JPH0346170A - Information recorder - Google Patents

Abstract

PURPOSE:To prevent the moving time of a track from being overlapped with the recording period of an information signal by prolonging the moving time to move a recording pickup rather than real time for the recording pickup to be moved in one concentric track. CONSTITUTION:A track pitch set by a track pitch setter 1 is converted to a pulse number Np by a pitch computing element 2 and outputted to a pulse generator 5. According to a track pitch P and a period Tr for the set rotating speed of a disk 11, it is calculated by a period computing element 3 which period in the rotating period of the disk 11 the time required for a recording pickup 9 to move one track is corresponding to. When the time of DELTAt is required from the stop of an output from the generator 5 to the stop of a pulse motor 8, such a period number B2 is expressed by a formula. Then, by raising decimals to a unit in the result of the formula, defining it as an integral number, calculat ing a rotating period number B3 required for moving the pickup 9 and setting a timing signal a', the track moving time of the pickup 9 is prevented from being overlapped with the recording period of the information signal.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an information recording device for recording information signals concentrically on a disc-shaped record carrier.

2. Description of the Related Art The above-mentioned conventional information recording apparatus will be explained based on the block diagram of FIG.

A disk-shaped record carrier (hereinafter referred to as a disk) 11 is rotated by a TT (turntable) motor 10 at a constant rotational speed, for example, HIOGrn, and an information signal is recorded by a recording pickup 9. Trackpi・y + Mt
The track pitch P of the disk 11 set by the pitch calculator 1 is converted into a pulse number N by the pitch calculator 2 and output to the pulse generator 5.

The pulse generator 5 generates Np pulses shown in FIG. 4(b) or (C) to the pulse motor at the timing when the output signal a of the timing generator 4 shown in FIG. 4(a) becomes high (H) level. Output to 8. The output signal a of the timing generator 4 is formed from the output of the TT reference generator 7, and the on/off time of the output signal a is an integral multiple (the fourth In figure (a), it becomes 1 times).

The pulse motor 8 moves the recording pickup 9 in the radial direction of the disk 11 by the number of input pulses NP.

Here, if the recording pickup 9 moves at a rate of A (μm/pulse), then N t "P/A (1), and the recording signal generator 6 moves at a rate of A (μm/pulse). Then, an information signal corresponding to one track is outputted to the recording pickup 9 during a period when the output signal a of the timing generator 4 is at a low (L) level (the time during which the disk 11 rotates once).

Here, the pulses output from the pulse generator 5 are shown in Fig. 4 (
As shown in b), all (N,
), the recording operation and moving operation of the recording pickup 9 are repeated without overlapping, so
Information signals are recorded concentrically on the disk 11.

Problems to be Solved by the Invention However, in the conventional configuration, when the track pitch P is set large, as shown in FIG. 4(C), the time for actually moving the recording pickup 9 (pulse output time) is 11 during which the information signal is recorded (Fig. 4(a)
) and time Δ
Only T1 may overlap. In this case, since the recording pickup 9 is moving in the radial direction of the disk 11 during the time ΔT1, the information signal recorded on the disk 11 becomes spiral only during this period, and there is a problem that it does not become a perfect concentric circle. Ta. To avoid this problem, set the track moving period (high (H) level period of output signal a) to be longer than the actual moving time of the recording gear 19 when the track pitch P is set to the maximum. , or when the set value of track pitch P is small, the fourth
0 time Δ where dead time of time ΔT2 shown in figure (b) occurs
When T2 is longer than the cycle of the set rotational speed, there is a problem in that dead time is generated every l track for at least one cycle of the set rotational speed, and the recording time becomes longer.

The present invention solves the above problems, and provides an information recording device that prevents the actual recording pickup movement time and recording period from overlapping, reduces wasted time when moving the recording pickup, and shortens the recording time. The purpose is to provide

Means for Solving the Problems In order to solve the above problems, the present invention provides a recording pickup that records information signals concentrically on a disc-shaped record carrier, and converts the set track pitch of the record carrier into the number of sending pulses. a pitch calculating means, calculating an average time for the recording pickup to move one track in the radial direction of the record carrier from the set track pitch, and converting this average time into a periodic number of the set rotation speed of the record carrier; and a period calculation means for outputting a period number with the decimal point rounded up to an integer value, and a timing of the movement period of the recording pickup is generated by multiplying the period number of the output of the period calculation means and the period of the set rotation speed. , a timing generator that generates the timing of the information signal recording period by the recording pickup according to a period of a set rotational speed; and a timing generator that generates the timing of the information signal recording period by the recording pickup according to the cycle of the set rotation speed, and a timing generator that generates the timing of the information signal recording period by the recording pickup, and a timing generator that generates the timing of the information signal recording period by the recording pickup, and a timing generator that generates the timing of the information signal recording period by the recording pickup, and a timing generator that generates the timing of the information signal recording period by the recording pickup. a pulse generator that generates a pulse to move the recording pickup in the radial direction of the record carrier; and a pulse generator that generates the information signal during an information signal recording period synchronized with the timing of the output of the timing generator and moves the recording pickup to the recording pickup. The recording signal generator is equipped with a recording signal generator for outputting a recording signal.

