JP6300003B2 - Lighting unit - Google Patents

Description

  The present invention relates to an illumination unit, and more particularly to an illumination unit that irradiates light emitted from an LED in a predetermined direction.

  Conventionally, a lighting device that emits light in a predetermined direction using a reflector, or the entire surface of an LED lamp or a lighting device is covered with a cover, and the light irradiation direction is adjusted by tilting or adjusting the position. There exists a lighting fixture which performs control and suppression of glare (for example, refer to patent documents 1).

  The lighting fixture disclosed in Patent Document 1 includes an optical sheet, thereby controlling the direction of light irradiation or suppressing glare.

JP 2009-163925 A

  Since it is necessary to determine the arrangement position and size of the LED so that the light is strongly irradiated in the desired direction when trying to control the light irradiation direction with the lighting fixture using the reflector having the conventional structure, the lighting fixture There is a problem that it is difficult to reduce the thickness.

  In addition, when using a lighting device with a general light distribution that covers a light source with a cover, there is a problem that it is difficult to efficiently illuminate a desired direction because light diffuses in a direction other than the desired direction. Furthermore, the problem that it is difficult to suppress glare and the problem that light is lost when a light shielding plate is attached have occurred.

  In view of the above problems, an object of the present invention is to provide an illumination unit capable of efficiently irradiating light in a desired direction.

  In order to achieve the above object, one aspect of an illumination unit according to the present invention is configured to cover a light source, a mounting body to which the light source is mounted, and the light source on a side opposite to the mounting body with respect to the light source An optical member disposed, wherein the optical member distributes the traveling direction of the light emitted from the light source in a first direction closer to the optical axis than the emission direction from the light source. And a second region that distributes the traveling direction of the light emitted from the light source in a second direction closer to the optical axis than the first direction.

In one aspect of the illumination unit according to the present invention, an angle between the second direction, which is a traveling direction of light emitted from the second region, and a direction parallel to the optical axis is the first direction . The angle may be larger than the angle between the first direction, which is the traveling direction of light emitted from one region, and the direction parallel to the optical axis.

  In the aspect of the lighting unit according to the present invention, the first direction may be a direction parallel to the optical axis.

  Moreover, in one aspect of the illumination unit according to the present invention, the optical member has a first prism that refracts light emitted from the light source on the first surface and subsequently reflects the light on the second surface. It is good.

  In one aspect of the illumination unit according to the present invention, the optical member has a second prism that refracts light reflected from the light source or reflects the light from the fourth surface. Also good.

  In one aspect of the illumination unit according to the present invention, the mounting body may include a first reflector that reflects light emitted from the light source toward the optical member.

  Moreover, 1 aspect of the illumination unit which concerns on this invention WHEREIN: The reflective surface of a said 1st reflecting plate is good also as having a parabolic curved surface.

  In one aspect of the illumination unit according to the present invention, the optical member has a third region that distributes the traveling direction of the light emitted from the light source in a third direction perpendicular to the optical axis. It is good.

  Further, in one aspect of the illumination unit according to the present invention, the mounting body includes a second reflector that reflects light in a direction perpendicular to the optical axis out of light emitted from the light source in the direction of the optical member. It is good.

  Moreover, in one aspect of the illumination unit according to the present invention, the optical member may have a light diffusion cover for diffusing light emitted from the optical member on the light emission surface side.

  In the aspect of the illumination unit according to the present invention, the optical member may include a light diffusing agent for diffusing light emitted from the optical member.

  ADVANTAGE OF THE INVENTION According to this invention, the illumination unit which can irradiate light in a desired direction efficiently can be provided.

