JPS5827570B2 - magnetic head device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is used in a tape device in which a large number of recording tracks are formed in the width direction of the tape, and a head is moved in the width direction of the tape to perform recording and reproduction of, for example, a video signal on any track. The present invention relates to a magnetic head device.

For example, it has been considered to use an endless tape device as a means for recording and reproducing video signals using a head mechanism whose position is fixed.

That is, the recording/reproducing head in the head mechanism is set by changing its position with respect to the width direction of the running tape, so that a large number of recording tracks are set in the tape width direction. The track is moved one step in the width direction for each round, so that the large number of tracks described above are continuous.

When constructing a video tape recorder using such an endless tape device, for example, as many as 300 tracks are formed in the width direction of the tape, and the tape length is set to 100 meters or more, so that video signals can be recorded for a sufficiently long time. I try to do that.

FIG. 1 shows an example of the configuration of such an endless tape device, in which an endless tape 11 is stored by being wound around the outer periphery of a fixed reel 12 formed into an annular shape.

The fixed reel 12 is formed with a tape draw-out window 13 that communicates with the inner and outer circumferences of the fixed reel 12, and the wound tape 1
The inner peripheral part of the reel 1 is pulled out to the inner peripheral part of the reel 12.

The tape 11 pulled out to the inner peripheral part of the fixed reel 12 is
■It contacts the head mechanism 16 set between the pair of guide columns 14 and 15, and the capstan 17 and the pinch roller 1
It is driven to run by a tape drive mechanism consisting of 8.

Then, the tape 1 sent out from this tape drive mechanism
Although not shown in the figure, 1 is connected to the reel 12 via a guide mechanism.
The material is guided to the outer periphery of the material and is wound up.

Here, the tape 11 that is driven to run as described above is
In the head mechanism 16, the running of the tape is controlled by the flanges 14a, 14b and 15a, 15b on both sides of the guide columns 14 and 15, so that the position in the tape width direction, that is, the height direction, is regulated with high precision.

The head mechanism 16 also includes a cylindrical tape guide 19 that extends in the width direction of the tape to which the tape 11 running between the guide columns 14 and 15 is pressed, and a through hole is formed in the head guide 19. The recording/reproducing head 20 is configured to protrude from this through hole.

The tape guide 19 and the head 20 are integrally controlled to move in the width direction of the tape 11 as shown by arrows in the figure.

For example, the head mounting base on which the head 20 is attached together with the head guide 19 is set to be moved by a screw shaft in the direction of the arrow above, and the screw shaft is rotated and driven by controlling the rotation angle with a pulse motor to mount the head. The base is configured to be driven in minute steps.

That is, the head guide 19 and the head 20 are moved in specified minute steps with respect to the tape 11 whose widthwise position is regulated by the guide columns 14 and 15.
As the tape 11 runs, a large number of recording tracks are formed in the width direction of the tape 11, and these tracks are reproduced.

FIG. 2 shows the running tape 11 in the head mechanism 16 section.
A shows the relationship between the head 20 and the tape 11.
B shows the state of contacting the lower edge of , B shows the state of contacting the center part, and C shows the state of contacting the upper edge.

Here, the tip end portion of the recording/reproducing head 20 is attached to the mounting base 21 in a state of protruding slightly by X from the guide surface of the tape guide 19.
It is pressed into contact with the material in a state where it is pushed out and deformed in a protruding manner.

Therefore, with respect to the normal running path of the tape 11 shown by the chain line in the figure, a force acts on the tape 11 upward in case A and downward in case C, and this force causes the tape 11 to connect with the head 20. A deflection E occurs at the contact point.

The magnitude of this deviation E is determined by the tape 11 of the tape guide 19.
It changes depending on the inclination with respect to the running surface and the amount of protrusion of the head 20.

