Lighting equipment

Abstract

To provide an illuminating device that can be further downsized.SOLUTION: An illuminating device 1 comprises a first light source 8, a first optical member 101, a second light source 9, a second optical member 102, and a control circuit 52. The first light source 8 emits first light. The first optical member 101 is opposed to the first light source 8, and controls the distribution of the first light. The second light source 9 emits second light. The second optical member 102 is opposed to the second light source 9, and controls the distribution of the second light. The control circuit 52 controls the lighting of each of the first light source 8 and the second light source 9. The second optical member 102 is formed in an annular shape surrounding the first optical member 101. The thickness of the second optical member 102 is smaller than the thickness of the first optical member 101 in a direction in which the second light source 9 and the second optical member 102 are opposed to each other.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates generally to lighting devices. [Background technology]

[0002] The light emitting device of Patent Document 1 includes a first light emitting element arranged in a first region, a second light emitting element arranged in a second region around the first region, and an optical member. The color temperature of the light emitted from the second light emitting element is different from the color temperature of the light emitted from the first light emitting element. The optical member includes a first light collecting section, a second light collecting section, and a first light guiding section.

[0003] The first light collecting portion collects the light incident from the first region.

[0004] The second light collecting portion is disposed around the first light collecting portion and collects light that is emitted from the first region and does not enter the first light collecting portion. The second light collecting portion has a generally conical shape with a sunken apex.

[0005] The first light guiding section is disposed around the second light collecting section and guides the light incident from the second region by total internal reflection. The first light guiding section has a cylindrical shape that annularly surrounds the second light collecting section and a cross-sectional shape of the first light guiding section is a trapezoid. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2020-102314 A Summary of the Invention [Problem to be solved by the invention]

[0007] There is a demand for further miniaturization of lighting devices such as the light-emitting device of Patent Document 1.

[0008] The present disclosure has been made in consideration of the above-mentioned circumstances, and has an object to provide a lighting device that can be further miniaturized. [Means for solving the problem]

[0009] An illumination device according to one aspect of the present disclosure includes a first light source, a first optical member, a second light source, a second optical member, and a control circuit. The first light source emits a first light. The first optical member faces the first light source and controls the light distribution of the first light. The second light source emits a second light. The second optical member faces the second light source and controls the light distribution of the second light. The control circuit controls the lighting of each of the first light source and the second light source. The second optical member is formed in an annular shape surrounding the first optical member, and a thickness of the second optical member in a facing direction between the second light source and the second optical member Maximum of is the thickness of the first optical member Maximum of Less than. Effect of the Invention

[0010] As described above, the present disclosure has an effect of enabling further miniaturization of a lighting device. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of a lighting device according to an embodiment, seen from below. [Diagram 2] FIG. 2 is a perspective view of the lighting device as viewed from above. [Diagram 3] FIG. 3 is an exploded perspective view of the above lighting device. [Figure 4] FIG. 4 is a cross-sectional view of the above lighting device. [Diagram 5] FIG. 5 is a perspective view showing a main part of the above lighting device. [Figure 6] FIG. 6 is a perspective view of the light-transmitting cover of the lighting device as viewed from above. [Figure 7] FIG. 7 is a cross-sectional perspective view showing the light distribution of the above lighting device. [Figure 8]FIG. 8 is a cross-sectional perspective view showing another light distribution of the above lighting device. [Figure 9] FIG. 9 is a cross-sectional perspective view showing a light distribution in an illumination device according to a first modified example of the embodiment. [Figure 10] FIG. 10 is a block diagram showing an illumination device according to a second modified example of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The embodiments relate generally to a lighting device, and more particularly to a lighting device including two optical members each corresponding to two light sources.

[0013] Hereinafter, the lighting device according to the embodiment will be described in detail with reference to the drawings. However, each figure described in the following embodiment is a schematic diagram, and the ratio of the size and thickness of each component does not necessarily reflect the actual dimensional ratio. In addition, in the following description, unless otherwise specified, an X-axis, a Y-axis, and a Z-axis that are orthogonal to each other are defined in Figs. 1 to 3. Furthermore, for convenience, one of the two directions along the X-axis is the right direction, and the other direction is the left direction. Furthermore, one of the two directions along the Y-axis is the front direction, and the other direction is the rear direction. Furthermore, one of the two directions along the Z-axis is the upward direction, and the other direction is the downward direction. Moreover, these directions are not intended to limit the direction when the lighting device is used.

[0014] The embodiment described below is merely an example of the present disclosure. The present disclosure is not limited to the following embodiment, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.

[0015] (Embodiment) (1) Overview of the lighting equipment 1 to 4 show the overall configuration of a lighting device 1. FIG.

[0016] The lighting device 1 is a thin flat lamp as shown in Figures 1 and 2, and is attached to a socket (not shown) and is turned on by power supplied through the socket. The socket is attached to a structure such as a ceiling panel, a wall panel, or a floor panel, or to a bracket installed on the structure. By attaching the lighting device 1 to the socket, a lighting fixture such as a downlight, a spotlight, or a ceiling light is formed.

[0017] The overall shape of the lighting device 1 of this embodiment is a flat cylindrical shape (disk shape), and the outer size of the lighting device 1 is, for example, φ70 mm. Note that the outer size is not limited to a specific size, and may be other than φ70 mm.

[0018] Furthermore, the lighting device 1 is a replaceable lamp having a base that can be attached to and detached from a socket. The base of the lighting device 1 of this embodiment is a GX53 base that can be attached to and detached from a GX53 socket. Note that the base is not limited to a specific base and may be other than the GX53 base.

