Optical Imaging Lens Assembly With Light-Shielding Plate Bonding
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Solution Overview
Problem
The challenge in designing optical imaging lenses is to achieve a reduced outer diameter while maintaining image height and ensuring proper assembly, protection, and light shielding without a barrel, as existing methods lead to decentering of lenses during the heating process.
Innovation Solution
An optical imaging lens design incorporating a light-shielding plate and activated reactive bonding films between lens elements, which are pre-assembled to provide assembly, positioning, and shielding functions, using materials like pressure-sensitive adhesive or low-temperature activated films for adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a barrel is removed to reduce outer diameter, then the outer diameter is reduced, but assembly, protection and shielding functions are compromised
Solution Approach 1:
The light-shielding plate is designed to perform multiple functions simultaneously: it provides light shielding to prevent stray light, serves as a mounting structure for lenses through the mounting portions, and acts as a protective element. This multi-functional design replaces the traditional barrel structure, enabling reduction of outer diameter while maintaining assembly and protection functions.
Solution Approach 2:
The patent merges the light-shielding function and the mounting function into a single integrated component - the light-shielding plate with mounting portions. This consolidation eliminates the need for separate barrel structures, allowing the system to achieve compact dimensions while preserving essential functions.
2Ease of manufacture
If heating process is used to melt and connect lens mounting portions, then assembly is achieved, but lens decentering occurs due to air gap changes
Solution Approach 1:
The light-shielding plate is pre-assembled with mounting portions that have predetermined geometries before the heating process. These pre-formed mounting structures provide initial positioning and alignment for the lenses, establishing a stable framework that prevents decentering during subsequent heating and assembly operations.
Solution Approach 2:
The light-shielding plate acts as an intermediary structure between the lens mounting portions and the external environment. It provides a stable reference framework that mediates the heating process, preventing direct thermal-induced deformation and air gap changes that would cause lens decentering, while still allowing the mounting portions to connect properly.
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 design allows for a reduced outer diameter of the lens head portion and improved assembly stability, reducing eccentric shifts and stray light, while maintaining imaging quality.
Implementation Method 1
two pieces of activated reactive bonding film positioned at an object-side surface and an image-side surface of the light-shielding plate
Data Source
AI summary
An optical imaging lens of the present invention comprises a light-shielding plate and two pieces of activated reactive bonding film positioned between two lens elements. The activated reactive bonding film are in a shape of ring. One of the pieces of activated reactive bonding film is positioned between an object-side surface of the light-shielding plate, facing an object side, and an image-side bearing surface of one of the two lens elements, corresponding to the mounting portion and facing an image side, and the other one is positioned between an image-side surface of the light-shielding plate, facing the image side, and an object-side bearing surface of the other one of the two lens elements, corresponding to the mounting portion and facing the object side. With respect to each of the pieces of activated reactive bonding film, the optical imaging lens may satisfy two inequalities.