JPH10124831A - Magnetic head device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the necessity for adjusting the projecting amount of a head element and to facilitate positioning of a magnetic gap in interference fringes. SOLUTION: A magnetic head device 10 is composed of a head element 11, a head base 13 for fixing this head element 11 in its one side end and an attaching screw 15 inserted in an attaching hole 14 provided in the head base 13 for fixing the same to a scanner 12 and fixed to the scanner 12, and the attaching hole 14 of the head base 13 is disposed in a position for setting a distance from its hole center to the tip of the head element 11 to be a radius R of the tip of the head element 11. The diameter of the attaching hole 14 of the head base 13 is set almost equal to that of the attaching screw 15 inserted therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a video tape recorder (VTR) or a digital audio tape recorder (R-DAT), for example, which records an audio signal or a video signal on a recording track of a magnetic recording medium such as a magnetic tape. The present invention relates to a magnetic head device used for a magnetic head device used for recording or reproducing as a signal.

[0002]

2. Description of the Related Art Conventionally, a magnetic recording and / or reproducing apparatus such as a VTR or R-DAT using a magnetic recording medium such as a magnetic recording tape reads information signals recorded on a magnetic recording tape, or performs magnetic recording. A magnetic head device for recording on a tape is provided. This magnetic head device reads and reproduces an information signal from a signal recording surface of a magnetic recording medium and writes and records an information signal on a signal recording surface of a magnetic recording tape by using a magnetic flux generated by a coil and a magnetic gap.

A conventional rotary drum type magnetic head device will be described with reference to FIGS. The rotary drum type magnetic head device 50 includes a head element section 60, a driving section 67 that drives the head element section 60 to rotate, and a support section 68 that supports the head element section 60.

The head element section 60 includes a head element 56,
A head base 57 on which the head element 56 is disposed and fixed.
And a mounting member (referred to as a scanner) 54 to which the head base 57 is fixed, a mounting screw 58 for fixing the head base 57 to the scanner 54, and an adjusting screw 59 provided on the scanner 54.

The head element 56 is communicated with a magnetic core formed by combining a pair of magnetic core halves 56A and 56B forming a closed circuit in a plane, and a magnetic gap G2 which is a minute gap formed in the magnetic core. And a guide hole 69 for mounting a winding having a substantially rectangular shape. A coil (not shown) is wound around the guide hole 69 of the head element 56.

The magnetic core constituting the head element 56 is made of a magnetic material such as ferrite, and functions as a passage for transmitting magnetic flux from the coil to the magnetic recording medium during recording. do. The magnetic gap G2 serves to narrow the range of the magnetic field in order to record information signals on the magnetic recording medium, and also serves as an inlet for magnetic flux from the magnetic recording medium during reproduction.

The head base 57 is formed in a substantially rectangular shape using brass as a material, and a head element 56 is fixedly provided at one end. In addition, the head base 57 has a mounting hole 66 located on an extension of the magnetic gap G2 so as to be mounted on the scanner 54. Then, as shown in FIGS. 5 and 6, the head base 57 is provided with a mounting element 58 protruding from the outer periphery of the scanner 54, and a mounting screw 58 inserted through the mounting hole 66, which is formed in the scanner 54. By screwing into the screw hole 65, the scanner 5
4 is fixed.

The scanner 54 is formed in a disk shape, and has a central portion fixed to a rotating shaft 63 of a driving section 67. The scanner 54 is provided with a plurality of head bases 57 along the outer periphery. An adjusting screw hole 64 is formed in the scanner 54 on an extension of the magnetic gap G2, and an adjusting screw 59 is screwed into the adjusting screw hole 64.

The driving section 67 comprises a driving motor 55 and a rotating shaft 63 for driving the head element section 60 to rotate. The rotation shaft 63 has a base end connected to the drive motor 55 and a front end fixed to the center of the scanner 54 via a support member 62.

The support section 68 includes a pair of upper drum 51 and lower drum 52 covering the head element section 60,
And a first bearing 61A and a second bearing 61B rotatably supporting a rotating shaft 63 connected to a drive motor 55.

