JP6181377B2 - Luminous flux control member, light emitting device, lighting device, and mold - Google Patents

Description

  The present invention relates to a light flux control member that controls the light distribution of light emitted from a light emitting element, a light emitting device and an illumination device that have the light flux control member, and a mold for molding the light flux control member.

  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 (for example, see Patent Document 1).

  1A is a cross-sectional view of a light emitting device described in Patent Document 1. FIG. As shown in FIG. 1A, the light emitting device 10 described in Patent Document 1 includes a substrate 20, a light source substrate 21, a light source 30 including a light emitting element and a phosphor, and a Fresnel lens 40. The Fresnel lens 40 is disposed on the substrate 20 so as to face the light emitting surface of the light source 30.

  FIG. 1B is a cross-sectional view of the Fresnel lens 40. As shown in FIG. 1B, a refractive Fresnel lens part 41 and a reflective Fresnel lens part 42 are formed on one surface of the Fresnel lens 40. Each of the refractive type Fresnel lens part 41 and the reflective type Fresnel lens part 42 has a plurality of annular projections arranged concentrically. The refractive Fresnel lens portion 41 is formed at a position facing the light source 30. The reflective Fresnel lens part 42 is formed around the light source 30 around the refractive Fresnel lens part 41. In the Fresnel lens 40, the surface on which the refractive Fresnel lens portion 41 and the reflective Fresnel lens portion 42 are formed functions as the incident region 43, and the surface opposite to the incident region 43 functions as the output region 44.

  In the light emitting device 10 shown in FIG. 1A, light emitted from the light source 30 at a small angle with respect to the optical axis is refracted in a predetermined direction by the refractive Fresnel lens portion 41 and is emitted from the emission region 44. On the other hand, light emitted from the light source 30 at a large angle with respect to the optical axis is incident from the incident surface 45 of the reflective Fresnel lens portion 42, reflected in a predetermined direction by the reflective surface 46, and emitted from the emission region 44. The As described above, the light-emitting device 10 described in Patent Document 1 controls the light distribution of the light emitted from the light source 30 by using the Fresnel lens 40 having the refractive Fresnel lens unit 41 and the reflective Fresnel lens unit 42. ing.

JP 2011-192494 A

  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. However, when light is irradiated onto a rectangular irradiated region using the Fresnel lens of Patent Document 1, the four corners of the irradiated region may become dark. In addition, if light is sufficiently applied to the four corners of the irradiated region, it is necessary to spread the light, and wasteful light is generated. As described above, when the Fresnel lens of Patent Document 1 is used, the light emitted from the light emitting element cannot be uniformly and efficiently irradiated onto the irradiation region having a square shape.

  The present invention has been made in view of such points, and an object of the present invention is to provide a light flux controlling member capable of uniformly and efficiently irradiating light emitted from a light emitting element onto a rectangular irradiated region. To do. Another object of the present invention is to provide a light emitting device and an illuminating device having the light flux controlling member, and a mold for molding the light flux controlling member.

  The light flux controlling member of the present invention is a light flux controlling member that controls the light distribution of the light emitted from the light emitting element, and includes an incident area where the light emitted from the light emitting element is incident, and light incident from the incident area. And an incident region that intersects with the optical axis of the light emitting element, allows a part of the light emitted from the light emitting element to enter, and directs the incident light toward the emitting region. A refracting part to be refracted, and a Fresnel lens part located outside the refracting part, wherein the Fresnel lens part includes an incident surface on which a part of light emitted from the light emitting element is incident, and the incident surface. A plurality of ridges having a reflection surface that reflects incident light toward the emission region, and the plurality of ridges are similar to each other in plan view and are concentric and parallel on each side. Are arranged so that They are arranged on each side of the virtual rectangle, a configuration.

  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 molding die of the present invention is a molding die for molding the light flux controlling member of the present invention, and has a Fresnel lens part molding region for molding the Fresnel lens part, the Fresnel lens part molding region, Similar to each other in plan view, having a plurality of concave stripes arranged on each side of a plurality of virtual quadrangles arranged concentrically and parallel to each side, on each diagonal line of the virtual quadrangle, A configuration is adopted in which a groove portion is provided that separates the concave line disposed on one side of the virtual quadrangle and the concave line disposed on the other side adjacent to the one side in the virtual quadrangle.

  The light emitting device having the light flux controlling member of the present invention can uniformly and efficiently irradiate light emitted from the light emitting element onto a rectangular irradiated region. In addition, the illumination device of the present invention can uniformly and efficiently illuminate light on a rectangular irradiated region.

1A and 1B are diagrams showing a configuration of a light emitting device described in Patent Document 1. FIG. 2 is a cross-sectional view of the light emitting device according to Embodiment 1. FIG. 3A to 3D are diagrams showing the configuration of the light flux controlling member according to the first embodiment. 4A to 4C are cross-sectional views of the light flux controlling member according to the first embodiment. 5A to 5C are diagrams showing a configuration of a light flux controlling member of a comparative example. 6A to 6D are diagrams illustrating simulation results of illuminance distribution using the light emitting device of the comparative example. 7A and 7B are optical path diagrams in the light-emitting device according to Embodiment 1. FIG. 8A and 8B are optical path diagrams in the light emitting device according to Embodiment 1. FIG. 9A and 9B are optical path diagrams in the light-emitting device according to Embodiment 1. FIG. 10A and 10B are optical path diagrams in the light-emitting device according to Embodiment 1. FIG. 11A to 11D are diagrams illustrating simulation results of illuminance distribution using the light-emitting device according to Embodiment 1. FIG. 12A to 12D are diagrams illustrating simulation results of illuminance distribution using the light-emitting device according to Embodiment 1. FIG. 13A to 13D are diagrams illustrating simulation results of illuminance distribution using the light-emitting device according to Embodiment 1. FIG. 14A to 14D are diagrams illustrating simulation results of illuminance distribution using the light-emitting device according to Embodiment 1. FIG. It is a figure which shows the structure of the illuminating device which concerns on Embodiment 1. FIG. 16A and 16B are diagrams showing the configuration of the light flux controlling member according to the second embodiment. 17A to 17D are diagrams showing the configuration of the light flux controlling member according to the second embodiment. 18A to 18H are cross-sectional views of the light flux controlling member according to the second embodiment. 19A to 19C are diagrams showing the configuration of a molding die used for molding the light flux controlling member according to the second embodiment. 20A to 20D are diagrams illustrating the configuration of a molding die used for molding the light flux controlling member according to the second embodiment. 21A to 21H are cross-sectional views of a molding die used for molding the light flux controlling member according to the second embodiment. 22A and 22B are diagrams showing the configuration of the light flux controlling member according to the third embodiment. 23A to 23D are diagrams showing the configuration of the light flux controlling member according to the third embodiment. 24A to 24H are cross-sectional views of the light flux controlling member according to the third embodiment. 25A to 25C are diagrams showing the configuration of a molding die used for molding the light flux controlling member according to the third embodiment. 26A to 26C are diagrams showing the configuration of a molding die used for molding the light flux controlling member according to the third embodiment. 27A to 27H are cross-sectional views of a forming die used for forming the light flux controlling member according to the third embodiment.

