Current driving system of light emitting diode
US6665551B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 20, 2000 |
| Grant date | Dec 16, 2003 |
| Priority date | — |
| Expiry date | May 30, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/14551
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Three current supply lines 44, 45, 41 and connection terminals 32, 34, 30 thereof for respectively driving the light emitting diodes on the probe side are arranged in a light emitting diode driving circuit on the measurement apparatus body side, a pair of driving switches Sw1A, Sw1B and Sw2A, Sw2B for constant current having contact points to be switched to the electric power source side or the ground side are respectively connected with the two current supply lines 44, 45 among the three current supply lines, and switching operation signal supply lines 41A, 42A and 41B, 42B are arranged for successively and continuously driving the light emitting diodes by supplying a switching operation signal for switching the contact points on the electric power source side or on the ground side to the pair of driving switches for constant current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.