JP2024060061A - Light source unit and lighting fixture - Google Patents

Abstract

[Problem] To improve the reception sensitivity of a wireless signal while equalizing the light distribution characteristics. [Solution] A light source unit B1 includes a light source module, a power supply device, a mounting plate 3, and a communication device 4. The mounting plate 3 has a light source module attached to its front surface and a power supply device attached to its back surface. The communication device 4 has a receiver 40 that receives a wireless signal using infrared light as a medium, and a case 43 that houses the receiver 40. The mounting plate 3 has a through hole 32 that penetrates from the front surface to the back surface and allows a wireless signal to pass through. The through hole 32 is provided at a position that does not overlap with the light source module 1 when viewed from the thickness direction of the mounting plate 3. The case 43 has an opening 44 that faces the through hole 32 of the mounting plate 3, and a peripheral wall 45 that is formed in a cylindrical shape to surround the opening 44 and protrudes toward the through hole 32. The peripheral wall 45 is formed so that its tip contacts the periphery of the through hole 32 in the mounting plate 3. [Selected Figure] Figure 5

Description

The present disclosure relates to a light source unit and a lighting fixture, and more specifically to a light source unit that receives a wireless signal and operates in response to the wireless signal, and a lighting fixture having the light source unit.

As an example of a conventional light source unit, the light source unit described in Patent Document 1 is given. The light source unit described in Patent Document 1 (hereinafter referred to as the conventional example) includes a receiver having a light receiving surface for receiving a signal from a remote controller, a light source module, a power supply device for turning on the light source module, an attachment plate, and a translucent cover.

The light source module is configured by mounting multiple light emitting elements (e.g., LEDs) on one surface of a rectangular substrate. The light source module is attached to a first mounting surface of the mounting plate. The power supply device and the light receiver are attached to a second mounting surface of the mounting plate, which is the surface opposite the first mounting surface. The translucent cover is attached to the mounting plate so as to cover the first mounting surface.

The mounting plate has an opening window formed therein. The opening window penetrates from the first mounting surface to the second mounting surface of the mounting plate. An opening hole is formed in the substrate. The light receiving surface of the receiver faces the translucent cover through the opening window in the mounting plate and the opening hole in the substrate.

JP 2016-152120 A

However, in the conventional example, the opening hole formed in the substrate is formed between the light-emitting elements mounted on the substrate. Therefore, the distance between two adjacent light-emitting elements on either side of the opening hole is restricted by the size of the opening hole. Furthermore, if the opening hole is made smaller, the sensitivity of the receiver to receiving infrared signals (radio signals) may decrease.

Therefore, in the conventional configuration, it may be difficult to uniformly space multiple light-emitting elements to achieve uniform light distribution characteristics while suppressing a decrease in the reception sensitivity of infrared signals (wireless signals).

The objective of this disclosure is to provide a light source unit and lighting fixture that can improve the reception sensitivity of wireless signals while achieving uniform light distribution characteristics.

A light source unit according to one aspect of the present disclosure includes a light source module having a plurality of light-emitting elements and a substrate on which the plurality of light-emitting elements are mounted, and a power supply device that supplies a current to the plurality of light-emitting elements to cause them to emit light. The light source unit includes a mounting plate on which the light source module is attached on the front surface and the power supply device is attached on the back surface, and a communication device that receives a wireless signal and transmits control information contained in the wireless signal to the power supply device. The power supply device is configured to adjust the supply of the current according to the control information. The mounting plate has a through hole that penetrates from the front surface to the back surface and allows the wireless signal to pass through. The through hole is provided at a position that does not overlap with the light source module when viewed from the thickness direction of the mounting plate. The communication device includes a receiving unit that receives the wireless signal using infrared rays as a medium, and a case that houses the receiving unit. The case has an opening that faces the receiving unit to the through hole along the thickness direction of the mounting plate, and a peripheral wall that is formed in a cylindrical shape so as to surround the opening and protrudes toward the through hole. The peripheral wall is formed so that its tip contacts the periphery of the through hole in the mounting plate.

A lighting fixture according to one aspect of the present disclosure includes a light source unit and a fixture body that supports the light source unit.

The light source unit and lighting fixture disclosed herein have the advantage of being able to improve the reception sensitivity of wireless signals while achieving uniform light distribution characteristics.

