JPH02101674A - Information recording and reproducing device - Google Patents

Abstract

PURPOSE:To surely protect recording information by ejecting a recording medium outside a device when the temperature of the medium exceeds a prescribed value. CONSTITUTION:The resistance temperature change of a thermistor 1 due to a temperature is taken out as the inter-terminal voltage of a voltage conversion resistor 2, and is inputted to a CPU 4 via an A/D conversion part 3, and a medium temperature is compared with a normal temperature. When a possibility to destroy the recording medium by the excess of the medium temperature over the normal temperature exists, an operation under execution is stopped. The driving states of a laser and a servo are checked, and the CPU 4 stops the laser 6 when it is being driven by sending a command to a CPU 5. Also, when a servo system is being driven, a servo part 7 is stopped by sending a servo stopping instruction. Next, when a spindle motor 8 is being driven, the CPU 4 stops the motor 8. When it is recognized that the medium can be ejected by the CPU 4, a medium ejection instruction is sent to a motor control part 9, then, the medium 13 is ejected by a crank bar 11.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a device for recording and/or reproducing information on a recording medium loaded into the device, and in particular, by monitoring the temperature of the medium. The present invention relates to an information recording and reproducing device configured to prevent changes and disappearance of information.

[Prior Art] In recent years, there has been active development of optical information processing devices that record or reproduce information at high density by irradiating an optical recording medium with a light beam. As such an optical recording medium, there is a write-once (Write 0nce, hereinafter referred to as W) that allows additional writing by - degrees.
Type recording media (denoted as O) and erasable recording media using magneto-optical or phase change technology are known. Recording and reproduction of information will be explained below using a magneto-optical disk as an example.

A magneto-optical disk consists of a magnetic thin film having an axis of easy magnetization perpendicular to the film surface formed on a substrate, and information is recorded by changing the magnetization direction of the magnetic thin film. During recording, the magnetization direction of the magnetic thin film is first aligned in one direction, and a laser beam digitally modulated in accordance with an information signal is irradiated while applying a bias magnetic field in the opposite direction to the magnetization direction. Then, the temperature of the area irradiated by the laser beam rises to near the Curie point, the coercive force decreases, and the area is magnetized in the opposite direction to the surrounding area due to the influence of the bias magnetic field, forming a magnetization pattern according to the information. .

Information recorded in this manner can be optically read out using the well-known magneto-optic effect by irradiating the medium with a low-power unmodulated beam. Furthermore, recorded information can also be erased by applying a magnetic field in the opposite direction to the bias magnetic field during recording.

The optimal laser power for recording, reproducing, and erasing is different, and is set to, for example, 6 mW for erasing power, 4 mW for recording power, and 1 mW for reproducing power.

On the other hand, the recording medium as mentioned above, especially the optical 6B recording medium,
When the medium temperature exceeds a predetermined temperature, the recorded information changes or disappears due to changes in the material itself. Therefore, conventional devices are configured to protect information by detecting the temperature of the medium and reducing the irradiation laser power when the detected temperature exceeds a predetermined value.

[Problem that the invention seeks to solve] However,
Even with conventional equipment that monitors media temperature, if the temperature rises further, information changes or disappears even if the media is placed inside the equipment, even if the laser beam is not irradiated. There was fear.

[Means for solving the problem] However, when the temperature of the medium exceeds a predetermined value, the recording medium is automatically ejected from the device, thereby ensuring the protection of recorded information. It is.

[Example] Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a schematic diagram showing an embodiment of the information recording/reproducing apparatus of the present invention. In the figure, 1 is a thermistor for temperature detection, 2 is a resistor for converting the resistance change of the thermistor 1 due to temperature change into voltage, 3 is an A/[) conversion unit, 4
5 is a first CPU for sequence control; 5 is a second CPU that controls a laser and servo system; 6 is a laser system; 7 is a servo system; 8 is a spindle motor system; 9 is a control unit 510 for a medium ejection motor. is the motor for media ejection,
11 is a crank rod for driving a medium, 12 is a medium when inserted into the device, 13 is a medium when discharged from the device, 14
indicates power supply.

