JP2018180127A - Lens and lighting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens and the like capable of obtaining a high quality light irradiation surface by suppressing generation of bright light and glare even in a structure formed with annular protrusions at the light incident side.SOLUTION: A lens 100 for controlling distribution of incident light includes: a first projection 110 circularly formed on the outer peripheral portion at the light incident side; and a plurality of second projections 120 formed concentric annularly at the light outgoing side configured to control the distribution of light incident from the inner face of a concave portion 111 constituted of the first projection 110. The first protruding portion 110 has a concave-convex structure forming concavities and convexities on the front-end portion when the lens 100 is viewed from the light incident side.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a lens and a luminaire including the same.

  A lighting device such as a downlight or a spotlight may use an optical component that controls the distribution of light emitted from a light source. As such an optical component, for example, a lens is disposed in front of the light source. Heretofore, as this type of lens, there is known a lens in which a plurality of projections having a Fresnel lens function are formed in a concentric ring shape on the light incident side (light source side) of the lens (for example, Patent Document 1).

JP 2008-47448 A

  However, when a plurality of protrusions having a Fresnel lens function are formed on the light emitting side of the lens, bright lines may be generated or glare may occur on the light emitting surface due to the lens effect due to the R shape of the tip of the protrusions. As a result, there is a problem that the quality of the light irradiated surface is degraded.

  The present invention has been made to solve such a problem, and it is possible to suppress the occurrence of bright lines and glare and to achieve high quality even in a structure in which an annular protrusion is formed on the light incident side. An object of the present invention is to provide a lens and a luminaire that can realize a light irradiation surface.

  In order to achieve the above object, one aspect of the lens according to the present invention is a lens for controlling the distribution of incident light, which is a first protrusion formed annularly on the outer peripheral portion on the light incident side; The light distribution of light incident from the inner surface of the recess formed by the first protrusion is controlled, and a plurality of second protrusions formed concentrically and annularly on the light emission side are provided, and the first protrusion The front end portion is provided with a concavo-convex structure that forms asperity when the lens is viewed in plan from the light incident side.

  Moreover, the one aspect | mode of the lighting fixture which concerns on this invention is equipped with said lens and the light source arrange | positioned facing the said recessed part of the said lens.

  Even in the structure in which the annular first protrusion is formed on the light incident side, it is possible to suppress the occurrence of bright lines and glare. Thereby, a high quality light irradiation surface can be realized.

It is an outline view of a lighting fixture concerning an embodiment. It is a sectional view of a lighting fixture concerning an embodiment. It is a perspective view when the lens which concerns on embodiment is seen from the light emission side. It is a perspective view when the lens which concerns on embodiment is seen from the light-incidence side. It is a sectional view of a lens concerning an embodiment. It is a top view when the lens which concerns on embodiment is seen from the light-incidence side. It is an enlarged section perspective view when the lens concerning an embodiment is seen from the light incidence side. It is a figure for demonstrating the optical effect of the lens which concerns on embodiment. It is an enlarged plan view of the lens of a comparative example. It is an expanded sectional view of the 1st projection part of the lens of a comparative example. It is an expanded section perspective view when the lens concerning modification 1 is seen from the ight-incidence side. It is an expanded section perspective view when the lens concerning modification 2 is seen from the ight-incidence side. It is an expanded section perspective view when the lens concerning modification 3 is seen from the ight-incidence side. It is an expanded section perspective view when the lens concerning modification 4 is seen from the ight-incidence side.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below each show a preferable specific example of the present invention. Therefore, numerical values, shapes, materials, components, arrangement positions and connection forms of the components, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the components in the following embodiments, components that are not described in the independent claims indicating the highest concept of the present invention are described as optional components.

  Each figure is a schematic view and is not necessarily illustrated exactly. Therefore, for example, the scale and the like do not necessarily match in each figure. Further, in the drawings, substantially the same configurations are given the same reference numerals, and overlapping descriptions will be omitted or simplified.

Embodiment
The structure of the lighting fixture 1 which concerns on embodiment using FIG.1 and FIG.2 is demonstrated. FIG. 1 is an external view of a luminaire 1 according to the embodiment. FIG. 2 is a cross-sectional view of the lighting fixture 1.

