Camera Module Sensor Drive With Magnetic Centering for AF and OIS
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Solution Overview
Problem
The challenge of miniaturizing camera modules with high-pixel and high-frame-rate requirements is hindered by the need for increased motor size and weight to accommodate larger lenses, leading to reduced focusing and anti-vibration capabilities due to limited driving force and increased friction.
Innovation Solution
A photosensitive chip driving device utilizing magnetic members and magnets along the optical axis to stabilize a movable carrier, separate auto-focus and optical anti-vibration functions, and employ guiding slots and supporting apparatuses for precise movement and vibration correction, ensuring miniaturization without increasing motor size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the lens size and weight are increased to meet high-pixel imaging requirements, then the imaging quality is improved, but the motor driving force becomes insufficient and the camera module size increases
Solution Approach 1:
The patent replaces the traditional motor-driven mechanical system with a magnetic field-based driving system. Coils generate magnetic fields that interact with magnetic members on the lens holder, enabling precise positioning and vibration compensation without mechanical contact. This eliminates friction and allows for more efficient force transmission to move the heavier lens.
Solution Approach 2:
The magnetic driving system serves multiple functions: it provides both the driving force for auto-focus and the restoring force for vibration compensation. The same coils and magnetic members enable both AF movement and OIS correction, eliminating the need for separate motor systems and reducing overall complexity despite the heavier lens.
2Force
If the motor size is increased to provide sufficient driving force for heavier lenses, then the driving force is improved, but the camera module thickness and complexity increase
Solution Approach 1:
The patent merges the auto-focus driving function and optical image stabilization function into a single integrated magnetic field system. The coils and magnetic members work together to provide both AF driving force and OIS restoring force, eliminating the need for separate motors and reducing device complexity and thickness.
Solution Approach 2:
The magnetic field acts as an intermediary between the control system and the lens holder. Instead of using direct mechanical motor connections, the magnetic field transmits force wirelessly and contactlessly, allowing for more compact design and reduced mechanical complexity while providing sufficient driving force.
3Manufacturing precision
If the lens weight is increased for better imaging, then the imaging quality is improved, but the lens movement speed decreases and friction increases
Solution Approach 1:
The patent replaces friction-based mechanical driving with magnetic field-based contactless driving. The magnetic force acts on the magnetic members attached to the lens holder, moving it without physical contact. This eliminates friction entirely, allowing the heavier lens to move quickly and precisely without speed limitations imposed by mechanical friction.
4Volume of moving object
If the motor-driven lens movement distance is limited due to insufficient driving force, then the motor size is reduced, but the anti-vibration and focusing ability deteriorates
Solution Approach 1:
The magnetic field system provides stronger and more controllable force than traditional motors of the same size. By using electromagnetic interaction between coils and magnetic members, the system can generate sufficient force to move the lens over larger distances for both focusing and vibration compensation, maintaining reliability while keeping the camera module compact.
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
The solution provides stable, accurate, and miniaturized camera modules with enhanced focusing and anti-vibration capabilities by maintaining centering and reducing friction, allowing for larger anti-vibration and focusing distances without increasing motor size or complexity.
Implementation Method 1
a magnetic force generated between a magnetic member and a magnet along the optical axis direction is conducive to maintaining the stability of a movable carrier
Implementation Method 2
the at least one group of coils comprises at least one first coil and at least one second coil, the first coil and the magnet form a first electromagnetic force loop to drive the lens carrier to move along the optical axis direction, and the second coil and the magnet form a second electromagnetic force loop to drive the movable carrier to move along an orthogonal direction of the optical axis
Data Source
AI summary
Disclosed are a photosensitive chip driving device and a camera module. The photosensitive chip driving device, adapted for a photosensitive assembly, includes: a movable carrier for carrying the photosensitive assembly; a fixed base, wherein the fixed base and the movable carrier are disposed correspondingly at intervals along an optical axis direction; a diving apparatus comprising at least one group of coils and at least one group of magnets mounted on the peripheral side of the fixed base, and at least one group of coils being mounted on the peripheral side of the movable carrier; a guiding slot disposed between the movable carrier and the fixed base; a supporting apparatus movably disposed in the guiding slot; and a magnetic member mounted on the movable carrier and disposed corresponding to the magnets, so that a magnetic force along the optical axis direction is generated between the magnetic member and the magnets.