Optical Imaging Lens Assembly for Stray Light and Stable Spacing
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Solution Overview
Problem
The presence of stray light and assembly instability in optical imaging lens assemblies due to unreasonable refractive power settings and spacing element designs affect imaging quality and stability, leading to messy light deflection paths and poor assembly stability.
Innovation Solution
An optical imaging lens assembly with a specific arrangement of lenses and spacing elements, including seven lenses with alternating positive and negative refractive powers, and precise spacing element placements, adhering to specific mathematical constraints, to control light convergence and improve assembly stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If refractive powers of lenses are not reasonably set, then the device complexity is reduced, but stray light is produced and imaging quality deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive powers of individual lenses within the lens group. Specifically, it sets the refractive power of the first lens to be greater than that of the second lens, and the refractive power of the third lens to be greater than that of the fourth lens. This systematic parameter adjustment controls light deflection paths to eliminate messy light trajectories and stray light while maintaining manageable device complexity through structured configuration.
2Area of stationary object
If the size of a lens close to the image side is not reasonably set, then the manufacturing ease is improved, but the image plane size cannot be achieved
Solution Approach 1:
The patent applies local quality by assigning specific size characteristics to particular lenses within the lens group. It specifies that the fifth lens has a larger diameter than the sixth lens, and the seventh lens has a larger diameter than the eighth lens. This localized size optimization ensures proper image plane coverage and optical performance in critical regions while allowing other lenses to be manufactured with standard dimensions, thus balancing image plane requirements with manufacturing ease.
3Stability of the object's composition
If the design of spacing element position and size is unreasonable, then the device complexity is reduced, but assembly stability deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring the spacing elements with specific positions and sizes before assembly. It defines that the first spacing element has a first distance from the first lens greater than a second distance from the second lens, and the second spacing element has a third distance from the third lens greater than a fourth distance from the fourth lens. This preliminary design ensures stable lens spacing and alignment during assembly, eliminating the need for complex adjustment mechanisms while maintaining high assembly stability.
4Manufacturing precision
If refractive powers are not reasonably set, then the manufacturing precision requirements are reduced, but light deflection paths become messy producing stray light
Solution Approach 1:
The patent applies parameter changes by establishing specific refractive power relationships between lenses to control light deflection. It sets the refractive power of the first lens greater than the second lens, and the third lens greater than the fourth lens. This structured parameter configuration ensures clean light paths and eliminates stray light while maintaining manufacturing precision through standardized refractive power specifications that can be achieved with conventional manufacturing tolerances.
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 effectively reduces stray light and enhances imaging quality by controlling light deflection and assembly stability, allowing for improved lens manufacturing yield and imaging performance.
Implementation Method 1
a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens having refractive powers. Three lenses of the first lens to the sixth lens have positive refractive powers, and other three lenses of the first lens to the sixth lens have negative refractive powers
Data Source
AI summary
The present disclosure discloses an optical imaging lens assembly. The optical imaging lens assembly includes a lens barrel and a lens group assembled in the lens barrel. The lens group along an optical axis from an object side to an image side sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens having refractive powers. An outer diameter of the seventh lens is greater than an outer diameter of any one of the first lens to the sixth lens; and three lenses of the first lens to the sixth lens have positive refractive powers, and other three lenses of the first lens to the sixth lens have negative refractive powers.