JP2007094193A - Optical communication module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical communication module provided with a connection optical system having low height from a substrate by flattening optical intensity distribution of propagating light. <P>SOLUTION: The optical communication module comprises a pipe type optical system for making optical intensity of light uniform by converting a direction of light from a light emitting element into a direction parallel to a substrate face as the connection optical system, or converting light of the direction parallel to the substrate face into a light receiving direction of a light receiving element. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an optical communication module that performs optical data transmission by connecting to an optical fiber.

  In recent years, as mobile phones that have become widespread, folding type, slide type, and rotary type mobile phones have come to be frequently used for convenience and other reasons during use and carrying. In the case of a foldable, slide-type, or rotary-type mobile phone, modules such as a communication function unit, an amplifier circuit unit, and a display circuit unit are distributed and arranged in a plurality of cases. Wiring connecting the arranged modules is required to be flexible and strong enough to withstand driving.

  In addition, wiring between each module requires high-speed data transmission due to the multi-functionality of mobile phones such as music playback function, video playback function, and photography function, countermeasures against electromagnetic interference with external devices, and demands for long-term use. Therefore, low power consumption is required.

An attempt has been made to use an optical fiber as a wiring that satisfies these requirements (for example, see Patent Document 1). In the following description, a module that performs optical data transmission by connecting each module with an optical fiber is referred to as an optical communication module.
JP2003-244295A.

  When the optical path length of the optical fiber is long, the light incident on the incident end of the optical fiber is disturbed while propagating through the core of the optical fiber, so the light on the exit end face of the light emitted from the core at the other end of the optical fiber. The intensity distribution (hereinafter, “the light intensity distribution at the emission end face of the light emitted from the core” is abbreviated as “the emission end light intensity distribution”) is uniform. However, in an optical fiber that is as short as several centimeters and is steeply bent, such as between mobile phone modules, the light that is being propagated is not sufficiently disturbed, so that the light intensity distribution at the emission end tends to be non-uniform. Even when light of uniform light intensity is incident on the optical fiber, the bending state of the optical fiber changes due to folding, rotation, etc. of the mobile phone, and the light intensity distribution at the emission end varies depending on the bending state. To do. In the case of a light receiving element having a light receiving area smaller than the area of the cross section of the core, it may not be possible to receive light sufficient for optical data transmission.

  In addition, a light emitting diode that emits light from the upper surface of a semiconductor in which light emitting elements are stacked (hereinafter, “light emitting diode” is abbreviated as “LED”) or a surface emitting laser diode (hereinafter, “surface emitting laser diode”). "Is abbreviated as" surface emitting LD ".) Is mounted so as to emit light in a direction perpendicular to the substrate of the optical communication module, or a photo having a light receiving portion on the upper surface of a semiconductor in which light receiving elements are stacked. When a diode (hereinafter, “photodiode” is abbreviated as “PD”) is mounted so as to receive light from a direction perpendicular to the substrate, the optical fiber is in the normal direction of the substrate surface. Are connected on the substrate. Accordingly, when the substrate of the optical communication module is mounted so as to be parallel to the base of the mobile phone, a height for avoiding steep bending of the optical fiber is required above the substrate surface. Therefore, it becomes difficult to make the cellular phone thin.

  On the other hand, since the peripheral circuit for driving the light emitting element and the light receiving element is arranged on the substrate, the substrate cannot be made small. Therefore, even when the substrate of the optical communication module is mounted so as to be perpendicular to the base of the mobile phone in order to avoid steep bending of the optical fiber, the size of the substrate becomes an obstacle and the mobile phone is It becomes difficult to make it thin.

  Therefore, the mobile phone in which the modules are connected by an optical fiber has a problem that it is difficult for the light receiving element to receive light stably and to reduce the thickness of the mobile phone.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an optical communication module including a connection optical system that can make the light intensity distribution of propagating light uniform and has a low height from the substrate. To do.

  In order to achieve the above object, the optical communication module according to the first invention of the present application can convert the direction of light from the light emitting element into a direction parallel to the substrate surface as the connection optical system, and can transmit light from the light emitting element. A tube-type optical system capable of making the light intensity distribution uniform and coupling to the optical fiber is inserted between the optical fiber and the light emitting element.

  Specifically, the first invention of the present application is a light emitting element that is disposed on a substrate and whose light emission direction is a normal direction of the substrate surface, and a reflection that is disposed on the substrate and is in the light emission direction of the light emitting element. A light direction conversion unit that changes the light propagation direction by specular reflection or total reflection of light from the light emitting element on the surface, and a direction parallel to the substrate surface by specular reflection or total reflection of light from the light direction conversion unit And a tube-type optical system having a light guide portion that propagates to the output end and leads to the output end.

  The light guide section disturbs the light from the end opposite to the emission end by specular reflection or total reflection inside, and is perpendicular to the light propagation direction (hereinafter referred to as “cross section perpendicular to the light propagation direction”). Is abbreviated as “vertical cross section”), and is coupled to an optical fiber connected to the output end of the light guide. The tubular optical system is mounted on the substrate so that the longitudinal direction of the light guide portion and the substrate surface are parallel to suppress the height from the substrate.

  On the other hand, the light direction conversion unit connected to the end of the light guide unit opposite to the emission end converts light from a direction perpendicular to the substrate from the longitudinal direction of the light guide unit to the light guide unit. Join.

  Therefore, by mounting the tube-type optical system in the optical communication module so that the light direction changing unit is in the light emission direction of the light-emitting element, the tube-type optical system changes the direction of light from the light-emitting element. The light can be converted into the longitudinal direction of the light guide, and the light intensity distribution of the light from the light emitting element can be made uniform and coupled to the optical fiber.

  Therefore, the first invention of the present application can provide an optical communication module including a connection optical system that can make the light intensity distribution of propagating light uniform and has a low height from the substrate.

  In order to achieve the above object, an optical communication module according to the second invention of the present application can convert light in a direction parallel to the substrate surface into a light receiving direction of a light receiving element as the connection optical system, and can transmit light from an optical fiber. A tube-type optical system capable of making the light intensity distribution uniform and coupling to the light receiving element is inserted between the optical fiber and the light receiving element.

  Specifically, in the second invention of the present application, the light receiving element is disposed on the substrate and the light receiving direction is a normal direction of the substrate surface, and the light receiving element is disposed on the substrate surface, and the light from the incident end is specularly reflected or totally reflected. The light guide unit propagates in a direction parallel to the substrate surface by reflection, and the light from the light guide unit is specularly reflected or totally reflected by the reflection surface in the light propagation direction of the light guide unit to change the light propagation direction. And a tube-type optical system having a light direction conversion unit that converts the light receiving direction of the light receiving element.

  The light guide unit internally disturbs the light from the optical fiber connected to the incident end by specular reflection or total reflection to make the light intensity distribution in the vertical section uniform and propagate it to the end opposite to the incident end of the light guide unit. To do. The tubular optical system is mounted on the substrate so that the longitudinal direction of the light guide portion and the substrate surface are parallel to suppress the height from the substrate.

  On the other hand, the light direction conversion unit connected to the end opposite to the incident end of the light guide unit converts the direction of the light combined from the light guide unit into the light reception direction of the light receiving element, to the light receiving element. Irradiate.

  Therefore, by mounting the tube-type optical system so that the light direction conversion unit is located in the light receiving direction of the light receiving element, the light receiving element receives light from an optical fiber having a uniform light intensity distribution. can do.

  Therefore, the second invention of the present application can provide an optical communication module including a connection optical system that can make the light intensity distribution of propagating light uniform and has a low height from the substrate.

  In the optical communication module according to the first invention of the present application or the second invention of the present application, there are many cross-sectional shapes perpendicular to the light propagation direction in the light propagation region in a part or all of the light guide section of the tubular optical system. A rectangular shape is preferred.

  When the shape of the vertical cross section in the light propagation region of the tube type optical system is circular, the incident light is likely to generate a standing wave (mode) passing through the center of the circle by specular reflection or total reflection, and near the center in the vertical cross section The light intensity is likely to become a strong light intensity distribution. Further, the standing wave is not easily disturbed, and a certain optical path length is required to make the light intensity distribution in the vertical section uniform.

