JP2017073320A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire capable of lighting an all-night light properly according to the request of a user.SOLUTION: A luminaire 10 is the luminaire 10 which includes a plurality of light sources 114A-114C, and it includes: a reception part 115 for receiving a lighting indication of an all-night light; and a control part 116 for lighting only one part of the light sources as the all-night light out of the plurality of light sources 114A-114C, in the case where the reception part 115 has received the lighting indication of the all-night light. The reception part 115 also receives a switching instruction of the light source for lighting as the all-night light. The control part 116 also switches one part of the light sources for lighting as the all-night light out of the plurality of light sources 114A-114C, in the case where the reception part 115 has received the switching instruction.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a luminaire including a plurality of light sources.

  In recent years, LED lighting fixtures using LED light sources are becoming widespread. For example, Patent Literature 1 discloses a lighting fixture that has a normal lighting mode and an auxiliary lighting mode (nightlight), and selectively turns on some light-emitting elements in the auxiliary lighting mode.

JP 2012-59573 A

  In such a lighting fixture, it is desired that the nightlight can be appropriately turned on according to a user's request.

  Then, this invention provides the lighting fixture which can light a nightlight appropriately according to a user's request | requirement.

  The lighting fixture which concerns on 1 aspect of this invention is a lighting fixture provided with a some light source, Comprising: When the reception part which receives the lighting instruction of a nightlight, and the reception part receives the lighting instruction of the nightlight, the plurality of light sources A control unit that turns on only a part of the light source as the nightlight, the reception unit further receives a switching instruction of a light source that lights up as the nightlight, and the control unit further includes the reception unit When the switching instruction is received, among the plurality of light sources, the partial light sources that are turned on as the nightlight are switched.

  ADVANTAGE OF THE INVENTION According to this invention, the lighting fixture which can light a nightlight appropriately according to a user's request | requirement is implement | achieved.

FIG. 1 is a perspective view of the lighting apparatus according to Embodiment 1 as viewed from below. FIG. 2 is a perspective view of the luminaire according to Embodiment 1 as seen from above. 3 is a partially exploded perspective view of the lighting apparatus according to Embodiment 1. FIG. 4 is an exploded perspective view of the light-emitting device according to Embodiment 1. FIG. FIG. 5 is a block diagram of the lighting apparatus according to Embodiment 1. FIG. 6 is a circuit diagram of the lighting circuit according to the first embodiment. FIG. 7 is a diagram illustrating an operation mode of the lighting apparatus according to Embodiment 1. FIG. 8 is a diagram illustrating an operation unit according to the first embodiment. FIG. 9 is a flowchart showing the operation of the lighting fixture according to Embodiment 1 during night light. FIG. 10 is a diagram illustrating a modification of the operation mode of the lighting fixture according to Embodiment 1. FIG. 11 is a perspective view of the luminaire according to Embodiment 2 as viewed from below. FIG. 12 is a block diagram of a lighting fixture according to the second embodiment. FIG. 13 is a circuit diagram of a lighting circuit according to the second embodiment.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. Each figure is a schematic diagram and is not necessarily illustrated exactly.

  It should be noted that each of the embodiments described below shows a comprehensive or specific example. Numerical values, shapes, materials, components, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

  Each figure is a mimetic diagram and is not necessarily illustrated strictly. In each figure, substantially the same configuration is denoted by the same reference numeral, and redundant description may be omitted or simplified.

  In the following embodiments, a lighting fixture realized as a ceiling light will be described. In the drawings of the following embodiments, the Z-axis direction is, for example, the vertical direction, and the Z-axis + side may be described as the upper side or the ceiling side. Further, the Z-axis-side may be described as a lower side or a light emission side. The X-axis direction and the Y-axis direction are directions orthogonal to each other on a plane (horizontal plane) perpendicular to the Z-axis.

  In the drawings, for a structure or member having a plurality of structures having the same function, such as a screw hole, only one structure or member may be provided with a reference numeral.

