JP2007140369A - Optical composite printed circuit board - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical compound printed board that reduces time and labor for mounting optical wiring on a printed board and facilitates the process, that achieves longer service life of a printed board and suppresses cutting in the optical wiring or decrease in the service life of components assembled in the printed board. <P>SOLUTION: The optical compound printed board 1A is obtained by locally mounting the optical wiring 3 at one or more positions in the longitudinal direction by a mounting means with an adhesive material 4 along the printed board 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical composite printed circuit board in which an optical wiring used in the field of optical communication or the like is mounted on a printed circuit board.

  As a substrate with a structure combining optical wiring and electrical wiring used for optical communication, a method of covering an optical fiber as an optical wiring from above with a resin sheet or resin, a method of embedding in a resin layer, adhesive fixing The method to do is common.

For example, it has an optical fiber core wire embedded on the surface of a substrate having electrical signal wiring via a resin layer, and an optical component mounted on the substrate, and is raised from the resin layer of the optical fiber core wire. There has been proposed an electric / optical mixed board in which a portion is fixed to the optical component (Patent Document 1).
In addition, a printed wiring board in which an optical fiber or an optical waveguide capable of transmitting an optical signal is embedded in an insulating board in the printed wiring board has been proposed (Patent Document 2).
An optical fiber fixing groove for accommodating the optical fiber is formed in a resin layer formed on the optical fiber mounting surface of the substrate, and the opening of the fixing groove is narrower than the inside of the fixing groove. A printed wiring board for mounting an optical fiber in which an overhang portion is formed has been proposed (Patent Document 3).
Further, an optoelectric composite substrate in which an optical wiring is formed in an interlayer portion of a wiring substrate made of a multilayer copper clad laminated substrate has been proposed (Patent Document 4).
Further, the substrate has an adhesive layer formed on the substrate, an optical fiber laid on the adhesive layer, an adhesive layer protecting the surface of the optical fiber, and a film layer thereon. And the wiring board which does not have the said adhesive bond layer and the said film layer, and has the predetermined location where the said optical fiber is exposed (patent document 5).

However, in the case of the technique described in the above document, in Patent Document 1, Patent Document 3, and Patent Document 5, the resin layer must be processed into a complicated shape, and also when the resin layer is pasted, the pasting position is set. Care must be taken, which is very disadvantageous in the manufacturing process.
Further, in Patent Document 2, a connector is provided on the side surface of the optical composite printed circuit board, and the optical fiber is routed to the optical component on the upper part of the board to which the optical fiber is connected again. It will be greatly damaged. In other words, it is desirable to install the optical component on the upper surface of the substrate in consideration of the connectivity with the electronic component, and it is desirable to take out the optical fiber from the upper portion of the substrate.
Moreover, in patent document 4, there existed a problem that the process of mounting an optical wiring in the interlayer part of a wiring board was very complicated.

In addition, when an optical fiber is mounted on a flexible printed circuit board, which has been in increasing demand in recent years as electronic devices become smaller, sufficient flexibility cannot be obtained with the same structure as a conventional optical composite printed circuit board. That is, in the conventional optical composite printed circuit board, the flexible printed circuit board is bent because the adhesive is applied to the entire longitudinal direction of the optical fiber contacting the printed circuit board or is adhered to the printed circuit board by attaching an adhesive film. In this case, there is no place where the stress applied to the optical fiber can be absorbed, and there are problems that the optical fiber is easily broken, and the life of components incorporated in the printed circuit board is shortened.
In addition to the increase in the process time when applying the adhesive and sticking the pressure-sensitive adhesive film, and the drying and fixing time, there is also a problem that the amount of members used such as the adhesive and the pressure-sensitive adhesive film increases.
Japanese Patent Laid-Open No. 10-227949 JP 2000-147270 A JP 2001-59911 A JP 2003-172828 A JP 2003-255149 A

  The present invention has been made in view of the above circumstances, and reduces and facilitates the trouble of mounting the optical wiring on the printed circuit board, realizes a long life of the printed circuit board, and An object of the present invention is to provide an optical composite printed circuit board that suppresses breakage and shortening of the lifetime of components incorporated in the printed circuit board.

  An optical composite printed circuit board according to claim 1 of the present invention includes a printed circuit board and an optical wiring arranged along the printed circuit board, and the optical wiring is locally provided at one or more locations in the longitudinal direction. It is mounted on the printed circuit board.

  An optical composite printed board according to a second aspect of the present invention is the optical composite printed board according to the first aspect, wherein the mounting means is an adhesive that fixes the optical wiring to the printed board.

  The optical composite printed board according to claim 3 of the present invention is characterized in that, in claim 2, the optical wiring is arranged between the mounting means so as to have a slack in its longitudinal direction.

  The optical composite printed circuit board according to claim 4 of the present invention is characterized in that, in claim 2, the printed circuit board is deformable at least in the vicinity of the optical wiring being slack in the longitudinal direction.

  The optical composite printed circuit board according to claim 5 of the present invention is the optical composite printed circuit board according to claim 4, wherein the optical wiring is in a direction intersecting with the direction in which the printed circuit board exhibits deformability in the vicinity of the slack in the longitudinal direction. It is characterized by being extended.

  An optical composite printed board according to a sixth aspect of the present invention is the printed composite board according to the first aspect, wherein the mounting means is inserted so that the optical wiring is sewn between one side and the other side of the printed board. It is one or more through-holes drilled in the substrate.

