JPH03113801A - Rotary head type recording and reproducing device - Google Patents

Abstract

PURPOSE:To allow the stabler execution of high-density recording and reproducing by forming the peripheral surface of a rotary drum to a circular conical surface and mounting a rotary head consisting of a pair of head elements facing each other on both sides of a recording medium to the rotary drum. CONSTITUTION:The peripheral surface of the circular conical type rotary drum 1 is formed of the circular conical surface and has the shape obtd. after the peak part of the circular conical body is cut within the surface plane to the axis of the circular cone. The 1st head element 4 of the rotary head is mounted to the base of the rotary drum 1 and the base end of an L-shaped head holding member 5 is supported to the end face on the peak part side of the rotary drum 1. The 2nd head element 6 of the rotary head is mounted to the position where the front end of the head holding member 5 faces the 1st head element 4. The high-density recording and reproducing are stably executed in this way while the tape recording medium 7 is pinched by the two head elements 4, 5 constituting the rotary head.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a rotary head type recording and reproducing device used for recording and reproducing video signals and audio signals, and particularly relates to a rotary head type recording and reproducing device used for recording and reproducing video signals and audio signals, and in particular, a rotary head type recording and reproducing device used for recording and reproducing video signals and audio signals. The present invention relates to a recording/reproducing device having a rotary head consisting of two head elements facing each other.

(Prior Art) When performing high-density recording in a magnetic recording/reproducing device, a magnetic head needs to scan a narrow track on a recording medium at high speed. In recording and reproducing apparatuses using magnetic tape as a recording medium, a helical scan method is known as a method for stably scanning the magnetic tape at high speed.

This is a method invented by Mr. Sawazaki and described in Japanese Patent Publication No. 34-171, and as shown in FIG.
It is mainly composed of The magnetic tape 17 is wound diagonally around the peripheral surface of the rotating drum 11 and a fixed drum 12 coaxially provided with the rotating drum 11 and runs in the longitudinal direction, and at the same time the rotating head 14 is moved along with the rotating drum 11 at high speed by the drum motor 13. be rotated.

As a result, the magnetic tape 17 is diagonally scanned at high speed by the rotary head 14.

At this time, as shown in FIG. 15, which is an expanded view of the circumferential surface of the rotary drum 11, the scanning locus on the magnetic tape 17, which can be set as the threshold for one rotation of one rotary head 14, is directed toward one side end of the magnetic tape 17. It originates from point A and ends at point B on the other side. Therefore, a part of the scanning trajectory from point A to point B is used for recording and reproduction.

As is well known, this helical scan method is now widely used in business and home VTRs (video tape recorders) as well as rotating head-type DATs (digital audio tape recorders).

By the way, the magnetic recording method currently in practical use is
As shown in Fig. 6, this is a longitudinal magnetic recording method in which a magnetic recording medium 17 is horizontally magnetized by a ring-shaped magnetic head 18, and this method is also used in rotary head-type recording and reproducing devices, such as the helical scan method mentioned above. method is used. In the in-plane magnetic recording method, adjacent magnetized areas cancel each other out, a so-called self-demagnetizing effect. This self-demagnetization becomes larger as the magnetized area becomes shorter and the linear recording density becomes higher, so it is a major factor that limits the recording density.

In contrast, the perpendicular magnetic recording method proposed by Mr. Iwasaki et al. in 1977 uses a perpendicular magnetic recording head as shown in Figure 17 to magnetize the recording medium in the perpendicular direction. This method achieves a much higher linear recording density than magnetic recording methods (S, Iwasakl, e.
t,al,:JEERTTransaction on
Magnetlcs, MAG-13,5, p, 1272
(1977)). The perpendicular magnetic recording head shown in FIG. 17 is composed of two magnetic poles called a main magnetic pole 19 and an auxiliary magnetic pole 20, and a magnetic recording medium is placed between the two magnetic poles 19 and 20.
Scanning is performed while sandwiching 7. If such a perpendicular magnetic recording head is used, magnetization is formed in a direction perpendicular to the surface of the magnetic recording medium 17, so that adjacent magnetized areas strengthen each other, so self-demagnetization is prevented. On the contrary, the higher the density of recording, the more advantageous it becomes.

This type of perpendicular magnetic recording head is called an auxiliary magnetic pole excitation type single magnetic pole head, and is one of the most effective magnetic heads for perpendicular magnetic recording.

