JP2896745B2 - Magnetic head device and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device most suitable for, for example, a cassette tape recorder and the like, and a magnetic head device for guiding a magnetic tape to a magnetic head in an accurate positional relationship for recording / reproducing, and manufacturing thereof. It is about the method.

[0002]

2. Description of the Related Art Conventionally, in this type of magnetic head device, it was necessary to adjust the azimuth of the magnetic head with respect to the running of the tape. Magnetic head devices have been proposed.

FIG. 8 is a perspective view showing a magnetic head device to which the technique described in the above publication is applied. This magnetic head device includes a head mount 102 on which a magnetic head 101 is mounted.
A pair of inner tape guides 103 that regulate the running of the tape 105 on both sides of the magnetic head 101, and a pair of outer tape guides 104 that regulate the running of the tape 105 on both outer sides of the tape guides 103. It is formed integrally with a synthetic resin.

According to this configuration, since the four tape guide portions 103 and 104 are integrated with the head mount 102, the tape 1 at the tape guide portions 103 and 104
05 is correctly regulated, and azimuth adjustment is substantially unnecessary.

[0005]

By the way, in the magnetic head device which does not require azimuth adjustment as described above, the tape position regulating surfaces 103a and 104a of the four tape guide portions 103 and 104 are particularly arranged in a straight line. It is extremely important to guide the tape running by uniformly contacting the edge of the running tape 105 without excess or shortage. For example, when one of the tape guide portions 103 and 104 is displaced and the straightness is deteriorated, the edge of the tape 105 concentrates on the tape position regulating surface 103a or 104a of the displaced tape guide portion 103 or 104. And the effect of regulating the position of the tape running is weakened.

In this respect, in the above conventional example,
Since the four tape guides 103 and 104 are integrally formed of a synthetic resin, the dimensions vary from one molding lot to another, and the dimensional accuracy is not very good. In particular,
It is difficult to keep the width between the tape position regulating surfaces 103a and 104a affecting the running stability of the tape 105 and the straightness, which is the relative positional accuracy of the four tape guide portions 103 and 104, with high accuracy and constant. there were.

In addition, since the tape guide portions 103 and 104 are shrunk and expanded due to a change in the use environment temperature due to the synthetic resin, the guide width and straightness are deviated, and the tape running position is not stabilized. Failure occurs. In order to avoid these problems, it is necessary to use a synthetic resin having relatively excellent dimensional stability, and there is a problem that it is expensive. But,
Nevertheless, the dimensional stability was not always sufficient.

Further, the tape guide portions 103 and 104 formed of synthetic resin easily drop off the magnetic powder of the tape 105 particularly in a high temperature environment, and the magnetic powder adheres to the tape running surface of the magnetic head 101, Head 10
In some cases, the reproduction sensitivity of Sample No. 1 was significantly reduced. In addition, the magnetic powder that has fallen from the tape 105 is particularly likely to adhere to the tape guide portions 103 and 104 formed of synthetic resin, and the adhered magnetic powder becomes sticky, increasing the friction with the running tape 105. In some cases, tape running became difficult.

Accordingly, the present invention provides a magnetic head device which improves the dimensional accuracy of the tape guide portion, is excellent in thermal dimensional stability, has little adhesion of tape magnetic powder, is of good quality, and is inexpensive, and a method of manufacturing the same. The purpose is to do.

[0010]

According to the present invention, there is provided a magnetic head device comprising: a head mounting portion on which a magnetic head is mounted; a pair of inner tape guide portions for restricting a tape from running at a position sandwiching the magnetic head; A magnetic head device in which a pair of outer tape guide portions that regulate the running of the tape at a position outside the inner tape guide portion are integrally formed by a metal plate; An inner tape guide portion is formed, and outer tape guide portions are formed at both ends of the metal plate, respectively, and the pair of inner tape guide portions are cut and raised, and the pair of outer tape guide portions are connected to the pair of inner tape guides. It is arranged to be opposed by bending in the same direction as the part.

