Rotating Reflection Module Layout for Thin Camera Autofocus
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Solution Overview
Problem
The challenge of miniaturizing camera modules in portable electronic devices is hindered by the addition of autofocusing and optical image stabilization functions, which often require increased thickness due to the placement of lenses and actuators in the longitudinal direction, limiting the reduction of device thickness.
Innovation Solution
The camera module design includes a reflection module with a reflection member mounted on a holder, rotating about axes perpendicular to the optical axis, utilizing a magnet and coil configuration to generate driving forces for precise positioning, allowing lenses to be disposed perpendicularly to the device thickness, thus maintaining device thinness while enabling autofocus and image stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If lenses and actuators are disposed in the longitudinal direction to add autofocusing and optical image stabilization functions, then camera functionality is improved, but device thickness increases
Solution Approach 1:
The patent changes the arrangement dimension from longitudinal (thickness direction) to lateral (width/length direction). Lenses are disposed side-by-side in the width direction rather than stacked in the thickness direction, while the reflection member redirects light paths to achieve autofocus and image stabilization functions without increasing device thickness.
2Measurement precision
If a sensing magnet is provided separately from a driving magnet to improve position sensing accuracy, then sensing accuracy is improved, but device complexity increases
Solution Approach 1:
The patent combines the sensing magnet and driving magnet into a single integrated magnet structure. The magnet includes both a first region that interacts with the coil for driving force generation and a second region that interacts with the position sensor for sensing, eliminating the need for separate magnet components while maintaining both driving and sensing functions.
3Adaptability or versatility
If multiple separate components are used for autofocus and image stabilization, then functional performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent integrates multiple functions into unified components: the reflection member serves both autofocus and image stabilization functions, and the magnet integrates both driving and sensing capabilities. This integration reduces the number of separate components and their associated assembly tolerances, simplifying manufacturing while maintaining functional performance.
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 design enhances position sensing accuracy and enables thin portable electronic devices to incorporate multiple camera functions without increasing thickness, by using integrated magnets and coils to rotate the reflection module, thereby improving autofocus and image stabilization performance.
Implementation Method 1
a magnet and coil configuration to generate driving forces for precise positioning
Implementation Method 2
a reflection member for changing a path of light
Data Source
AI summary
A camera module including a housing, a reflection module including a reflection member and a holder on which the reflection member is mounted, the reflection module being disposed in the housing and rotating about an axis perpendicular to an optical axis, a first magnet and a second magnet mounted on a surface of the holder, a first coil mounted on the housing to face the first magnet and the second magnet, and a first position sensor mounted on the housing to face the first magnet.