FIG. 1 is a perspective view of a lighting fixture according to a first embodiment of the present disclosure. FIG. 2 is an exploded perspective view of the above lighting fixture and the light source unit according to the first embodiment of the present disclosure. FIG. 3 is a circuit block diagram of the light source unit of the above embodiment. FIG. 4 is a perspective view of a communication device in the light source unit. FIG. 5 is a partial cross-sectional view of the light source unit. FIG. 6 is a cross-sectional view of the light source unit of the above, with a portion thereof omitted. FIG. 7 is a front view of a main part of the light source unit. FIG. 8 is an explanatory diagram for explaining an installation state of the lighting fixture of the above embodiment. FIG. 9 is a cross-sectional view of a light source unit according to the second embodiment of the present disclosure with a portion thereof omitted.

The light source unit and lighting device according to the embodiments of the present disclosure will be described in detail below with reference to the drawings. However, each figure described in the following embodiments is a schematic diagram, and the ratio of the size and thickness of each component does not necessarily reflect the actual dimensional ratio. Note that the configuration described in the following embodiments is merely one example of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.

(1) Embodiment 1
(1-1) Lighting fixture A1 according to embodiment 1 of the present disclosure (hereinafter, abbreviated as lighting fixture A1) includes a light source unit B1 according to embodiment 1 of the present disclosure (hereinafter, abbreviated as light source unit B1) and a fixture body 6, as shown in Figures 1 and 2. The light source unit B1 is detachably attached to the fixture body 6 that is directly attached to a ceiling. However, the fixture body 6 may be embedded in the ceiling, or may be directly attached to a wall or embedded in the wall.

The fixture body 6 includes a rectangular box-shaped storage section 60 with an open bottom, a pair of reflectors 61 protruding obliquely upward from the opening edges on both sides along the longitudinal direction of the storage section 60, and a pair of end plates 62 provided at both ends in the longitudinal direction of the storage section 60 and the pair of reflectors 61 (see FIG. 2). The fixture body 6 is installed on the ceiling by inserting a hanging bolt (not shown) into at least two of the multiple mounting holes 63 provided on the bottom surface of the storage section 60 and tightening nuts (not shown) on the hanging bolts. In addition, a power line is inserted into one of the multiple power supply holes 64 provided on the bottom surface of the storage section 60. The power line inserted into the power supply hole 64 is electrically connected to a terminal block 65 attached to the inner bottom surface of the storage section 60. Three electric wires 66 are drawn out from the terminal block 65. The tips of these three electric wires 66 are electrically connected to one male power connector 67.

(1-2) Light Source Unit As shown in FIG. 2, the light source unit B1 includes a light source module 1, a power supply device 2, a mounting plate 3, a communication device 4, and a cover 5.

(1-2-1) Light Source Module The light source module 1 has a number of LEDs (Light Emitting Diodes) 10 and a substrate 11. The LEDs 10, which are light-emitting elements, are, for example, packaged white LEDs for lighting. However, the light-emitting elements are not limited to LEDs, and may be organic electroluminescence elements, semiconductor laser elements, or the like.

The substrate 11 is formed in a long rectangular shape. However, the substrate 11 may be formed by connecting multiple substrates in the longitudinal direction. The multiple LEDs 10 are mounted in a single row at equal intervals along the longitudinal direction of the substrate 11, at the center of the short side of the surface (underside) of the substrate 11 (see FIG. 2). The multiple LEDs 10 are electrically connected in series or series-parallel by printed wiring formed on the surface of the substrate 11.

(1-2-2) Mounting Plate The mounting plate 3 is formed into a long rectangular gutter shape from a metal plate. The mounting plate 3 has a long rectangular bottom plate 30 and a pair of side plates 31 rising upward from both ends along the longitudinal direction of the bottom plate 30. The light source module 1 is attached to the surface (lower surface) of the bottom plate 30 by a plurality of claws (not shown) cut and raised from the bottom plate 30. The width of the bottom plate 30 in the short side direction is larger than the width of the substrate 11 in the short side direction (see FIG. 2).

The bottom plate 30 also has a circular through hole 32 (see FIG. 2). This through hole 32 is provided in a portion of the bottom plate 30 that is outside the light source module 1 (a position adjacent to the substrate 11 along the short side direction of the substrate 11). In other words, the through hole 32 is provided in a position that does not overlap with the light source module 1 when viewed from the thickness direction of the bottom plate 30.

