JPS61255501A - Structure of rotary transformer - Google Patents

Abstract

PURPOSE:To obtain a compact rotary transformer by forming a current closed circuit with series connection secured between a coil wound round two magnetic heads and a rotary winding and connecting a stator winding electromagnetically to the rotary winding. CONSTITUTION:The recording signal is impressed to a stator winding 13d in a recording mode and the same signal is supplied to magnetic heads 12d and 12e with electromagnetic induction via a rotary winding 12c. Thus a magnetic head which has a contact with a magnetic tape for each 180 deg. rotation is changed with each other and therefore the voice data are recorded on the magnetic tape by the magnetic head having a contact with the tape. In a reproduction mode, the magnetic head also has a contact with the tape for each 180 deg. rotation. Thus the recorded signals are read alternately out of the tape by each head and emerge at the winding 13d continuously. These signals are used for reproduction. Thus it is possible to miniaturize a rotary transformer which can be applied to an audio device.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application> The present invention relates to a rotary transformer structure, and in particular, the present invention relates to a rotary transformer structure, in which a head is rotated while being inclined relative to a magnetic tape, and a magnetic tape is generated by the head (rotary head). A digital audio device that digitally writes audio onto tape or reads audio data from magnetic tape and plays it back.
Regarding the rotary transformer structure in R-DAT).

<Prior Art> A video tape recorder (VTR) is a recording/reproducing system using a rotating head. In such a VTR, a rotary transformer is used to send a recording signal to a rotary head or to receive a reproduction signal from a rotary head. In such a rotary transformer, (two stator windings, first and second, are disposed on the fixed drum so as to surround the motor shaft inserted through the fixed drum; Two rotary windings, first and second, which are electromagnetically coupled to the first and second stator windings, are provided on a rotating drum that rotates integrally to surround the motor shaft, and (cl first stator winding) A first recording/reproducing magnetic head is provided on the periphery of the rotating drum corresponding to the stator winding and the first rotary winding, and a rotating drum is provided corresponding to the second stator winding and the second rotary winding A second magnetic head for recording and reproducing is provided at the periphery of the first magnetic head at an interval of 180 degrees from each other, and (during recording, a video signal is alternately applied to the first and second stator windings, As a result, video signals are alternately recorded on the magnetic tape by the first and second magnetic heads, and (during FL playback, the video signals are alternately read from the magnetic tape by the first and second magnetic heads; 1. Since the video signal appears on the first and second stator windings via the second rotary winding, images are reproduced on the cathode ray tube by reading the video signals from the first and second stator windings alternately. be able to.

<Problems to be solved by the invention> As mentioned above, the conventional structure uses two sets of port-to-tally transformers even when it does not have a monitor function, and it also has a shield ring to shield between each transformer. Because of its structure, its shape is quite large, which is a problem in the R-DAT, which is required to be smaller.

This problem requires simultaneous recording and monitoring.
DAT is becoming more and more prominent because it requires two magnetic heads for recording and two magnetic heads for reproduction.

From the above, an object of the present invention is to provide a rotary transformer structure that can be used in an R-DAT that can be miniaturized.

Another object of the present invention is to provide a rotary transformer structure that requires the same size as the conventional one even for simultaneous recording and monitoring.

Means for Solving Problems〉 The rotary transformer structure of the present invention includes (a) disposing a stator winding on a fixed drum, and (
A rotary winding electromagnetically coupled to the stator winding is provided on a rotary drum that rotates together with the bl motor shaft, and (c) a peripheral portion of the rotary drum is provided corresponding to the pair of stator winding and rotary winding. Two recording and reproducing magnetic heads are provided at an interval of 180 degrees from each other, and fd) a coil wound around each magnetic head and a rotary winding are connected in series to form a closed circuit. In the case of simultaneous recording and monitoring, two sets of stator windings and rotary windings are provided, and two magnetic heads are connected to each set at an interval of 180° from the other set. The coils are arranged at 90° intervals with respect to the magnetic heads of each set, and the coils wound around the two magnetic heads of each set are connected in series to form a current closed circuit.

<Function> In R-DAT, whether during recording or reproduction, recording or reproduction can be performed mechanically every half rotation using the first and second magnetic heads (recording/reproducing heads). .

For example, during recording, the same signal may be input to two magnetic heads, and the magnetic head in contact with the magnetic tape may record audio data on the magnetic tape, and during playback, the magnetic head in contact with the magnetic tape may record audio data on the magnetic tape. The audio data read from the head may be used for reproduction. Therefore, it is possible to form a current closed circuit by connecting the coils wound around the two magnetic heads and the four-tally winding in series. With this configuration, there is no need for two sets of transformers as in the past, and it is only necessary to input the recording signal to the stator winding during recording, and read the reproduced signal from the stator winding during playback. Therefore, the size can be reduced. can.

In addition, in the case of simultaneous record monitoring, two magnetic heads for recording and two magnetic heads for reproduction are required, so as for the transformer, it is only necessary to provide a transformer for reproduction and a transformer for recording respectively. It can be constructed with a size comparable to that which cannot be monitored.

<Example> Figure 1 is an explanatory diagram of a rotary transformer according to the present invention, in which (A) is a back view of a rotating drum, (B) is a sectional view, and (C) is a diagram showing the magnetic head arrangement. The figure (D) is a wiring diagram.

The rotary transformer has a rotating drum 12 fixed to a motor shaft 11 so as to be rotatable together with the shaft, and a fixed drum 13 through which the motor shaft 11 is pushed.

The rotating drum 12 includes a circular body 12a and a body 12.
ferrite core 12b formed on the back surface of a, and ferrite core 12b surrounding the motor shaft 11.
a rotary winding Ill 2 c embedded in the rotary winding Ill 2 c, and first and second magnetic heads 12 d for both recording and reproduction, which are arranged at an interval of 180° from each other around the periphery of the circular body 12 a.
It has 12 e.

The fixed drum 13 has a concave body 13a, a hole 13b for inserting the motor shaft 11, a ferrite core 13c formed at the bottom of the body 13a, and a stator winding @13d buried in the ferrite core 13c concentrically with the hole 13b. have. In addition, the stator winding 13d is a rotary winding $
12c to form a transformer. Each of the magnetic heads 12d and 12e has a coil CL1.
．． CL2 is wound around, and each coil CLI, CL2 and the rotary winding 12c are connected in series and form a closed circuit as shown in FIG. 1(D).

From the above, during recording, the magnetic head 12d contacts the magnetic tape (not shown) alternately every half rotation.

Audio data is recorded on magnetic tape via 12e,
During playback, audio data is read from the magnetic tape.

That is, if a recording signal is applied to the stator winding 13d during recording, and the same signal is inputted to the two magnetic heads 12d and 12e via the rotary winding 12c by electromagnetic induction, the magnetic tape will be rotated every 180°. Since the magnetic head in contact with the tape changes, audio data can be recorded on the magnetic tape using the magnetic head in contact with the tape. Similarly, during reproduction, the magnetic heads contact the magnetic tape alternately every 180° rotation, and the recorded signals are read from the magnetic tape alternately by each magnetic head, and the read recorded signals appear continuously on the stator winding 113d. It is sufficient to perform reproduction processing using the signal from.

FIG. 2 is an explanatory diagram of another rotary transformer structure according to the present invention, which is a rotary transformer structure for simultaneous recording and monitoring. Figure 2 (A) is a back view of the rotating drum, Figure 2 (B) is a sectional view, Figure 2 (C) is a magnetic head arrangement diagram, and Figure 2 (D) is a wiring diagram, which is the same as Figure 1. The same reference numerals are given to the parts.

The difference from FIG. 1 is that (two sets of al stator windings and rotary windings are provided for reproduction and recording; that is, the rotary winding for reproduction (monitoring) is provided on the ferrite core 12b of the rotating drum 12. Line 12 c-p and recording rotary winding 12
stator windings 13d-p for reproduction and stator windings 4313 d-r for recording are buried concentrically in the ferrite core 13c of the fixed drum 13, respectively, and the corresponding rotary windings are buried concentrically. line 12c
(b) Two stator windings 13 d-p, 13 d-
r and between the two rotary windings 12 cmp.

A ring 13e for shielding between 12c and r.

13f is a ferrite core 13C212 concentric with each winding.
(C) The two recording magnetic heads Ra and Rh are buried in the
A magnetic head Pa for reproduction at an interval of 0°.

Similarly, the playback head Pa (Pb) for reproducing and monitoring the audio signal written by the recording head Ra (Rh) is placed at a position 270° in the opposite direction of rotation from the position of the recording head. (The coils CLp-1, ct, p-2 wound around the two magnetic heads Pa and Pb for DL reproduction and the rotary winding 12c-p for reproduction are connected in series. 1 current block and two magnetic heads Ra, R for recording.
Coils CLr-1 and CLr-2 wound around b and rotary winding I for recording! 12a-r are connected in series to form a second current closed circuit.

From the above, (a) during recording, the recording head Ra contacts the magnetic tape (not shown) alternately every half rotation.

Audio data is recorded on magnetic tape via Rh, (b
) During playback, audio data is read from the magnetic tape via the playback heads Pa and Pb that contact the magnetic tape every half rotation; (C) During recording and simultaneous monitoring, the playback head Pa monitors playback while writing with the recording head Ra; Also, while writing is performed using the recording head Rb, monitoring is performed using the reproducing head pb.

That is, during recording, the recording stator windings 13d-r
A recording signal is applied to the rotary winding 1 by electromagnetic induction.
2 If the same signal is input to the two recording heads Ra and Rh through c-r, the recording head in contact with the magnetic tape changes every 180° rotation, so the recording head in contact with the magnetic tape will All you have to do is record the audio data on tape.

Also, during playback, the playback head Pa is rotated alternately every 180° rotation.

pb comes into contact with the magnetic tape, recording signals are read from the magnetic tape alternately by each playback head, and the read signals appear continuously on the stator windings 13d-p for playback, so the playback process is performed using the signals. All you have to do is and,
For simultaneous recording and monitoring, the above-mentioned recording and reproduction processing may be performed simultaneously.

<Effects of the Invention> According to the present invention, a stator winding is disposed on a fixed drum, and a rotary winding electromagnetically coupled to the stator winding is disposed on a rotating drum that rotates integrally with a motor shaft. Two windings are arranged at a distance of 180° from each other on the periphery of the rotating drum corresponding to the set of stator windings and rotary windings.
A rotary transformer was constructed by providing two magnetic heads for both recording and reproduction, and connecting the coils wound around each magnetic head and the rotary winding in series to form a current closed circuit.
It is not necessary to provide a transformer for each head, and a small rotary transformer can be provided.

Further, according to the present invention, two magnetic heads for reproduction monitoring and two magnetic heads for recording are provided, one rotary transformer is provided for each reproduction monitoring head, and each recording magnetic head is provided with one rotary transformer for each reproduction monitoring head. Since the rotary transformer for simultaneous recording and monitoring can be constructed by providing one rotary transformer for each, its shape can be made small, and the size can be made comparable to that of a conventional rotary transformer that cannot perform simultaneous recording and reproduction.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of a rotary transformer according to the present invention, in which (A) is a back view, (B) is a sectional view of a rotating drum, and (C) is a magnetic head arrangement diagram. Same figure (
D) is a wiring diagram, FIG. 2 is an explanatory diagram of another embodiment of the rotary transformer according to the present invention, and FIG.
Figure CB) is a sectional view of the rotating drum, Figure 3C is a magnetic head arrangement diagram, and Figure 3D is a wiring diagram. 11...Motor shaft, 12...Rotating drum, 12b...Ferrite core, 12
c... Rotary winding, 12d, 12e... Magnetic head, 13... Fixed drum, 13c... Ferrite core 13d
・Stator winding,

Claims (4)

[Claims] (1) A stator winding is disposed on a fixed drum, and a rotary winding electromagnetically coupled to the stator winding is disposed on a rotating drum that rotates integrally with the motor shaft;
Two magnetic heads are provided around the periphery of the rotating drum at an interval of 180 degrees, corresponding to the set of stator windings and rotary windings, and the coils wound around each magnetic head and the rotary windings are connected in series to generate current. A rotary transformer structure characterized by a closed circuit. (2) The two magnetic heads are each a magnetic head for both recording and reproduction.
The rotary transformer structure described in section 1). (3) Two sets of stator winding and rotary winding are provided,
Two magnetic heads corresponding to each set are provided at an interval of 180° from each other and an interval of 90° from the magnetic head of the other set, and a coil and a rotary coil are wound around the two magnetic heads for each set. The rotary transformer structure according to claim 1, wherein the rotary transformer structure is formed by connecting windings in series to form a current closed circuit. (4) Claim (3) characterized in that the two magnetic heads of the first set are recording magnetic heads, and the two magnetic heads of the second set are magnetic heads for reproduction. rotary transformer structure.