3D Substrate Recess for Endoscope Image Pickup Unit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for a smaller-sized image pickup unit for endoscopes that maintains high positioning precision and allows for efficient resin filling without obstructing the alignment marks, which is essential for reducing the diameter and size of the distal end portion of the insertion portion for minimally invasive procedures.
Innovation Solution
A three-dimensional substrate with a recess portion configuration that includes a first recess for electronic components, a second recess with a wider opening and shallower depth for alignment marks, and a third recess in the form of notches for improved alignment and resin filling, allowing for precise mounting and efficient resin application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a wafer-level camera is used as a small-sized camera module for the image pickup unit, then the size of the distal end portion is reduced, but the positioning precision and alignment mark visibility deteriorate
Solution Approach 1:
The recess portion is divided into a first recess portion for mounting the image pickup module and a second recess portion for providing alignment marks. This segmentation allows the alignment marks to be positioned in a separate area with adequate space, ensuring high positioning precision while maintaining the compact size of the image pickup unit through the use of a small wafer-level camera module.
2Manufacturing precision
If the recess portion is made deeper to improve mounting precision, then the positioning precision is improved, but the resin filling efficiency deteriorates due to obstructed visibility of alignment marks
Solution Approach 1:
The alignment marks are positioned in the second recess portion which has a different depth than the first recess portion. This dimensional differentiation allows resin to be filled from the resin filling port into the first recess portion without obstructing the visibility of alignment marks in the second recess portion, thereby maintaining both mounting precision and resin filling efficiency.
3Volume of moving object
If the opening of the recess portion is made narrower to reduce size, then the miniaturization is achieved, but the resin filling efficiency deteriorates due to restricted resin flow
Solution Approach 1:
The recess portion is segmented into a first recess portion with a narrower opening for mounting the image pickup module and a second recess portion with a wider opening for alignment marks. The resin filling port is positioned to allow resin flow into the first recess portion without being obstructed by the structure of the second recess portion, thereby maintaining resin filling efficiency despite the overall miniaturization of the image pickup unit.
Data Source
AI summary
An image pickup unit includes a three-dimensional substrate which includes a recess portion and an image pickup module which is installed in the recess portion, and the recess portion includes a first recess portion, a second recess portion which communicates with the first recess portion and which has a wider opening and a shallower depth than the first recess portion, and a third recess portion which is formed by providing a notch from a bottom surface of the second recess portion in a depth direction of the first recess portion.