JP6917584B2 - Lenses and luminaires - Google Patents

Description

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

Lighting fixtures such as downlights or spotlights may use optical components that control the distribution of light emitted from a light source. As such an optical component, for example, a lens is arranged in front of a light source. Conventionally, as a lens of this type, a lens having a plurality of protrusions having a Fresnel lens function formed in a concentric annulus on the surface of the lens on the light incident side (light source side) is known (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2008-47448

However, when a plurality of protrusions having a Fresnel lens function are formed on the surface of the lens on the light emitting side, a bright line or glare may occur on the light irradiation surface due to the lens effect due to the R shape of the tip of the protrusion. Therefore, there is a problem that the quality of the light-irradiated surface is deteriorated.

The present invention has been made to solve such a problem, and even in a structure in which an annular protrusion is formed on the light incident side, the generation of emission lines and glare is suppressed and the quality is high. It is an object of the present invention to provide a lens and a luminaire capable of realizing a light irradiation surface.

In order to achieve the above object, one aspect of the lens according to the present invention is a lens that controls the light distribution of incident light, and includes a first protruding portion formed in an annular shape 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 the first protrusion has a plurality of second protrusions formed concentrically on the light emitting side. The tip portion is provided with a concavo-convex structure that is concavo-convex when the lens is viewed in a plan view from the light incident side.

Further, one aspect of the luminaire according to the present invention includes the above lens and a light source arranged so as to face the recess of the lens.

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

It is external drawing of the lighting equipment which concerns on embodiment. It is sectional drawing of the lighting equipment which concerns on embodiment. It is a perspective view when the lens which concerns on embodiment is seen from the light emitting side. It is a perspective view when the lens which concerns on embodiment is seen from the light incident side. It is sectional drawing of the lens which concerns on embodiment. It is a top view when the lens which concerns on embodiment is seen from the light incident side. FIG. 5 is an enlarged cross-sectional perspective view of the lens according to the embodiment when viewed from the light incident side. It is a figure for demonstrating the optical action of the lens which concerns on embodiment. It is an enlarged plan view of the lens of the comparative example. It is an enlarged cross-sectional view of the 1st protrusion part of the lens of the comparative example. FIG. 5 is an enlarged cross-sectional perspective view of the lens according to the first modification when viewed from the light incident side. FIG. 5 is an enlarged cross-sectional perspective view of the lens according to the second modification when viewed from the light incident side. FIG. 5 is an enlarged cross-sectional perspective view of the lens according to the third modification when viewed from the light incident side. FIG. 5 is an enlarged cross-sectional perspective view of the lens according to the modified example 4 when viewed from the light incident side.

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

It should be noted that each figure is a schematic view and is not necessarily shown exactly. Therefore, for example, the scales and the like do not always match in each figure. Further, in each figure, the same reference numerals are given to substantially the same configurations, and duplicate description will be omitted or simplified.

(Embodiment)
The configuration of the luminaire 1 according to the embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is an external view of the lighting fixture 1 according to the embodiment. FIG. 2 is a cross-sectional view of the lighting fixture 1.

The lighting fixture 1 in the present embodiment is a downlight that irradiates the lighting light downward (floor, ground, wall, etc.), and is installed on the ceiling or the like of a building. For example, the luminaire 1 is embedded and arranged 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 tubular member 400, a frame body 500, and a mounting member 600.

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

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

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

As shown in FIG. 2, the lens 100 is arranged in front of the light source 200. Specifically, the lens 100 is arranged on the light emitting side of the light source 200 at a predetermined distance from the light source 200. Therefore, the lens 100 controls the light distribution of the light emitted from the light source 200 and incident on the lens 100. It is preferable that the optical axis of the lens 100 substantially coincides 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 by using a translucent material. Specifically, the lens 100 is molded 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 glass material.

Here, the specific shape of the lens 100 will be described with reference to FIGS. 3 to 7. FIG. 3 is a perspective view of the lens 100 according to the embodiment when viewed from the light emitting side, FIG. 4 is a perspective view of the lens 100 when viewed from the light incident side, and FIG. 5 is a perspective view. It is a cross-sectional view of the lens 100, FIG. 6 is a plan view of the lens 100 when viewed from the light incident side, and FIG. 7 is an enlarged cross-sectional perspective view of the lens 100 when viewed from the light incident side. Is. 3 to 7 show the design shape of the lens 100.

