JPH0749605Y2 - Data recording / reproducing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data recording / reproducing apparatus, and more particularly to a data recording / reproducing apparatus that uses a rotary head to realize a recording method for continuing recording while performing verification.

Problems to be Solved by Conventional Technology and Invention Conventionally, a data recording / reproducing apparatus for continuing recording while performing collation has a fixed head structure, and a dedicated recording head and a dedicated recording head for immediately reproducing the recorded data. This is a configuration in which a reproducing head is provided in parallel. Although each head has multiple channels, the tracks are formed in the longitudinal direction of the tape, so that the recording density on the magnetic tape was low.

Therefore, in order to increase the recording density, it is conceivable to form a track obliquely with respect to the tape and record the data there, as in the case of a video tape recorder. However, in the video tape recorder, the collating operation in the recording mode cannot be performed, and a devise is required for tracking in the reproduction mode. Therefore, a general video tape recorder is directly applied to the data recording / reproducing apparatus of the above kind. I couldn't do that.

Means and Actions for Solving Problems In the present invention, in the recording mode, the data to be recorded is processed, and the data is collectively recorded into the block unit as the recording data signal, and the verification data signal is verified.
A data processing circuit that processes a reproduction data signal, and a servo circuit that outputs a recording servo signal and performs a verification servo signal verification in the recording mode, and that outputs a tracking control signal by supplying the reproduction servo signal in the reproduction mode. , The magnetic tape is mounted on a rotating body around which the tape has a predetermined azimuth, and the magnetic tape is scanned obliquely, and the recording servo signal and the recording data signal are recorded on an oblique track in the recording mode. In the reproduction mode, a write / read rotary head that reproduces the recorded data signal that is recorded and sends out the reproduced data signal is paired with the write / read rotary head, and the rotary body rotates in the direction of rotation and the rotation described above. Mounted on the rear side of the head and at a height that can trace the diagonal track formed by the rotary head The recording head has the same azimuth as the predetermined azimuth of the rotary head. In the recording mode, the recording data signal recorded immediately before is reproduced and the collation data signal is sent out. The verification / servo rotary head that reproduces the servo signal and sends out the reproduced servo signal, and the part of each diagonal track on the start side is the control servo area where the recording servo signal is recorded, and the remaining part is the recording data signal. So as to be a data area for recording, a first switch means for switching and connecting the data processing circuit or the servo circuit and the write / read rotary head in the recording mode, and the collation / servo in the recording mode. The verification servo signal from the rotary head is supplied to the servo circuit, and the verification / servo rotary head outputs the verification servo signal. The verification / servo rotary head and the servo circuit or the data processing circuit are switched and connected so that the verification data signal is supplied to the data processing circuit, and is connected to the servo circuit side during the reproduction mode. And a second switch means.

Embodiment FIG. 1 shows an embodiment of a data recording / reproducing apparatus according to the present invention.

In the figure, 1 is a data processing circuit,
The data signal from the terminal 2 is processed and combined into a block unit to form a recording data (digital) signal, and the collation data signal reproduced by the collation / servo rotary head 4 is supplied to perform collation. Write in playback mode /
Processing is performed so that the reproduction data (digital) signal reproduced by the read rotary head 3 is returned to its original form.

Reference numeral 5 denotes a servo circuit which, in the recording mode, sends a recording servo signal and is supplied with a verification servo signal reproduced by the verification / servo rotary head 4 to perform verification. In the reproducing mode, the reproducing servo signal reproduced by the write / read rotary head 3 is supplied, and the tracking control signal is supplied to the capstan motor 6 shown in FIG. A drum rotation signal is supplied from the terminal 7 to the servo circuit 5.

Reference numeral 10 is a first electronic switch means, which is a circuit 1 and a circuit 5.
Is provided between the rotary head 3 and the rotary head 3, and a switching signal from a terminal 11 in FIG. 7 is applied to the terminal 12 to perform a switching operation as described later.

Reference numeral 13 denotes a second electronic switch means, which is provided between the rotary head 4 and the circuits 1 and 5, and a switching signal from the terminal 14 in FIG. Operate.