  However, the vertical cross-sectional shape of the light guide unit according to the first invention of the present application or the second invention of the present application is a polygon, and the light path is complicated, so that the propagation light is disturbed for each reflection, and the light path length is short. Even in this case, the light intensity distribution in the vertical section is uniform.

  Therefore, the first invention of the present application or the second invention of the present application can provide an optical communication module including a connection optical system that can make the light intensity distribution of propagating light uniform with a short optical path length and has a low height from the substrate. it can.

The vertical cross-sectional size of the light propagation region of the light guide is designed to ensure an alignment error between the tubular optical system and the optical fiber. Specifically, the vertical cross section of the light propagation region of the light guide unit is designed to have a size inscribed in a circle with a certain length radius centered on the central axis of the optical fiber as a region for ensuring the alignment error. The Since the shape of the vertical cross section of the light propagation region of the light guide portion is closer to a circle as the N is larger, it is possible to reduce the surplus region outside the region that ensures the alignment error. Therefore, the larger N is, the more light that leaks from the surplus area to the outside can be reduced.
Therefore, the larger N is, the smaller the vertical cross-sectional area of the light propagation region of the light guide unit is while ensuring the alignment error, and the smaller the loss of light transmission between the optical fiber and the tube-type optical system. can do. On the other hand, the smaller the N is, the greater the effect of disturbance of the propagation light.

  In the optical communication module according to the first invention of the present application and the second invention of the present application, the shape of the cross section perpendicular to the light propagation direction of the light propagation region in a part or all of the section of the light guide section of the tubular optical system is angular. It is preferably a round M square (M is an integer of 3 or more).

  The rounded M square is a shape obtained by rounding at least one of the vertices of the M square. The light guide unit according to the first invention of the present application or the second invention of the present application has a rounded M-square shape, and the light path is complicated. Therefore, the propagation light is disturbed at each reflection, and the optical path length is short. Even in this case, the light intensity distribution in the vertical section is uniform.

  In addition, since the vertical cross-sectional shape of the core of the optical fiber is circular and the far field pattern (FFP) of the light emitted from the optical fiber is circular, the light guide unit whose vertical cross-sectional shape is rounded M-square is vertical. The alignment accuracy required between the optical fiber and the light guide can be relaxed as compared to the light guide having an M-shaped cross section.

  Therefore, the first invention of the present application or the second invention of the present application can provide an optical communication module including a connection optical system that can make the light intensity distribution of propagating light uniform with a short optical path length and has a low height from the substrate. it can.

  In the optical communication module according to the first invention of the present application and the second invention of the present application, a cross section perpendicular to the light propagation direction of the light propagation region in a part or all of the light guide section of the tubular optical system has a plurality of curvatures. Preferably, the shape is surrounded by a single closed curve having

  The shape of the vertical section of the light guide unit according to the first invention of the present application or the second invention of the present application is a shape surrounded by a single closed curve having a plurality of curvatures (hereinafter referred to as “one single having a plurality of curvatures”). "Shape surrounded by a closed curve" is abbreviated as "single closed curve shape.") Since the light path is complicated, the propagation light is disturbed at each reflection, and even if the optical path length is short, The light intensity distribution becomes uniform.

  Therefore, the first invention of the present application or the second invention of the present application can provide an optical communication module including a connection optical system that can make the light intensity distribution of propagating light uniform with a short optical path length and has a low height from the substrate. it can.

  In the optical communication module according to the first invention of the present application and the second invention of the present application, a cross section perpendicular to the light propagation direction of the light propagation region in a part or all of the light guide portion of the tubular optical system has a plurality of curves. It is preferable that the ends are connected and surrounded by each other, and the connection points of the plurality of curves are singular points.

  The shape of the vertical section of the light guide unit according to the first invention of the present application or the second invention of the present application is a shape surrounded by connecting ends of a plurality of curves, and a shape having a connection point of the plurality of curves as a singular point. (Hereinafter, “a shape surrounded by connecting ends of a plurality of curves and having a singular point at a connection point of the plurality of curves” is abbreviated as “a plurality of curve shapes”). Therefore, the propagation light is disturbed for each reflection, and the light intensity distribution in the vertical section becomes uniform even with a short optical path length.

  Therefore, the first invention of the present application or the second invention of the present application can provide an optical communication module including a connection optical system that can make the light intensity distribution of propagating light uniform with a short optical path length and has a low height from the substrate. it can.

  In the optical communication module according to the first invention of the present application and the second invention of the present application, at least one section perpendicular to the light propagation direction of the light propagation region in a part or all of the light guide section of the tubular optical system is at least one. It is preferable that the end of the line segment is connected to the end of at least one curve.

  The shape of the light guide section according to the first invention of the present application or the second invention of the present application is a shape surrounded by connecting at least one line segment end and at least one curve end (hereinafter, “at least "The shape surrounded by connecting the end of one line segment and the end of at least one curve" is abbreviated as "line segment curve shape"). The propagating light is disturbed, and the light intensity distribution in the vertical section becomes uniform even with a short optical path length.

  Therefore, the first invention of the present application or the second invention of the present application can provide an optical communication module including a connection optical system that can make the light intensity distribution of propagating light uniform with a short optical path length and has a low height from the substrate. it can.

  In the optical communication module according to the first invention of the present application and the second invention of the present application, a cross section perpendicular to the light propagation direction of the light propagation region in one section of the light guide section of the tubular optical system and the light propagation in the other section The cross section perpendicular to the light propagation direction in the region may have a different shape.

  In the light guide section, the standing wave is converted by the propagation of light from one section to another section, so that the propagation mode is disturbed and the light intensity distribution in the vertical section in the other section becomes uniform.

  Therefore, the first invention of the present application or the second invention of the present application can provide an optical communication module including a connection optical system that can make the light intensity distribution of propagating light uniform with a short optical path length and has a low height from the substrate. it can.

  In the optical communication module according to the first invention of the present application and the second invention of the present application, the area of the cross section perpendicular to the light propagation direction in the light transmission region of the light guide section of the tube optical system is the guide of the tube optical system. It may decrease monotonously from one end of the light section to the other end.

  In the light guide portion, the area of the vertical cross section of the light guide portion decreases from the one end to the other end, so that if light propagates from the one end to the other end, the light guide portion The incident angle of light on the reflection surface of the light portion decreases from the one end toward the other end. Therefore, the light guide unit widens the far field pattern of light from the other side, and makes the light intensity distribution uniform. Further, since the incident angle of the light is reduced, the number of reflections on the reflecting surface is increased, so that the light intensity distribution in the vertical section becomes uniform.

  Therefore, the first invention of the present application can provide an optical communication module including a connection optical system that can make light having a uniform light intensity distribution incident on an optical fiber and has a low height from the substrate.

  Further, by obtaining a vertical cross-sectional size of the light transmission region at the other end of the light guide portion smaller than the size of the core of the optical fiber, a margin for alignment with the light emitting element and the optical fiber is obtained. Can do.

  In addition, the second invention of the present application can provide an optical communication module including a connection optical system that can make the light intensity distribution of the light from the optical fiber uniform and be coupled to the light receiving element, and has a low height from the substrate.

  Further, by obtaining a vertical cross-sectional size of the light transmission region at the other end of the light guide unit larger than the size of the core of the optical fiber, a margin for alignment between the light receiving element and the optical fiber is obtained. Can do.

  The present invention can provide an optical communication module including a connection optical system that can make the light intensity distribution of propagating light uniform and has a low height from the substrate. Furthermore, it is possible to provide an optical system optical communication module including a connection optical system that can make the light intensity distribution of propagating light uniform with a short optical path length.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited to embodiment shown below.

(Embodiment 1)
One embodiment according to the first invention of the present application is disposed on a substrate, the light emitting direction is a normal direction of the substrate surface, and the light emitting element is disposed on the substrate and is in the light emitting direction of the light emitting element. The light from the light emitting element is specularly reflected or totally reflected on the reflecting surface to change the propagation direction of the light, and the light from the light direction changing unit is parallel to the substrate surface by specular reflection or total reflection. And a tube-type optical system having a light guide unit that propagates in the direction and guides the light to the exit end.

  The conceptual diagram of the optical communication module 901 which is one embodiment which concerns on this invention 1 invention is shown in FIG. The optical communication module 901 includes a substrate 10, a light emitting element 4, a tubular optical system 1, a peripheral circuit 6, and a connector 7.

  The substrate 10 physically supports the optical communication module 901 and has electrical wiring (not shown) that electrically connects electronic components to be mounted. As the material of the substrate 10, a material with improved insulation, for example, a dielectric material such as glass epoxy resin, fluororesin, or ceramic can be used.

  The light emitting element 4 converts the electric signal into the signal light A and radiates the signal light A from the surface to the outside. An LED or a surface emitting LD can be used as the light emitting element 4. A VCSEL can be exemplified as the surface emitting LD.

The tubular optical system 1 includes a light direction conversion unit 2 and a light guide unit 3.
The light guide section 3 is a tube whose one end is an emission end 19 that emits light, or a tube filled with a resin having a high transmittance with respect to the wavelength used, and a reflection surface 18 that reflects light is reflected on the inner wall of the tube. Has been placed. The reflecting surface 18 can be a reflecting mirror that specularly reflects light. The light propagating through the light guide 3 is repeatedly reflected by the reflecting surface 18 and guided to the emission end 19. The light is disturbed by being repeatedly reflected by the reflecting surface 18, and the near-field pattern at the exit end 19 becomes uniform.

  The light guide unit 3 may have a structure in which a medium N having a high refractive index is covered with a medium M having a low refractive index. The light is totally reflected at the interface between the medium N and the medium M. Therefore, the interface can be the reflecting surface 18. Since the light in the medium N is repeatedly totally reflected at the interface and guided to the output end 19, the near-field pattern at the output end 19 is uniform as in the case where a reflecting mirror is used for the reflecting surface 18.

  The light direction conversion part 2 has an opening partly. Furthermore, the light direction conversion part 2 has the reflective surface 13 in the position which the light which injected from the said opening part irradiates. Since the reflecting surface 13 is disposed at a constant angle with respect to the propagation direction of the light from the opening, the propagation direction of the light is converted by the reflecting surface 13. The reflecting surface 13 can be a reflecting mirror that specularly reflects light. For example, when the inclination of the reflecting surface 13 is expressed by an angle α between the reflecting surface 13 and the surface of the substrate 10, it can be exemplified that the range is 0 ° <α <90 °. The same applies to the inclination of the reflecting surface of the light direction changing unit in the following embodiments.

  In addition, the light direction conversion part 2 is good also considering the opening part side as the medium N, and the opposite side to an opening part as the medium M. Since the light is totally reflected at the interface between the medium N and the medium M, the interface can be used as the reflecting surface 13.

  The tube-type optical system 1 includes the light direction conversion unit 2 and the light direction conversion unit 2 so that the light whose propagation direction is converted by the reflection surface 13 of the light direction conversion unit 2 is coupled to the end of the light guide unit 3 opposite to the emission end 19. The light guide 3 is connected.

  The peripheral circuit 6 is provided with electronic components that perform calculations for data transmission. For example, a memory for storing data and an IC for performing signal conversion for data transmission can be exemplified.

  One end of the optical fiber 300 is inserted into the connector 7, and the optical communication module 901 and the optical fiber 300 are fixed.

  The optical communication module 901 mounts the peripheral circuit 6, the light emitting element 4, the tubular optical system 1 and the connector 7 on the surface of the substrate 10 as described below. In the following description, “the side on which the tube optical system of the substrate is mounted” is “the surface of the substrate”, and “the side opposite to the side on which the tube optical system of the substrate is mounted” is “the back surface of the substrate” Abbreviated.

  Electric wiring such as power lines and signal lines (not shown) is arranged on the substrate 10, and the peripheral circuit 6 and the light emitting element 4 are electrically connected.

  The light emitting element 4 is fixed to the substrate 10 on the side opposite to the upper surface that emits light. Therefore, the light emitting element 4 emits light in the normal direction of the surface of the substrate 10. When the light emitting element 4 is a surface emitting LD, the electrode is also on the upper surface, and thus the electrode and the electric wiring are connected by the wiring 9.

  The tubular optical system 1 is arranged so that the light propagation direction of the light of the light guide 3 is parallel to the surface of the substrate 10 and the light emitting element 4 is located in the opening of the light direction changer 2.

  The connector 7 has one end of the inserted optical fiber 300 (hereinafter, “one end of the optical fiber 300 inserted into the connector 7” is abbreviated as “one end of the optical fiber 300”), and the output end 19 of the light guide unit 3. Is arranged at a position to connect. Accordingly, the outgoing light B emitted from the outgoing end 19 propagates to one end of the optical fiber 300.

  The optical communication module 901 may be fixed by covering the substrate 10 with the resin 15 in order to prevent the tube-type optical system 1 and the connector 7 from vibrating or being displaced due to disturbance. For example, the refractive index of the resin 15 can be made lower than that of the medium in the light propagation region. By directly covering the medium in the light propagation region with the resin 15 having a low refractive index, the optical communication module 901 can propagate light with total reflection at the interface between the two. Further, the optical communication module 901 may be formed in a package shape in which the inside of the light guide unit 3 is filled with a resin having a high transmittance with respect to the used wavelength, and the entire substrate 10 is covered with the resin 15.

  The optical communication module 901 operates as described below. Transmission data stored in the peripheral circuit 6 is converted into an electric signal in a transmittable format and transmitted to the light emitting element 4 through the electric wiring (not shown) of the substrate 10. The light emitting element 4 converts the electric signal and emits signal light A. The signal light A radiated from the light emitting element 4 irradiates the reflecting surface 13, changes the propagation direction, and enters the light guide 3. The signal light A is repeatedly reflected by the reflection surface 18 inside the light guide 3 and is disturbed to reach the emission end 19. The outgoing light B is a signal light A disturbed, and the near-field pattern of the outgoing end 19 is uniform. Since the exit end 19 and one end of the optical fiber 300 are in close contact with each other, the exit light B enters one end of the optical fiber 300. Accordingly, since the optical communication module 901 can enter light having a large area and uniform light intensity at one end of the optical fiber 300, even if the bending state of the optical fiber 300 fluctuates, the optical communication module 901 stably transmits optical data to other modules. be able to.

  In addition, since the tubular optical system 1 converts the light propagation direction into a direction parallel to the surface of the substrate 10, even if the light emitting element 4 that emits light in the normal direction of the surface of the substrate 10 is used, The height H of the communication module 901 can be reduced.

  Therefore, the optical communication module 901 can make the light having a uniform light intensity distribution incident on one end of the optical fiber 300 and reduce the height from the substrate 10.

  Since the optical communication module 901 can be mounted on the surface of the cellular phone base 400 as shown in FIG. 1, it is possible to achieve both stable optical data transmission and thinning of the cellular phone. The optical communication module 901 and the cellular phone base 400 can be electrically connected by via-hole electrodes or through-hole electrodes.

  The shape of the cross section perpendicular to the light propagation direction of the light propagation region surrounded by the reflection surface 18 of the light guide 3 is non-circular, for example, a polygon, a rounded M-square, a single closed curve, a multiple curve, or A line segment curve shape is preferred.

  As a result of the simulation of the distance dependency of the light intensity distribution in the vertical cross section of the light guide unit 3, when the shape of the vertical cross section of the light propagation region is circular, the light transmission part 3 is centered even at a position of 3.0 mm from the incident end where light is incident. The light intensity in the vicinity is strong. On the other hand, when the shape of the vertical cross section of the light propagation region is non-circular, the light intensity of the vertical cross section is uniform at a position 1.1 mm from the incident end. Therefore, the non-circular shape of the vertical cross-section of the light propagation region of the light guide 3 is more likely to disturb light, and the light intensity uniformity of the vertical cross-section can be improved with a short optical path length.

  Therefore, since the length of the light guide 3 in the longitudinal direction can be shortened, the size of the optical communication module 901 can be reduced, and the mobile phone can be downsized.

  Furthermore, it is preferable that the cross section perpendicular to the light propagation direction of the light propagation region in one section of the light guide 3 is different from the cross section perpendicular to the light propagation direction of the light propagation region in the other section.

