Hermetically sealing member having optical transmission means, optoelectronic apparatus, and optical transmission method

A hermetically sealing member with an optical transmission means transmits an optical signal economically and practically between the inside and the outside of a shielding member covering a printed-circuit board while sustaining the hermetically sealed state certainly. An optoelectronic device and an optical transmission method are also provided. A hermetically sealing member with an optical transmission means includes a gasket body fixed between a printed-circuit board and a sealing face of a shielding member, and a tape fiber formed integrally with the gasket body.

TECHNICAL FIELD

The present invention relates to a hermetically sealing member having optical transmission means, an optoelectronic apparatus, and an optical transmission method. In particular, the present invention relates to a hermetically sealing member having optical transmission means, an optoelectronic apparatus, and an optical transmission method which make it possible for optical elements mounted on a printed-circuit board to transmit optical signals between inside and outside of a shielding member while maintaining the hermetically sealed state of a coolant established by the shielding member.

BACKGROUND ART

Large scale integrated circuit may also be referred to as “LSI”) modules generate a large amount of heat when reduced in size because the degree of integration and the operation speed are dramatically increased. In general, therefore, the LSI modules are cooled by using the forced cooling means.

As the forced cooling means, various cooling means such as the air cooling system and the water cooling system have been developed. As cooling means which is the most excellent in cooling capability among those forced cooling means, a liquid cooling system in which LSI modules are immersed in a liquid coolant and the liquid coolant is circulated is developed.

A technique of a heat generation element mounting semiconductor apparatus having a cooling liquid hermetically sealing case which serves as a shielding member mounted on a printed-circuit board is disclosed in, for example, Patent Document 1 (Japanese Patent Publication No. 3424717). In this heat generating elements mounting semiconductor apparatus, heat generating elements (for example, LSI modules) are accommodated in a cooling liquid hermetically sealing case, and the cooling liquid is circulated along a predetermined flow path by a partition wall provided in the cooling liquid hermetically sealing case to cool the heat generating elements.

According to this technique, efficient cooling can be conducted even if the mounting density of heat generating elements is increased.

As the capacity of data transmission becomes large, optical transmission systems are being researched, developed, and applied to practical use. In the above-described optical transmission system, optical elements (for example, light emitting elements and light receiving elements) which convert optical signals and electric signals to each other and optical transmission means (for example, optical waveguides and optical cables) which transmit optical signals are used. The optical elements are different from conventional electronic components which handle only electric signals. In other words, each of the optical elements includes external connection terminals to input and output electric signals and external optical signal connection means to input and output optical signals.

Various techniques for embedding optical transmission means in a substrate on which optical elements and electronic components are mounted mixedly are being developed.

A technique of a mixed optical and electrical wiring board having an optical fiber embedded layer obtained by embedding an optical fiber in a partial layer of an electric wiring board having an electric circuit mounted thereon is disclosed, for example, in Patent Document 2(Japanese Patent Application Laid-open No. 10-126018). A technique of an optical waveguide formed in a substrate is disclosed in Patent Document 3(Japanese Patent Application Laid-open No. 7-114049) and Patent Document 4(Japanese Patent Application Laid-open No. 6-27334). According to these techniques, optical transmission means such as optical fibers and optical waveguides can be embedded in a printed-circuit board.

A printed-circuit board having optical transmission means embedded therein proposed in the conventional art will now be described with reference to the drawing.

FIGS. 5(a) and5(b) are schematic diagrams showing a printed-circuit board having optical transmission means embedded therein proposed according to a conventional art.FIG. 5(a) is a perspective view of a printed-circuit board having optical cables embedded therein, andFIG. 5(b) is a perspective view of a printed-circuit board having optical waveguides embedded therein.

InFIG. 5(a), an LSI module91, a connector98and an optical element92aare mounted on a printed-circuit board90a. In addition, a (flat) land93described in Patent Document 1 is formed so as to correspond to a seal face shape of a shield case (not illustrated). An optical cable95connected at each end to an optical connector94is embedded in the printed-circuit board90a. One end of the optical cable95is arranged from inside of the annular land93to the optical element92a. The other end of the optical cable95is arranged from outside of the annular land93to the external of the printed-circuit board90a.

Although not illustrated, in the printed-circuit board90a, a shield case serving as a shielding member to be mounted on the printed-circuit board is attached onto the land93via an O ring. The optical connector94located inside the land93is connected to the optical element92a.

