JP2002056549A - Disk reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk reproducing device which is capable of rapidly reading TOC information, expediting the starting time of a disk and shortening the time for assembly by exactly moving a pickup within a TOC region. SOLUTION: The disk reproducing device has the pickup 1, a lead-in switch 21, a threading motor 4 having Hall elements 5a and 5b and a microcomputer 15 for control which controls this threading motor 4. The lead-in switch 21 stops the pickup 1 and has address information read after counting the prescribed number of pulses upon turning on of the lead-in switch 21, computes the difference between the read address information and the prescribed target address information within the TOC region and controls the threading motor 4 in turning on again of the power source by the number of pulses obtained by converting the difference to the number of pulses and adding and subtracting the number of pulses obtained by the conversion to and from the prescribed number of pulses described above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk reproducing apparatus having a lead-in switch, which absorbs a mounting error of the lead-in switch and reduces the TOC of the disk.
The present invention relates to a disc reproducing apparatus capable of accurately stopping a pickup in a (Table Of Contents) area, reading TOC information in a short time, shortening a start-up time of the disc reproducing apparatus, and shortening an assembling time.

[0002]

2. Description of the Related Art To reproduce a disk on which information signals such as audio signals or image signals are recorded, TOC (Table Of Contents) information indicating the start address of digital data for all digital data is used. By performing the search automatically by referring to the corresponding start address according to the designation, the desired digital data can be easily and selectively reproduced.

For this reason, the TOC information needs to be reproduced on the disk before the reproduction of the digital data is started. When the disk is mounted on the disk reproducing apparatus, first, the TOC area in which the TOC information is recorded is recorded. Search is performed.

In a read-only device, there is no fear of erasing data. Therefore, there is no read-in switch, the address information of the disk is read from the stationary position of the pickup, and the TOC information is read by searching the TOC area. However, in general, when starting up a disc player,
If the position of the pickup is unknown and the playback is started from a place where the position of the pickup is unknown, the laser irradiation time becomes longer because the specified number of revolutions of the disc is unknown.
There is a risk that the recorded data will be erased. For this reason, usually, after moving the pickup to the TOC area where there is no fear of erasing the recorded data, the disc is reproduced,
Extract TOC information.

[0005] In particular, in the case of a disk provided with a super-resolution layer, during reproduction, the reproducing portion of the disk is set to a temperature lower than the Curie point of the recording layer and higher than the Curie point of the super-resolution layer. The laser power must be controlled. Therefore, when reproducing a disk provided with a super-resolution layer, the laser power becomes larger than when reproducing a disk having no super-resolution layer. Cannot read the address information, and it is necessary to surely move the pickup to the TOC area.

[0006] The TOC area is provided in a lead-in area inside or outside the data area where main data information of the disc is recorded. When it is detected that the pickup is in the TOC area, reading of the TOC data is started. It is supposed to.

Conventionally, TOC data is read by using a lead-in switch because the position of the pickup is unknown when the disk reproducing apparatus is started up. When it is detected that the pickup is at the start end of the TOC area, for example, the TOC data is read.
The reading of the OC data is started. For this reason, the pickup is moved by the sled motor until the lead-in switch is turned on, the sled motor is stopped when the lead-in switch is turned on, and the operation of reading the TOC information of the disk is performed at the position.

However, in general, the position of the lead-in switch is often manually adjusted while reproducing the reference disk before shipping the disk reproducing apparatus.

For this reason, the mounting accuracy of the lead-in switch varies. For this reason, although the same information is repeatedly recorded in the TOC area, even if the pickup moves into the TOC area due to the movement of the pickup by the thread motor, it moves to the end of the TOC area, When the information is read out halfway, and when the remaining information is not recorded any more, the reproduction of the digital data in the main data area is started without completely reproducing the TOC information. Therefore, in such a case, move again to T
It is necessary to completely read the OC information.

Therefore, for example, Japanese Patent Application Laid-Open No. Sho 59-12163
As shown in FIG. 8, the disc reproducing device described in Japanese Patent Publication No.
After the position detection switch No. 01 is turned on, data obtained from an address detector (not shown) is read, and every time a state where the light beam spot of the pickup 101 is on the inner peripheral side of the TOC area 102 of the disk 102 is detected. By automatically moving the pickup 101 by a predetermined width in the outer circumferential direction of the disk 102, the TOC area 10
The pickup 101 is moved a plurality of times by a predetermined width until the pickup 101 is detected by the pickup 101, and when the pickup 101 enters the TOC area 103, the TOC information is read out to move the pickup securely into the TOC area 103, Also, the mounting of the switch for detecting the position of the pickup does not require an extremely precise mounting operation, and an efficient assembling operation can be performed.

[0011]

However, the disc reproducing apparatus described in Japanese Patent Laid-Open Publication No. Sho 59-121633 detects a state where the light beam spot of the pickup 101 is on the inner peripheral side of the TOC area 102 of the disc 102. In this case, it is necessary to read the data obtained from an address detector (not shown) each time, and to move the pickup 101 by a predetermined width in the outer circumferential direction of the disk 102 each time.
Therefore, there is a problem that it takes time to move the pickup 101 to the TOC area 102.

In particular, the disc reproducing apparatus automatically moves the pickup 101 by a predetermined width toward the outer periphery of the disc 102, so that the pickup 101 jumps to the start end in the TOC area 103 in order to surely move the pickup 101. The width cannot be set too large. For this reason, the start-up time of the disk 102 becomes longer.

On the other hand, if the jump width is increased to solve this, even if the pickup can be moved into the TOC area, it can always be moved to a position where the TOC information can be completely read out. There is a risk of disappearing.

In the above-mentioned disc reproducing apparatus, the pickup 101 is moved by a predetermined width toward the outer periphery of the disc 102 after the position detection switch of the pickup 101 is turned on, regardless of the mounting position of the pickup position detection switch. Because of the automatic movement, the position of the TOC region that arrives first is not constant. For this reason, the TOC information cannot always be reproduced from the beginning,
If the C information is reproduced from the middle, it takes a long time to read necessary TOC information. And
Such a problem can also occur due to variations in eccentricity of the disk, variations in disk chucking, and the like.

Although not intended to move the pickup into the TOC area, the movement between the mounting position of the rest switch for detecting that the pickup is at the standby position and the desired position on the disc is not described. By storing the amount and moving the pickup to a desired position on the disk based on the stored movement amount, errors such as the mounting position of the rest switch and the eccentricity of the disk are corrected, and the mounting of the rest switch is performed. As a disk reproducing apparatus which does not require a precise operation and can perform mounting adjustment of a rest switch in a shorter time than before, a disk reproducing apparatus described in Japanese Utility Model Laid-Open No. 59-112352 is known. ing.

The disc reproducing apparatus corrects an error such as a mounting position of a rest switch from information obtained by reproducing the TOC area, and accurately detects a recording start position of a program on the disc to reproduce the disc. In the middle or at the end of the playback of all programs, when the playback needle is slid in the outer circumference of the disc in order to move to the beginning from the first position of the entire recording program and play it again, the reference due to the mounting error of the rest switch To prevent the playback needle from hitting or exceeding the groove guard of the disc due to overshoot of the feed mechanism when the position deviates from the set value, use the following method to install the rest switch or bias the disc. Errors such as core variation are corrected.

That is, as shown in FIG. 9, the disk reproducing apparatus first sets a rest switch O which is turned on when the pickup 201 is at the rest position (standby position).
The counter (not shown) is reset by the input signal at the time of N.
Measure the number of pulses generated by the photo sensor from when it is transferred from the rest position in the inner circumferential direction, which is the direction of the arrow in FIG. The value of this counter is constantly compared with reference data recorded in a memory (not shown) by a comparison circuit (not shown). Before starting the reproduction of the disk 202, the memory stores the distance from the rest switch to the vicinity of the center position of the TOC area 203 of the disk 202 by a pulse output by a photo sensor (not shown) during the time when the pickup 201 is transferred. Reference data having a value equal to the number is recorded. When the value of the counter matches the value of the reference data in the memory, a match signal is output, the feed motor is set to a slower speed during normal reproduction than before, and a signal is sent to a stylus pressure coil (not shown) in the pickup 201. Is applied, and the reproducing needle contacts the disk 201. The position where the reproduction needle contacts the disk 202 is the TOC area 203 (lead-in area) on the outer peripheral side from the initial position of the entire recording program of the disk 202. The regeneration needle is driven by a feed motor.
In FIG. 9, the disk is transferred while sliding on the disk 201 at the speed at the time of normal reproduction in the direction of the arrow, and the start position of the recording program on the disk 201 (TOC area and program recording range (hereinafter referred to as PA) 204) The boundaries) to play. From this reproduced signal, a program start position detection circuit (not shown) detects the start position of all recording programs, outputs a detection signal, and loads the measured value of the counter at this time into the memory. Thus, the value supplied from the memory to the comparison circuit is changed from the reference data to a measured value indicating the recording start position of the recording program. Thus, by reproducing the TOC area, an accurate value indicating the recording start position of the program is updated and recorded in the memory.

