JP2543750B2 - Magnetic head and magnetic recording / reproducing apparatus - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a magnetic head suitable for use in combination with a tape (so-called metal tape) using a magnetic magnetic material having a high coercive force as a magnetic recording medium, and more particularly, to a magnetic head. The present invention relates to a magnetic head excellent in high frequency recording / reproducing characteristics, wear resistance, slidability, durability and mass productivity, and a magnetic recording / reproducing apparatus using the same.

[Conventional technology]

At present, a metal magnetic material having a coercive force of more than 1000 Oe has come to be used as a magnetic recording medium in a high density magnetic recording / reproducing apparatus. In order to record sufficient information on this magnetic recording medium, the conventional ferrite magnetic head is insufficient in capacity because the saturation magnetic flux density of the ferrite is low.
Amorphous magnetic alloy film-ferrite composite type magnetic heads as described in JP-A Nos. 606, 58-155513 and 58-98824 are used. This magnetic head has a structure in which a pair of magnetic head cores made of an amorphous magnetic alloy film formed on a ferrite magnetic support are joined with a low temperature softening glass via a non-magnetic gap material.

Since this amorphous magnetic alloy has a higher saturation magnetic flux density and a higher magnetic susceptibility than ferrite, the magnetic head using it has remarkably excellent recording / reproducing characteristics than the conventional ferrite magnetic head. As the material of the amorphous magnetic alloy film for the magnetic head, an amorphous alloy containing Co as a main component is used. In addition, since the magnetic head core must be joined at a temperature at which the amorphous magnetic alloy does not crystallize, the low-temperature softening containing PbO as the main component, which has a significantly lower working temperature than the glass used for conventional ferrite magnetic heads, is used. Glass is used. However, this amorphous magnetic alloy film-ferrite composite type magnetic head has the following problems in performance.

(1) Large sliding noise is generated in the high frequency region.

(2) If the number of windings of the exciting coil is increased, the inductance increases, and therefore the number of windings cannot be increased.

(3) The boundary portion between the amorphous magnetic alloy film and the ferrite may act as a pseudo gear trap.

The above problem is caused by using ferrite for the magnetic head material, and can be solved by replacing the portion using ferrite with a non-magnetic material. As this type of magnetic head, there is an amorphous magnetic alloy film-nonmagnetic material composite type magnetic head as described in JP-A-59-142716.
Further, in this type of magnetic head, an amorphous magnetic alloy film and a non-magnetic insulator film are alternately laminated to form a multi-layer structure in order to obtain suitable recording / reproducing characteristics in a high frequency region. The non-magnetic material that is the support for forming the amorphous magnetic alloy film includes
Since it is necessary to have abrasion resistance with respect to the metal tape, among ceramics, hard glass, etc. having abrasion resistance equal to or higher than that of ferrite, one having a coefficient of thermal expansion close to that of the amorphous magnetic alloy is preferable. in use. If this difference in thermal expansion coefficient is significant, problems such as peeling of the amorphous magnetic alloy film occur.

[Problems to be Solved by the Invention]

The amorphous magnetic alloy film-nonmagnetic material composite type magnetic head has better recording and reproducing characteristics in a wide band than the conventional ferrite magnetic head, and further, the amorphous magnetic alloy film-ferrite composite type magnetic head. The feature is that sliding noise is small.

However, no non-magnetic support material and bonding glass suitable for this magnetic head have been found.

At present, as a support, non-magnetic ferrite, Al ₂ O ₃ ,
Although low-temperature softened glass containing PbO as a main component is used as the bonding glass such as high-temperature softened glass, the production yield of the magnetic head is poor and the reliability of the magnetic head is lacking with this combination. In the future, in order to improve the performance of the recording / reproducing apparatus, when a metal tape is used and runs at a remarkably high speed with respect to the magnetic head, it is necessary to remarkably improve the reliability of the magnetic head, that is, the durability. . The non-magnetic material used in the amorphous magnetic alloy film-non-magnetic material composite type magnetic head is considered only in wear resistance and thermal expansion coefficient, but it is difficult to process, slidability with a metal tape, etc. Also needs to be considered.

