JP2014007102A - Lighting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting apparatus which can be made compact.SOLUTION: A lighting apparatus includes a first reflection plate 3 having a first emission-side opening 33 from which light of a light emitting diode 10 as a light source is emitted, and a second reflection plate 5 having a second incidence-side opening 51 on which the light emitted from the first emission-side opening 33 is made incident and a second emission-side opening 52 from which the light is emitted. The second emission-side opening 52 is formed small enough to make part of direct light of the light emitting diode 10, which is emitted from the first emission-side opening 33 without being reflected by the first reflection plate 3, incident on an inner peripheral surface of the second reflection plate 5. The lighting apparatus can be made compact as compared with a case in which the direct light of the light emitting diode 10 is not made incident on the second reflection plate 5 at all.

Description

  The present invention relates to a lighting fixture.

  Conventionally, a first reflector that has a cylindrical shape that reflects light from the light source on the inner peripheral surface and has a first light exit opening that emits light from the light source, and light that is emitted from the first light exit is incident on the first reflector. There is provided a luminaire including a cylindrical second reflector having two incident side openings and a second emission side opening from which the above light is emitted. In the lighting fixture as described above, by providing the second reflecting plate, a light distribution different from the case of only the first reflecting plate is possible.

  In the above conventional example, light from the light source (direct light) emitted from the first emission side opening without being reflected by the first reflection plate is not incident on the inner peripheral surface of the second reflection plate. The range of the solid angle of the second exit side opening as viewed is larger than the range of the solid angle of the first exit side opening (see, for example, Patent Document 1).

JP 2010-205660 A

  In order to make the solid angle range of the second emission side opening as viewed from the light source larger than the solid angle range of the first emission side opening as described above, the solid angle range of the first emission side opening is reduced. And a case where the range of the solid angle of the second exit side opening is increased.

  When the range of the solid angle of the first emission side opening viewed from the light source is reduced to narrow the emission range of the direct light, if the area of the first emission side opening is constant, the dimension in the axial direction of the first reflector is set. It is necessary to increase the distance between the first exit side opening and the light source.

  Further, when increasing the solid angle range of the second exit side opening as viewed from the light source, it is necessary to increase the area of the second exit side opening if the dimension in the axial direction of the second reflector is constant.

  In either case, the size is increased.

  This invention is made | formed in view of the said reason, The objective is to provide the lighting fixture which can be reduced in size.

  The luminaire of the present invention includes a light source, a first reflector having a first emission side opening for emitting the light of the light source, and a second incident side on which light of the light source emitted from the first emission side opening is incident. A second reflector having an opening and a second exit side opening from which the light from the light source exits, and the solid angle range of the first exit side opening is the second entrance from any position of the light source. A portion of the light that is within the range of the solid angle of the side opening and that has exited from the first exit side opening without being reflected by the first reflector after exiting from the light source is directed to the second reflector. It is characterized by being incident.

  According to the present invention, the first emission side opening and the light source are compared with the case where light emitted from the first emission side opening without being reflected by the first reflection plate after being emitted from the light source is not incident on the second reflection plate at all. It is possible to reduce the size by reducing the distance between the second output side opening and the second exit side opening.

It is explanatory drawing which shows schematic structure of embodiment of this invention. It is a partially broken front view showing the same. It is a perspective view which shows the same as the above. It is explanatory drawing which shows the comparative example same as the above.

  Hereinafter, the best mode for carrying out the present invention will be described with reference to FIGS. Hereinafter, the vertical direction will be described with reference to FIG.

  In this embodiment, as shown in FIGS. 2 and 3, a substrate 11 whose thickness direction is directed in the vertical direction, a light emitting diode 10 as a light source mounted on the substrate 11, and an instrument body on which the substrate 11 is fixed. 2 is provided. Since the heat radiation of the light emitting diode 10 is mainly performed through the instrument main body 21, it is desirable to use a material (for example, aluminum) having a high thermal conductivity as much as possible. As shown in FIG. 3, the light emitting diode 10 is electrically connected via a cable 61 to a power supply device 6 that generates power for lighting the light emitting diode 10. The power supply device 6 converts, for example, AC power input from the outside into appropriate DC power. Such a power supply device 6 can be realized by using a well-known switching power supply. Is omitted.

  A first reflector 3 that reflects light from the light emitting diode 10 is attached to the lower side of the instrument body 2. The first reflecting plate 3 has a main body 31 that reflects the light of the light-emitting diode 10 on the inner peripheral surface, and has an annular shape with the axial direction directed vertically. The inner peripheral surface of the main body 31 has an axisymmetric shape (for example, a parabolic shape) with respect to an axis parallel to the vertical direction, that is, a cross-sectional shape in a cross section perpendicular to the vertical direction is a circular shape. Further, the main body 31 has a lower opening (hereinafter referred to as a “first opening”) from which the light is emitted from an upper opening 32 (hereinafter referred to as a “first incident side opening”) through which the light of the light emitting diode 10 is incident. The inner diameter is gradually increased over 33 ”. Instead of disposing the first reflector 3 below the light emitting diode 10 and causing the light of the light emitting diode 10 to enter from the first incident side opening 32 as described above, the first reflector 3 causes the light emitting diode 10 to be incident. You may make it surround.

  Furthermore, the present embodiment includes a translucent cover 41 that is made of a translucent material (for example, glass) and covers the first emission side opening 33 when viewed from below. The first reflector 3 is provided with a cover housing portion 34 for housing the translucent cover 41, projecting radially outward from the lower end of the main body portion 31. Further, the translucent cover 41 is provided with an annular packing 42 made of an elastic material such as synthetic rubber and closing the gap between the outer peripheral end of the translucent cover 41 and the cover storage portion 34. . The translucent cover 41 and the packing 42 are, for example, screwed to the cover housing portion 34 and are attached to the first reflector by an annular mounting frame 43 that sandwiches the translucent cover 41 and the packing 42 between the cover housing portion 34. 3 is fixed.

  Further, in the present embodiment, the second reflecting plate 5 covers the outer peripheral surface of the second reflecting plate 5 and the ring-shaped second reflecting plate 5 that reflects the light emitted from the first emitting side opening 33 on the inner peripheral surface. 5 and a frame body 22 that is coupled to the instrument main body 21. The second reflecting plate 5 is made of, for example, a metal plate, and is fixed to the frame 22 by caulking, for example. Moreover, the coupling | bonding of the frame 22 and the instrument main body 21 is achieved by screwing, for example.

  Here, the frame body 22 has a cylindrical main body portion 221 opened up and down, and a flange portion 222 projecting radially outward from the lower end of the main body portion 221. Further, the outer peripheral surface of the main body portion 221 of the frame body 22 is made of a leaf spring, and one end portion is fixed to the frame body 22 and elastically deformed so that the other end portion is displaced up and down with respect to the frame body 22. A plurality of (three in the figure) possible attachment springs 23 are attached.

  In this embodiment, it is embedded in an embedding hole (not shown) provided in the ceiling material, and each mounting spring 23 is supported to the ceiling material by elastically contacting the ceiling material from above. The In the state of being embedded, the gap between the outer peripheral surface of the main body portion 221 of the frame body 22 and the inner peripheral surface of the embedded hole is covered with the flange portion 222 when viewed from below.

  Further, the inner peripheral surface of the second reflecting plate 5 has an axisymmetric shape (for example, a parabolic shape) with respect to a common axis with the inner peripheral surface of the first reflecting plate 3, that is, in a cross section perpendicular to the vertical direction. The cross-sectional shape is circular. Further, the second reflector 5 has a lower side from which the above light is emitted from an upper opening (hereinafter referred to as “second incident side opening”) 51 through which light emitted from the first emission side opening 33 enters. The inner diameter is gradually increased over the first opening 52 (hereinafter referred to as “second emission side opening”).

  Hereafter, the characteristic part of this invention is demonstrated.

  In the present embodiment, the second incident side opening 51 has a solid angle range of the first emission side opening 33 within a certain range of the solid angle of the second incident side opening 51 from any position of the light emitting diode 10. Is sufficiently larger than the first emission side opening 33. Thereby, all the light emitted from the first exit side opening 33 enters the second entrance side opening 51 without leaking out of the second entrance side opening 51.

  A part of the light (hereinafter referred to as “direct light”) emitted from the first emission side opening 33 without being reflected by the first reflection plate 3 after being emitted from the light emitting diode 10 is part of the second reflection plate 5. The second emission side opening 52 is made sufficiently small so as to enter the inner peripheral surface. In other words, a part of the direct light of the light emitting diode 10 is emitted from the second emission side opening 52 through reflection on the inner peripheral surface of the second reflecting plate 5.

  Here, as shown in FIG. 1, the light emitting diode 10 that is a light source in the present embodiment, the first emission side opening 33, the second incident side opening 51, and the second emission side opening 52 are respectively common. It is a circular shape that is axially symmetric with respect to an axis (hereinafter, simply referred to as “symmetric axis”) 7. Therefore, the angle formed between the direction of emission of the direct light of the light emitting diode 10 from the first emission side opening 33 and the symmetry axis 7 is maximized because the direct light emitted from the end of the light emitting diode 10 is the same as that of the symmetry axis 7. This is when it passes through the end of one emission side opening 33. That is, in order to satisfy the above condition, as indicated by an arrow A1 in FIG. 1, the direct light emitted from the end of the light emitting diode 10 and passing through the axis of symmetry 7 and the end of the first emission side opening 33 is What is necessary is just to inject into the internal peripheral surface of the 2nd reflecting plate 5. FIG. In other words, in the plane of FIG. 1 including the symmetry axis 7, one end (for example, the left end in FIG. 1) of the light emitting diode 10 and the opposite end (for example, in FIG. 1) of the first emission side opening 33. The angle θ1 formed by the straight line connecting the right end) and the symmetry axis 7 is the line connecting the one end of the light emitting diode 10 and the opposite end of the second incident side opening 51 and the symmetry axis 7. And the angle θ3 formed by the straight line connecting the one end of the light emitting diode 10 and the opposite end of the second emission side opening 52 and the symmetry axis 7 is sufficient.

  According to the above configuration, as shown in FIG. 4, the distance D between the first emission side opening 33 and the light emitting diode 10 is compared with the case where no direct light from the light emitting diode 10 is incident on the inner peripheral surface of the second reflecting plate 5. It becomes possible to reduce the size by reducing the diameter R or the diameter R of the second emission side opening 52.

3 First Reflector 5 Second Reflector 10 Light Emitting Diode (Light Source)
33 First exit side opening 51 Second entrance side opening 52 Second exit side opening

Claims (1)

A light source;
A first reflector having a first exit side opening for emitting the light of the light source;
A second reflector having a second incident side opening through which light from the light source emitted from the first emission side opening and a second emission side opening from which the light from the light source is emitted;
When viewed from any position of the light source, the solid angle range of the first exit side opening is within the solid angle range of the second entrance side opening, and after being emitted from the light source, A part of light emitted from the first emission side opening without being reflected is incident on the second reflection plate.

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