JP6074292B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device.

  Usually, in the lighting device, white light is used like an incandescent bulb or a fluorescent lamp. In an illuminating device using an LED (Light Emitting Diode) as a light source, it is common to produce white light by converting ultraviolet light or blue light from an LED into yellow light by a phosphor and mixing it with the original light. . On the other hand, there is an illumination device that is used for creating an atmosphere using LEDs that emit light other than white, such as red, green, or blue, as they are.

  For example, the LED decorative lighting fixture disclosed in Japanese Patent Application Laid-Open No. 2010-159592 (patent document 1) activates the user's mood by shortening the blinking period of light, or healing by increasing the blinking period of light. You can create an atmosphere. Moreover, the lighting fixture using LED which Unexamined-Japanese-Patent No. 2001-76515 (patent document 2) discloses various patterns which light by projecting the various light irradiated from LED to a to-be-photographed object. In such an illuminating device, light of a plurality of colors is emitted while being sequentially changed, and a pattern is generated on the irradiation surface by the light of the plurality of colors.

JP 2010-159592 A JP 2001-76515 A

  However, the interior decoration lighting devices disclosed in Patent Documents 1 and 2 are only for the purpose of creating an atmosphere, and do not have a sufficient amount of light for meals or reading. If the light quantity of these lighting devices is simply increased, glare may occur indirectly as uneven illuminance on the wall surface, for example.

  In addition, the lighting device that is always lit in a chromatic color other than white includes, for example, a lighting device using a single high-intensity blue LED used inside an aquarium tank, and a lighting device used to create an atmosphere in a hall or restaurant. and so on. However, when a chromatic LED other than white is used, the color of the object appears to be significantly different from that of a white LED. Therefore, these lighting devices are also not suitable for use in daily life such as illuminating the entire room in a living room.

  The objective of this invention is providing the illuminating device suitable for use in daily life while being able to produce aesthetics.

  According to an aspect of the present invention, the lighting device has a rotationally symmetric outer shape. The lighting device includes a light source unit, a reflecting surface, a cover, and a control circuit. The light source unit includes a plurality of light sources disposed rotationally symmetrically with respect to the central axis of the lighting device, and each of the plurality of light sources is provided so as to emit light in a direction substantially parallel to a plane orthogonal to the central axis. It is done. The reflecting surface has a rotationally symmetric shape and is provided so as to reflect light emitted in a substantially parallel direction. The control circuit turns on the plurality of light sources. The cover covers the plurality of light sources and diffuses light emitted from a light source that is lit among the plurality of light sources and light from the reflection surface. The plurality of light sources includes first and second light source groups. The first light source group is turned on in the first illumination mode in which illumination is performed with white light under the control of the control circuit. The second light source group is a second illumination mode in which at least one of the color distribution and the luminance distribution in the cover of the light emitted from the corresponding light source among the plurality of light sources is non-uniform under the control of the control circuit. Lights on.

  Preferably, the plurality of light sources further includes a third light source group. A light source belonging to the third light source group among the plurality of light sources is a third illumination mode in which at least one of the color distribution and the luminance distribution in the cover is not uniform in the outer peripheral direction of the illumination device under the control of the control circuit. Lights on.

  Preferably, in the first illumination mode, the first light source group emits light so that the color distribution and the luminance distribution in the cover are uniform.

  Preferably, the lighting device further includes an operation unit that receives an operation by a user for selecting a desired lighting mode from the first and second lighting modes. The operation unit outputs a signal for instructing the control circuit to select the illumination mode selected by the user to the control circuit.

  Preferably, the light source unit includes a plurality of small substrates on each of which a corresponding light source among the plurality of light sources is arranged. The plurality of small substrates are annularly arranged around the central axis of the lighting device.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to produce aesthetics, the illuminating device suitable for use in daily life is realizable.

It is an external appearance perspective view which shows typically the external appearance of the illuminating device which concerns on Embodiment 1 of this invention. It is a perspective view for demonstrating the light source board | substrate unit shown in FIG. It is a functional block diagram which shows the outline of the circuit structure of the illuminating device shown in FIG. It is a circuit diagram for demonstrating the outline of the circuit structure of the light source board | substrate shown in FIG. It is a top view for demonstrating arrangement | positioning of the light source in the light source board | substrate shown in FIG. It is a figure for demonstrating how the light from each light source spreads in the light source board | substrate shown in FIG. It is a figure for demonstrating how the light from the light source spreads in the illuminating device shown in FIG. In the illuminating device shown in FIG. 1, it is a figure which shows typically the mode of the cover in which the light source is lighting. It is a top view which shows typically the mode of the light source board | substrate in the illuminating device which concerns on Embodiment 2 of this invention, and the cover in which the light source is lighting. It is a top view which shows typically the mode of the light source board | substrate in the illuminating device which concerns on the modification 1 of Embodiment 2 of this invention, and the cover in which the light source is lighting. It is a top view which shows typically the mode of the light source board | substrate in the illuminating device which concerns on the modification 2 of Embodiment 2 of this invention, and the cover in which the light source is lighting. It is a top view which shows typically the mode of the light source board | substrate in the illuminating device which concerns on Embodiment 3 of this invention, and the cover in which the light source is lighting. It is a top view which shows typically the mode of the light source board | substrate in the illuminating device which concerns on Embodiment 4 of this invention, and the cover in which the light source is lighting. It is the figure which looked at a part of light source unit shown in FIG. 2 along the central axis.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated.

