JPH05101493A - Drum device - Google Patents

Abstract

PURPOSE:To provide a drum device capable of recording/reproducing correspondingly to both of an 8mm video tape and a digital audio tape and also capable of making this shared device low in cost, small in size and light in weight. CONSTITUTION:The shared part for winding the 8mm video tape and digital audio tape is provided in the drum device. For this arrangement, leads A, E and D, G corresponding to each of them are connected with connecting leads having shock absorbing operation. Thereby, each tape runs smoothly without coming into contact with parts other than the lead to be required, then the recording and reproducing operation can be executed. Consequently, the shared device corresponding to the plural magnetic tapes can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drum device capable of handling a plurality of types of tapes as a recording / reproducing means for magnetic tapes such as 8 mm video tapes and digital audio tapes.

[0002]

2. Description of the Related Art Conventionally, for recording and reproducing a signal on an 8 mm video tape recorder (hereinafter, VTR) or a digital audio tape recorder (hereinafter, DAT), a magnetic tape is wound around a drum device in a helical shape. Generally, the method of traveling by running (helical scan method) is used. As shown in FIG. 4 (A), such a drum device 1
Is generally composed of a rotatable upper drum 2 and a fixed lower drum 3. A head 4 that rotates with the upper drum 2 is provided on the lower surface of the upper drum 2. On the other hand, around the lower drum 3, as shown in FIG.
As shown in (B), a guide (called a lead) 6 that supports the lower edge of the magnetic tape 5 is provided. The lead 6 is formed at a constant angle (lead angle θ) with respect to the rotation direction of the drum device 1.

When recording and reproducing a signal on the magnetic tape 5 by the drum device 1 as described above, the tape 5 is wound around the drum device 1 by a loading mechanism (not shown) and is run. At this time, the upper drum 2 rotates at a high speed in the same direction as the tape 5 runs. The head 4 rotates together with the rotation of the upper drum 2 to record / reproduce signals on / from the tape 5. On the other hand, in the lower drum 3, since the tape 5 is regulated by the leads 6, the running of the tape 5 is always wound around a fixed position of the drum device 1.

By the way, in the above-mentioned tape format of the helical scan system, as shown in FIG. 5, the track is in an obliquely long state inclining in the tape length direction. In addition,
In this figure, K is the tape width (mm) and L is the track length (m
m) and N are the track center (mm), φ is the track angle (°), and α is the head gap azimuth angle (°).
For example, the tape format values of 8 mm VTR and DAT are as shown in FIG. What is important here is the track angle φ, which is currently 8 ° for a VTR of 4 ° 5.
4'13.2 ", DAT is defined as 6 ° 22'59.5". The track angle φ is always constant because the tape 5 is held by the leads 6 and has a constant angle. In this case, the diameter of the drum device 1 is
Any format can be selected as long as the format can be protected. Further, the lead angle θ that is important for keeping the track angle φ constant is determined by the diameter of the drum device 1.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
Recording and reproducing signals to and from a magnetic tape such as MVTR and DAT is a similar technique called a helical scan method using a rotating drum.

However, conventional 8 mm VTR and DA
Regarding the recording / reproducing of T, even if the similar techniques are used, the conditions of the tape format are different, so that the recording / reproducing of the other cannot be performed by one device. Also,
In order to make it a device that can be shared, it is necessary to separately provide a drum and a loading mechanism corresponding to each tape. Therefore, it is 8m in such common equipment.
Both mVTR and DAT can be recorded and reproduced, but the number of members increases and the assembly becomes complicated, which not only causes an increase in cost, but also increases the size of the device.

In order to solve this problem, it is conceivable that one drum is provided with different winding positions depending on the type of magnetic tape, and leads are formed on each winding position.
However, the tape winding portion must be provided on the loading mechanism side of the drum device. Therefore, if each lead is formed on the side of the loading mechanism, the diameter of the drum device 1 will be considerably large, and the shared device for recording and reproduction will be large.

Further, if the drum device 1 is downsized and the winding position of the tape is provided on the loading mechanism side, an overlapping portion will occur at the winding position of each magnetic tape. That is, the drum device is provided with the magnetic tape winding common portion.
However, since the lead angle differs depending on the type of magnetic tape, even if a lead corresponding to one type of tape is formed, it is impossible to prevent or hold the running of another type of tape. Therefore, the lead cannot be formed in this shared portion. Therefore, the tape cannot be sufficiently held by the lead and cannot be used as a drum device.

As described above, conventionally, it has not been possible to provide a drum device corresponding to a plurality of types of magnetic tapes such as 8 mm video tapes and digital audio tapes.

