JP2008141152A - Light-emitting module and light-receiving module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress widening the caliber of a lens and to increase an acceptance angle of outgoing light from a light source to allow high efficiency and reduction of brightness nonuniform of the outgoing light. <P>SOLUTION: A plurality of second refraction sides 122 and a plurality of first refraction sides are alternatively arranged at an outgoing side of a lens member 120, and a catoptric light from a plurality of a reflection sides 123 provided at an incoming side is refracted at a predetermined angle at the plurality of second refraction sides 122 to be output. This leads to that an excellent light-emitting module 100 in which a radiation intensity is increased to improve an efficiency without widening the caliber of the lens member 120, and in which the brightness nonuniform of the outgoing light is improved, can be obtained. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an optical space in an optical space transmission system in which information data such as a video signal, an audio signal, and a digital data signal is transmitted as an optical signal through a free space between an optical space transmitter and an optical space receiver. The present invention relates to a light emitting module and a light receiving module used for a transmitter, an optical space receiver, and the like.

  An optical space transmission system that transmits an optical signal through free space is characterized by being capable of high-speed transmission compared to wireless transmission using radio waves due to the broadband nature of light. When an optical space transmitter and an optical space receiver of this optical space transmission system are incorporated into a portable device, the light emitting module and the light receiving module used for it are also required to be thin and small.

  The need for thinning is not limited to light emitting modules and light receiving modules used in optical space transmitters and optical space receivers, but also in light emitting modules such as lighting devices incorporated in portable devices. As a conventional light-emitting module that can be made thin, there is a module that uses a Fresnel lens in order to change an emission angle of light emitted from a light source (see, for example, Patent Document 1). FIG. 29 shows a light-emitting module of a conventional lighting device described in Patent Document 1.

  In FIG. 29, the light emitting module is composed of a light source 1 and a lens 2. By forming a plurality of refracting surfaces 3 on the exit surface side of the lens 2, the lens 2 acts as a Fresnel lens, and the light emitted from the light source 1 can be refracted to obtain output light substantially parallel to the optical axis 4. The Fresnel lens is characterized in that it is easy to reduce the thickness because the lens portion can be thinned in a plate shape as compared with a spherical lens or aspherical lens having a continuous curved surface. However, due to processing limitations such as the tilt angle of the refracting surface 3, the acceptance angle 2β of the emitted light from the light source 1 is limited. For this reason, when the light source 1 has a wide emission angle, light cannot be efficiently emitted from the light emitting module.

  Moreover, the said patent document 1 was also shown about the structure which expands the acceptance angle of the emitted light from the light source 1. FIG. FIG. 30 shows a light emitting module of another conventional illumination device described in Patent Document 1. In FIG.

  In FIG. 30, the lens 12 is provided with a refracting surface 13 similar to that in FIG. 29, and a plurality of reflecting surfaces 15 are further provided on the incident surface side. A part of light emitted from the light source 1 having an emission angle of 2β or more is reflected by the reflecting surface 15 and is emitted from the flat portion 16 on the emitting surface side of the lens 2. Thereby, a part of light having an emission angle of 2β or more from the light source 1 is also emitted.

  Further, even in a conventional light receiving module that converts incident light into an electrical signal, there is a module that can be thinned by using a Fresnel lens as a condensing lens for condensing incident light on a light receiving element (for example, , See Patent Document 2). FIG. 32 shows a conventional light receiving module described in Patent Document 2. In FIG.

In FIG. 32, the light receiving module 20 includes a condenser lens 21 and a light receiving element 22. The condensing lens 21 is a Fresnel lens provided with a plurality of refractive surfaces 23 on the incident surface, and incident light is condensed on the light receiving element by the condensing lens 21. By using a Fresnel lens for the condensing lens 21, it is possible to make it thinner than using a convex lens such as a spherical surface.
JP 2005-49367 A Japanese Patent Laid-Open No. 3-60080

  FIG. 31 is an enlarged view of a portion A of the light emitting module in the conventional configuration shown in FIG. 29, and there is an ineffective portion of the lens through which light emitted from the light source 1 does not pass at the tip of the refractive surface 13. For this reason, the emitted light from the lens 12 has a problem of uneven brightness.

  In the light emitting module in the conventional configuration shown in FIG. 30, the reflected light from the reflecting surface 15 is emitted from the surrounding flat portion 16 where the refracting surface 13 on the emitting surface side is not formed. The diameter d2 larger than the diameter d1 is required, and the aperture of the lens 12 becomes large. When the light source is a light emitting diode (LED) or the like, the emitted light in the direction perpendicular to the optical axis 14 often has a large radiation power, but the radiation in the direction perpendicular to the optical axis 14 is performed. There was also a problem that light could not be used.

  FIG. 33 is an enlarged view of part B of the light receiving module in the conventional configuration shown in FIG. As shown in FIG. 33, when a Fresnel lens is used as the condenser lens 21, there is an ineffective portion of the lens that cannot collect incident light at the tip of the refractive surface 13. For this reason, the non-condensing area | region of incident light exists and had the subject that the efficiency of condensing fell.

  The present invention solves the above-mentioned conventional problems, and improves the efficiency by reducing the unevenness of the brightness of the emitted light and expanding the acceptance angle of the emitted light from the light source 1 while suppressing the enlargement of the aperture of the lens. It is an object of the present invention to provide a light emitting module that can be used. It is another object of the present invention to provide a light emitting module that can improve efficiency by using light emitted from a light source in a direction perpendicular to the optical axis of the light source and reduce unevenness in brightness of the emitted light. To do. It is another object of the present invention to provide a light receiving module with high light collecting efficiency by effectively guiding incident light in a non-light collecting region to a light receiving element.

  In order to solve the above-described conventional problems, a light emitting module according to a first aspect of the present invention includes a light source and a lens member that changes light from the light source to a predetermined directivity characteristic. A plurality of first refracting surfaces and a plurality of second refracting surfaces are alternately arranged substantially coaxially, and the first refracting surface refracts part of the emitted light from the light source. The lens member further includes a reflecting portion at a position where a part of the emitted light from the light source refracted by the first refracting surface does not pass through the lens member. A part is guided to the second refracting surface by being reflected by the reflecting portion, and is emitted at a predetermined angle by being refracted by the second refracting surface.

  According to the light emitting module of the first aspect of the invention, it is possible to improve the efficiency by using the light having a wide emission angle of the light source while suppressing the enlargement of the aperture of the lens, and to reduce the unevenness of the brightness of the emitted light. It is possible to obtain a light emitting module that can be realized.

  A light emitting module according to a second aspect of the present invention is an invention dependent on the first aspect, wherein the reflecting portion is constituted by a total reflection surface.

  According to the light emitting module of the second invention, it is possible to easily form the reflecting portion on the lens member.

  According to a third aspect of the present invention, there is provided a light emitting module according to the first or second aspect, wherein the light source is disposed in the lens member.

  According to a fourth aspect of the present invention, there is provided a light emitting module according to the first or second aspect, wherein the lens member is partially refracted from the light source refracted by the first refractive surface. An incident surface is provided at a position where the incident light is not transmitted, and the light incident from the incident surface is reflected by the reflecting portion to the second refracting surface and refracted by the second refracting surface to be emitted at a predetermined angle. .

  According to the light emitting modules of the third and fourth inventions, a highly efficient light emitting module can be obtained with a simple configuration.

  An optical space signal transmission device according to a fifth aspect of the present invention is an invention dependent on any one of the first to fourth aspects, wherein the reflecting portion is provided on each of the plurality of second refracting surfaces. It comprises a plurality of corresponding reflecting surfaces, and the reflected light from the plurality of reflecting surfaces is emitted at a predetermined angle by being refracted by the corresponding second refracting surfaces.

  According to the light emitting module of the fifth aspect of the invention, light with a wide emission angle of the light source can be efficiently guided to the plurality of second refracting surfaces to obtain a highly efficient light emitting module.

