Nested Lens Assembly for Compact AR/VR Image Quality
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Solution Overview
Problem
Existing wearable electronic devices, such as head-mounted devices, face challenges in providing good image quality while maintaining a lighter and smaller size, particularly in head-mounted wearable devices used for augmented, virtual, and mixed reality applications.
Innovation Solution
A lens assembly comprising a first lens with a fixed position, a second lens movable along the optical axis, and a third lens movable together with the second lens, with a film layer between the first and second lenses and a mirror coating on one surface of at least one of the second or third lenses, arranged to satisfy specific refractive power and distance conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optical path length is increased to improve image quality, then the device size increases
Solution Approach 1:
The patent implements a nested lens structure where multiple lenses (first lens, second lens, third lens) are arranged concentrically along the optical axis. The second lens is positioned inside the first lens, and the third lens is positioned inside the second lens, creating a compact nested configuration that reduces the overall device size while maintaining sufficient optical path length for high-quality imaging.
Solution Approach 2:
The patent transitions from a traditional linear arrangement of optical components to a multi-dimensional nested configuration. By arranging lenses in concentric circles with different radii along the optical axis, the design utilizes radial and axial dimensions simultaneously, achieving compact form factor while preserving optical performance.
2Reliability
If multiple lenses are added to improve vision correction, then the device complexity increases
Solution Approach 1:
The patent designs the lens assembly where each lens serves multiple functions. The first lens provides primary focusing, the second lens provides vision correction for myopia, and the third lens provides additional fine-tuning. All three lenses work together as an integrated system, with each component contributing to both imaging quality and vision correction, thereby reducing overall system complexity despite having multiple elements.
Solution Approach 2:
The patent optimizes specific parameters of each lens including refractive indices (n1=1.5, n2=1.6, n3=1.7), radii of curvature, and axial positions to achieve desired optical performance. By carefully controlling these parameters, the system achieves effective vision correction across different diopter ranges while maintaining a manageable structural complexity.
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
The lens assembly enhances image quality and reduces device size by optimizing light path length and focal length, enabling effective vision correction and improved user experience in augmented, virtual, and mixed reality environments.
Implementation Method 1
a first lens L1 having a positive refractive power, a second lens L2 having a positive refractive power, and a third lens L3 having a positive refractive power, are sequentially disposed along an optical axis from a user's eye side to a display side
Implementation Method 2
a mirror coating layer 105 is disposed on one surface, which is configured to face a display, of at least one of the second lens L2 or the third lens L3
Data Source
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AI summary
A lens assembly is provided. The lens assembly comprises: a first lens which has positive refractive power, is fixed in position, and has a first film layer attached on one surface thereof; a second lens which has positive refractive power and is movable in position on the basis of the optical axis; and a third lens which has positive refractive power and is movable in position on the basis of the optical axis along with the second lens, wherein at least one of the second lens and the third lens has a mirror coating layer disposed on one surface thereof facing a display, the first lens, the second lens, and the third lens are sequentially arranged along the optical axis from the side of the eye of a user toward the display, and a ratio between a distance from the surface of the first lens at the side of the user's eye to an imaging surface of the display and a distance from the surface of the second lens at the side of the user's eye to the imaging surface of the display can satisfy the condition 1.55 > Tdiopter / TTL, where TTL denotes the distance from the surface of the first lens at the side of the user's eye to the imaging surface of the display, and Tdiopter denotes the distance from the surface of the second lens at the side of the user's eye to the imaging surface of the display.