Frequency signal control circuit and vibration type motor apparatus using same
AssigneeCanon Kabushiki Kaisha
InventorHajime Fukui
Life of this patent
Estimating the term…
Abstract
A frequency signal control circuit for a vibration type motor apparatus, which uses as a driving force a vibration generated by application of a frequency signal to an electro-mechanical energy conversion element thereof, inhibits a shift operation of the frequency signal to a lower frequency when a detector detects that a voltage level of a power supply is less than or equal to a predetermined first level, and shifts the frequency to a higher frequency when the detector detects that the voltage level is less than or equal to a second level, the second level being lower than the first level.
Claims13
A vibration type apparatus using, as a driving force, a vibration generated upon application of a frequency signal to an electro-mechanical energy conversion element, or a system including said vibration type driving apparatus, comprising:
- a) a power supply circuit for supplying a power supply voltage to said driving apparatus;
- b) a detector for detecting a voltage level corresponding to the absolute value of a power supply voltage from said power supply circuit, said detector outputting a first signal when a detected voltage level of the absolute value of the power supply voltage is lower than a first voltage level and outputting a second signal when the power supply voltage is lower than a second voltage level, the first voltage level being higher than the second voltage level;
- and
- c) a control circuit, responsive to a signal from said detector, for controlling a control mode of the frequency signal, such that said control circuit changes the control mode of the frequency signal from a first mode to a second mode in response to the first signal, and changes the control mode of the frequency signal from the second mode to a third mode in response to the second signal.
A vibration type driving apparatus using, as a driving force, a vibration generated upon application of a frequency signal to an electro-mechanical energy conversion element, or a system including said vibration type driving apparatus, comprising:
- a) a power supply circuit for supplying a power supply voltage to said driving apparatus;
- b) an A/D converter for converting a voltage level corresponding to the absolute value of the power supply voltage from said power supply circuit into a digital value;
- and
- c) a control circuit for comparing a converted digital value output by said A/D converter with a predetermined value and performing frequency control of the frequency signal in accordance with the comparison result.
A vibration type driving apparatus using, as a driving force, a vibration generated upon application of a frequency signal to an electro-mechanical energy conversion element, or a system including said vibration type driving apparatus, comprising:
- a) a booster circuit for boosting a battery output to obtain a power supply voltage to the apparatus;
- b) a detector for detecting a value corresponding to the absolute value of the power supply voltage output by the battery output;
- and
- c) a control circuit for performing frequency control of the frequency signal on the basis of a detection result of said detector.
A vibration type driving apparatus using, as a driving force, a vibration generated upon application of a frequency signal to an electro-mechanical energy conversion element, or a system including said vibration type driving apparatus, comprising:
- a) a booster circuit for boosting a battery output of a battery to provide a power supply voltage to the apparatus;
- b) a detector for detecting a current value corresponding to the absolute value of a current from the battery;
- and
- c) a control circuit for performing frequency control of the frequency signal on the basis of a detection result of said detector.
Dependencies are inferred from the claim text.