JPH05198050A - Magnetic recording and reproduction device - Google Patents

Abstract

PURPOSE:To reduce the size by making a magnetic tape travel in contact with the outer peripheral surface of a rotary roller and then omitting a conventional capstan, a capstan driving means, and a pinch roller. CONSTITUTION:When the magnetic tape 1 travels through a reel, the tape contacts the outer peripheral surface of the rotary roller 35. The rotary roller 35 rotates so that the speed of the outer peripheral surface is as fast as the travel speed of the magnetic tape 1; and an FG signal generating means 53a contacts the rotary roller 35 and is transferred to the traveling magnetic tape 1. The FG signal generating means which is transferred to the magnetic tape 1 generates an FG signal corresponding to the travel speed of the magnetic tape 1 and the signal is detected by an FG signal detecting means 36.

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 using a magnetic tape as a recording medium.

[0002]

2. Description of the Related Art FIG. 7 is a perspective view showing a part of a conventional magnetic recording / reproducing apparatus disclosed in Japanese Patent Laid-Open No. 63-71963. In the figure, 1 is a magnetic tape, 13 is a pinch roller, 14 is a capstan, 21 is a take-up side reel, 22 is a supply side reel, and the magnetic tape 1 is wound around both reels. Reference numeral 26 is a capstan motor, 27 is a flywheel fixed coaxially with the capstan 14, and the peripheral portion is magnetized to generate an FG signal according to the number of revolutions. 28 is a belt for transmitting the driving force of the capstan to the flywheel 27.

Next, the operation will be described. In the magnetic recording / reproducing apparatus configured as described above, the magnetic tape 1 is pressed and pinched by the pinch roller 13 and the capstan 14 at the time of recording or reproducing. Capstan 14
Receives the rotational driving force from the capstan motor 26 via the belt 28 to the flywheel 27 and causes the magnetic tape 1 to run. At that time, the flywheel 27 generates an FG signal corresponding to the number of rotations. The running speed of the magnetic tape 1 is detected by detecting this FG signal by FG signal detecting means (not shown).

[0004]

In the conventional apparatus, the FG signal magnetized to the peripheral portion of the flywheel 27 is used as means for detecting the running speed of the magnetic tape 1. In order to detect the running speed of the magnetic tape with high accuracy, an FG of generally several hundred Hz to several kHz is used.
It is necessary to generate a signal, and in order to magnetize the FG signal corresponding to the signal to the outer peripheral portion of the flywheel 27,
Further, the flywheel 27 inevitably has a large diameter in order to obtain a sufficient driving force for driving the magnetic tape 1, which is not suitable for downsizing the entire apparatus. Further, in the conventional apparatus, when the magnetic tape 1 is driven during recording or reproduction, the magnetic tape 1 is held and pressure-bonded by the capstan 14 and the pinch roller 13.
In particular, when a thin magnetic tape is used, there is a problem that it may be damaged such as a part of it being stretched.

The present invention has been made to solve the above problems, and is a means for accurately detecting the running speed of a magnetic tape without using a conventional capstan or pinch roller when running the magnetic tape. An object of the present invention is to obtain a magnetic recording / reproducing device equipped with one suitable for downsizing.

[0006]

A magnetic recording / reproducing apparatus according to the present invention is an FG signal generating means using a magnetic material that outputs a signal according to the number of revolutions, and magnetizes or magnetizes a magnetic tape in contact with an outer peripheral surface. It comprises a rotating roller having a transferable FG signal generating means on its outer peripheral surface and a fixed FG signal detecting means.

Further, a rotating roller having an FG signal generating means using a magnetic material on the outer peripheral surface, and a transfer means for transferring the FG signal generating means of the rotating roller to a magnetic tape in contact with the outer peripheral surface of the rotating roller, And a fixed FG signal detecting means.

Further, with respect to a rotating roller having FG signal generating means using a magnetic material and capable of being magnetized or transferred to a magnetic tape in contact with the outer peripheral surface, both sides in the running direction of the magnetic tape. At least 1 each
The number of fixed FG signal detecting means is provided.

Further, a rotating roller having an FG signal generating means using a magnetic material, the FG signal generating means being capable of being magnetized or transferred to a magnetic tape in contact with the outer peripheral surface,
An FG signal detecting means and an erasing head are provided behind the FG signal detecting means with respect to the traveling direction of the magnetic tape.

Further, in the rotating roller having the FG signal generating means using a magnetic material and having the FG signal generating means which can be magnetized or transferred to the magnetic tape in contact with the outer peripheral surface, on the outer peripheral surface of the rotating roller. The FG signal generating means is provided so as to be provided in the height direction of the rotating roller over at least two stages by shifting the phase in the circumferential direction of the rotating roller, and the FG signal generating means included in the rotating roller is also provided. The fixed FG signal detecting means having the same number of detecting units is provided.