(1-2-3) Cover The cover 5 is formed in a semi-cylindrical shape from a translucent synthetic resin such as acrylic resin or polycarbonate resin. The cover 5 also has a pair of protruding walls 50 that protrude upward along the longitudinal direction. The cover 5 accommodates the mounting plate 3 between the pair of protruding walls 50, and is attached to the mounting plate 3 by hooking the hook portions formed on the tips (upper ends) of the pair of protruding walls 50 onto the tips (upper ends) of the pair of side plates 31 of the mounting plate 3.

2, the power supply unit 2 has a lighting circuit 20 and a power supply case 21 that houses the lighting circuit 20. The lighting circuit 20 is composed of a printed circuit on which various electronic components including integrated circuits and a female power connector 23 are mounted on a rectangular printed circuit board 22. The power connector 23 is electrically and mechanically connected to the power connector 67.

The power supply case 21 is made of a metal plate and is formed into a long rectangular box shape with one side (bottom) open. The power supply case 21 houses the lighting circuit 20 and is fixed to the mounting plate 3 with the open side facing the back side (top) of the bottom plate 30. The power supply case 21 is electrically connected to the mounting plate 3 when it is fixed to the mounting plate 3. Furthermore, the mounting plate 3 is electrically connected to the fixture body 6 when the light source unit B1 is attached to the fixture body 6. Therefore, the power supply case 21 of the power supply device 2 is electrically connected to the fixture body 6 through the mounting plate 3.

As shown in FIG. 3, the lighting circuit 20 is supplied with AC power from the commercial power system 9 through the power connector 23. The lighting circuit 20 has a power conversion circuit 200, a constant current circuit 201, a control circuit 202, a control power supply circuit 203, a pair of output terminals 204, 205, a signal terminal 206, a control power supply terminal 207, and a ground terminal 208. One output terminal 204 is electrically connected to the positive electrode of the light source module 1, and the other output terminal 205 is electrically connected to the negative electrode of the light source module 1.

The power conversion circuit 200 is configured to convert AC power supplied from the power system 9 into DC power. The power conversion circuit 200 preferably has, for example, a full-wave rectifier circuit, a power factor correction circuit (step-up chopper circuit), a buck converter (step-down chopper circuit), etc. Alternatively, the power conversion circuit 200 may be configured with a full-wave rectifier circuit and a converter circuit. The converter circuit has a single-stage converter (also called a one-converter) capable of performing voltage conversion and power factor correction in parallel. Specifically, the converter circuit preferably has a SEPIC (Single Ended Primary Inductance Converter) type DC/DC converter circuit.

The constant current circuit 201 is configured to match the DC current supplied from the power conversion circuit 200 to the light source module 1 via a pair of output terminals 204, 205 to a target value.

The control circuit 202 has a microcontroller as its main component. The control circuit 202 is configured to switch between operating and stopping the power conversion circuit 200 and the constant current circuit 201, and to change the target value of the direct current (load current) in the constant current circuit 201, in response to control information received from the communication device 4.

The control circuit 202 receives a PWM (Pulse Width Modulation) signal from the communication device 4 through the signal terminal 206 and the ground terminal 208. The PWM signal transmits control information by changing the duty ratio of a rectangular wave signal with a constant period. For example, control information is transmitted that sets the target value of the load current to zero when the duty ratio is between 95% and 100%. Also, control information is transmitted that sets the target value of the load current to the rated current value of the light source module 1 when the duty ratio is 5% or less. Furthermore, control information is transmitted that sets the target value of the load current to a corresponding value in the range of 5% to 100% of the rated current value of the light source module 1 when the duty ratio is any value in the range of 95% to 5%.

The control power supply circuit 203 is configured to generate a control power supply voltage from the DC output of the power conversion circuit 200. The control power supply circuit 203 is configured to create a control power supply voltage (e.g., a DC voltage of about 5 V to 3.3 V) from the output voltage of the power conversion circuit 200. The control power supply circuit 203 applies the created control power supply voltage to the control power supply terminal 207 and the ground terminal 208, and supplies it to the communication device 4 via the two electric wires 46.

