JPH02206013A - Magnetic recording and reproducing device and reproducing combination head - Google Patents

Abstract

PURPOSE:To eliminate interference between a recording signal and a reproduced signal by successively scanning tracks with first reproducing heads, recording heads, and second reproducing heads and arranging respective heads in such positions that recording heads do not simultaneously scan any track string. CONSTITUTION:The relational position of a reference point provided on each head is determined to satisfy formulas where n1, phi1, n2, phi2, Tp, V, N(rpm), theta0, theta1, h1, h2, and D(mm) are the number of tracks between a first reproducing head 11a (11b) and a recording head 12a (12b), the offset, the number of tracks between the reproducing head 11a (11b) and a second reproducing head 13a (13b), the offset, the track pitch, the tape speed, the rotational frequency of a drum 9, the angle of inclination, the track angle on the magnetic tape, the difference in height between heads 11a and 12a, and that between heads 11a and 13a, and the diameter of the drum 9 respectively, the steps 11a, 12a and 13a are chosen to satisfy h2>=h1 and the tape is wound around the drum at an angle larger than the offset angle formed by heads 11a and 12a. Thus, interference between recording and reproduced signals is eliminated, and a device capable of after-monitor and editing recording is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording and reproducing apparatus such as a rotary head type digital audio tape recorder (RDAT) that performs recording and reproducing simultaneously.

2. Description of the Related Art In recent years, rotary head type digital audio tape recorders (hereinafter abbreviated as R-DAT) have been commercialized.

The basic configuration of this R-DAT will be described below. 8th
This figure is a layout diagram of a rotating drum, magnetic head, and tape of a conventional R-DAT, and FIG. 9 is a schematic pattern diagram showing a track pattern on a magnetic tape. In FIG. 8, 1 is a rotating drum having a diameter of 30 mm, which rotates counterclockwise. 2a and 2b are a pair of magnetic heads with different azimuths, and 18 magnetic heads are arranged in the same plane of the rotating drum 1.
They are installed facing each other at 0 degrees. 3 is a magnetic tape that runs 90 degrees around the rotating drum 1; 4a, 4;
b is a travel guide column that determines the travel path of the magnetic tape 3;

In FIG. 9, 5a, Ba, 7a, 8a are magnetic heads 2a, and 5b, Gb, 7b, 8b are magnetic heads 2b.
2A and 2B respectively show track rows that are sequentially scanned on the magnetic tape 3.

The basic operation of the magnetic recording and reproducing apparatus configured as described above will be explained below. During recording, recording signals are sequentially recorded on the magnetic tape 3 via the magnetic heads 2a and 2b, and the tiger/vine rows 5a to 8a, which have mutually different azimuths.
5b to 8b are formed, respectively. Also, during reproduction, the track rows 5a to 8a on the magnetic tape 3.

Signals 5b to 8b are sequentially reproduced by magnetic heads 2a and 2b corresponding to the respective azimuths. At this time, since the track arrays 5a to 8a and 5b to 8b have different azimuths, signal components of adjacent tracks will not be mixed into the reproduced signal.

In this way, the magnetic heads 2a and 2b are used selectively as a recording head or a reproducing head, and the magnetic recording/reproducing apparatus is used selectively for recording or reproducing depending on the purpose and use.

Problems to be Solved by the Invention However, in the magnetic recording and reproducing apparatus as described above, the magnetic heads 2a and 2b function only as a recording-only head or a reproduction-only head depending on the purpose and use.
It is possible to realize after-monitoring, which monitors the recording status by simultaneously recording and playing back, or editing recording, which performs insert recording and splicing while adjusting the timing of the playback signal and recording signal between the preceding playback head and the following recording head. There wasn't. Furthermore, even if a dedicated magnetic head for recording and playback is simply added to the rotating drum, there is a problem in that the recording signal mixes into the playback head system on the rotating drum as a crosstalk component, causing the playback system to not operate properly. There was a point.

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a magnetic recording/reproducing device capable of after-monitoring and editing/recording.

Means for Solving the Problems To achieve this object, the magnetic recording and reproducing apparatus of the present invention includes a first reproducing head mounted on a rotating drum with respect to a track row formed diagonally on a magnetic tape. ,
The recording head and the second reproducing head sequentially scan, and the recording head scans the first . The respective heads are arranged in a positional relationship such that they do not simultaneously scan the track row with any of the second reproduction heads, and the magnetic tape is arranged so that at least the first reproduction head
The reproducing head and the recording head are configured to wrap around each other at an angle larger than the offset angle formed by the recording head.