The magnetic head device of the present invention has a head mounting portion on which the magnetic head is mounted, and a tape position regulating portion,
A pair of inner tape guides for regulating the running of the tape at a position on the tape running surface of the magnetic head, a tape sliding surface and a tape position regulating unit, and a tape at a position outside the inner tape guide; A pair of outer tape guides that regulate travel of the magnetic head device are integrally formed by a metal plate, wherein the pair of inner tape guides is formed inside one metal plate; Outer tape guide portions are formed at both ends of the plate, respectively, and the pair of inner tape guide portions are cut and raised, and the pair of outer tape guide portions are opposed to each other by being bent in the same direction as the pair of inner tape guide portions. Are located.

In one embodiment of the magnetic head device of the present invention, the tape position regulating portion of the inner tape guide portion is formed at a tip portion formed by further bending the inner tape guide portion formed by bending. The tape sliding surface and the tape position regulating portion of the outer tape guide portion are formed at a tip portion formed by further bending the outer tape guide portion formed by bending.

In one embodiment of the magnetic head device of the present invention, a pair of tape position regulating portions of the inner tape guide portion are provided so as to face each other with a gap in which the tape runs, and an end surface formed by cutting a metal plate. The tape position restricting portion of the outer tape guide portion is an embossed projection formed by punching from the tape sliding surface.

In one embodiment of the magnetic head device of the present invention, the tape sliding surface of the outer tape guide portion is an R surface.

A method of manufacturing a magnetic head device according to the present invention includes a head mounting portion on which a magnetic head is mounted and a tape position regulating portion at a position on the tape traveling surface of the magnetic head to regulate the running of the tape. An inner tape guide portion and an outer tape guide portion having a tape sliding surface and a tape position regulating portion at a position outside the inner tape guide portion to regulate the running of the tape are integrally formed by a metal plate. A method of manufacturing a magnetic head device, wherein the head mounting portion, the inner tape guide portion, and the tape sliding surface of the outer tape guide portion are formed by bending a metal plate.
After forming into a predetermined shape, the tape position regulating portion of the inner tape guide portion and the tape position regulating portion of the outer tape guide portion are simultaneously formed.

In one embodiment of the method for manufacturing a magnetic head device according to the present invention, an end surface of the tape position regulating portion is formed by cutting an excess piece of the inner tape guide portion, and the tape of the outer tape guide portion is formed at the same time. The embossed protrusion of the tape position regulating portion is formed by the ejection from the sliding surface.

[0017]

According to the present invention constructed as described above, of the tape guide portions for regulating the running of the tape, for the outer tape guide portion, the tape sliding surface is bent into, for example, an R-shape, and the tape slide is formed. A tape position regulating portion formed of, for example, an embossed projection is formed on the moving surface at approximately the same position as the tape width by punching. Then, the inner tape guide portion is bent on the tape running surface of the magnetic head, and a tape position regulating portion formed of, for example, a cut section of the surplus piece is formed in the tape guide portion. As a result, the tape position restricting portion of the inner tape guide portion and the tape position restricting portion of the outer tape guide portion can be pressed simultaneously. The tape position regulating portions of the tape guide portions can be arranged in a straight line, that is, the straightness of the tape position regulating portions of the respective tape guide portions can be improved. Further, since the tape position regulating portion can be extended in parallel with the running direction of the tape, it is possible to secure a sufficient contact portion between the tape position regulating portion and the tape. Further, since the adjacent inner tape guide and outer tape guide are arranged to face each other by bending in the same direction, the inner tape guide and the outer tape guide can be integrally formed from one piece of metal, and,
It is possible to reduce the area of a metal plate as a material.

Further, by forming the tape guide portion into a shape capable of being pressed, and using a metal plate, even if the temperature environment changes, there is little thermal expansion and contraction, and the dimensions can be stabilized. Become like Further, since the magnetic powder of the tape generally does not easily adhere to the metal surface, stable tape running can be obtained.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a magnetic head device and a method of manufacturing the same according to the present invention will be described below with reference to FIGS.

FIG. 1 is a perspective view of a magnetic head device, and FIGS. 2A, 2B and 2C are a plan view, a front view and a side view of the magnetic head device. This magnetic head device includes a tape guide member 2 on which a magnetic head 1 is mounted and which controls tape running. The tape guide member 2 is formed of a metal plate. In this embodiment, a non-magnetic stainless steel plate is used. Tape guide member 2
Are head mounting portions 25 and 26 to which the magnetic head 1 is mounted.
And the inner tape guide portions 21a and 21b, 22a and 22b, and the outer tape guide portions 23 and 24 are integrally formed.

