JP6624550B2 - lighting equipment - Google Patents

Description

  The present invention relates to a lighting fixture including a translucent optical member.

  2. Description of the Related Art As a recessed lighting device, for example, a ceiling recessed lighting device which is embedded in a ceiling (attached portion) like a downlight and irradiates light downward is known. This type of lighting fixture includes a light source made of an LED and an optical lens for controlling the light distribution of light emitted from the light source inside the fixture main body.

  Conventionally, it has been proposed to employ a Fresnel lens as an optical lens in order to make an optical lens for controlling light distribution thin and small (for example, Patent Document 1). For example, the Fresnel lens disclosed in Patent Document 1 has a concentric groove formed on a light incident side surface, and has a sawtooth cross-sectional shape. When such a Fresnel lens is used in a lighting apparatus, a slight ring-shaped irradiation unevenness occurs on the light irradiation surface due to the cross-sectional shape.

  Therefore, in the lighting apparatus disclosed in Patent Document 1, it has been proposed to provide a minute light diffusion portion (dimple) on the entire exit surface of the Fresnel lens. Thereby, the light emitted from the Fresnel lens can be diffused appropriately, so that the occurrence of the above-mentioned irradiation unevenness can be suppressed.

JP-A-2013-138761

  However, in the luminaire disclosed in Patent Document 1, light emitted from the Fresnel lens is diffused by the light diffusing unit, so that a part of the emitted light is radiated to a region other than a desired irradiation region. As a result, the lighting apparatus disclosed in Patent Document 1 has a problem that the light distribution shape is changed by the light diffusion unit.

  Therefore, the present invention provides a lighting device that can suppress a change in a light distribution shape due to a light diffusion unit while suppressing the occurrence of irradiation unevenness.

  In order to solve the above-described problem, one embodiment of a lighting device according to the present invention includes a light source, a first surface disposed on the light source side, and a second surface from which light incident from the first surface is emitted. A light-transmitting optical member for controlling light distribution of light incident from the light source, wherein the optical member totally reflects at least a part of the light incident from the light source, thereby forming an optical path of the light. The second surface is a control light area where the totally reflected light is emitted, and an area where the light that is not totally reflected is emitted, of the light incident on the total reflection section. A non-control light region, wherein at least a part of the non-control light region diffuses outgoing light more than at least a part of the control light region.

  ADVANTAGE OF THE INVENTION According to this invention, the illumination fixture which can suppress the change of the light distribution shape by a light-diffusion part, suppressing generation | occurrence | production of irradiation unevenness can be provided.

FIG. 1 is a perspective view illustrating an appearance of a lighting device according to an embodiment. FIG. 2 is an exploded perspective view of the lighting fixture according to the embodiment. FIG. 3 is a cross-sectional view of the lighting fixture according to the embodiment. FIG. 4 is a cross-sectional view schematically illustrating an optical path from a light source to the inside of an optical member in the lighting fixture according to the embodiment. FIG. 5 is a cross-sectional view illustrating an outline of an optical path inside the optical member in the lighting fixture according to the embodiment. FIG. 6 is a plan view showing a second surface of the optical member according to the embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Therefore, numerical values, shapes, materials, constituent elements, arrangement positions of constituent elements, connection forms, and the like shown in the following embodiments are merely examples and do not limit the present invention. Therefore, among the components in the following embodiments, components that are not described in independent claims that represent the highest concept of the present invention are described as arbitrary components.

  Each drawing is a schematic diagram, and is not necessarily strictly illustrated. In each of the drawings, substantially the same components are denoted by the same reference numerals, and redundant description will be omitted or simplified.

(Embodiment)
[1. overall structure]
First, the overall configuration of the lighting fixture according to the embodiment will be described with reference to FIGS.

  FIG. 1 is a perspective view showing an appearance of a lighting device 1 according to the present embodiment.

  FIG. 2 is an exploded perspective view of lighting device 1 according to the present embodiment.

  FIG. 3 is a cross-sectional view of lighting device 1 according to the present embodiment.

