JPS61986A - Recording and reproducing device of disc-shaped recording medium - Google Patents

Abstract

PURPOSE:To obtain a recording and reproducing device of disc-shaped recording mediums which reduces the phase difference between a reference signal and a reproduced signal, and records and reproduces excellently signals on discs where V marks do not exist, by comparing an address signal reproduced and extracted from the disc with a rotation reference signal to control the rotation of the disc. CONSTITUTION:The output of a signal detector of a pickup device 17 passes a band pass filter 22 and a waveform shaping circuit 23, and the address signal is pulsed. The first monostable multivibrator 25 to which this pulsed address signal is supplied detects one leading edge of the address signal which is detected twice for one rotation. The second monostable multivibrator 26 adjusts the output of the first monostable multivibrator 25 to such pulse width that the phase comparing capacity of a phase comparing circuit 16 is good, and this adjusted signal has the phase compared with the phase of the reference signal by the phase comparing circuit 16, and the output of the circuit 16 is synthesized with a speed control signal by an adder 11 to control the rotation of a disc motor 8. Thus, the disc motor 8 is rotated synchronously with the phase of the reference signal.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention relates to a disc-shaped recording medium (hereinafter referred to as a "disc") that records and reproduces video information, audio information, or coded information on a disc-shaped recording medium (hereinafter referred to as a "disk"). The present invention relates to a recording/reproducing device.

Conventional Structures and Problems Many devices have been proposed that use disks to record and reproduce information in a high-density manner using lasers, etc., as typified by video disks and document files.

Conventionally, rotation control for devices using disks capable of recording and reproducing is performed using signals from a rotation detector installed at the disk rotation site, or by using a signal from a rotation detector installed at the disk rotation site, This was done by comparing a rotation synchronization mark signal (hereinafter referred to as the [■ mark]) recorded in advance on the µ quasi-shin bow as a rotation speed and phase control signal.

This conventional device will be explained with reference to FIGS. 1 and 2. Figure 1 is an explanatory diagram of a disc that can be recorded and played back. 1 is the center hole for attaching the disc to the motor, 2 is the ■ mark area, 3 is the recording area, 4 is the ■ mark, and 5 and 6 are This is an address signal section. In recording area 3, empty tracks called pre-groups are arranged in advance at a pitch of 1.5 to 1.5 to simplify the feeding mechanism of the device and ensure good recording and playback even when the disc is eccentric.
2.5μ? It is recorded as a spiral or concentric groove structure of 1L, depth 0.08ttm, v1 degree. In addition, ■ mark 4 is the one in which the empty track is intermittently recorded in the ■ mark area 2, and a groove is formed in the ■ mark 4 portion, and a pulse for rotation synchronization can be detected as a change in reflectance. can. In Fig. 1, the dashed line C indicates the center line of the disc based on the edge of mark 4, and the solid line a and the broken line indicate the locus of a single point that serves as the reference for the recorded signal, for example, vertical synchronization in the case of a video signal. Indicates signal edges, etc.

FIG. 2 is a block diagram of the main parts of the apparatus for recording and reproducing the above-mentioned disc. The disc 7 is rotated by a disc motor 8. As shown in FIG. A rotation detector 9 outputs a frequency proportional to the number of rotations of the disk motor 8. Reference numeral 10 denotes a speed comparison circuit, which is composed of a frequency-voltage converter, a differential amplifier, and the like. 11 is an adder, and the speed comparison circuit 1
0 and the output of a phase comparison circuit 16, which will be described later, are combined and supplied to the drive circuit 12. This signal is power amplified by the drive circuit 12 and drives the disk motor 8 to rotate. 1
3 is a ■mark detector, which uses a reflective photocoupler made of a light emitting diode and a phototransistor, and converts the change in reflectance of the ■mark 4 into an electrical signal, detecting a signal once per rotation. pulses are detected from the disk 7. A waveform shaping circuit 14 adjusts the amplitude and pulse width of the detected V-mer 94. Reference numeral 15 denotes a reference generation circuit, which is composed of a crystal oscillator and a frequency divider. NTS
In the case of a C format video signal, a pulse of approximately 301-1z is output, inputted to the phase comparison circuit 16, where the phase is compared with the pulse of mark 4, a rotational phase error is detected, and the pulse is sent to the adder 11. Supplied. Thereby, the phase of the output of the reference generation circuit 15 and the V mark 4 can be kept constant. 11 is a pickup IN, which is used to detect (CI) from the disk 7 and record information on the disk 7, and is composed of optical parts and a servo mechanism. The pickup device 11 can move half the disk (in the A direction) by using one of the two tabs.

When the disk 7 shown in FIG. 1 is transferred to the apparatus shown in FIG. There was a problem in that the phase of the received signal, the phase of the dress signal, and the phase of the center line indicated by line C were slightly shifted. This is because the center line along which the pickup device 17 moves in the radial direction is deviated from the center line of the disk 7 indicated by the point a line C. This is caused by an error in parallelism adjustment of the pickup device 11, but for example, In order to suppress the phase difference between the base tII Buddha signal and the raw vertical synchronization signal to 1 μsac p -1), the parallelism adjustment (the angle between the solid line a and the broken line in Figure 1) should be adjusted to 0. It is very difficult to suppress the value to 01degP-P or less.Therefore, there is a drawback that a large error occurs when performing screen synchronization with other devices.

Furthermore, when recording or reproducing using a disc without V mark 4 as shown in Fig. 1, the rotational phase $
There was a drawback that 11111 was not applied.

OBJECT OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and provides a disc-shaped recording medium recording/reproducing device that can reduce the phase difference between the reference signal and the reproduced signal, and can perform good recording and reproduction even on disks without marks. The purpose is to provide

[Structure of the Invention] In order to achieve the second object, the disc-shaped recording medium recording/reproducing apparatus of the present invention has a recording guide track and an address signal for identifying the position of the recording guide track. A reproducible disk forest recording body J, an address signal extraction means for extracting the address signal from the reproduced signal, and rotation! 3 hits (generates No. 5) The Ruri quasi-generating circuit compares the address signal from the address signal extraction means with the rotary base simple signal 5J from the reference light 41 circuit, and based on the comparison result, the disc The configuration is such that it does not include a control means for controlling the rotation of the shaped recording medium.

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will now be described with reference to the drawings.

Figure 1.11 An embodiment of the present invention [Koriru 1 "Eye M"
This is a block diagram of the main parts of the recording medium recording and reproducing apparatus shown in FIG.
The number is 1. desk 7. Disc motor 8° rotation output Niji'r: 0 + Okimaro comparison] [I circuit 1 ()
, q adder 11, drive circuit 12, J rainbow single light 4t-circuit 1
5. The phase comparison circuit 16, the big j' knob 217, the feed screw 18, and the feed screw 19 constitute a speed control loop and a signal 4 detection mechanism from the disk 7. 7 is around the specified rotation speed (for example, 1
800ppm). This is the second
Shown in the figure? I It has the same configuration as the conventional device.

20 is a head an 1 which amplifies the signal detector output of the pickup device 17 and performs impedance conversion (
The signal is supplied to the demodulation circuit 21 and the bandpass filter 22. The band pass filter 22 removes the band I() of the address signal and improves the recording modulation No. 13 during recording and the separation between the playback signal and the address signal during playback. It is.

23 is a waveform shaping circuit which pulses the address signal. The address demodulation circuit 24 to which the - pulsed address signal is supplied detects the presence or absence of an address, □further reads the contents, and outputs the address information to a Ficron viewer, etc. It is also pulsed!, near address The signal is also supplied to the first monomulti 25, and the first monomulti 25 detects the edge of one side of the j'to1nos, which is detected twice in one rotation. The time constant of multi 25 1-1 and one revolution of disk 7 [time required 1N What is the relationship between 1
[lNn1'+'2TN. 26 is a second mono multi, which adjusts the output of the first mono multi 2:) to a pulse width that provides good phase comparison performance in the phase comparator circuit 16;
The phase of the C signal is compared with a reference signal in the phase comparison circuit 16, and combined with the speed control signal in the q accelerator 11 to control the rotation of the disk. With this configuration, the disk motor 8 rotates in phase synchronization with the base signal, and the locus of the reference point of the recorded signal, which is already shown in FIG. It can be maintained in a constant relationship with the center line of g1 isk 7 or the phase of the address.

Figure 4 is a diagram of each closed signal waveform of one circuit shown in Figure 453, where d is the waveform-shaped address signal, and e is the first monomulti 2
This output 0 is triggered at the first rising 15t edge of address signal d in 1d, and at the same time divides the address period by 1/2 and reduces the influence of noise components other than address signal d. Describe the movement. f is the output of the second monomulti 26, which is adjusted to have a good pulse width such as a lean pulling pulse.

