BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or equivalent portions are denoted by the same reference numerals and the description thereof will not be repeated.
(Embodiment 1)
1 is a side view showing a lighting apparatus 1 according to Embodiment 1 of the present invention. 2 is a front view showing the lighting apparatus 1. Fig. Fig. 3 is a sectional view showing the luminaire main body 3 of the lighting apparatus 1. Fig.
As shown in Figs. 1 to 3, the lighting apparatus 1 is a plug-type spot light. The lighting apparatus 1 includes a lamp body 3, an arm 5, a plug unit 7, and a cord 9. The arm (5) holds the luminaire body (3). The arm 5 is rotatably connected to the plug unit 7 around the axis A1. Therefore, the luminaire body 3 is rotatable about the axis A1.
The plug unit 7 includes a power supply unit 8 for supplying an internal power supply voltage to the lamp body 3. The cord 9 connected to the power supply unit 8 is drawn out from the plug unit 7 and connected to the lamp body 3. The cord 9 supplies the internal power supply voltage generated by the power supply unit 8 to the lamp body 3. The plug unit (7) is mounted on the wiring duct (11). An external power supply voltage is supplied to the power supply unit 8 from the wiring duct 11. [ The power supply unit 8 generates an internal power supply voltage based on the external power supply voltage. The wiring duct 11 is elongated and fixed to a ceiling wall 13 such as a ceiling.
The luminaire body 3 is rotatable about the axis A2. The arm 5 holds the lamp body 3 so that the posture of the lamp body 3 is kept constant when the lamp body 3 is rotated and the posture of the lamp body 3 is determined. The lamp body 3 includes a light source 21, a reflecting member 23, a light source cover 25, a heat sink 27, and an exterior member 29.
The light source 21 emits light. The light source 21 includes a light emitting diode (LED) group 21a and a substrate 21b. The LED group 21a includes a plurality of LEDs. The LED group 21a forms a substantially circular or substantially polygonal area. The LED group 21a is mounted on the mount surface of the substantially circular or substantially polygonal substrate 21b. The LED group 21a is a COB (chip on board) type. The COB type is a type that forms a group of LEDs 21a by sealing a plurality of LEDs with phosphors. The LED group 21a may be a SMD (Surface Mount Device) type. In the SMD type, a LED chip is formed by making the LED and the phosphor unit into one unit, a plurality of LED chips are mounted on the mounting surface of the substrate 21b and electrically connected to the conductive pattern of the substrate 21b, Forming type. Instead of the LED group 21a, one LED may be mounted on the substrate 21b.
The reflecting member 23 is disposed between the light source 21 and the light source cover 25. The reflecting member 23 reflects the light emitted from the light source 21. The reflecting member 23 is a hollow, approximately cone-shaped, and has an opening 31 with a small diameter and an opening 33 with a large diameter. Each of the opening 31 and the opening 33 is substantially circular. A light source 21 is disposed in the vicinity of the opening 31 so as to be exposed through the opening 31. It is preferable that at least the inner surface of the reflecting member 23 is subjected to reflection processing such as white coating, silver coating, or glossy metallic plating in order to efficiently reflect the light emitted from the light source 21. The material of the reflecting member 23 may have a high color reflectance such as white or silver. For example, the reflecting member 23 is a reflecting mirror.
The light source cover 25 covers the opening 33 of the reflecting member 23. The light source cover 25 faces the light source 21 at regular intervals. The light source cover 25 transmits the light emitted from the light source 21 and the light reflected by the reflecting member 23 and emits the light toward the light irradiation area. The optical axis center line LA of the light source 21 intersects with the light source cover 25. The optical axis center line LA crosses the LED group 21a and passes through the center of the LED group 21a.
The heat sink 27 dissipates the heat emitted by the light source 21. Specifically, the back surface of the mounting surface of the substrate 21b of the light source 21 is in contact with the heat absorption surface of the heat sink 27. [ Accordingly, the heat emitted by the light source 21 is transmitted to the heat sink 27, and is dissipated by the heat sink 27. As a result, an abnormal temperature rise of the light source 21 can be suppressed. The heat sink 27 is formed of a material having high heat conductivity, and is preferably formed of, for example, a metal. Among the metals, it is preferable to be formed of, for example, aluminum or an aluminum alloy in consideration of ease of molding and lightening of the lighting apparatus 1. [
The exterior member 29 is substantially cylindrical in shape and has an opening 35 having a large diameter, a cutout 37, and an opening 39 having a small diameter. Each of the opening 35 and the opening 39 has a substantially circular shape. The exterior member 29 covers the reflective member 23, the side surface of the light source cover 25, and a part of the heat sink 27. The light source cover 25 is exposed through the opening 35. The heat sink 27 is exposed from the cutout portion 37 and the opening portion 39. Therefore, the heat radiation effect of the heat sink 27 can be improved. The arm 5 holds a portion of the heat sink 27 which is exposed from the notch 37.
