JP4900563B2 - Optical element fixing method and optical element fixing structure manufacturing method - Google Patents

Description

The present invention relates to the production how the optical element fixing method and an optical element fixing structure for adhering and fixing photocurable adhesive optical element to a fixed member.

  Conventionally, when an optical element such as a microlens used in a pickup lens or an optical communication module is bonded and fixed to a fixing member such as a lens barrel, an ultraviolet curable adhesive is applied, and then an ultraviolet ray is applied from an ultraviolet light source. The optical element is fixed to the fixing member by irradiating the agent. Further, it is advantageous that the optical element is made of a resin material for reasons such as lightness and cost.

  However, when the optical element is made of a resin material, according to experiments by the present inventors, light such as ultraviolet rays is irradiated for a certain period of time in order to cure a photocurable adhesive such as an ultraviolet curable adhesive. On the other hand, it has been found that if an optical element is irradiated with ultraviolet rays for 10 seconds or longer, the temperature of the optical element rises considerably and adverse effects such as deformation of the lens surface of the optical element occur.

In view of the above-described problems of the prior art, the present invention is an optical that can suppress adverse effects such as temperature rise on an optical element even when the optical element is irradiated with light for adhesive fixation with a photocurable adhesive. and to provide a device manufacturing how the fixing method and an optical element fixing structure.

In order to achieve the above object, a first optical element fixing method according to the present invention is an optical element fixing method in which an optical element is bonded and fixed to a fixing member with a photocurable adhesive, and the optical element is bonded and fixed. When the photocurable adhesive is irradiated with light after applying the photocurable adhesive to at least one of the adhesive fixing portion of the fixing portion and the fixing member, the region does not participate in the curing of the photocurable adhesive A light source device that does not generate light of a wavelength of is used, a load is applied to the adhesive fixing portion through a load jig having a characteristic of transmitting light generated from the light source device, and the light irradiation is performed through the load jig. It is characterized by performing .

  According to the first optical element fixing method, when the light source device is irradiated with light from the light source device for curing the adhesive to the photocurable adhesive applied to the adhesive fixing portion, the light source device is made of the photocurable adhesive. Since light having a wavelength in a region not involved in curing is not generated, adverse effects such as a temperature rise in the optical element due to light having a wavelength in a region not involved in curing can be suppressed.

  In the optical element fixing method, the light source device can effectively suppress adverse effects such as a temperature rise by generating light having a wavelength within a predetermined region involved in the curing of the photocurable adhesive.

A second optical element fixing method according to the present invention is an optical element fixing method in which an optical element is bonded and fixed to a fixing member with a photocurable adhesive, and includes an adhesive fixing portion of the optical element and an adhesive fixing of the fixing member. the photocurable adhesive to at least one of parts after applying during irradiating light to the photocurable adhesive, the light of a specific wavelength in a predetermined area to participate in the curing of the photocurable adhesive A light source device that generates light is applied, a load is applied to the adhesive fixing portion through a load jig having a characteristic of transmitting light generated from the light source device, and the light irradiation is performed through the load jig. And

  According to the second optical element fixing method, when the light source device is irradiated with light from the light source device for curing the adhesive to the photocurable adhesive applied to the adhesive fixing portion, the light source device is made of the photocurable adhesive. Since light having a specific wavelength within a predetermined region involved in curing is generated, adverse effects such as a temperature rise in the optical element due to light having a wavelength in a region not involved in curing can be suppressed.

  In the first and second optical element fixing methods, the light source device preferably generates light having a specific wavelength within a wavelength range of 300 to 500 nm.

  Moreover, light irradiation can be performed efficiently by disposing a light restricting portion that restricts light so that light is not applied to portions other than the adhesive fixing portion during the light irradiation.

  Further, by applying a load to the adhesive fixing portion when performing the light irradiation, the thickness of the adhesive layer can be made uniform, and the adhesive strength and adhesive characteristics are also stabilized. In this case, when the light irradiation is performed, a load can be applied to the adhesive fixing portion via a load jig.

Further , an adhesive is obtained by roughening at least one surface of the adhesive fixing portion of the optical element and the adhesive fixing portion of the fixing member by a surface roughness treatment method such as blasting, cutting, laser light irradiation, plasma processing, or chemical treatment. Can be applied uniformly, the thickness of the adhesive can be made uniform, and the adhesive shear strength can be increased. Further, the irradiation light from the light source device can be incident from the upper surface of the load jig and a load can be applied through the load jig.

  Further, the load jig has a characteristic of transmitting light generated from the light source device, and the light irradiation can be performed through the load jig. In this case, since the load jig has an optical waveguide portion that guides light to the adhesive fixing portion during the light irradiation, it is possible to perform efficient light irradiation and promote curing of the adhesive.

