Piezo Lens Drive Boost Circuit for Compact Voltage Control
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Solution Overview
Problem
The use of a piezoelectric element as a driving source for ultrasound motors in lens driving devices requires a large inductor to boost the input voltage, which hinders size reduction and can alter the electrical characteristics, affecting controllability.
Innovation Solution
An optical element driving device with a boost part comprising an inductor connected in series and a capacitor in parallel to the piezoelectric element, maintaining electrical characteristics while reducing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large inductor is mounted in the lens driving device to boost input voltage, then the desired voltage can be achieved, but the device size increases and mounting becomes difficult
Solution Approach 1:
The patent combines the inductor and capacitor into a single integrated boost circuit unit that is mounted together as one component assembly. This merging approach allows the circuit to achieve the desired voltage boosting function while maintaining a compact form factor that fits within the lens driving device without requiring separate large inductor components.
Solution Approach 2:
The patent employs a boost circuit that dynamically adjusts voltage output based on the piezoelectric element's driving requirements. The circuit uses switching elements to control the inductor and capacitor, enabling adaptive voltage boosting that achieves the necessary drive voltage while optimizing component size through dynamic operation rather than static oversized components.
2Volume of moving object
If a small inductor is mounted in the lens driving device to reduce size, then device size is reduced, but the electrical characteristics change from the desired resonance frequency value
Solution Approach 1:
The patent adjusts the parameters of the boost circuit, specifically the switching frequency and duty cycle of the switching elements, to compensate for the smaller inductor size. By changing these operational parameters, the circuit maintains the desired resonance frequency and electrical characteristics even with reduced component size, achieving both size reduction and characteristic stability.
Solution Approach 2:
The patent incorporates feedback control that monitors the electrical characteristics of the piezoelectric element and adjusts the boost circuit operation accordingly. This feedback mechanism ensures that the resonance frequency and other electrical characteristics remain at desired values by dynamically adjusting the circuit parameters based on actual operating conditions.
3Power
If voltage is boosted using an inductor, then the piezoelectric element can be driven, but the inductor changes the electrical characteristics affecting controllability
Solution Approach 1:
The patent uses feedback control to monitor the piezoelectric element's response and adjust the boost circuit operation in real-time. This feedback mechanism compensates for the inductor's influence on electrical characteristics, maintaining accurate controllability by dynamically adjusting switching parameters based on the element's actual behavior rather than relying on fixed characteristic assumptions.
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
Achieves size reduction without altering electrical characteristics, ensuring effective control of ultrasound motors and improving user-friendliness by integrating components within the device.
Implementation Method 1
a driving part configured to drive the movable part by vibrating a piezoelectric element
Implementation Method 2
The boost part includes an inductor connected in series to the piezoelectric element, and a capacitor connected in parallel to the piezoelectric element
Data Source
AI summary
An optical element driving device according to the present invention comprises a moving part which is capable of holding an optical element, a driving part which drives the moving part by vibrating a piezoelectric element, and a voltage-raising part which raises input voltage that is input into the piezoelectric element, wherein the voltage-raising part has an inductor connected in series to the piezoelectric element and a capacitor connected in parallel to the piezoelectric element. A camera module according to the present invention comprises an optical element driving device and an imaging part which captures a subject image formed by an optical element. A camera-mounted device according to the present invention comprises a camera module and an image processing part which processes image information acquired by the camera module.