JP4562946B2 - Disk unit - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention uses a pickup to write information to a disk-shaped recording medium (hereinafter referred to as “disk”) such as an optical disk, a magnetic disk, or a magneto-optical disk, and to use the disk device to read information from the disk. In particular, the present invention relates to a disk device that can cool a pickup.
[0002]
[Prior art]
In recent years, there has been an increasing demand for power saving of disk devices from the viewpoint of making devices portable or protecting the environment. Among the factors that increase the power consumption of the disk device, a large weight is the power consumed by a motor (disk motor) for rotating the disk.
[0003]
In order to reduce the power consumption of the disk motor, it is a major point to reduce the load (windage loss) of the air flow generated when the disk is rotated. When the disk is rotated, the surrounding air moves while being dragged by the rotation of the disk, so that an air flow is generated in the vicinity of the disk surface, and the rotating disk receives air resistance. Actually, there is a disc runout or a disc motor runout, and the disc rotates while slightly swinging up and down, so the air resistance received by the disc increases. When the disk that rotates in this way receives a load from the surrounding air (or air flow), the disk motor is also loaded, thereby increasing the power consumption of the disk motor. Therefore, in order to reduce the power consumption of the disk motor, it is important to reduce the windage loss experienced by the disk during disk rotation. In order to reduce the windage loss, for example, it is effective to reduce the rotational speed (rotational speed) of the disk.
[0004]
As a method of reducing the rotational speed of the disk as much as possible without impairing the performance of the device such as the data transfer speed as much as possible, a technique of controlling the rotational speed of the disk by CLV (Constant Linear Velocity) is known. In the CLV control, when data recording / reproduction is executed in the outer peripheral area of the disc, the rotational speed of the disc is relatively small, and when data recording / reproduction is executed in the inner peripheral area of the disc. Has a relatively high disc rotation speed. The CLV control is used in an apparatus for continuous recording / reproducing applications with little seek operation, such as a reproducing apparatus for a music CD, for example. Also, the DVD-RAM recording / reproducing apparatus employs ZCLV (zone CLV) control that changes the number of revolutions of the disc in association with a plurality of zones that are defined on the disc surface and have different distances from the disc center. ing. By using these methods, a recording / reproducing operation can be executed at a predetermined data transfer speed at any position on the disk, and at a minimum number of rotations necessary to obtain a predetermined data transfer speed. Since the disk is rotated, the power consumption of the disk motor can be reduced.
[0005]
In the disk device, when there is no recording / playback operation (that is, when idling), there is little direct influence on the performance of the device, so it shifts to the sleep mode (low power consumption mode) and suppresses power consumption. It is generally done. Japanese Patent Application Laid-Open No. 8-255409 describes a technique for efficiently reducing the power consumption of a disk motor by reducing the rotational speed of the disk motor in two stages in the sleep mode. In this way, if the rotational speed of the disk motor is reduced when the recording / reproducing operation is not performed, the power consumption of the disk device can be reduced.
[0006]
As a technique for reducing windage damage to a rotating disk, Japanese Patent Application Laid-Open No. 11-185414 describes a technique for transferring a head (pickup) in the disk outer peripheral direction when information reading / writing operation is not performed. Has been. According to the above publication, the airflow associated with the rotation of the disk is less disturbed when the head is positioned on the outer peripheral side of the disk than when the head is positioned on the inner peripheral side, and the windage loss can be reduced. The power consumption of the disk motor can be reduced.
[0007]
Hereinafter, a conventional magnetic disk device described in Japanese Patent Laid-Open No. 11-185414 will be described with reference to FIG. FIG. 12 shows a head disk assembly (hereinafter referred to as “HDA”) of the magnetic disk device 100 in which the magnetic disk 101 is mounted. A magnetic disk 101 as a recording medium is fixed to a rotating portion of a spindle motor 102 by a disk clamp 103, and rotates when the spindle motor 102 is driven to rotate.
[0008]
The magnetic disk device 100 includes a magnetic head 104 for reading / writing information from / to the magnetic disk 101. The magnetic head 104 is rotatably fixed to the pivot 106 via the head arm 105, and the head arm 105 is driven using a voice coil motor 112 including a coil unit 107 and a magnetic circuit 108, whereby a magnetic disk is obtained. 101 can be transported along a substantially radial direction. The spindle motor 102, the pivot 106, and the magnetic circuit 108 are fixed to the base 109.
[0009]
The magnetic disk device 100 drives the spindle motor 102 to rotate the magnetic disk 101 counterclockwise. As the disk 101 rotates, the magnetic disk device 100 rotates in the direction of rotation of the magnetic disk 101 as indicated by the arrows in the figure. A corresponding air flow 110 is generated.
[0010]
While the disk is rotating, the magnetic head 104 moves on the disk surface of the magnetic disk 101 from the outer peripheral side to the inner peripheral side as necessary by rotating the head arm 105 around the pivot 106. When the magnetic head 104 is near the outer periphery of the magnetic disk 101, the gimbal 111 and the head arm 105 are positioned outside the magnetic disk 101. In this case, since the passage of the air flow 110 that moves accompanying the magnetic disk 101 is not blocked by the gimbal 111 and the head arm 105, the windage loss is reduced.
[0011]
On the other hand, when the magnetic head 104 is on the inner peripheral side of the magnetic disk 101, the magnetic head 104, the gimbal 111, and the head arm 105 are located inside the magnetic disk 101, so The passage becomes narrower. For this reason, as a result of the turbulence in the air flow, the windage loss with respect to the rotation of the magnetic disk 101 increases, and the power consumption of the disk device increases.
[0012]
The operations of the magnetic head 104, the spindle motor 102, the voice coil motor 112 for moving the magnetic head 104, and the like are controlled by a host device (not shown). The host device outputs a signal for controlling operations of the head 104 and the spindle motor 102 in order to record information on the disk 101 or reproduce information from the disk 101. When the magnetic disk device 100 receives a read command (read command) from the host device, the magnetic head 104 performs a seek operation to the target track and performs a read operation on the target track.
[0013]
In the magnetic disk device 100, the magnetic head 104 is located inside a predetermined position of the magnetic disk 101 (for example, a position separated from the center of the disk by a distance of two-thirds of the disk radius) after the end of the read operation. In some cases, when the next command (command or command) is not given from the host device within a time arbitrarily specified in advance, the magnetic head 104 is moved outward from a predetermined position of the magnetic disk 101. At this time, the power consumption of the spindle motor 102 can be effectively reduced by moving the magnetic head 104 in the outer circumferential direction of the disk as much as possible. Further, in order to further increase the effect of reducing power consumption, even when the magnetic head 104 is located outside a predetermined position of the magnetic disk 101 after the operation of the read command or the like is finished, it is assumed that the magnetic head 104 is located further outside. The position of the magnetic head 104 is controlled.
[0014]
As described above, when the read / write operation is not performed, the windage loss at the time of rotating the disk can be reduced by moving the head away from the center of the disk, thereby reducing the power consumption of the disk device. It is possible.
[0015]
[Problems to be solved by the invention]
However, when the power consumption of the disk device is reduced as described above, there is a problem that the temperature of the pickup (head) is likely to rise. If the disk rotation speed is lowered or the pickup is moved toward the outer periphery of the disk to reduce the turbulence of the air flow, the air flow around the pickup generated with the rotation of the disk is reduced and the air cooling effect of the pickup is reduced. Because.
[0016]
If the pickup exceeds the allowable temperature, the pickup performance deteriorates and the service life is shortened, and the writing operation and the reading operation cannot be performed appropriately. In particular, in an optical disk apparatus that reads and writes information using laser light, a laser diode driver (hereinafter also referred to as LDD) or a laser diode unit (hereinafter referred to as LDU) provided in a pickup for emitting laser light. Temperature) may rise to very high temperatures. LDU greatly reduces its performance due to overheating. Therefore, it has been extremely important to prevent the pickup temperature from rising. For this reason, in the conventional disk device, the inside of the disk device is often air-cooled using a cooling fan or the like.
[0017]
As described above, when the windage loss during the rotation of the disk is reduced in order to reduce the power consumption of the disk device, there is a problem that the pickup is likely to be overheated. It has been difficult to achieve both prevention of rise.
