JPS6334091Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head in which a pad in a cassette half is deformed and applied to a gap portion of the magnetic head.

Conventionally, pads in cassette halves have the disadvantage that even if the tape is of the same type, the pad pressure is not constant due to uneven felt thickness. Furthermore, in tape recorders that use a combination head in which the recording head and playback head are integrated into the head case, it is difficult to obtain a good tape touch even when the pad is pressed under normal conditions, and especially when the frequency characteristics are In the high range, the characteristics were poor and there was a tendency for level fluctuations to be large. To solve this drawback, conventional methods have been used, such as pressing the erase head against the pad to strengthen the back tension, a double capstan method in which capstans are installed on both sides of the magnetic head, and a tension servo method. However, in order to press the pad against the erasing head, a pole must be erected in front of the erasing head to provide the pad, which poses a problem with the lifespan of the pad and is expensive in terms of structure. In addition, the double capstan system requires improvements in the precision of parts such as the parallelism of the capstan and fine adjustment in order to obtain good tape running, making it very expensive. Furthermore, the tape tension servo method requires improved precision and fine adjustment of parts, making it expensive. Further, it has disadvantages such as not being able to be used in a tape recorder using a cassette half, and requiring a complicated mechanism.

A ``magnetic head'' having a structure similar to the magnetic head proposed in the present invention has been proposed in Japanese Utility Model Publication No. 54-5611. However, this proposed ``magnetic head'' is a magnetic head that is inserted into two small window holes in the cassette half, in addition to the three relatively large window holes into which the normal magnetic head and pinch rollers are inserted. Half pads usually do not exist, and the tape sliding surface of the magnetic head is inclined at an angle of θ°, so that the magnetic tape is This is a "magnetic head" that slides into contact with a protrusion on one side by exerting a force that tends to pull the head toward one side. It has nothing to do with the combination head.

In view of the above-mentioned drawbacks, the object of the present invention is to propose a magnetic head in which a protrusion provided on one side of the magnetic head is brought into contact with one side of the pad to deform the pad, thereby bringing the magnetic tape into secure contact with the gap part. There is a particular thing.

The present invention will be explained below with reference to illustrated embodiments. 1st
In the figure, a magnetic head 1 has a recording head core 3 and a reproducing head core 4 protruding from a tape sliding contact portion 2 on the front surface, and gap portions 3a and 4a are provided respectively. A protrusion 6 is provided outside the tape sliding contact portion on the opposite side of the sliding contact portion 2 to the side where the gap portions 3a, 4a are in sliding contact with the magnetic tape 5.

The projection 6 is cut out when the sliding contact portion 2 is ground, and is formed to have a thickness of, for example, 0.1 mm to 0.5 mm.
A phosphor bronze plate is fixed to the upper edge of the magnetic head 1 and the protrusion 6
You can also use it as Further, the protrusions may be formed by coating.

In FIGS. 2 and 3, the cassette half 7 normally has a felt 9 held at the center of a leaf spring 8 behind the central window hole, and the vertical width of the pad 9 is larger than the width of the magnetic tape 5. The magnetic head 1
When inserted into the cassette half 7, the protrusion 6 comes into contact with the upper side of the pad 9, and the pad 9 is deformed about the fulcrum A of the leaf spring 8, so that the upper side is retreated rearward. Also, the lower side of the pad 9 is pushed out toward the front magnetic head. As a result, as shown in FIG. 4, the upper end of the widthwise direction of the magnetic tape 5 is brought into contact with the lower side of the protrusion 6, thereby regulating the position of the tape running. The back tension is applied more than before and the sliding contact is made.

Therefore, on the tape sliding contact portion 2 of the magnetic head 1,
Even if the ends of the recording head 3 and the reproducing head 4 are provided protruding in the running direction of the magnetic tape 5, they are surely brought into contact with the respective gap portions 3a, 4a. Also, if there is variation in the pad thickness, for example as shown in Figure 5, the back tension of the pad 9 would be insufficient in the past, but in the case of the present invention, sufficient back tension is applied for recording and reproduction. . The same effect as described above can be obtained even when used in a recording/playback head or a dedicated recording/playback head.

Since the present invention is constructed as described above, it is possible to improve the tape contact with the magnetic head sliding contact portion of the magnetic tape with a simple construction, and to increase the pressure back tension of the pad against any of the cassette halves. This makes it possible to provide a magnetic head that is extremely inexpensive compared to conventional mechanisms, has good frequency characteristics, and exhibits excellent practical effects such as small level fluctuations.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a front perspective view of the magnetic head, FIG. 2 is a side view of the magnetic head facing the pad in the cassette half, FIG. 3 is an explanatory view of the pad, and FIG. FIG. 4 is an explanatory diagram of a magnetic tape and a pad in contact with a magnetic head, and FIG. 5 is an explanatory diagram of a pad having an uneven thickness. 1...Magnetic head, 2...Head sliding contact part, 3...
...Recording head, 3a, 4a...Gap section, 4
...Reproducing head, 5...Magnetic tape, 6...Protrusion, 9...Pud.

Claims (1)

[Scope of utility model registration request] In a magnetic head, which is provided in a tape recorder equipped with a cassette half and performs magnetic recording and reproduction, and which enters a central window hole of the cassette half and slides into contact with the magnetic tape, the gap portion of the magnetic head is opposite in the width direction of the tape. A protrusion is provided outside the tape sliding contact portion on the side, with which a part of the pad mounted in the cassette half comes into contact, and when the protrusion comes into contact with a part of the pad, the pad is deformed, and the pad causes the tape to A magnetic head that firmly presses against the gap.