JPH01166315A - Revolving head device - Google Patents

Abstract

PURPOSE:To simplify the fitting and adjusting work of a magnetic head by fixing a rotor transformer to a sleeve and fitting a head base to this rotor transformer. CONSTITUTION:A rotor transformer 16 is fixed to a sleeve 12, which is fixed to a revolving shaft 11, and a head base 13 is fit to this rotor transformer 16. Accordingly, the inner space of a revolving drum 21 can be effectively used. Namely, since the rotor transformer 16, which is main parts in the revolving drum 21, and the head base 13 are mutually fixed with being adhered, the unnecessary space is eliminated in the shaft direction of the drum and the drum can be made in a thin shape. In a stage that the head base 13 is fit to the rotor transformer 16, the position adjustment of the head can be completed. Thus, the position adjustment of the magnetic head in the middle of assembly is eliminated and later, it is enough to adjust the height of the magnetic head in the drum shaft direction from an external part by a screw, etc.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a rotary head device installed in a small VTR or DAT, and particularly to a rotary head device that can be made small in diameter and thin, and can be mounted with a magnetic head accurately positioned. This invention relates to a rotary head device.

[Background of the invention]

FIG. 6 is a sectional view schematically showing the structure of a conventional rotary head device.

In a conventional rotating head device, a rotating drum 5 is generally fixed to the upper end of a rotating shaft 4 either directly or via a sleeve, and a head base 7 is fixed to the lower end of the rotating drum 5. Head chip H is fixed. A fixed drum 1 holds a bearing 2,
The rotating shaft 4, which is integrated with the rotating drum 5 as described above, is rotatably supported by the bearing 2. Further, reference numeral 3 is a stator transformer, and reference numeral 6 is a rotor transformer. Head signals are transmitted through both transformers 3 and 6 in a non-contact manner and guided to an external control circuit.

(Problems to be Solved by the Invention) Some small VTRs, DATs, etc. are required to be equipped with a small rotating head device with a diameter of about 15 mm.However, the conventional device shown in FIG. When trying to form a rotating head device with a small diameter structure, the rotating drum 5
It is no longer possible to secure a large space for fixing the head base 7 on the lower surface of the head base 7, and the installation of the head base 7 becomes extremely difficult. Further, if the drum has a small diameter, it becomes extremely difficult to adjust the position and height of the plurality of Herad chips. For this reason, when a rotary head device with a conventional structure is made smaller in diameter, the axial height dimension becomes larger in order to secure space for installing the head and space for adjusting the head position, resulting in an unbalanced device. takes shape.

The present invention solves the above-mentioned conventional problems, and aims to provide a rotating head device in which the drum can be made small in diameter and thin, and the magnetic head can be easily attached and adjusted. The purpose is

[Specific Means for Solving the Problems] In the rotary head device according to the present invention, a sleeve is fixed to the upper end of the rotating shaft, a rotor transformer and a rotating drum are fixed to this sleeve, and the fixed drum has the above-mentioned A bearing for rotatably supporting a rotating shaft and a stator transformer facing the rotor transformer are provided, a head base is supported on the upper surface of the rotor transformer, and a head chip is fixed to the tip of the head base. It is something.

[For production]

In this rotary head device, the rotor transformer is fixed to the sleeve fixed to the rotary shaft, and the head base is attached to the rotor transformer, so that the space inside the rotary drum can be used effectively. That is, since the rotor transformer and the helad base, which are the main components in the rotating drum, are fixed in close contact with each other, there is no wasted space in the axial direction of the drum, and the drum can be made thinner. In addition, since the head position adjustment can be completed when the Herad base is attached to the rotor transformer, there is no need to adjust the position of the magnetic head during assembly, and all that is left to do is to adjust the height of the magnetic head in the direction of the drum axis. This means that it is only necessary to adjust it externally using screws or the like.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 is a sectional view of a rotating head device according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is an exploded perspective view of the rotating head device.
FIG. 4 is a perspective view of the rotary drum viewed diagonally from below, and FIG. 5 is an exploded perspective view showing the attachment of the sleeve and rotor transformer.

The rotating head device shown in this example is for DAT,
It is a small tape with a diameter of about 15 mm, and the tape is about 1
It targets items that can be wrapped at an 80 degree angle.

Reference numeral 11 is a rotation axis. A sleeve 12 is fastened to the upper end of the rotating shaft 11 by a ring 18 (see FIG. 1). As shown in FIG. 5, the sleeve 12 is integrally formed with a flange 12a and a fitting boss 12b projecting below the flange 12a. code 1
6 is a rotor transformer. A hole 16a is formed in the center of the rotor transformer 16, and the fitting boss 12b at the lower end of the sleeve 12 is fitted into the hole 16a, and the sleeve 12 and the rotor transformer 16 are fixed with adhesive or the like. The upper surface of the rotor transformer 16 is an insulating layer 15
It has become. This insulating layer 15 is a rotor transformer 16
It is formed by gluing a thin printed circuit board or coating the surface with an insulating material.

In the illustrated embodiment, a conductor pattern 15a is formed on the surface of the insulating layer 15 to establish electrical continuity between the head and the rotor transformer. Further, the rotor transformer 16 is formed with a female screw hole 16b for mounting the head base and a recess 16c for escaping the helad tip.

The head chip H is fixed to the lower surface of the tip of the head base 13, and this head base 13 is connected to the rotor transformer 1.
It is fixed on the upper surface of the insulating layer 15 of No. 6. Since the core of the rotor transformer 16 is made of a soft material such as ferrite, plastic screws or the like are used to attach the head base 13.
3 is inserted into the hole 13a and screwed into the female screw hole 16b of the rotor transformer 16. and rotor transformer 1
The lead wire 17a of No. 6 and the lead portion (not shown) of the head chip H are electrically connected to each other via the conductor pattern 15a on the surface of the insulating layer 15. Further, the head chip H fixed to the bottom surface of the tip of the helad base 13 comes to be located within the escape recess 16c formed in the rotor transformer 16.

