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Optical device with fresnel structure

A Fresnel structure, optical device technology, applied in optical components, optics, nonlinear optics, etc., can solve problems such as inability to achieve the effect of simplifying the manufacturing process

Inactive Publication Date: 2007-11-14
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it cannot be used in applications that use different wavelengths of light, such as cameras using natural light

Method used

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  • Optical device with fresnel structure
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Embodiment Construction

[0024] An optical device according to the invention is depicted in FIG. 1 . The optical device includes a Fresnel structure 101 and a stepped structure 102 . Fresnel structures are well known to those skilled in the art. For example, Fresnel lenses are described in J.J.M. Braat, "Microscope Objectives for Optical Disk Systems", Proceedings of the International Conference on "Theory and Applications of the 'Huygens' Principle 1690-1990", (TheHague / Scheveningen , 1990, Elsevier Science Publishers B.V.), editors: H.Blok, H.A.Ferweda, H.K.Kuiken, pp. 33-63. In FIG. 1 , conventional lenses used to make the Fresnel structure 101 are shown with thin lines, while the Fresnel structure 101 and the stepped structure 102 are shown with thick lines. Portions of the conventional lens that have been removed to make the Fresnel structure 101 are shown in dashed lines.

[0025] In Fig. 1, the Fresnel structure 101 and the stepped structure 102 are shown as distinct components. Nevertheles...

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Abstract

The invention relates to an optical device comprising a Fresnel structure (101). The Fresnel structure is designed such that at least one phase jump is introduced in a radiation beam that passes through said Fresnel structure. The optical device further comprises a stepped structure (102) for compensating for said phase jump.

Description

technical field [0001] The present application relates to an optical device including a Fresnel structure, especially an optical device including a variable focal length lens, and the lens includes a Fresnel device. [0002] The application particularly relates to optical devices requiring variable focal lengths, such as cameras. Background technique [0003] US Patent No. 4,904,063 discloses a liquid crystal lens comprising a Fresnel structure in contact with a liquid crystal material, wherein the refractive index of the liquid crystal material can be changed by applying a voltage. This can change the focal length of the liquid crystal lens. As the patent explains, using Fresnel lenses instead of conventional lenses can reduce the thickness of the liquid crystal material. This reduces the time required to switch from one focal length to another, since the switching time of the liquid crystal material depends on its thickness. [0004] A Fresnel lens is obtained by removi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B3/08G02B3/14G02B27/42G02F1/29G11B7/135G02B5/18
CPCG02F1/133371G02F1/29G02B27/4277G02B27/4261G02B5/1814G02B27/4272G02B3/08G02B5/1833G02B3/14G02B27/42
Inventor B·亨德里克斯E·维斯特根
Owner KONINK PHILIPS ELECTRONICS NV
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