Current driving system of light emitting diode
First Claim
1. A current driving system of a light emitting diode comprising:
- an apparatus for measuring a concentration of light absorbing material in a living tissue, the apparatus including;
a probe adapted to be attached to a living tissue, the probe having a light emitting section having at least two light emitting diodes emitting lights of different wavelengths, the probe further having a light receiving section defined by a photo-diode for receiving light emitted from the light emitting section after being transmitted through the living tissue;
a measurement apparatus body, attached with the probe, for calculating the concentration of light absorbing material in the living tissue, said at least two light emitting diodes being successively and continuously driven by a light emitting diode driving circuit arranged in the measurement apparatus body;
three current supply lines and connection terminals thereof for respectively driving said at least two light emitting diodes;
a first pair of driving switches connected to a first of the three current supply lines, a first switch among the first pair having contact points switched to an electric power source and a second switch among the first pair switched to a ground;
a second pair of driving switches connected to a second of the three current supply lines, a first switch among the second pair having contact points switched to the electric power source and the second switch among the second pair switched to the ground;
and switching operation signal supply lines arranged for successively and continuously driving the light emitting diodes by supplying switching operation signals to the first and second pair of driving switches, wherein the driving switches and the signal supply line is disposed inside the measurement apparatus body.
1 Assignment
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Accused Products
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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Citations
24 Claims
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1. A current driving system of a light emitting diode comprising:
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an apparatus for measuring a concentration of light absorbing material in a living tissue, the apparatus including;
a probe adapted to be attached to a living tissue, the probe having a light emitting section having at least two light emitting diodes emitting lights of different wavelengths, the probe further having a light receiving section defined by a photo-diode for receiving light emitted from the light emitting section after being transmitted through the living tissue;
a measurement apparatus body, attached with the probe, for calculating the concentration of light absorbing material in the living tissue, said at least two light emitting diodes being successively and continuously driven by a light emitting diode driving circuit arranged in the measurement apparatus body;
three current supply lines and connection terminals thereof for respectively driving said at least two light emitting diodes;
a first pair of driving switches connected to a first of the three current supply lines, a first switch among the first pair having contact points switched to an electric power source and a second switch among the first pair switched to a ground;
a second pair of driving switches connected to a second of the three current supply lines, a first switch among the second pair having contact points switched to the electric power source and the second switch among the second pair switched to the ground;
and switching operation signal supply lines arranged for successively and continuously driving the light emitting diodes by supplying switching operation signals to the first and second pair of driving switches, wherein the driving switches and the signal supply line is disposed inside the measurement apparatus body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A current driving system of a light emitting diode comprising:
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an apparatus for measuring a concentration of light absorbing material in a living tissue, the apparatus including;
a measurement apparatus body, capable of attaching with a probe, for calculating the concentration of light absorbing material in the living tissue, a light emitting diode driving circuit arranged in the measurement apparatus body, the light emitting diode circuit being capable of continuously and successively driving at least two light emitting diodes in the probe;
three current supply lines and connection terminals thereof for respectively driving said at least two light emitting diodes;
a first pair of driving switches connected to a first of the three current supply lines, a first switch among the first pair having contact points switched to an electric power source and a second switch among the first pair switched to a ground;
a second pair of driving switches connected to a second of the three current supply lines, a first switch among the second pair having contact points switched to the electric power source and the second switch among the second pair switched to the ground; and
switching operation signal supply lines arranged for successively and continuously driving the light emitting diodes by supplying switching operation signals to the first and second pair of driving switches, wherein the driving switches and the signal supply line are disposed inside the measurement apparatus body. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification