Current driving system of light emitting diode
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United States of America Patent
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-
Dec 16, 2003
Grant Date -
N/A
app pub date -
Nov 20, 2000
filing date -
Nov 19, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
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.
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