[0019] As shown in FIG. 3 and FIG. 4, the lighting device 1 includes a first light source 8, a second light source 9, a first optical member 101, a second optical member 102, and a control circuit 52. The first light source 8 emits a first light. The second light source 9 emits a second light. The first optical member 101 faces the first light source 8 and controls the light distribution of the first light. The second optical member 102 faces the second light source 9 and controls the light distribution of the second light. The control circuit 52 controls the lighting of each of the first light source 8 and the second light source 9. The second optical member 102 is formed in a ring shape surrounding the first optical member 101. In the opposing direction between the second light source 9 and the second optical member 102, the thickness D2 of the second optical member 102 is smaller than the thickness D1 of the first optical member 101 (see FIG. 4). Note that FIG. 4 is a cross-sectional view taken along the X1-X1 line in FIG. 1.

[0020] Therefore, in the lighting device 1, the thickness D2 of the second optical member 102 is smaller than the thickness D1 of the first optical member 101, so that the lighting device 1 can be made even more compact.

[0021] (2) Lighting equipment configuration As shown in FIGS. 3 and 4, the lighting device 1 includes a housing 2, a circuit holder 3, a heat sink 4, a circuit unit 5, an insulating plate 6, a module plate 7, a first light source 8, a second light source 9, and a light-transmitting cover 10.

[0022] (2.1) First light source As shown in FIG. 5, the first light source 8 includes a first LED (Light Emitting Diode) 81, a first substrate 82, and a pair of lead wires 83.

[0023] The first LED 81 is a substantially square-shaped chip-on-board (COB) type LED package, and corresponds to a first solid-state light-emitting element. The first LED 81 includes a plurality of LED chips arranged in a circular shape on the mounting surface of the package, and the plurality of LED chips are sealed with a resin containing a first phosphor. The first LED 81 emits light of a desired light color by transmitting light emitted from the plurality of LED chips through the first phosphor. The first light source 8 emits the light emitted by the first LED 81 as the first light. The first light emitted from the first light source 8 transmits through the translucent cover 10 and is irradiated below the translucent cover 10. The first light is preferably light having a color temperature of, for example, about 5000K.

[0024] The first substrate 82 is formed in a disk shape having a substantially square through hole 821 in the center, and the first LED 81 is fitted in the through hole 821. A plurality of L-shaped bending pieces 822 are formed on the periphery of the through hole 821. The bending pieces 822 bend upon contact with the edge of the first LED 81 fitted in the through hole 821, thereby holding the first LED 81.

[0025] Each of the pair of lead wires 83 is formed by bending a rod-shaped metal (copper, aluminum, etc.) conductor. Each of the pair of lead wires 83 is held by a pair of holding pieces 823 formed on the lower surface of the first substrate 82. The holding pieces 823 extend in an L-shape from the lower surface of the first substrate 82 and support the lead wire 83 from below. A first end 831 of the lead wire 83 is connected to an electrode of the first LED 81 by solder or the like. A second end 832 (see FIG. 3) of the lead wire 83 is bent upward and extends upward to be electrically connected to the circuit unit 5.

[0026] (2.2)Second light source The second light source 9 includes a plurality of second LEDs 91 and a second substrate 92, as shown in FIGS.

[0027] The second substrate 92 is formed in a disk shape having a circular through-hole 921 in the center, and the first substrate 82 of the first light source 8 is disposed in the through-hole 921. A plurality of second LEDs 91 are mounted on the lower surface of the second substrate 92 and arranged in two rows in an annular shape surrounding the through-hole 921. The second LEDs 91 are electrically connected to the circuit unit 5 via lead wires (not shown).

[0028] The second LED 91 is a surface mount device (SMD) type LED element, and corresponds to a second solid-state light emitting element. The second LED 91 includes an LED chip sealed with a resin containing a second phosphor, and the light emitted by the LED chip passes through the second phosphor to emit light of a desired color.

[0029] The second light source 9 emits light emitted by the multiple second LEDs 91 as the second light. The second light emitted from the second light source 9 passes through the light-transmitting cover 10 and is irradiated below the light-transmitting cover 10. The second light is preferably light having a color temperature of, for example, about 2700 K. The second light source 9 may be configured to include only one second LED 91.

[0030] (2.3) Module plate The above-mentioned first light source 8 and second light source 9 are supported by a module plate 7 formed in a substantially circular plate shape. Specifically, the first light source 8 and the second light source 9 are held by the module plate 7 such that the upper surface of the first substrate 82 of the first light source 8 and the upper surface of the second substrate 92 of the second light source 9 face the lower surface of the module plate 7.

[0031] The module plate 7 is preferably made of a metal material such as aluminum or a resin material with high thermal conductivity. In this case, the module plate 7 also functions as a heat sink that dissipates heat generated by the first light source 8 and the second light source 9.

[0032] (2.4) Insulating plate The insulating plate 6 is an insulating sheet formed into a substantially circular disk shape from an insulating resin material such as silicone or acrylic, and is disposed on the upper surface of the module plate 7. The lower surface of the insulating plate 6 contacts the upper surface of the module plate 7. The circuit unit 5 is disposed on the upper surface side of the insulating plate 6. That is, the insulating plate 6 has a function of electrically insulating the circuit unit 5 and the module plate 7.

[0033] Three support pieces 63 are formed at 120 degree intervals on the edge of the insulating plate 6. The support pieces 63 extend downward from the edge of the insulating plate 6, and a wedge-shaped locking claw 631 is formed at the lower end (tip) of the support pieces 63. The locking claw 631 locks with the lower surface of the edge of the module plate 7. That is, the insulating plate 6 holds the module plate 7 by the locking claw 631.

[0034] The insulating plate 6 is preferably made of an insulating material having high thermal conductivity. For example, the insulating plate 6 may include an insulating heat-conducting sheet having rubber elasticity made of an elastomer such as silicon having high thermal conductivity. Alternatively, the insulating plate 6 may be either a rigid plate or a flexible plate.

