JPH02276016A - Rotary head - Google Patents

Abstract

PURPOSE:To prevent the generation of noise due to the poor contact between a slip ring and a brush by using a solar battery and a constant voltage circuit as the power source of an amplifying circuit in a main body. CONSTITUTION:A solar battery 1 is provided on the upper part of a rotor, a constant voltage circuit 4 using the solar battery 1 as the power source, amplifying circuits 5 and 6 to amplify the minute signals of magnetic heads 7 and 8 operated by the constant voltage circuit 4, and a primary coil 9a of a rotary transformer 9 are possessed, and a secondary coil 9b of the rotary transformer 9 is possessed fora stator. Further light source lamps 2 and 3 which emit light to the solar battery 1 are provided, and the output of the solar battery 1 is supplied through a constant voltage circuit 4 to the amplifying circuits 5 and 6. Thus since the slip ring and the brush are not used to supply the power source to the amplifying circuits 5 and 6, the noise generation due to the poor contact between the slip ring and the brush can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary head used in VTRs (video tape recorders), DATs (digital audio tapes), and the like.

[Conventional technology]

Conventionally, rotary heads used in VTRs (video tape recorders), DATs (digital audio tapes), etc. have a magnetic head and a primary coil 10 on the rotor 12a side, as shown in FIGS. 3(a) and (b). and a secondary coil 11 on the stator 12b side. Further, in the figure, 13 is a motor shaft, and 14 is a show 1 to ring.

[Problem to be solved by the invention]

The above-mentioned conventional rotary head has the disadvantage that it is easily affected by noise because a weak signal is directly passed through a rotary transformer having a primary coil 10 and a secondary coil 11.

For this reason, there are cases where an amplifier circuit is installed inside the rotary head for amplification and then passed through a rotary transformer, but in this case the power for the amplifier circuit is supplied via a slip ring and brushes.

There was a problem of noise generation due to poor contact.

An object of the present invention is to provide a rotary head that solves the above problems.

[Differences between the invention and the prior art]

The present invention differs from the conventional rotary head described above in that a slip ring and brush are not used to supply power to the amplifier circuit within the rotary head.

[Means to solve the problem]

In order to achieve the above object, a rotary head according to the present invention includes a solar cell on the top surface of a rotary head body used for a VTR (video tape recorder), a DAT (digital audio tape), etc.; The device further includes a constant voltage circuit using the solar cell as a power source, and an amplifier circuit operated by the constant voltage circuit to amplify a weak signal from the rotary head.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a circuit diagram.

In FIG. 1, a rotary head according to the present invention includes a solar cell 1 on the upper part of a rotor 12a, and a constant voltage circuit 4 using the solar cell 1 as a power source.

Amplifying circuits 5 and 6 that are operated by the constant voltage circuit 4 and amplify a weak signal from the magnetic head 7.8, and a rotary transformer 9.
The stator 12b has a primary coil 9a of the rotary transformer 9, and a secondary coil 9b of the rotary transformer 9.

Furthermore, a light source lamp 2°3 for irradiating light onto the solar cell 1 is provided. The output of the solar cell 1 is supplied to amplifier circuits 5 and 6 via a constant voltage circuit 4.

The outputs of the magnetic heads 7 and 8 are amplified by amplifier circuits 5 and 6, respectively, and then outputted via a rotary transformer 9.

〔Effect of the invention〕

As explained above, the present invention uses a solar cell and a constant voltage circuit as the power source for the amplifier circuit in the rotary head, thereby preventing noise caused by poor contact between the slip ring and the brush, which has been a problem in the past. This has the effect of improving the signal-to-noise ratio by 10 dB or more.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a circuit diagram thereof, and FIG. 3(a) is a plan view showing a conventional example. (b) is a longitudinal sectional view of the same. 1... Solar cell 2, 3... Light source lamp 4
・・・ Constant voltage circuit 5, 6 ・ Amplifier circuit 7.8 ・
...Magnetic spatula 1<9...Rotary transformer Fig. 3 Fig. 3

Claims (1)

[Claims] (1) A solar cell is provided on the top surface of the rotary head main body used in a VTR (video tape recorder), DAT (digital audio tape), etc., and a constant voltage circuit using the solar cell as a power source is installed within the rotary head main body. and an amplification circuit that is operated by the constant voltage circuit and amplifies a weak signal from the rotary head.