Reference numeral 16 denotes a mode switching electronic switch, which is provided between the rotary head 3 and the circuit 1 and the first switch means 10.

Reference numeral 20 denotes a rotary drum device, which comprises a lower fixed drum 21 and an upper rotary drum 22 rotating at 1800 rpm in the direction of arrow A, as shown in FIG.

The rotary heads 3 and 4 form a pair and are attached to the lower surface of the rotary drum 22. On the circumferential direction, as shown in FIG. 3, they are opposed by 180 degrees. The rotary head 3 precedes the rotary head 4 in the drum rotation direction. As shown in FIG. 2, in the height direction, the center of the rotary head 3 is located at a height h ₁ higher than the reference level 23, and the rotary head 4 has a height h ₂ lower than the height h ₁ by Δh. In position. Δh will be described later.

The rotary head 3 has a track width T _W1 (= 25 μm), and the rotary head 4 has a track width T _W2 . Both rotary heads 3 and 4 have the same azimuth (+ α).

The magnetic tape 24, as shown in FIG.
20 to 221 degrees spirally wrapped and capstan 25
It is pinched and driven by the pinch roller 26 and in the direction of arrow B.
It will be driven at 14.345 mm / s.

As shown in FIG. 4, one rotary head 3 travels on the tape 24 in the direction of arrow C, and oblique tracks T _N-2 , T _{N- are} inclined on the tape 24 with respect to the tape longitudinal direction by an angle θ. ₁ , T _N is formed. The width T of each track is 25 μm, and the track pitch P is 41 μm. A guard band 27 is provided between adjacent tracks, and its width G is 16 μm.

Here, the height h ₂ is such that Δh is 1/2 of the track pitch P,
That is, it is set to be 20.5 μm. As a result, the rotary head 4 traces the track T in a state where its center coincides with the center of the track T formed by the rotary head 3 immediately before, as shown in FIG. The track width T _W2 of the rotary head 4 is set to 75 μm. Therefore, the rotary head 4 traces over the track T _N and the track T _N-1 immediately before this in the recording mode as shown in FIG. 4, and in the reproducing mode as shown in FIG. Trace over the track T _N and the tracks T _N-1 and T _{N + 1} on both sides thereof. FIG. 4 shows the rotary head 3 immediately before the completion of the formation of the track T _N.

FIG. 5 shows the format of the track T _N in correspondence with the rotation angle of the rotary drum 22. The track T _N spans 221 °. Reference numeral 30 is a reference position, 31 is a starting end, and 32 is an ending end.

33 is a control servo area, which is a range extending from the reference position 30 toward the starting end 31 side by 26 °. As shown in FIG. 6 as well, this area 33 is divided into four, and single signals of 100 kHz are recorded at different positions in sequence. Cross-hatching indicates a portion where this single signal is recorded.

34 is a data area, 180 from the reference position 30 to the end side
This is the range over which the digital data is recorded.

5 ° on the start end 31 side and the end end 32 side are overlap areas 35 and 36, respectively.

The above track format is formed by switching the first electronic switch means 10 in FIG. FIGS. 7 and 8A to 8E show means for controlling the switching of the switch means 10.

The drum motor 40 has a magnet 4 corresponding to the rotary heads 3 and 4.
1,42 is attached. When the drum motor 40 rotates, the sensor 43 detects the magnets 41 and 42 and outputs the signal a having the waveform shown in FIG. After passing through the amplifier 44, the signal a is applied to the mono-multivibrators 45 and 46, and the mono-multivibrator 45 outputs a pulse signal b shown in FIG.
A pulse signal c shown in FIG. 8 (C) is output from the mono multivibrator 46. The pulse signals b and c are R-
It is set and reset by being applied to the S terminal and R terminal of the S flip-flop circuit 47, and the pulse signal d shown in FIG. 8 (D) is output. This pulse signal is applied to a waveform shaping circuit 48 composed of a mono-multi circuit, where the waveform is shaped, and as shown in FIG. 8 (E), the rotation angle of the drum is delayed by 144 degrees from the rise of the pulse signal d. The rising pulse signal e is output.

