JP3166997B2 - Optical information recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording / reproducing apparatus for recording and reproducing information optically by irradiating a light beam, and more particularly to a protection apparatus for protecting data on a recording medium from temperature. .

[0002]

2. Description of the Related Art Conventionally, in an optical information recording / reproducing apparatus of this type, when the temperature in the apparatus becomes high, information cannot be recorded correctly on a recording medium, or recorded data may be destroyed. That is, the characteristics of a recording medium such as an optical disk are deteriorated by temperature, and in an environment where the temperature is equal to or higher than a predetermined value, a recording failure occurs or data is destroyed as described above. Therefore, as a device for solving such a problem, there is known a device which detects a temperature in the device by a temperature sensor and generates an alarm such as an alarm sound when the temperature exceeds a predetermined value.

[0003]

However, in the above-mentioned conventional protection device, an alarm is only issued when the temperature exceeds a predetermined value. Therefore, even if the temperature inside the device does not reach the predetermined value, the high-temperature state is maintained. If the recording is continued for a long time, information may not be recorded correctly or recorded data may be destroyed. Also, it is generally said that recording media such as optical discs can store recorded data for 10 years or more. However, if the device is frequently accessed and used for a long time in a high-temperature state, the data on the recording media will be longer than the life expectancy. There was a risk of disappearing quickly.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to integrate a time and a temperature after the temperature in the apparatus becomes equal to or more than a predetermined time, and to suppress a rise in the temperature in the apparatus when the value becomes equal to or more than a predetermined value. An object of the present invention is to provide an optical information recording / reproducing apparatus which can control data of a recording medium from temperature by controlling.

[0006]

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide an optical information recording / reproducing apparatus for recording information or reproducing recorded information by irradiating an optical information recording medium with a light beam. Temperature detecting means for detecting, a time measuring means for measuring a time from when the detected value of the temperature detecting means reaches a predetermined temperature, and integrating the measured value of the time measuring means and the detected value of the temperature detecting means. The optical information recording / reproducing apparatus further comprises control means for controlling the temperature rise in the apparatus when the integrated value reaches a predetermined value.

[0008]

Embodiments of the present invention will be described below. FIG. 1 is a block diagram showing one embodiment of the optical information recording / reproducing apparatus of the present invention. In FIG. 1, reference numeral 1 denotes an optical sensor for detecting light reflected from a recording medium such as an optical disk (not shown). As the optical sensor 1, a four-division optical sensor whose detection surface is divided into four is used.
The optical sensor 1 is provided in an optical head (not shown). The optical sensor 1 generates an information reproduction signal based on the detection signals of the four detection pieces and controls the tracking of the light beam applied to the recording medium. And focus control is performed. In the optical head, in addition to the optical sensor 1, a semiconductor laser as a recording / reproducing light source, an objective lens for narrowing a light beam of the semiconductor laser to a minute light spot and condensing it on a recording medium, and an objective lens for the objective lens A tracking actuator and a focus actuator are provided for driving in the tracking direction and the focusing direction, respectively, and performing tracking control and focus control.

Reference numeral 2 denotes an A / D converter for digitizing a detection signal of the optical sensor 1, and 3 a CPU for controlling various parts of the apparatus to control recording and reproducing operations of information.
It is. Specifically, the CPU 3 uses the A / D converter 2
The tracking control and the focus control are performed based on the detection signal of the optical sensor 1 taken in at the step S. When the optical head seeks, the seek control is performed so that the speed of the optical head follows a predetermined speed profile. . in this case,
A drive signal is output from the CPU 3 to the linear motor 5 via the D / A converter 4, whereby the seek speed of the optical head is controlled. Further, the CPU 3 controls a laser control circuit (not shown) for driving a semiconductor laser at the time of recording information, thereby controlling the recording operation of the information. At the time of reproducing the information, a predetermined signal is detected based on the detection signal of the optical sensor 1. Playback data is generated by performing signal processing.