  The optical composite printed board according to claim 7 of the present invention is characterized in that, in claim 6, the through hole has a shape extending in a longitudinal direction of the optical wiring.

  An optical composite printed circuit board according to an eighth aspect of the present invention is the optical composite printed circuit board according to the sixth aspect, characterized in that the optical wiring is arranged between the mounting means so as to have a slack in its longitudinal direction.

  The optical composite printed circuit board according to claim 9 of the present invention is characterized in that, in claim 6, the printed circuit board is deformable in the vicinity of the optical wiring having a slack in its longitudinal direction.

  The optical composite printed circuit board according to claim 10 of the present invention is the optical composite printed circuit board according to claim 9, wherein the optical wiring is in a direction intersecting with the direction in which the printed circuit board exhibits deformability in the vicinity of the slack in the longitudinal direction. It is characterized by being extended.

  The optical composite printed circuit board of the present invention has a structure in which the optical wiring arranged along the printed circuit board is locally mounted on the printed circuit board at one or more locations in the longitudinal direction. There is no need for processing, and it is possible to reduce the labor of mounting the optical wiring on the printed circuit board, and to easily mount the optical wiring in a short time. In addition, the degree of freedom in designing the substrate is not impaired, and the amount of members such as an adhesive and an adhesive film used for mounting the optical wiring can be reduced.

  In addition, since the mounting of the optical wiring on the printed circuit board is local, a degree of freedom occurs in the optical wiring portion that is not mounted on the printed circuit board, and the stress applied to the optical wiring when the printed circuit board is bent is diffused, or It can be absorbed by an optical wiring portion that is not mounted on a printed circuit board and relaxed. Therefore, it is possible to reduce the troubles such as the optical wiring breakage and the sudden bending that affects the optical transmission characteristics, and to realize a long life, and the life of the components incorporated in the printed circuit board is shortened. It can also be suppressed.

Hereinafter, an example of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic plan view showing a first embodiment of the first structure of the optical composite printed circuit board according to the present invention, and FIG. 2 is a schematic side view thereof.
As shown in FIGS. 1 and 2, the optical composite printed circuit board 1A according to the present invention includes a printed circuit board 2 and an optical wiring 3 arranged along the printed circuit board 2, and the optical wiring 3 has its longitudinal length. It is mounted on the printed circuit board 2 locally by means of mounting with the adhesive 4 at one or more locations in the direction. In the embodiments described later, the same reference numerals are used for the same components as those in the above-described embodiments, and the description thereof will be omitted.

The printed circuit board 2 is a 0.05 mm to 1 mm thick board (so-called PBC: Printed Circuit) in which electrical circuit wiring (hereinafter referred to as “electrical wiring”) is printed and mounted on the surface or inside of an insulating plate. Board or PWB: Printed Wiring Board). Examples of the insulating substrate include bakelite and epoxy resin. The printed circuit board 2 may be a multilayer multilayer board in which a plurality of pattern layers and insulating layers are alternately laminated in addition to a board on which a circuit pattern is formed on one side or both sides.
In the present embodiment, a single-layer substrate having a circuit pattern formed on only one side is used. For convenience, the surface on which a circuit pattern is formed and an electronic component is mounted is provided on both sides of the printed circuit board. The surface opposite to the formed surface will be described as the back surface.

  The electrical wiring is a metal wiring such as aluminum (Al) or copper (Cu). For the production, a method of forming a wiring pattern such as aluminum (Al), copper (Cu), silver (Ag), gold (Au) or the like by vacuum deposition and lithography is used. In addition, after forming a circuit pattern by printing a conductive paste such as copper (Cu), silver (Ag), gold (Au) on a substrate by a screen printing method, baking the conductive paste, It may be formed by curing. There is also a method of forming a circuit pattern by laminating metal foil such as electrolytic copper foil and chemically etching the metal foil using an etching resist formed in a desired pattern.

  Examples of the optical wiring 3 include an optical fiber, a single core, or a multi-core optical fiber. The optical wiring 3 is arranged along the surface of the printed circuit board 2, one end 3 a is optically connected to a light emitting element, for example, one photoelectric conversion element 10 a, and the other end 3 b is, for example, the other photoelectric conversion It is optically connected to a light receiving element which is the element 10b. Furthermore, the optical wiring 3 is fixed to the printed circuit board 2 by means of mounting with an adhesive 4 at a plurality of locations in the longitudinal direction.

  In the illustrated example, one optical wiring 3 is arranged between the pair of photoelectric conversion elements 10a and 10b, but the present invention is not limited to this. In the illustrated example, the optical wiring 3 is mounted at two locations by the adhesive 4, but the number of mounting locations is not limited to this in the present invention.

The light emitting element is an integrated circuit having a light emitting unit that converts a digital electric signal from an electronic circuit (not shown) disposed on the printed circuit board 2 into an optical signal and emits signal light, and transmits the optical signal. It has the function to do. Specific examples of the light emitting element include a light emitting diode, a semiconductor laser, and a surface emitting laser.
The light receiving element is an integrated circuit having a light receiving portion that receives signal light transmitted from the light emitting element through an optical wiring, and converts the received optical signal into an electric signal corresponding to the intensity and outputs the electric signal. It has a function. Specific examples of the light receiving element include a photodiode.
The light emitting element and the light receiving element are arranged on the printed circuit board 2, and the light emitting part side and the light receiving part side are coupled by the optical wiring 10.

