JPS5938973A - Disk reproducer - Google Patents

Abstract

PURPOSE:To stabilize quickly a tracking state and to prevent the generation of mechanical noises, by varying the gain of tracking control in response to the degree of a track jumping action. CONSTITUTION:The information of a disk 1 is read by a reading means consisting of an optical head 6 and a photodetector 7. The head 6 includes both focus and tracking control functions and performs selectively a small track jumping action which moves quickly a comparatively short distance in the direction where the reading position crosses a record track and a large track jumping action which moves quickly a comparatively large distance in response to the control signal sent from a light beam control circuit 11. The tracking control gain is never increased with a small jumping action and then increased with a large jumping action.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention provides an information reading means for reading information 1 from a disc, such as a digital audio disc, on which a single word of information is recorded on a spiral recording track. In particular, it is possible to perform a so-called track jump I21 operation in which the information reading means rapidly moves the reading position on the disk in the direction of cutting 44q off the recording track. The present invention relates to an internal disc recording device.

BACKGROUND ART AND PROBLEMS Discs, such as optical digital audio discs, in which a single word of information is recorded on a spiral recording track at a constant recording density so that it can be read out optically by, for example, an array of pits. In the optical disk internal device used for No. 18 playback, the disk is moved 1-] with a predetermined rotational suction, t fc , the optical beam is completely incident on the disk, and information is generated. A optical head is provided for simple reading, and in normal playback (hereinafter referred to as normal beef), the reading position on the disc during rotation by this optical head is Tracking: 1jl-l fi+:11 is performed to ensure that the IF moves to accurately follow the track. Therefore, the optical head knows the reading position on the disk, that is, the position on the disk where the light beam reaches. , a tracking control means constituting a tracking servo mechanism for controlling the light beam so that it is properly combed over the recording track is provided 7, and a tracking control means is provided that constitutes a tracking servo mechanism to control the light beam so that it is combed properly over the recording track. This tracking control means is operated 11J7 in response to a tracking error, which is obtained in response to a tracking error, and thereby changes the state of the optical head, for example, the objective lens. The position of the light beam on the disk can be changed by 1° so that it properly follows the recording track. In addition, in such an optical disc reproducing device, not only the normal reciprocal state but also the read position on the disc by the optical head V, the recording track is read at a faster speed than during normal playback. A so-called rapid-feeding state in which the object is moved in the transverse direction, in which rapid-feeding is interrupted, is taken. For example, the reading position 9 of the information tower number ``disc by an optical head in the case of excavation'' from a specific position on the recording track of the disk is read from the center of the disk in the direction across the recording track. In the direction surrounding the outer periphery,
Or, in the opposite direction, it is moved at a faster speed than during normal playback, in other words, it is in a fast-forward state and is moved to the desired position1. This is achieved by suitably repeating a so-called track jump operation in which the position is rapidly moved in a direction across the recording track from one recording track to another recording track separated by a predetermined interval.

In this case, in order to move the position of the protrusion by the optical head to a desired position on the disk more quickly and accurately, for example, the optical head is provided with a reading voltage of 11V.
:Irregular movements such as ``jumping'' from a recording track consisting of ``4'' to the adjacent recording track/track jumping operation (
ψtrack jump 1 word, 10 track jumps with a reading position of 70 recording tracks/bu II+I
+ A medium-sized track jump operation like the one in the work, also selectively performs a large-scale track jump operation of [-Rike, a 100 track jump operation that jumps all 700 recorded tracks from the readout position 01''<. It is being done to

In addition, the optical disc playback device e as shown in the above 1bo (in addition, the reading position by the optical head takes the bold operating state where the colored part follows the same NIL recording trunk in a circular pattern over and over again). It is also done like this.

That is, for example, when starting beef cutting from a desired position on the disk, all reading positions by the optical head are held at the desired positions until the start. This state is also realized by repeatedly performing the above-mentioned track jump operation. That is, the reading position of an optical head that follows a recording track on a disk that is rotated at a predetermined rotational speed performs a track jump and returns to the original recording track every seven revolutions of the disk, for example. The hold operation state can be achieved by repeatedly performing the track jump operation.1 As mentioned above, the track jump operation is This is the behavior that Such a track jump operation is, for example, a tracking/jumping operation.
The tracking servo mechanism that performs tracking control is canceled in response to an error signal, and during this cancellation period, a predetermined track jump word is activated to perform tracking control.
The tracking control means constituting the servo mechanism is driven once, thereby rapidly changing the state of the optical head, for example, the objective lens, to determine the position at which the light beam reaches the disk, that is, '?' 6r, LIM position 1ic+°
This is done in such a way that it moves quickly across the track. Then, when the track jump is completed, the tracking servo mechanism returns to the operating state of 1-2 degrees Celsius, and the trunking error I occurs.
Based on g++, <tracking device side 1 is performed.