  For example, the shape of the vertical cross section of the light transmission region in the section on the light direction conversion unit 2 side of the light guide unit 3 is a square, and the shape of the vertical cross section of the light transmission region in the section on the output end 19 side of the light guide unit 3 is circular. It can be. The light propagates from the section on the light direction changer 2 side to the section on the exit end 19 side, so that the propagation mode is disturbed and the near field pattern on the exit end 19 becomes uniform. Further, the near-field pattern of the emission end 19 is circular, facilitating alignment with the optical fiber 300 having a circular vertical cross section, and the output light B can be efficiently coupled from the light guide 3 to the optical fiber 300.

  Therefore, the luminance of the light emitting element 4 can be lowered, and power saving of the mobile phone can be achieved.

(Embodiment 2)
The conceptual diagram of the optical communication module 902 which is other embodiment which concerns on this invention 1st invention is shown in FIG. In the optical communication module 902, the same reference numerals as those used in FIG. 1 have the same functions and the same arrangement. The difference between the optical communication module 902 and the optical communication module 901 of FIG. 1 is that the light direction changing unit 2 has the reflective surface 23 instead of the reflective surface 13.

  The function and arrangement of the reflecting surface 23 and the reflecting surface 13 in FIG. 1 are the same, but the reflecting surface 23 is a convex reflecting surface in which the vicinity of the center of the reflecting surface 23 projects to the light emitting element 4 side.

  The signal light A radiated from the light emitting element 4 irradiates the reflecting surface 23, changes the propagation direction, and enters the light guide 3. The signal light A reaches the output end 19 as the output light B as described in the optical communication module of FIG.

  Therefore, the optical communication module 902 can obtain the same effect as the optical communication module 901.

  Further, since the reflecting surface 23 is a convex reflecting surface, the signal light A is reflected so as to widen the far field pattern of the light emitting element 4. After reflection, the incident angle of the signal light A incident on the inside of the light guide unit 3 increases on the reflection surface 18, and the number of reflections on the reflection surface 18 per unit length increases. Therefore, the light intensity distribution in the vertical cross section of the light transmission region in the light guide 3 is uniform with a short optical path length.

  Therefore, since the length of the light guide unit 3 in the longitudinal direction can be shortened, the optical communication module 902 can be made smaller than the optical communication module 901 in FIG. 1, and the mobile phone can be downsized.

(Embodiment 3)
The conceptual diagram of the optical communication module 903 which is other embodiment which concerns on this invention 1st invention is shown in FIG. In the optical communication module 903, the same reference numerals as those used in FIG. 1 have the same functions and the same arrangement. The difference between the optical communication module 903 and the optical communication module 901 in FIG. 1 is that the light guide unit 3 has the reflective surface 38 instead of the reflective surface 18.

  The arrangement of the reflection surface 38 is the same as the arrangement of the reflection surface 18, but the reflection surface 38 is a diffusion plate that diffusely reflects incident light. The signal light A reflected by the reflecting surface 13 and incident on the light guide unit 3 is repeatedly scattered by the reflecting surface 38 and is disturbed to reach the emitting end 19 as emitted light B.

  Therefore, the optical communication module 903 can obtain the same effect as the optical communication module 901.

  Furthermore, since the light reflected by the reflecting surface 38 is branched in a plurality of directions, the number of times of reflection by the reflecting surface 38 per unit length increases. Therefore, the light intensity distribution in the vertical cross section of the light transmission region in the light guide 3 is uniform with a short optical path length.

  Therefore, since the length of the light guide 3 in the longitudinal direction can be shortened, the optical communication module 903 can be made smaller than the optical communication module 901 in FIG. 1, and the mobile phone can be miniaturized.

(Embodiment 4)
The conceptual diagram of the optical communication module 904 which is other embodiment which concerns on this invention 1st invention is shown in FIG. In the optical communication module 904, the same reference numerals as those used in FIG. 1 have the same functions and the same arrangement. The difference between the optical communication module 904 and the optical communication module 901 of FIG. 1 is that it is filled with a light scattering agent 44 that scatters the light transmitted through the tubular optical system 1.

  The signal light A from the light emitting element 4 is reflected by the reflecting surface 13, passes through the light scattering agent 44, is repeatedly reflected by the reflecting surface 18 inside the light guide unit 3, and is disturbed to be emitted light B to the emitting end 19. To reach.

  Therefore, the optical communication module 904 can obtain the same effect as the optical communication module 901.

  Further, since the signal light A propagates through the light scattering agent 44 until reaching the emission end 19, the signal light A continues to be scattered. Therefore, the light intensity distribution in the vertical cross section of the light transmission region in the light guide 3 is uniform with a short optical path length.

  Therefore, since the length of the light guide 3 in the longitudinal direction can be shortened, the optical communication module 904 can be made smaller than the optical communication module 901 in FIG. 1, and the mobile phone can be downsized.

(Embodiment 5)
The conceptual diagram of the optical communication module 905 which is other embodiment concerning this invention 1 is shown in FIG. In the optical communication module 905, the same reference numerals as those used in FIG. 1 have the same functions and the same arrangement. The difference between the optical communication module 905 and the optical communication module 901 in FIG. 1 is that the light direction changing unit 2 has a reflective surface 53 instead of the reflective surface 13.

  Although the function and arrangement of the reflecting surface 53 and the reflecting surface 13 in FIG. 1 are the same, the reflecting surface 53 is a concave reflecting surface in which the vicinity of the center of the reflecting surface 53 protrudes to the opposite side of the light emitting element 4.

  The signal light A radiated from the light emitting element 4 irradiates the reflecting surface 53, changes the propagation direction, and enters the light guide 3. The signal light A reaches the output end 19 as the output light B as described in the optical communication module of FIG.

  Therefore, the optical communication module 905 can obtain the same effect as the optical communication module 901.

  Further, since the reflecting surface 53 is a concave reflecting surface, the signal light A is reflected by the reflecting surface 53 and then concentrated on the focal point. After passing through the focal point, the signal light A diffuses so as to widen the far field pattern of the light emitting element 4. Therefore, the incident angle of the signal light A to the reflecting surface 18 is increased, and the number of reflections by the reflecting surface 18 per unit length is increased. Therefore, the light intensity distribution in the vertical cross section of the light transmission region in the light guide 3 is uniform with a short optical path length.

  Therefore, since the length of the light guide unit 3 in the longitudinal direction can be shortened, the optical communication module 905 can be made smaller than the optical communication module 901 in FIG. 1, and the mobile phone can be miniaturized.

(Embodiment 6)
The conceptual diagram of the optical communication module 906 which is other embodiment which concerns on this invention 1st invention is shown in FIG. In the optical communication module 906, the same reference numerals as those used in FIG. 1 have the same functions and the same arrangement. The difference between the optical communication module 906 and the optical communication module 901 in FIG. 1 is that the optical communication module 906 has the substrate 60 instead of the substrate 10.

  The function and configuration of the substrate 60 are the same as those of the substrate 10, but the portion where the light emitting element 4 is disposed is recessed.

  In the optical communication module 906, the light emitting element 4 irradiates the signal light A from the recessed position of the substrate 60. The signal light A reaches the output end 19 as the output light B as described in the optical communication module of FIG.

  Therefore, the optical communication module 906 can obtain the same effect as the optical communication module 901.

  Further, since the light emitting element 4 emits the signal light A from a position lower than the reflecting surface 18 on the substrate 60 side of the light guide unit 3, the light direction changing unit 2 receives the signal light A reflected by the reflecting surface 13 and the light emitting element 4. The light guide unit 3 can be coupled without being shielded by the wiring 9.

  Therefore, the optical communication module 906 can increase the light intensity of the outgoing light B emitted from the outgoing end 19 than the optical communication module 901.

(Embodiment 7)
The conceptual diagram of the optical communication module 907 which is other embodiment which concerns on this invention 1st invention is shown in FIG. 7, and the conceptual diagram of the optical communication module 908 is shown in FIG. In the optical communication module 907, the same reference numerals as those used in FIG. 1 have the same functions and the same arrangement. The difference between the optical communication module 907 and the optical communication module 901 in FIG. 1 is that the optical communication module 907 has the substrate 70 instead of the substrate 10, and the light emitting element 4 is mounted on the back surface of the substrate 70. . Further, the peripheral circuit 6 may be mounted on the back surface of the substrate 70 as in the optical communication module 908.

  The function and configuration of the substrate 70 are the same as those of the substrate 10, but a through hole 72 through which light passes from the back surface to the front surface of the substrate 70 is opened.

