JP7024399B2 - Light source unit and lighting equipment - Google Patents

Description

The present invention relates to a light source unit and a luminaire.

Generally, the range from the horizontal plane of the luminaire to 30 degrees is called a glare zone. If there is a bright light source in the glare zone, the user generally tends to feel glare. In order to prevent unpleasant glare, it may be required to suppress light in a light distribution angle range of 60 ° to 90 ° in a luminaire. Regarding this, Patent Document 1 discloses a lighting fixture capable of controlling light distribution.

JP-A-2015-162445

However, the luminaire of Patent Document 1 can only control glare in the lateral direction of the luminaire. Further, in a lighting fixture, it is conceivable to control the light distribution by using a louver. In this case, the size of the device can be large.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a light source unit and a lighting fixture capable of suppressing glare in the lateral direction and the longitudinal direction of the lighting fixture.

The light source unit according to the present disclosure is a substrate, a light source provided on the first surface of the substrate , a cover provided in the light emission direction of the light source, and a part of the cover, and the first surface thereof. The bottom surface prism portion comprises a bottom surface prism portion provided to face each other, the bottom surface prism portion having a plurality of first convex portions projecting to the opposite side of the first surface to provide a first slope, and the cover comprises: The side prism portions are provided on both sides of the light source, and the side prism portions have a plurality of second convex portions that project toward the inside of the cover and provide a second slope .

In the light source unit according to the present invention, the light distribution is controlled by a plurality of first convex portions. As a result, glare can be suppressed in the lateral direction and the longitudinal direction of the luminaire.
In the light source unit according to the present invention, the light distribution is controlled by a plurality of second convex portions. As a result, glare can be suppressed in the lateral direction and the longitudinal direction of the luminaire.
In the light source unit according to the present invention, the light distribution is controlled by a plurality of first convex portions and a plurality of second convex portions. As a result, glare can be suppressed in the lateral direction and the longitudinal direction of the luminaire.

It is a perspective view of the lighting equipment which concerns on Embodiment 1. FIG. It is an exploded perspective view of the lighting equipment which concerns on Embodiment 1. FIG. It is sectional drawing of the light source unit which concerns on Embodiment 1. FIG. It is a perspective view of the cover which concerns on Embodiment 1. FIG. It is an enlarged view of the lower surface prism part which concerns on Embodiment 1. FIG. It is an enlarged view of the side prism part which concerns on Embodiment 1. FIG. It is a path diagram in the A direction of the light ray passing through the lower surface prism part. It is a path diagram in the A direction and the B direction of the light ray passing through the lower surface prism part. It is a path diagram in the A direction of the light ray passing through the side prism part. It is a light distribution map of the lighting fixture which concerns on Embodiment 1. FIG. It is sectional drawing of the light source unit which concerns on Embodiment 2. FIG. It is sectional drawing of the light source unit which concerns on Embodiment 3. FIG. It is an enlarged view of the concave part which concerns on Embodiment 3. FIG. It is an enlarged view of the leg part which concerns on Embodiment 3. FIG. It is sectional drawing of the light source unit which concerns on Embodiment 4. FIG. It is sectional drawing of the light source unit which concerns on Embodiment 5. FIG. It is an enlarged view of the concave part which concerns on Embodiment 5. It is a perspective view of the cover which concerns on the 1st modification of Embodiment 5. It is a perspective view of the cover which concerns on the 2nd modification of Embodiment 5. It is a perspective view of the cover which concerns on the 3rd modification of Embodiment 5.

The light source unit and the lighting fixture according to the embodiment of the present invention will be described with reference to the drawings. The same or corresponding components may be designated by the same reference numerals and the description may be omitted.

Embodiment 1.
FIG. 1 is a perspective view of the lighting fixture 1 according to the first embodiment. FIG. 2 is an exploded perspective view of the lighting fixture 1 according to the first embodiment. The lighting fixture 1 includes a fixture main body 101 and a light source unit 100 attached to the fixture main body 101. The instrument body 101 is attached to the ceiling or the like. The appliance main body 101 includes a lighting device. Further, the light source unit 100 may include a lighting device. The lighting device lights the light source included in the light source unit 100.

FIG. 3 is a cross-sectional view of the light source unit 100 according to the first embodiment. FIG. 3 is a cross-sectional view of the light source unit 100 in the lateral direction. The light source unit 100 includes a base 10. The base 10 extends along the longitudinal direction of the luminaire 1. The LED module 20 is provided on the base 10. The LED module 20 includes a substrate 22 and a plurality of light sources 21. The number of light sources 21 included in the LED module 20 may be one or more.

The plurality of light sources 21 are provided on the first surface 28 of the substrate 22. The light source 21 is an LED. The plurality of light sources 21 are provided side by side along the longitudinal direction of the substrate 22. The longitudinal direction of the substrate 22 is parallel to the longitudinal direction of the luminaire 1.

Both sides of the base 10 in the lateral direction are held by the mounting portions 33. The mounting portion 33 holds the outside of the area where the substrate 22 of the base 10 is provided. The light source unit 100 is attached to the instrument main body 101 by hooking the spring 91 provided on the instrument main body 101 on the hooking portion 92 of the light source unit 100.

The light source unit 100 includes a diffusion cover 40. The diffusion cover 40 diffuses the light emitted by the light source 21. The diffusion cover 40 is provided so as to cover the light emitting surface side of the light source 21. The diffusion cover 40 has a bottom portion 41 facing the first surface 28 of the substrate 22. Further, the diffusion cover 40 is provided on both sides of the bottom portion 41, and has side portions 42 extending toward the base 10. From the end of the side portion 42 opposite to the bottom portion 41, the fixing portion 43 extends toward the inside of the light source unit 100. The fixing portion 43 is held by the mounting portion 33. As a result, the diffusion cover 40 is held by the mounting portion 33. The fixing portion 43 is caught by the engaging portion of the mounting portion 33. As a result, the fixing portion 43 restricts the diffusion cover 40 from moving toward the cover bottom portion 38 side. The structure of the mounting portion 33 is not limited to that shown in FIG. 3, as long as the base 10 and the diffusion cover 40 can be held. Further, the mounting portion 33 and the diffusion cover 40 may be integrated by two-color molding. Further, the mounting portion 33 and the diffusion cover 40 may be adhered to each other.

The light source unit 100 includes a cover 30 provided in the light emitting direction of the light source 21. In this embodiment, the cover 30 is transparent. Here, the cover 30 does not have to be transparent and may transmit light. The cover 30 is provided so as to cover the LED module 20. Further, the cover 30 is provided so as to cover the light emitting surface side of the light source 21 on the outside of the diffusion cover 40. The cover 30 may be provided so as to cover the diffusion cover 40. The diffusion cover 40 is provided along the cover 30.

The cover 30 has a cover bottom 38 facing the first surface 28. The cover bottom 38 is parallel to the first surface 28. Cover side portions 39 are provided on both sides of the cover bottom portion 38, respectively. The cover side portion 39 extends toward the substrate 22 side. From the end of the cover side portion 39 opposite to the cover bottom portion 38, the cover fixing portion 37 extends toward the inside of the cover 30. The cover fixing portion 37 and the mounting portion 33 are integrated by two-color molding. Not limited to this, a structure in which the cover fixing portion 37 is held by the mounting portion 33 may be used.

A lower surface prism portion 31 is provided on the cover bottom portion 38. The lower surface prism portion 31 is a part of the cover 30. The lower surface prism portion 31 is provided so as to face the first surface 28. The lower surface prism portion 31 has a plurality of first convex portions 61 projecting to the opposite side of the first surface 28. Further, the cover side portion 39 is provided with a side prism portion 32. The side prism portion 32 is a part of the cover 30. The side prism portions 32 are provided on both sides of the light source 21, respectively. The side prism portion 32 has a plurality of second convex portions 62 projecting toward the inside of the cover 30.

FIG. 4 is a perspective view of the cover 30 according to the first embodiment. In FIG. 4, the mounting portion 33 is omitted. The cover 30 extends along the longitudinal direction of the luminaire 1. The longitudinal direction of the cover 30 is parallel to the longitudinal direction of the luminaire 1. The cover 30 has an extruded structure having a constant cross-sectional shape in the lateral direction. Therefore, the plurality of first convex portions 61 and the plurality of second convex portions 62 are continuous in the longitudinal direction of the cover 30. The cover 30 may be manufactured by extrusion molding. The longitudinal direction of the cover 30 is the extrusion direction in extrusion molding.

FIG. 5 is an enlarged view of the lower surface prism portion 31 according to the first embodiment. Each of the plurality of first convex portions 61 provides a first slope 63. The first slope 63 is a side surface of the first convex portion 61. Each of the plurality of first convex portions 61 is a triangle in a cross-sectional view along the lateral direction of the substrate 22. Light is incident on the light incident surface 65 of the lower surface prism portion 31. Further, a part of the light incident on the lower surface prism portion 31 is emitted from the first slope 63.

In the cross-sectional view along the lateral direction of the substrate 22, the angles θ1a and θ1b between the first slope 63 and the light incident surface 65 of the lower surface prism portion 31 are 5 ° to 40 °. The angles θ1a and θ1b are adjusted according to the refractive index of the transparent material forming the lower surface prism portion 31 or the target light distribution. In this embodiment, the angle θ1a and the angle θ1b are equal. Therefore, each of the plurality of first convex portions 61 is an isosceles triangle in a cross-sectional view along the lateral direction of the substrate 22. The angle θ1a and the angle θ1b may be different. Further, the angle θ1a and the angle θ1b may be changed stepwise from the center of the cover 30 toward the outside. For example, the angle θ1a and the angle θ1b may be larger or smaller as the distance from the center of the cover 30 increases.

