JPS60182002A - Magnetic head - Google Patents

Abstract

PURPOSE:To simplify the angle adjustment at fitting by adopting different size for the butted face of holding members and allowing the difference of the sizes to bring the protruded part of the butted face into contact onto the reference face of a fixed member and fix it so as to eliminate the difference and variation of the magnetic gap angle. CONSTITUTION:The angle of a face mated to the butted faces 2a, 2b to the reference face A of the magnetic gap 3 is fixed to a prescribed angle theta to an angle of end faces 5e, 5f to the reference face A. Since the angle theta is decided with high accuracy in forming the supporting member 5 without variation, the shift of angle of the magnetic gap 3 to the reference face A and the variation in the shift are eliminated. Furthermore, a size B between the reference face A and the lower end of a core half 1', that is, a track lower end is decided definitely as the size being the sum of the height C of a projection 5d from the reference face A and a thickness D of the holding member 2'. Since the sizes C, D are decided with high accuracy in forming the supporting member 5 and the holding member 2', the size B, that is, the size of track position from the reference face A is decided to a prescribed value with high accuracy.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a magnetic head, and more particularly, the present invention relates to a magnetic head, and more particularly, a magnetic core is made by abutting a pair of holding members holding a half-core core with an abutting surface flush with the abutting surface of the half-core. The present invention relates to a magnetic head.

[Prior art]

Magnetic gap angle and magnetic loss W in a magnetic head
occurs. That is, if the above-mentioned angular shift is θ and the recording wavelength is λ, then the loss W is (here, the A-nidoran 2 width X tan θ).

Therefore, the loss W increases as the recording frequency increases.

The angular deviation that causes the above-mentioned loss is caused by a deviation in the magnetic gap angle on the magnetic head side and a variation in the running angle of the magnetic tape on the magnetic recording/reproducing device side. Therefore, in order to correct this angular deviation, after the magnetic head is attached to the recording/reproducing apparatus, the magnetic tape is run, and the angle between the magnetic gap of the magnetic head and the magnetic tape is adjusted.

Now, in connection with the above-mentioned problem of angular deviation of the magnetic gap, the conventional structure of the type of magnetic head mentioned at the beginning will be explained with reference to FIG.

This figure is a schematic view of the magnetic head viewed from the magnetic tape sliding surface side. Reference numeral 1.1' indicates half cores constituting the magnetic core, each of which is held by a holding member 2.2'. Abutment surface 2a of holding members 2, 2'
r2b, 2a', 2b' are the abutting surfaces ia, ia of the core halves 1, 1' by surface grinding.
' is formed flush with each of the holding parts, l
d2.2' butting surface 2 a + 2 b, 2
A magnetic head element 4 including a magnetic core is constructed by a/2 b' and abutting surfaces ia, 1a' of core halves 1 and 1' being butt-joined through a magnetic gap 3.

However, conventionally, as shown in the figure, the magnetic head element 4 is attached to a part of the holding parts 2, 2' (in this case, holding part 4=J2
One outer surface of +' 2/) is fixed to a magnetic recording/reproducing device as a reference surface A for fixation.

Therefore, the abutting surfaces 2a+21], 2a', 21)', Ia of the holding members 2, 2' and the core halves 1, 1'
.

The slope of the error during surface grinding of 1 a/ becomes the slope of the magnetic gap 3 with respect to one reference plane A, and the angles θ and θ' of the magnetic gap 3 shown in the same figure deviate from a predetermined angle, for example, 90°. Resulting in.

Also, for the same reason, as shown in Figure 2, the positional deviation of the butt points 1al'2a12b, 1a'1, φ2a/, 2b' becomes a deviation in the angle θ of 3° of the magnetic cab. It ends up.

As described above, in this type of magnetic head, an angular deviation of the magnetic gap occurs, and since this angular deviation is due to the above-mentioned error during surface grinding, positional deviation, etc., it varies from magnetic head to magnetic head.

For this reason, this type of magnetic head has a drawback in that it takes a lot of time and effort to adjust the angle during installation as described above.

〔the purpose〕

The present invention has been made in order to eliminate the above-mentioned conventional drawbacks, and it is a magnetic head that eliminates deviations and variations in the magnetic gap angle in the above-mentioned types of magnetic heads, and that simplifies the angle adjustment during installation. The purpose is to provide heads.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

In each figure, parts that are the same as or correspond to those in FIGS. 1 and 2 are designated by the same reference numerals.

FIG. 3 shows the structure of the magnetic head element 4 in which the core half-hole 1.1' and its holding portion 4d2.2' are brought into contact with each other, as viewed from the magnetic tape sliding surface side.

As shown in the figure, in this embodiment, the holding member 1 that holds one of the core half bodies 1 is arranged in the width direction of the core half body 1;
That is, the dimensions of the abutting surfaces 2a, 2b in the track width direction along the magnetic gap 3 are the abutting surfaces 7'a', 2'b of the holding member 2' that holds the other half core 1'.
The dimension in the same direction is also larger than that of '.

