Folded Camera Module Layout for Stronger OIS Reflector Drive
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Solution Overview
Problem
Existing camera modules in mobile devices face challenges in securing sufficient driving force for the reflector during optical image stabilization due to the limited space, making it difficult to achieve high zoom magnification without increasing the overall length.
Innovation Solution
A folded module design incorporating a rotation holder with a first and second driving unit, utilizing a first and second driving magnet and coil configuration to generate driving force for rotating the reflection member about two axes, and a ball group to support the rotation, enhancing the yaw rotation driving force and optical image stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a reflector is used to change incident light path to achieve desired overall length, then high zoom magnification is enabled, but sufficient driving force for optical image stabilization cannot be secured
Solution Approach 1:
The patent positions the driving unit in the radial direction (another dimension) relative to the rotation axis, rather than along the optical axis. This dimensional change allows the driving coil and magnet to be arranged in a space between the rotation axis ball and guide balls, providing sufficient driving force without increasing the overall length of the camera module.
Solution Approach 2:
The patent creates a localized driving region by positioning the driving unit specifically between the rotation axis ball and guide balls. This local arrangement concentrates the driving force generation in a specific spatial zone, optimizing the use of limited space while ensuring adequate driving force for the reflector's stabilization movement.
2Reliability
If driving components are disposed around the reflector to provide driving force, then optical image stabilization is enabled, but sufficient driving force cannot be secured due to limited space
Solution Approach 1:
The driving unit is positioned in the radial dimension between the rotation axis and guide balls, rather than confining components to the limited space immediately around the reflector. This dimensional repositioning provides adequate room for the driving coil and magnet to generate sufficient force while maintaining compact overall dimensions.
Solution Approach 2:
The patent segments the camera module into distinct functional zones: the reflector assembly for light path folding, the ball group for rotational support, and the driving unit for force generation. This segmentation allows each component to be optimized independently, ensuring the driving unit has sufficient space to generate adequate force for reliable optical image stabilization.
3Ease of operation
If driving components are disposed around the reflector, then rotation is enabled, but sufficient driving force cannot be secured
Solution Approach 1:
The driving unit is positioned in the radial direction between the rotation axis ball and guide balls, utilizing space in a different dimension than traditional axial arrangements. This enables adequate driving force generation while maintaining ease of rotation for the reflector assembly.
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 design provides increased driving force and improved optical image stabilization performance, allowing for high zoom magnification without increasing the overall length of the camera module.
Implementation Method 1
a first driving unit, comprising a first driving magnet and a first driving coil, configured to generate a driving force to rotate the rotation holder about the first axis
Implementation Method 2
a first ball group, disposed between the housing and the rotation holder, comprising one rotation axis ball forming the first axis and two guide balls spaced apart from the rotation axis ball
Implementation Method 3
a camera module disposed in a mobile device may use a reflector to change incident light path
Data Source
AI summary
A folded module includes a housing; a rotation holder supported, together with a reflection member, on the housing to be rotatable about a first axis; a first ball group, disposed between the housing and the rotation holder, comprising one rotation axis ball forming the first axis and two guide balls spaced apart from the rotation axis ball; and a first driving unit, comprising a first driving magnet and a first driving coil, configured to generate a driving force to rotate the rotation holder about the first axis. The first driving magnet and the first driving coil are disposed in a space between the rotation axis ball and the two guide balls to be closer to the two guide balls than the rotation axis ball.