Effect of the present invention With the above-described configuration, the first reproducing head, the recording head, and the second reproducing head sequentially scan, and
The recording head is the first recording head. Since neither of the second reproducing heads scans the track row at the same time, the recording signal does not overlap and interfere with the reproducing signal in time, and the recording head and the first. It becomes possible to use the second playback head simultaneously.

EMBODIMENT A magnetic recording/reproducing apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view showing the configuration of a magnetic recording/reproducing apparatus according to a first embodiment of the present invention, FIG. 2 is a perspective view related to FIG. 1, and FIG. 4 is a schematic diagram showing the positional relationship between the reproducing head and the recording head of
The figure is a schematic diagram showing the positional relationship between the first reproducing head and the second reproducing head as seen from the magnetic surface of the magnetic tape.

In Figure 1, 3 is the magnetic tape, 9 is 20 in the counterclockwise direction.
The rotating drums 1 oa and 10 b having a diameter of 30 III 1 m and rotating at 0 rpm are running column guides that determine the running path of the magnetic tape 3 so that it runs while being wound around the rotating drum 9 at an angle of ψ. Ila
, llb are a pair of first playback heads with different azimuths, and are arranged 180 degrees on the first plane in the rotating drum 9.
are installed facing each other. Reference numerals 12a and 12b denote a pair of recording heads having different azimuths, which are mounted 180 degrees opposite each other on a third plane within the rotating drum 9 and at an offset angle of φ1 from the first reproducing heads lla and llb. There is. Further, 13a and 13b are a pair of second reproducing heads having different azimuths, and are opposed to each other by 180 degrees on the second plane in the rotating drum 9, and are at an offset angle of φ2 from the first reproducing heads Ila and Ilb. It is attached with. In addition, the heads lla, 12a, 13a
have the same azimuth, and the heads Ilb, 12b, 1
3b have the same azimuth. Further, as shown in FIG. 2, the first plane and the second plane have a step hl, and the first plane and the third plane have a step h2. In addition, the winding angle ψ is greater than the offset angle φ1.

Here, the mutual positional relationship between the first reproducing heads lla and Ilb and the recording heads 12a and I2b will be explained in detail. When the state shown in FIG. 1 is the initial state, and the time required for the rotating drum 9 to rotate and the head lla to reach the position in the initial state of the head 12a is t(φI), where φ1: first reproduction A relational expression is established between the offset angle [degl N] created by the head and the recording head: the rotation speed [rpm] of the rotating drum.

In FIG. 3, A and B indicate the positions of the reference points of the heads Ila and 12a in the initial state, C indicates the position of the reference point of the head 11a after t(φ1), and D and E are points on the magnetic tape that have moved from points A and B during t(φ1). Here, if the distance between A and D and between B and E is d, then the following relational expression for tape speed holds true.

14 and 15 are points A, D and B, respectively;
This is an imaginary straight line passing through E and along the running direction of the magnetic tape. If straight lines 14 and 15 are respectively the scan start line and scan end line of the track row, then 16 is the head Ila.
Therefore, it is clear that 17 is the track scanned by the head 12a. Note that F is the scanning end point of the track 16, and G is the scanning starting point of the track 17.

By the way, if the distance from point B to straight line DC is e,
The distance between points B and C is the difference h between the heights of heads lla and 12a.
Since it is equal to 1, e=hI@part(θ, -08)...(3
) However, the following relational expression holds true: θ1: track angle on the magnetic tape θfl: inclination angle hI of the rotating drum: difference in height between the first magnetic head and the second magnetic head. Furthermore, if the distance from point B to track 17 is f, then from equation (2), f=d11sl
ne.

The relational expression holds true.

Here, since the distance between the track 16 and the track 17 is an integral multiple of the track pitch, nl·Tp= f 10e φ+ G from equations (3) and (4).

=V・□・□Kenshi 0 6ON 10,・■(θ1-00) ...(5) However, nl: Track interval (books) between the first playback head and recording head Tp:) Rack pitch The relational expression holds true. In other words, equation (5) is head lla
is a conditional expression for the head 12a to scan the track scanned again, and the heads 11a+12a are arranged so as to satisfy the expression (5).

