Light blocking stop for electro-optic line printers

Details Light blocking stop for electro-optic line printers Light blocking stop for electro-optic line printers

1983-04-11

1988-02-09

Weldon, Ulysses

Photocopying

Projection printing and copying cameras

Illumination systems or details

355 8, 354112, G03G 1528

Patent

active

047244674

ABSTRACT:
The stop for the Schlieren imaging optics which are used in an electro-optic line printer to image a multigate light valve onto a photosensitive recording medium has smoothly tapered sides to reduce crosstalk between the pixels of the image. As a result, the transmittance of the imaging aperture, as viewed along the modulation axis of the printer, rolls off relatively gradually and more or less continuously along the edges of the stop, thereby reducing the high angle diffraction off the stop so that the troublesome sidelobes of the coherent amplitude point spread function of the imaging system are suppressed. The stop preferably is in the shape of a parallelogram selected to substantially attenuate either the zero order or the higher order diffraction components of the phase front modulated light beam exiting from the light valve so that the intensity profile of the remaining or unattenuated light has the required image characteristics. Variations in the basic parallelogram shape wherein the stop sides have specially curved configurations to optimize triangular, cosine, and Gaussian light amplitude transmittance profiles are also disclosed.

REFERENCES:
patent: 3681519 (1972-08-01), Larsen et al.
patent: 3731606 (1973-05-01), Geoffray
patent: 4059347 (1977-11-01), Eitel
patent: 4081673 (1978-03-01), Swindell et al.
patent: 4083627 (1978-04-01), Okano
patent: 4183623 (1980-01-01), Haines
patent: 4248517 (1981-02-01), Nishikawa
patent: 4282510 (1981-08-01), Southgate
patent: 4282511 (1981-08-01), Southgate et al.
patent: 4290675 (1981-09-01), Beiser

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