JP2006172576A - Disk device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disk device in which rotation of a motor is made stable and the motor can be operated for a long time even though the voltage of the battery of a power supply section is reduced to the condition in which the motor that rotates a disk can no longer rotate in a stable manner. <P>SOLUTION: In the constitution of the disk device, a spindle motor 5 rotates a disk 1, recorded compressed data are reproduced, the compressed data are intermittently written into a RAM13, the compressed data are read from the RAM13, extended, outputted and the rotation of the motor 5 is stopped during an interrupted interval of the intermittent writing into the RAM13. A voltage boosting section 33 is arranged to switch the electric power supply path in which power is directly supplied to a pick/motor drive circuit section 6 that drives the motor 5 from a power supply section 8 to the path which goes through a voltage boosting circuit 9 that boosts the output voltage of the battery 32. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a disk device that reproduces recorded information from, for example, an optical disk (including a magneto-optical disk) that is a recording medium and / or records information on an optical disk. The present invention relates to a portable disk device provided with

  Conventionally, portable devices generally use a battery such as a primary battery or a secondary battery as a power source, so how long continuous operation is possible with limited power supplied from the battery. It becomes an important point of development. For this reason, various measures to reduce the power consumption of devices have been considered. For example, the voltage of components used is reduced, the efficiency of power supply circuits is increased, unnecessary power is reduced by intermittent operation using the characteristics of compressed signals, and the battery voltage is directly reduced. Electric power efficiency by applying a motor has already been implemented.

  As a measure by intermittent operation using the characteristics of the compression signal, the average power consumption of the device is reduced by rotating the spindle motor for disk rotation at a speed higher than the normal rotation speed and increasing the ratio of the reading time and the rest period. It is designed to be illustrated. Further, as a countermeasure by applying the battery voltage directly to the motor, the battery voltage is directly applied to the motor to prevent the power efficiency from being lowered.

  For example, Patent Document 1 describes a disk reproducing apparatus that performs a countermeasure by intermittent operation using the characteristics of a compressed signal and a countermeasure by applying a direct motor of a battery voltage. In addition, the disc playback device constantly monitors the battery voltage during operation for the purpose of avoiding abnormal termination during use and notifying the user of the remaining battery level, and manages the voltage throughout the device and manages the battery. Marks are also displayed. In monitoring the battery voltage, the battery voltage is generally confirmed during servo operation in order to guarantee the operation of the device.

  However, the measure for increasing the disk rotation speed and increasing the ratio of the reading time and the pause period to save power causes the disk to rotate at a high speed, so that the power consumption itself during the high-speed rotation increases. For this reason, when the battery voltage decreases, the power saving effect is adversely affected. In addition, when the battery voltage is directly applied to the motor, the influence of the battery voltage drop appears more quickly, and the motor itself is not likely to rotate stably.

Therefore, in the disk reproducing apparatus of Patent Document 1, when the battery voltage falls below a certain value, the increase in the disk rotation speed is stopped and returned to the normal rotation speed so that it can be used up to a lower voltage.
JP 11-149716 A (released on June 2, 1999)

  However, in the case of the conventional disk reproducing apparatus described above, even if the speed increase of the disk rotation is stopped and the normal rotation speed is returned to enable the use of a lower voltage, the battery voltage is reduced to a region where the motor does not rotate stably. Decreases, the power that can be extracted from the battery is not improved, and the operation cannot be performed. In particular, it tends to occur in a primary battery having a large internal resistance, a motor having a high starting voltage, or a device having high power consumption.

  The present invention has been made in view of the above problems, and even when the battery voltage is lowered to a state where the motor does not rotate stably, a disk device capable of operating the motor more stably by rotating the motor stably. It is intended to provide.

  In order to solve the above problems, the disk device of the present invention rotates the disk with a motor to reproduce the compressed data recorded on the disk, and intermittently writes the reproduced compressed data to the memory while In a disk device that reads compressed data written from a memory, outputs the compressed data that has been read out after being decompressed, and stops rotation of the motor at least during a period of intermittent writing to the memory by a stopping means The voltage boosting means is provided for boosting the output voltage from the battery when the output voltage from the battery, which is a power source for driving the motor, is equal to or lower than a predetermined value.

  According to this, when the output voltage from the battery, which is a power source for driving the motor that rotates the disk, becomes equal to or lower than a predetermined value, the voltage boosting means, for example, through the voltage boosting circuit or the like, The output voltage is boosted.

