Camera Module Coil Member Protective Layer for Uniform Thickness
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Solution Overview
Problem
Conventional coil members for camera modules suffer from appearance defects and thickness uniformity issues due to high-temperature laser cutting, leading to carbonization of insulating layers and particle dispersion, which requires additional cleaning processes and affects reliability.
Innovation Solution
A coil member design with a substrate having a circuit pattern and protective layers on both surfaces, featuring specific thickness deviations and additional protective layers on edges to enhance adhesion and prevent defects, ensuring uniform thickness and improved reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-temperature laser cutting is used to form unit coil members, then cutting efficiency is improved, but the insulating layer becomes carbonized and particles are generated causing appearance defects
Solution Approach 1:
The patent applies preliminary action by forming a protective layer on the insulating layer before laser cutting. This protective layer prevents carbonization and particle generation during the high-temperature laser cutting process, allowing efficient cutting without appearance defects. The protective layer is removed after cutting, leaving a clean surface.
Solution Approach 2:
The patent uses an intermediary substance (protective layer) between the laser and the insulating layer. This protective layer acts as a mediator that withstands the high-temperature laser cutting while protecting the insulating layer from carbonization, thus enabling efficient cutting without harmful effects.
2Manufacturing precision
If additional cleaning process is added to remove carbonized particles, then appearance quality is improved, but manufacturing complexity increases
Solution Approach 1:
The patent prevents the formation of carbonized particles through preliminary protection during cutting, eliminating the need for subsequent cleaning processes. This approach maintains appearance quality while avoiding additional manufacturing steps.
Solution Approach 2:
The patent converts the potentially harmful high-temperature laser cutting process into a beneficial process by introducing a protective layer that enables the cutting to proceed without causing carbonization, thus eliminating the need for harmful cleaning processes.
3Manufacturing precision
If protective layers are added on both surfaces of the substrate, then thickness uniformity is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by forming protective layers specifically on the first and second surfaces of the substrate where thickness uniformity is needed. The protective layers have different thicknesses in different regions (first protective layer on first surface, second protective layer on second surface), providing localized compensation for thickness variations.
Solution Approach 2:
The patent uses composite material structure by combining the substrate with protective layers made of different materials. The protective layers are formed of materials that can be deposited with precise thickness control, creating a composite structure that achieves overall thickness uniformity.
Data Source
AI summary
A coil member according to an embodiment comprises: a substrate comprising a first surface and a second surface opposite to the first surface, and comprising a hole; a circuit pattern that is disposed on at least one of the first surface and the second surface and comprises a wiring pattern, a plating pattern, and a dummy pattern; and a protective layer that is disposed on the substrate and surrounds the circuit pattern, wherein the protective layer comprises a first protective layer disposed on the first surface and a second protective layer disposed on the second surface, the substrate comprises a first edge disposed on the outer edge of the substrate and a second edge surrounding the hole, and the substrate comprises a 1-1 region adjacent to the first edge, and a 1-2 region, wherein the 1-1 region is disposed between the first edge and the 1-2 region, a 1-1 protective layer is disposed on a first surface of the 1-1 region, a 1-2 protective layer is disposed on a first surface of the 1-2 region, and the thickness deviation of the 1-1 protective layer is 0.1 μm or less.