  An optical space signal transmission device according to a sixth invention of the present invention is an invention dependent on any one of the first to fifth inventions, wherein an installation range of the reflecting portion viewed from the optical axis side of the light source is The configuration is such that it is within the installation range of the first refractive surface as viewed from the optical axis side of the light source.

  According to the light emitting module of the sixth aspect of the invention, light having a wide emission angle from the light source can be used without enlarging the aperture of the lens, and a highly efficient light emitting module can be obtained.

  According to a seventh aspect of the present invention, there is provided a light emitting module comprising a light source, a lens member that changes light from the light source to a predetermined directivity, and a reflecting member that reflects light from the light source. A plurality of first refracting surfaces and a plurality of second refracting surfaces are alternately arranged substantially coaxially on the emission side of the first refracting surface, and the first refracting surface is a part of the emitted light from the light source. The reflection member is disposed at a position where a part of the emitted light from the light source refracted by the first refracting surface does not pass, and the emitted light from the light source. Is reflected by the reflecting member so as to reach the second refracting surface, and is refracted by the second refracting surface to be emitted at a predetermined angle.

  According to the light emitting module of the seventh aspect of the invention, a light emitting module that can utilize light having a wide emission angle from a light source, can be highly efficient, and can reduce unevenness in the brightness of emitted light. Obtainable.

  An optical space signal transmission device according to an eighth aspect of the present invention is an invention according to the seventh aspect, wherein the reflecting member reflects light emitted from a side surface of the light source. .

  According to the light emitting module of the eighth aspect of the invention, it is possible to obtain a highly efficient light emitting module by effectively using the light emitted from the side surface of the light source.

  According to a ninth aspect of the present invention, there is provided the light emitting module according to the seventh or eighth aspect, wherein the lens member has a reflecting portion, and the reflected light of the reflecting member is reflected by the lens member. After being reflected by the portion, the light is refracted by the second refracting surface to be emitted at a predetermined angle.

  According to the light emitting module of the ninth aspect, the reflecting member can be reduced in size.

  A light emitting module according to a tenth aspect of the present invention is an invention according to the ninth aspect, wherein the reflecting section is composed of a plurality of reflecting surfaces corresponding to the plurality of second refracting surfaces, respectively. The reflected light from the plurality of reflecting surfaces is refracted by the corresponding second refracting surfaces to be emitted at a predetermined angle.

  According to the light emitting module of the tenth aspect of the invention, light with a wide emission angle of the light source can be efficiently guided to the plurality of second refracting surfaces to obtain a highly efficient light emitting module.

  A light emitting module according to an eleventh aspect of the present invention is an invention dependent on the seventh or eighth aspect, wherein the lens member has a third refracting portion, and the reflected light of the reflecting member is transmitted to the lens. After being refracted by the third refracting portion of the member, the light is emitted at a predetermined angle by being refracted by the second refracting surface.

  According to the light emitting module of the eleventh aspect, the reflecting member can be reduced in size.

  A light emitting module according to a twelfth aspect of the present invention is an invention according to the eleventh aspect, wherein the third refracting portion is a plurality of third refracting surfaces corresponding to the plurality of second refracting surfaces, respectively. The refracted light from the plurality of third refracting surfaces is refracted by the corresponding plurality of second refracting surfaces to be emitted at a predetermined angle.

  According to the light emitting module of the twelfth aspect of the present invention, light with a wide emission angle of the light source can be efficiently guided to the plurality of second refracting surfaces to obtain a highly efficient light emitting module.

  A light emitting module according to a thirteenth aspect of the present invention includes a light source and a lens member, and a plurality of first refracting surfaces and a plurality of second refracting surfaces are disposed on the exit side of the lens member, The first refracting surface emits at a predetermined angle by refracting a part of the emitted light from the light source, and the lens member further includes a reflecting part or a refracting part, and the other part from the light source. The emitted light is reflected or refracted by the reflecting portion or the refracting portion to be guided to the second refracting surface, and is refracted by the second refracting surface to be emitted at a predetermined angle.

  According to a fourteenth aspect of the present invention, there is provided a light emitting module comprising a light source, a lens member, and a reflecting member or a refracting member. The first refracting surface emits at a predetermined angle by refracting a part of the emitted light from the light source, and the other part of the emitted light from the light source. The light is reflected or refracted by the reflecting member or the refracting member to lead to the second refracting surface, and is refracted by the second refracting surface to emit at a predetermined angle.

  According to the light emitting module of the thirteenth or fourteenth aspect of the present invention, it is possible to increase the efficiency by using the light having a wide emission angle while suppressing the enlargement of the aperture of the lens, and uneven brightness of the emitted light. It is possible to obtain a light emitting module capable of reducing the above.

  A light emitting module according to a fifteenth aspect of the present invention is an invention according to any one of the first to fourteenth aspects, wherein the plurality of second refracting surfaces are moved from the light source to the first refracting surface. Is formed at an angle substantially along the ray of the outgoing light that reaches.

  According to the light emitting module of the fifteenth aspect, a plurality of second refracting surfaces can be formed without hindering light emitted from the plurality of first refracting surfaces.

  According to a sixteenth aspect of the present invention, there is provided a light receiving module comprising a light receiving element and a lens member for condensing light onto the light receiving element. The second refracting surfaces are alternately arranged substantially coaxially, and the first refracting surface condenses light in a direction toward the light receiving element by refracting a part of incident light, and The lens member further includes a reflecting portion at a position where the light refracted and collected by the first refracting surface does not pass, and refracting the other part of the incident light by the second refracting surface. Light is condensed in a direction toward the light receiving element by being guided to the reflecting portion and reflected by the reflecting portion.

  According to the light receiving module of the sixteenth aspect of the present invention, it is possible to obtain a light receiving module with improved light collection efficiency while suppressing an increase in lens aperture.

  A light receiving module according to a seventeenth aspect of the present invention is an invention dependent on the sixteenth aspect, wherein the reflecting portion is constituted by a total reflection surface.

  According to the light receiving module of the seventeenth aspect of the present invention, it is possible to obtain a light receiving module that has a simple lens configuration and has improved light collection efficiency while suppressing an increase in the diameter of the lens.

  The light-receiving module according to an eighteenth aspect of the present invention is an invention dependent on the sixteenth or seventeenth invention, wherein the light-receiving element is arranged in the lens member.

  According to the light receiving module of the eighteenth aspect of the present invention, it is possible to obtain a light receiving module with improved light collection efficiency while suppressing an increase in the diameter of the lens with a simple structure of the light receiving module in which the lens member and the light receiving element are integrated. Can do.

  The light-receiving module according to a nineteenth aspect of the present invention is an invention according to the sixteenth or seventeenth aspect, wherein the lens member is refracted by the first refracting surface and condensed onto the light-receiving element. An exit surface is provided at a position where light is not transmitted, and another part of the incident light is refracted by the second refracting surface and guided to the reflecting portion, reflected by the reflecting portion and emitted from the emitting surface, The light is condensed in the direction toward the light receiving element.

  According to the light receiving module of the nineteenth aspect of the present invention, the expansion of the aperture of the lens is suppressed without affecting the light collection efficiency for the light that is refracted by the first refracting surface and collected on the light receiving element. A light receiving module with improved light collection efficiency can be obtained.

  The light-receiving module according to a twentieth aspect of the present invention is an invention dependent on any one of the sixteenth to nineteenth aspects, wherein a plurality of the reflecting portions are respectively corresponding to the plurality of second refracting surfaces. The light is condensed in the direction toward the light receiving element by reflecting the refracted light from the plurality of second refracting surfaces by the corresponding plurality of reflecting surfaces.

  According to the light receiving module of the twentieth aspect of the present invention, it is possible to obtain a light receiving module that increases the light collection efficiency while suppressing the thickness of the lens and suppressing the enlargement of the diameter of the lens.

