 129 so as not to rotate, is rotatably supported by the motor shaft 125 via the bearing 133, and rotates integrally with the rotor 129. Therefore, the output gear 131 is an output member that is driven by the stator 127 via the rotor 129 and outputs the driving force of the ultrasonic motor.

  The pressure spring 135 and the pressure screw 137 urge the rotor 129 and the output gear 131 with respect to the stator 127 via the bearing 133 to perform pressure necessary for the structure of the ultrasonic motor unit.

Patent Document 1 shows an example in which an ultrasonic motor drive unit is formed by screwing an ultrasonic motor unit to a motor fixing portion provided in a gear unit, similar to the conventional ultrasonic motor drive unit described above. Has been.
JP-A-5-207761 (6th page, FIG. 9)

  However, in the above-described conventional ultrasonic motor drive unit, the ultrasonic motor unit is assembled in advance, and the motor base that holds the motor shaft is fixed to the base member of the gear unit with screws. There has been a problem that it is difficult to provide the motor shaft perpendicular to the member without inclining.

  Also, in the gear unit as shown in Patent Document 1, since the ultrasonic motor unit assembled as a separate member is attached to the gear unit, the ultrasonic motor is not inclined to the motor fixing portion. There was a problem that it was difficult to install the unit. Accordingly, the accuracy of the shaft between the gear that outputs the driving force from the ultrasonic motor and the gear that transmits the output by meshing with the gear is poor, and the output gear of the ultrasonic motor is easily tilted. was there. Therefore, there has been a problem that noise and the like are generated every time the ultrasonic motor is driven.

  This not only impairs the quality of the lens barrel and the image pickup apparatus, but is also a problem in the lens barrel corresponding to movie shooting that has been attracting attention in recent years.

  When moving image shooting is performed with a lens barrel made to shoot a still image, noise associated with aperture drive, zoom drive, focus drive, and the like is recorded as sound through the lens barrel and the imaging device. For this reason, it is necessary to incorporate a high level of quietness that is not required for taking a still image and special control not to record noise.

  Therefore, for the purpose of noise reduction, there are those that use a linear motor to drive the focusing lens, those that use a stepping motor to drive the aperture, and those that have a shock absorber disposed at the end of the zoom ring. is there.

  In recent imaging apparatuses, high-speed and high-precision autofocus is required, and an ultrasonic motor driving unit that performs focus driving is also required to have a structure that enables high-speed and high-precision driving. Also, in live view shooting with a single-lens reflex camera, it is common to use contrast detection autofocus instead of the usual phase difference detection autofocus. In contrast detection type autofocus, high accuracy is required for an actuator that drives a focusing lens. On the other hand, the conventional ultrasonic motor driving unit described above and the ultrasonic motor driving unit as shown in Patent Document 1 have a problem that they cannot withstand high-speed and high-accuracy driving due to low inter-axis accuracy. It was.

  Further, in recent years, with the downsizing of the imaging apparatus, the downsizing of the mechanism is required. However, in the above-described conventional ultrasonic motor drive unit, the ultrasonic motor unit assembled as a separate member is attached to the base member of the gear unit. Since the sonic motor drive unit has the same form, there is a problem that space cannot be saved because a screw head for screwing the gear unit and a space for screwing are required.

  The present invention solves the above problems by the following means. In order to facilitate understanding, description will be made with reference numerals corresponding to the drawings showing an embodiment of the present invention, but the present invention is not limited to this.

The invention shown in claim 1 is an ultrasonic motor including a stator, a rotor that is pressed against the stator, a base member that seats the stator in a non-rotatable manner, a concentric arrangement with the rotor, and the rotor. A first driving force transmission member that rotates integrally; a first support member that rotatably supports at least one of the rotor and the first driving force transmission member; and the first driving force transmission member. A second driving force transmitting member that transmits the driving force of the second driving member, a second supporting member that pivotally supports the second driving force transmitting member, a first supporting portion that supports the first supporting member, and the And a cover member having a second support part for supporting the second support member, wherein the base member supports the first support part for supporting the first support member and the second support member. second and a support portion possess, the first support member A driving unit using an ultrasonic motor, characterized in that it is held by inserting into the first support portion of the base member.