On the other hand, the intersection of the rotation locus AC of the head Ila and the straight line 15 is H
Then, when the head Ila moves from point A to point H, the rotating drum 9 with a diameter of 30 mm rotates 90 degrees. Point H
If the distance between and C is g, then the offset angle φ1 created by the heads Ila and 12a is: φKoni90+3 60 ・π ・D =90+380・・・・(6) π fist D
・tanθ9 I However, D=rotating drum diameter [30mm]. In other words, by satisfying the formula, head ll
a and 12a do not scan the track row at the same time.

The explanation so far has been about the positional relationship between the heads lla and 12a, but the relationship between the heads llb and 12b is also the same, so the explanation will be omitted.

Next, the mutual positional relationship of the first reproducing heads Ila, Ilb and the second reproducing heads 13a, 13b will be explained in detail. When the time required for the rotating drum 9 to rotate from the initial state shown in FIG. 1 and for the head lla to reach the position of the head 13a in the initial state is t(φ2),
In FIG. 4, ■ and J indicate the positions of the reference points of the heads Ila and 13a in the initial state, respectively, and K and L indicate the positions of the heads Ila and 13a after t (φ2).
This is a point indicating the position of the reference point 13a. 14 and 15 are the scan start line and scan end line of the track row, respectively, as in the case of FIG. 3, and M and P on the scan end line 15 are the scan end points of the heads lla and 13a. Tracks 16 and 18 are scanned by heads lla and 13a, respectively, and track 18 is assumed to be on the left side of track 17 in FIG. 3, that is, on the downstream side of the tape.

Here, since the distance between the track 16 and the track 18 is an integral multiple of the track pitch, the relational expression that satisfies this condition is +h, a c, similar to the idea that derived equation (5).
os (θ1 - θa) - (7) where, n2: Track interval (lines) between the first and second playback heads φ2: Offset angle created by the first and second playback heads [ deg] h2: Represented by the difference in height between the first reproducing head and the second reproducing head, and the heads lla and 13a are arranged so as to satisfy equation (7).

On the other hand, if the distance between point ■ and K is i, heads lla and 13
The offset angle φ2 created by a is as follows. That is, by satisfying equation (8), heads lla and 13a simultaneously scan the track row, and therefore heads lla and 13a scan the track rows at the same time.
means that the track rows are not scanned simultaneously. The explanation so far has been about the positional relationship between the heads Ila and 13a,
The relationship between heads llb and 13b is also the same, so a description thereof will be omitted.

The operation of the magnetic recording/reproducing apparatus configured as described above will be described below with reference to FIGS. 3, 4, and 5.

FIG. 5 is a time chart for explaining the operation shown over time. In FIG. 5, t represents the time axis, jil + jl + j2 + t3 + j4 represents the timing each time the rotating drum 9 rotates 90 degrees,
In particular, tfI indicates the timing when the head lla is located at point A in FIG. j, k.

1+q+r+8 are heads Ila, llb, and 12, respectively.
a, 12b.

13a and 13b, and indicates that each head is scanning the track in the H level section of each waveform.

At time tll, as shown in waveform l, the head 12a
is located at point B on the scan end line 15 in FIG. 3 and finishes scanning track 17, and head lla is located at point A on scan start line 14 and finishes scanning track 16, as shown in waveform j. We're about to start. At this time, as shown by waveform r, the head 13a is also located at point J on the scanning start line 14 in FIG. 4 and is about to start scanning the track 18.

The rotating drum 9 rotates 90 degrees from time tll to time t.

Then, the heads lla and 13a reach points H and P on the scanning end line 15, respectively, and finish scanning the tracks IEI and 18, and are attached to the head 12a facing 180 degrees as shown in the waveform q. The head 12b appears on the scanning start line 14 and starts scanning the track to the right of the track 17.

Further, when the rotating drum 9 rotates 90 degrees from time t1 and reaches time t2, the head 12b reaches the scan end line 15 and ends the scan, and the heads llb and 13b move to the scan start line 15 as shown in the waveform and S. It appears above and starts scanning the tracks to the right of tracks 16 and 18, respectively.

Here, heads Ilb, 12b, 13b at time t2
The relative positional relationship of head ll at time tll is
a, 12a.