However, the above-mentioned disc reproducing apparatus has
This is to detect the start position of the entire recording program while reproducing the TOC area, and it is necessary to count the number of pulses while reproducing and compare it with the set count value. For this reason, even if the disc reproducing apparatus can surely move to a desired position on the disc, it cannot move to the desired position on the disc in a short time.

For this reason, the above-mentioned disc reproducing apparatus is referred to as TO
Even when applied to the movement of the pickup to a desired position in the C area, the pickup cannot be moved to the desired position in the TOC area in a short time. Moreover, in the above-described disc reproducing apparatus, fine adjustment is not actually performed when moving to the TOC area, and the TO
There is no disclosure of moving to a desired position in the C area, and no consideration is given to obtaining TOC information by reading TOC information once.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to absorb lead-in switch mounting errors, disk eccentricity variations, disk chucking variations, etc. Another object of the present invention is to provide a disk reproducing apparatus capable of moving a pickup to read TOC information quickly to shorten the start-up time of the disk and shorten the assembly time.

[0021]

That is, a disk reproducing apparatus according to the present invention has the following features to solve the above-mentioned problems.
TO with TOC information recorded on the inner or outer periphery
In a disc reproducing apparatus for reproducing a disc having a C area and a data area (for example, a main information area) in which main data information is recorded on an outer peripheral portion or an inner peripheral portion of the TOC area, information recorded on the disc is provided. And a pickup for reading the data, which is provided close to the TOC area of the disc, and is turned on / off by the movement of the pickup.
F: a lead-in switch, a pickup moving means (for example, a sled motor) for moving the pickup in the radial direction of the disk, and a pulse generating means (for example, provided on a sled motor) for generating a pulse in accordance with the amount of movement of the pickup. Hall element), counting means (for example, a speed / movement distance calculation circuit) for counting the number of pulses generated by the pulse generation means, and when the disk is mounted on the disk reproducing apparatus, the pickup is driven by the disk. Control means (for example, a control microcomputer (control circuit)) for controlling the pickup moving means so as to move in the inner or outer peripheral direction of the pickup, and the control means operates when the lead-in switch is turned on. After counting a predetermined number of pulses from, the operation of the pickup moving means is stopped. Then, the address information on the disk at this position is read by the pickup, a difference between the read address information and target address information in a preset TOC area is calculated, and this difference (that is, the calculated value) is calculated. The first difference pulse number (that is, the pulse number based on the difference between the address information at the operation stop position of the pickup moving means and the predetermined reference address information) obtained by the conversion is converted to the lead-in number. The number of pulses required until the target address is reached after the lead-in switch is turned on is calculated by adding or subtracting from the predetermined number of pulses counted since the switch was turned on. Using this number of pulses,
When the power is turned on again, the pickup moving means is controlled so that the pickup moves in the inner or outer peripheral direction of the disk by the number of pulses after the lead-in switch is turned on.

According to the above configuration, the first difference pulse number is added to or subtracted from the predetermined number of pulses counted after the lead-in switch is turned on, so that the target number of pulses after the lead-in switch is turned on is set. Since the exact number of pulses required to reach the address can be obtained, it is possible to absorb the mounting error of the lead-in switch, the eccentric variation of the disk, the variation of the disk chucking, and the like. For this reason, when the disc reproducing apparatus is started up, the mounting position of the lead-in switch is in a state equivalent to the corrected position, and the pickup can be reliably moved to the target address in the TOC area. Reading can be performed, and the start-up time of the disk reproducing device can be reduced.

In a disk in which recorded data is erased when the temperature exceeds a predetermined temperature, the TOC area is an area where data is not erased, and is re-started when the disk is started or when the disk reproducing apparatus becomes abnormal. When starting up, it is necessary to start up from the TOC area without fail, but the above-mentioned disc reproducing apparatus can move to the TOC area reliably in a short time. For this reason, even in a disk provided with a super-resolution layer, the TOC information can be read immediately without erasing the recorded data, and the start-up time of the disk reproducing apparatus can be reduced. .

Further, according to the above configuration, when the disk reproducing apparatus is started up, the mounting position of the lead-in switch is in a state equivalent to the corrected position, and the pickup is reliably moved to the target address in the TOC area. Therefore, the mounting accuracy of the lead-in switch at the time of assembling the disk reproducing device is hardly required. Therefore, precise adjustment of the mounting position of the lead-in switch is not required, and the time required for the assembling operation can be reduced.

Therefore, according to the above configuration, both the time required for assembling the disk reproducing apparatus and the time required for starting up the disk reproducing apparatus can be shortened, and there is no danger of erasing recorded data. In addition, one time TOC
A disk reproducing device capable of reading information can be provided.

In the disk reproducing apparatus according to the present invention, in order to solve the above-mentioned problem, the control means sets the lead-in switch to ON from the beginning when the power of the disk reproducing apparatus is turned on again. In this case, the pickup is once sent in the inner or outer circumference of the disk for a certain period of time until the lead-in switch is turned off, and after confirming that the lead-in switch is turned off, the pickup is moved in the opposite direction to the moving direction. It is characterized in that the pickup moving means is controlled so as to send in the direction.

Depending on the situation when the power of the disc reproducing apparatus is turned off, the pickup may be outside the TOC area on the inner or outer circumference of the disc when the lead-in switch is turned on when the power is turned on again. Can be
In this case, especially when the position of the pickup is in the mirror area, there is a possibility that the start-up of the disc reproducing apparatus may be hindered. In addition, in order to perform accurate movement to the TOC area, it is necessary to perform movement using the time when the lead-in switch is turned on as a reference position. Therefore, when the power supply is turned on again, the lead-in switch is turned off.
In the case of N, if the disc is outside the TOC area on the inner or outer circumference of the disc, it is necessary to temporarily move the pickup out of the lead-in area. Therefore, according to the above configuration, in such a case, the pickup is temporarily moved out of the lead-in area, and after confirming that the lead-in switch is turned off, is sent in the direction opposite to the moving direction. This makes it possible to optimally start up the disc reproducing apparatus by the method described above.

Further, in order to solve the above-mentioned problems, the disk reproducing apparatus according to the present invention further comprises a non-volatile memory, and the non-volatile memory controls the above-mentioned control when the disk is of a standard standard. The first difference pulse number obtained by the means is held.

According to the above arrangement, before shipping the disk reproducing apparatus, an error such as a mounting position of a lead-in switch is calculated from address information using a standard-standard disk, and the movement amount is replaced with a pulse. By holding the lead-in switch, the mounting position of the lead-in switch is apparently corrected. Therefore,
Even when the disc reproducing device is shipped, the disc reproducing device in which the mounting position of the lead-in switch has been corrected can be shipped without performing the precise adjustment of the mounting position of the lead-in switch.

Further, in order to solve the above-mentioned problems, in the disk reproducing apparatus according to the present invention, the control means includes a step of, when a new disk is mounted on the disk reproducing apparatus and reproducing the disk, When the power of the reproducing apparatus is turned on, the first difference pulse number stored in the nonvolatile memory is read out, and the read-in switch is turned on based on the first difference pulse number. After the pickup is moved by the pickup moving means by the number of pulses obtained by adding the predetermined pulse number to the first differential pulse number, the operation of the pickup moving means is stopped, and the pickup moves the disk on the disk at this position. The address information is read, and a difference between the read address information and target address information in a preset TOC area is calculated. , The second seek speed difference pulse by converting the difference in the number of pulses, the number of the second differential pulse,
Holding the disk until the disk is removed, and controlling the movement of the disk from the next power-on using the disk using the first differential pulse number and the second differential pulse number. It is characterized by.

According to the above configuration, the first and the second
By using the difference pulse number as the correction data, it is possible to reliably and optimally move the pickup to the TOC area of the disk mounted on the disk reproducing apparatus. In particular, the pickup can be reliably moved to the TOC area even when reproducing a nonstandard disc or the like.

In order to solve the above-mentioned problems, in the disk reproducing apparatus according to the present invention, when the power of the disk reproducing apparatus is turned on again, the control means controls the pickup to be moved by the pickup moving means, and the lead-in switch. Is sent at a constant speed until is turned on. From the time the lead-in switch is turned on until the target address is reached, the output of the pickup moving means is gradually lowered,
The output of the pickup moving means is controlled so that the pickup stops accurately at the target address.