The invention shown in claim 2 is an ultrasonic motor including a stator and a rotor that is in pressure contact with the stator, a base member that seats the stator in a non-rotatable manner, a concentric arrangement with the rotor, A first driving force transmission member that rotates integrally; a first support member that rotatably supports at least one of the rotor and the first driving force transmission member; and the first driving force transmission member. A second driving force transmitting member that transmits the driving force of the second driving member, a second supporting member that pivotally supports the second driving force transmitting member, a first supporting portion that supports the first supporting member, and the And a cover member having a second support part for supporting the second support member, wherein the base member supports the first support part for supporting the first support member and the second support member. A second support portion that is in front of the base member The first support portion is a drive unit using the ultrasonic motor and having a concave or convex for positioning said first support member.

According to a third aspect of the present invention, there is provided an ultrasonic motor including a stator, a rotor that is in pressure contact with the stator, a base member that seats the stator in a non-rotatable manner, and is disposed concentrically with the rotor. A first driving force transmission member that rotates integrally; a first support member that rotatably supports at least one of the rotor and the first driving force transmission member; and the first driving force transmission member. A second driving force transmitting member that transmits the driving force of the second driving member, a second supporting member that pivotally supports the second driving force transmitting member, a first supporting portion that supports the first supporting member, and the And a cover member having a second support part for supporting the second support member, wherein the base member supports the first support part for supporting the first support member and the second support member. A first support member, A driving unit using an ultrasonic motor, characterized in that via said first support portion of said base member is integrally molded with said base member.

The invention shown in claim 4 is characterized in that the first support portion of the cover member has a concave shape or a convex shape for positioning the first support member. A drive unit using the ultrasonic motor according to any one of the above.

According to a fifth aspect of the present invention, the cover member and the first support member are integrally formed through the first support portion of the cover member. A drive unit using the ultrasonic motor according to any one of the above.

According to a sixth aspect of the present invention, the second support portion of the cover member has a concave shape or a convex shape for positioning the second support member. A drive unit using the ultrasonic motor according to any one of the above.

Invention claims 1 to 5, characterized in that said cover member through the second support portion of said cover member and said second support member are integrally molded as shown in claim 7 A drive unit using the ultrasonic motor according to any one of the above.

  The invention shown in claim 8 is characterized in that the second support portion of the base member has a concave shape or a convex shape for positioning the second support member. A drive unit using the ultrasonic motor according to any one of the above.

  The invention shown in claim 9 is characterized in that the base member and the second support member are integrally formed through the second support portion of the base member. A drive unit using the ultrasonic motor according to any one of the above.

  The invention shown in claim 10 uses the ultrasonic motor according to any one of claims 1 to 9, wherein the rotor and the first driving force transmission member are integrally formed. It was a drive unit.

  According to an eleventh aspect of the present invention, the rotor includes a bearing that supports the rotor on the first support member on an inner peripheral side thereof, and is mechanically coupled to the second driving force transmission member on an outer peripheral side thereof. The drive unit using the ultrasonic motor according to any one of claims 1 to 10, further comprising a first drive force transmission member that performs the above operation.

  According to a twelfth aspect of the present invention, the drive using the ultrasonic motor according to any one of the first to eleventh aspects, wherein the first support member and the stator are integrally formed. Is a unit.

  According to a thirteenth aspect of the present invention, the second support member and the second driving force transmission member are integrally formed. The super structure according to any one of the first to twelfth aspects, A drive unit using a sonic motor.

  The invention shown in claim 14 is a gear in which the first driving force transmission member and the second driving force transmission member mesh with each other. It is a drive unit using the described ultrasonic motor.

  A fifteenth aspect of the present invention is a lens barrel having a drive unit using the ultrasonic motor according to any one of the first to fourteenth aspects.

