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公开(公告)号：US20180164658A1
公开(公告)日：2018-06-14
申请号：US15843785
申请日：2017-12-15
申请人： NIKON CORPORATION
摘要： Noise produced during phase-difference changes is minimized without decreasing the responsiveness of a vibration-wave motor. A lens-side MCU for a lens barrel controls a drive apparatus that applies a drive voltage to the vibration-wave motor by outputting an A-phase drive signal and a B-phase drive signal thereto. The lens-side MCU uses, for example, a drive-voltage setting unit and a duty-cycle change unit to change the drive voltage. Also, the lens-side MCU is provided with a phase-difference change unit that changes the phase difference between the A-phase drive signal and the B-phase drive signal. When driving the vibration-wave motor, the lens-side MCU changes the drive voltage to Vreg, and when the phase-difference change unit is changing the aforementioned phase difference, the drive voltage is changed to V1, V1 being greater than zero and less than Vreg.
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公开(公告)号：US20230062176A1
公开(公告)日：2023-03-02
申请号：US17980762
申请日：2022-11-04
申请人： NIKON CORPORATION
发明人： Takatoshi ASHIZAWA
摘要： A lens barrel includes an element displaced by application of voltage; an elastic body having a contact surface coming into contact with the element, a drive surface to produce a vibration wave by displacement of the element, and a plurality of grooves; a moving element come into contact with the drive surface and rotated by the vibration wave; an annular ring rotated by rotating of the moving element; and a lens moved in an optical axis direction by rotating of the annular ring; wherein the element mainly contains a material having potassium sodium niobate, potassium niobate, sodium niobate, or barium titanate, wherein a value of [(T/B)÷W] is in a range of 0.84 to 1.94, where T represents a depth of the groove, B represents a distance from a bottom part of the groove to the contact surface, and W represents a radial width of the elastic body.
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公开(公告)号：US20210273586A1
公开(公告)日：2021-09-02
申请号：US17324587
申请日：2021-05-19
申请人： NIKON CORPORATION
发明人： Takatoshi ASHIZAWA , Azusa MUTO
摘要： A lens barrel includes: an electromechanical conversion element; an elastic body having a joining surface, a drive surface, and grooves; a motion member rotating by vibration wave of the drive surface; a rotating ring having a recess part and rotating by rotation of the motion member; a moving ring engaged to the recess part and moving to an optical axis direction by rotation of the rotating ring; and a lens held in the moving ring; wherein the element is made of a material having sodium potassium niobate, potassium niobate, sodium niobate or barium titanate, wherein a value of T/(B+C) is within a range of from 1.3 to 2.8 when: length from the drive surface to a base unit of the groove is defined as T; length from the base unit of the groove to the joining surface is defined as B; and thickness of the element is defined as C.
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公开(公告)号：US20200350838A1
公开(公告)日：2020-11-05
申请号：US16753959
申请日：2018-10-17
申请人： NIKON CORPORATION
发明人： Takatoshi ASHIZAWA
摘要： A vibration wave motor includes an element configured to be displaced by application of voltage, and an annular elastic body having a bottom surface coming into contact with the element and a drive surface having a groove, configured to drive a moving element by a vibration wave produced on the drive surface by displacement of the element. The element has a density of 4.2 to 6.0×103 kg/m3. A value of [(T/B)÷ W] is in a range of 0.84 to 1.94, where T represents a depth of the groove, B represents a distance from a bottom part of the groove to the bottom surface, and W represents a radial width of the elastic body.
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公开(公告)号：US20190326835A1
公开(公告)日：2019-10-24
申请号：US16314628
申请日：2017-06-30
申请人： NIKON CORPORATION
发明人： Takatoshi ASHIZAWA , Azusa MUTO
摘要： A vibration wave motor comprises: an electromechanical conversion element; an elastic body which has a drive surface on which a vibration wave is generated due to vibration of the electromechanical conversion element; and a relative motion member which makes contact with the drive surface of the elastic body and is configured to rotationally drive by the vibration wave, the electromechanical conversion element having a density of from 4.2 to 6.0×103 kg/m3, a plurality of grooves being provided on the drive surface side of the elastic body, and a value of T/(B+C) being within a range of from 1.3 to 2.8 when: depth of at least one groove of the plurality of grooves is defined as T; thickness from a base unit of the groove to a first surface is defined as B; and thickness of the electromechanical conversion element is defined as C.
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公开(公告)号：US20190129279A1
公开(公告)日：2019-05-02
申请号：US16234120
申请日：2018-12-27
申请人： NIKON CORPORATION
摘要： Noise produced during phase-difference changes is minimized without decreasing the responsiveness of a vibration-wave motor. A lens-side MCU for a lens barrel controls a drive apparatus that applies a drive voltage to the vibration-wave motor by outputting an A-phase drive signal and a B-phase drive signal thereto. The lens-side MCU uses, for example, a drive-voltage setting unit and a duty-cycle change unit to change the drive voltage. Also, the lens-side MCU is provided with a phase-difference change unit that changes the phase difference between the A-phase drive signal and the B-phase drive signal. When driving the vibration-wave motor, the lens-side MCU changes the drive voltage to Vreg, and when the phase-difference change unit is changing the aforementioned phase difference, the drive voltage is changed to V1, V1 being greater than zero and less than Vreg.
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公开(公告)号：US20160252797A1
公开(公告)日：2016-09-01
申请号：US15152001
申请日：2016-05-11
申请人： NIKON CORPORATION
摘要： Noise produced during phase-difference changes is minimized without decreasing the responsiveness of a vibration-wave motor. A lens-side MCU for a lens barrel controls a drive apparatus that applies a drive voltage to the vibration-wave motor by outputting an A-phase drive signal and a B-phase drive signal thereto. The lens-side MCU uses, for example, a drive-voltage setting unit and a duty-cycle change unit to change the drive voltage. Also, the lens-side MCU is provided with a phase-difference change unit that changes the phase difference between the A-phase drive signal and the B-phase drive signal. When driving the vibration-wave motor, the lens-side MCU changes the drive voltage to Vreg, and when the phase-difference change unit is changing the aforementioned phase difference, the drive voltage is changed to V1, V1 being greater than zero and less than Vreg.
摘要翻译： 在相位差变化期间产生的噪声最小化，而不降低振动波马达的响应性。 用于透镜镜头的镜头侧MCU通过向其发出A相驱动信号和B相驱动信号来控制向振动波马达施加驱动电压的驱动装置。 透镜侧MCU例如使用驱动电压设定单元和占空比变更单元来改变驱动电压。 此外，镜头侧MCU设置有改变A相驱动信号和B相驱动信号之间的相位差的相位差改变单元。 当驱动振动波马达时，透镜侧MCU将驱动电压改变为Vreg，并且当相位差改变单元改变上述相位差时，驱动电压变为V1，V1大于零和小于 比Vreg。
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公开(公告)号：US20240103249A1
公开(公告)日：2024-03-28
申请号：US18266509
申请日：2021-12-20
申请人： NIKON CORPORATION
发明人： Azusa MUTO , Takatoshi ASHIZAWA
IPC分类号： G02B7/04
CPC分类号： G02B7/04
摘要： A lens barrel includes first and second yokes each having a length in an optical axis direction, a third yoke that has a length in the optical axis direction and is disposed between the first and second yokes, first and second magnets disposed on the first and second yokes, respectively, a coil that is penetrated by the third yoke and is movable in the optical axis direction by magnetic forces of the first and second magnets, and a lens holding frame that holds a lens and is movable together with the coil in the optical axis direction, wherein a first plane including a first side surface, which is farther from the third yoke, of the first yoke intersects with a second plane including a second side surface, which is farther from the third yoke, of the second yoke.
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公开(公告)号：US20230369993A1
公开(公告)日：2023-11-16
申请号：US18225305
申请日：2023-07-24
申请人： NIKON CORPORATION
发明人： Takatoshi ASHIZAWA
摘要： A lens barrel includes an element displaced by application of voltage; an elastic body having a contact surface coming into contact with the element, a drive surface to produce a vibration wave by displacement of the element, and a plurality of grooves; a moving element come into contact with the drive surface and rotated by the vibration wave; an annular ring rotated by rotating of the moving element; and a lens moved in an optical axis direction by rotating of the annular ring; wherein the element mainly contains a material having potassium sodium niobate, potassium niobate, sodium niobate, or barium titanate, wherein a value of [(T/B)÷W] is in a range of 0.84 to 1.94, where T represents a depth of the groove, B represents a distance from a bottom part of the groove to the contact surface, and W represents a radial width of the elastic body.
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公开(公告)号：US20230221519A1
公开(公告)日：2023-07-13
申请号：US17927195
申请日：2021-03-22
申请人： NIKON CORPORATION
IPC分类号： G02B7/08 , H02N2/16 , H10N30/853 , C04B35/495
CPC分类号： G02B7/08 , H02N2/163 , H10N30/8542 , C04B35/495 , C04B2235/3255 , C04B2235/3236 , C04B2235/327
摘要： A vibrator includes an electromechanical transducer which is a piezoelectric ceramic made of sodium-potassium niobate metal oxides and whose temperature characteristics of a relative permittivity is 500 [ppm/° C.] or less in absolute value in a temperature range from −40° C. to 170° C., wherein excitation of the electromechanical transducer produces a vibration wave. Another vibrator includes an electromechanical transducer which is a piezoelectric ceramic made of sodium-potassium niobate metal oxides and whose temperature characteristics of a relative permittivity is 390 [ppm/° C.] or less in absolute value in a temperature range from 0° C. to 60° C., wherein excitation of the electromechanical transducer produces a vibration wave.
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