JPS62140220A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To allow a metal tape with a high Hc to use a ferrite head and to cut down a cost by composing a recording-only head of a head with a wider gap width than that of a reproduction-only head subsequent to the former head when the recording-only head is installed on the outer periphery of a head drum. CONSTITUTION:A luminance signal recording-only head 4 and a chrominance signal recording-only head 5 are installed on the outer periphery of the head drum 1 where a magnetic tape 2 slides through a tape guide 3 in that order, viewed from the top in the rotating direction of the drum 1. By following them, a luminance signal reproduction-only head 6 and a chrominance signal reproduction-only head 7 are provided at about 15 deg. angle away from the head 4, and similar heads 4'-7' are disposed by facing the heads 4-7 at 180 deg.. In this constitution the gap widths of the heads 4, 5, 4' and 5' are set larger than those of the heads 6, 7, 6' and 7', and the metal tape with a high Hc can use a low-priced ferrite.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to magnetic recording and reproducing apparatuses such as video tape recorders that use magnetic tapes with high Hc.

Metal tape 21\ as a magnetic tape that obtains conventional technology high S/N
.

However, since the H6 of the tape is as high as 1400 oersted, Sendust heads or amorphous heads with high magnetic flux density are used as recording/reproducing heads.

By the way, since the Sendust head and the amorphous head have a low magnetic permeability μ0, the reproduction efficiency decreases.

For this reason, when commercializing ferrite, sendust or amorphous is attached to the ferrite to increase the effective magnetic permeability.

Problems to be Solved by the Invention However, in the above configuration, a pseudo gap is formed and the amorphous portion is crystallized, resulting in extremely poor fractionation of the head, resulting in extremely high costs. This is the actual situation.

This high cost is due to the high image quality and multi-function V
This becomes noticeable in TR. For example, a VTR that records and plays one luminance signal and one color signal on separate tracks on a magnetic tape requires four units, and adding a simultaneous playback function requires a total of eight units, making it quite expensive. Ta.

3 pages.

The present invention is particularly aimed at reducing the cost of high image quality and multifunctionality with a large number of heads.

Means to Solve the Problems The present invention utilizes the characteristics of ferrite heads, which have an established construction method and are extremely low in cost, to be used exclusively for recording and for reproduction only, in order to record and reproduce metal tapes with high Hc. It is composed of

That is, a ferrite head with a narrow gap width is provided as a leading head that traces the same track, and a ferrite head with a narrow cap width is provided as a trailing head.

Effect: According to the above configuration, since the leading edge has a wide gap width, magnetic saturation is reduced, and even a metal tape with high Ho can be recorded satisfactorily. The trailing head may be used only for reproduction.

Embodiment FIG. 1 shows the head arrangement of drum soil in a heel according to an embodiment of the present invention. The example shown here is a so-called component type VTR that records and plays back luminance signals and color signals on separate tracks of a magnetic tape, and has a simultaneous playback function. 1 is a head tram, 2 is a magnetic tape, and 3 is a VTR that has a simultaneous playback function. is a tape kite. Numeral 4 is a head dedicated to recording luminance signals, and numeral 6 is a head dedicated to recording color signals, in which a ferrite head with a wide cap is used. Reference numeral 6 designates a head dedicated to reproducing luminance signals, and 7 designates a head dedicated to reproducing color signals, in which a ferrite head with a narrow gap width is used. Furthermore, head 4,
5,6°7 is for even field of video signal, 18
o.

Head 4L with similar configuration in position, 51.61. yl
is provided for odd fields.

FIG. 2 is a diagram showing the arrangement of the luminance signal head 4 and the color signal head 6 in the direction of one rotation in the axial direction of the head drum.
′ is the same as the relationship. In this example, the head drum diameter is 76 mm, the tape speed is 67 MM/S, and a=0.
．． 039ffJ b=4.6025/・-7 It's me.

The heads 4 and 6, and 5 and 7 are set at an angle of .theta.-15 DEG to prevent crosstalk between the heads during simultaneous reproduction.

Figure 3 is a track pattern diagram, in which the head 6° is axially aligned with respect to 4.5 so that the head 6°7 traces the recording track 10.11 recorded by the heads 4 and 5 and obtains a reproduced signal. It is attached to the bottom of the tower.

Here, the gap width of heads 4, 5, 4', 5' is as wide as 0.35μ, and the gap width of heads 6, 7.6', 7' is as wide as 0.35μ.
The gap width used is as narrow as 0.26μ.

Effects of the Invention The present invention is configured so that the ferrite head with a wide gap width is used only for recording and the ferrite head with a narrow gap width is used only for reproduction, so that the ferrite head can be used even for metal tapes with high Ho. This has the excellent effect of reducing the cost by 6 bays and realizing a significant cost reduction.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the head arrangement of an embodiment of the present invention;
FIG. 2 is a front view showing an example of the arrangement of the luminance signal head and the color signal head, and FIG. 3 is a track pattern diagram showing the trajectories of the recording-only head and the reproduction-only head. 4, 5.4', 5' --- Ferrite head for recording only, 6.7.61.71... Ferrite head for reproduction only.

Claims (1)

[Claims] First and second ferrite heads having head gaps G_1 and G_2 (G_1<G_2) are disposed on the head drum, and the first ferrite head and the second ferrite head are arranged on a magnetic tape. As if tracing the same trajectory traced above, it should follow the angle θ° and be installed with a step in the direction of the rotation axis of the head drum by θ°/180° x (video track pitch). Features of magnetic recording and reproducing device.