JPH0991602A - Rotary drum device and recording or reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a rotary drum device realizing the reduction in cost and also realizing the substantial miniaturization of the device. SOLUTION: The rotary drum 2 provided with a magnetic head 12 and a fixed drum 3 provided with a head 13 for guiding a magnetic tape are arranged rotatably each other through a center shaft 4b. A driving motor composed of a motor rotor part and a motor stator part is arranged on the appropriate position at the side of rotary drum 2, and a tape control member 19 capable of bringing into contact with the edge part of magnetic tape at the winding start point of magnetic tape is formed by a structural member of the motor stator part. The motor stator part is provided with a driving coil 15, motor yoke 16, and a spacer 17 interposed between the driving coil 15 and motor yoke 16, then the tape control member 19 is constituted by extendedly forming a part 17a of the spacer 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording or reproducing apparatus such as a video tape recorder (VTR) or R-DAT, and in particular, a magnetic tape drawn out from a cassette is wound around a drum peripheral surface in a spiral shape. The present invention relates to a rotary drum device for recording or reproducing information on the magnetic tape.

[0002]

2. Description of the Related Art FIGS. 5 and 6 show an example of the configuration of a conventional rotary drum device. In this rotary drum device, the upper end of the drum is located below the upper edge of the magnetic tape at the winding start point of the magnetic tape, and the upper edge portion of the magnetic tape is contacted at the winding start point of the magnetic tape. A possible tape regulation member is arranged. And, by doing so, the device can be made smaller and thinner.

In the figure, a rotary drum device 1 comprises a rotary drum 2 having a magnetic head 12 for recording or reproducing and a lower fixed drum 3 having a tape lead 13 for guiding a magnetic tape 14. There is. Reference numeral 4 denotes a shaft-integrated bearing, which is composed of a housing 4a and a fixed central shaft 4b. The rotary drum 2 is press-fitted and fixed to the housing 4a, and the central shaft 4b is press-fitted and fixed to the fixed drum 3. The rotating drum 2 and the fixed drum 3 have a central shaft 4b.
Are arranged coaxially.

The motor magnet 5 is a magnet holder 6
And the magnet holder 6 is further fixed to the rotary drum 2 by means of screws. By facing the motor magnet 5, the drive coil 7, the motor yoke 8 for preventing the leakage of the magnetic field, and the spacer 9 interposed between the drive coil 7 and the motor yoke 8 for adjusting the attractive force by the magnetic force. A configured stator member is disposed. This stator member is supported by the motor pedestal 10 fixed to the central shaft 4b, and thus fixed to the central shaft 4b. A tape regulation member 11 is fixed to the upper side of the motor pedestal 10 by a screw so as to come into contact with the upper edge portion of the magnetic tape 14 near the winding start point of the magnetic tape 14.

In the rotary drum device 1, the magnetic tape 14 is helically wound around the drum peripheral surface while being guided by the tape leads 13, and the rotary drum 2 is driven by passing a current through the drive coil 7.
Rotates. As a result, the magnetic head 12 becomes
By sliding along the track No. 4, signals are recorded on or reproduced from the magnetic tape 14. In this case, at the winding start point of the magnetic tape 14, the rotary drum 2
Of the magnetic tape 14 is located below the upper edge of the magnetic tape 14. The tape regulation member 11 contacts the upper edge portion of the magnetic tape 14 protruding from the upper end of the rotating drum 2 during the recording or reproducing operation, and makes the magnetic tape 14 run stably.
It is possible to secure a good head touch for No. 4.

Here, FIG. 7 shows an example of an output envelope waveform in the magnetic head 12. Since a good head touch can be obtained by the tape regulating member 11 as described above, a sharp waveform is obtained as indicated by a dotted line in the figure, and a stable output can be obtained. On the other hand, in the output envelope waveform in the case where the tape regulating member 11 is not provided, the output particularly decreases or becomes unstable at the tape inlet side as shown by the solid line,
It is extremely effective to provide the tape regulating member 11 in order to obtain an appropriate output waveform as described above.

[0007]

However, in the conventional rotary drum device 1, the magnetic tape 1 of the magnetic head 12 is used.
In order to obtain a good head touch with respect to No. 4, the tape regulating member 11 is provided separately and independently, so that the number of parts and the number of assembling steps are increased, and as a result, the cost is inevitably increased. Further, the tape regulating member 11 is attached to the motor pedestal 10
Since it is arranged on the upper side of the device, the device becomes bulky accordingly, and it has not been possible to effectively meet the demand for the device to be small and thin.

In view of such circumstances, it is an object of the present invention to provide a rotary drum device which realizes cost reduction and substantial size reduction of the device.

[0009]

In a rotary drum device of the present invention, a rotary drum having a magnetic head and a fixed drum having a lead for guiding a magnetic tape are rotatable with respect to each other via a central axis. In a rotary drum device arranged to record or reproduce information on or from the magnetic tape wound around the drum circumferential surface, a drive motor including a motor rotor part and a motor stator part is arranged at an appropriate position on the rotary drum side. A tape regulating member configured to contact the edge portion of the magnetic tape at the winding start point of the magnetic tape is constituted by the constituent members of the motor stator portion.

Further, in the rotary drum device of the present invention,
The motor stator portion has a drive coil, a motor yoke, and a spacer interposed between the drive coil and the motor yoke, and the tape regulating member is formed by extending a part of the spacer. .

[0011]

According to the present invention, although the drive motor for driving the rotary drum to rotate is provided, the tape regulation member is constituted by the constituent members of the motor stator portion constituting the drive motor. That is, the tape regulating member is formed integrally with a part of the motor stator portion, that is, especially with the spacer. This makes it possible to reduce the number of parts and ensure a good head touch by the tape regulation member.
Further, by effectively utilizing the constituent members of the motor stator portion, it is possible to effectively realize the miniaturization of the device.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a rotary drum device according to the present invention will be described below with reference to FIGS. To do.

First, an example of the overall structure of a recording or reproducing apparatus equipped with the rotary drum device of the present invention will be described. 1 and 2, the recording or reproducing device 100 includes a rotating drum device 101. This rotating drum device 101
Is placed in place on the main chassis 102, while
A tape reel or the like is arranged on the slide chassis 103 configured to be slidable with respect to the main chassis 102 (see the double-headed arrow in FIG. 1). That is, in this example, the main chassis 102 and the slide chassis 103 have separate structures, and the tape cassette 200 mounted on the slide chassis 103 (cassette mounting member) is attached to the rotary drum device 101.
With respect to (respectively corresponding to the states shown in FIGS. 1 and 2).

Further, the recording or reproducing apparatus 100 includes a capstan 104, a capstan motor 105, a tape guide member 106 for pulling out a tape on the tape entrance side with respect to the rotary drum device 101, and a tape pullout on a tape exit side with respect to the rotary drum device 101. The tape guide member 107 and the like are provided.

As shown in FIG. 1, the tape loading operation in the recording / reproducing apparatus 100 is performed after the tape cassette 200 is mounted on the slide chassis 103 and then the tape guide members 106 and 107 are used to magnetically insert the tape cassette 200 from the opening 200a of the tape cassette 200. At the same time as the tape 201 is pulled out, the slide chassis 103 slides toward the rotary drum device 101. And
As shown in FIG. 2, the rotary drum device 101 has the opening 2
00a and the tape guide member 106
And 107, the magnetic tape 201 is wound around the peripheral surface of the rotary drum device 101. Thus, according to this recording / reproducing apparatus 100, recording / reproducing can be performed by causing the magnetic tape 201 to travel along a predetermined tape path.

Now, the rotary drum device 101 used in the recording or reproducing apparatus 100 according to the present invention outlined above.
Will be described in detail. 3 is a perspective view of an embodiment of the present invention device, and FIG. 4 is a cross-sectional view of an embodiment of the present invention device.
The rotary drum device 101 according to this embodiment includes a rotary drum 2 having a magnetic head 12 for recording or reproducing and a lower fixed drum 3 having a tape lead 13 for guiding a magnetic tape 14. Reference numeral 4 denotes a shaft-integrated bearing, which is composed of a housing 4a and a fixed central shaft 4b. The rotary drum 2 is press-fitted and fixed to the housing 4a, and the central shaft 4b is press-fitted and fixed to the fixed drum 3. The rotating drum 2 and the fixed drum 3 have a central shaft 4b.
Are arranged coaxially. Note that these configurations are substantially the same as those of the conventional example.

A drive motor composed of a motor rotor portion and a motor stator portion is arranged at an appropriate position on the rotary drum 2 side. The motor magnet 5 is held by a magnet holder 6 in one of the motor rotors constituting the drive motor, and this magnet holder 6 is further fixed to the rotating drum 2 by means of screws. The other motor stator portion is arranged so as to face the motor magnet 5. The motor stator portion includes the drive coil 15, the motor yoke 16 for preventing the leakage of the magnetic field, and the drive coil 15 and the motor yoke 1 for adjusting the attraction force by the magnetic force.
6 and a spacer 17 interposed therebetween.

The motor stator portion is supported by a motor pedestal 18 fixed to the central shaft 4b, and thus the central shaft 4b.
It is fixed to b. The spacer 17 is fixed to the motor pedestal 18 by screwing. The spacer 17 is also made of a resin material, and a part of the spacer 17 is extended to the vicinity of the winding start point of the magnetic tape 14. The end portion 17a of the spacer 17 thus extended is arranged so as to be able to contact the upper edge portion of the magnetic tape 14 at the upper end of the rotary drum 2, that is, the end portion 17a constitutes the tape regulating member 19. To be done.

In the rotary drum device 101 having the above-described structure, the magnetic tape 14 is wound around the drum circumferential surface in a helical manner while being guided by the tape lead 13, and a current is passed through the drive coil 7 to rotate the rotary drum. 2 rotates. As a result, the magnetic head 12 slides along the track of the magnetic tape 14 to record or reproduce a signal on the magnetic tape 14.

In the recording or reproducing operation, the magnetic tape 1
At the winding start point of 4, the upper end of the rotating drum 2 is located below the upper edge of the magnetic tape 14. At the upper end of the rotating drum 2 at the winding start point of the magnetic tape 14, the tape regulating member 1 including the end portion 17a of the spacer 17 is formed.
9 are arranged. The tape regulation member 19 contacts the upper edge portion of the magnetic tape 14 protruding from the upper end of the rotating drum 2 during the recording or reproducing operation, and the magnetic tape 14
To run stably. As a result, a good head touch of the magnetic head 12 on the magnetic tape 14 can be ensured.

In the above embodiment, the example in which the spacer 17 and the motor pedestal 18 are provided as separate members has been described. However, these members may be integrally molded using a resin material, and in this case, simplification of the configuration, etc. Is advantageous to.

[0022]

As described above, according to the present invention, in the recording or reproducing apparatus of this type provided with the tape regulating member for ensuring a good head touch, the tape regulating member and especially the spacer are integrated. As a result, the number of parts and the number of assembly steps can be reduced, and the cost can be effectively reduced. Further, there is an advantage that the miniaturization of the device can be effectively realized by effectively using the constituent members of the motor stator portion to form the tape regulating member.

[Brief description of drawings]

FIG. 1 is a plan view showing an example of the overall configuration of a recording or reproducing apparatus equipped with a rotary drum device of the present invention.

FIG. 2 is a plan view showing an example of the overall configuration of a recording or reproducing apparatus equipped with the rotary drum device of the present invention.

FIG. 3 is a perspective view of an embodiment of the rotary drum device of the present invention.

FIG. 4 is a vertical cross-sectional view of an embodiment of the rotary drum device of the present invention.

FIG. 5 is a perspective view of a conventional rotary drum device.

FIG. 6 is a vertical sectional view of a conventional rotary drum device.

FIG. 7 is a diagram showing an example of an output waveform of a magnetic head in a conventional rotary drum device.

[Explanation of symbols]

 2 rotating drum 3 fixed drum 4 shaft-integrated bearing 5 motor magnet 6 magnet holder 12 magnetic head 13 tape lead 14 magnetic tape 15 drive coil 16 motor yoke 17 spacer 18 motor pedestal 19 tape regulation member

Claims (3)

[Claims] 1. A rotating drum having a magnetic head and a fixed drum having a lead for guiding a magnetic tape,
A rotary drum device that is arranged to be rotatable relative to each other via a central axis, and that records or reproduces information on or from the magnetic tape wound around the drum peripheral surface. A drive motor including a motor stator portion is arranged and configured, and the constituent member of the motor stator portion constitutes a tape regulation member that can contact an edge portion of the magnetic tape at a winding start point of the magnetic tape. Characteristic rotary drum device. 2. The rotary drum device according to claim 1, wherein the motor stator portion includes a drive coil, a motor yoke, and a spacer interposed between the drive coil and the motor yoke, and the spacer A rotary drum device, wherein the tape regulating member is formed by extending a part of the tape. 3. The rotary drum device according to claim 1, which has a head for recording or reproducing information on a magnetic tape, and a cassette for storing the magnetic tape, wherein the cassette is installed. A cassette mounting member that supports the rotating drum device so as to be movable back and forth, and a tape guide member that pulls out the magnetic tape from the cassette and runs the magnetic tape along a predetermined tape path. A recording or reproducing device characterized by the above.