JP2510149Y2 - Magnetic playback device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION A Field of Industrial Application The present invention relates to a magnetic reproducing apparatus, and can be applied to a magnetic reproducing apparatus such as a digital audio tape recorder and a video tape recorder.

B Outline of the Invention The present invention is designed to insert an external noise signal and a magnetic head by directly inserting a jack part provided on the reproduction signal processing circuit side shielded by a shield case into a connector part protruding from a magnetic head device. The reproduced signal can be processed without being adversely affected by the device.

C Conventional technology Conventionally, in a magnetic reproducing apparatus such as a digital audio tape recorder, when processing a weak reproduction signal, SN
The device is designed so that the ratio does not deteriorate.

For example, as shown in FIG. 4, in a magnetic head device, a reproduction signal obtained from a magnetic head provided on a rotating drum 2 which rotates with a magnetic tape 1 wound is reproduced via a shield wire 4 and a connector 6. The signal is output to the signal processing unit 3, and the reproduction signal processing unit 3 amplifies the reproduction signal by the built-in reproduction signal processing circuit to correct the frequency characteristic, and then outputs the signal to the signal processing unit in the subsequent stage.

In the configuration of FIG. 4, the reproduction signal is input to the reproduction signal processing unit 3 via the shielded line 4 so that an external noise signal is not mixed in before the reproduction signal is transmitted to the reproduction signal processing circuit. Has been done.

Further, the reproduction signal processing section 3 is adapted to input a reproduction signal through the connector 6, whereby when the magnetic head is worn, for example, the magnetic head can be replaced together with the rotary drum 2 so that the replacement work can be simplified. ing.

D Problem to be Solved by the Invention However, when a reproduction signal is transmitted through the shield wire 4 in this way, there is a problem that processing of the shield wire 4 and connection to the rotary drum 1 side become complicated.

Further, since the core wire of the shield wire 4 is exposed at the connecting portion on the rotary drum 2 side and the connector 6, the shield effect cannot be obtained at this portion, and an external noise signal may be mixed from this portion.

There is also a problem that the electrostatic capacitance of the shielded wire 4 is added to the input capacitance of the reproduction signal processing unit 3 and the high frequency characteristic of the reproduction signal is deteriorated accordingly.

One way to solve this problem is to use shielded wire 4
A method of using a three-layer flexible cable instead of the above has been considered.

That is, the reproduction signal is transmitted by the intermediate copper foil pattern, and the reproduction signal is shielded by the copper foil patterns above and below it.

According to this method, the processing of the shield wire 4 can be omitted and the connection to the rotary drum 1 side can be simplified.

However, even in this method, there is a problem that the noise signal cannot be avoided from the connection portion and the capacitance is rather increased.

The present invention has been made in consideration of the above points, and an object thereof is to propose a magnetic reproducing apparatus capable of effectively avoiding deterioration of a reproduced signal with a simple configuration.

E Means for Solving the Problems In order to solve the problems, in the present invention, a connector portion 18A provided so as to project outward from the magnetic head device and to which an output signal from the magnetic head device is supplied, A jack section 20 into which the connector section 18A is inserted, a reproduction signal processing circuit for processing an output signal supplied from the magnetic head device via the jack section 20, a jack section 20 and a reproduction signal processing circuit are housed, and the jack is included. A section (20) and a shield case (24) for shielding the reproduction signal processing circuit are provided.

F action Insert the jack portion 20 of the reproduction signal processing circuit directly into the connector portion 18A protruding outward from the magnetic head device, and insert the reproduction signal processing circuit and the jack portion 20 (hence the connector portion 18A) into the shield case 24. Thus, the shield can prevent the reproduction signal from being deteriorated by an external noise signal and prevent the reproduction signal processing circuit from being affected by the magnetic field generated from the magnetic head device. .

G Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 10 denotes a digital audio tape recorder as a whole, which reproduces an audio signal recorded on the magnetic tape 1 in a magnetic head device.

That is, in the magnetic head device, the magnetic tape 1 travels at a predetermined speed while being wound around the rotary drum 18 by the tilt guides 14 and 16.

The rotary drum 18 outputs the reproduction signal of the magnetic head through a printed wiring board connected to the fixed side of the rotary transformer.

The printed wiring board is provided with a connector portion 18A that is inserted into the jack portion 20 of the reproduction signal processing portion 22, and at a substantially intermediate position between the inclined guides 14 and 16,
The connector portion 18A is arranged so as to project outward from the magnetic head device.

