JPS5818980A - Optoelectric transducer - Google Patents

Abstract

PURPOSE:To make a bar-type lens of a high price as needless, and to obtain an optoelectric transducer generating no disorder of the lens system by a method wherein a receptacle having a cylindrical cave is used when an electro-optically transducing element and optical fiber are to be coupled on the same axis, the element and fiber are positioned respectively at both the end thereof, and a spherical lens to be fixed to a fixed ring is provided between them. CONSTITUTION:The cylindrical cave 12 is provided in the receptacle 11, optical fiber is arranged at the open end on one side thereof, and the electro-optically transducing element 15 is arranged at the open end on another side respectively. Namely, the ring 17 to be fixed is inserted being positioned at nearly the center part in the cave 12 and is fixed, and the spherical lens 16, a plane washer 19, and a spring 13 are arranged in order toward the element 15 side. Then the electro-optically transducing element 15 having radiating fin 22 is screwed in the cave 12 using thread grooves 20 provided on the outside circumferential end face of the cave 12 and on the inside circumferential end face of the radiating fin of the element 15, and the end face is made to come in contact with the spring 13. Moreover a thread groove 21 is provided on the side opposite with the element 15, and a plug supporting fiber is inserted the same.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to a PL or light guide line in which light emitted from an electro-optical conversion element containing a light emitting diode or a laser diode is efficiently incident on a light guide line of an optical fiber. The present invention relates to a photoelectric converter that allows incident light to efficiently enter a photoelectric conversion element having a built-in photodiode or the like.

It is generally desired that a kernel seed converter be inexpensive and have high conversion efficiency, and typical ones are shown in the perspective view in Figure 1 and in Figure 2.
The structure is as shown in the sectional view of the main part in the figure. That is, an electric conversion element 2 is fixed inside a metal tag 1, and a rod-shaped lens 3 is arranged in front of it. Insert into the cavity of. The matched plug 9 is suppressed inside the cavity by a cap nut (not shown) that is screwed into the screw 6, and its end face is positioned at a position where it abuts against a small-diameter cylindrical end face 5 formed inside the cavity. Ru. On the other hand, the rod-shaped lens 5 is provided in the cavity and is held between the nine protrusions 4 and the front surface of the electro-optical conversion element 2, but the distance between the two is set to be large to allow for errors during manufacturing and assembly. Therefore, when an external force such as shock or vibration is applied to this transducer, the rod-shaped lens 3 will slide back and forth, albeit slightly. When the rod-shaped lens 3 slides from the position shown by the solid line to the position shown by the dotted line in FIG. Changes to As a result, the amount of light incident on the fiber 8 is reduced, resulting in a problem similar to that of a substantially reduced electro-optic conversion efficiency.

Furthermore, since conventional transducers use expensive rod-shaped lenses and metal receptacles, they also have the disadvantage of being expensive overall. Furthermore, since conventional converters do not have heat dissipation fins, the operating temperature of the light emitting elements increases and deterioration is likely to occur. Although the case of an electro-optical converter has been described above, a similar drawback exists in an opto-electric converter that makes the emitted light from a light guide line such as a 7-eyeper enter a photoelectric conversion element such as a photodiode. Note that, in this specification, an electro-optical conversion element and a photoelectric conversion element are collectively referred to as a photoelectric conversion collector, and an electro-optical converter and a photoelectric converter are collectively referred to as a photoelectric converter.

The present invention has been made in view of the above-mentioned conventional drawbacks, and its main purpose is to provide an inexpensive and highly efficient converter that does not use an expensive rod-shaped lens and is less prone to distortion of the lens system. It is in.

The details of the present invention will be explained below with reference to Examples.゛FIG. 6 is a cutaway perspective view of one embodiment of the electro-optical converter of the present invention,
The figure is a sectional view showing the state in which the electro-optic converter shown in the third figure is used. Referring to these figures, a cylindrical cavity 12 is formed inside the receptacle 11, and the cavity 12 has a first end 13 for coupling an electro-optical conversion element and a guide for a fiber or the like. a second end 14 into which one end of the optical path is inserted;
have. A fixing ring 17 is fixed with adhesive on the inner wall surface of the cavity 12 at the center thereof. On the right side of this fixing ring 17 (in the figure) is a ball lens (spherical lens) 16. Flat washers 19 and springs 18 are arranged in the same order. Radiation fins 22 fixed on the outer periphery
' is formed on the outer circumferential surface of the cavity 20 and on the inner circumferential surface of the radiation fin 22.
is connected to one end 13 of the cavity 12 by a threaded engagement.

A hemispherical lens is formed at the tip of the electro-optical conversion element 15, and this tip is connected to the spring 18 and the flat washer 1.
The ball lens 16 is pressed into contact with the fixing ring 17 via the lens 9.