This pulse signal e is taken out from the terminal 11 and applied to the first electronic switch means 10 through the terminal 12 in FIG.
The first electronic switch means 10 is connected to the contact d ₁ side while the pulse signal e is at the H level and is connected to the contact s ₁ side during the L level, as shown in the following table.

The pulse signal d is taken out from the terminal 14, and the terminal 15 in FIG.
Through the second electronic switch means 13 through. This switch means 13 is a contact when the pulse signal d is at H level.
Connected to the contact point s ₂ side during the L level on the d ₂ side, as shown in the following table.

Next, the operation of the apparatus of FIG. 1 in the recording mode will be described with reference to FIG.

First, in the recording mode, the electronic switch 16 is connected to the REC side, and the connection state of the electronic switch 16 and the first and second switch means 10 and 13 in the recording mode is as shown in Table 1 below.

In the section of −36 ° to 0 °, the first electronic switch means 10 is connected to the contact s ₁ side, and the rotary head 3 receives the recording servo signal from the servo circuit 5 as the first electronic switch means.
10 and electronic switch 16. As shown in FIG. 9A, servo signals are recorded in the section of -36 ° to 0 °.

When the rotary head 3 reaches the reference position 30, the first electronic switch means 10 is switched to the contact d ₁ side, and this time the recording data signals processed by the data processing circuit 1 and collected in block units are output. , The first electronic switch means 10 and the electronic switch 16 to the rotary head 3. 0 ° ~ 18
The recording data signal is recorded in the section of 0 °.

As a result, the track T _N is formed in FIG. Similarly, the rotary head 3 sequentially and intermittently forms the tracks T _N-2 , T _N-1 , T _{N + 1} .

The rotary head 4 traces the track T _N formed immediately before by the rotary head 3, as shown in FIGS. 4 and 9B.

That is, when the rotary head 3 reaches 144 °, the rotary head 4 starts tracing the track T _N. The second electronic switch means 13 is connected to the contact s ₂ side, and the verification servo signal reproduced by the rotary head 4 is supplied to the servo circuit 5 via the amplifier 17 and the second electronic switch means 13, where , Is collated.

When the rotary head 3 reaches 180 ° (the rotary head 4 enters the data area of the track T _N ), the second electronic switch means
13 is switched to the contact d ₂ side, and the collation data signal reproduced by the rotary head 4 is supplied to the data processing circuit 1 via the amplifier 17 and the second electronic switch means 13, and collation is performed there.

As a result of the collation, when it is determined that the recording is not normally performed, the above block unit signal is recorded on the next track T _{N + 1} .

As described above, the recording of the data signal is performed while the first half rotation of the rotating drum records and the second half rotation checks.

Next, regarding the operation of the apparatus shown in FIG. 1 in the reproduction mode,
Description will be made with reference to the drawings.

In the reproduction mode, in FIG. 1, the electronic switch 16 is connected to the PB side, and the second electronic switch means 13 remains connected to the contact s ₂ side. The first electronic switch means 10 may be connected to any.

The rotary head 3 traces a track T _N as shown in FIG. 10 and reproduces a data signal. The reproduced data signal is applied to the data processing circuit 1 via the electronic switch 16 and the amplifier 18, where it is restored to the original data signal and output from the terminal 2.

As shown in FIGS. 6 and 10, the rotary head 4 traces over the track T _N and the tracks T _N-1 and T _{N + 1} on both sides of the track T _N to scan each servo area when scanning the servo area. A single signal is reproduced, which is supplied to the servo circuit 5 via the amplifier 17 and the second electronic switch means 13. Here, the servo signal is formed by taking the difference between the detection amounts of the single signals from the tracks T _N-1 and T _N on both sides, and the servo signal is held. This servo signal is applied to the capstan motor 6, and the rotational speed of the capstan 25 is controlled to control the tracking of the rotary head 3 (4).