Because of this arrangement, a liquid coolant (for example, FLUORINERT (registered trademark of the 3M Corporation) which is an inactive liquid) flows in the hermetically sealed shield case. As a result, the LSI module91is cooled effectively. Optical signals can be transmitted between the inside and the outside of the shield case via the optical cable95embedded in the printed-circuit board90a.

InFIG. 5(b), a printed-circuit board90bdiffers from the printed-circuit board90ain that an optical waveguide96is embedded instead of the optical cable95. Other structures of the printed-circuit board90bare substantially the same as those of the printed-circuit board90a.

One end of the optical waveguide96is located inside the annular land93and the other end of the optical waveguide96is located outside the land93. One end of the optical waveguide96is connected to an optical element92bvia an opening (not illustrated) formed in the printed-circuit board90b. The other end of the optical waveguide96is connected to an optical element (not illustrated) via an opening97. Because of this arrangement, optical signals can be transmitted between the inside and outside of the shield case via the optical waveguide96embedded in the printed-circuit board90b.

DISCLOSURE OF THE INVENTION

Problems to be Solved by the Invention

In the conventional printed-circuit boards90aand90b, however, the optical cable95or the optical waveguide96is embedded within the printed-circuit board in which circuit wires serving as signal paths of the electric system are formed. Although the seal face of the shielding member can be hermetically sealed by the O ring which serves as the hermetically sealing member described in Patent Document 1, there is a problem that the manufacturing costs of the printed-circuit boards90aand90bbecome high. In applying to practical use, there is a fatal problem that, even if a trouble occurs in the embedded optical cable95or optical waveguide96, repair cannot be conducted.

Furthermore, the printed-circuit board90bhas a problem that the optical waveguide96needs to be connected to the light emitting end face and the light receiving end face of the optical element92baccurately, and consequently the assembly precision must be improved.

In order to solve the problems, an object of the present invention is to provide a hermetically sealing member having optical transmission means, an optoelectronic apparatus, and an optical transmission method which make it possible to transmit optical signals between inside and outside of the shielding member economically and practically while certainly maintaining the hermetically sealed state achieved by the shielding member mounted on the printed-circuit board.

Means for Solving the Problems

In order to achieve this object, a hermetically sealing member of the present invention having optical transmission means has a configuration including a hermetically sealing member attached to seal faces of a printed-circuit board having optical elements mounted thereon and a shielding member which shields at least a part of components mounted on the printed-circuit board, and optical transmission means formed integrally with the hermetically sealing member to transmit optical signals between inside and outside of the shielding member.

According to this configuration, a part of the optical transmission means depressed by the seal face of the shielding member functions as the hermetically sealing member. As a result, the optical signals can be transmitted between the inside and outside of the shielding member while securely maintaining the hermetically sealed state established by the shielding member.

Preferably, optical connectors are connected to both ends of the optical transmission means.

By doing so, the optical connectors can be connected to the optical elements. As a result, the optical elements can be connected to the optical transmission means easily.

Preferably, the hermetically sealing member is a sheet containing at least one of resin and rubber with a shape corresponding to the shielding member.

Because of this arrangement, the hermetically sealing member functions as a gasket. As a result, the seal performance with the optical transmission means formed integrally with the hermetically sealing member can be improved.

Preferably, a projection part formed of the rubber or a seal layer formed of the rubber is provided on at least one of a top face and a bottom face of the hermetically sealing member.

By doing so, the projection part or the seal layer functions as an O ring or a gasket formed of rubber. As a result, the seal performance of the hermetically sealing member can be further improved.

In order to achieve the object, an optoelectronic apparatus according to the present invention has a configuration including a printed-circuit board on which optical elements are mounted, a shielding member which shields the printed-circuit board and at least a part of components mounted-on the printed-circuit board, and the hermetically sealing member having optical transmission means described above.

In this way, the present invention is effective as an optoelectronic apparatus as well, and optical signals can be transmitted between the inside and outside of the shielding member while maintaining the hermetically sealed state given by the shielding member.

Preferably, a coolant which cools electronic components mounted on the printed-circuit board is supplied to space between the shielding member and the printed-circuit board, and the hermetically sealing member hermetically seals the coolant.

By doing so, forced cooling using the coolant can be conducted. As a result, electronic components mounted on the printed-circuit board can be cooled efficiently.

Preferably, unevenness which forms a flow path of the coolant is provided on the shielding member.

