Cavity Circuit Board Screen Printing Mask Segmentation
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Solution Overview
Problem
In screen printing on cavity circuit boards, positional displacement between bonded board members can lead to printing misalignment due to inadequate positioning of the mask member relative to the circuit board.
Innovation Solution
A screen printing device and method utilizing a mask member with separate regions for each electrode pattern, allowing for precise positioning and printing on both the flat-portion and cavity-portion electrode patterns, using distinct mask regions and positioning marks to ensure accurate alignment and minimize misalignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single mask member is used for both flat-portion and cavity-portion electrode patterns, then printing can be performed simultaneously on both patterns, but printing misalignment occurs due to positional displacement between bonded board members
Solution Approach 1:
The mask member is divided into two separate mask members: a first mask member for the flat-portion electrode pattern and a second mask member for the cavity-portion electrode pattern. This segmentation allows each mask member to be independently positioned and aligned with its corresponding electrode pattern, eliminating the printing misalignment issue that occurs when using a single mask member for both patterns.
2Ease of operation
If the mask member is positioned with reference to only one board member, then positioning is simplified, but inadequate positioning occurs for the other board member
Solution Approach 1:
Each mask member is designed with specific positioning characteristics tailored to its corresponding electrode pattern. The first mask member has positioning features optimized for the flat-portion electrode pattern on the upper-layer board member, while the second mask member has positioning features optimized for the cavity-portion electrode pattern on the lower-layer board member. This local optimization ensures accurate positioning for each board member without compromising the other.
Data Source
AI summary
A screen printing device and screen printing method in which, in screen printing which is to be applied to a cavity circuit board configured by bonding board members together, printing misalignment hardly occurs. A mask member has a cavity-portion corresponding mask region MRC where a mask pattern MPC corresponding to cavity-portion electrode patterns is formed on the bottom faces of fitting portions to be fitted into cavity portions CV; and a flat-portion corresponding mask region MRF where a mask pattern MPF corresponding to flat-portion electrode patterns is formed as separate regions. Positioning between the cavity-portion corresponding mask region MRC and the cavity-portion electrode patterns is performed, and screen printing is applied. Positioning between the flat-portion corresponding mask region MRF and the flat-portion electrode patterns is performed, and screen printing is applied.