Optical System Integrating Coil and Circuit on PCB
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Solution Overview
Problem
The miniaturization of camera modules in electronic devices is hindered by the stacking of components along the optical axis, which increases the overall height, making it difficult to further reduce the thickness for thinner devices.
Innovation Solution
An optical system design where a driving coil and electrical circuit are integrally formed on a circuit board, with the coil partially overlapping the circuit, allowing for reduced height by sharing space and incorporating a position sensor and elastic members to facilitate movement and stabilization of optical components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If components are stacked along the optical axis, then the camera module can be assembled with standard components, but the overall height increases making miniaturization difficult
Solution Approach 1:
The patent transitions from vertical stacking (optical axis direction) to lateral arrangement (perpendicular to optical axis) of components. The circuit board is positioned perpendicular to the optical axis, with the driving coil and electrical circuit arranged side-by-side on the same plane, eliminating the need for vertical stacking and thereby reducing camera module height.
Solution Approach 2:
The driving coil and electrical circuit are integrated onto the same circuit board, forming a unified structure. This merging of previously separate components (driving coil and circuit board) into a single integrated unit reduces the number of stacked layers and minimizes the overall height of the camera module.
2Adaptability or versatility
If the driving coil and electrical circuit are separately stacked, then each component can be optimized independently, but the overall height increases
Solution Approach 1:
The driving coil and electrical circuit are combined on the same circuit board substrate. The coil windings are formed directly on the circuit board layers, integrating the electromagnetic actuator and control circuitry into a single unified component structure, thereby reducing height while maintaining independent design freedom.
Solution Approach 2:
The electrical circuit traces are embedded within the multi-layer circuit board structure, with the driving coil windings nested between different circuit layers. This nesting arrangement allows both components to coexist in the same spatial footprint without interfering with each other's functionality.
3Length of stationary object
If components are arranged to reduce height, then miniaturization is achieved, but component layout becomes more constrained
Solution Approach 1:
The circuit board is oriented perpendicular to the optical axis, creating a lateral layout plane that is orthogonal to the traditional vertical stacking direction. This dimensional reorientation provides ample lateral space for arranging components without increasing height, simplifying the layout design process.
Solution Approach 2:
The circuit board serves multiple functions simultaneously: it provides the substrate for the driving coil, carries the electrical circuit traces, supports the lens holder assembly, and acts as the structural mounting platform. This multi-functionality reduces the need for additional separate components and simplifies the overall layout.
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 design reduces the overall height of the optical system along the Z-axis and further minimizes the X-axis and Y-axis dimensions, achieving the goal of miniaturization while maintaining functionality for auto-focusing and image stabilization.
Implementation Method 1
The magnetic element corresponds to the driving coil and is configured to generate an electromagnetic driving force to drive the optical member holder to move relative to the base
Implementation Method 2
The optical member holder is connected to the frame through the first elastic member, so that the optical member holder is suspended in the frame
Data Source
AI summary
An optical system is provided and includes a fixed module, a movable module, a driving coil, an electrical circuit and a magnetic element. The fixed module includes a base and a circuit board, and the movable module includes an optical member holder, configured to hold an optical member. The magnetic element corresponds to the driving coil and is configured to generate an electromagnetic driving force to drive the optical member holder to move relative to the base. The driving coil and the electrical circuit are integrally formed in the circuit board. The driving coil partially overlaps the electrical circuit when viewed along a direction perpendicular to an optical axis of the optical member.