JP2011243463A - Lighting fixture, and illumination system using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting fixture with deterioration of detection sensitivity of a radio wave-type sensor restrained, and to provide an illumination system using the same.SOLUTION: The lighting fixture A is provided with a light source 2, for instance, a fluorescent lamp or the like, a radio wave-type sensor 3 detecting existence of a human body in a given detection area, a lighting circuit for controlling an output power to the light source 2 based on a detected result of the sensor 3, a translucent panel 4 arranged between the light source 2 as well as the sensor 3 and an illuminated area, and a translucent member 5 fitted at a site facing the sensor 3 in the translucent panel 4 and adjusting a thickness dimension of the translucent panel 4. A thickness dimension of the translucent member 5 is set in accordance with an incident angle of an electromagnetic wave into the translucent panel 4 so as the electromagnetic wave reflected at the translucent panel 4 to be reduced.

Description

  The present invention relates to a lighting fixture and a lighting system using the same.

  Conventionally, lighting fixtures using human body detection sensors have been provided (see, for example, Patent Document 1). This luminaire turns on the illumination while the human body is detected by the sensor, and turns off the illumination after a certain period of time when the human body is no longer detected by the sensor. This lighting fixture can be used to prevent forgetting to turn off the lights, and it can be installed in places with low usage frequency such as stairs and passages of facilities because it can improve convenience, save energy, and be safe. It is becoming popular as a lighting fixture.

  As a sensor attached to such a lighting fixture, a PIR (Passive Infrared Radiation) sensor is often used. This PIR sensor is a passive sensor that senses temperature changes due to human movements and outputs predetermined signals. However, since such a PIR sensor has a narrow detection range and is not suitable for a place with a wide detection range such as a factory or a warehouse, an active type sensor with a wide detection range is used in such a place. Will be.

  An active sensor can detect the presence or absence of an object based on a difference between a signal transmitted by itself and a signal reflected and returned by an object (for example, a human body), and is passive such as a PIR sensor. High accuracy compared to the type sensor. Examples of such an active sensor include a millimeter wave sensor and a distance measuring sensor. In a millimeter wave sensor using radio waves, a millimeter wave transmitted toward a specific area and reflected by an object are returned. The presence or absence of an object can be detected by detecting the frequency difference from the millimeter wave.

  By the way, lighting fixtures installed in facilities such as stairs and passages are often mounted with a panel (for example, glass) in front of the light source in consideration of dazzling when looking directly and considering design. When the above-described PIR sensor is used, there is a possibility that the detection accuracy of the sensor is lowered by the panel. Therefore, a radio wave type sensor (for example, the above-mentioned millimeter wave sensor etc.) whose transmittance | permeability with respect to glass is higher than a PIR sensor is used for such a lighting fixture.

JP 2001-338522 A (paragraph [0021] -paragraph [0044] and FIGS. 1-9)

  However, even with the above-described radio wave type sensor, it is affected by the panel material and thickness, the distance between the panel and the sensor, and so on. It fluctuates greatly. For example, when the thickness of the panel is not set to an appropriate thickness, transmission loss due to reflection or attenuation becomes large, and as a result, the detection sensitivity may be greatly reduced.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a lighting fixture that suppresses a decrease in detection sensitivity of a radio wave sensor and a lighting system using the same. .

A lighting fixture according to the present invention includes a light source, a radio wave sensor that detects the presence or absence of a person in a predetermined detection area, a lighting circuit that controls output power to the light source based on a detection result of the sensor, a light source, and a sensor. A transparent panel disposed between the lighting area and the illumination area; and a transparent member provided in a portion facing the sensor in the transparent panel and adjusting a thickness dimension of the transparent panel. Is the thickness dimension of the translucent panel d, the wavelength of the electromagnetic wave transmitted from the sensor is λ, the relative permittivity of the translucent panel and the translucent member is ε _r , the incident angle of the electromagnetic wave to the translucent panel is φ, If the radome order is N,

The thickness dimension of the translucent member is set according to the incident angle so as to satisfy the above condition.

  In this lighting fixture, it is preferable that the translucent member is made of the same material as the translucent panel and is formed integrally with the translucent panel.

