JPS62128008A - Composite magnetic head - Google Patents

Abstract

PURPOSE:To reduce cost and man-hours by recording a video signal to the surface layer part of a magnetic tape with the 1st cores consisting of a high permeability magnetic material, forming the 2nd cores of a magnetic material consisting of a high magnetic flux density high permeability material on the progression side of the tracks for recording by the 1st cores and recording an audio signal to the deep layer part of the magnetic tape. CONSTITUTION:The high permeability magnetic material cores 1 consisting of ferrite, etc. are butted at a prescribed gap length gv to form the 1st tracks TVR, TVL for recording the video signal. The 2nd magnetic material cores 2 consisting of the high magnetic flux density high permeability material are butted at a gap length gA of the side faces of the progression side of the tracks TVR, TVL to form the 2nd tracks TAR, TAL for recording the audio signal. These cores are adhered and fixed by glass 3 by which the composite magnetic head having two functions is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a so-called deep recording magnetic head that records audio signals in the deep layer of a magnetic tape and records video signals in the surface layer of the magnetic tape.

[Technical Background of the Invention] A so-called deep recording type VTR records audio signals in the deep layer of a magnetic tape and records video signals in the surface layer.
As shown in FIG. 4, a video tape recorder (video tape recorder) usually has two video heads 12a and 12b placed on a rotating cylinder 11 and facing each other at 180', and this video head 12a.
, 12b and 1 in the same way at a position advanced by a predetermined angle θ.
Two audio heads L3a, 13 facing each other at 80°
Recording is performed using a total of four magnetic heads b.

These four magnetic heads 12a, 12b, 13a,
The positional relationship of the video heads 13b is not limited to the above-mentioned positional relationship of facing the video heads 12a and 13b, as shown in FIG.
The centers of tracks TVR and TVL of audio heads 13a and 13b coincide with each other, and the centers of tracks TA of audio heads 13a and 13b match.
The centers of R and TAL are arranged so as to be separated by a predetermined step Δh.

FIG. 6 shows the state of the tape pattern, and so-called deep recording is realized in which video tracks TVL and TVR having different azimuth angles are formed on audio dosec TAR and TAL.

FIG. 7 shows the tape having the tape pattern shown in FIG. 6 cut. As is clear from FIG. 7, there are audio tracks TAR and TAL as an audio recording section +01 on the base 100 of the tape, and video tracks TVR and TVL as a video recording section 102 on the surface thereof.

[Problems with the background technology] As described above, in the conventional deep recording method, audio signals are recorded in the deep layer and video signals are recorded in the surface layer.
In addition to the video heads L2a and 12b, the audio heads 13a and 13b are required, leading to an increase in cost, and the cylinder assembly requires regularization of the relative positions of the four magnetic heads, making assembly complicated and requiring a large amount of man-hours. shall be.

[Object of the Invention] This invention was made to eliminate the above-mentioned conventional drawbacks, and provides a composite magnetic head that can reduce the cost of the magnetic head, facilitate cylinder assembly, and reduce the number of man-hours. The purpose is to

[Summary of the Invention] The composite magnetic head of the present invention is a magnetic head used in a helical scanning video tape recorder that records signals diagonally on a magnetic tape using two magnetic heads rotating 180 degrees opposite each other. A video signal is recorded on the surface layer of the magnetic tape by the TSL core of the body, and a second core is formed of a magnetic material made of a high magnetic flux density and high magnetic permeability material on the advancing side of the track recorded by the first core. The audio signal is recorded deep inside the magnetic tape.

[Embodiments of the Invention] Examples of the composite magnetic head of the present invention will be described below with reference to the drawings. 1A and 1S are front views of one embodiment thereof, and FIG. 1S shows a magnetic head having an opposite azimuth to the magnetic head of FIG. 1A.

In both FIGS. 1A and 1S, a high permeability magnetic core 1 made of ferrite or the like has a predetermined gap length g.
The first tracks TVR and TVL for recording video signals are formed.

Furthermore, a second magnetic core 2 made of a high magnetic flux density and high permeability material such as sendust, permalloy, amorphous, etc. is butted against the advancing side of the tracks TVR and TVL with a gap length gA, and records audio signals. The second track TAR.

A TAL is formed and adhesively fixed with glass 3 to form a composite magnetic head having two functions.

FIG. 2 is an explanatory diagram of the functions of the composite magnetic head of the present invention.
When a video signal and an audio signal are passed through the magnetic head shown in FIG. 1A, an audio track TAR extending to the deep layer of the magnetic tape 5 and a video track TVR extending to the surface layer are formed by a strong magnetic field produced by a high magnetic flux density core.

Next, when the magnetic head with the reverse azimuth shown in FIG. A so-called deep recording is realized in which a video track is recorded as a track TV[, and an audio track is formed in the deep layer and a video track is formed in the surface layer.

FIG. 3 is an explanatory diagram showing a main part of an example of the method for manufacturing a composite magnetic head of the present invention. In FIG. 3, a thin V-shaped notch 27 is provided in the ferrite core 21, and a first
A second magnetic core 22 made of sendust, permalloy, amorphous, etc. is formed on the side surface of the track Tv.
A track TA is formed by means such as sputter deposition, and an etching step ΔE is provided on the abutting surfaces 25 and 26 by means such as lap etching, chemical etching, and chemical dry etching on the mirror surface, and a thickness equal to the first cap length is formed. A non-magnetic metal oxide film 24 is applied, the two are butted together, adhesively bonded with glass 23, and cut at the positions indicated by dotted lines to form a composite magnetic head as shown in FIGS. 1A and 1B.

[Effects of the Invention] As described above, according to the composite magnetic head of the present invention, by forming two tracks having different functions in one magnetic head, deep recording can be performed with one magnetic head. , a reduction in cost and man-hours for magnetic head assembly is realized.

[Brief explanation of drawings]

1A and 1A are respectively front views of the composite magnetic head of the present invention, FIG. 2 is a tape pattern diagram showing the functions of the composite magnetic head same as above, and FIG. 3 is a manufacturing method of the composite magnetic head of the present invention. FIG. 4 and FIG. 5 are respectively diagrams showing the arrangement of the magnetic heads of a conventional deep recording type VTR, and FIG. 6 is a front view showing the main parts of an example. Diagram showing the pattern, Figure 7 is the 6th
It is a figure which cut and showed the tape of the tape pattern of a figure. DESCRIPTION OF SYMBOLS 1...High permeability magnetic core, 2...Second magnetic core, 3.23...Glass, 21...Ferrite core, 22...Magnetic core, 24...Non Magnetic metal oxide film, 25.28...butting surface, 27...notch. Applicant's representative Patent attorney Takehiko Suzue 27: Cut = Figure 3

Claims (1)

[Claims] In a magnetic head used in a helical scanning video tape recorder that records signals diagonally on a magnetic tape using two magnetic heads that rotate 180 degrees opposite each other, a high-permeability magnetic material is used to record video signals on the surface layer of the magnetic tape. a first core; and a second core, which is formed of a magnetic material such as a high magnetic flux density and high permeability material on the side surface on the advancing side of the track recorded by the first core, and records audio signals in the deep part of the magnetic tape. A composite magnetic head comprising: