JPS61199208A - Magnetic head - Google Patents

Abstract

PURPOSE:To perform good recording and reproducing operations in any running direction by making the height of a part, which acts upon a magnetic tape, of a tape guide from a magnetic tape sliding surface different between both sides of the sliding surface and changing the height of the magnetic tape from the sliding surface in the tape guide part. CONSTITUTION:At the recording/reproducing time, a magnetic head has the front end fitted to the side where a magnetic tape 3 of a cassette 6 loaded to a recorder faces the external. The magnetic head is slided on the magnetic tape 3, which is fed in the direction of an arrow F or R by rotations of capstans 6 and 6' and pinch rolls 7 and 7', to record and reproduce signals. When the tape is fed in the direction of the arrow F, the magnetic head is displaced preliminarily in the direction of an arrow A by a prescribed length, and thus, the height of the magnetic tape 3 from a sliding surface 1a in parts of tape guides 4 and 5 as shown in the figure, and the magnetic tape 3 is run in areas between upper parts 4b and 4b and upper parts 5b and 5b, and the magnetic tape 3 is not controlled by the tape guide 4 but is controlled by the guide 5 therefore.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a magnetic head, and more particularly to a magnetic head that records and reproduces information by slidingly contacting a magnetic tape, and regulating the running position of the magnetic tape on both sides of the magnetic tape sliding surface. This relates to a magnetic head to which a tape guide is fixed.

[Prior Art] A very general structural example of a conventional magnetic head of this type for recording and reproducing in a cassette tape recorder is shown in the perspective view of FIG. 1 and the I: side view of FIG.

What is indicated by the symbol l on both sides is the main body of the magnetic head, and the -E surface of the main body 1, which is attached to the recorder via a mounting plate (not shown), is curved into an approximately arc shape, and the magnetic tape 3 of the magnetic recording medium is A magnetic tape sliding contact surface (hereinafter referred to as sliding contact surface) la is in sliding contact with the magnetic tape, and a plurality of channels of magnetic cores 2 are fixed in the center of the magnetic tape with the tip surface facing the magnetic gap G. There is.

Tape guides 4.
is fixed with its upper part facing the sliding surface la.

Each of the tape guides 4.5 is formed into a substantially rectangular plate shape having two arm portions 4a, 5a at both ends of the upper edge, and the width between the two arm portions is slightly smaller than the width of the magnetic tape 3. 4a
, sa to regulate the running position of the magnetic tape 3.

Based on this structure, the magnetic tape 3 is
Recording and reproduction are performed by sliding the magnetic tape 3 on the sliding surface la in the F direction or the R direction, and at this time, the running position of the magnetic tape 3 is regulated to a predetermined position by the tape guide 4.5.

However, due to variations in the tape drive system, the magnetic tape 3
The running position of the magnetic tape 3 may be shifted depending on the running directions F and H. In this case, in the configuration in which the magnetic tape 3 is guided by the two tape guides 4.5 as described above, regulations must be made to satisfy both running directions. Therefore, there were problems in that the magnetic tape 3 came into strong contact with the tape guide 4.5 and was deformed, and that the relative angle between the tape and the magnetic gap G became misaligned, reducing recording and reproducing efficiency. .

[Purpose] The present invention has been made in view of the above circumstances, and it is possible to perform recording and playback by optimally regulating the running position of the magnetic tape in both running directions with respect to the above-mentioned type of magnetic head. The purpose is to provide a magnetic head that can perform

[Structure of the Invention] In order to achieve the above object, in the present invention, in the above-mentioned type of magnetic head, the height from the sliding contact surface of the portion of the tape guide that acts on the magnetic tape is set to the height on both sides of the sliding contact surface. A configuration in which the tape guide that acts on the magnetic tape is selected on either side of the sliding contact surface by changing the height of the tape guide portion from the sliding contact surface of the magnetic tape. It was adopted.

[Example] Hereinafter, details of an example of the present invention will be described with reference to FIG. 3 and subsequent figures. Note that this example uses a recording and reproducing head of a cassette recorder similar to the conventional example described above, and in FIG. 3 and below, the same or corresponding parts as in FIGS. The detailed explanation of the same parts will be omitted.

FIGS. 3 and 4 are perspective views showing the structure of the magnetic head according to this embodiment and the positional relationship between the head and the magnetic tape, which varies depending on the sliding direction of the magnetic tape.

As shown in both figures, the structure of the main body 1 side of the magnetic head of this embodiment is the same as that of the conventional example, but the structure of the tape guide 4.5 is different from that of the conventional example.

- The tape guide 4 on the side is formed into a substantially rectangular plate shape having two arm portions 4a at both ends of the upper edge. The opposing inner sides of the tip portions 4b, 4b of the arm portions 4a, 4a are cut out in an L-shape, and the width n between the tip portions 4b, 4b is larger than the width m between the lower portions 4c, 4a. The width m is slightly larger than the tape width and is a suitable dimension for regulating the tape running position, and the width n is a dimension necessary for not regulating the tape running position.

