JPH07296347A - Cylinder unit - Google Patents

Abstract

PURPOSE:To provide a cylinder unit in which a tape cassette is loaded/unloaded smoothly and surely to/from an opening while reducing the size effectively. CONSTITUTION:A first fixed cylinder 3 for guiding a magnetic tape is disposed coaxially with a rotary cylinder 2 or a rotary disc to which a rotary magnetic head is fixed. The rotary cylinder 2 or rotary disc is interposed between the first fixed cylinder 3 and a second fixed cylinder 13. The second fixed cylinder 13 has an upper end face being cut obliquely in accordance with the traveling angle of a magnetic tape or the circumferential part thereof is cut except the traveling face. A stator board 12 is secured to the drive motor part while inclining by a predetermined angle against the fixed central axis 1 from the orthogonal direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder device of a magnetic recording / reproducing device (hereinafter simply referred to as VTR) such as a video tape recorder.

[0002]

2. Description of the Related Art In a conventional device (VTR) for recording or reproducing information by helically scanning a head with respect to a tape, a cylinder having a plurality of magnetic heads in order to miniaturize its mechanical system. It has been proposed to put the device in the opening of the tape cassette to reduce the projected area. This system is often used especially in a miniaturized cylinder device by increasing the winding angle of a magnetic tape, a handy VTR with a camera, and the like. For example, Japanese Patent Laid-Open No. 3-238650 or
The device disclosed in Japanese Patent Publication No. 49549/1992 is known.

However, in the above-mentioned conventional example, since the rotary cylinder is provided in the upper part of the apparatus, in order to insert the rotary cylinder into the opening of the tape cassette, the cylinder device is arranged at an angle as horizontal to the cassette as possible. Will be required. In this case, since the tape is wound obliquely with respect to the rotary cylinder, the tape guide system becomes very complicated and reliability, tape running stability, etc. are deteriorated, and the cost is inevitably increased.

[0004]

To solve such a problem, a so-called M load path, which is a simplified tape guide system, has already been proposed (for example, National Technical Report).
t Vol.25., No.1, 1979Feb (p61 ~)). In this tape path system, all but the inclined pins in the front and rear of the rotary cylinder are horizontally arranged, which is significantly simplified. However, in this case, since the cylinder device is arranged with a large inclination, it is difficult to insert the cylinder device into the opening of the tape cassette.

In order to solve such a drawback, Japanese Patent Laid-Open No. 4-289
As disclosed in Japanese Patent Publication No. 549, there is also known an example in which a fixed cylinder as a semi-circular tape guide is arranged on a rotary cylinder so that the fixed cylinder can be inserted into a tape cassette in an M load. . However,
In such a configuration, since the drive motor section is arranged below the fixed cylinder, the entire cylinder device becomes thicker. Therefore, considering the projected area alone, this will be reduced, but the thickness itself will be considerably thicker. Therefore, miniaturization of the mechanical system could not be effectively realized.

In view of the above situation, it is an object of the present invention to provide a cylinder device that can smoothly and securely insert and remove the tape cassette into and from the opening and can effectively reduce the size.

[0007]

In a cylinder device of the present invention, a first fixed cylinder for guiding a magnetic tape and a rotary cylinder or a rotary disk to which a rotary magnetic head is fixed are arranged coaxially, and the rotary cylinder or the rotary cylinder is rotated. It has a second fixed cylinder arranged so as to interpose a disk between the first fixed cylinder and the first fixed cylinder, and in particular, the second fixed cylinder corresponds to the running angle of the magnetic tape. The upper end surface of the magnetic tape is cut diagonally, or the circumferential portion of the magnetic tape other than the running surface is cut, and the stator substrate of the drive motor unit is inclined at a predetermined angle from the orthogonal direction with respect to the fixed central axis. It is fixed.

Further, in the cylinder device of the present invention, a rotation driving motor section is arranged and arranged above the rotary cylinder or the rotary disk, and the second fixed cylinder for the second fixed cylinder is arranged on the stator substrate of the motor section. A support portion is provided.