The light source cover 25 will be described with reference to Figs. 4 to 8. Fig. 4 is a sectional view showing the light source cover 25. Fig. 4 shows a sectional view taken along the line IV-IV in Fig. 5 is a plan view showing the light source cover 25 from the light output side. 6 is a perspective view showing the light source cover 25 from the light exit side. 7 is a plan view showing the light source cover 25 from the light incidence side. 8 is a perspective view showing the light source cover 25 from the light incidence side.
4 to 8, the light source cover 25 includes a louver portion 60, a first transmitting portion 65 (transmitting portion), and a flange portion 80. [ The louver portion 60, the first transmissive portion 65 and the flange portion 80 are integrally molded to form the light source cover 25. Therefore, according to the first embodiment, it is possible to suppress an increase in the number of components of the lighting apparatus 1 as compared with the case where the light source cover and the louver are individual members. In addition, the number of assembling steps of the lighting apparatus 1 can be reduced. In addition, the glare (i.e., glare) and / or flare (i.e., weak unnecessary light) can be reduced by the louver portion 60.
The light source cover 25 has, for example, a transparent color or translucent color. The light source cover 25 is formed of, for example, synthetic resin (for example, acrylic or polycarbonate) or glass.
The first transmitting portion 65 has a substantially disc shape. The optical axis center line LA crosses the center of the first transmitting portion 65. [ The first transmitting portion 65 transmits light. Specifically, the first transmitting portion 65 transmits the direct light from the light source 21 and the reflected light from the reflecting member 23. The direct light is the light that the light source 21 emits and reaches the light source cover 25 without being reflected. The reflected light is the light emitted from the light source 21, reflected by the reflecting member 23, and reaches the light source cover 25.
The flange portion 80 is a substantially annular flat plate. The outer diameter and the inner diameter of the flange portion 80 are larger than the outer diameter of the first transmitting portion 65, respectively. The first transmissive portion 65 is recessed into the side of the light source 21 with respect to the flange portion 80 and formed at a position closer to the light source 21 than the flange portion 80.
The louver portion 60 is formed between the first transmitting portion 65 and the flange portion 80. The louver portion 60 reduces glare and / or flare caused by the direct light from the light source 21 and the reflected light from the reflecting member 23.
The louver portion 60 has a substantially hooked shape in section. Specifically, the louver portion 60 includes a first tubular wall portion 51 (first wall portion or wall portion), a second tubular wall portion 52 (second wall portion or wall portion), a second transmissive portion 53 .
The second transmitting portion 53 is a substantially annular flat plate and is formed between the first tubular wall portion 51 and the second tubular wall portion 52. The second transmissive portion 53 transmits light. Specifically, the second transmitting portion 53 transmits the direct light from the light source 21 and the reflected light from the reflecting member 23. For example, the second transmitting portion 53 transmits the reflected light L0 from the reflecting member 23 and emits the reflected light L0 toward the light irradiation region. The reflected light L0 is, for example, approximately parallel to the optical axis center line LA. Therefore, by providing the second transmitting portion 53, it is possible to emit the reflected light L0 effectively for illumination, so that the light emitted from the light source 21 can be efficiently used. The light transmittance of the second transmissive portion 53 is substantially equal to the light transmittance of the first transmissive portion 65.
In this specification, the light transmittance means the ratio (T1 / T0) of the intensity T0 of the incident light to the object and the intensity T1 of the emitted light from the object.
The first tubular wall portion 51 is substantially cylindrical. In the first tubular wall portion 51 and the first transmitting portion 65, a cylindrical body having a bottom is formed. The first tubular wall portion 51 extends from the outer edge of the first transmitting portion 65 toward the light source 21 so as to be away from the flange portion 80. The first tubular wall portion 51 extends along the optical axis center line LA. The first tubular wall portion 51 is formed around the optical axis center line LA opposite to the optical axis center line LA.
The light transmittance of the first tubular wall portion 51 is smaller than that of the first transmissive portion 65. Specifically, the first cylindrical wall portion 51 includes a wall body 41, a first light control portion 42 (light control portion), a second light control portion 43 (light control portion) (Light control unit).
The wall body 41 is substantially cylindrical. The light transmittance of the wall body 41 is substantially equal to the light transmittance of the first transmissive portion 65.
The first light control part 42 is formed on the inner wall surface (wall surface) of the wall body 41. [ The inner wall surface of the wall body 41 is a wall surface of the wall body 41 on which light enters the light source cover 25. [ The first light control part 42 reduces the intensity of light transmitted through the wall body 41 so that the light transmittance of the first cylindrical wall part 51 becomes smaller than the light transmittance of the first transmissive part 65. [ Specifically, the first light control unit 42 diffuses the light incident on the wall body 41 out of the light (for example, direct light L1) incident on the first light control unit 42, The intensity of the light transmitted through the wall body 41 of the light (for example, the direct light L1) incident on the control section 42 is adjusted so that the intensity of the light transmitted through the first transmitting section 65 of the direct light from the light source 21 . Therefore, the glare and / or flare caused by the direct light L1 can be reduced by the first light control unit 42, for example. The direct light L1 is light that is emitted from the light source 21 and meanders to the optical axis center line LA. The direct light L1 in the present embodiment is light that reaches the light source cover 25 in the direction indicated by the arrow in the drawing and reaches the light source cover 25 directly from the light source 21 The light is mostly occupied, but also the light reflected by the reflecting member 23 may be included.
The first light control section 42 passes through the wall body 41 and passes through the first light control section 42 so that the light transmittance of the first cylindrical wall section 51 becomes smaller than the light transmittance of the first transmissive section 65 The light intensity of the light emitted from the light source is reduced. Further, the first light control unit 42 scatters light emitted from the first light control unit 42 through the wall body 41. [ Therefore, the glare and / or flare can be further reduced by the first light control unit 42. [
In this specification, the intensity of light is represented, for example, by the luminous flux per unit area.
The second light control portion 43 is formed on the outer wall surface (wall surface) of the wall body 41. [ The outer wall surface of the wall body 41 is a wall surface of the wall body 41 on the side from which light is emitted from the light source cover 25. [ The second light control section 43 controls the amount of light incident on the second light control section 43 such that the light transmittance of the first cylindrical wall section 51 becomes smaller than the light transmittance of the first transmissive section 65, The intensity of the light transmitted through the wall body 41 in the reflected light L2 is reduced. Therefore, the glare and / or the flare caused by the reflected light L2 can be reduced by the second light control section 43, for example. The reflected light L2 is light that is emitted from the light source 21 and is reflected by the reflecting member 23 and meanders to the optical axis center line LA.
The second light control section 43 passes through the wall body 41 so as to make the light transmittance of the first cylindrical wall section 51 smaller than the light transmittance of the first transmissive section 65, The light intensity of the light emitted from the light source is reduced. Further, the second light control section 43 scatters light emitted from the second light control section 43 through the wall body 41. [ Therefore, by providing the second light control section 43, glare and / or flare can be further reduced.
The third light control section 44 is formed on the end wall surface (wall surface) far from the light source 21 out of the two end wall surfaces opposed to each other of the wall body 41. The end wall surface is the end surface of the wall body 41. The third light control section 44 is configured to pass through the wall main body 41 and to pass through the third light control section 44 from the third light control section 44 so that the light transmittance of the first cylindrical wall section 51 becomes smaller than the light transmittance of the first transmission section 65 Thereby reducing the intensity of emitted light. Further, the third light control unit 44 scatters light emitted from the third light control unit 44 through the wall body 41. [ Therefore, the glare and / or the flare can be further reduced by the third light control unit 44. [
The second tubular wall portion 52 is substantially cylindrical. The second tubular wall portion 52 extends from the inner edge of the flange portion 80 toward the light source 21. The second tubular wall portion 52 extends along the optical axis center line LA. The second tubular wall portion 52 is formed around the first tubular wall portion 51 in opposition to the first tubular wall portion 51. The inner diameter of the second tubular wall portion (52) is larger than the outer diameter of the first tubular wall portion (51).
The light transmittance of the second tubular wall portion 52 is smaller than the light transmittance of the first transmissive portion 65. Specifically, the second tubular wall portion 52 includes a wall body 48, A fourth light control unit 45 (light control unit), a fifth light control unit 46 (light control unit), and a sixth light control unit 47 (light control unit).
The wall body 48 is substantially cylindrical. The light transmittance of the wall body 48 is substantially equal to the light transmittance of the first transmissive portion 65.
