JPH06195825A - Magnetic head device - Google Patents

Abstract

PURPOSE:To provide a magnetic head capable of improving an azimuth followup ability without deteriorating the automatic azimuth adjusting function. CONSTITUTION:Tape guides 18, 18 are provided at both sides of a magnetic head 1 in the running direction of a magnetic tape 6. The tape guides 18, 18 are provided with guiding parts 18a, 18a to guide the recording/reporducing surfaces of the magnetic tape 6 and control parts 18b, 18b, 18c, 18c at both ends of the guiding parts 18a, 18a in the breadthwise direction of magnetic tape. The guiding parts 18a, 18a and the control parts 18b, 18b, 18c, 18c of the tape guides 18, 18 are provided so as to cover the both ends of the front surface of the magnetic head 1 in the running direction of the magnetic tape 6.

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device incorporated in a cassette tape recorder or the like, and more specifically, to improve the stability of recording / reproducing characteristics with respect to azimuth (hereinafter referred to as azimuth followability). Regarding

2. Description of the Related Art As a magnetic head device used in a conventional cassette tape recorder, those shown in FIGS. 24 and 25 are known. In these figures, a magnetic head 1 is loaded with magnetic cores 3, 3, ... For recording, reproducing, erasing, etc. inside a substantially rectangular parallelepiped box-shaped shield case 2 made of permalloy or the like. 3, ...
Between which the shield plates 4, 4, ... Are interposed, a space inside the shield case 2 is filled with a resin agent, and an electric circuit (not shown) is connected to the lower part thereof. Is. The magnetic tape sliding surface 5 on the upper surface of the magnetic head 1 has a shape that swells in the direction in which the magnetic recording medium (magnetic tape) 6 slides. The magnetic head 1 is fixed to the mount 7. This mount 7
Is formed integrally with a synthetic resin material such as plastic, and has tape guides 8 and 8, a frame body 9 provided below the tape guides 8 and 8, and right and left side portions of the frame body 9. The mounting portions 10 and 10 are provided (the left mounting portion 10 is not shown in FIG. 24). The tape guides 8, 8 are formed at the tape sliding contact portions 8a, 8a for guiding the running of the magnetic tape 6 and at both ends of the tape sliding contact portions 8a, 8a (positions above and below the tape sliding contact portion in FIG. 24). The protrusions 8b, 8b, 8c, 8c are formed. Of these, the protrusions 8b, 8 formed on the upper part
As shown in FIG. 25, the tape sliding contact portions 8a, 8b
Guide surfaces 8d, 8d perpendicular to a are formed. In addition, the protrusions 8c, 8c formed on the lower portions of the tape sliding contact portions 8a, 8a have guide surfaces 8d, 8d of the upper protruding portions 8b, 8b as they extend from the ends of the tape sliding contact portions 8a, 8a. Slopes 8e, 8e are formed which are spaced apart from and are inclined to the tip of the protrusion. Also, the tape sliding contact portion 8
The portions a and 8a are formed in a curved shape so that the magnetic tape 6 can be smoothly brought into sliding contact with each other to reduce the resistance. The mounting portions 10 and 10 are provided with bolt holes 10a and 10a for mounting the magnetic head 1 on a tape recorder or the like (the left bolt hole 10a is not shown in FIG. 24). In order to manufacture the magnetic head device having the above structure, the magnetic head 1 is mounted on the mount 7 by an external special positioning means.
After positioning to the magnetic head 1 with an adhesive such as resin
To the mounting base 7. Then, when recording, reproducing, erasing or the like of the magnetic tape 6 by the tape recorder equipped with the magnetic head device, the magnetic tape 6 slides on the tape sliding surface 5 as shown in FIG. At the same time, the widthwise end 6a of the magnetic tape 6 slides on the inclined surfaces 8e, 8e of the projections 8c, 8c. When the magnetic tape 6 slides on the inclined surfaces 8e, 8e, the magnetic tape 6 is pushed upward and travels while contacting the guide surfaces 8d, 8d of the upper protrusions 8b, 8b. As a result, the magnetic tape 6 is positioned by the upper protrusions 8b and 8b, and travels in a state in which the azimuth adjustment is automatically performed with respect to the gap line 3a on the tape sliding surface 5.