(1-2-5) Communication Device (1-2-5-1) Circuit Configuration of Communication Device The communication device 4 has a receiving section 40 and a signal circuit section 41, and is configured to receive a wireless signal (infrared signal) transmitted from the remote controller 7 (see FIG. 2) and acquire control information. The infrared signal transmitted from the remote controller 7 complies with a standard defined by the Association for Electric Home Appliances, so-called the KAKK format, for example. In the KAKK format, the infrared ray has a peak wavelength of 900 to 950 nm, and a carrier wave consisting of a square wave with a duty ratio of 50% and a frequency of 33 kHz or more and 40 kHz or less is pulse position modulated.

The receiving unit 40 has two light receiving elements (e.g., photodiodes or phototransistors) for receiving infrared rays (infrared light). The receiving unit 40 is configured to shape the waveform of the output signal of each light receiving element, amplify it, and output it. In other words, the receiving unit 40 has the function of converting a radio signal (infrared signal) into an electrical signal and outputting it. In the following description, the electrical signal output from the receiving unit 40 is referred to as a received signal.

The signal circuit unit 41 demodulates the received signal output by the receiver unit 40 to obtain control information. The control information includes each command, such as a turn-on command to turn on the light source unit B1, a turn-off command to turn off the light source unit B1, and a dimming command to indicate the dimming ratio of the light source unit B1.

Furthermore, the signal circuit unit 41 converts the acquired control information (on command, off command, and dimming command) into a PWM signal. For example, when the signal circuit unit 41 acquires a turn-on command, it converts it into a PWM signal with a duty ratio of 3%, and when it acquires a turn-off command, it converts it into a PWM signal with a duty ratio of 100%. When the signal circuit unit 41 acquires a dimming command, it converts it into a PWM signal with a duty ratio corresponding to the dimming ratio instructed by the dimming command. The signal circuit unit 41 outputs the converted PWM signal to the signal terminal 206 and ground terminal 208 of the lighting circuit 20. The receiver 40 and the signal circuit unit 41 operate on the control power supply voltage supplied from the control power supply circuit 203 of the lighting circuit 20.

(1-2-5-2) Structure of the Communication Device As shown in Fig. 4, the communication device 4 has a circuit board 42 and a case 43. The circuit board 42 is formed in a rectangular shape. A receiving unit 40, a signal circuit unit 41, a signal connector 47, etc. are mounted on the surface of the circuit board 42. However, the signal circuit unit 41 is not shown in Fig. 4.

The receiving unit 40 has two light receiving lenses 401 on one side of a rectangular parallelepiped package 400 (see Figs. 4 and 5). Each light receiving lens 401 is configured to focus an infrared signal (infrared light) on a light receiving element such as a photodiode or phototransistor housed in the package 400. The receiving unit 40 is mounted near one corner of the surface of the circuit board 42 so that the side of the package 400 on which the light receiving lens 401 is provided is perpendicular to the surface of the circuit board 42. However, the number of light receiving lenses 401 that the receiving unit 40 has is not limited to two, and may be three or more or just one. In addition, when the circuit board 42 is housed in the case 43 with the surface of the circuit board 42 facing the bottom wall 430 of the case 43, the receiving unit 40 is mounted so that the side of the package 400 on which the light receiving lens 401 is provided is parallel to the surface of the circuit board 42.

The signal connector 47 is mounted on the surface of the circuit board 42 at a diagonal position to the receiver 40. The ends of three electric wires 46, a wire for a control signal, a wire for a control power supply, and a wire for ground, are electrically connected to the signal connector 47 (see FIG. 4).

(1-2-5-3) Case The up/down, left/right, front/rear directions indicated by arrows in FIG.

As shown in FIG. 4, the case 43 has a lower wall 430, a front wall 431, a rear wall 432, a side wall 433, and an upper wall 434, and is formed in a box shape with an open left side. However, the upper part of the front wall 431 of the case 43 is inclined upward toward the rear wall 432 (see FIG. 4). The case 43 also has a pair of support pieces 435 that sandwich and support both ends along the longitudinal direction of the circuit board 42 between the rear wall 432. The pair of support pieces 435 are formed integrally with the lower wall 430 and the upper wall 434 so that one protrudes from each of the lower wall 430 and the upper wall 434. The case 43 is preferably configured as a synthetic resin molded body made of a synthetic resin material such as polycarbonate resin.