(Embodiment 1)
[overall structure]
First, the structure of the lighting fixture which concerns on Embodiment 1 is demonstrated in detail. FIG. 1 is a perspective view of the lighting apparatus according to Embodiment 1 as viewed from below. FIG. 2 is a perspective view of the luminaire according to Embodiment 1 as seen from above. 3 is a partially exploded perspective view of the lighting apparatus according to Embodiment 1. FIG.

  As shown in FIGS. 1 to 3, the lighting fixture 10 includes a light guide plate 20 a to 20 c, a fixture main body 50 including a first fixture main body 40 and a second fixture main body 30, a lighting fixture adapter 60, and a light emitting device. 70a-70c. Moreover, the lighting fixture 10 is provided with light sources 114A-114C. The lighting fixture 10 includes a connecting member 35. In addition, in FIG. 1, the central axis J of the lighting fixture 10 is also illustrated.

  The luminaire 10 is a ceiling light that is attached to the ceiling and mainly illuminates the lower part. Hereinafter, each component of the lighting fixture 10 is demonstrated in detail.

  The luminaire adapter 60 is an adapter for attaching the luminaire 10 to a hooking sealing body (not shown) provided on the ceiling.

  A power supply circuit (not shown) that converts AC power supplied from a commercial system into DC power for causing the light emitting devices 70a to 70c to emit light is housed inside the first instrument body 40.

  AC power is supplied to the power supply circuit from a commercial system via the hook ceiling body and the lighting fixture adapter 60. The lighting fixture adapter 60 and the power supply circuit are electrically connected by a cable (not shown) with a connector. Connected.

  The second instrument main body 30 is fitted with and accommodated with the light emitting devices 70a to 70c. The second instrument body 30 is located below the first instrument body 40. Specifically, the second instrument main body 30 includes an upper cover 31 and a lower cover 32.

  The connection member 35 is a member for connecting the light guide plates 20a to 20c, the second instrument main body 30, the first instrument main body 40, and the light emitting devices 70a to 70c.

  The light guide plates 20a to 20c are plate-like optical members having a substantially hexagonal shape (deformed hexagonal shape) in plan view. The light guide plates 20a to 20c are arranged side by side in the circumferential direction around the central axis J in plan view. The light guide plates 20a to 20c are transparent members, but may be members having translucency. The light guide plates 20a to 20c are made of acrylic, for example, but may be polycarbonate, glass, or the like.

  The light emitting devices 70 a to 70 c are light sources of the lighting fixture 10. The light emitting devices 70a to 70c are arranged side by side in the circumferential direction around the central axis J in plan view. In plan view, the longitudinal direction of the light emitting devices 70a to 70c is a direction along the radial direction with the central axis J as the center.

  The light emitting device 70a is positioned between the light guide plates 20a and 20b in the circumferential direction, and emits light to each of the light guide plates 20a and 20b. Similarly, the light emitting device 70b is located between the light guide plates 20a and 20c in the circumferential direction, and emits light to each of the light guide plates 20a and 20c. The light emitting device 70c is located between the light guide plates 20b and 20c in the circumferential direction, and emits light to each of the light guide plates 20b and 20c. The light emitting devices 70a to 70b are electrically connected to a power supply circuit in the first instrument body 40 by a cable (not shown), and emit light using power supplied from the power supply circuit.

  Since the light emitting devices 70a to 70c have the same configuration, the detailed configuration of the light emitting device 70a will be described below with reference to FIG. FIG. 4 is an exploded perspective view of the light emitting device 70a. In FIG. 4, the light guide plate 20a is also illustrated.

  The light emitting device 70a includes a substrate 71 (light emitting module) on which a plurality of light emitting elements 72A and 72B are provided, and a holder 90 (an attachment member 73 and a front member 74).