  The adhesive 4 locally fixes the optical wiring 3 at one or more places on the printed circuit board, and examples thereof include fixing means such as an adhesive, an adhesive film, or a double-sided adhesive tape.

  The optical composite printed circuit board according to the present embodiment has each end of the optical wiring 3 connected to the photoelectric conversion elements 10a and 10b, as shown in FIG. The optical composite printed circuit board 1B is connected to the connectors 20a and 20b, and as shown in FIG. 4, each end of the optical wiring 3 is connected to another electronic device 30a and 30b. You may do it.

As described above, the optical composite printed circuit board 1 (1A, 1B, 1C) according to the present embodiment is provided with the optical wiring arranged along the printed circuit board locally by an adhesive at one or more locations in the longitudinal direction. Since the optical wiring is fixed, it is possible to prevent the optical wiring from being worn by vibration or the like, and it is possible to prevent vibration and extra force from being applied to the optical wiring.
Furthermore, since the optical wiring is fixed to the printed circuit board locally, the optical wiring can be easily mounted without a complicated operation, and the fixing process time can be shortened.

Further, the optical composite printed board of the present invention is not limited to the one in which the optical wiring is linearly arranged, and the optical wiring may have a curved portion.
FIG. 5 is a schematic plan view showing a second embodiment of the first structure of the optical composite printed circuit board of the present invention.
As shown in FIG. 5, the optical composite printed circuit board 11 of the present invention includes a printed circuit board 2 and an optical wiring 3 arranged along the printed circuit board 2, and the optical wiring 3 includes a straight portion 13 and a curved line. It has a portion 23 and is mounted on the printed circuit board 2 locally by adhesives 4... 4 at one or more locations in the longitudinal direction.

This optical wiring 3 is also arranged along the surface of the printed circuit board 2, one end 3a is connected to a light emitting element which is, for example, one photoelectric conversion element 10a, and the other end 3b is, for example, the other photoelectric conversion element 10b. Is connected to the light receiving element. The optical wiring 3 has flexibility.
In the case of the present embodiment, the mounting position of the optical wiring 3 by the adhesive 4 is preferably the boundary portion between the straight line portion 13 and the curved portion 23 of the optical wiring 3, for example. In the illustrated example, the first straight portion 13a and the first curved portion 23a, the first curved portion 23a and the second straight portion 13b, the second straight portion 13b and the second curved portion 23b, and the second curved line. The portion 23b and the third straight portion 13c, the third straight portion 13c and the third curved portion 23c, and the third curved portion 23c and the fourth straight portion 13d are the mounting positions.

  As described above, the optical composite printed circuit board 11 according to the present embodiment stably arranges and fixes the optical wiring so that the bending stress does not reach the linear portion even if the optical wiring has a curved portion. Can do.

  FIG. 6 is a schematic plan view showing a third embodiment of the first structure of the optical composite printed circuit board according to the present invention. As shown in FIG. 6, the optical composite printed circuit board 21 of the present invention includes a printed circuit board 12 and an optical wiring 3 disposed along the printed circuit board 12, and the optical wiring 3 is 1 in the longitudinal direction. It is mounted on the printed circuit board 2 locally by the adhesive 4 at two or more locations, and is disposed between the adhesives 4 and 4 so as to have a slack portion 15 in the longitudinal direction.

In the case of the present embodiment, the printed circuit board 12 may be a so-called flexible printed circuit board (hereinafter, denoted by reference numeral 12). The flexible printed board 12 is a flexible film-like wiring board having flexibility, and has electrical wiring. This flexible printed circuit board 12 is formed from a heat resistant resin film, for example. Examples of the heat resistant resin film include films of polyimide resin, polyamideimide resin, polyetherimide resin, polyetheretherketone resin, and the like. Further, the printed circuit board 12 is not limited to being flexible as a whole. For example, only a part of the adhesive 4 and 4 in which the optical wiring 3 is arranged so as to have the slack portion 15 is flexible. It may be.
Thus, when it is set as a flexible printed circuit board, it can be used for the movable part of an apparatus, and even a small apparatus can be bent and used.

The optical wiring 3 is also arranged along the surface of the printed circuit board 12. One end 3a is connected to a light emitting element, for example, one photoelectric conversion element 10a, and the other end 3b is, for example, the other photoelectric conversion element 10b. Is connected to the light receiving element.
In the case of this embodiment, it is interposed between the first slack portion 15a and the adhesives 4 and 4 which have a margin in the dimension of the optical wiring 3 interposed between the one photoelectric conversion element 10a and the adhesive 4. The second slack portion 15b having a margin in the dimension of the optical wiring 3, and the third slack portion having a margin in the dimension of the optical wiring 3 interposed between the adhesive 4 and the other photoelectric conversion element 10b. 15c are secured.

  As described above, since the optical composite printed circuit board 21 according to this embodiment has a slack portion, the optical wiring is not subjected to bending or bending stress when the printed circuit board is bent or bent. In this way, breakage of the optical wiring can be prevented.

FIG. 7 is a schematic plan view showing a fourth embodiment of the first structure of the optical composite printed circuit board according to the present invention.
As shown in FIG. 7, the optical composite printed circuit board 31 of the present invention includes a printed circuit board 2 and an optical wiring 3 arranged along the printed circuit board 2, and the optical wiring 3 is slackened in the longitudinal direction thereof. It is locally mounted on the printed circuit board 2 by the adhesive 4 at one or more locations in the longitudinal direction so as to have the portion 15, and the printed circuit board 2 is in the vicinity where the optical wiring 3 is slack in the longitudinal direction. The structure has a deformability.

