JPH047011B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for efficiently measuring the characteristics of magnetic tapes and magnetic heads used in video tape recorders (VTRs) and the like.

In recent years, as the recording density of VTRs has increased, understanding the characteristics of the magnetic tapes and magnetic heads used has become an extremely important issue. Conventionally, actual VTRs have been mainly used to measure this characteristic, but with this method, since the VTR is of a rotating head type, attaching, removing, and replacing the magnetic head is troublesome and takes a long time. Moreover, it was difficult to find the optimum conditions for the mounting position of the head.

To solve this problem, a fixed head type VTR shown in FIG. 1 may be used. That is, according to the fixed head type VTR, the magnetic head 1 can be easily attached, and the attitude of the magnetic head can be slightly moved, so that the optimum magnetic head attitude can be easily determined. but,
In this method, the magnetic tape 2 is moved at high speed (2 to 7 m/
sec), but when running at such high speeds, there are limits to tape running accuracy, and many problems occur such as running jitter, track deviation, and unstable contact between the magnetic head and magnetic tape. This causes problems and makes it difficult to make accurate measurements, and it also requires a large amount of magnetic tape, making it almost impossible to measure when only a small amount of magnetic tape is available, such as a prototype magnetic tape. There was a drawback that it became close.

The purpose of the present invention is to enable fine movement of a fixed magnetic head so that the optimum magnetic head posture can be easily determined, and to efficiently perform sufficiently stable and accurate measurements using only a small amount of magnetic tape. An object of the present invention is to provide an apparatus for measuring the characteristics of a magnetic tape and a magnetic head.

As shown in FIG. 2, in the present invention, two cylindrical members 3a and 3b each having a magnetic tape 2 wound around the outer periphery are provided with a minute interval 4, and the outer periphery is connected to a supporting member 5.
a and 5b, and the magnetic head 1 is disposed in this interval 4 so as to be able to protrude.Although not shown in this figure, the magnetic head 1 is further provided with a mechanism that can slightly move its position and posture. It is something to do.

Embodiments of the present invention will be described with reference to the drawings. Third
The figure is a top view of the device, FIG. 4 is a side view, and FIG. 5 is a detailed explanatory view of the part to which the magnetic head 1 is attached.

This device is a fine movement device that fixes a cylindrical rotating body 6 around a magnetic tape 2 with the magnetic side facing inside, a rotating pivot part 7 with a built-in motor, and a magnetic head 1, and slightly moves the position and posture of the magnetic head 1. It is roughly divided into 10 parts. The cylindrical rotating body 6 holds the supporting members 5a, 5b with screws 11a, 11b, so as to hold the two cylindrical members 3a, 3b with the interval 4 maintained.
11c and 11d are fixed. Note that in these supporting members 5a and 5b, the tape 2 is attached to the cylindrical member 3.
A gap 12 is provided so as to wrap around the entire circumferences of a and 3b. The cylindrical rotating body 6 is rotated together with a rotating shaft 14 supported by a rotating shaft pivot 13 having a built-in motor. Note that this rotary shaft pivot support 13 is a chassis 15.
to the holder 17 fixed with screws 16a and 16b,
Furthermore, it is fixed with screws 18a and 18b.

The fine movement device section 10 of the magnetic head 1
The X-direction position, Z-direction position, Y-direction position, and θ-direction position are each independently slightly moved. The X direction is for accurately positioning the magnetic head 1 at a distance 4, and the Z direction is for bringing the magnetic head 1 into contact with the magnetic tape 12. The Y direction is for horizontally moving the magnetic head 1, and the O direction is for changing the attitude of the head cap for transmitting video signals to the magnetic tape 2. The structure of this fine movement device section 10 is a base 19, a micrometer 20, a micrometer holder 21, and an X-direction moving table 22.
a Z-direction feed device consisting of a micrometer 23, a micrometer holder 24, and a Z-direction moving table 25; a Y-direction feed device that artificially moves the magnetic head 1 laterally by rotating the shaft 26; The device also consists of a head azimuth fine adjustment mechanism that slightly moves the magnetic head 1 in the θ direction by rotating a shaft 28 to which the mounting plate 27 of the magnetic head 1 is fixed.

