JP2006172689A - Information recording / reproducing device - Google Patents

Abstract

There is a possibility of damaging a disc because detection of an abnormal mounting of the disc does not have a configuration that can be completed before the recording or reproducing operation is started on the disc.
The spindle is mounted on the lower side of the disk holder while tilting the disk against the urging force of the main bar urging spring for urging the main bar and mounted on the disk positioning recess. The motor 8 is sandwiched between the turntable 7 and the clamper 6. In contrast to such normal mounting, when the disk 9 is placed on the disk holder 4 and placed thereon, the disk holder 4 rotates around the rotation fulcrum 10, and therefore can be sandwiched between the turntable 7 and the clamper 6. By attaching the rubber 5 to the disc holder 6, the number of rotations decreases, so that abnormal attachment can be easily detected.
[Selection] Figure 1

Description

  The present invention relates to various information recording / reproducing apparatuses that use disc-shaped recording media such as CDs and DVDs.

  Information using various disc-shaped recording media (hereinafter referred to as discs) such as compact disc (hereinafter referred to as CD) players, CD drives, digital versatile discs (hereinafter referred to as DVDs) ROM drives, DVD audio players and DVD recorders. The recording / reproducing apparatus is provided with a disk loading apparatus for loading a disk. In this disk loading apparatus, when a disk handled by the information recording / reproducing apparatus is placed on a tray fed out from the apparatus, the tray is automatically moved and stored in the apparatus, and then the turntable that rotates the disk automatically. The mainstream configuration is clamped and ready for recording or playback.

  On the other hand, in recent years, due to space saving, this type of information recording / reproducing apparatus is increasingly installed and used in a state where the surface of the disk is vertical. For this reason, these information recording / reproducing apparatuses are usually designed so that they can be used regardless of whether the disk surface is installed in a horizontal state or in a vertical state. If the disc surface is placed horizontally, there is no problem because the disc is stably placed on the tray. It slides down from the tray and cannot be placed on the tray. For this reason, some protrusions are provided in the vicinity of the outer peripheral portion of the disk of the normal tray so that the disk can be held at substantially the same relative position as when the disk is horizontal with respect to the tray when the disk is mounted by the user. By performing the disk loading operation in this state, the loading operation is performed in substantially the same manner as in the horizontal case. However, in order to enable the disk to be stably mounted in the vertical direction with this configuration, the protrusions must have a shape overhanging near the inside or outside of the outer periphery of the disk.

  In such an overhanged shape, there is no problem when installed vertically, but when this is installed horizontally, when placing the disk on the tray, the disk should be inserted under this protrusion. Therefore, it is impossible to place with a simple operation. If the disc is accidentally placed on the overhanged portion without entering the lower side of the protrusion, the disc is not properly mounted on the tray. As a result, the information recording / reproducing apparatus can not only perform normal recording / reproducing, but in extreme cases, when the disc rotates, the projection and the disc slide to damage the disc and destroy the recorded data of the user. In some cases, the information recording / reproducing apparatus causes a fatal result.

  For this reason, attention is given to the instruction manual of the apparatus, or when the apparatus is installed horizontally, this overhang portion can be stored. However, in such a countermeasure, whether or not the fatal result as described above can be avoided depends on the user's action. Therefore, this is not sufficient.

Conventionally, with respect to such a problem, for example, as described in Patent Document 1, when the rotation of the disk is started, the number of rotations after a certain time from the start of rotation is measured. A method has been proposed in which it is determined whether or not the device is attached to the device, and an appropriate operation is performed when the device is determined to be abnormal. Since the torque of the motor and the moment of inertia of the disk and the rotor of the motor are within a certain range, when the disk is normally mounted, the number of rotations after a certain time from the start of rotation falls within a certain range. When it deviates from this range, it is determined that the disc is not properly mounted, and an operation such as ejecting the tray is performed.
JP 7-176121 A

  However, in Patent Document 1, since the disk is not mounted normally, the disk motor is idling and the rotation speed is higher than a predetermined value. However, the disk is overhanging the protrusion. The disk comes into contact with, for example, a housing of the information recording / reproducing apparatus, and the normal rotational speed is lowered due to the frictional force caused by the contact with the housing or the like. Needless to say, it is possible to detect an abnormality in such a case as well.

  Therefore, in the configuration disclosed in Patent Document 1, when an abnormality is detected even when the rotational speed is low, the above-described document has the following problems.

