JPS624794B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an information signal recording disk and its recording method, in which a burst signal of a frequency other than the main information signal band is recorded by selecting a recording length for each rotation of the disk, thereby picking up previously recorded signals. It is an object of the present invention to provide an information signal recording disk and its recording method, in which the transfer speed of a reproducing element for reproduction can be controlled by the same circuit regardless of the type of main information signal. The applicant has previously discovered that a main information signal is recorded in a spiral or concentric main track of an intermittent row of pits,
First and second tracking control reference signals (hereinafter referred to as "tracking signals") p ₁ and p ₂ having different single frequencies are provided approximately in the middle between the track center lines of adjacent main tracks, respectively. The signals are switched alternately every rotation period of the information signal recording disk.
Further, the sub-tracks of pit rows intermittent in a burst pattern are formed and recorded, and furthermore, the above-mentioned main information is stored at the switching connection portion of the tracking signals p ₁ and p ₂ for switching the tracking polarity of the tracking servo circuit. A third tracking signal p3 having a different frequency from both the first and second tracking signals _p1 and _p2 is applied to the above _- mentioned main track (or may be a sub-track) at a level below a predetermined level every rotation period. We proposed a capacitance change detection and readable information signal recording disk that has an electrode function. The reproduction needle for picking up and reproducing recorded signals from such information signal recording disks (hereinafter referred to as "discs") is tracking controlled based on the signals obtained by reproducing the respective tracking signals _p1 , _p2 , and _p3 . Therefore, no needle guide groove is formed on the surface of the disk. In addition, the disc proposed by the present applicant has a structure in which the playback needle is quickly advanced to the start position of the first recording program on the outer circumferential side of the start position of the first recording program on the same disc surface, thereby reducing the waiting time. In order to start playback, a signal called a lead-in signal is recorded.On the other hand, the playback needle is quickly moved to a standby position (armrest position, etc.) on the disk on the inner circumference from the end position of the last recording program. ) A so-called lead-out signal (or go-home signal) is recorded for the purpose of automatically returning to the beginning of the playback. Various address signals indicating the time from the first recording program start position on the disk are recorded. In order to automatically cue and reproduce the desired recording signal position on the disk, which is proposed by the present applicant, the various address signals mentioned above are differentially reproduced, and the reproduction needle is moved while comparing this with the target address number. By controlling the position, there are no technical problems.
And it can be done reliably. However, in order to carry out such an automatic cueing operation in consumer equipment, which has a particularly strong demand for low cost, there is also the problem of increasing the number of circuits such as decoding circuits for various address signals recorded on the disk. Furthermore, a disk (video disk) in which the main information signal recorded on the disk is a video signal.
and obtained by pulse code modulating the audio signal.
Disk when PCM signal (digital)
(audio disks), different address signal recording methods are used. This is because video discs need to be adapted to different television formats in different countries around the world, whereas digital audio discs are universal. An address signal is recorded during a predetermined period within the vertical blanking period of a video signal recorded in 4 fields, and in the case of a digital audio disk, for example, the sampling frequency
The 47.25kHz PCM signal is recorded in 130 bits as one block in chronological order, but the address signal is recorded in chronological order in the last 130th bit of each block, and 126 bits are recorded in 126 blocks. All bits of the address signal are transmitted. For this reason, the video disc and digital audio disc proposed by the applicant are:
Both can use the playback stylus to play back recorded video signals or PCM signals using the same playback device by detecting changes in capacitance, but since the way address signals are recorded is different, automatic cue playback and playback stylus movement are required. There was a problem in that separate circuits were required to read out both address signals for control purposes. The present invention solves the above problems by using a burst signal having a frequency other than the main information signal band, such as the third tracking signal _P3.Each embodiment of the present invention will be described below with reference to the drawings. . Although the present invention can be applied to information signal recording disks other than the disk proposed by the present applicant, for convenience of explanation, the disk proposed by the present applicant will be described as an example. The role of the third tracking signal _p3 recorded on the disk proposed by the present applicant is to clarify the switching point between the tracking signals _p1 and _p2 . Therefore, if the point in time when the tracking signal _p3 changes from nothing to present is the point in time when the tracking signal _p3 is switched, the length of the recording section of the tracking signal _p3 does not matter. Each of the embodiments described below focuses on this point, and records the tracking signal _p3 on the disk by providing several stages in the recording section, and the playback device identifies the length of the