The present invention has been proposed in order to solve the problems of the prior art as described above, and its purpose is 8
To provide a drum device capable of recording and reproducing a plurality of types of magnetic tapes such as a mm video tape and a digital audio tape, and also capable of reducing the cost and the size of the shared device. Is.

[0011]

In order to achieve the above object, the present invention is provided with a rotating portion and a fixed portion as a recording / reproducing means for a magnetic tape such as an 8 mm video tape or a digital audio tape. Each drum, a head that rotates together with the rotating portion of the drum, and a lead that is formed in a stepwise manner on the fixed portion of the drum and serves as a tape guide, hold the magnetic tape on the lead and spirally wind it around the drum for running. In the system type drum device, the lead is formed by combining a plurality of angles according to the type of the magnetic tape.

[0012]

The operation of the present invention having the above construction is as follows.

That is, by providing each lead corresponding to a plurality of magnetic tapes such as 8 mm video tapes and digital audio tapes on one drum, the leads hold the tapes and record and reproduce these tapes. You can

[0014]

【Example】

(1) Representative Embodiment One embodiment of the present invention will be described with reference to FIGS.

The same members as those in the prior art are designated by the same reference numerals and the description thereof will be omitted.

That is, FIG. 1 is a plan view of the drum device showing the development angle of the lead, and FIG. 2 is an explanatory view of the development of the lead. The drum device 1 has a diameter of 30.038 mm. The magnetic tape winding position of the drum device 1 is provided with a development angle of 271 °. On the lower drum 3,
Leads are provided corresponding to the winding positions.
It consists of 7 continuous leads, drum 1
Leads A to G are arranged from the rotation direction side. The drum expansion angle and the lead angle θ for these leads A to G are
It looks like this: That is, the expansion angle is A: 170 °,
B: 9.5 °, C: 9.5 °, D: 45 °, E: 17
°, F: 7 °, G21 °. The lead angle θ is
A: 4 ° 52'44.4 ", B: -8 ° 44'45.
6 ", C: 10 ° 00'46.8", D: 6 ° 22 ',
E4 ° 52'44.4 ", F: 9 ° 47'20.2",
G: 6 ° 22 '. At this time, a part of the leads A to E is the winding position of the 8 mm video tape, and leads D to G are the winding positions of the digital audio tape. That is, the leads D and E are provided in the winding common portion of the 8 mm video tape tape and the digital audio tape.

The lead E is provided on the extension line of the lead A and the lead G is provided on the extension line of the lead D from the development angle and the lead angle θ described above. These extension lines are in close proximity to and overlap with each other between the leads DE, which are shared winding portions.

On the other hand, the upper drum 2 is provided with six heads 4 every 60 ° as shown in FIG. A double azimuth head is used as the head 4. The azimuth angle α of this head 4 is a set of two opposite azimuths.
One head is ± 15 ° corresponding to an 8 mm video tape and a digital audio tape, and the other two sets of four heads are ± 10 ° corresponding to an 8 mm video tape.

When recording / reproducing a magnetic tape with the drum device 1 as described above, the type of the inserted tape is identified by a sensor or the like, and then recording / reproducing is performed according to each tape. ..

That is, when recording and reproducing an 8 mm video tape with such a drum device, the lead angle θ is 4
The tape is wound from the lead A to a part of the lead E so that the development angle is 240 ° at 52 ° 44.4 ″, and the tape is held by the leads A and E, and recording / reproducing is performed in this state. The running speed of the tape is 14.345
mm / sec, the rotation speed of the drum device is 1800 rpm
Adjusted to. As a result, the track angle φ of this tape
Becomes 4 ° 54'13.2 ".

On the other hand, in the digital audio tape, the tape is wound from the lead D to the lead G so that the lead angle is 6 ° 22 'and the developing angle is 90 °, and the tape is held by the leads D and G. In this state, recording / reproducing is performed by a shared head having an azimuth angle of ± 15 °. The running speed of the tape at this time is 8.15 mm / sec.
In addition, the rotation speed of the drum device is adjusted to 2000 rpm. As a result, the track angle of this tape is 6 ° 22 '
It becomes 59.5 ".

Although the leads B and C are provided between the leads AE and the lead F is provided between the leads DG, these leads B, C and F act as connecting leads having a buffering action. The connecting leads B, C, and F are provided so that, when the respective tapes are wound, the leads other than the corresponding lead (AE or DG) in the winding common portion do not project.

Further, the leads D, which serve as a winding common part,
In E, the lead E is formed to have a larger expansion angle than required, and the angle of the lead C adjacent to the lead D is adjusted to adjust the positional deviation of the tape winding.