First, the disk must be rotated to detect abnormalities in the loading of the disk, but this rotation can damage the disk,
Secondly, the decrease in the rotational speed is due to the frictional force between the protrusion and the disk described above, but the variation in the frictional force is large. Considering this, a certain threshold value is provided for the rotational speed to discriminate between normal and abnormal. You may not be able to
Thirdly, in the case of a device that also handles a disc containing a cartridge, such as a DVD-RAM drive, when the cartridge is used, the cartridge cannot be placed on the tray if the protrusion protrudes from the tray. By maintaining the protruding state from the tray by the urging force of the urging means such as, the cartridge is maintained at a predetermined position for holding the disk when the cartridge is not loaded, and the cartridge is loaded when the cartridge is loaded. In many cases, the spring is compressed by resisting the urging force of the urging means, and the protrusion is stored below the surface of the tray (that is, the protrusion is recessed from the tray). The biasing force must be small because it has to be compressed, while this small biasing force is required when placing the disc on it. Therefore, the frictional force generated between the depression and protrusion of the protrusion is reduced, and a threshold value is set to control the depression and protrusion. However, there is a problem that it is difficult to satisfy both requirements.

  An object of the present invention is to provide an information recording / reproducing apparatus capable of solving the conventional problems related to detection of an abnormality in the loading state of the disc.

The information recording / reproducing apparatus of the present invention overhangs a disk mounting portion on which a disk, which is a disk-shaped recording medium, and a part of the disk mounting portion, and in a vertically placed state, the disk is mounted on the disk mounting portion. And an information recording / reproducing apparatus for moving the tray between a position where the disk is attached and detached and a position where information is recorded or reproduced with respect to the disk.
Rotating means for rotating the disk;
A rotational speed measuring means for measuring the rotational speed of the rotating means;
Time measuring means for measuring the elapsed time from the start of the rotating means;
The abnormal mounting state in which the disk is mounted on the disk mounting portion via the holder, when the elapsed time measured by the time measuring means becomes a predetermined value, according to the rotational speed of the rotating means, Data storage means for storing a threshold for detection in advance;
When the predetermined time has elapsed from the start of the rotation means, an abnormality is detected when the rotation speed measured by the rotation speed measurement means is compared with the threshold value stored in advance in the data storage means and the rotation speed is small. And a comparison means for outputting a signal.

Another information recording / reproducing apparatus of the present invention overhangs a disk mounting portion on which a disk, which is a disk-shaped recording medium, and a part of the disk mounting portion, and in a vertically placed state, the disk is mounted on the disk. An information recording / reproducing apparatus having a tray provided with a holding tool for holding the mounting unit, and moving the tray between a mounting / demounting position of the disk and a position for recording or reproducing information with respect to the disk. And
Rotating means for rotating the disk;
Torque measuring means for measuring a load torque necessary for the rotating means to rotate the disk; and
Time measuring means for measuring the elapsed time from the start of the rotating means;
It is required for the rotating means when the elapsed time measured by the time measuring means reaches a predetermined value in the abnormal mounting state where the disk is placed on the disk placing portion via the holder. Data storage means for storing in advance a threshold value for detection by load torque;
An abnormality detection signal when the load torque is large by comparing the load torque measured by the torque measurement means with the threshold value stored in advance in the data storage means when the predetermined time has elapsed from the activation of the rotation means. And a comparison means for outputting.

  In the above configuration, the holder is urged by a spring in a direction perpendicular to the tray mounting surface, and the cartridge is pushed on the cartridge mounting surface by placing the cartridge on the tray mounting surface. The disk holder is retractable from the surface, and is provided with a rotation suppressing means for suppressing the rotation of the disk by the rotating means at a portion of the holder that comes into contact with the disk when the disk is abnormally mounted.

  The said structure WHEREIN: The said rotation suppression means is a material which has an adsorptivity with respect to the said disk at the time of contact with the said disk.

  In the above-described configuration, the abnormal mounting is detected from when the disk is mounted until the information is recorded or reproduced on the disk.

  In the above configuration, the torque measuring means further measures the generated torque generated by the rotating means, and the generated torque of the rotating means measured by the torque measuring means at the time of detecting the abnormal mounting is the information of the information on the disk. It is smaller than the torque generated by the rotating means when recording or reproducing.

  In the above configuration, the generated torque measured by the torque measuring means at the time of detecting the abnormal mounting is a torque that does not damage the disk when the disk is abnormally mounted.

  In the above configuration, the generated torque measured by the torque measuring means at the time of detecting the abnormal mounting is a value at which the disk cannot be rotated when the disk is abnormally mounted, and the disk is normally mounted. Is a value that can be rotated.

