WO2014073158A1 - Luminous flux control member, light emitting device, illumination device and molding die - Google Patents

Abstract

A luminous flux control member (140) according to the present invention comprises: an incident region (141) on which the light emitted from a light emitting element (120) is incident; and an emission region (142) for emitting the light incident from the incident region (141). The incident region (141) comprises a refractive part (144) and a Fresnel lens part (145) located outside the refractive part (144). The Fresnel lens part (145) has a plurality of projected stripes arranged on each side of a plurality of virtual squares, the virtual squares being mutually similar and concentric with the respective sides thereof arranged parallel to each other.

Description

Light flux control member, light emitting device, lighting device and mold

The present invention relates to a light flux controlling member for controlling the light distribution of light emitted from a light emitting element, a light emitting device and an illuminating device having the light flux controlling member, and a mold for molding the light flux controlling member.

In recent years, from the viewpoint of energy saving and miniaturization, a light emitting device (LED flash) having a light emitting diode (hereinafter also referred to as "LED") as a light source has come to be 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 (see, for example, Patent Document 1).

FIG. 1A is a cross-sectional view of a light emitting device described in Patent Document 1. As shown in FIG. 1A, a 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, on one surface of the Fresnel lens 40, a refractive Fresnel lens portion 41 and a reflective Fresnel lens portion 42 are formed. Each of the refractive Fresnel lens portion 41 and the reflective Fresnel lens portion 42 has a plurality of annular projections arranged concentrically. The refractive Fresnel lens unit 41 is formed at a position facing the light source 30. The reflective Fresnel lens unit 42 is formed around the refractive Fresnel lens unit 41 so as to surround the light source 30. 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 an incident area 43, and the surface on the opposite side of the incident area 43 functions as an output area 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 unit 41 and 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 enters from the incident surface 45 of the reflective Fresnel lens unit 42, is reflected by the reflective surface 46 in a predetermined direction, and is emitted from the emission region 44 Ru. As described above, the light emitting device 10 described in Patent Document 1 controls the light distribution of light emitted from the light source 30 using the Fresnel lens 40 having the refractive Fresnel lens portion 41 and the reflective Fresnel lens portion 42. ing.

JP, 2011-192494, A

Generally, the shape of the imaging area of the imaging camera is a square. Therefore, in order to obtain a clear captured image, the light emitting device preferably illuminates the irradiated region in a square shape. However, when light is irradiated to a square-shaped irradiation area using the Fresnel lens of Patent Document 1, the four corners of the irradiation area may be dark. Moreover, when it is going to irradiate light fully to four corners of a field to be irradiated, since it is necessary to spread light, useless light will be generated. As described above, when the Fresnel lens of Patent Document 1 is used, it is not possible to uniformly and efficiently irradiate the light emitted from the light emitting element to the quadrangular irradiated area.

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 to a square-shaped irradiation region. Another object of the present invention is to provide a light emitting device and a lighting device having the light flux controlling member, and a mold for molding the light flux controlling member.

The light flux controlling member according to the present invention is a light flux controlling member for controlling the light distribution of light emitted from the light emitting element, and includes an incident area to which light emitted from the light emitting element is incident, and light incident from the incident area. An emission area for emitting light, the incident area intersects the optical axis of the light emitting element, and a part of the light emitted from the light emitting element is made incident, and the incident light is directed to the emission area The light emitting device further includes a refracting portion that refracts light and a Fresnel lens portion positioned outside the refracting portion, and the Fresnel lens portion includes an incident surface on which a part of light emitted from the light emitting element is incident, and the incident surface And a plurality of ridges formed in pairs and having a reflection surface for reflecting incident light toward the emission region, the plurality of ridges being similar to each other in plan view, concentric, and each side being parallel Arranged to be They are arranged on respective sides of the number of virtual rectangle.

The light emitting device of the present invention has a light emitting element and the light flux controlling member of the present invention.

The lighting device of the present invention includes the light emitting device of the present invention and a cover that diffuses and transmits the light emitted from the 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 portion molding region for molding the Fresnel lens portion, and the Fresnel lens portion molding region is It has a plurality of concave streaks arranged on each side of a plurality of virtual quadrangles which are similar to each other in plan view and are arranged concentrically and parallel to each side, and on each diagonal of the virtual quadrilateral, A groove portion is disposed which separates the groove arranged on one side of the virtual quadrangle and the groove arranged on the other side adjacent to the side in the virtual square.

According to the light emitting device having the light flux controlling member of the present invention, the light emitted from the light emitting element can be uniformly and efficiently irradiated to the rectangular light receiving region. Moreover, the illumination device of the present invention can illuminate light in a square-shaped irradiation area uniformly and efficiently.

FIGS. 1A and 1B are diagrams showing the configuration of the light emitting device described in Patent Document 1. FIG. FIG. 1 is a cross-sectional view of a light emitting device according to Embodiment 1. 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 the configuration of the light flux controlling member of the comparative example. 6A to 6D are diagrams showing 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 of the light emitting device according to the first embodiment. 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 the first embodiment. 11A to 11D are diagrams showing simulation results of illuminance distribution using the light emitting device according to the first embodiment. 12A to 12D are diagrams showing simulation results of illuminance distribution using the light emitting device according to the first embodiment. 13A to 13D are diagrams showing simulation results of illuminance distribution using the light emitting device according to the first embodiment. 14A to 14D are diagrams showing simulation results of illuminance distribution using the light emitting device according to the first embodiment. FIG. 1 is a diagram showing a configuration of a lighting device according to Embodiment 1. 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 a light flux controlling member according to Embodiment 2. FIG. 18A to 18H are cross-sectional views of a light flux controlling member according to the second embodiment. 19A to 19C are diagrams showing the configuration of a forming die used for forming the light flux controlling member according to the second embodiment. 20A to 20D are diagrams showing the configuration of a forming die used for forming the light flux controlling member according to the second embodiment. 21A to 21H are cross-sectional views of a forming die used for forming the light flux controlling member according to the second embodiment. 22A and 22B are diagrams showing the configuration of a light flux controlling member according to Embodiment 3. FIG. 23A to 23D are diagrams showing the configuration of a light flux controlling member according to Embodiment 3. FIG. 24A to 24H are cross-sectional views of a light flux controlling member according to the third embodiment. 25A to 25C are diagrams showing a configuration of a forming die used for forming the light flux controlling member according to the third embodiment. 26A to 26C are diagrams showing the configuration of a forming die used for forming the light flux controlling member according to the third embodiment. FIGS. 27A to 27H are cross-sectional views of a forming die used to form 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.

