JPH041901A - Rotary drum device - Google Patents

Abstract

PURPOSE:To prevent the induction of the external noises and to reduce the installing space of this rotary drum device by performing the optical transmission/reception of signals between the rotary drum and the outside of the drum by means of an optical transmission means provided in a rotary shaft. CONSTITUTION:A 1st electrooptical conversion means 7a is provided outside a rotary drum 1 and outputs the recording optical signals after converting the electric signals to be recorded into the optical signals. Meanwhile a 1st photoelectric converting means 5a is provided in the drum 1 and supplies the received recording optical signals to a recording head 2 after converting them into the electric signals. Furthermore, a 2nd electrooptical converting means 5b is provided in the drum 1 and converts the electric signals regenerated by a reproduction head 2 into the optical signals to output the reproduced optical signals. Then a 2nd photoelectric converting means 7b is provided outside the drum 1 and converts the received reproduced optical signals into the electric signals. An optical transmission means 4a is added within a rotary shaft of the drum 1 and transmits the reproduced optical signals and the recording optical signals. In such a constitution, the signals are transmitted/received between the inside and the outside of the drum 1 by means of the optical signals. Thus no external noise is produced and the installing space is reduced for a rotary drum device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotating drum device, and more particularly to a rotating drum device that transmits and receives signals between the rotating drum and the outside of the rotating drum using optical signals.

[Conventional technology]

Conventionally, this type of rotating drum device forms a rotary transformer by installing coils inside and outside the rotating drum, and when recording signals, the coil outside the rotating drum converts an electric signal into a magnetic signal, and this magnetic A coil inside the rotating drum detects the signal and converts it into an electrical signal, which is then output to the head for recording. During signal playback, the reproduced electrical signal from the head is converted into a magnetic signal by a coil inside the rotating drum. This magnetic signal was converted into an electrical signal by a coil outside the rotating drum, and then signal processing was performed.

[Problem to be solved by the invention]

The conventional rotating drum device described above uses a rotary transformer to send and receive signals, so it is susceptible to external noise induction, and it is difficult to set the resonance point and turns ratio of the coil according to the signal band, and to create multiple channels. It had some drawbacks, such as:

[Means to solve the problem]

The rotating drum device of the present invention includes a first electro-optical converter arranged outside the rotating drum for converting an electrical signal to be recorded into an optical signal and outputting a recording optical signal, and a first electro-optical converting means arranged inside the rotating drum for converting the electrical signal to be recorded into an optical signal and outputting the recording optical signal. a first photoelectric conversion means that receives the signal, converts it into an electric signal, and supplies it to the recording head; and a first photoelectric conversion means arranged in the rotating drum that converts the electric signal reproduced by the reproducing head into an optical signal and outputs a reproduced optical signal. a second electro-optical conversion means;
a second photoelectric conversion means disposed outside the rotary drum for receiving the reproduction optical signal and converting it into an electric signal; and a second photoelectric conversion means disposed within the rotation axis of the rotary drum for transmitting the reproduction optical signal and the recording optical signal. It is equipped with a transmission means.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a sectional view of a rotating shaft with a built-in optical transmission means used in this embodiment.

This embodiment includes an electro-optical conversion means 7a arranged outside the rotating drum 1 for converting an electrical signal to be recorded into an optical signal and outputting a recording optical signal, and an electro-optical converting means 7a arranged inside the rotating drum 1 for receiving the recording optical signal and outputting an electrical signal. A photoelectric conversion means 5a converts the electric signal into an optical signal and supplies it to the rotary head 2 for recording, and converts the electric signal reproduced by the rotary head 2 for reproduction disposed inside the rotary drum 1 into an optical signal and outputs the reproduced optical signal. Lightning conversion means 5b
, a photoelectric conversion means 7b disposed outside the rotating drum 1 for receiving the reproduced optical signal and converting it into an electric signal, and an optical transmission means disposed within the rotation shaft 4 of the rotary drum 1 for transmitting the reproduced optical signal and the recording optical signal. 4a.

In this embodiment having such a configuration, when recording a signal, the recording electric signal is converted into an optical signal by the electro-optical conversion means 7a provided directly below the rotation shaft of the drum motor 6, and the optical transmission means 4a provided inside the rotation shaft 4 converts the recorded electrical signal into an optical signal. It is transmitted to the rotating drum 1 by.

FIG. 2 shows an example of the optical transmission means provided within the drum rotating shaft 4. As shown in FIG. A1. A2. B1. Separate optical transmission lines 11 to 18 are provided for recording and reproduction for each of the four heads of B2.
This is provided. Also, since it is a rotating shaft, the optical transmission means 4a
The optical transmission lines 11 to 18 were concentric circles. The optical signal sent by the optical transmission means 4a is converted into an electric signal by the photoelectric conversion means 5a in the rotary drum 1, and after performing the processing necessary for signal recording, the rotary head 2 records it on a magnetic tape. .

On the other hand, during signal reproduction, the reproduced signal from the rotary head 2 is converted into an optical signal by the electro-optical conversion means 5b within the rotary drum 1, and transmitted to the photo-electric conversion means 7a directly below the rotation axis by the optical transmission means 4a within the rotation shaft 4. and converts it into an electrical signal. Thereafter, reproduction processing is performed by an external signal processing unit 8.

In this embodiment, the case of four heads and four sets of optical transmission lines each for the outgoing and return paths is illustrated, but the same can be applied to other quantities, and the arrangement of the optical transmission lines can also be arranged in concentric circles. The arrangement is not limited to the shape, but may be arranged in other shapes having equivalent functions.

〔Effect of the invention〕

As explained above, the present invention can eliminate the induction of external noise by transmitting and receiving signals between the rotary drum and the outside of the rotary drum using optical transmission means provided within the rotary shaft. Even if the number of required transmission lines increases, it can be realized in a smaller space than a rotary transformer.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a sectional view of a rotating shaft with a built-in optical transmission means used in this embodiment. 1...Rotating drum, 2...Rotary head, 3.
... Lower drum, 4... Rotating shaft with built-in optical transmission means, 5a,
5b, 7a, 7b... photoelectric (1 light) conversion means, 6...
・Drum motor, 8...signal processing section, 11...Al
ch outward journey, 12-・Alch return journey, 13-B 1 c
h outward trip, 4...B...A 2h return trip, 5...A2 ch outward trip, h return trip, 7...B2 h outbound trip, 8...h return trip.

Claims (1)

[Claims] a first electro-optical conversion means disposed outside the rotating drum that converts an electrical signal to be recorded into an optical signal and outputs a recording optical signal;
a first photoelectric conversion means disposed within the rotary drum that receives the recording optical signal, converts it into an electrical signal, and supplies it to the recording head; a second electro-optical conversion means for converting the signal into a reproduced optical signal and outputting the reproduced optical signal; a second photo-electric converting means disposed outside the rotating drum for receiving the reproduced optical signal and converting it into an electric signal; A rotating drum device comprising: an optical transmission means disposed within a rotating shaft and transmitting the reproduction optical signal and the recording optical signal.