1 is an exploded perspective view of a lighting unit according to Embodiment 1 of the present invention. Sectional drawing at the time of cut | disconnecting in the plane orthogonal to the elongate direction of the illumination unit which concerns on Embodiment 1 of this invention. The figure explaining the boundary of the 1st field and the 2nd field The figure explaining the determination method of the shape of the 1st prism The figure explaining the determination method of the shape of a 2nd prism The figure which shows the optical path of the light which injected into the 1st area | region The figure which shows the optical path of the light which injected into the 2nd area | region The figure which shows the optical path of the light which injected into the 2nd area | region The figure which shows the light distribution curve in the illumination unit which concerns on Embodiment 1 of this invention. The schematic perspective view which shows the example of attachment of the illumination unit which concerns on Embodiment 1 of this invention. Schematic sectional view showing an attachment example of the lighting unit according to the first embodiment of the present invention. Schematic sectional view showing another example of attachment of the lighting unit according to Embodiment 1 of the present invention. Sectional drawing at the time of cut | disconnecting in the plane orthogonal to the elongate direction of the illumination unit which concerns on the modification of Embodiment 1 of this invention. Sectional drawing which shows the optical path in the illumination unit which concerns on the modification of Embodiment 1 of this invention Sectional drawing which shows the optical path in the illumination unit which concerns on the modification of Embodiment 1 of this invention Sectional drawing which shows the optical path in the illumination unit which concerns on the modification of Embodiment 1 of this invention Sectional drawing which shows the optical path in the illumination unit which concerns on the modification of Embodiment 1 of this invention Sectional drawing at the time of cut | disconnecting in the plane orthogonal to the elongate direction of the illumination unit which concerns on Embodiment 2 of this invention. Sectional drawing at the time of cut | disconnecting in the plane orthogonal to the elongate direction of the illumination unit which concerns on Embodiment 2 of this invention. The figure which shows the example of attachment of the illumination unit which concerns on Embodiment 2 of this invention. Sectional drawing at the time of cut | disconnecting in the plane orthogonal to the elongate direction of the illumination unit which concerns on Embodiment 3 of this invention. Sectional drawing at the time of cut | disconnecting in the plane orthogonal to the elongate direction of the illumination unit which concerns on Embodiment 4 of this invention. Sectional drawing at the time of cut | disconnecting in the plane orthogonal to the elongate direction of the illumination unit which concerns on Embodiment 4 of this invention. The figure which shows the illumination light by the illumination unit which has not performed the diffusion process The figure which shows the illumination light by the illumination unit which performed the diffusion process shown in FIG.

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

  Each figure is a schematic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the substantially same structure, The overlapping description is abbreviate | omitted or simplified.

(Embodiment 1)
First, the illumination unit according to Embodiment 1 of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is an exploded perspective view of the lighting unit according to Embodiment 1 of the present invention. FIG. 2 is a cross-sectional view of the lighting unit according to Embodiment 1 of the present invention cut along a plane orthogonal to the long direction.

  As shown in FIG. 1, the illumination unit 1 according to the present embodiment includes an attachment body 10, a substrate 20, an optical member 30, and an LED light source 40 disposed on the substrate 20.

  The mounting body 10 includes a mounting portion 10a and a first reflecting plate 10b. The mounting body 10 is made of a metal such as aluminum, for example, and the mounting portion 10a and the first reflecting plate 10b are integrally formed by an extrusion method. The mounting body 10 has a substantially rectangular shape with a long side of 30 cm and a short side of 10 cm when the mounting portion 10a is mounted on a wall surface or a ceiling. That is, the attachment portion 10a has a substantially rectangular shape. Moreover, the 1st reflecting plate 10b is provided in the one long side of the attaching part 10a in the direction which protrudes from the wall surface or ceiling etc. to which the attaching part 10a was attached.

  The first reflecting plate 10 b reflects the light emitted from the LED light source 40 in the direction of the optical member 30. Thereby, the light emitted from the LED light source 40 can be efficiently incident on the optical member 30.

  In the first reflecting plate 10b, the reflecting surface that reflects light has, for example, a parabolic curved surface. In addition, the said reflective surface of the 1st reflecting plate 10b is not restricted to a parabolic curved surface, The shape of another curved surface and planar shape may be sufficient.

  In addition, the mounting body 10 slides the optical member 30 on the end of the long side opposite to the long side where the first reflecting plate 10b of the mounting portion 10a is disposed and the end of the first reflecting plate 10b. It has two grooves that can be inserted.

  The substrate 20 is made of, for example, a resin substrate and has a substantially rectangular shape. In the mounting portion 10a of the mounting body 10, the substrate 20 has one long side of the substrate 20 joined to the mounting portion 10a along the long side of the mounting body 10 on the side where the first reflecting plate 10b is provided. Yes.

  A linear light source that emits light in a line shape on the substrate 20, and a plurality of LED light sources 40 arranged on the substrate 20 along the long side direction of the substrate 20, and the LED light sources 40 emit light. A circuit or the like (not shown) for supplying electric power necessary for the operation is arranged. The plurality of LED light sources 40 are SMD type light emitting elements, and are provided on the substrate 20 at equal intervals. Note that the substrate 20, the plurality of LED light sources 40 arranged on the substrate 20, a circuit for supplying electric power necessary for causing the LED light sources to emit light, and the like are combined into a light source according to the present invention. The LED light source 40 is fixed to the main surface of the substrate 20 with an adhesive or the like.

  In the present embodiment, the plurality of LED light sources 40 are provided on the substrate 20 at equal intervals. However, the present invention is not limited to this, and the LED light source is a surface light source formed over the entire surface of the substrate 20. Also good. The light source may be a COB type light source in which a phosphor is applied to an LED chip.

  The optical member 30 is made of a light-transmitting resin such as acrylic, and is attached to the mounting body 10 so as to cover the substrate 20 and the LED light source 40. A first prism 50 a, a second prism 50 b, and a third prism 60 are formed on the surface of the optical member 30 that faces the LED light source 40. The first prism 50a and the second prism 50b are regions between one long side of the optical member 30 attached to the first reflecting plate 10b side and the optical axis of the light emitted from the LED light source 40. Is arranged.

  The optical member 30 is not limited to a light transmissive resin such as acrylic, and may be made of glass.

  As shown in FIG. 2, the optical member 30 distributes the traveling direction of light emitted from the LED light source 40 in a first direction closer to the optical axis than the emission direction from the LED light source 40. And a second region that distributes the traveling direction of the light emitted from the LED light source 40 in the second direction closer to the optical axis than the first direction. Thereby, the light output from the LED light source 40 can be efficiently irradiated in a desired direction.

  FIG. 3 is a diagram for explaining the boundary between the first region and the second region. In the optical member 30, a region where light emitted from the LED light source 40 is distributed in the first direction is referred to as a first region, and a region where light is distributed in the second direction is referred to as a second region. In the optical member 30, the boundary between whether the light emitted from the LED light source 40 is distributed in the first direction or the second direction is the boundary between the first region and the second region. Become.

  The angle between the second direction and the direction of the optical axis is larger than the angle between the first direction and the direction of the optical axis. Thereby, the light in the second direction is distributed in a direction different from the light in the first direction. Therefore, the optical member 30 can efficiently irradiate light in the direction opposite to the first region and the second region with respect to the optical axis.

  Moreover, as shown in FIG. 3, the first direction is, for example, a direction parallel to the optical axis. The second direction is a direction closer to the optical axis than a direction parallel to the optical axis. Thereby, light can be efficiently irradiated in the lower part of the LED light source 40 and the direction opposite to the first region and the second region with respect to the optical axis. Moreover, since it is not necessary to provide a reflecting plate that reflects the light emitted from the LED light source 40 in a desired direction, the lighting unit can be thinned.

  The light emitted from the LED light source 40 can be distributed in a direction parallel to the optical axis depending on the shape of the prism disposed in the first region. Thereby, the light quantity of the light illuminated directly under the LED light source 40 can be increased. Moreover, the illuminance and luminous intensity directly under the LED light source 40 can be ensured, and the amount of light emitted from the LED light source 40 in the direction in which the first reflecting plate 10b is provided can be reduced.

