JP6650613B2 - lighting equipment - Google Patents

Description

  The present invention relates to a lighting fixture, and more particularly, to a lighting fixture using a plurality of types of solid-state light emitting elements having different light colors as light sources.

  As a conventional example, an LED lighting device described in Patent Literature 1 is exemplified. The LED lighting apparatus described in Patent Document 1 (hereinafter, referred to as a conventional example) is a so-called ceiling light that is directly attached to a ceiling, and supports first to third LED boards and the plurality of LED boards on a lower surface side. And a cover that covers the lower surface of the support. The support portion is formed in a disk shape when viewed from above and below. Each of the first LED substrate and the second LED substrate is formed in a partial ring shape, and a neutral white LED module that emits neutral white light and a light bulb color LED module that emits light of bulb color are arranged in the circumferential and radial directions. Are implemented so that they are arranged alternately along the line. Further, the cover has an inclined portion, a central portion, and an outer frame portion. The inclined portion is made of, for example, a milky white translucent resin, and covers the first LED substrate and the second LED substrate. Further, the inclined portion is inclined so as to be located lower toward the center. This conventional example emits light of any color temperature in the range from the bulb color to the neutral white color by emitting only one of the day white LED module and the bulb color LED module or emitting both at various ratios. Can be irradiated.

JP-A-2015-122329 (see [0035]-[0041] and FIGS. 4 and 5)

  By the way, in the above-mentioned conventional example, light (luminous flux) radiated from the daylight white LED module and the light bulb color LED module is diffused by the inclined portion of the cover, so that the brightness unevenness of each LED module is made inconspicuous.

  However, in general, a light-bulb color LED module having a low color temperature tends to be more noticeable in brightness unevenness than a day-white LED module having a high color temperature. In addition, the light bulb color LED module mounted near the outer periphery of the second LED board has a shorter distance to the inclined portion of the cover than the light bulb color LED module mounted on the first LED board, so that it is further increased. Brightness unevenness is easily noticeable.

  The present invention has been made in view of the above problems, and has as its object to make luminance unevenness of light having a relatively low color temperature less noticeable.

The lighting fixture of the present invention has a fixture main body attached to a building material, one or a plurality of light source modules attached to a front surface of the fixture main body, and a light-transmitting member that covers the light source module from the front. A cover attached to the instrument body, wherein the cover has a distance from the front surface of the instrument body different between a central portion and a peripheral portion, and the distance is shorter at the peripheral portion than at the central portion. is formed as the light source module comprises a substrate which is formed in an annular shape as a whole, a plurality of which are respectively mounted on a plurality of arcs along the circumferential direction of Oite the substrate on the front surface of the substrate and a first solid state light emitter and a plurality of second solid light-emitting element, at least one by one placing the first solid light-emitting element and the second solid light-emitting elements on the respective plurality of arcuate Is configured so that the first solid state light emitter of said plurality is configured to emit light of a first color temperature, said plurality of second solid light-emitting element is lower than the first color temperature The light source module is configured to emit light of a second color temperature, and the light source module is mounted on the plurality of arcs on a front surface of the substrate facing the peripheral portion of the cover. The number of elements is smaller than the number of the first solid state light emitting elements, the light flux of the second solid state light emitting element mounted on the front surface of the substrate per unit area at a portion opposed to the peripheral portion of the cover, At a portion facing the central portion of the cover, the unit is configured such that a light flux per unit area is smaller than that of the second solid state light emitting device mounted on the front surface of the substrate .

  The lighting fixture of the present invention has an effect that uneven brightness of light having a relatively low color temperature can be made less noticeable.

It is an exploded perspective view showing the lighting fixture concerning the embodiment of the present invention. It is sectional drawing which shows the lighting fixture which concerns on embodiment of this invention. It is a front view of the LED module in the lighting fixture concerning the embodiment of the present invention. It is sectional drawing of the principal part of the lighting fixture which concerns on embodiment of this invention. FIG. 5A is a circuit block diagram of the lighting fixture according to the embodiment of the present invention, and FIG. 5B is a circuit diagram of a first lighting circuit unit and a second lighting circuit unit in the power supply unit of the lighting fixture according to the embodiment of the present invention. is there.