The rotary heads 3 and 4 do not need to face each other by 180 °, and may be arranged so that the rotary head 4 traces the track formed by the rotary head 3.

Effect of the Invention As described above, according to the data recording / reproducing apparatus of the present invention, it is possible to record the data while collating the recorded contents by using the rotary head. Therefore, the tracks are formed obliquely in the longitudinal direction of the tape, and the high density of data recording can be achieved.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of a data recording / reproducing apparatus according to the present invention, FIG. 2 is an elevation view of a rotary drum device showing the height relationship of a rotary head together, and FIG. 3 is a winding of magnetic tape. FIG. 4 is a plan view of the rotary drum device showing a mounting state, FIG. 4 is a view showing a scanning state of the rotary head and a track pattern formed on the tape in a recording mode, and FIG. 5 is a format of one track in FIG. 6 is a diagram showing a recording pattern of a single signal in a servo area of each track together with a collation / servo rotary magnetic head for scanning the same, and FIG. 7 is a pulse signal for switching the switch means. 8A to 8E are diagrams showing signal waveforms of respective portions in FIG. 7, and FIG. 9A is a recording operation by the write / read rotary head in the recording mode. , The figure (B) is collation / Diagram for explaining the verification operation according turbo rotating head, FIG. 10 is a diagram showing a track scan state of each rotary head in the reproduction mode. 1 ... Data processing circuit, 3 ... Write / read rotary head, 4 ... Collation / servo rotary head, 5 ... Servo circuit, 6 ... Capstan motor, 10 ... First electronic switch means, 12, 15 ... Terminal, 13 ... Second electronic switch means, 16 ... Mode switching electronic switch, 20 ... Rotating drum device, 21 ... Fixed drum, 22 ... Rotating drum, 23 ...
Standard level, 24 …… magnetic tape, 25 …… capstan,
26 …… Pinch roller, 27 …… Guard band, 30 …… Reference position, 31 …… Start end, 32 …… End, 33 …… Control servo area, 34 …… Data area, 35,36 …… Overlap area, 40 …… drum motor, 41, 42 …… magnet, 43
...... Sensor, 45,46 …… Mono multi-vibrator, 47 ・ ・ ・
… RS flip-flop circuit, 48… Waveform shaping circuit.

Claims (1)

[Scope of utility model registration request] 1. A data processing circuit for processing data to be recorded in a recording mode, collectively forming a recording data signal for each block, and collating a collation data signal, and processing a reproduced data signal in a reproduction mode. In the recording mode, the servo circuit sends out the recording servo signal and collates the verification servo signal. In the reproduction mode, the servo circuit is supplied with the reproduction servo signal and outputs the tracking control signal, and the rotation around which the magnetic tape runs. It is attached to the body, has a predetermined azimuth, scans the magnetic tape diagonally, records the recording servo signal and the recording data signal on an oblique track in the recording mode, and records the recorded data in the reproduction mode. A write / read rotary head for reproducing a signal and transmitting the reproduced data signal; The rotary head is paired with the output rotary head, and is attached to the rotary body in the direction of rotation in a rear side of the rotary head and at a height position where an oblique track formed by the rotary head can be traced. In the recording mode, the recorded data signal recorded immediately before is reproduced and the collation data signal is sent out. In the reproduction mode, the recorded servo signal recorded is reproduced and reproduced. The verification / servo rotary head that sends out the servo signal, and the part of each diagonal track on the start side is the control servo area where the recording servo signal is recorded, and the remaining part is the data area where the recording data signal is recorded. As described above, in the recording mode, the data processing circuit or the servo circuit and the write / read rotary head are connected to each other. In the recording mode, the first switching means to be connected in turn is supplied with the verification servo signal from the verification / servo rotary head to the servo circuit, and the verification data signal from the verification / servo rotary head is sent to the data processing circuit. So that the collation / servo rotary head and the servo circuit or the data processing circuit are switched and connected, and a second switch means is connected to the servo circuit side during the reproduction mode. Data recording and reproducing device.