JP6291267B2 - Luminous flux control member, light emitting device, and illumination device - Google Patents

Description

  The present invention relates to a light flux controlling member that controls light distribution of light emitted from a light emitting element, a light emitting device having the light flux controlling member, and an illumination device.

  In recent years, from the viewpoint of energy saving and downsizing, a light emitting device (LED flash) using a light emitting diode (hereinafter also referred to as “LED”) as a light source has been used as a light emitting device for an imaging camera. As such a light emitting device, a combination of an LED and a Fresnel lens is well known.

  Generally, the shape of the imaging region of the imaging camera is a quadrangle. Therefore, in order to obtain a clear captured image, it is preferable that the light emitting device illuminates the irradiated region in a square shape. Therefore, a Fresnel lens used in a light-emitting device for an imaging camera is required to uniformly and efficiently irradiate light emitted from the light-emitting element onto a rectangular irradiated region. Until now, various types of Fresnel lenses for illuminating a quadrangular irradiated region have been proposed (see, for example, Patent Document 1).

  FIG. 1A is a perspective view of the Fresnel lens 10 described in Patent Document 1. FIG. The Fresnel lens 10 shown in FIG. 1A can perform the same function as the cylindrical lens 20 shown in FIG. 1B. As shown in FIG. 1A, in the Fresnel lens 10 described in Patent Document 1, a plurality of grooves 12 having a rectangular shape in plan view are formed concentrically apart from each other. One surface of the formed groove 12 becomes the incident surface of the Fresnel portion, and the other surface becomes the reflecting surface of the Fresnel portion.

JP-A-11-65490

  When the Fresnel lens 10 described in Patent Document 1 is manufactured, a plurality of mold pieces corresponding to a shape obtained by dividing the Fresnel lens 10 is generally manufactured. Next, the Fresnel lens 10 is manufactured using a mold in which the manufactured mold pieces are combined. Then, using LED, the quality of the to-be-irradiated surface in the produced Fresnel lens 10 is confirmed. Then, the corresponding surface of the die piece corresponding to the reflecting surface is finely adjusted so as to obtain a quality according to the request, and the Fresnel lens 10 is generally finished in a final shape.

  However, in the Fresnel lens 10 described in Patent Document 1, in order to correct the shape of a part of the corresponding surface of the mold piece corresponding to one reflecting surface of the Fresnel portion, other portions that do not require correction on the corresponding surface are also included. There was a need to fix. Therefore, even when correcting a part of the corresponding surface, it is necessary to correct the entire corresponding surface. Further, when measuring the shape of the reflecting surface in order to specify the correction location, the entire reflection surface has to be specified from one reference point, and it is difficult to specify the correction location. As described above, in the Fresnel lens 10 described in Patent Document 1, the process of correcting the reflecting surface is complicated.

  This invention is made | formed in view of this point, and it aims at providing the light beam control member which can correct the shape of a reflective surface easily. Another object of the present invention is to provide a light emitting device and a lighting device having the light flux controlling member.

  The light flux controlling member of the present invention is a light flux controlling member for controlling the light distribution of the light emitted from the light emitting element, and is formed on the opposite side of the incident area where the light emitted from the light emitting element is incident. And an exit area for emitting the light incident on the incident area, and the entrance area is disposed on the inside of the entrance area, and an entrance surface on which a part of the light emitted from the light emitting element is incident, and A plurality of ridges disposed on the outside and having a reflection surface that reflects incident light toward the emission region; and a ridge line disposed between the incidence surface and the reflection surface; It is disposed so as to connect two adjacent diagonal lines of a quadrangle, and at least one of the reflection surfaces is disposed in parallel with the convex extending direction, and the light incident on the incident surface is incident on the emission region. Multiple split reflective surfaces that reflect toward , Be between adjacent said two split reflecting surfaces, a configuration having one or two or more stepped surface disposed at the position of the blind spot with respect to the traveling direction of the light incident at the incident surface.

  The light emitting device of the present invention employs a configuration having a light emitting element and the light flux controlling member of the present invention.

  The illuminating device of this invention takes the structure which has the light-emitting device of this invention, and the cover which permeate | transmits while diffusing the emitted light from the said light-emitting device.

  The light flux controlling member of the present invention can easily correct the shape of the reflecting surface. Therefore, the light emitting device and the lighting device of the present invention can easily adjust the quality of the irradiated region.

