JPH0490635A - Light transmission part of optical transmission device - Google Patents

Abstract

PURPOSE:To prevent the damage of eyeballs of an operator at the time of removing a connector by providing the interruption mechanism of a light beam emitted at the time of removing a light connector. CONSTITUTION:Mechanisms 24-27 detecting the installation/removal of a light connector 15 are provided in the light connector 15. When the attach/detach detection mechanism 24-27 of this light connector 15 detects the detaching of the light connector 15, the driving of a laser diode is stopped, and the driving of the laser diode is performed on condition the connection of the light connector. Thus, the eyes of the operator does not harmed even when peeping at the light connector part in the detached state to the optical connector 15 since the device is automatically stopped emitting when the light connector 15 is detached.

Description

[Detailed Description of the Invention] [Summary of the Invention] Regarding the light transmitting section of an optical transmission device, particularly its output light blocking mechanism, a light blocking mechanism is provided to avoid damage to the eyeballs of a worker when a connector is removed. With the aim of The configuration is such that driving of the laser diode of the transmitting section is stopped.

[Industrial application field]

TECHNICAL FIELD The present invention relates to an optical transmission section of an optical transmission device, particularly to a mechanism for blocking output light thereof.

The transmitting section of the optical transmission device encodes the input signal, modulates the driving current of the laser diode with the encoded signal, obtains an optical signal, and sends this to the optical cable. The optical transmitter is assembled into an optical transmission panel and connected to an optical cable using an optical connector. The present invention relates to a mechanism for blocking the light beam emitted when the optical connector is removed.

[Conventional technology]

FIG. 5 shows the configuration of a transmitting section of a conventional optical transmission device. The input signal input to the optical transmitter is encoded by the encoder 11 and input to the drive circuit 12 .

A bias circuit 13 and an optical output stabilization circuit 14 are attached to the drive circuit 12, and supply a drive current to the laser diode LD. The drive current can be changed in strength (
Therefore, the intensity of the light emitted by the laser diode LD is also modulated, which becomes an optical signal and is sent to the optical cable 16 through the optical connector 15, and then to the other party.

The bias circuit 13 supplies an optimum bias current to the laser diode LD having dark value current characteristics. That is, the drive current (this is the bias current) when the signal O is present is at the bend of the polygonal characteristic, and the drive current when the signal I is set is a predetermined value that is larger than that. Furthermore, although the light output is easily affected by changes in ambient temperature, the stabilization circuit 14 stabilizes this so that the light output remains constant even if the ambient temperature fluctuates.

[Problems to be Solved by the Invention] The optical connector 15 consists of a receptacle side 15a and a plug side 15b, the former being fixed to an optical transmitter (light transmitting panel),
The latter is attached to the optical cable 16 (of course, the reverse is also possible), and is connected by inserting the plug 15b into the receptor 15a, and disconnected by removing the plug from the receptor.

Incidentally, the optical connector (plug side) may be removed during testing or maintenance. If the optical transmitting section is still in operation at this time, the optical signal will be emitted from the receptacle side to the outside air, and if the operator looks at the receptacle section, the optical signal may enter the operator's eyes and cause damage to the eyeballs.

The present invention aims to improve this problem by providing a light blocking mechanism to avoid damage to the eyeballs of the operator when the evacuator is removed.

[Means for Solving the Problems] As shown in FIG. 1, in the present invention, an optical connector is provided with a mechanism for detecting attachment/detachment of the optical connector.

This detection mechanism consists of conductor sleeves 24, 26, an insulator 25 between them, and an insulating tube 23 surrounding them. The light guide 22 on the light transmission panel side (receiver side) fits into one end of the conductor sleeve 24 (the side opposite to the insulator 25), and the light guide 27 on the plug side fits into the conductor sleeve when connecting the optical connector. 26, insulator 25, conductor sleeve 2
4 and comes into contact with the end surface of the light guide 22. light guide 22
The outer periphery of ゜27 is a conductor.

When the optical connector attachment/detachment detection mechanism detects detachment of the optical connector, it stops driving the laser diode, and drives the laser diode on condition that the optical connector is connected.

