JP2017208233A - Luminaire and lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire and a lighting fixture capable of achieving downsizing while suppressing a heat generation amount of a first solid light source.SOLUTION: A luminaire 10 includes a plurality of solid light sources 1, and a substrate 2 on which the plurality of solid light sources 1 are mounted. The plurality of solid light sources 1 include: a first solid light source 1A having a first light emitting element 11A; and a second solid light source 1B having a second light emitting element 11B. The first solid light source 1A and the second solid light source 1B are mounted on the substrate 2 in such a manner that a total sum of the distance with other solid light sources 1 in the second solid light source 1B becomes larger than the total sum of the distance with other solid light sources 1 in the first solid light source 1A. The first solid light source 1A and the second solid light source 1B are constituted in such a manner that the magnitude of the current flowing per unit area in the first light emitting element 11A becomes smaller than that of the current flowing per unit area in the second light emitting element 11B.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a lighting device and a lighting fixture, and more particularly to a lighting device and a lighting fixture including a plurality of solid state light sources.

  Conventionally, an LED light source including a plurality of LEDs has been provided (see, for example, Patent Document 1). The LED light source described in Patent Literature 1 includes a light emitter and a power control unit. The light emitter is configured by arranging a plurality of LEDs vertically and horizontally on a base. The power control unit controls the light output of the plurality of LEDs. The plurality of LEDs includes a first LED disposed in the center of the base and a second LED disposed in the periphery of the base.

  In the LED light source described in Patent Document 1, the amount of light from the second LED is increased compared to the amount of light from the first LED by making the power supplied to the second LED larger than the power supplied to the first LED. As a result, the light distribution to the front surface of the light emitting surface can be made substantially uniform.

JP-A-11-162660

  In the LED light source described in Patent Document 1, the power distribution to the first LED (first solid light source) is made smaller than the power supplied to the second LED (second solid light source), thereby distributing light to the front surface of the light emitting surface. The amount of heat generated by the first solid-state light source can be suppressed while maintaining a substantially uniform distribution. However, in the LED light source described in Patent Document 1, the power supplied to the first solid-state light source and the power supplied to the second solid-state light source must be controlled separately. There was a possibility that the whole light source would be enlarged.

  This invention is made | formed in view of the said subject, and it aims at providing the illuminating device and lighting fixture which can achieve size reduction, suppressing the emitted-heat amount of a 1st solid light source.

  An illumination device according to one embodiment of the present invention includes a plurality of solid light sources and a substrate. The plurality of solid state light sources are mounted on the substrate. The plurality of solid state light sources include a first solid state light source and a second solid state light source. The first solid-state light source and the second solid-state light source are configured such that the sum of distances between the second solid-state light sources and other solid-state light sources is greater than the sum of distances between the first solid-state light sources and other solid-state light sources. Mounted on the substrate. The first solid-state light source includes a first light emitting element, a first anode electrode and a first cathode electrode, and a first package. The first anode electrode and the first cathode electrode are electrically connected to the substrate and the first light emitting element. The first package houses the first light emitting device, the first anode electrode, and the first cathode electrode. The first solid state light source is configured such that a current flows through the first light emitting element via the first anode electrode and the first cathode electrode. The second solid-state light source includes a second light emitting element, a second anode electrode and a second cathode electrode, and a second package. The second anode electrode and the second cathode electrode are electrically connected to the substrate and the second light emitting element. The second package houses the second light emitting device, the second anode electrode, and the second cathode electrode. The second solid light source is configured such that a current flows to the second light emitting element through the second anode electrode and the second cathode electrode. The first solid-state light source and the second solid-state light source are configured such that a current flowing per unit area of the first light-emitting element is smaller than a current flowing per unit area of the second light-emitting element. Yes.

  The lighting fixture which concerns on 1 aspect of this invention is provided with the above-mentioned lighting device and the fixture main body holding the said lighting device.

  The present invention can achieve miniaturization while suppressing the amount of heat generated by the first solid-state light source.

