JPS63249902A - Rotary head device - Google Patents

Abstract

PURPOSE:To obtain respective channel reproducing signal by increasing only the number of magnetic heads even without increasing that of the channels of a rotary transformer, by providing a rotary cylinder on which plural magnetic heads are placed, and a switch which connects the magnetic heads selectively. CONSTITUTION:The titled device is constituted of relay switches 2 and 3 which connect the reproducing signals of two magnetic heads to one of channel windings of the rotary transformer 1 selectively, and a coil 5 for generating magnetic flux placed on the upper plane of the rotary cylinder 1 and drives the relay switches 2 and 3, and it is constituted so that the reproducing signals from the two magnetic heads can be taken out by switching respectively from one of the channel windings by applying a voltage on or removing it from the coil 5. In such a way, it is possible to increase the number of the magnetic heads without increasing that of the channel windings of the rotary transformer, which functions effectively when the diameter of the rotary cylinder is made in a small size.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotary head device in a rotary head type magnetic recording/reproducing device, and is particularly characterized by a rotary transformer section that transmits and receives signals between a rotating section and a fixed section. It has the following.

Conventional technology In recent years, helical scan type magnetic recording and reproducing equipment (VTR)
) is becoming smaller, the outer diameter of the rotating cylinder is also becoming smaller. This means that the outer diameter of the cylinder unit is regulated, and the outer dimensions of the rotary transformer are also limited, and the number of winding channels cannot be increased. For this reason, it is not possible to have a head for special reproduction, and the number of heads is limited to the minimum necessary for recording and reproduction.

Problems to be Solved by the Invention However, as described above, if the number of heads is only that required for recording and reproduction, and the number of heads and the number of rotary transformer channels are the same, no head for special reproduction is provided. Furthermore, when the number of heads is increased, the number of channels of the rotary transformer must be increased by the same number as the number of heads, resulting in a complicated rotary transformer configuration, which causes problems such as interference caused by adjacent channels.

Means for Solving the Problems In order to solve the above problems, the rotary helad device of the present invention includes a relay switch that selectively connects the reproduction signals of the two magnetic heads to one channel winding of the rotary transformer. and a coil for generating a magnetic field that drives the relay switch, which is installed separately on the upper surface of the rotating cylinder. By applying or cutting off voltage to the coil, the reproduced signals from the two magnetic heads are generated. The configuration is such that each channel is switched and taken out from one channel winding.

Effect According to the above-described configuration, it is possible to obtain a reproduction signal for each head by increasing the number of heads while leaving the number of channels of the rotary transformer unchanged. Similarly, by switching the head signal, it becomes possible to obtain special reproduction signals, etc., without increasing the number of rotary transformer channels.

EXAMPLE Hereinafter, a rotary head device according to an example of the present invention will be described with reference to the drawings. FIG. 1 is a wiring diagram of a head and a rotary transformer of a rotary head device of the present invention, and FIG. 2 is a front view showing the configuration of a magnetic field generating device for switching a switch. In FIG. 1, 1 is a rotating cylinder to which a rotating head is fixed. Ll, R, are a first pair of heads with different azimuth angles, and are connected to the first channel winding T1 and the third channel winding T3 of the rotary transformer, respectively. R2, R2 is a second pair of heads, and R3, R3 is a third pair of heads. The head L2 of the second head pair and the head R3 of the third head pair are selectively connected to the second head pair via the changeover relay switch 2.
It is configured to be connected to the channel winding T2 of. Further, the head R2 of the second head pair and the head L3 of the third head pair are configured to be selectively connected to the fourth channel winding T4 via the changeover relay switch 3. The changeover relay switches 2 and 3 are fixed to the rotary cylinder 1, and are switched to terminals a and b, respectively, by applying a minute magnetic field.

In FIG. 2, numerals 4 and 5 are electromagnets 6 located apart from the rotating cylinder 1, 4 is an iron core, and 5 is a coil. 7 is an electromagnetic switch that opens and closes the magnetic field of the electromagnet 6, and 8 is its power source. 9 indicates a magnetic field generated by the electromagnet 6.

Next, this operation will be explained. When recording and reproducing in the normal standard mode, the first head shown in FIG.
R1 records and reproduces an audio signal, and sends the audio signal to the second head.2. Record and reproduce image signals using R2. At this time, the changeover relay switches 2 and 3 are respectively located on the terminal a side as shown in FIG. This is position a of relay switches 2 and 3 in FIG. Next, when recording or playing in long-time mode, the first
For the head of 1. R1 transmits the audio signal to the third head3. Video signals are recorded and played back by R3. At this time, the changeover relay switches 2 and 3 are respectively switched to the b terminal side. The movement will be explained with reference to FIG. When the electromagnetic switch 7 is turned on, a current is generated in the coil 5, and a magnetic field 9 is generated through the iron core 4 in the direction of the arrow in the figure. As a result, the changeover relay switches 2 and 3 are respectively switched to the b terminal side.

Effects of the Invention As described above, according to the present invention, the number of magnetic heads can be increased without increasing the channel winding of the rotary transformer, which is effective when the diameter of the rotating cylinder becomes small. It is.

[Brief explanation of drawings]

Fig. 1 is a wiring diagram showing the connection relationship between the magnetic head and the winding of a rotary transformer in an embodiment of the rotary head device of the present invention, and Fig. 2 is a wiring diagram showing the magnetic field generation for switch switching in the same embodiment. FIG. 3 is a front view of the device. 1... Rotating cylinder, 2... Changeover relay switch, 3... Changeover relay switch, 4
...Iron core, 5...Coil, 6...
...Electromagnet, 7...Electromagnetic switch, 8...
...power supply, 9...magnetic field.

Claims (1)

[Claims] a rotary cylinder on which a plurality of magnetic heads are mounted; a rotor-side winding of a plurality of channels of a rotary transformer fixed to the rotary cylinder; at least one winding of the rotor-side winding and the plurality of magnetic heads; A rotary head device comprising a relay switch for selectively connecting two predetermined magnetic heads among the heads, and a magnetic field generating coil disposed apart from the rotary cylinder and driving the relay switch. .