Here, the term “deformability” means that the initial shape such as flexibility, bendability, and stretchability is not maintained. In the embodiments described later, the deformability is the same unless otherwise specified.
Further, in the illustrated example of the present embodiment, the printed board 2 is partially bent in the vicinity of the slack portion 15 and is bent by a bendable bending portion 16. In the case of the present embodiment, the printed circuit board 2 may be a so-called flexible printed circuit board 12 that is entirely flexible.

  Thus, since the optical composite printed circuit board 31 of this embodiment has an optical wiring having a slack portion, even when the printed circuit board has a deformability, when the printed circuit board is bent, bent or stretched. The optical wiring can be prevented from being broken by preventing the stress due to the deformation from being applied to the optical wiring.

FIG. 8 is a schematic plan view showing a fifth embodiment of the first structure of the optical composite printed circuit board according to the present invention.
As shown in FIG. 8, the optical composite printed circuit board 51 of the present invention includes a printed circuit board 2 and an optical wiring 3 arranged along the printed circuit board 2, and the optical wiring 3 is slackened in the longitudinal direction thereof. It is locally mounted on the printed circuit board 2 by the adhesive 4 at one or more locations in the longitudinal direction so as to have the portion 15, and the printed circuit board 2 is in the vicinity where the optical wiring 3 is slack in the longitudinal direction. It has deformability. Further, the optical wiring 3 has a structure in which the printed circuit board 2 extends in a direction intersecting with the direction showing the deformability in the vicinity of the slack in the longitudinal direction.

It is desirable that the optical wirings 3 are arranged so as to intersect at an angle shallower than 90 degrees in a portion located at the bent portion 16. In the illustrated example of the present embodiment, the first bent portion 16a is arranged so as to intersect at an angle α less than 90 degrees, and the second bent portion 16b is arranged at an angle β smaller than 90 degrees. It is arranged to cross.
In the case of the present embodiment, the printed circuit board 2 may be a so-called flexible printed circuit board 12 that is entirely flexible.

  Thus, in the optical composite printed circuit board 51 of the present embodiment, the optical wiring is extended in a direction intersecting with the direction in which the printed circuit board exhibits deformability in the vicinity where the optical wiring has slackness in the longitudinal direction. Compared with the case where they intersect at an angle of 90 degrees, the curvature of bending applied to the optical wiring is relaxed, the optical wiring can be prevented from being broken, and the reliability with respect to deformation is increased.

  At this time, it is desirable that the optical wirings are arranged so as to intersect at an angle of 45 degrees or less in a portion located at the bent portion 16. At this time, the radius of curvature of the optical wiring on the bending axis is twice or more that when intersecting at 90 degrees, and the effect of reducing the curvature becomes very large.

FIG. 9 is a schematic plan view showing a sixth embodiment of the first structure of the optical composite printed circuit board according to the present invention.
As shown in FIG. 9, the optical composite printed circuit board 61 of the present invention includes a printed circuit board 2 having a meandering surface shape with a limited width, and two optical wirings arranged along the printed circuit board 2. 3A and 3B are provided, and both are meandering together (a configuration in which the optical wiring is bent at two or more portions).

  In the printed circuit board 2 having such a configuration, a place having deformability in a direction intersecting with the longitudinal direction of the two optical wirings 3A and 3B (a place where the optical wiring can have a slack in the longitudinal direction) It arrange | positions so that it may correspond to the meandering location (2 places in this example) 16c, 16d. At that time, each of the optical wirings 3A and 3B is locally provided by adhesives 4Aa, 4Ab, 4Ba, 4Bb, 4Ca, and 4Cb at one or more locations in front of the meandering locations 16c and 16d in the longitudinal direction. It is good to mount on the printed circuit board 2. If the optical wirings 3A and 3B are mounted on the printed circuit board with an adhesive in the area before the meandering part, the optical wirings 3A and 3B are not bound to the printed circuit board 2 at the meandering part, Although restricted, the movement is fairly free. Therefore, an optical composite printed board having a high degree of freedom with respect to mechanical deformation can be obtained by positioning the meandering portion as a portion requiring deformability.

  At this time, as shown in FIG. 9, in order to individually mount the two optical wirings 3A and 3B on the printed board 2, for example, adhesives 4Aa, 4Ab, 4Ba, and 4Bb may be provided at four locations. In order to mount the two optical wirings 3A and 3B together on the printed circuit board 2, for example, adhesives 4Ca and 4Cb are arranged at two locations so as to cover the two optical wirings 3A and 3B at the same time. It doesn't matter.

  In particular, in the case of the latter form, the number of optical wirings is not limited to two, and can correspond to a large number of three or more. As shown in FIG. 9, in addition to a method in which a large number of optical wirings are arranged in a plane on a printed board to form a bundle and mounted on the printed board with a single adhesive, a large number of optical wirings are printed. It is also possible to adopt a method in which the substrate is three-dimensionally arranged and bundled and mounted on the printed board with one adhesive.

