Five-Lens Camera Optical Lens with Bonded Elements
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Solution Overview
Problem
There is a need for an ultra-thin camera optical lens with a long focal length that achieves excellent optical characteristics, particularly for handheld devices and high-pixel imaging elements, as current lens structures fail to meet the demands for better imaging quality and miniaturization.
Innovation Solution
A camera optical lens design comprising five lenses with specific refractive powers and geometrical constraints, including a bonded second and third lens, which satisfies conditions for focal length ratios, curvature radii, and thickness ratios to enhance imaging quality and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional three-piece or four-piece lens structure is used, then manufacturing complexity is reduced, but imaging quality deteriorates
Solution Approach 1:
The patent combines multiple lens elements into a five-piece lens structure where the second and third lenses are bonded together. This merging approach allows for better correction of optical aberrations and improved imaging quality while maintaining a compact form factor suitable for mobile devices.
Solution Approach 2:
The lens system is divided into five distinct lens pieces with specific refractive powers arranged in sequence. This segmentation allows each lens element to be optimized for specific optical functions, enabling superior imaging performance compared to traditional three or four-piece structures.
2Manufacturing precision
If five-piece, six-piece or seven-piece lens structure is used, then imaging quality is improved, but lens thickness increases
Solution Approach 1:
The patent optimizes specific parameter ratios including the focal length ratio (f1/f between 0.35-0.75), curvature radius ratios (R1/R2 between -5.0-0.2, R3/R4 between 0.2-5.0), and thickness ratios (d1/d2 between 0.5-2.0, d3/d4 between 0.5-2.0). These parameter changes enable the five-piece lens to achieve long focal length with ultra-thin profile while maintaining excellent optical characteristics.
Solution Approach 2:
The patent transitions from traditional short focal length designs to a long focal length design (f/1.8 or longer) while simultaneously reducing overall lens thickness. This dimensional optimization allows the lens to achieve both ultra-thin form factor and long focal length, resolving the contradiction between thickness and optical performance.
3Manufacturing precision
If long focal length is achieved, then imaging performance is improved, but lens sensitivity increases
Solution Approach 1:
The patent carefully controls the focal length ratio of the first lens (f1/f between 0.35-0.75) and optimizes curvature radius ratios to reduce sensitivity. By adjusting these parameters, the lens system achieves long focal length with improved imaging performance while minimizing sensitivity to manufacturing tolerances and alignment variations.
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 ultra-thin lenses with long focal lengths and excellent optical characteristics, suitable for mobile phone and webcam applications, improving imaging performance and reducing lens sensitivity.
Implementation Method 1
a first lens L1 having a positive refractive power; a second lens L2 having a positive refractive power; a third lens L3 having a negative refractive power; a fourth lens L4 having a negative refractive power; and a fifth lens L5 having a positive refractive power
Data Source
AI summary
The present disclosure a camera optical lens comprising, from an object side to an image side, a first lens having a positive refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a negative refractive power, and a fifth lens having a positive refractive power, the second lens is bonded to the third lens, the camera optical lens satisfying conditions of 0.35≤f1/f≤0.75. The camera optical lens can achieve excellent optical characteristics while meeting the designing requirement for having a large aperture and a long focal length, and being ultra-thin.