By the way, the period during which the track jump operation is performed [ke,
Since the tracking servo mechanism is released, there is a problem that immediately after the rack jump operation ends, the tracking state becomes a state in which the tracking deviation, that is, the tracking error is more severe than normal. The larger the scale of the track jump operation, in other words, the longer the tracking servo mechanism has been released, the more the tracking error will increase.
I'll get older when I get older. Therefore, in order to make the tracking system 0Illl by the tracking servo mechanism stable, it is necessary to correct such a dog tracking error as soon as possible. Therefore, in order to quickly stabilize the tracking control using the tracking servo mechanism, the control 1111 gain in the tracking control immediately after the completion of one track jump is set higher than normal. In response to this, the aim is to make the operation of the re-tracking servo machine l1fi agile and to quickly correct the large tracking error.

However, when the control gain is fully increased in the tracking control by the tracking servo mechanism, the operation of the tracking control means becomes active and mechanical noise is generated1.On the other hand, /θ track jump operation and 700 track A relatively large-scale trunk jump movement such as a jump movement is normally performed one-shot. ,
If flilIi7III gain in tracking control is desired, 10 track jump operation or 1
When a relatively large-scale track jump operation such as a 0θi rack jump operation is performed, the control gain in tracking control may be affected immediately afterward, even if temporary mechanical noise occurs. The early stabilization of the tracking state due to the increase in This creates the inconvenience that mechanical noise is generated during each operation, resulting in significant noise disturbances.Also, immediately after the completion of a small-scale truck operation such as a trunk jump operation, is usually a tracking
The error is large, so there is no way to increase the collateral gain in tracking control.

Purpose of the Invention (υ) In view of the above, the present invention provides a method for quickly stabilizing the tracking state immediately after the completion of a relatively large-scale trunk jump operation. In addition, if a relatively small-scale trunk jump operation is performed, a complete tisf regeneration device is provided immediately after the end of the trunk jump operation (to avoid mechanical noise generation). It is something.

Summary of the invention The Tisfu endogenous device ij+' according to the present invention has 11 elephants hh
- Autumn's 11S of information reading and reading by reading means to read all the details of the story from a disc with JC recorded tracks! The recording track can now be properly tracked.
l = racking control and the above-mentioned read position is recorded; , it is possible to selectively perform a large-scale track jump operation that moves quickly over a longer distance than the relatively short distance described above, and when a small-scale L-rack jump operation is performed, the VC C. The open side 1 gain in tracking control is not increased, and on the other hand, when a large-scale track jump operation is performed, the control gain in tracking control 1j is increased for the required time immediately after the completion of the large-scale track jump operation. is made to be enhanced. By being configured in this way, when a relatively large-scale track jump Mlh is performed, immediately after the completion of the track jump Mlh, the state of the truck blowfish 1, which is controlled by the l, rasokinobu, and servo mechanism V, can be improved. V suddenly becomes stable, and the generation of mechanical noise is avoided immediately after the completion of a relatively small-scale track control operation.

Embodiment 1 Hereinafter, an embodiment of a disc playback device according to the present invention will be described. 1. FIG. 1 shows a main part of an example of a disc playback device according to the present invention. For example, in a disk such as a digital audio disk, digital signals representing program information and address information are recorded at a constant recording density and have a whole spiral recording track. The disk mounting part 2 is mounted on a rotation drive means for rotating the disk, for example, a rotation hill of a disk rotation motor 3 ((1) and a disk rotation motor 3). 3 is driven by a motor control circuit Il to rotate the disk/coat at a constant linear speed; 1; k is an information reading means for making, for example, a laser beam incident on the disk/; A focus control means configured to receive the reflected laser beam modulated in accordance with the recorded digital signal, and a focus control means configured to receive the reflected laser beam that has been modulated in accordance with the recorded digital signal, and a position where the laser beam reaches the disk/on the disk, that is, a reading position.
A optical head B is provided with a tracking control means that forms a light beam that moves in a direction across the recording track, and a driving means, and the reflected laser light from the optical head B is detected and reproduced as a digital signal and a tracking error signal. and a light receiving section 7 that generates focus error No. 18. The reproduced digital signal from the light receiving section 7 is 1
The signal σ is supplied to the signal processing circuit section g, and the necessary processing is performed, and reproduction information output is obtained at the output terminal 9 of the signal processing circuit section.
Focus control i11 circuit 1 from the second output end of the light receiving section 7
A signal 11 is obtained at the output end of the focus control circuit 10, and is supplied to the focus control means provided in the optical head B to control the focus according to this focus error signal. 1 chuan xun 1) will be held.

