JP2013246397A - Optical unit and manufacturing method of optical unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical unit capable of fixing a sleeve member to a circuit board by welding while optically coupling a photoelectric conversion element to an optical fiber with high accuracy.SOLUTION: An optical unit includes: a circuit board 50 on which a photoelectric conversion element 20 is mounted; a sleeve member 30 fixed to the circuit board 50 and having a sleeve 32 into which a ferrule F attached to the end of an optical fiber F1 is fit; a welding member 60, made of a thermoplastic resin, provided on the circuit board 50 and welded to the sleeve member 30; and a positioning part 38, in the sleeve member 30, which is provided opposite to the circuit board 50 and comes into contact with the circuit board 50 when the welding member 60 is welded to the sleeve member 30.

Description

  The present invention relates to an optical unit and a method for manufacturing the optical unit.

  Conventionally, an optical unit for optically coupling an optical fiber and a photoelectric conversion element is described in Patent Document 1 below. The optical unit includes a photoelectric conversion element mounted on a circuit board, and a sleeve member that is positioned so as to surround the photoelectric conversion element and is fixed to the circuit board. The sleeve member is made of a resin having optical transparency, and includes a sleeve into which a ferrule connected to the end of the optical fiber is fitted, and a resin lens formed integrally with the sleeve. When the ferrule is fitted in the sleeve, the photoelectric conversion element and the optical fiber are optically coupled via the resin lens, and the photoelectric conversion element converts the electrical signal and the optical signal to each other, thereby enabling communication. Done.

JP 2010-224513 A

By the way, in recent years, as a method of fixing the sleeve member to the circuit board on which the photoelectric conversion element is mounted, the sleeve member is placed on the welding member provided on the circuit board and the welding member is irradiated with laser light. Therefore, a method of integrally welding and fixing the welding member and the sleeve member has been studied.
However, when the welding member is melted by irradiating the laser beam and the welding member and the sleeve member are intended to be welded and fixed, the welding member is melted, resulting in a deviation in the height position of the resin lens. It becomes impossible to optically couple the conversion element and the optical fiber with high accuracy.

  The present invention has been completed based on the above-described circumstances, and in an optical unit, a sleeve member is welded and fixed to a circuit board while optically coupling a photoelectric conversion element and an optical fiber with high accuracy. The purpose is to provide technology.

  As means for achieving the above-mentioned object, the present invention is an optical unit, in which a circuit board on which a photoelectric conversion element is mounted and a ferrule fixed to the circuit board and attached to an end of an optical fiber are fitted. A sleeve member provided on the circuit board and made of a thermoplastic resin welded to the sleeve member, and the sleeve member is provided to face the circuit board, and the welding member is the sleeve member. And a positioning portion that comes into contact with the circuit board when it is welded to the circuit board.

  According to the optical unit having such a configuration, the welding member and the sleeve member are welded in a state where the positioning portion and the circuit board are in contact with each other and the sleeve member is positioned in the contact direction with respect to the circuit board. Therefore, the accuracy of the length dimension between the photoelectric conversion element mounted on the circuit board and the end portion of the optical fiber can be increased. Accordingly, the sleeve member can be welded and fixed to the circuit board while optically coupling the photoelectric conversion element and the optical fiber with high accuracy.

According to the present invention, a sleeve member having optical transparency that can be fitted with a ferrule is disposed in contact with a thermoplastic welding member provided on a circuit board, and laser light is transmitted through the sleeve member. The method of manufacturing an optical unit for welding and fixing the welding member and the sleeve member by irradiating to the circuit board side of the sleeve member when the welding member and the sleeve member are welded. The provided positioning portion is in a state of being in contact with the circuit board, whereby the sleeve member is positioned with respect to the circuit board.
According to such a method of manufacturing an optical unit, the sleeve member can be welded and fixed to the circuit board in a state where the positioning member is brought into contact with the circuit board and the sleeve member is positioned in the contact direction with respect to the circuit board. .
Also, in the process of manufacturing the optical unit, for example, when the sleeve member is bonded to the circuit board with an adhesive or the like, handling is complicated such as preventing the applied adhesive from adhering to an unintended place. There is a risk of becoming. However, according to the manufacturing method as described above, the welding member and the sleeve member can be welded by irradiating the welding member with laser light through the sleeve member, so that the welding member is not attached to an unintended place. It is excellent in handling when fixing the sleeve member and is very effective.