FIG. 6 is an enlarged view of the side prism portion 32 according to the first embodiment. Each of the plurality of second protrusions 62 provides a second slope 64. The second slope 64 is a side surface of the second convex portion 62. Each of the plurality of second convex portions 62 is a triangle in a cross-sectional view along the lateral direction of the substrate 22. Light is incident on the second slope 64 of the side prism portion 32. Further, a part of the light incident on the side prism portion 32 is emitted from the light emitting surface 66.

In the cross-sectional view along the lateral direction of the substrate 22, the angles θ2a and θ2b between the second slope 64 and the light emitting surface 66 of the side prism portion 32 are 0 ° to 90 °. The angles θ2a and θ2b are adjusted according to the refractive index of the transparent material forming the side prism portion 32 or the target light distribution. In the present embodiment, the angle θ2a and the angle θ2b are different angles, but they may be equal. The angle θ2a and the angle θ2b may be changed stepwise from the bottom to the top.

Next, the optical control by the lower surface prism portion 31 will be described. FIG. 7 is a path diagram of a light ray passing through the lower surface prism portion 31 in the A direction. Here, the A direction is the lateral direction of the substrate 22. The incident light 50 on the lower surface prism portion 31 is refracted on the light incident surface 65. At this time, the light transmitted inside the lower surface prism portion 31 travels only within the range of the total reflection angle θa from the angle perpendicular to the light incident surface 65. Therefore, inside the lower surface prism portion 31, the light is squeezed into a specific angle range.

The light transmitted inside the lower surface prism portion 31 reaches the first slope 63. A part of the light that has reached the first slope 63 is emitted from the first slope 63. Here, the first slope 63 is inclined by angles θ1a and θ1b with respect to the light incident surface 65. At this time, the light emitted from the first slope 63 is light having light shielding angles θb and θc. That is, the emitted light 52 is not emitted within the range of the light shielding angles θb and θc with respect to the light incident surface 65. Further, a part of the light that has reached the first slope 63 becomes the reflected light 51 and is returned to the inside of the cover 30.

From the above, the light emitted from the lower surface prism portion 31 becomes light having specific light-shielding angles θb and θc. In the present embodiment, the lower surface prism portion 31 functions as a prism lens. The shading angles θb and θc depend on the angles θ1a and θ1b. Therefore, by adjusting the angles θ1a and θ1b, it is possible to suppress the light emitted from the light distribution angle of 60 ° to 90 ° in the A direction. Here, the light distribution angle is an angle from a direction perpendicular to the horizontal plane of the luminaire 1. The horizontal plane of the luminaire 1 is a plane parallel to the first surface 28 of the substrate 22. Therefore, glare light can be suppressed in the lateral direction of the luminaire 1.

FIG. 8 is a path diagram of light rays passing through the lower surface prism portion 31 in the A direction and the B direction. Here, the B direction is the longitudinal direction of the substrate 22. FIG. 8 shows a state in which the path of the light beam when the incident light 53 is incident on the lower surface prism portion 31 is viewed from the A direction and the B direction. In the incident light 53, the vector in the A direction is constant. Further, the vector of the incident light 53 in the B direction is set so that the incident angle of the incident light 53 is 0 ° to 90 ° in the cross-sectional view along the longitudinal direction of the substrate 22.

The incident light 53 on the lower surface prism portion 31 is refracted on the light incident surface 65. Here, even if the vector in the A direction is constant in the incident light 53, the vector in the A direction of the refracted light transmitted through the light incident surface 65 changes according to the vector in the B direction of the incident light 53. In the present embodiment, the larger the vector of the incident light 53 in the B direction, the smaller the angle formed by the light with the first slope 63 in the lateral direction of the substrate 22.

Therefore, when the incident angle of the incident light 53 in the cross-sectional view along the longitudinal direction of the substrate 22 is a certain value or more, the light is totally reflected by the first slope 63 and becomes the reflected light 54. The reflected light 54 is returned to the inside of the cover 30. At this time, in the cross-sectional view along the longitudinal direction of the substrate 22, the light 55 emitted from the first slope 63 is not emitted within the range of the light shielding angle θd with respect to the light incident surface 65.

From the above, the emitted light 55 from the lower surface prism portion 31 becomes light having a specific light blocking angle θd. The shading angle θd depends on the angles θ1a and θ1b. Therefore, by adjusting the angles θ1a and θ1b, it is possible to suppress the light emitted from the light distribution angle of 60 ° to 90 ° in the B direction. Therefore, glare light can be suppressed even in the longitudinal direction of the luminaire 1. In the present embodiment, when the material is transparent polycarbonate, the glare cut angle can be set to about 60 ° by setting the angles θ1a and θ1b to, for example, 33 °. On the other hand, the angles θ1a and θ1b may be adjusted in the range of 5 ° to 40 °, and the glare cut angle may be set to, for example, 65 °, 70 ° or 75 °.

