JPH11339234A - Rotating drum type magnetic head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating drum type magnetic head which is made so as to be completed by manufacturing only one kind of head chip to be incorporated in a magnetic head assembly. SOLUTION: This magnetic head is a rotating drum type magnetic head which is provided with a rotating drum 40 which rotates by being facing opposite to a fixed drum and at least one pair of magnetic head assemblies 30 which are to be fixed on a counter surface with the fixed drum of the rotating drum and a slope 43 for setting azimuth angles are formed at fixing positions of the magnetic head assemblies of the rotating drum 40 in this magnetic head.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating drum type magnetic head used for video or audio, and more particularly to a rotating drum type magnetic head having a rotating drum having a structure for setting an azimuth angle.

[0002]

2. Description of the Related Art In general, a rotating drum type magnetic head used in a video deck is fixed to a fixed drum, a rotating drum rotating opposite to the fixed drum, and a surface of the rotating drum facing the fixed drum. At least one pair of magnetic head assemblies, a DC motor for rotating the rotary drum, and a rotary transformer used for signal transmission between the rotary drum and the fixed drum are configured as main components.

[0003] The magnetic head assembly includes a head base to be attached to the rotating drum, and a head chip fixed to the head base. The head chip is entirely formed of a magnetic material, and a part thereof is wound. As shown in FIG. 3A or 3B, the head chip 10
A gap 12 is formed on the magnetic tape sliding surface 11. Reference numeral 13 denotes glass embedded in the sliding contact surface 11 for defining the effective width of the gap 12. The gap 12 is set at an angle θ with respect to a line 14 perpendicular to the plane of the head chip 10 so as to define the azimuth angle θ.

FIG. 3A shows a head chip 10R for an R channel (also called an A channel or one channel) in which the azimuth angle θ of the gap 12 is inclined clockwise. FIG. 3B shows the gap 12
Shows the head chip 10L for the L channel (also called the B channel or the two channels) in which the azimuth angle θ is inclined in the counterclockwise rotation direction. Taking VHS as an example, θ = 6 ° for a video head and θ = 30 ° for an audio head.

Conventionally, as shown in a front view of FIG. 4A, a head chip 10 having such a structure is fixed to the lower surface of a head base 20, and a coil lead wound around the head chip 10 is used as a head. The magnetic head assembly 30 is formed by, for example, soldering to a printed board on the base 20. Then, as shown in the partial front view of FIG. 4B, the magnetic head assembly 30 is screwed and fixed to a flat surface 41 of the rotating drum 40 (the surface facing the fixed drum not shown). I have. Reference numeral 42 denotes a concave portion formed on the facing surface 41 of the rotating drum 40, in which the head chip 10 is accommodated in a non-contact manner.

[0006]

In the conventional rotary drum type magnetic head, even in the case of the two-head type, a pair of magnetic head assemblies for the R channel and the L channel incorporating the pair of head chips 10R and 10L respectively are used. It is separated on the center line and mounted on the rotating drum 40.
Therefore, it is necessary to manufacture two types of head chips 10R for the R channel and 10L for the L channel, and there is a disadvantage that the number of manufacturing steps for this purpose increases. This is a problem to be solved by the present invention.

According to the present invention, a azimuth angle setting structure is formed on a rotating drum side on which a magnetic head assembly is mounted, so that only one type of head chip to be incorporated into the magnetic head assembly needs to be manufactured. It is intended to provide a drum-type magnetic head.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotary drum which rotates in opposition to a fixed drum, and at least a pair of magnetic head assemblies which are fixed to a surface of the rotary drum facing the fixed drum. And an inclined surface for setting an azimuth angle formed at the fixed position of the magnetic head assembly of the rotating drum. According to an embodiment of the present invention, the inclined surface is
The magnetic head assembly is inclined in a direction corresponding to the type of the channel.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments shown in the drawings. FIG. 1 is a partial front view showing one embodiment of a rotary drum type magnetic head according to the present invention. In this figure, 10 is a head chip, 20 is a head base, 30 is a magnetic head assembly incorporating the head chip 10 in the head base 20, 40 is a rotating drum to which the magnetic head assembly 30 is fixed, and 50 is a magnetic head assembly A screw for attaching the three-dimensional body 30 to the rotating drum 40.

In the head chip 10 according to the present invention, the azimuth angle is not set by the chip itself. In other words, the gap 12 in FIG. 3 coincides with the line 14 (θ =
0 °). Instead, in the present invention, an inclined surface 43 for setting an azimuth angle is formed on the fixed portion of the rotating drum 40 on the magnetic head assembly. Even in this case, the inclined surface 43 is provided between the gap of the head chip 10 and the magnetic tape.
Azimuth angle is set according to the inclination angle θ.

FIG. 2 is a structural view showing the whole of the magnetic head of FIG. 1, wherein (A) is a rear view, (B) is a plan view, and (C) is a front view. A circular hole 44 for inserting a rotating shaft of a DC motor is formed in the center of the rotating drum 40. At both ends of a center line 45 passing through the circular hole 44, an inclined surface 43R for the R channel and an inclined surface 43 for the L channel
L are formed. These inclined surfaces 43R and 43
L is inclined from the flat opposing surface 41 by an angle θ in directions of rotation opposite to each other. Magnetic head assembly 30R for R channel and magnetic head assembly 30 for L channel
L is fixed to the inclined surfaces 43R and 43L by screws 50, respectively.

If such inclined surfaces 43R and 43L are formed on the facing surface 41 of the rotary drum 40, the head chip 10 does not need to be azimuth-adjusted for the R and L channels, so only one type is required. . Further, the same head chip 10 can be applied to inclined surfaces having different inclination angles θ.
For this reason, a head chip that can handle all azimuth angles can be manufactured with only one type of manufacturing process, so that the manufacturing process is simplified as compared with the conventional method.

[0013]

As described above, according to the present invention, since the azimuth angle setting structure (inclined surface) is formed on the rotating drum side on which the magnetic head assembly is mounted, the head chip incorporated in the magnetic head assembly is provided. Can be realized by manufacturing only one type of magnetic head.

[Brief description of the drawings]

FIG. 1 is a partial front view showing one embodiment of a rotary drum type magnetic head according to the present invention.

FIG. 2 is a configuration diagram showing the entire magnetic head of FIG. 1;
(A) is a rear view, (B) is a plan view, and (C) is a front view.

FIG. 3 is a partial front view showing azimuth angles of different channels in a conventional head chip.

FIG. 4 is a configuration diagram showing a conventional rotary drum type magnetic head.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Head chip 11 Sliding surface 12 Gap 20 Head base 30 Magnetic head assembly 40 Rotating drum 41 Opposing surface 42 Depression 43 Inclined surface 50 Mounting screw

Claims (2)

[Claims] A rotating drum that rotates to face the fixed drum; a pair of magnetic head assemblies fixed to a surface of the rotating drum facing the fixed drum; and a magnetic head assembly of the rotating drum. And an inclined surface for setting an azimuth angle formed at a fixed position of the rotary drum. 2. The magnetic head according to claim 1, wherein the inclined surface is inclined in a direction corresponding to a type of a channel of the magnetic head assembly.