[0009]

According to the present invention, the drive motor section is arranged inside the rotary cylinder, and a fixed semi-arcuate fixed cylinder is provided on the stator substrate of the drive motor section so as to be arranged above the rotary cylinder. This realizes a cylinder device in which the intermediate cylinder rotates without increasing the thickness of the cylinder device. Further, the miniaturized mechanical unit can be configured even in the M load path.

Further, there is a tendency for the tape cassette to become smaller and the opening portion of the tape cassette becomes smaller, which complicates the tape path and makes it difficult for the cylinder device to enter or bite. In such a case Also in the above, it is possible to realize a downsized mechanism portion and effectively deal with it.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a cylinder device according to the present invention will be described below with reference to FIGS.

FIG. 1 shows a sectional view of a cylinder device according to a first embodiment of the present invention. In the figure, reference numeral 1 denotes a central axis, which is fixed at the center of the fixed cylinder 3 by press fitting or adhesion. The transformer base 4 is rotatably supported on the central shaft 1 by bearings 5 and 6, and the rotary cylinder 2 is fixed to the transformer base 4. A plurality of magnetic heads 7 are set and fixed to the rotary cylinder 2 through a head substrate 8 at a predetermined phase and height.

A rotor side rotary transformer 9 of the rotary transformers 9 and 10 is adhered to a surface of the transformer base 4 opposite to the rotary cylinder 2, and a fixed side rotary transformer 10 is opposed to the rotary side transformer 9. Is glued to. The signals from the rotary transformers 9 and 10 are
It is sent to the magnetic head 7 via the contact piece 11. In this example, the rotation driving motor is directly connected to the upper portion of the rotating cylinder 2, that is, 14 in the drawing is a multi-pole magnetized rotor magnet, and the rotating cylinder 2 is connected via a rotor yoke 15. Fixed to.

A drive coil 16 is arranged on the stator substrate 12 so as to face the rotor magnet 14. A tape guide 13 as a fixed cylinder or as a fixed cylinder is fixed to the fixed central shaft 1 by press fitting or the like on the upper portion of the rotary cylinder 2 with a predetermined gap in the axial direction. The tape guide 13 is coaxially fixed to the rotary cylinder 2. The tape guide 13 has a substantially semicircular arc shape in plan view, and the drive coil 16 is arranged by utilizing the space of the remaining portion in the circumferential direction. By fixing the stator substrate 12 to the upper portion of the tape guide 13, the drive motor unit and the tape guide 13 can be integrally formed, and can be inserted into the opening portion of the tape cassette to form an ultra-thin cylinder device. can do.

FIG. 2 is a top view of the arrangement of the tape guide 13 and the stator of the drive motor. In this illustrated example, the number of magnetic poles, which is composed of three drive coils 16 of the drive motor, is 8
However, by arranging the three drive coils 16 near the center of the gap with respect to the inclination of the stator substrate 12 as in this example, a space can be secured in the stator substrate 12. Moreover, the rotation characteristics can be made uniform. Then, in this portion, the tape guide 13
It is possible to arrange the tape guide 13 together with the drive motor by arranging the supporting portion including the fixed portion to the central shaft 1 which is fixed.

As the structure of the drive motor, in addition to the 8 poles composed of the three drive coils 16 in the above-mentioned example, 6 poles and 10 poles are provided.
It is possible as long as it has 6 or more poles, such as a pole, 12 poles or 14 poles. Further, even when the number of drive coils is 6, if the number of poles is 12 or more, the size of the coil becomes small, and the space can be effectively secured on the stator substrate 12 as in the above embodiment. It is possible to arrange the tape guide 13 integrally with the drive motor.

FIG. 3 shows a sectional view of a cylinder device according to a modification of the first embodiment. This is an example of a tape rotation system in which the above-mentioned rotary cylinder 2 is eliminated, upper and lower fixed cylinders are adopted, and the magnetic head is projected from between the gaps so that only the magnetic head rotates.