  A light receiving module according to a twenty-first aspect of the present invention is an invention dependent on any one of the sixteenth to twentieth inventions, wherein an installation range of the reflecting portion viewed from the optical axis direction of the lens member is The lens member is configured to be within an installation range of the first refracting surface as viewed from the optical axis direction of the lens member.

  According to the light receiving module of the twentieth aspect of the present invention, it is possible to obtain a light receiving module with improved light collection efficiency without enlarging the diameter of the lens by installing the reflecting portion.

  A light receiving module according to a twenty-second aspect of the present invention includes a light receiving element, a lens member that collects light to the light receiving element, and a reflecting member, and a plurality of first lenses are disposed on the incident side of the lens member. A refracting surface and a plurality of second refracting surfaces are alternately arranged substantially coaxially, and the first refracting surface collects light in a direction toward the light receiving element by refracting part of incident light. The reflective member is disposed at a position where light that is refracted and collected by the first refracting surface does not pass, and the other part of the incident light is refracted by the second refracting surface. Thus, the light is guided to the reflecting member, and is reflected by the reflecting member to collect light in a direction toward the light receiving element.

  The light-receiving module according to a twenty-third aspect of the present invention is an invention dependent on the twenty-second aspect, wherein the lens member has a reflecting portion, and another part of the incident light is converted into the second refraction. The light is refracted on the surface and guided to the reflection portion of the lens member, and the reflected light reflected by the reflection portion is reflected by the reflection member, thereby condensing the light in the direction toward the light receiving element.

  According to the light receiving module of the twenty-second and twenty-third aspects of the present invention, the aperture of the lens can be obtained without affecting the light collection efficiency of the light that is refracted by the plurality of first refracting surfaces and collected on the light receiving element. It is possible to obtain a light receiving module with improved light collection efficiency while suppressing the enlargement of.

  A light receiving module according to a twenty-fourth aspect of the present invention is an invention dependent on the twenty-third aspect, wherein the reflecting portion is composed of a plurality of reflecting surfaces corresponding to the plurality of second refracting surfaces, respectively. The refracted light from the plurality of second refracting surfaces is reflected by the corresponding reflecting surfaces, and the reflected light is reflected by the reflecting member to be directed to the light receiving element.

  According to the light receiving module of the twenty-fourth aspect of the present invention, it is possible to obtain a light receiving module with improved light collection efficiency while suppressing the thickness of the lens and suppressing the enlargement of the lens diameter.

  A light receiving module according to a twenty-fifth aspect of the present invention is an invention dependent on the twenty-second aspect, wherein the lens member has a third refracting portion, and the other part of the incident light is The light is refracted by the second refracting surface and guided to the third refracting portion of the lens member, and the refracted light refracted by the third refracting portion is reflected by the reflecting member to collect light in the direction toward the light receiving element. It is configured to shine.

  According to the light receiving module of the twenty-fifth aspect of the present invention, the diameter of the lens can be increased without affecting the light collection efficiency of the light that is refracted by the plurality of first refracting surfaces and collected on the light receiving element. It is possible to obtain a light receiving module with improved light collection efficiency while suppressing it.

  A light receiving module according to a twenty-sixth aspect of the present invention is an invention dependent on the twenty-fifth aspect, wherein the third refracting portion is a plurality of third refracting surfaces corresponding to the plurality of second refracting surfaces, respectively. The refracted light from the plurality of second refracting surfaces is refracted by the corresponding plurality of third refracting surfaces.

  According to the light receiving module of the twenty-sixth aspect of the present invention, it is possible to obtain a light receiving module that increases the light collection efficiency while suppressing the thickness of the lens and suppressing the enlargement of the diameter of the lens.

  A light receiving module according to a twenty-seventh aspect of the present invention includes a light receiving element and a lens member, and a plurality of first refracting surfaces and a plurality of second refracting surfaces are disposed on the incident side of the lens member, The first refracting surface condenses light in a direction toward the light receiving element by refracting a part of incident light, and the lens member further includes a reflection part or a refracting part. A part of the light is refracted by the second refracting surface to be guided to the reflecting part or the refracting part, and is reflected or refracted by the reflecting part or the refracting part to collect light in a direction toward the light receiving element. It is configured to do.

  According to the light receiving module of the twenty-seventh aspect of the present invention, it is possible to obtain a light receiving module with improved light collection efficiency while suppressing an increase in lens aperture.

  A light receiving module according to a twenty-eighth aspect of the present invention includes a light receiving element, a lens member, and a reflecting member or a refractive member. A plurality of first refractive surfaces and a plurality of second members are provided on the incident side of the lens member. The first refracting surface condenses light in a direction toward the light receiving element by refracting a part of the incident light, and the other part of the incident light is The light is refracted on the second refracting surface to be guided to the reflecting member or the refracting member, and is reflected or refracted by the reflecting member or the refracting member to collect light in a direction toward the light receiving element.

  According to the light receiving module of the twenty-eighth aspect of the present invention, it is possible to obtain a light receiving module with improved light collection efficiency while suppressing an increase in lens aperture.

  The light-receiving module according to a twenty-ninth aspect of the present invention is an invention dependent on any one of the sixteenth to twenty-eighth aspects, wherein the plurality of second refracting surfaces are arranged so that the incident light is the first refracted light. It is configured to be formed at an angle substantially along the ray of refracted light refracted on the surface.

  According to the light receiving module of the twenty-ninth aspect, the second refracting surface is formed without affecting the light condensing efficiency of the light refracted by the plurality of first refracting surfaces and condensed on the light receiving element. It is possible to obtain a light receiving module that can be formed and has improved light collection efficiency while suppressing an increase in the diameter of the lens.

  According to the light emitting module of the present invention, it is possible to reduce the thickness unevenness of the emitted light, and to improve the efficiency by expanding the acceptance angle of the emitted light from the light source while suppressing the increase in the aperture of the lens. The light emitting module made possible can be realized. In addition, according to the light receiving module of the present invention, it is possible to realize a light receiving module with high light collection efficiency while suppressing an increase in the aperture of the lens by effectively guiding incident light in the non-light collecting region to the light receiving element. .

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
1 and 2 are a plan view and a side sectional view of the light emitting module according to Embodiment 1 of the present invention. FIG. 3 is a side sectional view of a main part of the light emitting module according to Embodiment 1 of the present invention.

  1 to 3, the light emitting module 100 includes a light source 110 and a lens member 120 as main components. For example, an LED or a semiconductor laser is used as the light source 110. The light source 110 is housed in a package 111 as the case may be, and the relative position of the package 111 and the lens member 120 is fixed by a housing 130. The light source 110 is supplied with an electrical modulation signal from a terminal 112, and emits an optical signal whose emission intensity or the like changes corresponding to the modulation signal with a spread in the direction of the optical axis 113. For example, when an LED is used for the light source 110, the emitted light from the light source 110 has a spread close to a Lambertian distribution in which the radiation intensity is proportional to cos θ, where θ is the emission angle from the optical axis 113 of the light source 110. It becomes. The lens member 120 is used to convert the spread angle of light from the light source into an appropriate spread angle. The emitted optical signal is received by an optical space receiver (not shown) installed oppositely, thereby realizing optical space transmission of information data. If the spread of the emitted light from the light emitting module 100 is too large, the radiated power density is reduced and the transmission distance of the optical space transmission system is shortened. Therefore, the lens member 120 mainly reduces the spread angle of the emitted light of the light source. It is designed to emit light after converting to a divergence angle. Therefore, a plurality of first refracting surfaces 121 are provided on the exit side of the lens member 120, and light having an exit angle from the light source 110 within θ0 shown in FIG. The light is emitted in the direction. FIG. 3 shows a case where light is converted into light parallel to the optical axis 113 as a simple example. That is, the plurality of first refractive surfaces 121 act as a general Fresnel lens. The above is the same as the conventional light emitting module shown in FIGS.