[0018]
The present invention has been made in view of the above points, and an object of the present invention is to provide a disk device capable of preventing overheating of the pickup while reducing power consumption of the disk device as much as possible.
[0019]
[Means for Solving the Problems]
The disk device of the present invention includes a motor that rotates a disk-shaped recording medium, a pickup that writes at least information to the recording medium, or reads information from the recording medium, and the recording A rotation controller that controls the rotation speed (rotation speed) of the medium and an overheat detector that detects an overheat state of the pickup, and cools the pickup by using an air flow generated by the rotation of the recording medium. In the disk device, when the overheat detector detects an overheat state of the pickup, the rotation controller increases the number of rotations of the recording medium, thereby improving the efficiency of cooling the pickup Execute.
[0020]
The disk device of the present invention includes a motor that rotates a disk-shaped recording medium, a pickup that writes at least information to the recording medium, or reads information from the recording medium, and the recording A transfer device that moves the pickup between the rotation center of the medium and the outer periphery of the recording medium, and an overheat detector that detects an overheat state of the pickup, and uses an air flow generated by the rotation of the recording medium And when the overheat detector detects an overheated state of the pickup, the transfer device moves the pickup so as to approach the rotation center of the recording medium. Thus, an operation for improving the efficiency of cooling the pickup is executed.
[0021]
In a preferred embodiment, the overheat detector includes a temperature measuring device that measures the temperature of the pickup.
[0022]
In a preferred embodiment, the overheat detector includes a rotation speed detector that detects the rotation speed of the recording medium, and detects an overheat state of the pickup based on an output of the rotation speed detector.
[0023]
In a preferred embodiment, the overheat detector further includes a time measuring device that measures a period during which the rotation speed of the recording medium is within a predetermined rotation speed range, and using the rotation speed detector and the time measuring apparatus, Detects an overheating condition of the pickup.
[0024]
In a preferred embodiment, the overheat detector includes a position detector that detects a position of the pickup, and detects an overheat state of the pickup based on an output of the position detector.
[0025]
In a preferred embodiment, the overheat detector further includes a timing device that measures a period during which the position of the pickup is within a predetermined position range, and the pickup is overheated using the position detector and the timing device. Is detected.
[0026]
In a preferred embodiment, the image forming apparatus further includes a cartridge detector that determines whether or not the recording medium is connected to the motor while being accommodated in the cartridge.
[0027]
In a preferred embodiment, when the cartridge detector determines that the recording medium is connected to the motor in a state of being accommodated in a cartridge, an operation for improving the cooling efficiency of the pickup is performed, and When the cartridge detector determines that the recording medium is not accommodated in the cartridge and is connected to the motor, the operation for improving the cooling efficiency of the pickup is not executed.
[0028]
In a preferred embodiment, when the pickup does not receive a control signal from a host device that controls an operation of the pickup to record information on the recording medium or an operation of the pickup to reproduce information from the recording medium. An operation for improving the cooling efficiency of the pickup is executed.
[0029]
In a preferred embodiment, the overheat detector includes a position detector that detects a position of the pickup, and the recording medium is rotated while being accommodated in a cartridge having an opening. A heat generating portion, and when the position detector determines that the position of the heat generating portion in the pickup is outside the opening of the cartridge, the transfer device moves the pickup to the recording medium. Move it closer to the center of rotation.
[0030]
In a preferred embodiment, the heat generating part is a laser device.
[0031]
In a preferred embodiment, when the overheat detector detects overheating of the pickup, the transfer device moves the pickup to the vicinity of the position closest to the rotation center of the recording medium within a range in which the pickup can move. Move to.
[0032]
In a preferred embodiment, the recording medium includes a recording / reproducing area in which information can be recorded or reproduced, and when the overheat detector detects overheating of the pickup, the transfer device includes the pickup Is moved to the vicinity of the position closest to the rotation center of the recording medium in the recording / reproducing area of the recording medium.
[0033]
The disk device of the present invention includes a motor that rotates a disk-shaped recording medium, a pickup that writes at least information to the recording medium, or reads information from the recording medium, and the recording A transfer device for moving the pickup between the rotation center of the medium and the outer periphery of the recording medium; a rotation controller for controlling the number of rotations of the recording medium according to the position of the pickup; and an overheating of the pickup An overheat detector for detecting a state, and a disk device that cools the pickup using an air flow generated by rotation of the recording medium, where the overheat detector detects an overheat state of the pickup, The transfer device moves the pickup so as to approach the rotation center of the recording medium, and the rotation control. There increases the rotational speed of the recording medium, thereby, improve the efficiency of cooling the pickup.
[0034]
The disk device of the present invention includes a motor that rotates a disk-shaped recording medium, a pickup that writes at least information to the recording medium, or reads information from the recording medium, and the recording A rotation controller that controls the rotation speed of the medium; a transfer device that moves the pickup between the rotation center of the rotating recording medium and the outer periphery of the recording medium; and an overheat detection that detects an overheated state of the pickup. A disk device that cools the pickup using an air flow generated by rotation of the recording medium, and the air flow is detected when the overheat detector detects an overheat state of the pickup. Increase the efficiency of cooling the pickup.
[0035]
In this specification, the term “pickup” refers to moving relative to the disk surface while facing the disk in order to write or read information to / from the disk. It means a device provided to be able to. In this specification, the pickup may be a write-only, read-only, and write-read pickup, and includes, for example, an optical element, a magnetic element, an electric circuit, and the like. In the case of an optical disk device, a pickup (optical pickup) amplifies a laser diode unit that emits laser light, a laser diode driver that drives the laser diode unit, and a current signal obtained by receiving and converting reflected light from the disk. A head amplifier for converting the voltage signal is provided. In the case of a magnetic disk device, the pickup includes a magnetic head that performs at least one of generation of a magnetic field and detection of a magnetic field, a head amplifier that amplifies an electric signal obtained from the detected magnetic field, and the like.
[0036]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an optical disk apparatus that performs recording / reproduction with respect to a DVD-RAM disk will be described as a disk apparatus according to an embodiment of the present invention with reference to the drawings. However, the disk device of the present invention is not limited to this, and may include an optical disk device, a magneto-optical disk device, and the like that perform reproduction with respect to a reproduction-only optical disk such as a CD-ROM and a DVD-ROM.
[0037]
(Embodiment 1)
FIG. 1 shows a configuration of an optical disc apparatus according to the first embodiment. The optical disk apparatus 1 stores a DVD-RAM disk 2 in the apparatus using a loading mechanism (not shown), and records / reproduces information on the DVD-RAM disk 2.
[0038]
Hereinafter, before explaining the configuration of the optical disc apparatus 1, the DVD-RAM disc 2 will be explained with reference to FIG. As shown in FIG. 11, the DVD-RAM disk 2 is provided with a user area R1 capable of recording / reproducing with a capacity of 4.7 GB on one side. The user area R1 is divided into 35 zones, and is defined as zone 0 (Z0) to zone 34 (Z34) in order from the inner circumference side of the disc. The DVD-RAM disk 2 is rotated under ZCLV control, and the optical disk apparatus 1 changes the rotation speed of the DVD-RAM disk 2 (that is, the rotation speed of the disk motor) for each zone. For example, the rotational speed of the disk motor is set to 3246.0 r / min (rotation frequency 54.10 Hz) in the 0 zone of the innermost circumference and 1335.2 r / min (rotation frequency 22.92 Hz) in the 34 zones of the outermost circumference. ing. Note that physical block addresses (hereinafter referred to as “PBA”) are sequentially assigned to the DVD-RAM disk 2 from the innermost periphery to the outer periphery of the disk. PBA31000h is allocated to the innermost peripheral edge of the user area R1 of the DVD-RAM disk 2. The h described at the end of the 31000h indicates that the preceding 31000 is a hexadecimal number.
[0039]
Refer to FIG. 1 again. The optical disk device 1 includes a disk motor 3 for rotating the DVD-RAM disk 2. The DVD-RAM disk 2 is fixed on a turntable 3 a fixed to the rotor of the disk motor 3.
[0040]
In the present embodiment, the disk motor 3 is provided with a hall element for measuring a magnetic change accompanying the rotation of the motor 3. The hall element outputs a rotation detection signal of 6 pulses / circumference as the disk motor 3 rotates. If this rotation detection signal is detected, the rotation speed of the disk motor 3 (that is, the rotation speed of the disk 2) can be detected. The rotation speed of the disk motor 3 may be detected by other known methods.
