JPH08124283A - Disk equipment - Google Patents

Abstract

PURPOSE: To discriminate a disk accurately and quickly without increasing the number of components, in a disk equipment. CONSTITUTION: An intermediate time between a time required for the case when a turntable 2 whereon an 8-cm disk is mounted is driven to rotate and a time required for the case when the turntable 2 whereon a 12-cm disk is mounted is driven to rotate is set beforehand as a prescribed time required for switchover from a state of a spindle servo being locked in an ordinary mode to a high-speed mode and till the spindle servo is locked in the high-speed mode. This set time is compared with the time required for the spindle servo to be locked when the speed of reproduction is switched actually from the ordinary speed mode over to the high-speed mode, and thereby discrimination of the size of the diameter of a disk 1 is conducted. By this method, the kind of the disk 1 mounted on the turntable 2 can be discriminated by an initializing operation and the characteristics of a servo control of a spindle motor 3 can be set in an optimum manner in accordance with the discrimination.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk device capable of driving a plurality of kinds of disks with a single turntable.

[0002]

2. Description of the Related Art Usually, there is a compact disc (8 cm, 12 cm) as a disc on which reproduction data and the like are recorded. As this compact disc as well, data as an audio disc for recording music information or data as a recording medium for a computer is used. There are multiple types of discs, and the load on the spindle motor differs due to the difference in size, mass, data recording state, etc. for each disc, and the playback speed must be switched. In a disc device that can be driven by a single turntable, it is necessary to identify the disc mounted on the turntable.

Conventionally, as a method for discriminating such a disk, the characteristic of the servo control of the spindle motor is 8c.
8c can be set by optimizing the setting with m discs or by setting it between the 8cm disc and the 12cm disc.
A method and a disk sensor circuit are provided to make it compatible with both m and 12 cm disks, and it is determined whether the disk is an 8 cm disk or a 12 cm disk. How to switch to disk, and measure the time until the initial work is started from the stationary state of the disk until the servo of the spindle motor locks, and based on the measurement result, 8 cm disk or 12 cm
There is a method of discriminating whether the disc is a disc and switching the servo control characteristic of the spindle motor to that for the 8 cm disc and that for the 12 cm disc based on the discrimination result. .

[0004]

However, as in the above-mentioned conventional method, the servo characteristic of the spindle motor is set to 8c in advance.
If the disc is set between m disc or 8 cm disc and 12 cm disc, there is no problem in reproducing 8 cm disc, but when reproducing 12 cm disc, it takes time to rise and fall of disc rotation, and search access time There was a problem that was slow.

Further, the disc sensor circuit discriminates the disc to determine the characteristics of the servo control of the spindle motor.
By switching between the cm disc and the 12 cm disc, it takes no time to rise and fall the disc rotation for both the 8 cm disc and the 12 cm disc, and the search time is not delayed.
There is a problem in that a disk sensor circuit composed of a photo interrupter or the like has to be separately provided, which causes an increase in cost and a circuit scale due to an increase in the number of parts.

Further, the disc is discriminated by the time from the initialization of the disc in a stationary state until the servo of the spindle motor is locked, and the characteristic of the servo control of the spindle motor is switched between 8 cm disc and 12 cm disc. If it is set to 8 cm disc or 12 cm disc, it does not take time to rise and fall of the disc rotation, so the search time is not delayed, and a simple configuration is not required for disc discrimination. Although it can be performed by software processing, the measurement time will vary if the disc is not in a stationary state when discriminating the disc.Therefore, disc discrimination can be performed accurately when the initialization is retried or the disc is reset during rotation. To do Scratches, and minute that the discriminating disc accurately must wait for rotation stationary disk,
There was a problem that it took time.

It is an object of the present invention to provide a disc device which can discriminate a disc accurately and quickly without increasing the number of parts.

[0008]

In order to achieve the above object, the invention according to claim 1 comprises a turntable on which a plurality of types of disks can be mounted, and a spindle motor for rotating the turntable. In a disc device that discriminates the type of disc mounted on the turntable and switches the servo control of the spindle motor based on the discrimination result, a mode switching means for switching between a normal speed mode and a high speed mode at the disc reproducing speed. A measuring means for measuring a time required for switching from the normal speed mode to the high speed mode by the mode switching means, and a disc determining means for determining a disc type based on a measurement result by the measuring means are provided. .

