Process for imaging a ferroelectric printing form and printing head
AssigneeMAN Roland Druckmaschinen AG
InventorAlfred Hirt
Life of this patent
Estimating the term…
Abstract
A printing head suitable for imaging a ferroelectric printing form is sealed relative to the printing form by a spring-elastic seal. In the discharge chamber of the printing head, at a low pressure, preferably less than 10 hPa, and especially in the presence of a gas with high ionization probability, a discharge plasma is created, from which charge carriers emerge onto the printing form as the result of activation between electrodes, with simultaneous focussing by the application of electric and/or magnetic fields between plates.
Claims18
A process for imaging a ferroelectric printing form, comprising the steps of:
- producing a discharge plasma in a vacuum, in a discharge chamber of a printing head;
- deflecting electric charge carriers from the plasma by electric attraction in a direction of the printing form to polarize the printing form in accordance with image points;
- and maintaining the vacuum in the discharge chamber with a seal between the printing head and the printing form.
A printing head for imaging a ferroelectric printing form, comprising:
- a discharge chamber;
- and an elastically deformable seal connected to the discharge chamber and configured to sealingly contact a surface of the printing form during printing.
A printing head for imaging a ferroelectric printing form, comprising:
- a discharge chamber;
- an elastically deformable seal connected to the discharge chamber and configured to be sealingly contactable against a surface of the printing form;
- and pump means for producing a vacuum in the discharge chamber.
A printing head for imaging a ferroelectric printing form, comprising:
- a discharge chamber;
- an elastically deformable seal connected to the discharge chamber and configured to be sealingly contactable against a surface of the printing form;
- and at least one electrode operative to produce at least one discharge plasma.
A printing head for imaging a ferroelectric printing form, comprising:
- a discharge chamber;
- an elastically deformable seal connected to the discharge chamber and configured to be sealingly contactable against a surface of the printing form;
- and a plurality of electrodes operative to produce a plurality of discharge plasmas corresponding to the number of electrodes.
Dependencies are inferred from the claim text.