  In each drawing, a direction parallel to the optical axis J is defined as a y-axis direction, and two directions perpendicular to the optical axis J and orthogonal to each other are defined as a z-axis direction and an x-axis direction. In the present embodiment, the y-axis direction is a vertical direction.

  The lighting fixture 1 shown in FIGS. 1 to 3 is, for example, an embedded lighting fixture such as a downlight that illuminates light downward (floor, wall, or the like) by being buried in an attached portion such as a ceiling of a building. It is. In the present embodiment, the direction in which light is emitted from lighting device 1 (light emitting direction) is set to the front, and the direction opposite to the light emitting direction is set to the rear. That is, with reference to the ceiling surface on which the lighting fixture 1 is installed, the direction on the floor side (downward) from the ceiling surface is forward, and the direction above the ceiling surface (upper) is rearward. The negative side in the y-axis direction is the front, and the positive side in the y-axis direction is the rear.

  As shown in FIGS. 2 and 3, the lighting fixture 1 includes a fixture main body 10, a frame 20, a light source 30, a mounting member 32, a connecting member 36, a reflecting member 40, an optical member 50, and a tubular member 60. Hereinafter, each component of the lighting fixture 1 will be described.

[1-1. Instrument body]
The instrument body 10 is a member in which the light source 30 is disposed. In the present embodiment, the instrument body 10 is a mounting base to which the light source 30 is mounted. The appliance body 10 also functions as a heat sink for dissipating the heat generated by the light source 30. Therefore, the appliance main body 10 is preferably made of a material having a high thermal conductivity such as a metal material. The instrument body 10 is made of aluminum die-casting made of, for example, aluminum. As shown in FIG. 3, the device main body 10 includes a shade unit 11, a mounting unit 12, and a heat radiating unit 13.

  The mounting portion 12 is a trapezoidal portion to which the light source 30 is mounted. As shown in FIG. 3, a light source 30 is disposed in front of the mounting section 12, and a heat radiating section 13 is disposed behind the mounting section 12. Thereby, the heat generated by the light source 30 is efficiently transmitted to the heat radiating unit 13.

  The seed part 11 is a cylindrical part provided on the periphery of the mounting part 12 and surrounding the optical axis J of the light source 30. Outgoing light of the lighting fixture 1 is emitted from the front end of the sail 11. As shown in FIG. 3, a second locking portion 114 for locking the tubular member 60 is provided on the inner surface of the shade portion 11. In the present embodiment, second locking portion 114 is an annular groove formed on the inner surface of shade portion 11.

  The heat radiating portion 13 is a portion that dissipates heat generated by the light source 30 and includes a plurality of fins. The heat radiating portion 13 is formed on the rear side of the mounting portion 12.

[1-2. Frame]
The frame 20 is a member for attaching the instrument body 10 to an attached portion such as a ceiling. In the present embodiment, the frame 20 is a substantially cylindrical member that surrounds the shade portion 11 of the instrument body 10. As shown in FIGS. 2 and 3, the frame body 20 includes a mounting spring 25 on the outer peripheral surface. The attachment spring 25 is an elastic member for attaching the frame body 20 to a construction material, which is a portion to which the lighting fixture 1 is attached. In the present embodiment, three mounting springs 25 are provided on the outer peripheral surface of the frame 20.

  In the present embodiment, by changing the relative angle of the instrument body 10 with respect to the fixed frame 20, the emission direction of the emitted light from the instrument body 10 can be changed. That is, the lighting fixture 1 according to the present embodiment is a universal downlight.

  The frame 20 can be formed of, for example, a metal material such as aluminum.

[1-3. light source]
The light source 30 is a light emitting module, and is a light source that emits predetermined light radially. In the present embodiment, the light source 30 is a light emitting module having an LED. The light source 30 is configured to emit, for example, white light. The light source 30 includes a COB (Chip On Board) LED, and as shown in FIG. 2, a base 302, a plurality of blue LEDs 304 which are bare chips (LED chips) mounted on the base 302, and And a sealing member including a phosphor for sealing the LEDs 304. Note that, in the present embodiment, the sealing member collectively seals all the LEDs 304, but the configuration of the sealing member is not limited to this. A configuration in which the sealing member is formed in a plurality of lines along the arrangement direction of the LEDs 304 arranged in a line may be employed.

