JPH07230612A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve the reliability of a system by adding one head to the device, thereby permitting monitoring of a recording state and substituting of a head when recording is infeasible. CONSTITUTION:This recording and reproducing device executes reproducing and/or recording of respectively different tapes 2A, 2B recorded with at least two formats with one tape traveling system and one rotary drum device 1. The rotary drum device 1 has a means for recording the first format with the first head HA and second head HB arranged to face each other at about 180 deg. or a means for reproducing the tape 2A recorded with the first format. The rotary drum device 1 has also a means for recording the second format with the third head HA' arranged within 90 deg. in rotating phase with the second head HB or a means for reproducing the tape 2B recorded with the second format thereupon. As a result, the probability of the recording failure at the time of, for example, automatic answering recording is substantially lowered and the reliability of the system is enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head mounted on a rotary drum device used in a recording / reproducing apparatus such as a VTR, and more particularly to a method of mounting the head on the rotary drum device and a system using the same. Regarding

[0002]

2. Description of the Related Art In recent years, VHS system and H
W-VHS combined with D method or analog V
Compatible system such as HS and digital VHS,
Tapes recorded in two or more different formats,
A compatible system capable of reproducing or recording with one tape running system and one rotating drum device has been proposed.

Conventionally, in order to realize such a compatible system, for example, a method of changing the number of rotations of a rotary drum device to cope with different data transfer rates, or a number of heads required for each system is set to the number of rotary drums. It was one of the methods of mounting on the device. This kind of technology
JP-A-59-172101, JP-A-62-264
No. 417 publication.

[0004]

In the above-mentioned prior art, the first method for realizing the compatible system, which is the first method for changing the number of rotations of the rotary drum device to cope with different data transfer rates, has different rotation speeds. The system needs to satisfy the head contact,
It is technically very difficult and makes the system unreliable.
On the other hand, in the method of mounting the number of heads on the rotary drum device by the number required for each system, the number of heads naturally increases, resulting in cost increase.

An object of the present invention is to provide a recording / reproducing apparatus having a head and a mounting method thereof, which solve the above problems.

[0006]

In order to achieve the above object, a pair of first and second heads having different azimuth angles, which are arranged to face each other by about 180 degrees, are arranged on a rotary drum device.
A tape recorded in two formats is reproduced or recorded by a pair of a second head and a third head which is arranged within 90 degrees in rotational phase and has a different azimuth angle from the first head.

The rotation speed of the rotary drum device is adjusted to the system having the highest data transfer rate of the two formats. In the case of a system with a slower data transfer rate, the tape feeding speed is reduced while keeping the rotation speed unchanged.

[0008]

The pair of first and second heads having different azimuth angles, which are arranged to face each other by about 180 degrees, and the second head are arranged within 90 degrees in rotational phase with respect to the second head.
Moreover, by reproducing or recording a tape recorded in two formats with a pair of a third head having a different azimuth angle from the first head, the number of heads can be reduced and the cost can be reduced. The rotation speed of the rotary drum device is adjusted to a system having a higher data transfer rate of the two formats, and for a system having a lower data transfer rate, the rotation speed is kept unchanged and the tape feeding speed is reduced. As a result, by matching the head contact to a system having a high rotation speed, proper contact is achieved in both systems, and the system reliability is increased.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1A shows the head arrangement on the rotary drum. In the figure, in the system of the reproducing head or the recording / reproducing head,
The first head HA and the second head HB are paired to perform reproduction or recording of the first system. Further, the third head HA 'and the second head HB are paired to perform recording or reproduction of the second system. Here, the first head HA and the second head HB have a rotational phase θ1 (θ1≈18).
0 °), and the third head H
A ′ and the second head HB have a rotational phase θ2 (θ2 = 1 °
~ 90 °). In the figure, the first to third heads each consist of one head, but the present invention is not limited to this, and each head is
A double azimuth head or a multi-channel head may be used. A flying erase head may be mounted depending on the system. Although two track patterns with different azimuth angles of a magnetic head using a magnetic core are shown in the drawing, a system using an optical head may be used as the head. FIG. 1B shows a state in which the tape recorded by the first system is reproduced by the first head HA and the second head HB. Although the reproduction state is shown here, the first head HA and the second head HB may be used for recording. The tape feed speed in the first system is (T = a). FIG. 1C shows a recording method in the second system. At this time, the scanning speed of the head is almost equal to the scanning speed of the head in the first system. First, the third head HA 'records the track TA. At this time, since the second head HB traces almost the same position as the third head HA ', the recording signal is not applied. Next, while the second head HB leaves the tape and spins about 180 °, the tape moves by T = [180 / (360−θ2)] × a, and the second head HB starts recording. . At this time, the recording signal is not applied to the third head HA 'tracing the front of the second head HB. Although the recording state is shown in the figure, the third head HA ′ and the second head HB may be used for reproduction. As can be seen from the above, the number of heads need only be less than or equal to the number required for the system even when recording and reproducing in different systems. Further, since it is possible to deal with a system having a different data transfer speed by simply changing the tape feed speed at the same drum rotation speed, it is easy to determine the condition of the head contact.

