Disclosed is a diffractive optical element which includes a plurality of diffraction gratings being made of materials having different dispersions and being formed in accumulation, wherein at least one of the diffraction gratings has a varying grating thickness.

Diffractive optical element and optical system having the same

PROBLEM TO BE SOLVED: To provide a diffraction optical element of which the diffraction efficiency changes little even when an environmental condition changes. SOLUTION: The diffraction optical element 1 is provided in which a plurality of diffraction gratings are laminated and the maximum difference of length among optical paths of light passing through the plurality of diffraction gratings is integer multiples of a plurality of wavelengths, wherein the diffraction optical element 1 is provided with a first diffraction grating 6 made of a resin material in which inorganic fine particles are dispersed, and a second diffraction grating 7 made of a material whose organic matter composition is substantially the same as that of the resin material. COPYRIGHT: (C)2006,JPO&NCIPI

Diffraction optical element and optical system having same

PROBLEM TO BE SOLVED: To provide a diffraction optical element, optical system, and an optical instrument in which unnecessary light is suppressed.SOLUTION: In the diffraction optical element of tightly adhered three-layer structure, a grating wall surface corresponding to a second diffraction grating is arranged at a plane extended from a first grating wall surface or a low refractive index region side of the first diffraction grating from a plane extended from a grating wall surface of the first diffraction grating. In addition, +1.3×|m|<|m1|<+2.0×|m|, -1.0×|m|<-|m2|<-0.3×|m|, 0.94×|m|<|m1+m2|<|1.05×m| are satisfied, wherein m denotes a design order and m1=(nd2-nd1)d1/λd and m2=(nd3-nd2)d2/λd, nd1-3 denote refractive indexes to the d lines of the materials 151-3 respectively, d1 and d2 denote grating heights of the first and second diffraction gratings respectively, and λd denotes the wavelength of the d line.

Diffraction optical element, optical system and optical equipment

PROBLEM TO BE SOLVED: To provide a diffractive optical element suppressing deterioration in image performance.SOLUTION: This diffractive-optical element used as a lens of an optical system includes: a first diffraction grating provided with a plurality of first grating surfaces and first grating wall surfaces which are concentrically formed at a predetermined grating pitch with an optical axis of the lens defined as a center; a second diffraction grating provided with a plurality of second grating surfaces and second grating wall surfaces which are concentrically formed at the predetermined grating pitch with the optical axis of the lens defined as the center; and a plurality of light shielding members which are concentrically formed at the predetermined grating pitch with the optical axis of the lens defined as the center. In the cross section of the lens including the optical axis, when the position of the first grating wall surfaces is defined as a criterion out of regions divided by the first grating wall faces and extension lines of the first grating wall surfaces, the width wH of each light shielding member disposed in a high refractive index region and the width wL of the light shielding member disposed at a low refractive index region are set in an appropriate relation.

Diffractive optical element, optical system and optical equipment

PROBLEM TO BE SOLVED: To suppress an unintentional image from being observed.SOLUTION: Optical sheets 30, 40 are used for an optical panel 20 that changes a propagation direction of light L1 from an original image 91 incident to one side of the panel and transmits the light to the other side to form an image 92 on the other side. The optical sheets 30, 40 have a plurality of projections 35, 45, respectively, arranged in an arrangement direction da, db and extending in an extension direction intersecting the arrangement direction da, db. Each projection 35, 45 has a reflection surface 36, 46 to reflect the light L1 from the original image 91 and a counter surface 37, 47 opposing to the reflection surface 36, 46; and the counter surface 37, 47 comprises a rugged surface 39, 49.SELECTED DRAWING: Figure 3

Optical sheet and optical panel

PROBLEM TO BE SOLVED: To obtain a diffractive optical element which ensures high diffraction efficiency in a wide wavelength range and is little in flare, and to obtain an optical system with the element. SOLUTION: The diffractive optical element is provided with a stairs-shaped step part at the edge part of a diffraction grating.

Diffractive optical element and optical system using the same

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Diffractive optical element and optical system using the same