JPH07320350A - Magnetic recording/reproducing apparatus - Google Patents

Abstract

PURPOSE:To reduce the size of a magnetic recording/reproducing apparatus and avoid the twist of a magnetic tape by arranging a drum so as to have an inclination to a reference plane in a direction approximately perpendicular to a plane including the cross points of the rotary axis of the drum and two guide planes by an angle corresponding to a lead angle. CONSTITUTION:When a cassette 3 is loaded onto an apparatus 4, a magnetic tape 2 is drawn out of the cassette 3 by posts 5, 9, 10, 7, 11 and 12 in the opening 3c of the cassette 3 and wound on a drum 1. The drum 1 is inclined in a direction B approximately parallel with a center line 3e connecting the centers of reels 3a and 3b by an angle equal to a lead angle alpha. With this constitution, the surface of the drum 1 which faces closely the magnetic tape 2' stretched on the front surface of the cassette 3 is parallel with the tape 2' and the drum 1 can be brought close to the cassette 3. Therefore, the size of the apparatus can be reduced and, further, the twist of the magnetic tape can be avoided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus for recording / reproducing by winding a magnetic tape on a drum.

[0002]

2. Description of the Related Art A conventional magnetic recording / reproducing apparatus is shown in FIG. 16 and will be described with reference to FIG.

Reference numeral 116 is a cassette containing a magnetic tape. First, the magnetic tape is pulled out to a state of 117 by the posts 101 and 102. Next, the post 104,
105 along the trajectories of 114 and 107, respectively.
The magnetic tape in the state 7 is further pulled out to 119 and 120, and the magnetic tape is wound around the drum 108. 1
12 is a capstan that drives a magnetic tape, and 10
Reference numerals 9 and 110 denote fixed heads. The drum 108 is inclined in the direction of arrow 121 by a lead angle. Therefore,
The post 102, the fixed heads 109 and 110 to the take-up reel 122b are all perpendicular to the paper surface.

[0004]

However, in the above-mentioned structure, one of the posts for guiding the tape wound around the drum is a vertical post, which is seen at point A in FIG. In addition, there is a problem that the device becomes very large. Further, in the process of winding the magnetic tape around the drum, the magnetic tape is twisted,
There was a problem that tape damage occurred.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic recording / reproducing apparatus which can solve the above problems and improve the operability of the apparatus.

[0006]

In order to achieve this object, the magnetic recording / reproducing apparatus of the present invention has a first guide for dividing the winding angle of the magnetic tape around the drum formed on the outer peripheral surface of the drum into two substantially equal parts. And a second guide surface, a first post group for winding the magnetic tape around the first guide surface, and a second post group for winding the magnetic tape around the second guide surface,
At least one of each of the first and second post groups has an inclined post around which a magnetic tape is spirally wound, and the drum has a rotation axis of the drum with respect to the first reference plane and the first and second post groups. The arrangement is such that the lead angle is tilted in a direction substantially perpendicular to the plane including the intersection with the second guide surface.

[0007]

According to the present invention, in the above-described structure, the stable running condition of the tape can be satisfied by the simple mechanism during the loading process of the magnetic tape onto the drum, and the small magnetic recording which suppresses the tape damage during the tape loading. Enables playback equipment.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the magnetic recording / reproducing apparatus of the present invention will be described with reference to FIGS. Reference numeral 1 denotes a drum which guides the magnetic tape 2 in a spiral shape along a lead 1c at a predetermined angle, and on which a magnetic head (not shown) is mounted, a rotary shaft 1
It is composed of a rotating drum 1a having f and a fixed drum 1b having a lead 1c. Reference numeral 3 is a cassette around which the magnetic tape 2 is wound, and is composed of a supply reel 3a and a take-up reel 3b which are arranged in parallel to the plane of the cassette bottom surface 3d. First, when the cassette 3 is mounted on the device 4, the posts 5, 9, 1 shown by broken lines in the opening 3c called a mouse of the cassette 3 are shown.
The magnetic tape 2 is pulled out from the cassette 3 and wound around the drum 1 by 0, 7, 11, and 12.

The drum 1 is tilted by an angle equal to the lead angle α in a direction B substantially parallel to the center line 3e connecting the centers of the two reels 3a and 3b. As a result, the magnetic tape 2 ′ stretched on the front surface of the cassette 3 and the drum 1 close to
The opposite surface of the drum is parallel to the magnetic tape 2'and the drum 1
Can be brought closer to the cassette 3 direction, and the size of the device can be reduced.