FIG. 1A is a cross-sectional view of a lighting device and a lighting fixture according to an embodiment of the present invention attached to a ceiling. FIG. 1B is a cross-sectional view of a state in which a lighting device and a lighting fixture according to a modification of the embodiment of the present invention are attached to a ceiling. FIG. 2 is a cross-sectional view showing a part of a lighting device according to an embodiment of the present invention. FIG. 3A is a front view of a lighting device according to an embodiment of the present invention. FIG. 3B is a front view of an illumination apparatus according to Modification 1 of the embodiment of the present invention. FIG. 4A is a schematic circuit diagram of a lighting device according to an embodiment of the present invention. FIG. 4B is a schematic circuit diagram of an illumination apparatus according to Modification 1 of the embodiment of the present invention. FIG. 5 is a front view of an illumination device according to Modification 2 of the embodiment of the present invention. FIG. 6 is a front view of an illumination device according to Modification 3 of the embodiment of the present invention.

  Hereinafter, a lighting device and a lighting fixture according to an embodiment of the present invention will be specifically described with reference to the drawings. As illustrated in FIGS. 1A and 1B, the lighting apparatus 100 of the present embodiment is a ceiling-embedded lighting apparatus embedded in a ceiling 200, for example, and is used to illuminate a room. However, the configuration described below is merely an example of the present invention, and the present invention is not limited to the following embodiment. Therefore, various modifications other than this embodiment can be made according to the design and the like as long as they do not depart from the technical idea of the present invention.

  In the following description, unless otherwise specified, the upper and lower directions are defined as indicated by the “up” and “down” arrows in FIG. 1A. However, these directions are not intended to limit the use direction of the lighting fixture 100. In addition, the arrows indicating the directions in the drawings are merely shown for explanation, and do not accompany the substance.

  The lighting fixture 100 of this embodiment is provided with the illuminating device 10 and the fixture main body 20, as shown to FIG. 1A. The lighting fixture 100 further includes a light-transmitting plate 30 and a lighting device 40. This luminaire 100 is a separate luminaire in which the luminaire 10 and the lighting device 40 are arranged at different locations. That is, in this lighting fixture 100, the lighting device 10 housed in the fixture main body 20 is embedded in the ceiling 200, and the lighting device 40 is located on the back side of the ceiling 200 (the upper surface side in FIG. 1A). It is installed in a remote place.

  The instrument main body 20 is formed in a bottomed cylindrical shape whose lower end is opened, for example, by a metal with good heat dissipation such as an aluminum alloy. The illuminating device 10 is attached to an upper bottom portion inside the appliance main body 20 by an appropriate method such as screwing. A translucent plate 30 for diffusing light emitted from the illumination device 10 is attached to the opening at the lower end of the instrument body 20.

  The lighting device 40 includes a lighting circuit unit, a control circuit unit, and a power supply circuit unit. The lighting circuit unit supplies a load current to a plurality of solid state light sources 1 (described later) of the lighting device 10. The control circuit unit controls the operation of the lighting circuit unit based on the instructed dimming level, and increases or decreases the amplitude of the load current. The power supply circuit unit supplies DC power to the lighting circuit unit. As shown in FIG. 1A, the lighting device 40 is electrically connected to the lighting device 10 by a lead wire 42 through a connector 41.

  As shown in FIGS. 2 and 3A, the lighting device 10 includes a plurality (six in the illustrated example) of solid light sources 1 and a substrate 2 on which the plurality of solid light sources 1 are mounted. In the present embodiment, two solid light sources 1 among the plurality of solid light sources 1 are first solid light sources 1A, and the remaining four solid light sources 1 are second solid light sources 1B. The first solid-state light source 1A is mounted on the mounting surface 21 of the substrate 2 so that the sum of the distances from other solid-state light sources 1 excluding itself is relatively small. In other words, the first solid-state light source 1A is mounted near the center of the mounting surface 21 of the substrate 2 as shown in FIG. 3A. The second solid light source 1B is mounted on the mounting surface 21 of the substrate 2 so that the sum of the distances from other solid light sources 1 excluding itself is relatively large. In other words, as shown in FIG. 3A, the second solid light source 1B is mounted on the mounting surface 21 of the substrate 2 at a position away from the center so as to surround the first solid light source 1A. That is, in the first solid light source 1A and the second solid light source 1B, the sum of the distances from the other solid light sources 1 in the second solid light source 1B is larger than the sum of the distances from the other solid light sources 1 in the first solid light source 1A. It mounts on the mounting surface 21 of the board | substrate 2 so that it may become large. Here, the “other solid light sources 1 in the first solid light source 1 </ b> A” include the remaining first solid light sources 1 </ b> A and second solid light sources 1 </ b> B excluding self. Further, the “other solid light sources 1 in the second solid light source 1B” include the remaining first solid light sources 1A and second solid light sources 1B excluding self.