  The light emitting element 4 is mounted on the substrate 70 such that the upper surface is in contact with the substrate 70 and the portion from which light is emitted is located in the through hole 72.

  In the case of the optical communication module 907 of FIG. 7, the surface of the through hole 72 may be plated with a metal so that the front surface and the back surface of the substrate 70 can be electrically connected. When the light emitting element 4 is a surface emitting LD having electrodes on the upper surface, the surface of the through hole 72 is electrically connected to the peripheral circuit 6 mounted on the surface of the substrate 70 by contacting the plated metal.

  In the case of the optical communication module 908 of FIG. 8, the periphery of the through hole 72 may be plated with metal on the back surface of the substrate 70. When the light emitting element 4 is a surface emitting LD having an electrode on the upper surface, the plated portion is connected to the electric wiring on the back surface of the substrate 70 (not shown), and the peripheral circuit 6 and the light emitting element 4 are electrically connected. The

  Therefore, the optical communication module 907 and the optical communication module 908 do not need to connect the electrode and the electric wiring by the wiring 9.

  In the optical communication module 907 and the optical communication module 908, the light emitting element 4 irradiates the reflection surface 13 with the signal light A from the back surface of the substrate 70 through the through hole 72. The signal light A reaches the output end 19 as the output light B as described in the optical communication module of FIG.

  Therefore, the optical communication module 907 can obtain the same effect as the optical communication module 901.

  Further, since the light emitting element 4 emits the signal light A from the back surface of the substrate 70, the light direction changing unit 2 does not block the signal light A reflected by the reflecting surface 13 by the light emitting element 4 and the wiring 9. 3 can be combined.

  Furthermore, if the surface of the through hole 72 is a mirror surface, the signal light A is repeatedly disturbed by being repeatedly reflected from being transmitted through the through hole 72. Therefore, the light intensity distribution in the vertical cross section of the light transmission region in the light guide 3 is uniform with a short optical path length.

  Therefore, since the length of the light guide 3 in the longitudinal direction can be shortened, the optical communication module 907 and the optical communication module 908 can be made smaller than the optical communication module 901 in FIG. Can be planned.

  In the optical communication module 907 and the optical communication module 908, since the light emitting element 4 and the peripheral circuit 6 are mounted on the back surface of the substrate 70, the height of the light emitting element 4 or the peripheral circuit 6 is set on the base 400 of the mobile phone. Installed and installed. The interval may be filled with the resin 15.

  In the optical communication module 908, the surface side of the substrate 70 may be mounted on the cellular phone base 400 as shown in FIG.

(Embodiment 8)
The area of the cross section perpendicular to the light propagation direction in the light transmission region of the light guide portion of the tube optical system monotonously decreases from one end to the other end of the light guide portion of the tube optical system. May be.

  The conceptual diagram of the optical communication module 910 which is other embodiment which concerns on this invention 1st invention is shown in FIG. In the optical communication module 910, the same reference numerals as those used in FIGS. 1 and 6 have the same functions and the same arrangement. The difference between the optical communication module 910 and the optical communication module 906 in FIG. 6 is that the tube-type optical system 1 includes the light guide unit 103 instead of the light guide unit 3.

  The light guide unit 103 is the same as the arrangement of the light guide unit 3 in FIGS. 1 and 6, but the area of the vertical cross section of the light transmission region surrounded by the reflecting surface 18 is from the light direction conversion unit 2 side to the emission end 19. It decreases monotonously toward the side.

  The signal light A from the light emitting element 4 is converted in the propagation direction by the reflection surface 13 and coupled to the light guide unit 103. The signal light A reaches the output end 19 as the output light B as described in the optical communication module of FIG.

  Therefore, the optical communication module 908 can obtain the same effect as the optical communication module 901.

  Furthermore, since the area of the vertical cross section on the light direction changing section 2 side of the light guide section 103 is larger than the area of the vertical cross section of the light guide section 3 in the optical communication module 906 in FIG. The signal light A reflected by the direction conversion unit 2 can be collected.

  Further, by reducing the area of the vertical section of the light guide portion 103 toward the emission end 19, the light guide portion 103 can couple the outgoing light B to the optical fiber 300 without increasing the diameter of the optical fiber 300.

  Therefore, the light intensity of the emitted light B can be increased without increasing the luminance of the light emitting element 4, and the mobile phone can be used for a long time.

  Note that, as in the optical communication module 911 in FIG. 11, the reflective surface 18 that contacts the substrate 60 may also be arranged so as to increase the area of the vertical section on the light direction conversion unit 2 side of the light guide unit 3.

  The tube optical system 1 of the optical communication module 911 in FIG. 11 can collect more signal light A than the tube optical system 1 of the optical communication module 910 in FIG.

  Therefore, the optical communication module 911 can transmit an optical signal to another module more efficiently than the optical communication module 910.

(Embodiment 9)
In one embodiment according to the second invention of the present application, a light receiving element disposed on a substrate and having a light receiving direction in a normal direction of the substrate surface, and disposed on the substrate surface, the light from the incident end is specularly reflected or reflected. The light guide part propagating in the direction parallel to the substrate surface by total reflection, and the light propagation direction by specular reflection or total reflection of light from the light guide part at the reflection surface in the light propagation direction of the light guide part And a tube-type optical system having a light direction conversion unit that converts light into the light receiving direction of the light receiving element.

  The conceptual diagram of the optical communication module 921 which is one Embodiment which concerns on this invention 2nd invention is shown in FIG. In the optical communication module 912, the same reference numerals as those used in the optical communication module 901 in FIG. A difference between the optical communication module 912 and the optical communication module 901 in FIG. 1 is that the light receiving element 124 is provided instead of the light emitting element 4.

  The light receiving element 124 photoelectrically converts light incident on the light receiving surface and outputs an electrical signal. An example of the light receiving element 124 is a photodiode (PD) on the upper surface of a semiconductor layer in which a light receiving surface is stacked.

  The tube-type optical system 1 is the same as that described in the optical communication module 901 in FIG. 1, but the portion described as the emission end 19 in the optical communication module 901 in FIG. Is the incident end 129.

  The optical communication module 921 has the peripheral circuit 6, the tube-type optical system 1 and the connector 7 mounted on the surface of the substrate 10 as described in the optical communication module 901 of FIG. The light receiving element 124 fixes the side opposite to the light receiving surface to the substrate 10. Therefore, the light receiving element 124 receives light from above the substrate 10. Further, when the electrode of the light receiving element 124 is also on the light receiving surface side, the electrode and the electric wiring of the substrate 10 are connected by the wiring 9.

  The optical communication module 921 operates as described below. The signal light C from another module coupled from one end of the optical fiber 300 to the incident end 129 is repeatedly reflected by the reflection surface 18 inside the light guide unit 3 and is disturbed and propagates in the direction of the light direction conversion unit 2. Is done. The propagating light D is a signal light C disturbed, and the light intensity in the vertical section is uniform. The propagation light D is applied to the reflection surface 13 of the light direction conversion unit 2, and the propagation direction is changed to irradiate the light receiving element 124 from above the substrate 10. The light receiving element 124 converts the received light into an electrical signal and transmits it to the peripheral circuit 6 through the electrical wiring.

  Therefore, even if the near-field pattern at one end of the optical fiber 300 on the side connected to the incident end 129 is not uniform due to the bending of the optical fiber 300, the tubular optical system 1 further varies in the bending state of the optical fiber 300. Even if the near-field pattern fluctuates, the propagation light D can be stably irradiated onto the light receiving element 124.

  Therefore, the optical communication module 921 can stably receive optical data from other modules.

  Further, since the tube-type optical system 1 converts the light propagation direction into a direction parallel to the surface of the substrate 10, even if a light emitting element 124 that receives light from the normal direction of the surface of the substrate 10 is used, The height H of the communication module 921 can be reduced.

  Therefore, the optical communication module 921 can make the light intensity distribution of the light from the optical fiber 300 uniform, and can reduce the height from the substrate 10.

  Since the optical communication module 921 can be mounted on the surface of the cellular phone base 400 as shown in FIG. 12, both stable optical data transmission and thinning of the cellular phone can be achieved.