  Further, the light emitted from the LED light source 40 can be distributed in a direction closer to the optical axis than in a direction parallel to the optical axis by the shape of the prism disposed in the second region. Thereby, the light quantity of the light radiate | emitted in the direction opposite to the direction in which the 1st reflecting plate 10b was provided can be increased. Further, the amount of light shining directly under the LED light source 40 can be reduced.

  Here, the shapes of the first prism 50a and the second prism 50b will be described. FIG. 4A is a diagram illustrating a method for determining the shape of the first prism 50a. FIG. 4B is a diagram illustrating a method for determining the shape of the second prism 50b.

  As shown in FIG. 4A, in the first prism 50a, the light incident on the A surface is refracted on the A surface, reflected on the B surface, and emitted from the exit surface of the optical member 30. Note that also on the exit surface of the optical member 30, the reflected light from the B surface incident on the exit surface may be refracted.

  As described above, the condition for the incident light to be refracted on the A surface and reflected on the B surface is that the incident angle θ2 of the light to the A surface is θ2 <47 °. When θ2 ≧ 47 °, the amount of light reflected by the A surface increases, so the condition of the first prism 50a is not satisfied. Such a shape of the first prism 50 a is preferable as a shape of the prism disposed at a position far from the LED light source 40. The light distribution angle can be controlled by adjusting the angles of the A and B surfaces of the first prism 50a.

  As shown in FIG. 4B, in the second prism 50 b, the light incident on the B surface is refracted on the B surface and further refracted on the exit surface of the optical member 30. Here, in the case of the prism arranged at a position far from the LED light source 40, the incident angle θ2 of the light incident on the B surface increases with such a shape, so that the component reflected on the B surface increases. Therefore, such a shape of the second prism 50b is preferable as a shape of the prism disposed at a position close to the LED light source 40 so that the incident angle θ2 becomes small.

  In the second prism 50 b, the light incident on the A surface is reflected by the A surface, is incident on the optical member 30, and is further emitted from the exit surface of the optical member 30.

  The light distribution angle can be controlled by adjusting the angles of the A and B surfaces of the second prism 50b.

  Next, the relationship between the first prism 50a and the second prism 50b and the first region and the second region will be described.

  FIG. 5 is a diagram illustrating an optical path of light incident on the first region. 6 and 7 are diagrams illustrating the optical path of light incident on the second region.

  The prism shown in FIG. 5 is the first prism 50a. The light incident on the first prism 50 a is refracted on the A surface, further reflected on the B surface in a direction substantially parallel to the optical axis, and then emitted from the exit surface of the optical member 30. At this time, as shown in FIG. 5, since the traveling direction of the light emitted from the optical member 30 is substantially parallel to the optical axis, the prism is a prism formed in the first region.

  The prism shown in FIG. 6 is the first prism 50a. The light incident on the first prism 50 a is refracted on the A surface, further reflected on the B surface, and refracted on the exit surface of the optical member 30. At this time, as shown in FIG. 6, since the traveling direction of the light emitted from the optical member 30 is closer to the optical axis than the direction parallel to the optical axis, the prism is formed in the second region. It is a prism.

  The prism shown in FIG. 7 is the second prism 50b. The light incident on the B surface of the second prism 50 b is refracted on the B surface and further refracted on the exit surface of the optical member 30. At this time, as shown in FIG. 7, since the traveling direction of the light emitted from the optical member 30 is closer to the optical axis than the direction parallel to the optical axis, the prism is formed in the second region. It is a prism.

  In addition, in the second prism 50b shown in FIG. 7, the light incident on the A surface of the second prism 50b is reflected by the A surface, refracted by the optical member 30, and further refracted by the exit surface of the optical member 30. The At this time, as shown in FIG. 7, the traveling direction of the light emitted from the optical member 30 is light refracted in a direction closer to the optical axis than in a direction parallel to the optical axis. It is a prism formed in the region.

  FIG. 8 is a diagram showing a light distribution curve in the illumination unit 1 according to the present embodiment. In FIG. 8, 0 ° at the center of the horizontal axis indicates the position of the optical axis. The vertical axis indicates the luminous intensity. Moreover, in FIG. 8, the curve shown with a continuous line is the light distribution by the illumination unit 1 which concerns on this Embodiment, and the curve shown with a broken line has shown the light distribution by the illumination unit which is not performing light distribution control.