Next, the optical control by the side prism unit 32 will be described. FIG. 9 is a path diagram of a light ray passing through the side prism portion 32 in the A direction. The light incident on the side prism portion 32 is refracted upward and downward due to the inclination of the second slope 64. Therefore, the emitted light 57 and 58 emitted from the side prism portion 32 are divided into upper and lower parts. At this time, no light is emitted in the range of the light blocking angle θe centered on the angle perpendicular to the light emitting surface 66. From the above, the light in the A direction is controlled by the side prism portion 32 in the butt wing.

Of the emitted light 57 and 58 emitted from the side prism portion 32, the emitted light 57 emitted upward is an upward luminous flux. In the present embodiment, the emitted light 57 is light directed toward the ceiling. The larger the angle θ2b is with respect to the angle θ2a, the greater the distribution of the upward luminous flux. The larger the angle θ2a is with respect to the angle θ2b, the greater the distribution of the downward luminous flux. Further, the larger the angle θ2a and the angle θ2b, the larger the light-shielding angle θe. In this embodiment, the light in the B direction is not emitted from the side prism portion 32.

FIG. 10 is a light distribution diagram of the lighting fixture 1 according to the first embodiment. FIG. 10 is an example of the light distribution obtained by the lighting fixture 1 according to the present embodiment. In FIG. 10, the horizontal axis indicates the light distribution angle, and the vertical axis indicates the luminous intensity. The solid line shows the light distribution in the A direction of the lighting fixture 1 according to the present embodiment. The broken line indicates the light distribution in the B direction of the lighting fixture 1 according to the present embodiment. The dotted line shows the Lambert light distribution according to the comparative example. The Lambert light distribution is a light distribution in which the brightness of the light emitting surface is constant regardless of the viewing direction.

As shown by the alternate long and short dash line frame 82, the luminous intensity of the luminaire 1 decreases in the range of the light distribution angle of 60 ° to 90 ° in the A direction. Therefore, glare is suppressed in the A direction. Further, as shown by the alternate long and short dash line frame 81, when the light distribution angle exceeds 90 ° in the A direction, the luminous intensity of the luminaire 1 increases. This is due to the emitted light 57, which is an upward luminous flux. The upper luminous flux can increase the brightness of the ceiling surface.

Further, as shown by the alternate long and short dash line frame 82, the luminous intensity of the luminaire 1 is low in the range of the light distribution angle of 60 ° to 90 ° in the B direction. Therefore, glare is suppressed even in the B direction. From the above, in the present embodiment, the cover 30 can suppress glare light in the lateral direction and the longitudinal direction of the luminaire 1. Further, an upward luminous flux can be obtained in the lateral direction of the luminaire 1.

Further, the diffusion cover 40 diffuses the light emitted by the light source 21. The diffusion cover 40 is provided along the cover 30 between the lower surface prism portion 31 and the light source 21. Therefore, a large distance between the light source 21 and the diffusion cover 40 can be secured. As a result, the light emitted by the plurality of light sources 21 can be integrated in the diffusion cover 40. Therefore, uneven brightness of the light emitting surface can be suppressed. Further, by increasing the distance between the light source 21 and the diffusion cover 40, the light emitting surface of the luminaire 1 can be increased. Further, it is possible to prevent the spectroscopy or color unevenness of the light from the light source 21. Further, the bottom portion 41 and the side portion 42 of the diffusion cover 40 may have different diffusivity. That is, the bottom portion 41 and the side portion 42 may be molded in two colors to change the density of the diffusing material. Thereby, the balance of the brightness of the cover bottom portion 38 and the cover side portion 39 can be adjusted. In addition, the upward luminous flux can be adjusted.

In the present embodiment, the first convex portion 61 and the second convex portion 62 are assumed to be triangular in cross-sectional view. As an example of this modification, the first convex portion 61 and the second convex portion 62 may have a curved surface at the apex portion. For example, the first convex portion 61 and the second convex portion 62 may be corrugated in a cross-sectional view along the lateral direction of the substrate 22.

Further, in the present embodiment, the first convex portion 61 and the second convex portion 62 are connected in the longitudinal direction of the cover 30. As an example of this modification, the first convex portion 61 and the second convex portion 62 may be interrupted in the longitudinal direction of the cover 30. Further, in the present embodiment, the first convex portion 61 and the second convex portion 62 are triangular in cross-sectional view along the lateral direction of the substrate 22. As an example of this modification, the first convex portion 61 and the second convex portion 62 may be triangular in a cross-sectional view along the longitudinal direction of the substrate 22. In this case, the first convex portion 61 and the second convex portion 62 are connected to each other in the lateral direction of the cover 30.