[0041]
The disk device 1 also includes a pickup 4 for recording / reproducing information by irradiating the recording / reproducing surface of the DVD-RAM disk 2 with a laser beam. The pickup 4 is a laser device including a laser diode unit (LDU) that generates laser light, a laser diode driver (LDD) that drives the LDU, and a current signal obtained by converting reflected light from the disk. A head amplifier that amplifies and converts this into a voltage signal is provided. Note that in this specification, the “laser device” widely includes optical elements, electric circuits, and the like used for generating laser light.
[0042]
The laser device and head amplifier provided in the pickup 4 can generate heat during the recording / reproducing operation. This may cause the pickup 4 to be in an overheated state (that is, a state exceeding a predetermined temperature). In particular, it is not preferable that the temperature of the LDU rises. For this reason, in this embodiment, as will be described later, the temperature of the LDU is controlled to be equal to or lower than the allowable temperature Ta.
[0043]
A thermistor 5 is provided in the vicinity of the LDU of the pickup 4. The thermistor 5 is a semiconductor element that has a small heat capacity and greatly changes its resistance value with respect to temperature changes. By utilizing this property, the thermistor 5 is used as a temperature measuring device for detecting the temperature of the LDU. In this specification, the temperature of an element (for example, LDD or LDU) constituting the pickup may be referred to as “pickup temperature”.
[0044]
The optical disk device 1 also includes a transfer device 6 for transferring the pickup 4 along the radial direction of the DVD-RAM disk 2. The transfer device 6 is configured by using a stepping motor 6 a provided with a lead screw 6 b, and the lead screw 6 b and the spiral portion 4 a provided on the pickup 4 are engaged with each other. A guide shaft 6c extending along the radial direction of the DVD-RAM disk 2 is fitted into the pickup 4, and the pickup 4 is transferred in the radial direction of the DVD-RAM disk 2 by rotating the lead screw 6b. Can do. Further, the stepping motor 6a is provided with an encoder (not shown), and the number of rotations of the stepping motor 6a or the transfer amount of the pickup 4 can be detected based on the output of the encoder.
[0045]
The transfer device 6 may have various configurations as long as the pickup 4 can be moved between the rotation center P of the disc 2 and the outer peripheral portion of the disc 2.
[0046]
The optical disc apparatus 1 includes a host controller 13. The host controller 13 includes a CPU, DSP, RAM, ROM, and the like, and controls the disk motor 3 and the transfer device 6 based on programs and data stored in advance in the ROM. The host controller 13 includes interface control means 11 for exchanging commands or data with the host 12, disk motor control means 7, transfer control means 8, temperature conversion means 9, and timing means 10.
[0047]
The disk motor control means 7 controls and drives the disk motor 3. The disk motor control means 7 also has a function of detecting the number of rotations of the disk motor 3 from a rotation detection signal output from a hall element provided in the disk motor 3.
[0048]
The transfer control means 8 controls and drives the transfer device 6 to transfer the pickup 4 to a target position. As described above, addresses are assigned to the surface of the disk 2 from the inner circumference side of the disk to the outer circumference side of the disk. Therefore, the position of the pickup 4 can be represented by an address read from the disk 2 by the pickup 4. In this specification, the address read from the disk by the pickup 4 may be referred to as “the address of the pickup 4”, and is used to indicate the position of the pickup 4. The transfer control means 8 also has a function of detecting the rotation speed of the stepping motor 6a (or the transfer amount of the pickup 4) from the encoder output of the stepping motor 6a.
[0049]
The temperature conversion means 9 detects the temperature of the pickup 4 by converting the output of the thermistor 5 into temperature data. Since the relationship between the resistance value and the temperature of the thermistor 5 is determined in advance, the temperature of the pickup 4 can be obtained by calculating the output information of the thermistor 5. As described above, in the present embodiment, the temperature of the laser diode unit is measured particularly in the pickup 4. This is because the performance of the laser diode unit is likely to deteriorate due to overheating, so it is important to control the temperature of the laser diode unit below a predetermined temperature.
[0050]
The time measuring means 10 provided in the host controller 13 can measure the time interval (period) by using, for example, an operation clock of the CPU. The time measuring means 10 can measure the elapsed time from the time when the reset signal is received from the disk motor control means 7 or the transfer control means 8.
[0051]
In addition, the disk device 1 of the present embodiment exchanges commands with the host (higher-order device) 12 connected to the outside of the optical disk device 1 via the interface control means 11 provided in the higher-order controller 13. Or data transfer.
[0052]
Next, the operation of the optical disc apparatus 1 of the present embodiment will be described with reference to FIG. Hereinafter, a case will be described in which an overheat state of the pickup is detected after the recording / reproducing operation (read / write) is completed and before shifting to the sleep mode.
[0053]
First, after the recording / reproducing operation is completed, the time measuring means 10 resets the timer (S1) and starts measuring the elapsed time thereafter. Next, it is determined whether or not the elapsed time is equal to or longer than a predetermined time (in this embodiment, 10 seconds) (S2). When it is determined in the process S2 that the elapsed time is less than 10 seconds, the process S2 is executed until it reaches 10 seconds or more. As described above, in this embodiment, the transition to the sleep mode, which will be described later, is prohibited until 10 seconds elapse after the recording / reproducing operation is completed. During this period, when the optical disc apparatus 1 receives a command for performing a recording / reproducing operation from the host 12, the optical disc apparatus 1 can quickly execute the recording / reproducing operation based on the command.
[0054]
If it is determined in process S2 that 10 seconds or more have elapsed since the completion of the recording / reproducing operation, the temperature converting means 9 detects the temperature T of the pickup 4 from the output of the thermistor 5 (S3). Thereafter, the temperature T of the pickup 4 detected in the process S3 is compared with a predetermined allowable temperature Ta (S4).
[0055]
In process S4, when the temperature T is less than the allowable temperature Ta (T <Ta), it is determined that the pickup 4 is not in an overheated state. In this case, the operation for cooling the pickup 4 is not performed, and the mode shifts to the sleep mode (S5). In the sleep mode, the following two controls are performed.
[0056]
First, the disk rotational speed is set to the lowest rotational speed among the rotational speeds preset in the optical disk apparatus 1. Here, since the rotational speed of the DVD-RAM disc is ZCLV-controlled, the minimum rotational speed of the disc is the rotational speed when the recording / reproducing operation is performed for the zone (34 zone) located on the outermost periphery side of the disc. Corresponding to Specifically, the optical disk apparatus 1 controls the disk motor 3 to rotate the disk at a rotational speed of 135.2 r / min corresponding to 34 zones.
[0057]
Second, the pickup 4 is transferred to the 34 zone which is the outermost peripheral zone of the DVD-RAM disk 2. The 34 zone is within the radial position range of 56.787 mm to 57.889 mm, which is near the outermost periphery, with respect to the radius of 60 mm of the DVD-RAM disk 2.
[0058]
Thus, in the sleep mode, the power consumption of the disk motor 3 can be reduced by reducing the rotational speed of the DVD-RAM disk 2. Furthermore, by positioning the pickup 4 on the outer periphery side of the disk, it is possible to reduce the windage loss when the disk rotates, so that the power consumption of the disk motor 3 can be further reduced.
[0059]
After shifting to the sleep mode in the process S5, the process returns to the process S3 again, and the temperature T of the pickup is detected. The purpose of this is to monitor whether the temperature T of the pickup does not exceed the allowable temperature Ta due to a malfunction or an increase in the ambient temperature of the apparatus after shifting to the sleep mode. If T <Ta is satisfied again in step S4, the sleep mode is maintained.
[0060]
If it is determined in step S4 that the temperature T of the pickup is equal to or higher than the allowable temperature Ta (T ≧ Ta), an operation for improving the cooling efficiency of the pickup 4 is performed.
[0061]
In this operation, first, it is determined whether or not the address of the pickup 4 is in the 0 zone (S6). The zero zone is the innermost zone of the disc in the user area, and is within a radial position range of 24.101 mm to 24.964 mm from the center of the DVD-RAM disc 2. Under ZCLV control, when the address of the pickup 4 is in the 0 zone, the rotational speed of the disc is set to 3246.0 r / min, which is the maximum rotational speed.
