JP2008015099A - Optical substrate and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical substrate which can suppress optical loss, hardly causes the stripping of an optical line from a clad and facilitates the working or mounting, and to provide a method of manufacturing the optical substrate. <P>SOLUTION: A mold 10 having a flat surface 10A and concave parts 10B formed on the flat surface 10A, in which each of the concave parts 10B has a bottom surface 10C consisting of semi-circular cylindrical surface formed with a radius having the same size as the radius of a core 20, and the size between the lowermost part of the bottom surface 10C and the flat surface is the same size as a diameter of the core 20 or is formed in a size slightly larger than the diameter of the core 20. By filling core materials into concave parts 10B so as to heap up the same, cores 20 whose cross-sections have an approximately circular shape are formed. By forming the clad 30 over the flat surface 10A and the concave parts 10B, the clad 30 is joined to the cores 20. By separating the mold 10 from the clad 30 on which the cores 20 are joined, the optical substrate is obtained. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical substrate and a manufacturing method thereof.

An optical substrate in which the upper portion of the core (optical wiring) is not covered with overclad and the upper portion of the core is exposed to the atmosphere is called a ridge-type optical substrate.
Ridge-type optical substrates can be manufactured at low cost, and can be thinned with less clad, so they have various advantages such as being strong against bending, having few constituent materials, and being easy to align during mounting. (See Patent Document 1).
Japanese Patent Laid-Open No. 10-90544

However, since the conventional ridge-type optical substrate has a structure in which the core has a quadrangular prism shape (optical wiring) on the cladding with a square cross section, the core (optical wiring) is peeled off from the cladding. Has a problem that it deviates from a predetermined position of the clad. In addition, since the cross section of the optical wiring is square, there is a problem that the optical loss (connection loss) is large when the ridge type optical substrate is joined to an optical fiber or a light emitting / receiving element that is an optical component having a circular cross section of the optical wiring. was there.
The present invention has been made in view of the drawbacks of the prior art, and an object of the present invention is to suppress optical loss at the time of joining with an optical fiber or a light emitting / receiving element and to prevent the optical wiring from being peeled off from the clad. It is an object of the present invention to provide an optical substrate including a novel ridge-type waveguide that is not easily displaced from a predetermined position on the cladding even when the optical wiring is peeled off from the cladding, and that is easy to process and mount the end face, and a method for manufacturing the same.

  In order to achieve the above object in the present invention, an optical wiring pattern is formed using a mold having a semicircular bottom-shaped concave portion or a semicircular tip-shaped convex portion.

Preferably, a high-viscosity polymer material is used as the core material, and a circular approximate shape can be formed by surface tension or the like. Furthermore, the mold can be subjected to a surface treatment to control the contact angle between the core material and the mold. By processing the mold, a circular approximate shape can be formed at a lower cost than adjusting the material properties.
The surface of the mold is preferably subjected to surface treatment so that the contact angle between the mold surface and the core material is 90 ° or more and 150 ° or less.
When the contact angle is less than 90 °, it is difficult to make the core shape circular, and when the contact angle is greater than 150 °, filling of the core material into the mold is likely to occur.

  Further, by providing the unevenness for forming the optical wiring and the unevenness for forming the outer shape processing pattern of the optical substrate on the mold, the optical wiring formation and the outer shape processing can be performed simultaneously in one mold-making process. This simplifies the process and improves the positional accuracy of the external processing of the optical wiring and the optical substrate.

  Further, an optical wiring can be formed by using a convex mold, forming an optical wiring pattern on the clad material, and filling the core material therein.

  An optical wiring can be formed by using a concave mold and filling a core material on the mold.

The invention of claim 1 is an optical substrate comprising an optical wiring comprising a core and a clad, wherein the core has a circular approximate cross section, and the core is bonded to the clad. The optical substrate is supported by the clad.
The invention according to claim 2 is the optical substrate according to claim 1, wherein the clad has a cylindrical approximate surface joined to a part of the outer peripheral surface of the core.
According to a third aspect of the present invention, the clad has a flat surface, a convex portion is formed to extend on the surface, and a cylindrical approximate surface along the extending direction of the convex portion at the tip of the convex portion. The optical substrate according to claim 1, wherein a part of the outer periphery of the core is bonded to the cylindrical approximate surface and supported by the clad.
According to a fourth aspect of the present invention, the bottom of the cylindrical approximate surface is located on the same plane as the flat surface of the cladding, or is located above the surface. It is an optical substrate.
According to a fifth aspect of the present invention, the clad has a flat surface, a recess is formed on the surface, the recess is formed with a cylindrical approximate surface, and the core has a part of the outer periphery thereof. The optical substrate according to claim 1, wherein the optical substrate is bonded to an approximately cylindrical surface and supported by the clad.
According to a sixth aspect of the present invention, the clad has a flat surface, a recess is formed on the surface, and the recess has a pair of side surfaces facing each other in a dimension in which the core is accommodated. It is constituted by a cylindrical approximate surface connecting lower portions of the pair of side surfaces, the core is accommodated in the concave portion, and a part of the outer periphery thereof is joined to the cylindrical approximate surface and supported by the clad. An optical substrate according to claim 1.

  The invention of claim 7 is a method of manufacturing an optical substrate comprising a clad bonded to an optical wiring formed of a core having a substantially circular cross-section, and is formed on a flat surface and the flat surface. The recess has a bottom surface composed of a semicircular cylindrical approximate surface formed with a radius having the same dimension as the radius of the core, and is between the lowermost portion of the bottom surface and the flat surface. The cross section is obtained by preparing a mold having the same dimension as the diameter of the core, or a mold formed slightly larger than the diameter of the core, and raising and filling the core material in the recess. Forming a circularly approximate core, forming a clad on the flat surface and the recess, joining the clad and the core, and separating the mold from the clad to which the core is joined. Optical substrate manufacturing It is the law.

  The invention of claim 8 is a method of manufacturing an optical substrate comprising a clad bonded to an optical wiring formed of a core having a substantially circular cross section, and is formed on a flat surface and the flat surface. The recess has a bottom surface composed of a semicircular cylindrical approximate surface formed with a radius having the same dimension as the radius of the core, and is between the lowermost portion of the bottom surface and the flat surface. The cross section is obtained by preparing a mold having the same dimension as the diameter of the core, or a mold formed slightly larger than the diameter of the core, and raising and filling the core material in the recess. Forming a substantially circular core, and bonding the core to the cladding by pressing the mold and the core formed on the mold against the surface of the cladding formed on a plate-shaped support medium; Front from the core and the cladding A method for manufacturing an optical substrate, which comprises a step of separating the mold.