Because of this arrangement, the flow velocity and flow quantity of the coolant can be set freely. As a result, cooling according to each electronic component can be conducted, and effective cooling can be achieved.

Preferably, a retaining part which retains the optical transmission means is provided on the shielding member.

Because of this arrangement, the optical transmission means can be securely supported by the retaining part. Even if the coolant flow becomes fast, therefore, a trouble that the optical transmission means is damaged by the coolant can be prevented.

In order to achieve the object, an optical transmission method according to the present invention is an optical transmission method used for optical elements which are covered by a shielding member, which are cooled by a coolant supplied to space between the shielding member and the printed-circuit board, and which are mounted on the printed-circuit board to transmit optical signals to outside of the shielding member and receive optical signals from outside of the shielding member, wherein the optical signals are transmitted or received via optical transmission means formed integrally with a hermetically sealing member attached to seal faces of the printed-circuit board and the shielding member.

In this way, the present invention is effective as an optical transmission method as well, and optical signals can be transmitted between the inside and outside of the shielding member while maintaining the hermetically sealed state given by the shielding member.

Effects of the Invention

According to the hermetically sealing member having optical transmission means, an optoelectronic apparatus, and an optical transmission method of the present invention, optical signals can be transmitted between the inside and outside of the shielding member economically and practically while securely maintaining the hermetically sealed state established by the shielding member. Furthermore, it is possible to cool electronic components mounted on the printed-circuit board with a liquid effectively and transmit optical signals.

BEST MODE FOR CARRYING OUT THE INVENTION

[Hermetically Sealing Member Having Optical Transmission Means]

FIGS. 1(a)-1(c) are schematic diagrams for explaining a structure of a hermetically sealing member having optical transmission means according to an embodiment of the present invention, in whichFIG. 1(a) is a plan view,FIG. 1(b) is an expanded sectional view seen along a line A-A, andFIG. 1(c) is an expanded sectional view seen along a line B-B.

FIG. 2is a schematic perspective view for explaining a structure of a hermetically sealing member having optical transmission means according to an embodiment of the present invention.

InFIGS. 1(a)-1(c) and2, a hermetically sealing member having optical transmission means1(may also be abbreviated to hermetically sealing member1) includes a gasket main body11attached between seal faces of a printed-circuit board3and a shielding member4and a tape fiber2formed integrally with the gasket main body11.

In the present embodiment, the shielded substance is the printed-circuit board3, but the shielded substance is not restricted to the printed-circuit board3. The gasket main body11is used as the hermetically sealing member. The hermetically sealing member in the present invention refers to a substance used to prevent leak when all of the components are properly assembled. Therefore, the gasket, O ring or packing is included in the hermetically sealing member in the present invention.

The gasket main body11is a sheet which is formed of polyimide, which has a rectangular fringe shape, and is uniform in thickness. In the gasket main body11, fan-shaped and semicircular gasket parts14for screw holes are formed in corners of the rectangle, a center part of an upper side, a center part of a right side, a center part of a left side, and middle parts between the tape fibers2on a bottom side (a total of twelve places). A screw hole13is formed in the center of each of the gasket parts14in order to pass a screw41there through. Each of the gasket parts14for screw hole hermetically seals a screw hole (or a female screw) of the shielding member4.

In the gasket main body11, a flow path gasket part12which has a straight line shape and joins the central part of the left side to the center part of the rectangle (the gasket main body11) is formed. A circle-shaped screw hole gasket part15is formed at a tip of the flow path gasket part12. In addition, a screw hole13is formed in the center of the screw hole gasket part15to pass a screw41there through.

In the present embodiment, polyimide is used as the material of the gasket main body11. However, the material of the gasket main body11is not limited to polyimide. For example, another resin other than polyimide or rubber such as nitrile rubber (NBR) may be used.

The tape fibers2are formed integrally with the gasket main body11so as to cross the bottom side of the gasket main body11. In other words, the tape fiber2is formed by molding a plurality of optical fibers22integrally with the gasket main body11by using polyimide. One end of the tape fiber2is located outside the gasket main body11, whereas the other end of the tape fiber2is located inside the gasket main body11. The tape fiber2takes the shape of a long and slender rectangle in section, and has the same thickness as that of the gasket main body11inclusive of parts crossing the gasket main body11. In the present embodiment, six tape fibers2are disposed at equal intervals.