  The lighting fixture 1 according to the present embodiment is a downlight that emits illumination light downward (floor, ground, wall, etc.), and is installed on the ceiling of a building or the like. For example, the lighting fixture 1 is embedded in the opening of the ceiling.

  As shown in FIGS. 1 and 2, the luminaire 1 includes a lens 100 and a light source 200. In the present embodiment, the lighting fixture 1 further includes a fixture main body 300, a cylindrical member 400, a frame 500, and a mounting member 600.

  The lighting fixture 1 in the present embodiment is a universal downlight, and can change the irradiation direction of the illumination light. Specifically, the instrument main body 300 (the light body portion) in which the light source 200 is disposed is rotatably supported by the frame 500 so as to change the posture with respect to the ceiling surface. And the irradiation direction of the light of the lighting fixture 1 can be changed by changing the posture with respect to the ceiling surface of the fixture main body 300.

  Hereinafter, each component of the lighting fixture 1 will be described in detail. In the present embodiment, the light emission side of the light source 200 is the front side.

[lens]
The lens 100 is a translucent optical member that controls light distribution of incident light. In the present embodiment, the lens 100 is a condensing lens that condenses incident light.

  As shown in FIG. 2, the lens 100 is disposed in front of the light source 200. Specifically, the lens 100 is disposed on the light emission side of the light source 200 at a predetermined distance from the light source 200. Therefore, the lens 100 controls the distribution of light emitted from the light source 200 and incident on the lens 100. The optical axis of the lens 100 may be substantially coincident with the optical axis of the light source 200.

  The lens 100 is formed in a predetermined shape so as to have a predetermined lens action. The lens 100 is formed using a translucent material. Specifically, the lens 100 is formed into a predetermined shape by a mold or the like using a transparent resin material such as acrylic or polycarbonate or a transparent material such as a glass material.

  Here, a specific shape of the lens 100 will be described with reference to FIGS. FIG. 3 is a perspective view when the lens 100 according to the embodiment is viewed from the light emission side, FIG. 4 is a perspective view when the lens 100 is viewed from the light incident side, and FIG. 6 is a cross-sectional view of the lens 100. FIG. 6 is a plan view of the lens 100 viewed from the light incident side. FIG. 7 is an enlarged cross-sectional perspective view of the lens 100 viewed from the light incident side. It is. 3 to 7 show the shape of the lens 100 in design.

  As shown in FIGS. 3 to 5, the lens 100 has a first projecting portion 110 (first light transmitting portion) formed on the light incident side (the light source 200 side), and a light emitting side (the light transmitting side) opposite to the light source 200 side. And a second projecting portion 120 (second light transmitting portion) formed on the side).

  The first protrusion 110 is annularly formed on the light incident side outer periphery of the lens 100. Specifically, the first protrusion 110 protrudes toward the light source 200 so as to surround the light source 200. In the present embodiment, as shown in FIG. 5, the first protrusion 110 is substantially triangular in cross section and is tapered toward the light source 200 side.

  In addition, by forming the first protrusion 110 on the lens 100, the recess 111 is formed on the lens 100. The recess 111 is formed to be recessed in a direction away from the light source 200.

  The recess 111 formed by the first protrusion 110 is formed at a position facing the light source 200. Specifically, the recess 111 is provided so as to cover the light emitting unit of the light source 200. The light emitted from the light source 200 enters the recess 111. For this reason, the inner surface of the first protrusion 110 is the light incident surface 110 a that constitutes a part of the inner surface of the recess 111. On the other hand, the outer surface of the first protrusion 110 is a light reflection surface 110 b that totally reflects the light incident on the first protrusion 110 from the light incident surface 110 a. The tip of the first protrusion 110 constitutes a connecting portion between the light incident surface 110 a and the light reflecting surface 110 b.

  As shown in FIG. 6 and FIG. 7, at the front end portion of the first protrusion 110, a concavo-convex structure 112 is provided which has concavities and convexities when the lens 100 is viewed in plan from the light incident side. That is, the concavo-convex structure 112 is provided so as to form concavities and convexities in a plane parallel to the opening surface of the recess 111 at the connection portion between the light incident surface 110 a and the light reflecting surface 110 b.

  Specifically, the concavo-convex structure 112 is a structure in which a minute concave portion and a minute convex portion are alternately formed in a ring shape. The uneven structure 112 is formed over the entire circumference of the tip of the first protrusion 110.