  The invention of claim 9 is a method of manufacturing an optical substrate comprising a clad bonded to an optical wiring formed of a core having a substantially circular cross section, and is formed on a flat surface and the flat surface. The convex portion has a top surface made of a semicircular cylindrical approximate surface formed with a radius having the same dimension as the radius of the core, and the top surface of the top surface is flat with the flat surface. A step of preparing a mold having a dimension between the surface and the core that is the same as or slightly larger than the diameter of the core, and pressing the mold against the surface of the clad. Forming a flat surface of the mold on the surface of the clad and a flat surface and a concave portion corresponding to the convex portion, a step of separating the die from the clad, and raising and filling a core material into the concave portion. When a core with a circular cross section is formed, A method for manufacturing an optical substrate, which comprises a step of joining the core to the cladding.

  The invention of claim 10 is a method of manufacturing an optical substrate comprising a clad bonded to an optical wiring formed of a core having a substantially circular cross section, and is formed on a flat surface and the flat surface. The convex portion has a top surface made of a semicircular cylindrical approximate surface formed with a radius having the same dimension as the radius of the core, and the top surface of the top surface is flat with the flat surface. And a step of preparing a mold having a dimension between the surface and the core that is the same as or slightly larger than the diameter of the core, and formed on a plate-like support medium. Forming a flat surface and a concave portion corresponding to the flat surface of the mold and the convex portion on the surface of the clad by pressing the die against the surface of the clad; separating the mold from the clad; and the concave portion The cross-section is increased by filling the core material A method for manufacturing an optical substrate, characterized in that to form the core of the approximate shape and a step of joining the core to the cladding.

  The invention of claim 11 is a method of manufacturing an optical substrate comprising a clad bonded to an optical wiring formed of a core having a substantially circular cross section, and is formed on a flat surface and the flat surface. A plurality of convex portions and a plurality of contour partition convex portions formed on the flat surface, and the convex portions are semicircular cylindrical approximate surfaces formed with a radius having the same dimension as the radius of the core. The top surface of the top surface and the flat surface have the same dimension as the diameter of the core, or a dimension slightly larger than the diameter of the core, and A step of preparing a mold in which a dimension between the uppermost part of the outer-partition convex part and the flat surface is larger than a dimension between the uppermost part of the top surface and the flat surface; Pressing the mold against the surface of the clad formed on the plate-like support medium Forming a flat surface and a concave portion corresponding to the flat surface and the convex portion of the mold on the surface of the clad, and simultaneously separating the clad into a plurality of clad division bodies by the convex portion for the outer partition; and the clad A step of separating the mold from the divided body, and forming a core having a substantially circular cross section by raising and filling a core material in the recess, and joining the core to the clad divided body to form a plurality of optical substrates. It is a manufacturing method of the optical board | substrate characterized by including the process of obtaining, and the process of isolate | separating the said optical board | substrate from the said support medium.

According to a twelfth aspect of the present invention, there is provided an optical substrate manufacturing method in which a clad is bonded to an optical wiring formed of a core having a substantially circular cross section, and has a plurality of clad forming recesses. And a step of preparing a support medium formed from a convex portion for external partition standing upright from the bottom surface so as to surround the bottom surface and the periphery of the bottom surface, and the respective concave portions for clad formation A step of filling a clad material to form a plurality of clads, and a flat surface and a convex portion formed on the flat surface, wherein the convex portion is formed with a radius of the same dimension as the radius of the core A top surface consisting of a semicircular cylindrical approximate surface, the dimension between the top of the top surface and the flat surface being the same as the diameter of the core or slightly larger than the diameter of the core The process of preparing the mold formed with dimensions, and before On the surface of the cladding by pressing said mold into a plurality of clad surface, forming a flat surface and recesses corresponding to the flat surface and the convex portion of the mold,
A step of separating the mold from the plurality of clads, and forming a core having a circular approximate cross-section by raising and filling a core material in the recess, and joining the core to the clad to form a plurality of optical substrates. It is a manufacturing method of the optical board | substrate characterized by including the process of obtaining, and the process of isolate | separating the said optical board | substrate from the said support medium.

  The invention of claim 13 is a method of manufacturing an optical substrate comprising a clad bonded to an optical wiring formed of a core having a substantially circular cross section, and has a plurality of clad forming recesses. And a step of preparing a support medium formed from a convex portion for external partition standing upright from the bottom surface so as to surround the bottom surface and the periphery of the bottom surface, and the respective concave portions for clad formation A step of filling a clad material to form a plurality of clads, a flat surface, a convex portion formed on the flat surface, and a concave portion for positioning that engages the convex portion for external partition formed on the flat surface without rattling And the convex portion has a top surface made of a semicircular cylindrical approximate surface formed with a radius of the same dimension as the radius of the core, and is between the uppermost portion of the top surface and the flat surface. Is the same as the diameter of the core, or Alternatively, the step of preparing a mold formed with a dimension slightly larger than the diameter of the core, and the engagement of the positioning recess of the mold with the outer partitioning protrusion of the support medium, Forming a flat surface and a concave portion corresponding to the flat surface of the mold and the convex portion on the surface of the clad by pressing the mold against the surfaces of the plural clads, and separating the mold from the plural clads And forming a plurality of optical substrates by joining a core material to the clad while forming a core having a substantially circular cross-section by raising and filling a core material in the recess, and the light from the support medium And a step of separating the substrate.

  The invention of claim 14 is an optical substrate manufacturing method comprising a clad bonded to an optical wiring formed of a core having a substantially circular cross section, and has a plurality of clad forming recesses. And a step of preparing a support medium formed from a convex portion for external partition standing upright from the bottom surface so as to surround the bottom surface and the periphery of the bottom surface, and the respective concave portions for clad formation A step of filling a clad material to form a plurality of clads, and a flat surface and a plurality of recesses formed on the flat surface, wherein the recesses are formed with a radius the same as the radius of the core A bottom surface composed of a semicircular cylindrical approximate surface, and the dimension between the lowermost part of the bottom surface and the flat surface is the same as the diameter of the core or slightly larger than the diameter of the core Step of preparing the formed mold A step of forming a plurality of cores having a substantially circular cross section by raising and filling a core material in each of the recesses, and the mold and the plurality of cores formed on the mold on the surfaces of the plurality of clads. Bonding the core to the cladding by pressing, obtaining a plurality of optical substrates simultaneously by separating the mold from the plurality of cores and the plurality of claddings, and separating the optical substrate from the support medium A process for producing an optical substrate comprising the steps of:

  The invention of claim 15 is an optical substrate manufacturing method comprising a clad bonded to an optical wiring formed of a core having a substantially circular cross section, and has a plurality of clad forming recesses. And a step of preparing a support medium formed from a convex portion for external partition standing upright from the bottom surface so as to surround the bottom surface and the periphery of the bottom surface, and the respective concave portions for clad formation A step of filling a clad material to form a plurality of clads, and a flat surface, a plurality of concave portions formed on the flat surface, and a convex portion for partitioning formed on the flat surface without engaging with each other A concave portion, and the concave portion has a bottom surface formed of a semicircular cylindrical approximate surface formed with a radius having the same dimension as the radius of the core, and a dimension between the lowermost portion of the bottom surface and the flat surface. Is the same dimension as the diameter of the core Alternatively, a step of preparing a mold formed with a dimension slightly larger than the diameter of the core, and a plurality of cores having a substantially circular cross section are formed by raising and filling the core material in each of the recesses. And pressing the mold and the plurality of cores formed on the mold against the surfaces of the plurality of clads, while engaging the positioning recess of the mold with the outer-partition projection of the support medium. Bonding the core to the clad, obtaining a plurality of optical substrates simultaneously by separating the mold from the plurality of cores and the plurality of clads, and separating the optical substrate from the support medium; It is the manufacturing method of the optical board | substrate characterized by including.