recording section. This is to control the movement of the playback needle and perform automatic cue playback and the like. In addition, the detection circuit for the tracking signal _p3 , that is, the tuning circuit whose resonant frequency is the frequency of the tracking signal _p3 , and the detection circuit that generates an output according to the envelope of the signal are used for playback of video discs, digital audio discs, etc. Sometimes it is necessary and is provided within the playback device. Therefore, the p ₃ detection circuit can commonly use a circuit for tracking operation. FIG. 1 is a partially cut-away plan view showing the signal recording arrangement relationship of an embodiment _of the disk according to the present invention, and FIG. The relationship with length is schematically shown. In FIG. 1, the shaded area indicates the main information signal recording area, and the satin-finished area indicates the third tracking signal _p3 recording area. To explain this in more detail, on the disk 1 of this embodiment which is rotated at 900 rpm, the third tracking signal _p3 is recorded at a recording angle of 27 degrees centered on the disk center hole 1a for one rotation from the outer circumferential side. (time for one rotation 5 x 10 ^-3 seconds) and approximately 2250 rotations period (approximately 2
Recording part A recorded over a period of 30 minutes (minutes 30 seconds), recording angle 9 degrees per revolution (time per revolution 1.66 x 10 ^-3 seconds)
The recording part B ₁ was recorded over a period of approximately 30 rotations (approximately 2 seconds) at a recording angle of 3° for one rotation (time for one rotation approximately 5.55 x 10 ^-4 seconds) and for approximately 450 rotations (approximately 30
A recording portion C ₁ recorded over a period of 2 seconds) is recorded. Here, the recorded portion A is a _p3 recorded portion used as a lead-in signal as described later, and the recorded portion _B1 is from approximately 3 seconds before to approximately 1 second before the recording start position of the first recording program #1. _C1 is a recorded portion recorded in a range from about 1 second before to about 30 seconds after the recording start position of program #1. Also, _B2 is a recording part where the third tracking signal _p3 has the same length as _B1 and is recorded before the second recording program #2 for the same purpose as _B1 , and _C2 is also recorded.
This is a _p3 recording portion recorded immediately before or at the beginning of the second recording program #2 with the same purpose and recording length as _C1 . Furthermore, at positions on the disk other than those mentioned above, a third tracking signal is sent every one rotation period of the disk at a recording angle of 1° as shown by D ₁ , D ₂ , ..., _Do.
p ₃ is recorded. Furthermore, as shown by E from the position immediately after the n-th program #n, which is the final recording program, the recording angle for one rotation is 81° (time for one rotation is 15 × 10 ^-3 seconds) for about 2700 rotations ( Approximately 3
The recorded portion in which the tracking signal _p3 is recorded over a period of 1 minute) is used as a lead-out signal, as will be described later. Third tracking signal p ₃ shown in satin above
As can be seen from Figure ₁ , the recorded portions have different recording lengths, but the initial positions of the recording portions formed for each rotation are aligned in the radial direction of the disk 1. , Therefore, when this is reproduced, the repetition frequency of the tracking signal _p3 is constant and equal to the reciprocal of one rotation period of the disk 1, and only its duration differs depending on the recording length. The relationship between the tracking signal _p3 recorded on the disk 1 shown in FIG. 1 and each recording length of the recording program is schematically shown in FIG. 2. Note that the time on the horizontal axis indicates normal playback time. In addition, the recording location of the recording tracking signal _p3 of the disk of this embodiment shown in FIGS. 1 and 2, and 1
The following table summarizes the playback time and recording angle for each rotation.

[Table] Here, the recording length portion B that informs the program from 3 seconds before to 1 second before the start of the program is set to a recording angle of 9 degrees, and the recording length portion C that informs the program from 1 second before to 30 seconds after the start of the program is set to a recording angle of 3 degrees. The recording angle was chosen for the following reasons. Disk 1 rotates at 15 rps, but I want the time accuracy for cueing to be about 2 seconds ± 1 second at most. In this case, the above recorded part B is for one rotation.
It is played back in bursts for a total of about 2 seconds at 1.66 x 10 ^-3 seconds, but if this recorded part B is searched for in one disk rotation during a high-speed search, it will be played back in a burst of 15 (rotations) x 2 (seconds) for a high-speed search of 1 second. )=30 (seconds) can only be investigated. Therefore, if 60 minutes of main information signals are recorded on one side of disk 1, it will take 2 minutes for all the high-speed searches of the recorded portion B, and therefore the reproducing element such as the reproducing needle will not be able to reach the outer periphery of the disk. Inner circumference (or outer circumference) when it is on the side (or inner circumference side)
It is inconvenient because it takes a long time of 2 minutes to find the program. Therefore, by recording a 30-second recording portion C from 1 second before the start of the program at a recording angle of 3 degrees, it is possible to perform a high-speed search over an area of 30 seconds per disk revolution, or 7.5 minutes per second. The entire surface of the disk can be searched in a short time of about 8 seconds. Furthermore, since the recording signal of the recording portion E used as the lead-out signal is for forcing the reproducing element such as the reproducing needle to automatically return to the standby position, malfunctions such as dropouts must not occur.