  Therefore, even if the battery voltage drops to a state where the motor does not rotate stably, the motor can be rotated stably and the device can be operated for a longer time, and power saving can be achieved compared to the conventional system.

  In order to solve the above problems, the disk device of the present invention rotates the disk with a motor to reproduce the compressed data recorded on the disk, and intermittently writes the reproduced compressed data to the memory while In a disk device that reads compressed data written from a memory, outputs the compressed data that has been read out after being decompressed, and stops rotation of the motor at least during a period of intermittent writing to the memory by a stopping means When the compressed data recorded on the disk is reproduced, the motor has a high-speed rotation mode for rotating the motor at a higher speed than usual, and the output voltage from the battery as a power source for driving the motor is a predetermined value. Voltage boosting means for boosting the output voltage from the battery when the output voltage is below, the voltage boosting means By boosted, it is characterized in that the output voltage from the battery be not more than a predetermined value is continued the high speed rotation mode.

  According to this, by selecting the high-speed rotation mode, when reproducing the compressed data recorded on the disk, the disk rotating motor is rotated at a higher speed than usual, and the disk is stopped. Since the interruption period of reading from the device becomes longer, the average power consumption of the device can be reduced.

  In addition, when the output voltage from the battery, which is a power source for driving the motor that rotates the disk, becomes equal to or lower than a predetermined value, the voltage boosting means reduces the output voltage from the battery via, for example, a voltage boosting circuit. Even if the battery voltage drops to a state where the motor does not rotate stably, the motor can be stabilized and the high-speed rotation mode can be continued to operate the device for a longer time. Therefore, it is possible to save power than the conventional system.

  In order to solve the above problems, the disk device of the present invention writes the signal inputted from the outside into the memory once, and then writes it from the memory while compressing the data and writing it as compressed data to the memory. In the disk device that intermittently reads the compressed data, rotates the disk with a motor and records the data on the disk, a stop unit that stops at least the rotation of the motor during the intermittent recording period on the disk; A voltage boosting unit that boosts the output voltage from the battery when the output voltage from the battery, which is a power source for driving the motor, is equal to or less than a predetermined value is provided.

  According to this, when the output voltage from the battery, which is a power source for driving the motor that rotates the disk, becomes equal to or lower than a predetermined value, the voltage boosting means, for example, through the voltage boosting circuit or the like, The output voltage is boosted.

  Therefore, even if the battery voltage drops to a state where the motor does not rotate stably, the motor can be rotated stably and the device can be operated for a longer time, and power saving can be achieved compared to the conventional system.

  In order to solve the above problems, the disk device of the present invention writes the signal inputted from the outside into the memory once, and then writes it from the memory while compressing the data and writing it as compressed data to the memory. In a disk device that reads compressed data intermittently and rotates the disk with a motor and records it on the disk, the motor rotates the motor at a higher speed than usual when reproducing the compressed data recorded on the disk. And a voltage booster that boosts the output voltage from the battery when the output voltage from the battery that is a power source for driving the motor is equal to or lower than a predetermined value. By boosting the output voltage, even if the output voltage from the battery is below a predetermined value, the high-speed rotation mode It is characterized by being continuous.

  According to this, by selecting the high-speed rotation mode, when reproducing the compressed data recorded on the disk, the disk rotating motor is rotated at a higher speed than usual, and the disk is stopped. Since the interruption period of reading from the device becomes longer, the average power consumption of the device can be reduced.

  In addition, when the output voltage from the battery, which is a power source for driving the motor that rotates the disk, becomes equal to or lower than a predetermined value, the voltage boosting means reduces the output voltage from the battery via, for example, a voltage boosting circuit. Even if the battery voltage drops to a state where the motor does not rotate stably, the motor can be stabilized and the high-speed rotation mode can be continued to operate the device for a longer time. Therefore, it is possible to save power than the conventional system.

  As described above, the disk device according to the present invention boosts the output voltage from the battery when the output voltage from the battery, which is a power source for driving the motor that rotates the disk, is equal to or lower than a predetermined value. Even if the battery voltage drops to a state where the motor does not rotate stably, it is possible to operate the device for a longer time by rotating the motor stably, saving power compared to conventional systems. There is an effect that becomes possible.

  An embodiment of the present invention will be described below with reference to FIGS.