Among recording and reproducing apparatuses that are always required to record at high density, there is a particularly strong demand for high-density recording in VTRs that handle video signals, which essentially have a large amount of information. Therefore, it is strongly desired to apply the perpendicular magnetic recording method to VTRs. However, when using a perpendicular magnetic recording head such as the auxiliary pole excitation type single magnetic pole head shown in FIG.
This is extremely difficult to achieve with the conventional helical scan method, as it requires high-speed scanning while sandwiching the images.

Now, if a perpendicular magnetic recording head as shown in FIG. 12 is applied to the helical scan method, as shown in FIGS. is held by the head holding member 15, and these two rotary heads 14.16 are assumed to be two magnetic poles 19.2-0. When the two rotating heads 14, 16 are rotated at high speed together with the rotating drum 11, the magnetic tape 14, 16 is placed between the two heads 14, 16.
It is considered that the magnetic tape 17 is scanned with the magnetic tape 7 sandwiched therebetween. This situation is shown in FIG. 20, in which the rotating drum 11 is expanded. The two opposing rotary heads 14 and 16 scan the magnetic tape 17 from point A on the upper end side to point B on the lower end side. However, during one rotation of the rotating head 14° 16, there always exists a point P where the connecting portion of the head holding member 15 to the rotating drum 11 comes into contact with the upper end of the magnetic tape 17.

Therefore, if the rotating drum 11 is rotated as it is, the point P
Then, the magnetic tape 17 comes into contact with the head holding member 15, making it difficult to run. This is an essential problem that cannot be avoided no matter how large the length g of the head holding member 15 is relative to the width a of the magnetic tape 4 or no matter how the tape 17 is wound. Therefore, it is extremely difficult to perform perpendicular magnetic recording by attaching the perpendicular magnetic recording head shown in FIG. 17 to a helical scan system.

On the other hand, along with the perpendicular magnetic recording method, the magneto-optical recording method is another recording method that can be expected to achieve ultra-high density recording. This method is already at the stage of practical use in an example using a disk-shaped recording medium. FIG. 21 shows a typical example of a magneto-optical recording/reproducing apparatus using a disk-shaped recording medium. In the figure, a magneto-optical disk 22 is rotated at high speed by a spindle motor 21. An optical head 23 and a magnetic head 24 are arranged to face each other with the magneto-optical disk 22 in between. The magnetic head 24 is for generating a magnetic field, and magnetizes the top of the magneto-optical disk 22. The optical head 23 includes a laser light source, an optical system, a photodetector, etc.
Heat is applied to the recorded portion from the back side of the disk 22 to selectively cause magnetization reversal, and during reproduction, the polarization angle (Kerr rotation angle) of the laser beam reflected by the disk 22 is detected and a reproduced signal is extracted.

When using a disk-shaped recording medium, magneto-optical recording can be performed with this configuration, but when applying magneto-optical recording to a helical scan method using a tape-shaped recording medium, the recording medium must be A structure sandwiching the optical head and the magnetic head is required, and problems similar to those in perpendicular magnetic recording occur.

(Problem to be Solved by the Invention) As described above, the helical scan method used in the conventional rotary head type recording/reproducing device scans a flexible tape-shaped recording medium relatively stably and with high density. However, when applied to perpendicular magnetic recording and magneto-optical recording, in which recording and reproduction are performed by sandwiching a recording medium between two head elements that make up a rotating head, it is difficult to hold one head element. There has been a problem in that it is extremely difficult to do so because the head holding member interferes with the medium.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary head type recording and reproducing apparatus that can stably perform high-density recording and reproducing using a rotary head consisting of a pair of head elements facing each other with a tape-shaped recording medium in between.

[Structure of the Invention] (Means for Solving the Problems) The present invention has the following features: by winding a tape-shaped recording medium around the circumferential surface of a rotating drum, rotating the rotating drum, and running the tape-shaped recording medium in the longitudinal direction, In an apparatus for recording and reproducing, the peripheral surface of a rotating drum is basically a conical surface, and a rotating head consisting of a pair of head elements facing each other with a recording medium in between is attached to the rotating drum.

In the present invention, a tape-shaped recording medium is divided into at least two strip-shaped regions arranged in the width direction, and a recording/reproducing circuit is provided for recording and reproducing different signals for each of these strip-shaped regions via a rotary head.

