JPS5963063A - Recording device using disk-like recording medium - Google Patents

Abstract

PURPOSE:To display at the time of recording whether a track pitch is positioned in a prescribed standard or not by detecting as a variation of frequency a relative moving speed in the diameter direction of a disk for controlling a track pitch on a disk and a disk of a signal converting means, and generating the voltage corresponding to this detected frequency. CONSTITUTION:On a moving base moved in the direction as indicated with an arrow 8, a disk 1 driven to rotate is constituted so that a recording locus of a pitch corresponding to a moving speed in the direction as indicated with the arrow 8 is drawn by a signal converting element. Frequency of a reference signal for controlling a rotation phase of a turntable motor for rotating the disk 1 can be represented by an equation [ I ]. Accordingly, a revolving speed NT of a turntable, namely, a disk becomes as an equation [II], and when a track pitch is denoted as P (mum: constant), a moving speed V of the moving base 1 becomes as an equation [III]. On the other hand, laser light 6 irradiated in parallel to the moving direction of a moving base 8 from an He-Ne laser 5 is reflected by a mirror 3 fixed to the moving base 1, and when light split by a beam splitter 4 is made incident to a detector 7, it becomes as an equation [IV] and a moving speed of the moving base 1 is converted to frequency.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotationally driven disc-shaped recording medium (disk).
The present invention relates to a recording device that sequentially records signals as spiral recording tracks using a signal conversion element, and detects and displays whether or not the pitch between the recording tracks is recorded within a predetermined tolerance range. It is.

Conventional Structure and Problems The track pitch of a disk is generally standardized as P±ΔP μm. Therefore, it is necessary to be very careful whether the track pitch is within the above-mentioned standard during recording, but conventionally there has been no means for displaying this kind of information.

OBJECTS OF THE INVENTION In order to solve this problem, the present invention is designed to display whether or not the track pitch is within a predetermined standard during recording.

Structure of the Invention The present invention fd detects the relative movement speed of the disk regulating the track pitch on the disk and the signal conversion means in the diametrical direction of the disk as a change in frequency, and creates a voltage according to the detected frequency, The purpose is to detect whether this voltage is within a predetermined range.

DESCRIPTION OF THE EMBODIMENTS The present invention will be described in detail below with reference to the drawings. In FIG. It is configured so that a recording locus with a pitch corresponding to the moving speed in the eight directions of the arrows is drawn by an element (not shown). Relative velocity (linear velocity) between the disk and the signal conversion element
In order to record using a recording method (CLV method) in which .times..times..times..times..times..times..times..times..times..times..times..times..times..times..times..times.

■. (m) is the relative speed between the disk and the signal conversion element (constant) 2M is the motor (disk) from the frequency generator
The number of pulses that occur in one revolution (constant).

R (mm) is the distance of the signal conversion element on the disk 2 from the center of the disk, as shown in FIG.

Therefore, the rotational speed N of the turntable, that is, the disk
T is obtained from equation (1), and if the track pitch is P (μm=constant), then the moving speed V of the movable platform 1 shown in FIG. 1 is as follows. On the other hand, reference numeral 5 in FIG.
The laser beam 6 irradiated parallel to the moving direction of the moving table 1 is reflected by the mirror 3 fixed to the moving table 1, and the reflected light causes feedback coupling of the He-Ne laser, and the beam split by the beam splitter 4 is When light enters the titictaph, the frequency of the output signal of the detafter 7 becomes f=#×−(+(,) ・ ・ ・ ・ (4) λ), and the moving speed of the moving table 1 is converted into a frequency. However, λ (μm) is the wavelength of the laser beam.

Sub-two c (1), (2), (3), (4
), the reference signal frequency F that controls the rotation of the disk of CLv and the frequency f to which the moving speed of the moving unit 1 is converted
There is a relationship between P (5) f-7X M X F.

When this signal with frequency f is input to the frequency-voltage conversion circuit 11 with gain K (V/Hz), the output voltage is P V = K x - x - x F...
...(6) λ M .

On the other hand, in order to determine whether the moving speed is within the range of track pitch P±ΔP (μm), C
From the LV reference signal (frequency F, Fig. 1, 9), the moving speed is P + ΔP (1, tm), P - ΔP (μm), and P - Δ
A signal corresponding to the output frequency of the ticktuff corresponding to P (μm) is produced. That is, from equation (5), 10 in Figure 1
And the frequency division ratio of the frequency divider circuit of 12 is 715 soJ↓ N1-□ ・・・・・・・・・・・・・・・・・・(7) 2×
(P+ΔP) λ×M λ×M 099, the output frequency of each frequency dividing circuit is the output frequency of the ticktuff corresponding to the moving speed when the track pitch is P+ΔP (71 m) and P−ΔP (μm). Match. Frequency-voltage conversion circuits 13 and 14 having the same gain as the frequency-voltage conversion circuit 11
When the input voltage is input to the frequency-voltage conversion circuit 1, the output voltage is
The output voltage of the frequency-voltage conversion circuit 14 is λ×M.