Therefore, recorded portion E is different from other recorded portions A, B,
It is recorded for the longest time compared to C and D, and the recording angle is 81° as in this embodiment. Furthermore, in this embodiment, in order to detect five types of states, the recording angle of p ₃ was divided into five by 3 times 90 degrees, but the recorded portion A used as the lead-in signal was recorded for a relatively long time. Since it is preferable that the recording angle be 27 degrees, as mentioned above, the recording angle is selected to be the shortest, 1 degree, so as not to affect the main information signal as much as possible after 30 seconds after the start of the program. In this way,
The third tracking signal _p3 having a constant repetition period of one rotation period of the disk as shown in FIG.
Depending on the program of the main information signal on the disk 1, the duration thereof is varied and recorded. By the way, in the above embodiment, the recording portions indicated by B ₁ and C ₁ were provided before the recording of the first recording program #1. Since it can also be detected as the start position, as shown in _FIG .
The entire track may be recorded at 27°. Next, to explain the second embodiment of the disk according to the present invention, FIG. 4 schematically shows the relationship between the recording tracking signal _p3 and each recording length of the recording program in the second embodiment of the disk according to the present invention. Shown below. In the figure, F is the recording part of the tracking signal _p3 used as the lead-in signal, and the recording angle is 9° (or
27°) and is recorded on the outer circumference of the disk over a period of rotation of the disk, for example, about 2 minutes and 30 seconds.
n shown below as #1, #2, ..., #n in the inner circumferential direction
Species recording programs are recorded in chronological order. Also, at a predetermined position on the disk surface between the start position of recording program #1 and the end position of recording portion F, a tracking signal _p3 is applied every one rotation period of the disk at a recording angle of 1°, as shown by _H0 . recorded in bursts. Also, G ₁ ,
G ₂ , . . . start being recorded at the same time as each recording program #1, #2, . The recorded portion of the third tracking signal p ₃ is shown, and H ₁ ,
For example, H ₂ ,..., H _o is the disc 1 at a recording angle of 1°.
Third tracking signal recorded every rotation period
p ₃ shows the recorded part. Furthermore, like the recording portion E, this is a recording portion of the tracking signal _p3 used as a lead-out signal, and its recording angle is, for example, 27° (or 81°). This embodiment is different from the first embodiment or its modification, in that during the disk rotation period of about 20 seconds from the start of recording of each recording program, the recording portion G ₁ , . . . , G _o are provided, and there is no need to know in advance 3 seconds before the start of the recording program, so it is advantageous in that recording can be performed without the need to perform any processing on the master tape of the conventional recording system. As another example, the recording time per disk rotation of the _P3 recording part used as a lead-in signal is about 2.5 × 10 ^-3 seconds, and that of the _P3 recording part used as a lead-out signal is 14.16 seconds.
It may be approximately ×10 ^-3 seconds. Furthermore, the length of the recording portion for program cueing in the disk radial direction (disc rotation period) may be selected based on the balance between the number of programs to be recorded and the speed of the reproducing element during high-speed search. Next, an embodiment of the disk recording method according to the present invention will be described with reference to FIG. FIG. 5 shows a block system diagram of an embodiment of the recording method of the present invention. In the figure, 2 is a video signal (or a PCM signal pulse code modulated with an audio signal) which is the main information signal.
input terminals 3, 4 and 5 are lead-in position signals, signals related to program start, respectively;
and input terminals for the readout position signal.
