Aspherical lens for optical fiber and optically coupling construction using the same

摘要

A construction in which a light emitting/receiving element and an optical fiber are optically coupled by a lens system formed by a biconvex aspherical lens. This lens is featured by: a first lens surface (R1) and a second lens surface (R2) both having a positive refracting power. At least one lens surface is formed by an aspherical surface. A distance L between the light emitting portion and the light receiving portion is 1. 3129 mm L 2.0129 mm. Lens thickness t at its center is 0.2147 mm t 0.8822 mm; and 0.5 |f/&phgr; | 2. 2632 where f=focal length of the lens, and &phgr; =incident pupil diameter.