CN113678030B

CN113678030B - Beam control member, light emitting device, and lighting device

Info

Publication number: CN113678030B
Application number: CN201980094351.4A
Authority: CN
Inventors: 中村真人
Original assignee: Enplas Corp
Current assignee: Enplas Corp
Priority date: 2019-03-28
Filing date: 2019-12-06
Publication date: 2024-02-09
Anticipated expiration: 2039-12-06
Also published as: JP7346549B2; WO2020194891A1; CN113678030A; JPWO2020194891A1

Abstract

The invention provides a beam control member for controlling the distribution of light emitted from a light emitting element, which can irradiate a wide area of an irradiated surface even if the beam control member is arranged at a position closer to the irradiated surface. The beam steering member has an entrance region and an exit region. The incident region includes a first control portion disposed on one side in a plan view and a second control portion disposed on the other side. The first control part has a first convex part including a first incident surface and a first reflecting surface. The second control part has a refractive incidence surface and a second convex part including a second incidence surface and a second reflection surface. The refraction incident surface has a predetermined light distribution characteristic.

Description

Beam control member, light emitting device, and lighting device

Technical Field

The present invention relates to a light flux controlling member, a light emitting device having the light flux controlling member, and a lighting device having the light emitting device.

Background

In recent years, light emitting diodes (hereinafter, simply referred to as "LEDs") have been used as light sources for illumination in place of fluorescent lamps, halogen lamps, and the like from the viewpoint of energy saving. However, LEDs are more expensive than fluorescent lamps, halogen lamps, and the like. Accordingly, a technique of uniformly irradiating a wide area with a small number of LEDs is disclosed (for example, refer to patent document 1).

Patent document 1 describes a lighting device for plant cultivation. The lighting device described in patent document 1 has two illuminators. In each luminaire, a plurality of light sources such as LEDs are arranged in a row. The two illuminators are disposed at predetermined heights from the surface to be irradiated along opposite sides of the surface to be irradiated. The two illuminators are disposed so that light from the light source is obliquely irradiated with respect to the surface to be irradiated. In the illumination device described in patent document 1, an irradiation region of an irradiation target surface is uniformly irradiated with two illuminators arranged along opposite sides of the irradiation target surface.

Prior art literature

Patent literature

Patent document 1: japanese patent application laid-open No. 2015-130838

Disclosure of Invention

Problems to be solved by the invention

When the space above the surface to be irradiated is insufficient, the position of the illuminator is brought close to the surface to be irradiated if the illuminator described in patent document 1 is used to irradiate the surface to be irradiated. In this case, since the irradiation range of one light source is narrow, it is difficult to uniformly irradiate the entire surface to be irradiated.

The present invention aims to provide a beam control member for controlling the distribution of light emitted from a light emitting element, which can irradiate a wide area of an irradiation surface even when the beam control member is disposed at a position closer to the irradiation surface. Another object of the present invention is to provide a light emitting device and a lighting device having the light flux controlling member.

Solution to the problem

The light flux controlling member of the present invention is a light flux controlling member for controlling distribution of light emitted from a light emitting element, the light flux controlling member comprising: an incident region disposed opposite to the light emitting element, for making light emitted from the light emitting element incident; and an emission region disposed on an opposite side of the incidence region, the emission region emitting light incident on the incidence region, the incidence region including: a first control unit that is disposed on one side of the incident region, in a plan view, with a virtual plane including a central axis of the light flux controlling member that coincides with an optical axis of the light emitting element; and a second control unit disposed on the other side of the incident area with the virtual plane as a boundary in a plan view, the first control unit having a first convex portion including: a first incident surface for making light emitted from the light emitting element incident; and a first reflection surface that reflects light incident from the first incidence surface toward the emission region so that an angle with respect to the central axis becomes smaller, wherein the second control unit includes: a refractive incidence surface for refracting and incidence of light emitted from the light emitting element; and a second convex portion including: a second incident surface which is disposed farther from the central axis than the refractive incident surface and which allows light emitted from the light emitting element to enter; and a second reflection surface that reflects light incident on the second incidence surface toward the emission region so that an angle with respect to the central axis becomes smaller, wherein in a cross section including the central axis, when an angle of a first light beam, which is emitted from a light emission center of the light emitting element arranged so that the optical axis coincides with the central axis, is set to θ1 and an angle of a second light beam, which is generated by emitting the first light beam controlled by the refractive incidence surface, from the emission region, is set to θ2 with respect to the central axis, the light flux controlling member satisfies the following expression (1).

[ in formula (1), θ1 ] _n-1 <θ1 _n <θ1 _n+1 ，θ2 _n-1 Is equal to theta 1 _n-1 Angle of corresponding light ray, theta 2 _n Is equal to theta 1 _n Angle of corresponding light ray, theta 2 _n+1 Is equal to theta 1 _n+1 The angle of the corresponding ray.]

The light-emitting device of the present invention has a light-emitting element; and a light flux controlling member according to the present invention, wherein an optical axis of the light emitting element coincides with a central axis of the light flux controlling member.

The lighting device of the present invention comprises: an irradiated surface; and at least one light emitting device according to the present invention, wherein the second control unit is located closer to the surface to be irradiated than the first control unit, and the optical axis is arranged so as to intersect obliquely with the surface to be irradiated, and wherein the light emitting device is arranged so that, in a cross section including the optical axis and orthogonal to the surface to be irradiated, light incident from the second control unit and emitted at a maximum angle with respect to the optical axis reaches the surface to be irradiated.

Effects of the invention

The beam control member of the present invention can uniformly irradiate the entire surface to be irradiated even when the beam control member is disposed at a position directly above the surface to be irradiated and at a position closer to the surface to be irradiated.

Drawings

Fig. 1 is a cross-sectional view showing the structure of a lighting device according to embodiment 1 of the present invention.

Fig. 2 is an enlarged partial cross-sectional view of the area enclosed by the broken line shown in fig. 1.

Fig. 3A to 3D are diagrams showing the structure of the light flux controlling member according to embodiment 1.

Fig. 4A to 4D are diagrams showing the structures of the holder and the light-emitting device in embodiment 1.

Fig. 5A and 5B are optical path diagrams in the light-emitting device according to embodiment 1.

Fig. 6 is a diagram illustrating illumination in the illumination device according to embodiment 1.

Fig. 7A to 7D are diagrams showing the configuration of a light flux controlling member according to embodiment 2 of the present invention.

Fig. 8A and 8B are optical path diagrams in the light-emitting device according to embodiment 2.

Fig. 9A to 9D are optical path diagrams in the lighting device of the reference example and optical path diagrams in the lighting devices of embodiments 3 to 5.

Fig. 10 is a cross-sectional view showing the structure of a substrate and a light-emitting device in embodiment 6.

Fig. 11A to 11D are diagrams showing the configuration of the light flux controlling member according to embodiment 6.

