JP4288841B2 - Optical bus member manufacturing method and optical bus device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a method of manufacturing an optical bus member that is mounted on a wiring board and optically transmits data signals and the like by connecting devices such as a microprocessor and a memory, and an optical bus device including the optical bus member. .
[0002]
[Prior art]
  In an information processing apparatus such as a personal computer, the processing capability is improved by, for example, increasing the speed of a processor or increasing the capacity of a memory. In the information processing apparatus, data signals and the like are transmitted by a bus connecting each device, and the speed and capacity of the bus are increased. In the information processing apparatus, each of the above-described devices is mounted on a wiring board, and predetermined bus conductors are formed on the wiring board together with connection lands for connecting the devices with copper foil or the like.Signal transmission lineWas configured. The bus conductor transmits data signals between the devices by electrical signals.
[0003]
[Problems to be solved by the invention]
  In an information processing apparatus or the like, for example, a wide bus conductor is formed to increase data transmission speed and capacity. The bus conductor is to some extent by being wideUntilPossible to increase data transmission speedInHowever, there was a limit due to electrical resistance. The bus conductor reduces the mounting density of the wiring board due to its wide correspondence, and further reduces the mounting density in order to maintain a sufficient distance from each other and suppress crosstalk. The bus conductor generates unnecessary radiation to the outside due to the transmitted electrical signal, and it is necessary to take measures to shield it.
[0004]
  Therefore, the present invention includes a method of manufacturing an optical bus member that transmits data signals and the like at high speed between devices mounted on a wiring board and suppresses unwanted radiation to the outside and crosstalk, and the optical bus member. This has been proposed for the purpose of providing an optical bus device.
[0005]
[Means for Solving the Problems]
  An optical bus member manufacturing method according to the present invention that achieves the above-described object is provided by an optical bus.MaterialA forming step, an optical bus intermediate forming step, an optical signal input / output unit forming step, and a cutting step; Light busMaterialIn the molding process, it is molded from a light guide resin material having a first refractive index.Guides optical data signals insideA plurality of light guides and a first refractive indexSmaller thanThe first main surface of the light guide unit is exposed by a resin material having a second refractive index.NikoBoth orthogonal to the first main surface ofClose contact with the side and bottomMoldedByMaintain the spacing between each light guideAlong with preventing exposure of optical data signals to the outsideOptical bus consisting of a separatorMaterialIs molded. In the optical bus intermediate formation process, the optical busMaterialOptical bus molded by the molding processMaterialHeat rolling processGivingThus, a long optical bus intermediate having a predetermined width is formed. In the optical signal input / output part formation step, the first main surface of the light guide part formed in the optical bus intermediate,With a certain interval in the length directionSeparateAt least twoOptical data signalOptical signal input / outputTogetherForm. In the cutting step, the optical bus intermediate is cut to a predetermined length.
[0006]
  According to the method of manufacturing an optical bus member according to the present invention including the above steps, the separator portion is fixed on the wiring board by being positioned between the devices mounted on the wiring board and receiving and receiving the optical data signal. An optical signal input / output unit material having a plurality of optical-electrical conversion elements that are directly mounted on the device and respectively connected to the device faces the optical signal input / output unit opposite to the optical signal input / output unit, and the first light guide unit An optical bus member constituting an optical transmission path for optical data signals between devices is manufactured by being fixed to the wiring board across the main surface. According to the manufacturing method of the optical bus member, each light guide portion maintains the facing interval and the light shielding state by each separator portion, and suppresses crosstalk and unnecessary radiation to the outside such as a data signal transmitted between the devices. By manufacturing an optical bus member and using this optical bus member, it is possible to increase the operating frequency of the bus and improve the processing capacity of the system.
[0007]
  Moreover, the manufacturing method of the optical bus member concerning this invention is a separator member shaping | molding process, and a light guide member.CompletionForming process and end face processing processAnd a light guide member assembling step.The separator member molding processSecondWith a resin material having a refractive index ofA plurality of mounting grooves in the length direction opening on the main surface were formedA separator member is formed. Light guide memberCompletionThe molding process is the first2Refractive index1st bigger thanWith a light guide resin material having a refractive index ofEach of the optical signal inputs of at least two optical data signals is formed of a long member having substantially the same shape as the mounting groove of the separator member, and is separated from the first main surface by a predetermined interval in the length direction. Integrated output partA plurality of light guide members are formed.In the end face processing step, both end faces of the light guide member are formed as non-reflecting end faces, respectively. The light guide member assembling step includes exposing the light guide member to the assembly groove of the separator member, exposing the first main surface from the opening of the main surface, and partitioning the assembly groove and the bottom surface of the assembly groove By filling the wall with both side surfaces and the bottom surface in close contact with each other, the gap between the light guide members is maintained by the separator member, and the optical data signal is guided to the inside from both side surfaces and the bottom surface. To be prevented.