According to one embodiment of this recording/reproducing circuit, a recording medium is divided into two strip-shaped areas arranged in the width direction, and recording/reproduction is performed by selectively using the strip-shaped area on either side.

In this case, the recording and reproducing apparatus is configured so that the positional relationship between both edges of the tape-shaped recording medium can be arbitrarily reversed.

According to another aspect of the recording and reproducing circuit, signals are simultaneously recorded in at least two band-shaped areas via different rotating heads, and signals recorded in at least two band-shaped areas are recorded in at least two band-shaped areas via different rotating heads. play at the same time.

(Function) When the tape-shaped recording medium is wound around the conical surface of the rotating drum and run, the scanning locus of the rotating head during one rotation of the rotating drum is directed toward one side edge of the recording medium. originates from and ends on the same side.

In other words, since the circumferential surface of the rotating drum is a conical surface, the tape-shaped recording medium enters and wraps around the circumferential surface of the rotating drum from the bottom side toward the top side, and then turns around and wraps around the circumferential surface of the rotating drum again toward the bottom side. It travels towards the target and eventually separates from the circumferential surface of the rotating drum.

In this process, the recording medium passes between two opposing head elements forming a rotary head, and a scanning locus as described above is formed. Therefore, when the recording medium runs on the circumferential surface of the rotating drum, it is not interfered with by the head holding member that holds one of the head elements, and runs stably. In this way, it is possible to stably run the tape-shaped recording medium while sandwiching it between the two head elements of the rotary head, and to perform high-density recording and reproduction.

Furthermore, the tape-shaped recording medium is divided into at least two strip-shaped areas lined up in the width direction, recording and reproduction are performed using only the strip-shaped areas on either side of the recording medium, and the positional relationship between both edges of the recording medium is By reversing , the track patterns in the two strip areas will be almost the same, so the recording density (
track pitch) is almost uniform over the entire surface of the recording medium,
As a result, high areal recording density is achieved.

Furthermore, multi-track recording can be achieved by simultaneously recording signals in each strip area via different rotating heads, and by simultaneously reproducing the signals recorded in each strip area via different rotating heads. It is now possible to play
This is advantageous when recording and reproducing wideband video signals such as high-definition television signals.

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a perspective view showing a rotary head assembly which is a main part of a rotary head type recording/reproducing apparatus showing the basic structure of the present invention, and FIG. 2 is a side view thereof. The conical rotating drum 1 has a circumferential surface formed by a conical surface. This rotating drum 1 has a shape in which the top of a cone is cut in a plane parallel to the axis of the cone.

A conical stationary drum 2 is provided below the rotating drum 1. The circumferential surface of the fixed drum 2 is formed by a conical surface that is an extension of the conical surface that is the circumferential surface of the conical rotary drum 1. A drum motor 3 is arranged below the fixed drum 2. This drum motor 3 is for rotationally driving the rotating drum 1, and its rotating shaft passes through the inside of the fixed drum 2 and is connected to the rotating drum 1.

At the bottom of the rotating drum 1, a first head element 4 of the rotating head is attached.

Further, a base end portion of an L-shaped head holding member 5 is supported on the end surface on the top side of the rotating drum 1, and a rotatable portion of the head holding member 5 is placed at a position facing the first head strand 4 at the distal end portion of the head holding member 5. A second head element 6 in the head is attached.

Here, the first and second head rods 4 and 6 are used, for example, in the case of a perpendicular magnetic recording system using a perpendicular magnetic recording head (auxiliary pole excitation type single magnetic pole head) as shown in FIG. In this case, one side is the main magnetic pole 19 and the other side is the auxiliary magnetic pole 20.
It is. Furthermore, taking as an example the case of the magneto-optical recording method shown in FIG. 16, one of the head elements 4.6 is connected to the optical head 2.
3. The other is a magnetic head 24 for generating a magnetic field.

A tape-shaped recording medium 7, for example, a magnetic tape, is wound around the circumferential surfaces of the rotating drum 1 and the stationary drum 2, and is driven to run in the longitudinal direction by a tape drive mechanism (not shown). At this time, the recording medium 7 is scanned at high speed by the head element 4.6 of the rotary head that rotates together with the rotary drum 1, and information signals such as video signals and audio signals are recorded on the recording medium 7. The information signal recorded on the medium 7 is reproduced.