Another information recording / reproducing apparatus of the present invention overhangs a disk mounting portion on which a disk, which is a disk-shaped recording medium, and a part of the disk mounting portion, and in a vertically placed state, the disk is mounted on the disk. An information recording / reproducing apparatus having a tray provided with a holding tool for holding the mounting unit, and moving the tray between a mounting / demounting position of the disk and a position for recording or reproducing information with respect to the disk. And
Rotating means for rotating the disk;
A rotational speed measuring means for measuring the rotational speed of the rotating means;
Time measuring means for measuring the elapsed time from the start of the rotating means;
The abnormal mounting state in which the disc is placed on the disc placement portion via the holder is measured until the number of revolutions measured by the revolution number measurement means reaches a certain number of revolutions from the start of the rotation means. Data storage means for preliminarily storing a threshold for detection according to the elapsed time measured by the means;
The elapsed time measured by the time measuring means is compared with the threshold value stored in advance in the data storage means until the rotational speed measured by the rotational speed measuring means reaches a certain rotational speed from the start of the rotating means. Comparing means for outputting an abnormality detection signal when the elapsed time is long is provided.

Another information recording / reproducing apparatus of the present invention overhangs a disk mounting portion on which a disk, which is a disk-shaped recording medium, and a part of the disk mounting portion, and in a vertically placed state, the disk is mounted on the disk. An information recording / reproducing apparatus having a tray provided with a holding tool for holding the mounting unit, and moving the tray between a mounting / demounting position of the disk and a position for recording or reproducing information with respect to the disk. And
Rotating means for rotating the disk;
A rotational speed measuring means for measuring the rotational speed of the rotating means;
Drive current measuring means for measuring a drive current corresponding to the rotation speed of the rotating means;
When the rotational speed measured by the rotational speed measuring means reaches a predetermined rotational speed when the disk is mounted on the disk mounting portion via the holder, the drive current measuring means Data storage means for previously storing a threshold value for detection based on the measured drive current;
The drive current measured by the drive current measurement unit when the rotation number measured by the rotation number measurement unit reaches a predetermined rotation number is compared with the threshold value stored in advance in the data storage unit. And a comparison means for outputting an abnormality detection signal when the value is large.

  According to the information recording / reproducing apparatus of the present invention, the disc is not damaged even if the detection operation is performed in the abnormal mounting state of the disc. Further, since the rotation load is increased by the rotation suppressing means, the difference in the number of rotations is larger than that in the normal mounting, and abnormal mounting can be easily detected.

  Hereinafter, an information recording / reproducing apparatus according to an embodiment of the present invention will be described with reference to FIGS.

  The best embodiment of the information recording / reproducing apparatus of the present invention will be described below. The information recording / reproducing apparatus taken up in the following embodiment is a DVD-RAM drive, but the application of the present invention is not limited to this. Needless to say.

  1 (a) and 1 (b) are schematic configuration diagrams showing the main part of the loading mechanism according to the embodiment of the present invention. FIG. 1 (a) shows a state in which the tray is accommodated in the housing, FIG. b) schematically shows a state in which the disc is clamped by the spindle motor and the preparation for recording and reproduction is completed. 2 (a) and 2 (b) are configuration diagrams of the tray portion of the information recording / reproducing apparatus according to the embodiment of the present invention. FIG. 2 (a) is a plan view and FIG. 2 (b) is a perspective view. FIG. 3 is a partially enlarged perspective view thereof. This embodiment will be described below as a DVD-RAM drive. DVD-RAM drives are 8cm and 12cm CD-A, CD-ROM, CD-R / RW, DVD-ROM, DVD-R / RW, etc. -A RAM disk can also be mounted for recording and playback. Normally, the disk surface is installed horizontally, but it is installed so that the disk surface is vertical as required by the user. Can also be used.

  1 (a), 1 (b), 2 (a) and 2 (b), 1 is a housing, 2 is a main bar, 3 is a tray, 4 is a disk holder, 5 is rubber, 6 is a clamper, 7 is a turntable, 8 is a spindle motor, 9 is a disk, 10 is a rotation fulcrum, 11 is a disk mounting portion, for example, a disk positioning recess, 12 is a disk holder biasing spring, and 13 is Main bar bias spring.

  FIG. 4 is a control block diagram of the information recording / reproducing apparatus according to the present embodiment. In FIG. 4, 6 is a clamper, 7 is a turn table, 8 is a spindle motor, and 9 is a disk, which are the same as those given the same numbers in FIGS. Further, 14 is a comparison means, 15 is a control means, 16 is a drive means, 17 is a time measurement means, 18 is a rotation speed measurement means, and 19 is a data storage means.

  The tray 9 has a disk 9 placed thereon. The tray 3 is fed out from the housing 1 by a loading mechanism (not shown) as shown in FIG. 2 when the user wants to mount the disc 9 to be recorded / reproduced by the user on the information recording / reproducing apparatus. The disc 9 to be recorded / reproduced can be placed. When a user uses a bare disk that is not contained in a cartridge such as a CD-R, the user places the disk on the tray 3 in accordance with the disk positioning recess 11.