The invention of claim 16 is characterized in that a positioning pin is provided on one of the mold and the support medium, and a positioning hole for fitting the positioning pin is provided on the other. A method for manufacturing a substrate.
The invention according to claim 17 is characterized in that the contact angle between the surface of the mold and the core material is 90 ° or more and 150 ° or less by performing a surface treatment of the die. 15. The method for producing an optical substrate according to any one of 15 above.

  According to the present invention, by making the cross section of the optical wiring into a circular approximate shape, it is advantageous for suppressing light loss at the time of joining with an optical component such as an optical fiber or a light receiving and emitting element, and the cross section has a circular approximate shape. Since the optical wiring is bonded to the clad, the optical wiring is hardly peeled off from the clad, and even if the optical wiring is peeled off from the clad, it has a cylindrical approximate concave portion on the clad, so that it is not easily displaced from a predetermined position. Therefore, the end face of the optical wiring is easily processed and mounted.

Next, embodiments of the present invention will be described with reference to the drawings.
The approximate circle shape described in this specification is a figure surrounded by a substantially circular curve, and includes a circle. Further, the cylinder approximation refers to a columnar shape having a circular approximate shape as a cross section.
If the cross section of the optical wiring provided in the optical substrate of the present invention has a circular approximate shape, it is possible to suppress the optical loss at the time of joining with the optical component, and the effect is particularly great when the cross section of the optical wiring is a circle. . The portion described below as a cylindrical surface may have a cylindrical approximate shape. In particular, in the method for manufacturing an optical substrate of the present invention, the bottom surface of the recess provided in the mold or cladding filled with the core material is an important element for determining the cross-sectional shape of the optical wiring, and is a cylindrical surface. Is preferred.
First, a method for manufacturing the optical substrate of the present invention shown in FIGS. 1 to 7 will be described.
The process from FIG. 1 will be described in detail.
First, as shown in FIG. 1A, a flat surface 10A and a concave portion 10B formed on the flat surface 10A are provided. The concave portion 10B is a semicircular shape formed with a radius the same as the radius of the core 20. The bottom surface 10 </ b> C is formed of a cylindrical surface, and the dimension between the lowermost portion of the bottom surface 10 </ b> C and the flat surface is the same as the diameter of the core 20 or slightly larger than the diameter of the core 20. A mold 10 is prepared.
Next, as shown in FIG. 1B, a core 20 having a circular cross section is formed by raising and filling the core material into the recess 10B.
Next, as shown in FIG. 1C, the clad 30 is formed on the flat surface 10 </ b> A and the recess 10 </ b> B, and the clad 30 and the core 20 are joined. The clad can be formed by applying or laminating a liquid or film clad material on the flat surface 10A and the recess 10B. A clad material is used which is deformed following the outer peripheral surface (cylindrical surface) of the cylindrical optical wiring (core 20) and has a plasticity that can be joined to the optical wiring.
Next, as shown in FIG. 1D, the optical substrate is obtained by separating the mold 10 from the clad 30 to which the core 20 is bonded.
In addition, when the mold 10 is surface-treated, not only can the optical wiring be formed into a more preferable cylindrical shape, but also the mold can be easily released from the mold.
That is, the optical substrate of the present invention is supported by the clad 30 by joining the optical wiring formed of the core 20 having a circular cross section to the clad 30, and the ridge type light whose upper part of the core 20 is exposed to the atmosphere. It is configured as a substrate.
More specifically, as shown in FIG. 1 (d), the clad 30 has a flat surface 30A, and a convex portion 30B extends on the surface 30A, and the convex portion 30B extends at the tip of the convex portion 30B. A cylindrical surface 30 </ b> C is formed along the existing direction, and a part of the outer periphery of the core 20 is joined to the cylindrical surface 30 </ b> C and supported by the clad 30. That is, the clad 30 has a cylindrical surface 30 </ b> C that is joined to a part of the outer peripheral surface of the core 20.
Further, the bottom of the cylindrical surface 30C is located on the same plane as the flat surface 30A of the clad 30, or is located above the surface 30A (in the direction opposite to the clad 30).
1 and FIG. 2 to FIG. 7 described below, the core 20 is more stabilized by the clad 30 as the joining area where the outer peripheral surface (cylindrical surface) of the core 20 and the cylindrical surface 30C of the clad 30 are joined is larger. It is preferable that it is held. For example, it is preferable that 1/2 or more of the area of the outer peripheral surface (cylindrical surface) of the core 20 is bonded to the cylindrical surface 30 </ b> C of the cladding 30.

Next, the process of FIG. 2 will be described in detail.
As shown in FIG. 2A, the flat surface 10 </ b> A and the concave portion 10 </ b> B formed on the flat surface 10 </ b> A are formed, and the concave portion 10 </ b> B is a semicircular cylindrical surface formed with a radius the same as the radius of the core 20. A mold having a bottom surface 10C made of the same and having a dimension between the lowermost part of the bottom surface 10C and the flat surface 10A equal to the diameter of the core 20 or slightly larger than the diameter of the core 20. 10 is prepared.
Next, as shown in FIG. 2B, a core 20 having a substantially circular cross section is formed by raising and filling the core material into the recess 10B.
Next, as shown in FIG. 2C, the core 20 is clad 30 by pressing the mold 10 and the core 20 formed on the mold 10 against the surface of the clad 30 formed on the plate-like support medium 50. An optical substrate is obtained by bonding to the substrate. In other words, a laminated body of the support medium 50 and the cladding material is prepared, and the optical substrate is formed by transferring the core 20 onto the cladding material. A clad material is used which is deformed following the outer peripheral surface (cylindrical surface) of the cylindrical optical wiring (core 20) and has a plasticity that can be joined to the optical wiring.
Next, as shown in FIG. 2D, the optical substrate is obtained by separating the mold 10 from the core 20 and the clad 30. In addition, when the mold 10 is surface-treated, not only can the optical wiring be formed into a more preferable cylindrical shape, but also the mold can be easily released from the mold.
That is, the optical substrate of the present invention is supported by the clad 30 by joining the optical wiring formed of the core 20 having a circular cross section to the clad 30, and the ridge type light whose upper part of the core 20 is exposed to the atmosphere. It is configured as a substrate.
More specifically, as shown in FIG. 2D, the clad 30 has a flat surface 30A, a recess 30D is formed on the surface 30A, the recess 30D is formed by a cylindrical surface 30C, and the core 20 A part of the outer periphery is joined to the cylindrical surface 30C and supported by the clad 30.

