JPH0720906Y2 - Rotary transformer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a rotary head drum having a rotating magnetic head such as a video tape recorder, and more particularly to a rotary transformer for exchanging signals with the magnetic head and the outside. .

<Outline of the Invention> The rotary transformer of the present invention consists of coupling the input side end parts of the respective transformer coils used for recording signals wound in the rotary transformer inside the rotary transformer core.

<Prior Art> An example of the structure of a conventional rotary transformer of this type is
Shown in the figure.

In FIG. 4, the rotary transformer is roughly divided into a transformer core 1 and a coil (winding) 2.

Coil (winding) for each channel in the transformer core 1
Is provided with a ring-shaped groove 1a for forming
A slit-shaped groove 1b is provided to draw the end of the coil (winding) out of the rotary transformer.

Recording signal input side end 2a, 2 of the coil wound a specified number of turns
The c and the recording signal output side end portions 2b and 2d are drawn out of the rotary transformer through the slit 1b through the hole 1c penetrating the ring groove 1a and the slit groove 1b. As for the rotary transformer coil (winding), one coil is formed for each channel according to the number of video heads, so two heads are two heads, three heads are three heads, and four heads are three heads. Will have four coils formed in the rotary transformer. (FIG. 4 is used for two heads as a representative thereof). FIGS. 5 and 6 are schematic views showing an example of the state of the lead wire of the rotary transformer coil having each conventional video head configuration and the line processing method. The figure is shown.

3 is a rotary transformer.

As you can see from each figure in Fig. 5 and 6, coil (winding)
Is the end 2a, 2c, 2 of the recording signal input side for each coil (winding)
Since there are e, 2g and end portions 2b, 2d, 2f, 2h on the recording signal output side, the number of core wires drawn out of the rotary transformer 3 is 4 for 2 heads, 6 for 3 heads, and 8 for 4 heads. And the number of video heads and the number of coils (windings) are double.

Ends 2a, 2b of the core wire pulled out of the rotary transformer 3
In 2h, the relay work is performed by soldering all of them to the relay board 4 and the like to perform the wire treatment.

The video signal at the time of recording is 2 in the rotary transformer 3 corresponding to the video head which should always record the same 1 signal.
Since it has to be transmitted to one channel, conventionally, the transmission path of the recording signal is divided into two directions by the outside of the rotary transformer 3, for example, the relay substrate 4, etc., and the signal is transmitted to the rotary transformer coil.

<Problems to be Solved by the Invention> In the conventional rotary transformer configuration described above, all the core wires drawn out of the rotary transformer must be relayed to the relay board or the like by soldering or the like.

This is because the area of the board for soldering the lead wires increases as the lead wires increase, and the number of rotary transformer channels increases with the miniaturization, thinning, and head increase. At present, the workability of the line processing work is deteriorated, such as having to carry out a larger number of drawn lines in a smaller space, which is one of the causes of the cost increase.

The present invention pays attention to such a point and has a small number of operations.
Even with a small-area relay board, the rotary transformer coil lead wire can be easily relayed to obtain a rotary head drum with better assemblability and low cost.

<Means for Solving Problems> In order to achieve the above-mentioned object, the present invention connects the input side end parts of the respective transformer coils used in recording the signal of the rotary transformer in the rotary transformer core to form a rotary transformer. Fewer core wires are drawn out.

<Example> An example shown in FIGS. 1, 2, and 3 will be described below.

In FIG. 1, a ring groove 1a for forming a coil (winding) corresponding to each video head for non-contact signal transmission is formed in the rotary transcore 1 as in the conventional case. There is. Also, the slit groove 1b and the through hole 1 for drawing the end of the coil (winding) to the outside of the rotary transformer.
c is shaped.

This rotary transformer structure has an input side end portion 2a of each transformer coil used for recording a signal in the slit groove 1b of the transformer core 1 provided to pull out both ends of the rotary transformer coil to the outside of the rotary transformer. , 2c
It has a structure that connects together and reduces the number of lines drawn out of the rotary transformer.

<Effect of Device> As is clear from the description of the above embodiment, the rotary transformer of the present invention is one in which the input side end of each transformer coil used when recording a signal is connected in the rotary transformer core. is there.

Therefore, the number of coil (winding) ends (core wires) drawn out to the outside of the rotary transformer can be reduced, and the relay work of the core wire can be performed in a shorter time. There is an advantage that line processing can be performed on the substrate, and it is possible to reduce costs.

[Brief description of drawings]

1 (a), (b) and (c) respectively show a rotary transformer of the present invention, wherein (a) is a front view, (b) is a sectional view, (c) is a rear view, and FIG. FIG. 3 is a schematic diagram of a rotary transformer coil lead wire state and coil relay state in the case of having a two-head video head according to the present invention, and FIG. 3 is a rotary transformer coil lead wire state and a coil in the case of having a four-head video head according to the present invention. FIG. 4A, FIG. 4B, and FIG. 4C show a conventional rotary transformer, and FIG. 4A is a front view.
6B is a cross-sectional view, FIG. 6C is a rear view, and FIG. 5 is a schematic diagram of a rotary transformer coil lead wire state and a coil relay state in the case of having a conventional two-head video head based on a rotary transformer, FIG. FIG. 4 is a schematic diagram of a rotary transformer coil lead wire state and a coil relay state in the case where a conventional four-head video head using a rotary transformer is provided. 1 ... core, 2 ... coil, 3 ... rotary transformer, 4 ... relay board.

Claims (1)

[Scope of utility model registration request] 1. A rotary transformer which is used for a rotary head drum of a video tape recorder or the like and which transmits a signal from the head in a non-contact manner, and an input side end of each transformer coil used when recording a signal. A rotary transformer, which is characterized by joining together in a rotary transformer core.