  In addition, by performing the light irradiation after positioning the light source device with the positioning member with respect to the fixing member and the optical element, the position of the light source can be stabilized, and light irradiation with good reproducibility can be realized. The fixing member can be bonded and fixed with a certain high quality.

  The manufacturing method of the optical element fixing structure according to the present invention includes the optical element fixing structure in which the optical element is bonded and fixed to the adhesive fixing portion of the fixing member at the adhesive fixing portion. Thus, the optical element is manufactured by being fixed to the fixing member.

  According to this method for manufacturing an optical element fixing structure, when light is radiated from a light source device for curing an adhesive to a photocurable adhesive applied to an adhesive fixing portion, the light source device is a photocurable adhesive. Since no light having a wavelength in a region not involved in curing is generated, adverse effects such as a temperature rise in the optical element due to wavelength light in a region not involved in curing can be suppressed, and as a result, the optical element can be stably and reliably attached to a fixing member. Can be glued and fixed to.

  The manufacturing method of the optical element fixing structure is preferably applied when the optical element fixing structure is a structure for performing the light irradiation through the optical element with respect to the adhesive fixing portion. For example, the present invention is preferably applied to an optical element fixing structure in which an optical element is fixed inside a non-light-transmitting fixing member and light can be irradiated only through the optical element to the adhesive fixing portion.

  The optical communication module according to the present invention is characterized in that the optical element is fixed to the fixing member by the optical element fixing structure according to the manufacturing method described above.

  According to this optical communication module, since the optical element can be stably and reliably bonded and fixed to the fixing member, the stability and certainty of the apparatus can be ensured.

  According to the optical element fixing method and the optical element fixing structure manufacturing method of the present invention, even if the optical element is irradiated with light for adhesion fixation with a photocurable adhesive, adverse effects such as temperature rise on the optical element are suppressed. be able to. Therefore, according to the optical communication module in which the optical element is fixed to the fixing member with the optical element fixing structure, the optical element can be stably and surely adhered and fixed to the fixing member, so that the stability and reliability of the apparatus can be improved. It can be secured.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  <First Embodiment>

  FIG. 1 is a longitudinal sectional view of an essential part showing an arrangement example of a lens fixing structure and a light source device for explaining an optical element fixing method according to a first embodiment.

  The lens fixing structure shown in FIG. 1 is one in which the lens 10 is bonded and fixed to the inner surface 20a of the cylindrical lens barrel 20 with an adhesive.

  The lens 10 has a lens portion 11 having a lens function, an outer peripheral portion 13 that is located on the outer peripheral side of the lens portion 11 and extends to the outermost outer periphery 14 of the lens 10, and protrudes from the outer peripheral portion 13 in a direction substantially parallel to the optical axis p. And a mounting lens 12, and a plastic lens made of a resin for optical elements. The lens part 11 has a convex part 11 a centered on the optical axis p, and a flat surface 11 b on the opposite side of the convex part 11 a extends from the lens part 11 to a part of the outer peripheral part 13. A stress relaxation part can be comprised from the outer peripheral part 13 and the attaching part 12. FIG.

  The mounting portion 12 extends from the outer peripheral portion 13 to the opposite side of the convex portion 11 a so as to form a leg portion in a substantially short cylindrical shape, and the outer periphery facing the inner surface 20 a of the lens barrel 20 is the outermost outer periphery 14 of the lens 10. Configure. The tip of the mounting portion 12 is formed on the mounting surface 15 in a direction orthogonal to the optical axis p. In addition, a chamfered portion 16 is formed by chamfering a corner portion at the upper portion of the outermost outer periphery 14 in the figure.

  The lens barrel 20 has a holding portion 21 that protrudes in a collar shape in a direction orthogonal to the optical axis p from the inner surface 20a thereof (inward in the radial direction of the lens barrel 20). The mounting surface 15 of the mounting portion 12 of the lens 10 faces the holding surface 22 of the lens 10.

  The lens barrel 20 is made of an iron / nickel / cobalt alloy (for example, trade name “KOVAL”) and is plated with Ni or Cr. The lens barrel 20 may be made of other metal materials such as steel, stainless steel, aluminum, and aluminum alloy. The entire surface of the colored holding surface 22 plated in the holding portion 21 of the lens barrel 20 of FIG. 1 is roughened by sandblasting.

  A process of bonding and fixing the lens 10 to the lens barrel 20 will be described. First, a liquid photocurable adhesive is applied to the holding surface 22 of the lens barrel 20. As this photocurable adhesive, an epoxy type or acrylic type is preferable.

