JPH1125580A - Disk unit - Google Patents

Abstract

An object of the present invention is to detect whether a small-diameter disk or a normal disk to which an adapter is fitted is mounted. A disk detection coil (20) is provided above a disk mounting position. When the disk 11 having a diameter of 12 cm is mounted, a high-frequency current is supplied to the disk detection coil 20 and a magnetic field is formed around the disk detection coil 20. The high frequency of the detection coil 20 decreases. Then, when the detection circuit 22 detects a voltage change generated in the disk detection coil 20, the determination circuit 23 determines the presence or absence of the disk 11 having a diameter of 12 cm. The microcomputer 19 executes disk rotation control according to the disk size determined by the determination circuit 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive, and more particularly, to a disk drive configured to fit an annularly formed adapter around an outer periphery of a disk-shaped recording medium having a smaller diameter than a normal disk. About.

[0002]

2. Description of the Related Art For example, in a disk drive on which a disk-shaped recording medium such as a CD-ROM is mounted, the disk-shaped recording medium is inserted into a disk insertion slot without being placed on a tray or housed in a cartridge. Some have a direct slot-in mechanism. In this type of disk device, a disk mounting mechanism is provided which, when the disk-shaped recording medium is inserted into the disk insertion slot, grips the outer periphery of the disk-shaped recording medium and automatically draws the disk-shaped recording medium to a predetermined mounting position. ing.

When the recording medium is a CD-ROM, there are a small-diameter disk having a diameter of 8 cm and a disk having a diameter of 12 cm. Usually, a CD-ROM having a diameter of 12 cm is often used.
There is also ROM. For this reason, there is a disk device having a disk mounting mechanism for detecting a CD-ROM having a diameter of 8 cm or a CD-ROM having a diameter of 12 cm and individually guiding and mounting disks having different sizes. In this case, a sensor for detecting each size, a disk guide according to the diameter of the disk, and a gripping mechanism corresponding to the outer diameter of each disk are required.

[0004] Therefore, the diameter is 8 cm without using an adapter.
In a disk drive configured to directly mount a CD-ROM and a CD-ROM having a diameter of 12 cm, there is a high possibility that the mounting mechanism is complicated and the manufacturing cost is high. Also, in the case of a CD-ROM, since a disk having a diameter of 12 cm is usually mounted, the size and mounting position of the gripping member of the disk mounting mechanism are determined so as to grip the outer periphery having a diameter of 12 cm. Therefore, the diameter 8
When a CD-ROM of cm is mounted, an annular adapter having an inner diameter of 8 cm and an outer diameter of 12 cm is fitted to the outer periphery. Thereby, the outer diameter of the CD-ROM having a diameter of 8 cm is apparently 12 cm in diameter, and can correspond to the gripping member of the disk mounting mechanism. The adapter is formed as a thin donut made of synthetic resin, and has an inner diameter of 8 cmC.
A claw portion to be engaged with the outer periphery of the D-ROM is provided every 120 degrees.

[0005] In the case of a CD-ROM having a diameter of 8 cm as described above, an annular adapter is fitted around the outer periphery of the CD-ROM.
It can be mounted on a disk device having a direct slot-in mechanism.

[0006]

Conventionally, as described above, by fitting an adapter to the outer periphery of a CD-ROM having a diameter of 8 cm, it is possible to mount a CD-ROM having a diameter of 8 cm and a mounting mechanism having a size of 12 cm. Since the configuration corresponds to only the CD-ROM, the configuration is simplified. However, recently developed CD-ROM devices have been increased to 16 to 20 times the standard speed.

Conventionally, a switch or the like for detecting that a disk has been mounted has been provided. When the switch is turned on, the operation of pulling the disk into the device starts. However, in the conventional disk drive,
The presence or absence of the adapter could not be identified, and the disk size could not be identified. For this reason, even when a CD-ROM with a diameter of 8 cm fitted with an adapter is mounted, it is rotated at a high speed of 16 to 20 times the standard speed as in the case with a CD-ROM with a diameter of 12 cm mounted.

