High numerical aperture image forming apparatus using optical fi

Details High numerical aperture image forming apparatus using optical fi High numerical aperture image forming apparatus using optical fi

1991-08-23

1993-09-28

Grimley, A. T.

Recorders

Thermal recording

346108, G01D 1510

Patent

active

052489922

ABSTRACT:
An image forming apparatus uses a printhead including both writing optical fibers and an autofocus optical fiber. Radiation emitting from the fibers is imaged by a high numerical aperture lens on writing and focusing surfaces, respectively. Radiation from the autofocus fiber is reflected back through the lens to a split detector focus sensing device. To produce an adequate detection window for focusing, the numerical aperture of the autofocus fiber is chosen to be substantially less than the numerical aperture of the writing fibers and of the lens.

REFERENCES:
patent: 4990771 (1991-02-01), Minoura et al.
patent: 5146241 (1992-09-01), Ferschl
patent: 5146242 (1992-09-01), Zielinski
patent: 5159352 (1992-10-01), Ferla et al.
patent: 5196866 (1993-03-01), Ferschl et al.

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