Luminaire

Abstract

To provide a luminaire which can correctly sense brightness, while achieving compactification.SOLUTION: In a luminaire, on one surface side of a sensor substrate 5 provided in a housing 1, a human detection sensor 51 and an illuminance sensor 52 are provided and the human detection sensor 51 is arranged so as to protrude to the one surface side with respect to the illuminance sensor 52, and on the one surface side of the sensor substrate 5, an external light take-in through passage 65 is provided in which one end is opened to the outside and the other end is arranged opposing to the illuminance sensor 52. A light guide rod 7 is provided at the external light take-in through passage 65, and external light is taken in the illuminance sensor 52 via the light guide rod 7.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a lighting fixture such as a sensor-equipped downlight provided with a motion sensor and an illuminance sensor. [Background technology]

[0002] Downlights installed under eaves, at indoor entrances, in corridors, etc., are well known that are equipped with a motion sensor and turn on the light when the sensor detects the approach of a person. Furthermore, the following Patent Document 1 discloses a downlight that is provided with an illuminance sensor that detects the brightness of the surroundings in addition to the motion sensor. This downlight is configured not to turn on the light when the surroundings are bright, even if a person approaches.

[0003] FIG. 6 is a cross-sectional view showing the periphery of a sensor unit in a conventional downlight with a human sensor and an illuminance sensor. As shown in the figure, a sensor board 112 is provided inside a housing 101, and a human sensor 113 and an illuminance sensor 114 are attached to the lower surface side of the sensor board 112. The human sensor 113 is larger in size than the illuminance sensor 114, and is particularly long in the vertical dimension, and is disposed in a state of protruding downward. A peripheral wall portion 111 is formed around the human sensor 113, and the human sensor 113 is disposed within this peripheral wall portion 111. A gap 115 for taking in external light is formed between the human sensor 113 and the peripheral wall portion 111 in correspondence with the illuminance sensor 114. This downlight is configured to take in external light through the gap 115 for taking in external light into the illuminance sensor 114 to sense the brightness around the downlight.

[0004] In this downlight, costs are reduced by mounting two sensors 113, 114 on one sensor board 112. However, as already mentioned, when one sensor board 112 is used for the two sensors 113, 114, the dimension of the human presence sensor 113 in the vertical direction is longer than that of the illuminance sensor 114, and while the lower surface of the human presence sensor 113 is arranged in a state where it is exposed on the lower surface of the downlight, the illuminance sensor 114 is arranged in a position recessed above the lower surface of the downlight, and the external light intake gap 115 becomes elongated.

[0005] On the other hand, in recent years, there has been a demand for downlights to be made smaller and more compact, and in order to meet this demand, it is desirable to adopt a configuration in which the components around the illuminance sensor 114 are closely spaced and densely arranged. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent Publication No. 2022-124804 Summary of the Invention [Problem to be solved by the invention]

[0007] However, in a conventional downlight as shown in Fig. 6, if the spacing between the components around the illuminance sensor 114 is narrowed to make the downlight smaller and more compact, the gap 115 for taking in external light between the peripheral wall 111 and the motion sensor 113 will be narrowed even further. This may result in a problem that sufficient external light cannot be taken in through the narrow gap 115 for taking in external light, and the illuminance sensor 114 will not be able to accurately sense the brightness around the downlight.

[0008] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a lighting fixture such as a downlight with a sensor that is small and compact, while being able to accurately detect brightness using an illuminance sensor. [Means for solving the problem]

[0009] In order to solve the above problems, the present invention comprises the following means.

[0010] [1] A lighting fixture in which a human presence sensor and an illuminance sensor are provided on one side of a sensor substrate provided within a housing, the human presence sensor being disposed so as to protrude on one side relative to the illuminance sensor, and a through passage for taking in external light is provided on one side of the sensor substrate, the through passage having one end open to the outside and the other end disposed opposite the illuminance sensor, A lighting fixture characterized in that a light guiding rod is provided in the external light intake through passage, and external light is taken in by the illuminance sensor through the light guiding rod.

[0011] [2] A lighting fixture as described in paragraph 1 above, in which an engaging protrusion is provided on the light guide rod, and an engaging step portion corresponding to the engaging protrusion is provided on a through passage forming wall that constitutes the through passage for taking in external light, and the engaging protrusion engages with the engaging step portion to prevent the light guide rod from coming loose.

[0012] [3] The lighting device according to paragraph 1 or 2, wherein a large diameter portion is formed at the end of the light guide rod facing the illuminance sensor. Effect of the Invention

[0013] According to the lighting fixture of the invention [1], even though the illuminance sensor is located at the back of the through passage for taking in external light, the light guide rod is provided in the through passage for taking in external light, so that the external light around the lighting fixture can be efficiently and reliably taken in by the illuminance sensor through the light guide rod, and the illuminance sensor can accurately detect the brightness around the lighting fixture. Furthermore, even if the components around the illuminance sensor are closely spaced, the lighting fixture can take in external light through the light guide rod without hindrance, so that it can be made small and compact.