[0008]
  According to the method of manufacturing an optical bus member according to the present invention including the above steps, the separator portion is fixed on the wiring board by being positioned between the devices mounted on the wiring board and receiving and receiving the optical data signal. An optical signal input / output unit material having a plurality of optical-electrical conversion elements that are directly mounted on the device and respectively connected to the device faces the optical signal input / output unit opposite to the optical signal input / output unit, and the first light guide unit By fixing to the wiring board across the main surface, optical data signals between devicesAn optical bus member constituting the optical transmission line is manufactured.According to the manufacturing method of the optical bus member, each light guide portionMaterialIs the separator partMaterialBuilt-in grooveWithinAn optical bus member is manufactured that suppresses crosstalk and unnecessary radiation to the outside such as data signals that are held between the opposing spaces and shielded from light and transmitted between the devices. By using this optical bus member, the operating frequency of the bus Can improve the processing capacity of the system.
[0009]
  Furthermore, an optical bus device according to the present invention that achieves the above-described object includes an optical bus member comprising a plurality of light guide members and separator members, and a pair or a plurality of optical signals combined on the main surface of the optical bus member. It consists of an input / output unit. The light guide memberHaving a first refractive indexLong axis by the first light guide resin materialRod-shapedMolded into the body,While guiding the optical data signal insideLongitudinal direction on the first main surfaceWith a certain intervalAt least two apartOptical data signalOptical signal input / outputIntegrally formedThe The separator member is made of the first light guide resin material.A second having a refractive index less than the first refractive index;Resin materialForming a plurality of lengthwise built-in grooves that open in the main surface, exposing the light guide member in each of the built-in grooves, and exposing the first main surface from the opening.Both side surfaces orthogonal to the first main surfaceAnd the bottomByIn addition to preventing external exposure of optical data signalsLight guide memberAmongMaintain mutual distanceTo do.The optical signal input / output unitA holder member formed by a light guide resin material to have a size straddling a plurality of light guide members and formed with a plurality of photoelectric conversion element mounting holes opened at the bottom surface with an interval equal to the interval between the light guide members; A plurality of photoelectric conversion elements respectively connected to devices that are respectively mounted in the optical-electrical conversion element mounting holes of the holder member and mounted on the wiring board to exchange optical data signals.Become.
[0010]
  According to the optical bus device of the present invention configured as described above, on a wiring board on which devices such as a microprocessor and a memory are mounted.The optical bus member is mounted directly on the wiring board by fixing the separator member between the devices, and the optical signal input / output unit faces the optical signal input / output unit opposite to the optical signal input / output unit. An optical transmission path for optical data signals between devices is configured by being fixed to the wiring board across the optical bus member.. According to the optical bus device, a pair of or a plurality of optical signal input / output units are combined with the main surface of the optical bus member, so that optical data signals can be input / output at arbitrary positions.,eachThere is no need to deal with crosstalk of optical data signals transmitted between devices and suppression of unnecessary radiation to the outside, and the operating frequency of the bus is increased to improve the processing capacity of the system.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The optical bus device 1 shown in FIG. 1 as an embodiment forms a wiring board device 9 by being directly mounted on a wiring board 10 on which devices such as a microprocessor and a memory (not shown) are appropriately mounted. On the wiring board 10, an appropriate conductor portion 11 made of copper foil and a connecting land portion 12 are formed on the device mounting surface and the back surface by a known pattern forming technique. The wiring board device 9 is mounted on the wiring board 10 with mounting components electrically connected by the conductor part 11 and the land part 12.
[0012]
  The optical bus device 1 optically transmits a data signal by connecting predetermined devices on the wiring board 10.Optical signal transmission lineConfigure. The optical bus device 1 is assembled with an optical bus member 2 constituting an optical transmission path (optical bus) of an optical data signal and a predetermined distance in the length direction with respect to a side surface of the optical bus member 2. A pair of optical signal input / output units 5 (5) constituting the input / output unit for the transmitted optical data signalA5B). The optical bus device 1 is characterized in that an optical signal input / output unit 5 is combined with an appropriate position with respect to the optical bus member 2 to input / output an optical data signal. Of course, the optical bus device 1 may include a plurality of optical signal input / output units 5.
