Oscillating actuator drive unit, lens barrel, optical apparatus, method for adjusting a voltage, and computer-readable recording medium

A lens barrel comprising:

• a lens;
• a motor driving the lens;
• an oscillating actuator coupled to the motor;
• and
• an oscillating actuator drive unit electrically coupled to the oscillating actuator, the oscillating actuator drive unit comprising:
• an oscillator unit that generates an oscillating signal having a first frequency;
• an amplifier unit that amplifies the oscillating signal based on a first amplification factor and generates a first amplified oscillating signal as a driving signal for driving the oscillating actuator;
• a voltage detecting unit that detects a first voltage associated with the first amplified oscillating signal;
• a signal control unit that receives the first voltage from the voltage detecting unit and computes a second amplification factor with reference to at least the first voltage, the signal control unit supplying the second amplification factor to the amplifier unit to allow the amplifier unit to amplify the oscillating signal based on the second amplification factor, the amplified oscillating signal having a second voltage, the second voltage being closer to a target voltage than the first voltage;
• and
• a temperature detecting unit that detects an ambient temperature of the oscillating actuator,
• wherein the signal control unit adjusts the frequency of the oscillating signal that is generated by the oscillator unit so as to be decreased when the ambient temperature is greater than a predetermined temperature, and adjusts the frequency of the oscillating signal that is generated by the oscillator unit so as to be increased when the ambient temperature is smaller than the predetermined temperature.

An optical apparatus comprising:

• an optical system;
• and
• an oscillating actuator drive unit coupled to the optical system, the oscillating actuator drive unit comprising:
• an oscillator unit that generates an oscillating signal having a first frequency;
• an amplifier unit that amplifies the oscillating signal based on a first amplification factor and generates a first amplified oscillating signal as a driving signal for driving an oscillating actuator;
• a voltage detecting unit that detects a first voltage associated with the first amplified oscillating signal;
• a signal control unit that receives the first voltage from the voltage detecting unit and computes a second amplification factor with reference to at least the first voltage, the signal control unit supplying the second amplification factor to the amplifier unit to allow the amplifier unit to amplify the oscillating signal based on the second amplification factor, the amplified oscillating signal having a second voltage, the second voltage being closer to a target voltage than the first voltage;
• and
• a temperature detecting unit that detects an ambient temperature of the oscillating actuator,
• wherein the signal control unit adjusts the frequency of the oscillating signal that is generated by the oscillator unit so as to be decreased when the ambient temperature is greater than a predetermined temperature, and adjusts the frequency of the oscillating signal that is generated by the oscillator unit so as to be increased when the ambient temperature is smaller than the predetermined temperature.

A method for adjusting a voltage of an oscillating signal, the method comprising:

• generating an oscillating signal having a first frequency;
• amplifying the oscillating signal based on a first amplification factor to generate a first amplified oscillating signal as a driving signal for driving an oscillating actuator;
• detecting a first voltage associated with the first amplified oscillating signal;
• computing a second amplification factor with reference to at least the first voltage;
• amplifying the oscillating signal based on the second amplification factor, the amplified oscillating signal having a second voltage, the second voltage being closer to a target voltage than the first voltage;
• detecting an ambient temperature of the oscillating actuator;
• and
• adjusting the frequency of the oscillating signal,
• wherein the frequency of the oscillating signal is decreased when the ambient temperature is greater than a predetermined temperature, and the frequency of the oscillating signal is increased when the ambient temperature is smaller than the predetermined temperature.

A non-transitory computer-readable recording medium recording a program which causes an ultrasonic motor to drive, the program causing the execution of a method comprising:

• generating an oscillating signal having a first frequency;
• amplifying the oscillating signal based on a first amplification factor to generate a first amplified oscillating signal as a driving signal for driving an oscillating actuator;
• detecting a first voltage associated with the first amplified oscillating signal;
• computing a second amplification factor with reference to at least the first voltage;
• amplifying the oscillating signal based on the second amplification factor, the amplified oscillating signal having a second voltage, the second voltage being closer to a target voltage than the first voltage;
• detecting an ambient temperature of the oscillating actuator;
• and
• adjusting the frequency of the oscillating signal,
• wherein the frequency of the oscillating signal is decreased when the ambient temperature is greater than a predetermined temperature, and the frequency of the oscillating signal is increased when the ambient temperature is smaller than the predetermined temperature.