JPH10143951A - Magnetic recording and reproducing device provided with tape damping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a noise by providing a damping device between a rotary cylinder and a tilt post in a magnetic recording and reproducing device in which a magnetic head scans helically. SOLUTION: A magnetic tape 13 wound on a magnetic tape supply reel 3 is twisted by two tilt posts 9A, 9B of an inlet side and an outlet side, wound on a rotary drum 2, and wound up a winding reel 4. Damping devices 1 are provided between the tilt post 9A of an inlet side and an inrush point 17 and between the tilt post 9B of an outlet side and a head separation point 18. The damping device 1 is constituted with a rotary roller contacting with the magnetic tape 13 and a rotary roller holding part, and the rotary roller is constituted with a nonwoven fabric made of nylon fiber and a rotary tool. And a noise of high frequency caused by vibration of the magnetic tape is reduced by contacting the rotary roller with only one part of the upper end part from the center in the direction of width in the magnetic tape 13 between the inlet side tilt post 9A and the outlet tilt post 9B.

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 having a rotary magnetic head for recording audio and video, and a vibration damper for removing noise generated by a relative motion between the magnetic head and the tape. The present invention relates to a magnetic recording / reproducing device provided with the device.

[0002]

2. Description of the Related Art As a device for recording audio and video, a video tape recorder (V-recorder) using a rotary magnetic head is used.
TR) and digital audio tape (DAT) are widely used. In these magnetic recording / reproducing devices, noise due to the collision or detachment of the magnetic head and the tape,
There was a problem that sound was collected from a voice microphone and recorded as noise. In particular, due to recent miniaturization of equipment and improvement in SN ratio, minute noise and high-frequency noise have hindered improvement in performance of equipment.

In order to prevent these noises, a protrusion is provided at a tape entry portion or a tape release portion of a fixed drum, so that vibration in the thickness direction of the tape is reduced and noise is also reduced (for example, see Japanese Unexamined Patent Publication No. -154346).

FIG. 12 is a block diagram of a video camera which is a conventional magnetic recording / reproducing apparatus for recording audio and video. This magnetic recording / reproducing apparatus is composed of a tape running system section 61, an audio microphone input section 62, and a video camera input section 63. Here, reference numeral 2 denotes a rotating drum, 3 denotes a magnetic tape supply reel, 4 denotes a take-up reel, 5 denotes a guide post, 6 denotes a tension regulator, 7 denotes a rotary post, and
8 is an erasing head, 9 is an inclined post, 10 is a voice control head, 11 is a capstan, 12 is a pinch roller, 13
Is a magnetic tape, and 14 is a rotary magnetic head.

In this configuration, the magnetic tape 13 wound on the magnetic tape supply reel 3 travels by a retracting operation by the pinch roller 12 and the capstan 11, and is mounted on the rotary drum 2 by being guided by the inclined post 9. Magnetic head
Pressed against 14, pinch roller 12 and capstan 11
And is taken up by the take-up reel 4.

[0006]

However, as the rotary drum 2 becomes smaller and rotates at a higher speed, not only the collision and detachment of the rotary magnetic head but also the suction of the magnetic tape at the head mounting window, which will be described later. The slight deformation of the magnetic tape propagates as a wave in the magnetic tape, and the high frequency noise generated by the vibration of the magnetic tape is prevented. Low-frequency vibration noise is suppressed,
High frequency vibrations are not suppressed. Therefore, there is a problem that high-frequency noise of 1 kHz or more is not reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a magnetic recording / reproducing apparatus having a vibration damping device for suppressing vibration of a magnetic tape and having reduced noise.

[0008]

In order to achieve this object, a magnetic recording apparatus according to the present invention suppresses the vibration of a magnetic tape between a rotary cylinder and an inclined post in a magnetic recording / reproducing apparatus in which a magnetic head performs helical scanning. The noise is reduced by contacting the post to be made with the magnetic tape.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS.