However, the conventional magnetic head device described above has the following problems. That is, the end portions of the magnetic tape 6 in the width direction have the protrusions 8b, 8b.
By sliding on the inclined surfaces 8e, 8e of the magnetic tape 6, the magnetic tape 6 is pushed upward, and the protrusions 8b, 8b on the upper side.
The vehicle runs while contacting the guide surfaces 8d, 8d. Therefore, an excessive load is applied to the magnetic tape 6 and the magnetic tape 6
I was sometimes scratched. Further, the deterioration of the recording / reproducing characteristics due to the deviation of the azimuth is large, and sufficient characteristics may not be obtained when the mounting accuracy is poor. The present invention has been made under such a background, and an object of the present invention is to provide a magnetic head capable of improving the azimuth followability without lowering the automatic azimuth adjusting function.

A magnetic head device according to the present invention is a magnetic head device provided with tape guides on both sides of a magnetic head in a magnetic tape running direction, wherein the tape guide is provided with means for improving azimuth followability. It is characterized by that. Further, tape guides are provided on both sides of the magnetic head in the magnetic tape running direction, and the tape guides are provided with guide portions for guiding the recording / reproducing surface of the magnetic tape and regulating portions for guiding both ends in the width direction of the magnetic tape. In the magnetic head device, the guide portion and the regulation portion of the tape guide are provided so as to cover both ends of the front surface of the magnetic head in the magnetic tape running direction.

According to the magnetic head device of the present invention, since the tape guide is provided with the means for improving the azimuth followability, the output characteristics are hardly deteriorated by the deviation of the azimuth. Further, since the guide portion and the regulation portion of the tape guide are provided so as to cover both ends of the front surface of the magnetic head in the magnetic tape running direction, while the magnetic tape contacts the front surface of the magnetic head from the guide portion on the magnetic tape introduction side, Since a minute step is formed between the front surface of the magnetic head and the guide portion on the magnetic tape lead-out side, a region where the magnetic tape does not contact is formed in the vicinity thereof. Furthermore, the guide portion and / or the regulating portion can position the magnetic head in the front direction.

