Lens Drive Assembly With Time-Division Sensing and Anti-Flaring Layout
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Solution Overview
Problem
Existing camera modules face challenges in miniaturization and power efficiency, particularly in applying voice coil motor technology to subminiature, low-power devices, and struggle with light flaring due to side surface incidence.
Innovation Solution
A lens moving apparatus with a novel configuration including a base, circuit board, bobbin, coils, magnets, and position sensors, which allows for increased support member length without height increase, improved reliability, and reduced power consumption, while also blocking side light to prevent flaring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the support member length is increased to improve reliability, then the height of the camera module increases
Solution Approach 1:
The support member is configured in a folded or bent shape (U-shape, zigzag, or meander pattern) instead of a straight line, allowing the effective support length to extend in multiple directions while maintaining a compact overall height. This dimensional transformation enables the support member to achieve greater length without proportionally increasing the vertical height of the camera module.
2Adaptability or versatility
If voice coil motor technology is applied to achieve autofocusing, then the device complexity increases for subminiature, low-power applications
Solution Approach 1:
The voice coil motor components (coil, magnet, support member) are integrated into a compact assembly where the coil is wound around the support member and the magnet is positioned adjacent to it. This merged structure eliminates the need for separate actuator components, reducing overall device complexity while maintaining autofocusing capability in subminiature form factor.
3Volume of moving object
If the coil and magnet are positioned close together to reduce size, then the electromagnetic force for driving the lens decreases
Solution Approach 1:
The patent employs optimized magnetic materials and coil configurations that enhance electromagnetic interaction efficiency. By using high-permeability magnetic materials and carefully designed coil windings, the system achieves sufficient electromagnetic force despite the reduced distance between components, maintaining driving capability while minimizing overall size.
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 enhances the reliability and power efficiency of camera modules by enabling longer support members without height increase and effectively inhibits light flaring, improving image quality by minimizing contaminant entry and spots.
Implementation Method 1
each of the first and second sensors is a driver IC (Integrated Circuit) including a Hall sensor and a driver
Implementation Method 2
a first coil disposed on the bobbin, a magnet disposed on the housing, a second coil disposed between the base and the magnet
Data Source
AI summary
An embodiment includes: a base; a circuit board which is disposed on the base and which includes first and second terminals; a housing disposed on the circuit board; a bobbin disposed in the housing; a first coil disposed on the bobbin; a sensing magnet disposed on the bobbin; a magnet disposed in the housing; a first position sensor which is disposed in the housing and which corresponds to the sensing magnet; a second coil disposed between the base and the magnet; and a second position sensor which is disposed on the circuit board and which includes a first sensor and a second sensor, wherein each of the first sensor and the second sensor is a driver integrated circuit including a hall sensor and a driver, a clock signal is provided to the first terminal of the circuit board, a data signal is provided to the second terminal of the circuit board, and the driver of each of the first position sensor, the first sensor, and the second sensor transmits/receives the clock signal through the first terminal of the circuit board, and transmits/receives the data signal in a time-division manner through the second terminal of the circuit board.