JP2003077133A - Optical recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical recording and reproducing device which guarantees a stable recording quality and the life of the device. SOLUTION: The optical recording and reproducing device is provided with a light source 5 which emits light irradiating an optical disk 1 which has a fixed recording linear density and is recordable, a rotation driving means 2 which rotates and drives the optical disk 1, rotation speed control means 3 and 4 which control the rotation driving means 2 to a prescribed speed, a temperature information acquisition means 16 which obtains the internal temperature, and a system control means 19 which controls the rotation speed control means 3 and 4 so that the rotation driving means 2 can rotate and drive the optical disk 1 at a rotation speed corresponding to the obtained temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording / reproducing device.

[0002]

2. Description of the Related Art At present, in an optical disk recording / reproducing apparatus typified by a CD-ROM or the like, the thickness and size of the apparatus have been reduced, and the demand for higher performance and higher processing speed has led to L
The number of circuit elements constituting a drive / signal processing control system such as SI has increased, and heat generation of these circuit elements and temperature rise in the device due to high-speed operation of the drive mechanism section have become problems.

The recent increase in the recording speed of optical discs is remarkable, and the temperature rise of the optical disc recording / reproducing apparatus is also increasing. Recording on the optical disc is realized by turning on the semiconductor laser in a pulsed manner on the optical disc.
In order to realize stable high-speed recording on an optical disk, the recording power of the semiconductor laser must be increased as the recording speed becomes higher. The increase in the recording power of the semiconductor laser causes the temperature of the semiconductor laser to rise.

In order to realize a high recording speed,
The drive mechanism such as a motor for rotating the disk and a motor for moving the semiconductor laser to the recording position must be operated at a high speed, and the high temperature operation causes a temperature rise due to heat generation.

As described above, the increase in the recording speed leads to the temperature rise of the semiconductor laser, the temperature rise of the drive motor, and the temperature rise due to the high-speed processing of each LSI, and the temperature inside the optical disc recording / reproducing apparatus is increasing year by year. . These temperature rises affect the life of the device and the accuracy of recording / reproduction for recording on an optical disc, which requires extremely high precision control and optical control.

The amount of light emitted from a semiconductor laser for recording information on an optical disk is determined by the IL characteristic (relationship between applied current and laser light output), and laser oscillation does not occur unless a current above a threshold value is passed. This I-L characteristic has temperature dependence and becomes non-linear as the temperature rises, and even if the applied current is raised, the light output does not rise proportionally. This means that the recording accuracy of the optical disk is affected.

Further, in order to emit light with the same light output amount even if the temperature rises, the applied current value must be increased. However, the increase of the applied current has a great influence on the shortening of the laser life. Therefore, it is an important issue to prevent the temperature rise.

Further, a recording medium such as a CD-R / RW has a recommended operating environment temperature for guaranteeing the recording quality, and an increase in the temperature inside the apparatus due to the increase in the recording speed may cause the deterioration of the recording quality. There are also.

[0009]

As described above, the temperature rise in the optical recording / reproducing apparatus is a serious problem in terms of recording quality and the life of the apparatus, and it is important to prevent the temperature rise in the apparatus. Is coming.

Until now, various methods have been proposed to prevent this temperature increase. There have been various proposals such as installing a fan in the device, taking in outside air, and releasing heat to prevent the temperature from rising, and installing a heat sink, but these are costly, and the device is thin and compact. However, there is also a problem with the installation space of the heat dissipation component in the device.

It is an object of the present invention to solve these problems and provide an optical recording / reproducing apparatus which guarantees stable recording quality and the life of the apparatus.

[0012]

In order to achieve the above object, the invention according to claim 1 provides a light source for emitting light to irradiate a recordable optical disk having a constant recording linear density, and a rotary drive for rotationally driving the optical disk. Means, a rotation speed control means for controlling the rotation drive means to a predetermined speed, a temperature information acquisition means for obtaining the internal temperature, and a rotation drive means for rotating the optical disk at a rotation speed according to the obtained temperature. The optical recording / reproducing apparatus having the system control means for controlling the rotation speed control means is the most main feature.