On the other hand, the tracking error signal from the light receiving section 7 is transmitted from the third output end of the receiving Y: section 7 to the light beam control 1[]1.
ir'f) / / i',, Kfj i rel.

Konohikahi A control X1 times 11fr//Vrcu, command signal Sn1 to instruct all normal playback operation states from operation command unit/2, command signal Sa to instruct the cycle of track jump operation, small-scale track janobu operation/ Command signal S/ for instructing a truck jump operation, command signal No. 18 S10 for instructing all 10 truck jump operations, which is a medium-scale truck jump operation, and command signal 5, for instructing 100 truck jump operations, which is a large-scale truck jump operation.
10o, Track jump operation in the forward direction (for example, from the upper middle part of the disk to the outer circumference) (!? Command 1 symbol Sf that instructs) and in the opposite direction (for example, from the outer circumference to the center of the disk) A command word Sr instructing the operation of the track jack knob in the forward direction) is supplied as appropriate 1, and the light beam control circuit // outputs a command word Sr to the optical head B according to the supplied command r=. Make normal [f student [1lIJ 咋ya Trackja 7) motions. These commands (1 house number are not shown) are generated when one word obtained by selectively operating the operation keys provided on the 1°/h operation panel is supplied to the operation command unit/2. 1, then the above-mentioned beam control times i] each /
Each track jump operation performed in response to each command signal will be explained with reference to an example in 1. Note that in each case, an example of a forward fast feed operation will be taken as an example.

FIG. 2 shows an example of a light beam side-turning circuit that forms a part of an example of a disc playback device according to the present invention. In this example, the terminal 20 is a terminal ☆a11 to which the tracking error signal St from the light receiving section 7 is supplied, and the terminal 2
/,,2:),,,23. ．． 2'l, Ωk.

2A and 27 are operation commands f to lS/, command signals Sn, Sa, Sl, S10, 510O9Sf from 2, respectively.
and S, are the terminals to which 1, such former beam control side 1 time 1 bribe// are used to perform the /track jump operation, the operation command unit/,
Output curve of 2, from 74 to light beam control 1 circuit // end -
Command signals Sa, S/ and Sf are supplied to T, 2.2, 2.3 and 2B, respectively. Among these, Directive 1, M
S8 is supplied to the trunk jump cycle designation circuit-g, and this track jump cycle designation circuit 2g is supplied with l.
It is assumed that the entire period of the rank jump operation is specified by one command word Sa, and the pulse Pa has a period Tlr according to the command signal Sa, as shown in 71e in FIG. 3A.
occurs. This pulse Pa1l″l:, switch 29
is supplied to one contact of the