  A sixteenth aspect of the present invention is an imaging apparatus having a drive unit using the ultrasonic motor according to any one of the first to fourteenth aspects.

  Note that the configuration described with reference numerals may be modified as appropriate, and at least a part of the configuration may be replaced with another component.

  According to the present invention, it is possible to obtain an ultrasonic motor driving unit that is excellent in silence and that is thin while enabling high-speed and high-precision driving.

  Embodiments of the present invention will be described below with reference to FIGS. 4 to 10, the same members as those shown in FIGS. 2 and 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  Here, first, the ultrasonic motor drive unit 200 according to the first embodiment will be described. FIG. 4 is a cross-sectional view of the ultrasonic motor driving unit 200 according to the first embodiment.

  The ultrasonic motor drive unit 200 in the present embodiment is provided in a camera (not shown) or a lens barrel (not shown) as in the conventional ultrasonic motor drive unit 100, and a camera (not shown) or a lens mirror (not shown). It is used as a drive unit for driving a focusing lens in a tube focusing operation.

  Here, the ultrasonic motor drive unit 200 in the present embodiment will be described with reference to FIG. In FIG. 4, the ultrasonic motor drive unit 200 in this embodiment is not configured to attach a separate ultrasonic motor unit assembled in advance to the gear unit, but the gear unit and the ultrasonic motor unit are integrally configured. Base member 201, cover member 203, connection pinion 105, connection shaft 107, connection gear 109, clutch gear 111, clutch spring 113, clutch shaft 214, idle gear 115, idle shaft 216, three cover screws 119, motor shaft 125, a stator 127, a rotor 129, an output gear 131, a bearing 133, a pressure spring 135, and a pressure screw 137.

  In FIG. 4, the base member 201 also has the function of the motor base (reference numeral 123 in FIG. 3) shown in the conventional example, and has a shape corresponding to the hole of the stator 127, and a rotor 129 described later. The position of the stator 127 is regulated so that the stator 127 does not rotate in association with the rotation. A motor shaft 125 is inserted into the base member 201. Similar to the motor base 123, a return (not shown) is formed at one end of the motor shaft 125 to prevent it from coming off, and the base member 201 is inserted so as not to come off by being molded by insert molding or the like.

  In FIG. 4, the base member 201 and the cover member 203 position an idle shaft 216 that supports the idle gear 115 and a clutch shaft 214 that supports the clutch gear 111. This positioning is performed by inserting the idle shaft 216 and the clutch shaft 214 into the hole formed in the base member 201.

  In FIG. 4, the cover member 203 has a shape that covers the ultrasonic motor unit that is directly attached to the base member 201 without using a conventionally required motor base. Further, the other end of the motor shaft 125 having one end inserted into the base member 201 is inserted into a hole formed in the cover member 203 and fastened by a pressure screw 137.

  The cover member 203 is fixed to the base member 201 by three cover screws 119, and the base member 201 and the cover member 203 support the motor shaft 125, the idle shaft 216, and the clutch shaft 214 at both ends. Therefore, it is configured to be held at a predetermined position vertically without tilting.

  Further, in FIG. 4, the cover member 203 pivotally supports the connection pinion 105 and the connection gear 109 in the same manner as the cover member (reference numeral 103 in FIG. 3) shown in the conventional example. The connecting gear 109 meshes with the clutch gear 111 and is supported together with the connecting pinion 105 by a connecting shaft 107 provided through the cover member 203. The connection pinion 105 provided coaxially with the connection gear 109 outputs the transmitted driving force of the ultrasonic motor to drive the scale ring and the focusing lens.

  As described above, according to the ultrasonic motor drive unit 200 according to the first embodiment, unlike the conventional configuration in which a separate ultrasonic motor unit assembled in advance is attached to the gear unit, the base end of the motor shaft 125 Since the portion is inserted and held in the hole of the base member 201, the motor shaft 125 can be easily provided vertically without being inclined with respect to the base member 201.