The upper drum 51 is formed in a disk shape, and has a circular recess formed on an end face facing the scanner 54.
The upper drum 51 has a hole 51A formed substantially at the center of the bottom surface of the circular concave portion. The head element section 60
The lower drum 52 is provided at a position opposed to the upper drum with respect to.

The lower drum 52 is formed in a disk shape, and has a circular recess formed on an end face facing the scanner 54.
The lower drum 52 is provided with a hole 52A at substantially the center of the bottom surface of the circular concave portion. The lower drum 52 includes a first bearing 61A and a second bearing 61B that rotatably support a rotating shaft 63 inserted into the shaft hole 52A.
A.

Each of the upper drum 51 and the lower drum 52 is cantilevered at a part of its outer peripheral surface by a drum support 53. In order to prevent the head element 56 of the head element section 60 from contacting the drum support 53,
A groove 70 is recessed.

That is, the magnetic head device 50 drives the scanner 54 to rotate via the rotating shaft 63 by the drive motor 55. The magnetic head device 50 rotates the head element 56 provided on the outer periphery of the scanner 54 by rotating the scanner 54. As shown in FIG. 7, the magnetic head device 50 includes a magnetic recording medium in which each of the head elements 56 runs along the outer peripheral surface of the drum by rotating a plurality of head elements 56 provided in the scanner 54. Each information signal is recorded in M.
At this time, the magnetic gap G2 forms a recording track pattern on the magnetic recording medium M.

The magnetic head device 50 needs to uniformly form a recording track pattern for recording an information signal on the magnetic recording medium M. That is, the magnetic head device 5
0 means that the magnetic gap G2 formed in the head element 56 must be positioned with high precision. Therefore, the magnetic head device 50 includes a mechanism for adjusting the position of the magnetic gap G2.

In the magnetic head device 50, the head base 5
The position of the magnetic gap G2 with respect to the magnetic recording medium M is moved in the direction of the arrow shown in FIG. 5 by adjusting the adjusting screw 59 provided on the scanner 7, or the head base 57 is moved in the radial direction of the scanner 54. , Scanner 54
The position of the magnetic gap G2 is adjusted by determining the amount of protrusion of the head element 56 from the head. Also, in the magnetic head device 50, the head base 57
Are rotated in the circumferential direction of the scanner 54 so that the center of the magnetic gap G2 is aligned with the interference fringes formed by the optical system in the radial direction of the scanner, and each magnetic gap G2 is made to coincide with the radial direction of the scanner 54. Thereby, a uniform recording track pattern is formed.

[0017]

However, in the above-described conventional magnetic head device, the center O of the arc radius R at the tip of the head element 56 is, as shown in FIG. On the head element 56 side,
Further, as shown in FIG. 7, since the hole diameter of the base mounting hole 66 is larger than the diameter of the mounting screw 58, the head base 57 including the head element 56 is mounted on the scanner 54, and the magnetic gap G2 is formed. In the case of adjusting to the radiation direction of the scanner 54, it is necessary to adjust the center of the magnetic gap G2 to the interference fringes required for alignment and to adjust the amount of protrusion of the head element 56 to the magnetic recording medium. Unless it is repeated, character name alignment cannot be performed, and there is a problem that it takes much time.

Therefore, the present invention has solved the above-mentioned problems, and an object of the present invention is to make it unnecessary to adjust the amount of protrusion of the head element and to facilitate the alignment of the magnetic gap with the interference fringes. An object of the present invention is to provide a magnetic head device.

[0019]

According to the present invention, in order to attain the above object, a tip portion of a core portion formed by combining a pair of magnetic core halves in a plane is formed into an arc having a predetermined radius R. A head element in which a magnetic gap and a guide hole for winding winding are formed in the abutting surface of the magnetic core halves; a scanner for scanning and rotating the head element with respect to a magnetic recording medium; The head element is fixed to the portion, and is located on an extension of the magnetic gap of the head element, and has a head base having a mounting hole to the scanner, and is inserted into the mounting hole and formed on the scanner. In a magnetic head device provided with a mounting screw screwed into a head base mounting screw hole, a distance from a center of the mounting hole of the head base to a tip of the core portion is the radius R. Is intended to be placed in a position,
Further, the diameter of the mounting hole of the head base was made substantially the same as the diameter of the mounting screw inserted into the hole.

Therefore, in the present invention, the center of the mounting hole of the head base to the scanner is located at the position corresponding to the center of the radius R of the head element tip, and the diameter of the mounting hole of the head base is equal to the diameter of the mounting screw. Since the diameter is almost the same, the amount of protrusion of the head element is automatically set just by inserting the mounting screw into the mounting hole of the head base and screwing it into the screw hole of the scanner, and including the head element The center of the magnetic gap of the head element can be easily adjusted to the interference fringe for positioning simply by rotating the head base in the circumferential direction of the scanner about the mounting screw.

[0021]

Next, an embodiment of a magnetic head device according to the present invention will be described with reference to FIGS. FIG. 1 is a plan view showing the overall configuration of a magnetic head device according to a first embodiment of the present invention. FIG. 2 is an enlarged plan view showing a head base and a head element in the magnetic head device.
FIG. 2 is an enlarged sectional view taken along line AA of FIG. In FIG. 1, a magnetic head device 10 includes a head element 11, a disk-shaped scanner 12 for rotating the head element 11 for scanning with respect to a magnetic recording medium (not shown), and a head base 13 for supporting the head element 11 on the scanner 12. Is provided.

The head element 11 comprises a pair of magnetic core halves 1
1A and 11B have a core portion formed by combining them in a planar shape, and the tip portion of this core portion is formed in an arc having a predetermined radius R, and is formed at the abutting tip portion of the magnetic core halves 11A and 11B. A magnetic gap G1 is formed, and a guide hole 111 for winding a winding is formed.

The head base 13 is formed in a substantially rectangular shape using brass as a material.
Are arranged in the radial direction of the scanner 12 on the outer peripheral edge of the scanner. A head element 1 is provided at the front end of the surface of the head base 13.
1 is fixed. In the head base 13, a mounting hole 14 for the scanner 12 is located at a position where the center of the hole is on an extension of the magnetic gap G1 of the head element 6 and the axis coincides with the center O of the arc radius R at the tip end. Has been drilled.
The head base 13 is connected to the scanner 12
The head base 13 is fixed to the scanner 12 by screwing the mounting screw 15 into a screw hole 16 formed in the scanner 12 so as to face the mounting hole 14. In addition, mounting screw 1
The diameter of the concentric columnar portion 152 adjacent to the head 151 of the fifth element 5 is formed to be substantially the same as the inner diameter of the mounting hole 14, thereby setting a predetermined value without adjusting the amount of protrusion of the tip of the head element 11. I can do it.

The scanner 12 is fixed to a rotating shaft of a drive motor (not shown) as in the prior art. Reference numeral 17 denotes a drum for guiding the magnetic recording medium, and reference numeral 18 denotes an adjusting screw provided on the head base 57. By adjusting the adjusting screw 18, the position of the magnetic gap G1 with respect to the magnetic recording medium can be adjusted. .

The magnetic head device 10 constructed as described above
In the case where the head base 13 including the head element 11 is mounted on the scanner 12, the mounting screw 15 is inserted through the mounting hole 14 of the head base 13 with the head base 13 set at the mounting position on the scanner 12. The screw portion is screwed into the screw hole 16 of the scanner 12 and temporarily fixed. In this state, the head base 13
The center of the mounting hole 14 is the radius R of the tip of the head element 11.
Of the head base 1
Since the diameter of the mounting hole 14 is substantially the same as the diameter of the columnar portion 152 of the mounting screw 15, the mounting screw 15 is inserted through the mounting hole of the head base, screwed into the screw hole 16 of the scanner, and temporarily fixed. The protrusion amount of the head element 11 is automatically set. Thereafter, the head base 13 including the head element 11 is attached to the scanner 12 around the mounting screw 15.
Is slightly rotated in the circumferential direction of the magnetic gap G1.
Is aligned with the interference fringes formed by the optical system in the radial direction of the scanner, whereby the center of the magnetic gap G1 coincides with the radial direction of the scanner 12.

Therefore, according to the present embodiment, it is not necessary to adjust the amount of protrusion of the head element, and it is possible to easily align the magnetic gap with the interference fringes.

Next, a second embodiment will be described with reference to FIG. In FIG. 4, the same components as those in FIG. 3 are denoted by the same reference numerals, and the description thereof will be omitted. As is clear from FIG. 4, the columnar portion 153 of the mounting screw 15 fitted in the mounting hole 14 of the head base 13 is tapered.
3 is characterized in that the inner surface of the mounting hole 14 into which the fitting 3 is fitted is tapered.

According to the second embodiment, since the mounting hole 14 of the head base 13 and the mounting screw 15 are taperedly fitted, the amount of protrusion of the head element 11 can be automatically set with higher accuracy. Can be. In the second embodiment, the mounting hole 14 of the head base 13 may be a straight hole.

[0029]

As described above, according to the magnetic head device of the present invention, the center of the mounting hole of the head base for the scanner is located at the position corresponding to the center of the radius R of the tip end of the head element. Since the diameter of the mounting hole on the base is almost the same as the diameter of the mounting screw, the amount of protrusion of the head element should be automatically set simply by inserting the mounting screw into the mounting hole on the head base and screwing it into the screw hole on the scanner. Can be. Further, the center of the magnetic gap of the head element can be easily adjusted to the interference fringe for positioning by rotating the head base including the head element in the circumferential direction of the scanner around the mounting screw. .

[Brief description of the drawings]

FIG. 1 is a plan view showing an overall configuration of a magnetic head device according to a first embodiment of the present invention.

FIG. 2 is an enlarged plan view showing a head base and a head element according to the first embodiment of the present invention.

FIG. 3 is an enlarged sectional view taken along AA of FIG. 1;

FIG. 4 is an enlarged cross-sectional view according to a second embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of a main part of a conventional magnetic head device.

FIG. 6 is a longitudinal sectional view of a main part of a conventional magnetic head device.

FIG. 7 is a partial sectional view of a conventional magnetic head device.

FIG. 8 is a schematic diagram of an adjusting operation of the conventional magnetic head device.

FIG. 9 is an enlarged plan view of a conventional head element.

[Description of Signs] 10 ... magnetic head device, 11 ... head element, 11A
...... Magnetic core half, 11B ... Magnetic core half, 12 ...
Scanner, 13: Head base, 14: Mounting hole, 1
5 mounting screws, 152, 153 columnar portion, 111
... guide hole for winding winding, 18 ... adjusting screw, G1 ... magnetic gap.

Claims (5)

[Claims] 1. A tip portion of a core portion formed by combining a pair of magnetic core halves in a planar shape is formed in an arc having a predetermined radius R, and a magnetic gap and a winding are formed on an abutting surface of the magnetic core halves. A head element having a guide hole for winding; a scanner for scanning and rotating the head element with respect to a magnetic recording medium; and the head element fixed to one end, and the head element A magnetic head comprising: a head base having an attachment hole to the scanner positioned on an extension of the magnetic gap; and an attachment screw inserted into the attachment hole and screwed into a head base attachment screw hole formed in the scanner. In the head device, the mounting hole of the head base is disposed at a position where the distance from the center of the hole to the tip of the core portion is the radius R. Apparatus. 2. The magnetic head device according to claim 1, wherein the diameter of the mounting hole of the head base is substantially the same as the diameter of a mounting screw inserted into the hole. 3. The magnetic head device according to claim 1, wherein a columnar fitting portion of the mounting screw inserted into the mounting hole of the head base is tapered. 4. The magnetic head device according to claim 1, wherein the mounting hole into which the tapered columnar fitting portion of the mounting screw is inserted is tapered. 5. A screw hole is formed in the head base between the mounting hole and the head element on an extension of the magnetic gap of the head element, and an adjusting screw screwed into the screw hole is formed on the head base. 2. The magnetic head device according to claim 1, wherein a position of a magnetic gap of the head element is adjusted by abutting the head base mounting surface of the scanner.