JPS58220202A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To simplify the constitution of a magnetic recording/reproducing device and at the same time to shorten the dubbing time, by providing a pair of magnetic heads of different azimuths with free reciprocal motions toward the shaft of a rotary drum and driving a magnetic tape in parallel to the circumference surface of the drum. CONSTITUTION:Two windows 2 are provided at two areas of the surface 1A of a rotary drum 1 in parallel to and symmetrically to the rotary shaft. At the same time, magnetic heads 3 and 4 are set which can have free reciprocal motions along the windows 2 and in parallel to the shaft (rectangular to the drawing). Thus the heads 3 and 4 have reciprocal motions in the axial direction by means of drivers 5 and 6. These drivers are moved by a driver control means 7 in a prescribed direction and by a prescribed distance with each turn of the drum 1. A magnetic tape 100 is fed from a reel 12 and driven with a rub to the surface of the drum 1 so that the width direction of the tape 100 is set in parallel to the rotary shaft of the drum 1. Then the tape 100 is taken up to a reel 13. In such a way, the parallel tracks are formed along with installation of heads of the same number as the tracks, and the dubbing time is reduced with a simple structure.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a reproducing device, and particularly to a magnetic recording and reproducing device capable of forming recording tracks in the width direction of a magnetic tape by a pair of magnetic heads reciprocatably attached to a rotating drum. .

Conventionally, magnetic recording and reproducing devices that record and reproduce video signals using a rotating magnetic head device have been known to operate a rotating magnetic head in a direction that is inclined at a predetermined angle with respect to the running direction of a magnetic tape serving as a magnetic recording medium. Recording of video signals through each inclined video track formed in an array on the magnetic tape by scanning! A so-called helical scan type video tape recorder that performs playback is known.

The helical scan type video tape recorder is capable of increasing the relative speed of the magnetic head and the magnetic chip, thereby making it possible to record video signals at high density by slowing down the running speed of the magnetic tape.

By the way, the helical scan type bidet book mentioned above.

In order to run the tape in sliding contact with the circumferential surface of the rotating drum,
Place the tape against the circumferential surface of the drum.

Since the tape must be constructed to be able to run at a certain angle of inclination, it is difficult to ensure precision in the mechanical attachment of the tape running system, especially the rotating drum.

In addition, in so-called dubbing, which is an operation of recording a video signal recorded on a magnetic tape by the video me player onto another magnetic tape, the magnetic head is moved to a predetermined position on the magnetic tape. Since the recording trunk of the video signal recorded at an inclined angle must be scanned, the dubbing time becomes long.

The present invention has been proposed in view of the above circumstances, and is capable of high-density recording of video signals in the same way as the conventional helical scan type video tape recorder, and is capable of recording video signals in a high-density manner, for example, in the same way as conventional helical scan type video tape recorders. The installation is easy to ensure accuracy and! The object of the present invention is to provide a novel magnetic recording/reproducing device that can shorten the grading time.

Another object of the present invention is to reliably prevent crosstalk between valley recording tracks.

Hereinafter, preferred embodiments of the present invention will be specifically described based on the drawings.

FIG. 1 is a schematic plan view of a magnetic recording and reproducing device according to the present invention;
FIG. 2 is a partially cutaway external perspective view showing a state in which the magnetic tape is wound around a rotating drum. This magnetic recording and reproducing device has a magnetic recording and reproducing device. A pair of magnetic heads 3 and 4 are attached to the rotating drum 1 so as to face outward through a long hole 2°2 formed in the circumferential surface 1A of the drum 1.
have. The elongated holes 2, 2 are opened in one direction of the drum 1 at opposing portions on the diameter line of the drum 1, and the pair of magnetic heads 3, 4 are connected to the drum 1.
It is possible to freely reciprocate in the axial direction of the drum 1 at opposing positions on the diameter line. To each of the above = 3- The magnetic head drivers 5 and 6 made of bimorph plates are fixed to the tips of the magnetic head drivers 5 and 6 disposed inside the drum 1, and the valley drivers 5 and 6 control the driver drive. The reciprocating motion is controlled by drive control by the means 7.