  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 light flux controlling member 140 can be formed by injection molding. 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.

  3 and 4 are diagrams showing a configuration of light flux controlling member 140 according to the present embodiment. 3A is a plan view of the light flux controlling member 140, FIG. 3B is a side view, FIG. 3C is a bottom view, and FIG. 3D is a bottom view in which the refraction part 144 and the Fresnel lens part 145 are omitted. is there. 4A is a cross-sectional view taken along line AA shown in FIG. 3C, FIG. 4B is a cross-sectional view taken along line BB, and FIG. 4C is an enlarged view of a broken line portion shown in FIG. 4B.

  As shown in FIGS. 3 and 4, 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 from 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. The planar view shape of the light flux controlling member 140 of the present embodiment is a rectangle (more specifically, a square).

  The incident area 141 allows light emitted from the light emitting element 120 to enter. The incident region 141 includes a refracting portion 144 positioned at the center portion of the incident region 141 and a Fresnel lens portion 145 positioned outside the refracting portion 144.

  The refracting unit 144 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 enters the emission region 142. Refract toward. The refracting portion 144 is arranged 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 144 is not particularly limited as long as the above function can be exhibited. For example, the shape of the refracting portion 144 may be a spherical surface or an aspherical surface, or may be a refractive type Fresnel lens. The shape of the refracting portion 144 in the present embodiment is a quadrangular pyramid shape.

  The Fresnel lens unit 145 has a convex surface having an incident surface on which a part of the light emitted from the light emitting element 120 is incident and a reflective surface that is formed in a pair with the incident surface and reflects the incident light toward the emission region. Includes multiple articles. These ridges are arranged on each side of a plurality of virtual quadrangles that are similar to each other in a plan view and are arranged so as to be concentric and parallel to each side.

  More specifically, the Fresnel lens part 145 includes a first Fresnel lens part 145a located on the refraction part 144 side and a second Fresnel lens part 145b located outside the first Fresnel lens part 145a. As will be described later, the light incident from the refracting portion 144 and the second Fresnel lens portion 145b mainly illuminates the central portion of the irradiated region having a rectangular shape. On the other hand, the light incident from the first Fresnel lens portion 145a mainly illuminates the outer peripheral portion of the irradiation region having a quadrangular shape.

  The first Fresnel lens unit 145a causes a part of the light emitted from the light emitting element 120 (light emitted at a slightly large angle with respect to the optical axis LA) to enter the light flux controlling member 140, and the incident light The light is reflected toward the emission region 142 (see FIG. 8A). The first Fresnel lens portion 145a is assumed to be a plurality of first virtual quadrilaterals S1 (see FIG. 3D) that are similar to each other in plan view and arranged so as to be concentric and parallel to each side. The plurality of first ridges 147 disposed on each side of the first ridge. The first virtual quadrangle S1 corresponds to the above-described virtual quadrangle, and the first ridge 147 corresponds to the above-described ridge. The shape of the first virtual quadrangle S1 is not particularly limited. The shape of the first virtual quadrangle S1 of the present embodiment is a rectangle (more specifically, a square).

  The first ridges 147 arranged on one side of each first virtual quadrangle S1 may be in contact with the first ridges 147 arranged on the other adjacent side of the first virtual quadrangle S1 to which each first virtual quadrilateral S1 belongs. It may be good or separated. Usually, the 1st protruding item | line 147 arrange | positioned on arbitrary one sides of 1st virtual quadrangle | tetragon S1 is formed in the same shape from one end to the other end. Further, the shapes of the four first ridges 147 arranged on the four sides of the first virtual quadrangle S1 are the same. The size of the first ridge 147 in a certain first virtual quadrangle S1 and the size of the first ridge 147 in another first virtual quadrangle S1 may be the same or different.

  The first ridge 147 is a first inclined surface 148 that is an incident surface on which light emitted from the light emitting element 120 is incident, and a reflective surface that reflects light incident from the first inclined surface 148 toward the emission region 142. A second inclined surface 149. In each first ridge 147, the first inclined surface 148 is located on the inner side (center axis CA side), and the second inclined surface 149 is located on the outer side. Moreover, in each 1st protruding item | line 147, the 1st inclined surface 148 and the 2nd inclined surface 149 may be continuous, and may be discontinuous. In the former case, a ridge line is formed between the first inclined surface 148 and the second inclined surface 149. In the latter case, another surface is formed between the first inclined surface 148 and the second inclined surface 149. When another surface is provided between the first inclined surface 148 and the second inclined surface 149, the productivity can be improved by eliminating the acute angle portion (ridge line portion).

  In the cross section including the central axis CA, the first inclined surface 148 may be a straight line or a curved line. The angle of the first inclined surface 148 with respect to the optical axis LA of the light emitting element 120 is not particularly limited as long as the light incident from the first inclined surface 148 can be refracted to the second inclined surface 149 side. It can be set as appropriate according to the position. In the cross section including the central axis CA, when the first inclined surface 148 is a curve, the “angle of the first inclined surface 148” refers to the angle of the tangent line of the first inclined surface 148 at the light incident point.

  In the cross section including the central axis CA, the second inclined surface 149 may be a straight line or a curved line. The angle of the second inclined surface 149 with respect to the optical axis LA of the light emitting element 120 is such that the light incident from the first inclined surface 148 is on the emission region 142 side so that the light emitted from the emission region 142 is directed to the outer peripheral portion of the irradiated region. If it can be reflected, it will not be specifically limited. In the cross section including the central axis CA, when the second inclined surface 149 is a curve, the “angle of the second inclined surface 149” refers to the angle of the tangent line of the second inclined surface 149 at the light incident point.

  The second Fresnel lens unit 145b 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 emit the incident light. Reflection is performed toward the region 142 (see FIG. 8D). The second Fresnel lens portion 145b is similar to the first virtual quadrangle S1 in a plan view, and includes one or two or more second virtual quadrilaterals S2 arranged so as to be concentric with and parallel to the first virtual quadrangle S1. Assuming a plurality of second ridges 150 arranged on the four sides. The second virtual quadrangle S2 corresponds to the above-described virtual quadrangle, and the second ridge 150 corresponds to the above-described ridge. In this Embodiment, the case where it has the 4th 2nd protruding item | line 150 arrange | positioned on the four sides of one 2nd virtual quadrangle | tetragon S2 is shown.