When the disk is rotated at a high speed in a state where the adapter is fitted as in the case of a CD-ROM having a diameter of 8 cm, the claw portion of the adapter cannot withstand the high-speed rotation and the outer periphery of the CD-ROM having a diameter of 8 cm. It may come off from. In such a case, the adapter detached from the disk may be caught inside the apparatus, making the ejection operation difficult.

Therefore, an object of the present invention is to provide a disk device which solves the above problems.

[0010]

The present invention has the following features to solve the above-mentioned problems. Claim 1
According to the described invention, a first disk-shaped recording medium on which information is recorded or a second disk-shaped recording medium having a diameter smaller than that of the first disk-shaped recording medium and having an outer periphery fitted with an annular adapter is inserted. A disk insertion detecting means for detecting that the disk insertion is detected by the disk insertion detecting means, a disk mounting portion that grips the outer periphery of the first disk-shaped recording medium or the adapter and pulls into the apparatus, A turntable for rotating the disk-shaped recording medium mounted on the disk mounting portion at a speed higher than a standard speed, wherein the disk-shaped recording medium mounted on the disk mounting portion has a predetermined size. Disk size detection means for detecting the disk-shaped recording medium is detected by the disk insertion detection means, When the disk size detecting means is on, it is determined that the first disk-shaped recording medium is mounted, and when the disk size detecting means is off, it is determined that the second disk-shaped recording medium is mounted. Discriminating means for discriminating.

Therefore, according to the first aspect of the present invention, the insertion of the disk-shaped recording medium is detected by the disk insertion detecting means, and the first disk-shaped recording medium is turned on when the disk size detecting means is turned on. When the disc size detecting means is off, it is determined that the second disc-shaped recording medium has been mounted. Therefore, the second disc-shaped recording medium fitted with the adapter is inserted. Even in this case, it is possible to make a determination based on the outputs from the disk insertion detecting means and the disk size detecting means. Therefore, the size of each disk-shaped recording medium and the presence or absence of an adapter can be identified, and information can be read at a speed corresponding to the size of each disk-shaped recording medium.

According to a second aspect of the present invention, in the disk device according to the first aspect, when the discriminating means determines that the second disk-shaped recording medium is mounted, the turntable is turned off. It is characterized by comprising a rotation control means for prohibiting high-speed rotation. Therefore, according to the second aspect of the present invention, when the determination means determines that the second disk-shaped recording medium is mounted, the adapter is fitted to prevent the turntable from rotating at a high speed. When the second disk-shaped recording medium is mounted, the rotation speed of the turntable can be suppressed to prevent the adapter from coming off the second disk-shaped recording medium.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing a configuration of an embodiment of a disk drive according to the present invention. As shown in FIG. 1, the disk device 10 is a CD-RO having a diameter of 8 cm.
M-CD with CD-ROM of 12cm in diameter
It is a ROM playback device. Further, the disk device 10 is configured to read information at a high rotational speed of 16 to 20 times the standard rotational speed of the disk.

A disk-shaped recording medium (hereinafter, referred to as a “disk”) 11 mounted on a disk device 10 is clamped on a turntable 12. The turntable 12 is driven to rotate by a disk motor 13. When the disk 11 is inserted, the disk insertion sensor (disk insertion detecting means) 14 outputs a detection signal in association with the disk insertion operation. Note that the disk insertion sensor 14 may directly detect the disk 11 itself, or may detect an operating position of a lever or the like that operates by inserting the disk 11. The disc insertion sensor 14 may be a non-contact type sensor such as an optical sensor or a contact type sensor such as a micro switch.

The number of revolutions of the disk motor 13 is controlled by the current output from the disk motor circuit 15. The disk 11 clamped on the turntable 12 is driven to rotate, and the pickup 16 irradiates a laser beam onto the aluminum-deposited recording surface of the disk 11 to read information recorded on the disk 11. The read signal output from the pickup 16 is supplied to a signal processing unit 17. The read signal output from the pickup 16 is also fed back to the pickup servo circuit 18. The pickup servo circuit 18 moves the pickup 16 in the tracking direction based on the read signal. The microcomputer 19 is supplied with signals from the disk insertion sensor 14 and each circuit, and executes a pre-programmed control process.

