U.S. Philips Corporation

Johannes G Van Beek

Franciscus C De Haas

Franciscus M Van Laarhoven

Henricus J Ligthart

Petrus H Swinkels

Johannus Me Van Laarhoven

After a plate of electrically insulating, particularly hard and brittle material has been provided with a mask having a very large number of patterned apertures, it is exposed to at least one jet of abrasive powder particles, which jet is moved relative to the plate. In this way a plate is manufactured with a pattern of apertures and/or cavities which are eminently suitable for manipulating electron currents in electronic displays. Plates manufactured in this way may be used, for example, as control plates, spacer plates, or electron transport duct plates in electronic displays.

Method of manufacturing a plate of electrically insulating material

A method of providing a plurality of cavities and/or apertures in a plate or layer wherein, after the plate or layer has been provided with a mask having a plurality of apertures arranged in a pattern, at least one jet of abrasive powder particles is moved relative to the plate. On its exposed surface, the mask is provided with a coating which prevents substantial mechanical stresses from being generated in the mask during the process by the jet of powder particles.

Method of providing a pattern of apertures and/or cavities in a plate of

Display device having plate with electron guiding passages

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Eindhoven, Netherlands

Johannes G Van Beek