  As described above, this DVD-RAM drive can be installed and used so that the disk surface is vertical. When installed so that the disk surface is vertical, the disk 9 cannot be placed on the tray 3. For this reason, the disc holder 4 and the main bar 2 have an overhanging portion on the disc positioning recess 11 indicating the range on which the disc 9 is placed, and when the disc surface is set to be vertical, At this portion, the disk 9 is prevented from sliding off the tray 3, and the disk 9 is held approximately at the position of the disk positioning recess 11.

  Since the disc holder 4 and the main bar 2 have an overhanging portion on the disc positioning recess 11 indicating the range in which the disc 9 is placed, when the user places the disc 9 on the tray 3, It must be placed under the overhang.

  Further, when a disc contained in a cartridge such as a DVD-RAM disc is mounted, the disc holder 4 and the main bar 2 interfere with the cartridge as it is. Therefore, the disc holder 4 and the main bar 2 are urged by the disc holder urging spring 12 and the main bar urging spring 13, respectively, and are located at predetermined positions. When a disc containing a cartridge is mounted, the disc holder urging spring 12 is compressed by the weight of the cartridge or the like, and the disc holder 4 rotates about the rotation fulcrum 10 and retracts inward from the surface of the tray 3. Similarly, when the cartridge is mounted, the main bar 2 is pushed by the cartridge and placed on the tray 3 so that the main bar biasing spring 13 is compressed and the main bar 2 is retracted to the rear of the cartridge.

  Since the disc holder biasing spring 12 must be compressed by its own weight or the like, its biasing force is weak. Further, since the disc holder 4 has a portion that slides on the tray, the disc holder 4 is made of a material having good sliding properties. For this reason, the friction coefficient with the disk 9 is relatively small.

  A portion of the disc holder 4 that comes into contact when the disc 9 is abnormally mounted is provided with a rotation suppressing means for suppressing the rotation of the disc 9. In the present embodiment, rubber 5 is fitted into the disc holder 4 as an example of the rotation suppressing means. The rubber 5 does not damage the disk 9 even if it slides, and the friction coefficient with the disk 9 is very large as compared with the material of the disk holder 4.

  When the disk 9 in FIG. 1B is clamped to the spindle motor 8 by the clamper 6 and the preparation for recording / reproduction is completed, the tray 3 is placed inside the housing 1 with the disk 9 placed thereon by a loading device (not shown). , And the turntable 7 integrally attached to the rotating shaft of the spindle motor 8 rises from below, whereby the disk 9 is placed on the turntable 7 and separated from the tray 3. At the same time, the clamper 6 is lowered. A magnet is incorporated in the clamper 6, and this attracts an iron piece incorporated in the turntable 7, so that the disk 9 is pressure-bonded to the turntable 7 so that it can rotate integrally with the turntable 7.

  The spindle motor 8 is driven by driving means 16 (see FIG. 4). The driving means 16 can generate an arbitrary rotation speed or torque in the spindle motor 8 by controlling the driving current of the spindle motor 8. Further, the rotational speed is measured by the rotational speed measuring means 18 and input to the control means 15. As a result, during normal recording / reproduction, the control means 15 can control the spindle motor 8 to an arbitrary number of revolutions necessary for recording / reproduction. These configurations are generally provided in almost all types of optical disc apparatuses. The time measuring means 17 measures the time from the start of the spindle motor 8 and outputs the value to the comparing means 14.

  The data storage means 19 has the rotational speed data for determining whether or not the disk 9 is in a normal state, and the motor torque when determining whether or not the disk is in a normal state as the drive current value of the motor 8. It is stored as data. The rotation speed or torque data is output to the comparison means 14. Further, data of the motor drive current value is output to the control means 15. When the comparing means 14 recognizes from the output of the time measuring means 17 that a predetermined time has elapsed since the start of the spindle motor 8, the output of the rotational speed measuring means 18 at that time is stored in the data storage means 19 And the result is output to the control means 15.

  The operation of the information recording / reproducing apparatus configured as described above will be described. In the present embodiment, as described above, the disk 9 can be installed and used so that the surface of the disk 9 is vertical. Since the disc 9 is installed so that the surface of the disc 9 is vertical, the disc holder 4 and the main bar 2 have an overhanging portion on the disc positioning recess 11 indicating the range in which the disc 9 is placed. When the user places the disk 9 on the tray 3, the user must place the disk 9 under the disk holder 4 and the overhanging portion of the main bar 2.