Reference numeral 6 denotes a timer circuit for measuring the time from when the recording medium is loaded into the apparatus, and reference numeral 7 denotes a timer circuit for measuring the time from when the temperature in the apparatus reaches a predetermined temperature. The temperature inside the apparatus is detected by the temperature sensor 9 and is notified to the CPU 3. The clock values of the timer circuits 6 and 7 are output to the CPU 3, and the CPU 3 controls each unit of the device according to the detection value of the temperature sensor 9 and the clock values of the timer circuits 6 and 7. Reference numeral 8 denotes a buzzer for generating an alarm.

Next, a specific operation of the above embodiment will be described with reference to FIG. First, when a recording medium is loaded into the apparatus, loading of the recording medium is detected by a sensor (not shown), and the CPU 3 is notified. CPU3
When the detection signal is received, a start signal is output to the timer circuit 6, and the respective parts are controlled to turn on the semiconductor laser of the light source, and the motor is driven to rotate the recording medium. In this way, the timer circuit 6 starts counting time after the recording medium is loaded, and the apparatus is ready for recording and reproduction. The CPU 3 performs tracking control and focusing based on the detection signal of the optical sensor 1 as described above. Control is performed. Then, when receiving a recording / reproducing command, seek control of the optical head is performed, and a target track is accessed to record or reproduce information.

Here, as the information recording and reproducing operations are continued, the temperature inside the device gradually rises due to the heat generated by each part in the device. FIG. 2 is a diagram showing a change in the temperature inside the apparatus after the recording medium is loaded. The temperature inside the device is detected by the temperature sensor 9 and the detection result is
U3 is notified. The CPU 3 monitors the temperature in the apparatus in this manner, and when the temperature reaches the predetermined temperature α, a start signal is output to the timer circuit 7. As a result, the timer circuit 7 is activated and measures the time from when the temperature reaches the predetermined temperature α. Of course, even after the timer circuit 7 starts counting time, the recording and reproducing operations are continued in the device, and the temperature in the device rises as shown in FIG.

The time measured by the timer circuit 7 is notified to the CPU 3, and the CPU 3 integrates the temperature and time after the temperature reaches the predetermined temperature α. When the integrated value reaches the predetermined value, the temperature rise in the apparatus is suppressed. The control is performed as follows. That is, as shown in FIG. 2, the temperature and the time are integrated from the point B at which the predetermined temperature α is reached, and when the value becomes equal to or more than the predetermined value (corresponding to the area F shown by oblique lines in FIG. 2), the temperature inside the apparatus rises Is suppressed. In FIG. 2, the integrated value exceeds the area F at the point C at which the timer circuit 7 measures the time T ₁ ,
At this point, control for suppressing the temperature rise is performed. Note that the timer circuit 7 is reset at the time point C and is prepared for the next timing.

The CPU 3 lowers the speed of the speed profile used for seek control of the optical head in order to suppress a rise in temperature in the apparatus.
Is controlled so that power consumption is reduced by suppressing the temperature rise and temperature rise is suppressed. At this time, CPU3
By controlling the buzzer circuit (not shown) and sounding the buzzer 8, the user is notified that the seek time of the optical head is longer because the temperature has risen. Also,
In order to suppress the temperature rise in the device, there is a method of recording and reproducing information by lowering the light emission power of a semiconductor laser as a light source. However, in this case, it is necessary to reduce the rotation speed of the motor for rotating the recording medium accordingly. Further, increasing the rotation speed of the cooling fan is also effective.

In this way, the temperature rise in the apparatus is suppressed, and as a result, the temperature gradually decreases as shown in FIG. 2, and drops to a predetermined temperature α at a time point D after a lapse of time T ₂ from the time point C. Until the time point D, the above-described control for suppressing the temperature rise is performed, and thereafter, the control is returned to the normal control. Then, when the temperature rises again and reaches the predetermined temperature α, the timer circuit 7 is started in the same manner, and when the integrated value of the temperature and the time becomes equal to or more than the predetermined value, control for suppressing the temperature rise in the apparatus is performed again. If the temperature in the apparatus has risen to β in FIG. 2, the CPU 3 causes the buzzer 8 to generate a sound different from the previous sound and raises the temperature to a dangerous level for the user. It is notified that there is.

