Lens Bobbin and Housing Structure for Compact AF-OIS Camera Modules
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Solution Overview
Problem
Conventional camera modules face challenges in miniaturization and power consumption, particularly in applying voice coil motors to low-power subminiature camera modules, and require complex structures for optical image stabilization, which complicates the installation of optical image stabilizers and increases the need for additional sensors for accurate focusing.
Innovation Solution
A lens moving apparatus with a simplified structure that includes a bobbin, coil, magnet, and elastic members for auto focusing and optical image stabilization, utilizing support member pairs and a circuit board for power supply and sensor integration to achieve reliable operation in a compact form.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a voice coil motor is applied to a subminiature camera module, then power consumption is reduced, but it is difficult to achieve accurate focusing and optical image stabilization
Solution Approach 1:
The patent combines the auto-focusing voice coil motor and optical image stabilization voice coil motor into a single integrated structure. The OIS magnet is positioned at the end of the AF bobbin, and both coils share a common magnetic circuit, allowing both functions to be achieved in a compact space with reduced power consumption while maintaining focusing accuracy through the integrated design
2Adaptability or versatility
If an optical image stabilizer is installed in a camera module, then image stabilization function is achieved, but the structure becomes complicated and miniaturization is not possible
Solution Approach 1:
The patent merges the OIS mechanism with the AF mechanism by positioning the OIS magnet at the end of the AF bobbin and using a shared magnetic circuit. This integration eliminates separate structures for AF and OIS, achieving image stabilization function while maintaining a compact, simple design that enables miniaturization
Solution Approach 2:
The housing serves multiple functions: it acts as the AF bobbin for the auto-focusing voice coil motor, provides the magnetic circuit for both AF and OIS, and serves as the mounting structure for the OIS coil. This multi-functionality reduces the number of separate components and simplifies the overall structure while achieving both focusing and stabilization
3Measurement precision
If an additional sensor is added to sense the position of the optical module, then accurate focusing is achieved, but the device complexity increases due to electrical connection requirements
Solution Approach 1:
The patent combines the OIS sensor with the AF sensor into a single integrated sensor unit. The OIS sensor is positioned to detect housing position while the AF sensor detects bobbin position, and both sensors share common electrical connection terminals on the circuit board, reducing connection complexity while maintaining accurate position sensing for both functions
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 apparatus enables accurate focusing and optical image stabilization in a miniature camera module with improved reliability and reduced complexity, addressing the challenges of miniaturization and power consumption while integrating auto focusing and optical image stabilization functions.
Implementation Method 1
a first lens moving unit including a bobbin having at least one lens mounted at art inside thereof and a first coil mounted at an outer circumference thereof, a first magnet disposed around the bobbin while being opposite to the first coil, the first lens moving unit moving the bobbin in a first direction parallel to an optical axis by interaction between the first magnet and the first coil
Implementation Method 2
a second lens moving unit including a base spaced apart from the first lens moving unit by a predetermined distance, a plurality of support member pairs for supporting the housing such that the housing is movable relative to the base in second and third directions perpendicular to the first direction, a second coil opposite to the first magnet, and a circuit board having the second coil mounted thereon, the second lens moving unit moving the housing in the second and third directions by interaction between the first magnet and the second coil
Data Source
AI summary
A lens moving apparatus, including a bobbin; a first coil mounted at an outer circumference of the bobbin; a first magnet moving the bobbin in a first direction parallel to an optical axis by interaction with the first coil; a housing supporting the first magnet; an upper elastic member disposed at a top surface of the bobbin and at a top surface of the housing; a lower elastic member disposed at a bottom surface of the bobbin and at a bottom surface of the housing; and first and second winding protrusions disposed with being opposite to each other, the first coil being wound on the first and second winding protrusions.