Method of manufacturing a liquid droplet spray device and such spray device
US8020973B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2002 |
| Grant date | Sep 20, 2011 |
| Priority date | — |
| Expiry date | Nov 23, 2022 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M15/025
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention concerns a liquid droplet spray device for atomising a liquid substance, Its housing consists of a at least a first substrate (15), a space (12) within the housing for containing the supplied liquid substance, an outlet means arranged in the first substrate (15) and comprising at least one outlet nozzle (19) and at least one output channel (20), said output channel (20) having straight side-walls, and a vibrating element (18) for vibrating the liquid so as to eject it. According to the present invention, each output channel (20) has a stepped shape having a lower portion (20a) and an upper portion (20b), the lower portion being arranged adjacent the space (12) and being of larger diameter than the upper portion (20b). The outlet nozzle (19) of each output channel is straight and does not show notching effects. The invention also concerns a method of manufacturing such device using a differential etching technique to obtain the stepped shape output channel without notching effects on the outlet nozzle.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.