Four-Lens Camera Module with Glued L2 and L3 for Miniaturization
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Solution Overview
Problem
Existing four-piece camera lenses have insufficient refractive power distribution and shape, leading to low sensitivity in correcting chromatic aberration and difficulty in miniaturization, resulting in ordinary optical performance and assembly challenges.
Innovation Solution
A camera lens configuration with specific plastic lenses, including a positive first lens, negative second and third lenses, and a negative fourth lens, where the second and third lenses are glued together, along with an aperture stop and a glass flat, optimized for focal lengths, refractive powers, and Abbe numbers to enhance chromatic aberration correction and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the refractive power distribution and shape of the lenses are optimized to correct chromatic aberration, then the sensitivity to correct chromatic aberration is improved, but the device complexity increases
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive power distribution (positive-negative-positive-negative sequence), adjusting the shape parameters (aspheric surfaces with inflection points and arrest points), and selecting specific Abbe numbers for each lens to enhance chromatic aberration correction sensitivity
Solution Approach 2:
The patent uses composite material principles by combining plastic lenses with different refractive indices and Abbe numbers, where each lens is made from materials specifically selected to contribute to overall chromatic aberration correction while maintaining manufacturing feasibility
2Length of moving object
If the optical length is shortened for miniaturization, then the device size is reduced, but the assembly difficulty increases
Solution Approach 1:
The patent merges the second and third lenses by gluing them together, which shortens the optical length for miniaturization while the glue layer provides a buffer that facilitates assembly, thus resolving the contradiction between compact size and assembly ease
Solution Approach 2:
The patent employs a nested structure where the aperture stop is positioned between the first and second lenses, and the glass flat is placed between the fourth lens and the image sensor, creating a compact nested arrangement that minimizes optical length while maintaining assembly feasibility
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 achieves high sensitivity, reduced optical length, lower chromatic aberration, and lower cost, with excellent optical performance, including a high angle of view and F-number less than 2.5, suitable for miniaturized electronic equipment.
Implementation Method 1
the second lens L2 and the third lens L3 are glued together
Implementation Method 2
a first lens L1 with a positive refractive power, a second lens L2 with a negative refractive power, a third lens L3 with a positive refractive power, and a fourth lens L4 with a negative refractive power
Data Source
AI summary
A camera lens is disclosed. The camera lens includes, in an order from an object side to an image side, a first lens with a positive refractive power; a second lens with a negative refractive power; a third lens with a positive refractive power; and a fourth lens with a negative refractive power. The camera lens further satisfies specific conditions.