Photosensitive pressure alarm device for electric cleaning care appliances
US11641933B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 20, 2017 |
| Grant date | May 9, 2023 |
| Priority date | — |
| Expiry date | Jan 25, 2039 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61C2204/00
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A photosensitive pressure alarm device for electric cleaning care appliances comprises at least one light source, at least one photosensitive unit, a light reflecting surface, a detection circuit, and an alarm portion. The light source and the photosensitive unit are provided on a movable component or a movable component on a same side, and the light reflecting surface is provided on a stationary component or the movable component. Under the combined action of an external force (F1) and an elastic force (F2), the light reflecting surface or the light source and the photosensitive unit provided on the movable component can move with the movable component, and the incident angle and the reflection angle of the light on the light reflecting surface change, causing that the light receiving area of the photosensitive unit changes, and in turn resulting in change of the electrical performance of the photosensitive unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.