  First, the configuration of a disc playback apparatus according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram of a reproducing circuit mounted on the disk reproducing apparatus.

  This disc reproducing apparatus is configured to reproduce an audio signal (digital signal) recorded on the disc 1 from the disc 1 which is a recording medium on which information is recorded.

  As shown in FIG. 1, the reproduction circuit includes a first reproduction unit 30, a second reproduction unit 31, a voltage booster (voltage booster) 33, and a power supply unit 8.

  The first reproducing unit 30 reads information (compressed data, PCM signal) compressed and recorded on the disc 1 from the disc 1, and more specifically, the optical pickup 2, the RF unit 3, the signal processing unit 4, and the like. , A spindle motor 5, a pick / motor drive circuit section 6, and a system control circuit section 7.

  In the first reproducing unit 30, the disk 1 is rotated at a predetermined rotational speed by the spindle motor 5, and information compressed and recorded on the disk 1 is read out to the signal processing unit 4 through the RF unit 3 using the optical pickup 2. Based on the compressed data read by the signal processing unit 4, the system control circuit unit 7 outputs a control signal to the signal processing unit 4 and the pick / motor drive circuit unit 6 to perform servo control. The pick / motor drive circuit unit 6 drives the optical pickup 2 and the spindle motor 5 based on the control signal.

  The second reproducing unit 31 temporarily stores the compressed data reproduced by the first reproducing unit 30 in the RAM (memory) 13 and decompresses the compressed data (memory signal) read from the RAM 13 to convert it into an audio signal. Specifically, it includes an expansion unit 11, a RAM 13, an audio reproduction unit 14, and an external output unit 16.

  In the second reproduction unit 31, the compressed data read out to the signal processing unit 4 is temporarily stored in the RAM 13, and the stored data is read out again to decompress the data. Then, the audio reproduction unit 14 reproduces the audio using the decompressed data, and is output from the external output unit 16 as reproduction sound.

  Here, the compressed data reproduced by the first reproduction unit 30 is intermittently written to the RAM 13 by the second reproduction unit 31, while the compressed data written from the RAM 13 is read out at a speed slower than the writing speed, and the compressed data read out is read out. Output after decompressing the data.

  The system control circuit unit 7 utilizes at least the spindle motor during the intermittent writing interruption period (servo OFF period) to the RAM 13 by utilizing the time difference generated when the compressed and recorded information is decompressed and reproduced. 5 is stopped (stop means). In this apparatus, the optical pickup 2, the RF unit 3, the spindle motor 5, the pick / motor drive circuit unit 6, and a part of the signal processing unit 4 are stopped.

  A battery 32 is mounted on the power supply unit 8 as a power supply. Examples of the battery 32 include a primary battery that cannot be charged and a secondary battery that can be charged. The electric power from the power supply unit 8 is supplied to each component through each supply line (not shown). As described above, the voltage of the battery 32 is directly applied to the pick / motor drive circuit unit 6 in order to prevent a decrease in power supply efficiency.

  When the output voltage (battery voltage) of the battery 32 in the power supply unit 8 is equal to or lower than a predetermined value, the voltage boosting unit 33 sets the power supply path directly connected from the battery 32 to the pick / motor drive circuit unit 6 to the voltage Switching is performed so as to pass through the booster circuit 9. The voltage boosting unit 33 includes a system control circuit unit 7, a changeover switch 10, a voltage boosting circuit 9, and voltage dividing resistors R1 and R2.

  The voltage booster circuit 9 boosts the battery voltage supplied from the power supply unit 8, and the power supply path from the power supply unit 8 to the pick / motor drive circuit unit 6 depends on the switching state of the changeover switch (SW) 10. Either a direct path or a path performed via the voltage booster circuit 9 is used. Switching of the power supply path from the power supply unit 8 to the pick / motor drive circuit unit 6 is controlled by the system control circuit unit 7 as described later.

  The battery voltage supplied to the pick / motor drive circuit unit 6 is divided and supplied to the system control circuit unit 7 by the resistor R1 and the resistor R2, and based on the divided voltage. In addition, the system control circuit unit 7 can detect the battery voltage in the power supply unit 8.

  In addition to the above-described switching control of the power supply path, the system control circuit unit 7 measures against intermittent operation using the characteristics of the compressed signal in order to prevent the power supply efficiency from being lowered, that is, the disk 1 is operated at a speed higher than the normal rotation speed. By rotating at high speed and increasing the ratio between the reading time and the rest period, the average power consumption in this apparatus is reduced (high-speed rotation mode).