  FIG. 9 shows a case where the optical wiring has two bent portions and the distance between the two locations is very close. However, when the distance between the two locations is long and a straight portion is included between the two locations, You may provide the part mounted with an adhesive material in a part. Further, FIG. 9 is an example in which two portions where the optical wiring is bent are provided, but as long as the configuration of the present invention is satisfied, the number of portions where the optical wiring is bent is not particularly limited, and may be three or more. . Furthermore, although FIG. 9 shows an example in which the optical wiring is provided only on one surface side of the printed board, the optical wiring may be arranged on both surfaces.

In the optical composite printed circuit board of the present invention, the mounting means is not the first structure using the adhesive described above, but may be the second structure using a through hole. Hereinafter, each embodiment of the second structure of the present invention using a through hole as means for mounting will be described.
FIG. 10 is a schematic plan view showing a first embodiment of the second structure of the optical composite printed circuit board of the present invention, and FIG. 11 is a schematic side view thereof. In each embodiment described later, each embodiment of the second structure will be described unless otherwise specified, and the description of the second structure will be omitted.
As shown in FIGS. 10 and 11, the optical composite printed circuit board 101 of the present invention includes a printed circuit board 102 and an optical wiring 103 arranged along the printed circuit board 102, and the optical wiring 103 has a longitudinal length thereof. It is mounted on the printed circuit board 102 locally by means of mounting by the through hole 114 at one or more locations in the direction.

The printed board 102 is a 0.05 mm to 1 mm thick board (so-called PBC: Printed Circuit) in which electrical circuit wiring (hereinafter referred to as “electrical wiring”) is printed and mounted on the surface or inside of an insulating plate. Board or PWB: Printed Wiring Board). Examples of the insulating substrate include bakelite and epoxy resin. The printed board 102 may be a multilayer multilayer board in which a plurality of pattern layers and insulating layers are alternately stacked, in addition to a board on which a circuit pattern is formed on one side or both sides.
In the present embodiment, a single-layer substrate having a circuit pattern formed on only one side is used. For convenience, the surface on which a circuit pattern is formed and an electronic component is mounted is provided on both sides of the printed circuit board. The surface opposite to the formed surface will be described as the back surface.

  The electrical wiring is a metal wiring such as aluminum (Al) or copper (Cu). For the production, a method of forming a wiring pattern such as aluminum (Al), copper (Cu), silver (Ag), gold (Au) or the like by vacuum deposition and lithography is used. In addition, after forming a circuit pattern by printing a conductive paste such as copper (Cu), silver (Ag), gold (Au) on a substrate by a screen printing method, baking the conductive paste, It may be formed by curing. There is also a method of forming a circuit pattern by laminating metal foil such as electrolytic copper foil and chemically etching the metal foil using an etching resist formed in a desired pattern.

Examples of the optical wiring 103 include an optical fiber, a single core, or a multi-core optical fiber. The optical wiring 103 is disposed along the surface of the printed circuit board 102, one end 103a is optically connected to a light emitting element, for example, one photoelectric conversion element 110a, and the other end 103b is, for example, the other photoelectric conversion. It is optically connected to a light receiving element which is the element 110b. Further, the optical wiring 103 is fixed to the printed circuit board 102 by means of mounting by the through holes 114 at a plurality of locations in the longitudinal direction.
In the illustrated example, one optical wiring 103 is arranged between the pair of photoelectric conversion elements 110a and 110b, but the present invention is not limited to this. In the illustrated example, the optical wiring 103 is mounted at two locations by the through holes 114, but the position and number of mounting locations are not limited to this.

  Further, the optical wiring 103 is inserted through the through holes 114 formed in the printed circuit board 102 at a plurality of positions (two positions in the figure) in the longitudinal direction so as to sew between the front surface and the back surface of the printed circuit board 102. As a result, the printed circuit board 102 is fixed. In the illustrated example, the optical wiring 103 includes a first wiring portion 103A disposed on the front surface side of the printed circuit board 102 and a second wiring portion disposed on the back surface side of the printed circuit board 102 through the through hole 114. 103B and the first wiring portion 103A which is inserted through the through-hole 114 again and arranged on the surface side of the printed circuit board 102.

The light emitting element is an integrated circuit having a light emitting unit that converts a digital electric signal from an electronic circuit (not shown) disposed on the printed circuit board 102 into an optical signal and emits signal light, and transmits the optical signal. Has the function of Specific examples of the light emitting element include a light emitting diode, a semiconductor laser, and a surface emitting laser.
The light receiving element is an integrated circuit having a light receiving portion that receives signal light transmitted from the light emitting element through an optical wiring, and converts the received optical signal into an electric signal corresponding to the intensity and outputs the electric signal. It has a function. Specific examples of the light receiving element include a photodiode.
The light emitting element and the light receiving element are arranged on the printed circuit board 102, and the light emitting unit side and the light receiving unit side are coupled by the optical wiring 103.

  As described above, the optical composite printed circuit board 101 according to the present embodiment is complicated because the optical wiring 103 arranged along the printed circuit board 102 is locally attached by the through holes 114 at one or more locations in the longitudinal direction. Therefore, it is possible to easily mount the optical wiring without having to perform a troublesome work, and the process time for mounting can be shortened. Further, since it is not necessary to use a fixing means such as an adhesive, the cost can be reduced.

  In the present embodiment, the printed circuit board 102 may be a so-called flexible printed circuit board. The flexible printed board is a flexible film-like wiring board having flexibility, and has electric wiring. This flexible printed circuit board is formed from, for example, a heat resistant resin film. Examples of the heat resistant resin film include films of polyimide resin, polyamideimide resin, polyetherimide resin, polyetheretherketone resin, and the like.