In the above configuration, since the circumferential surface of the rotating drum 1 is a conical surface, the tape-shaped recording medium 7 is formed on the circumferential surfaces of the rotating drum 1 and the fixed drum 2 from the bottom side to the top side when focusing on one point in the longitudinal direction. It enters toward the side, wraps around, then reverses and travels toward the bottom side, and finally separates from the circumferential surfaces of the rotating drum 1 and the fixed drum 2. Therefore, the scanning locus of the rotary head on the recording medium 7 is as shown in FIG. 3, for example.

FIG. 3 shows the developed circumferential surface of the conical rotating drum 1, including head elements 4, 6, head holding member 5, and tape-shaped recording medium 7.
The circumferential surface of the rotating drum 1 is shown in a fan shape, and the head element 4.6 is located on the outer periphery of the fan shape.

The rotation of the rotary drum 1 and the head elements 4.6 corresponds in FIG. 3 to a movement of the head elements 4, 6 along the sector-shaped outer circumference. The head element 4.degree.6 scans over the recording medium 7 along a trajectory in contact with the recording medium 7.

That is, if the running speed in the longitudinal direction of the recording medium 7 is much smaller than the normal scanning speed due to the rotation of the head element 4.6 (for example, even though the former is several meters per second or more) On the other hand, the latter is several (1) or less per second), and the scanning trajectory of the head element 4.6 is such that the outer periphery of the fan shape along which the head element 4.6 moves intersects with one side edge of the tape-shaped recording medium 7. It starts at point A and ends at point B on the same side. Information signals are recorded and reproduced using part or all of this scanning trajectory between AB.

According to the above configuration, there is no need to wind the tape-shaped recording medium diagonally around the rotating drum as in the conventional helical scan method, and the stress applied to the recording medium is reduced. It becomes possible to implement the method of scanning a recording medium by sandwiching the recording medium between two heads with a rotary head type recording/reproducing apparatus using a tape-shaped recording medium.

That is, regarding the latter point, it is necessary to use one head element of the rotating head as the second head element 6 and hold it with the arm of the head holding member, so interference between the head holding member 5 and the tape-shaped recording medium 7 must be considered. There is a need to. However, according to the configuration of this embodiment, when the recording medium 7 is wound around the conical rotating drum 1 and the fixed drum 2, the recording medium 7 first wraps around the fixed drum 2.
It enters onto the circumferential surface of the rotating drum 1 from the bottom side toward the top side, and then onto the circumferential surface of the rotating drum 1 from the bottom side toward the top side. Thereafter, the tape-shaped recording medium 7 passes between the head elements 436 and then reverses toward the bottom side of the rotary drum 1, and then passes over the bottom side of the fixed drum 2, and then passes over the circumferential surface of the fixed drum 2. depart from.

Therefore, as shown in FIG.
If the distance X is greater than the difference between the apex O of the cone and the upper edge of the recording medium 7, that is, 0>r-x, then the will no longer come into contact with the head holding member 5. In other words, the problems explained using FIGS. 18 and 19 when the technique of recording by sandwiching a tape-shaped recording medium between two opposing heads is applied to the helical scan method are solved, and the recording medium 7 It can run stably.

In the above basic explanation, the case where there is one rotary head consisting of the first and second head elements 4 and 6 facing each other is shown, but in reality, as shown in the specific example described below, A plurality of rotating heads are provided.

FIG. 4 is a circuit diagram of a recording/reproducing circuit provided in the rotary drum 1 in the first embodiment of the present invention, and shows an example in which six rotary heads HO to H5 are used. Each of the rotating heads HO to H5 has a recording/playback amplifier AO to
A5 is connected to the recording/reproducing amplifiers AO to A5, and one end of each of switch circuits SWO to SW5 is connected to the recording/reproducing amplifiers AO to A5, respectively. Switch circuits SWO to SW5 are controlled by switch pulses from digital logic circuit DL. The digital logic circuit DL is operated by a start pulse and a clock pulse supplied from the outside via a slip ring (not shown). switch circuit SWO
One end of a rotary transformer RT is connected to each other end of SW5, and the other end of the rotary transformer RT is connected to a recording signal generation circuit during recording and to a reproduction signal receiving circuit during reproduction.

FIG. 5 is an input/output timing chart of the digital logic circuit DL. A start pulse applied to the digital logic circuit DL as an input signal INO is generated every rotation of the rotary drum 1, and six clock pulses applied as an input signal INI are generated per rotation in synchronization with the start pulse. Digital logic circuit DL
synchronizes with the start pulse and generates a switch pulse of a constant width from the rising edge of each clock pulse as output signals 0UT0 to 0UT5.

