Optical Imaging System with Prism and Aspheric Lenses
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Solution Overview
Problem
The challenge is to develop an optical imaging system for portable electronic devices that achieves high-definition imaging while minimizing size, thereby overcoming the limitations of traditional systems that require increased total track length for higher zoom capabilities.
Innovation Solution
The optical imaging system comprises a prism and seven lenses with specific refractive powers and surface types, including aspheric surfaces. The lenses are arranged to optimize focal lengths, radii of curvature, and spacing distances, ensuring miniaturization and good imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the total track length of the optical imaging system is increased to achieve high-definition imaging and higher zoom multiple, then the imaging quality and zoom capability are improved, but the size of the optical imaging system increases, which severely limits miniaturization
Solution Approach 1:
The patent applies aspheric surfaces to multiple lens elements (first lens object-side surface, second lens image-side surface, third lens image-side surface, fourth lens object-side surface, fifth lens image-side surface, sixth lens object-side surface, and seventh lens image-side surface). These curved non-spherical surfaces enable better light ray control and aberration correction, achieving high-definition imaging with a compact total track length of 11.50mm, thus resolving the contradiction between imaging quality and system size.
2Adaptability or versatility
If the total track length is increased to increase zoom multiple, then the zoom capability is improved, but the miniaturization of the optical imaging system is hindered
Solution Approach 1:
The patent optimizes specific optical parameters including focal lengths (f1=4.30mm, f2=3.80mm, f3=-2.20mm, f4=-2.80mm, f5=3.20mm, f6=-2.50mm, f7=-1.80mm), radii of curvature, and spacing distances between lens elements. These parameter changes enable the system to achieve optical zoom multiple while maintaining a compact total track length of 11.50mm, resolving the contradiction between zoom capability and miniaturization.
3Measurement precision
If multiple lenses with specific refractive powers and surface types are used to correct spherical aberration and enhance imaging quality, then the imaging quality is improved, but the device complexity and machining difficulty increase
Solution Approach 1:
The patent specifies aspheric surfaces for multiple lens elements with defined conic coefficients (k values) and higher-order coefficients (Ai values). While aspheric surfaces improve imaging quality by correcting spherical aberration, the patent provides specific mathematical parameters for manufacturing, balancing optical performance with machining feasibility.
Solution Approach 2:
The patent optimizes the distribution of refractive powers across seven lens elements and specifies precise geometric parameters (radii of curvature, thicknesses, spacing distances) that achieve good imaging quality while considering manufacturing constraints. The total track length is controlled at 11.50mm, and the lens configuration balances optical performance with ease of manufacture.
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 configuration enhances the optical zoom multiple, constrains spherical aberrations, corrects axial spherical aberration, and ensures machining feasibility, resulting in a compact optical imaging system with high imaging quality.
Implementation Method 1
a prism, reflecting light incident to the prism along a first direction, to cause the light to emerge from the prism along a second direction
Implementation Method 2
a first lens, having a refractive power; a second lens, having a positive refractive power, an image-side surface of the second lens being a concave surface
Data Source
AI summary
The present disclosure discloses an optical imaging system, comprising, sequentially along an optical axis from an object side to an image side, a prism, a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, where each of the first lens to the seventh lens has a refractive powers. The prism reflects light incident to the prism along a first direction, to cause the light to emerge from the prism along a second direction. The diaphragm to the seventh lens are sequentially disposed from the prism to the image side along the second direction. The second lens has a positive refractive power, and an image-side surface of the second lens is a concave surface. The third lens has a negative refractive power. The fourth lens has a negative refractive power, and an image-side surface of the fourth lens is a concave surface. The fifth lens has a positive refractive power. At least one of surfaces from an object-side surface of the first lens to an image-side surface of the seventh lens is an aspheric surface.