The driver drive control means 7 controls the drive of each of the drivers 5 and 6 according to the rotational speed of the drum 1, and drives the valley heads 3 and 4 so that they always move at a predetermined distance apart in the vertical direction. Control.

Further, the magnetic tape 100 pulled out from the cassette 8 by a tape drawer winding mechanism (not shown) is wound parallel to the circumferential surface 1A of the drum 1 via the guide pin 9,
The capstan 10 and the pinch roller 11 slide in parallel to the circumferential surface 1A of the drum 1. In addition,
In FIG. 1, 12 is a supply reel, 13 is a take-up reel, 14 is an audio magnetic head (audio head), and 15 is a reference signal magnetic head (CT
(L head).

4- Also, the azimuth angles (inclination angles of the head gaps) of the valley heads 3 and 4 are different from each other, and as shown in FIG. 3, the recording track TR formed by the first magnetic head 3 is
The inclination angle of the recording azimuth of the recording track Tn formed by the second magnetic head 4 is +01, and the inclination angle of the recording azimuth of the recording track Tn formed by the second magnetic head 4 is set to be +01.

Next, the recording pattern of the recording tracks formed on the magnetic tape 100 by the heads 3 and 4 will be described.

FIG. 4 is a diagram showing an example of the recording pattern. The driver drive control means 7 determines in advance the height positions of the first and second magnetic heads 3.4 on the drum circumferential surface 1A so that the first magnetic head 3 is at a distance from the second magnetic head 4. It is set to be 11 minutes higher.

First, the magnetic tape 10 is inserted into the magnetic tape 10 by the first magnetic head 3.
0, the first recording track TR is located below.

is formed parallel to the running direction of the tape 100 (arrow direction in the figure). Next, the second magnetic head 4 is moved a distance of 1.0 mm from the first recording track Tnl. A second recording track TR2 is formed at a lower portion. Note that each of the above tracks TR,.

Starting end of T112 TRI' +TR, yes 2 each head 3,
4, the arrangement position on the circumferential surface IA of the drum 1 is 180.
Judging from the fact that they are shifted by 12 degrees, they are only 12 minutes apart in the direction of travel.

When the driver drive control means 7 receives a detection signal of one revolution of the drum 1, the control means 7 causes each of the drivers 5 and 6 to move each head 3° 4 in one direction in the axial direction of the drum 1. side, that is, one direction of the tape width (the fourth
A signal is supplied to simultaneously move the robot a distance of 13 times (in the upper direction in the figure). Then, as the valley heads 3 and 4 move in response to the signal, the first magnetic head 3 is moved to a height position a distance 13 upward from the first recording track TR1. A recording trunk TR3 of 3 is formed. Further, the second magnetic head 4 is also located at a distance of 1 from the second recording trunk TR2 in the same way as the first magnetic head 3.
3. A fourth recording track T is placed at a height away from the top.
Form R4.

In this way, by moving each of the heads 3 and 4 in one direction of the tape width by the driver drive control means 7, a plurality of sets of records are recorded in one direction of the tape width of the magnetic tape 100. Track set, in this example first and second recording tracks TR,','
TR2, third and fourth recording tracks TR3, TR4,
Fifth and sixth recording tracks Tn5. TR6, and the seventh and eighth recording tracks TR? , TR8 can be arranged at a distance of 13, respectively. ' Then, when the eighth recording track TR8 is formed and the drum 1 rotates four times, the driver drive control means 7
The heads 3 and 4 are simultaneously returned to the other side of the drum 1 in the axial direction, that is, in the other direction of the tape width (downward in FIG. 4) every predetermined distance 14° to the respective drivers 5 and 6. A signal to cause the transition is supplied. Then, as each of the heads 3 and 4 moves in response to the signal, the upper first magnetic head 3 is positioned at a height 147-distance downward from the seventh recording trunk TR7. , ninth recording track TR9
form. Further, the second magnetic head 4 is also
Similarly to the magnetic head 3, a first O.
0 forming the recording track TR+[+
- In this way, by moving the valley heads 3 and 4 in the other direction of the tape width by the driver drive control means 7, a plurality of pairs of the trough heads 3 and 4 are moved in the other direction of the tape width of the 10 magnetic tapes. recording track set, in this example the 9th and 1st O
Recording track TR9, Tn+o, 11th. and 12th
The recording tracks T, R11, TR12 and the thirteenth and fourteenth recording tracks TR13, TR14 can be arranged at a distance of 14, respectively. That is, as a result, the ninth and tenth recording tracks TR9+TR
1 [l is the fifth and sixth recording track THr.

