Transistor and Lowpass Filter for Liquid Ejecting Apparatus
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Solution Overview
Problem
Existing liquid ejecting apparatuses face challenges in achieving high-speed and high-resolution printing due to energy efficiency issues and noise-related problems when increasing the switching frequency of class D amplification, leading to potential erroneous operations and heat generation.
Innovation Solution
A liquid ejecting apparatus with a modulation circuit, transistor, and lowpass filter configuration that suppresses voltage noise and enhances heat dissipation, allowing for increased frequency of the driving signal applied to piezoelectric elements, thereby enabling high-speed and high-resolution printing while maintaining efficient power consumption and heat management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the switching frequency of class D amplification is increased to increase the driving signal frequency for high-speed printing, then the ink ejection frequency increases, but the switching loss increases and energy efficiency deteriorates
Solution Approach 1:
The patent changes the electrical parameters of the transistor by selecting specific electrode configurations (drain electrode width, source electrode width, channel length) to optimize the balance between switching frequency capability and switching loss, enabling high-speed printing while maintaining energy efficiency
Solution Approach 2:
The patent implements dynamic control of the driving signal frequency based on printing conditions, adjusting the switching frequency of the class D amplification to match the required ink ejection frequency while minimizing switching losses through adaptive parameter adjustment
2Manufacturing precision
If the switching frequency of class D amplification is increased to achieve high-resolution printing, then the driving signal frequency increases, but noise and heat generation increase causing erroneous operations
Solution Approach 1:
The patent introduces an intermediary low-pass filter between the class D amplification output and the piezoelectric element input to suppress high-frequency noise while preserving the necessary driving signal components, enabling high-resolution printing without erroneous operations
Solution Approach 2:
The patent converts the inherent switching noise of class D amplification into a beneficial filtering opportunity by using the low-pass filter to remove harmful high-frequency components while maintaining the useful mid-frequency components needed for high-resolution printing
3Speed
If the driving signal frequency is increased for high-speed printing, then the ink ejection frequency increases, but the switching loss in class D amplification increases reducing energy efficiency
Solution Approach 1:
The patent optimizes transistor parameters (electrode dimensions, channel length) to reduce switching loss at high frequencies, enabling high-speed printing with improved power efficiency by changing the electrical characteristics of the amplification circuit
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 apparatus achieves high-speed and high-resolution printing by increasing the frequency of the driving signal without compromising energy efficiency or leading to erroneous operations, thanks to the suppression of voltage noise and improved heat dissipation.
Implementation Method 1
a piezoelectric element that is displaced when the driving signal is applied
Implementation Method 2
a transistor that amplifies the modulated signal to generate an amplified modulated signal
Implementation Method 3
a lowpass filer that smoothes the amplified modulated signal to generate a driving signal
Implementation Method 4
Heat generated in the die transfers to the circuit substrate via the die pad guiding the first electrode to the printed circuit substrate
Data Source
AI summary
A liquid ejecting apparatus includes: a modulation circuit that generates a modulated signal obtained by performing pulse modulation on a source signal; a transistor that amplifies the modulated signal to generate an amplified modulated signal; a lowpass filer that smoothes the amplified modulated signal to generate a driving signal; a piezoelectric element that is displaced when the driving signal is applied; and a circuit substrate on which the modulation circuit, the transistor, and the lowpass filter are mounted. The transistor includes a die, a first electrode, a second electrode, a third electrode, a conductive die pad, a first lead which is electrically connected to the second electrode by a bonding wire, and a second lead which is electrically connected to the third electrode by a bonding wire. The die pad, the first lead, and the second lead are electrically connected to different wiring patterns of the circuit substrate.