JPS63164003A - Rotary head type signal recording and reproducing device - Google Patents

Abstract

PURPOSE:To record a broad band recording signal by a magnetic head while minimizing the deterioration in said signal by connecting a resistor converting a recording signal into a current between one end of a main body of a rotary transformer and a ground point. CONSTITUTION:The resistor 3 applying voltage-current conversion to a recording signal is connected between a ground point and the other terminal of the main body of a rotary transformer 2 sending the recording signal from the main body to the rotary cylinder. Thus, stray capacitance from a recording amplifier 4 to the rotary transformer 2 and the stray capacitance provided at the main body of the rotary transformer 2 mainly are almost neglected. Thus, the broad band recording signal, e.g., a digitized video signal is sent via a rotary transformer 2 on a rotary cylinder from the main body while minimizing the deterioration in the signal and recorded on a recording medium by a magnetic head.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary head type signal recording and reproducing device for recording and reproducing broadband signals, such as digitized video signals.

In a conventional rotary head type signal recording and reproducing device, signal transmission between the rotary cylinder on which the head is mounted and the main body is performed via a rotary transformer.

Figure 2 shows a recording system circuit that transmits a single frequency modulated video signal from the main body via a rotary transformer to a magnetic head mounted on a rotating cylinder in a conventional rotary head type signal recording and reproducing device that performs magnetic recording and reproducing. This shows a system diagram.

5 is a magnetic head, 6 is a rotary transformer, 7 is a resistor, and 8 is a recording amplifier. The operation of the conventional example will be explained below.

A frequency modulated video signal, which is a recording signal, is sent to a recording amplifier 8.
is input to. The recording signal output from the recording amplifier 8, which has a relatively low output impedance, is converted into voltage and current by the resistor 7, and sent to the magnetic head 5 via the capacitor and the rotary transformer 6 for recording with the necessary current and band. Transmitted as a signal. The resistance value of the resistor 7 is set to a relatively large value such that the impedance from the output stage of the recording/printer 8 to the magnetic head is hardly affected by an increase in the impedance component in the high frequency region of the magnetic head 5 within the required band. It's worth it.

Problems to be Solved by the Invention However, in the configuration shown in FIG. 2, a signal having a wider band than a video signal after conventional analog signal processing, such as a digitized video signal, is transmitted through a rotary transformer. During transmission, the signal transmitted from the output stage of resistor A to the magnetic head via resistor 7 of the rotary transformer, which has a relatively large resistance value, becomes high due to the stray capacitance of the transmission path including the rotary transformer. The problem was that there was significant deterioration in the area.

In view of the above, the present invention provides a rotary head type signal recording and reproducing device that transmits wideband signals from the output stage of a recording amplifier while minimizing signal deterioration in high frequencies due to stray capacitance of a transmission path including a rotary transformer. An object of the present invention is to provide a rotary head type magnetic recording/reproducing device that can record information using a magnetic head.

Means for Solving the Problems The present invention provides a magnetic head for recording, a rotary transformer for transmitting a recording signal from the main body side to a rotating cylinder, and a rotary transformer for transmitting the recording signal connected to one end of the rotary transformer on the main body side. A rotary head type signal recording and reproducing device comprising: a low output impedance recording amplifier for amplification; and a resistor for converting a recording signal from voltage to current, connected between the other end of the main body side of the rotary transformer and a ground point. It is.

Effect of the Invention According to the present invention, the signal output from the recording amplifier having a low output impedance is transmitted to one end of the rotary transformer, and voltage-to-current conversion is performed by the resistor connected to the other end of the rotary transformer. Stray capacitance from the recording amplifier to the rotary transformer and stray capacitance mainly on the main body side of the rotary transformer can be almost ignored. Therefore, it is possible to transmit a voltage-current converted recording signal that greatly suppresses signal deterioration in high frequencies through a rotary transformer, and then transmit it to the magnetic head as a recording signal having the required band and current value. .

Embodiment FIG. 1 shows a circuit diagram of a recording system of a rotary head type magnetic recording/reproducing apparatus according to an embodiment of the present invention.

In FIG. 1, 1 is a magnetic head, 2 is a rotary transformer, 3 is a resistor, and 4 is a low output impedance recording amplifier. The operation in this embodiment will be explained below.

A broadband recording signal is input to a recording amplifier 4.

Next, the recording signal output from the recording amplifier 4, which has a low output impedance, is transmitted to one end of the rotary transformer 2 on the main body side via a capacitor. Here, the recording signal is voltage-current exchanged by a resistor 3 connected via a capacitor between the other end of the rotary transformer 2 on the main body side and a ground point. The voltage-current converted recording signal is transmitted from the main body side to the rotating cylinder via the rotary transformer 2, and is transmitted to the magnetic heald 1 as a signal having the necessary current and necessary band.

Note that the resistance value of the resistor 3 is the same as that of the recording amplifier 4 as in the conventional example.
The impedance from the output stage of the magnetic head 1 to the magnetic head 1 is set to a relatively large value so that it is hardly affected by an increase in the impedance component of the magnetic head 1 at high frequencies within the required band.

As described above, according to this embodiment, the output terminal of the recording amplifier, which has a low output impedance, is connected to one end on the main body side of the rotary transformer via a capacitor, and the other end on the main body side of the rotary transformer is connected to the ground point. By connecting a resistor through a capacitor in between, the following effects can be obtained.

The signal output from the recording amplifier, which has a low output impedance, is transmitted to one end of the rotary transformer, and is converted from voltage to current by a resistor connected to the other end of the rotary transformer, so the stray capacitance from the recording amplifier to the rotary transformer is reduced. Also, the relatively large stray capacitance mainly on the main body side of the rotary transformer can be almost ignored. However, signal deterioration in the high range is greatly suppressed.
The current-converted recording signal can be transmitted via a rotary transformer, and can be transmitted to the magnetic head as a recording signal having the required band and current value.

According to the present invention, in a rotary head type signal recording and reproducing device, a wideband recording signal, such as a digitized video signal, is transferred from the main body to a magnetic head on a rotating cylinder via a rotary transformer to prevent signal deterioration. It is possible to minimize the amount of information transmitted and record it on a recording medium using a magnetic head, which has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the main parts of the recording system of a rotary head type signal recording and reproducing apparatus according to an embodiment of the present invention, and FIG. 2 shows the main parts of the recording system of a conventional rotary head type signal recording and reproducing apparatus. FIG. 1... Magnetic head, 2... Rotary transformer, 3... Resistor, 4... Recording amplifier. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] A magnetic head that performs recording, a rotary transformer that transmits a recording signal from the main body side to the rotating cylinder, a low output impedance recording amplifier that amplifies the recording signal connected to one end of the rotary transformer on the main body side, and the rotary transformer. 1. A rotary head type signal recording/reproducing device, comprising: a resistor connected between the other end of the main body side and a ground point for converting a recording signal from voltage to current.