[0062]
If it is determined in step S6 that the address of the pickup 4 is not within the 0 zone, it is determined that the pickup 4 can be transferred to the inner circumferential side of the disk, and the pickup 4 is moved to the inner zone. The pickup 4 is cooled by performing an operation of transferring to (S7). Here, the following two controls are performed.
[0063]
First, one pickup 4 is transferred to the inner peripheral zone using the transfer device 6. For example, when the address of the pickup 4 is in the 34 zone, it is transferred to one 33 zone on the inner circumference side. The radial position range of the 34 zone is 56.787 mm to 57.889 mm, whereas the 33 zone is 55.823 mm to 56.787 mm on the inner peripheral side. If the pickup 4 is moved so as to approach the rotation center P of the disk 2 in this way, the area of the pickup 4 that is exposed to the wind generated by the rotation of the disk 2 increases, so that the efficiency of cooling the pickup 4 is improved. improves.
[0064]
Secondly, the disk motor 3 is controlled to increase the disk rotational speed to a higher rotational speed (in this embodiment, the rotational speed corresponding to the transfer destination zone). For example, the predetermined number of revolutions in the 34th zone is 1375.2r / min (rotation cycle 22.92Hz), whereas in the 33th zone, it is as large as 1399.2r / min (rotation cycle 23.32Hz). Such an increase in the number of rotations of the disk increases the amount of wind generated with the rotation of the disk, so that the efficiency of cooling the pickup 4 is improved.
[0065]
Even if the cooling efficiency of the pickup 4 is improved by the process S7, the temperature of the pickup 4 does not decrease immediately, and there is a time lag (time shift) until the temperature of the pickup 4 actually decreases. Therefore, a 1 minute wait (waiting time) is added as a period for cooling the pickup 4 (S8). Thereafter, the process returns to the process S3 again, and the temperature T of the pickup 4 is measured again. In the process S4, a comparison with the allowable temperature Ta is performed.
[0066]
Here, when the temperature T of the pickup 4 is lowered to a temperature lower than the allowable temperature Ta, the optical disc apparatus 1 shifts to the sleep mode (S5), thereby reducing the power consumption of the optical disc apparatus.
[0067]
On the other hand, when the temperature T of the pickup 4 is equal to or higher than the allowable temperature Ta, the pickup 4 is further transferred to the inner peripheral side and the number of rotations of the disk is further increased in the same manner as described above. The flow further improves the efficiency of cooling the pickup 4 (S6 to S8). Such a process is repeated until the temperature T of the pickup 4 becomes lower than the predetermined allowable temperature Ta. After the temperature T of the pickup 4 becomes lower than the predetermined allowable temperature Ta, the process shifts to the sleep mode (S5). Thus, power consumption can be reduced.
[0068]
When the address of the pickup 4 is in the 0 zone in the process S6, a temperature error is output and the series of processes is terminated (S9). This is a process performed for the purpose of protecting the LDU when the disk device is used by mistake in a high temperature environment which is not originally assumed.
[0069]
FIG. 3 shows the stay radius position of the pickup 4 (that is, the distance from the rotation center P of the disk 2 to the pickup 4) and the DVD-RAM disk 2 in the optical disk apparatus 1 in the idling state under the environment temperature of 45 ° C. The relationship between the rotation speed and the relationship between the stay radius position of the pickup 4 and the temperature of the LDU is shown. Since the rotational speed of the disk motor 3 is ZCLV controlled as described above, the rotational speed of the DVD-RAM disk 2 changes stepwise as shown in FIG. Further, the rotational speed of the DVD-RAM disk 2 becomes smaller as the staying position of the pickup 4 moves in the outer peripheral direction. On the other hand, the temperature of the LDU increases as the pickup 4 is transferred toward the outer peripheral direction.
[0070]
In the idling state, the temperature of the LDU changes according to the rotational speed of the disk and the position of the pickup 4 as described above. Under the ZCLV control, when the number of rotations of the disk decreases as the pickup 4 moves in the outer circumferential direction of the disk, the efficiency of cooling the pickup 4 decreases due to a decrease in the amount of air coming into contact with the pickup 4. To do. For this reason, the temperature of LDU rises. Further, when the pickup 4 is moved in the disk outer circumferential direction, the area of the pickup 4 exposed to the wind is reduced, so that the cooling efficiency is lowered. For this reason, the temperature of LDU rises.
[0071]
Therefore, when the pickup 4 stays in the vicinity of the disk outer peripheral position, the temperature of the LDU can be lowered as shown in FIG. 3 by increasing the disk rotation speed and transporting the pickup 4 in the disk inner peripheral direction. .
[0072]
Next, a case where the allowable temperature Ta is set to 69 ° C. (Ta = 69) will be described with reference to FIG. When the radial position of the pickup 4 is 57.889 mm (within 34 zones) when the environmental temperature is 45 ° C., the LDU temperature (pickup temperature) T is 70.7 ° C. (T = 70.7), and the allowable temperature Ta or more (T ≧ Ta). On the other hand, when the radial position of the pickup is near 55.823 mm (within 33 zones), the LDU temperature T is 68.9 ° C. (T = 68.9), which is lower than the allowable temperature Ta (T <Ta).
[0073]
From this, it can be seen that the LDU temperature T reaches 70.7 ° C. when the optical disk apparatus shifts to the sleep mode after the recording / reproducing operation is completed and the pickup 4 is transferred to the outermost 34 zones. In this case, the LDU temperature T exceeds the allowable temperature Ta. On the other hand, in the optical disk apparatus according to the present embodiment, the overheat state of the pickup 4 can be detected using the thermistor 5 and the temperature converting means 9, and in the above case, the pickup 4 is moved around the inner circumference of the disk by one zone. By transferring to the 33 zone on the side, the LDU temperature T can be lowered to 68.9 ° C. below the allowable temperature Ta. Thereby, the overheat state of the pickup 4 is eliminated. Thereafter, if the temperature of the pickup 4 is equal to or lower than the allowable temperature Ta, the pickup 4 is returned to the 34 zone again to prevent an increase in power consumption of the disk motor 3 due to windage.
[0074]
As described above, the operation of the optical disc apparatus 1 according to the present embodiment is controlled so that the pickup 4 does not exceed the allowable temperature and the power consumption is minimized. When the environmental temperature is sufficiently low and the pickup 4 does not exceed the allowable temperature even in the sleep mode, the sleep mode state is always maintained, and power consumption can be reduced.
[0075]
When rotating a DVD-RAM disk by ZCLV control, if the seek operation is performed across zones and crossing between zones, the disk rotation speed is changed to a predetermined rotation speed according to the target address. There must be. At this time, power consumption increases and heat generation of the disk motor 3 or the disk motor driver (a part of the disk motor control means 7) is promoted. In this embodiment, in order to improve the cooling efficiency of the pickup 4, a seek operation for moving the pickup 4 across zones is performed. This seek operation is a short-distance seek, and the amount of increase in the disk rotational speed is It is small and is performed in a short time of about several tens of milliseconds. Furthermore, since a weight of 1 minute is inserted after the seek in the inner circumferential direction, the influence of the heat generation can be ignored.
[0076]
As described above, according to the disk device of the present embodiment, the pickup temperature is detected, and the disk motor rotation speed is increased only when the pickup temperature exceeds the allowable temperature, or the pickup is transferred in the inner circumferential direction. Thus, since the operation for improving the cooling efficiency of the pickup is performed, it is possible to achieve both reduction of power consumption and prevention of overheating of the pickup.
[0077]
In the present embodiment, it has been described that the disk rotation speed is set to 135.2 r / min assigned to the 34 zone and the pickup 4 is transferred to the 34 zone at the time of transition to the sleep mode, but the disk rotation speed is set to 135.2 r. If the speed is set lower than / min, the disk windage loss can be further reduced, which is more advantageous for reducing power consumption. Further, if the pickup 4 is moved outside the 34 zone (for example, near the radial position of 60 mm), the disk windage loss can be further reduced, and the power consumption can be further reduced. Furthermore, if the pickup 4 is transferred to the outside of the outer periphery of the DVD-RAM disk 2 (radius position 60 mm or more), the power consumption can be further reduced.