For example, Al ₂ O ₃ is too hard to damage the metal tape, and high-temperature softened glass is fragile, resulting in poor workability. Non-magnetic ferrite does not have a problem when the metal tape runs at a low speed, but has a problem that it is easily worn when running at a high speed. Although low-temperature softened glass containing PbO as a main component is used as the bonding glass, there are problems such as a large coefficient of thermal expansion, low strength and hardness, and poor water resistance.

An object of the present invention is to provide a magnetic head excellent in high frequency recording / reproducing characteristics, wear resistance, slidability, durability and mass productivity by using a non-magnetic material and a bonding glass suitable for solving the above problems. It is in.

[Means for solving the problem]

Briefly describing the present invention, the first invention of the present invention relates to a magnetic head, in which a pair of magnetic head cores made of an amorphous magnetic alloy film formed on a non-magnetic support is provided with a non-magnetic gear gap material. In a magnetic head which is butted to each other and joined with glass, the non-magnetic support is composed of cubic ZrO ₂ as a main material and contains 0.01 to 1.0% by weight of C and has an average crystal grain size of 3 μm or less. Consisting of a body, and the bonding glass has a coefficient of thermal expansion of 75 to 95 × 10 ⁻⁷ / ° C.,
It is characterized by being made of an oxide glass composed of at least vanadium, phosphorus and antimony.

A second invention of the present invention relates to a magnetic recording / reproducing apparatus, in which a magnetic tape is wound obliquely around an outer peripheral portion of a drum containing a rotating magnetic head, and a predetermined tilt angle with respect to the longitudinal direction of the magnetic tape. In the magnetic recording / reproducing apparatus for forming a magnetic recording pattern having the above and recording / reproducing a signal, the magnetic head is the magnetic head of the first invention of the present invention.

The above-mentioned sintered body used as a non-magnetic support is, in terms of oxide, 10 mol% or less of Y ₂ O ₃ , 20 mol% or less of CaO, MgO and SrO, 30 mol% or less of CeO ₂ and 35 mol%. A highly densified sintered body which is easily obtained by containing at least one of the following La ₂ O ₃ and 0.01 to 1% by weight of C is preferable.

The aforementioned glass used as a bonding glass, 55 to 70% of V ₂ O ₅ by weight in terms of oxide, 17-25% of the P ₂ O ₅ and Sb ₂ O
Low temperature softened glass containing ₃ to 20% of 3 as an essential component is most suitable. In particular 55-65% of the V ₂ O _5, 18 to 22% of the P ₂ O ₅ and
5 to 12% of Sb ₂ O ₃ is preferable, 20% or less of PbO, Tl ₂ O
15% or less, 5% or less of Nb ₂ O ₅ , preferably ₃ to 5% of PbO.
It may contain 10%, 3-10% of Tl ₂ O, and 0.5-2% of Nb ₂ O ₅ .

As the above amorphous magnetic alloy film, an amorphous alloy containing Co as a main component, which has a high saturation magnetic flux density and a high magnetic permeability, is suitable, and further, a multi-layered structure is formed through this non-magnetic insulator film. Is preferred.

The magnetic head of the present invention is preferably used as a tape contact type magnetic head capable of sufficiently supporting a tape, particularly a metal tape.

The magnetic head according to the present invention has significantly improved or improved wear resistance, slidability, durability and mass productivity.

The non-magnetic support sintered body is very excellent in workability, wear resistance and slidability. This has an average grain size of 3μ
This is because when it is m or less, workability is good, and when it is made into a cubic crystal highly densified sintered body, wear resistance and slidability with respect to the metal tape are improved. This sintered body is Zr
As a stabilizer for making O ₂ into a cubic crystal at room temperature, Y ₂ O ₃ ,
It contains at least one of CaO, MgO, SrO, CeO ₂ and La ₂ O ₃ . When the amount of this stabilizer is small, tetragonal ZrO ₂ which is difficult to work is mixed, and workability and slidability are deteriorated.
However, if the amount of tetragonal ZrO ₂ is small, it does not cause much problem. Therefore, the proportion of cubic crystals is preferably 90 to 100%, and particularly preferably 100%. Further, in order to make the average crystal grain size of this sintered body 3 μm or less, this sintered body contains 0.01 to 1.0% by weight of C as a grain growth inhibitor. If the C content is less than 0.01% by weight, there is no effect, and if it exceeds 1.0% by weight, the porosity becomes large and a highly densified sintered body cannot be obtained. When the average crystal grain size of the terminated body exceeds 3 μm, chipping during processing becomes large, and the processing yield of the support is significantly reduced.

