JPS599401Y2 - magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head, particularly an erasing magnetic head applied to a cassette tape recorder.

In a cassette tape recorder, the magnetic head is brought into contact with the magnetic tape inside the cassette through a window provided at the front of the cassette.

In this case, the positional relationship between the magnetic head and the tape is such that a tape guide is provided in front of the head to regulate the position of the tape in the width direction so that the magnetic gap of the head is surely in contact with a predetermined track of the tape. .

Various types of tape guides have been proposed.

For example, as shown in FIG. 1, in an erasing magnetic head,
Two tape guide plates 3a and 3b are bonded with adhesive 4 to the upper and lower surfaces of the core portion 2 that protrudes from the front of the magnetic head housing 1, so as to protrude from the front of the core portion 2. The thickness of the core 2, and thus the distance d between the guide plates 3a and 3b, is selected in accordance with the width of the magnetic tape 5 to be guided, and the tape 5 is moved between the guide plates 3a and 3b to remove the tape 5. There is one in which the position in the width direction is regulated to set the positional relationship with the core 2 to a predetermined relationship.

However, in the case of such a structure, for example in a cassette tape recorder, the guide plates 3a and 3b
Since the material is minute, the work of pasting it onto the core 2 one by one using the adhesive 4 is extremely complicated and hinders mass production.

The present invention provides a magnetic head that can be assembled and manufactured with a tape guide through simple operations.

An example of the present invention will be described in detail with reference to FIG.

FIG. 2 is a side view of the magnetic head 10 according to the present invention, and FIG. 3 is a front view thereof.

The present invention comprises a magnetic head main body 11 and a tape guide member 12, as shown exploded in FIG.

In the illustrated example, the magnetic head main body 11 is an erasing magnetic head main body, and FIG. 5 is a front view of the main body 11.

Reference numeral 13 designates a housing for the magnetic head main body 11, and a core portion 14 protrudes from the front of the housing 13.

The thickness d of this core portion 14 is selected in accordance with the width of the magnetic tape 5.

As shown in FIG. 5, the core portion 14 is composed of a magnetic core 14a having a magnetic gap g and a non-magnetic core 14b, and the core portion 14 forms a surface in contact with the magnetic tape.

15 indicates a terminal pin of the head coil.

In the illustrated example, a pair of leg pieces 16 are provided protruding from the rear of the casing 13, and a mounting hole 17 is provided in the pair of leg pieces 16, so that the magnetic head main body 1
1 is attached to a predetermined part of the tape recorder.

The tape guide member 12 is shown in a front view in FIG.
As shown in the top view in FIG.
opposing side plate portions 18A that support both sides of the case 13;
and 18B, and a front plate 18C that spans both front ends of the tape guide holder, which forms a U-shape, and a pair of tape guides that protrude oppositely from the upper and lower sides of the window 19 provided on the front plate 18C. The tape guide portion is made up of elastic tongue pieces 20a and 20b, and the whole is integrally molded with a resin mold.

Notches 21 are provided from the rear of each of the opposing side plates 18A and 18B of the guide holding portion at positions offset to both upper and lower sides, and elastic leg pieces are provided between each pair of these notches 21 and the upper and lower edges. Shape 22.

At the rear ends of these elastic legs 22, hooks 23 are formed which protrude from both upper and lower edges.

On the other hand, grooves 24A and 24 are provided on both side surfaces of the casing 13 of the magnetic head main body 11, into which opposing side plates 18A and 18B of the guide holding portion of the tape guide member 12 are fitted, respectively.
B is formed.

These grooves 24A and 24B have tapers 2 on both upper and lower sides thereof to widen the widths of the grooves 24A and 24B inwardly.
5, and on both upper and lower edges of opposing side plates 18A and 18B of the guide holding portion of the tape guide member 12,
A taper 26 is formed to match the taper 25 described above.

Further, by forming wide portions on the rear edges of the grooves 24A and 24B, stepped portions 27 are formed on both upper and lower edges, and the hook portions 23 of the leg pieces 22 of the tape guide member 12 engage with the step portions 27. Eggplant.