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

The first protruding portion 110 is formed in an annular shape on the outer peripheral portion of the lens 100 on the light incident side. Specifically, the first projecting portion 110 projects toward the light source 200 so as to surround the light source 200. In the present embodiment, as shown in FIG. 5, the first protruding portion 110 has a substantially triangular shape in a cross-sectional view, and is tapered toward the light source 200 side.

Further, by forming the first protrusion 110 on the lens 100, the recess 111 is formed on the lens 100. The recess 111 is formed so as 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 portion of the light source 200. The light emitted from the light source 200 is incident on the recess 111. Therefore, the inner surface of the first protruding portion 110 becomes a light incident surface 110a that forms a part of the inner surface of the recess 111. On the other hand, the outer surface of the first protruding portion 110 is a light reflecting surface 110b that totally reflects the light incident on the first protruding portion 110 from the light incident surface 110a. The tip of the first protruding portion 110 constitutes a connecting portion between the light incident surface 110a and the light reflecting surface 110b.

As shown in FIGS. 6 and 7, a concavo-convex structure 112 is provided at the tip of the first protruding portion 110 so as to be concavo-convex when the lens 100 is viewed in a plan view from the light incident side. That is, the uneven structure 112 is provided so as to form unevenness in a plane horizontal to the opening surface of the concave portion 111 at the connection portion between the light incident surface 110a and the light reflecting surface 110b.

Specifically, the concavo-convex structure 112 is a structure in which micro-concave portions and micro-convex portions are alternately and repeatedly formed in an annular shape. The concave-convex structure 112 is formed over the entire circumference of the tip portion of the first protruding portion 110.

As shown in FIGS. 4, 5 and 7, in the present embodiment, the concave-convex structure 112 includes not only the tip of the first protrusion 110 but also the tip of the first protrusion 110 to the first protrusion 110. It is formed in the range up to the root.

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

As shown in FIG. 6, regarding the concave-convex structure 112, when the lens 100 is viewed in a plan view from the light incident side, the distance from the light reflecting surface 110b (outer surface of the first protruding portion 110) to the bottom of the minute recess is defined as a. Assuming that the distance from the light reflecting surface 110b to the apex of the minute convex portion is b, the relationship of b-a> a is satisfied. The distance b is, for example, preferably 0.01 mm or less.

Further, a plurality of dimples 113 are provided on the bottom surface 111a of the recess 111. In the present embodiment, the dimples 113 are formed so as to spread over the entire surface of the bottom surface 111a of the recess 111. The bottom surface 111a of the recess 111 is a light incident surface on which 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 in an annular shape on the light emitting side of the lens 100. The second protruding portion 120 is formed at a position facing the recess 111.

The plurality of second protrusions 120 form a ring band of the Fresnel lens. Specifically, the plurality of second protrusions 120 are composed 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 forming 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, spherical, but is not limited to this. It is preferable that the central axis of the central protrusion 121 is the central axis of the lens 100 and substantially coincides with the optical axis of the light source 200.

The plurality of annular protrusions 122 are portions of the Fresnel lens having a saw-like cross section. Each annular protrusion 122 has a substantially triangular shape in cross-sectional view, and tapers as the distance from the light source 200 increases. It is preferable that the central axis of each annular protrusion 122 substantially coincides with the optical axis of the light source 200.

As shown in FIG. 5, the third projecting portion 130 is a third translucent portion projecting to the side opposite to the first projecting portion 110. As shown in FIGS. 3 and 5, the third protrusion 130 is formed in an annular shape so as to surround the second protrusion 120. The third protruding portion 130 has a substantially triangular shape in a cross-sectional view, and tapers as the distance from the light source 200 increases.

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, the outer surface of the third protruding portion 130 is the light reflecting surface 110b that totally reflects the light incident on the third protruding portion 130 from the inner surface (light incident surface 110a) of the recess 111, similarly to the outer surface of the first protruding portion 110. Is.