  As shown by the solid line in FIG. 8, the light from the illumination unit 1 is a so-called D-shaped light distribution. That is, the light from the illumination unit 1 is distributed from below the LED light source 40 to the side where the first reflecting plate 10b is not provided, and the light intensity directly below the LED light source 40 is high. The light intensity gradually decreases as the distance to the right side in FIG. 8 decreases, and when the distance from the position immediately below the LED light source 40 to the left side decreases rapidly. In addition, the area | region of the broken line shown in FIG. 8 is an example of the light distribution curve of the illumination unit which is not controlling light distribution, and it turns out that light is irradiated uniformly.

  When it is desired to irradiate a large amount of light in the direction immediately below the boundary between the first region and the second region, the illuminance and light intensity directly below can be controlled to be higher by increasing the first region. On the contrary, when it is desired to irradiate more light from below the LED light source 40 to the side where the first reflector 10b is not provided, the second region is increased.

  For example, the optimum condition for realizing a uniform D light distribution as shown in FIG. 8 is that the distance from the end of the substrate 20 on the first reflecting plate 10b side to the optical axis is 15 mm, and the surface of the LED light source 40 It is desirable to determine the boundary between the first region and the second region so that θ1 is in the range of 20 ° to 30 ° when the distance from the light source to the exit surface of the optical member 30 is 15 mm.

  In the present embodiment, the optical member 30 is configured to include four first prisms 50a and one second prism 50b, but the number of first prisms 50a and second prisms 50b. May be other numbers, and may be plural or singular.

  Further, all of the plurality of first prisms 50a may have the same shape, or may have different shapes. The same applies to the second prism 50b.

  In addition, the apexes of the first prism 50a and the second prism 50b are preferably pointed. Even when the vertices of the first prism 50a and the second prism 50b must be rounded, it is preferable to make the curvature radius R of the vertices as small as possible.

  Further, a third prism 60 may be provided in addition to the first prism 50a and the second prism 50b. Thereby, light distribution can be efficiently performed in a desired direction.

  FIG. 9A is a schematic perspective view showing an attachment example of the illumination unit 1. FIG. 9B and FIG. 10 are schematic cross-sectional views showing examples of attaching the lighting unit 1.

  As shown in FIGS. 9A and 9B, one lighting unit 1 may be attached to the top of the shelf 100. By arranging in this way, it is possible to illuminate the back of each shelf by attaching the lighting unit 1 to the top.

  Moreover, as shown in FIG. 10, you may attach the illumination unit 1 to each of a some shelf. In this case, it is preferable that the illumination unit 1 is attached to the foremost part of each shelf. Thereby, it can prove uniformly from the front part of each shelf to the back part. Note that illumination that is not subjected to light distribution control may be attached to the uppermost illumination.

  As described above, according to the illumination unit according to the present embodiment, the traveling direction of the light emitted from the LED light source 40 is changed to the first direction closer to the optical axis than the emission direction from the LED light source 40 and the first direction. Since light can be distributed in the second direction closer to the optical axis, light can be efficiently irradiated in a desired direction.

  Moreover, according to the illumination unit 1 according to the present embodiment, it is not necessary to provide a reflector, and can be made thinner than a conventional illumination unit. For example, when it is desired to attach an illumination unit to each of a plurality of shelves In addition, even when the intervals between the plurality of shelves are narrow, they can be attached under each shelf. As a result, even in a narrow space such as a shelf, the entire light can be efficiently and uniformly illuminated. Moreover, according to the illumination unit 1, since glare can be suppressed and attachment of a light shielding plate etc. becomes unnecessary, the loss of light is reduced and light can be efficiently irradiated.

(Modification of Embodiment 1)
Next, a modification of the first embodiment will be described with reference to FIGS. 11A to 11E. FIG. 11A is a cross-sectional view of a lighting unit according to a modification of the present embodiment cut along a plane orthogonal to the long direction. 11B to 11E are cross-sectional views showing optical paths in the illumination unit according to the modified example of Embodiment 1 of the present invention.

  As shown in FIG. 11A, the illumination unit according to this modification includes a first reflecting plate 10b. The reflecting surface of the first reflecting plate 10b may have a planar shape or a curved surface shape. Further, when the reflecting surface of the first reflecting plate 10b has a curved surface shape, it may have any curved surface shape. Below, the example of the shape of the reflective surface of a 1st reflecting plate is shown.

  The reflecting surface of the reflecting plate 10b shown in FIG. 11A has a parabolic curved surface as shown in FIG. 11B. Since the first reflector 10b has a parabolic curved surface, the light emitted from the LED light source 40 and reflected by the first reflector 10b efficiently enters the optical member 30 as shown in FIG. 11B. . Therefore, the light emitted from the optical member 30 is irradiated to the lower side of the illumination unit 1 and the side where the first reflecting plate 10b is not provided. Therefore, according to the illumination unit 1 having such a configuration, it is possible to efficiently irradiate in a desired direction.

  Moreover, the reflecting surface of the reflecting plate 10c shown in FIG. 11C has a planar shape. In this case, the light reflected by the first reflecting plate 10c is incident on the optical member 30, and the light incident on the optical member 30 is transmitted by the first prism 50a and the second prism 50b provided on the optical member 30. The light is refracted or reflected and emitted from the optical member 30. Here, as shown in FIG. 11C, the light emitted from the optical member 30 is emitted toward the first reflecting plate 10c. The light irradiated in this direction is not desired light but light in a direction that is difficult to control.

  Further, the reflecting surface of the first reflecting plate 10d shown in FIG. 11D has a curved surface shape with a curvature radius of 20 mm. In this case, the light reflected by the first reflecting plate 10d is incident on the optical member 30, and the light incident on the optical member 30 is transmitted by the first prism 50a and the second prism 50b provided on the optical member 30. The light is refracted or reflected and output from the optical member 30. Here, as shown in FIG. 11D, the light emitted from the optical member 30 is emitted to the first reflecting plate 10d side. The light irradiated in this direction is not desired light but light in a direction that is difficult to control.

  Further, the reflecting surface of the first reflecting plate 10e shown in FIG. 11E has a curved surface shape with a curvature radius of 40 mm. In this case, the light reflected by the first reflecting plate 10e is incident on the optical member 30, and the light incident on the optical member 30 is transmitted by the first prism 50a and the second prism 50b provided on the optical member 30. The light is refracted or reflected and output from the optical member 30. Here, as shown in FIG. 11D, the light emitted from the optical member 30 is reflected by the optical member 30 on the first reflecting plate 10e side. This reflected light is not desired light but light that is difficult to control.

  As described above, the shape of the reflecting surface of the first reflecting plate is preferably a parabolic curved surface.

(Embodiment 2)
Next, an illumination unit according to Embodiment 2 of the present invention will be described with reference to FIGS. FIG.12 and FIG.13 is sectional drawing at the time of cut | disconnecting by the plane orthogonal to the elongate direction of the illumination unit which concerns on this Embodiment. FIG. 14 is a diagram illustrating an example of attachment of the lighting unit according to the present embodiment.

  The illumination unit 2 shown in FIG. 12 is different from the illumination unit 1 according to Embodiment 1 in that the optical member 30 includes a third region in addition to the first region and the second region.

  In the third region 70, the light emitted from the LED light source 40 is refracted or reflected by the surface of the optical member 30, and is distributed in a third direction perpendicular to the optical axis. Thereby, the optical member 30 can emit light over a wide range to the side where the first reflecting plate 10b is not provided.

  The third region 70 shown in FIG. 12 further has a region composed of a plurality of fourth prisms 70a and a region composed of a plurality of fifth prisms 70b. Similar to the first prism 50a, the fourth prism 70a refracts incident light. Similar to the second prism 50b, the fifth prism 70b reflects incident light. Thereby, the light emitted from the optical member 30 is emitted in a wide range in the right direction in FIG. 12, that is, the side where the first reflecting plate 10b is not provided.

  Note that the fourth region is not limited to the region composed of the plurality of fourth prisms 70a and the region composed of the plurality of fifth prisms 70b as described above. The fourth prism 70a and the fifth prism 70b may have the same shape or different shapes.

  Further, the illumination unit 3 shown in FIG. 13 is different from the illumination unit 1 according to Embodiment 1 in that the third region further includes a fourth region and a fifth region.

  As shown in FIG. 13, in the optical member 30, the surface on which the fourth region is formed and the surface on which the fifth region is formed form a predetermined angle. The fourth area is composed of a plurality of fifth prisms 72. The fifth region is composed of a plurality of sixth prisms 74.

  Similar to the first prism 50a, the sixth prism 72 and the seventh prism 74 refract incident light. Thereby, the light emitted from the optical member 30 emits the light in a wide range in the right direction in FIG. 13, that is, the side where the first reflection plate 10b is not provided. Thereby, the optical member 30 can emit light over a wide range to the side where the first reflecting plate 10b is not provided.

  FIG. 14 shows an example in which the lighting unit 2 is attached to the shelf 100. By attaching the illumination unit 2, it is possible to sufficiently irradiate light up to the back side of the shelf. The lighting unit attached to the shelf 100 is not limited to the lighting unit 2 but may be the lighting unit 3. Even in this case, similarly to the lighting unit 2, light can be sufficiently irradiated to the back side of the shelf 100.

(Embodiment 3)
Next, an illumination unit according to Embodiment 3 of the present invention will be described with reference to FIG. FIG. 15 is a cross-sectional view of the lighting unit according to Embodiment 3 of the present invention cut along a plane orthogonal to the long direction.

  The difference between the lighting unit 4 according to the present embodiment and the lighting unit 1 according to the first embodiment is that a second reflecting plate is provided.

  As shown in FIG. 15, the illumination unit 4 includes a second reflecting plate 80. The second reflecting plate 80 is made of, for example, a metal material such as aluminum like the mounting body 10 and is integrally formed with the mounting body 10. The second reflecting plate 80 reflects light in a direction perpendicular to the optical axis in the light emitted from the LED in the direction of the optical member 30. Thereby, the light emitted from the LED can be efficiently incident on the optical member 30.

  In the second reflecting plate 80, the shape of the light reflecting surface may be a curved surface or a flat surface as in the first reflecting plate 10b. In the case of a curved surface, it may be a parabolic curved surface or a curved surface determined by a radius of curvature.

  The second reflecting plate 80 may not be formed integrally with the mounting body 10 or may be made of a material different from that of the mounting body 10.

(Embodiment 4)
Next, an illumination unit according to Embodiment 4 of the present invention will be described with reference to FIGS. 16 to 18B. 16 and 17 are cross-sectional views when cut along a plane perpendicular to the longitudinal direction of the illumination unit according to the present embodiment.

  The difference between the illumination unit according to the present embodiment and the illumination unit 1 according to the first embodiment is that the optical member 30 has a light diffusion effect.

  The illumination unit 5 shown in FIG. 16 has a light diffusion cover 90 on the surface of the optical member 30. The light diffusion cover 90 may be, for example, a texture or dimple formed on the surface of the optical member 30 or a light diffusion treatment film. By performing such a process on the surface of the optical member 30, the light emitted from the optical member 30 becomes uniform light with suppressed glare.

  FIG. 18A is a diagram illustrating illumination light from an illumination unit that is not subjected to diffusion processing. FIG. 18B is a diagram illustrating illumination light from the illumination unit that has been subjected to the diffusion process.