According to a second aspect of the present invention, in the optical recording / reproducing apparatus of the first aspect, when the temperature inside the apparatus is likely to exceed a temperature at which a stable recording operation is guaranteed, a command of the system control means is issued. Based on the control of the rotation speed control means, the rotation driving means is characterized mainly by an optical recording / reproducing device that immediately shifts to the minimum rotation speed drive.

According to a third aspect of the present invention, in the optical recording / reproducing apparatus according to the first aspect, when the temperature inside the apparatus is likely to exceed the temperature at which a stable recording operation is guaranteed, the system control means issues a command. The main feature of the optical recording / reproducing apparatus is that the rotation drive means immediately shifts to the lowest rotation speed drive and then gradually changes the rotation speed to the high speed drive under the control of the rotation speed control means.

According to a fourth aspect of the present invention, in the optical recording / reproducing apparatus according to the first aspect, when the temperature inside the apparatus is likely to exceed a temperature at which a stable recording operation is guaranteed, a command of the system control means is issued. The main feature of the optical recording / reproducing apparatus is that the rotation drive means immediately shifts to a sufficiently low rotation speed drive under the control of the rotation speed control means.

According to a fifth aspect of the present invention, in the optical recording / reproducing apparatus according to the first aspect, when the temperature inside the apparatus is likely to exceed a temperature at which a stable recording operation is guaranteed, the system control means issues a command. Based on the control of the rotation speed control means, the rotation drive means immediately shifts to a sufficiently low rotation speed drive, and then the rotation speed is gradually changed to a high speed drive. To do.

According to a sixth aspect of the present invention, in the optical recording / reproducing apparatus of the first aspect, when the temperature inside the apparatus is likely to exceed the temperature at which a stable recording operation is guaranteed, the rotary driving means immediately operates. The main feature is an optical recording / reproducing apparatus that shifts to a rotational speed drive at a low speed.

According to a seventh aspect of the present invention, in the optical recording / reproducing apparatus of the first aspect, when the temperature inside the apparatus is likely to exceed the temperature at which a stable recording operation is guaranteed, the system control means issues a command. Based on the control of the rotation speed control means, the rotation drive means immediately shifts to a rotation speed drive that is one step lower, and then, until the temperature inside the device reaches a temperature at which a stable recording operation is sufficiently guaranteed, The main feature of the optical recording / reproducing apparatus is that the speed is gradually changed to low-speed drive in each step.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an optical recording / reproducing apparatus [CD-R / RW (CD-Recordable / Reproduced according to an embodiment of the present invention.
writable)]. An optical disc (CD or CD-ROM disc) 1 is rotationally driven by a spindle motor 2. The spindle motor 2 is controlled by the motor driver 3 and the servo processing unit 4 so as to have a constant speed.

The optical pickup 5 is a semiconductor laser not shown in FIG. 1, an optical system (lens, etc.), a focus actuator (a mechanism for moving the position of the lens in a direction perpendicular to the disc so that the laser beam is focused on the disc), A track actuator (a mechanism that moves the lens in the radial direction (sledge direction) of the disc so that the focus of the laser beam traces the track), a light-receiving element, a position sensor, etc. are built in, and the laser beam is irradiated onto the optical disc 1. .

The entire optical pickup 5 can be moved in the sledge direction by a seek motor (not shown). The focus actuator, the track actuator, and the seek motor are laser-received by the motor driver 3 and the servo processing unit 4 based on the servo signals such as the focus error signal (FE) and the track error (TE) signal obtained from the light receiving element and the position sensor. The spot is controlled so that it is located at the destination.

When reading data, the optical pickup 5
The reproduced signal obtained in step 2 is amplified by the read amplifier 6 and binarized (digitized), and then input to the CD decoder 7 and E
FM demodulated. EFM is Eight to Fourteen Modulati
In the abbreviation of "on", data obtained by modulating 8-bit data into 14-bit data is written on the optical disc 1 for easy optical reproduction or recording. The EFM demodulated data is subjected to deinterleaving (reordering) and error correction.

