Image Sensor Adhesive Peeling via Convex Portion
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Solution Overview
Problem
Existing image pickup apparatuses face issues with adhesive peeling due to stress in the shear direction, particularly when a force is applied along the optical axis, leading to instability and potential failure in the adhesion between the image sensor and the element holder.
Innovation Solution
The image pickup apparatus incorporates a first holding member with a convex portion extending towards the substrate, where the image sensor is fixed via adhesives within an opening, and a pin portion is used to maintain contact and prevent adhesive peeling by distributing stress through a flexible arm and screw system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If aerial adhesion is used to make the imaging unit smaller, then the size of the imaging unit is reduced, but the adhesive may be peeled off when force is applied to the image sensor
Solution Approach 1:
The patent introduces a convex portion as an intermediary structural element that mediates between the image sensor and the element holder. This convex portion provides a mechanical interlocking feature that supplements the aerial adhesion, preventing adhesive peeling while maintaining the compact design. The convex portion acts as a stress-distributing intermediary that eliminates the harmful shear stress on the adhesive.
2Reliability
If the image sensor is fixed with a receiving piece outside the imaging plane, then the adhesive bonding is stable, but the image sensor becomes larger
Solution Approach 1:
The patent transitions from a two-dimensional bonding approach (receiving piece on the back surface) to a three-dimensional approach by introducing a convex portion that protrudes into the opening. This dimensional change allows the bonding structure to utilize the vertical space within the opening rather than requiring additional lateral space, thus maintaining compactness while achieving stable bonding.
3Volume of moving object
If the element holder has no direct contact surface with the image sensor, then the imaging unit can be made smaller, but the adhesive cannot withstand shear stress when force is applied
Solution Approach 1:
The patent creates a composite bonding system that combines aerial adhesion with mechanical interlocking through the convex portion. This composite approach integrates two different bonding mechanisms: the adhesive provides uniform bonding across the imaging plane, while the convex portion provides mechanical reinforcement. Together, they form a composite structure that achieves both compactness and high shear strength.
Data Source
AI summary
An image pickup apparatus includes an image sensor, a substrate mounted with the image sensor, a first holding member configured to hold the image sensor, and having an opening configured to expose an imaging plane of the image sensor, the image sensor being fixed to the first holding member via an adhesive while the image sensor is housed in the opening of the first holding member, and a convex portion extending in a direction from the first holding member to the substrate.