JPH03165302A - Cylinder device of magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce the size of the magnetic recording device by using one rotary transformer in common for one magnetic head and the other head. CONSTITUTION:Rotary transformers an be decreased while the compatibility with an existent cylinder is maintained by synchronizing a VTR signal with magnetic heads so that a signal of one starting field is written when a 2nd magnetic tape 2 is brought into contact with a magnetic tape and a signal of next one field is written when the 2nd magnetic head 2 is brought into contact with the magnetic head. For reproduction, the VTR signal is transmitted to amplifiers 11 and 12 by tracing back said process. Further, one amplifier 13 is connected to said fixed-side rotary transformer 10 to obtain the same operation and the device is reduced in size and made inexpensive.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for transmitting signals to a magnetic head for recording signals on a magnetic tape used in a magnetic recording/reproducing device, and signals from the magnetic head for reproducing signals. This invention relates to a cylinder device for a magnetic recording/reproducing device in which the number of rotary transformers for transmission is reduced.

[Conventional technology]

In recent years, the number of heads of VTRs has increased as improvements in image quality and development of special playback capabilities have progressed. FIG. 3 shows a circuit diagram of a conventional cylinder device of this type of magnetic recording/reproducing apparatus. In the figure, 1 is a first magnetic head, 2 is a second magnetic head attached at a position of 180 degrees from the first magnetic head 1, and 3 is connected to the first magnetic head 1. A first rotary transformer 4 on the rotating side, a second rotary transformer 4 on the rotating side connected to the second magnetic head 2;
5 is a fixed-side first rotary transformer that is paired with the rotating first rotary transformer 3; 6 is a fixed-side rotary transformer that is paired with the rotating second rotary transformer 4; second rotary transformer, 7
8 is a first amplifier connected to the first rotary transformer 5 on the fixed side, and 8 is a second amplifier connected to the second rotary transformer 6 on the fixed side.

Here, the case where VTR signals are recorded on magnetic tape will be explained. First, the signal sent to the first amplifier 7 is sent to the first rotary transformer 5 on the fixed side, and from this first rotary transformer 5 on the fixed side to the first rotary transformer 3 on the rotating side. Then, the first
is sent from the rotary transformer 3 to the first magnetic head 1, and the VT is applied to the magnetic tape in contact with the first magnetic head l.
The R signal will be written.

Similarly, the signal sent to the second amplifier 8 is sent to the second rotary transformer 6 on the fixed side.
from the rotary transformer 6 to the second rotary transformer 4 on the rotating side. Then, it is sent from the second rotary transformer 4 on the rotating side to the second magnetic head 2, and is sent to the second magnetic head 2.
A VTR signal is written on the magnetic tape that is in contact with the magnetic head 2.

Here, the signals sent to the first amplifier 7 and the second amplifier 8 are: first, one field of the VTR signal (1760 signal of the TV signal) is sent to the first amplifier 7; Then, the signal for the next one field is sent to the second amplifier. In this way, signals for one field are alternately sent in sequence and written on the magnetic tape by the respective magnetic heads 1 and 2.

Further, in the case of reproduction, the VTR signal is transmitted to each amplifier by following the reverse process to the above.

[Problem to be solved by the invention]

In the conventional cylinder device configured as described above, a rotary transformer on the rotating side and a rotary transformer on the stationary side are required for one magnetic head. Therefore, as the number of magnetic heads increases, the number of rotary transformers on the rotating side and the fixed side increases, resulting in an increase in the weight of the cylinder device and a problem in that it requires a large space.

The present invention was made to solve the above-mentioned problems, and an object of the present invention is to obtain a cylinder device for a magnetic recording/reproducing device that can reduce the number of rotary transformers by half.

(Means for Solving the Problems) A cylinder device for a magnetic recording and reproducing device according to the present invention includes:
It has at least 11 or more magnetic heads arranged in pairs,
A cylinder device for a magnetic recording and reproducing device comprising a rotating upper cylinder and a fixed lower cylinder, and configured to transmit a signal from the magnetic head or a signal to the magnetic head using a rotary transformer, the cylinder device comprising: a rotating upper cylinder and a fixed lower cylinder; The present invention is characterized in that a single rotary transformer is used for both the magnetic head and the other magnetic head.