[0013]
  The optical bus member 2 includes a separator member 3 and four light guide members 4 (4) held by the separator member 3.A~ 4DAnd is manufactured by a method described in detail later. The optical bus member 2 constitutes a one-channel optical bus by transmitting an optical data signal to each light guide member 4 as described later. The optical bus member 2 has four light guide members 4.A~ 4DHowever, a single channel bus or a multi-channel bus may be configured by providing one or many light guide members 4.
[0014]
  The optical bus member 2 is formed of a synthetic resin material in which the separator member 3 and the light guide member 4 have different refractive indexes. The separator member 3 is formed of a resin material having mechanical rigidity such as a fluorine-based resin material, for example, and holds each light guide member 4 and the first main surface 4 of each light guide member 4.aIt has the effect of blocking or suppressing light exposure from the outer peripheral surface. The separator member 3 may improve the exposure suppressing effect on the light guide member 4 described above by mixing, for example, aluminum powder or the like into the resin material within a range not impairing the molding characteristics.
[0015]
  As shown in FIGS. 2 and 3, the separator member 3 has four built-in grooves 13 (13A-13D) Are recessed parallel to each other and at equal intervals. Each of the built-in grooves 13 is formed according to the number of the light guide members 4, and each of the built-in grooves 13 is formed of a long groove having a rectangular cross section and opened on both side surfaces in the longitudinal direction of the separator member 3. In the separator member 3, one light guide member 4 is incorporated in each of the built-in grooves 13, thereby each partition 14.(14A-14E)Thus, the light guide members 4 are held in parallel with each other at a predetermined interval. The separator member 3 includes a bottom surface and a partition wall of each built-in groove 1314Are joined to the three outer peripheral surfaces of each light guide member 4.
[0016]
  Each light guide member 4 is formed of a light guide resin material having a large light transmittance such as an acrylic resin or a polycarbonate resin used as a material of a plastic optical fiber. Each light guide member 4 is formed so that its outer shape is substantially equal to the opening shape of the built-in groove 13 of the separator member 3. That is, each light guide member 4 has a rectangular rod-like body in which the length dimension and the cross-sectional dimension are substantially equal to the length dimension and the cross-sectional dimension of each built-in groove 13. Each light guide member 4 is in a state of being incorporated in each of the built-in grooves 13, as shown in FIGS. 2 and 3.aConstitutes substantially the same surface as the main surface 3a of the separator member 3 and is exposed to the outside.
[0017]
  Each light guide member 4 has a characteristic that guides the optical data signal in the inside thereof while minimizing optical loss, and causes total reflection on the outer peripheral surface so that the optical data signal is not exposed to the outside. ing. Each light guide member 4 has a characteristic that the external light is totally reflected on the outer peripheral surface and is not guided to the inside. Each light guide member 4 is configured such that both longitudinal end faces 17 and 18 thereof are non-reflective end faces that prevent or suppress internal reflection of the optical data signal, as will be described in detail later. Each light guide member 4 controls the reflection of the optical data signal at both end faces 17 and 18 to suppress the reflected optical data signal, thereby detecting the optical data signal in each optical signal input / output unit 5 as will be described later. To be done with high accuracy.
[0018]
  Each light guide member 4 is configured as a non-reflective end surface by forming both end surfaces 17 and 18 on an inclined surface 24 that gradually decreases in thickness toward the tip as in the optical bus member 23 shown in FIG. Being done. Each light guide member 4 has an angle of the inclined surface 24 so that an optical data signal guided inside is gradually guided toward the tip without causing reflection at the both end faces 17 and 18. It is given a corner. Specifically, the Brewster angle is an angle determined by the refractive index of the resin material and air.
[0019]
  Each light guide member 4 is configured to form the non-reflective film layer 27 by applying a black paint to the end face 26 as in the optical bus member 25 shown in FIG. It may be. The light guide member 4 has a non-reflective film layer on the end face 26 for an optical data signal guided through the inside.layer27, the generation of the reflected light data signal is suppressed.
[0020]
  Each light guide member 4 includes a first main surface 4 as shown in FIG.aIn addition, the first optical signal input / output unit 15 and the second optical signal input / output unit 16 are formed apart from each other in the longitudinal direction. The first optical signal input / output unit 15 includes an input unit 15a and an output unit 15b that are configured by being subjected to a rough surface process separated from each other in the width direction. The second optical signal input / output unit 16 is also composed of an input unit 16a and an output unit 16b that are configured by being subjected to rough surface processing separated from each other in the width direction. The first optical signal input / output unit 15 and the second optical signal input / output unit 16 are formed such that one input unit 15a, 16a faces the other output unit 15b, 16b.