[0035] Then, with the module plate 7 sandwiched between the second substrate 92 of the second light source 9 and the insulating plate 6, the second substrate 92 is fixed to the insulating plate 6 by three screws B1. Specifically, the three insertion holes (not shown) formed in the second substrate 92, the three insertion holes 71 formed in the module plate 7, and the three screw holes 61 formed in the insulating plate 6 are all in communication with each other in the up-down direction along the Z axis. The screws B1 are fastened from below the second substrate 92, through the insertion holes of the second substrate 92 and the insertion holes 71 of the module plate 7, into the screw holes 61 of the insulating plate 6.

[0036] At this time, the second end 832 (see FIG. 3) of the lead wire 83 passes through the insertion hole 72 of the module plate 7 and the insertion hole 62 of the insulating plate 6, is positioned above the insulating plate 6, and is electrically connected to the circuit unit 5.

[0037] The second substrate 92, the insulating plate 6, and the module plate 7 may be fixed to one another with an adhesive or the like.

[0038] (2.5) Circuit Unit The circuit unit 5 includes a disk-shaped substrate 50 , a power supply circuit 51 formed on the upper surface of the substrate 50 , and a control circuit 52 formed on the lower surface of the substrate 50 .

[0039] The substrate 50 has wiring formed of a thin film of a conductor such as metal, and each of the pair of power supply terminals 53 is electrically connected to the wiring of the substrate 50 .

[0040] The power supply terminals 53 are pin terminals, and an AC voltage is applied to the pair of power supply terminals 53. The AC voltage is, for example, a commercial power system voltage (100V or 200V) and is input to the power supply circuit 51 and the control circuit 52. The pair of power supply terminals 53 in this embodiment constitute a GX53 base as a base of the lighting device 1.

[0041] The power supply circuit 51 includes a plurality of first circuit elements mounted on the upper surface of the substrate 50. The plurality of first circuit elements include, for example, resistors, capacitors, inductors, transformers, transistors, and diodes. The power supply circuit 51 constitutes a power conversion circuit that converts AC power supplied from a pair of power supply terminals 53 into DC lighting power, and supplies lighting power to each of the first light source 8 and the second light source 9. The power supply circuit 51 supplies the first lighting power to the first light source 8 via a lead wire 83. The power supply circuit 51 also supplies the second lighting power to the second light source 9 via a lead wire (not shown). That is, the power supply circuit 51 can supply lighting power to each of the first light source 8 and the second light source 9 individually. The power conversion circuit is preferably a constant power circuit that controls the output so that the output power matches the target power. The power conversion circuit may also be a step-down converter, a step-up converter, or a step-up / step-down converter.

[0042] The lighting device 1 includes the power supply circuit 51, so that it is not necessary to use a separate power supply device, and the degree of freedom in installation is improved.

[0043] The control circuit 52 includes a plurality of second circuit elements mounted on the lower surface of the substrate 50. The plurality of second circuit elements include, for example, a control integrated circuit (IC), a control power supply IC, a resistor, and a capacitor. The control circuit 52 controls the lighting of each of the first light source 8 and the second light source 9. Specifically, the control circuit 52 controls the power supply circuit 51 to control a first lighting power supplied to the first light source 8 and a second lighting power supplied to the second light source 9. In this embodiment, the control circuit 52 controls the turning on and off of the first light source 8 and the second light source 9.

[0044] (2.6) Housing The housing 2 has a disk-shaped bottom 21, an annular side wall 22 extending downward from the periphery of the bottom 21, and a hollow cylindrical protrusion 23 formed coaxially on the upper surface of the bottom 21. The diameter of the protrusion 23 is smaller than the diameter of the bottom 21, and the upper part of the housing 2 has a stepped structure by the upper surface of the bottom 21 and the protrusion 23. The housing 2 can also be said to be a substantially cylindrical tube with a closed upper surface and an open lower surface. The housing 2 accommodates the circuit holder 3, the heat sink 4, the power supply circuit 5, the insulating plate 6, the module plate 7, the first light source 8, and the second light source 9. The lower opening of the housing 2 is covered by a light-transmitting cover 10, and the housing 2 and the light-transmitting cover 10 correspond to the outer shell of the lighting device 1.

[0045] Furthermore, a pair of insertion holes 211 through which a pair of power supply terminals 53 described below are respectively inserted are provided in the bottom portion 21. The cross section of the insertion hole 211 is circular.

[0046] The housing 2 is formed from a resin material such as polybutylene terephthalate (PBT) or a metal material such as aluminum.

[0047] (2.7) Circuit holder The circuit holder 3 is a holding member that holds the heat sink 4 and the circuit unit 5. The circuit holder 3 is made of a resin material such as PBT, a metal material, or the like. In order to ensure electrical insulation between the heat sink 4 and the circuit unit 5, the circuit holder 3 is preferably made of an insulating material such as an electrically insulating resin material.

[0048] Specifically, the circuit holder 3 comprises a frame body 31, a side wall 32 formed on the edge of the frame body 31, a pair of insertion holes 33 formed in the frame body 31, and three support pieces 34 and three regulating pieces 35 formed on the edge of the frame body 31.

[0049] The frame 31 is a frame formed of a flat plate, and has a through hole 311 having a circular cross section with its axis in the vertical direction. The side wall 32 is an arc-shaped wall extending upward from the edge of the frame 31. The outer surface of the side wall 32 faces the inner surface of the side wall 22 of the housing 2.

[0050] The pair of insertion holes 33 are formed in the frame body 31 at 180 degree intervals, and are insertion holes having a circular cross section with the vertical axis as their axis. The pair of insertion holes 33 communicate with the pair of insertion holes 211 of the housing 2, and a pair of power terminals 53 are inserted therethrough, respectively.

[0051] The three support pieces 34 are formed at 120 degree intervals on the edge of the frame body 31. The support pieces 34 extend downward from the edge of the frame body 31, and a wedge-shaped locking claw 341 is formed at the lower end (tip) of the support pieces 34. The locking claw 341 locks onto the lower surface of the edge of the substrate 50 of the circuit unit 5.