According to the above configuration, during the period from when the lead-in switch is turned ON to when the target address is reached,
By gradually lowering the output of the pickup moving means, the pickup can be accurately stopped at the target address in the TOC area.

In order to solve the above-mentioned problems, in the disk reproducing apparatus according to the present invention, when the power supply of the disk reproducing apparatus is turned on again, the control means controls the pickup to be moved by the pickup moving means to the lead-in switch. Is turned on at a constant speed during counting for the first difference pulse number, and thereafter, the output of the pickup moving means is slightly reduced while counting for the predetermined pulse number until the pickup reaches the target address. The output of the pickup moving means is controlled so that the pickup stops accurately at the target address.

According to the above configuration, the pickup is fed at a constant speed for a period equal to the number of first differential pulses after the lead-in switch is turned on, and then the pickup reaches the target address. By gradually lowering the output of the pickup moving means while counting for the predetermined number of pulses up to, the pickup can be stopped accurately and quickly at the target address in the TOC area.

In order to solve the above-mentioned problems, in the disk reproducing apparatus according to the present invention, when the power of the disk reproducing apparatus is turned on again, the control means controls the pickup to be moved by the pickup moving means to the lead-in switch. Is turned on, the motor is fed at a constant speed during counting for the number of pulses obtained by adding the second differential pulse number to the first differential pulse number, and thereafter, for a predetermined number of pulses until the pickup reaches the target address. During the counting, the output of the pickup moving means is gradually decreased, and the output of the pickup moving means is controlled so that the pickup stops accurately at the target address.

According to the above configuration, the pickup is fed at a constant speed for a period equal to the number of first differential pulses after the lead-in switch is turned on, and then the pickup reaches the target address. By gradually lowering the output of the pickup moving means while counting for the predetermined number of pulses up to, the pickup can be stopped accurately and quickly at the target address in the TOC area.

In order to solve the above-mentioned problems, in the disk reproducing apparatus according to the present invention, when the control means lowers the output of the pickup moving means, the control means controls the output of the pickup moving means so that the pulse generation means outputs the pulse. It is characterized in that it is lowered in synchronization with the generated pulse.

According to the above construction, the output of the pickup moving means is gradually decreased in synchronization with the pulse generated by the pulse generating means, so that a sudden brake is applied to stop the pickup at the target address. Since there is no need, power consumption can be reduced.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [Embodiment 1] An embodiment of the present invention will be described below with reference to FIGS. 1 to 7 (a) and 7 (b).

As shown in FIG. 2, a disk 30 as a recording medium has an inner peripheral mirror on which no signals are recorded at its innermost periphery, that is, around a center hole 31 provided at the center of the disk 30. A region 32 is provided, and TOC (Tabl) is provided on the outer peripheral side of the inner peripheral mirror region 32.
e Of Contents) A lead-in area 33 which is also a TOC area in which information is recorded is formed.

In the TOC area, a manufacturer of the disk 30 records manufacturing information at the time of manufacturing the disk 30, for example, optimum power information of a laser beam at the time of recording or reproduction of the disk 30 by forming a wobble. Therefore, wobbles are continuously formed. For this reason, the TOC information is already recorded when the user obtains the disc 30, and cannot be deleted. TO
The same TOC information is repeatedly recorded in the C area.

A main information area 34 is provided as a data area in which main data information is recorded, for example, on the outer peripheral portion of the lead-in area 33 which is also a TOC area. The main information area 34 occupies most of the area outside the lead-in area 33, and a plurality of, for example, 1
A zone divided into seven is formed. This zone is referred to as zone 1, zone 2,..., Zone 17 from the inner circumference to the outer circumference.

On the outer peripheral side of the main information area 34, a lead-out area 35 and an outer peripheral mirror area 36 are provided.
They are formed in this order from the inner peripheral side. Here, the TOC area of the lead-in area 33 on the inner peripheral side corresponds to zone 0,
The outer peripheral side lead-out area 35 corresponds to the zone 18.

The disk 30 has a so-called zone CLV.
(Constant Linear Velocity) rotation control is performed. In the zone CLV system, the number of rotations in each zone is controlled to be constant. That is, in each zone, so-called CAV (Constant Angular Velocity)
Control is performed, and the fixed rotation speed of each zone is determined so that the linear velocity in each zone is substantially constant. Therefore,
The rotation speed decreases as the zone is closer to the outer periphery.

[0046] The disc 30 is used by placing the disc reproducing apparatus according to this embodiment, when it is placed on the disc reproducing apparatus, typically, G ₁ direction shown in FIG. 1, i.e., the disc While receiving the gravity vertically downward relative to the 30 disk surface of, depending on the orientation of the disk reproducing apparatus, the horizontal direction to the disk surface of the disk 30, i.e., the G ₂ direction or the opposite direction shown in FIG. 1 to become G ₃ direction may be subject to gravity.

As shown in FIG. 1, the disk reproducing apparatus according to the present embodiment is provided with a pickup 1 for reading information recorded on a disk 30 and a pickup 1 opposed to the disk 1 so as to sandwich the disk 30. The radial direction of the disk 30 along the disk surface of the disk 30, that is, the inner peripheral side that is the center direction of the disk 30 and the outer peripheral side that is the opposite direction are provided so as to be integrally movable with the pickup 1, A magnetic head 2 for applying a magnetic field based on a data signal to the disk 30 and a spindle motor 3 for supporting and rotating the disk 30 are provided.

The disk 30 is recorded by a laser strobe magnetic field modulation method. The disk 30 is
A magnetic field based on the data signal is received from the magnetic head 2 and a predetermined portion of the disk 30 is heated to a temperature equal to or higher than the Curie point based on the pulsed laser beam from the pickup 1. Is done. Thereafter, when the temperature of the recording portion drops to a temperature lower than the Curie point, the magnetization is fixed and held at the magnetization oriented as described above. At this time, since the emitted light by the laser beam is pulse emission, the pitch of the recorded signal is very narrow, and high-density recording becomes possible.

The disk reproducing apparatus includes a sled motor 4 serving as a driving means as a pickup moving means for moving the pickup 1 in the radial direction of the disk 30 and converting the rotational drive of the sled motor 4 into a linear drive. The pickup 1 is provided with an intermediate transmission means (not shown).
By converting the rotational drive of the disk 30 into a linear drive, the magnetic head 2 moves integrally with the magnetic head 2 along the disk surface of the disk 30 in the center direction of the disk 30 and in the opposite direction.

A ring-shaped magnet (magnet) (not shown) having an N-pole and an S-pole alternately magnetized is provided inside the thread motor 4 and is rotated so as to face the magnet. Two Hall elements 5a and 5b (pulse generating means) that rotate integrally with the plate (rotor) are provided. The magnets are Hall elements 5a and 5
It is provided on a rotating plate (rotor) facing b. The Hall elements 5a and 5b are provided at a predetermined interval (a predetermined angle) from each other, and generate a pulse in accordance with the amount of movement of the pickup 1.

The disc reproducing apparatus includes a lead-in switch 21 which will be described later, which is provided close to the TOC area of the disc 30 and is turned on / off by the movement of the pickup 1.
2. Digital servo processing circuit 13, PWM (Pulse Wid
th Modalation) signal generation circuit 14, control microcomputer 1
5 and a control circuit 11 comprising a non-volatile memory 16. Each circuit is provided with the control microcomputer 15 (control means).
Is controlled by

The output signals a and b of the hall elements 5a and 5b, which are output signals of the hall elements 5a and 5b, are sent to a speed / movement distance calculation circuit 8 (counting means) in the control circuit 11. In the speed / movement distance calculation circuit 8, a thread pulse signal is created based on the Hall element output signals a and b, and the number of pulses after the lead-in switch 21 is turned on is counted. The control microcomputer 15 calculates, for example, the speed and the moving distance of the movement of the pickup 1 in the direction of the center of the disk or in the opposite direction with respect to a predetermined target address based on the center position of the TOC area of the disk 30. The calculation result is sent to the digital servo processing circuit 13 in the control circuit 11 as a signal d.

The above-described thread motor 4 has a PWM signal generation circuit 14 based on a signal e generated by the digital servo processing circuit 13 from a result calculated based on the thread pulse signal from the speed / movement distance calculation circuit 8. It is driven by a thread motor drive signal g from the PWM driver 9 generated based on the generated PWM signal f.

By counting the thread pulse signal, the difference between the read address and the predetermined target address calculated by the control microcomputer 15 is converted into the number of pulses by the control microcomputer 15. Are recorded in the nonvolatile memory 16 and used when the power is turned on again.