  Hereinafter, a lighting fixture X according to an embodiment of the present invention will be described in detail with reference to the drawings. Note that the configurations described in the following embodiments are merely examples of the present invention. The present invention is not limited to the following embodiments, and various changes can be made according to the design and the like without departing from the technical idea according to the present invention.

  As shown in FIG. 1 and FIG. 2, a lighting fixture X according to the present embodiment (hereinafter, abbreviated as lighting fixture X) includes a fixture body 1 attached to a building material (ceiling finishing material) and a front surface of the fixture body 1 ( And a plurality (four in the illustrated example) of light source modules 2 attached to the lower surface). The lighting fixture X includes a cover 3 attached to the fixture main body 1 so as to cover the light source module 2 from the front. Further, the lighting fixture X includes an inner cover 4, an outer frame 5, a power supply unit 6, and the like. The lighting fixture X is a so-called ceiling light which is attached to a hanging ceiling Y provided on the ceiling of a house. Therefore, in FIG. 1, the direction from the appliance body 1 to the cover 3 is downward, and the direction from the cover 3 to the appliance body 1 is upward.

  The appliance main body 1 is formed in a substantially disk shape by a metal plate such as a steel plate. The device main body 1 has a support base 10 protruding downward. The support base 10 is formed in a substantially truncated cone shape. However, a concave portion 11 that is concave upward is provided at the center of the support base 10. A hooking sealing adapter 12 is detachably mounted on the bottom surface of the recess 11 (see FIGS. 1 and 2). The hooking sealing adapter 12 has a pair of hooking blades, and is attached to the hooking ceiling Y by engaging a pair of hooking blades with a hooking blade hook portion of the hooking ceiling Y provided on the ceiling. . However, since such a hanging ceiling Y and the hanging ceiling adapter 12 are conventionally well-known, detailed description is omitted.

  As shown in FIGS. 1 and 2, the outer frame 5 includes a cylindrical main body 50, an annular flange 51 protruding radially outward from a lower end of the main body 50, and an upper end of the main body 50. And three trapezoidal fixing pieces 52 projecting inward along the radial direction. However, it is preferable that the main body 50, the flange 51, and the three fixing pieces 52 are integrally formed of a synthetic resin such as a styrene resin. The outer frame 5 is configured to house the instrument main body 1 inside the main body 50 (see FIG. 2). The outer frame 5 is fixed to the instrument body 1 with three fixing pieces 52 screwed.

  As shown in FIGS. 1 and 2, the cover 3 is formed in a cylindrical shape with an open top and a bottom. In the cover 3, the lower bottom wall 30 is formed in a roughly dome shape. Further, the cover 3 has a plurality of protrusions that protrude radially outward from the outer peripheral surface of the upper end portion. These projections are preferably formed in a triangular or trapezoidal shape when viewed from above and below. The cover 3 is formed of a molded body in which a diffusing material is mixed in a light-transmitting synthetic resin such as an acrylic resin. The cover 3 is detachably attached to the instrument body 1 by hooking a plurality of projections to a plurality of hooks 13 provided near the outer peripheral edge on the lower surface of the instrument body 1.

  All four light source modules 2 have a common configuration. As shown in FIG. 3, each light source module 2 includes a substrate 20, a plurality (96 in the illustrated example) of first LEDs 21, and a plurality (32 in the illustrated example) of second LEDs 22. In FIG. 3, the second LED 22 is distinguished from the first LED 21 by giving a polka dot pattern (dot) to the second LED 22. The substrate 20 is preferably formed of a material having electrical insulation such as a glass cloth base epoxy resin, for example, in a shape obtained by dividing the ring into four equal parts in the circumferential direction (see FIG. 3). Further, the first LED 21 and the second LED 22 are mounted on the first surface (lower surface) of the substrate 20 on which the conductive path made of copper foil is formed. Further, two receptacle connectors 23 and 24 are also mounted on the first surface of the board 20. These two receptacle connectors 23 and 24 are electrically connected to a conductive path formed on the first surface. Here, one edge corresponding to the longer arc of the substrate 20 (the edge of the longer arc) is referred to as the outer peripheral edge 200 of the substrate 20, and the other edge (the shorter edge) corresponding to the shorter arc of the substrate 20. Is called the inner peripheral edge 201 of the substrate 20.