In the present embodiment, the tape fiber2including the optical fibers22is used as the optical transmission means. However, the optical transmission means is not restricted to the tape fiber2. For example, an optical waveguide sheet including optical waveguides may be used as the optical transmission means.

The tape fiber2is connected at each end to an optical connector21. This facilitates connection to the optical elements92such as light emitting elements and light receiving elements.

It is desirable that the optical connectors21are connected so as to hermetically seal the inside of the optical transmission means (for example, a gap between the optical waveguide and a covering member which covers the optical waveguide, or a gap between the optical fiber22and a covering member which covers the optical fiber22). Even if the optical transmission means is an optical cable having a twisted wire structure of optical fibers, connecting the optical connectors21so as to hermetically seal the inside makes it possible to more certainly prevent a trouble that the inside and outside of the shielding member4communicate with each other via gaps between twisted wires.

In the present embodiment, the tape fiber2having polyimide as a covering member is formed by molding the optical fibers22with polyimide. However, this is not restrictive. For example, as shown inFIG. 3(c), when forming the gasket main body11by using a commercially available tape fiber2ain which the optical fibers22are previously covered by a covering member23, the gasket main body11and the covering member23may be joined to each other integrally. Since the material of the gasket main body11is polyimide, the seal performance between the gasket main body11and the covering member23in the tape fiber2aformed integrally with the gasket main body11can be improved at this time.

According to the hermetically sealing member1having optical transmission means, optical signals can be transmitted between the inside and the outside of the shielding member4while maintaining the hermetically sealed state given by the shielding member4.

In the hermetically sealing member1, the material of the gasket main body11is one kind, i.e., polyimide. However, this is not restrictive.

An application example of the hermetically sealing member1having optical transmission means will now be described with referring to the drawings.

FIGS. 3(a)-3(c) are schematic diagrams for explaining a structure of a hermetically sealing member having optical transmission means according to an application example of the present invention, in whichFIG. 3(a) is a plan view,FIG. 3(b) is an expanded sectional view seen along a line C-C, andFIG. 3(c) is an expanded sectional view seen along a line D-D.

A hermetically sealing member1ahaving optical transmission means shown inFIGS. 3(a)-3(c) differs from the hermetically sealing member1according to the above-described embodiment in that a projection part111formed of nitrile rubber is provided on a top face of a polyimide layer of the gasket main body11and a seal layer112formed of nitrile rubber is provided on a bottom face of the gasket main body11.

Other configurations are made nearly the same as those of the above-described embodiment. Therefore, the same configuration parts as those inFIGS. 1(a)-1(c) are denoted by the same reference numbers inFIGS. 3(a)-3(c), and detailed description of them will be omitted.

The hermetically sealing member1ahas a structure in which the projection part111and the seal layer112are connected to the top face and the bottom face of the gasket main body11. The seal layer112comes in contact with the land of the printed-circuit board3thereby achieving excellent sealing. The projection part111is accommodated in a groove40awhich is formed in a seal face of the shielding member4ain a state in which the projection part111is pressed. The projection part111thus functions as the O ring thereby achieving excellent hermetic sealing.

Accordingly, the seal performance can be further improved by using the hermetically sealing member1ahaving optical transmission means.

In the hermetically sealing member1a, the projection part111and the seal layer112are formed integrally with the gasket main body11. However, the hermetically sealing member1ais not limited to this structure. For example, a structure obtained by superposing the projection part111and the seal layer112which are separately formed, on and under the gasket main body11may be used.

FIGS. 4(a)-4(b) are schematic diagrams for explaining a structure of an optoelectronic apparatus according to an embodiment of the present invention, in whichFIG. 4(a) is a plan view, andFIG. 4(b) is a sectional view seen along a line E-E.

InFIGS. 4(a)-4(b), an optoelectronic apparatus10includes the printed-circuit board3, the shielding member4, the hermetically sealing member1having optical transmission means according to the above-described embodiment, and a coolant5.

The printed-circuit board3according to the present embodiment is a double side mounting board. The hermetically sealing member1and the shielding member4are disposed on both sides of the printed-circuit board3.

Lands (not illustrated) having a shape corresponding to the gasket main body11are formed at positions (of both sides) of the printed-circuit board3which come in contact with the gasket main body11. In addition, through holes (not illustrated) that allow the screws41for fixing the shielding member4to pass through are formed at a plurality of locations of the printed-circuit board3. The gasket main body11comes in contact with the lands to conduct sealing.

