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Variable focus lens

A lens, variable technology, applied in the field of variable focus lenses, which can solve problems such as difficult to use, difficult to control, and easy failure of pump equipment

Inactive Publication Date: 2009-08-05
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Electrowetting has the disadvantage that it is difficult to use
However, it can be technically complex and difficult to control given the size of the pumping equipment required, and such pumping equipment is prone to failure

Method used

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  • Variable focus lens
  • Variable focus lens

Examples

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Embodiment Construction

[0015] In the figures, like reference numerals refer to like components and / or components. figure 1 An embodiment of a variable focus lens 10 according to the invention is shown. Lens 10 includes a container having first walls 12A, 12B and a second wall 14 . The first walls 12A, 12B are at least partially transparent. The walls 12A, 12B, 14 of the container define a cavity 16 . A first fluid medium 18 and a second fluid medium 20 are arranged in the chamber 16 . If the lens 10 only functions as the lens 10, the first fluid medium 18 and the second fluid medium 20 are substantially transparent. However, if the lens 10 also acts as a filter, the transparency of the first and / or second fluid medium 18, 20 can be selected corresponding to the desired filtering effect. Between the first medium 18 and the second medium 20 a meniscus 22 is arranged for keeping the first medium and the second medium separated. An optical axis 24 runs through the cavity 16 and is substantially per...

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Abstract

A variable focus lens (10) comprises a container having an interior chamber (16). An optical axis (24) extends through the chamber. A first fluid medium (18) and a second fluid medium (20) are disposed in the chamber. A meniscus (22) is arranged substantially perpendicular to the optical axis and between the first medium and the second medium in said chamber. The variable focus lens further comprises a meniscus control system for controlling a shape of the meniscus. The meniscus control system comprises a first control element (26) and a second control element (28, 30). The first control element is coupled to the meniscus and is moveable in a direction substantially parallel to the optical axis. The first control element and the second control element are configured to interact using an electric field or a magnetic field, thereby using proven and reliable techniques. Further, the interior chamber may be a closed chamber without any elements extending through the wall of the chamber. Hence, a chance of leakage of the fluid media from the chamber is reduced.

Description

technical field [0001] The present invention relates to a variable focus lens, in particular to a lens comprising a first medium and a second medium in a cavity, wherein the shape of the meniscus between the first and second medium is controllable. Background technique [0002] Variable focus lenses of the above-mentioned type are known from the prior art. The shape of the meniscus or interface determines the focal length of the lens. The focal length of the lens is changed by changing the shape of the meniscus. For precise control of focal length, all that is required is precise control of the shape of the meniscus [0003] Various techniques for controlling the meniscus have been proposed in the prior art. For example, it is known to use electrowetting techniques. WO2005 / 096028A proposes the use of piezoelectric actuators to vary the pressure of one of the first and second medium to move the meniscus. JP2004-233945 discloses controlling the amount of the first medium ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B3/14
CPCG02B26/005G02B3/14G02B7/02G02B26/004
Inventor C·多布鲁斯金
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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