Optical Lens Light-Shielding Sheet Warpage Control
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Solution Overview
Problem
The inner diameter of light-shielding sheets in optical lenses can change due to warpage, affecting stray light blockage and optical imaging quality, as they are easily deformed by forces or heat.
Innovation Solution
An optical lens design featuring a light-shielding sheet and a spacer sequentially arranged along the optical axis, where the spacer provides a protrusion portion that guides the light-shielding sheet to maintain appropriate alignment, ensuring the light-shielding sheet abuts against the lens element, preventing warpage and maintaining optical imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light-shielding sheet is disposed between lens elements to block stray light, then optical imaging quality is improved, but the light-shielding sheet is easily warped by forces or heat causing inner diameter change
Solution Approach 1:
A spacer is introduced as an intermediary component between the light-shielding sheet and the lens element. The spacer includes an abutting surface that contacts the light-shielding sheet and provides mechanical support, preventing the sheet from warping due to thermal expansion or external forces while maintaining its stray light blocking function
Solution Approach 2:
The spacer is designed with an abutting surface that proactively counteracts the warping force before significant deformation occurs. By providing preliminary mechanical support in the opposite direction of potential warpage, the spacer prevents the light-shielding sheet from changing its inner diameter under thermal or mechanical stress
2Stability of the object's composition
If a spacer is disposed between lens elements to maintain appropriate distance, then the light-shielding sheet is supported, but the structure becomes more complex
Solution Approach 1:
The spacer combines multiple functions into a single component: it maintains the appropriate distance between lens elements, supports the light-shielding sheet through its abutting surface, and prevents warpage. This merging of functions reduces the need for separate support structures and simplifies the overall assembly
Data Source
AI summary
An optical lens including a light-shielding sheet and a spacer sequentially arranged along an optical axis from a first side to a second side is provided. No other element is disposed between the light-shielding sheet and the spacer. A second side surface of the light-shielding sheet includes a first surface. A first side surface of the spacer includes an abutting surface and a connecting surface connected to each other, and the connecting surface has a protrusion portion. A cross-sectional line of the abutting surface of the spacer in a radial direction is a straight line and abuts against the first surface of the light-shielding sheet, and an abutment between the abutting surface and the first surface falls on a first reference plane. The light-shielding sheet and a most protruding portion of the protrusion portion are located on a same side of the first reference plane.