Patent
Diffractive optical element having high diffraction efficiency at plural wavelengths and image-pickup optical system using the same
Hidemi Takayama
- 19 Aug 2011
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TL;DR: A diffractive optical element in which the maximum optical path length of light is an integral multiple of each of a plurality of wavelengths includes a diffractive grating configured by combining a first member and a second member having a refractive index lower than a as discussed by the authors and having dispersion higher than a dispersion of the first member.
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Abstract: A diffractive optical element in which the maximum optical path length of light is an integral multiple of each of a plurality of wavelengths includes a diffractive grating configured by combining a first member and a second member having a refractive index lower than a refractive index of the first member and having dispersion higher than a dispersion of the first member. At least one of the first member and the second member is made of a glass material, and the diffractive grating is formed by the glass material which is heated to be softened using a thermal press forming, and has a concave grating shape that has a grating height increasing from a central part toward a peripheral part.
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Citations
Patent
Rear conversion lenses
Shuji Yoneyama
- 13 Jan 2016
TL;DR: A rear conversion lens, which may include a plurality of lenses may be disposed at a side of master lenses facing an image side for varying a focal length, and may include: a first lens having a positive refractive power; a second lens having biconcave shape; a third lens having positive as mentioned in this paper.
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References
Patent
Composite material and optical component using the same
Yuka Okada,Tsuguhiro Korenaga,Masaaki Suzuki,Norihisa Takahara +3 more
- 04 Sep 2006
TL;DR: In this article, a composite material consisting of a resin and inorganic particles has been proposed, which has a good balance between high refractive index and low wavelength dispersibility and has excellent moldability.
61
Patent
Laminated diffraction optical element
Hideo Ukuda,Reiko Kubota +1 more
- 16 Jan 2008
TL;DR: In this paper, a multi-layered diffraction optical element consisting of a transparent substrate, a first layer having a diffraction grating shape at least on one face and comprised of a relatively high refractive index and low dispersion material, and a second layer having an inorganic fine particle different from the first fine particle.
31
Patent
Diffractive optical element, optical system, and optical apparatus
Reona Ushigome
- 10 Jun 2011
TL;DR: A diffractive optical element includes a first diffraction and a second diffraction grating which are made of materials different from each other and are stacked in an optical axis direction.
26
Patent
Diffractive optical element and manufacturing method thereof
Akiko Murata,Yuka Okada +1 more
- 13 May 2009
TL;DR: A diffractive optical element as discussed by the authors is composed of a first optical material containing a first resin, and having a diffraction grating 2 on a surface thereof; and an optical adjustment layer 3 being composed of an second optical material including a second resin.
23
Patent
Composite optical element
Jun Murata,Takano Toshiaki +1 more
- 06 Jun 2007
TL;DR: In this article, a composite optical element including a first optical component and a second optical component coupled to the first optical components is described, where the second component is made of a material different from the first glass.
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