Abstract:
This optical receptacle has the following: a concavity formed in a contact surface that contacts a substrate; a first optical surface, located at the bottom of said concavity, via which either light outputted from a photoelectric conversion element is inputted or light that is outputted from an end face of a light-transporting body and passes through the interior is outputted towards the photoelectric conversion element; a second optical surface via which either light that is inputted via the first optical surface and passes through the interior is outputted towards the end face of the light-transporting body or light outputted from the end face of the light-transporting body is inputted; a reflective surface, located in the path that light takes between the first optical surface and the second optical surface; and a connecting part that connects the interior of the concavity to the outside thereof.

Description:
TECHNICAL FIELD 
       [0001]    The present invention relates to an optical receptacle and an optical module including the optical receptacle. 
       BACKGROUND ART 
       [0002]    Conventionally, in optical communications using an optical transmission member such as an optical fiber and an optical waveguide, an optical module including a light emitting element such as a surface-emitting laser (for example, a vertical cavity surface emitting laser (VCSEL)) has been used. The optical module includes one or more photoelectric conversion elements (light emitting elements and light receiving elements), and a light coupling element for transmission or reception (hereinafter referred to also as “optical receptacle”) (see, for example, PTL 1). 
         [0003]      FIG. 1  illustrates a configuration of optical module  10  disclosed in PTL 1.  FIGS. 2A to 2D  illustrate a configuration of light coupling element  40  disclosed in PTL 1.  FIG. 2A  is a plan view of light coupling element  40 ,  FIG. 2B  is a bottom view of light coupling element  40 ,  FIG. 2C  is a front view of light coupling element  40 , and  FIG. 2D  is a right side view of light coupling element  40 . 
         [0004]    As illustrated in  FIG. 1 , optical module  10  disclosed in PTL 1 includes substrate  20 , photoelectric conversion element  30  disposed on substrate  20 , and light coupling element  40  disposed on substrate  20 . Substrate  20  includes substrate main body  21 , and first positioning protrusion  22  disposed on substrate main body  21 . As illustrated in  FIGS. 2A to 2D , light coupling element  40  includes recess  41  disposed on the surface facing substrate  20 , first lens surface  42  (incidence surface) on which light from photoelectric conversion element  30  is incident, total reflection surface  43  (reflection surface) configured to reflect light incident on first lens surface  42 , second lens surface  44  (emission surface) configured to emit light reflected by total reflection surface  43  toward an end surface of optical fiber  50 , second positioning protrusion  45  configured to set the position of optical fiber  50  with respect to light coupling element  40 , and second positioning recess  46  configured to set the position of photoelectric conversion element  30  with respect to light coupling element  40  at substrate  20 . 
         [0005]    As illustrated in  FIG. 1 , at the time of assembling optical module  10  disclosed in PTL 1, first, second positioning recess  46  of light coupling element  40  is fit to first positioning protrusion  22  of substrate  20  on which photoelectric conversion element  30  is disposed. Next, first positioning recess  52  of ferrule  51  supporting optical fiber  50  is fit to second positioning protrusion  45  of light coupling element  40 . In this manner, in optical module  10  disclosed in PTL 1, photoelectric conversion element  30  and optical fiber  50  are optically connected with each other. 
       CITATION LIST 
     Patent Literature 
       [0006]    PTL 1 
         [0007]    Japanese Patent Application Laid-Open No. 2009-163212 
       SUMMARY OF INVENTION 
     Technical Problem 
       [0008]    As a way of surely fixing light coupling element  40  disclosed in PTL 1 to substrate  20 , it is conceivable to use a thermosetting adhesive agent. For example, by applying and heat-curing an adhesive agent at the boundary between the side surface of optical module  10  and substrate  20 , light coupling element  40  is fixed to substrate  20 . 