[0052] The three restriction pieces 35 are formed at intervals from each other on the edge of the frame body 31. The restriction pieces 35 extend downward from the edge of the frame body 31, and a step portion 351 is formed at the lower end (tip) of the restriction pieces 35. The step portion 351 is formed in a shape in which the inner peripheral surface of the frame body 31 is cut out into a rectangular shape, and the end face and upper surface of the substrate 50 of the circuit unit 5 fit into the step portion 351.

[0053] In other words, the locking claw 341 of the support piece 34 and the step portion 351 of the regulating piece 35 clamp the board 50 of the circuit unit 5, so that the circuit holder 3 clamps the circuit unit 5 in the vertical direction on the underside of the frame body 31, thereby holding the circuit unit 5.

[0054] (2.8) Heat sink The heat sink 4 is a heat dissipation member that is thermally coupled to the circuit unit 5, the first light source 8, and the second light source 9, and dissipates heat generated in the circuit unit 5, the first light source 8, and the second light source 9. The heat sink 4 is made of a metal such as aluminum, or a resin material with high thermal conductivity.

[0055] Specifically, the heat sink 4 includes a frame 41 and a side wall 42 formed on the edge of the frame 41 .

[0056] The frame 41 is a frame formed of a flat plate, and has a through hole 43 having a circular cross section with its axis in the vertical direction. The side wall 42 is an annular wall extending downward from the periphery of the frame 41. The outer surface of the side wall 42 faces the inner surface of the side wall 22 of the housing 2.

[0057] The frame 41 has three insertion holes 45 formed at 120 degree intervals. Then, a screw B2 is inserted through the insertion hole 45 from below, passes through the outside of the circuit holder 3, and is fastened into a screw hole 212 (see FIG. 3) formed in the lower surface of the bottom 21 of the housing 2. That is, with the circuit holder 3 sandwiched between the frame 41 of the heat sink 4 and the bottom 21 of the housing 2, the heat sink 4 is fixed to the housing 2 by the three screws B3.

[0058] The circuit unit 5 held by the circuit holder 3 is surrounded by the side wall 42 of the heat sink 4. The through hole 43 of the heat sink 4 fixed to the housing 2 fits into the periphery of the through hole 311 of the circuit holder 3. That is, the through hole 311 is positioned coaxially inside the through hole 43. Among the first circuit elements of the power supply circuit 51 of the circuit unit 5 held by the circuit holder 3, large components such as an electrolytic capacitor and a transformer are inserted through the through hole 311 and stored in the protrusion 23 of the housing 2.

[0059] (2.9) Translucent cover The light-transmitting cover 10 is a light-transmitting member having light-transmitting properties, and is attached to the lower end of the housing 2 so as to cover the lower opening of the housing 2. As the material for the light-transmitting cover 10, a light-transmitting material such as a light-transmitting resin material such as acrylic or polycarbonate, or a glass material such as silica glass can be used.

[0060] As shown in Fig. 6, the light-transmitting cover 10 of this embodiment includes a disk-shaped bottom 103 and an annular side wall 104 extending upward from the periphery of the bottom 103. Three arc-shaped walls 105 are formed on the upper end surface of the side wall 104. Three support pieces 106 are formed at intervals of 120 degrees between each of the three walls 105. A wedge-shaped locking claw 107 is formed on the upper end (tip) of the support piece 106. The wall 105 fits into the inside of the side wall 22 of the housing 2 from below, and the locking claw 107 locks onto the inner surface of the lower end of the side wall 22, whereby the light-transmitting cover 10 is attached to the lower end of the housing 2.

[0061] The bottom 103 of the light-transmitting cover 10 attached to the lower end of the housing 2 is located below the first light source 8 and the second light source 9. That is, the vicinity of the center of the bottom 103 faces the first light source 8 along the Z axis (along the up-down direction), and the vicinity of the periphery of the bottom 103 faces the second light source 9 along the Z axis.

[0062] A first optical member 101 is formed in the center of the upper surface of the bottom 103, and a second optical member 102 is formed on the periphery of the upper surface of the bottom 103. That is, the facing direction of the first light source 8 and the first optical member 101 is the vertical direction along the Z axis. The facing direction of the second light source 9 and the second optical member 102 is the vertical direction along the Z axis. The light distribution of the first optical member 101 and the light distribution of the second optical member 102 are different. Therefore, the lighting device 1 can irradiate the first light emitted by the first light source 8 and the second light emitted by the second light source 9 with different light distributions from each other, and can change the lighting environment.

[0063] The first optical member 101 of this embodiment is a Fresnel lens. A truncated cone-shaped convex portion 101b is formed on the upper surface of the first optical member 101, which is coaxial with the center of the bottom portion 103. A plurality of annular grooves 101a are formed on the upper surface of the convex portion 101b, which are coaxial with each other. The first light source 8 facing the first optical member 101 along the Z axis includes a COB-type first LED 81, and the light-emitting area of ​​the first light source 8 is smaller than the light-emitting area of ​​the second light source 9. When light is incident on the upper surface of the first optical member 101, the first optical member 101 functions as a condenser lens that condenses the light emitted from the lower surface of the first optical member 101 to a focal point below the first optical member 101. Specifically, as shown in Fig. 7 (Y1-Y1 cross-sectional view of Fig. 1), when the first light is incident on the first optical member 101 from the first light source 8, the first optical member 101 distributes the light such that the first light emitted from the lower surface of the first optical member 101 passes through a path R1 toward a focal point below the first optical member 101. The path R1 gradually narrows toward the focal point directly below the first optical member 101. Therefore, the first light emitted by the first light source 8 is irradiated toward a relatively narrow area directly below the lighting device 1 from a circular emission surface 108a located at the center of the circular lower surface of the bottom 103.