[0078]
Further, the disc rotation speed and the position of the pickup 4 can be controlled independently of each other without being associated and controlled under ZCLV control. That is, the cooling efficiency of the pickup can be improved by controlling the pickup 4 to be moved in the inner circumferential direction of the disk without increasing the disk rotation speed without transferring the pickup 4 or changing the disk rotation speed. Is also possible.
[0079]
Moreover, in this embodiment, when the pickup 4 is determined to be in an overheated state, the method of transferring the pickup 4 one zone at a time is shown. However, the radial position of the pickup 4 and the LDU temperature as shown in FIG. As a function, the temperature conversion means 9 is provided in advance, and an address for reducing the LDU temperature T to the allowable temperature Ta or less is obtained according to the LDU temperature T and the address of the pickup 4, and the pickup 4 is set to the address obtained above. It is also possible to transport. Thereby, the cooling rate of the pickup 4 can be increased.
[0080]
Further, in the above-described embodiment, the mode in which the overheat state of the pickup 4 is measured after the recording / reproducing operation using the pickup 4 is completed and before the transition to the sleep mode is described. The measurement may be performed during the recording / reproducing operation. In the optical disc apparatus 1, since the temperature of the pickup 4 can be constantly measured using the thermistor 5, the overheated state of the pickup 4 can be detected even during the recording / reproducing operation. When the overheat state of the pickup 4 is detected, the recording / reproducing operation is temporarily interrupted, and the control for increasing the number of rotations of the disk as described above and / or the control for moving the pickup closer to the center of rotation of the disk is performed. Thus, the cooling efficiency of the pickup may be improved.
[0081]
(Embodiment 2)
FIG. 4 shows a configuration of the optical disc device 21 according to the second embodiment. The main difference between the optical disk apparatus 21 of the present embodiment and the optical disk apparatus 1 of the first embodiment is that the temperature of the pickup 4 is not directly measured using a temperature measuring device such as a thermistor but the rotational speed of the disk motor 3. The overheating state of the pickup 4 is indirectly detected using the information or the information regarding the position of the pickup 4. By doing so, it is not necessary to provide the temperature measuring device provided in the optical disc apparatus 1 of the first embodiment, so that the configuration of the disc apparatus can be further simplified.
[0082]
Note that the DVD-RAM disk 2, the disk motor 3, the pickup 4, the transfer device 6, and the host 12 shown in FIG. 4 have the same configuration as that described in the first embodiment. The description of is omitted.
[0083]
As shown in FIG. 4, the optical disc apparatus 21 includes a host controller 29. The host controller 29 includes a CPU, DSP, RAM, ROM, and the like, and controls the disk motor 3 and the transfer device 6 based on programs and data stored in advance in the ROM. The host controller 29 includes interface control means 28 for exchanging commands or data with the host 12, disk motor control means 24, transfer control means 25, and timing means 27.
[0084]
The disk motor control means 24 controls and drives the disk motor 3. The disk motor control means 24 also has a function of detecting the number of rotations of the disk motor 3 from a rotation detection signal output from a hall element provided in the disk motor 3.
[0085]
The transfer control means 25 controls and drives the transfer device 6 in order to transfer the pickup 4 to a target position. The transfer control means 25 also has a function of detecting the number of rotations of the stepping motor 6a (or the transfer amount of the pickup 4) based on the encoder output of the stepping motor 6a provided in the transfer device 6. Thereby, the position of the pickup 4 can be detected. However, the position of the pickup 4 can also be detected based on the address information read from the disk 2 by the pickup 4.
[0086]
The time measuring means 27 measures time by using the operation clock of the CPU. The time measuring means 27 can measure the elapsed time from the time when the reset signal is received from the disk motor control means 24 or the transfer control means 25.
[0087]
The interface control means 28 can exchange commands and transfer data with the host 12 connected to the outside of the optical disk device 21.
[0088]
Next, the operation of the optical disc apparatus 21 will be described with reference to FIG. Hereinafter, a case will be described in which an overheat state of the pickup is detected after the recording / reproducing operation (read / write) is completed and before shifting to the sleep mode.
[0089]
After the recording / reproducing operation is completed, the disk motor control unit 24 detects the number of rotations of the disk from the rotation detection signal of the disk motor 3, or the transfer control unit 25 detects the position of the pickup 4 from the encoder output of the stepping motor 6. (S21). Note that the position of the pickup 4 may be detected based on address information read from the disk 2 by the pickup 4.
[0090]
Next, it is determined whether or not the rotational speed of the disk motor detected in step S21 (that is, the rotational speed of the DVD-RAM disk) or the position of the pickup 4 is within a predetermined range (S22). . More specifically, it is determined whether or not the rotational speed of the disk motor is higher than a predetermined rotational speed, or whether or not the position of the pickup 4 is on the inner circumference side of the disk with respect to a predetermined position on the disk. . In this process S22, it is determined whether or not the pickup 4 is in an overheated state based on the rotational speed of the disk 2 or the position of the pickup 4.
[0091]
When the rotational speed of the disk 2 is relatively high or the pickup 4 is located at a position relatively close to the center of rotation of the disk 2, the pickup 4 is cooled by the air flow generated as the disk 2 rotates. It is easy to be done. In this case, as shown in FIG. 3, in the idling state, the temperature of the pickup 4 is predicted to be relatively low after a predetermined time (for example, 30 seconds) has elapsed. Therefore, in this case, it is determined that the pickup 4 is not overheated.
[0092]
On the other hand, when the rotational speed of the disk 2 is relatively low, or when the pickup 4 is located at a position relatively far from the rotational center of the disk 2, the pickup 4 moves along with the rotation of the disk 2. It is in a state where it is difficult to be cooled by the generated air flow. In this case, as shown in FIG. 3, in the idling state, the temperature of the pickup 4 is predicted to be relatively high after a predetermined time has elapsed. Therefore, in this case, it is determined that the pickup 4 is in an overheated state.
[0093]
If it is determined in step S22 that the pickup 4 is not in an overheated state, a wait (waiting time) is entered for 3 minutes, and then the mode shifts to the sleep mode (S23 and S24). The reason why the waiting time of 3 minutes is provided in the process S23 is that the pickup 4 is easily air-cooled at the time of the process S22 (that is, the disk rotational speed is high or the pickup position is on the inner circumference side of the disk). This is because it is preferable to cool the pickup for a predetermined time before shifting to the sleep mode because the temperature of the pickup at that time may be relatively high. Further, by preventing the shift to the sleep mode immediately after the recording / reproducing operation is completed, when the optical disk apparatus 21 receives the next command from the host 12 in a short time, it is promptly based on this command. This is because the recording / reproducing operation can be performed.
[0094]
After such a waiting time, one or both of the following two controls are performed in the sleep mode (S24). First, the disk speed is set to the minimum speed. Here, the DVD-RAM disk 2 is rotated at a speed of 1335.2 r / min assigned to the 34th zone, which is the lowest among the predetermined disk rotation speeds for recording and reproducing. Second, the pickup 4 is transferred to the 34 zone which is the outermost peripheral zone of the DVD-RAM disk 2. The 34 zone is within the radial position range of 56.787 mm to 57.889 mm, which is near the outermost periphery, with respect to the radius of 60 mm of the DVD-RAM disk 2. In this way, the windage loss during disk rotation can be reduced, so that the power consumption of the disk device can be reduced.
[0095]
In the present embodiment, after shifting to the sleep mode in the process S24, the process returns to the process S21 again. This is because in the sleep mode, the power consumption can be reduced, but the effect of cooling the pickup is low, and the temperature of the pickup may increase. In order to prevent such a temperature rise of the pickup, it is desirable to determine whether or not the pickup is overheated by detecting the position of the pickup again after shifting to the sleep mode. For example, in the present embodiment, since the pickup is moved to the outermost zone of the disk in the sleep mode, if the pickup position is detected again in step S21, it is always determined in step S22 that the pickup is overheated. In this case, as will be described later, the disk device operates so as to lower the temperature of the pickup, and after the temperature of the pickup is lowered, the disk device shifts again to the sleep mode. In this way, since the pickup is periodically cooled during the sleep mode, the power consumption of the disk device can be reduced as much as possible, and an overheating state of the pickup can be appropriately prevented.