Inner tape guide portions 21a and 21b, 2
2a and 22b are the tape running surface 11 of the magnetic head 1,
The tape is bent so as to protrude above the tape running surface 12 and is in close contact with the tape running surfaces 11 and 12. The inner tape guide portions 21a and 21b, 22a and 22b are provided with tape position regulating portions 21a 'and 21 formed of opposing cut end surfaces.
b ', 22a' and 22b ', and these tape position regulating portions 21a' and 21b ', 22a' and 22b.
The width B of b 'is substantially equal to the width of the tape 5, and B = 3.7
8 to 3.84 mm.

The outer guides 23 and 24 have tape sliding surfaces 23c and 24c bent in an arc shape (R shape).
Tape position restricting portions 23a and 23 composed of embossed protrusions projected from these tape sliding surfaces 23c and 24c.
b, 24a and 24b. The distance between the tape position regulating portions 23a and 23b, 24a and 24b is approximately equal to the width of the tape 5, B is 3.78 to 3.84 mm, and the height H is 0.3 to 0.6 mm. .

In a magnetic head device that does not require azimuth adjustment, a tape 5 having a width dimension of 3.76 to 3.81 mm is used.
The four tape position regulating parts 21a 'and 21
b ', 22a' and 22b ', 23a and 23b, 24
a and 24b each have a width dimension of 3.78 to 3.84.
mm and the difference between their widths is 0.02
mm, and four pairs of tape position regulating portions 21
a 'and 21b', 22a 'and 22b', 23a and 23b, 24a and 24b, each connecting one side in the tape width direction, in the drawing, the line A is as straight as possible, that is, the straightness of the A line Is 0.01
mm or less.

Next, a method of manufacturing the magnetic head device of the present embodiment configured as described above will be described in more detail with reference to FIGS.

First, FIG. 3 is an exploded front view of the tape guide member in a press-punched state. The outer shape of the tape guide member 2 is punched out by pressing a flat metal plate, and the openings 27, slits 28a and 28b, and slits 29 and 30 are formed. In this manner, portions to be the head support portions 25 and 26, the inner tape guide portions 21a and 21b, 22a and 22b, and the outer tape guide portions 23 and 24 are defined in a process described later.

Next, FIG. 4 is a perspective view showing a state in which the tape guide member is bent, and FIGS. 5A, 5B and 5C are a plan view, a front view and a side view of the tape guide member. FIG. As shown in FIGS. 3 and 4, in the tape guide member 2, the head support portions 25 and 26 are arranged such that the inner tape guide portions 21 a and 21 b, 22 a and 22 b at the front end face the front, and the inner tape guide portions 21 a and Bending is performed so that 21b, 22a and 22b face inward, and at the same time, bending is performed so that the tape sliding surfaces 23c and 24c of the outer tape guides 23 and 24 are formed in an arc shape.

Here, the inner tape guide portions 21a and 21a
1b, 22a and 22b are provided with extra pieces in the tape width direction with respect to the tape running restricting portions 21a 'and 21b', 22a 'and 22b' shown by phantom lines, and the width B 'is larger than the tape width. Is also narrow, about 3.2 mm. This surplus piece is added in advance in the state of FIG. And, the tape position regulating portions are not yet formed on the tape sliding surfaces 23c, 24c of the outer tape guide portions 23, 24.

FIG. 6 is a perspective view showing a state in which the tape guide member has been embossed and cut.
(A), (b) and (c) are a plan view, a front view and a side view of the tape guide member. Inner tape guide 2
Excessive pieces of 1a and 21b, 22a and 22b are cut (shaved), and a tape position regulating section 2 composed of end faces thereof is formed.
1a 'and 21b', 22a 'and 22b'. Further, the tape sliding surfaces 23c and 24c of the outer tape guide portions 23 and 24 are punched out (embossed), and the tape position regulating portions 23a and 23b formed of emboss protrusions are formed.
24a and 24b are formed.