  The second ridge 150 arranged on one side of the second virtual quadrangle S2 may be in contact with or separated from the second ridge 150 arranged on another side adjacent to the second virtual quadrangle S2. You may do it. Usually, the 2nd protruding item | line 150 arrange | positioned on arbitrary one sides of 2nd virtual quadrangle | tetragon S2 is formed in the same shape from one end to the other end. Further, the shapes of the four second ridges 150 arranged on the four sides of the second virtual quadrangle S2 are the same. The size of the second ridge 150 in one second virtual quadrangle S2 and the size of the second ridge 150 in another second virtual quadrangle S2 may be the same or different. In addition, the second convex line 150 is formed larger than the refractive part 144 and the first Fresnel lens part 145a from the viewpoint of allowing the light in the lateral direction that has not entered from the refractive part 144 and the first Fresnel lens part 145a to enter. Preferably it is.

  The second ridge 150 is a third inclined surface 151 that is an incident surface on which light emitted from the light emitting element 120 is incident, and a reflective surface that reflects light incident from the third inclined surface 151 toward the emission region 142. A fourth inclined surface 152. The third inclined surface 151 is located on the inner side (center axis CA side), and the fourth inclined surface 152 is located on the outer side. Further, the third inclined surface 151 and the fourth inclined surface 152 may be continuous or discontinuous. In the former case, a ridge line is formed between the third inclined surface 151 and the fourth inclined surface 152. In the latter case, another surface is formed between the third inclined surface 151 and the fourth inclined surface 152. When another surface is provided between the third inclined surface 151 and the fourth inclined surface 152, the productivity can be improved by eliminating the acute angle portion (ridge line portion).

  In the cross section including the central axis CA, the third inclined surface 151 may be a straight line or a curved line. The angle of the third inclined surface 151 with respect to the optical axis LA of the light emitting element 120 is not particularly limited as long as the light incident from the third inclined surface 151 can be refracted to the fourth inclined surface 152 side. It can be set as appropriate according to the position. In the cross section including the central axis CA, when the third inclined surface 151 is a curve, the “angle of the third inclined surface 151” means an angle of a tangent line of the third inclined surface 151 at the light incident point.

  In the cross section including the central axis CA, the fourth inclined surface 152 may be a straight line or a curved line. The angle of the fourth inclined surface 152 with respect to the optical axis LA of the light emitting element 120 is such that the light incident from the first inclined surface 148 is on the emission region 142 side so that the light emitted from the emission region 142 is directed to the central portion of the irradiated region. If it can be reflected, it will not be specifically limited. In the cross section including the central axis CA, when the fourth inclined surface 152 is a curve, the “angle of the fourth inclined surface 152” refers to the angle of the tangent line of the fourth inclined surface 152 at the light incident point.

[Optical path simulation and illumination simulation]
For the light emitting device 100 having the light flux controlling member 140 according to the present embodiment shown in FIGS. 3 and 4, a simulation of the optical path of light emitted from the light emitting element 120 and a simulation of the illuminance distribution were performed. For comparison, the light emitting device having the light flux controlling member 50 shown in FIG. 5 was also simulated for the optical path of light emitted from the light emitting element and the illuminance distribution.

  5A is a plan view of a light flux controlling member 50 of a comparative example, FIG. 5B is a cross-sectional view taken along line CC shown in FIG. 5A, and FIG. 5C is a bottom view. As shown in FIG. 5, the light flux controlling member 50 of the comparative example is related to the present embodiment in that the shape in plan view is a circle, and a plurality of annular convex portions 60 are arranged concentrically. Different from the light flux controlling member 140.

  FIG. 6 is a diagram illustrating a simulation result of illuminance distribution using the light emitting device of the comparative example. FIG. 6A is a simulation result of the illuminance distribution in the case of assuming an irradiated region 100 mm away from the light emitting surface of the light emitting element, and FIG. 6B is a case in which an irradiated region 500 mm away from the light emitting surface of the light emitting element is assumed. FIG. 6C is a simulation result of the illuminance distribution, and FIG. 6C is a simulation result of the illuminance distribution in the case of assuming an irradiated region 1000 mm away from the light emitting surface of the light emitting element, and FIG. 6D is 1500 mm away from the light emitting surface of the light emitting element. It is a simulation result of the illuminance distribution when the irradiated region is assumed. The vertical axis and the horizontal axis in the left diagrams of FIGS. 6A to 6D indicate the distance (mm) from the optical axis LA (the central axis CA of the light flux controlling member 50) of the light emitting element. Moreover, the vertical axis | shaft in the right figure has shown illumination intensity (lux).

  6A to 6D, in the light emitting device having the light flux controlling member 50 of the comparative example, the outer shape of the illuminance distribution in the irradiated region was circular regardless of the distance from the light emitting surface of the light emitting element.

  7 to 10 are a plan view and an optical path diagram of the light emitting device 100 according to the present embodiment. 7A is a plan view of the light-emitting device 100, and FIGS. 7B, 8A, and 8B are cross sections taken along line D-D that are parallel to one side of the first virtual quadrangle S1 and the second virtual quadrangle S2 shown in FIG. 7A. FIG. FIG. 7B is an optical path diagram of light incident from the refraction part 144, the first Fresnel lens part 145a, and the second Fresnel lens part 145b in the cross section. In FIG. 7A, a part of the assumed first virtual quadrangle S1 and second virtual quadrangle S2 (one each) is indicated by a broken line. 8A is an optical path diagram of light incident from the first Fresnel lens portion 145a in the DD cross section shown in FIG. 7A, and FIG. 8B is a second Fresnel lens portion 145b in the DD cross section shown in FIG. 7A. It is an optical path figure of the light which injects from. 9A is a plan view of the light emitting device 100, and FIGS. 9B, 10A, and 10B are cross-sectional views taken along diagonal lines EE of the first virtual quadrangle S1 and the second virtual quadrangle S2 shown in FIG. 9A. is there. FIG. 9B is an optical path diagram of light incident from the refraction part 144, the first Fresnel lens part 145a, and the second Fresnel lens part 145b in the cross section. 10A is an optical path diagram of light incident from the first Fresnel lens portion 145a in the EE cross section shown in FIG. 9A, and FIG. 10B is a second Fresnel lens portion 145b in the EE cross section shown in FIG. 9A. It is an optical path figure of the light which injects from. 7B, FIG. 8, FIG. 9B, and FIG. 10 show only light emitted from the half surface of the light emitting surface.

