Lens Actuator Integrating Coil and Sensor on PCB
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Solution Overview
Problem
Existing lens actuators of the VCM type have complex manufacturing processes due to the need for separate wire bonding between coils and position sensors, which can lead to contamination and reduced reliability from foreign objects and increased size.
Innovation Solution
A lens actuator design that integrates a coil pattern and position sensor directly onto a printed circuit board, eliminating the need for wire bonding and using magnetic material on the board to reduce component count and separation space, thereby simplifying manufacturing and preventing foreign object contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wire bonding is used to electrically connect the coil and position sensor to the printed circuit board, then electrical connection is achieved, but the manufacturing process becomes complicated and foreign objects may be introduced
Solution Approach 1:
The patent merges the coil and position sensor directly onto the printed circuit board, eliminating the need for separate wire bonding processes. The coil is formed as a trace pattern on the PCB, and the position sensor is integrated into the same substrate, thereby simplifying the manufacturing process while maintaining reliable electrical connections.
Solution Approach 2:
The patent extracts the wire bonding process from the manufacturing sequence by directly forming electrical connections through PCB traces during standard PCB fabrication. This eliminates the separate wire bonding step that introduces complexity and potential contamination, while achieving the same electrical connection function.
2Reliability
If a separate yoke member is used in the VCM type lens actuator, then magnetic flux path is provided, but the number of components increases and manufacturing process becomes complicated
Solution Approach 1:
The patent merges the yoke function into the printed circuit board by providing a magnetic flux path through the PCB substrate itself. The PCB is designed with magnetic material or magnetic conductive traces that serve as the flux return path, eliminating the need for a separate yoke member while maintaining the magnetic circuit functionality.
Solution Approach 2:
The printed circuit board is given multiple functions: it serves as the electrical connection substrate, the structural support, and the magnetic flux path (yoke). This multi-functionality reduces the total component count and simplifies the manufacturing process by eliminating the separate yoke manufacturing and assembly steps.
3Reliability
If separation space is maintained between the coil, position sensor and yoke, then electromagnetic interference is reduced, but the overall size of the lens actuator increases
Solution Approach 1:
The patent merges the coil, position sensor, and yoke into a single integrated structure on the printed circuit board. The close integration is achieved through careful PCB layout design where the coil traces, sensor elements, and magnetic flux path are arranged in a compact configuration, eliminating the need for large separation spaces while maintaining electromagnetic compatibility.
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 approach simplifies the manufacturing process, reduces costs, and enhances reliability by eliminating wire bonding and the need for a separate yoke member, while also reducing the size of the lens actuator.
Implementation Method 1
a coil pattern part generating electromagnetic force
Data Source
AI summary
There is provided a lens actuator, including: a lens barrel in which at least one lens is provided on an optical axis; a magnetic part provided on one surface of the lens barrel; and a printed circuit board in which a coil pattern part generating electromagnetic force is provided, the printed circuit board having one surface facing the magnetic part, wherein magnetic material is provided on the other surface of the printed circuit board.