JPS5952471A - Disc record reproducer - Google Patents

Abstract

PURPOSE:To attain quick and accurate search, by producing a kick pulse to shift a pickup by a distance, when the distance between the present position of the pickup and the objective position exists within a prescribed range for a DAD device. CONSTITUTION:An absolute address of the present position is read out from a memory 153 and an absolute address of the objective position is outputted from an adder 157 and position calculating circuits 158, 159 calculate distance information. The absolute value of the difference is outputted from a subtraction circuit 160 to be a distance data between the present position and the objective position of the pickup 142. This data is set to a shift amount calculating counter 161 as an initial data and applied to a kick pulse generating circuit 162. A subtraction circuit 163 inputs the said absolute address and outputs the time difference between the present position and the objective position of the pickup. The subtraction circuit 163 supplies the polarity signal in response to the result of subtraction to the circuits 166 and 167. The circuit 162 produces a kick pulse shifting the pickup by a distance corresponding to the distance data from the subtraction circuit 160.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This invention relates to a CD (optical compact disc), for example.
The present invention relates to a disc record playback device suitable for a digital audio disc (DAC), and particularly to a search system for quickly selecting (identifying) desired data.

[Technical background of the invention and its problems] Recently, in the field of audio equipment, in order to reproduce sieve fidelity as much as possible, digital technology using PCM (/4' code modulation) technology has been developed. Recording and reproducing methods are being adopted. In other words, this is what is called digital audio, and the audio characteristics do not depend on the characteristics of the recording medium and are much superior to those using conventional analog recording and playback methods. This is because it is established in principle.

In this case, a system that uses a disk as a recording medium is called a DAD system, and optical, electrostatic, and mechanical recording and reproducing methods have been proposed. Even if such a method is adopted, the writer/writer device that embodies the method is still required to be able to satisfy various advanced control functions and performance not found in conventional devices.

In other words, if we take the CD system as an example,
A transparent resin disk with a diameter of 12 [Ken] and a thickness of 1.2 [Diameter] is coated with a metal thin film that forms bits (irregularities with different reflectances) corresponding to digitized (PCM) data. Approximately 500 to 2 by CLV (constant linear velocity) method
00 (r, p, m) and is driven to rotate at a variable rotational speed of 0.00 (r, p, m), and reproduced in a linear tracking manner from the inner circumferential side to the outer circumferential side using an optical pickup containing a semiconductor laser and a photoelectric conversion element. However, the track pitch of this disk is 1.6 [μm], and even one side has a track pitch of about 1.6 [μm].
A huge amount of information that can perform stereo reproduction of time is recorded in the program area (radius 25 to 8 (11113)), and the index data etc. are stored in the lead area (radius 23 to 25 [πm]). It is easy to know the VC rules from the fact that it is recorded.

However, in this disc record playback device, which has been known since then, the desired data (music) is selected (-In) from among the plurality of data (music) recorded in the program area. It is included that the so-called search function, which cannot be implemented immediately, is an issue that needs to be resolved immediately (because something that can be done quickly has not yet been realized).

[Purpose of the invention]

This invention has been made based on the above circumstances, and is particularly useful in disc record playback devices that play back discs containing digitized data. It is an object of the present invention to provide an extremely good disc record 6 generation device U that can perform the following operations.

[Summary of the invention]

That is, the present invention provides a disk replacement method in which digital data and temporal information, which are obtained by converting information signals into PGMs, are recorded from a disk through an optical pickup, and the digital data and temporal information are read out from the disk. In the production equipment, a setting means for setting a temporal information of a target position to which the pickup is to be moved, and a comparison between the temporal information set in the setting means and the temporal information read from the pickup. A determining means for determining whether the distance between the current position II' of the pickup and the destination position fR indicated by Ti1J is greater than or equal to a predetermined distance, and the determining means determines the current position 111' of the pickup and each time based on the time information set in the setting means and the time information read out from the pickup in a state where it is determined that the distance between the inner eye position 1N is equal to or higher than the predetermined pressure Pjff. a calculating means for calculating each piece of radius information of the disk corresponding to the temporal information; , and the target position, a subtraction means for generating a drive (g) for moving the pickup in the direction of the target position, and a distance by which the pickup is moved in the radial direction of the disk by the subtraction means. movement number detection means for generating movement amount detection data corresponding to the movement amount detection means; and movement of the pickup in a state in which the movement amount detection data inputted from the movement number detection means corresponds to the detachment data calculated by the subtraction means. and moving the big ara f by the distance in a state where it is determined by the determining means that the distance between the current position of the front pickup and the target position is within the predetermined distance. This device is characterized by comprising a kick pulse generating means for generating a kick pulse to cause the pickup to move quickly and reliably to the target position.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. First, the D of the CD system to which this invention is applied.
An outline of the AD playback device will be explained below.