  The first LED 21 and the second LED 22 are configured such that a mounting substrate on which an LED chip is mounted is housed in a flat rectangular parallelepiped package together with an anode electrode and a cathode electrode. Note that an LED having such a structure is usually called an LED package. However, the first LED 21 and the second LED 22 have different emission colors. For example, the first LED 21 is configured by an LED package that emits white light having a color temperature (or correlated color temperature) of 6500 [K (Kelvin)]. In addition, the second LED 22 is configured by an LED package that emits light bulb color light having a color temperature (or correlated color temperature) of 2700 [K (Kelvin)]. In the following description, the color temperature of the light emitted from the first LED 21 is referred to as a first color temperature, and the color temperature of the light emitted from the second LED 22 is referred to as a second color temperature. However, the first color temperature is not limited to 6500 [K], and the second color temperature is not limited to 2700 [K].

  The plurality of first LEDs 21 and the plurality of second LEDs 22 are mounted on the first surface of the substrate 20 so as to be spaced from each other along the circumferential direction and the radial direction. The plurality of first LEDs 21 are electrically connected to each other by a conductive path formed on the first surface, and are also electrically connected to one of the receptacle connectors 23. Similarly, the plurality of second LEDs 22 are electrically connected to each other by a conductive path formed on the first surface, and are also electrically connected to the other receptacle connector 24. That is, an electric circuit (first light source circuit) is formed by the plurality of first LEDs 21 and one receptacle connector 23 and the conductive path, and another electric circuit (first light source circuit) is formed by the plurality of second LEDs 22 and the other receptacle connector 24 and the conductive path. 2 light source circuits) are formed. However, the first surface of the substrate 20 is preferably covered with a white resist except for the first LED 21, the second LED 22, and the receptacle connectors 23 and 24.

  The four light source modules 2 are arranged such that the second surface (upper surface) of the substrate 20 is in contact with the lower surface of the support base 10 of the instrument body 1 and are annularly arranged (see FIG. 1). These four light source modules 2 are fixed to the instrument body 1 by the inner cover 4 (see FIGS. 2 and 4).

  As shown in FIGS. 1 and 2, the inner cover 4 has a circular hole 40 at the center and a downward bulge on the outside of the hole 40 made of a translucent synthetic resin such as an acrylic resin or a polycarbonate resin. It is formed in an elliptical shape. The downwardly swelling portion of the inner cover 4 (hereinafter, referred to as a swelling portion 41) is formed such that the cross-sectional shape in the radial direction is approximately trapezoidal (see FIG. 2). The inner cover 4 is fixed to the instrument body 1 by being screwed to the support base 10 inside and outside the bulging portion 41. The inner cover 4 fixes the four light source modules 2 to the fixture body 1 by sandwiching the ends of the four substrates 20 on the outer peripheral edge 200 side and the inner peripheral edge 201 side between the support base 10, respectively. (See FIGS. 2 and 4).

  Here, the plug connectors 25 and 26 of the four light source modules 2 fixed to the appliance main body 1 are respectively connected to the two receptacle connectors 23 and 24 (see FIG. 4). These plug connectors 25 and 26 are electrically connected to electric wires. The electric wire is electrically connected to the output terminal of the power supply unit 6. That is, the four light source modules 2 are electrically connected to the power supply unit 6 via electric wires and connectors (receptacle connectors 23 and 24 and plug connectors 25 and 26).

  5A, the power supply unit 6 includes a first lighting circuit unit 60 and a second lighting circuit unit 61, a control unit 62, a power factor improvement circuit 63, a remote control receiving unit 64, and the like. The power factor improving circuit 63 is preferably configured by, for example, a boost chopper circuit. The power factor improvement circuit 63 is configured to improve the power factor by converting an AC voltage supplied from the commercial power system Z into a DC voltage higher than the effective value of the AC voltage.

  The first lighting circuit unit 60 includes a switching power supply circuit that reduces the DC voltage output from the power factor correction circuit 63 to a desired DC voltage (a driving voltage of the first LED 21). Similarly, the second lighting circuit section 61 includes a switching power supply circuit that reduces the DC voltage output from the power factor correction circuit 63 to a desired DC voltage (drive voltage of the second LED 22).

