JPH0452802Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to a magnetic recording/reproducing device in which a rotating cylinder is provided with an erasing head.

<Summary of the invention> The present invention provides an oscillation circuit for generating an erasing signal in a magnetic recording/reproducing device in which an erasing head is provided on a rotating cylinder and the erasing head erases a recorded track before the recording/reproducing head. By providing inside the rotary cylinder a switching circuit that receives an optical signal and controls an output signal of the oscillation circuit, crosstalk in the rotary transformer can be reduced.

<Prior Art> Currently, there is a magnetic recording/reproducing device in which an erasing head is provided on a rotating cylinder provided with a recording/reproducing head, and the erasing head erases a recorded track before the recording/reproducing head. . In this type of magnetic recording/reproducing device, a rotary transformer is used for signal coupling between each head and an external circuit, and the erase signal generated by the oscillation circuit also
This rotary transformer supplied the erase head from outside the cylinder.

<Problems to be solved by the invention> However, in the case of the above-mentioned conventional magnetic recording/reproducing device, it is necessary to provide a winding for the erase signal in addition to the winding for the recording/reproducing signal in the same rotary transformer. Due to the design, the spacing between each winding is narrow, and as a result, crosstalk occurs in which the erase signal leaks to other windings, especially when erasing, reproducing, and recording are performed simultaneously, such as during post-recording.

<Means for solving the problems> In order to solve the above-mentioned conventional problems, the present invention has the following features:
An oscillation circuit that creates an erase signal and a switching circuit that receives an optical signal and controls the output signal of the oscillation circuit are provided in a rotating cylinder.

<Operation> Therefore, according to the present invention, the erasing signal can be supplied to the erasing head within the same rotating cylinder, so there is no need to provide a winding for the erasing signal on the rotary transformer.

<Example> An example of the present invention will be described below with reference to the drawings.

In FIG. 1, 1 and 2 are recording/reproducing heads attached to a rotating cylinder (not shown), 3 is interposed between the rotating cylinder and a fixed cylinder, and corresponds to the recording/reproducing heads 1 and 2. A rotary transformer with two sets of windings, 4 and 5 are head amplifiers provided outside the cylinder, and the recording/reproducing heads 1 and 2 are signal-coupled with the head amplifiers 4 and 5, respectively, by the rotary transformer 3. ing.

Numeral 6 is an erasing head attached to a rotating cylinder like the recording/reproducing heads 1 and 2, 7 and 8 are both an oscillation circuit and a switching circuit provided in the rotating cylinder, and 9 is an eraser head provided at the end of the shaft. The erase signal generated by the oscillation circuit 7, which is a light receiving section, is supplied to the erase head 6 via a switching circuit 8 controlled by the optical signal.

Reference numeral 10 denotes a photoelectric conversion section that is provided at a predetermined position near the rotary cylinder and converts the erase operation control signal into an optical signal and outputs the optical signal.

It is assumed that the power supply voltage for driving the oscillation circuit 7 and the switching circuit 8 is supplied using a slip ring, a brush, or the like.

In the magnetic recording/reproducing device configured as described above, since the erasing signal is supplied to the erasing head 6 within the rotating cylinder, the erasing operation control signal is transmitted from the photoelectric conversion section 10 to the light receiving section 9 from the outside. An appropriate erasing operation can be performed by simply doing this.

<Effects of the invention> As described above, the magnetic recording/reproducing device of the invention has the following effects:
By providing an oscillation circuit that creates an erase signal and a switching circuit that receives an optical signal and controls the output signal of the oscillation circuit in a rotating cylinder,
The erasing signal can be supplied to the erasing head in a rotating cylinder. Therefore, since the rotary transformer is not provided with a winding for erasing signals, the erasing signal does not leak to the windings for recording and reproducing, and furthermore, the intervals between the windings for recording and reproducing can be widened. Therefore, crosstalk during recording and playback can also be reduced.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a magnetic recording/reproducing apparatus showing an embodiment of the present invention. 1, 2...recording/reproducing head, 3...rotary transformer, 4, 5...head amplifier, 6...erasing head, 7...oscillator circuit, 8...switching circuit, 9...light receiving section, 10... Photoelectric conversion section.

Claims (1)

[Scope of utility model registration request] In a magnetic recording/reproducing device in which a rotating cylinder is provided with an erasing head and the erasing head erases a recorded track before the recording/reproducing head, an erasing operation control signal is converted into an optical signal at a predetermined position near the rotating cylinder. It has a photoelectric conversion unit that converts and outputs the signal, and is further provided with an oscillation circuit that creates an erase signal in a rotating cylinder, and a switching circuit that receives the optical signal and controls the output signal of the oscillation circuit. A magnetic recording and reproducing device.