JPS63195803A - Rotary transformer device - Google Patents

Abstract

PURPOSE:To prevent an audio signal from being deteriorated due to the leakage of a video signal by forming an erasing winding groove between a video winding groove and an audio winding groove, and at the time of reproducing, short- circuiting the erasing winding on a fixed side transformer. CONSTITUTION:Winding grooves (a)-(g) are formed on a rotary transformer of a video tape recorder. Windings in the grooves (a)-(d) of a rotation side transformer 5 are connected to video heads V1-V4 and windings in the grooves (f), (g) are connected to audio heads A1, A2. In said state, parallel resonance circuits L1C1, L2C2 are respectively connected between the winding in the groove (d) and the head V4 and between the winding in the groove (f) and the head A1. The winding in the intermediate groove (e) between the video winding grooves and the audio winding grooves is connected to an erasing head E1, and at the time of reproducing, the erasing winding on the fixed side transformer 3 is short-circuited. Thus, the audio signal can be prevented from being deteriorated due to the leakage of the video signal.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary transformer device that can be used in a video tape recorder (hereinafter abbreviated as VTR).

BACKGROUND OF THE INVENTION FIG. 3 is a sectional view of a conventional rotary transformer device. 1 is a fixed member, 2 is a 7-channel fixed side transformer fixed to the fixed member 1, 3 is a fixed side terminal fixed to the fixed side transformer 2, 4 is a rotating member, and 5 is a fixed side transformer fixed to the rotating member 4. A seven-channel rotating side transformer is fixedly fixed and rotates coaxially with respect to the fixed side transformer 1, and 6 is a rotating side terminal fixed to the rotating side transformer 5.

The operation of the conventional rotary transformer device configured as described above will be described below. As shown in FIG. 4, in the winding grooves ad, the windings of the rotating side transformer are connected to the video heads v1 to v4 to transmit video signals. In the winding grooves e-f, the windings of the rotating side transformer are connected to the audio heads A1 to A2 to transmit audio signals. In the winding groove q, the winding of the rotating side transformer is connected to the erase head E1 to transmit an erase signal.

Problems to be Solved by the Invention However, with the above-mentioned configuration, when attempting to improve the image quality of a VTR, the brightness signal frequency in the video signal is increased, but as a side effect, this change is caused from the winding groove d to the winding groove e. This had the problem of signal leakage and deterioration of the S/N ratio of the audio signal.

In view of the above-mentioned problems, the present invention aims to improve the image quality of a VTR by reducing the S/N of the audio signal due to leakage of the video signal.
The present invention provides a rotating transformer device that prevents deterioration of the rotary transformer.

Means for Solving the Problems In order to solve the above-mentioned problems, the rotary transformer device of the present invention includes a video winding groove for transmitting a video signal, an audio winding groove for transmitting an audio signal, An erase winding groove for transmitting an erase signal, which is disposed between the audio winding groove and the audio winding groove, and a winding provided in the erase winding groove of the stationary transformer during playback are short-circuited. The structure is such that it is equipped with a short-circuiting means.

Operation The present invention is intended to prevent deterioration of the S/N ratio of an audio signal due to video signal leakage and to improve the image quality of a VTR by using the above-described configuration.

EXAMPLE Hereinafter, a rotary transformer device according to an example of the present invention will be described with reference to the drawings. Note that the fixed side transformer 2 and fixed side terminal 3 of the fixed member 1.7 channels to be used, and the rotating side transformer 5 and rotating side terminal 6 of the rotating member 4.7 channels are the same as those shown in Fig. 3, so Illustrations are omitted. FIG. 1 is a wiring diagram of a rotary transformer device according to a first embodiment of the present invention. Winding groove a
-d, the winding of the rotating side transformer 50 is connected to the video heads v1 to v4 to transmit video signals. In the winding groove e, the winding of the rotating side transformer 5 is connected to the erase head E1.
to transmit the erase signal.

In the winding grooves f and q, the winding of the rotating side transformer 5 is connected to the audio head A1. Connect to A2 to transmit audio signals. Furthermore, a parallel resonant circuit consisting of a coil L1 and a capacitor C1 is provided between the winding in the winding groove d of the rotating side transformer 5 and the video head, and the winding groove f
Coil L2 is placed between the winding applied to the
A parallel resonant circuit consisting of a capacitor C2 and a capacitor C2 is provided.

The operation of the rotary transformer device configured as described above will be explained below. Between the winding groove d for transmitting the video signal and the winding groove f for transmitting the audio signal, there is a winding groove e for transmitting the erase signal, and during playback, the winding groove for erasing of the fixed side transformer 3 is formed. Short-circuit the windings applied to e.

This can prevent the S/N ratio of the audio signal from deteriorating due to leakage of the video signal. Also, during recording, even if the erase signal jumps into the adjacent winding grooves d and f, the parallel resonant circuit consisting of coil L1 and capacitor C1, and coil L2 and capacitor C2 is set to resonate at the frequency of the erase signal, so there will be no problem. No problem.

A second embodiment of the present invention will be described below with reference to the drawings. Fixed members to be used: 1.7 channel fixed side transformer 2, fixed side terminal 3, rotating member 4.7
The rotary side transformer 5 and rotary side terminal 6 of the channel are the same as those shown in FIG. 3, so illustration thereof is omitted.

FIG. 2 is a wiring diagram of a rotary transformer device according to a second embodiment of the present invention. In the winding grooves ad, the windings of the rotating side transformer 6 are connected to the video heads 1 to v4 to transmit the left signal from the video heads 6 and 7'. In the winding groove e, the rotating side transformer 5
The winding is connected to the erase head E1 to transmit an erase signal. In the winding grooves f and q, the rotating side transformer 5
The windings are connected to the audio head A1~ to transmit audio signals. Furthermore, the video head v4 is connected to the winding wire provided in the winding groove d in the rotating side transformer 5.
A capacitor C3 is provided in parallel with the audio head A1, which is connected to the winding formed in the winding groove f, and a capacitor C4 is provided in parallel with the audio head A1.

The operation of the rotary transformer device configured as described above will be explained below. Between the winding groove d that transmits the video signal and the winding groove f that transmits the audio signal, there is a winding groove e that transmits the erase signal, and during playback, the erase winding groove e of the fixed side transformer 3 short-circuit the windings placed on the

This can prevent the S/N ratio of the audio signal from deteriorating due to leakage of the video signal.

Also, during recording, the erase signal is sent to the adjacent winding groove d.

Even if the frequency jumps to f, there is no problem because the inductance and capacitor C3 of the video head v4 and the inductance and capacitor C4 of the audio head A1 are set to a resonance frequency sufficiently lower than the frequency of the erase signal.

As described above, according to this embodiment, the erase winding groove is provided between the video winding groove and the audio winding groove, and the windings applied to the erase winding groove of the stationary transformer during playback are By short-circuiting, it is possible to prevent deterioration of the S/N of the audio signal due to leakage of the video signal, and to improve the image quality of the VTR.0 Effects of the Invention As described above, the present invention can improve the image quality of the VTR. The excellent effect of being able to achieve this goal can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a wiring diagram of a rotary transformer device according to a first embodiment of the present invention, FIG. 2 is a wiring diagram of a rotary transformer device according to a second embodiment of the present invention, and FIG. 3 is a diagram of a conventional rotary transformer device. The sectional view and FIG. 4 are wiring diagrams of a conventional rotary transformer device. C1-C4... Capacitor, Ll, A2...
...Koinope v1~■4...Video head,
A1. A2... Audio head, El ・
...Erase head. Name of agent: Patent attorney Toshio Nakao and 1 other person C1
, C2---Condenser, L2- Coil ■, ~'V4-BithiohetsF, 41.12---Ouiohead E1- Erase Hetsu Y No. 1111 1/I C3, C4--Connancer V+-Va- --Diohead A1. A2- Audio Head E, - Erase Head I Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A video winding groove for transmitting a video signal, an audio winding groove for transmitting an audio signal, and an eraser for transmitting an erase signal disposed between the video winding groove and the audio winding groove. 1. A rotary transformer device comprising: a winding groove for erasing and a short-circuiting means for short-circuiting a winding provided in an erase winding groove of a stationary transformer during reproduction.