Optical Lens Assembly with Semi-Transparent Mirror for AR Displays
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Solution Overview
Problem
The challenge lies in creating a compact and easily manufacturable optical lens assembly for head-mounted electronic apparatuses that can effectively combine virtual and real images without distortion, while minimizing the number of lenses to achieve miniaturization and ease of manufacturing.
Innovation Solution
The optical lens assembly incorporates a combination of negative and positive lenses, along with a flat semi-transparent mirror, where the lenses are rotationally symmetric and aspherical, and the mirror is positioned to reflect image light while transmitting external real light, allowing for aberration correction and easy alignment, enabling a compact and lightweight design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple lenses are used to obtain good image quality, then image quality is improved, but device size and manufacturing complexity increase
Solution Approach 1:
The patent merges multiple lens functions into a single negative lens by integrating the optical powers and aberration correction capabilities of both negative and positive lenses. This consolidation reduces the total number of lens elements from multiple separate lenses to one integrated lens, thereby simplifying the optical system while maintaining good image quality
Solution Approach 2:
The negative lens is designed to perform multiple functions simultaneously: it provides the necessary negative optical power, corrects chromatic aberrations, and compensates for other optical distortions. This multi-functional design eliminates the need for separate positive lenses, reducing system complexity while achieving comprehensive aberration correction
2Volume of moving object
If miniaturization is pursued to wear like glasses, then device size is reduced, but manufacturing difficulty increases
Solution Approach 1:
By combining multiple lens elements into a single negative lens, the patent reduces the total number of components that need to be manufactured and assembled. This consolidation simplifies the manufacturing process, particularly for miniaturized optical systems where precise alignment and assembly of multiple small lenses would be extremely difficult
Solution Approach 2:
The patent employs aspherical surfaces and specific refractive index selections to achieve the required optical performance in a compact form factor. These parameter changes allow the single negative lens to provide the necessary optical power and aberration correction without requiring a larger system, thus enabling miniaturization while maintaining manufacturability
3Volume of moving object
If a flat semi-transparent mirror is used to combine virtual and real images, then device compactness is improved, but optical path management becomes more challenging
Solution Approach 1:
The flat semi-transparent mirror acts as an intermediary element that combines the virtual image from the display with the real image from the external environment. By positioning this mirror at the exit side of the negative lens, the patent creates a simplified optical path where light from both sources can be effectively combined and directed to the user's eye, managing the complexity through strategic element placement
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
This configuration allows for a compact, lightweight, and cost-effective optical lens assembly that effectively combines virtual and real images without distortion, facilitating the miniaturization of head-mounted displays and reducing manufacturing complexity.
Implementation Method 1
a flat semi-transparent mirror reflecting image light generated from the display and transmitting external real image light
Implementation Method 2
at least one negative lens and at least one positive lens arranged along an optical axis of the image
Data Source
AI summary
Provided is an optical lens assembly and an electronic apparatus having the optical lens assembly.In the optical lens assembly for an electronic apparatus, which is worn by a user to see an image generated from a display, the optical lens assembly includes at least one negative lens and at least one positive lens arranged along an optical axis of the image, and a flat semi-transparent mirror reflecting image light generated from the display and transmitting external real image light, in which each of the at least one negative lens and the at least one positive lens is a rotationally symmetric lens with respect to the optical axis.