JPH0351789Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a rotary head device suitable for use when recording digital signals on a magnetic tape.

[Summary of the idea]

The present invention ensures that the magnetic tape is properly rotated even if the precision of assembling the rotary head device to electronic equipment (digital signal recording/reproducing device) or the mounting (contact) precision of the magnetic tape to the rotary head device is low. It is designed to be guided by a head device, and is particularly suitable for use with magnetic tapes having a small width.

[Conventional technology]

Even in conventional VTR (magnetic recording and reproducing equipment),
It is known to record digital signals on this. However, in conventional VTRs, at least the lower drum of the rotating magnetic head device is a fixed drum, and a lead for guiding the lower edge of the tape is formed on this drum, and the entire electronic equipment of the rotating magnetic head device is mounted. By adjusting the so-called tilt angle relative to the panel (mechanical chassis) or the inclination of the tape guide (relative to the mounting panel), the lower edge of the magnetic tape is brought into pressure contact with the above-mentioned lead of the fixed drum. Further, the magnetic tape runs, for example, on approximately half the circumference of the rotating magnetic head device, and means is provided for bringing the magnetic tape into pressure contact with the leads at multiple locations along this running path. By means of such means, the magnetic tape is forced to run precisely at a predetermined position on the rotating magnetic head device.
However, as is clear from the above description, since one side edge of the magnetic tape is brought into pressure contact with the lead, there is a drawback that extra lateral pressure is applied to the tape.

In response, the following devices have been proposed.

That is, FIGS. 1 and 2 are a front view and a cross-sectional view taken along the line A-A of an example of the previously proposed device, and in the figures, 1 is a rotary head, 2 is an upper fixed drum, and 3 is a It is a lower fixed drum. Both drums 2 and 3 are connected and fixed to each other at a portion of their circumferences by means of a fixture 4. Reference numeral 5 denotes a cylindrical portion, which is formed to extend downward from the lower end surface of the lower drum 3. Incidentally, both drums 2 and 3 can be made of AHS, that is, aluminum alloy, or die-cast. 6a and 6b are bearings, 7 is a rotating shaft,
The above-mentioned bearing 6a is inserted into the inside of the cylindrical part 5.
and 6b. 8 is a rotating body, which is rotatably attached to the upper part of the rotating shaft 7. Magnetic heads 9a and 9b are attached to the outer periphery of the rotating body 8 with an angular interval of 180°. 10 is a so-called rotating transformer, 10a is its rotating part, 10
b is a fixed part. 11 is a motor; 11a
is its stator, and 11b is its rotor. The stator 11a is attached to the outer periphery of the cylindrical portion 5 mentioned above. Upper drum 2 and lower drum 3 in the figure
Each shows a case where the outer circumferential surface is formed as a cylindrical surface centered on the axis of the rotating shaft 7, and the magnetic tape (not shown) covers an approximately 180° angular range of this cylindrical surface. You will be guided throughout. Both drums 2 and 3 thus form a fixed guide with a guide surface 14 for the magnetic tape.

A pair of fixed guides like this, namely the upper drum 2
Leads 12 and 13 are formed on the tape guide surface 14 of the lower drum 3 and the tape guide surface 14 of the lower drum 3, respectively. In this case, the tape guide surface 14 divided by the leads 12 and 13 is formed to be oblique to the rotating surface of the magnetic heads 9a and 9b when viewed from the front of the device, as is clear from FIG. It is something to do.
Also, the distance l between the leads 12 and 13 is selected to be approximately equal to the width of the magnetic tape used for this, and in reality it is several tens of tens of meters wider than the width of the magnetic tape in the running state guided by this device. It is preferable to form it as wide as ~ several hundred microns.

Practically speaking, it is preferable that the width of the leads 12 and 13 is slightly wider near the lead-in and lead-out areas of the magnetic tape, that is, at the left and right ends in FIG.

However, in such a device, since each lead and the connecting portion are formed separately, the configuration and assembly are complicated, and at the time of assembly, it is particularly difficult to adjust the spacing between the leads.

The present invention avoids these drawbacks.

〔Example〕

An example of the apparatus according to the present invention will be described below with reference to the drawings.

3 and 4 show an embodiment of the rotary head device according to the present invention. In the drawings, parts corresponding to those in FIGS. 1 and 2 described above are designated by the same reference numerals, and explanations thereof will be omitted. In this example, the upper fixed drum 2 and the lower fixed drum 3, that is, a pair of fixed guides, are integrally connected to each other by a rear connecting portion 15, and leads 12 and 13 are formed on the cylindrical surface, that is, the tape guide surface 14, respectively. In the case that
Further, a protruding part 16 is provided at the rear of the connecting part 15, and a through hole 17 is formed in the protruding part 16. By inserting the rotary shaft 7 into the through hole 17 and rotatably bearing it, the above-mentioned structure can be achieved. This is a case where a similar operation is performed.

Therefore, in this example, since both the drums 2 and 3 are integrally formed in advance, their center axes do not change due to aging or the like and can always be kept normal. In addition, the configuration and assembly are simplified, and there is no need to particularly adjust the lead spacing during assembly.

[Effect of idea]

According to the present invention described above, since the magnetic tape is guided between the pair of upper and lower leads 12 and 13, the rotary head is not used as the means for pressing the tape against only one lead as described at the beginning. There is no need to accurately adjust the tilt angle of the device or the inclination of the tape guide, etc., and the tape can be accurately guided between a pair of leads 12 and 13 with a simple configuration, and a pair of upper and lower fixed guide drums can be connected. Since the connecting member is also integrally formed, the assembly structure is simplified, and there is no need to particularly adjust the distance between the pair of leads during assembly.

In the figure, the rotating head device according to the present invention is shown in a vertical state, but in reality, the rotating shaft 7 of this device is arranged so that the surface formed by the leads 12 or 13 becomes a horizontal surface. axis center 15
is used by being attached diagonally to the panel surface of electronic equipment.

[Brief explanation of the drawing]

Figure 1 is a front view showing an example of a conventional device;
The figure is a sectional view taken along the line A--A, FIG. 3 is a perspective view of a portion of an embodiment of the device according to the present invention, and FIG. 4 is a plan view thereof. 1 is a rotating head part, 2 and 3 are fixed guides, 8
9a and 9b are magnetic heads, 12 and 13 are leads, 15 is a connecting portion, 16 is a protruding portion, 1
7 is a through hole.

Claims (1)

[Scope of utility model registration request] A head is attached to the outer periphery of a rotating body such as a rotating disk, and a head is formed on both sides of the rotating body in the direction of extension of the rotational axis so as to form a cylindrical surface centered on the rotational axis or a part thereof, respectively. A pair of fixed guide drums each having a magnetic tape guide surface are provided, and the magnetic tape guide surfaces of the pair of fixed guide drums each have a pair of leads for regulating the traveling width of the magnetic tape guided by the guide surfaces. and a pair of fixed guide drums, the distance between the respective leads is set approximately equal to the width of the magnetic tape, and a connecting portion connecting the pair of fixed guide drums is integrated with the pair of fixed guide drums. A rotary head device consisting of