  In the embodiment described below, the lighting device according to the embodiment of the present invention is a ceiling light. However, the illumination device according to the embodiment of the present invention is not limited to a ceiling light, and may be a pendant light, for example. Moreover, the illuminating device which concerns on embodiment of this invention may be attached to a side wall, for example, and may irradiate light in a horizontal direction.

  In the present specification, when the surface of the cover is divided into a plurality of unit regions, when a color deviation greater than a reference value is included between the regions (for example, when the distance on the chromaticity diagram is a predetermined value or more) ), The light color distribution in the cover is defined as "non-uniform". Similarly, it is defined that the luminance distribution of light in the cover is “non-uniform” when a luminance deviation equal to or greater than the reference value is included between the above-described regions. On the other hand, when the color and luminance deviations between the regions are less than the respective reference values, the color distribution and luminance distribution of the light in the cover are defined as “uniform”. When at least one of the light color distribution and the luminance distribution in the cover is “non-uniform”, a pattern appears on the cover. Even if the cover pattern has periodicity, it is included in “non-uniform”.

[Embodiment 1]
FIG. 1 is an external perspective view schematically showing the external appearance of a ceiling light according to Embodiment 1 of the present invention. FIG. 2 is a perspective view for explaining the light source unit shown in FIG. 1 and 2, a ceiling light (illumination device) 100 includes a main body 1 attached to an indoor ceiling surface and a remote controller 1a. The main body 1 includes a frame 4, a reflection sheet 41, a cover 3, a light source unit 2 a, and a circuit board 5.

  The frame 4 is a circular sheet metal. At the center of the frame 4, a light source unit 2a is provided. In the light source unit 2a, eight light source substrates 2 are arranged around the central axis c of the frame 4 so as to form a regular octagon. A plurality of LEDs (Light Emitting Diodes) (light sources) are arranged on the light source substrate 2. These LEDs include an LED group described later. Each LED emits light in a direction substantially parallel to a plane P orthogonal to the central axis c. More specifically, each LED radiates light radially outward from the central axis c. A heat radiating plate (heat sink) 17 is provided on the back surface of each light source substrate 2 for LED heat dissipation measures. The light source substrate 2 is coated with a highly reflective material (for example, a white resist) in order to reduce light loss.

  A reflection sheet 41 is provided on the surface of the frame 4 on the side where the light source unit 2a is provided. The reflection sheet 41 has a shape (circular in this embodiment) that is rotationally symmetric with respect to the central axis c. The reflective sheet 41 corresponds to a “reflective surface” according to the present invention.

  The circuit board 5 is disposed inside the light source unit 2a. The arrangement of the LEDs on the light source board 2 and the method for controlling the light source board 2 by the circuit board 5 will be described in detail later.

  The shape of the cover 3 is slightly larger than the frame 4 but is a circle having substantially the same dimensions. The cover 3 is fitted and held on the peripheral edge of the frame 4 to cover the entire lower surface of the main body 1. As the material of the cover 3, for example, a resin having light diffusibility is used. As the cover 3 diffuses light, the light emitted from the LEDs and the light reflected by the reflection sheet 41 are not directly irradiated onto the floor surface. Therefore, when the user faces the ceiling surface and directly views the ceiling light 100, the light from the LED and the light reflected by the reflection sheet 41 are prevented from being directly inserted into the user's eyes. As a result, glare is reduced, and the burden on the eyes of the user can be suppressed.

  FIG. 3 is a functional block diagram showing an outline of a circuit configuration of the ceiling light 100 shown in FIG. Referring to FIG. 3, circuit board 5 includes power connector 16, power supply circuit 10, voltage conversion circuit 14, CPU 11, memory 12, PWM (Pulse Width Modulation) control circuit 13, and receiver 15. including. The LED group 7 arranged in the light source unit 2a is classified into two types of LED groups 7a (first light source group) and LED group 7b (second light source group) according to the position or emission color.