  The light emitting element 72A is a surface mount type (SMD type) LED element that emits white light. The light emitting element 72B is a surface-mount type LED element that emits light bulb-colored light. For example, as shown in FIG. 4, the light emitting elements 72A and the light emitting elements 72B are alternately arranged.

[Circuit configuration]
FIG. 5 is a block diagram illustrating a configuration of the lighting fixture 10 according to the present embodiment. As illustrated in FIG. 5, the lighting fixture 10 includes a power supply circuit 110, lighting circuits 111 and 112 </ b> A to 112 </ b> C, light sources 113 and 114 </ b> A to 114 </ b> C, a reception unit 115, and a control unit 116.

  The light source 113 includes, for example, a series circuit of one or a plurality of light emitting elements 72A (light emitting diodes) that emit light having a correlated color temperature of 6500K (cool color light). Each of the light sources 114A to 114C includes a series circuit of one or a plurality of light emitting elements 72B (light emitting diodes) that emit light having a correlated color temperature of 2700K (warm color light), for example.

  Here, as shown in FIG. 4 and the like, light emitting elements 72A and 72B are provided on both side surfaces of the light emitting devices 70a to 70c. The light source 113 includes all the light emitting elements 72A provided on both side surfaces of the light emitting devices 70a to 70c. The light source 114A includes a light emitting element 72B provided on a side surface on the light guide plate 20a side of the light emitting device 70a and a side surface on the light guide plate 20a side of the light emitting device 70b. The light source 114B includes a light emitting element 72B provided on a side surface on the light guide plate 20b side of the light emitting device 70a and a side surface on the light guide plate 20b side of the light emitting device 70c. The light source 114C includes a light emitting element 72B provided on the side surface of the light emitting device 70b on the light guide plate 20c side and the side surface of the light emitting device 70c on the light guide plate 20c side.

  When a voltage obtained by multiplying the forward voltage of the light emitting element 72A by the number of the light emitting elements 72A (hereinafter referred to as a drive voltage) is applied to the light source 113, a current flows through the light source 113. Thereby, the light source 113 emits light (lights up). Similarly, a current flows when each of the light sources 114A to 114C is applied with a voltage obtained by multiplying the forward voltage of the light emitting element 72B by the number of the light emitting elements 72B (hereinafter referred to as a drive voltage). Thereby, each of light source 114A-114C light-emits (lights).

  The power supply circuit 110 includes, for example, a boost chopper circuit, and generates a DC voltage V1 higher than the AC voltage by boosting an AC voltage supplied from the commercial AC power supply 102.

  The lighting circuit 111 includes a switching power supply circuit that steps down the DC voltage V1 output from the power supply circuit 110 to a DC voltage having a desired voltage value (drive voltage of the light source 113). Each of the lighting circuits 112A to 112C includes a switching power supply circuit that steps down the DC voltage V1 output from the power supply circuit 110 to a DC voltage having a desired voltage value (drive voltage of the light sources 114A to 114C).

  FIG. 6 is a circuit diagram showing the configuration of the lighting circuit 111 and the light source 113.

  The lighting circuit 111 includes a step-down chopper circuit and a drive circuit 131 that drives the step-down chopper circuit. The step-down chopper circuit includes a diode D1, a switching element Q1, a resistor R1, a smoothing capacitor C1, and an inductor L1.

  The cathode of the diode D1 is connected to the positive output terminal of the power supply circuit 110. A switching element Q1 and a resistor R1 are connected in series between the anode of the diode D1 and the negative output terminal of the power supply circuit 110.

  A smoothing capacitor C1 and an inductor L1 that are electrolytic capacitors are connected in series between the cathode and anode of the diode D1. Discharge resistors R2 are connected to both ends of the smoothing capacitor C1.

  Further, a plurality of light emitting elements 72A of the light source 113 are connected in series between both ends of the smoothing capacitor C1. In FIG. 6, two light emitting elements 72A are shown, but the number of light emitting elements 72A may be arbitrary.