First Embodiment
(Configuration of luminous flux control member and light emitting device)
FIG. 2 is a cross-sectional view of the 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 control member 140. The light emitting element 120 is, for example, 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 such that its central axis CA coincides with the optical axis LA of the light emitting element 120.

The light flux control member 140 may be formed by injection molding. The material of the light flux controlling member 140 is not particularly limited as long as it can pass light of a desired wavelength. For example, the material of the light flux controlling member 140 is a light transmitting resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), epoxy resin (EP), or glass.

3 and 4 are diagrams showing the configuration of the 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 omitting the refracting portion 144 and the Fresnel lens portion 145. is there. 4A is a cross-sectional view taken along the line AA shown in FIG. 3C, FIG. 4B is a cross-sectional view taken along the line BB, and FIG. 4C is an enlarged view of a dashed line shown in FIG. 4B.

As shown in FIG. 3 and FIG. 4, the light flux controlling member 140 is located on the side opposite to 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 area 142 for emitting light. A flange 143 may be provided between the incident area 141 and the outgoing area 142.

The plan view shape of the light flux controlling member 140 is not particularly limited. The plan view shape of light flux controlling member 140 of the present embodiment is a rectangle (more specifically, a square).

The incident region 141 allows the light emitted from the light emitting element 120 to be incident. The incident area 141 has a refracting portion 144 located in the central portion of the incident area 141 and a Fresnel lens portion 145 located 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 into the light flux controlling member 140, and the incident light to the emitting area 142. Refraction towards. The refracting portion 144 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). In addition, the shape of the refraction | bending part 144 will not be specifically limited if the said function can be exhibited. For example, the shape of the refractive portion 144 may be spherical or aspheric, or may be a refractive Fresnel lens. The shape of the refracting portion 144 in the present embodiment is a quadrangular pyramid.

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

More specifically, the Fresnel lens unit 145 includes a first Fresnel lens unit 145 a located on the refractive unit 144 side and a second Fresnel lens unit 145 b located outside the first Fresnel lens unit 145 a. As described later, the light incident from the refracting portion 144 and the second Fresnel lens portion 145 b mainly illuminates the central portion of the quadrangular irradiated region. On the other hand, the light incident from the first Fresnel lens portion 145 a mainly illuminates the outer peripheral portion of the square shaped irradiated region.

The first Fresnel lens portion 145a causes a part of the light emitted from the light emitting element 120 (the light emitted at a slightly large angle with respect to the optical axis LA) to enter into the light flux controlling member 140, and the incident light The light is reflected toward the exit area 142 (see FIG. 8A). The first Fresnel lens portions 145a assume a plurality of first virtual quadrilaterals S1 (see FIG. 3D) which are arranged so as to be similar to each other in plan view and concentric and parallel to each other. And a plurality of first ridges 147 disposed on each side of. The first virtual quadrilateral S1 corresponds to the above-described virtual quadrilateral, and the first ridge 147 corresponds to the above-described ridge. The shape of the first virtual quadrilateral S1 is not particularly limited. The shape of the first virtual quadrilateral 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 are in contact with the first ridges 147 arranged on the other side adjacent to the first virtual quadrilateral S1 to which each belongs. It may be good or separated. Usually, the first ridges 147 disposed on any one side of the first virtual quadrangle S1 are formed in the same shape from one end to the other end. Furthermore, the shapes of the four first ridges 147 disposed on the four sides of the first virtual quadrangle S1 are also 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 ridges 147 are a first inclined surface 148 which is an incident surface to which light emitted from the light emitting element 120 is incident, and a reflective surface which reflects the light incident from the first inclined surface 148 toward the emission region 142 And a second inclined surface 149. In each of the first ridges 147, the first inclined surface 148 is located on the inner side (central axis CA side), and the second inclined surface 149 is located on the outer side. Moreover, in each of the first ridges 147, the first inclined surface 148 and the second inclined surface 149 may be continuous or discontinuous. In the former case, a ridge 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, manufacturability can be improved by eliminating the acute angle portion (ridge line portion).

In the cross section including central axis CA, 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 light incident from the first inclined surface 148 can be refracted to the second inclined surface 149 side. It can be set appropriately according to the position and the like. In the case where the first inclined surface 148 is a curved line in a cross section including the central axis CA, the “angle of the first inclined surface 148” refers to the angle of the tangent of the first inclined surface 148 at the light incident point.

In the cross section including central axis CA, second inclined surface 149 may be straight or curved. 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. It is not particularly limited as long as it can be reflected. In the case where the second inclined surface 149 is a curved line in a cross section including the central axis CA, the “angle of the second inclined surface 149” refers to the angle of the tangent of the second inclined surface 149 at the light incident point.

The second Fresnel lens portion 145 b causes a part of the light emitted from the light emitting element 120 (the light emitted at a large angle with respect to the optical axis LA) to enter into the light flux controlling member 140 and emits the incident light. It is reflected toward the area 142 (see FIG. 8D). The second Fresnel lens unit 145b is similar to the first virtual quadrilateral S1 in plan view, and has one or more second virtual quadrilaterals S2 concentric with the first virtual quadrilateral S1 and arranged parallel to each side. It assumes and has a plurality of 2nd convex stripes 150 arranged on the four sides. The second virtual quadrilateral S2 corresponds to the above-described virtual quadrilateral, and the second ridge 150 corresponds to the above-described ridge. In the present embodiment, the case is shown in which four second ridges 150 are disposed on the four sides of one second virtual quadrangle S2.