  The power connector 16 is provided, for example, near the center of the frame 4 (see FIG. 1). The power supply circuit 10 receives AC power from an external power source (not shown) (for example, AC 100 V commercial power source) via the power connector 16. The power supply circuit 10 converts AC power into DC power, and supplies the DC power to the light source substrate 2 and the voltage conversion circuit 14. The voltage conversion circuit 14 is a regulator, for example, and converts a DC voltage from the power supply circuit 10 into an operating voltage of the CPU 11. In FIG. 3, the power supply circuit 10 is illustrated as being connected only to the voltage conversion circuit 14 and the light source substrate 2. However, the connection destination of the power supply circuit 10 is not limited to these, and necessary power is supplied from the power supply circuit 10 to other components.

  The main body 1 (see FIG. 1) has a dimming function and a toning function, and has a plurality of illumination modes for switching indoor colors and brightness. A user (not shown) operates the remote controller 1a to select a desired illumination mode. The remote controller 1a receives an operation by the user, and outputs a signal to the circuit board 5 instructing the circuit board 5 to select the illumination mode selected by the user. The receiving unit 15 receives a signal from the remote controller 1a. The remote controller 1a is an example of the “operation unit” according to the present invention. A wired switch or the like may be provided instead of the remote controller 1a.

  The CPU 11 controls the ceiling light 100 as a whole based on the signal from the receiving unit 15. The memory 12 stores various programs for controlling the ceiling light 100, initial values, and the like. The memory 12 is also used as a working memory for the CPU 11. The PWM control circuit 13 generates PWM signals M1 and M2 for driving the LED group 7 in accordance with an instruction from the CPU 11. The circuit board 5 is an example of the “control circuit” according to the present invention. The CPU 11, the memory 12, and the PWM control circuit 13 may be configured by a microcomputer.

  Each light source substrate 2 is provided with LEDs belonging to the LED groups 7a and 7b, and N-channel FETs (Field Effect Transistors) 21 and 22 for driving the LEDs. For the sake of simplicity, FIG. 4 shows two LEDs belonging to the LED groups 7a and 7b. The FETs 21 and 22 are driven by PWM signals M1 and M2 from the PWM control circuit 13, respectively.

  More specifically, FIG. 4 is a circuit diagram for explaining an outline of the circuit configuration of the light source substrate 2 shown in FIG. Referring to FIG. 4, the LEDs belonging to LED groups 7a and 7b are connected in series so that the anode faces the power supply circuit 10 side and the cathode faces the drain sides of FETs 21 and 22, respectively. The sources of the FETs 21 and 22 are both electrically connected to the ground potential GND. The gates of the FETs 21 and 22 are electrically connected to the PWM control circuit 13. The FETs 21 and 22 are switched between a conductive state and a non-conductive state in response to the PWM signals M1 and M2, respectively. Thereby, the supply of current to the LED groups 7a and 7b on each light source substrate 2 is controlled. The FETs 21 and 22 may be provided inside the PWM control circuit 13.

  FIG. 5 is a plan view for explaining the arrangement of the LEDs on the light source substrate 2 shown in FIG. Referring to FIG. 5, LEDs belonging to LED groups 7 a and 7 b are arranged on each light source substrate 2. The light emission color of the LED group 7a is, for example, a light bulb color, and the light emission color of the LED group 7b is, for example, light purple or pink. In the LED group 7a of each light source substrate 2, eight LEDs are arranged at regular intervals and densely. In the LED group 7b, the six LEDs are arranged so as not to be equally spaced. More specifically, three LEDs are arranged on the left side and the right side in the drawing. The distance Db between the three LEDs on the left and right is wider than the distance Da between the LEDs of the LED group 7a. Due to this distance Db, in the light source unit 2a, the arrangement of the LEDs is biased in the circumferential direction of the cover 3.

  The LEDs belonging to the LED groups 7a and 7b are an example of the “light source” according to the present invention. As described in detail later, the “light source” according to the present invention needs to have directivity. LEDs have directivity and are available in abundant colors. For example, as a white LED for a lighting device, an LED having a color temperature of about 3,000 K to 8,000 K is currently available. In the chromatic LED, a plurality of colors including the three primary colors of light (red, green, and blue) are arranged. Therefore, it is preferable to use an LED as a light source.

  The LED group 7a emits light in white (for example, light bulb color) close to black body radiation. The LED group 7b emits light in a chromatic color (other than white), for example, purple or pink. “White color close to black body radiation” means that the correlated color temperature is 2,500 K to 10,000 K based on JIS-C8155 “General lighting LED module—Performance requirement” (3.2 “Lighting white color”). LED ”), and the deviation (duv) from the black body locus is within ± 0.01 (described in 7.3.3“ Light source color and color rendering ”column). The illumination colors (daylight color, daylight white, light bulb color, etc.) that have been often used for incandescent bulbs or fluorescent lamps are all “white near blackbody radiation”. For this reason, this color is familiar to the user and is less uncomfortable. Sunlight is also “white near blackbody radiation”. Therefore, when the user goes indoors (under the ceiling light 100) and outdoors (under sunlight), the change in the appearance of the color of the object is reduced.

