Lens Driving Coil Reorientation for Thinner Autofocus Modules
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Solution Overview
Problem
The challenge in miniaturizing electronic devices with camera functionality is the thickness constraint of the lens driving module, which affects the overall device thickness and requires a solution to reduce the module's thickness while maintaining autofocus functionality.
Innovation Solution
An optical member driving mechanism is introduced, featuring a carrier with a driving coil and a positioning column, where the abutting surface is larger than the coil in the optical axis direction, and includes a magnetic driving assembly and elastic members to facilitate movement and positioning, allowing for reduced module thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lens driving module uses a conventional driving coil arrangement with the winding axis parallel to the optical axis, then the autofocus function is achieved, but the module thickness increases
Solution Approach 1:
The patent changes the orientation of the driving coil from having its winding axis parallel to the optical axis to having it perpendicular to the optical axis. This dimensional reorientation allows the magnetic field to act radially on the optical member, achieving autofocus while reducing the axial thickness of the driving module.
2Stability of the object's composition
If the abutting surface size is increased to provide stable support, then the positioning stability is improved, but the device complexity increases
Solution Approach 1:
The patent merges the positioning column and abutting surface into an integrated carrier structure. The positioning column protrudes from the abutting surface, combining support and positioning functions into a single component, which reduces device complexity while maintaining positioning stability.
Solution Approach 2:
The abutting surface is designed with asymmetric dimensions relative to the positioning column, creating an optimized geometric relationship that enhances stability without requiring additional complex structural elements. The surface area is specifically sized to provide adequate support while maintaining a compact overall structure.
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 solution enables a thinner lens driving module while maintaining autofocus capabilities, enhancing the miniaturization of electronic devices with camera functionality.
Implementation Method 1
a driving coil, wherein a winding axis of the driving coil is different from the optical axis in direction
Data Source
AI summary
An optical element driving mechanism is provided. The optical element driving mechanism includes a carrier, a base, and a first driving assembly. The carrier holds an optical element with an optical axis. The carrier is movably connected to the base. The first driving assembly drives the carrier to move relative to the base. The first driving assembly includes a driving coil disposed on the carrier, and the direction of the winding axis of the driving coil is different from the direction of the optical axis. The carrier has an abutting surface, which faces and is in direct contact with the driving coil. The maximum size of the abutting surface is greater than the maximum size of the driving coil in the direction of the optical axis.