JPS61243902A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To make a cylinder unit light in weight, small in size, and also low in its cost by constituting it so that a signal is sent and received to and from a rotary head through a rotary transformer in wich the number of poles is one. CONSTITUTION:When recording a signal onto a magnetic tape, the signal to be recorded is transferred to a rotor 24 form a stator 25 of a rotary transformer, and inputted to two rotary heads 2, 3 which is connected electrically in series or in parallel to this rotor 24. The electric signal which is transferred to the rotary heads 2, 3 is converted to a magnetic signal by an electromagnetic conversion, and recorded in the magnetic tape through the rotary heads 2, 3. In this case, the magnetic tape is wound to a cylinder unit at a winding angle of <180 deg., therefore, in any instant, the magnetic tape contacts to only one rotary head, and a signal is sent and received to and from only one rotary head which is contacting at that time onto the magnetic tape. Accordingly, even if the number of poles of the rotary transformer is one, recording and reproduction are executed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic recording/reproducing device, and more specifically, to a magnetic recording/reproducing device, which transmits/receives a signal to a rotating head via a rotary transformer, thereby producing a magnetic recording device that is wound around a cylinder unit at an angle. The present invention relates to a helical scan type magnetic recording and reproducing device that performs recording and reproducing on a magnetic tape.

[Summary of the Disclosure] This specification and drawings describe a helical scan type magnetic recording/reproducing device in which a cylinder unit is miniaturized by transmitting and receiving signals to and from a rotating head via a rotary transformer having one pole. , which discloses a technology for reducing weight.

[Prior Art] The conventional structure of such a magnetic recording device is shown in FIGS. 3 and 4, in which the reference numeral 1 is a rotating cylinder, and this rotating cylinder l is a shirt. 1
It can be attached to 1.

This shaft 11 is rotated relative to the fixed cylinder 7 via bearings 12,13 by a motor consisting of a stator 8 and a rotor 9. A transformer stand 6 is attached to the rotating cylinder 1, and a rotor 4 of a rotary transformer is attached to the transformer stand 6, and a stator 5 of a rotary transformer is attached to the fixed cylinder 7 at a position facing the rotor 4. installed. The rotor 4 or stator 5 is constructed by winding wires 15 and 16 around concentric circumferential grooves provided in a core 14, as shown in FIG. 2, and the inner winding 16 is connected to the rotating head 3.

In such a configuration, a magnetic tape (not shown) is wound around the cylinder unit at an angle of 180° or more and is run. The signal to be recorded here enters the stator 5 of the rotary transformer, is transmitted to the rotary transformer 4 and is input to the two rotary heads 2.3 connected to this rotor.

The electrical signals transmitted to the two rotating heads 2, 3 are converted into magnetic signals by electromagnetic conversion, and the electrical signals are transferred to the two rotating heads 2, 3.
recorded on the magnetic tape contact surface of No. 3.

[Problems to be Solved by the Invention] In such a conventional helical scan type magnetic recording/reproducing device, a magnetic tape is rotated 180° by a cylinder unit provided with two or more rotating heads.
Since signals are recorded and reproduced by winding the rotary transformer, the number of poles of the rotary transformer must be at least two, which makes it difficult to reduce the weight, size, and cost of the cylinder unit.

[Means for Solving the Problem] In order to solve this problem, the present invention adopts a configuration in which signals are sent to and received from the rotary head via a rotary transformer having one pole.

[Function] In the present invention, the number of poles of the rotary transformer is set to one, and each rotary head is connected to this pole to perform recording and reproduction on a magnetic tape, and the number of poles of the rotary transformer is set to one.
This makes it possible to reduce the weight, size, and cost of the cylinder unit.

[Example] Hereinafter, the present invention will be described in detail according to an example shown in the drawings.

1 and 2 illustrate an embodiment of a magnetic recording/reproducing apparatus according to the present invention, in which the same parts as in FIG. 3 are denoted by the same reference numerals and the explanation thereof will be omitted.

In the present invention, the rotor 24 of the rotary transformer attached to the rotating cylinder side and the stator 25 of the rotary transformer attached to the stationary cylinder 7 side are each configured to have one pole. That is, each rotor 24 and stator 25 are constructed by winding a winding 26 around a circumferential groove provided in the core 14, as shown in FIG. The windings 26 on the rotor 24 side are each connected to a rotary head 2.3. Further, in the present invention, the magnetic tape (not shown) is inclined at a predetermined angle, and windings of less than 1800 degrees are wound around the cylinder unit at the corners.

When recording a signal on a magnetic tape in such a configuration, the signal to be recorded is transmitted from the stator 25 of the rotary transformer to the rotor 24, and the two rotary heads 2 electrically connected to the rotor 4 in series or in parallel. .3
The electric signal transmitted to the zero-rotation head 2.3 is converted into a magnetic signal by electromagnetic conversion, and the electric signal is transmitted to the rotation head 2.3.
recorded on magnetic tape via

Here, since the magnetic tape is wrapped around the cylinder unit at a corner with less than 1800 turns, the magnetic head is in contact with only one rotating head at any moment, and the magnetic tape is Since signals are sent and received from only one rotary head in contact with the rotary transformer, signals can be recorded and reproduced without problems even if the number of poles of the rotary transformer is one.

[Effects of the Invention] As explained above, according to the present invention, the number of poles of the rotary transformer is reduced to one, so the size and cost of the rotary transformer can be reduced, and the magnetic recording/reproducing device can be made lighter and more compact. This makes it possible to achieve greater efficiency and lower prices.

[Brief explanation of the drawing]

1 and 2 show embodiments of the present invention.
The figure is a sectional view showing the configuration of the magnetic recording/reproducing device, Figure 2 is a plan view showing the configuration of the rotary transformer, Figures 3 and 4 are
The figures show a conventional example; FIG. 3 is a sectional view showing the configuration of the conventional device, and FIG. 4 is a plan view showing the configuration of a rotary transformer. 1... Rotating cylinder 2.3... Rotating head 7.
・・Fixed cylinder 8・・Motor stator 9・・
・Rotor 24 of the motor...Rotor 25 of the rotary transformer...Stator of the rotary transformer Fig. 1 Fig. 2

Claims (1)

[Scope of Claims] 1) In a magnetic recording and reproducing device that performs recording and reproduction on a magnetic tape that is wound obliquely around a cylinder unit by transmitting and receiving signals to and from a rotary head via a rotary transformer, the number of poles of the rotary transformer is into one,
A magnetic recording/reproducing device characterized in that each rotary head is connected to this one pole. 2) The magnetic recording and reproducing apparatus according to claim 1, wherein the magnetic tape is wound around a cylinder unit at an angle of less than 180 degrees.