  In the following description, the light exits from the exit region 142 in a cross section that passes through the optical axis LA and is parallel to one side of the first virtual quadrangle S1 (second virtual quadrangle S2), and moves away from the optical axis LA as the distance from the exit region 142 increases. The angle of the light with respect to the optical axis LA is “positive”, the light is emitted from the emission region 142, and the angle with respect to the optical axis LA of the light that approaches the optical axis LA as the distance from the emission region 142 increases is “negative”. In this case, as shown in FIG. 8A, the angle of the first emitted light L1 reflected by the first Fresnel lens portion 145a and emitted from the emission region 142 with respect to the optical axis LA is “positive” (flux control condition: 0 ° <θ1a, θ1b). That is, the first emitted light L1 reflected from the first Fresnel lens portion 145a and emitted from the emission region 142 is controlled to go to the outer peripheral portion of the irradiated region. Further, among the first emitted light L1, the emission angle (θ1a) of the first inner emission light L1a emitted most from the optical axis LA side is larger than the emission angle (θ1b) of the first outer emission light L1b emitted from the outermost side. It is controlled to be smaller. Thereby, the light incident from the first Fresnel lens portion 145a is controlled to go to the outer peripheral portion of the irradiated region.

  Further, as shown in FIG. 8B, the second outgoing light L2 reflected from the second Fresnel lens portion 145b and emitted from the outgoing region 142 has an angle with respect to the optical axis LA (LA ′) of “positive”, “0 ( (Parallel) ”and“ negative ”outgoing light (flux control condition: θ2a ≦ 0 ° ≦ θ2b). In addition, the emission angle (θ2b) of the second outer emission light L2b emitted from the outermost side of the second emission light L2 is controlled to be smaller than the emission angle (θ1b) of the first outer emission light L1b. (Flux control condition: θ2b <θ1b). Thus, the light incident from the second Fresnel lens portion 145b is controlled to go to the central portion of the irradiated region. Note that “θ2a” indicates the emission angle of the second inner emitted light L2a emitted from the innermost side of the second emitted light L2. The exit angle here means an angle of the emitted light with respect to the optical axis LA.

  Thus, in the cross section passing through the optical axis LA and parallel to one side of the first virtual quadrangle S1 (second virtual quadrangle S2), the above-described light flux control conditions (0 ° <θ1a, θ1b, θ2a ≦ 0 ° ≦ θ2b). , Θ2b <θ1b) and forming the first ridge 147 (second ridge 150) having the same shape from one end to the other end along each side of the first virtual quadrangle S1 (second virtual quadrangle S2), In the cross section including the diagonal line of the first virtual quadrangle S1 (second virtual quadrangle S2) shown in FIG. 10, the cross section is controlled so as to go to the outer peripheral direction of the irradiated region, and goes to the corner direction in the quadrangular irradiated region. It can be seen that light is generated. That is, in the cross section passing through the optical axis LA and parallel to one side of the first virtual quadrangle S1 (second virtual quadrangle S2), the first ridge 147 (second ridge 150) satisfies the light flux control condition described above. If not, a highly uniform quadrangular irradiated region cannot be obtained. In designing the first ridge 147 and the second ridge 150, light emitted from the intersection with the optical axis LA on the light emitting surface of the light emitting element 120 is used.

  FIGS. 11-14 is a figure which shows the simulation result of the illumination intensity distribution using the light-emitting device 100 which concerns on this Embodiment. FIG. 11 is a simulation result of the illuminance distribution in a case where an irradiated region 100 mm away from the light emitting surface of the light emitting element 120 is assumed. FIG. 11A is a simulation result of the illuminance distribution based on the light incident from the refraction unit 144 and the first Fresnel lens unit 145a, and FIG. 11B is a simulation result of the illuminance distribution based on the light incident from the second Fresnel lens unit 145b. 11C is a diagram in which the illuminance scale of FIG. 11B is matched with FIG. 11A, and FIG. 11D is an illuminance distribution based on light incident from the refraction part 144, the first Fresnel lens part 145a, and the second Fresnel lens part 145b. This is a simulation result.

  FIG. 12 is a simulation result of the illuminance distribution in the case of assuming an irradiated region that is 500 mm away from the light emitting surface of the light emitting element 120. FIG. 12A is a simulation result of the illuminance distribution based on the light incident from the refraction unit 144 and the first Fresnel lens unit 145a, and FIG. 12B is a simulation result of the illuminance distribution based on the light incident from the second Fresnel lens unit 145b. FIG. 12C is a diagram in which the illuminance scale of FIG. 12B is matched with FIG. 12A, and FIG. 12D is an illuminance distribution based on light incident from the refraction part 144, the first Fresnel lens part 145a, and the second Fresnel lens part 145b. This is a simulation result.

  FIG. 13 is a simulation result of the illuminance distribution in a case where an irradiated region is assumed to be 1000 mm away from the light emitting surface of the light emitting element 120. FIG. 13A is a simulation result of the illuminance distribution based on the light incident from the refraction unit 144 and the first Fresnel lens unit 145a, and FIG. 13B is a simulation result of the illuminance distribution based on the light incident from the second Fresnel lens unit 145b. FIG. 13C is a diagram in which the illuminance scale of FIG. 13B is matched with FIG. 13A, and FIG. 13D is an illuminance distribution based on light incident from the refraction part 144, the first Fresnel lens part 145a, and the second Fresnel lens part 145b. This is a simulation result.

  FIG. 14 is a simulation result of the illuminance distribution in a case where an irradiated region is assumed to be 1500 mm away from the light emitting surface of the light emitting element 120. FIG. 14A is a simulation result of the illuminance distribution based on the light incident from the refraction unit 144 and the first Fresnel lens unit 145a, and FIG. 14B is a simulation result of the illuminance distribution based on the light incident from the second Fresnel lens unit 145b. 14C is a diagram in which the illuminance scale of FIG. 14B is matched with FIG. 14A, and FIG. 14D is an illuminance distribution based on light incident from the refraction unit 144, the first Fresnel lens unit 145a, and the second Fresnel lens unit 145b. This is a simulation result.

  In addition, the vertical axis | shaft and horizontal axis in the left figure of FIGS. 11-14 have shown the distance (mm) from the optical axis LA (center axis CA of the light beam control member 140) of a light emitting element. Moreover, the vertical axis | shaft in the right figure has shown illumination intensity (lux).

  As shown in FIG. 11A, FIG. 12A, FIG. 13A, and FIG. 14A, in the light emitting device 100 having the light flux controlling member 140 according to the present embodiment, the first Fresnel is used regardless of the distance from the light emitting surface of the light emitting element 120. The light incident from the lens unit 145a illuminates the outer peripheral portion of the irradiated region. Further, as shown in FIGS. 11C, 12C, 13C, and 14C, the light incident from the second Fresnel lens portion 145b illuminates the central portion of the irradiated region. Furthermore, as shown in FIG. 11D, FIG. 12D, FIG. 13D, and FIG. 14D, in the light emitting device 100 that has the light flux controlling member 140 according to the present embodiment, regardless of the distance from the light emitting surface of the light emitting element 120, The irradiation area was rectangular.

