VR Optical Module with Lamination Film for Adjustable Diopter
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Solution Overview
Problem
Existing small-sized and lightweight VR foldable optical path systems face issues such as small Eyebox, small Field of View (FOV), inability to achieve adjustable diopter, or complex adjustment structures with limited diopter adjustment range.
Innovation Solution
An optical module comprising a first lens, a second lens, and a third lens with a lamination film including a reflective polarizing film and a quarter waveplate film, optimized for a pancake-lens structure with specific focal length, Eyebox, and FOV conditions, allowing for adjustable diopter and improved imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a foldable optical path system is used to reduce size and weight, then the device becomes more compact and lightweight, but the Eyebox and FOV become smaller
Solution Approach 1:
The optical module is divided into three separate lens groups (first lens group, second lens group, third lens group) that can be independently positioned and adjusted. This segmentation allows each group to contribute differently to the overall optical path, enabling compact folding while maintaining adequate Eyebox and FOV by optimizing the contribution of each segment to the final image formation.
Solution Approach 2:
The patent implements a nested arrangement where the second lens group is positioned within the optical path between the first and third lens groups. The lenses are arranged in a compact sequence with minimal spacing, creating a nested-like structure that reduces the overall optical path length while maintaining the necessary optical functions for adequate Eyebox and FOV.
2Volume of moving object
If a foldable optical path system is used to reduce size and weight, then the device becomes more compact and lightweight, but the FOV becomes smaller
Solution Approach 1:
Each lens group is designed with specific local optical properties - the first lens group has particular curvature and refractive characteristics, the second lens group has different characteristics optimized for its position, and the third lens group has its own optimized properties. This local quality optimization allows each component to contribute maximally to expanding FOV within the constraints of the compact folded structure.
Solution Approach 2:
The patent introduces adjustable diopter capability through movable lens groups, allowing the optical system to dynamically adapt to different viewing conditions and user needs. This dynamic adjustment mechanism enables the compact optical module to maintain adequate FOV across different focusing states, effectively resolving the FOV limitation of fixed compact optical systems.
3Adaptability or versatility
If an adjustable diopter function is added, then users with different vision requirements can use the device, but the adjustment structure becomes more complex
Solution Approach 1:
The movable lens groups serve multiple functions: they enable diopter adjustment for different vision requirements, contributes to focusing control, and help optimize the compact folded optical path. This multi-functionality reduces the need for separate dedicated adjustment mechanisms, thereby limiting the increase in structural complexity while achieving adjustable diopter functionality.
4Volume of moving object
If the optical path is folded to reduce size, then the device becomes more compact, but the optical quality and imaging performance deteriorate
Solution Approach 1:
The patent replaces complex mechanical folding mechanisms with an optimized multi-lens optical design that achieves compactness through careful optical path arrangement rather than physical folding. The three lens groups are positioned to create a compact optical train that maintains excellent imaging quality through precise optical design, avoiding the quality degradation associated with mechanical folding systems.
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 optical module provides a larger Eyebox, adjustable diopter, and enhanced FOV, enabling a better immersive experience with reduced size and weight, suitable for miniaturized VR devices.
Implementation Method 1
a lamination film is attached on an image-side surface of the first lens, the lamination film comprising, from the image side to the object side, a reflective polarizing film and a quarter waveplate film
Implementation Method 2
a reflective polarizing film and a quarter waveplate film
Implementation Method 3
a lamination film is attached on an image-side surface of the first lens, the lamination film comprising, from the image side to the object side, a reflective polarizing film and a quarter waveplate film
Implementation Method 4
a first lens, a second lens and a third lens; wherein a lamination film is attached on an image-side surface of the first lens
Data Source
AI summary
The present disclosure discloses an optical module and a VR device. The optical module includes, from an image side to an object side, a first lens, a second lens and a third lens; a lamination film is attached on an image-side surface of the first lens, the lamination film comprising, from the image side to the object side, a reflective polarizing film and a quarter waveplate film; and the optical module further satisfying following conditions: 1.00≤f23/f≤1.50; MAX SD≤27.00 mm; and Eyebox≥12.00*12.00 mm. The present disclosure not only solves the existing problem of small Eyebox, small FOV, the inability to achieve adjustable diopter, or the ability to achieve adjustable diopter but an adjustment structure being complex and a range of diopter adjustment being small, but also satisfies a use requirement for miniaturization and light weight of an optical module in a VR device.