Multifocal system using adaptive lenses

Patent metadata

Field	Value
Publication number	US-11579511-B2
Application number	US-202117399735-A
Country	US
Kind code	B2
Filing date	Aug 11, 2021
Priority date	Nov 1, 2018
Publication date	Feb 14, 2023
Grant date	Feb 14, 2023

Abstract

A device is provided. The device includes a first lens assembly controllable to switch between a first plurality of optical powers. The first lens assembly includes a plurality of directly optically coupled lenses, and is configured to converge or diverge a light transmitted therethrough. The device also includes a second lens assembly coupled with the first lens assembly, and controllable to switch between a second plurality of optical powers that are opposite to the first plurality of optical powers.

First claim

What is claimed is:

1. A device, comprising:
a transmissive first lens assembly controllable to switch between a first plurality of optical powers, wherein the first lens assembly comprises a plurality of directly optically coupled first lenses, and is configured to transmit a light while converging or diverging the light based on a polarization of the light; and
a second lens assembly coupled with the first lens assembly, and comprising a plurality of directly optically coupled second lenses, wherein the second lens assembly is controllable to switch between a second plurality of optical powers that are opposite to the first plurality of optical powers.

2. The device of claim 1 , further comprising a wave plate disposed between the first lens assembly and the second lens assembly.

3. The device of claim 2 , wherein the wave plate is configured to convert a first light having a first polarization received from the first lens assembly to a second light propagating toward the second lens assembly, the second light having a second polarization orthogonal to the first polarization.

4. The device of claim 1 , wherein at least one first lens of the plurality of directly optically coupled first lenses is switchable between a non-zero optical power state and a zero optical power state.

5. The device of claim 1 , wherein at least one first lens of the plurality of directly optically coupled first lenses is a circular polarization dependent active liquid crystal (“LC”) lens.

6. The device of claim 5 , wherein the at least one first lens is configured to converge the light when the light is a circularly polarized incident light having a predetermined handedness, and diverge the light when the light is a circularly polarized incident light having a handedness that is opposite to the predetermined handedness.

7. The device of claim 1 , wherein at least one first lens of the plurality of directly optically coupled first lenses is a linear polarization dependent active liquid crystal (“LC”) lens.

8. The device of claim 1 , wherein at least one first lens of the plurality of directly optically coupled first lenses is a polarization independent active liquid crystal (“LC”) lens.

9. The device of claim 1 , wherein:
at least one first lens is switchable between a non-zero optical power state and a zero optical power state, and
at least one second lens is switchable between a non-zero optical power state and a zero optical power state.

10. The device of claim 9 , wherein both of the at least one first lens and the at least one second lens are circular polarization dependent active liquid crystal (“LC”) lenses, linear polarization dependent active LC lenses, or polarization independent active LC lenses.

11. The device of claim 9 , wherein the at least one first lens is substantially identical to the at least one second lens.

12. The device of claim 1 , wherein the second lens assembly has the same number of lenses as the first lens assembly.

13. The device of claim 1 , wherein the first lens assembly includes a passive lens.

14. A method, comprising:
receiving a first light by a transmissive first lens assembly controllable to switch between a first plurality of optical powers, wherein the first lens assembly comprising a plurality of directly optically coupled first lenses; and
converging or diverging the first light while transmitting the first light, by the first lens assembly based on a polarization of the first light, to a second lens assembly, the second lens assembly comprising a plurality of directly optically coupled second lenses and controllable to switch between a second plurality of optical powers that are opposite to the first plurality of optical powers.

15. The method of claim 14 , further comprising:
converging or diverging the first light while transmitting the first light, by the first lens assembly based on the polarization of the first light, to a wave plate disposed between the first lens assembly and the second lens assembly; and
converting, by the wave plate, the first light into a second light propagating towards the second lens assembly.

16. The method of claim 15 , further comprising:
determining an optical power of the second lens assembly; and
determining, based on the determined optical power of the second lens assembly, an optical power for the first lens assembly,
wherein the optical power of the first lens assembly is a first optical power, and the optical power of the second lens assembly is a second optical power opposite to the first optical power.

17. The method of claim 16 , further comprising:
converging or diverging the first light while transmitting the first light, by the first lens assembly having the first optical power, based on the polarization of the first light, to the wave plate; and
diverging or converging the second light while transmitting the second light, by the second lens assembly having the second optical power, based on the polarization of the second light.

18. The method of claim 16 , wherein at least one first lens of the plurality of directly optically coupled first lenses in the first lens assembly is switchable between a non-zero optical power state and a zero optical power state, and the method further comprises:
configuring an optical state of the at least one first lens to provide the first optical power.

19. The method of claim 18 , wherein the at least one first lens is one of a circular polarization dependent active liquid crystal (“LC”) lens, a linear polarization dependent active LC lens, or a polarization independent active LC lens.

Assignees

• Meta Platforms Tech Llc

Inventors

• Yaroshchuk Oleg
• Wang Junren
• Lu Lu

Classifications

• G02F1/294

  Variable focal length devices · CPC title

• G02B27/0172 Primary

  characterised by optical features · CPC title

• G02F1/31

  Digital deflection, {i.e. optical switching}(G02F1/33 takes precedence) · CPC title

• G02F1/29 Primary

  for the control of the position or the direction of light beams, i.e. deflection · CPC title

• G02F2203/07

  Polarisation dependent · CPC title