Imaging Lens With Biconvex Air Lenses for Compact Semi-Wide-Angle Cameras
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Solution Overview
Problem
Existing imaging lenses for digital cameras, particularly those suitable for film cameras, face challenges in achieving high performance, compact size, and semi-wide-angle capabilities, with issues such as large lens total length and thickness.
Innovation Solution
An imaging lens configuration comprising a first lens group with a positive lens closest to the object, an aperture stop, and a second lens group with positive power, utilizing two negative biconvex air lenses, arranged to optimize power distribution and reduce size while correcting aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a substantially symmetrical type or telephoto type lens is used for semi-wide angle, then the lens size can be decreased, but the imaging performance is insufficient for digital cameras
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive powers, focal lengths, and spacing of lens groups to achieve both compact size and high imaging performance. The specific parameter ranges for focal lengths (f1, f2, f3) and refractive powers (1/f1, 1/f2, 1/f3) are optimized to balance size reduction with aberration correction capability for digital camera sensors
Solution Approach 2:
The patent uses composite lens structures combining multiple lens groups with different optical properties (positive and negative refractive powers). The first lens group (I) with positive power, aperture stop (S), and second lens group (II) with positive power create a composite system that achieves both compact form factor and corrected aberrations suitable for digital imaging
2Volume of moving object
If existing imaging lens designs are adapted for digital cameras, then the lens can be made compact, but the aberration correction is insufficient for large image sensors
Solution Approach 1:
The patent segments the lens into distinct functional groups: first lens group (I) with positive power containing specific lenses, aperture stop (S), and second lens group (II) with positive power. This segmentation allows each group to be optimized for specific functions while maintaining overall compact size and achieving proper aberration correction for digital sensors
Solution Approach 2:
The patent applies local quality by assigning different optical characteristics to different regions of the lens system. The first lens group has specific refractive power characteristics, the aperture stop controls light angles, and the second lens group has different power characteristics, with each region optimized for its local function while contributing to overall aberration correction
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 results in a high-performance, compact, and semi-wide-angle imaging lens suitable for digital cameras, achieving reduced size and improved aberration correction.
Implementation Method 1
a first lens group having positive power, the first lens group including a positive lens closest to an object within the first lens group; an aperture stop; and a second lens group having positive power
Implementation Method 2
Only two negative air lenses of a first biconvex air lens and a second biconvex air lens are provided within the imaging lens
Data Source
AI summary
An imaging lens consists of: a first lens group having positive power, the first lens group including a positive lens closest to an object within the first lens group; an aperture stop; and a second lens group having positive power. The first lens group, the aperture stop, and the second lens group are disposed in that order from an object side toward an image side. Only two negative air lenses of a first biconvex air lens and a second biconvex air lens are provided within the imaging lens. The first lens group includes the first biconvex air lens, and the second lens group includes a second biconvex air lens.