According to a second aspect of the present invention, there is provided control means for controlling the mode switching means to be in the normal speed mode during initialization and to be switched to the high speed mode at the end of initialization.

According to a third aspect of the present invention, a reading means for reading the recording time of the disk during initialization is provided, and the control means, when the recording time read by the reading means is a predetermined time or less, The mode switching means is controlled to switch from the normal speed mode to the high speed mode.

According to a fourth aspect of the present invention, the reading means is
While the disc type is being read during initialization, the control means, when the disc type is read as an audio disc by the reading means, and the read recording time exceeds a predetermined predetermined time, the mode switching means. To maintain the normal speed mode.

[0012]

Therefore, according to the first aspect of the present invention, when the disc is mounted on the turntable to discriminate the disc, the mode switching means drives the spindle motor to rotate in the normal speed mode at the disc reproducing speed. When the servo of the spindle motor is locked in the normal speed mode, the mode switching means switches the spindle motor to the high speed mode at the disk reproducing speed to rotate and drive, and the time required for the servo of the spindle motor to be locked in the high speed mode is set. The type of the disc mounted on the turntable can be accurately discriminated by the disc discriminating unit discriminating the disc type based on the measurement result by the measuring unit.

According to the second aspect of the present invention, the control means controls the mode switching means so that the reproduction speed of the disk becomes the normal speed mode during the initialization, while the reproduction speed of the disk is changed at the end of the initialization. After switching to the high-speed mode, the time required for the servo of the spindle motor to lock in the high-speed mode is measured by the measuring means, and the disk discriminating means discriminates the type of disk based on the measurement result. It is possible to accurately determine the type of the disk while reading the TOC information of the disk mounted on the turntable by the work.

According to the third aspect of the present invention, the control means controls the mode switching means so that the reproduction speed of the disc becomes the normal speed mode during initialization, and the reading means is mounted on the turntable in the initialization operation. The recording time of the disc is read from the TOC information of the recorded disc, and when the read recording time is less than a predetermined time, the control means controls the mode switching means to change the reproduction speed of the disc at the end of initialization. After switching to the high-speed mode, the time required for the spindle motor servo to lock in the high-speed mode is measured by the measuring means, and the spindle motor servo control is switched based on the measurement result. While it can be accurately determined When the recording time read by the reading means exceeds a predetermined time, the disc having a large diameter is discriminated accurately and quickly by discriminating the disc having a large diameter without performing disc discriminating operation. It can be carried out.

According to the fourth aspect of the present invention, the control means controls the mode switching means so that the reproduction speed of the disc becomes the normal speed mode during initialization, and the reading means is mounted on the turntable in the initialization operation. When the disc recording time and the disc type are read from the read TOC information of the disc, the disc is determined to be an audio disc by this reading, and when the read recording time exceeds a predetermined time, the disc It is determined that the audio disc has a large diameter without performing the determination operation, and the control unit controls the mode switching unit to maintain the normal speed mode, thereby accurately and promptly determining the audio disc having a large diameter, In addition, the transition to the reproduction operation can be performed smoothly.

[0016]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing the outline of the electrical construction of a disk device according to an embodiment of the present invention, and FIGS.
2 is a flow chart showing disc discriminating control in the disc device, FIG. 2 is a setting operation of initialization work, FIG. 3 is a discriminating operation when the mounted disc is a data disc, and FIG. 4 is an audio disc mounted. The discrimination operation when the disc is a disc will be described.

In FIG. 1, 1 is a disk on which audio signals or computer data are recorded, 2 is a turntable on which the disk 1 is mounted, 3 is a spindle motor for rotating the turntable 2, and 4 is a spindle motor 3. A spindle motor control circuit for performing servo control and switching the characteristic of the servo control between an 8 cm mode and a 12 cm mode, 5 is a pickup for reading data recorded on a disc 1 mounted on a turntable 2, 6 is a disc for the pickup 5 A slide motor for moving the slide motor 6 in the radial direction (radial direction), a slide motor control circuit 7 for controlling the movement of the slide motor 6, and an amplifier 8 for amplifying the data read by the pickup 5 and a transmission speed of the amplified data at a normal speed. Mode and high speed mode An RF amplifier to change.