  The light source 30 is attached to the attachment section 12 of the instrument body 10. In the lighting fixture 1, the direction of the optical axis J of the light source 30 is the vertical direction (the y-axis direction in each drawing).

  The base 302 is a mounting substrate for mounting the plurality of LEDs 304, and is, for example, a ceramic substrate, a resin substrate, or a metal base substrate coated with insulation. The base 302 is, for example, a plate having a flat surface that is rectangular in plan view, and the bottom surface (rear surface) of the base 302 is attached to the attachment portion 12 of the instrument body 10. Note that the base 302 is formed with a pair of electrode terminals (a positive electrode terminal and a negative electrode terminal) for receiving DC power for causing the LED 304 (the light source 30) to emit light from the outside.

[1-4. Mounting member]
The attachment member 32 is a member for attaching the light source 30 to the attachment portion 12 of the instrument body 10. As shown in FIG. 2, the attachment member 32 includes a restriction portion 322 and a claw portion 324.

  The restricting unit 322 restricts the position of the light source 30 in the direction perpendicular to the optical axis J (x-axis direction and y-axis direction). The restricting portion 322 has a rectangular frame shape having an opening at the center. The opening formed in the center of the regulating portion 322 has a shape corresponding to the light source 30, and the light source 30 is arranged in the opening. The attachment member 32 is arranged on the surface (front side) of the attachment portion 12 on which the light source 30 is arranged, and is fixed to the attachment portion 12 by the connection member 36 and the screw 38 shown in FIG. More specifically, a through hole 326 is formed in the regulating portion 322 of the mounting member 32, and the screw 38 is screwed into a screw hole formed in the mounting portion 12 through the through hole 326, The mounting member 32 is fixed to the mounting portion 12. Thereby, the mounting member 32 and the light source 30 arranged in the opening thereof are fixed to the mounting portion 12.

  The claw-shaped portion 324 is a claw-shaped portion for supporting the reflecting member 40, and locks the locking hole 440 of the reflecting member 40 as shown in FIG. In the present embodiment, the attachment member 32 includes two claw-shaped portions 324. The claw portion 324 has a substantially L-shaped shape, and an inclined surface (projection) protruding away from the optical axis J at an end of the claw portion 324 is inserted into the locking hole 440. As a result, the claw 324 locks the locking hole 440.

  The attachment member 32 can be formed using, for example, a resin material such as polybutylene terephthalate (PBT) or polycarbonate.

[1-5. Connection member]
The connection member 36 is a member to which a wiring (not shown) for supplying a current to the light source 30 is connected. As shown in FIG. 2, the lighting fixture 1 according to the present embodiment includes two connection members 36, and one connection member 36 has a high potential side wiring, and the other connection member 36 has a low potential side wiring. Wirings are connected respectively. The connection member 36 is provided with an electrode (not shown) for supplying a current to the light source 30. The electrode is connected to an electrode terminal formed on the light source 30.

  The connection member 36 also has a function of regulating the position of the light source 30. The connecting member 36 is formed with a through hole through which a screw 38 penetrates, and the connecting member 36 is fixed to the mounting portion 12 and the mounting member 32 by the screw 38 inserted into the through hole. At this time, as shown in FIG. 3, the end of the connection member 36 on the optical axis J side presses the light source 30 toward the mounting portion 12, and thereby the position of the light source 30 in the optical axis J direction (y-axis direction). Regulate.

  The housing of the connection member 36 can be formed using, for example, a resin material such as PBT or polycarbonate. Further, the electrode of the connection member 36 can be formed using a conductive member such as copper.

[1-6. Reflective member]
The reflection member 40 is a member that controls the distribution of light from the light source 30. In the present embodiment, the reflecting member 40 reflects light from the light source 30 toward the optical member 50. As shown in FIG. 2, the reflection member 40 has a substantially cylindrical shape in which an opening through which the optical axis J passes is formed.

  As shown in FIG. 3, the reflection member 40 has an inner diameter from an end on the side where light from the light source 30 is incident (positive side in the y-axis direction) toward an end on the side where the light is emitted. It has a substantially cylindrical shape configured to become gradually larger. Light from the light source 30 is reflected on the inner surface of the reflection member 40.

