JPH0442415A - Magnetic head and magnetic recording/reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a magnetic head used in audio equipment, video equipment, computers, etc., and in particular,
The present invention relates to a magnetic head and a magnetic recording/reproducing apparatus having a structure suitable for maintaining a good contact state between a magnetic head that performs helical scanning and a magnetic tape.

Conventional technology The magnetic recording device described above performs helical scanning using a rotating head! For example, VH3 system VTRs use standard speed recording and playback,
Since dedicated heads are used for double-speed recording/reproduction, high-fidelity audio recording/reproduction, PCM audio recording/reproduction, flying erase, etc., magnetic heads with multiple heads are being used, and combination heads are often used.

First, regarding the configuration of this kind of conventional combination type magnetic henodes.
This will be explained with reference to the drawings and FIG.

Generally, in a magnetic recording device that performs helical scanning,
As shown in FIG. 5, a window is provided on the rotary cylinder 43 to mount the magnetic head in order to facilitate magnetic head replacement, ensure good contact between the magnetic head and magnetic tape, and stabilize cylinder rotation. When the number of magnetic heads mounted on a 0-rotation cylinder increases, a combination head having two or more heads on one window as shown in FIG. 5 is used. A combination head in which two Herad chips 1.2 are mounted on one bend base 3 as shown in FIG. 1 is often used. Further, a device in which head chips are mounted on separate head bases is also used. The hent chips mounted on these devices are mainly bulk-type heads made of ferrite, or H4-layer magnetic heads in which both sides of a magnetic material forming a magnetic path are sandwiched between non-magnetic substrates.

In recent years, the magnetic tapes used in these magnetic recording and reproducing devices have been made thinner, increasing the total length of the magnetic tape that can be stored in a unit volume in order to meet the demand for longer-duration, larger-capacity recording. What to do is being actively considered. However, when the magnetic tape is made thinner, the stiffness of the magnetic tape decreases in proportion to the cube of the thickness.

i*m to be solved by the invention When recording and reproducing is performed on a thick magnetic tape for short-time recording using a combination head such as the one described above, the front shape of the head is smeared into the thick magnetic tape, and the direction of the magnetic head's radiation is The radius of curvature of becomes larger. Generally, the pressure on the entry side of the head is greater than the pressure on the exit side, so especially in a combination head configured in the same core, the radius of curvature in the width direction of the leading head 42 is larger than that of the trailing head 41 in the width direction. is larger than the radius of curvature of When recording and reproducing are performed on a thin magnetic tape for long-term recording under such conditions, since the thin magnetic tape has a small stiffness, deformation in the width direction becomes large and contact with the preceding head becomes insufficient.

As a result, spacing loss increases and the reproduction output of the leading head becomes lower than that of the trailing head. This is observed as a deterioration of the envelope of the output waveform.

In conventional magnetic heads, an attempt was made to improve this phenomenon by reducing the radius of curvature in the width direction of the initial hem 1', but this radius of curvature changes shape due to wear of the magnetic head.
Since the radius of curvature increases with the progress of wear, no substantial improvement could be obtained.

SUMMARY OF THE INVENTION An object of the present invention is to provide a magnetic head and a magnetic recording/reproducing apparatus that solve the problem of a decrease in the reproduction output of a preceding magnetic head when performing helical scanning using a combination head.

Means for Solving the Problems' In order to achieve the above object, the present invention provides a combination head in which two magnetic heads are in VA contact, in which the core width of the sliding surface of the preceding magnetic head is equal to the core width of the sliding surface of the succeeding magnetic head. It is a structure that is thicker than the core width of the current trend.

Effect When helical scanning is performed with the combination head of the present invention, since the core width of the sliding surface of the preceding head is thick, the amount of wear of the preceding head can be made equal to or less than the amount of wear of the following head. Therefore, the radius of curvature in the width direction of the leading head and the radius of curvature in the width direction of the trailing head can be made approximately the same, and the contact of the leading head and the trailing magnetic head against the magnetic tape is approximately the same. You can do it. Furthermore, good head touch is maintained even as wear progresses. This effect provides an essential improvement over the reduction in reproduction output of the preceding head.

Example Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view of an embodiment of a magnetic head to which the present invention is applied, and FIG. 2 is an enlarged view of a magnetic helad tip portion.

Generally, when a magnetic tape and a magnetic head slide, the amount of wear on the magnetic head increases as the contact pressure increases. Since the pressure on the head 42 is greater than the pressure on the trailing head 41, the leading head suffers greater wear and the radius of curvature in the width direction also increases.

The preceding magnetic helad 2 has a core of 180μm in which a 20μmW cobalt-based amorphous alloy magnetic material 14 forming a magnetic path is sandwiched between 80μm-thick nonmagnetic substrates 16 each made of a magnesium nickelate titanate ceramic material.
The magnetic head 1 that follows is a magnetic head 12 having a laminated structure of m, and the following magnetic head 1 is made of the same alloy magnetic material as I4 on a 40 um thick magnesium nickelate titanate ceramic substrate 1.
This is a magnetic head 11 having a laminated structure with a thickness of 100 μm in the core sandwiched between the magnetic heads 1 and 3.

FIG. 5 shows an embodiment of the magnetic recording and reproducing apparatus according to the present invention. In FIG.
have been partially omitted to make the figure easier to read. A rotating cylinder 43 that performs helical scanning in the running direction of the magnetic tape 44
When the rotation directions of are in the same direction, the preceding magnetic helad 42 is the magnetic helad 12 of 180 Ijm in the core,
The trailing magnetic head 41 is a magnetic head 11 with a core of 100 μm.

In a conventional combination head configured in the same core, the leading magnetic head 42 receives stronger contact pressure than the trailing magnetic head 41, so that wear progresses and the radius of curvature in the width direction increases. For this reason, when a thin magnetic tape is recorded or reproduced after running on a thick magnetic tape, the contact condition of the preceding magnetic head deteriorates, and the redistribution force decreases. The envelope of this reciprocating output is shown in FIG. 7(a). In contrast, in the magnetic head of the present invention, since the core width of the trailing magnetic head 41 is thinner than that of the leading magnetic head 42, the radius of curvature in the width direction of both can be approximately equal, and recording of thin magnetic tape is possible. Good output characteristics can also be obtained for reproduction.

The envelope of this reproduced output is shown in FIG. 6(a). As is clear from FIGS. 6 and 7, the 111I structure of the magnetic head of the present invention provides a uniform envelope output.

The combination magnetic head used in the present invention may be configured as follows, for example.

As shown in FIG. 3, after the leading magnetic head 22 and the trailing magnetic head 21 having the same core Cw are attached to one head base, the leading magnetic head 22 and the trailing magnetic head 21 are attached.
The core width of the tape sliding surface on the entrance side of 2 is Cw4, and the core width of the tape sliding surface on the exit side of the following magnetic head 21 is Cw3.
A combination head created by polishing the side surface of the head with an inclined surface 24 such that Cw4>Cw3 also has a structure suitable for the present invention. According to this configuration, the core l of the helad tip of the leading head and the trailing head is
] are almost the same, the head chips can be manufactured under the same conditions, and the track height can be adjusted, resulting in excellent mass production. Although FIG. 3 shows a view in which both sides of the head are polished, a configuration in which only one side is FA polished and the core of the trailing head is made narrower also exhibits the same effect.

Additionally, the following configuration is also possible. As shown in Figure 4,
The trailing magnetic helad 31, which creates the leading magnetic helad 32 and the trailing magnetic helad 31 having the same Cw6 in the core, slides against the magnetic tape before slicing the head chip from the core block. Cw5 (
Cw5<Cw6), and the part to be bonded to the helad base remains Cw6, by step processing using a Guisingu-1 precision slicer, a laser processing machine, etc., approximately parallel to the running direction of the head. The combination head created by this method also has a structure suitable for the present invention.

According to this configuration, since the core width of the Herad chip in the portion to be bonded to the head base is the same, the track height can also be adjusted, resulting in excellent mass productivity such as island size. Although FIG. 4 shows a diagram in which both sides of the trailing head 31 are stepped, a configuration in which only one side is stepped and the core of the trailing head is made narrower also exhibits the same effect.

The magnetic head of this structure can be manufactured by methods other than those described above, and by having a structure in which the core width of the gap portion of the preceding magnetic head is thicker than the core width of the gap portion of the succeeding magnetic head, the magnetic head of the present invention can be manufactured by a method other than the method described above. effect can be obtained.

The magnetic head of this structure is a bulk type ferrite head, rather than a combination type magnetic head with a laminated structure.

It goes without saying that a similar effect can be obtained with a head with a metal-in-gap structure, and the magnetic head with this structure is not only suitable for magnetic recording devices that use a rotating cylinder, but also for magnetic recording devices in which a rotating head rotates between two fixed cylinders. It is obvious that a similar effect can be obtained with a combination head used in a structure in which the magnetic head is fixed and a magnetic medium slides at high speed.

Effects of the Invention As detailed above, the magnetic head of the present invention always maintains good contact between the magnetic head and the M1 tape by using a combination head in which the leading head has a wider head core width than the trailing head. This structure prevents a drop in reproduction output due to spacing loss, that is, a collapse of the envelope.

Furthermore, even if head wear progresses, a good head front shape is maintained, and the industrial utility value is extremely high.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a magnetic head portion in an embodiment of the present invention, FIGS. 2, 3, and 4 are enlarged views of a helad tip portion, and FIG. 5 is a magnetic recording/reproducing apparatus using the present invention. FIG. 6 is an envelope waveform diagram of the reproduced output of the present invention, and FIG. 7 is an envelope waveform diagram of the reproduced output of a comparative example. l... Rad chip to trailing, 2... Leading head chip, 3... Head base, 11...
... Radchip to the rear, 12 ... Radchip to the front, 13 ... Trailing head board, 14...
...Magnetic material, 15...Magnetic gap, 16
・・・・・・Advanced head board, Cwl・・・・・・In the rearward rad core, Cw2・・・・・・In the preceding head core,
21... 7 dots to the rear, 22...
Preceding hentochitsub, 23...Magnetic gap, 2
4...Slanted surface, Cw...In the head core, Cw3...In the sliding surface core on the trailing head exit side, C
w4...Advanced head human side sliding core, 31.
... Trailing head tip, 32 ... Leading 7
Dochip, 33...Magnetic gap, 34...
...Stepped section, Cw5...7 to the rear, inside the sliding surface core, Cw6......to the front, rad core width, 41...
... Trailing head, 42 ... Leading head, 43
... Rotating cylinder, 44 ... Magnetic tape, 45 ... Inclined post, 46 ... Fixed cylinder, 47 ... Inclined post. Name of agent: Patent attorney Shigetaka Awano Haka1 person 1--1 &? fMJ'su・／)" ・・Isui yV+°r ゛j2・−・Shihi line)ノY′+Drop de13−1in1＝・＼・んMJi 14−Stone moan 1ki(− Stone-1 (Ijr〕' C-1--Itehe Noshi J Aya Kintt--4hJ*vL+SuνgeU--Ichisensha Herisunmab Ga5--'1 Moxibustion Prayer: ``Thank you for your prayers.
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Claims (6)

[Claims] (1) A combination head that uses two adjacent magnetic heads, characterized in that the core width of the sliding surface of the leading magnetic head is thicker than the core width of the sliding surface of the trailing magnetic head. . (2) The core width of the gap portion of the preceding magnetic head is
2. The magnetic head according to claim 1, wherein the magnetic head is thicker than the core width of the gap portion of the trailing magnetic head. (3) In a combination head using a magnetic head having a configuration in which both sides of a magnetic material forming a magnetic path are sandwiched between non-magnetic substrates, it is important to note that the substrate of the preceding magnetic head is thicker than the substrate of the following magnetic head. A magnetic head according to claim (1). (4) The magnetic head according to claim (1), characterized in that the magnetic head has an inclined surface on the side surface of the head so that the core width of the sliding surface of the trailing magnetic head is thinner than that of the preceding magnetic head. . (5) The magnetic head according to claim 1, wherein the magnetic head has a stepped portion substantially parallel to the running direction of the head so that the core width of the trailing magnetic head is thinner than that of the preceding magnetic head. (6) A magnetic recording/reproducing device using a combination head having two magnetic heads in one window of a rotating cylinder, characterized in that one of the magnetic heads described in claims (1) to (5) is used. A magnetic recording and reproducing device.