  Below, the various control which the system control circuit part 7 implements in order to operate this apparatus long using the electric power supplied from the battery 32 of the power supply part 8 is demonstrated.

  As described above, the system control circuit unit 7 stops the operation unnecessary portion of the first reproduction unit 30 during the servo OFF period in order to save power. Therefore, the current consumption and the battery voltage (output voltage from the battery) periodically change according to servo ON / servo OFF. FIG. 2 shows how the current consumption and the battery voltage periodically change according to servo ON (t1 time) / servo OFF (t2 time) during reproduction at steady speed rotation (normal rotation speed). Current consumption A1 when the servo is OFF and current consumption A2 when the servo is ON. The battery voltage V1 when the servo is OFF and the battery voltage V2 when the servo is ON. FIG. 3 shows how the current consumption and the battery voltage change periodically according to servo ON (t3 time) / OFF (t4 time) during reproduction at high speed. Current consumption A1 when the servo is OFF and current consumption A3 when the servo is ON. The battery voltage V1 when the servo is OFF and the battery voltage V3 when the servo is ON.

  As shown in FIGS. 2 and 3, power consumption increases and battery voltage decreases in both the steady-state rotation and the high-speed rotation as compared to the servo-on period and the servo-off period. However, as can be seen from a comparison between FIG. 2 and FIG. 3, when reproducing at high speed, the average power consumption of the device is certainly reduced, but the current consumption during the servo ON period is A3, and at the time of reproduction at steady speed rotation. It turns out that it becomes larger than A2. In other words, when the battery voltage is in the low voltage range, the device is quickly brought into an operation stop state, and the device is stopped at a high speed rotation while being operated at a steady speed rotation.

  In order to prevent such problems from occurring, in the conventional playback device, in the low voltage region where the battery voltage has dropped, the above power reduction measures are not taken by high-speed rotation (high-speed rotation mode stopped), and switching to steady-speed rotation is performed. I was trying to make it work longer. However, if the battery voltage is still in a low voltage region where the spindle motor does not rotate stably, the device will still stop.

  On the other hand, in the present disk reproducing apparatus, when the battery voltage becomes a predetermined voltage value or less, the system control circuit unit 7 keeps the speed of the spindle motor 5 at a high speed, and the pick / motor drive circuit from the power supply unit 8 is maintained. The supply path directly connected to the unit 6 is switched to a path via the voltage booster circuit 9. As a result, the output voltage from the battery is boosted, the spindle motor 5 again rotates stably, and the apparatus can be operated for a longer time while continuing the high-speed rotation mode.

  In FIG. 4, the voltage applied to the pick / motor drive circuit unit and the battery voltage in the system control circuit unit in the device of the conventional configuration in which power is always supplied directly from the power supply unit to the pick / motor drive circuit unit are detected. Indicates the detection voltage.

  As shown in FIG. 4, when a voltage V4 that is an end-to-end voltage determined as a device stop voltage is detected, the system control circuit unit stops the device. The end-to-end voltage is an operation end voltage set individually by the manufacturer, and is a voltage set as the battery life time.

  On the other hand, in FIG. 5, the power supply from the power supply unit 8 to the pick / motor drive circuit unit 6 is switched from direct supply to supply via the voltage booster circuit 9 according to the output voltage of the battery 32. The voltage applied to the pick / motor drive circuit unit 6 and the battery voltage detection voltage in the system control circuit unit 7 are shown.

  As shown in FIG. 5, when a predetermined voltage V3 higher than the voltage V4 defined as the device stop voltage in the conventional apparatus is detected, the system control circuit unit 7 starts the pick / motor drive circuit unit from the power supply unit 8. 6 is switched to the side through the voltage booster circuit 9. As a result, the voltage supplied to the pick / motor drive circuit unit 6 rises, the spindle motor 5 rotates, and the apparatus continues to operate.

  After that, when the operation continues and the battery voltage further decreases and reaches the voltage V5 that is the device stop voltage of the present apparatus, which is lower than the voltage V4 defined as the conventional device stop voltage, the system control circuit unit 7 stops the equipment. Here, the voltage V5 is set based on a limit numerical value that prevents the spindle motor 5 from rotating stably even if the voltage is boosted by the voltage booster circuit 9.