[0096]
However, if it has been confirmed in advance that the pickup will not overheat even in the sleep mode, the sleep mode is maintained until the next recording / playback command is received, so that the power consumption of the disk device is best reduced. It may be.
[0097]
If it is determined in step S22 that the rotational speed of the disk motor is lower than the predetermined rotational speed or that the position of the pickup 4 is on the outer periphery side of the disk with respect to the predetermined position on the disk, Is reset (S25), and measurement of elapsed time is started. Next, it is determined whether the elapsed time is 30 seconds or longer (S26).
[0098]
If it is determined in the process S26 that it is less than 30 seconds, the process S26 is executed until it reaches 30 seconds or more, and the cooling enhancement of the pickup is prohibited for 30 seconds. During this period, when the optical disc apparatus 21 receives a command for performing the recording / reproducing operation from the host 12, the optical disc apparatus 21 can promptly execute the recording / reproducing operation based on the command.
[0099]
In the present embodiment, the temperature of the pickup (predicted pickup temperature) is measured in advance when a preset time (30 seconds above) has elapsed in the idling state. This predicted pickup temperature varies depending on the number of disk revolutions during idling or the position of the pickup. As shown in FIG. 3, the predicted pickup temperature is high when the disk rotation speed is low and the pickup is located on the outer circumference side of the disk, and is low when the disk rotation speed is high and the pickup is located on the inner circumference side of the disk. Become. Therefore, whether or not the temperature of the pickup exceeds the allowable temperature after a lapse of a predetermined time depends on whether the disk rotational speed is lower than the predetermined rotational speed or whether the pickup position is on the outer circumference side of the disk with respect to the predetermined position. This can be determined by detecting the above. For this reason, it is possible to detect the overheating state of the pickup by detecting whether or not the disk rotation speed or the pickup position is within a predetermined range in the process S22.
As described above, in this embodiment, the disk motor control means 24 or the transfer control means 25 is used to detect the disk rotation speed or the position of the pickup 4, and the time measuring means 27 is used to detect the disk detected by the optical disk device. The overheat state of the pickup is detected by measuring the rotation speed or the time that the pickup is maintained.
[0100]
When it is determined in the process S26 that it is 30 seconds or longer (after a predetermined time has elapsed), the following two controls are performed. First, the pickup 4 is transferred to the 0 zone, that is, from PBA 31000h to PBA 398DFh (radial position 24.101 mm to 24.964 mm). By this transfer, the area of the pickup 4 exposed to the wind accompanying the disk rotation is increased, and the pickup 4 (particularly LDU) can be effectively cooled. Secondly, the disk rotational speed is increased to 3246.0 r / min determined in association with the zero zone. The increase in the number of revolutions of the disk increases the amount of air that accompanies the disk rotation that strikes the pickup 4, so that the pickup 4 can be effectively cooled.
[0101]
After the pickup 4 is transferred to the 0 zone in the process S27, the process returns to the process S21 again. Thereafter, it is determined in the process S22 that it is not overheated, and in the process S23, after the pickup is sufficiently cooled for 3 minutes, the disk device shifts to the sleep mode.
[0102]
As described above, according to the present embodiment, the temperature of the pickup 4 after a predetermined time has elapsed can be predicted by detecting the position of the pickup 4 and the rotational speed of the disk motor 3 without providing a temperature measuring device such as a thermistor. can do. As described above, it is possible to provide a disk device in which the power consumption and the pickup temperature are optimized by indirectly detecting the overheating of the pickup 4 from information such as the disk motor rotation speed and the pickup position. In the present embodiment, information such as changes in environmental temperature cannot be obtained. However, when the optical disk device 21 is used within a predetermined guaranteed temperature range, the temperature of the pickup is suppressed to an allowable temperature or less. be able to.
[0103]
If emphasis is placed on preventing overheating of the pickup, the process may be shifted to the sleep mode only when the pickup is in the innermost zone 0 in the process S22 for determining overheating. In this case, after the recording / reproducing operation is completed, the pickup located in a zone other than the zero zone is determined to be in an overheated state in step S22, and then moved to the zero zone in step S27. Thereafter, the process returns to the process S21, and in the process S22, it is determined that the state is not overheated, so the process proceeds to the process S23, and the pickup is cooled for 3 minutes. If the pickup is located in the 0 zone after the recording / reproducing operation is completed, a cooling process for 3 minutes is performed in S23 without moving the pickup from the 0 zone. In this manner, after the recording / reproducing operation is completed, if the disk device does not receive the next command from the host, the pickup is forcibly moved to the 0 zone regardless of the position. The cooling is always performed for a predetermined time with the highest cooling efficiency. Therefore, overheating of the pickup can be appropriately prevented.
[0104]
(Embodiment 3)
FIG. 6 shows the configuration of the disk device of the third embodiment. The main difference between the disk device 31 of the present embodiment and the disk device 21 of the second embodiment is that the disk device 31 can also be used for the DVD-RAM disk 2 built in the dedicated cartridge 32.
[0105]
Since the DVD-RAM disk 2, the disk motor 3, the pickup 4, the transfer device 6, the host 12 and the like shown in FIG. 6 have the same configuration as that described in the first and second embodiments of the present invention, These descriptions are omitted.
[0106]
The optical disk device 31 includes a loading mechanism (not shown) that can load both a DVD-RAM disk not stored in the cartridge and a DVD-RAM disk stored in the cartridge.
[0107]
The optical disk device 31 includes a cartridge detection switch 33. When the disk accommodated in the cartridge 32 is introduced into the optical disk device 31, the cartridge detection switch 33 is pressed by the cartridge 32 and is turned on. When the cartridge 32 is not accommodated or when the disc itself is not inserted, the cartridge detection switch 33 is not pressed and is in the OFF state.
[0108]
The optical disk device 31 includes a host controller 39. The host controller 39 includes a CPU, DSP, RAM, ROM, and the like, and controls the disk motor 3 and the transfer device 6 based on programs and data stored in advance in the ROM. The host controller 39 includes interface control means 38 for exchanging commands or data with the host 12, disk motor control means 34, transfer control means 35, timing means 37, and cartridge detection means 36.
[0109]
The disk motor control means 34 controls and drives the disk motor 3.
The disk motor control means 34 also has a function of detecting the rotational speed from the rotation detection signal output from the disk motor 3.
[0110]
The transfer control means 35 controls and drives the transfer device 6 in order to transfer the pickup 4 to a target address. The transfer control means 25 also has a function of detecting the number of rotations of the stepping motor (or the transfer amount of the pickup 4) based on the encoder output of the stepping motor provided in the transfer device 6.
[0111]
The cartridge detection unit 36 detects whether the cartridge detection switch 33 is ON / OFF, thereby determining whether the disk 2 is mounted in a state where it is accommodated in the cartridge or not.
[0112]
The time measuring means 37 measures time by using the operation clock of the CPU. The time measuring means 37 can measure the elapsed time from the time when the reset signal is received from the disk motor control means 34 or the transfer control means 35.
[0113]
The interface control means 38 can exchange commands and transfer data with the host 12 connected to the outside of the optical disk device 31.
[0114]
FIG. 7 is a plan view showing the positional relationship between the DVD-RAM disk 2 housed in the cartridge 32 and the pickup 4. The cartridge 32 includes a shutter 40 for opening and closing the opening 41. The opening 41 is formed on the inner peripheral side of the disk with respect to the connecting portion 44 provided for reinforcing the cartridge 32. When the cartridge 32 is not introduced into the optical disk device 31, the shutter 40 is closed, and the recording / reproducing surface of the DVD-RAM disk 2 is protected from the outside. When the cartridge 32 is introduced into the optical disc apparatus 31, the shutter 40 is opened by a loading mechanism (not shown) provided in the optical disc apparatus. As a result, the recording / reproducing surface of the DVD-RAM disk 2 is exposed through the opening 41.
[0115]
When performing the recording / reproducing operation, the pickup 4 is moved so that the objective lens 4b provided in the pickup 4 for condensing the laser beam is positioned in the opening 41. The pickup 4 can move along the radial direction of the disc. In the opening 41, the objective lens 4b is opposed to the recording / reproducing surface of the DVD-RAM disk 2 in a close proximity, and information recording is performed by converging a laser beam spot to a predetermined address on the disk 2. / Perform playback. The pickup 4 includes a laser device such as the LDU 42 and the LDD 43, a head amplifier (not shown), and the like. The laser device and the head amplifier can generate heat during a recording / reproducing operation.