More specifically, the depth of the concave portion 10B included in the mold 10 may be such that the core 20 can have a cylindrical approximate shape when the core material is raised and filled in the concave portion 10B.
When the dimension between the lowermost part of the bottom surface 10C of the recess 10B of the mold 10 and the flat surface 10A is smaller than the diameter of the core 20, it is formed by using a dispenser, an ink jet method or the like to form the core material while raising it. It is preferable to do this.
In other words, the depth of the recess 10B of the mold 10 for making the core 20 may be smaller than the diameter of the core 20, and in that case, the core material is filled into the recess 10B with a dispenser or an ink jet. By doing so, the core 20 can be formed using the surface tension of the core material.
In particular, when the dimension between the lowermost part of the bottom surface 10C of the recess 10B of the mold 10 and the flat surface 10A is smaller than the radius of the core 20, it requires considerable care to form the core material while raising it. In this case, since the cylindrical surface 30C of the cladding 30 covers more than half of the outer peripheral surface (cylindrical surface) of the optical wiring, the junction area increases, and the optical wiring is stably held by the cladding 30.
When the dimension between the lowermost part of the bottom surface 10C of the recess 10B of the mold 10 and the flat surface 10A is the same as the diameter of the core 20 or slightly larger than the diameter of the core 20, the core material is filled into the recess 10B. For example, it can be easily performed by applying a liquid core material to the entire surface of the mold and scraping the flat surface 10A with a doctor.
The contact angle of the core material with respect to the mold 10 is preferably equal between the flat surface 10A of the mold 10 and the recess 10B, or the recess 10B is smaller than the flat surface 10A. In particular, in the recess 10B, if the contact angle of the core material is 90 ° or more, the core shape can be made to be a more cylindrical approximate shape when the core material is filled.
Here, if the contact angle is larger than 150 °, the core material may adhere to the doctor side when the core material is filled, which may result in poor filling.
That is, it is preferable that the surface of the mold 10 is subjected to a surface treatment so that the contact angle between the surface of the mold 10 and the core material is 90 ° to 150 °.
The mold 10 (concave mold) for forming the optical wiring into a cylindrical shape is preferably manufactured with a material having good dimensional stability, withstanding the repeated use and having strength not to be defeated by the doctor.
If a light-transmitting material such as glass is used, when a photocurable resin is used as the core material, the curing process can be performed through a mold.
The core material is preferably a material that is liquid when filled into the recess 10B of the mold 10 and can be cured by heat and / or light. A material having a small dimensional change before and after curing is preferred. Photocurable resins are preferred because the thermal history may adversely affect each material constituting the optical substrate, such as deterioration.

Next, the process of FIG. 3 will be described in detail.
First, as shown in FIG. 3A, the flat surface 12A has a flat surface 12A and a convex portion 12B formed on the flat surface 12A. The convex portion 12B is a half formed with a radius the same as the radius of the core 20. The top surface 12C has a circular cylindrical surface, and the dimension between the top of the top surface 12C and the flat surface 12A is the same as the diameter of the core 20 or slightly larger than the diameter of the core 20. A mold 12 is prepared.
Next, as shown in FIGS. 3B and 3C, by pressing the mold 12 against the surface of the clad 30, the flat surface corresponding to the flat surface 12A and the convex portion 12B of the mold 12 is The recess 30D is formed, and then the mold 12 is separated from the clad 30.
Next, as shown in FIG. 3D, the core material is raised and filled in the recess 30D to form a core 20 having a substantially circular cross section, and the optical substrate is bonded to the clad 30 by bonding the core 20 to the clad 30. obtain.
That is, the optical substrate of the present invention is configured as a ridge type optical substrate in which the upper portion of the core 20 is exposed to the atmosphere by bonding the clad 30 to the optical wiring formed from the core 20 having a circular cross section. Yes.
More specifically, as shown in FIG. 3 (d), the clad 30 has a flat surface 30A, and a recess 30D extends and is formed on the surface 30A. The recess 30D is dimensioned to accommodate the core 20. A pair of side surfaces 30E facing each other and a cylindrical surface 30C connecting the lower portions of the pair of side surfaces are formed. The core 20 is accommodated in the recess 30D, and a part of the outer periphery thereof is joined to the cylindrical surface 30C and supported by the clad 30. ing.

Next, the process of FIG. 4 will be described in detail.
First, as shown in FIG. 4B, the flat surface 12 </ b> A has a flat surface 12 </ b> A and a convex portion 12 </ b> B formed on the flat surface 12 </ b> A. The convex portion 12 </ b> B is a half formed with a radius the same as the radius of the core 20. The top surface 12C has a circular cylindrical surface, and the dimension between the top of the top surface 12C and the flat surface 12A is the same as the diameter of the core 20 or slightly larger than the diameter of the core 20. A mold 12 is prepared.
Next, as shown in FIGS. 4A and 4B, the mold 12 is pressed against the surface of the clad 30 formed on the plate-like support medium 50, thereby bringing the flat surface of the mold 12 into the surface of the clad 30. A flat surface corresponding to 12A and the convex portion 12B and a concave portion 30D are formed, and then the mold 12 is separated from the clad 30.
Next, as shown in FIG. 4C, the core material is raised and filled in the recess 30 </ b> D to form a core 20 having a substantially circular cross section, and the core 20 is bonded to the clad 30 to bond the optical substrate. obtain.
That is, the optical substrate of the present invention is configured as a ridge type optical substrate in which the upper portion of the core 20 is exposed to the atmosphere by bonding the clad 30 to the optical wiring formed from the core 20 having a circular cross section. Yes.
More specifically, as shown in FIG. 4C, the clad 30 has a flat surface 30A, a recess 30D is formed on the surface 30A, and the recess 30D is dimensioned to accommodate the core 20. A pair of side surfaces 30E facing each other and a cylindrical surface 30C connecting the lower portions of the pair of side surfaces are formed. The core 20 is accommodated in the recess 30D, and a part of the outer periphery thereof is joined to the cylindrical surface 30C and supported by the clad 30. ing.