In FIG. 3, similarly to the case of the rotary cylinder system in the above-described embodiment, the fixed center shaft 1 is press-fitted and fixed to the center of the fixed cylinder 3, and the center shaft 1 is provided with bearings 5 and 6. The transformer base 4 is rotatably supported. A plurality of magnetic heads 7 are attached to a rotating disk 17 with a predetermined phase and height via a head substrate 8. The rotor side rotary transformer 9 of the rotary transformers 9 and 10 is adhered to the surface of the transformer base 4 opposite to the rotary disk 17, and the fixed side rotary transformer 10 is adhered to the fixed cylinder 3 so as to face the rotor side rotary transformer 9. ing.

The signals from the rotary transformers 9 and 10 are sent to the magnetic head 7 via the contact piece 11. In this example, the rotation driving motor is directly connected to the upper portion of the rotating disk 17 and has a multi-pole magnetized rotor magnet 1.
4 is fixed to the rotary disk 17 via the rotor yoke 15.

A drive coil 16 is arranged on the stator substrate 12 so as to face the rotor magnet 14.
At the upper part of the rotary disk 17, a fixed cylinder 3 is axially provided.
And the fixed upper cylinder 18 is arranged with a predetermined gap. The fixed upper cylinder 18 is fixed to the fixed central shaft 1 by press fitting or the like, but is fixed so as to be arranged coaxially with the fixed cylinder 3.

The fixed upper cylinder 18 has its upper end surface cut obliquely or stepwise along the running of the magnetic tape. Therefore, since the press-fitting support portion of the fixed upper cylinder 18 with respect to the central axis 1 has a substantially semi-circular shape, a space is secured in the circumferential direction with respect to the support portion, and the drive coil 16 is arranged in this space. This makes it possible to integrally configure the drive motor unit and the fixed upper cylinder 18, which is the tape guide. Moreover, the stator substrate 12
Since it is inclined with respect to the vertical direction with respect to the axial direction, it can be inserted into the opening of the tape cassette, and an ultra-thin cylinder device can be configured.

In the above embodiment, the tape guide 13 or the fixed upper cylinder 18 serving as a tape guide is supported by the fixed central shaft 1 by press fitting or the like, but another base is press fitted into the central shaft 1. Then, the stator substrate 12 may be attached and the tape guide 13 or the fixed upper cylinder 18 may be attached to the outer periphery of the stator substrate 12, and the same effect as in the case of the above-described embodiment can be obtained.

Next, a second embodiment of the cylinder device according to the present invention will be described. FIG. 4 shows a sectional view of the cylinder device according to the second embodiment. In the figure, reference numeral 1 denotes a central axis, which is fixed at the center of the fixed cylinder 3 by press fitting or adhesion. The transformer base 4 is rotatably supported on the central shaft 1 by bearings 5 and 6, and the rotary cylinder 2 is fixed to the transformer base 4. A plurality of magnetic heads 7 are set and fixed to the rotary cylinder 2 through a head substrate 8 at a predetermined phase and height.

A rotor side rotary transformer 9 of the rotary transformers 9 and 10 is adhered to a surface of the transformer base 4 opposite to the rotary cylinder 2, and a fixed side rotary transformer 10 is opposed to the rotary side transformer 9. Is glued to. The signals from the rotary transformers 9 and 10 are
It is sent to the magnetic head 7 via the contact piece 11. In this example, the rotary driving motor is directly connected to the upper portion of the rotary cylinder 2, that is, 14 is a multi-pole magnetized rotor magnet, which is fixed to the rotary cylinder 2 via a rotor yoke 15. To be done.