The video signal (or PCM signal) to be recorded as the main information signal that has entered the input terminal 2 is supplied to the adder circuit 6, where it is added and synthesized with the third tracking signal _p3 from the gate circuit 9, which will be described later. be done. On the other hand, the high-frequency single-frequency signal extracted from the master oscillator 7 is supplied to the tracking signal generation circuit 8, where a single-frequency first signal having different frequencies near a frequency of 0.6 MHz, for example,
A tracking signal p ₁ and a second tracking signal p ₂ are generated and outputted in each horizontal scanning period and only during a period obtained by subtracting the color burst signal existence period from the horizontal blanking period, and at the same time, The first and second tracking signals _p1 and
A third tracking signal with a different frequency from p _2
p3 is generated and output for a predetermined period corresponding to the switching of _p1 and _p2 . Here, taking as an example the case of recording on the disc described below with reference to FIGS. 1 and 2, the duration of the third burst tracking signal _p3 extracted from the tracking signal generation circuit 8 is Period 15× corresponding to angle 81°
It is selected to be 10 ^-3 seconds and is applied to the gate circuit 9. When no input signal is applied to any of the input terminals 3, 4, and 5, the gate circuit 9 gate-outputs the tracking signal _p3 during a period corresponding to the recording angle of 1° and every one rotation period of the disk. and is applied to the adder circuit 6. Further, when the lead-in position signal is input to the input terminal 3, the gate circuit 9 gate-outputs the input tracking signal _p3 to the addition circuit 6 for a period of 5×10 ^-3 seconds corresponding to the recording angle of 27°. This lead-in position signal is transmitted every rotation period of the disc that is finally recorded, and
It lasts about 2 minutes and 30 seconds in total. Furthermore, when a signal enters the input terminal 4, the gate circuit 9 controls the input period (the recording period is 1.66×10 ^-3 seconds or 5.55×10 ^-4
seconds) tracking signal _p3 is gate-outputted, and when an input signal enters the input terminal 5 as a gate signal, the tracking signal _p3 is gate-outputted for the incoming period (the recording period 15×10 ^-3 seconds) ( In other words, the tracking signal _p3 from the tracking signal generation circuit 8 is passed through as is.) The input terminal 4 receives the video signal to be recorded (or
3 seconds before the start of recording of each program (PCM signal)
Until 1 second before, the gate circuit 9 is kept open for 1.66×10 ^-3 seconds during one disk rotation period, and from 1 second before the start of recording until 30 seconds have passed, the gate circuit 9 is kept open for 5.55× during one disk rotation period. An input signal for keeping the gate "open" for 10 ^-4 seconds is intermittently received every rotation period of the disk. In this way, from the adder circuit 6, the input terminal 2
A composite signal obtained by superimposing the third tracking signal p ₃ from the gate circuit 9 at a level below a predetermined level on the input video signal (or PCM signal) is extracted and supplied to the modulator 10 . Modulator 1
0 frequency-modulates one carrier wave with the composite signal from the adder circuit 6 (if a video signal is input to the input signal 2, for example, two types of audio frequency modulation waves are also supplied from an input terminal not shown). The frequency modulated wave thus obtained is transmitted to an optical modulator 17, which will be described later.
supply to Further, the tone burst-shaped first and second tracking signals p ₁ and p ₂ taken out from the tracking signal generation circuit 8 are alternately circulated by the switching circuit 11 every one rotation period of the disc-shaped recording master 24, which will be described later. The signal is switched to the light quantity control signal generation circuit 12 and the optical modulator 18, respectively. Next, to explain the optical system of the recording method, in FIG. 5, 13 is a laser light source, and the laser beam emitted from this is changed in its optical path by a reflecting mirror 14, and then passes through an optical modulator 15 for adjusting the light amount. , a portion is reflected by the half mirror 16 and supplied to the optical modulator 17, and at the same time, the remainder is transmitted and supplied to the optical modulator 18. As a result, the first modulated light beam modulated by the frequency modulated wave from the modulator 10 is output from the optical modulator 17, and the first or second tracking light beam from the switching circuit 11 is output from the optical modulator 18. A second modulated light beam modulated with the signal p ₁ or p ₂ is output. The first modulated light beam is reflected by the reflecting mirror 20 and enters the polarizing prism 21, where the plane of polarization is 90° with respect to the second modulated light beam which is reflected by the reflecting mirror 19 and made to enter the polarizing prism 21. It is shifted by ゜. The first and second modulated light beams from the polarizing prism 21 are each reflected by a reflecting mirror 22 and then incident on an objective lens 23, whereby they are projected onto a disc-shaped recording master 24 made of glass or the like which is rotating synchronously. The light is focused and focused on the photosensitizer coated on the surface. In this case, the first and second modulated light beams are each focused to be approximately 1/2 track pitch apart from each other. The recording master disc 24 is placed on a turntable 25, and is rotated by a motor 26 at a rotation speed of, for example, 900 rpm, and the recording master disc 24, turntable 25, and motor 26 are all moved by a transfer mechanism (not shown) along the arrow X. direction at a predetermined pitch. Therefore, a spiral main track and sub-track are formed on the recording master disc 24 by the first and second modulated light beams from the outer circumference to the inner circumference, and the main information signal is continuously recorded. and second tracking signals p ₁ and p ₂ are recorded in burst form, and furthermore, a third tracking signal p ₃ is recorded as the first tracking signal p 1 and p 2 .