Therefore, the actual moving speed or track pitch P
If the speed corresponds to the range of 2 ΔP (μm), then (6
) is calculated using the formula V2≦■≦■1 ・・・・・・・・・・・・・・・(11),
Anything outside the range is v<v v>v ・ ・・・・・・・・・
- (12) 22 1 It can be determined whether the moving speed is within the range of track pitch P plus ΔP (μm).

Sweet ■, v1. ■If 2 is input to the wind comparator 15 shown in FIG.
When the speed corresponds to the range of P (μm), that is, v2 × v
When ≦■1 and when it is outside the range, that is, v〈■2 or ■〉■
1, the output state of the window comparator 15 is different, so this output signal (Fig. 1 16) is used to activate the buzzer and LE.
Driving deviation of D etc. can be determined visually or visually as an abnormality in the moving speed.

However, the track pitch P calculated using equations (7) and (8)
When the division ratios N1 and N2 corresponding to +ΔP (μm) and P-ΔP (lzm) are found using the actually used values, P±Δp=1.60±0, 1 μm, λ=0
．． 6328μm.

When M=105 N1:19.542 N2 mi 22.148 Therefore, it is impossible to obtain such a frequency division ratio.

Therefore, a multiplier is inserted to increase the frequency F of the CLV reference signal by 1000 times (the value in the embodiment). Therefore, the frequency division ratio is N1:1:19E542 N2'::22148. A configuration diagram in this case is shown in FIG. 2.

For sizes 1 to 16, it is similar to that shown in Figure 1, and is a 37 scale multiplier. However, the frequency dividing ratio of the frequency dividing circuits 10 and 12 in FIG. 2, which correspond to the frequency dividing circuits 10 and 12 in FIG. 1, is N1.
This is a change from N2 to the above-mentioned N-i and N-sai. In this way, by increasing the frequency dividing ratio of the frequency dividing circuits 10 and 12 by inserting the multiplier 37, the track pitch P+Δ
Frequency dividing circuit 1 to obtain the frequency corresponding to the moving speed equivalent to P (μm) (actual value is 1.600.1) 1 m)
The frequency division ratio of 0 and 12 can be selected thinly, and the frequency obtained by this operation is equal to the track pitch P±ΔP(μ
Since it is extremely close to the frequency corresponding to the moving speed corresponding to m), it is possible to accurately detect an abnormality in the moving speed.

Effects of the Invention As described above, in the signal recording device using C'LV, the CL
Detecting an abnormality in the moving speed of the recording medium, which moves at a speed proportional to the reference frequency of V, during recording is a great means for obtaining an overview of the quality regarding the pitch of the completed Tisph. Note that even in a signal recording device using CAV (constant angular velocity) recording, F, which corresponds to the CLV reference frequency, is kept constant, so the present invention can also be applied to CAV recording.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the basic configuration of one embodiment of the recording apparatus of the invention, and FIG. 2 is a block diagram showing another embodiment of the invention. 1...Moving table, 2...Tisfu, 3...
・Reflector, 4... Beam splitter, 5...
・Laser, 7...Detector, 10, 12...
・Frequency divider, 11, 13. . 14... Frequency-voltage converter, 15...
Window comparator, 37... multiplier.

Claims (3)

[Claims] (1) relatively moving a rotationally driven disc-shaped recording medium and a signal conversion element in the diametrical direction of the disc-shaped recording medium;
The signal conversion element is configured to sequentially record signals as a spiral recording trajectory on the disk-shaped recording medium, and obtains a detection signal of a frequency corresponding to the relative speed between the disk-shaped recording medium and the signal conversion element. , a first voltage according to the frequency of this detection signal is created, and the first voltage is between the upper and lower limit voltages corresponding to the upper and lower limit speeds of the predetermined relative speed, respectively. A recording device using a disk-shaped recording medium, characterized in that it is configured to detect and display whether or not there is a disk-shaped recording medium. (2) In order to set the upper limit voltage and lower limit voltage corresponding to the upper and lower limits of the relative speed, the reference signal for speed phase control of the motor for rotating the disc-shaped recording medium is set to the upper limit of the relative speed of the recording medium. The output signal is input to a frequency divider having a division ratio for obtaining a frequency corresponding to when the signal is moved at the lower limit, and the output signal is obtained by frequency-voltage conversion. A recording device using the disc-shaped recording medium according to item 1. (3) A recording/reproducing apparatus 0 using a disc-shaped recording medium according to claim 2, wherein the reference signal is multiplied and then inputted to a frequency divider.