The diameter of the common drum for the 8 mm video tape and the digital audio tape described above was determined as follows. That is, when calculated from the tape format, it is 30.038 for an 8 mm video tape.
mm, 30.00 mm for digital audio tape
However, since a marginal area is provided on the track of the digital audio tape, some errors can be absorbed. Therefore, the common drum is 30.03.
Even if it is 8 mm, it can be used correspondingly.

As described above, the drum device of this embodiment can obtain the following effects.

That is, since the leads AE and DG corresponding to the 8 mm video tape and the digital audio tape are continuously provided on one drum 1, recording and reproduction can be performed corresponding to both tapes. it can. By setting a winding position and a lead angle corresponding to each tape at the time of loading the tape, recording and reproduction can be surely performed as the format of the tape.

Further, since each tape is sufficiently held by the lead and the lead angle can be sufficiently regulated, it is possible to accurately obtain the track angle which is important in the tape format.

Moreover, since the winding common portion is provided, the expansion angle becomes smaller than that in the wound state without overlapping. Therefore, it is possible to wind each tape without difficulty with one tape loading mechanism.

Further, even if the winding common portion is provided, the connecting lead B having a buffering action on the lead holding the tape,
Since C and F are provided, the magnetic tape is not obstructed by the leads other than the corresponding leads (A and E or D and G), and recording and reproduction can be performed smoothly. Further, even if the winding of the magnetic tape is misaligned in the winding common part, the misalignment can be absorbed because the corresponding lead has a margin.

As described above, since the drum device is provided as a common drum device, a device capable of recording and reproducing a plurality of magnetic tapes is provided with the same number of members and assembling process as the conventional 8 mm VTR and DAT. can do.

As described above, the drum device according to the present embodiment can record and reproduce data corresponding to both an 8 mm video tape and a digital audio tape, and provides an epoch-making inexpensive and compact shared device. be able to.

(2) Other Embodiments The drum device of the present invention is not limited to the above-described embodiment, and the specific shapes of the respective members, or the mounting positions and methods of the respective members can be appropriately changed. Is.

For example, the angle of the connecting leads and the expansion angle thereof, the expansion angle of each lead corresponding to the 8 mm video tape and the digital audio tape and the overlapping portion thereof, and the holding amount by the tape lead, etc. are set in the embodiments. The present invention is not limited to this, and can be changed as appropriate.

Further, as the heads, not only the head for a specific tape and the common head are used in combination, but all the heads can also be the common head.

Further, the drum device of the present invention is not limited to the drum device corresponding to the 8 mm video tape and the digital audio tape, and a plurality of types can be combined as long as they are magnetic tapes for recording / reproducing by the helical scan method. At this time, the drum diameter and the lead angle are derived from the track angle of the tapes to be combined, and the connected state of each lead and the connected lead can be obtained from these.

[0036]

According to the drum device of the present invention, since the drum is provided as a common drum corresponding to a plurality of magnetic tapes, as a device capable of recording / reproducing a plurality of magnetic tapes, the number of members and the assembly are required. Conventional process is 8
It is possible to provide a shared recording / reproducing device that is as compact and lightweight as the mmVTR or DAT alone.

[Brief description of drawings]

FIG. 1 is an explanatory view of a development angle of a lead provided in a drum device of the present invention.

FIG. 2 is a development explanatory view showing a lead when the drum device of FIG. 1 is expanded.

FIG. 3 is a plan view showing a head provided in the drum device of the present invention.

FIG. 4A is a perspective view showing a helical scan type drum device, and FIG. 4B is an enlarged sectional view of an essential part showing a lead and a head of FIG. 4A.

5 is an explanatory diagram showing a format of a magnetic tape in the device of FIG.

FIG. 6 is a table showing values in the format of FIG.

[Explanation of symbols]

 1 drum device 2 upper drum 3 lower drum 4 head 5 magnetic tape 6 lead A 8mm lead for holding video tape B connecting lead C connecting lead D lead for holding digital audio tape E lead for holding 8mm video tape F connecting Lead G Holds the digital audio tape K Tape width (mm) L Track length (mm) N Track center (mm) φ Track angle (°) α Head gap Azimuth angle (°) θ Lead angle

Claims (1)

[Claims] 1. A magnetic tape recording / reproducing device comprising a drum provided with a rotating portion and a fixed portion, a head rotating with the rotating portion of the drum, and a tape guide formed in a stepwise manner on the fixed portion of the drum. In a drum device of a method in which a magnetic tape is held by the lead and spirally wound around a drum and run, the lead is formed by combining a plurality of angles according to the type of the magnetic tape. Drum device characterized by.