The other tape guide 5 is also formed into a substantially rectangular plate shape with two arm parts 5a at both ends of the upper edge, but in this case, contrary to the tape guide 4, the lower part 5c of the arm part 5a, 5
The opposing inner sides of c are cut out in an L-shape, and the width between them is the aforementioned width n. And the tip portions 5b, 5
The width between b is the aforementioned width m.

That is, the tape guide 4 has its lower parts 4c, 4c restricting the magnetic tape, and the tape guide 5 has its tip parts 5b, 5
The same effect is performed by the tape guide 4.5, and the height of the portion that acts on the magnetic tape from the sliding surface 1a directly below is different for the tape guides 4.5.

Based on the above structure, during recording and reproduction, the leading end of the magnetic head is inserted into the side of the cassette 6 mounted in the recorder facing the external magnetic tape 3, as shown in FIG. Then, by the rotation of the capstan 6.6' and the pinch roller 7.7', the magnetic tape 3 is brought into sliding contact with the magnetic tape 3, which is fed in the direction of the arrow F or the direction of the arrow R, for recording and reproduction.

At this time, if the tape running direction is the F direction, the magnetic head is preliminarily displaced by a predetermined distance in the direction of the arrow in FIG. The result is shown in Figure 3.

In this case, as shown in FIG. 3, the height of the magnetic tape 3 from the sliding contact surface 1a at the 5° portion of the tape guide 4 increases, and the magnetic tape 3 is disposed in the area between the upper portions 4b and 4b and between the upper portions 5b and 5b. Since the tape runs along the tape guide 4, it is not regulated by the tape guide 5, but by the tape guide 5.

Further, when the tape running direction is the R direction, the magnetic head is preliminarily displaced by a predetermined distance in the B direction in FIG. 5, so that the positional relationship between the magnetic head and the magnetic tape 3 is as shown in FIG. Become.

In this case, as shown in FIG. 4, the height of the magnetic tape 3 from the sliding surface 1a at the 5° portion of the tape guide 4 is lowered, and the magnetic tape 3 is located between the lower portions 4c and 4a and between the lower portions 5c and 5a. Since the tape runs along the tape guide 4, it is regulated by the tape guide 5, but not by the tape guide 5.

As described above, according to this embodiment, the running position of the magnetic tape is regulated by one of the tape guides 4.5 depending on the difference in the running directions F and H.

Therefore, each of the tape guides 4 and 5 can be mounted at an optimum position according to the tape running direction in which the regulation receiver is provided, and thereby the magnetic tape can be regulated at an optimum running position in either running direction.

In addition, in the configuration described in L, the tape running direction may be set to the R direction in the state shown in FIG. 3, and the tape running direction may be set to the F direction in the state shown in FIG. 4. Further, the tape guides 4.5 may be replaced.

Further, the number of tape guides 4.5 is not limited to one each, and a plurality of tape guides 4.5 may be provided.

Further, the structure of the tape guide 4.5 itself is not limited to the above-mentioned plate-like structure, and the point is that the heights of the portions of both guides that act on the magnetic tape 3 from the sliding surface 1a may be made different.

In the above configuration, the magnetic head is indicated by A in FIG.

The magnetic tape 3 was displaced in the B direction, but instead the magnetic tape 3 was displaced in the A direction.
, the height of the magnetic tape 3 from the sliding contact surface 1a at the tape guide 4.5 portion may be changed by displacing the tape guide 4.5 in the direction B.

[Effect] As is clear from the above description, according to the present invention, in the magnetic head of the type described in the first technical field section, the magnetic tape sliding contact surface of the portion of the tape guide that acts on the magnetic tape The height of the magnetic tape is set to be different on both sides of the sliding contact surface, and by changing the height from the sliding contact surface of the magnetic tape at the tape guide part, the tape guide that acts on the magnetic tape is set to either side of the sliding contact surface. Since one of the magnetic tapes is selected, the magnetic tape can be regulated and guided to an optimal running position in any running direction, and good recording and reproducing operations can be performed in any running direction. Further, the configuration of the present invention is extremely simple and can be realized at low cost.

[Brief explanation of the drawing]

1 and 2 are respectively a perspective view and a top view of the magnetic tape sliding surface showing the structure of a conventional magnetic head, and FIGS. 3 and 4 show the structure of a magnetic head according to an embodiment of the present invention,
FIG. 5 is a perspective view showing the positional relationship between the head and the magnetic tape that varies depending on the tape running direction, and FIG. 5 is an explanatory diagram showing the displacement of the head according to the tape running direction in the same embodiment. 1... Main body 1a... Magnetic tape sliding contact surface 2
...Magnetic core 3...Magnetic tape 4.5...
Tape guides 4a, 5a...Arm portions 4b, 51)...Tip portions 4c
, 5c lower part of the river

Claims (1)

[Claims] In a magnetic head that records and reproduces information by slidingly contacting a magnetic tape, and in which tape guides are fixed to both sides of the magnetic tape sliding surface to regulate the running position of the magnetic tape, the portion of the tape guide that acts on the magnetic tape is The height from the sliding contact surface is made different on both sides of the sliding contact surface, and by changing the height of the magnetic tape from the sliding contact surface at the tape guide portion, the tape guide that acts on the magnetic tape is made to be different from the sliding contact surface. A magnetic head characterized in that one of the two sides of the contact surface is selected.