Lens Moving Module Layout for Low-Interference OIS Sensing
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Solution Overview
Problem
Existing voice coil motor (VCM) technology is difficult to apply to subminiature, low-power camera modules, necessitating research for miniaturization and improved functionality such as autofocus and handshake compensation.
Innovation Solution
A lens moving apparatus with a housing, bobbin, coils, magnets, and elastic units, designed to reduce magnetic field interference, size, and current consumption, while enhancing sensitivity and solderability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If VCM technology is applied to camera modules, then autofocus and handshake compensation functions are achieved, but magnetic field interference increases and device size increases
Solution Approach 1:
The patent extracts the position sensor from the traditional VCM assembly and places it on a separate circuit board. This separation removes the sensor from the magnetic field environment, eliminating magnetic field interference while preserving the autofocus and handshake compensation functions. The circuit board with the position sensor is positioned away from the magnets and coils, achieving functional independence from the magnetic field source.
2Adaptability or versatility
If VCM technology is applied to camera modules, then autofocus and handshake compensation functions are achieved, but device size increases
Solution Approach 1:
The patent segments the camera module into distinct functional components: the VCM assembly (magnets, coils, bobbin) and the position sensor assembly (circuit board with sensor). This segmentation allows each component to be optimized independently and enables more efficient spatial arrangement, reducing overall device volume while maintaining full functionality for autofocus and handshake compensation.
3Loss of energy
If power signal path resistance is reduced, then power consumption decreases, but solderability between circuit board and upper elastic units becomes more difficult
Solution Approach 1:
The patent applies different quality requirements to different parts of the power signal path. In the solder joint regions, the design prioritizes manufacturability and reliability with larger contact areas and optimized soldering geometry. In the conductive path regions away from solder joints, the design minimizes resistance through optimized trace width and material selection. This local differentiation resolves the contradiction between low resistance and ease of soldering.
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 achieves reduced magnetic interference, size, current consumption, and improved sensitivity in OIS driving, along with enhanced solderability and power signal resistance.
Implementation Method 1
a first coil disposed at the bobbin
Implementation Method 2
a first position sensor disposed at the first circuit board
Data Source
AI summary
A lens moving apparatus includes a housing; a bobbin arranged inside the housing; a first coil arranged on the bobbin; first magnets arranged on first to fourth corner portions of the housing, respectively; a first circuit board which is arranged on a first side portion of the housing, and which comprises a first terminal, a second terminal, a third terminal, and a fourth terminal; a first position sensor arranged on the first circuit board and electrically connected to the first to fourth terminals; a first upper elastic unit arranged on the first corner portion of the housing; a second upper elastic unit arranged on the second corner portion of the housing; a third upper elastic unit arranged on the third corner portion of the housing; and a fourth upper elastic unit arranged on the fourth corner portion of the housing.