Curable composition, cured product thereof, optical member and optical device
US-2015212300-A1 · Jul 30, 2015 · US
Fresnel lens and optical device provided with same
US10544918B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10544918-B2 |
| Application number | US-201515515523-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 7, 2015 |
| Priority date | Oct 23, 2014 |
| Publication date | Jan 28, 2020 |
| Grant date | Jan 28, 2020 |
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- Title
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Abstract
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Provided is a Fresnel lens which has excellent heat resistance and which can covert light even from a poor-quality semiconductor light sources into uniform, high-quality light and can disperse the resulting light without lowering the central illuminance. The Fresnel lens according to the present invention includes two or more sawtooth prisms in a surface thereof and is made of a cured product of a curable composition containing an epoxy compound (A). Of the sawtooth prisms, a sawtooth prism having a longest inclined side in a cross section has a roughened surface, where the cross section is given by cutting the Fresnel lens in a plane which passes through the center of the Fresnel lens and which is perpendicular to a reference plane of the Fresnel lens.
First claim
Opening claim text (preview).
The invention claimed is: 1. A Fresnel lens comprising two or more sawtooth prisms in a surface thereof, wherein the Fresnel lens is made of a cured product of a curable composition containing (A) an epoxy compound, wherein, of the sawtooth prisms, only a sawtooth prism having a longest inclined side in a cross section has a roughened surface having an arithmetic mean surface roughness (Ra) of 1 to 30 μm, where the cross section is given by cutting the Fresnel lens in a plane which passes through a center of the Fresnel lens and which is perpendicular to a reference plane of the Fresnel lens. 2. The Fresnel lens according to claim 1 , wherein the epoxy compound (A) comprises a compound represented by Formula (a): wherein R 1 to R 18 are each, identically or differently, selected from hydrogen, halogen, an optionally oxygen- or halogen-containing hydrocarbon group, and optionally substituted alkoxy; and X is selected from a single bond and a linkage group. 3. The Fresnel lens according to claim 1 , wherein the curable composition further comprises: (B) an oxetane compound; and (C) a cationic-polymerization initiator, in addition to the epoxy compound (A). 4. The Fresnel lens according to claim 1 , wherein the Fresnel lens has a glass transition temperature of 100° C. or higher.
Assignees
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Classifications
Feeding the material into the mould · CPC title
Electric lighting devices with self-contained electric batteries or cells · CPC title
Simple or compound lenses · CPC title
made of organic materials, e.g. plastics (G02B1/08 takes precedence) · CPC title
of lens shape · CPC title
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- What does patent US10544918B2 cover?
- Provided is a Fresnel lens which has excellent heat resistance and which can covert light even from a poor-quality semiconductor light sources into uniform, high-quality light and can disperse the resulting light without lowering the central illuminance. The Fresnel lens according to the present invention includes two or more sawtooth prisms in a surface thereof and is made of a cured product o…
- Who is the assignee on this patent?
- Daicel Corp
- What technology area does this patent fall under?
- Primary CPC classification G02B3/08. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jan 28 2020 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 3 related publications on this page (citations in our corpus or others sharing the same primary CPC).