Uniform exposure of photosensitive medium by square intensity pr

Details Uniform exposure of photosensitive medium by square intensity pr Uniform exposure of photosensitive medium by square intensity pr

1997-01-29

2000-01-04

Wong, Peter S.

Facsimile and static presentation processing

Facsimile

Recording apparatus

359224, 348771, 347239, 347255, G02B 2608, G02F 100, B41J 2435

Patent

active

060116315

ABSTRACT:
In classic optical rendering systems, the spot, illuminating a microdot on the photosensitive medium, is designed to overlap with neighboring microdots, typically having an overlap of 1.7 times the pitch of the microdots, for a luminous intensity of 1/e.sup.2 the highest intensity. A "sharp" photosensitive medium, such as a photographic film used in graphical applications, generates a binary circle, obtainable by thresholding. The area of such a circle is too large, which results in higher dot gain.
Many systems, such as electrographic systems, do not behave as a "sharp" medium. If intermediate energy levels are used, in order to obtain continuous tone or multiple density levels, thresholding behavior may be avoided by appropriate choice of energy levels. Such a different sensitometry results in specific requirements for the energy distribution for each microdot.
A square shaped uniform energy distribution within the space allotted to each microdot, allows for multiple density levels, without severe sensitometric requirements.

REFERENCES:
patent: 5331454 (1994-07-01), Hornbeck
patent: 5583688 (1996-12-01), Hornbeck
patent: 5670977 (1997-09-01), Chiu et al.
Nelson, W.E. and Rohit L. Bhuva, "Digital Micromirror Device Imaging Bar for Hardcopy", SPIE vol. 2413, Feb. 6-10, 1995, pp. 58-65.

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