  As shown in FIG. 4, FIG. 5 and FIG. 7, in the present embodiment, the concavo-convex structure 112 is not only at the tip of the first protrusion 110 but also from the tip of the first protrusion 110. It is formed in the range to the root.

  Specifically, the concavo-convex structure 112 is provided on the entire inner surface of the first protrusion 110 (that is, the entire surface of the light incident surface 110 a) so as to extend in the depth direction of the recess 111. More specifically, the concavo-convex structure 112 is a micro-concave portion formed in a linear bowl shape so as to extend from the opening surface of the concave portion 111 (the tip of the first protrusion 110) to the bottom surface 111a of the concave portion 111 A plurality of shapes are formed continuously along the circumferential direction of the inner surface (the light incident surface 110 a of the first protrusion 110) of the recess 111. In other words, the concavo-convex structure 112 has a shape in which a plurality of linear convex fine convex portions are continuously formed along the circumferential direction of the concave portion 111.

  As shown in FIG. 6, regarding the concavo-convex structure 112, when the lens 100 is viewed in plan from the light incident side, the distance from the light reflecting surface 110b (the outer surface of the first protrusion 110) to the bottom of the minute recess is a. Assuming that the distance from the light reflecting surface 110 b to the vertex of the minute convex portion is b, the relationship of b−a> a is satisfied. The distance b may be, for example, 0.01 mm or less.

  Further, a plurality of dimples 113 are provided on the bottom surface 111 a of the recess 111. In the present embodiment, the dimples 113 are formed so as to be spread over the entire bottom surface 111 a of the recess 111. The bottom surface 111 a of the recess 111 is a light incident surface on which the light from the light source 200 is incident.

  The second protrusion 120 controls the distribution of light incident from the inner surface of the recess 111 formed by the first protrusion 110. As shown in FIGS. 3 and 5, a plurality of second protrusions 120 are formed concentrically and annularly on the light emission side of the lens 100. The second protrusion 120 is formed at a position opposite to the recess 111.

  The plurality of second protrusions 120 constitute an annular zone of the Fresnel lens. Specifically, the plurality of second protrusions 120 are configured of a central protrusion 121 and a plurality of annular protrusions 122 that concentrically surround the central protrusion 121.

  The central protruding portion 121 is a lens that forms the central portion of the Fresnel lens, and is a convex lens that protrudes in a direction away from the light source 200. The surface shape of the central protrusion 121 is, for example, a spherical surface, but is not limited to this. The central axis of the central protrusion 121 may be the central axis of the lens 100 and may be substantially coincident with the optical axis of the light source 200.

  The plurality of annular protrusions 122 are portions having a saw-like cross section in the Fresnel lens. Each annular protrusion 122 has a substantially triangular shape in a cross sectional view, and tapers away from the light source 200. The central axis of each annular protrusion 122 may be substantially coincident with the optical axis of the light source 200.

  As shown in FIG. 5, the third projecting portion 130 is a third light transmitting portion that protrudes to the opposite side to the first projecting portion 110. As shown in FIGS. 3 and 5, the third protrusion 130 is annularly formed so as to surround the second protrusion 120. The third protrusion 130 is substantially triangular in cross section, and tapers away from the light source 200.

  As shown in FIG. 5, the outer surface of the third protrusion 130 is continuous with the outer surface of the first protrusion 110. That is, like the outer surface of the first protrusion 110, the outer surface of the third protrusion 130 totally reflects the light incident on the third protrusion 130 from the inner surface (light incident surface 110a) of the recess 111. It is.

  Further, an annular step portion 131 is formed on the inner surface of the third projecting portion. The stepped portion 131 is formed of a plurality of steps, and has a step-like shape. Each step of the step portion 131 has a smaller inner diameter as it approaches the light source 200.

  The lens 100 configured in this manner is fixed to the instrument body 300, as shown in FIG. In the present embodiment, the lens 100 is fixed to the tool body 300 via a frame-shaped mounting member 600 fixed to the tool body 300. Specifically, the mounting member 600 is fixed so as to be fitted on the inner surface of the shade portion 320 of the instrument main body 300, and the lens 100 is a claw portion provided on the front open end of the mounting member 600. It is locked at 610. As shown in FIGS. 3 to 5, in the peripheral portion on the light emission side of the lens 100, a step-like recessed portion 132 to which the claw portion 610 of the mounting member 600 is engaged is formed. As shown in FIG. 2, the lens 100 can be fixed to the mounting member 600 by locking the claws 610 of the mounting member 600 to the depressions 132 of the lens 100 by snap-in. The mounting member 600 is made of, for example, a resin, but may be made of metal.

[light source]
As shown in FIG. 2, the light source 200 is disposed in the instrument body 300. Specifically, it is fixed to the fixing portion 310 of the instrument body 300. For example, the light source 200 is mounted on the mounting surface of the fixing unit 310 and attached to the fixing unit 310 by an attaching member such as a holder.

  The light source 200 is an LED light source (LED module) having an LED. The light source 200 is, for example, a white LED light source that emits white light. As one example, the light source 200 is a chip on board (COB) structure, and includes a substrate, an LED mounted on the substrate, and a sealing member for sealing the LED.

  The substrate is a mounting substrate for mounting the LED, and is, for example, a ceramic substrate, a resin substrate or a metal base substrate. Note that the substrate is provided with a pair of electrode terminals for externally receiving DC power for causing the LED to emit light, and metal wiring for supplying DC power to the LED. The electrode terminal is electrically connected to the power supply circuit by a wire. The power supply circuit is incorporated, for example, in a power supply box disposed outside the instrument body 300.

  The LED is an example of a light emitting element, and is, for example, a bare chip that emits monochromatic visible light. Specifically, the LED is a blue LED chip that emits blue light when energized. For example, a plurality of LEDs are arranged on a substrate in a matrix, and are electrically connected to each other by metal wiring formed on the substrate. Note that at least one LED may be disposed.

  The sealing member is, for example, a translucent resin. The sealing member in the present embodiment includes a phosphor as a wavelength conversion material for converting the wavelength of light from the LED. The sealing member is, for example, a phosphor-containing resin in which a phosphor is dispersed in a silicone resin. As phosphor particles, when the LED is a blue LED chip, for example, a YAG-based yellow phosphor can be used to obtain white light. In the present embodiment, the sealing member is formed in a circular shape so as to collectively seal all the LEDs, but a plurality of LEDs may be sealed in a line for each row. May be sealed individually one by one.

  Thus, the light source 200 in the present embodiment is a white LED light source configured of a blue LED chip and a yellow phosphor. The yellow phosphor absorbs a part of blue light emitted from the blue LED chip and is excited to emit yellow light. Then, the yellow light and the blue light which is not absorbed by the yellow phosphor are mixed to become white light, and the white light is emitted from the sealing member (light emitting portion).

[Device body]
As shown in FIG. 2, the instrument body 300 is a base on which the light source 200 is attached. In addition, the tool body 300 also functions as a heat sink for radiating heat generated by the light source 200. Therefore, the instrument body 300 may be made of a metal material such as aluminum or a material having a high thermal conductivity such as a high thermal conductivity resin. In the present embodiment, the entire instrument body 300 is an integral body, and is made of, for example, an aluminum die cast made of aluminum.

  In the present embodiment, the instrument body 300 includes a fixing portion 310, a shade portion 320, and a heat dissipation portion 330.

  The fixing unit 310 is a pedestal portion to which the light source 200 is fixed. The fixing unit 310 has a mounting surface on which the light source 200 is mounted. The mounting surface is a front surface of the fixing portion 310. In addition, a reflector formed to surround the light source 200 may be attached to the fixing unit 310. Thereby, the light emitted to the side from the light source 200 can be reflected by the reflector to be incident on the lens 100.

  The sword portion 320 is a cylindrical portion provided on the front side of the fixed portion 310. The seed portion 320 is provided on the periphery of the fixed portion 310. The light emitted from the lighting apparatus 1 is emitted from the front open end of the sword portion 320.

  The heat radiating portion 330 is a portion that radiates the heat generated by the light source 200. Specifically, the heat radiating portion 330 is a heat radiating fin, and is a plurality of plate-like bodies provided on the rear side of the fixed portion 310. The plurality of heat radiation fins are erected on the back surface of the fixed portion 310 so as to be parallel to one another. Thus, the heat generated by the light source 200 can be efficiently dissipated by providing the heat dissipation unit 330 in the fixing unit 310.

