JPS5952462A - Disc record reproducer - Google Patents

Abstract

PURPOSE:To attain quick search, by shifting a pickup by a distance based on a distance data between the radius of the present position and that of the objective position of the pickup, in the reproduction of the disc on which a digital data is recorded. CONSTITUTION:The radius of a disc 140 at the present position and the objective position is calculated from the absolute address of the positions of a pickup 142 and the distance to shift the pickup is determined by obtaining the difference of the both. Then, the number of pulses of the position detecting signal generating one pulse every time the pickup is shifted and a spot crosses one track is counted and when the shift distance of the pickup is equal to the said distance data, the shift of the pickup is stopped. Further, the pickup 42 reproduces the lead-in area and the TOC data is stored in the lead-in data memory 151, then the pickup 142 is shifted forcibly in the program area once. The pickup is shifted to the position of the absolute address ''0'' with the searching from the position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a disc record playback device suitable for, for example, a CD (optical continuous disc) system DAD (denotal audio disc), and particularly relates to This paper relates to improvements in data reading.

[Technical background of the invention and its meaning; 11 points] Recently, in the field of audio equipment, in order to achieve as high fidelity as possible, P
A digital recording and reproducing method using CM (pulse code monochrome) technology is being adopted. This is called digital audio, and the audio characteristics are independent of the characteristics of the recording medium, and are much better than those using the conventional analog recording method. This is because it is established in principle that it is superior.

In this case, a system that targets a disk (circle m) as a recording medium is called a DAD system, and optical, electrostatic, and mechanical systems have been proposed as recording and reproducing methods. However, no matter which method is adopted, it is necessary that the equipment that implements it must satisfy various control functions and performance that cannot be found in many conventional products. It is required to be what you get.

In other words, if we take the CD system as an example,
A transparent resin disk with a diameter of 4412 (cm) and a thickness of 1.2 (mm) is bonded with a metal #j converter that forms bits (irregularities with different reflectances) that are compatible with digital (PCM) r-rays. The disk is driven to rotate at a variable rotational speed of approximately 500 to 200 [r, p, m) using the CLV (+i4+constant speed) method, and is internally driven by an optical pickup with a built-in semiconductor radar and photoelectric conversion element. The disc has a track pitch of 1.6 μm, which is necessary because it generates linear track 77 type 11) from the circumferential side to the outer circumferential side.
m], and even one side can be played in stereo for about 1 hour.A huge amount of information is available in the zologram area (radius 25~1＠-
8 (mm:] ), and their index data etc. are recorded in the lead-in area (radius 23~
This can easily be seen from the fact that it is recorded in 25 [m]).

However, this conventionally known glazed disc record playback device is still in the development stage, and there are particular problems with the operation of reading data recorded in the lead-in area and program area. There are many malfunctions, and nothing that can be done accurately and quickly has yet been realized, so it is considered an issue that needs to be solved urgently.

[Purpose of Issue 8Av] This invention was made based on the above-mentioned circumstances, and is particularly intended to provide a quick and accurate r-data reading device with a simple configuration in a disc record playback device that plays back a disc on which digitized data is recorded. It is an object of the present invention to provide an extremely good disc record playback device that can perform the following functions.

[Summary of the invention]

- J/I: My invention, Jin, has a lead-in area where Daigleop content data is recorded on the inner side, and a Solo program area where digitized data is recorded on iC. In a disk record player, the optical pickup is moved from the inner circumference to the outer circumference side for the 111J on the outer circumference, and the data in the front lead-in area and the groove area are sequentially read out. Detecting means for detecting that all the table of content data in the own lead-in area has been extracted; A means of transportation that forcibly moves up to
It is characterized by comprising a search means for moving the self-pickup to a predetermined position within the previous item's grodarum area, and is equipped with an upstream device for quick and accurate data reading.〇〇〇Invention Embodiments] Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. - First, this invention is directly applicable71. An overview of the CD-based DAI) Nyu apparatus will be explained below.

In Figure 1, the front outer iron is shown in Figure 1. In Figure C1, 111 is the gear vignette IJO (the force/garupokut type disk loading section that is freely provided). , On the left side of this disk loading section 111, there is an eject (wJ ECT) for disk loading section 1.
key 112 and 'F+L source
ER) key 113 is provided.

In addition, on the upper right side of the disk loading section 11, there is a display section 114 for displaying the percentage type, a reverse (Ri211) key 115 for so-called Bano sword operation, and a fast forward (F) key 115 for fast forward operation.
ii" ) key 116 and a play (pLAY, ) key 117 for operating the play. Similarly, in the middle row, a Next Gray (1! JEX'r Pi, A
Y) key 118 and repeat (REPEA゛1 key 1)
19, a pause (pAcrsm) key 120, and a stop key 12.

Similarly, 0, 1, 2. ..., 9 number key 1
22 to 13 and memory read (MREAD) key 1
32, a memory (Ryu MoRY) key 133, and a clear (CLEAR) key 134 are provided.

