Optical element

Patent metadata

Field	Value
Publication number	US-10754157-B2
Application number	US-201615550773-A
Country	US
Kind code	B2
Filing date	Feb 11, 2016
Priority date	Feb 12, 2015
Publication date	Aug 25, 2020
Grant date	Aug 25, 2020

Abstract

A method for producing an optical element includes a) providing a first shell which is transparent in the predetermined wavelength range, b) applying a coating which is optically effective for the predetermined wavelength range onto the structured portion, c) providing a second shell which is transparent in the predetermined wavelength range, which shell has an integral embodiment and a smooth lower side which has a complementary form to the form of the upper side, d) applying an adhesive layer which is transparent in the predetermined wavelength range onto the upper side of the first shell and/or the lower side of the second shell, and e) connecting the upper side of the first shell with the lower side of the second shell by means of the adhesive layer such that a two-shell optical element is produced, in which the optically effective structure is buried.

First claim

The invention claimed is:

1. A method for producing an optical element which is transparent in a predetermined wavelength range and in which an optically effective structure is embedded, the method comprising:
a) providing a first shell which is transparent in the predetermined wavelength range and which is formed in one piece and comprises a structured section on an upper side thereof with the upper side defining a smooth surface except for the structured section;
b) applying a coating which is optically effective for the predetermined wavelength range onto the structured section in order to form the optically effective structure;
c) providing a second shell which is transparent in the predetermined wavelength range and which is formed in one piece and comprises a lower side that is smooth and which has a shape that complements a shape of the upper side;
d) applying an adhesive layer which is transparent in the predetermined wavelength range onto at least one of the upper side of the first shell and the lower side of the second shell; and
e) joining the upper side of the first shell to the lower side of the second shell via the adhesive layer such that a two-shell optical element is formed in which the optically effective structure is buried,
wherein after step b) at least one recess formed by the structured section is filled with a material up to the upper side such that the material is located between the coating and the adhesive layer.

2. The method according to claim 1 , wherein the first and second shells are provided in steps a) and c) in each case as a dimensionally stable shell.

3. The method according to claim 1 , wherein the first and second shells are provided in steps a) and c) such that the upper side and the lower side are curved.

4. The method according to claim 1 , wherein steps a) and b) are performed such that the optically effective structure comprises a plurality of reflective surface pieces spaced apart from each other.

5. The method according to claim 1 , wherein steps a) and b) are performed such that the optically effective structure is one reflective surface piece.

6. The method according to claim 1 , wherein, in step d), the adhesive layer is applied onto an entirety of at least one of the upper side of the first shell and the entire lower side of the second shell.

7. A two-shell optical element, comprising:
a first shell; and
a second shell,
wherein each of the first and second shells are directly joined to each other via an adhesive layer,
wherein an optically effective structure is embedded in the optical element,
wherein the first shell is transparent in a predetermined wavelength range,
wherein the first shell is formed as a single body,
wherein the optically effective structure comprises a coating, which is optically effective for the predetermined wavelength range, applied onto a structured section of the first shell that is defined along a portion of an upper side of the first shell,
wherein at least one recess defined in the structured section is filled with a material up to the upper side such that the material is located between the coating and the adhesive layer,
wherein the upper side of the first shell defines a smooth surface except for the structured section,
wherein the second shell is a single body, is transparent in the predetermined wavelength range, and comprises a lower side that is smooth and which has a shape that complements a shape of the upper side of the first shell,
wherein the upper side of the first shell is joined to the lower side of the second shell via the adhesive layer such that a two-shell optical element is formed in which the optically effective structure is buried.

8. The two-shell optical element of claim 7 , wherein the optically effective structure is one single reflective surface piece.

9. The two-shell optical element of claim 8 , wherein the reflective surface piece is formed curved.

10. The two-shell optical element of claim 7 , wherein the two-shell optical element is formed as a spectacle lens for a display device that can be fitted on the head of a user and generate an image,
wherein the spectacle lens comprises:
a front side and a rear side,
a coupling-in section and a coupling-out section spaced apart from the coupling-in section, and
a light-guiding channel that is suitable for guiding light bundles of pixels of the generated image, which are coupled into the optical element via the coupling-in section of the optical element, in the optical element to the coupling-out section, by which they are coupled out of the optical element,
wherein the coupling-out section comprises the optically effective structure, which brings about a deflection of the light bundles for the coupling-out, and
wherein the front side is formed by the side of the second shell facing away from the first shell and the rear side is formed by the side of the first shell facing away from the second shell.

11. A display device, comprising:
a holder that can be fitted on the head of a user;
an image-generating module, secured to the holder, which generates an image; and
an imaging optical system, secured to the holder, which comprises
the spectacle lens according to claim 10 and which, when the holder is fitted on the head of the user, images the generated image such that the user can perceive it as a virtual image.

Assignees

• Carl Zeiss Smart Optics Gmbh
• tooz technologies GmbH

Inventors

• Hofmann Jens
• Kelch Gerhard
• Krause Wolf
• Puetz Joerg
• Michels Georg

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

• G02B2027/0178

  Eyeglass type (eyeglass details G02C) · CPC title

• G02B5/1861

  Reflection gratings characterised by their structure, e.g. step profile, contours of substrate or grooves, pitch variations, materials (G02B5/1809, G02B5/1828, G02B5/1833, G02B5/1838 and G02B5/1847 take precedence) · CPC title

• B32B37/12

  characterised by using adhesives · CPC title

• B32B2307/412

  Transparent · CPC title