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Ghost image elimination in an image sensor employing a variable focus lens

A technology of image sensor and zoom lens, which is applied in the direction of lens, instrument, optics, etc., can solve the problem of very sensitive ghosting

Inactive Publication Date: 2009-04-15
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is a particular problem where the housing 5 is made of polished metal, since the imaging module is very sensitive to the occurrence of ghosting

Method used

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  • Ghost image elimination in an image sensor employing a variable focus lens
  • Ghost image elimination in an image sensor employing a variable focus lens
  • Ghost image elimination in an image sensor employing a variable focus lens

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Experimental program
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Embodiment Construction

[0046] First, the principle of operation of a zoom (or "electrowetting") lens as described in International Patent Application No. WO 03 / 069380 will be explained. Figures 2-4 show a zoom lens comprising a cylindrical first electrode 2 forming a capillary, sealed with a transparent front element 4 and a transparent back element 6 to form a fluid chamber 5 containing two fluids. Electrode 2 may be a conductive coating applied on the inner wall of the tube.

[0047] In this exemplary design, the two fluids consist of two immiscible fluids with an electrically insulating first fluid A (such as silicone oil or alkane, also referred to herein as "oil") and a polar and / or conductive Form composition of the second fluid B (such as the water that comprises salt solution). The two fluids can be set to have equal densities so that the lens functions independently of orientation, ie independent of gravitational effects between the two fluids. This can be achieved, for example, by approp...

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PUM

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Abstract

In an image sensor incorporating a variable focus lens of the electrowetting type, means are provided for reducing or substantially eliminating the occurrence of ghost images. A variable focus lens of the above-mentioned type comprises a housing (5) provided with a first fluid (A) and an axially displaced second fluid (B), the two fluids being non-miscible, in contact over a meniscus (14) and having different indices of refraction. First and second electrodes (2, 12) are provided and the shape of the to meniscus (14) is controllable in dependence on the application of a voltage between the first and second electrodes (2, 12). Various methods of reducing or substantially eliminating the occurrence of ghost images are prepared, including the alteration of the optical properties of an inner and / or outer wall of the housing (5), to reduce the reflectivity thereof, provision of means in the image sensor to intercept ghosting and appropriate selection of the material or combination of materials of which the housing (5) is formed.

Description

technical field [0001] The present invention relates to ghosting reduction / elimination in zoom lenses, and more particularly to ghosting reduction / elimination in zoom lenses of the type comprising a first fluid and a second fluid, wherein the fluids are immiscible, have different refraction rate and is in contact with a meniscus where the lens function of the zoom lens can be selectively controlled. Background technique [0002] A fluid is a substance that changes its shape in response to any compressive force, tends to flow or conform to the shape of its chamber, and includes gases, liquids, and mixtures of solids and liquids capable of flow. Furthermore, the lens function of a zoom lens lies in its ability to focus (converge or diverge) one or more wavelengths of light. [0003] In camera modules, so-called ghost images can occur when unintentional reflections appear on the surfaces that make up the lens stack, and these reflections can reach the image sensor after being ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B27/00G02B3/14
CPCG02B27/0018G02B26/005G02B3/14
Inventor B·H·W·亨德里克斯M·A·J·范阿斯S·凯帕
Owner KONINK PHILIPS ELECTRONICS NV