Six optical elements92per side are mounted on the printed-circuit board3at positions which are located inside the land and which correspond to the optical connectors21located inside the hermetically sealing member1. A total of eighteen LSI modules91are mounted in six rows by three columns so as to correspond to the optical elements92. In addition, three connectors98are mounted in a peripheral part of the printed-circuit board3located outside the land and in the opposite side to the optical elements92. By the way, the mounting positions of the optical elements92, the LSI modules91and the connectors98are not limited to the above-described positions.

The shielding member4is a rectangular flat plate made of aluminum. The shielding member4has a concave part43to accommodate the optical elements92and the LSI modules91mounted on the printed-circuit board3. The flat plate has an external shape which coincides with an external shape of the gasket main body11. A contour of the concave part43has a shape identical to the inside shape of the gasket main body11. In other words, the shielding member4includes side walls44corresponding to the gasket main, body11and the screw hole gasket part14, and a partition wall47corresponding to the flow path gasket part12and the screw hole gasket part15similar to the example ofFIG. 3(a). As for the shielding member4, end faces (seal faces) of the side walls44and the partition wall47come in contact with the gasket main body11to conduct sealing.

As for the shielding member4located above the printed-circuit board3, a screw hole (not illustrated) through which a screw41passes is formed in a position corresponding to a screw hole13of the gasket main body11.

On the other hand, as for the shielding member4located below the printed-circuit board3, a female screw (not illustrated) into which a screw41is screwed is formed in a position corresponding to a screw hole13of the gasket main body11.

As for the shielding member4, pipes46are connected to vicinities of both ends of the side wall44having the partition wall47via joints45. A coolant is supplied from one pipe46, and the supplied coolant is discharged from the other pipe46.

As for the shielding member4, a flow path which is roughly U-shaped is formed because of the partition wall47. In other words, the coolant5supplied from one of the pipe46goes nearly straight in one of insides of the shielding member4partitioned by the partition wall47, then performs U-turn, goes nearly straight so as to return in the other of the insides of the shielding member4partitioned by the partition wall47, and discharged from the other pipe46.

Although not illustrated, preferably unevenness may be provided on the shielding member4to form the flow path of the coolant5with higher precision. In other words, the LSI modules91which generate a large amount of heat can be deprived of a large amount of heat by generating the unevenness so as to expose the LSI modules91to a fast flow. By doing so, cooling according to each LSI module91can be conducted and effective cooling can be conducted.

Since the tape fiber2located inside the gasket main body11is exposed to the flow of the coolant5, it is desirable to provide a retaining part (not illustrated) in the shielding member4to retain the tape fiber2so as to press down the tape fiber2. By doing so, it is possible to prevent a trouble that the tape fiber2will be damaged by the coolant5even if the flow of the coolant5becomes fast.

As for the coolant5, a liquid coolant (for example, FLUORINERT (registered trademark of the 3M Corporation) which is a non-conductive and inactive liquid) is used to effectively cool the LSI modules91. By the way, the coolant5is not restricted to the above-described FLUORINERT.

In the present embodiment, the object to be sealed by the shielding member4and the hermetically sealing member1having optical transmission means is the coolant5which flows through the inside of the shielding member4. However, the object is not restricted to the coolant5. In other words, the optoelectronic apparatus10is also effective to prevent gas or liquid from leaking out from the inside of the shielding member4to the external or to prevent gas or liquid from intruding from the external of the shielding member4to the inside.

An assembly procedure and operation of the optoelectronic apparatus10having the above-described configuration will now be described.

First, the printed-circuit board3is turned over, and the hermetically sealing member1having optical transmission means is placed on the back surface of the printed-circuit board3so as to position the gasket main body11on the land. Subsequently, the optical connectors21are connected to the optical elements92, and the shielding member4having female screws formed thereon is placed on the gasket main body11. Subsequently, the printed-circuit board3, the hermetically sealing member1and the shielding member4which are superposed are turned over again while maintaining the superposed state, so that the front surface of the printed-circuit board3faces upward. Although not illustrated, it is desirable to form positioning holes in a plurality of places of the printed-circuit board3and the gasket main body11and insert positioning into the positioning holes on the shielding member4. As a result, positioning of the hermetically sealing member1and the shielding member4can be conducted with high precision and with ease, and position misalignment can be prevented when it is turned over.