  As shown in FIG. 2, the first solid light source 1A includes a first light emitting element 11A, a first anode electrode 12A, a first cathode electrode 13A, and a first package 14A. As shown in FIG. 2, the second solid light source 1B includes a second light emitting element 11B, a second anode electrode 12B, a second cathode electrode 13B, and a second package 14B. Here, since the first solid light source 1A and the second solid light source 1B have the same configuration, only the first solid light source 1A will be described below, and the description of the second solid light source 1B will be omitted.

  The first light emitting element 11A is, for example, a blue light emitting diode (LED). The first light emitting element 11A is disposed on the bottom surface of a truncated cone-shaped recess 141 formed on the front side of the first package 14A formed in a rectangular parallelepiped shape.

  The first anode electrode 12 </ b> A is made of, for example, a copper alloy plated with silver, and includes an attachment part 121 and a contact part 122. The mounting portion 121 is L-shaped with a horizontal piece 1211 arranged parallel to the mounting surface 21 of the substrate 2 and a vertical piece 1212 extending in the normal direction of the mounting surface 21 from one end (the right end in FIG. 2) of the horizontal piece 1211. It is formed in a shape. The contact part 122 is formed so as to extend from the tip of the vertical piece 1212 of the attachment part 121 in the direction opposite to the horizontal piece 1211. The first anode electrode 12A is attached to the first package 14A such that the tip (right end in FIG. 2) of the contact portion 122 is exposed in the recess 141 of the first package 14A.

  Similar to the first anode electrode 12A, the first cathode electrode 13A is made of, for example, a copper alloy plated with silver, and includes an attachment portion 131 and a contact portion 132. The mounting portion 131 is L-shaped with a horizontal piece 1311 arranged in parallel with the mounting surface 21 of the substrate 2 and a vertical piece 1312 extending in the normal direction of the mounting surface 21 from one end (left end in FIG. 2) of the horizontal piece 1311. It is formed in a shape. The contact portion 132 is formed so as to extend from the tip of the vertical piece 1312 of the attachment portion 131 in the direction opposite to the horizontal piece 1311. The first cathode electrode 13A is attached to the first package 14A such that the front end (left end in FIG. 2) of the contact portion 132 is exposed in the concave portion 141 of the first package 14A.

  The first package 14A is formed in a rectangular parallelepiped shape, for example, from a heat resistant polymer. A conical recess 141 is formed on one surface (the upper surface in FIG. 2) of the first package 14A. The first light emitting element 11 </ b> A is attached to the bottom surface of the recess 141. Further, as described above, the contact portion 122 of the first anode electrode 12A and the contact portion 132 of the first cathode electrode 13A are exposed in the recess 141, respectively. In the first solid-state light source 1 </ b> A of the present embodiment, the anode of the first light emitting element 11 </ b> A and the contact portion 122 of the first anode electrode 12 </ b> A are electrically connected via the bonding wire 15. In the first solid-state light source 1 </ b> A of the present embodiment, the cathode of the first light emitting element 11 </ b> A and the contact portion 132 of the first cathode electrode 13 </ b> A are electrically connected via the bonding wire 16. The concave portion 141 of the first package 14A is filled with a silicone resin containing at least a phosphor.

  The substrate 2 is made of, for example, a printed wiring board formed in a square shape, and a plurality of solid light sources 1 are mounted on a mounting surface 21 (front surface in FIG. 3A) of the substrate 2. In the example shown in FIG. 3A, one first solid light source 1A and two second solid light sources 1B are formed from the upper side along the first direction (vertical direction in FIG. 3A) from the upper side. 1A and second solid light source 1B are mounted in this order. In the example shown in FIG. 3A, one first solid-state light source 1A and two second solid-state light sources 1B mounted along the first direction are arranged in a second direction orthogonal to the first direction (the left-right direction in FIG. 3A). ) In two rows. In other words, the two first solid light sources 1A are mounted near the center of the mounting surface 21 of the substrate 2, and the four second solid light sources 1B surround the two first solid light sources 1A. It is mounted at a position away from the center of the. Each of the two first solid-state light sources 1A described above has a relatively small distance from the other solid-state light sources 1 except for itself, and is easily affected by heat generated by the other solid-state light sources 1. In other words, the amount of heat generated by the first solid-state light source 1A increases as the ambient temperature of the first solid-state light source 1A rises due to heat from the other solid-state light source 1. Therefore, the first solid-state light source 1A is preferably configured so that its own heat generation amount is small.

