WO2001071710A1

WO2001071710A1 - Rotary head device

Info

Publication number: WO2001071710A1
Application number: PCT/JP2001/002082
Authority: WO
Inventors: Masakazu Ito; Hisashi Takahashi; Katsuo Ishikawa
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2000-03-21
Filing date: 2001-03-15
Publication date: 2001-09-27
Also published as: JP2001266302A

Abstract

A rotary head device which is easy to produce and very high in reliability with respect to environmental changes in temperature, humidity, etc., and which is of high performance with satisfactory rotation balance and allows easy mounting and removal of the rotary transformer, wherein reception and transmission of signals by a magnetic head (21) attached to a rotary drum (2) supported for rotation with respect to a fixed drum (1) are effected through the winding (17) on the rotation side of the rotary transformer which is in the form of a flat plate attached to the attaching surface (2a) of the rotary drum (2) and the winding (18) on the fixed side of the rotary transformer which is in the form of a flat plate attached to the side of the fixed drum (1), the winding (17) on the rotary side of the rotary transformer being urged for attachment to the attaching surface (2a) of the rotary drum (2) through an elastic member (16).

Description

Description Rotating head device Technical field

The present invention relates to a rotary head device of a helical scan type magnetic recording / reproducing device, and more particularly, to a rotary head device having a flat type rotatable transformer disposed in a drum. Background art

Conventionally, as a rotary head device of a helical scan type magnetic recording / reproducing device, a flat rotary transformer is arranged in a drum as described in Japanese Patent Application Laid-Open No. 5-324504. Rotating head devices have been proposed.

Examples of such a rotary head device include, for example, a flat plate type mounted on a mounting surface of the rotary drum for transmitting and receiving signals of a magnetic head mounted on a rotary drum rotatably supported with respect to a fixed drum. A rotary head device implemented through a rotary winding of a rotary transformer and a fixed winding of a flat-plate rotary transformer attached to the fixed drum side.

The mounting of the rotary winding of the flat-type rotary transformer on the rotary drum and the mounting of the fixed-side winding of the flat rotary transformer on the fixed drum are performed using, for example, an adhesive and screws as follows. It is being done.

First, the transformer winding on the transformer side is glued to the fixing member with an adhesive Then, the fixing member is fixed to the mounting surface of the rotating drum with a screw. Next, the fixed winding of the rotary transformer is fixed to the fixing member with an adhesive, and the rotating winding of the rotary transformer and the winding of the fixed transformer are arranged to face each other, and the gap is predetermined. Fix the fixing member to which the transformer fixed side winding is adhered to the fixed drum with screws so that there is a gap between them.

In the rotating head device configured as described above, the rotary winding on the rotary transformer and the fixed winding on the rotary transformer are attached so that the gap between their facing surfaces is 20 to 50 m. However, it is necessary to maintain high accuracy of the run-out of the surface facing the drum shaft.

More specifically, the degree of parallelism between the facing surface of the rotary winding on the rotary transformer facing the rotary transformer fixing winding and the bonding surface of the fixing member and the bonding of the rotary winding on the rotary transformer to the fixing member are described. The parallelism between the surface and the joining surface of the rotating drum is maintained at about 10 / m or less, and the runout accuracy of the joining surface between the rotating drum and the fixed member with respect to the drum shaft is highly accurate to about 10〃m or less. Need to keep.

In order to obtain such high precision of the run-out accuracy, it is necessary to finish each part with high precision and perform positioning, and it is necessary to fix it with screws with high precision, so the number of parts increases. The workability is poor and the price rises.

In addition, since the flat plate type transformer and the fixing member are fixed with an adhesive, the thickness of the adhesive layer is uniform until the difference between the maximum thickness and the minimum thickness is about 10 Aim or less. Need to be managed.

However, it is difficult to apply such a high-precision adhesive, and the management of the bonding operation is complicated and the number of man-hours increases. In addition, a flat type rotary tiger Since the adhesive layer existing between the stator and the fixing member expands and contracts due to changes in temperature and humidity, the accuracy of the plane runout of the flat type rotary transformer with respect to the rotating shaft deteriorates. Furthermore, when the adhesive strength of the adhesive is reduced due to the effects of temperature and humidity, there is a serious drawback in that the adhesive is exfoliated at worst.