  In the step-down chopper circuit configured as described above, when the switching element Q1 is switched at a high frequency, a DC voltage obtained by stepping down the input voltage V1 is output to the light source 113 from both ends of the smoothing capacitor C1.

  In addition, the drive circuit 131 switches the switching element Q1 according to the control signal S1 provided from the control unit 116.

  Note that the configuration of the lighting circuits 112A to 112C is the same as that of the lighting circuit 111, for example. However, when the output voltage range of the lighting circuit 111 is different from the output voltage range of the lighting circuits 112A to 112C, circuit parameters and the like are different. Further, different control signals S1 to S4 are input from the control unit 116 to each of the lighting circuits 111 and 112A to 112C. Thereby, each of the lighting circuits 111 and 112A to 112C is controlled independently, so that lighting, extinction, dimming and the like of each of the light sources 113 and 114A to 114C are controlled independently.

  The control unit 116 includes hardware such as a microcomputer and a memory (for example, ROM or RAM), and a storage unit (for example, ROM) in which a program (software) executed by the microcomputer is stored. The operation (processing) of the control unit 116 described below is realized by the microcomputer executing a program. The operating power supply of the control unit 116 is created from the output voltage V1 of the power supply circuit 110 by a power supply circuit (not shown).

  The receiving unit 115 receives (receives) an infrared signal transmitted from the operation unit 101, demodulates the received infrared signal, and outputs a control code obtained by the demodulation to the control unit 116. And the control part 116 controls the lighting circuits 111 and 112A-112C so that it may become a light control ratio or a light control ratio corresponding to a control code (a light control command or a color control command).

  The operation unit 101 is, for example, a remote controller. The signal transmitted from the operation unit 101 is not limited to an infrared signal, but may be a radio signal using radio waves as a medium or an electric signal via a signal line.

[Operation]
FIG. 7 is a diagram illustrating an operation mode in the lighting fixture 10 according to the present embodiment. The lighting fixture 10 has a normal lighting mode and a nightlight mode. In the normal lighting mode, only the light source 113 is turned on and white light is emitted (FIG. 7A), and the light sources 114A to 114C are turned on and light bulb color light is emitted (FIG. 7). (B)) and a mode in which all of the light sources 113 and 114A to 114C are turned on ((c) in FIG. 7). Further, the normal lighting mode is a mode in which two light sources among the light sources 114A to 114C are lit ((d) to (f) in FIG. 7) and a mode in which one light source among the light sources 114A to 114C is lit (FIG. 7). (G) to (i)). In addition, it is possible to switch which light source among the light sources 114A to 114C is turned on.

  Furthermore, the brightness of each light source can be adjusted in each mode. In the mode in which all of the light sources 113 and 114A to 114C are turned on ((c) in FIG. 7), the ratio between the brightness of the light source 113 and the brightness of the light sources 114A to 114C can be adjusted.

  The control unit 116 intermittently operates the switching power supply circuits of the lighting circuits 111 and 112A to 112C, and adjusts the duty ratio of the operation period (on period) with respect to the cycle of the intermittent operation, whereby the light sources 113 and 114A to 114A. The light output of 114C is adjusted (dimmed).

  In the nightlight mode, only one of the light sources 114A to 114C is turned on ((j) to (l) in FIG. 7). In addition, it is possible to switch which light source among the light sources 114A to 114C is turned on. Also, the brightness of the light source can be adjusted even in the nightlight mode.

  Furthermore, in the nightlight mode, the light source is lit darker than in the normal lighting mode. For example, if it is possible to dimm from the minimum value L0 to the maximum value L1 in the normal mode and dimmable from the minimum value L2 to the maximum value L3 in the nightlight mode, the maximum value L3 is less than the minimum value L0. is there. A part of the adjustable range of the light source brightness in the normal mode may overlap with the adjustable range of the light source brightness in the nightlight mode.

  Hereinafter, an operation example for the lighting apparatus 10 will be described.