  The shape of the cross section perpendicular to the light propagation direction of the light propagation region surrounded by the reflection surface 18 of the light guide 3 is non-circular, for example, a polygon, a rounded M-square, a single closed curve, a multiple curve, or A line segment curve shape is preferred. As described in the optical communication module 901 in FIG. 1, since the length of the light guide unit 3 in the longitudinal direction can be shortened, the size of the optical communication module 921 can be reduced, and the mobile phone can be downsized. Can do.

  Furthermore, it is preferable that the cross section perpendicular to the light propagation direction of the light propagation region in one section of the light guide 3 is different from the cross section perpendicular to the light propagation direction of the light propagation region in the other section.

  For example, the shape of the vertical cross section of the light transmission region in the section on the light direction conversion unit 2 side of the light guide unit 3 is square, and the shape of the vertical cross section of the light transmission region in the section on the incident end 129 side of the light guide unit 3 is circular. It can be. The light propagates from the section on the incident end 129 side to the section on the light direction changing section 2 side, so that the propagation mode is disturbed, and the light intensity in the vertical section of the light transmission region of the light guide section 3 becomes uniform. Further, since the near-field pattern at one end of the optical fiber 300 is circular, the alignment between the incident end 129 and the optical fiber 300 is facilitated, and the signal light C is efficiently coupled from the optical fiber 300 to the light guide unit 3. Can do.

  Therefore, the optical communication module 921 can increase the light intensity of signal light from other modules, and can achieve power saving of the mobile phone.

(Embodiment 10)
The conceptual diagram of the optical communication module 923 which is other embodiment which concerns on this invention 2nd invention is shown in FIG. In the optical communication module 903, the same reference numerals as those used in the optical communication module 901 in FIG. 1 and the optical communication module 921 in FIG. The difference between the optical communication module 923 and the optical communication module 921 in FIG. 12 is that the light guide unit 3 has the reflective surface 38 instead of the reflective surface 18.

  The signal light C coupled to the light guide unit 3 is repeatedly scattered by the reflecting surface 38 and is disturbed to reach the light direction changing unit 2 as propagating light D. As described in the optical communication module 921 in FIG. 12, the light receiving element 124 can receive the propagation light D.

  Therefore, the optical communication module 923 can obtain the same effect as the optical communication module 921.

  Furthermore, since the light reflected by the reflecting surface 38 is branched in a plurality of directions, the number of times of reflection by the reflecting surface 38 per unit length increases. Therefore, the light intensity distribution in the vertical cross section of the light transmission region in the light guide 3 is uniform with a short optical path length.

  Therefore, since the length of the light guide unit 3 in the longitudinal direction can be shortened, the optical communication module 923 can be made smaller than the optical communication module 921 in FIG. 1, and the mobile phone can be downsized.

(Embodiment 11)
The conceptual diagram of the optical communication module 924 which is other embodiment which concerns on this invention 2nd invention is shown in FIG. In the optical communication module 924, the same reference numerals as those used in FIGS. 1, 4 and 12 have the same functions and the same arrangement. The difference between the optical communication module 924 and the optical communication module 921 of FIG. 12 is that the optical communication module 924 is filled with a light scattering agent 44 that scatters the light transmitted through the tubular optical system 1.

  The signal light C from the optical fiber 300 propagates in the filled light scattering agent 44, is repeatedly reflected by the reflection surface 18 inside the light guide 3, and is disturbed to be propagated light D to the light direction changer 2. To reach. As described in the optical communication module 921 in FIG. 12, the light receiving element 124 can receive the propagation light D.

  Therefore, the optical communication module 904 can obtain the same effect as the optical communication module 901.

  Furthermore, since the signal light C propagates through the light scattering agent 44 from the incident end 129 to the light receiving element 124, the signal light C continues to be scattered. Therefore, the light intensity distribution in the vertical cross section of the light transmission region in the light guide 3 is uniform with a short optical path length.

  Therefore, since the length of the light guide 3 in the longitudinal direction can be shortened, the optical communication module 924 can be made smaller than the optical communication module 921 in FIG. 12, and the mobile phone can be miniaturized.

(Embodiment 12)
The conceptual diagram of the optical communication module 925 which is other embodiment which concerns on this invention 1st invention is shown in FIG. In the optical communication module 925, the same reference numerals as those used in FIGS. 1, 5, and 12 have the same functions and the same arrangement. The difference between the optical communication module 925 and the optical communication module 921 of FIG. 1 is that the optical direction conversion unit 2 has a reflective surface 53 instead of the reflective surface 13.

  The signal light C from the optical fiber 300 reaches the light direction changing unit 2 as the propagation light D as described in the optical communication module 921 in FIG. In the light direction conversion unit 2, the reflection surface 53 converts the propagation direction of the propagation light D into the direction of the light receiving element 124.

  Therefore, the light receiving element 124 can receive the propagation light D, and the optical communication module 925 can obtain the same effect as the optical communication module 921.

  The reflection surface 53 is a concave reflection surface in which the vicinity of the center of the reflection surface 53 protrudes to the opposite side of the light receiving element 124. By designing the reflecting surface 53 so that the focal point is positioned on the light receiving surface of the light receiving element 124, the propagation light D is reflected by the reflecting surface 53 and then concentrated on the light receiving surface of the light receiving element 124.

  Accordingly, since the signal light C from the optical fiber 300 can be efficiently applied to the light receiving element 124, the optical communication module 925 can increase the light intensity of the optical signal from the other module, thereby reducing the power consumption of the mobile phone. be able to.

(Embodiment 13)
The conceptual diagram of the optical communication module 926 which is other embodiment which concerns on this invention 2nd invention is shown in FIG. In the optical communication module 926, the same reference numerals as those used in FIG. 1, FIG. 6, and FIG. The difference between the optical communication module 926 and the optical communication module 921 of FIG. 1 is that the optical communication module 926 has a substrate 60 instead of the substrate 10.

  The function and configuration of the substrate 60 are the same as those of the substrate 10, but the portion where the light receiving element 124 is disposed is recessed.

  The signal light C from the optical fiber 300 reaches the light direction changer 2 as the propagation light D as described in the optical communication module 921 in FIG. 12, and the light receiving element 124 can receive the propagation light D.

  Therefore, the optical communication module 926 can obtain the same effect as the optical communication module 921.

  Further, since the light receiving element 124 is located at a position lower than the reflecting surface 18 on the substrate 60 side of the light guide unit 3, the propagation light D is reflected by the reflecting surface 13 without being partially shielded by the light receiving element 124 and the wiring 9. Thus, the light receiving element 124 can be irradiated. In addition, since the light receiving element 124 is located at a position lower than the reflection surface 18 on the substrate 60 side of the light guide unit 3, it is possible to reduce reception of unnecessary reflected light other than the propagation light D reflected by the reflection surface 13.

  Accordingly, since the signal light C from the optical fiber 300 can be efficiently applied to the light receiving element 124, the optical communication module 926 can increase the light intensity of the optical signal from the other module, thereby saving power of the mobile phone. be able to.

(Embodiment 14)
The conceptual diagram of the optical communication module 927 which is other embodiment which concerns on this invention 2nd invention is shown in FIG. 17, and the conceptual diagram of the optical communication module 928 is shown in FIG. In the optical communication module 927 and the optical communication module 928, the same reference numerals as those used in FIG. 1, FIG. 7, FIG. 8, and FIG. The difference between the optical communication module 927 and the optical communication module 921 in FIG. 12 is that the optical communication module 927 has the substrate 70 instead of the substrate 10, and the light receiving element 124 is mounted on the back surface of the substrate 70. . Further, the peripheral circuit 6 may be mounted on the back surface of the substrate 70 as in the optical communication module 908.

  The light receiving element 124 is mounted on the substrate 70 such that the upper surface is in contact with the substrate 70 and the light receiving surface is positioned in the through hole 72.

  In the case of the optical communication module 927 of FIG. 17, the surface of the through hole 72 may be plated with a metal.

  In the case of the optical communication module 928 in FIG. 18, the periphery of the through hole 72 may be plated with metal on the back surface of the substrate 70.

  Therefore, as described in the optical communication module 907 in FIG. 7 and the optical communication module 908 in FIG. 8, the optical communication module 927 and the optical communication module 928 do not need to connect the electrode and the electrical wiring by the wiring 9. To do.