As shown in the figure, data is recorded on the main track in a burst manner with a predetermined length related to the recording position of the recording program. In addition, as the recording master 24 and turntable 25 are moved in the direction of the arrow X, a displacement position detector 27 consisting of a potentiometer detects a direction (radial direction) orthogonal to the longitudinal direction of the track on the recording master 24 caused by the movement. The upper displacement position is detected and the DC voltage corresponding to the detected position is extracted.
This DC voltage is applied to the light amount adjusting optical modulator 15 via the DC amplifier 28, and is applied to the laser light source 1.
The light intensity of the laser beam from 3 is measured from the recording master 2.
Recording master 24 with a light beam spot focused on 4
Control according to the upper radial position. This compensates for the influence of the difference in relative linear velocity of the first and second modulated light beams depending on the radial position of the recording master 24. The light amount control signal generation circuit 12 is configured to control the existence period of the tracking signals p ₁ and p ₂ (in this embodiment, the main information signal is a video signal, and the information signal recording disk proposed by the present applicant usually has an adverse effect on the screen). In order to prevent this from occurring, a period corresponding to the horizontal blanking period that avoids the color burst signal period is made to exist, so in consideration of compatibility with this, a horizontal blanking period that avoids the color burst signal period is created. A control signal is generated to weaken the light intensity of the laser beam from the laser light source 13 only during the period corresponding to 1) compared to other periods, and is supplied to the optical modulator 15 for adjusting the light amount. As a result, the light intensity of the light beam passing through the optical modulator 15 during the period corresponding to the existence period of the tracking signal is weaker than the light intensity during other periods, so that only the first modulated light beam is recorded. The pit depth of the main track when the first and second modulated light beams are simultaneously irradiated onto the recording master 24, compared to the pit depth of the main track when the main track is irradiated and formed on the master 24. It is possible to prevent the phenomenon that the depth becomes deeper due to unnecessary light such as scattering and reflection, and recording is performed in a uniform state as a whole. The recording master disc 24 exposed as described above is subjected to a well-known development process, and a recorded disc of the present invention is obtained through a well-known disc making process. This recorded disk is made of a conductive material such as polyvinyl chloride (PVC) mixed with carbon, and has the above-described spiral series of intermittent pits formed thereon. Note that the third tracking signal _p3 may be recorded on a sub-track. Next, a playback device for playing back a disc according to the present invention will be explained. FIG. 6 shows a block diagram of an example of a disc playback device. In the figure, reference numeral 29 denotes the disk according to the present invention, which is placed on the turntable 30 and rotated synchronously with the turntable 30 by a motor 45 at, for example, 900 rpm, and a regeneration needle 31 having an electrode runs over its surface. Forced to slide. As a result, the capacitance formed between the electrode of the regeneration needle 31 and the disk 29 is
A well-known pickup circuit (not shown) converts the frequency to a high frequency by utilizing the change in response to the intermittent pits of the disk 29, and this high frequency reproduction signal passes through a preamplifier 32 to a demodulation circuit 3.
3. Bandwidth filters 34, 35 and _p3 detector 36
are supplied respectively. The demodulation circuit 33 is connected to the disk 29
The main information signal recorded on the main track of is demodulated and output to the output terminal 37. On the other hand, the tracking signals p ₁ and p ₂ are frequency-selected by band filters 34 and 35, respectively, and are supplied to a tracking servo circuit 39. Also
The p ₃ detector 36 receives the third tracking signal.
Envelope detection output of the tracking signal p ₃ which is generated by selecting the frequency of p ₃ from the high frequency reproduction signal, and even if the frequency cannot be selected due to dropout etc., and which is reproduced every rotation period of the disk 29.
Get FP ₃ . The output detection signal of this _p3 detector 36
FP ₃ is supplied to a switching pulse generator 38, which generates a switching pulse in synchronization with its rising edge. During normal playback, this switching pulse alternately switches to a high level or a low level every rotation period of the disk 29, and
Retained. This switching pulse is applied to the tracking servo circuit 39 to switch the tracking polarity. This is because the tracking signal on the outer circumference side and the tracking signal on the inner circumference side of the main track to be reproduced are switched each time the disk 29 rotates once. Although the duration of the tracking signal _p3 is different, its repetition period is always constant during one rotation of the disk as shown in FIG. 1, so the rise of the output of the _p3 detector 36 is also always constant. It is clear that it is a cycle. The tracking servo circuit 39 differentially amplifies the detection outputs of the reproduced tracking signals p ₁ and p ₂ to generate a tracking error signal, and applies this tracking error signal to the tracking coil 40 to move the reproduction needle 31 to the disk. The regenerating needle 31 is displaced in the radial direction of the main track 29 in a direction and displacement amount that corrects the track deviation, so that the tip of the regenerating needle 31 always slides on the main track. Incidentally, reference numeral 46 is a force terminal for a pulse that comes in synchronized with a pulse for changing the track when the reproducing needle 31 changes the track during special reproduction. By the way, the output detection signal FP ₃ of the p ₃ detector 36
is supplied to the p ₃ length detection circuit 41, where the duration (burst length) of the reproduced p ₃ detection signal FP ₃ during one rotation of the disk is detected.
The _p3 length detection circuit ₄₁ has a configuration, _for example _, as _shown in FIG. It consists of a logic circuit 49 provided on the output side. As a result, when reproducing the disks shown in FIGS. 1 and 2, for example, the recorded portion recorded at a recording angle of 1° is
When the detection output of the tracking signal p ₃ reproduced from D ₁ to _{D o} comes in, the integration circuit 48 ₁ to 4
8. All outputs of ₄ are connected to the Schmitt trigger circuit 48.
₁ to ₄₈₄ is not exceeded, and as a result, the logic circuit 49 outputs a signal to the output terminal 50 to set the playback needle 31 at the transport speed during normal playback (for example, the speed at which it moves 1 track pitch in 32 rotations). be done. Similarly, the recorded portions B ₁ , B ₂ ,
..., when the detection output of the reproduction tracking signal p ₃ from B _o is input, only the output of the integrating circuit 47 ₁ exceeds the threshold level of the limit trigger circuit 48 ₁ , and the reproduction tracking signal p ₃ of C ₁ to C _o
When the detection output of P3 from the recorded portion A is input, both outputs of the integrating circuits ₄₇₁ and ₄₇₂ exceed the threshold level of the Schmitt trigger circuits ₄₈₁ and ₄₈₂ , and when the detection output of the reproduction tracking signal _p3 from the recording section A is input. When each output of the integrating circuits 47 ₁ to 47 ₃ exceeds each threshold level of the Schmitt trigger circuits 48 ₁ to 48 ₃ , and when the detection output of the reproduction tracking signal p ₃ from the recording portion E is input, Since the duration of the detection output is the longest, for example, 15×10 ^-3 seconds, the configuration is such that all outputs of the integration circuits 47 ₁ to 47 ₄ exceed the respective threshold levels of the Schmitt trigger circuits 48 ₁ to 48 ₄ . ing. The logic circuit 49 is a Schmitt trigger circuit 48 ₁ ←
A predetermined signal is outputted to the output terminal 50 from each output level state of ₄₈₄ . The output signal at output terminal 50 is applied to control circuit 42 shown in FIG. The control circuit 42 is composed of, for example, a microcomputer, and sends level and polarity signals corresponding to the detection signal from the _p3 length detection circuit 41 or the control signal from the input terminal 43 to the feed mechanism 44.
A DC voltage is applied to the feed feed DC motor (feed motor) inside to perform predetermined feed feed control. That is, the regeneration needle 31 is connected to the feed feed mechanism 44.
The needle is transferred in the outer circumferential direction or inner circumferential direction along the radial direction of the disk 29 together with a pick-up device (not shown) such as a regenerating needle holding device (so-called feed feeding), but the transfer direction and speed are controlled by the feed motor (see FIG. (not shown) is determined by the polarity and level of the feed pulse from the control circuit 42. This feed operation will be explained in more detail. Based on the regeneration start command, the regeneration needle 31 is moved from the standby position toward the inner circumference of the disk 29 while moving away from it, and is slid onto the disk 29 near the outermost circumference of the disk 29 . Here, the position at which the disk 29 and the playback needle 31 first slide depends on the mechanical positioning accuracy of the playback needle 31 and variations in the first program start position due to the eccentricity of the disk 29, etc. In order to prevent so-called truncated playback in which playback starts in the middle of the program, it is necessary to lower the playback needle 31 to the outer circumference side rather than the first program start position.