  In this way, if the first virtual quadrangle S1 and the second virtual quadrangle S2 are square, the illuminated region having a square shape can be illuminated as in the present embodiment. That is, the shape of the first virtual quadrangle S1 and the second virtual quadrangle S2 and the shape of the irradiated region are similar. Therefore, when illuminating a rectangular irradiated region, the first virtual quadrangle S1 and the second virtual quadrangle S2 may be rectangular.

  The arrows in FIGS. 6, 11D, 12D, 13D, and 14D indicate the illuminance histograms at the four corners (darkest portions) of the irradiated region. This indicates that the four corners of the irradiated area when the light flux controlling member 140 according to the present embodiment is used are brighter than the four corners of the irradiated area when the light flux controlling member 50 of the comparative example is used. That is, the light-emitting device 100 according to the present embodiment is formed from the central portion more than the light-emitting device of the comparative example by forming the ridges that satisfy the light flux control conditions described above so as to be arranged on each side of the quadrangle. It can be seen that the illuminated region having a rectangular shape up to the outer peripheral portion is illuminated uniformly and efficiently.

[effect]
As described above, the light flux controlling member 140 according to the present embodiment controls the light distribution of the light incident from the first Fresnel lens portion 145a and the second Fresnel lens portion 145b and emitted from the emission region 142, respectively. By controlling according to conditions, it is possible to uniformly and efficiently illuminate a rectangular irradiated region.

  Note that the planar shape of the light-emitting element 120 is not particularly limited. Examples of the planar shape of the light emitting element 120 include polygonal shapes such as a circular shape and a quadrangular shape. For example, in the case of the rectangular light emitting element 120, the positional relationship between one side of the light emitting element 120 and one side of the first virtual quadrangle S1 (second virtual quadrangle S2) of the light flux controlling member 140 is not particularly limited, and is shifted by 45 °. The same effect can be obtained even when arranged.

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

  FIG. 15 is a diagram showing a configuration of lighting apparatus 400 according to the present embodiment. As illustrated in FIG. 15, the lighting device 400 may include a plurality of light emitting devices 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]
Lighting device 400 according to the present embodiment has the same effects as light flux controlling member 140 and light emitting device 100 according to the present embodiment.

[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. 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. The description will focus on new components of the light flux controlling member 240. The light flux controlling member 240 according to the second embodiment is different from the light flux controlling member 140 according to the first embodiment in that the light flux controlling member 240 according to the second embodiment further includes a wall portion 260 that separates adjacent ridges on the diagonal line of the first virtual quadrangle S1.

(Configuration of luminous flux control member)
16 to 18 are diagrams showing the configuration of the light flux controlling member 240 according to the second embodiment. 16A is a perspective view of light flux controlling member 240 according to Embodiment 2 as viewed from below, and FIG. 16B is an enlarged view of a portion indicated by a broken line in FIG. 16A. 17A is a bottom view of light flux controlling member 240 according to Embodiment 2, FIG. 17B is a side view, and FIG. 17C is a bottom view in which refractive portion 144 and Fresnel lens portion 245 are omitted. 17D is a cross-sectional view taken along line FF shown in FIG. 17A. 18A is a cross-sectional view taken along line GG shown in FIG. 17A, FIG. 18B is an enlarged view of a portion indicated by a broken line in FIG. 18A, and FIG. 18C is a cross-sectional view taken along line H-H. 18D is an enlarged view of a portion indicated by a broken line in FIG. 18C, FIG. 18E is a cross-sectional view taken along a line II, and FIG. 18F is an enlarged view of a portion indicated by a broken line in FIG. 18G is a cross-sectional view taken along line JJ, and FIG. 18H is an enlarged view of a portion indicated by a broken line in FIG. 18G.

  As shown in FIGS. 16 to 18, the light flux controlling member 240 according to the second embodiment has an incident area 241 and an exit area 142. A flange 243 is provided between the entrance region 241 and the exit region 142. The incident region 241 includes a refracting part 144 and a Fresnel lens part 245 including a first Fresnel lens part 245a and a second Fresnel lens part 145b.

  The first Fresnel lens portion 245a is assumed to be a plurality of first virtual quadrangles S1 that are similar to each other in plan view and arranged concentrically and parallel to each side, and are arranged on the four first sides. It has a ridge 247.

  Wall portions 260 are disposed on the diagonal lines of the first virtual quadrangle S1. The wall 260 has a predetermined thickness and separates the two first ridges 247 and 247 adjacent to each other in the first virtual quadrangle S1. The wall 260 is designed to have the same height as or higher than the valley of the first ridge 247 to the top of the first ridge 247. The cross-sectional shape of the wall portion 260 in the direction orthogonal to the diagonal line of the first virtual quadrangle S1 is a vertically long rectangle. Further, the wall portion 260 is continuously arranged from the first ridge 247 of the first virtual quadrangle S1 that is the innermost in plan view to the first ridge 247 of the first virtual quadrangle S1 that is the outermost. . Note that the inner end portion of the wall portion 260 may extend to the refracting portion 144.

  The wall 260 has a first convex shape as long as one end in the diagonal direction of the first virtual quadrangle S1 reaches the refraction part 144 and the other end reaches the second Fresnel lens part 145b. It may be lower than the height to the top of the strip 247 (see paragraph 0074).

  Although not particularly illustrated, the simulation result of the illuminance distribution using the light emitting device having the light flux controlling member 240 according to the second embodiment is the illuminance using the light emitting device 100 having the light flux controlling member 140 according to the first embodiment. It was the same as the simulation result of distribution.

(Configuration of mold)
Next, a forming die 270 for forming the light flux controlling member 240 according to Embodiment 2 will be described. FIGS. 19-21 is a figure which shows the structure of the shaping | molding die 270 used for shaping | molding of the light beam control member 240 which concerns on Embodiment 2. FIG. 19A is a perspective view of the first mold 272 of the mold 270 as viewed from below, FIG. 19B is an enlarged view of a portion of a circle C1 indicated by a broken line in FIG. 19A, and FIG. 19C is a broken line. It is an enlarged view of the part of circle C2 shown. 20A is a bottom view of the first mold 272, FIG. 20B is a bottom view in which the refractive part molding region and the Fresnel lens part molding region 274 are omitted, and FIG. 20C is a KK shown in FIG. 20A. FIG. 20D is an enlarged view of a portion indicated by a broken line in FIG. 20A. 21A is a cross-sectional view taken along line LL shown in FIG. 21A, FIG. 21B is an enlarged view of a portion indicated by a broken line in FIG. 21A, and FIG. 21C is a cross-sectional view taken along line MM. 21D is an enlarged view of a portion indicated by a broken line in FIG. 21C, FIG. 21E is a cross-sectional view taken along line NN, and FIG. 21F is an enlarged view of a portion indicated by a broken line in FIG. 21E. 21G is a cross-sectional view taken along the line OO, and FIG. 21H is an enlarged view of a portion indicated by a broken line in FIG. 21G.