  As described above, the disk reproducing apparatus includes the voltage boosting unit 33. When the battery voltage drops and the spindle motor 5 does not rotate stably, the pick / motor drive circuit unit 6 is directly connected. By switching the connection destination of the power supply unit 8 included in the voltage booster circuit 9 to boost the voltage and then supplying it to the pick / motor drive circuit unit 6, the spindle motor 5 can be rotated even if the battery voltage remains unchanged. Even if it is lowered to such an extent that it cannot be performed, the apparatus can be operated for a longer time.

  In addition, by boosting the battery voltage by the voltage booster circuit 9, the spindle motor 5 rotating at a higher speed than usual can be continuously rotated at a high speed without dropping to a steady speed rotation, so that it is more effective. Power saving is possible.

  Here, although the high-speed rotation of the spindle motor 5 is continued even after the battery voltage is boosted by the voltage booster circuit 9, the above-described high-speed rotation is performed in the low voltage region where the conventional battery voltage is lowered. In combination with the power reduction measures by stopping the battery, when the battery voltage decreases, first, the high-speed rotation is stopped and switched to the steady-speed rotation to operate for a long time, and when the battery voltage further decreases, the voltage booster circuit 9 The battery voltage may be boosted. In addition, a configuration may be adopted in which the device is operated for a longer time only by steady-speed rotation only by boosting the battery voltage by the voltage booster circuit 9 without combining with power reduction measures by high-speed rotation.

  Furthermore, although the disk reproducing apparatus provided with the reproducing circuit is described here as the disk apparatus, the present invention is applied to a disk recording apparatus equipped with a recording circuit as shown in FIG. 6 or a disk recording / reproducing apparatus equipped with a recording / reproducing circuit. It is also possible to apply the configuration of the voltage booster 33.

  Here, FIG. 6 will be briefly described. For convenience of explanation, members having the same functions as those used in the description of the disk reproducing apparatus are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 6, the recording circuit includes a first recording unit 40, a second recording unit 41, a voltage booster (voltage booster) 33, and a power supply unit 8.

  The first recording unit 40 takes an external input signal such as voice input from the external input unit 17 into the voice recording unit 15, and then continuously writes it in the RAM 13 once, then compresses the data and compresses the data into the RAM 13 as compressed data. To store. The second recording unit 41 intermittently reads out the compressed data stored in the RAM 13 by the first recording unit 40, and uses the optical pickup 2 and the recording head circuit unit 18 as the disk 1 to read the disk 1 from the spindle motor. In step 5, recording is performed while rotating at a predetermined rotational speed.

  Again, since the compressed data is read out from the RAM 13 intermittently and recorded on the disk 1 as well, the system control circuit unit 7 suspends the writing to the disk 1 in the same manner as the reproducing circuit. At least during the servo OFF period, the rotation of the spindle motor 5 is stopped (stopping means). Specifically, the optical pickup 2, the RF unit 3, the spindle motor 5, the pick / motor drive circuit unit 6, the recording head circuit unit 18, and a part of the signal processing unit 4 are stopped.

  Various controls for operating the present apparatus for a long time using the power supplied from the battery 32 of the power supply unit 8 including the voltage boosting unit 33 in the system control circuit unit 7 have already been described in the reproduction circuit. Therefore, no further explanation will be given. However, since the recording device requires an operation such as updating the TOC area of the disc 1, the voltage V5, which is a device stop voltage, is equivalent to the device stop voltage V5 of the playback device that does not require updating the TOC region. Get higher.

  As mentioned above, although embodiment was illustrated and demonstrated about this invention, this invention can also be expressed as follows. That is, the first reproduction means for reproducing the information compressed and recorded on the disk at a predetermined rotational speed by a spindle motor, the memory for storing the signal reproduced by the first reproduction means, and the storage in the memory A playback device comprising: a second playback means for expanding the converted memory signal into an audio signal; and a stop means for stopping the rotation of the spindle motor of the first playback means when the first playback means is not operating. In addition, the reproducing apparatus uses a primary battery as a power source, and can rotate at a higher speed than a predetermined number of rotations of the motor so that the high-speed rotation is possible even when the voltage of the primary battery drops. In order to achieve this, it is characterized by comprising boosting means for the primary battery.