A disk detecting coil (disk size detecting means) 20 for detecting that the disk 11 having a diameter of 12 cm is mounted on the turntable 12 is provided above the disk mounting position. Disk detection coil 20
When the small-diameter disk 11 ′ having a diameter of 8 cm is clamped on the turntable 12, the small-diameter disk 11 ′ is located outside the small-diameter disk 11 ′ and may be close to the upper and lower surfaces of the adapter 31 fitted to the outer periphery of the small-diameter disk 11 ′. Position. The disk detection coil 20 includes an oscillation circuit 21.
The high-frequency current output from is supplied.

When a disk 11 composed of a CD-ROM having a diameter of 12 cm is mounted, an aluminum thin film is deposited on the recording surface of the disk 11 facing the disk detection coil 20. Therefore, when a high-frequency current is supplied to the disk detection coil 20 and a magnetic field is formed around the disk detection coil 20, an eddy current is generated on the aluminum deposition surface, and the high frequency of the disk detection coil 20 decreases.

One end of the disk detection coil 20 is connected to a detection circuit 22 via a resistor R. The detection circuit 22 detects a voltage change generated in the disk detection coil 20. When the detection circuit 22 detects a voltage change, the determination circuit 23 determines the presence or absence of the disk 11 having a diameter of 12 cm based on the output level from the detection circuit 22. The determination result of the determination circuit 23 is input to the microcomputer 19. Then, the microcomputer 19 executes disk rotation control according to the disk size determined by the determination circuit 23 as described later.

Since the disk detecting coil 20 can detect the presence or absence of the disk 11 without being affected by reflected light from the chassis or the like as compared with an optical sensor or the like, it is less affected by disturbance than other sensors. The presence or absence of the disk 11 can be accurately detected. FIG. 2 is a plan view showing a state where the disk 11 having a diameter of 12 cm is inserted into the disk device 10.

The disk 11 inserted into the disk insertion slot 25a provided in the front bezel 25
Move along the line 6 into the device. When the outer periphery of the disk 11 is inserted to a predetermined insertion position by the operation of inserting the disk 11, the disk insertion sensor 14 shown in FIG. 1 is turned on. The disk 1 is detected by the disk insertion sensor 14.
When it is detected that 1 has been inserted to the predetermined insertion position,
The disk arms 27 and 28 are driven by a mounting motor (not shown) based on this detection signal. Therefore, the rollers 27a and 28a provided at both ends of the disk arms 27 and 28 are rotated in a counterclockwise direction, so that the rollers 27a and 28a contact the outer periphery of the disk 11. Thereby, the disk 1
1 is held by the disk arms 27 and 28.

Further, the disk arms 27 and 28 rotate counterclockwise, and the disk 11 is stored in a predetermined storage position of the disk storage unit 29. The disk 11 is held by a stock arm 30 provided in the disk storage unit 29. When reproducing the disk 11 stored in the disk storage unit 29, the stock arm 30 and the disk arms 27 and 28 are driven by a motor (not shown) and rotated by a command designating a desired disk. As a result, the disk 11 moves from the disk storage unit 29 to the turntable 12 side.

The disc 11 inserted from the disc insertion slot 25a can be directly clamped to the turntable 12 for reproduction. In this case, disk 1
1 is stopped at the clamp position without being stored in the disk storage unit 29. FIG. 3 is a plan view showing an operation state in which the disk 11 has moved to the clamp position. As shown in FIG. 3, the stock arm 30 and the disc arm 2
The disk 11 pulled out of the disk storage unit 29 by the rotation of the disks 7 and 28 reaches a clamp position where the disk 11 is clamped by the turntable 12. Disc arm 2
The motor for driving the motors 7 and 28 has a rotation position of a loading arm (not shown) which is a photo interrupter (not shown).
Is stopped when it is detected that the clamp position has been reached. Subsequently, the turntable 12 rises and clamps the disk 11. Then, the disk 11 is rotated at a quadruple speed by the disk motor 13. The pickup 16 reads the TOC information recorded on the disk 11.

