JPH03157854A - Magnetic tape device - Google Patents

Abstract

PURPOSE:To satisfactorily record and reproduce information even at the time of running a magnetic tape at a high speed by adjusting the wrap angle of the magnetic tape to a magnetic head by a wrap angle adjusting means. CONSTITUTION:A device is so constituted that mobile guides 3a and 3b can be controlled in the transverse direction by guide grooves 21a and 21b and can be finely adjusted in the longitudinal direction by means 4a and 4b. Mobile guides 3a and 3b are finely adjusted to accurately adjust the wrap angle of a magnetic tape 50 to magnetic heads 1a and 1b to an optimum value. Consequently, the thickness of the air film formed between magnetic heads and the magnetic tape is adjusted to the minimum at the time of running the magnetic tape at a high speed. Thus, information is satisfactorily recorded and reproduced even at the time of running the magnetic tape at a high speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic tape device17, and particularly to a magnetic tape device that performs recording and reproduction using a magnetic tape and a magnetic head.

[Prior Art] FIG. 4 is a front view showing the configuration around the magnetic head of a conventional magnetic tape device, FIG. 5 is a front view of the magnetic tape device shown in FIG. 4, and FIG. 5 is a right side view of the magnetic tape device shown in FIG. 4. FIG. Referring to FIGS. 4 to 6, the configuration around the magnetic head of a conventional magnetic tape device includes a magnetic head section 100, and a magnetic tape 50 wound around the magnetic head section 100. Angle θa, θ. Wrapping angle setting section 3 for setting
It consists of 00.

The magnetic head unit 100 includes a magnetic head 1a and a magnetic head 1.
b.

The winding angle setting unit 300 includes a guide plotter 131G, 131°, which is the main body of the winding angle setting unit 300, and a guide block mounting screw 132 for mounting the guide block 131G, 131b to a mechanical chassis (not shown). (
1,132h, balls 33a, 3'-3b, and balls 33a for positioning the magnetic tape 50 in the thickness direction fixed to the tip portions of the guide blocks 131α and 131°.

Flanges 34a and 3 are provided at both ends of the magnetic tape 33b for positioning the magnetic tape in the width direction.
4b.

As described above, in the conventional magnetic tape device, the winding angles θQ and θ of the magnetic tape 5o with respect to the magnetic head unit 100 are different. is set by winding angle setting sections 300 disposed at both ends of the magnetic tape 100. This magnetic head section 100
The winding angles θa and θ of the magnetic tape 50 with respect to the winding angles θa and θ. When the magnetic tape 50 is running, the magnetic tape 50 and the magnetic head la
, 1b is first set so that the thickness of the air film formed between the two is minimized. Magnetic head la.

The smaller the air film thickness formed between the magnetic head 1° and the magnetic tape 50, the easier it is for the magnetic head 1Q, 1° to read the information recorded on the magnetic tape 50, and as a result, the reproduced output will be maximized. be. Correspondingly, in the conventional magnetic tape device, the magnetic tape 5 for the magnetic head 1o+1b is
The winding angle setting unit 300 was placed at a preset position such that the winding angle of 0 was the minimum air film thickness.

[Problems to be Solved by the Invention] As described above, in the conventional magnetic tape device, when the magnetic tape 50 runs during information reproduction, the magnetic tape 5
0 and the magnetic head], a, and the magnetic head 1b of the magnetic tape 50 so that the thickness of the air film formed between the
, 1b is set, and the winding (N1 angle setting section 300 was arranged at a predetermined position) in accordance with this. However, the guide block mounting screw 132 (
There is a difference in diameter between 1 and 132b and their screw holes, which may cause an inconvenience in that the mounting position of the winding angle setting section 300 is shifted by the difference in diameter. In such a case, the winding angle of the magnetic tape 50 with respect to the magnetic head la, 1°, will also change in a cohesive manner. Conventionally, when running at a low speed of about 4.75 em/s, a change of this degree (=1 angle) did not have much effect on the reproduction output of the magnetic head.

