JPS60229202A - Rotary transformer - Google Patents

Abstract

PURPOSE:To improve S/N by providing a recording winding and a reproducing winding having different winding ratios to an opposing rotor winding to reduce the recording voltage and power consumption and applying a sufficient reproducing voltage. CONSTITUTION:The winding 16 for the 1st channel recording and the reproducing winding 17 of a stator 10 are arranged in parallel in a slot 11 in the radial direction and the winding 18 for the 2nd channel recording and the reproducing winding 19 are arranged in parallel in the slot 13 in the radial direction. Then the winding ratio of a winding 29 of the rotor 25 opposed to the winding 16 is selected as 1:1, the winding ratio between the windings 17 and 29 is selected as 2:1 and the winding ratio between the winding 18 and the winding 21 of the rotor 25 and the winding ratio between the windings 19 and 31 are selected similarly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applied to a rotary transformer, for example, a small V
The present invention relates to a rotary transformer used in a TR, etc., which can reduce the recording voltage and obtain a sufficient reproduction voltage.

BACKGROUND OF THE INVENTION In prior art, for example, small household VTRs, rotary transformers are used for transmitting and receiving signals between a rotary head and a circuit. The rotary transformer is provided on the rotor side and stator side of the drum, and for signal recording, it is better to set the winding ratio of these to 1=1 in order to reduce the recording voltage and reduce power consumption. , S for signal reproduction
For the purpose of increasing the N ratio, it is better to set the winding ratio to about 2:1.

Problems to be Solved by the Invention However, as shown in FIGS. 7 and 8, conventional rotary transformers use the same windings for both recording and reproduction.
An example of switching between recording and playback using a relay (Figure 7), and an example of switching between recording and playback using a transistor (Figure 8)
There is. In the one shown in FIG. 7, during recording, the signal input to the terminal 1 is transferred to the recording amplifier 2. Relay 3. While the signal is supplied to the head 5 via the rotary transformer 4, the signal from the head 5 is supplied to the rotary transformer 4 during the re-excursion. Relay 3. It is taken out from the terminal 7 via the reproduction amplifier 6.

In the case shown in FIG. 8, during recording, the transistor , transistor x 1
is turned on, transistor x2 is turned off, and the signal from head 5 is transferred to rotary transformer 4. DCI stop capacitor C2
, taken out from the terminal 7 via the reproduction amplifier 6.

In this way, the conventional rotary transformer described above uses the same winding for both recording and reproduction, so either one or both of the recording voltage and reproduction voltage must be sacrificed, resulting in high power consumption. There was a problem with the poor signal-to-noise ratio.

In addition, in the case of the one in Figure 8, if the voltage between the collector and emitter of the transistor becomes negative, when the recording voltage is 4Vp-p, the off state cannot be maintained in that page part and distortion occurs. , in order to prevent this, the transistor ×
1 is provided at D06V, and transistor x 2 is provided at DCOV. As a result, there is a problem in that recording/reproduction cannot be switched quickly due to the charging/discharging time constants of the capacitors C+ and C2.

Means for Solving the Problems and Their Effects The present invention provides a recording winding and a reproducing winding, each having a different turn ratio with respect to the opposing rotor winding, as the winding for one channel of the stator. The above problem has been solved by using a structure in which the winding with fewer turns is used as the recording winding and the one with the larger number of turns is used as the reproducing winding, and the recording voltage can be reduced to reduce power consumption. It is an object of the present invention to provide a rotary transformer that can provide sufficient voltage and a high signal-to-noise ratio. Each embodiment will be described below with reference to the drawings.

Embodiment FIG. 1 (A) 7 shows the first rotary transformer according to the present invention.
A vertical cross-sectional view of an example is shown. Reference numeral 10 denotes a stator made of ferrite, and the plan view seen from the winding side is as shown in FIG.

Apply satin finish to the areas that are not holes). 11 is a groove for the first channel winding, 12 is a groove for the short ring, and 13 is a groove for the second channel winding, which are provided concentrically in the stator 10 in this order from the outside to the inside.

Reference numeral 14 denotes a leader line groove, which is provided in a longitudinal direction approximately perpendicular to the longitudinal direction of the grooves 11, 12, and 13, and its depth is equal to that of the groove 1.
1.12.13. Reference numeral 15 denotes a hole for a leader line, which is bored in the center of 14. Four grooves 14 are provided in the stator 10 at equal intervals in the circumferential direction.

