Six-Lens Camera Module with Aspheric Surfaces for Slim Design
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Solution Overview
Problem
Existing small photographing lens systems face challenges in achieving high functionality and optical performance while maintaining a slim size, as increasing the number of lenses improves optical performance but complicates size reduction and aberration correction.
Innovation Solution
A photographing lens system comprising six lenses with specific refractive powers and surface shapes, including a first lens with negative power, a second lens with positive power, and subsequent lenses with negative or positive powers, arranged from object to image side, along with aspheric surfaces and an aperture stop, to satisfy specific optical and size constraints.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If more lenses are included in the photographing lens system, then optical performance is improved, but the size of the photographing lens system increases
Solution Approach 1:
The photographing lens system is divided into six distinct lens groups (first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6), each with specific refractive powers and surface shapes. This segmentation allows complex optical functions to be distributed across multiple specialized components, achieving high optical performance while maintaining a compact overall structure through optimized arrangement.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lenses (including the object-side surface of the first lens, image-side surface of the second lens, and other surfaces) to change the geometric parameters of the lens surfaces. This parameter change enables better aberration correction and optical performance without requiring additional lens elements, thus maintaining a compact size.
2Reliability
If more lenses are included in the photographing lens system, then aberration characteristics are improved, but the complexity of the system increases
Solution Approach 1:
The patent utilizes aspheric surface parameters (represented by coefficients A, B, C, D, E in the aspheric surface equation) to correct aberrations. By changing the surface geometry parameters rather than adding more lens elements, the system achieves improved aberration characteristics while controlling structural complexity.
Solution Approach 2:
Multiple lenses in the system serve multiple functions simultaneously. For example, the first lens with negative refractive power and meniscus shape convex toward the object side contributes to both focal length control and aberration correction. This multi-functionality reduces the need for additional specialized components, managing system complexity.
3Length of stationary object
If the TTL/DI ratio is reduced for slim design, then the size is reduced, but optical performance may be compromised
Solution Approach 1:
The patent achieves a reduced TTL/DI ratio (slim design) while maintaining optical performance by changing the refractive power distribution among lenses and utilizing aspheric surface parameters. The specific arrangement of six lenses with optimized focal lengths and surface curvatures enables compact form factor without sacrificing image quality.
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 solution enables a compact, high-resolution, and high-performance lens system with improved aberration correction and field of view, achieving a slim design while maintaining optical quality.
Implementation Method 1
a first lens having a negative refractive power
Implementation Method 2
a second lens including an object-side surface convex toward an object side, the second lens having a positive refractive power
Implementation Method 3
a third lens including an image-side surface concave toward an image side, the third lens having a negative refractive power
Data Source
AI summary
A photographing lens system and a photographing apparatus including the photographing lens system are provided. The photographing lens system may include a first lens having a negative refractive power, a second lens having a positive refractive power, a third lens having a negative refractive power, a fourth lens having a negative or positive refractive power, a fifth lens having a negative refractive power, and a sixth lens having a negative or positive refractive power. The first to sixth lenses may be sequentially arranged in a direction from an object side to an image side.