Amplifier Unit Residual Vibration Voltage Amplification Factor Switching
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Solution Overview
Problem
Existing inkjet recording devices face challenges in detecting anomalies in nozzles due to a fixed amplification factor in the circuit that amplifies residual vibration voltage, which is affected by environmental conditions and ink state.
Innovation Solution
A recording device with a simplified configuration that allows switching of the amplification factor of the residual vibration voltage circuit using an operational amplifier, a first resistor, a plurality of switches, and second resistors with different resistance values, enabling the selection of the appropriate resistance ratio for amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed amplification factor is used in the residual vibration voltage circuit, then the circuit configuration is simple, but the measurement precision of nozzle anomalies deteriorates because the signal amplitude cannot adapt to environmental and ink state changes
Solution Approach 1:
The patent implements dynamic adjustment of the amplification factor by introducing switches that can selectively connect different resistor configurations to the operational amplifier. This allows the circuit to transition from a fixed gain configuration to a dynamically adjustable one, adapting to varying signal amplitudes caused by environmental and ink state changes while maintaining relatively simple circuit architecture.
Solution Approach 2:
The patent changes the amplification factor parameter by providing multiple resistor configurations (different resistance values) that can be selected through switch control. This enables the system to adjust the gain parameter to match different signal conditions, improving measurement precision without requiring a completely complex circuit redesign.
2Adaptability or versatility
If multiple resistors with different values are provided to switch amplification factors, then the adaptability to environmental conditions improves, but the device complexity and costs increase
Solution Approach 1:
The patent segments the resistor network into discrete, selectable configurations using switches. Instead of providing a continuous range of resistance values, the circuit is divided into distinct amplification stages (e.g., first and second amplification circuits with different gain factors), each selectable through switch control. This segmentation reduces the overall complexity compared to providing all possible resistor combinations simultaneously.
Solution Approach 2:
The operational amplifier circuit serves multiple functions by being capable of operating in different amplification modes. The same basic circuit architecture can provide multiple amplification factors depending on which resistor configuration is selected, making the circuit universally applicable to different signal conditions without requiring separate dedicated circuits for each gain level.
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 enables effective detection of anomalies in nozzles by adjusting the amplification factor based on environmental and ink conditions, improving the reliability of nozzle anomaly detection without increasing circuit complexity or costs.
Implementation Method 1
a piezoelectric element, and a recording head ejecting liquid by driving the piezoelectric element... residual vibration voltage caused by residual vibration generated in the piezoelectric element
Implementation Method 2
an amplifier unit amplifying and outputting residual vibration voltage caused by residual vibration generated in the piezoelectric element after the piezoelectric element is driven by a drive signal
Data Source
AI summary
Provided is a recording device including an amplifier unit amplifying and outputting residual vibration voltage, and a setting unit setting an amplification factor of the residual vibration voltage by the amplifier unit, wherein the amplifier unit includes an operational amplifier, a first resistor connected to the operational amplifier, a plurality of switches, and a plurality of second resistors having different resistance values and connected to the operational amplifier via each of the plurality of switches, the recording device includes a selection unit selecting any one of the plurality of switches in accordance with the amplification factor set by the setting unit so as to connect any one of the plurality of second resistors to the operational amplifier, and the amplifier unit amplifies the residual vibration voltage with an amplification factor according to a resistance ratio between the first resistor and the second resistor selected by the selection unit.