Furthermore, the non-magnetic support sintered body has a thermal expansion coefficient of 85 to
Although it is about 100 × 10 ^-7 / ° C, which is smaller than that of the amorphous magnetic alloy containing Co as a main component, the amorphous magnetic alloy film can be firmly formed by peeling without peeling, It hardly deteriorates the magnetic properties.

In order to prevent cracking, it is better to use a low-temperature softening glass for bonding that has a thermal expansion coefficient of 75 to 95 × 10 ^-7 / ° C, which is slightly smaller than the thermal expansion coefficient of the non-magnetic support sintered body. . In this respect, the low-temperature softened glass according to the present invention has a smaller coefficient of thermal expansion than the conventionally used low-temperature softened glass containing PbO as a main component, and a glass meeting the requirements can be obtained. Further, the low-temperature softened glass according to the present invention has higher strength and hardness than the conventionally known low-temperature softened glass, and is excellent in workability and water resistance.

Further, the magnetic head of the present invention uses a high saturation magnetic flux density and high magnetic permeability amorphous alloy film containing Co as a main component in the core material,
Further, by forming this amorphous alloy film into a multi-layer structure with a non-magnetic insulator film interposed therebetween, suitable recording / reproducing characteristics are exhibited in a wide band.

That is, a high-saturation magnetic flux density and high-permeability amorphous alloy film containing Co as a main component, and a high-density calcination mainly composed of cubic ZrO ₂ having an average crystal grain size of 3 μm or less for its non-magnetic support. Coefficient of thermal expansion for joining and magnetic head core joining is 75 to 95 ×
By combining three materials of low temperature softening glass whose main components are V ₂ O ₅ , P ₂ O ₅ and Sb ₂ O ₃ in the range of 10 ^-7 / ° C, slidability with metal tape and It is possible to manufacture a high-performance magnetic head in which the wear resistance of the magnetic head is remarkably superior to the conventional one, with a high yield.

The magnetic head of the present invention is particularly effective when an amorphous magnetic alloy is used for the core material, but it is used as a core material for a crystalline magnetic alloy such as sendust, permalloy, and alperm, and has a corresponding thermal expansion coefficient. You may join with the glass you have.

The device according to the present invention is suitable for a video tape recorder. This video tape recorder uses metal as a recording medium and is suitable for high-speed running.

 Hereinafter, the present invention will be specifically described.

FIG. 1 shows a perspective view of a typical magnetic head. Reference numerals 1 and 1 ′ are amorphous magnetic alloy films, and in the examples, Co ₈₃ —Nb ₁₃ —Zr, which is an amorphous alloy with high saturation magnetic flux density and high magnetic permeability.
₄ was used. Reference numerals 2 and 2'are non-magnetic supports for forming this amorphous magnetic alloy film. Reference numerals 3, 3'are low temperature softened glass used for joining magnetic head cores. 4, 4 '
Is composed of two layers, a protective film for preventing the low temperature softened glass from eroding the amorphous magnetic alloy film and a wettability improving film for sufficiently wetting the low temperature softened glass. Reference numeral 5 is a gear butting portion, which forms an operating gear via a non-magnetic insulating film. 6
Is a coil winding window.

The amorphous magnetic alloy film is preferably multi-layered with nonmagnetic insulator films 20, 20 ', 21, 21', 22, 22 'interposed therebetween, as shown in FIG. That is, FIG. 2 is a plan view of the sliding surface of the magnetic head of FIG.

Next, a method of manufacturing the magnetic head shown in FIG. 1 will be described. 3 to 6 are explanatory views of a series of steps in the method of manufacturing the magnetic head shown in FIG. In each figure, reference numeral 30 is a non-magnetic support substrate, 31 is a coil winding window groove, 32 is a track groove, 33 is an amorphous magnetic alloy film, 34 is a protective film, 35 is a wettability improving film, 36 Is low temperature softened glass, 37 and 38
Indicates a magnetic head core block, and 39 indicates a non-magnetic gear material.