  For this reason, the accuracy between the shafts between the output gear 131 supported by the motor shaft 125 via the bearing 133 and the idle gear 115 meshing with the output gear 131 is increased, and the noise at the time of driving the ultrasonic motor is greatly increased. As a result, the quietness can be improved.

  In addition, since the front end portion of the motor shaft 125 is inserted and held in the hole formed in the cover member 203 and both end portions of the motor shaft 125 are held at predetermined positions, the degree of perpendicularity of the motor shaft 125 is further increased. In addition to being able to increase, shaft blurring of the motor shaft 125 when the ultrasonic motor is driven can also be prevented.

  Further, since the stator 127 constituting the ultrasonic motor is fixed to the protruding portion of the base member 201, a conventionally required motor mount (reference numeral 123 in FIG. 3) and motor screw (reference numeral 117 in FIG. 3) are provided. It becomes unnecessary, and the cost can be reduced and the size can be reduced by reducing the number of parts.

  Next, the ultrasonic motor drive unit 300 in this embodiment will be described with reference to FIG. In FIG. 5, the ultrasonic motor driving unit 300 in this embodiment is similar to the ultrasonic motor driving unit 200 in that the ultrasonic motor unit is built in the ultrasonic motor driving unit, and includes a base member 301, a cover member 303, and a connection pinion. 105, connecting shaft 107, connecting gear 109, clutch gear 111, clutch spring 113, clutch shaft 314, idle gear 115, idle shaft 316, three cover screws 119, motor shaft 325, stator 127, rotor 129, output gear 131, A bearing 133 and a pressure spring 135 are included. On the other hand, the ultrasonic motor drive unit 300 is different in that the pressure screw 137 is eliminated and the protrusions formed on the base member 301 and the cover 303 are positioned by being inserted into the motor shaft 325. The idle shaft 316 that supports the idle gear 115 and the clutch shaft 314 that supports the clutch gear 111 have protrusions formed on the base member 301 and the cover member 303 at both ends of the idle shaft 316 and the clutch shaft 314, respectively. It is positioned by being inserted into the formed recess.

  Next, the ultrasonic motor drive unit 400 in this embodiment will be described with reference to FIG. In FIG. 6, the ultrasonic motor driving unit 400 in this embodiment includes an ultrasonic motor unit built in the ultrasonic motor driving unit, like the ultrasonic motor driving unit 200, and includes a base member 201, a cover member 403, and a connection pinion 105. , A connecting shaft 107, a connecting gear 109, a clutch gear 111, a clutch spring 113, an idle gear 115, three cover screws 119, a motor shaft 125, a stator 127, a rotor gear 430, a bearing 133, and a pressure spring 135.

  Unlike the ultrasonic motor drive unit 200, the ultrasonic motor drive unit 400 uses a rotor gear 430 in which a rotor 129 and an output gear 131 are integrally formed. As the material of the rotor gear 430, aluminum which is usually used for the rotor 129 is subjected to surface treatment, or an engineering plastic which is attached to the surface of the conventional rotor 129 and used as a slider material is used.

  In the ultrasonic motor drive unit 400 shown in FIG. 6, the cover member 403 is provided with an idle shaft 416 by integral molding. The end of the idle shaft 416 is positioned by being inserted into a hole formed in the base member 201. A clutch shaft 414 that supports the clutch gear 111 is also provided integrally with the cover member 403. The end of the clutch shaft 416 is positioned by being inserted into a hole formed in the base member 201.

  Next, the ultrasonic motor drive unit 500 in this embodiment will be described with reference to FIG. In FIG. 7, the ultrasonic motor drive unit 500 in the present embodiment includes an ultrasonic motor unit built in the ultrasonic motor drive unit in the same manner as the ultrasonic motor drive unit 200, and includes a base member 501, a cover member 203, and a connection pinion 105. The connecting shaft 107, the connecting gear 109, the clutch gear 111, the clutch spring 113, the idle gear 115, the three cover screws 119, the stator 127, the rotor gear 430, the bearing 133, and the pressure spring 135 hole portion.

