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Variable focus lens

A lens and variable technology, applied in the field of optical devices that change radiation beams, can solve problems such as hindering the performance of variable focus lenses, and achieve the effects of effective and fast switching of focal power and a wide range of focal powers

Inactive Publication Date: 2009-07-22
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This hinders the performance of variable focus lenses for specific applications

Method used

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Examples

Experimental program
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Embodiment Construction

[0039] Figures 1 and 2 schematically show a variable focus lens 1 according to the prior art, which is disclosed by International Patent Application WO 03 / 069380.

[0040] The variable focus lens 1 comprises a cylindrical first electrode 2 sealed by a transparent front element 3 and a transparent rear element 4 forming a liquid chamber 5 .

[0041] The liquid chamber 5 contains two immiscible liquids, an electrically insulating first fluid A, such as silicone oil or alkanes, and a conductive second fluid B, such as water in a saline solution. The two fluids are separated from each other by a liquid meniscus lens 6 which, as shown, has an aspherical curvature structure that is rotationally symmetric about the optical axis OA of the lens 1 . Both fluids preferably have equal densities so that the structure of the meniscus lens 6 can be controlled independently of the orientation of the variable lens 1 . The first fluid A has a first refractive index and the second fluid B has a...

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Abstract

Optical apparatus for modifying a radiation beam, the apparatus including a variable focus lens (1) comprising a first fluid (A) and a second fluid (B) wherein the fluids are immiscible and are separated from each other by a fluid meniscus (6; 106; 206; 306) which is configurable into a configuration which is arranged to modify a predetermined vergence of an input radiation beam (15; 32; 33) and a focus control system. The optical apparatus is characterised in that the apparatus comprises a first redirector arranged to redirect the radiation beam, after having passed once through the fluid meniscus, back towards the fluid meniscus, and a second redirector arranged to further redirect the radiation beam, after having passed twice through the meniscus, back towards the fluid meniscus, wherein the configuration is arranged to further modify the vergence of the radiation beam following each of the redirections, the further modifications being arranged to provide the variable focus lens with an amplified focal power.

Description

technical field [0001] The present invention relates to optical arrangements for varying a radiation beam, and more particularly to optical arrangements for providing variable focus lenses with magnified optical power. Background technique [0002] Variable focus lenses are known in the prior art. For example, International Patent Application WO 03 / 069380 discloses a variable focus lens comprising two immiscible liquids separated from each other by a liquid meniscus lens. Each liquid has a different refractive index, and the meniscus acts as a lens for the radiation beam passing through the meniscus. Electrowetting force is used to change the curvature of the meniscus lens to change the optical power of the lens. The lenses provide a range of different optical powers between a maximum optical power and a minimum optical power. [0003] Variable focus lenses such as those described above may be used in applications such as cameras and devices for scanning optical record ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B3/14
CPCG02B26/005G02B3/14G02B7/04G02B1/06G02B2207/115
Inventor C·多布鲁斯金J·W·威克普B·H·W·亨德里克斯
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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