  As shown in FIG. 3, a locking hole 440 that is locked to the claw-shaped portion 324 of the mounting member 32 is provided on the outer surface side of the reflection member 40. The locking hole 440 is a hole provided in a member erected on the outer surface side of the reflection member 40. The reflection member 40 is locked to the attachment member 32 by locking the locking hole 440 to the claw-shaped portion 324. Thereby, the reflection member 40 is attached to the attachment portion 12 of the instrument body 10 via the attachment member 32.

  As shown in FIG. 2, three claw-shaped portions 410 are provided at an end of the reflection member 40 on the light emission side. The claw portion 410 is a portion that locks the optical member 50.

  The reflection member 40 can be formed using a hard white resin material such as PBT. The reflection member 40 may be provided with a metal film such as aluminum on the inner surface.

[1-7. Optical member]
The optical member 50 is a light-transmitting optical member that controls light distribution of light incident from the light source 30. As shown in FIG. 3, the optical member 50 includes a first surface 510 disposed on the light source 30 side, and a second surface 520 from which light incident from the first surface 510 is emitted. The optical member 50 has a function of controlling the light distribution of light incident from the reflection member 40 and emitting the light. In the present embodiment, the optical member 50 is a Fresnel lens. The optical member 50 collects light incident from the first surface 510 and emits light having a substantially circular cross section from the second surface 520. In the present embodiment, the second surface 520 of the optical member 50 has a light diffusion configuration for suppressing irradiation unevenness. The light diffusion configuration will be described later.

  As shown in FIG. 2, three concave portions 530 are provided on the periphery of the optical member 50. In the present embodiment, the concave portion 530 is a portion provided on the second surface 520 of the optical member 50 and having a concave shape. The optical member 50 is locked to the reflection member 40 by locking the concave portion 530 of the optical member 50 to the claw portion 410 of the reflection member 40. Thus, the optical member 50 is attached to the attachment portion 12 of the instrument body 10 via the reflection member 40 and the attachment member 32. Further, by arranging the optical member 50 at the light emitting side end of the reflecting member 40, the light emitted from the reflecting member 40 is efficiently incident on the optical member 50.

  The optical member 50 is formed using a translucent material, and for example, can be formed using a transparent resin material such as PMMA (acryl) or polycarbonate, or a transparent material such as a glass material.

[1-8. Tubular member]
The tubular member 60 is a tubular member arranged on the inner surface of the shade part 11 as shown in FIG. The tubular member 60 has an entrance opening 610 through which light emitted from the optical member 50 enters, and an exit opening 620 through which light entering the entrance opening 610 exits. The tubular member 60 is disposed on the inner surface of the shade portion 11 of the instrument body 10 and on the second surface 520 side of the optical member 50.

  As shown in FIG. 3, the tubular member 60 is disposed near the front end of the shade 11 so that the emission opening 620 is located. The length of the cylindrical member 60 in the optical axis J direction (y-axis direction) is about the length from the second surface 520 of the optical member 50 to the front end of the shade portion 11. Thus, the tubular member 60 can cover a portion of the inner surface of the shade 11 from the vicinity of the second surface 520 of the optical member 50 to the vicinity of the front end of the shade 11. Here, the inner surface (the surface on the optical axis J side) of the tubular member 60 is a black glare suppressing surface. This suppresses glare in the inner surface of the shade portion 11 from near the second surface 520 of the optical member 50 to near the front end of the shade portion 11.

  The inner surface of the tubular member 60 is not particularly limited as long as it is a black glare suppressing surface. The black glare suppressing surface can be realized, for example, by performing a matting process on a surface painted black. Further, the black glare suppressing surface can also be realized by subjecting a surface painted black or a surface made of a black member to graining. Further, in order to further suppress glare on the inner surface of the tubular member 60, a step portion (baffle) may be provided on the inner surface of the tubular member 60.

