Camera Module Gyro Sensor Relocation for Shake Detection
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Solution Overview
Problem
In traditional camera modules, the gyro sensor for shake detection is fixed to the side surface of the movable part, which limits the miniaturization and motion space, making it difficult to detect larger shakes in narrow mounting spaces.
Innovation Solution
A camera module design that uses a voice coil motor with a coil and magnet part to tilt the driven part, incorporating a gyro sensor on the fixing part and Hall elements on the base member to detect movements orthogonal to the optical axis, allowing for broader motion space and shake detection in a compact form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the gyro sensor is fixed to the side surface of the movable part, then the shake detection function is achieved, but the miniaturization and motion space are limited
Solution Approach 1:
The gyro sensor is relocated from the side surface of the movable part to the base member (fixing part), changing its spatial position to a different dimension. This allows the sensor to remain outside the motion space while still detecting shakes, resolving the contradiction between miniaturization and motion space requirements
2Measurement precision
If the gyro sensor is fixed to the movable part, then the shake detection is possible, but the mounting space becomes narrow and larger shakes cannot be detected
Solution Approach 1:
The gyro sensor is extracted from the movable part and relocated to the base member. This extraction removes the sensor from the constrained motion space, allowing larger shakes to be detected without being limited by the narrow mounting space of the movable part
3Volume of moving object
If the camera module is miniaturized, then the compact form factor is achieved, but the motion space for shake detection is reduced
Solution Approach 1:
By relocating the gyro sensor to the base member in a different spatial dimension, the system maintains compact volume while preserving the full shake detection range. The sensor detects shakes from the base member's perspective, allowing accurate measurement even when the overall module size is reduced
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 efficient detection and correction of shakes in a smaller form factor, allowing the camera module to operate effectively in limited spaces without deforming the rigid FPC, maintaining gyro sensor output quality and reducing external stress.
Implementation Method 1
when a current flows through coil part 212, a Lorentz force is generated at coil part 212 by interaction between the magnetic field of magnet part 222 and the current flowing through coil part 212
Implementation Method 2
a gyro sensor configured to detect shake of the fixing part
Implementation Method 3
a first Hall element configured to detect a first position resulted from a movement in a first direction orthogonal to an optical axis of a lens part provided to the driven part, and a second Hall element configured to detect a second position resulted from a movement in a second direction orthogonal to the first direction
Data Source
AI summary
Provided is an actuator capable of efficiently detecting the vibration of a driven part which is a movable body (an imaging module, for example), over a wide range even with a narrow mounting space. A fixed body in this actuator comprises: a gyroscope for detecting the vibration of the fixed body; a first Hall element for detecting a first position of a lens part associated with a movement in a first direction orthogonal to the optical axis of the lens part; and a second Hall element for detecting a second position associated with a movement in a second direction orthogonal to the first direction. The vibration of the driven part is corrected on the basis of the vibration of the fixed body detected by the gyroscope and the positions detected by the first and second Hall elements.