[0021]
  Each optical signal input / output unit 5 includes a holder member 6 whose details will be described later, and a plurality of sets of light-electrical conversion elements held by the holder member 6, that is, a light emitting element 7 and a light receiving element 8. . The holder member 6 is integrally formed of a synthetic resin material having a refractive index different from that of the light guide member 4, and has a length sufficient to cross the optical bus member 2 with respect to the width direction as shown in FIG. The height dimension is larger than the height dimension of 2. In the holder member 6, a fitting recess 19 having substantially the same width and height as the optical bus member 2 is formed at the bottom of the holder member 6 across the optical bus member 2. In the holder member 6, the bottom surfaces of both side portions sandwiching the fitting recess 19 constitute a bonding surface 20 for the wiring board 10.
[0022]
  As shown in FIG. 3, the holder member 6 is formed with the same number of element mounting holes 21 and 22 as the light guide member 4 located in the fitting recess 19. Each element mounting hole 21, 22 is formed as a stepped through hole penetrating the holder member 6 with the opening size on the bottom surface 6 a side being slightly smaller in diameter. As shown in the figure, each element mounting hole 21, 22 is connected to the light guide member 4 in the state where the holder member 6 is fitted onto the wiring board 10 by fitting the optical bus member 2 in the fitting recess 19. The optical signal input / output units 15 and 16 are respectively positioned corresponding to the input units 15a and 16a or the output units 15b and 16b.
[0023]
  The light emitting element 7 or the light receiving element 8 is fitted and attached to the holder member 6 in each of the element attaching holes 21 and 22. As shown in FIG. 3, each light emitting element 7 and light receiving element 8 has a light emitting surface 7 a or a light receiving surface 8 a that is the first main surface 4 of each light guide member 4.aAnd mounted in the element mounting holes 21 and 22. In this state, the holder member 6 has a bottom surface 6a with the first main surface 4 of each light guide member 4 as shown in FIG.aIt is closely attached to. Therefore, in the holder member 6, the bottom surface of each partition wall 14 is interposed between the input unit 15a and the output unit 15b of each optical signal input / output unit 15 or 16, or the light exposed from the input unit 16a and the output unit 16b. Block the data signal.
[0024]
  The optical signal input / output unit 5With the above configurationThe light emitting elements 7 and the light receiving elements 8 face the light emitting surfaces 7a or the light receiving surfaces 8a respectively to the input portions 15a and 16a or the output portions 15b and 16b of the optical signal input / output portions 15 and 16 of the light guide members 4, respectively. Will come to be. In each light emitting element 7 and light receiving element 8, lead wires 7b and 8b drawn from the back surface 6b side of the holder member 6 are connected to an input part or an output part of a predetermined device.
[0025]
  The first optical signal input / output unit 5 a is bonded onto the wiring board 10 so as to straddle the optical bus member 2 at a position corresponding to the first optical signal input / output unit 15. Similarly, the second optical signal input / output unit 5b is located at a position corresponding to the second optical signal input / output unit 16.Holder member 6 isIt is bonded onto the wiring board 10 so as to straddle the optical bus member 2. In the optical signal input / output unit 5, the optical data signal emitted from the light emitting element 7 of the first optical signal input / output unit 5a passes through the input unit 15a of the first optical signal input / output unit 15 to the inside of the light guide member 4. So that it is guided. The optical signal input / output unit 5 guides the optical data signal through the light guide member 4 to the second optical signal input / output unit 16 and exposes it from the output unit 16b to the outside. To detect.
[0026]
  As described above, the optical bus member 2 is configured by incorporating the light guide member 4 into the plurality of embedded grooves 13 formed in the separator member 3 as described above, but it is needless to say that the configuration is not limited thereto. For example, the optical bus member 29 shown in FIG. 6 is formed by alternately laminating a plurality of separator members 3 and light guide members 4 having substantially the same height. In the optical bus member 29, the light guide member 4 has the first main surface 4.aBoth sides 4 orthogonal tob4cThe first main surface 4 is shielded from light by the separator member 3.aAnd the bottom surface 28 is exposed to the outside.
[0027]
  Therefore, the optical bus member 29 is configured such that the reflection layer 30 is formed on the bottom surface 28 of the light guide member 4 to suppress the influence of ambient light. The optical bus member 29 has the above-described non-reflective film on the end face 26 of the light guide member 4.layer27 is formed. The optical bus member 29 may simultaneously process the formation of the reflective layer on the bottom surface 28 and the formation of the non-reflective film on the end surface 26 with respect to the light guide member 4.
[0028]
  Further, in the optical bus device 1 described above, the first main surface 4a of each light guide member 4 constituting the optical bus member 2 is subjected to a rough surface treatment so that an optical data signal is incident on the inside, and light is transmitted from the inside. The optical signal input / output units 15 and 16 for exposing the data signal are formed, but it is needless to say that the present invention is not limited to such a configuration. The optical bus device 1 includes the first main surface 4 of each light guide member 4.aOn the other hand, for example, each light emitting element 7 and light receiving element 8 of the optical signal input / output unit 5 may be directly attached by an adhesive having the same composition as the resin material.
[0029]
  In the optical bus device 1, a light guide unit in which a resin adhesive having the same characteristics as the light guide member 4 is in close contact with the light emitting surface 7 a of the light emitting element 7 or the light receiving surface 8 a of the light receiving element 8 and optically integrated is configured. To do. Accordingly, in the optical bus device 1, the resin adhesive layer guides the optical data signal from the inside, so that the light incident on the light guide member 4 from the light emitting element 7 and the light exposure on the light receiving element 8 from the light guide member 4. Will be done. The optical bus device 1 may be filled with the same resin adhesive between the light guide member 4 and the element mounting holes 21 and 22.
[0030]
  As described above, the optical bus member 2 is configured by assembling the respective light guide members 4 made of different members with respect to the respective incorporation grooves 13 of the separator member 3, but is not limited to this configuration. Of course. The optical bus member 2 may be molded integrally with the separator member 3 and the light guide member 4 by filling resin materials having different refractive indexes into the molding die as described in the manufacturing process described later. In this case, the optical bus member 2 employs a double molding method in which the molding material is alternately filled with the resin material of the separator member 3 and the resin material of the light guide member 4 and molded. In addition, the optical bus member 2 employs an insert molding method in which the separator member 3 is molded by the first molding process, and the light guide member 4 is integrally molded while the separator member 3 is held in the molding die. May be.
[0031]
  In the optical bus device 1 configured as described above, the optical bus member 2 is bonded to a predetermined position on the wiring board 10, and the optical signal input / output unit 5 also straddles the optical bus member 2. The wiring board device 9 is configured by being bonded to the top. That is, the optical bus member 2 is directly attached onto the wiring board 10 as shown in FIG. The optical bus member 2 is positioned corresponding to the first optical signal input / output unit 15 and the second optical signal input / output unit 16 of each light guide member 4, and the first optical signal input / output unit 5a and the second optical signal input / output unit 5a. The optical signal input / output unit 5b is combined.
[0032]
  Each optical signal input / output unit 5 is directly attached onto the wiring board 10 by applying an adhesive to the joint surface 20 of each holder member 6 and fitting the optical bus member 2 into the fitting recess 19. . In this state, each optical signal input / output unit 5 is connected to each element mounting hole 21, 22 with the input portion 15 a and output portion 15 b of the first optical signal input / output portion 15 or the second optical signal input / output portion 16. The input unit 16b and the output unit 16a are respectively exposed. In each optical signal input / output unit 5, the light emitting element 7 and the light receiving element 8 are mounted in the element mounting holes 21 and 22, respectively. In each optical signal input / output unit 5, each light emitting element 7 and light receiving element 8 are connected to a predetermined device by lead wires 7b and 8b to constitute an optical bus device 1.
[0033]
  When a data signal is supplied to the light emitting element 7 from a predetermined device, the first optical signal input / output unit 5a generates an optical data signal by driving the light emitting element 7 to generate an optical bus member from the light emitting surface 7a. The light is emitted to the second light guide member 4. In the optical bus device 1, the optical data signal is guided to the inside of the light guide member 4 from the input unit 15 a of the first optical signal input / output unit 15 that has been subjected to the roughening process facing the light emitting element 7. To do. In the optical bus device 1, the optical data signal is guided from the first optical signal input / output unit 15 to the second optical signal input / output unit 16 in the light guide member 4, and roughened. Exposure is performed from the output unit 16a.
[0034]
  In the optical bus device 1, a second optical signal input / output unit 5b is combined corresponding to the second optical signal input / output unit 16, and output by the light receiving element 8 of the second optical signal input / output unit 5b. An optical data signal exposed from the unit 16a is detected. In the optical bus device 1, an optical data signal detected by the light receiving element 8 is converted into a data signal and supplied to a predetermined device, whereby the data signal is transmitted between the devices.
[0035]
  In the optical bus device 1, transmission of data signals between the respective devices is performed by optical data signals, so that unnecessary radiation to other devices, conductors, or the outside of the wiring board device 9 can be suppressed. No need to deal with In the optical bus device 1, since the optical bus member 2 is isolated for each channel as described above, crosstalk of the transmitted optical data signal is suppressed, and a high-density bus is provided on the wiring board 10. Configure. In the optical bus device 1, by transmitting a data signal using an optical data signal, the operating frequency of the bus can be increased and the processing capacity of the system can be improved.
