Lens Unit Adhesive Bonding Thrust Surface
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Solution Overview
Problem
Conventional lens units face issues with peeling of antireflective films like black coatings due to tensile forces caused by adhesive curing shrinkage or coefficient of linear expansion differences, leading to reflection and stray light.
Innovation Solution
A lens unit design where the lens is fixed using an adhesive applied to thrust surfaces, avoiding direct contact with the antireflective film, which reduces the risk of peeling by distributing the adhesive force across multiple points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is applied to the end face of the lens to fix it to the lens frame, then the lens can be securely held, but tensile force is generated radially outward due to curing shrinkage or coefficient of linear expansion differences, causing the black coating to peel off
Solution Approach 1:
The invention extracts the adhesive application area from the end face of the lens by introducing a recess in the lens frame. The adhesive is applied to the thrust surface instead, separating the bonding function from the antireflective film area, thus preventing peeling while maintaining secure fixation.
Solution Approach 2:
The recess in the lens frame acts as an intermediary structure that mediates between the lens and lens frame. It provides a dedicated space for adhesive application on the thrust surface, preventing direct contact between adhesive and antireflective film while ensuring secure bonding.
2Ease of manufacture
If adhesive is applied to the end face of the lens, then the lens can be fixed to the lens frame, but the adhesive strength of the black coating is insufficient to resist radial tensile force, leading to peeling
Solution Approach 1:
The invention segments the lens frame structure by introducing a recess that separates the adhesive application area from the antireflective film area. This segmentation allows independent optimization of bonding strength and film integrity, preventing peeling while maintaining ease of manufacture.
3Stability of the object's composition
If the lens is fixed with adhesive on the end face, then bonding is achieved, but curing shrinkage of the adhesive generates radial tensile force that peels off the black coating
Solution Approach 1:
The invention extracts the adhesive application area from the end face by creating a recess in the lens frame. The adhesive is applied to the thrust surface within the recess, separating the bonding function from the antireflective film area. This prevents the radial tensile force from peeling the black coating while maintaining fixation stability.
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
Effectively prevents peeling of antireflective films, ensuring reliable light transmission and reducing stray reflections.
Implementation Method 1
The first adhesive portion bonds the lens and the lens frame with an adhesive applied to the first thrust surface or the second thrust surface
Implementation Method 2
The antireflective film is provided on the end face of the lens, and suppresses the reflection of light incident on the lens at the end face
Data Source
AI summary
A first lens group unit 20 includes a lens L2, a blacked-out portion L2b, a lens frame 22, and an injection hole 21a. The lens L2 has a thrust surface L2d that intersects the direction of the optical axis AX, a thrust surface L2c on the opposite side from the thrust surface L2d, and an edge surface L2e that connects the thrust surface L2d and the thrust surface L2c. The blacked-out portion L2b is provided to an edge surface L2e of the lens L2, and suppresses the reflection of light incident on the lens L2 on the edge surface L2e. The lens frame 22 has a substantially cylindrical shape, and holds the lens L2, which is inserted from the thrust surface L2d side along the cylindrical inner peripheral surface 22a. The injection hole 21a is used to bond the lens L2 and the lens frame 22 with an adhesive applied to the thrust surface L2c.