The above-mentioned display section 114 displays an eject (EEJ) button.
ECT) display 114a, search (IARcH) display J14b, error (ERROR) display 114
el repeat (REPEAT) display 114d, manual (MANUA, L) display 114e, auto gray (AU'rO) display 1i4t, memory (MEMORY)
) Memory indicator (MHI:MORYINDICATOR) with display 114g and 8naya/nel J J
4 h and song%'i (MUSICNQ) indicator 11
41 and a time (TIME) indicator 114j.

In addition, the gray (PLAY) key 112 and the pause (p
Gray (PLA) keys 120 also have gray (PLA) keys.
Y) Display 114k and PAUSE display 1
14t is provided.

Here, FIG. 2 shows the basic configuration of the electric circuit system of the CD type DAD reproducing apparatus shown in FIG. That is, a disk 140 in FIG. 2 is attached to the disk loading section 11 and connected to the disk motor 141 so that its rotational force is transmitted when the disk loading section 11 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 1400, and is supported by a pickup feed motor 143.
It is moved by the driving force of. Note that the pick horn 42 is actually provided on the side where the disk motor 141 is attached (that is, the lower side of the disk 140 in FIG. 2), but it is drawn on the upper side of the disk 140 in FIG. 2 for convenience. I'll decide.

The pickup 142 is equipped with a laser emitting section, a beam splitter, a converging lens, a photoelectric conversion element, etc. (not shown), and first, the laser beam irradiated from the laser emitting section passes through the beam sinter and passes through the converging lens. The beam is converged and focused (spot) on the surface of the disk 140. Then, the radar beam changes depending on the presence or absence of a bit on the disk 140, is reflected, travels backward through the converging lens, and is guided by the beam sinter to the photoelectric conversion element.

For this reason, the photoelectric conversion system generates an electrical signal (hereinafter referred to as an RF multiplied signal) corresponding to the presence or absence of the pit and its temporal length.
is output, and the digitized data recorded on the disk 140 is read out here.

By the way, the program area (radius 25 to 58 [wa]) of the disk 140 contains a plurality of audio data (hereinafter described as songs) as well as the respective song numbers (TN
O), data indicating the divided areas of each song by dividing the same song in a complicated manner (hereinafter referred to as index data), data indicating the elapsed time from the start to the end of each song (hereinafter referred to as relative address), and The continuous elapsed time from the start of the performance of the first song to the end of the last song (
Address data such as data indicating a relative address (hereinafter referred to as relative address) is recorded in a 7" format. In other words, the above 1i3RF signal includes audio data and address data, and in this case, both data are parallel. It is read out as follows.

Also, the lead-in area (radius 2) of the disc 140 is
3 to 25 (m), there is data (table of contents ("rNo")) that is recorded in the no. Toe ) data) are recorded °
There is C.

Here, the main device (such as the DAD) normally positions the pickup 142 at an inner peripheral portion of the disk 140, specifically at a portion corresponding to the playback start position of the lead-in area of the disk 140. . The DADM main device also recognizes that the disk 140 has been loaded into the disk loading section 11, that the disk loading section 111 has been closed, and that the...! POWER
) key 113 is operated,
When the Daitsu motor 141 is rotated, the contents of the lead-in area are automatically read out (142). It is controlled so that 6L is placed in the part corresponding to the 111 play start position of the program area 140 and enters a standby state.For example, when the gray (PLAY) key 117 is operated in this standby state, the program area The contents of φ are read out.

Then, the R F output from the pickup 142 is
The iQ signal is supplied to a focus control circuit 144, a tracking control circuit M1145, and a no-loss circuit 146, respectively. Of these, focus? 1III Gouro 14
4 generates a focus encoder signal 0 from the ttF16 and feeds it to the pickup 142 so that the light beam is accurately focused on the wide disk 140 surface. Place the converging lens in the big '1 tube 142 in the direction 1r of the disk 140.
This is what is called focus en.

Further, the tracking control circuit 145 generates an L tracking error 'IM+j' in the RF signal. This tracking signal has a negative polarity and a positive polarity level due to the deviation of the light beam on the surface of the disk 140 from the center of the track toward the inner and outer circumference of the disk 14θ. The absolute value level changes depending on the magnitude of the deviation, and is O level when the spot is located at the center of the track. The tracking control circuit 145 sends the dragging error signal to a switch circuit 14 which will be described later.
7 and the pickup 142 via the connection 1 circuit 148.
The converging lens in the pickup 142 is controlled in the radial direction of the disk 14θ so that the spot of the light beam falling on the disk surface is accurately positioned at the center of the track, thereby creating a so-called tracking laser. It is used to perform po.

゛Also, the tracking error No. 1d output from the tracking control circuit 145 is transmitted to the switch circuit 14.
After passing through 7, send 9 motor? : is supplied to the front rotor pick-up drive motor 143 via the i control circuit 149 and the switching circuit 150 to be described later. It will be moved sequentially.

Further, the Zoroseth circuit 146 performs time axis conversion, error correction, etc. on the RF signal, and then converts the RF signal into
If it is the contents of the double signal lead-in area, the TO
The C data is stored in the lead-in data memory 151 mentioned above.

If the RF' signal is the content of the program area, the audio data and address data are separated, the A-dio data is output to the DA conversion circuit 152, and the address data is stored in the current address memory 153. Output. Then, the audio data is returned to the original analog data by the ohy7 conversion circuit 152, and is used to drive, for example, a speaker (not shown) via the output terminal 154. -Also, the address data is sequentially stored in the current address register 153.