  4A is a schematic circuit diagram of the plurality of solid state light sources 1 shown in FIG. 3A. As shown to FIG. 4A, in the illuminating device 10 of this embodiment, the some solid light source 1 (Two 1st solid light sources 1A and four 2nd solid light sources 1B) is electrically in series with respect to DC power supply E1. It is connected. Here, assuming that the forward voltage of the LED constituting a part of the solid-state light source 1 is V1, the forward current is I1, and the light emission efficiency is η, the heat generation amount of the LED is Q1 = I1 × V1 × (1−η). . When a plurality of solid light sources 1 are connected in series as in the present embodiment, the heat generation amount Q1 of the LED decreases as the light emission efficiency η increases. Therefore, in the present embodiment, it is preferable to increase the luminous efficiency η of the first solid light source 1A so that the calorific value Q1 of the first solid light source 1A is small. Specifically, as shown in FIG. 3A, the surface area of the first light emitting element 11A of the first solid state light source 1A is made larger than the surface area of the second light emitting element 11B of the second solid state light source 1B. In other words, the current (current density) flowing per unit area of the first light emitting element 11A is configured to be smaller than the current flowing per unit area of the second light emitting element 11B. Thereby, the light emission efficiency η (= η1) of the first light emitting element 11A is larger than the light emission efficiency η (= η2) of the second light emitting element 11B, and as a result, the heat generation amount Q1 of the first light emitting element 11A is reduced. be able to. That is, as described above, it is possible to reduce its own calorific value Q1 while being affected by the heat generated by the other solid-state light source 1, and as a result, the calorific value Q1 can be suppressed. Moreover, there is an advantage that the power supplied to the first solid-state light source 1A and the power supplied to the second solid-state light source 1B need not be controlled separately as in the conventional example. That is, according to the illuminating device 10 of this embodiment, the illuminating device 10 can be reduced in size while suppressing the calorific value Q1 of the first solid-state light source 1A.

  FIG. 3B is a front view of the illumination device 10 according to the first modification of the present embodiment. FIG. 4B is a schematic circuit diagram of the illumination device 10 according to the first modification of the present embodiment. Hereinafter, the illuminating device 10 of the modification 1 is demonstrated with reference to FIG. 3B and FIG. 4B. In the above-described embodiment, the current flowing per unit area of the first light emitting element 11A is reduced by making the surface area of the first light emitting element 11A larger than the surface area of the second light emitting element 11B. The current itself flowing through the first light emitting element 11A is reduced. In Modification 1, the surface area of the first light emitting element 11A and the surface area of the second light emitting element 11B are the same area.

  In the first modification, as shown in FIG. 3B, one first solid light source 1 </ b> A and two second solid light sources 1 </ b> B are arranged from the upper side along the first direction (vertical direction in FIG. 3B) from the upper side. The first solid light source 1A and the second solid light source 1B are mounted in this order. Moreover, in the modification 1, one 1st solid-state light source 1A and two 2nd solid-state light sources 1B mounted along the 1st direction are set to the 2nd direction (left-right direction in FIG. 3B) orthogonal to a 1st direction. It is mounted in two rows along.

  In the illumination device 10 of Modification 1, as shown in FIG. 4B, a parallel circuit including two first light emitting elements 11A electrically connected in parallel to each other and four second light emitting elements 11B are connected to a DC power supply E1. Are electrically connected in series. Therefore, in this case, the forward current I1 flows through the four second light emitting elements 11B, and the current I1 / 2 that is half the forward current I1 flows through the two first light emitting elements 11A. That is, since only two currents flow through the two first light emitting elements 11A as compared to the remaining four second light emitting elements 11B, the heat generation amount Q1 of the two first light emitting elements 11A is half that of the second light emitting elements 11B. It can be suppressed to the extent. Moreover, even in this case, there is an advantage that the power supplied to the first solid-state light source 1A and the power supplied to the second solid-state light source 1B do not need to be controlled separately as in the conventional example. That is, even in the illumination device 10 of the first modification, the illumination device 10 can be reduced in size while suppressing the calorific value Q1 of the first solid-state light source 1A. Here, the above-described forward current I1 is set to such a magnitude that the first light emitting element 11A can be turned on even if it is halved.