Fig. 12 is a cross-sectional view showing the structure of a substrate and a light-emitting device in embodiment 7.

Fig. 13A to 13D are diagrams showing the structure of a light flux controlling member according to embodiment 7.

Fig. 14A and 14B are plan views of a light flux controlling member according to a modification of embodiment 7.

Fig. 15 is a cross-sectional view showing the structure of a substrate and a light-emitting device in embodiment 8.

Fig. 16A to 16D are diagrams showing the structure of the light flux controlling member according to embodiment 8.

Fig. 17A and 17B are plan views of a light flux controlling member according to a modification of embodiment 8.

Detailed Description

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

Embodiment 1

(Structure of Lighting device)

Fig. 1 is a cross-sectional view showing the structure of a lighting device according to embodiment 1 of the present invention. Fig. 2 is an enlarged partial cross-sectional view of the area enclosed by the broken line shown in fig. 1.

As shown in fig. 1 and 2, the lighting device 100 includes an illuminated surface 110 and a light emitting device 120.

The light-emitting device 120 irradiates the irradiation surface 110 with light. The size of the irradiated surface 110 is not particularly limited, and may be appropriately set. The shape of the irradiated face 110 is also not particularly limited. In the present embodiment, the irradiated surface 110 is an elongated rectangle extending in one direction. The surface of the irradiated surface 110 may be a flat surface or a curved surface. Further, a plurality of convex portions 171 (see fig. 6) may be formed on the surface of the irradiated surface 110, or concave portions may be formed. In the present embodiment, the surface of the irradiated surface 110 is a plane. The manner in which the plurality of projections 171 are formed on the surface of the irradiation surface 110 will be described later (see fig. 6).

The light emitting device 120 is disposed at a predetermined height from the surface 110 to be irradiated, and irradiates the surface 110 with light. The number of the light emitting devices 120 is not particularly limited. The number of the light emitting devices 120 may be one or two or more. In the present embodiment, the number of the light emitting devices 120 is two. In the present embodiment, the two light emitting devices 120 are respectively arranged directly above both ends of the irradiated surface 110 in the longitudinal direction. Specifically, one light emitting device 120 of the two light emitting devices 120 is disposed directly above one end portion in one direction (long axis direction) of the surface 110 to be irradiated, and the other light emitting device 120 of the two light emitting devices 120 is disposed directly above the other end portion in the one direction (long axis direction) of the surface 110 to be irradiated. The lower end of the light emitting device 120 is located directly above the short side of the surface 110 to be irradiated, and the light emitting device 120 is disposed so as to be inclined so that light emitted from the light emitting device 120 is directed into the surface 110 to be irradiated. The height of each light emitting device 120 from the irradiated surface 110 can be appropriately set.

Each light emitting device 120 is disposed so that an optical axis OA of the light emitting element 121 obliquely intersects the surface 110 to be irradiated, and is disposed so that light incident from the second control unit 137 (see fig. 3B) and emitted at a maximum angle with respect to the optical axis OA reaches the surface 110 to be irradiated in a cross section including the optical axis OA and orthogonal to the surface 110 to be irradiated. In the present embodiment, the optical axes OA of the two light emitting devices 120 intersect. The smaller angle of the angles formed between the optical axis OA of the light emitting element 121 and the irradiated surface 110 is not particularly limited as long as the smaller angle exceeds 0 ° and is smaller than 90 °. In the present embodiment, the smaller angle of the angle formed between the optical axis OA of the light emitting element 121 and the irradiated surface 110 is 10 °.

(Structure of light-emitting device)

The light emitting device 120 has a light emitting element 121 and a light flux controlling member 122. The light emitting device 120 may be used by being fixed to the holder 123, or the light emitting device 120 may be used by being fixed to a substrate 623 described later. In the present embodiment, the light emitting device 120 is fixed to the holder 123 for use.

The light emitting element 121 emits light of a predetermined wavelength. Examples of the light emitting element 121 include a Light Emitting Diode (LED) such as a white light emitting diode, and a laser diode. The wavelength of light emitted from the light emitting element 121 is not particularly limited. The wavelength of light emitted from the light emitting element 121 may be the wavelength of visible light or the wavelength of ultraviolet light. The wavelength of light emitted from the light-emitting element 121 can be appropriately selected according to the application used. For example, when the irradiation target surface 110 is to be brightly irradiated or when plants are to be cultivated, the light emitting element 121 that emits visible light may be selected, and when the irradiation target surface 110 is to be sterilized, the light emitting element 121 that emits ultraviolet light may be selected.

(Structure of Beam controlling Member)

Fig. 3A to 3D are diagrams showing the structure of the light flux controlling member 122 according to embodiment 1. Fig. 3A is a top view, fig. 3B is a bottom view, fig. 3C is a left side view, and fig. 3D is a cross-sectional view taken along line A-A shown in fig. 3A of the beam steering member 122.

As shown in fig. 2, the light flux controlling member 122 controls the distribution of light emitted from the light emitting element 121. The light flux controlling member 122 is disposed such that the central axis CA of the light flux controlling member 122 coincides with the optical axis OA of the light emitting element 121.

As shown in fig. 3A to 3D, the beam control member 122 has an incident region 131 and an exit region 132. In the present embodiment, the light flux controlling member 122 includes a cylindrical portion 133, a flange portion 134, and a positioning convex portion 135.

The incident region 131 is disposed so as to face the light-emitting element 121, and allows light emitted from the light-emitting element 121 to enter. The incident area 131 includes a first control portion 136 and a second control portion 137. The first control unit 136 is disposed on one side (upper side in fig. 3B) of the incident region 131 with a virtual plane including the central axis CA of the light flux controlling member 122 as a boundary in a plan view (bottom view) of the incident region 131, and the central axis CA of the light flux controlling member 122 coincides with the optical axis OA of the light emitting element 121. In addition, the second control unit 137 is disposed on the other side (lower side in fig. 3B) of the incident area 131 with respect to a virtual plane including the central axis CA in a plan view (bottom view) of the incident area 131. In the lighting device 100, the light emitting device 120 is arranged such that the second control unit 137 is located closer to the irradiation surface 110 than the first control unit 136.

The first control portion 136 has a first refraction incident surface 141 and a first convex portion 142.

The first refractive surface 141 is disposed on the central axis CA side (inside) of the first control section 136. The first refraction incident surface 141 refracts and enters the light emitted from the light emitting element 121 so that the angle with respect to the central axis CA becomes smaller. In the cross section including the central axis CA, the first refractive incident surface 141 is formed so as to be closer to the exit region 132 side with distance from the central axis CA. More specifically, in the cross section including the central axis CA, the inclination of the tangent to the first refractive incident surface 141 with respect to the central axis CA becomes gradually smaller as it is away from the central axis CA in the region near the central axis CA of the first refractive incident surface 141. On the other hand, in the region of the outer periphery of the first refractive incidence surface 141 (the region near the first convex portion 142), the inclination of the tangent line of the first refractive incidence surface 141 with respect to the central axis CA becomes gradually larger as it is away from the central axis CA. In the present embodiment, the first refractive incident surface 141 has a planar shape of a fan shape having a central angle of 180 °.

The first convex portion 142 is disposed farther from the central axis CA than the first refractive incident surface 141. That is, when the central axis CA side is set to the inner side, the first convex portion 142 is disposed outside the first refraction entrance surface 141. In the cross section including the central axis CA, the first convex portion 142 controls the light emitted from the light emitting element 121 to be emitted to the emission region 132 so that the angle with respect to the central axis CA becomes smaller. The number of the first protrusions 142 is not particularly limited. In the present embodiment, the first protruding portions 142 are three. The three first protrusions 142 may all have the same size or may be different from each other. In the present embodiment, the first convex portion 142 farthest from the center axis CA among the three first convex portions 142 is larger than the other first convex portions 142. In the present embodiment, the first protruding portion 142 has a shape of a part of a circular ring (semicircular ring) in plan view. The three first protruding portions 142 are arranged such that the first ridge lines 145 are concentrically arranged.

The first convex portion 142 includes a first incident surface 143 on the side of the central axis CA (inside), a first reflecting surface 144 disposed at a position (outside) farther from the central axis CA than the first incident surface 143, and a first ridge line 145 as a connecting line between the first incident surface 143 and the first reflecting surface 144.

The first incidence surface 143 is an incidence surface for making the light emitted from the light emitting element 121 incident on the first reflection surface 144. The first incident surface 143 is arranged so as to approach the emission region 132 as approaching the central axis CA in a cross section including the central axis CA. The first incident surface 143 has a shape of a part of a circular ring in plan view.

The first reflecting surface 144 is a reflecting surface that internally reflects the light incident from the first incident surface 143 toward the emission region 132 so that the angle with respect to the central axis CA becomes smaller. The first reflecting surface 144 is disposed so as to be closer to the emission region 132 as being away from the central axis CA in a cross section including the central axis CA. The top view shape of the first reflecting surface 144 is a shape of a part of a circular ring.

The second control portion 137 has a second refraction incident surface 151 (refraction incident surface) and a second convex portion 152.

The second refraction incident surface 151 is disposed on the center axis CA side (inside) of the second control portion 137. The second refraction incident surface 151 refracts and enters the light emitted from the light emitting element 121 so that the angle with respect to the central axis CA becomes smaller. The second refraction incident surface 151 is formed to be convex toward the emission region 132 in a cross section including the central axis CA. In the present embodiment, the second refractive incident surface 151 has a planar shape of a fan shape having a center angle of 180 °.

The second convex portion 152 is disposed at a position farther from the central axis CA than the second refractive incident surface 151. That is, when the central axis CA side is set to the inner side, the second convex portion 152 is disposed outside the second refractive entrance surface 151. In the cross section including the central axis CA, the second convex portion 152 controls the light emitted from the light emitting element 121 so as to be directed toward the emission region 132 at a smaller angle with respect to the central axis CA. The number of the second protrusions 152 is not particularly limited. In the present embodiment, the second protruding portion 152 is one. The second convex portion 152 has a notch 153.

The second convex portion 152 has: the second incident surface 154 on the side of the central axis CA (inner side), the second reflecting surface 155 arranged at a position (outer side) farther from the central axis CA than the second incident surface 154, and the second ridge line 156 as a connecting line between the second incident surface 154 and the second reflecting surface 155. In the present embodiment, the second protruding portion 152 has a shape of a part of a circular ring in plan view (a part other than the cutout portion 153 is semi-circular).

The second incidence surface 154 is an incidence surface for making the light emitted from the light emitting element 121 incident on the second reflection surface 155. The second incident surface 154 is disposed so as to approach the emission region 132 as approaching the central axis CA in a cross section including the central axis CA. The second incident surface 154 has a planar shape that is a part of a circular ring.

The second reflecting surface 155 is a reflecting surface that internally reflects the light incident from the second incident surface 154 toward the emission region 132 so that the angle with respect to the central axis CA becomes smaller. The second reflecting surface 155 is disposed so as to be closer to the emission region 132 as being away from the central axis CA in a cross section including the central axis CA. The second reflecting surface 155 has a top view shape of a part of a circular ring.

The notch 153 is formed in the second convex portion 152 so as to divide the second convex portion 152 into two parts. The cutout 153 is a region where the second convex portion 152 is not formed locally, and is formed to guide light directly below the light emitting device 120. In the present embodiment, a surface parallel to the central axis CA is formed in the region located outside the second refractive incident surface 151. The position of the notch 153 is not particularly limited as long as it can guide light directly below the light emitting device 120. In the present embodiment, the notch 153 is formed at a position distant from the first control section 136. More specifically, the cutout 153 is formed at a position closest to the illuminated surface 110 when the light emitting device 120 is assembled to the lighting device 100. The width of the cutout portion 153 is not particularly limited. The width of the notch 153 may be appropriately set according to the width of the irradiated surface 110 or the like.

The tube 133 is disposed so as to surround the incident area 131 and the emission area 132. The shape of the cylindrical portion 133 is not particularly limited. In the present embodiment, the shape of the cylindrical portion 133 is a cylindrical shape. The flange 134 is connected to the base end of the tube 133 on the light emitting element 121 side.

The flange 134 is connected to an end (base end) of the tube 133 on the light emitting element 121 side. The flange 134 extends radially outward from the outer peripheral surface of the tube 133. The shape of the flange portion 134 is not particularly limited. In the present embodiment, the flange 134 is annular.

The positioning convex portion 135 is arranged to protrude from the surface (back surface) of the flange portion 134 on the light emitting element 121 side. The number of the positioning projections 135 is not particularly limited. In the present embodiment, the number of the positioning projections 135 is three. The three positioning projections 135 are arranged at equal intervals in the circumferential direction of the flange 134. The three positioning projections 135 are positioned with respect to the first substrate 161 by fitting the three positioning projections 135 into three positioning holes 164 formed in the first substrate 161 (described later) of the bracket 123.

The beam control part 122 is formed by, for example, integral molding. The material of the light flux controlling member 122 may be appropriately selected from materials having light transmittance for passing light of a desired wavelength. The materials of the beam control part 122 include: light-transmitting resins such as polymethyl methacrylate (PMMA), polycarbonate (PC), and epoxy resin (EP), and glasses.

Fig. 4A to 4D are diagrams showing the structure of the bracket 123 in embodiment 1. Fig. 4A is a top view of the bracket 123, fig. 4B is a bottom view, fig. 4C is a left side view, and fig. 4D is a cross-sectional view taken along line A-A shown in fig. 4A. In these figures, the holder 123 is shown in a state where the light emitting device 120 is assembled.

The bracket 123 has a first substrate 161, a second substrate 162, and a fixing member 163.

The first substrate 161 is a rectangular flat plate. A light emitting element 121 is disposed in the center of the first substrate 161. Three positioning holes 164 and four first fixing holes 165 are formed on the first substrate 161. Three positioning holes 164 are formed at positions corresponding to the positioning projections 135 of the beam control member 122. The positioning projections 135 of the beam control member 122 are fitted into the three positioning holes 164, respectively. Four first fixing holes 165 are formed at four corners of the first substrate 161. The four fixing members 163 are respectively screwed with the four first fixing holes 165.

The second substrate 162 is a rectangular flat plate. A through hole 166 and four second fixing holes 167 are formed in the second substrate 162. A through hole 166 is formed in a central portion of the second substrate 162 for insertion of the cylindrical portion 133 of the beam control member 122. The size of the through hole 166 is slightly larger than the cylindrical portion 133 of the beam control member 122. The peripheral portion of the through hole 166 of the second substrate 162 cooperates with the first substrate 161 to sandwich the flange portion 134 of the beam control member 122. Four second fixing holes 167 are formed at four corners of the second substrate 162. The four fixing members 163 are respectively screwed with the four second fixing holes 167.

The fixing member 163 fixes the first substrate 161 and the second substrate 162. The structure of the fixing member 163 is not particularly limited as long as the above-described function can be exhibited. In the present embodiment, the fixing member 163 is a bolt.

The step of assembling the light emitting device 120 to the holder 123 will be described with reference to fig. 4A to 4D. First, the light-emitting element 121 is disposed in a central portion of the first substrate 161. Next, the positioning convex portions 135 of the light flux controlling member 122 are fitted into the positioning holes 164 of the first substrate 161 on which the light emitting elements 121 are disposed, whereby the light flux controlling member 122 is positioned on the first substrate 161. Next, the second substrate 162 is stacked on the first substrate 161 from the emission region 132 side of the light flux controlling member 122, so that the light emitting device 120 (the flange 134 of the light flux controlling member 122) is sandwiched between the first substrate 161 and the second substrate 162. Finally, the first substrate 161 and the second substrate 162 are fixed by the fixing member 163, whereby the light emitting device 120 can be fixed to the bracket 123. In this way, the light emitting device 120 is disposed between the first substrate 161 and the second substrate 162, and the first substrate 161 and the second substrate 162 are fixed by the fixing member 163, so that the light emitting device 120 is fixed to the bracket 123.

(light path)

Here, an optical path in the light emitting device 120 will be described. Fig. 5A and 5B are diagrams showing the optical path in the light emitting device 120. Fig. 5A shows the optical path of the light incident on the first control unit 136, and fig. 5B shows the optical path of the light incident on the second control unit 137. In fig. 5A and 5B, the flange 134 and the positioning protrusion 135 of the light flux controlling member 122 are omitted.

First, as shown in fig. 5A, when light entering the first control unit 136 is observed, light emitted from the light-emitting element 121 to the first control unit 136 and having a small emission angle reaches the first refraction entrance surface 141. The light reaching the first refraction incident surface 141 is incident into the light flux controlling member 122 so that an angle with respect to the central axis CA becomes smaller. The light incident on the inside of the beam control member 122 is emitted from the emission region 132 to the outside of the beam control member 122. At this time, the light reaching the emission region 132 is emitted with little refraction due to a small angle with respect to the central axis CA (due to the incidence to the emission region 132 being almost perpendicular) (see region a of fig. 5A).

On the other hand, light emitted from the light emitting element 121 to the first control unit 136 and having a large emission angle reaches the first incident surface 143 of one of the first convex portions 142. The light reaching the first incidence surface 143 is refracted by the first reflection surface 144, and is incident into the light flux controlling member 122. In the present embodiment, light reaching the first incident surface 143 is refracted and incident so that the angle with respect to the central axis CA becomes slightly larger. The light reaching the first reflecting surface 144 is internally reflected by the first reflecting surface 144 toward the exit region 132. At this time, the light reaching the first reflecting surface 144 is internally reflected so that the angle with respect to the central axis CA becomes smaller. The light internally reflected by the first reflecting surface 144 is emitted from the emission region 132 to the outside of the beam control member 122. At this time, the light reaching the emission region 132 is emitted with little refraction due to a small angle with respect to the central axis CA (due to the incidence to the emission region 132 being almost perpendicular) (see region b of fig. 5A).

In this way, the light incident on the first control unit 136 is emitted from the emission region 132 at a small angle with respect to the central axis CA, and is directed to a region farther from the irradiation target surface 110.

Next, as is apparent from an examination of the light incident on the second control unit 137, as shown in fig. 5B, the light emitted from the light emitting element 121 to the second control unit 137 and having a smaller emission angle reaches the second refraction incident surface 151. The light reaching the second refraction entrance surface 151 enters the inside of the light flux controlling member 122 so that the angle with respect to the central axis CA becomes slightly smaller. The light incident on the inside of the beam control member 122 is emitted from the emission region 132 to the outside of the beam control member 122. At this time, the angle of the light reaching the emission region 132 with respect to the central axis CA increases as it is away from the central axis CA, and therefore the angle of the light emitted from the emission region 132 with respect to the central axis CA increases as it is away from the central axis CA.

Therefore, in the cross section including the central axis CA, when the angle of the first light beam emitted from the light emitting center of the light emitting element 121 arranged so that the optical axis OA coincides with the central axis CA is set to θ1 with respect to the central axis CA, and the angle of the second light beam generated by the first light beam being emitted from the emission region 132 after being controlled by the second refraction entrance surface 151 (without being controlled by another surface) with respect to the central axis CA is set to θ2, the first light beam (the light beam incident on the second refraction entrance surface 151) and the second light beam (the light beam emitted from the emission region 132) satisfy the following expression (1).

In the formula (1), θ1n-1< θ1n < θ1n+1, θ2n-1 is the angle of the light corresponding to θ1n-1, θ2n is the angle of the light corresponding to θ1n, and θ2n+1 is the angle of the light corresponding to θ1n+1. ]

On the other hand, some of the light emitted from the light-emitting element 121 to the second control unit 137 and having a large emission angle reaches the notch 153. The light reaching the notch 153 has a larger emission angle than the light having a smaller emission angle, and the light reaching the notch 153 enters the light flux controlling member 122 at a position closer to the emission region 132 than the second refraction incident surface 151. Thus, the light incident from the notch 153 and emitted from the emission region 132 has a larger emission angle than the light incident from the second refraction incident surface 151. Light incident from the cutout 153 is directed directly below the light-emitting device 120.

The light emitted from the light emitting element 121 to the second control unit 137 and the other part of the light having a large emission angle reaches the second incident surface 154 (neither of which is shown in fig. 5B) of the second convex portion 152. In addition, the light reaching the second convex portion 152 is controlled in the same manner as the light reaching the first incident surface 143 of the first convex portion 142, and therefore, the description of the optical path is omitted.

The light emitted from the light emitting element 121 to the second control unit 137 reaches the tube 133 at an emission angle larger than the emission angle of the light reaching the cutout 153. The light reaching the tube 133 enters the light flux controlling member 122 from the inner surface of the tube 133, and is emitted from the outer peripheral surface of the tube 133 to the outside of the light flux controlling member 122. The light incident from the tube 133 also goes directly below the light emitting device 120.

In this way, the light incident on the second control unit 137 is emitted from the emission region 132 at various angles with respect to the central axis CA, and is emitted from a region closer to the irradiation surface 110 to a region farther to some extent.

Next, an optical path in the illumination device 100 will be described. Fig. 6 is a diagram illustrating the case of illumination in the illumination device 100. Here, one light emitting device 120 shown on the left side of fig. 6 is referred to as a light emitting device 120A, and the other light emitting device 120 shown on the right side of fig. 6 is referred to as a light emitting device 120B, and this will be described. Here, a case where the convex portions 171A and 171B are formed on the irradiation surface 110 will be described. This is an example for showing that the irradiation target surface 110 can be uniformly irradiated even when the irradiation target surface 110 is not planar.

As shown in fig. 6, in the lighting device 100 of the present embodiment, the light emitting devices 120A and 120B are disposed directly above both ends of the irradiated surface 110 in the longitudinal direction. The two light emitting devices 120A and 120B are arranged such that the optical axes OA thereof intersect the surface 110 to be irradiated.

As shown in fig. 6, one light emitting device 120A of the two light emitting devices 120A and 120B irradiates an end portion of one of the irradiated surfaces 110, between a convex portion 171B closest to the other light emitting device 120B of the plurality of convex portions 171. More specifically, the light emitting device 120A irradiates areas (RA 1, RA 3) between the immediately lower side of the light emitting device 120A and the convex portion 171B, except for the shadow area (RA 2) formed by the convex portion 171A. The other light emitting device 120B of the two light emitting devices 120A and 120B irradiates the other end portion of the irradiated surface 110 between the convex portion 171A closest to the one light emitting device 120A among the plurality of convex portions 171. More specifically, the light emitting device 120B irradiates areas (RB 1, RB 3) between the immediately lower side of the light emitting device 120B and the convex portion 171A, except for the shadow area (RB 2) formed by the convex portion 171B.

In the lighting device 100 of the present embodiment, the area (RA 2) not irradiated by the light emitting device 120A is irradiated by the light emitting device 120B, and the area (RB 2) not irradiated by the light emitting device 120B is irradiated by the light emitting device 120A. As described above, in the illumination device 100 of the present embodiment, since the area RA2 (RB 2) not irradiated by one light emitting device 120A (light emitting device 120B) is irradiated by the other light emitting device 120B (light emitting device 120A), even when the surface 110 to be irradiated has irregularities, a wide area of the surface 110 to be irradiated can be irradiated substantially uniformly.

(Effect)

As described above, in the illumination device 100 according to the present embodiment, the first control unit 136 of the light flux controlling member 122 disposed at a position distant from the surface 110 to be irradiated and the second control unit 137 of the light flux controlling member 122 disposed at a position close to the surface 110 to be irradiated are different from each other in control of the light emitted from the light emitting element 121. This makes it possible to substantially uniformly irradiate the irradiation surface 110 with light from directly below the light emitting device 120 to a position farther from the light emitting device 120. Thus, even when the beam control member 122 of the illumination device 100 is disposed at a position directly above the surface 110 to be irradiated and at a position closer to the surface 110 to be irradiated, a wide area of the surface 110 to be irradiated can be substantially uniformly irradiated.

Embodiment 2

In the lighting device of embodiment 2, only the configuration of the light flux controlling member 222 is different from that of the lighting device 100 of embodiment 1. Therefore, the same components as those of the lighting device 100 of embodiment 1 are denoted by the same reference numerals, and the description thereof is omitted.

The lighting device of the present embodiment has an illuminated surface 110 and a light emitting device 220. The light emitting device 220 has a light emitting element 121 and a light flux controlling member 222.

Fig. 7A to 7D are diagrams showing the configuration of beam control unit 222 according to embodiment 2. Fig. 7A is a top view of the beam control member 222, fig. 7B is a bottom view, fig. 7C is a left side view, and fig. 7D is a cross-sectional view taken along line A-A shown in fig. 7A.

As shown in fig. 7A to 7D, the light flux controlling member 222 of the present embodiment has an incident region 231 and an exit region 132. The incident area 231 includes a first control portion 136 and a second control portion 237. The second control portion 237 has a second refraction incident surface 151 and a second convex portion 152. A cutout 253 is formed in the second convex portion 152.

In the cross section including the central axis CA, the cutout 253 in the present embodiment is an inclined surface formed so as to be closer to the emission region 132 with distance from the central axis CA. In the light flux controlling member 122 according to embodiment 1, a stepped surface is formed between the second refraction incident surface 151 and the cutout 153 (see fig. 3D), whereas in the light flux controlling member 222 according to embodiment 2, a stepped surface is not formed between the second refraction incident surface 151 and the cutout 253 (see fig. 7D).

(light path)

Here, an optical path in the light emitting device 220 will be described. Fig. 8A and 8B are diagrams showing the optical path in the light emitting device 220. Fig. 8A shows the optical path of light incident on the first control unit 136, and fig. 8B shows the optical path of light incident on the second control unit 237. In fig. 8A and 8B, the flange 134 and the positioning projection 135 of the light flux controlling member 122 are omitted. The light emitted from the light-emitting element 121 to the first control unit 136 is the same as embodiment 1, and therefore, a description thereof will be omitted.

As shown in fig. 8B, as in the light flux controlling member 122 in embodiment 1, light emitted from the light emitting element 121 to the second control unit 237 and having a small emission angle is incident on the second refraction entrance surface 151, and is controlled so as to satisfy the above formula (1). In the light flux controlling member 122 according to embodiment 1, a part of the light incident on the second refraction incident surface 151 is reflected by the step surface between the second refraction incident surface 151 and the notch 153 (see fig. 5B), whereas in the light flux controlling member 222 according to embodiment 2, since there is no step surface, a part of the light incident on the second refraction incident surface 151 is not reflected by the step surface (see fig. 8B). Therefore, the light flux controlling member 222 according to embodiment 2 can more appropriately control the light incident from the second refraction incident surface 151.

Some of the light emitted from the light-emitting element 121 to the second control unit 237 and having a large emission angle reaches the notch 253. The light reaching the cutout 253 has a larger emission angle than the light having a smaller emission angle. Thus, the light incident from the notch 153 and emitted from the emission region 132 has a larger emission angle than the light incident from the second refraction incident surface 151. Light incident from the cutout 153 is directed directly below the light-emitting device 120.

The light emitted from the light emitting element 121 to the second control unit 237 and reaching the second convex portion 152 is controlled in the same manner as the light reaching the first incident surface 143 of the first convex portion 142, and therefore, the description thereof will be omitted. The light path of the light emitted from the light emitting element 121 to the second control unit 237 and emitted at an emission angle larger than the emission angle of the light reaching the notch 153 is not described.

(Effect)

As described above, the lighting device of the present embodiment can provide the effect of the lighting device 100 of embodiment 1, and can appropriately control all light emitted from the light emitting element 121 and incident on the second refraction entrance surface 151 to the irradiation surface 110, so that the light utilization efficiency can be further improved.

Embodiment 3

In the lighting device 300 of embodiment 3, the arrangement of the light emitting devices 120 and the form of the protruding portions are different from those of the lighting device 100 of embodiment 1. Therefore, the same components as those of the lighting device 100 of embodiment 1 are denoted by the same reference numerals, and the description thereof is omitted.

Fig. 9A is a diagram for explaining the illumination in the illumination device 600 of the reference example, and fig. 9B is a diagram for explaining the illumination in the illumination device 300 of embodiment 3 of the present invention.

As shown in fig. 9A, when the convex portion 171C having the eave portion is formed at the end of the surface 110 to be irradiated, even if the light emitting devices 120A and 120B are arranged obliquely so that the emitted light is directed into the surface 110 to be irradiated, the region outside the light emitting device 120B (the region covered by the eave portion) cannot be irradiated. Therefore, in the present embodiment, the light emitting device 120B is disposed at the central portion of the surface 110 to be irradiated (the area to be irradiated), and the orientation of the light emitting device 120B is reversed. As shown in fig. 9B, the lighting device 300 of the present embodiment includes the illuminated surface 110 and two light emitting devices 120A and 120B.

A convex portion 171C having an eave portion is formed at one end of the irradiated surface 110. One light emitting device 120A of the two light emitting devices 120A and 120B is disposed at one end of the surface 110 to be irradiated, and the other light emitting device 120B is disposed at a central portion of the surface 110 to be irradiated (the area to be irradiated). The light emitting device 120B disposed in the central portion of the illuminated surface 110 is disposed so as to illuminate the region covered by the eave. Specifically, the light emitting devices 120A and 120B are arranged such that the optical axis of the light emitted from the light emitting device 120A and the optical axis of the light emitted from the light emitting device 120B face in the same direction. The light emitting device 120A irradiates between a directly lower side of the light emitting device 120A and the light emitting device 120B. The light emitting device 120B irradiates between the immediately lower side of the light emitting device 120B and the lower side of the eave portion of the convex portion 171C. As described above, in the lighting device 300 of the present embodiment, the entire illuminated area including the eave can be illuminated.

Embodiment 4

In the lighting device 400 of embodiment 4, the arrangement of the light emitting devices 220 and the form of the convex portions are different from those of the lighting device 300 of embodiment 3. Therefore, the same components as those of the lighting device 300 of embodiment 3 are denoted by the same reference numerals, and the description thereof is omitted.

Fig. 9C is a diagram illustrating illumination used in illumination device 400 according to embodiment 4 of the present invention.

As shown in fig. 9C, the lighting device 400 has the illuminated surface 110 and the two light emitting devices 120A, 120B. Projections 171C and 171D having eaves are formed at both end portions of the irradiation surface 110. The two light emitting devices 120A and 120B are disposed in a central portion of the irradiation surface 110 (irradiation region). The light emitting devices 120A and 120B disposed in the central portion of the illuminated surface 110 are disposed so as to illuminate the areas covered by the eaves, respectively. The light emitting devices 120A and 120B are arranged such that the optical axis of the light emitted from the light emitting device 120A and the optical axis of the light emitted from the light emitting device 120B are oriented in substantially opposite directions. Specifically, the light emitting device 120A irradiates a space between a region directly below the light emitting device 120A and the eave portion of the convex portion 171D. The light emitting device 120B irradiates a region between a region directly below the light emitting device 120B and the eave portion of the convex portion 171C. As described above, in the lighting device 300 of the present embodiment, the entire illuminated area including the eave can be illuminated.

Embodiment 5

In the lighting device 500 of embodiment 5, the arrangement of the light emitting devices 220 and the form of the convex portions are different from those of the lighting device 400 of embodiment 4. Therefore, the same components as those of the lighting device 400 of embodiment 4 are denoted by the same reference numerals, and the description thereof is omitted.

Fig. 9D is a diagram for explaining illumination in the illumination device 500 according to embodiment 5 of the present invention.

As shown in fig. 9D, the lighting device 500 has the illuminated surface 110 and the two light emitting devices 120A, 120B. The irradiated surface 110 is formed with two convex portions 171C and 171D having eaves disposed at both ends, and a convex portion 171a disposed at a central portion. The two light emitting devices 120A and 120B are disposed at the central portion of the irradiated surface 110 (irradiated region) and are disposed directly above the convex portion 171a. The light emitting devices 120A and 120B are arranged such that the optical axis of the light emitted from the light emitting device 120A and the optical axis of the light emitted from the light emitting device 120B are oriented in substantially opposite directions. The light emitting devices 120A and 120B disposed in the central portion of the illuminated surface 110 are disposed so as to illuminate the areas covered by the eaves, respectively. Specifically, the light emitting device 120A irradiates a space between a region directly below the light emitting device 120A and the eave portion of the convex portion 171D. The light emitting device 120B irradiates a region between a region directly below the light emitting device 120B and the eave portion of the convex portion 171C. As described above, in the lighting device 300 of the present embodiment, the entire illuminated area including the eave can be illuminated. The reflection surfaces may be formed as surfaces of the projections 171C and 171D facing the light emitting devices 120A and 120B and wall surfaces around which the illumination device 500 is disposed, so that the irradiation efficiency of the irradiation surface 110 with the light emitted from the light emitting devices 120A and 120B can be improved.

As described above, in the lighting devices 300, 400, and 500 according to embodiments 3 to 5, the entire surface 110 to be irradiated including the area covered by the eave portion can be irradiated.

Embodiment 6

In the light emitting device 620 of embodiment 6, the structure of the light flux controlling member 622 is different from that of the light emitting device 120 of embodiment 1. Therefore, the same structures as those of the light emitting device 120 of embodiment 1 are denoted by the same reference numerals, and the description thereof is omitted.

Fig. 10 is a cross-sectional view showing the structures of the substrate 623 and the light-emitting device 620 in embodiment 6. Fig. 11A to 11D are diagrams showing the structure of the light flux controlling member 622 according to embodiment 6. Fig. 11A is a top view, fig. 11B is a bottom view, fig. 11C is a side view, and fig. 11D is a cross-sectional view taken along line A-A shown in fig. 11A of the light flux controlling member 622 according to embodiment 6.

As shown in fig. 10 and 11A to 11D, the light emitting device 620 of the present embodiment includes a light emitting element 121 and a light flux controlling member 622. The light flux controlling member 622 includes an incident area 631, an exit area 132, and a tube 633. In the present embodiment, the light flux controlling member 622 does not include the flange portion 134, the positioning protruding portion 135, and the notch portion 153.

The incident area 631 in the present embodiment includes a first control unit 136 and a second control unit 637. The second control portion 637 has a second refraction incident surface 151 and a second convex portion 652. The second convex portion 652 in the present embodiment does not have the notch 153.

The second convex portion 652 has a second incident surface 654 on the side of the central axis CA (inside), a second reflecting surface 655 disposed at a position (outside) farther from the central axis CA than the second incident surface 654, and a second ridge 656 that is a connecting line between the second incident surface 654 and the second reflecting surface 655. In the present embodiment, the second convex portion 652 has a shape of a part of a circular ring (semicircular ring shape) in plan view.

The second incidence surface 654 is an incidence surface for making the light emitted from the light emitting element 121 incident on the second reflection surface 655. The second incident surface 654 is disposed so as to approach the emission region 132 as approaching the central axis CA in a cross section including the central axis CA. The second incident surface 654 has a planar shape that is a part of a circular ring (semicircular ring shape).

The second reflecting surface 655 is a reflecting surface that internally reflects the light incident from the second incident surface 654 toward the emission region 132 so that the angle with respect to the central axis CA becomes smaller. The second reflecting surface 655 is disposed so as to be closer to the emission region 132 as it is away from the central axis CA in a cross section including the central axis CA. The second reflecting surface 655 has a planar shape that is a part of a circular ring (semicircular ring shape).

The tube 633 in this embodiment is disposed so as to surround the incident area 631 and the exit area 132. The shape of the cylindrical portion 633 is not particularly limited. In the present embodiment, the shape of the cylindrical portion 633 is a cylindrical shape. A fine concave-convex shape is formed on an end surface 633a of the cylindrical portion 633 on the light emitting element 121 side. The fine concave-convex shape can be formed by embossing, for example. This can increase the surface area of the end surface 633a, and thus can improve the adhesion strength to the substrate 623.

The light flux controlling member 622 of the present embodiment may be fixed to the substrate 623 by using an adhesive 660.

As shown in fig. 10, in the present embodiment, when the light flux controlling member 622 is fixed to the substrate 623, the adhesive 660 is disposed between the end surface 633a of the cylindrical portion 633 on the light emitting element 121 side and the substrate 623, and the adhesive 660 is disposed so as to surround the end portion of the cylindrical portion 633 on the substrate 623 side.

(Effect)

As described above, the light emitting device 620 according to the present embodiment can provide the effect of the light emitting device 120 according to embodiment 1, and can improve the adhesive strength with respect to the substrate 623 even when the light flux controlling member 622 is directly fixed to the substrate 623.

Embodiment 7

In the light emitting device 720 of embodiment 7, a configuration of a light flux controlling member 722 is different from that of the light emitting device 620 of embodiment 6. Therefore, the same structures as those of the light emitting device 620 of embodiment 6 are denoted by the same reference numerals, and the description thereof is omitted.

Fig. 12 is a cross-sectional view showing the structures of the substrate 623 and the light-emitting device 720 in embodiment 7. Fig. 13A to 13D are diagrams showing the structure of beam control unit 722 according to embodiment 7. Fig. 13A is a plan view, fig. 13B is a bottom view, fig. 13C is a side view, and fig. 13D is a cross-sectional view taken along line A-A shown in fig. 13A of the light flux controlling member 722 according to embodiment 7.

As shown in fig. 12 and 13A to 13D, the light emitting device 720 of the present embodiment includes a light emitting element 121 and a light flux controlling member 722. The light flux controlling member 722 has an incident area 631, an exit area 132, a cylindrical portion 633, and a flange portion 734. In the present embodiment, the light flux controlling member 722 does not have the positioning convex portion 135 and the cutout portion 153.

Flange 734 in the present embodiment is connected to a base end portion of cylindrical portion 633 on the light emitting element 121 side.

Flange 734 extends radially outward from the outer peripheral surface of barrel 133. The shape of the flange portion 734 is not particularly limited. In the present embodiment, flange 734 is annular in shape. The flange 734 has a fine concave-convex shape formed on the end surface 734a on the light emitting element 121 side. The fine concave-convex shape can be formed by embossing, for example. This can increase the surface area of the end surface 734a, and thus can improve the adhesion strength to the substrate 623.

In the same manner, the light flux controlling member 722 of the present embodiment may be fixed to the substrate 623 by using the adhesive 660.

As shown in fig. 12, in the present embodiment, when the light flux controlling member 722 is fixed to the substrate 623, the adhesive 660 is disposed between the end surface 633a of the tube 633 on the light emitting element 121 side and the end surface 734a of the flange 734 on the light emitting element 121 side and the substrate 623, and the adhesive 660 is disposed so as to cover at least a part of the upper surface 734c and the side surface 734b of the flange 734. Thereby, the light flux controlling member 722 is fixed to the substrate 623.

(modification)

Next, beam control units 722a and 722b according to a modification of embodiment 7 will be described. Fig. 14A and 14B are plan views of beam control members 722a and 722B according to a modification of embodiment 7. Fig. 14A is a top view of a light flux controlling member 722a according to modification 1 of embodiment 7, and fig. 14B is a top view of a light flux controlling member 722B according to modification 2.

As shown in fig. 14A, the flange portion 734d of the beam control member 722a of modification 1 of embodiment 7 may be divided into a plurality of portions. In this modification, the flange 734d is divided into two. As shown in fig. 14B, the flange portion 734e of the beam control member 722B according to modification 2 of embodiment 7 may be divided into four.

(Effect)

As described above, the light-emitting device 720 of the present embodiment can improve the adhesive strength with respect to the substrate 623 as compared to the light-emitting device 620 of embodiment 6.

Embodiment 8

In the light emitting device 820 of embodiment 8, the structure of the light flux controlling member 822 is different from that of the light emitting device 720 of embodiment 7. Therefore, the same structures as those of the light emitting device 720 of embodiment 7 are denoted by the same reference numerals, and the description thereof is omitted.

Fig. 15 is a cross-sectional view showing the structures of a substrate 623 and a light-emitting device 820 in embodiment 8. Fig. 16A to 16D are diagrams showing the structure of the light flux controlling member 822 according to embodiment 8. Fig. 16A is a top view of a beam control member 822 according to embodiment 8, fig. 16B is a bottom view, fig. 16C is a side view, and fig. 16D is a cross-sectional view taken along line A-A shown in fig. 16A.

As shown in fig. 15 and 16A to 16D, the light emitting device 820 of the present embodiment includes the light emitting element 121 and the light flux controlling member 822. The light flux controlling member 822 includes an incident area 631, an exit area 132, a cylindrical portion 633, and a flange portion 834. In the present embodiment, the beam control member 822 does not have the positioning convex portion 135 and the cutout portion 153.

The flange 834 in the present embodiment has a groove 834a. The shape of the groove 834a is not particularly limited. In the present embodiment, the groove 834a has a circular shape in plan view. The cross-sectional shape of the groove 834a is rectangular.

In the same manner, the light flux controlling member 822 of the present embodiment may be fixed to the substrate 623 by using the adhesive 660.

As shown in fig. 15, in the present embodiment, when the light flux controlling member 822 is fixed to the substrate 623, the adhesive 660 is disposed between the end surface 633a of the tube 633 on the light emitting element 121 side and the end surface 734a of the flange 834 on the light emitting element 121 side, and the substrate 623, and the adhesive 660 is disposed so as to cover at least a part of the groove 834a of the flange 834. Thereby, the beam control member 822 is fixed to the substrate 623.

(modification)

Next, beam control members 822a and 822b according to a modification of embodiment 7 will be described. Fig. 17A and 17B are plan views of beam control members 822a and 822B according to a modification of embodiment 8. Fig. 17A is a plan view of a light flux controlling member 822a according to modification 1 of embodiment 8, and fig. 17B is a plan view of a light flux controlling member 822B according to modification 2.

As shown in fig. 17A, flange portion 734g of beam control member 822a of modification 1 of embodiment 8 may be divided into a plurality of portions. In this modification, the flange 834g is divided into two parts. As shown in fig. 17B, the flange 834h of the beam control member 822B according to modification 2 of embodiment 8 may be divided into four.

(Effect)

As described above, the light-emitting device 820 of the present embodiment can improve the adhesive strength with respect to the substrate 623 as compared to the light-emitting device 720 of embodiment 7.

The lighting device described above can be applied to, for example, a motor/electrical apparatus including a heat pump, that is, a motor/electrical apparatus including an indoor unit of an air conditioner, a dehumidifier, a refrigerator, and the like. In this case, the irradiated surface corresponds to a drain pan, and a light emitting element that emits ultraviolet light is used to sterilize the irradiated surface.

In embodiments 6 to 8, the light flux controlling members 622, 722a, 722b, 822a, 822b having no notch 153 are used, but in embodiments 6 to 8, the light flux controlling members 122, 222 having notches described in embodiments 1 to 5 may be used.

The present application claims priority based on japanese patent application publication No. 2019-064836, which was filed on 3/28 in 2019. The contents of the specification and drawings of this application are incorporated in their entirety into the specification of this application.

Industrial applicability

The light flux controlling member, the light emitting device, and the lighting device of the present invention can uniformly and efficiently irradiate light emitted from the light emitting element onto the surface to be irradiated.

Description of the reference numerals

100. 200, 300, 400, 500, 600 lighting device

110 illuminated face

120. 220, 620, 720, 820 light emitting device

121 luminous element

122. 222, 622, 722a, 722b, 822a, 822b beam steering component

123 support

131. 231, 631 incidence area

132. Exit area

133. 633 cylinder

134. 834, 834g, 834h flange portion

135. Positioning convex part

136. A first control part

137. 237, 637 second control part

141. First refractive incident surface

142. First convex part

143. A first incident surface

144. A first reflecting surface

145. First ridge line

151. Second refraction incident surface

152. 652 second protrusion

153. 253 cut-out portion

154. 654 second incidence plane

155. 655 second reflective surface

156. 656 second ridge

161. First substrate

162. Second substrate

163. Fixing component

164. Positioning hole

165. First fixing hole

166. Through hole

167. Second fixing hole

171A, 171B, 171C, 171D projections

633a end face

660. Adhesive agent

734a end face

734b side

734c upper surface

834a groove part

CA center shaft

OA optical axis

Claims

1. A light flux controlling member for controlling distribution of light emitted from a light emitting element, the light flux controlling member comprising:

an incident region disposed opposite to the light emitting element, for making light emitted from the light emitting element incident; and

an emission region disposed on an opposite side of the incidence region, for emitting light incident on the incidence region,

the incidence area has:

a first control unit that is disposed on one side of the incident region, in a plan view, with a virtual plane including a central axis of the light flux controlling member that coincides with an optical axis of the light emitting element; and

a second control unit disposed on the other side of the incident area with the virtual plane as a boundary in a plan view,

the first control portion has a first convex portion including: a first incident surface for making light emitted from the light emitting element incident; and a first reflection surface for reflecting light incident from the first incidence surface toward the emission region so that an angle with respect to the central axis becomes smaller,

The second control unit includes:

a refractive incidence surface for refracting and incidence of light emitted from the light emitting element; and

a second convex portion including: a second incident surface which is disposed farther from the central axis than the refractive incident surface and which allows light emitted from the light emitting element to enter; and a second reflection surface for reflecting the light incident from the second incidence surface toward the emission region so that an angle with respect to the central axis becomes smaller,

the second convex portion has a cutout portion that divides the second convex portion into two parts,

in a cross section including the central axis, when an angle of a first light ray emitted from a light emission center of the light emitting element arranged such that the optical axis coincides with the central axis is set to θ1 and an angle of a second light ray generated by causing the first light ray controlled by the refractive incidence surface to be emitted from the emission region is set to θ2, the light flux controlling member satisfies the following expression (1):

in the formula (1), θ1n-1< θ1n < θ1n+1, θ2n-1 is the angle of the light corresponding to θ1n-1, θ2n is the angle of the light corresponding to θ1n, and θ2n+1 is the angle of the light corresponding to θ1n+1.

2. The beam steering component of claim 1, wherein,

the refraction incident surface refracts and enters the light emitted from the light emitting element so that an angle with respect to the central axis becomes smaller.

3. A light-emitting device, comprising:

a light emitting element; and

the beam control part according to claim 1 or 2,

the optical axis of the light emitting element coincides with the central axis of the beam control member.

4. The light-emitting device according to claim 3, wherein,

the light emitting element emits ultraviolet rays.

5. A lighting device, characterized by comprising:

an irradiated surface; and

at least one light-emitting device according to claim 3 or 4,

the light emitting device is disposed such that the second control unit is located closer to the surface to be irradiated than the first control unit, and the optical axis is inclined and intersects with the surface to be irradiated, and the light emitting device is disposed such that, in a cross section including the optical axis and orthogonal to the surface to be irradiated, light incident from the second control unit and emitted at a maximum angle with respect to the optical axis reaches the surface to be irradiated.

6. The lighting device of claim 5, wherein,

The lighting device has two of the light emitting devices,

the irradiated surface extends in one direction and has a plurality of convex parts,

one of the two light emitting devices is arranged directly above one end of the irradiated surface in the one direction,

the other of the two light emitting devices is arranged directly above the other end of the illuminated surface in the one direction,

the one light emitting device irradiates between the one end of the irradiated surface and the projection closest to the other light emitting device among the plurality of projections,

the other light emitting device irradiates between the other end of the irradiated surface and a projection closest to the one light emitting device among the plurality of projections.