C-Shaped PCB Extending Portions for Liquid Discharge Alignment
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Solution Overview
Problem
Increasing the number of nozzles in liquid discharge devices, such as inkjet printer heads, leads to increased wiring complexity, making accurate positioning of printed circuit board extensions challenging, especially when there is slight displacement during assembly, which can result in unsuccessful alignment between the control circuit board and extended portions.
Innovation Solution
A liquid discharge device with a printed circuit board featuring bent extending portions forming a C-like cross-section, equipped with positioning members that can move along the surface to ensure accurate alignment and connection, even with slight displacement, using positioning pins and a rotatable stage to adjust and maintain positional relationships.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of nozzles is increased to achieve faster printing speed and higher printing resolution, then the printing performance is improved, but the number of wirings is increased making the device more complex
Solution Approach 1:
The printed circuit board is segmented into a connection area and a pair of extended portions that bend oppositely. This segmentation allows wirings to be distributed across multiple separated regions rather than concentrated in one area, reducing wiring complexity while supporting increased nozzle count for higher printing speed and resolution
2Device complexity
If the pair of extended portions are formed by bending ends of the printed circuit board to distribute wirings, then wiring complexity is reduced, but positioning accuracy becomes difficult to achieve due to displacement during assembly
Solution Approach 1:
The extended portions are designed with specific bending configurations that change their geometric parameters. This allows them to accommodate displacement during assembly while maintaining proper wiring distribution, resolving the conflict between simplified wiring arrangement and positioning accuracy
3Ease of manufacture
If the printed circuit board is connected to the pressure applying unit with slight displacement, then assembly tolerance is increased, but the extended portions cannot be positioned accurately for connection with the control circuit board
Solution Approach 1:
The positioning members are designed to be movable along the surface of the liquid discharge head. This dynamic capability allows the positioning members to self-adjust and compensate for displacement between the printed circuit board and pressure applying unit, maintaining accurate positioning of extended portions even with increased assembly tolerance
Data Source
AI summary
A liquid discharge device is provided with a printed circuit board. The printed circuit board is formed with a connection area where a plurality of connection terminals to be connected with a plurality of input terminals of a discharge head, and a pair of extending portions oppositely extending from the connection area, the pair of extending portions being bent with respect to the connection area to form a C-like cross section so that end portions of the pair of extending portions face each other. A plurality of positioning members configured to position the end portions of the pair of extending portions so that the end portions of the extending portions face each other, the plurality of positioning members being configured to be movable along the surface of the liquid discharge head with maintaining a positional relationship among the plurality of positioning members.