  In general, a mold used for molding a Fresnel lens can be manufactured by lathing a circular mold to form a plurality of concentric grooves (recesses). However, as described above, the light flux controlling member 240 according to the present invention has the Fresnel lens portion 245 including the first linear protrusion 247. Therefore, the forming die 270 according to the present invention cannot form the concave stripe corresponding to the first convex stripe 247 by lathe processing. Moreover, when two adjacent ridges are connected to each other, it is difficult to form corners by the grooves by machining. Even if a groove corresponding to the first protrusion 247 can be formed, bubbles may remain at the boundary between the groove and the adjacent groove during injection molding.

  In order to solve such a problem, in the forming die 270 for forming the light flux controlling member 240 according to the present embodiment, the groove portion 280 is disposed at the boundary portion between the adjacent first concave stripes 277.

  As shown in FIGS. 19 to 21, the molding die 270 is configured to mold a first mold 272 for molding a portion on the incident region 241 side of the light flux controlling member 240 and a portion on the emitting region 142 side. A second mold (not shown).

  The first mold 272 has a shape corresponding to the shape of the light flux controlling member 240 on the incident region 241 side. The first mold 272 has a refractive part molding region 273 for molding the refractive part 144 and a Fresnel lens part molding region 274 for molding the Fresnel lens part 245. The Fresnel lens part molding region 274 has a plurality of concave stripes arranged on each side of a plurality of virtual quadrangles that are similar to each other in plan view and are arranged concentrically and parallel to each side. On each diagonal line of the virtual quadrangle, a groove portion is disposed that separates the concave line disposed on one side of the virtual quadrangle and the concave line disposed on the other side adjacent to the one side in the virtual quadrangle. ing. More specifically, the Fresnel lens portion molding region 274 is positioned outside the first Fresnel lens portion molding region 275 for molding the first Fresnel lens portion 145a and the first Fresnel lens portion molding region. And a second Fresnel lens part molding region 276 for molding the two Fresnel lens part 145b.

  The first Fresnel lens part molding region 275 corresponds to the plurality of first virtual quadrangles S1 and is similar to each other in a plan view, and is formed of a plurality of first virtual quadrangles S1 ′ arranged so as to be concentric and parallel to each side. A plurality of first concave stripes 277 are arranged on each side. The first virtual quadrangle S1 'corresponds to the above-described virtual quadrangle, and the first concave stripe 277 corresponds to the above-described concave stripe. A groove 280 is disposed on each diagonal line of the first virtual quadrangle S1 '.

  The second Fresnel lens part molding region 276 is similar to the first virtual quadrangle S1 ′ in plan view, corresponding to one or more of the first virtual quadrangle S1 ′, and concentric with the first virtual quadrangle S1 ′. It has a plurality of second concave stripes 278 arranged on each side of one or two or more second virtual quadrilaterals S2 ′ arranged so that each side is parallel. The second virtual quadrangle S2 'corresponds to the virtual quadrangle described above, and the second concave strip 278 corresponds to the concave strip described above.

  The groove portion 280 functions as a gas escape passage for the cavity during injection molding to be described later. The groove portion 280 has a predetermined depth, and separates the two first recesses 277, 277 adjacent to each other in the first virtual quadrangle S1 '. The groove 280 is formed to have the same depth as or deeper than the top of the first groove 277 to the valley of the first groove 277. Further, the groove portion 280 is continuously arranged from the first concave stripe 277 of the first virtual quadrilateral S1 ′ that is the innermost in plan view to the first concave stripe 277 of the first virtual quadrilateral S1 ′ that is the outermost. Yes. That is, the groove part 280 should just be arrange | positioned in the 1st Fresnel lens part shaping | molding area | region 275 at least. In addition, the inner side edge part of the groove part 280 may be extended to the refractive part shaping | molding area | region 273.

  The second mold (not shown) has a shape corresponding to the shape of the light flux controlling member 240 on the emission region 142 side. The second mold is clamped with the first mold 272 to form a cavity having the shape of the light flux controlling member 240.

  As described above, the light flux controlling member 240 can be manufactured by injection molding. The injection molding includes a mold clamping process for clamping the mold 270 (the first mold 272 and the second mold), a filling process for filling the inside (cavity) of the mold 270 with a molten resin, and a mold. 270 includes a pressure-holding step of naturally cooling while holding pressure in a state where the molten resin is filled in 270, and a mold-opening step of opening the mold 270 that has been clamped.

  As described above, since the groove 280 only needs to function as a gas venting passage in the filling process at the time of injection molding, the depth of the groove 280 is not necessarily the depth from the top of the first recess 277 to the valley. There is no need to match. Therefore, in the light flux controlling member 240, the wall portion 260 only needs to be continuously formed so as to connect the refracting portion 144 and the second Fresnel lens portion 145b. Further, it is not necessary for the molten resin to completely flow in the filling step. Moreover, the shape of the groove part 280 will not be specifically limited if the gas in a cavity escapes in a filling process.

  Furthermore, since the groove part 280 should just function as a channel | path for degassing, the number of the groove parts 280 may be one and may be 2-4. When there is one groove 280, the groove 280 may or may not be formed on the opposite side with respect to the gate filled with the molten resin.

(effect)
Light flux controlling member 240 according to the present embodiment has the same effect as light flux controlling member 140 according to the first embodiment. Further, the light emitting device and the lighting device according to the present embodiment have the same effects as the light emitting device 100 and the lighting device 400 according to the first embodiment.

  Since the molding die 270 according to the present embodiment has the gas vent groove 280, it is possible to suppress the occurrence of molding defects due to air bubbles and improve the manufacturing yield. Further, in the molding die 270 according to the present embodiment, the adjacent linear first concave strips 277 and 277 are separated from each other, and it is not necessary to connect the first concave strips 277 in a rectangular shape, and the rectangular corners are formed. Since it is not formed, the Fresnel lens part molding region 274 can be easily formed by machining.

  The first mold 272 may be divided into four on a plane including the diagonal line of the first virtual quadrangle S1 'and the central axis CA. In this case, when the first mold 272 is assembled, it is possible to prevent the end surfaces of the first concave strips 277 from colliding with each other due to the groove portion 280, so that the assembly operation can be facilitated.

