JPS6313113A - Rotary magnetic head device - Google Patents

Abstract

PURPOSE:To reduce number of parts and to contrive to miniaturize the titled device by constituting stationary side core of a rotary transformer as a stationary drum and a rotor side core as a rotary drum so as to fit a magnetic head directly to the rotor side core, thereby simplifying the constitution of the rotary magnetic head device. CONSTITUTION:The rotary magnetic head device consists of a base 1, a tape guide drum 2, a rotary drum 3, and a motor unit 4. The drum 2 consists of a stationary drum 5 fitted to the base 1, a rotary shaft 7 fitted to the axial center via a bearing 6 freely turnably, and the rotary drum 3 fitted integratedly therewith. The stationary drum 5 is constituted as the stationary core of the rotary transformer and signal transmission coils 8, 9 are arranged to a face opposed to the rotary drum 3. Signal transmission coils 10, 11 for the rotor side are fitted to a face of the drum 3 opposed to the drum 5. The rotary drum 3 is constituted as the stationary side core and the magnetic head 13 is fitted to the peripheral of the lower end face.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applicable to digital audio tape recorders (DA
The present invention relates to a rotating magnetic head device used in a magnetic recording/reproducing device such as T).

<Summary of the Invention> The present invention provides a fixed core of a rotary transformer having a signal transmission coil wound around the upper surface thereof, a rotary shaft rotatably attached to the axis of the fixed core, and a rotary transformer that is integral with the rotary shaft. The rotating core of the rotary transformer has a No. 58 transmission coil wound around its lower surface so as to face the signal transmission coil of the stationary core, and the head tip slightly protrudes from the circumferential surface of the rotating core. The structure of this rotating magnetic head device is constructed by using the outer circumferential surface of a rotary transformer consisting of a magnetic head directly attached to the rotating core, the stationary core, and the rotating core as a tape guide surface. This is an attempt to reduce the size of the entire head device by simplifying it and reducing the number of parts.
A rotating magnetic head device used in a magnetic recording/reproducing device such as the above includes a fixed drum that is mounted on a base and has a fixed core of a rotary transformer installed inside the main body of the device.
It consists of a rotating shaft that is rotatably attached to the axis of this fixed drum, and a rotating drum that is integrally attached to this rotating shaft. A magnetic head is attached to the rotating drum on the side of the rotating drum that faces the fixed drum, and further faces the fixed side core of the rotary transformer via a flange section attached to the rotating drum. A rotary transformer is known in which the rotating core of the rotary transformer is attached as shown in FIG.

In such a rotating magnetic head device, the fixed drum and the rotating drum are configured as a tape guide drum,
The magnetic tape is wound around the tape guide drum and the rotating magnetic head device is mounted on the rotating drum by rotating the rotating shaft with a motor unit provided on the underside of the base. A magnetic head attached to the rotating drum is brought into sliding contact with the magnetic tape, and recorded and/or reproduced by a predetermined information signal transmitted via the rotary transformer.

By the way, in the conventional rotating magnetic head device, as described above, the fixed drum serving as the tape guide drum, the rotating drum, and the rotary transformer are constructed separately. That is, a fixed core of a separate rotary transformer is installed inside the fixed drum. Further, the rotating drum and the rotating core of the rotary transformer are also formed separately, and the rotating drum and the rotating core are attached via the flange portion. The magnetic head is attached to the rotating drum via a head support plate.

The flange portion is used to adjust the height of the magnetic head by using the upper surface of the flange portion. That is, the height position of the magnetic head is adjusted by canting the upper surface of the flange portion into a planar shape with high precision, and by maintaining parallelism when rotating the magnetic head. This is to adjust the

<Problems to be Solved by the Invention> Incidentally, in recent years, magnetic recording/reproducing devices such as the above-mentioned DAT have been proposed that are miniaturized to the point of being portable. In this type of miniaturized device, there is a need to downsize the rotating magnetic head device incorporated in the device, and in order to make it possible to make the head device smaller and thinner, it is necessary to simplify the head device and parts. A reduction in points is requested.

However, in the above-mentioned rotating magnetic head device,
The fixed drum and the fixed core of the rotary transformer are configured separately, the rotating drum and the rotating core of the rotary transformer are configured separately, and the flange is connected to the rotating drum and the rotating core. This makes it impossible to downsize the entire rotating magnetic head device, and requires a sophisticated polishing technique to maintain the flatness of the upper surface of the flange with high precision. Furthermore, the assembly of screw members and the like for attaching the flange portion to the rotating drum requires members, and the number of parts increases.

However, in DATs, especially read-only DATs, the tolerance of the angular division of the magnetic head is less regulated than in video tape recorders (VTRs). Therefore, there is no need to use the flange section to adjust the height of the magnetic head as described above, and it is sufficient to adjust the height of the magnetic head simply by managing the gap between the fixed core and the rotating core of the rotary transformer. It is possible to set it within the above tolerance.

Therefore, the present invention simplifies the configuration of this rotating magnetic head device and reduces the number of parts by configuring the rotary transformer as it is as a tape guide drum and further attaching a magnetic head directly to the rotating core of the rotary transformer. , thereby attempting to downsize the entire head device.

Means for Solving the Problems> In order to solve the above problems and achieve the above objects, the present invention provides a fixed side core of a rotary transformer having a signal transmission coil wound on the upper surface side, A rotary rotary having a rotary shaft rotatably attached to the axis of the side core, and a signal transmission coil integrally attached to the rotary shaft and having a signal transmission coil wound on the lower surface side so as to face the signal transmission coil of the fixed side core. An outer periphery of a rotary transformer consisting of a rotating core of the transformer, a magnetic head that is directly attached to the rotating core so that the tip of the head protrudes beyond the circumferential surface of the rotating core, the stationary core, and the rotating core. The surface serves as a tape guiding drum.

Effects> The present invention is such that the fixed core of the rotary transformer is configured as a fixed drum, the rotating core of the rotary transformer is configured as the rotating drum, and a magnetic helad is directly attached to the rotating core. The configuration of the device is simplified and the number of parts is reduced. The height position of the magnetic head can be set within the angular division tolerance simply by managing the gap between the stationary core and the rotating core of the rotary transformer.

<Embodiments> Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the rotary magnetic head device according to the present invention has a tape guide drum section 2 attached to the upper surface of the base 1, and a tape guide drum section 2 attached to the upper surface of the base 1, as shown in FIG. The rotating drum 3 of this tape guide drum section 2
It consists of a motor unit 4 that rotates the .

The tape guide drum 2 is mounted on a fixed drum 5 fixed to the base 1, and a bearing 6 on the axis of the fixed drum 5.
It consists of a rotating shaft 7 that is rotatably attached via a rotary shaft 7, and a rotating drum 3 that is integrally attached to this rotating shaft 7.

The fixed drum 5 is configured as a fixed core of a rotary transformer, and a signal transmission coil 8.9 for transmitting information signals is disposed on its upper surface, that is, the surface facing the rotating drum 3. .

Further, on the lower end side of the rotating drum 3, that is, on the surface facing the fixed drum 5, rotor-side signal transmission coils 10.1 are arranged so as to face the signal transmission coils, respectively.
1 is attached, and this rotating drum 3 itself is configured as a rotating core of a rotary transformer. Further, this rotary drum 3 is provided with a magnetic head mounting portion 12 on the outer peripheral portion of its lower end surface.
The head 13 is attached so that the tip of the head slightly protrudes from the circumferential surface of the rotating drum 3 (ff).

Therefore, the rotary transformer itself is connected to the tape guide drum 2.
The outer peripheral surfaces 3a and 5a of the stationary core and rotating core of the rotary transformer are configured as tape guide surfaces. Therefore, the magnetic tape 1 attached to the rotating drum 3, which is the rotating core of the rotary transformer, is attached to the magnetic tape wound around the tape guide drum 2 and traveling.
Recording or reproduction can be performed by slidingly touching 3.

In this embodiment, the magnetic head 13 is attached to the outer periphery of the lower end surface of the rotary drum 3, but the magnetic head 13 can be attached to the lower end surface without being limited in position. The magnetic head may be mounted so as to be embedded in the middle of the surface.

Next, the rotating drum 3, which is the rotating core of this rotary transformer, is assembled into the main body of the device by press-fitting the rotating shaft 7 into the hole 14 provided at the axial center of the rotating drum 3. When performing this press-fitting, the magnetic head 10 can be inserted while controlling and adjusting the gear between the fixed drum 5, which is the fixed core of the rotary transformer, and the rotating drum 3, which is the rotating core of the rotary transformer.
The height position of can be set within the tolerance of angle division (=f).

Therefore, there is no need to separately form the rotary transformer, fixed drum, and rotating drum as shown in the above-mentioned conventional example, and there is no need to provide a flange portion on the rotating drum. Therefore, the number of parts of this rotary magnetic head device is reduced and the assembly process is also simplified.

Note that since the rotating drum 3 that serves as the rotating core of the rotary transformer can be integrally processed, the rotating shaft 7 can be attached to the outer circumferential surface 3a of the drum 3 by press-fitting the rotating shaft 7 into the hole 1.
The peripheral surface 3b of No. 4 and the mounting of the magnetic head described above can also improve the machining accuracy of the portion 12.

Next, the motor unit 4, which is a rotational driving member that rotates the rotary drum 3, is configured as a direct drive type motor unit in this example.
Although a detailed explanation will be omitted, for example, as shown in FIG. 1, a stator coil 16 is disposed on the outer circumference 15 of the bearing 6, and is connected to the rotating shaft 7 facing the outer circumference of the stator coil 16. A rotor magnet 18 attached to the rotor yoke 17 is disposed. Therefore, by supplying a current to the stator coil 16, a rotational force is generated in the rotor magnet 18, and this rotational force rotates the rotating shaft 7 and rotates the rotating drum 3. There is.

Note that this motor unit 4 is not limited to a direct drive type as in this example, but may of course be a belt drive type motor or the like.

<Effects of the Invention> According to the present invention, the fixed core of the rotary transformer is configured as a fixed drum, the rotating core of the rotary transformer is configured as the rotating drum, and further, a magnetic head is directly attached to the rotating core. Therefore, the configuration of the device can be simplified and the number of parts can be reduced.

The height position of the magnetic head can be set within the angular division tolerance simply by managing the gap between the stationary core and the rotating core of the rotary transformer.

Therefore, the rotating magnetic head device can be easily assembled, and the entire device can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view showing an outline of a rotating magnetic head device of the present invention. 3... Rotating drum (rotating side core of rotary transformer) 5... Fixed drum (fixed side core of rotary transformer) 7... Rotating shaft 13... Head device Fig. 1

Claims (1)

[Claims] A fixed core of a rotary transformer having a signal transmission coil wound around the upper surface thereof, a rotating shaft rotatably attached to the axis of the fixed core, and integrally attached to the rotating shaft. The rotating core of the rotary transformer has a signal transmission coil wound around its lower surface so as to face the signal transmission coil of the stationary core, and the rotary transformer has a rotating core with a signal transmission coil wound around the lower surface thereof so as to face the signal transmission coil of the stationary core, and A rotating magnetic head device comprising: a magnetic head directly attached to a rotating core; and a rotary transformer comprising a fixed core and a rotating core; the outer peripheral surface of a rotary transformer serving as a tape guide surface.