  Further, it is desirable that the through hole 114 is formed to have a size that allows the optical wiring 103 to be inserted while allowing movement in the length direction. Thereby, the stress applied to the optical wiring can be dispersed and damage can be prevented. If the optical wiring 103 is formed to have a size allowing the optical wiring 103 to be moved in the longitudinal direction, the through hole 114 penetrates the printed circuit board 102 from the front surface to the back surface so as to be orthogonal to the side surface. However, as shown in FIGS. 12 and 13, for example, as shown in FIGS. 12 and 13, the degree of freedom in the width direction of the optical wiring 103 is suppressed, and the degree of freedom in the longitudinal direction is limited. Desirable shape. FIG. 12 is a schematic plan view for explaining the structure of the through hole, and FIG. 13 is a schematic side sectional view thereof.

  As shown in FIGS. 12 and 13, the through-hole 114 penetrates obliquely from the front surface side to the back surface side of the printed circuit board 102 along the length direction of the optical wiring 103, and its longitudinal side surface 124 a is penetrated. The optical wiring 103 passing through the hole 114 is drilled in an oblique shape close to the angle, and the side surface 124b in the width direction is drilled perpendicularly from the front surface to the back surface of the printed circuit board 102. Has been. The through hole 114 is provided to avoid the circuit pattern of the printed board 102.

  As described above, the longitudinal side surface 124a of the through hole 114 is formed in an oblique shape and the width direction side surface 124b is formed in a vertical shape. Thus, the degree of freedom in the width direction can be suppressed, and only the degree of freedom in the longitudinal direction can be given, and the stress applied to the optical wiring can be dispersed. In addition, it is possible to easily insert the optical wiring 103 into the through hole 114.

  The optical composite printed circuit board of the present embodiment is such that each end of the optical wiring 103 is connected to the photoelectric conversion elements 110a and 110b as described above, but the present invention is not limited to this, For example, each end of the optical wiring 103 is connected to a connector (not shown), or each end of the optical wiring 3 is connected to another electronic device (not shown). Also good.

Further, the optical composite printed board of the present invention is not limited to the one in which the optical wiring is linearly arranged, and the optical wiring may have a curved portion.
FIG. 14 is a schematic plan view showing a second embodiment of the second structure of the optical composite printed circuit board of the present invention.
As shown in FIG. 14, the optical composite printed circuit board 111 of the present invention includes a printed circuit board 102 and an optical wiring 103 arranged along the printed circuit board 102, and the optical wiring 103 includes a straight portion 113 and a curved line. It has a portion 123 and is mounted on the printed circuit board 102 locally by through holes 114... 114 at one or more locations in the longitudinal direction.

  This optical wiring 103 is also arranged along the surface of the printed circuit board 102, one end 103a is connected to a light emitting element which is, for example, one photoelectric conversion element 110a, and the other end 103b is, for example, the other photoelectric conversion element 110b. Is connected to the light receiving element. The optical wiring 103 has flexibility.

  In the case of the present embodiment, the mounting position of the optical wiring 103 by the through hole 114 is preferably, for example, the boundary portion between the linear portion 113 and the curved portion 123 of the optical wiring 103. In the illustrated example, the first linear portion 113a and the first curved portion 123a, the first curved portion 123a and the second linear portion 113b, the second linear portion 113b and the second curved portion 123b, and the second curved line. The portion 123b and the third straight portion 113c, the third straight portion 113c and the third curved portion 123c, and the third curved portion 123c and the fourth straight portion 113d are the mounting positions, respectively.

  As described above, the optical composite printed circuit board 111 according to the present embodiment stably arranges and fixes the optical wiring so that the bending stress does not reach the linear portion even if the optical wiring has a curved portion. Can do.

FIG. 15 is a partially enlarged schematic plan view showing a third embodiment of the second structure of the optical composite printed circuit board of the present invention.
As shown in FIG. 15, the optical composite printed circuit board 121 of the present invention includes a printed circuit board 102 and an optical wiring 103 arranged along the printed circuit board 102, and the optical wiring 103 is slack in the longitudinal direction thereof. It is locally mounted on the printed circuit board 2 by the through hole 114 at one or more locations in the longitudinal direction so as to have the portion 115, and the printed circuit board 102 is in the vicinity where at least the optical wiring 3 has a slack in the longitudinal direction. The structure has a deformability.

Here, the term “deformability” means that the initial shape such as flexibility, bendability, and stretchability is not maintained. In the embodiments described later, the deformability is the same unless otherwise specified.
In the illustrated example of the present embodiment, the printed board 102 is partially bent in the vicinity having the slack portion 115 and is bent by a bendable bending portion 116. In the case of the present embodiment, the printed circuit board 102 may be a so-called flexible printed circuit board that is entirely flexible.

  Thus, since the optical composite printed circuit board 121 of this embodiment has a slack portion, the optical wiring has a deformability, so even when the printed circuit board is deformable, when it is bent, bent or stretched. The optical wiring can be prevented from being broken by preventing the stress due to the deformation from being applied to the optical wiring.

FIG. 16 is a schematic plan view showing a fourth embodiment of the second structure of the optical composite printed circuit board of the present invention.
As shown in FIG. 16, the optical composite printed circuit board 131 of the present invention includes a printed circuit board 102 and an optical wiring 103 arranged along the printed circuit board 102, and the printed circuit board 102 has a length of the optical wiring 103. The optical wiring 103 is locally mounted on the printed circuit board 102 by the through-hole 114 at one or more locations in the longitudinal direction. Moreover, the printed circuit board 102 is provided with the local opening part 117 in the part provided with the said deformability.

In the illustrated example of the present embodiment, the printed circuit board 102 is partially bent from the bendable bending portion 116, but may be a flexible printed circuit board.
Further, the optical wiring 103 is arranged along the surface of the printed circuit board 2, and similarly to the above-described embodiment, one end 103 a is connected to a light emitting element that is, for example, one photoelectric conversion element 110 a, and the other end 103 b is For example, it is connected to the light receiving element which is the other photoelectric conversion element 110b. Further, the optical wiring 103 may have a slack portion (not shown) in the longitudinal direction in a portion having deformability.
The opening 117 is formed by removing the printed board 102 by a predetermined length across the bent portion 116.

  As described above, the optical composite printed circuit board 131 according to the present embodiment includes a local opening in a portion of the printed circuit board having deformability, so that when the printed circuit board is bent or bent, the optical wiring is printed on the printed circuit board. The optical wiring can move freely through the opening. Therefore, bending or bending stress does not reach the optical wiring, damage to the optical wiring is reduced, and durability of the optical wiring can be improved.

FIG. 17 is a schematic plan view showing a fifth embodiment of the second structure of the optical composite printed circuit board according to the present invention.
As shown in FIG. 17, the optical composite printed circuit board 151 of the present invention includes a printed circuit board 102 and an optical wiring 103 arranged along the printed circuit board 102, and the optical wiring 103 is slackened in the longitudinal direction thereof. The printed circuit board 102 is locally mounted on the printed circuit board 102 by the through-hole 114 at one or more places in the longitudinal direction so as to have the portion 115, and the printed circuit board 102 is at least near the optical wiring 103 having a slack in the longitudinal direction. It has deformability. Further, the optical wiring 103 has a structure in which the printed circuit board 102 is extended in a direction intersecting the direction showing the deformability in the vicinity where the optical wiring 103 has slackness in the longitudinal direction.

The optical wiring 103 is arranged so as to intersect at an angle shallower than 90 degrees at a portion located at the bent portion 116. In the illustrated example of the present embodiment, the first bent portion 116a is arranged so as to intersect with an angle of α smaller than 90 degrees, and the second bent portion 116b with an angle β smaller than 90 degrees. It is arranged to cross.
In the case of the present embodiment, the printed circuit board 102 may be a so-called flexible printed circuit board that is entirely flexible.

  As described above, the optical composite printed circuit board 151 of the present embodiment extends in a direction intersecting the direction in which the printed circuit board exhibits deformability in the vicinity where the optical wiring has a slack in the longitudinal direction. Compared with the case where they intersect at an angle of 90 degrees, the curvature of bending applied to the optical wiring is relaxed, the optical wiring can be prevented from being broken, and the reliability with respect to deformation is increased.

  At this time, it is desirable that the optical wirings are arranged so as to intersect at an angle of 45 degrees or less in a portion located at the bent portion 116. At this time, the radius of curvature of the optical wiring on the bending axis is twice or more that when intersecting at 90 degrees, and the effect of reducing the curvature becomes very large.

FIG. 18 is a schematic plan view showing a sixth embodiment of the second structure of the optical composite printed circuit board according to the present invention.
As shown in FIG. 18, the optical composite printed circuit board 161 of the present invention includes a printed circuit board 102 having a meandering surface shape with a limited width and two optical wirings arranged along the printed circuit board 102. 103A and 103B are provided, and both are meandering together (a configuration having two or more portions where the optical wiring is bent).

  In the printed circuit board 102 having such a configuration, a portion having deformability in a direction intersecting with the longitudinal direction of the two optical wirings 103A and 103B (a portion where the optical wiring can have a slack in the longitudinal direction) It arrange | positions so that it may correspond to the meandering place (2 places in this example) 116c, 116d. At that time, each of the optical wirings 103A and 103B is locally attached to the printed circuit board 102 by the through holes 104Aa, 104Ab, 104Ba, and 104Bb at one or more locations in front of the portions 116c and 116d that meander in the longitudinal direction. It is good to implement. If the optical wirings 103A and 103B are mounted on the printed circuit board through the through holes in the area in front of the meandering part, the optical wirings 103A and 103B are not bound to the printed circuit board 102 in the meandering part. Although restricted, the movement is fairly free. Therefore, an optical composite printed board having a high degree of freedom with respect to mechanical deformation can be obtained by positioning the meandering portion as a portion requiring deformability.

  As shown in FIG. 18, in order to individually mount the two optical wirings 103A and 103B on the printed circuit board 102, for example, through holes 104Aa, 104Ab, 104Ba, and 104Bb may be provided at four locations. In order to mount the two optical wirings 103A and 103B together on the substrate 102, for example, a single through hole (not shown) extending in a direction crossing the two optical wirings is used. A configuration in which two optical wirings are collectively passed may be used.

  In particular, in the case of the latter form, the number of optical wirings is not limited to two, and can correspond to a large number of three or more. In addition to a method in which a large number of optical wirings are arranged in a bundle on a printed circuit board in a bundle and mounted on the printed circuit board with a single through hole, a large number of optical wirings are three-dimensionally formed on the printed circuit board. It is also possible to adopt a method of arranging them in a bundle and mounting them with one through hole on the printed circuit board.

  FIG. 18 shows a case where the optical wiring has two bent portions and the distance between the two locations is very close. However, when the distance between the two locations is long and a straight portion is included between the two locations, You may provide the part mounted by a through-hole in a part. Further, FIG. 9 is an example in which two portions where the optical wiring is bent are provided, but as long as the configuration of the present invention is satisfied, the number of portions where the optical wiring is bent is not particularly limited, and may be three or more. .

  The optical composite printed circuit board of the present invention can be applied to various electronic devices.

It is a schematic plan view which shows the 1st example of 1st embodiment in the 1st structure of the optical composite printed circuit board which concerns on this invention. It is a schematic side view of the 1st example of 1st embodiment shown in FIG. It is a schematic plan view which shows the 2nd example of 1st embodiment in the 1st structure of the optical composite printed circuit board which concerns on this invention. It is a schematic plan view which shows the 3rd example of 1st embodiment in the 1st structure of the optical composite printed circuit board which concerns on this invention. It is a schematic plan view which shows 2nd embodiment in the 1st structure of the optical composite printed circuit board which concerns on this invention. It is a schematic plan view which shows 3rd embodiment in the 1st structure of the optical composite printed circuit board which concerns on this invention. It is a schematic plan view which shows 4th embodiment in the 1st structure of the optical composite printed circuit board which concerns on this invention. It is a schematic plan view which shows 5th embodiment in the 1st structure of the optical composite printed circuit board which concerns on this invention. It is a schematic plan view which shows 6th embodiment in the 1st structure of the optical composite printed circuit board which concerns on this invention. It is a schematic plan view which shows 1st embodiment in the 2nd structure of the optical composite printed circuit board which concerns on this invention. It is a schematic sectional drawing of 1st embodiment shown in FIG. It is a schematic plan view explaining the structure of the through-hole used by the 2nd structure of the optical composite printed circuit board concerning this invention. It is a schematic sectional side view which shows the through-hole shown in FIG. It is a schematic plan view which shows 2nd embodiment in the 2nd structure of the optical composite printed circuit board which concerns on this invention. It is a schematic plan view which shows 3rd embodiment in the 2nd structure of the optical composite printed circuit board which concerns on this invention. It is a partial expansion schematic plan view which shows 4th embodiment in the 2nd structure of the optical composite printed circuit board which concerns on this invention. It is a schematic plan view which shows 5th embodiment in the 2nd structure of the optical composite printed circuit board which concerns on this invention. It is a partial expansion schematic plan view which shows 6th embodiment in the 2nd structure of the optical composite printed circuit board which concerns on this invention.

Explanation of symbols

1 (1A, 1B, 1C), 11, 21, 31, 51, 61, 101, 111, 121, 131, 151, 161 Optical composite printed circuit board, 2, 102 Printed circuit board, 3, 103 Optical wiring (optical fiber) 3a, 3b, 103a, 103b End part, 3A, 103A First wiring part (optical wiring, optical fiber), 3B, 103B Second wiring part (optical wiring, optical fiber), 4 (4Aa, 4Ab, 4Ba, 4Bb 4Ca, 4Cb) Adhesive, 10a, 10b, 110a, 110b Photoelectric conversion element (light emitting / receiving element), 12, 112 Flexible printed circuit board, 13 (13a, 13b, 13c, 13d), 113 (113a, 113b, 113c, 113d) Straight portion, 104 (104Aa, 104Ab, 104Ba, 104Bb), 107, 114 Through-hole, 15, 115 Loose Parts, 16, 116 bent portion, 17, 117 opening, 23 (23a, 23b, 23c), 123 (123a, 123b, 123c) curved portion.

Claims (10)

A printed circuit board, and an optical wiring arranged along the printed circuit board,
The optical composite printed circuit board, wherein the optical wiring is locally mounted on the printed circuit board at one or more locations in the longitudinal direction.   The optical composite printed circuit board according to claim 1, wherein the mounting means is an adhesive that fixes the optical wiring to the printed circuit board.   The optical composite printed circuit board according to claim 2, wherein the optical wiring is arranged so as to have a slack in a longitudinal direction between the mounting means.   The optical composite printed circuit board according to claim 2, wherein the printed circuit board is deformable at least in the vicinity of the optical wiring having a slack in the longitudinal direction thereof.   5. The optical composite print according to claim 4, wherein the optical wiring is extended in a direction intersecting with a direction in which the printed circuit board exhibits deformability in the vicinity having a slack in the longitudinal direction thereof. substrate.   The mounting means is one or more through holes formed in the printed circuit board through which the optical wiring is inserted so as to sew between one surface and the other surface of the printed circuit board. The optical composite printed circuit board according to claim 1.   The optical composite printed circuit board according to claim 6, wherein the through hole has a shape extending in a longitudinal direction of the optical wiring.   The optical composite printed circuit board according to claim 6, wherein the optical wiring is arranged so as to have a slack in a longitudinal direction between the mounting means.   The optical composite printed circuit board according to claim 6, wherein the printed circuit board is deformable in the vicinity of the optical wiring having a slack in the longitudinal direction thereof. 10. The optical composite print according to claim 9, wherein the optical wiring is extended in a direction intersecting with a direction in which the printed circuit board exhibits deformability in the vicinity having a slack in the longitudinal direction thereof. substrate.

Images