  Next, the illuminating device 10 which concerns on the modification 2 of this embodiment is demonstrated with reference to FIG. The illumination device 10 of Modification 2 includes a first light source group 3A to a seventh light source group 3G, and a substrate 2 on which the first light source group 3A to the seventh light source group 3G are mounted. In the illuminating device 10 of Modification 2, there is one first light source group 3A, and there are two second light source groups 3B to 7G light source groups 3G.

  In the first light source group 3A, as shown in FIG. 5, a plurality (22 in the illustrated example) of first solid light sources 1A are mounted at equal intervals along the first direction (vertical direction in FIG. 5). The first light source group 3 </ b> A is mounted near the center of the mounting surface 21 of the substrate 2. In each of the two second light source groups 3B, a plurality (20 in the illustrated example) of second solid light sources 1B are mounted at equal intervals along the first direction. These second light source groups 3B are respectively mounted on both sides of the first light source group 3A in a second direction (left-right direction in FIG. 5) orthogonal to the first direction. In each of the two third light source groups 3C, a plurality (19 in the illustrated example) of first solid light sources 1A are mounted at equal intervals along the first direction. The third light source group 3C is mounted outside the second light source group 3B in the second direction. In each of the two fourth light source groups 3D, a plurality (17 in the illustrated example) of second solid light sources 1B are mounted at equal intervals along the first direction. These fourth light source groups 3D are respectively mounted outside the third light source group 3C in the second direction. In each of the two fifth light source groups 3E, a plurality (16 in the illustrated example) of first solid-state light sources 1A are mounted at equal intervals along the first direction. These fifth light source groups 3E are respectively mounted outside the fourth light source group 3D in the second direction. In each of the two sixth light source groups 3F, a plurality (13 in the illustrated example) of second solid light sources 1B are mounted at equal intervals along the first direction. These sixth light source groups 3F are respectively mounted outside the fifth light source group 3E in the second direction. In each of the two seventh light source groups 3G, a plurality (9 in the illustrated example) of first solid-state light sources 1A are mounted at equal intervals along the first direction. The seventh light source group 3G is mounted outside the sixth light source group 3F in the second direction.

  Here, in Modification 2, the color temperature of the light emitted from the first solid light source 1A is a light bulb color (for example, 3500K to 2000K), and the color temperature of the light emitted from the second solid light source 1B is white (for example, 6500K to 4000K). And like the modification 2, the 1st solid light source 1A which radiates | emits light bulb-colored light is often arrange | positioned in the center vicinity of the mounting surface 21 of the board | substrate 2, and is a 2nd solid light source which radiates | emits white light. The luminous efficiency η is lower than that of 1B. In other words, the calorific value Q1 of the first solid light source 1A is larger than the calorific value Q1 of the second solid light source 1B.

  Therefore, in the illumination device 10 of Modification 2, the surface area of the first light-emitting element 11A of the first solid-state light source 1A is made larger than the surface area of the second light-emitting element 11B of the second solid-state light source 1B, as in the above-described embodiment. ing. Thereby, the fall of the luminous efficiency (eta) of 1 A of 1st solid light sources can be suppressed, As a result, the emitted-heat amount Q1 of 1 A of 1st solid light sources can be suppressed. Moreover, the second modification also has an advantage that the power supplied to the first solid-state light source 1A and the power supplied to the second solid-state light source 1B do not need to be controlled separately as in the conventional example. That is, even in the illumination device 10 according to the second modification, the illumination device 10 can be downsized while suppressing the heat generation amount Q1 of the first solid-state light source 1A.

  Furthermore, the illuminating device 10 which concerns on the modification 3 of this embodiment is demonstrated with reference to FIG. The illumination device 10 of Modification 3 includes an eighth light source group 4A to an eleventh light source group 4D and a substrate 2 on which the eighth light source group 4A to the eleventh light source group 4D are mounted. In the illumination device 10 of Modification 3, there is one eighth light source group 4A and two ninth light source groups 4B to 11D light source groups 4D.

