Laser diode control method, laser diode control device, and information recording/playback apparatus
Even though a laser diode is within the operation guarantee temperature range, the rise time characteristics required to protect and maintain the writing quality right away may not be present at a lower temperature. By sufficiently increasing the rise time, a laser diode control method of the present invention makes it possible to write readily. A laser diode control device includes a temperature sensor for detecting temperature of a laser diode. When a detected temperature by the temperature sensor is equal to or below a predetermined value within the operation guarantee temperature range, a seek motor controls the position of a pickup to move the pickup to a region outside a recording region of a recording medium. In this way, a current exceeding a threshold current value is supplied to the laser diode, and the writing operation starts after the laser diode temperature is increased up to a level where the rise time characteristics required to protect and maintain the writing quality is present.
1. A laser diode control method used for a laser diode control device comprising:
a laser diode;
a drive device for supplying a current to the laser diode to drive the same;
a pickup having the laser diode, an objective lens, objective lens moving means for changing a focus position of the objective lens, and a case for accommodating the elements;
pickup moving means for moving the pickup to a predetermined radiating position;
a temperature sensor for detecting temperature around the laser diode;
a semiconductor memory and/or a hard disc device, and
a controller,
wherein, if temperature detected by the temperature sensor is equal to or below a predetermined value and if a pickup radiating position is located within a recording region on a recording medium, the controller controls the objective lens moving means to set a focus position of a laser beam being radiated to the recording medium to a position outside a recording layer of the recording medium; the controller controls the pickup moving means to move the pickup outside the recording region of the recording medium; and the controller controls the drive device to supply a current exceeding a threshold value to the laser diode, thereby outputting a laser beam,
wherein, if the pickup is moved to a position outside the recording region of the recording medium, the controller controls the objective lens moving means to set a focus position of a laser beam being radiated to the recording medium to a position on an extension line of a recording layer of the recording medium, and the controller controls the drive device to supply a current exceeding a threshold value to the laser diode, thereby outputting a laser beam,
wherein, if temperature detected by the temperature sensor is equal to or below a predetermined value, the laser diode control device does not record audio and/or video onto the recording medium, but records audio and/or video onto the semiconductor memory and/or the hard disc device.
2. A laser diode control method used for a laser diode control device comprising:
a laser diode;
a drive device for supplying a current to the laser diode to drive the same;
a pickup having the laser diode, an objective lens, objective lens moving means for changing a focus position of the objective lens, and a case for accommodating the elements;
pickup moving means for moving the pickup to a predetermined radiating position;
a temperature sensor for detecting temperature around the laser diode;
a semiconductor memory and/or a hard disc device, and
a controller,
wherein, if temperature detected by the temperature sensor is equal to or below a predetermined value and if a pickup radiating position is located within a recording region on a recording medium, the controller controls the pickup moving means to move the pickup outside the recording region of the recording medium; and the controller controls the drive device to supply a current equal to or below a threshold value to the laser diode, thereby outputting no laser beam,
wherein, if the pickup is moved to a position outside the recording region of the recording medium, the controller controls the objective lens moving means to set a focus position of a laser beam being radiated to the recording medium to a position on an extension line of a recording layer of the recording medium, and the controller controls the drive device to supply a current exceeding a threshold value to the laser diode, thereby outputting a laser beam,
wherein, if temperature detected by the temperature sensor is equal to or below a predetermined value, the laser diode control device does not record audio and/or video onto the recording medium, but records audio and/or video onto the semiconductor memory and/or the hard disc device.
3. An information recording/playback device including an optical disc device for recording or playing back, under control of a laser diode control device, at least one of video and audio onto or from a recording medium, the device comprising:
a laser diode;
a drive device for supplying a current to the laser diode to drive the same;
a pickup having the laser diode, an objective lens, objective lens moving means for changing a focus position of the objective lens, and a case for accommodating the elements;
pickup moving means for moving the pickup to a predetermined radiating position;
a temperature sensor for detecting temperature around the laser diode;
a semiconductor memory and/or a hard disc device, and
a controller,
wherein, under control of the controller, the laser diode control device controls the pickup moving means to move the pickup outside a recording region of a recording medium if temperature detected by the temperature sensor is equal to or below a predetermined value,
the laser diode control device controls the drive device to supply a current exceeding a threshold value to the laser diode,
the laser diode control device controls the pickup moving means to move the pickup to a predetermined recording position of the recording medium if temperature detected by the temperature sensor exceeds a predetermined value, and
the laser diode control device records data to or reads data from the recording medium,
wherein, if temperature detected by the temperature sensor is equal to or below a predetermined value, the laser diode control device compares spinup time of the hard disc device with preheating time of the laser diode,
if the spinup time of the hard disc device is shorter than the preheating time of the laser diode, the laser diode control device starts spinup of the hard disc device and does not record audio and/or video on the recording medium until preheating processing of the laser diode ends, but records audio and/or video onto the semiconductor memory and/or the hard disc device,
if the preheating time of the laser diode is shorter than the spinup time of the hard disc device, the laser diode control device starts the preheating processing on the laser diode but does not perform spinup of the hard disc device, and the laser diode control device records audio and/video on the recording medium after the preheating processing of the laser diode ends.
