AR Optical Module Relay Lens Group Field of View

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Solution Overview

Problem

Augmented reality optical modules have limited field of view due to the fixed size of lenses, leading to a sense of occlusion when observing real scenes, which negatively impacts user experience.

Innovation Solution

Incorporating a relay lens group and a reflection lens group with transflective lenses to increase the transmission distance of light and prevent lens obstruction, allowing for a broader field of view by converging and reflecting light to superimpose virtual and real-world images effectively.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If the height of the third lens is increased to expand the field of view, then the field of view increases, but the overall contour size and device complexity increase

Engineering Contradiction:

Improvefield of viewVSAvoidoverall contour size

Core Design Contradiction:

Area of stationary objectVSDevice complexity

Solution Approach 1:

The patent introduces a relay lens group that creates a relay image at an intermediate position, effectively adding a dimensional step to the optical path. This allows the light to be redirected via reflection lenses, expanding the field of view without proportionally increasing the overall device size, as the relay image formation occurs in an intermediate spatial dimension

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

Solution Approach 2:

The relay lens group acts as an intermediary between the image source and the final imaging system. By forming a relay image that is then reflected by the reflection lens group, the system achieves expanded field of view while maintaining compact overall dimensions, as the intermediary relay image allows for more flexible optical path routing

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the size of the entrance pupil and image source are fixed, then the system magnification remains constant, but the object distance and image distance become limited

Engineering Contradiction:

Improvesystem magnification stabilityVSAvoidobject distance

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The optical system is segmented into distinct functional groups: the relay lens group that forms the relay image, and the reflection lens group that performs the final imaging. This segmentation allows each group to be optimized independently, enabling extended object and image distances while maintaining stable overall magnification through the coordinated operation of the segmented components

Inventive Principle:

Principle #1Segmentation

3Measurement precision

If lenses are used to converge light, then imaging is achieved, but the lenses block external light and create a sense of occlusion

Engineering Contradiction:

Improveimaging qualityVSAvoidlight blocking

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent merges the functions of light convergence and light reflection by using transflective lenses in the reflection lens group. These lenses can both converge light from the relay image to form the final image and allow external light to pass through, combining multiple optical functions in a single component to eliminate the occlusion effect while maintaining imaging quality

Inventive Principle:

Principle #5Merging (Combining)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This configuration enhances the field of view, reduces the sense of occlusion, and improves user experience by increasing the transmission distance of light without blocking external light, resulting in better imaging performance and clarity.

Implementation Method 1

the relay lens group is configured to receive and converge the light emitted by the image source to form a relay image at least once

Methodology Applied

Scientific EffectLight convergence: Lens

Implementation Method 2

the light of the last relay image is incident to a first surface of the first lens and reflected by the first lens, the reflected light is incident to a first surface of the second lens and reflected by the second lens

Methodology Applied

Scientific EffectLight reflection: Reflection

Implementation Method 3

the ambient light is transmitted through the second lens and the first lens, sequentially, and then emitted to be superimposed on the imaging light

Methodology Applied

Scientific EffectLight transmission: Lens

Data Source

PatentUS11543660B2Augmented reality optical module and augmented reality apparatus

Publication Date: 2023.01.03 SHANGHAI SEEO OPTRONICS TECH CO LTD

AI summary

An augmented reality optical module includes a relay lens group and a reflection lens group. The relay lens group receives and converges the light emitted by the image source. The reflection lens group comprises a first lens and a second lens. The light emitted by the image source is incident to the relay lens group and converged to form the relay image at least once, the light of the last relay image is incident to a first surface of the first lens and reflected, the reflected light is incident to a first surface of the second lens and reflected, and then incident to the first lens and transmitted through the first lens to form imaging light. The ambient light is transmitted in such a manner that the ambient light is transmitted through the second lens and the first lens, sequentially, and then emitted to be superimposed on the imaging light.