The switch 29 has a terminal at its control end, and a command 1 from 23.
The lucky number S/ is supplied and turned on, and as a result, the pulse Pa is passed through the switch 29 and supplied to the /track jump designation circuit 30. Further, this /track jump designation circuit 30 is supplied with a command No. 18 Sf from the terminal λB which instructs the track jump operation in the four directions of l1ll'. Then, a pulse P as shown in FIG.
A driving pulse P+]/ having a leading edge coincident with the leading edge of / and having a predetermined width Txt suitable for a track jump operation is obtained, for example, with positive polarity, and 17j, λ outputs IY1
On the other hand, a driving pulse P as shown in FIG.
I) has a leading edge coincident with the trailing edge of / and has a predetermined width T3 suitable for track jump operation? I have L! Fill motion pulse PB/ is obtained with negative polarity, 1/Track jump designation II] Drive pulse P o t from 1 path 30 and III ml pulse PB1 u,
The signal is fully supplied to the first pulse generating circuit 3/, and is also supplied to the track jump operation pulse generating circuit 32 via OR gates 3.2a and 32bf. This allows the first
The pulse generating circuit 3/ generates a leading edge that coincides with the leading edge of the driving pulse PI)/, as shown in the third diagram, and a control pulse t.
width T with a trailing edge that coincides with the trailing edge of lJ pulse PBt
The pulses p and io of u (=T2+T3) are generated, and from the track jump operation pulse generation circuit 32,
As shown in FIG. 3E, a total of 1111' pulses PJ for track jump operation, where the driving pulse PD/ and the braking pulse PR/ are combined, has a period T/l.
On the other hand, the pulse P10 of the first pulse generating circuit 3/ is supplied to the control end of the switch 330 via the OR gate 3, and is supplied to the switching contact C of the switch 33. As shown by the solid line, the movable contact a is connected to the two switching points C only during a period of width Tll of pulse 1]10, and is connected to the switching contact 1) during the other periods. Therefore, 1j of switch 33 $7)) J
'ip point a 11 has /track jump' operation pulse PJ and terminal, tracking error from 20 -1
The iris signal St is obtained by the transformer and is supplied to the variable gain amplifier 3. This variable gain amplifier receives 33trl/track jump operation pulses P and rk, and 4r1,
The control signal for trunk jump operation is supplied to the tracking control means provided in the optical system/track jump operation pulse PJ drive pulse PD/
According to the tracking control means oaf: driven, and
Tracking ttfl I according to braking pulse PB/
'Apply the brakes to the M1 means 4a and perform the entire trunk jump operation. Further, when the tracking error signal St is supplied to the variable gain amplifier 3S, the normal reproduction operation state is entered and tracking control is performed by the tracking servo mechanism.

Next, when /θ track jump operation is performed,
The output end of the operation command unit //2 is connected to the terminal 22 of the light beam control circuit //. 211 and 2B, command signals Sa and S
/θ and Sf are respectively supplied 1, the command Sa is supplied to the track jump cycle designation circuit 2g, and in this track jump cycle designation time 1, a pulse Pa is obtained and one of the switches 3B is supplied to the contacts. This switch 3B receives command 1r from terminal 2'l at its control end.
'i+jS/0 is supplied and turned on, and as a result, a pulse Pa as shown in FIG.
7.

Further, this 70 track jump designation circuit 37 is supplied with a command signal Sf from the terminal λB, 1 and 10
As shown in FIG. As shown in FIG. 11] I motion pulse PB,
2 is obtained.

10 Drive Hals P from track jump designation circuit 37
Dco & D fl+lI dynamic pulse P B , 21rJ
-, supplied to the second = second pulse generation port b'h 3 g,
The signal is supplied to the track jump operation pulse generating circuit 32 through OR gates 32a and 32b'c. As a result, as shown in the third diagram, the second pulse generating circuit outputs a width T'() which is longer than the above-mentioned pulse P10.
A pulse P10' having Tλ'+T, r/) is obtained, and the pulse generating circuit 3 for operating the track knob is obtained.
From 2 onwards, as shown in diagram E, the drive pulse PD, 2
and braking pulse PR,! Let Tg' be the combined total width of /θ Track jump operation pulse PJ' is generated at a predetermined period and is supplied to the switching contact C of the switch 33. On the other hand, the second pulse generating circuit The 3g pulse P10' is
Control f11 of switch 33 via or gate 3'l'c
The movable contact a of the switch 33 is connected to the switching contact cV only during the period of the width Tq/ of the pulse P10', and is connected to the switching contact cV during the other periods.

Mata, pulse PI□' (tl, or gate,??-
The gain control circuit 10 is supplied to the gain control circuit 10 through the 1000, which has a front line that coincides with the trailing edge of each pulse P10' and has a predetermined width, as shown in FIG. T
The left side of the variable gain amplifier 3 generates a gain control signal PG having xt and supplies it to the control end of the variable gain amplifier 3S. During the period of the width T of Pc, the signal is amplified with a predetermined gain that is better than the normal gain.7During this period, the normal playback operation state is maintained, so the tracking error signal Tracking control is performed with a higher control gain than the normal control gain in St7.
Furthermore, when a 100 track jump operation is performed, the output terminal of the operation command section/2 is connected to the original beam control circuit/
Command signal Sa, 510 is sent to terminals 22, 2 and λ of /.
o and Sf can be supplied respectively. Command signal S aU l-
When the track jump cycle designation circuit 2g is fully supplied to the rank jump cycle designation circuit 2g, the pulse Pa
is obtained and supplied to one contact of the Swissog/. Is this switching/that? The command signal 510o from the terminal 2 is no longer supplied to the control terminal 17 and is turned on, so that the pulse Pa is supplied to the 100 track jump designation circuit λ through the switch switch. Further, the command signal Sf from the terminal 2B can be supplied to the /θ0 track jump designation circuits 4 and 2. Then, the above-mentioned drive pulse PI) is applied to one output terminal of the 10θ track jump designation circuit λ.
The driving pulse Po, y, which is even wider than 2, is interrupted,
The other output terminal receives the above-mentioned C control pulses I)B, 2. 3, in which a braking pulse PBJ with a more roughly dog-like width is obtained, and the driving pulse PD3 and the starvation pulse PBJ are
1 fc, or
When supplied to track jump operation pulse generation 11J path 3.2 through gates 3.2a and 3.2bf, the third
The pulse generator circuit 3 generates a pulse PIO, and the track jump operation pulse generator circuit 32 generates a pulse PIO.
00 track jump operation pulse PJ" is obtained.

