Nine-Lens Optical Camera System with Negative Refractive Powers
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Solution Overview
Problem
The existing optical camera systems for portable electronic devices face challenges in achieving high imaging quality with a large image plane and ultra-thin thickness, due to limitations in refractive power distribution and lens design, which affect the miniaturization and production of camera lenses.
Innovation Solution
The optical camera system is designed with a specific arrangement of nine lenses, including a first lens with a convex object side surface and negative refractive powers in the fifth and ninth lenses, optimized to satisfy various optical parameters such as TTL/ImgH < 1.5 and DT11/ImgH < 0.5, allowing for a compact and efficient light convergence, reducing aberrations, and improving imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to improve imaging quality, then the imaging quality is improved, but the device thickness and complexity increase
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers, curvatures, and thicknesses of individual lenses within the nine-lens system. Specific parameters such as the refractive power of the fifth lens (negative) and ninth lens (negative), along with their respective curvatures and positions, are carefully adjusted to achieve high imaging quality while maintaining ultra-thin overall thickness. The conditional expressions for various parameter combinations demonstrate this systematic parameter optimization approach.
2Manufacturing precision
If the refractive power is increased to improve light convergence, then the imaging quality is improved, but the lens complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies local quality by assigning different refractive power signs and magnitudes to specific lenses based on their positions in the optical system. For example, the fifth lens is designed with negative refractive power while the ninth lens also has negative refractive power, while other lenses have positive refractive power. This localized differentiation of optical properties allows effective aberration correction and light convergence without requiring all lenses to be complex, thereby balancing manufacturing ease with imaging quality.
3Area of stationary object
If the field of view is enlarged to improve imaging coverage, then the imaging coverage is improved, but the lens size and complexity increase
Solution Approach 1:
The patent applies segmentation by dividing the optical system into nine distinct lens elements, each with specific refractive power characteristics. This segmentation allows the complex function of achieving large image plane coverage while maintaining thin profile to be distributed across multiple simpler components. The division into positive and negative power lenses enables sophisticated light path control without requiring any single lens to be overly complex.
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 system achieves a large image plane, ultra-thin thickness, and high imaging quality by effectively distributing refractive power and surface shapes, facilitating production and machining, while maintaining a reasonable lens size and field of view.
Implementation Method 1
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens having refractive powers in order from an object side to an image side along an optical axis
Data Source
AI summary
An optical camera system is provided, including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens having refractive powers. The first lens has a convex object side surface; the fifth lens and the ninth lens have negative refractive powers; and a distance TTL from an object side surface of the first lens to an imaging plane of the optical camera system on the optical axis and a half ImgH of a diagonal length of an effective pixel region of the optical camera system satisfy: TTL/ImgH<1.5.