  FIG. 6 is a diagram for explaining how light from each LED on the light source substrate 2 shown in FIG. 5 spreads. Referring to FIG. 6, FIG. 6 is a side view of the light source substrate 2. The region 71a indicates a range (light distribution) in which the luminous flux of light emitted from one LED belonging to the LED group 7a is equal to or greater than a predetermined reference value. Most of the light from each LED on the light source substrate 2 is irradiated in front of the LED (a direction parallel to the plane P perpendicular to the central axis c). Therefore, the front of the LED group 7a is brightened, but the periphery thereof is not brightened.

  FIG. 7 is a diagram for explaining how light from the LEDs spreads in the ceiling light 100 shown in FIG. Referring to FIG. 7, the light from the LEDs on light source substrate 2 includes light that directly enters cover 3 and light that is once diffusely reflected by reflection sheet 41 and then incident on cover 3. The number of reflections is not limited to one, and reflection is repeated between the reflection sheet 41 and the cover 3. Due to such multiple reflection, light spreads inside the ceiling light 100. The light that has spread inside the ceiling light 100 is diffused by the cover 3.

  As described above, how the light from the LED spreads differs depending on the light distribution of the LED determined by the shape of the lens provided on the front surface of the LED and the structure of the ceiling light 100 (for example, the shape of the cover 3 and the reflection sheet 41). . Therefore, when disposing the LED groups 7a and 7b on the light source substrate 2, it is necessary to consider the spread of light emitted from the LED groups 7a and 7b.

  The ceiling light 100 has three illumination modes. The three illumination modes are illumination mode 1 (first illumination mode), illumination mode 2 (second illumination mode), and full lamp mode. Hereinafter, the state of the cover 3 in each illumination mode will be described in detail.

  FIG. 8 is a diagram schematically illustrating the state of the cover 3 in which the LED is lit in the ceiling light 100 illustrated in FIG. 1. Referring to FIG. 8, FIG. 8A shows the state of the cover 3 in the illumination mode 1 (first illumination mode). A point where the central axis c intersects the frame 4 is represented by a center O. In the illumination mode 1, only the LED group 7a is lit. In the LED group 7a, LEDs are arranged densely at equal intervals. For this reason, the light from the LED group 7a is repeatedly reflected between the reflection sheet 41 and the cover 3 in the ceiling light 100 and diffused by the cover 3, whereby the color distribution in the region 3a of the cover 3 and The luminance distribution becomes uniform. As a result, the illuminance distribution on the irradiated surface is also uniform. Therefore, the illumination mode 1 is suitable for use in daily life.

  FIG. 8B shows a state of the cover 3 in the illumination mode 2 (second illumination mode). In the illumination mode 2, only the LED group 7b is lit. In the LED group 7b, there is a place where an interval between the LEDs is spaced. For this reason, the light emitted from the LED and the light reflected by the reflection sheet 41 are also spaced apart, and the cover 3 has a non-uniform luminance distribution. As a result, the pattern 3 b appears on the cover 3. More specifically, the pattern 3b has a shape in which a heart shape is combined. As described above, in the illumination mode 2, the appearance can be generated by the pattern 3b appearing on the cover 3. Therefore, the illumination mode 2 is suitable for creating an indoor atmosphere.

  On the other hand, the light from the LED group 7 b is repeatedly reflected between the reflection sheet 41 and the cover 3 inside the ceiling light 100 and is appropriately diffused by the cover 3. Thereby, glare is reduced. Furthermore, light also spreads radially from the ceiling light 100 outside the ceiling light 100. This light is reflected by, for example, a ceiling surface, a wall surface, or an indoor installation (furniture, etc.), and is mixed before reaching the floor surface. Therefore, even if a pattern appears on the cover 3, unevenness in illuminance on the floor surface is hardly noticed.

  FIG. 8C shows the state of the cover 3 in the all-light mode. In the all-light mode, both the LED groups 7a and 7b are lit. As described above, the light emission color of the LED group 7a is, for example, a light bulb color, and the light emission color of the LED group 7b is, for example, light purple or pink. When these colors are represented on the chromaticity diagram, the distance between the two points is a predetermined value or more. For this reason, the color distribution of the cover 3 becomes non-uniform. As a result, the pattern 3 b appears on the cover 3. Further, when these colors are mixed, a color like sunset is obtained on the irradiated surface. Thus, by appropriately adjusting the colors of the LED groups 7a and 7b, it is possible to realize a lighting device in which white and chromatic colors are mixed and an atmosphere different from that of an incandescent bulb or a fluorescent lamp. Further, as in the description with reference to FIG. 8B, glare is reduced, and uneven illumination on the floor surface is hardly noticed.

