Two-Lens Imaging Lens Aberration Correction and Compact Design
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Solution Overview
Problem
Existing imaging lenses for mobile terminal devices face challenges in achieving good aberration performance while maintaining a compact size and low cost, particularly in responding to higher pixel densities and mass production requirements.
Innovation Solution
The design incorporates a two-lens constitution with specific focal length and power distributions, including a first lens block with a convex object side and concave image side surface, and a second lens block with a positive peripheral power, along with an aperture stop and a resin-based lens base plate for improved heat resistance and handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a three plastic lens structure is used, then mass production capability is improved, but the optical overall length cannot be sufficiently shortened
Solution Approach 1:
The lens system is divided into two distinct lens blocks: a first lens block with positive power and a second lens block with negative power. This segmentation allows each block to be optimized independently for both mass production compatibility and compact optical length, resolving the contradiction between productivity and size reduction.
Solution Approach 2:
The patent applies specific conditional expressions to control the focal lengths and powers of the lens blocks. By precisely adjusting parameters such as the ratio of focal lengths (fla/fb) and the power distribution, the system achieves compact optical overall length while maintaining mass production feasibility through standardized lens block designs.
2Length of stationary object
If the power of the object side lens section is increased, then the optical overall length is shortened, but aberration correcting ability becomes insufficient
Solution Approach 1:
Different lens blocks are assigned different power characteristics tailored to their specific functions. The first lens block has positive power optimized for compactness, while the second lens block has negative power optimized for aberration correction. This local optimization of quality attributes resolves the contradiction between length reduction and aberration correction.
Solution Approach 2:
The system uses composite lens structures combining positive and negative power lens blocks with different material properties. This composite approach allows the first lens block to focus light for compactness while the second lens block corrects aberrations, achieving both short optical length and high imaging precision.
3Ease of manufacture
If a resin lens is used, then cost is reduced and workability is improved, but heat resistance for reflow process becomes insufficient
Solution Approach 1:
The lens blocks are constructed using composite material structures that combine resin materials with enhanced heat resistance properties. This allows the lenses to maintain their manufacturing advantages (cost-effectiveness and workability) while achieving the thermal stability required for reflow processes in mass production.
Solution Approach 2:
The patent specifies conditional expressions for the lens parameters that are optimized for both manufacturing ease and thermal durability. By controlling the focal length ratios and power distributions within specific ranges, the lens design achieves heat resistance suitable for reflow processes while maintaining the cost and workability benefits of resin 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
This configuration enhances aberration correction, reduces the optical system's size, and enables cost-effective mass production of high-performance imaging lenses for mobile devices.
Implementation Method 1
a lens section which is formed on at least one of an object side surface and an image side surface of the lens base plate and has a positive or negative power
Data Source
AI summary
Imaging lens comprises, in order from the object side, a first lens block having a convex and concave surfaces oriented toward the object and image side respectively, and having a positive power, and a second lens. An aperture stop can be located on the object side of the first lens block, a peripheral portion of the image side surface of the second lens has a positive power where: 0.62<fla/f<0.82 (1) −4.00<flb/f<−1.11 (2) 0.70<D4/f<1.00 (3) with, fla: focal distance of object side lens portion of the first lens block; flb: focal distance of an image side lens portion of the first lens block; D4: distance on the optical axis from the object side surface of the first lens block to the image side surface of the second lens; f: focal distance of the imaging lens total system.