Method of manufacturing a master intended for the

专利名称：Method of manufacturing a master intended

for the manufacture of projection screensand tool for carrying out the method

发明人：Marinus J. J. Dona,Johannes M. M. Swinkels申请号：US07/371680申请日：19890622公开号：US04955937A公开日：19900911

摘要：A method of manufacturing a master for projection screens, according to whicha pattern of parallel rectilinear grooves (31) and ribs (31) is formed on one side of a plateof machinable material by a slotting operation performed by means of a profile chisel.The grooves (33) are formed in several different tooling steps with, several grooves beingtooled simultaneously. The profile chisel is of multiple construction and is composed ofthree subchisels, i.e. a precutting chisel, a cutting chisel (13) and a finishing chisel.

申请人：U.S. PHILIPS CORPORATION

代理人：John C. Fox

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