JPH087549A - Magnetic recording device - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a magnetic recording apparatus that secures the minimum length of longitudinal recording joint intervals and does not impair reading of longitudinal tracks. [Structure] The controller 1 independently has a longitudinal in-point memory 3 for storing an in-point indicating a recording start point of a longitudinal track and a helical in-point memory 5 for storing an in-point indicating a recording start point of a helical track. ing. Similarly, a longitudinal out point memory 2 for storing an out point indicating a recording end point of a longitudinal track and a helical out point memory 4 for storing an out point indicating a recording end point of a helical track are independently provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording apparatus suitable for use in, for example, continuous recording of a data recorder.

[0002]

2. Description of the Related Art Conventionally, in a video tape recorder or a data recorder, user data is recorded and / or reproduced by helical scanning. That is, the magnetic head is mounted on a predetermined rotating drum device and rotated, and recording and / or reproducing is sequentially performed in a diagonal direction with respect to the longitudinal direction of the magnetic tape running while being wound on the rotating drum device.

In such a helical scan type tape recorder, as a tape format, in addition to a helical track for recording user data, longitudinal tracks are provided at the upper end side and the lower end side in the width direction of the magnetic tape. There is.

One of the tracks in the longitudinal direction is a control track provided on the upper end side in the width direction of the magnetic tape, and the other is a time code track provided on the upper end side in the width direction of the magnetic tape. The control track records a control signal that servo-controls a capstan for holding and running a magnetic tape with a driven pinch roller. The time code track is for recording a time code as an absolute address on the magnetic tape.

Both the control track and the time code track are indispensable for tape control of a tape recorder, and when either of these becomes defective in recording or reading, the magnetic tape is normally run by the capstan. Since it becomes impossible to know the absolute position on the magnetic tape by the time code, the tape recorder cannot operate normally.

On the other hand, in the case of so-called assemble recording in which continuous recording is performed while maintaining continuity in the longitudinal direction of the magnetic tape, the signal waveform is not always accurately connected at the in-point indicating the recording start position as the joint. Therefore, there is a high possibility that the signal of the long track will be read poorly. For this reason, the signal processing circuit in the longitudinal direction is designed so as to slow down the signal processing so that the signals of the longitudinal tracks are continuous, and to devise a design so as to compensate for some signal loss.

Conventionally, in a video tape recorder or a data recorder, when performing so-called crash recording in which no in-point is designated as a recording start point or assemble recording in which the in-point is designated, recording of a helical track and a longitudinal track is performed. Were to start at the same time and end at the same time. For this reason, if recording is performed with one frame in the video tape recorder and with the shortest recording length such as 1ID in the data recorder, the recording joints of the longitudinal tracks on the magnetic tape also continue at the same intervals. When reproducing such a magnetic tape, the capacity of processing for correcting the longitudinal signal is exceeded as described above, and as a result, the capstan servo cannot be locked by the servo lock, or the magnetic tape cannot be run. The absolute position on the tape cannot be detected, and the search for detecting the tape position cannot be performed.

In particular, when the data recorder is used as a tape streamer, the recording of one to several IDs is likely to be repeated depending on the size of the file to be recorded, so that the above-mentioned problem is likely to occur. In order to solve this problem, there is a method of helically recording padding data as meaningless dust data so that the longitudinal recording length becomes a certain length or more. However, there is a new drawback that the use efficiency of the magnetic tape is reduced by the amount of padding data. In the case of the data recorder described above, there is a limitation that data can be recorded only in units of several IDs when transferring data from the host computer. Here, the ID is a unit of data used for cueing the tape, and corresponds to the time code of the video tape recorder. 1 ID = 4 tracks = 128 kilobytes.

[0009]

As described above, both the control track and the time code track provided on the longitudinal track are indispensable for tape control of the tape recorder, and are a cause of operational restrictions. Therefore, if any of these becomes defective in recording or defective in reading, the tape recorder cannot operate normally.

Further, when padding data as meaningless dust data is helically recorded and the longitudinal recording length is set to a certain length or longer, the use efficiency of the magnetic tape is reduced by the amount of the padding data. was there.