TR6 and the seventh and eighth recording tracks Tn+, Tn
a, one recording track TRI of the 11th and 1st and 2nd
I.

TRIZ is the third and fourth recording track T Rs.
, TR48- and the fifth and sixth recording tracks TR5, Tna, and the thirteenth and fourteenth recording tracks Trus.

T'R14 is the first and second recording track TRI,
TR2, upper Hi3 and fourth recording track TR'3,
' They will be inserted between each of them and TR4.

When dubbing video signals of the recording trunks formed in this way, the positions of each trunk from the first recording track Tn+ to the fourteenth recording track TR4 on the magnetic tape 100 are independently determined. If 14 magnetic heads are provided to trace in the tape running direction, each track from the first recording track TR+ to the fourteenth recording track TR'14, ', and the first and '2 'Recording track TRI, TR2
, above 3rd and 4th recording track TR3','
TR4, the fifth and sixth recording tracks T Rs r
T no and the seventh and eighth recording tracks Tn7
．． The 15th and 16th recording tracks T old 5.'TR16,
17th and 18th record track record TR17, TR18
, 19th and 20th records □ Trunk T R'N+ '
, 'T'R20, and the 21st and 22nd recording tracks TR21 and TR22 can be traced at once by the respective heads, and the video signals of the respective recording tracks can be dubbed, and the dubbing time can be shortened. can.

Furthermore, since the azimuth angles of the first and second magnetic heads 3 and 4 are different, the recording azimuths of the tracks adjacent to the valley track are different, so crosstalk can be reliably prevented.

Further, as described above, by reciprocating the pair of magnetic heads 3 and 4 in both directions of the tape width to form recording tracks, high-density recording of video signals becomes possible.

Further, in this magnetic recording/reproducing device, the tape 1
It is sufficient to use a tape running system in which the tape 00 runs parallel to the peripheral surface 1A of the drum 1, and the mechanical installation of the rotating drum 1 requires less precision than the tape winding mechanism of a helical scan video tape recorder. can be easily secured.

In FIG. 4, one person indicates an audio track, and Tc indicates a reference signal track.

Next, other examples of recording patterns of recording tracks will be described with reference to FIG.

First, the driver drive control means 7 controls the distance 15 in advance.
The first and second magnetic heads 3 and 4 are set such that the second magnetic head 4 is higher than the first magnetic head 3.
, the first and second
A recording track T old 01° TR102 is formed. Then, the driver drive control means I causes each of the heads 3 and 4 to move forward in one direction in the axial direction of the drum 1 (upward in FIG. 5) every predetermined distance 16. In one direction of the tape width, a plurality of recording track sets, in this example, first and second recording tracks T
Rl0I, TR1G2, the third and fourth recording tracks TR103, TR104, and the fifth and sixth recording tracks TR105, TR106 can be arranged as a set at a distance of 16, respectively.

Then, when the second magnetic head 4 forms the sixth recording track TR106 and the drum 1 rotates three times, the driver drive control means 1 causes the driver 11 to drive the first magnetic head 3. A signal is supplied to the driver 6 to move the second magnetic head 4 a distance 17 upward in FIG. 5, and a signal is supplied to the driver 6 to move the second magnetic head 4 a distance 17 downward in FIG.

