UV Laser Marking of Microcrystalline Glass for Smartphone Back Covers: Ensuring Readability at a 60° Viewing Angle
Abstract:
The use of microcrystalline glass in smartphone back covers has become increasingly popular due to its aesthetic appeal and durability. This article discusses the process of marking invisible logos on microcrystalline glass using a 355 nm ultraviolet (UV) laser and the techniques employed to ensure that these logos remain legible at a 60° viewing angle.
Introduction:
Microcrystalline glass, known for its high strength and clarity, is an ideal material for smartphone back covers. The challenge lies in marking these covers with logos that are invisible under normal lighting but become visible when illuminated or viewed at a specific angle. The 355 nm UV laser marking machine is a preferred choice for this application due to its precision and the ability to mark without affecting the surface quality of the glass.
Materials and Methods:
The study involves the use of a 355 nm UV laser marking machine to inscribe logos on microcrystalline glass samples. The laser's parameters, including power, speed, and pulse width, are adjusted to achieve the desired marking effect. The focus is on optimizing these parameters to ensure that the logos are not visible under normal lighting conditions but become readable when viewed at a 60° angle.
Results:
The experiments conducted show that by carefully controlling the laser's energy density and pulse duration, it is possible to mark microcrystalline glass in such a way that the logos are invisible to the naked eye under ambient light. When the marked surface is illuminated or viewed at a 60° angle, the logos become visible due to the differential reflection and refraction of light at the laser-etched microstructures.
Discussion:
The readability of the logos at a 60° viewing angle is attributed to the microstructures created by the UV laser on the glass surface. These microstructures act as tiny prisms that scatter light in a controlled manner, revealing the logo when the light hits the surface at a specific angle. The key to achieving this effect lies in the precise control of the laser's energy and the marking strategy employed.
Conclusion:
The use of a 355 nm UV laser marking machine for marking microcrystalline glass smartphone back covers has been proven effective for creating隐形 logos that are only visible at a 60° viewing angle. By optimizing the laser parameters and marking strategy, it is possible to achieve a high level of precision and control over the final appearance of the marked logos, ensuring their readability under specific conditions without compromising the aesthetic integrity of the glass surface.
Keywords: UV Laser Marking, Microcrystalline Glass, Smartphone Back Covers, Invisible Logo, Viewing Angle
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