At this time, the inner tape guide portions 21a and 21a
Since 1b, 22a and 22b are bent inward, the tape position regulating portions 21a 'and 21b' and 22a '
And 22b 'and the tape position regulating portion 23
The embossing of a and 23b, 24a and 24b is
The same process can be performed by the same punch and die that are moved in the front and back directions of the tape guide member 2. As a result, variations in dimensions due to the bending process in the previous process can be ignored, and the four tape position regulating portions 21a 'can be ignored.
And 21b ', 22a' and 22b ', 23a and 23
The width B and the straightness A of b, 24a and 24b can be finished with extremely high precision.

Next, as shown in FIGS. 1 and 2, the magnetic head 1 is mounted between the head support portions 25 and 26. In this case, press fitting, fixing with an adhesive, fixing with a screw, or the like can be used.

Then, the mounting plate 3 is detachably fixed to the magnetic head 1, and the magnetic head device is mounted on the mechanical deck of the tape recorder via the mounting plate 3.

In the conventional magnetic head device which does not require azimuth adjustment shown in FIG. 8, a mounting portion 106 for mounting the device on a mechanical deck is formed integrally with the head mounting base 102 and the tape guide portions 103 and 104. Was.
For this reason, when the type of the tape recorder changes and the mounting method changes, it is necessary to newly make the entire tape guide, which has been expensive.

On the other hand, in the magnetic head device of this embodiment, in particular, the mounting plate 3 is separated from the tape guide member 2 and is detachably fixed to the magnetic head 1, so that it can be mounted on different types of mechanical decks. Even when the tape guide member 2 is mounted, only the mounting plate 3 needs to be changed, and there is no need to change the entire tape guide member 2. The mounting plate 3 can be formed integrally with the tape guide member 2.

As described above, according to the magnetic head device of the present embodiment, the tape position regulating portions 21a ', 21b', 22a 'of the inner tape guide portions 21a and 21b, 22a and 22b are formed by processing the metal plate. And 22b '
And the width B between the tape position regulating portions 23a and 23b, 24a and 24b of the outer tape guide portions 23 and 24.
And the straightness A can be formed with extremely high precision. Further, the metal plate has a small thermal expansion and shrinkage even when the temperature environment changes, and can stabilize the dimensions. This makes it possible to regulate the running of the tape 5 with extremely high precision.

The structure in which the inner tape guides 21a and 21b, 22a and 22b are bent on the tape running surfaces 11 and 12 of the magnetic head 1 as in the present embodiment, in particular,
Since the regulation of the running of the tape 5 can be performed at a position near the gap of the magnetic head 1, the regulation accuracy can be further improved.

Furthermore, in this embodiment, since the tape sliding surfaces 23c and 24c of the outer tape guide portions 23 and 24 are R-shaped, the magnetic powder of the tape 5 is hard to fall off. The tape hardly adheres to the metal surface, so that stable tape running can be obtained.

In the above-described embodiment, a case has been described in which a pair of inner tape guides and an outer tape guide are provided on both sides of the magnetic head. However, a structure in which the inner tape guide and the outer tape guide are provided on one side of the magnetic head is described. It may be.

[0038]

As described above, according to the present invention,
By forming the inner tape guide portion and the outer tape guide portion integrally with a metal plate, particularly preferably, by positioning the inner tape guide portion on the tape running surface of the magnetic head, the tape position of the inner tape guide portion is reduced. The restricting portion and the tape position restricting portion of the outer tape guide portion can be processed simultaneously. Further, in this case, by bending the adjacent inner tape guide and outer tape guide in the same direction, the inner tape guide portion and the outer tape guide portion can be integrally formed from one sheet of metal, and It is possible to reduce the area of a metal plate as a material. As a result, it is possible to improve the dimensional accuracy such as the width and the straightness of the tape position regulating portion, and to provide a high-quality magnetic head device which is excellent in thermal dimensional stability, has less adhesion of magnetic powder, and is inexpensive. Will be able to do it.

[Brief description of the drawings]

FIG. 1 is a perspective view of a magnetic head device according to an embodiment of the present invention.

FIG. 2 shows the magnetic head device, (a) is a plan view,
(B) is a front view, (c) is a side view.

FIG. 3 is an exploded front view of the metal head tape guide member in the magnetic head device in a press punched state.

