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Beam steering devices

A technology of incident beams and beams, applied in diffraction gratings, instruments, glasses/goggles, etc., to solve problems such as slow changes in orientation

Pending Publication Date: 2021-09-10
E VISION SMART OPTICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Increasing the amplitude of the electric field increases the rotational speed of the liquid crystal molecules, but the alignment layer force is fixed, so the change in orientation occurs relatively slowly when the electric field is removed, independent of the field amplitude

Method used

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Embodiment Construction

[0023] Beams can be redirected or steered by utilizing materials in which the effective birefringence can be changed, resulting in a change in refractive index. When light travels through one material and encounters another material of a different index of refraction, its velocity changes as it propagates into the other material. If light exits one material and enters the next at an angle perpendicular to the cladding between the materials, the light will change speed but not direction of travel. However, if light enters the second material at an angle relative to the cladding between the materials, the direction of propagation of the light will also change. This phenomenon is called refraction and is described by Snell's law.

[0024] Figure 1 shows that at different refractive indices n 2 and n 1 The refraction of light at the interface / boundary between two media, where n 2 >n 1 . Due to the velocity in the second medium (v 2 ) than in the first medium (v 1 ) low, ie...

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Abstract

A beam steering device includes a substrate with a first refractive index that defines a cavity, an electroactive material in the cavity that has a variable refractive index, and two sets of opposing overlays. The overlays in one set of opposing overlays are parallel to each other, while the overlays in the other set are tilted with respect to each other. This allows one or more electric fields between the overlays to be used to align the electroactive material in two different directions to change its refractive index, allowing for a faster speed of beam steering through refraction than conventional approaches.

Description

[0001] Cross References to Related Applications [0002] This application requests Serial No. 62 / 769,052, entitled "FAST BEAM STEERING DEVICE USING MULTI-DIMENSIONAL ELECTRIC FIELDSAND OVER-DRIVING," filed November 19, 2018 Priority to US Provisional Application, the entire disclosure of which is incorporated herein by reference. technical field Background technique [0003] Current liquid crystal-based beam steering devices use electric fields to change the orientation of liquid crystal molecules. The liquid crystal molecules are aligned with the direction of the electric field. When the electric field is removed, the anchoring force created by the alignment layer returns the liquid crystal molecules to their original orientation. Increasing the amplitude of the electric field increases the rotational speed of the liquid crystal molecules, but the alignment layer force is fixed, so the change in orientation occurs relatively slowly when the electric field is removed, ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/18G02B27/09G02F1/1337G02F1/1343G02F1/19
CPCG02F1/29G02F1/13G02C7/04G02C11/10G02C7/083G02B26/06G02B26/0875G02B27/0172G02C7/022G02C7/041G02F1/133502G02F1/2955G02F2203/24G02F1/137
Inventor A·万海格滕
Owner E VISION SMART OPTICS INC