Here, a search function for selecting a desired song from among the number of songs recorded in the notebook 140 will be explained. That is, 155 in FIG. 2 is a keyboard section, which corresponds to each of the keys 115 to 134 in FIG. 1.

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 "5". (assuming that the total performance time of the song is longer than 3 minutes), set the song number to "5" and set the relative address of the song to "5".
3 minutes" is fine.

The track number and relative address set on the keyboard section 155 as described above are the target address memory recorder 1.
BU2 is stored in 56. The target address memory register 156 outputs the song number to the lead-in data memory 15 and the relative address to one input terminal of the adder circuit 157. Then, first, the lead-in data memory 15 reads out the absolute address of the beginning of the song corresponding to number 4 output from the destination address memory register 156 and outputs it to the other input terminal of the adder circuit 157.

When the relative address is not set in the target address memory register 156, the adder circuit 15
Since one input terminal of 7 is "0", the absolute address outputted from the lead-in data memory 15 is added to "0", fL, or vc9, and as a result, the output terminal of the adder circuit 157 is IJ- The absolute address output from the input data memory 151 is output as is, and this is the pickup 1 address.
This is the address of the destination location to be moved to. Target address memory register 15
6 to 41" pair address has been set, this relative address and the absolute address output from the lead-in data memory 151 are added in an adder circuit 157,
The output of this addition becomes the absolute address of the target position 1Δ to be moved.

On the other hand, since address data of the current position of the pickup 142 is stored in the current address memory 153, an absolute address is read from the address data and supplied to the first position calculation circuit 158. 'Also, the absolute address V output from the adder circuit 157
1, second position meter) is supplied to the i circuit 159. The first and second position calculation circuits 158 and 159 calculate the radius (distance information) on the disk 140 corresponding to the absolute address, based on the absolute address, which is temporal information. For example, the 10 minute portion of the absolute address is calculated by calculating the distance in terms of the radius of the disk 140. In other words, the output of the position meter 2 circuit 158 of I, Jf, l is the radius data of the current position 1η of the pickup 142, and the output of the second position calculation circuit 159 is V'1, the pickup 142. This is the radius r of the target position to be moved.

The first and second position calculation circuits 158, 1.
Each radius data output from 59 is
At step 60, one is subtracted from the other, and the absolute value of the difference component is output. Therefore, the output of the earth 111 desecration circuit 160 becomes distance data indicating the distance between the current position of the pick-up unit 420 and the destination position. And this subtraction circuit 1
The distance data outputted from 60 is set as initial data in a movement amount calculation unit 161, and is also supplied to a kick/arm pulse generation circuit 162, which will be described later.

Further, the current address memory node 53 and the addition circuit 15
Output from 7 i'L, 6 fi absolute address is reduced n
The signal J'L is supplied to a circuit 163 and a pattern matching output circuit 164, which will be described later. This reduction force 1 peak 163 subtracts the other force from one force of each manually entered absolute address, and outputs the difference component, or the time difference component between the current position and the destination position of the shipping pick-up f 142, to the numerical comparator 165. Therefore, the numerical comparator 165 is connected to the ear reduction circuit 1.
63 output from the upstream (1, T between positive J 把minute) is a semi-standard value (this standard value is
(related to the width of the kick/zorus that can be generated). Here, when the time difference component is larger than the reference value, and when the distance between the right position of the Rima Civic Ag 142 and the target position is long, the comparator 165 outputs the first output 171. 0, ) are at a high level (hereinafter referred to as II level), when the above-mentioned wholesaler component is smaller than the standard number 1, and when the distance between the current position of Rima 9 Biku Atsuno 142 and the destination position is short, The second output terminal (0 snow) is set to H level.

Then, the subtraction circuit 163 determines whether the subtraction result is positive or negative (referring to the target position it'/with respect to the current position of the biquag 142). The level shaping circuit 166 and the polarity inverting circuit 1
67 to 9 (pay.

Based on this experience, when the last operation for setting the track number (TNO) and the relative address etc. (g) using the key 1ξ-word part 155 and the search function of the keyboard part 155 is completed, This DAD (') production bt starts a search operation. Simultaneously with the start of this - reach operation, the search switch 16B75i is turned on. One end of this search switch 168 is connected to the direct St power supply with the polarity shown. 169, and the other end is grounded to the Set 1 Noset 71 Nog Frozzo circuit (hereinafter referred to as 8-RFF circuit) 1700 Set input terminal).

Therefore, when the search switch 16B is turned on, the set input terminal of the B-RFF circuit 170 goes to the H level, so its output terminal (B) is set to the EH level.