However, if the playback needle 31 is lowered too far to the outer circumference, it will take time to start playing the first program, so control is required to quickly move the playback needle 31 from the time the lead-in signal is detected to the first program start position. becomes. That is, when the reproduction needle 31 reproduces the recorded portion A (or A' or F) after starting reproduction, the length of the duration is detected by the _p3 length detection circuit 41, and the control circuit 42 detects the duration based on this detection output. The generated feed pulse causes the feed feeding mechanism 4 to
4 moves the regeneration needle 31 to the inner circumferential side of the disk while sliding the regeneration needle 31 on the disk 29 at a relatively high speed (medium speed). As a result, the regenerated needle 31
is the recorded portion C ₁ (or in the case of Fig. 3
D ₁ , H ₀ in the case of FIG. 4), the control circuit 42 moves the regeneration needle 31 toward the outer circumference of the disk at a speed slower than the medium speed, based on the detection output of the p ₃ length detection circuit 41. A feed pulse is generated to move the playback needle 31, and when the playback needle 31 has played back the recorded portion B ₁ (or A', F), the playback needle 31 is moved into the disk again at a speed slower than in any of the above cases during normal playback. Generates a feed valve to be transferred to the circumferential side. Note that when the recording portion _B1 is reproduced when the reproducing needle 31 is moved toward the inner circumferential side of the disk at a medium speed, a feed pulse is generated to move the reproducing needle 31 toward the inner circumferential side of the disk at the transfer speed during normal reproduction. In this way, the lead-in operation can be performed accurately. When the reproduction of the final program is completed, the reproduction needle 31 reproduces the tracking signal _p3 recorded in the recorded portion E (or), and the _p3 length detection circuit 41 detects its length. As a result, the control circuit 42 controls the feed feeding mechanism 44 by generating a feed pulse that automatically returns the reproduction needle 31 to the original standby position at high speed after separating it from the disk 29. Next, the automatic cueing operation will be explained. For example, if it is desired to reproduce the next second program from the first position during reproduction of the first program, a command signal to that effect is applied to the control circuit 42 from the input terminal 43. As a result, the control circuit 42 moves the reproduction needle 31 toward the inner circumference of the disk at a medium speed, and
When playing back _B2 , the playback needle 31 is moved in the direction of the inner circumference of the disc at the normal playback speed, and on the other hand, when playing back recorded portion _C2 , the duration of the playback tracking signal _p3 is detected. After that, the playback needle 31 is moved toward the outer circumference of the disk at a speed slightly slower than the above-mentioned medium speed to read the recorded portion.
At the time when the duration of the reproduction tracking signal _p3 of _B2 is detected, the feed feed mechanism 44 is controlled to transport the reproduction needle 31 toward the inner circumference of the disk at the above-mentioned transport speed during normal reproduction. In addition, in order to start playback from the start position of the eighth program during playback of the first program, for example, seven pulses are applied to the input terminal 43, and the control circuit 4
2, the reproducing needle 311 moves toward the inner circumference of the disk at high speed while reading the recorded portions B ₂ to B ₇ or C ₂ to C ₇
After reproducing B ₈ or C ₈ , a feed pulse is generated to control the movement in the same way as in the above-mentioned cue reproduction. This allows automatic cue playback of the eighth program. Note that when performing automatic cue playback of a program on the outer circumference side of the program being played, the process is the same as the above cue playback, except that the moving direction of the playback needle 31 is different from the above cue playback. Automatic cue playback is possible. Further, the configuration of the p ₃ length detection circuit 41 is not limited to that shown in FIG. 7, and the length of the reproduction duration of the tracking signal p ₃ may be detected using a microcomputer. Other variations are also possible. Note that the signal with a constant repetition period recorded on the disk with a selected recording length is
The tracking signal _p3 is not limited to this, and this signal must be a burst signal. Further, the tracks formed on the information signal recording disk may be concentric circles. Furthermore, if the data is recorded as changes in a series of intermittent pits on the surface of the disc, a light beam reproducing element may be used. sheet) may be used. As described above, the information signal recording disk according to the present invention has frequencies other than the frequency band of the main information signal in the recording section in which the main information signal is sequentially recorded for each of a plurality of programs and/or in the section other than the main information signal recording section. , and a burst-like signal with a constant repetition period is recorded, and the duration of the burst-like signal is at the position of each program of the main information signal and/or on the outer or inner side of the main information signal recording section. Since different lengths are selected and recorded depending on the side position, it is possible to control the movement of the playback element according to the playback position during playback. It is possible to quickly advance to the desired position and automatically return after the last program has been played, and since the above-mentioned burst signal has a constant repetition period regardless of whether the main information signal is a video signal or an audio signal, digital The discrimination circuit in an audio disc or video disc playback device can be shared, and when the repetition period of the third tracking signal is used for other purposes such as switching the tracking polarity of the tracking servo circuit. is particularly suitable because it can expand the usage range of the burst signal, and by selecting the duration of the burst signal to be shorter in the main information signal recording section than in the main information signal non-recording section,