The present invention has been made in view of the above points,
An object of the present invention is to provide a magnetic recording device which secures a minimum length of longitudinal recording joint intervals and does not impair reading of longitudinal tracks.

[0012]

The magnetic recording apparatus according to the present invention, as shown in FIGS. 1 to 9, has an oblique recording means 20.
Scans the magnetic tape 40 in an oblique direction with respect to the running direction of the magnetic tape 40, and scans the magnetic tape 40 on the magnetic tape 40.
The diagonal recording area 41 for recording data diagonally with respect to the longitudinal direction of the magnetic tape 40 and the longitudinal recording means 9 and 16 scan the magnetic tape 40 in the running direction of the magnetic tape 40 to magnetically record on the magnetic tape 40. In a magnetic recording / reproducing apparatus for performing recording in a recording format having longitudinal recording areas 42, 43 for recording at least an absolute position on the magnetic tape 40 in the longitudinal direction of the tape 40, at least in the longitudinal recording areas 42, 43. A recording end position storage means 2 for storing the recording end position, an oblique recording area 41 by the oblique recording means 20 and / or a longitudinal recording means 9,
Control means 1 for controlling the recording operation in the longitudinal recording areas 42, 43 by means of 16, and when the recording in the oblique recording area 41 by the oblique recording means 20 at the time of recording is completed, the absolute value on the magnetic tape 40 is absolute. When the longitudinal recording length X obtained by subtracting the recording end position in the longitudinal recording areas 42, 43 from the position is less than the predetermined recording length Z, control is performed until the longitudinal recording length X reaches the predetermined recording length Z. The means 1 extends and records only the longitudinal recording areas 42 and 43 by the longitudinal recording means 9 and 16.

The magnetic recording apparatus of the present invention, as shown in FIGS. 1 to 9, has the above-described recording end position storage means 2,
Reference numeral 4 stores the recording end position in the diagonal recording area 41 and / or the longitudinal recording areas 42 and 43. At the start of recording, the longitudinal recording means 9 and 1 have already been recorded.
By the control means 1, up to the recording end position where only the longitudinal recording areas 42 and 43 by 6 are recorded while being extended.
Only recording in the diagonal recording area 41 by the diagonal recording means 20 is performed, and the longitudinal recording areas by the longitudinal recording means 9, 16 are recorded from the recording end positions of the longitudinal recording areas 42, 43 by the longitudinal recording means 9, 16. Recording of 42 and 43 is started.

The magnetic recording apparatus of the present invention, as shown in FIGS.
Reference numeral 3 is for recording an absolute position on the magnetic tape 40 and / or a control signal of a drive means for running the magnetic tape.

[0015]

According to the present invention, the oblique recording means 2 is used for recording.
When the recording in the diagonal recording area 41 by 0 is finished, the longitudinal recording length X obtained by subtracting the recording end position in the longitudinal recording areas 42 and 43 from the absolute position on the magnetic tape 40 is a predetermined recording length. When the recording length X is less than Z, the control means 1 until the recording length X in the longitudinal direction reaches the predetermined recording length Z.
Since only the longitudinal recording areas 42 and 43 by the longitudinal recording means 9 and 16 are extended for recording, the minimum length Z of the joint interval between the longitudinal recording areas 42 and 43 can be secured, and the longitudinal recording areas. It is possible to ensure the operation of the magnetic recording device without impairing the reading at 42 and 43.

Further, according to the present invention, at the start of recording,
Until the recording end position where only the longitudinal recording areas 42 and 43 by the longitudinal recording means 9 and 16 have already been extended and recorded, the control means 1 causes the diagonal recording means 20 to record in the diagonal recording area 41. Only, and the longitudinal recording areas 42 and 43 by the longitudinal recording means 9 and 16 are
Since the recording of the longitudinal recording areas 42 and 43 by the longitudinal recording means 9 and 16 is started from the recording end position of 3, the use efficiency of the magnetic tape 40 can be improved.

Further, according to the present invention, since the longitudinal recording areas 42 and 43 record the absolute position on the magnetic tape 40 and / or the control signal of the driving means for moving the magnetic tape 40, the magnetic tape 40. The search operation for detecting the position of the magnetic tape 40 is ensured, and the traveling operation of the magnetic tape 40 can be further ensured.

[0018]

1 to 9 show the construction and operation of an embodiment of a magnetic recording apparatus according to the present invention. The embodiment of the present invention secures the operation of the magnetic recording device by ensuring the minimum length of the seam interval of the longitudinal tracks when the joint recording is performed on the magnetic tape.

First, before describing the embodiments of the present invention, the tape running mechanism and the tape format will be described. FIG. 2 is a diagram showing a tape running mechanism of a tape recorder used in an embodiment of the magnetic recording apparatus according to the present invention. Small cassette 22a or large cassette 2
When 2b is mounted on the tape recorder, the disk-shaped tape loading unit rotates, so that the tape guide 25 provided on the tape loading unit.
The a, 25b, 25c, 25d, 25e and 25f pull out the magnetic tape 23 from the cassette. The magnetic tape 23 pulled out from the cassette is composed of a rotating drum 21, a control and time code head 28, and an erasing head 30.
tape guides 26a, 26 so that they slidably contact a, 30b
The tape loading is completed by being supported by b, 26c, 26d, 27a and 27b. Then, the magnetic tape 23 is arranged so that the capstan 29 that rotates in conjunction with a driving motor (not shown) sandwiches the magnetic tape 23 between the capstan 29 and the pinch roller 24 that is made of an elastic material.
Run.

The tape guides 27a and 27b are configured to elastically rotate about one point by a driving solenoid (not shown) or the like.
A predetermined tension is applied to the magnetic tape when the No. 3 is run. The motor for driving the capstan 29 is controlled by a predetermined capstan servo. A solenoid for driving the tape guides 27a and 27b is controlled by a predetermined tension servo. Control signals for the servo system such as the capstan servo and the tension servo are recorded on a predetermined longitudinal track of the magnetic tape. The time code indicating the absolute position on the magnetic tape is recorded on a predetermined longitudinal track of the magnetic tape.

FIG. 3 is a diagram showing a rotary drum of an embodiment of the magnetic recording apparatus according to the present invention. Rotating drum 31
The recording heads 32a and 32b and the recording heads 32c and 32d are provided 180 degrees opposite each other in pairs of two channels at the disk-shaped peripheral end. Also,
Reproducing heads 33a, 33b and recording heads 33c, 3
3d are provided so that two pairs of two channels face each other by 180 degrees. Further, erasing heads 34a and 34b are provided 180 degrees opposite to each other.

FIG. 4 is a diagram showing a tape format of an embodiment of the magnetic recording apparatus according to the present invention. User data is recorded on the magnetic tape 40 on a helical track 41 which is recorded in a direction oblique to the tape running direction. A control signal of the capstan servo is recorded on the control track 42 recorded in the longitudinal direction of the upper end portion of the magnetic tape 40. A time code indicating the absolute position on the magnetic tape is recorded on the time code track 43 recorded in the longitudinal direction at the lower end of the magnetic tape 40.

Next, the construction and operation of the embodiment of the present invention will be described on the premise of such a tape running mechanism and tape format. 1 is a block diagram showing the configuration of an embodiment of a magnetic recording apparatus according to the present invention. FIG.
In, the controller 1 includes a CPU, a ROM and an R
It is composed of an AM, and particularly has a longitudinal outpoint memory 2, a longitudinal inpoint memory 3, a helical outpoint memory 4, and a helical inpoint memory 5.

The longitudinal out-point memory 2 is a memory for storing the recording end position of the longitudinal track, and the longitudinal in-point memory 3 is a memory for storing the recording start position of the longitudinal track. The longitudinal track consists of a control track 42 and a time code track 43, as shown in FIG. The helical out point memory 4 is a memory for storing the recording end position of the helical track 41, and the helical in point memory 5 is a memory for storing the recording start position of the helical track 41. As described above, the controller 1 independently has the longitudinal in-point memory 3 for storing the in-point indicating the recording start point of the longitudinal track and the helical in-point memory 5 for storing the in-point indicating the recording start point of the helical track. are doing. Similarly, a longitudinal out point memory 2 for storing an out point indicating a recording end point of a longitudinal track and a helical out point memory 4 for storing an out point indicating a recording end point of a helical track are independently provided.