         [0009]    When light coupling element  40  disclosed in PTL 1 is fixed using a thermosetting adhesive agent, however, a heat curing process (heating) is performed in the state where recess  41  of light coupling element  40  is closed by substrate  20  and the adhesive agent, and consequently the air in recess  41  may possibly be expanded and the position of light coupling element  40  may possibly be shifted. Light coupling element  40  fixed at an inadequate position in the above-mentioned manner cannot appropriately couple photoelectric conversion element  30  and an end surface of optical fiber  50 . 
         [0010]    In view of this, an object of the present invention is to provide an optical receptacle which does not easily cause positional displacement even when fixed to the substrate by use of an adhesive agent. In addition, another object of the present invention is to provide an optical module including the optical receptacle. 
       Solution to Problem 
       [0011]    An optical receptacle according to embodiments of the present invention is disposed between one or more photoelectric conversion elements disposed on a substrate and one or more optical transmission members, the optical receptacle being configured to optically couple the photoelectric conversion element and an end surface of the optical transmission member, and including: a recess formed on a contacting surface that makes contact with the substrate; one or more first optical surfaces disposed at an internal surface of the recess, the one or more first optical surfaces being configured to allow incidence of light emitted from the photoelectric conversion element, or emit, toward the photoelectric conversion element, light which is emitted from the end surface of the optical transmission member and advanced through an inside of the optical receptacle; one or more second optical surfaces configured to emit, toward the end surface of the optical transmission member, light which is incident on the first optical surface and advanced through the inside of the optical receptacle, or allow incidence of light emitted from the end surface of the optical transmission member; a reflection surface disposed on a light path of light between the first optical surface and the second optical surface, the reflection surface being configured to reflect, toward the second optical surface, light incident on the first optical surface, or reflect, toward the first optical surface, light incident on the second optical surface; and a communication part configured to communicate between an inside and an outside of the recess. 
         [0012]    An optical module according to embodiments of the present invention includes: a substrate; one or more photoelectric conversion elements disposed on the substrate; and the optical receptacle fixed to the substrate such that the first optical surface faces the photoelectric conversion element. The optical receptacle is fixed to a surface of the substrate with an adhesive agent applied at a boundary between a side surface adjacent to the contacting surface and the substrate. 
       Advantageous Effects of Invention 
       [0013]    According to the present invention, an optical receptacle which does not easily cause positional displacement even when fixed on a substrate with an adhesive agent can be provided. The optical receptacle according to the embodiments of the present invention can optically couple a photoelectric conversion element and an optical transmission member in an appropriate manner even when fixed on the substrate with an adhesive agent. 
     
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         [0014]      FIG. 1  illustrates a configuration of an optical module disclosed in PTL 1; 
           [0015]      FIGS. 2A to 2D  illustrate a configuration of a light coupling element disclosed in PTL 1; 
           [0016]      FIG. 3  illustrates a configuration of an optical module according to Embodiment 1; 
           [0017]      FIGS. 4A and 4B  are perspective views of an optical receptacle according to Embodiment 1; 
           [0018]      FIGS. 5A to 5D  illustrate a configuration of the optical receptacle according to Embodiment 1; 
           [0019]      FIG. 6  is a bottom view of an optical receptacle according to a modification of Embodiment 1; and 
           [0020]      FIGS. 7A to 7D  illustrate a configuration of an optical receptacle according to Embodiment 2. 
       
    
    
     DESCRIPTION OF EMBODIMENTS 
       [0021]    In the following, an optical receptacle and an optical module according to embodiments of the present invention will be described in detail with reference to the accompanying drawings. 
       Embodiment 1 
     (Configuration of Optical Module) 
       [0022]      FIG. 3  is a sectional view of optical module  100  according to Embodiment 1 of the present invention. In  FIG. 3 , the hatching of the cross section of optical receptacle  160  is omitted to illustrate light paths in optical receptacle  160 . 
         [0023]    As illustrated in  FIG. 3 , optical module  100  includes substrate  120 , one or more photoelectric conversion elements  140 , and optical receptacle  160 . When optical module  100  is used, optical transmission member  180  is connected to optical receptacle  160 . 
         [0024]    One or more photoelectric conversion elements  140  and optical receptacle  160  are disposed on substrate  120 . Substrate side protrusion  121  corresponding to positioning recess  166  of optical receptacle  160  described later is formed on substrate  120 . By fitting positioning recess  166  to substrate side protrusion  121 , it is possible to set the position of optical receptacle  160  at a predetermined position with respect to photoelectric conversion element  140  disposed on substrate  120 . The material of substrate  120  is not limited. Substrate  120  is, for example, a glass composite substrate, a glass epoxy substrate or the like. 
         [0025]    Photoelectric conversion element  140  is a light emitting element or a light receiving element, and is disposed on substrate  120 . In the present embodiment, a plurality of (twelve) photoelectric conversion elements  140  (light emitting elements and/or light receiving elements) are disposed on substrate  120 . In optical module  100  for transmission, light emitting element is used as photoelectric conversion element  140 . In optical module  100  for reception, a light receiving element is used as photoelectric conversion element  140 . The light emitting element is, for example, a vertical cavity surface emitting laser (VCSEL). The light receiving element is, for example, a photodetector. 
         [0026]    Optical receptacle  160  is disposed on substrate  120  in such a manner as to face photoelectric conversion element  140 . Disposed between photoelectric conversion element  140  and optical transmission member  180 , optical receptacle  160  optically couples photoelectric conversion element  140  and an end surface of optical transmission member  180 . In optical module  100  for transmission, optical receptacle  160  emits the light emitted from photoelectric conversion element  140  (light emitting element) toward an end surface of optical transmission member  180 . In optical module  100  for reception, optical receptacle  160  emits the light emitted from an end surface of optical transmission member  180  toward photoelectric conversion element  140  (light receiving element). It is to be noted that optical module  100  including both the light emitting element and the light receiving element as photoelectric conversion element  140  functions as an optical module for transmission and an optical module for reception. The configuration of optical receptacle  160  is described later in detail. 
         [0027]    The type of optical transmission member  180  is not limited. For example, optical transmission member  180  is an optical fiber, a light waveguide or the like. Optical transmission member  180  is connected with optical receptacle  160  through ferrule  181 . 
         [0028]    In ferrule  181 , ferrule side recess  182  corresponding to positioning protrusion  165  of optical receptacle  160  described later is formed. By fitting ferrule side recess  182  to positioning protrusion  165 , an end surface of optical transmission member  180  can be fixed at a predetermined position with respect to optical receptacle  160 . In the present embodiment, optical transmission member  180  is an optical fiber. In addition, the optical fiber may be of a single mode type, or a multiple mode type. 
       (Configuration of Optical Receptacle) 
       [0029]      FIGS. 4A to 5D  illustrate a configuration of optical receptacle  160  according to the embodiment.  FIG. 4A  is a perspective view of optical receptacle  160  according to the present embodiment as viewed from the upper side (top surface side), and  FIG. 4B  is a perspective view of optical receptacle  160  as viewed from the lower side (bottom surface side).  FIG. 5A  is a plan view of optical receptacle  160 ,  FIG. 5B  is a bottom view of optical receptacle  160 ,  FIG. 5C  is a front view of optical receptacle  160 , and  FIG. 5D  is a side view of optical receptacle  160 . 
         [0030]    As illustrated in  FIGS. 4A to 5D , optical receptacle  160  is a member having a substantially cuboid shape. Optical receptacle  160  includes housing part  161 , first optical surface  162 , third optical surface (reflection surface)  163 , second optical surface  164 , positioning protrusion  165 , positioning recess  166  and communication part  167 . Optical receptacle  160  is formed using a material which is transparent to light of wavelengths used in optical communications. Examples of the material of optical receptacle  160  include transparent resins such as polyetherimide (PEI) and cyclic olefin resin. In addition, optical receptacle  160  can be manufactured by injection molding, for example. 