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

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

[light source]
As shown in FIG. 2, the light source 200 is arranged on the instrument main body 300. Specifically, it is fixed to the fixing portion 310 of the instrument main body 300. For example, the light source 200 is mounted on the mounting surface of the fixing portion 310, and is attached to the fixing portion 310 by a mounting 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 an example, the light source 200 has a COB (Chip On Board) structure, and has a substrate, an LED mounted on the substrate, and a sealing member for sealing the LED.

The substrate is a mounting substrate for mounting an LED, and is, for example, a ceramic substrate, a resin substrate, a metal base substrate, or the like. The substrate is provided with a pair of electrode terminals for receiving DC power for causing the LED to emit light from the outside, and a metal wiring for supplying DC power to the LED. The electrode terminals are electrically connected to the power supply circuit by electric wires. The power supply circuit is built in, for example, a power supply box arranged outside the instrument main body 300.

An LED is an example of a light emitting element, for example, a bare chip that emits a single color of visible light. Specifically, the LED is a blue LED chip that emits blue light when energized. A plurality of LEDs are arranged on a substrate in a matrix, for example, and are electrically connected to each other by metal wiring formed on the substrate. It is sufficient that at least one LED is arranged.

The sealing member is, for example, a translucent resin. The sealing member in the present embodiment contains a phosphor as a wavelength conversion material that converts 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 the phosphor particles, when the LED is a blue LED chip, for example, a YAG-based yellow phosphor can be used in order 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, or each LED may be sealed. May be individually sealed one by one.

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

[Instrument body]
As shown in FIG. 2, the instrument body 300 is a base on which the light source 200 is mounted. The appliance body 300 also functions as a heat sink that dissipates 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 high thermal conductivity such as a high thermal conductivity resin. In the present embodiment, the instrument main body 300 is an integral body as a whole, and is made of, for example, aluminum die-cast aluminum.

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

The fixing portion 310 is a trapezoidal portion to which the light source 200 is fixed. The fixed portion 310 has a mounting surface on which the light source 200 is mounted. This mounting surface is a surface on the front side of the fixing portion 310. Further, a reflector formed so as to surround the light source 200 may be attached to the fixed portion 310. As a result, the light emitted laterally from the light source 200 can be reflected by the reflector and incident on the lens 100.

The shade portion 320 is a tubular portion provided on the front side of the fixed portion 310. The shade portion 320 is provided on the peripheral edge of the fixed portion 310. The emitted light of the luminaire 1 is emitted from the open end on the front side of the shade portion 320.

The heat radiating unit 330 is a portion that dissipates 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 fixing portion 310. The plurality of heat radiation fins are erected on the back surface of the fixing portion 310 so as to be parallel to each other. By providing the heat radiating portion 330 in the fixed portion 310 in this way, the heat generated by the light source 200 can be efficiently radiated.

The fixture body 300 configured in this way is supported by the frame body 500 so as to be rotatable (swing) in order to change the light irradiation direction of the lighting fixture 1. Specifically, the appliance main body 300 is configured so that the relative angle with respect to the frame body 500 fixed to the opening of the ceiling changes. In the present embodiment, the instrument main body 300 can rotate about a direction parallel to the opening surface of the frame portion 510 of the frame body 500 (horizontal direction in the present embodiment) as a rotation axis.

Specifically, the screw 700 screwed into the protrusion 340 provided on the side surface of the instrument body 300 moves along the slit of the support portion 520 of the frame body 500, so that the instrument body 300 rotates.

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

The tubular member 400 functions as a baffle that suppresses glare. The inner surface of the tubular member 400 is, for example, a black surface that serves as a glare suppressing surface. The black glare-suppressing surface can be realized, for example, by applying a matte treatment to the surface painted in black. Further, the black glare suppressing surface can also be realized by applying a graining process to a surface painted in black or a surface made of a black member.

Further, in the present embodiment, a step portion is provided on the inner surface of the tubular member 400 in order to further suppress glare on the inner surface of the tubular member 400.