A circular opening 44 is formed at the rear end of the right end of the lower wall 430. The opening 44 penetrates the lower wall 430 in the vertical direction and faces the two light receiving lenses 401 of the receiver 40 mounted on the circuit board 42 along the vertical direction (see Figures 4 and 5). A peripheral wall 45 is formed at the rear end of the right end on the lower surface of the lower wall 430. The peripheral wall 45 is formed in a cylindrical shape so as to surround the periphery of the opening 44. In other words, the two light receiving lenses 401 of the receiver 40 face the outside of the case 43 through the opening 44 of the lower wall 430 and the inside of the peripheral wall 45. Therefore, the receiver 40 can receive infrared signals arriving from outside the case 43 with the two light receiving lenses 401 through the inside of the peripheral wall 45 and the opening 44.

Here, the opening 44 of the case 43 faces the through hole 32 provided in the bottom plate 30 of the mounting plate 3 in the vertical direction (see FIG. 5). Therefore, by designing the opening 44 and the through hole 32 to be the optimal size, it is possible to ensure the communication distance required for the communication device 4 while reducing the possibility of receiving a wireless signal transmitted to another light source unit B1.

A wire passage groove 4300 is formed at the left end of the lower wall 430. Furthermore, an L-shaped retaining claw 4301 is formed near the wire passage groove 4300 on the underside of the lower wall 430 (see FIG. 4). The retaining claw 4301 retains three electric wires 46 that are pulled out of the case 43 from the wire passage groove 4300. Plug connectors are connected to the tips of these three electric wires 46.

The case 43 has a pair of connecting male parts 436. Each of the pair of connecting male parts 436 is formed in an E shape. The pair of connecting male parts 436 are mechanically connected to a pair of connecting female parts provided on the power supply case 21 (see FIG. 2). The pair of connecting female parts are provided on one side of the power supply case 21 in the longitudinal direction.

Thus, the case 43 is arranged adjacent to the power supply case 21 along the longitudinal direction of the power supply case 21 by connecting a pair of male connecting portions 436 to a pair of female connecting portions (see FIG. 6). The three electric wires 46 of the communication device 4 are electrically connected to the signal terminal 206, the control power terminal 207, and the ground terminal 208 of the lighting circuit 20 by connecting a plug connector to a receptacle connector mounted on the printed circuit board 22 of the power supply device 2 (see FIG. 3).

(1-3) Features of the Light Source Unit One feature of the light source unit B1 is that the mounting plate 3 has a through hole 32 that penetrates from the front to the back and allows a wireless signal to pass through, and the through hole 32 is provided at a position that does not overlap with the light source module 1 when viewed from the thickness direction of the mounting plate 3 (see FIG. 7). For example, if the through hole is provided at a position that overlaps with the light source module 1, a hole is provided in the substrate 11 at a position that overlaps with the through hole, so that the pitch of the LEDs 10 becomes partially large near the hole. As a result, there is a risk that the uniformity of the light distribution characteristic of the light source module will decrease.

In response to this, the light source unit B1 can reduce the possibility of erroneously receiving a wireless signal (infrared signal) transmitted to another light source unit (improving the reception sensitivity of the wireless signal) while achieving uniformity in the light distribution characteristics of the light source module 1.

In addition, the light source unit B1 has an opening 44 in the case 43 of the communication device 4, and the receiver 40 receives the wireless signal (infrared signal) through the opening 44. For example, if the light receiving lens 401 of the receiver 40 is placed outside the case 43, the reception range of the wireless signal becomes too wide, and there is a risk that a wireless signal transmitted to another light source unit will be received.

In response to this, the light source unit B1 can narrow the range in which the receiver 40 can receive the wireless signal (infrared signal) by having the receiver 40 receive the wireless signal (infrared signal) through the opening 44 of the case 43. As a result, the light source unit B1 can reduce the possibility of erroneously receiving a wireless signal (infrared signal) transmitted to another light source unit.

The opening 44 of the case 43 overlaps with the through hole 32 of the mounting plate 3 along the thickness direction of the bottom plate 30 (see Figures 5-7). Therefore, the wireless signal (infrared signal) emitted from the remote controller 7 passes from the through hole 32 of the mounting plate 3 through the opening 44 of the case 43 and is received by the receiver 40. For example, if the light receiving lens 401 of the receiver 40 is placed on the surface (underside) of the mounting plate 3 (bottom plate 30), the reception range of the wireless signal becomes too wide, and there is a risk that a wireless signal transmitted to another light source unit will be received.

