JPS61198411A - Thin film magnetic head - Google Patents

Abstract

PURPOSE:To attain ease of adjustment by forming a recording thin film magnetic head group and a reproducing thin film magnetic head group at a position opposed together at the base. CONSTITUTION:Since the relation of position between a recording head group 2a and a reproducing head group 6b and between the recording head group 2b and a reproducing head group 6b is decided respectively by patterns in forming each thin film head group, the adjustment for mounting is very easier than that of a conventional thin film magnetic head. Further, in executing recording the recording head group 2a, since the reproducing head group 6b scans onto the magnetic head 5 with a delay from the recording head group 2a, the reproduction just after recording, that is, monitoring is attained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a thin film magnetic head, and in particular, for example, a PCM magnetic head.
(Pulse code modulation) This invention relates to a thin film magnetic head used in a recording/reproducing device.

(Prior Art) In recent years, with the development of electronic technology, devices that are capable of recording and reproducing information signals with high quality and high fidelity have appeared. An example of this device is a PCM recording and reproducing device, that is, a device that converts an analog signal such as an audio signal into a digital signal and performs recording and reproducing on a recording medium such as a magnetic recording medium. There are two types of devices: those that use a rotary head to perform recording and reproduction, and those that use a rotary head to perform recording and reproduction.

In the case of the fixed head method described above, for example, the quality of the transmitted audio signal is as follows: Number of transmission channels: 2 channels, Number of transmission bits per channel: 16 bits, Sampling frequency: 44.1k) (If z or more, the total transmission rate of this audio signal will be 2MBPS (2M bits per second) or more, so in order to perform stable recording and playback, multiple tracks should be provided and the transmission rate per track should be increased. Therefore, in the case of the fixed head method described above, it is necessary to perform recording and reproduction using a plurality of tracks, that is, multi-track recording and reproduction.

Further, a conventional wire-wound recording head may be used as a recording/reproducing head for multi-track recording/reproducing, but since the number of tracks is large, it is difficult to connect the recording/reproducing head to the signal processing circuit/drive circuit, or to connect the head. Considering the demands for higher productivity and higher recording density, conventional IC (integrated circuit) process techniques, especially vapor deposition, sputtering, carbon
Recording and reproducing using a multi-track recording or reproducing head in which multiple recording or reproducing heads are integrally formed with a thin film magnetic head formed using thin film production technology such as VD and microfabrication technology such as dry etching. It is desirable to do this.

The thin-film magnetic head described above can have narrower tracks and more tracks than conventional monolithic magnetic heads, and also has steep recording leakage flux and excellent short-wavelength recording and reproducing characteristics, making it possible to achieve high recording densities. Suitable for densification.

Furthermore, in terms of productivity, since a wafer process is used, mass productivity is excellent, and homogeneous thin film magnetic heads can be produced.

For these reasons, in recording and reproducing devices that perform PCM recording and reproducing of audio signals, a multi-element i1 film magnetic head is usually used as a magnetic head for recording and reproducing, and a magnetic induction type thin film magnetic head is used for recording. Furthermore, a magnetoresistive magnetic head is used for reproduction.

FIG. 2 is a diagram showing an example of a conventional thin film magnetic head, in which 1 is a substrate made of, for example, a magnetic material, and one end of one surface of the substrate 1 is coated with evaporation, sputtering, CVD, etc. A recording head group 2 is formed, which is composed of a plurality of independent thin film magnetic heads for recording (for example, magnetic induction type thin film magnetic heads) using thin film fabrication technology, microfabrication technology such as dry etching, etc. At the other end of the surface on which the recording head group 2 is formed, there is a terminal group 3 for supplying recording signals from an external recording system signal processing circuit (not shown in FIG. 2) to the recording head group 2. are formed in a number corresponding to the recording head group 2, and furthermore, a lead pattern group is formed between the recording head group 2 and the terminal group 3 for electrically connecting between the recording head group 2 and the terminal group 3. 4 is formed.

5 is a recording medium such as a magnetic tape, and the magnetic tape 5 shown in FIG. 2 is a cross section taken perpendicularly to the longitudinal direction of the magnetic tape 5. In other words, the running direction of the magnetic tape 5 is toward the front or toward the back of the plane of the drawing.

Furthermore, as is clear from FIG.
A plurality of recording tracks are formed by the recording head group 2.

Furthermore, the reproducing head group was formed on a substrate different from the substrate 1 on which the recording head group 2 was formed in the same manner as the recording head group 2 described above, and was arranged separately from the recording head group.

(Problems to be solved) However, when recording and reproducing using a conventional thin film magnetic head, the recording head group 2 and the
The height, azimuth, and
It is necessary to adjust the positional relationship between the magnetic tape 5 and the thin film magnetic head, such as rotation or tilt.

To perform this adjustment, after recording on the magnetic tape 5 with the recording head group 2, the magnetic tape 5 is rewound and reproduced with the reproducing head group, and the mounting position of the thin film magnetic head is adjusted based on the reproduction signal. Since it is necessary to repeatedly perform the operations of recording, reproducing, and making adjustments, there are problems in that there are many adjustment points, the time required for adjustment is long, and the adjustment accuracy is poor.