Next, the process of FIG. 5 will be described in detail.
First, as shown in FIG. 5A, the flat surface 12A, the plurality of convex portions 12B formed on the flat surface 12A, and the plurality of outer shape partitioning convexes for the outer shape processing of the optical substrate formed on the flat surface 12A. The convex portion 12B has a top surface 12C made of a semicircular cylindrical surface formed with a radius of the same dimension as the radius of the core 20, and the top of the top surface 12C and the flat surface 12A. The dimension between the two is the same as the diameter of the core 20 or slightly larger than the diameter of the core 20, and the dimension between the uppermost portion of the outer partition convex portion 12D and the flat surface 12A. Is prepared with a dimension larger than the dimension between the uppermost part of the top surface 12C and the flat surface 12A.
Next, as shown in FIG. 5B, the flat surface 12 </ b> A and the convex portion of the mold 12 are formed on the surface of the clad 30 by pressing the mold 12 against the surface of the clad 30 formed on the plate-like support medium 50. At the same time as forming the flat surface 12A and the concave portion 30D corresponding to 12B, the clad 30 is separated into a plurality of clad division bodies 30 by the outer-partition convex portions 12D, and then the mold 12 is separated from the clad division body 30.
Next, as shown in FIG. 5C, the core material is raised and filled in the recess 30 </ b> D to form the core 20 having a circular approximate cross section, and a plurality of cores 20 are joined to the clad divided body 30. An optical substrate is obtained.
Next, as shown in FIG. 5D, the optical substrate is separated from the support medium 50.
That is, the optical substrate of the present invention is configured as a ridge type optical substrate in which the upper portion of the core 20 is exposed to the atmosphere by bonding the clad 30 to the optical wiring formed from the core 20 having a circular cross section. Yes.
More specifically, as shown in FIG. 5D, the clad 30 has a flat surface 30A, a recess 30D is formed on the surface 30A, and the recess 30D is dimensioned to accommodate the core 20. A pair of side surfaces 30E facing each other and a cylindrical surface 30C connecting the lower portions of the pair of side surfaces are formed. The core 20 is accommodated in the recess 30D, and a part of the outer periphery thereof is joined to the cylindrical surface 30C and supported by the clad 30. ing.

Next, the process of FIG. 6 will be described in detail.
First, as shown in FIG. 6A, the clad forming recess 50A has a plurality of clad forming recesses 50A. The clad forming recess 50A has an outer shape standing from the bottom surface 50B so as to surround the bottom surface 50B. A supporting medium 50 formed from the partitioning convex portion 50C is prepared.
Next, a plurality of claddings 30 are formed by filling the cladding forming recesses 50 </ b> A with a cladding material.
Next, as shown in FIG. 6 (b), the positioning concave portion that engages the flat surface 12A, the convex portion 12B formed on the flat surface 12A, and the contour partition convex portion 50C formed on the flat surface 12A without rattling. 12E, and the convex portion 12B has a top surface 12C composed of a semicircular cylindrical surface formed with a radius of the same size as the radius of the core 20, and the top of the top surface 12C and the flat surface 12A A mold 12 is prepared in which the dimension between them is the same as the diameter of the core 20 or slightly larger than the diameter of the core 20.
Next, the mold 12 is pressed against the surface of the plurality of claddings 30 while the positioning recesses 12E of the mold 12 are engaged with the outer partitioning projections 50C of the support medium 50, so that the flat surfaces of the molds 12 are placed on the surfaces of the claddings 30. A flat surface 12A and a concave portion 30D corresponding to 12A and the convex portion 12B are formed, and the mold 12 is separated from the plurality of clads 30.
Next, as shown in FIG. 6C, the core material is raised and filled in the recess 30 </ b> D to form a core 20 having a substantially circular cross-section, and the core 20 is joined to the clad 30 to form a plurality of light beams. Get the substrate.
Next, as shown in FIG. 6D, the optical substrate is separated from the support medium 50.
That is, the optical substrate of the present invention is configured as a ridge type optical substrate in which the upper portion of the core 20 is exposed to the atmosphere by bonding the clad 30 to the optical wiring formed from the core 20 having a circular cross section. Yes.
Instead of providing the positioning recess 12E in the mold 12, a positioning pin is provided on one of the mold 12 and the supporting medium 50, and a positioning hole that fits the positioning pin is provided on the other, whereby the mold 12 and the supporting medium 50 are connected. You may make it position.
More specifically, as shown in FIG. 6 (d), the clad 30 has a flat surface 30A, and a recess 30D extends and is formed on the surface 30A. The recess 30D is dimensioned to accommodate the core 20. A pair of side surfaces 30E facing each other and a cylindrical surface 30C connecting the lower portions of the pair of side surfaces are formed. The core 20 is accommodated in the recess 30D, and a part of the outer periphery thereof is joined to the cylindrical surface 30C and supported by the clad 30. ing.

Next, the process of FIG. 7 will be described in detail.
First, as shown in FIG. 7B, the clad formation recess 50A has a plurality of clad formation recesses 50A. The clad formation recesses 50A are externally erected from the bottom surface 50B so as to surround the bottom surface 50B and the periphery of the bottom surface 50B. A support medium 50 formed from the partition convex portions 50C is prepared, and a plurality of clads 30 are formed by filling the clad formation concave portions 50A with a clad material.
Next, as shown in FIG. 7A, the flat surface 10A, the plurality of concave portions 10B formed on the flat surface 10A, and the external partitioning convex portions 50C formed on the flat surface 10A are engaged with each other without rattling. The concave portion 10B has a bottom surface 10C composed of a semicircular cylindrical surface formed with a radius having the same dimension as the radius of the core 20, and is provided between the lowermost portion of the bottom surface 10C and the flat surface 10B. Prepare a mold 10 whose dimensions are the same as the diameter of the core 20 or slightly larger than the diameter of the core 20, and fill the respective recesses 10B with the core material so that the cross section is circular. A plurality of approximate-shaped cores 20 are formed.
Next, as shown in FIG. 7C, the mold 10 and the mold 10 are formed on the surfaces of the plurality of clads 30 while engaging the mold positioning recesses 10 </ b> E with the outer-partition projections 50 </ b> C of the support medium 50. The core 20 is joined to the clad 30 by pressing the formed plural cores 20, and a plurality of optical substrates are obtained simultaneously by separating the mold 10 from the plural cores 20 and the plural clads 30.
Next, as shown in FIG. 7D, the optical substrate is separated from the support medium 50.
That is, the optical substrate of the present invention is configured by bonding the clad 30 to the optical wiring formed from the core 20 having a circular cross section.
Instead of providing the positioning recess 10E in the mold 10, a positioning pin is provided in one of the mold 10 and the supporting medium 50, and a positioning hole that fits the positioning pin is provided in the other, whereby the mold 10 and the supporting medium 50 are connected. You may make it position.
More specifically, as shown in FIG. 7D, the clad 30 has a flat surface 30A, a recess 30D is formed on the surface 30A, the recess 30D is formed by a cylindrical surface 30C, and the core 20 A part of the outer periphery is joined to the cylindrical surface 30C and supported by the clad 30.