The second ridges 150 disposed on one side of the second virtual quadrilateral S2 may be in contact with the second ridges 150 disposed on the other side adjacent to the second virtual quadrilateral S2, or may be separated. It may be done. Usually, the second ridges 150 disposed on any one side of the second virtual quadrangle S2 are formed in the same shape from one end to the other end. Furthermore, the shapes of the four second ridges 150 disposed on the four sides of the second virtual quadrangle S2 are also the same. The size of the second ridge 150 in a second virtual quadrilateral S2 and the size of the second ridge 150 in another second virtual quadrilateral S2 may be the same or different. In addition, the second convex 150 is formed larger than the refracting portion 144 and the first Fresnel lens portion 145a from the viewpoint of entering the light in the lateral direction which is not incident from the refracting portion 144 and the first Fresnel lens portion 145a. Is preferred.

The second ridges 150 are a third inclined surface 151 which is an incident surface to which light emitted from the light emitting element 120 is incident, and a reflection surface which reflects the light incident from the third inclined surface 151 toward the emission region 142 And a fourth inclined surface 152. The third inclined surface 151 is located inside (the center axis CA side), and the fourth inclined surface 152 is located outside. Further, the third inclined surface 151 and the fourth inclined surface 152 may be continuous or discontinuous. In the former case, a ridgeline 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, manufacturability can be improved by eliminating the acute angle part (ridge line part).

In the cross section including central axis CA, 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 toward the fourth inclined surface 152 side. It can be set appropriately according to the position and the like. In the case where the third inclined surface 151 is a curved line in a cross section including the central axis CA, the “angle of the third inclined surface 151” refers to the angle of the tangent of the third inclined surface 151 at the light incident point.

In the cross section including central axis CA, 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 side of the emission region 142 so that the light emitted from the emission region 142 is directed to the central portion of the irradiated region. It is not particularly limited as long as it can be reflected. In the case where the fourth inclined surface 152 is a curved line in a cross section including the central axis CA, the “angle of the fourth inclined surface 152” means the angle of the tangent 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, simulation of the optical path of the light emitted from the light emitting element 120 and simulation of the illuminance distribution were performed. Further, for comparison, also in the light emitting device having the light flux controlling member 50 shown in FIG. 5, simulation of the light path of light emitted from the light emitting element and simulation of the illuminance distribution were performed.

FIG. 5A is a plan view of the light flux controlling member 50 of the comparative example, FIG. 5B is a cross-sectional view of the 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 relates to the present embodiment in that it has a circular shape in plan view and a plurality of annular convex portions 60 arranged concentrically. It differs from the light flux control member 140.

FIG. 6 is a diagram showing simulation results 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 the irradiated region 500 mm away from the light emitting surface of the light emitting device 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 separated from the light emitting surface of the light emitting element by 1000 mm, and FIG. 6D is 1500 mm away from the light emitting surface of the light emitting element It is a simulation result of illumination distribution at the time of assuming a field to be irradiated. The vertical and horizontal axes in the left views of FIGS. 6A to 6D indicate the distance (mm) from the light axis LA of the light emitting element (the central axis CA of the light flux controlling member 50). Further, the vertical axis in the right figure indicates the illuminance (lux).

As shown in FIGS. 6A to 6D, in the light emitting device having the light flux controlling member 50 of the comparative example, the outline of the illuminance distribution in the irradiated region is 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-sectional views taken along line DD parallel to one side of the first virtual quadrilateral S1 and the second virtual quadrilateral S2 shown in FIG. 7A. FIG. FIG. 7B is an optical path diagram of light incident from the refractive portion 144, the first Fresnel lens portion 145a, and the second Fresnel lens portion 145b in the cross section. In FIG. 7A, portions (one each) of the assumed first virtual quadrangle S1 and the second virtual quadrangle S2 are indicated by broken lines. 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. FIG. 9A is a plan view of the light emitting device 100, and FIGS. 9B, 10A, and 10B are cross-sectional views of the first virtual quadrangle S1 and the second virtual quadrangle S2 shown in FIG. is there. FIG. 9B is an optical path diagram of light incident from the refracting portion 144, the first Fresnel lens portion 145a, and the second Fresnel lens portion 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 the light emitted from one half of the light emitting surface.

In the following description, in a cross section parallel to one side of the first virtual quadrangle S1 (second virtual quadrangle S2) passing through the optical axis LA, the light is emitted from the emission area 142 and is separated from the optical axis LA as it is separated from the emission area 142 The angle of the light with respect to the optical axis LA is "positive", and the angle of the light which is emitted from the emission area 142 and approaches the optical axis LA as it leaves the emission area 142 is "negative". In this case, as shown in FIG. 8A, the angle with respect to the optical axis LA of the first outgoing light L1 reflected by the first Fresnel lens portion 145a and emitted from the outgoing area 142 is “positive” (light flux control condition: 0 ° <θ1a, θ1b). That is, the first outgoing light L1 reflected by the first Fresnel lens portion 145a and emitted from the outgoing area 142 is controlled to be directed to the outer peripheral portion of the illuminated area. Further, of the first emission light L1, the emission angle (θ1a) of the first inner emission light L1a emitted most from the optical axis LA side is from the emission angle (θ1b) of the first outer emission light L1b emitted from the outermost side. It is controlled to be smaller. Thus, the light incident from the first Fresnel lens portion 145a is controlled to be directed to the outer peripheral portion of the illuminated area.