4. The information recording/playback device according to one of claim 3 ,
wherein, if the pickup is moved to a position outside the recording region of the recording medium, the laser diode control device additionally controls the objective lens moving means to set a focus position of a laser beam being radiated to the recording medium to a position on an extension line of a recording layer of the recording medium, and
the laser diode control device controls the drive device to supply a current exceeding a threshold value to the laser diode, thereby outputting a laser beam from the laser diode.
5. The information recording/playback device according to one of claim 4 wherein, if temperature detected by the temperature sensor is equal to or below a predetermined value, the laser diode control device does not record audio and/or video onto the recording medium, but records audio and/or video onto the semiconductor memory and/or the hard disc device.
6. The information recording/playback device according to one of claim 3 wherein, if temperature detected by the temperature sensor is equal to or below a predetermined value, the laser diode control device does not record audio and/or video onto the recording medium, but records audio and/or video onto the semiconductor memory and/or the hard disc device.
7. An information recording/playback device including an optical disc device for recording or playing back, under control of a laser diode control device, at least one of video and audio onto or from a recording medium, the device comprising:
a laser diode;
a drive device for supplying a current to the laser diode to drive the same;
a pickup having the laser diode, an objective lens, objective lens moving means for changing a focus position of the objective lens, and a case for accommodating the elements;
pickup moving means for moving the pickup to a predetermined radiating position;
a temperature sensor for detecting temperature around the laser diode;
a semiconductor memory and/or a hard disc device, and
a controller,
wherein, under control of the controller, the laser diode control device controls the objective lens moving means to set a focus position of a laser beam being radiated to the recording medium to a position outside a recording layer of the recording medium if temperature detected by the temperature sensor is equal to or below a predetermined value and if a pickup radiating position is located within a recording region on a recording medium,
the laser diode control device controls the drive device to supply a current exceeding a threshold value to the laser diode, thereby outputting a laser beam from the laser diode,
the laser diode control device controls the pickup moving means to move the pickup to a predetermined recording position of the recording medium if temperature detected by the temperature sensor exceeds a predetermined value, and
the laser diode control device records data to or reads data from the recording medium,
wherein, if temperature detected by the temperature sensor is equal to or below a predetermined value, the laser diode control device compares spinup time of the hard disc device with preheating time of the laser diode,
if the spinup time of the hard disc device is shorter than the preheating time of the laser diode, the laser diode control device starts spinup of the hard disc device and does not record audio and/or video on the recording medium until preheating processing of the laser diode ends, but records audio and/or video onto the semiconductor memory and/or the hard disc device,
if the preheating time of the laser diode is shorter than the spinup time of the hard disc device, the laser diode control device starts the preheating processing on the laser diode but does not perform spinup of the hard disc device, and the laser diode control device records audio and/video on the recording medium after the preheating processing of the laser diode ends.
8. The information recording/playback device according to one of claim 7 wherein, if temperature detected by the temperature sensor is equal to or below a predetermined value, the laser diode control device does not record audio and/or video onto the recording medium, but records audio and/or video onto the semiconductor memory and/or the hard disc device.