The reproduction signal processing unit 22 accommodates the reproduction signal processing circuit in a rectangular shield case 24, and
The jack portion 20 is housed so as to face the opening provided on the front surface of 24.

As a result, the shield case 24 of the reproduction signal processing unit 22,
The jack section 20 is shielded together with a built-in reproduction signal processing circuit.

In the above configuration, the reproduction signal processing circuit of the reproduction signal processing unit 22 directly inserts the jack 20 into the connector 18A to directly connect the connector 18A protruding outward from the rotary drum 18 (and hence the magnetic head device). Connected to the magnetic head device, thereby processing the reproduction signal output from the magnetic head device in a state of being arranged in a position close to the magnetic head device.

Therefore, the reproduction signal can be directly input to the reproduction signal processing circuit of the reproduction signal processing unit 22 without passing through a shield line or the like, and the high frequency characteristic deterioration due to the electrostatic capacitance of the shield line can be avoided accordingly.

Further, in this connection state, the jack portion 20 (and accordingly the connector portion 18A inserted therein) is shielded by the shield case 24 together with the reproduction signal processing circuit,
As a result, it is possible to effectively avoid the possibility that the reproduction signal is deteriorated by a noise signal from the outside, and even though the reproduction signal processing circuit is arranged in the vicinity of the magnetic head device, It is possible to prevent the influence of the generated magnetic field.

Incidentally, by inserting the jack portion 20 directly into the connector portion 18A, it is not necessary to use a shield wire or the like as a means for connecting the reproduction signal processing circuit to the magnetic head device. It is possible to effectively avoid the problems caused by the use, that is, the increase in capacitance and the mixing of noise signals.

In the embodiment described above, the connector portion 18A is projected from a substantially middle position between the inclined guides 14 and 16 and inserted into the connector 20, but the present invention is not limited to this, and for example, As shown in FIG. 2, the connector portion may be projected from a position between the inclined guides 14 and 16 which is close to the inclined guide 16.

At this time, the shape of the shield case 26 can be changed from a rectangular shape to various shapes depending on the position of the connector portion.

In the above embodiment, the case where the reproduction signal is amplified by the reproduction signal processing circuit and then the frequency characteristic is corrected has been described. However, the present invention is not limited to this, and when other circuits such as a demodulation circuit are also incorporated Further, it can be widely applied to the case where only the reproduction signal processing circuit amplifies and outputs.

Further, in the above-mentioned embodiment, the case where the present invention is applied to the digital audio tape recorder has been described, but the present invention is not limited to this, and the magnetic reproduction for processing the reproduction signal output from the rotary drum such as the video tape recorder. It can be widely applied to devices.

Further, as shown in FIG. 3, the cassette tape recorder 30 processes the reproduction signal output from the magnetic head device having the fixed head 32 as well as the magnetic reproduction device processing the reproduction signal output from the rotary drum. It can also be applied in cases.

That is, the reproduction signal is output from the fixed head 32 via the connector section 32A, and the connector section 32A is inserted into the connector 34, thereby outputting the reproduction signal to the amplifier circuit.

At this time, the connector 34 is shielded by the shield case 36 so as to surround the connector 34, whereby the deterioration of the reproduced signal can be effectively avoided by a simple connection.

As described above, according to the present invention, the jack portion of the reproduction signal processing circuit is directly inserted into the connector portion projecting outward from the magnetic head device, and the reproduction signal processing circuit and the jack portion (correspondingly, By shielding the connector part) with a shield case, the reproduction signal processing circuit can prevent the reproduction signal from deteriorating due to an external noise signal, and can be affected by the magnetic field generated from the magnetic head device. You can avoid it.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a first embodiment of a magnetic reproducing apparatus according to the present invention, and FIG. 2 is a plan view showing a second embodiment.
FIG. 3 is a schematic perspective view showing a third embodiment, and FIG. 4 is a schematic perspective view showing a conventional digital audio tape recorder. 1 ... Magnetic tape, 2,18 ... Rotary drum, 4 ... Shield wire, 18A, 32A ... Connector section, 20,34 ... Jack section, 22 ... Playback signal processing section, 24,26,36 ... … Shield case.

Claims (1)

(57) [Scope of utility model registration request] 1. A connector part provided so as to project outward from a magnetic head device, to which an output signal from the magnetic head is supplied, a jack part into which the connector part is inserted, and the jack part through the jack part. A reproducing signal processing circuit for processing an output signal supplied from the magnetic head device, and a shield case for housing the jack section and the reproducing signal processing circuit and for shielding the jack section and the reproducing signal processing circuit. Magnetic reproducing apparatus characterized by.