Further, as shown in FIG. 8B, the second emission light L2 reflected by the second Fresnel lens portion 145b and emitted from the emission region 142 has a positive angle with respect to the optical axis LA (LA ′), “0 (zero) Parallel) and “negative” output light (light flux control condition: θ2a ≦ 0 ° ≦ θ2b). In addition, the emission angle (θ 2 b) of the second outer emission light L 2 b emitted from the outermost side of the second emission light L 2 is controlled to be smaller than the emission angle (θ 1 b) of the first outer emission light L 1 b (Light flux control condition: θ2b <θ1b). Thus, light incident from the second Fresnel lens portion 145 b is controlled to be directed to the central portion of the illuminated area. Note that “θ2a” indicates the emission angle of the second inner emission light L2a emitted from the innermost portion of the second emission light L2. The emission angle here means an angle with respect to the optical axis LA of the emitted light.

Thus, in the cross section parallel to one side of the first virtual quadrilateral S1 (the second virtual quadrilateral S2) passing through the optical axis LA, the above-described light flux control conditions (0 ° <θ1a, θ1b, θ2a ≦ 0 ° ≦ θ2b , Θ2b <θ1b), and forming a first convex strip 147 (second convex strip 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 of the first virtual quadrilateral S1 (second virtual quadrilateral S2) shown in FIG. 10, the control is performed toward the outer peripheral direction of the irradiated area, and is directed to the corner direction in the rectangular irradiated area. It can be seen that light is being generated. That is, in a cross section parallel to one side of the first virtual quadrangle S1 (second virtual quadrangle S2) passing through the optical axis LA, the first convex streak 147 (second convex streak 150) satisfies the above-described light flux control condition If not, it is not possible to obtain a highly uniform square irradiated area. Note that, in the design of the first ridge 147 and the second ridge 150, light emitted from an intersection with the light axis LA on the light emitting surface of the light emitting element 120 is used.

11 to 14 are diagrams showing simulation results of illuminance distribution using the light emitting device 100 according to the present embodiment. FIG. 11 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 120. FIG. 11A is a simulation result of illuminance distribution based on light incident from the refracting portion 144 and the first Fresnel lens portion 145a, and FIG. 11B is a simulation result of illuminance distribution based on light incident from the second Fresnel lens portion 145b. 11C corresponds to the illuminance scale of FIG. 11B according to FIG. 11A, and FIG. 11D shows the illuminance distribution based on the light incident from the refracting portion 144, the first Fresnel lens portion 145a and the second Fresnel lens portion 145b. Simulation results of

FIG. 12 is a simulation result of the illuminance distribution in the case of assuming an irradiated region 500 mm away from the light emitting surface of the light emitting element 120. FIG. 12A is a simulation result of illuminance distribution based on light incident from the refracting portion 144 and the first Fresnel lens portion 145a, and FIG. 12B is a simulation result of illuminance distribution based on light incident from the second Fresnel lens portion 145b. 12C corresponds to the illuminance scale of FIG. 12B according to FIG. 12A, and FIG. 12D shows illuminance distribution based on light incident from the refracting portion 144, the first Fresnel lens portion 145a and the second Fresnel lens portion 145b. Simulation results of

FIG. 13 is a simulation result of the illuminance distribution in the case where it is assumed that a region to be irradiated which is 1000 mm away from the light emitting surface of the light emitting element 120. 13A is a simulation result of illuminance distribution based on light incident from the refracting portion 144 and the first Fresnel lens portion 145a, and FIG. 13B is a simulation result of illuminance distribution based on light incident from the second Fresnel lens portion 145b. 13C corresponds to the illuminance scale of FIG. 13B in FIG. 13A, and FIG. 13D shows illuminance distribution based on light incident from the refracting portion 144, the first Fresnel lens portion 145a and the second Fresnel lens portion 145b. Simulation results of

FIG. 14 is a simulation result of the illuminance distribution in the case where it is assumed that a region to be irradiated 1500 mm away from the light emitting surface of the light emitting element 120 is assumed. FIG. 14A is a simulation result of illuminance distribution based on light incident from the refracting portion 144 and the first Fresnel lens portion 145a, and FIG. 14B is a simulation result of illuminance distribution based on light incident from the second Fresnel lens portion 145b. 14C corresponds to the illuminance scale of FIG. 14B according to FIG. 14A, and FIG. 14D shows illuminance distribution based on light incident from the refracting portion 144, the first Fresnel lens portion 145a and the second Fresnel lens portion 145b. Simulation results of

The vertical and horizontal axes in the left views of FIGS. 11 to 14 indicate the distance (mm) from the light axis LA of the light emitting element (the central axis CA of the light flux controlling member 140). Further, the vertical axis in the right figure indicates the illuminance (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 regardless of the distance from the light emitting surface of the light emitting element 120. The light incident from the lens portion 145 a illuminates the outer peripheral portion of the illuminated 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 illuminated region. Furthermore, as shown in FIG. 11D, FIG. 12D, FIG. 13D and FIG. 14D, in the light emitting device 100 having 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 square.

As described above, if the first virtual quadrilateral S1 and the second virtual quadrilateral S2 are squares, it is possible to illuminate the square-shaped irradiated area as in the present embodiment. That is, the shapes of the first virtual quadrilateral S1 and the second virtual quadrilateral S2 and the shape of the irradiated region are similar. Therefore, in the case of illuminating the rectangular irradiation area, the first virtual quadrangle S1 and the second virtual quadrangle S2 may be made rectangular.

The arrows in FIG. 6, FIG. 11D, FIG. 12D, FIG. 13D and FIG. 14D indicate histograms of illuminance at the four corners (darkest parts) of the illuminated area. This indicates that the four corners of the irradiated area when the light flux controlling member 140 according to the present embodiment is used is 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 satisfying the light beam control condition described above on each side of the square. It can be seen that the square shaped irradiation region up to the outer peripheral portion is illuminated uniformly and efficiently.

[effect]
As described above, the light beam control member 140 according to the present embodiment controls the light distribution of the light emitted from the output region 142 by the light flux control of the first Fresnel lens portion 145a and the second Fresnel lens portion 145b. By controlling according to the conditions, it is possible to illuminate the square shaped irradiation area uniformly and efficiently.

