JP3152589B2 - Rotating magnetic head device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary magnetic head device in a magnetic recording / reproducing apparatus such as a VTR, and more particularly to a wiring method between a rotary transformer and a magnetic head.

[0002]

2. Description of the Related Art A conventional rotary magnetic head device will be described with reference to FIG. The rotary magnetic head device basically includes a fixed cylinder 1 for guiding a magnetic tape, a shaft 3 on which a bearing 2 is integrally mounted, a rotary cylinder 4 having a projection 4a, a rotary rotary transformer 5, and a fixed rotary transformer. 6, a magnetic head 7, and a drive motor 8. In assembling, the shaft 3 is fitted to the housing of the fixed cylinder 1 and the outer ring of the bearing 2 is fixed with an adhesive or the like. Further, the fixed-side rotary transformer 6 is bonded and fixed to the fixed cylinder 1.

A magnetic head 7 is fixed to the rotary cylinder 4 by screws, and the magnetic head 7 is electrically connected to the coil lead wire 9 of the rotary rotary transformer 5 by soldering. Thereafter, the rotary rotary transformer 5 is bonded and fixed to the projection 4a of the rotary cylinder 4. Next, after inserting the rotary cylinder 4 into the shaft 3 and adjusting the gap between the rotary rotary transformer 5 and the fixed rotary transformer 6,
The rotating cylinder 4 is bonded and fixed to the shaft 3. A rotating part of a drive motor 8 is arranged on the shaft 3, and a rotating cylinder 4
To obtain the rotational force.

[0004]

When the rotary rotary transformer 5 is bonded to the rotary cylinder 4 with the miniaturization and thinning of the rotary magnetic head device, the rotary rotary transformer 5 and the magnetic head 7 are arranged close to each other. Therefore, a work space for soldering the coil lead wire 9 to the magnetic head 7 cannot be secured, and the above-described work procedure must be taken. Here, from the work surface, it is preferable that the coil lead wire 9 is long so that the soldering operation can be easily performed.
If the lead wire 9 is lengthened, the lead wire 9 is left after the rotation-side rotary transformer 5 is bonded. This extra lead wire 9 is shaped in a hollow state,
Some are left alone. When the rotary cylinder 4 rotates at a high speed, a centrifugal force acts to cause the lead wire 9 to jump out. The lead wire 9
Contact with the fixed cylinder 1 causes phenomena such as rotational fluctuations and disconnections, and cannot function as a rotating magnetic head device, resulting in a lack of reliability. To avoid this,
There is a problem that the coil lead wire 9 cannot be made too long, resulting in poor workability.

[0005]

SUMMARY OF THE INVENTION Accordingly, a rotary magnetic head device according to the present invention includes a step of fixing a cylindrical insulating member to a rotary cylinder and mounting a magnetic head, and a method of magnetically connecting a lead wire of a rotary rotary transformer coil. The process of directly soldering to the pattern of the head-attached base substrate, and with the rotary-side rotary transformer positioned and temporarily fixed to the rotary cylinder with adhesive, rotate the rotary cylinder a little and rotate it to insulate the excess of the lead wires in a cylindrical shape The step of winding around the member and curing the adhesive forms a rotary cylinder. The cylindrical insulating member is made of resin and is formed in an arc-shaped or V-shaped cross section.

In another example, a magnetic head is attached to a rotary cylinder having a cylindrical projection, and the rotary cylinder is temporarily fixed to the rotary cylinder with an adhesive while the rotary rotary transformer is temporarily fixed to the rotary cylinder. The rotation side cylinder is formed by a step of slightly rotating the excess lead wire around the cylindrical projection and curing the adhesive. The cylindrical projection is formed in an arc-shaped or V-shaped cross section.

[0007]

According to the above construction, the surplus portion of the coil lead wire is wound around and fixed to the cylindrical projection formed on the rotary cylinder or on the rotary cylinder itself. The cylinder rotates at high speed without any trouble.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view and a sectional view,
FIG. 2 is a schematic diagram for calculating a coil lead wire length, and FIG. 3 is a plan view and a cross-sectional view of another embodiment. In the figure, the same parts as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted. The difference from the conventional example is a method of shaping a coil lead wire for electrically connecting the rotary rotary transformer and the magnetic head. In FIG. 1, reference numeral 10 denotes a cylindrical insulating member, and the cylindrical insulating member 10 is formed into an arc-shaped cross section or a V-shaped cross section and molded from a resin material.

In assembling, the cylindrical insulating member 10 is fixed to the projection 4a of the rotary cylinder 4 by press-fitting or fixed with an adhesive or the like. Next, the coil lead wire 9 of the rotary transformer 5 is directly soldered to the pattern 7a of the magnetic head mounting base substrate. The center of the rotary-side rotary transformer 5 is positioned on the protrusion 4a of the rotary cylinder 4 using an assembling jig (not shown) and temporarily fixed with an adhesive. Thereafter, the rotary cylinder 4 is rotated slightly, and the excess of the lead wire 9 is wound around the cylindrical insulating member 10 to cure the adhesive.

The length of the coil lead wire 9 is, for example, as shown in FIG.
If the outer peripheral radii of the cylindrical insulating member 10 and the outer peripheral radius of the rotary rotary transformer 5 are R1 and R2, respectively, and the length of the coil lead wire 9 is L, the phase angle at which the rotary cylinder 4 is rotated is adjusted. θ is

[0011]

(Equation 1)

[0012] In fact, the leader 9
It is necessary to design the length in consideration of the variation in the coil length, but there is an advantage that the length of the lead wire can be freely set, and the workability is extremely improved. In the present invention, since the cross-sectional shape of the cylindrical insulating member 10 is formed in an arc shape or a V-shape, when the rotary cylinder 4 is rotated, the coil lead wire 9 is automatically placed at the center of the cylindrical insulating member 10. It is wound up. Therefore, there is no concern that the lead wire 9 enters between the protrusion 4a and the rotary rotary transformer 5. In addition, if an adhesive requiring a curing time of several tens of seconds is selected as the anaerobic adhesive used for bonding the projection 4a and the rotary rotary transformer 5, a sufficient time for the operation of rotating the rotary cylinder 4 a little is possible. Can be secured.

Referring to FIG. 3, another embodiment will be described. In the figure, the shape of the protrusion 3b of the rotary cylinder 4 is
It is formed in an arc-shaped or V-shaped cross section. Therefore, a cylindrical insulating member is unnecessary. The assembling method is the same as in the above-described embodiment. That is, after the rotary rotary transformer 5 is positioned and fixed, the lead wire 9 wound around the projection 4b is coated with, for example, an ultraviolet-curable adhesive 11 as an insulating material, and is cured by irradiating ultraviolet rays. Thus, the insulating member 10 is substituted. Also, instead of applying and curing an insulating material on the surface of the protrusion 4b, a lead wire 9 is previously formed.
May be covered with an insulating material.

[0014]

According to the above configuration, the coil lead wire of the rotary rotary transformer is directly soldered to the magnetic head, and the surplus lead wire is wound around the insulating member provided on the rotary cylinder. The length can be freely set, and the workability of soldering is greatly improved. or,
It is effective as a low-cost, highly reliable rotating magnetic head device.

[Brief description of the drawings]

FIG. 1 is a plan view and a sectional view of a rotating magnetic head device.

FIG. 2 is a schematic diagram for calculating a coil lead wire length.

FIG. 3 is a plan view and a cross-sectional view of a rotary magnetic head device of another example.

FIG. 4 is a sectional view of a conventional rotary magnetic head device.

[Explanation of symbols]

 Reference Signs List 4 rotating cylinder 4b cylindrical protrusion 5 rotating rotary transformer 7 magnetic head 9 coil lead wire 10 cylindrical insulating member 11 insulating material (adhesive)

Claims (4)

(57) [Claims] 1. A rotary magnetic head device comprising a rotary cylinder provided with a magnetic head and transmitting signals via rotary and fixed rotary transformers, wherein a cylindrical insulating member is fixed to the rotary cylinder and a magnetic head is provided. Attaching the lead wire of the rotary rotary transformer coil directly to the pattern of the magnetic head mounting base substrate; and temporarily positioning the rotary rotary transformer on the rotary cylinder with an adhesive. Rotating the rotary cylinder for a short time, winding the excess of the lead wire around the cylindrical insulating member, and curing the adhesive, thereby forming the rotary cylinder. Magnetic head device. 2. The rotary magnetic head device according to claim 1, wherein said cylindrical insulating member is a resin cylinder formed in an arc-shaped or V-shaped cross section. 3. A rotary magnetic head device comprising a rotary cylinder provided with a magnetic head and transmitting signals via rotary and fixed rotary transformers, wherein the magnetic head is mounted on the rotary cylinder having a cylindrical projection. Attachment step, in a state where the rotary-side rotary transformer is temporarily fixed to the rotary cylinder with an adhesive, the rotary cylinder is slightly rotated, and the excess of the lead wire is wound around the cylindrical projection, And a step of curing the adhesive to form the rotating cylinder. 4. The cylindrical projection has an arc-shaped cross section or a V-shaped section.
4. The rotating magnetic head device according to claim 3, wherein the rotating magnetic head device is formed in a letter shape.