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

In the present embodiment, the frame body 500 has a plate-shaped frame portion 510 that surrounds the shade portion 320 of the instrument body 300, and a support portion 520 that rotatably supports the instrument body 300. The support portion 520 is a support arm formed so as to stand upright from a part of the frame portion 510. The support portion 520 is formed with a slit formed along the rotation direction of the instrument main body 300. By screwing the screw 700 into the protrusion 340 of the instrument body 300 through the slit of the support portion 520, the instrument body 300 is fixed to the support portion 520 in a state in which the instrument body 300 can rotate with respect to the support portion 520. Can be done. The frame body 500 is made of, for example, a metal plate.

When the luminaire 1 is installed in the opening of the ceiling, the frame 500 is attached to a 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. As a result, 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.

The fixing member may also be a part of the lighting fixture 1. Further, the luminaire 1 may be fixed to the opening of the ceiling by directly fixing the frame 500 to the opening of the 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 diagram for explaining the optical action of the lens 100 according to the embodiment. In FIG. 8, the solid line shows the locus of light emitted from the light source 200.

As shown in FIG. 8, in the lens 100 according to the present embodiment, among the light emitted from the light source 200, the light incident on the first protruding portion 110 passes through the first protruding portion 110 and the third protruding portion 130. It emits light to the outside of the lens 100.

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

In this way, 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 focused so as to be substantially parallel to the optical axis of the light source 200.

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

Specifically, the light emitted from the light source 200 enters the bottom surface 111a of the recess 111, travels straight through the central protrusion 121 and the annular protrusion 122, and exerts a refraction action on the outer surfaces of the central protrusion 121 and the annular protrusion 122. It receives it, refracts it, and emits it to the outside of the lens 100.

In this way, 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 focused 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 is focused by the optical action of the lens 100. For example, the light emitted from the light source 200 becomes collimated light due to the optical action of the lens 100. As a result, the luminaire 1 provided with the lens 100 can irradiate the spot-shaped illumination light.

[Characteristics of the lens]
Next, the features of the lens 100 according to the present embodiment will be described while comparing with the lens 100X of the comparative example, including the background to 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 protruding portion 110X of the lens 100X of the comparative example.

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

As described above, conventionally, it is known that a plurality of protrusions having a Fresnel lens function are formed concentrically on the surface of the lens on the light incident side (light source side). However, if a plurality of protrusions are formed on the lens, an R shape is attached to the tip of the protrusions due to manufacturing. That is, even if the tip of the protrusion is cornered in design, the tip of the protrusion may be rounded depending on the mold accuracy, lens material, manufacturing conditions, etc. when actually manufacturing the lens. It ends up.

As a result, when a plurality of protrusions having a Fresnel lens function are formed on the surface of the lens on the light incident side, the light incident on the tip of each protrusion is focused by the R shape attached to the tip of the protrusion. It will be subject to the lens effect of action. As a result, there is a problem that the light incident on the tip of the protruding portion becomes a bright line and appears on the light irradiation surface, and the quality of the light irradiation surface deteriorates.

Further, when a plurality of protrusions having a Fresnel lens function are formed on the surface of the lens on the light emitting side, a part of the light emitted from the light source may pass through the protrusions without being desired to be refracted by the protrusions. As a result, glare may occur.

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

However, in the lens 100X of the comparative example, the annular first protrusion 110X forming the concave portion serving as the light incident surface remains on the surface on the light incident side. As a result, as shown in FIG. 10, due to the R shape attached to the tip of the annular first protrusion 110X, the light incident on the tip of the first protrusion 110X is focused and a bright line is generated. do. That is, since the first protrusion 110X remains on the surface on the light incident side, all the emission lines cannot be eliminated.

On the other hand, the lens 100 in the present embodiment has a structure in which the annular first protrusion 110 remains on the light incident side, but as described above, the tip of the first protrusion 110 is light. A concavo-convex structure 112 that is concavo-convex when the lens 100 is viewed in a plan view from the incident side 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 concave-convex structure 112 provides the first protrusion. It is possible to weaken the light condensing action received by the light incident on the tip portion of the portion 110. As a result, even in a structure in which the annular first protruding portion 110 is formed on the light incident side, it is possible to suppress the generation of bright lines by the first protruding portion 110.

Moreover, in the lens 100 of the present embodiment, the plurality of concentric annular second protrusions 120 are formed not on the side where the first protrusion 110 is formed (light incident side), but on the first protrusion 110. It is formed on the side opposite to the side (light emitting side). As a result, the occurrence of glare can be suppressed as compared with 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 a structure in which the annular first protrusion 110 is formed on the light incident side, the generation of bright lines and glare can be suppressed, so that high-quality light can be obtained. An irradiated surface can be realized.

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

The first projecting portion 110 having the light reflecting surface 110b, which is a total reflecting surface, is important for controlling the light distribution of the light incident on the lens 100, and the tip of the first projecting portion 110 is connected to the light source 200. Light is intentionally incident. Therefore, if the concave-convex structure 112 is not formed at the tip of the first protruding portion 110 having the total reflecting surface (light reflecting surface 110b), the bright line becomes conspicuous, but in the present embodiment, the first protruding portion 110 Since the concave-convex structure 112 is formed at the tip end portion of the above, the generation of bright lines can be effectively suppressed.

Further, in the lens 100 of the present embodiment, the concave-convex structure 112 is a structure in which a plurality of minute concave portions and minute convex portions are alternately repeated to form an annular shape.

As a result, the concave-convex structure 112 is formed on the entire circumference of the annular first protruding portion 110, so that the generation of bright lines by the first protruding portion 110 can be more effectively suppressed.

Further, in the lens 100 of the present embodiment, when the lens 100 is viewed in a plan view from the light incident side, the distance from the light reflecting surface 110b to the bottom of the minute concave portion is a, and the apex of the minute convex portion from the light reflecting surface 110b. Assuming that the distance to b is b, it is sufficient to satisfy the relationship of b-a> a. That is, it is preferable to satisfy the relationship of b> 2a.

As a result, it is possible to more effectively suppress the generation of bright lines in the first protruding portion 110.

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

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

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

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

Further, in the lens 100 of the present embodiment, the plurality of second protrusions 120 form a ring band of the Fresnel lens.

As a result, the lens 100 can be made thinner, and the light incident on the lens 100 can be condensed to easily obtain spot-shaped illumination light.

(Modification example, etc.)
The lighting fixture according to the present invention has been described above based on the embodiment, but the present invention is not limited to the above embodiment.

For example, in the above embodiment, the shape of the concave-convex structure 112 when the lens 100 is viewed in a plan view from the light incident side is a smooth curve such as a sine curve in which the apex of the minute convex portion and the bottom of the minute concave portion are curved lines. The shape is not limited to this, and the concave-convex structure formed on the first protruding portion 110 may have the shape shown in FIGS. 11 to 14.

Specifically, as shown in FIG. 11, the concave-convex structure 112A may have a shape in which the apex of the minute convex portion is sharp and the minute concave portion is a curved line in a plan view. Alternatively, as shown in FIG. 12, the concave-convex structure 112B may have a shape in which the minute convex portion is a curved line and the bottom of the minute concave portion is sharp in a plan view. Further, as shown in FIG. 13, the concave-convex structure 112C having a shape in which the minute convex portion and the minute concave portion are triangular in a plan view may be used. Further, as shown in FIG. 14, the concave-convex structure 112C having a shape in which the minute convex portion and the minute concave portion are square in a plan view may be used. From the viewpoint of suppressing color unevenness, it is preferable that the uneven structure has a large curvature at the apex of the minute convex portion as shown in FIG. 6 or a sharp apex of the minute convex portion as shown in FIG.

Further, in the above embodiment, the lens 100 has an optical action of collimating the incident light, but the present invention is not limited to this. For example, the lens 100 may be spot-shaped illumination light in which the incident light is further condensed, or spot-shaped illumination light in which the light condensing degree is weakened. Further, the lens 100 is not limited to a condensing lens, and may be a lens having an action 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, and the phosphor-containing resin and the blue LED chip may be combined to emit white light.