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 square light emitting element 120, the positional relationship between one side of light emitting element 120 and one side of first virtual square S1 (second virtual square S2) of light flux controlling member 140 is not particularly limited either. Even in the case of arranging them, the same effect can be obtained.

[Configuration of lighting device]
Next, a lighting device 400 having the light emitting device 100 according to the present embodiment will be described.

FIG. 15 is a diagram showing a configuration of a lighting device 400 according to the present embodiment. As shown in FIG. 15, the lighting device 400 may have 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 light emitted from the light emitting device 100 and protects the light emitting device 100. The cover 420 is disposed on the light path of the light emitted from the light emitting device 100. The material of the cover 420 is not particularly limited as long as the above-described function can be exhibited. The material of the cover 420 is a light transmitting resin such as polymethyl methacrylate (PMMA), polycarbonate (PC), epoxy resin (EP), or glass.

[effect]
Illumination 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.

Second Embodiment
The light emitting device and the illuminating device according to the second embodiment are different from the light emitting device 100 and the illuminating device 400 according to the first embodiment in the shape of the light flux controlling member 240. Therefore, the same components as those of the light emitting device 100 and the lighting device 400 according to the first embodiment will be assigned the same reference numerals and descriptions thereof will be omitted, and new components of the light flux controlling member 240 will be mainly described. The light flux controlling member 240 according to the second embodiment differs from the light flux controlling member 140 according to the first embodiment in that the light flux controlling member 240 further has a wall portion 260 separating adjacent ridges on the diagonal 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 the light flux controlling member 240 according to Embodiment 2 as viewed from the lower side, and FIG. 16B is an enlarged view of a portion shown by a broken line in FIG. 16A. FIG. 17A is a bottom view of the light flux controlling member 240 according to the second embodiment, FIG. 17B is a side view, and FIG. 17C is a bottom view with the refracting portion 144 and the Fresnel lens portion 245 omitted. 17D is a cross-sectional view of line FF shown in FIG. 17A. 18A is a cross-sectional view taken along the line GG shown in FIG. 17A, FIG. 18B is an enlarged view of a portion shown by a broken line in FIG. 18A, and FIG. 18C is a cross-sectional view taken along the HH line. 18D is an enlarged view of a portion shown by a broken line in FIG. 18C, FIG. 18E is a cross-sectional view of a line II, and FIG. 18F is an enlarged view of a portion shown by a broken line in FIG. 18G is a cross-sectional view taken along the line JJ, and FIG. 18H is an enlarged view of a portion shown 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 output area 142. A flange 243 is provided between the incident area 241 and the outgoing area 142. Further, the incident area 241 has a refracting portion 144, and a Fresnel lens portion 245 including a first Fresnel lens portion 245a and a second Fresnel lens portion 145b.

The first Fresnel lens portions 245a are assumed to have a plurality of first virtual quadrilaterals S1 arranged so as to be similar to each other in plan view and concentric and parallel to each other, and four first quadrilaterals arranged on four sides thereof It has convex ridges 247.

The wall portion 260 is disposed on each diagonal of the first virtual quadrangle S1. The wall portion 260 has a predetermined thickness, and separates two first ridges 247, 247 adjacent to each other in the first virtual quadrangle S1. The wall portion 260 is designed to have the same height as the height of the valley of the first ridge 247 to the top of the first ridge 247 or more. 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. In addition, the wall portion 260 is continuously disposed from the first ridge 247 of the first virtual quadrilateral S1 that is the innermost in plan view to the first ridge 247 of the first virtual quadrilateral S1 that is the outermost. . The inner end of the wall 260 may extend to the bending portion 144.

Further, in the wall portion 260, if one end in the direction of the diagonal of the first virtual quadrangle S1 reaches the refracting portion 144 and the other end reaches the second Fresnel lens portion 145b, the first convex is generated. It may be lower than the height to the top of the bar 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 is the same as the simulation result of the distribution.

(Structure of mold)
Next, a forming die 270 for forming the light flux controlling member 240 according to the second embodiment will be described. 19 to 21 are diagrams showing the configuration of a forming die 270 used for forming the light flux controlling member 240 according to the second embodiment. 19A is a bottom perspective view of the first mold 272 of the forming die 270, 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 a portion of circle C2 shown. FIG. 20A is a bottom view of the first mold 272, FIG. 20B is a bottom view omitting the refractive part molding area and the Fresnel lens part molding area 274, and FIG. 20C is a KK shown in FIG. 20A. FIG. 20D is a cross-sectional view of a line, and FIG. 20D is an enlarged view of a portion shown by a broken line in FIG. 20A. 21A is a cross-sectional view taken along the line L-L shown in FIG. 21A, FIG. 21B is an enlarged view of a portion shown by a broken line in FIG. 21A, and FIG. 21C is a cross-sectional view taken along the line M-M. FIG. 21D is an enlarged view of a portion indicated by a broken line in FIG. 21C, FIG. 21E is a cross-sectional view of line NN, and FIG. 21F is an enlarged view of a portion indicated by a broken line in FIG. FIG. 21G is a cross-sectional view taken along line OO, and FIG. 21H is an enlarged view of a portion shown 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 (concave portions). However, as described above, the light flux controlling member 240 according to the present invention has the Fresnel lens portion 245 including the linear first convex streaks 247. Therefore, the forming die 270 according to the present invention can not form a concave corresponding to the first protrusion 247 by lathe processing. In addition, when two concave streaks adjacent to each other are connected, it is difficult to form a corner by the concave streak by machining. Even if a concave corresponding to the first ridge 247 can be formed, air bubbles may remain at the boundary between the concave and the adjacent concave 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 280 is disposed at the boundary portion of the adjacent first concaves 277.

As shown in FIG. 19 to FIG. 21, the molding die 270 has a first mold 272 for molding a portion on the incident area 241 side of the light flux control member 240 and a mold for molding the portion on the emission area 142 side. And 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 refracting portion forming region 273 for forming the refracting portion 144 and a Fresnel lens portion forming region 274 for forming the Fresnel lens portion 245. The Fresnel lens portion forming area 274 has a plurality of concave streaks arranged on each side of a plurality of virtual quadrilaterals arranged to be concentric and parallel to each other in plan view. On each diagonal of the virtual quadrilateral, a groove portion is disposed which separates a concave stripe disposed on one side of the virtual quadrilateral and a concave stripe disposed on the other side adjacent to one side of the virtual quadrilateral ing. More specifically, the Fresnel lens part molding area 274 is located outside the first Fresnel lens part molding area, a first Fresnel lens part molding area 275 for molding the first Fresnel lens part 145a, and And a second Fresnel lens portion forming area 276 for forming the second Fresnel lens portion 145 b.

The first Fresnel lens portion forming regions 275 correspond to the plurality of first virtual quadrilaterals S1 and are formed of the plurality of first virtual quadrilaterals S1 ′ which are similar to each other in plan view and are concentric and parallel to each other. It has a plurality of first concaves 277 arranged on each side. The first virtual quadrangle S1 'corresponds to the aforementioned virtual quadrangle, and the first concave streak 277 corresponds to the aforementioned concave streak. A groove 280 is disposed on each diagonal of the first virtual quadrangle S1 '.

The second Fresnel lens part molding area 276 is similar to the first virtual quadrilateral S1 ′ in plan view corresponding to one or more of the first virtual quadrilateral S1 ′, and is concentric with the first virtual quadrilateral S1 ′ It has a plurality of second concaves 278 arranged on each side of one or more second virtual quadrilaterals S2 'arranged such that the sides are parallel. The second virtual quadrilateral S2 'corresponds to the aforementioned virtual quadrilateral, and the second concave streak 278 corresponds to the aforementioned concave streak.

The groove 280 functions as a passage for degassing of the cavity at the time of injection molding to be described later. The groove 280 has a predetermined depth, and separates two adjacent first concave lines 277 and 277 adjacent to each other in the first virtual quadrangle S1 '. The groove 280 is formed to have the same depth or a depth greater than that from the top of the first concave 277 to the valley of the first concave 277. In addition, the groove 280 is continuously disposed from the first concave streak 277 of the first virtual quadrilateral S1 ′ at the innermost side in plan view to the first concave streak 277 of the first virtual quadrilateral S1 ′ at the outermost side There is. That is, the groove 280 may be disposed at least in the first Fresnel lens portion molding region 275. Note that the inner end of the groove 280 may extend to the refractive part molding area 273.

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

As described above, the light flux controlling member 240 can be manufactured by injection molding. Injection molding includes a mold clamping process of clamping a mold 270 (first mold 272 and a second mold), a filling process of filling a molten resin into the interior (cavity) of the mold 270, and a mold There is a pressure holding process of naturally cooling while holding pressure in a state where the molten resin is filled in the resin 270 and a mold opening process of opening the mold 270 clamped.

As described above, since the groove 280 only needs to function as a passage for degassing in the filling step during injection molding, the depth of the groove 280 is necessarily the depth from the top of the first concave 277 to the valley. There is no need to match it. Therefore, in the light flux controlling member 240, the wall portion 260 may be formed continuously so as to connect the refracting portion 144 and the second Fresnel lens portion 145b. In addition, the molten resin does not have to completely flow in the filling step. The shape of the groove 280 is not particularly limited as long as the gas in the cavity escapes in the filling step.

Furthermore, since the groove 280 may function as a passage for degassing, the number of the grooves 280 may be one or two to four. When there is one groove 280, the groove 280 may be formed on the opposite side of the gate filled with the molten resin, or may not be formed on the opposite side.

(effect)
The light flux controlling member 240 according to the present embodiment has the same effect as the 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.

The molding die 270 according to the present embodiment has the groove 280 for degassing, so that the generation of molding defects due to air bubbles can be suppressed and the manufacturing yield can be improved. Further, in the molding die 270 according to the present embodiment, adjacent linear first concave streaks 277, 277 are separated from each other, there is no need to connect the first concave streaks 277 in a rectangular shape, and the rectangular corners Since it is not formed, it is possible to easily form the Fresnel lens portion molding region 274 by machining.

The first molding die 272 may be divided into four in a plane including the diagonal of the first virtual quadrangle S1 'and the central axis CA. In this case, since the groove portions 280 can prevent the end faces of the first recessed strips 277 from colliding with each other during the assembling operation of the first molding die 272, the assembling operation can be facilitated.

Third Embodiment
(Configuration of luminous flux control member)
The light emitting device and the illuminating device of the third embodiment are different from the light emitting device and the illuminating device of the second embodiment in the shape of the light flux controlling member 340. Therefore, the same components as those of the light emitting device 100 and the lighting device 400 according to the second embodiment will be assigned the same reference numerals and descriptions thereof will be omitted, and new components of the light flux controlling member 340 will be mainly described. The light flux controlling member 340 according to the third embodiment differs from the light flux controlling member 240 according to the second embodiment in the sectional shape of the wall portion.