Operation With the above configuration, the number of cycles is calculated by the cycle calculation means from the set track pitch, and the timing of the movement period of the recording pickup is determined by multiplying this number of cycles by the set rotation - failure period, thereby moving the recording pickup. The recording pickup will not move due to the output of the pulse from the pulse generator exceeding the period, and the actual movement time of the recording pickup will not overlap with the information signal recording period.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a block diagram of an information recording apparatus showing an embodiment of the present invention. It should be noted that the same components as those of the conventional example shown in FIG.

The information recording device of the present invention has the conventional configuration shown in FIG. 3 by calculating the number of cycles for setting the on time (high (H) level period) of the timing signal a' generated by the timing generator 4'. A period calculator 3 which outputs to a timing generator 4' is added.

The number of cycles is calculated by calculating the average time for the recording pickup 9 to move one track on the disk 11 from the track pitch P (μm) set by the track pitch setting device 1, and calculating the average time by calculating the average time of the rotation speed of the disk 11 ( The time required for the disk 11 to rotate once is rounded up to an integer value.

The operation of the above configuration will be explained.

Track pitch P set with track pitch setting device 1
(μm) is converted into the number of pulses N by the pitch calculator 2 according to equation (1), and is output to the pulse generator 5. Also,
Track pitch P (μm) and cycle of set rotation speed of disk 11 (time for disk 11 to rotate once) 'r'r
(ms), the period calculator 3 first determines how many rotation periods of the disk 11 the time required for the recording pickup 9 to move one track corresponds to.

If this number of cycles is 81, Bl = P-TP/(A-TT) (2) where Tp (ms) is the average cycle of the pulses output from the pulse generator 5. In reality, Δ is applied from the time the output of the pulse generator 5 stops until the pulse motor 8 completely stops.
Since a time of t (seconds) is required, equation (2) becomes as follows.

B 2 = (P / AT p + Δt) / TT
(3) The period calculator 3 rounds the result of equation (3) up to the decimal point to obtain an integer value, forms the number of rotation periods 83 required for the movement of the recording pickup 9, and outputs it to the timing generator 4. do. The timing generator 4' calculates the set rotation speed period 7 and the rotation period 'I&Bt to time (Bl XT↑
)(□) is the on time, and the time TT1sal is the off time. A timing signal a' is output.

In Figure 2 (a) (83 = 1>, in Figure 2 (d) (B3 =
2), the pulse generator 5 generates N2 pulses when the output of the timing generator 4' is at the high (14) level, as shown in FIG. 2(b) or (e). is output to the pulse motor 8, and the recording pickup 9
is moved in the radial direction of the disk 11. In the recording signal generator 6, when the output of the timing generator 4' is at a low (L) level (time Tt of one revolution of the disk 11), a signal is generated on the disk 11 as shown in FIG. 2(C) or (f). The information signal to be recorded is output to the recording pickup 9.

As described above, the signal for one track is recorded on the disk 11 during the time TT, □ of one rotation of the disk 11, and during the next time fm (Bl x'[', ) t□), the recording pickup 9 The operation of moving the track by one track in the radial direction is repeated.

In this way, the rotation period number B3 is calculated based on the track pitch P set by the period calculation unit 3, and the timing signal a
Since the high (H) level period of ' is set, even if the track pitch P becomes large, the actual track movement time of the recording pickup 9 and the information signal recording period are prevented from overlapping.

Further, it is possible to reduce the wasted time that occurs in the conventional case when the track pitch P is small, and it is possible to shorten the recording time of the information signal onto the disk 11.

Effects of the Invention As described above, according to the present invention, the movement period for moving the recording pickup along one concentric track is always longer than the time the recording pickup actually moves, so that when the set value of the track pitch is large, However, it is possible to prevent the recording period and the tracking movement time of the recording pickup from overlapping, and it is possible to prevent the information signal from being formed in a spiral shape. Further, even when the set value of the track pitch is large, there is less wasted time that occurs when the set value of the track pitch is small, and the recording time of the information signal on the record carrier can be shortened.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the information recording device of the present invention, FIGS. 2(a) to (f) are main waveform diagrams of the information recording device of FIG. 1, and FIG. 3 is a conventional information recording device. [Block diagram of
4(a) to (0 are main waveform diagrams of the information recording device in FIG. 3. 1...Track pitch setter, 2...Pitch calculator, 3...Period calculator, 4) ...timing generator, 5
...Pulse generator, 6...Note #J signal generator, 7.
...TT reference signal generator, 8...pulse motor, 9.
... Recording pickup, 10... TT motor, 11.
...Disc (disk-shaped record carrier).

Claims (1)

[Claims] 1. A recording pickup for recording an information signal concentrically on a disc-shaped record carrier; pitch calculation means for converting a set track pitch of the record carrier into the number of sending pulses; Calculates the average time for moving one track in the radial direction of the record carrier, converts this average time into the number of cycles of the set rotation speed of the record carrier, and outputs the number of cycles as an integer value by rounding up the decimal point. a period calculation means; the timing of the movement period of the recording pickup is generated by multiplying the frequency of the output of the period calculation means by the period of the set rotational speed, and the timing of the information signal recording period by the recording pickup is determined by the period of the set rotational speed; a timing generator that generates a timing generator; and a timing generator that generates pulses equal to the number of sending pulses of the pitch calculation means during a track movement period synchronized with the timing of the output of the timing generator, and moves the recording pickup in the radial direction of the record carrier. An information recording device comprising: a pulse generator; and a recording signal generator that generates the information signal during an information signal recording period synchronized with the timing of the output of the timing generator and outputs the information signal to the recording pickup.