1 to 3 are views showing a first embodiment of the present invention. In these drawings, the same components as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.
The magnetic head device of the present embodiment is characterized in that it is provided with tape guides 18, 18 on both sides of the magnetic head 1 in the running direction of the magnetic tape 6.
Tape sliding contact part (guide part) that guides the recording / playback surface of
18a, 18a and projections (regulating portions) 18b, 18b, 1 on both ends of the guide portions 18a, 18a in the width direction of the magnetic tape.
8c and 18c. And tape guide 1
8, 18 guide portions 18a, 18a and regulating portion 18b,
18b, 18c and 18c are provided so as to cover both ends of the front surface of the magnetic head 1 in the running direction of the magnetic tape 6. The restriction surfaces 18d and 18d of the restriction portions 18b and 18b and the restriction portion 1
The restriction surfaces 18e and 18e of 8c and 18c are provided perpendicularly to the guide portions 18a and 18a, respectively. Further, the distance between the restriction surfaces 18d, 18d and the restriction surfaces 18e, 18e is configured to be substantially equal to or slightly longer than the widthwise distance of the magnetic tape 6. With such a configuration, since the regulation distance L (FIG. 3) that regulates the width direction of the magnetic tape 6 is longer than that of the conventional example, the running property of the magnetic tape 6 is stabilized. Therefore, even if the azimuth of the magnetic head 1 is slightly deviated, the magnetic recording / reproducing characteristics do not deteriorate. The results of this experiment will be described later.
Further, in this embodiment, the magnetic head 1 has the guide portion 18
a, 18a and / or the restricting portions 18b, 18b, 18c,
The front surface of the magnetic head 1 is positioned by 18c. Furthermore, as shown in FIG. 3, while the magnetic tape 6 contacts the magnetic tape sliding surface 5 of the magnetic head 1 from the guide portion 18a on the magnetic tape introducing side, and the magnetic tape sliding surface 5
Since a minute step is formed between the contact point and the guide portion 18a on the magnetic tape lead-out side, an area (non-contact area) where the magnetic tape does not contact is formed in the vicinity thereof. Therefore, the torque applied to the magnetic tape 6 can be reduced, and the magnetic tape 6 can be less likely to be scratched. Further, the magnetic particles generated from the magnetic tape 6 gather in this non-contact area, so that the magnetic particles are generated by the magnetic core 3.
It is possible to prevent the deterioration of the magnetic recording / reproducing characteristics due to the addition of the magnetic field. Therefore, it is not necessary to form a groove on the magnetic tape sliding surface 5 of the magnetic head 1. 4 and 5 are diagrams showing a second embodiment of the present invention. In these drawings, the same components as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. The magnetic head device of the present embodiment is characterized in that the guide portions 18a, 18a are provided with a plurality of grooves 18f ... In parallel with the running direction of the magnetic tape 6. Further, the magnetic tape sliding contact surfaces of the guide portions 18a, 18a have a curved shape in the width direction of the magnetic tape. This allows
The torque (friction resistance) applied to the magnetic tape 6 can be reduced, and the magnetic tape 6 can be made less likely to be scratched. In the present embodiment, the direction of the groove 18f is parallel to the running direction of the magnetic tape 6, but it need not always be parallel. For example, by providing it obliquely, the magnetic tape 6 is slightly restricted in the width direction. Can be added. Further, the number of the grooves 18f may be any number, and one tape guide 18 may not be provided. Further, the groove may have any shape, such as a hole or a dent. 6 and 7 are the third and fourth embodiments of the present invention, respectively. In these drawings, the same components as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. The feature of the magnetic head device of the present embodiment is that the regulating portion 18b of the tape guide 18 on one side of the magnetic tape running direction and the regulating portion 18b of the tape guide 18 on the other side, and the regulating portion 18c on one side and the regulating portion on the other side. 18 c are integrally formed on the front surface side of the magnetic head 1. With this configuration,
Since the regulation distance L in the width direction of the magnetic tape 6 is longer than that of the conventional example, the running property of the magnetic tape 6 is stabilized. Therefore, even if the azimuth of the magnetic head 1 is slightly deviated, the magnetic recording / reproducing characteristics do not deteriorate. Further, in the fourth embodiment, as shown in FIG.
A plurality of grooves 18g ... Are provided in d and 18e. As a result, the torque applied to the magnetic tape 6 can be reduced, and the magnetic tape 6 can be made less likely to be scratched. Note that the number of the grooves 18g may be any number, and the one regulation surface 18d (or 18e) may not be provided. Further, the groove may have any shape, such as a hole or a dent. 8 and 9 show the fifth and sixth aspects of the present invention, respectively.
