Abstract

The present invention relates to a method and a device for creating at least one temporary computer-controlled mask (4a) adapted to selectively transmit electromagnetic radiation, comprising the steps of providing a transparent plate (1) having two sides, wherein a capacitive layer (9, 10) is arranged on one of the sides of the transparent plate (1); providing a powder chamber (3) for storing powder particles (4) adapted to prohibit radiation impinging on a masking pattern (4a) formed by the powder particles (4) from reaching certain areas of a particulate build material (20); suspending at least some of the powder particles (4) in the powder chamber (3); depositing electrostatic charges (11) in or on the capacitive layer (9, 10) of the transparent plate (1); generating an electrostatic field in the powder chamber (3), so that at least some of the powder particles (4) become charged; and directly transferring the charged powder particles (4) to the transparent plate (1), thereby forming the masking pattern 4a.

IPC Classes  ?

• G03G 15/08 - Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
• G03G 15/34 - Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups in which the powder image is formed directly on the recording material
• B29C 67/00 - Shaping techniques not covered by groups , or