  Unlike the ultrasonic motor drive unit 200, the ultrasonic motor drive unit 500 uses a cover member 501 in which the base member 101 and the motor shaft 125 are integrally formed.

  In the ultrasonic motor drive unit 500 shown in FIG. 7, the base member 501 is provided with an idle shaft 516 by integral molding. The end of the idle shaft 516 is positioned by being inserted into a hole formed in the cover member 203. A clutch shaft 514 that supports the clutch gear 111 is similarly provided on the base member 501 by integral molding. The end of the clutch shaft 514 is positioned by being inserted into a hole formed in the cover member 203.

  Next, the ultrasonic motor driving unit 600 in this embodiment will be described with reference to FIG. In FIG. 8, the ultrasonic motor drive unit 600 in this embodiment includes an ultrasonic motor unit built in the ultrasonic motor drive unit in the same manner as the ultrasonic motor drive unit 200, and includes a base member 601, a cover member 603, and a connection pinion 105. , Connecting shaft 107, connecting gear 109, clutch gear 111, clutch spring 113, idle gear 616, three cover screws 119, stator 626, rotor 129, output gear 131, bearing 133, pressure spring 135, and pressure screw 137. It is configured.

  Unlike the ultrasonic motor drive unit 200, the ultrasonic motor drive unit 500 uses a stator 626 in which a stator 127 and a motor shaft 125 are integrally formed.

  In order to prevent rotation of the stator 626, the base member 601 is formed with a D-cut projection, and is shaped to fit into a hole formed in the bottom surface of the center portion of the stator 626.

  Further, in the ultrasonic motor drive unit 600 shown in FIG. 8, the idle gear 616 integrally forms an idle shaft. Both ends of the idle gear are positioned by inserting protrusions formed on the base member 601 and the cover member 603 into holes formed on the idle gear 616.

  Similarly, the clutch shaft 214 that pivotally supports the clutch gear 111 is also provided integrally with the base member 601, and a protrusion that protrudes from the cover member 603 is formed at the end of the clutch shaft 214. It is positioned by being inserted into the part.

  Next, the ultrasonic motor drive unit 700 in this embodiment will be described with reference to FIG. In FIG. 9, the ultrasonic motor drive unit 700 in the present embodiment is built in the ultrasonic motor drive unit in the same manner as the ultrasonic motor drive unit 200, and includes a base member 701, a cover member 703, and a connection pinion 105. , Connecting shaft 107, connecting gear 109, clutch gear 111, clutch spring 113, idle gear 115, three cover screws 119, stator 127, rotor gear 430, bearing 133, pressure spring 135, and pressure screw 738. .

Gear and Rotor Integral Unlike the ultrasonic motor drive unit 200, the ultrasonic motor drive unit 700 is provided with a motor shaft 125 on the cover member 703 by integral molding.

  Further, in the ultrasonic motor drive unit 700 shown in FIG. 9, the cover member 703 is provided with an idle shaft 216 by integral molding. The end of the idle shaft 216 is positioned by being supported by a protrusion formed on the base member 701. Similarly, the clutch shaft 214 that supports the clutch gear 111 is also integrally formed with the cover member 703, and the end of the clutch shaft 214 is positioned by being supported by a protrusion formed on the base member 701. .

  Next, the ultrasonic motor driving unit 800 in the embodiment will be described with reference to FIG. In FIG. 10, the ultrasonic motor drive unit 800 in the present embodiment is built in the ultrasonic motor drive unit in the same manner as the ultrasonic motor drive unit 200, and includes a base member 201, a cover member 203, and a connection pinion 105. , Connecting shaft 107, connecting gear 109, clutch gear 111, clutch spring 113, clutch shaft 214, idle gear 816, three cover screws 119, motor shaft 125, stator 127, rotor 129, output gear 131, bearing 133, pressure A spring 135 and a pressure screw 137 are included.