[0036]
  The manufacturing process of the optical bus member 2 will be described below with respect to an embodiment manufactured by the insert molding method shown in FIG. The manufacturing process of the optical bus member 2 shown as the embodiment is, for example, a long optical bus by an injection molding method or the like.MaterialThis optical bus molded 36MaterialAfter the optical bus intermediate body 38 having a predetermined width is manufactured by subjecting it to hot rolling, the optical bus member 2 is continuously manufactured by cutting it into a predetermined length.
[0037]
  In the manufacturing process of the optical bus member 2, the first resin supply step (s-1) for supplying the first material resin material 31 having the first refractive index into the molding die is the first step. As described above, for example, a fluorine resin material is used for the first material resin material 31. The manufacturing process of the optical bus member 2 is a separator that becomes the separator member 3 by a molding die.MaterialSeparator to mold 32MaterialThe molding step (s-2) is the second step. SeparatorMaterial32 has the same basic shape as that of the separator member 3 in which a plurality of built-in groove portions 34 divided by each partition 33 portion are provided on the main surface, but is formed with a large outer shape.
[0038]
  The manufacturing process of the optical bus member 2 is a molded separator.MaterialThe second resin supply step (s-3) for supplying the second resin material 35 having the second refractive index into the molding die while holding 32 in the cavity is referred to as a third step. As described above, for example, a transparent acrylic resin is used for the second resin material 35. The manufacturing process of the optical bus member 2 is a separator.MaterialA light guide part molding step (s-4) in which the second resin material 35 is filled in each of the 32 built-in groove parts 34 and the light guide part 37 is insert-molded is referred to as a fourth process. The manufacturing process of the optical bus member 2 is an optical bus having a large width by this light guide portion forming process.Material36 is formed.
[0039]
  The manufacturing process of the optical bus member 2 is an optical bus.MaterialA heating and rolling step (s-5) for forming a long optical bus intermediate body 38 having a predetermined width by subjecting it to a hot rolling process is referred to as a fifth step. Hot rolling process is an optical busMaterial36 is supplied between the pair of rolling rollers 39a and 39b, and the width (thickness) is rolled to the width of the optical bus member 2. The heating and rolling process is performed by the heater 40 using an optical bus.Material36 is supplied between the rolling rollers 39a and 39b in a state heated to a plastic temperature of the material resin, for example, 150 ° C. to 750 ° C. In the heating and rolling step, cooling means (not shown) is disposed downstream of the rolling rollers 39a and 39b, and the formed optical bus intermediate 38 is cooled to stabilize the shape.
[0040]
  The manufacturing process of the optical bus member 2 includes the rough surface forming step (s-6) in which the rough surface portions 41a and 41b are formed from the one main surface 38A side of the optical bus intermediate body 38 to the surface of the light guide portion at regular intervals. 6 steps are taken. In the rough surface forming step, for example, the rough surface portions 41a and 41b are formed by pressing a punch having a rough surface on the surface of each light guide portion in a slightly heated state. Each of the rough surface portions 41 a and 41 b constitutes the first optical signal input / output unit 15 and the second optical signal input / output unit 16 of the optical bus member 2.
[0041]
  In the manufacturing process of the optical bus member 2, the cutting process (s-7) in which the optical bus intermediate 38 is cut by the cutter 42 at a predetermined length in the width direction is defined as a seventh process. The manufacturing process of the optical bus member 2 is formed by cutting the optical bus member 2 by this cutting process. In the manufacturing process of the optical bus member 2, a post-processing process is performed on the optical bus member 2 to manufacture the wiring board device 9. Since the optical bus member 2 remains in a state where both end surfaces are cut by the cutter 42, the optical data signal is reflected at both end surfaces. Therefore, in the terminal surface processing step (s-8), the optical bus member 2 is subjected to the processing of making both end surfaces non-reflective end surfaces by applying black coating or the like as described above.
[0042]
  The optical bus member 2 is subjected to a substrate bonding step (s-9) for bonding onto the wiring substrate 10 after an adhesive is applied to the bottom surface of the separator portion. The optical bus member 2 includes a first optical signal input / output unit 5a and a first optical signal input / output unit 5b so as to straddle the first optical signal input / output unit 15 and the second optical signal input / output unit 16. Signal input / output unit that joins the circuit board to the wiring board 10MountingStep (s-10) is performed. The optical bus member 2 and the optical signal input / output unit 5 constitute an optical bus device 1, and the optical bus device 1 is joined onto the wiring substrate 10 to constitute a wiring board device 9.
[0043]
  Of course, the manufacturing method of the optical bus member 2 is not limited to the manufacturing process described above. The optical bus member 2 may be manufactured by, for example, molding the optical bus member 2 having a predetermined shape from the beginning with a molding die. In the manufacturing method of the optical bus member 2, the molding die is processed more precisely by molding the minute optical bus member 2, but the molding hot rolling step and the cutting step are not required.
[0044]
【The invention's effect】
  As described above in detail, according to the method for manufacturing an optical bus member according to the present invention, the optical bus member is mounted on a wiring board on which devices such as a microprocessor and a memory are mounted, and an optical signal input / output unit An optical bus member that optically transmits a data signal between devices is efficiently manufactured by assembling an electrical conversion element to constitute an optical bus device. According to the manufacturing method of the optical bus member, each light guide portionOr each light guide memberEach separator partOr each separator memberThe optical bus member that suppresses the crosstalk and unnecessary radiation to the outside of the optical data signal transmitted between the devices is maintained by maintaining the mutual facing interval and the light shielding state by the optical bus member. Increase operating frequency by usingTheA bus system is constructed in which the processing capacity of the system is improved by increasing the capacity and increasing the transmission speed.
[0045]
  The optical bus device according to the present invention is directly mounted on a wiring board on which devices such as a microprocessor and a memory are mounted, and optically transmits a data signal between the devices. According to the optical bus device, a pair or a plurality of optical signal input / output units are combined with the main surface of the optical bus member, thereby enabling input / output of optical data signals at arbitrary positions. According to the optical bus device, each light guide member is held between the facing distance and the light-shielded state by the separator member, thereby suppressing crosstalk of the optical data signal transmitted between the devices and unnecessary radiation to the outside. A bus system that does not need to be handled and that has an increased operating frequency to improve the processing capacity of the system by increasing capacity and increasing transmission speed will be constructed.
[Brief description of the drawings]
FIG. 1 is a perspective view of a principal part of a wiring board device provided with an optical bus device according to the present invention.
FIG. 2 is a partially cutaway perspective view of an optical bus member used in the optical bus device.
FIG. 3 is a longitudinal sectional view of a main part of the optical bus device.
FIG. 4 is a cross-sectional view of a principal part for explaining details of an end face structure of an optical bus member.
FIG. 5 is a perspective view of a main part for explaining another end surface structure of the optical bus member.
FIG. 6 is a cross-sectional perspective view of a main part for explaining another end surface structure of the optical bus member.
FIG. 7 is a manufacturing process diagram of an optical bus device.
[Explanation of symbols]
  1  Optical bus device, 2 Optical bus member, 3 Separator member, 4 Light guide member, 5 Optical signal input / output unit, 6 Holder member, 7 Light emitting element, 8 Light receiving element, 9 Wiring board device, 10 Wiring board, 13 Assembly groove , 14 Bulkhead, 15, 16 Optical signal input / output part, 17, 18 End face, 19 Fitting recess, 21, 22 Element mounting hole, 24 Brewster face, 27 Non-reflective filmlayer, 30 Reflective film, 31 First resin material, 32 SeparatorMaterial, 35 Second resin material, 36 Optical busMaterial, 38 Optical bus intermediate, 39 Rolling roller, 40 heater, 42 Cutter

Claims (13)

A plurality of light guide portions molded with a light guide resin material having a first refractive index and guiding an optical data signal therein, and a resin material having a second refractive index smaller than the first refractive index. The first main surface of the light guide unit is exposed and is formed in close contact with both side surfaces and the bottom surface orthogonal to the first main surface so as to maintain the interval between the light guide units and the optical data. An optical bus material molding process for molding an optical bus material comprising a separator portion for preventing exposure of the signal to the outside;
An optical bus intermediate forming step for forming a long optical bus intermediate having a predetermined width by subjecting the optical bus material formed by the optical bus material forming step to heat rolling.
