Voice Coil Motor Slide Rail Layout for Long-Stroke Camera Focus
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Solution Overview
Problem
Current voice coil motors in camera modules have a limited stroke, making it difficult to perform macro photography as the focusing distance exceeds the motor's maximum stroke, resulting in poor photography effects.
Innovation Solution
A voice coil motor with a larger stroke is designed, featuring a slide rail assembly and dual electromagnetic drive assemblies for stable and smooth movement, allowing for both telephoto and macro photography modes, and includes a displacement sensor for precise control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a voice coil motor with a longer stroke is designed to meet macro photography requirements, then the motor stroke is increased, but the device complexity increases
Solution Approach 1:
The movable base is nested within the camera module housing, sliding along guide rails that are integrated into the housing structure. The lens group is nested within the movable base, allowing compact arrangement while achieving extended stroke for macro photography without proportionally increasing overall device complexity
Solution Approach 2:
The voice coil motor transitions from a static fixed-position design to a dynamic sliding structure with the movable base that can move along guide rails. This dynamic configuration enables variable stroke length to accommodate both telephoto and macro photography modes while maintaining manageable device complexity through controlled motion paths
2Device complexity
If a single electromagnetic drive assembly is used, then the device complexity is reduced, but the motion stability deteriorates due to motion tilt angle
Solution Approach 1:
The first and second electromagnetic drive assemblies are positioned asymmetrically at opposite ends of the movable base, creating a balanced force distribution system. This asymmetric placement of identical components ensures that driving forces are applied at different locations, counteracting potential tilt angles and improving motion stability while maintaining reasonable device complexity
Solution Approach 2:
The two electromagnetic drive assemblies function as counterbalancing forces, with each assembly compensating for the tilt and instability that the other might generate. This counterweight principle ensures that when one drive assembly applies force, the other provides stabilizing counter-force, eliminating motion tilt angles and improving overall motion stability
3Device complexity
If the movable base slides along a single guide rail, then the device complexity is reduced, but the motion stability deteriorates
Solution Approach 1:
Two guide rails are positioned asymmetrically at opposite sides of the movable base, creating a stable triangular support structure with the base. This asymmetric placement of identical guide rails provides lateral stability and prevents tilting during sliding motion while maintaining simple individual rail structures
Solution Approach 2:
The two guide rails provide counterbalancing support forces, with each rail compensating for lateral instability that the other might allow. This counterweight principle ensures that the movable base remains stable during sliding by distributing support forces across two separated contact points, preventing tilting and improving sliding stability
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
Enables flexible switching between telephoto and macro photography modes, improving user experience and photography quality by extending the motor's stroke and enhancing motion stability and accuracy.
Implementation Method 1
a first electromagnetic drive assembly and a second electromagnetic drive assembly, configured to supply driving force to the movable base, to drive the movable base to slide in the front and rear directions of the base
Data Source
AI summary
The technology of this application relates to a voice coil motor, a camera module, and an electronic device. The voice coil motor includes a base, a slide rail assembly, disposed in front and rear directions, a movable base, configured to carry a first lens and slidably disposed on the base through the slide rail assembly, and a first electromagnetic drive assembly and a second electromagnetic drive assembly, configured to supply driving force to the movable base, to drive the movable base to slide in the front and rear directions of the base. The first electromagnetic drive assembly and the second electromagnetic drive assembly are respectively disposed on two sides of the slide rail assembly.