Thereafter, this data is stored in the buffer manager 8
Then, the data is temporarily stored in the buffer RAM 9, and when the sector data is prepared, the data is collectively sent to the host computer through the interface 10 which is performed with ATAPI or SCSI. In the case of music data, the data output from the CD decoder 7 is input to the D / A converter 11 and an analog audio signal is extracted.

At the time of writing data, the data sent from the host is temporarily stored in the buffer RAM 9 by the buffer manager 8 and the writing is started when the data is stored in the buffer to some extent. Before that, the data is prepared in the inner circumference of the optical disc. The optimum recording power is determined (POC [OPTIMUM POWER CONTROL]) in the area where the recording power is present.

Further, the laser spot must be located at the writing start point. This point is obtained from a wobble signal that is previously engraved on the optical disc 1 due to the meandering of the track. The wobble signal includes absolute time information called ATIP (Absolute Time In Pregroove), and the ATIP decoder 12 extracts this information. Further, the sync signal generated by the ATIP decoder 12 is input to the CD encoder 13 to enable writing of data at an accurate position.

The data in the buffer RAM 9 is a CD-ROM
After the error correction code is added and interleaved (sorted) by the encoder 14 (CD-ROM decoder 20) and the CD encoder 13, EFM modulation is performed and the data is recorded on the optical disc 1 via the LD driver 15 and the optical pickup 5. . The recording is performed by the optical pickup 5 by alternately switching the laser beam between the recording beam and the reproducing beam.

The temperature measuring device 16 shown in FIG. 1 comprises a temperature sensor 17 and an A / D converter 18 as shown in FIG.
The temperature sensor 17 is installed in the CDO-R / RW drive and monitors the temperature in the drive. The output end of the temperature sensor 17 is connected to the input end of the A / D converter 18. The A / D converter 18 includes a temperature sensor 17
The temperature information from is input in the form of an analog signal, and the temperature information is converted into a digital signal that can be handled by the system controller 19 by performing analog-digital conversion at any time. The converted temperature information is output to the system controller 19 of the CD-R / RW drive as needed.

The system controller 19, which receives the temperature information, does not carry out the gear shift process if the temperature in the drive does not sufficiently exceed the temperature at which the stable operation of the semiconductor laser and the recording quality of the optical disk 1 are guaranteed.

In addition, from the received temperature information, CD-R /
When it is informed that the internal temperature of the RW drive is likely to exceed the temperature at which the stable operation of the semiconductor laser and the recording quality of the optical disc 1 are guaranteed, the system controller 19 immediately instructs the motor driver 3 to perform low-speed rotation drive. The motor driver 3 drives the spindle motor 2 to rotate at a low speed.

Further, the system controller 19 also gives an instruction to the LD driver 15 to cause the laser to send recording with the laser power during low-speed rotation driving. Received this
The LD driver 15 controls the optical pickup 5 so that the laser performs recording with the laser power during low-speed rotation driving. By this series of processes, even if the temperature inside the drive is likely to exceed the temperature at which the stable operation of the semiconductor laser and the recording quality of the optical disc 1 are guaranteed, the temperature inside the drive is prevented from rising by reducing the recording speed.
As a result, stable recording quality can be realized.

The optical recording / reproducing apparatus of the present invention is characterized by a method of decelerating the rotation speed of the optical disc 1. FIG. 3 is a flowchart of the first control example. In recording data on the optical disc 1, the user sets the optical disc 1 on the apparatus and then specifies the recording speed on the apparatus. In response to the instruction, the system controller 19 in the apparatus instructs the motor driver 3 about the rotation speed of the spindle motor 2 for the recording speed specified by the user (S1).

At this time, the system controller 19 also instructs the LD driver 15 to emit light with a laser recording power suitable for the rotation speed of the spindle motor 2. The motor driver 3 drives the spindle motor 2 at the instructed rotation speed (S2). After that, this apparatus records data on the optical disc 1 while causing the laser to emit light in a pulse shape (S3).

