JPH0559603U - Magnetic recording / reproducing device - Google Patents

Abstract

(57) [Summary] [Purpose] In a system in which a recording head, a reproducing head, and a first-stage amplifier that amplifies a reproduction signal are arranged on the rotation side of a rotary transformer of a rotating cylinder, the first-stage amplifier is electrically fed during reproduction. [Structure] The rotary transformer 11 outputs the time-divided recording current.
The recording circuit 16 that supplies the recording head 7 on the rotating side
And a reproducing circuit 12 for amplifying a reproduced signal by connecting a first-stage amplifier 14 in the circuit of the reproducing head 8 on the rotary side of the rotary transformer 11, and connecting a power supply circuit 18 to the first-stage amplifier 14. At 18, the recording current at the time of recording is input and charged, and at the time of reproduction, the charged power source power is supplied to the first stage amplifier 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic recording / reproducing apparatus such as a digital audio tape recorder (hereinafter referred to as DAT), and more particularly to a power supply system for an amplifier in the case where an amplifier is provided in a circuit of a reproducing head.

[0002]

[Prior Art]

 Conventionally, a rotary cylinder of a rotary head type DAT is configured as shown in FIG. 3, for example. That is, the rotary cylinder 1 includes a motor 2, an upper drum 3 and a lower drum 4, and a shaft 5 of the motor 2 is supported by a bearing 6 and is connected to the upper drum 3 so that the motor 2 rotates at a predetermined rotation speed. Controlled. A recording head 7 and a reproducing head 8 are arranged at the lower end of the upper drum 3, and a tape 10 is obliquely wound around a fixed lower drum 4 along a lead 9 at a predetermined winding angle. By rotating the heads 7 and 8 at a high speed in the opposite direction with respect to the low speed running, the tracks on the tape 10 which are inclined obliquely are traced. During recording, a digitized recording signal, that is, recording currents in the positive and negative directions corresponding to 0 and 1 are time-divided and supplied to the recording head 7 on the rotating side by the rotary transformer 11, and the tape 10 is slanted. Recording is performed by magnetizing at high density along the track.

Further, in the reproducing circuit 12, as shown in FIG. 4, the cores 11a and 11b of the rotary transformer 11 are arranged to face each other with a minute gap between the upper drum 3 on the rotating side and the lower drum 4 on the stationary side. The reproducing head 8 is connected to the primary winding 11c of the core on the upper drum side of the rotary transformer 11, and is connected to the reproducing amplifier 13 and the like from the secondary winding 11d of the core 11b on the lower drum side. At the time of reproduction, on the contrary, the reproducing head 8 on the rotating side takes out a current corresponding to the change in the magnetic flux of the tape 10, outputs this reproducing current to the reproducing amplifier 13 on the fixed side by the rotary transformer 11, and outputs 0, 1 again. Convert to digital signal.

Therefore, in the reproducing circuit 12 described above, the first-stage amplifier 14 may be added in the circuit between the reproducing head 8 on the rotating side and the primary winding 11c. As a power supply system in this case, the shaft 5 of the rotating motor 2 is used, and the slip ring 15 is configured to come into contact with the shaft 5, and the slip ring 15 is connected to the first stage amplifier 14 on the rotating side via the shaft 5. A mechanism for supplying power has been proposed.

[0005]

[Problems to be solved by the device]

 By the way, in the above-mentioned prior art, since the mechanical mechanism of the slip ring 15 is used for the rotary cylinder 1, the structure becomes complicated. Further, since the slip ring 15 is provided on the outside of the rotary cylinder 1, it is not preferable in terms of downsizing, mounting, noise, and the like.

The present invention has been made in view of this point, and in a system in which a recording head, a reproducing head, and a first-stage amplifier for amplifying a reproduction signal are arranged on the rotation side of a rotary transformer of a rotary cylinder, the first-stage amplifier is used at the time of reproduction. The purpose is to electrically feed to.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention connects a recording circuit that supplies a time-divided recording current to a recording head on the rotating side by a rotary transformer and a first-stage amplifier in the circuit of the reproducing head on the rotating side of the rotary transformer. In a magnetic recording / reproducing apparatus having a reproducing circuit for amplifying a reproduced signal, a power supply circuit is connected to the first-stage amplifier, the recording current at the time of recording is inputted and charged by this power supply circuit, and the charged power supply at the time of reproduction is supplied. It is supplied to the first stage amplifier.

[0008]

[Action]

 Based on the above configuration, both the recording circuit and the reproduction circuit are charged to the power supply circuit by using the recording current at each recording side on the rotation side of the rotary transformer, and at the time of reproduction, the power supply power of the power supply circuit is the first stage of the reproduction circuit. The reproduction signal is amplified by being electrically supplied to the amplifier.