  When the disc 9 is mounted on the tray 3, the outer periphery of the disc 9 is brought into contact with the main bar 2, the main bar biasing spring 13 is pressed, and the disc 9 is aligned with the disc positioning recess 11 of the tray 3. Is very rarely placed on the main bar 2. However, when the disc 9 is mounted on the tray 3, the disc 9 is mounted while being tilted with respect to the tray 3 from above the disc holder 4, so that the user must put the disc 9 under the overhang of the disc holder 4. The disc holder 4 is not necessarily placed but may be placed on the disc holder 4. Even in such a state, since the turntable 7 fixed to the spindle motor 8 has a slope, the disk 9 is sandwiched between the turntable 7 and the clamper 6 and the drive of the spindle motor 8 is started for normal recording and reproduction. . That is, as shown in FIG. 5, the spindle motor 8 may rotate with the disk 9 placed on the disk holder 4, and may rotate to the rotational speed at which recording or reproduction is performed. When the disk 9 rotates in this abnormal placement state, the information surface of the disk 9 is damaged by the contact between the disk holder 4 and the information surface for recording and reproducing the information signal of the disk 9.

  In order to avoid this damage, it is necessary for the control means 15 to perform an operation to determine whether the mounted state of the disk 9 is normal or abnormal before the operation for normal recording / reproduction is started when the disk 9 is mounted. There is. For this reason, first, the spindle motor 8 is driven by the driving means 16 based on the data on the rotational speed of the motor stored in the data storage means 19. When the driving of the spindle motor 8 is started, the time measuring means 17 starts measuring time, and when a predetermined time elapses, the rotational speed measuring means 18 that also serves as the torque measuring means measures the rotational speed of the spindle motor 8 at that time. The comparing means 14 compares this measured value with the data of the number of revolutions after a certain time which becomes the threshold value stored in the data storing means 19 and outputs the result to the control means 15. In the case of abnormal mounting, since there is something that contacts the outer periphery of the disk 9, the load torque increases and the rotational speed that reaches within a certain time decreases, so the disk mounting state is normal at the rotational speed after a certain time. It can be determined whether or not. When it is determined that the mounting is abnormal, the disc 9 is released from the clamp, and the tray 3 is discharged out of the housing 1.

  In the present embodiment, when the vehicle rides on the main bar 2, the load torque increases greatly, so that it is relatively easy to determine by such a method. However, in the case of the disc holder 4, since it is urged by the disc holder urging spring 12, even if the disc 9 is placed on the disc holder 4, the generated frictional force is small, so that the rotational speed is reduced. It is difficult to detect. Therefore, when the disk 9 is abnormally placed on the disk holder 4, rotation suppression means 5 that suppresses the rotation of the disk 9 is provided on the surface of the disk holder 4 that contacts the disk 9. As described above, in this embodiment, the comparison unit 14 compares the rotation number when the spindle motor 8 is rotated for a predetermined time with the rotation number data stored in advance in the data storage unit 19, thereby mounting the disk 9. It can be determined whether or not is normal or abnormal.

  Next, the operation of another embodiment of the information recording / reproducing apparatus of the present invention will be described. This embodiment is also a DVD-RAM drive, and can be installed and used so that the surface of the disk 9 is vertical as in the previous embodiment. Since the disk holder 4 and the main bar 2 are configured to be installed so that the surface of the disk 9 is vertical, there is an overhanging portion on the disk positioning recess 11 indicating the range in which the disk 9 is placed. When the user places the disk 9 on the tray 3, the user must place the disk 9 so as to be placed under the overhanging portion of the disk holder 4 and the main bar 2.

  When the disc 9 is mounted on the tray 3, the outer periphery of the disc 9 is brought into contact with the main bar 2, the main bar biasing spring 13 is pressed, and the disc 9 is aligned with the disc positioning recess 11 of the tray 3. Is not placed on the main bar 2. However, when the disk 9 is mounted on the tray 3, the disk 9 is mounted while being inclined with respect to the tray 3 from above the disk holder 4 as shown in FIG. The disc 9 is not necessarily placed under the overhang, but may be placed on the disc holder 4. Even in such a state, since the turntable 7 fixed to the spindle motor 8 has a slope, the disk 9 is sandwiched between the turntable 7 and the clamper 6 and the drive of the spindle motor 8 is started for normal recording and reproduction. . That is, as shown in FIG. 5B, the spindle motor 8 may rotate with the disk 9 placed on the disk holder 4, and may rotate to the rotational speed at which recording or reproduction is performed. When the disk 9 rotates in this abnormal placement state, the information surface of the disk 9 is damaged by the contact between the disk holder 4 and the information surface for recording and reproducing the information signal of the disk 9.