That is, FIG. 1 shows a front external view, and in the figure II
I is a kangaru-pocket type disc loading section provided on the front surface of the cabinet 110 so as to be openable and closable. On the left side of this disk loading section ``4 part III'' is an eject key 112 for opening and closing the disk loading section.
And power key 11 for connecting/disconnecting power source (POV17ER)
3 has been installed.

Further, on the upper right side of the disk loading section 111, there is a display section 114 for making various displays, a reverse (REV) key 115 for so-called backward operation, and a fast forward (FF) key for fast forward operation.
Key 116 PLAY for operation
) keys 117 are provided. Similarly, in the middle row are the next play (NET PLAY) key 118, the repeat (REPEAT) Φ-119, and the pause (P
An AUSE ) key 120 and a stop (5TOP) key 121 are provided. Similarly, in the lower row, 0, 1
．． 2゜..., 9 number keys 122 to 13, memory read (M READ ) key 132 and memory (M
FMORY) key 133 and a clear (C1, 1/1) key 134 are provided.

Then, the above-mentioned display section 114 displays
I; CT ) Display 114IL, Narch (5 EAR (I
t) Display 114br error (ERROIt) display 114C, repeat (REPEAT) display 114d.

MANUAL display 114e, AUTO display 114f, memo 1 MEM
ORY) Display 114g and 8 channel memory indicator (MFMORY INDICATOR) Z
14 h and song number (MUSIC No.) display 1141
and a time (TIME) indicator 114j.

In addition, play (PL, AY) Kino 17 and pose (
Also during the PAUSE) key 120, the PLAY (PL) key is pressed.
AY) indicator 114k and a pause (PAUSE) indicator 114t are provided.

Here, FIG. 2 shows the electric circuit system of the CD type DAD reproducing apparatus shown in FIG. 1.

That is, the disk 140 (r'J in FIG. 2) is loaded in the disk loading section III, and is connected to the disk motor 141 so that its rotational force is transmitted when the disk loading section III is closed. Further, a pickup 142 is provided so as to face the signal recording surface of the disk 140. This pickup 142 is supported so as to be movable in the radial direction of the disk 140, and is driven by a pickup feed motor 143. The pickup 142 is actually provided on the side of the disk motor 141 where the focus is placed (that is, at the bottom 1t11.l of the disk 140 in FIG. 2). Although it is a 2'■2 figure, it is disk 14 for convenience.
I will draw 1l (llVc) above 0.

The pickup 142-1, although not shown, includes a laser emitting unit, a pose, a streak, a converging lens, and a light N.
First, a laser beam emitted from a laser emitting section is converged by a converging lens via a beam splitter, and focused (spot degree) on the surface of the disk 140. Then, the laser beam is reflected depending on the presence or absence of pits on the disk 140, travels backward through the converging lens, and is guided by the beam splitter to the photoelectric conversion element.

Therefore, the photoelectric conversion element outputs an electrical code (hereinafter referred to as an RF multiplied signal) corresponding to the presence or absence of the above-mentioned biy) and its temporal length, and the digitized data recorded on the disk 140 is read out here. It is something that can be done.

By the way, in the program area (radius 25 to s'8 [mt)] of the disk 140, along with a plurality of audio data (hereinafter described as an interval), each day's song number (T
NO) 'Iz r-ta, data that divides the same song into multiple parts and shows each divided area (hereinafter referred to as index data).

The elapsed time from the start to the end of each song (hereinafter referred to as relative address) - data indicating t and the continuous elapsed time from the start of the performance of the first song to the end of the last song (hereinafter referred to as absolute address) Address data such as data indicating the address is recorded. 1, that is, the above RF signal tJ1,
It contains audio data and address data, and in this case, both data are output in parallel '1tjl'P.

In addition, in the lead-in area (radius 23 to 25 (v, m, ) of 14θ of ``2nd note'', there are songs of multiple songs arranged in the grogram area = 11♀ (TNO), each day. Data indicating relative addresses and absolute addresses at the start of each day's performance (Table Meb Contents (TO
C) data) is recorded 112 times.

Here, the DAD playback device normally penetrates the pickup 142 by an inner island HtB of the disc 140, specifically, 4" of the lead-in area of the disc 140.
The position fi1 is set at 1:6 minutes corresponding to 9'-1 to the starting position of 4th grade. In addition, the fi 亥DAD playback device detects that the disc 140 has been loaded into the front ill; ) key 113
is operated, the disk motor I4I is rotated, the contents of the lead-in area are automatically read by the pickup 142, stored in the read-in data memory (to be described later), and the pickup 01 is
42 is positioned at a portion of the program area of the disk 140 corresponding to the playback start position and is controlled to be in a standby state. Then, in this standby state, for example, the play (
When the PLAY, ) key 117 is operated, the contents of the program area are read out.

