Hybrid lens with a silicone fresnel surface

Patent metadata

Field	Value
Publication number	US-10598935-B2
Application number	US-201715432793-A
Country	US
Kind code	B2
Filing date	Feb 14, 2017
Priority date	Feb 14, 2017
Publication date	Mar 24, 2020
Grant date	Mar 24, 2020

Abstract

A method for making a hybrid lens includes providing, in a mold having a first Fresnel pattern, (i) a first lens and (ii) a silicone material comprising silicone and curing the silicone material in the mold to form a hybrid Fresnel lens. The cured silicone material is mechanically coupled with the first lens; and the cured silicone material has a second Fresnel pattern that corresponds to the first Fresnel pattern. A hybrid lens made by this method is also described. A hybrid lens includes a first lens mechanically coupled with a cured silicone material. The cured silicone material has a Fresnel pattern on a surface that faces away from the first lens.

First claim

What is claimed is:

1. A hybrid Fresnel lens, comprising:
a first lens having two opposing optical surfaces, the first lens being partially embedded in a cured silicone material so that the two opposing optical surfaces are in contact with the cured silicone material and the first lens is mechanically coupled with the cured silicone material, wherein the cured silicone material has a Fresnel pattern on a surface that faces away from the first lens.

2. The hybrid Fresnel lens of claim 1 , wherein:
the first lens has one or more convex surfaces; and
a first convex surface of the one or more convex surfaces faces away from the cured silicone material.

3. The hybrid Fresnel lens of claim 2 , wherein:
the first lens is one of: a plano-convex lens, a convex-concave lens, and a convex-convex lens.

4. The hybrid Fresnel lens of claim 2 , wherein:
90% or more of the first convex surface is exposed from the cured silicone material.

5. The hybrid Fresnel lens of claim 1 , wherein:
the Fresnel pattern is defined by a surface profile function; and
a derivative of the surface profile function has one or more discontinuities.

6. The hybrid Fresnel lens of claim 1 , wherein:
the hybrid Fresnel lens is rotationally symmetric.

7. The hybrid Fresnel lens of claim 1 , wherein:
at least a portion of a first optical surface of the two opposing optical surfaces and a portion, less than all, of a second optical surface of the two opposing optical surfaces are in contact with the cured silicone material.

8. The hybrid Fresnel lens of claim 1 , wherein:
the Fresnel pattern has a baseline that is different from a contour of an optical surface of the two opposing surfaces of the first lens facing the cured silicone material.

9. The hybrid Fresnel lens of claim 8 , wherein:
the baseline of the Fresnel pattern has a convex shape.

Assignees

• Facebook Tech Llc

Inventors

• Yoon Youngshik
• Cho Richard Han Soo

Classifications

• G02B27/0176

  characterised by mechanical features · CPC title

• G02B3/08

  with discontinuous faces, e.g. Fresnel lens {(diffractive Fresnel lenses G02B5/1876)} · CPC title

• B29D11/00269 Primary

  Fresnel lenses · CPC title

• G02B2027/0178

  Eyeglass type (eyeglass details G02C) · CPC title

• G02B2027/011

  comprising device for correcting geometrical aberrations, distortion · CPC title