JPH06119690A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To provide the guide mechanism which reduces the variance in the lateral direction of a magnetic tape and is capable of carrying out magnetic recording and reproducing of high reliability. CONSTITUTION:A lower drum 2 around which a magnetic tape 11 which is recorded and reproduced in an oblique direction is run is provided with a step part 5 as the guide mechanism of high rigidity, and an upper drum 1 is provided with an elastic guide 6 which holds the upper end of the magnetic tape 11 by an elastic member. An air injection orifice 9 is provided in the drum outer peripheral surface together with this guide structure. Further, an elastic guide 6 is attached to the upper drum with a piezoelectric element between them. As the result, the magnetic tape is naturally run along the guide of high rigidity by the elastic guide, and even a thin magnetic tape is run with a high reliability without the edge damage.

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 capable of running a magnetic tape with high reliability.

[0002]

2. Description of the Related Art As a conventional technique, Japanese Utility Model Publication 3-51789
In the publication (rotary head device), a pair of upper and lower fixed guide drums are provided, and leads for restricting the running width of the magnetic tape are formed on the magnetic tape guide surfaces, and the distance between the leads is set to be substantially equal to the magnetic tape width. A rotary head device is disclosed.

[0003]

However, since the magnetic tape guide surface of each lead has a high rigidity in this rotary head device, when the gap between the leads is kept substantially equal to the width of the magnetic tape and the magnetic tape fluctuates, the magnetic Tape ends are damaged. On the other hand, if the space between the leads is kept larger than the width of the magnetic tape, the magnetic tape may meander and the position regulation effect may not be obtained.

An object of the present invention is to provide a guide mechanism capable of highly reliable magnetic recording / reproduction with little fluctuation in the width direction of the magnetic tape.

[0005]

The above object is to provide a rotary head provided on an outer peripheral portion of a rotary body, and a pair of columnar cylinders having substantially the same outer diameter as the rotary head and fixed to both axial sides of the rotary head. In a magnetic recording / reproducing apparatus comprising a drum, a magnetic tape runs along the outer peripheral surface of the drum, and the rotary head records / reproduces in / from the magnetic tape in an oblique direction. The stepped portion formed by enlarging the outer diameter of the portion not to be formed and the outer diameter of the other drum are the same outer diameter as the portion of the one drum on which the magnetic tape runs, and the magnetic tape is provided on the end surface opposite to the rotary head. This is achieved by providing an elastic material fixed so as to be orthogonal to the traveling direction.

The above object is provided with a rotary head provided on the outer peripheral portion of the rotary body, and a pair of cylindrical drums having substantially the same outer diameter as the rotary head and fixed to both axial sides of the rotary head.
In a magnetic recording / reproducing apparatus in which a magnetic tape runs along the outer peripheral surface of the drum, and the rotary head records / reproduces on / from the magnetic tape in an oblique direction, magnetic recording is performed on end faces of the both drums opposite to the rotary heads. This is achieved by providing an elastic material fixed so as to be orthogonal to the tape running direction.

[0007]

According to the above construction, the running magnetic tape is supported by the rotating head by supporting the lower end of the traveling magnetic tape by the step portion having high rigidity formed on one drum and holding the upper end by the elastic material fixed on the other drum. Since it is possible to guide with a uniform force against an external force oblique to the running direction applied to the magnetic tape, even a thin magnetic tape can be reasonably guided, and highly reliable running without edge damage becomes possible.

The elasticity of the elastic material is set by making the step surface formed on one drum and the elastic material surface fixed on the other drum parallel to each other and setting the distance between the surfaces to the width of the magnetic tape or a value smaller than the magnetic tape width. Since the magnetic tape securely holds the magnetic tape, the magnetic tape can be run with high accuracy without controlling the accuracy of attaching the elastic material to the drum with high accuracy.

The bimorph type piezoelectric element allows the elastic material to guide the magnetic tape with high-frequency vibration without difficulty, and further increases the reliability.

By providing a jet port for jetting air on the magnetic tape surface on the outer peripheral surface of the drum, friction between the magnetic tape and the drum surface can be reduced, and running of the magnetic tape with higher accuracy can be realized without running load.

[0011]

An embodiment of the present invention will be described below with reference to the drawings.

First, the structure of this embodiment will be described.

FIG. 1 is a perspective view of the elastic guide of this embodiment provided on an upper drum.

FIG. 2 is a vertical sectional view of the drum shown in FIG.

A head 8 is fixed to the outer periphery of the rotating body 24 via a head base 25, and the rotating body 24 is fitted to the drum shaft 10. The upper drum 1 is on the rotating body 24.
However, the lower drum 2 fixed below is fitted to the drum shaft 10 via a bearing 26, and the upper drum 1 and the lower drum 2 are
Are fixed in phase with each other by the drum fixing member 3. Further, below the lower drum 2, a drum motor 4 of a rotor portion for further rotating the drum shaft 10 is fitted to the drum shaft 10, and a stator portion facing the drum motor 4 is fixedly attached to the lower drum 2. There is. On the outer circumference of the lower drum 2, a lower drum guide 5 is provided which guides the lower edge of the magnetic tape 11 by a step at a constant angle with respect to the circumferential direction.

Further, the end surface of the upper drum 1 is an end surface whose outer peripheral portion is inclined so as to be parallel to the lower drum guide provided on the lower drum 2, and an elastic guide 6 made of an elastic material along the end surface. Is fixed to the end portion of the upper drum by the elastic guide fixing member 7.

The elastic guides 6 are arranged in several places along the magnetic tape path as shown in FIG.
It is assumed that the elastic guide 6 is provided with respect to the lower guide 5 at an interval 1 obtained by adding the tolerance δ to the width of the magnetic tape 11. The tolerance δ is −100 to 0 μm, and the spring constant k of the elastic guide 6 is k.
≦ 10 g / mm (per unit width of guide). The tip end of the elastic guide 6 is provided with an elastic guide taper portion 62 so as not to damage the magnetic tape 11 when the magnetic tape 11 is wound around the drum during threading, and the tip is wider than the width of the magnetic tape 11.

A plurality of air injection ports 9 are provided on the running surface around which the magnetic tape 11 is wound around the upper and lower drums, and the magnetic tape 11 is floated from the outer circumference of the drum by air pressure to run. Air piping 14 inside the drum
Air is sent by the lower drum air chamber partition plate 15 and the upper drum air chamber partition plate 16 to form an air chamber in each of the upper and lower drums, and the air is jetted from the air jet port 9 communicating with the air chamber. . Each of the air pipes 14 is provided with a stop valve (not shown), and supplies air only during operation.

FIG. 3 is a perspective view of an elastic guide of another embodiment provided on the upper drum.

FIG. 4 is a plan view of the integrated upper guide of FIG.

The upper drum 1, the lower drum 2 and the entire structure of the drum are the same as in FIG. 1, but in FIG. 1, only three elastic guides 6 are provided on the upper drum 1, and as shown in FIG. Integrated elastic guide 1 that guides the entire tape path
7, the guide portion at the front end is divided into strips, and each of the guide portions extends along the entire magnetic tape path at the magnetic tape winding portion on the drum as shown in FIG.
Since 1 is uniformly guided, high reliability can be obtained.

FIG. 5 is a perspective view in which an elastic guide of another embodiment is provided on the upper drum.

The upper drum 1, the lower drum 2 and the overall structure of the drum are the same as in FIG. 1, and the end surface of the upper drum has a sectional shape perpendicular to the axis like the drum used in the conventional VTR device. The guide dimensions of the elastic guides 19 attached from are set so that each can be guided along the magnetic tape path.

FIG. 6 is a sectional view showing an elastic guide of another embodiment provided on the upper drum.

Similar to FIG. 2, when the magnetic tape 11 is wound around the outer circumference of the drum, the elastic guide 20 having the elastic guide taper portion 62 at the tip is fixed to the bimorph type piezoelectric element 21 so as not to damage the magnetic tape 11, and fixed. It is attached to the end surface of the upper drum via a block 22. When the bimorph type piezoelectric element 21 is driven by the drive circuit 23, the elastic guide 20 can vibrate the magnetic tape 11 at a high frequency in the width direction and guide the magnetic tape 11 along the lower guide 5 without difficulty.

FIG. 7 is a perspective view when the elastic guide of the present invention is applied to a data storage device. A tape path using the drum 34 provided with the elastic guide 6 will be described with reference to FIG. The magnetic tape 11 is supplied from the supply reel 28 in the cartridge 27, the drum 34 winds the magnetic tape 11 around the drum 34 so as to be inside the traveling path of the magnetic tape, and then the guide roller 36 is mounted on the vacuum capstan 35. After being wound by, it is wound by the take-up reel 38. In the figure, from the supply reel 28 to the drum 3
Up to 4, the magnetic tape 11 has the same running surface, and also from the drum 34 to the take-up reel 38, the magnetic tape 11 also has the same running surface having an inclination angle generated by winding on the drum 34. . Further, the tension sensor 31 is provided on the traveling path from the supply reel 28 to the drum 34.
Is provided to detect the tape tension. Guides 32 and 33 are provided on the inlet side and the outlet side of the drum 34 to position the drum portion 34. Guide 3
2 and 33 are guided by a drum entrance side guide guide member 59 and a drum exit side guide guide member 60, respectively retractable, and are rotatably supported by a threading arm shaft 41 from a supply reel 28 in a cartridge 27 to a take-up reel 38. The threading pin 39 provided at the tip of the threading arm 40 also pulls out the tape tip, and there is no problem when mounting the tape. Similarly, the guide roller 36
Can also be evacuated. The threading pin 39 is tilted along the tape path by the three-dimensional cam 61 according to the rotation position of the threading arm shaft 41 that is tiltably supported.

The data storage device of the computer is
Since the data is written or read in the task processing order of the computer, not necessarily in the storage order, the magnetic tape 11 is rewound or wound up each time, and thus the magnetic tape 11 is frequently reciprocated. The tape 11 is not damaged and enables data storage without data errors.

FIG. 8 shows the elastic guide of the present invention as a commercial VTR.
It is a perspective view at the time of applying to a device. An embodiment using a drum provided with the elastic guide 6 of the present invention in a commercial VTR device will be described with reference to this drawing. Supply reel 42 in cassette
The magnetic tape 11 between the take-up reel 43 and the take-up reel 43 is loaded by the respective loading mechanisms (not shown).
It is pulled out along 5, 56, 57 and 58 and wound around the drum 34 along the lead. The running path of the magnetic tape will be described. The magnetic tape 11 sent from the supply reel 42 passes through the tension post 44, forms a path on the drum entrance side by the guide roller 47 and the inclined pin 48 via the impedance roller 46. Then, after passing the outer periphery of the drum, the direction is changed again by the inclined pin 49 and the guide roller 50 to a traveling path from the drum exit side path to the take-up reel, and is conveyed by the cabstan roller 53 and wound on the take-up reel 43. Taken.

Although there is a tendency to use a thin magnetic tape for recording / reproducing a VTR for a long time, a clear image can be obtained without damaging the magnetic tape 11 by the elastic guide of the present invention. As described above, according to the present embodiment, it is possible to guide and convey both sides of the magnetic tape without difficulty even if an external force obliquely acts on the magnetic tape traveling on the drum by the rotating head. Even if a thin magnetic tape is used for helical recording capable of high-capacity recording, highly accurate and highly reliable magnetic tape running without damage can be realized.

[0030]

According to the present invention, one end of a running magnetic tape is held by an elastic member fixed to a drum, so that it is uniform against external force applied to the magnetic tape by the rotary head with respect to an oblique direction. Since it can be guided with any force, even thin magnetic tape can be guided without difficulty, and high-reliability recording / reproduction without edge damage is possible.

[Brief description of drawings]

FIG. 1 is a perspective view in which an elastic guide according to an embodiment of the present invention is provided on an upper drum.

FIG. 2 is a vertical cross-sectional view of the drum of FIG.

FIG. 3 is a perspective view in which an elastic guide of another embodiment of the present invention is provided on an upper drum.

FIG. 4 is a plan view of the integrated upper guide of FIG.

FIG. 5 is a perspective view in which an elastic guide of another embodiment of the present invention is provided on an upper drum.

FIG. 6 is a cross-sectional view in which an elastic guide of another embodiment of the present invention is provided on the upper drum.

FIG. 7 is a perspective view when the elastic guide of the present invention is applied to a magnetic recording / reproducing apparatus.

FIG. 8 is a perspective view when the elastic guide of the present invention is applied to a commercial VTR.

[Explanation of symbols]

 1 Upper Drum 2 Lower Drum 3 Drum Fixing Member 4 Drum Motor 5 Lower Drum Guide 6 Elastic Guide 7 Elastic Guide Fixing Member 8 Head 9 Air Jet 10 Drum Shaft 11 Magnetic Tape 12 Entry Guide 13 Outlet Guide 14 Air Piping 15 Bottom Drum air chamber partition plate 16 Upper drum air chamber partition plate 17 Integrated elastic guide 18 Mounting hole 19 Elastic guide 20 Elastic guide 21 Bimorph type piezoelectric element 22 Fixed block 23 Piezoelectric element drive circuit 24 Rotating body 25 Head base 26 Bearing 34 Drum 62 Elastic guide taper

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayuki Munemoto 502 Jinritsu-cho, Tsuchiura-shi, Ibaraki Machinery Research Institute, Hiritsu Manufacturing Co., Ltd. Machinery Research Laboratory (72) Inventor Koetsu Okuyama 502 Jinritsucho, Tsuchiura-shi, Ibaraki Hiritsu Manufacturing Co., Ltd. Mechanical Research Laboratory (72) Inventor Shigeyuki Furuhata 2880 Kozu, Odawara, Kanagawa Hitachi Ltd. Odawara Plant Within

Claims (8)

[Claims] 1. A rotary head provided on an outer peripheral portion of a rotary body,
The rotary head is provided with a pair of cylindrical drums having substantially the same outer diameter and fixed to both sides in the axial direction of the rotary head. A magnetic tape runs along the outer peripheral surface of the drum, and the rotary head is In a magnetic recording / reproducing apparatus for recording / reproducing on / from a magnetic tape in an oblique direction, a step portion formed by enlarging an outer diameter of a portion of the one drum on which the magnetic tape does not travel, and an outer diameter of the other drum are the one A magnetic recording / reproducing apparatus having the same outer diameter as that of the magnetic tape running portion of the drum, and an elastic member fixed to the end face opposite to the rotary head so as to be orthogonal to the magnetic tape running direction. . 2. A rotary head provided on an outer peripheral portion of a rotary body,
The rotary head is provided with a pair of cylindrical drums having substantially the same outer diameter and fixed to both sides in the axial direction of the rotary head. A magnetic tape runs along the outer peripheral surface of the drum, and the rotary head is In a magnetic recording / reproducing apparatus for recording / reproducing on / from a magnetic tape in an oblique direction, an elastic material fixed so as to be orthogonal to the running direction of the magnetic tape is provided on end faces of the both drums opposite to the rotary head. Magnetic recording / reproducing device. 3. A step surface formed on the one drum,
2. The magnetic recording / reproducing apparatus according to claim 1, wherein the elastic material surface fixed to the other drum is parallel to each other, and the distance between the surfaces is set to a value equal to or smaller than the magnetic tape width. 4. The magnetic recording / reproducing apparatus according to claim 1, wherein the elastic material is an integral member that is bent at a tip end that abuts the magnetic tape and is branched into a plurality of strips. . 5. The magnetic recording / reproducing apparatus according to claim 1, wherein a piezoelectric element is provided on the elastic material. 6. The magnetic device according to claim 1, further comprising: an ejecting unit that ejects air from the outer peripheral surface of each of the drums to the magnetic tape surface. Recording / playback device. 7. A data storage device for a computer, wherein the magnetic recording / reproducing device according to any one of claims 1 to 6 is used. 8. A VTR for business use, comprising the magnetic recording / reproducing apparatus according to any one of claims 1 to 6.