Here, the RF information output from the pickup 142 is supplied to a focus control circuit 144, a tracking control circuit 145, and a process circuit 146, respectively. Of these, the focus control circuit 144
By generating a focus error signal from the pickup 14 and feeding it back to the pickup 142, the converging lens in the pickup 142 is moved to the disk so that the light beam is accurately focused on the surface of the disk 140. Control is performed in the plane direction of 140 to perform so-called focus servo. Further, the tracking control circuit 145 generates a tracking error signal from the RF (jt number bone). It has negative and positive polarity levels due to the deviation in the circumferential and outer circumferential directions, and the absolute value level changes depending on the size of the deviation. When the spot is located at the center of the track, the O
This is L/Bell. Then, the tracking control circuit 145 feeds the tracking error No. 4Fi to the pickup 142 via a switch circuit 147 and an adder circuit 148, which will be described later. By doing so, the converging lens in the pickup 142 is controlled in the radial direction of the disk 140 so that the spot of the light beam on the disk 140 is accurately positioned at the center of the track, thereby performing a so-called tracking serve. be.

Mafi-1 The tracking error signal output from the tracking control circuit 145 is transmitted to the switch circuit 14.
After passing through the feed motor control circuit 149 and the IIJ exchange circuit 150 (to be described later), the front 612 pick-up feed motor r43bt Usuhei i...) is applied, and for example, as the Niu-shi 1 work progresses, the -C pickup 142 is moved from the inner circumference to the outer circumference of the disk 140.

Furthermore, the norocess circuit 146 has the upper 1LiRF18
After performing time axis conversion and J-Ra U correction etc. on the signal, if the content is in the RF product signal lead-in area, the TOC data is
51 has a 6th opinion.

If the contents of the above RF product signal grogram area are the same, the audio data and address data are divided by 1.
+I=L, audio data is output to the 1) A conversion circuit 152, and address data is output to the current address memory 153. And the above audio data is D
The data is returned to the original analog data by the A conversion circuit 152, and is used to drive, for example, a speaker (not shown in FIG. 9) via the output terminal 154. The address data is currently stored in the address memory 153 sequentially.

Here, a case will be described in which a search function is performed to select a desired song from among a plurality of songs recorded on the disc 140. In other words, 155 in FIG. 2 is a key date section, which corresponds to the valley keys 115 to 134 in FIG.

Each of the keys 115 to 1 of this key date section 155
34 according to a predetermined procedure, it is possible to set the song number (TNO) of the song to be selected and the relative address within that song. For example, song number “5.
If you want to select the beginning of the song "5", you only need to set the song number to r5J. (assuming that the total performance time is longer than 3 minutes), set the song number to "5" and set the relative address of the song to "
You can set it to 3 minutes.

Then, the track number and relative address set on the keyboard section Z 55 as described above are stored in the destination address memory register 156. This eye 1 white address memory register 156 stores the song number in the lead-in data memory 1.
51, and the relative address is output to one input terminal of the adder circuit 157. Then, first, the lead-in data memory 151 reads out the absolute address of the beginning of the song corresponding to the song number output from the destination address memory register 156, and outputs it to the other input terminal of the adder circuit 157.

At this time, if a relative address is not set in the target address memory register 156, then the adder circuit 1
Since one input terminal of 57 is "0", the absolute address outputted from the lead-in data memory 151 is added to rOJ by 1v, and as a result, the output terminal of the adder circuit 1570 is output from the lead-in data memory 151. The output absolute address is output as is, and this is the pickup 14.
2t - This is the absolute address of the destination position to be moved. Also, the destination address memory register I56
VC: If a relative address is set, this relative address and the absolute address output from the lead-in data memory 151 are added together in an adder circuit 157, and this added output moves the pickup 142 to 111. It is the absolute address of the exponent [1 position iiM.

On the other hand, the current address memory I 5.9 Vr,)
;j: Since the address data of the current position 1d of the pickup 142 is stored in Me, the absolute address is read out from the address data and is supplied to the first position matching circuit 15B. Further, from the addition circuit 157, U
The input absolute address is sent to the second position calculation circuit 159.
supplied to The first and second position calculation circuits 158
．． 159 is based on the absolute address, which is temporal information, and determines the radius (
distance information). For example, if the absolute address is 10 minutes, t, how many cm is the radius of the disk 1400?
u ] is calculated. That is, the output of the first position calculation circuit 158 is the radius data of the current position of the pickup 142, and the output of the second position calculation circuit 159 is the radius data of the target position to which the pickup 142 is to be moved. It is.

Then, the first and second (j7. IiX tears r-0
The nominal radius data output from circuits 158 and 159 are subtracted from one by the other by a subtraction circuit 160, and the absolute value of the difference component is output. Therefore, the output of the subtraction 0 circuit 160 becomes distance data indicating the distance between the current position of the pickup 142 and the target position. The distance P'-data outputted from the subtraction circuit 160 is set as initial data in a movement meter/counter 161, and is also supplied to a kick pulse generation circuit 162, which will be described later.