It is clear that the relative positional relationship between the two heads 13a and 13a is exactly the same, so at time t3, the heads Ilb and 13b finish scanning, as at time t1, and as shown in waveform 1, head 12a is scanned by head 12b. Start scanning the track to the right of the track. Further, at time t4, the rotating drum 9 rotates once and returns to the state at time tll, and the head lla
, 13a scan the tracks to the right of the track scanned by heads llb and 13b, respectively.

Similarly, each head is 12a, then lla and 1.
The track row is alternately scanned in the order of 3a1, then 12b, then Ilb and 13b. Further, the intervals between the track where head lla starts scanning, the track where head 12a ends scanning, and the track where head 13a starts scanning are n and n2 (lines), respectively. Similarly, the track where the head 11b starts scanning and the track where the head 11b starts scanning
The distances between the track where head 2b finishes scanning and the track where head 13b starts scanning are nl and n2 (lines), respectively.

Note that the magnetic tape 3 is wound around the rotating drum 9 at an angle ψ greater than or equal to the offset angle φ7.
1a, 1lb and recording heads 12a, 12
The time j when b touches the track edge when they are the most distant from each other
In all states including ll+t2, one of the heads is in contact with the magnetic tape 3 and scanning the track.

Therefore, for example, the recording heads 12a and 12b are respectively at times t2 to t4. The second playback head I2a, 12b performs after-monitoring of the track string recorded from tl to t2 at time IJtlI"t++ h to t3, or the first playback head lla,
llb at time t9~jl+ j+! ~t3
While measuring the timing of the reproduced signal and the line-in signal, data processing is performed and the recording head 12a,
12b is re-recorded from time t3 to tA and from jl to t2, so-called edit recording is possible. In this case, the track interval n1 may be secured by the time required for signal processing.

Here, various values were substituted into equations (5) to (8) in the example of bookcase 1 to obtain the following values.

φ+'=9 3. 4 8 [d
eg φ2″1.71 [d
egkoh,',0. 10167 [mm]h2'
=0. 10873 [:mm] ψ ≧93°48
[degl However, n+=n2=8, rpm0. 013591
ffm.

θ1=6°22' 59.5" θθ=6°22' v=8. 150mm/sec.

According to the embodiment of the bookcase 1, the first reproducing head 11a is placed on the first plane within the rotating drum 9, such that N=200 Orpm + D==30 mm or more.

11b facing each other 180 degrees, and there are steps h+', 0.10187 mm and ha'- from the first plane.
On the second and third planes below 0,10873 mm,
Offset angle φ+ with respect to the first playback head: 9
Recording head 1 at 3.48° and φ2″i3.71′
2a, 12b and a second playback head 12a,
I 3 b are mounted facing each other at 180 degrees, and the running guide column 10a is arranged so that the winding angle of the magnetic tape 3 around the rotating drum 9 is ψ≧93.48 degrees.
, 10b, the first
The reproducing head, the recording head, and the second reproducing head sequentially scan, and the recording head scans the first reproducing head, the recording head, and the second reproducing head sequentially. Since neither of the second reproducing heads scans the track array at the same time, the recording signal does not overlap and interfere with the reproducing signal in time, so the recording head and the first. After-monitoring or editing recording is possible by using the second playback head at the same time.

Next, a second embodiment of the present invention will be described below with reference to the drawings.

FIG. 6 is a front view of a reproducing combination head according to a second embodiment of the present invention, and FIG. 7 is a plan view of the reproducing combination head.

In FIGS. 6 and 7, 19a is a reproduction combination head. 20a and 21a have a step h2'', 0.l087 inside the reproduction combination head 19a.
These are read head elements arranged at an offset angle φa' of 3.71°, and are the first read head lla and the second read head 13 in FIG. 1, respectively.
Corresponds to a. 9 is a rotating drum, 22a is a positioning hole, and the reproducing combination head 19a is fixed to the rotating drum 9 through the positioning hole 22a. Further, 23 is the center point of the rotating drum 9. Although omitted in the drawing,
A combination head containing reproducing head elements corresponding to heads llb and 13b is mounted 180 degrees opposite the reproducing combination head 19a.

The operation of the embodiment of the bookcase 2 having the above configuration is exactly the same as that of the first and second reproducing heads in the first embodiment, so the explanation will be omitted.

As described above, according to the embodiment of the bookcase 2, by integrating the first and second reproducing heads that are close to each other, it is possible to position two types of heads at the same time, making it easier to attach the heads. There is an advantage.