Here, detection of a disk when a CD-ROM having a diameter of 12 cm is mounted will be described. Diameter 1
When the 2 cm disk 11 is inserted into the disk insertion slot 25 a of the front bezel 25, the aluminum deposition surface is located below the disk detection coil 20. The disk detection coil 20 generates a high-frequency magnetic field by the high frequency from the oscillation circuit 21. When the disk 11 clamped to the turntable 12 is a CD-ROM having a diameter of 12 cm, a reflective surface formed by aluminum deposition in the magnetic field direction of the disk detection coil 20 is formed. An eddy current is generated by electromagnetic induction.

The high frequency magnetic field is reduced by the eddy current. As a result, the detection circuit 22 detects a voltage change generated at both ends of the resistor R. The determination circuit 23 compares the voltage change detected by the detection circuit 22 with the reference value, and as a result, determines that the disk 11 is a disk 11 having a diameter of 12 cm. Next, detection of a disk in which an adapter is fitted around the outer periphery of a CD-ROM having a diameter of 8 cm will be described.

FIG. 4 is a block diagram showing a state in which the small-diameter disk 11 'fitted with the adapter 31 is mounted.
As shown in FIG. 4, when a small-diameter disc 11 ′ having a diameter of 8 cm is inserted into the disc insertion slot 25 a of the front bezel 25, the adapter 31 is placed below the disc detection coil 20.
Is located. This adapter 31 is made of synthetic resin,
On the inner periphery, a claw 31a engaging with the outer periphery of the small-diameter disk 11 '
Are provided at predetermined intervals. Since the claw 31a has relatively low strength, when the small-diameter disk 11 'rotates at high speed, it may come off from the small-diameter disk 11'.

When the small-diameter disc 11 'having a diameter of 8 cm, to which the adapter 31 is fitted, is clamped by the turntable 12, the adapter 31 made of synthetic resin is located below the disc detection coil 20. Does not change. For this reason, the determination circuit 23 determines that the small-diameter disk 11 ′ having a diameter of 8 cm to which the adapter 31 is fitted is mounted because the detection circuit 22 does not detect a voltage change.

Next, the motor control processing executed by the microcomputer 19 in the disk device 10 having the above configuration will be described. FIG. 5 shows the microcomputer 1
9 is a flowchart for explaining a process executed by the control unit 9; The microcomputer 19 performs the processing in step S1 of FIG.
In step (hereinafter "step" is omitted), it is checked whether the disk insertion sensor 14 is on. And
When the disk 11 is inserted from the disk insertion slot 25a and the disk insertion sensor 14 is turned on, the process proceeds to S2, and an oscillation on signal is output to the oscillation circuit 21.

The oscillation circuit 21 supplies a high-frequency current to the disk detection coil 20 in response to the arrival of the oscillation ON signal as described above. When the disk 11 is a CD-ROM having a diameter of 12 cm, an eddy current is generated on the aluminum-deposited surface by electromagnetic induction due to generation of a high-frequency magnetic field. Since the high-frequency magnetic field is reduced by the eddy current, the detection circuit 2
2 detects a voltage change generated at both ends of the resistor R. In this case, the determination circuit 23 determines that the disk 11 having a diameter of 12 cm is mounted.

When the small-diameter disc 11 'having a diameter of 8 cm is clamped by the turntable 12, the voltage at both ends of the resistor R does not change because the synthetic resin adapter 31 is located below the disc detection coil 20. for that reason,
The detection circuit 22 cannot detect a voltage change. In this case, the determination circuit 23 determines that the small-diameter disk 11 'having a diameter of 8 cm is mounted.

