Camera Module Filter Seating for Collision Control and UV Bonding
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Solution Overview
Problem
Conventional camera modules face issues with filter and blocking member collisions due to external impacts, shifting or rotation of the filter, and bursting or cracking of thermosetting adhesives during the curing process, especially in micro-scale modules used in small electronic devices like smartphones.
Innovation Solution
The camera module design includes a lens barrel movable in the optical-axis direction with a holder featuring a seating portion and a filter, where the spacing distances and thicknesses are strategically configured to prevent collisions and rotation, and uses UV curable adhesive members to avoid voids and cracking, along with a blocking member to block unnecessary light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the filter is attached to the seating portion of the holder, then the filter is secured in position, but the filter may collide with the holder or shift/rotate due to external impacts
Solution Approach 1:
The patent applies beforehand cushioning by designing the seating portion with a first surface and a second surface positioned at different heights, creating a stepped structure that provides progressive support and cushioning for the filter. This stepped configuration prevents direct collision between the filter and the holder by distributing impact forces across multiple surfaces, thereby maintaining filter position stability while reducing collision damage.
2Strength
If thermosetting adhesive is used to attach components, then strong bonding is achieved, but voids form during curing causing bursting and cracking
Solution Approach 1:
The patent substitutes the chemical curing process of thermosetting adhesive with a UV-curable adhesive system that cures through photopolymerization upon UV light exposure. This replacement eliminates the void formation problem associated with thermal curing, as UV curing occurs rapidly and uniformly without significant volume changes, thereby maintaining bonding strength while improving adhesive integrity and reducing curing time.
3Use of energy by moving object
If the camera module is designed for micro-scale to reduce power consumption, then energy efficiency is improved, but the module becomes more susceptible to shocks and hand tremor
Solution Approach 1:
The patent applies beforehand cushioning by incorporating the stepped seating portion structure with first and second surfaces at different heights, which provides progressive impact absorption for the micro-scale camera module. This design cushions external shocks and vibrations before they reach sensitive components, thereby enhancing shock resistance while maintaining the compact micro-scale form factor and low power consumption characteristics.
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 effectively suppresses filter collisions and rotations, prevents adhesive cracking, and reduces curing time, enhancing the reliability and performance of camera modules in small electronic devices.
Implementation Method 1
uses UV curable adhesive members to avoid voids and cracking
Data Source
AI summary
A camera module includes a lens barrel moving in the direction of the optical axis, a holder disposed below the lens barrel and having a seating portion recessed in the top surface thereof, a filter disposed on the bottom surface of the seating portion of the holder, a first adhesive member disposed between the bottom surface of the seating portion and a lower surface of the filter and comprising a second opening, a second adhesive member disposed in the groove portion to be coupled to the filter, and an image sensor disposed under the filter.