[Effect]

FIG. 1(a) shows the state before the optical connector is connected (during insertion), and FIG. 1(b) shows the state after the optical connector is connected. In (b), the optical conductors 22 and 27 on the receptor side and the plug side are in contact with each other, and the optical signal is transmitted without leaking to the outside. A circuit with the path , is created. In (a), the insulator 25
This circuit cannot be done because it is blocked by This allows detection of connection and release of the optical connector.

In FIG. 1, the conductor sleeve 26 is grounded and the conductor sleeve 2
4 is connected to the laser diode drive circuit 12.

If this is part of the ground wiring for the drive current of the laser diode, the light will automatically stop emitting light when the optical connector is removed, and the operator's eyes will not be hurt even if he or she looks into the optical connector.

[Example] The conductor sleeve 24, the insulator 25, the conductor sleeve 26, and the conductor on the outer periphery of the optical conductor 27 in FIG. 1 constitute a switch,
This switch may be used not only as a grounding circuit for the drive current, but also for driving an appropriate mechanism for cutting off output light.

The ring of the plug-side optical connector is movable in the axial direction and has a thread cut on its inner periphery, and is screwed into the thread of the receptor-side main body part 21 by pushing it out and turning it.

FIG. 2 shows an optical transmitter of the present invention. The same parts as in FIG. 5 are given the same reference numerals. The difference from FIG. 1 is that the optical connector 15 has the structure shown in FIG. 1, and the difference from FIG. is different.

FIG. 3 shows a detailed perspective view of the receptor section of the optical connector. Reference numerals 31 and 32 denote holders, into which the sleeve 33 is inserted, and a ring 34 is fitted around the outer periphery of the holders 31 and 32. These are inserted into the main body 21 and the light guide 22
．． 27 is inserted into the sleeve 33, so the sleeve 33 has a C-shaped cross section to provide elasticity. In the present invention, this sleeve 33 is connected to the conductor sleeve 24 as shown in FIG.
．． 26, this can be realized by using an insulator 25 between them.

(Effects of the Invention) As explained above, in the present invention, when the plug side of the optical connector is pulled out, the laser diode stops emitting light, and when the plug side of the optical connector is inserted, the laser diode starts emitting light.
Therefore, even if you look at the receptacle side of the optical connector with the plug side of the optical connector unplugged, the output light from the optical transmitter will not hurt your eyes.

Furthermore, if the plug side of the optical connector is insufficiently inserted into the receptor side, the switch will not close and the laser diode will not emit light. In order to cause the laser diode to emit light, it is necessary to fully insert the plaque side of the optical connector into the receptor side and close the switch. This allows the operator to tighten the optical connector in the event that the optical connector is disconnected or not tightened sufficiently (in such a case, if it is emitting light, it may come out). To reliably prevent the output light from hurting the eyes due to looking directly at the receptacle part.

[Brief explanation of the drawing]

FIG. 1 is a diagram of the principle of the present invention, FIG. 2 is a block diagram of the optical transmitter of the present invention, FIG. 3 is an exploded perspective view of the receptor side of the optical connector, and FIG. 4 is a perspective view of the sleeve of the present invention. FIG. 5 is a block diagram of a conventional optical transmitter. In FIG. 1, 15a is the receptor side of the optical connector, 15b is the plug side, 24, 26 is a conductor sleeve, and 25 is an insulator. Principle diagram of the present invention Figure 1 Input signal Figure 2 A block diagram of the transmitting section of the present invention 7. ') Perspective view Fig. 4 Flock diagram of conventional optical transmitter Fig. 5

Claims (1)

[Claims] 1. In an optical transmitting section of an optical transmission device that connects an optical cable (16) with an optical connector (15), a mechanism (24--
27), and the output of the detection mechanism causes a laser diode of the optical transmitter to stop driving when the optical connector is removed. 2. On the receptor side of the optical connector, the first
conductor sleeve (24) and an insulator (25) in front of it.
A second conductor sleeve (26) provided through the second conductor sleeve (26) and an insulating tube (23) surrounding the second conductor sleeve (26), the optical connector (
27) is inserted into the second conductor sleeve, the insulator, and the first conductor sleeve, the first conductor sleeve, the conductor on the outer periphery of the optical conductor of the plug-side optical connector;
Claim characterized in that an electric circuit is formed in the path of the second conductive sleeve, and when the plug-side optical connector is removed, the electric circuit is disconnected to constitute an optical connector attachment/removal detection mechanism. 1. An optical transmission section of the optical transmission device according to 1.