JPH0294001A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To simplify the tape loading mechanism by coiling a tape horizontally (not slantingly) to a rotation magnetic head device, traveling it and dislocating a magnetic head at a constant interval in a tape width direction for one rotation. CONSTITUTION:A tape 1 is pulled out from a cassette, coiled horizontally to a rotation magnetic head device (rotation cylinder 2) and travelled in the same plane. Consequently, a tape travelling system becomes very simple. A window 5 is provided at a rotation cylinder 2, magnetic heads 6 and 7 are protruded from the window 5 and the tape 1 is scanned in the same direction as the traveling direction of the tape 1. Then, rotation magnetic heads 6 and 7 are moved in the shaft direction of the cylinder 2 only by the track pitch quantity for one rotation, the sum of the movement arrives at a prescribed value, and then, the rotary head is returned to the original height and the place of the first height is scanned again. Thus, the tape traveling system can be tape loading mechanism are very easy and the good accuracy tape traveling can be executed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a signal recording and reproducing apparatus using a magnetic tape.

[Conventional technology]

Conventionally, as a magnetic recording and reproducing device for television signals, data signals, and PCM audio signals, a tape is spirally wound around a rotating magnetic head device (cylinder) to form a scanning locus (recording trunk) diagonal to the tape running direction. Helical scan magnetic recording and reproducing devices were mainly used in the US. However, the helical scan magnetic recording device has a complicated tape running system, and the tape loading mechanism is therefore unsuitable for high-speed tape running, making the device smaller and thinner, and is expensive. There are problems such as: As a tape scanning method other than the helical scan, a scanning method such as that described in Japanese Patent Application Laid-open No. 149306/1983 was devised, in which the head is fixed, the tape is wound endlessly around a cassette, and the tape is run at high speed. . However, in this method, the endless tape must be run at extremely high speeds, which causes problems with the chive drive system and the running system.

[Problem to be solved by the invention]

The present invention has been devised to solve these problems in the tape running system and the complexity of the tape loading mechanism.

[Means to solve the problem]

In the present invention, the above-mentioned problem is solved by running the tape horizontally on the same plane when wrapping the tape around the rotating magnetic head device without changing its height. The present invention is characterized in that the recording trunk is aligned with the tape running direction by spacing the rotating magnetic head at a constant interval in the tape width direction for each rotation.

[Effect]

In the present invention, the tape is pulled out from the cassette force S and wound around the rotating magnetic head device. Since the tape can be wound without changing its height, the tape runs eight times in the same plane, similar to an audio tape recorder.This makes the tape running system extremely simple.

The rotating head therefore scans the tape in the same direction as the tape travel direction. At this tt, the same position t is to be scanned, so the rotary head is moved in the direction of the rotation axis by the trunk pitch amount every rotation.

When the sum of these movements reaches a predetermined value, the rotary head is returned to its original height and the location at the initial height is scanned again. At this time, if the distance traveled by the tape in the time it takes to reach this predetermined amount of movement is longer than the length of the recording track (scanning trace) in the running direction, the scanning traces will not overlap and the recording and playback of the signal will not be possible. It can be carried out.

〔Example〕

An embodiment of the present invention will be described with reference to FIGS. 1 to 5.

FIG. 2 is a diagram showing a state in which a tape is wound around the rotary magnetic head device, which is the main part of the present invention. 1 is a magnetic tape, 2 is a rotating cylinder, and 6 is a fixed cylinder. How to support a rotating cylinder.

The driving method is shown in FIG. 4, and is the same as that of a rotating magnetic head device of a normal helical scan VTR.

The outer circumferential portion of the lower cylinder 6 has steps with different diameters, and these portions form the lead portions 4 of the same height. As shown in the figure, the lower end of the magnetic tape 1 is pressed against and guided by the lead portion 4. Therefore, the magnetic tape 1 is wound horizontally around the rotating magnetic head device t (cylinder). A window 5 is opened, and a rotary magnetic head 6.7 protrudes from this portion, contacts the magnetic tape 1, and scans it.

A head holding member 9 supports the rotating magnetic head 6.7. Reference numeral 8 denotes a leaf spring to which a head holding member is attached, and this will be explained later.

FIG. 6 schematically shows the tape running system of this embodiment.

This diagram is very similar to that of a helical scan magnetic recording/reproducing device. However, in reality, each tape guide only needs to move horizontally, and there is no inclined guide, so the running system is extremely simple.

