Lens Drive Motor Spring Unit for Stable Current in Compact Cameras
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Solution Overview
Problem
There is a need for a motor that can minimize size while stably supplying current to a coil, particularly in digital devices with camera lenses, where space constraints are a concern.
Innovation Solution
A motor design featuring a case, yoke, magnet, carrier with lenses, coil, and a spring unit with arc-shaped first and second springs forming a ring shape, where the outer peripheral surface of the spring unit is fixed to the case and the inner peripheral surface is fixed to the carrier for elastic support, with a lead wire connected to the spring unit to supply external power to the coil, and a terminal on a spacer connecting to the main PCB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional spring electrically connected to both the coil and main PCB is used, then current can be supplied to the coil, but the device size increases and current supply stability is insufficient
Solution Approach 1:
The patent combines the spring's mechanical support function with its electrical conduction function into a single integrated component. The spring unit includes a support spring that provides both elastic support for the carrier and electrical connection pathways through its structure, eliminating the need for separate electrical connection components and reducing overall motor size while ensuring stable current supply to the coil
Solution Approach 2:
The spring unit is designed to perform multiple functions simultaneously: it provides elastic support for the carrier, serves as an electrical conductor for current supply, and acts as a mechanical connector between the coil assembly and the main PCB. This multi-functional design reduces the number of components needed and minimizes the motor's overall volume
2Volume of moving object
If the motor size is reduced to meet user demands for small-sized digital appliances, then device compactness is improved, but current supply stability to the coil deteriorates
Solution Approach 1:
The patent combines the spring's mechanical support function with its electrical conduction function into a single integrated component. The spring unit includes a support spring that provides both elastic support for the carrier and electrical connection pathways through its structure, eliminating the need for separate electrical connection components and reducing overall motor size while ensuring stable current supply to the coil
Solution Approach 2:
The spring unit is configured to extend in the vertical direction (upward from the carrier) to provide electrical connection, utilizing the vertical dimension within the motor's compact footprint. This dimensional arrangement allows the spring to serve both mechanical and electrical functions without increasing the motor's horizontal footprint, thereby maintaining compactness while ensuring stable current supply
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 motor effectively minimizes size while ensuring stable current supply to the coil, allowing for efficient operation of digital device lenses.
Implementation Method 1
a coil coupled with the carrier, in which the coil cooperates with the magnet to move up and down the carrier
Implementation Method 2
an inner peripheral surface of the spring unit is fixed to the carrier to elastically support the carrier
Data Source
AI summary
A motor for driving lenses is provided. The motor includes a case, a yoke fixed in the case, a magnet fixed in the yoke, a carrier equipped with lenses and installed in the magnet such that the carrier moves up and down within the magnet, a coil coupled with the carrier, in which the coil cooperates with the magnet to move up and down the carrier, a spring unit including first and second springs having arc shapes and being separated from each other while forming a ring shape as a whole, a spacer supporting the outer peripheral surface of the spring unit, and a terminal provided on the spacer.