The subsequent operation is similar to that of the 70 track jump operation described above. Note that in this example, 100
Gain control IS number Pc1d obtained immediately after the track jump operation ends, /θ Track jump operation end IG
The width of the gain sub-side 1 signal PcO obtained later is σ from the width T of the gain sub-side 1 signal. Therefore, tracking? The time during which the open side 1 gain in Ii control is increased more than usual is longer than when the 10-track jump operation is performed.

1. The above description is for the forward track control operation, but when the reverse track control operation is performed, the command signal Sf is replaced by the command signal Sf that is supplied to the terminal 2B. , the command S is supplied to the terminal 27. Further, when the command signal Sn is supplied to the terminal 2/, the movable contact a of the switch 33 is connected to the switching contact 3 as shown by the dotted line in FIG. As a result, the tracking error f word St from the terminal 20 is supplied to the variable gain amplifier 3k through the switch 33, and the tracking control word from the left side of the variable gain amplifier 3 is sent to the tracking control means B. is supplied to the tracking servo mechanism to track the nova! It can be said that the normal playback state is reached in which tflll m11 has the normal control gain of Jj1. .

As described in ``Effects of the Invention'', the disk internal generation device according to the present invention allows the trunking servo mechanism to be activated immediately after a relatively large track jump operation is performed. The ttjll r+141 gain in the tracking control 11i11' is increased higher than normal for a predetermined period of time, and on the other hand, when a relatively small track jump operation such as /track jump operation is performed, the tracking control is Since the control gain is not changed in this case, it is possible to quickly stabilize the tracking state after a track jump operation on a comparable scale, and also to A track jump operation of a small scale was carried out.ll'
−j after C(, can prevent mechanical noise from occurring, which allows, for example, a hold operation state without noise disturbances3,

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a main part of an example of a disk internal generation device i<j according to the VC of the present invention, and FIG. 2 is a specific configuration of a light beam control circuit forming a part of the example shown in FIG. FIGS. 3 and 3 are waveform diagrams for explaining the circuit shown in the Ω diagram. In the figure, / is the disk, 5fl information reading means, O is the optical head, // is the original beam control 1rjl path, /, 2 is the operation command section, 30 is / the track juffing designation circuit, 3/ is the first 32 is a pulse generation circuit for track jump operation; 32a, 3.2b, 3lI and 39 are orer gates; 33 is a variable gain amplifier; 37 is a 10 track jump finger circuit; 3g is a second pulse generation circuit, G0 is gain control 1U1 path, G2 is 100
Track jump designation M path, /13 is the third pulse generation time (烙). Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] Information Me, jIV for reading the information signal from a disk having a spiral recording track on which the information signal is recorded.
Reading of the above disk by means of 9th to 11°
However, j-', tracking control that allows the recording track to be followed appropriately, and the above-mentioned reading position.
A relatively short ll′l in the direction across the second recording track.
jOutdoor warehouse, small-scale truck jar that can be moved rapidly/
ψ11 strokes, and the reading position crosses the recording track by a distance fjf(t
'E, it is possible to perform a large-scale truck jafugu movement that is forced to move rapidly, and if the above-mentioned irregular (Ki Trunk Djanzo movement) is performed, the control gain in the total 1 tracking control is increased. The control gain on the -4 secondary trunking system side 1 is increased for a predetermined period of time immediately after the large-scale track jump operation is performed without being affected by the large-scale track jump operation. Disc playback devices, which shall be exempted.