These mechanisms are held by supporting the head azimuth fine adjustment mechanism with the shaft 26 of the Y-direction feed device, and supporting the Y-direction feed device on the Z-direction moving table 25 of the Z-direction feed device with screws 29a and 29b. A feeding device is attached to the X-direction moving table 22. Furthermore, the X direction feeding device has a screw 30a on the chassis 15.
Screws 32a and 32 are attached to the holder 31 fixed with 30b.
b to support the entire fine movement device section 10.

By the way, the head azimuth fine adjustment mechanism has a structure in which a mounting plate 27 to which the magnetic head 1 is adhesively fixed is fixed to the shaft 28 with a screw 50, aligned with a head azimuth adjustment table 33, and a stopper 34 is connected with a screw 35. There is. Therefore, the stopper 34 and the magnetic head 1 are rotatable as a unit. The rotation of this stopper 34 is controlled by the screw 36 and the spring 3.
This is done by means of a pin 38 incorporating 7. That is, when rotating the stopper 34, by moving the screw 36, the end portion 3 of the stopper 34 is rotated.
Press 4a to move. Since the pin 38 is constantly pressed against one end 34b of this stopper 34 by the spring 37, this stopper 34
6, and can be held in a set rotational state by a screw 36.

The lateral movement of the magnetic head 1, that is, the movement in the Y direction, is performed by rotating the shaft 26, which rotates together with the head azimuth adjustment table 33. The rotation of the shaft 26 is the third
A screw 40a is attached to the rotation shaft pivot base 39 shown in FIG.
Pin 42, screw 43, and plate 41 fixed with 40b.
It is operated in the same manner as the head azimuth fine adjustment mechanism using the shaft stopper 44 and a spring (not shown).

By the way, when replacing the magnetic head 1, first move it in the Z direction using the micrometer 23, then tighten the screw 4.
5, the screw 45 is separated from the stepped portion 26a provided on the shaft 26, and the shaft 26 is moved in the direction A, whereby the head azimuth fine adjustment mechanism can be pulled out from the cylindrical rotating body 6. Furthermore, since the magnetic tape 2 is fixed to the cylindrical members 3a and 3b with adhesive tape, it can be easily replaced.

The magnetic head 1 described above uses a recording/reproducing head capable of sequentially recording and reproducing data onto the magnetic tape 2. Therefore, recording and reproducing can be performed with just one magnetic head 1, and the above-described device can perform magnetic head 1.
In addition to making it possible to measure the characteristics of the magnetic tape 2 and the characteristics of the magnetic tape 2, it also becomes possible to clarify the optimum position and posture of the magnetic head.

Incidentally, it is also possible to arrange the recording and reproducing magnetic heads separately in the cylindrical rotating body 6. In this case, since recording and reproducing can be performed constantly, there is an advantage that the characteristics of the magnetic head 1 and the magnetic tape 2 can be determined in a short time.

As explained above, in the apparatus of the present invention, the magnetic head and magnetic tape can be easily replaced, and the position and posture of the magnetic head can be finely adjusted. Therefore,
This device can clarify the optimal position and orientation of the magnetic head in a short time, as well as the characteristics of the magnetic tape and magnetic head.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of a conventional magnetic tape head characteristic measuring device, Fig. 2 is a schematic structural view of the main parts of the device of the present invention, Fig. 3 is a top view of the device, and Fig. 4 is a side view of the device. 5 are explanatory diagrams of the structure of the magnetic head mounting portion. 1...Magnetic head, 2...Magnetic tape, 3...
Cylindrical member, 5... Support member, 6... Cylindrical rotating body, 7... Rotating pivot portion, 10... Fine movement device section.

Claims (1)

[Claims] 1 Two coaxial cylindrical members are placed apart in the axial direction of the central axis to provide a gap, a magnetic tape is wound and arranged so as to span these two cylindrical members, and the cylindrical members are rotated. A magnetic head fixed by a support member is placed between the two cylindrical members, and the support member rotates the magnetic head with respect to an axis parallel to and perpendicular to the central axes of the two cylindrical members. 1. An apparatus for measuring characteristics of magnetic tapes and magnetic heads, characterized by having a fine movement device that moves in a direction or rotates around an axis.