Now, it is assumed that the target position is located on the outer peripheral side of the disk 140 with respect to the current position of the pickup 142, and the distance between the current position and the target position is sufficiently far. Then, the first output terminal of the numerical comparator 165 (
01) is at H level, and the output terminal Q) of the 5-RFF circuit 170 is also at H level, so both of these output terminals (O
The output terminal of the AND circuit 171 to which tL(2) is connected to the input terminal becomes H level. The output of this AND circuit 17 is supplied to one input terminal of another AND circuit 172. The other input terminal of this AND circuit 172 is connected to the output terminal of a single-pot fixed multi-inverter 173. Here, the above-mentioned monostable multi-inverter 1f3 is
Normally, an H level signal is output, and when a flow signal, which will be described later, is generated from the mobile counter 161,
This flow signal is used as a trigger to output a low level (hereinafter referred to as L level) signal for a predetermined period of time.

Therefore, the output terminal of the AND circuit 172 becomes H level, and the switching circuit 150 is thereby switched to supply the output of the level shaping circuit 166 to the pickup feed 9 motor 143. That is, when the output terminal of the AND circuit 172 is at the H level, the switching circuit 150 switches the output of the level stripping circuit 166 to the big-ag feed motor 1.
43, and when the output terminal of the AND circuit 172 is at L level, the feed motor control circuit 149
The output can be switched to supply the output to the shock pump feed motor 143. Therefore, in the normal playback state, the search switch 168 is in the off state.
Since the output terminal (Q) of the S-1tFF circuit 170 is at the L level, the output terminals of the AND circuits 171 and 172 are both at the L level.
43 is controlled by the output from the feed motor control circuit 149 to ensure stable reproduction.

Here, in the search operation as described above, since the output terminal of the AND circuit 172 is at H level, the GikAzzo feed υ motor 143 is controlled by the output of the level shaping circuit 166.

This level shaping circuit 166 is connected to the reduction n circuit 163 by □
It outputs a drive signal having a constant level with positive or negative polarity based on the output polarity signal. In this case, since the target position is on the outer circumferential side of the disk 140 with respect to the current position of the big ara f142, the reduced J
The subtraction result of the liM path 163 is positive. Therefore, the subtraction circuit 163 outputs a polarity signal corresponding to the subtraction result rt+, and thereby the level shaping circuit 166 outputs a drive signal of positive polarity level to the pickup feed motor 143, so that the big controller 76142 moves toward the outer circumference of the disk 140. This will be moved to . Further, when the subtraction circuit 163's decrement result is negative, the subtraction circuit 163 decrement>J result "
By outputting a polarity signal corresponding to "negative", the level shaping circuit 166 outputs a drive signal of a negative (bloody level), thereby moving the big ag 142 in the inner circumferential direction of the disk 140. It is.

On the other hand, the switch 168 is turned on and S
- When the output terminal (Q) of the RF F circuit 170 becomes H level, the output of the monostable multipipe lake 173 becomes H level.
Therefore, the output terminal of the AND circuit 174 whose both output terminals are connected to the input terminal becomes H level. Then, the switch circuit 147 is controlled to be in an OFF state. That is, this switch circuit 147 is the AND circuit 1
1liU nil 8 so that the output terminal of 74 is in the off state when it is at H level and is in the on state when it is at L level.
i. Therefore, under normal playback conditions,
Since the ST switch 168 is in the ON state, the output terminal of the AND circuit 174 is at the L level, so the switch circuit 147 is in the ON state. This allows for stable playback.

However, as described above, in the state where the pickup 142 is moved by the drive signal output from the level shaping circuit 166, the switch circuit 147 is turned off so that no tracking servo is applied, and the tracking servo is not applied. IL is provided so that the pickup 142 can be smoothly moved without being affected.

Here, as in the case above, the big roller f142 is moved toward the outer circumference of the disk 140.JL? When the Big Azzo 142 is in its original position (current position in the above explanation)
Pick up the distance traveled from 16
It is detected by the detection circuit 175. This pickup position detection circuit 175 will be described in detail later, but the pickup 14
2 is moved in the radial direction of the disk 1400 and outputs a position detection signal No. 18 which generates one pulse each time it crosses one track.

Therefore, the movement amount 614 counter 16 starts from the previously set initial data and sequentially counts the pulses of the device detection signal constituted by the pickup position detection circuit 175 in the reverse direction. Then, when the count result becomes all "0", the movement amount hi counter 161 generates the flow signal and outputs it to the monostable multipipe V-p 173. Therefore, the output terminal of the monostable multivibrator 173 is not at the L level, and thereby the output terminals of the AND circuits 172 and 174 are both at the L level. Therefore, the switching circuit 150 is switched to supply the output of the feed 9 motor control circuit 149 to the pickup feed motor 143, the movement of the pickup 142 toward the outer circumferential width of the disk 140 is stopped, and the switch circuit 147 is switched. Citruggi/gusade is applied in the on state. Then, the disc 140 is reproduced at the position where the pickup 142 stops.

Here, the position where the Bic Azzo 142 has stopped is approximately the same as the target position described above. That is, as described above, the initial data set in the movable lid gauge and counter 161 are the same as those set in the pickup 14 before the search operation.
This is distance data indicating the distance between the current position of No. 2 and the destination position. On the other hand, the device detection signal composed of the pickup position detection circuit 175 is a signal in which one pulse is generated every time the pickup 142 crosses one track on the disk 140, and the track pitch is 1 as described above. Since it is .6 [μm], it basically shows the distance that the pickup 142 has moved from its current position. Therefore, starting from the initial data set in the movement amount calculation counter 16 and counting the position detection signals in the reverse direction sequentially, the fact that the count results are all "0" means that the procedure must be corrected. This is because the picker f142 has moved by the distance between the current position and the destination position.

