JPH052708A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To stably operate a reproducing system by stopping the erasing operation of a magnetic erasing head, recording erased data in an erased area, and completing a recording mode. CONSTITUTION:In a recording mode, an area ARE scanned by a magnetic erasing head 6A is scanned by a following magnetic recording and reproducing head 6B, prescribed recording currents IW are supplied to the head 6B after the polarity of the recording currents IW is switched according to input data DATA, the input data DATA are recorded through the head 6B in a prescribed recording medium. Then, the data erased by the head 6A are recorded in the area ARE erased by the head 6A, and the recording mode is completed. Moreover, at the time of recording the erased data, the recording currents IW are made to gradually fall to almost zero level.

Description

Detailed Description of the Invention

[0001]

[Table of Contents] The present invention will be described in the following order. Industrial applications Conventional technology (Fig. 1) Problems to be Solved by the Invention (FIGS. 1 and 6) Means for Solving the Problems (FIGS. 1 and 2) Action (Figs. 1 and 2) Example (1) First embodiment (FIGS. 1 and 2) (2) Second embodiment (FIGS. 3 and 4) (3) Third embodiment (FIG. 5) (4) Other embodiments The invention's effect

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and can be applied to, for example, a floppy disk apparatus.

[0003]

2. Description of the Related Art Conventionally, in this type of floppy disk device, desired data can be recorded / reproduced by using a control circuit 2 and a write / read circuit 4 which are integrated into a circuit as shown in FIG. There is.

That is, in the floppy disk device 1, for example, the control command C of the computer is sent to the control circuit 2.
Input ODATA and input data DATA. Here, the control circuit 2 switches the operation mode of the floppy disk device 1 according to the control command COMD, and drives a mechanical drive circuit (not shown) as necessary.

At this time, in the recording mode, the control circuit 2
Lowers the erasing control signal XERS and outputs it to the writing / reading circuit 4, thereby driving the erasing magnetic head 6A for a predetermined period. Further, the control circuit 2 simultaneously lowers the write control signal XWGO to set the write / read circuit 4 in the recording mode, and then sequentially outputs predetermined recording data XWDO in accordance with the input data DATA.

In response to this, write / read circuit 4 erases magnetic head 6 when erase control signal XERS falls.
A predetermined direct current is supplied to A. Here, the erasing magnetic head 6A is constructed integrally with the recording / reproducing magnetic head 6B so as to scan the floppy disk prior to the recording / reproducing magnetic head 6B, whereby the erasing control signal XERS falls. During this period, the previously recorded data is erased in the area scanned by the recording / reproducing magnetic head 6B.

Further, when in the recording mode, the writing / reading circuit 4 drives the recording / reproducing magnetic head 6B with the recording current IW determined by the external recording current setting resistor 8 according to the recording data XWDO which is sequentially input. To do. Thus, in the floppy disk device 1, the input data DATA can be sequentially recorded with a predetermined format.

That is, as shown in FIG. 6, in the floppy disk device 1, each recording track TR (see FIG.
Input data is recorded on a sector basis in (A)). At this time, a predetermined gap 2 is provided before and after each input data.
And 3 are formed. On the other hand, in the floppy disk device 1, the erasing magnetic head 6A is raised in the area of the gear 2 and at the same time, the write enable signal WEN (FIG. 6B) is lowered.

As a result, in the floppy disk device 1, after the input data DATA is sequentially recorded in the area erased by the erasing magnetic head 6A, the recording operation is stopped in the area of the gear 3 (FIG. 6 (C)), and the recording is completed. Data (symbol O
New input data (denoted by ND)
It is designed to record.

[0010]

However, when the magnetic heads 6A and 6B are driven in this manner, the erasing is performed by scanning the area ARE preceding the recording / reproducing magnetic head 6B by the erasing magnetic head 6A. The magnetic head 6B for erasing also erases an extra area where no data is recorded.

Therefore, on the recording track TR, there is a region in which no data is recorded, which makes it difficult to obtain the reproduction signal SRF from the region (FIG. 6 (D)). For this reason, in the floppy disk device 1, during reproduction, it is difficult to extract the reproduction clock during the period in which the magnetic head 6B scans the area, and the operation of the entire reproduction system becomes unstable.

The present invention has been made in consideration of the above points, and an object thereof is to propose a magnetic recording / reproducing apparatus capable of stably operating a reproducing system.

