We propose a new process for fabrication of plastic rod lenses based on the traditional method of fiber extrusion. The process consists of the following steps: multilayer conjugate extrusion, monomer diffusion between adjacent layers, and photopolymerization of an uncured strand fiber. We call this process a mutual diffusion process for continuous plastic rod lens fabrication. Characteristics of this process are as follows: fast production speed (~100 cm/min), precision control of refractive-index distribution, high angular aperture, and long-term reliability. The optical resolution of the rod-lens array is 300 dpi, which is high enough for application to G3 facsimiles with transmission time of less than 1 min and monochromatic scanners.
© 2003 Optical Society of America
(110.2760) Imaging systems : Gradient-index lenses
(110.4100) Imaging systems : Modulation transfer function
(160.5470) Materials : Polymers
(220.4610) Optical design and fabrication : Optical fabrication
(350.3950) Other areas of optics : Micro-optics
Yoshihiro Uozu and Kazuyuki Horie, "Mutual Diffusion Process for Continuous Fabrication of Graded-Index Plastic Rod Lenses," Appl. Opt. 42, 6342-6348 (2003)