Vibrating alert device
US6774769B2 · kind B2 · utility
Assignees
Inventor
Key dates
| Filing date | May 23, 2002 |
| Grant date | Aug 10, 2004 |
| Priority date | — |
| Expiry date | May 23, 2022 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB06B2201/70
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A vibrating alert device not startling the user by its vibration and able to improve the effectiveness of the alert, provided with a vibration strength control circuit becoming active for a duration of an incoming call signal and repeatedly gradually increasing a drive voltage supplied to the vibrating motor in stages from a minimum vibration strength voltage to a maximum vibration strength voltage, the vibration control circuit having a resistance type voltage division circuit which generates different vibration strength voltages from a minimum voltage strength voltage to a maximum voltage strength and a voltage switching circuit for selecting and outputting in a rising order the vibration strength voltages for each constant time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.