Short-Range Optical Magnification Module for Compact VR
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Solution Overview
Problem
Current short-range optical amplification modules are too large and bulky to meet the compact and ultrathin structure requirements for intelligent Virtual Reality (VR) devices, which also need to provide a wide field angle, large eyebox, and high-quality imaging.
Innovation Solution
A short-range optical amplification module is designed with specific focal length conditions for its lenses and optical surfaces, including a reflective polarizing plate, phase delay plates, and lenses, to achieve a compact form while maintaining high amplification and imaging quality, with focal lengths and optical powers optimized to balance aberration and reduce thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple optical devices are used to meet imaging quality requirements, then imaging quality is improved, but module size and volume increase
Solution Approach 1:
The patent combines multiple optical functions into fewer optical elements. Specifically, the optical system integrates magnification, reflection, and polarization functions into a compact arrangement with only 2-3 main optical elements (magnifying lens, reflective polarizing plate, and phase delay plates), eliminating the need for separate components for each function while maintaining high imaging quality
Solution Approach 2:
The patent employs a nested arrangement where the optical path is folded back on itself. The light path enters the magnifying lens, reflects off the reflective polarizing plate, passes through the lens again, and exits through the same or adjacent optical elements. This nested optical path allows multiple optical actions to occur within a compact volume, effectively nesting the optical functions within each other
2Manufacturing precision
If multiple optical devices are used to meet imaging quality requirements, then imaging quality is improved, but device thickness increases
Solution Approach 1:
The patent transitions from a linear sequential arrangement of optical elements to a folded optical path that utilizes lateral space more efficiently. By introducing the reflective polarizing plate at an angle, the optical path is bent into a compact configuration that reduces the axial thickness while maintaining the required optical path length for high-quality imaging
3Adaptability or versatility
If optical elements are added to increase field angle and eyebox, then user experience is improved, but device complexity increases
Solution Approach 1:
The patent optimizes the parameters of existing optical elements to achieve wider field angle and larger eyebox without adding complexity. The magnifying lens is designed with specific focal length ratios (f2/f1 between 0.5-2.0) and the reflective polarizing plate is positioned at optimized distances (0.5f3-L1 and L2-2f3) to maximize field of view and eyebox size while maintaining system simplicity
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 module achieves a small overall thickness while providing a large optical amplification effect, enabling a wide field angle, large eyebox, and high-quality imaging, suitable for small-size VR devices, enhancing user experience.
Implementation Method 1
a reflective polarizing plate
Implementation Method 2
a reflective polarizing plate
Implementation Method 3
a first phase delay plate, a second phase delay plate
Implementation Method 4
a magnifying lens comprising a first lens and a second lens
Implementation Method 5
the first focal length f3 of the third lens meets the following condition: 1F≤f3≤2F
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
The present invention discloses a short-range optical amplification module, which includes, sequentially from the image side to the object side, a reflective polarizing plate, a first phase delay plate, a third lens and a second phase delay plate, wherein the short-range optical amplification module further includes a first lens and/or a second lens that are/is located on either side of any one of the reflective polarizing plate, the first phase delay plate, the third lens and the second phase delay plate. In the third lens, the optical surface adjacent to the second phase delay plate is a transflective optical surface; the reflection surface-containing focal length f3 of the third lens meets the following condition: 1F≤f3≤2F, wherein F is the focal length of the short-range optical amplification module. By performing parameter refining on the f3 that influences the optical amplification effect, the module can keep a small overall thickness while obtaining a large optical amplification effect and it can be applied in a small-size VR device, so that the VR device can realize a wide field angle, a large eyebox and high-quality imaging effect, and hence a better user experience.