| 摘要 |
A lens includes an optically effective portion and a peripheral portion. The optically effective portion is configured for converging light, and includes a first surface, a second surface, and a third surface interconnecting the first and second surfaces. The first and second surfaces are plane surfaces, and are parallel with each other. The third surface is a convex surface. The peripheral portion is arranged surrounding the optically effective portion. The peripheral portion has a fourth surface substantially perpendicular to the first and second surfaces. The third surface is convex away from the fourth surface. The first surface intersects the fourth surface at a first side. The second surface intersects the fourth surface at a second side. The first and second sides have a same length. The length is greater than a distance between the first side and the second side.
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