[For production]

In this invention, one rotary transformer is required for one magnetic head, but since two rotary transformers are made the same for each magnetic head, one rotary transformer is sufficient.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows a circuit diagram of a magnetic recording and reproducing device according to the present invention,
In the figure, 1 is a first magnetic head, 2 is a second magnetic head, 9 is a rotating side rotary transformer commonly connected to the first and second magnetic heads 1.2, and 10 is a rotary transformer on the rotating side. A rotary transformer 11 on the fixed side paired with this rotary transformer 9 is a VT of the first magnetic head 1.
a first amplifier for amplifying the R signal; 12 is the second amplifier;
This is a second amplifier for amplifying the VTR signal of the magnetic head 2.

Next, the case of recording a VTR signal on a magnetic tape will be explained. First, the VTR sent to the first amplifier 11
The signal is sent to the rotary transformer 10 on the fixed side. It is sent from the rotary transformer 10 on the fixed side to the rotary transformer 9 on the rotating side, and from the rotary transformer 9 on the rotating side to the first magnetic field 1 and the second magnetic head 2. A VTR signal is written on the magnetic tape that is in contact with the second magnetic head 2.

Here, since the first magnetic head 1 and the second magnetic head 2 are connected to the rotary transformer 9 on the rotating side, the first magnetic head 1 and the second magnetic head 2 are connected to the same VTR.
A signal will be sent.

However, the first magnetic head l and the second magnetic head 2 are
The magnetic tape is placed at an 80 degree position, and the magnetic tape is attached to the cylinder device at an angle of 18 degrees.
Since the magnetic head 1 is wound only by 0 degrees + α, when the first magnetic head 1 is in contact with the magnetic tape, the second magnetic head 2 is located in a place not in contact with the magnetic tape. Therefore, when the first magnetic head 1 is recording, the second magnetic head 2 is not recording.

Similarly, the VTR signal sent to the second amplifier 12 is transmitted to the first magnetic head 1 and the second magnetic head 2 as described above.
However, when the second magnetic head 2 is in contact with the magnetic tape, as when recording with the first magnetic head 1, the first magnetic head 1 It is located in a place that is not in contact with the magnetic tape.

However, for +α, the same VTR signal is transmitted to the first magnetic head 1.
and the second magnetic head 2 write on the magnetic tape at the same time. However, the VTR signal written by the first magnetic head 1 and the VTR signal written by the second magnetic head 2 are originally continuous, and there is no problem even if they are written simultaneously.

Further, the +α signal is a portion that does not actually appear on the television.

In this way, when the first magnetic head 1 is in contact with the magnetic tape, the signal for the first one field is written, and then the second magnetic head 2 is written onto the magnetic tape. By synchronizing the magnetic head and the VTR signal so that when they are in contact, the signal for the next field is written, the rotary transformer can be left in place while maintaining compatibility with the current cylinder device.

In addition, in the case of reproduction, the VTR signal is transmitted to the amplifiers 11 and 12 through the reverse process described above.

There is no problem where the first magnetic head 1 and the second magnetic head 2 for +α are in contact with the magnetic tape at the same time for the above-mentioned reason.

Further, in the above embodiment, the case of a VTR signal was explained, but the same effect of +S as described above can be obtained also for an audio signal.

Further, in this invention, the case has been described in which the first and second amplifiers 11 and 12 are connected to the rotary transformer 10 on the fixed side, but in addition, as shown in FIG. Even by connecting the amplifier 13, the same effect as described above can be obtained, and the device can be made smaller and cheaper.

【Effect of the invention〕

As explained above, according to the present invention, since the rotary transformer of each set of two magnetic heads is shared by one rotary transformer, it is possible to downsize the magnetic recording/reproducing device, and the device can be provided at a low cost. There is.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram of a cylinder device of a magnetic recording/reproducing device according to one embodiment of the present invention, FIG. 2 is a circuit diagram of another embodiment of the device of this invention, and FIG. 3 is a circuit diagram of a conventional cylinder device. be. DESCRIPTION OF SYMBOLS 1... First magnetic head, 2... Second magnetic head, 9... Rotating side rotary transformer, 10... Fixed side rotary transformer, 11... First amplifier,
...Second amplifier, ...Amplifier. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] It has at least one set of two magnetic heads,
A cylinder device for a magnetic recording and reproducing device comprising a rotating upper cylinder and a fixed lower cylinder, and configured to transmit a signal from the magnetic head or a signal to the magnetic head using a rotary transformer, the cylinder device comprising: a rotating upper cylinder and a fixed lower cylinder; 1. A cylinder device for a magnetic recording/reproducing device, characterized in that a rotary transformer is shared between one magnetic head and the other magnetic head.