  In order to avoid this damage, it is necessary for the control means 15 to perform an operation to determine whether the mounted state of the disk 9 is normal or abnormal before the operation for normal recording / reproduction is started when the disk 9 is mounted. There is. Therefore, first, the spindle motor 8 is driven by the drive means 16 based on the motor torque data stored in the data storage means 19. When the driving of the spindle motor 8 is started, the time measuring means 17 starts measuring time, and when a predetermined time elapses, the rotational speed measuring means 18 is required for the rotational speed of the spindle motor 8 and the rotational speed at that time. The load torque is measured, and the comparison means 14 compares this measured value with the data stored in the data storage means 19 and outputs the result to the control means 15. In the case of abnormal mounting, since there is something that contacts the outer periphery of the disk 9, the load torque increases, and it can be determined whether or not the disk mounting state is normal based on the load torque after a certain time. When it is determined that the mounting is abnormal, the disc 9 is released from the clamp, and the tray 3 is discharged out of the housing 1.

  In the present embodiment, when the vehicle rides on the main bar 2, the load torque increases greatly, so that it is relatively easy to determine by such a method. However, in the case of the disc holder 4, since it is urged by the disc holder urging spring 12, even if the disc 9 is placed on the disc holder 4, the generated frictional force is small, so that the load torque increases. It is difficult to detect. Therefore, when the disk 9 is abnormally placed on the disk holder 4, rotation suppression means 5 that suppresses the rotation of the disk 9 is provided on the surface of the disk holder 4 that contacts the disk 9.

  Next, an example in which the rotation speed in the previous embodiment is taken up will be described, but the principle is the same even in the torque in the later embodiment. FIG. 6 is a graph showing the relationship between the drive current of the spindle motor and the rotational speed after 800 ms. In the graph of FIG. 6, when the disk holder 4 and the disk 9 are in direct contact with each other without the rubber 5 that is the rotation suppression means as a mounting abnormality when the disk holder 4 is normally mounted (black circle in FIG. 6). The painted triangle mark) and the case where the rubber 5 is present at the contact portion between the disk holder 4 and the disk 9 (black square mark in the figure) are shown. When mounted normally, the rotation speed after 800 ms increases almost linearly through the origin, and is about 300 r. p. m. On the other hand, if there is no rubber 5 at the contact portion between the disc holder 4 and the disc 9 even if it is abnormally mounted, 120 r. p. The rotational speed is about m. The threshold value is 200 r. p. It is possible to discriminate for a while if it is determined that m is normally attached above the threshold value, and it is determined that there is an abnormality at the rotation speed below the threshold value. With such a margin, it is impossible to make an accurate determination practically. On the other hand, in the case of the disc holder 4 provided with the rubber 5, since the friction between the rubber 5 and the disc 9 is increased, the rotational speed is 0 up to about 80 mA, and finally 80 r. p. m. Therefore, for example, as shown in the figure, the drive current is 30 mA and the rotation speed threshold is 60 r. p. m, in the normal case, this drive current is usually about 300 r. p. Therefore, the possibility that the normal case is erroneously determined as abnormal is very low. In the case of abnormal mounting, the driving current is less than half of the actual rotating driving current, so in most cases the motor does not rotate. p. Since m is a case where driving is performed with a current that is four times or more of 30 mA, the possibility of abnormal mounting being determined to be normal is very low. Also, since the number of rotations at that time is very low, the possibility of damaging the disk is very low.

  When the spindle motor 8 is normally started, a drive current of several hundred mA is normally applied. With such a large current, even in abnormal mounting, 1000 r. p. There is a possibility of damaging the disk due to the rotation speed exceeding m. However, by discriminating by driving with a small current in this way, the disk 9 can be prevented from being damaged. In addition, a small current is more advantageous from the viewpoint of tolerance for misclassification.

  As described above, in the present embodiment, when the disk 9 rides on the main bar 2, the load torque is greatly increased. Therefore, the determination can be made without using the rubber 5. However, depending on the device, even when the disk 9 is not spring-biased in this way, the difference between normal and abnormal is small, and it may be necessary to suppress rotation by a friction member such as rubber. There is no.

  The data storage means 19 has a drive current value of 30 mA as torque data and 60 r. p. m is stored, and when the time measuring means 17 has passed 800 ms from the start of the spindle motor 8, the rotational speed is 60r. p. It is determined whether or not the disk 9 has been normally mounted depending on whether or not m or more.