The objective lens provided in the pickup 1 is driven by an objective lens drive signal h from the PWM driver 9. The objective lens drive signal h includes a signal (RF (Radio Frequency) signal i,
The digital servo processing circuit 13 is based on the signals output from the RF (Radio Frequency) processing circuit 6 based on the optical detection signal j) (each error signal k, shift signal 1 and signal n).
Is generated based on the PWM signal p generated by the PWM signal generation circuit 14 based on the signal o generated by the above.

In the RF processing circuit 6, the pickup 1
The signal (RF signal i, photodetection signal j) detected as light and output as a current signal is converted into a voltage signal.

Among the light detection signals j detected by the pickup 1 and output as current signals, the light detection signal corresponding to the RF signal i is composed of two signals having opposite phases. After the transmission, the RF processing circuit 6 obtains a difference signal (signal n; a substantial sum signal) between the two signals, performs AGC (Automatic again control) processing, and transmits the signal to the signal processing circuit 12. In the signal processing circuit 12, error correction, deinterleaving, NRZI (non-retur
The data is subjected to n-to-zero inverted code) conversion, Viterbi composite, and the like, and is sent to the interface 17 for subsequent connection.

On the other hand, of the light detection signals j detected by the pickup 1 and output as current signals, the light detection signal corresponding to the error signal is also sent to the RF processing circuit 6,
The processing circuit 6 generates the error signal k and the shift signal l.

The error signal k generated by the RF processing circuit 6 is supplied to an analog / digital converter 7 (hereinafter ADC (a
The digital signal m is sent to a digital servo processing circuit 13 to generate a final error signal.

The digital servo processing circuit 13
Mainly, digital signal processor (DSP)
gnal processor).

In the digital servo processing circuit 13,
A synchronization signal obtained from the RF signal i is subjected to PLL processing by a PLL (phase-locked loop) circuit (not shown) based on the master clock. This PLL processed signal q is P
The signal is sent to the WM signal generation circuit 14 to be converted into a PWM signal, so that the
The signal r is output as a spindle motor drive signal s via the spindle motor driver 10 to control the rotation of the spindle motor.

The spindle motor 3 is driven by an FG (Frequen
cy Generator) Although it is a motor, it is controlled by the above-described PLL circuit when recording or reproduction is being performed, that is, when tracking is being performed, but is controlled by FG servo at the time of disk rotation start and long search. .

Here, the FG servo will be described. When the spindle motor drive signal s is output from the spindle motor driver 10 and the spindle motor 3 is driven to rotate by the spindle motor drive signal s, the signal t relating to the rotation of the spindle motor 3 itself is output from the spindle motor 3 to the spindle motor driver 10. And the waveform is shaped there, and converted into a signal processing circuit 12 as an FG signal u.
Sent to The signal processing circuit 12 compares the desired rotation speed of the spindle motor 3 in the zone where the pickup 1 is located on the disk 30 with the FG signal u obtained from the feedback signal t to generate an error signal v. Is done. The error signal v is sent to the digital servo processing circuit 13, where the source signal w of the spindle motor drive signal s is generated based on the error signal v and sent to the spindle motor driver 10 via the PWM signal generation circuit 14. Can be The FG servo is performed in the above loop.

The focus error signal x and the tracking error signal y obtained by the digital servo processing circuit 13 are also input to the PWM signal generation circuit 14,
After the conversion, focus control and tracking control are performed via the PWM driver 9.

For the tracking servo, pickup 1 →
Main loop of RF processing circuit 6 → ADC 7 → digital servo processing circuit 13 → PWM signal generation circuit 14 → PWM driver 9 → pickup 1 and pickup 1
(Hall elements 5a and 5b) → Speed / movement distance calculation circuit 8
It is controlled by two sub-loops: a digital servo processing circuit 13, a PWM signal generation circuit 14, a PWM driver 9, and a pickup 1. The above-described series of controls is performed by the control microcomputer 15.

The magnetic head 2 is driven by a magnetic head driving circuit 18 based on the signal A from the signal processing circuit 12.
Thus, at the time of disk recording, the disk 30 is irradiated with a laser beam at a constant intensity, the temperature of the magnetic film is raised to a temperature equal to or higher than the Curie point, the magnetic field is concentrated near the spot, and the signal A from the signal processing circuit 12 is While being magnetized in accordance with the data, based on the signal B from the microcomputer 15 for control, the magnetic head motor 20 drives the magnetic head motor 20 via the magnetic head elevating drive circuit 19 so as to slide on the disk 30 during recording. When the recording is completed, the magnetic head is moved upward by a magnetic head motor 20 via a magnetic head lifting / lowering drive circuit 19 in a direction away from the disk 30. The magnetic head 2 and the pickup 1
Are paired.

Next, the reproducing operation procedure of the above-mentioned disk reproducing apparatus will be described. When the disc 30 is mounted on the disc reproducing apparatus, first, the TOC area of the disc 30 is searched. At this time, the TOC information can be read as soon as possible.
It is necessary to make it possible to reach the vicinity of the TOC region only by a coarse search or a rough search, instead of a normal search in which a tracking search is repeated after a coarse search, so that.

In the rough search, the location data of the pickup 1 and the address data of the target location are compared to calculate how many tracks must be crossed, and the thread motor 4 is operated based on the calculation result. In this embodiment, the pickup 1 is moved to the vicinity of the TOC area.
A rough search that is more rough than the rough search is performed so that the pickup 1 reaches the TOC area even a little faster.

The rough search needs to reproduce the disk 30 and read the address information of the disk 30, whereas the rough search does not need to reproduce the disk 30. For this reason,
This rough search does not calculate the number of crossing tracks as described above, but simply moves the pickup 1 until the lead-in switch 21 switches, and stops the rotation of the thread motor 4 when the lead-in switch 21 switches. It is a very simple thing to stop.

However, since the mounting accuracy of the lead-in switch generally varies, the TOC
Although the same information is repeatedly recorded in the area, due to the movement of the pickup by the thread motor,
Even if the pickup moves into the TOC area, the TO
When the terminal moves to the end of the C area, when the TOC information is read from the middle, or when the remaining information is not recorded any more, the digital data in the main data area is reproduced without completely reproducing the TOC information. Will be started.

Then, when the pickup 1 is moved to the TOC area, the pickup 1 is stopped surely and accurately in the TOC area so that the TOC information can be surely obtained by reading the TOC information one time. With reference to FIGS. 7A and 7B, the feed control of the pickup 1 in the disk reproducing apparatus according to the present embodiment will be described.
The feed control is performed under the control of the control microcomputer 15.
The pickup 1 is stopped by the lead-in switch 21 and the thread motor 4 with the Hall elements 5a and 5b based on the thread feed profile obtained based on the speed / position information from the speed / movement distance calculation circuit 8, The feed of the pickup 1 is corrected and controlled on the basis of the obtained address information. Specifically, the feed is performed as described below.

First, as shown in FIG. 3, the position of the pickup 1 is unknown at the time of initial power-on of the disk reproducing apparatus. Therefore, it is confirmed that the lead-in switch 21 is not turned on. At a constant speed, the pickup 1 is turned on, and the lead-in switch 21 is turned on.
To the position (X _{1 in} FIG. 3).

ON / OFF of the lead-in switch 21
For example, as shown in FIG. 6, the switching is performed by moving the pickup 1 and turning on / off a mechanical switch 41 provided facing the disk surface.

As shown in FIGS. 7A and 7B,
The on / off of the lead-in switch 21 can be switched by moving the pickup 1 and transmitting or blocking the light beam in the photo-interrupter 51 by the plate-shaped light blocking member 1a provided at the tip of the pickup 1. It is. The method of switching ON / OFF of the lead-in switch 21 is not particularly limited, and various conventionally known methods can be adopted.

When the lead-in switch 21 is turned on,
Next, as shown in FIG. 3, the pickup 1 is moved by a predetermined number of pulses (8 pulses in FIG. 3), and the operation of the thread motor 4 is stopped at the position. For example, in FIG. 3, if one pulse = 38.9 μm,
In the pickup 1, the lead-in switch 21 is ON.
3 8 μm × 38.9 μm (see FIG. 3)
Stop at X ₃ ). Then, at that position,
0, and the address information at the time of arrival of the pickup 1 when the thread motor 4 is stopped is read.

The number of pulses that the pickup 1 moves after the lead-in switch 21 is turned on depends on the target address (in FIG. 3) in the TOC area (between X _{2 and} X _{5 in} FIG. 3). , X ₄ ) is set to a predetermined value in advance. For this reason, as the lead-in switch 21 is attached with higher precision, the pickup 1 is moved by a predetermined number of pulses from the position where the lead-in switch 21 is turned on to thereby set a predetermined target address (FIG. 3). In the middle, address information near X ₄ ) is read.

