Method and apparatus for driving a liquid lens

Details Method and apparatus for driving a liquid lens Method and apparatus for driving a liquid lens

2011-03-01

2011-03-01

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C250S216000

Reexamination Certificate

active

07897899

ABSTRACT:
A liquid lens driver10has DC-DC converter12, oscillator14, pulse width modulator16, and control logic circuit18. The output buffer circuit30divides converter output voltage Vsof a prescribed amplitude (voltage level), input as the power source voltage, into bipolar, that is, positive
egative, 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 driver10, pulse width modulation (PWM) output voltages Out-A, Out-B are applied as driving voltage VLon electrodes104, 108of liquid lens100.

REFERENCES:
patent: 7532303 (2009-05-01), Kato et al.

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