Therefore, in the abutted state shown in the figure, the holding members 2
The outer portions of the abutting surfaces 2a and 2b are the holding member 1'
It protrudes due to the dimensional difference between the abutting surfaces 2'a' and 2'b'.

The magnetic head element 4 having the above structure is assembled and fixed in the support member 5 shown in FIG. 4.

As shown in the figure, the support member 5 has walls 5a to 5C in three directions, and is formed into a block shape with an abbreviated cross section.
The outer surface of one wall 5a is a reference surface A for fixing the magnetic head.
It becomes. In addition, a protrusion 5d is provided at the inner center of the wall 5a.
is formed, and the outer surface 5e of this protruding portion 5d and the wall 5
The end face 5f of C is on the same plane, and the angle θ at which this plane intersects with the reference plane A is set to a predetermined value, for example, 90°. Further, four fitting portions 5g are defined by the protrusion 5d and the three walls 5a to 5C.

Next, FIG. 5 shows a state in which the magnetic head element 4 is assembled into the support member 5 and fixed.

As shown in the figure, the core of the magnetic head element 4 is partially closed 1'.
The holding portion 2' portion is fitted into the fitting portion 5g of the support member 5, and the abutting surface 2a of the core holder 2.

The head element 4 is fixed by abutting the end surface 5f of the wall 5C and the end surface 5e of the protrusion portion 5d and joining the outer portion thereof which protrudes due to the dimensional difference in the wall 5C.

According to the above structure, as shown in the figure, the facing surface 2
The angle of the magnetic gap 30, which is flush with a and 7b, with respect to the reference plane A is fixed to a predetermined angle θ at which the end face 5 c + 5 f intersects with the reference plane A. Since this angle θ can be determined with high precision and without variation when forming the support member 5, it is possible to eliminate the angular deviation of the magnetic gap 3 with respect to the reference iml'A and the variation in the angular deviation.

The dimensions are the reference plane A shown in the same figure and the lower end of the core half-opened 1', that is, l.
・The dimension B between the lower rack iIA is the sum of the height dimension C of the protrusion 5d from the reference plane A and the thickness dimension 1) of one side of the holding part 2', since there is no deviation or variation in the angle θ. It can be uniquely determined as The dimension C, 1) is determined with high precision during the formation of the support member 5 and the holding member 2'. Therefore, the dimension B, that is, the track position dimension from the reference plane A, can be determined in a predetermined position with high accuracy.

Note that the shape and structure of the support member 5 is not limited to the above-mentioned one, and may be any shape as long as it can fix the protruding portion due to the dimensional difference between the abutting surfaces of the holding members 2 and 2' with respect to the reference plane A at a predetermined angle.

In addition, the above-mentioned abutment surfaces 'la, 2a' and 2I].

The dimensional relationship of 2b' along the track width direction only needs to be different from each other, and is not limited to the relationship described in 2.

〔effect〕

As is clear from the above description, according to the magnetic head of the present invention, the dimensions of the abutting surfaces along the track width direction are made different between the holding members, and the protruding portions of the abutting surfaces are formed by the magnetic head due to the difference in dimensions. Since the structure is fixed at a predetermined angle with respect to the fixing reference plane, there is no deviation or variation in the magnetic gap angle.The problem with the above-mentioned angle adjustment when installing the magnetic head is variation in the magnetic tape running angle. Not only that, the angle adjustment is greatly simplified, and the cost of the entire magnetic recording/reproducing apparatus can be reduced.

Further, according to the present invention, since the track position dimensions in the magnetic head can be determined with high precision, it is possible to suppress variations in the trunk position with respect to the magnetic tape at the time of attachment, and is particularly suitable for a multi-channel head.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are explanatory diagrams showing the configuration of a conventional magnetic head and the magnetic gear Q angle deviation, respectively. FIG. 3 and the following are detailed explanations of the present invention. Schematic top view seen from the deep sliding surface side,
FIG. 4 is a schematic top view of the support member, and FIG. 5 is a schematic top view of the magnetic head element fixed to the support member. 1.1'...Core half 2,2'...Holding part 2a
, 2a', 2b, 7b' =-butting surface 3...
Magnetic gap 4...Magnetic head element 5--Support part A" Patent applicant Canon Electronics Co., Ltd. Figure 1 Figure 2 Front 3 Figures

Claims (1)

[Claims] A pair of holding members that hold the core half-closed are made such that the dimensions of the abutting surfaces of the holding members along the track width direction of the half-core A are different, and the protruding portion of the abutting surface due to the difference in dimension is attached to the magnetic head fixing member. A magnetic head characterized in that it is fixed in contact with a reference surface.