At least two optical signal input / output units for the optical data signal spaced apart from each other at a predetermined interval in the length direction are formed on the first main surface of the light guide unit formed in the optical bus intermediate. An optical signal input / output unit forming step formed integrally;
Through the cutting step of cutting the optical bus intermediate to a predetermined length,
A plurality of optical components mounted on the wiring board and directly mounted on the wiring board by fixing the separator portion between the devices on which the optical data signals are transmitted and received, and respectively connected to the devices. An optical signal input / output unit material having an electrical conversion element is fixed to the wiring board across the first main surface of the light guide unit with the optical-electrical conversion element facing the opposing optical signal input / output unit. Thus, an optical bus member that forms an optical transmission path for the optical data signal between the devices is manufactured.   The method of manufacturing an optical bus member according to claim 1, wherein an end face processing step in which the cut end face of the light guide section is a non-reflecting end face is performed as a subsequent process of the cutting step. The optical bus material molding process
A separator material molding step for molding a separator material having a plurality of built-in grooves in which mutual intervals are maintained by the partition;
The light guide resin material is filled into each of the built-in grooves of the separator material, and a plurality of the light guide parts each of which exposes the first main surface from the opening of each of the built-in grooves is insert-molded. The method for manufacturing an optical bus member according to claim 1, comprising: an optical member forming step.   4. The method of manufacturing an optical bus member according to claim 3, wherein, in the separator material forming step, the separator material is formed from a resin material mixed with metal powder.   4. The method of manufacturing an optical bus member according to claim 3, wherein, in the separator material forming step, the separator material is formed of a resin material mixed with black powder made of carbon black. In the optical bus material molding step, a double molding method is used in which a light guide resin material of the light guide portion and a resin material of the separator portion are filled in a molding die and molded.
2. The method of manufacturing an optical bus member according to claim 1, wherein the optical bus material in which the light guide portions and the separator portions are alternately formed is formed. Separator member molding step of molding a separator member in which a plurality of lengthwise built-in grooves opened in the main surface is formed by a resin material having a second refractive index;
The light guide resin material having a first refractive index larger than the second refractive index is made of a long member substantially the same shape as the built-in groove of the separator member, and is long on each first main surface. A light guide member forming step of forming a plurality of light guide members integrally formed with optical signal input / output portions of at least two optical data signals spaced apart from each other at a predetermined interval with respect to the vertical direction;
An end face processing step for forming both end faces of the light guide member as non-reflective end faces,
Each light guide member is exposed to the built-in groove of the separator member, the first main surface is exposed from the opening of the main surface, and each partition wall dividing the built-in groove and a bottom wall of the built-in groove The both sides and bottom are in close contact with each other so that the gap between the light guide members is maintained by the separator member and the optical data signal guided to the inside from both sides and the bottom is sent to the outside. Through the light guide member assembling step to prevent exposure,
A plurality of optical components mounted on the wiring board and directly mounted on the wiring board by fixing the separator portion between the devices on which the optical data signals are transmitted and received, and respectively connected to the devices. An optical signal input / output unit material having an electrical conversion element is fixed to the wiring board across the first main surface of the light guide unit with the optical-electrical conversion element facing the opposing optical signal input / output unit. Thus, an optical bus member that forms an optical transmission path for the optical data signal between the devices is manufactured.   8. The method of manufacturing an optical bus member according to claim 7, wherein in the separator member forming step, the separator member is formed of a resin material mixed with metal powder.   8. The method of manufacturing an optical bus member according to claim 7, wherein, in the separator forming step, the separator member is formed of a resin material mixed with black powder. The first light guide resin material having the first refractive index is formed into a long-axis rod-shaped body, guides the optical data signal therein, and has a predetermined interval in the length direction on the first main surface. A plurality of light guide members integrally formed with at least two optical signal input / output portions of the optical data signal separated from each other, and a refractive index smaller than a first refractive index of the first light guide resin material A plurality of lengthwise built-in grooves that open to the main surface are formed by the second resin material, and the light guide member is exposed in each of the built-in grooves, and the first main surface is exposed from the opening. A separator member that prevents exposure of the optical data signal to the outside and maintains a mutual distance between the light guide members by closely combining both side surfaces and a bottom surface orthogonal to the first main surface. An optical bus member;
A holder formed with a light guide resin material so as to span a plurality of the light guide members and formed with a plurality of light-electric conversion element mounting holes that open to the bottom surface with an interval equal to the interval between the light guide members. A plurality of photoelectric conversion elements that are respectively connected to a member and a device that is mounted on the wiring board and receives and transmits the optical data signal; And a pair of or a plurality of optical signal input / output units.
The optical bus member is directly mounted on the wiring board by fixing the separator member between the devices and fixing the separator member, and the optical signal input / output unit faces the optical-electric conversion element. The optical data between the devices by being fixed to the wiring board across the optical bus member in a state where the input / output unit is opposed and the bottom surface is in close contact with the first main surface of the light guide member. An optical bus device comprising an optical transmission line for signals. 11. The optical bus device according to claim 10 , wherein the light guide member has both end surfaces formed as non-reflective end surfaces. The optical bus device according to claim 10 , wherein the separator member is formed of the second resin material mixed with metal powder. 11. The optical bus device according to claim 10 , wherein the separator member is formed of the second resin material mixed with black powder.

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