As a result, the first magnetic head 3 forms the seventh recording track TR107, and the second magnetic head 4 forms the eighth recording track TBlos.

When the eighth recording track TRX (Ill) is formed, the driver drive control means 7 causes the drivers 5 and 6 to move the heads 3 and 4 to the other side in the axial direction of the drum 1, that is, to the tape. Other width direction (lower direction in Figure 5)
A signal is supplied to cause the return movement to occur once every predetermined distance 18. Then, the heads 3 and 4 described above also track a plurality of recording track sets, in the other direction ζ of the tape width of the magnetic tape 100, in this example, the ninth and tenth recording track sets.
Recording tracks TR10Q, TRIIG and 11th
and the twelfth recording trunk TRIII, TR112
can be arranged at a distance of 18, respectively. That is, as a result, 12-the seventh and eighth recording tracks TR10? , T
ntoa is the fifth and sixth recording track TR10.
B, 9th and 1st O recording tracks T between Tl2O3
n+oe, TRIIG is the third and fourth recording track Tiuoa, TRI (between 14, 11th and 1st
The second recording rack Tom, T1112 is inserted between the first and second recording tracks Tn+o+, TR102.

Even if the recording track is formed in this way, high-density recording of the video signal is possible in the same way as in the previous example, the dubbing time can be shortened, and crosstalk can also be reliably prevented.

As is clear from the above description, the present invention provides a means for running a magnetic tape that slides in parallel to the circumferential surface of the rotating drum using a pair of magnetic heads that are reciprocally mounted in the axial direction of the rotating drum. It is characterized in that the recording azimuths of adjacent recording tracks are made to be different from each other so that a plurality of recording tracks are formed parallel to the tape width direction, and a plurality of recording tracks are formed parallel to the tape running direction. A plurality of recording tracks can be formed, allowing high-density recording of video signals. Further, each of the tracks can be traced at once using the number of magnetic heads suitable for each of the tracks, and the dubbing time can be shortened.

In addition, in this magnetic recording/reproducing device, it is sufficient to use a tape running system in which the tape runs in sliding contact with the surface of the drum, which is different from that of a conventional helical scan type video precoder. In comparison, mechanical mounting of the rotating drum can easily ensure accuracy.

[Brief explanation of the drawing]

Fig. 1 is a schematic plan view showing an embodiment of the present invention, Fig. 2 is a partially cutaway external perspective view showing a state in which a magnetic tape is wound around a rotating drum, and Fig. 3 is a magnetic tape according to the present invention. FIG. 4 is an enlarged plan view schematically showing a part of the recording track formed on the magnetic tape by the recording/reproducing device, and is an example of the recording pattern of the recording track formed on the magnetic tape by the magnetic recording/reproducing device according to the present invention. FIG. 5 is a plan view schematically showing another example of the recording pattern of the recording track formed on the magnetic tape by the magnetic recording/reproducing apparatus according to the present invention. DESCRIPTION OF SYMBOLS 1...Rotating drum, IA...Surrounding surface, 3, 4...Magnetic head, 100...Magnetic tape TRI, TR2,...... Recording track T R101, T R1 (12,......
・・Φ・・Recording track ±θ ・・・・・・・・・・・
・Anmasu ^. 11

Claims (1)

[Claims] A plurality of recording tracks are formed in parallel to the running direction of a magnetic tape that runs in sliding contact with the circumferential surface of the rotating drum by a pair of magnetic heads that are reciprocally movable in the axial direction of the rotating drum. In the magnetic recording/reproducing device, the azimuth angles of the pair of magnetic heads are made to be different from each other, and while the pair of magnetic heads are moved in one axial direction of the drum, the recording tracks corresponding to each of these heads are moved in the tape width direction. While forming multiple sets in one direction,
While moving the pair of magnetic heads in the other axial direction of the drum, another recording track is formed between the strings of the recording tracks of the set or between each recording track, and each recording track is formed as a set between adjacent recording tracks. A magnetic recording/reproducing device characterized in that the recording azimuths are made different.