  Next, the lens 10 is inserted into the lens barrel 20 from above in FIG. 1 with the mounting portion 12 facing down, and placed on the holding surface 22. Thereby, an adhesive layer 29 is formed between the mounting surface 15 and the holding surface 22. Note that a liquid adhesive may be applied in advance to the attachment portion 12 of the lens 10.

  Next, the lens 10 is irradiated with irradiation light a having a single wavelength within a predetermined region from the nozzle 30a of the light source device 30 disposed above the lens 10 in FIG. Here, the predetermined region is involved in the curing of the photocurable adhesive as described above, for example, in the range of 300 to 500 nm, preferably 350 to 450 nm, and the light source device 30 is a photocurable adhesive as described above. Irradiation light a having a specific wavelength (for example, wavelength 365 nm) within a predetermined region involved in curing of the light is generated, and light having a wavelength in a region (for example, light having a wavelength of 300 nm or less) not involved in curing of the photocurable adhesive is generated. Does not occur.

  By irradiating the lens 10 with the irradiation light a, the irradiation light a is applied to the adhesive layer 29 between the mounting surface 15 and the holding surface 22 mainly through the outer peripheral portion 13 and the mounting portion 12 of the lens 10. Thus, the adhesive layer 29 is cured.

  As described above, the lens 10 can be bonded and fixed to the lens barrel 20, but the irradiation light a from the light source device 30 is ultraviolet light having a single wavelength of 365 nm, and the adhesive layer 29 is photocured. Therefore, it does not include light having a wavelength (for example, a wavelength of 300 nm or less) that is unnecessary and causes a temperature rise, so that a temperature rise due to light irradiation in the lens 10 can be suppressed.

  Further, in the lens fixing structure shown in FIG. 1, the lens barrel 20 as a fixing member is made of a metal material and is not light-transmitting, and the lens 10 is fixed to the inner surface of the lens barrel 20, and the outermost periphery 14 of the lens 10 In this structure, the irradiation light cannot be irradiated from the side surface of the lens barrel 20 or the holding portion 21 side of the lens barrel 20, and light can be irradiated only through the lens 10 to the attachment surface 15 and the holding surface 22 which are adhesive fixing portions. The optical element fixing method according to the present embodiment is preferably applied to such a lens fixing structure, and even if the lens 10 is irradiated with irradiation light, adverse effects such as temperature rise can be suppressed.

  Further, at the time of the above-described light irradiation, by arranging the sheet-shaped light shielding member 32 so as to cover the convex portion 11a of the lens portion 11 of the lens 10 as shown by the broken line in FIG. Since no light is applied to the light, the irradiation light can be irradiated efficiently.

  As described above, when the adhesive is applied to the holding surface 22 of the lens barrel 20, the holding surface 22 that is the bonding surface is roughened, so that the adhesive spreads more than the plating surface before the spread of the adhesive is roughened. As a result, the thickness of the adhesive layer 29 can be controlled uniformly. In addition, it is preferable to irradiate the lens 10 with irradiation light while applying a load in the thickness direction of the adhesive, whereby the thickness of the adhesive layer 29 can be made constant, and the adhesive strength and adhesive characteristics are also stable. To do.

  <Second Embodiment>

  FIG. 2 to FIG. 5 are main part longitudinal sectional views schematically showing a lens fixing structure and a load jig for explaining each optical element fixing method according to the second embodiment.

  In the optical element fixing method according to the second embodiment, the load jig is made of a light transmitting material, and the load jig irradiates the irradiation light while applying a load in the thickness direction of the adhesive via the lens. It is. 2 to 4 are substantially the same as the lens 10 shown in FIG. 1, and therefore, the same portions are denoted by the same reference numerals and description thereof is omitted.

  In the example shown in FIG. 2, a cylindrical lens barrel 40 has a holding portion 41 formed at the lower portion so as to protrude in a color shape in a direction perpendicular to the optical axis p. This is a lens fixing structure in which the mounting surface 15 of the mounting portion 12 of the lens 10 is oppositely bonded and fixed to the surface 42. The lens barrel 40 is made of the same metal material as the lens barrel 20 of FIG.

  In FIG. 2, a load is applied via a load jig 45 in the thickness direction of the adhesive layer 49 between the mounting surface 15 of the lens 10 and the holding surface 42 of the lens barrel 40. The load jig 45 is made of a general glass material (BK7) in a cylindrical shape, and is placed on the outer peripheral portion 13 of the lens 10 so that a load is applied from the upper surface 45a side. The load jig 45 has a concave portion 46 formed on the lower surface 45 b side corresponding to the convex portion 11 a of the lens 10, and the lower surface 45 b can be in close contact with the outer peripheral portion 13 of the lens 10.