[Embodiment 3]
(Configuration of luminous flux control member)
The light emitting device and the lighting device of the third embodiment are different from the light emitting device and the lighting device of the second embodiment in the shape of the light flux control member 340. Therefore, the same components as those of the light-emitting device 100 and the illumination device 400 according to Embodiment 2 are denoted by the same reference numerals, and the description thereof is omitted. The description will focus on new components of the light flux controlling member 340. The light flux controlling member 340 according to the third embodiment is different from the light flux controlling member 240 according to the second embodiment in the cross-sectional shape of the wall portion.

  22-24 is a figure which shows the structure of the light beam control member 340 which concerns on Embodiment 3. FIG. 22A is a perspective view of light flux controlling member 340 according to Embodiment 3 as seen from below, and FIG. 22B is an enlarged view of a portion indicated by a broken line in FIG. 22A. 23A is a bottom view of the light flux controlling member 340 according to Embodiment 3, FIG. 23B is a side view, and FIG. 23C is a bottom view in which the refraction part 144 and the Fresnel lens part 345 are omitted. 23D is a cross-sectional view taken along the line PP shown in FIG. 23A. 24A is a cross-sectional view taken along line Q-Q shown in FIG. 23A, FIG. 24B is an enlarged view of a portion indicated by a broken line in FIG. 24A, and FIG. 24C is a cross-sectional view taken along line RR. 24D is an enlarged view of a portion indicated by a broken line in FIG. 24C, FIG. 24E is a cross-sectional view taken along line SS, and FIG. 24F is an enlarged view of a portion indicated by a broken line in FIG. 24E. 24G is a cross-sectional view taken along line TT, and FIG. 24H is an enlarged view of a portion indicated by a broken line in FIG. 24G.

  As shown in FIGS. 22 to 24, the light flux controlling member 340 according to the third embodiment has an incident area 341 and an exit area 142. A flange 243 is provided between the entrance region 341 and the exit region 142. In addition, the incident region 341 includes a refracting portion 144 and a Fresnel lens portion 345 including a first Fresnel lens portion 345a and a second Fresnel lens portion 145b.

  The first Fresnel lens part 345a is assumed to be a plurality of first virtual quadrangles S1 that are similar to each other in plan view and are arranged so as to be concentric and parallel to each other. A protrusion 347 is provided.

  A wall portion 360 is disposed on each diagonal line of the first virtual quadrangle S1. The wall 360 has a predetermined thickness, and separates the two first ridges 347 and 347 adjacent to each other in the first virtual quadrangle S1. The wall 360 is designed to have the same height as or higher than the valley of the first ridge 347 to the top of the first ridge 347. The cross-sectional shape of the wall 360 in the direction orthogonal to the diagonal line of the first virtual quadrangle S1 is a vertically long isosceles triangle. Moreover, the wall part 360 is continuously arrange | positioned from the 1st protruding item | line 347 of 1st virtual quadrangle | tetragon S1 located in the innermost side in planar view to the 1st protruding item | line 347 of 1st virtual quadrilateral S1 located in the outermost side. . Note that the inner end portion of the wall portion 360 may extend to the refracting portion 144. The height of the wall 360 in the light flux controlling member 340 of the third embodiment may not be the same height from the valley to the top of the first ridge 347.

  Although not particularly illustrated, the simulation result of the illuminance distribution using the light emitting device having the light flux controlling member 340 according to the third embodiment is the illuminance using the light emitting device 100 having the light flux controlling member 140 according to the first embodiment. It was the same as the simulation result of distribution.

(Configuration of mold)
Next, a forming die 370 for forming the light flux controlling member 340 according to Embodiment 3 will be described. FIGS. 25 to 27 are diagrams showing the configuration of a molding die 370 used for molding the light flux controlling member 340 according to the third embodiment. 25A is a perspective view of the first mold 372 of the mold 370 as viewed from below, FIG. 25B is an enlarged view of a portion of a circle C3 indicated by a broken line in FIG. 25A, and FIG. It is an enlarged view of the portion of circle C4. 26A is a bottom view of the first mold 372, FIG. 26B is a bottom view in which the refractive part molding region and the Fresnel lens part molding region 274 are omitted, and FIG. 26C is a U-U shown in FIG. 26A. FIG. 26D is an enlarged view of a portion indicated by a broken line in FIG. 26A. 27A is a cross-sectional view taken along line VV shown in FIG. 26A, FIG. 27B is an enlarged view of a portion indicated by a broken line in FIG. 27A, and FIG. 27C is a cross-sectional view taken along line WW. 27D is an enlarged view of a portion indicated by a broken line in FIG. 27C, FIG. 27E is a sectional view taken along line XX, and FIG. 27F is an enlarged view of a portion indicated by a broken line in FIG. 27E. 27G is a cross-sectional view taken along line YY, and FIG. 27H is an enlarged view of a portion indicated by a broken line in FIG. 27G.

  As shown in FIGS. 25 to 27, the mold 370 includes a first mold 372 that molds the incident area 341 side and a second mold (not shown) that molds the emission area 142 side.

  The first mold 372 has a shape corresponding to the shape on the incident region 341 side. The first mold 372 has a refractive part molding region 273 for molding the refractive part 144 and a Fresnel lens part molding region 374 for molding the Fresnel lens part 345. The Fresnel lens portion molding region 374 is located outside the first Fresnel lens portion molding region 375 for molding the first Fresnel lens portion 345a and the first Fresnel lens portion molding region 375, and the second Fresnel lens portion 145b is arranged. And a second Fresnel lens part molding region 276 for molding. A plurality of first virtual rectangles S1 corresponding to the plurality of first virtual rectangles S1 are similar to each other in a plan view and are arranged on each side of the plurality of first virtual rectangles S1 ′ arranged concentrically and parallel to each side. One recess 377 is provided. A groove 380 is disposed on each diagonal line of the first virtual quadrangle S1 '.

  The groove 380 separates the two first concave strips 377 and 377 adjacent to each other in the first virtual quadrangle S1 '. The cross-sectional shape of the groove 380 in the direction orthogonal to the diagonal line of the first virtual quadrangle S1 'is a vertically long isosceles triangle. The depth to the deepest part of the groove part 380 is the same as or deeper than the depth from the top part to the valley part of the first recess 377. Further, the groove 780 is continuously arranged from the first concave 377 of the first virtual quadrilateral S1 ′ that is the innermost in plan view to the first concave 377 of the first virtual quadrilateral S1 ′ that is the outermost. Yes. In other words, the groove 380 only needs to be disposed in at least the first Fresnel lens part molding region 375. In addition, the inner side edge part of the groove part 380 may be extended to the refractive part shaping | molding area | region 273.

