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Diffractive optical element and optical device having the same

A diffractive optical element and element technology, applied in optical elements, diffraction gratings, optics, etc., can solve the problems of poor diffraction efficiency, poor diffraction efficiency, image flare phenomenon and performance degradation, etc.

Active Publication Date: 2014-12-24
LG INNOTEK CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, DOE has the following problems: poor diffraction efficiency occurs depending on the wavelength band of incident light and the incident angle of the lens, which causes the flare phenomenon of the image and performance degradation
However, when only a single DOE is used, the difference in diffraction efficiency according to wavelength and incident angle is not improved

Method used

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  • Diffractive optical element and optical device having the same
  • Diffractive optical element and optical device having the same
  • Diffractive optical element and optical device having the same

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Embodiment Construction

[0048] While the invention is capable of being modified in various ways and taking various alternative forms, specific embodiments thereof are shown in the drawings and described in detail below as examples.

[0049] Terms including ordinal numbers such as first and second may be used to describe various elements, but the elements are not limited by the terms.

[0050] The term is used only to distinguish one element from another. For example, a second element could be termed a first element, and a first element could be termed a second element, without departing from the scope of the present invention.

[0051] It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may be present.

[0052] In contrast, when an element is referred to as being "directly connected" or "directly coupled" to another element, there are no intervening element...

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Abstract

The invention relates to a diffractive optical element and optical device having the same. There are provided a diffractive optical element in which a diffraction pattern is formed on at least one surface, wherein a height of the diffraction pattern changes from a center to an edge of the one surface, and a height of a first diffraction pattern element formed at the center and a height of a second diffraction pattern element formed at the edge are different, and an optical device having the same.

Description

technical field [0001] The present invention relates to a diffractive optical element in which diffraction efficiency is uniform according to wavelength and incident angle. Background technique [0002] In a diffractive optical element (DOE), chromatic aberration occurs in the opposite manner to that of a refractive optical system with the same sign power (power). This is a physical phenomenon in which chromatic aberration based on light of a reference wavelength appears oppositely at a refractive surface and a diffractive surface in an optical system. [0003] DOE is advantageous in that aberration correction is easier than in existing refractive optical systems, the height of a lens assembly can be reduced, it can be manufactured in a small size, and product cost can be reduced in terms of the reduction in the number of lenses. [0004] However, the DOE has problems in that poor diffraction efficiency occurs depending on the wavelength band of incident light and the incid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/18
CPCG02B5/1876G02B27/4288
Inventor 李尚勋李桃源
Owner LG INNOTEK CO LTD