At this time, the temperature sensor 17 shown in FIG. 2 sends the temperature information in the apparatus via the A / D converter 18 to the system controller 19 as needed. The system controller 19 receives this temperature information and monitors the temperature rise in this device. If the internal temperature of the device is likely to exceed the temperature (Tth) at which the stable operation of the semiconductor laser and the recording quality of the optical disc 1 are guaranteed at some point (Y in S4), the system controller 19 immediately rotates the spindle motor 2. The speed is reduced to the minimum rotation speed (S5).

The minimum rotation speed is the minimum rotation speed among the rotation speeds that can be rotationally driven by the present apparatus. In this case 1
Suppose it is double speed. At this time, the system controller 19 also instructs the LD driver 15 to emit light with a laser recording power suitable for the rotation speed of the spindle motor 2. The apparatus continues recording data, and when there is no more data to be recorded (Y in S6), the operation ends (S7).

FIG. 4 is a flow chart of the second control example. In recording data on the optical disc 1, the user sets the optical disc 1 on the apparatus and then specifies the recording speed on the apparatus. In response to the instruction, the system controller 19 in the apparatus instructs the motor driver 3 about the rotation speed of the spindle motor 2 for the recording speed specified by the user (S1).

At this time, the system controller 19 also instructs the LD driver 15 to emit light with a laser recording power suitable for the rotation speed of the spindle motor 2. The motor driver 3 drives the spindle motor 2 at the instructed rotation speed (S2). After that, this apparatus records data on the optical disc 1 while causing the laser to emit light in a pulse shape (S3).

At this time, the temperature sensor 17 shown in FIG. 2 sends the temperature information in the apparatus via the A / D converter 18 to the system controller 19 at any time. The system controller 19 receives this temperature information and monitors the temperature rise in this device. If the internal temperature of the device is likely to exceed the temperature (Tth) at which the stable operation of the semiconductor laser and the recording quality of the optical disc 1 are guaranteed at some point (Y in S4), the system controller 19 immediately rotates the spindle motor 2. The speed is reduced to the minimum rotation speed (S5).

The minimum rotation speed is the minimum rotation speed among the rotation speeds at which this apparatus can be driven to rotate. In this case 1
Suppose it is double speed. At this time, the system controller 19 also instructs the LD driver 15 to emit light with a laser recording power suitable for the rotation speed of the spindle motor 2.

While continuing to record data, the present apparatus instructs the motor driver 3 to gradually increase the rotation speed gradually after the temperature inside the apparatus has sufficiently decreased (S).
6). At this time, the system controller 19 also instructs the LD driver 15 to emit light with a laser recording power suitable for the rotation speed of the spindle motor 2. Further, the temperature sensor 17 of FIG. 2 sends the temperature information in the apparatus via the A / D converter 18 to the system controller 19 as needed. The system controller 19 receives this temperature information and monitors the temperature rise in this device.

At this time, for example, the operation of gradually increasing the rotation speed is performed n times, and the internal temperature of the device is set to the semiconductor laser at the rotation speed V (n) set at the nth time of the operation of increasing the rotation speed. When the system controller 19 detects from the temperature information from the temperature sensor 17 of FIG. 2 that stable operation and the recording quality of the optical disc 1 are about to exceed the guaranteed temperature (Tth) (Y in S7), the system controller 19 Immediately, the motor driver 3 is instructed to shift the rotation speed of the spindle motor 2 from the current rotation speed V (n) to the rotation speed V (n-1) which is one step lower.

At this time, the system controller 19 also instructs the LD driver 15 to emit light with a laser recording power suitable for the rotation speed of the spindle motor 2. Upon receiving the instruction, the motor driver 3 changes the rotation speed of the spindle motor 2 as instructed (S8). Data recording is continued while repeating this series of operations, and when there is no more data to be recorded (Y in S9), the operation ends (S10).

FIG. 5 is a flow chart of the third control example. In recording data on the optical disc 1, the user sets the optical disc 1 on the apparatus and then specifies the recording speed on the apparatus. In response to the instruction, the system controller 19 in the apparatus instructs the motor driver 3 about the rotation speed of the spindle motor 2 for the recording speed specified by the user (S1).