The following configuration is preferable as an embodiment of the present invention.
The welding member is formed so as to protrude from the circuit board toward the sleeve member side, and the sleeve member is formed to open to the circuit board side, and the protruding end of the welding member is abutted against the back part. It is good also as a structure provided with the to-be-welded part accommodated in the contacted state, and the said positioning part being formed in the opening edge part of the to-be-welded part.
According to such a configuration, when the protruding end of the welding member and the inner portion of the welded portion are welded, the opening edge of the welded portion comes into contact with the circuit board. While being positioned with respect to the circuit board, it can be easily confirmed that the welding member and the sleeve member are welded.

The sleeve member includes a welded portion that protrudes toward the circuit board side, and the weld member includes a housing portion that accommodates the projecting end of the welded portion in contact with a deep portion. It is good also as composition which has.
According to such a configuration, when the protruding end of the welded portion and the inner portion of the housing portion are welded, the melted welding member can be retained in the housing portion, so that the welding member flows out on the circuit board, It is possible to prevent the welding member from adhering to an unintended place on the circuit board.

The positioning portion may be configured to further contact the welding member.
According to such a configuration, since the positioning portion is also positioned by the welding member, the sleeve member can be reliably positioned and fixed in the contact direction with respect to the circuit board.

The welding member is formed so as to protrude toward the sleeve member, and the sleeve member extends along a direction intersecting a protruding direction of the welding member in a state where the positioning portion is in contact with the circuit board. It is good also as a structure provided with the to-be-welded part arrange | positioned and welded with the said welding member.
According to such a configuration, the sleeve member is positioned in the contact direction with respect to the circuit board before the welding member and the welded portion are welded, and the welded portion and the welded portion intersect with the protruding direction of the welded member. Therefore, it is possible to reliably prevent the sleeve member from being displaced and fixed in the contact direction with respect to the circuit board. Accordingly, the sleeve member can be welded and fixed to the circuit board while optically coupling the photoelectric conversion element and the optical fiber with high accuracy.

A plurality of the welding members may be provided on the circuit board.
According to such a configuration, the sleeve member can be positioned not only in the contact direction with respect to the circuit board but also in a plurality of directions intersecting the contact direction. Thereby, not only the length dimension between a photoelectric conversion element and the edge part of an optical fiber but an optical fiber can be positioned and fixed to an axial direction with respect to a photoelectric conversion element.

Further, in the manufacturing method, the positioning portion may be separated from the circuit board before the welding member is melted, and abuts on the circuit board when the welding member melts. .
According to such a configuration, it is possible to easily confirm that the welding member and the sleeve member are welded by confirming that the positioning portion contacts the circuit board.

  According to the present invention, it is possible to weld and fix the sleeve member to the circuit board while optically coupling the photoelectric conversion element and the optical fiber with high accuracy.

The perspective view of the sleeve member in Embodiment 1. Front view Bottom view FIG. 3 is a cross-sectional view of the optical unit according to Embodiment 1 and corresponds to a cross section cut at the position of the line AA in FIG. 2. 4 is an enlarged cross-sectional view of the main part of FIG. The principal part expanded sectional view which shows the state before the sleeve member and welding member in Embodiment 1 are welded. The perspective view of the sleeve member in Embodiment 2. Front view Sectional drawing of the optical unit in Embodiment 2, Comprising: Sectional drawing corresponded in the cross section cut | disconnected in the position of the BB line of FIG. 9 is an enlarged cross-sectional view of the main part of FIG. The principal part expanded sectional view which shows the state before the sleeve member and welding member in Embodiment 2 are welded. The principal part expanded sectional view equivalent to FIG. 5 in Embodiment 3. FIG.

<Embodiment 1>
Embodiment 1 of the present invention will be described with reference to FIGS.
This embodiment illustrates the optical unit 10 for optically coupling the optical fiber F1 and the photoelectric conversion element 20. As shown in FIG. 4, the optical unit 10 includes a photoelectric conversion element 20 mounted on the upper surface 50 </ b> A of the circuit board 50 and a sleeve member 30 fixed to the circuit board 50 so as to surround the upper part of the photoelectric conversion element 20. It is prepared for.