Before tape loading, the magnetic tape 1 is wound from the supply reel 16 in the tape cassette 15 to the take-up reel 17.
is attached to the cassette opening. During tape loading, the tape guide 18 located in the cassette opening 21.
19 moves in the direction of the arrow in the figure, pulls out the tape, and rotates the rotating cylinder 2. Then, the magnetic tape 1 is wound around the fixed cylinder 6.

18' and 19' indicate the position of each tape guide upon completion of loading. The magnetic tape 1 is wound around a rotating cylinder 2° and a fixed cylinder 5 by more than 180°. As shown in FIG. 2, since the lower end of the magnetic tape is regulated in the cylinder section, the tape guides 18 and 19
By restricting the upper end of the magnetic tape 18, the magnetic tape 18 can be kept in the correct position while running against the cylinder f.

Although the rotating magnetic heads 6 and 78 were explained in FIG. 2, a rotating magnetic head 15 and 14 is supported on the rotating cylinder 2 at a position 180 degrees opposite to these, similar to the rotating magnetic head 6.7. Although the tape running drive mechanism is not clearly shown in FIG. 6, for example, a reel drive motor directly connected to the supply reel 169 and take-up reel 17 axis is provided, and by controlling these, the tape is run at a constant speed and constant tension. Known techniques are applicable. Although not shown in the drawings, it is of course possible to apply a normal tape running drive mechanism equipped with a pinch roller and a capstan.

Next, the tape is scanned by a rotating magnetic head (this will be discussed below. The recording track pattern recorded on the magnetic tape 1 is shown in Fig. 1. Fig. 1 is a view of the magnetic tape 1 viewed from the magnetic side. The rotating cylinder 2 rotates at a constant rotation speed, and the magnetic tape 1 runs at a constant speed.

Assume that the rotating magnetic head 6.7 scans the tape and starts recording signals from point A in the circumferential direction in FIG. It is assumed that the rotating magnetic heads 6.7 are spaced apart by H in the rotation axis direction and are at the same position in the circumferential direction.

The rotating magnetic head 6 is now at point R1 on the magnetic tape.

7 also assumes that recording starts from the 81st point on the magnetic tape. As shown in FIG. 1, if the magnetic tape 1 is scanned in the direction of the arrow at a speed VT (m/s) and the rotating magnetic head is scanned in the direction of the arrow at a speed VH (m/s), the rotating magnetic head The tape is scanned at a speed of vH-vT.The number of rotations of the rotating cylinder is Nr, p, m, and the diameter is 8D (c).

If the wrapping angle corresponding to the recording period during one rotation is 90, then the length of the recording track is . That is, the rotating magnetic heads (hereinafter referred to as heads) 6 and 7 each have a length, and a recording track 61 of
．． and form 32. When heads 6, 7 have rotated 180° from positional forces R and S, respectively, heads 15 and 14 reach point A# and begin signal recording.

The starting points are T and U on the magnetic tape, respectively.
Rub it in the same position. The position of T is lower than the position of R by the track pitch p, and is shifted to the right by a distance L3 in the longitudinal direction. This height difference P is achieved by powering an electromechanical transducer that holds each head movably in the direction of the rotation axis. It is the traveling distance. That is, L3=VTX''' N.The positional relationship of point U with respect to Sl is also TIQ)RI
The head 13.14, which has the same relation to G, is at point T,
, U, and forms a recording track of length 0. Heads 6 and 7 have the same radial azimuth angle, and head 1
3 and 14 are the same but have different azimuth angles than head 6.7. i.e. recording trunks 61 and 33, 32 and 6
4 is recorded in what is called azimuth overwriting. When the head 6.7 reaches point B shown in FIG. 3, the recording track 31.
After completing the formation of 32 and reaching point R and point 87 on the tape, these heads are not scanning the magnetic tape 18.
During the period from point A to point f, it moves downward by twice the track pitch P and reaches point A in FIG. 6 again. Head 6.7 starts recording again from this willpower. On the tape, these points are Bird and S2, respectively. head 16
．． When the heads 14 and 14 reach point B and the recording ends, these heads are moved twice as far as the track pitch P until they are brought to the next point A, similar to Hendro and 7.

After reaching point A, recording begins again. Recording continues in the same manner.

When the head 6 finishes recording the recording track 37 and the head 7 finishes recording the recording track 8 (at this time, the head 6°7 is at point B), the head moves down twice the track pitch toward point A, so f , l, and W, and then return to the same height as when the original position, that is, the recording tracks 61 and 62, were recorded, and reach point A in FIG.

At this time, the head 6 is located at the Rn point on the magnetic tape, and the head 7 is located at the SnB point, and then the recording tracks 41 and 42'
)Form.

As can be seen from FIG. 1, if the distance between R1 and Rn is wider, the recording tracks 31 and 41. Recording track 62
and 42 do not overlap and can be recorded correctly.

Heads 6 and 7 move from & and S1 point to Rn and Sn
If n tracks are recorded until the tape returns to the point, the tape traveling distance m during this time is . The above condition is L+>Lt, that is. If the cylinder diameter is D, then the following conditions are met.

From FIG. 1, W=2(n-1)P.

-As an example, calculate with the following conditions.

If D = 40 mm, N = 180 rpm, ψ = 180 degrees P = 10 μm, and W = 1.5 + u, then VT > 25.3 mm/S, which is a value similar to the tape speed of current helical scan magnetic recording and reproducing devices.

Although the above description has been made regarding the operation during signal recording, it is clear that playback can also be performed using exactly the same operation. However, when playing back, it is the height of the recorded track.

It is necessary to accurately follow the pitch CP), which will be described later.

FIG. 4 shows the temporal changes in the heights of the heads 6.7 and 13.14. In the figure, the solid line shows the height change of the heads 6.7, and the broken line shows the height change of the heads 13 and 14. The time interval t corresponds to the half rotation time of the rotating cylinder ○ ○,
○...-...The section indicated by ○ is the recording/reproduction section. After the head 6.7 performs recording and reproduction for a period slightly longer than t at the height of the highest position 7P, it moves downward by 2P from the start of recording and reproduction until time 2. Then, after time 2, recording and playback of an interval slightly longer than t is performed again. Repeat this,
After recording and reproducing at a predetermined lowest position (position at height P in the figure), the position returns to the original highest position 1 until the start of the next recording and reproducing.

Repeat this below. Head 13.14 is at the highest position 6P
Recording and reproduction starts at the position of head 6.7 with a delay of time t. The temporal change in the height of the heads 13 and 14 is the fourth
As shown in the figure, the height is exactly the same as the 6.7 cD cylindrical height change except that the height is lower by P and delayed by time t.

As described above, in this embodiment, two or more heads are always scanning the tape, so it is suitable for a system in which a recording signal is divided into a plurality of channels and recorded. For example, in the case of a video signal, this embodiment is suitable for recording the video signal by dividing it into a luminance signal and a color difference signal.

In this case, high-definition images such as No. 100 (No. 100)
For No. When traveling in the forward direction, recording and reproduction can be performed using only the heads 6 and 15, and when traveling in the reverse direction, recording and reproduction can be performed using the heads 7 and 14. That is, in this embodiment, the area recorded by head 6.13 and the area recorded by head 7
．． Since the areas recorded in step 14 are completely divided in the tape width direction, they can be easily erased and recorded separately. That is, according to this embodiment, a VTR capable of recording and reproducing both high-definition video signals and standard video signals can be easily created.

Regarding the recording of the audio signal in the television signal, in the case of this embodiment, the winding angle ψ corresponding to the recording period shown in FIG.
It is preferable to perform so-called overlap recording of the audio PCM signal, in which the audio PCM signal is time-compressed and recorded in a period that is increased from .degree.

As for erasing the recorded signal, a full-width erasing head can be installed to erase the entire width in the width direction, or it can be divided in the cutting width direction.
It is also possible to delete it. In addition, the head 6.7 or the heads 6, 7.13.14 (a flying erase head is placed in the preceding position, respectively, and the head holding member 9
By adding I, it is possible to erase each track.

Furthermore, it is necessary to record the signal at the correct pitch interval P during recording. For this reason, a method of recording a reference signal for tracking during recording may be considered. This will be explained in detail in FIG. Figure 5 shows recording track 3 in Figure 1.
1. This is an enlarged view of the tip of 33.55. Prior to recording, the head 6 reproduces only a section of length L' and then records the signal.

After recording L and -L', a reference signal for tracking is recorded for L' intervals, and then an information signal is recorded again. As a reference signal for this tracking, for example, a signal with a constant frequency fO is recorded.

Next, the head 16 also performs the reproducing operation for the first section L' in exactly the same manner after a delay corresponding to the 180° rotation. As mentioned above,
Since the azimuth overwrite recording method is adopted, the head 16 scans partially overlapping the locus of the head 6. Furthermore, since the scanning traces of the heads 6 and 13 cross each other by just LA, during this reproduction, the head 16 reproduces a part of the reference signal for tracking recorded by the head 6 (signal with frequency fo). The azimuth of the recorded signal and the azimuth to the reproduction are different from the force to the frequency f. is a sufficiently low frequency (if this is selected, the azimuth effect is small and reproduction at a sufficient level is possible.The reproduction signal level of this frequency fO changes depending on the height of the head 16, so the level is The height of the head 16 is adjusted so that the height interval is at a level corresponding to a pinch P. After that, the head 16 records a signal, so the remaining portion of the track 51 is overwritten and erased. As shown in FIG. t, there is a recording trace of width P. That is, the head 13 has 1.
After recording the -L section signal, a reference signal fof for tracking is recorded, and then an information signal is recorded again. Even with regard to the subsequent formation of recording track 55UJ of head 6, head 1! Just like in case I, the playback level of the reference signal fo is detected, and the head flatness is controlled so that this becomes a predetermined value. In reality, it is difficult to adjust the height in one revolution, but it is controlled to a predetermined value during several revolutions.

It is also possible to control the head moving mechanism by detecting the height of the rotating head. For example, a method can be applied in which a fixed head is placed close to the rotating head in a section where the head is not scanning the tape, a signal is supplied to this fixed head, and the head height is determined from the playback level force on the rotating head. It is. In this case, if the head height is detected at two locations, the reference height of the head and the trunk pitch + can be measured, and this can be controlled by adjusting back.

Next, the operation during playback will be described. During playback, it is necessary to accurately follow the absolute height of the recording trunk and its pitch. For this purpose, the helical scan VT
A method using a pilot signal for tracking developed in R is applicable.

For example, a method of superimposing and recording a four-frequency pilot signal on an information signal can be applied.

As shown in FIG. 6, the head 6 alternately records tracking pilot signals with frequencies f1 and f, and the head 16 alternately records tracking pilot signals with frequencies f, f, frequencies fl+ft, fs, For fs, a low frequency signal with little azimuth effect is selected.

In this embodiment, the head 7.14 does not record a pilot signal. The auto tracking operation during playback is so-called 4.
This is similar to the frequency pilot method.

However, is the object of control not the tape drive mechanism but the head?
5, 7, 13, and 14 in the direction of the rotation axis. That is, in FIG. 6, head 13 is on track 3.
3, the reproduction level of the pilot signal (frequency ft) recorded on the upper adjacent track 55 is compared with the reproduction level of the pilot signal (frequency b) recorded on the lower adjacent track 55, and these levels are determined. The height of the head 13 is controlled so that the The same goes for head 6. When scanning track 35, the head 6 scans the upper adjacent track 6.
3 (playback level of frequency f) and the pilot signal recorded in the lower adjacent track 51 (
The height of the head A is controlled so that the reproduction level of the frequency f4) is equalized. Head 7 and Head 14 are Head 6
-, since the height with respect to the center head 16 is maintained at a predetermined value and this value does not change, it is only necessary to control the heights of the head 6 and the head 13. In order to scan the recording track correctly,
It is necessary to match the phase of tape running and the phase of head rotation within certain limits.

For this purpose, a signal synchronized with head rotation, for example, when recording one field of video signals on one track, corresponds to a vertical synchronization signal of the video signal. If the signal is not a video signal, or if the video signal is not one field per track, a reference signal synchronized with the head rotation f may be recorded at a predetermined position on each recording track.

52 in FIG. 6 indicates a reference signal. In this way, 1 rotation per revolution
The data is recorded at the same position on each recording track.

If recording is performed by controlling the cylinder rotation so that the tack signal of the cylinder rotation is phase-synchronized with the vertical synchronization signal, then during playback, the playback synchronization signal and the tack signal will have the same relationship as during recording. All you have to do is control the rotational phase. The difference between the helical scan VTRCv case and the present invention is that in the case of helical scan, this synchronization deviation becomes the trunk edge, but in the present invention, it does not result in a track deviation, so it can be controlled within a certain limit. The permissible range of synchronization deviation is that this permissible range can be wider than that of helical scanning. In other words, if there is enough margin for wrapping the tape in principle,
The tolerance range for out-of-synchronization is expanded. This means that the speed fluctuation range of tape running can be widened.Of course, tape speed fluctuation causes time axis fluctuation (jitter) of the playback signal.
However, the impact is small. In addition, even if a problem occurs, it can be resolved by performing time axis correction.6 Although the tracking method using four-frequency pilot signals has been explained above, it is of course possible to use other methods, such as a digital audio tape recorder (DAT) device. It is also possible to record discrete tracking pilot signals such as those used in

Although the cylinder rotation phase is controlled by the reference signal recorded on the recording track, it is also possible to apply the method used in conventional helical scan VTRs in which the control signal is recorded in the longitudinal direction (this direction) using a fixed head. All you have to do is synchronize the recording timing and cylinder tack signal, record with the control head, and maintain the same synchronization relationship between the playback control signal and tack signal during playback as during recording.Note that the tape is wound parallel to the cylinder, so It is also possible to incorporate this control head into the cylinder.

Next, the head moving mechanism used in the present invention will be explained. FIG. 7 is a sectional view of the head moving device 61, and FIG. 8 is a diagram showing the state in which it is mounted on a cylinder. FIG. 7 shows an example of a head moving mechanism using a moving coil. As shown in FIG. 8, the entire device has a substantially cylindrical shape, and FIG. 7 shows a sectional view thereof. A movable coil 70 is placed in the magnetic gap portion of the magnetic circuit including the permanent magnets 65 and 66i, and by energizing the movable coil 70, the movable coil 70 receives an electromagnetic force.

Lower yoke 62. The middle yoke 66, the upper yoke 64, the permanent magnets 65, 66, and the center yoke 71 generate a magnetic field having the direction of magnetic flux as shown by the arrows in the figure.

This magnetic field generates a radial magnetic field in the magnetic gap between the center yoke 71 and the middle yoke 65. A moving coil 70 is placed in this portion. The movable coil 70 is wound around the outer periphery of the cylindrical bobbin 69, and the bobbin 69 is movably supported in the central axis direction by two leaf springs 67.8. The outer periphery of the leaf spring 67.8 is fixed to the middle yoke 63. A part of the leaf spring 8 protrudes outward from a hole in the outer peripheral part of the device, and a head holding member 9 is attached to the tip thereof. .7 is installed.

When the movable coil 69 is energized, an electromagnetic force acts on the coil in the direction of the center axis, and the bobbin and the coil supported by the two leaf springs are displaced in the direction of the center axis. The above-mentioned protrusion of the leaf spring 8 is attached directly to the bobbin 69, and the hobbin 69.
It moves in the central axis direction together with the coil 70. Therefore, by controlling the current supplied to the moving coil 70, it is possible to control the height of the head 6.7.

FIG. 8 is a diagram showing a state in which a 61.72% cylinder head moving device is installed. The lower view in FIG. 8 is a view of the rotary cylinder 2 with the head moving device 61 +'72% @ attached as seen from below. As shown in the figure, the head moving device is attached to the rotary cylinder 2 at 180° opposing positions using two flanges provided on the lower yoke.

As a device for supplying power to these moving devices, a slip linter 80 is attached to the rotary disk 74J, forming a contact point between the rotary disk 74J and a brush 81 provided on the fixed part, and supplying current to the head moving devices from the outside. Also head 6.7,1
The recording and reproducing signals of 3.14 are supplied from the outside or taken out by the rotary transformer 77. 75 is a shirt), 75 and 76 are bearings that support this, and 79 is a stopper for applying preload to the bearing. Although the rotational drive mechanism is not shown in the figure, it is driven by, for example, a DC motor directly connected to the shaft 76.

The above 4 heads, 2 head moving devices, cylinder G
Although we have described a device that wraps the magnetic tape by a strong 180 degrees, the present invention is of course not limited thereto (many variations are possible. For example, a device with four heads and four head moving devices)・24・Describes a device that has a cylinder and wraps it around a cylinder at a strong angle of 90 degrees.

FIG. 10 is a schematic diagram of the tape running system of this embodiment, and FIG. 9 shows its tape pattern.

In this embodiment, the cylinder 102 is located at the cassette opening. This moves the cylinder horizontally into the cassette opening. This can be achieved by horizontally moving the tape cassette 15, reel stand, and motor (not shown) as one unit. Tape guide 1 as shown in Figure 5
No 8.19 movement is required and tape loading is extremely simple.

As shown in the figure, the magnetic tape 1 is wound horizontally around a cylinder by more than 90 degrees. A cylinder 1024 has four rotating magnetic heads 104, 105, 106 spaced at 90' intervals.
, 107 are arranged, and these are head moving devices 108, 109, 110, 111f, respectively.
This is installed. Further, the rotating magnetic head (hereinafter referred to as the head) 105 is at its reference position (at the highest recording/reproducing position, a height H lower than the head 104, the head 106 is also lower than the head 105 by a height H, and the head 107 is at the same <106
It is located at a lower position by H. The azimuth angle of these valley heads is 0°. Figure $9 shows the tape pattern of this example.

Each head sequentially scans the tape for a little over 90 degrees to record and reproduce signals. In other words, if the head 104 records a signal for a period of just over 90 degrees to form the recording trunk 121, then the head 105 records the signal for a little over 90 degrees and forms the recording trunk 121.
records the signal for a period of just over 90° to form a recording track 122. Head 106 then forms a recording track 126 and head 107 then forms a recording trunk 124. The head 104 moves downward by the track pitch P in a section of a little less than 270 degrees after the recording of the signal is completed. After one revolution of the cylinder, the head 104 starts recording again, forming a recording trunk 1 to 5. Then, in the same way, the head 105 records the recording track 126, and the head 106 records the recording track 12.
7, the head 107 forms a recording track 128.

This was repeated, and when the head 104 finished recording at the lowest position, the recording trunk 121 was recorded in a section of slightly less than 270°. l! : Same, record the signal back to the highest position, form the recording trunk 1 shoe. Recording tracks 132, 133, and 134% are formed in the same manner for the other heads.

The same goes for playback. As in the previous embodiment, recording and reproduction can be performed by setting the tape running speed so that the recording tracks 121 (!: 130) do not overlap.Since this embodiment does not record with rich azimuth overlap, the head level difference, Trunk pitch accuracy can be loosened somewhat.

Therefore, it is possible to eliminate head height control during recording as described in the previous embodiment. Even if the recording track pitch is slightly different, in the present invention, each head is supported by a head moving device, so during playback, appropriate auto-tracking operations, such as the well-known so-called wobbling operation, are performed. By performing automatic tracking, better playback can be achieved.

FIG. 11 shows a tape pattern of another embodiment of the present invention. In this embodiment, the tape running system and head arrangement plan view are exactly the same as in FIG.
Azimuth heads 4 and 106 have the same azimuth angle (+azimuth angle), heads 105 and 1-97 have the same azimuth angle and the opposite direction to 104 and 106, 28.

The head has an azimuth angle (-azimuth angle) of
The head 105 is located at a position lower than the head 104 by the track pitch P, the head 105 is lower than the head 104 by the distance H shown in FIG.
The difference is that P is lower at the reference position than in the reference position. The recording/reproducing operation is exactly the same as the example shown in FIG.

Stated in time order, the head 104 is located at the recording track 12.
1' is recorded by head 105, and recording trunk 122' is recorded by head 1.
06 is recording trunk 123'%, head 107 is recording track 124', head 104 is recording track 125'
4 Form.

In the previous embodiments, we have discussed the case where four heads are used, but even in the ncD embodiment, the present invention can be used with two heads, or even with one head if continuous signal recording and reproduction is not performed. It is clear from the previous explanations that the ink that holds this is unique. For example, in the case of the pattern shown in FIG. 1, if heads 6 and 13 are arranged, it is obvious that it is possible to record and reproduce a tape pattern of 1,000 times the length shown in the figure. Therefore, if you use a tape that is approximately 1/2 the width shown in the figure, it is suitable for use as a recording/playback device as is, and if the tape width is as shown in the figure, the lower width can be used for recording and playback when running in reverse. I can do it. In the case of CD, when the cylinder is running in reverse (this cylinder moves the tape in the tape width direction by about 1/2 of the tape width), recording and playback becomes possible.

The case of the embodiments shown in FIG. 9 and FIG.
Even if there are only 2 units, 04 and 105, the head relative height H
'2 It is obvious that it is possible if you choose appropriately.

In this case, there will be a period during which the signal is not recorded or played back, but even a continuous signal can be easily converted into a discontinuous signal by the time axis compression means, so it will not be a problem. Even if there is only one head, the track pitch P It is clear from the explanatory power 1 so far that there is no problem if the values are chosen appropriately and a slight guard band is formed.

Also, the angle at which the tape is wrapped around the cylinder varies widely.

For example, it is of course possible to have a wrapping angle of nearly 360°.

In the above embodiment, each head has a constant -ip for each rotation,
Although the tape is moved in a section where it is not being scanned, it is also possible to perform this movement continuously (at a rate of 1 rotation per rotation).

Figure 12 shows the tape pattern when this method is adopted in the first embodiment (Figure 16 shows the change in the head length over time).
As shown in the figure. The difference between FIG. 12 and FIG. 1 is that the recording trunk 6
1' is slightly inclined with respect to the tape running direction. This inclination is 2 times the trackvituna in one rotation of the cylinder.
Since the angle of inclination θ is doubled, FIG. 13 shows changes over time in the movement of each head.

The difference from FIG. 4 is that in FIG. 4, the movement of each head is stepwise, whereas in FIG. 16, the movement changes linearly. However, the average rate of descent is exactly the same, 2 track pitches per cylinder revolution. As shown in Fig. 13, when returning from the lowest position to the reference position t (the height of 8P in Fig. 9, the highest position where recording and playback starts), the user must first reach a position higher than the reference position, and then If the head moves down at a rate of 2 trunk pitches per rotation and reaches the reference position (right at the start of recording/playback), the head will move smoothly and accurate tracing will be possible.In the example above, D=40mm, P=1101
t, the angle θ is approximately 0.5' in this example, which is an extremely small angle. FIG. 12 is a schematic diagram.

The recording tracks with numbers marked with ' in FIG. 12 correspond to the approximate tracks in FIG. The only difference between FIG. 1 and FIG. 12 is the angle of inclination, and the rest are exactly the same.

Ru. The present invention differs from the helical scan method in that the recording trunk is parallel or substantially parallel to the tape running direction, so the track trace is independent of the tape running speed. That is, there is no need to change the angle at which the tape is scanned in accordance with the tape running speed, which is carried out in variable speed playback of a helical scan VTR. For example, still image reproduction can be easily achieved by maintaining the head at a predetermined height.

Figure 14 (This shows the movement status of each head in the case of a 5x speed search.In the case of a 6x speed search, two heads are needed to trace every third recording track, so each head has over 1800 After the tape is scanned and played back, the tape is not scanned during the period when the tape is moved downward by 6 track bits and the tape is scanned and played back again. FIG. 14 shows the embodiment described in FIG. 1. This is the case when the number of tracks is large.The same is true for the case of Fig. 1, but in these Figs. , in the above calculation example this number amounts to 150 tracks.

In the example shown in FIG. 14, the head 6.7 moves down six track pitches after the reproduction is completed, repeats this twice, and returns eight track pitches. After playback, the next track pitch goes down, and after playback, it goes back 8 track pitches.For heads 13 and 14, there is a height difference and a time lag, but the operation is the same.In this case, what is important is that each head alternates every 6 tracks. In other words, since the tape is running at three times the speed, it is possible to trace at a position six tracks down with the same timing as when it was recorded.Variable speed playback In this case, the relative speeds of the tape and head necessarily differ from standard playback, so in the preferred embodiment,
It is desirable to change the cylinder rotation speed depending on the speed. Otherwise, in a very fast search, the tape wrapped around the cylinder must have enough corners to completely reproduce the signal.

FIG. 15 shows a case of 1/2 throw, in which field memo IJ'2 is used. This figure shows the temporal change in head movement and the memory reading timing. As an example, explanation will be given by taking 1/2 slow as an example in the case of the example whose track pattern is shown in FIG. The tape runs at 1/2 the standard speed.

First, the heads 6 and 7 are respectively connected to the recording trunk 31 in FIG.
．． 32i playback. The reproduced signal is stored in the field memory 1 and read out twice between two consecutive fields, that is, from time t to 3t, to become a reproduced signal. Heads 13 and 14 each record trunk 33 from time 2t.
．． 34) f: This signal is also played back in another field memory 2.
is memorized. The contents of this memory are stored in the following two fields, ie between times 6t and 5t. It is read out 12 times and becomes a reproduced signal.

The head 6.7 moves down by 2P between time t and 2t, and records recording tracks 35 and 56 from time 4t to 5t, respectively.
The result is stored in the field memory 1, and is read out twice between 5t and 7t to become a reproduced signal. This operation is repeated and a 1/2 slot reproduction signal is output. Since the signal is reproduced frame by frame at 1/2 slow speed, each head traces the recording track at the same correct timing as when recording. 1/
It is clear from the above description that 3 throws and 1/4 throws can be performed in exactly the same way. That is, there is no need to perform complicated head displacements as seen in the zero-helix scan method, which is possible by changing the reproduction timing by the head and changing the number of times the memory contents are read.

Further, there is no need to perform intermittent tape drive such as so-called fine throw.

〔Effect of the invention〕

According to the present invention, the magnetic tape is wound horizontally around the rotating cylinder, the tape running system and the tee loading mechanism are extremely simple, the tape can be run with high precision, and it is inexpensive, small, and has high performance. It is possible to produce a magnetic recording/reproducing device.

In addition, since the tape running direction and the head scanning direction match, fluctuations in tape running speed are unrelated to track bending and trunk tracing, making extremely high-precision tracking possible, making it possible for high-density magnetic recording and reproducing devices to It is possible. Further, as described in the embodiment, variable speed reproduction can be easily performed.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a tape pattern of an embodiment of the present invention;
Figure 2 is a diagram showing the 0) cylinder section, Figure 3 is a diagram showing an overview of the tape running system, Figure 4 is a diagram showing changes in head movement over time, and Figure 5 is a diagram showing the recording track. An enlarged view of the tip, FIG. 6 is a diagram showing the recording pattern of the tracking pilot signal, FIG. 7 is a sectional view of the head moving device used in the present invention, and FIG. 8 is the head moving device mounted on a cylinder. Figure 9 shows the state in which
The figure shows a tape pattern of an embodiment of QJ Tsukuda of the present invention.
FIG. 10 is a diagram showing an outline of the tape running system, and FIG. 11 is a diagram showing a tape pattern of still another embodiment of the present invention.
FIG. 12 is a diagram showing a tape pattern of still another embodiment of the present invention, FIG. 13 is a diagram showing changes in head movement over time, and FIG. 14 is a diagram showing variable speed playback (3x speed search) of the apparatus of the present invention. FIG. 15 is a diagram showing the time change of the head movement for the same <1/2 slot and the reading and reading timing of the memory used. ...Magnetic tape 2,102...Rotating cylinder 3...Fixed cylinder 4...Lead part 9...
Head holding member・56 6, 7, 13.14.104.105.10<S, 1
07...Rotating magnetic head 51-44.121-133, 121'-133',
31' to 68'... Recording track 61.72... Head moving device 8.67... Leaf spring 70... Coil 65.6
6...Permanent magnet

Claims (1)

[Claims] 1. The magnetic tape (1) is run at a constant speed, and the magnetic signal converting means (6, 7, 13, 14, 104, 105, 10
6, 107) on the magnetic tape (1) at a constant speed, and the magnetic signal converting means (6, 7, 1
3, 14, 104, 105, 106, 107) in the tape width direction to record and reproduce signals. 2. The magnetic signal conversion means (6, 7, 13, 14, 10
4, 105, 106, 107) are rotating magnetic heads (6
, 7, 13, 14, 104, 105, 106, 107)
The magnetic tape (1) is rotated by a rotating magnetic head device (2, 3, 10
2. The magnetic recording/reproducing device according to claim 1, wherein the magnetic recording/reproducing device has a structure in which the magnetic recording/reproducing device is wound horizontally without changing the height in the center direction of the rotating shaft. 3. Rotating magnetic head (6, 7, 13, 14, 104, 1
05, 106, 107) are rotating magnetic head devices (2,
3. The magnetic recording and reproducing apparatus according to claim 2, wherein the magnetic recording and reproducing apparatus is attached to a head moving device (61, 72) fixed to a rotating cylinder of the magnetic head (61, 72). 4. One head moving device (61, 72) has a plurality of rotating magnetic heads (6, 7, 1) having steps in the direction of the rotation axis.
4. The magnetic recording/reproducing device according to claim 3, wherein the magnetic recording/reproducing device is provided with a magnetic recording device (3, 14). 5. The magnetic signal conversion means (6, 7, 13, 14, 10
4, 105, 106, 107) is composed of a plurality of magnetic recording and reproducing apparatuses, and is configured to record signals dividedly in the tape width direction. 6. During recording, the above rotating magnetic head device (2, 3, 10
Record a reference signal (52) synchronized with the rotational phase of 2),
3. The magnetic recording and reproducing apparatus according to claim 2, wherein the rotational phase of the rotary magnetic head device (2, 3, 102) or tape running is controlled by the reference signal reproduced during reproduction. 7. When recording, the tracking pilot signal (f_0
) and this pilot signal (f_0
) and uses this reproduced signal to convert the magnetic signal during recording (6,
2. The magnetic recording and reproducing apparatus according to claim 1, wherein the magnetic recording and reproducing apparatus is configured to control the positions of the tapes (7, 13, 14, 104, 105, 106, 107) in the tape width direction. 8. The magnetic signal conversion means (6, 7, 13, 14, 10
4, 105, 106, 107 are not scanning the magnetic tape (1), the magnetic signal converting means (6, 7, 13, 14, 104,
105, 106, 107) in the tape width direction;
2. The magnetic recording and reproducing apparatus according to claim 1, wherein the magnetic recording and reproducing apparatus is configured to control the heights of the tapes (105, 106, 107) in the tape width direction. 9. The magnetic recording and reproducing apparatus according to claim 5, wherein the signal recording position is separated vertically in the tape width direction when the magnetic tape is running in normal rotation and when it is running in reverse.