发明名称 |
Displacement detection method, displacement detection device and recording apparatus for performing recording on master of information recording medium |
摘要 |
A displacement detection method in which by reflecting a light beam on a surface of an object to be measured, a displacement of the surface of the object is detected from a change of the reflected light beam due to a change of the displacement of the surface of the object, includes the steps of: causing light beams to be incident upon a substantially identical position on the surface of the object from at least two light sources confronting each other substantially; detecting by position detectors directional changes of the light beams reflected on the surface of the object, respectively; normalizing output signals of the position detectors by luminous intensities received by the position detectors, respectively; and calculating a sum or a difference of the normalized output signals of the position detectors.
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申请公布号 |
US2004130983(A1) |
申请公布日期 |
2004.07.08 |
申请号 |
US20030695190 |
申请日期 |
2003.10.28 |
申请人 |
TSUKUDA MASAHIKO;ABE SHINYA |
发明人 |
TSUKUDA MASAHIKO;ABE SHINYA |
分类号 |
G01B11/00;G01S7/481;G11B7/26;(IPC1-7):G11B7/00 |
主分类号 |
G01B11/00 |
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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