Single Lens Image Pickup Module Peripheral Resolution
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Solution Overview
Problem
Image pickup lenses in portable terminals face challenges in achieving a wide angle of view and high resolution at the periphery of the formed image due to an extremely short distance between the single lens and the image surface, leading to blurred images despite satisfying previous formulas for increasing resolving power.
Innovation Solution
The image pickup lens is designed with a meniscus lens having a concave surface facing the object, satisfying specific thickness and focal length ratios to increase the clearance between the single lens and the image surface, allowing for better convergence of light from the object's periphery and achieving a wide angle of view, thus enhancing the resolution at the image's periphery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the distance between the single lens and the image surface is reduced to minimize lens size, then the size and height of the image pickup lens are reduced, but the resolution at the periphery of the formed image deteriorates due to inability to converge light properly
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness of the lateral side of the single lens (d1') relative to the center thickness (d1) within the range 0.45 ≤ d1'/d1 < 0.55, and positioning the image surface at a specific distance (0.05mm ≤ d2 ≤ 0.15mm) from the lens center. These parameter optimizations enable proper light convergence at the image periphery while maintaining compact lens dimensions.
2Adaptability or versatility
If the single lens is made sufficiently thin at the lateral side to achieve wide angle of view, then the angle of view is increased, but the light convergence capability at the image periphery is compromised
Solution Approach 1:
The patent resolves this contradiction by optimizing the lateral side thickness ratio (d1'/d1) to be within 0.45-0.55, which is sufficiently thin to achieve wide angle of view (0.6 ≤ Y'/fl) while maintaining adequate light convergence capability. This specific parameter range balances both requirements that were previously conflicting.
3Length of stationary object
If the image pickup lens is designed with extremely short distance between lens and image surface to reduce height, then the height is reduced, but the resolving power at the edge of formed image cannot be achieved
Solution Approach 1:
The patent achieves both compact height and high resolving power by setting the distance from the lens center to the image surface (d2) within the specific range of 0.05mm to 0.15mm. This optimized parameter enables proper focal convergence at the image periphery while maintaining the lens at a reduced height suitable for portable terminals.
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 design effectively increases the resolution of the image's periphery by ensuring the light from the object's edge is converged to a desired point on the image surface, resulting in a higher resolution and wider angle of view, while also allowing for easier manufacturing and reduced size and height of the lens.
Implementation Method 1
the single lens being a meniscus lens having a concave surface facing the object... light from the edge of an object and its surrounding... converge, to a desired point on the image surface by the single lens
Data Source
AI summary
In order that an image pickup lens, an image pickup module, a method for manufacturing an image pickup lens, and a method for manufacturing an image pickup module may be realized each of which makes it possible to realize a higher resolution of a periphery of a formed image, an image pickup lens of the present invention satisfies the following formulas (1) and (2):0.080<d1/d2<0.22 (1);andd1′/d1<1.00 (2)where: d1 is a center thickness of the single lens; d1′ is a thickness of a lateral side of the single lens; and d2 is a length in air between the image surface and a center of that surface of the single lens which faces the image surface.