(Circuit board 50)
A conductive path (not shown) is formed on the circuit board 50 by a printed wiring technique. As shown in FIGS. 4 and 5, the photoelectric conversion element 20 is connected to the conductive path on the upper surface 50 </ b> A of the circuit board 50 by, for example, reflow soldering.
The circuit board 50 is formed with a plurality of attachment holes 51 penetrating the circuit board 50 in the vertical direction, and a welding member 60 is insert-molded and fixed to each attachment hole 51.

(Welding member 60)
Each welding member 60 is made of a thermoplastic resin containing an absorber such as carbon (for example, PEI (polyetherimide resin), PC (polycarbonate resin), PMMA (polymethacrylic acid) so as to easily absorb laser light. Methyl resin) and the like, for example, colored black. 4 and 5, each welding member 60 is formed in a substantially cylindrical shape protruding upward from the upper surface 50A of the circuit board 50. The upper surface of each welding member 60 is a flat circuit board. 50 is a welding surface 61 parallel to 50.

(Photoelectric conversion element 20)
The photoelectric conversion element 20 is formed in a block shape and is either a light receiving type or a light emitting type. An active layer is formed on the photoelectric conversion element 20, and an optical signal is converted into an electric signal or an electric signal is converted into an optical signal in the active layer.

(Sleeve member 30)
The sleeve member 30 is made of at least light-transmitting resin (for example, PEI (polyetherimide resin), PC (polycarbonate resin), PMMA (polymethyl methacrylate resin), etc.) used for optical communication. ing. Here, “light transmittance” means that the light transmittance is 90% or more with respect to a wavelength (for example, 0.4 μm to 2 μm) used in optical communication. As shown in FIGS. 1 to 4, the sleeve member 30 includes a surrounding portion 31 that covers the upper portion of the photoelectric conversion element 20 and a sleeve 32 that is integrally formed on the upper portion of the surrounding portion 31. Configured.

(Enclosure 31)
The surrounding portion 31 has a substantially rectangular shape in a bottom view and is formed in a hood shape that opens downward. The surrounding portion 31 is assembled to the circuit board 50 so as to cover the photoelectric conversion element 20 from above. A plurality of welded portions 33 that can individually accommodate the welding members 60 of the circuit board 50 are formed at positions corresponding to the welding members 60 of the circuit board 50 at the lower opening edge of the surrounding portion 31.

(Welding part 33)
Each welded portion 33 is arranged one by one at the center of three sides of the four sides of the lower opening edge of the surrounding portion 31, and the positions of the welded portions 33 are substantially triangular vertices. It is a triangular arrangement located in the part. Further, the welded portion 33 has a round hole that is recessed upward from the lower end surface of the lower opening edge of the surrounding portion 31, and the welded member 60 is located inside the welded portion 33 from below. It can be inserted. The welded portion 33 has an inner diameter dimension slightly larger than an outer diameter dimension of the welding member 60, and can individually accommodate the welding members 60 with a clearance in the circumferential direction of the welding member 60. ing.

  The depth of the welded portion 33 is a flat welded surface 34 corresponding to the welded surface 61 of the welded member 60. The depth of the welded portion 33 is such that the welded member 60 has the circuit board 50. It is formed to be slightly smaller than the dimension protruding from. For this reason, when the welding member 60 is inserted into the welded portion 33, the welded surface 61 of the welded member 60 and the welded surface 34 of the welded portion 33 are brought into surface contact with each other, and the welded portion 33. Thus, the welding member 60 protrudes slightly. When the welding surface 61 is irradiated with the laser beam L from the outside through the surrounding portion 31 in a state where the welding surface 61 and the welding surface 34 are in contact with each other, the welding surface 61 of the welding member 60 is melted, and the welding surface 61 and the welding surface are welded. The surface 34 is in close contact. The circuit board 50 and the sleeve member 30 are integrally welded and fixed by cooling and curing the welding member 60. The laser used here is, for example, an LD (semiconductor) laser or a general YAG laser (for example, a neodymium-added YAG (Nd-YAG) laser) having a wavelength of 1064 nm.