(effect)
Light flux controlling member 340 according to the present embodiment has the same effect as light flux controlling member 240 according to the second embodiment. Further, the light emitting device and the lighting device according to the present embodiment have the same effects as the light emitting device and the lighting device according to the second embodiment.

  The light flux controlling member, the light emitting device, and the illuminating device according to the present invention can illuminate a quadrangular irradiated region uniformly and efficiently. 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 10,100 Light-emitting device 20,440 Substrate 21 Light source substrate 30 Light source 40 Fresnel lens 41 Refraction type Fresnel lens part 42 Reflection type Fresnel lens part 43, 141, 241, 341 Incident area 44, 142 Emission area 45 Incident surface 46 Emission surface 50, 140, 240, 340 Luminous flux control member 60 Convex part 120 Light emitting element 143, 243 Flange 144 Refraction part 145, 245, 345 Fresnel lens part 145a, 245a, 345a First Fresnel lens part 145b Second Fresnel lens part 147, 247 , 347 First convex line 148 First inclined surface 149 Second inclined surface 150 Second convex line 151 Third inclined surface 152 Fourth inclined surface 260, 360 Wall portion 270, 370 Mold 272, 372 First mold 273 Refraction Part molding area 274, 374 Fresnel Molding area 275,375 First Fresnel lens molding area 276 Second Fresnel lens molding area 277,377 First concave 278 Second concave 280,380 Groove 400 Illuminating device 420 Cover CA Central axis LA Optical axis S1 First virtual quadrangle S1 'First virtual quadrangle S2 Second virtual quadrangle S2' Second virtual quadrangle

Claims (10)

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 exit region that emits light incident from the entrance region, and
The incident area is
A refracting portion that intersects with the optical axis of the light emitting element, causes a part of the light emitted from the light emitting element to enter, and refracts the incident light toward the emission region;
A Fresnel lens part located outside the refractive part;
Have
The Fresnel lens unit includes an incident surface on which a part of the light emitted from the light emitting element is incident, and a reflective surface that is formed in a pair with the incident surface and reflects the incident light toward the emission region. Including multiple ridges,
The plurality of ridges are arranged on each side of a plurality of virtual quadrangles that are similar to each other in plan view and are arranged concentrically and parallel to each side ,
On each diagonal line of the virtual quadrangle, the ridges arranged on one side of the virtual quadrangle and the ridges arranged on the other side adjacent to the one side in the virtual quadrangle are separated. The wall is located ,
Luminous flux control member. The Fresnel lens part has a first Fresnel lens part located on the refraction part side and a second Fresnel lens part located outside the first Fresnel lens part,
The virtual quadrilateral belonging to the first Fresnel lens portion is a first virtual quadrangle, the convex strips arranged on each side of the first virtual quadrangle are first convex strips, and belong to the second Fresnel lens portion When the virtual quadrangle is a second virtual quadrangle, and the ridges arranged on each side of the second virtual quadrangle are second ridges,
The first Fresnel lens portion includes a plurality of the first ridges arranged on each side of the plurality of the first virtual rectangles,
The second Fresnel lens part includes a plurality of second ridges arranged on each side of one or more of the second virtual quadrilaterals,
The wall portion is disposed at least on the first Fresnel lens portion,
The light flux controlling member according to claim 1 . The Fresnel lens part has a first Fresnel lens part located on the refraction part side and a second Fresnel lens part located outside the first Fresnel lens part,
The virtual quadrilateral belonging to the first Fresnel lens portion is a first virtual quadrangle, the convex strips arranged on each side of the first virtual quadrangle are first convex strips, and belong to the second Fresnel lens portion When the virtual quadrangle is a second virtual quadrangle, and the ridges arranged on each side of the second virtual quadrangle are second ridges,
The first Fresnel lens portion includes a plurality of the first ridges arranged on each side of the plurality of the first virtual rectangles,
The second Fresnel lens part includes a plurality of second ridges arranged on each side of one or more of the second virtual quadrilaterals,
In a cross section passing through the optical axis and parallel to one side of the first imaginary quadrilateral, the angle of the light, which is emitted from the emission region and leaves the optical axis with distance from the emission region, is “positive”. In the case where the angle with respect to the optical axis of the light exiting from the exit area and approaching the optical axis as moving away from the exit area is `` negative '',
The first Fresnel lens part is formed such that an angle of the first emitted light emitted from the emission region via the first Fresnel lens part with respect to the optical axis is “positive”;
The second Fresnel lens portion is formed so as to include light parallel to the optical axis in the second emitted light emitted from the emission region via the second Fresnel lens portion.
The light flux controlling member according to claim 1. In the cross section, of the second emitted light, the angle of the second outer emitted light emitted from the outermost side of the emission region with respect to the optical axis with respect to the optical axis is the light of the first emitted light. The light flux controlling member according to claim 3 , wherein the light flux controlling member is smaller than an angle of the first outer outgoing light emitted from the outermost side of the outgoing region with respect to the axis with respect to the optical axis. The light flux controlling member according to any one of claims 2 to 4 , wherein the plurality of the first virtual quadrangle and the second virtual quadrangle are squares. A light emitting element;
The light flux controlling member according to any one of claims 1 to 5 ,
A light emitting device. A light emitting device according to claim 6 ;
A cover that diffuses and transmits light emitted from the light emitting device;
A lighting device. A molding die for molding the light flux controlling member according to any one of claims 1 to 5 ,
Having a Fresnel lens part molding region for molding the Fresnel lens part;
The Fresnel lens part molding region is similar to each other in a plan view, and has a plurality of concave stripes arranged on each side of a plurality of virtual quadrangles arranged concentrically and parallel to each side,
On each diagonal line of the virtual quadrangle, the concave stripes arranged on one side of the virtual quadrangle and the concave stripes arranged on another side adjacent to the one side in the virtual quadrangle are separated. The groove is arranged,
Mold. The mold according to claim 8 , wherein a depth of the groove is deeper than a depth from a top of the groove to a valley of the groove. The Fresnel lens part molding area has a first Fresnel lens part molding area and a second Fresnel lens part molding area located outside the first Fresnel lens part molding area,
The virtual quadrangle belonging to the first Fresnel lens part molding region is a first virtual quadrangle, the concaves arranged on each side of the first virtual quadrangle are first concaves, and the second Fresnel lens part When the virtual quadrilateral belonging to the molding region is a second virtual quadrangle, and the concave line disposed on each side of the second virtual quadrangle is a second concave line,
The first Fresnel lens part molding region includes a plurality of the first concave stripes arranged on each side of the plurality of the first virtual squares,
The second Fresnel lens part molding region includes a plurality of the second concave stripes arranged on each side of one or more of the second virtual quadrangle,
The groove is disposed at least in the first Fresnel lens part molding region,
The mold according to claim 8 or 9 .