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聚焦塑料纤维透镜是一种新型的塑料光学元件。和中间厚边缘薄的普通透镜不同,其光学特性表现在纤维横截面上的径向折射率分布呈梯度变化,所以也称梯折塑料纤维透镜。折射率在中心轴处为最大,沿半径按抛物线趋势逐步减小n=n_0(1-0.5Ar~2)式中n_0为塑料纤维中心轴上的折射率;r为任一点至中心轴的距离;A为折射率分布常数。改变聚焦塑料纤维的长度,就可获得不同的焦距和物-象距离,若用它来代替普通透镜,可获得焦距很短和直径很小的微透镜,从而为光学系统的微型化开辟了新的途径。聚焦纤维有玻璃纤维和塑料纤维两大类。最早的聚焦玻璃纤维是日本在1967年开发的
Focusing plastic fiber lens is a new type of plastic optical element. Unlike ordinary thin lenses with thick center edges, the optical properties of the lenses are characterized by a gradient in radial refractive index distribution across the cross-section of the fiber, so it is also referred to as a ladder-folded plastic fiber lens. The refractive index is the maximum at the central axis, and gradually decreases along the radius by a parabola trend n = n_0 (1-0.5Ar ~ 2) where n_0 is the refractive index on the central axis of the plastic fiber; r is the distance from any point to the central axis ; A is the refractive index distribution constant. By changing the length of the focused plastic fiber, different focal lengths and object-image distances can be obtained. If it is used instead of ordinary lenses, microlenses with a short focal length and a small diameter can be obtained, thus opening up a new miniaturization of the optical system Way. Focus fiber glass fiber and plastic fiber two categories. The earliest focused fiberglass was developed in Japan in 1967