Lighting device, lighting control method, and program

Abstract

To provide a lighting device, etc., capable of turning on light-emitting elements so as to be bright as further as possible while making appropriate a current supplied to the light-emitting elements so as to provide an operation temperature equal to or lower than a rating temperature.SOLUTION: A lighting device 10 comprises: a plurality of light sources (light-emitting elements 111) arrayed in a two-dimensional manner; a storage section 125 which stores light emission pattern information for turning on the plurality of light sources (light-emitting elements 111); a correction section 124 which corrects the light emission pattern information; and a lighting control circuit 123 which determines a current value to be supplied to the plurality of light sources (light-emitting elements 111). The correction section 124 corrects the light emission pattern information based on operation temperature information of the plurality of light sources (light-emitting elements 111), and the lighting control circuit 123 determines the current value to be supplied to the plurality of light sources (light-emitting elements 111) in accordance with the post-correction light emission pattern information which is corrected by the correction section 124.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a lighting device, a lighting control method, and a program. [Background technology]

[0002] The LED display device of Patent Document 1 is formed by arranging multiple LED modules, each of which has multiple LED elements, in a row and column, and is equipped with a display surface that displays information by combining the lit and unlit states of the multiple LED elements, and a current detection unit that detects the value of the supply current supplied to the lit LED elements on the display surface. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-20808 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the LED elements that make up the LED module of Patent Document 1, the temperature of each of the LED elements varies greatly depending on the light emission pattern, which poses a problem that the desired light intensity cannot be obtained simply by setting the current value supplied to each of the LED elements, or that even if the desired light intensity is obtained, the temperature of each of the LED elements may exceed the rated temperature.

[0005] In view of the above problems, the present disclosure aims to provide a lighting device or the like that can turn on a light source as brightly as possible while adjusting the current supplied to the light source so that the operating temperature is below the rated temperature. [Means for solving the problem]

[0006] An illumination device according to one aspect of the present disclosure includes a plurality of light sources arranged two-dimensionally, a memory unit that stores light emission pattern information for turning on the plurality of light sources, a correction unit that corrects the light emission pattern information, and an illumination control circuit that determines a current value to be supplied to the plurality of light sources, wherein the correction unit corrects the light emission pattern information based on operating temperature information of the plurality of light sources, and the illumination control circuit determines a current value to be supplied to the plurality of light sources in accordance with the light emission pattern information corrected by the correction unit.

[0007] A lighting control method according to one aspect of the present disclosure includes a correction unit correcting light emission pattern information for lighting a plurality of light sources arranged two-dimensionally and stored in a memory unit, a lighting control circuit determining current values ​​to be supplied to the plurality of light sources, a correction unit correcting the light emission pattern information based on operating temperatures of the plurality of light sources, and a lighting control circuit determining current values ​​to be supplied to the plurality of light sources according to the light emission pattern information corrected by the correction unit.

[0008] A program according to one aspect of the present disclosure is a program that enables a computer to execute a lighting control method. [Effects of the Invention]

[0009] According to the lighting device and the like of the present disclosure, the light source can be turned on as brightly as possible while adjusting the current supplied to the light source so that the operating temperature is equal to or lower than the rated temperature. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a block diagram showing an overall configuration including a lighting system according to an embodiment. [Figure 2] FIG. 2 is a diagram showing a case where one or more light-emitting elements among a plurality of light-emitting elements are lit. [Figure 3] FIG. 3 is a diagram showing a case where the light emission intensity is reduced when a light emitting element whose temperature is equal to or higher than the rated temperature is included. [Figure 4A]FIG. 4A is a flowchart showing a first operational example of the lighting device. [Figure 4B] FIG. 4B is a flowchart showing a second operation example of the lighting device. [Figure 5] FIG. 5 is a schematic diagram of a lighting device according to another modified example. [Figure 6] FIG. 6 is a schematic side view of an illumination device according to another modified example. [Figure 7] FIG. 7 is an enlarged schematic diagram of an illumination device according to another modified example. [Figure 8] FIG. 8 is an enlarged schematic perspective view of an illumination device according to another modified example. [Figure 9] FIG. 9 is a schematic cross-sectional view of an illumination device according to another modified example. [Figure 10] FIG. 10 is a schematic diagram of a lighting device according to another modified example. [Figure 11] FIG. 11 is a schematic perspective view of an illumination device according to another modified example. [Figure 12] FIG. 12 is a schematic cross-sectional view of an illumination device according to another modified example. [Figure 13] FIG. 13 is another schematic cross-sectional view of an illumination device according to another modified example. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that each of the embodiments described below represents a specific example of the present invention. Therefore, the numerical values, shapes, materials, components, component arrangements and connection forms, steps, step sequences, etc. shown in the following embodiments are merely examples and are not intended to limit the present invention. Therefore, among the components in the following embodiments, components not recited in the independent claims will be described as optional components.

[0012] Furthermore, each figure is a schematic diagram and is not necessarily an exact illustration. Therefore, for example, the scales and the like do not necessarily match in each figure. Furthermore, in each figure, substantially the same configurations are assigned the same reference numerals, and duplicate explanations are omitted or simplified.

[0013] Furthermore, in this specification, terms indicating the relationship between elements, terms indicating the shape of elements, and numerical ranges are not expressions that only express a strict meaning, but are expressions that also include a substantially equivalent range, for example, a difference of about a few percent.

[0014] (Embodiment) <Configuration> First, the configuration of a lighting system 1 according to an embodiment will be described with reference to FIGS.

[0015] FIG. 1 is a block diagram illustrating an overall configuration of a lighting system 1 including a lighting device 10 according to an embodiment. FIG. 2 illustrates a case where one or more of a plurality of light-emitting elements 111 are turned on. (a1) and (c1) of FIG. 2 illustrate a case where the light-emitting elements 111 are locally turned on at high brightness. (b1) of FIG. 2 illustrates a case where all of the light-emitting elements 111 are turned on. (a2), (b2), and (c2) of FIG. 2 illustrate a plurality of groups of two or more light-emitting elements 111 obtained by downscaling (a1), (b1), and (c1) of FIG. 2. (a3) ​​of FIG. 2 illustrates a case where the light-emitting pattern information is corrected and the light-emitting elements 111 are turned on according to the corrected light-emitting pattern information. (b3) and (c3) of FIG. 2 illustrate a case where the light-emitting pattern information is not corrected and the light-emitting elements 111 are turned on according to the current light-emitting pattern information. The dashed-dotted lines in (a1), (b1), and (c1) of FIG. 2 indicate groups of two or more light-emitting elements 111. In FIG. 2, the lighter the hatching of the dots, the higher the brightness, while black without hatching means that the light is off. FIG. 3 is a diagram showing a case where the light-emitting intensity is reduced when a light-emitting element 111 whose temperature is above the rated temperature is included. (a) of FIG. 3 shows two light objects. (b) of FIG. 3 shows a light object in which one of the two light objects emits light and the light-emitting intensity of all of the one or more light-emitting elements 111 is reduced when the light-emitting element 111 emitted by the light-emitting element 111 to form multiple light objects includes light-emitting elements 111 whose temperature is above the rated temperature. (c) of FIG. 3 shows a light object in which the light-emitting intensity of all of the two or more light-emitting elements 111 is reduced when the light-emitting element 111 emitted by the light-emitting element 111 to form multiple light objects includes light-emitting elements 111 whose temperature is above the rated temperature.