16 is a first channel recording winding, and 17 is a first channel reproducing winding, which are housed in parallel in the groove 11 in the radial direction. 18 is a second channel recording winding, and 19 is a second channel reproducing winding, which are housed in parallel in the groove 13 in the radial direction. A short ring 20 is housed in the groove 12.

Reference numeral 21 denotes a first channel reproduction winding lead wire, and 22 a first channel recording winding lead wire, which are led out to the outside of the stator 10 through the hole 15. The winding lead wire for the second channel reproduction and the winding lead wire for the second channel recording are also connected to the hole 15.
It is drawn out to the outside of the stator 10 via. .

By the way, if the purpose is to improve the playback image quality, it is sufficient to reduce the loss caused by the playback winding 17.19, but the loss caused by the recording winding 16.18 increases the power consumption of the recording amplifier 2. However, it does not affect the degree of deterioration of the playback image quality, so the main purpose is to improve the playback image quality). Therefore, in this case, the playback winding 17.19, which has a large number of turns, is replaced by the recording winding 16.18.
The resistance value per unit number of windings is made small by placing the windings on the inside, and the magnetic coupling with the windings provided on the rotor side is made tight as in the second embodiment mentioned above.

25 is a rotor made of ferrite, and is provided opposite to the stator 10. 26 is a first channel winding groove;
7 is a groove for the short ring, and 28 is a groove for the second channel winding.
-925, are provided concentrically in this order from the outside to the inside.

29 is a first channel winding, and 31 is a second channel winding, each of which is housed in 11126.28. In addition,
Although the short ring is not housed in the groove 27, it may be housed if necessary.

Here, the turn ratio of the recording winding $1116 and the winding 29 is selected to be, for example, 1:1, and the reproduction winding 17 and the winding 2
The turns ratio with respect to 9 is selected to be 2:1, for example. The turn ratio between the recording winding 18 and the winding 31 and the turn ratio between the reproduction winding 19 and the winding 31 are also selected as described above.

Here, FIG. 1(B) shows the relationship between the position of each winding and leakage magnetic flux. 35, 36, 37 are windings 16, 17, 2 respectively
9 is the leakage magnetic flux, and 38 is the main magnetic flux. This is due to the fact that the winding 29 is not provided in a position exactly opposite to the recording winding [116 and the reproducing winding 17], so there is no leakage. Magnetic flux is relatively large.

Therefore, as shown in FIG. 3, the rotor 25' has a groove 26'
is made smaller than that of the first embodiment, and the winding 29 is housed in the groove 26' of the rotor 25' opposite the regeneration winding 17 of the sluter 10. If J is like this, the playback volume [117
leakage magnetic flux can be reduced, and a sufficient reproduction voltage can be obtained.

However, if the portion facing the recording winding 16 is made low 925', the leakage magnetic flux of the recording winding 16 increases, which is not preferable.

FIG. 4 shows a longitudinal sectional view of a second embodiment of the rotary transformer according to the present invention that eliminates the above-mentioned disadvantages, and in the figure, the same parts as in FIG. 1(A) are designated by the same numbers. The explanation will be omitted. 40 is a rotor with grooves 2 similar to the first embodiment.
6, 27, and 28 are provided, the winding 26 is housed in the groove 26°28 facing the reproducing winding 17, and the winding 31 facing the reproducing winding 19, respectively. 41 and 42 are insulators made of non-magnetic or diamagnetic material (e.g. ceramic or resin), which are formed in a ring shape, and there is no winding 26 or 31 in the groove 26 or 28. By doing so, the magnetic coupling between the reproducing winding 17 and the winding 29° and the one reproducing winding and the winding 31 can be made tight, and the recording windings 16 and 18 can be tightly coupled. The leakage magnetic flux can be reduced, and the spacer 41.42 allows the winding 29.31 to be connected to the groove 2.
6.28.

Figure 5 shows a circuit diagram when the windings of the rotary transformer of the present invention are switched by a relay during recording and playback, and in the figure, the same parts as in Figure 7 and Figure 1 (A) are given the same numbers. Therefore, the explanation will be omitted.

During recording, the relay 3 is connected to terminal a, and the recording signal is sent to the recording windings 16, 18, . It is fed to the head 5 via windings 29,31. During playback, the relay 3 is connected to the terminals, and the playback signal from the head 5 is sent to the windings 29, 31. Regeneration winding 1
'7,19. The signal is taken out from a terminal 7 via a reproducing amplifier 6.