A drive coil 16 is arranged on the stator substrate 12 so as to face the rotor magnet 14. A tape guide 19 as a fixed cylinder or as a fixed cylinder is fixed to the fixed central shaft 1 by press fitting or the like on the upper part of the rotary cylinder 2 with a predetermined gap in the axial direction. The tape guide 19 is coaxially fixed to the rotary cylinder 2. The tape guide 19 has a substantially semicircular arc shape in a plan view, and the drive coil 16 is arranged by utilizing the space of the remaining portion in the circumferential direction. By fixing the stator substrate 12 to the upper portion of the tape guide 19, the drive motor unit and the tape guide 19 can be integrally formed, and can be inserted into the opening portion of the tape cassette to form an ultra-thin cylinder device. can do.

FIG. 5 is a top view of the arrangement of the tape guide 19 and the stator of the drive motor. In this illustrated example, the number of magnetic poles, which is composed of three drive coils 16 of the drive motor, is 8
This is an example of the case, but by arranging the three drive coils 16 so as to be offset to one side as in this example, a space can be secured in the stator substrate 12. By arranging the support portion including the mounting portion of the tape guide 19 fixed to the central shaft 1 in this portion, it is possible to arrange the tape guide 19 together with the drive motor.

As the constitution of the drive motor, in addition to the 8 poles composed of the three drive coils 16 in the above-mentioned example, 6 poles and 10 poles are provided.
It is possible as long as it has 6 or more poles, such as a pole, 12 poles or 14 poles. Further, even when the number of drive coils is 6, if the number of poles is 12 or more, the size of the coil becomes small, and the space can be effectively secured on the stator substrate 12 as in the above embodiment. It is possible to arrange the tape guide 19 integrally with the drive motor.

FIG. 6 is a top view of the arrangement of the tape guide 19 and the stator of the drive motor in the case of the drive coil 16 having 12 magnetic poles. Since each of the six drive coils 16 is smaller than that shown in FIG. 5, by disposing these drive coils 16 on one side, the tape guide 19 is fixed to the central axis 1. It becomes possible to dispose the supporting portion including the mounting portion on the stator substrate 12.

FIG. 7 shows a sectional view of a cylinder device according to a modification of the second embodiment. This eliminates the rotary cylinder 2 (FIG. 4) in the second embodiment described above, employs upper and lower fixed cylinders, projects the magnetic head from the gap between them, and rotates only the magnetic head. It is an example of a tape rotation system.

In FIG. 7, the structure is basically the same as the case of the rotary cylinder system in the second embodiment, but a plurality of magnetic heads 7 are arranged at predetermined phases and heights via a head substrate 8. It is attached to the rotating disk 20. The rotor side rotary transformer 9 of the rotary transformers 9 and 10 is adhered to the surface of the transformer base 4 opposite to the rotary disk 20, and the fixed side rotary transformer 10 is adhered to the fixed cylinder 3 so as to face it. ing. Further, in this example, the rotation driving motor is directly connected to the upper portion of the rotating disk 20, and the multi-pole magnetized rotor magnet 14 is fixed to the rotating disk 20 via the rotor yoke 15.

A drive coil 16 is arranged on the stator substrate 12 so as to face the rotor magnet 14.
At the upper part of the rotating disk 20, a fixed cylinder 3 is axially provided.
The fixed upper cylinder 21 is arranged with a predetermined gap between the fixed upper cylinder 21 and the fixed upper cylinder 21. The fixed upper cylinder 21 is fixed to the fixed central shaft 1 by press fitting or the like, but is fixed so as to be arranged coaxially with the fixed cylinder 3.

The fixed upper cylinder 21 has its upper end surface cut obliquely or stepwise along the running of the magnetic tape. Therefore, the press-fitting support portion of the fixed upper cylinder 21 with respect to the central axis 1 has a substantially semi-circular shape, and a space is secured in the circumferential direction with respect to the support portion, and the drive coil 16 is arranged in this space. As a result, the drive motor portion and the fixed upper cylinder 21 which is the tape guide can be integrally formed, and can be inserted into the opening portion of the tape cassette, and an ultrathin cylinder device can be formed.