The reproduction position can be identified without adversely affecting the main information signal. Further, the recording method of the information signal recording disk according to the present invention includes a main information signal generation source, a burst signal generation circuit that generates a burst signal with a constant repetition period outside the main information signal band, and a burst signal generation circuit. gate circuit means for controlling the gate output so that the duration of the burst-like signal of the main information signal is recorded at different lengths corresponding to the recording period and/or the non-recording period of each program of the main information signal; , a burst signal from a gate circuit means and a recording means for recording on a disc-shaped information recording medium using a modulated beam or a modulated signal modulated with the main information signal, respectively, so the transmission characteristics of the main information signal system are An information signal recording disk in which a burst signal is generated at a constant repetition period while maintaining a good signal, and only the duration of the burst signal is varied depending on the position of the main information signal recording program and the main information signal non-recording section of the disk. It has features such as being able to create records.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway plan view showing the signal recording arrangement relationship of an embodiment of the information signal recording disk according to the present invention;
2 is a diagram schematically showing the relationship between the recording length of the tracking signal p ₃ in FIG. 1 and the radial length of the recording program, and FIG. 3 is a diagram schematically showing the relationship between the recording length of the tracking signal p ₃ in FIG. FIG. 4 is a diagram schematically showing the relationship between the recording length and the length of the recording program in the radial direction. _FIG . A diagram schematically showing the relationship with the length in the radial direction, FIG. 5 is a block system diagram showing an embodiment of the recording method of the information signal recording disk according to the present invention, and FIG. 6 is a diagram showing the information signal recording disk according to the present invention. A block system diagram showing an example of an information signal recording disc reproducing apparatus capable of reproducing a recording disc, FIG. 7 is a block system diagram showing an example of the main part of FIG. 6, and FIG. 8 shows a tracking signal.
FIG. 3 is a diagram showing an example of a signal waveform of p ₃ . 1, 29... Information signal recording disk (disk), 2
...Main information signal input terminal, 6...Addition circuit, 8...Tracking signal generation circuit, 9...Gate circuit, 13
...Laser light source, 21...Polarizing prism, 23...Objective lens, 24...Disc-shaped recording master, 31...Reproducing needle.

Claims (1)

[Scope of Claims] 1. A recording section in which the main information signal is sequentially recorded for each of a plurality of programs and/or a section other than the main information signal recording section at a frequency other than the frequency band of the main information signal and at a constant frequency. A burst-like signal with a repeating period is recorded, and the duration of the burst-like signal is determined by the position of each program of the main information signal and/or the outer circumference side or inner circumference side other than the main information signal recording section. An information signal recording disk characterized in that the information signal is recorded at different lengths depending on the position. 2. The duration of the burst-like signal recorded in the main information signal non-recording section on the outer circumferential side from the recording start position of the first program of the main information signal is the duration of the burst-like signal recorded in the main information signal recording section. 2. The information signal recording disk according to claim 1, wherein the duration of the information signal is selected to be relatively longer than the duration of the signal. 3. Among the burst signals recorded in the main information signal recording section, each duration of the burst signals recorded in a certain rotation period from at least the vicinity of each start position of each program of the main information signal, 3. The information signal recording disk according to claim 1, wherein the information signal recording disk is selected to be relatively long compared to each duration of the burst-like signal recorded after the certain rotation period. 4. The duration of the burst signal recorded in the main information signal non-recording section on the inner side of the recording end position of the final program of the main information signal from the recording start position of the first program of the main information signal. Any one of claims 1 to 3, characterized in that the duration is selected to be relatively longer than the duration of the burst-like signal recorded in the main information signal non-recording section on the outer circumference side. Information signal recording disk described in Section 1. 5. A main information signal generation source, a burst signal generation circuit that generates a burst signal at a frequency other than the frequency band of the main information signal and with a constant repetition period, and a burst signal generated by the burst signal generation circuit. gate circuit means for controlling the gate output period so that the duration of the signal is recorded at different lengths corresponding to the period during which each program of the main information signal is recorded and/or the period during which it is not recorded; An information signal recording disc characterized by comprising a recording means for recording on a disc-shaped recording medium using a burst signal from a gate circuit means and a modulated beam or modulated signal respectively modulated by the main information signal. Recording method.