1A and 1B are diagrams illustrating a configuration of a Fresnel lens according to Patent Document 1. FIG. FIG. 2 is a cross-sectional view of the light emitting device according to the first embodiment. FIG. 3 is a perspective view of the light flux controlling member according to the first embodiment. 4A to 4C are diagrams showing the configuration of the light flux controlling member according to the first embodiment. 5A and 5B are bottom views in which the refractive part, the Fresnel lens part, and the reflective part of the light flux controlling member according to Embodiment 1 are omitted. 6A and 6B are cross-sectional views of the light flux controlling member according to the first embodiment. FIG. 7 is a diagram for explaining the arrangement of the second ridges and the corners. 8A to 8C are diagrams for explaining the three-dimensional shape of the corner. 9A and 9B are diagrams for explaining the three-dimensional shape of the corner. 10A and 10B are part of an optical path diagram in the light flux controlling member. FIG. 11 is a cross-sectional view of the lighting device. FIG. 12 is a perspective view of a light flux controlling member according to a comparative example. 13A to 13C are diagrams illustrating a configuration of a light flux controlling member according to a comparative example. FIG. 14 is a perspective view of the light flux controlling member according to the second embodiment. 14A to 14C are diagrams illustrating the configuration of the light flux controlling member according to the second embodiment. 16A and 16B are cross-sectional views of the light flux controlling member according to the second embodiment. FIG. 17 is a part of an optical path diagram in the light flux controlling member.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Embodiment 1]
(Configuration of luminous flux control member and light emitting device)
FIG. 2 is a cross-sectional view of light-emitting device 100 according to Embodiment 1 of the present invention. As shown in FIG. 2, the light emitting device 100 includes a light emitting element 120 and a light flux controlling member 140. The light emitting element 120 is a light emitting diode (LED) such as a white light emitting diode. The light flux controlling member 140 controls the light distribution of the light emitted from the light emitting element 120. The light flux controlling member 140 is arranged so that the central axis CA thereof coincides with the optical axis LA of the light emitting element 120.

  The material of the light flux controlling member 140 is not particularly limited as long as it can transmit light having a desired wavelength. For example, the material of the light flux controlling member 140 is a light transmissive resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), and epoxy resin (EP), or glass. The light flux controlling member 140 can be manufactured by, for example, injection molding.

  3-7 is a figure which shows the structure of the light beam control member 140 which concerns on Embodiment 1. FIG. FIG. 3 is a perspective view of light flux controlling member 140 according to the first embodiment. 4A is a plan view of the light flux controlling member 140, FIG. 4B is a bottom view, and FIG. 4C is a side view. 5A is a bottom view of the light flux control member 140 showing only the first virtual quadrangle S1, and FIG. 5B is a bottom view of the light flux control member 140 showing only the first virtual quadrangle S1 and the second virtual quadrangle S2. is there. 6A is a cross-sectional view taken along line AA shown in FIG. 4B, and FIG. 6B is a partially enlarged cross-sectional view of a region indicated by a broken line in FIG. 6A. FIG. 7 is a diagram for explaining the arrangement of the second ridges 171 and the corners 172.

  As shown in FIG. 3 to FIG. 7, the light flux controlling member 140 is located on the opposite side of the incident area 141 where the light emitted from the light emitting element 120 is incident and the light incident on the incident area 141. And an emission region 142 that emits light. A flange 143 may be provided between the incident area 141 and the emission area 142.

  The planar view shape of the light flux controlling member 140 is not particularly limited. As shown in FIG. 4A, in the present embodiment, the planar view shape of light flux controlling member 140 is a square. Further, the length of one side of the light flux controlling member 140 in the present embodiment is, for example, about 4.7 mm.

  The incident area 141 allows light emitted from the light emitting element 120 to enter. The incident area 141 includes a refracting part 150 located at the center of the incident area 141, a Fresnel lens part 160 located outside the refracting part 150, and an outermost lens part 170 located outside the Fresnel lens part 160. . The incident region 141 is two-fold symmetric or four-fold symmetric. The outer shape of the incident region 141 is, for example, a rectangle or a square.

  The refracting unit 150 causes a part of the light emitted from the light emitting element 120 (light emitted at a small angle with respect to the optical axis LA) to enter the light flux control member 140, and the incident light to the emission region 142. Refract toward. The refracting unit 150 is disposed at a position facing the light emitting element 120 so as to intersect the central axis CA of the light flux controlling member 140 (the optical axis LA of the light emitting element 120) (see FIG. 2). The shape of the refracting portion 150 is not particularly limited as long as the above function can be exhibited. For example, the shape of the refractive part 150 may be a refractive type Fresnel lens. Further, the surface of the refraction part 150 may be a spherical surface or an aspherical surface. In the present embodiment, the surface of the refracting portion 150 is an aspheric surface, and the shape of the refracting portion 150 is a substantially quadrangular pyramid (see FIGS. 2 and 3).

