Lens Module Bracket Curved Surface Stray Light Control
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Solution Overview
Problem
Existing lens modules suffer from imaging quality degradation due to stray light caused by an inclined surface in the bracket, which reflects light and results in purple flashes or flares, impacting product quality and cost.
Innovation Solution
A lens module design featuring a VCM bracket with a curved third surface that diffusely reflects light, specifically a circular arc or Lambertian surface, to minimize stray light reaching the sensor, improving imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an inclined surface is used in the bracket, then the structure is simple and easy to manufacture, but stray light is reflected and causes purple flashes or flares that degrade imaging quality
Solution Approach 1:
The patent applies a curved surface (specifically a circular arc surface) on the bracket instead of a flat inclined surface. This curved surface diffusely reflects light through multiple reflections, preventing direct stray light from reaching the sensor while maintaining manufacturing feasibility. The curvature transforms the light reflection pattern from concentrated (causing flares) to dispersed (reducing harmful effects).
Solution Approach 2:
The patent modifies only the specific surface area of the bracket that interacts with light, creating a curved local region while keeping the rest of the bracket structure simple and flat. This localized curvature provides the necessary light diffusion function without complicating the entire bracket design or manufacturing process.
2Object-affected harmful factors
If a curved surface is used to diffuse light, then imaging quality is improved by reducing stray light, but manufacturing complexity increases
Solution Approach 1:
The patent employs a circular arc surface which is a standard curved geometry that can be manufactured using conventional molding or machining techniques. The simplicity of the circular arc design (compared to complex free-form surfaces) allows for relatively easy manufacturing while achieving effective light diffusion through the curved geometry.
Solution Approach 2:
The patent optimizes parameters of the curved surface such as the radius of curvature, position, and orientation to achieve effective light diffusion with minimal manufacturing complexity. By carefully selecting these parameters, the design balances optical performance with manufacturability.
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 curved surface effectively diffuses and weakens stray light, enhancing imaging quality and reducing purple flashes, thereby improving the overall performance and cost-effectiveness of the lens module.
Implementation Method 1
the third surface 815 is a curved surface... the curved surface effectively diffuses and weakens stray light
Data Source
AI summary
The present disclosure provides a lens module. The lens module includes a lens barrel with an accommodation space; a lens group accommodated in the accommodation space; a filter, a bracket and a sensor set in turn by an image side of the lens group and located outside the accommodation space. The bracket includes a top wall forming an optical aperture. The top wall includes a first surface facing an object side, a second surface opposite to the first surface and a third surface connecting the first surface to the second surface for forming an optical aperture. The third surface is a curved surface.