Provided is a method of controlling a vibration motor, in which there are provided: a unit that generates a drive signal for generating elliptic motion; a unit that switches the drive signal with a voltage from a power supply, and changes a pulse width of the drive signal; a unit that detects a current flowing in an electromechanical energy conversion element through the switching unit; a unit that detects a position and a velocity of an object to be driven; and a control unit that controls the respective units, and sets the velocity of the object to be driven. The control unit controls a frequency and the pulse width of the drive signal so as to exercise a maximum output characteristic with respect to a target velocity within a range in which the current detected by the current detection unit does not exceed a given limit value.

Claims

20 · 4 independent · depth 2

20 granted claims

›1.independentA method of controlling a vibration motor comprising an electromechanical energy conversion element joined to an elastic body, the method comprising:n…+3

›2.↳ 1The method of controlling a vibration motor according to claim 1,nwherein the control unit comprises a determination unit that determines in which dom…d2

›3.↳ 1The method of controlling a vibration motor according to claim 1, further comprising determining whether the detected velocity of the object when the …d2

›4.↳ 1The method of controlling a vibration motor according to claim 1, further comprising gradually increasing the pulse width of the drive signal from 0, …d2

›5.independentA method of controlling a vibration motor comprising an electromechanical energy conversion element joined to an elastic body, the method comprising:n…+3

›6.↳ 5The method of controlling a vibration motor according to claim 5,nwherein the control unit comprises a determination unit that determines in which dom…d2

›7.↳ 5The method of controlling a vibration motor according to claim 5, further comprising determining whether the detected velocity of the object when the …d2

›8.↳ 5The method of controlling a vibration motor according to claim 5, further comprising gradually increasing the pulse width of the drive signal from 0, …d2

›9.independentA driver for a vibration motor comprising an electromechanical energy conversion element and an elastic body joined with the electromechanical energy …+5

›10.↳ 9The driver for a vibration motor according to claim 9,nwherein the control unit is configured to output, as the first signal, a signal to narrow the p…d2

›11.↳ 9The driver for a vibration motor according to claim 9,nwherein the determination unit is configured to determine whether the detected velocity of the …d2

›12.↳ 9The driver for a vibration motor according to claim 9, wherein the control unit is configured so as to output a signal to gradually increase the pulse…d2

›13.↳ 9The driver for a vibration motor according to claim 9, wherein the control unit is configured to output the first signal or the second signal when a c…d2

›14.↳ 9The driver for a vibration motor according to claim 9, wherein the elastic body comprises a contact portion, andnwherein an elliptic motion is generat…d2

›15.independentA driver for a vibration motor comprising an electromechanical energy conversion element and an elastic body joined with the electromechanical energy …+5

›16.↳ 15The driver for a vibration motor according to claim 15,nwherein the control unit is configured to output, as the first signal, a signal to narrow the …d2

›17.↳ 15The driver for a vibration motor according to claim 15,nwherein the determination unit is configured to determine whether the detected velocity of the…d2

›18.↳ 15The driver for a vibration motor according to claim 15, wherein the control unit is configured so as to output a signal to gradually increase the puls…d2

›19.↳ 15The driver for a vibration motor according to claim 15, wherein the control unit is configured to output the first signal or the second signal when an…d2

›20.↳ 15The driver for a vibration motor according to claim 15, wherein the elastic body comprises a contact portion, andnwherein an elliptic motion is genera…d2

Classifications

3 codes

IPC · International Patent Classification

Section H — Electricity

H02K33/00
H02P25/02

USPC · US Patent Classification

318/119

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File wrapper

Pendency

3.8 y

1,376 days filing → grant

Office actions

non-final + final

Responses

no RCE

Examiner

Kawing Chan

art unit 2837 · TC 2800

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Citations: 31 back · 0 forward

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1 priority documents

›Priority documents — 1

Type	Document	Date
related publication	US 20110291595 A1	1 Dec 2011

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