发明名称 |
Fremgangsmåde ved fremstilling af en master til fabrikation af projektionsskærme og en mejsel til udøvelse af fremgangsmåden |
摘要 |
A method of manufacturing a master for projection screens, according to which a pattern of parallel recilinear grooves (33) and ribs (31) is formed on one side of a plate (W) of machinable material by a slotting operation performed by means of a profile chisel (9). The grooves (33) are formed in several steps, several grooves being tooled simultaneously in the various steps each in a different tooling step. The profile chisel (9) is a multiple head chisel and is composed of three subchisels, i.e. a precutting chisel (11), a cutting chisel (13) and a finishing chisel (15). |
申请公布号 |
DK168677(B1) |
申请公布日期 |
1994.05.16 |
申请号 |
DK19880005535 |
申请日期 |
1988.10.04 |
申请人 |
N.V. PHILIPS' GLOEILAMPENFABRIEKEN |
发明人 |
DONA, MARINUS JOSEPHUS JAKOBUS;SWINKELS, JOHANNES MARTINUS MARIA |
分类号 |
G03B21/62;(IPC1-7):G03B21/62 |
主分类号 |
G03B21/62 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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