JP2803079B2 - Magnetic recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape which is spirally wound around a cylindrical cylinder at a predetermined lead angle at a predetermined lead angle, and attached around a rotating body arranged concentrically with the cylinder. VT for recording / reproducing signals to / from the magnetic tape with a magnetic head
It relates to a magnetic recording / reproducing device such as R. 2. Description of the Related Art In recent years, there has been an increasing demand for multifunctional and high-performance magnetic recording / reproducing apparatuses such as VTRs for recording / reproducing video signals. In particular, there is a strong demand for editing, read-after-write, and Hi-Fi recording functions.
For this reason, magnetic recording / reproducing apparatuses provided with a large number of magnetic heads are becoming popular. However, in the conventional magnetic recording / reproducing apparatus, an impact error is likely to occur because the magnetic head protrudes from the cylinder, and an extremely large problem occurs because the number of magnetic heads increases. Hereinafter, an example of the above-described conventional magnetic recording / reproducing apparatus will be described with reference to the drawings. FIG. 5 is a plan view showing the overall configuration of the magnetic recording / reproducing apparatus. The magnetic tape 1 is paid out from the supply reel 2, wound around a cylindrical cylinder 3 by a predetermined angle, stably driven by a capstan 4 and a pinch roller 5, and wound on a take-up reel 6. Sliding member 7a in which guide posts 8a, 9a are implanted and guide post 8b,
The sliding member 7b with the implanted 9b is the opening of the tape cassette 13.
A first position (indicated by a dotted line in the figure) at which the magnetic tape 1 can be pulled out of the tape cassette 13 at 13a, 13b;
The magnetic tape 1 is pulled out and reciprocated between a second position (shown by a solid line in the figure) where the magnetic tape 1 is wound around the cylinder 3.
When signal recording / reproduction is not performed, the sliding members 7a and 7b are at the first position, and the tape cassette 13 can be attached and detached. When recording / reproducing a signal, the sliding members 7a and 7b move to the second position, and the magnetic tape 1 is pulled out of the tape cassette 13 and wound around the cylinder 3 by a predetermined angle. 5, the magnetic tape 1 is driven in the direction shown in FIG. At this time, the magnetic heads 10a, 10b, 11a, 1 attached around the cylinder 3
The signals 1b, 12a, and 12b are rotated in the direction shown in FIG. Where the magnetic head 10
Reference numerals a and 10b denote erasing heads for erasing previously recorded signals prior to signal recording, magnetic heads 11a and 11b are recording / reproducing heads used for normal recording / reproduction, and 12a and 12b are recording / reproducing heads.
This is a monitor head for simultaneously reproducing signals recorded by the reproduction heads 11a and 11b. That is, when a signal is recorded on the magnetic tape 1, first, the erase head 10
The previously recorded signals are erased by a and 10b, then the signals are recorded by the recording / reproducing heads 11a and 11b, and simultaneously reproduced by the monitor heads 12a and 12b. When the signal once recorded is reproduced later, the recording / reproducing heads 11a and 11b perform this. In order to record and reproduce a practically sufficient signal on the magnetic tape 1 on the magnetic tape 1, the magnetic heads 10a, 10b, 11
a, 11b, 12a, and 12b need to rotate while being sufficiently close to the magnetic tape 1. For this purpose, the magnetic heads 10a, 10b, 11
The a, 11b, 12a, and 12b are mounted on the cylinder 3 such that their tips project outward from the outer peripheral surface of the cylinder 3 by several tens of μm. Therefore, in the portion of the magnetic tape 1 wound around the cylinder 3, the magnetic heads 10a, 10b, 11a, 11b, 12
As shown in FIG. 5, a and 12b are in contact with the magnetic tape 1 while locally deforming it into a mountain shape. However, the magnetic tape 1 receives tension in its running direction and has an apparently high rigidity because it is bent in an arc shape along the cylinder 3, so that the mountain-shaped deformation of the magnetic tape 1 in this portion is quickly recovered. However, the magnetic tape 1 does not vibrate. However, as described above, the magnetic heads 10a, 10b, 11a, 11
Because b, 12a, 12b protrude from cylinder 3,
Compared to the position where the magnetic tape 1 is separated from the cylinder 3,
From the magnetic tape 1 to the magnetic heads 10a, 10b, 11a, 11b, 12
The positions at which a and 12b are separated are the magnetic heads 10a, 10b, 11a and 11
It is forward with respect to the rotation direction of b, 12a, 12b. That is, the magnetic heads 10a, 10b, 11a, 11b, 12a, and 12b continue to contact the portion of the magnetic tape 1 that is linearly stretched between the cylinder 3 and the guide post 9b, and then separate from the magnetic tape 1. Becomes Since the magnetic tape 1 in this portion is not bent in an arc shape, the deformation does not recover quickly and vibrates in the lateral direction, so that a so-called impact error occurs. As means for controlling such an impact error, as disclosed in Japanese Patent Publication No. 55900/1985, the width of the portion of the magnetic tape 1 linearly stretched between the cylinder 3 and the guide post 9b is known. A method is known in which a part of the inside is pressed to increase the tension of this part, and the vibration is rapidly attenuated. Problems to be Solved by the Invention According to this known method, a part of the width of the portion of the magnetic tape 1 stretched linearly between the cylinder 3 and the guide post 9b must be pressed. In addition, it is desirable to press the magnetic heads 10a, 10b, 11a, 11b, 12a, and 12b in a direction opposite to the pressing force to increase the tension at these portions. Therefore, pressing means for pressing the magnetic tape 1 must be fixedly arranged inside the running path of the magnetic tape 1 shown by the solid line in FIG. However, in the magnetic recording / reproducing apparatus of the related art in which the sliding members 7a and 7b reciprocate between the first position and the second position, the magnetic tape 1 is located inside the running path of the magnetic tape 1. When the means for pressing is fixedly arranged, the movement of the magnetic tape 1 during the loading operation is hindered, and it has been difficult to apply a conventionally known method. In view of the above problems, the present invention has a simple structure and does not hinder the movement of the magnetic tape 1 during a loading operation.
And presses the magnetic tape 1 from the inside of the traveling path of the magnetic tape 1 to quickly attenuate the vibration of the magnetic tape 1 and to provide a magnetic recording / reproducing apparatus with less impact error. Means for Solving the Problems To solve the above problems, the magnetic recording / reproducing apparatus of the present invention provides a magnetic tape at a position near a position where a magnetic head is separated from a magnetic tape and at a position where the magnetic tape is not in contact with a cylinder. Pressing means for pressing a portion within the width of
When the magnetic tape is pulled out of the tape cassette, the magnetic tape does not come into contact with the pressing means, and the pressing means drives the pressing means to press the magnetic tape when the magnetic head records / reproduces signals on the magnetic tape. And driving means for performing the operation. Operation The operation of the above configuration of the present invention is as follows.
That is, at the time of the loading operation in which the magnetic tape is drawn from the tape cassette and wound around the cylinder, the pressing means does not hinder the movement of the magnetic tape during the loading operation because the pressing means does not contact the magnetic tape. In addition, when the magnetic head performs signal recording / reproducing on the magnetic tape, the magnetic head is positioned close to the position where the magnetic head is separated from the magnetic tape and within the width of the magnetic tape at a position where the magnetic tape is not in contact with the cylinder. The pressing means presses a part. Then, the tension of this portion is increased by this pressing, and the vibration of the magnetic tape is rapidly attenuated to prevent an impact error. Embodiment Hereinafter, a magnetic recording and reproducing apparatus according to a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view schematically showing a magnetic recording / reproducing apparatus according to the present invention, and FIG. 2 is a perspective view of a sliding member 7b of the embodiment as viewed from obliquely above. Parts corresponding to those of the conventional example will be described with the same reference numerals. The sliding member 7a in which the guide posts 8a and 9a are implanted and the sliding member 7b in which the guide posts 8b and 9b are implanted draw the magnetic tape 1 out of the tape cassette 13 through the openings 13a and 13b of the tape cassette 13. The magnetic tape 1 reciprocates between a first position (shown by a dotted line in the figure) and a second position (shown by a solid line in the figure) where the magnetic tape 1 is pulled out and wound around the cylinder 3. Sliding member 7b
Is a pressing post 14 for pressing a part of the width of the magnetic tape 1.
It has. As shown in FIG. 2, only a part of the upper part of the pressing post 14 has a large outer diameter, and the pressing post 14 has such a structure that it contacts the magnetic tape 1 only at this part. When signal recording / reproduction is not performed, the sliding member 7a,
7b is in the first position, the pressing post 14 does not contact the magnetic tape 1, and the tape cassette 13 can be attached and detached.
When recording / reproducing a signal, the sliding members 7a, 7b
Moves to the second position, pulls out the magnetic tape 1 from the tape cassette 13 and winds it around the cylinder 3 by a predetermined angle,
The magnetic tape 1 is driven by the capstan 4 and the pinch roller 5 in the direction shown in FIG. The pressing post 14 implanted in the sliding member 7b moves together with the sliding member 7b. However, since the pressing post 14 is located behind the guide posts 8b and 9b, the pressing post 14 does not come into contact with the magnetic tape 1 and moves the magnetic tape 1. Do not hinder.
Then, when reaching the second position, a part of the width of the magnetic tape 1 stretched between the cylinder 3 and the guide post is pressed. Here, the magnetic heads 10a, 10b, 11a, 11b, 12a, and 12b mounted around the cylinder 3 are shown in FIG.
The signal is recorded / reproduced by rotating in the direction. Since the magnetic heads 10a, 10b, 11a, 11b, 12a, 12b protrude from the cylinder 3, the magnetic heads 10a, 1b
0b, 11a, 11b, 12a and 12b are cylinders 3 of the magnetic tape 1
After the contact is continued up to the portion stretched linearly between the magnetic tape 1 and the guide post 9b, the guide post 9b is separated from the magnetic tape 1. However, since the pressing post 14 presses a part of this part in the width of the magnetic tape 1 as shown in FIG. 1, the tension of this part rises and the vibration of the magnetic tape 1 is quickly attenuated. Recording / reproduction of a signal having a small impact error can be performed. The position of the pressing post 14 is preferably closer to the position where the magnetic heads 10a, 10b, 11a, 11b, 12a, and 12b are separated from the magnetic tape 1. that is,
This is because the shorter the span of this portion of the magnetic tape 1 (the span between the cylinder 3 and the pressing post 14), the higher the tension, the higher the natural frequency of the magnetic tape, and the more effectively the vibration is prevented. Therefore, the longer the distance L between the guide post 9b and the pressing post 14 shown in FIG. 1, the better. However, care must be taken because if L is too long, the pressing post 14 will collide with the tape cassette 13 at the first position. As described above, according to this embodiment, the pressing post 14 is located near the position where the magnetic heads 10a, 10b, 11a, 11b, 12a, and 12b are away from the magnetic tape 1 and the magnetic tape 1 is
Since a part of the width of the magnetic tape 1 at a position where the magnetic tape 1 is not in contact is pressed, the tension of this part is increased and the impact error can be reduced. Further, since the pressing post 14 is implanted in the sliding member 7b, the magnetic tape 1 does not contact the pressing post 14 during the loading operation, and the movement of the magnetic tape 1 is not hindered. In addition, the magnetic tape 1 can be pressed from inside the running path of the magnetic tape 1 during recording / reproducing of a signal. Hereinafter, a magnetic recording / reproducing apparatus according to a second embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a plan view schematically showing a magnetic recording / reproducing apparatus according to the present invention, and FIG. 4 is a perspective view of the sliding member 7b of the embodiment as viewed obliquely from above. In this embodiment, the pressing post
Numeral 14 is implanted in an arm 16 rotatably supported by a pivot shaft 15 implanted in the sliding member 7b. Arm 16 is sliding member 7b
Tension spring 18 stretched between a pin 17 and an arm 16 implanted in
Counterclockwise by the stopper 19
Does not rotate counterclockwise from the position shown in FIG. When signal recording / reproduction is not performed, the sliding members 7a and 7b are at the fixed positions. At this time, as shown in FIG. 3, the arm 16 comes into contact with the positioning pin 20, the arm 16 rotates clockwise, and the pressing post 14 fits inside the opening 13b without colliding with the tape cassette 13. The pressing post 14 does not contact the magnetic tape 1. Next, when recording / reproducing a signal, the sliding member 7 is used.
a and 7b are moved to the second position, and the magnetic tape 1 is pulled out of the tape cassette 13 and wound around the cylinder 3 by a predetermined angle. Arm 16 rotates counterclockwise to a position where it comes into contact with the stopper 19. Therefore, while the sliding member 7b is moving from the first position to the second position, the pressing post 14 moves away from the cylinder 3, so that the pressing post 14 moves to the cylinder 3 during the movement of the sliding member 7b. The pressing post 14 does not collide, and the pressing post 14 does not contact the magnetic tape. When the sliding member 7b reaches the second position, the arm 16
Abuts on the positioning pin 21 and rotates clockwise, and the pressing post 14 presses a part of the width of the magnetic tape 1 stretched between the cylinder 3 and the guide post as shown in FIG. Since the magnetic heads 10a, 10b, 11a, 11b, 12a, 12b protrude from the cylinder 3, the magnetic heads 10a, 10b,
11a, 11b, 12a and 12b are separated from the magnetic tape 1 after continuing to contact the portion of the magnetic tape 1 which is stretched linearly between the cylinder 3 and the guide post 9b. However, the pressing post 14 is particularly suitable for the magnetic heads 10a, 10b, 11
Since a, 11b, 12a, and 12b press a part of the width of the magnetic tape 1 at a position very close to the position away from the magnetic tape 1, the vibration of the magnetic tape 1 is rapidly attenuated, resulting in an impact error. Recording of signals with extremely low
Reproduction becomes possible. As described above, according to the present embodiment, since the pressing post 14 is implanted on the rotatably supported arm 16 and is positioned at the first position by the positioning pin 20, the pressing post 14 is pressed against the tape cassette 13. Post 14 does not collide with opening
The pressing post 14 does not come into contact with the magnetic tape 1 because the pressing post 14 fits inside the magnetic tape 1. While the sliding member 7b moves from the first position to the second position, the arm 16 is rotated counterclockwise by the tension spring 18, so that the pressing post
The pressing post 14 and the magnetic tape 1 do not collide with each other.
There is no contact. Further, since the arm 16 is positioned by the positioning pin 21 at the second position, the magnetic tape 1 is positioned very close to the position where the magnetic heads 10a, 10b, 11a, 11b, 12a, and 12b are separated from the magnetic tape 1.
Can be pressed in a part of the width, and the impact error can be drastically reduced. In both the first embodiment and the second embodiment, the shape of the pressing post 14 is such that only a part of the upper portion has a large outer diameter, but the shape of the pressing post 14 is not limited thereto. It is only necessary that a part thereof has a shape capable of pressing the magnetic tape 1. Effect of the Invention As described above, according to the present invention, the tension of the magnetic tape at the portion pressed by the pressing means increases, the vibration of the magnetic tape generated when the magnetic head separates from the magnetic tape can be suppressed, and the impact error can be reduced. . In addition, during the loading operation in which the magnetic tape is drawn from the tape cassette and wound around the cylinder, the magnetic tape does not contact the pressing means, so that the pressing means does not hinder the movement of the magnetic tape during the loading operation. Further, when the magnetic head records / reproduces signals to / from the magnetic tape, the magnetic head is located very close to the position away from the magnetic tape,
Since the pressing means presses the magnetic tape, the span between the cylinder and the pressing means can be shortened, and the natural frequency of the magnetic tape increases in conjunction with the increase in the tension, thereby effectively preventing the vibration of the magnetic tape. Errors can be drastically reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a magnetic recording / reproducing apparatus according to a first embodiment of the present invention, FIG. 2 is a perspective view of the sliding member of the embodiment viewed obliquely from above, FIG. FIG. 4 is a plan view of a magnetic recording / reproducing apparatus according to a second embodiment of the present invention, FIG. 4 is a perspective view of the sliding member of the embodiment viewed obliquely from above, and FIG. It is a top view. 1 ... magnetic tape, 2 ... supply reel, 3 ... cylinder, 6 ... take-up reel, 7a, 7b ... sliding member, 8a, 9a, 8b,
9b …… Guide post, 10a, 10b …… Erase head, 11a, 11b
…… Record / playback head, 12a, 12b …… Monitor head, 1
3 ... Tape cassette, 14 ... Pressing post, 15 ... Rotating shaft, 16 ... Arm, 17 ... Pin, 18 ... Tension spring, 19 ...
… Stoppers, 20, 21 …… Positioning pins.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G11B 15/61 G11B 15/665

Claims (1)

(57) [Claims] The magnetic tape is pulled out from a tape cassette containing a reel around which a magnetic tape is wound, wound around a cylindrical cylinder, and signals are recorded / reproduced on / from the magnetic tape by a magnetic head mounted around the cylinder. Pressing means for pressing a part of the width of the magnetic tape in a position near the position where the magnetic head separates from the magnetic tape and at a position where the magnetic tape is not in contact with the cylinder; and The magnetic tape does not come into contact with the pressing means when the magnetic tape is pulled out from the tape cassette, and the pressing means presses the magnetic tape when the magnetic head performs recording / reproducing of a signal with respect to the magnetic tape. A magnetic recording / reproducing apparatus comprising: driving means for driving the pressing means. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the drive means includes a tape drawing means for drawing a magnetic tape from a tape cassette and winding the magnetic tape around a cylinder.