Power source control apparatus for laser diode
First Claim
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1. A power source control apparatus for a laser diode, comprising:
- a laser diode having an anode and a cathode;
a switching element connected in parallel between said anode and said cathode of said laser diode, said switching element having a forward voltage drop lower than a forward voltage drop of said laser diode;
a shorting circuit that turns said switching element on so as to short-circuit said anode and cathode of said laser diode when said shorting circuit receives no laser output command signal for making said laser diode output a laser beam, said shorting circuit turning said switching element off so as to make said laser diode output the laser beam when said shorting circuit receives said laser output command signal; and
,a constant current source circuit that supplies current to the laser diode, the current being switched to one of said laser diode and said switching element by said shorting circuit.
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Abstract
A power source control apparatus has a constant current circuit and plural laser diodes. Switching elements are connected in parallel between anodes and cathodes of the laser diodes. Forward voltage drop of the switching elements is set lower than forward voltage drop of the laser diodes. When constant current output from the constant current circuit flows through the laser diodes, the switching element either short-circuits or opens the anode and cathode of the laser diode. Thus, current path is switched vise versa.
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Citations
10 Claims
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1. A power source control apparatus for a laser diode, comprising:
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a laser diode having an anode and a cathode; a switching element connected in parallel between said anode and said cathode of said laser diode, said switching element having a forward voltage drop lower than a forward voltage drop of said laser diode; a shorting circuit that turns said switching element on so as to short-circuit said anode and cathode of said laser diode when said shorting circuit receives no laser output command signal for making said laser diode output a laser beam, said shorting circuit turning said switching element off so as to make said laser diode output the laser beam when said shorting circuit receives said laser output command signal; and
,a constant current source circuit that supplies current to the laser diode, the current being switched to one of said laser diode and said switching element by said shorting circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A power source control apparatus for a laser diode, comprising:
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a laser diode; a switching element connected in parallel between an anode and a cathode of said laser diode; a driver circuit driving said laser diode, said driver circuit comprising a constant current source circuit that supplies current to said laser diode, the current being switched to one of said laser diode and said switching element; and a cooler made by assembling metal plates; wherein said laser diode, said switching element and said driver circuit are mounted on said cooler.
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9. A power source control apparatus comprising:
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a laser diode; a switching element connected in parallel between an anode and a cathode of said laser diode; a driver circuit driving said laser diode; and a cooler made by assembling metal plates, said cooler defining one electrode; wherein said laser diode, said switching element and said driver circuit are mounted on said cooler; and wherein said laser diode and said switching element have one ends electrically and mechanically connected to said cooler; and wherein another electrode is disposed between said laser diode and said switching element, said another electrode being insulated from said cooler; and wherein said laser diode and said switching element have another ends electrically connected to said another electrode; and wherein a drive control circuit is disposed on said cooler to drive and control said switching element and said laser diode.
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10. A power source control apparatus comprising:
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a laser diode; a switching element connected in parallel between an anode and a cathode of said laser diode; a driver circuit driving said laser diode; a cooler made by assembling metal plates; and
,a coolng pipe circulating cooling water therein, said cooling water flowing in said cooling pipe so as to cool said cooler; wherein said laser diode, said switching element and said driver circuit are mounted on said cooler.
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Specification