In use, as shown in the fourth figure, the end of the optical fiber 23 held in place by the plug 24 is inserted into the cavity 12 from the end 14 of the cavity 12, and is placed on the inner circumferential surface of the cap nut 25 and By screwing into the threaded groove 21 formed on the outer thin surface of the cavity 12, the end surface of the plug 24 is pressed into contact with the end surface of the fixing ring 17. As a result, the end face of the 7-eyeper 23 is positioned and fixed at the same position as the end face of the fixing ring 17.

The light emitted from the light emitting element 26 in the electro-optical conversion element 15 is transmitted through a hemispherical lens and becomes a parallel light beam, and this parallel light beam is converged by the ball lens 16 and sent to an accurately positioned optical fiber. Focus on the central axis of the end face of 25.

Since the ball lens 16 is in pressure contact with the fixing ring 17 via the spring 1B, its position does not change even if vibration or impact is applied during use. The interval is always kept constant. Note that since the optical path from the electro-optical conversion element 15 to the single lens 16 is a parallel line, no problem occurs even if the distance between the two changes. In addition, the spring 18 can alleviate thermal stress caused by differences in thermal expansion coefficients between different materials and stress during initial assembly caused by dimensional errors during manufacturing. The receptacle 11 can be made of an inexpensive material such as plastic or resin that has a large expansion coefficient and low processing precision. Further, by using the radiation fins 22, the temperature of the light emitting element 26 can be prevented from rising, so that operation with a large current is possible, but the radiation fins 22 can be removed for light emitting elements for small current.

FIGS. 5 and 6 are a cutaway perspective view of another embodiment of the O photoelectric converter according to the present invention, and a sectional view showing its usage state.

The configuration of this photoelectric converter! ! Since most of the components are common to the components of the electro-optic converter of the present invention illustrated in FIGS. We will omit the duplicate explanation about. In this embodiment, the multiplication table electrical conversion element 27 housed in the cylindrical mount 28 is inserted into the threaded groove 20 formed on the inner circumferential surface of the mount 28 and the outer circumferential surface of the cavity 12. It is coupled to end 15 of cavity 12 .

The front surface of the photoelectric conversion element 27 made of a transparent body has a spring 18
Then, the ball lens 16 is pressed into contact with the fixing ring 17 via the flat washer 19. The tip of the optical fiber 25 is positioned and fixed by a fixing ring 17, and the light emitted from this tip passes through the ball lens 16 and becomes parallel light, which is formed in the photoelectric conversion element 27. The light is incident on the light receiving element 29. As in the case of the electro-optical converter described above, since the distance between the end face of the optical fiber 23 and the ball lens 16 is always kept constant, the light emitted from the optical fiber 23 efficiently enters the light receiving element 29. .

In the above description, the fixing ring 17 was used as a means for abutting and positioning the ball lens and one end of the light guide line, but as is clear from the gist of the present invention described above, the present invention is not necessarily limited to this. , a plurality of protrusions may be formed separately in the circumferential direction of the cavity, or a protrusion for fixing the girdle lens and a protrusion for fixing the light guide may be formed separately in the longitudinal direction of the cavity. may have been done.

As explained in detail above, the photoelectric converter of the present invention uses a ball lens, which is cheaper than a rod-shaped lens.
This has the advantage of being able to provide a much cheaper charging converter. Further, since the ball lens is pressed through a spring, there is an advantage that the optical system does not become distorted due to vibrations during use, and the conversion efficiency is less likely to deteriorate. Since various stresses are alleviated by the nine springs, the receptacle has the advantage that it can be constructed from inexpensive materials such as plastics and resins, although the processing accuracy and thermal stability are inferior to that of metal.

[Brief explanation of the drawing]

1 and 2 are respectively a perspective view and a sectional view of a main part of a conventional example, and FIGS. 5 and 4 are a cutaway perspective view and a state of use of an embodiment of the electro-optic converter of the present invention, respectively. The cross-sectional view, FIG. 5, and FIG. 6 are respectively a cutaway perspective view of an embodiment of the photoelectric converter of the present invention and a cross-sectional view showing its usage state. 11... Receptacle, 12-... Cavity, 15...
Electro-optical conversion element, 16--ball lens, 17--fixing ring (protrusion), 1B--spring, 23--optical fin (, 24-- plug, 29-- photo-electric conversion element). Patent applicant: 1 person from outside Fuji Electric Research Institute Co., Ltd. Patent attorney Gobe Tamamushi (5 others) Fig. 1 Fig. 2 Fig. 3 Fig. 4 Fig. 15 Fig. 6

Claims (1)

[Claims] 1. A receptacle having a linear cavity having a first end for coupling the photoelectric conversion element and a second end for inserting one end of the light guide line, the receptacle having a linear cavity formed in the cavity of the receptacle. one or more protrusions, the first protrusion within the cavity;
a ball lens disposed opposite to one of the protrusions on an end side of the cavity, and coupled to the first end of the cavity and coupled to the ball lens via a parallel beam and via a spring. a photoelectric conversion element for pressing the ball lens into contact with one of the projections, a row K, and pressing one end of the light guide line to be inserted at the second end of the cavity against one of the projections; A photoelectric converter characterized by comprising a means for contacting the photoelectric converter.