  Unlike the ultrasonic motor drive unit 200, the ultrasonic motor drive unit 800 uses an idle gear 816 in which an idle gear 115 and an idle shaft 216 are integrally formed. Protrusions are formed at both ends of the idle gear 816 and are positioned by being inserted into support holes formed in the base member 101 and the cover member 103.

  An object of the present invention is to provide an ultrasonic motor drive unit that is excellent in silence and that is thin while allowing high-speed and high-accuracy driving, a configuration in which an ultrasonic motor unit (121) is built in a gear unit, and a motor A configuration in which the base (123) is omitted and a part of the base member (101) has the function of the motor base (123), and both ends of the motor shaft (125) are connected to the base member (101) and the cover member (103). Realized by the configuration held in

  In addition, as a secondary effect of the present invention, provision of a thin ultrasonic motor drive unit provides a margin in mechanism design, increases the degree of freedom in optical design in the lens barrel, and makes the unit common It is possible that the cost has been reduced.

  Further, as a secondary effect of the present invention, reduction in the number of parts and reduction in the number of assembling steps due to the configuration in which the ultrasonic motor unit and the gear unit are integrated.

  The reduction ratio of the ultrasonic motor drive unit according to the present invention is appropriately determined according to the weight of the driven body (focusing lens, cam, etc.) in the lens barrel or imaging apparatus to which the present invention is applied. In addition, various modifications and changes such as a change in the appearance of the gear unit and an increase / decrease in the number of gears can be made as required by changing the outer diameter of the gear, all of which are within the scope of the present invention.

In addition, engineering plastics such as polycarbonate can be basically used for parts constituting the present invention whose materials are not particularly limited. However, a fiber reinforced resin in which glass fiber, carbon fiber, or the like is mixed with the resin can be used as necessary, and a metal molded product by die casting or injection molding may be used.

It is a perspective view of the ultrasonic motor drive unit 100 in a prior art example. It is a disassembled perspective view of the ultrasonic motor drive unit 100 in a prior art example. It is sectional drawing of the ultrasonic motor drive unit 100 in a prior art example. It is sectional drawing of the ultrasonic motor drive unit 200 in Example 1 of this invention. It is sectional drawing of the ultrasonic motor drive unit 300 in Example 2 of this invention. It is sectional drawing of the ultrasonic motor drive unit 400 in Example 3 of this invention. It is sectional drawing of the ultrasonic motor drive unit 500 in Example 4 of this invention. It is sectional drawing of the ultrasonic motor drive unit 600 in Example 5 of this invention. It is sectional drawing of the ultrasonic motor drive unit 700 in Example 6 of this invention. It is sectional drawing of the ultrasonic motor drive unit 800 in Example 7 of this invention.

100 Ultrasonic Motor Drive Unit 101 Base Member 103 Cover Member 105 Connection Pinion 107 Connection Shaft 109 Connection Gear 111 Clutch Gear 113 Clutch Spring 115 Idle Gear 117 Motor Screw 119 Cover Screw 121 Ultrasonic Motor Unit 123 Motor Base 125 Motor Shaft 127 Stator 129 Rotor 131 Output gear 133 Bearing 135 Pressure spring 137 Pressure screw 200 Ultrasonic motor drive unit 201 Base member 203 Cover member 214 Clutch shaft 216 Idle shaft 300 Ultrasonic motor drive unit 301 Base member 303 Cover member 314 Clutch shaft 316 Idle shaft 325 Motor Shaft 400 Ultrasonic motor drive unit 403 Cover member 430 Rotogi 500 Ultrasonic motor drive unit 501 Base member 600 Ultrasonic motor drive unit 601 Base member 603 Cover member 616 Idle gear 626 Stator 700 Ultrasonic motor drive unit 701 Base member 703 Cover member 738 Pressure screw 800 Ultrasonic motor drive unit 816 Idle gear

Claims (16)

