Optical: systems and elements – Lens – Fluid
Reexamination Certificate
2005-07-28
2009-08-04
Choi, William C (Department: 2873)
Optical: systems and elements
Lens
Fluid
C359S665000
Reexamination Certificate
active
07570434
ABSTRACT:
The present invention discloses an optical device comprising a container having an inner wall, said container enclosing a first liquid (A) and an electrically susceptible second liquid (B), said liquids (A; B) being immiscible and being in contact with each other via an interface (14), said interface (14) having a contact angle with the inner wall; and an electrode arrangement (2; 12) for controlling the shape of the interface (14) by means of a voltage; the optical device having an operational range in between a first value of the contact angle and a second value of the contact angle, the first value being in a range of 50-110° and the second value being in a range of 70°-130°, the second value being larger than the first value. It has been discovered that the response speed of the interface (14) to a change in position is a function of the contact angle (θ), with a response speed reaching a maximum value around (θ)=90° and at least 75% of this maximum value in the given interval. Consequently, an optical device having advantageous response characteristics is obtained.
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Hendriks Bernardus H. W.
Kuiper Stein
Choi William C
Koninklijke Philips Electronics , N.V.
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