Gradient index lens array with improved image quality due to str

Details Gradient index lens array with improved image quality due to str Gradient index lens array with improved image quality due to str

1986-10-27

1988-08-02

Corbin, John K.

Photocopying

Contact printing

Light boxes

350 9625, 355 1, G02B 604

Patent

active

047610620

ABSTRACT:
A gradient index lens array having improved stray light characteristics is enabled by coating the surfaces of the fibers comprising the array with a low transmittance, low viscosity material. The index of this material is matched to that of the fiber surface to prevent Fresnel reflection. The interstitial areas of the lens array comprises a light absorbing material. In another embodiment, stray light caused by light scattering at the end faces of the lens array is reduced by masking the end face with a mask having apertures overlying the fiber faces. The mask apertures have slightly smaller diameters to mask out the rough outer edge of the fibers.

REFERENCES:
patent: 2976447 (1961-03-01), McNaney
patent: 3658407 (1972-04-01), Kitano et al.
patent: 3947106 (1976-03-01), Hamaguchi et al.
patent: 3977777 (1976-08-01), Tanaka et al.
patent: 4264130 (1981-04-01), Ogura
patent: 4345833 (1982-08-01), Siegmund
patent: 4424523 (1984-01-01), Snelling et al.
patent: 4509826 (1985-04-01), Araghi

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