| 摘要 |
The resolution of an LED print bar used in printing applications is modified by optically coupling the print bar, in a preferred embodiment, to a two row, square ended, reduction enlargement gradient index lens array. The lens array is modified to have a radiometric speed suitable for printing applications (f/3 or faster) with a total conjugate long enough to maintain optical quality at full field. In a preferred embodiment, a nominal 480 spi print bar is coupled to a modified 0.80X R/E lens array to provide a resolution in an image plane of 600 spi. Other embodiments are described which utilize a plurality of print bars with a combination of unity magnification gradient index lens array in conjunction with a modified R/E lens array.
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