A reference numeral 9 subjects the data amplified by the RF amplifier 8 to predetermined signal processing to reproduce it as processed data, and also generates a focus servo signal, a tracking servo signal and a spindle servo signal based on the signal from the RF amplifier 8. Signal processing circuit 10 is signal processing circuit 9
A D / A converter for converting audio data as processed data subjected to predetermined signal processing into an analog signal and reproducing it as an audio signal by 11, a computer as processed data subjected to predetermined signal processing by the signal processing circuit 9. A CD-ROM signal processing circuit for subjecting data to a predetermined signal processing and reproducing it as a data signal, 12 is a spindle motor control circuit 4 and RF based on an operation command signal from an operation unit (not shown) and a signal from the signal processing circuit 9. It is a system control circuit that switches the mode of the amplifier 8 and measures the elapsed time and compares the measured time with a predetermined time, and includes a timer 12a that measures the elapsed time.

When the disc 1 is an audio disc on which an audio signal is recorded, the recorded audio signal is reproduced by reading in the normal speed mode, and when the disc 1 is a data disc on which computer data is recorded, The recorded computer data is reproduced by reading in the high speed mode.

The discriminating operation of the disc 1 mounted on the turntable 2 in the disc device constructed as described above will be described.

Immediately after the disc 1 is mounted on the turntable 2, or when the disc 1 is mounted on the turntable 2 and resetting is performed, the mounting disc 1 is initialized (START). The system control circuit 12 controls the slide motor control circuit 7 to drive the slide motor 6 based on the start command of the initialization work, and the pickup 5 is moved to the inner circumferential side of the disc 1 by the drive of the slide motor ( Step F
1) The signal processing circuit 9 determines whether or not there is a signal read by the pickup 5 at the re-inner circumferential position (step F2), and based on the determination result, whether the disc 1 is mounted on the turntable 2 or not. Detection is performed (step F3), and the detection result is output to the system control circuit 12.

When it is determined by this detection that there is no disc, the system control circuit 12 finishes the initialization work (END), and when it is determined that there is a disc, the system control circuit 12 controls the RF amplifier 8. The reproduction speed mode of the RF amplifier 8 is switched to the normal speed mode (step F4), the spindle motor control circuit 4 is controlled to set the servo control characteristic to the 8 cm mode (step F5), and the spindle motor 3 is driven. Then, (step F6), the turntable 2 having the disk 1 mounted thereon is driven to rotate by the drive of the spindle motor 3, while the signal processing circuit 9 is controlled to perform the focus servo operation.
Tracking servo and spindle servo are applied (step F7).

By locking each servo, it becomes possible to read the recorded information of the disk 1 mounted on the turntable 2. In this state, the TOC (Table Of Of) recorded on the inner peripheral side of the disk 1 is read.
The contents information is read by the pickup 5 (step F8), the information of the type and recording time of the disc 1 is read by the read TOC information, and is output to the system control circuit 12. It is determined whether the disc type is an audio disc or a data disc, and the recording time is the total used capacity recorded on the disc 1 represented by time.

Then, the system control circuit 12 judges the type of the disc 1 (step F9), and if it is judged that the type of the disc 1 is the data disc, then the recording time of the disc 1 is the maximum recording time of 8 cm disc. If it is judged that the recording time of the disk 1 exceeds the maximum recording time of the 8 cm disk, the system control circuit 12 controls the RF amplifier 8 to reproduce the RF amplifier 8. While switching the speed mode to the high speed mode (step F11), the spindle motor control circuit 4 is controlled to set the servo control characteristic to the 12 cm mode (step F12), and the "high speed mode / 12 cm mode" is set in the spindle. While holding in the motor control circuit 4 and the RF amplifier 8, it shifts to the standby state To end the Yaraizu work (EN
D).

Further, in the judgment as to whether the recording time of the disc 1 exceeds the maximum recording time of the 8 cm disc (step F10), it is determined that the recording time of the disc 1 is less than the maximum recording time of the 8 cm disc. Then, the system control circuit 12 controls the RF amplifier 8 to control it.
The system control circuit 1 determines the time required for the spindle servo to lock in the high speed mode while switching the playback speed mode of the above to the high speed mode (step F13).
2 is measured by the timer 12a (step F14), the measurement result is compared with a predetermined time, and if the measurement time is less than the predetermined time, it is determined that the disk is an 8 cm disc. If the measurement time is longer than a predetermined time, it is determined that the disk is a 12 cm disc (step F15).