[0064] The second optical member 102 of this embodiment is an annular diffusing lens formed along the outer periphery of the bottom portion 103, and surrounds the first optical member 101. The second optical member 102 faces the annular second light source 9 along the Z axis. Each of the second LEDs 91 included in the second light source 9 is an SMD type LED element, and the second light source 9 can be considered to be a surface light source. The second optical member 102 functions as a diffusing lens that diffuses the second light emitted by the second light source 9. Specifically, as shown in FIG. 8 (Y1-Y1 cross-sectional view of FIG. 1), when the second light is incident on the second optical member 102 from the second light source 9, the second optical member 102 distributes the second light so that it passes through a gradually expanding path R2, and emits it downward as diffused light. The light distribution angle of path R2 is larger than the light distribution angle of path R1, and the second light emitted by the second light source 9 is irradiated toward a relatively wide area around the lighting device 1 from an exit surface (first exit surface) 108b, which corresponds to the outer periphery of the annular shape on the circular lower surface of the bottom 103.

[0065] The diffusion lens is realized, for example, by applying a coating process, an etching process, a sandblasting process, or the like to the surface (at least one of the upper surface or the lower surface) of the light-transmitting cover 10, forming a laminated structure on the surface of the light-transmitting cover 10, or using a lens structure. Specifically, a resin containing a light diffusion material (fine particles) such as silica or calcium carbonate, or a milky white light diffusion film using a white pigment, dot pattern printing, uneven processing, or a lens array is used. A resin material in which a light diffusion material is dispersed may also be used.

[0066] The first optical member 101 described above includes a truncated cone-shaped convex portion 101b formed on the upper surface of the light-transmitting cover 10. On the other hand, the second optical member 102 described above has a flattened annular shape along the outer periphery of the light-transmitting cover 10. Therefore, when the "thickness" is defined as the dimension along the Z axis, the thickness D2 of the second optical member 102 is smaller than the thickness D1 of the first optical member 101. As a result, in the lighting device 1 of this embodiment, the thickness D2 of the second optical member 102 can be made relatively thin, and therefore the lighting device 1 can be further miniaturized.

[0067] The "thickness" can also be said to be the dimension in the opposing direction between the first light source 8 and the first optical member 101, or the dimension in the opposing direction between the second light source 9 and the second optical member 102. In Fig. 4, thickness D1 is the maximum dimension of the first optical member 101 along the Z axis (in the vertical direction) with the lower surface of the bottom 103 (the exit surface 108a in Figs. 7 and 8) as the reference plane, and is the dimension from the lower surface of the bottom 103 to the upper end of the convex portion 101b. Thickness D2 is the dimension of the second optical member 102 along the Z axis (in the vertical direction) with the lower surface of the bottom 103 (the exit surface 108b in Figs. 7 and 8) as the reference plane.

[0068] (3) Operation of lighting devices The control circuit 52 controls the power supply circuit 51 to control turning on and off of the first light source 8 and the second light source 9.

[0069] In this embodiment, the control circuit 52 turns off the second light source 9 when the first light source 8 is turned on, and turns off the first light source 8 when the second light source 9 is turned on. Specifically, the control circuit 52 receives an instruction signal from a device external to the lighting device 1. The instruction signal is a signal that instructs the lighting device 1 to turn on and off the first light source 8 and the second light source 9. The control circuit 52 controls the power supply circuit 51 in response to the instruction signal so that the power supply circuit 51 is in one of three control states: [first light source 8: turned on, second light source 9: turned off], [first light source 8: turned off, second light source 9: turned on], and [first light source 8: turned off, second light source 9: turned off].

[0070] Furthermore, the color temperature of the first light emitted by the first light source 8 is different from the color temperature of the second light emitted by the second light source 9. For example, it is preferable that the color temperature of the second light is lower than the color temperature of the first light. For example, the color temperature of the first light is 5000K (neutral white), and the color temperature of the second light is 2700K (warm white).

[0071] If the first light source 8 is on and the second light source 9 is off, the first light having a color temperature of 5000K is concentrated and irradiated into the illumination space below the illumination device 1. In this case, the concentrated first light having a color temperature of 5000K can create a natural atmosphere in the illumination space, and can generate an illumination space suitable for reading, for example.

[0072] When [first light source 8: off, second light source 9: on], the second light with a color temperature of 2700K is diffusely irradiated into the illumination space below the illumination device 1. In this case, the diffused second light with a color temperature of 2700K makes people in the illumination space feel relaxed.

[0073] In this way, the lighting device 1 can control the lighting environment by switching the light distribution and the light color.

[0074] (4) First Modification 9 instead of the second optical member 102. The second optical member 102A has an exit surface (first exit surface) 108b that emits the second light in a first direction (direction along the Z-axis) and an exit surface (second exit surface) 108c that emits the second light in a second direction (direction along the XY plane) intersecting the first direction.

[0075] The second optical member 102A is an annular diffusing lens formed along not only the outer periphery of the bottom 103 but also the entire periphery of the lower end of the sidewall 104, and surrounds the first optical member 101. The second optical member 102A functions as a diffusing lens that diffuses the second light emitted by the second light source 9. Specifically, as shown in FIG. 9, when the second light is incident on the second optical member 102 from the second light source 9, the second optical member 102 emits the second light downward and to the side as diffused light passing through a path R3 that gradually expands. The light distribution angle of the path R3 is larger than the light distribution angle of the path R2, and the second light emitted by the second light source 9 is emitted not only from the annular exit surface 108b of the bottom 103 but also from the exit surface 108c of the outer surface of the sidewall 104 that corresponds to the outer periphery of the annular shape at the lower end. The exit surface 108b emits the second light in a direction along the Z axis (downward). The emission surface 108c emits the second light in a direction along the XY plane (horizontal direction). As a result, the illumination device 1 can efficiently use the second light emitted by the second light source 9 and irradiate the second light toward a wider area around the illumination device 1.