  As shown in FIG. 5B, the first lighting circuit unit 60 includes a step-down chopper circuit that is a switching power supply circuit, and a drive circuit 600 that drives the step-down chopper circuit. Similarly, as shown in FIG. 5B, the second lighting circuit unit 61 includes a step-down chopper circuit that is a switching power supply circuit, and a drive circuit 610 that drives the step-down chopper circuit. In the step-down chopper circuit, the cathode of the diode D1 is electrically connected to the output terminal on the positive side of the power factor improvement circuit 63, and a switching element is provided between the anode of the diode D1 and the output terminal on the negative side of the power factor improvement circuit 63. A series circuit of Q1 and resistor R1 is inserted. Further, a smoothing capacitor C1 formed of an electrolytic capacitor and an inductor L1 are electrically connected in series between a cathode and an anode of the diode D1, and a discharge resistor R2 is electrically connected to both ends of the smoothing capacitor C1. All the first light source circuits of the four light source modules 2 are electrically connected between the output terminals of the first lighting circuit unit 60 (output terminals of the step-down chopper circuit). Similarly, all the second light source circuits of the four light source modules 2 are electrically connected between the output terminals (output terminals of the step-down chopper circuits) of the second lighting circuit unit 61. The operation of such a step-down chopper circuit is conventionally well-known. When the switching element Q1 is switched at a high frequency, a DC voltage stepped down from an input voltage is supplied from both ends of a smoothing capacitor C1 to a first light source circuit and a second light source circuit. Is output to The drive circuits 600 and 610 are configured to switch the switching element Q1 according to a control signal provided from the control unit 62.

  The control unit 62 preferably includes hardware such as a microcontroller and a memory, and a program (software) stored in the memory and executed by a CPU (central processing unit) of the microcontroller. The operation (processing) of the control unit 62 described below is realized by the CPU of the microcontroller executing a program. Preferably, the power supply unit 6 includes a power supply circuit. The power supply circuit operates, for example, from the output voltage of the power factor improving circuit 63, the operating power of the first lighting circuit unit 60, the second lighting circuit unit 61, the control unit 62, the power factor improving circuit 63 and the remote control receiving unit 64 (5 volts) Or a 3.3 volt DC voltage).

  Here, the control unit 62 causes the switching power supply circuits of the first lighting circuit unit 60 and the second lighting circuit unit 61 to operate intermittently, and sets the duty ratio of the operation period (on period) to the period of the intermittent operation from 100%. Increase or decrease in the range of the lower limit (for example, 5%). Thereby, the control unit 62 can adjust (dim) the light amounts (luminous flux) of the first LED 21 and the second LED 22. That is, as the duty ratio increases, the light amounts of the first LED 21 and the second LED 22 increase, and as the duty ratio decreases, the light amounts of the first LED 21 and the second LED 22 decrease. When the duty ratio is 100% (the upper limit of the dimming range), the switching power supply circuit always operates, and the first LED 21 and the second LED 22 are turned on at the rated speed. In the following description, the above-described duty ratio is referred to as a dimming ratio.

  In the lighting fixture X, the first light color (white) of the first LED 21 and the second light color (bulb color) of the second LED 22 are different. Therefore, the control unit 62 changes the ratio between the light amount (light control ratio) of the first LED 21 and the light amount (light control ratio) of the second LED 22 to change the light color of the illumination light between the first light color and the second light color. It can be adjusted (toned) between. That is, the light color becomes closer to the first light color (the color temperature becomes higher) as the ratio of the light amount (light control ratio) of the first LED 21 increases, and the light color becomes higher as the ratio of the light amount (light control ratio) of the second LED 22 increases. It becomes close to the second light color (color temperature is low). When the dimming ratio of the first LED 21 is higher than 0% and the dimming ratio of the second LED 22 is 0%, the light color of the illumination light becomes equal to the first light color. On the other hand, when the dimming ratio of the first LED 21 is 0% and the dimming ratio of the second LED 22 is higher than 0%, the light color of the illumination light becomes equal to the second light color. In the following description, the ratio (ratio) between the dimming ratio of the first LED 21 and the dimming ratio of the second LED 22 is referred to as a toning ratio.