Another embodiment of the present invention will be described with reference to FIG. FIG. 2A shows the head arrangement on the rotary drum. In the figure, in the system of the reproducing head or the recording / reproducing head,
The first head HA and the second head HB are paired to perform reproduction or recording of the first system. Further, the third head HA 'and the second head HB are paired to perform recording or reproduction of the second system. Further, the first head HA and the fourth head HB 'are paired to monitor the recording state of the second system. For example, either the third head HA' or the second head HB is used. , Or both become unrecordable, the first head HA and the fourth head HB ′ perform recording by the new second system in pairs. Here, the first head HA and the second head H
B, the third head HA 'and the fourth head HB' are attached at a rotational phase θ1 (θ1≈180 °), respectively, and the third head HA 'and the second head H'
B is attached at a rotational phase θ2 (θ2 = 1 ° to 90 °). In the drawing, the first to fourth heads each consist of one head, but the heads are not limited to this, and each head may be a double azimuth head or a multi-channel head. A flying erase head may be mounted depending on the system.
Although two track patterns with different azimuth angles of a magnetic head using a magnetic core are shown in the drawing, a system using an optical head may be used as the head. FIG. 2B shows a state where the tape recorded by the first system is reproduced by the first head HA and the second head HB. Although the reproduction state is shown here, the first head HA and the second head HB may be used for recording. The tape feed speed in the first system is (T = a).
FIG. 2C shows a recording method in the second system. The third head HA 'records the track TA. At this time, since the second head HB traces almost the same position as the third head HA ', the recording signal is not applied.
Furthermore, with the phase delayed by about 180 °, the first head HA,
The fourth head HB 'traces a position displaced by almost a half track. At this time, the first head HA is the third head H
Monitor the recording status of A '. Since this head merely monitors the recording state, there is no problem even if the track shifts by half a track. Next, while the second head HB leaves the tape and spins about 180 °, the tape moves by T = [180 / (360−θ2)] × a, and the second head HB starts recording. . At this time, the recording signal is not applied to the third head HA 'tracing the front of the second head HB. further,
At a phase delayed by about 180 °, the first head HA and the fourth head HB ′ trace the positions shifted by about half a track,
This time, the fourth head HB 'monitors the recording state of the second head HB. Although the recording state is shown in the figure, the third head HA 'and the second head HB can also be used for reproduction.

In FIG. 3, for example, when the third head HA 'becomes unrecordable, the first head HA and the fourth head HB' are paired to perform a new recording of the second system. Show the method. FIG. 3A shows a recording method in the second system. The third head HA 'records the track TA. At this time, since the second head HB traces almost the same position as the third head HA ', the recording signal is not applied. For example, if the third head HA ′ becomes unrecordable during recording for some reason, the first head HA monitoring the recording senses a recording failure. In this case, the second head HB stops recording, traces as it is, and the fourth head HB ′ having a phase delayed by about 180 ° records the track TB at a position shifted by about a half track. Further, the first head HA then stops the recording monitor, and the track TA is recorded instead of the third head HA '. According to such a method, a part of the recording track is lost, but the image quality does not deteriorate to a problem. Also, the recording trace deviates from the middle by about a half track, which is a range that can be covered by the conventional auto-tracking. For example, the probability of unrecording at the time of absence recording can be significantly reduced, and the reliability of the system can be significantly improved. In addition, the cost increase due to the above method is
Since the recording / reproducing system circuit can be used as it is, only the fourth head HB ′ and the head switching system need be changed.

