Vibration wave drive device, stator for a vibration wave motor, vibration wave motor, driving control system, optical apparatus, and manufacturing method of a vibration wave driving device
US-10038394-B2 · Jul 31, 2018 · US
Vibration wave motor, drive control system, and optical apparatus
US11469689B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11469689-B2 |
| Application number | US-201916429859-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jun 3, 2019 |
| Priority date | Jun 8, 2018 |
| Publication date | Oct 11, 2022 |
| Grant date | Oct 11, 2022 |
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- Title
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Abstract
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A vibration wave motor includes an annular oscillator, and an annular moving member provided so as to be in press contact with the oscillator. The oscillator includes an annular vibrating plate, and an annular piezoelectric element provided on a first surface of the vibrating plate. The vibrating plate is in contact with the moving member via a second surface of the vibrating plate, which is opposite the first surface. The piezoelectric element has a plurality of drive phase electrodes. When a driving region represents a region of the oscillator in which the drive phase electrodes are provided, and a non-driving region represents a remaining region of the oscillator, a contact area ratio S1 between the vibrating plate and the moving member in the non-driving region is less than a contact area ratio S2 between the vibrating plate and the moving member in the driving region.
First claim
Opening claim text (preview).
What is claimed is: 1. A vibration wave motor comprising: an oscillator having an annular shape; and a moving member having an annular shape, wherein the oscillator has a vibrating plate having an annular shape which is in contact with the moving member, and a piezoelectric element, wherein the piezoelectric element has a plurality of drive phase electrodes, and wherein when a driving region represents a region of the oscillator in which the drive phase electrodes are provided, and a non-driving region represents a remaining region of the oscillator, a contact area ratio S1 between the vibrating plate and the moving member in the non-driving region is less than a contact area ratio S2 between the vibrating plate and the moving member in the driving region. 2. The vibration wave motor according to claim 1 , wherein the value of S1/S2, which is the ratio of S1 to S2, is less than or equal to 0.97. 3. A drive control system comprising at least: the vibration wave motor according to claim 1 ; and a driving circuit electrically connected to the vibration wave motor. 4. The drive control system according to claim 3 , wherein the driving circuit has a signal generation unit that generates a 7th bending vibrating wave in the oscillator. 5. An optical apparatus comprising at least: the drive control system according to claim 3 ; and an optical member dynamically connected to the vibration wave motor. 6. An apparatus comprising: the vibration wave motor according to claim 1 ; and a driven member capable of being driven by the vibration wave motor. 7. A vibration wave motor comprising: an oscillator having an annular shape; and a moving member having an annular shape, wherein the oscillator has a vibrating plate having an annular shape which is in contact with the moving member, and a piezoelectric element, wherein the piezoelectric element has a plurality of drive phase electrodes, and wherein when a driving region represents a region of the oscillator in which the drive phase electrodes are provided, and a non-driving region represents a remaining region of the oscillator, a frictional force A of a portion of the vibrating plate in contact with the moving member in the non-driving region is less than a frictional force B of a portion of the vibrating plate in contact with the moving member in the driving region. 8. A vibration wave motor comprising: an oscillator having an annular shape; and a moving member having an annular shape, wherein the oscillator has a vibrating plate having an annular shape which is in contact with the moving member, and a piezoelectric element, wherein the piezoelectric element has a plurality of drive phase electrodes, and wherein when a driving region represents a region of the oscillator in which the drive phase electrodes are provided, and a non-driving region represents a remaining region of the oscillator, a frictional coefficient α of a portion of the vibrating plate in contact with the moving member in the non-driving region is less than a frictional coefficient β of a portion of the vibrating plate in contact with the moving member in the driving region.
Assignees
Inventors
Classifications
Power-operated focusing · CPC title
- H02N2/16Primary
using travelling waves {, i.e. Rayleigh surface waves} · CPC title
with mechanism for focusing or varying magnification · CPC title
Multi-phase circuits · CPC title
using retaining rings or springs (G02B7/027 takes precedence) · CPC title
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- What does patent US11469689B2 cover?
- A vibration wave motor includes an annular oscillator, and an annular moving member provided so as to be in press contact with the oscillator. The oscillator includes an annular vibrating plate, and an annular piezoelectric element provided on a first surface of the vibrating plate. The vibrating plate is in contact with the moving member via a second surface of the vibrating plate, which is op…
- Who is the assignee on this patent?
- Canon Kk
- What technology area does this patent fall under?
- Primary CPC classification H02N2/16. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Oct 11 2022 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).