[0076] (5) Second Modification FIG. 10 is a block diagram showing a part of the lighting device 1 of this modified example.

[0077] A series circuit of a first light source 8 and a switch element Q1, and a second light source 9 are connected in parallel between output terminals of a power supply circuit 51 of this modified example.

[0078] The switch element Q1 is disposed on a path along which a current flows from the power supply circuit 51 to the first light source 8. The switch element Q1 is, for example, a transistor, and in this embodiment, is a P-channel enhancement type MOSFET (Metal Oxide Semiconductor Field Effect Transistor). Note that the switch element Q1 may be, other than a P-channel MOSFET, for example, an N-channel MOSFET, a bipolar transistor, or another semiconductor switch element.

[0079] The first LED 81 of the first light source 8 is a COB type LED package and includes a plurality of LED chips 811 connected in series. In a pair of adjacent LED chips 811 among the plurality of LED chips 811, the cathode of one LED chip 811 is connected to the anode of the other LED chip 811. In the first light source 8, the high potential side of the series circuit of the plurality of LED chips 811 is the anode side, and the low potential side is the cathode side. In this case, the anode side of the first light source 8 is connected to the high potential output end of the pair of output ends of the power supply circuit 51 via the switch element Q1. That is, the anode side of the first light source 8 is connected to the source of the switch element Q1, and the drain of the switch element Q1 is connected to the high potential output end of the power supply circuit 51. That is, the source and drain of the switch element Q1 are connected in series to the first current path having a smaller forward voltage out of the first current path through which a current flows from the power supply circuit 51 to the first light source 8 and the second current path through which a current flows from the power supply circuit 51 to the second light source 9. A voltage signal from the control circuit 52 is applied to the gate of the switch element Q1 as a selection control signal J2. The cathode side of the first light source 8 is connected to the output end on the lower potential side of a pair of output ends of the power supply circuit 51.

[0080] The second light source 9 includes a plurality of second LEDs 91 connected in series. In a pair of adjacent second LEDs 91 among the plurality of second LEDs 91, the cathode of one second LED 91 is connected to the anode of the other second LED 91. In the second light source 9, the high potential side of the series circuit of the plurality of second LEDs 91 is the anode side, and the low potential side is the cathode side. In this case, the anode side of the second light source 9 is connected to the high potential output end of the pair of output ends of the power supply circuit 51. The cathode side of the second light source 9 is connected to the low potential output end of the pair of output ends of the power supply circuit 51.

[0081] The switch element Q1 switches between on and off (drain-source on and off) by the selection control signal J2. When the switch element Q1 is on, the electrical connection between the power supply circuit 51 and the first light source 8 is established. When the switch element Q1 is off, the electrical connection between the power supply circuit 51 and the first light source 8 is interrupted. On the other hand, the electrical connection between the power supply circuit 51 and the second light source 9 is established regardless of whether the switch element Q1 is on or off.

[0082] The power supply circuit 51 includes a constant power circuit that controls the output so that the lighting power matches the target power. In this case, the power supply circuit 51 sets the target power in response to a power control signal J3 from the control circuit 52, and matches the output lighting power to the target power by, for example, PWM (Pulse Width Modulation) control.

[0083] The forward voltage of the first light source 8 is the sum of the forward voltages of the multiple LED chips 811. The forward voltage of the second light source 9 is the sum of the forward voltages of the multiple second LEDs 91. In this modification, the forward voltage of the second light source 9 is greater than the forward voltage of the first light source 8.

[0084] For example, if the forward voltage of the LED chip 811 and the forward voltage of the second LED 91 are equal (or approximately equal), the number of series connections of the second LEDs 91 will be greater than the number of series connections of the LED chips 811. Also, if the forward voltage of the second LEDs 91 is greater than the forward voltage of the LED chip 811, the number of series connections of the second LEDs 91 may be the same as or less than the number of series connections of the LED chips 811.

[0085] The control circuit 52 receives an instruction signal J1 from a device external to the lighting device 1, and applies a selection control signal J2 to the gate of the switch element Q1 based on the instruction signal J1, and outputs a power control signal J3 to the power supply circuit 51. The switch element Q1 turns on or off in response to the selection control signal J2. The power supply circuit 51 adjusts the lighting power to match a target power in accordance with the power control signal J3.

[0086] When the switch element Q1 is off, the electrical connection between the power supply circuit 51 and the first light source 8 is interrupted, and the electrical connection between the power supply circuit 51 and the second light source 9 is conductive. Therefore, when the switch element Q1 is off, the lighting power output by the power supply circuit 51 is supplied to the second light source 9 out of the first light source 8 and the second light source 9. As a result, the second light source 9 is turned on and the first light source 8 is turned off, so that the second light having a color temperature of 2700 K is irradiated into the illumination space through the path R2 (see FIG. 8) or the path R3 (see FIG. 9).

[0087] When the switch element Q1 is on, the electrical connection between the power supply circuit 51 and the first light source 8 is conductive, and the electrical connection between the power supply circuit 51 and the second light source 9 is also conductive. However, since the forward voltage of the second light source 9 is greater than the forward voltage of the first light source 8, the lighting power output by the power supply circuit 51 is supplied to the first light source 8 out of the first light source 8 and the second light source 9. As a result, the first light source 8 is turned on and the second light source 9 is turned off, so that the first light having a color temperature of 5000 K is irradiated into the illumination space through the path R1 (see FIG. 7).

[0088] As described above, the lighting device 1 performs constant power control while switching between turning on the first light source 8 and the second light source 9. Therefore, the lighting device 1 can switch the light color without changing the power consumption.