[0014] According to the lighting fixture of invention [2], an engaging protrusion is formed on the light guide rod, and an engaging step portion for engaging the engaging protrusion is formed on the through passage forming wall that constitutes the through passage for taking in external light, so that the light guide rod can be reliably prevented from falling out.

[0015] According to the lighting device of invention [3], a large diameter portion is formed at the end of the light guide rod facing the illuminance sensor, so that a large surface area of ​​the light guide rod facing the illuminance sensor can be secured. This allows sufficient external light to be emitted from the light guide rod to the illuminance sensor, enabling the illuminance sensor to detect brightness with even greater accuracy. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a side view showing a downlight as a lighting fixture according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view of the downlight of the embodiment, which corresponds to the cross section taken along line II-II in FIG. [Diagram 3] FIG. 3 is a bottom view showing the downlight of the embodiment. [Figure 4] FIG. 4 is a side cross-sectional view of the periphery of the sensor unit of the downlight of the embodiment, and corresponds to the cross section taken along line IV-IV in FIG. [Diagram 5] FIG. 5 is an enlarged cross-sectional view showing a main part of FIG. [Figure 6] FIG. 6 is a side cross-sectional view of the periphery of a sensor unit of a conventional downlight. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] FIG. 1 is a side view showing a downlight as a lighting fixture according to an embodiment of the present invention, FIG. 2 is a cross-sectional view, FIG. 3 is a bottom view, and FIG. 4 is a side cross-sectional view of the periphery of a sensor unit of the downlight according to the embodiment.

[0018] As shown in these drawings, the downlight of this embodiment includes a housing 1 having a recess that opens downward. The upper part of this housing 1 is configured as a heat sink part 11.

[0019] In addition, a circular mounting frame 2 is provided at the lower end opening of the housing 1. A flange (trim) 21 is provided at the lower end of the mounting frame 2 so as to protrude outward, and a pair of mounting springs 22 are attached to the upper surface side of the flange 21 for mounting the downlight to a wall such as a ceiling.

[0020] Furthermore, a cone 3 is provided inside the mounting frame 2, corresponding to the recessed portion of the housing 1. The cone 3 is formed in an umbrella shape (cone shape) with a small diameter at the upper end and a large diameter at the lower end, and the outer periphery of the lower end is provided at the lower end of the mounting frame 2.

[0021] A lens 31 is provided at the upper end opening of the cone 3, and an LED module 32 serving as a light source module is provided inside the housing 1 above the lens 31. Illumination light emitted from the LED module 32 is configured to be emitted downward (in one direction) via the lens 31.

[0022] As shown in Fig. 3, a semicircular opening 35 is provided on a part of the outer periphery of the cone 3, and a semicircular closing plate 4 is provided so as to close this opening 35. A sensor insertion hole 41 is provided in the closing plate 4. Furthermore, as shown in Fig. 4, a sensor board 5 is arranged above the closing plate 4, and a human presence sensor 51 is attached to the lower surface (one surface) of the sensor board 5 in correspondence with the sensor insertion hole 41, and an illuminance sensor 52 is attached next to the human presence sensor 51. The human presence sensor 51 has a height dimension (vertical dimension) greater than that of the illuminance sensor 52, and is arranged so as to protrude downward.

[0023] Further, a mounting member 6 is provided on the underside of the sensor board 5, and this mounting member 6 has a peripheral wall portion 61 that surrounds the periphery of the human sensor 51 and is arranged to pass through the sensor insertion hole 41 of the closure plate 4. The human sensor 51 is arranged in a state where it passes through the peripheral wall portion 61 of the mounting member 6, and is arranged so that the lower end surface of the human sensor 51 protrudes slightly downward from the lower end opening surface of the downlight (the lower surface of the flange 21).

[0024] 3 to 5, the peripheral wall 61 of the mounting member 6 is formed so that a portion corresponding to the illuminance sensor 52 bulges outward, and this bulging portion is configured as a through-path forming wall 611. A tunnel-shaped through-path 65 for taking in external light that penetrates in the vertical direction is provided within the through-path forming wall 611. As shown in FIG. 5, the lower end side (one end side) of the through-path 65 for taking in external light is open downward (to the outside), and the upper end side (the other end side) is disposed opposite the illuminance sensor 52.

[0025] A light guiding rod 7, also called a light guide or light guide rod, is housed in a fitted state in the external light intake through passage 65. The light guiding rod 7 is made of, for example, a transparent resin molded product. The lower end face (one end face) of the light guiding rod 7 in the external light intake through passage 65 is open downward (outside), and the upper end face (the other end face) is disposed facing the illuminance sensor 52. In this embodiment, external light that enters the light guiding rod 7 from its lower end face passes through the light guiding rod 7 and is irradiated from the upper end face toward the illuminance sensor 52, so that the external light is taken into the illuminance sensor 52 via the light guiding rod 7.

[0026] The upper end of the light guiding rod 7 is formed as a large diameter portion 71 having a larger radial dimension than the lower end thereof. This large diameter portion 71 is configured as an engagement protrusion that protrudes in a direction perpendicular to the external light intake through passage 65 (horizontal direction) as shown in FIG.

[0027] In addition, an engagement step 62 is formed in the through passage forming wall 611 corresponding to the large diameter portion (engagement protrusion) 51, and the large diameter portion (engagement protrusion) 71 of the light guiding rod 7 engages with the upper surface side of this engagement step 62, thereby reliably preventing the light guiding rod 7 from falling out downward.

[0028] Furthermore, since the large diameter portion 71 is provided at the upper end of the light guide rod 7, i.e., the portion facing the illuminance sensor 52, the area of ​​the surface (upper end surface) of the light guide rod 7 facing the illuminance sensor 52 is increased, and a sufficient amount of external light can be emitted from the upper end surface of the light guide rod 7 to the illuminance sensor 52.From this point of view, the light sensor 52 is configured to take in external light more efficiently.

[0029] In the downlight of this embodiment, basically, when the motion sensor 51 detects that a person is approaching, the LED module 32 lights up to provide illumination. However, even if a person approaches, if the illuminance sensor 52 detects that the surroundings are bright, the LED module 32 will not light up.

[0030] According to the downlight of this embodiment having the above configuration, although the illuminance sensor 52 is disposed at a recessed position (the other end) of the external light taking-in through passage 65, since the light guiding rod 7 is fitted in the external light taking-in through passage 65, external light around the downlight can be reliably taken in by the illuminance sensor 52 via the light guiding rod 7. Therefore, the illuminance sensor 52 can be accurately operated according to the surrounding brightness, and the brightness can be detected by the illuminance sensor 52 with high accuracy.

[0031] Furthermore, the downlight of this embodiment can efficiently take in external light through the light guiding rod 7 to the illuminance sensor 52, so that even if the components around the illuminance sensor 52 are closely spaced and densely arranged, external light can be reliably taken in by the illuminance sensor 52 and brightness can be accurately detected, making it possible to easily make the downlight small and compact.

[0032] Furthermore, in the downlight of this embodiment, a large diameter portion (engaging protrusion) 51 is formed at the upper end of the light guide rod 7, and an engaging step portion 62 that engages with the large diameter portion 51 is formed in the through passage forming wall 611 that constitutes the through passage 65 for taking in external light. This reliably prevents the light guide rod 7 from falling off, and also reliably prevents problems such as the light guide rod 7 becoming dislodged, allowing the light guide rod 7 to be properly installed.

[0033] Furthermore, in the downlight of this embodiment, the upper end of the light guide rod 7 facing the illuminance sensor 52 is formed into a large diameter portion 51, so that the upper end face of the light guide rod 7 (the face facing the illuminance sensor 52) can be made large, allowing sufficient external light to be emitted from the light guide rod 7 to the illuminance sensor 52, enabling the illuminance sensor 52 to detect brightness with even greater accuracy.

[0034] In the present invention, the through passage 65 for taking in external light is not necessarily limited to one intentionally formed in the shape of a passage, but may be an appropriate gap provided between a human presence sensor or the like and the surrounding area provided around it, as in the conventional method described above, formed as a through passage for taking in external light.

[0035] In addition, in the present invention, a through-path forming wall is formed around the through-path for taking in external light, but this through-path forming wall does not necessarily have to be formed. What is necessary is that there is a gap (through-path for taking in external light) that can take in external light corresponding to the illuminance sensor, and a light guiding rod is provided in the gap.

[0036] In the above embodiment, the engaging protrusion also serves as the large diameter portion 71, but the present invention is not limited to this. The engaging protrusion and the large diameter portion may be formed separately. [Industrial Applicability]

[0037] The lighting fixture of the present invention can be suitably used as a sensor-equipped downlight or the like provided with a motion sensor and an illuminance sensor. [Explanation of symbols]

[0038] 1: Housing 5: Sensor board 51: Motion sensor 52: Illuminance sensor 611: Through-path forming wall 62: Engagement stepped part 65: Passageway for letting in outside light 7: Light guide rod 71: Large diameter portion (engagement protrusion)

Claims

1. A lighting fixture in which a human presence sensor and an illuminance sensor are provided on one side of a sensor substrate provided within a housing, the human presence sensor being disposed so as to protrude on one side relative to the illuminance sensor, and a through passage for taking in external light is provided on one side of the sensor substrate, the through passage having one end open to the outside and the other end disposed opposite the illuminance sensor, A lighting fixture characterized in that a light guiding rod is provided in the external light intake through passage, and external light is taken in by the illuminance sensor through the light guiding rod.

2. The lighting fixture of claim 1, wherein an engaging protrusion is provided on the light guide rod, and an engaging step portion corresponding to the engaging protrusion is provided on a through passage forming wall that constitutes the through passage for taking in external light, and the engaging protrusion engages with the engaging step portion to prevent the light guide rod from coming loose.

3. 3. The lighting fixture according to claim 1, wherein the light guide rod has a large diameter portion at an end portion facing the illuminance sensor.

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