Further, in the present embodiment, the cover 30 is assumed to be transparent. As a modification of this, only the lower surface prism portion 31 and the side surface prism portion 32 may be formed of a transparent material. Further, the portion other than the lower surface prism portion 31 and the side prism portion 32 of the cover 30 may be formed of a highly reflective material. The highly reflective material is, for example, a white material. For example, by forming the cover fixing portion 37 and the mounting portion 33, which are the connecting portions with the base 10, from a white material, the reflection efficiency inside the cover 30 can be enhanced. Therefore, the reflected light can be efficiently returned to the lower surface prism portion 31 or the side surface prism portion 32. Further, the lower surface prism portion 31 and the side surface prism portion 32 may be formed of a thin diffusion material. In this case, the diffusion cover 40 may not be provided.

Further, in the present embodiment, the cover bottom portion 38 and the cover side portion 39 are vertical. As an example of this modification, the cover side portion 39 may be tilted from a direction perpendicular to the cover bottom portion 38. Further, in the present embodiment, the surface of the cover bottom 38 facing the first surface 28 of the substrate 22 is a flat surface. That is, the light incident surface 65 is a flat surface. On the other hand, the cover bottom 38 may be curved. Further, in the present embodiment, the light incident surface 65 and the first surface 28 of the substrate 22 are parallel to each other. On the other hand, the light incident surface 65 may be inclined with respect to the first surface 28.

If the upper luminous flux is not required, the side prism portion 32 may be a flat surface and may be formed of a white reflective material. At this time, the angle θ2b and the angle θ2a are 0 °. In this case, the mounting portion 33, the cover fixing portion 37, and the side prism portion 32 may be integrally molded. Further, in this case, the side portion 42 of the diffusion cover 40 may be omitted. At this time, the diffusion cover 40 has a flat plate shape. Further, a holding portion for holding the flat plate-shaped diffusion cover 40 may be provided on the inner portion of the side prism portion 32. At this time, the side prism portion 32 and the bottom prism portion 31 may be integrally provided by two-color molding.

These modifications can be appropriately applied to the light source unit and the luminaire according to the following embodiments. Since the light source unit and the lighting fixture according to the following embodiments have much in common with the first embodiment, the differences from the first embodiment will be mainly described.

Embodiment 2.
FIG. 11 is a cross-sectional view of the light source unit 200 according to the second embodiment. In the present embodiment, the structure of the cover 230 is different from that of the first embodiment. Further, the light source unit 200 includes a lower surface prism portion 231 between the cover bottom portion 238 and the light source 21.

The cover 230 includes a cover bottom portion 238 and a cover side portion 39. The top and back surfaces of the cover bottom 238 are flat. The lower surface prism portion 231 has a plurality of first convex portions 61 projecting to the side opposite to the first surface 28 of the substrate 22. The cover 230 and the lower surface prism portion 231 have an extrusion structure having a constant cross-sectional shape in the lateral direction.

Further, the light source unit 200 includes a diffusion cover 240. The diffusion cover 240 includes a leg portion 245 protruding toward the lower surface prism portion 231. The leg portion 245 allows the distance between the bottom portion 41 of the diffusion cover 240 and the lower surface prism portion 231 to be adjusted. Here, the distance between the bottom portion 41 of the diffusion cover 240 and the lower surface prism portion 231 is adjusted to such an extent that the lower surface prism portion 231 functions as a prism lens.

In the present embodiment, the lower surface prism portion 231 and the cover 230 are separated. As a result, the outer surface of the cover 230 can be formed entirely on a flat surface. Therefore, the maintenance of the lighting fixture 1 can be facilitated.

Embodiment 3.
FIG. 12 is a cross-sectional view of the light source unit 600 according to the third embodiment. FIG. 12 is a cross-sectional view of the light source unit 600 in the lateral direction. The light source unit 600 includes a cover 630. The cover 630 has a cover bottom portion 638 and a plurality of cover side portions 39 provided on both sides of the light source 21. The entire cover bottom 638 is curved when viewed from the longitudinal direction of the substrate 22. That is, the cover bottom portion 638 forms a curved surface protruding in a direction away from the light source 21. The length of the central portion of the cover bottom 638 protruding in the direction perpendicular to the first surface 28 with respect to the end is smaller than the thickness of the cover bottom 638.

Further, the cover 630 includes a plurality of mounting portions 633 that hold the base 10 on both sides of the substrate 22. Further, the cover 630 has a plurality of cover fixing portions 637 that bend toward the inside of the cover 630 from the plurality of cover side portions 39. The plurality of cover fixing portions 637 connect the cover side portion 39 and the mounting portion 633, respectively. Each mounting portion 633 branches up and down from the cover fixing portion 637. The base 10 is fitted between the portion of the mounting portion 633 that protrudes upward from the cover fixing portion 637 and the portion that protrudes downward. The cover bottom portion 638, the plurality of cover side portions 39, the plurality of cover fixing portions 637, and the plurality of mounting portions 633 are integrated.

The light source unit 600 further includes a diffusion cover 640 provided between the cover 630 and the light source 21. The diffusion cover 640 includes a bottom portion 641 facing the first surface 28, and a plurality of side portions 42 extending from both sides of the bottom portion 641 toward the plurality of mounting portions 633. Further, the diffusion cover 640 includes a plurality of fixing portions 643 that bend toward the outside of the diffusion cover 640 from the end portions of the plurality of side portions 42 on the mounting portion 633 side.