In the second embodiment, the tape guide 19 or the fixed upper cylinder 21 as the tape guide is supported by the fixed central shaft 1 by press fitting or the like. However, another pedestal is mounted on the central shaft 1. The stator substrate 12 may be press-fitted to be attached, and the tape guide 19 or the fixed upper cylinder 21 may be attached to the outer periphery of the stator substrate 12, and the same effect as the above case can be obtained.

[0034]

As described above, according to the present invention, the drive motor is arranged on the upper part of the rotary cylinder, the fixed cylinder is arranged on the upper part in a semi-arcuate shape, and the drive coil of the stator is arranged close to one side. By doing so, the space can be effectively secured. Since the fixed cylinder and the supporting portion can be arranged in that space, the drive motor and the fixed tape guide are integrally formed, the thickness of the cylinder device is reduced, and the tape cassette is significantly prevented from entering the opening portion. A cylinder device that facilitates has been realized.
Further, the upper and lower cylinders are fixed, and it is possible to provide the same in the case of a system in which only the tip of the magnetic head rotates.

Further, the fixed tape guide is press-fitted into the fixed central axis, and the accuracy of the coaxial is remarkably improved, and conventionally, the fixed tape guide cannot be screwed from the lateral direction. Since is cut in a semi-circular shape or diagonally, it is possible to screw it from the side. The same applies to the fixed upper cylinder, and the assembling accuracy is further improved because the central fixed shaft is screwed to the center fixed shaft. Therefore, reassembling and the like are facilitated and serviceability is improved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration example according to a first embodiment of a cylinder device according to the present invention.

FIG. 2 is a plan view showing the positional relationship between the tape guide and the stator portion of the drive motor in the first embodiment of the present invention.

FIG. 3 is a sectional view showing a modified example of the first embodiment of the cylinder device according to the present invention.

FIG. 4 is a cross-sectional view showing a configuration example of a cylinder device according to a second embodiment of the present invention.

FIG. 5 is a plan view showing an arrangement relationship between a tape guide and a stator portion of a drive motor according to a second embodiment of the present invention.

FIG. 6 is a plan view showing another arrangement relationship of the tape guide and the stator portion of the drive motor in the second embodiment of the present invention.

FIG. 7 is a sectional view showing a modification of the second embodiment of the cylinder device according to the present invention.

[Explanation of symbols]

 1 center axis 2 rotating cylinder 3 fixed cylinder 4 transformer stand 5, 6 bearing 7 magnetic head 8 head substrate 9, 10 rotary transformer 11 contact piece 12 stator substrate 13 tape guide 14 rotor magnet 15 stator yoke 16 drive coil 17 rotating disk 18 fixed Upper cylinder 19 Tape guide 20 Rotating disk 21 Fixed upper cylinder

Claims (2)

[Claims] 1. A first fixed cylinder for guiding a magnetic tape and a rotary cylinder or a rotary disk to which a rotary magnetic head is fixed are arranged coaxially, and the rotary cylinder or the rotary disk is placed between the first fixed cylinder and the rotary cylinder. In a cylinder device having a second fixed cylinder arranged so as to be interposed between the second fixed cylinder and the magnetic tape, the upper end surface of the second fixed cylinder is obliquely cut according to the running angle of the magnetic tape, or A cylinder device in which a circumferential portion other than a running surface of the tape is cut, and a stator substrate of a drive motor unit is fixed by being inclined at a predetermined angle from a direction orthogonal to a fixed central axis. 2. A first fixed cylinder for guiding a magnetic tape and a rotary cylinder or a rotary disk to which a rotary magnetic head is fixed are arranged coaxially, and the rotary cylinder or the rotary disk is placed between the first fixed cylinder and the rotary cylinder. In a cylinder device having a second fixed cylinder arranged so as to be interposed between the rotary cylinder and the rotary cylinder, a rotary drive motor unit is arranged above the rotary cylinder or the rotary disc, and the rotary drive motor unit is provided on the stator substrate of the motor unit. 2. A cylinder device provided with a support portion for the second fixed cylinder.