However, recently the tape speed has increased from 200 to 300c.
When running at high speeds of the order of m/s, minute changes in the winding angle of the magnetic tape with respect to the magnetic head have a large effect on the reproduction output of the magnetic head. When the magnetic tape runs at high speed, the magnetic helad 14+1-b and the magnetic tape 5
This is because the thickness of the air film formed between the magnetic tape 50 and the magnetic head 1° responds sensitively to changes in the winding angle of the magnetic tape 50 with respect to the magnetic head 1°. Therefore, in a conventional magnetic tape device in which there is a possibility that the mounting position of the winding angle setting section 300 may be misaligned, there arises a disadvantage that the reproduction output of the magnetic head varies greatly depending on the mounting position. Furthermore, the shape accuracy of the tip of the magnetic head is several tens of thousands.
There are variations in processing on the order of micrometers. As a result, the optimal mounting position of the winding angle setting part differs depending on each magnetic head, and this causes a problem in that the winding angle of the magnetic tape 50 with respect to the magnetic heads ld+1 and b changes even with -). .

In other words, in conventional magnetic tape devices, due to the difference in diameter between the mounting screw of the winding angle setting unit and its screw hole, @(
-j It has been difficult to set the winding angle of the magnetic tape to the magnetic head at the optimum position due to deviations in the position of the A-1 angle setting section and variations in the shape accuracy of the magnetic head.

As a result, when the magnetic tape is run at high speed, it has been difficult to record and reproduce information favorably.

This invention was made in order to solve the problems mentioned in item 2.It is an object of the present invention to provide a magnetic tape device that can perform good information recording and reproduction even when the magnetic tape runs at high speed. purpose.

[Means for Solving the Problems] A magnetic tape device according to the present invention is characterized in that it includes a winding angle adjusting means for adjusting the winding angle of the magnetic tape with respect to the magnetic head.

[Function] In the magnetic tape device according to the present invention, the winding angle of the magnetic tape with respect to the magnetic head is adjusted by the winding angle adjusting means, so that when the magnetic tape runs at high speed, there is a gap between the magnetic head and the magnetic tape. It can be adjusted to minimize the thickness of the air film formed.

[Embodiment of the Invention] FIG. 1 is a plan view showing the configuration around a magnetic head of a magnetic tape device according to an embodiment of the present invention, and FIG. 2 is a plan view of the magnetic tape device shown in FIG. 1. FIG. 3 is a right side view of the magnetic tape device shown in FIG. 1.

Referring to FIGS. 1 to 3, the magnetic tape device includes a magnetic head section 100 and a winding angle adjustment section 200.

The magnetic head unit] 00 includes magnetic heads 1a and 1b for reproducing information recorded on the magnetic tape 50 and for recording information on the magnetic tape 50.

The winding angle adjustment unit 200 includes a movable guide fixing base 2α+2b for fixing the movable guides 3a and 3°, and movable guide blocks 31a and 3 which become the main bodies of the movable guides 3a and 3b.
1b, and a movable guide 3a.

movable guide fixing screws 32Q, 32b for attaching movable guide fixing base 3b to movable guide fixing bases 2Q, 2°, movable guide 3a,
Balls 33a, 33b for positioning the magnetic tape 50 in the thickness direction fixed to the tip of the ball 3b, and flanges for positioning the magnetic tape in the width direction attached to both ends of the balls 33a, 33b. 34ci
, 34b, and movable guide position adjustment screws 4a, 4b for finely adjusting the longitudinal positions of the movable guides 3Q, 3b attached to the movable guide fixing bases 2Q, 2b.

As shown in FIG. 2, the guide blocks 3Q, 3° to which the balls 33a, 33b and flanges 34a, 34 are fixed are movable guide fixing bases 2a, 2. .

The guide grooves 21α and 21b are fitted into the guide grooves 21α and 21b. The movable guides 3a, 31) are movable guide position adjustment screws 4a, 4b.
By turning , it moves back and forth along the guide grooves 21a, 21°. At this time, if movable guide position adjustment screws 4a, 4b with a pitch of 0.25 mm are used, the amount of movement of movable guide blocks 31a, 31b will be approximately 7 μm for a rotation angle of 10° of movable guide position adjustment screws 4a, 4b. becomes. For example, the distance between the magnetic head 1a and the movable guide 3Q is set to 1.
Assuming 2.5 mm, in the range of θa from 0° to 10″,
It can be seen that the change in the winding + j angle with respect to the movement amount of 7 μm of the movable guides 3Q, 3b is less than 2 minutes (1/30'), and the winding angle can be easily finely adjusted.