When it is determined that the disk 1 mounted on the turntable 2 is a 12 cm disk based on the comparison between the measurement time and the predetermined time (step F15), the system control circuit 12 causes the spindle motor control circuit 4 to operate. To set the characteristic of servo control to the 12 cm mode (step F12).
The "cm mode" is held in the spindle motor control circuit 4 and the RF amplifier 8 to shift to the standby state to complete the initial work (END), and based on the comparison between the measurement time and the predetermined time (step F15), the turntable is turned on. When it is determined that the disc 1 mounted on the disc 2 is an 8 cm disc, the system control circuit 12 causes the current "high speed mode /
8 cm mode "spindle motor control circuit 4 and RF
The amplifier 8 holds it and shifts to a standby state to end the initialization work (END).

On the other hand, when the type determination of the disc 1 (step F9) in the system control circuit 12 is determined to be the audio disc,
Thereafter, it is determined whether the recording time of the disc 1 exceeds the maximum recording time of the 8 cm disc (step F16), and when it is determined that the recording time of the disc 1 exceeds the maximum recording time of the 8 cm disc, the system control circuit 12 Controls the spindle motor control circuit 4 to set the servo control characteristic to the 12 cm mode (step F17), while maintaining such "normal speed mode / 12 cm mode" in the spindle motor control circuit 4 and the RF amplifier 8. Moves to the standby state and finishes the initialization work (EN
D).

In the judgment as to whether the recording time of the disc 1 exceeds the maximum recording time of the 8 cm disc (step F16), it is determined that the recording time of the disc 1 is less than the maximum recording time of the 8 cm disc. Then, the system control circuit 12 controls the RF amplifier 8 to control it.
The system control circuit 1 sets the time required for the spindle servo to lock in the high speed mode while switching the reproduction speed mode of the above to the high speed mode (step F18).
The measurement is performed by the timer 12a configured in No. 2 (step F19), and the measurement result is compared with a predetermined time period. As a result, if the measurement time is less than the predetermined time period, it is determined that the disc is an 8 cm disc. If the measurement time is a predetermined time or more, it is determined that the disk is a 12 cm disc (step F20).

When it is determined that the disk 1 mounted on the turntable 2 is a 12 cm disk based on the comparison between the measurement time and the predetermined time (step F20), the system control circuit 12 causes the spindle motor control circuit 4 to operate. Is controlled to set the servo control characteristic to the 12 cm mode (step F21), and the RF amplifier 8 is controlled to switch the reproduction speed mode of the RF amplifier 8 to the normal speed mode (step F22). The "normal speed mode / 12 cm mode" is held in the spindle motor control circuit 4 and the RF amplifier 8 and the standby state is entered to complete the initialization work (END), and the measurement time is compared with a predetermined time (step F20). If it is determined that the disc 1 mounted on the turntable 2 is an 8 cm disc, The stem control circuit 12 controls the RF amplifier 8 to switch the reproduction speed mode of the RF amplifier 8 to the normal speed mode (step F22), and sets such a "normal speed mode / 8 cm mode" to the spindle motor control circuit 4 and the RF motor. The amplifier 8 holds it and shifts to a standby state to end the initialization work (END).

As a method of discriminating between an 8 cm disc and a 12 cm disc (steps F15 and F20), since the servo control characteristic of the spindle motor 3 is set to the 8 cm mode, the reproduction speed is changed from the normal speed mode to the high speed mode. When switching to, the time required until the spindle servo is locked by rotationally driving the turntable 2 with an 8 cm disc and the time required until the spindle servo is locked with rotationally driving the turntable 2 with a 12 cm disc mounted. Comparing with the time required, it takes longer to mount a 12 cm disc than to mount an 8 cm disc.

In this embodiment, in order to determine the diameter of the disc 1 by utilizing the difference in the rising characteristics of the disc 1, the turntable 2 having the 8 cm disc mounted thereon is rotationally driven. The intermediate time between the time required for the spindle servo to lock and the time required for the spindle servo to lock by rotationally driving the turntable 2 on which the 12 cm disk is mounted is preset as the predetermined time, and this is set. The diameter of the disk 1 is determined by comparing the time with the time required for the spindle servo to lock when the reproduction speed is switched from the normal speed mode to the high speed mode.

Therefore, the characteristics of servo control of the spindle motor 3 can be optimally set according to the disc 1 mounted on the turntable 2 by the initializing work, and at the same time, the reproducing speed of the disc 1 is optimally set. The disc 1 mounted on the turntable 2 can be quickly discriminated by appropriately changing the disc 1 discriminating operation according to the type of the disc 1 mounted on the turntable 2. .