The optical substrate according to the present embodiment described above has the following effects.
Since the cross-sectional shape of the optical wiring (core 20) is circular, it is possible to reduce connection loss with the light emitting / receiving element and the optical fiber.
Further, since a part of the cylindrical surface of the optical wiring is continuously joined to the cladding 30 in the length direction of the optical wiring, that is, the cylindrical surface 30C of the cladding 30 is joined to the outer peripheral surface (cylindrical surface) of the core 20. Therefore, the bonding area is larger than that in the case where the conventional rectangular columnar optical wiring is bonded to the cladding 30 on one side thereof, and the optical wiring is stably held by the cladding 30 and the optical wiring and the cladding are Separation from 30 is also suppressed.
Even if the optical wiring is peeled off from the clad 30, the clad 30 is formed along the cylindrical surface of the optical wiring, so that the optical wiring is not easily displaced due to the cylindrical surface 30 </ b> C (indentation) of the cladding 30. ing.
Moreover, since the stress at the time of bending is dispersed, the effect that the optical wiring is hardly peeled off can be expected.
Since the optical wiring is stably bonded to the clad 30, it becomes easy to process the end of the core 20. Further, since a part of the optical wiring is joined to the clad 30 and the remaining part is exposed, it is easy to perform post-processing such as oblique cutting of the end face and alignment at the time of mounting, and is also resistant to bending. The advantages of the ridge type optical substrate remain the same.

Moreover, according to the manufacturing method of the optical substrate of this Embodiment demonstrated above, there exist the following effects.
An optical substrate provided with an optical wiring (core 20) having a substantially circular cross section can be manufactured.
An optical substrate in which the bonding area where the outer peripheral surface (cylindrical surface) of the cylindrical optical wiring is bonded to the clad 30 is half or more than the area of the outer peripheral surface (cylindrical surface) of the optical wiring is manufactured. it can.
Since the external processing pattern of the optical substrate can be created using a mold like the optical wiring, the external processing can be easily performed in a short time.
Since the creation of the optical wiring pattern and the creation of the outer shape processing pattern can be performed in the same process, the process can be simplified and the positional accuracy between the outer shape of the optical substrate and the optical wiring pattern can be improved.
In particular, if the concave portion or convex portion for optical wiring and the concave portion or convex portion for external processing are formed in the same mold, the positional accuracy can be greatly improved because displacement due to alignment can be suppressed.

Next, details of the method of manufacturing the optical substrate of the present invention shown in FIGS. 1 to 7 will be further described.
As shown in FIG. 1, in the method for manufacturing an optical substrate of the present invention, an optical wiring pattern (concave portion 10B) on a mold 10 is filled with a core material to form an optical wiring (a core 20 having a circular cross section).
Next, a clad 30 is formed, and the optical wiring 20 and the clad 30 are separated from the mold 10 to manufacture an optical substrate.

Arbitrary organic materials and inorganic materials can be used for the mold 10.
Specifically, acrylic materials, silicone materials, silicon wafers, metal materials, glass materials, and the like can be used, but are not limited thereto. In order to improve the mold release / peelability, a mold release / release layer may be provided on the surface of the mold 10.

The mold 10 can be formed with concavities and convexities of the optical wiring pattern and the outer shape processing pattern.
By using the mold 10 having both patterns, both patterns can be simultaneously formed with high positional accuracy.

  When forming an optical wiring on the mold 10, a concave mold 10 as shown in FIG. 1 is used. Thereby, the optical wiring 20 can be formed in the optical wiring pattern 10B (recessed portion 10B) on the mold 10.

When each pattern is formed on the clad 30, a convex mold 12 as shown in FIG. 3 is used.
Thereby, the optical wiring 20 (core) can be formed in the optical wiring pattern 30 </ b> A (concave portion 30 </ b> D) on the clad 30.

For the clad 30 and the optical wiring 20, generally used polymer materials can be used.
Specifically, a carbonate material, an epoxy material, an acrylic material, an imide material, a urethane material, a silicone material, an organic material mixed with an inorganic filler, and the like can be used. However, the material is not limited thereto. However, it is desirable to use an optical material with a controlled refractive index.

  The clad 30 can be applied and cured with a solution, and a film-like material can also be used.

  Further, in order to facilitate transportation of each member during the manufacturing process, a support medium 50 as shown in FIGS. 2 and 4 can be used.

The support medium 50 is a support medium for manufacturing the optical substrate.
Any material can be used for the support medium 50 according to the purpose. Specifically, a silicon substrate, a glass substrate, a ceramic substrate, a metal mold, an organic material mold, a printed wiring board, an organic material base material, an organic material film, or the like can be used, but is not limited thereto.

As shown in FIG. 6, the convex shape of the outer shape processing pattern can be formed at an arbitrary position on the support medium 50.
The outer shape processing pattern can take an arbitrary shape. Specifically, a circular pin type, a quadrangular prism type, a reflection attenuation type tilted by a minute angle, an optical path conversion structure type tilted by an arbitrary angle, a free structure type, and the like can be used, but are not limited thereto.

When forming the convex mold of the outer shape processing pattern on the support medium 50, the concave / convex mold of the outer shape processing pattern can be used as the alignment reference by forming the same concave mold on the mold 12.
If the outer shape processing pattern is fine and it is difficult to match the irregularities, a separate pin alignment pattern can be created and aligned based on this.

  The present invention will be described below with reference to examples, but the present invention should not be construed as being limited thereto. In the following description, the optical wiring is described as multi-mode, but it is not always necessary to be in multi-mode.

(Example 1)
First, as shown in FIG. 5A, the clad 30 (NTT-AT UV curable epoxy optical waveguide material) was applied on the glass wafer 50 (support medium).

  Next, as shown in FIG.5 (b), the silicone type | mold 12 which has an optical wiring pattern and an external shape processing pattern was pressed, and the clad was hardened by UV irradiation, and the silicone type | mold was peeled.

  Next, as shown in FIG. 5C, a core material (NTT-AT UV curable epoxy optical waveguide material) is applied to the clad optical wiring pattern, and the optical wiring 20 is formed by irradiating with UV. A substrate was obtained.

  Next, as shown in FIG.5 (d), the optical board | substrate was peeled from the glass wafer 50, and each piece was isolate | separated.

  It was confirmed that the external processing pattern was formed with an accuracy of ± 5 microns with respect to the optical wiring pattern.

