Optical element

Patent metadata

Field	Value
Publication number	US-9557455-B2
Application number	US-201214111551-A
Country	US
Kind code	B2
Filing date	Apr 4, 2012
Priority date	Apr 13, 2011
Publication date	Jan 31, 2017
Grant date	Jan 31, 2017

Abstract

An optical element formed by stacking each of two resin layers on a glass substrate, wherein when the second resin layer of the two resin layers counting from the glass substrate is formed, an external circumferential part of the second resin layer is formed so as to be located inward of the outer circumferential part of the first resin layer, which is located closer to the glass substrate than the second resin layer.

First claim

The invention claimed is:

1. An optical element comprising:
a base material; and
a plurality of resin layers stacked and molded onto the base material,
wherein external circumferential parts of those among the plurality of layers constituting the second and subsequent layers, as counted from the base material, being located inward from an external circumferential part of a first layer of the plurality of layers, which is located closer to the base material than the second layer, and
wherein at least one of the second and subsequent resin layers is molded from a resin material having a viscosity of 3000 to 7000 mPa·s.

2. The optical element according to claim 1 , wherein
the plurality of layers constitutes two layers, and
the external circumferential part of the layer constituting the second layer, as counted from the base material, is located inward from the external circumferential part of the first layer, which is located closer to the base material than the second layer.

3. The optical element according to claim 2 , wherein:
the first layer, which has a diffraction grating, is molded onto the base material;
the second layer is stacked and molded onto the first layer so as to become bonded to the diffraction grating;
the resin material used in molding of the first layer has a viscosity of 200 to 800 mPa·s; and
the resin material used in molding of the second layer has a viscosity of 3000 to 7000 mPa·s.

4. An optical element comprising:
a base material; and
a plurality of layers stacked and molded onto the base material,
wherein external circumferential parts of those among the plurality of layers constituting second and subsequent layers, as counted from the base material, being located inward from an external circumferential part of a first layer of the plurality of layers, which is located closer to the base material than the second layer, and
wherein thicknesses of the plurality of layers are respectively 50 μm to 400 μm.

5. The optical element according to claim 4 , wherein
the plurality of layers constitutes two layers,
the external circumferential part of the layer constituting the second layer, as counted from the base material, is located inward from the external circumferential part of the first layer, which is located closer to the base material than the second layer, and
no diffraction grating is formed on the surface of the second layer, which faces opposite the first layer.

6. The optical element according to claim 5 , further comprising a second base material mounted on the second layer,
wherein the second base material is used to mold a surface of the second layer.

7. The optical element according to claim 6 , wherein
no diffraction grating is formed on the surface of the second layer, which is formed by the second base material.

Assignees

• Kurata Toshihiko
• Nikon Corp

Inventors

• Kurata Toshihiko

Classifications

• G02B5/18 Primary

  Diffraction gratings {(holographic optical elements G02B5/32, G03H; integrally combined with optical fibres G02B6/02057; for coupling light guides G02B6/34; integrally combined with optical integrated light guides G02B6/12; grating systems G02B27/44)} · CPC title

• B29L2011/0016

  Lenses · CPC title

• G02B5/1814

  structurally combined with one or more further optical elements, e.g. lenses, mirrors, prisms or other diffraction gratings (G02B5/189 takes precedence) · CPC title

• B29D11/00269 Primary

  Fresnel lenses · CPC title

• B29D11/0073

  Optical laminates · CPC title