Single-Lens Camera Module for Biometric Identification
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Solution Overview
Problem
Existing camera lenses with wide angles over 90° and high luminous flux are either economically inefficient due to multiple lens components or have narrow viewing ranges, making them unsuitable for biological feature certification and eye tracking identification.
Innovation Solution
A single-piece camera lens with a positive refractive power and aspheric shape, optimized by specific curvature radius and focal distance ratios, to achieve wide angles while minimizing aberrations and size, suitable for biological feature certification within the 750 nm to 900 nm wavelength range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two-lens system is used to achieve wide angle and high luminous flux, then optical performance is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent merges two separate lens components into a single integrated lens structure. The first lens portion (with negative refractive power) and the second lens portion (with positive refractive power) are combined into one piece, eliminating the need for separate lens assemblies while maintaining the optical performance benefits of the two-lens system.
Solution Approach 2:
The single lens is segmented into two functional portions: a first lens portion extending from the object-side surface to an inflection point, and a second lens portion from the inflection point to the image-side surface. This segmentation allows each portion to contribute differently to the optical performance, with the first portion providing negative refractive power and the second portion providing positive refractive power.
2Ease of manufacture
If a single plastic lens is used to reduce cost, then manufacturing cost is reduced, but viewing angle is limited to narrow angles
Solution Approach 1:
The patent changes the refractive power distribution parameters within the single lens structure. By configuring the first lens portion with negative refractive power and the second lens portion with positive refractive power, the lens achieves wide-angle performance (90° to 110°) that would normally require multiple lenses, while maintaining single-lens manufacturing simplicity.
3Device complexity
If a single lens with F value of 2.8 to 3.2 is used to simplify structure, then device complexity is reduced, but luminous flux is insufficient for identification applications
Solution Approach 1:
The patent optimizes the F value parameter to be 2.40 or less, which is a significant improvement over conventional single-lens structures (F=2.8 to 3.2). This parameter change, achieved through the specific refractive power distribution and curvature radius ratios, enables sufficient luminous flux for identification applications while maintaining the simplicity of a single-lens structure.
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 solution enables a compact, high-performance camera lens with excellent optical properties, wide angles, and effective aberration correction, suitable for vein certification and eye tracking identification, while maintaining economic viability.
Implementation Method 1
A glass plate GF is arranged between the first lens L1 and the imaging surface side
Implementation Method 2
a first lens L1 with a positive refractive power and an aspheric shape
Data Source
AI summary
A camera lens includes an open aperture; and a falcate first lens having a positive refractive power with a convex surface toward an imaging surface side. The camera lens satisfies specific conditions.