Due to the development of high power LED lights seriously, Heat ceramic has the characteristics of insulation, heat stability, excellent, etc., not only allows the plate can resist the pressure, no deformation, no oxidation and non-yellowing of the more The coefficient of thermal expansion and phase into the LED street lights chip (Coefficient of Thermal Expansion, CTE) of absolute advantage. Heat ceramic craft classification can be divided into HTCC (High Temperature Co-fired Ceramics) and LTCC (Low Temperature Co-fired Ceramics) two processes of LTCC ceramic punch in the soft baked from raw embryo positioning, followed by co-firing is made under the process conditions of 850 ℃, although this technology is easy shaping, but the burning ceramic low density, low thermal conductivity, mechanical strength and insulating properties are poor, the most important Health embryo by sintering there will be a contraction of the problem, leading to the dimensional accuracy issues to be a breakthrough. Fine line switch to multi-HTCC ceramic, ceramic use the 1300 to 1600 ℃ high temperature sintering, making it more superior than the LTCC ceramic mechanical properties, further drilling positioning the substrate surface and dimensional accuracy .
However, due to the very superior mechanical strength properties in the ceramic cutting tool to the traditional difficult for surface processing, it is often processed to the Diamond Saw or laser. Low-cost diamond knife cutting, and therefore the way to mechanical force, cutting, tool wear and tear will not only result in often to be replaced, but also easily lead to the formation or rupture of the substrate cutting edge, in addition also water cooling limits the application of many of the processes. The laser not only has high accuracy, can be partially processed, cutting speed and easy control of cutting images and other advantages, but also not subject to the limit of the material hardness, brittleness, and melting point, the laser technology is a lot of import ceramic cutting drill.
Laser with the light of the general spontaneous radiation by the luminous light source to stimulate radiation, and this theory as early as 1917 by Einstein derived until 1960 before the artificial ruby by Maiman by stimulated emission of light, called laser, which is subject to enhanced radiation source to stimulate radiation. The main structure of the laser can be divided into three parts, namely, the incentive component, the active medium and resonator incentive components pass into the high voltage to produce discharge effects to give the energy of active medium, the medium will be raised to an excited state from the ground state absorption of specific wavelengths of energy, not stability of the excited state will be reduced-order back to the ground state will release photons to produce the specific wavelengths of light when the light will be reflected in the resonance cavity on both sides of the mirror, when all the light in line with 2L = nλ conditions before they can make the incident and reflected wave phase and interfere with each other to form standing wave excitation photons to produce the standing wave and traveling wave, and finally to form a laser gain traveling wave from the semi-reflective lens wear clothing. Laser to penetrate the semi-reflective mirror output will be through the lens to focus on the target heat of vaporization, the purpose of cutting punch. Therefore, laser drilling, by raising the laser power or wavelength to be used more easily be absorbed by the material laser technology, the focus within the process, which can effectively enhance the depth of cut and reduce the process time to complete the fast The purpose of mass production.