The predetermined target address is preferably set at the center position of the TOC area of the disk 30. By setting the predetermined target address at the center position of the TOC area in this manner, the pickup 1 can be moved to the center of the TOC area as a target and reliably stopped at that position. The TOC information can be reliably obtained by reading the TOC information once without stopping at the end position of the area and reading the TOC information.

The number of pulses that the pickup 1 moves is based on the pulses generated from the Hall elements 5a and 5b attached to the rotating plate (rotor) of the thread motor 4 according to the amount of movement of the pickup 1. Are counted from the sled pulse signal generated by the speed / movement distance calculation circuit 8.

In this case, the feed voltage of the sled motor 4 is lowered at the same time as the lead-in switch 21 is turned on, and the feed voltage is reduced to zero when the sled motor 4 moves the pickup 1 by a predetermined number of pulses. As a result, the thread motor 4
Under the control of the digital servo processing circuit 13 which also functions as a speed control means, based on the thread motor drive signal g (see FIG. 1) from the PWM driver 9 at a position moved by a predetermined number of pulses with high accuracy. Can be stopped.

In this case, at the same time as the lead-in switch 21 is turned on, the output of the sled motor 4 is synchronized with the pulses generated by the hall elements 5a and 5b, and the output of the sled motor 4 is determined for each pulse edge based on the specified value. Lower the feed voltage of the thread motor 4
However, when the pickup 1 is moved by the predetermined number of pulses, the feed rate is set to zero, so that it is not necessary to apply an abrupt brake to stop the pickup 1, so that power consumption can be reduced.

When the pickup 1 is moved and stopped in this way and the address information at the time of arrival is read, subsequently, the difference between the read address information and the predetermined target address is determined by the control The microcomputer 15 calculates the speed and distance of the movement of the pickup 1 in the direction of the center of the disk or in the opposite direction to the predetermined target address.

This address difference, that is, the difference between the address at the time of arrival and the predetermined target address is calculated as the mounting error of the lead-in switch 21. This address difference is converted into a pulse number by converting it into a thread feed pulse by the control microcomputer 15 and is converted into a first differential pulse number (first differential pulse number).
6 is written.

The first difference pulse number is obtained as follows. First, a value obtained by converting the address at the time of arrival (that is, an address read after counting a predetermined number of pulses) into the number of tracks from the reference position and a value obtained by converting the predetermined target address into the number of tracks from the reference position are used. The difference is calculated as a track book. In this case, this value is N
Assuming that the track pitch is P [μm] in [book], the distance that the pickup 1 must move is N × P [μm].
m], the distance the sled motor 4 moves the pickup 1 per rotation is L [μm / ro
t], the total number of rotations W at which the sled motor 4 must rotate is W = N × P / L [rotation].

The rotation speed is calculated based on the output signals a and b of the hall elements 5a and 5b, which are the output signals of the hall elements 5a and 5b.
(See FIG. 1). Assuming that there are Y sets of magnets provided on the rotating plate (rotor) opposed to the Hall elements 5a and 5b and having N and S poles as a set, for example, in the Hall element output signals a and b, the thread feed is performed 2Y times. When the pulse edge is detected, it means that the thread motor 4 has made one rotation.

Therefore, the number Z of thread pulse edges to be detected before the target track is achieved is as follows: Z = W × 2Y = N × P × 2Y / L

That is, based on the output signals of the Hall elements 5a and 5b, a thread pulse signal is created by the speed / movement distance calculation circuit 8, and the number of thread pulses is counted.
The point where the count number from the stop position of the thread motor 4 (X _{3 in} FIG. 3) becomes Z, that is, N × P × 2Y / L is a predetermined target address, and the calculated thread pulse number N × P × 2Y / L is written to the nonvolatile memory 16 by the control microcomputer 15 as the first differential pulse number.

[0087] Then, the control microcomputer 15, the first differential number of pulses (i.e., in FIG. 3, the number of pulses corresponding to the address difference between the address in the address and X ₃ in X _4), the lead-in switch The predetermined number of pulses counted since is turned on (ie, FIG. 3
, The number of pulses counted from the thread pulse signal obtained while the pickup 1 is moving between X _{1 and} X ₃ ) until the target address is reached after the lead-in switch is turned ON. The total number of pulses (hereinafter referred to as the number of movement pulses) required for the power supply is obtained, and the number of movement pulses is used from the next time the power is turned on again. The movement of the pickup 1 by the thread motor 4 is controlled so that the pickup 1 moves in the direction of the predetermined target address by the number of movement pulses.

Thus, when the power of the disk reproducing apparatus is turned on again, the disk reproducing apparatus causes the thread motor 4 to move the pickup 1 by the number of moving pulses after the lead-in switch is turned ON. It moves to the direction of the predetermined target address, in this case, to the lead-in area 33 on the inner peripheral side of the disk 30.

In this case, the pickup 1 is fed at a constant speed until the lead-in switch 21 is turned on in accordance with the thread feed profile shown in FIG. 3, for example. By lowering the feed voltage of the thread motor 4 according to the thread feed profile shown, the pickup 1 can be stopped accurately at a predetermined target address.

In this case, at the same time as the lead-in switch 21 is turned on, the output of the sled motor 4 is synchronized with the pulses generated by the hall elements 5a and 5b, and the output of the sled motor 4 is determined for each pulse edge based on the specified value. Lower the feed voltage of the thread motor 4
When the pickup 1 is sent by the number of movement pulses after the lead-in switch is turned on (13th pulse in FIG. 3), the feed speed is set to zero, so that the pickup 1 is moved at a predetermined target address. It is possible to stop the pickup 1 accurately, and it is not necessary to apply an abrupt brake to stop the pickup 1, so that power consumption can be reduced.

As described above, according to the disk reproducing apparatus, the first difference pulse number is set to the value of the read-in switch 2.
By adding / subtracting the predetermined number of pulses counted since 1 was turned on, it is possible to obtain an accurate number of moving pulses required from when the lead-in switch 21 is turned on to when the lead-in switch 21 reaches a predetermined target address. Therefore, it is possible to absorb the mounting error of the lead-in switch 21, the eccentric variation of the disk 30, the variation of the disk chucking, and the like. Therefore, when the disc reproducing apparatus is started up, the mounting position of the lead-in switch 21 is in a state equivalent to the corrected position, and the pickup 1 can be reliably moved to a predetermined target address in the TOC area. The information can be read out immediately, and the start-up time of the disc reproducing apparatus can be shortened.

Further, in the case of using a disc which erases recorded data when the temperature exceeds a predetermined temperature,
The TOC area is an area in which data is not erased, and it is necessary to always start up from the TOC area when starting up the disk or when restarting the disk reproducing apparatus when an abnormal state occurs. The playback device uses this T
It is possible to reliably move to the OC area in a short time. For this reason, even when a disc having a super-resolution layer is used, the TO data is maintained without erasing the recorded data.
The C information can be read immediately, and the start-up time of the disc reproducing apparatus can be reduced.

In addition, the disc reproducing apparatus obtains, as the number of pulses, the address difference between the address at the time of arrival after counting the predetermined number of pulses after the lead-in switch is turned on and the predetermined target address, and uses this as the number of pulses for the next power supply. By using it for the correction of the movement of the pickup 1 from the time of turning on, the mounting position of the lead-in switch 21 is in a state equivalent to the corrected state when the disk reproducing apparatus is started up, and the pickup 1 is securely moved to the TOC. Since the pickup 1 can be moved to the target address in the area, as described above, the pickup 1 can be accurately and reliably moved to the predetermined target address in the TOC area. For this reason, the mounting accuracy of the lead-in switch 21 at the time of assembling the disk reproducing device is hardly required. Therefore, the disc reproducing apparatus does not require precise adjustment of the mounting position of the lead-in switch 21 and can reduce the time required for the assembling work.

Before the disk reproducing apparatus is shipped, the lead-in switch 21 is controlled by a standard-standard disk, for example, the disk 30 before the disk reproducing apparatus is shipped.
The error of the mounting position of the lead-in switch 21 is apparently calculated by replacing the moving amount with the pulse as described above and storing it in the nonvolatile memory 16 as the first difference pulse number as described above. This means that the position has been corrected. Therefore, even when the mounting position of the lead-in switch 21 is not precisely adjusted, the lead-in switch 2 can be set at the time of shipment of the disc reproducing apparatus.
The disk reproducing device in which the mounting position of (1) is corrected can be shipped.