[0116]
Here, the distance from the center 2a of the DVD-RAM disk 2 to the objective lens 4b is defined as “pickup radius position Rp”. Further, the distance from the objective lens 4b to the LDU 42 in the moving direction of the pickup 4 is defined as “LDU / objective lens transfer distance Rd”, and the distance from the disc center 2a to the outer end of the opening 41 is referred to as “opening edge transfer”. It is defined as “distance Rc”. The radial position of the LDU 42, that is, the distance from the disk center 2 a to the LDU 42 (hereinafter referred to as “LDU transfer distance”) is expressed by the sum (Rp + Rd) of the pickup radial position Rp and the LDU / objective lens transfer distance Rd. The In the present embodiment, when the pickup 4 moves in the user area, the pickup radius position Rp changes between 24.101 mm and 57.889 mm (24.101 ≦ Rp ≦ 57.889). The LDU / objective lens transfer distance Rd is 13.2 mm (Rd = 13.2), and the open end transfer distance Rc is 60.8 mm (Rc = 60.8).
[0117]
When the pickup 4 (objective lens 4b) is located at the innermost circumference of the disc in the user area (Rp = 24.101), the LDU transfer distance Rp + Rd is 37.301 mm (Rp + Rd = 37.301). In this case, since the relationship Rp + Rd <Rc is established, the LDU 42 is positioned inside the opening 41. When the pickup 4 is located on the outermost periphery of the disk in the user area (Rp = 57.889), the LDU transfer distance Rp + Rd is 71.089 mm (Rp + Rd = 71.089), and the relationship Rp + Rd> Rc is established. The LDU 42 is located outside the opening 41, that is, outside the cartridge 32.
[0118]
Next, the operation of the optical disc apparatus 31 will be described with reference to FIG. Hereinafter, a case will be described in which an overheat state of the pickup is detected after the recording / reproducing operation (read / write) is completed and before shifting to the sleep mode.
[0119]
After the recording / reproducing operation (read / write) is completed, the cartridge detection means 36 detects whether the cartridge 32 is present by detecting the ON / OFF state of the cartridge detection switch 33 (S31). In the case of a disk without the cartridge 32, the heat generated by the pickup 4 and the disk motor 3 is not shielded by the cartridge, but is effectively agitated by the air flow generated as the disk rotates, and the temperature of the pickup 4 This is because the rise is relatively small, and the mode immediately shifts to a sleep mode (S36) described later. In the case of a disk without the cartridge 32, the sleep mode is always maintained and power consumption is reduced.
[0120]
If it is determined in step S32 that the cartridge 32 is present, the transfer control means 25 detects the position of the pickup 4 from the encoder output of the stepping motor and the address information read from the disk 2 by the pickup 4 (S33).
[0121]
Next, it is determined whether or not the position of the pickup 4 detected in the process S33 (here, the address of the pickup 4) is in the 24 zone on the disk surface or on the inner circumference side of the disk from the 24 zone (S34). The reason why the 24 zones are set as a reference is to determine whether the LDU 42 is located inside or outside the opening 41. The LDU 42 is a part that can generate heat in the pickup, and is a part that is particularly required to perform temperature control.
[0122]
When the address of the pickup 4 is in the 24 zone, the difference between the opening end transfer distance Rc and the LDU / objective lens transfer distance Rd is 47.6 mm (Rc−Rd = 47.6) and the pickup radial position Rp. Match. In the 24 zone, the address of the pickup 4 is in the range of PBA17F5F0h to PBA19212Fh (radius positions 47.144 mm to 48.108 mm). Therefore, when the pickup is in a zone outside the 24 zone, the LDU 42 is positioned outside the opening 41. When the disk motor 3 is rotating by ZCLV control, the disk motor rotation speed is 1656.0 r / min (rotation period 27.60 Hz) in the 24 zone.
[0123]
In process S34, if the address of the pickup 4 is in the 24 zone or on the inner circumference side of the disc from the 24 zone, it is determined that the pickup is not in an overheated state, and a wait (waiting time) is entered for 3 minutes as in the second embodiment. (S35) After that, the mode shifts to the sleep mode (S36). In the sleep mode, the following two controls are performed. First, the disk speed is set to the minimum speed. Here, the DVD-RAM disk 2 is rotated at a speed of 1335.2 r / min assigned to the 34th zone, which is the lowest among the predetermined disk rotation speeds for recording and reproducing. Second, the pickup 4 is transferred to the 34 zone which is the outermost peripheral zone of the DVD-RAM disk 2. The 34 zone is within the radial position range of 56.787 mm to 57.889 mm, which is near the outermost periphery, with respect to the radius of 60 mm of the DVD-RAM disk 2.
[0124]
In this embodiment, after shifting to the sleep mode in step S36, the process returns to step S32. This is to effectively prevent the pickup from generating heat after shifting to the sleep mode, as in the second embodiment.
[0125]
If it is determined in step S34 that the address of the pickup 4 is not in the 24 zone or further on the inner circumference side of the disc, the time measuring means 37 resets the timer (S37) and starts measuring elapsed time. Next, it is determined whether the elapsed time is 30 seconds or more (S38).
[0126]
When it is determined in the process S38 that it is less than 30 seconds, the process S38 is executed until it reaches 30 seconds or more. That is, the cooling enhancement of the pickup is prohibited for 30 seconds.
[0127]
If it is determined in process S38 that it is 30 seconds or longer, the pickup 4 is transferred to zone 0 (S39). By this transfer, the LDU 42 which is a heat generating part in the pickup 4 comes to be positioned in the opening, so that the LDU 42 can be effectively cooled by the wind generated with the disk rotation. When the disk rotation speed is controlled by ZCLV, processing for increasing the disk rotation speed to the maximum rotation speed is simultaneously performed. As a result, the flow rate of the wind generated as the disk rotates increases, so that the LDU 42 can be effectively cooled.
[0128]
In the above embodiment, when the LDU 42 is outside the opening 41, it is determined that the pickup is in an overheated state, and the pickup is moved to the inner circumferential side of the disk. The overheat state of the pickup may be determined according to the position of (for example, LDD 43). For example, when the LDD 43 and the LDU 42 are provided close to each other, the LDU 42 may be heated by the LDD 43 generating heat. In this case, it is necessary to cool the LDD 43 in order to appropriately prevent the LDU 42 from overheating. Therefore, in this case, when the LDD 43 that is the heat generating portion is located outside the opening 41, the pickup may be moved to the inner peripheral side of the disc.
[0129]
After performing the operation for improving the cooling efficiency of the pickup in this manner, the process returns to step S32 again, and the operation for preventing overheating of the pickup is continued while reducing the power consumption as much as in the second embodiment. .
[0130]
FIG. 9 is a diagram for explaining the LDU temperature reduction effect at an environmental temperature of 45 ° C. FIG. 9 shows the transition of the LDU temperature when the pickup 4 is moved from the disk outermost periphery to the disk innermost periphery. As can be seen from the figure, when the pickup 4 is located at the innermost circumference of the disk, a reduction effect of about 4 ° C. in 3 minutes and about 5 ° C. in 9 minutes can be obtained. In the present embodiment, the process S35 has been described as a 3-minute wait, but FIG. 9 illustrates a case where a sufficiently long wait time (20 minutes or more) has elapsed.
[0131]
Also in the present embodiment, as in the second embodiment, the predicted temperature of the pickup after a predetermined time has been obtained by detecting the address of the pickup 4. In this way, it is possible to prevent the pickup from being overheated by directly detecting the overheating of the pickup from the position of the pickup without directly measuring the temperature of the pickup.
[0132]
Further, since the operation for improving the cooling efficiency of the pickup is performed only for the case where there is a cartridge 32 that is likely to accumulate heat inside the optical disk apparatus 31, it is difficult for heat to be accumulated inside the disk apparatus, and CD-ROM or DVD When recording and reproducing a bare disk such as a ROM, the power consumption can be reduced by shifting to the sleep mode without performing an operation for improving the cooling efficiency of the pickup.
