JPH052121A - Optical transmitter - Google Patents

Abstract

PURPOSE:To perform large-output optical transmission in safety. CONSTITUTION:A laser diode 41 has one end connected to a power source through a resistor 42 and the other end connected to the collector of a transistor(TR) 43, whose base is connected to a signal source 44. Further, the emitter of the TR 43 is grounded through a relay switch 45. Further, a coated optical fiber 46 connected to the center conductor 11 of a pin plug 1 is connected to the power source through a resistor 47 and a mesh wire 48 connected to the external electrode 12 of the pin plug 1 is grounded through a relay solenoid 49. Further, a coated optical fiber 52 connected to the electrode 32 of a pin jack 3 is connected to a mesh wire 54 connected to the external electrode 33 of the pin jack 3 through a resistor 53.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical transmission device used when transmitting a video signal by an optical cable, for example.

[0002]

2. Description of the Related Art For example, a device for transmitting a digital audio signal of a CD player to an audio amplifier or the like using an optical cable has been put into practical use. In this case, a conventional optical signal used for transmission of a digital audio signal has a small output, and even if the optical cable connector is disconnected, this does not pose a serious danger.

On the other hand, transmission of a video signal by an optical cable is being studied. Therefore, in the case of optically transmitting a video signal, it is necessary to increase the output of the optical signal, and it is conceivable to use laser light, for example. However, in that case, the high-power laser light is dangerous because, for example, if it enters the human eye, it may damage the laser light.

[0004]

The problem to be solved is that a high-power optical signal poses a risk of damage to the human eye, for example.

[0005]

According to the present invention, an optical cable connector (pin plug 1, pin jack 3) is provided with electrodes (center conductor 11, electrode 32, outer electrodes 12, 33),
It is an optical transmission device capable of discriminating the connection of the connector.

[0006]

According to this, it is possible to discriminate the connection of the connector and prevent the optical signal from being output when the connector is disconnected.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, an optical cable connector compatible with, for example, a so-called pin connector is proposed. That is, in this connector, an optical cable 21 for optical transmission is inserted inside the center conductor 11 of the pin plug 1, one end of which is exposed at the tip, and one end of the optical cable 22 is attached to the bottom of the center hole 31 of the pin jack 3. The department is facing. The pin plug 1 and the pin jack 3 have the same structure as that of a conventional pin connector. The pin plug 1 has a center conductor 11 and an outer electrode 12, and the pin jack 3 has electrodes around a center hole 31. 32 and an outer electrode 33 are provided.

In the transmitter 4, for example, one end of the laser diode 41 is connected to the power source through the resistor 42, and the other end of the laser diode 41 is connected to the transistor 4.
3 and the base of the transistor 43 is connected to the signal source 44. As a result, the optical signal emitted from the laser diode 41 is transmitted to the optical cable 21.
Is supplied to the other end. Further, the optical signal from the other end of the optical cable 22 is applied to the phototransistor 51 of the receiving unit 5, and the optical signal is detected.

In this device, the emitter of the transistor 43 is also grounded via the relay switch 45. Further, the core wire 4 connected to the central conductor 11 of the pin plug 1
6 is connected to the power source through the resistor 47, and the pin plug 1
The mesh wire 48 connected to the outer electrode 12 is grounded via the relay solenoid 49. Further, the core wire 52 connected to the electrode 32 of the pin jack 3 is connected to the mesh wire 54 connected to the outer electrode 33 of the pin jack 3 via the resistor 53.

Therefore, in this device, when the optical cable connector by the pin plug 1 and the pin jack 3 is connected, the center conductor 11 of the pin plug 1 and the electrode 32 of the pin jack 3 are connected, and the outer electrode 12 of the pin plug 1 is connected.
And the outer electrode 33 of the pin jack 3 are connected. As a result, the power supplied to the core wire 46 is the center conductor 11, the electrode 32, the core wire 52, the resistor 53, the outer electrode 33, and the mesh wire 5.
4, supplied to the relay solenoid 49 through the outer electrodes 33 and 12, and the mesh wire 48, the relay switch 45 is turned on, and the laser diode 41 is put into an operating state.