  The Fresnel lens unit 160 causes a part of light emitted from the light emitting element 120 (light emitted at a relatively large angle with respect to the optical axis LA) to enter the light flux control member 140 and emit the incident light. Reflected toward the region 142. The Fresnel lens unit 160 includes a plurality of first ridges (projections) 161 for controlling the traveling direction of the light emitted from the light emitting element 120.

  As shown in FIG. 5A, it is assumed that a first virtual quadrangle (virtual quadrangle) S <b> 1 is arranged in the Fresnel lens unit 160. The center O1 (intersection of the diagonal line L1) of the first virtual quadrangle S1 coincides with the central axis CA of the light flux controlling member 140. The first virtual quadrangle S1 and the four diagonals L1 serve as a reference for the arrangement of the plurality of first ridges 161. The plurality of first ridges 161 are arranged so as to connect two adjacent diagonal lines L1. The plurality of first ridges 161 may be linear or curved. The plurality of first ridges 161 are arranged such that valleys are formed between two adjacent first ridges 161 in a region between two adjacent diagonal lines L1 (see FIG. 6B).

  The shape and size of the first ridge 161 are not particularly limited, and may be the same or different. In the present embodiment, the sizes of the plurality of first ridges 161 are different from each other (see FIG. 6B). Further, the distance d (the distance d from the reference surface to the first ridge line 165) between the lower end of the light flux controlling member 140 and the first ridge line 165 of each first protrusion 161 in the direction of the optical axis LA is from the inside to the outside. It gradually becomes shorter as it goes (see FIG. 6B). Here, “the lower end portion of the light flux controlling member 140” means a top portion (second ridge line 176) of a second ridge 171 described later, and “reference plane” means a top portion (second portion) of the second ridge 171. It means a plane including the ridge line 176).

  The first ridge 161 has a first incident surface 162, a first reflecting surface 163, a first connection surface 164, and a first ridge line 165. In the first ridge 161, the first incident surface 162 is disposed on the inner side (center axis CA side), and the first reflecting surface 163 is disposed on the outer side (see FIG. 6B).

  The first incident surface 162 allows a part of the light emitted from the light emitting element 120 to be incident and refracted toward the first reflecting surface 163 side. The first incident surface 162 may be a flat surface or a curved surface. In the present embodiment, the first incident surface 162 is a flat surface. In addition, the first incident surface 162 is preferably slightly inclined with respect to the central axis CA from the viewpoint of forming the light flux controlling member 140. The first incident surface 162 is inclined away from the central axis CA as it approaches the lower end portion (reference surface) of the light flux controlling member 140. The inclination angle of the first incident surface 162 is preferably greater than 0 ° and within a range of 10 ° or less with respect to the central axis CA in any cross section including the central axis CA. The inclination angle of the first incident surface 162 is preferably 5 ° or less, and more preferably 3 ° or less.

  The first reflecting surface 163 is formed in a pair with the first incident surface 162, and reflects the light incident on the first incident surface 162 toward the emission region 142. The first reflecting surface 163 may be a flat surface or a curved surface. In the present embodiment, the first reflecting surface 163 is a flat surface. Moreover, it is preferable that the 1st reflective surface 163 inclines with respect to central axis CA from a viewpoint of totally reflecting the arrived light. The first reflecting surface 163 is inclined so as to approach the central axis CA as it approaches the lower end portion (reference surface) of the light flux controlling member 140.

  The first connection surface 164 is disposed between the first incident surface 162 and the first reflecting surface 163. The first connecting surface 164 connects the first incident surface 162 and the first reflecting surface 163. The first connection surface 164 may be a flat surface or a curved surface. In the present embodiment, the first connection surface 164 is a flat surface. Further, the first incident surface 162 and the first reflecting surface 163 may be directly connected without forming the first connection surface 164.

  The first ridge line 165 is a boundary line between the first incident surface 162 and the first connection surface 164. The first ridge line 165 is disposed so as to connect two adjacent diagonal lines L1 of the first virtual quadrangle S1. When the first connection surface 164 is not formed, the first ridge line 165 is a boundary line between the first incident surface 162 and the first reflecting surface 163. When the 1st connection surface 164 is provided between the 1st entrance plane 162 and the 1st reflective surface 163, productivity can be improved by eliminating an acute angle part. When the incident region 141 is viewed in plan, the first ridge line 165 may be a straight line or a curved line. In the present embodiment, when the incident region 141 is viewed in plan, the first ridge line 165 is a straight line.