9. An information recording/playback device including an optical disc device for recording or playing back, under control of a laser diode control device, at least one of video and audio onto or from a recording medium, the device comprising:
a laser diode;
a drive device for supplying a current to the laser diode to drive the same;
a pickup having the laser diode, an objective lens, objective lens moving means for changing a focus position of the objective lens, and a case for accommodating the elements;
pickup moving means for moving the pickup to a predetermined radiating position;
a temperature sensor for detecting temperature around the laser diode;
a semiconductor memory and/or a hard disc device, and
a controller,
wherein, under control of the controller, the laser diode control device controls the objective lens moving means to set a focus position of a laser beam being radiated to the recording medium to a position outside a recording layer of the recording medium if temperature detected by the temperature sensor is equal to or below a predetermined value and if a pickup radiating position is located within a recording region on a recording medium, and
the laser diode control device controls the drive device to supply a current exceeding a threshold value to the laser diode, thereby outputting a laser beam while controlling the pickup moving means to move the pickup to a position outside a recording region of the recording medium,
wherein, if temperature detected by the temperature sensor is equal to or below a predetermined value, the laser diode control device compares spinup time of the hard disc device with preheating time of the laser diode,
if the spinup time of the hard disc device is shorter than the preheating time of the laser diode, the laser diode control device starts spinup of the hard disc device and does not record audio and/or video on the recording medium until preheating processing of the laser diode ends, but records audio and/or video onto the semiconductor memory and/or the hard disc device,
if the preheating time of the laser diode is shorter than the spinup time of the hard disc device, the laser diode control device starts the preheating processing on the laser diode but does not perform spinup of the hard disc device, and the laser diode control device records audio and/video on the recording medium after the preheating processing of the laser diode ends.
10. The information recording/playback device according to one of claim 9 ,
wherein, if the pickup is moved to a position outside the recording region of the recording medium, the laser diode control device additionally controls the objective lens moving means to set a focus position of a laser beam being radiated to the recording medium to a position on an extension line of a recording layer of the recording medium, and
the laser diode control device controls the drive device to supply a current exceeding a threshold value to the laser diode, thereby outputting a laser beam from the laser diode.
11. The information recording/playback device according to one of claim 10 wherein, if temperature detected by the temperature sensor is equal to or below a predetermined value, the laser diode control device does not record audio and/or video onto the recording medium, but records audio and/or video onto the semiconductor memory and/or the hard disc device.
12. The information recording/playback device according to one of claim 9 wherein, if temperature detected by the temperature sensor is equal to or below a predetermined value, the laser diode control device does not record audio and/or video onto the recording medium, but records audio and/or video onto the semiconductor memory and/or the hard disc device.
13. An information recording/playback device including an optical disc device for recording or playing back, under control of a laser diode control device, at least one of video and audio onto or from a recording medium, the device comprising:
a laser diode;
a drive device for supplying a current to the laser diode to drive the same;
a pickup having the laser diode, an objective lens, objective lens moving means for changing a focus position of the objective lens, and a case for accommodating the elements;
pickup moving means for moving the pickup to a predetermined radiating position;
a temperature sensor for detecting temperature around the laser diode;
a semiconductor memory and/or a hard disc device, and
a controller,
wherein, under control of the controller, if temperature detected by the temperature sensor is equal to or below a predetermined value and if a pickup radiating position is located within a recording region on a recording medium, the laser diode control device controls the drive device to supply a current equal to or below a threshold value to the laser diode, thereby not outputting a laser beam while controlling the pickup moving means to move the pickup outside a recording region of the recording medium,
wherein, if temperature detected by the temperature sensor is equal to or below a predetermined value, the laser diode control device compares spinup time of the hard disc device with preheating time of the laser diode,
if the spinup time of the hard disc device is shorter than the preheating time of the laser diode, the laser diode control device starts spinup of the hard disc device and does not record audio and/or video on the recording medium until preheating processing of the laser diode ends, but records audio and/or video onto the semiconductor memory and/or the hard disc device,
if the preheating time of the laser diode is shorter than the spinup time of the hard disc device, the laser diode control device starts the preheating processing on the laser diode but does not perform spinup of the hard disc device, and the laser diode control device records audio and/video on the recording medium after the preheating processing of the laser diode ends.
14. The information recording/playback device according to one of claim 13 ,
wherein, if the pickup is moved to a position outside the recording region of the recording medium, the laser diode control device additionally controls the objective lens moving means to set a focus position of a laser beam being radiated to the recording medium to a position on an extension line of a recording layer of the recording medium, and
the laser diode control device controls the drive device to supply a current exceeding a threshold value to the laser diode, thereby outputting a laser beam from the laser diode.
15. The information recording/playback device according to one of claim 14 wherein, if temperature detected by the temperature sensor is equal to or below a predetermined value, the laser diode control device does not record audio and/or video onto the recording medium, but records audio and/or video onto the semiconductor memory and/or the hard disc device.
16. The information recording/playback device according to one of claim 13 wherein, if temperature detected by the temperature sensor is equal to or below a predetermined value, the laser diode control device does not record audio and/or video onto the recording medium, but records audio and/or video onto the semiconductor memory and/or the hard disc device.