Image Sensor Actuation With SMA Wire for Tilt Correction
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Solution Overview
Problem
Existing camera devices require complex spring structures and multiple elastic members for lens barrel movement, leading to complicated assembly processes and difficulty in tilt correction, which complicates the module structure and increases production time.
Innovation Solution
A sensor driving device utilizing a shape memory alloy wire and hinge parts to enable relative movement of the image sensor with respect to the lens barrel, allowing for X-axis, Y-axis, and Z-axis movement, as well as tilt correction, without the need for traditional elastic members and magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate capacitor is connected to the sensor electrode to hold electric charge, then the sensor can maintain operation during power-saving periods, but the device complexity increases due to additional components
Solution Approach 1:
The patent combines the capacitor function with the existing sensor electrode structure by forming a capacitor electrode pattern and insulating film layer that work together with the sensor electrode. This integration eliminates the need for completely separate capacitor components while maintaining the charge-holding function for power-saving operation.
Solution Approach 2:
The sensor electrode structure is designed to serve dual purposes: it functions as both the sensing element and part of the capacitor structure. The capacitor electrode pattern and insulating film create a capacitor that can store charge while the same electrode pattern continues to function as the sensor during active periods.
2Reliability
If the sensor electrode is covered with an insulating film to form a capacitor, then the capacitor can hold electric charge effectively, but the sensor measurement precision may deteriorate due to the insulating layer
Solution Approach 1:
The insulating film is applied selectively only in regions where capacitor function is needed, not uniformly across the entire sensor electrode. This localized insulation approach allows the sensor electrode to maintain its sensing precision in uncovered areas while still providing charge-holding capability in the insulated capacitor regions.
Solution Approach 2:
The capacitor structure with insulating film is prepared in advance during the manufacturing process, allowing the sensor electrode to be pre-charged and held in a ready state. This preliminary preparation ensures that when power-saving mode is activated, the charge is already stored and maintained without affecting the sensor's measurement precision during active operation.
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 simplifies the camera module structure, reduces production costs, and enhances image stabilization by eliminating magnetic interference, enabling stable and efficient autofocus and optical image stabilization functions.
Implementation Method 1
a capacitor electrode pattern and an insulating film layer are formed on a sensor electrode
Data Source
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AI summary
A sensor driving device according to an embodiment includes a fixed part including a first substrate on which a first lead pattern part and a first pad are formed; a moving part spaced apart from the fixed part and including a sensor; and a wire part disposed between the moving part and the fixed part, wherein the wire part includes a first wire part of a shape memory alloy having both ends connected to the first pad and moving the moving part with respect to the fixed part; and a second wire part having one end connected to the first lead pattern part and the other end connected to the moving part to elastically support the moving part.