At this time, the system controller 19 also instructs the LD driver 15 to emit light with a laser recording power suitable for the rotation speed of the spindle motor 2. The motor driver 3 rotates the spindle motor 2 at the designated rotation speed.
Is driven (S2). After that, this apparatus records data on the optical disc 1 while causing the laser to emit light in a pulse shape (S3).

At this time, the temperature sensor 17 shown in FIG. 2 sends the temperature information in the apparatus via the A / D converter 18 to the system controller 19 at any time. The system controller 19 receives this temperature information and monitors the temperature rise in this device. If the internal temperature of the device is likely to exceed the temperature (Tth) at which the stable operation of the semiconductor laser and the recording quality of the optical disc 1 are guaranteed at some point (Y in S4), the system controller 19 immediately rotates the spindle motor 2. The speed is reduced to a sufficiently low rotation speed (S5).

A sufficiently low rotational speed means that at each rotational speed at which the present apparatus can be rotationally driven (for example, 1x, 2x, 4x, 6x,
8x, 12x, 16x, 20x can be rotationally driven) within a rotation speed at which the internal temperature of the device surely drops to a temperature level at which stable operation of the semiconductor laser and the recording quality of the optical disk 1 are sufficiently guaranteed (for example, by At the time of shipment of the device, the temperature rise in the device during the data recording process at each rotation speed is measured in advance, and the temperature level at which the recording quality of the optical disc 1 is sufficiently guaranteed at the speed of 1x, 2x, 4x is reached. It is the fastest rotation speed, assuming that it has decreased. In this case, the speed is 4 times.

At this time, the system controller 19 also instructs the LD driver 15 to emit light with a laser recording power suitable for the rotation speed of the spindle motor 2. The apparatus continues recording data, and when there is no more data to be recorded (Y in S6), the operation ends (S7).

FIG. 6 is a flow chart of the fourth control example. In recording data on the optical disc 1, the user sets the optical disc 1 on the apparatus and then specifies the recording speed on the apparatus. In response to the instruction, the system controller 19 in the apparatus instructs the motor driver 3 about the rotation speed of the spindle motor 2 for the recording speed specified by the user (S1).

At this time, the system controller 19 also instructs the LD driver 15 to emit light with a laser recording power suitable for the rotation speed of the spindle motor 2. The motor driver 3 drives the spindle motor 2 at the instructed rotation speed (S2). After that, this apparatus records data on the optical disc 1 while causing the laser to emit light in a pulse shape (S3).

At this time, the temperature sensor 17 of FIG. 2 sends the temperature information in the apparatus via the A / D converter 18 to the system controller 19 at any time. The system controller 19 receives this temperature information and monitors the temperature rise in this device. If the internal temperature of the device is likely to exceed the temperature (Tth) at which the stable operation of the semiconductor laser and the recording quality of the optical disc 1 are guaranteed at some point (Y in S4), the system controller 19 immediately rotates the spindle motor 2. The speed is reduced to a sufficiently low rotation speed (S5).

A sufficiently low rotational speed means that at each rotational speed at which the present apparatus can be rotationally driven (for example, 1x, 2x, 4x, 6x,
8x, 12x, 16x, 20x can be rotationally driven) within a rotation speed at which the internal temperature of the device surely drops to a temperature level at which stable operation of the semiconductor laser and the recording quality of the optical disk 1 are sufficiently guaranteed (for example, by At the time of shipment of the device, the temperature rise in the device during the data recording process at each rotation speed is measured in advance, and the temperature level at which the recording quality of the optical disc 1 is sufficiently guaranteed at the speed of 1x, 2x, 4x is reached. It is the fastest rotation speed, assuming that it has decreased. In this case, the speed is 4 times.

At this time, the system controller 19 also instructs the LD driver 15 to emit light with a laser recording power suitable for the rotation speed of the spindle motor 2.

While continuing to record data, the present apparatus instructs the motor driver 3 to gradually increase the rotation speed gradually after the temperature inside the apparatus has sufficiently decreased (S).
6). At this time, the system controller 19 also instructs the LD driver 15 to emit light with a laser recording power suitable for the rotation speed of the spindle motor 2. Further, the temperature sensor 17 of FIG. 2 sends the temperature information inside the apparatus via the A / D converter 18 to the system controller 19 at any time. The system controller 19 receives this temperature information and monitors the temperature rise in this device.

