Disk drive device
First Claim
1. A disk drive device for recording and/or reproducing information to and/or from an information recording disk and driven by a power supply voltage in a vehicle, said disk drive device comprising an engine start detecting part for detecting an engine start of the vehicle, said disk drive device being driven only after said engine start detecting part detects an engine start of said vehicle.
1 Assignment
0 Petitions
Accused Products
Abstract
A disk drive device in which emergency unloading at the start of the engine is prevented, a head may have a prolonged life and improved reliability as an HDD is achieved. A disk drive device is driven or the movement of a magnetic head is allowed after an engine start in a vehicle is detected by an engine start detecting part, so that emergency unloading can be prevented at the start of the engine. In order to detect the engine start, voltage values on four power supply lines for a vehicle power supply device are monitored or the outputs of various sensors such as a tachometer, a vibration detection sensor, an engine sound detection sensor, a vehicle speed pulse, a gyro sensor and a parking brake are monitored. In another embodiment, the number of emergency unloading occurrence at the start of the engine is reduced, which allows the head to have a prolonged life, so that the disk drive device has improved reliability as an HDD. The voltage values on two power supply lines, first and second power supply lines for a vehicle power supply device are monitored. The magnetic head is allowed to move when the voltage values on the first and second power supply lines attain a prescribed value after a prescribed time period after the voltage value on the first power supply line attains prescribed value.
27 Citations
25 Claims
- 1. A disk drive device for recording and/or reproducing information to and/or from an information recording disk and driven by a power supply voltage in a vehicle, said disk drive device comprising an engine start detecting part for detecting an engine start of the vehicle, said disk drive device being driven only after said engine start detecting part detects an engine start of said vehicle.
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14. A disk drive device for recording and/or reproducing information to and/or from an information recording disk and driven by a power supply voltage in a vehicle, said disk drive device comprising:
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a head for reading and/or writing information from and/or to the information recording disk;
a head driving part for giving driving instructions to said head;
an engine start detecting part for detecting an engine start of said vehicle; and
a head movement allowing part for allowing said head to be moved by instructions from said head driving part only after the engine start of the vehicle is detected by said engine start detecting part. - View Dependent Claims (15, 16)
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17. A disk drive device driven by a power supply voltage in a vehicle, said disk drive device comprising:
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a head for reading/writing information from/to a recording medium mounted to said disk drive device;
a head driving part for giving a driving instruction to said head;
a counter for starting a counting operation based on a prescribed signal related to a key switch in the vehicle; and
a head movement allowing part for allowing said head to be moved by the given driving instruction from said head driving part when said counter has counted a prescribed time period.
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18. A disk drive device driven by a power supply voltage in a vehicle, said disk drive device comprising:
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a counter for starting a counting operation based on a prescribed signal related to a key switch in the vehicle; and
a controller for driving said disk drive device when said counter has counted a first prescribed time period. - View Dependent Claims (19, 20, 21, 22, 23)
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24. A disk drive device for recording and/or reproducing information to and/or from an information recording disk and driven by a power supply voltage in a vehicle, said disk drive device comprising a sensor for detecting a vehicle condition indicative of an engine start of the vehicle, said disk drive device being driven only after said sensor detects the condition to indicate an engine start of the vehicle.
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25. A disk drive device driven by a power supply voltage in a vehicle, said disk drive device comprising:
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a power supply part for providing a power supply voltage to said disk drive device in response to operation of a key switch in the vehicle;
a counter for starting a counting operation to count a first prescribed time period after the power supply voltage from the power supply part is provided to said disk drive device;
a voltage value monitoring circuit for monitoring a voltage value at said power supply part; and
a controller responsive detection of a voltage value result by said voltage value monitoring circuit after said counter has counted the first prescribed time period, for controlling said counter to count a second prescribed time period when the voltage value is lower than a prescribed value, and for driving said disk drive device when said counter has counted the second prescribed time period.
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Specification