Therefore, logically, the position at which the pickup 142 stops coincides with the target position, but in reality, due to eccentricity of the disk 140, variations in the tracking angle, etc., the position where the pickup 142 stops coincides with the target position. It is what is done.

Then, the pickup 142 picks up the disk 140 at the stopped position as described above. At this time, the RF multiplied signal output from the pickup 142,
The processing circuit 146 separates the audio data and address data again, and the address data is stored in the current address memory 153. Then, the absolute address of the new address data stored in the current address memory 153 and the absolute address of the target position output from the previous adder circuit 157 are used in the first and second position calculation circuits 158 and 159. through the subtraction circuit 16 respectively.
0 is subtracted, and this new distance data is set in the movement amount calculation power counter 161 as initial data. here,
The monostable multivibrator 173 is set to hold the L level for a sufficient period of time to perform reproduction at the position where the pickup 142 is stopped and to store the address data in the current address memory 153. At this point, when the output terminal of the monostable malpipe grating 73 is returned to the H level, the search operation as described above is restarted.

When the movement of the pickup 142 is stopped again by such a second search operation, the pickup 142 returns to its stop position 16. The playback operation is then performed, and the series of search operations described above are repeated.

Here, by repeating such a search operation, the absolute address of the current position 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 become extremely equal. ,
The time difference component output from the subtraction circuit 163 is converted into a numerical value converter.
It is stopped when the value becomes smaller than the reference value of the 9 rater 165. That is, when the time difference component output from the subtraction circuit 163 becomes smaller than the reference value, the numerical converter 165 sets the first output terminal (01) to the L level and outputs the second output terminal (02). to H level. Then, since the output terminals of AND circuits 171 and 172 both become L level, switching circuit 150 is switched so that the output of feed motor i+i control circuit 149 is supplied to pick-up motor 143.

Also, the time difference component iL output from the subtraction circuit 163 is the threshold value con.! When the reference value J5 of the parameter 1650 is also small, it means that the distance between the current position of the pickup 142 and the target position is several tracks, and the distance is several [μm]. ]When the following occurs.

And, ``Nihi Morichichi and Naoko/・? Lake 165 2nd
output terminal (when 0 is made to kI level, the above
Since the output terminal of the FPll-11 path 170 (Q is also at I (level), both output terminals ('h) + (Q) are the input terminal VC
The output terminal of the connected AND circuit 176 becomes H level. Here, the color when the output terminal (02) of the numerical co/non-lator 16scvg2 is set to H level means that the movement of the pickup 142 is stopped during the above-mentioned search operation and at i)'t-1m. Since this is the time when the address data of is read out, 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 H level, this output terminal and the above-mentioned at/to circuit 17
The output terminal of the AND circuit 177, whose output terminal is connected to the input terminal, goes to H level.

Therefore, the kick pulse generation circuit 162 is driven.

This kick pulse generation circuit 162 outputs a so-called kick/4 pulse for accurately moving the pickup 142 by several tracks, and the kick pulse generation circuit 162 outputs the distance data output from the subtraction circuit Noro 0. Based on the distance 7 corresponding to the distance data (cut track)
Kick to move the moss pickup 142/1
Generate russ. Then, the positive polarity and negative polarity of the kick/4 pulse are determined by a polarity reversing circuit 162 based on the polarity signal output from the polarity reduction circuit 163, and are supplied to the forward self-increasing circuit 48. be done. At this time, the above 5
- Output terminal (Q) of RFF circuit 170 and monostable multi-
i Break I7. ? Since both output ends of the AND circuit 174 are at the H level, the output ends of the AND circuit 174 are set at the H level, and the switch circuit 47 is in the OFF state, so tracking servo is not performed.

The kick pulse is then supplied to the pick-up feed motor 143 via the add-0 circuit 148 and the feed motor control circuit 149 and the switching circuit iso. At this time, the pickup 142 is moved several tracks,
Here, the target position is reached. It should be noted that when the kick pulse is of positive or negative polarity, the pickup 142 is moved by several tracks in the outer and inner circumferential directions of the disk 140. Then, when the -'' Tsuquano 142 reaches the target position and that position is reproduced, the six absolute addresses output from the current address memory 153 and the boost circuit 157 become completely equal. Therefore, the pattern - Number output circuit 16
4 detects that both absolute addresses completely match, and sends the 5-RFFI! -! No. 16 at H level is output to the reset terminal of J path 170).

Then, the 5-RFF circuit '120 is reset and its output terminal (Q) is inverted to the L level, and the entire search operation is completed here. and.

When the output terminal (Q) of the 5-RFF circuit 170 becomes L level, the output of the AND circuit 174 also becomes I (level), and the switch circuit 147 is turned on and tracking servo is applied. Therefore, playback is stably performed from the selected target position.

Next, details of the pickup position IW 4mt exit path 175 will be explained. In turn, this pickup position detection circuit 175 is connected to the tracking control circuit 145.
This uses the tracking error signal output from the. As shown in FIG. 1
61 and 4× connected.

