发明名称 |
Automatic aperture size measurement apparatus and process |
摘要 |
Apparatus for automatically measuring aperture size of a slotted apertured material includes a means for supporting and transporting a slotted apertured material having a plurality of slots with each having a longitudinal axis and a comparator mask overlaying the apertured material and having alternate light transparent and opaque sectors, a light source and a light detector disposed on opposite sides of the slotted apertured material and having a light beam directed therethrough wherein a rhombic-shaped aperture controls the size and shape of the light beam impinging the detector whereby advancement of the rhombic-shaped aperture along a diagonal axis provides a reduced rate of change in light transmitted by the slots and received by the light detector whereby fluctuations in light transmission are reduced for random variations in mask placement.
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申请公布号 |
US4379635(A) |
申请公布日期 |
1983.04.12 |
申请号 |
US19810251833 |
申请日期 |
1981.04.07 |
申请人 |
GTE LABORATORIES INCORPORATED |
发明人 |
MCCOLL, JAMES R. |
分类号 |
G01B11/02;(IPC1-7):G01B11/02 |
主分类号 |
G01B11/02 |
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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