  As shown in FIGS. 2 and 3, the cylindrical member 60 includes a second locked portion 660 on an outer surface. The tubular member 60 is held inside the instrument body 10 by the second locked portion 660 being locked by the second locking portion 114. In the present embodiment, second locked portion 660 is a plurality of convex portions, and second locked portion 114 is an annular groove formed on the inner surface of shade portion 11. With the above-described configuration, the tubular member 60 can be easily attached simply by inserting it into the shade portion 11.

  The tubular member 60 can be formed using, for example, a resin material such as polycarbonate and PBT.

[2. Light diffusion configuration in optical member]
Next, a light diffusion configuration on the second surface 520 of the optical member 50 according to the present embodiment will be described with reference to FIGS.

  FIG. 4 is a cross-sectional view schematically showing an optical path from light source 30 to the inside of optical member 50 in lighting apparatus 1 according to the present embodiment. A thick solid line and a thick dotted line shown in FIG. 4 indicate an optical path of light emitted from the light source 30. In FIG. 4, only the left half of the optical member 50 is shown.

  FIG. 5 is a cross-sectional view showing an outline of an optical path inside optical member 50 in lighting fixture 1 according to the present embodiment. FIG. 5 is an enlarged view of the inside of the two-dot chain line frame of FIG.

  FIG. 6 is a plan view showing the second surface 520 of the optical member 50 according to the present embodiment.

  As shown in FIG. 4, the optical member 50 according to the present embodiment is a Fresnel lens, and includes a refraction unit 502 that refracts light incident from the light source 30 to control the optical path of the light. Further, the optical member 50 includes a total reflection section 504 that totally reflects at least a part of the light incident from the light source 30 to control the optical path of the light.

  The refraction unit 502 refracts light similarly to a convex lens. In the present embodiment, the refraction unit 502 collects light by refracting light that radially spreads from the light source 30.

  The total reflection portion 504 is a portion having a sawtooth-shaped cross-sectional shape shown in FIG. 4, and has a concentric groove formed on the first surface 510. As shown in FIG. 5, in the total reflection section 504, the first surface 510 includes a plurality of incident surfaces 514 and a plurality of total reflection surfaces 516.

  As shown by the thick solid line in FIG. 5, most of the light incident on the incident surface 514 from the light source 30 is refracted on the incident surface 514 and then incident on the total reflection surface 516 from inside the optical member 50. . The light incident on the total reflection surface 516 is totally reflected by the total reflection surface 516, so that the optical path is controlled. In the present embodiment, light totally reflected by total reflection surface 516 propagates in a direction substantially parallel to optical axis J. As described above, most of the light incident on the total reflection unit 504 is controlled by the optical member 50 so as to propagate in a direction substantially parallel to the optical axis J. As described above, the light that reaches the second surface 520 after being incident on the total reflection portion 504 and totally reflected by the total reflection surface 516 is hereinafter referred to as control light. As shown in FIG. 5, a region of the second surface 520 from which the control light is emitted is referred to as a control light region 521. That is, the second surface 520 includes the control light region 521 from which the totally reflected light out of the light incident on the total reflection portion 504 is emitted.

  On the other hand, as shown by the thick dotted line in FIG. 5, some of the light incident on the incident surface 514 from the light source 30 is refracted on the incident surface 514 and then does not enter the total reflection surface 516, and the second The plane 520 is reached. The light that enters the total reflection unit 504 and exits from the second surface 520 without being totally reflected by the total reflection surface 516 is hereinafter referred to as non-control light. As shown in FIG. 5, the non-control light is generated in each of the concentric grooves formed by the total reflection surface 516 and the incident surface 514 of the optical member 50, and is appropriately collected by the optical member 50. And emit radially. Accordingly, when the non-control light is emitted without being diffused on the second surface 520, the non-control light is formed around the irradiation spot formed by the control light emitted from the lighting fixture 1 with the non-control light. Concentric uneven irradiation occurs. Therefore, in the conventional lighting fixture, all of the emitted light is diffused to suppress the irradiation unevenness. Note that, as shown in FIG. 5, a region of the second surface 520 from which the non-control light exits is referred to as a non-control light region 522. That is, the second surface 520 includes the non-control light region 522 from which the light that has not been totally reflected out of the light that has entered the total reflection unit 504 is emitted.

  In lighting device 1 according to the present embodiment, at least a portion of non-control light region 522 has a configuration in which emitted light is more diffused than at least a portion of control light region 521. In the present embodiment, as shown in FIG. 5, the non-control light region 522 includes a plurality of spherical concave portions 528 as light diffusion portions. Thereby, the non-control light is diffused, so that concentric irradiation unevenness is suppressed.

  On the other hand, a region other than the non-control light region 522 in the second surface 520 of the total reflection unit 504 includes a flat portion 526. That is, at least a part of the control light region 521 includes the flat portion 526 in which light diffusion is suppressed. Therefore, in the optical member 50 according to the present embodiment, as shown in FIG. 6, a plurality of concavities 528 are formed concentrically on the second surface 520, and the plurality of concavities 528 formed concentrically are formed. In the same manner, a flat portion 526 is formed concentrically. Accordingly, at least a part of the control light that does not need to be diffused is emitted from the second surface 520 without being substantially diffused. For this reason, it is possible to suppress a change in the light distribution shape due to the diffusion of the control light (a change in the ratio of the light emitted to the desired irradiation area in the total emitted light emitted from the lighting fixture 1). . Further, since mirror processing can be easily performed on the flat portion 526, light diffusion in the flat portion can be easily reduced.

  In the above embodiment, the concave portion 528 is provided in the entire non-control light region 522. That is, as shown in FIG. 6, the region where the concave portion 528 is formed coincides with the non-control light region 522. The concave portion 528 may not be provided in the entire non-control light region 522. For example, in the non-control light region 522, it may be provided only in a region where the intensity of the non-control light is particularly high. Thereby, the change of the light distribution shape due to the light diffusion unit can be further suppressed.

  Further, in the above-described embodiment, a configuration in which light is not substantially diffused in a region other than the non-control light region 522 is used. However, light may be diffused in a region other than the non-control light region 522. . At least a part of the non-control light region 522 should diffuse outgoing light more than at least a part of the control light region 521. For example, a concave portion 528 having a larger radius of curvature than concave portion 528 may be used instead of flat portion 526 of second surface 520 according to the present embodiment. As a result, in the region other than the non-control light region 522 of the second surface 520 in the total reflection portion 504, the emitted light is diffused smaller than the non-control light region 522. As a result, the control light is appropriately diffused, so that color unevenness of the control light generated by using a combination of the blue LED 304 and the phosphor as the light source 30 can be suppressed.

  Further, in the present embodiment, a spherical concave portion 528 is used as the light diffusing portion, but a spherical convex portion may be used. By using a spherical concave or convex portion as the light diffusing portion, it is possible to suppress illuminance unevenness without significantly lowering the central luminous intensity of the light emitted from the lighting device 1. Further, in the light diffusing portion including the spherical concave portion or the convex portion, the degree of light diffusion can be easily controlled and high reproducibility can be realized, as compared with the light diffusing portion formed by graining or the like. Further, since the spherical light diffusion portion is easy to process, the cost required for the process can be reduced. Also, when molding the shape of the light diffusing portion with a mold, when adopting a spherical shape as the shape of the light diffusing portion, it is more effective than adopting another shape (for example, a shape such as embossing). Mold wear can be suppressed.

  Note that the configuration of the light diffusion unit is not limited to a spherical concave or convex portion. For example, a concave portion or a convex portion having a shape other than the spherical shape may be used as the light diffusion portion. In addition, a facet-like shape obtained by combining minute planes may be used as the light diffusion unit. Further, a portion obtained by subjecting the second surface 520 to a graining process, a peening process, or the like may be used as a light diffusion portion, or a diffusion filter may be attached to the second surface 520 and used as a light diffusion portion.

  In the present embodiment, at least a part of the control light region 521 includes the flat portion 526 in which light diffusion is suppressed, so that at least a part of the control light is not substantially diffused. Therefore, it is possible to suppress a change in the light distribution shape due to the light diffusion unit of the lighting fixture 1. In addition, since mirror processing can be performed more easily on the flat portion than on a spherical portion or the like, light diffusion in the flat portion 526 can be easily reduced.