  In the eighth light source group 4A, a plurality of (seven in the illustrated example) first solid-state light sources 1A that radiate white light are mounted at equal intervals along the first direction (vertical direction in FIG. 6). The eighth light source group 4 </ b> A is mounted near the center of the mounting surface 21 of the substrate 2. In each of the two ninth light source groups 4B, a plurality (six in the illustrated example) of second solid light sources 1B that emit blue light are mounted at equal intervals along the first direction. In each of the two tenth light source groups 4C, a plurality of (six in the illustrated example) second solid-state light sources 1B that emit green light are mounted at equal intervals along the first direction. Next to one side (left side in FIG. 6) of the eighth light source group 4A, the ninth light source group 4B and the tenth light source group are arranged such that the ninth light source group 4B is on the inner side and the tenth light source group 4C is on the outer side. One 4C is mounted. Next to the other side of the eighth light source group 4A (the right side in FIG. 6), the ninth light source group 4B and the tenth light source group are arranged such that the tenth light source group 4C is on the inner side and the ninth light source group 4B is on the outer side. One 4C is mounted. In each of the two eleventh light source groups 4D, a plurality (five in the illustrated example) of second solid light sources 1B that emit red light are mounted at equal intervals along the first direction. These eleventh light source groups 4D are respectively mounted on the outermost sides in a second direction (left-right direction in FIG. 6) orthogonal to the first direction. The eighth light source group 4A to the eleventh light source group 4D are preferably arranged so as to be accommodated in the circular region 5.

  In the illumination device 10 of Modification 3, an eighth light source group 4 </ b> A composed of a plurality of first solid light sources 1 </ b> A that emit white light is mounted near the center of the mounting surface 21 of the substrate 2. That is, the eighth light source group 4A is surrounded by the remaining ninth light source group 4B, tenth light source group 4C, and eleventh light source group 4D, and the ambient temperature increases due to heat generated from these light source groups. As a result, the resistance value of the first light-emitting element 11A of the first solid-state light source 1A constituting the eighth light source group 4A decreases, and the current flowing through the first light-emitting element 11A increases. And since the electric current which flows into 11 A of 1st light emitting elements becomes large, the emitted-heat amount Q1 of 1 A of 1st solid state light sources becomes large. Therefore, in the illumination device 10 of the third modification, the surface area of the first light emitting element 11A of the first solid-state light source 1A constituting the eighth light source group 4A is set to the remaining ninth to eleventh light source groups 4B to 4D. The surface area of the second light-emitting element 11B of the two-solid light source 1B is made larger. Thereby, the current flowing per unit area of the first light emitting element 11A is reduced, and as a result, the heat generation amount Q1 of the first solid state light source 1A can be suppressed. Moreover, the modification 3 also has an advantage that the power supplied to the first solid-state light source 1A and the power supplied to the second solid-state light source 1B do not have to be controlled separately as in the conventional example. That is, even in the lighting device 10 of the third modification, the lighting device 10 can be downsized while suppressing the heat generation amount Q1 of the first solid-state light source 1A.

  By the way, the illuminating device 10 demonstrated by the above-mentioned embodiment and the modifications 1-3 may be accommodated in the instrument main body 20 with the lighting device 40, as shown to FIG. The lighting fixture 100 includes a heat radiating plate 8 in addition to the lighting device 10, the fixture body 20, the translucent plate 30 and the lighting device 40. The heat radiating plate 8 is formed of, for example, an aluminum plate or a copper plate, and is attached to a surface opposite to the mounting surface 21 (surface on which the solid light source 1 is mounted) of the substrate 2. Moreover, the heat sink 8 is arrange | positioned so that the one part may contact the instrument main body 20 as shown to FIG. 1B. Therefore, the heat generated by the plurality of solid light sources 1 mounted on the substrate 2 can be radiated to the outside through the heat radiating plate 8 and the instrument main body 20.