Further, in the above embodiment, a blue LED chip is used as the LED, but the present invention is not limited to this. For example, as the LED, an LED chip that emits a color other than blue may be used. In this case, when an ultraviolet LED chip that emits ultraviolet light having a shorter wavelength than the blue LED chip is used, it is a combination of phosphors of each color that are mainly excited by ultraviolet light and emit light in the three primary colors (red, green, and blue). Can be used. A phosphor is used as a wavelength conversion material for converting the wavelength of LED light, but the present invention is not limited to this. For example, as a wavelength conversion material other than a phosphor, a material containing a substance such as a semiconductor, a metal complex, an organic dye, or a pigment that absorbs light of a certain wavelength and emits light having a wavelength different from the absorbed light is used. be able to.

Further, in the above embodiment, the light source 200 is an LED module having a COB structure in which an LED chip is directly mounted on a substrate, but the present invention is not limited to this. For example, an LED module having an SMD (Surface Mount Device) structure may be used instead of the LED module having a COB structure. An LED module having an SMD structure is a package-type LED element (SMD-type LED) in which an LED chip is mounted in a recess of a resin package (container) and a sealing member (phosphor-containing resin) is sealed in the recess. This is a configuration in which one or a plurality of the elements) are mounted on a substrate.

Further, in the above embodiment, the LED is used as the light source 200, but the present invention is not limited 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, or an existing light emitting element such as a fluorescent lamp or a high brightness lamp may be used. A lamp may be used.

In addition, it is realized by arbitrarily combining the components and functions in the above-described embodiment within the range obtained by applying various modifications to the above-described embodiment and not deviating from the gist of the present invention. Forms are also included in the present invention.

1 Lighting equipment 100 Lens 110 First protrusion 110a Light incident surface 110b Light reflecting surface 111 Recessed 111a Bottom surface 112, 112A, 112B, 112C Concavo-convex structure 113 Dimple 120 Second protruding part 200 Light source

Claims (9)

A lens that controls the light distribution of incident light.
A first protruding portion formed in an annular shape on the outer peripheral portion on the light incident side, and
It controls the light distribution of light incident from the inner surface of the recess formed by the first protrusion, and has a plurality of second protrusions formed concentrically in an annular shape on the light emitting side.
The tip of the first protrusion is provided with a concavo-convex structure that is concavo-convex when the lens is viewed in a plan view from the light incident side .
The uneven structure is formed on the inner surface of the first protrusion.
The outer surface of the first protrusion is a light reflecting surface that totally reflects the light incident on the first protrusion from the inner surface of the first protrusion.
lens. The inner surface of the first protrusion is a light incident surface that forms a part of the inner surface of the recess.
The outer surface of the first protruding portion is a light reflecting surface that totally reflects the light incident on the first protruding portion from the light incident surface.
The tip of the first protruding portion is a connecting portion between the light incident surface and the light reflecting 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 micro-concave portions and micro-convex portions are alternately and repeatedly formed in an annular shape.
The lens according to claim 1 or 2. When the lens is viewed in a plan view from the light incident side, let a be the distance from the light reflecting surface to the bottom of the minute concave portion, and b be the distance from the light reflecting surface to the apex of the minute convex portion.
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 protruding portion so as to extend in the depth direction of the concave portion.
The lens according to any one of claims 1 to 4. A plurality of dimples are provided on the bottom surface of the recess.
The lens according to any one of claims 1 to 5. The plurality of second protrusions form a ring band of the Fresnel lens.
The lens according to any one of claims 1 to 6. The lens according to any one of claims 1 to 7.
A light source arranged to face the recess of the lens.
lighting equipment. Light source and
A lens that controls the light distribution of the light emitted from the light source is provided.
The lens is
A first protruding portion formed in an annular shape on the outer peripheral portion on the light incident side, which is the light source side, and
It controls the light distribution of light incident from the inner surface of the recess formed by the first protrusion, and has a plurality of second protrusions formed concentrically in an annular shape on the light emitting side.
The tip of the first protrusion is provided with a concavo-convex structure that is concavo-convex when the lens is viewed in a plan view from the light incident side.
The uneven structure is formed on the inner surface of the first protruding portion.
lighting equipment.

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