Another embodiment of the present invention will be described with reference to FIGS. FIG. 4A shows the head arrangement on the rotary drum.
In the figure, the configuration is almost the same as in FIG. 2A, but in this configuration, the first head HA and the fourth head HB 'are mounted on a moving device that is movable in the direction perpendicular to the track trace direction. . This makes it possible to correct the track deviation that has occurred in FIG. Figure 4
(B) shows a state in which the tape recorded by the first system is being reproduced by the first head HA and the second head HB. The tape feed speed in the first system is (T = a). FIG. 4C shows the recording method in the second system. The third head HA 'records the track TA. At this time, since the second head HB traces almost the same position as the third head HA ', the recording signal is not applied. Further, the first head HA monitors the recording state of the third head HA 'at a phase delayed by about 180 °. Since this head is mounted on a moving device that can move in the direction perpendicular to the track trace direction, track deviation can be corrected. Next, while the second head (HB) leaves the tape and spins about 180 °, the tape moves by T = [180 / (360-θ2)] × a, and the second head HB records. Start. At this time, the recording signal is not applied to the third head HA 'tracing the front of the second head HB. further,
At a phase delayed by about 180 °, the fourth head HB 'monitors the recording state of the second head HB while correcting the track deviation. In FIG. 5, for example, the third head H
The following is a coping method when A'becomes unrecordable. Similar to FIG. 3, for example, when the third head HA ′ becomes unrecordable during recording for some reason, the first head HA that is recording and monitoring senses a recording failure. In this case, the second head HB stops recording and traces as it is, and the fourth head HB ′ having a phase delayed by about 180 ° records the track TB while correcting the track deviation. further,
Next, the first head HA stops the recording monitor, and the track TA is recorded instead of the third head HA '.
According to this method, since the track deviation can be corrected, the accuracy of the recording monitor is high and the recording pattern is not displaced.
Furthermore, by combining the above method with, for example, a memory so that one track is always recorded in the memory, the head can be moved to an unrecordable track, information can be recorded from the memory, and the loss of recording as shown in FIG. 5 is eliminated. You can

Although FIG. 4 shows a system in which the moving device is mounted only on the first head HA and the fourth head HB ', the present invention is not limited to this, and the second head HB opposed by 180 ° is shown. Also, a moving device may be mounted on the third head HA '. As a result, the head tracing accuracy can be made higher.

In addition, for example, when the second format has a higher data transfer rate than the first format and cannot be handled by a pair of heads of the second and third heads HB and HA ', the first and fourth heads can be used. Head HA, HB '
It is also possible to perform recording and reproduction by a total of four heads, a pair of the head and the second and third heads HB and HA '. Also in the above method, the number of heads required for recording / reproducing in different systems may be less than or equal to the number required for the system, and the system cost can be reduced. Furthermore, in a system corresponding to three different formats, recording / reproduction of the first format is performed by the first and second heads HA and HB, and recording / reproduction of the second format is performed by the second and third heads HB, HB. HA 'is performed, and recording / reproduction of the third format is performed by a pair of first and fourth heads HA and HB' and a pair of second and third heads HB and HA ', that is, a total of four heads. To Even in this case, the number of heads required for recording / reproducing in different systems is equal to or less than the number required for the system, and the system cost can be reduced. In this case, for example, the third head HA 'and the fourth head HB' may each be individually equipped with a moving device. By doing so, the head trace position can be made highly accurate independently of each system.

In the above embodiment, the system for recording and reproducing video is described, but the system is not limited to this, and for example, information is recorded and reproduced by a data recorder used in a computer or the like, a device for recording and reproducing audio or the like. Any system will do.

[0016]

Since the present invention is constructed as described above, it has the following effects.

First, as described above, even in recording / reproducing of different systems, the number of heads need only be less than the number required for the system, so the system cost can be reduced. Also, since it is possible to support a system with different data transfer rates by simply changing the tape feed speed with the same drum rotation speed, it is easy to set the conditions for head contact and the system reliability is increased.

Further, by adding only one head, the recording state can be monitored and the head can be used when recording is not possible. For example, the probability of recording failure during absence recording can be considerably reduced, so that the reliability of the system is improved. Sexuality goes up. Further, the cost increase associated with the above method is only one head and the method of switching the head switching, and the cost performance is high.

[Brief description of drawings]

FIG. 1 is a head layout and head trace diagram of an embodiment of the present invention.

FIG. 2 is a head layout and head trace diagram of another embodiment of the present invention.

FIG. 3 is a diagram showing a recording monitor and a recording switching method.

FIG. 4 is a head layout and head trace diagram of another embodiment of the present invention.

FIG. 5 is a diagram showing a recording monitor and a recording switching method.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Rotating drum device, 2 ... Tape, 2A ... 1st system tape, 2B ... 2nd system tape, HA ... 1st head, HB ... 2nd head, HA '... 3rd head, HB '... Fourth head, TA ... Tracks recorded / reproduced by the first head or third head, TB ... Tracks recorded / reproduced by the second head or fourth head.

Claims (8)

[Claims] 1. Recording capable of reproducing and / or recording different tapes (2A, 2B) recorded in at least two formats by one tape running system and one rotary drum device (1). In a reproducing apparatus, a first head (HA) and a second head (H) which are arranged to face the rotary drum device (1) by approximately 180 degrees.
B) means for recording the first format or means for reproducing the tape (2A) recorded in the first format, and the second head (H) on the rotary drum device (1).
B) and the third head (HA ') arranged within 90 degrees in the rotational phase, the means for recording the second format or the means for reproducing the tape (2B) recorded in the second format. A recording / reproducing apparatus having. 2. A fourth head (HB ') is disposed in the rotary drum device (1) at a position facing the third head (HA') by approximately 180 degrees, and the fourth head (HB ') is facing the 180 degrees. With the first head (HA) and the second head (HB),
Means for recording / reproducing the first format, means for recording / reproducing the second format with the second head (HB) and third head (HA '), and the first head (HA) 2. The recording / reproducing apparatus according to claim 1, further comprising means for monitoring the recording states of the second head (HB) and the third head (HA ') with the fourth head (HB'). 3. The first head when either or both of the second head (HB) and the third head (HA ') are in an unrecordable state during recording in the second format. 2. A method according to claim 1, wherein either (HA) or the fourth head (HB ') or both have means for substituting for recording in the second format.
Alternatively, the recording / reproducing apparatus according to claim 2. 4. One or both of the first head (HA) and the fourth head (HB ′) has a structure capable of moving its scanning position perpendicularly to the scanning direction. Claim 1 or Claim 2 characterized in that
The recording / reproducing apparatus described. 5. A combination of the first head (HA) and the fourth head (HB ') and a combination of the second head (HB) and the third head (HA'), 3. The recording / reproducing apparatus according to claim 1 or 2, further comprising means for recording / reproducing the format. 6. When recording or reproducing in the second format, one or both of the second head (HA ') and the fourth head (HB') change their scanning positions with respect to the scanning direction. The recording / reproducing apparatus according to claim 1 or 2, wherein the recording / reproducing apparatus has a structure capable of moving vertically. 7. At least two or more heads among the first to fourth heads are head assemblies having at least two or more gaps and capable of reproducing or recording two or more recording tracks. The recording / reproducing apparatus according to claim 1 or 2, which is characterized. 8. A system for recording / reproducing in different formats, wherein the rotational speed of the rotary drum is substantially constant regardless of the system, and the tape feeding speed is different depending on the system. 2. The recording / reproducing apparatus according to 2.