  The present invention also provides a first recording means (first recording section) for storing an external input signal after it is captured by an audio recording section and then compressed and stored in a memory, and a signal compressed and stored in a memory by the first recording section. The second recording means (second recording section) for recording the recording medium by rotating it with a spindle motor at a predetermined number of revolutions, and stopping the rotation of the spindle motor of at least the second recording means when the second recording means is not operating And a stopping device for squeezing, wherein a primary battery is used as a power source, and the motor is rotated at a higher speed than a predetermined number of revolutions of the motor, so that the high speed is maintained even when the voltage of the primary battery drops. In order to cope with the rotation, the primary battery is provided with a boosting means.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in the claims, and can be obtained by appropriately combining technical means disclosed in different embodiments. Embodiments are also included in the technical scope of the present invention.

  The present invention can be applied to a portable disk device that records / reproduces information with respect to an optical disk (including a magneto-optical disk) such as a reproduction-only CD (compact disk) or a recordable / reproducible MD (mini disk).

1, showing an embodiment of the present invention, is a block diagram of a reproducing circuit in a disk reproducing apparatus. FIG. It is explanatory drawing which shows a mode that a consumption current and a battery voltage change periodically according to the servo-on / servo-off at the time of reproduction | regeneration by steady-speed rotation (normal rotation speed). It is explanatory drawing which shows a mode that a consumption current and a battery voltage change periodically according to the servo-on / servo-off at the time of reproduction | regeneration at high speed rotation. It is explanatory drawing which shows the applied voltage to a pick / motor drive circuit part, and the detection voltage of a system control circuit part in the apparatus of the conventional structure which supplied the battery output directly and rotated the spindle motor. It is explanatory drawing which shows the applied voltage to a pick / motor drive circuit part, and the detection voltage of a system control circuit part in the said disk reproducing | regenerating apparatus which added the voltage booster part. 9 shows another embodiment of the present invention, and is a block diagram of a recording circuit in a disk recording apparatus. FIG.

Explanation of symbols

1 disc 5 spindle motor (motor)
6 Pick / motor drive circuit section 7 System control circuit section (stopping means, voltage boosting means)
8 Power supply section 9 Voltage booster circuit (Voltage booster)
10 changeover switch (voltage boosting means)
13 RAM (memory)
32 batteries

Claims (4)

Rotate the disc with a motor to reproduce the compressed data recorded on the disc, read the compressed data written from the memory while writing the reproduced compressed data intermittently to the memory, and expand the read compressed data In the disk device in which the rotation of the motor is stopped at least during the interruption period of intermittent writing to the memory by the stopping means.
A disk device comprising voltage boosting means for boosting the output voltage from the battery when the output voltage from the battery which is a power source for driving the motor is equal to or less than a predetermined value. Rotate the disc with a motor to reproduce the compressed data recorded on the disc, read the compressed data written from the memory while writing the reproduced compressed data intermittently to the memory, and expand the read compressed data In the disk device in which the rotation of the motor is stopped at least during the interruption period of intermittent writing to the memory by the stopping means.
In reproducing the compressed data recorded on the disc, the motor has a high-speed rotation mode for rotating the motor at a higher speed than usual.
Voltage boosting means for boosting the output voltage from the battery when the output voltage from the battery, which is a power source for driving the motor, is a predetermined value or less;
The disk device characterized in that the high-speed rotation mode is continued even when the output voltage from the battery is lower than a predetermined value by boosting the output voltage by the voltage boosting means. A signal input from the outside is once written continuously into the memory, then the compressed data is compressed and written to the memory as compressed data, and the compressed data written from the memory is read intermittently, and the disk is rotated by a motor. In the disk device for recording on the disk,
Stop means for stopping the rotation of the motor at least during the intermittent recording period on the disc;
A disk device comprising voltage boosting means for boosting the output voltage from the battery when the output voltage from the battery which is a power source for driving the motor is equal to or less than a predetermined value. While the signal input from the outside is once written continuously in the memory, then the compressed data is compressed and written to the memory as the compressed data, and the compressed data written from the memory is read intermittently, and the disk is rotated by the motor. In the disk device for recording on the disk,
In reproducing the compressed data recorded on the disc, the motor has a high-speed rotation mode for rotating the motor at a higher speed than usual.
Voltage boosting means for boosting the output voltage from the battery when the output voltage from the battery, which is a power source for driving the motor, is a predetermined value or less;
The disk device characterized in that the high-speed rotation mode is continued even when the output voltage from the battery is below a predetermined value by boosting the output voltage by the voltage boosting means.

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