JP2011070959A - Luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a luminaire capable of adjusting a beam divergence. <P>SOLUTION: The luminaire includes a mounting member 30 formed in a shape of a column, a plurality of light emitting diodes 11 arranged on a peripheral surface of the mounting member 30, and a reflector 20 having a reflecting surface 21 formed in a shape of a bowl with a paraboloid with its center axis aligned with a center axis of the mounting member 30 and with its focal point B overlapping an end part (upper end part) of the mounting member 30 in a center axis direction. The light emitting diodes 11 are divided into three groups of an upper light source 11a, a central light source 11b, and a lower light source 11c depending on their mounting positions on the mounting member 30. The light emitting diodes 11 are connected in series or in parallel with respect to each group. Each series circuit (parallel circuit) of the light emitting diodes 11 is connected to a lighting device through a switching device, and the series circuit to be connected to the lighting device is switched by the switching device. By switching the light emitting diodes 11 to be turned on, a relative position of a light emitting position and the reflecting surface is changed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a luminaire that illuminates a certain region or object by radiating light from a light source reflected by a reflecting surface, such as a downlight or a projector.

  This type of luminaire is classified into a narrow-angle shape, a medium-angle shape, and a wide-angle shape according to the size of the beam opening, and is used according to the application and use environment.

  The opening of the beam can be changed by preparing in advance a plurality of types of reflectors having different reflection surface shapes and selecting the reflector to be used from the plurality of types of reflectors.

  Further, as in the lighting fixture shown in FIG. 4, one of the reflector 20 and the mounting member 30 to which the light source 11 is attached is movable, and the light beam L is changed by changing the relative position between the reflector 20 and the light source 11. It is conceivable to change the beam opening as shown in FIG.

  Or the lens body 13 provided with the lens 12 inserted between the light source 11 and the reflective surface 21 like the lighting fixture shown in FIG. 5 is attached to the attachment member 30 to which the light source 11 is attached movably. It is conceivable to change the beam opening by moving the lens body 13 to change the incident angle of the light to the reflecting surface 21 (see, for example, Patent Document 1).

JP 2004-296249 A

  However, when the technique for selecting the type of the reflector is used, there is a problem that a plurality of types of reflectors having different reflection surface shapes are required.

  Further, in the case of using a technique in which the attachment member 30 or the reflector 20 (see FIG. 4) is movable, there is a problem that a movable mechanism that allows the attachment member 30 or the reflector 20 to move is necessary.

  Furthermore, when a technique for moving the lens 12 (see FIG. 5) is used, there is a problem that a movable mechanism that makes the lens 12 movable is necessary.

  This invention is made | formed in view of the said reason, The objective is to provide the lighting fixture which can adjust the opening of a beam, without providing a movable mechanism with one type of reflector.

  The present invention provides a mounting member, a plurality of light emitting diodes which are light sources attached to the mounting member and have different mounting positions in a direction along the straight line passing through the mounting member, and around the straight line so as to form an opening. A reflector having a reflecting surface surrounding the light emitting diode and emitting light from the light emitting diode reflected by the reflecting surface from the opening of the reflecting surface, and the reflecting surface becomes smaller as each cross section along the opening is separated from the opening; In addition, a light-emitting diode that is formed to have a curved cross section that intersects the opening and is lit from a plurality of light-emitting diodes is selected.

  It is desirable that a light emitting diode different from the light emitting diode is attached to the opening side of the reflection surface of the attachment member.

  According to the configuration of the present invention, since the light emitting diode to be lit is selected from the plurality of light emitting diodes, the light emitting position can be changed with respect to the reflecting surface by changing the selected light emitting diode. There is an advantage that the opening of the beam can be adjusted without providing a movable mechanism with a kind of reflector.

  Further, since the light emitting diode is provided on the opening side of the reflection surface of the mounting member, there is an advantage that unevenness in illuminance on the illuminated surface can be reduced.

It is a partially broken side view of this embodiment, (a), (b), (c) is a diagram showing different states of light-emitting diodes to be lit. It is the partially broken side view of the other form same as the above, (a), (b), (c) is a figure which shows the state from which the light emitting diode to light is different, respectively. It is a partially broken side view of another form same as the above. It is a partially broken side view which shows a prior art example, (a), (b), (c) is a figure which shows the state from which the relative position of a light emitting diode and a lens each differs. It is a partially broken side view showing another conventional example.

  As shown in FIG. 1, the lighting fixture of the present embodiment has a configuration including a plurality of light emitting diodes 11 and a reflector 20 including a reflecting surface 21 that reflects light from the light emitting diodes 11. Hereinafter, the vertical direction in FIG. 1 will be described as the vertical direction.

  The reflecting surface 21 is formed in a saddle shape that is depressed with a paraboloid (a curved surface formed by rotating a parabola around the axis of symmetry). That is, the reflecting surface 21 has a central axis A that coincides with the vertical direction and has an opening on the lower side.

  The light emitting diode 11 is fixed at a fixed position surrounded by the reflection surface 21 using the attachment member 30. The attachment member 30 is formed in a columnar shape whose central axis is long in the central axis direction (vertical direction) coinciding with the central axis of the reflecting surface 21, and whose upper end is fixed at a fixed position overlapping the focal point B of the reflecting surface 21. Surrounded by surface 21.

  The light emitting diodes 11 are arranged on the circumferential surface of the mounting member 30 so as to be aligned in the circumferential direction and the vertical direction of the mounting member 30, and are mounted on the mounting member 30. The light emitting diodes 11 are divided into a plurality of groups according to the positions on the peripheral surface of the mounting member 30, and are connected in series or in parallel for each group. That is, one series circuit (or parallel circuit) is created in one group.

  The grouping is performed according to the vertical position of the light emitting diodes 11. In the illustrated example, the group of light emitting diodes 11 attached to the upper part of the peripheral surface of the attachment member 30 is an upper light source 11a, and the group of light emitting diodes 11 attached to the center part of the peripheral surface of the attachment member 30 is a central light source 11b. The group of light emitting diodes 11 attached to the lower part is a lower light source 11c, and the light emitting diodes 11 are divided into three groups.

  The series circuit of the light emitting diodes 11 of each group is switched to the lighting device (not shown) by a switching device (not shown). For example, a constant voltage source that outputs a constant voltage is used for the lighting device.

  The switching device includes, for example, three switching elements. The switching elements are respectively connected between each series circuit of the light emitting diodes 11 and the lighting device, and ON / OFF is controlled by the control device. The control device includes an operation input unit, and outputs a control signal for controlling on / off of the switching element in a wired or wireless manner in accordance with an input to the operation input unit. The control device connects one series circuit of the three series circuits of the light emitting diodes 11 to the lighting device according to the control signal. That is, only the light emitting diodes 11 of one group selected by the control device are connected to the lighting device and light up.

  Instead of the switching element, a relay may be connected between the series circuit (or parallel circuit) of the light emitting diodes 11 and the lighting device, and the group of the light emitting diodes 11 that are turned on by the relays may be switched.

  As described above, since the upper end portion of the mounting member 30 overlaps the focal point B of the reflecting surface 21, when the light emitting diode 11 (hatched light emitting diode in FIG. 1A) of the upper light source 11a is turned on, the light emitting position is reflected. Light that is substantially coincident with the focal point B of the surface 21 and has a small beam opening is emitted from the opening of the reflecting surface 21 as indicated by the light ray L. That is, the lighting fixture has a narrow-angle shape.

  When the light emitting diode 11 (hatched light emitting diode in FIG. 1C) of the lower light source 11c is turned on, the light emission position is below the focal point B of the reflecting surface 21, and the beam opens as shown by the light beam L. Large light is emitted from the opening of the reflecting surface 21. That is, the luminaire has a wide-angle shape.

  When the light-emitting diode 11 (hatched light-emitting diode in FIG. 1B) of the central light source 11b is connected to the lighting device and lit, the beam is opened when the light-emitting diode 11 of the upper light source 11a is turned on and when the lower light source 11c is turned on. This is intermediate between the case where the light emitting diode 11 is turned on. That is, the luminaire has a medium square shape.

  As described above, in this embodiment, the opening of the beam is changed by changing the lighting among the upper light source 11a, the central light source 11b, and the lower light source 11c, and the lighting fixture is made into a narrow-angle shape, a medium-angle shape, or a wide-angle shape. be able to. Further, the opening (light distribution) of the beam can be changed only by an input operation to the control device, and switching of the light distribution is easy.

  In the above-described configuration, the example in which the mounting member 30 is disposed so that the upper end portion overlaps the focal point B of the reflecting surface 21 has been described. However, the mounting member 30 has the lower end portion at the focal point B of the reflecting surface 21 as illustrated in FIG. It can also arrange so that it may overlap.

  In the configuration shown in FIG. 2, the lighting fixture has a narrow-angle shape when the light-emitting diode 11 of the lower light source 11c is turned on, and has a middle-angle shape when the light-emitting diode 11 of the central light source 11b is turned on, and the lower light source 11c. When the light emitting diode 11 is turned on, it becomes wide-angle.

  Further, as shown in FIG. 3, the light emitting diodes 11 that are not grouped may be attached to the attachment member 30 downward. The light emitting diode 11 emits light downward as indicated by the light ray L. The light emitting diode 11 can reduce unevenness in illuminance on the illuminated surface irradiated with light from the lighting fixture.

  Furthermore, in the above-described configuration, the example in which the reflecting surface 21 is formed in a bowl shape with a parabolic surface has been described. However, the reflecting surface 21 is a spherical surface or an elliptical surface formed by rotating an ellipse around a short axis or a long axis. It can also be formed in a bowl shape. Further, the reflecting surface 21 can also be formed in a trumpet shape, such as a curved surface formed by rotating a hyperbola around an axis of symmetry or a curved surface formed by rotating an exponential function.

11 Light emitting diode 20 Reflector 21 Reflecting surface 30 Mounting member

Claims (2)

  An attachment member, a light source attached to the attachment member, a plurality of light emitting diodes having different attachment positions in a direction along a straight line passing through the attachment member, and the light emitting diodes are surrounded around the straight line so as to form an opening And a reflector that radiates light from the light emitting diode reflected by the reflecting surface from the opening of the reflecting surface, the reflecting surface is reduced so that each cross section along the opening gets away from the opening, and A lighting apparatus, wherein a light-emitting diode that is lighted from a plurality of light-emitting diodes is selected so that a cross section that intersects the opening is curved.   The light fixture according to claim 1, wherein a light emitting diode different from the light emitting diode is attached to an opening side of the reflection surface of the attachment member.

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