That is, in this device, the pin plug 1
When the optical cable connector by and the pin jack 3 is not connected, the laser diode 41 does not operate, and there is no danger that a dangerous high-power laser beam or the like will be generated when the optical cable connector is disconnected. You can

Thus, according to the above apparatus, it is possible to discriminate the connection of the connectors (pin plug 1 and pin jack 3) and prevent the optical signal from being output when the connectors are disconnected.

Therefore, since the optical signal is not generated unless the connector is connected, the safety is improved and it is possible to confirm whether or not the connection is made.
Further, it is possible to prevent erroneous connection between the transmitting sides.

Further, FIG. 2 shows the configuration of another example. Note that the specific configurations of the pin plug 1 and the pin jack 3 are omitted in the drawing. Therefore, in this example, the switching transistor 61 is used instead of the relay switch 45 and the relay solenoid 49 described above.
The emitter of 3 is grounded via the transistor 61, and the mesh wire 48 is grounded via the resistor 62.
Further, the mesh wire 48 connects the transistor 6 through the resistor 63.
1 is connected to the base. Also in this example, the same effect as the above can be obtained.

FIG. 3 shows the structure of still another example. In this figure, a resistor 71 is inserted between the resistor 47 and the power source, and the potential difference between both ends of the resistor 71 is detected by the operational amplifier 72. Furthermore, this operational amplifier 72
Is supplied to the base of a transistor 73 provided in parallel with the signal source 44. The mesh lines 48 and 54 are grounded. Also in this example, the same effect as the above can be obtained. Also, in this example, the core wires 46, 52
Can be supplied with a high frequency signal from a signal source 75 via a capacitor 74, which signal is
Can be taken out to the output terminal 77 via.

In the above example, the optical cable connector is compatible with the so-called pin connector, but the optical cable connector is not limited to the above example. That is, FIG. 4 shows another example of the optical cable connector, in which one end of the optical cable 21 is exposed to the bottom surface of the recess of the plug 81 and the optical cable 22 is provided at the center of the end surface of the terminal 90 provided in the device. One end of is exposed. A first electrode 81 is provided on the bottom surface of the recess of the plug 80, and a second electrode 81 is provided on the peripheral surface of the recess.
Electrodes 82 are provided. Further, a third electrode 91 is provided on the end surface of the terminal 90, and a fourth electrode 92 is provided on the peripheral surface of the terminal 90.
Is provided.

Therefore, also in this optical cable connector, it is possible to obtain the same effect as the above by using the first to fourth electrodes 81, 82, 91 and 92. Further, in this case, as is apparent from B of the same figure, if the plug 80 is not sufficiently inserted into the terminal 90, the electrodes 81 and 91 will not be connected, so that the connection can be completed more completely.

[0018]

According to the present invention, it is possible to discriminate the connection of the connector and prevent the optical signal from being output when the connector is disconnected.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an example of an optical transmission device according to the present invention.

FIG. 2 is a configuration diagram of another example.

FIG. 3 is a configuration diagram of still another example.

FIG. 4 is a configuration diagram of another example of the optical cable connector.

[Explanation of symbols]

 1 pin plug 11 center conductor 12 outer electrode 21, 22 optical cable 3 pin jack 31 center hole 32 electrode 33 outer electrode 4 transmitter 41 laser diode 42, 47 resistor 43 transistor 44 signal source 45 relay switch 46 core wire 48 net wire 49 relay solenoid 5 Receiver 51 Phototransistor 52 Core wire 53 Resistor 54 Net wire

─────────────────────────────────────────────────── ───Continued from the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H01S 3/025 3/18 9170-4M

Claims (1)

Claim: What is claimed is: 1. An optical transmission device, wherein electrodes are provided on an optical cable connector so that connection of the connector can be discriminated.