Five-Lens Optical System with Glass-Plastic Composite for Thermal Drift Reduction
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Solution Overview
Problem
Existing display devices face challenges in achieving high-resolution, lightweight, and low thermal drift optical lenses, which are crucial for advanced multimedia applications like stereoscopic displays and virtual reality.
Innovation Solution
The design of an optical lens comprising multiple lenses with specific refracting powers and materials, including glass and plastic aspheric lenses, that satisfy the condition 0.5EFL < EFL_G < 2EFL, where EFL is the effective focal length, and EFL_G is the effective focal length of all glass lenses, to minimize thermal drift and maximize spatial resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If an optical lens is designed to be lightweight and thin, then the weight and size are reduced, but the structural stability and thermal resistance deteriorate
Solution Approach 1:
The patent employs a composite lens structure combining glass and plastic materials. Specifically, at least one lens element is made of glass while others may be plastic, creating a composite optical system that leverages the thermal stability of glass and the lightweight properties of plastic to resolve the contradiction between weight reduction and structural stability
Solution Approach 2:
The optical lens is divided into multiple lens elements (first lens, second lens, third lens, fourth lens, and fifth lens) with different materials and refracting powers. This segmentation allows each element to be optimized for specific functions, with glass elements providing thermal stability and plastic elements reducing overall weight
2Stability of the object's composition
If the optical lens uses glass material, then the thermal drift is reduced, but the weight increases
Solution Approach 1:
The patent applies glass material selectively to specific lens elements where thermal stability is most critical, while using plastic materials for other elements where weight reduction is prioritized. This local quality differentiation resolves the contradiction by optimizing material distribution rather than uniform material selection
Solution Approach 2:
The mixed glass-plastic construction creates a composite optical system where glass components provide localized thermal stability while plastic components contribute to overall weight reduction, achieving a balance between thermal drift reduction and weight management
3Measurement precision
If the optical lens achieves high spatial resolution, then the image quality is improved, but the device complexity increases
Solution Approach 1:
The high spatial resolution of 116 lp/mm is achieved by segmenting the optical system into five distinct lens elements with specific refracting powers and material compositions. Each element contributes to the overall resolution while the segmented structure allows for optimized light path control without requiring a single overly 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
The optical lens achieves high spatial resolution of 116 lp/mm and reduced thermal drift, enhancing the optical performance and usability in display devices.
Implementation Method 1
an optical lens includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens with refracting power in order from a light incidence side to a light-emitting side along an optical axis
Data Source
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AI summary
The invention provides an optical lens including a first lens, a second lens, a third lens, a fourth lens, and a fifth lens with refracting power in order from a light incidence side to a light-emitting side along an optical axis, and at least one glass lens is included. The first lens has a positive refracting power, the second lens has a positive refracting power, and the third lens has a negative refracting power. The optical lens satisfies a condition of 0.5EFL < EFLG < 2EFL, where EFL is an effective focal length of the optical lens, and EFLG is an effective focal length of the at least one glass lens. The optical lens is adapted for receiving an image beam from the light incidence side, and the image beam forms a stop on the light-emitting side after passing through the optical lens. A display device is also proposed.