Therefore, in order to solve the problems of the conventional thin film magnetic head shown in FIG. 2, the applicant formed a thin film magnetic head as shown in FIG. 3.

In other words, the thin film magnetic head shown in FIG. 3 has one end (the end on the sliding contact side of the magnetic tape 5) of the portion B on the substrate 1 shown in FIG. 2 where the recording head group 2 is not formed. 1n for independent reproduction, the number corresponding to the recording head group 2.
rva air head (e.g. magnetoresistive thin film magnetic head)
A reproducing head group 6 consisting of the following is formed in the same manner as in the case of forming the recording head group 2 shown in FIG.
At the other end of part B, there is a signal processing circuit (not shown in FIG. 3) for reproducing the reproduction signal reproduced by the reproduction head group 6.
A number of terminal groups 3 corresponding to the number of read head groups 6 were formed for outputting data to the read head group 6, etc., and a lead pattern group 4 for electrical connection between the read head group 6 and the terminal group 3 was formed.

FIG. 4 shows the thin film magnetic head shown in FIG.
FIG.

During recording, recording is performed by forming a plurality of recording tracks on the magnetic tape 5 using the recording head group 2, and during reproduction, the thin film magnetic head shown in FIG. 3 is rotated 180 degrees (that is, the recording head Group 2 and playback head group 6
(the vertical positional relationship with the magnetic tape 5 is opposite to that in FIG. 4), the recording information is reproduced by scanning a plurality of recording tracks formed on the magnetic tape 5 with the recording head group 2 using the reproduction head group 6. . In the above-mentioned thin film magnetic head, by aligning the positional relationship between the formation pattern of the recording head group 2 and the formation pattern of the reproducing head group 6, adjustments regarding mounting can be made by adjusting the formation of the recording head group 2 when the substrate 1 is rotated. Since all that is required is adjusting the position of the central axis that rotates the substrate 1 so that the recorded records 1 to 6 can be scanned by the read head group 6, the installation adjustment is easier than with the conventional thin-film magnetic head shown in Fig. 2. become.

However, when using the 111Va air head shown in Figures 3 and 4, it is necessary to rotate the thin film magnetic head 180 degrees from the recording position during playback as described above, so there is a large amount of space around the thin film magnetic head. It is necessary to secure a space for rotation, a large amount of mounting space is required, and, as mentioned above, it is necessary to provide a mechanism for rotating the substrate 1 during recording and reproduction. The problem was that it was difficult to achieve this goal and costs increased.

Therefore, the present invention forms a recording thin-film magnetic head group and a reproducing thin-film magnetic head group at opposite positions with the substrate as the center, thereby facilitating adjustment and simultaneous recording and reproducing.
An object of the present invention is to provide a thin film magnetic head that can reduce costs.

(Means for Solving the Problems) The present invention provides a thin film magnetic head as shown in FIG. 1 in order to solve the above problems.

FIG. 1 is a diagram for explaining one embodiment of the thin film magnetic head according to the present invention. The thin film magnetic head shown in FIG. 1 includes: a substrate 1 made of a magnetic material or a non-magnetic material; A recording thin-film magnetic head group 2a or 2b formed on one surface of the recording thin-film magnetic head group 2a or 2b facing the recording thin-film magnetic head group 2a or 2b with the substrate 1 as the center.
The recording head 6a or 6b is formed at a position to scan the recording track formed by the magnetic head 6a or 6b.

(Embodiment) FIG. 1 is a diagram showing an embodiment of the thin film magnetic head according to the present invention. FIG. 1 is a view of the thin film magnetic head viewed from the recording surface of the magnetic tape 5, similar to FIG. be.

Further, in FIG. 1, the same components as in FIG. 4 are given the same reference numerals, and their explanations will be omitted.

As shown in FIG. 1, a recording head group 2a consisting of a plurality of independent recording thin film magnetic heads (for example, magnetic induction type thin film magnetic heads) is disposed at one end of one surface of the substrate 1; A number of thin-film magnetic heads for reproduction (for example, magnetic Resistance type thin WAf!
A playback head group 6a consisting of a magnetic tape head (i.e., an optical head) is applied to each portion corresponding to approximately the width of the magnetic tape 5 using thin film forming techniques such as evaporation, sputtering, and CvD.

The substrate 1 is formed using microfabrication technology such as etching.
On the other side of the recording head group 2a, a number of independent reproducing disks corresponding to the position where the recording head group 2a is formed, and a number corresponding to the recording head group 2a are placed at a position where the recording track formed by the recording head group 2a is scanned. A read head group 6a consisting of an 11 m1 magnetic head (for example, a magnetoresistive thin film magnetic head) is formed, and a write head group 2b is placed at a position corresponding to the position where the read head group 6b is formed. 2a and the read head group 6b are formed in the same manner as in the case of forming the read head group 6b.

Further, the terminal group 3 and the lead pattern group 4 are formed on both sides of the substrate 1 using a forming method similar to that of the thin film magnetic head shown in FIG.

Next, recording and reproduction using the thin film magnetic head shown in FIG. 1 will be explained.

During recording, the terminal group 3 is connected to the recording head group 2a.
Recording is performed by supplying a recording signal to the magnetic tape 5 to form a plurality of recording tracks on the portion C shown in FIG. Reproduction head group 6 formed on the back surface of head group 2a
Recorded information is reproduced by scanning a plurality of recording tracks formed on the magnetic tape 5 with the recording head group 2a.

In addition, the portion D shown in FIG. 1 (approximately the width of the magnetic tape 5 +
The case where recording/reproducing is performed in the width (width) is similar to the case where recording/reproducing is performed in the portion C described above, and in this case, the recording head group 2b and the reproducing head group 6b are used.

Therefore, when recording and reproducing using the thin film magnetic head shown in FIG. 1, unlike the case shown in FIG. 4, there is no need to rotate the thin film magnetic head 180 degrees.

Furthermore, since the positional relationship between the recording head group 2a and the reproducing head group 6b and the recording head group 2b and reproducing head group 6a is determined by the pattern when forming each thin film head group, compared to the conventional thin film magnetic head, This makes installation adjustments extremely easy.

Further, for example, when recording is performed using the recording head group 2a, the reproducing head group 6b scans the magnetic tape 5 later than the recording head group 2a, so that reproduction can be performed immediately after recording. In other words, it can be monitored.

Furthermore, when recording and reproducing the portions C and D shown in FIG. 1, if the running direction of the magnetic tape 5 is reversed, reciprocating recording and reproducing is possible. It is also possible to perform simultaneous recording on portions C and D shown in FIG. desirable.

Note that instead of forming the recording and reproducing head groups on both sides of the substrate 1 as shown in FIG. 1, the same recording and reproducing head groups are formed on one side of each of the substrates 1a and 1b as shown in FIG. The substrates 1a and 1b are formed in the process steps of
By combining (joining) the other surfaces on which the recording/reproducing head group is not formed, 1WllIi
It may also be configured as an air head.

In this case, when combining the two substrates 1a and 1b, if the positional relationship between the recording head group 2a and the reproducing head group 6a and the positional relationship between the recording head group 2b and the reproducing head group 6b are matched, the substrate 1a The uneven thickness of 1b and the adhesive thickness do not pose any practical problems.

Furthermore, the thin film magnetic head shown in FIG.
a and the read head group 6b, the write head group 2b, and the read head group 6a are formed using the same process, but because they are formed separately, when forming the head group on one substrate, the head group 6a is formed on the other substrate. (Furthermore, since the distance between the recording head group 2a or 2b and the reproducing head group 6a or 6b is larger than that of the thin-film magnetic head shown in FIG. 1, This makes it easier to prevent crosstalk and the like.

(Effects of the Invention) Since the present invention has the above-described configuration, the recording head group and the reproducing head group are formed at opposite positions with the substrate in between, and the mutual positional relationship is such that the recording head group and the reproducing head group form the recording and reproducing head group. Therefore, by adjusting only the playback head, the position of the recording head group will naturally match, reducing the number of adjustment points, reducing the time required for adjustment, and improving adjustment accuracy. Also, when recording or reproducing, the position of the recording or reproducing thin film magnetic head group is adjusted to 180 degrees.
Recording and playback can be performed without having to be rotated or changed, requiring less installation space, and no rotation-related mechanism is required, resulting in high reliability and cost reduction. It has the advantage of

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of a thin film magnetic head according to the present invention, FIG. 2 is a diagram showing an example of a conventional thin film magnetic head, and FIGS. FIG. 5 is a diagram showing a thin film magnetic head formed to solve the problems of the thin film magnetic head shown above, and FIG. 5 is a diagram showing another embodiment of the thin film magnetic head according to the present invention. 1, 1a, 1b...Substrate, 2, 2a, 2b...
- Recording head group, 3... terminal group, 4... lead pattern group, 5... magnetic tape, 6.6a, 6b...
Playback head group. "l'1Fi1 72 Figure 7 :3 Procedural amendment 1, Indication of the case 1985 Patent Application No. 20513 2, Name of the invention Thin am air head 3, Person making the amendment Relationship with the case Patent applicant address: 3-12 Moriya-cho, Kanayō-ku, Yokohama-shi, Kanagawa (
1) "Reverse" written on page 13, line 4 is corrected to "on the contrary."

Claims (1)

[Scope of Claims] A substrate made of a magnetic material or a non-magnetic material, a group of thin film magnetic recording heads formed on one surface of the substrate, and a group of thin film magnetic heads for recording facing the group of thin film magnetic heads for recording with the substrate as the center. and a reproducing thin-film magnetic head formed at a position to scan the recording track formed by the recording thin-film magnetic head group.