In response to this, the light source unit B1 narrows the range in which the receiver 40 can receive the wireless signal (infrared signal) by having the receiver 40 receive the wireless signal (infrared signal) from the through hole 32 of the mounting plate 3 through the opening 44 of the case 43. As a result, the light source unit B1 can reduce the possibility of erroneously receiving a wireless signal (infrared signal) transmitted to another light source unit.

Furthermore, in the light source unit B1, the case 43 has a cylindrical peripheral wall 45. The peripheral wall 45 protrudes from the case 43 so as to surround the periphery of the opening 44 on the surface of the case 43 (see Figures 4 and 5). It is preferable that the tip (lower end) of the peripheral wall 45 contacts the back surface (upper surface) of the bottom plate 30 or is close enough not to contact (see Figure 5). If the peripheral wall 45 is not provided, the possibility that a radio signal (infrared signal) that passes through the through hole 32 of the bottom plate 30 will reach the opening 44 of the case 43 and be received by the receiver 40 decreases.

In contrast, in the light source unit B1, the peripheral wall 45 provided on the case 43 increases the likelihood that the wireless signal that passes through the through hole 32 in the bottom plate 30 will be reflected by the inner surface of the peripheral wall 45, reach the opening 44 in the case 43, and be received by the receiver 40.

Furthermore, the inner surface of the peripheral wall 45 is formed in a truncated cone shape with the inner diameter decreasing from the tip (lower end) of the peripheral wall 45 toward the opening 44 (see FIG. 5). Since the inner surface of the peripheral wall 45 of the light source unit B1 is formed in a truncated cone shape, most of the wireless signals (infrared signals) that enter the interior of the peripheral wall 45 through the through holes 32 can reach the opening 44 and be received by the receiver 40. In other words, the light source unit B1 can increase the reception sensitivity of necessary wireless signals while preventing the reception of unnecessary wireless signals.

Here, assume an illuminated space E1 in which multiple lighting fixtures A1 are installed at equal intervals on the ceiling (see Figure 8). This illuminated space E1 is, for example, one floor of an office building, and multiple lighting fixtures A1 (light source units B1) are installed so that they are spaced equally vertically and horizontally. Note that the vertical spacing (longitudinal direction of light source unit B1) between multiple lighting fixtures A1 is denoted as P1, and the horizontal spacing (shortitudinal direction of light source unit B1) is denoted as P2.

For example, when an operator H1 operates the remote controller 7 to turn on only one lighting fixture A1 directly above, it is desirable to reduce the possibility that the wireless signal transmitted from the remote controller 7 will be received by the adjacent lighting fixture A1. In other words, it is preferable that the range in which the receiver 40 of each light source unit B1 can receive a wireless signal is narrower than the sum of the longitudinal length of the light source unit B1 and twice the vertical spacing P1, and narrower than the sum of the lateral length of the light source unit B1 and twice the horizontal spacing P2. However, the reach of the wireless signal transmitted from the remote controller 7 is, for example, within an angle of 20 degrees from the tip of the remote controller 7 and a distance of 5 to 6 m from the tip of the remote controller 7.

The light source unit B1 can increase the reception sensitivity of necessary wireless signals while preventing the reception of unnecessary wireless signals by setting the size of the opening 44, the size of the through hole 32, and the size of the peripheral wall 45 (axial length and inner diameter) to appropriate values.

Another feature of the light source unit B1 is that the communication device 4 is located adjacent to the power supply device 2.

The smaller the difference between the frequency of the common mode noise flowing from the lighting circuit 20 of the power supply device 2 to the mounting plate 3 via the power supply case 21 and the carrier frequency (33 kHz to 40 kHz) of the wireless signal (infrared signal), the higher the possibility that the common mode noise will interfere with the wireless signal (received signal). And when the common mode noise interferes with the wireless signal (received signal), the possibility of the power supply device 2 malfunctioning or becoming inoperable increases.

In the light source unit B1, the communication device 4 is disposed adjacent to the power supply device 2, so the wire 46 electrically connecting the communication device 4 and the power supply device 2 can be shortened. In other words, the light source unit B1 can reduce the possibility of interference between the received signal and common mode noise by shortening the wire 46 electrically connecting the communication device 4 and the power supply device 2. As a result, the light source unit B1 can improve the noise resistance (S/N ratio) of wireless signals.