It is an example of. In these drawings, the same components as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. The magnetic head device according to the fifth embodiment is characterized in that the tape guides 18 and 18 are provided with recesses 18h on the regulating surfaces 18d and 18d.
18h is provided and the protrusions 1 are formed on the regulation surfaces 18e, 18e.
8i and 18i are provided. At this time, the concave portion 18h and the convex portion 18i provided on one tape guide 18 are provided so as to be substantially opposite to the running direction of the magnetic tape 6. Further, in the magnetic head device of the sixth embodiment, the magnetic tape introduction side end of the regulation surface 18d of the magnetic tape introduction side tape guide 18 and the magnetic tape ejection side end of the regulation surface 18d of the magnetic tape ejection side tape guide 18 are provided. Are provided with convex portions 18j and 18j, respectively, and the magnetic tape introduction side end of the regulation surface 18e of the magnetic tape introduction side tape guide 18 and the regulation surface 18e of the magnetic tape ejection side tape guide 18 are provided.
The magnetic tape lead-out side end of the
8k is provided. With this configuration, the regulation distance in the width direction of the magnetic tape 6 is longer than that of the conventional example,
Further, since the regulation force in the width direction of the magnetic tape 6 is added by the above-mentioned concave portion and convex portion, the running property of the magnetic tape 6 is stabilized. Therefore, even if the azimuth of the magnetic head 1 is slightly deviated, the magnetic recording / reproducing characteristics do not deteriorate. In the fifth embodiment, the magnetic tape introducing side regulating surface 18d has a concave portion 18h, the magnetic tape introducing side regulating surface 18d has a convex portion 18i, and the magnetic tape introducing side regulating surface 18e has a convex portion 18i and a magnetic tape introducing side regulating surface. 18e and recess 18h
May be provided. The same applies to the sixth embodiment.
Further, the concave portions 18h, 18h, the convex portions 18i, 18i, the convex portions 18j, 18j and the concave portions 18k, 18k may have any shape, and may have a substantially triangular shape or a substantially semicircular shape. Any size may be used, but it is preferable that the size is such that the magnetic tape 6 is not damaged. FIG. 10 shows a seventh embodiment of the present invention. In these drawings, the same components as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. The magnetic head device of the present embodiment is characterized in that another tape guide 19 is provided between the tape guides 18 and 18 integrally with the mounting base 7. The restriction portions 19b and 19c of the tape guide 19 are configured to cover at least a part of the magnetic tape width direction end portion on the front surface of the magnetic head 1. The distance between the regulation surface 19d of the regulation portion 19b and the regulation surface 19 of the regulation portion 19c is substantially equal to or slightly longer than the distance in the width direction of the magnetic tape 6. With such a configuration, the widthwise regulation of the magnetic tape 6 can be performed at three places, so that the running property of the magnetic tape 6 is more stable than the conventional example where the regulation is performed at two places. Therefore, even if the azimuth of the magnetic head 1 is slightly deviated, the magnetic recording / reproducing characteristics do not deteriorate. The shape of the restricting portions 19b and 19c of the tape guide 19 of this embodiment is a substantially rectangular flat plate shape, but the shape is not limited to this, and may be a substantially semicircular shape or any other shape. 11 and 12 show the eighth embodiment of the present invention. In these drawings, the same components as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. The feature of the magnetic head device of the present embodiment is that the regulating portions 18b of the tape guides 18, 18 and the regulating surface 1 of the 18b.
Grooves 18l and 18l are provided in 8d and 18d, and the regulation surfaces 18n and 18n of the sub-regulation portions 18m and 18m are shown in FIG.
It is provided on the same plane as the regulation surfaces 18c and 18c as shown in (a), or is provided with a slight step as shown in FIG. 12 (b). With such a structure, since the regulation force in the width direction of the magnetic tape 6 is added, the running property of the magnetic tape 6 is stabilized. Therefore, even if the azimuth of the magnetic head 1 is slightly deviated, the magnetic recording / reproducing characteristics do not deteriorate. 13 to 16 show another embodiment of the present invention. In the magnetic head device of the embodiment shown in FIG. 13, a regulation portion 21 that regulates one side edge of the magnetic tape in the width direction, a regulation portion 22 that regulates the other side edge of the magnetic tape, and the other side edge of the magnetic tape. A restricting portion 23 for restricting and a restricting portion 24 for restricting one side end of the magnetic tape are provided integrally with the mounting base 20, and the restricting portion 22 and the restricting portion 23 of the mounting base 20.