FIG. 5 shows another embodiment of the present invention. 27 is a third monomulti, and is the same as the second monomulti 26 in FIG. 3. The same V# is used, and the address signal d is adjusted to a pulse width suitable for phase comparison. Reference numeral 28 denotes a fourth monomulti, which adjusts the V mark 4 detected from the disk 7 to an appropriate 4T pulse width, and then controls the fourth monomulti 28 by gate circuit W129.
Only the output of the third monomulti-27 whose phase matches that of the output is supplied to the switching circuit 30. , 31 is a retriggerable mono multi, and J Yuri 1 is placed near the address.
~Triggered, the address is detected (it is detected, the switching circuit 30 is controlled, and until the address is detected, the V mark 4 is used to detect the address, and then the address is detected.) The configuration is such that the rotation phase is controlled by using the rotational speed.

By configuring J, it is possible to avoid matching the phases of the reference signal and the recorded signal in each field of the video signal. For example, an odd-numbered no-yield vertical synchronizing signal is placed near the address in the same phase as V mark 4. , and vertical synchronization signals of even fields can be recorded in the vicinity of the address on the opposite side of the mark 4.

FIG. 6 shows the signal waveforms of each part of the circuit shown in FIG. h is the output of the third monomulti 27 triggered by the address signal rz;: i is the V mark detection pulse 1. which is the output of the waveform shaping circuit 14; ) is the output of the fourth monomulti 28 triggered by mark 4, which is a signal to be switched to mark 4 or address etch to provide a rotation control signal, and this controlled signal is a signal to be controlled by the switching circuit. 30 outputs.

Note that the same operation can be performed by using the address read end signal, which is one of the outputs of the address lJwA circuit 24, instead of the waveform-shaped address signal d.

Effects of the Invention - Lfa As described in 11, according to the present invention, the address signal and the rotation reference signal are compared and the result of the comparison is used to control the rotation of the disc-shaped recording medium. Therefore, by simply adding a simple circuit to the conventional circuit, the recording signal and the rotation reference signal from the reference generation circuit can be almost perfectly aligned in phase, and rotation synchronization signals such as V marks are pre-recorded. Even with a 4T disc, excellent rotational control can be achieved.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a disk, FIG. 2 is a block diagram of the main parts of a conventional disc-shaped recording medium recording and reproducing apparatus, and FIG. 3 is a diagram of a disc-shaped recording medium recording and reproducing apparatus according to an embodiment of the present invention. 4 is a block diagram of the main parts, FIG. 4 is a signal waveform diagram of each part of the circuit shown in FIG. 3, and FIG. 5 is a circuit of the main parts of a disk-shaped recording medium recording/reproducing apparatus according to another embodiment of the present invention. FIG. 6 is a waveform diagram of each part of the small circuit shown in FIG. 5. 7... Disc, 8... Disc motor, 9...
Rotation detector, 10...Speed device comparison circuit, 11...Additional device, 12...Drive circuit, 13...V mark detector, 14...Waveform shaping circuit, 115...Reference Generating circuit, 16... Phase comparator circuit, 17... Big Atsuno stomach loading, 18... Feed screw, 19... Feed motor, 20... Head no. 7 pump, 21... F! J.I.
ill path, 22...bandpass filter, 23...
・Waveform shaping circuit, 24...Ato, response VA circuit, 2
! 1... 1st monomulti, 2G... 2nd -[Nofurci, 21... 3rd monomulti, 28... 4th
Mono? Luci, 29...Goo 1~Circuit, 30...
Switching circuit, 31...S l-Regable monomer agent 6 j5., Hiroshi Figure 1 ゛Figure 2 Figure 3 (5)] Heater - - Figure S Figure

Claims (1)

[Scope of Claims] 1. From a playback signal played back from a recordable and playable disk-shaped recording medium that has a recording guide track and on which an address signal for identifying the position of the recording guide track is recorded, the address is an address signal extraction means for extracting a signal; a reference generation circuit for generating a rotation reference signal; and a comparison between the address signal from the address signal extraction means and the rotation reference signal from the reference generation circuit, and based on the comparison result. a control means for controlling rotation of the disk-shaped recording medium. 2. In addition to the recording guide track and the address signal, a disc-shaped recording medium is used in which a rotation synchronization mark is recorded at a specific position other than the information recording band, and until the address signal is detected, the rotation synchronization mark and the rotation synchronization mark are recorded. 2. The disk-shaped recording medium recording and reproducing apparatus according to claim 1, wherein the rotation of the cylindrical recording medium is controlled by comparing the rotation reference signal with a rotation reference signal.