  The fixture body 300 configured in this manner is supported by the frame 500 so as to be capable of pivoting (swinging) in order to change the irradiation direction of the light of the lighting fixture 1. Specifically, the device body 300 is configured to change the relative angle with respect to the frame 500 fixed to the opening of the ceiling. In the present embodiment, the tool main body 300 is pivotable with a direction parallel to the opening surface of the frame portion 510 of the frame 500 (horizontal direction in the present embodiment) as a pivot axis.

  Specifically, when the screw 700 screwed into the protrusion 340 provided on the side surface of the tool body 300 moves along the slit of the support portion 520 of the frame 500, the tool body 300 is rotated.

[Cylindrical member]
As shown in FIGS. 1 and 2, the cylindrical member 400 is a cylindrical member disposed on the inner surface on the front side of the shade portion 320 of the instrument body 300. The cylindrical member 400 is disposed on the front side of the lens 100. The cylindrical member 400 can be formed using, for example, a resin material such as polycarbonate or PBT.

  The cylindrical member 400 functions as a baffle that suppresses glare. The inner surface of the cylindrical member 400 is, for example, a black surface which is a glare suppression surface. The black glare suppression surface can be realized, for example, by applying a matting treatment to the surface painted black. A black glare suppression surface can also be realized by embossing the surface painted black or the surface consisting of a black member.

  Furthermore, in the present embodiment, in order to further suppress glare on the inner surface of the cylindrical member 400, a stepped portion is provided on the inner surface of the cylindrical member 400.

[Frame]
As shown in FIGS. 1 and 2, the frame 500 supports the instrument body 300 so that the instrument body 300 can rotate.

  In the present embodiment, the frame 500 has a plate-like frame 510 surrounding the shade 320 of the instrument body 300 and a support 520 for supporting the instrument body 300 rotatably. The support portion 520 is a support arm formed to stand upright from a part of the frame portion 510. The support portion 520 is formed with a slit formed along the rotational direction of the tool body 300. Fixing the instrument body 300 to the support 520 in a state in which the instrument body 300 can rotate relative to the support 520 by screwing the screw 700 into the projection 340 of the instrument body 300 through the slit of the support 520 Can. The frame 500 is made of, for example, a metal plate.

  When installing the lighting fixture 1 in the opening of the ceiling, the frame 500 is attached to the cylindrical metal fixing member (not shown), and the fixing member to which the frame 500 is attached is fixed to the opening of the ceiling Thus, the luminaire 1 can be fixed to the opening of the ceiling. In this case, the fixing member can be fixed to the opening of the ceiling by a plurality of mounting springs provided on the outer peripheral surface of the fixing member.

  Note that this fixing member may also be part of the lighting apparatus 1. Moreover, you may fix the lighting fixture 1 to the opening of a ceiling by fixing the frame 500 directly to the opening of a ceiling, without using a fixing member.

[Optical action of lens]
Next, the optical action of the lens 100 according to the present embodiment will be described with reference to FIG. FIG. 8 is a view for explaining an optical function of the lens 100 according to the embodiment. In FIG. 8, a solid line indicates a locus of light emitted from the light source 200.

  As shown in FIG. 8, in the lens 100 according to the present embodiment, of the light emitted from the light source 200, light incident on the first protrusion 110 passes through the first protrusion 110 and the third protrusion 130. The light is emitted to the outside of the lens 100.

  Specifically, the light emitted from the light source 200 is incident on the light incident surface 110 a (the side surface of the recess 111) which is the inner surface of the first protrusion 110 and travels straight in the first protrusion 110, and the first protrusion The light is totally reflected by the light reflecting surface 110 b which is the outer surface of the 110 and the third protrusion 130. The totally reflected light travels straight through the first protrusion 110 and / or the third protrusion 130 and is emitted from the stepped portion 131 of the third protrusion 130 to the outside of the lens 100.

  Thus, the light incident on the first protrusion 110 is collected by the first protrusion 110 and / or the third protrusion 130. Specifically, the light incident on the first protrusion 110 is condensed so as to be substantially parallel to the optical axis of the light source 200.

  On the other hand, among the light emitted from the light source 200, the light incident on the second protrusion 120 is emitted to the outside of the lens 100 through the second protrusion 120 having a Fresnel lens function.

  Specifically, the light emitted from the light source 200 is incident on the bottom surface 111 a of the recess 111 and travels straight through the central protrusion 121 and the annular protrusion 122, and the outer surface of the central protrusion 121 and the annular protrusion 122 is refracted. The light is refracted and emitted to the outside of the lens 100.

  Thus, the light incident on the second protrusion 120 is collected by the second protrusion 120. Specifically, the light incident on the second protrusion 120 is condensed so as to be substantially parallel to the optical axis of the light source 200.

  As described above, the light emitted from the light source 200 and incident on the lens 100 receives the optical action of the lens 100 and is condensed. For example, light emitted from the light source 200 becomes collimated light by the optical action of the lens 100. Thereby, the lighting fixture 1 provided with the lens 100 can emit the spot-like illumination light.

[Characteristics of lens]
Next, the features of the lens 100 according to the present embodiment will be described in comparison with the lens 100X of the comparative example, including the background of the present invention. FIG. 9 is an enlarged plan view of the lens 100X of the comparative example, and FIG. 10 is an enlarged cross-sectional view of the first protrusion 110X of the lens 100X of the comparative example.

  As shown in FIG. 9, the lens 100 </ b> X of the comparative example has a structure in which the concavo-convex structure 112 is not formed at the tip of the first protrusion 110 </ b> X with respect to the lens 100 in the above embodiment. Specifically, in the lens 100X of the comparative example, the tip of the first protrusion 110X has the same shape along the circumferential direction.

  As described above, conventionally, there is known one in which a plurality of projections having a Fresnel lens function are formed concentrically and annularly on the light incident side (light source side) of the lens. However, when a plurality of protrusions are formed on the lens, the tip of the protrusion has an R-shape in fabrication. That is, even if the tip of the protrusion is angular in design, when the lens is actually manufactured, the tip of the protrusion is rounded depending on the mold accuracy, the material of the lens, the production conditions, etc. I will.

  Thus, when a plurality of protrusions having a Fresnel lens function are formed on the light incident side of the lens, light incident on the tip of each protrusion is collected by the R shape attached to the tip of the protrusion. It will receive the lens effect of action. As a result, light incident on the tip of the protrusion appears as a bright line on the light irradiation surface, and the quality of the light irradiation surface is degraded.

  In addition, when a plurality of projections having a Fresnel lens function are formed on the surface on the light emission side of the lens, part of the light emitted from the light source may pass through the projections without being refracted as desired by the projections. As a result, glare may occur.

  Therefore, as in the lens 100X of the comparative example shown in FIG. 9, a plurality of projecting portions having a Fresnel lens function are formed not on the light incident side of the lens but on the light emitting side of the lens. It is conceivable to form a recess in which the inner surface is a light incident surface on the surface on the light incident side.

  However, in the lens 100 </ b> X of the comparative example, an annular first protrusion 110 </ b> X that constitutes a recess serving as a light incident surface remains on the surface on the light incident side. Thereby, as shown in FIG. 10, the light incident on the tip of the first protrusion 110X is subjected to a condensing action by the R shape attached to the tip of the annular first protrusion 110X, and a bright line is generated. Do. That is, since the first protrusion 110X remains on the light incident surface, all the bright lines can not be eliminated.

  On the other hand, in the lens 100 according to the present embodiment, the annular first protrusion 110 is left on the light incident side, but as described above, the tip of the first protrusion 110 is a light. When the lens 100 is viewed in plan from the incident side, a concavo-convex structure 112 is provided.

  As a result, even if the lens 100 is actually manufactured and the tip of the first protrusion 110 has an R-shape, and the tip of the first protrusion 110 is rounded, the first protrusion is made by the uneven structure 112. It is possible to weaken the light collecting effect that the light incident on the tip of the portion 110 receives. As a result, even in the structure in which the annular first projecting portion 110 is formed on the light incident side, the generation of the bright line can be suppressed by the first projecting portion 110.

  Moreover, in the lens 100 according to the present embodiment, the plurality of concentric ring-shaped second protrusions 120 are not formed on the side where the first protrusions 110 are formed (the light incident side), but the first protrusions 110 are formed. It is formed on the side opposite to the side (light emitting side). This can suppress the occurrence of glare as compared to the case where the plurality of annular second protrusions 120 are formed on the light incident side.

  As described above, according to the lens 100 in the present embodiment, even in the structure in which the annular first protrusion 110 is formed on the light incident side, the generation of bright lines and glares can be suppressed, so that light of high quality can be obtained. An illuminated surface can be realized.

  Further, in the lens 100 according to the present embodiment, the inner surface of the first protrusion 110 is the light incident surface 110a that constitutes a part of the inner surface of the recess 111, and the outer surface of the first protrusion 110 is the light incident surface 110a. The light reflecting surface 110 b totally reflects the light incident on the first protrusion 110. The tip of the first protrusion 110 is a connecting portion between the light incident surface 110a and the light reflecting surface 110b, and the concavo-convex structure 112 is provided at this connecting portion.

  The first projecting portion 110 having the light reflecting surface 110 b which is a total reflection surface is important in controlling the light distribution of light incident on the lens 100, and the tip of the first projecting portion 110 is from the light source 200. Light is intentionally incident. For this reason, the bright line is easily noticeable if the concavo-convex structure 112 is not formed at the tip of the first projecting portion 110 having the total reflection surface (light reflecting surface 110b), but in the present embodiment, the first projecting portion 110 Since the concavo-convex structure 112 is formed at the tip of the lens, the generation of the bright line can be effectively suppressed.

  Further, in the lens 100 according to the present embodiment, the concavo-convex structure 112 has a structure in which the minute concave portions and the minute convex portions are alternately formed in an annular shape.

  Thereby, since the concavo-convex structure 112 is formed on the entire circumference of the annular first projecting portion 110, the generation of the bright line by the first projecting portion 110 can be suppressed more effectively.

  In the lens 100 according to the present embodiment, when the lens 100 is viewed in plan from the light incident side, the distance from the light reflecting surface 110b to the bottom of the minute recess is a, and the apex of the minute protrusion is from the light reflecting surface 110b. Assuming that the distance to the distance is b, it is preferable to satisfy the relationship of b−a> a. In other words, the relationship of b> 2a should be satisfied.

  As a result, generation of a bright line in the first protrusion 110 can be more effectively suppressed.

  Further, in the lens 100 according to the present embodiment, the concavo-convex structure 112 is provided on the entire inner surface of the first protrusion 110 so as to extend in the depth direction of the recess 111.

  As a result, the light incident on the light incident surface 110 a can be diffused by the uneven structure 112, so that the color unevenness of the light emitted from the lens 100 can be suppressed.

  Further, in the lens 100 according to the present embodiment, a plurality of dimples 113 are provided on the bottom surface 111 a of the recess 111.

  As a result, the light incident on the bottom surface 111 a can be diffused by the plurality of dimples 113, so color unevenness of the light emitted from the lens 100 can be further suppressed.

  Further, in the lens 100 according to the present embodiment, the plurality of second protrusions 120 form an annular zone of the Fresnel lens.

  Thus, the lens 100 can be thinned, and light incident on the lens 100 can be condensed to easily obtain spot-like illumination light.

(Modification etc.)
As mentioned above, although the lighting fixture which concerns on this invention was demonstrated based on embodiment, this invention is not limited to the said embodiment.

  For example, in the above embodiment, the shape of the concavo-convex structure 112 when the lens 100 is viewed in plan from the light incident side is a smooth curve such as a sine curve in which the apex of the micro convex and the bottom of the micro concave are curved. Although it was set as shape, it is not restricted to this, The concavo-convex structure formed in the 1st projection part 110 may be shape shown in Drawings 11-14.

  Specifically, as shown in FIG. 11, it may be a concavo-convex structure 112A having a shape in which the top of the minute convex portion is sharp in a plan view and the minute recess is a curved line. Alternatively, as shown in FIG. 12, it may be a concavo-convex structure 112 </ b> B having a shape in which the micro convex portion is a curved line and the bottom of the micro concave portion is sharp in plan view. Further, as shown in FIG. 13, the uneven structure 112 </ b> C may have a shape in which the micro convex portions and the micro concave portions are triangular in plan view. Further, as shown in FIG. 14, it may be a concavo-convex structure 112 </ b> C having a shape in which the micro convex portions and the micro concave portions are quadrangle in plan view. From the viewpoint of suppressing color unevenness, in the concavo-convex structure, as shown in FIG. 6, the curvature of the apex of the minute convex portion is large, or the apex of the minute convex portion is preferably sharp as shown in FIG.

  Further, although the lens 100 has the optical action of collimating incident light in the above embodiment, the present invention is not limited to this. For example, the lens 100 may be a spot-like illumination light obtained by further condensing incident light, or a spot-like illumination light having a reduced degree of light concentration. Further, the lens 100 is not limited to a condensing lens, and may be a lens having an effect of diverging incident light.

  Further, in the above embodiment, the light source 200 is configured to emit white light by the blue LED chip and the yellow phosphor, but the present invention is not limited to this. For example, a phosphor-containing resin containing a red phosphor and a green phosphor may be used to emit white light by combining the phosphor-containing resin with a blue LED chip.

  Moreover, in the said embodiment, although the blue LED chip was used as LED, it does not restrict to this. For example, an LED chip that emits a color other than blue may be used as the LED. In this case, in the case of using an ultraviolet LED chip which emits ultraviolet light having a wavelength shorter than that of the blue LED chip, a combination of phosphors of respective colors which are mainly excited by ultraviolet light to emit light in three primary colors (red, green and blue) Can be used. In addition, although fluorescent substance was used as a wavelength conversion material which converts the wavelength of light of LED, it does not restrict to this. For example, as a wavelength conversion material other than a phosphor, a material including a semiconductor, a metal complex, an organic dye, a pigment, or the like that contains a substance that absorbs light of a certain wavelength and emits light of a wavelength different from the absorbed light is used be able to.

  Moreover, in the said embodiment, although the light source 200 was made into the LED module of the COB structure which mounted the LED chip directly on the board | substrate, it does not restrict to this. For example, instead of the LED module of the COB structure, an LED module of an SMD (Surface Mount Device) structure may be used. The LED module of the SMD structure is a package type LED element (SMD type LED) in which an LED chip is mounted in a recess of a package (container) made of resin and a sealing member (phosphor-containing resin) is enclosed in the recess. Element), and one or more of them are mounted on a substrate.

  Moreover, although LED was used for the light source 200 in the said embodiment, it does not restrict to this. For example, as the light source 200, a semiconductor light emitting element such as a semiconductor laser or a solid light emitting element other than an LED such as an organic EL (Electro Luminescence) or an inorganic EL may be used. A lamp may be used.

  In addition, the embodiment can be realized by arbitrarily combining the components and functions in the embodiment within the scope obtained by applying various modifications that those skilled in the art would think on the embodiment, and the scope of the present invention. The form is also included in the present invention.

DESCRIPTION OF SYMBOLS 1 lighting fixture 100 lens 110 1st protrusion part 110a light-incidence surface 110b light reflection surface 111 recessed part 111a bottom surface 112, 112A, 112B, 112C uneven structure 113 dimple 120 2nd protrusion part 200 light source

Claims (8)

A lens for controlling the distribution of incident light,
A first protrusion formed annularly on an outer peripheral portion on the light incident side;
Controlling a light distribution of light incident from the inner surface of the concave portion constituted by the first projecting portion, and having a plurality of second projecting portions formed concentrically and annularly on the light emitting side;
The distal end portion of the first projecting portion is provided with a concavo-convex structure that forms a concavo-convex shape when the lens is viewed in plan from the light incident side.
lens. The inner surface of the first protrusion is a light incident surface that constitutes a part of the inner surface of the recess,
The outer surface of the first projecting portion is a light reflecting surface that totally reflects the light incident on the first projecting portion from the light incident surface,
The tip portion of the first protrusion is a connection portion between the light incident surface and the light reflection surface,
The uneven structure is provided in the connection portion,
The lens according to claim 1. The concavo-convex structure is a structure in which a minute concave portion and a minute convex portion are alternately and repeatedly formed in a ring shape.
A lens according to claim 1 or 2. Assuming that the distance from the light reflecting surface to the bottom of the minute recess is a and the distance from the light reflecting surface to the vertex of the minute protrusion is b when the lens is viewed in plan from the light incident side.
satisfy the relationship of b−a> a,
The lens according to claim 3. The uneven structure is provided on the entire inner surface of the first protrusion so as to extend in the depth direction of the recess.
The lens according to any one of claims 1 to 4. A plurality of dimples are provided on the bottom of the recess,
The lens according to any one of claims 1 to 5. The plurality of second protrusions constitute an annular zone of a Fresnel lens,
The lens according to any one of claims 1 to 6. The lens according to any one of claims 1 to 7;
And a light source disposed to face the recess of the lens.
lighting equipment.

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