In addition, since the case 43 of the communication device 4 is attached to the power supply case 21 of the power supply device 2, the light source unit B1 can further shorten the electric wire 46 that electrically connects the communication device 4 and the power supply device 2. As a result, the light source unit B1 can further improve the noise resistance of the wireless signal.

Here, a power cable 8 for feed wiring may be placed between one side plate 31 of the mounting plate 3 and the power supply device 2 (see FIG. 6). In the light source unit B1, the circuit board 42 is housed in the case 43 so as to be aligned with the wall farther from the power cable 8 (the rear wall 432 of the case 43). In other words, the light source unit B1 can improve noise resistance in wireless signals by separating the circuit board 42 of the communication device 4 from the power cable 8.

(2) Embodiment 2
(2-1) Light Source Unit A light source unit B2 according to a second embodiment of the present disclosure (hereinafter, abbreviated as light source unit B2) is configured so that a communication device 4 receives a wireless signal using radio waves as a medium. However, among the components of the light source unit B2, the components common to the light source unit B1 are denoted by the same reference numerals and illustrations and descriptions thereof are omitted as appropriate.

As shown in FIG. 9, the communication device 4 in the light source unit B2 includes a wireless communication circuit 48 and a case 43 that houses the wireless communication circuit 48.

The wireless communication circuit 48 has a rectangular circuit board 480, a wireless communication module 481 mounted on the surface of the circuit board 480, and an antenna 482 formed on the surface of the circuit board 480 by a conductor (copper foil).

The wireless communication module 481 receives a wireless signal via the antenna 482, for example, a wireless signal carried by radio waves in the 920 MHz band, acquires control information from the wireless signal, converts the control information into a PWM signal, and transmits the converted PWM signal to the lighting circuit 20 via the electric wire 46.

The case 43 has a configuration that is almost the same as the case 43 of the light source unit B1 according to the first embodiment, except that it does not have the opening 44 and the peripheral wall 45. In other words, since the case 43 is made of a material (synthetic resin) that transmits radio waves, unlike an infrared signal, it is not necessary to provide the opening 44 and the peripheral wall 45.

On the other hand, since the mounting plate 3 facing the communication device 4 is made of metal, a through hole 33 is necessary to pass wireless signals that use radio waves as a medium. The through hole 33 is formed in a rectangular shape. The through hole 33 is also located in a position that faces the antenna 482 along the thickness direction of the bottom plate 30 and does not overlap with the light source module 1. However, the through hole 33 may also be located in a position that does not face the antenna 482 along the thickness direction of the bottom plate 30 and does not overlap with the light source module 1.

In the light source unit B2, the through hole 33 is also provided in a position along the thickness direction of the mounting plate 3 (bottom plate 30) that does not overlap with the light source module 1, so that it is possible to improve the reception sensitivity of wireless signals while achieving uniform light distribution characteristics.

(3) Summary The light source unit (B1; B2) according to the first aspect of the present disclosure includes a light source module (1), a power supply device (2), a mounting plate (3), and a communication device (4). The light source module (1) has a plurality of light-emitting elements (LEDs 10) and a substrate (11) on which the plurality of light-emitting elements are mounted. The power supply device (2) supplies current to the plurality of light-emitting elements to cause them to emit light. The mounting plate (3) has the light source module (1) attached to its front surface and the power supply device (2) attached to its back surface. The communication device (4) receives a wireless signal and transmits control information contained in the wireless signal to the power supply device (2). The power supply device (2) is configured to adjust the supply of current according to the control information. The mounting plate (3) has through holes (32; 33) that penetrate from the front surface to the back surface and allow wireless signals to pass through. The through holes (32; 33) are provided at positions that do not overlap with the light source module (1) when viewed from the thickness direction of the mounting plate (3).

The light source unit (B1; B2) according to the first embodiment has through holes (32; 33) at positions that do not overlap with the light source module (1) when viewed from the thickness direction of the mounting plate (3), so that it is possible to improve the reception sensitivity of wireless signals while achieving uniform light distribution characteristics.

The light source unit (B1; B2) according to the second aspect of the present disclosure can be realized by combining it with the first aspect. In the light source unit (B1; B2) according to the second aspect, it is preferable that the mounting plate (3) and the substrate (11) are each formed to be long. It is preferable that the through holes (32; 33) are provided in a position adjacent to the substrate (11) along the short side direction of the mounting plate (3).

