CN115427869A

CN115427869A - Lens unit and AR device including the lens unit

Info

Publication number: CN115427869A
Application number: CN202180029192.7A
Authority: CN
Inventors: 徐钦锋; 马珂奇; 杜佳玮; 向恩来; 赵瑜
Original assignee: Ningbo Sunny Opotech Co Ltd
Current assignee: Ningbo Sunny Opotech Co Ltd
Priority date: 2020-04-29
Filing date: 2021-03-15
Publication date: 2022-12-02
Also published as: CN115509015A; CN113568167B; WO2021218453A1; CN115509015B; CN113568167A

Abstract

A lens unit comprising a substrate (1) of optical waveguide material having a first optical plane and a second optical plane opposite the first optical plane; a first diffraction grating region (2) and a second diffraction grating region (3), the diffraction grating region provided on a first optical plane of the substrate (1) constituting the first diffraction grating region (2), the diffraction grating region provided on a second optical plane of the substrate (1) opposite to the first optical plane constituting the second diffraction grating region (3). An incoupling and turning region (35) for incident light is arranged on a first optical plane of the substrate (1), the incoupling and turning region (35) arranged on the first optical plane of the substrate (1) having a uniform grating vector with an outcoupling region arranged on the first optical plane of the substrate (1). The lens unit can remarkably simplify the design and processing difficulty of the lens unit and AR equipment, so that the waveguide sheet structure is flexible and reliably matched with the optical performance requirement and the mechanical structure requirement, the product performance is improved, and the manufacturing cost is reduced.

Description

PCT国内申请，说明书已公开。PCT domestic application, specification has been published.

Claims

A lens unit, comprising:

a substrate of optical waveguide material having a first optical plane and a second optical plane opposite the first optical plane; and

a first diffraction grating region and a second diffraction grating region, wherein the diffraction grating region provided on a first optical plane of the substrate constitutes the first diffraction grating region, and the diffraction grating region provided on a second optical plane of the substrate opposite to the first optical plane constitutes the second diffraction grating region;

wherein an incoupling and turning region for incident light is provided on the first optical plane of the substrate, wherein the incoupling and turning region provided on the first optical plane of the substrate and the outcoupling region provided on the first optical plane of the substrate have a uniform grating vector.
The lens unit according to claim 1, wherein an in-coupling and turning region for incident light is provided on the second optical plane of the substrate, wherein the in-coupling and turning region provided on the second optical plane of the substrate and the out-coupling region provided on the second optical plane of the substrate have a uniform grating vector.
The lens unit of claim 2, wherein the coupling-in and inflection regions provided on the first optical plane of the substrate have at least partially overlapping regions with the coupling-in and inflection regions provided on the second optical plane of the substrate in the plane of the lens unit.
The lens unit of claim 3, wherein the coupling-in and inflection regions provided on the first optical plane of the substrate are axisymmetric to the coupling-in and inflection regions provided on the second optical plane of the substrate in the plane of the lens unit.
The lens unit according to any one of claims 1 to 4, wherein the portion of the diffraction grating area outside the coupling-in and turning area constitutes a coupling-out area for light out of the lens unit.
The lens unit according to any one of claims 1 to 5, wherein the in-coupling and inflection zones are connected with an out-coupling zone located on the optical plane in which they are located.
The lens unit according to any one of claims 1 to 6, wherein the in-coupling and inflection areas are completely surrounded by an out-coupling area located on the optical plane in which they are located.
The lens unit according to any one of claims 1 to 7, wherein the coupling-in and turning area is completely separated from the coupling-out area lying on the optical plane in which it lies, wherein the entire diffraction grating area constitutes the coupling-out area for light out of the lens unit.
The lens unit according to any one of claims 1 to 8, wherein the areas of the first and second diffraction experienced by the incident light within the lens unit are arranged as incoupling and turning areas.
The lens unit according to any one of claims 1 to 9, wherein the grating groove depth and duty cycle of the in-coupling and turning regions are larger than the grating groove depth and duty cycle of the corresponding out-coupling region.
The lens unit of any one of claims 1 to 10, wherein the coupling-in and inflection regions comprise a coupling-in region and an inflection region, wherein the coupling-in region is circular, triangular, rectangular, or elliptical.
The lens unit according to any one of claims 1 to 11, wherein the out-coupling area is provided as a uniform grating having a uniform groove depth and duty cycle.
The lens unit according to any one of claims 1 to 11, wherein the coupling-out area is provided as a varying grating, wherein the farther the coupling-out area is from the corresponding coupling-in and turning area, the larger the groove depth and duty cycle of the grating.
An AR device comprising at least one lens unit according to any one of claims 1 to 13.
The AR device of claim 14, wherein the AR device is AR glasses comprising:

a frame for mounting the lens unit;

a temple for wearing AR glasses;

a left lens unit and a right lens unit mounted in the frame;

a calculation unit for data processing and generating an image signal;

and a micro projector which outputs an image according to the image signal generated by the calculation unit.
The AR device of claim 15, wherein the left and right lens units are comprised of one integral lens unit.
The AR device of any of claims 14 to 16, wherein the AR device comprises a light guiding element that transmits the output image of the pico projector to the incoupling and turning region of the lens unit.
The AR device of any of claims 14 to 17, wherein the lens unit is a chamfered shape.
The AR device of claim 18, wherein the frame has a chamfered shape that matches a chamfered shape of the lens unit.
The AR device according to claim 18 or 19, wherein the frame forms a mounting space for components at a portion corresponding to a chamfered shape of the lens unit.
The AR device according to any of claims 15 to 20, wherein a computing unit, a micro projector, a camera, a position sensor and/or a spatial sensor is mounted in a frame or temple.
The AR device according to any one of claims 15 to 21, wherein a camera, a micro-projector and/or a sensor are mounted in the frame at a midpoint location between the left and right lens units.