(Example 2)
First, as shown in FIG. 6A, a clad material (UV-curable epoxy optical waveguide material made by NTT-AT) was applied on a glass wafer 50 having a convex shape of an outer shape processing pattern to form a clad 30.

  Next, as shown in FIG. 6B, the concave / convex mold of the outer shape processing pattern is used as an alignment reference, the silicone mold 12 having the optical wiring pattern and the outer shape processing pattern is pressed against the clad 30, and the clad 30 is formed by UV irradiation. The cured silicone mold 12 was peeled off.

  Next, as shown in FIG. 6C, the optical wiring 20 is formed by applying a core material (UV-curable epoxy optical waveguide material made by NTT-AT) to the optical wiring pattern of the clad 30 and irradiating with UV. An optical substrate was obtained.

  Next, as shown in FIG.6 (d), the optical board | substrate was peeled from the glass wafer 50, and each piece was isolate | separated.

  It was confirmed that the external processing pattern was formed with an accuracy of ± 5 microns with respect to the optical wiring pattern.

(Example 3)
First, as shown in FIG. 7A, a silicone mold 10 having an optical wiring pattern and an external processing pattern is filled with a core (NTT-AT UV-curable epoxy optical waveguide material), and UV irradiation is performed to form the optical wiring 20. Formed.

  Next, as shown in FIG. 7B, a clad 30 (NTT-AT UV-curable epoxy optical waveguide material) was applied on a glass wafer 50 having a convex shape with an outer shape processing pattern.

  Next, as shown in FIG. 7 (c), using the concavo-convex mold of the outer shape processing pattern as an alignment reference, the silicone mold 10 is pressed against the clad 30, and the clad 30 is cured by UV irradiation. Was removed to obtain an optical substrate.

  Next, as shown in FIG.7 (d), the optical board | substrate was peeled from the glass wafer 50, and each piece was isolate | separated.

  It was confirmed that the external processing pattern was formed with an accuracy of ± 5 microns with respect to the optical wiring pattern.

It is explanatory drawing of the manufacturing method of the optical board | substrate of this invention. It is explanatory drawing of the manufacturing method of the optical board | substrate of this invention. It is explanatory drawing of the manufacturing method of the optical board | substrate of this invention. It is explanatory drawing of the manufacturing method of the optical board | substrate of this invention. It is explanatory drawing of the manufacturing method (Example 1) of the optical board | substrate of this invention. It is explanatory drawing of the manufacturing method (Example 2) of the optical board | substrate of this invention. It is explanatory drawing of the manufacturing method (Example 3) of the optical board | substrate of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... type | mold, 12 ... type | mold, 20 ... core, 30 ... clad, 50 ... support medium.

Claims (17)