  FIG. 8 is a diagram illustrating an example of the operation unit 101. As shown in FIG. 8, the operation unit 101 is a remote controller and includes a plurality of operation buttons. Specifically, the operation unit 101 includes a lighting button, a light-off button, a nightlight button, a switching button, a light control button (bright, dark), and a color adjustment button (white, warm).

  When the user presses the lighting button, lighting is performed in the normal lighting mode. For example, the luminaire 10 is turned on in the same state as that immediately before the previous turn-off. In this state, every time the user presses the switching button, the number and position of the light sources to be turned on are sequentially switched. For example, each time the switching button is pressed, the state is switched in the order of (b), (d), (e), (f), (g), (h), and (i) in FIG. When the switching button is pressed, the state returns to the state (b) again.

  In the normal lighting mode, the illuminance (brightness) of the light source is changed by operating the dimming button. Further, when the toning button is pressed, the ratio of the white light to the light bulb color (the toning ratio) is changed.

  Next, operations and operation examples in the nightlight mode will be described. FIG. 9 is a flowchart showing the operation of the lighting device 10 in the nightlight mode.

  First, the control unit 116 determines whether or not an instruction to switch to the nightlight mode is received at a predetermined cycle (S101). For example, when the nightlight button of the operation unit 101 is pressed, the operation unit 101 transmits an instruction to switch to the nightlight mode to the lighting apparatus 10.

  When the control unit 116 receives an instruction to switch to the nightlight mode (Yes in S101), only a part of the light sources 114A to 114C is turned on with low illuminance (S102). For example, only some of the light sources are turned on in the same state as when the nightlight was turned off or when the nightlight was switched to normal lighting. Here, the state is the position and brightness of the light source to be turned on.

  Next, the control unit 116 determines whether a turn-off instruction or a normal lighting instruction is received at a predetermined cycle (S103), a dimming instruction is received (S104), or a switching instruction is received (S106). For example, when the turn-off button of the operation unit 101 is pressed, the operation unit 101 transmits a turn-off instruction to the lighting fixture 10. When the lighting button is pressed, the operation unit 101 transmits a normal lighting instruction to the lighting fixture 10. When the nightlight button is pressed again during nightlight, the operation unit 101 transmits a switching instruction to the lighting apparatus 10.

  When the control unit 116 receives a turn-off instruction or a normal lighting instruction (Yes in S103), the control unit 116 switches to the light-off or normal lighting mode (S108), and proceeds to step S101 again.

  On the other hand, the control part 116 changes the brightness of a light source, when the light control instruction | indication is received (S104, Yes) (S105). For example, when the dimming button of the operation unit 101 is pressed, the operation unit 101 transmits a dimming instruction to the lighting fixture 10.

  Moreover, the control part 116 switches the light source to light, when the switching instruction | indication is received (it is Yes at S106) (S107). For example, each time the nightlight button on the operation unit 101 is pressed, the light sources to be turned on are sequentially switched in a predetermined order. At this time, the light source after switching is turned on with the same brightness as that of the light source before switching.

  Note that the order of the processing illustrated in FIG. 9 is an example, and the present invention is not limited to this. For example, the order of the determination processes (S103, S104, and S106) may be arbitrary, and some of them may be performed simultaneously.

  The operation method shown here is an example, and the number and type of operation buttons provided in the operation unit 101 may be arbitrary. For example, a plurality of operation buttons that correspond one-to-one with a plurality of light sources may be provided, and the light sources may be turned on when an operation button corresponding to a certain light source is pressed.

(effect)
As described above, the lighting fixture 10 according to the present embodiment is a lighting fixture including a plurality of light sources 114A to 114C, and the reception unit 115 that receives a nightlight lighting instruction, and the reception unit 115 provides a nightlight lighting instruction. When received, the control unit 116 includes a controller 116 that turns on only a part of the light sources 114A to 114C as a night light. Here, a part of the light sources is a predetermined number of light sources, for example, one light source. The accepting unit 115 further accepts a switching instruction for a light source that is lit as a nightlight. Furthermore, when the reception unit 115 receives a switching instruction, the control unit 116 switches some of the light sources that are turned on as a nightlight among the plurality of light sources 114A to 114C.