The magnetic head 1 is installed between and. In addition, the regulation section 2
1 and 24 are sized to be inserted into a small window (not shown) of the cassette half. The magnetic head device of the embodiment of FIG. 14 is provided with a restricting portion 25 as shown in FIG. 10 between the restricting portion 22 and the restricting portion 24 in the embodiment of FIG. 13 so as to restrict one end of the magnetic tape. Has been. In the embodiments of FIGS. 13 and 14, whether one side end of the magnetic tape is regulated or the other side end of the magnetic tape is regulated is appropriately combined while considering the balance of the regulation portion in the width direction of the magnetic tape. Is also good. The magnetic head device of the embodiment of FIG. 15 has tape guides 26, 26 provided at both ends of the magnetic head 1.
And tape guides 27, 27, 2 shaped to be inserted into the small window and the large window (not shown) of the cassette half, respectively.
8 and 28 are provided integrally with the mounting base 20. The magnetic head device of the embodiment of FIG. 16 has tape guides 26, 26 provided at both ends of the magnetic head 1 and a tape guide 27 having a shape to be inserted into a small window (not shown) of the cassette half, respectively. 27 is provided integrally with the mounting base 20. Further, the guide portions 27a and 27a of the tape guides 27 and 27 are configured to be inclined in the width direction of the magnetic tape 6. With this configuration, the magnetic tape 6 slides on the tape sliding surface 5, and the end portion 6a in the width direction of the magnetic tape 6 slides on the guide portions 27a and 27a. The magnetic tape 6 is placed on the guide portions 27a, 27a.
Slides, the magnetic tape 6 is pushed upward and travels while contacting the upper regulating portions 27b, 27b. As a result, the magnetic tape 6 is moved to the upper regulating portion 27.
It is possible to run in a state where the azimuth adjustment is automatically performed with respect to the gap line 3a on the tape sliding surface 5 by being positioned by b and 27b. Although the embodiments of the present invention have been described above, it is a matter of course that a plurality of these embodiments may be combined, and one of the restricting surfaces may be an inclined surface as shown in FIG. 25 of the conventional example. Further, in this embodiment, the tape guides on both sides in the magnetic tape running direction have been described, but the tape guides on one side may be implemented. However, it is more effective to apply the present invention to the tape guides on both sides. (Experimental example) In the magnetic head device of the first embodiment of FIG. 1, the output and the phase were measured when the azimuth angle was shifted. It is shown in FIGS. 17 and 18. A regulation distance (guide width) L for regulating the width direction of the magnetic tape 6 (FIG. 3)
Was set to 3 mm. Further, as a comparative example, the same operation was performed for the conventional example shown in FIG. FIG. 19 and FIG.
Shown in. In FIGS. 17 and 19, □ is a left channel in the forward direction of the magnetic tape, + is a right channel in the forward direction,
◇ indicates the left channel in the reverse direction of magnetic tape running, and △ indicates the right channel in the reverse direction. 18 and 20.
In the figure, □ indicates the magnetic tape running forward direction, and + indicates the magnetic tape running backward direction. From FIG. 19, the conventional magnetic head device has a substantially constant output with respect to azimuth deviation in the range of about −0.8 degrees to 0.6 degrees. On the other hand, FIG.
From the magnetic head device of the embodiment of the present invention,
It can be seen that the range is approximately constant within a range of about 1.6 degrees, and that the azimuth following range is wide. Similarly, it can be seen from FIG. 20 that in the conventional example, if the absolute value shifts by 1.0 degree or more, the phase shifts by 100 degrees or more in absolute value. On the other hand, FIG. 18 shows that in the embodiment of the present invention, the absolute value of the phase does not exceed 100 degrees even if the absolute value deviates by 3.0 degrees or more. 21 to 23, the azimuth angle is shifted when the regulation distance (guide width) L (FIG. 3) for regulating the width direction of the magnetic tape 6 in the first embodiment of the present invention is set to 1 mm, 2 mm and 3 mm, respectively. It is a graph which shows the result of having measured the output at the time of standing. 21 to 23,
Represents a left channel in the forward direction of the magnetic tape, + represents a right channel in the forward direction, ◇ represents a left channel in the reverse direction of the magnetic tape running, and Δ represents a right channel in the reverse direction. As you can see from these figures, the longer the guide width,
It can be seen that the following range of azimuth is wide.

