Lens Module Spacer Design for Stability and Flare Reduction
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Solution Overview
Problem
The precise assembly of lenses in imaging apparatuses is challenging due to the difficulty in processing seating surfaces with curvature or inclination, leading to stability issues and flare phenomena caused by extraneous light.
Innovation Solution
A lens module design featuring a first spacer with a stepped surface and a second spacer with an undulating inner surface, where the second spacer is positioned on the step of the first spacer, allowing for surface contact with a lens having a non-planar surface, and the spacers are made of different materials to enhance assembly stability and reduce flare.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a spacer is disposed between lenses to maintain gap and prevent flare, then image quality is improved, but assembly stability deteriorates when lens seating surface has curvature or inclination causing line contact
Solution Approach 1:
The first spacer is divided into two distinct portions: a first portion that contacts the lens surface and a second portion that does not contact the lens surface. This segmentation allows each portion to serve different functions - the first portion maintains surface contact for stability while the second portion creates a gap to prevent flare, resolving the contradiction between assembly stability and flare prevention
Solution Approach 2:
Different regions of the spacer are designed with different properties - the first portion has a shape optimized for surface contact with the curved or inclined lens, while the second portion is positioned to maintain a specific gap distance from the lens. This local differentiation enables the spacer to simultaneously achieve stable assembly and effective flare prevention
2Reliability
If lens seating surface is processed to be planar for stable assembly, then assembly stability is improved, but manufacturing precision deteriorates due to difficulty in processing curved or inclined surfaces
Solution Approach 1:
Instead of modifying the lens surface to be planar (the conventional approach), the invention inverts the approach by designing the spacer to adapt to the existing curved or inclined lens surface. The first portion of the spacer is shaped to match the lens surface geometry, allowing stable assembly without requiring difficult planar processing of the lens
Data Source
AI summary
A lens module includes a first lens and a second sequentially disposed along an optical axis of the lens module; a first spacer disposed between the first lens and the second lens; and a second spacer disposed between the first lens and the first spacer, wherein a portion of a first surface of the first spacer facing in a direction of the optical axis is in contact with the first lens, and a remaining portion of the first surface is spaced apart from the first lens, and the second spacer is coupled to the remaining portion of the first surface.