In the next step S3, the discrimination result of the disc size is read from the discrimination circuit 23. Then, in S4, an oscillation off signal is output to the oscillation circuit 21. In S5, the diameter 1
It is checked whether or not the 2 cm disc 11 is mounted. In S5, when the disc is not detected by the judgment circuit 23, the process proceeds to S6, and it is judged that the small-diameter disc 11 'having a diameter of 8 cm to which the adapter 31 is fitted is mounted. Then, high-speed rotation of the disk is prohibited in S7. Therefore, the disk motor 13 that rotationally drives the turntable 12 rotationally drives the small-diameter disk 11 ′ at a standard 1 × speed.

In S5, when the disc is detected by the judgment circuit 23, the flow shifts to S8, where the diameter 12
cm disc 11 is determined to be mounted. Then, in S9, high-speed rotation of the disk is permitted. for that reason,
Disk motor 13 for rotationally driving turntable 12
Drives the disk 11 at a standard 16 to 20 times speed.

Thus, the disk 11 having a diameter of 12 cm
When the disk 11 is mounted, the disk 11 is
Rotate at double speed for fast playback. Also, the adapter 31
When the small-diameter disk 11 'having a diameter of 8 cm fitted with is fitted, the small-diameter disk 11' is rotated at a standard 1x speed to perform reproduction. Therefore, the adapter 31 can be prevented from coming off the small-diameter disk 11 ′, and the small-diameter disk 1
1 'is enabled.

FIG. 6 is a block diagram showing a configuration of a modification of the present invention. In FIG. 6, the same parts as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted. In the disk device 40, a first disk detection coil 41 is disposed below the disk 11 clamped to the turntable 12, and a second disk detection coil 42 is disposed above the disk 11. First disk detection coil 4
The first and second disk detection coils 42 are
And the detection circuit 22 are connected in series. Also,
The first disk detection coil 41 and the second disk detection coil 42 are located outside the small-diameter disk 11 ′ having a diameter of 8 cm, and are provided at positions that can approach the upper and lower surfaces of the adapter 31.

Two disc detection coils are used, compared to one.
When the disk detection coils 41 and 42 are arranged, the difference between when a disk having a diameter of 12 cm is detected and when the disk cannot be detected by the adapter 31 is larger. Therefore, the voltage change detected by the detection circuit 22 is larger when the two disk detection coils 41 and 42 are provided.
As a result, the detection sensitivity of the disk detection coils 41 and 42 is improved, so that the disk detection coils 41 and 42 are less susceptible to disturbance and the size of the disk clamped to the turntable 12 can be detected more accurately.

The voltage change detection signal output from the detection circuit 22 is input to the A / D port of the CPU 43. Then, the CPU 43 performs a calculation based on the detection signal from the detection circuit 22 and compares the A / D converted detection signal with a preset reference value when there is no disc. As a result, the CPU 43 determines whether the disk 11 having a diameter of 12 cm is mounted or the small disk 11 ′ having a diameter of 8 cm to which the adapter 31 is fitted is mounted.

The level of the detection signal from the detection circuit 22 is
It is not uniform due to variations in the characteristics of the disk detection coils 41 and 42 and variations in the frequency of the oscillation circuit 21.
In order to correct this, detection is performed before and after the disk 11 reaches the clamp position. Then, the presence or absence of the disk 11 is detected by calculating the difference between the two detection signals.

The disk device 40 detects the adapter 31 in response to a disk playback command. The detection result is stored. Then, when it is detected that the disk 11 has been mounted at the clamp position, the detection of the adapter 31 is performed again. The CPU 43 determines the presence or absence of the disk 11 based on these adapter detection results. The reference value for determining the presence or absence of a disc having a diameter of 12 cm is
This is the level of the detection signal output from the detection circuit 22 when a high-frequency current is supplied to the disk detection coils 41, 42 in a state where the disks 11, 11 'are not mounted.
That is, the reference value is at the same level as when the adapter 31 was detected. Since this reference value changes over time,
Need to be updated regularly. Therefore, the reference value may be updated, for example, when a power switch (not shown) is turned on or when a disc is inserted.