[3. Summary]
As described above, lighting device 1 according to the present embodiment includes light source 30, first surface 510 arranged on light source 30 side, and second surface 520 from which light incident from first surface 510 is emitted. And a translucent optical member 50 for controlling the light distribution of the light incident from the light source 30. The optical member 50 includes a total reflection unit 504 that totally reflects at least a part of the light incident from the light source 30 to control an optical path of the light. The second surface 520 includes a control light region 521 from which light totally reflected among the light incident on the total reflection portion 504 is emitted, and a non-control light region 522 from which light not totally reflected is emitted. . At least a portion of the non-control light region 522 diffuses outgoing light more than at least a portion of the control light region 521.

  Thereby, since at least a part of the non-control light is diffused, the occurrence of irradiation unevenness can be suppressed. In addition, since at least a part of the control light is diffused smaller than the non-control light, a change in the light distribution shape due to the light diffusion unit can be suppressed.

  Further, in lighting device 1 according to the present embodiment, non-control light region 522 may include a plurality of spherical concave portions or convex portions.

  Thereby, illuminance non-uniformity can be suppressed without significantly lowering the central luminous intensity of the light emitted from the lighting fixture 1. Further, in the light diffusing portion including the spherical concave portion or the convex portion, the degree of light diffusion can be easily controlled and high reproducibility can be realized, as compared with the light diffusing portion formed by graining or the like. Further, since the spherical light diffusion portion is easy to process, the cost required for the process can be reduced. Further, when the light diffusing portion is molded by a mold, when a spherical shape is employed, abrasion of the mold can be suppressed more than when a grained shape is employed.

  Further, in lighting device 1 according to the present embodiment, control light region 521 may include a flat portion.

  Accordingly, at least a part of the control light is emitted from the flat portion 526, and is not substantially diffused. Therefore, it is possible to suppress a change in the light distribution shape due to the light diffusion unit of the lighting fixture 1. In addition, since the flat portion 526 can be easily mirror-finished as compared with a spherical portion or the like, light diffusion in the flat portion 526 can be easily reduced.

  Further, in lighting device 1 according to the present embodiment, optical member 50 may be a Fresnel lens, and second surface 520 may have a plurality of concentric non-control light regions 522.

(Modifications, etc.)
As described above, the lighting fixture 1 according to the present invention has been described based on the embodiment, but the present invention is not limited to the above embodiment.

  For example, in the above embodiment, the optical member 50 is a Fresnel lens, but the optical member 50 is not limited to this. For example, a light-transmitting optical member that controls light distribution using total reflection, such as a hybrid lens, may be used.

  Further, in the above embodiment, the COB type LED is used as the light source 30, but other light emitting elements may be used. For example, an SMD (Surface Mount Device) type LED may be used. Further, another solid state light emitting element such as an organic EL (Electro Luminescence) element or a light source other than the solid state light emitting element may be used.

  In addition, a form obtained by performing various modifications that can be conceived by those skilled in the art to the embodiment, or realized by arbitrarily combining the components and functions in each embodiment without departing from the spirit of the present invention Embodiments are also included in the present invention.

Reference Signs List 1 lighting device 30 light source 50 optical member 504 total reflection portion 510 first surface 520 second surface 521 control light region 522 non-control light region 526 flat portion 528 concave portion J optical axis

Claims (3)

A light source,
A first surface disposed on the light source side, and a second surface from which light incident from the first surface is emitted, and a translucent optical member that controls light distribution of light incident from the light source. Prepare,
The optical member includes a total reflection unit that controls an optical path of the light by totally reflecting at least a part of light incident from the light source,
The second surface, out of the light incident on the total reflection portion, includes a control light region from which the totally reflected light is emitted, and a non-control light region from which the light that is not totally reflected is emitted,
At least a portion of the non-control light region, from at least a portion of the control light region, greatly diffuses outgoing light ,
The optical member is a Fresnel lens,
The lighting device , wherein the second surface has a plurality of the concentric non-control light regions . The lighting device according to claim 1, wherein the non-control light region includes a plurality of spherical concave portions or convex portions. The lighting device according to claim 1, wherein the control light region includes a flat portion.

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