发明名称 |
Absolute optical encoder with long range intensity modulation on scale |
摘要 |
<p>An encoder configuration comprises a dual-modulation scale track pattern that provides a first intensity modulation component for producing periodic signals, and a second intensity modulation component for producing a long-range absolute signal. The dual-modulation scale track pattern increases the range-to-resolution ratio of the encoder without the use of additional scale tracks that would increase the width of the encoder components. The long-range signal may be encoded in the dual-modulation scale track pattern either by varying certain dimensions of pattern elements included in the scale track or by superimposing a layer including an optical density variation along on the track on pattern elements of similar areas. In either case, the net offset and/or amplitude levels of the associated signals are modified along the scale track. These modified offset and/or amplitude levels provide the basis for the long-range absolute signal.</p> |
申请公布号 |
EP2395328(A2) |
申请公布日期 |
2011.12.14 |
申请号 |
EP20110169039 |
申请日期 |
2011.06.08 |
申请人 |
MITUTOYO CORPORATION |
发明人 |
KAPNER, DANIEL JOHN;MILVICH, MICHELLE MARY |
分类号 |
G01D5/347;G01D5/244 |
主分类号 |
G01D5/347 |
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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