22 to 24 are diagrams showing the configuration of the light flux controlling member 340 according to the third embodiment. FIG. 22A is a perspective view of the light flux controlling member 340 according to Embodiment 3 as viewed from the lower side, and FIG. 22B is an enlarged view of a portion shown by a broken line in FIG. 22A. FIG. 23A is a bottom view of the light flux controlling member 340 according to the third embodiment, FIG. 23B is a side view, and FIG. 23C is a bottom view with the refracting portion 144 and the Fresnel lens portion 345 omitted. 23D is a cross-sectional view of line PP shown in FIG. 23A. 24A is a cross-sectional view taken along the line QQ shown in FIG. 23A, FIG. 24B is an enlarged view of a portion shown by a broken line in FIG. 24A, and FIG. 24C is a cross-sectional view taken along the line RR. 24D is an enlarged view of a portion shown by a broken line in FIG. 24C, FIG. 24E is a cross-sectional view of the SS line, and FIG. 24F is an enlarged view of a portion shown by a broken line in FIG. FIG. 24G is a cross-sectional view taken along the line TT, and FIG. 24H is an enlarged view of a portion shown 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 emission area 142. A flange 243 is provided between the incident area 341 and the outgoing area 142. Further, the incident area 341 has 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 portions 345a are assumed to have a plurality of first virtual quadrilaterals S1 arranged so as to be similar to each other in plan view and concentric and parallel to each other, and the four first virtual quadrilaterals S1 arranged on the four sides It has convex lines 347.

The wall portion 360 is disposed on each diagonal of the first virtual quadrangle S1. The wall portion 360 has a predetermined thickness, and separates two first convex lines 347 and 347 adjacent to each other in the first virtual quadrangle S1. The wall portion 360 is designed to have the same height as the height from the valley of the first ridge 347 to the top of the first ridge 347 or more. The cross-sectional shape of the wall portion 360 in the direction orthogonal to the diagonal line of the first virtual quadrangle S1 is a vertically long isosceles triangle. In addition, the wall portion 360 is continuously disposed from the first convex strip 347 of the first virtual quadrangle S1 which is the innermost in the plan view to the first convex strip 347 of the first virtual quadrangle S1 which is the outermost. . The inner end of the wall 360 may extend to the bending portion 144. The height of the wall portion 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 is the same as the simulation result of the distribution.

(Structure of mold)
Next, a forming die 370 for forming the light flux controlling member 340 according to the third embodiment will be described. 25 to 27 are views showing the configuration of a mold 370 used for molding the light flux controlling member 340 according to the third embodiment. 25A is a bottom perspective view of the first mold 372 of the mold 370, FIG. 25B is an enlarged view of a portion of a circle C3 indicated by a broken line in FIG. 25A, and FIG. 25C is a broken line FIG. 7 is an enlarged view of the portion of the circle C4 taken. FIG. 26A is a bottom view of the first mold 372, FIG. 26B is a bottom view omitting the refractive part molding area and the Fresnel lens part molding area 274, and FIG. 26C is a UU shown in FIG. FIG. 26D is a cross-sectional view of a line and FIG. 26D is an enlarged view of a portion shown by a broken line in FIG. 26A. 27A is a cross-sectional view taken along the line V-V shown in FIG. 26A, FIG. 27B is an enlarged view of a portion shown by a broken line in FIG. 27A, and FIG. 27C is a cross-sectional view taken along the WW line. 27D is an enlarged view of a portion shown by a broken line in FIG. 27C, FIG. 27E is a cross-sectional view of line XX, and FIG. 27F is an enlarged view of a portion shown by a broken line in FIG. FIG. 27G is a cross-sectional view taken along line YY, and FIG. 27H is an enlarged view of a portion shown by a broken line in FIG. 27G.

As shown in FIGS. 25 to 27, the molding die 370 has a first mold 372 for molding the incident area 341 side and a second mold (not shown) for molding 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 area 273 for molding the refractive part 144, and a Fresnel lens part molding area 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 second Fresnel lens portion 145b. And a second Fresnel lens portion forming area 276 for forming. A plurality of first virtual quadrilaterals S1 corresponding to the plurality of first virtual quadrilaterals S1 ′ which are similar to each other in plan view and are arranged concentrically and parallel to each other 1 has a concave 377. Grooves 380 are disposed on the diagonals of the first virtual quadrangle S1 '.

The groove 380 separates the two first concaves 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 of the first virtual quadrangle S1 'is a vertically long isosceles triangle. The depth to the deepest portion of the groove portion 380 is formed to be the same as or deeper than the depth from the top to the valley of the first concave 377. In addition, the groove 780 is continuously disposed from the first concave streak 377 of the first virtual quadrilateral S1 ′ at the innermost side in plan view to the first concave streak 377 of the first virtual quadrilateral S1 ′ at the outermost side There is. That is, the groove portion 380 may be disposed at least in the first Fresnel lens portion molding region 375. Note that the inner end of the groove 380 may extend to the refractive part molding area 273.

(effect)
The light flux controlling member 340 according to the present embodiment has the same effect as the light flux controlling member 240 according to the second embodiment. In addition, the light emitting device and the illuminating device according to the present embodiment have the same effects as the light emitting device and the illuminating device according to the second embodiment.

The light flux controlling member, the light emitting device, and the lighting device according to the present invention can illuminate the square shaped irradiation region uniformly and efficiently. The light emitting device according to the present invention is useful, for example, as a flash of a camera. The illumination device according to the present invention is useful as, for example, general illumination in a room, and a surface light source device having a liquid crystal panel as an illuminated surface.

This application claims priority based on Japanese Patent Application No. 2012-245492 filed on Nov. 7, 2012 and Japanese Patent Application No. 2013-012213 filed on January 25, 2013. The contents described in the application specification and drawings are all incorporated herein by reference.