The fourth light control portion 45 is formed on the inner wall surface (wall surface) of the wall body 48. [ The inner wall surface of the wall body 48 is a wall surface of the wall body 48 on the side from which light is emitted from the light source cover 25. [ The fourth light control unit 45 controls the amount of light incident on the fourth light control unit 45 so that the light transmittance of the second tubular wall unit 52 becomes smaller than the light transmittance of the first transmissive unit 65 (L3)) of the wall body (48). Therefore, the glare and / or flare caused by the direct light L3 can be reduced by the fourth light control unit 45, for example. The direct light L3 is the same light as the direct light L1.
The fourth light control unit 45 also reduces the intensity of the light that passes through the wall body 48 and is emitted from the fourth light control unit 45. [ Further, the fourth light control unit 45 scatters light emitted from the fourth light control unit 45 through the wall body 48. Therefore, the glare and / or flare can be further reduced by the fourth light control unit 45. [
The fifth light control unit 46 is formed on the outer wall surface (wall surface) of the wall body 48. [ The outer wall surface of the wall body 48 is a wall surface of the wall body 48 on the side where the light source cover 25 receives light. The fifth light control part 46 reduces the intensity of light transmitted through the wall body 48 so that the light transmittance of the second tubular wall part 52 becomes smaller than the light transmittance of the first transmissive part 65. [ Specifically, the fifth light control unit 46 adjusts the intensity of the light transmitted through the wall body 48 among the light (for example, the reflected light L4) incident on the fifth light control unit 46 to the reflection member 23 Of the reflected light from the first transmissive portion (65). Therefore, the fifth light control unit 46 can reduce glare and / or flare caused by, for example, the reflected light L4. The reflected light L4 is the same light as the reflected light L2.
The fifth light control unit 46 is further provided with a fourth light control unit 46 which passes through the wall body 48 so that the light transmittance of the second cylindrical wall unit 52 becomes smaller than the light transmittance of the first transmission unit 65, The light intensity of the light emitted from the light source is reduced. Further, the fifth light control unit 46 scatters light emitted from the fifth light control unit 46 through the wall body 48. [ Therefore, the glare and / or the flare can be further reduced by the fifth light control unit 46. [
The sixth light control unit 47 is formed on the end wall surface (wall surface) farther from the light source 21 out of the two end wall surfaces opposed to each other of the wall main body 48. The end wall surface is a cross-section of the wall main body 48. The sixth light control unit 47 passes through the wall body 48 and reaches the sixth light control unit 47 from the sixth light control unit 47 so that the light transmittance of the second cylindrical wall 52 becomes smaller than the light transmittance of the first transmission unit 65 Thereby reducing the intensity of emitted light. Further, the sixth light control unit 47 scatters the light emitted from the sixth light control unit 47 through the wall main body 48. Therefore, the glare and / or flare can be further reduced by the sixth light control unit 47. [
As described above with reference to Figs. 4 to 8, according to the first embodiment, the light source cover 25 has the first tubular wall portion 51 extending along the optical axis center line LA. The first tubular wall portion 51 is formed of the first tubular wall portion 51 and the second tubular wall portion 51. The first tubular wall portion 51 is formed of the first tubular wall portion 51 and the second tubular wall portion 51, L2) from being emitted from the light source cover 25 toward the light irradiation area. As a result, glare and / or flare can be suppressed. The light transmittance of the first tubular wall portion 51 is smaller than the light transmittance of the first transmissive portion 65. The first tubular wall portion 51 is configured such that reflected light that meanders with respect to the direct light and the optical axis center line LA that meander with respect to the optical axis center line LA is emitted from the light source cover 25 toward the light irradiation area . As a result, glare and / or flare can be further suppressed. The light control sections (the first light control section 42 to the third light control section 44) are provided on both sides of the light source cover 25 on which light is incident and on the light output side from the light source cover 25 . Therefore, glare and / or flare can be further suppressed.
In addition, according to Embodiment 1, the light source cover 25 further has a second tubular wall portion 52 extending along the optical axis center line LA in addition to the first tubular wall portion 51. Since the second tubular wall portion 52 has the same configuration and function as the first tubular wall portion 51, glare and / or flare can be further suppressed.
According to Embodiment 1, the light source cover 25 has the first tubular wall portion 51 and the second tubular wall portion 52 in addition to the first transmitting portion 65 and the flange portion 80 . Therefore, the light source cover 25 can be formed by integrally molding the first transmissive portion 65, the flange portion 80, the first tubular wall portion 51, and the second tubular wall portion 52. As a result, as compared with the case where the light source cover and the louver are individual members, an increase in the number of parts of the lighting apparatus 1 can be suppressed, and the number of assembling steps of the lighting apparatus 1 can be reduced.
Next, the second light control section 43 to the sixth light control section 47 will be described with reference to Figs. 5, 6, and 9. Fig. Fig. 9 is an enlarged view of the area B1 in Fig.
As shown in Figs. 5, 6, and 9, the second light control section 43 has a concavo-convex shape. Specifically, the second light control section 43 includes a plurality of convex portions 71. Each of the plurality of convex portions 71 is substantially triangular in cross section and extends along the optical axis center line LA. That is, each of the plurality of convex portions 71 extends along the direction in which the first cylindrical wall portion 51 extends. The plurality of convex portions 71 are formed to be substantially parallel to each other. That is, the plurality of convex portions 71 are arranged along the circumferential direction of the first tubular wall portion 51. In Fig. 6, the convex portion 71 is omitted for the sake of simplicity.
The third light control unit 44 has a concavo-convex shape. Specifically, the third light control unit 44 includes a plurality of convex portions 72. [ Each of the plurality of convex portions 72 is substantially triangular in cross section. Each of the plurality of convex portions 72 extends along the radial direction of the first transmitting portion 65. That is, each of the plurality of convex portions 72 extends along a direction substantially perpendicular to the optical axis center line LA. The plurality of convex portions 72 are formed to be substantially parallel to each other. That is, the plurality of convex portions 72 are arranged along the circumferential direction of the first cylindrical wall portion 51.
The fourth light control unit 45 has a concavo-convex shape. Specifically, the fourth light control unit 45 includes a plurality of convex portions 73. [ Each of the plurality of convex portions 73 is substantially triangular in cross section and extends along the optical axis center line LA. That is, each of the plurality of convex portions 73 extends along the direction in which the second cylindrical wall portion 52 extends. The plurality of convex portions 73 are formed to be substantially parallel to each other. That is, the plurality of convex portions 73 are arranged along the circumferential direction of the second cylindrical wall portion 52.
The fifth light control unit 46 has a concavo-convex shape. Specifically, the fifth light control unit 46 includes a plurality of convex portions 74. [ Each of the plurality of convex portions 74 is substantially triangular in cross section and extends along the optical axis center line LA. That is, each of the plurality of convex portions 74 extends along the direction in which the second tubular wall portion 52 extends. The plurality of convex portions 74 are formed to be substantially parallel to each other. That is, the plurality of convex portions 74 are arranged along the circumferential direction of the second cylindrical wall portion 52.
The sixth light control unit 47 has a concavo-convex shape. Specifically, the sixth light control unit 47 includes a plurality of convex portions 75. Each of the plurality of convex portions 75 is substantially triangular in cross section. Each of the plurality of convex portions 75 extends along the radial direction of the first transmitting portion 65. That is, each of the plurality of convex portions 75 extends along a direction substantially perpendicular to the optical axis center line LA. The plurality of convex portions 75 are formed to be substantially parallel to each other. That is, along the circumferential direction of the second tubular wall portion 52.
The first light control unit 42 will be described with reference to Figs. 7, 8, and 10. Fig. FIG. 10 is an enlarged view of the region B2 in FIG.
As shown in Figs. 7, 8, and 10, the first light control section 42 has a concavo-convex shape. Specifically, the first light control unit 42 includes a plurality of convex portions 70. [ Each of the plurality of convex portions 70 is substantially triangular in cross section and extends along the optical axis center line LA. That is, each of the plurality of convex portions 70 extends along the direction in which the first cylindrical wall portion 51 extends. The plurality of convex portions 70 are formed to be substantially parallel to each other. That is, the plurality of convex portions 70 are arranged along the circumferential direction of the first cylindrical wall portion 51.
As described above with reference to Figs. 5 to 10, according to the first embodiment, the first light control section 42 to the third light control section 44 and the second tubular wall section (first light control section) of the first tubular wall section 51 The fourth light control unit 45 to the sixth light control unit 47 of the second light control unit 52 have a concavo-convex shape. Accordingly, since the light can be scattered or diffused effectively, the light transmittance of the first cylindrical wall portion 51 can be easily reduced. As a result, glare and / or flare can be further suppressed.
The first light control section 42 and the second light control section 43 each have a convex portion 70 extending in the direction in which the first cylindrical wall portion 51 extends and a convex portion The fourth light control unit 45 and the fifth light control unit 46 each include a convex portion 73 extending along the direction in which the second tubular wall portion 52 extends, (74). Therefore, the light source cover 25 can be molded integrally with the first light control unit 42 to the sixth light control unit 47 by a mold. As a result, the first light control unit 42, the second light control unit 43, the fourth light control unit 45, and the fifth light control unit 46 are formed by post processing such as blast processing or painting processing The number of manufacturing steps of the light source cover 25 can be reduced.