Effects of the Invention As described above, the magnetic recording/reproducing apparatus of the present invention has a first reproducing head, a recording head,
While the second reproducing head sequentially scans, the recording head scans the first. By arranging the respective heads in a positional relationship such that they do not simultaneously scan the track row with any of the second playback heads, the recording signal does not overlap and interfere with the playback signal in time, and the recording Head and 1st. It becomes possible to use the second playback head simultaneously. Further, the magnetic tape is wound around the rotating drum at an angle greater than at least an offset angle formed by the first reproducing head and the recording head, so that each of the heads completely scans the corresponding track row. Therefore, there is no risk of data being lost during recording or playback. Therefore, after-monitoring, which monitors the recording status by simultaneously recording and playing back, or editing recording, which performs insert recording and splicing while adjusting the timing of the playback signal and recording signal between the preceding playback head and the following recording head. In addition, by using dedicated heads for the recording head and playback head, it is possible to optimally set the head shape, magnetic characteristics, mounting position, etc., improving performance, accuracy, reliability, etc. during recording and playback. do.

In addition, the first . By using a reproduction combination head that integrates the second reproduction head, in addition to the above-mentioned effects, positioning and attachment of the two types of heads becomes easier. Furthermore, by making the diameter of the rotating drum the same as that of the conventional one, there are advantages such as the ability to share the motor and control circuit that drive the rotating drum.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the configuration of a magnetic recording/reproducing apparatus according to a first embodiment of the present invention, FIG. 2 is a perspective view related to FIG. 1, and FIGS. 3 and 4 show the positional relationship of each head. FIG. 5 is a time chart for explaining the operation shown over time; FIGS. 6 and 7 are schematic diagrams of the reproducing combination head according to the second embodiment of the present invention; FIG. 8 is a conventional reproducing combination head. FIG. 9 is a schematic pattern diagram showing the track pattern on the magnetic tape. 9...Rotating drum, IOa, lOb...Traveling guide column, 11a, Ilb...First reproducing head, 1
2a, 12b... recording spatula p, 13a, 13b second playback head, 19a... playback combination head. Name of agent: Patent attorney Shigetaka Awano, 1 person + r'I
-、1″L'LヱIr'l 'T n p 1t! ρ

Claims (5)

[Claims] (1) A first reproducing head, a recording head, and a second reproducing head mounted on a rotating drum sequentially scan a track array formed diagonally on a magnetic tape, and the recording head A magnetic recording and reproducing apparatus, characterized in that each of the heads is arranged in a positional relationship such that neither the first nor the second reproducing head scans the track row at the same time. (2) Each reference point provided on each head is determined by the following relational expression n_1・Tp=v・φ_1/360・60/N・sin
θ_1+h_1・cos(θ_1−θ_0) n_2・Tp=v・φ_2/360・60/N・sin
θ_1+h_2・cos(θ_1−θ_0) φ_1=90+360・h_1/(π・D・tanθ_
0)φ_2=360・h_2/(π・D・tanθ_0
)h_2≧h_1 Where, n_1: Track interval between the first playback head and the recording head (lines) n_2: Track interval between the first playback head and the second playback head (lines) Tp: Track pitch v: Tape Speed φ_1: Offset angle created by the first playback head and recording head [deg] φ_2: Offset angle created by the first playback head and second playback head [deg] N: Rotation speed of rotating drum [rpm] θ_1: Track angle θ_0 on the magnetic tape: Inclination angle of the rotating drum h_1: Difference in height between the first reproducing head and recording head h_2: Difference in height between the first reproducing head and the second reproducing head D: Rotating drum 2. The magnetic recording and reproducing apparatus according to claim 1, wherein the magnetic recording and reproducing apparatus is arranged in a positional relationship that satisfies a diameter of 30 mm. (3) The magnetic recording and reproducing device according to claim 1, wherein the magnetic tape is wound around the rotating drum at an angle larger than an offset angle formed by at least the first reproducing head and the recording head. Device. (4) A reproduction combination head that includes two reproduction heads, and the positional relationship between each contained reproduction head is equal to the positional relationship between the first and second reproduction heads. . (5) The magnetic recording and reproducing apparatus according to claim 1, further comprising the reproducing combination head instead of the first and second reproducing heads.