FIGS. 2A and 2B show the sequence from temperature detection to stopping the operation in progress and discharging the medium.

The temperature of the medium is measured during the main program as shown in FIG. 2A.

Here, first, the resistance change of the thermistor due to temperature is extracted as the voltage between the terminals of the voltage conversion resistor 2, and inputted to the A/D conversion section 3. The sequence control CPU 4 is
The medium temperature is recognized from the output data of the A/D converter 3.

On the main program, the medium temperature described above is compared with specified temperature data set in the program, and when the medium temperature exceeds the specified temperature, an interrupt is generated and processing is transferred to the interrupt program.

FIG. 2A shows the processing flow of the interrupt program. In the interrupt program, first, in step 1, it is determined whether the medium temperature is in a state that will cause immediate destruction of recorded information. If there is a possibility of destruction of recorded information, the program proceeds to step 2 and immediately stops the operation being executed. let Otherwise, proceed to step 3 and wait until the operation in progress is completed.

After the operation being executed is stopped or completed, in step 4, the driving states of the laser and servo are checked.

As a result of the determination, first, if the laser is being driven, in step 5, the sequence control CPU 4 sends a command to stop part of the laser to the laser servo control CPU 5, and the part 6 of the laser is stopped.

Also, if the servo system is being driven in step 4, a servo stop command is sent to the servo unit 7, just as in the case of a laser.
to stop.

In step 6, the driving state of the spindle motor is checked. If the spindle motor is being driven, the sequence control CPU 4 stops the spindle motor 8 in step 7.

In the processing from step 4 to step 7, the sequence control CPU 4 indicates that the medium can be ejected.
If it is recognized, the process proceeds to step 8 and the medium is ejected.

The medium is ejected by issuing a medium ejection command from the sequence control CPU 4 to the motor control section 9. Upon receiving the command, the motor control section 9 drives the motor 10 and discharges the medium using the crank rod 11.

After the above series of processing, the sequence control CPU
In step 9, a warning that the medium temperature has exceeded the specified value is displayed to the outside, and the interrupt processing is terminated.

[Effects of the Invention] As explained above, according to the present invention, when the medium temperature exceeds a predetermined value, the medium is discharged from the apparatus. (1) The temperature inside the apparatus becomes abnormal. Even if the temperature rises, the recorded information can be reliably protected.

(2) Since there is no need to control the laser power or adjust the gain of the servo system associated with it, the device can be easily controlled in terms of circuit configuration and software.

The following effects were obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the information recording and reproducing apparatus of the present invention, and FIGS. 2A and 2B are flowcharts each illustrating the operation of the apparatus shown in FIG. DESCRIPTION OF SYMBOLS 1... Thermistor for temperature detection, 2... Resistor for voltage conversion, 3... A/D conversion part, 4... Sequence control CPU. 5... Laser/servo system control CPU. 6...Laser system, 7...Servo system, 8...Spindle motor system, 9...Motor control unit, 10...Motor, 1...Crank bar, 2...During insertion Medium, 3...Medium at the time of ejection, 4...Power source.

Claims (3)

[Claims] (1) In a device that records and/or reproduces information on a recording medium loaded into the device, there is a means for detecting the temperature of the medium, and when the detected temperature exceeds a predetermined value, the device detects the temperature of the medium. 1. An information recording and reproducing device characterized by comprising: a means for ejecting the information to the outside. (2) The information recording and reproducing apparatus according to claim 1, wherein when the detected temperature exceeds a predetermined value during a recording or reproducing operation, the operation is immediately stopped and the medium is ejected. (3) The information recording and reproducing apparatus according to claim 1, wherein when the detected temperature exceeds a predetermined value during a recording or reproducing operation, the medium is ejected after the operation is completed.