(Embodiment 1) FIG. 1 is a perspective view of a main part showing a configuration of a magnetic recording / reproducing apparatus provided with a tape damping device according to a first embodiment of the present invention.
The running system of R is shown. In FIG. 1, 1 is a vibration damping device, 2 is a rotating drum, 3 is a magnetic tape supply reel, 4 is a take-up reel, 5 is a guide post, 6 is a tension regulator, 7 is a rotating post, 8 is an erasing head, and 9A.
Is the entry side inclined post, 9B is the exit side inclined post, 10 is the voice control head, 11 is the capstan, 12 is the pinch roller, 13 is the magnetic tape, 14 is the rotary magnetic head, 15 is the head mounting window, 16 is The operation direction of the vibration damping device, 17 is a head entry point, and 18 is a head separation point.

In the construction of this apparatus, the magnetic tape 13 wound on the magnetic tape supply reel 3 is twisted by the two inclined posts 9A and 9B on the entrance side and the exit side, and is wound around the rotary drum 2 to take up the take-up reel. 4 The vibration damping device 1 of the present embodiment is provided between at least one of the entrance-side inclined post 9A and the head entry point 17 or between the exit-side inclined post 9B and the head separation point 18.

FIG. 2 is a perspective view showing the structure of the vibration damping device 1 of FIG. 1. In FIG. 2, reference numeral 21 denotes a rotating roller, 22 denotes a nonwoven fabric, 23 denotes a rotating tool, and 24 denotes a rotating roller support. This vibration damping device includes a rotating roller 21 that contacts the magnetic tape 13 and a rotating roller support 24. The rotating roller 21 includes a nonwoven fabric 22 and a rotating tool 23. Non-woven fabric 22,
For example, it is a nonwoven fabric on a sheet made of nylon fiber and having a total thickness of 180 μm. The rotating roller 21 is rotatably supported by a rotating roller supporting portion 24 on a central axis of a rotating tool 23 made of, for example, plastic, and the vibration damping device 1 shown in FIG.
By moving in the operating direction 16 of the magnetic tape 13, the magnetic tape 13 is in contact with or not in contact with the magnetic tape 13.

The magnetic tape 13 has a head release point 18 shown in FIG.
At the projection of the rotary magnetic head 14 and the head mounting window
Vibration is given by the negative pressure of 15, and the vibration oscillates toward the entry-side inclined post 9A. For example, in the case of the VHS method, in addition to the tapping sound of the rotary magnetic head 14 at a rotation cycle of 1800 rpm and 30 Hz and its harmonics, vibration of 1 to 10 kHz and 20 to 40 k
Oscillation of harmonics of Hz occurs.

FIG. 3 shows an example in which the state of vibration of the magnetic tape 13 is measured by an optical micrometer. The horizontal axis is the running direction of the magnetic tape 13, the oblique axis is the width direction of the magnetic tape, and the vertical axis is the thickness direction of the magnetic tape. The measurement location is between the head separation point 18 and the exit-side inclined post 9B shown in FIG. 1, and it can be seen that the vibration wave is traveling at the upper end of the magnetic tape. Performing a fast Fourier transform analysis of this vibration wave, there are components of 1 to 10 kHz and 20 to 40 kHz other than the 30 Hz head tapping sound,
It can be seen that when the vibration of the magnetic tape propagates in the air or the chassis and enters the microphone at the time of recording, the vibration is recorded as noise and the sound quality is deteriorated.

In order to eliminate the vibration, the vibration damping device 1 of the present embodiment is brought into contact with the magnetic tape 13 between the head separation point 18 and the outlet-side inclined post 9B. Thereby, harmonics of 1 to 10 kHz are reduced by 10 dB or more. At the same time, since the nonwoven fabric contacts the back surface of the magnetic tape, the vibration damping device of the present embodiment also has an effect of removing dirt on the back surface of the magnetic tape and reducing drip out.

In this embodiment, an example in which nylon fibers are used as the material of the nonwoven fabric has been described. May be used alone or in combination of two or more. Alternatively, the nonwoven fabric may be made into a plate by performing processing such as carding, needle punching and pressing, and may be punched into a cylindrical shape by a Thomson cutter or the like. Moreover, you may laminate | stack and use the thin sheet-shaped nonwoven fabric. further,
In order to increase the contact surface area, the nonwoven fabric sheets may be arranged in a water wheel shape as shown in the perspective view of FIG. In FIG. 4, 121 is a rotating roller, 122 is a nonwoven fabric, 23 is a rotating tool, 24
Indicates a rotating roller support.

Although the rotary roller type vibration damping device has been described, a fixed post type vibration damping device may be used.