At this time, for example, the operation of gradually increasing the rotation speed is performed n times, and the internal temperature of the device is set to the semiconductor laser at the rotation speed V (n) set at the nth time of the operation of increasing the rotation speed. When the system controller 19 detects from the temperature information from the temperature sensor 17 of FIG. 2 that stable operation and the recording quality of the optical disc 1 are about to exceed the guaranteed temperature (Tth) (Y in S7), the system controller 19 Immediately, the motor driver 3 is instructed to shift the rotation speed of the spindle motor 2 from the current rotation speed V (n) to the rotation speed V (n-1) which is one step lower.

At this time, the system controller 19 also instructs the LD driver 15 to emit light with a laser recording power suitable for the rotational speed of the spindle motor 2. The motor driver 3 that received the instruction is the spindle motor 2 as instructed.
The rotational speed of is changed (S8). Data recording is continued while repeating this series of operations, and when there is no more data to be recorded (Y in S9), the operation ends (S10).

FIG. 7 is a flowchart of the fifth control example. In recording data on the optical disc 1, the user sets the optical disc to the present apparatus and then specifies the recording speed to the present apparatus. In response to the instruction, the system controller 19 in the apparatus instructs the motor driver 3 about the rotation speed of the spindle motor 2 for the recording speed specified by the user (S1).

At this time, the system controller 19 also instructs the LD driver 15 to emit light with a laser recording power suitable for the rotation speed of the spindle motor 2. The motor driver 3 drives the spindle motor 2 at the instructed rotation speed (S2). After that, this apparatus records data on the optical disc 1 while causing the laser to emit light in a pulse shape (S3).

At this time, the temperature sensor 17 shown in FIG. 2 sends the temperature information in the apparatus via the A / D converter 18 to the system controller 19 as needed. The system controller 19 receives this temperature information and monitors the temperature rise in this device. If the internal temperature of the device is likely to exceed the temperature (Tth) at which the stable operation of the semiconductor laser and the recording quality of the optical disc 1 are guaranteed at some point (Y in S4), the system controller 19 immediately rotates the spindle motor 2. The speed is reduced to a rotation speed that is one step lower (S5).

The one-step slower rotational speed means that among the rotational speeds at which the present apparatus can be rotationally driven (for example, 1x, 2x, 4x, 6x,
8x, 12x, 16x, 20x) (Rotating speed can be 8x, 12x, 16x, 20x) Rotation speed of the spindle motor 2 that is specified by the user (for example, 20x) is one speed slower (for example, 16x).
That is. At this time, the system controller 19 also instructs the LD driver 15 to emit light with a laser recording power suitable for the rotation speed of the spindle motor 2. The apparatus continues recording data, and when there is no more data to be recorded (Y in S6), the operation ends (S7).

FIG. 8 is a flowchart of the sixth control example. In recording data on the optical disc 1, the user sets the optical disc 1 on the apparatus and then specifies the recording speed on the apparatus. In response to the instruction, the system controller 19 in the apparatus instructs the motor driver 3 about the rotation speed of the spindle motor 2 for the recording speed specified by the user (S1).

At this time, the system controller 19 also instructs the LD driver 15 to emit light with a laser recording power suitable for the rotation speed of the spindle motor 2. The motor driver 3 rotates the spindle motor 2 at the designated rotation speed.
Is driven (S2). After that, this apparatus records data on the optical disc 1 while causing the laser to emit light in a pulse shape (S3).

At this time, the temperature sensor 17 of FIG. 2 sends the temperature information in the apparatus via the A / D converter 18 to the system controller 19 at any time. The system controller 19 receives this temperature information and monitors the temperature rise in this device. If the internal temperature of the device is likely to exceed the temperature (Tth) at which the stable operation of the semiconductor laser and the recording quality of the optical disc 1 are guaranteed at some point (Y in S4), the system controller 19 immediately rotates the spindle motor 2. The speed is reduced to a rotation speed that is one step lower (S5).

The one-step slower rotational speed means that among the rotational speeds at which the present apparatus can be rotationally driven (for example, 1x, 2x, 4x, 6x,
8x, 12x, 16x, 20x) (Rotating speed can be 8x, 12x, 16x, 20x) Rotation speed of the spindle motor 2 that is specified by the user (for example, 20x) is one speed slower (for example, 16x).
That is. At this time, the system controller 19 also instructs the LD driver 15 to emit light with a laser recording power suitable for the rotation speed of the spindle motor 2.

Further, the temperature sensor 17 of FIG. 2 sends the temperature information in the apparatus via the A / D converter 18 to the system controller 19 at any time. The system controller 19 receives this temperature information and monitors the temperature rise in this device. Even at this time, if the internal temperature of the device is likely to exceed the temperature (Tth) at which the stable operation of the semiconductor laser and the recording quality of the optical disc 1 are guaranteed (Y in S6), the system controller 19 immediately rotates the spindle motor 2. The speed is reduced to a rotation speed one step lower than the current rotation speed (S5).

At this time, the system controller 19 also instructs the LD driver 15 to emit light with a laser recording power suitable for the rotation speed of the spindle motor 2.

Further, the temperature sensor 17 of FIG. 2 sends the temperature information in the apparatus via the A / D converter 18 to the system controller 19 at any time. The system controller 19 receives this temperature information and monitors the temperature rise in this device. This operation is surely performed until the internal temperature of the apparatus is lowered to a temperature level at which the stable operation of the semiconductor laser and the recording quality of the optical disc 1 are sufficiently guaranteed. The apparatus continues recording data, and when there is no more data to be recorded (Y in S7), the operation ends (S8).

[0066]

According to the first aspect of the present invention, the light source that emits light for irradiating the recordable optical disk having a constant recording linear density, the rotation driving means that rotationally drives the optical disk, and the rotation driving means are provided in a predetermined manner. Rotation speed control means for controlling the speed, temperature information acquisition means for obtaining the internal temperature, and a system for controlling the rotation speed control means so that the rotation drive means rotates the optical disk at the rotation speed according to the obtained temperature. Since the control means is provided, it is possible to avoid deterioration of recording accuracy due to temperature rise and shortening of the life of the apparatus.

According to the second aspect of the invention, when the temperature in the apparatus is likely to exceed the temperature at which the stable operation of the semiconductor laser and the recording quality of the optical disk are guaranteed, the rotational speed of the optical disk is immediately controlled to the minimum rotational speed drive control. By doing so, the power consumption of the device can be reduced and the temperature inside the device can be lowered. Therefore, it is possible to avoid deterioration of recording accuracy and shortening of the life of the apparatus due to temperature rise.

According to the third aspect of the invention, when the temperature in the apparatus is likely to exceed the temperature at which the stable operation of the semiconductor laser and the recording quality of the optical disk are guaranteed, the rotational speed of the optical disk is immediately controlled to the minimum rotational speed. By doing so, the power consumption of the device can be reduced and the temperature inside the device can be lowered. In addition, the recording / reproducing efficiency is improved by gradually changing the rotational speed to a high speed drive thereafter.

According to the fourth aspect of the invention, when the temperature in the apparatus is likely to exceed the temperature at which the stable operation of the semiconductor laser and the recording quality of the optical disk are guaranteed, the rotational speed of the optical disk is immediately sufficiently low. By controlling the drive, the power consumption of the device can be reduced and the temperature inside the device can be lowered.

According to the fifth aspect of the invention, when the temperature inside the apparatus is likely to exceed the temperature at which the stable operation of the semiconductor laser and the recording quality of the optical disk are guaranteed, the rotational speed of the optical disk is immediately sufficiently low. By controlling the drive, the power consumption of the device can be reduced and the temperature inside the device can be lowered. In addition, the recording / reproducing efficiency is improved by gradually changing the rotational speed to a high speed drive thereafter.

According to the sixth aspect of the present invention, when the temperature inside the apparatus is likely to exceed the temperature at which the stable operation of the semiconductor laser and the recording quality of the optical disk are guaranteed, the rotational speed of the optical disk is immediately changed to the current rotational speed. By controlling the rotation speed drive at a lower speed by one step, it is possible to reduce the power consumption of the device and lower the temperature inside the device.

