JP2011065831A - Lighting fixture - Google Patents

Abstract

In a lighting fixture that collects and emits light emitted from a light source, the lighting fixture is miniaturized and the light collecting performance is enhanced.
A lighting fixture includes a light source, a reflecting plate that reflects light emitted from the light source, and a lens that collects light emitted from the light source. The reflector 3 is arranged so that light emitted toward one region R1 divided by the surface including the optical axis A2 of the light source 21 is incident and the light is reflected toward the other region R2. . The lens 4 is disposed so that light emitted from the light source 21 toward the other region R2 is incident, the light is collected, and is emitted in the same direction as the light reflected by the reflecting plate 3. Thereby, while the reflecting plate 3 is reduced in size and all the light which is not incident on the reflecting plate 3 is incident on the lens 4 and is condensed, the condensing performance of the lighting fixture 1 is improved.
[Selection] Figure 2

Description

  The present invention relates to a lighting fixture that collects and emits light emitted from a light source.

  2. Description of the Related Art Conventionally, there is known a lighting fixture that reflects light collected from an LED (light emitting diode) light source by a reflecting plate and collects the reflected light in a direction orthogonal to the optical axis of the LED light source (for example, , See Patent Document 1). Such a lighting fixture 100 is shown in FIG. This luminaire 100 includes an LED light source 102 and a reflector 103 having a paraboloid of revolution. The reflector 103 is arranged so that the rotational symmetry axis A1 of the paraboloid of revolution is orthogonal to the optical axis A2 of the LED light source 102, reflects the light emitted from the LED light source 102, and condenses it into parallel light. Irradiate in a direction perpendicular to axis A2.

  In the luminaire 100, the light reflected by the reflecting plate 103 is condensed into parallel light as indicated by the optical paths La, Lb, and Lc, but is reflected by the reflecting plate 103 as indicated by the optical paths Ld and Le. Light that is not reflected is not collected. In order to improve the light collecting performance of the lighting fixture 100, it is necessary to enlarge the reflector 103, and the size of the lighting fixture 100 increases.

  When it is necessary to reduce the size of the luminaire, as shown in FIG. 5, the reflector 103 of the luminaire 101 is large enough to fit in one region R1 divided by the plane including the optical axis A2 of the LED light source 102. It can be considered. In this luminaire 101, as indicated by the optical paths La and Lb, the reflector 103 condenses light emitted from the LED light source 102 toward the one region R1. However, as indicated by the optical paths Ld, Le, and Lf, the light emitted toward the other region R2 is not collected by the reflecting plate 103, so about half of the light emitted from the LED light source 102 is It becomes useless light, without being irradiated in the direction which the lighting fixture 101 illuminates.

  In addition to the above, there is known a lighting fixture that has a reflector and a lens and collects and emits light emitted from the LED light source in a direction orthogonal to the optical axis of the LED light source (for example, a patent). Reference 2). The lens emits a part of the light emitted from the LED light source and not incident on the reflection plate, and condenses the light. However, this luminaire is not configured such that all of the light that is not incident on the reflector is incident on the lens, and between the incident range that is incident on the reflector and the incident range that is incident on the lens. Since there is an interval and light passing through the interval is not collected, the light collection performance is not high.

JP 2008-251243 A JP 2008-226559 A

  The present invention solves the above-described problem, and an object of the present invention is to reduce the size of a lighting fixture and increase the light collecting performance in a lighting fixture that collects and emits light emitted from a light source.

  In order to achieve the above object, the invention of claim 1 is a lighting apparatus comprising a light source, a reflecting plate that reflects light emitted from the light source, and a lens that collects light emitted from the light source. The reflecting plate is arranged so that light emitted toward one region divided by a plane including the optical axis of the light source is incident and reflected toward the other region, and the lens Is arranged so that light emitted from the light source toward the other region is incident, condensed, and emitted in the same direction as the reflected light from the reflecting plate.

  According to the first aspect of the present invention, the reflecting plate is sized to fit almost in the half area in front of the light source, and the lighting fixture is miniaturized. Also, among the light emitted from the light source, the light emitted toward the region is condensed by the reflecting plate, and all the light not incident on the reflecting plate is incident on the lens and collected. The light collecting performance of the instrument is increased.

The top view which looked at the lighting fixture which concerns on embodiment of this invention from the side from which light is radiate | emitted. AA sectional view taken on the line AA of FIG. Sectional drawing of the lens of the lighting fixture. Sectional drawing of the conventional lighting fixture. Sectional drawing of another conventional lighting fixture.

  A lighting apparatus according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the lighting fixture 1 is an LED lighting fixture, and includes an LED light source 21 as a light source, a reflector 3 that reflects light emitted from the LED light source 21, and the LED light source 21. And a lens 4 for collecting the emitted light. The reflector 3 receives light emitted toward one region R1 (in FIG. 2, below the optical axis A2) divided by the surface including the optical axis A2 of the LED light source 21, and transmits the light to the other side. It arrange | positions so that it may reflect toward area | region R2 (above optical axis A2 in FIG. 2). The lens 4 is disposed so that light emitted from the LED light source 21 toward the other region R2 is incident, the light is collected, and is emitted in the same direction as the light reflected by the reflecting plate 3. Here, the same direction is substantially the same direction in consideration of the accuracy of light distribution required for the lighting fixture 1, that is, substantially the same direction, and is not limited to the geometrically strict direction. The LED light source 21 is attached to the substrate 23 via the mount member 22 to constitute the LED unit 2. The lens 4 is attached to the LED unit 2. The LED unit 2 and the reflection plate 3 are supported by the support portion 5.

  The LED light source 21 of the LED unit 2 is an LED element that emits light when a current is passed. The mount member 22 is a member that relieves stress caused by a difference in coefficient of thermal expansion between the LED element and the substrate 23. The substrate 23 is a plate whose base material is made of an insulator or the like, for example, and is provided with a wiring pattern connected to the LED light source 21.

  The reflecting plate 3 is formed by molding a metal such as aluminum or a material such as a resin. When the material is a resin or the like, a light reflecting layer such as aluminum or silver is formed. The reflecting plate 3 has a concave reflecting surface 31. The reflective surface 31 is shaped to obtain a desired light distribution by reflected light. The reflecting surface 31 is, for example, a part of a rotating paraboloid obtained by rotating a parabola around the rotational symmetry axis A1. The rotational paraboloid has a focal point near the center 24 of the light emitting surface of the LED light source 21, and the rotational symmetry axis A <b> 1 is substantially orthogonal to the optical axis A <b> 2 of the LED light source 21. The reflecting surface 31 has a shape obtained by cutting the paraboloid about half in a plane parallel to the rotational symmetry axis A1. The solid angle of the region R1 facing the reflector 3 from the LED light source 21 is about 1/4 of the total solid angle. The periphery of the opening of the reflecting plate 3 is substantially semicircular in plan view, and the flange 32 extends. The flange 32 improves the strength of the reflector 3 and may be omitted.

  The lens 4 is a condensing lens, and the lens shape is, for example, a part of a rotating body shape centering on a rotational symmetry axis A3 as shown in FIG. In this lens shape, a concave portion 41 is formed on the light incident side, and the first incident surface 42 located on the side surface of the concave portion and the light incident into the lens 4 from the first incident surface 42 are arranged. It has a reflection surface 43 that totally reflects, a second incident surface 44 that is located on the bottom surface of the recess, and an emission surface 45 that emits light from within the lens 4. The emission surface 45 emits the light reflected by the reflection surface 43 and the light incident on the lens 4 from the second incident surface 44. The lens 4 is molded into a shape in which this rotationally symmetric shape is cut in substantially half by a plane 46 parallel to the rotational symmetry axis A3. Further, the lens 4 has a flange 47 formed on the periphery of the emission surface 45. The flange 47 is fixed to the support portion 5 by an appropriate member (not shown). The flange 47 may be omitted.

  The lens 4 is arranged so that its focal point is aligned with the center 24 of the light emitting surface of the LED light source 21. The solid angle of the region R2 facing the first incident surface 42 and the second incident surface 44 from the LED light source 21 is about ¼ of the total solid angle. As indicated by the optical path Lg, the light emitted from the LED light source 21 and incident on the first incident surface 42 is collected by total reflection on the reflecting surface 43. As indicated by the optical path Lh, the light incident on the second incident surface 44 is collected by refraction at the second incident surface 44. The light condensed by the lens 4 is emitted from the emission surface 45 as substantially parallel light.

  The support 5 is a flat plate member (see FIG. 2). The support 5 may be formed in a bottomed box shape having an opening. The luminaire 1 is installed by attaching the support portion 5 to an outer wall of a building, an indoor wall surface, or the like.

  In the luminaire 1 configured as described above, the light emitted from the LED light source 21 is emitted toward a spatial region in front of the LED light source 21, that is, a region of about ½ of all solid angles. Half of the region is one region R1 divided by the plane including the optical axis A2 of the LED light source 21, and the other half is the other region R2 divided in the same manner. The light emitted from the LED light source 21 toward the one region R1 is incident on the reflection plate 3 as indicated by optical paths La, Lb, and Lc in FIG. 2, and is directed toward the other region R2. The light is reflected in a direction substantially orthogonal to A2 and condensed into substantially parallel light. The light emitted toward the other region R2 enters the lens 4 and is emitted in substantially the same direction as the light reflected by the reflecting plate 3, as indicated by the optical paths Lg and Lh.

  In this way, the reflector 3 has a size that can almost fit in the half region R1 in front of the LED light source 21, and the lighting fixture 1 is downsized. Of the light emitted from the LED light source 21, the light emitted toward the region R <b> 1 is condensed by the reflecting plate 3, and all the light not incident on the reflecting plate 3 is incident on the lens 4 and condensed. Therefore, the light collecting performance of the lighting fixture 1 is improved.

  When this luminaire 1 is used, for example, for lighting up a building, the luminaire 1 is miniaturized, so that the beauty of the building is not impaired. Moreover, since the light collecting performance of the luminaire 1 is high, the building is efficiently lit up, and even if there is a person near the building, direct light from the luminaire 1 enters the human eye. It is prevented.

  In addition, this invention is not restricted to the structure of said embodiment, A various deformation | transformation is possible in the range which does not change the summary of invention. For example, the light source of the lighting fixture 1 may be a small HID lamp or the like.

1 Lighting fixture 21 Light source (LED light source)
3 Reflector 4 Lens A2 Optical axis

Claims (1)

In a luminaire comprising a light source, a reflecting plate that reflects light emitted from the light source, and a lens that collects light emitted from the light source,
The reflector is disposed so that light emitted toward one region divided by a plane including the optical axis of the light source is incident and reflected toward the other region,
The lens is arranged such that light emitted from the light source toward the other region is incident, and the light is collected and emitted in the same direction as the reflected light from the reflecting plate. Lighting equipment to do.

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