Surface-mounted devices of light-emitting diodes with small lens

US6610598B2 · kind B2 · utility

Assignee

• Solidlite Corporation · TW

Inventor

• Hsing Chen · Baoshan, TW

Key dates

• Filing date: Jun 20, 2002
• Grant date: Aug 26, 2003
• Expiry date: Jun 20, 2022

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L2924/1815

Abstract

The present invention is a surface-mounted device of light-emitting diodes (SMD LED) whose component typically has a plane on the surface. Through the calculation of Snell's Law, most of light fails to be emitted directly from the component because of the difference in the refractive index of the epoxy resin and the atmosphere (the refractive index of the light in the atmosphere is 1, the refractive index of the epoxy resin is around 1.5). It takes several times of refraction and a waste of brightness to allow the light that fails to be emitted directly a chance to be emitted, while leaving some light that might never be emitted. Therefore, the brightness reduces.The surface-mounted devices of light-emitting diodes with small lens for the present invention attach several small lens or diffraction lens on the plane surface of the SMD LED. The lens that enlarges the critical angle increases the direct light-emitting opportunity from the light-emitting chip, which in turn increases the brightness of LED. Besides, the plane surface of the component under the vision of naked eyes wards off the influence on the pick and place operation, while prevents the volume of the component from get…