Short-Range Optical Magnification Module for VR
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Solution Overview
Problem
Existing optical amplification modules in VR systems lack an optimized design, failing to provide a wide field angle, large eyebox, and high-quality imaging effect, which are essential for a good user experience.
Innovation Solution
The design of a short-range optical amplification module with specific focal length conditions for lenses and a transflective optical surface, along with a compact ultrathin structure, ensures a wide field angle, large eyebox, and high-quality imaging by optimizing the first and second lens focal lengths and the effective focal length of the reflection surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lens assembly structure is optimized to achieve wide field angle and large eyebox, then the user experience is improved, but the device complexity increases
Solution Approach 1:
The optical amplification module is divided into distinct functional components: a first lens with positive optical power, a second lens with negative optical power, a reflective polarizing plate, and phase delay plates. This segmentation allows each component to be optimized independently for specific functions (wide field angle, eyebox size, polarization control) while reducing the overall complexity of the lens assembly structure.
Solution Approach 2:
The patent introduces a reflective polarizing plate to create a folded optical path, effectively adding a dimensional aspect to the optical design. This allows the optical system to achieve wide field angle and large eyebox without proportionally increasing the physical size of the lens assembly, thereby improving adaptability while controlling device complexity.
2Reliability
If the lens assembly is optimized for high-quality imaging effect, then the imaging quality is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameter ranges for the lenses: the first lens has positive optical power with focal length in a specific range, and the second lens has negative optical power with focal length in a specific range. By defining these parameter ranges, the patent achieves high-quality imaging while providing manufacturing flexibility, as long as the parameters fall within the specified ranges.
Solution Approach 2:
Different regions of the optical system are assigned different quality requirements. The first lens (positive power) and second lens (negative power) have different focal length specifications tailored to their specific functions in the optical path. This localized optimization allows high imaging quality without requiring uniform high precision across all components.
3Length of moving object
If the optical amplification module is designed with compact ultrathin structure, then the device thickness is reduced, but the volume of optical components is constrained
Solution Approach 1:
The optical components are arranged in a compact nested configuration where the first lens, second lens, reflective polarizing plate, and phase delay plates are positioned in sequence along a folded optical path. This nesting allows the optical system to achieve compact ultrathin structure while accommodating all necessary optical components within the constrained volume.
Solution Approach 2:
The reflective polarizing plate creates a folded optical path that effectively utilizes three-dimensional space. By folding the optical path rather than using a linear arrangement, the patent achieves compact thickness while providing sufficient optical path length and component spacing, resolving the contradiction between thin profile and component volume requirements.
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 optimized module achieves a system focal length of 15-35mm, a field angle of 90-100°, and supports screen resolutions up to 4000*4000, while maintaining a compact thickness of 11-28mm and eye relief of 5-10mm, enhancing user experience in VR devices.
Implementation Method 1
a reflective polarizing plate 01
Implementation Method 2
reflective polarizing plate 01
Implementation Method 3
first phase delay plate 02, a second phase delay plate 04
Implementation Method 4
lens unit 03... lens assembly
Implementation Method 5
lens assembly, which is the core part that influences the amplification effect on the optical image
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention discloses a short-range optical amplification module, spectacles, a helmet and a VR system. The amplification module includes a reflective polarizing plate, a first phase delay plate, a second lens and a second phase delay plate that are arranged in turn, and a first lens is further set on either side of any one of the reflective polarizing plate, the first phase delay plate, the second lens and the second phase delay plate. In the second lens, the optical surface adjacent to the second phase delay plate is a transflective optical surface. The first focal length f2 of the second lens meets the condition: 1F≤f2≤2F, wherein F is the system focal length of the optical amplification module. By performing parameter refining on the first focal length f2 that influences the optical amplification effect, the module can keep a small overall thickness while obtaining a large optical amplification effect, and the VR device can realize a good field angle, a large oculomotor range and a high-quality imaging effect, and hence a better user experience.