High resolution print bar system

Details High resolution print bar system High resolution print bar system

1991-10-25

1992-11-24

Ullah, Akm E.

Optical waveguides

Optical fiber bundle

Fiber bundle plate

359652, G02B 600, G02B 608

Patent

active

051669994

ABSTRACT:
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.

REFERENCES:
patent: 4331380 (1982-05-01), Rees et al.
patent: 4571022 (1986-02-01), Lama et al.
patent: 4589736 (1986-05-01), Harrigan et al.
patent: 4715682 (1987-12-01), Koek et al.
patent: 5084714 (1992-01-01), Beaman et al.

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