Media and optical drive operating temperature control system and method

• US 5,566,077 A
• Filed: 06/07/1995
• Issued: 10/15/1996
• Est. Priority Date: 05/29/1992
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Kulakowski, John E., Means, Rodney J.
• Primary Examiner(s): Voeltz, Emanuel T.
• Assistant Examiner(s): CHOI, KYLE JAEHUN
• Application Number:
  US08/479,251
• Time in Patent Office: 496 Days
• Field of Search: 364/480, 364/184
• US Class Current: 700/299
• CPC Class Codes: G11B 11/10502 characterised by the transducing operation to be executed
• CPC Class Codes: G11B 11/10595 Control of operating function
• CPC Class Codes: G11B 19/02 Control of operating function, e.g. switching from recording to reproducing

Abstract

A control system for dynamically regulating an operating condition of a device used with and controlled by a host computer system. The inventive system includes a sensor arrangement for detecting the desired operating condition of the device and providing a signal in response thereto. A control system dynamically regulates the operation of the device in response to commands generated by the host system and the sensor output signal to maintain the operating condition of the device within predetermined parameters. In a particular implementation, the advantageous teachings of the present invention are incorporated in an optical drive system. One or more sensors are used to detect the operating temperature of the drive and provide an analog output signal in response thereto. The signal is digitized and input to a microprocessor based control circuit. When the temperature of the drive exceeds a first threshold, the control circuit dynamically adjusts the duty cycle of the drive by inhibiting high temperature write and erase operations. When the temperature of the drive exceeds a second threshold, the control circuit inhibits the lower temperature read and verify operations as well. As a result, the controller maintains the operating temperature of the drive within predetermined parameters which may be controlled by the user through the host computer.

Claims

1. In an optical disk drive having a plurality of internal heat-generating devices, a system for dynamically regulating an operating temperature of said drive, comprising:

sensor means for detecting said operating temperature of said drive and producing a sensor output signal representative of said operating temperature and,

control means responsive to said sensor output signal for inhibiting operation of at least a selected one but less than all of said internal heat-generating devices when said sensor output signal exceeds a first threshold level.

2. The system as set forth in claim 1 wherein said control means also functions to inhibit operation of at least an additional one of said internal heat-generating devices when said sensor output signal exceeds a second threshold level greater than said first threshold level.

3. The system as set forth in claim 2 wherein said sensor means includes:

a temperature sensor for detecting said operating temperature of said drive and generating an analog output signal representative of said operating temperature and

a digital-to-analog converter for converting said analog output signal to a digital temperature value representative of said operating temperature, said digital temperature value comprising said sensor output signal.

4. The system as set forth in claim 3 wherein said control means includes:

a microprocessor programmed to compare said digital temperature value to first and second digital threshold values representative of said first and second threshold levels, respectively, and to inhibit operation of said at least a selected one of said internal heat-generating devices in response to said digital temperature value being greater than said first digital threshold value, and to inhibit operation of said at least an additional one of said internal heat-generating devices in response to said digital temperature value being greater than said second digital threshold value.

5. The system as set forth in claim 4 wherein:

said optical disk drive is interfaced with a host computer and

said first and second digital threshold values are adjustable by said host computer.

6. The system as set forth in claim 2 wherein:

said optical disk drive is interfaced with a host computer and

said control means includes a microprocessor programmed to execute write, erase, read, and verify commands issued by said host computer and to return command-completion signals to said host computer upon completion of execution of said commands issued by said host computer;

wherein said microprocessor is responsive to said sensor output signal exceeding said first threshold level to delay returning said command-completion signal to said host computer upon completion of execution of a write or erase command, by a first prescribed time period, to thereby allow said disk drive to cool during said first prescribed time period; and

wherein said microprocessor is responsive to said second control signal to delay returning said command-completion signal to said host computer upon completion of execution of a read or verify command, by a second prescribed time period, to thereby allow said disk drive to cool during said second prescribed time period.

7. The system as set forth in claim 1 wherein said at least a selected one of said internal heat-generating devices includes a bias coil for producing a magnetic field for effecting a write or erase operation.

8. The system as set forth in claim 7 wherein said at least a selected one of said internal heat-generating devices further includes coarse and fine actuator coils of a positioning and focusing subsystem for focusing and controllably positioning a beam of radiation relative to an information-bearing surface of an optical storage medium.

9. The system as set forth in claim 8 wherein said at least an additional one of said internal heat-generating devices includes a laser.

10. The system as set forth in claim 7 wherein said at least an additional one of said internal heat-generating devices includes coarse and fine actuator coils of a positioning and focusing subsystem for focusing and controllably positioning a beam of radiation relative to an information-bearing surface of an optical storage medium.

11. The system as set forth in claim 7 wherein said at least an additional one of said internal heat-generating devices includes a laser.

12. The system as set forth in claim 11 wherein said at least an additional one of said internal heat-generating devices further includes coarse and fine actuator coils of a positioning and focusing subsystem for focusing and controllably positioning a beam of radiation relative to an information-bearing surface of an optical storage medium.

13. The system as set forth in claim 1 wherein said optical disk drive comprises a magneto-optic optical disk drive.

14. The system as set forth in claim 1 wherein said first threshold level is adjustable.

15. The system as set forth in claim 1 wherein said sensor means includes a first temperature sensor for detecting an ambient air temperature of said drive and a second temperature sensor for detecting a surface temperature of an optical disk loaded in said drive.

