JPS5998509A - Rotary transformer - Google Patents

Abstract

PURPOSE:To transmit a signal and improve working efficiency by mounting an insulating film where a signal transmitting coil is wound to the core and also mounting flexible printed wiring substrate which can transmit a signal sent from the coil to the edge of coil. CONSTITUTION:Two grooves 9 and 10 for first and second channels are formed coaxially on the surface of core 8 and the groove 11 for eliminating crosstalk is also formed therein. The grooves 12, 13 for extracting coil are formed toward the external side from the groove 10. The coils 14, 15, 16 are formed on the insulating coils 17, 17, 17, the insulating film is inserted into the grooves 9, 10, 11 and the edge is connected to the printed circuit substrates 18, 19 for lead out. Thereby, the coils 14, 15 for transmitting signal can be formed.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotary transformer used in a magnetic recording/reproducing device having a rotating magnetic head and transmitting signals between a rotating head section and a fixed section.

(Prior Art) Among rotary transformers commonly used in the past, for example, a two-channel rotary transformer is shown in FIGS. That is, a core is formed in an annular shape from ferrite I, and two concentric grooves 2 and 3 for signal transmission are formed on one surface of the core.

A groove 5 for drawing out a copper wire was formed deeper than 3 and extending outward from the inner groove.

And one groove for signal transmission, copper wire t in 3, 7
It is wrapped in a layer several times and grooved by glue.

It was fixed within 3. Further, the ends of the copper wires t and 7 were drawn out from the drawing groove j. Although only one core is shown in the drawings, a pair of upper and lower cores configured as described above are provided, and signals are transmitted between the copper wires provided above and below.

(Problem to be Solved by the Invention) However, in the above-mentioned conventional rotary transformer, the ends of the copper wires t and 7 wound in the signal transmission grooves 3 and 3 are pulled out from the grooves 2.3. It was not possible to wind the copper wires z and 7 around one groove 3, resulting in poor work efficiency. Also,
The conventional rotary transformer has the disadvantage that a special winding machine is required to further wind the copper wires t, 7, resulting in high costs.

(Means for Solving the Problems) The present invention aims to eliminate the above-mentioned drawbacks of the conventional technology, and involves forming a coil that functions as a copper wire on a film by etching or the like and attaching it to the core. be.

(Example) The present invention will be described below according to the example shown in FIGS. 3 and 7. First, the core ♂ is formed into an annular shape using ferrite or the like. Grooves 2 and 10 for the first channel and the grooves 10 for the first channel are formed concentrically on one surface of the core ♂.
/ indicates the two grooves 2. It is formed between IO. Furthermore, each of the grooves 2. /θ, // Deeper groove for pulling out the coil outward from the groove 10 for the first channel /J,
Two /Js are formed. In addition, the grooves 9.10. /
The coils /4t, /, 5/2, which are inserted in / to transmit signals and remove crosstalk, are covered with an insulating film /7. by etching or lamination. /7. /7
It is formed on the surface or the middle part of. Each coil /g, /, 5. is formed in accordance with the shape of the groove 2, /θ, // formed in the core ♂. Groove /l, 10. // and the coils for the first and second channels/
15, a flexible printed wiring board/♂,
/2 is installed and the groove for the drawer /-? .

/3 and the signal is connected to other parts. Note that, like the conventional example, only one core ♂ is shown in the drawing, but the cores configured as above are provided in pairs, one above the other, and signals are transmitted between the coils provided above and below. .

Therefore, in the rotary transformer in the above embodiment, the coils are attached to the insulating films /7, /7, /7.

/6. /l, and the insulating film /7°/7. /
7 to groove 7.10. You can easily create a signal transmission coil by simply inserting it into // and connecting the end to the printed wiring board /♂, /2 for signal transmission. /,! It has excellent workability as it can be used to install coils/4t.
,/,5. Since a special device for winding /l is not required, costs can be reduced. In addition, since coils /4' and /j are formed from thin copper foil, they have excellent high frequency characteristics with little skin effect, and can easily form short coil /2 for crosstalk removal. There are advantages.

(Effects) As described above, in the rotary transformer of the present invention, an insulating film on which a coil for transmitting signals is formed is attached to the core, and a flexible film is attached to the end of the coil for transmitting signals from the coil. Since the printed wiring board is attached to the core and signals are transmitted, work efficiency can be improved and costs can be reduced.

In addition, it has excellent high frequency characteristics because it has little skin effect.

[Brief explanation of drawings]

Fig. 1 is a plan view of a conventional rotary transformer, Fig. 2 is a cross-sectional side view of a conventional rotary transformer, Fig. 3 is a plan view of a rotary transformer according to an embodiment of the present invention, and Fig.・
・Core, /4', /,5...Signal transmission coil, /7
...Insulating film, /♂, /ri...Printed wiring board. Agent Patent attorney Aihiko Fukushi (other names)/4
:IyJ2 Figure 1615 Figure 4

Claims (1)

[Claims] 1. An insulating film on which a coil for transmitting signals is formed is attached to the core, and a flexible printed wiring board attached to the end of the coil and transmitting signals from the coil is attached to the core to transmit signals. A rotating transformer characterized by performing the following.