Multi-element Optical Lens for Head-Mounted Display
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Solution Overview
Problem
Existing optical lenses for head-mounted display devices face challenges in achieving a balance between small size, light weight, large viewing angle, and high resolution, while also addressing thermal drift issues that affect image quality.
Innovation Solution
The design incorporates a sequence of lenses with specific refractive powers (positive, negative, positive, and positive) and aspherical shapes, optimized to minimize cross-sectional area convergence and maintain thermal stability, using materials like glass and plastic aspherical lenses to achieve a compact, high-resolution, and thermally stable optical lens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optical lens design is made more complex to achieve larger viewing angle and high resolution, then the viewing angle and resolution are improved, but the size and weight of the optical lens increase
Solution Approach 1:
The optical lens is divided into multiple lens elements (first lens, second lens, third lens, fourth lens) with different refractive powers arranged in sequence. Each lens element contributes to specific optical functions, allowing the system to achieve high resolution and large viewing angle through the combined effect of segmented components rather than a single complex lens
Solution Approach 2:
The patent employs lenses with different refractive powers and materials (including glass and plastic aspherical lenses) to construct the optical system. This composite approach allows optimization of each lens element's properties to achieve overall system performance while controlling weight through material selection
2Measurement precision
If the optical lens design is made more complex to achieve larger viewing angle and high resolution, then the viewing angle and resolution are improved, but the volume of the optical lens increases
Solution Approach 1:
The optical lens is divided into multiple lens elements (first lens, second lens, third lens, fourth lens) with different refractive powers arranged in sequence. Each lens element contributes to specific optical functions, allowing the system to achieve high resolution and large viewing angle through the combined effect of segmented components rather than a single complex lens
Solution Approach 2:
The patent utilizes aspherical lens surfaces to introduce dimensional complexity in the shape of lens elements rather than increasing the overall volume. The aspherical design allows light rays to be focused more efficiently in three-dimensional space, achieving high resolution without proportionally increasing lens volume
3Adaptability or versatility
If the optical lens design is made more complex to achieve larger viewing angle, then the viewing angle is improved, but the weight of the optical lens increases
Solution Approach 1:
The optical lens is divided into multiple lens elements (first lens, second lens, third lens, fourth lens) with different refractive powers arranged in sequence. Each lens element contributes to specific optical functions, allowing the system to achieve high resolution and large viewing angle through the combined effect of segmented components rather than a single complex lens
Solution Approach 2:
The patent employs lenses with different refractive powers and materials (including glass and plastic aspherical lenses) to construct the optical system. This composite approach allows optimization of each lens element's properties to achieve overall system performance while controlling weight through material selection
4Measurement precision
If the optical lens design is made more complex to achieve high resolution, then the resolution is improved, but the volume of the optical lens increases
Solution Approach 1:
The optical lens is divided into multiple lens elements (first lens, second lens, third lens, fourth lens) with different refractive powers arranged in sequence. Each lens element contributes to specific optical functions, allowing the system to achieve high resolution and large viewing angle through the combined effect of segmented components rather than a single complex lens
Solution Approach 2:
The patent utilizes aspherical lens surfaces to introduce dimensional complexity in the shape of lens elements rather than increasing the overall volume. The aspherical design allows light rays to be focused more efficiently in three-dimensional space, achieving high resolution without proportionally increasing lens volume
5Adaptability or versatility
If the optical lens design is made more complex to achieve large viewing angle, then the viewing angle is improved, but the device complexity increases
Solution Approach 1:
The optical lens is divided into multiple lens elements (first lens, second lens, third lens, fourth lens) with different refractive powers arranged in sequence. Each lens element contributes to specific optical functions, allowing the system to achieve high resolution and large viewing angle through the combined effect of segmented components rather than a single complex lens
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 results in an optical lens that is smaller, lighter, with a larger viewing angle, and high resolution, while effectively mitigating thermal drift issues, ensuring consistent image quality across varying temperatures.
Implementation Method 1
an image beam provided by each of the above various forms of panels passes through an optical lens and enters a waveguide through a coupling entrance. Then, the image beam is transmitted to a coupling exit in the waveguide, and then the image beam is projected to a position of a human eye to form an image
Implementation Method 2
The design incorporates a sequence of lenses with specific refractive powers (positive, negative, positive, and positive) and aspherical shapes, optimized to minimize cross-sectional area convergence and maintain thermal stability
Data Source
AI summary
An optical lens and a head-mounted display device are provided. The optical lens includes a first lens, a second lens, a third lens, and a fourth lens sequentially arranged from a light exit side to a light incident side. Refractive powers of the first lens, the second lens, the third lens and the fourth lens are sequentially positive, negative, positive and positive. An image generator is disposed at the light incident side. The optical lens is configured to receive an image beam provided by the image generator. The image beam forms a stop at the light exit side. The stop has the minimum cross-sectional area of beam convergence of the image beam. The optical lens and the head-mounted display device of the disclosure have advantages of smaller size, light weight, large viewing angle and high resolution.