That is, even if the recording/reproducing head 20 is controlled to move in the width direction of the tape 11 by an accurate step amount, the head 2
At the contact point between the tape 11 and the head 20, the head 20 is moved with the deviation E added to or subtracted from the tape 11, and a large number of records are recorded on the tape 11 at an accurate pitch. It becomes impossible to form tracks.

For example, in the width direction of the tape 11 with a width of % inch, 3
When as many as 00 recording tracks are formed, this poses a very serious problem in terms of tracking control.

In particular, there are errors in the inclination of the tape guide 19 and the amount of protrusion of the head 20 between tape machines.
This also poses a major problem in terms of tape compatibility.

For this reason, it is necessary to avoid forming recording tracks to the side edges of the tape 11 so that the amount of deviation E is within a small range, which makes it easier to use the limited tape width effectively. It is.

The present invention has been made in view of the above points, and is designed to eliminate deviation in the width direction of the running tape in the head mechanism section, especially in the recording/reproducing head contact section, and to prevent the tape from shifting in the width direction in response to the movement of the head. It is an object of the present invention to provide a magnetic head device for use in a fixed head tape device in which a head contact portion is moved at a precise track pitch and accurate recording and reproduction patterns can be obtained.

the inclination of the tape guide 19 with respect to the running tape surface;
The relationship with the amount of deviation E is as shown in FIG.

In this figure, curves a, b, and c respectively correspond to the head positions corresponding to A-C in FIG. As the head 20 moves, the deviation E becomes "3.+
Changes with +C and J.

Also, if the tape guide 19 has an inclination X,
a2-→C2".

Therefore, the cumulative pitch of the track pattern on the tape accompanied by this deviation E occurs as an error, and this error changes depending on the inclination of the tape guide 19. Even if the head feeding mechanism is highly accurate, , tape compatibility becomes difficult.

Therefore, in this invention, "a3←" in FIG.
→C3" and "a4←+C4", the inclination angle of the tape guide can be variably set as the head moves in the width direction of the running tape.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 shows a cross section of the head mechanism 16. The recording/reproducing head 20 is provided integrally with a base 21, and this head base 21 is fixed to a head mounting base 22 by tightening screws 23. has been done.

The mounting base 22 is controlled to move as indicated by an arrow 24 in the figure by a screw shaft mechanism whose rotation is controlled by a pulse motor (not shown).

Further, the tape guide 19, on which the running tape 11 runs in pressure contact, is attached to the mounting base 22 by a plate spring 25, and the elasticity of the plate spring 25 allows the tape
It is supported so as to be tiltable as shown by an arrow 26 on a surface perpendicular to the surface of the tape 11 in the width direction of the tape 1 .

Particularly in this embodiment, the elastic force of the plate spring 25 is applied so that the lower end of the tape guide 19 is biased in the direction of the surface where the tape 11 is present.

A holder 27 is attached to the lower edge of the tape guide 19.
The vibrator 28 is mounted so as to face the biasing direction of the leaf spring 25, and the vibrator 28 is brought into contact with the guide rod 29.

This guide rod 29 is attached to a block 30 that is fixedly set, and this block 30 is provided with slots 31 in the horizontal direction. The rod 29 is configured such that its upper end is inclined in a direction away from the surface of the tape guide 19, as shown in the figure.

The angle of inclination can be variably adjusted using an adjustment screw 32.

That is, in the head device configured as described above, the mounting base 22 is attached to the tape 11 as shown by the arrow 24.
When the base 22 is moved in the width direction of the tape guide 19, the vibrator 28 attached to the tape guide 19 moves to the position shown at 283 in the figure. It will now move to the position shown.

Therefore, the tape 11 on which the recording/reproducing head 20 runs
When the tape guide 19 is in contact with the lower edge, the center portion, and the upper edge of the tape guide 19, the tape guide 19 is tilted as shown in A to C in FIG. 5, respectively.

