Optical transmission device

Abstract

An optical transmission device has a light emission element for converting an electrical signal to an optical signal to transmit it to an optical fiber; a lead frame for mounting the light emission element and having a through hole at a position determined with reference to a mounted position of the light emission element; and a receptacle having a protrusion portion inserted in the through hole to fix a position of the lead frame relatively, and a sleeve into which an end portion of the optical fiber is inserted to fix a position of the optical fiber relatively, the receptacle optically connecting the light emission element and the optical fiber.

1 . An optical transmission device comprising: 
 a photonic element converting an electrical signal received from an optical transmission path to an optical signal, or converting an optical signal received from the optical transmission path to an electrical signal;    a mounting board mounting the photonic element and having one of a hole and a notch at a position determined with reference to a mounted position of the photonic element; and    a coupling portion having a protrusion portion inserted in one of the hole and the notch to relatively fix a position of the mounting board, and an optical transmission path insertion port in which an end portion of the optical transmission path is inserted and which relatively fixes a position of the optical transmission path, the coupling portion optically coupling the photonic element and the optical transmission path.    
   
   
       2 . The optical transmission device according to  claim 1 , wherein one of the plurality of holes and notches are provided at positions almost symmetrical to one of a line passing through the photonic element and a point of the photonic element.  
   
   
       3 . The optical transmission device according to  claim 1 , wherein one of the holes and the notches are provided on a circumference of a circle with the photonic element of the mounting board at its center, and the protrusion portions are provided on a circumference of a circle with the optical transmission path of the coupling portion at its center.  
   
   
       4 . The optical transmission device according to  claim 1 , wherein coupling portions of the respective protrusion portions connecting with the coupling portions have an area larger than that of one of the holes and the notches, and a distance between the photonic element and the optical transmission path is determined by firmly contacting a peripheral portion of the mounting board around one of the hole and the notch with the connecting portion.  
   
   
       5 . The optical transmission device according to  claim 1 , wherein the protrusion portion has a caulking portion at its tip in order to relatively fix a position of the mounting board.  
   
   
       6 . The optical transmission device according to  claim 1 , wherein the mounting board has the holes or the notches in plural numbers.  
   
   
       7 . The optical transmission device according to  claim 1 , wherein a shape of at least one hole or notch among the holes or the notches is a polygonal shape having three corners or more or constitutes a part of the polygonal shape, and a cross-section shape of the protrusion portion inserted in the polygonal hole or notch is also a polygonal shape having three corners or more or constitutes a part of the polygonal shape when viewed from a protrusion direction thereof.  
   
   
       8 . The optical transmission device according to  claim 1 , wherein a shape of at least one hole or notch among the holes or the notches is an elliptic shape or constitutes a part of the elliptic shape, and a cross-section shape of the protrusion portion inserted in the elliptic hole or notch is also a elliptic shape or constitutes a part of the elliptic shape when viewed from a protrusion direction thereof.  
   
   
       9 . The optical transmission device according to  claim 1 , wherein the holes or the notches are provided on the mounting board so as to form an arc shape on a circumference of a circle with the photonic element at its center, and the protrusion portions are provided in the coupling portion so as to form an arc shape on a circumference of a circle with the optical transmission path at its center.  
   
   
       10 . The optical transmission device according to  claim 1 , wherein the coupling portion further includes a translucent lens provided so as to be positioned in front of an end face of the optical transmission path when the optical transmission path is inserted in the optical transmission path insertion port.  
   
   
       11 . The optical transmission device according to  claim 1 , wherein the coupling portion is made of a translucent resin.  
   
   
       12 . The optical transmission device according to  claim 1 , wherein the coupling portion is made of a conductive material.  
   
   
       13 . The optical transmission device according to  claim 1 , wherein a hollow space is provided between the photonic element and the coupling portion.  
   
   
       14 . The optical transmission device according to  claim 1 , wherein the mounting board is made of a ceramic.  
   
   
       15 . The optical transmission device according to  claim 1 , wherein the mounting board is made of a metal.  
   
   
       16 . The optical transmission device according to  claim 1 , wherein the mounting board and the coupling portion are a metal having an affinity for solder.  
   
   
       17 . The optical transmission device according to  claim 1 , wherein the coupling portion is screwed to the mounting board.  
   
   
       18 . The optical transmission device according to  claim 1 , wherein the protrusion portions are fixed to the mounting board by adhesive.  
   
   
       19 . The optical transmission device according to  claim 1 , wherein the protrusion portions have caulking portions having tips pointed approximately toward a direction of the light emission element.