Laser Diode control method, laser Diode control device, and camcorder
First Claim
1. A laser diode control method used for a laser diode control device including a laser diode;
- a drive device for driving the laser diode by supplying current for laser light output, and a temperature sensor, the method comprising the steps of;
detecting temperature around the laser diode;
supplying current equivalent to a threshold current value of the laser diode to the laser diode if temperature detected by the temperature sensor is equal to or below a predetermined value of the laser diode; and
outputting laser light after a predetermined amount of time lapses.
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Accused Products
Abstract
A laser diode is controlled such that a writing operation can be performed readily even at a low temperature and equal to or below the operation guarantee temperature range of the laser diode. A laser diode control device includes a temperature sensor for detecting temperature of a laser diode. If a detected temperature by the temperature sensor is equal to or below the operation guarantee temperature range, a current equivalent to a threshold current value is supplied to the laser diode. After a predetermined time lapses, laser light is outputted to increase temperature of the laser diode to the operation guarantee temperature thereof. Finally, a writing operation is then carried out.
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Citations
5 Claims
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1. A laser diode control method used for a laser diode control device including a laser diode;
- a drive device for driving the laser diode by supplying current for laser light output, and a temperature sensor, the method comprising the steps of;
detecting temperature around the laser diode; supplying current equivalent to a threshold current value of the laser diode to the laser diode if temperature detected by the temperature sensor is equal to or below a predetermined value of the laser diode; and outputting laser light after a predetermined amount of time lapses.
- a drive device for driving the laser diode by supplying current for laser light output, and a temperature sensor, the method comprising the steps of;
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2. A laser diode control device, comprising:
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a laser diode; a drive device for driving the laser diode by supplying current for laser light output, the laser diode control device; a temperature sensor for detecting temperature around the laser diode; a memory for recording a threshold current value of the laser diode; and control means for supplying a threshold current corresponding to temperature by the driving device to the laser diode on the basis of a temperature detected by the temperature sensor, and supplying a current for laser beam output to the laser diode after verifying that the temperature detected by the temperature sensor reached an operation guarantee temperature of the laser diode. - View Dependent Claims (3)
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4. A camcorder, comprising:
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a laser diode control device having a laser diode and a drive device for driving the laser diode by supplying current for laser light output, so as to record acquired video data onto a recording medium through the laser diode control device, the camcorder further including; a temperature sensor for detecting temperature around the laser diode; a memory for recording a threshold current value of the laser diode; and control means for supplying a threshold current corresponding to temperature by the driving device to the laser diode on the basis of a temperature detected by the temperature sensor, and supplying a current for laser beam output to the laser diode after verifying that the temperature detected by the temperature sensor reached an operation guarantee temperature of the laser diode. - View Dependent Claims (5)
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Specification