Electronic gravure engraving apparatus including photo tone and

Details Electronic gravure engraving apparatus including photo tone and Electronic gravure engraving apparatus including photo tone and

1991-01-17

1993-07-20

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

1014631, 409 79, H04N 123, B23C 118

Patent

active

052298612

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to an electronic gravure engraving apparatus, and more particularly to an electronic gravure engraving apparatus in which a stylus is used to engrave cells corresponding to pixels to thereby make a press plate for gravure printing.


BACKGROUND ART

For making a plate for gravure printing, two kinds of methods are mainly known at present. One is a method called a corrosion system. This method is a method to implement chemical corrosion processing to a plate thus to form a press plate. The other is a method called an electronic engraving process system. This method is a method to engrave cells corresponding to pixels while scanning the stylus onto a plate thus to form a press plate. With the corrosion system, there are many uncertain elements because of necessity of the chemical processing. One the contrary, the electronic engraving process system has a merit that processing is easy because of physical processing. However, the electronic engraving process system has a problem that the picture quality is lower than that of the corrosion system. Particularly, a contour portion of a printing type becomes indistinct, so a sharp printing type cannot be provided. A printing type is difficult to read according as the size of the printing type becomes small.


DISCLOSURE OF INVENTION

With the above in view, an object of this invention is to provide an electronic gravure engraving apparatus capable of providing a satisfactory picture on a plate by the electronic engraving process system.
A first feature of this invention is directed to an apparatus for making a press plate for gravure printing by the electronic graving process comprising:
a picture input unit for inputting a manuscript picture as a set of pixels having a density value,
an engraving unit including a stylus for engraving cells corresponding to the respective pixels on a plate, a drive device for vibrating the stylus, and a scanning mechanism for scanning the stylus onto the plate, and
an engraving control unit generating cell width values corresponding to density values provided at the picture input unit by using functions for converting density values for pixels to cell width values indicating sizes of cells to be engraved, delivering these cell width values to the engraving unit to thereby engrave cells of desired sizes,
wherein the engraving control unit recognizes a plurality of picture areas on the maniscript picture and permits application of conversions using different functions for different picture areas.
A second feature of this invention is directed to an apparatus for making a press plate for gravure printing by the electronic graving process comprising:
a picture input unit adapted to scan a manuscript picture prepared on separate photographic printing papers, each paper containing a predetermined picture area, the unit scanning each of the areas with a predetermined resolution to provide pictorial image data represented by a set of pixels having a density value,
an engraving unit including a stylus for engraving cells corresponding to the respective pixels on a plate, a drive device for vibrating the stylus, and a scanning mechanism for scanning the stylus onto the plate, and
an engraving control unit generating cell width values corresponding to density values provided at the picture input unit by using functions for converting density values for pixels to cell width values indicating sizes of cells to be engraved, delivering these cell width values to the engraving unit to thereby engrave cells of desired sizes,
wherein the engraving control unit is caused to have an ability to apply conversions using different functions for different picture areas.
A third feature of this invention is directed to an apparatus for making a press plate for gravure printing by the electronic engraving process comprising:
pictorial image data generation unit to divide a manuscript picture into a plurality of picture areas to generate pictorial image data represented by a set of pixels having a density value,
a pict

REFERENCES:
patent: 4672466 (1987-06-01), Schimpf
DE-Z: Hell-Helio-Klischograph, pp. 14-17-English translation enclosed.
DE-Z: Der Polygraph 19-79, pp. 1585-1590-English translation enclosed.

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