In FIGS. 1 and 3, the magnetic tape 2 is wound around the supply side guide surface 1d of the drum 1 by the roller posts 5, 6, 9 and the inclined post 11, and is wound around the take-up side guide surface 1e. Is a small traveling system that uses roller posts 7, 8 and 10 and inclined posts 12.

The rotating shaft 1f of the drum 1 and the feed side guide surface 1d
1h including an intersection 1g between the winding-side guide surface 1e and the winding-side guide surface 1e
On the other hand, the inclination direction B of the drum 1 is substantially vertical, and the supply-side guide surface 1d and the take-up side guide surface 1e are formed by dividing the winding angle of the magnetic tape 2 around the drum 1 into two substantially equal parts. .

FIG. 4A is a plan view of the device 4 showing a state where the winding angle of the magnetic tape 2 around the drum 1 is 0 degree.
(B) is a front view of the apparatus 4 as seen from the direction of the cassette 3, the cassette 3 is omitted, and the magnetic tape 2 is also shown by a broken line. The posts 5, 6, 7, 8, 9, 10 are flanges (subscript a,
b) and is in the cassette mouse 3c, it is arranged substantially perpendicular to the reference plane 3f constituted by the widthwise center of the magnetic tape 2 wound on the supply reel 3a and the take-up reel 3b. There is. Further, the roller post 9 and the inclined post 10 are supported on the same slider (not shown) and move in parallel with the reference plane 3f. Roller post 1
Similarly, 1 and the inclined post 12 are also supported on the same slider (not shown), and move in parallel with the reference plane 3f. That is, the roller posts 9 and 10 are always in the reference plane 3
It has an axis perpendicular to f,
12 is always about 23 degrees with respect to the reference plane 3f,
It is tilted 18 degrees.

FIG. 5 is a plan view showing the moving state of the roller posts 5, 6, 7, and 8. The wrap angle on the drum is shown in FIG.
(A), FIG. 5 (b), and FIG. 5 (c), respectively, about 0 degrees,
It is in a state of 100 degrees and 180 degrees.

FIG. 6 is a front view of the state of FIG. 5 seen from the direction of the cassette 3. In the figure, roller posts 5,
6 is supported by a drive arm 16 which rotates about a shaft 20 provided on a chassis (not shown). The roller post 5 is fixed to a post guide portion 16a provided at the tip of the drive arm 16, and the roller post 6 is a post at the tip of an arm 18 rotatably supported around the post guide portion 16a of the drive arm 16. It is fixed to the guide portion 18a. Further, the shaft 20 is provided with a threaded portion 20a, and the rotation of the drive arm 16 causes the drive arm 16 to move in the axial direction of the shaft 20. When the drive arm 16 rotates clockwise in FIG. 5, the drive arm 16 moves in the arrow U direction. Thereby, in the process of winding the magnetic tape 2 around the drum 1 by the roller posts 5 and 6, the height of the posts 5 and 6 in the axial direction is made equal to the lead portion 1e of the drum 1. Further, the arm 18 is biased by a torsion spring (not shown) counterclockwise around the post guide portion 16a, and the position of the arm 18 is regulated by a rotation regulating portion (not shown).

The structure of the roller posts 7 and 8 is the same as that of the roller posts 5 and 6. That is, the roller post 7 is fixed to the post guide portion 17a of the drive arm 17, and the roller post 8 is fixed to the post guide portion 19a of the arm 19 rotatably supported around the post guide portion 17a. In FIG. 5, when the drive arm 17 rotates counterclockwise, the drive arm 17 moves in the arrow D direction.

To drive the drive arms 16 and 17, there are gear parts 16b and 17b at one end of the drive arms 16 and 17,
It is driven by a separate drive gear (not shown).

In FIG. 2, the roller posts 5, 6, 7, and 8 shown by the broken lines are arranged so that the roller posts 5 and 7 are located in the cassette mouse 3c so that the shaft 20 and the drive arms 16 and 1 can be positioned.
Approximately 5 mm in the direction of moving 7 closer to the cassette 3 with respect to other figures
It is configured to move.

In FIG. 2, FIG. 4 (a) and FIG. 4 (b),
The roller post 9 and the inclined post 10 are set up on a slider (not shown) and move parallel to the reference plane 3f. Similarly, the roller post 11 and the inclined post 12 are also erected on a slider (not shown) and move parallel to the reference plane 3f.

By arranging the drum 1 in this manner, the roller posts (5 to 10) and the inclined posts (11, 12) are twisted on the magnetic tape 2 at positions corresponding to the winding angle of the magnetic tape 2 on the drum 1. Can be arranged without giving. That is, as the winding angle of the magnetic tape 2 around the drum 1 becomes smaller, the posts (5 to 12) are placed in the cassette 3
It can be arranged at a position closer to, and the mechanism can be simplified.

The operation of winding the magnetic tape 2 around the drum 1 will be described in detail. The tape 2'in the cassette 3 is a surface perpendicular to the reference plane 3f, and the post that comes into contact when pulling out the magnetic tape 2'is not parallel to the surface of the magnetic tape 2 '. . Therefore, first, the magnetic tape 2 is pulled out to the position where the magnetic tape 2 is wound around the drum 1 with the roller posts 9 and 11 and the tilted posts 10 and 12 at an angle of about 0 degree. At this time, the winding angle of the magnetic tape 2 around the inclined posts 10 and 12 is also 0 degree. Further, the shaft 20 and the drive arms 16 and 17 are moved in the direction of arrow J by about 5 mm to obtain the state of FIG. In FIGS. 4A and 4B, the drum 1 is inclined by a lead angle α in a direction substantially parallel to the center line 3e, and an intersection 1g of the lead portion 1c with the supply side guide surface 1d and the winding side guide surface 1e. Since the height of the magnetic tape 2 is matched with the tape lower end portion 2a of the magnetic tape 2'in the cassette 3, the magnetic tape 2 in contact with the drum 1 is present on the lead 1c, and the tape is formed by riding on the lead 1c. No damage occurs. Next, when the roller posts 5 and 6 are in the cassette mouse 3c by the drive arms 16 and 17 which rotate about the drive arm rotating shaft 20 provided coaxially with the rotating shaft 1f of the rotating drum 1a. When the loading is completed, the posture is substantially perpendicular to the reference surface 3f, and the lead angle α can be tilted toward the cassette 3 direction. Similarly, the roller posts 7 and 8 can be placed in a posture in which the lead angle α is inclined in a direction substantially opposite to the cassette 3. Further, the roller posts 5, 6, 7 and 8 are moved in the axial longitudinal direction of the shaft 20 by the screw portion 20a of the shaft 20 in the winding process around the drum 1. By this movement, the roller posts 5, 6, 7, 8 can be arranged in the direction in which the magnetic tape 2 wound along the lead portion 1c is emitted from the drum 1. Therefore, the magnetic tape 2 is not twisted between the drum 1 and the roller posts 5, 6, 7, 8 at all, and the lower end of the magnetic tape 2 along the lead portion 1c and each roller post (5, 6, 7, 8). The loading operation is performed with the heights of the lower flange portions (5b, 6b, 7b, 8b) always being the same.

Further, from the roller posts 6 and 8 to the cassette 3
In order to convert the magnetic tape 2 toward the reference plane 3f in the cassette 3, the inclination direction of the inclined posts 10 and 12,
The magnetic tape 2 is moved to the front of the cassette 3 while controlling only the winding angle of the magnetic tape 2 around the inclined posts 10 and 12, and the magnetic tape 2 is guided to the drum 1 without twisting the magnetic tape 2 from the cassette 3. ing. Therefore, the inclination angle of the inclined posts 11 and 12 with respect to the reference plane 3f is always constant.

The pinch roller 13 also moves from inside the mouse 3c, holds the magnetic tape 2 between the capstans 14 and drives the magnetic tape 2 in its longitudinal direction. Reference numeral 15 is a tension post for controlling the tension of the running magnetic tape 2.

Reference numeral 21 is a recording / reproducing means for recording / reproducing a signal on the magnetic tape 2 by a magnetic head (not shown) mounted on the drum 1.

Another embodiment based on the above-mentioned device 4 is shown in FIGS. FIG. 7 shows a main part of the device 4 during the loading process in which the winding angle of the magnetic tape 2 around the drum 1 is about 100 degrees. Further, FIG. 8 shows a state in which the magnetic tape 2 is wound only around the winding side guide surface 1e.
The state in which the magnetic tape 2 is wound only on the supply side guide surface 1d is shown in FIG. FIG. 7 shows a state in which the loading operation is stopped during the winding of the magnetic tape 2 around the drum 1 in the device 4 shown in FIG. In the tape path of the magnetic tape 2 shown in FIG. 8, only the supply-side posts (5, 6, 9, 11) of the device 4 shown in FIG. 1 are driven to the position shown in FIG. In addition, FIG.
Only the take-up side posts (7,8,10,12) are driven to the position shown in FIG. As described above, according to the present invention, since the magnetic tape 2 is not twisted during the loading process, the magnetic tape 2 can be run with a small winding angle of the magnetic tape 2 around the drum 1 during loading. Therefore, the traveling load applied to the magnetic tape 2 is reduced, which is advantageous for high-speed traveling. Further, all of the supply-side posts (5, 6, 9) in FIG. 8 are posts perpendicular to the reference plane 3f, and only the post 9 can be wound with the magnetic tape 2 substantially. Since the post 9 moves only in the plane, the backlash of the mechanism for driving the post 9 is reduced, and the guiding accuracy of the magnetic tape 2 can be easily ensured.

Further, a difference from the first embodiment shown in FIGS. 8 and 9 is that a supply side capstan 27 and a pinch roller 28 are added.

In the state shown in FIGS. 7, 8 and 9, the locus of scanning on the magnetic tape 2 by the magnetic head (not shown) mounted on the rotary drum 1a is shown in FIGS.
1, shown in FIG. The shaded areas in FIGS. 10, 11 and 12 indicate the scanning range of the magnetic head (not shown). As is apparent from the figure, the magnetic head rotates and scans at substantially the same angle as the track angle β1,2 recorded in the loading completed state of FIG. 2 in all the processes of winding the magnetic tape 2 around the drum 1. It is composed.

As shown in FIGS. 10, 11 and 12, the recording tracks 35, 35 ', 35 "on the magnetic tape 2 are divided into four tracks (subscript a,
b, c, d). Trucks 35a, 3
5b, 35c, 35d recording and reading order,
By the output from the mode selection means 22, the capstan 1
4 tape rotation direction and tape feed direction L
1, L2 can be selectively switched. Mode selection means 22
Thus, when the magnetic tape 2 is driven in the direction L1, 35a, 35a ', 35a ", ..., and when it is driven in the direction L2, 35b, 35b', 35b" ,.
.... 35c and 35 when driven in the direction L1 again
Recording / reading is sequentially performed in the order of c ′, 35c ″, .... The mode selection means 22 transmits a switching signal 22a according to an input signal from the outside and a tape end detection of the magnetic tape 2.

The tape running speeds of the magnetic tape 2 in the feeding directions L1 and L2 are fed equally. At this time, the number of rotations of the rotary drum 1a is equal to that of the tracks 35a, 35b, 35c, 3
It is controlled so that the magnitudes of the scanning vectors S1 and S2, which are the relative speeds of the 5d magnetic head and the magnetic tape 2, become equal.

FIG. 13 shows tape traveling speed vectors T1 and T2.
And a conceptual diagram of the peripheral velocity vectors H1 and H2 of the magnetic head due to the rotation of the rotary drum 1a. Subscript 1 is magnetic tape 2
Indicates that the drive is in the L1 direction, and the subscript 2 is L2.
Is being driven in the direction. The peripheral velocity vectors H1 and H2 are controlled by the number of revolutions of the rotary drum 1a so that the scanning vectors S1 and S2 formed by combining the tape velocity vectors T1 and T2 and the peripheral velocity vectors H1 and H2 are equal in size. Has been done. By this control, the relative speed between the magnetic head (not shown) and the magnetic tape 2 is always the same, and the recording / reproducing means 2 which is a signal processing circuit at the time of recording / reproducing.
1 is easily configured. Furthermore, the tape velocity vector T
By making 1 and T2 equal in size in opposite directions, the recording / reproducing time can be made the same regardless of the running direction of the magnetic tape 2, and the time management of the cassette 3 becomes easy.

The running direction of the magnetic tape 2 is L1 and L2.
, The track speeds β1 and β2 are slightly different, but the peripheral velocity vector H1,2 is several hundred times larger than the tape velocity vector T1,2, and the angle difference is very small.

Track 3 divided in the track longitudinal direction
Search information areas 36a, 36b, 36c, and 36d of 5a, 35b, 35c, and 35d are arranged in the vicinity of the facing portions of the divided tracks. By arranging the search information areas (36a, 36b, 36c, 36d) in this way, all four tracks 29a, 29b, 29c, in the state of FIG.
It is possible to read the search information of 29d without scanning all four tracks.

Further, in FIG. 14 showing the winding state of the magnetic tape 2 around another drum 1, the tracks 35a and 35b are wound at a winding angle around the drum 1 which is very small, about 20 degrees.
Both tracks can be searched.

In this way, the track 3 on the magnetic tape 2 is
When reading only part of 5, 35 ', 35''or writing only part of it, the winding angle of the magnetic tape 2 around the drum 1 required for the writing / reading area is set to
It has always realized a low-load tape running system.

In FIGS. 6 and 7, 27 is a supply side capstan, and 28 is a supply side pinch roller. In the state of FIG. 8, the magnetic tape 2 is driven by the capstan 14 and the pinch roller 13, and in FIG. 9, it is driven by the capstan 27 and the pinch roller 28. Further, the rotation of the capstan motor 14a is mediated by a belt 29 hung between a pulley 14b provided integrally with the capstan 14 and a pulley 27a provided integrally with the capstan 27,
The magnetic tape 2 is driven in the longitudinal direction to drive the motor 14a.
Can be used for both forward and reverse running, which is advantageous for downsizing and cost reduction.

Further, FIG. 15 shows another embodiment of the tape drive means. 30 is a tape drive motor, belt 3
The rotation of the motor 30 is controlled by the capstan 14,
It is transmitted to the supply side capstan 27. Also motor 3
The swinging idler 34 attached to 0 transmits rotation to the supply side reel stand 32 and the winding side reel stand 33 via the idler gears 32a and 33a depending on the rotation direction of the motor 30. The motor 30 can be configured in the plane of the tape, the size of the device can be reduced, and the tape tension of the magnetic tape 2 can be adjusted by controlling the rotation torque of the reel stands 32 and 33 during the loading / unloading process by the motor 30. Loading without damage is possible.

Further, since the magnetic tape 2 is not twisted during the whole winding process on the drum 1,
The motor 30 accelerates and decelerates the magnetic tape 2 during the tape loading operation. That is, when a fast-forward command is input from the tape pass state of FIG. 1, the tape pass state of FIG. 4 is entered. During this transition, the speed of the magnetic tape 2 is accelerated by driving the reel 32 or 33 via the swing idler 32a or 33a. Next, when a reproduction mode command is input, when the state of FIG. 4 is changed to the tape pass state of FIG. 1, the traveling speed of the magnetic tape 2 is changed to the reels 32, 33 via the motor 30 and the swinging idlers 32a, 33a. Is being loaded while decelerating the rotation speed of. Instead of the state of FIG. 4, FIG. 7 may be used, or FIGS. 8 and 9 may be used.

Further, during the loading operation, the information retrieval area 36 of the magnetic tape 2 may be retrieved while loading. In this embodiment, the drive arms 16, 1
Although the rotary shaft 20 of 7 rotates the drive arms 16 and 17 in a state of being coaxially positioned with the rotary shaft 1f of the rotary drum 1a, it does not have to be coaxially positioned. However, at this time, when the drive arms 16 and 17 are rotated, the drive arm 1
It is necessary to change the relative positions of the drum 1 and the posts 5 and 7 so that the rotation angle of the drums 6 and 17 and the winding angle of the magnetic tape 2 around the drum 1 become equal.

Further, in the embodiment, one motor (30, 14
Driven two capstans in a), but on the supply side,
A motor may be attached to both the capstan on the winding side, or the rotation may be transmitted from the motor driving the drum. Further, the roller posts 6 and 8 may be rollers without a flange or may be fixed posts.

[0039]

As described above, according to the magnetic recording / reproducing apparatus of the present invention, the following effects can be obtained. (1) By tilting the drum in the direction A by the lead angle, the posts (5 to 12) can be placed at the position corresponding to the winding angle of the magnetic tape around the drum without twisting the magnetic tape. It can be configured with various mechanisms. (2) By winding the magnetic tape around the drum at a smaller angle and running the magnetic tape, high-speed tape running becomes possible. (3) Since the magnetic tape is not wound around the first or second guide surface, the post on the supply side or the take-up side that is not wound can be configured by only the vertical post, and the accuracy of the post posture can be improved. It can be configured with a simpler mechanism. (4) By making the inclination direction A substantially parallel to the center line 3f of the reels 3a and 3b, the magnetic tape stretched over the entire surface of the cassette becomes parallel to the drum facing the magnetic tape, and the drum can be brought close to the magnetic tape. Can be realized. (5) By accelerating / decelerating the magnetic tape feed in the loading / unloading process, it is possible to shorten the magnetic tape search time. (6) Recording / reproduction in the forward and reverse directions facilitates long-time recording on the magnetic tape, and the relative speed between the magnetic tape and the magnetic head is always constant, thereby simplifying the recording / reproduction processing circuit. (7) By setting the feeding speeds of the magnetic tape in the forward and reverse directions at the time of recording / reproducing to be the same, it becomes easy to manage the recording / reproducing time of the magnetic tape. (8) By arranging the track information search areas at the opposing portions of the tracks, it is possible to scan a large amount of search information with a smaller winding angle of the magnetic tape around the drum. (9) By constantly scanning only a part of the magnetic tape, the tape running load can be suppressed and the magnetic tape can be searched at high speed. (10) While scanning only a part of the magnetic tape, the scanning area on the magnetic tape is wrapped around the drum by the post (5-1).
It can be changed by moving 2), and information can be recorded / reproduced on the entire surface of the magnetic tape with a small tape running load. (11) It is possible to configure the forward / backward feed of the magnetic tape with a small number of motors. (12) The motor can be freely arranged, the size of the device can be easily reduced, and the feeding speed and the tape tension of the magnetic tape during the loading / unloading process can be controlled by one motor.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of a magnetic recording / reproducing apparatus of the present invention.

FIG. 2 is a plan view of the same embodiment.

FIG. 3 is a front view of the embodiment.

FIG. 4 is a diagram showing a tape winding start state of the embodiment.

FIG. 5 is a plan view of the main part of the drive arm of the embodiment.

FIG. 6 is a front view of the main part of the drive arm of the embodiment.

FIG. 7 is a state diagram of the apparatus in the loading process of the embodiment.

FIG. 8 is a plan view of a second embodiment of the magnetic recording / reproducing apparatus of the present invention.

FIG. 9 is another mode state diagram of the embodiment.

10 is a diagram showing a head scanning locus in the state of FIG.

11 is a diagram showing a head scanning locus in the state of FIG.

FIG. 12 is a diagram showing a head scanning locus in the state of FIG. 9;

FIG. 13 is an explanatory diagram of scan vectors.

FIG. 14 is a diagram showing a head scanning locus in another state.

FIG. 15 is a plan view of the third embodiment of the magnetic recording / reproducing apparatus of the present invention.

FIG. 16 is an explanatory diagram of a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 1 drum 5,6,7,8 roller post 16,17 drive arm 14,27 capstan 29 belt 35 (a, b, c, d) split track 36 (a, b, c, d) search information area

Claims (12)

[Claims] 1. A tape guide drum having a rotating shaft for pulling out a magnetic tape from two reels wound in parallel with a first reference plane and wound in parallel with the first reference surface and rotatably supporting a magnetic head. A magnetic recording / reproducing apparatus for spirally winding a predetermined angle at a predetermined lead angle, wherein a first guide surface and a first guide surface which are formed on an outer peripheral surface of the drum and divide the magnetic tape winding angle around the drum into approximately two equal parts. 2 guideways,
A first post group that winds a magnetic tape around the first guide surface, and a second post group that winds a magnetic tape around the second guide surface, and the first and second post groups Each has at least one inclined post around which a magnetic tape is helically wound, the drum having the rotation axis with respect to a first reference plane and the first and second
The magnetic recording / reproducing apparatus is arranged so as to be inclined by the lead angle in a direction substantially perpendicular to a plane including an intersection with the guide surface. 2. A magnetic tape is wound around a drum over a degree A at a first position, and the magnetic tape is wound around the drum by B (B <B <
A) A first post group and a second post group that are wound around the second position for a number of times and are movable to a third position where the magnetic tape is not wound around the drum. The magnetic recording / reproducing apparatus according to claim 1, further comprising a driving unit that drives the first and second post groups. 3. The magnetic recording / reproducing apparatus according to claim 2, wherein the second position is a position where the magnetic tape is not wound around either the first guide surface or the second guide surface of the drum. 4. A magnetic recording / reproducing apparatus according to claim 3, wherein the direction of inclination of the drum is substantially parallel to the center line connecting the centers of the two reels. 5. A tape guide drum on which a magnetic head is mounted, and the magnetic tape is wound around the drum at a first position over A degrees, and the magnetic tape is wound on the drum B (B <A).
A first post group and a second post group which are wound around the second position over a period of time and are movable to a third position where the magnetic tape is not wound around the drum, and the first and second post groups. The first post group and the second post group have drive means for driving the second post group and tape speed acceleration / deceleration means for accelerating and decelerating the feeding speed of the magnetic tape in the longitudinal direction.
In the process in which the group of posts moves from the first position to the second position or from the second position to the first position, the tape accelerating / decelerating means accelerates or decelerates the magnetic tape feeding speed in the longitudinal direction. A magnetic recording / reproducing apparatus characterized by the above. 6. A tape guide drum having a magnetic head mounted thereon, and the magnetic tape is wound around the drum at a first position over A degrees, and the magnetic tape is wound around the drum B (B <A).
A first post group and a second post group which are wound around the second position over a period of time and are movable to a third position where the magnetic tape is not wound around the drum, and the first and second post groups. Driving means for driving the second post group, recording / reproducing means for performing recording or reproduction on or from the magnetic tape by the magnetic head at the first position and the second position, and a magnetic tape in the longitudinal direction. The tape drive means for driving the magnetic tape in the first direction, the first mode for driving the magnetic tape in the first direction by the drive means, and the second mode for driving the magnetic tape in the second direction opposite to the first direction. In the first mode, the peripheral velocity vector H1 of the magnetic head by the rotation of the rotary drum and the traveling velocity vector T1 of the magnetic tape by the driving unit are combined in the first mode. scanning The vector S1, peripheral velocity vector H of the magnetic head by the rotary drum in the second mode
2 and a second scanning vector S2, which is a combination of the traveling velocity vector T2 of the magnetic tape by the driving means,
The first scan vector S1 and the second scan vector S2
And the same size as the magnetic recording and reproducing device. 7. The magnetic recording / reproducing apparatus according to claim 6, wherein the tape velocity vector T1 and the tape velocity vector T2 have the same magnitude. 8. A tape guide drum having a magnetic head mounted thereon, and the magnetic tape is wound around the drum at a first position over A degrees, and the magnetic tape is wound around the drum at B (B <A).
A first post group and a second post group which are wound around the second position over a period of time and are movable to a third position where the magnetic tape is not wound around the drum, and the first and second post groups. Driving means for driving the second post group, tape driving means for driving the magnetic tape in the longitudinal direction, and magnetic recording / reproducing apparatus for recording an inclined track on the magnetic tape or reading a signal from the recorded inclined track. And the tilt track is n (n is 2) in the longitudinal direction of the tilt track.
The above positive integer) composed of n divided slant tracks, and the search information area of each of the divided n slant tracks is located in the vicinity of the facing portion of each of the divided n slant tracks. A magnetic recording / reproducing apparatus characterized by being arranged. 9. A tape guide drum on which a magnetic head is mounted, and the magnetic tape is wound around the drum at a first position over A degrees, and the magnetic tape is wound around the drum B (B <A).
A first post group and a second post group which are wound around the second position over a period of time and are movable to a third position where the magnetic tape is not wound around the drum, and the first and second post groups. Driving means for driving the second post group, tape driving means for driving the magnetic tape in the longitudinal direction, and inclined tracks recorded on the magnetic tape by the magnetic head are n in the longitudinal direction.
(N is a positive integer of 2 or more) divided into n slant track groups, and the post position is a slant track group in which the scanning area on the magnetic tape by the magnetic head mounted on the rotating drum is n. The magnetic recording / reproducing apparatus is characterized in that the winding position is always smaller than the area. 10. A magnetic recording / reproducing apparatus according to claim 9, wherein the post around which the magnetic tape is wound around the rotating drum is movable, and at least one of the n-divided inclined track groups is scanned by the movement of the post. 11. A drum for guiding a magnetic tape, a plurality of posts which move substantially right and left sides of the drum to wind the magnetic tape around the drum spirally, and a plurality of posts which move left and right sides of the drum. 2. The magnetic recording / reproducing apparatus according to claim 1, further comprising at least two capstans that drive the magnetic tape in the longitudinal direction, a motor, and a transmission unit that transmits the rotation from the motor to the capstan. 12. A magnetic recording / reproducing apparatus according to claim 11, further comprising two reel bases for supporting two reels around which a magnetic tape is wound, and a transmission means for transmitting rotation from a motor to the reel bases. .