[0016] As shown in FIG. 1, the lighting system 1 includes a lighting device 10 and a terminal device 30.

[0017] The lighting device 10 can emit one or more spot illumination lights onto an illumination object. Therefore, by emitting a plurality of spot illumination lights, the lighting device 10 can simultaneously project a plurality of light objects illuminated onto the illumination object.

[0018] The illumination target may be a wall, floor, ceiling, shelf, stand, or the like illuminated with spot illumination light, or may be a commodity or object of appreciation placed thereon.

[0019] The light object is a light effect pattern projected by spot illumination light projected onto an illumination target. When the light object is projected onto the illumination target, the illumination target is effected by the light object.

[0020] The space illuminated by the lighting device 10 may be an indoor space such as a room, a corridor, a ceiling, a wall, or a floor in a building, or an outdoor space such as an outer wall of a building, the ground, or an installed object.

[0021] The lighting device 10 is, for example, a spotlight, and is attached to a wiring fixture (for example, a wiring duct or a ceiling hook) provided on a ceiling or a wall. Note that the lighting device 10 is not limited to a spotlight, and may be, for example, a downlight or a ceiling light.

[0022] 1, the lighting device 10 includes a light-emitting module 110, a communication unit 122, a temperature acquisition unit 126, a correction unit 124, a lighting control circuit 123, a storage unit 125, and a power supply unit (not shown). The communication unit 122 and the lighting control circuit 123 configure the lighting control circuit 123. Alternatively, the input interface and the lighting control circuit 123 may configure the lighting control circuit 123. The communication unit 122 or the input interface is an example of an acquisition unit.

[0023] The light emitting module 110 emits white light, for example, along the optical axis direction, which is the direction in which the main light emitted by the light emitting element 111 is emitted and is perpendicular to the light emitting surface of the light emitting module 110.

[0024] The light emitting module 110 has a plurality of light emitting elements 111 that emit light, and a light source substrate 112 on which the plurality of light emitting elements 111 are arranged.

[0025] Specifically, the light-emitting module 110 has a plurality of light-emitting elements 111 and a wavelength converter two-dimensionally arranged on the surface of the light source substrate 112. In this embodiment, the plurality of light-emitting elements 111 are arranged in a two-dimensional matrix on the surface of the light source substrate 112. The plurality of light-emitting elements 111 are arranged in an array on the surface of the light source substrate 112. Specifically, the plurality of light-emitting elements 111 are regularly arranged side by side in a matrix of M rows and N columns. Here, at least one of M and N is a natural number greater than or equal to 2. M and N may be the same value or different values. The arrangement intervals of the light-emitting elements 111 in the row direction and the column direction may be the same or different. In this embodiment, the outer shape of the area in which the plurality of light-emitting elements 111 are arranged is rectangular, but may be another shape, such as a circle. The light-emitting element 111 is an example of a light source. The light-emitting module 110 may also be an example of a light source.

[0026] Each of the plurality of light-emitting elements 111 emits light in response to a current supplied from the drive unit 121 of the illumination control circuit 123. Each of the plurality of light-emitting elements 111 is, for example, a blue light-emitting element that emits blue light. Note that a green light-emitting element that emits green light and / or a red light-emitting element that emits red light may also be used. In each of the plurality of light-emitting elements 111, a yellow phosphor is disposed on the light-emitting side of the blue light-emitting element as an example of a wavelength converter. The blue light-emitting element is, for example, an LED (Light Emitting Diode). Specifically, the blue light-emitting element is, for example, a minute LED with a size on the order of several hundred μm. The yellow phosphor is a phosphor that is excited by blue light and emits yellow light. Each light-emitting element 111 emits white light as a mixture of blue light and yellow light. The yellow phosphor is, for example, a YAG (yttrium aluminum garnet)-based phosphor, but is not limited thereto.

[0027] The yellow phosphor may be provided so as to cover the plurality of blue light-emitting elements. For example, a yellow phosphor may be disposed so as to entirely cover the plurality of blue light-emitting elements arranged in a two-dimensional matrix.

[0028] Furthermore, the light-emitting module 110 can adjust the light intensity and color. For example, the light-emitting intensity of each of the plurality of light-emitting elements 111 can be changed according to the amount of current supplied from the driving unit 121 of the lighting control circuit 123. For example, the plurality of light-emitting elements 111 may include a plurality of types of light-emitting elements 111 that emit white light with different color temperatures. By adjusting the light-emitting intensities of the plurality of types of light-emitting elements 111, the light-emitting module 110 can emit white light with a desired color temperature.

[0029] The plurality of light emitting elements 111 are mounted on a light source substrate 112. The light source substrate 112 is a rigid substrate, but may be a flexible substrate. The light source substrate 112 is provided with pattern wiring for electrically connecting each of the plurality of light emitting elements 111 to a drive unit 121 of a lighting control circuit 123.

[0030] The temperature acquisition unit 126 can acquire operating temperature information of each of the multiple light-emitting elements 111. For example, the temperature acquisition unit 126 is a measurement unit or sensor that can measure or detect the temperature of each of the multiple light-emitting elements 111 and acquire the operating temperature information of each of the multiple light-emitting elements 111. The temperature acquisition unit 126 can output the acquired operating temperature information of each of the multiple light-emitting elements 111 to the correction unit 124. The operating temperature information includes information indicating the current operating temperature of the light-emitting element 111. The operating temperature information may also include information indicating the operating temperature of the light-emitting element 111 that will be estimated in the future based on the light emission pattern. Note that the temperature acquisition unit 126 does not need to be included as a component of the lighting device 10. In this case, the lighting device 10 may acquire the operating temperature information from an external source.

[0031] The correction unit 124 acquires operating temperature information from the temperature acquisition unit 126, and based on the acquired operating temperature information, corrects the light emission pattern information stored in the storage unit 125. The light emission pattern information is data indicating the shape, light emission intensity, hue, pattern, position, size, etc. of the light object to be irradiated onto the irradiation target.

[0032] When the light emitting elements 111 are lit based on the light emission pattern information, if the operating temperature of the light emitting elements 111 indicated in the operating temperature information is a high temperature equal to or higher than the rated temperature and there is a high-temperature light emitting element 111 whose light emission intensity is equal to or higher than a threshold, the correction unit 124 identifies the density of the high-temperature light emitting elements 111. The density of the light emitting elements 111 is the number of adjacent high-temperature light emitting elements 111 among two or more high-temperature light emitting elements 111. Note that the density may also be the number of high-temperature light emitting elements 111 present per predetermined area.

[0033] For example, in the above case, the correction unit 124 identifies the number of adjacent high-temperature light-emitting elements 111 among two or more high-temperature light-emitting elements 111 (high-temperature light sources) whose emission intensity is equal to or greater than a threshold. At this time, the correction unit 124 can also identify the number of high-temperature light-emitting elements 111 whose emission intensity is equal to or greater than a threshold, even if the current operating temperature of the light-emitting elements 111 is low, and it is estimated that the operating temperature of the light-emitting elements 111 will become high in the future based on the emission pattern. The correction unit 124 corrects the emission pattern information based on the identified density. In other words, the correction unit 124 corrects the emission pattern information based on the identified number. The correction unit 124 can generate corrected emission pattern information.