  That is, the luminaire 10 has a function of switching a light source that is turned on during night light. Thereby, since the lighting fixture 10 can light a nightlight appropriately, a user's convenience can be improved.

  For example, when the user prefers a darker situation at bedtime or the like, the user can feel darker by turning on the light source opposite to the user. Alternatively, the user can set a light source to be lit so that the vicinity of the entrance / exit becomes brighter or the place where the clock or the like is installed becomes brighter.

  In addition, the reception unit 115 further receives a dimming instruction. In addition, when the reception unit 115 receives a dimming instruction, the control unit 116 switches the brightness of some light sources that are lit as nightlights, and after the brightness is switched, the reception unit 115 receives a switching instruction. Among the light sources 114 </ b> A to 114 </ b> C, some of the light sources that are turned on as night lights are switched, and some of the light sources that are switched according to the switching instruction are turned on with the brightness after switching according to the dimming instruction.

  That is, even when the light source that is turned on during nightlight is switched, the brightness before switching is maintained. Thereby, a user's convenience can be improved.

  In addition, during normal lighting, the control unit 116 turns on some or all of the plurality of light sources 114A to 114C with the first brightness, and sets a part of the plurality of light sources 114A to 114C as the night light. Lights up with a second brightness that is darker than one.

  That is, the same light source is used during normal lighting and during night light. Accordingly, there is an advantage that the number of light sources can be reduced as compared with the case where a light source dedicated to nightlights is used. On the other hand, in such a case, there is a problem that the configuration of the lighting circuit and the like is complicated because the lighting circuit needs to cope with a very wide range of brightness.

  The plurality of light sources 114A to 114C emit light in different directions. As described above, in a configuration in which the emission directions (emission angles) of the plurality of light sources 114A to 114C are different, the brightness perceived by the user differs according to the positional relationship between the light source to be lit and the user. For example, when the user is sleeping, when the light source on the opposite side of the user is lit, the user feels darker than when the light source on the user side is lit. Thereby, even if the lower limit value of the brightness that can be handled by the lighting circuit is the same, dark information can be provided to the user. As a result, since the lower limit value of the brightness corresponding to the lighting circuit can be increased, the complexity of the lighting circuit can be reduced.

  1 to 4, each of the plurality of light sources 114A to 114C includes a light guide plate 20a, 20b, or 20c and a light emitting element 72B that emits light to the light guide plate 20a, 20b, or 20c. . Specifically, the luminaire 10 is disposed between each of a plurality of elongated light emitting devices 70a to 70c arranged side by side in the circumferential direction and two light emitting devices adjacent in the circumferential direction. Light guide plates 20a to 20c. Each of the plurality of light emitting devices 70a to 70c is arranged so that the longitudinal direction thereof is along the radial direction, and the light emitting element 72B emits light to one of the two light guide plates sandwiching the light emitting device in the circumferential direction; A light emitting element 72B for emitting light to the other of the two light guide plates. For example, as illustrated in FIGS. 1 to 4, the light emitting device 70a is disposed on the light guide plate 20a side, and is disposed on the light guide plate 20b side with a plurality of light emitting elements 72B that emit light to the light guide plate 20a. And a plurality of light emitting elements 72B for emitting light to the light guide plate 20b. Each of the plurality of light sources 114A to 114C includes a corresponding light guide plate and a light emitting element 72B that emits light to the light guide plate. For example, the light source 114A includes a light guide plate 20a, a plurality of light emitting elements 72B disposed on the light guide plate 20a side of the light emitting device 70a, and a plurality of light emitting elements 72B disposed on the light guide plate 20a side of the light emitting device 70b. .