  As described above, the ceiling light 100 according to Embodiment 1 includes the illumination mode 1 in which the color distribution and the luminance distribution in the cover 3 are uniform, the illumination mode 2 in which the pattern 3b appears on the cover 3, and the all-light mode. . When it is desired to reduce glare as much as possible, or when it is desired to make the illuminance distribution on the irradiated surface as uniform as possible, the user can select the illumination mode 1. On the other hand, when it is desired to enhance the beauty of the ceiling light 100 for the purpose of creating an indoor atmosphere, the user can select the illumination mode 2 or the all-light mode. Also in the illumination mode 2 and the all-light mode, the glare is reduced and the uneven illumination on the floor surface is hardly noticed. According to the ceiling light 100 according to the first embodiment, both of the above applications can be used.

  In addition, the light emission color of said LED group 7a, 7b is an example, Comprising: The light emission color of LED group 7a, 7b is not limited to this. It is important that the color of the region 3a is different from the color of the pattern 3b. For example, when the LED group 7a emits light in daylight and the LED group 7b emits blue light, the room is a little bluish white as in a hospital.

  Even when the LED groups 7a and 7b have the same emission color, the luminance distribution of the cover 3 becomes non-uniform by making the light emission amounts (for example, light fluxes) of the LED groups 7a and 7b different from each other. As a result, a pattern appears on the cover 3. By controlling the duty ratio of the PWM signals M1 and M2 (see FIG. 4), the currents flowing through the LED groups 7a and 7b are adjusted. Thereby, the darkness of the pattern 3b appearing on the cover 3 or the contrast between the region 3a and the pattern 3b can be changed.

  In order to make the pattern 3b appear on the cover 3, a plurality of types of light source substrates may be used. However, considering the manufacturing process, it is preferable to use one type of light source substrate from the viewpoint of reducing the number of members and the number of man-hours. Further, if there is only one type of light source substrate, the optical characteristics such as light diffusion and reflection are also common. Therefore, it is convenient that the lighting device can be configured in a shape having good symmetry such as a circle or a regular polygon. When the illuminating device is a circle or a regular polygon, the deviation in the circumferential direction (or the outer circumferential direction) of light radially spreading from the illuminating device can be suppressed. Accordingly, it is possible to realize an illumination device that is less uneven in illumination on the irradiation surface and suitable for daily life.

  It has been described that the shape of the light source unit 2a is a regular octagon. However, the shape of the light source unit is not limited to this. The shape of the light source unit can be appropriately changed according to the size of the ceiling light (or the outer shape of the ceiling light). However, the shape of the light source unit is preferably a regular n square (n is a natural number of 4 or more). Thereby, only one type of light source substrate is required. Further, the distribution of the irradiation light reaching the floor surface can be made substantially uniform in at least four directions around the ceiling light.

  Similarly, the shape of the reflection sheet 41 is preferably a shape that is rotationally symmetric with respect to the center of the ceiling light such as a circular shape and a regular n-gonal shape. When the reflection sheet 41 is a circle or a regular n-gon, the deviation in the circumferential direction (or outer circumferential direction) of the reflected light by the reflection sheet 41 is suppressed. Therefore, similarly to the situation in the light source substrate 2 or the light source unit 2a described above, an illumination device suitable for daily life can be realized with less uneven illuminance on the irradiation surface.

[Embodiment 2]
By adjusting the arrangement of the LEDs, the pattern appearing on the cover can be variously changed.

  FIG. 9 is a plan view schematically showing the state of the light source substrate and the cover 3 in which the LED is lit in the ceiling light according to Embodiment 2 of the present invention. Referring to FIG. 9A, LED groups 7a (first light source group) and LEDs belonging to LED group 7b (second light source group) are arranged on each light source substrate 202. The arrangement of the LED group 7a is the same as the arrangement of the LED group 7a in the first embodiment. The LEDs belonging to the LED group 7b on each light source substrate 202 are arranged between two LEDs belonging to the LED group 7a (as an example, between the second LED and the third LED from the left in the figure). At the center O of the frame 4, a light source unit 202a is provided in which eight light source substrates 202 are arranged in a regular octagon. The rest of the configuration of the ceiling light according to the second embodiment is the same as the configuration of the ceiling light 100 (see FIG. 1) according to the first embodiment, and thus detailed description will not be repeated.

  Since the state of the cover 3 in the illumination mode 1 is the same as that of Embodiment 1 (see FIG. 8A), detailed description will not be repeated. On the other hand, FIG. 9B shows a state of the cover 3 in the illumination mode 2. In the cover 3, a flower-like pattern 31b appears corresponding to the position of the LED group 7b. Thereby, the aesthetics different from Embodiment 1 can be produced.

