Optical: systems and elements – Lens – Fluid
Reexamination Certificate
2005-04-22
2008-08-05
Lester, Evelyn A. (Department: 2873)
Optical: systems and elements
Lens
Fluid
C359S666000, C359S667000, C359S820000
Reexamination Certificate
active
07408717
ABSTRACT:
The present invention discloses an optical device comprising a container enclosing an insulating liquid (A) and an electrically susceptible liquid (B), the insulating liquid (A) and the electrically susceptible liquid (B) being immiscible and being in contact with each other via an interface (14), at least one of the liquids (A; B) being at least partially placed in a light path through the container. The optical device further comprises heating means (2, 12, 20) that preferably are responsive to a temperature sensor (30) for heating the insulating liquid (A) and the electrically susceptible liquid (B). Consequently, an optical device is obtained in which the influence of the temperature dependence of the physical properties of the insulating liquid (A) and the electrically susceptible liquid (B) on the behavior of the optical device is reduced, thus yielding an optical device with improved optical characteristics at low temperatures.
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Claude Ganay, et al: Dynamic Study of a Varioptic Variable Focal Lens, Proceedings of the SPIE, vol. 4767, pp. 159-165, XP002335406.
Written Opinion of the International Searching Authority PCT/IB2005/051321.
Helwegen Ivon F.
Hendriks Bernardus H. W.
Kuiper Stein
Renders Christina A.
Van As Marco A. J.
Belk Michael E.
Koninklijke Philips Electronics , N.V.
Lester Evelyn A.
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