  The lighting system of the present invention includes a plurality of the above-described lighting fixtures.

  There is an effect that it is possible to provide a lighting apparatus and a lighting system in which a decrease in detection sensitivity of the radio wave sensor is suppressed.

It is a schematic diagram which shows the lighting fixture which concerns on this invention. It is a principal part detail drawing same as the above. It is a schematic block diagram same as the above.

  Below, embodiment of the lighting fixture which concerns on this invention is described based on FIGS. 1-3. As shown in FIG. 1, the lighting fixture A of this embodiment is attached to a wall surface W1, for example, and used to illuminate an illumination area such as a staircase or a passage.

  FIG. 1 is a schematic diagram showing a lighting fixture A of the present embodiment. The lighting fixture A includes a light source 2, a radio wave sensor 3 for detecting the presence or absence of a person in a predetermined detection area, a light source 2, and a sensor. 3 and a plate-like translucent panel 4 arranged between the illumination area.

  The light source 2 is formed of, for example, a straight tube fluorescent lamp, and is attached to the instrument body 1 using a lamp socket (not shown). The sensor 3 is a millimeter wave sensor using, for example, a 24 GHz millimeter wave, and is attached to the instrument body 1 by appropriate attachment means. The translucent panel 4 is made of, for example, a translucent acrylic resin, and is disposed on the front side (right side in FIG. 1) so as to cover the light source 2 and the sensor 3. That is, in the lighting fixture A of this embodiment, the right side of the translucent panel 4 is an illumination area in FIG.

  FIG. 3 is a schematic block diagram of the luminaire A. The control circuit 6 outputs a control signal corresponding to the detection result of the sensor 3 and the output power to the light source 2 according to the control signal output from the control circuit 6. And a lighting circuit 7 for controlling the lighting. While the person is detected by the sensor 3, the control circuit 6 outputs a lighting signal to the lighting circuit 7, and the lighting circuit 7 lights the light source 2 according to the lighting signal input from the control circuit 6. Conversely, when a person is no longer detected by the sensor 3, the control circuit 6 outputs a turn-off signal to the lighting circuit 7, and the lighting circuit 7 turns off the light source 2 according to the turn-off signal input from the control circuit 6. Here, the control circuit 6 and the lighting circuit 7 are accommodated in the instrument main body 1 shown in FIG. 1, and are electrically connected to the light source 2 or the sensor 3 by electric wires (not shown).

  By the way, even if it is the radio wave type sensor 3 as mentioned above, it receives the influence of the said translucent panel 4 by the material and thickness of the translucent panel 4, the distance with the translucent panel 4, etc., and detection sensitivity falls. There are things to do. Therefore, in the present embodiment, the translucent panel 4 is provided with a translucent member 5 that adjusts the thickness dimension of the translucent panel 4 in order to suppress a decrease in detection sensitivity.

  The translucent member 5 is made of, for example, the same acrylic resin as that of the translucent panel 4, and is provided in a portion facing the sensor 3 in the translucent panel 4 as shown in FIGS. The translucent member 5 is formed in a substantially mortar shape with the center axis P1 of the sensor 3 as the center, and is set so that the thickness dimension (the amount of protrusion to the sensor 3 side) increases as the distance from the center axis P1 increases. ing.

Here, the thickness dimension of the translucent panel 4 including the thickness dimension of the translucent member 5 is d, the wavelength of the electromagnetic wave transmitted from the sensor 3 is λ, and the relative permittivity of the translucent panel 4 and the translucent member 5 is ε. _r , where the incident angle of the electromagnetic wave to the translucent panel 4 is φ and the radome order is N,

The thickness dimension of the translucent member 5 is set in accordance with the incident angle φ. And by setting the thickness dimension of the translucent member 5 according to the above-mentioned formula 1, the amount of electromagnetic waves reflected by the translucent panel 4 can be reduced. As a result, the electromagnetic waves transmitted through the translucent panel 4 The amount can be increased, and a decrease in detection sensitivity of the sensor 3 can be suppressed.

Next, a specific description will be given with reference to FIG. The translucent panel 4 is optimized for electromagnetic waves incident from the front direction of the sensor 3 (that is, incident angle φ = 0 °), and the thickness dimension thereof is t1. When the thickness dimension of the translucent member 5 is t2 (φ) according to the incident angle φ of the electromagnetic wave, the thickness dimension d (φ) of the translucent panel 4 including the thickness dimension of the translucent member 5 is
d (φ) = t1 + t2 (φ) (2 formulas)
It becomes. And by setting the thickness dimension t2 (φ) of the translucent member 5 in accordance with the above formulas 1 and 2, the translucent panel 4 is optimally capable of reducing the amount of electromagnetic waves reflected by the translucent panel 4 Thickness.

In this embodiment, since a millimeter wave sensor using a 24 GHz millimeter wave is used, the wavelength of the electromagnetic wave is λ = 300 / (24 × 10 ³ ) × 10 ³ = 12.5 (mm). Further, the relative permittivity ε _r = 3.0 of the translucent panel 4 and translucent member 5 made of acrylic resin, and the thickness dimension t1 of the translucent panel 4 is adjusted to the incident angle φ = 0 ° by t1 = It shall be 3.58 (mm). When the distance L1 between the sensor 3 and the translucent panel 4 is set to 15 (mm), the thickness dimension t2 (φ) of the translucent member 5 is a value shown in Table 1 according to the incident angle φ. Set to In addition, the thickness dimension d in Table 1 is obtained according to the above-mentioned formula 1, and a value obtained by subtracting the thickness dimension t1 of the translucent panel 4 from the thickness dimension d is the thickness dimension t2 of the translucent member 5. L2 in Table 1 is a distance from the central axis P1 of the sensor 3 (a distance according to the incident angle φ) (see FIG. 2), and in this example, the radome order N = 1.

  In addition, although the translucent panel 4 and the translucent member 5 are provided separately in this embodiment, you may shape | mold both together. When provided separately, the detection sensitivity of the sensor 3 may vary depending on the positional accuracy of both, but when molded integrally, the variation in detection sensitivity due to the positional accuracy can be suppressed, There is also an advantage that the work of assembling the translucent member 5 to the translucent panel 4 becomes unnecessary.

  In this embodiment, a fluorescent lamp is used as the light source. However, for example, an incandescent lamp or an LED may be used. Further, the sensor 3 is not limited to the millimeter wave sensor, and any other sensor may be used as long as it is a radio wave type sensor. Further, the material of the translucent panel 4 and the translucent member 5 is not limited to the acrylic resin, and other materials may be used as long as they have translucency. Furthermore, the material of the translucent panel 4 and the translucent member 5 may be the same or different from each other as in the present embodiment. In the present embodiment, the light source 2 is turned off when no person is detected by the sensor 3, but the light source 2 may be dimmed and turned on at a predetermined dimming level.

  Note that when a plurality of the above-described lighting fixtures A are used, it is possible to provide an illumination system in which a decrease in detection sensitivity of the radio wave sensor 3 is suppressed.

2 Light source 3 Sensor 4 Translucent panel 5 Translucent member 7 Lighting circuit A Lighting fixture

Claims (3)

A light source, a radio wave sensor for detecting presence or absence of a person in a predetermined detection area, a lighting circuit for controlling output power to the light source based on a detection result of the sensor, the light source, the sensor, and an illumination area A translucent panel disposed between and a translucent member provided in a portion facing the sensor in the translucent panel and adjusting a thickness dimension of the translucent panel;
The thickness dimension of the translucent panel including the thickness dimension of the translucent member is d, the wavelength of the electromagnetic wave transmitted from the sensor is λ, the relative permittivity of the translucent panel and the translucent member is ε _r , When the incident angle of the electromagnetic wave to the translucent panel is φ and the radome order is N,

The thickness of the translucent member is set according to the incident angle so as to satisfy the above.   The lighting device according to claim 1, wherein the translucent member is made of the same material as the translucent panel and is formed integrally with the translucent panel.   A lighting system comprising a plurality of lighting fixtures according to claim 1 or 2.

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