         [0031]    Housing part  161  is a space (recess) for housing photoelectric conversion element  140 . Housing part  161  is disposed at a bottom surface that is contacting surface  168  configured to make contact with substrate  120 . The position of housing part  161  in contacting surface  168  is not limited. For example, housing part  161  may be disposed at a center portion of contacting surface  168 , or at a corner portion of contacting surface  168 . In the present embodiment, housing part  161  is disposed at a center portion of contacting surface  168 . In this case, contacting surface  168  is line-symmetric. The bottom surface of housing part  161  is parallel to the surface of substrate  120 . Here, the “center” means a case where the margins (contacting surface  168 ) are equal to each other in the front-rear direction and the horizontal direction of optical receptacle  160 . 
         [0032]    First optical surface  162  is an optical surface that allows the light emitted from photoelectric conversion element  140  (light emitting element) to enter optical receptacle  160 , or an optical surface that emits, toward photoelectric conversion element  140  (light receiving element), the light which is incident on second optical surface  164  and reflected by third optical surface  163 . First optical surface  162  is disposed on the bottom surface of housing part  161  (recess) such that first optical surface  162  can face photoelectric conversion element  140 . Two or more first optical surfaces  162  are disposed in one line in the long side direction on the bottom surface of housing part  161  in such a manner as to face photoelectric conversion element  140 . In the present embodiment, twelve first optical surfaces  162  are disposed in one line. The shape of first optical surface  162  is not limited. In the present embodiment, first optical surface  162  has a shape of a convex lens protruding toward photoelectric conversion element  140 . In addition, first optical surface  162  has a circular shape in plan view. Preferably, the central axis of first optical surface  162  is perpendicular to the light emitting surface or the light reception surface of photoelectric conversion element  140  (and the surface of substrate  120 ). In addition, preferably, the central axis of first optical surface  162  coincides with the light emitted from photoelectric conversion element  140  (light emitting element), or the optical axis of the light incident on photoelectric conversion element  140  (light receiving element). It is to be noted that the number of first optical surfaces  162  is not limited to two, and may be one. 
         [0033]    Third optical surface  163  is an optical surface (reflection surface) that reflects light incident on first optical surface  162  toward second optical surface  164 , or reflects light incident on second optical surface  164  toward first optical surface  162 . Third optical surface  163  is tilted such that the distance to optical transmission member  180  (front surface side) decreases from the bottom surface toward the top surface of optical receptacle  160 . The inclination angle of third optical surface  163  is not limited. In the present embodiment, the inclination angle of third optical surface  163  is 45 degrees to the optical axis of light incident on third optical surface  163 . The shape of third optical surface  163  is not limited. In the present embodiment, third optical surface  163  has a planar shape. Light incident on first optical surface  162  or second optical surface  164  is incident on third optical surface  163  at an incident angle greater than the critical angle. 
         [0034]    Second optical surface  164  is an optical surface that emits, toward an end surface of optical transmission member  180 , the light which is incident on first optical surface  162  and reflected by third optical surface  163 , or an optical surface that allows the light emitted from an end surface of optical transmission member  180  to enter optical receptacle  160 . Two or more second optical surfaces  164  are disposed in one line in the long side direction in such a manner as to face an end surface of optical transmission member  180  at the front surface of optical receptacle  160 . In the present embodiment, twelve second optical surfaces  164  are disposed in one line. The shape of second optical surface  164  is not limited. In the present embodiment, second optical surface  164  has a shape of a convex lens protruding toward an end surface of optical transmission member  180 . Preferably, the central axis of second optical surface  164  coincides with the central axis of an end surface of optical transmission member  180 . It is to be noted that the number of second optical surfaces  164  is not limited to two, and may be one. 
         [0035]    Positioning protrusion  165  fixes an end surface of optical transmission member  180  at a desired position with respect to second optical surface  164 . As described above, positioning protrusion  165  is fit to ferrule side recess  182  formed in ferrule  181  of optical transmission member  180 . The shape and the size of positioning protrusion  165  are not limited as long as the above-mentioned effect can be ensured. 
         [0036]    Positioning recess  166  fixes first optical surface  162  at a desired position with respect to photoelectric conversion element  140 . Substrate side protrusion  121  formed in substrate  120  is fit to positioning recess  166  as described above. The shape and the size of positioning recess  166  are not limited as long as the above-mentioned effect can be ensured. In the present embodiment, positioning recess  166  is a recess having a substantially columnar shape. 
         [0037]    Communication part  167  communicates between the inside and the outside of housing part  161 . The shape of communication part  167  is not limited as long as the above-described function can be ensured. Examples of the shape of communication part  167  include a communication groove and a communication hole which open at the internal surface of housing part  161  and exterior surface adjacent to contacting surface  168 . In the present embodiment, communication part  167  is a communication groove which is disposed at contacting surface  168  in such a manner as to open at the internal surface of housing part  161  and the exterior surface adjacent to contacting surface  168 . The position of communication groove in contacting surface  168  is not limited. In the present embodiment, the communication groove is disposed to connect a center portion of housing part  161  in the long side direction and a lowermost center portion in the long side direction of the back surface adjacent to contacting surface  168 . That is, the communication groove is disposed to linearly extend such that the central axis thereof passes through the center of housing part  161 . The cross-sectional shape of the communication groove is not limited. The communication groove may have a triangular shape or a rectangular shape in cross section. In the present embodiment, the communication groove has a rectangular shape in cross section. Also, the cross-sectional area of communication groove is not limited. Preferably, the cross-sectional area is set to a size such that the communication groove serves as a path of gas but not as a path of liquid. The width of the communication groove may be identical or different between housing part  161  side and the exterior surface side adjacent to contacting surface  168 . In the present embodiment, the width of the communication groove is constant. 
         [0038]    Next, the light path in optical module  100  according to the present embodiment is described. When optical receptacle  160  is used in optical module  100  for transmission, the light emitted from photoelectric conversion element  140  (light emitting element) enters optical receptacle  160  from first optical surface  162 . At this time, the light having entered optical receptacle  160  is converted into collimate light by first optical surface  162 , and is advanced toward third optical surface  163 . Next, the light having entered optical receptacle  160  is reflected by third optical surface  163 , and is emitted toward second optical surface  164 . The light reflected by third optical surface  163  and emitted out of optical receptacle  160  from second optical surface  164  reaches an end surface of optical transmission member  180  while converging. 
         [0039]    When optical receptacle  160  is used in optical module  100  for reception, the light emitted from an end surface of optical transmission member  180  enters optical receptacle  160  from second optical surface  164 . At this time, the light having entered optical receptacle  160  is converted into collimate light by third optical surface  163 , and is advanced toward third optical surface  163 . Next, the light having entered optical receptacle  160  is reflected by third optical surface  163 , and emitted toward first optical surface  162 . The light reflected by third optical surface  163  and emitted out of optical receptacle  160  from first optical surface  162  reaches photoelectric conversion element  140  (light receiving element) while converging. 
       (Assembling Method of Optical Module) 
       [0040]    An assembling method of optical module  100  according to the present embodiment is not limited. For example, optical module  100  can be assembled by fixing optical receptacle  160  by use of a thermosetting adhesive agent after fixing photoelectric conversion element  140  on substrate  120 . 
         [0041]    First, photoelectric conversion element  140  is fixed at a predetermined position of substrate  120 . To be more specific, photoelectric conversion elements  140  are disposed to face respective first optical surfaces  162  of optical receptacle  160 . Next, optical receptacle  160  is placed on substrate  120  on which photoelectric conversion element  140  is disposed. To be more specific, positioning recess  166  of optical receptacle  160  is fit to substrate side protrusion  121  of substrate  120 . In this manner, optical receptacle  160  can be disposed such that the central axis of photoelectric conversion element  140  and the central axis of first optical surface  162  coincide with each other. 
         [0042]    Next, an adhesive agent made of a thermosetting resin material is applied at a boundary portion between the surface of substrate  120  and the exterior surface (the front surface, the back surface, the right side surface and the left side surface) adjacent to contacting surface  168  (bottom surface) except for the portion where the communication groove opens. Thereafter, a heat curing process is performed at a predetermined temperature for a predetermined time. It is to be noted that, in the present embodiment, in the case where Ablestik BF-4 (Henkel Japan Corporation) is used as the heat curable adhesive agent, the temperature for the heat curing process is about 100 degrees, and the duration for the heat curing process is about 30 minutes. 
         [0043]    At this time, although the adhesive agent immediately after the application slightly intrudes between the surface of substrate  120  and contacting surface  168 , almost no adhesive agent enters housing part  161  from the opening of the communication groove. In addition, in the heat curing process, the air in housing part  161  is expanded and ejected to the outside via the communication groove, and therefore, no adhesive agent enters housing part  161  through the communication groove. It is to be noted that the amount of the adhesive agent existing between the surface of substrate  120  and the contacting surface is significantly small, and therefore the performance of optical module  100  is not influenced. 
         [0044]    Through the above-mentioned processes, optical module  100  according to the present embodiment is assembled. 
       (Effect) 
       [0045]    Optical receptacle  160  according to the present embodiment includes communication part  167  that is formed on contacting surface (bottom surface)  168  that makes contact with the surface of substrate  120 , and is configured to communicate between the inside and the outside of housing part  161 . With this configuration, in the heat curing process, the air in housing part  161  is ejected to the outside through communication part  167 . In addition, since optical receptacle  160  is not partially separated from substrate  120 , positional displacement of the optical receptacle  160  does not occur unlike the conventional techniques. Thus, since installation accuracy of optical receptacle  160  with respect to substrate  120  is high in optical module  100  according to the present embodiment, photoelectric conversion element  140  and optical transmission member  180  can be optically coupled to each other in an appropriate manner. 
         [0046]    As described above, the shape of communication part  167  is not limited.  FIG. 6  is a bottom view of optical receptacle  160  according to a modification of Embodiment 1. As illustrated in  FIG. 6 , the communication groove may be formed such that the width thereof is small on housing part  161  side and is increased toward the exterior surface adjacent to contacting surface  168 . In this case, the opening of the communication groove is not closed with the adhesive agent. In addition, even when the adhesive agent reaches the opening edge of the communication groove, the optical characteristics are not influenced by the adhesive agent having reached first optical surface  162  since the distance to first optical surface  162  is long. 
       Embodiment 2 
     (Configuration of Optical Module) 
       [0047]    An optical module according to Embodiment 2 is different from optical module  100  according to Embodiment 1 only in configuration of optical receptacle  260 . Therefore, the configurations identical to those of optical module  100  according to Embodiment 1 are denoted with the same reference numerals, and the description thereof will be omitted. 
         [0048]      FIGS. 7A to 7D  illustrate a configuration of optical receptacle  260  according to Embodiment 2.  FIG. 7A  is a plan view of optical receptacle  260 ,  FIG. 7B  is a bottom view of optical receptacle  260 ,  FIG. 7C  is a front view of optical receptacle  260 , and  FIG. 7D  is a side view of optical receptacle  260 . 
         [0049]    The optical module according to Embodiment 2 includes substrate  120 , photoelectric conversion element  140  and optical receptacle  260 . 
       (Configuration of Optical Receptacle) 
       [0050]    Optical receptacle  260  includes housing part  161 , first optical surface  162 , third optical surface  163  (reflection surface), second optical surface  164 , positioning protrusion  165 , positioning recess  266  and communication part  267 . 
