发明名称 |
Monitoring system for a predetermined field of view |
摘要 |
A lift control system includes a spatial filter for producing a signal having various features, a discriminator for discriminating one or more features of the signal, and for producing a control signal when at least one of the features discriminated falls in a predetermined range, and active devices connected to the discriminator. The spatial filter is defined by a semi-spherical bowl having a plurality of openings or by a poly-face prism which is made from a plano-convex lens with its curved face so polished or cut as to have a plurality of flat faces.
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申请公布号 |
US4554459(A) |
申请公布日期 |
1985.11.19 |
申请号 |
US19810331089 |
申请日期 |
1981.12.15 |
申请人 |
FUJITEC CO., LTD. |
发明人 |
TSUTSUMI, SUTEO;KOH, HIROSHI |
分类号 |
G08B17/12;B66B5/00;G01N21/84;G01N21/88;G01V8/12;G01V8/14;G08B13/18;G08B13/193;G08B19/00;G08B21/00;G08B21/22;G08B23/00;G08B25/04;(IPC1-7):G02B13/18 |
主分类号 |
G08B17/12 |
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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