  As a result, in the present embodiment, the detection of the abnormality in the mounting of the disk is performed before starting the spindle motor 8 for the purpose of recording or reproducing information with respect to the disk 9 from the mounting operation of the disk 9 to detect the abnormality in the mounting. The torque generated by the spindle motor 8 at this time is a torque that does not damage the disk even in an abnormal state of the disk mounting. When the disk 9 is abnormally mounted, the information recording / reproducing device comes into contact with the disk 9 Since the rubber 5 which is a rotation suppression means that suppresses the rotation of the disk 9 is arranged with a large friction coefficient, the disk is not damaged even if the detection operation is performed in the disk mounting abnormality state. When the disk is abnormal, the frictional load of the disk rotation increases. It is possible to obtain reliable information recording and reproducing apparatus.

  In this embodiment, the disc holder is biased by a spring. However, in a device that does not use a cartridge, the disc holder may be fixed instead of the spring bias. Further, although the embodiment has been described in which rubber is fitted as the rotation suppressing means, a material having an adsorptivity with respect to the disk surface in contact with the rotation suppressing means, for example, silicone resin, urethane resin, soft vinyl chloride resin, etc. A material other than rubber can be applied, and a material having flexibility is more preferable than the material of the disc holder. Further, although the determination is made based on the number of rotations after a predetermined time, the determination may be made based on the time required to reach a certain number of rotations, or may be determined based on the drive current for obtaining the predetermined number of rotations. .

  In this embodiment, the comparison unit, the control unit, the time measuring unit, the rotation number measuring unit, and the data storage unit are separately provided. However, a part of software or hardware for controlling a general optical disc apparatus is used. You may provide as. Further, the rotational speed measuring means may share an FG (frequency generator) for rotational speed control that is generally provided in the spindle motor of the optical disk apparatus. In addition, the determination of the mounting abnormality is performed separately before the normal activation, but the spindle motor drive torque may be reduced at the beginning of the normal activation.

  In the information recording / reproducing apparatus according to the present invention, the detection of abnormality of the disk mounting is performed after the disk mounting operation and before starting the disk motor for the purpose of recording or reproducing information on the disk, and also the abnormality of mounting. The generated torque of the disk motor at the time of detection is a torque smaller than the generated torque of the rotating means at the time of recording or reproducing the information of the disk, which does not damage the disk even in the abnormal state of the disk mounting, By arranging a friction member that increases the coefficient of friction with the disk at the part where the information recording / reproducing device contacts the disk when the disk is abnormally mounted, a DVD recorder, DVD-RAM, DVD-R / RW drive, etc. It can also be applied to devices where damage must be avoided reliably.

(A) is a schematic sectional drawing which shows the structure before the disc mounting of one Embodiment in the information recording / reproducing apparatus of this invention, (b) is a schematic sectional drawing which shows the structure after the disc mounting. (A) is a top view of the tray part by the embodiment, (b) is a perspective view of the tray part. FIG. 3 is a partially enlarged perspective view of the disk holder of FIG. It is a control block diagram of the embodiment. (A) is a schematic sectional drawing which shows the structure of the state just before abnormal mounting of the disk of the embodiment, (b) is a schematic sectional view showing the structure of the abnormal mounting state of the disk. It is a correlation diagram which shows the relationship between the drive current of a spindle motor, and rotation speed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Case 2 Main bar 3 Tray 4 Disc holder 5 Rubber 6 Clamper 7 Turn table 8 Spindle motor 9 Disc 10 Rotating fulcrum 11 Bare disc positioning recess 12 Disc holder biasing spring 13 Main bar biasing spring 14 Comparison means DESCRIPTION OF SYMBOLS 15 Control means 16 Drive means 17 Time measuring means 18 Rotational speed measuring means 19 Data storage means

Claims (10)