  As shown in FIG. 18A, when the diffusion process is not performed on the optical member 30, streaks are seen in the light emitted from the optical member 30, and the light is not uniform. On the other hand, as shown in FIG. 18B, when the optical member 30 is subjected to the diffusion treatment, the optical member 30 emits uniform light as a whole. Accordingly, by performing diffusion treatment on the surface of the optical member 30, it is possible to suppress glare of light emitted from the optical member 30 and obtain uniform light.

  Moreover, in the illumination unit 6 shown in FIG. 17, the optical member 130 is formed of a material containing a diffusing agent. As the diffusing agent here, for example, fine particles called a light diffusing agent are used.

  Thus, the optical member 130 is formed of a material containing a diffusing agent, so that the prism 150 formed in the first and second regions formed in the optical member 130 and the prism formed in the third region. The light can be diffused and uniformly irradiated at portions other than 160 and the prism. Therefore, the glare of the light emitted from the optical member 130 can be efficiently suppressed and uniform light can be obtained.

(Other variations)
The lighting unit according to the present invention has been described based on the embodiment, but the present invention is not limited to the above embodiment.

  For example, in the above-described embodiment, the optical member 30 is configured to include four first prisms 50a and one second prism 50b, but the first prism 50a and the second prism 50b are not provided. The number may be other numbers, and may be plural or singular.

  Further, all of the plurality of first prisms 50a may have the same shape or different shapes. The same applies to the second prism 50b.

  Further, the apexes of the first prism 50a and the second prism 50b may be pointed or rounded. Even when the vertices of the first prism 50a and the second prism 50b must be rounded, it is preferable to make the curvature radius R of the vertices as small as possible.

  In addition, the form obtained by making various modifications conceived by those skilled in the art with respect to each embodiment and modification, and the components and functions in each embodiment and modification are arbitrarily set within the scope of the present invention. Forms realized by combining them are also included in the present invention.

1, 2, 3, 4, 5, 6 Illumination unit 10 Mounting body 10a Mounting portion 10b, 10c, 10d, 10e First reflector 20 Substrate 30, 130 Optical member 40 LED light source (light source)
50a first prism 50b second prism 60 third prism 70a fourth prism 70b fifth prism 72 sixth prism 74 seventh prism 80 second reflector 90 light diffusion cover 150, 160 prism

Claims (10)

A light source;
An attachment body to which the light source is attached;
An optical member disposed on the opposite side of the mounting body with respect to the light source so as to cover the light source,
The optical member is
A first region that distributes the traveling direction of light emitted from the light source in a first direction closer to the optical axis than the emission direction from the light source;
A second region that distributes the traveling direction of the light emitted from the light source in a second direction closer to the optical axis than the first direction ;
A lighting unit comprising: a third region that distributes a traveling direction of light emitted from the light source in a third direction perpendicular to the optical axis . The angle between the second direction, which is the traveling direction of the light emitted from the second region, and the direction parallel to the optical axis is the traveling direction of the light emitted from the first region. The lighting unit according to claim 1, wherein the lighting unit is larger than an angle between the first direction and a direction parallel to the optical axis. The lighting unit according to claim 1, wherein the first direction is a direction parallel to the optical axis. The said optical member has a 1st prism which refracts | emits the light radiate | emitted from the said light source on a 1st surface, and reflects on a 2nd surface continuously. Lighting unit. The illumination according to claim 1, wherein the optical member includes a second prism that refracts light emitted from the light source on a third surface or reflects light on a fourth surface. unit. The lighting unit according to any one of claims 1 to 5, wherein the mounting body includes a first reflecting plate that reflects light emitted from the light source toward the optical member. The illumination unit according to claim 6, wherein a reflection surface of the first reflection plate has a parabolic curved surface. The mounting body, according to any one of claims 1 to 7, comprising a second reflector for reflecting light in the direction perpendicular to the optical axis of the light emitted from the light source in the direction of the optical member Lighting unit. The optical member, the emission surface side of the light, the lighting unit according to any one of claims 1 to 8 having a light diffusion cover for diffusing light emitted from the optical member. The optical member, the illumination unit according to any one of claims 1 to 8 including a light diffusing agent for diffusing light emitted from the optical member.