(Sleeve 32)
The sleeve 32 has a substantially cylindrical shape and is formed to extend upward from the surrounding portion 31. Inside the sleeve 32, there is provided a bottomed accommodating portion 35 into which the ferrule F attached to the end of the optical fiber F1 is fitted. In the center of the bottom wall 35 </ b> A of the housing part 35, an escape hole 36 is provided to prevent interference of the ferrule F fitted in the housing part 35 with the optical fiber F <b> 1.

  Further, a substantially circular convex lens 37 that optically couples the photoelectric conversion element 20 and the optical fiber F <b> 1 is formed integrally with the sleeve 32 at a substantially central portion in the vertical direction of the sleeve 32. The convex lens 37 has a form bulging downward, and is formed such that the axis of the convex lens 37 is coaxial with the axis of the sleeve 32. The convex lens 37 is arranged so that the axis of the convex lens 37 coincides with the photoelectric conversion element 20 of the circuit board 50, and the output light emitted from the photoelectric conversion element 20 is condensed on the optical fiber F 1 in the ferrule F. Or, it plays a role of condensing output light emitted from the optical fiber F <b> 1 to the photoelectric conversion element 20.

(Positioning part 38)
Now, as shown in FIGS. 4 and 5, the lower end surface of the lower opening edge portion of the surrounding portion 31 of the sleeve member 30 is a flat positioning portion 38 parallel to the circuit board 50. That is, the positioning portion 38 is disposed at the opening edge of the welded portion 33.

  In the state before the welding surface 61 of the welding member 60 and the welding surface 34 of the welding portion 33 are welded, the positioning portion 38 is separated from the upper surface 50A of the circuit board 50 as shown in FIG. When the sleeve member 30 is fixed to the circuit board 50, the welding surface 61 of the welding member 60 is melted by the laser light L, and the sleeve member 30 is lowered downward so as to approach the circuit board 50. Thus, as shown in FIG. 5, the upper surface of the circuit board 50 is brought into contact with the upper and lower directions. And the sleeve member 30 is being fixed to the circuit board 50 because the welding member 60 is cooled and hardened | cured in this state. That is, the positioning portion 38 is in contact with the upper surface 50A of the circuit board 50 in the vertical direction (contact direction) in a state in which the sleeve member 30 and the circuit board 50 are integrally welded and fixed. The length dimension between the convex lens 37 and the photoelectric conversion element 20 in a state where the positioning portion 38 is in contact with the upper surface 50A of the circuit board 50 is a regular length most suitable for collecting light by the convex lens 37. It is a dimension.

(Function and effect)
The optical unit 10 of the present embodiment has the above-described configuration. Next, operations and effects when the sleeve member 30 is fixed to the circuit board 50 will be described.
First, a circuit board 50 on which the photoelectric conversion element 20 is mounted and a plurality of welding members 60 are fixed, and a sleeve member 30 are prepared.

  The sleeve member 30 is disposed above the circuit board 50 so that the photoelectric conversion element 20 is covered by the surrounding portion 31 of the sleeve member 30, and each welding member 60 is accommodated in the welded portion 33 of the surrounding portion 31. The sleeve member 30 is placed on the welding member 60. Here, since the protruding dimension of the welding member 60 from the circuit board 50 is formed larger than the depth dimension of the welded portion 33, as shown in FIG. 6, the welding surface 61 and the welded surface of the welding member 60 are welded. The welded surface 34 of the portion 33 comes into surface contact with the positioning portion 38 of the surrounding portion 31 and is separated from the upper surface 50A of the circuit board 50 upward. That is, a gap S is formed between the positioning portion 38 and the upper surface 50A of the circuit board 50.

  In this state, when the laser beam L is applied to the welding surface 61 of the welding member 60 from the outside through the surrounding portion 31, the laser beam L is absorbed by the welding member 60 and the welding surface 61 is melted, as shown in FIG. In addition, the welding surface 61 of the welding member 60 and the welded surface 34 of the welded portion 33 are in close contact with each other. Further, when the melted welding member 60 flows into the clearance C in the welded portion 33, the sleeve member 30 is gradually lowered downward so as to approach the circuit board 50, and the gap S disappears. The positioning portion 38 is in contact with the upper surface of the circuit board 50 in the vertical direction. In this state, the welding member 60 is cooled and cured, and the sleeve member 30 and the circuit board 50 are integrally welded and fixed, whereby the optical unit 10 is completed as shown in FIG.