That is, when the direction in which the metal mold is withdrawn substantially coincides with the direction in which the first tubular wall portion 51 and the second tubular wall portion 52 extend, the convex portion 70, the convex portion 71, the convex portion 73 And the convex portion 74 are designed to extend along the direction in which the first tubular wall portion 51 and the second tubular wall portion 52 extend, the convex portion 70, the convex portion 71, The convex portion 73, and the convex portion 74 can be formed. As a result, the light source cover 25 can be formed simultaneously with the first to sixth light control sections 42 to 47 by the mold.
Next, the arrangement of the second cylindrical wall portion 52 will be described with reference to Fig. 11 is a sectional view showing the arrangement of the second tubular wall portion 52. Fig. As shown in Fig. 11, the LED group 21a forms a light-emitting surface 24. As shown in Fig. The LED group 21a emits, for example, light LN1, light LN2, light LN3, and light LN4.
The light LN1 is incident on the straight line connecting the first end portion 26U (upper end portion in the drawing) of the light emitting surface 24 and the opening projection 30 of the opening portion 35 with direct light emitted from the first end portion 26U . The light LN2 represents direct light emitted from the second end 26L on a straight line connecting the second end 26L (the lower end in the figure) of the light emitting surface 24 and the opening edge 30. The light LN3 represents direct light emitted from the first end portion 26U so as to pass outside the second tubular wall portion 52. [ The light LN4 indicates direct light emitted from the second end portion 26L so as to pass through the outside of the second tubular wall portion 52. [ The first end 26U and the second end 26L are opposed to each other. The first end 26U shows one end along the direction substantially orthogonal to the optical axis center line LA on the light emitting surface 24. [ The second end portion 26L shows the other end portion in the light emitting surface 24 along a direction substantially perpendicular to the optical axis center line LA.
The second tubular wall portion 52 is disposed on a straight line connecting the first end portion 26U and the opening edge 30 as well as on a straight line connecting the second end portion 26L and the opening edge 30 . Thus, the light LN1 and the light LN2 pass through the second tubular wall portion 52 and are scattered. As a result, it is possible to reduce the glare when the luminaire 3 is seen from the direction in which the person HM is inclined. Further, the light LN3 is reflected on the inner surface of the exterior member 29, and the light LN4 is reflected on the reflection member 23. Therefore, the lights LN3 and LN4 are not emitted toward the person HM located in the tilted direction. As a result, the possibility of occurrence of glare is small.
(Embodiment 2)
Referring to Figs. 1, 12, and 13, the lighting apparatus 1 according to the second embodiment of the present invention will be described. Fig. As shown in Figs. 1, 12 and 13, the lighting apparatus 1 according to the second embodiment includes a light source cover 25A instead of the light source cover 25 according to the first embodiment. The light source cover 25A according to Embodiment 1 having two wall portions (the first cylindrical wall portion 51 and the second cylindrical wall portion 52) in that the light source cover 25A has one wall portion, (25). Hereinafter, the difference between the second embodiment and the first embodiment will be mainly described.
12 is a sectional view showing a light source cover 25A of the lighting apparatus 1 according to the second embodiment. 13 is a perspective view showing the light source cover 25A from the light incidence side.
The light source cover 25A transmits the light emitted from the light source 21 and the light reflected by the reflecting member 23 and emits the light toward the light irradiation area. The light source cover 25A faces the light source 21 at regular intervals. The optical axis center line LA of the light source 21 crosses the light source cover 25A.
The light source cover 25A is approximately hat-shaped. The light source cover 25A includes a louver portion 60 and a first transmissive portion 65 (hereinafter referred to as a transmissive portion 65) and a flange portion 80. [ The louver portion 60, the transmitting portion 65 and the flange portion 80 are integrally molded to form the light source cover 25A. The light source cover 25A is formed of the same color and material as the light source cover 25.
The louver portion 60 is formed between the transmitting portion 65 and the flange portion 80. The louver portion 60 reduces glare and / or flare caused by the direct light from the light source 21 and the reflected light from the reflecting member 23.