That is, the tape guide 19 is tilted in a direction that cancels out the deviation caused by the contact pressure of the head 20 with respect to the tape 11, and even if the contact position of the head 20 changes, the tape 11 will not move as shown by the chain line in FIG. FL so that it is maintained in the normal position shown.

Therefore, the contact position of the head 20 on the tape 11 surface is changed in steps according to the moving pitch of the head mounting base 22, forming an accurate track pattern on the tape 11, and reproducing this in an accurate tracking state. It is something that you will get.

In this case, if the tape height position by the guide column that guides the tape 11 while traveling and the reference position of the head 20 in the head mechanism are accurate, the head 20 can move the tape 11
The surface of the tape guide 19 may be a vertical surface that coincides with the tape running surface in the state shown in FIG.

However, if there is an error in the reference height position of the head 20, for example, the head 20 may be set so that it accurately traces the center of the tape 11 in the width direction in the state shown in B in FIG.
The inclination angle of the tape guide 19 may be set as a reference.

That is, the operation shown by ra4←→C4J in FIG. 3 may be performed.

This adjustment is performed, for example, in the holder 28 of the vibrator 28.
The connection portion with the tape guide 19 may be adjusted.

In addition, the amount of protrusion of the head 20 from the tape guide 19 surface,
The amount of deviation E described above may differ depending on other conditions.

Therefore, it is necessary to adjust the range of change in the amount of inclination of the tape guide 19 depending on the state of the amount of deviation E, and this can be done by the adjustment screw 32.

This adjustment can be carried out by running a master tape on which an accurate f, f + - rack pattern is formed, so that accurate head tracking can be achieved, for example, in the conditions A to C in Fig. 5. be.

Incidentally, in the embodiment, the tilting control of the tape guide 19 is performed by the guide rod 29 on the fixed side, but the structure of the guide rod 29 whose inclination is set may also be attached to the tape guide 19 side. Of course.

As described above, according to the present invention, it is possible to reliably eliminate the deviation in the width direction of the tape due to the change of the head contact position in the tape width direction by tilting the tape guide. Even when a large number of recording tracks are formed by effective use, tracking control can be performed reliably on all tracks, and at the same time, tape compatibility can be guaranteed.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view illustrating the tape mechanism related to the present invention, FIG. 2 is a diagram illustrating the relationship between the head mechanism and the tape in the tape machine, and FIG. A curve diagram showing the relationship between the guide inclination and tape deflection in the head mechanism in correspondence with the head contact position, FIG. 4 is a cross-sectional configuration diagram showing a head device according to an embodiment of the present invention, and FIG. A-C are diagrams illustrating tape guide control states in the head device. 11...Tape, 14.15...Guide column, 16...Head mechanism, 19...
Tape guide, 20... Recording/playback head, 22
......Mounting base, 25...Plate spring, 2
8...Kiko, 29...Guidance pole, 30
...Block, 32...Adjustment screw.

Claims (1)

[Scope of Claims] 1. A head mounting body to which a recording/reproducing head is attached and controls the movement in the width direction of the running tape so as to bring the head into contact with different positions in the width direction of the tape, and a head mounting body to which the running tape is guided by pressure. A tape guide in which the head is set to protrude from the guide surface, a spring mechanism for attaching the tape guide to the mounting body so as to be tiltable in a plane in the width direction of the tape, and a spring mechanism that allows the tape guide to be tilted in a plane in the tape width direction with respect to the mounting body; The tape guide is provided with a guide mechanism for tilting the tape guide with respect to a surface extending in the tape width direction, and the tape guide is tilted and controlled so that the tape side end direction in contact with the head protrudes in the tape pressure contact direction. A magnetic head device featuring: 2. The guide mechanism is such that the tape guide is set parallel to the tape surface in a state where the head is in contact with the central portion in the tape width direction, and the inclination direction is reversed on both sides of the tape guide. The device according to item 1. 3. The device according to claim 1, wherein the inclination angle of the guide mechanism is adjustable.