There is provided a disk mounting portion for mounting a disk, which is a disk-shaped recording medium, and a holder for overhanging a part of the disk mounting portion and holding the disk on the disk mounting portion in a vertically placed state. An information recording / reproducing apparatus that includes a tray and moves the tray between a position where the disk is attached and detached and a position where information is recorded or reproduced on the disk;
Rotating means for rotating the disk;
A rotational speed measuring means for measuring the rotational speed of the rotating means;
Time measuring means for measuring the elapsed time from the start of the rotating means;
The abnormal mounting state in which the disk is mounted on the disk mounting portion via the holder, when the elapsed time measured by the time measuring means becomes a predetermined value, according to the rotational speed of the rotating means, Data storage means for storing a threshold for detection in advance;
When the predetermined time has elapsed from the start of the rotation means, an abnormality is detected when the rotation speed measured by the rotation speed measurement means is compared with the threshold value stored in advance in the data storage means and the rotation speed is small. An information recording / reproducing apparatus comprising comparison means for outputting a signal. There is provided a disk mounting portion for mounting a disk, which is a disk-shaped recording medium, and a holder for overhanging a part of the disk mounting portion and holding the disk on the disk mounting portion in a vertically placed state. An information recording / reproducing apparatus that includes a tray and moves the tray between a position where the disk is attached and detached and a position where information is recorded or reproduced on the disk;
Rotating means for rotating the disk;
Torque measuring means for measuring a load torque necessary for the rotating means to rotate the disk; and
Time measuring means for measuring the elapsed time from the start of the rotating means;
It is required for the rotating means when the elapsed time measured by the time measuring means reaches a predetermined value in the abnormal mounting state where the disk is placed on the disk placing portion via the holder. Data storage means for storing in advance a threshold value for detection by load torque;
An abnormality detection signal when the load torque is large by comparing the load torque measured by the torque measurement means with the threshold value stored in advance in the data storage means when the predetermined time has elapsed from the activation of the rotation means. The information recording / reproducing apparatus provided with the comparison means which outputs.   The holder is urged by a spring in a direction perpendicular to the tray mounting surface, and the cartridge is pushed on the cartridge mounting surface to be retracted from the tray mounting surface. 3. The disk holder according to claim 1, further comprising: a rotation suppressing means for suppressing rotation of the disk by the rotating means at a portion of the holder that comes into contact with the disk when the disk is abnormally mounted. Information recording / reproducing apparatus.   4. The information recording / reproducing apparatus according to claim 3, wherein the rotation suppressing means is made of a material having an adsorptivity to the disk when contacting the disk.   5. The information recording / reproducing apparatus according to claim 3, wherein the abnormal mounting is detected during a period from when the disk is mounted to when the information is recorded or reproduced on the disk.   The torque measuring means further measures the generated torque generated by the rotating means, and the generated torque of the rotating means measured by the torque measuring means at the time of detecting the abnormal mounting records or reproduces the information on the disk. 3. The information recording / reproducing apparatus according to claim 2, wherein the torque is smaller than the torque generated by the rotating means.   7. The information recording / reproducing apparatus according to claim 6, wherein the generated torque measured by the torque measuring means at the time of detecting the abnormal mounting is a torque that does not damage the disk when the disk is abnormally mounted.   The generated torque measured by the torque measuring means at the time of detecting the abnormal mounting is a value at which the disk cannot be rotated when the disk is abnormally mounted, and is rotated when the disk is normally mounted. The information recording / reproducing apparatus according to claim 7, wherein the information recording / reproducing apparatus is a value that can There is provided a disk mounting portion for mounting a disk, which is a disk-shaped recording medium, and a holder for overhanging a part of the disk mounting portion and holding the disk on the disk mounting portion in a vertically placed state. An information recording / reproducing apparatus that includes a tray and moves the tray between a position where the disk is attached and detached and a position where information is recorded or reproduced on the disk;
Rotating means for rotating the disk;
A rotational speed measuring means for measuring the rotational speed of the rotating means;
Time measuring means for measuring the elapsed time from the start of the rotating means;
The abnormal mounting state in which the disc is placed on the disc placement portion via the holder is measured until the number of revolutions measured by the revolution number measurement means reaches a certain number of revolutions from the start of the rotation means. Data storage means for preliminarily storing a threshold for detection according to the elapsed time measured by the means;
The elapsed time measured by the time measuring means is compared with the threshold value stored in advance in the data storage means until the rotational speed measured by the rotational speed measuring means reaches a certain rotational speed from the start of the rotating means. An information recording / reproducing apparatus comprising: a comparison unit that outputs an abnormality detection signal when the elapsed time is long. There is provided a disk mounting portion for mounting a disk, which is a disk-shaped recording medium, and a holder for overhanging a part of the disk mounting portion and holding the disk on the disk mounting portion in a vertically placed state. An information recording / reproducing apparatus that includes a tray and moves the tray between a position where the disk is attached and detached and a position where information is recorded or reproduced on the disk;
Rotating means for rotating the disk;
A rotational speed measuring means for measuring the rotational speed of the rotating means;
Drive current measuring means for measuring a drive current corresponding to the rotation speed of the rotating means;
When the rotational speed measured by the rotational speed measuring means reaches a predetermined rotational speed when the disk is mounted on the disk mounting portion via the holder, the drive current measuring means Data storage means for previously storing a threshold value for detection based on the measured drive current;
The drive current measured by the drive current measurement unit when the rotation number measured by the rotation number measurement unit reaches a predetermined rotation number is compared with the threshold value stored in advance in the data storage unit. An information recording / reproducing apparatus comprising comparison means for outputting an abnormality detection signal when the signal is large.

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