The louver portion 60 includes a third tubular wall portion 86 (first wall portion or wall portion). The third tubular wall portion 86 is substantially cylindrical. The third tubular wall portion 86 is formed between the transmitting portion 65 and the flange portion 80. The third tubular wall portion 86 extends from the outer edge of the transmissive portion 65 toward the inner edge of the flange portion 80. The third tubular wall portion 86 extends along the optical axis center line LA. The third cylindrical wall portion 86 is formed around the optical axis center line LA opposite to the optical axis center line LA. The arrangement of the third tubular wall portion 86 is the same as that of the second tubular wall portion 52 described with reference to Fig.
The light transmittance of the third tubular wall portion 86 is smaller than the light transmittance of the transmissive portion 65. Specifically, the third tubular wall portion 86 includes a seventh light control portion 81 (light control portion), an eighth light control portion 82 (light control portion), a ninth light control portion 83 (light control portion) A tenth light control unit 84 (light control unit), and a wall body 85. [
The wall body 85 is substantially cylindrical. The light transmittance of the wall body 85 is substantially equal to the light transmittance of the transmissive portion 65.
The seventh light control unit 81 is formed on the inner wall surface (wall surface) of the wall body 85. The inner wall surface of the wall body 85 is a wall surface of the wall body 85 on the side from which light is emitted from the light source cover 25A. The configuration and functions of the seventh light control unit 81 are the same as those of the fourth light control unit 45 related to the first embodiment. Therefore, the glare and / or flare can be reduced by the seventh light control unit 81. [ For example, the seventh light control section 81 has a concavo-convex shape and includes the convex portion that is the same as the convex portion 73 related to the first embodiment.
The eighth light control unit 82 is formed on the end wall surface (wall surface) farther from the light source 21 out of the two end wall surfaces opposed to each other of the wall body 85. The end wall surface is a cross-section of the wall body 85. The configuration and function of the eighth optical control unit 82 are the same as those of the sixth optical control unit 47 related to the first embodiment. Therefore, the glare and / or flare can be further reduced by the eighth light control unit 82. [ For example, the eighth light control unit 82 has a concavo-convex shape and includes convex portions that are the same as the convex portions 75 related to the first embodiment.
The ninth optical control unit 83 is formed on the outer wall surface (wall surface) of the wall body 85. The outer wall surface of the wall body 85 is a wall surface of the wall body 85 on which light enters the light source cover 25A. The configuration and function of the ninth optical control unit 83 are the same as those of the fifth optical control unit 46 related to the first embodiment. Therefore, the glare and / or flare can be further reduced by the ninth light control unit 83. [ For example, the ninth light control section 83 has a concavo-convex shape and includes convex portions that are the same as the convex portions 74 related to the first embodiment.
The tenth optical control unit 84 is formed on an end wall surface (wall surface) close to the light source 21 out of the two end wall surfaces opposed to each other of the wall body 85. The end wall surface is a cross-section of the wall body 85. The tenth optical control unit 84 reduces the intensity of the light transmitted through the wall body 85 so that the light transmittance of the third tubular wall 86 becomes smaller than the light transmittance of the transmissive portion 65. Specifically, the tenth light control unit 84 controls the intensity of light transmitted through the wall body 85 among the light incident on the tenth light control unit 84 to transmit through the transmission unit 65 in the direct light from the light source 21 The intensity of the light is reduced. Therefore, the glare and / or the flare can be reduced by the tenth optical control unit 84. [ The tenth optical control unit 84 has a concavo-convex shape and includes, for example, convex portions that are the same as the convex portions 75 of the sixth optical control unit 47 related to the first embodiment.
As described above with reference to Figs. 12 and 13, according to the second embodiment, by providing the third tubular wall portion 86 in the light source cover 25A, the glare or the flare can be reduced , The increase in the number of parts of the lighting apparatus 1 can be suppressed. In addition, the second embodiment has the same effect as the first embodiment.
The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above-described embodiments, and can be carried out in various modes without departing from the gist (for example, (1) to (9) shown below). In addition, it is possible to form various inventions by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some constituent elements may be deleted from all the constituent elements shown in the embodiment. Further, the constituent elements according to other embodiments may be appropriately combined. In order to make it easy to understand, each figure is schematically shown as a subject, and the thickness, length, number, interval, and the like of each of the illustrated elements may be different from the actual one . The materials, shapes, dimensions, and the like of the respective components shown in the above embodiments are merely examples and are not particularly limited, and various modifications can be made without departing from the effect of the present invention.
(1) The light control sections (the first light control section 42 to the sixth light control section 47, the seventh light control section 81 to the tenth light control section 84) (75). However, the light control unit may have a convex portion or a concavo-convex shape different from the convex portions according to Embodiment 1 and Embodiment 2. [ For example, the convex portion may extend in an arbitrary direction. For example, the light control portion is formed by making the surface roughness of the wall surface larger than the surface roughness of the first transmitting portion 65.