An ultrasonic motor comprising a stator and a rotor pressed against the stator ;
A base member for non-rotatably seating the stator;
A first driving force transmission member disposed concentrically with the rotor and rotating integrally with the rotor;
A first support member that rotatably supports at least one of the rotor and the first driving force transmission member;
A second driving force transmission member for transmitting the driving force of the first driving force transmission member;
A second support member that pivotally supports the second driving force transmission member;
A cover member having a first support part for supporting the first support member and a second support part for supporting the second support member;
The base member may have a second support portion supporting the first support portion and the second supporting member supporting the first support member,
The drive unit using an ultrasonic motor, wherein the first support member is inserted and held in the first support portion of the base member . An ultrasonic motor comprising a stator and a rotor pressed against the stator;
A base member for non-rotatably seating the stator;
A first driving force transmission member disposed concentrically with the rotor and rotating integrally with the rotor;
A first support member that rotatably supports at least one of the rotor and the first driving force transmission member;
A second driving force transmission member for transmitting the driving force of the first driving force transmission member;
A second support member that pivotally supports the second driving force transmission member;
A cover member having a first support part for supporting the first support member and a second support part for supporting the second support member;
The base member has a first support part that supports the first support member and a second support part that supports the second support member;
The drive unit using an ultrasonic motor , wherein the first support portion of the base member has a concave shape or a convex shape for positioning the first support member . An ultrasonic motor comprising a stator and a rotor pressed against the stator;
A base member for non-rotatably seating the stator;
A first driving force transmission member disposed concentrically with the rotor and rotating integrally with the rotor;
A first support member that rotatably supports at least one of the rotor and the first driving force transmission member;
A second driving force transmission member for transmitting the driving force of the first driving force transmission member;
A second support member that pivotally supports the second driving force transmission member;
A cover member having a first support part for supporting the first support member and a second support part for supporting the second support member;
The base member has a first support part that supports the first support member and a second support part that supports the second support member;
The drive unit using an ultrasonic motor, wherein the first support member is integrally formed with the base member via the first support portion of the base member . Said first support portion of said cover member, super according to any one of claims 1 to 3, characterized in that it has a concave or convex for positioning said first support member Drive unit using a sonic motor. The super member according to any one of claims 1 to 3, wherein the cover member and the first support member are integrally formed through the first support portion of the cover member. Drive unit using a sonic motor. Said second support portion of said cover member, super according to any one of claims 1 to 5, characterized in that it has a concave or convex shape for positioning the second supporting member Drive unit using a sonic motor. Ultra according to any one of claims 1 to 5, characterized in that said cover member through the second support portion of said cover member and said second support member are integrally molded Drive unit using a sonic motor. 8. The super body according to claim 1, wherein the second support portion of the base member has a concave shape or a convex shape for positioning the second support member. 9. Drive unit using a sonic motor. The super member according to any one of claims 1 to 7, wherein the base member and the second support member are integrally formed through the second support portion of the base member. Drive unit using a sonic motor. The drive unit using an ultrasonic motor according to any one of claims 1 to 9, wherein the rotor and the first driving force transmission member are integrally formed. The rotor includes a bearing that supports the rotor on the first support member on an inner circumferential side thereof, and a first driving force transmission member that is mechanically coupled to the second driving force transmission member on an outer circumferential side of the rotor. The drive unit using the ultrasonic motor according to any one of claims 1 to 10, wherein the drive unit is provided. The drive unit using an ultrasonic motor according to any one of claims 1 to 11, wherein the first support member and the stator are integrally formed. The drive unit using an ultrasonic motor according to any one of claims 1 to 12, wherein the second support member and the second driving force transmission member are integrally formed. The ultrasonic motor according to any one of claims 1 to 13, wherein the first driving force transmission member and the second driving force transmission member are gears that mesh with each other. Drive unit. A lens barrel having a drive unit using the ultrasonic motor according to any one of claims 1 to 14. An imaging apparatus having a drive unit using the ultrasonic motor according to any one of claims 1 to 14.

Images