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10 August 2019 Alignment accuracy of gradient-index rod lens in an array
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Abstract

Lens arrays of gradient-index (GRIN) rods that project an erected unit magnification image are used in light sources of LED printers. It is shown how alignment accuracy of the GRIN rod affects imaging performance to maintain the image uniformity. The coordinates and inclinations of the chief and marginal rays of the GRIN rod that has a different object distance or is tilted are analyzed with the ray matrix. We compare the ray coordinate shift with the object distance difference with that with the GRIN rod optical axis tilt. The image shift with the tilted GRIN rod is several times larger than that with the different object distance of the GRIN rod. However, the image by the tilted GRIN rod shifts parallel on the image plane without being almost blurred. Consequently, the GRIN rod tilt should be minimized sufficiently.

© 2019 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2019/$28.00 © 2019 SPIE
Akihiro Yamamura, Kazuhiko Oka, and Norihiko Nishiguchi "Alignment accuracy of gradient-index rod lens in an array," Optical Engineering 58(8), 085102 (10 August 2019). https://doi.org/10.1117/1.OE.58.8.085102
Received: 2 April 2019; Accepted: 16 July 2019; Published: 10 August 2019
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