发明名称 |
APPARATUS AND METHOD FOR DISPENSING SMALL QUANTITIES OF PARTICLES |
摘要 |
There is disclosed an apparatus and method which is capable of dispensing very small (typically less than 5 mg) quantities of particles to a high accuracy in a repeatable way and without undue wastage. Also, the need for advanced particle formulation is reduced. The apparatus comprises a closed loop control system which uses an electro-mechanical actuator to deliver impact energy to a supply of particles initially held on a sieve in a hopper. The impact energy causes a small number of particles to fall through the sieve and onto a weight measuring balance. The weight obtained is scrutinised by a processor to see if further actuations are required. In preferred embodiments, the energy of actuation is varied in accordance with the rate of dispensation calculated by the processor. Also, a correction amount can be obtained to take account of the fact that the balance can take a considerable amount of time to settle to its final value.
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申请公布号 |
US2008142277(A1) |
申请公布日期 |
2008.06.19 |
申请号 |
US20080035037 |
申请日期 |
2008.02.21 |
申请人 |
POWDERJECT RESEARCH LIMITED |
发明人 |
MACMICHAEL BRUCE;WESTLAND DUNCAN |
分类号 |
G01G19/00;G01G13/06;G01G15/02 |
主分类号 |
G01G19/00 |
代理机构 |
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代理人 |
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主权项 |
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