JPH0444336B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tape position regulating device for regulating the running position of a magnetic tape relative to a magnetic head with high precision.

In recent years, heads that are capable of high-density recording and reproducing using narrow track widths, such as fixed head multi-track systems, have been developed in recent years. These heads have minute track widths, track pitches, etc., each on the order of several tens of micrometers, and in order to perform high-quality recording and playback, the running position of the magnetic tape on the surface of the fixed head must be adjusted. It is necessary to strictly control the width of the tape to about 10 μm or less, including waviness in the tape width direction (hereinafter referred to as waving).

As means for regulating the running position of the tape, there are a method of regulating the top and bottom in the width direction of the tape, and a method of regulating the position of one edge of the tape. In the former case, the difference between the width of the guide and the width of the tape causes waving, so in the latter case it is possible to regulate the position with higher precision. When regulating the position of one edge of the tape, a regulating surface and a regulating force applying means are required. As means for applying the regulating force, the guide post or the magnetic head itself can be tilted to apply the regulating force by the difference in tension in the width direction of the tape, or a tip with spring force can be used to press one edge of the tape. There are ways to give regulatory power by doing so. The restraining force is the contact pressure between the restraining surface and the tape edge.

If the above-mentioned regulating force is too weak, the tape will tend to lift off from the regulating surface, and if it is too strong, the tape edge sliding on the regulating surface will be damaged or deformed. Therefore, it is necessary to adjust the regulating force to the optimum value for each driving system. Furthermore, even when tape piece position is being regulated, subtle changes in the regulating force change the tape running position on the headgap, causing changes in running characteristics such as tracking and azimuth. Therefore, considering compatibility between devices, the precision of the regulating force must be high. For example, in a running system with a tape width of 1/4 inch, tension of 50 g, and tape speed of 38.1 cm/s, the optimum value of the regulating force is a value of 1 to 2 g. With conventional regulating force applying means, it is difficult to adjust to the above-mentioned optimum value at the beginning of tape running. Furthermore, regulation force fluctuations in the driving system,
Since the regulating force varies depending on the type of tape, differences due to tape deformation, changes in the running system over time, etc., it has been very difficult to maintain a constant and highly accurate regulating force.

The present invention eliminates the above-mentioned conventional drawbacks and provides a magnetic tape position regulating device that enables extremely accurate position regulation. An embodiment of the present invention will be described below with reference to a side view of main parts in FIG. 1 and a perspective view in FIG. 2. 1 is a magnetic tape, 2 is a magnetic head, 3 is a tape piece position regulating surface provided on the upper surface of the tape piece position regulating plate 4, and 5 is a regulating force detection device that detects the tape position regulating force via the tape piece position regulating plate. It is a means.

The magnetic head 2 is tilted forward as shown by arrow A, and due to the difference in tension in the width direction of the magnetic tape, the magnetic tape 1 is pushed down in the downward direction as shown by arrow B, pushing against the tape piece position regulating surface 3. Furthermore, regulatory aspect 3
The closer the magnetic head 2 is to the magnetic head 2, the higher the tracking accuracy will be. Although various methods of detecting the regulating force can be considered, a strain gauge is used here. Tape piece position regulation surface 3
The tape piece position regulating plate 4 is deflected by the force applied thereto, and the output voltage of the strain gauge serving as the regulating force detecting means 5 changes. 13 is a head holding plate, 14 is a reversible motor, 15 is a cam fixed to the drive shaft 16 of the motor 14, 17 is a tension spring, 17a is its fixing pin, and 18 is a head support pin. The magnetic head 2 is rotatable about a head support pin 19 as a fulcrum. By changing the inclination of the magnetic head 2, the difference in tension in the tape width direction changes, and the regulating force on the tape piece position regulating surface 3 can be changed. In addition, magnetic heads 2 and 13 to 18
and constitute a means for imparting regulatory power. The magnetic head 2 can be rotated by various methods, but here it is rotated by a cam 15 and a reversible motor 14.

When the reversible motor 14 is rotated, a cam 15 fixed to the drive shaft 16 rotates. Head holding plate 1
3 is a tension spring 17 attached to a fixing pin 17a.
It is in constant contact with the cam 15, and as the cam 15 rotates, it tilts about the support pin 18 as a fulcrum.