         [0051]    Positioning recess  266  is a through hole that opens at the top surface and contacting surface  168  (bottom surface) of optical receptacle  260 . 
         [0052]    Communication part  267  is a communication groove that communicates between the inside and the outside of housing part  161 . In the present embodiment, the communication groove is disposed to connect a center portion of housing part  161  in the short side direction and the internal surface of positioning recess  266  (the exterior surface adjacent to contacting surface  168 ). In this case, one communication groove may be disposed at one end portion of housing part  161  in the long side direction, or two communication grooves may be disposed at both ends of housing part  161  in the long side direction. In the present embodiment, one communication groove is disposed at one end portion of housing part  161  in the long side direction. 
         [0053]    In an assembling method of the optical module according to Embodiment 2, after photoelectric conversion element  140  is disposed to substrate  120 , positioning recess  266  of optical receptacle  260  is fit to substrate side protrusion  121  of substrate  120 . Next, an adhesive agent made of a thermosetting resin material is applied to the boundary between the surface of substrate  120  and the exterior surface adjacent to contacting surface  168  (the front surface, the back surface, the right side surface and the left side surface), and thereafter a heat curing process is performed at a predetermined temperature for a predetermined time. At this time, no adhesive agent immediately after the application enters housing part  161 . In addition, the air expanded in housing part  161  is ejected to the outside from the through hole via the communication groove. 
       (Effect) 
       [0054]    The optical module according to Embodiment 2 has an effect similar to that of optical module  100  according to Embodiment 1. 
         [0055]    While first optical surface  162  and second optical surface  164  are convex lenses in optical receptacles  160  and  260  according to the embodiments, first optical surface  162  and second optical surface  164  may be planar surfaces. To be more specific, only first optical surface  162  may be a planar surface, or only second optical surface  164  may be a planar surface. When first optical surface  162  is formed as a planar surface, third optical surface  163  is formed such that third optical surface  163  can function as a recessed surface mirror for example. In addition, when the light immediately before reaching second optical surface  164  effectively converges with first optical surface  162 , third optical surface  163  and the like, second optical surface  164  may be formed as a plane. It is to be noted that, in this case, the reference position of first optical surface  162  is not limited. 
         [0056]    While optical receptacles  160  and  260  are used in optical module  100  for transmission or for reception in the above-mentioned embodiments, optical module  100  according to the embodiments of the present invention may be used in an optical module for transmission and reception. In this case, the optical module includes a light emitting element and a light receiving element as a plurality of photoelectric conversion elements. 
         [0057]    This application is entitled to and claims the benefit of Japanese Patent Application No. 2014-156491 filed on Jul. 31, 2014, the disclosure each of which including the specification, drawings and abstract is incorporated herein by reference in its entirety. 
       INDUSTRIAL APPLICABILITY 
       [0058]    The optical receptacle and the optical module according to the embodiments of the present invention are suitable for optical communications using an optical transmission member. 
       REFERENCE SIGNS LIST 
       [0000]    
       
           10  Optical module 
           20  Substrate 
           21  Substrate main body 
           22  First positioning protrusion 
           30  Photoelectric conversion element 
           40  Light coupling element 
           41  Recess 
           42  First lens surface 
           43  Reflection surface 
           44  Second lens surface 
           45  Second positioning protrusion 
           46  Second positioning recess 
           50  Optical fiber 
           51  Ferrule 
           52  First positioning recess 
           100  Optical module 
           120  Substrate 
           121  Substrate side protrusion 
           140  Photoelectric conversion element 
           160 ,  260  Optical receptacle 
           161  Housing part (recess) 
           162  First optical surface 
           163  Third optical surface 
           164  Second optical surface 
           165  Positioning protrusion 
           166 ,  266  Positioning recess 
           167 ,  267  Communication part 
           168  Contacting surface 
           180  Optical transmission member 
           181  Ferrule 
           182  Ferrule side recess