Wide-Angle Camera Lens Diopter Adjustment
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Solution Overview
Problem
Conventional wide-angle cameras for head-mounted devices are heavy and unsuitable for users with nearsightedness or farsightedness, as they require multiple lenses for aberration correction and are not comfortable to wear without glasses, which complicates image clarity.
Innovation Solution
A wide-angle camera design featuring a biconvex plus lens and a biconcave minus lens arranged in parallel, where the biconcave minus lens can move to adjust the focal power, allowing the camera to accommodate users with 500 degrees of nearsightedness to farsightedness, with aspheric surfaces and plastic materials for weight reduction and improved imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional eyepiece system uses multiple lenses to correct aberration, then imaging quality is improved, but weight increases
Solution Approach 1:
The optical system is divided into two functional segments: a stationary biconvex plus lens for primary focusing and a movable biconcave minus lens for aberration correction and diopter adjustment. This segmentation allows each lens to be optimized for its specific function, reducing the total number of lenses needed while maintaining imaging quality.
Solution Approach 2:
The biconcave minus lens serves multiple functions simultaneously: it corrects field curvature, adjusts for different diopter requirements (nearsightedness and farsightedness), and compensates for chromatic differences. This multi-functionality eliminates the need for separate correction lenses, reducing overall system weight.
2Device complexity
If fully-fixed head-mounted system is used, then device simplicity is improved, but adaptability to different vision requirements deteriorates
Solution Approach 1:
The biconcave minus lens is designed to move along the optical axis to adjust the distance between lenses, enabling dynamic adaptation to different diopter requirements. This dynamic adjustment mechanism allows the fixed-structure device to accommodate users with nearsightedness, farsightedness, and normal vision without requiring complex interchangeable lens systems.
3Ease of manufacture
If conventional lenses are used, then manufacturing simplicity is improved, but chromatic difference and field curvature correction deteriorates
Solution Approach 1:
The optical system uses composite lens design combining biconvex plus lens and biconcave minus lens with specific refractive index ranges. This composite approach leverages the complementary optical properties of different lens types to correct chromatic differences and field curvature while maintaining ease of manufacturing with conventional plastic or glass materials.
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 design effectively corrects chromatic differences and field curvature, enabling clear imaging for users with varying eyesight without changing the eye-screen distance, resulting in a lightweight and comfortable head-mounted device with enhanced imaging quality.
Implementation Method 1
A wide-angle camera for a head-mounted device, comprising a casing, a biconvex plus lens, and a biconcave minus lens
Implementation Method 2
lens surfaces of the biconvex plus lens and the biconcave minus lens are both aspheric surfaces
Data Source
AI summary
A wide-angle camera for a head-mounted device, includes, but is not limited to, a casing, a biconvex plus lens, and a biconcave minus lens. The biconvex plus lens and the biconcave minus lens are arranged in parallel in the casing and the biconcave minus lens is closer to an object space. The bioconcave minus lens is able to move along an axis of the casing to adjust a distance to the bioconvex plus lens. The focal power of a zooming system of the wide-angle camera is set to be a range from −0.005 to 0.005, an thus the bioconvex plus lens is stationary in the camera, and a movement of the bioconcave minus lens enables the camera to be suitable for the crowds of 500 degree nearsightedness to 500 degree farsightedness.