Subsequently, the hermetically sealing member1having optical transmission means is placed on the front surface of the printed-circuit board3so as to position the gasket main body11on the land. Subsequently, the optical connectors21are connected to the optical elements92. In addition, the shielding member4having screw holes is placed on the gasket main body11, and screws41are inserted into the screw holes and fastened. As a result, the shielding member4, the hermetically sealing member1, the printed-circuit board3, the hermetically sealing member1and the shielding member4are connected to one another, and assembling of the optoelectronic apparatus10is completed. Consequently, the gasket main body11is sandwiched between the land of the printed-circuit board3and the seal face of the shielding member4and the gasket main body11adheres tightly to the land and the seal face. As a result, the gasket main body11hermetically seals the inside of the shielding member4.

In the optoelectronic apparatus10, the coolant5is supplied from one of the pipes46, flows along a flow path formed by the shielding member4, and discharged from the other of the pipes46. Power and electric signals are input via the connectors98. Subsequently, power for activating the optoelectronic apparatus10is input from the connector98, optical signals are input from the optical connectors21exposed to the external, and a large amount of signals are input to the LSI modules91via the tape fiber2, inside optical connectors21, and the optical elements92. And the LSI modules91are cooled by the coolant5, and a large amount of signals are processed without being overheated. The LSI modules91output signals obtained by conducting the processing, as optical signals from the optical connectors21exposed to the external via the optical elements92, the inside optical connectors21, and the tape fibers2.

Even if, for example, breakage occurs in the tape fiber2or the optical connector21is damaged during operation, the optoelectronic apparatus10can be disassembled easily by tracing back the assembling procedure and the faulty hermetically sealing member1having optical transmission means can be replaced with a normal hermetically sealing member1having optical transmission means. Therefore, the trouble such as the utility impairment is prevented.

According to the optoelectronic apparatus10in the present embodiment, the LSI modules91and the optical elements92mounted on the printed-circuit board3can be cooled with high efficiency and precision. Furthermore, optical signals can be transmitted between the inside and the outside of the shielding member4while maintaining the hermetically sealed state given by the shielding member4.

The optoelectronic apparatus10is effective as an electronic apparatus of a liquid cooling scheme which conducts processing on optical signals. The optoelectronic apparatus10is also extremely effective as a test apparatus for testing the printed-circuit board3on which the LSI modules91and the optical elements92to be tested are mounted. The reason is as follows: the optoelectronic apparatus10has a structure which can be assembled and disassembled easily; and even if the tape fiber2or the optical connector21is damaged, the hermetically sealing member1having optical transmission means can be exchanged without scrapping the printed-circuit board3.

The present invention is effective as an optical transmission method as well. An optical transmission method according to an embodiment will now be described.

The optical transmission method according to the present embodiment is a process operated in the optoelectronic apparatus10. This optical transmission method is used when the optical elements92mounted on the printed-circuit board3which are covered by the shielding member4and which are cooled by the coolant5supplied to the space between the shielding member4and the printed-circuit board3transmit optical signals to the outside of the shielding member4or receive optical signals from the outside of the shielding member4. Furthermore, this optical transmission method is a method by which optical signals are transmitted or received via the tape fibers2formed integrally with the hermetically sealing member1having optical transmission means attached to seal faces of the printed-circuit board3and the shielding member4.

According to the optical transmission method in the present embodiment, optical signals can be thus transmitted between the inside and the outside of the shielding member4while maintaining the hermetically sealed state established by the shielding member4.

Heretofore, the hermetically sealing member having optical transmission means, the optoelectronic apparatus and the optical transmission method according to the present invention have been described with reference to the preferred embodiments. However, it is a matter of course that the hermetically sealing member having optical transmission means, the optoelectronic apparatus and the optical transmission method according to the present invention are not limited to the above-described embodiments, but various changes can be made without departing from the scope of the present invention.

For example, the optoelectronic apparatus10has a structure in which double side mounting is conducted on the printed-circuit board3. However, the present invention is not limited to this particular structure. For example, the optoelectronic apparatus10is effective to a printed-circuit board3of single side mounting as well.

INDUSTRIAL APPLICABILITY

As heretofore described, the hermetically sealing member having optical transmission means, the optoelectronic apparatus and the optical transmission method according to the present invention are not restricted to the case where the coolant is sealed, but they can be applied widely to various uses in which optical signals are transmitted through a sealed space.