  Next, differences between the light emitting module 100 according to Embodiment 1 of the present invention and the conventional light emitting module will be described. A Fresnel lens is generally configured by connecting a plurality of refractive surfaces with a surface substantially parallel to the optical axis. The broken line in FIG. 3 shows the shape of this general Fresnel lens. However, as already described with reference to FIG. 31, this general Fresnel lens has an ineffective portion of the lens through which light does not pass. This is the shaded area in FIG. In the lens member 120, the ineffective portion is removed to form a plurality of second refractive surfaces 122. The plurality of second refracting surfaces 122 are alternately formed on the same axis as the plurality of first refracting surfaces 121. The plurality of second refracting surfaces 122 are desirably formed by removing only the ineffective portion of the lens along the light beam 114 in which light having an emission angle from the light source 110 within θ0 travels through the lens member 120. Therefore, it is desirable that the light source 110 be composed of a surface along the light beam that reaches the lowest end of the plurality of first refractive surfaces. Thus, the formation of the plurality of second refracting surfaces 122 does not cause light loss when light from the light source 110 having an emission angle within θ0 is emitted from the lens member 120. A plurality of reflection surfaces 123 using total reflection are formed on the incident side of the lens member 120. Since the plurality of reflecting surfaces 123 are provided outside the light passing range where the emission angle from the light source 110 is within θ0, the light having the emission angle from the light source 110 within θ0 is also emitted from the lens member 120. There will be no loss of light. The plurality of reflecting surfaces 123 correspond to the plurality of second refracting surfaces 122, respectively, and reflect light having an emission angle of θ0 to θ1 from the light source 110 toward the corresponding plurality of refracting surfaces 122. On the second refracting surface 122, the reflected light is refracted and emitted from the lens member 120. At this time, the angles of the plurality of reflecting surfaces 123 are set so that the light emitted from the lens member 120 has a desired angle (in FIG. 3, it is parallel to the optical axis).

  With the configuration described above, light with an emission angle of θ0 to θ1 from the light source 110 is emitted from the portion corresponding to the dark portion shown in FIG. 31, and thus brightness unevenness of the emitted light can be improved. . Further, from the range of the diameter do in FIG. 3 in which the plurality of first refracting surfaces 121 are formed, not only light having an emission angle from the light source 110 within θ0 but also light having an emission angle from the light source 110 of θ0 to θ1. As a result, the radiation power density within the range of the diameter do is increased, and an efficient light emitting module 100 is obtained. In addition, if the maximum range (diameter di) of the plurality of reflecting surfaces 123 is set within the maximum range (diameter do) of the plurality of first refracting surfaces 121, the lens member can be used from the case of only the plurality of first refracting surfaces 121. Without increasing the diameter of 120, the radiation intensity from the light emitting module 100 can be increased and the efficiency can be improved. More specifically, in the configuration of the light emitting module of the conventional lighting device shown in FIG. 30, since the light reflected by the reflecting surface 15 is emitted from the outside of the range d1 of the refracting surface 13, the aperture of the lens 12 is always set. I had to make it bigger. On the other hand, in the first embodiment, the reflected light from the plurality of reflecting surfaces 123 is emitted from the plurality of second refracting surfaces 122 formed within the range of the plurality of first refracting surfaces 121. Since it is a structure, efficiency can be improved, without making it larger than the aperture of the some 1st refractive surface 121. FIG.

  As described above, according to the configuration of the present embodiment, a plurality of second refracting surfaces 122 are alternately arranged with a plurality of first refracting surfaces 121 on the exit side of the lens member 120, and a plurality of them are provided on the incident side. The reflected light from the reflecting surface 123 is refracted at a desired angle by the plurality of second refracting surfaces 122 and emitted, thereby improving unevenness in the brightness of the emitted light and increasing the aperture of the lens member 120. Thus, it is possible to obtain an excellent light-emitting module 100 with increased radiation intensity and improved efficiency.

  1 and 2, the light source 110 is housed in the package 111, and the package 111 and the lens member 120 are fixed by the housing 130. The present embodiment is characterized by a lens. The fixing structure between the light source 110 and the lens member 120 in the member 120 is a design matter, and it goes without saying that the same effect can be obtained with other configurations.

  In the present embodiment, the maximum range (diameter di) of the plurality of reflecting surfaces 123 is set to be within the maximum range (diameter do) of the plurality of first refractive surfaces 121, and the aperture of the lens member 120 is not enlarged. However, even if the maximum range (diameter di2) of the plurality of reflecting surfaces 223 is made larger than the maximum range (diameter do) of the plurality of first refracting surfaces 121 as shown in FIG. In addition, the radiation intensity can be increased and the efficiency can be improved, and the brightness unevenness of the emitted light can be improved.

  In the present embodiment, the light incident surface 124 of the lens member 120 having an emission angle from the light source 110 within θ0 is a flat surface. However, even in the case of a curved surface like the incident surface 324 of the lens member 320 in FIG. 5, a plurality of second refracting surfaces 322 are provided alternately with the plurality of first refracting surfaces 321, and reflection from the plurality of reflecting surfaces 323 is performed. A similar effect can be obtained by refracting and emitting light at the plurality of second refracting surfaces 322. Alternatively, the lens member 120 may be provided with a Fresnel lens surface on the light incident surface having an emission angle from the light source 110 within θ0.

  In the present embodiment, a plurality of reflecting surfaces 123 are provided. However, a single reflecting surface 423 may be provided instead of the plurality of reflecting surfaces 123 as in the lens member 420 shown in FIG. . In this case, although it is difficult to make all the angles of the light emitted from the plurality of second refracting surfaces 122 optimal, it is possible to obtain an almost desired value by appropriately designing the angle of the single reflecting surface 423. The same effect that the angle of the emitted light can be obtained, the brightness unevenness of the emitted light can be improved, the radiation intensity can be increased, and the efficiency can be improved.

  Further, instead of the lens member 420 illustrated in FIG. 6, the light source 110 may be sealed with the lens member 520 as in the lens member 520 illustrated in FIG. 7. Also in this case, by providing a plurality of second refracting surfaces 522 alternately with the plurality of first refracting surfaces 521, the reflected light from the reflecting surface 523 is refracted by the plurality of second refracting surfaces 522 and emitted. In addition to improving the brightness unevenness of the emitted light, it is possible to obtain the same effect that the radiation intensity can be increased and the efficiency can be improved.

(Embodiment 2)
8 and 9 are a plan view and a side sectional view of the light emitting module according to Embodiment 2 of the present invention. FIG. 10 is a side sectional view of a main part of the light emitting module according to Embodiment 2 of the present invention, and FIG. 11 is an enlarged view of a portion B in FIG. 8 to 11, the same components as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted.

  8 to 11, the light emitting module 600 includes a light source 110 and a lens member 620 as main components. The light source 110 is, for example, an LED or the like, bonded to the cathode electrode 612a, and electrically connected to the anode electrode 612b and the wire 612c. The lens member 620, the cathode electrode 612a, and the anode electrode 612b are fixed by a housing 630 made of resin or the like. A reflective member 641 is installed on the cathode electrode 612a. The reflecting member 641 has an inverted conical inner light reflecting surface, for example, and may be fixed to the cathode electrode 612a or may be integrally formed with the cathode electrode 612a by the material of the cathode electrode 612a. is there.