A substrate used as a non-magnetic support, as shown in FIG.
A groove 31 for a coil winding window and a track groove 32 were provided in 30 to form a butt face of the gear. Next, as shown in FIG.
Co ₈₃ -Nb ₁₄ -Zr ₃ Amorphous alloy film 3
3, the protective film 34 and the wettability improving film 35 were sputtered in this order, and the track groove 32 was filled with a low temperature softening glass 36. Where Co
₈₃ -Nb ₁₄ -Zr ₃ since heat resistant temperature of 480 ° C. of amorphous alloy, glass filled at 460 ° C. KoTsuta. This amorphous alloy film is not a single layer as described above, but it is better to have a multilayer structure with a non-magnetic insulating film interposed. Next, as shown in FIG. 5, unnecessary low temperature softening glass and amorphous magnetic alloy film are removed to form a groove for the coil winding window and a required track width t on the butt face of the gear cup. A pair of magnetic head core blocks 37 and 38 were produced by cutting along the alternate long and short dash line A.

Note that the protective film 34 and the wettability improving film 35 are omitted in FIGS. The required amount of non-magnetic gear material 39 was sputtered on the gear mating surfaces of both core blocks 37 and 38, and they were butted as shown in FIG. 6 and joined at 460.degree. Next, the magnetic heads shown in FIG. 1 were manufactured by cutting along the dashed-dotted lines B and B '.

Representative examples suitable as the above non-magnetic support are shown in Table 1,
Table 2 shows typical examples that are not suitable. In addition, in Table 3,
The preliminary examination results of the supports shown in Tables 1 and 2 are shown. The crystal system of ZrO ₂ and the proportion of its crystal phase were examined by X-ray diffraction. The average crystal grain size is obtained by etching the polished surface of the support substrate and obtaining the average crystal grain size of about 200 crystal grains on the polished surface by the intercept method (code method) from the enlarged photograph. It is a three-dimensional average crystal grain size obtained by multiplying by a statistical coefficient of 1.56. The average chip size is the average size of the chips when the groove processing shown in FIG. 3 is performed. The processing yield is that when 100 pieces of the support processed into the shape and size of the magnetic head were to be produced, and the case where there was a chip of 5 μm or more was regarded as defective. The amount of wear was measured by mounting a support processed into the shape and size of a magnetic head on a VTR cylinder and running a metal tape at a relative speed of 5.8 m / sec for 300 hours to measure the amount of wear of the support. The slidability is measured by observing the tape running surface of the support used to measure the amount of wear,
That is, it was evaluated whether or not the magnetic recording medium or the organic binder for adhering it to the tape was recognized. When not observed, it was judged that the compatibility with the metal tape was good and the slidability was good.

The thermal expansion coefficients of the supports A to J and the supports (K) to (Q) were large to some extent, and the Co ₈₃ —Nb ₁₄ —Zr ₃ amorphous alloy was not peeled off even when sputtered. The supports A to J and the supports (K) to (M) are sintered bodies containing ZrO ₂ as a main material. The supports A to J are highly densified sintered bodies mainly composed of cubic ZrO ₂ having an average crystal grain size of 3 μm or less, and are excellent in workability, wear resistance and slidability. In particular, the B support is excellent. On the other hand, since the support (K) has a large average crystal grain size, it has a large chipping during processing and has poor processability. The support (L) has a high porosity, that is, it is not highly densified, the magnetic recording medium is caught in the pores, and the slidability is poor. (M) support is difficult to work Tetragonal Zr
Since it contains 25% by weight of O ₂ , workability is poor. (N) ~
The support (Q) is not a sintered body containing ZrO ₂ as a main material.
Since the supports (N) and (O) are too hard, the metal tape is damaged. Since the supports of (P) and (O) are soft,
Wear resistance is poor. The support (Q) is a magnetic material used in conventional ferrite magnetic heads and amorphous magnetic alloy-ferrite composite type magnetic heads, and thus is essentially unsuitable in the present invention. It is effective in comparing wear resistance and slidability. This and A ~
Comparing the J supports, the A to J supports have a Micro Vickers hardness of 1000 to 1500, are extremely excellent in wear resistance, and contribute to prolonging the life of the magnetic head.

 Table 4 shows the composition and characteristics of typical bonded glass.

The bonded glass of a to e is a low temperature softened glass containing V ₂ O ₅ as a main component, and the bonded glass of (f) is a general low temperature softened glass containing PbO as a main component, which is used for comparison. I was there. These bonded glasses have low characteristic points measured by DTA and can be filled and bonded at 460 ° C. The bonded glasses of a to e have a smaller coefficient of thermal expansion than the bonded glass of (f), and can be matched with the coefficient of thermal expansion of the support shown in Table 1 above. Generally, the coefficient of thermal expansion of the bonded glass is preferably smaller than that of the support. In particular, when the bonded glass has a larger thermal expansion coefficient than the support, such as the bonded glass of (f), tensile stress is applied to the glass, the glass is easily broken, and the manufacturing yield of the magnetic head is poor. Also,
The bonded glass of a to e has a 4-point bending strength of 4.5 kgf / mm ² or more,
It has a hardness of 300 or more, and has higher strength and hardness than the bonded glass of (f). The chip strength of the magnetic head largely depends on the strength of the bonded glass. Generally, since glass has no grain boundary, it has good slidability, and the wear resistance of glass largely depends on hardness. Therefore, the bonded glasses a to e can improve or improve the durability of the magnetic head. Water resistance is the weight loss per unit weight (mg / g) when a glass piece processed into a cube of 5 × 5 × 5 mm is put in 40 cc. Of distilled water and heated at 70 ° C. for 2 hours. 1mg / g for bonded glass
In the following, water resistance is remarkably superior to that of the bonded glass of (f),
The reliability of the magnetic head can be improved or improved.

〔Example〕

Hereinafter, the present invention will be described more specifically with reference to Examples, but the present invention is not limited to these Examples.

The magnetic heads shown in FIG. 1 were prepared and evaluated using the supports shown in Table 1 or 2 and the bonded glass shown in Table 4.

Example 1 The magnetic head shown in FIG. 1 was prepared by combining the support and the bonded glass shown in Table 5. The evaluation of the obtained magnetic head is also shown in Table 5. Here, the head manufacturing yield is the processing yield when manufacturing the magnetic head. The average head chip strength is a measure of how much load the obtained magnetic head chip breaks. The amount of wear was obtained by attaching the obtained magnetic head to the VTR cylinder and running the metal tape at a relative speed of 5.8 m / sec for 300 hours.
The amount of wear of the magnetic head was measured.

With the combination of the support B and the bonded glass (f), the head production yield and the average head chip strength are extremely low. This is because the coefficient of thermal expansion of the bonded glass (f) is much larger than that of the support B, and thus cracks are easily introduced into the bonded glass (f).

Support (P) and bonded glass (f), and support (Q)
The average head chip strength is low and the amount of wear is very large in the combination of the above and the bonded glass (f). This is because the strength of the bonding glass (f) is low and the amounts of wear of the supports (P) and (Q) are large. When the bonding glass d having higher strength and hardness than the bonding glass (f) is used and combined with the support (Q), the head manufacturing yield, the average head chip strength and the abrasion resistance are remarkably improved.

In contrast to the comparative example, in the example, by combining the support B and the bonding glasses a to e, respectively, the head manufacturing yield, the average head chip strength and the abrasion resistance are very excellent. Above all, excellent results are obtained especially in combination with the bonding glass e.

Further, as for the slidability of the magnetic heads produced by the combinations shown in Table 5, good results were obtained because the supports B, (P) and (Q) having good slidability were used. However, when the bonded glass (f) is used, the amount of wear of this glass is remarkable and the dent in the bonded glass portion is large.

Regarding the performance, good recording and reproducing characteristics were shown in a wide band when the non-magnetic supports B and (P) were used irrespective of the bonded glass, but when the magnetic support (Q) was used, high frequency was achieved. Generates sliding noise in the area.

From the above, the magnetic heads of the examples in Table 5 satisfy all of these characteristics with respect to high frequency recording / reproducing characteristics, wear resistance, slidability, durability and mass productivity.

Example 2 Supports A and C to J shown in Table 1 and bonded glass e
In combination, the magnetic head of FIG. 1 was produced. Table 6 shows the respective evaluation results. The evaluation method is the same as in Example 1.

