JPS59210745A - Incidental equipment of optical signal transmitter and receiver - Google Patents

Abstract

PURPOSE:To eliminate the need for a light emitting device, to decrease the power consumption of an incidental equipment and to attain the use of a battery with a small capacity by transmitting again a received optical signal via an optical switch. CONSTITUTION:An optical signal (Fig. a) from an electronic main body 20 is split into two at an optical branching circuit 16 via an optical cable 11; one reaches a photodetector 13 and the other reaches an optical switch 17. The optical signal is converted into an electric signal at the photodetector 13 and recognized by a control circuit 15. On the other hand, in transmitting the optical signal, while the light is applied from an optical branching circuit 16 to the optical switch 17 (e.g., between t2 and t3 in Fig. c), the control circuit 15 transmits a transmission signal to the optical switch 17. As a result, the optical signal as shown in Fig. (b) is transmitted to an optical cable 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thin strip device that transmits and receives optical signals to and from a 1h child device main body via an optical cable, and particularly relates to a small portable device.

Conventionally, a J2'j k-type accessory device that transmits and receives optical signals to and from the slave device main body via an optical cable is configured as shown in FIG.
The optical receiver 3 receives the optical signal sent through the optical receiver. On the other hand, the stain signal was converted into an optical signal by the light emitter 4 controlled by the control circuit 5 and sent to the electronic device main body 20 via the optical cable 2.

Therefore, the power consumption by the light emitter 4 is large, and there is a drawback that it is desirable to be able to use a low-power battery, especially in a portable accessory device.

The present invention has been made in view of the above-mentioned drawbacks. By converting the light sent from the main unit of the slave device into a signal using an optical switch and sending it out, the present invention eliminates the use of a power-consuming light emitting device. First, we will propose an auxiliary device with low power consumption.

The present invention relates to an auxiliary device that is connected to an electronic device main body via an optical cable and transmits and receives optical signals, the auxiliary device including:
An optical switch is provided that switches or blocks the optical path under the control of electrical signals, and the light supplied from the electronic device body through the first optical cable is passed through the optical switch and sent back to the electronic device body as an optical signal. It is characterized by transmitting and receiving optical signals without using a light emitter by transmitting them through an optical cable.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows a block diagram of an optical signal transmitting/receiving apparatus equipped with an embodiment of the accessory equipment of the present invention. Is the invention right in the figure? 8
: The device 30 is connected to the electronic device main body 20 by optical cables 1 and 12, and includes an optical branch circuit 16 and a light receiver 13. It is equipped with a control circuit 15 and an optical switch 17.

The optical signal from the main body 2 () of the heavy child device is transmitted through the optical cable 11.
f! : is supplied to the i′i device 30 via the i′i device 30. 1, an optical signal is sent to the electronic device body 20 through the original cable 12. The optical branch circuit 16 branches and supplies light from the optical cable 11 to the light receiver 13 and the optical switch 17 . The optical switch 17 is a switch that shuts off or switches off light in response to a signal, and includes a mechanical operation, an electro-optical effect that changes the dielectric layer of a crystal by an electric field, and a liquid crystal switch. Available.

Next, FIG. 3 shows an optical signal within the optical cable in the above embodiment. The operation of the above embodiment will be explained below with reference to FIGS. 2 and 3. In addition, in the tree embodiment, as shown in the figure, the light on/off is controlled by MARK/B.
An asynchronous signal compatible with REAK is used.

The optical signal from the main unit 20 (FIG. 3(a)) passes through the optical cable 11 and is split into two by the optical branch circuit 16, one of which is transmitted to the optical receiver 13 and the other reaches the optical switch 17. . What is the optical signal at the receiver 13? It is converted into an I energy signal and recognized by the control circuit 15.

On the other hand, when transmitting an optical signal, the time during which light is supplied to the optical branch circuit 16 and the optical switch 17 (for example, 2
153 (between t2 and t3 in Figure (C)),
The control circuit 15 sends a transmission signal to the optical switch 17. As a result, for the optical cable 12, as shown in FIG.
)) is transmitted.

The electronic device main bodies 20i, t receive the optical signal and transmit the signal sent by the electronic device main body 2o (the signal between 11 and t2 shown in FIG. 3(e)) and the signal from the auxiliary device 3o (the signal shown in FIG. C
) of 1z7) signal between p and t3). l) Recognize the signal from the device 3o.

In addition, in the above embodiment, the start-stop 1ii1 is used as the transmission/reception signal.
Although the period (r?) is shown, real parent 4 is also possible for other signals as well.

As explained above, Kinoe tJJ transmits the received optical signal again via the optical switch, emitting light) +:
This has the effect of eliminating the need for F, lowering the power consumption of ancillary equipment, and making it possible to use a battery with a small capacity.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing a conventional example, FIG. 2 is a block diagram showing an optical signal transmitting/receiving device equipped with an embodiment of the ancillary device of the present invention, and FIG. 3 is a waveform diagram showing the signal waveform in FIG. 2. It is. 1.2, 11.12... Optical cable 3.13... Light receiver 4... Light emitter 5.1
5...ff1lJ control circuit 16...Optical branch circuit 17...Optical switch 2o...Electronic device main body 30...Applicant of auxiliary device Nippon Kameki Co., Ltd.

Claims (1)

[Claims] In an auxiliary device that is connected to the main body of an electronic device by an algebraic optical cable and transmits and receives optical signals, the auxiliary device is provided with an optical switch that connects or disconnects an optical path under the control of electrical signals, An auxiliary device for an optical signal transmitting/receiving device, characterized in that an optical signal received through a first optical cable is passed through the B-C switch, and transmitted from the switch to the electronic device main body through a second optical cable.