Further, the current address memory 153 and the addition circuit 15
Each absolute address output from 7 is supplied to a subtraction circuit 163 and a turn number construction circuit 164, which will be described later. This subtraction circuit 163 subtracts one of the input absolute addresses from the other, and outputs the difference component and the time difference component between the current position of the 1° repeat pickup 142 and the target position to the numerical comparator 165. Then, the numerical comparator 165 compares the time difference component outputted from the subtraction circuit 163 with a reference value (this reference value is related to the width of the kick pulse that can be generated by the kick pulse generation circuit 162). Here, the numerical comparator 165 sets the first output terminal O1 to a high level when the time difference component is larger than the reference θ value and when the distance between the current position and the target position of the single pickup 142 is long. (hereinafter referred to as H level) and the time difference component is smaller than the reference value, the pick-up 14
When the distance between the current position of 2 and the target position is short, the 2nd
Output end 0! is set to H level.

Then, the subtraction Q6 circuit 163 determines whether the subtraction result is positive or negative, whether the target position is on the outer circumference side of the disk 140 or on the inner circumference side with respect to the current position of the pickup 142. polarity signal, depending on the
The signal is supplied to a level shaping circuit 166 and a polarity inverting circuit 167.

Here, the key is pressed by the - key part 155 to the song 1r.
(TNO), relative address, etc. are set, and when the last operation that corresponds to the reach function of the keypad section 1550 is completed, this DAI) playback device jrl &, L server! Start Vb creation. Simultaneously with the start of this search 1iBj operation, the search switch 168 is turned on. One end of this 9'-chi switch 168 is grounded via a DC YM source 169 with the polarity shown, and the other end is a serator hit flip-flop circuit (hereinafter S-RF
170 (referred to as F circuit). Therefore, when the search switch 168 is turned on, the set input terminal S of the S-RFF circuit 170 becomes H level, so that its output terminal Q is set to H level.

Now, with respect to the current position of the pickup 0142, the inner eye position 11 is on the outer peripheral side of the disk 140, and the distance between the current position fire and the inner eye position 11't is sufficiently far. do. Then, d(Since the first output terminal O1 of the IIX converter 165 is at 1 level and the output terminal Q of the S-RFF circuit 770 is also at H level, both outputs are 0+.

The output terminal of the AND circuit 171 to which Q is connected to the input terminal is)
(The output of this AND circuit 171 is supplied to one input terminal of another AND circuit 172.

The output terminal of a monostable multivibrator 173 is connected to the other input terminal of this AND circuit 172. Here, the monostable multivibrator 173 is ]1-Ii
It always outputs H and R signals, and the above-mentioned movement! ! Il,
Silk needle η.

When a flow signal, which will be described later, is generated from the counter 161, this flow signal is used as a trigger to maintain a low level (
It outputs a signal at L level (hereinafter referred to as L level).

Therefore, the output terminal of the AND circuit 172 becomes level I, which causes the switching circuit 150 to transfer the output of the level shaping circuit 166 to the
3. That is, this switching circuit 150 is switched so that when the output terminal of the AND circuit 172 is HL/bevel, the output of the level shaping circuit 166 is supplied to the pickup feed motor 143, and the output terminal of the AND circuit 1
When the output terminal of 72 is at the level ■, F+il delivery 1-overnight the output of the control circuit 149 is picked up and the feed motor 14
It can be switched to supply 3. Therefore, in the 11) live state of 8+, the search switch 16
8 is in the off state, the output terminals of the S-RFF circuit wrI70 are at the Q&↓L level, so the output terminals of the AND circuits 171 and 172 are both at the L level,
Bip-up f feed motor 143 is feed υ motor control circuit 1
It is controlled by the output from 49, and stable reproduction is performed.

Here, as described above, in the search operation, the Ili output terminal of the AND circuit 1'12 is at H level. Therefore, the pickup feed motor 143 is controlled 61) 1 by the output of the level shaping circuit 166.

The level shaping circuit 166 has a constant level of positive or negative polarity based on the polarity signal output from the subtraction circuit 163. On 14! l+ This outputs the iris code. And this “gift, pick 1
With respect to the current position of 42, the intra-eye position f, 7, 1. Since the outer periphery of the disk 140 is filled IIC, the reduction 3γ circuit 1
The result of subtraction of 63 is positive. For this reason, the reduction η.

The circuit 163 outputs the polarity number 151 corresponding to the subtraction result "positive", and the level 48% type circuit 166 picks up the drive signal of the positive polarity level and sends it to the motor 143.
The pickup 142 is moved toward the outer circumference of the disk 140 by applying a W force to the disk 140 . In addition, the subtraction circuit 163
If the subtraction result is negative, the subtraction circuit 163 outputs a polarity signal corresponding to the "negative" subtraction result, which causes the level shaping circuit 166 to output a drive signal with a negative polarity level. , pickup 142 or 2 disks 14
0 in the inner circumferential direction.

