Six-Lens Camera Module Spacing for Tilt-Stable Assembly
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Solution Overview
Problem
Six-piece photographing lens assemblies face assembly stability issues due to the fifth and sixth lenses tilting or deforming during assembly, primarily because of the unequal spacing distances between non-effective diameter portions, affecting overall performance.
Innovation Solution
A photographing lens assembly with a six-piece lens group and spacer group configuration, where the spacing distance between the non-effective diameter portions of the fifth and sixth lenses is greater than that of adjacent lenses, and specific ratios and thicknesses are maintained to ensure uniform stress distribution and stability, using spacers to prevent tilting and deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fifth lens is designed with a thicker center and thinner edge to achieve specific optical performance, then the spacing distance between the fifth and sixth lenses increases, but the fifth and sixth lenses are likely to tilt and deform during assembly, affecting assembly stability
Solution Approach 1:
A fifth spacer is introduced as an intermediary component between the fourth lens and the sixth lens. This spacer has a specific thickness and inner diameter that corresponds to the outer diameter of the fifth lens, providing mechanical support and maintaining the increased spacing distance while preventing tilting and deformation of the fifth and sixth lenses during assembly.
Solution Approach 2:
The patent specifies precise parameter relationships: the inner diameter of the fifth spacer corresponds to the outer diameter of the fifth lens, and the thickness of the fifth spacer is controlled within a specific range relative to the spacing distance and center thickness of the fifth lens. These parameter changes ensure both the optical performance and assembly stability are achieved simultaneously.
2Reliability
If the spacing distance between the fifth and sixth lenses is increased, then the optical performance is improved, but the assembly stability deteriorates due to lens tilting and deformation
Solution Approach 1:
The fifth spacer serves as a mediator that maintains the increased spacing distance between the fifth and sixth lenses while providing structural support. The spacer's inner diameter matches the outer diameter of the fifth lens, ensuring precise positioning and preventing assembly deviations.
Solution Approach 2:
The patent defines specific parameter relationships: the thickness of the fifth spacer is controlled within a range of 0.05 to 0.15 times the spacing distance, and the inner diameter of the spacer corresponds to the outer diameter of the fifth lens. These parameter changes enable both improved imaging quality and maintained assembly precision.
3Stability of the object's composition
If spacers are added to maintain spacing and prevent deformation, then assembly stability is improved, but the device complexity increases
Solution Approach 1:
The fifth spacer is positioned strategically between the fourth lens and the sixth lens, where it is needed to support the fifth lens. This targeted placement provides stability without requiring spacers throughout the entire lens assembly, thus limiting the increase in structural complexity.
Solution Approach 2:
Instead of adding spacers uniformly across all lens interfaces, the patent applies the spacer specifically at the location where the fifth lens requires support due to its thicker-center design. This localized approach improves assembly stability while minimizing the overall structural complexity of the lens assembly.
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 enhances assembly stability and moldability of the fifth and sixth lenses, improving imaging quality by reducing stray light and ensuring uniform stress distribution, thereby enhancing the assembly yield and imaging performance.
Implementation Method 1
The spacer group includes a fourth spacer arranged on and in contact with an image-side surface of the fourth lens and a fifth spacer arranged on and in contact with an image-side surface of the fifth lens
Implementation Method 2
The six-piece lens group includes a first lens having a negative refractive power, a second lens having a positive 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, and a sixth lens having a negative refractive power
Data Source
AI summary
Disclosed is a photographing lens assembly. The photographing lens assembly includes a lens barrel and a six-piece lens group and a spacer group that are arranged in the lens barrel; the six-piece lens group includes a first lens having a negative refractive power, a second lens having a positive 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, and a sixth lens having a negative refractive power that are arranged in sequence from an object side to an image side along an optical axis; the spacer group includes a fourth spacer and a fifth spacer; and the photographing lens assembly satisfies: 2.7<f/(f5+f6)<−1.2, −2.0<f1/f3<−1.7, 0.5<(EP45+CP5)/(CT5+T45)<1.4, and 2.2<CT5/EP45<3.4 photographing lens assembly.