[Modification 1]
FIG. 10 is a plan view schematically showing a state of the light source substrate and the cover 3 in which the LED is lit in the ceiling light according to the first modification of the second embodiment of the present invention. Referring to FIG. 10, FIG. 10 is compared with FIG. In the first modification of the second embodiment, two LEDs on each light source substrate 203 belong to the LED group 7b. At the center O of the frame 4, a light source unit 203a is provided in which eight light source substrates 203 are arranged in a regular octagon.

  FIG. 10B shows a state of the cover 3 in the illumination mode 2. Compared with the second embodiment, the number of petals of the flower pattern 32b appearing on the cover 3 is increased. Thereby, an aesthetics different from that of the second embodiment can be generated.

[Modification 2]
FIG. 11 is a plan view schematically showing a state of the light source substrate and the cover 3 in which the LED is lit in the ceiling light according to the second modification of the second embodiment of the present invention. Referring to FIG. 11, FIG. 11 is compared with FIG. 9 and FIG. In the second modification of the second embodiment, three LEDs on each light source substrate 204 belong to the LED group 7b. At the center O of the frame 4, a light source unit 204a is provided in which eight light source substrates 204 are arranged in a regular octagon.

  FIG. 11B shows a state of the cover 3 in the illumination mode 2. Compared to the first modification of the second embodiment, the number of petals of the flower pattern 33b appearing on the cover 3 is further increased. Thereby, the aesthetics different from Embodiment 2 and its modification 1 can be produced.

[Embodiment 3]
FIG. 12 is a plan view schematically showing the state of the light source substrate and the cover 3 in which the LED is lit in the ceiling light according to Embodiment 3 of the present invention. Referring to FIG. 12, FIG. 12 (A) shows the arrangement of LEDs on light source substrate 205 in the ceiling light according to the third embodiment. Nine LEDs are arranged at equal intervals D on each light source substrate 205. Each of these LEDs is classified into three groups (LED groups 8a to 8c). The LED groups 8a to 8c can emit light independently of each other. The light emission colors of the LEDs of the LED groups 8a to 8c are the same, for example, white that is close to black body radiation. At the center O of the frame 4, a light source unit 205a is provided in which eight light source substrates 205 are arranged in a regular octagon. The rest of the configuration of the ceiling light according to the third embodiment is the same as the configuration of the ceiling light 100 (see FIG. 1) according to the first embodiment, and thus detailed description will not be repeated.

  FIGS. 12B to 12D show the state of the cover 3 in which the LED groups 8a to 8c are respectively lit. In FIG. 12B, only the LED group 8a is lit, in FIG. 12C only the LED group 8b is lit, and in FIG. 12D only the LED group 8c is lit. When each of the LED groups 8a to 8c is lit alone, the arrangement of the LEDs being lit in the circumferential direction of the cover 3 becomes uneven. Thereby, the positions where the flower patterns 34a to 34c appear change corresponding to the LED groups 8a to 8c, respectively.

  FIG. 12E shows the state of the cover 3 in which all of the LED groups 8a to 8c are lit. When all of the LED groups 8 a to 8 c are turned on, the arrangement of the LEDs that are turned on is equal in the circumferential direction of the cover 3. Therefore, the flower pattern does not appear on the cover 3. In this way, it is possible to select whether or not a pattern appears on the cover 3 by switching the LED group to be lit. Furthermore, when a pattern appears on the cover 3, the position of the pattern (or the shape of the pattern) can be changed according to the LED group to be lit.

  In the third embodiment, the LED groups 8a to 8c collectively correspond to the “first light source group” according to the present invention, and one of the LED groups 8a to 8c corresponds to the “second light source group” according to the present invention. Corresponding to the “light source group”, the other one of the LED groups 8a to 8c corresponds to the “third light source group”. Accordingly, the case shown in FIG. 12 (E) corresponds to the “first illumination mode” according to the present invention, and any one of the cases shown in FIGS. 12 (B) to (D) corresponds to the “first illumination mode” according to the present invention. Corresponding to the “second illumination mode”, any one of the other cases shown in FIGS. 12B to 12D corresponds to the “third illumination mode” according to the present invention.

[Embodiment 4]
In Embodiments 1 to 3, the LED groups 7a and 8a to 8c emit white light. However, in the embodiment of the present invention, it is not essential that the LED group that emits white light is included in the plurality of LED groups on the light source unit.

  FIG. 13 is a plan view schematically showing the state of the light source substrate and the cover 3 in which the LED is lit in the ceiling light according to Embodiment 4 of the present invention. Referring to FIG. 13, FIG. 13 (A) shows the arrangement of LED groups 9r, 9g, 9b on light source substrate 206 in the ceiling light according to the fourth embodiment. The arrangement of LED groups 9r, 9g, and 9b on light source substrate 206 is the same as the arrangement of LED groups 8a to 8c on light source substrate 205 in the third embodiment. However, the emission colors of the LED groups 9r, 9g, and 9b are different. More specifically, the LED group 9r emits red light, the LED group 9g emits green light, and the LED group 9b emits blue light. At the center O of the frame 4, a light source unit 206a is provided in which eight light source substrates 206 are arranged in a regular octagon. The rest of the configuration of the ceiling light according to the fourth embodiment is the same as the configuration of the ceiling light 100 (see FIG. 1) according to the first embodiment, and thus detailed description will not be repeated.