On the other hand, the search switch 76g is turned on and the S-RF
When the output terminal Q of the F circuit 170 reaches level 11, nIJ
Since the output of the monostable multivibrator 173 is at the if level, the output terminal of the AND circuit 174, to which both outputs 1 are connected to the input terminals, is at the H level. Then, the switch circuit 147Jl is controlled to be in the off state. That is, this switch circuit 147 is the AND circuit 1
It is controlled so that when the output terminal of 74 is at H level, it is in the off state, and when it is at L level, it is in the on state.

Therefore, under normal playback conditions, the search switch 168
is off 1. Since the output terminal of the AND circuit 174 is at L level, the switch circuit 14
7 is turned on, and the tracking control circuit 145
Tracking service is applied to ensure stable playback.

However, as described above, in the search state in which the pickup 142 is moved by the drive signal output from the level shaping circuit 166, the switch circuit 147 is turned off. Tracking serve is not applied as ji, so that pickup 1'42 can be smoothly moved without being affected by tracking serve.

Here, as described above, the pickup 142
When the pickup 1 is moved toward the outer circumference of the
42 is the original position (top 1).

To be specific, the distance 1ii11 moved from the current position is detected by the kick-up position detection circuit 175. This pickup position detection circuit 175 will be described in detail later, but when the pickup 142 is moved in the radial direction of the disk 140 and crosses the tracks, the pickup position detection circuit 175 detects one track (41゛, one for every cut)゛? This outputs a position detection signal that generates a pulse.

For this purpose, the movement amount calculation counter 161 sequentially tosses the pulses of the 1iffi detection signal output from the big-up position detection circuit 175 in the reverse direction, starting from the previously set initial data. The movement amount calculation counter 161 has a count result of all i.
o-+tona. generate the flow signal when the i
It is output to Hayashi stable multivibrator 173. Therefore, the output terminal of the monostable multivibrator 173 becomes L level, and thereby the output terminals of AND circuits 172 and 1174 both become L level. Therefore, the switching circuit 15
0 is switched to supply the output of the feed motor control circuit 149 to the pickup feed motor 143, the movement of the pickup 142 toward the outer circumference of the disk 140 is stopped, and the switch circuit 147 is turned on and the tracking sensor? or will be administered. Then, the disc game 140 is reproduced at the position where the pickup 142 stops.

Here, at the point 14 where the pickup 142 stops,
This position is approximately the same as the target position described above. That is, the initial data set in the movement amount calculation counter 161 is the initial data set in the movement amount calculation counter 161, as described above,
This is distance data indicating the distance between the current position of No. 2 and the destination position. On the other hand, the first pulse detection signal outputted from the pick position detection circuit 175 is the first pulse in which one pulse is generated every time the pickup 142 crosses one track on the disk 140. As mentioned above, since 4 is 1.6 [μm], it basically indicates the distance that the pickup 142 has moved from the current position 16. For this reason, the movement amount hand 4. cow/ri1
Starting from the initial data set to 61, move to the above position +gt
The pulses of the detection signal are sequentially counted in the reverse direction, and the fact that the count results are all "o" means that the pickup 142 has traveled the distance between the current position and the target position. This is especially true.

Therefore, theoretically, the position where the Big Ara F142 stops coincides with the target position, but in reality, due to eccentricity of the disk 140, variations in track pitch, etc., the position is approximately equal to the target position. This is what is done.

Then, as described above, the disk 140 is moved to the stopped position of -t.

At this time, the R
The F-fold signal is again separated into audio data and address gator in the process circuit 146, and the address data is sent to the current address memory Z 5 , ? is memorized. Then, the absolute address of the new address data stored in the current address memory 153 and the index rank 11! outputted from the adder circuit 157! (The absolute address of the first and second position meter 3!1.Circuit 15FJ, I59
The new distance data is subtracted by the subtraction circuit 160 through the respective distance data, and this new distance data is set as initial data in the movement titit calculation counter 161. Here, the monostable multivibrator 1'13d is set to hold the L level for a sufficient period of time to perform playback at the position where the pickup 142 is stopped and to store the address data in the current address memory 153. There is. Then, when the output terminal of the monostable multivibrator 173 is returned to 1 (level), the further search operation described above is started again.

Pick up 1 in 2nd search I'J3 work like this
42 is stopped again, the pickup 142 moves to its stop position #7. The playback operation is then performed, and the series of search operations described above are repeated.

Here, repeating such a search operation means that the absolute address of the current position 1 of the pickup 142 output from the current address memory 153 and the absolute address of the target position output from the adder circuit 157 are extremely different. equal υ
, when the time difference component output from the subtraction circuit 16g becomes smaller than the reference value of the numerical comparator 1650. That is, the above four sentence value converter/Plator 165
When the time difference component output from the subtraction circuit 163 becomes smaller than the reference value, the first output terminal O1 is set to L level, and the second output terminal O2 is set to level 11. Then, the output terminals of the AND circuits 171 and 172 both become L level, so the switching circuit 150 switches to the feed motor control circuit 14.
This is because the output of 9 is switched to be supplied to the pickup feed motor I 4 J.