  Similar to the lens member 120 in FIG. 3, a plurality of first refracting surfaces 121 are provided on the exit side of the lens member 620, and light having an exit angle from the light source 110 within θ0 is refracted to a desired angle. It emits in the direction of. Further, the plurality of second refracting surfaces 122 are formed in a form in which an ineffective portion in a general Fresnel lens is removed, similarly to the lens member 120 in FIG. The second embodiment is different from the first embodiment shown in FIG. 3 in that light emitted from the side surface of the light source 110 is reflected by the reflecting member 641, and then a plurality of light beams provided on the incident side of the lens member 620 are provided. That is, the light is reflected by the reflecting surface 623, and the light is emitted from the lens member 620 at a desired angle by the plurality of second refracting surfaces 122. That is, in the first embodiment shown in FIG. 3, the light having the emission angles of θ0 to θ1 in FIG. 3 is used. On the other hand, in the second embodiment, the light emitted from the side surface of the light source is used. It is configured to use. In particular, when an LED is used for the light source 110, the power of the emitted light from the LED side surface is large, and the efficiency of the light emitting module 600 can be increased by using the power of the emitted light from the side surface. The plurality of reflecting surfaces 623 are provided corresponding to the plurality of second refracting surfaces 122, and the plurality of reflecting surfaces 623 are arranged so that the light refracted by the plurality of refracting surfaces 122 is emitted at a desired angle. An angle is set. As a result, not only light with an emission angle of θ0 within θ0 but also light from the side surface of the light source 110 is emitted from the range of the diameter do in FIG. 10 where the plurality of first refractive surfaces 121 are formed. As a result, an efficient light emitting module 600 is obtained. In addition, since the light from the side surface of the light source 110 is emitted from the portion corresponding to the dark portion shown in FIG. 31, it is obvious that the brightness unevenness of the emitted light can be improved as in the first embodiment. it can.

  As described above, according to the configuration of the second embodiment, the plurality of second refracting surfaces 122 are alternately arranged with the plurality of first refracting surfaces 121 on the exit side of the lens member 620, and a plurality of on the incident side. By providing the reflecting surface 623 and providing the reflecting member 641 around the light source 110, the light from the side surface of the light source 110 is refracted and emitted at a desired angle by the plurality of second refracting surfaces 122. Brightness unevenness can be improved, and an excellent light emitting module 600 with improved radiation intensity and improved efficiency can be obtained without increasing the diameter of the lens member 620 so much.

  In the second embodiment, the reflected light from the reflecting member 641 is guided to the plurality of second refracting surfaces 122 by the plurality of reflecting surfaces 623 provided on the incident side of the lens member 620. Since the light emitted from the light source 110 is used for deflecting in the direction of the plurality of reflecting surfaces 623, instead of the reflecting member 641, for example, like a prism, it is deflected by using a refraction function. An optical deflection element may be used.

  In the second embodiment, the reflected light from the reflecting member 641 is guided to the plurality of second refracting surfaces 122 by the plurality of reflecting surfaces 623 provided on the incident side of the lens member 620, as shown in FIG. In addition, even when the reflected light from the reflecting member 741 is guided to the plurality of second refracting surfaces 122 by the plurality of third refracting surfaces 725 provided on the incident side of the lens member 720, the light is effectively transmitted from the side surface of the light source 110. It is possible to increase the radiation intensity, improve the efficiency, and improve the brightness unevenness of the emitted light.

  Further, as shown in FIG. 13, the reflected light from the reflecting member 841 enters from the incident surface 826 on the incident side of the lens member 820, is refracted by the plurality of second refracting surfaces 822, and is emitted from the lens member 820. Also good. In this case, it is difficult to set all the angles of the emitted light from the plurality of second refracting surfaces 122 to an optimum angle. However, by appropriately designing the angle of the reflecting member 841, almost the desired emitted light can be obtained. The same effect can be obtained that the angle can be obtained, the brightness unevenness of the emitted light can be improved, the radiation intensity can be increased, and the efficiency can be improved.

  Further, instead of the lens member 820 illustrated in FIG. 13, the light source 110 and the reflection member 941 may be sealed with the lens member 920 as in the lens member 920 illustrated in FIG. 14. Also in this case, by providing a plurality of second refracting surfaces 922 alternately with the plurality of first refracting surfaces 921, the reflected light from the reflecting member 941 is refracted by the plurality of second refracting surfaces 922 and emitted. The same effect is obtained that light can be effectively used from the side of the light source 110 to improve unevenness of the brightness of the emitted light, and increase the radiation intensity and improve the efficiency.

  In the second embodiment, the efficiency of the light emitting module 600 is improved by using the light from the side surface of the light source 110 reflected by the reflecting member 641. However, as shown in FIG. The light having an emission angle from the upper surface of θ0 or more is reflected by the reflecting member 1041, is incident from the incident surface 1026 of the lens member 1020, and is refracted by the plurality of second refracting surfaces 122 to be used. It is good also as a structure which improves efficiency while improving unevenness.

(Embodiment 3)
16 and 17 are a plan view and a side sectional view of the light receiving module according to Embodiment 3 of the present invention. FIG. 18 is a side sectional view of an essential part of the light receiving module according to Embodiment 3 of the present invention.

  16 to 18, the light receiving module 2100 includes a light receiving element 2110 and a lens member 2120 as main components. As the light receiving element 2110, for example, a photodiode (PD) or the like is used. The light receiving element 2110 is housed in a package 2111 as the case may be, and the relative position of the package 2111 and the lens member 2120 is fixed by a housing 2130. The light receiving module 2100 receives, for example, an optical signal emitted from the light emitting module 100 according to Embodiment 1 from a direction close to the direction of the optical axis 2113 from an optical space transmitter (not shown) provided oppositely. The light is condensed on the light receiving element 2110 by the lens member 2120. The light receiving element 2110 converts the received optical signal into an electrical signal and outputs the electrical signal from the terminal 2112. Thereby, optical space transmission of information data is realized. If the light collection efficiency of incident light to the light receiving module 2100 is poor, the received light power is reduced and the transmission distance of the optical space transmission system is shortened. Therefore, it is necessary to design the lens member 2120 so as to obtain high light collection efficiency. There is. Therefore, a plurality of first refracting surfaces 2121 are provided on the incident side of the lens member 2120, and incident light is condensed on the light receiving element 2110 by being refracted by the plurality of first refracting surfaces 2121. . FIG. 18 shows a case where incident light parallel to the optical axis 2113 is collected as a simple example. That is, the plurality of first refractive surfaces 2121 act as a general Fresnel lens. The above is the same as the conventional light receiving module shown in FIG. 32 and FIG.

  Next, differences between the light receiving module 2100 according to Embodiment 3 of the present invention and the conventional light receiving module will be described. A Fresnel lens is generally configured by connecting a plurality of refractive surfaces with a surface substantially parallel to the optical axis. The broken line in FIG. 18 shows the shape of this general Fresnel lens. However, as already described with reference to FIG. 33, this general Fresnel lens has an ineffective portion (non-condensing region) of the lens that cannot collect incident light. This is the shaded area in FIG. In the lens member 2120, the ineffective portion is removed, and thereby a plurality of second refracting surfaces 2122 are formed. The plurality of second refractive surfaces 2122 are alternately formed coaxially with the plurality of first refractive surfaces 2121. The plurality of second refracting surfaces 2122 are formed by removing only the ineffective portion of the lens along the light beam 2114 of refracted light in which incident light parallel to the optical axis 2113 is refracted by the first refracting surface 2121. It is desirable. Therefore, it is desirable that the incident light parallel to the optical axis 2113 is refracted by the first refracting surface 2121 and is constituted by a surface along the light beam reaching the lowest end of the plurality of first refracting surfaces 2121. Thus, the formation of the plurality of second refracting surfaces 2122 causes a loss of light when condensing incident light parallel to the optical axis 2113 onto the light receiving element 2110 by the plurality of first refracting surfaces 2121. There will be no. Furthermore, a plurality of reflecting surfaces 2123 using total reflection are formed on the exit side of the lens member 2120. Since the plurality of reflecting surfaces 2123 are provided outside the range of light that is refracted by the plurality of first refracting surfaces 2121 and collected on the light receiving element 2110, incident light parallel to the optical axis 2113 is also transmitted to the plurality of first reflecting surfaces 2123. When the light is condensed on the light receiving element 2110 by the one refracting surface 2121, no light loss is given. The plurality of reflecting surfaces 2123 correspond to the plurality of second refracting surfaces 2122, respectively, and reflect incident light refracted by the plurality of second refracting surfaces 2122 in the direction toward the light receiving element 2110. Collect light. At this time, the angles of the plurality of reflecting surfaces 2123 are set so that the light emitted from the lens member 2120 is directed to the light receiving element 2110.