An optical substrate comprising an optical wiring comprising a core and a clad,
The core has a circular approximate cross section,
The core is supported by the clad by being joined to the clad,
An optical substrate characterized by that. The clad has a cylindrical approximate surface joined to a part of the outer peripheral surface of the core,
The optical substrate according to claim 1. The clad has a flat surface, a convex portion is formed on the surface, a cylindrical approximate surface is formed at the tip of the convex portion along the extending direction of the convex portion, and the core has an outer periphery. Is partly bonded to the cylindrical approximate surface and supported by the clad,
The optical substrate according to claim 1. The bottom of the cylindrical approximate surface is flush with the flat surface of the cladding or above the surface;
The optical substrate according to claim 3. The clad has a flat surface, a recess extends on the surface, the recess is formed by a cylindrical approximate surface, and a part of the outer periphery of the core is joined to the cylindrical approximate surface to form the cladding. Supported by,
The optical substrate according to claim 1. The clad has a flat surface, and a concave portion is formed on the surface. The concave portion connects a pair of side surfaces facing each other and a lower portion of the pair of side surfaces so as to accommodate the core. It is composed of a cylindrical approximate surface, the core is accommodated in the recess, and a part of the outer periphery thereof is joined to the cylindrical approximate surface and supported by the clad,
The optical substrate according to claim 1. A method of manufacturing an optical substrate configured by bonding a clad to an optical wiring formed of a core having a circular cross-sectional shape,
A flat surface and a recess formed in the flat surface, the recess having a bottom surface formed of a semicircular cylindrical approximate surface formed with a radius having the same dimension as the radius of the core, and Providing a mold in which the dimension between the lower part and the flat surface is the same as the diameter of the core or a dimension slightly larger than the diameter of the core;
A step of forming a core having a circular cross section by filling the concave portion with a core material; and
Forming a clad on the flat surface and the recess and bonding the clad and the core;
Separating the mold from the cladding to which the core is bonded;
The manufacturing method of the optical board | substrate characterized by including. A method of manufacturing an optical substrate configured by bonding a clad to an optical wiring formed of a core having a circular cross-sectional shape,
A flat surface and a recess formed in the flat surface, the recess having a bottom surface formed of a semicircular cylindrical approximate surface formed with a radius having the same dimension as the radius of the core, and Providing a mold in which the dimension between the lower part and the flat surface is the same as the diameter of the core or a dimension slightly larger than the diameter of the core;
A step of forming a core having a circular cross section by filling the concave portion with a core material; and
Bonding the core to the clad by pressing the mold and the core formed on the mold against the surface of the clad formed on the plate-shaped support medium;
Separating the mold from the core and the cladding;
The manufacturing method of the optical board | substrate characterized by including. A method of manufacturing an optical substrate configured by bonding a clad to an optical wiring formed of a core having a circular cross-sectional shape,
A flat surface and a convex portion formed on the flat surface, the convex portion having a top surface composed of a semicircular cylindrical approximate surface formed with a radius having the same dimension as the radius of the core, Providing a mold in which the dimension between the top of the top surface and the flat surface is the same as the diameter of the core or a dimension slightly larger than the diameter of the core;
Forming a flat surface and a concave portion corresponding to the flat surface and the convex portion of the mold on the surface of the clad by pressing the die against the surface of the clad; and
Separating the mold from the cladding;
Forming a core having a substantially circular cross section by filling the concave portion with a core material and bonding the core to the clad; and
The manufacturing method of the optical board | substrate characterized by including. A method of manufacturing an optical substrate configured by bonding a clad to an optical wiring formed of a core having a circular cross-sectional shape,
A flat surface and a convex portion formed on the flat surface, the convex portion having a top surface composed of a semicircular cylindrical approximate surface formed with a radius having the same dimension as the radius of the core, Providing a mold in which the dimension between the top of the top surface and the flat surface is the same as the diameter of the core or a dimension slightly larger than the diameter of the core;
Forming a flat surface and a concave portion corresponding to the flat surface of the mold and the convex portion on the surface of the clad by pressing the die against the surface of the clad formed on the plate-shaped support medium;
Separating the mold from the cladding;
Forming a core having a substantially circular cross section by filling the concave portion with a core material and bonding the core to the clad; and
The manufacturing method of the optical board | substrate characterized by including. A method of manufacturing an optical substrate configured by bonding a clad to an optical wiring formed of a core having a circular cross-sectional shape,
A flat surface, a plurality of convex portions formed on the flat surface, and a plurality of contour partition convex portions formed on the flat surface, wherein the convex portions are formed with a radius having the same dimension as the radius of the core. The top surface of the approximated semicircular cylindrical surface, and the dimension between the top of the top surface and the flat surface is the same as the diameter of the core or slightly smaller than the diameter of the core And the dimension between the uppermost part of the convex for partitioning the outer shape and the flat surface is larger than the dimension between the uppermost part of the top surface and the flat surface. A process of preparing a mold,
By pressing the mold against the surface of the clad formed on the plate-like support medium, a flat surface and a concave portion corresponding to the flat surface of the mold and the convex portion are formed on the surface of the clad. A step of separating into a plurality of clad division bodies by the outer shape partitioning convex part;
Separating the mold from the clad segment;
Forming a plurality of optical substrates by joining the core to the clad divided body while forming a core having a substantially circular cross section by raising and filling the core material in the recess; and
Separating the optical substrate from the support medium;
The manufacturing method of the optical board | substrate characterized by including. A method of manufacturing an optical substrate configured by bonding a clad to an optical wiring formed of a core having a circular cross-sectional shape,
A step of providing a support medium formed by a plurality of clad forming concave portions, wherein the clad forming concave portions are formed from a bottom surface and convex portions for external partitioning standing from the bottom surface so as to surround the bottom surface; ,
Filling each clad forming recess with a clad material to form a plurality of clads;
A flat surface and a convex portion formed on the flat surface, the convex portion having a top surface composed of a semicircular cylindrical approximate surface formed with a radius having the same dimension as the radius of the core, Providing a mold in which the dimension between the top of the top surface and the flat surface is the same as the diameter of the core or a dimension slightly larger than the diameter of the core;
Forming a flat surface and a concave portion corresponding to the flat surface and the convex portion of the mold on the surface of the clad by pressing the mold against the surfaces of the plurality of clads;
Separating the mold from the plurality of claddings;
Forming a plurality of optical substrates by joining the core to the clad while forming a core having a substantially circular cross section by raising and filling the core material in the recess; and
Separating the optical substrate from the support medium;
The manufacturing method of the optical board | substrate characterized by including. A method of manufacturing an optical substrate configured by bonding a clad to an optical wiring formed of a core having a circular cross-sectional shape,
A step of providing a support medium formed by a plurality of clad forming concave portions, wherein the clad forming concave portions are formed from a bottom surface and convex portions for external partitioning standing from the bottom surface so as to surround the bottom surface; ,
Filling each clad forming recess with a clad material to form a plurality of clads;
A flat surface, a convex portion formed on the flat surface, and a positioning concave portion that is formed on the flat surface and engages with the external partition convex portion without rattling, and the convex portion has a radius of the core. A top surface comprising a semicircular cylindrical approximate surface formed with a radius of the same dimension, and the dimension between the top of the top surface and the flat surface is the same as the diameter of the core, or Preparing a mold formed with a dimension slightly larger than the diameter of the core;
The flat surface of the mold and the flat surface of the mold are pressed against the surface of the clad by pressing the mold against the surfaces of the plurality of clads while engaging the positioning concave portion of the mold with the convex part for external partition of the support medium. Forming a flat surface and a recess corresponding to the protrusion, and
Separating the mold from the plurality of claddings;
Forming a plurality of optical substrates by joining the core to the clad while forming a core having a substantially circular cross section by raising and filling the core material in the recess; and
Separating the optical substrate from the support medium;
The manufacturing method of the optical board | substrate characterized by including. A method of manufacturing an optical substrate configured by bonding a clad to an optical wiring formed of a core having a circular cross-sectional shape,
A step of providing a support medium formed by a plurality of clad forming concave portions, wherein the clad forming concave portions are formed from a bottom surface and convex portions for external partitioning standing from the bottom surface so as to surround the bottom surface; ,
Filling each clad forming recess with a clad material to form a plurality of clads;
A flat surface and a plurality of recesses formed on the flat surface, the recesses having a bottom surface formed of a semicircular cylindrical approximate surface formed with a radius having the same dimension as the radius of the core; Preparing a mold in which the dimension between the lowermost part and the flat surface is the same as the diameter of the core or a dimension slightly larger than the diameter of the core;
Forming a plurality of cores having a substantially circular cross-section by raising and filling a core material in each of the recesses;
Bonding the core to the cladding by pressing the mold and the plurality of cores formed on the mold against the surfaces of the plurality of cladding;
Obtaining a plurality of optical substrates simultaneously by separating the mold from the plurality of cores and the plurality of clads;
Separating the optical substrate from the support medium;
The manufacturing method of the optical board | substrate characterized by including. A method of manufacturing an optical substrate configured by bonding a clad to an optical wiring formed of a core having a circular cross-sectional shape,
A step of providing a support medium formed by a plurality of clad forming concave portions, wherein the clad forming concave portions are formed from a bottom surface and convex portions for external partitioning standing from the bottom surface so as to surround the bottom surface; ,
Filling each clad forming recess with a clad material to form a plurality of clads;
A flat surface, a plurality of concave portions formed on the flat surface, and a positioning concave portion that is formed on the flat surface and engages the convex portions for external partitioning without rattling, and the concave portion has a radius of the core A bottom surface composed of a semicircular cylindrical approximate surface formed with a radius of the same dimension, and the dimension between the lowermost part of the bottom surface and the flat surface is the same as the diameter of the core, or Preparing a mold formed with a dimension slightly larger than the diameter;
Forming a plurality of cores having a substantially circular cross-section by raising and filling a core material in each of the recesses;
The core is formed by pressing the mold and the plurality of cores formed on the mold against the surfaces of the plurality of clads while engaging the positioning recess of the mold with the outer-partition projection of the support medium. Bonding to the cladding;
Obtaining a plurality of optical substrates simultaneously by separating the mold from the plurality of cores and the plurality of clads;
Separating the optical substrate from the support medium;
The manufacturing method of the optical board | substrate characterized by including.   15. The method of manufacturing an optical substrate according to claim 12, wherein a positioning pin is provided on one of the mold and the support medium, and a positioning hole is provided on the other to fit the positioning pin. The light according to any one of claims 7, 8, 14, and 15, wherein a surface angle of the mold and the core material is set to 90 ° or more and 150 ° or less by performing a surface treatment of the die. A method for manufacturing a substrate.

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