Furthermore, when the time difference component output from the subtraction circuit 163 becomes smaller than the reference value of the numerical converter 165, it means that the difference between the current position of the pickup 142 and the target position on the disk 140 is This is when the number of tracks is several tracks, and the distance is less than several [μm].

Then, when the second output terminal 02 of the numerical converter/IP converter 165 is set to H level, the S-RFF circuit 1
Since the output terminal Q of 70 is also 1 level, both output terminals 02
, Q are connected to the input terminals of the AND circuit 176, and the output terminal of the AND circuit 176 becomes H level.

Here, when the second output terminal 0 of the numerical controller or the regulator 165 is set to H level, the movement of the pickup 142 is stopped during the above-mentioned search operation and the movement is stopped at that point frt. Since this is the time when the address data is read, the output terminal of the monostable multivibrator 173 is set to L level. Therefore, when the output terminal of this monostable multivibrator 173 is returned to the II level, the output terminal of the AND circuit 177 to which this output terminal and the output terminal of the AND circuit 176 are connected to the input terminal is set to the H level. . For this reason, the kick and pulse generating circuit 162 is driven.

This kick/'P pulse generation circuit 162 outputs a so-called kick pulse for accurately moving the converging lens in the pickup 142 by several tracks, and is output from the subtraction circuit 160, the details of which will be described later. Based on the distance data (several tracks)
A kick pulse is generated to move the converging lens of the pickup 142 by a distance corresponding to .

Then, the kick pulse is determined to have a positive polarity or a negative polarity by a polarity reversing circuit 167 based on the polarity I/H outputted from the subtraction circuit 163, and then sent to the addition circuit 163.
8 to 11 (at this time, the output terminal Q of the S-RFF circuit 170 and the monostable multipipe lake 173
Since the output terminals of are both ■ level, the AND circuit 174
The output terminal of the switch circuit 147 is set at T'l level, and the switch circuit 147
Tracking is not possible because it is off.

-D is not added to M (+).

The kick pulse is then supplied to the pick-up feed motor 143 via an adder circuit 148 and a feed motor control circuit 149 and a switching circuit 150. At this time, the converging lens of the pickup 142 is moved several tracks to reach the target position.

Note that the kick pulse above is of positive polarity and negative polarity.
The converging lens of the first pickup 142 is the disk 140.
The disk is moved by several tracks in the outer and inner circumferential directions. Then, when the converging lens of the pickup 142 reaches the target position and that position is reproduced, the above-mentioned successful address memo is displayed! J I 5. ? The absolute addresses output from the adder circuit 157 are completely equal. For this reason, above) J? Turn-several output circuit 164
(Detects that the address of the artist perfectly matches 1 and connects it to the reset terminal R of the S-RFF circuit θ.
Input a level III signal. Then, the s-Rrp circuit 170 is reset and its output terminal Q is inverted to the L level, and all of the search operations are completed here (Z). Then, the output terminal Q of the S-RFP circuit 170 is L.
By reaching the high level, the output of the AND circuit 174 also becomes the H level, and the switch circuit 147 is activated and tracking servo is applied, so that the 6th generation can be performed safely from the selected target position. It is something that becomes.

Next, the pickup position f! '? The details of the detection circuit 175 will be explained. In other words, the pickup position detection circuit 175 utilizes the tracking error signal output from the tracking control circuit 145. As shown in FIG. 3, the input terminal 17B to which the tracking error signal is supplied is connected to the movement amount calculation unit 161 via the level comparator 179 and the output terminal 180. It is something that is connected.

That is, as mentioned above, the tracking error signal has negative polarity and positive polarity due to the spot of the original beam on the surface of the disk 140 being shifted from the center of the track toward the inner and outer circumferences of the disk 140. The absolute value level changes depending on the magnitude of the deviation, and when the spot is located at the center of the track, the signal becomes O level. Therefore, when the spot is moved in the radial direction of the disk 140 and crosses a plurality of tracks, the change in the σ tracking error signal will be as shown in FIG. 4(,). In Figure 4 (,), the period in which the tracking error signal is upward to the right in the figure indicates an area in which tracking service is possible, and the period in which the tracking error signal is at 9 in the upper left in the figure indicates an area in which tracking service is not possible. be. Therefore, the 0 level cross point of the tracking error signal during the period shown in the upper right corner of the figure indicates that the spot is located at the center of the track, and the O level cross point of the tracking error signal during the period shown in the upper left corner of the figure indicates that the spot is located at the center of the track. The point is,
This indicates that the spot is located in the center between the track and other tracks adjacent to the track. Therefore, one cycle of this tracking error signal corresponds to the spot crossing one track.

Therefore, when the tracking error signal 1 degree level comparator 179 compares the 0 level and generates H level and L level signals when the level of the tracking error signal is thicker or smaller than the O level, as shown in FIG. A waveform as shown in b) is obtained. and,
Since one cycle of the pulse waveform corresponds to the spot crossing one track, one pulse is generated every time the spot crosses one track on the disk 140. This serves as a position detection signal.

Next, the kick pulse will be described and explained.

That is, this kick pulse, as shown in FIG.
When the start of generation is requested at time T1, a positive polarity and constant level signal is output, this is inverted to a negative polarity and high level signal at time T2, and returns to the original 0 level at time T3. .

Then, at time T1, the converging lens of the pickup 142 begins to move toward the outer circumference of the disk 140, and its moving speed reaches its maximum at time T2, and is thereafter firstly decelerated by the negative polarity level signal. , the movement of the converging lens of the pickup 142 is stopped at time T3.For this reason, the kick pulse generation circuit 162 is connected to the subtraction circuit 1.
By appropriately setting the width from time TI to T3 based on the distance gator output from the pickup 142, the converging lens of the pickup 142 can be moved by a predetermined number of tracks.

Here, the pickup 142 receives a negative polarity level signal.
By applying a brake to the movement of the converging lens in the outer circumferential direction of the pickup 142, it is possible to prevent the converging lens of the pickup 142 from overrunning the target position due to its shell characteristics, or causing damped vibrations before and after the target position and making it difficult to stop at the target position. Therefore, the converging lens of the pickup 142 can be quickly moved to the target position 1,
Moreover, it can be made to stand completely still on the track at the target position.

Also, the converging lens of the pickup 142 is connected to the disk 14.
When moving in the inner circumferential direction of 0, the time 'rl-'r
, it is sufficient to use a negative polarity level signal A, and a signal from time T to T3 to be a positive polarity level signal. Then, a kick pulse is output to move the converging lens of the pickup 142 toward the outer circumference of the disk 140, or a kick pulse is output to move the convergent lens of the pickup 142 toward the inner circumference. The derating circuit 1 depends on whether the signal is output.
This is set by the polarity inversion circuit 167 based on the polarity signal output from the polarity inverter 63.

Note that the time T2 at which the polarity level is reversed from the positive polarity level to the negative polarity level and from the negative polarity level to the positive polarity level does not necessarily have to be at the center of the times Tl and T3. Depending on the number of tracks to be moved, etc., the kick pulse generation circuit 162
It can be controlled by.

Therefore, according to the search method shown in Figure @2,
First, the current position of the pickup 142 is $, (7) the radius of the disk 140 at that position is calculated from the absolute address,
From the absolute address of the target position to the disk 140 at that position
The distance to which the pickup 142 should be moved is determined by calculating the difference between the two (distance data). Then, A? of the position detection signal that generates one noguru every time the pickup 142 is moved and the Sufbat crosses one track. Since the movement of the pickup 142 is stopped when the distance traveled by the pickup 142 becomes equal to the above-mentioned distance data by counting the number of loops, the pickup 142 can be quickly and accurately moved to the target position.
The performance of the search function □ can be improved.

In this regard, conventional speed means operate as follows. First, [” is the song number of the lowest ff3H (TN
O) and the Japanese text in the song/1 address is specified,
The pickup glue determines whether one target position with respect to the position cage is the inner circumference side or the outer circumference side of the disk, and moves the pickup in the determined direction.

At this time, focus servo and tracking servo are applied so that the address data is always read even while the pickup is moving. Then, the pickup is moved until the song number in the read address data matches the song number at the target position. next,
The moving speed of the pickup is moved until the "minute" digit of the relative address in the read address data matches the "1 minute" digit of the relative address of the target position. In addition, the moving speed of the pickup is further slowed down and the "seconds" digit of the relative address in the read address data is changed to "seconds" digit of the relative address of the target position.
The pickup is moved until it matches the "second" digit, and the pickup is moved to the target position.

For this reason, the pickup was moved! Even at its fastest speed, the speed must be such that the address data can be retrieved by 1°1, which poses the problem of not being able to perform a quick search operation.

However, according to the search means shown in FIG.
Since the pickup 142 is moved, there is no need to read out the address data during the movement, and the movement speed of the pickup 142 can be increased, and a quick reach operation can be performed.

Furthermore, if the configuration is simple, especially if a microcomputer is used, it goes without saying that most circuits can perform their functions through program processing.

Furthermore, during the search operation, the drive signal output from the level shaping circuit 166 and the kick pulse generation circuit 162 are used to pick up the pickup 14 by the kick noculus.
2 is being moved, the switch circuit 147 is turned off and the tracking sensor is turned on. Since it is not applied, the pick-up center 7″Z42 and the convergence 1/ns V in it are
j1, disc 14 without receiving any tracking serve
Since the eye is moved in the 00 radial direction, smooth movement can be achieved, and the eye can be moved forward to the inner position of the eye.