According to the seventh aspect of the invention, when the temperature inside the apparatus is likely to exceed the temperature at which the stable operation of the semiconductor laser and the recording quality of the optical disk are guaranteed, the rotational speed of the optical disk is immediately changed to the current rotational speed. It is possible to reduce the temperature inside the device by reducing the power consumption of the device by controlling the rotational speed drive at a lower speed by one step.

At this point, even if the rotation speed is reduced by one step, if the temperature inside the device does not drop to a temperature at which the stable operation of the semiconductor laser and the recording quality of the optical disk are sufficiently guaranteed, the rotation is restarted. Shift the speed one step lower. This shift control is performed until the temperature inside the device decreases to a temperature at which the stable operation of the semiconductor laser and the recording quality of the optical disc are sufficiently ensured, so that an optical disc of higher recording quality can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram of an optical recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a configuration block diagram of the temperature measuring device shown in FIG.

FIG. 3 is a flowchart of a first control example.

FIG. 4 is a flowchart of a second control example.

FIG. 5 is a flowchart of a third control example.

FIG. 6 is a flowchart of a fourth control example.

FIG. 7 is a flowchart of a fifth control example.

FIG. 8 is a flowchart of a sixth control example.

[Explanation of symbols] 1 optical disc 2 Spindle motor (rotation drive means) 3 Motor driver (rotation speed control means) 4 Servo processing unit (rotational speed control means) 5 Optical pickup (light source) 16 Temperature measurement device (temperature information acquisition means) 19 system controller (system control means)

Claims (7)

[Claims] 1. A light source that emits light for irradiating a recordable optical disc having a constant recording linear density, a rotation driving unit that rotationally drives the optical disc, and a rotation speed control unit that controls the rotation driving unit to a predetermined speed. A temperature control unit for controlling the rotation speed control unit so that the rotation driving unit rotates the optical disk at a rotation speed according to the calculated temperature; Optical recording / reproducing device. 2. When the temperature in the apparatus is likely to exceed the temperature at which a stable recording operation is guaranteed, the control of the rotation speed control means performed based on the command of the system control means,
2. The optical recording / reproducing apparatus according to claim 1, wherein the rotation driving means immediately changes the speed to the lowest rotation speed. 3. When the temperature in the apparatus is likely to exceed the temperature at which a stable recording operation is guaranteed, the control of the rotation speed control means performed based on the command of the system control means,
2. The optical recording / reproducing apparatus according to claim 1, wherein the rotation driving means immediately shifts to the minimum rotation speed and then gradually shifts the rotation speed to high speed. 4. When the temperature in the apparatus is likely to exceed the temperature at which a stable recording operation is guaranteed, the control of the rotation speed control means performed based on the command of the system control means,
2. The optical recording / reproducing apparatus according to claim 1, wherein the rotation driving means immediately shifts to a sufficiently low rotation speed driving. 5. When the temperature in the apparatus is likely to exceed the temperature at which a stable recording operation is guaranteed, the control of the rotation speed control means performed based on the command of the system control means,
2. The optical recording / reproducing apparatus according to claim 1, wherein the rotation driving means immediately shifts the rotation speed to a sufficiently low rotation speed and then gradually shifts the rotation speed to a high speed drive. 6. The rotation drive means immediately shifts to a rotation speed drive one step lower when the temperature in the apparatus is likely to exceed the temperature at which a stable recording operation is guaranteed. The optical recording / reproducing apparatus described. 7. When the temperature in the apparatus is likely to exceed the temperature at which a stable recording operation is guaranteed, the control of the rotation speed control means performed based on the command of the system control means,
The rotation drive means immediately shifts to one rotation speed lower rotation speed drive, and then gradually shifts to low speed drive step by step until the temperature inside the device reaches a temperature at which stable recording operation is sufficiently guaranteed. The optical recording / reproducing apparatus according to claim 1, wherein the optical recording / reproducing apparatus is used.