[0133]
In the description of the sleep mode operation of the present embodiment, it is described that the ON / OFF state of the cartridge detection switch 33 is detected after the recording / reproducing operation is completed. However, the DVD-RAM disk 2 is loaded by a loading mechanism (not shown). If it is detected once when it is introduced into the optical disk device 31, the same state is maintained until the DVD-RAM disk 2 is subsequently ejected from the optical disk device 31, so the presence or absence of the cartridge 32 is detected many times. It is not necessary.
[0134]
In the above embodiment, in step S39, the pickup is transferred to the innermost area (zone 0) in the user area (recording / reproducing area where information can be recorded or reproduced) on the DVD-RAM disc. The cooling efficiency is improved. In this case, since the pickup is located in the user area, the disc apparatus can immediately perform the operation when the next command for performing the recording / reproducing operation on the disc is received from the host. In particular, when a command for performing a recording / reproducing operation on an area on the relatively inner circumference side of the disc is received, the operation can be executed promptly.
[0135]
However, when emphasis is placed on preventing overheating of the pickup 4, the pickup may be transferred to the inner side of the zero zone of the user area in step S39. For example, in a DVD-RAM disc, a lead-in area in which disc management information is recorded is provided inside the zero zone, and the pickup 4 can move to this lead-in area. In this case, if the pickup 4 is moved to the lead-in area, the pickup 4 can be more easily exposed to the wind generated by the disk rotation, so that the pickup 4 can be effectively cooled.
[0136]
(Embodiment 4)
FIG. 10 is a diagram for explaining the operation of the disk device according to the fourth embodiment. In the present embodiment, a mode in which overheating of the pickup is detected while the disk device is performing the recording / reproducing operation, not in the idling state before the transition to the sleep mode will be described. The configuration of the disk device of the present embodiment is the same as that of the disk device of the second embodiment shown in FIG.
[0137]
As shown in the figure, after the recording / reproducing operation is started in step S40, the disk rotation speed or the position of the pickup 4 is set using the disk motor control means 24 (see FIG. 4) or the transfer control means 25 (see FIG. 4). It detects (S41). Next, it is determined whether or not these are within a predetermined range (S42). More specifically, it is determined whether or not the disk rotational speed is higher than a predetermined rotational speed, or whether or not the pickup 4 is positioned on the inner circumference side of the disk with respect to a predetermined position.
[0138]
If it is within the predetermined range in the process S42, the possibility that the pickup 4 will overheat is low. In this case, the counter of the time measuring means 27 is reset (S43), and the disk rotation speed or the position of the pickup 4 is detected again (S41). In the present embodiment, the disk device may receive a recording / reproducing command from the host even while the pickup 4 is detecting an overheated state in this way, and the disk rotation speed and the position of the pickup 4 change greatly according to the command. There is a case.
[0139]
On the other hand, if it is not within the predetermined range in step S42, it is determined that the pickup 4 is in a state where it is likely to be overheated. However, if the state in which the pickup 4 is likely to be overheated continues only for a short time, the performance of the pickup 4 will not deteriorate. Therefore, by increasing the value of the counter provided in the time measuring means 27 (S44) and determining whether or not the counter value exceeds a predetermined value (S45), a state in which the pickup 4 is likely to be overheated is predetermined. It is determined whether or not it has continued beyond the time (allowable time).
[0140]
If it is determined in the process S45 that the predetermined time has not elapsed, the process returns to the process S41, and the disk rotation speed or the position of the pickup 4 is detected again. Next, when it is detected from the disk rotational speed or the position of the pickup 4 detected in the process S41 that the state in which the pickup 4 is likely to be overheated continues in the process S42, the counter of the time measuring means is further set in the process S44. increase. Next, in process S45, it is determined whether or not the updated counter value exceeds a predetermined value.
[0141]
In this way, during the recording / reproducing operation, by continuously detecting the disk rotation speed or the position of the pickup 4, it is possible to monitor whether or not the state in which the pickup 4 is easily overheated continues for a long time. it can. In the process S45, when the counter value exceeds a predetermined value and an overheated state of the pickup 4 is detected, the recording / reproducing operation is interrupted once, and the disk rotational speed is increased as shown in the above embodiment, or An operation for improving the cooling efficiency of the pickup 4 is performed by moving the pickup 4 to the inner circumference side of the disk. Thereby, overheating of a pickup can be prevented appropriately.
[0142]
【The invention's effect】
According to the present invention, when an overheating of the pickup is detected, the rotational speed of the disk is increased, or the pickup is moved so as to approach the rotation center of the disk. The efficiency of cooling the pickup can be improved. Therefore, the pickup can be appropriately protected.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a disk device according to a first embodiment of the present invention.
FIG. 2 is a flowchart showing the operation of the disk device according to the first embodiment of the present invention.
FIG. 3 is a diagram showing a relationship between a pickup radial position, a disk rotation speed, and an LDU temperature.
FIG. 4 is a diagram showing a configuration of a disk device according to a second embodiment of the present invention.
FIG. 5 is a flowchart showing the operation of the disk device according to the second embodiment of the present invention.
FIG. 6 is a diagram showing a configuration of a disk device according to a third embodiment of the present invention.
FIG. 7 is an explanatory diagram showing a positional relationship between a pickup and a cartridge according to Embodiment 3 of the present invention.
FIG. 8 is a flowchart showing the operation of the disk device according to the third embodiment of the present invention.
FIG. 9 is a diagram illustrating an LDU temperature reduction effect according to Embodiment 3 of the present invention.
FIG. 10 is a flowchart showing the operation of the disk device according to the fourth embodiment of the present invention.
FIG. 11 is a plan view of a DVD-RAM disk used in the embodiment of the present invention.
FIG. 12 is a plan view of a conventional magnetic disk device.
[Explanation of symbols]
1 Optical disk device
2 DVD-RAM disc
3 Disc motor
4 Pickup
5 Thermistor
6 Transfer device
7 Disc motor control means
8 Transfer control means
9 Temperature conversion means
10 Timekeeping means
11 Interface control means
12 hosts
13 Host controller

Claims (9)

A motor for rotating a disk-shaped recording medium;
A pickup having a laser device and at least writing information to the recording medium or reading information from the recording medium;
A rotation controller for controlling the rotation speed of the recording medium;
An overheat detector for detecting an overheat state of the laser device,
A disk device that cools the laser device using an air flow generated by rotation of the recording medium,
After completion of the recording operation, in a case where the overheat detector detects overheating of the laser device, the rotation controller increases the rotational speed of the recording medium, or,
During the recording / reproducing operation, when the overheat detector detects an overheating state of the laser device, the recording / reproducing operation is interrupted, and the rotation controller increases the number of rotations of the recording medium,
Accordingly, a disk device that performs an operation of improving the efficiency of cooling the laser device. The disk device according to claim 1 , wherein the overheat detector includes a temperature measuring device that measures a temperature of the laser device. The disk device according to claim 1 , wherein the overheat detector includes a rotation number detector that detects a rotation number of the recording medium, and detects an overheat state of the laser device based on an output of the rotation number detector. The overheat detector further includes a timing device that measures a period during which the rotation speed of the recording medium is within a predetermined rotation speed range, and the laser device is overheated using the rotation speed detector and the timing device. The disk device according to claim 3 , wherein the disk device is detected. The disk device according to claim 1 , wherein the overheat detector includes a position detector that detects a position of the pickup, and detects an overheat state of the laser device based on an output of the position detector. The overheat detector further includes a time measuring device that measures a period during which the position of the pickup is within a predetermined position range, and detects an overheat state of the laser device using the position detector and the time measuring device. Item 6. The disk device according to Item 5 . The disk device according to claim 1 , further comprising a cartridge detector that determines whether or not the recording medium is connected to the motor in a state of being accommodated in the cartridge. When the cartridge detector determines that the recording medium is connected to the motor in a state where the recording medium is accommodated in a cartridge, and performs an operation of improving the cooling efficiency of the laser device; and
The operation for improving the cooling efficiency of the laser device is not executed when the cartridge detector determines that the recording medium is not accommodated in the cartridge and is connected to the motor. Item 8. The disk device according to Item 7 . Cooling of the laser device when the pickup does not receive a control signal from a host device that controls the operation of the pickup to record information on the recording medium and the operation of the pickup to reproduce information from the recording medium. The disk device according to claim 1 , wherein an operation for improving efficiency is executed.

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