JPH08171757A - Magnetic head device - Google Patents

Abstract

PURPOSE: To obtain a recording/reproducing combined magnetic head wherein an automatic azimuth function and an erasing function exist together. CONSTITUTION: In a rotary reverse type head A, a slope contact part (a) is provided in the bottom end of a tape guide 4 in a recording/reproducing head 2 side in order to obtain an azimuth function and a slope contact part (a) is also provided in a small window inserted tape guide 6 (7) in a tape winding side. However, a tape guide 5 in an erasing head 3 side is constructed slightly wider without providing an slope contact parts therein and no tape restriction is performed herein. Thus, a stable azimuth characteristic is obtained by utilizing high tension in the tape winding side and no adverse influence is given to an erasing characteristic.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a combined recording / reproducing / erasing type magnetic head device used in a magnetic recording / reproducing device such as a tape recorder.

[0002]

2. Description of the Related Art Conventionally, as one of magnetic heads for magnetic recording / reproducing machines, a rotary reverse type head in which a recording / reproducing head and an erasing head are incorporated in one holder is known. FIG.
4 shows a conventional rotary reverse type head. In the figure, 1 is a holder that rotates in response to switching of the tape running direction, 2 is a recording / reproducing head disposed near the center of rotation of the holder, and 3 is an erasing disposed adjacent to the recording / reproducing head. The heads 4 and 5 are tape guides provided so as to guide the magnetic tape T. The tape guides 4 and 5 include a slope contact portion (a) for urging the tape in the width direction at the lower end in order to exert an automatic azimuth function and a tape running reference portion (b) for receiving the tape urged in the upper end in the width direction. Is provided. With this configuration, the magnetic tape T receives a biasing force in the direction of the arrow due to the slope contact portion (a) during traveling, and is pressed against the tape traveling reference portion (b) to travel.

[0003]

In the rotary reverse type head having the above construction, if the recording / reproducing head 2 is assembled and fixed so that the gap is perpendicular to the tape running direction, the guides 4 and 5 are inclined surface contact portions. The automatic azimuth function is demonstrated by the action of. In order to sufficiently secure the above function to the pre-recording / reproducing head 2, the installation position of the recording / reproducing head 2 needs to be close to the rotation center of the holder 1 as described above. Therefore, the erasing head 3 is placed at a position away from the pressing pad (not shown) installed in the cassette. From the above, when the relative position between the holder and the tape running is deviated from the predetermined position due to part precision or assembly variation, the tape T running on the erasing head surface causes a floating F from the erasing head surface, causing erasing failure. easy.

On the other hand, since the tape T running on the recording / reproducing head surface is pressed by the pressing pad of the cassette, as shown in FIG. Since strong contact can be obtained, the floating of the tape in this portion is small and there is no problem, but in the erasing head, since there is no holding pad, strong contact with the head surface occurs at the local tape portion 3a. The floating F is generated as a reaction of the tape portion that is in strong contact.

As described above, the combined recording / reproducing / erasing type rotary reverse type magnetic head having the tape guide having the auto azimuth function in the holder is difficult to achieve both the auto azimuth function and the erasing function, and both functions have sufficient characteristics. The magnetic head having the above has not been realized.

It is an object of the present invention to provide a combined recording / reproducing / erasing type magnetic head device which is compatible with both the auto azimuth function and the erasing function.

[0007]

In order to achieve the above object, a magnetic head device of the present invention comprises a combined recording / reproducing / erasing magnetic head, and tape guides attached to the recording / reproducing side and the erasing side of the head. , A small window insertion tape guide, and a means for urging the magnetic tape in the tape width direction are provided in the recording / playback side tape guide and the small window insertion tape guide on the tape winding side, and the erasing side guide is provided with The gist is that it is configured so that the biasing force does not act on the tape. In the present invention, the head may be a fixed reverse type head or a rotary reverse type head.

[0008]

In the magnetic head device of the present invention, the auto azimuth function is performed by utilizing the biasing force generated by the high tension on the tape winding side, and the biasing force is not generated in the erasing side tape guide. The tape does not easily lift and the erasing function is fully exerted.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described below. FIG. 1 is an embodiment in which the present invention is applied to a recording / reproducing / erasing composite type magnetic head, A is a rotary reverse type head, the same reference numerals as those in FIG. 3 designate the same or similar members, and FIG. The embodiment of A is shown.

In FIG. 2, 6 and 7 are small window insertion tape guides which are inserted into the small windows when a cassette tape is mounted, 8 is a pinch roller, 9 is a capstan shaft, 10
Is a head support. In the present invention, the lower end portion of the tape guide 4 on the recording / reproducing side of the rotary reverse type head A is shown in FIG.
As shown in (b), a slope contact portion (a) for urging the tape in the width direction is provided in order to exert the auto azimuth function,
Corresponding to this, the small window insertion tape guides 6 and (7) on the tape winding side are also provided with the slope contact portions a. However, as shown in FIG. 1C, the erasing side tape guide 5 of the head A is not provided with a slope contact portion and is configured to have a slightly wider width so that the tape is not regulated.

In FIG. 2A, the tape running direction is the forward direction (F
WD) and FIG. 7B show the case of the reverse direction (RVS).
In any case, the small window insertion tape guide on the tape winding side and the recording / playing side guide ensure the auto azimuth function, which is controlled by the side with high tape tension, so it is stable and erases. Side guide 5
Does not impair the erasing characteristics because it does not regulate the tape. It is obvious that the present invention is not limited to the rotary reverse type head.

[0012]

As described above, according to the present invention, it is possible to make the recording / reproducing / erasing combined type head have both the auto azimuth characteristic and the erasing characteristic. Moreover, since the biasing force generated by the high tape tension on the tape winding side is used, a stable auto azimuth function can be secured against various disturbances. In particular, when the present invention is applied to the rotary reverse type, the layout of the shape of the small window insertion tape guide can be adapted to the rotary reverse and the automatic azimuth function can be obtained with a simple configuration.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a front view showing an embodiment of the present invention.

FIG. 3 is a schematic view showing a conventional rotary reverse type head.

FIG. 4 is a diagram showing a tape guide of the head of FIG.

[Explanation of symbols]

 2 Recording / playback head 3 Erasing head 4,5 Tape guide 6,7 Small window insertion tape guide A Slope contact part A Rotating reverse type head

Claims (2)

[Claims] 1. A recording / reproducing tape guide and tape winding device, comprising a recording / reproducing / erasing composite magnetic head, tape guides attached to the recording / reproducing side and erasing side of the head, and a small window insertion tape guide. A magnetic head characterized in that a means for urging the magnetic tape in the tape width direction is provided in the small window insertion tape guide on the taking side, and the erasing side guide is constructed so that the urging force does not act on the magnetic tape. apparatus. 2. The magnetic head device according to claim 1, wherein the head is a rotary reverse type.