That is, J2N self-tracking error 4,4'+j
As mentioned earlier, the path of the light beam falling on the di δ 140 plane is 1? j) has a negative polarity and a positive polarity level due to deviation from the center of the track toward the inner and outer circumferences of the j' isk 40, and the absolute value level changes depending on the magnitude of the deviation. This is a signal that becomes 0 level when the spot is located at the center of the track at -C. Therefore, the %J:%Ij spot is 1400 on the disk.
If it is moved radially and crosses multiple tracks,
The change in the tracking error signal is as shown in FIG. 4 (,). In Fig. 4 (,), the period in which the tracking error signal is in the upper right corner of the figure indicates the area where tracking serve is not possible, and the period in which the tracking error signal is in the upper left corner of the figure is the area in which tracking serve is not possible. This shows that. For this reason, the period 00 level crossing point shown in the upper right corner of the figure of Tracking Error No. 1d indicates that the spot is located at the center of the track.
The 00 level cross point for the period shown in the upper left corner of the diagram is
This indicates that the track +5 is located in the center between the track and the other tracks adjacent to it. Therefore, C1, one period of this Toshigging Conicy Gi corresponds to the spot crossing one track group.

For this reason, the above tracking error signal is converted to a 0 level controller (0 level at the rater 179, !: Ratio L, the tracking error> - When the level of the signal is larger or smaller than the 0 level, H level and L level signals are output. When generated, a pulse waveform as shown in FIG. 4(b) is obtained.

In this pulse waveform, since the IJd period corresponds to the spot crossing one track, one pulse waveform is generated every time the spot crosses one track on the disk 140. This is position detection number 16.

Next, the front self-kick noculus will be explained.

As shown in Figure 5, this kick pulse is
When the start of generation is determined at time (TI), a positive polarity signal ♂ with a constant level is output, which is inverted to a negative polarity signal 1d with a constant level at time (r2), and at time (T3). It returns to the original 00 level. Then, at time (TI), the pickup 142 begins to move toward the outer circumference of the disk 140, its moving speed reaches its maximum at time (T2), and thereafter, it is sequentially decelerated by 8 t due to the signal of the negative physical property level. The movement of the pickup 142 is stopped at time (T3). Therefore, the kick pulse generation circuit 162 adjusts the pickup 142 to 91 constant by appropriately setting the degree width from time (Tx) to CTs) based on the distance 11jll data output from the music reduction circuit 160. It is possible to move as many tracks as you like.

Here, the pickup 142 receives a negative polarity level signal.
When the pickup 142 is used to moving in the outer circumferential direction, the pickup 142 may overrun the target position or cause damped vibrations before and after the target position, making it difficult to stop at the target position. Therefore, the pickup 142 can be moved quickly to the target position by 70% and can be completely stopped on the track at the target position.

In addition, when moving the pickup 142 in the inner circumferential direction of the disk 140, a negative polarity level signal is used from time (T1) to (T2), and a positive polarity level signal is used from time (T2) to (T3). And it is sufficient.

The polarity 46 output from the subtraction circuit 163 determines whether to output a kick pulse that moves the pickup 142 toward the outer circumference of the Y-I pickup 140 or a kick pulse that moves the pickup 142 toward the inner circumference. This is set by the physical property inversion circuit 167 based on .

Note that the time at which Pi changes from a positive polarity level to a negative one-singing level and from a negative polarity level to a positive polarity level (T is not necessarily the center between times (T1) and (T3)). Also, if necessary, for example, move the Big A, Zo142 TjJtJ
Depending on the number of tracks to be generated, etc., the kick/9 pulse generation circuit 162 can be used for appropriate control.

Therefore, if the search means as shown in FIG. The radius of the disk 140 at that position is calculated, and the difference between the two (distance data) is determined to determine the distance to be moved.

Then, when the pickup 142 is moved and the t spot crosses one track, the number of /l pulses of the position detection signal that is generated is counted, and the moving distance of the pickup 142 is equal to the above distance data. Since the movement of the big ara f142 is stopped when the pickup 142 is detected, the pickup 142 can be quickly and accurately moved to the target position, and the performance of the search function can be improved.

In this regard, conventional search means are performed as follows. First, when the track number ('rNO) of the target position and the relative address within that track are specified, the current position of the pickup is determined by determining whether the position is on the inner or outer side of the disc, and the pickup is move in the determined direction. At this time, a focus sensor and a tracking sensor are provided so that the address data is always read out even while the pickup is moving. and,
The pickup is moved until the song number in the read address data matches the song number at the target position.

Next, slow down the moving speed of the pickup and move the pickup 4 times until the "minute" digit of the relative address in the read address data matches the "minute" digit of the relative address at the target position. . 'Also, further slow down the moving speed of the pickup and move the pickup until the 1 second digit of the relative address in the address data extracted from the WC matches the 1 second digit of the relative address at the target position. In this way, the pickup is moved to the target position.

For this reason, the moving speed of the pickup must be fast enough to read the address data even when it is at its fastest speed, which poses a problem in that a quick search operation cannot be performed.