  By configuring as described above, incident light from the non-condensing region shown in FIG. 33 can be condensed on the light receiving element 2110 by the plurality of second refracting surfaces 2122 and the plurality of reflecting surfaces 2123. A light receiving module 2100 with high light collection efficiency is obtained. In addition, if the maximum range (diameter di) of the plurality of reflecting surfaces 2123 is set to be within the maximum range (diameter do) of the plurality of first refracting surfaces 2121, the lens member starts from the case of only the plurality of first refracting surfaces 2121. The light collection efficiency of the light receiving module 2100 can be improved without increasing the aperture of the 2120. More specifically, considering a configuration in which the light rays of the configuration of the light emitting module of the conventional lighting device shown in FIG. 30 are traced, a configuration for condensing incident light outside the diameter d1 is also conceivable. In order to condense light incident from the range d1 of the refracting surface 13, the aperture of the lens 12 must be increased. On the other hand, in the third embodiment, the refracted light incident from the plurality of second refracting surfaces 2122 formed within the range of the plurality of first refracting surfaces 2121 is reflected by the plurality of reflecting surfaces 2123. Therefore, the efficiency can be improved without increasing the diameter of the plurality of first refractive surfaces 2121 (do in FIG. 18).

  As described above, according to the configuration of the third embodiment, the plurality of second refracting surfaces 2122 are alternately arranged with the plurality of first refracting surfaces 2121 on the incident side of the lens member 2120, and the plurality of second refracting surfaces 2122 are disposed on the exit side. A reflection surface 2123 is provided, incident light on the plurality of second refracting surfaces 2122 is refracted toward the plurality of reflection surfaces 2123, reflected by the plurality of reflection surfaces 2123 toward the light receiving element 2110, and then emitted. Incident light from the non-condensing region of the lens can also be condensed on the light receiving element 2110, and an excellent light receiving module 2100 with high condensing efficiency can be obtained without increasing the aperture of the lens member 2120.

  In the third embodiment shown in FIGS. 16 and 17, the light receiving element 2110 is housed in the package 2111, and the package 2111 and the lens member 2120 are fixed by the housing 2130. The features of the present embodiment are as follows. Is in the lens member 2120, and the fixing structure between the light receiving element 2110 and the lens member 2120 is a design matter, and it goes without saying that the same effect can be obtained with other configurations.

  In the third embodiment, the maximum range (diameter di) of the plurality of reflecting surfaces 2123 is set within the maximum range (diameter do) of the plurality of first refracting surfaces 2121 and the aperture of the lens member 2120 is not enlarged. However, even if the maximum range (diameter di2) of the plurality of reflecting surfaces 2223 is larger than the maximum range (diameter do) of the plurality of first refractive surfaces 2121 as shown in FIG. The effect that the light collection efficiency can be increased is obtained.

  In the third embodiment, the emission surface other than the region of the plurality of reflection surfaces 2123 of the lens member 2120 is a flat surface. However, even in the case of a curved surface such as the exit surface 2324 of the lens member 2320 in FIG. 20, a plurality of second refracting surfaces 2322 are provided alternately with a plurality of first refracting surfaces 2321, and a plurality of second refracting surfaces 2322 are provided. The same effect can be obtained by reflecting the incident light refracted in step S2 by a plurality of reflecting surfaces 2323 and emitting it in the direction of the light receiving element 2110. Or you may provide a Fresnel lens surface in the curved surface part of the output surface 2324 in the lens member 2320 of FIG.

  In the third embodiment, the plurality of reflection surfaces 2123 are provided. However, a single reflection surface 2423 may be provided instead of the plurality of reflection surfaces 2123 as in the lens member 2420 shown in FIG. Absent.

  Further, instead of the lens member 2420 shown in FIG. 21, the light receiving element 2110 may be sealed with the lens member 2520 as in the lens member 2520 shown in FIG. Also in this case, the same effect that the light collection efficiency can be improved by reflecting the incident light refracted by the plurality of second refracting surfaces 2322 by the reflecting surface 2523 and condensing it in the direction of the light receiving element 2110 is obtained. .

(Embodiment 4)
23 and 24 are a plan view and a side cross-sectional view of light receiving module 2600 according to Embodiment 4 of the present invention. FIG. 25 is a side sectional view of a main part of the light receiving module according to Embodiment 4 of the present invention. 23 to 25, the same components as those in FIGS. 16 to 18 are denoted by the same reference numerals, and description thereof is omitted.

  23 to 25, the light receiving module 2600 includes a light receiving element 2110 and a lens member 2620 as main components. The light receiving element 2110 is, for example, a photodiode (PD) or the like, bonded to the anode electrode 2612a, and electrically connected to the cathode electrode 2612b via a wire 2612c. The lens member 2620, the anode electrode 2612a, and the cathode electrode 2612b are fixed by a housing 2630 made of a resin or the like. A reflective member 2641 is provided on the anode electrode 2612a. The reflection member 2641 has an inverted conical inner surface, for example, and may be fixed on the anode electrode 2612a, or may be integrally formed with the anode electrode 2612a using the material of the anode electrode 2612a.

  Like the lens member 2120 in FIG. 18, a plurality of first refracting surfaces 2121 are provided on the incident surface side of the lens member 2620, and the light receiving element is refracted by the plurality of first refracting surfaces 2121. 2110 is focused. Further, the incident surface of the lens member 2620 has a plurality of second refracting surfaces 2122 formed by removing an ineffective portion in a general Fresnel lens, similarly to the lens member 2120 in FIG. The fourth embodiment is different from the third embodiment shown in FIG. 18 in that light refracted by a plurality of second refracting surfaces 2122, reflected by a plurality of reflecting surfaces 2623, and emitted from a lens member 2620. In other words, the light is reflected by a reflecting member 2641 provided separately from the lens member 2620 and condensed on the light receiving element 2110. The plurality of reflection surfaces 2623 are provided corresponding to the plurality of second refracting surfaces 2122 so that light reflected by the plurality of reflection surfaces 2623 is emitted at an angle toward the desired light receiving element 2110. The angles of the plurality of reflecting surfaces 2623 are set. Accordingly, incident light from the non-condensing region shown in FIG. 33 can be condensed on the light receiving element 2110 by the plurality of second refracting surfaces 2122, the plurality of reflecting surfaces 2623, and the reflecting member 2641. A highly efficient light receiving module 2600 is obtained.

  As described above, according to the configuration of the fourth embodiment, the plurality of second refracting surfaces 2122 are alternately arranged with the plurality of first refracting surfaces 2121 on the incident side of the lens member 2620, and the plurality of second refracting surfaces 2121 are disposed on the exit side. By providing the reflecting surface 2623 and providing the reflecting member 2641 around the light receiving element 2110, the incident light from the non-condensing region of the Fresnel lens can be condensed on the light receiving element 2110, and the aperture of the lens member 2620 is almost enlarged. Therefore, an excellent light receiving module 2600 having a high light collection efficiency can be obtained.

  In the fourth embodiment, the reflected light from the plurality of reflecting surfaces 2623 provided on the incident side of the lens member 2620 is condensed on the light receiving element 2110 by the reflecting member 2641. However, the reflecting member 2641 has a plurality of reflecting surfaces. Since the reflected light from the surface 2623 is used to deflect the light in the direction of the light receiving element 2110, instead of the reflecting member 2641, for example, it is deflected by using a refracting action like a prism. A simple deflection element may be used.