The output voltage of the regulating force detection means 5 is compared with the comparison means 11.
Compared with the voltage E _O corresponding to the regulation force of the standard,
By driving the reversible motor 14 with the control drive means 12 into which the voltage difference is input, the regulating force can be driven to the reference value. Note that if a highly sensitive strain gauge is used to detect the restricting force, a restricting force of about 10 g can be detected with a deflection of 1 μm or less, so it will not affect tracking in any way.

If the support pin 18 is located near the tape piece position regulating surface 3, the change in the absolute height of the tape piece position regulating surface 3 due to the rotation of the magnetic head 2 will be reduced, and the tape running system will impact will be less.

As shown in Fig. 2, the tape piece position regulating surface 3
Since the head 2, which is the regulating force applying means, is located close to the head 2, the efficiency of applying the regulating force is high.

As is clear from the above embodiments, according to the present invention, it is possible to regulate the tape in one direction with an optimal regulating force and to regulate the tape running position with high precision.

In the present invention, since the magnetic head and the regulating surface are integrated, the head gap becomes very close to the regulating surface. With magnetic tape, there is no wobbling in the tape width direction on the regulating surface, but wobbling occurs as you move away from it, so by having the head gap close to the regulating surface, the wobbling of the magnetic tape on the gap can be minimized. can.

Further, the inclination of the magnetic head is utilized as a regulating force applying means. The regulating surface and the regulating force detection means are also integrated with the magnetic head, and therefore, other components such as guide posts are not particularly required in addition to the magnetic head, resulting in a very simple configuration.

Further, since the regulating surface is integrated with and close to the magnetic head serving as the regulating force applying means, the generated regulating force is efficiently applied between the magnetic tape and the regulating surface.

Furthermore, since the mounting height of the magnetic head is the reference for adjusting the running position of the magnetic tape, the relative position to the regulating surface is set with high precision. It is conceivable that the relative position of However, in the present invention, the magnetic head and the regulating surface are tilted together, so that even if the magnetic head is tilted, the relative position with respect to the regulating surface does not change, and therefore the magnetic tape is always kept at a high level with respect to the magnetic head. Since the tape runs on a precisely set regulating surface without shaking due to the application of an appropriate regulating force, highly accurate regulation of the tape running position can be realized.

Furthermore, as shown in Figure 2, if the fulcrum of the rotation of the magnetic head is set near the restriction surface, the absolute height of the restriction surface will not change due to the rotation of the magnetic head, and therefore the magnetic The absolute height at which the tape runs does not change by tilting the magnetic head, and does not affect the surrounding tape running system. In addition, it is possible to stably regulate the tape piece position, automatically adjust the initial regulating force to provide a tape piece position regulating force that does not damage the tape, and to prevent fluctuations in the regulating force in the running system. It is possible to automatically adjust the regulating force to always keep it at a constant value, following differences due to tape types, changes over time in the running system, etc. Therefore, it is possible to always achieve ideal tape piece position regulation, and even in recording and reproducing by narrow track multi-track, it is possible to realize tracking with high precision, which is of high practical value.

[Brief explanation of drawings]

FIG. 1 is a side view of a head portion in one embodiment of the present invention, and FIG. 2 is a perspective view of this embodiment. 1...
...Magnetic tape, 2...Magnetic head, 3...Tape piece position regulating surface, 5...Regulating force detection means, 11...
Comparison means, 12... control drive means, 13... head holding plate.

Claims (1)

[Claims] 1. A tape piece position regulating surface that is provided integrally with the magnetic head and abuts one end of the magnetic tape in the width direction;
A regulating force detecting means for detecting a regulating force between the magnetic tape and the tape piece position regulating surface, the magnetic head is rotatably held, and the detected regulating force causes the magnetic head to A magnetic tape position regulating device, comprising means for controlling the inclination angle of the tape piece position regulating surface. 2. The magnetic tape position regulating device according to claim 1, wherein the center of rotation of the magnetic head is located near the tape piece position regulating surface.