The nine types of magnetic heads thus obtained have high head manufacturing yield and average head chip strength, and have a small amount of wear, and are excellent in wear resistance. Moreover, since a support having good slidability is used, good sliding results can be obtained. There was no problem with performance.

Embodiment 3 FIG. 7 is a perspective view of a rotating portion of a magnetic recording / reproducing apparatus.

That is, the rotary magnetic head device 41 used in the video tape recorder has a rotary disk 42 which rotates in the direction of arrow A as shown in FIG.
Upper and lower drums 43 and 44, which are fixed to the chassis of the video tape recorder, are arranged above and below 42. The motor 45 drives the rotary disc 42 to rotate. The magnetic tape 46 is obliquely wound around the upper and lower drums 43, 44, etc. within an angle range of about 180 °, and is run in the direction of arrow B. In order to keep the position of the magnetic tape 46 with respect to the rotary head device 41 constant, a guide pole 47,
A step portion 49 of the lower drum 44 and the lower drum 44 are provided. Also,
Two magnetic heads 50 are provided, for example, and they are mounted on the rotary disk 42 at an angle of 180 ° with respect to each other. The tip of the head chip of the magnetic head 50 slightly projects from the outer peripheral surfaces of the upper and lower drums 43, 44, etc., and the sliding contact with the magnetic tape 46 causes the recording and reproduction of the video signal.

With the magnetic head rotating in this manner, the magnetic tape 46
As shown in FIG. 8, recording tracks T are sequentially formed on the upper side in an oblique manner. These recording tracks T are formed when the magnetic tape 46 is driven to travel in the direction of arrow B at a constant speed V ₀ , and the head chip 11 is on the straight line l ₀ during normal reproduction (normal reproduction). A normal video signal is reproduced by moving the.

In such a magnetic recording / reproducing apparatus, the magnetic head 50
Then, the structure shown in FIG. 1 was manufactured. The composition of No. A in Table 1, the above Co-based alloy amorphous magnetic film and the bonding glass of No. a in Table 4 were used for the magnetic head support. As a result of attaching this magnetic head to the VTR cylinder and running the metal tape at a relative speed of 5.8 m / sec for 300 hours,
The amount of wear was 0.3 μm or less, the slidability was good, and the average chip size was 3 μm or less.

〔The invention's effect〕

According to the present invention, a magnetic head core made of an amorphous alloy film having a high saturation magnetic flux density and a high magnetic permeability, which enables sufficient recording / reproduction even on a recording medium having a high coercive force, and a non-magnetic core which forms this amorphous alloy. The magnetic support has cubic ZrO ₂ as the main material and is a highly densified sintered body with an average grain size of 3 μm or less. Also, the thermal expansion coefficient of the bonded glass of the magnetic head core is in the range of 75 to 95 × 10 ^-7 / ° C. By using a combination of low temperature softened glass in
It is possible to provide a high-reliability and high-performance magnetic head excellent in high-frequency recording / reproducing characteristics, wear resistance, slidability, durability and mass productivity.

[Brief description of drawings]

1 is a perspective view of a magnetic head in an embodiment of the present invention, FIG. 2 is a plan view of a sliding surface of the magnetic head of FIG. 1, and FIGS. 3 to 6 are magnetic heads of FIG. FIG. 7 is an explanatory view of each step in the manufacturing method, FIG. 7 is a perspective view of a rotating portion of the magnetic recording / reproducing apparatus, and FIG. 8 is a plan view showing a recording track on the magnetic tape. 1, 1 ', 33: Amorphous magnetic alloy film, 2, 2': Non-magnetic support, 3, 3 ', 36: Low temperature softened glass, 6: Coil winding window, 20, 20', 21, 21 ', 22, 22': non-magnetic insulating film,
30: non-magnetic support substrate, 31: coil winding window groove, 32: track groove, 4, 4 ′, 34: protective film, 35: wettability improving film, 3
7, 38: Magnetic head core block, 39: Non-magnetic cup material, 4
1: rotating magnetic head device, 42: rotating disk, 43: upper drum, 44: lower drum, 45: motor, 46: magnetic tape, 47, 48:
Guide pole, 49: Lower drum step, 50: Magnetic head, 1
1: Head chip

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Seiichi Yamada, 4026 Kujimachi, Hitachi, Hitachi, Ibaraki Prefecture, Hitachi Research Laboratory, Ltd. (72) Kunihiro Maeda, 4026, Kujimachi, Hitachi, Hitachi, Hitachi, Ltd. In-house (72) Climbing Kumasaka 1-280 Higashi Koigokubo, Kokubunji, Tokyo Inside Central Research Laboratory, Hitachi, Ltd. (72) Kenkichi Inada 1410 Inada, Katsuta-shi, Ibaraki Stock Company Hitachi Ltd. Tokai Plant (56 ) Reference JP 63-25824 (JP, A) JP 63-20705 (JP, A) JP 61-190703 (JP, A) JP 63-134562 (JP, A)

Claims (10)

(57) [Claims] 1. A magnetic head in which a pair of magnetic head cores made of an amorphous magnetic alloy film formed on a non-magnetic support are butted against each other via a non-magnetic gap material and bonded with glass. The main body is cubic ZrO ₂ and contains 0.01 to 1.0% by weight of C. Average grain size 3
The sintered glass having a size of less than or equal to μm, and the bonded glass is made of an oxide glass having a coefficient of thermal expansion of 75 to 95 × 10 ⁻⁷ / ° C. and at least vanadium, phosphorus and antimony. Magnetic head. 2. The sintered body contains 10 mol% or less of Y ₂ O ₃ , 20 mol% or less of CaO, MgO and SrO, and 36 mol% or less of CeO ₂ and 35 mol% in terms of oxides. The magnetic head according to claim 1, which contains at least one metal corresponding to an oxide selected from the group consisting of La ₂ O ₃ below. Wherein said bonding glass are each from 55 to 70% of V ₂ O ₅ by weight in terms of oxide, of from 17 to 25% and Sb ₂ O ₃ of P ₂ O ₅ 3~2
The magnetic head according to claim 1 or 2, which is a glass containing 0% as an essential component. 4. The magnetic head according to claim 1, wherein the amorphous magnetic alloy film is an amorphous alloy film containing Co as a main component. 5. The magnetic head according to claim 1, wherein the amorphous magnetic alloy film is multilayered with a nonmagnetic insulating film interposed therebetween. 6. The magnetic head according to claim 1, wherein the magnetic head is a tape contact type magnetic head used for a tape using a magnetic magnetic material having a high coercive force as a magnetic recording medium. 7. The magnetic material according to claim 1, wherein the non-magnetic support is made of a ceramics sintered body having a Micro Vickers hardness of 1000 to 1500 and an average crystal grain size of 3 μm or less. Head. 8. A magnetic tape is obliquely wound around an outer peripheral portion of a drum containing a rotating magnetic head to form a magnetic recording pattern having a predetermined inclination angle with respect to the longitudinal direction of the magnetic tape,
In a magnetic recording / reproducing apparatus for recording / reproducing signals, a pair of magnetic head cores made of an amorphous magnetic alloy film formed on a non-magnetic support are butted against each other through a non-magnetic gear material. The non-magnetic support is joined with glass, and the non-magnetic support is composed of a sintered body containing cubic ZrO ₂ as a main material and containing 0.01 to 1.0% by weight of C and having an average crystal grain size of 3 μm or less, and the joined glass is Coefficient of thermal expansion 75 to 95 × 10 ^-7 /
A magnetic recording / reproducing apparatus characterized by comprising an oxide-based glass composed of at least vanadium, phosphorus, and antimony within a range of ° C. 9. The non-magnetic support has a micro-Vickers hardness of 1000 to 1500 and is composed mainly of cubic ZrO ₂ as a main component, and Y ₂ O ₃ , CaO, MgO, SrO, CeO ₂ , La. 9. The magnetic recording / reproducing apparatus according to claim 8, which is made of a ceramics sintered body having an average crystal grain size of 3 μm or less containing at least one of ₂ O ₃ . 10. The sintered body has a molar ratio of ZrO ₂ of 55.
~ 70% zirconium, Y ₂ O ₃ 10% or less yttrium, CaO, MgO and SrO 20% or less each of calcium, magnesium and strontium, CeO ₂
30% or less when converted to 35% when converted to La ₂ O ₃
The magnetic recording / reproducing apparatus according to claim 9, comprising at least one of the following lanterns.