  The signal light C from the optical fiber 300 reaches the optical direction conversion unit 2 as the propagation light D as described in the optical communication module 921 in FIG. 12, and the propagation direction is converted.

  The propagation light D whose propagation direction has been converted irradiates the light receiving element 124 through the through hole 72, and the light receiving element 124 can receive the propagation light D.

  Therefore, the optical communication module 927 and the optical communication module 928 can obtain the same effects as the optical communication module 921.

  Further, since the light receiving element 124 is on the back surface on the substrate 70 side, the propagation light D is partially reflected by the reflecting surface 13 without being shielded by the light receiving element 124 and the wiring 9, and can irradiate the light receiving element 124. Further, since the light receiving element 124 is on the back surface on the substrate 70 side, it is possible to reduce the reception of unnecessary reflected light other than the propagation light D reflected by the reflecting surface 13.

  Furthermore, if the surface of the through hole 72 is a mirror surface, the propagating light D is repeatedly reflected and disturbed while being transmitted through the through hole 72. Therefore, even if the light guide 3 is present, the light intensity distribution on the light receiving surface of the light receiving element 124 becomes uniform with a short optical path length.

  Therefore, since the length of the light guide 3 in the longitudinal direction can be shortened, the optical communication module 927 and the optical communication module 928 can be made smaller than the optical communication module 921 in FIG. Can be planned.

  In the optical communication module 927 and the optical communication module 928, since the light receiving element 124 and the peripheral circuit 6 are mounted on the back surface of the substrate 70, the height of the light receiving element 124 or the peripheral circuit 6 is set on the base 400 of the mobile phone. Installed and installed. The interval may be filled with the resin 15.

  In the optical communication module 928, the surface side of the substrate 70 may be mounted on the cellular phone base 400 as shown in FIG.

(Embodiment 15)
The area of the cross section perpendicular to the light propagation direction in the light transmission region of the light guide portion of the tube optical system monotonously decreases from one end to the other end of the light guide portion of the tube optical system. May be.

  The conceptual diagram of the optical communication module 930 which is other embodiment which concerns on this invention 2nd invention is shown in FIG. In the optical communication module 930, the same reference numerals as those used in FIGS. 1, 6, 12, and 16 have the same functions and the same arrangement. The difference between the optical communication module 930 and the optical communication module 906 in FIG. 16 is that the tube-type optical system 1 includes the light guide unit 203 instead of the light guide unit 3.

  The light guide unit 203 is the same as the arrangement of the light guide unit 3 in FIGS. 1 and 6, but the area of the vertical cross section of the light transmission region surrounded by the reflective surface 18 is from the incident end 129 side of the light direction conversion unit 2. It decreases monotonously toward the side.

  The signal light C from the optical fiber 300 reaches the light direction changer 2 as the propagation light D as described in the optical communication module 921 in FIG. 12, and the light receiving element 124 can receive the propagation light D.

  Therefore, the optical communication module 930 can obtain the same effect as the optical communication module 921.

  Further, since the area of the vertical cross section on the light direction conversion section 2 side of the light guide section 203 is smaller than the area of the vertical cross section on the incident end 129 side, the propagation light D is concentrated in a narrow region, and the light intensity of the propagation light D And the light can be concentrated on the light receiving surface of the light receiving element 124.

  Accordingly, since the signal light C from the optical fiber 300 can be efficiently irradiated onto the light receiving element 124, the light intensity of the optical signal from another module can be reduced, and the power saving of the mobile phone can be achieved.

  Note that, as in the optical communication module 931 in FIG. 21, the reflective surface 18 that contacts the substrate 60 may also be arranged so that the area of the vertical cross section on the light direction conversion unit 2 side of the light guide unit 203 is reduced.

  The tubular optical system 1 of the optical communication module 931 in FIG. 21 can concentrate the propagation light D from the tubular optical system 1 of the optical communication module 930 in FIG.

  Therefore, the optical communication module 931 can receive optical signals from other modules more efficiently than the optical communication module 930.

(Embodiment 16)
The conceptual diagram of the optical communication module 946 which is embodiment which combined this invention 1st invention and this application 2nd invention is shown in FIG. In the optical communication module 946, the same reference numerals as those used in FIG. 1, FIG. 6, FIG. 12, and FIG. The difference between the optical communication module 946 and the optical communication module 906 of FIG. 6 is that the light emitting element 4 and the light receiving element 124 are arranged in parallel at the recessed position of the substrate 60.

  The tube-type optical system 1 is the same as that described in the optical communication module 901 in FIG. 1, but since the light propagates in both directions, the portion described as the emission end 19 in the optical communication module 901 in FIG. The connection end 229 is used.

  The signal light A emitted from the light emitting element 4 reaches the connection end 229 as the outgoing light B as described in the optical communication module 901 of FIG. Therefore, the optical communication module 946 can obtain the same effect as the optical communication module 906.

  On the other hand, the signal light C (not shown) from the optical fiber 300 reaches the light direction changing unit 2 as the propagation light D as described in the optical communication module 921 of FIG. 12 or FIG. D can be received. Therefore, the optical communication module 946 can obtain the same effect as the optical communication module 926.

  Since the optical communication module 946 can bidirectionally transmit optical data with the single optical fiber 300, the optical communication module for transmission and reception is unnecessary, and the mobile phone can be miniaturized.

(Embodiment 17)
The conceptual diagram of the optical communication module 947 which is other embodiment which combined this invention 1st invention and this application 2nd invention is shown in FIG. In the optical communication module 947, the same reference numerals as those used in FIGS. 1, 6, 12, 16, and 22 have the same functions and the same arrangement. The difference between the optical communication module 947 and the optical communication module 946 in FIG. 22 is that a light shielding plate 235 that shields light is disposed between the light emitting element 4 and the light receiving element 124.

  Therefore, the optical communication module 947 can obtain the same effect as the optical communication module 946 of FIG.

  Further, the light shielding plate 235 prevents light from the light emitting element 4 reflected by the reflecting surface 13 and the reflecting surface 18 from entering the light receiving element 124.

  Accordingly, since the light receiving element 124 does not receive the signal light A from the light emitting element 4, the optical communication module 947 can avoid malfunction even when the light emitting element 4 and the light receiving element 124 are arranged, and maintain the reliability of optical data transmission. can do.

(Embodiment 18)
The conceptual diagram of the optical communication module 948 which is other embodiment which combined this invention 1st invention and this application 2nd invention is shown in FIG. In the optical communication module 948, the same reference numerals as those used in FIG. 1, FIG. 6, FIG. 12, FIG. The difference between the optical communication module 948 and the optical communication module 946 of FIG. 22 is that the light direction changing unit 2 has a reflective surface 243 instead of the reflective surface 13.

  Although the function and arrangement of the reflecting surface 243 and the reflecting surface 13 in FIG. 1 are the same, the reflecting surface 243 is composed of a portion 243a and a portion 243b. The portion 243 a of the reflecting surface 243 is located in the light irradiation direction of the light emitting element 4, and the portion 243 b of the reflecting surface 243 is located in the light receiving direction of the light receiving element 124. The angle formed by the portion 243 a of the reflective surface 243 with the surface of the substrate 60 is different from the angle formed by the portion 243 b of the reflective surface 243 with the surface of the substrate 60.

  The signal light A radiated from the light emitting element 4 irradiates the portion 243 a of the reflecting surface 243, changes the propagation direction, and enters the light guide unit 3. The signal light A reaches the connection end 229 as the outgoing light B as described in the optical communication module 901 of FIG.

  Therefore, the optical communication module 948 can obtain the same effect as the optical communication module 906.

  On the other hand, the signal light C (not shown) from the optical fiber 300 reaches the light direction changer 2 as the propagation light D as described in the optical communication module 921 in FIG. The light receiving element 124 receives the light reflected by the portion 243b. Therefore, the optical communication module 948 can obtain the same effect as the optical communication module 926.

  Therefore, the optical communication module 948 can perform bi-directional optical communication in the same manner as the optical communication module 946 in FIG.

  Furthermore, the light receiving element 124 can avoid receiving the signal light A by designing the angle of the portion 243 a of the reflecting surface 243 so that the signal light A does not reflect to the light receiving element 124.