[0013]

In order to solve such a problem, in the first invention, in the recording mode, the area ARE scanned by the erasing magnetic head 6A is scanned by the following recording / reproducing magnetic head 6B. , Input data DA
In a magnetic recording / reproducing apparatus 10 for switching the polarity of a predetermined recording current IW according to TA and supplying it to a recording / reproducing magnetic head 6B, and recording input data DATA on a predetermined recording medium via the recording / reproducing magnetic head 6B. After the erasing operation of the erasing magnetic head 6A is stopped, the erasing magnetic head 6A
The data (4E) erased by the erasing magnetic head 6A is recorded in the area ARE erased by A, and the recording mode is ended.

Further, in the second aspect of the invention, when the erased data (4E) is recorded, the recording current IW is gradually lowered to about 0 level.

Further, in the third invention, the area ARE scanned by the erasing magnetic head 6A in the recording mode.
Is scanned by the following recording / reproducing magnetic head 6B, and the polarity of a predetermined recording current IW is switched according to the input data DATA and supplied to the recording / reproducing magnetic head 6B.
Input data DATA via the recording / reproducing magnetic head 6B
In the magnetic recording / reproducing apparatus 10 for recording the data on a predetermined recording medium, after the erasing operation of the erasing magnetic head 6A is stopped,
The data (4E) erased by the erasing magnetic head 6A is recorded in the area ARE erased by the erasing magnetic head 6A, and then the demagnetization is performed by switching the polarity at a constant cycle while gradually decreasing the recording current IW. The recording data DS is recorded, and the recording mode ends.

[0016]

After the erasing operation of the erasing magnetic head 6A is stopped, the data (4E) erased by the erasing magnetic head 6A is recorded in the area ARE erased by the erasing magnetic head 6A and the recording mode is terminated. The reproduction signal can be obtained from the area where the erasing magnetic head 6A has additionally erased, and the operation of the reproducing system can be stabilized accordingly.

Further, at this time, if the recording current IW is gradually lowered to about 0 level, the reproduction signal SRF
The CN ratio can be improved.

Further, not only the data (4E) erased by the erasing magnetic head 6A but also the data (4E) is recorded, and then the recording current IW is gradually lowered,
By recording the degaussing data DS whose polarity is switched at a constant cycle, the operation of the reproducing system is stabilized and the CN of the reproducing signal SRF is
The ratio can be improved.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings.

(1) First Embodiment In FIG. 1, reference numeral 10 indicates a floppy disk device as a whole, and a control circuit 11 instead of the control circuit 2 controls a write / read circuit 14.

That is, as shown in FIG. 2, in the control circuit 11, with respect to the recording track TR (FIG. 2A),
At the same timing as the control circuit 2, the write enable signal WE
N (FIG. 2 (B)) and erase control signal XERS (FIG. 2).
(C)) is output to control the write / read circuit 14.

Further, the control circuit 11 causes the write gate signal WGT (see FIG. 2) at the same time as the write enable signal WEN.
After (D)) is lowered, the write enable signal WEN is raised and the write gate signal WGT is raised after a lapse of a predetermined period. As a result, in the floppy disk device 1, after the operation of the erasing magnetic head 6A is stopped and controlled, the recording / reproducing magnetic head 6B completes scanning the area erased by the erasing magnetic head 6A. The magnetic head 6B is held in a recorded state.

Further, the control circuit 11 outputs the input data DATA in a predetermined format while the write enable signal WEN falls. On the other hand, the write / read circuit 14 internally generates predetermined data, and the write data XW
Following the DO, the data is recorded. As a result, in the floppy disk device 10,
The erased magnetic head 6A records the erased area without fail, thereby preventing discontinuity of the reproduction signal SRF.

That is, the writing / reading circuit 4 stores the data to be recorded in the gear 3 as the relevant data (in the case of this embodiment,
The data corresponding to the input data of the value 4E) is internally generated and the data is recorded (FIG. 2 (E)).
Accordingly, in the floppy disk device 10,
The preceding erasing magnetic head 6A re-records the data before erasing in the area that has been erased excessively so that the generation of an unrecorded portion can be effectively avoided.

Therefore, in the reproducing system, even when the reproducing clock is extracted from the reproducing signal SRF, the reproducing signal can be obtained from the area erased excessively by the erasing magnetic head 6A, so that the reproducing clock is surely extracted. As a result, the operation of the floppy disk device 10 can be stabilized.

According to the above structure, by re-recording the data recorded in the area erased by the preceding erase magnetic head, the area erased by the erase magnetic head is deleted. Also, a reproduction signal can be obtained, so that the reproduction clock can be reliably extracted and the operation of the reproduction system can be stabilized.

(2) Second Embodiment As shown in FIG. 3, in this embodiment, the floppy disk device 20 supplies the power supply V _CC to the recording current setting resistor 8 through the transistor 12.

Further, in the floppy disk device 20, the capacitor 13 is connected between the base and collector of the transistor 12 and the power supply V _CC is supplied to the base through the resistor 16. As a result, in the floppy disk device 20, the terminal voltage of the recording current setting resistor 8 is lowered with a predetermined time constant in response to the OFF operation of the transistor 12.

In response to this, the control circuit 22 writes the control signal XWGO for writing during the period in which the recording / reproducing magnetic head 6B scans the area erased by the erasing magnetic head 6A.
Raise the signal level of. As a result, in the floppy disk device 20, the terminal voltage of the recording current setting resistor 8 is gradually lowered when the data before erasing (that is, 4E) is recorded in the area erased by the erasing magnetic head 6A. The recording current IW is lowered to almost 0 level immediately before the scanning of the area is completed.

Therefore, in the floppy disk device 20, by gradually lowering the recording current IW,
The remanent magnetization of the recording / reproducing magnetic head 6B can be reduced, and thereby the recording / reproducing magnetic head 6B is demagnetized by effectively utilizing the area erased by the erasing magnetic head 6A.

In practice, in this type of floppy disk device, if the recording wavelength is shortened to improve the recording density,
As a result, the C / N ratio of the reproduced signal deteriorates, and it becomes difficult to correctly reproduce the data.

In this case, it has been found that the demagnetization of the recording / reproducing magnetic head 6B as in this embodiment can improve the CN ratio, and at the same time improve the peak shift and the asymmetry of the reproduced signal.

According to the configuration of FIG. 3, the recording current is gradually lowered and the data before erasure is recorded again in the extra erased area, thereby stabilizing the operation of the reproducing system and simultaneously reproducing the reproduced signal. The CN ratio and the like can be improved.

(3) Third Embodiment As shown in FIG. 5, in this embodiment, data (4E) before erasure is recorded for a predetermined period in a region where the erasing magnetic head 6A has additionally erased. After that, the predetermined degaussing data DS is subsequently recorded.

At this time, in the writing / reading circuit, the recording current is inverted at the clock cycle of the recording data.
Data having a duty ratio of 50% is generated and recorded as recording data DS on the floppy disk.

Thus, in the floppy disk device, if the degaussing data having the duty ratio of 50% is generated and the recording current is gradually lowered to perform the recording, the magnetic head 6B for recording and reproducing can be surely demagnetized. Therefore, the CN ratio of the reproduced signal can be improved accordingly. Further, by re-recording the data before erasing, the operation of the reproducing system can be stabilized.

(4) Other Embodiments In the above-described embodiments, the case where the magnetic head is degaussed using the degaussing data whose signal level is inverted at the clock cycle of the recording data has been described. However, various data can be applied to the degaussing data as necessary.

Further, in the above-mentioned embodiment, the case where the present invention is applied to the floppy disk device in which the degaussing magnetic head and the recording / reproducing magnetic head are integrally formed has been described, but the present invention is not limited to this and various other embodiments are possible. The present invention can be widely applied to various recording / reproducing devices such as a hard disk device and not limited to the floppy disk device.

[0039]

As described above, according to the present invention, by re-recording the data before erasure in the area erased by the erasing magnetic head, the reproduction clock can be surely extracted during reproduction. The operation of the minute reproduction system can be stabilized.

[Brief description of drawings]

FIG. 1 is a block diagram showing a floppy disk device according to an embodiment of the present invention.

FIG. 2 is a signal waveform diagram for explaining the operation.

FIG. 3 is a block diagram showing a floppy disk device according to the second embodiment.

FIG. 4 is a signal waveform diagram showing the recording waveform.

FIG. 5 is a signal waveform diagram showing a recording waveform according to a third embodiment.

FIG. 6 is a signal waveform diagram for explaining the operation of a conventional floppy disk device.

[Explanation of symbols]

1, 10, 20 ... Flotpi disk device, 2, 11,
22 ... Control circuit, 4, 14 ... Write / read circuit, 6A,
6B ... Magnetic head, 12 ... Transistor, 13 ...
Capacitors.

[Procedure amendment]

[Submission date] February 10, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

That is, as shown in FIG. 6, in the floppy disk device 1, each recording track TR (see FIG.
Input data is recorded on a sector basis in (A)). At this time, a predetermined gap 2 is provided before and after each input data.
And 3 are formed. On the other hand, in the floppy disk device 1, the write control command is
The fall of the de WEN (FIG. 6 (B)), launched erase magnetic head 6A in the region of Giyatsupu 2, at the same time serial
Above gel up the recording and reproducing magnetic head 6B.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0010

[Correction method] Change

[Correction content]

[0010]

When driving the hand magnetic head 6A and 6B in this manner [0008] By scanning the area ARE the erasing magnetic head 6A was ahead of the recording and reproducing magnetic head 6B, recording The reproducing magnetic head 6B erases even an extra area where no data is recorded.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

That is, as shown in FIG. 2, in the control circuit 11, with respect to the recording track TR (FIG. 2A),
The erase control signal XERS is issued by the write control command WEN (FIG. 2B) at the same timing as the control circuit 2.
(FIG. 2 (C)) is output, and the write / read circuit 14
To control.

[Procedure amendment 4]

[Document name to be amended] Statement

[Name of item to be corrected] 0022

[Correction method] Change

[Correction content]

Further, the control circuit 11 is a writing control frame.
And write WEN and write gate signal XWGO (see FIG. 2).
(D)), and then the write control command WEN
Write gate signal X has elapsed but Tachinobo Gatsute predetermined period
Launch WGO . As a result, in the floppy disk device 1, after the operation of the erasing magnetic head 6A is stopped and controlled, the recording / reproducing magnetic head 6B completes scanning the area erased by the erasing magnetic head 6A. The magnetic head 6B is held in a recorded state.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0023

[Correction method] Change

[Correction content]

Further, the control circuit 11 is a writing control frame.
Between the command WEN falls period, input data DATA
Is output in a predetermined format and the write control command W
Write gate signal XWGO after EN rises
During the period until launching , the specified data is generated internally,
The input data DATA is output subsequently to the data. As a result, the floppy disk device 10
In this case, the erased magnetic head 6A records the erased area without fail, whereby the reproduction signal SR
It is designed to prevent the discontinuity of F.

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

[0025] In accordance connexion reproducing system, even when extracting a reproduction clock from the reproduction signal SRF, by being able to also obtain a reproduced signal from the erasing magnetic head 6A is erased extra area, out extraction reliably reproduced clock You can

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0026

[Correction method] Change

[Correction content]

According to the above structure, by re-recording the data recorded in the area erased by the preceding erase magnetic head, the area erased by the erase magnetic head is deleted. Can also obtain the playback signal, which ensures that the playback clock is extracted and the entire playback system is recovered.
It can stabilize the movement of the body .

[Procedure Amendment 8]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

In response to this, the control circuit 22 controls the head degaussing control signal D during the period in which the recording / reproducing magnetic head 6B scans the area where the erasing magnetic head 6A has excessively erased.
Raise the MAG signal level. As a result, in the floppy disk device 20, the erasing magnetic head 6
Data that has not been erased (that is, 4
(Recorded by E), the terminal voltage of the recording current setting resistor 8 is gradually lowered, and the recording current IW is lowered to almost 0 level immediately before the scanning of the area is completed.

[Procedure Amendment 9]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure Amendment 10]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

[Procedure Amendment 11]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Keiichi Taguchi             Sony 6-735 Kitashinagawa, Shinagawa-ku, Tokyo             Within the corporation

Claims (3)

[Claims] 1. In the recording mode, a region for scanning by the erasing magnetic head is scanned by a succeeding recording / reproducing magnetic head, and a polarity of a predetermined recording current is switched according to input data to thereby perform the recording / reproducing magnetic field. In a magnetic recording / reproducing apparatus which supplies the data to the head and records the input data on a predetermined recording medium via the recording / reproducing magnetic head, after the erasing operation of the erasing magnetic head is stopped, the erasing magnetic head is A magnetic recording / reproducing apparatus characterized in that the data erased by the erasing magnetic head is recorded in the erased area, and the recording mode is terminated. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the recording current is gradually lowered to about 0 level when the erased data is recorded. 3. In the recording mode, the area scanned by the erasing magnetic head is scanned by a succeeding recording / reproducing magnetic head, and the polarity of a predetermined recording current is switched based on the input data so that the recording / reproducing magnetic head is switched. In a magnetic recording / reproducing apparatus which supplies the data to the head and records the input data on a predetermined recording medium via the recording / reproducing magnetic head, after the erasing operation of the erasing magnetic head is stopped, the erasing magnetic head is In the erased area, the data erased by the erasing magnetic head is recorded, and then the degaussing data in which the polarity is switched at a constant cycle is recorded in the state where the recording current is gradually lowered to set the recording mode. A magnetic recording / reproducing apparatus characterized by being completed.