[0089] Furthermore, the luminous efficiency of an LED is mainly determined by the luminous efficiency of a phosphor. Therefore, if the luminous efficiency is low, the amount of light emitted can be adjusted by increasing or decreasing the number of LEDs connected in series. If the amount of light emitted by the first light source 8 and the amount of light emitted by the second light source 9 are made the same (or approximately the same), the lighting device 1 can control the lighting environment by switching the light color without changing the brightness of the lighting space.

[0090] The first light source 8 and a series circuit of the second light source 9 and the switch element Q1 may be connected in parallel between the output terminals of the power supply circuit 51. In this case, the forward voltage of the first light source 8 is greater than the forward voltage of the second light source 9.

[0091] (6) Third Modification The first light source 8 includes a first LED 81 of a COB type, and the light emitting area of ​​the first light source 8 is smaller than the light emitting area of ​​the second light source 9. If the first light source 8 can be regarded as a point light source, the first optical member 101 may be a collimating lens that collimates the first light emitted by the first light source 8 into parallel light.

[0092] The color temperature of the first light emitted by the first light source 8 is not limited to 5000K, and may be appropriately selected within a color temperature range that can be considered as daylight white. The color temperature of the second light emitted by the second light source 9 is not limited to 2700K, and may be appropriately selected within a color temperature range that can be considered as light bulb white. The first light emitted by the first light source 8 may be light bulb white, and the second light emitted by the second light source 9 may be daylight white. The light source colors of the first light emitted by the first light source 8 and the second light emitted by the second light source 9 are not limited to daylight white and light bulb white. The light source colors of the first light emitted by the first light source 8 and the second light emitted by the second light source 9 may be any of daylight, daylight white, white, warm white, light bulb white, and the like. For example, the first light emitted by the first light source may be daylight white, and the second light emitted by the second light source may be light bulb white. Alternatively, the first light emitted by the first light source may be daylight color, and the second light emitted by the second light source may be natural white. Note that JIS Z 9112 specifies the following colors: daylight color: 5700 to 7100K, natural white: 4600 to 5500K, white: 3800 to 4500K, warm white: 3250 to 3800K, and incandescent color: 2600 to 3250K.

[0093] Furthermore, the color temperature of the first light emitted by the first light source 8 may be higher or lower than the color temperature of the second light emitted by the second light source 9.

[0094] That is, the color temperature of the first light emitted by the first light source 8 and the color temperature of the second light emitted by the second light source 9 are not limited to a specific color temperature. In addition, the color temperature of the first light may be lower than the color temperature of the second light. The combination of the color temperature of the first light and the color temperature of the second light is appropriately determined depending on the installation location of the lighting device 1, the purpose, the user's preference, and the like.

[0095] The first optical member 101 may be a lens other than a condenser lens or a collimator lens. The second optical members 102, 102A may be a lens other than a diffusion lens. In other words, the combination of the light distribution of the first optical member 101 and the light distribution of the second optical members 102, 102A is appropriately determined depending on the installation location of the lighting device 1, the purpose, the user's preference, and the like.

[0096] The base of the lighting device 1 is not limited to the GX53 base including the pair of power terminals 53, and may be other than the GX53 base. For example, the base of the lighting device 1 may be other base that complies with JIS (Japanese Industrial Standards), which is a Japanese standard. Furthermore, the base of the lighting device 1 may be a base that complies with the standards of a country other than Japan.

[0097] The solid-state light-emitting element is not limited to an LED, and may be another solid-state light-emitting element such as an organic electroluminescence (OEL).

[0098] The power supply circuit 51 is not limited to a configuration including a constant power circuit. For example, the power supply circuit 51 may include a constant current circuit. In this case, the constant current circuit controls the output so that the lighting current supplied to each of the first light source 8 and the second light source 9 matches a target current. The power supply circuit 51 may also include a constant voltage circuit. In this case, the constant voltage circuit controls the output so that the lighting voltage supplied to each of the first light source 8 and the second light source 9 matches a target voltage. In other words, the circuit method adopted by the power supply circuit 51 is not limited to a specific circuit method.

[0099] (7) Summary The lighting device (1) of the first aspect according to the above-mentioned embodiment includes a first light source (8), a first optical member (101), a second light source (9), a second optical member (102, 102A), and a control circuit (52). The first light source (8) emits a first light. The first optical member (101) faces the first light source (8) and controls the light distribution of the first light. The second light source (9) emits a second light. The second optical member (102, 102A) faces the second light source (9) and controls the light distribution of the second light. The control circuit (52) controls the lighting of each of the first light source (8) and the second light source (9). The second optical member (102, 102A) is formed in a ring shape surrounding the first optical member (101). In the opposing direction between the second light source (9) and the second optical members (102, 102A), the thickness (D2) of the second optical members (102, 102A) is smaller than the thickness (D1) of the first optical member (101).

[0100] In the above-described lighting device (1), the thickness (D2) of the second optical member (102, 102A) is smaller than the thickness (D1) of the first optical member (101), so that the lighting device (1) can be further reduced in size.

[0101] In the lighting device (1) of the second aspect according to the above-described embodiment, in the first aspect, it is preferable that the light distribution of the first light by the first optical member (101) is different from the light distribution of the second light by the second optical member (102, 102A).

[0102] The lighting device (1) described above is capable of controlling the lighting environment.

[0103] In the illumination device (1) of the third aspect according to the above-described embodiment, in the second aspect, it is preferable that the first optical member (101) collects the first light and the second optical member (102) diffuses the second light.

[0104] The lighting device (1) described above is capable of controlling the lighting environment.

[0105] In the illumination device (1) of the fourth aspect according to the above-mentioned embodiment, in any one of the first to third aspects, it is preferable that the second optical member (102, 102A) has a first exit surface (108b) that emits the second light in a first direction, and a second exit surface (108c) that emits the second light in a second direction intersecting the first direction.

[0106] The above-described lighting device (1) can efficiently use the second light emitted by the second light source (9) and irradiate the second light toward a wider area.

[0107] In the lighting device (1) of the fifth aspect according to the above-mentioned embodiment, in any one of the first to fourth aspects, the first light source (8) preferably includes a chip-on-board first solid-state light-emitting element (81), and the second light source (9) preferably includes a surface-mounted second solid-state light-emitting element (91).

[0108] In the above-described lighting device (1), the first light source (8) and the second light source (9) can be arranged efficiently.

[0109] In the illumination device (1) of the sixth aspect according to the above-mentioned embodiment, in any one of the first to fifth aspects, it is preferable that the color temperature of the first light is different from the color temperature of the second light.

[0110] The lighting device (1) described above is capable of controlling the lighting environment.

[0111] In the illumination device (1) of the seventh aspect according to the above-mentioned embodiment, in the sixth aspect, it is preferable that the color temperature of the second light is lower than the color temperature of the first light.

[0112] The lighting device (1) described above is capable of controlling the lighting environment.

[0113] It is preferable that the lighting device (1) of the eighth aspect according to the above-mentioned embodiment, in any one of the first to seventh aspects, further includes a power supply circuit (51) that supplies lighting power to each of the first light source (8) and the second light source (9).

[0114] The lighting device (1) described above includes a power supply circuit (51), which improves the flexibility of installation.

[0115] In the lighting device (1) of the ninth aspect according to the above-mentioned embodiment, in the eighth aspect, it is preferable that the power supply circuit (51) performs constant power control on the lighting power.

[0116] The above-mentioned lighting device (1) can control the lighting environment without changing the power consumption.

[0117] In the lighting device (1) of the tenth aspect according to the above-mentioned embodiment, in the ninth aspect, it is preferable that the lighting device (1) further includes a switch element (Q1) arranged in a path through which a current flows from the power supply circuit (51) to the first light source (8) and switching between conduction and interruption of the path. The forward voltage of the second light source (9) is greater than the forward voltage of the first light source (8).

[0118] The above-described lighting device (1) can realize switching of the first light source (8) and the second light source (9) with a simple configuration.

[0119] The lighting device (1) according to an eleventh aspect of the above-described embodiment is preferably any one of the eighth to tenth aspects, further comprising two power supply terminals (53) to which an AC voltage is applied. The power supply circuit (51) receives an AC voltage via the two power supply terminals (53) and supplies lighting power to each of the first light source (8) and the second light source (9).

[0120] The above-mentioned lighting device (1) is detachable from the socket, which makes it easy to replace the lighting device (1).

[0121] In the lighting device (1) of the twelfth aspect according to the above-mentioned embodiment, in the eleventh aspect, each of the two power supply terminals (53) is preferably a pin terminal.

[0122] The lighting device (1) described above can use a base such as GX53.

[0123] In the lighting device (1) of the thirteenth aspect according to the above-described embodiment, in any one of the first to twelfth aspects, it is preferable that the control circuit (52) turns off the second light source (9) when the first light source (8) is turned on, and turns off the first light source (8) when the second light source (9) is turned on.

[0124] The above-mentioned lighting device (1) is capable of switching lighting environments. [Explanation of symbols]

[0125] 1 Lighting equipment 101 First optical member 102, 102A Second optical member 108b Output surface (first exit surface) 108c Output surface (second exit surface) 51 Power supply circuit 52 Control circuit 53 Power terminal 8 1st light source 81 First LED (first solid-state light-emitting element) 9 Second light source 91 Second LED (Second solid-state light-emitting element) Q1 Switch element D1 Thickness of the first optical member D2 Thickness of the second optical member

Claims

1. A first light source that emits a first light; a first optical member facing the first light source and controlling a light distribution of the first light; a second light source that emits a second light; a second optical member facing the second light source and controlling a light distribution of the second light; a control circuit that controls the lighting of each of the first light source and the second light source, the second optical member is formed in an annular shape surrounding the first optical member, In a direction in which the second light source and the second optical member face each other, a maximum value of a thickness of the second optical member is smaller than a maximum value of a thickness of the first optical member. Lighting equipment.

2. A light distribution of the first light by the first optical member is different from a light distribution of the second light by the second optical member.

2. The lighting device of claim 1.

3. the first optical member condenses the first light, The second optical member diffuses the second light.

3. The lighting device of claim 2.

4. The second optical member includes a first exit surface that emits the second light in a first direction, and a second exit surface that emits the second light in a second direction that intersects with the first direction.

4. A lighting device according to claim 1.

5. The first light source includes a first solid-state light emitting element of a chip-on-board type, The second light source comprises a second surface-mounted solid-state light emitting device.

5. A lighting device according to any one of the preceding claims.

6. The color temperature of the first light is different from the color temperature of the second light.

6. A lighting device according to any one of the preceding claims.

7. The color temperature of the second light is lower than the color temperature of the first light.

7. The lighting device of claim 6.

8. The light source further includes a power supply circuit that supplies lighting power to each of the first light source and the second light source.

8. A lighting device according to any one of the preceding claims.

9. The power supply circuit controls the lighting power to a constant power level.

9. The lighting device of claim 8.

10. a switch element disposed on a path through which a current flows from the power supply circuit to the first light source and configured to switch between conduction and interruption of the path; The forward voltage of the second light source is greater than the forward voltage of the first light source.

10. The lighting device of claim 9.

11. Further comprising two power supply terminals to which an AC voltage is applied; The power supply circuit receives the AC voltage via the two power supply terminals and supplies the lighting power to each of the first light source and the second light source.

11. A lighting device according to any one of claims 8 to 10.

12. Each of the two power supply terminals is a pin terminal.

12. The lighting device of claim 11.

13. The control circuit turns off the second light source when the first light source is turned on, and turns off the first light source when the second light source is turned on.

13. A lighting device according to any one of the preceding claims.

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