Reference numeral 21 is a rotating drum. The rotating drum 21 is mounted on an assembly 10 consisting of the rotating shaft 11, sleeve 12, head base 13, head chip H, rotor transformer 16, and the like. The rotating drum 21 is positioned and installed so that its bottom surface touches the flange 12a of the sleeve 12, and the rotating drum 21 and the sleeve 12 are fixed with screws or the like. As shown in FIG. 4, an escape groove 21b is formed on the lower surface of the rotating drum 21, and the head base 13 is accommodated within this escape groove 21b. The rotating drum 21 has a female screw hole 2.
1c is formed, and an adjustment screw 22 is screwed into this female threaded hole 21c (see FIG. 1). After the assembly of the rotary head device is completed, the head base 13 is pressed by the adjustment screw 22 to adjust the height of the head chip H in the direction of the drum axis.

Reference numeral 31 is a fixed drum. A radial bearing 32 is held at the center of the fixed drum 31, and the rotating shaft 11 is inserted into the radial bearing 32 and supported rotatably. A stator transformer 33 is fixed within the fixed drum 31. This stator transformer 33 is opposed to the rotor transformer 16 with a small gap therebetween. Lead wires of the stator transformer 33 are extended to the outside by a flexible substrate 34.

Also, the thrust bearing 41 receiving the lower end surface of the rotation @11
is fixed to the base 42. This base 42 is integrated with the fixed drum 31. By this thrust bearing 41, the rotating shaft 11 and the rotating drum 31
The vertical position of the head chip H is determined, and thus the height position of the head chip H is also determined.

Further, although not shown, a motor is installed at the bottom of the fixed drum 31, and the rotating shaft 11 is rotationally driven by this motor.

Next, the assembly process of the above rotary head device will be explained.

First, as shown in FIG. 5, the fitting boss 12b at the lower end of the sleeve 12 is fitted into the hole 16a of the rotor transformer 16 and fixed to each other. Around this time, the head base 13 is fixed to the upper surface of the insulating layer 15 of the rotor transformer 16 with a plastic screw or the like. A plurality of helad bases 13 are attached with a common surface of the rotor transformer 16 as a reference. Therefore, once the head base 13 is attached to the upper surface of the rotor transformer 16, it is possible to adjust the attachment position of the head base 13 and complete the adjustment work for attaching the head chip H. Further, after the helad base 13 is attached, the lead wire 17a of the rotor transformer 16 and the lead portion of the head chip H are electrically connected through the conductor pattern 15a.

Thereafter, the rotating shaft 11 is inserted into the sleeve 12, and the ring 18 is tightened from the outside of the sleeve 12, thereby completing the assembly shown by the reference numeral 10 in FIG.

A rotating t-ram 21 and a stationary drum 31 are attached above and below this assembly 10. The rotating drum 21 is positioned by bringing its bottom surface into contact with the upper surface of the flange 12a of the sleeve 12, and the sleeve 12 and the rotating drum 21 are fixed with screws or the like. To this time Radbase 13
is an escape groove 2i formed on the lower surface of the rotating drum 21.
In addition, the herad tip H is located without hitting the escape recess 16c of the rotor transformer 16.

Furthermore, for the fixed drum 31, the rotating shaft 11 is connected to the bearing 32.
It is inserted inside and installed. The installation height of the rotating shaft 11 is determined by the thrust bearing 41 shown in FIG.

Further, after the above assembly is completed, the adjustment screw 22 screwed onto the rotating drum 21 is rotated to adjust the amount of deflection of the head base 13, thereby adjusting the height of the head chip H.

(Effects of the Invention) As described above, according to the present invention, since the rotor transformer is fixed to the sleeve and the head base is attached to the rotor transformer, the space inside the rotating drum can be used effectively. The drum can be made smaller in diameter and thinner. Furthermore, since the distance between the herad base and the rotor transformer is shortened, the wiring between the two can be shortened and easily made. Furthermore, once the Herad base is attached to the rotor transformer, the head position adjustment can be completed and the wiring route between the head chip and the rotor transformer can be checked, making assembly and adjustment work easier. .

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention, FIG. 1 is a cross-sectional view of a rotary head device according to the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is an exploded view of the rotary head device. FIG. 4 is a perspective view of the rotary drum viewed diagonally from below, FIG. 5 is a perspective view showing the process of attaching the sleeve and rotor transformer, and FIG. 6 is a sectional view of a conventional rotary head device. 11...Rotating shaft, 12...Sleeve, 12a...
Flange, 13... Head base, 15... Insulating layer of rotor transformer, 16... Rotor transformer, 21...
... Rotating drum, 31... Fixed drum, 32... Radial bearing, 33... Stator transformer. Applicant: Alps Electric Co., Ltd. Agent: Patent Attorney: Teruo Nozaki"
13 To, dohei Mata 16 ・ Low 9 Torashifu, 31 Fixed consideration 32 j Yuu 33, Mata Chi 91 Rashimata H, Tou Dou
Ia 2nd Flash Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] A sleeve is fixed to the upper end of the rotating shaft, a rotor transformer and a rotating drum are fixed to the sleeve, and the fixed drum is provided with a bearing that rotatably supports the rotating shaft and a stator transformer that faces the rotor transformer. A rotary head device comprising: a head base supported on the upper surface of the rotor transformer; and a head chip fixed to the tip of the head base.