Lens Assembly Autofocus Module Welding Heat Management
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Solution Overview
Problem
The existing lens assembly modules in portable electronic devices face challenges in achieving enhanced optical design quality and manufacturing precision, particularly in the assembly and autofocus functionality, which are affected by high temperatures and heat during welding processes, leading to potential damage and reduced manufacturing yield.
Innovation Solution
A lens assembly module design incorporating a base, cover, lens unit, elastic elements, conductive elements, AF coil elements, and magnetic elements, where the AF coil and conductive elements are electrically connected using a welding method that minimizes heat impact, and additional magnetic field sensing elements for improved autofocus functionality, with optimized geometric configurations for efficient assembly and compact volume utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding method is used to electrically connect AF coil element and conductive elements, then electrical connection reliability is improved, but heat damage to lens unit occurs
Solution Approach 1:
The patent introduces a flexible printed circuit board (FPC) as an intermediary component between the AF coil element and the conductive elements. The FPC serves as a mediator that carries electrical signals while being positioned away from the lens unit, thus enabling reliable electrical connection without subjecting the lens unit to direct heat exposure during welding processes.
Solution Approach 2:
The patent segments the electrical connection system into separate functional components: the AF coil element, the FPC, and the conductive elements. This segmentation allows the welding process to be localized to the FPC and conductive elements rather than directly connecting to the lens unit, thereby isolating the heat-affected zone from the lens unit.
2Adaptability or versatility
If lens unit is movably disposed in cover, then autofocus function is enabled, but assembly precision is reduced
Solution Approach 1:
The patent employs a flexible printed circuit board (FPC) as a thin, flexible film structure that can accommodate the movable lens unit while maintaining stable electrical connections. The FPC's flexibility allows it to bend and move with the lens unit during autofocus operation, ensuring continuous electrical connectivity without compromising assembly precision or requiring complex rigid mounting structures.
Solution Approach 2:
The patent implements a dynamic electrical connection system where the FPC can flex and move along with the lens unit during autofocus operation. This dynamic design allows the lens unit to move freely for focusing while the FPC adapts its position to maintain electrical connectivity, thus enabling autofocus function without sacrificing assembly precision.
3Volume of moving object
If multiple components are integrated in compact module, then device miniaturization is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent integrates multiple functions into the FPC, which serves simultaneously as an electrical connection medium, a structural support element, and a flexible mounting substrate for the AF coil element. This multi-functionality reduces the number of separate components needed, thereby minimizing module volume while keeping manufacturing complexity manageable through the use of a single versatile component.
Solution Approach 2:
The patent merges several functional elements into a unified structure: the FPC combines electrical conductivity, mechanical support, and flexibility in a single component. The AF coil element is integrated with the FPC and lens unit assembly, creating a compact module where multiple components work together as a unified system, reducing overall volume while streamlining the assembly process.
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 enhances the assembly efficiency and manufacturing yield while maintaining imaging quality and stability, reducing the risk of damage from high temperatures and heat, and improving the autofocus functionality, resulting in a more reliable and efficient lens assembly module.
Implementation Method 1
The elastic element includes at least two elastic sheets, and each of the elastic sheets includes an inner portion, an outer portion and an elastic connecting portion
Implementation Method 2
The AF coil element is disposed on the lens unit, wherein one end of the AF coil element is electrically connected to one of the conductive elements
Implementation Method 3
The first magnetic elements are disposed in the cover, face towards the AF coil element and disposed correspondingly to each other along an optical axis of the lens unit
Implementation Method 4
The AF coil element and the conductive elements are electrically connected by a welding method
Data Source
AI summary
A lens assembly module includes a base, a cover, a lens unit, an elastic element, at least two conductive elements, at least one AF coil element and at least two first magnetic elements. The cover is coupled to the base. The lens unit is movably disposed in the cover. The elastic element is coupled to the lens unit. The conductive elements are coupled to the lens unit. The AF coil element is disposed on the lens unit, and two ends of the AF coil element are electrically connected to the conductive elements, respectively. The first magnetic elements are disposed in the cover. A part of each of the inner portions is overlapped along a direction parallel to an optical axis and electrically connected to each conductive element. The AF coil element and the conductive elements are electrically connected by a welding method.