According to the magnetic head device of the present invention, since the tape guide is provided with the means for improving the azimuth followability, the output characteristics are hardly deteriorated due to the deviation of the azimuth. Further, since the guide portion and the regulation portion of the tape guide are provided so as to cover both ends of the front surface of the magnetic head in the magnetic tape running direction, while the magnetic tape contacts the front surface of the magnetic head from the guide portion on the magnetic tape introduction side, Since a minute step is formed between the front surface of the magnetic head and the guide portion on the magnetic tape lead-out side, a region where the magnetic tape does not contact is formed in the vicinity thereof. Therefore, the torque applied to the magnetic tape can be reduced, and the magnetic tape can be less likely to be scratched.
Further, since the magnetic particles generated from the magnetic tape gather in this non-contact area, it is possible to prevent the deterioration of the magnetic recording / reproducing characteristics due to the magnetic particles sticking to the magnetic core. Therefore,
It is not necessary to form a groove on the magnetic tape sliding surface of the magnetic head. Furthermore, the guide portion and / or the regulating portion can position the magnetic head in the front direction.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of a magnetic head device of the present invention.

FIG. 2 is a front view showing the tape guide of the first embodiment of the magnetic head device of the present invention.

FIG. 3 is a sectional view showing a first embodiment of a magnetic head device of the present invention.

FIG. 4 is a perspective view showing a second embodiment of the magnetic head device of the present invention.

FIG. 5 is a front view showing a tape guide of a second embodiment of the magnetic head device of the present invention.

FIG. 6 is a perspective view showing a third embodiment of the magnetic head device of the present invention.

FIG. 7 is a perspective view showing a fourth embodiment of the magnetic head device of the present invention.

FIG. 8 is a perspective view showing a fifth embodiment of the magnetic head device of the present invention.

FIG. 9 is a perspective view showing a sixth embodiment of the magnetic head device of the present invention.

FIG. 10 is a perspective view showing a seventh embodiment of the magnetic head device of the present invention.

FIG. 11 is a perspective view showing an eighth embodiment of the magnetic head device of the present invention.

FIG. 12 is a top view showing a tape guide of an eighth embodiment of the magnetic head device of the present invention.

FIG. 13 is a perspective view showing a ninth embodiment of the magnetic head device of the present invention.

FIG. 14 is a perspective view showing a tenth embodiment of a magnetic head device of the present invention.

FIG. 15 is a perspective view showing an eleventh embodiment of a magnetic head device of the present invention.

FIG. 16 is a perspective view showing a twelfth embodiment of a magnetic head device of the present invention.

FIG. 17 is a graph showing the results of output measurement for azimuth shift in the first example of the magnetic head device of the present invention.

FIG. 18 is a graph showing the results of phase measurement for azimuth shift in the first example of the magnetic head device of the present invention.

FIG. 19 is a graph showing the result of output measurement for azimuth deviation in the conventional magnetic head device.

FIG. 20 is a graph showing the result of output measurement for azimuth deviation in the conventional magnetic head device.

FIG. 21 is a graph showing the results of output measurement for azimuth shift in the first example of the magnetic head device of the present invention.

FIG. 22 is a graph showing the results of output measurement for azimuth deviation in the first embodiment of the magnetic head device of the present invention.

FIG. 23 is a graph showing the results of output measurement for azimuth deviation in the first example of the magnetic head device of the present invention.

FIG. 24 is a perspective view showing a conventional magnetic head device.

FIG. 25 is a front view showing a tape guide of a conventional magnetic head device.

[Explanation of symbols]

 1 magnetic head 5 magnetic tape sliding surface 6 magnetic tape 18, 18 tape guide 18a, 18a guide portion 18b, 18b regulating portion 18c, 18c regulating portion 18d, 18d regulating surface 18e, 18e regulating surface

Front page continuation (72) Inventor Akira Otsuki 1-8 Nishigotanda, Shinagawa-ku, Tokyo Alpine Electronics Co., Ltd.

Claims (2)

[Claims] 1. A magnetic head device having tape guides on both sides of a magnetic head in a magnetic tape running direction, wherein the tape guides are provided with means for improving azimuth followability. 2. A tape guide is provided on both sides of the magnetic head in the magnetic tape running direction, and the tape guide includes a guide portion for guiding the recording / reproducing surface of the magnetic tape and a regulating portion for guiding both ends in the width direction of the magnetic tape. In a magnetic head device provided, the guide part and the restriction part of the tape guide are provided so as to cover both ends of the front surface of the magnetic head in the magnetic tape running direction.