At the time of recording the time code, the longitudinal out point or the longitudinal in point is supplied from the longitudinal out point memory 2 or the longitudinal in point memory 3 of the controller 1 to the time code generator 6. The time code generator 6 supplies a predetermined time code obtained by modulating a clock to the recording amplifier 7. The recording amplifier 7 amplifies the time code for recording and supplies it to the time code head 9 via the switch 8. In this way, the time code is recorded on the time code track. At this time, the recording enable signal and the recording switch control signal are supplied from the controller 1 to the recording amplifier 7 and the switch 8.

At the time of reading the time code, the time code signal read from the time code track by the time code head 9 is supplied to the reproducing amplifier 10 via the switch 8. A reproduction switch control signal is supplied from the controller 1 to the switch 8. The reproduction amplifier 10 amplifies the time code signal for reproduction and supplies it to the time code reader 11. The time code reader 11 demodulates the time code from the time code signal. The time code read by the time code reader 11 is supplied to the longitudinal out point memory 2 or the longitudinal in point memory 3 of the controller 1. The longitudinal out point memory 2 or the longitudinal in point memory 3 records a longitudinal out point or a longitudinal in point.

At the time of recording the control signal, the detection signal such as the motor rotation speed or the tension from the servo control unit 12 such as the capstan servo or the tension servo is supplied to the control signal generator 13. The control signal generator 13 generates a predetermined control signal from the detection signal and supplies it to the recording amplifier 14. The recording amplifier 14 amplifies the control signal for recording and transmits it to the control head 16 via the switch 15.
Supply to. In this way, the control signal is recorded on the control track. At this time, the recording amplifier 14
A recording enable signal and a recording switch control signal are supplied from the controller 1 to the switch 15.

When reading the control signal,
The control signal read from the control track by the control head 16 is supplied to the reproduction amplifier 17 via the switch 15. A reproduction switch control signal is supplied from the controller 1 to the switch 15. The reproduction amplifier 17 amplifies the time code signal for reproduction and supplies it to the control signal detector 18. The control signal detector 18 supplies a control signal to the servo control unit 12.

At the time of recording user data, recording data supplied from a host computer (not shown) is supplied to the recording amplifier 19. The recording amplifier 19 amplifies recording data for recording and supplies it to the recording head 20.
In this way, the record data is recorded on the helical track. The recording head 20 is mounted on the rotary drum as shown in FIGS. The reproduction system for user data is omitted.

Next, the operation of the embodiment of the present invention will be described. The operation of the embodiment of the present invention is divided into two processes, a process at the end of recording and a process at the start of recording. In order to carry out recording with track continuity by assembling recording from the state of the virgin tape where nothing is recorded, first, so-called crash recording without specifying the in-point as the recording start point is performed and the second recording is performed. From the recording, assemble recording is performed with the inpoint specified. At the time of starting the crash recording, recording on the helical track and the longitudinal track is started from the same position as in the conventional recording. In this case, the time code values of the helical in-point and the longitudinal in-point are stored in the helical in-point memory and the longitudinal in-point memory, respectively.

FIG. 5 is a flow chart showing the operation at the end of recording in the magnetic recording apparatus according to the embodiment of the present invention. In FIG. 5, first, in step S1, the controller 1
By supplying the recording end command to the recording enable signal of the helical data recording amplifier in step S2, the recording of the helical track is ended.
In step S3, the time code value of the out point of the helical track is stored in the helical out point memory. The value of the out point is set to the time code of the actual recording end position plus 1 from the relationship of the in point of the next recording.

In step S4, the value of the helical out point memory is set in the helical in point memory for use at the start of the next joint recording. Step S5
If longitudinal recording is not performed, step S1
At 0, the tape stop control is performed and the process ends. When longitudinal recording is performed in step S5, the longitudinal recording length X is obtained by subtracting the longitudinal in-point value from the time code value of the time code generator (TCG) at that time in step S6. . In step S6, the longitudinal recording length X is compared with the minimum joint distance Z that can be corrected by the longitudinal signal processing, and longitudinal recording is continued until the longitudinal recording length X becomes equal to or larger than the minimum joint distance Z.

In step S6, when the longitudinal recording length X is already equal to or larger than the minimum joint gap Z, or when the longitudinal recording is continued and the longitudinal recording length X reaches the minimum joint gap Z, the recording amplifier 7 is operated in step S7. And recording amplifier 1
The recording enable signal of No. 4 is controlled to end the longitudinal recording. In step S8, the value of the time code of the longitudinal out point is stored in the longitudinal out point memory.
In step S9, the value of the time code in the longitudinal out-point memory is set in the longitudinal in-point memory. In step S10, the tape stop control is performed and the process ends. By performing such processing, the recording length of the long track always becomes equal to or larger than the minimum joint interval Z.

FIG. 6 is a flow chart showing the operation at the start of recording in the embodiment of the magnetic recording apparatus according to the present invention. The flowchart shown in FIG. 6 is an operation for recording with continuity with respect to the helical out point and the longitudinal out point in the flowchart shown in FIG. In FIG. 6, by supplying a recording start command to the controller 1 in step S20, tape running is started in step S21.

In step S22, the value of the time code of the time code reader, that is, the current tape position is compared with the value of the helical in point. Step S22
When the current tape position reaches the value of the helical in point, the controller 1 supplies a recording enable signal to the helical recording amplifier 19 to start recording in step S23.

When the controller 1 receives the recording end command in step S24, recording end processing is performed in step S25. When the controller 1 does not receive the recording end command in step S24, step S2
At 6, the time code value of the time code reader, i.e. the current tape position, is compared to the value of the longitudinal in point. In step S26, if the current tape position does not reach the value of the longitudinal in-point, the process returns to step S24. When the current tape position reaches the longitudinal in-point value in step S26, the controller 1 supplies a recording enable signal for the recording amplifier 7 and the recording amplifier 14 to start longitudinal recording and then ends. To do.

Next, the operation on the magnetic tape will be described with reference to FIGS. 7A to 7C. FIG. 7A is a diagram for explaining the operation of the embodiment of the magnetic recording apparatus according to the present invention when the recording length is equal to or more than the minimum joint interval Z frame. In FIG. 7A, the magnetic tape 70 includes a helical track 74, a time code track 73 and a control track 75.
Is provided. The helical in point and the longitudinal out point 71 are the same, and the helical out point and the longitudinal out point 72 are the same. In this case, the helical in point and the longitudinal in point 7
Since the recording length from 1 to the helical out point and the longitudinal out point 72 is equal to or more than the minimum joint interval Z frame, the recording is not extended.

FIG. 7B is a diagram for explaining the operation of the magnetic recording apparatus according to the embodiment of the present invention when the recording length is less than the minimum joint interval Z frame. In FIG. 7B, the helical in-point and the longitudinal in-point 81 are the same, but when the recording length from the helical in-point 81 to the helical out-point 82 is less than the minimum joint interval Z frame, only the longitudinal out-point 83 is the minimum joint interval. Record up to Z frames by assembling recording.

FIG. 7C is a diagram for explaining the operation when the helical in point, the helical out point, the longitudinal in point, and the longitudinal out point are all different in the embodiment of the magnetic recording apparatus according to the present invention. In FIG. 7C, when the helical in-point 91 and the longitudinal out-point 92 are different and the helical out-point 93 and the longitudinal out-point 94 are different, the recording length from the helical in-point 91 to the helical out-point 93 is less than the minimum joint interval Z frame. Regardless of this, when the recording length from the longitudinal in-point 92 to the longitudinal out-point 94 is less than the minimum joint interval Z frame, only the longitudinal out-point 94 is extended to the minimum joint interval Z frame by assembling recording. To do so. The minimum joint interval Z frame is
About 29 IDs are sufficient, but about 7 to 10 IDs may be used.