The distance between the proximal ends of the opposing tongues 20a and 20b of the tape guide member 12 is selected in accordance with the thickness d of the core portion 14 of the magnetic head main body. , are preselected in advance so that the spacing is smaller than the thickness d.

In this arrangement, the tape guide member 12 is attached to the magnetic head main body 11.

This installation is performed on both opposing side plates 18A of the guide holding part.
and 18B are press-fitted from the front into the grooves 24A and 24B on opposite sides of the casing 13 of the magnetic head main body 11, respectively.

During this insertion, the free end of the elastic tongue piece 22 is inserted into each side plate 18.
The hook portion 23 of the elastic leg piece 22 is bent inward along the plate surface direction of A and 18B against its elasticity and press-fitted into the grooves 24A and 24B, and in the fitted state returns to its original position.
are fitted securely into the step portions 27 of each groove 24A and 24B.

At this time, the front plate 24C of the tape guide member 12 is
A core part 14 is inserted between the tongue pieces 20a and 20b, and this core part 14 abuts the front surface of the tongue piece 20a and the tongue piece 20b.
The tips of the tongues 20a and 20b are pushed apart by the core part 14 while being elastically supported by the tongues 20a and 20b, and the distance between them is defined by the thickness d of the core part 14.

At this time, the lengths of the tongues 20a and 20b are selected so that they protrude a predetermined amount from the front of the core 14, as shown in FIG. 2, and the magnetic tape 5 is guided to run between these protrusions. It is done like this.

That is, the position of the magnetic tape 5 in the width direction is restricted between the tongue pieces 20a and 20b.

As described above, according to the present invention, the tape guide member 12
A magnetic head having a tape guide can be constructed by simply fitting the tape into the magnetic head main body 11, so the assembly is extremely simple.

Furthermore, since the tape guide member 12 is constructed entirely of an integrally molded body, its manufacture is extremely simple and it is excellent in mass production.

In addition, the elastic tongues 20a and 20b of the guide plate that regulate the position of the magnetic tape in the track width direction are pre-selected to be smaller than the tape width, that is, the thickness d of the core portion 14, When attached to the main body, the core part 14 spreads out and holds it at a predetermined interval, so if the thickness d of the core part 14 is set accurately in accordance with the tape width, the tape guide The spacing between the tongue pieces 20a and 20b as plates is reliably regulated, and manufacturing thereof does not require high precision, which further facilitates its manufacture.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view showing an example of a conventional magnetic head, FIG. 2 is a side view showing an example of a magnetic head according to the present invention, FIG. 3 is a front view thereof, and FIG. 4 is a side view showing an example of a conventional magnetic head. 5 is a front view of the magnetic head main body, FIG. 6 is a front view of the tape guide member, and FIG. 7 is a top view thereof. 10 is a magnetic head according to the present invention, 11 is a magnetic head main body, 12 is a tape guide member, 13 is a case of the magnetic head main body, 14 is a core portion having a magnetic gap g, 24A, 24B
and 24C are the left and right side plates and front plate of the tape guide section, respectively, and 20a and 20b are elastic tongue pieces of the guide holding section.

Claims (1)

[Scope of utility model registration request] It consists of a magnetic head main body in which a core portion having a magnetic gap protrudes from the front of the magnetic head casing, and a tape guide member attached to the magnetic head main body, and the tape guide member has a distal end with a spacing as described above. A tape guide portion consisting of a pair of opposing elastic tongues whose thickness is smaller than the thickness of the core portion of the magnetic head body, and a guide holding portion fitted into the magnetic head housing are integrally formed. The guide holder is formed in a U-shape and is fitted from the front of the magnetic head casing so as to support the casing from both sides. An elastic leg piece is provided to be locked to the magnetic head housing, and the tongue piece of the tape guide part is provided to protrude from the front plate of the guide holding part, and the above-mentioned tongue piece is provided between the pair of tongue pieces. A core portion of the magnetic head main body is inserted, and the distance between the tips of the tongues is defined at a predetermined distance depending on the thickness of the core portion, and the pair of tongues protrudes from the tips of the core portion. A magnetic head whose position in the width direction of the magnetic tape is defined by the distance between the leading ends.