Drive Circuit Board Orientation for Inkjet Carriage Stability
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Solution Overview
Problem
Ink jet printers with piezoelectric elements face issues with signal loss and noise due to high voltage requirements, and mounting drive circuits on carriages leads to mechanical stress and air resistance problems during high-speed reciprocation.
Innovation Solution
A liquid ejecting apparatus with a drive circuit board mounted on a relay board, oriented along the main scanning direction, to reduce stress and air resistance, and featuring a support unit and high/low side transistors for efficient signal control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the drive circuit board is mounted with the mounting face perpendicular to the main scanning direction, then the electrical connection is simplified, but the lateral G-force during reciprocation causes attachment problems and increased air resistance
Solution Approach 1:
The patent changes the mounting orientation of the drive circuit board from perpendicular to parallel with the main scanning direction. This dimensional reorientation allows the board to align with the direction of motion, reducing air resistance and eliminating lateral G-force effects during reciprocation, while maintaining electrical connection functionality through appropriate terminal arrangement.
Solution Approach 2:
The patent modifies the mounting angle parameter of the drive circuit board to be within ±10 degrees of parallel to the main scanning direction. This parameter change optimizes both the mechanical reliability during high-speed reciprocation and the electrical connection performance, resolving the contradiction between simplified connection and attachment reliability.
2Device complexity
If the drive circuit board is mounted with the mounting face perpendicular to the main scanning direction, then the electrical connection is simplified, but the air resistance increases and hinders high-speed reciprocation
Solution Approach 1:
The patent reorients the drive circuit board from a perpendicular mounting face to a parallel mounting face relative to the main scanning direction. This dimensional change reduces the cross-sectional area perpendicular to motion, thereby minimizing air resistance and enabling high-speed reciprocation while maintaining electrical connection simplicity through proper terminal layout.
Solution Approach 2:
The patent specifies mounting the drive circuit board at an angle within ±10 degrees of parallel to the main scanning direction. This parameter optimization reduces air resistance drag coefficient, allowing the carriage to achieve high reciprocation speeds without significant energy loss, while the electrical connection remains functionally simple.
3Power
If a drive circuit is mounted on the carriage, then signal amplification is achieved, but lateral G-force during high-speed reciprocation causes attachment and mounting problems
Solution Approach 1:
The patent reorients the drive circuit board mounting face to be parallel with the main scanning direction, aligning the board with the direction of motion. This eliminates lateral G-force effects during reciprocation, ensuring mounting reliability while preserving the signal amplification capability of the drive circuit through appropriate component placement and connection design.
Solution Approach 2:
The patent specifies mounting the drive circuit board at an angle within ±10 degrees of parallel to the main scanning direction. This parameter change ensures that the drive circuit remains reliably mounted during high-speed reciprocation by eliminating lateral stress, while the signal amplification function is maintained through proper circuit design and terminal connection.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces signal loss, noise, and mechanical stress, enabling stable high-speed operation of the carriage without hindering reciprocation.
Implementation Method 1
an ink jet printer which ejects ink (liquid) using a piezoelectric element (for example, piezo element) has been known
Data Source
AI summary
A liquid ejecting apparatus includes a drive circuit board on which a drive circuit which outputs a driving signal obtained by amplifying the original driving signal is mounted; an actuator substrate which includes an ejecting unit including a piezoelectric element which is driven by the driving signal, and ejects liquid when the piezoelectric element is driven; and a head unit a head unit on which a relay board which relays the driving signal to the piezoelectric element from the drive circuit board, the actuator substrate, the relay board, and the drive circuit board are mounted, and which is mounted on a carriage which reciprocates in an X direction as a main scanning direction. A mounting face of the drive circuit board is attached to the relay board so as to be placed in a direction which goes along the X direction in the main scanning direction of the carriage.