  Further, in the fourth embodiment, the refracted light from the plurality of second refracting surfaces 2122 is guided to the reflecting member 2641 by the plurality of reflecting surfaces 2623 provided on the exit side of the lens member 2620. As shown in FIG. In addition, the configuration in which the refracted light from the plurality of second refracting surfaces 2122 is guided to the reflecting member 2741 by the plurality of third refracting surfaces 2725 provided on the exit side of the lens member 2720 can also be used from the non-condensing region of the Fresnel lens. Incident light can be condensed on the light receiving element 2110, and an excellent light receiving module with high condensing efficiency can be obtained.

  In addition, as shown in FIG. 27, the refracted light from the plurality of second refracting surfaces 2822 is emitted from the emitting surface 2826 on the emitting side of the lens member 2820, reflected by the reflecting member 2841, and condensed on the light receiving element 2110. However, the same effect can be obtained.

  In addition, instead of the lens member 2820 shown in FIG. 27, the light receiving element 2110 and the reflection member 2941 may be sealed with the lens member 2920 as in the lens member 2920 shown in FIG. Also in this case, a plurality of second refracting surfaces 2922 are provided alternately with the plurality of first refracting surfaces 2921, and the refracted light from the plurality of second refracting surfaces 2922 is reflected by the reflecting member 2941 to be received by the light receiving element 2110. By collecting light, an excellent light receiving module with high light collection efficiency can be obtained.

  In all of the embodiments, the application to the optical space transmission system has been described. However, the light emitting modules of Embodiments 1 and 2 are thin, can reduce unevenness in brightness, have high radiated power density, and high efficiency. Since the light receiving modules of Embodiments 3 and 4 have high light collection efficiency, they can be used for other applications such as optical sensor applications using light propagating in free space or illumination applications. It is effective even when applied.

  The light-emitting module according to the present invention can be thinned and can increase efficiency by widening the acceptance angle of the outgoing light from the light source while suppressing the increase in the aperture of the lens, and can also reduce the unevenness of the brightness of the outgoing light It is useful as an application to an optical space transmission system or the like that transmits information using an optical signal through free space. Further, it can be applied to an optical sensor using light propagating in space, or illumination.

  In addition, the light receiving module according to the present invention can be thinned and suppresses the enlargement of the aperture of the lens, and effectively guides the incident light of the non-condensing region incident on the invalid portion of the Fresnel lens to the light receiving element. It has the effect of increasing the light efficiency, and is useful as an application to an optical space transmission system or the like that transmits information using an optical signal through free space. Further, it can be applied to an optical sensor using light propagating in space, or illumination.

The top view of the light emitting module in Embodiment 1 of this invention Side surface sectional drawing of the light emitting module in Embodiment 1 of this invention Side surface sectional drawing of the principal part of the light emitting module in Embodiment 1 of this invention Side surface sectional drawing of the principal part of the modification 1 of the light emitting module in Embodiment 1 of this invention Side surface sectional drawing of the principal part of the modification 2 of the light emitting module in Embodiment 1 of this invention Side surface sectional drawing of the principal part of the modification 3 of the light emitting module according to Embodiment 1 of the present invention. Side surface sectional drawing of the principal part of the modification 4 of the light emitting module in Embodiment 1 of this invention The top view of the light emitting module in Embodiment 2 of this invention Side surface sectional drawing of the light emitting module in Embodiment 2 of this invention Side surface sectional drawing of the principal part of the light emitting module in Embodiment 2 of this invention The principal part side surface expanded sectional view of the light emitting module in Embodiment 2 of this invention. Side surface sectional drawing of the principal part of the modification 1 of the light emitting module in Embodiment 2 of this invention Side surface sectional drawing of the principal part of the modification 2 of the light emitting module in Embodiment 2 of this invention Side surface sectional drawing of the principal part of the modification 3 of the light emitting module in Embodiment 2 of this invention Side surface sectional drawing of the principal part of the modification 4 of the light emitting module in Embodiment 2 of this invention Plan view of a light receiving module according to Embodiment 3 of the present invention Side surface sectional drawing of the light reception module in Embodiment 3 of this invention Side surface sectional drawing of the principal part of the light reception module in Embodiment 3 of this invention Side surface sectional drawing of the principal part of the modification 1 of the light reception module in Embodiment 3 of this invention Side surface sectional drawing of the principal part of the modification 2 of the light receiving module in Embodiment 3 of the present invention Side surface sectional drawing of the principal part of the modification 3 of the light receiving module in Embodiment 3 of the present invention Side surface sectional drawing of the principal part of the modification 4 of the light receiving module in Embodiment 3 of the present invention Plan view of light receiving module according to Embodiment 4 of the present invention Side surface sectional drawing of the light reception module in Embodiment 4 of this invention Side surface sectional drawing of the principal part of the light reception module in Embodiment 4 of this invention Side surface sectional drawing of the principal part of the modification 1 of the light reception module in Embodiment 4 of this invention Side surface sectional drawing of the principal part of the modification 2 of the light receiving module in Embodiment 4 of the present invention Side surface sectional drawing of the principal part of the modification 3 of the light receiving module in Embodiment 4 of the present invention Side sectional view of a conventional light emitting module Side sectional view of another conventional light emitting module Side sectional enlarged view of a conventional light emitting module Side view of a conventional light receiving module Side cross-sectional enlarged view of a conventional light receiving module

Explanation of symbols

100 light emitting module 110 light source 120 lens member 121 first refracting surface 122 second refracting surface 123 reflecting surface 124 incident surface 223 reflecting surface 320 lens member 321 first refracting surface 322 second refracting surface 323 reflecting surface 324 incident surface 423 reflective surface 521 first refractive surface 522 second refractive surface 523 reflective surface 600 light emitting module 620 lens member 623 reflective surface 641 reflective member 720 lens member 741 reflective member 725 third refractive surface 820 lens member 841 reflective member 826 incident Surface 920 lens member 921 first refracting surface 922 second refracting surface 941 reflecting member 1020 lens member 1041 reflecting member 2100 light receiving module 2110 light receiving element 2120 lens member 2121 first refracting surface 2122 second refracting surface 2123 reflecting surface 2124 Output surface 2223 Emitting surface 2320 Lens member 2321 First refracting surface 2322 Second refracting surface 2323 Reflecting surface 2324 Outgoing surface 2423 Reflecting surface 2521 First refracting surface 2522 Second refracting surface 2523 Reflecting surface 2600 Light receiving module 2620 Lens member 2623 Reflecting surface 2641 Reflective member 2720 Lens member 2741 Reflective member 2725 Third refractive surface 2820 Lens member 2841 Reflective member 2826 Outgoing surface 2920 Lens member 2921 First refractive surface 2922 Second refractive surface 2941 Reflective member

Claims (29)

A light emitting module comprising a light source and a lens member that changes light from the light source to a predetermined directivity characteristic,
On the exit side of the lens member,
The plurality of first refracting surfaces and the plurality of second refracting surfaces are alternately arranged substantially coaxially,
The first refracting surface emits at a predetermined angle by refracting a part of the emitted light from the light source, and
The lens member further includes a reflection portion at a position where a part of the emitted light from the light source refracted by the first refracting surface is not transmitted,
A part of the light emitted from the light source is guided to the second refracting surface by being reflected by the reflecting portion, and is emitted at a predetermined angle by being refracted by the second refracting surface. Light emitting module.   The light emitting module according to claim 1, wherein the reflection portion is configured by a total reflection surface.   The light emitting module according to claim 1, wherein the light source is disposed in the lens member.   The lens member includes an incident surface at a position where a part of the emitted light from the light source refracted by the first refracting surface does not pass, and the light incident from the incident surface is reflected by the reflecting portion at the second refracting surface. The light emitting module according to claim 1, wherein the light emitting module emits at a predetermined angle by being guided to a surface and being refracted by the second refracting surface.   The reflecting portion is configured by a plurality of reflecting surfaces corresponding to the plurality of second refracting surfaces, and the reflected light from the plurality of reflecting surfaces is refracted by the corresponding second refracting surfaces. The light emitting module according to any one of claims 1 to 4, which emits light at a predetermined angle.   6. The installation range of the reflection part viewed from the optical axis side of the light source is set within the installation range of the first refracting surface viewed from the optical axis side of the light source. The light emitting module as described in any of the above. A light emitting module comprising: a light source; a lens member that changes light from the light source to a predetermined directivity; and a reflective member that reflects light from the light source,
On the exit side of the lens member,
The plurality of first refracting surfaces and the plurality of second refracting surfaces are alternately arranged substantially coaxially,
The first refracting surface emits at a predetermined angle by refracting a part of the emitted light from the light source, and
Arranging the reflecting member at a position where a part of the emitted light from the light source refracted by the first refracting surface does not pass;
A part of the emitted light from the light source is reflected by the reflecting member to reach the second refracting surface, and is refracted by the second refracting surface to be emitted at a predetermined angle. Light emitting module to be used.   The light emitting module according to claim 7, wherein the reflecting member reflects light emitted from a side surface of the light source.   The lens member has a reflecting portion, and the reflected light reflected by the reflecting member is reflected by the reflecting portion of the lens member and then refracted by the second refracting surface to be emitted at a predetermined angle. Or the light emitting module of Claim 8.   The reflecting portion is configured by a plurality of reflecting surfaces corresponding to the plurality of second refracting surfaces, and the reflected light from the plurality of reflecting surfaces is refracted by the corresponding second refracting surfaces. The light emitting module according to claim 9, which emits light at a predetermined angle.   The lens member has a third refracting portion, and the reflected light of the reflecting member is refracted by the third refracting portion of the lens member and then refracted by the second refracting surface to be emitted at a predetermined angle. The light emitting module according to claim 7 or 8.   The third refracting portion is configured by a plurality of third refracting surfaces corresponding to the plurality of second refracting surfaces, and a plurality of refracting lights from the plurality of third refracting surfaces are provided. The light emitting module according to claim 11, wherein the light emitting module emits light at a predetermined angle by being refracted by the two refracting surfaces. A light emitting module comprising a light source and a lens member,
A plurality of first refracting surfaces and a plurality of second refracting surfaces are arranged on the exit side of the lens member, and the first refracting surface refracts part of the emitted light from the light source. And at a predetermined angle,
The lens member further includes a reflection part or a refracting part, and guides the other part of the emitted light from the light source to the second refracting surface by reflecting or refracting the reflected light by the reflecting part or the refracting part. A light emitting module that emits light at a predetermined angle by being refracted by two refracting surfaces. A light emitting module comprising a light source, a lens member, a reflective member or a refractive member,
A plurality of first refracting surfaces and a plurality of second refracting surfaces are arranged on the exit side of the lens member, and the first refracting surface refracts part of the emitted light from the light source. And at a predetermined angle,
The other part of the emitted light from the light source is guided to the second refracting surface by being reflected or refracted by the reflecting member or the refracting member, and is refracted by the second refracting surface to a predetermined angle. Light emitting module characterized by emitting light at   The light emitting module according to any one of claims 1 to 14, wherein the plurality of second refracting surfaces are formed at an angle substantially along a ray of outgoing light that reaches the first refracting surface from the light source. . A light receiving module comprising a light receiving element and a lens member that collects light to the light receiving element;
On the incident side of the lens member,
The plurality of first refracting surfaces and the plurality of second refracting surfaces are alternately arranged substantially coaxially,
The first refracting surface condenses light in a direction toward the light receiving element by refracting a part of incident light,
The lens member further includes a reflecting portion at a position where light that is refracted and collected by the first refracting surface does not pass through.
The other part of the incident light is refracted by the second refracting surface to be guided to the reflecting portion, and is reflected by the reflecting portion to collect light in a direction toward the light receiving element. The light receiving module.   The light receiving module according to claim 16, wherein the reflection portion is configured by a total reflection surface.   The light receiving module according to claim 16 or 17, wherein the light receiving element is disposed in the lens member.   The lens member includes an exit surface at a position where light that is refracted by the first refracting surface and condensed on the light receiving element does not pass, and another part of the incident light is refracted by the second refracting surface. The light receiving module according to claim 16 or 17, wherein the light receiving module is guided to the reflecting portion, reflected by the reflecting portion, emitted from the emitting surface, and condensed in a direction toward the light receiving element.   The reflecting portion is configured by a plurality of reflecting surfaces corresponding to the plurality of second refracting surfaces, and refracted light from the plurality of second refracting surfaces is reflected by the corresponding reflecting surfaces. The light receiving module according to any one of claims 16 to 19, wherein the light is collected in a direction toward the light receiving element.   17. The installation range of the reflection part viewed from the optical axis direction of the lens member is within the installation range of the first refractive surface viewed from the optical axis direction of the lens member. Item 21. The light receiving module according to any one of Items 20 to 20. A light receiving module comprising a light receiving element, a lens member for condensing light to the light receiving element, and a reflecting member;
On the incident side of the lens member,
The plurality of first refracting surfaces and the plurality of second refracting surfaces are alternately arranged substantially coaxially,
The first refracting surface condenses light in a direction toward the light receiving element by refracting a part of incident light,
Disposing the reflecting member at a position where light that is refracted and collected by the first refracting surface does not pass;
The other part of the incident light is refracted by the second refracting surface to be guided to the reflecting member, and is reflected by the reflecting member to collect light in a direction toward the light receiving element. The light receiving module.   The lens member has a reflection part, and another part of the incident light is refracted by the second refracting surface and led to the reflection part of the lens member, and the reflected light reflected by the reflection part is reflected by the reflection part. The light receiving module according to claim 22, wherein the light is collected in a direction toward the light receiving element by being reflected by a member.   The reflecting portion is configured by a plurality of reflecting surfaces corresponding to the plurality of second refracting surfaces, and refracted light from the plurality of second refracting surfaces is reflected by the corresponding reflecting surfaces. The light receiving module according to claim 23, wherein the light is collected in a direction toward the light receiving element by reflecting the reflected light by the reflecting member.   The lens member has a third refracting portion, and another part of the incident light is refracted by the second refracting surface to be guided to the third refracting portion of the lens member, and the third refracting portion. The light receiving module according to claim 22, wherein the light is condensed in a direction toward the light receiving element by reflecting the refracted light refracted by the part with the reflecting member.   The third refracting portion is configured by a plurality of third refracting surfaces corresponding to the plurality of second refracting surfaces, and a plurality of second refracting surfaces corresponding to the refracted light from the plurality of second refracting surfaces. 26. The light receiving module according to claim 25, wherein the light receiving module is refracted by three refractive surfaces. A light receiving module comprising a light receiving element and a lens member,
A plurality of first refracting surfaces and a plurality of second refracting surfaces are arranged on the incident side of the lens member, and the first refracting surface refracts part of incident light to refract the light receiving element. Condensing light in the direction toward
The lens member further includes a reflection part or a refraction part, and guides the other part of the incident light to the reflection part or the refraction part by being refracted by the second refraction surface. A light receiving module that collects light in a direction toward the light receiving element by being reflected or refracted by the light. A light receiving module comprising a light receiving element, a lens member, a reflecting member or a refractive member,
A plurality of first refracting surfaces and a plurality of second refracting surfaces are arranged on the incident side of the lens member, and the first refracting surface refracts part of incident light to refract the light receiving element. Condensing light in the direction toward
The other part of the incident light is refracted by the second refracting surface to be guided to the reflecting member or the refracting member, and is reflected or refracted by the reflecting member or the refracting member to be directed to the light receiving element. Light receiving module characterized by focusing light on   29. The plurality of second refracting surfaces are formed at an angle substantially along a ray of refracted light in which the incident light is refracted by the first refracting surface, according to any one of claims 16 to 28. Light receiving module.

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