In this case, when a new disk 30 'is mounted on the disk reproducing apparatus and the disk reproducing apparatus is turned on when reproducing the disk 30', Under the control of the control microcomputer 15, the first difference pulse number held in the non-volatile memory 16 is read out, and based on the first difference pulse number, the first difference pulse number is turned on after the read-in switch 21 is turned on. The pickup 1 is moved by the sled motor 4 by the number of moving pulses obtained by adding the predetermined number of pulses to the number of differential pulses.
, The operation of the thread motor 4 is stopped, the pickup 1 reads the address information on the disk 30 'at this position, and the read address information and the target address in the preset TOC area are read. The difference from the information is calculated, the difference is converted into the number of pulses, and the second difference pulse number (second difference pulse number) is obtained. This second difference pulse number is held until the disk 30 'is taken out. Then, from the next power-on using the disk 30 ′, the movement of the disk 30 ′ is determined by using the first differential pulse number and the second differential pulse number as correction data. It is possible to reliably and optimally move the pickup 1 to the TOC area of the disc 30 'mounted on the reproducing apparatus. In this case, even when the newly mounted disk 30 'is a non-standard disk, the pickup 1 can be reliably moved to the TOC area.

The second difference pulse number can be obtained by the same method as the first difference pulse number.
The first differential pulse number is obtained by converting the address at the time of arrival (that is, the read address after the predetermined pulse number is counted) into the number of tracks from the reference position after counting the predetermined number of pulses after the lead-in switch 21 is turned on. The difference between the calculated value and the value obtained by converting the predetermined target address into the number of tracks from the reference position is calculated as the number of tracks, and the distance that the pickup 1 must move from the value and the track pitch is calculated. The second difference pulse number is calculated by calculating the number of thread pulse edges to be detected before reaching the target track.
A value obtained by counting the number of moving pulses (ie, a value obtained by adding / subtracting the first difference pulse number to / from the predetermined number of pulses) after the lead-in switch 21 is turned on, and then converting the read address to the number of tracks from the reference position. And the value obtained by converting the predetermined target address into the number of tracks from the reference position is calculated as the number of tracks, and the distance that the pickup 1 has to move is determined from this value and the track pitch. First, the number of thread pulse edges to be detected until the target track is reached can be calculated.

The second difference pulse number is recorded in the nonvolatile memory 16 together with the first difference pulse number. When the power is turned on again until the disk 30 'is removed,
Under the control of the control microcomputer 15, the data is read from the nonvolatile memory 16 together with the first difference pulse number. Thus, the pickup 1 is driven by the thread motor 4
The number of pulses obtained by adding and subtracting the first differential pulse number and the second differential pulse number to and from the predetermined pulse number after the lead-in switch is turned on, that is, the second differential pulse number is added to and subtracted from the moving pulse number. In the direction of the predetermined target address by the number of pulses obtained in this case, in this case, the disk 3
It moves to the lead-in area 33 on the inner peripheral side of the zero.

In this case, the pickup 1 is sent at a constant speed until the lead-in switch 21 is turned on in accordance with, for example, a thread feed profile shown in FIG. By lowering the output of the thread motor 4, that is, the feed voltage according to the thread feed profile shown in FIG. 3, the pickup 1 can be stopped accurately at a predetermined target address.

In this case, when the output of the thread motor 4 is lowered, as shown in FIG. 4, the output of the thread motor 4 is synchronized with the pulses generated by the Hall elements 5a and 5b, and one pulse edge is generated. Each time, the feed voltage of the sled motor 4 is reduced based on the designated value, and after the lead-in switch 21 is turned on, the first differential pulse number and the second differential pulse number are added to or subtracted from the predetermined pulse number. By setting the output of the thread motor 4 to zero when the number of pulses (added in the present embodiment) has been counted, the pickup 1 can be stopped accurately at a predetermined target address, and the pickup 1 can be stopped accurately.
Because it is not necessary to apply sudden braking to stop the vehicle, power consumption can be reduced.

As the feed control during reproduction of the disk 30 ', when the power is turned on again, the second differential pulse number and the first differential pulse number are read from the nonvolatile memory 16 under the control of the control microcomputer 15. Read, for example, FIG.
In accordance with the thread feed profile shown in FIG. 5, the pickup 1 has the number of pulses obtained by adding / subtracting (adding in the present embodiment) the first difference pulse number and the second difference pulse number after the lead-in switch 21 is turned on. The pickup 1 is fed at a constant speed in the same manner as the feed until the lead-in switch 21 is turned on, and the output of the sled motor 4, that is, the feed voltage is gradually reduced for a predetermined number of pulses. It is possible to accurately stop at a predetermined target address, and
The target address in the OC area can be reached earlier.

Also, in this case, when the output of the thread motor 4 is lowered, as shown in FIG. 5, the output of the thread motor 4 is synchronized with the pulses generated by the Hall elements 5a and 5b for one pulse. For each edge, lower the feed voltage of the thread motor 4 based on the specified value,
After the lead-in switch 21 is turned ON, a predetermined number of pulses is counted from the time when the pickup 1 is moved by the number of pulses obtained by adding and subtracting (adding in the present embodiment) the first difference pulse number and the second difference pulse number. By making the output of the thread motor 4 zero at the minute count, the brake is not required to be applied suddenly to stop the pickup 1 at a predetermined target address, so that power consumption can be reduced.

In the present embodiment, for example, the width of the TOC information area is 1.0 mm, the disc tolerance is within ± 10 μm, the maximum eccentricity of the disc is within ± 23 μm, and the disc 30 ′ is loose when the disc is mounted. Is set within ± 16 μm, the length of one TOC information cycle is set to 20 μm, the width of the TOC information area is A, the disk tolerance is B, the maximum eccentricity of the disk is C, and this occurs when the disk is mounted. Assuming that the rattling of the disk 30 '(dismounting of the disk) is D and the length of one TOC information is E, A / 2-E> B + C + D is guaranteed, and the pickup 1 is stopped near the center of the TOC area. If it is possible, the TOC information can be reliably read without retry, and the start-up time of the disk 30 'can be shortened. .

According to the above feed control, in addition to the variation in the mounting position of the lead-in switch 21, the disc 3
Since the eccentricity variation of 0 ′ and the variation of disk chucking can be absorbed, the pickup 1 can be accurately moved to a predetermined target address in the TOC area and the TOC information can be read, so that the disk 30 ′ can be started up. Time can be hastened.

When the power of the disc reproducing apparatus is turned off, when the power is turned on again, the position of the pickup 1 may be changed to the inner or outer circumference of the disc 30 'when the lead-in switch is turned on. It is possible that the user is outside the TOC area. In this case, in particular, when the pickup 1 is located in the inner peripheral mirror area 32 or the outer peripheral mirror area 36, there is a possibility that the startup of the disc reproducing apparatus may be hindered. In addition, in order to accurately move to the TOC area, the lead-in switch 21 must be turned on.
It is necessary to perform the movement using the time point when becomes the reference position.
Therefore, in such a case, once the pickup 1 is
It is necessary to move out of the lead-in area 33.

Therefore, in the disk reproducing apparatus according to the present embodiment, if the lead-in switch 21 is initially turned on by the control microcomputer 15 when the power of the disk reproducing apparatus is turned on again, the pickup 1 once the lead-in switch 21 is turned off
Out of the lead-in area 33 of the disk 30 until
In this case, the disk is sent to the outer peripheral side of the disk 30 for a certain period of time, and after confirming that the lead-in switch 21 has been turned off, the direction opposite to the moving direction, that is, the disk 3
The movement of the pickup 1 by the sled motor 4 is controlled so as to be sent to the inner peripheral side of 0 '.

As described above, when the power of the disc reproducing apparatus is turned on again, the lead-in switch 21 is set to O from the beginning.
If N, the pickup 1 is temporarily moved out of the lead-in area 33, and after confirming that the lead-in switch 21 is turned off, the pickup 1 is moved in the direction opposite to the moving direction. According to the method described above, TOC
The pickup 1 can be reliably and accurately moved to the area, and the disk reproducing apparatus can be started up optimally.

In the present embodiment, the TOC area, that is, the lead-in area 33 is provided on the inner peripheral side of the disk 30 '. When the switch 21 is ON from the beginning, the pickup 1 is
The disk is temporarily sent to the outer periphery of the disk 30 'for a certain period of time, and after confirming that the lead-in switch 21 is turned off, is sent to the inner periphery of the disk 30'.
When the area C is provided on the outer peripheral side of the disk, the reverse operation, that is, the pickup 1 is once sent to the inner peripheral side of the disk 30 'for a certain period of time, and the lead-in switch 21 is turned off. After confirming this, an operation of sending the disk 30 'to the outer peripheral side is performed.

That is, in the present embodiment, the TOC area is the inner circumference of the disks 30 and 30 ', specifically, the outer circumference of the inner mirror area 32 provided at the innermost circumference of the disks 30 and 30'. Although the main information area 34 is provided on the outer peripheral side of the lead-in area 33 provided on the side, the position of the TOC area is not limited to this. , Disk 30/3
A configuration may be provided on the outer peripheral side of 0 ′.

