JPS6386108A - Magnetic head - Google Patents

Abstract

PURPOSE:To simplify the alignment of a magnetic core, and to make it unnecessary to execute an adjusting work by providing a holding member of the magnetic core, for positioning the magnetic cores of plural heads to be coupled, to prescribed track positions, respectively. CONSTITUTION:A holding plate 8 is formed as one body by a non-magnetic plate material of stainless steel, etc., and a sound signal recording/reproducing magnetic core 2, a control signal recording/reproducing magnetic core 3, and a voice erasing magnetic core 6 are held in an opening part 8b of a body 8a, an opening part 8c, and an arm part 8b, respectively. Therefore, the magnetic core 2 and 3 are positioned in a state that the tip parts are pressed against the lower side edge of the opening part 8b and the upper side edge of the opening part 8c by projections 8d, 8e. The magnetic core 6 is pressed against the lower side edge of a notch part 8g by a projection 8h and positioned, and each of track positions of the magnetic cores 2, 3 and 6 is aligned so as to in a prescribed position relation to each other.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a Ti1-type head, and in particular, to a Ti1-type head, in which a plurality of magnetic heads are combined to record, reproduce, or erase information by slidingly contacting a magnetic core with a magnetic recording medium. This invention relates to a composite magnetic head.

[Prior Art] Figure 3 illustrates the structure of a conventional magnetic head of this type, a composite head used in a VTR (video tape recorder), which combines an audio/control head and an audio erasing head. be.

In FIG. 3, reference numeral 1 denotes an audio/control head, which includes a magnetic core 2 for recording and reproducing audio signals on the audio track of the video tape in a VTR (not shown), and a head servo head for the control track of the video tape. Magnetic core 3 for recording and reproducing control signals
have. The magnetic core 2.3 is fitted and fixed to the case 4 of the audio/control head 1, and its respective tip surfaces with magnetic gaps are inserted into openings 4a and 4b formed in the tape sliding surface on the front of the case 4. placed so as to be exposed.

Further, in FIG. 3, reference numeral 5 denotes an audio erasing head, which has a magnetic core 6 for erasing the signal of the audio track of the video tape. The magnetic core 6 is held by a holder 7 formed by molding, and the leading end surface having two magnetic gaps for erasing is exposed on the tape sliding surface in front of the holder 7.

Then go to audio/control rad 1 and go to audio deletion rad 5
is integrated by aligning the track positions of the magnetic cores 2 and 6, inserting the screw 9 into the audio erasing pad 5, tightening it to the audio/control head 1, and gluing both heads 1.5. is combined with

[Problems to be Solved by the Invention] By the way, in such a composite head, both heads 1.
Conventionally, a common method for aligning the track positions of the magnetic cores 2 and 6 of 5 is to perform positioning while observing the respective track positions with a microscope, a television monitor, or the like.

However, at this time, the track position of the magnetic cores of the two heads must be finely adjusted while the azimuth angle of the magnetic gap of the magnetic core of one head is aligned, making the adjustment work extremely difficult and time-consuming. [Means for Solving the Problems] In order to solve the above-mentioned problems, according to the present invention, a magnetic core is brought into sliding contact with a magnetic recording medium to record information. In a composite magnetic head formed by combining a plurality of magnetic heads for reproducing or erasing, each of the magnetic cores is arranged so that the respective track positions of the magnetic cores of the plurality of combined heads are in a predetermined positional relationship with each other. We adopted a structure that includes a holding member that holds and determines the position.

[Function] According to this structure, each of the magnetic cores of the plurality of heads is positioned by the holding member, and the respective track positions are aligned in a predetermined positional relationship with each other. That is, the track positions of the magnetic cores can be aligned with each other very easily through this holding member, and no adjustment work is required for alignment.

[Example] Hereinafter, details of embodiments of the present invention will be described.

Figures 1 (A) and (B) show the VTR described earlier as this embodiment.
In both figures, which are used to explain the structure of a composite head formed by combining an audio/control head and an audio erasing head, the same or corresponding parts as in Figure 3 of the conventional example are given the same reference numerals. , description of the same parts will be omitted.

The composite head shown in FIGS. 1A and 1B is provided with a retaining plate 8 as a structure related to the present invention that is different from the conventional example.

Each of the magnetic cores 2.3.6 is held and positioned so that the respective track positions of the magnetic cores 2,3.6 are in a predetermined positional relationship with each other.

The holding plate 8 is made of a non-magnetic material such as stainless steel or brass, and its shape and structure are as shown in FIGS. 2(A) and 2(B). That is, the holding plate 8 is integrally formed from a non-magnetic plate material, and its main body 3a is approximately rectangular and curved in an arc shape, and magnetic cores 2 and 3 made of ferrite etc. are formed in the upper and lower parts of the holding plate 8. Rectangular openings 8b and 8c are formed to hold the respective ones. A semicircular projection 8d is formed at the center of the upper edge of the opening 8b, and a semicircular projection 8e is also formed at the center of the lower edge of the opening 8C.

Further, as shown in FIG. 2(A), an arm portion 8f bent in an L-shape is protruded from the upper left edge of the main body 8a of the holding plate 8 in FIG. 2(B). A rectangular notch 8g for holding the magnetic core 6 made of ferrite or the like is formed in the portion 8f. Two small semicircular projections 8h are also formed on the upper edge of the notch 8g.