FIG. 4 is a perspective view showing a state in which the metal plate tape guide member is subjected to a bending process.

5A and 5B show the metal plate tape guide member, wherein FIG. 5A is a plan view, FIG. 5B is a front view, and FIG. 5C is a side view.

FIG. 6 is a perspective view showing a state in which the metal plate tape guide member has been subjected to a punching process and a cutting process.

7A and 7B show the metal plate tape guide member, wherein FIG. 7A is a plan view, FIG. 7B is a front view, and FIG. 7C is a side view.

FIG. 8 is a perspective view showing a conventional magnetic head device that does not require azimuth adjustment.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Magnetic head 11, 12 Tape running surface 2 Metal plate tape guide member 21a, 21b, 22a, 22b Inner tape guide part 21a ', 21b', 22a ', 22b' Tape position regulating part 23, 24 Outer tape guide 23a, 23b , 24a, 24b Tape position regulating portion 23c, 24c Tape sliding surface 25, 26 Head support portion 27 Opening 28a, 28b 29, 30 Slit 3 Mounting plate 5 Tape

Claims (7)

(57) [Claims] A head mounting portion on which a magnetic head is mounted, a pair of inner tape guide portions for regulating the running of the tape at a position sandwiching the magnetic head, and a tape outside at a position outside the inner tape guide portion. A magnetic head device in which a pair of outer tape guide portions for regulating traveling are integrally formed by a metal plate, wherein the pair of inner tape guide portions are formed inside one metal plate, and the metal plate Outer tape guide portions are formed at both ends of the pair, and the pair of inner tape guide portions are cut and raised, and the pair of outer tape guide portions are arranged so as to face each other by being bent in the same direction as the pair of inner tape guide portions. A magnetic head device characterized by being performed. A pair of inner tape guides having a head mounting portion on which the magnetic head is mounted, a tape position restricting portion, and restricting tape running at a position on the tape running surface of the magnetic head; A magnetic head device having a sliding surface and a tape position regulating portion, and a pair of outer tape guide portions for regulating the running of the tape at a position outside the inner tape guide portion, which are integrally formed by a metal plate. Wherein the pair of inner tape guides are formed inside one metal plate, outer tape guides are formed at both ends of the metal plate, and the pair of inner tape guides are cut and raised. A magnetic head device, wherein a pair of outer tape guides are arranged to be opposed by bending the pair of inner tape guides in the same direction as the pair of inner tape guides. 3. The tape position regulating portion of the inner tape guide portion is formed at a further bent end portion of the bent inner tape guide portion, and a tape sliding surface of the outer tape guide portion. 3. The magnetic head device according to claim 2, wherein the tape position regulating portion is formed at a tip portion formed by further bending the outer tape guide portion formed by bending. 4. A tape position regulating portion of the inner tape guide portion is provided in a pair so as to be opposed to each other with a gap in which the tape runs, and is formed by an end face obtained by cutting a metal plate. 4. The magnetic head device according to claim 3, wherein the tape position restricting portion is an embossed protrusion formed by a projection from a tape sliding surface. 5. The magnetic head device according to claim 2, wherein a tape sliding surface of the outer tape guide portion is an R surface. 6. A head mounting section on which a magnetic head is mounted, an inner tape guide section having a tape position restricting section at a position on the tape running surface of the magnetic head to restrict running of the tape, and this inner tape A method of manufacturing a magnetic head device in which an outer tape guide portion having a tape sliding surface and a tape position regulating portion at a position outside the guide portion and regulating the running of the tape is integrally formed by a metal plate. The head mounting portion, the inner tape guide portion, and the tape sliding surface of the outer tape guide portion are formed in a predetermined shape by bending a metal plate, and then the tape of the inner tape guide portion is formed. A method for manufacturing a magnetic head device, comprising: simultaneously forming a position regulating portion and a tape position regulating portion of the outer tape guide portion. 7. An end face of the tape position regulating portion is formed by cutting off an excess piece of the inner tape guide portion, and at the same time, the tape position regulating portion of the tape position regulating portion is punched out from a tape sliding surface of the outer tape guide portion. 7. The method according to claim 6, wherein the embossed protrusion is formed.