  The outermost lens unit 170 causes a part of the light emitted from the light emitting element 120 (light emitted at a large angle with respect to the optical axis LA) to enter the light flux control member 140, and the incident light is emitted from the emission region. Reflect toward 142. The outermost lens unit 170 includes four second ridges 171 and four corners 172.

  As shown in FIG. 5B, it is assumed that the second virtual quadrangle S2 is arranged on the outermost lens unit 170. The center O2 (intersection point of the second diagonal L2) of the second virtual quadrangle S2 coincides with the central axis CA of the light flux controlling member 140. The second virtual quadrangle S2 is a reference for the arrangement of the four second ridges 171 and the four corners 172. The second virtual quadrangle S2 is disposed outside the first virtual quadrangle S1. The second virtual quadrangle S2 and the first virtual quadrangle S1 are similar to each other and are arranged so as to be concentric and parallel to each side. As described above, the first ridge line 165 may be disposed so as to connect two adjacent diagonal lines L1 of the first virtual quadrangle S1. Therefore, the first ridge line 165 and the second ridge line 176 described later may be formed in a curved line and may not be parallel.

  The four second ridges 171 are arranged on each side of the second virtual quadrangle S2. The cross-sectional area of the second ridge 171 on the surface orthogonal to the side on which the second ridge 171 is arranged is that of the first ridge 161 on the surface orthogonal to the side on which the second ridge 171 is arranged. Greater than cross-sectional area. Corner portions 172 are connected to both ends of the second ridge 171. The length of the second ridge 171 in the direction parallel to the side of the second virtual quadrangle S2 is shorter than the length of the first ridge 161 arranged on the outermost side. When the light flux controlling member 140 is used in the above light emitting device 100, the length of the second ridge 171 in the direction parallel to the side of the second virtual quadrangle S2 is longer than the width of the light emitting element 120 used in the light emitting device 100. It is preferable.

  The 2nd protruding item | line 171 is formed in the substantially triangular prism shape. The cross-sectional shape of the second ridge 171 on the surface orthogonal to the side where the second ridge 171 is disposed is a substantially triangular shape. Each second ridge 171 has a second incident surface 173, a second reflecting surface 174, a second connection surface 175, and a second ridge line 176. In the second ridge 171, the second incident surface 173 is disposed on the inner side (center axis CA side), and the second reflecting surface 174 is disposed on the outer side (see FIG. 6B).

  The second incident surface 173 allows the light emitted from the light emitting element 120 to enter and refract the light toward the second reflecting surface 174 side. The second incident surface 173 may be a flat surface or a curved surface. In the present embodiment, the second incident surface 173 is a flat surface. The second incident surface 173 may be a vertical surface parallel to the central axis CA, or may be an inclined surface that is inclined with respect to the central axis CA. In the present embodiment, the second incident surface 173 is inclined so as to be away from the central axis CA as it approaches the lower end portion (reference surface) of the light flux controlling member 140.

  The second reflecting surface 174 is formed in a pair with the second incident surface 173 and reflects the light incident on the second incident surface 173 toward the emission region 142. The second reflecting surface 174 has a plurality of divided reflecting surfaces 177 and step surfaces 178. The divided reflection surfaces 177 and the step surfaces 178 are alternately arranged so as to trace the surface of the second reflection surface 174 from the light emitting element 120 side toward the emission region 142 side.

  The split reflection surface 177 reflects the light incident on the second incident surface 173 toward the emission region 142. The divided reflection surface 177 is disposed in parallel with the extending direction of the second ridges 171. The number of the divided reflection surfaces 177 is not particularly limited as long as it is plural. In the present embodiment, the number of split reflection surfaces 177 is four. The split reflection surface 177 may be formed with the same width from one end to the other end in the extending direction of the second ridge 171 or may be formed with a different width. In the present embodiment, the split reflection surface 177 is formed with the same width from one end to the other end. Further, the plurality of split reflection surfaces 177 may all be formed with the same width, or may be formed with different widths. In the present embodiment, the plurality of divided reflection surfaces 177 are formed with different widths. Further, the divided reflection surface 177 may be a flat surface or a curved surface. In the present embodiment, the divided reflection surface 177 is a curved surface. Specifically, the divided reflection surface 177 is a straight line in a cross section (horizontal cross section) orthogonal to the central axis CA. The divided reflection surface 177 is a curved line that protrudes outward in a cross section (vertical cross section) including the central axis CA. The divided reflection surface 177 is inclined so as to approach the central axis CA as it approaches the lower end portion (reference surface) of the light flux controlling member 140. In addition, in the direction orthogonal to the second virtual quadrangle S2, the upper end of the divided reflection surface 177 arranged on the light emitting element 120 side among the two divided reflection surfaces 177 adjacent to each other is the other arranged on the emission region 142 side. It arrange | positions in the same position as the lower end of the division | segmentation reflective surface 177 (refer FIG. 10B). The “direction orthogonal to the second virtual quadrangle S <b> 2” matches the central axis CA of the light flux controlling member 140 and the optical axis LA of the light emitted from the light emitting element 120.