  The remote control receiver 64 receives (receives) an infrared signal transmitted from a remote controller (hereinafter, abbreviated as a remote controller), and outputs a control code demodulated from the received infrared signal to the controller 62. Then, the control unit 62 controls the first lighting circuit unit 60 and the second lighting circuit unit 61 so that the operation corresponding to the control code, for example, the dimming ratio and the toning ratio specified by the control code are achieved. Thus, the dimming ratio of the first LED 21 and the second LED 22 is adjusted.

  The power supply unit 6 has a metal case 67. The printed wiring board 65 is accommodated in the case 67. Various electronic components 66 constituting a first lighting circuit section 60, a second lighting circuit section 61, a control section 62, a power factor improving circuit 63, a remote control receiving section 64, and the like are mounted on the printed wiring board 65 (see FIG. 1). (See FIG. 2). The case 67 of the power supply unit 6 is arranged on the upper surface of the support base 10 of the instrument body 1 and is screwed to the instrument body 1 (see FIG. 2).

  The lighting fixture X diffuses light (illumination light) emitted from the four light source modules 2 with a diffusing material when passing through the (bottom wall 30 of) the cover 3 and irradiates the illumination space. In other words, the light emitted from the plurality of first LEDs 21 and the second LEDs 22 mounted on the light source module 2 is diffused by the (bottom wall 30 of) the cover 3, so that uneven brightness is less noticeable.

  Here, as described in the related art, the second LED 22 that emits light of a low color temperature tends to have more noticeable uneven brightness than the first LED 21 that emits light of a high color temperature. Further, since the bottom wall 30 of the cover 3 has a dome shape protruding downward, the distance to the bottom wall 30 of the cover 3 becomes shorter as the second LED 22 is mounted closer to the outer peripheral edge 200 of the substrate 20. (See FIG. 4). For this reason, there is a possibility that uneven brightness of light emitted from the second LED 22 mounted on a portion near the outer peripheral edge 200 of the substrate 20 may be conspicuous.

  Therefore, in the lighting fixture X according to the present embodiment, the light source module 2 is configured as follows in order to make the luminance unevenness of the light radiated from the second LED 22 less noticeable. That is, the light source module 2 converts the luminous flux of the second color temperature light radiated per unit area in the first region S1 into the second color temperature light radiated per unit area in the second region S2. It is configured to be smaller than the light flux (see FIG. 3). The first region S <b> 1 is a region facing the peripheral portion of the bottom wall 30 of the cover 3, that is, a region close to the peripheral edge 200 of the substrate 20, as indicated by a broken line in FIG. 3. The second region S2 is a region facing the central portion of the bottom wall 30 of the cover 3, that is, a region close to the inner peripheral edge 201 of the substrate 20, as indicated by a dashed line in FIG.

  Specifically, the light source module 2 calculates the average value of the distance between the second LEDs 22 mounted in the first area S1 as the average value of the distance between the second LEDs 22 mounted in the second area S2. It is configured to be larger than. In other words, the light source module 2 sets the number of the second LEDs 22 mounted per unit area in the first region S1 to be smaller than the number of the second LEDs 22 mounted per unit area in the second region S2. Preferably, it is configured. If the light source module 2 is configured as described above, the luminous flux of the light of the second color temperature radiated per unit area in the first region S1 becomes relatively small, so that the second light in the first region S1 is reduced. The uneven brightness of the light of the color temperature becomes less noticeable. In particular, if the second LED 22 is not mounted in the first area S1, the light source module 2 can make the luminance unevenness of the light of the second color temperature in the first area S1 more inconspicuous.

  As described above, the lighting fixture X includes the fixture main body 1 attached to a building material (for example, a ceiling finishing material). In addition, the lighting fixture X has one or more light source modules 2 attached to the front surface (lower surface) of the fixture main body 1, and has a light-transmitting property, and covers the light source module 2 from the front (below). And a cover 3 attached to the cover. The cover 3 is formed such that the distance from the lower surface of the instrument body 1 is different between the central part and the peripheral part, and the peripheral part is shorter in distance than the central part. The light source module 2 includes a substrate 20, and a plurality of first solid state light emitting devices (first LEDs 21) and a plurality of second solid state light emitting devices (second LEDs 22) mounted on the front surface (lower surface) of the substrate 20. I have. The plurality of first LEDs 21 are configured to emit light at a first color temperature (for example, 6500 [K]), and the plurality of second LEDs 22 are configured to emit light at a second color temperature (for example, lower than the first color temperature). 2700 [K]). Further, the light source module 2 emits a light flux of the second color temperature emitted per unit area at a portion facing the peripheral portion of the cover 3 per unit area at a portion facing the central portion of the cover 3. The second color temperature is configured to be smaller than the light flux of the second color temperature.

