Patents by Inventor Hiroaki Kohriyama

Hiroaki Kohriyama has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Method and apparatus for driving a liquid lens
    Patent number: 7897899
    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.
    Type: Grant
    Filed: August 18, 2008
    Date of Patent: March 1, 2011
    Assignee: Texas Instruments Incorporated
    Inventors: Osamu Uchino, Hiroaki Kohriyama, Yoshinobu Yamamoto
  • LIQUID LENS DRIVING METHOD, LIGUID LENS DRIVER, AND IMAGE PICKUP METHOD AND IMAGE PICKUP DEVICE USING LIQUID LENS
    Publication number: 20090302197
    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.
    Type: Application
    Filed: August 18, 2008
    Publication date: December 10, 2009
    Applicant: TEXAS INSTRUMENTS INCORPORATED
    Inventors: Osamu Uchino, Hiroaki Kohriyama, Yoshinobu Yamamoto