  The step surface 178 is disposed between two adjacent divided reflection surfaces 177. The step surface 178 is disposed at a blind spot with respect to the traveling direction of the light incident on the second incident surface 173. Here, “dead angle” refers to a region where incident light does not pass directly. That is, the light incident on the second incident surface 173 does not reach the step surface 178 directly. The number of division | segmentation reflective surfaces 177 is one or two or more. For example, when there are two divided reflection surfaces 177, there is one step surface 178. Further, when there are four divided reflection surfaces 177, there are three step surfaces 178. The step surface 178 may be formed with the same width from one end to the other end in the extending direction of the second ridge 171, or may be formed with a different width. In the present embodiment, the step surface 178 is formed corresponding to the width of the divided reflection surface 177. Further, the step surface 178 may be a flat surface or a curved surface. In the present embodiment, the step surface 178 is a flat surface. The inclination angle of the step surface 178 is not particularly limited as long as it is incident on the second incident surface 173 and light does not reach directly. The inclination angle of the step surface 178 is the upper end portion of the split reflection surface 177 (the end on the emission region 142 side) of the light incident on the second incident surface 173 in a cross section including a straight line perpendicular to the second virtual quadrangle S2. Part) and the angle formed by the straight line in the direction (center axis CA) perpendicular to the surface of the second virtual quadrangle S2 (see FIG. 10B). In the present embodiment, the angle of the step surface 178 with respect to the straight line in the direction perpendicular to the surface of the second virtual quadrangle S2 is 90 ° (parallel to the surface of the second virtual quadrangle S2).

  The second ridge line 176 is a boundary line between the second incident surface 173 and the second connection surface 175. Note that the second ridge line 176 is a boundary line between the second incident surface 173 and the second reflecting surface 174 (divided reflecting surface 177) when the second connecting surface 175 is not formed. Thus, when the 2nd connection surface 175 is provided between the 2nd incident surface 173 and the 2nd reflective surface 174, productivity can be improved by eliminating an acute angle part. Moreover, as FIG. 7 shows, the distance d1 between the edge parts of the 2nd ridgeline 176 is shorter than the distance d2 between the edge parts of the 1st ridgeline 165 of the 1st protruding item | line 161 located in the outermost side. When the light flux controlling member 140 is used in the light emitting device 100 described above, the distance d1 between the ends of the second ridge line 176 is preferably longer than the width of the light emitting element 120 used in the light emitting device 100.

  The four corners 172 are respectively arranged at the four corners of the second virtual quadrangle S2. The corner 172 is a part of a substantially pyramid whose apex is arranged on the center O2 side of the second virtual quadrangle S2. The corner portion 172 includes a third incident surface 181, a third reflecting surface 182, and a third ridge line 183 (see FIG. 9). Here, the “substantially cone (cone)” refers to a three-dimensional shape formed by connecting the outer periphery of the bottom surface with a straight line or a curve. An example of a substantially pyramid (cone) is a pyramid, a line connecting the apex and the point on the circumference of the bottom face is an outward convex convex pyramid, and a line connecting the apex and the point on the circumference of the base is inside A convex substantially pyramid, a cone, a substantially cone having a generatrix that protrudes outward, a substantially cone having a generatrix that protrudes inward, and the like are included. In the present embodiment, the substantially cone (cone) is a substantially cone having a generatrix protruding outward.

  The third incident surface 181 allows a part of the remaining portion of the light emitted from the light emitting element 120 to be incident and refracted toward the third reflecting surface 182 side. The third incident surface 181 may be a flat surface or a curved surface. In the present embodiment, the third incident surface 181 is composed of two planes. The two planes are preferably inclined with respect to the central axis CA. The two planes are inclined so as to be away from the central axis CA as they approach the lower end (reference plane) of the light flux controlling member 140, respectively. Further, the two planes constituting the third incident surface 181 may be formed on the same plane as the adjacent second incident surface 173.

  The third reflecting surface 182 is formed in a pair with the third incident surface 181 and reflects the light incident on the third incident surface 181 toward the emission region 142. In the present embodiment, the third reflecting surface 182 is a curved surface. The outer edge of the cross section (horizontal cross section) orthogonal to the central axis CA of the third reflecting surface 182 is a curve that is convex outward. Further, the outer edge of the cross section (vertical cross section) including the central axis CA of the third reflecting surface 182 is also a curve that is convex outward. The third reflecting surface 182 corresponds to a part of the substantially conical side surface, and is connected so as to connect two adjacent second reflecting surfaces 174.

  The third ridge line 183 is a boundary line between the third incident surface 181 and the third reflecting surface 182. As will be described later, the third ridge line 183 is a curve formed such that the distance from the emission region 142 gradually decreases from the second ridge 171 side toward the second diagonal L2 of the second virtual quadrangle S2. Further, as shown in FIG. 7, when the incident region 141 is viewed in plan, the distance d3 between the outermost edge of the third reflecting surface 182 and the third ridge line 183 approaches the diagonal line L2 of the second virtual quadrangle S2. Therefore, it gradually decreases. Thus, the recessed part is formed in the position where the corner | angular part 172 and the 2nd diagonal L2 of 2nd virtual quadrangle | tetragon S2 cross. Note that the connecting surface (third connecting surface) may be formed by chamfering the boundary between the third incident surface 181 and the third reflecting surface 182. In this case, the third ridge line 183 is a boundary line between the third incident surface 181 and the third connection surface.

  8 and 9 are diagrams for explaining the three-dimensional shape of the corner 172. FIG. 8C is a perspective view seen from the direction of the arrow shown in FIG. 8B. As described above, the corner portion 172 is a part of a substantially cone (cone). Here, a substantially cone having a circular bottom surface is assumed (see FIG. 8A). Then, a substantially cone is cut in the vertical direction with a cross having a predetermined width (see FIGS. 8B and 8C). At this time, the width of the cross is the same as the length of the second ridge 171 in the direction of the side of the second virtual quadrangle S2. Next, a part of the center side of the substantially cone is removed so that the third incident surface 181 has the above inclination (see FIGS. 9A and 9B). At this time, since the substantially conical side surface is a curved surface, the distance between the third ridge line 183 and the emission region 142 gradually decreases from the second ridge 171 side toward the second diagonal L2 of the second virtual quadrangle S2. Formed. In the present embodiment, all of the third reflecting surfaces 182 of the four corners 172 are part of one substantially conical side surface having a vertex on the central axis CA of the light flux controlling member 140 (light flux control). The center axis CA of the member 140 and the center axis of the substantially cone are the same). However, the four third reflecting surfaces 182 may be part of the side surfaces of substantially cones having different central axes.

  The emission region 142 is a plane formed on the irradiated region side opposite to the light emitting element 120. The emission region 142 is formed so as to intersect the central axis CA of the light flux controlling member 140 (see FIG. 2). The exit region 142 is incident on the refraction unit 150, incident on the first incident surface 162, reflected on the first reflecting surface 163, incident on the second incident surface 173, and reflected on the second reflecting surface 174. Then, the light incident on the third incident surface 181 and reflected by the third reflecting surface 182 is emitted toward the irradiated region.

  FIG. 10 is a part of an optical path diagram in the light flux controlling member 140. 10A shows the optical path of light in a part of the cross-sectional view taken along the line AA shown in FIG. 4, and FIG. 10B is a partially enlarged view of the region indicated by the alternate long and short dash line in FIG. 10A. 10A and 10B, hatching is omitted to show the optical path.

  As shown in FIG. 10A, the light incident on the second incident surface 173 is refracted toward the second reflecting surface 174. Then, the light that reaches the split reflection surface 177 of the second reflection surface 174 is reflected toward the emission region 142. At this time, as shown in FIG. 10B, the step surface 178 is located at a blind spot (see the shaded portion in FIG. 10B) with respect to the traveling direction of the incident light (does not function as a reflective surface or a refractive surface). That is, the light incident on the second incident surface 173 does not reach the step surface 178 directly.

(Configuration of lighting device)
Next, the illuminating device 400 which has the light-emitting device 100 which concerns on this Embodiment is demonstrated.

  FIG. 11 is a diagram showing a configuration of lighting apparatus 400 according to the present embodiment. As illustrated in FIG. 11, the lighting device 400 includes the light emitting device 100 and a cover 420. As described above, the light emitting device 100 includes the light flux controlling member 140 and the light emitting element 120. The light emitting element 120 is fixed to the substrate 440.

  The cover 420 diffuses and transmits the light emitted from the light emitting device 100 and protects the light emitting device 100. The cover 420 is disposed on the optical path of light emitted from the light emitting device 100. The material of the cover 420 is not particularly limited as long as the above function can be exhibited. The material of the cover 420 is a light transmissive resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), and epoxy resin (EP), or glass.

(effect)
As described above, the light flux controlling member 140 according to the present embodiment has the second reflecting surface (reflecting surface) 174 having the split reflecting surface 177 and the stepped surface 178. For example, as shown in FIG. In the cross section passing through the axis CA, when correction is required between the points C and D, it is not necessary to correct between the points A and B and between the points E and F. That is, it is not necessary to correct the entire second reflecting surface 174. In addition, since the boundary between the second reflecting surface 174 and the step surface 178 serves as a reference point for measuring the second reflecting surface 174, many reference points can be provided. Therefore, the second reflecting surface 174 can be adjusted with high accuracy. Furthermore, the light flux controlling member 140 has the stepped surface 178 disposed at a blind spot with respect to the traveling direction of the light incident on the second incident surface 173, and thus does not affect the control of the light flux.

  12 and 13 are diagrams showing a configuration of a light flux controlling member 140 'according to a comparative example. FIG. 12 is a perspective view of a light flux controlling member 140 'according to a comparative example. FIG. 13A is a bottom view of the light flux controlling member 140 ′, FIG. 13B is a side view, and FIG. 13C is a partially enlarged view of a region indicated by a broken line in FIG. 13B.

  As shown in FIGS. 12 and 13, the light flux controlling member 140 ′ according to the comparative example has an incident area 141 ′ and an exit area 142. The incident region 141 'has a refracting portion 150, a Fresnel lens portion 160, and an outermost lens portion 170'. The outermost lens portion 170 ′ has a second convex strip 171 ′ and a corner portion 172. The second ridge 171 'has a second incident surface 173 and a second exit surface 174'. That is, in the light flux controlling member 140 ′ of the comparative example, the second reflecting surface 174 ′ does not have the split reflecting surface 177 and the step surface 178. Thus, since 2nd reflective surface 174 'is formed by one surface, even when correcting only a part of 2nd reflective surface 174', 2nd reflective surface 174 'whole is corrected. There is a need.

[Embodiment 2]
The light emitting device and the illuminating device according to Embodiment 2 are different from the light emitting device 100 and the illuminating device 400 according to Embodiment 1 in the shape of the light flux controlling member 240, respectively. The light flux controlling member 240 according to the second embodiment differs from the light flux controlling member 140 according to the first embodiment only in the second reflecting surface 274 of the outermost lens portion 270, except for the split reflecting surface 277 and the step surface 278. Therefore, the same components as those of the light-emitting device 100 and the illumination device 400 according to Embodiment 1 are denoted by the same reference numerals, and the description thereof will be omitted, and different components of the light flux controlling member 240 will be mainly described.

(Configuration of luminous flux control member)
14-17 is a figure which shows the structure of the light beam control member 240 which concerns on Embodiment 2. FIG. FIG. 14 is a perspective view of light flux controlling member 240 according to the second embodiment. 15A is a bottom view of light flux controlling member 240, FIG. 15B is a side view, and FIG. 15C is a partially enlarged view of a region indicated by a broken line in FIG. 15B. 16A is a cross-sectional view taken along line BB shown in FIG. 15, and FIG. 16B is a partially enlarged view of a region surrounded by a broken line in FIG. 16A. FIG. 17 is a part of an optical path diagram in the light flux controlling member 240.

  As shown in FIGS. 14 to 17, the incident region 241 of the light flux controlling member 240 according to the second embodiment includes a refracting unit 150, a Fresnel lens unit 160, and an outermost lens unit 270.

  The outermost lens part 270 has four second ridges 271 and four corners 172. The four second ridges 271 have a second incident surface 173 and a second reflecting surface 274. The second reflecting surface 274 has a divided reflecting surface 277 and a step surface 278. The divided reflection surface 277 and the step surface 278 are alternately arranged on the surface of the second reflection surface 274 from the light emitting element 120 side toward the emission region 142 side.

  In the direction perpendicular to the surface of the second virtual quadrangle S2, the upper end of the divided reflective surface 277 arranged on the light emitting element 120 side among the two divided reflective surfaces 277 adjacent to each other is the other arranged on the emission region 142 side. It arrange | positions from the lower end of the division | segmentation reflective surface 277 at the radiation | emission area | region 142 side. That is, two adjacent divided reflection surfaces 277 are arranged so as to partially overlap in the horizontal direction.

  The step surface 278 is disposed between two adjacent divided reflection surfaces 277. The step surface 278 is inclined so as to approach the emission region 142 side toward the central axis CA.

(effect)
The light emitting device and the lighting device according to the second embodiment have the same effects as those of the first embodiment.

  In addition, even if the reflective surface (the 1st reflective surface 163 and the 2nd reflective surface 174,274) of a convex line (the 1st convex line 161 and the 2nd convex line 171,271) has a division | segmentation reflective surface and a level | step difference surface. Good. Moreover, only the 1st reflective surface 163 of the 1st protruding item | line 161 has a division | segmentation reflection surface and a level | step difference surface, and the 2nd reflection surface 171 does not need to have a division | segmentation reflection surface and a level | step difference surface.

  Further, the first ridge line 165 of the first ridge 161 may be a curved line convex toward the central axis CA, or may be a curved line convex outward.

  Further, the outermost lens portions 170 and 270 may not have the four corner portions 172. In this case, the outermost lens portions 170 and 270 are composed of four second convex strips 171 and 271.

  The light flux controlling member, the light emitting device, and the lighting device according to the present invention can easily adjust the quality of the irradiated region. The light emitting device according to the present invention is useful as, for example, a camera flash. Moreover, the illuminating device according to the present invention is useful as, for example, indoor general illumination, a surface light source device having a liquid crystal panel as an irradiated surface, and the like.

DESCRIPTION OF SYMBOLS 10 Fresnel lens 12 Groove 20 Cylindrical lens 100 Light-emitting device 120 Light-emitting device 140, 140'240 Light flux control member 141, 141'241 Incident area 142 Emission area 143 Flange 150 Refraction part 160 Fresnel lens part 161 First convex stripe 162 First incidence Surface 163 First reflecting surface 164 First connecting surface 165 First ridgeline 170, 170 ′, 270 Outermost lens portion 171, 171 ′, 271 Second convex stripe 172 Corner portion 173 Second incident surface 174, 174 ′, 274 First 2 reflective surface 175 2nd connection surface 176 2nd ridgeline 177, 277 Divisional reflective surface 178, 278 Step surface 181 3rd entrance surface 182 3rd reflective surface 183 3rd ridgeline 400 Illuminating device L1 1st diagonal L2 2nd diagonal S1 1st 1 virtual square S2 2nd virtual square CA center axis LA optical axis

Claims (5)

A light flux controlling member for controlling the light distribution of the light emitted from the light emitting element,
An incident region for entering light emitted from the light emitting element;
An emission region that is formed on the opposite side of the incidence region and emits light incident on the incidence region; and
Have
The incident area is disposed on the inner side, and is incident on the incident surface on which a part of the light emitted from the light emitting element is incident. The incident area is disposed on the outer side and reflects the incident light on the incident surface toward the outgoing area. A plurality of ridges having a reflecting surface and a ridge line disposed between the incident surface and the reflecting surface;
The ridges are arranged so as to connect two diagonal lines adjacent to each other in a virtual quadrangle,
At least one of the reflective surfaces is
A plurality of split reflection surfaces arranged parallel to the extending direction of the ridges and reflecting light incident on the incident surface of the ridges toward the emission region;
One or two or more step surfaces disposed between the adjacent two split reflection surfaces, which are disposed at a blind spot position with respect to a traveling direction of light incident on the incident surface of the ridge ,
I have a,
The light incident on the incident surface of the other ridge does not reach the reflective surface of the ridge,
Luminous flux control member.   In the direction orthogonal to the virtual quadrangle, of the two divided reflection surfaces adjacent to each other, the upper end of the divided reflection surface arranged on the light emitting element side is the other divided reflection surface arranged on the emission region side. The light flux controlling member according to claim 1, wherein the light flux controlling member is disposed at the same position as the lower end of the light beam.   In the direction orthogonal to the virtual quadrangle, of the two divided reflection surfaces adjacent to each other, the upper end of the divided reflection surface arranged on the light emitting element side is the other divided reflection surface arranged on the emission region side. The light flux controlling member according to claim 1, wherein the light flux controlling member is disposed closer to the emission region than a lower end of the light emitting device. A light emitting element;
The light flux controlling member according to any one of claims 1 to 3,
A light emitting device. A light emitting device according to claim 4;
A cover that diffuses and transmits light emitted from the light emitting device;
A lighting device.

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