  In such a configuration, since the light is emitted from the light emitting element 72B in the horizontal direction, the brightness change felt by the user according to the position of the light source to be turned on becomes more remarkable. Therefore, by applying the present invention to such a configuration, the brightness felt by the user can be further controlled.

(Modification)
In the above description, an example in which the operation unit 101 includes a plurality of operation buttons has been described. However, the operation unit 101 may include a touch panel or the like, or voice input or the like may be used. In addition, the operation unit 101 is not limited to a remote controller dedicated to the lighting fixture 10 and may be a smartphone or the like.

  Moreover, the lighting fixture 10 may have functions other than the function demonstrated above, such as a timer function, for example.

  Moreover, in the said description, although the lighting fixture 10 is provided with the light source (light source 113) which irradiates white light, it does not need to be provided. Moreover, the lighting fixture 10 may include a plurality of light sources that emit white light, and may have a function of lighting only a part of the light source of white light, similarly to the light sources 114A to 114C.

  In the above description, the case where the number of light sources used at nightlight is three has been described, but the number of light sources may be two or more.

  In the above description, an example in which only one light source is turned on during night lighting is described. However, only some of the light sources used during normal lighting need be turned on. For example, as shown in FIG. 10, two light sources may be turned on during night light.

(Embodiment 2)
In the first embodiment, the example in which the same light source is used during normal lighting and during nightlight lighting has been described. In the present embodiment, a lighting apparatus including a light source dedicated to a nightlight will be described.

  FIG. 11 is a diagram illustrating a configuration of a lighting fixture 10A according to the present embodiment. FIG. 12 is a block diagram of a lighting fixture 10A according to the present embodiment.

  11A and 12B includes a power supply circuit 120, lighting circuits 121A to 121C, and light sources 122A to 122C in addition to the configuration of the lighting apparatus 10 according to the first embodiment.

  The light sources 122A to 122C are turned on during night light and have a series circuit of one or a plurality of light emitting elements 72C. For example, as illustrated in FIG. 11, the light sources 122 </ b> A to 122 </ b> C are provided on the side surface of the first instrument body 40. Note that the positions where the light sources 122A to 122C are provided are merely examples, and may be provided at arbitrary positions.

  In the first embodiment, the light sources 114A to 114C are used both during normal lighting and during night light. In the present embodiment, the light sources 114A to 114C are used only during normal lighting.

  The power supply circuit 120 converts an AC voltage supplied from a commercial AC power supply 102 into a DC voltage V2. This DC voltage V2 is supplied to the lighting circuits 121A to 121C. This DC voltage is also supplied to an analog circuit (not shown) in the lighting fixture 10A.

  The lighting circuits 121A to 121C have switching power supply circuits that step down the DC voltage V2 output from the power supply circuit 120 to a DC voltage having a desired voltage value (drive voltage of the light sources 122A to 122C).

  FIG. 13 is a circuit diagram showing the configuration of the lighting circuit 121A and the light source 122A. Note that the configurations of the lighting circuits 121B and 121C and the light sources 122B and 122C are the same as the configurations of the lighting circuit 121A and the light source 122A.

  The lighting circuit 121A includes switching elements Q2 and Q3, resistors R4 to R6, a diode D1, and a capacitor C2.

  The cathode of the diode D2 is connected to the positive output terminal of the power supply circuit 120 via the resistor R6. A switching element Q3 is connected between the anode of the diode D2 and the negative output terminal (GND) of the power supply circuit 120.

  A plurality of light emitting elements 72C of the light source 122A are connected in series between the cathode and the anode of the diode D2. Although two light emitting elements 72C are illustrated in FIG. 13, the number of light emitting elements 72C may be arbitrary.

  A capacitor C2 and a resistor R5 are connected in parallel between the negative output terminal (GND) of the power supply circuit 120 and the base of the switching element Q3. The base of the switching element Q3 is connected to the switching element Q2 via the resistor R4. Further, the control signal S5 from the control unit 116 and the voltage V3 are applied to the switching element Q2. Here, the voltage V3 is, for example, a voltage used as a power source for the control unit 116, and is a voltage lower than the voltage V2.