Next, referring to FIGS. 1 to 3, the magnetic tape 50
A method of adjusting the winding angle for the magnetic heads IQ and lb will be explained. First, the magnetic tape 50 is run at high speed and the reproduction output by the magnetic head 1a is monitored. Next, while monitoring, the movable guide position adjustment screw 4a is rotated to move the movable guide position adjustment screw 3a back and forth. Thereby, the winding angle of the magnetic tape 50 with respect to the magnetic head 1a is changed to determine the position where the reproduced output by the monitored magnetic head is maximum. The movable guide 3a is moved to this position by the ID fixing screw 32. Fix it by. In this way, one movable guide 3
After adjusting a, the other movable guide 3b is adjusted in the same way.

”-, in this embodiment, the movable guide 3Q.

3b is regulated in the lateral direction by the guide grooves 21a, 21b, and finely adjusted in the front-back direction by 4a, 4b. By finely adjusting the movable guide 13Q-3b, the magnetic head of the magnetic tape 50 is Since the winding angle with respect to 14+1b can be accurately adjusted to the optimum angle, even when the magnetic tape 50 runs at high speed,
It becomes possible to record and reproduce information with good quality. In addition, in this embodiment, when adjusting the position of the movable guides 3a and 3b in the front-rear direction, the movable guide position adjustment screw 4a
, 4b are manually adjusted while looking at the playback output on the monitor, but the present invention is not limited to this. Based on this, the servo motor is rotated to move the movable guide 3a.

Feedback control may be performed to move 3b back and forth. That is, the position of the iiJ moving guide can be automatically adjusted (7).

[Effects of the Invention] As described above, according to the present invention, by adjusting the winding angle of the magnetic tape with respect to the magnetic head by the winding angle adjustment means, the winding angle of the magnetic tape with respect to the magnetic head can be adjusted. The thickness of the air film formed between the magnetic tape and the magnetic tape can be adjusted to the minimum.
Good information recording and reproduction can be performed even when the magnetic tape runs at high speed.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention. The structure of the peripheral part of the magnetic head of the magnetic tape device is shown in 1. 2 is a cross-sectional structure diagram taken along the line A-A of the magnetic tape device shown in FIG. 1, FIG. 3 is a right side view of the magnetic tape device shown in FIG. 1, and FIG. 4 is a conventional one. FIG. 5 is a front view of the magnetic tape device shown in FIG. 4, and FIG. 6 is a right side view of the magnetic tape device shown in FIG. 4. It is a diagram. In the figure, la is a magnetic head, 11) is a magnetic head,
2a is a movable guide fixing base, 2b is a movable guide fixing base, 3
a is a movable guide, 3b is a movable guide, 4a is a movable guide position adjustment screw, 4b is a movable guide position adjustment screw, 210
is a guide groove, 211. is a guide groove, 31. 31b is a movable guide block, 32a is a movable guide fixing screw, 132ゎ is a movable guide fixing screw, 3311 is a ball, 33
b is the ball, 34Q is the flange, 341) is the flange,
50 is a magnetic tape, 100 is a magnetic head section, 200 is a winding angle adjustment section, 300 is a winding angle setting section, θa is a winding angle, θ1. is the winding angle. In addition, in the figure, the same number and No. 6 indicate the same or equivalent parts.

Claims (1)

[Claims] It includes a magnetic head having at least one of an information recording function and an information reproducing function, and a magnetic tape capable of recording predetermined information, and the magnetic tape slides into contact with the magnetic head at a certain winding angle to generate the magnetic material. A magnetic tape device for recording and/or reproducing information on a tape, characterized by comprising a winding angle adjusting means for adjusting the winding angle of the magnetic tape with respect to the magnetic head. , magnetic tape device.