As described above, the disc reproducing apparatus according to the present embodiment has a TOC area in which TOC information is recorded on the inner or outer periphery, and a main data on the outer or inner periphery of the TOC area. In a disc reproducing apparatus for reproducing a disc having a main information area on which information is recorded, a pickup for reading information recorded on the disc, and a pickup provided near the TOC area of the disc, A lead-in switch that is turned on / off, a sled motor that moves the pickup in a radial direction of the disk, and a Hall element that generates pulses according to the amount of movement of the pickup; And a counter for counting the number of pulses generated by the Hall element. Speed / movement distance calculation circuit as control means, and control means for controlling the pickup moving means such that the pickup moves in the inner or outer peripheral direction of the disc when the disc is mounted on the disc reproducing apparatus. Control circuit (control microcomputer),
For example, the control means (control microcomputer) includes a control circuit provided with a control microcomputer, and the control means (control microcomputer) controls the read-in switch so as to reach a preset target address in the TOC area by moving the pickup. After a predetermined number of pulses have been counted since the signal was turned on, the operation of the thread motor is stopped, the address information on the disk at this position is read by the pickup, and the read address information and the preset TOC area are read. , And the difference is converted into the number of pulses, and the first difference pulse number obtained by the conversion is calculated as
The number of moving pulses required from when the lead-in switch is turned on to when the lead-in switch reaches the target address (predetermined target address) is calculated by adding or subtracting the predetermined number of pulses counted since the lead-in switch was turned on. The next time the power is turned on again, the number of moving pulses is used. When the power is turned on again, the pickup moves in the inner or outer circumference direction of the disk by the number of moving pulses after the lead-in switch is turned on. The thread motor is controlled so that

The disk reproducing apparatus has a nonvolatile memory, and can hold the first differential pulse number when the disk is of a standard standard.

When the lead-in switch is turned on from the beginning when the power of the disk reproducing apparatus is turned on again by the control means, the disk reproducing apparatus temporarily stops the pickup. Until the in-switch is turned off, the disk is sent in the inner or outer direction for a certain period of time. After confirming that the lead-in switch is turned off, the thread motor picks up the disk in the direction opposite to the moving direction. Movement is controlled.

According to the disk reproducing apparatus, the amount of movement of the pickup required until reaching the predetermined target address is corrected based on the position where the lead-in switch is turned on, and the predetermined amount within the TOC area is corrected. Can reliably and accurately move the pickup to the target address, as described above, it is possible to reduce both the time required for assembling the disk reproducing apparatus and the time required for starting up, In addition, there is no fear of erasing the recording data, and the TOC information can be read at one time.

When a new disk is mounted on the disk reproducing apparatus and the disk reproducing apparatus is turned on when reproducing the disk, the control means controls the nonvolatile memory. Is read out, and based on the first difference pulse number, the predetermined pulse number is added to the first difference pulse number after the lead-in switch is turned on. After the pickup is moved by the thread motor by the number of pulses, the operation of the thread motor is stopped, the pickup reads address information on the disk at this position, and the read address information and the preset address information are set. The difference from the target address information in the TOC area is calculated, and this difference is converted into the number of pulses to obtain the second address.
The second difference pulse number is held until the disk is taken out, and the movement of the disk is performed from the next power-on using the disk.
The control is performed using the first differential pulse number and the second differential pulse number.

In this case, the feed control of the pickup is as follows. When the power supply of the disk reproducing apparatus is turned on again, the thread motor causes the pickup to be counted by the first difference pulse number after the lead-in switch is turned on. During this time, the output of the pickup moving means is gradually lowered while counting by a predetermined number of pulses until the pickup reaches the target address, and the pickup stops accurately at the target address. Controlling the output of the thread motor as described above, or when the power of the disc reproducing apparatus is turned on again, the pickup is controlled by the thread motor,
After the lead-in switch is turned ON, the pulse is sent at a constant speed during counting for the number of pulses obtained by adding the second difference pulse number to the first difference pulse number, and thereafter, until the pickup reaches the target address. A method of controlling the output of the thread motor so that the output of the pickup moving means is gradually reduced while counting for a predetermined number of pulses so that the pickup accurately stops at the target address. In this case, when decreasing the output of the thread motor, the output of the thread motor is decreased in synchronization with the pulse generated by the Hall element as the pulse generating means, so that the pickup is stopped suddenly at the target address. Since it is not necessary to apply a heavy brake, power consumption can be reduced.

As described above, according to the disk reproducing apparatus, it is possible to reliably and optimally move the pickup to the TOC area of the disk mounted on the disk reproducing apparatus. The pickup can be accurately and quickly moved to the target address.

[0116]

As described above, the disc reproducing apparatus according to the present invention has a TOC area in which TOC information is recorded on the inner or outer periphery, and a main data on the outer or inner periphery of the TOC area. In a disc reproducing apparatus for reproducing a disc having a data area on which information is recorded, a pickup for reading information recorded on the disc, and a pickup provided near the TOC area of the disc and turned on by movement of the pickup. A lead-in switch to be turned off, a pickup moving means for moving the pickup in a radial direction of the disk, a pulse generating means for generating a pulse in accordance with a moving amount of the pickup, and a pulse generating means for generating the pulse. Counting means for counting the number of pulses; and a disk mounted on the disk reproducing apparatus. When it is, as the pickup is moved to the inner circumferential or outer circumferential direction of the disk,
Control means for controlling the pickup moving means, wherein the control means stops the operation of the pickup moving means after counting a predetermined number of pulses after the lead-in switch is turned on, and stops the operation of the pickup moving means. The address information on the disk at the position is read, and the read address information and a preset TO
The difference from the target address information in the C area is calculated, this difference is converted into a pulse number, and the first difference pulse number obtained by the conversion is counted after the lead-in switch is turned ON. The required number of pulses is calculated by adding or subtracting from the predetermined number of pulses to reach the target address after the lead-in switch is turned on. Sometimes, the pickup moving means is controlled so that the pickup moves in the inner or outer circumference of the disk by the number of pulses after the lead-in switch is turned on.

Therefore, the lead-in switch is turned on.
Since the exact number of pulses required until the target address is reached can be determined from the time, the mounting error of the lead-in switch, the eccentric variation of the disk, the variation of the disk chucking, and the like can be absorbed. . Therefore, when starting up the disc reproducing apparatus,
The mounting position of the lead-in switch is equivalent to the corrected position, and the pickup can be reliably moved to the target address in the TOC area, so that the TOC information can be immediately read out, and the start of the disk reproducing apparatus can be started. The raising time can be shortened.

In a disc in which recorded data is erased when the temperature exceeds a predetermined temperature, the TOC area is an area where data is not erased, and is re-started when the disc is started or when the disc reproducing apparatus becomes abnormal. When starting up, it is necessary to always start up from the TOC area. However, since the above-mentioned disc reproducing apparatus can surely move to this TOC area in a short time, a super-resolution layer is provided. Even in such a disc, the TOC information can be read immediately without erasing the recorded data, and the start-up time of the disc reproducing apparatus can be reduced.

Further, according to the above configuration, when the disk reproducing apparatus is started, the mounting position of the lead-in switch is in a state equivalent to the corrected state, and the pickup is reliably moved to the target address in the TOC area. Therefore, it is not necessary to precisely adjust the mounting position of the lead-in switch, and the time required for the assembling operation can be reduced.

Therefore, according to the above configuration, both the time required for assembling the disk reproducing apparatus and the time required for starting up the disk reproducing apparatus can be reduced, and there is no danger of erasing recorded data. In addition, one time TOC
There is an effect that a disk reproducing device capable of reading information can be provided.

Further, in the disk reproducing apparatus according to the present invention, as described above, when the power supply of the disk reproducing apparatus is turned on again, if the lead-in switch is turned on from the beginning, Once for a certain period of time in the inner or outer circumference direction of the disk until the lead-in switch is turned off, and after confirming that the lead-in switch is turned off, send the disk in the direction opposite to the moving direction. First, the pickup moving means is controlled.

Therefore, once the pickup is moved out of the lead-in area, it is confirmed that the lead-in switch is turned off, and then the pickup is sent in the direction opposite to the moving direction. There is an effect that the disk reproducing apparatus can be started up optimally.

The disk reproducing apparatus according to the present invention further comprises a nonvolatile memory as described above, and the nonvolatile memory is obtained by the control means when the disk is of a standard standard. The first difference pulse number is held.

Therefore, before shipping the disk reproducing apparatus, an error in the mounting position of the lead-in switch is calculated from the address information using a standard-standard disk, and
By replacing the movement amount with a pulse and retaining the amount in a non-volatile memory, the mounting position of the lead-in switch was apparently corrected. When the disc reproducing apparatus is shipped, the disc reproducing apparatus in which the mounting position of the lead-in switch has been corrected can be shipped.