However, according to the search means shown in FIG. 2, based on the distance data between the radius of the Bicara f142's L cloth position and the radius of the target position, it is possible to move the Tsuquazzo 142 by that distance. Therefore, there is no need to read the address data during movement, the speed of movement of the pickup J42 can be increased, and a quick search operation can be performed.

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

Furthermore, during the search operation, the drive signal output from the level square circuit 166 and the kick noise and pulse generation circuit 16
When the pickup 142 is being moved, the switch circuit 147 is turned off so that the tracking servo is not applied, so the pickup 142 and the converging lens therein are y'isutsuku 4 without receiving any goobo
It will be moved in the radial direction of 0, so it can be moved smoothly and accurately to the [l position].

In addition, the position detection signal of the pickup 142 is generated by utilizing the change in the tracking error signal that occurs when the spot actually cuts across the track. It is possible to generate exactly one beam each time it traverses the area, ensuring reliable operation. Since the self-tracking error (ITho level comparator 179 is used to determine the pulse waveform), it can be realized with an extremely simple configuration.

Therefore, the above search operation first starts with the big ara f14.
If the same distance between the current position and the destination position in 2 is long,
When the pickup 142 is moved greatly by the driving number 4M output from the level shaping circuit 166, and the distance between the current position of the pickup 142 and the target position is within a predetermined range, the pickup 142 is moved by the kick/gust.
Since it is moved to the target position, a quick and accurate search operation can be performed.

Here, the above 1) Al) 41) As described above, the normal pickup 142 is positioned at the flS corresponding to the playback start position in the lead-in area of the disc 140, and the disc 140 is Disc loading section 111
When the disc loading section 11 is closed and the
When POWfi;R keyo 13 is operated,
The 'roc data in the lead-in area is read. Then, ff1i'l came out ゛['O
The data C7' is checked by the control circuit 146 and only correct data generation is stored in the lead-in data memory 151.

By the way, the TOC data recorded in the lead-in area of the disc 140 includes the track numbers (TNO) of the plurality of songs recorded in the program area and the starting point (start) of each performance, as shown in FIG. It shows the absolute address etc. That is, the lead-in area contains the first song Wf I-' i J, the absolute address of the beginning of that song, and 2.
The absolute address of the 1st column "2" of the th song and the beginning of that song,・
..., it is recorded in the order of the song number r'nJ of the song after J and the absolute address of the beginning of that song9. If this is one cycle, the number of controllers in one cycle is +X number 6. recorded.

Then, the TOC data read in the first cycle is checked for errors, and the correct track number and absolute address are checked.
51 predetermined latitudes. Furthermore, the data read in the next second cycle is checked for errors, and the data that was not stored in the previous cycle is stored in the lead-in data memory 15. By repeating this process, all the 'l'OC data is stored in the lead-in data memory 15.

Therefore, for example, if all the read TOC data is determined to be correct in the first cycle and the second cycle and is recorded in the lead-in data memory 15, then from the third cycle onwards, TO of the cycle of
This eliminates the need to read C data.

Therefore, in the DAI caterpillar apparatus having the above-mentioned basic configuration, the features of the present invention will be explained below. In FIG. 6, the same parts as in FIG. 2 are marked with the same symbols and omitted, and only the different parts will be described here. That is, the output terminal of the switching circuit 150 is connected to one input terminal of another switching circuit 181.

The other input terminal of this switching circuit 181 is grounded via a DC power supply 182 with the polarity shown. Further, the output end of the switching circuit 18 is connected to the pickup feed motor 143.
It is connected to the.

On the other hand, the lead-in data memory 151 is
An output signal is supplied to the data read detection circuit 183 every time the absolute address of the C data and the respective absolute address is stored.

The data reading detection circuit 183 determines based on the output signal that all TOC data has been stored in the lead-in data memory 15, and outputs a detection signal to the pulse generation circuit 184. This pulse generating circuit 184 normally outputs an L level, and when a detection signal is output from the data reading detection circuit 183, it outputs an H level pulse for a fixed period of time. It is something. Here, when the output terminal of the noise generating circuit 184 is at L level, the switching circuit 181 switches between the switching circuit 150 and
When the output terminal of the i9 pulse generation circuit 184 is at H level, the output of the DC power supply 1 is guided to the pickup feed motor 143.
The output of 82 is switched to be guided to the pickup feed motor 143. Therefore, in the normal playback state and the above-mentioned search operation state, the outputs of the feed motor control circuit 149 and the level shaping circuit 166 are
1'/d- is supplied to the big ano transmission motor 142.

Here, as described above, with the pickup 142 at the P1 start position in the lead-in area of the disc 140, the disc 140 is loaded into the disc loading section 111 and the disc loading section 11 is closed. )ノe
+7- (powgtt) It is assumed that the key 113 is operated to start playback of the lead-in area, and for example, all the TOC data is stored in the lead-in data memory 15 in the second cycle. Then, the r-night reading detection circuit 183 outputs a detection signal, and the pulse generation circuit 18
The output terminal of No. 4 is set to H level.