  A process of bonding and fixing the lens 10 to the lens barrel 40 using the load jig 45 will be described. First, a liquid epoxy or acrylic photocurable adhesive is applied to the holding surface 42 of the lens barrel 40.

  Next, the lens 10 is inserted into the lens barrel 40 from the upper side of FIG. Thereby, an adhesive layer 49 is formed between the mounting surface 15 and the holding surface 42. Note that a liquid adhesive may be applied in advance to the attachment portion 12 of the lens 10.

  Next, as shown in FIG. 2, the load jig 45 is placed on the outer peripheral portion 13 on the upper surface of the lens 10, and a specific wavelength (for example, wavelength 365 nm) within a predetermined region related to the curing of the photocurable adhesive similar to that in FIG. 1. ) Is irradiated in the light irradiation direction b, the irradiation light is incident from the upper surface 45a of the load jig 45, and a load is applied to the load jig 45 to attach the lens 10 to the lens barrel 40. By pressing against the holding surface 42, a load is applied in the thickness direction of the adhesive layer 49.

  The load jig 45 made of the above-mentioned general glass material has a thickness of 2.6 mm, for example, and when irradiated with light with a wavelength of 365 nm from the light source device through the load jig 45, it is 80% or more with respect to the light with a wavelength of 365 nm. Therefore, the adhesive layer 49 can be irradiated with light sufficient for photocuring of the adhesive layer 49.

  By the light irradiation to the load jig 45 described above, the irradiation light incident from the upper surface 45a of the load jig 45 passes through the outer peripheral portion 13 and the mounting portion 12 of the lens 10 from the lower surface 45b, and the adhesive between the mounting surface 15 and the holding surface 42. By irradiating the layer 49, the adhesive layer 49 is cured.

  As described above, the lens 10 can be bonded and fixed to the lens barrel 40 by irradiating the adhesive layer 49 with the irradiation light having a wavelength of 365 nm, for example, from the light source device through the load jig 45. The light is a single wavelength having a specific wavelength (365 nm), and does not include light having a wavelength (for example, a wavelength of 300 nm or less) that is unnecessary for photocuring of the adhesive layer 29 and causes a temperature rise. In addition to being able to suppress the temperature rise caused by light irradiation in the load jig 45, the load jig 45 can transmit light having a wavelength of 365 nm required for photocuring of the adhesive layer 49 by 80% or more, so that the adhesive layer 49 is sufficiently cured. Can do.

  Further, by applying a load in the thickness direction of the adhesive layer 49 through the load jig 45 and the lens 10 during the light irradiation, the thickness of the adhesive layer 49 can be made constant, and the adhesive strength and adhesion can be increased. The characteristics are also stable.

  In the lens fixing structure shown in FIG. 2, the lens barrel 40 as a fixing member is made of a metal material and is not light transmissive. The lens 10 is fixed to the inner surface of the lens barrel 40, and the outermost periphery 14 of the lens 10. In this structure, irradiation light cannot be irradiated from the side surface of the lens barrel 20 or the holding portion 41 side of the lens barrel 20, and light can be irradiated only through the lens 10 to the mounting surface 15 and the holding surface 42 which are adhesive fixing portions. The optical element fixing method according to the present embodiment is preferably applied to such a lens fixing structure, and even if the lens 10 is irradiated with irradiation light, adverse effects such as temperature rise can be suppressed.

  As in FIG. 1, it is preferable to roughen the holding surface 42 of the lens barrel 40. When the adhesive is applied to the holding surface 42, the spread of the adhesive is improved and the thickness of the adhesive layer 29 is increased. It becomes easy to control equally.

  Next, the example of FIG. 3 will be described. FIG. 3 is the same as FIG. 2 except that the reflecting surface 46a is formed on the concave surface of the concave portion 46 of the load jig 45 of FIG. The reflective surface 46a can be formed by vapor deposition or the like from a metal material such as nickel, aluminum, or chromium.

  As in FIG. 2, when irradiation light is irradiated onto the adhesive layer 49 through the load jig 45 in the light irradiation direction b from the same light source device as in FIG. 1, the irradiation light incident on the load jig 45 is reflected on the reflecting surface 46 a of the recess 46. Therefore, the irradiation light is restricted from traveling from the concave portion 46 to the lens portion 11 of the lens 10, and enters the lens 10 toward the lower surface 45 b in the arrow direction c of FIG. 3. For this reason, the amount of irradiation light is increased by the amount reflected by the reflecting surface 46a, and the adhesive layer 49 is efficiently irradiated. Therefore, curing of the adhesive can be promoted, and the light irradiation time can be shortened.