[0009]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the circuits of the DAT recording head and the reproducing head will be described. First, between the upper drum 3 on the rotating side of the rotary cylinder 1 and the lower drum 4 on the fixed side, the cores 11a and 11b of the rotary transformer 11 are arranged to face each other with a minute gap. Therefore, in the recording circuit 16, the recording head 7 is connected to the primary winding 11e of the core 11a on the upper drum side of the rotary transformer 11, and the recording amplifier 17 is connected to the secondary winding 11f of the core 11b on the lower drum side. Configured. At the time of recording, the recording signal digitized from the recording amplifier 17, that is, the recording currents Ir in the positive and negative directions corresponding to 0 and 1 are time-divided and input to the rotary transformer 11, and the secondary winding 11f, It is supplied to the recording head 7 on the rotating side by a magnetic circuit composed of the cores 11a and 11b and the primary winding 11e, and the tape 10 is magnetized along an oblique track for recording.

The reproduction circuit 12 is also the same. The reproducing head 8 is connected to the primary winding 11c of the core 11a on the upper drum side of the rotary transformer 11, and is connected to the reproducing amplifier 13 from the secondary winding 11d of the core 11b on the lower drum side. Further, the first stage amplifier 14 for amplifying the reproduction signal is connected in the circuit of the reproduction head 8 of the rotating upper drum 3 and the primary winding 11c.

Here, either one of the recording circuit 16 and the reproducing circuit 12 is selectively used, and at the time of recording, the time-divided recording current Ir is supplied to the rotating recording head 7 of the upper drum 3. Therefore, by using the recording current Ir of the same upper drum 3 for the first-stage amplifier 14 arranged in the rotating upper drum 3, it becomes possible to electrically supply power easily. From this, the power supply circuit 18 for rectifying, smoothing, and charging is connected to the first-stage amplifier 14, and the primary winding 11e on the rotating side of the recording circuit 16 is connected to the power supply circuit 18.

Next, the operation of this embodiment will be described. First, at the time of recording, a time-divided recording current Ir as shown in FIG. 2A corresponding to digital signals of 0 and 1 from the recording amplifier 17 is input to the recording head 7 via the rotary transformer 11 and is supplied to the tape 10. The recording current Ir is partially extracted and input to the power supply circuit 18. Then, in the power supply circuit 18, the recording current Ir is rectified and smoothed as shown in FIG.

After that, when the reproducing head 8 traces the recording track of the tape 10 during reproduction, the reproducing current Ip corresponding to the magnetization pattern is taken out by the reproducing head 8. At this time, the power supply power stored in the power supply circuit 18 is supplied to the first-stage amplifier 14, whereby the reproduction current Ip of the reproduction head 8 is amplified. Then, the amplified reproduction current Ip is output to the reproduction amplifier 13 on the fixed side by the magnetic circuit of the primary winding 11c of the rotary transformer 11, the cores 11a and 11b, and the secondary winding 11d, and is converted into a digital signal again. To be done. On the other hand, the electric power of the power supply circuit 18 is discharged at the time of this reproduction, but is recharged at the time of the next recording, and thus charging and discharging are repeated every time recording and reproduction are performed.

Although the DAT has been described above as the embodiment of the present invention, the present invention can be applied not only to this but also to a similar magnetic recording / reproducing apparatus.

[0015]

[Effect of the device]

 As described above, according to the present invention, in the magnetic recording / reproducing apparatus such as DAT, when the reproducing circuit on the rotating side of the rotating cylinder is provided with the first stage amplifier, the same recording current on the rotating side is used for the first stage amplifier. Since the power is supplied electrically, the configuration is simple and the reliability is improved. Since the time-divided recording current is used, the power supply circuit can generate a sufficient power supply voltage.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of a magnetic recording / reproducing apparatus according to the present invention.

FIG. 2 is a diagram showing a recording current and its rectified current.

FIG. 3 is a diagram showing a conventional power supply mechanism using a rotating cylinder.

FIG. 4 is a diagram showing a conventional reproducing circuit.

[Explanation of symbols]

 7 recording head 8 reproducing head 11 rotary transformer 12 reproducing circuit 14 first stage amplifier 16 recording circuit 18 power supply circuit

Claims (2)

[Scope of utility model registration request] 1. A recording circuit for supplying a time-divided recording current in a plus direction and a minus direction to a recording head on a rotating side by a rotary transformer, and a first-stage amplifier connected to a circuit of a reproducing head on the rotating side of the rotary transformer. In a magnetic recording / reproducing device having a reproducing circuit for amplifying a reproduced signal,
A magnetic recording / reproducing apparatus characterized in that a power supply circuit is connected to the first-stage amplifier, the recording current at the time of recording is inputted and charged by the power supply circuit, and the charged power source power is supplied to the first-stage amplifier during reproduction. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the power supply circuit of the first-stage amplifier is connected to a rotating winding side of a rotary transformer in the recording circuit.