Figure 6 shows a circuit diagram when the winding of the rotary transformer of the present invention is switched by a transistor during recording and reproduction.
, in the figure, the same parts as in FIG. 8 and FIG. 1 (A>) are given the same numbers and their explanation is omitted. During recording, transistor On the other hand, during reproduction, transistor x3 is off and transistor x4 is off.

×5 is turned on. Since the operations during recording and reproduction can be easily understood from the explanation of the operations in FIG. 5, the explanation thereof will be omitted.

In addition, in FIG. 6, during recording, the recording voltage is
17.19 is also applied, but transistors X4,
Since s is off and the input impedance of the reproducing amplifier 6 is high, there is no particular problem.

Further, since the semi-fixed resistor R, l-transistor X5 is not a part through which the recording signal flows, there is no particular problem even if it is omitted.

Modifications In addition to using windings as in the first and second embodiments, printed coils may be used to provide the same winding arrangement as in these embodiments.

Also, leave the winding 29 (31) of the 〇-ta 25 in the same position, and replace the recording winding 16 (18) with the reproducing winding 17 (19).
It may also be arranged on the inner side of the windings 31 so as to face the two windings (31). In this way, the recording winding 16 (
18) leakage magnetic flux can be reduced, and power consumption can be reduced.

Effects As described above, the rotary transformer according to the present invention includes a recording winding and a reproducing winding having different turn ratios with respect to the opposing windings as windings for one channel of the stator. Since the winding with fewer turns is used as a recording winding, and the one with more turns is used as a reproducing winding, the recording voltage can be reduced to reduce power consumption, and the reproducing voltage can be sufficiently set to increase the S/N ratio. Moreover, since the recording winding and the reproducing winding are independent, there is no influence of the charging/discharging time constant of the DC blocking capacitor when switching between recording and reproducing, and this switching can be performed quickly. In addition, since the recording winding and the reproducing winding are arranged side by side in the radial direction of the stator in one groove provided in the stator, the depth of the groove can be made relatively shallow. has.

[Brief explanation of the drawing]

Figures 1 (A) and (B) are longitudinal cross-sectional views of a first embodiment of the rotary transformer of the present invention and diagrams showing the relationship between the position of each winding and leakage magnetic flux, and Figure 2 is a diagram showing the relationship between the position of each winding and leakage magnetic flux. FIG. 3 is a plan view of the stator, FIG. 3 is a view showing the regeneration winding and rotor winding facing each other, FIG. 4 is a longitudinal sectional view of the second embodiment of the rotary transformer of the present invention, and FIGS. 5 and 6 are A circuit diagram of a recording/reproducing switching circuit used in the rotary transformer of the present invention,
FIGS. 7 and 8 are circuit diagrams of eight examples of conventional rotary transformer recording/reproduction switching circuits. 10... Stator, 11-14. 26-28... Groove, 15... Hole, 16.18... Recording winding, 17.
19... Regeneration winding, 20... Short ring, 2
1゜22...Leader line, 25.40...Rotor, 29
．． 31... Winding wire, 41.42... Spacer. Figure 1

Claims (1)

[Claims] n) As the winding for one channel of the stator, a recording winding and a reproducing winding are provided, each having a different turn ratio with respect to the winding of the opposing rotor, and the winding with the smaller number of turns is used as the winding for one channel of the stator. A rotary transformer characterized in that the recording winding having a larger number of turns is used as the reproducing winding. ■ The stator is provided with three concentric grooves, in which the first channel recording winding and reproducing winding, the short ring, and the second channel recording winding and reproducing winding are arranged in the groove from outside to inside. The windings for use are collected in this order, and four leader wire grooves are provided at equal intervals in the circumferential direction in succession to the three grooves, and holes are respectively provided in succession to the leader wire grooves. 2. The rotary transformer according to claim 1, wherein the recording winding and the reproducing winding have ends thereof extended to the outside through the eye hole. (2) The recording winding and the reproducing winding are arranged in parallel in the radial direction of the stator in one or more windings provided on the stator. rotary transformer. (4) The reproducing winding is provided in the single groove on the upper inner side of the stator in the radial direction with respect to the recording winding. 0-Talitrans.