DESCRIPTION OF SYMBOLS 10, 100 Light-emitting device 20, 440 Substrate 21 Substrate for light source 30 Light source 40 Fresnel lens 41 Refractive Fresnel lens part 42 Reflective Fresnel lens part 43, 141, 241, 341 Incident area 44, 142 Output area 45 Incident surface 46 Output surface 50, 140, 240, 340 Light flux control member 60 Convex part 120 Light emitting element 143, 243 Flange 144 Refractive part 145, 245, 345 Fresnel lens part 145a, 245a, 345a 1st Fresnel lens part 145b 2nd Fresnel lens part 147, 247 , 347 1st convex line 148 1st inclined surface 149 2nd inclined surface 150 2nd ridge 151 3rd inclined surface 152 4th inclined surface 260, 360 wall 270, 370 forming die 272, 372 first mold 273 refraction Part molding area 274, 374 Fresnel lens Zone molding area 275, 375 1st Fresnel lens section molding area 276 2nd Fresnel lens section molding area 277, 377 1st concave line 278 2nd concave line 280, 380 groove section 400 illumination device 420 cover CA central axis LA optical axis S1 First virtual quadrilateral S1 'First virtual quadrilateral S2 Second virtual quadrilateral S2' second virtual quadrilateral

Claims (11)

1. A luminous flux control member for controlling distribution of light emitted from a light emitting element
   An incident area where light emitted from the light emitting element is incident;
   An emission area for emitting light incident from the incident area;
   The incident region is
   A refracting portion that intersects the optical axis of the light emitting element and allows a part of the light emitted from the light emitting element to be incident, and refracts the incident light toward the emission area.
   A Fresnel lens portion located outside the refractive portion;
   Have
   The Fresnel lens portion has an incident surface on which a part of light emitted from the light emitting element is incident, and a reflective surface formed in a pair with the incident surface and reflecting incident light toward the emission region. Including multiple ridges,
   The plurality of ridges are arranged on each side of a plurality of virtual quadrilaterals arranged so as to be similar to each other in plan view and concentric and parallel to each side.
   Luminous flux control member.
2. The ridges arranged on one side of the virtual square and the ridges arranged on the other side adjacent to the side in the virtual square are separated on each diagonal of the virtual square. The light flux controlling member according to claim 1, wherein a wall portion is disposed.
3. The Fresnel lens portion has a first Fresnel lens portion located on the refractive portion side, and a second Fresnel lens portion located outside the first Fresnel lens portion.
   The virtual quadrilateral belonging to the first Fresnel lens portion is a first virtual quadrilateral, and the ridges arranged on each side of the first virtual quadrilateral are first ridges, and belong to the second Fresnel lens portion In the case where the virtual quadrilateral is a second virtual quadrilateral and the ridges arranged on each side of the second virtual quadrilateral are second ridges,
   The first Fresnel lens portion includes a plurality of the first ridges arranged on each side of the plurality of first virtual squares,
   The second Fresnel lens portion includes a plurality of the second ridges arranged on each side of one or more of the second virtual quadrilaterals,
   The wall portion is disposed at least in the first Fresnel lens portion.
   The luminous flux control member according to claim 2.
4. The Fresnel lens portion has a first Fresnel lens portion located on the refractive portion side, and a second Fresnel lens portion located outside the first Fresnel lens portion.
   The virtual quadrilateral belonging to the first Fresnel lens portion is a first virtual quadrilateral, and the ridges arranged on each side of the first virtual quadrilateral are first ridges, and belong to the second Fresnel lens portion In the case where the virtual quadrilateral is a second virtual quadrilateral and the ridges arranged on each side of the second virtual quadrilateral are second ridges,
   The first Fresnel lens portion includes a plurality of the first ridges arranged on each side of the plurality of first virtual squares,
   The second Fresnel lens portion includes a plurality of the second ridges arranged on each side of one or more of the second virtual quadrilaterals,
   In a cross section parallel to one side of the first virtual quadrangle passing through the optical axis, an angle with respect to the optical axis of light which is emitted from the emission area and deviates from the optical axis as it is separated from the emission area When the angle with respect to the optical axis of the light that is emitted from the emission area and approaches the optical axis as the distance from the emission area is “negative”:
   The first Fresnel lens portion is formed such that an angle of the first outgoing light emitted from the outgoing area via the first Fresnel lens portion with respect to the optical axis is "positive".
   The second Fresnel lens portion is formed to include light parallel to the optical axis in the second outgoing light emitted from the outgoing region via the second Fresnel lens portion.
   The luminous flux control member according to claim 1.
5. In the cross section, of the second emission light, an angle with respect to the optical axis of the second outer emission light emitted from the outermost side of the emission region with respect to the optical axis is the light of the first emission light. The light flux controlling member according to claim 4, which is smaller than an angle of the first outside outgoing light emitted from the outermost side of the outgoing area with respect to the axis with respect to the optical axis.
6. The light flux controlling member according to any one of claims 3 to 5, wherein the plurality of first virtual squares and the second virtual squares are squares.
7. A light emitting element,
   A light flux controlling member according to any one of claims 1 to 6;
   A light emitting device.
8. A light emitting device according to claim 7;
   A cover that diffuses and transmits light emitted from the light emitting device;
   A lighting device having
9. A mold for molding the light flux controlling member according to any one of claims 1 to 6, comprising:
   A Fresnel lens portion forming area for forming the Fresnel lens portion;
   The Fresnel lens portion forming area has a plurality of concave streaks arranged on each side of a plurality of virtual quadrilaterals arranged so as to be similar to each other in a plan view and concentric and parallel to each other,
   In each of the diagonal lines of the virtual quadrilateral, the concave line disposed on one side of the virtual quadrilateral and the concave line disposed on the other side adjacent to the side in the virtual quadrilateral are separated The groove is arranged,
   Mold.
10. The mold according to claim 9, wherein the depth of the groove is deeper than the depth from the top of the groove to the valley of the groove.
11. 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 quadrilateral belonging to the first Fresnel lens portion forming area is a first virtual quadrilateral, the concave streaks disposed on each side of the first virtual quadrilateral are a first concave streak, and the second Fresnel lens quadrilateral In the case where the virtual quadrilateral belonging to the forming area is a second virtual quadrilateral, and the concaves arranged on each side of the second virtual quadrilateral are second concaves,
    The first Fresnel lens unit forming area includes a plurality of the first concaves arranged on each side of the plurality of first virtual squares,
    The second Fresnel lens part molding region includes a plurality of the second concaves arranged on each side of one or more of the second virtual quadrilaterals,
    The groove is disposed at least in the first Fresnel lens unit forming area,
    The mold according to claim 9 or 10.

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