发明名称 |
Magneto-optical scanning device with small coil |
摘要 |
A device for writing, reading or erasing a record carrier has a coil with a winding arranged between an objective lens and the record carrier. Optical radiation is focused to a spot, the converging beam passing through the coil opening. A core of a transparent material, having an index of refraction which significantly decreases vergence of the focused beam, is placed in the winding opening. As a result the diameter of the coil can be reduced, and permit increase of the generated magnetic field.
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申请公布号 |
US5307328(A) |
申请公布日期 |
1994.04.26 |
申请号 |
US19920950107 |
申请日期 |
1992.09.23 |
申请人 |
U.S. PHILIPS CORPORATION |
发明人 |
JACOBS, BERNARDUS A. J.;VAN GRINSVEN, PETRUS A. M.;SNIJDERS, WILFRED A. M.;SPRUIT, JOHANNES H. M. |
分类号 |
G11B5/02;G11B11/10;G11B11/105;(IPC1-7):G11B11/00 |
主分类号 |
G11B5/02 |
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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