Drive control apparatus that drives actuator, electronic apparatus that drives actuator, and control method for driving actuator

Patent metadata

Field	Value
Publication number	US-9606628-B2
Application number	US-201514976178-A
Country	US
Kind code	B2
Filing date	Dec 21, 2015
Priority date	Jun 26, 2013
Publication date	Mar 28, 2017
Grant date	Mar 28, 2017

Abstract

A drive control apparatus includes a storage configured to store waveform data representing a drive signal constituted of a sine wave satisfying a frequency f 1 =(m/n)×f 0 (m and n are mutually different positive odd numbers), the drive signal applying vibration (m/2)×Q times (Q is a natural number other than 0) to an actuator, the f 0 representing a resonant frequency of the actuator, and a drive controller configured to read the waveform data stored in the storage, and output the drive signal corresponding to the read waveform data to the actuator.

First claim

What is claimed is:

1. A drive control apparatus comprising:
a storage configured to store waveform data representing a drive signal constituted of a sine wave satisfying a frequency f 1 =(m/n)×f 0 , where m and n are mutually different positive odd numbers, the drive signal applying vibration (m/2)×Q times, where Q is a natural number other than 0, to an actuator, the f 0 representing a resonant frequency of the actuator; and
a drive controller configured to read the waveform data stored in the storage, and drive the actuator in response to the drive signal represented by the waveform data,
wherein the m, the n and the Q are the numbers that reduce a residual vibration of the actuator to a level less than or equal to 0.02 G within 0.02 seconds after the drive controller has stopped reading the waveform data and stopped driving the actuator.

2. The drive control apparatus as claimed in claim 1 , wherein the frequency f 1 satisfies f 1 =(m/n)×f 0 , where m and n are natural numbers other than 0, and m>n.

3. An electronic apparatus comprising:
a touch panel;
an actuator having a resonant frequency f 0 and configured to vibrate the touch panel; and
a drive control apparatus including
a storage configured to store waveform data representing a drive signal constituted of a sine wave satisfying a frequency f 1 =(m/n)×f 0 , where m and n are mutually different positive odd numbers, the drive signal applying a vibration (m/2)×Q times, where Q is a natural number other than 0, to an actuator, the f 0 representing the resonant frequency of the actuator, and
a drive controller configured to read the waveform data stored in the storage, and drive the actuator in response to the drive signal represented by the waveform data,
wherein the m, the n and the Q are the numbers that reduce a residual vibration of the actuator to a level less than or equal to 0.02 G within 0.02 seconds after the drive controller has stopped reading the waveform data and stopped driving the actuator.

4. The electronic apparatus as claimed in claim 3 , wherein the storage stores data representing the resonant frequency f 0 of the actuator, the electronic apparatus further comprising:
a storage controller configured to apply to the actuator drive signals including the drive signal, the drive signals having different frequencies in predetermined bands, and store data representing a maximum vibration acceleration of the touch panel for each of the drive signals in the storage; and
a rewrite controller configured to rewrite the data representing the resonant frequency f 0 of the actuator stored in the storage with data representing a frequency of the drive signal corresponding to a maximum acceleration among the stored accelerations.

5. A non-transitory computer-readable recording medium storing a program, wherein when processed by processors, causes a computer to perform processes, the processes comprising:
reading waveform data representing a drive signal constituted of a sine wave satisfying a frequency f 1 =(m/n)×f 0 , where m and n are mutually different positive odd numbers, the drive signal applying a vibration (m/2)×Q times, where Q is a natural number other than 0, to an actuator, the f 0 representing a resonant frequency of the actuator; and
driving the actuator in response to the drive signal represented by the waveform data,
wherein the m, the n and the Q are the numbers that reduce a residual vibration of the actuator to a level less than or equal to 0.02 G within 0.02 seconds after the drive controller has stopped reading the waveform data and stopped driving the actuator.

6. A drive control method performed by a computer, the drive control method comprising:
reading waveform data representing a drive signal constituted of a sine wave satisfying a frequency f 1 =(m/n)×f 0 , where m and n are mutually different positive odd numbers, the drive signal applying a vibration (m/2)×Q times, where Q is a natural number other than 0, to an actuator, the f 0 representing a resonant frequency of the actuator; and
driving the actuator in response to the drive signal represented by the waveform data,
wherein the m, the n and the Q are the numbers that reduce a residual vibration of the actuator to a level less than or equal to 0.02 G within 0.02 seconds after the drive controller has stopped reading the waveform data and stopped driving the actuator.

Assignees

• Fujitsu Ltd

Inventors

• Taninaka Kiyoshi
• Kamata Yuichi
• Endo Yasuhiro
• Yabuki Akihiko

Classifications

• G06F3/016 Primary

  Input arrangements with force or tactile feedback as computer generated output to the user · CPC title

• B06B1/045

  using vibrating magnet, armature or coil system · CPC title

• G06F3/0416

  Control or interface arrangements specially adapted for digitisers · CPC title

• G06F3/041

  Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means · CPC title

• B06B1/0603

  using a piezoelectric bender, e.g. bimorph · CPC title