Although the mechanism for contacting the back surface of the magnetic tape has been described, a mechanism for contacting the surface of the magnetic tape may be used.

When the vibration damping device is applied to the magnetic tape, the running load increases. As a result, the drive current increases, and a load is applied to the magnetic tape, thereby deteriorating the durability of the magnetic tape.

It is effective to operate the vibration damping device 1 when recording sound on a magnetic tape. FIG. 5 is a mechanism diagram for bringing the vibration damping device into contact with the magnetic tape only when recording the sound on the magnetic tape. Reference numeral 41 denotes a sound input unit using a microphone, and reference numeral 42 denotes a recording amplifier. This is because the sound from the sound input unit 41 is amplified to an appropriate volume by the recording amplifier 42, and when the recording mode is set (YES), the rotating roller support unit 24 operates and operates in the operation direction 16 of the vibration damping device. . Therefore, the running load can be reduced by bringing the vibration damping device 1 into contact with the magnetic tape 13 during voice recording and separating the vibration damping device 1 from the magnetic tape at other times.

FIG. 6 shows an example in which the contact portion between the magnetic tape 13 and the vibration damping device 1 is reduced in the vibration damping device 1 provided on the exit side of the rotary drum 2. The width 52 of the contact portion of the vibration damping device 1 is smaller than the width 53 of the magnetic tape 13, and is preferably 以下 or less. As shown in the vibration measurement example in FIG. 3, the vibration of the magnetic tape is generated at the upper end of the magnetic tape on the exit side of the rotary drum 2, so it is effective to provide a vibration damping device only at the upper end of the magnetic tape. Do not increase the running tension of the tape.

When the vibration damping device 1 is provided between the entry-side inclined post 9A and the head entry point 17, it is effective to contact the magnetic tape from the center to the lower end.

(Embodiment 2) FIG. 7 is a perspective view showing a main part of a magnetic recording / reproducing apparatus having a tape damping apparatus according to Embodiment 2 of the present invention.
The running system of R is shown. In FIG. 7, reference numeral 71 denotes a vibration damping device. The vibration damping device 71 of the present embodiment is provided between at least one of the inclined post 9A on the entry side and the head entry point 17 or at least one between the inclined post 9B on the exit side and the head separation point 18.

FIG. 8 is a perspective view showing the structure of the vibration damping device 71 of FIG. 7. In FIG. 8, reference numeral 81 denotes a metal outer peripheral portion, 82 denotes a resin,
23 is a rotating tool, and 24 is a rotating roller support. The metal outer peripheral portion 81 and the resin 82 are bonded. The rotating roller 21 is rotatably supported on a central axis of a rotating tool 23 made of, for example, a plastic by a rotating roller supporting portion 24.
Is moved in the operating direction 16 of the vibration damping device 71, thereby making contact with or not in contact with the magnetic tape 13.

According to the present embodiment, when the vibration damping device 71 comes into contact with the magnetic tape 13, the vibration of the magnetic tape is reduced.
The absorption by the 71 can suppress the vibration of the magnetic tape 13 at a high frequency of 20 kHz to 40 kHz by 20 dB.

The rotary roller type vibration damping device has been described above, but a fixed post type vibration damping device may be used. Further, the structure in which the metal outer peripheral portion 81 and the resin 82 are bonded has been described. However, the same effect can be obtained by using a structure in which two or more metal plates are bonded to each other with a resin to form a cylindrical shape and using the same as a vibration damping device.

It is effective to operate the vibration damping device 71 when recording sound on a magnetic tape. FIG. 9 is a mechanism diagram for bringing the vibration damping device into contact with the magnetic tape only when recording the sound on the magnetic tape. Reference numeral 41 denotes an audio input unit using a microphone, and reference numeral 42 denotes a recording amplifier. This is because the vibration damping device 71 is attached to the magnetic tape at the time of voice recording in the same manner as described with reference to FIG.
By bringing the magnetic tape into contact with the magnetic tape 13 and separating the magnetic tape from the magnetic tape at other times, the running load can be reduced.

FIG. 10 shows a magnetic damper 71 provided on the exit side of the rotary drum 2 and a magnetic tape 13 and a metal outer peripheral portion of the damper 71.
This is an example in which the contact portion 81 (adhered to the outer peripheral portion of the resin 82) is made small. The width 102 of the contact portion of the vibration damping device 71 is smaller than the width 103 of the magnetic tape 13, and is preferably 1/2 or less. FIG.
As shown in the measurement example of the vibration of the magnetic tape, the vibration of the magnetic tape is generated at the upper end of the magnetic tape on the exit side of the rotary drum 2, so that it is effective to provide a vibration damping device only at the upper end of the magnetic tape. Do not increase the running tension of the vehicle.

(Embodiment 3) FIG. 11 is a perspective view of a main part showing a configuration of a magnetic recording / reproducing apparatus provided with a tape damping apparatus according to Embodiment 3 of the present invention.
The running system of R is shown. In FIG. 11, reference numeral 111 denotes an entrance-side inclined post, 112 denotes an exit-side inclined post, and the same members as those in the first embodiment (FIG. 1) are denoted by the same reference numerals.

Next, the operation will be described. The magnetic tape 13 wound on the magnetic tape supply reel 3 travels by a retracting operation by the pinch roller 12 and the capstan 11, and is guided by the inclined posts 111 and 112 to the rotating drum 2. It is pressed and taken up on the take-up reel 4.

The outer peripheral surfaces of the inclined posts 111 and 112 of the present embodiment are made of a soft member. For example, a structure in which the outer peripheral surface of a metal post is wound with a sheet-like nonwoven fabric made of nylon fiber and having a total thickness of 150 μm is suitable.

According to the present embodiment, the magnetic tape 13 enters the magnetic tape 13 and comes into contact with the inclined post 111 or the inclined post 112,
The vibration of the magnetic tape is absorbed by the soft member. At the same time, dirt on the back surface of the magnetic tape can be removed.

In this embodiment, an example in which nylon fibers are used as the material of the non-woven fabric has been described. One or a combination of two or more of the above is subjected to carding, needle punching, pressing and the like to form a nonwoven sheet, which is punched into a cylindrical shape by a Thomson cutter or the like. Moreover, you may laminate | stack and use the thin sheet-shaped nonwoven fabric. Further, in order to increase the contact surface area, the nonwoven fabric sheets may be arranged in a water wheel shape.

The elasticity of the soft member has a great effect on the effect of the vibration damping device of the present embodiment. The elastic modulus of a soft member is
0.1 MPa or more and 2 MPa or less are desirable. The elastic modulus is 0.05MPa
If it is smaller, it is too soft to obtain a sufficient vibration damping effect.
The state of contact with the wire becomes worse, and a sufficient vibration damping effect cannot be obtained.

[0035]

As described above, the magnetic recording / reproducing apparatus provided with the tape damping device of the present invention has a rotary magnetic head and records audio and video by using the relative movement of the magnetic head and the magnetic tape. Low noise, high sound quality,
A highly reliable magnetic recording / reproducing device can be provided.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing a configuration of a magnetic recording / reproducing apparatus including a tape damping device according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of the tape damping device of FIG.

FIG. 3 is an example in which the state of vibration of a magnetic tape is measured by an optical micrometer.

FIG. 4 is a perspective view illustrating a configuration example of a tape damping device according to the first embodiment of the present invention.

FIG. 5 is a mechanism diagram in which the tape vibration damping device according to the first embodiment of the present invention contacts a magnetic tape only during recording.

FIG. 6 is an example diagram in which the tape damping device according to the first embodiment of the present invention is provided on the output side of the rotating drum to reduce the contact portion with the magnetic tape.

FIG. 7 is a main part perspective view showing a configuration of a magnetic recording / reproducing apparatus provided with a tape damping device according to a second embodiment of the present invention.

FIG. 8 is a perspective view showing a configuration of the tape damping device of FIG. 7;

FIG. 9 is a mechanism diagram in which the tape damping device according to the second embodiment of the present invention contacts a magnetic tape only during recording.

FIG. 10 is an example of a tape damping device according to a second embodiment of the present invention, in which a contact portion with a magnetic tape provided on an output side of a rotary drum is reduced.

FIG. 11 is a main part perspective view showing a configuration of a magnetic recording / reproducing apparatus provided with a tape damping device according to a third embodiment of the present invention.

FIG. 12 is a configuration diagram of a video camera which is a conventional magnetic recording / reproducing apparatus for recording audio and video.

[Explanation of symbols]

1, 71: vibration damping device, 2: rotary drum, 3: magnetic tape supply reel, 4: take-up reel, 5: guide post, 6: tension regulator, 7: rotary post, 8: erase head, 9: inclined post , 9A,
111… Entry side inclined post, 9B, 112… Outside inclined post, 10… Voice control head, 11… Capstan, 12… Pinch roller, 13… Magnetic tape, 14…
Rotating magnetic head, 15: Head mounting window, 16: Operating direction of vibration damper, 17: Head entry point, 18: Head release point, 21, 121: Rotating roller, 22, 51, 122 ... Non-woven fabric, 23 ... Rotating tool, 24 ... Rotating roller support part, 41 ... Audio input part by microphone, 42 ... Recording amplifier, 52,102 ...
53, 103: width of magnetic tape, 61: tape running system, 62: voice microphone input,
63 ... video camera input section, 81 ... metal outer periphery, 82 ... resin.

Continuation of front page (72) Inventor Keizo Miyata 1006 Kazuma Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd.

Claims (11)

[Claims] In a magnetic recording / reproducing apparatus in which a magnetic head performs a helical scan, a post damping device for suppressing vibration of a magnetic tape is brought into contact with the magnetic tape between a rotary drum and an inclined post. Magnetic recording / reproducing device provided. 2. A magnetic recording / reproducing apparatus in which a magnetic head performs a helical scan, wherein a post made of a non-woven fabric having an outer peripheral surface of a cylindrical surface is brought into contact with a magnetic tape between a rotary drum and an inclined post. A magnetic recording / reproducing device provided with a vibration device. 3. A magnetic recording / reproducing apparatus equipped with a tape damping device according to claim 2, wherein a post made of a non-woven fabric having an outer peripheral surface of a cylindrical surface is brought into contact with a magnetic tape only during recording. 4. A post made of a non-woven fabric whose outer peripheral surface of a cylindrical surface is made to contact only a part of the upper end side from the center in the width direction of the magnetic tape between the exit side of the rotary drum and the exit side inclined post. A magnetic recording / reproducing device comprising the tape damping device according to claim 2. 5. A magnetic recording / reproducing apparatus in which a magnetic head records and reproduces a sound and an image while performing helical scanning, and has a built-in microphone for recording the sound.
A tape damping device, characterized in that a post made of a non-woven fabric having an outer peripheral surface of a cylindrical surface is brought into contact with only a part of the upper end side from the center in the width direction of the magnetic tape between the rotating drum exit side and the exit side inclined post. Magnetic recording / reproducing device provided. 6. A magnetic recording / reproducing apparatus in which a magnetic head performs a helical scan, wherein a post made of a laminated material whose outer peripheral surface of a cylindrical surface is made of metal and resin is adhered to a magnetic tape between a rotary drum and an inclined post. A magnetic recording / reproducing device comprising a tape damping device, which is brought into contact. 7. The tape vibration damping device according to claim 6, wherein a post made of a laminated material having a cylindrical outer peripheral surface made of metal and having a resin adhered inside is brought into contact with the magnetic tape only during recording. Magnetic recording / reproducing device provided. 8. A post made of a laminated material in which the outer peripheral surface of the cylindrical surface is metal and resin is adhered to the inside thereof is provided at a part of the upper end side from the center in the width direction of the magnetic tape between the rotating drum exit side and the exit side inclined post. 7. A magnetic recording / reproducing apparatus comprising the tape vibration damping device according to claim 6, wherein the magnetic recording / reproducing device is in contact with the magnetic recording / reproducing device. 9. A magnetic recording / reproducing apparatus which records and reproduces a sound and an image while a magnetic head performs a helical scan and incorporates a microphone for recording the sound,
A post made of a laminated material in which the outer peripheral surface of the cylindrical surface was metal and resin was adhered to the inside thereof was brought into contact with only one portion on the upper end side from the center in the width direction of the magnetic tape between the rotating drum exit side and the exit side inclined post. A magnetic recording / reproducing device comprising a tape damping device. 10. A magnetic recording / reproducing apparatus in which a magnetic head performs a helical scan, wherein an outer peripheral surface of an inclined post is made of a soft member. 11. A magnetic recording / reproducing apparatus in which a magnetic head performs a helical scan, wherein a non-woven fabric is wound around an outer peripheral surface of an inclined post.