JPS60153012A - Connecting device between optical fiber and light transmitter and receiver - Google Patents

Abstract

PURPOSE:To reduce transmission losses due to attachment and datachment by connecting a light emitting electric connector and a photodetecting electric connector by the fixed electric connector of a light transmitter and receiver. CONSTITUTION:The light emitting electric connector 15 contains a light emitting element 11 and the coupling part with which an end part of an optical fiber 13 for transmission at the outside of a housing is coupled, and is constituted into a detachable connector which makes an electric connection. The photodetecting electric connector 15' is also constituted into a connector of the same structure with the light emitting electric connector 15. Fixed electric connectors 17 and 17' are fixed to a light transmitter and receiver 16 and connected to an input electric circuit 18 and an output electric circuit 19 through lead wires 20 and 20' respectively. Therefore, the light emitting and photodetecting electric connectors 15 and 15' are connected electrically with the fixed electric connectors 17 and 17' by engagement.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention makes it possible to significantly reduce optical loss and its fluctuations due to attachment and detachment between the device body and the optical fiber portion in signal transmission and sensor devices using optical fibers. 2. Description of the Related Art Examples of connecting optical fibers and receivers and their configurations and problems There are optical fiber links and optical fiber sensor devices that utilize optical fibers as light transmission paths. Conventionally, these devices have been configured to optically connect a housing housing an electric circuit to a long external optical fiber transmission line using a detachable optical connector to facilitate handling. FIG. 1 shows an example of a conventional configuration of an optical fiber type magnetic field sensor.

In the figure, (1) is the light emitting element, (2) is the input electric circuit for making the light emitting element emit light, (3) is the forward transmitter and the optical fiber in the receiver, and (4) is the forward transmitter that houses the receiver. (5) is an optical connector provided in the housing that houses the receiver, (6) is an optical fiber for external transmission, (7) is an optical magnetic field sensor, (6 is for external transmission Optical fiber for external transmission same as optical fiber (6), (4 optical connectors same as optical connector (4), (3 optical fibers in the same housing as optical fiber (3), (8) light receiving element , (9) represents an output circuit that detects the output of the light receiving element.

The problem with such a configuration is the optical connector (5), rζ
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- The connection loss of the dedicated 1 connector (5) is large and fluctuates each time it is connected and disconnected.This limits the transmission distance and reduces reliability in communication transmission, and In sensor devices, this causes measurement accuracy to deteriorate.This is because most optical fiber sensors convert measurement information into light intensity, so fluctuations in loss are mistakenly recognized as fluctuations in direct measurement values. Second, in order to reduce this connection loss, extremely high processing accuracy is required, which results in a lack of mass productivity and high costs.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a connection device between an optical fiber, a light transmitter, and a receiver, in which the connection loss and its fluctuation are extremely small.

Composition of the Invention The present invention provides a light-emitting electrical connector configured to accommodate and detach a coupling portion in which one end of an optical fiber and a light-emitting element are coupled, and a light-receiving electrical connector having the same structure as the light-emitting electrical connector. The receiver housing is provided with two fixed electrical connectors,
The light-emitting electrical connector and the light-receiving electrical connector are connected to each other in the fixed electrical connector of the optical receiver.

DESCRIPTION OF EMBODIMENTS FIG. 2 shows a configuration diagram of an embodiment of a connection device for connecting an optical fiber, a light transmitter, and a receiver according to the present invention.

In the figure, Qll is a light emitting element, o2 is a light receiving element,
θ''! ri is the transmission optical fiber outside the housing, o41 is the sensor, 05) is the light emitting electrical connector, Qa) is the light receiving electrical connector, α6) is the optical transmitter, receiver, frame, 07 is the fixed electrical connector, eel does not indicate the input electrical circuit, and Q!II indicates the output electrical circuit.

The light-emitting electrical connector 0■ is a connector that accommodates the coupling part of the light-emitting element 0υ and the end of the transmission optical fiber Q31 outside the casing, and is also a connector that allows detachable electrical connection. The connector has the same structure as the light emitting electrical connector 05). Fixed cable connector αη
, (17 is optically transparent and is fixed to the receiver, 05') and fixed electrical connectors aη, θ7 are configured so that they can be electrically fitted and connected.

In the present invention, based on the above configuration, a light transmitting device, a receiver θ
e and the optical fiber part are connected to each other by emitting and receiving electrical connectors Q5), (15) and fixed electrical connectors (171).
% (17). Therefore, the transmission loss at this connection part and the loss fluctuation due to connection and disconnection are significantly smaller than the conventional structure in which connection is made through an optical connector. The coupling part between the receiver and light emitting element and the optical fiber in Q51° (15') is a permanent connection or a solid connection that is not normally attached or detached, so the transmission loss is small and it is hardly affected by vibration or dust.

Effects of the Invention As described above, the present invention enables a connection between an optical fiber, an optical fiber, and a receiver with extremely little transmission loss and fluctuation thereof due to attachment/detachment. Therefore, when applied to communication transmission, the transmission distance can be reduced. can expand and improve reliability.
Optical fiber type sensor device 1, -aIll-I-i Kot
,-t'IJilira)! f1) 41+1'fJ'l
-n+'/1151. In addition, it has the advantage of being able to be used in places with a lot of dust or vibrations.

[Brief explanation of the drawing]

Fig. 1 shows an example of a connection device between an optical fiber, a light transmitter, and a receiver applied to a conventional optical fiber type magnetic field sensor, and Fig. 2 shows an example of a connection device between an optical fiber, a light transmitter, and a receiver according to the present invention. A diagram applied to a sensor is not shown. 15: Light emitting electrical connector 15': Light receiving electrical connector 1
6: Transparent, receiver 17.17': Fixed electrical connector 1
8: Input electric circuit 19: Output electric circuit 20: Re
- Patent Applicant for Dohesen Patent Attorney Matsushita Electric Industrial Co., Ltd. Isao Abe No. 119. +1 Figure 2

Claims (1)

[Claims] A light-emitting electrical connector configured to accommodate and detach a coupling part that combines one end of an optical fiber and a light-emitting element, and a light-receiving electrical connector having the same structure as the light-emitting electrical connector, and having an input electrical circuit and an output electrical circuit. Two fixed electrical connectors are provided in the casings of the transmitter and receiver (the optical fiber and the receiver are connected to the light-emitting electrical connector and the light-receiving electrical connector in the fixed electrical connector of the transmitter and receiver, respectively). , connection device with receiver.