  Also, different control signals S5 to S7 are input from the control unit 116 to each of the lighting circuits 121A to 121C. Thereby, each of lighting circuit 121A-121C is controlled independently, and each of light source 122A-122C is controlled independently.

  In the present embodiment, in the nightlight mode, only one light source among the light sources 122A to 122C is turned on. In addition, it is possible to switch which light source among the light sources 122A to 122C is turned on. Also, the brightness of the light source can be adjusted even in the nightlight mode.

  As described above, the lighting fixture 10A according to the present embodiment has a function of switching the light source that is turned on at nightlight. Thereby, 10 A of lighting fixtures can light a nightlight appropriately, and can improve a user's convenience.

  Compared to Embodiment 1, the lighting fixture 10A has an advantage that the lighting circuit can be easily designed because the lighting fixture 10A includes a light source dedicated to the nightlight. On the other hand, the luminaire 10 according to Embodiment 1 has an advantage that the number of light sources can be reduced by using the same light source during normal lighting and during night lighting.

  In addition, although the case where the number of the light sources used at the time of nightlight is three was demonstrated here, the number of the light sources should just be two or more. Further, the number of light sources used during night light and the number of light sources used during normal lighting may be the same or different. For example, only one light source may be used during normal lighting.

  In the above embodiment, an example in which the present invention is realized as a ceiling light has been described. However, the present invention may be applied to other lighting fixtures other than the ceiling light. That is, the said embodiment is applicable to a lighting fixture provided with the some light source used at the time of nightlight.

  In the above embodiment, an example in which a so-called SMD type light emitting module is used has been described, but the mode of the light emitting element is not particularly limited. For example, a COB (Chip On Board) type light emitting module may be used. Moreover, solid light emitting elements other than LED, such as an organic EL element (OLED) or an inorganic EL element, may be used.

  As mentioned above, although the lighting fixture which concerns on one or several aspects was demonstrated based on embodiment, this invention is not limited to this embodiment. Unless it deviates from the gist of the present invention, various modifications conceived by those skilled in the art have been made in this embodiment, and forms constructed by combining components in different embodiments are also within the scope of one or more aspects. May be included.

DESCRIPTION OF SYMBOLS 10 Lighting fixture 20a, 20b, 20c Light-guide plate 72B Light emitting element 114A, 114B, 114C Light source 115 Reception part 116 Control part

Claims (5)

A luminaire comprising a plurality of light sources,
A reception unit that accepts an instruction to turn on the nightlight,
When the reception unit receives an instruction to turn on the nightlight, a control unit that turns on only some of the light sources as the nightlight,
The reception unit further receives a switching instruction of a light source that is turned on as the nightlight,
The control unit further switches, when the receiving unit receives the switching instruction, among the plurality of light sources, the partial light source that is turned on as the nightlight. The reception unit further receives a dimming instruction,
The control unit further includes:
When the reception unit receives the dimming instruction, the brightness of the part of the light sources that is turned on as the nightlight is switched,
When the reception unit receives the switching instruction after switching the brightness, among the plurality of light sources, the partial light source that is lit as the nightlight is switched, and the switching unit is switched according to the switching instruction. The lighting fixture according to claim 1, wherein some of the light sources are turned on with brightness after switching according to the dimming instruction. The controller is
During normal lighting, a part or all of the plurality of light sources is turned on at a first brightness,
The lighting apparatus according to claim 1 or 2, wherein the partial light source is turned on at a second brightness darker than the first brightness as the night light. The lighting fixture according to any one of claims 1 to 3, wherein the plurality of light sources irradiate light in different directions. Each of these light sources contains a light guide plate and the light emitting element which radiate | emits light to the said light guide plate. The lighting fixture of any one of Claims 1-4.

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