Eight-Lens Camera Optical Lens for Wide Angle and Ultra-Thinness
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Solution Overview
Problem
Camera optical lenses for handheld devices and imaging devices face challenges in achieving a balance of large aperture, wide angle, and ultra-thinness while maintaining good optical functions, particularly with the increasing demands for higher pixel density and smaller photosensitive devices.
Innovation Solution
A camera optical lens configuration comprising eight lenses, with specific refractive power and curvature radius conditions, including positive and negative refractive powers, and optimized focal lengths and thicknesses, to achieve a design that satisfies the requirements of large aperture, wide angle, and ultra-thinness, while correcting aberrations and ensuring high imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a traditional four-piece, five-piece or six-piece lens structure is adopted, then the lens structure is simple, but the imaging quality is insufficient for high-pixel photosensitive devices
Solution Approach 1:
The lens system is divided into eight separate lens elements with alternating positive and negative refractive powers. Each lens element is independently designed to correct specific aberrations, allowing for high imaging quality suitable for 12-megapixel and above photosensitive devices while maintaining a manageable structural complexity through systematic arrangement.
2Manufacturing precision
If the lens structure is optimized for good optical functions, then the imaging quality is improved, but the lens cannot satisfy large aperture, ultra-thinness and wide angle requirements
Solution Approach 1:
The patent establishes specific parameter ranges for focal lengths (f1/f, f4/f, f5/f ratios), curvature radii (R11, R12, R13, R14), and thicknesses (d1, d3, d5, d7, d9, d11, d13, d15) to simultaneously achieve large aperture (F/1.8 or larger), wide angle (75 degrees or more), and ultra-thinness (TTL less than 3.0mm). These parameter optimizations allow the lens to satisfy multiple design requirements while maintaining excellent optical correction.
3Length of stationary object
If the lens elements are made thinner to achieve ultra-thinness, then the total optical length is reduced, but the aberration correction capability is compromised
Solution Approach 1:
The patent uses alternating positive and negative refractive power lens elements to counterbalance each other's aberrations. The negative lenses compensate for spherical and chromatic aberrations introduced by positive lenses, enabling effective aberration correction despite the reduced thickness of individual elements and the compact overall structure.
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 lens configuration effectively addresses the design requirements of large aperture, wide angle, and ultra-thinness, providing excellent optical performance and suitability for high-pixel CCD and CMOS camera elements, such as those found in web cameras and mobile phone lenses, with improved imaging quality and reduced aberrations.
Implementation Method 1
a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a negative refractive power; a fifth lens having a positive refractive power; a sixth lens having a negative refractive power; a seventh lens having a positive refractive power; and a eighth lens having a negative refractive power
Data Source
AI summary
The present invention provides a camera optical lens including, from an object side to an image side, a first lens, a second lens, a third lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and a eighth lens. The first, third, fifth and seventh lens have positive refractive power, while the second, fourth, sixth and eighth lens have negative refractive power. The camera optical lens satisfies the following conditions: 0.70≤f1/f≤1.00; −20.00≤f4/f≤3.50; and 2.30≤f5/f≤4.50; where f denotes a focal length of the camera optical lens, and f1, f4 and f5 respectively denote a focal length of the first lens, the fourth lens and the fifth lens. The camera optical lens in the present disclosure satisfies a design requirement of large aperture, wide angle and ultra-thinness while having good optical functions.