[0034]

As described above, according to the first aspect of the invention, after the servo of the spindle motor is locked in the normal speed mode, the spindle motor is switched to the high speed mode at the disk reproducing speed and rotationally driven, By discriminating the type of disc based on the result of comparison between the time required for the servo of the spindle motor to lock in the high speed mode and a predetermined time, regardless of the rotation state of the disc mounted on the turntable, The type of disk can be accurately and quickly determined, and by switching the servo control of the spindle motor based on the disk determination result, the servo control of the spindle motor can be performed according to the disk mounted on the turntable. The characteristics can be set optimally.

According to the second aspect of the present invention, the reproduction speed of the disk is set to the normal speed mode during initialization, while the reproduction speed of the disk is switched to the high speed mode at the end of the initialization, and the spindle motor is operated in the high speed mode. By discriminating the type of disc based on the result of comparison between the time required for the servo to lock and a predetermined time, the disc type can be accurately determined regardless of the rotation state of the disc mounted on the turntable. In addition, it is possible to make a quick discrimination, and the initialization work can be performed in a short time by reading the TOC information of the disk mounted on the turntable by the initialization work.

According to the third aspect of the present invention, while the reproduction speed of the disc is set to the normal speed mode during the initialization, the recording time of the disc read from the TOC information of the disc in this initialization work is predetermined. When the initialization is completed, the disc playback speed is switched to the high-speed mode when the initialization is completed, and the time required until the spindle motor servo locks in the high-speed mode is compared with the predetermined time based on the comparison result. By discriminating the type of disc, it is possible to discriminate the disc type accurately and quickly, while when the read recording time exceeds a predetermined time, the disc diameter is determined without disc discriminating operation. The turntable can be identified as a large disc. It can be carried out further in a short time initialization operations according to the loaded disc.

According to the fourth aspect of the present invention, while the reproduction speed of the disc is set to the normal speed mode during the initialization, the type of the disc read from the TOC information of the disc in the initialization work is the audio disc. If it is determined that the disc is recorded and the recorded time exceeds the predetermined time set in advance, it can be discriminated as an audio disc having a large diameter without performing disc discriminating operation. When the disc mounted on the turntable is an audio disc with a large diameter, the initialization work can be performed in a shorter time according to the disc that is played, and the disc playback speed is maintained in the normal speed mode. Smooth transition to playback Because, it is possible to eliminate the discomfort to the user due to the delay of the transition to the initialization work and playback operation.

[Brief description of drawings]

FIG. 1 is a block diagram showing an outline of an electrical configuration of a disk device that is an embodiment of the present invention.

FIG. 2 is a flowchart showing a setting operation of an initialization work in the disc reproducing apparatus.

FIG. 3 is a flowchart showing a disc discriminating operation when the disc loaded in the disc reproducing apparatus is a data disc.

FIG. 4 is a flowchart showing a disc determining operation when the disc loaded in the disc reproducing apparatus is an audio disc.

[Explanation of symbols]

 1 Disc 2 Turntable 3 Spindle Motor 4 Spindle Motor Control Circuit 5 Pickup 6 Slide Motor 7 Slide Motor Control Circuit 8 RF Amplifier 9 Signal Processing Circuit 10 D / A Converter 11 CD-ROM Signal Processing Circuit 12 System Control Circuit

Claims (4)

[Claims] 1. A turntable capable of mounting a plurality of types of discs, and a spindle motor for rotating the turntable, discriminating the types of discs mounted on the turntable, and a spindle based on the discrimination result. In a disk device for switching the servo control of a motor, a mode switching unit for switching between a normal speed mode and a high speed mode at a disk reproduction speed, and a time required for switching from the normal speed mode to the high speed mode by the mode switching unit are measured. And a disc determining unit that determines the type of disc based on the measurement result of the measuring unit. 2. The disk device according to claim 1, further comprising control means for controlling the mode switching means to switch to a normal speed mode during initialization and to switch to a high speed mode at the end of initialization. 3. A reading means for reading the recording time of the disc during initialization is provided, and the control means controls the mode switching means when the recording time read by the reading means is a predetermined time or less. 3. The disk device according to claim 2, wherein the normal speed mode is switched to the high speed mode. 4. The reading unit reads the disc type during initialization, while the control unit reads the disc type as an audio disc by the reading unit, and a predetermined recording time determined in advance. 4. The disk drive according to claim 3, wherein when the time is over, the mode switching means is controlled to maintain the normal speed mode.