The bottom 641 of the diffusion cover 640 is entirely curved when viewed from the longitudinal direction of the substrate 22. The bottom portion 641 is curved so that the distance between the cover bottom portion 638 and the bottom portion 641 is substantially the same. The bottom portion 641 is a curved surface protruding in a direction away from the light source 21. The length of the central portion of the bottom portion 641 protruding in the direction perpendicular to the first surface 28 with respect to the end portion is smaller than the thickness of the bottom portion 641.

FIG. 13 is an enlarged view of the recess 644 according to the third embodiment. The cover 630 is provided with a plurality of recesses 644. Each recess 644 is provided above the side prism portion 32. The recess 644 includes a mounting portion 633 and a cover fixing portion 637. That is, the cover 630 is formed with a capture space covered with a mounting portion 633, a cover fixing portion 637, and a portion of the cover side portion 39 on which the side prism portion 32 is not formed.

The plurality of recesses 644 surround both ends of the diffusion cover 640, respectively. That is, the plurality of fixing portions 643 are each surrounded by the recesses 644. Each fixing portion 643 extends from the end of the side portion 42 opposite to the bottom portion 641 toward the cover fixing portion 637. Both ends of the diffusion cover 640 are sandwiched between a portion of the mounting portion 633 that branches downward from the cover fixing portion 637 and a cover fixing portion 637, respectively. That is, in the present embodiment, the fixed portion 643 is captured in the capture space.

Thereby, the movement of the diffusion cover 640 in the lateral direction of the substrate 22 can be restricted. In particular, since the mounting portion 633 projects downward from the cover fixing portion 637, it becomes easier to restrict the movement of the diffusion cover 640. Further, since the plurality of fixing portions 643 extend from the plurality of side portions 42 toward the outside of the diffusion cover 640, the distance between each side portion 42 and the side prism portion 32 can be secured. Therefore, the distance between the side portion 42 and the side prism portion 32 can be adjusted to such an extent that the side prism portion 32 functions as a prism lens.

Further, the cover fixing portion 637 is smoothly bent. The cover fixing portion 637 has an inclined surface inclined with respect to the cover side portion 39. As a result, the mounting portion 633 and the cover side portion 39 are smoothly connected. Therefore, it is possible to prevent stress from concentrating on the cover fixing portion 637 when the cover 630 is manufactured or molded, or when the light source unit 600 is assembled.

In the present embodiment, the mounting portion 633 is formed by using a material having a light-shielding property and a high reflectivity. Further, the cover fixing portion 637 and the portion of the cover side portion 39 on which the side prism portion 32 is not formed are formed by using a material having a light-shielding property and a high reflectivity.

FIG. 14 is an enlarged view of the leg portion 645 according to the third embodiment. A plurality of leg portions 645 are provided at both ends of the bottom portion 641 in the lateral direction. Each leg 645 projects toward the cover bottom 638. The tip of the leg 645 abuts on the surface of the cover bottom 638 facing the first surface 28. Therefore, the distance between the bottom portion 641 of the diffusion cover 640 and the lower surface prism portion 31 can be adjusted by the leg portion 645. Here, the distance between the bottom portion 641 and the bottom surface prism portion 31 is adjusted to such an extent that the bottom surface prism portion 31 functions as a prism lens.

In this embodiment, the leg portion 645 is formed so as to be continuous from the side portion 42. Not limited to this, for example, the leg portion 645 may protrude from the inner portion of the bottom portion 641 than both ends in the lateral direction. Further, it is preferable that the tip of the leg portion 645 is provided with irregularities on the surface to the extent that light is scattered.

Embodiment 4.
FIG. 15 is a cross-sectional view of the light source unit 700 according to the fourth embodiment. FIG. 15 is a cross-sectional view of the light source unit 700 in the lateral direction. In the present embodiment, the structure of the diffusion cover 740 is different from that of the third embodiment. The diffusion cover 740 is arcuate. The entire diffusion cover 740 is curved when viewed from the longitudinal direction of the substrate 22. The diffusion cover 740 projects in a direction away from the light source 21. The curvature of the diffusion cover 740 is greater than the curvature of the cover bottom 638.

Both ends of the diffusion cover 740 in the lateral direction are fixed portions 743. Here, the lateral direction of the diffusion cover 740 is parallel to the lateral direction of the substrate 22. The fixing portion 743 is covered with the recess 644 in a curved state.

The diffusion cover 740 has a sheet shape and is formed so as to be elastically deformable. The diffusion cover 740 has a flat plate shape when not housed in the cover 630. The diffusion cover 740 is arranged inside the cover 630 in a state of being curved so as to be rolled in the lateral direction as a whole. The diffusion cover 740 projects inside the cover 630 toward the bottom of the cover 638.

Not limited to this, the diffusion cover 740 may be formed in a pre-curved shape by a manufacturing method such as extrusion molding. In this case, the diffusion cover 740 is arranged inside the cover 630 with the convexly protruding side facing the cover bottom 638.

In this embodiment, the structure of the diffusion cover 740 can be simplified. Here, in a state where the light source unit 700 is used, the diffusion cover 740 is arranged inside the cover 630 with the overhanging portion in contact with the cover bottom portion 638. For this reason, it is preferable that the surface of at least the portion of the diffusion cover 740 that is in contact with or close to the bottom of the cover 638 is provided with irregularities to the extent that light is scattered.

Embodiment 5.
FIG. 16 is a cross-sectional view of the light source unit 800 according to the fifth embodiment. FIG. 16 is a cross-sectional view of the light source unit 800 in the lateral direction. In the present embodiment, the structures of the cover 830 and the diffusion cover 840 are different from those in the third embodiment. The diffusion cover 840 has an arcuate curved portion 846 and a plurality of fixing portions 843. The curved portion 846 is entirely curved when viewed from the longitudinal direction of the substrate 22. The curved portion 846 projects in a direction away from the light source 21. The curvature of the curved portion 846 is larger than the curvature of the cover bottom portion 638.

FIG. 17 is an enlarged view of the recess 844 according to the fifth embodiment. Each of the plurality of fixing portions 843 bends from both ends of the curved portion 846 toward the outside of the diffusion cover 840. The plurality of fixed portions 843 extend from both ends of the curved portion 846 in the direction along the horizontal plane. Each fixing portion 843 is surrounded by a recess 844.

The cover 830 has a plurality of cover fixing portions 837. Each cover fixing portion 837 is provided with a third convex portion 867 that protrudes toward the inside of the cover 830. The third convex portion 867 is formed on the mounting portion 633 side from the side prism portion 32. The third convex portion 867 is provided adjacent to the side prism portion 32. The third convex portion 867 protrudes more than the second convex portion 62.

In the recess 844, a capture space covered with the mounting portion 633 and the cover fixing portion 837 is formed. Further, the cover fixing portion 837 is provided with a third convex portion 867. At this time, both ends of the diffusion cover 840 are sandwiched between the portion of the mounting portion 633 that branches downward from the cover fixing portion 837 and the third convex portion 867, respectively, in a state of being inserted into the capture space. Thereby, the movement of the diffusion cover 840 in the lateral direction and the vertical direction of the substrate 22 can be restricted. In the present embodiment, by providing the third convex portion 867, the movement of the diffusion cover 840 can be further restricted as compared with the third and fourth embodiments.

Further, the fixed portion 843 is caught on the third convex portion 867. The third convex portion 867 is a fixed portion locking convex portion. By engaging with the third convex portion 867, the fixing portion 843 is held by the cover 830. This makes it possible to restrict the diffusion cover 840 from moving toward the bottom of the cover 638. Further, the diffusion cover 840 is held in a floating state from the cover bottom 638. Therefore, it is not necessary to provide unevenness on the surface of the diffusion cover 840 to scatter light.

As a modification of the present embodiment, the fixing portion 843 may extend in a direction other than the direction along the horizontal plane. The fixing portion 843 may be hooked on the third convex portion 867, and may be inclined toward the cover bottom portion 638, for example. Further, the third convex portion 867 may not be provided. In this case, the diffusion cover 840 is arranged inside the cover 830 with the overhanging portion in contact with the cover bottom portion 638.

Further, the covers of the first to fifth embodiments are not limited to those described above. An example of modification of the cover will be described below. FIG. 18 is a perspective view of the cover 830a according to the first modification of the fifth embodiment. In FIG. 18, the mounting portion 633 is omitted. The cover 830a includes a plurality of side prism portions 832a provided on both sides of the light source 21. Each side prism portion 832a has a plurality of second convex portions 862a that project outward of the cover 830a and provide a second slope.

As described above, in the first modification, the side prism portion 832a is formed on the outer surface side of the cover side portion 839a. That is, the prism lens in the cover 830a is provided on the outer surface side of the cover bottom portion 638 and the outer surface side of the cover side portion 839a. The side prism portion 832a can control the light emission direction in the same manner as the lower surface prism portion 31. Therefore, glare light can be controlled.

FIG. 19 is a perspective view of the cover 830b according to the second modification of the fifth embodiment. In FIG. 19, the mounting portion 633 is omitted. The cover 830b includes a lower surface prism portion 831b. The lower surface prism portion 831b has a plurality of first convex portions 861b that project toward the inside of the cover 830b and provide a first slope.

In the second modification, the lower surface prism portion 831b is formed on the inner surface side of the cover bottom portion 838b. That is, the prism lens in the cover 830b is provided on the inner surface side of the cover bottom portion 838b and the inner surface side of the cover side portion 39. The lower surface prism portion 831b can control the light emission direction in the butt wing as in the side prism portion 32.