Therefore, during recording, the recording signal is transferred to the switch circuits SWO~S.
By sequentially supplying the signal to the rotary heads HO to H5 via W5 and the recording amplifier section of the recording/playback amplifiers AO to A5, each rotary head HO to H5 covers a range of 1/6 of the entire circumference of the rotary drum 1. The signal is recorded, and as a result, the signal is recorded on the recording medium 7 along the rotary head scanning locus shown by the broken line in FIG. In this case, the size of the rotating drum 1 and the winding of the recording medium 7 around the rotating drum 1 (position and height) are adjusted so that the range in which the scanning locus is drawn is the band-shaped area 8A in the upper half of the width of the recording medium 7. By setting, the image shown in FIG. 7(a) is applied only to the strip area 8A.
The signal is recorded as follows. Furthermore, when similar recording is performed with the positional relationship of both edges of the recording medium 7 reversed, a signal is recorded only in the lower half band-shaped region 8B in FIG. 6, as shown in FIG. 7(b). In order to reverse the positional relationship between both edges of the recording medium 7, for example, the recording medium 7 may be made into a cassette with a symmetrical structure, and the cassette may be taken out of the apparatus, turned over, and reloaded.

On the other hand, during reproduction, the switch circuits SWO to SW5 are similarly controlled by switch pulses, so that the signals reproduced by the rotary heads HO to H5 are transferred to the recording/reproduction amplifier A.
The signal is extracted as a reproduction signal via reproduction amplifier sections O to A5.

Here, the recording medium 7 is not divided into regions in the width direction, and the scanning locus of the rotary head on the recording medium 7 accompanying one rotation of the rotary drum 1 is as shown in FIG. In the case of a configuration in which a trajectory starts from the side and reaches near the bottom edge of the recording medium 7, the track pitch is relatively large in the upper area of the recording medium 7, but the track pitch is relatively large in the lower area of the recording medium 7. Since the track pitch is almost parallel to the longitudinal direction, the track pitch becomes very small, making it virtually impossible to use for recording and reproduction.

On the other hand, according to the present embodiment, since recording and reproduction are performed only in one of the widthwise half band-shaped areas 8A and 8B depending on the running direction of the recording medium 7, the two band-shaped areas 8A and 8B are used. The track patterns in 8B are almost the same as shown in FIG. 7, and the recording density (track pitch) is almost uniform over the entire surface of the recording medium 7. Therefore, recording medium 7
Almost the entire upper surface can be used for recording and reproduction, and as a result, the areal recording density can be increased.

Next, a second embodiment of the present invention will be described with reference to FIGS. 9 to 13. FIG. 9 is a circuit diagram of a recording/reproducing circuit provided in the rotary drum 1 in the second embodiment of the present invention, and as in the case of FIG. 4, six rotary heads HO to H5 are connected.
An example is shown using . Rotating head HO~H5
are connected to recording/playback amplifiers AO to A5, respectively.
The recording/reproducing amplifiers AO to A5 are provided with switch circuits SAO to SA5. of two systems (channels) A and B, respectively. S.B.O.
Each end of ~SB5 is connected. switch circuit SA
O~SA5 are controlled by switch pulses from the digital logic circuit DLA, and switch circuits SBO~S
B5 is controlled by a switch pulse from digital logic circuit DLB. Digital logic circuit DL
A, DLB is operated by a start pulse and a clock pulse supplied from the outside via a slip ring (not shown). A rotary transformer R is provided at each other end of the switch circuits SAO to SA5 and each other end of 5BO to SB5.
One end side of TA and RTB are connected, and rotary transformer R
The other ends of TA and RTB are connected to a recording signal generation circuit during recording and to a reproduction signal receiving circuit during reproduction.

Figure 5 shows a digital logic circuit DLA.

3 is a timing chart of input and output of DLB.

Input signal IN to digital logic circuits DLA and DLB
The start pulse given as O is 1 of the rotating drum 1.
The clock pulse that is generated every rotation and given as the input signal INI is synchronized with the start pulse and is generated at 6 clock pulses per rotation.
occurs.

The digital logic circuit DLA generates a switch pulse of a constant width as output signals AOUTO to AOUT5 from the rising edge of each clock pulse in synchronization with the start pulse, and the digital logic circuit DLB similarly generates a clock pulse in synchronization with the start pulse. A switch pulse of a constant width is applied to the output signals AOUTI') to AO of the digital logic circuit DLA from the respective rising points of
It is generated as output signals BOUTO to BOUT5 delayed from UT5.

Therefore, during recording, the recording signal of the A channel is sent to the switch circuits SAO to SA5 and the recording/playback amplifiers AO to A5.
The recording signal of the B channel is sequentially supplied to the rotary heads HO to H5 through the recording amplifier section of the switch circuit S.
1/12 of the entire circumference of the rotary drum 1 is sequentially supplied to the rotary heads HO to H5 via the recording amplifier sections of the recording/reproducing amplifiers AO to A5 and the recording/reproducing amplifiers AO to A5. A signal is recorded in each range, and as a result, the signal is recorded on the recording medium 7 along the scanning locus of the rotary head shown by the broken line in FIG.

In this case, A for rotary heads HO to H5.

By shifting the phase of the supply timing of the recording signals of both channels B by an appropriate amount as shown in FIG.
As shown in Figure 1, the recording signal of the A channel is recorded on the recording medium 7.
At the same time, the recording signal of the B channel is recorded in the strip area 8A in the upper half of the width direction.
It is recorded in B.

On the other hand, during playback, switch circuits SAO to SA5. S.B.O.
~SB5 is also a digital logic circuit DLA, DL
By being controlled by the switch pulse from B, the signals simultaneously reproduced from the strip areas 8A and 8B by the rotary head HO-H5 are taken out as reproduction signals via the reproduction amplifier sections of the recording/reproduction amplifiers AO to A5. .

FIG. 12 shows the scanning trajectories of the rotary heads H0 to H5 in this embodiment in a developed view of the circumferential surface of the rotary drum 1, similar to FIG. 3. In this example, the rotating head HO~
At least two of H5 are scanning the recording medium 7 at the same time.

For example, in FIG. 12, while the rotary head H1 is scanning the upper half band-shaped area 8A from point A1 to A2, the rotating head H3 is scanning the lower half band-shaped area 8B from point B3 to 84. During this scanning, if the rotary heads H1 and H3 perform recording and reproduction simultaneously using a recording and reproduction circuit as shown in FIG. 9, multi-track recording and reproduction can be realized. In this case, recording and reproduction are performed on the recording medium 7 on a track pattern as shown in FIG.

In addition, in FIG. 12, the rotary head H] is the lower half strip area
While scanning the area B from point B1 to point 82, the rotary head H3 is scanning the top half of the strip area 8A from point A3 to A4. Therefore, even if the rotary heads H1 and H3 perform recording and reproduction simultaneously during this scanning using a recording and reproduction circuit as shown in FIG. 9, multi-track recording and reproduction can be similarly realized. In this case, recording and reproduction are performed on the recording medium 7 on a track pattern as shown in FIG.

When recording and reproducing high-bandwidth video signals such as high-definition television signals, multi-track recording and reproducing using multiple rotating heads is required, but when a rotating drum with a conical circumferential surface is used as in the present invention, As described above, it is possible to realize multi-track recording and playback by simultaneously recording different signals in a plurality of band-shaped areas on the recording medium 7 and simultaneously playing back the signals recorded in this way. It becomes possible.

In addition, in the above-mentioned embodiment, the rotating drum is arranged on the upper side and the fixed drum is arranged on the lower side, but the rotating drum may be arranged on the lower side and the fixed drum on the upper side.
Also, the fixed drum may be omitted.

Furthermore, technical measures similar to those of conventional rotary head type recording and reproducing devices have been added as appropriate, such as forming leads on the drum circumferential surface to guide the tape-shaped recording medium and forming grooves to control airflow. You can also.

In addition, the present invention can be implemented with various modifications without departing from the scope of the invention.

〔Effect of the invention〕

According to the present invention, it is possible to stably perform high-density recording and reproduction while holding a tape-shaped recording medium between two head elements constituting a rotary head.

Therefore, ultra-high density recording technologies such as perpendicular magnetic recording using an auxiliary pole-excited single-pole head and magneto-optical recording, which were difficult to apply to the helical scan method, can now be used in rotary head recording and reproducing devices. It is extremely effective for recording and reproducing devices such as signals.

Further, according to the present invention, a tape-shaped recording medium is divided into at least two strip-shaped areas lined up in the width direction, recording and reproduction are performed using only the strip-shaped area on one side, and both edges of the recording medium are By reversing the positional relationship, the track patterns in the two band-shaped areas can be made almost the same, the recording density (track pitch) can be made almost uniform over the entire surface of the recording medium, and the areal recording density can be increased.

Furthermore, multi-track recording and playback is possible by simultaneously recording signals in each of a plurality of strip-shaped areas via different rotating heads, and by simultaneously reproducing the signals recorded in each strip-shaped area via different rotating heads. Become. Therefore, it is suitable for a video playback device that digitizes and records and plays back a wideband video signal such as a high-definition television signal.

[Brief explanation of drawings]

1 and 2 are a perspective view and a side view showing the basic structure of the present invention, and FIG. 3 shows the conical rotating drum shown in FIGS. 4 is a diagram showing the configuration of a recording/reproducing circuit in the first embodiment of the present invention, FIG. 5 is a timing diagram for explaining the operation of FIG. 4, and FIG. 6 is a diagram showing the same. FIGS. 7(a) and 7(b) are diagrams showing the scanning trajectory of the rotary head on the recording medium in the embodiment, and FIGS.
The figure shows a track pattern when the recording medium is not divided into strip areas, FIG. 9 shows the configuration of the recording/reproducing circuit in the second embodiment of the present invention, and FIG. 10 shows the operation of FIG. 9. FIG. 11 is a diagram showing the scanning locus of the rotary head on the recording medium in the same embodiment, and FIG. 12 is a diagram showing the rotating drum in the same embodiment along with the scanning locus of the rotary head. Figure 13(a) (
b) is a diagram showing the track pattern of each strip area on the recording medium in the same embodiment, FIG. 14 is a perspective view showing a conventional helical scan type tape scanning mechanism, and FIG. 15 is a diagram showing the rotating drum of FIG. 14. FIG. 16 is a diagram for explaining the conventional longitudinal magnetic recording method; FIG. 17 is a diagram for explaining the conventional perpendicular magnetic recording method; FIGS. 18 and 19 The figure is a perspective view and a sectional view showing an example in which the perpendicular magnetic recording system is applied to a conventional helical scan type tape scanning mechanism.
FIG. 9 is an exploded view showing the rotating drum together with a rotating head, a head holding member, and a tape-shaped recording medium, and FIG. 21 is a diagram for explaining the conventional magneto-optical recording system. DESCRIPTION OF SYMBOLS 1... Conical rotating drum, 2... Conical fixed drum, 3... Drum motor, 4, 6... Head element of rotating head, 5... Head holding member, 7... Tape shaped recording medium, 8A, 8B... strip-shaped area, 19... main magnetic pole, 20... auxiliary magnetic pole, 23... optical head, 24
... Magnetic head, HO to H5 ... Rotating head, AO
~A5... Recording/playback amplifier, SWO~SW5. S.A.
O~SA5. SBO~SB5...Switch circuit, DL
, D.L.A. DLB...Digital logic circuit, RT. RTA, RTB...Rotary transformer.

Claims (2)

[Claims] (1) A rotating drum whose circumferential surface is formed by a conical surface; a tape-shaped recording medium that is wrapped around the circumferential surface of the rotating drum and runs in the longitudinal direction; and a tape-shaped recording medium that is attached to the rotating drum and that sandwiches the recording medium. a plurality of rotary heads each consisting of a pair of head elements facing each other; and dividing the recording medium into at least two strip-shaped regions lined up in the width direction, and recording and reproducing different signals in each strip-shaped region via the rotary head. 1. A rotary head type recording/reproducing device comprising: a recording/reproducing circuit. (2) a rotating drum whose circumferential surface is formed by a conical surface; a tape-shaped recording medium that is wound around the circumferential surface of the rotating drum and runs in the longitudinal direction; and a tape-shaped recording medium that is attached to the rotating drum and holds the recording medium between the two sides. a plurality of rotating heads each consisting of a pair of head elements facing each other; and dividing the recording medium into two strip-shaped areas lined up in the width direction;
a recording/reproducing circuit for selectively using a band-shaped area on either side of the recording medium to record/reproduce signals via the rotary head; and means for reversing the positional relationship between both edges of the recording medium. A rotary head type recording/reproducing device comprising: