JP6840188B2 - lighting equipment - Google Patents

Description

The present invention relates to a luminaire having a wireless communication function.

In conventional lighting equipment, circuit parts such as a power supply unit are arranged behind the light source unit in a state of being covered with a housing.

On the other hand, in the case of wirelessly controlling a lighting fixture, various methods have been proposed in order to maintain a good communication state (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2006-80007

By the way, when wirelessly controlling an embedded lighting fixture, it is desirable that the antenna used for wireless control is covered with a housing from the viewpoint of aesthetics or protection of the antenna, but generally, the housing covering the circuit parts is made of metal. In such a case, it is an issue to secure the transmission performance or the reception performance of the antenna.

An object of the present invention is to obtain a lighting fixture capable of ensuring transmission performance or reception performance of wireless communication even if the wireless communication unit having an antenna is covered with a metal housing or the like.

In order to achieve the above object, in the lighting equipment according to the present invention, a cable is connected to a light emitting unit, an antenna for transmitting and receiving a wireless signal, and a communication unit having a connector to which the cable is connected, and the cable is connected in response to the wireless signal. It includes a power supply unit that controls the light emission of the light emitting unit, and a plate-shaped base on which the light emitting unit, the communication unit, and the power supply unit are attached. The light emitting unit is provided on one surface of the base, and the power supply unit is provided. , The communication unit is provided on the other side surface of the base, and the antenna is provided on the other side surface of the base and is provided at a position overlapping the opening provided in the base. It is electromagnetically exposed to the side of the light emitting unit on one side , and the connector is connected to the power supply unit on the other side of the base by a cable.

According to the lighting equipment according to the present invention, the resonance of the cable connecting the communication unit and the power supply unit is suppressed, so that the transmission performance or the reception performance of wireless communication can be ensured.

It is a perspective view which shows an example of the appearance of the luminaire which concerns on Embodiment 1 of this invention. It is sectional drawing in the longitudinal direction of the luminaire which concerns on Embodiment 1 of this invention. It is a layout drawing of the wireless module board which concerns on Embodiment 1 of this invention. It is a top view of the luminaire according to the first embodiment of the present invention. It is a table which shows the measurement result of the length of a long side of a through hole portion and radiation efficiency. It is a figure of the through hole part seen from the lower side of the luminaire according to Embodiment 1 of this invention. It is sectional drawing in the short side direction when a cover is attached to the luminaire which concerns on Embodiment 1 of this invention. It is a perspective view which shows an example of the appearance of the luminaire which concerns on Embodiment 2 of this invention. FIG. 5 is a plan view of the inside of the power supply unit according to the second embodiment of the present invention as viewed from above.

Embodiment 1.
FIG. 1 is a perspective view showing an example of a lighting fixture according to the first embodiment of the present invention. This lighting fixture 1 is an example of a lighting fixture installed on the ceiling, in which the power supply unit 3 is arranged on the upper surface of the base 2 of the metal plate, and the LED substrate 4 which is a light emitting unit is arranged on the lower surface of the base 2. A wireless communication unit 5 for receiving a wireless signal for controlling the light emitting unit is arranged on the upper surface of the base 2.

The power supply unit 3 and the wireless communication unit 5 are connected by a power supply line (not shown) and a control signal line (not shown). Here, the length of the cable of the power supply line and the control communication line is the wavelength of the radio wave of the radio signal to be communicated in order to prevent the cable from resonating with the radio wave of the radio signal to be communicated by the wireless communication unit 5. It is desirable that it is less than half.

Further, the power supply unit 3 and the wireless communication unit 5 are arranged so as to be electrically insulated from the base 2 of the metal plate. The power supply unit 3 may or may not be covered with a metal material.

FIG. 2 is a cross-sectional view of the luminaire 1 in the longitudinal direction. The power supply unit 3 and the wireless communication unit 5 are arranged on the upper surface of the base 2, and the LED substrate 4 is arranged on the lower surface. The LED element 6 which is a light source is arranged on the lower surface of the LED substrate 4. The LED board 4 and the power supply unit 3 are connected by wiring (not shown).

FIG. 3 is a layout diagram of a wireless module substrate which is a wireless communication unit 5 used in the lighting fixture 1 according to the first embodiment of the present invention. The wireless communication unit 5 includes a wireless module board 7, an antenna 8 for transmitting and receiving wireless signals, a shield case 9 that shields a circuit that performs wireless processing, and a connector 10 for connecting the power supply unit 3 to a power supply line and a control signal line. ..

As the antenna 8, a pattern antenna generated by a pattern on a substrate or a chip antenna is used.

FIG. 4 is a plan view of the lighting fixture 1 according to the first embodiment of the present invention as viewed from above when the lighting fixture 1 is installed on the ceiling. The wireless communication unit 5 is installed so that the surface on which the antenna 8 is arranged faces downward, and the base 2 on which the antenna 8 of the wireless communication unit 5 overlaps is provided with a slit-shaped through hole portion 11. ing.

The through-hole portion 11 has an elongated opening substantially parallel to the longitudinal direction of the antenna 8. When the through-hole portion 11 is rectangular, the length of the long side is the wavelength of the radio wave of the radio signal communicated by the wireless communication unit. It is more than a quarter of the length and is open. For example, when the frequency of the radio wave of the radio signal is 920 MHz, the through hole portion 11 is provided with a length of about 82 mm.

FIG. 5 shows the radio wave of the radio signal when the through hole is rectangular and the length of the long side is changed at the radio wave frequencies of the three types of radio signals (922.4 MHz, 925.6 MHz, 928.0 MHz). It is a table which showed the result of having measured the radiation efficiency.

When the frequency is 922.4 MHz, the radiation efficiency is -13.1 dB when there is no through hole (0 cm), whereas the radiation efficiency is improved to -6.2 dB at 5 cm, which is the wavelength of the radio wave of the radio signal. It is shown that the radiation efficiency is greatly improved at 7.5 cm or more, which is close to a quarter of the length, at -1.3 dB or more. The same applies to other frequencies.
Therefore, the length of the through-hole portion 11 may be 5 cm or more, preferably 7.5 cm or more (one-fourth or more of the wavelength of the radio wave).

In the present embodiment, the through hole portion 11 is shown as an example of being rectangular, but it does not have to be rectangular, and may have a shape with rounded corners or a rectangular short side having an arc shape. The hole portion 11 may be an elongated through hole.

When the through hole portion 11 overlaps with a ground line (not shown) printed on the LED substrate 4, the radio wave of the radio signal is greatly attenuated. Therefore, the opening is provided at a position that does not overlap with the ground line (not shown) printed on the LED substrate 4 so that the radio wave of the radio signal is not significantly attenuated.

FIG. 6 shows an enlarged view of the through hole portion 11 seen from below when the luminaire 1 is installed on the ceiling. Since the wireless module board 7 is installed so that the arranged antenna 8 overlaps the through hole portion 11 substantially in parallel, the antenna 8 is seen from the through hole portion 11.

Regarding the distance from the center of the antenna 8 to the center of the through hole portion 11, the radio wave of the radio signal is radiated by the through hole portion 11, but the radio wave of the radio signal is attenuated as the distance increases, so that the radio wave is wireless. A distance of 1/4 or less of the radio wave wavelength of the signal is desirable.

Next, the operation of the luminaire according to the first embodiment of the present invention will be described.

When operated by the wireless remote controller from below the luminaire 1 installed on the ceiling, a wireless signal for controlling the luminaire 1 is transmitted from the wireless remote controller.

The radio wave of the radio signal is blocked by the base 2 of the metal plate, but the radio wave is radiated from the through hole portion 11 opened in a slit shape and reaches the antenna 8, and the antenna 8 receives the radio signal from the wireless remote controller.

The wireless communication unit 5 that has received the wireless signal by the antenna 8 takes out the control signal for controlling the luminaire 1 by processing the wireless signal and sends it to the power supply unit 3 connected to the control signal line.

The power supply unit 3 turns on, off, and dims the LED element 6, which is a light source, according to the received control signal.

As described above, according to the lighting equipment provided with the slit-shaped through hole 11 in the antenna 8 of the wireless communication unit 5 overlapping the base 2 of the metal plate, the radio wave of the wireless signal transmitted from the wireless remote control is Since the radio wave is radiated through the through hole 11 and reaches the antenna 8, the antenna 8 can satisfactorily receive the wireless signal from the wireless remote control.

Further, since the through-hole portion 11 is located substantially parallel to the antenna 8 and has a length of one-fourth or more of the wavelength of the radio wave of the radio signal, an elongated radio wave is emitted along the through-hole portion 11 due to the antenna effect. Since it reaches the antenna 8 well, the antenna 8 can better receive the radio signal from the wireless remote control.

FIG. 7 shows a cross-sectional view in the lateral direction when the cover 12 is attached to the luminaire. The cover 12 is integrally molded with a transparent or translucent resin containing a light diffusing material such as polycarbonate or acrylic.

The cover 12 has a claw portion 12a, and the claw portion 12a is elastically deformed and expanded to engage with the side plate 2a of the base 2. Further, the cover 12 has a base contact portion 12b, the base contact portion 12b is in contact with the surface of the base 2 on which the LED substrate 4 is installed, and the cover 12 is fixed to the base 2. LED.

At this time, the through hole portion 11 when the cover 12 having the base contact portion 12b is attached is provided so as to be located above the base contact portion 12b. For example, the through hole portion 11 is provided at a position close to the long side of the base 2 at a position less than a quarter of the length of the short side of the center of the base 2 in the lateral direction.

By making the base contact portion 12b a highly reflective material having a higher reflectance than the main body portion of the cover 12, the through hole portion 11 is thus positioned above the base contact portion 12b of the cover 12. By providing such a method, it is possible to prevent the light emitted from the light emitting portion from leaking from the through hole portion 11 to the upper portion.