  As described above, the illuminating device 10 of the present embodiment includes the plurality of solid light sources 1 and the substrate 2. A plurality of solid state light sources 1 are mounted on the substrate 2. The plurality of solid light sources 1 include a first solid light source 1A and a second solid light source 1B. In the first solid-state light source 1A and the second solid-state light source 1B, the sum of the distances from the other solid-state light sources 1 in the second solid-state light source 1B is larger than the sum of the distances from the other solid-state light sources 1 in the first solid-state light source 1A. It is mounted on the substrate 2 as described above. The first solid-state light source 1A includes a first light emitting element 11A, a first anode electrode 12A and a first cathode electrode 13A, and a first package 14A. The first anode electrode 12A and the first cathode electrode 13A are electrically connected to the substrate 2 and the first light emitting element 11A. The first package 14A houses the first light emitting element 11A, the first anode electrode 12A, and the first cathode electrode 13A. The first solid light source 1A is configured such that a current flows to the first light emitting element 11A via the first anode electrode 12A and the first cathode electrode 13A. The second solid light source 1B includes a second light emitting element 11B, a second anode electrode 12B and a second cathode electrode 13B, and a second package 14B. The second anode electrode 12B and the second cathode electrode 13B are electrically connected to the substrate 2 and the second light emitting element 11B. The second package 14B houses the second light emitting element 11B, the second anode electrode 12B, and the second cathode electrode 13B. The second solid light source 1B is configured such that a current flows to the second light emitting element 11B via the second anode electrode 12B and the second cathode electrode 13B. The first solid-state light source 1A and the second solid-state light source 1B are configured such that the current flowing per unit area of the first light-emitting element 11A is smaller than the current flowing per unit area of the second light-emitting element 11B. Yes. According to the illumination device 10 of the present embodiment, the magnitude of the current that flows per unit area of the first light emitting element 11A of the first solid state light source 1A flows per unit area of the second light emitting element 11B of the second solid state light source 1B. It is smaller than the current. Therefore, compared with the case where the magnitude | size of the electric current which flows into the unit area of the 1st light emitting element 11A is more than the electric current which flows into the 2nd light emitting element 11B, the emitted-heat amount Q1 of 1 A of 1st solid state light sources can be suppressed. Moreover, since it is not necessary to control separately the power supplied to the 1st solid light source 1A and the power supplied to the 2nd solid light source 1B like a prior art example, size reduction of the illuminating device 10 can also be achieved. it can. That is, according to the illuminating device 10 of this embodiment, size reduction can be achieved, suppressing the emitted-heat amount Q1 of the 1st solid light source 1A.

  Moreover, it is preferable that the area of the 1st light emitting element 11A is larger than the area of the 2nd light emitting element 11B like the illuminating device 10 of this embodiment. According to this configuration, the current flowing per unit area of the first light emitting element 11A can be reduced, and the heat generation amount Q1 of the first solid state light source 1A can be suppressed. However, this configuration is not an essential configuration of the lighting device 10, and the area of the first light emitting element 11A and the area of the second light emitting element 11B may be the same size. In this case, it is preferable to electrically connect at least two first light emitting elements 11A in parallel, for example, so that the current flowing per unit area of the first light emitting element 11A can be reduced.

  Moreover, it is preferable that the some solid light source 1 contains the some 1st solid light source 1A like the illuminating device 10 of this embodiment. In this case, it is preferable that the plurality of first solid light sources 1A are configured such that at least two first solid light sources 1A among the plurality of first solid light sources 1A are electrically connected to each other in parallel. According to this configuration, since at least two first solid-state light sources 1A are electrically connected to each other in parallel, the magnitude of the current that flows per unit area of the first light-emitting element 11A is determined as the unit of the second light-emitting element 11B. It can be made smaller than the current flowing per area. However, this configuration is not an indispensable configuration of the illumination device 10, and the number of the first solid-state light source 1A may be one. In this case, for example, the area of the first light emitting element 11A is preferably larger than the area of the second light emitting element 11B so that the current flowing per unit area of the first light emitting element 11A can be reduced.

  The lighting fixture 100 of this embodiment includes a lighting device 10 and a fixture body 20 that holds the lighting device 10. According to the lighting fixture 100 of the present embodiment, by providing the lighting device 10 described above, it is possible to reduce the size while suppressing the heat generation amount Q1 of the first solid light source 1A.

  Hereinafter, another modification of the present embodiment will be described.

  In the above-described embodiment and Modifications 1 to 3, the concave portion 141 of the first package 14A of the first solid-state light source 1A and the concave portion 141 of the second package 14B of the second solid-state light source 1B are filled with a silicone resin containing at least a phosphor. Has been. In contrast, the recesses 141 of the first package 14A and the second package 14B may be filled with a silicone resin that does not include a phosphor, or may not be filled with a silicone resin. That is, the solid light source 1 (the first solid light source 1A and the second solid light source 1B) is not limited to the configuration of the present embodiment, and can be changed according to the application.

  In the above-described modification 1, as shown in FIG. 4B, the two first solid light sources 1A are configured to be electrically connected to each other in parallel. However, at least two first solid light sources are used. 1A should just be mutually electrically connected in parallel. For example, when connecting four first solid light sources 1A, two first solid light sources 1A may be connected in parallel to form two sets of parallel circuits, and the two sets of parallel circuits may be connected in series. Then, the four first solid light sources 1A may be connected in parallel.

  In the above-described modification 2, the surface area of the first light emitting elements 11A of all the first solid light sources 1A is increased. For example, the first solid light sources 1A arranged near the center of the mounting surface 21 of the substrate 2 are used. Only the surface area of the single light emitting element 11A may be increased. For example, only the surface area of the first light-emitting element 11A of the first solid-state light source 1A that constitutes the first light source group 3A may be configured to be large. Further, among the first solid light sources 1A constituting the first light source group 3A, only the surface area of the first light emitting element 11A of the first solid light source 1A mounted near the center of the mounting surface 21 of the substrate 2 is increased. It may be configured.

  In the above-described modification 3, the surface area of the first light-emitting element 11A of the first solid-state light source 1A constituting the eighth light source group 4A is set to the ninth light source group 4B, the tenth light source group 4C, and the eleventh light source group 4D. The surface area of the second light-emitting element 11B of the second solid-state light source 1B to be configured is larger. On the other hand, for example, the solid light source 1 of the tenth light source group 4C that emits green light may be used as the first solid light source 1A. Here, when comparing the luminous efficiencies of the four light emitting elements that respectively emit the four lights described above, the luminous efficiency of the light emitting element that emits green light is the lowest. That is, the amount of heat generated by the light emitting element that emits green light is maximized. Therefore, it is preferable that the solid state light source 1 constituting the tenth light source group 4C is the first solid state light source 1A and the surface area of the first light emitting element 11A of the first solid state light source 1A is increased. According to the said structure, size reduction of the illuminating device 10 can be achieved, suppressing the emitted-heat amount Q1 of 1 A of 1st solid light sources.

  Further, in the first to third modifications, the heat generation amount Q1 of the first solid state light source 1A is reduced by increasing the surface area of the first light emitting element 11A of the first solid state light source 1A. On the other hand, in the above-described modified examples 1 to 3, similar to the above-described embodiment, the first solid-state light source 1A generates heat by electrically connecting at least two first solid-state light sources 1A to each other in parallel. You may be comprised so that quantity Q1 may be made small.

DESCRIPTION OF SYMBOLS 1 Solid light source 1A 1st solid light source 1B 2nd solid light source 2 Board | substrate 10 Illuminating device 11A 1st light emitting element 11B 2nd light emitting element 12A 1st anode electrode 12B 2nd anode electrode 13A 1st cathode electrode 13B 2nd cathode electrode 14A 1st 1 package 14B 2nd package 20 Appliance body 21 Mounting surface 100 Lighting fixture

Claims (4)

A plurality of solid light sources, and a substrate on which the plurality of solid light sources are mounted,
The plurality of solid state light sources includes a first solid state light source and a second solid state light source,
The first solid-state light source and the second solid-state light source are configured such that the sum of distances between the second solid-state light sources and other solid-state light sources is greater than the sum of distances between the first solid-state light sources and other solid-state light sources. Mounted on the board,
The first solid-state light source includes a first light emitting element, a first anode electrode and a first cathode electrode that are electrically connected to the substrate and the first light emitting element, the first light emitting element, and the first anode. An electrode and a first package housing the first cathode electrode, and configured to allow a current to flow to the first light emitting element via the first anode electrode and the first cathode electrode,
The second solid state light source includes a second light emitting element, a second anode electrode and a second cathode electrode electrically connected to the substrate and the second light emitting element, the second light emitting element, and the second anode. An electrode and a second package for housing the second cathode electrode, and configured to allow a current to flow to the second light emitting element through the second anode electrode and the second cathode electrode,
The first solid-state light source and the second solid-state light source are configured such that a current flowing per unit area of the first light-emitting element is smaller than a current flowing per unit area of the second light-emitting element. A lighting device characterized by comprising: The lighting device according to claim 1, wherein an area of the first light emitting element is larger than an area of the second light emitting element. The plurality of solid state light sources includes a plurality of the first solid state light sources,
The plurality of first solid light sources are configured such that at least two first solid light sources among the plurality of first solid light sources are electrically connected in parallel to each other. The lighting device described. A lighting fixture comprising: the lighting device according to any one of claims 1 to 3; and a fixture body that holds the lighting device.

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