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US 7,352,514 B2Granted
Variable focus lens
AssigneeKoninklijke Philips Electronics N.V.
InventorsBernardus Hendrikus Wilhelmus Hendriks, Stein Kuiper, Christina Adriana Renders
Life of this patent
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Abstract
An achromatic electrowetting lens is provided. This is achieved by a particular choice of the parameters n, n2, V, and V2, wherein n is the refractive index and V is the Abbe number. By fulfilling the relations: Formula (I) an achromatization of the electrowetting lens is achieved.
Claims7
A variable focus lens comprising
- a fluid chamber (10) containing a first fluid (A) and a second fluid (B), the fluids being non-miscible and in contact over a meniscus (12),
- means (14,16) for applying an electric field over the fluid chamber such that the shape of the meniscus varies in dependence on the electric field,
- the first fluid having an index of refraction n1 and an Abbe number V1, and the second fluid having an index of refraction n2 and an Abbe number V2, n1 being different from n2, wherein the parameters n1, n2, V1 and V2 comply with the following relation:
- 0.75
- <
- V
- 1
-
- (
- n
- 2
- -
- 1
- )
- V
- 2
-
- (
- n
- 1
- -
- 1
- )
- <
- 1.25
- .
- (
- I
- )
26 more elements
Dependencies are inferred from the claim text.