  If the luminaire X is configured as described above, the luminous flux of the light of the second color temperature radiated per unit area in the portion (first region S1) facing the peripheral portion of the cover 3 is relatively small. Therefore, the brightness unevenness of the light of the second color temperature in the first region S1 becomes less noticeable.

  Further, in the lighting fixture X, the number of the second LEDs 22 mounted on the front surface of the substrate 20 per unit area in the portion (first region S1) facing the peripheral portion of the cover 3 in the light source module 2 satisfies the following condition. It is preferable that it is comprised so that it may satisfy | fill. The condition is that the number is smaller than the number of the second LEDs 22 mounted on the front surface of the substrate 20 per unit area in a portion (the second region S2) opposed to the central portion of the cover 3. Is preferred.

  If the lighting fixture X is configured as described above, the luminance unevenness of the light of the second color temperature in the first region S1 can be made less noticeable only by reducing the number of the second LEDs 22 in the first region S1. .

  Further, in the lighting fixture X, the light source module 2 is configured such that the luminous flux of the second LED 22 mounted on the front surface of the substrate 20 per unit area at a portion (first region S1) opposed to the peripheral portion of the cover 3 satisfies the following conditions. It is preferable that it is comprised so that it may satisfy | fill. The condition is that the luminous flux is smaller than the luminous flux of the second LED 22 mounted on the front surface of the substrate 20 per unit area at a portion (the second region S2) facing the central portion of the cover 3. preferable. For example, the light source module 2 uses, as the second LED 22 mounted in the first area S1, an LED package having a smaller luminous flux when a rated voltage is applied than the second LED 22 mounted in the second area S2. It is preferable to be constituted. Alternatively, the light source module 2 is preferably configured such that the current supplied to the second LED 22 in the first area S1 is always smaller than the current supplied to the second LED 22 in the second area S2.

  If the luminaire X is configured as described above, the luminance unevenness of the light of the second color temperature in the first region S1 can be made less noticeable only by reducing the luminous flux of the second LED 22 in the first region S1. .

X Lighting fixture S1 First area S2 Second area 1 Instrument body 2 Light source module 3 Cover 20 Substrate 21 First LED (first solid state light emitting element)
22 Second LED (second solid state light emitting device)

Claims (1)

An appliance body attached to the building material, one or more light source modules attached to the front surface of the appliance body, and a cover having translucency and attached to the appliance body so as to cover the light source module from the front. With
The cover is formed such that the distance from the front surface of the instrument body is different between a central portion and a peripheral portion, and the peripheral portion is shorter in the distance than the central portion,
The light source module includes a substrate which is formed in an annular shape as a whole, a plurality of first solid light-emitting elements and a plurality which are respectively mounted on a plurality of arcs along the circumferential direction of Oite the substrate on the front surface of the substrate A plurality of second solid-state light-emitting elements, and configured to arrange at least one of the first solid-state light-emitting element and the second solid-state light-emitting element on each of the plurality of arcs,
The plurality of first solid state light emitting devices are configured to emit light of a first color temperature,
The plurality of second solid state light emitting devices are configured to emit light of a second color temperature lower than the first color temperature,
Further, in the light source module, on the front surface of the substrate facing the peripheral portion of the cover, the number of the second solid state light emitting elements mounted on the plurality of arcs is larger than the number of the first solid state light emitting elements. The light flux of the second solid-state light-emitting element mounted on the front surface of the substrate per unit area at a portion opposed to the peripheral portion of the cover is reduced per unit area at a portion opposed to the central portion of the cover. A lighting device configured to reduce the luminous flux of the second solid-state light-emitting element mounted on the front surface of the substrate .

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