16. In a computer peripheral device, a system for dynamically regulating an operating temperature of said device comprising:

sensor means for detecting said operating temperature of said device and producing a sensor output signal representative of said operating temperature and

mode changing means for changing a mode of operation of said device from a normal mode of operation to a first heat dissipation mode of operation in which write and erase operations of said device are inhibited, but read and verify operations of said device are not inhibited, in response to said sensor output signal exceeding a first threshold level.

17. The system as set forth in claim 16 wherein said mode changing means is responsive to said sensor output signal exceeding a second threshold level greater than said first threshold level, for changing the mode of operation of said device from said first heat dissipation mode of operation to a second heat dissipation mode of operation in which said write, erase, read and verify operations are inhibited.

18. The system as set forth in claim 17 wherein said sensor means includes:

a temperature sensor for detecting said operating temperature of said drive and generating an analog output signal representative of said operating temperature and

a digital-to-analog converter for converting said analog output signal to a digital temperature value representative of said operating temperature, said digital temperature value comprising said sensor output signal.

19. The system as set forth in claim 18 wherein said mode changing means includes:

a microprocessor programmed to compare said digital temperature value to first and second digital threshold values representative of said first and second threshold levels, respectively, and to inhibit said write and erase operations of said drive in response to said digital temperature value being greater than said first digital threshold value, and to inhibit said read and verify operations of said drive in response to said digital temperature value being greater than said second digital threshold value.

20. The system as set forth in claim 19 wherein:

said optical disk drive is interfaced with a host computer and

said first and second digital threshold values are adjustable, by said host computer.

21. The system as set forth in claim 20 wherein said first and second threshold levels are adjustable.

22. The system as set forth in claim 17 wherein:

said optical disk drive is interfaced with a host computer and

said mode changing means includes a microprocessor programmed to execute write, erase, read, and verify commands issued by said host computer and to return command-completion signals to said host computer upon completion of execution of said commands issued by said host computer;

wherein said microprocessor is responsive to said sensor output signal exceeding said first threshold level to delay returning said command-completion signal to said host computer upon completion of execution of a write or erase command, by a first prescribed time period, to thereby allow said disk drive to cool during said first prescribed time period and

wherein said microprocessor is responsive to said second control signal to delay returning said command-completion signal to said host computer upon completion of execution of a read or verify command, by a second prescribed time period, to thereby allow said disk drive to cool during said second prescribed time period.

23. The system as set forth in claim 16 wherein said sensor means includes a first temperature sensor for detecting an ambient air temperature of said drive, and a second temperature sensor for detecting a surface temperature of an optical disk loaded in said drive.

24. In an optical disk drive having a plurality of internal heat-generating devices, a system for dynamically regulating an operating temperature of said drive, comprising:

a sensor for detecting said operating temperature of said drive and producing a sensor output signal representative of said operating temperature and

a control system responsive to said sensor output signal for inhibiting operation of at least a selected one but less than all of said internal heat-generating devices when said sensor output signal exceeds a first threshold level.

25. The system as set forth in claim 24 wherein said control system is further responsive to said sensor output signal for inhibiting operation of at least an additional one of said internal heat-generating devices when said sensor output signal exceeds a second threshold level greater than said first threshold level.

26. In a computer peripheral device, a system for dynamically regulating an operating temperature of said device comprising:

a sensor for detecting said operating temperature of said device and producing a sensor output signal representative of said operating temperature and

a mode changing system for changing a mode of operation of said device from a normal mode of operation to a first heat dissipation mode of operation in which write and erase operations of said device are inhibited, but read and verify operations of said device are not inhibited, in response to said sensor output signal exceeding a first threshold level.

27. The system as set forth in claim 26 wherein said mode changing system is responsive to said sensor output signal exceeding a second threshold level greater than said first threshold level for changing the mode of operation of said device from said first heat dissipation mode of operation to a second heat dissipation mode of operation in which said write, erase, read and verify operations are inhibited.

28. In a computer peripheral device, a method for dynamically regulating an operating temperature of said device comprising the steps of:

detecting said operating temperature of said device and producing a temperature-indication signal representative of said operating temperature and

changing a mode of operation of said device from a normal mode of operation to a first heat dissipation mode of operation in which write and erase operations of said device are inhibited, but read and verify operations of said device are not inhibited, in response to said temperature-indication signal exceeding a first threshold level.

29. The method as set forth in claim 28 further comprising the step of changing the mode of operation of said device from said first heat dissipation mode of operation to a second heat dissipation mode of operation in which said write, erase, read and verify operations are inhibited, in response to said temperature-indication signal exceeding a second threshold level greater than said first threshold level.

30. In an optical disk drive having a plurality of internal heat-generating devices, a method for dynamically regulating an operating temperature of said drive, comprising the steps of:

detecting said operating temperature of said drive and producing a temperature-indication signal representative of said operating temperature; and

,

inhibiting operation of at least a selected one but less than all of said internal heat-generating devices when said temperature-indication signal exceeds a first threshold level.

31. The method as set forth in claim 30 further comprising the step of inhibiting operation of at least an additional one of said internal heat-generating devices when said temperature-indication signal exceeds a second threshold level greater than said first threshold level.