Endoscope Actuator Voltage Compensation via Cable Resistance Measurement
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Solution Overview
Problem
Existing endoscope systems face challenges in accurately calculating and adjusting the driving voltage for actuators to change the focal length of optical systems, especially due to variations in resistance values of transmission cables and actuators over time, which can affect image quality and operational reliability.
Innovation Solution
The endoscope system includes a processor that calculates a combined resistance value of the transmission cable and actuator, using detected driving signal magnitudes and a preset rated current value, to determine and record the driving voltage, allowing for accurate adjustment and reliable operation of the actuator, even with changes in cable length or aging components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the driving voltage is adjusted based on preset values, then the system is simple to operate, but the measurement precision of resistance values deteriorates due to variations in transmission cable and actuator resistance over time
Solution Approach 1:
The system performs preliminary measurement of the actual resistance values of the transmission cable and actuator before operation. The processor measures the resistance of the transmission cable by applying a test voltage and detecting the current, then measures the actuator resistance similarly. These measured values are stored and used for subsequent driving voltage calculations, ensuring accurate compensation for resistance variations without requiring complex real-time monitoring during operation.
2Adaptability or versatility
If the transmission cable length is increased to reach deeper subjects, then the adaptability of the endoscope system improves, but the loss of energy increases due to higher cable resistance
Solution Approach 1:
The system implements feedback by continuously monitoring the actual resistance values of the transmission cable and actuator, then using these measured values to calculate and adjust the driving voltage. The processor measures the transmission cable resistance by applying a test voltage and detecting the resulting current, then uses this feedback information to compensate for energy losses in the calculation of the optimal driving voltage, ensuring efficient power delivery regardless of cable length.
3Reliability
If the driving voltage is increased to compensate for resistance changes, then the reliability of actuator operation improves, but the object-generated harmful factors increase due to excessive current and potential overheating
Solution Approach 1:
The system dynamically adjusts the driving voltage parameter based on measured resistance values. The processor calculates the optimal driving voltage using the formula V = I × (Rcable + Ractuator), where I is the required current, Rcable is the measured transmission cable resistance, and Ractuator is the measured actuator resistance. This parameter adjustment ensures reliable actuator operation while preventing excessive voltage that could cause overheating or damage, as the voltage is precisely matched to the actual resistance conditions.
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
This solution ensures accurate and reliable driving voltage calculation for the actuator, enabling precise focal length adjustments and maintaining image quality, while allowing for prompt start-up of procedures and handling of cable length and aging-related changes.
Implementation Method 1
a detector configured to detect magnitude of the driving signal through the transmission cable
Implementation Method 2
calculate a combined resistance value including a resistance value of the transmission cable and a resistance value of the actuator, based on at least the detected magnitude of the driving signal
Data Source
AI summary
An endoscope system having: a transmission cable electrically connecting an actuator that moves an optical element along an optical axis direction and a driving signal generator for generating and supplying a driving signal for driving the actuator; a detector configured to detect magnitude of the driving signal output from the driving signal generator to be supplied to the actuator through the transmission cable; and a processor configured to supply the driving signal with an initial driving voltage value to the actuator for a predetermined time, calculate a combined resistance value including a resistance value of the transmission cable and a resistance value of the actuator, based on at least the detected magnitude of the driving signal, calculate a driving voltage of the actuator, based on the calculated combined resistance value and a preset rated current value of the actuator, and cause a storage to record the calculated driving voltage.