Drive Circuit and Drive Method for Semiconductor Light Source
AssigneeCanon Kabushiki Kaisha
InventorHajime Motoyama
Life of this patent
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Abstract
A circuit for driving a semiconductor laser including a semiconductor integrated circuit, which controls the drive of the semiconductor laser, and is connected to one end of the semiconductor laser. Moreover, the driving circuit incorporates a first power source +Vcc that supplies by way of the semiconductor integrated circuit a drive voltage to one end of the semiconductor laser and a second power source −Vcc, which is connected to the other end of the semiconductor laser and supplies a drive voltage to the other end. Furthermore, the drive circuit incorporates a voltage clamp circuit, connected to a connection terminal connecting the semiconductor laser and the semiconductor integrated circuit, for adjusting the electric potential of the connection terminal.
Claims11
A circuit for driving a semiconductor laser, comprising:
- an integrated semiconductor circuit to control the drive of the semiconductor laser, which is connected to one end of the semiconductor laser;
- a first power source for supplying a drive voltage to the one end of the semiconductor laser via the semiconductor integrated circuit;
- a second power source, connected to the other end of the semiconductor laser, supplying a drive voltage to the other end;
- and
- a voltage clamp circuit, connected to a connection terminal connecting the semiconductor laser and the semiconductor integrated circuit, for adjusting the electric potential of the connection terminal.
A circuit for driving a semiconductor laser, comprising:
- a semiconductor integrated circuit to control the driving of the semiconductor laser, which is connected to one end of the semiconductor laser;
- a first power source for supplying a drive voltage to a connection terminal connecting the semiconductor laser and the semiconductor integrated circuit;
- a second power source, connected to the other end of the semiconductor laser, for supplying a drive voltage to the other end;
- and
- a voltage clamp circuit, connected between the connection terminal and the first power source, for adjusting the electric potential of the connection terminal.
A method for driving a semiconductor laser, comprising the steps of:
- supplying a first drive voltage to one end of the semiconductor laservia a semiconductor integrated circuit which controls the drive of the semiconductor laser;
- supplying a second drive voltage to the other end of the semiconductor laser;
- and
- adjusting the electric potential of a connection terminal connecting the semiconductor laser and the semiconductor integrated circuit, by means of a voltage clamp circuit.
A method for driving a semiconductor laser, comprising the steps of:
- supplying a first drive voltage to a connection terminal connecting the semiconductor laser and a semiconductor integrated circuit which controls the drive of the semiconductor laser;
- supplying the second drive voltage to the terminal opposite to the connection terminal, of the semiconductor laser;
- and
- adjusting the electric potential of the connection terminal, by means of a voltage clamp circuit connected between the connection terminal and the first power source.
A drive circuit for driving a semiconductor laser, comprising:
- a semiconductor integrated circuit, for controlling the drive of the semiconductor laser, which is connected to one end of a light-sensitive device for receiving monitoring light emitted from a light emitting device included in the semiconductor laser;
- and
- a first voltage clamp circuit, connected to a first connection terminal connecting the light-sensitive device and the semiconductor integrated circuit, for adjusting the electric potential of the first connection terminal.
Dependencies are inferred from the claim text.