Flow rate transducer
US4389902A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 23, 1981 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | Apr 23, 2001 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/075
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a flow rate transducer of the type arranged to detect the rotational speed of a blade wheel by transmitting a light beam from one side thereof to the other, a printed circuit board for carrying thereon a light-emitting element and a light-receiving element is provided. The light-emitting element and the light-receiving element are received in recessed portions of a casing made of a transparent material, where all parts including the printed circuit board contained in the casing are fixedly supported by a synthetic resin filling. The optical axes of the light-emitting element and the light-receiving element can be readily adjusted to align before assembled in the casing. The size and shape of the recessed portions may be arranged to correspond to the size and shape of the corresponding light-emitting element and the light-receiving element so that optical axes alignment can be automatically performed when fitted therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.