The rotation control of the disk motor 13 executed by the microcomputer 19 is the same as that described with reference to the flowchart of FIG. 5, and a description thereof will be omitted. Further, an optical sensor or the like may be used instead of the disk detection coil. In this case, the detection light is reflected on the aluminum deposition surface of the disk to detect the presence or absence of the disk. If there is reflected light from the adapter,
It is also possible to store the light intensity reflected on the aluminum vapor-deposited surface of the disk and determine whether the disk or the adapter based on the light intensity of the reflected light.

Further, in the disk device 10 of FIG. 1, a CPU 43 can be used instead of the determination circuit 23, or in the disk device 40 of FIG.
The determination circuit 23 can be used instead of the CPU 43. In the above description, a disk device using a CD-ROM as a disk-shaped recording medium has been described. However, the present invention is not limited to this, and can be applied to a device in which a disk of another type is mounted. .

[0040]

As described above, according to the first aspect of the present invention, the insertion of the disk-shaped recording medium is detected by the disk insertion detecting means, and the first disk is detected when the disk size detecting means is on. The disk-shaped recording medium is mounted, and when the disk size detecting means is off, it is determined that the second disk-shaped recording medium is mounted. Can be determined on the basis of the output from the disc insertion detecting means and the disc size detecting means even when the disc is inserted. Therefore, the size of each disk-shaped recording medium and the presence or absence of an adapter can be identified, and information can be read at a speed corresponding to the size of each disk-shaped recording medium.

According to the second aspect of the present invention, when the discriminating means determines that the second disk-shaped recording medium is mounted, the turntable is prohibited from rotating at a high speed. When the fitted second disk-shaped recording medium is mounted, the rotation speed of the turntable can be suppressed to prevent the adapter from coming off the second disk-shaped recording medium. Therefore, even a disk having a small outer diameter can be mounted using an adapter, so that it is not necessary to provide a mounting mechanism for each size, and the configuration can be simplified and the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of a disk drive according to the present invention.

FIG. 2 is a plan view showing a state in which a disk having a diameter of 12 cm is inserted into a disk device.

FIG. 3 is a plan view showing an operation state in which a disk has moved to a clamp position.

FIG. 4 is a block diagram showing a state in which a small-diameter disk fitted with an adapter is mounted.

FIG. 5 is a flowchart illustrating a process executed by a microcomputer.

FIG. 6 is a block diagram showing a configuration of a modified example of the present invention.

[Explanation of symbols]

 10, 40 disk device 11 disk 11 'small-diameter disk 12 turntable 13 disk motor 14 disk insertion sensor 16 pickup 19 microcomputer 20 disk detection coil 21 oscillation circuit 22 detection circuit 23 determination circuit 27, 28 disk arm 31 adapter 41 first Disk detection coil 42 Second disk detection coil 43 CPU

Claims (2)

[Claims] 1. A first disk-shaped recording medium on which information is recorded or a second disk-shaped recording medium having a diameter smaller than that of the first disk-shaped recording medium and having an outer periphery fitted with an annular adapter is inserted. A disk insertion detecting means for detecting that the disk insertion is detected by the disk insertion detecting means, a disk mounting portion that grips the outer periphery of the first disk-shaped recording medium or the adapter and pulls into the apparatus, A turntable for rotating a disk-shaped recording medium mounted on the disk mounting portion at a speed higher than a standard speed, wherein the disk-shaped recording medium mounted on the disk mounting portion has a predetermined size. A disk size detecting means for detecting the insertion of the disk-shaped recording medium is detected by the disk insertion detecting means, When the disk size detecting means is on, it is determined that the first disk-shaped recording medium is mounted, and when the disk size detecting means is off, it is determined that the second disk-shaped recording medium is mounted. A disc device, comprising: discriminating means for discriminating. 2. The disk device according to claim 1, wherein when the determination unit determines that the second disk-shaped recording medium is mounted, the rotation prohibits the turntable from rotating at a high speed. A disk device comprising control means.