Therefore, the output of the DC power supply 182 is supplied to the pickup feed motor 143 via the switching circuit 181. Then, the pickup feed motor 143
42 toward the outer circumference of the disk 140. For this reason, Big Ala F142 was left with 3
Jump into the lead-in area after the cycle and tear'
It is sequentially moved in the direction of the outer circumference of the drive 140', and
, to be reached within the area. And C1 above mother rus occurrence 1
! ”Route 1841. J. The time required for the pickup 142 to be sufficiently moved to the desired position in the program area is kept at 1 level. Therefore, when the pickup 142 sufficiently reaches the program area δ and the output of the pulse generation circuit 184 is returned to the L level, the pickup 142 is controlled by the output of the feed motor;
1 Read the absolute address of the program area in Arashi,
Recorded in the current address memory 153: 1. Ha δ.

On the other hand, the lead-in data memory 15 contains an absolute address 10 for the playback start position of the program area.
Once the data has been set, the absolute address that was read out and the absolute address of the start position of the zero program area and the distance printer are generated as described above. , the above-mentioned ν"-ch operation is performed, and the big ar f142
+ You will be moved to the playback start position of the log2 area,
The nologram area is reproduced.

Therefore, according to the above configuration, when the pickup 142 generates a lead-in area of 11'' and all of its TOC data is stored in the lead-in device 915, the pickup 142 is forced into the program area. Then, from that position, it was moved to the position of absolute address "0" by creating circle 9, so even after all the 'ruc data is stored in the lead-in data memory 15, the big ara f142 plays back the lead-in area. C1 quick and time advantageous without having to
L: A device that can perform accurate data capture.

Furthermore, if the keyboard unit 155 is configured to determine in advance B "desired track number and its relative address '1Ff2' and output the absolute address of the target position from the adder circuit 157, the pickup 142 can be programmed first. Generate distance data from the absolute address at the position forcibly moved within the area and the absolute address of the target position, and move the pickup 142 directly to the target position 14. Can also be done.

It should be noted that the present invention is not limited to the above-mentioned 7L/-) embodiment, but may be implemented in various other forms without departing from the spirit thereof.

〔Effect of the invention〕

Therefore, as detailed above, this invention provides
Especially discs containing digitized data (
1) In a disc record reproducing apparatus for recording, it is possible to provide a very good r-isf record reproducing apparatus that can perform rapid and accurate r-record reading with a simple configuration.

[Brief explanation of drawings]

FIG. 1 is a top view showing an overview of CD-based DAD playback to which the present invention is applied, FIG. 2 is a block diagram showing a basic overview of the electric circuit system of the DAD playback device, and FIG.
The figure is a block configuration diagram showing the pickup position detection circuit of the air circuit system, FIGS. 4(a) and (b) are waveform diagrams for explaining the operation of the pickup position detection circuit, and FIG. 5 is the same. 'A waveform diagram for explaining the kick/gurus of the nausea circuit system. FIG. 6 is a block diagram showing an embodiment of the disc record production device according to the present invention. 110... Cabinet, 111... Disk loading section, 112... Inno select key, 113... P work key, 114... Display, 115... Repeat key, 116... Fast forward key , 117・
...Graykey, 118...Next Greykey, 1
19...Repeat key, 120...Pause key, 1
2 No...Strag key, 122 to 131...Numeric key, 132...Memory read key, 133...Memory key, J34...Clear key, 140...Disk, 141...Disc motor , 142... Pickup, 143... Big ag feed simulator, 14
4... Focus control circuit, 145... Tracking control circuit, 146... Process circuit, 147...
Switch circuit, 148...Addition circuit, 149...Transmission, motor control circuit, 150...Switching circuit, 151.
...Lead-in data memory, 152...DA conversion circuit, 153...Current address memory, 1.54...
・, Output terminal, 155...Keyboard section, 156...
・Purpose address memory reno star, J57...addition ↓11
Circuit, 158... First position calculation circuit, 159...
Second position Ml' calculation circuit, 160... subtraction circuit, 16
ノ...Movement calculation counter, 162...Kick No. 4
pulse generation circuit, 163...subtraction circuit, 164...i
9 turns - number configuration circuit, 165... Numeric value converter, I (i6... Level shaping circuit, 167... Polarity inversion circuit, 168... Search switch, 169...
DC power supply, 170...5-RFF circuit, 171, 17
2... AND circuit, 173... Monostable multi-novelator, 174... AND circuit, 175... Pick-up position calculation circuit, 176.177... AND circuit, 178... Input terminal, 179 ...0 level converter, 180...output terminal, 18)...switching circuit, 182...DC power supply, 183...7''-evening reading i+v, D detection circuit, 184...no 9 pulse generation circuit.

Claims (1)

[Claims] For discs that have a lead-in area where table content/content data is repeatedly recorded on the inner side and a program area where digitized data is recorded on the outer side, move the optical pickup from the inner side to the outer side. In a disc record playback device that sequentially reads data in the lead-in area and the program area by moving the lead-in area, the disc record playback device includes a detection means for detecting that all the table-op content data in the lead-in area has been read out, and A moving means for forcibly moving the pickup to an arbitrary position within the program area in response to a detection signal output δ, and a search means for moving the picker f to a predetermined position within the program area. A disc record playback device characterized by: