Light Detection Device Adhesive Layout for Stable Compact Bonding
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Solution Overview
Problem
Existing light detection devices face challenges in achieving stable bonding between a wiring substrate and a light receiving element while preventing the projection of a film-shaped adhesive member, especially when the devices are arranged closely together.
Innovation Solution
The light detection device incorporates a film-shaped adhesive member with a main body portion and projecting portions that extend from the edges of the mounting region, notching the sides and corners, ensuring the adhesive does not project and maintaining a consistent interval between the wiring substrate and light receiving element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a film-shaped adhesive member is disposed in the entire region between the wiring substrate and the light receiving element to realize stable bonding, then bonding stability is improved, but the adhesive member projects from the region making it difficult to arrange multiple devices with reduced intervals
Solution Approach 1:
The film-shaped adhesive member is segmented into a main body portion and multiple projecting portions. The main body portion is disposed within the mounting region while the projecting portions extend only to the edges without projecting outward. This segmentation allows the adhesive to maintain stable bonding coverage while preventing projection that would interfere with adjacent devices.
Solution Approach 2:
Different regions of the adhesive member have different configurations: the main body portion provides extensive coverage for stable bonding, while the projecting portions are specifically designed to extend only to the edges. This local differentiation ensures that bonding stability is maintained in the mounting region while edge projection is prevented for compact device arrangement.
2Area of stationary object
If the film-shaped adhesive member is reduced in size to prevent projection, then device arrangement density is improved, but bonding stability between the wiring substrate and light receiving element deteriorates
Solution Approach 1:
The adhesive member is divided into a main body portion that provides comprehensive coverage for stable bonding and projecting portions that extend to edges without projecting. This segmentation maintains adequate bonding area while preventing projection issues.
Solution Approach 2:
The adhesive member configuration transitions from a simple two-dimensional shape to a multi-dimensional structure with a main body portion and extending projecting portions. This dimensional complexity allows the adhesive to maintain coverage for stable bonding while controlling the extent of projection to prevent interference with adjacent devices.
Data Source
AI summary
A light detection device includes a wiring substrate, a light receiving element, at least one connection member, and a film-shaped adhesive member. The mounting region has a pair of first sides and a pair of second sides. The film-shaped adhesive member is disposed in the mounting region. The film-shaped adhesive member includes a main body portion and at least one projecting portion. The main body portion has a pair of first edges extending so as to notch the mounting region on each first side and a pair of second edges extending so as to notch the mounting region on each second side. The at least one projecting portion extends from at least one edge of the pair of first edges and the pair of second edges.