In addition, since the pickup 1420 position detection signal is generated using the change in tracking error No. 111 that occurs when the spot actually crosses the track, Exactly one noculus can be generated each time the tip traverses one track, ensuring reliable operation. Furthermore, since position detection No. 8'' is made into a pulse waveform through the above-mentioned tracking y:r and t-signals through the level comparator 179'i:, it can be realized with an extremely simple configuration. be.

In the search operation described above, first, if the distance between the current position of the pickup 142 and the intra-eye position t is long, the pickup 142 is moved greatly by the drive signal output from the level shaping circuit 166, 14
The distance between the current position of 2 and the 1st hook of the eye is the predetermined 1F.
When Ci becomes a concave circle, the kick pulse is used to move the converging lens of the pickup 142 to the target position, so that all search operations can be performed quickly and accurately.

When the distance between the current position of the pickup 142 and the target position is long as in the case above, the pickup 142 is moved by the drive signal output from the level shaping circuit 166, and the current position of the pickup 142 and the target position are moved. A feature of the present invention is that when the short distance W between the two positions is within the tyr constant range, the converging lens of the pickup 142 is moved to the target position by a kick pulse.

It should be noted that the present invention is not limited to the above-mentioned embodiments, and can be implemented with various modifications without departing from the gist thereof.

〔Effect of the invention〕

Therefore, as detailed above, according to the present invention, it is possible to perform a quick and accurate search function with a simple configuration, especially in a disk record playback device that plays back a disk on which digitized data is recorded. An extremely good disc record playback device can be provided.

[Brief explanation of drawings]

Fig. 1 is a front external view showing an outline of a CD type CAD playback device to which the present invention is applied, and Fig. 2 shows an embodiment of a disc record playback device according to the present invention.
Block configuration diagram showing the electric circuit system of the AD playback device, Part 3
The figure is a block configuration diagram showing the pickup position detection circuit of the same electric circuit system, FIGS. FIG. 3 is a waveform diagram for explaining a kick pulse in the same electric circuit system. 110...cabinet, 111...disk unit J
j+1 copy, 112... eject key, 113...
Power key, 114...Display section, 115...Reverse key, 116...Fast forward key, 11
7...Play key, II8...Next play key, 119...Repeat key, 120...71? -Z key, 121...Stop key, 122 to 13...
...Numeric keys, 132...Memory read key, 133
...Memory key, 134...Clear key, I40.
...yゝisk, 141...disc motor, 142
...Pickup, I43...Pickup feed motor, 144...Focus control circuit, 145...
Tracking control circuit, 146...process circuit, 1
47...Switch circuit, 148...Addition circuit, 14
9...Transmission motor control circuit, 150...Switching circuit,
151...Lead-in data memory, 152...D
A conversion circuit, I53...Current address memory, 154
...Output terminal, 155...Key is - code part, 156.
...Target address memory register, I57...Additional a circuit, 158...First position calculation circuit, 159...Second position calculation circuit, 160...Subtraction circuit, 161 Movement amount calculation counter, 162... Numerical value comparator, 163... Subtraction circuit, I6 I... J-turn coincidence detection circuit, 165... Numerical comparator, 166...
・Level shaping circuit, 167... Polarity inversion circuit, 168
...Search switch, I69...DC power supply, 170
...S-RFF circuit, 171.172...AND circuit, 173...monostable multi-novel breaker, 17
4...AND circuit, I75...Pickup position detection circuit, 176.177...AND circuit, 178...
・Input terminal, 179...0 level connector, 1
80...Output terminal.

Claims (1)

[Claims] In a disc record playback device that reads digital data and temporal information from a disc on which digital data obtained by converting an information signal into PCM and temporal information is recorded through an optical pickup, the pickup should be moved. a setting means for setting temporal information of the destination position; and a setting means for comparing the temporal information set in the setting means with the temporal information read from the pickup to determine the current position of the pickup and the target position. a determining means for determining whether the distance between the current position of the pickup and the target position is greater than or equal to the predetermined distance; calculation means for calculating radius information of the disk corresponding to each temporal information based on the temporal information set in the setting means in the determined state and the temporal information read from the pickup; subtracting means for subtracting each radius information calculated by the calculating means to generate distance data between the current position of the pickup and the target position and a drive signal for moving the picker 7'' in the direction of the target position; A movement amount detection means that generates movement amount detection data corresponding to the distance by which the pickup is moved in the student direction of the disk by the subtraction means, and apparatus detection data constituted by this movement amount detection means are stopping means for stopping the movement of the pickup in a state corresponding to the calculated distance data; and determining means for determining that the distance between the current position of the pickup and the destination position is within the predetermined distance. 1. A disc record reproducing apparatus comprising: kick noise generating means for generating a kick pulse that moves a converging lens of the pickup by the distance determined in the determined state.