According to the above example, when recording on the helical track 41 as an oblique recording area by the recording head 20 as oblique recording means at the time of recording, longitudinal recording is performed from the absolute position on the magnetic tape 40. Control track 42 and time code track 43 as areas
When the recording length X in the longitudinal direction obtained by subtracting the recording end position is less than the predetermined recording length Z, the longitudinal recording is performed by the controller 1 as the control means until the longitudinal recording length X reaches the predetermined recording length Z. Only the time code head 9 as a means, the control track 42 as a longitudinal recording area by the control head 16, and the time code track 43 are extended and recorded, so that the control track 42 and the time code track 43 as a longitudinal recording area are recorded. It is possible to secure the minimum length Z of the seam interval, the reading on the control track 42 and the time code track 43 as the longitudinal recording area is not impaired, and the operation of the magnetic recording device can be ensured.

Further, according to the present invention, at the start of recording,
The time code head 9 as the longitudinal recording means, the control track 42 as the longitudinal recording area by the control head 16, and the time code track 43 alone are extended and recorded up to the recording end position. 1, recording only on the helical track 41 as the diagonal recording area by the recording head 20 as the diagonal recording means,
The time code head 9 as the longitudinal recording means, the control track 42 as the longitudinal recording area by the control head 16, and the control track as the longitudinal recording area by the longitudinal recording means 9 and 16 from the recording end position of the time code track 43. Since the recording of the time code track 42 and the time code track 43 is started, the use efficiency of the magnetic tape 40 can be improved.

Further, according to the present invention, the control track 42 and the time code track 43 as the longitudinal recording area are the absolute position on the magnetic tape 40 and / or the control signal of the drive means for running the magnetic tape 40. Since the data is recorded, the search operation for detecting the position of the magnetic tape 40 can be ensured, and the running operation of the magnetic tape 40 can be ensured.

According to the above example, the invention can be applied to any helical scan type tape recorder such as a video tape recorder and a data recorder. In this case, since the longitudinal joint can be set to have a certain interval or more, it is possible to prevent the time code reading failure and the abnormal operation due to the inability to detect the control signal. Particularly, in the case of assemble recording in the data streamer, since data recording in units of 1ID is possible, recording of padding data or the like becomes unnecessary, and the tape usage efficiency can be improved.

[0044]

According to the present invention, when the recording in the diagonal recording area by the diagonal recording means is completed at the time of recording,
When the recording length in the longitudinal direction obtained by subtracting the recording end position in the recording region in the longitudinal direction from the absolute position on the magnetic tape is less than the predetermined recording length, the control means until the recording length in the longitudinal direction reaches the predetermined recording length. Since only the longitudinal recording area by the longitudinal recording means is extended for recording, the minimum length of the joint interval of the longitudinal recording areas can be secured, and reading in the longitudinal recording areas is not impaired.
The operation of the magnetic recording device can be ensured.

Further, according to the present invention, at the start of recording,
Until the recording end position at which only the longitudinal recording area of the longitudinal recording means has already been extended and recorded, the control means records only the diagonal recording area by the diagonal recording means, and the longitudinal recording means performs recording. Since the recording of the longitudinal recording area by the longitudinal recording means is started from the recording end position of the longitudinal recording area, the use efficiency of the magnetic tape can be improved.

Further, according to the present invention, the longitudinal recording area records the absolute position on the magnetic tape and / or the control signal of the driving means for running the magnetic tape.
The search operation for detecting the position of the magnetic tape is ensured, and the operation of running the magnetic tape can be ensured.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a magnetic recording apparatus of the present invention.

FIG. 2 is a diagram showing a tape running mechanism of a tape recorder used in an embodiment of the magnetic recording apparatus of the present invention.

FIG. 3 is a diagram showing a rotary drum of an embodiment of the magnetic recording apparatus of the present invention.

