Mode of operating of a circuit arrangement for improving the bou

Details Mode of operating of a circuit arrangement for improving the bou Mode of operating of a circuit arrangement for improving the bou

1990-01-22

1991-07-30

Fuller, Benjamin R.

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 121, H04N 123, H04N 1032

Patent

active

050364030

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The invention is directed to the mode of operation of a circuit arrangement for improving the bounce behavior of engraving systems for electromechanically engraving printing forms.


DESCRIPTION OF THE RELATED ART

Engraving systems as employed for electromechanically engraving rotogravure forms have been extensively described in German Patent 2 336 089 in terms of their structure and their functioning.
It becomes clear from the said patent that such a system, this representing a spring-mass system, must be damped on the one hand so that driving with steep contour discontinuities in the image signal does not excite the system to overshoot with attenuated decay in the natural resonance. This would result in image errors in the engraving following steep discontinuities in the gradation values.
On the other hand, however, such a system must be fast enough in terms of its bounce behavior in order to also be able to follow steep discontinuities in gradation value at sharp image contours with adequate speed because sharp image contours in the original would otherwise be reproduced unsharp in the engraving.
Practice has shown that these two demands cannot be satisfied in common in a completely satisfactory way given the high demands that are presently made in reproduction technology. When an engraving system is damped--for instance, with the means disclosed in German Patent 2 336 089--to such an extent that overshooting and decay events are no longer visible in the engraving, then the rise time given steep discontinuities in gradation value is usually no longer short enough in order to reproduce the contours in the engraving with satisfactory sharpness.
German Patent 31 30 353 discloses a method and a circuit arrangement for improving the transient response of electromagnetic transducers. The said patent is particularly directed to utilization in combination with loudspeakers wherein problems that are similar to those set forth above derive due to the pulse character of sound events. Compared to engraving systems, however, loudspeakers need not work down to a lower limit frequency of f.sub.u =0 Hz. Claim 1 of the said patent thus therefore states that a correction signal for improving the transient response is acquired from measuring two successively following peak values. It becomes clear therefrom as well as from the description of the arrangement that this method can only work given operation with alternating current down to a limit frequency of f.sub.u 0.
The arrangement is thus not in the position to improve the bounce behavior of engraving systems since operation down to a limit frequency of f.sub.u =0 is an unalterable demand therefor.
DE-A-27 39 977 that corresponds to FR-A 2 401 722 discloses a method for producing rastered printing forms wherein, for improving the contour reproduction, an original is scanned with higher resolution in scanning direction than the resolution of the printing raster in that additional, intermediate image values are acquired during the analog-to-digital conversion of the image signal between the digital, main image values generated with the frequency of the scan signal and are further-processed with the main image values in the sequence of their creation and are superimposed on the scan signal. Although printing forms are engraved in this method, engraving stylus systems that vibrate greatly are not intended to be compensated.
It is an object of the present invention to specify the mode of operation of a circuit arrangement that improves the bounce behavior of electromagnetic transducers--particularly of engraving systems--down to a limit frequency of 0 Hz.
The invention achieves this on the basis of the operation recited in claim 1. Advantageous developments are recited in the sub-claims.


BRIEF DESCRIPTION OF THE DRAWINGS

The invention shall be set forth in greater detail below with reference to FIGS. 1 through 6.
Shown are:
FIG. 1: the chronological course of the drive signal;
FIG. 2: delayed time signal;
FIG. 3: osc

REFERENCES:
patent: 4245260 (1981-01-01), Doelves
patent: 4259697 (1981-03-01), Doelves
patent: 4536803 (1985-08-01), Henning

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