  Therefore, the optical communication module 948 can obtain the same effect as the optical communication module 947 without having the light shielding plate 235 of FIG.

(Embodiment 19)
The conceptual diagram of the optical communication module 949 which is other embodiment which combined this invention 1st invention and this application 2nd invention is shown in FIG. In the optical communication module 949, the same reference numerals as those used in FIGS. 1, 6, 12, 16, 22, and 24 have the same functions and the same arrangement. The difference between the optical communication module 949 and the optical communication module 948 of FIG. 22 is that the tube-type optical system 1 of the optical communication module 949 has a light guide 253 instead of the light guide 3.

  The light guide unit 253 has the same function and the same arrangement as the light guide unit 3, but has a double tube structure in which the outgoing light guide unit 253a is arranged in the light propagation region.

  The outgoing light guide unit 253a has a reflective surface 258 having the same configuration and function as the reflective surface 8 described in the optical communication module 901 of FIG. 1, and the light is specularly reflected or totally reflected by the reflective surface 258 and the substrate 60. It propagates in a parallel direction and is guided to the connection end 229.

  The size of the light propagation region of the outgoing light guide 253 a on the surface of the connection end 229 is designed to be smaller than the size of the core in the vertical cross section of the optical fiber 300. The outgoing light guide 253a is disposed at a position where the signal light A reflected by the reflecting surface 243a can enter the end opposite to the connection end 229 of the outgoing light guide 253a. Further, the outgoing light guide 253 a is disposed at a position where the light from the outgoing light guide 253 a can be coupled near the center of the core of the optical fiber 300 at the connection end 229.

  Therefore, even if there is an assembly error between the optical fiber 300 and the outgoing light guide 253a, the outgoing light guide 253a can couple all of the outgoing light B to the fiber 300.

  On the other hand, the size of the light propagation region of the light guide 253 including the outgoing light guide 253 a on the surface of the connection end 229 is designed to be larger than the size of the core in the vertical cross section of the optical fiber 300.

  Therefore, even if there is an assembly error between the optical fiber 300 and the light guide unit 253, the optical fiber 300 can couple all the signal light C to the light guide unit 253.

  The optical communication module 949 can perform optical communication in both directions as described with reference to the optical communication module 948 in FIG. 24, and the same effect can be obtained. Further, the optical communication module 949 can reduce the alignment accuracy with the optical fiber 300.

  The tubular optical system of the optical communication module of the present invention can be used as a lighting device or a laser marking device.

It is a conceptual diagram of the optical communication module 901 which is the Example which concerns on this invention 1st invention. It is a conceptual diagram of the optical communication module 902 which is an Example which concerns on this invention 1st invention. It is a conceptual diagram of the optical communication module 903 which is an Example based on 1st invention of this application. It is a conceptual diagram of the optical communication module 904 which is an Example which concerns on 1st invention of this application. It is a conceptual diagram of the optical communication module 905 which is the Example which concerns on this invention 1st invention. It is a conceptual diagram of the optical communication module 906 which is an Example based on 1st invention of this application. It is a conceptual diagram of the optical communication module 907 which is an Example which concerns on 1st invention of this application. It is a conceptual diagram of the optical communication module 908 which is an Example which concerns on 1st invention of this application. It is a conceptual diagram of the optical communication module 909 which is an Example based on 1st invention of this application. It is a conceptual diagram of the optical communication module 910 which is the Example which concerns on this invention 1st invention. It is a conceptual diagram of the optical communication module 911 which is an Example which concerns on 1st invention of this application. It is a conceptual diagram of the optical communication module 921 which is the Example which concerns on 2nd invention of this application. It is a conceptual diagram of the optical communication module 923 which is the Example which concerns on 2nd invention of this application. It is a conceptual diagram of the optical communication module 924 which is an Example which concerns on 2nd invention of this application. It is a conceptual diagram of the optical communication module 925 which is the Example which concerns on 2nd invention of this application. It is a conceptual diagram of the optical communication module 926 which is the Example which concerns on 2nd invention of this application. It is a conceptual diagram of the optical communication module 927 which is an Example which concerns on 2nd invention of this application. It is a conceptual diagram of the optical communication module 928 which is an Example which concerns on 2nd invention of this application. It is a conceptual diagram of the optical communication module 928 which is an Example which concerns on 2nd invention of this application. It is a conceptual diagram of the optical communication module 930 which is an Example which concerns on 2nd invention of this application. It is a conceptual diagram of the optical communication module 931 which is the Example which concerns on 2nd invention of this application. It is a conceptual diagram of the optical communication module 946 which is an Example which combined this invention 1st invention and this application 2nd invention. It is a conceptual diagram of the optical communication module 947 which is an Example which combined this invention 1st invention and this invention 2nd invention. It is a conceptual diagram of the optical communication module 948 which is an Example which combined the 1st invention of this application and the 2nd invention of this application. It is a conceptual diagram of the optical communication module 949 which is an Example which combined this invention 1st invention and this application 2nd invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tube type optical system 2 Light direction conversion part 3,103,203,253 Light guide part 4 Light emitting element 6 Peripheral circuit 7 Connector 9 Wiring 10,60,70 Board | substrate 13,18,23,38,53,243,258 Reflection Surface 15 Resin 19 Emission end 44 Light scattering agent 72 Through hole 124 Light receiving element 129 Incident end 229 Connection end 235 Light shielding plate 243a, 243b Reflection surface 243 portion 253a Emission light guide unit 300 Optical fiber 400 Mobile phone base A, C Signal Light B Emission light D Propagation light H Height α of optical communication module 901 to 908, 910, 911, 921, 923 to 928, 930, 931, 946 to 949 Optical communication module

Claims (9)

A light emitting element disposed on a substrate, the light emitting direction being a normal direction of the substrate surface;
A light direction conversion unit disposed on the substrate and converting a light propagation direction by specularly reflecting or totally reflecting light from the light emitting element at a reflecting surface in a light emission direction of the light emitting element, and the light direction converting unit A tube-type optical system having a light guide that propagates light from the mirror in a direction parallel to the substrate surface by specular reflection or total reflection and guides the light to the exit end;
An optical communication module comprising: A light receiving element disposed on a substrate and having a light receiving direction in a normal direction of the substrate surface;
The light guide unit disposed on the substrate surface and propagates light from the incident end in a direction parallel to the substrate surface by specular reflection or total reflection, and the reflection surface in the light propagation direction of the light guide unit. A tube-type optical system having a light direction conversion unit that mirror-reflects or totally reflects light from the light unit to convert the light propagation direction to the light receiving direction of the light receiving element;
An optical communication module comprising:   The shape of the cross section perpendicular | vertical to the propagation direction of the light of the light propagation area | region in the one part or all part of the said light guide part of the said tubular optical system is a polygon, The Claim 1 or 2 characterized by the above-mentioned. Optical communication module.   The cross-sectional shape perpendicular to the light propagation direction of the light propagation region in a part or all of the light guide section of the tube-type optical system is a rounded M square (M is an integer of 3 or more). The optical communication module according to claim 1 or 2.   The cross section perpendicular to the light propagation direction of the light propagation region in a part or all of the light guide section of the tube-type optical system is a shape surrounded by a single closed curve having a plurality of curvatures. The optical communication module according to claim 1 or 2, characterized in that   The cross section perpendicular to the light propagation direction of the light propagation region in a part or all of the light guide section of the tubular optical system has a shape surrounded by connecting ends of a plurality of curves, and the plurality The optical communication module according to claim 1, wherein the optical communication module has a shape with a connection point of the curve as a singular point.   The cross section perpendicular to the light propagation direction of the light propagation region in a part or all of the light guide section of the tubular optical system is connected to the end of at least one line segment and the end of at least one curve. The optical communication module according to claim 1, wherein the optical communication module has an enclosed shape.   The cross section perpendicular to the light propagation direction of the light propagation region in one section of the light guide section of the tubular optical system is different from the cross section perpendicular to the light propagation direction of the light propagation region in the other section. The optical communication module according to claim 1 or 2. The area of the cross section perpendicular to the light propagation direction in the light transmission region of the light guide portion of the tube optical system monotonously decreases from one end to the other end of the light guide portion of the tube optical system. The optical communication module according to claim 1, wherein the optical communication module is an optical communication module.

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