FIG. 4 is a diagram showing a tape format of an embodiment of the magnetic recording apparatus of the present invention.

FIG. 5 is a flow chart showing the operation at the end of recording in the embodiment of the magnetic recording apparatus of the present invention.

FIG. 6 is a flowchart showing the operation at the start of recording in the embodiment of the magnetic recording apparatus of the present invention.

FIG. 7 is a diagram showing an operation of an embodiment of the magnetic recording apparatus of the present invention, and FIG. 7A shows a case where the recording length is Z frames or more,
7B is a diagram showing a case where the recording length is less than Z frames, and FIG. 7C is a diagram showing a case where the helical in point, the helical out point, the longitudinal in point, and the longitudinal out point are all different.

[Explanation of Codes] 1 Controller 2 Longitudinal Outpoint Memory 3 Longitudinal Inpoint Memory 4 Helical Outpoint Memory 5 Helical Inpoint Memory 6 Time Code Generator 7 Recording Amplifier 8 Switch 9 Time Code Head 10 Playback Amplifier 11 Time Code Reader 12 Servo control unit 13 Control signal generator 14 Recording amplifier 15 Switch 16 Control head 17 Playback amplifier 18 Control signal detector 19 Recording amplifier 20 Recording head 21 Rotating drum 22a Cassette 22b Cassette 23 Magnetic tape 24 Pinch roller 25a Tape guide 25b Tape guide 25c Tape guide 25d Tape guide 25e Tape guide 25f Tape guide 26a Tape guide 26b Tape guide 2 6c tape guide 26d tape guide 27a tape guide 27b tape guide 28 control head and time code head 29 capstan 30a erasing head 30b erasing head 31 rotating drum 32a recording head 32b recording head 32c recording head 32d recording head 33a reproducing head 33b reproducing head 33c Play head 33d Play head 34a Erase head 34b Erase head 40 Magnetic tape 41 Helical track 42 Control track 43 Time code track 70 Magnetic tape 71 Helical in point, Long in point 72 Helical out point, Long out point 80 Magnetic tape 81 Helical in point , Longitudinal in point 82 Helical out point 83 Longitudinal out point 0 magnetic tape 91 Helical In point 92 longitudinal in point 93 helical-out point 94 longitudinal Out Point

Claims (3)

[Claims] 1. A diagonal recording means scans the magnetic tape diagonally with respect to the running direction of the magnetic tape to record data on the magnetic tape diagonally with respect to the longitudinal direction of the magnetic tape. A diagonal recording area, and longitudinal recording means for scanning the magnetic tape in the running direction of the magnetic tape to record at least an absolute position on the magnetic tape in the longitudinal direction of the magnetic tape. In a magnetic recording / reproducing apparatus for performing recording in a recording format having a longitudinal recording area, at least recording end position storage means for storing a recording end position in the longitudinal recording area, and oblique recording by the oblique recording means. An area and or control means for controlling the recording operation in the longitudinal recording area by the longitudinal recording means, When recording in the diagonal recording area by the diagonal recording means at the time of recording, the longitudinal recording length obtained by subtracting the recording end position in the longitudinal recording area from the absolute position on the magnetic tape is When the longitudinal recording length is less than the predetermined recording length, the control means extends and records only the longitudinal recording area by the longitudinal recording means until the longitudinal recording length reaches the predetermined recording length. Characteristic magnetic recording device. 2. The magnetic recording apparatus according to claim 1, wherein the recording end position storage means stores the recording end position in the diagonal recording area and / or the longitudinal recording area, and at the start of recording, Until the recording end position where only the longitudinal recording area by the longitudinal recording means is already extended and recorded, the control means performs only recording in the oblique recording area by the oblique recording means, A magnetic recording apparatus, wherein recording is started in the longitudinal recording area by the longitudinal recording means from a recording end position in the longitudinal recording area by the longitudinal recording means. 3. The magnetic recording device according to claim 1, wherein the longitudinal recording area is for recording an absolute position on the magnetic tape and / or a control signal of a driving means for running the magnetic tape. A magnetic recording device characterized by: