JPS6055884B2 - Rotating magnetic head - Google Patents

Description

[Detailed description of the invention] The present invention relates to a rotary magnetic head.

In recent years, storage devices such as large-capacity storage devices that record and reproduce information signals using rotating magnetic heads have been put into practical use. In such a storage device, signals can be exchanged between the rotating magnetic head and the external recording/reproducing circuit using two methods: one in which the rotor and stator come into sliding contact, and the other in which a non-contact rotating transformer is used. The former is not preferable because it tends to generate sliding noise and lowers the S/N ratio. Therefore, the latter type of rotary transformer is preferably used. However, as such storage devices continue to develop, there will be a growing demand for higher information processing speeds, and it is expected that they will be adopted as multi-element magnetic heads as rotary heads. In this case, the rotary transformer will also need to be made into a multichannel transformer, but it is conceivable to simply arrange a large number of single-channel rotary transformers coaxially with respect to the rotation axis. In this case, the mounting structure becomes complicated and it is difficult to realize a compact structure, so the number of channels is limited to 2 to 4.

Accordingly, the present invention provides a rotary magnetic head having a multi-channel rotary transformer, which has a compact mounting structure and is easy to implement even when the number of elements is increased compared to 2 to 4 channels. The rotating magnetic head of the present invention will be explained using FIG. 1 as an example.

The example shown in this figure shows an N-channel magnetic head in which the same head serves as both a recording head and a reproducing head. First #1
Assume that information signal 1 is guided to channels .about.#N. A specific channel of this signal is selected in the channel selection matrix 4 by a matrix combination of the X selection signal 2 and the Y selection signal 3. The selected signal is transmitted to the rotary magnetic head via the signal rotary transformer 7. At this time, X and Y selection signals are also transmitted to the rotating magnetic head section by the X selection rotary transformer 8 and the Y selection rotary transformer 9. The method of this transmission is
For example, if the contents of Y are n bits each, then f,
, f. ...It is also possible to transmit the signal by modulating the frequency fN with the X and Y modulation circuits 5 and 6, or by transmitting the signal using a single frequency F.
By changing the amplitude, the amplitude a. ,2ao,...na
It is also possible to use a method of transmitting amplitude changes such as . In this way, the selection signal passing through the rotary transformers 8 and 9 is transmitted to the X demodulation circuit 1O.
, Y demodulation circuit 11 restores the original X, Y selection signals, and guides them to the channel selection matrix 12 to select a specific magnetic head 13. This channel selection matrix may have a circuit configuration known in the art for magnetic drum storage devices and magnetic disk storage devices. Further, when the number of channels of the magnetic head is not very large, instead of using an X, Y matrix configuration, a method may be adopted in which the selection gate is opened and closed by an n-bit selection code using only an x selection signal. The DC power supplied to the demodulation circuit and selection matrix portion of such a rotating magnetic head is supplied by converting an AC signal supplied from an AC power supply 14 via a power supply rotary transformer 15 into a DC signal by a rectifier circuit 16. By scanning all channels in an X, Y matrix in this manner, recording signals can be guided to the magnetic heads of all corresponding channels. At this time, it is also possible to provide a recording/reproducing amplifier between the channel selection matrix 12 and the magnetic head 13. During playback, the X, Y selection signals 2 and 3 are applied in the same way as during recording, and the playback signal of the channel selected via the channel selection matrix 12 is transmitted to the channel selection matrix 4 via the signal rotary transformer 7. Information on a specific channel can be extracted from the specified number of channels X and Y. As described above, according to the method of the invention, by using one rotary transformer for signals, a rotary transformer for selecting X, Y or one of them, and a rotary transformer for power supply, an arbitrary multi-channel recording/reproducing magnetic head can be created. This makes it possible to increase the recording density of information.

Also, unlike the example in Figure 1, if magnetic heads for recording and reproduction are provided separately for each channel, two rotary transformers for recording and reproduction and two signals are used, similar to the example in Figure 1. With this configuration, an arbitrary multi-channel magnetic head can be realized. Further, the various circuit sections mounted on the rotating magnetic head section can be extremely compactly mounted by applying recent developments in multi-element integration technology such as LSI, making it possible to realize a compact magnetic head.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the rotary magnetic head of the present invention. 4...Channel selection matrix, 5...X modulation circuit, 6...Y modulation circuit, 7...Rotary transformer for signal, 8...Rotary transformer for X selection, 9...For Y selection Rotating transformer, 10...X demodulation circuit, 11...Y demodulation circuit, 12... Channel selection matrix, 13
. . . magnetic head, 14 . . . AC power supply, 15 . . . rotating transformer for power supply, 16 .

Claims (1)

[Claims] 1. In a multi-channel rotary magnetic head, a rotary transformer for transmitting and receiving signals, a rotary transformer for power supply, and a rotary transformer for channel selection signals are provided,
A rotary magnetic head characterized in that a rotary magnetic head section is equipped with a channel selection matrix that selects a magnetic head of an arbitrary channel for recording/reproduction according to a channel selection signal.