OIS Camera Module Actuator Using Sensor Shift Instead of Lens Motion
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Solution Overview
Problem
The increasing weight of lens modules in camera modules makes it difficult to precisely control the driving force for optical image stabilization operations, affecting the accuracy of image stabilization in portable electronic devices.
Innovation Solution
The design includes a sensor substrate with a movable frame that moves perpendicular to the optical axis, supported by a first driving unit with magnetic bodies and coils, and a connection part with rigid and flexible materials to reduce the overall size and weight, allowing for precise image stabilization without moving the heavy lens module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the lens module weight is increased to improve imaging quality, then the imaging performance is improved, but the difficulty of precisely controlling the driving force for optical image stabilization increases
Solution Approach 1:
Instead of moving the heavy lens module for optical image stabilization, the patent inverts the approach by moving the image sensor in the opposite direction to compensate for hand shake. This reduces the weight of the moving component while achieving the same stabilization effect, thereby improving control precision of the driving force.
2Reliability
If the lens module is moved for optical image stabilization, then the image stabilization function is achieved, but the size and weight of the camera module increase
Solution Approach 1:
The patent moves the image sensor instead of the lens module to achieve optical image stabilization. Since the image sensor is significantly lighter than the lens module, this inversion reduces the overall weight of the moving components while maintaining the image stabilization function.
Solution Approach 2:
The connection part between the movable and fixed parts of the sensor substrate uses a flexible structure that allows the image sensor to move for stabilization while keeping the overall camera module compact. This flexible connection enables weight reduction without compromising structural integrity.
3Strength
If the connection part uses rigid materials for strength, then the structural strength is improved, but the flexibility for movement is reduced
Solution Approach 1:
The connection part employs a composite structure combining rigid materials for structural strength and flexible materials for movement capability. This allows the connection part to simultaneously support the mechanical strength needed for durability and the flexibility required for image sensor movement during optical image stabilization.
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 solution enables more precise optical image stabilization with reduced size and weight, improving the camera module's performance and reliability in portable devices by moving the image sensor instead of the lens module, thus requiring less driving force and maintaining reliability.
Implementation Method 1
a first driving unit with magnetic bodies and coils
Data Source
AI summary
An optical image stabilization actuator includes a sensor substrate on which an image sensor having an imaging surface is disposed; a movable frame coupled to the sensor substrate, and movable in a direction parallel to the imaging surface; a fixed frame accommodating the sensor substrate and the movable frame; and a first driving unit disposed on the movable frame and the fixed frame to provide a driving force to the movable frame. The sensor substrate includes a movable part coupled to the movable frame; a fixed part coupled to the fixed frame, and spaced apart from the movable frame in a direction, perpendicular to the imaging surface; and a connection unit connected to the movable part and the fixed part, and the connection unit is connected to the movable part in a direction different from a direction in which the connection unit is connected to the fixed part.