  FIGS. 13B to 13D show the state of the cover 3 when the LED groups 9r, 9g, and 9b are respectively lit. When each of the LED groups 9r, 9g, and 9b is lit alone, the luminance distribution in the cover 3 becomes non-uniform. Thereby, patterns 35r, 35g, and 35b that are red, green, and blue appear at positions corresponding to the LED groups that are lit.

  FIG. 13E shows the state of the cover 3 in which all of the LED groups 9r, 9g, and 9b are turned on. In the cover 3, red, green, and blue are periodically unevenly distributed in the circumferential direction of the cover 3, and the color distribution in the cover 3 becomes uneven. Therefore, patterns 35r, 35g, and 35b appear on the cover 3, and a color pattern in which these colors are mixed appears. Thereby, an aesthetics can be produced. On the other hand, the color of the irradiated surface is white by mixing red, green, and blue light. Thus, even if the LED group does not emit white light, it is possible to illuminate white light. Therefore, it is possible to realize an illumination device suitable for use in daily life, for example, lighting the entire room in a living room.

  FIG. 14 is a view of a part of the light source unit 2a shown in FIG. 2 as viewed along the central axis c. Referring to FIG. 14, in FIG. 14, only the LED group 7a is illustrated among the LED groups 7a and 7b. As described in FIG. 5, on each light source substrate 2, the LEDs belonging to the LED group 7a are arranged at equal intervals with an interval Da. The distance between the LED arranged at the right end of the light source substrate 2 on the left side in the drawing and the LED arranged at the left end of the light source substrate 2 on the right side in the drawing is Dc.

  In this specification, the case where the LEDs are arranged “equally” includes a case where the LEDs are all arranged at equal intervals (that is, a case where Dc is equal to Da), but is not limited thereto. In the present specification, when the distance Dc between adjacent LEDs arranged on different light source substrates 2 is different from the distance Da between LEDs arranged at equal intervals on each light source substrate 2, or the color of light in the cover 3 Even when the distribution and the luminance distribution are “uniform” and the distance Dc is not different from the distance Da to some extent, the LEDs are said to be “equally” arranged.

  In the fourth embodiment, the LED groups 9r, 9g, and 9b collectively correspond to the “first light source group” according to the present invention, and one of the LED groups 9r, 9g, and 9b according to the present invention. Corresponding to the “second light source group”, the other one of the LED groups 9r, 9g, 9b corresponds to the “third light source group” according to the present invention. Therefore, the case shown in FIG. 13E corresponds to the “first illumination mode” according to the present invention, and any one of the cases shown in FIGS. 13B to 13D corresponds to the “first illumination mode” according to the present invention. Corresponding to the “second illumination mode”, any other one of the cases shown in FIGS. 13B to 13D corresponds to the “third illumination mode” according to the present invention.

  Moreover, the shape of the ceiling light which concerns on Embodiment 1-4 was demonstrated that it was circular. However, the shape of the ceiling light according to the embodiment of the present invention is not limited to a circular shape, and may be any rotational symmetry. Therefore, the shape of the ceiling light may be, for example, a regular polygon (rectangular as an example).

Embodiments of the present invention can be summarized as follows.
A ceiling light 100 having a rotationally symmetric outer shape, which includes a plurality of LEDs arranged rotationally symmetrically with respect to the central axis c of the ceiling light 100, and each of the plurality of LEDs is a plane P orthogonal to the central axis c. A light source unit 2a provided so as to emit light in a direction substantially parallel to the light source, a circuit board 5 for lighting a plurality of LEDs, and a surface of the frame 4 on the side where the light source unit 2a is provided with a central axis c. Reflective sheet 41 provided in a rotationally symmetric shape with respect to the light, light emitted from the lit LED among the plurality of LEDs, and light reflected by reflective sheet 41 And a plurality of LEDs including an LED group 7a and an LED group 7b. The LED group 7a is an illumination mode for illuminating with white light under the control of the circuit board 5. The LED group 7b is controlled by the circuit board 5 so that at least one of the color distribution and the luminance distribution in the cover 3 of the light emitted from the corresponding LED among the plurality of LEDs is non-uniform. Ceiling light 100 lit in certain lighting mode 2.

  According to said structure, while being able to produce aesthetics, the illuminating device suitable for use in daily life is realizable.