  By the way, in the optical unit 10 like this embodiment, since the light is condensed by the convex lens 37 in the sleeve 32, the length dimension between the convex lens 37 and the photoelectric conversion element 20 mounted on the circuit board 50. If the length of the convex lens 37 becomes shorter or longer, the focal point of the convex lens 37 is shifted from the position of the photoelectric conversion element 20. For this reason, it is important to fix the sleeve member 30 to a normal height position with respect to the circuit board 50. However, the welding member 60 is melted by the irradiation of the laser light L, and the welding member 60, the sleeve member 30, and the like. When the welding member 60 is integrally welded and fixed, the welding member 60 is melted to cause a deviation in the height position of the convex lens 37, and the length dimension of the photoelectric conversion element 20 and the convex lens 37 is deviated from the normal length dimension. There is a concern that

  However, according to the present embodiment, the welding member 60 melted by irradiating the laser beam L flows into the clearance C in the welded portion 33, and the positioning portion 38 comes into contact with the upper surface of the circuit board 50. The member 30 can be positioned and fixed with respect to the circuit board 50 in the vertical direction (height direction). That is, by making the length dimension between the photoelectric conversion element 20 mounted on the circuit board 50 and the convex lens 37 coincide with the regular length dimension, the length dimension between the photoelectric conversion element 20 and the optical fiber F1. Can be adjusted with high accuracy. That is, the circuit board 50 and the sleeve member 30 can be integrally welded and fixed while optically coupling the photoelectric conversion element 20 and the optical fiber F1 with high accuracy.

  In addition, according to the present embodiment, the portion where the welding surface 61 and the welding surface 34 are welded is covered by the surrounding portion 31, but the positioning portion 38 is in contact with the upper surface of the circuit board 50 and the gap S disappears. By confirming from the outside, the length dimension between the photoelectric conversion element 20 and the convex lens 37 becomes a regular length dimension, and at the same time, the welding surface 61 and the welding surface 34 are in close contact with each other. And can be easily confirmed.

  Further, according to the present embodiment, since the positioning portion 38 is disposed adjacent to the opening edge portion of the welded portion 33, the positioning portion is formed away from the position where the welding surface 61 and the welded surface 34 are welded. Compared to the case, the sleeve member 30 can be reliably positioned and fixed with respect to the circuit board 50 in the height direction.

  Further, according to the present embodiment, since the plurality of welding members 60 and the welded portions 33 are arranged in a triangle, the sleeve member 30 is moved vertically with respect to the circuit board 50 (the positioning portion 38 is placed on the circuit board 50). In addition to the contact direction, the sleeve member 30 can be positioned from three directions that are orthogonal to the vertical direction. That is, the convex lens 37 can be positioned and fixed with respect to the photoelectric conversion element 20 in the axial direction.

  By the way, for example, as a method of fixing the sleeve member to the circuit board, a method of bonding the sleeve member and the circuit board with an adhesive or the like is conceivable, but the sleeve member is fixed to the circuit board using an adhesive. In the case of the method, handling becomes complicated such as preventing the adhesive applied to the circuit board or the sleeve member from adhering to an unintended place.

  However, according to the manufacturing method as described above, the sleeve member 30 and the circuit board 50 can be integrally fixed by irradiating the welding member 60 with the laser beam L from the outside, so that the welding member is not intended. It does not adhere, is excellent in handling before fixing the sleeve member 30, and is very effective.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS.
The optical unit 110 according to the second embodiment is obtained by changing the shapes of the welded portion 33 and the welding member 60 according to the first embodiment, and the configuration, operation, and effect common to the first embodiment are duplicated. Description is omitted. The same reference numerals are used for the same configurations as those in the first embodiment.

As shown in FIGS. 7 to 9, the welded portion 133 in the surrounding portion 31 of the sleeve 130 according to the second embodiment differs from the welded portion 33 in the first embodiment from the lower end surface at the opening edge portion of the surrounding portion 31. Is formed to protrude.
As in the first embodiment, the welded portions 133 are arranged one by one at the center of the three sides of the four sides of the lower opening edge of the surrounding portion 31, and the positions of the welded portions 133 are arranged. Is a triangular arrangement located substantially at the apex of a triangle. The welded portion 133 has a substantially cylindrical shape, and the lower surface of the welded portion 133 is a flat welded surface 134 that is flat and parallel to the circuit board 50.

  On the other hand, the welding member 160 of the second embodiment is completely accommodated in the mounting hole 51 of the circuit board 50, and the upper surface of the welding member 160 is flush with the upper surface of the circuit board 50. An accommodating portion 162 that can accommodate the welded portion 133 is formed at a substantially central portion of the upper portion of the welding member 160. The accommodating portion 162 has a shape that is recessed in a round hole shape downward from the same height position as the upper surface of the circuit board 50, and the inner diameter dimension of the accommodating portion 162 is slightly smaller than the outer diameter dimension of the welded portion 133. Largely formed. When the welded part 133 can be inserted into the housing part 162 from above, the welded part 133 is housed in the housing part 162 with a clearance C in the circumferential direction of the welded part 133. It has become.

  Moreover, the depth dimension of the accommodating part 162 is formed slightly smaller than the protruding dimension of the welded part 133, and the inner part of the accommodating part 162 is flat corresponding to the welded surface 134 of the welded part 133. The welding surface 161 is the same. For this reason, when the welded portion 133 is inserted into the housing portion 162, the welded surface 134 of the welded portion 133 and the welded surface 161 of the housing portion 162 are in surface contact as shown in FIG. Thus, the welded portion 133 slightly protrudes from the accommodating portion 162. Then, in a state where the welding surface 161 and the welding surface 134 are in contact with each other, the welding member 160 is melted by irradiating the welding surface 161 of the housing portion 162 with the laser light L through the surrounding portion 31 from the outside. As shown in FIG. 2, the welding surface 161 and the welding surface 134 are in close contact with each other. Further, the melted welding member 160 flows out into the clearance C and is retained in the accommodating portion 162, and although not illustrated, the positioning portion 38 of the surrounding portion 31 contacts the upper surface 50 </ b> A of the circuit board 50. Further, since the upper surface of the welding member 160 is flush with the upper surface 50 of the circuit board 50, the upper surface of the welding member 160 and the positioning portion 38 come into contact with each other. The circuit board 50 and the sleeve member 130 are integrally welded and fixed by cooling and hardening the welding member 160. That is, since the positioning portion 38 is positioned in the vertical direction also by the upper surface of the welding member 160, the sleeve member 130 can be positioned more reliably with respect to the circuit board 50.

  By the way, when the welding member is melted in a large amount by irradiating the welding member with laser light, if there is no portion for accommodating the molten welding member, the molten welding member flows out on the circuit board 50, and the welding member becomes a circuit. There is a risk of adhering to an unintended location on the substrate 50.

  However, according to the present embodiment, since the melted welding member 160 can be retained in the accommodating portion 162, the welding member 160 can be prevented from adhering to an unintended location on the circuit board 50. ing.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIG.
The optical unit 210 of the third embodiment is obtained by changing the shapes of the welded portion 33 and the welding member 60 in the first embodiment, and the configuration, operation, and effect common to the first embodiment are duplicated. Description is omitted. The same reference numerals are used for the same configurations as those in the first embodiment.

  The welded portion 233 of the third embodiment is different from the welded portion 33 of the first embodiment, and the entire lower end portion of the lower opening edge of the surrounding portion 31 at the position where the welded portion 33 of the first embodiment is formed. Has been. In addition, both inner and outer side surfaces of the welded portion 233 are welded surfaces 234 (inner and outer surfaces at the lower end of the lower opening edge of the surrounding portion 31).

On the other hand, the welding member 260 of the third embodiment is formed so as to protrude upward from the upper surface 50A of the circuit board 50 as in the first embodiment, and is welded so as to sandwich the welded portion 233 from the inner side and the outer side. It is arranged along the part 233.
In the welding member 260, a portion disposed along the welding surface 234 of the welded portion 233 is a welding surface 261, and the welding member 260 is irradiated with the laser light L so that the welding member 260 is welded 233. Is fixed by welding so as to be sandwiched from inside and outside.

  That is, according to the present embodiment, the positioning member 38 is brought into contact with the upper surface 50 </ b> A of the circuit board 50 before the welding member 260 and the welded part 233 are welded, and the sleeve member 230 is moved in the vertical direction with respect to the circuit board 50. Since the welding member 260 and the welded portion 233 can be welded in a state of being positioned in the (contact direction), the sleeve member 230 is displaced in the vertical direction with respect to the circuit board 50 and is fixed by welding. Can be reliably prevented. Thereby, the sleeve member 230 can be welded and fixed to the circuit board 50 while optically coupling the photoelectric conversion element 20 and the optical fiber F1 with high accuracy.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) In the above-described embodiment, the positioning portion 38 is configured in a flat shape parallel to the circuit board 50. However, the present invention is not limited to such a mode. For example, the positioning portion is rounded. You may comprise in a tinged shape or a pointed shape.
(2) In the above embodiment, the welding members 60, 160, and 260 are configured to be black. However, the present invention is not limited to such a mode, and for example, amber or dark gray that easily absorbs laser light. You may comprise.
(3) In the above embodiment, the sleeve 31 is formed in the surrounding portion 31. However, the present invention is not limited to such an embodiment. A pair of sleeves for light emission may be formed.
(4) In the third embodiment, the welded portion 233 is welded by being sandwiched between the inner side and the outer side by the welding member 260, but the present invention is not limited to such an embodiment. Alternatively, the welding member may be disposed orthogonally to the welded part provided at the corner of the part, and the welded member may be welded to the welded part from two orthogonal directions.

10, 110, 210: Optical unit 20: Photoelectric conversion elements 30, 130, 230: Sleeve members 33, 133, 233: Welded portion 38: Positioning portion 50: Circuit boards 60, 160, 260: Welding member 162: Housing portion F: Ferrule F1: Optical fiber L: Laser light

Claims (8)

A circuit board on which a photoelectric conversion element is mounted;
A sleeve member fixed to the circuit board and fitted with a ferrule attached to an end of an optical fiber;
A welding member made of a thermoplastic resin provided on the circuit board and welded to the sleeve member;
An optical unit provided with a positioning portion that is provided in the sleeve member so as to face the circuit board and is in contact with the circuit board when the welding member is welded to the sleeve member. The welding member is formed to protrude from the circuit board toward the sleeve member side,
The sleeve member is formed to be open on the circuit board side, and includes a welded portion that is accommodated in a state in which the protruding end of the welding member is in contact with the inner portion,
The optical unit according to claim 1, wherein the positioning portion is formed at an opening edge portion of the welded portion. The sleeve member includes a welded portion that protrudes toward the circuit board side,
The optical unit according to claim 1, wherein the welding member includes a housing portion that houses the protruding end of the welded portion in contact with a back portion.   The optical unit according to claim 3, wherein the positioning portion further abuts on the welding member. The welding member is formed to protrude toward the sleeve member side,
The sleeve member includes a welded portion that is disposed along a direction intersecting a protruding direction of the welding member and is welded to the welding member in a state where the positioning portion is in contact with the circuit board. Item 4. The optical unit according to Item 1.   The optical unit according to claim 1, wherein a plurality of the welding members are provided on the circuit board. A thermoplastic welding member provided on the circuit board is placed in contact with a sleeve member having optical transparency that can be fitted with a ferrule, and laser light is irradiated to the welding member through the sleeve member. A method of manufacturing an optical unit for welding and fixing the welding member and the sleeve member,
When the welding member and the sleeve member are welded, a positioning portion provided on the circuit board side of the sleeve member is in contact with the circuit board so that the circuit board is in contact with the circuit board. An optical unit manufacturing method for positioning a sleeve member.   The method of manufacturing an optical unit according to claim 7, wherein the positioning portion is separated from the circuit board before the welding member melts, and contacts the circuit board when the welding member melts.

Images