JP6179766B2 - lighting equipment - Google Patents

Description

  The present invention relates to a lighting device installed on a wall surface, a ceiling, or the like.

  2. Description of the Related Art Conventionally, a so-called wall washer type lighting fixture that is installed on a wall surface or a ceiling near the wall surface and irradiates light toward the wall surface is known. This type of lighting fixture is used as lighting for shops such as blackboard lamps and convenience stores (see, for example, Patent Document 1).

  FIG. 8 shows the configuration of the side cross section of the blackboard lamp as described above. The lighting fixture 101 includes a light source 102, a reflection plate 103 that controls light distribution from the light source 102, and a fixture body 110 that houses the light source 102 and the reflection plate 103. The instrument main body 110 has an opening 111 for emitting light directly reflected from the light source 102 and reflected by the reflector 103 to the outside of the instrument. The light source 102 is provided in a position separated from the center in the instrument main body 110, and the reflection plate 103 is formed in an elliptical cross section with the light source 102 as a focal point, and both ends of the ellipse are in the opening 111. It is connected. According to this luminaire 101, the reflector 103 distributes light in the elliptical long axis direction (the direction of the arrow L in the figure), so that the luminous intensity in the inclined direction is greater than the direction directly below the fixture body 110. can do.

JP 2002-289028 A

  However, according to the luminaire described in Patent Document 1, light is transmitted by the side surfaces of the reflector 103 and the instrument body 110 except for the desired light distribution direction set by the position of the light source 102 and the shape of the reflector 103. For example, the area A indicated by the broken line in FIG. Moreover, this kind of lighting fixture cannot illuminate a wide area like a general base light, and its versatility is low. On the other hand, even when a general-purpose base light is mounted to be inclined with respect to the ceiling or wall surface, the light intensity in directions other than the tilt direction is reduced.

  An object of the present invention is to solve the above-mentioned problems, and to provide a lighting device that can increase the luminous intensity in a desired direction and can irradiate light in other directions and has high versatility. And

In order to solve the above-described problems, the present invention provides a lighting device including a plurality of point light sources, a long substrate on which the light sources are mounted, and a bowl-shaped cover that collectively covers the light sources and the substrates. The light source has an optical axis in a normal direction of the substrate, and the cover has an incident surface on which light from the light source is incident and an output surface on which light incident on the incident surface is emitted. And the incident surface has a plurality of prisms for controlling the light distribution of the light incident on the incident surface, and each of the prisms in the cross-sectional view orthogonal to the longitudinal direction of the cover A control surface that refracts light incident from a light source; and a non-control surface that is in contact with the control surface and is inclined with respect to the control surface, the control surface being a maximum luminous intensity of light emitted from the emission surface direction, are formed so as to incline with respect to the optical axis, the plurality of flops Prism as a boundary the maximum luminous intensity direction, characterized in that the inclination direction is reversed with respect to the direction parallel to the optical axis of the control surface.

  In the above luminaire, the maximum luminous intensity direction preferably has an inclination angle of 10 to 30 ° with respect to the optical axis.

  In the above luminaire, an inclination angle of the control surface located on the substrate side with respect to the maximum luminous intensity direction with respect to a direction parallel to the optical axis is preferably 60 to 150 °.

  In the above luminaire, it is preferable that the interval between the adjacent prisms becomes smaller from the position close to the substrate toward the maximum luminous intensity direction.

  In the luminaire described above, it is preferable that the cover has a texture or a light scattering agent applied to the entrance surface or the exit surface.

  In the above luminaire, the cover is preferably made of a material containing a light diffusing agent.

  According to the present invention, the prism is formed on the incident surface of the cover, and the maximum luminous intensity direction of the light emitted by the control surface can be inclined with respect to the optical axis direction of the light source. Light can be irradiated in directions other than the maximum luminous intensity direction. In addition, such a light distribution is formed by a prism of the cover, and the light source uses the normal line of the substrate as the optical axis. Therefore, if the cover is changed, the light distribution can be symmetric with respect to the optical axis. Sexuality can be increased.

(A) is a perspective view of the lighting fixture which concerns on one Embodiment of this invention, (b) is a sectional side view of the lighting fixture. The perspective view of the cover used for the lighting fixture. The partial sectional view of the said lighting fixture, and the partial enlarged view of a cover. (A) and (b) are figures which show the light distribution curve in the said lighting fixture. The sectional side view orthogonal to the longitudinal direction of the illuminator device. The sectional side view orthogonal to the longitudinal direction of the cover which concerns on the form different from the said embodiment. (A) and (b) are the fragmentary sectional side views of the cover which concerns on the modification of the said embodiment. The sectional side view of the conventional lighting fixture.

  The lighting fixture which concerns on one Embodiment of this invention is demonstrated with reference to FIGS. As shown in FIGS. 1 (a) and 1 (b), the luminaire 1 of this embodiment includes a light source 2, a substrate 3 on which the light source 2 is mounted, a cover 4 that covers the light source 2 and the substrate 3, and holds them. An instrument body 10 to be provided. The appearance of the luminaire 1 is a rectangular shape when viewed from the front, and has a laterally symmetrical side shape when viewed from the short side direction. Moreover, the lighting fixture 1 is further provided with the power supply part (not shown) which is provided in the instrument main body 10 inside or outside, and drives a light source to light.

  The instrument body 10 has a trapezoidal shape in a cross-sectional view orthogonal to the longitudinal direction, and the lower bottom surface is a construction surface 11 such as a ceiling, and the upper bottom surface is a mounting surface 12 of the substrate 3. Further, the side surfaces 13 that connect both edges of the construction surface 11 and the mounting surface 12 are inclined so as to be continuous with the saddle shape of the cover 4 described later. Thereby, the instrument main body 10 does not block the light emitted from the cover 4, and a sense of unity between the instrument main body 10 and the cover 4 is obtained, and the design is improved.

  The mounting surface 12 has a concave portion 14 along the longitudinal direction at the center thereof, and the long substrate 3 is provided in the concave portion 14. The instrument main body 10 is formed by pressing and cutting a plate material such as an aluminum plate or a steel plate having a predetermined rigidity and heat resistance into the above shape. The mounting surface 12 may be coated with a white paint having a high visible light reflectance, or a reflective metal material may be deposited thereon.

  The light source 2 is an LED that is a point light source, and a plurality of LEDs are arranged in a line along the longitudinal direction of the substrate 3 at regular intervals. The light source 2 has an optical axis H in the normal direction of the substrate 3. The LED constituting the light source 2 is configured as an LED package by covering with a wavelength conversion member that converts the wavelength of light emitted from the LED chip. The light source 2 is not particularly limited as long as it is a light source capable of emitting a desired light color as the luminaire 1. For example, a YAG fluorescent light is applied to a GaN blue LED chip that emits blue light having an emission peak wavelength of 460 nm. A so-called white LED that covers the body is preferably used. In addition, it is also possible to use a plurality of LEDs having different emission colors, arrange them in a row, and mix the emitted light of each LED to realize predetermined irradiation light. Examples of the combination of LEDs include white light and a light bulb color, or a combination of three primary colors (RGB). In addition, the output of these LEDs can be individually controlled to make the color temperature of the irradiation light variable.

  The substrate 3 is a long plate-like member formed so that a plurality of light sources 2 can be mounted in a row, and as the base material, for example, a general-purpose substrate plate material such as glass epoxy resin is preferably used. Used. On the substrate 3, a terminal portion electrically connected to a wiring pattern (not shown) for supplying power to the LED is formed on the LED mounting surface.

  As shown in FIG. 2, the cover 4 has a bowl-like appearance so that the light sources 2 arranged in a row can be collectively covered, and the bowl-shaped concave side faces receive light from the light source 2. The incident surface 41 becomes incident, and the convex side surface becomes the emitting surface 42 that emits light incident on the incident surface 21. Further, the cover 4 has a protrusion 42A (see FIG. 6 to be described later) used for attachment to the instrument body 10 on the incident surface 21 side, and this protrusion is a groove formed on the mounting surface 12 of the instrument body 10. 15 (see FIG. 2B). It should be noted that flanges (not shown) are provided on both edges of the cover 4, and groove-like locking parts (not shown) for locking the flanges of the cover 4 are provided on both edges along the longitudinal direction of the mounting surface 12. Thus, the cover 4 may be attached to the instrument body 10. The cover 4 is made of translucent polycarbonate or acrylic resin.

  As shown in FIG. 3, the incident surface 41 of the cover 4 includes a plurality of prisms 43 that control the light distribution of the light incident on the incident surface 41. The plurality of prisms 43 are formed so as to incline the maximum luminous intensity direction M of the light emitted from the emission surface 42 with respect to the optical axis H. Specifically, each prism 43 has a control surface 44 that refracts light incident from the light source 2, and a non-control surface 45 that contacts the control surface 44 and is inclined with respect to the control surface 44. The plurality of prisms 43 are divided into a prism group 43a whose control surface 44 is inclined to the plus side with respect to a direction H ′ parallel to the optical axis H, and a prism group 43b which is inclined to the minus side. The prism group 43a and the prism group 43b are reversed with the desired maximum luminous intensity direction M as a boundary in a cross-sectional view orthogonal to the longitudinal direction of the cover 4.

  In a general condensing prism, the maximum luminous intensity direction M is the optical axis H direction, and a prism group 43a inclined to the plus side with respect to the optical axis H and a prism group 43b inclined to the minus side have an optical axis. It is formed symmetrically with respect to H. On the other hand, the prism 43 of the present embodiment is formed so that the maximum luminous intensity direction M has an inclination angle θ1 in the range of 10 to 30 ° with respect to the optical axis H. That is, a prism group 43a inclined to the plus side is formed on the substrate 3 side with respect to the maximum luminous intensity direction M, and a prism group 43b inclined to the minus side is formed on the opposite side across the maximum luminous intensity direction M of the prism group 43a. Is done. The control surface 44 of each prism 43 refracts the light incident from the light source 2 in the maximum luminous intensity direction M. In addition, the dotted line arrow in a figure shows an example of the light beam of light by which the light distribution is controlled by the cover 4.

  Since the light source 2 has the normal line of the substrate 3 as the optical axis H, the light distribution of the light emitted from the light source 2 is symmetrical with respect to the optical axis H in a cross-sectional view orthogonal to the longitudinal direction of the cover 4. is there. On the other hand, by using the cover 4 having the prism 43, the luminous intensity in the direction inclined with respect to the optical axis H can be increased as shown in FIGS. 4A and 4B show light distribution curves when the light source 2 is turned on by changing the set light intensity. Thus, when the lighting fixture 1 is installed on a ceiling or the like near the wall surface, so-called wall washer illumination that irradiates light toward the wall surface can be performed.

  The control surface 44 of the prism 43 is formed so that the maximum luminous intensity direction M is inclined with respect to the direction H ′ parallel to the optical axis H, while the non-control surface 45 is formed in that way. Not. Therefore, the direction opposite to the maximum luminous intensity direction M (for example, the angle range A in the figure) across the optical axis H also has a certain degree of luminous intensity. That is, by using the cover 4 on which the prism 43 is formed, the luminaire 1 can increase the luminous intensity in a desired direction as wall washer illumination, and can also irradiate light in other directions.

  As described above, the lighting apparatus 1 uses the prism 43 formed on the incident surface 41 of the cover 4 to increase the luminous intensity in a desired direction and create a region that blocks light like a conventional reflector. And light can be irradiated over a wide range.

  When the maximum luminous intensity direction M is 10 to 30 ° with respect to the optical axis H, the inclination angle θ2 of the control surface 44 positioned on the substrate 3 side with respect to the maximum luminous intensity direction M with respect to the direction H ′ parallel to the optical axis H is 60 to 150 ° is preferable. In this way, the prism group 43a inclined to the plus side can collect light in the maximum luminous intensity direction M more effectively.

  Further, as shown in FIG. 5, the interval between the adjacent prisms 43 is formed so as to decrease from the position close to the substrate 3 toward the maximum luminous intensity direction M. A general LED light distribution used for the light source 2 is a Lambertian light distribution, and the luminous intensity of the light emitted from the light source 2 is halved in the direction of 60 ° from the optical axis H. Therefore, the light condensing property in the maximum luminous intensity direction M can be improved by narrowing the interval between the prisms 43 in the angle range where the luminous intensity is high and increasing the density of the prisms 43 (control surface 44). Moreover, the moldability of the cover 4 can be improved by reducing the number of prisms 43 in the angle range where the luminous intensity is low.

  In the lighting fixture of this embodiment, the light source 2 uses the cover 4 in which the optical axis H direction is the maximum luminous intensity direction M and the prism 43 asymmetric with respect to the optical axis H is formed. The maximum luminous intensity direction M is inclined with respect to the angle. Therefore, if a cover 140 symmetrical to the optical axis H as shown in FIG. 6 is used instead of the cover 4 described above, it can be used not only for wall washer illumination but also for a normal base light. Therefore, the general versatility of the entire instrument excluding the cover 4 can be increased.

  A modification of the above embodiment will be described with reference to FIG. In this modification, the cover 4 is configured to have light diffusibility. Specifically, as shown in FIG. 7A, a light-transmitting resin (or a light-scattering agent or a light-scattering agent) is applied to the incident surface 41 or the output surface 42 of the cover 4 (the output surface 42 in the illustrated example). The diffusion treatment layer 46 is formed by applying the sheet. Alternatively, as shown in FIG. 7B, the cover 4 itself is made of a material containing a light diffusing agent 47. According to this configuration, light can be distributed in a desired direction, and glare can be suppressed.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, in the above-described embodiment, the configuration using the LED that is a point light source as the light source 2 is shown. However, the light source 2 may be a linear light source such as a straight tube fluorescent lamp, A planar light source such as an organic EL may be used. The cover 4 is preferably symmetrical with respect to the optical axis H in a cross section orthogonal to the longitudinal direction of the cover 4 except for the shape of the prism 43. In this way, the maximum luminous intensity direction can be reversed without changing the attachment direction of the instrument itself by simply reversing and attaching the cover 4 to the instrument body 10.

DESCRIPTION OF SYMBOLS 1 Lighting fixture 2 Light source 3 Substrate 4 Cover 41 Incident surface 42 Output surface 43 Prism 44 Control surface 45 Non-control surface 46 Diffusion processing layer 47 Light diffusing agent H Optical axis of light source H ′ Direction parallel to optical axis M Maximum luminous intensity direction θ1 Tilt angle with respect to optical axis in maximum luminous intensity direction θ2 Tilt angle with respect to direction parallel to optical axis of control surface

Claims (6)

A lighting apparatus comprising a plurality of point-like light sources, a long substrate on which the light sources are mounted, and a bowl-shaped cover that collectively covers the light sources and the substrate,
The light source has an optical axis in a normal direction of the substrate;
The cover has an incident surface on which light from the light source is incident, and an emission surface that emits light incident on the incident surface,
The incident surface has a plurality of prisms that control light distribution of light incident on the incident surface;
In a cross-sectional view orthogonal to the longitudinal direction of the cover, each of the prisms includes a control surface that refracts light incident from the light source, and a non-control surface that is in contact with the control surface and is inclined with respect to the control surface. Have
The control surface is formed to incline the maximum luminous intensity direction of light emitted from the emission surface with respect to the optical axis ,
The lighting fixture according to claim 1, wherein the plurality of prisms have a tilt direction with respect to a direction parallel to the optical axis of the control surface reversed with the maximum luminous intensity direction as a boundary .   The lighting apparatus according to claim 1, wherein the maximum luminous intensity direction has an inclination angle of 10 to 30 ° with respect to the optical axis.   The inclination angle of the control surface located on the substrate side with respect to the maximum luminous intensity direction with respect to a direction parallel to the optical axis is 60 to 150 °. lighting equipment.   4. The lighting apparatus according to claim 1, wherein an interval between the adjacent prisms decreases as the distance from the position close to the substrate approaches the maximum luminous intensity direction. 5.   The lighting device according to any one of claims 1 to 4, wherein the cover has a texture or a light scattering agent applied to the entrance surface or the exit surface.   The said cover is comprised with the material containing a light-diffusion agent, The lighting fixture as described in any one of the Claims 1 thru | or 4 characterized by the above-mentioned.