The light source unit (B1; B2) according to the second embodiment has through holes (32; 33) provided at positions adjacent to the substrate (11) along the short side direction of the mounting plate (3), so that the mounting plate (3) can be made smaller in the longitudinal direction.

The light source unit (B1; B2) according to the third aspect of the present disclosure can be realized by combining it with the first or second aspect. In the light source unit (B1; B2) according to the third aspect, it is preferable that the communication device (4) is configured to receive a wireless signal using electromagnetic waves as a medium.

The light source unit (B1; B2) according to the third aspect allows the communication device (4) to be made smaller than when the communication device (4) receives a wireless signal using a medium other than electromagnetic waves (e.g., ultrasonic waves, etc.).

The light source unit (B1; B2) according to the fourth aspect of the present disclosure can be realized by combining it with the third aspect. In the light source unit (B1; B2) according to the fourth aspect, the communication device (4) preferably has a receiving unit (40) that receives a wireless signal using infrared rays as a medium. The communication device (4) is preferably configured so that the receiving unit (40) faces the through hole (32; 33) along the thickness direction of the mounting plate (3).

The light source unit (B1; B2) according to the fourth aspect can reduce the possibility of erroneously receiving a radio signal (infrared signal) transmitted to another light source unit by narrowing the range in which the receiver (40) can receive a radio signal (infrared signal).

The light source unit (B1; B2) according to the fifth aspect of the present disclosure can be realized by combining it with the fourth aspect. In the light source unit (B1; B2) according to the fifth aspect, it is preferable that the through hole (32; 33) is formed in a circular shape.

The light source unit (B1; B2) according to the fifth aspect has a circular through hole (32; 33), so that the directivity of the wireless signal at the receiving section (40) can be made closer to omnidirectional.

The light source unit (B1; B2) according to the sixth aspect of the present disclosure can be realized by combining it with any of the first to fifth aspects. The light source unit (B1; B2) according to the sixth aspect preferably includes a cover (5) that is translucent and is attached to the mounting plate (3) so as to cover the light source module (1).

The light source unit (B1; B2) according to the sixth aspect can irradiate the light emitted from the light source module (1) to the illumination space through the cover (5), and can receive a wireless signal through the cover (5) at the receiver (40).

The lighting fixture (A1) according to the seventh aspect of the present disclosure includes a light source unit (B1; B2) according to any one of the first to sixth aspects, and a fixture body (6) that supports the light source unit (B1; B2).

The lighting fixture (A1) according to the seventh aspect can improve the reception sensitivity of wireless signals while achieving uniform light distribution characteristics.

A1 Lighting fixture B1, B2 Light source unit 1 Light source module 2 Power supply device 3 Mounting plate 4 Communication device 10 LED (light emitting element)
11 Substrate 32 Through hole 33 Through hole

Claims (5)

a light source module having a plurality of light emitting elements and a substrate on which the plurality of light emitting elements are mounted;
a power supply device that supplies current to the plurality of light emitting elements to cause them to emit light;
a mounting plate on which the light source module is attached on a front surface and the power supply device is attached on a rear surface;
a communication device that receives a wireless signal and transmits control information included in the wireless signal to the power supply device;
Equipped with
the power supply device is configured to adjust the supply of current in response to the control information;
the mounting plate has a through hole that penetrates from the front surface to the back surface and allows the wireless signal to pass through;
The through hole is provided at a position not overlapping with the light source module when viewed from a thickness direction of the mounting plate,
the communication device includes a receiving unit that receives the wireless signal using infrared rays as a medium, and a case that accommodates the receiving unit;
The case has an opening that faces the receiving unit to the through hole along a thickness direction of the mounting plate, and a peripheral wall that is formed in a cylindrical shape so as to surround the opening and protrudes toward the through hole,
The peripheral wall is formed so that a tip of the peripheral wall contacts the periphery of the through hole in the mounting plate.
Light source unit. The mounting plate and the substrate are each formed to be elongated,
The through hole is provided at a position adjacent to the substrate along a short side direction of the mounting plate.
The light source unit according to claim 1 . The through hole is formed in a circular shape.
3. The light source unit according to claim 1 or 2. a cover having translucency and attached to the mounting plate so as to cover the light source module;
A light source unit according to any one of claims 1 to 3. A light source unit according to any one of claims 1 to 4,
A fixture body supporting the light source unit;
Equipped with
lighting equipment.

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