On the other hand, the timer circuit 6 counts the time from the loading of the recording medium as described above.
The buzzer 8 generates a sound different from the two previous sounds to notify the user that the same recording medium has been used for a long time and that the usage time has reached a predetermined time. In other words, when reaching the E point recording medium with time T ₃ from A when it is loaded as shown in FIG. 2, prolonged use of the recording medium is notified by a buzzer 8. At the same time, C
In the PU 3, control is performed to suppress the temperature rise in the apparatus by reducing the speed of the speed profile.

In this embodiment, when the temperature exceeds a predetermined temperature, the temperature and time are integrated, and when the temperature exceeds a predetermined value, control is performed so as to suppress the temperature rise in the apparatus. Therefore, the recording medium can be reliably prevented from being used at a high temperature without being kept at a high temperature above a certain value determined by the product of In other words, in the above-described conventional apparatus, the recording medium may be kept in a high temperature state for a long time even if the temperature is below a predetermined value. It can be prevented from being placed under high temperature. Therefore, it is possible to prevent the recording medium from being exposed to a high temperature for a long period of time, thereby preventing the characteristic of the recording medium from deteriorating. Can be protected.

Further, the same recording medium can be kept at a high temperature for a long period of time by measuring the time from the loading of the recording medium and notifying the user when the time reaches a predetermined time. Can be prevented. Therefore, if the time to be measured is set before the life of the recording medium, that is, it is generally said that the life of data storage of the recording medium is 10 years or more, but it is shorter when used in a high temperature state. Also, by setting the time with a sufficient margin, it is possible to notify the user before the life of the recording medium, and it is possible to prevent a situation in which data on the recording medium is lost.

Further, the time since the recording medium was loaded by the disc eject command is recorded in a specific area of the recording medium, and this time data is read out when the recording medium is loaded. The timer circuit 6 uses this numerical value as an initial value. By starting the timing, it is possible to generate an alarm during the total loading time. That is, if the entire loading time of the medium is stored in a specific area of the recording medium and an alarm is generated when the entire loading time reaches a specified value, the recording medium can be used in a relatively short time. Even in such a case, an alarm can be issued when the entire loading time reaches a specified value, so that the same recording medium can be similarly prevented from being kept at a high temperature for a long time.

FIG. 3 is a block diagram showing another embodiment of the present invention. Although the temperature inside the apparatus is detected by the temperature sensor 9 in the embodiment of FIG. 1, this embodiment is an example in which the temperature is indirectly measured by an error rate. In FIG. 3, reference numeral 10 denotes a display circuit provided in place of the buzzer, 11 denotes a laser control circuit, and 12 denotes a semiconductor laser as a recording / reproducing light source. Further, 13 is a spindle control circuit, 14 is a spindle motor for driving the recording medium to rotate, and 15 is a cooling fan.

When measuring the error rate, the CPU 3
Then, each part is controlled to perform a write test on a predetermined area of the recording medium. The signal subjected to the write test is transmitted to the CPU 3
The reproduction is immediately performed by the control of, and the error rate is calculated based on the result. The measurement of the error rate is repeated at regular intervals after the recording medium is loaded, and when the level reaches a predetermined value α as shown in FIG. 4, an activation signal is output from the CPU 3 to the timer circuit 7. Here, since the error rate depends on the temperature, FIG.
The error rate corresponding to the predetermined temperature in the embodiment is set as the predetermined error rate, and when the error rate reaches this value, the timer circuit 7 is activated and the time measurement is started as in FIG. The error rate is a level that can be corrected by an error correction circuit (not shown).

