Sensor-Shifting Camera Module for Precise Shake Correction
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Solution Overview
Problem
The increasing weight of lens modules in camera modules, combined with the weight of the driver for moving the lens, makes precise control of shake correction difficult.
Innovation Solution
A sensor shifting actuator with a sensor substrate that includes a movable portion, a fixed portion, and a connection portion, connected by bridges that deform elastically to allow the image sensor to move in two orthogonal directions, using a driver with a coil and movable yoke for precise positioning and shake correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lens module weight is increased to improve camera performance, then image quality is improved, but precise control of shake correction becomes difficult
Solution Approach 1:
Instead of moving the heavy lens module for shake correction, the patent inverts the approach by moving the image sensor in the opposite direction. The image sensor is mounted on a movable sensor substrate that can be precisely positioned by a driver, allowing shake correction without being constrained by the lens module's weight. This inversion enables precise control while maintaining image quality.
2Measurement precision
If the lens module weight is increased to improve camera performance, then image quality is improved, but the driver weight for moving the lens also increases
Solution Approach 1:
The patent moves the image sensor instead of the lens module, inverting the traditional shake correction approach. The image sensor is mounted on a movable sensor substrate that can be precisely positioned by a driver, allowing shake correction without being constrained by the lens module's weight. This inversion enables precise control while maintaining image quality.
3Measurement precision
If the image sensor is moved to correct shake, then shake correction precision is improved, but the sensor substrate structure becomes more complex
Solution Approach 1:
The sensor substrate is segmented into a fixed portion and a movable portion, connected by flexible bridges. This segmentation allows the movable portion to be precisely positioned by the driver while the fixed portion remains stable. The flexible bridges provide both mechanical support and electrical connectivity, simplifying the overall structure compared to traditional rigid mounting approaches.
Solution Approach 2:
The patent uses flexible bridges made of thin film structures to connect the fixed and movable portions of the sensor substrate. These flexible bridges provide mechanical support while allowing precise movement of the image sensor. The thin film structure maintains electrical connectivity during movement, reducing structural complexity compared to rigid wiring approaches.
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
Enables precise control of shake correction and focus adjustment by allowing the image sensor to move in two orthogonal directions, improving image quality by reducing shake and enhancing focus accuracy.
Implementation Method 1
Each of the bridge elements may include a bridge part and a trace part disposed at an end of the bridge part. The first bridge elastically may deform when the image sensor moves in the first direction, and the second bridge elastically may deform when the image sensor moves in the second direction.
Implementation Method 2
The movable yoke portion may be formed of a soft magnetic material magnetized by a magnetic field of the coil portion.
Data Source
AI summary
A sensor shifting actuator includes a sensor substrate on which an image sensor having an imaging surface is disposed; a base configured to accommodate the sensor substrate; and a driver configured to drive the image sensor in a first direction and a second direction, parallel to the imaging surface. The sensor substrate includes a movable portion on which the image sensor is disposed, a fixed portion coupled to the base, and a connection portion disposed between the movable portion and the fixed portion. Depending on a movement direction of the image sensor in the first direction or the second direction, the movable portion and the connection portion relatively move with respect to the fixed portion, or the movable portion relatively moves with respect to the connection portion.