Further, as shown in FIG. 2(A), L-shaped bent protrusions 8i and 8j are protrudingly provided at the upper and lower parts of the right side edge of the main body portion of the holding plate 8 in FIG. 2(B). There is.

On the other hand, the head of this embodiment has a structure different from that of the conventional example in order to provide the retaining plate 8.
The case 4 is formed into a rectangular cylindrical shape so that the holding plate 8 can be fitted therein, and the front side thereof is open. Furthermore, in the case 4 (FIG. 1 CB), a notch 4a into which the arm portion 8a of the holding plate 8 is fitted is formed at the upper front of the left side plate. Although not shown, holes are formed in the right side plate of the case 4 into which the protrusions 8i and 8j of the holding plate 8 are inserted.

Although not shown, the holder 7 of the sound erasing pad 5 is provided with a hole into which the distal end of the arm portion 8f is inserted, and a groove into which the proximal end is fitted.

When assembling a composite head based on this structure,
First, attach the holding plate 8 to the case 4 of the RAD 1 to the audio/control.
As shown in Fig. 1(B), insert the projecting pieces 8i and 8j.
is inserted into the previously described hole (not shown) in the case 4, and the arm portion 8f is fitted into the notch portion 4a of the case 4, thereby fixing the holding plate 8 to the case 4.

Next, the magnetic cores 2 and 3 are fitted into the case 4 together with other head constituent members, and the tips of the magnetic cores 2 and 3 are fitted into the openings 8b and 8c of the holding plate 8, respectively, to hold the magnetic cores 2 and 3. The cores 2 and 3 are fixed in the case 4 together with the chopsticks and other constituent members.

At this time, the tips of the magnetic cores 2 and 3 are pressed and positioned by the projections 8d and 8e against the lower edge of the opening 8b and the upper edge of the opening 8C, respectively, as shown in FIG. 1(B).

Next, FIG. 1(A) shows the arm portion 8f of the holding plate 8 incorporated into the audio/control controller 1.

As shown in (B), it is inserted and fitted into the holder 7 (non-magnetic) of the audio erasing head 5, and the magnetic core 6 around which the coil IO is wound is held in the notch 8g. magnetic core 6
are pressed against the lower edge of the notch 8g by each of the protrusions 8h and positioned. Figure 1 (C) shows the magnetic core 6.
The positional relationship between the arm portion 8f and the arm portion 8f is illustrated.

Thereafter, the audio/control controller 1 and the audio erasing head 5 are integrally connected by screwing or gluing to complete a composite head.

The tape sliding surfaces of both heads 1 and 5 may be shaped and finished by grinding after they are combined, or may be performed individually before they are combined.

As described above, according to the head of this embodiment, each of the magnetic cores 2, 3.6 is positioned by the holding plate 8, and the track positions of the magnetic cores 2, 3.6 are mutually positioned at predetermined positions. Fitted into a relationship.

Therefore, mutual alignment of the respective track positions of the magnetic cores 2, 3.6 can be performed extremely easily via the holding plate 8, and no adjustment work for alignment is required. Therefore, the number of man-hours required for assembling the composite head can be reduced, and manufacturing costs can be reduced.

Furthermore, if the shape and dimensions of the holding plate 8 are made highly accurate, the track position of each magnetic core can be matched with high precision.

It goes without saying that similar effects can be obtained by using such a holding plate even when three or more magnetic heads are combined to form a composite head.

Furthermore, it goes without saying that the shape and structure of the holding plate are not limited to those described above.

[Effects of the Invention] As is clear from the above description, according to the present invention, there is provided a composite type in which a plurality of magnetic heads are combined, each of which records, reproduces or erases information by slidingly contacting a magnetic core with a magnetic recording medium. In the magnetic head, a holding member is provided for holding and positioning each of the magnetic cores so that the respective track positions of the magnetic cores of the plurality of heads to be combined are in a predetermined positional relationship with each other. It is extremely easy to align each track position of the magnetic core through the magnetic head, eliminating the need for adjustment work for alignment, which has the excellent effect of reducing the number of steps required to assemble the composite head and reducing manufacturing costs. .

[Brief explanation of the drawing]

1A, 1B, and 1C respectively relate to embodiments of the present invention, and FIGS. 1A and 1B are a cross-sectional plan view and a front view showing the structure of a composite head, and FIGS. Figure (C) is a sectional view of the sound erasing head, and Figures 2 (A) and (B) are respectively Figure 1 (A). (B) is a top view and a front view showing the structure of the holding plate in the middle, and FIG. 3 is a front view showing the structure of a conventional composite head. l...Audio/control head 2.3.6...Magnetic core 4...Case 5...Audio erasing head 7.
... Holder 8 ... Holding plate 10 ... Coil funeral Δ diagram

Claims (1)

[Claims] In a composite magnetic head formed by combining a plurality of magnetic heads whose magnetic cores are in sliding contact with a magnetic recording medium to record, reproduce, or erase information, the track position of each of the magnetic cores of the plurality of combined heads is A magnetic head characterized in that a holding member is provided for holding and positioning each of the magnetic cores so that they are in a predetermined positional relationship with each other.