Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Hiroaki Kohriyama0
Osamu Uchino0
Yoshinobu Yamamoto0
Date of Patent
March 1, 2011
0Patent Application Number
121934100
Date Filed
August 18, 2008
0Patent Citations Received
Patent Primary Examiner
Patent abstract
A liquid lens driver 10 has DC-DC converter 12, oscillator 14, pulse width modulator 16, and control logic circuit 18. The output buffer circuit 30 divides converter output voltage Vs of a prescribed amplitude (voltage level), input as the power source voltage, into bipolar, that is, positive/negative, output voltages Out-A, Out-B for output, and, corresponding to the H/L level of PWM signal CPWM, it turns ON/OFF the two output voltages Out-A, Out-B. In this way, from liquid lens driver 10, pulse width modulation (PWM) output voltages Out-A, Out-B are applied as driving voltage VL on electrodes 104, 108 of liquid lens 100.
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