  Next, the example of FIG. 4 will be described. 4 is different from FIG. 3 in that a reflection surface 47 is formed on the outer peripheral surface of the load jig 45 in addition to the reflection surface 46a of the load jig 45 of FIG. . The reflecting surface 47 can be formed by vapor deposition or the like from a metal material such as nickel, aluminum, or chromium.

  As in FIG. 2, when irradiation light is irradiated onto the adhesive layer 49 through the load jig 45 in the light irradiation direction b from the same light source device as in FIG. 1, the irradiation light incident on the load jig 45 is reflected on the reflecting surface 46 a of the recess 46. In addition to being reflected by the reflection surface 47 of the outer peripheral surface, the irradiated light is guided to the lower surface 45b in the arrow direction d in the figure and enters the lens 10. For this reason, the irradiation light is more than the amount reflected by the reflection surface 46a and the reflection surface 47 and guided to the lower surface 45b, and is efficiently irradiated to the adhesive layer 49. Can be shortened.

  Next, the example of FIG. 5 will be described. FIG. 5 is different from FIG. 3 in that the lens 50 to be bonded and fixed does not have the attachment portion 12 extending in a leg shape like the lens 10 described above and has a general substantially cylindrical shape. Other than that, it is the same as FIG. The lens 50 includes a convex portion 51 protruding from the flat upper surface 52, and the outer peripheral surface side of the flat lower surface 53 faces the holding surface 42 of the lens barrel 40. An adhesive layer 59 is formed between the outer peripheral surface.

  The load jig 45 in FIG. 5 is configured in the same manner as in FIG. 3, and enters the load jig 45 when irradiating the adhesive layer 59 through the load jig 45 in the light irradiation direction b from the same light source device as in FIG. Since the irradiated light is reflected by the reflecting surface 46a of the concave portion 46, the irradiation light is restricted from traveling from the concave portion 46 to the convex portion 51 of the lens 50, and is directed to the lower surface 45b in the arrow direction c of FIG. To do. For this reason, since irradiation light is not irradiated to the convex part 51, while deterioration of the convex part 51 can be prevented, irradiation light increases more only by the part reflected by the reflective surface 46a, and since the adhesive bond layer 59 is irradiated efficiently. Adhesive curing can be promoted and the light irradiation time can be shortened.

  As described above, the substantially cylindrical lens 50 can be bonded and fixed to the holding surface 42 of the lens barrel 40 with the adhesive layer 59, but in the case of FIG. 5 as well, the lens is attached to the lower surface 53 and the holding surface 42 which are adhesive fixing portions. The optical element fixing method of FIG. 5 is preferably applied to such a lens fixing structure, and the lens 50 is irradiated with irradiation light for curing the adhesive layer. However, adverse effects such as temperature rise can be suppressed.

  <Third Embodiment>

  FIG. 6 is a longitudinal sectional view of a main part schematically showing a lens fixing structure and a load jig / nozzle / positioning member of a light source device for explaining an optical element fixing method according to a third embodiment.

  In the example of FIG. 6, when the lens fixing structure of FIG. 3 is obtained with the load jig of FIG. 3, the tip nozzle 61 of the light source device is fixed and positioned with respect to the lens barrel 40, the lens 10, and the load jig 45. It is what.

  As shown in FIG. 6, the positioning member 62 has a cylindrical shape and has a mounting portion 62a protruding in a collar shape at the bottom, and the light source device has a nozzle 61 having an inner hole 61a. Irradiation light is irradiated in the light irradiation direction b of FIG. 6 through 61a, and the tip of the nozzle 61 is inserted into the inner peripheral surface 62b of the positioning member 62 from above in the figure.

  As shown in FIG. 6, the lens barrel 40 is disposed on the inner peripheral surface 62b in a state where the positioning member 62 is stably placed on the work table 65 by the placement portion 62a, and the lens barrel 40 is held. After the liquid adhesive is applied on the surface 42, the lens 10 is placed, and the load jig 45 is disposed on the lens 10. Then, after the cylindrical auxiliary member 63 is arranged around the load jig 45 in the inner peripheral surface 62 b, the nozzle 61 of the light source device is inserted into the inner peripheral surface 62 b of the positioning member 62. As a result, the nozzle 61 of the light source device is positioned relative to the cylindrical auxiliary member 63 and the lens barrel 40, and as a result, positioned relative to the load jig 45 and the lens 10.

  In the arrangement as shown in FIG. 6, the irradiation light is irradiated from the light source device through the inner hole 61 a of the nozzle 61 in the light irradiation direction b, so that the adhesive layer 29 is irradiated through the load jig 45 and the lens 10 as in FIG. 3. Thus, the adhesive layer 29 is cured.

  According to the optical element fixing method using the positioning member 62 as shown in FIG. 6, the nozzle 61 of the light source device is positioned and fixed by the positioning member 62, and the lens barrel 40, the lens 10, and the load jig 45 are connected to the nozzle. Since the light source device is positioned and fixed integrally with respect to 61, the light source device can be stably positioned and can be irradiated with light with high reproducibility, and the lens 10 is bonded and fixed to the lens barrel 40 with an adhesive layer 49 with a certain high quality. be able to.

  In the first to third embodiments, the lenses 10 and 50 may be plastic lenses made of various resin materials. FIG. 7 shows the light transmission characteristics of three types of resin materials (PC, APL, and PMMA). As shown, the light transmittance of each resin material is considerably reduced at a wavelength of 300 nm or less, and in particular, it is found that it becomes almost zero in PC and APL. The fact that the light transmittance is almost zero means that light of that wavelength is almost absorbed, and the resin material generates heat due to the energy of the absorbed light. On the other hand, the photocurable adhesive is cured with light having a wavelength in the range of 300 to 500 nm.

  From the above, in the first to third embodiments, the light source device 30 generates irradiation light having a specific wavelength (for example, wavelength 365 nm) within a predetermined region involved in the curing of the photocurable adhesive, By not generating light of a wavelength in a region (for example, light having a wavelength of 300 nm or less) that is not involved in the curing of the photocurable adhesive, heat generation of the lenses 10 and 50 can be effectively suppressed, and a wavelength of 300 to 500 nm. The adhesive layers 29, 49, 59 can be efficiently cured by transmitting light within the range.

  <Fourth embodiment>

  Next, an optical communication module using the lens fixing structure shown in FIG. 1 as a fourth embodiment will be described with reference to FIG. FIG. 8 is a schematic view of the inside of a bidirectional optical communication module according to the fourth embodiment as viewed from the side.

  As shown in FIG. 8, the bidirectional optical communication module 70 includes a plastic lens 74 disposed in a cylindrical case 71 made of a metal such as steel or Kovar (trade name). A hollow cylindrical holding body 72 is attached to the left end of the optical fiber 73, and an optical fiber 73 is inserted therethrough. The optical fiber 73 is connected to the optical communication system so that it can propagate an optical signal transmitted to and received from another terminal, emits the received light b1 and enters the transmitted light b0 at its end face 73a. It has become.

  Further, a substrate 77 is attached to the right end of the case 71 in the drawing, and a light receiving element 78 made of a photodiode and a light emitting element unit 79 are attached to the inner surface of the substrate 77. The light emitting element unit 79 is formed by integrally assembling a light emitting element 79a, which is a semiconductor laser, and a glass lens 79b. The light receiving element 78 and the light emitting element 79a are connected to an external terminal device (not shown) through a connector pin 77a implanted in the substrate 77 so that an electric signal can be transmitted.

  The lens 74 is configured in substantially the same manner as the lens 10 in FIG. 1, and has an optical part 75 having a lens function and a diffraction function, an outer peripheral part 76 a located on the outer peripheral side of the optical part 75 and extending to the outermost outer periphery of the lens 74, And a mounting portion 76 that protrudes from the portion 76a in the horizontal direction in the drawing, and is fixed to the holding portion 71a that protrudes from the inner surface of the case 71 by the mounting portion 76, and has the same lens fixing structure as FIG. It is held and fixed by. That is, the adhesive surface 71b of the holding part 71a has a plated surface roughened by sandblasting, and a photo-curing adhesive is applied to the adhesive surface 71b, and the lens 74 is pressed against the holding part 71a while applying a load. Irradiation light is irradiated from the same light source device as in FIG. 1 to cure the adhesive. Further, as exaggeratedly shown in FIG. 7, for example, a four-step staircase diffraction grating 75 a is periodically and repeatedly formed on one surface of the optical unit 75.

  The received light b1 is converted into an electric signal by forming an image on the light receiving surface of the light receiving element 78 as first-order diffracted light (indicated by a broken line in the figure) by the diffraction grating 75a. Further, the transmission light b0 from the light emitting element unit 79 travels straight as 0th-order diffracted transmitted light (indicated by the solid line in the figure) through the diffraction grating 75a, enters the end face 73a of the optical fiber 73, and transmits to the outside through the optical fiber 73. Is done. For example, the wavelength of the reception light b1 is 1.49 μm, and the wavelength of the transmission light b0 is 1.31 μm. As described above, the received light b1 of the first-order diffracted light and the transmitted light b0 of the 0th-order diffracted transmitted light having different wavelengths are separated by the diffraction grating 75a.

  According to the bidirectional optical communication module 70 of FIG. 8, when the lens 74 is fixed to the adhesive surface 71 b of the holding portion 71 a in the case 71 by the attachment portion 76 with an adhesive by photocuring with irradiation light, the lens 74. Therefore, the lens 74 can be securely and securely adhered and fixed to the holding portion 71a of the case 71. In addition, since the adhesive surface 71b of the holding portion 71a is rougher than the plating surface, the adhesive is likely to spread on the adhesive surface 71b, and can be applied uniformly, while applying a load in the thickness direction of the adhesive layer. Since the film is irradiated with light and cured, the thickness of the adhesive layer can be made uniform.

  As described above, since the lens 74 can be stably and reliably bonded and fixed to the case 71 side in the optical communication module 70 of FIG. 8, the operation stability and certainty of the optical communication module 70 can be ensured.

  Next, the present invention will be described more specifically with reference to examples.

  <Example 1>

  In Example 1, the surface temperature when irradiated with irradiation light having a single wavelength of 365 nm is measured. Moreover, as Comparative Example 1, the surface temperature when ultraviolet rays (UV) were irradiated from a conventional UV light irradiation apparatus was measured.

  In Example 1, NAiS (Matsushita Electric Works) Aicure ANUJ5012, ANUJ61420C capable of irradiating light with a wavelength of 365 nm using an LED is used as the LED-UV light irradiation device, and a distance of 2.5 cm from the tip of the nozzle irradiated with light. The surface temperature was measured with a thermocouple at the position. In Comparative Example 1, NAiS (Matsushita Electric Works) Aicure SPOT TYPE ANUP5204 was used as the UV light irradiation device, and the surface temperature was measured in the same manner as in Example 1. The measurement results are shown in FIG.

  As can be seen from FIG. 9, in Comparative Example 1 in which ultraviolet rays were irradiated as in the prior art, the temperature rose considerably with the passage of irradiation time, and exceeded 130 degrees in a standard maximum irradiation time of 30 seconds, In Example 1 in which light having a wavelength of 365 nm was irradiated, the temperature did not exceed 60 degrees at an irradiation time of 30 seconds, and it was below the 70-degree line, where adverse effects such as deformation due to temperature rise were likely to occur even at an irradiation time of 60 seconds.

  <Example 2>

  As Example 2, the curing time of the adhesive when the irradiation light was irradiated under the same conditions as in Example 1 and with the output of the LED-UV light irradiation device set to 60 to 80% was examined. As a result, the adhesive was cured in 10 to 45 seconds. On the other hand, in Comparative Example 2, as a result of examining the curing time of the adhesive when irradiated with irradiation light under the same conditions as in Comparative Example 1 and with the output of the UV light irradiation apparatus set to 100%, 9 to 35 were obtained. Second. Comparing the results of Example 2 and Comparative Example 2, it can be seen that there is not much difference in the curing time of the adhesive. As the adhesive, a UV curable epoxy adhesive manufactured by Kyoritsu Chemical Co., Ltd. was used.

As described above, the best modes and examples for carrying out the present invention have been described. However, the present invention is not limited to these, and various modifications are possible within the scope of the technical idea of the present invention. is there. For example, in the present embodiment, the load jig 45 is made of a general glass material (BK7), but the present invention is not limited to this, and may be Pyrex (registered trademark) glass, blue plate glass, white plate glass, or the like. Moreover, as long as it is a light-transmitting material that transmits a wavelength in the range of 300 to 500 nm, a material other than a glass material may be used.

  Of course, the optical element to be fixed may be other than a lens, and may be a wave plate, a diffraction grating, a mirror, or the like.

  In addition, for example, an apparatus using an LED can be used as a light source apparatus that emits light having a single wavelength of 365 nm, but the present invention is not limited to this, and other single wavelengths in the range of 300 to 500 nm. May be a light source device that irradiates light, or a light source device that uses laser light from a laser diode or the like.

It is a principal part longitudinal cross-sectional view which shows the example of arrangement | positioning of the lens fixing structure and light source device for demonstrating the optical element fixing method by 1st Embodiment. It is a principal part longitudinal cross-sectional view which shows roughly the lens fixing structure and load jig | tool for demonstrating the optical element fixing method by 2nd Embodiment. It is a principal part longitudinal cross-sectional view which shows schematically the lens fixing structure and load jig | tool for demonstrating another optical element fixing method by 2nd Embodiment. It is a principal part longitudinal cross-sectional view which shows schematically the lens fixing structure and load jig | tool for demonstrating another optical element fixing method by 2nd Embodiment. It is a principal part longitudinal cross-sectional view which shows schematically the lens fixing structure and load jig | tool for demonstrating another optical element fixing method by 2nd Embodiment. It is a principal part longitudinal cross-sectional view which shows schematically the lens fixing structure for demonstrating the optical element fixing method by 3rd Embodiment, and the nozzle and positioning member of a load jig and a light source device. It is a graph of the light transmission characteristic which shows the relationship between the wavelength of three types of resin materials (PC, APL, PMMA) and light transmittance. Indicate It is the schematic diagram which looked at the inside of the optical communication module for bidirectional | two-way by 4th Embodiment from the side surface. It is a graph which shows the relationship between the light irradiation time in Example 1 and Comparative Example 1, and surface temperature.

Explanation of symbols

10 Lens (optical element)
11 Lens part (optical function part)
11a Convex part 12 Mounting part 13 Outer peripheral part 15 Mounting surface (adhesion fixing part)
20 Lens barrel (fixing member)
22 Holding surface (adhesive fixing part)
29 Adhesive layer (photo-curable adhesive)
30 light source device 32 light shielding member (light limiting unit)
40 Lens barrel (fixing member)
42 Holding surface (adhesive fixing part)
45 Load jig 46 Recess 46a Reflecting surface (light limiting part)
47 Reflecting surface (optical waveguide)
49 Adhesive layer (photo-curable adhesive)
50 lenses (optical elements)
51 Convex part (optical function part)
59 Adhesive layer (photo-curing adhesive)
61 Tip nozzle 62 Positioning member 70 Optical communication module 71 Case (fixing member)
71a Holding part (adhesive fixing part)
71b Adhesive surface 72 Holder 74 Lens (optical element)
75 Optical part 76 Mounting part a Irradiation light b Light irradiation direction

Claims (11)

An optical element fixing method in which an optical element is bonded and fixed to a fixing member with a photocurable adhesive,
When the photocurable adhesive is irradiated with light after applying the photocurable adhesive to at least one of the adhesive fixing portion of the optical element and the adhesive fixing portion of the fixing member, the photocurable adhesive is used. A light source device that does not generate light having a wavelength in a region not involved in the curing of the light source , a load is applied to the adhesive fixing portion through a load jig having a characteristic of transmitting light generated from the light source device, and the light irradiation is performed. An optical element fixing method, which is performed through the load jig .   The optical element fixing method according to claim 1, wherein the light source device generates light having a wavelength within a predetermined region involved in the curing of the photocurable adhesive. An optical element fixing method in which an optical element is bonded and fixed to a fixing member with a photocurable adhesive,
When the photocurable adhesive is irradiated with light after applying the photocurable adhesive to at least one of the adhesive fixing portion of the optical element and the adhesive fixing portion of the fixing member, the photocurable adhesive is used. Using a light source device that generates light of a specific wavelength within a predetermined region involved in curing, applying a load to the adhesive fixing portion through a load jig having a property of transmitting light generated from the light source device, An optical element fixing method , wherein light irradiation is performed through the load jig .   The optical element fixing method according to claim 1, wherein the light source device generates light having a specific wavelength within a wavelength range of 300 to 500 nm.   The optical element fixing method according to any one of claims 1 to 4, wherein a light restricting portion that restricts light is arranged so that light is not irradiated to a portion other than the adhesive fixing portion during the light irradiation. The optical element fixing method according to any one of claims 1 to 5, wherein the load jig has an optical waveguide portion that guides light to the adhesive fixing portion during the light irradiation. The optical element fixing method according to any one of claims 1 to 6 , wherein the light irradiation is performed after the light source device is positioned with respect to the fixing member and the optical element by a positioning member. The optical element fixing method according to any one of claims 1 to 7, wherein irradiation light from the light source device is incident from an upper surface of the load jig and a load is applied through the load jig . Optical element fixing method according to any one of claims 1 to 8 at least one surface of the adhesive fixing portions of the adhesive fixing portion and the fixing member is roughened by a surface roughness processing method of the optical element. An optical element fixing structure in which an optical element is bonded and fixed to an adhesive fixing portion of a fixing member at an adhesive fixing portion, and the optical element is fixed by the optical element fixing method according to any one of claims 1 to 9. A method of manufacturing an optical element fixing structure, wherein the optical element fixing structure is manufactured by fixing to a fixing member. The method of manufacturing an optical element fixing structure according to claim 10 , wherein the optical element fixing structure is a structure for performing the light irradiation through the optical element to the adhesive fixing portion.

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