[0034] Specifically, when the light-emitting element 111 is turned on based on the light-emission pattern information, the correction unit 124 determines, based on the operating temperature information, whether or not there is a high-temperature light-emitting element 111 whose light-emission intensity is equal to or greater than a threshold (e.g., 2 or greater). When there is a high-temperature light-emitting element 111 whose light-emission intensity is equal to or greater than a threshold (e.g., 2 or greater), the correction unit 124 identifies the number of adjacent high-temperature light-emitting elements 111 in a group among the high-temperature light-emitting elements 111 whose light-emission intensity is equal to or greater than the threshold. In this way, when the light-emitting element 111 is turned on based on the light-emission pattern information, the correction unit 124 identifies the number of adjacent high-temperature light-emitting elements 111 in a group based on the operating temperature information. In (a1) of FIG. 2, as indicated by hatching with dots, an example is shown in which the number of adjacent high-temperature light-emitting elements 111 in a group is 9.

[0035] The threshold value is a value calculated from various experimental data so that the light emitting element 111 does not exceed its rated temperature.

[0036] The correction unit 124 can correct the light emission pattern information based on the identified number (the number of adjacent high-temperature light emitting elements 111 in a group).

[0037] Specifically, when there is a high-temperature light-emitting element 111 whose emission intensity is equal to or greater than a threshold, the correction unit 124 can correct the emission pattern information so as to reduce the emission intensity of a group of high-temperature light-emitting elements 111 adjacent to the high-temperature light-emitting element 111. That is, the correction unit 124 can correct the emission pattern information by multiplying the current value supplied to the group of high-temperature light-emitting elements 111 indicated in the emission pattern information, i.e., the emission intensity of the light-emitting elements 111, by a coefficient less than 1, and generate the emission pattern information after correction. For example, as shown in (a) and (b) of FIG. 3, the correction unit 124 can correct the emission pattern information so as to reduce the emission intensity of one or more light-emitting elements 111 that project one of two light objects, and generate the emission pattern information after correction.

[0038] Furthermore, when there is a light-emitting element 111 with a high temperature whose emission intensity is equal to or higher than a threshold, the correction unit 124 can correct the emission pattern information so that the emission intensities of all the light-emitting elements 111 indicated in the emission pattern information are reduced. That is, the correction unit 124 can correct the emission pattern information by multiplying the current values ​​supplied to all the light-emitting elements 111 indicated in the emission pattern information, i.e., the emission intensities of the light-emitting elements 111, by a coefficient less than 1, and generate the emission pattern information after correction. For example, as shown in (a) and (c) of FIG. 3, the correction unit 124 can correct the emission pattern information so that the emission intensities of all of the two or more light-emitting elements 111 that project two light objects are reduced, and generate the emission pattern information after correction.

[0039] Note that the upper limit of the current supplied to the light-emitting elements 111 may be reduced as the number of adjacent elements (the number of adjacent elements) increases. As an example, the correction unit 124 may correct the light emission pattern information so that when the number of adjacent light-emitting elements 111 is five or less, a current of up to 5 mA is supplied to each light-emitting element 111; when the number of adjacent light-emitting elements 111 is six or less, a current of up to 4 mA is supplied to each light-emitting element 111; and when the number of adjacent light-emitting elements 111 is seven or more, a current of up to 1 mA is supplied to each light-emitting element 111. In other words, the correction unit 124 may have a correlation table between the number of adjacent light-emitting elements 111 and the upper limit of the current supplied to one light-emitting element 111. Furthermore, this correlation table may be stored in the storage unit 125. The correction unit 124 can output the corrected light emission pattern information to the illumination control circuit 123.

[0040] In this case, the lighting control circuit 123 determines the current value to be supplied to the plurality of light-emitting elements 111 in accordance with the light-emitting pattern information corrected by the correction unit 124 based on the number, and causes the plurality of light-emitting elements 111 to emit light at the determined current value.

[0041] Furthermore, if there is no light-emitting element 111 whose light-emitting intensity is equal to or greater than a threshold value (for example, equal to or greater than 2), the correction unit 124 does not correct the light-emitting pattern information. Therefore, the illumination control circuit 123 determines the current value to be supplied to the plurality of light-emitting elements 111 based on the light-emitting pattern information stored in the storage unit 125, and causes the plurality of light-emitting elements 111 to emit light at the determined current value.

[0042] In another example, when the light-emitting element 111 is turned on based on the light-emitting pattern information, if there is a high-temperature light-emitting element 111 whose light-emitting intensity is equal to or greater than a threshold value (e.g., 2 or greater), the correction unit 124 can downscale the light-emitting pattern information stored in the memory unit 125, correct the light-emitting pattern information after the downscale process, and generate corrected light-emitting pattern information.

[0043] Specifically, after downscaling the light emission intensities of all light emitting elements 111 indicated by the light emission pattern information stored in the storage unit 125, the correction unit 124 reduces the resolution indicated by the light emission pattern information when the operating temperature of the light emitting elements 111 indicated by the operating temperature information is a high temperature equal to or higher than the rated temperature and there are light emitting elements 111 with light emission intensities equal to or higher than a threshold (e.g., two or more). For example, before downscaling, one light emitting element 111 corresponds to one pixel of the light emission pattern information, but after downscaling, two or more light emitting elements 111 are grouped together and correspond to one pixel of the light emission pattern information. When downscaling, the correction unit 124 smoothes the two or more light emitting elements 111 corresponding to one pixel as one group. For example, (a1) and (a2) in FIG. 2 illustrate 9 × 9 light emitting elements 111. The light emission pattern information before downscaling is 9×9 pixels, but the correction unit 124 generates light emission pattern information that has been downscaled to 3×3 pixels so that 3×3 light emitting elements 111 become one pixel.

[0044] The correction unit 124 determines whether or not there is a high-temperature group whose emission intensity is equal to or greater than a threshold among the groups indicated by the downscaled emission pattern information. If the correction unit 124 determines that there is a high-temperature group whose emission intensity is equal to or greater than a threshold, it can correct the emission pattern information for that group.

[0045] Specifically, when there is a light-emitting element 111 with a high temperature whose light-emitting intensity is equal to or higher than a threshold, the correction unit 124 can correct the light-emitting pattern information by multiplying the light-emitting intensities of all the light-emitting elements 111 in the group included in the light-emitting pattern information by a coefficient less than 1. For example, the correction unit 124 can correct the light-emitting pattern information by multiplying the current value to be supplied to the group indicated in the light-emitting pattern information by a coefficient less than 1. For example, as shown in (a) and (b) of FIG. 3, the correction unit 124 can correct the light-emitting pattern information so that the light-emitting intensities of one or more light-emitting elements 111 that project one of two light objects are reduced, thereby generating the corrected light-emitting pattern information.

[0046] Furthermore, when there is a light-emitting element 111 with a high temperature whose light-emitting intensity is equal to or higher than a threshold, the correction unit 124 can correct the light-emitting pattern information by multiplying the light-emitting intensities of all groups indicated by the light-emitting pattern information by a coefficient less than 1. For example, the correction unit 124 can correct the light-emitting pattern information by multiplying the current values ​​supplied to all groups indicated by the light-emitting pattern information by a coefficient less than 1. The correction unit 124 can output the corrected light-emitting pattern information to the illumination control circuit 123. For example, as shown in (a) and (c) of FIG. 3, the correction unit 124 can correct the light-emitting pattern information so that the light-emitting intensities of all of the two or more light-emitting elements 111 that project two light objects are reduced, thereby generating the corrected light-emitting pattern information.

[0047] In this case, the illumination control circuit 123 determines a current value to be supplied to the plurality of light-emitting elements 111 in accordance with the light-emitting pattern information after downscaling and correction by the correction unit 124, and causes the plurality of light-emitting elements 111 to emit light at the determined current value. For example, in (a3) ​​of Fig. 2, the plurality of light-emitting elements 111 emit light based on light-emitting pattern information that has been downscaled to 3 x 3 pixels and corrected so as to reduce the current value to be supplied to the group in question so that the group will be at or below the rated temperature.

[0048] In this way, when a group of high-temperature light-emitting elements 111 exists, the lighting control circuit 123 adjusts the current supplied to the group of high-temperature light-emitting elements 111, and when downscaling processing is performed, adjusts the current supplied to each light-emitting element 111 indicated in the light emission pattern information. As a result, it is possible to light up as many light-emitting elements 111 as brightly as possible while preventing the light-emitting elements 111 from exceeding their rated temperature.

[0049] The lighting control circuit 123 is realized by, for example, an LSI (Large Scale Integration), which is an integrated circuit (IC). Note that the integrated circuit is not limited to an LSI, and may be a dedicated circuit or a general-purpose processor. In the embodiment, the lighting control circuit 123 is a microcontroller. The microcontroller includes, for example, a non-volatile memory in which a program is stored, a volatile memory which is a temporary storage area for executing the program, an input / output port, and a processor which executes the program. The lighting control circuit 123 may also be a programmable FPGA (Field Programmable Gate Array) or a reconfigurable processor in which the connections and settings of circuit cells in the LSI can be reconfigured. The functions executed by the first processing unit 22 may be realized by software or by hardware.

[0050] The lighting control circuit 123 controls the two-dimensionally arranged light-emitting elements 111 by outputting a control signal based on the control instruction to the drive unit 121. The lighting control circuit 123 individually controls the light-emitting elements 111 to emit light that becomes a light object from the light-emitting module 110. Specifically, the lighting control circuit 123 identifies one or more light-emitting elements 111 to be driven based on the control instruction received by the communication unit 122 and determines the light emission intensity of each of the one or more light-emitting elements 111. The lighting control circuit 123 generates a control signal based on the light emission intensity for each of the identified one or more light-emitting elements 111. The lighting control circuit 123 outputs a control signal to the drive unit 121 to turn on the identified one or more light-emitting elements 111. The drive unit 121 individually drives the multiple light-emitting elements 111 in accordance with the received control signal. In other words, the drive unit 121 supplies current to one or more light-emitting elements 111 indicated in the control signal among the multiple light-emitting elements 111 to light them up, and does not supply current to the remaining light-emitting elements 111 indicated in the control signal to turn them off. The one or more light-emitting elements 111 specified by the lighting control circuit 123 are turned on. As a result, light is emitted from the light-emitting module 110 via the optical member, and the spot illumination light emitted from the lighting device 10 is irradiated onto the illumination object, thereby forming an image of the light object on the illumination object. In other words, the light object irradiated with the spot illumination light is projected onto the illumination object.

[0051] The control instruction is an instruction input by the user to the input unit in order to project a desired light object on the irradiation target. The control instruction includes, for example, an instruction to project a figure handwritten by the user on the irradiation target, an instruction to select light emission pattern information stored in the storage unit 125 by the user and project the selected light emission pattern information as a light object on the irradiation target, etc.

[0052] The lighting control circuit 123 can control the shape, light emission intensity, hue (e.g., color temperature), pattern, position, size, etc. of the light object so that they change periodically. In other words, the lighting control circuit 123 can project still image light objects and moving image light objects onto an illumination target. Therefore, the lighting control circuit 123 can dynamically change the shape, light emission intensity, hue, pattern, position, size, etc. of the light object and display it on the illumination target. In other words, in this embodiment, the lighting control circuit 123 can produce not only still image-like effects but also moving image-like effects.

[0053] The driving unit 121 supplies a current for driving the light-emitting module 110. Specifically, the driving unit 121 supplies a current for driving each of the plurality of light-emitting elements 111 independently (i.e., individually) according to a control signal based on a control instruction, which is information received by the lighting control circuit 123. This allows each of the plurality of light-emitting elements 111 to be individually controlled in terms of on / off, light-emitting intensity, light-emitting period, etc. For example, by individually controlling the on / off of each of the plurality of light-emitting elements 111, it is possible to emit spot illumination light with brightness and darkness for each illumination area. Then, by irradiating an illumination object with the spot illumination light, it is possible to form an image of a light object on the illumination object according to the brightness and darkness.

[0054] The control signal includes the on / off, light emission intensity, light emission period, etc. of each of the multiple light emitting elements 111, and is a signal that the illumination control circuit 123 outputs to the drive unit 121 to control the lighting of the light emitting elements 111.

[0055] The lighting control circuit 123 includes a drive unit 121 .

[0056] The driver 121 is realized by, for example, an ASIC (Application Specific Integrated Circuit). The driver 121 supplies a current modulated by PWM (Pulse Width Modulation) to each of the plurality of light-emitting elements 111. The driver 121 adjusts the pulse width of the current supplied to each of the plurality of light-emitting elements 111, thereby changing the light emission intensity of each of the plurality of light-emitting elements 111 and achieving a dimming function. Note that the dimming method is not limited to PWM modulation, and may be another modulation method such as amplitude modulation or phase modulation.

[0057] The driving unit 121 drives one or more light-emitting elements 111 identified by the lighting control circuit 123 so as to illuminate an irradiation target. Specifically, the driving unit 121 identifies one or more light-emitting elements 111 to be turned on as indicated in the light-emitting pattern information based on the light-emitting pattern information stored in the storage unit 125, and adjusts the current supplied to the identified one or more light-emitting elements 111.

[0058] The communication unit 122 can wirelessly communicate with the terminal device 30. In this embodiment, the communication unit 122 can wirelessly communicate via an access point. Specifically, when the communication unit 122 wirelessly communicates with the terminal device 30, the communication unit 122 may use short-range wireless communication such as ZigBee (registered trademark) or a wireless LAN (Local Area Network). The wireless communication method (communication standard) may be communication via a wide area communication network such as the Internet. The communication between the communication unit 122 and the terminal device 30 may be wired communication. The wired communication is, for example, communication using power line communication (PLC) or a wired LAN. The communication unit 122 is realized by, for example, an antenna and a wireless processing circuit that processes a signal received by the antenna.

[0059] The storage unit 125 is a storage device that stores computer programs and the like executed by the lighting control circuit 123. The storage unit 125 is realized by, for example, a semiconductor memory.

[0060] The storage unit 125 stores light emission pattern information for projecting a light object, for which a light emission pattern has been set, onto an illumination target. The light emission pattern information includes data set in advance and data set by the user. The storage unit 125 can also store corrected light emission pattern information.

[0061] The power supply unit supplies operating power to the lighting control circuit 123 and the light-emitting module 110. The power supply unit has, for example, an AC-DC converter circuit, converts AC power supplied from a commercial power source into DC power, and supplies the converted DC power to the lighting control circuit 123 and the light-emitting module 110.

[0062] The lighting device 10 further includes an optical member. The optical member is a projection lens or the like that projects light emitted by one or more light-emitting elements 111 driven by the driving unit 121 forward. When the optical member is a projection lens, the optical member applies a predetermined optical effect to the light emitted from the light-emitting module 110 and projects the light forward so that the light emitted by the one or more light-emitting elements 111 is focused as spot illumination light on an illumination object located in front of the light-emitting element. When the optical member is a projection lens, the lighting device 10 may be provided with a plurality of projection lenses, or may be provided with a single lens.

[0063] Next, a terminal device 30 according to an embodiment that can operate the lighting device 10 will be described.

[0064] The terminal device 30 is, for example, a mobile terminal such as a smartphone or a tablet terminal. In the embodiment, the terminal device 30 is a tablet terminal. Note that the terminal device 30 may also be, for example, a device fixed to a wall or the like, or a device such as a desktop or laptop personal computer.

[0065] The terminal device 30 allows operation input for controlling the lighting control circuit 123 of the lighting device 10. By inputting operation to the terminal device 30, the user can operate a predetermined light object that is irradiated by the lighting device 10.

[0066] The terminal device 30 can receive an operation input for controlling an irradiation pattern. Specifically, the terminal device 30 can receive an operation input for controlling an irradiation pattern of one or more light objects irradiated onto an irradiation target.

[0067] The terminal device 30 can receive and acquire object data of a light object transmitted from an external device. Furthermore, when a user connects a secondary storage device such as a flash memory to the terminal device 30, the terminal device 30 can acquire light emission pattern information from the secondary storage device. Here, the external device is another mobile terminal, another device fixed to a wall or the like, or another device such as a personal computer.

[0068] <Example 1> Next, a first example of the operation performed by the lighting device 10 will be described with reference to FIG. 4A.

[0069] FIG. 4A is a flowchart showing a first operational example of the lighting device 10. In FIG.

[0070] 4A, the correction unit 124 first acquires light emission pattern information from the storage unit 125 (S11). That is, the correction unit 124 acquires light emission pattern information for turning on a plurality of light sources that are two-dimensionally arranged and stored in the storage unit 125.

[0071] Next, the temperature acquisition unit 126 acquires the operating temperature information of each of the plurality of light-emitting elements 111. The correction unit 124 acquires the operating temperature information of each of the plurality of light-emitting elements 111 from the temperature acquisition unit 126. The correction unit 124 identifies (counts) the number of high-temperature light-emitting elements 111 based on the operating temperature information and the light-emitting pattern information (S12).

[0072] Specifically, when the light-emitting element 111 is turned on based on the light-emitting pattern information, the correction unit 124 determines whether or not there are two or more light-emitting elements 111 whose light-emitting intensity is equal to or greater than the threshold, taking into account the operating temperature information. That is, when the light-emitting element 111 is turned on based on the light-emitting pattern information, the correction unit 124 counts the number of light-emitting elements 111 whose operating temperatures indicated in the operating temperature information are high, equal to or greater than the rated temperature, and whose light-emitting intensity is equal to or greater than the threshold. When the correction unit 124 determines by the counting that there are two or more high-temperature light-emitting elements 111 whose light-emitting intensity is equal to or greater than the threshold, the correction unit 124 further identifies (counts) the number of adjacent groups of high-temperature light-emitting elements 111 among the two or more high-temperature light-emitting elements 111 whose light-emitting intensity is equal to or greater than the threshold.

[0073] If the correction unit 124 determines that there are no two or more light-emitting elements 111 whose emission intensity is equal to or greater than the threshold value based on the count, the correction unit 124 may end the flowchart of FIG. 4A.

[0074] Next, the correction unit 124 corrects the light emission pattern information based on the identified number (the number of the group of adjacent high-temperature light-emitting elements 111). Specifically, the correction unit 124 determines whether the light emission intensity is equal to or greater than a threshold value and whether the number of the group of adjacent high-temperature light-emitting elements 111 is equal to or greater than a predetermined value (S13).

[0075] When the correction unit 124 determines that the light emission intensity is equal to or greater than the threshold value and that the number of adjacent light emitting elements 111 with high temperatures is equal to or greater than a predetermined value (YES in S13), the correction unit 124 corrects the light emission pattern information by multiplying the light emission intensity of the group of light emitting elements 111 with high temperatures included in the light emission pattern information by a coefficient less than 1 (S14). The correction unit 124 outputs the corrected light emission pattern information to the illumination control circuit 123.

[0076] The lighting control circuit 123 lights up the plurality of light-emitting elements 111 in accordance with the light-emitting pattern information corrected by the correction unit 124 based on the number (S15). That is, the lighting control circuit 123 determines the current value to be supplied to the plurality of light-emitting elements 111 in accordance with the light-emitting pattern information corrected, and causes the plurality of light-emitting elements 111 to emit light at the determined current value.

[0077] In addition, if the correction unit 124 determines that the number of adjacent high-temperature light-emitting elements 111 in a group is less than a predetermined value (NO in S13), it does not correct the light-emitting pattern information and outputs the uncorrected light-emitting pattern information to the lighting control circuit 123.

[0078] The illumination control circuit 123 turns on the plurality of light-emitting elements 111 in accordance with the uncorrected light-emitting pattern information (S15). That is, the illumination control circuit 123 determines the current value to be supplied to the plurality of light-emitting elements 111 in accordance with the uncorrected light-emitting pattern information, and causes the plurality of light-emitting elements 111 to emit light at the determined current value.

[0079] Then, the lighting device 10 ends the flowchart of FIG.

[0080] <Example 2> Next, a second example of the operation performed by the lighting device 10 will be described with reference to FIG. 4B.

[0081] FIG. 4B is a flowchart showing a second operational example of the lighting device 10.

[0082] 4B, correction unit 124 first acquires light emission pattern information from storage unit 125 (S21). That is, correction unit 124 acquires light emission pattern information for turning on a plurality of light sources that are two-dimensionally arranged and stored in storage unit 125.

[0083] Next, the temperature acquisition unit 126 acquires operating temperature information of each of the plurality of light-emitting elements 111. The correction unit 124 acquires the operating temperature information of each of the plurality of light-emitting elements 111 from the temperature acquisition unit 126. The correction unit 124 downscales the light emission pattern information stored in the storage unit 125 based on the operating temperature information and the light emission intensity (S22). That is, the correction unit 124 downscales the light emission pattern information to generate light emission pattern information with reduced resolution.

[0084] Next, the correction unit 124 turns on the lights based on the corrected light emission pattern information, and determines whether or not there is a group among the groups whose light emission intensity is equal to or greater than a threshold value (S23).

[0085] Specifically, the correction unit 124 determines whether or not there is a high-temperature group in which the emission intensity is equal to or greater than a threshold value among the groups indicated by the downscaled emission pattern information.

[0086] Next, if the correction unit 124 determines that there is a group whose light emission intensity is equal to or greater than the threshold value among the groups (YES in S23), it corrects the light emission pattern information by multiplying the light emission intensity of each light emitting element 111 included in the light emission pattern information by a coefficient less than 1 (S24). The correction unit 124 outputs the corrected light emission pattern information to the illumination control circuit 123. For example, as shown by hatching dots in (a2) of FIG. 2, if the light emission intensity of a group including a light emitting element 111 with a high temperature is equal to or greater than the threshold value, the correction unit 124 corrects the light emission pattern information by multiplying the light emission intensity by a coefficient less than 1 so that the operating temperature of the group is less than the rated temperature. As a result, as shown in (a3) ​​of FIG. 2, the light emission intensity of the group including the light emitting element 111 with a high temperature is lower than that in (a1) and (a2) of FIG. 2.

[0087] Next, the lighting control circuit 123 lights up the plurality of light-emitting elements 111 that make up the group in accordance with the light-emitting pattern information corrected by the correction unit 124 (S25). That is, the lighting control circuit 123 determines the current value to be supplied to the group including the high-temperature light-emitting element 111 in accordance with the corrected light-emitting pattern information, and causes the group including the high-temperature light-emitting element 111 to emit light at the determined current value.

[0088] Furthermore, if the correction unit 124 determines that there is no group whose light emission intensity is equal to or greater than the threshold value among the groups (NO in S23), it outputs the light emission pattern information to the illumination control circuit 123 without correcting the light emission pattern information.

[0089] For example, when the number of high-temperature light-emitting elements 111 is 0 as shown in (b1) of Figure 2, and there are multiple high-temperature light-emitting elements 111 as shown in (c1) of Figure 2, but they are scattered one by one and the light emission intensity when smoothed on a group basis is less than the threshold, downscaling is performed as shown in (b2) and (c2) of Figure 2, but the light emission pattern information is not corrected.

[0090] Next, the illumination control circuit 123 lights up the plurality of light-emitting elements 111 in accordance with the light-emitting pattern information downscaled by the correction unit 124 (S25). That is, as shown in (b3) and (c3) of Fig. 2, the illumination control circuit 123 determines the current value to be supplied to the plurality of light-emitting elements 111 in accordance with the light-emitting pattern information that has only been downscaled, and causes the plurality of light-emitting elements 111 to emit light at the determined current value.

[0091] Then, the lighting device 10 ends the flowchart of FIG.

[0092] <Action and effect> The following describes the effects of the lighting device 10, the lighting control method, and the program according to this embodiment.

[0093] As described above, the lighting device 10 of Technology 1 in this embodiment includes a plurality of light sources (light-emitting elements 111) arranged two-dimensionally, a memory unit 125 that stores light emission pattern information for turning on the plurality of light sources (light-emitting elements 111), a correction unit 124 that corrects the light emission pattern information, and a lighting control circuit 123 that determines a current value to be supplied to the plurality of light sources (light-emitting elements 111), the correction unit 124 corrects the light emission pattern information based on operating temperature information of the plurality of light sources (light-emitting elements 111), and the lighting control circuit 123 determines a current value to be supplied to the plurality of light sources (light-emitting elements 111) in accordance with the light emission pattern information corrected by the correction unit 124.

[0094] According to this, for example, when the operating temperature of the light emitting element 111 becomes equal to or higher than the rated temperature, the light emission pattern information can be corrected so that the operating temperature of the light emitting element 111 does not become equal to or higher than the rated temperature. As a result, the illumination control circuit 123 can determine the value of the current to be supplied to the light emitting element 111 according to the light emission pattern information after the correction so that the light emitting element 111 can be illuminated as brightly as possible while being at or below the rated temperature.

[0095] Furthermore, in the present disclosure, the operating temperature of each light-emitting element 111 can be acquired, but depending on the light-emitting pattern, the light-emitting element 111 may quickly reach or exceed its rated temperature. In this case, feedback may be performed to control the current supplied to the light-emitting element so as to lower the temperature of the light-emitting element. However, if it is known in advance that the temperature of the light-emitting element 111 will reach or exceed the rated temperature in a specific light-emitting pattern, the light-emitting element 111's light-emitting pattern information may be corrected in advance to lower the temperature of the light-emitting element 111. In other words, since the operating temperature information includes not only current temperature information of the light source but also information about estimated future temperatures, the lighting control circuit 123 may also correct the light-emitting pattern information in advance, taking into account the estimated future temperature information.

[0096] Therefore, according to the present disclosure, the current supplied to the light emitting element 111 can be adjusted appropriately so that the operating temperature is equal to or lower than the rated temperature, while the light emitting element 111 can be turned on as brightly as possible.

[0097] Furthermore, the lighting device 10 of Technology 2 in this embodiment is the lighting device 10 described in Technology 1. In this case, when the light sources (light-emitting elements 111) are turned on based on the light-emitting pattern information, if the operating temperature of the light sources (light-emitting elements 111) indicated in the operating temperature information is high, equal to or higher than the rated temperature, and there is a high-temperature light source (light-emitting element 111) whose light emission intensity is equal to or higher than a threshold, the correction unit 124 identifies the density of the high-temperature light sources (light-emitting elements 111) and corrects the light-emitting pattern information based on the identified density, and the lighting control circuit 123 determines the current value to be supplied to the plurality of light sources (light-emitting elements 111) in accordance with the light-emitting pattern information corrected by the correction unit 124 based on the density.

[0098] This allows the light emission pattern information to be corrected in accordance with the density of a group of high-temperature light emitting elements 111. Therefore, the illumination control circuit 123 can determine the current value to be supplied to the light emitting elements 111 in accordance with the corrected light emission pattern information so that the light emitting elements 111 can be illuminated as brightly as possible while remaining at or below the rated temperature.

[0099] Furthermore, the lighting device 10 of Technique 3 in this embodiment is the lighting device 10 described in Technique 2. In this case, the density of the light sources is the number of adjacent groups of high-temperature light sources (light-emitting elements 111) among two or more high-temperature light sources (light-emitting elements 111).

[0100] This allows the light emission pattern information to be corrected according to the number of high-temperature light emitting elements 111 in a group. Therefore, the illumination control circuit 123 can determine the current value to be supplied to the light emitting elements 111 according to the corrected light emission pattern information so that the light emitting elements 111 can be illuminated as brightly as possible while remaining at or below the rated temperature.

[0101] Furthermore, the lighting device 10 of Technology 4 in this embodiment is the lighting device 10 described in any one of Technologies 1 to 3. In this case, when the operating temperature of the light source (light-emitting element 111) indicated in the operating temperature information is a high temperature equal to or higher than the rated temperature and there is a light source (light-emitting element 111) whose emission intensity is equal to or higher than a threshold, the correction unit 124 downscales the light emission pattern information stored in the storage unit 125 and corrects the light emission pattern information by taking into account the light emission intensities of the multiple light sources (light-emitting element 111) based on the downscaled light emission pattern information, and the lighting control circuit 123 determines the current values ​​to be supplied to the multiple light sources (light-emitting element 111) according to the light emission pattern information corrected by the correction unit 124.

[0102] According to this, the resolution of the light emission pattern information can be reduced by performing downscaling processing on the light emission pattern information. Even if only a small portion of the multiple light emitting elements 111 are lit with locally high light emission intensity, the effect is limited, so the temperature of the group is unlikely to rise. Therefore, it is possible to prevent the load on the internal processing of the lighting device 10 from increasing.

[0103] Furthermore, the lighting device 10 of Technique 5 in this embodiment is the lighting device 10 described in any one of Techniques 1 to 4. In this case, when there is a high-temperature light source (light-emitting element 111) whose emission intensity is equal to or greater than a threshold, the correction unit 124 corrects the emission pattern information so that the emission intensities of surrounding light sources (light-emitting elements 111) adjacent to the high-temperature light source (light-emitting element 111) are reduced.

[0104] According to this, when a high-temperature light-emitting element 111 is present, it is possible to correct the light emission pattern information including that of the surrounding light-emitting elements 111. Therefore, it is possible to prevent the operating temperature of the high-temperature light-emitting element 111 and the surrounding light-emitting elements 111 from exceeding the rated temperature.

[0105] Furthermore, the lighting device 10 of Technique 6 in this embodiment is the lighting device 10 described in any one of Techniques 1 to 4. In this case, when there is a high-temperature light source (light-emitting element 111) whose emission intensity is equal to or higher than a threshold, the correction unit 124 corrects the emission pattern information so that the emission intensities of all the light sources (light-emitting elements 111) indicated by the emission pattern information are reduced.

[0106] For example, in the case of light emission pattern information that expresses light shadows such as sunlight filtering through the trees, there is a risk that natural sunlight filtering through the trees cannot be reproduced if the light emission intensities of the multiple light emitting elements 111 are individually corrected. However, according to the present embodiment, it is possible to correct all the light emission intensities indicated by the light emission pattern information, thereby preventing the operating temperature of the light emitting elements 111 from exceeding the rated temperature and reproducing natural sunlight filtering through the trees.

[0107] Furthermore, the lighting device 10 of Technology 7 in this embodiment is the lighting device 10 according to any one of Technologies 1 to 6. In this case, the lighting device 10 includes a temperature acquisition unit 126 that acquires operating temperature information of the plurality of light sources (light-emitting elements 111) and outputs the operating temperature information of the plurality of light sources (light-emitting elements 111) to the correction unit 124.

[0108] This allows the operating temperature information of the plurality of light emitting elements 111 to be acquired, so that the correction unit 124 can more appropriately correct the light emission pattern information by taking the operating temperature information into consideration.

[0109] Furthermore, the lighting control method of technique 8 in this embodiment includes the steps of: correcting, by the correction unit 124, light emission pattern information for lighting up a plurality of light sources (light-emitting elements 111) arranged two-dimensionally and stored in the memory unit 125; determining, by the lighting control circuit 123, a current value to be supplied to the plurality of light sources (light-emitting elements 111); correcting, by the correction unit 124, the light emission pattern information based on the operating temperatures of the plurality of light sources (light-emitting elements 111); and determining, by the lighting control circuit 123, a current value to be supplied to the plurality of light sources (light-emitting elements 111) according to the light emission pattern information corrected by the correction unit 124.

[0110] This lighting control method also provides the same effects as the lighting device 10 described above.

[0111] Furthermore, the program of Technique 9 in this embodiment is a program that enables a computer to execute the lighting control method described in Technique 8.

[0112] This program also provides the same effects as the lighting device 10 described above.

[0113] (Other variations) While the lighting device 10, lighting control method, and program according to the present disclosure have been described above based on the above-mentioned embodiments, the present disclosure is not limited to these embodiments. As long as the modifications do not deviate from the spirit of the present disclosure, various modifications conceivable by those skilled in the art may also be included within the scope of the present disclosure.

[0114] The configuration of an illumination device 200 according to a first modified example of the embodiment will be described below with reference to FIGS.

[0115] Fig. 5 is a schematic configuration diagram of an illumination device 200 according to another modified example. Fig. 5(a) shows a bottom view of the illumination device 200, Fig. 5(b) shows a plan view of the illumination device 200, Fig. 5(c) shows a front view of the illumination device 200, and Fig. 5(d) shows a rear view of the illumination device 200. Fig. 6 is a schematic side view of the illumination device 200 according to another modified example. Fig. 6(a) shows a left side view of the illumination device 200, and Fig. 6(b) shows a right side view of the illumination device 200.

[0116] FIG. 7 is an enlarged schematic configuration diagram of an illumination device 200 according to another modified example. (a) of FIG. 7 shows an enlarged front view of the illumination device 200, and (b) of FIG. 7 shows an enlarged rear view of the illumination device 200. FIG. 8 is an enlarged schematic perspective view of the illumination device 200 according to another modified example. (a) of FIG. 8 shows an enlarged front perspective view of the illumination device 200, and (b) of FIG. 8 shows an enlarged rear perspective view of the illumination device 200. FIG. 9 is a schematic cross-sectional view of the illumination device 200 according to another modified example. FIG. 9 is a cross-sectional view of the illumination device 200 taken along line AA in (c) of FIG. 5.

[0117] The lighting device 200 is configured such that a lamp body 206 is supported on a support base 202 via an arm 201. The support base 202 is formed in a box shape and has a power supply circuit board or a communication board built in. A plurality of horizontal bars 203 are formed in parallel on each of the four side surfaces of the support base 202. These horizontal bars 203 are designed to allow heat generated in the power supply circuit board and the communication board to be released to the outside.

[0118] The rear end of the light body 206 is supported on a support base 202 via an arm 201. The light body 206 is configured to be able to tilt and rotate in the vertical direction (the up and down direction in FIG. 5(c)) with the connection point with the arm 201 as a fulcrum.

[0119] For ease of assembly, the cylindrical body 204 included in the lighting body 206 is assembled by joining or screwing together a first cylindrical body 204a at the front and a second cylindrical body 204b at the rear. Note that, in consideration of cleaning and maintenance of the interior of the cylindrical body 204, the first cylindrical body 204a and the second cylindrical body 204b are configured to be detachable from each other.

[0120] Since heat generated by the group of LED elements (corresponding to the light-emitting elements 111 in the embodiments) arranged inside the lamp body 206 needs to be released to the outside, a plurality of air vent holes 207 for letting in outside air is provided on the front surface of the lamp body 206 in the irradiation direction. Here, the plurality of air vent holes 207 are formed below the lens 205 (corresponding to the optical member in the embodiments). The air flowing in through these plurality of air vent holes 207 passes through the internal space of the lamp body 206 and is exhausted together with the heated air inside the lamp body 206 from a plurality of outside air vents 208 provided on the back surface of the lamp body 206. In this way, the air vent holes 207 and the outside air vents 208 contribute to releasing the heat generated inside the lamp body 206 to the outside.

[0121] It should be noted that although it is not necessarily the case that the outside air that flows in through the plurality of air vent holes 207 is exhausted directly from the plurality of outside air vent holes 208, a cooling effect can be expected compared to the case where no plurality of air vent holes 207 are provided. The air vent holes 207 may be formed in the shape of a plurality of steps that are parallel to the optical axis of the lens 205, or as another example, may be provided on the outer surface of the front irradiation surface of the lighting device 200 in a radial pattern centered on the optical axis of the lens.

[0122] The shape of the air vent holes 207 is not limited to a straight line, and may be a dot-shaped hole or a wavy line. Alternatively, the air vent holes 207 may be jagged as an alternative to a wavy line. The larger the heat dissipation capacity of the various circuit boards built into the lamp body 206, the larger the air vent holes 207 should be, but the dimensions and shape of the air vent holes 207 may be selected appropriately in consideration of the design, which must be narrow enough to prevent insects, dust, etc. from entering from the outside.

[0123] Next, the configuration of another illumination device 200a according to another modification will be described with reference to FIGS.

[0124] FIG. 10 is a schematic configuration diagram of another lighting device 200a according to another modified example. (a) of FIG. 10 shows a front view of the lighting device 200a, and (b) of FIG. 10 shows an enlarged front view of the lighting device 200a. FIG. 11 is a schematic perspective view of another lighting device 200a according to another modified example. FIG. 12 is a schematic cross-sectional view of another lighting device 200a according to another modified example. FIG. 12 is a cross-sectional view of the lighting device 200a taken along line BB in (a) of FIG. 10. FIG. 13 is another schematic cross-sectional view of the lighting device according to another modified example. FIG. 13 is a cross-sectional view of the lighting device 200a taken along line CC in (a) of FIG. 10.

[0125] Another lighting device 200a according to another modification has the same configuration as the lighting device 200 according to the other modification, except that the lighting body 206 does not have the plurality of air circulation holes 207. Therefore, a description of the lighting device 200a will be omitted here.

[0126] Furthermore, the lighting device 10, the lighting control method, and the program according to the above-described embodiment may execute either one of the flowcharts in FIG. 4A and FIG. 4B, or may execute both.

[0127] Furthermore, in the lighting device 10, the lighting control method, and the program according to the above-described embodiments, whether the correction unit 124 performs correction by multiplying the light emission intensity of a group of light-emitting elements 111 with high temperatures by a coefficient less than 1 (first pattern) or whether the correction unit 124 performs correction by multiplying the light emission intensities of all light-emitting elements 111 indicated by the light emission pattern information by a coefficient less than 1 (second pattern) may be appropriately determined depending on the image indicated by the light emission pattern information. For example, if the image indicated by the light emission pattern information is natural sunlight filtering through the trees, the correction unit 124 may multiply the light emission intensities of all light-emitting elements 111 indicated by the light emission pattern information by a coefficient less than 1 to achieve an image with overall brightness and darkness that does not appear unnatural. On the other hand, if the image indicated by the light emission pattern information is a graphic (e.g., FIG. 3), the correction unit 124 may multiply the light emission intensity of a group of light-emitting elements 111 with high temperatures by a coefficient less than 1 to prevent the graphic from appearing unnatural. A processing unit having artificial intelligence may determine whether the image indicated by the light emission pattern information should be corrected using the first pattern or the second pattern. Note that the user may be allowed to select whether to perform correction using the first pattern or the second pattern. In other words, the user may be able to select, via the terminal device, whether to perform correction using the first pattern or the second pattern.

[0128] Furthermore, in the lighting device 10, the lighting control method, and the program according to the above-described embodiment, the correction unit 124 may use a machine learning model that has been trained to output whether or not to correct the light emission pattern information.

[0129] In the lighting device, lighting control method, and program according to the above-described embodiments, the division of functional blocks in the block diagram is merely an example, and multiple functional blocks may be realized as a single functional block, one functional block may be divided into multiple blocks, or some functions may be transferred to other functional blocks. Furthermore, the functions of multiple functional blocks having similar functions may be processed in parallel or in a time-sharing manner by a single piece of hardware or software.

[0130] The order in which the steps in the flowchart are executed is merely an example for specifically explaining the present disclosure, and an order other than the above may be used. Also, some of the steps may be executed simultaneously (in parallel) with other steps.

[0131] In addition, this disclosure also includes forms obtained by making various modifications to the above embodiments that a person skilled in the art would think of, and forms realized by arbitrarily combining the components and functions of the embodiments within the scope that does not deviate from the intent of this disclosure. [Explanation of symbols]

[0132] 10, 200, 200a lighting equipment 111 Light-emitting element (light source) 123 Lighting control circuit 124 Correction Unit 125 Storage section

Claims

1. A plurality of light sources arranged two-dimensionally; a storage unit that stores light emission pattern information for lighting the plurality of light sources; a correction unit that corrects the light emission pattern information; a lighting control circuit that determines a current value to be supplied to the plurality of light sources; the correction unit corrects the light emission pattern information based on operating temperature information of the plurality of light sources; The lighting control circuit determines current values ​​to be supplied to the plurality of light sources in accordance with the light emission pattern information corrected by the correction unit. Lighting equipment.

2. When the light sources are turned on based on the light emission pattern information, if the operating temperatures of the light sources indicated in the operating temperature information are high temperatures equal to or higher than a rated temperature and there are light sources with high temperatures whose light emission intensity is equal to or higher than a threshold, the correction unit identifies a density of the high-temperature light sources and corrects the light emission pattern information based on the identified density, The lighting control circuit determines a current value to be supplied to the plurality of light sources in accordance with the light emission pattern information corrected by the correction unit based on the density. The lighting device according to claim 1 .

3. The density of the light source is the number of adjacent groups of high-temperature light sources among two or more high-temperature light sources.

3. The lighting device according to claim 2.

4. when the operating temperature of the light source indicated in the operating temperature information is a high temperature equal to or higher than a rated temperature and there is a light source whose emission intensity is equal to or higher than a threshold, the correction unit downscales the emission pattern information stored in the storage unit, and corrects the emission pattern information by taking into account the emission intensities of the plurality of light sources based on the downscaled emission pattern information; The lighting control circuit determines current values ​​to be supplied to the plurality of light sources in accordance with the light emission pattern information after the correction unit performs the downscale processing. The lighting device according to claim 1 .

5. When there is a light source with a high temperature whose emission intensity is equal to or greater than a threshold, the correction unit corrects the emission pattern information so that the emission intensities of a group of light sources with high temperatures adjacent to the light source with a high temperature are reduced. The lighting device according to any one of claims 1 to 4.

6. The correction unit corrects the light emission pattern information so that the light emission intensities of all the light sources indicated by the light emission pattern information are reduced when there is a light source with a high temperature whose light emission intensity is equal to or greater than a threshold. The lighting device according to any one of claims 1 to 4.

7. a temperature acquisition unit that acquires the operating temperature information of the plurality of light sources and outputs the operating temperature information of the plurality of light sources to the correction unit; The lighting device according to any one of claims 1 to 4.

8. a correction unit correcting light emission pattern information for lighting a plurality of light sources arranged two-dimensionally, the light emission pattern information being stored in a storage unit; a lighting control circuit determining current values ​​to be supplied to the plurality of light sources; the correction unit correcting the light emission pattern information based on the operating temperatures of the plurality of light sources; The lighting control circuit determines current values ​​to be supplied to the plurality of light sources in accordance with the light emission pattern information corrected by the correction unit. Lighting control methods.

9. A computer capable of executing the lighting control method according to claim 8. program.

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