Wafer-Scale Image Pickup Lens Aberration Correction
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Solution Overview
Problem
Current image pickup lenses for mobile terminals face challenges in achieving high quality, low cost, and mass productivity while maintaining compactness and correcting aberrations, particularly chromatic aberration, due to limitations in manufacturing complexity and material compatibility.
Innovation Solution
The design of an image pickup lens comprising a first lens block with positive power and a second lens block, where the first lens block has a convex surface facing the object side and the second lens block has a concave surface, with specific refractive index and Abbe number relationships to control the total optical length and correct aberrations, allowing for easy dimension management and high performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a wafer-scale lens method is used to achieve mass productivity and cost reduction, then manufacturing efficiency and productivity are improved, but aberration correction capability deteriorates
Solution Approach 1:
The lens is divided into multiple lens blocks (first lens block with positive power, second lens block with negative power) formed on the same wafer substrate. This segmentation allows each lens block to correct specific types of aberrations while maintaining the mass productivity benefits of wafer-scale manufacturing. The first lens block corrects spherical aberration and the second lens block corrects chromatic aberration, achieving comprehensive aberration correction through divided functional units.
Solution Approach 2:
The invention uses composite lens structures where different lens blocks are formed with different resin materials having specific refractive indexes and Abbe numbers. The first lens block uses resin with refractive index 1.4-1.7 and Abbe number 20-50, while the second lens block uses resin with refractive index 1.5-1.8 and Abbe number 25-55. This composite material approach enables simultaneous correction of multiple aberration types while maintaining compatibility with wafer-scale manufacturing processes.
2Length of moving object
If the total length of the image pickup lens is shortened to achieve compactness, then the size is reduced, but aberration correction capability deteriorates
Solution Approach 1:
Multiple lens blocks are nested within a compact configuration where the first lens block (positive power) and second lens block (negative power) are positioned closely together along the optical axis. This nested arrangement allows comprehensive aberration correction functionality to be packed into a short total length, achieving both compactness and high aberration correction capability.
Solution Approach 2:
The invention optimizes specific parameter ranges including the focal length ratio (0.3 < f1/f < 0.8), refractive indexes (n1: 1.4-1.7, n2: 1.5-1.8), and Abbe numbers (v1: 20-50, v2: 25-55) to achieve aberration correction in a compact form. By carefully controlling these parameters, the lens achieves excellent optical performance despite the shortened total length.
3Ease of manufacture
If resin lenses are used to reduce cost and improve workability, then manufacturing cost and ease of manufacture are improved, but heat resistance deteriorates
Solution Approach 1:
The invention specifies resin materials with refractive indexes of 1.4-1.7 and 1.5-1.8, and Abbe numbers of 20-50 and 25-55 for the two lens blocks. These parameter ranges select resins that balance good workability for molding with adequate heat resistance to withstand reflow processing temperatures, achieving both ease of manufacture and temperature tolerance.
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 results in a compact, high-quality image pickup lens with improved aberration correction and reduced manufacturing complexity, enabling mass production while maintaining low cost and high performance.
Implementation Method 1
a lens portion 1a with a positive power, formed on the object side surface of the first lens substrate; and a lens portion 1b with a negative power, formed on the image side surface of the first lens substrate
Implementation Method 2
an image pickup lens in JP-A No. 2006-323365 in which a diffractive surface is applied on a lens substrate
Data Source
AI summary
An image pickup lens includes: a first lens block with a positive power and a second lens block. The first lens block includes a first lens substrate, a lens portion 1a with a positive power, formed on an object-side surface of the first lens substrate, and a lens portion 1b with a negative power, formed on an image-side surface of the first lens substrate. The object-side surface of the lens portion 1a is a convex surface, and an image-side surface of the lens portion 1b is a concave surface. The second lens block includes a second lens substrate, and a lens portion 2a with a negative power, formed on an object-side surface of the second lens substrate. The object-side surface of the lens portion 2a is a concave surface. The image pickup lens satisfies the predetermined conditional expressions.