  The LED belonging to the LED group 9g among the plurality of LEDs is a ceiling light that is lit in the illumination mode 3 in which at least one of the color distribution and the luminance distribution in the cover 3 is non-uniform under the control of the circuit board 5.

According to said structure, a different pattern can appear on the cover 3. FIG.
In the illumination mode 1, the LED group 7b emits light so that the color distribution and the luminance distribution in the cover 3 are uniform.

  According to said structure, while reducing a glare, the illumination intensity distribution in an irradiation surface can be made uniform.

  A remote controller 1a that accepts an operation by a user for selecting a desired illumination mode among the illumination modes 1 and 2 is further provided, and the remote controller 1a selects the illumination mode selected by the user. The ceiling light 100 outputs a signal instructing to the circuit board 5.

According to said structure, the user can select the presence or absence of the pattern of the cover 3. FIG.
The light source unit 2a includes a plurality of light source substrates 2 each having a corresponding LED of a plurality of LEDs arranged therein, and the plurality of light source substrates 2 are arranged in an annular shape around the central axis c of the ceiling light 100. Ceiling light 100.

  According to said structure, light can be illuminated to the perimeter of the outer peripheral direction of the ceiling light 100. FIG.

  The shape of the light source unit 2a is a regular polygon (regular octagon), and the plurality of light source substrates 2 are provided in positions corresponding to the sides of the regular polygon.

  According to said structure, a light source board | substrate becomes one kind and can reduce a number of members and an assembly man-hour.

Each of the plurality of light sources is an LED, which is an LED.
According to said structure, the light source of abundant color can be obtained.

  The white light that the LED group 7a illuminates is a ceiling light 100 that is white that is close to black body radiation.

  According to said structure, the illuminating device which is familiar to a user and a little uncomfortable feeling is realizable. In addition, when the user goes indoors (under the ceiling light 100) and outdoors (under sunlight), the difference in the appearance of the color of the object is reduced.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  100 ceiling light, 1 body, 1a remote controller, 2,202 to 206 light source board, 2a light source unit, 3 cover, 4 frame, 41 reflective sheet, 5 circuit board, 7a, 7b, 8a to 8c, 9r, 9g, 9b LED group, 10 power supply circuit, 11 CPU, 12 memory, 13 PWM control circuit, M1-M3 PWM signal, 14 voltage conversion circuit, 15 receiver, 17 heat sink, 18 center cover, 21 and 22 FET.

Claims (8)

A lighting device having a rotationally symmetric outer shape,
A plurality of light sources arranged rotationally symmetrically with respect to a central axis of the lighting device, and each of the plurality of light sources is provided so as to emit light in a direction substantially parallel to a plane orthogonal to the central axis. A light source unit,
A reflective surface having a rotationally symmetric shape and reflecting light emitted in the substantially parallel direction;
A control circuit for lighting the plurality of light sources;
A cover that covers the plurality of light sources and diffuses light emitted from a light source that is lit among the plurality of light sources and light from the reflection surface;
The plurality of light sources includes first and second light source groups,
The first light source group is lit in a first illumination mode in which the irradiation surface is illuminated with white light under the control of the control circuit,
The second light source group is controlled by the control circuit, the color or luminance bias in the cover by the light emitted from the light source of the relevant occurs among the plurality of light sources, and the bias of said cover An illumination device that lights in a second illumination mode having periodicity along the outer peripheral direction . The plurality of light sources further includes a third light source group,
The light sources belonging to the third light source group among the plurality of light sources have a color or luminance bias in the cover under the control of the control circuit , and the bias is periodic along the outer peripheral direction of the cover. Lights in a third illumination mode having
2. The lighting device according to claim 1, wherein the third lighting mode is different from the second lighting mode in a position of a bias appearing in the cover .   3. The lighting device according to claim 1, wherein in the first lighting mode, the first light source group emits light so that a color distribution and a luminance distribution in the cover are uniform. An operation unit that accepts an operation by a user for selecting a desired illumination mode of the first and second illumination modes;
The lighting device according to claim 1, wherein the operation unit outputs a signal that instructs the control circuit to select a lighting mode selected by the user, to the control circuit. The light source unit includes a plurality of small substrates each having a corresponding light source among the plurality of light sources disposed thereon,
The lighting device according to claim 1, wherein the plurality of small substrates are annularly arranged around the central axis of the lighting device.   The illuminating device according to claim 1 or 2, wherein the light sources included in the second light source group are arranged so that the illuminance on the irradiation surface is uniform.   The lighting device according to claim 2, wherein a light source belonging to the third light source group has a light emission color different from that of the light source belonging to the second light source group.   The first light source group is classified into a plurality of light source groups having different emission colors,
  The plurality of light source groups irradiate the irradiation surface with white light, and are arranged so that a color deviation appears periodically along the outer peripheral direction of the cover. Lighting equipment.

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