Further, in lighting construction that does not use wireless communication, even if the wireless communication unit 5 is not arranged, the through hole portion 11 is closed by the base contact portion 12b, so that dust and insects are prevented from entering the cover 12. be able to.

Although the case where the luminaire is rectangular is shown here, it is not limited to the rectangular shape, and in the case of a circular shape, the through hole portion 11 may be provided at a position closer to the circumference than the center of the circle.

Embodiment 2.
FIG. 8 is a perspective view showing an example of the lighting equipment according to the second embodiment of the present invention. This luminaire is an example of a luminaire that is embedded and installed in the ceiling.
In the figure, the same or corresponding parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

Reference numeral 20 denotes the main body of the luminaire, which has the shape of a box body that opens downward. Reference numeral 21 denotes a non-metal box-shaped light emitting unit, in which an LED substrate or the like is arranged, and the lower surface thereof is a cover through which the light of the LED of the light source is transmitted. The light emitting unit 21 is fitted into the opening of the main body 20 from below and installed. Reference numeral 22 denotes a power supply unit having a box body made of a metal plate, in which a power supply unit and a wireless communication unit are arranged.

FIG. 9 is a plan view showing the arrangement of the power supply unit and the wireless communication unit when the inside of the power supply unit 22 is viewed from above. A power supply unit 3 and a wireless communication unit 5 are arranged on the bottom surface of a power supply unit 22 of a box formed of a metal plate.

The wireless communication unit 5 is installed so that the surface on which the antenna 8 is arranged faces downward, and a slit-shaped through hole portion 11 is provided on the bottom surface of the power supply unit 22 on which the antenna 8 of the wireless communication unit 5 overlaps. It is provided. The positional relationship between the through-hole portion 11 and the antenna 8 when the power supply unit 22 is viewed from below is the same as in FIG.

Since the wireless remote controller for operating the lighting is located on the floor side, the through hole portion 11 is provided on the lower surface which is the surface on the floor side.

The operation of the luminaire according to the second embodiment of the present invention is the same as that of the first embodiment, and is therefore omitted.

As described above, also in the lighting fixture 1 according to the second embodiment of the present invention, the radio wave of the wireless signal transmitted from the wireless remote controller is radiated by the through hole portion 11 provided in the metal plate of the box body of the power supply unit 22. Since it reaches the antenna 8, the antenna 8 can satisfactorily receive the radio signal from the wireless remote controller.

In the above embodiment 2, the power supply unit 3 and the wireless communication unit 5 are arranged in the same metal plate box, but the power supply unit 3 and the wireless communication unit 5 are placed in different metal plate boxes. It may be configured to be arranged.

Further, in the above-described first and second embodiments, the through-hole portion 11 shows the case where there is one through-hole, but the through-hole portion 11 may be a plurality of through-holes. When there are a plurality of through holes, it is desirable that they are arranged parallel to the longitudinal direction of the through holes. Since there are a plurality of through holes, the range in which the antenna is aligned with the through holes is widened, and positioning becomes easy when the wireless communication unit 5 is arranged.

Further, in the above-described first and second embodiments, the case where the lighting fixture 1 is installed on the ceiling has been described, but the lighting fixture may be installed on a wall, a pillar, or the like.
In this case, by providing the through hole portion 11 on the surface of the metal plate in the direction in which the wireless remote controller is operated from the antenna 8, the antenna 8 can satisfactorily receive the wireless signal from the wireless remote controller.

The present invention is not limited to these embodiments or modifications thereof. As long as the gist of the present invention is not deviated, various modifications that can be conceived by those skilled in the art are applied to the present embodiment or the modified examples thereof, or a mode constructed by combining components in different embodiments or the modified examples is also the present invention. Is included in the range of.

1 Lighting equipment 2 Base 2a Side plate 3 Power supply 4 LED board 5 Wireless communication part 6 LED element 7 Wireless module board 8 Antenna 9 Shield case 10 Connector 11 Through hole 12 Cover 12a Claw 12b Base contact part 20 Main body 21 Light emitting unit 22 Power supply unit

Claims (2)

Light emitting part and
A communication unit that has an antenna for transmitting and receiving wireless signals and a connector to which a cable is connected,
A power supply unit to which the cable is connected and controlling the light emission of the light emitting unit in response to the wireless signal,
A plate-shaped base to which the light emitting unit, the communication unit, and the power supply unit are attached,
With
The light emitting portion is provided on one surface of the base.
The power supply unit is provided on the other side surface of the base.
The communication unit is the light emitting unit on one side of the base by providing the antenna on the other side surface of the base and at a position overlapping the opening provided in the base. A luminaire that is electromagnetically exposed to the side of the luminaire and the connector is connected to the power supply unit by the cable on the other side of the base. The luminaire according to claim 1, wherein the length of the cable is halved or less of the wavelength of the radio signal.

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