Threshold Current Modifying Device for Optical Pickup Head
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Solution Overview
Problem
Existing control modules for electric devices, such as optical disk drives, fail to precisely control output power at varying temperatures due to disregard for threshold currents, leading to errors in power control and reduced device performance and lifespan.
Innovation Solution
A threshold current modifying device and method that calculates and adjusts the operating current based on a functional relationship between temperature and threshold current, using a threshold current calculating module and power control module to ensure precise power control by accounting for threshold currents at different temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the prior technique calculates operating current based on power feedback signal and scale relationship, then the control module can control output power at different temperatures, but the output power is not precisely controlled due to disregarded threshold currents
Solution Approach 1:
The patent modifies the operating current calculation by incorporating threshold current as an additional parameter. The control module calculates operating current using both the power feedback signal (scale relationship) and the threshold current value, which changes with temperature. This dual-parameter approach resolves the contradiction by maintaining temperature adaptability while improving output power control precision through the additional threshold current correction.
2Adaptability or versatility
If the control module increases operating current to compensate for temperature rise, then the electric device can generate output power at different temperatures, but error occurs when threshold current is effectual
Solution Approach 1:
The patent introduces threshold current as an intermediary parameter between temperature and operating current. Instead of directly increasing operating current based on temperature compensation, the system first determines the threshold current value corresponding to the current temperature, then uses this intermediary value to adjust the operating current calculation. This intermediary approach ensures reliable power control accuracy while maintaining temperature compensation capability.
3Device complexity
If the prior technique uses scale relationship for power control, then the control structure is simple, but the calculated operating current includes error due to threshold current disregard
Solution Approach 1:
The patent applies preliminary action by pre-determining threshold current values for different temperatures before the actual power control operation. The system stores threshold current data corresponding to various temperature points, and during operation, it directly retrieves and applies the appropriate threshold current value based on the current temperature. This preliminary preparation maintains relatively simple control structure while significantly improving operating current calculation accuracy by eliminating the need for complex real-time threshold current calculations.
Data Source
AI summary
A threshold current modifying device is provided for an optical pickup head. The optical pickup head initially generates an output power when an operating current is larger than a threshold current of the optical pickup head, and the threshold current is related to a temperature of the optical pickup head in a functional relationship. The threshold current modifying device includes a threshold current calculating module and a power control module. The threshold current calculating module receives a temperature signal from the optical pickup head at a first temperature to output a threshold current signal according to the temperature signal and the functional relationship. The power control module receives the threshold current signal to adjust the operating current.