JPH08741Y2 - Coaxial rotary transformer - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coaxial rotary transformer used in a rotary magnetic head used in a video tape recorder or the like.

[0002]

2. Description of the Related Art A sectional view of a conventional coaxial rotary transformer is shown in FIG. In this conventional example, a ring-shaped ferrite core 1 having a coil mounting groove 2 formed on the inner peripheral surface thereof is laminated via a short ring 4 and mounted on a holder 3, and an outer peripheral surface is provided with a coil mounting groove. The ring-shaped ferrite core 6 in which 7 is formed is laminated via the short ring 8 and is attached to the holder 5.

[0003]

[Problems to be Solved by the Invention] In the conventional coaxial type rotary transformer, in order to improve the crosstalk characteristics between the channels, the ring-shaped ferrite cores in which the coils for the respective channels are arranged are separated from each other. A conductive short ring was inserted between the cores. And
This conductive short ring is conducted to a metal holder to which the core is adhered and grounded to the circuit ground of the video tape recorder to improve crosstalk.

However, despite the fact that the metal holder and the conductive short ring are fitted to each other in size, contact failure often occurs between the metal holder and the conductive short ring, which is not desirable. There was a problem that the crosstalk characteristics could not be obtained.

Further, if the fitting dimension is made strict in order to obtain conduction between the metal holder and the conductive short ring, when the conductive short ring is inserted into the metal holder during assembly work, it is extremely difficult to insert the conductive short ring. There was a problem that became.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotary transformer in which the conductive short ring can be surely connected to the ground and the assembling work is easy.

[0007]

DISCLOSURE OF THE INVENTION The present invention relates to a coaxial rotary transformer comprising a rotor formed by laminating ring-shaped ferrite cores and a stator formed by laminating ring-shaped ferrite cores, wherein the rotor or stator is A short ring made of a conductor is inserted between the laminated ring-shaped ferrite cores, and the cross section of the short ring is L-shaped.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is an enlarged sectional view of the essential parts of an embodiment according to the present invention. The overall configuration of this embodiment is similar to that of FIG. FIG. 2 is a partial cross-sectional perspective view of a short ring according to an embodiment of the present invention. In this embodiment, a ring-shaped ferrite core 11 having a groove 14 for arranging a coil formed on the inner peripheral surface thereof is laminated with a short ring 12 interposed therebetween, and the holder 1
It is attached to 3. This short ring 12
The cross-sectional shape is L-shaped, and the ring-shaped ferrite core 11 is attached according to the L-shape. The short ring 12 uses the space between the ring-shaped ferrite core 11 and the holder 13 and is fixed with an adhesive or the like.

As described above, the short ring of the present invention is
The electrical connection with the holder can be surely made, and desired crosstalk characteristics can be stably obtained.

[0010]

According to the present invention, the grounding of the short ring can be surely performed, and desired crosstalk characteristics can be obtained.

[Brief description of drawings]

FIG. 1 is an enlarged view of a main part of an embodiment according to the present invention.

FIG. 2 is a partial cross-sectional perspective view of a short ring according to an embodiment of the present invention.

FIG. 3 is a sectional view of a conventional example.

[Explanation of symbols]

 1, 6, 11 Ring-shaped ferrite core 2, 7, 14 Coil mounting groove 3, 5, 13 Holder 4, 8, 12 Short ring 15 Space

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroto Ideno, 12-33 Minamieicho, Tottori City, Tottori Prefecture Hitachi Ferrite Co., Ltd. (72) Toshiyuki Sanada 33-12, Minamieicho, Tottori City, Tottori Prefecture Kazuyuki Shimono, Examiner, Ferrite Co., Ltd.

Claims (1)

[Scope of utility model registration request] 1. A coaxial rotary transformer comprising a rotor formed by laminating ring-shaped ferrite cores and a stator formed by laminating ring-shaped ferrite cores,
The rotor or the stator is composed of a plurality of ring-shaped ferrite cores, a short ring made of a plurality of conductors having an L-shaped cross section, and a holder, and the short rings are provided between the ring-shaped ferrite cores and the ring-shaped ferrite cores. A coaxial rotary transformer, wherein the coaxial rotary transformer is arranged between a ferrite core and a holder, and a gap formed by the thickness of the short ring is formed between the holder and the ring-shaped ferrite core.