In order to solve such a problem, a method of directly fixing a plate type rotary transformer to a rotary drum and a fixed drum is disclosed in Examples of Japanese Patent Application Laid-Open No. 5-324504. ing.

However, although problems such as lower workability and higher price due to higher precision of parts and higher precision when fixing with screws can be solved, the thickness control of the adhesive and the temperature of the adhesive also remain. However, there still remains a problem of deterioration of the runout accuracy due to a change in humidity. In addition, because no screws are used, it is difficult to replace the lip transformer for maintenance, and it is difficult to disassemble and repair it.

The present invention solves the above-mentioned problems, the work process is easy, the reliability against environmental changes such as temperature and humidity is extremely high, a good rotation balance and high performance, and the rotary transformer can be easily attached and detached. It is an object of the present invention to provide a rotary head device that can perform the rotation. Disclosure of the invention

The rotary head device according to the present invention is characterized in that a flat rotary transformer is attached to a drum via an elastic body.

According to the present invention, it is possible to easily mount and remove the flat type rotary transformer with extremely high reliability and high performance against environmental changes such as temperature and humidity without increasing parts and man-hours. Rotating head Can be realized.

A rotary head device according to a first aspect of the present invention is a flat-plate-shaped rotary head device for transmitting and receiving signals to and from a magnetic head mounted on a rotary drum rotatably supported on a fixed drum. In a rotary head device which is implemented through a rotary transformer fixed side winding attached to the fixed drum side in the form of a transformer rotating side winding and a flat plate attached to the surface, Evening The transformer rotation side winding is biased and mounted on the mounting surface of the rotary drum via an elastic member.

According to this configuration, since the elastic member is urged and attached to the mounting surface of the rotating drum, it is extremely reliable against environmental changes such as temperature and humidity as compared with the one fixed with an adhesive. The rotation of the winding on the rotation side of the evening lance can be mounted with high accuracy, and a high-performance rotary head device having a good rotation balance can be realized.

The elastic member of the rotary head device has one or more arm portions that are flat and project outward from the engaging portion that abuts on the first-turn revolving-side winding. In addition, it has a wiring pattern as an electrical conduction means for electrically connecting the rotary transformer rotating side winding and the magnetic head.

According to this configuration, the electrical connection between the rotary transformer on the rotary unit and the magnetic head can be easily performed.

The elastic member of the rotary head device has a plurality of arm portions which are plate-shaped and project outward from an engaging portion which abuts on the rotary winding on the rotary side, and the plurality of arms are provided. Installation of the rotating drum in the section The attachment point to the cutting surface is provided at a position sandwiching the rotation center of the rotary drum.

According to this configuration, a better rotation balance can be secured. Further, in this rotary head device, a screw is used as a means for attaching the elastic member to an attachment surface on the rotating drum side.

According to this configuration, it is easy to attach and detach the winding on the rotating side of the transformer.

According to a second aspect of the present invention, there is provided a rotary head device for transmitting and receiving a signal of a magnetic head mounted on a rotary drum rotatably supported to a fixed drum by attaching the rotary drum in a flat plate shape. In a rotary head device implemented through a rotary transformer fixed-side winding attached to the fixed drum side in a flat shape and a rotary transformer winding attached to a surface, a rotary transformer fixed side is provided. It is characterized in that the winding is urged and mounted on the mounting surface on the fixed drum side via an elastic member.

With this configuration, the same effect as described above can be obtained.

As described above, according to the rotary head device of the present invention, the magnetic head mounted on the rotary drum rotatably supported with respect to the fixed drum transmits and receives signals to and from the magnetic drum. In a rotary head device implemented through a transformer rotating side winding attached to a surface and a flat transformer fixed side winding attached to a side of the stationary drum in the form of a flat plate, the rotary The transformer rotating side winding is biased and mounted on the mounting surface of the rotary drum via an elastic member, so that the electrical connection between the rotary transformer rotating side winding and the magnetic head can be achieved with a simple configuration. The connection can be realized, and the rotation of the rotary transformer winding can be easily and accurately attached and detached, and the elastic member is biased and mounted on the mounting surface of the rotating drum. It is possible to realize a high-performance rotary head device that is extremely reliable against environmental changes such as humidity and humidity, and has a good rotational balance. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a cross-sectional view of a rotary head device according to an embodiment of the present invention, FIG. 2 is a configuration diagram of a rotary transformer and an elastic member according to the embodiment,

FIG. 3 is a diagram for explaining a process of connecting a rotary transformer winding and a rotary drum according to the embodiment. Embodiment

Hereinafter, a rotary head device according to the present invention will be described with reference to FIGS. 1 to 3 based on specific embodiments.

As shown in Fig. 1, the rotating head device transmits and receives signals to and from the magnetic head 21 mounted on the rotating drum 2 rotatably supported on the fixed drum 1. (2) A flat plate-shaped opening attached to a a Transformer rotating side winding 17 and a plate-shaped opening attached to the fixed drum 1 A transformer fixed side winding 18 It is configured to be.

In detail, the drum shaft 3 implanted on the fixed drum 1 has a lower bearing

A flange 6 is rotatably supported via 4 and an upper bearing 5, and a stator 9 is fixed to the fixed drum 1 via a pedestal 8. The rotating drum 2 is arranged on the upper surface side of the flange 6, and the rotor composed of the magnet 10 and the yoke 11 is arranged on the lower surface side. The rotating drum 2 and the rotor are coaxial with the drum shaft 3 by tightening the female screw provided on the yoke 11 through the screw 13 through the through hole 14 formed in the flange 6. It is fixed to the flange 6.

The sub-yoke 7 is held via the stator 9 by the magnetic attraction of the magnet 10 with respect to the rotor. A magnetic head 21 is fixed to the lower surface of the rotary drum 2.

The rotary transformer winding 17 is urged on the mounting surface 2a formed on the upper surface side of the rotary drum 2 via the elastic member 16 which is a configuration unique to this embodiment. Installed.

FIG. 2 shows the configuration of the elastic member 16 and the one-way transformer rotating side winding 17. Here, the connection between the elastic member 16 and the transformer rotating side winding 17 in the two-channel system will be described as an example.

As shown in FIG. 2 (a), the elastic member 16 is formed of an annular plate-like member, and a fitting hole 16i is formed in the center of the elastic member 16. The fitting hole 16 i is formed so that its center is coaxial with the drum shaft 3 when incorporated in the rotary head device, and coincides with the rotation center of the rotary drum 2.

The elastic member 16 has a plurality of plate members, two arm portions 16 a, 16 a, which project outwardly from the engagement portion abutting on the rotary winding 17 of the transformer. The pair of arm portions 16a and 16b are provided with the rotation center of the rotary drum 2, that is, the center of the fitting hole 16i, as a mounting position with respect to the mounting surface 2a of the rotary drum 2. It is formed at the sandwiching position. Arms 16a and 16b respectively Screw holes 16c and 16d are drilled.On both sides of the arm 16a, when the arm 16a is attached to the mounting surface 2a of the rotating drum 2, deformation of the arm 16a The slits 16e to 16h are formed so as not to affect the site.

As described above, by providing the mounting positions of the arm portions 16a and 16b at the positions sandwiching the rotation center of the rotary drum 2 with respect to the mounting surface 2a of the rotary drum 2, good rotation balance can be secured.

Between the pair of arm portions 16a and 16b, wiring patterns 22 and 23 are formed as electrical conduction means for electrically connecting the rotary transformer winding 17 and the magnetic head 21. ing. The wiring patterns 22 and 23 are formed on the upper surface of the elastic member 16. One end of each of the wiring patterns 22 and 23 is a coil connection portion for connecting the coil wire of the rotary transformer winding 17. 2 2 a, 2 3 a force ^s, the contact unit 2 2 which connects the rotary transformer side connection piece 1 5 b to the other end b, 2 3 b, respectively.

By providing the wiring patterns 22 and 23 as electric conduction means on the elastic member 16 in this manner, the electrical connection between the rotary transformer winding 17 and the magnetic head 21 can be easily performed.

The contact portions 22b and 23b have a size of several mm in diameter around the target point where the transformer-side connection piece 15b contacts, so that the contact transformer The positional variation between the side connection pieces 15b and the contact parts 22b, 23b can be absorbed.

In addition, it is preferable that the surfaces of the contact portions 22 b and 23 b are subjected to a scab protection process such as gold plating since a stable electrical connection can be obtained over a long period of time, so that the reliability of the device is maintained. . Also, in order to provide the wiring patterns 22 and 23 on the elastic member 16, the elastic member 16 is made of synthetic resin or sheet metal, and the circuit board on which the wiring patterns 22 and 23 are provided is adhered. The elastic member 16 itself may be constituted by a circuit board.

Furthermore, in addition to the pair of arm sections 16a and 16b, screw mosquitoes 16c and 16d, slits 16e to 16h, wiring patterns 22 and 23, connection section 2 2a, 23a, and contact points 22b, 23b are provided at positions sandwiching the center of the fitting hole 16i, that is, they are arranged at 180 degrees to rotate. The rotation balance of the head device can be further improved.

As shown in FIG. 2 (b), the transformer rotating side winding 17 has a fitting portion 17 a that engages with the fitting hole 16 i of the elastic member 16, and an elastic member 16. And an elastic member receiving surface 17b on which the second member is placed.

Then, as shown in FIG. 2 (c), the fitting is performed by engaging the fitting hole 16 i of the elastic member 16 with the fitting portion 1 Ί a of the rotary transformer rotating side winding 17, An adhesive means such as an adhesive or an adhesive table is provided on the elastic member receiving surface 17b, and the fixing member 16 is fixed to the rotating winding 17 of the transformer.

As shown in FIG. 3 (a), the fixing member 16 in this state is the one-piece transformer rotating side winding 17 and the lower surface of the rotary transformer rotating side winding 17 is the receiving surface 2 of the rotating drum 2. It is arranged to abut a. At this time, a gap d exists between the back surface of the arm portion 16a of the elastic member 16 and the elastic member receiving surface 2b.

An elastic member fixing screw 24 is inserted into the screw hole 16c of the arm 16a. When the elastic member fixing screw 24 is inserted into the female screw 2 c provided on the rotating drum 2 and the elastic member fixing screw 24 is tightened, the arm 16 a is elastically deformed as shown in FIG. The rotation side winding 17 is bent in the direction of pressing against the mounting surface 2a, and the arm 16a is bent to the elastic member receiving surface 2b with the arm 16a bent by the elastic member fixing screw 24. Joined.

In this manner, the rotary transformer winding 17 is biased and mounted on the mounting surface 2a of the rotary drum 2 via the elastic member 16 so that the rotary force is generated by the reaction force of the elastic member 16. The transformer rotating side winding 17 is always stably pressed directly onto the mounting surface 2a of the rotating drum 2 without any intervening objects, and the rotary transformer rotating side winding 17 Can be installed on the rotating drum 2 with a high level of runout accuracy.

In addition, since no fixing means such as an adhesive is used between the rotary winding 1 側 and the mounting surface 2a, it is always stable without being affected by environmental changes such as temperature and humidity. High precision runout performance can be maintained. In addition, the gap between the first winding transformer rotating side winding 17 and the elastic member 16 is fixed with an adhesive or the like. Since it is fixed so as to be sandwiched between the rotating drums 2, even if the adhesive fixing the elastic member 16 and the rotary transformer rotating side winding 17 is peeled off, the single-turn rotary side winding is removed. Line 17 does not float or fall off.

In addition, since the rotary transformer winding 17 is fixed with the elastic member fixing screw 24, it is easy to attach and detach the rotary transformer winding 17 so that maintenance and inspection are extremely easy. I can do it.

Rotary drive attached to rotating head 2 as described above Above the rotating side winding 17, a rotary transformer fixed side winding 18 fixed to the support boss 19 with a small gap is fixed to the drum shaft 3 by a transformer fixing screw 20. ing.

Between the rotating drum 2 and the yoke 11, an electric conductor 15 for electrically connecting the magnetic head 21 to the rotary winding 1 on the rotary side is provided. Inserted and supported in 2a. One end of the electric conductor 15 is a magnetic head-side connection piece 15 a that connects to the magnetic head 21, and the other end is connected to the transformer rotation side winding 17. A single transformer-side connection piece 15b is formed. In FIG. 1, the two connection pieces are shown separated for convenience, but they are actually continuous and integrated.

By contacting the magnetic head-side connecting piece 15a with the connecting part of the magnetic head 21 in this manner, the electric transformer 15 is connected to the rotary transformer-side connecting piece 15b and the elastic member 16 by the magnetic head 21. The magnetic head 21 can be electrically connected to the single-turn transformer rotating side winding 1 Ί by making contact with the contact portions 2 2 b, 23 b of the arranged wiring patterns 22, 23.

In the above description, the case of the two-channel system has been described as an example as shown in FIG. 2, but the present invention is not limited to this, and can be applied to the four-channel system. In this case, arm sections 16a and 16b, screw holes 16c and 16d, slits 16e to 16h, wiring patterns 22 and 23, and connection sections 22 a, 23a, and the contact portions 22b, 23b may be arranged at 9 ° across the fitting hole 16i, and even more channels may be equally arranged. I just need.

In the above description, the fixing means for fixing the elastic member 16 and the rotary drum 2 is the elastic member fixing screw 24. If there is a concern that the member fixing screws 24 may be loosened, high precision run-out accuracy can be achieved and maintained even if they are fixed by other means such as rivets and press-fit pins.

Further, in the above-described embodiment, the rotary winding 17 of the single-piece transformer is biased and mounted on the mounting surface 2 a of the rotary drum 2 via the elastic member 16. In the case where the fixed winding 18 of the transformer is attached to the fixed drum 1 as in the embodiment described in Japanese Patent Publication No. 29455231, the elastic member is similar to the above. A similar effect can be obtained by urging the fixed transformer winding 18 on the mounting surface on the side of the fixed drum 1 via 16.

Claims

Range of request

1. A magnetic head (21) mounted on a rotating drum (2) rotatably supported on a fixed drum (1) transmits and receives signals to and from the rotating drum (2) in the form of a flat plate. (2a) Mouth attached

Two π η main 冃

In a rotary head device implemented through a rotary transformer winding (18) and a rotary transformer fixed side winding (18) mounted on the fixed drum (1) side with the transformer rotating side winding (17). ,

A rotary head device in which a rotary winding (17) on the rotary drum is biased and mounted on a mounting surface of the rotary drum (2) via an elastic member (16).

2. The elastic member (16) has one or more arm portions (16a, 16a, 16) which are flat and project outward from the engagement portion abutting the rotary transformer winding (17). 16b), and a wiring pattern (22, 23) as an electrical conduction means for electrically connecting the rotary winding (17) to the magnetic head (21). ing

The rotating head device according to claim 1.

3. The elastic member (16) has a plurality of arm portions (16a, 16b) which are flat and project outward from the engaging portion abutting on the rotor winding (17). ), And the mounting positions of the plurality of arms (16a, 16b) on the mounting surface (2a) of the rotary drum (2) sandwich the rotation center of the rotary drum (2). The rotary head device according to claim 1, which is provided at a position.

4. A screw (24) is a means for attaching the elastic member (16) to the attachment surface (2a) of the rotary drum (2).

The rotating head device according to claim 1.

5. The magnetic head (21) attached to the rotating drum (2) rotatably supported with respect to the fixed drum (1) transmits and receives signals to and from the magnetic drum (2). Mouth attached to (2a) — Mouth revolving winding (17) and flat plate attached to the fixed drum (1) side Transformer fixed winding (18) ), The rotary head device implemented via

A rotary head device in which a transformer fixed-side winding (18) is biased and mounted on a mounting surface on a side of the fixed drum (1) via an elastic member.