Further, the lower surface prism portion 831b may not be provided. As described above, the side prism portion 32 does not emit light in the range of the light blocking angle θe centered on the angle perpendicular to the light emitting surface 66. Therefore, the side prism portion 32 can suppress glare light in the A direction. Further, the light on the B direction side is not emitted from the side prism portion 32. Therefore, the side prism portion 32 can suppress glare light in the lateral direction and the longitudinal direction of the luminaire 1.

FIG. 20 is a perspective view of the cover 830c according to the third modification of the fifth embodiment. In FIG. 20, the mounting portion 633 is omitted. The cover 830c has a lower surface prism portion 831b and a side prism portion 832a. According to this modification, glare light can be controlled by the side prism portion 832a. Further, the lower surface prism portion 831b can control the light emission direction in the butt wing.

Although the embodiments and modifications have been described above, some of these embodiments or modifications may be combined and carried out. Alternatively, any one or some of these embodiments may be partially implemented. Further, these embodiments are not limited to the above-mentioned contents, and various changes can be made as needed.

1 lighting fixture, 100, 200, 600, 700, 800 light source unit, 101 fixture body, 10 base, 20 LED module, 21 light source, 22 board, 28 first surface, 30, 230, 630, 830, 830a, 830b , 830c cover, 31, 231, 831b bottom prism part, 32, 832a side prism part, 33, 633 mounting part, 37, 637, 837 cover fixing part, 38, 238, 638, 638b cover bottom, 39, 839a cover side Part, 40, 240, 640, 740, 840 Diffusion cover, 41, 641 Bottom, 42 Side, 43, 643, 743, 843 Fixed part, 644, 844 recess, 245, 645 Leg, 846 Curved part, 50, 53 Incident light, 51, 54 Reflected light, 55, 57, 58 Emitted light, 61, 861b First convex part, 62, 862a Second convex part, 63 First slope, 64 Second slope, 65 Light incident surface, 66 Light emission surface, 867 third convex part, 91 spring, 92 hook part, θ1a, θ1b, θ2a, θ2b angle, θa total reflection angle, θb, θc, θd, θe shading angle

Claims (14)

With the board
A light source provided on the first surface of the substrate and
A cover provided in the light emitting direction of the light source and
A lower surface prism portion that is a part of the cover and is provided so as to face the first surface, and
Equipped with
The lower surface prism portion has a plurality of first convex portions that project to the opposite side of the first surface and provide a first slope .
The cover includes side prism portions provided on both sides of the light source.
The side prism portion is a light source unit characterized by having a plurality of second convex portions that project toward the inside of the cover and provide a second slope . The light source unit according to claim 1, wherein each of the plurality of first convex portions is a triangle in a cross-sectional view along the lateral direction of the substrate. Claim 1 or claim, wherein the angle between the first slope and the light incident surface of the lower surface prism portion is 5 ° to 40 ° in a cross-sectional view along the lateral direction of the substrate. Item 2. The light source unit . The light source unit according to any one of claims 1 to 3 , wherein each of the plurality of second convex portions is a triangle in a cross-sectional view along the lateral direction of the substrate. The first aspect of the present invention is characterized in that the angle between the second slope and the light emitting surface of the side prism portion is 0 ° to 90 ° in a cross-sectional view along the lateral direction of the substrate. Item 6. The light source unit according to any one of Item 4 . The light source unit according to any one of claims 1 to 5 , wherein the cover has a constant cross-sectional shape along the lateral direction . The light source unit according to any one of claims 1 to 6 , wherein a diffusion cover provided along the cover is provided between the cover and the light source. The light source unit according to claim 7 , wherein the diffusion cover has a bottom portion facing the first surface and side portions provided on both sides of the bottom portion and extending toward the first surface side. The light source unit according to claim 7 , wherein the cover is provided with recesses surrounding both ends of the diffusion cover. Further equipped with a base provided with the substrate,
The cover is
Cover side portions provided on both sides of the light source, and
A mounting portion that holds the base on both sides of the substrate,
A cover fixing portion that bends from the cover side portion toward the inside of the cover and connects the cover side portion and the mounting portion, respectively.
Have,
The light source unit according to claim 9 , wherein the recess includes the mounting portion and the cover fixing portion. The mounting portion branches up and down from the cover fixing portion.
The light source unit according to claim 10 , wherein both ends of the diffusion cover are sandwiched between a portion of the mounting portion that branches downward from the cover fixing portion and the cover fixing portion. The diffusion cover is
The bottom facing the first surface and
Sides extending from both sides of the bottom toward the mounting portion, and
A fixing portion that is bent toward the outside of the diffusion cover from the end portion of the side portion on the mounting portion side and is surrounded by the recess.
The light source unit according to claim 10 or 11. The light source unit according to claim 8 or 12 , wherein the bottom portion is arcuate. The light source unit according to any one of claims 1 to 13.
The main body of the fixture equipped with a lighting device that lights the light source,
A lighting fixture characterized by being equipped with.

Images