(2) The light control sections (the first light control section 42 to the sixth light control section 47, the seventh light control section 81 to the tenth light control section 84) have a concavo-convex shape, Or may have a light reflectance higher than the light reflectance of the first transmissive portion 65, as well as the concavo-convex shape. In this case, the light can be effectively reflected, so that the light transmittance of the first tubular wall portion 51 and the second tubular wall portion 52 can be easily reduced. As a result, glare and / or flare can be further suppressed.
For example, the light control unit may be formed by coating a white paint on a wall surface, forming a white film on a wall surface, or coating a wall surface with a paint causing mirror reflection, And then performing the above process. As a result, the light control unit blocks light.
The light control portion may have a light absorption rate larger than the light absorption rate of the first transmission portion 65 in place of or in addition to the concavo-convex shape. In this case, light can be effectively absorbed, so that the light transmittance of the first tubular wall portion 51 and the second tubular wall portion 52 can be easily reduced. As a result, glare and / or flare can be further suppressed.
For example, the light control section can be formed by applying a black paint to the wall surface, or by forming a black film on the wall surface. As a result, the light control unit blocks light.
In the present specification, the light reflectance is a ratio of light reflected by an object to light incident on the object. The light absorption rate is a ratio of light absorbed by an object to light incident on the object.
(3) The light source cover 25 or the light source cover 25A may be rotated by about 180 degrees with respect to the light source 21. That is, the side on which light is emitted and the side on which light is incident may be reversed from the first and second embodiments.
(4) The wall portions (the first tubular wall portion 51, the second tubular wall portion 52 and the third tubular wall portion 86) surround the optical axis center line LA and are substantially cylindrical. However, a part of the wall portion may be cut to form a cutout portion. For example, the wall portion may be approximately semi-cylindrical or substantially circular in cross section. In this case, the lighting device 1 (for example, the lighting device 1) is arranged such that the wall portion faces the side where the person may be present (for example, the bottom side of the building) ). Further, the wall portion is not limited to a substantially cylindrical shape, and may be, for example, an approximately elliptical cross section.
(5) The lighting apparatus 1 is a spot light, but it may be any lighting apparatus. For example, the light source cover 25 or the light source cover 25A can be mounted on a lighting apparatus as a down light.
(6) In Embodiment 1, the first transmitting portion 65 and the flange portion 80 may be arranged so as to be substantially flat. The first transmissive portion 65 may be arranged so as to protrude from the flange portion 80. Further, the flange portion 80 may not be provided.
(7) In Embodiment 1, the louver portion 60 may have at least one of the first to sixth light control portions 42 to 47. [ For example, the louver portion 60 may have a first light control portion 42 and a fifth light control portion 46 formed on the wall surface of the light source cover 25 on which light is incident, The second optical control unit 43, the third optical control unit 44, the fourth optical control unit 45 and the sixth optical control unit 47 formed on the wall surface of the side from which the light is emitted from the second optical control unit 25.
Further, in Embodiment 1, the louver portion 60 may have an eleventh light control portion (light control portion). The eleventh light control section is formed on the end wall surface (wall surface) of the wall body 41 opposite to the third light control section 44. [ The end wall surface is the end surface of the wall body 41. Further, the louver unit 60 may have a twelfth light control unit (light control unit). The twelfth light control portion is formed on the end wall surface (wall surface) facing the sixth light control portion 47 in the wall body 48. [ The end wall surface is a cross-section of the wall main body 48. The configurations and functions of the eleventh light control unit and the twelfth light control unit are the same as those of the tenth light control unit 84 related to the second embodiment.
In the second embodiment, the louver unit 60 may have at least one of the seventh light control unit 81 to the tenth light control unit 84. [
(8) In the first embodiment, the louver section 60 does not need to have the first to sixth light control sections 42 to 47. In the second embodiment, 7 light control unit 81 to the tenth light control unit 84 may be omitted. In these cases, the first tubular wall portion 51, the second tubular wall portion 52, and the third tubular wall portion 86 are arranged so as to be parallel to the optical axis center line LA, The light reflected from the light source cover 25 is prevented from being emitted toward the light irradiation area. As a result, glare and / or flare can be suppressed.
(9) Although two wall portions (the first cylindrical wall portion 51 and the second cylindrical wall portion 52) are provided in Embodiment 1, three or more wall portions may be provided.