When the timer circuit 7 is started, the CPU 3 measures the error rate at regular intervals, integrates the error rate and time as shown in FIG. 4, and sets the value to a predetermined value (shown by hatching in FIG. 4). When the area becomes F), control is performed so as to suppress a rise in the temperature inside the apparatus, similarly to the embodiment of FIG. That is, control is performed such that the spindle control circuit 13 is controlled to reduce the rotation speed of the spindle motor 14, and the laser control circuit 11 is controlled to reduce the power of the semiconductor laser to record and reproduce information. At this time,
The display circuit 4 indicates that the recording / reproduction is being performed slowly by lowering the rotation speed of the recording medium. In addition, Fan 1
The control is performed so as to increase the rotation speed of 5 and cool the inside of the apparatus. It is also effective to reduce the seek speed of the optical head as described with reference to FIG.

In this way, the temperature rise in the apparatus is suppressed, and the temperature in the apparatus gradually decreases as shown in FIG. When the error rate decreases to the predetermined value α, the control for suppressing the temperature rise as described above is released, and the control is returned to the original normal control again. Of course, the timer circuit 7 is reset to prepare for timing of the next temperature rise. Thus, also in this embodiment, similarly to the embodiment of FIG. 1, it is possible to prevent the recording medium from being exposed to a high temperature for a long time, and to surely protect the data of the recording medium.
Further, since the temperature is detected by measuring the error rate, a temperature sensor is not required, and the configuration can be simplified accordingly.

[0024]

As described above , according to the present invention , the device
The temperature and time after the temperature inside the
Integrates, and when the value exceeds a predetermined value, the temperature inside the device
Control to suppress the temperature rise,
It can prevent recording media from being exposed to high temperatures for a long time,
The effect that the data on the medium can be protected reliably
There is .

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of an optical information recording / reproducing apparatus of the present invention.

FIG. 2 is a diagram for explaining the operation of the embodiment of FIG. 1;

FIG. 3 is a block diagram showing another embodiment of the present invention.

FIG. 4 is a diagram for explaining the operation of the embodiment in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical sensor 2 A / D converter 3 CPU 4 D / A converter 5 Linear motor 6,7 Timer circuit 8 Buzzer 9 Temperature sensor 10 Display circuit 12 Semiconductor laser 14 Spindle motor 15 Fan

Claims (6)

(57) [Claims] 1. An optical information recording / reproducing apparatus for recording information or reproducing recorded information by irradiating an optical information recording medium with a light beam, and a temperature detecting means for detecting a temperature inside the apparatus. A timer for measuring the time from when the value detected by the temperature detector reaches a predetermined temperature; and integrating the time measured by the timer and the value detected by the temperature detector, and the integrated value reaches a predetermined value. An optical information recording / reproducing apparatus, comprising: a control unit for performing control so as to suppress a temperature rise in the apparatus when the temperature rises. 2. The optical information recording / reproducing apparatus according to claim 1, wherein said temperature detecting means is a temperature sensor provided in the apparatus. 3. The temperature detecting means includes means for performing a write test on a predetermined area of the recording medium, means for reproducing a signal subjected to the write test, and means for calculating an error rate from the reproduced result. It becomes, in claim 1, characterized in that for detecting the temperature in the apparatus from the error rate
The optical information recording and reproducing apparatus according. 4. The apparatus according to claim 1, wherein said control means lowers the speed of a speed profile when seeking an optical head for recording and reproducing information, and lowers the speed of a linear motor for driving said optical head. The optical information recording / reproducing apparatus according to claim 1, wherein a temperature rise of the optical information recording / reproducing apparatus is suppressed. 5. The recording / reproducing of information by reducing a rotation speed of a motor for rotating the recording medium and reducing a light emission power of a semiconductor laser for irradiating the recording medium with a light beam. it, the optical information recording and reproducing apparatus according <br/> to claim 1, characterized in that to suppress the temperature rise in the apparatus for performing. 6. The optical information recording / reproducing apparatus according to claim 1, wherein the control unit suppresses a rise in temperature in the apparatus by increasing a rotation speed of a cooling fan of the apparatus.