Lens Module Yoke Member Thermal Management
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Solution Overview
Problem
The existing methods for combining lens barrels with lens holders using adhesives often result in adhesive overflow, deformation of the lens barrel due to temperature changes during curing, and uneven expansion/contraction caused by UV irradiation, leading to potential optical defects in camera modules.
Innovation Solution
A lens module design featuring a lens barrel and holder with a yoke member made of stainless steel and a holder member of polycarbonate, where the yoke member has a higher thermal conductivity and specific heat capacity, reducing temperature deviations and deformation by using grooves to contain the adhesive and manage thermal expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive is injected to combine lens barrel with lens holder, then bonding strength is improved, but adhesive overflow occurs and lens barrel deformation happens due to heat application
Solution Approach 1:
The patent applies preliminary action by pre-forming recesses in the lens holder before adhesive injection. These recesses are designed to contain the adhesive and control its distribution, preventing overflow and subsequent lens barrel deformation during the bonding process. The recesses are positioned and sized to accommodate the expected adhesive volume and thermal expansion.
Solution Approach 2:
The patent utilizes parameter changes by designing the recesses with specific geometric parameters (depth, width, position) that accommodate thermal expansion of the adhesive during curing. The recesses are positioned at strategic locations to manage heat distribution and prevent excessive temperature rise that would cause lens barrel deformation.
2Productivity
If UV irradiation is applied to cure adhesive, then curing speed is improved, but uneven expansion and contraction occur in lens holder
Solution Approach 1:
The patent applies local quality by creating localized recesses at specific positions on the lens holder surface where adhesive is applied. These recesses are strategically positioned to manage UV irradiation distribution and control local thermal expansion during curing. The recesses ensure that adhesive is contained in specific zones, preventing uneven expansion across the entire lens holder structure.
3Reliability
If adhesive is applied in excess to ensure complete bonding, then bonding coverage is improved, but adhesive overflow occurs causing optical defects
Solution Approach 1:
The patent applies preliminary action by pre-forming recesses in the lens holder that are designed to contain a specific volume of adhesive. These recesses ensure that sufficient adhesive is available for complete bonding coverage while preventing overflow into areas where it would cause optical defects. The recesses act as predetermined containment zones.
Solution Approach 2:
The recesses serve as an intermediary structure between the adhesive and the lens barrel. They mediate the adhesive distribution, ensuring complete bonding coverage while containing the adhesive within defined boundaries to prevent overflow and subsequent optical defects in the camera module.
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 minimizes temperature changes and deformation during the bonding process, reducing the risk of optical defects and ensuring precise alignment and stability of the lens barrel within the holder.
Implementation Method 1
a value obtained by multiplying a density of the second material by a specific heat of the second material may be greater than a value obtained by multiplying a density of the first material by a specific heat of the first material
Implementation Method 2
A thermal conductivity of the yoke member may be higher than a thermal conductivity of the holder member
Data Source
AI summary
A lens module is provided. The lens module includes a lens barrel that accommodates at least one lens; and a lens holder that is coupled to the lens barrel and includes a holder member which is formed of a first material and a yoke member that is disposed on the holder member along an inner edge of the holder member. A first groove is disposed at an inner circumferential surface of the yoke member, and the yoke member is formed of a second material that is different from the first material of the holder member.