Electronic device with stacked metasurface lenses
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Diffraction grating lens and imaging device in which the same is used
US8995058B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8995058-B2 |
| Application number | US-201113395585-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 12, 2011 |
| Priority date | Aug 19, 2010 |
| Publication date | Mar 31, 2015 |
| Grant date | Mar 31, 2015 |
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- Title
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Abstract
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A diffraction grating lens according to the present invention is a diffraction grating lens 11 including: a lens body 12 ; and a plurality of diffraction steps relative to a base shape and a plurality of diffraction gratings 13 interposed between the diffraction steps, provided on a surface of the lens body 12 . The lens body 12 is made of a first material having a refractive index n 1 (λ) at a used wavelength λ; the diffraction grating 13 is in contact with air; and the relationship of an inequality below is satisfied, where d is a design step length of the diffraction steps, and m is an order of diffraction. Each of the plurality of annular zones includes an intermediate portion and a pair of end portions sandwiching the intermediate portion along a radial direction, and in at least one of the plurality of annular zones, either one of a recess 18 and a protrusion 19 is provided in at least a portion of one of the pair of end portions, and the other one of the recess 18 and the protrusion 19 is provided in at least a portion of the other of the pair of end portions. Between two kinds of diffraction steps 17 A and 17 B of the diffraction grating 13 , one is provided at a position where the phase difference from the base shape given the design wavelength λ 0 is not 2 nmπ. 0.9 d ≤ m · λ n 1 ( λ ) - 1 ≤ 1.1 d
First claim
Opening claim text (preview).
The invention claimed is: 1. A diffraction grating lens comprising: a lens body; and a diffraction grating provided on a surface of the lens body, the diffraction grating having a plurality of diffraction steps relative to a base shape and a plurality of concentric annular zones each sandwiched by an adjoining pair among the plurality of diffraction steps, wherein, the lens body is made of a first material having a refractive index n 1 (λ) at a used wavelength λ; the diffra…
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Physics · mapped topic
- G02B5/1814Primary
Physics · mapped topic
Physics · mapped topic
Physics · mapped topic
Physics · mapped topic
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- What does patent US8995058B2 cover?
- A diffraction grating lens according to the present invention is a diffraction grating lens 11 including: a lens body 12 ; and a plurality of diffraction steps relative to a base shape and a plurality of diffraction gratings 13 interposed between the diffraction steps, provided on a surface of the lens body 12 . The lens body 12 is made of a first material having a refractive index n 1 …
- Who is the assignee on this patent?
- Okada Yuka, Ando Takamasa, Korenaga Tsuguhiro, and 1 more
- What technology area does this patent fall under?
- Primary CPC classification G02B5/1814. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Mar 31 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).