COB玻璃透鏡的優(yōu)缺點(diǎn)
亞克力透鏡由有機(jī)玻璃塑膠PMMA或聚碳酸酯PC，特性如下：
1、耐熱只有60~90℃。
2、亞克力與膠水粘接性不良，且不可烘烤，只能采用紫外線UV亞克力膠水與玻璃或鋁件粘接。
當(dāng)LED燈泡燃點(diǎn)時(shí)，散熱體達(dá)到60~90℃或更高溫度，亞克力會(huì)發(fā)生如上圖右圖嚴(yán)重收縮變形，UV膠水會(huì)拉開(kāi)，容易發(fā)生掉蓋現(xiàn)象。亞克力長(zhǎng)期高溫工作，其表面會(huì)發(fā)霧發(fā)黃，影響光學(xué)性能，光照度下降。
開(kāi)發(fā)的這種COB玻璃透鏡克服了亞克力透鏡的缺點(diǎn)，其具有：
1、 耐熱，永不變形；
2、 導(dǎo)熱好，幫助LED散熱；
3、 使用普通矽膠自然固化，成本低，且避免員工接觸刺激性UV膠粘劑。
Advantages and Disadvantages of COB Glass Lenses Compared to Acrylic Lenses
Characteristics of Acrylic Lenses (PMMA or PC):
1. Low Heat Resistance:
o Tolerates temperatures only up to 60–90°C.
2. Poor Adhesion with Glue:
o Requires UV-curable acrylic adhesive for bonding with glass or aluminum components.
o Cannot withstand baking or high temperatures.
3. Deformation and Durability Issues:
o At high temperatures (e.g., 60–90°C or above when the LED heatsink operates), acrylic lenses are prone to:
? Severe shrinkage and deformation.
? Glue detachment, leading to covers falling off.
o Prolonged exposure to heat causes the surface to:
? Fog or yellow, impacting optical performance and reducing illumination efficiency.
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Advantages of COB Glass Lenses Over Acrylic Lenses:
1. High Heat Resistance:
o Does not deform under high temperatures, ensuring long-term reliability.
2. Good Thermal Conductivity:
o Effectively dissipates heat, helping to improve LED cooling performance.
3. Cost-Effective and Safer Assembly:
o Utilizes ordinary silicone for natural curing, reducing costs.
o Avoids the need for employees to handle irritating UV adhesives.
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Summary
While acrylic lenses are cost-effective and lightweight, COB glass lenses provide superior durability, heat resistance, and optical stability, making them a better choice for high-performance LED applications, especially where temperature and longevity are critical factors.