Further, in the disk reproducing apparatus according to the present invention, as described above, the control means controls the power of the disk reproducing apparatus when a new disk is mounted on the disk reproducing apparatus and the disk is reproduced. Is entered,
The first difference pulse number stored in the non-volatile memory is read, and the predetermined pulse number is added to the first difference pulse number after the lead-in switch is turned ON based on the first difference pulse number. After the pickup is moved by the pickup moving means by the number of added pulses, the operation of the pickup moving means is stopped, and the address information on the disk at this position is read by the pickup, and the read address is read. The difference between the information and the target address information in the preset TOC area is calculated, and this difference is converted into the number of pulses to obtain a second number of differential pulses. The disk is held until it is taken out, and the movement of the disk from the next power-on using the disk is determined by the first differential pulse number and the 2 using the differential number of pulses is configured to control.

Therefore, by using the first and second differential pulse numbers as correction data, it is possible to reliably and optimally move the pickup to the TOC area of the disk mounted on the disk reproducing apparatus. This has the effect that it becomes possible. In particular, the pickup can be reliably moved to the TOC area even when reproducing a nonstandard disc or the like.

As described above, in the disk reproducing apparatus according to the present invention, when the power of the disk reproducing apparatus is turned on again, the control means turns on the pickup by the pickup moving means and turns on the lead-in switch. Until the target address is reached after the lead-in switch is turned on, gradually lowering the output of the pickup moving means so that the pickup stops accurately at the target address. This is a configuration for controlling the output of the moving means.

Therefore, there is an effect that the pickup can be accurately stopped at the target address in the TOC area.

As described above, in the disk reproducing apparatus according to the present invention, when the power of the disk reproducing apparatus is turned on again, the control means switches the pickup by the pickup moving means and turns on the lead-in switch. Then, the output of the pickup moving means is gradually decreased while counting the predetermined number of pulses until the pickup reaches the target address. The output of the pickup moving means is controlled so that the pickup stops accurately at the target address.

Therefore, there is an effect that the pickup can be stopped accurately and quickly at the target address in the TOC area.

As described above, in the disk reproducing apparatus according to the present invention, when the power of the disk reproducing apparatus is turned on again, the control means turns on the pickup by the pickup moving means and turns on the lead-in switch. From the first difference pulse number plus the second difference pulse number, the pulse is sent at a constant speed, and then the pickup is counted for a predetermined number of pulses until the pickup reaches the target address. The output of the pickup moving means is controlled so that the output of the pickup moving means is gradually decreased and the pickup is stopped accurately at the target address.

Therefore, there is an effect that the pickup can be stopped accurately and earlier at the target address in the TOC area.

As described above, in the disk reproducing apparatus according to the present invention, when the control means lowers the output of the pickup moving means, the control means changes the output of the pickup moving means to a pulse generated by the pulse generating means. It is a configuration that lowers in synchronization.

Therefore, it is not necessary to apply an abrupt brake to stop the pickup at the target address, so that it is possible to reduce power consumption.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a disk reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view showing the configuration of the disk shown in FIG.

FIG. 3 is an explanatory diagram showing a feed control of the disc reproducing apparatus of FIG. 1;

FIG. 4 is an explanatory diagram showing feed control of a newly mounted disc.

FIG. 5 is another explanatory diagram showing the feed control of a newly mounted disc.

FIG. 6 is an explanatory diagram showing ON / OFF control of a lead-in switch.

FIGS. 7A and 7B show ON of a lead-in switch;
FIG. 9 is another explanatory diagram showing the control of / OFF.

FIG. 8 is an explanatory diagram showing an operation of a pickup in a conventional disk reproducing device.

FIG. 9 is another explanatory diagram showing the operation of the pickup in the conventional disk reproducing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pickup 1a Light blocking member 2 Magnetic head 3 Spindle motor 4 Thread motor (pickup moving means) 5a Hall element (pulse generating means) 5b Hall element (pulse generating means) 8 Speed / moving distance calculation circuit (counting means) 11 Control circuit (Control means) 15 Control microcomputer (Control means) 16 Non-volatile memory 21 Lead-in switch 30 Disk 30 'Disk 33 Lead-in area (TOC area) 34 Main information area (Data area)

Claims (8)

[Claims] 1. A disc having a TOC area in which TOC information is recorded on an inner or outer periphery thereof and a data area in which main data information is recorded on an outer or inner periphery of the TOC area is reproduced. A pickup for reading information recorded on the disk, a lead-in switch provided in proximity to a TOC area of the disk, and turned on / off by movement of the pickup; Pickup moving means for moving the pickup in the radial direction, pulse generating means for generating a pulse in accordance with the amount of movement of the pickup, counting means for counting the number of pulses generated by the pulse generating means, When a disc is loaded,
Control means for controlling the pickup moving means so that the pickup moves in the inner or outer peripheral direction of the disk, wherein the control means counts a predetermined number of pulses after the lead-in switch is turned on. Thereafter, the operation of the pickup moving means is stopped, the address information on the disk at this position is read by the pickup, and a difference between the read address information and target address information in a preset TOC area is calculated. Then, the difference is converted into a pulse number, and the first difference pulse number obtained by the conversion is added to or subtracted from a predetermined pulse number counted after the lead-in switch is turned on, so that the lead-in switch is turned on. Calculate the number of pulses required until the target address is reached after the power is turned on. The number of pulses is used to control the pickup moving means so that the pickup moves in the inner or outer circumference of the disk by the number of pulses after the lead-in switch is turned on when the power is turned on again. A disk reproducing apparatus characterized by the above-mentioned. 2. The control means according to claim 1, wherein said lead-in switch is turned on from the beginning when said disk reproducing apparatus is turned on again, and said pickup is temporarily turned off until said lead-in switch is turned off. The pickup moving means is controlled to feed the disc in the inner or outer circumferential direction for a predetermined time, and after confirming that the lead-in switch is turned off, to feed the disc in a direction opposite to the moving direction. Item 3. The disk reproducing device according to Item 1. 3. The nonvolatile memory according to claim 1, wherein said nonvolatile memory holds the first differential pulse number obtained by said control means when said disk is of a standard standard. 3. The disc reproducing apparatus according to claim 1, wherein 4. The control means according to claim 1, wherein when a new disc is mounted on said disc reproducing apparatus and said disc reproducing apparatus is turned on when reproducing said disc, said control means is held in said nonvolatile memory. First
The number of pulses obtained by adding the predetermined number of pulses to the first number of differential pulses after the lead-in switch is turned on based on the first number of differential pulses. After the pickup is moved by the moving means, the operation of the pickup moving means is stopped, the address information on the disk at this position is read by the pickup, and the read address information and the preset TOC area in the TOC area are read. The difference from the target address information is calculated, the difference is converted to the number of pulses to obtain a second number of differential pulses, and the second number of differential pulses is held until the disk is taken out. The movement of the disk is controlled from the next power-on using the first differential pulse number and the second differential pulse number. Disk playback apparatus according to claim 3, wherein Rukoto. 5. The control means sends the pickup at a constant speed by the pickup moving means until the lead-in switch is turned on when the power of the disc reproducing apparatus is turned on again, and the lead-in switch is turned on. The output of the pick-up moving means is gradually reduced until the target address is reached, and the output of the pick-up moving means is controlled so that the pick-up stops accurately at the target address. The disk reproducing device according to claim 1. 6. The control device according to claim 1, wherein when the power of the disk reproducing apparatus is turned on again, the pickup moving unit counts the pickup by the first difference pulse number after the lead-in switch is turned on. Is sent at a constant speed, and thereafter, while counting for a predetermined number of pulses until the pickup reaches the target address, gradually lower the output of the pickup moving means so that the pickup stops accurately at the target address. 4. The disc reproducing apparatus according to claim 1, wherein an output of said pickup moving means is controlled. 7. The control means, when the power supply of the disk reproducing apparatus is turned on again, causes the pickup moving means to move the pickup to a first difference pulse number after the lead-in switch is turned on. Sending is performed at a constant speed while counting for the number of pulses including the number of differential pulses, and thereafter, while counting for a predetermined number of pulses until the pickup reaches the target address, the output of the pickup moving means is gradually reduced. 5. The disk reproducing apparatus according to claim 4, wherein an output of said pickup moving means is controlled so that the pickup stops accurately at a target address. 8. The apparatus according to claim 5, wherein said control means reduces the output of said pickup moving means in synchronization with a pulse generated by said pulse generating means when lowering the output of said pickup moving means. 8. The disc reproducing apparatus according to any one of claims 1 to 7.