Further, a rotating roller having an FG signal generating means using a magnetic material and having an FG signal generating means on the outer peripheral surface capable of being magnetized or transferred to a magnetic tape in contact with the outer peripheral surface,
It comprises at least two or more detectors in the height direction and a fixed FG signal detector which is displaced in the running direction of the magnetic tape sliding on the detectors.

[0012]

In the magnetic recording / reproducing apparatus configured as described above, the magnetic tape is run so as to be in contact with the outer peripheral surface of the rotating roller, so that the magnetic tape is generated from the rotating roller by the FG signal generating means. Is constantly magnetized or transferred regardless of the traveling speed of. Next, FG
By detecting the FG signal of the magnetic tape running by the signal detecting means, the FG signal corresponding to the running speed of the magnetic tape can be detected, that is, the running speed of the magnetic tape can be detected.

Further, the magnetic tape is moved so as to be in contact with the outer peripheral surface of the rotating roller, and the FG signal generating means provided on the outer peripheral surface of the rotating roller is uniformly transferred by the transfer means regardless of the running speed of the magnetic tape.

Further, the FG signal detecting means provided on both sides of the rotating roller having the FG signal generating means in the running direction of the magnetic tape causes the magnetic tape to generate an FG signal corresponding to the running speed of the magnetic tape in the forward direction. The traveling speed of the magnetic tape can be detected by detecting the traveling speed of the magnetic tape when traveling in the reverse direction.

Further, the FG signal is detected by the FG signal generating means magnetized or transferred to the magnetic tape by the FG signal detecting means, and the magnetic tape is magnetized by the erasing head provided behind the FG signal detecting means. Alternatively, the transferred FG signal generating means is erased.

Further, the FG signal generating means provided in at least two stages or more by shifting the phase in the circumferential direction of the rotating roller is proportional to the number of stages of the FG signal generating means provided according to the traveling speed of the magnetic tape. Generate a frequency FG signal.

Further, the FG signal detecting means having at least two detectors detects the FG signal which is proportional to the running speed of the magnetic tape and is proportional to the number of detectors.

[0018]

【Example】

Example 1. FIG. 1 is a perspective view of a part of a magnetic recording / reproducing apparatus showing an embodiment of the present invention. 35 is a rotating roller,
It is provided at a position in contact with the outer peripheral surface of the magnetic tape 1 when the magnetic tape 1 travels. Reference numeral 35a is an FG signal generating means for outputting a signal according to the rotation speed of the rotating roller 35, and in this embodiment, the S pole and the N pole are alternately magnetized on the outer peripheral surface of the rotating roller 35 at predetermined intervals. An example using the thing is shown.
Reference numeral 36 denotes an FG signal detecting means, and in this embodiment, a fixed head is provided at a position where the magnetic tape 1 comes into contact with the running time.

In the magnetic recording / reproducing apparatus constructed as described above, when the magnetic tape 1 is run by the reel (not shown), it comes into contact with the outer peripheral surface of the rotating roller 35. The rotating roller 35 rotates at a speed such that the speed of the outer peripheral surface thereof becomes the same as the running speed of the magnetic tape 1, and the FG signal generating means 35 a is transferred to the magnetic tape 1 running in contact with the rotating roller 35. Next, the F transferred to the magnetic tape 1
An FG signal corresponding to the running speed of the magnetic tape 1 is generated by the G signal generating means and detected by the FG signal detecting means 36.

Example 2. In the first embodiment, as the FG signal generating means that generates a signal according to the rotation speed of the rotating roller and can be magnetized or transferred to the magnetic tape in contact with the outer peripheral surface,
Although an example in which the S pole and the N pole are alternately magnetized at predetermined intervals on the outer peripheral surface of the rotating roller is shown, this embodiment shows that the outer surface of the rotating roller made of a non-magnetic material is arranged at predetermined intervals. A minute magnet is provided in the circumferential direction. As a result, the same operation as that of the first embodiment can be expected.

Further, as long as the FG signal generating means is capable of generating a signal corresponding to the rotation speed of the rotating roller and magnetizing or transferring the magnetic tape in contact with the outer peripheral surface of the rotating roller, the same operation can be performed by any other means. As long as the FG signal detecting means can be expected, an equivalent operation can be expected even if a magnetic sensor or the like other than the fixed head is used as long as the FG signal can be detected.

Embodiment 3 FIG. 2 is a perspective view of a part of a magnetic recording / reproducing apparatus according to another embodiment of the present invention. Reference numeral 35 is a rotating roller, and 35a is an FG signal generating means, which is an example in which an S pole and an N pole are alternately magnetized at predetermined intervals on the outer peripheral surface of the rotating roller. Reference numeral 36 is an FG signal detecting means, and this embodiment shows an example using a fixed head. Three
Reference numeral 8 denotes a transfer means, and in this embodiment, a means for applying a magnetic field is used at a position where the magnetic tape 1 and the rotating roller are in contact with each other.

In the magnetic recording / reproducing apparatus configured as described above, the rotating roller 3 is used when the magnetic tape 1 travels.
The outer peripheral surface of the rotating roller 35 travels at the same speed as the magnetic tape 1 by contact with the magnetic tape 5. At that time, the rotating roller 35 is attached to the running magnetic tape 1 by the transfer means 38.
The FG signal generating means 35a provided on the outer peripheral surface of is transferred. In this embodiment, the FG of the magnetic tape 1 and the rotary roller 35 is used.
Transfer to the magnetic tape 1 is performed by applying a magnetic field to the portion in contact with the signal generating means 35a. Next, the transferred FG signal generating means generates an FG signal according to the running speed of the magnetic tape, and the FG signal detecting means by the fixed head detects the FG signal. This makes it possible to detect the traveling speed of the traveling magnetic tape 1.

Example 4. In the third embodiment, a means for applying a magnetic field has been shown as a transfer means for the FG signal, but in this embodiment, a transfer means by irradiating laser light to heat the magnetic tape to a temperature above the Curie point is presented. As a result, the same operation as that of the third embodiment can be expected. Furthermore, as long as the FG signal generating means can be transferred, the same operation can be expected with other means.

Example 5. FIG. 3 is a top view showing a part of a magnetic recording / reproducing apparatus according to another embodiment of the present invention. Reference numeral 35 is a rotary roller, and 36 is an FG signal detecting means provided on both sides of the rotary roller 35 in the running direction of the magnetic tape 1, and an example using a fixed head is shown.

In the magnetic recording / reproducing apparatus configured as described above, the rotating roller 3 is used when the magnetic tape 1 travels.
5, the FG signal generating means is magnetized or transferred, and the FG signal generated according to the running speed of the magnetic tape is detected by the FG signal detecting means 36-1 or 36 depending on the running direction.
-2 to detect.

Sixth Embodiment In the fifth embodiment, an example in which a fixed head is used as the FG signal detecting means is shown, but in the present embodiment, a magnetic sensor is used to expect the same operation. Further, as long as the FG signal detecting means is a means capable of detecting the FG signal generated by the FG signal generating means transferred to the magnetic tape 1, the same operation can be expected even if it is another means.

Embodiment 7 FIG. 4 is a top view showing a part of a magnetic recording / reproducing apparatus showing another embodiment of the present invention. Reference numeral 35 is a rotary roller having FG signal generating means (not shown), and 36 is an F by a fixed head.
A G signal detecting means, 37 is an erasing head, and is a rotating roller 35 and an FG signal detecting means 3 in the running direction of the magnetic tape.
It is provided at the rear of 6.

In the magnetic recording / reproducing apparatus configured as described above, the FG signal transferred onto the magnetic tape 1 is detected by the detecting means 36 after the FG signal transferred onto the magnetic tape 1 is detected by the detecting means 36. Erase.

Embodiment 8 FIG. 5 is a perspective view showing a part of a magnetic recording / reproducing apparatus according to another embodiment of the present invention. 35 is a rotating roller, 35a-3
Reference numeral 5c is an FG signal generating means provided on the outer peripheral surface of the rotating roller, and is provided in three stages by shifting the phase by 1/3 cycle in the circumferential direction of the rotating roller 35. Reference numeral 36 denotes an FG signal detecting means using a fixed head, and the detecting unit 36
The ac is provided in three steps in the height direction.

In the magnetic recording / reproducing apparatus configured as described above, the magnetic tape 1 travels while being in contact with the outer peripheral surface of the rotating roller 35. At this time, the FG signal generating means provided on the outer peripheral surface of the rotating roller 35 is magnetized or transferred to the magnetic tape. F as the magnetic tape 1 runs
The FG signal magnetized or transferred to the magnetic tape 1 is detected by the G signal detecting means. The detected FG signal is FG
It has a cycle three times the frequency when the signal generating means is used alone.

[Embodiment 9] In the above-mentioned Embodiment 8, an example in which the FG signal generating means is provided in three stages by shifting is shown, but if at least two or more stages are provided, an equivalent operation can be expected.

Embodiment 10 FIG. 6 is a perspective view of a part of a magnetic recording / reproducing apparatus according to another embodiment of the present invention. Reference numeral 35 is a rotating roller, 35a is an FG signal generating means, and 36 is an FG signal detecting means by a fixed head. The detecting portions 36a to 36c are provided with their phases shifted by 1/3 cycle.

In the magnetic recording / reproducing apparatus configured as described above, the FG signal generating means of the rotating roller 35 is transferred to the magnetic tape 1 as the magnetic tape runs, and the transferred FG signal generating means outputs the FG signal. An FG signal corresponding to the traveling speed of the magnetic tape 1 is detected by the detection means. At this time, F having a frequency three times higher than that of the case where the detection unit is independently provided by the detection unit whose phase is shifted by 1/3 cycle
The G signal is detected, and the running speed of the magnetic tape is detected.

[0035]

Since the present invention is constructed as described above, it has the following effects.

The conventional capstan, capstan drive means, and pinch roller can be omitted, which is suitable for downsizing.

Capstan, pressure bonding with pinch rollers,
The magnetic tape is not damaged because it is not pinched.

The FG signal generating means can be easily magnetized or transferred onto the magnetic tape.

The running speed of the magnetic tape can be detected not only in the forward direction but also in the reverse direction.

Not only can the running speed of the magnetic tape be easily detected, but the recorded video and audio signals are not affected.

Even if the frequency (density) of the FG signal included in the FG signal generating means is high, the running speed of the magnetic tape can be detected with high accuracy.

[Brief description of drawings]

FIG. 1 is a perspective view showing a part of a magnetic recording / reproducing apparatus according to the present invention.

FIG. 2 is a perspective view showing a part of a magnetic recording / reproducing apparatus according to the present invention.

FIG. 3 is a top view showing a part of a magnetic recording / reproducing apparatus according to the present invention.

FIG. 4 is a top view showing a part of a magnetic recording / reproducing apparatus according to the present invention.

FIG. 5 is a perspective view showing a part of a magnetic recording / reproducing apparatus according to the present invention.

FIG. 6 is a perspective view showing a part of a magnetic recording / reproducing apparatus according to the present invention.

FIG. 7 is a perspective view showing a part of a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 1 magnetic tape 6, 10 guide roller 7, 9 slant pin 8 rotating cylinder 13 pinch roller 14 capstan 26 capstan driving means 27 flywheel 28 belt 35 rotating roller 35a FG signal generating means 36 FG signal detecting means 38 transfer means

Claims (6)

[Claims] 1. A magnetic recording / reproducing apparatus for recording / reproducing signals such as audio and video using a magnetic tape as a recording medium,
A FG signal generating means using a magnetic material that outputs a signal according to the number of revolutions, which is fixed to a rotary roller having an FG signal generating means on its outer peripheral surface that can be magnetized or transferred to a magnetic tape in contact with the outer peripheral surface. And an FG signal detecting means,
The magnetic tape is run so as to be in contact with the outer peripheral surface of the rotating roller, and the FG signal generated by the FG signal generating means magnetized or transferred to the magnetic tape by the rotating roller is used by the FG signal detecting means. A magnetic recording / reproducing apparatus, wherein the traveling speed of the magnetic tape is detected by detecting. 2. A rotating roller having an FG signal generating means using a magnetic material on an outer peripheral surface thereof, and an F having the rotating roller.
2. The magnetic recording / reproducing apparatus according to claim 1, further comprising a transfer means for transferring the G signal generating means onto a magnetic tape in contact with the rotating roller, and an FG signal detecting means. 3. A running direction of the magnetic tape with respect to a rotating roller having FG signal generating means using a magnetic material, the FG signal generating means being capable of magnetizing or transferring to a magnetic tape in contact with the outer peripheral surface, on the outer peripheral surface. 3. The magnetic recording / reproducing apparatus according to claim 1, wherein at least one FG signal detecting means is provided on each side of the magnetic recording / reproducing apparatus. 4. An FG signal generating means using a magnetic material, the rotating roller having an FG signal generating means on an outer peripheral surface capable of being magnetized or transferred to a magnetic tape in contact with the outer peripheral surface, and an FG.
2. The magnetic recording / reproducing apparatus according to claim 1, further comprising a signal detecting means and an erasing head behind the FG signal detecting means by the fixed head with respect to the running direction of the magnetic tape. 5. An FG signal generating means made of a magnetic material, which can be magnetized or transferred to a magnetic tape in contact with an outer peripheral surface.
In the rotating roller having the G signal generating means on the outer peripheral surface,
The FG signal generating means provided on the outer peripheral portion of the rotating roller is shifted in phase in the circumferential direction of the rotating roller by at least 2.
A rotary roller configured to be provided in the height direction of the rotary roller over a step or more, an FG signal transfer means, and an FG signal detection means having the same number of detection units as the FG signal generation means provided in the rotary roller. The magnetic recording / reproducing apparatus according to claim 1, further comprising: 6. A rotary roller having FG signal generating means using a magnetic material and having FG signal generating means on the outer peripheral surface capable of being magnetized or transferred to a magnetic tape in contact with the outer peripheral surface, and at least two or more detecting portions. 2. The magnetic recording / reproducing apparatus according to claim 1, further comprising FG signal detecting means having the height direction in the height direction and being displaced in the longitudinal direction of the magnetic tape which slides the detecting portions.