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Patent Searching and Data


Title:
LIQUID LENS FEEDBACK AND CONTROL
Document Type and Number:
WIPO Patent Application WO/2018/187578
Kind Code:
A3
Abstract:
Control systems for liquid lenses can use feedback control using one or more measured parameters indicative of a position of the fluid interface in the liquid lens. Capacitance between a fluid and an electrode in the liquid lens can vary depending on the position of the fluid interface. Current mirrors can be used for making measurements indicative of the capacitance and/or the fluid interface position. The liquid lens can be calibrated using the measurements indicative of capacitance and/or fluid interface position as the voltage is driven across an operational range. A control system can use pulse width modulation (PWM) for driving a liquid lens, and a carrier frequency for the PWM signals can be varied to control power consumption in the liquid lens. The slew rate can be adjustable to control power consumption in the liquid lens.

Inventors:
KAMINSKI JANN PAUL (US)
KARAM RAYMOND MILLER (US)
LYON ROBERT BRUCE (US)
PIKULA DRAGAN (US)
RICKETTS DANIEL OHEN (US)
Application Number:
PCT/US2018/026268
Publication Date:
January 17, 2019
Filing Date:
April 05, 2018
Export Citation:
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Assignee:
CORNING INC (US)
International Classes:
G02B3/12; G02B13/00; G02B3/14; G02B26/00; G02B27/64
Domestic Patent References:
WO2006054198A12006-05-26
WO2010061300A12010-06-03
WO2006048187A12006-05-11
Foreign References:
EP2071367A12009-06-17
US20020176148A12002-11-28
US20070165159A12007-07-19
Attorney, Agent or Firm:
HOOD, Michael A. (US)
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