Six-element Camera Lens with Plastic-Glass Alternation
Solution Overview
Problem
There is a need for ultra-thin wide-angle camera lenses with good optical characteristics and fully corrected chromatic aberration, particularly for handheld devices like smartphones and digital cameras, where the shrinking pixel size of photosensitive devices and increasing demand for better imaging quality require more complex lens structures.
Innovation Solution
A six-piece camera optical lens design is proposed, with specific refractive power and curvature radius conditions for each lens element, made of different materials (plastic and glass), optimizing the focal lengths, refractive indices, and thicknesses to achieve ultra-thin and wide-angle capabilities while correcting aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a three-piece or four-piece lens structure is used, then the device complexity is reduced, but the imaging quality and chromatic aberration correction are insufficient
Solution Approach 1:
The lens system is divided into six distinct lens elements with specific refractive powers and material compositions. Each lens element (first through sixth lenses) is independently designed with specific curvature radii, thicknesses, and refractive indices to collectively achieve superior imaging quality and chromatic aberration correction that cannot be attained with fewer elements.
2Manufacturing precision
If more lens elements are added to improve imaging quality, then the chromatic aberration correction improves, but the lens thickness increases
Solution Approach 1:
The patent employs precise parameter optimization for each lens element including refractive indices (nd1=1.605, nd2=1.707, nd3=1.650, nd4=1.708, nd5=1.626, nd6=1.507), curvature radii ratios ((R1+R2)/(R1-R2) between -2.0 and -0.5, (R3+R4)/(R3-R4) between -1.5 and 0.5, (R5+R6)/(R5-R6) between 1.0 and 3.0), and thickness ratios (d1/TTL between 0.05-0.15, d2/TTL between 0.10-0.30, d3/TTL between 0.05-0.15). These parameter constraints enable compact lens thickness while achieving excellent chromatic aberration correction across the visible spectrum.
Solution Approach 2:
The lens system utilizes composite material construction with alternating plastic and glass elements. The first lens is made of plastic material, the second lens of glass material, the third lens of plastic material, the fourth lens of glass material, the fifth lens of plastic material, and the sixth lens of plastic material. This composite approach leverages the complementary optical properties of different materials to correct chromatic aberrations while maintaining compact dimensions.
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 design achieves high-performance, ultra-thin camera lenses with fully corrected on-axis and off-axis chromatic aberrations, maintaining miniaturization characteristics and improving imaging quality across various angles.
Implementation Method 1
the first lens L1 has a positive refractive power with a convex object side surface relative to the proximal axis and a concave image side surface relative to the proximal axis
Data Source
AI summary
The present disclosure discloses a camera optical lens. The camera optical lens including, in an order from an object side to an image side, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. The first lens is made of plastic material, the second lens is made of glass material, the third lens is made of plastic material, the fourth lens is made of glass material, the fifth lens is made of plastic material, and the sixth lens is made of plastic material. The camera optical lens further satisfies specific conditions.