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
CN101073022AInactive Publication Date: 2007-11-14KONINK PHILIPS ELECTRONICS NV
1 Cites 18 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
KONINK PHILIPS ELECTRONICS NV
Publication Date
2007-11-14
Estimated Expiration
Not applicable · inactive patent

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More