发明名称 |
LAGESENSOR. |
摘要 |
Contact lenses can be made by machining an inner concave surface into a plastics material blank, then mounting the blank in a lathe and machining the outer convex surface thereon. Repeated measurement with a micrometer is needed during the latter machining to ensure that the lens vertex is correctly formed. To avoid this, the sensor described herein comprises a laser source (12) from which radiation passes over a knife edge member (13) and the blank (10) to a detector (15), the items being arranged so that, when the lens has been correctly machined, a surface diffraction effect occurs leading to a detectable signal from the detector (15). The disclosed sensor apparatus could be used during manufacture of items other than contact lenses. |
申请公布号 |
DE3786034(D1) |
申请公布日期 |
1993.07.08 |
申请号 |
DE19873786034 |
申请日期 |
1987.02.11 |
申请人 |
BRITISH AEROSPACE PLC, FARNBOROUGH, HAMPSHIRE, GB |
发明人 |
HARRISON, ANDREW B., SIX HILLS WAY STEVENAGE HERTS. SG1 2AS, GB |
分类号 |
G01B11/24;(IPC1-7):G01B11/24;G02C13/00 |
主分类号 |
G01B11/24 |
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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