Control method of lighting device, light distribution lens and lighting device

Abstract

The present application relates to a control method for a lighting device, a light distribution lens, and a lighting device. The light distribution lens of the light-emitting part of the lighting device is provided with a first free-form surface and a second free-form surface that are centrosymmetric with respect to the optical axis. The first free-form surface is used to make the light emitted by the light source of the light-emitting part enter the light distribution lens, and the second free-form surface is used to make the angle formed by the outgoing light of the light distribution lens and the horizontal plane be at least not less than a preset angle. The method includes: configuring the light emitted by the light source through the light distribution lens to satisfy a preset light distribution curve, and making the illuminance formed on the ceiling change in an annular gradient from bright to dark from the center of the ceiling to the edge of the ceiling through the preset light distribution curve. Using this method makes the indoor environment closer to the natural light environment and makes the spatial distribution softer.

Description

Technical Field

[0001] The present application relates to the technical field of lighting, and in particular to a control method for a lighting device, a light distribution lens, and a lighting device. Background Art

[0002] With the wide application of human-centered lighting, the concept of designing lighting methods centered on people's needs and experiences has led to the emergence of lamps with different lighting concepts. The aim is to create a lighting environment that meets the physiological and psychological needs of the human body, and to optimize the lighting environment through scientific evidence to meet people's needs in work, life, and study. Human-centered lighting adjusts the color temperature, spectrum, illuminance, light distribution, etc. of light to meet people's visual, physiological, and psychological needs in different scenarios.

[0003] Among the information people obtain through vision, 80% comes from vision caused by light. The establishment of the indoor light environment involves the distribution of light, and the light distribution can affect people's visual experience and psychological feelings. Among them, the distribution and state of sunlight also vary at different times, but it always has a positive impact on people's physical and mental health. Therefore, further research on sunlight is beneficial to the establishment of the indoor light environment and making it closer to the natural environment.

[0004] However, the inventors found that the light emitted by the lighting devices in the traditional technology is often not distributed naturally enough in the indoor space, which is not conducive to the lighting devices in the traditional technology conforming to the concept of human-centered lighting. Summary of the Invention

[0005] Based on this, in view of the above technical problems, it is necessary to provide a control method for a lighting device, a light distribution lens, and a lighting device that can make the light emitted by the lighting device more closely distributed to the natural environment in the indoor space.

[0006] In a first aspect, the present application provides a control method for a lighting device. The light-emitting part of the lighting device is used to irradiate the ceiling of the indoor space to achieve indirect lighting. The light distribution lens of the light-emitting part is provided with a first free-form surface and a second free-form surface that are centrosymmetric with respect to the optical axis. The first free-form surface is used to make the light rays emitted by the light source of the light-emitting part enter the light distribution lens, and the second free-form surface is used to make the angle formed by the outgoing light rays of the light distribution lens and the horizontal plane be at least not less than a preset angle. The first free-form surface and the second free-form surface as a whole protrude towards the ceiling, and the part of the second free-form surface close to the ceiling is a flat surface parallel to the ceiling. The method includes:

[0007] The light rays emitted by the light source are configured by the light distribution lens to satisfy a preset light distribution curve. Through the preset light distribution curve, the illuminance formed on the ceiling changes in an annular gradient from bright to dark from the center of the ceiling to the edge of the ceiling.

[0008] In one embodiment, the method further includes:

[0009] Through the preset light distribution curve, a plurality of annular isophotes centered on the center of the ceiling are formed on the ceiling, and the size of the annular isophote from the center of the ceiling is inversely proportional to the illuminance ratio corresponding to the annular isophote.

[0010] In one embodiment, when the shape of the ceiling is square, among the plurality of annular isophotes, the annular isophote farthest from the center of the ceiling is inscribed in the edge of the ceiling.

[0011] In one embodiment, the method further includes:

[0012] Controlling to maintain a first distance between the light emitting part and the ceiling, so as to form a pre-configured first light spot on the wall of the indoor space through the preset light distribution curve;

[0013] Wherein, the first light spot is tangent to the junction between the ceiling and the wall, and the first light spot is used to form a closed-loop isophote on the wall.

[0014] In one embodiment, the illuminance of the first light spot is not less than 50% of the illuminance at the center of the ceiling.

[0015] In one embodiment, the method further includes:

[0016] Controlling to maintain a second distance between the light emitting part and the ceiling, so as to form a pre-configured second light spot on the wall of the indoor space through the preset light distribution curve:

[0017] Wherein, the second distance is less than the first distance, at least a part of the second light spot is cut off by the junction between the ceiling and the wall, and the second light spot is used to form an open-loop isophote on the wall.

[0018] In one embodiment, the method further includes:

[0019] Controlling to maintain a third distance between the light emitting part and the ceiling, so as to form a pre-configured third light spot on the wall of the indoor space through the preset light distribution curve:

[0020] Wherein, the third distance is less than the second distance, the portion of the third light spot cut off by the junction between the ceiling and the wall is greater than the portion of the second light spot cut off by the junction between the ceiling and the wall, and the third light spot is used to form an isophote line on the wall that is not closed and tends to a point.

[0021] In one embodiment, the method further includes:

[0022] Controlling the distance between the light-emitting part and the ceiling to be within a preset distance range, so that the preset light distribution curve forms an isophote line distribution on the wall of the indoor space that decreases in an orderly single direction from the top of the wall to the bottom of the wall.

[0023] In one embodiment, the method further includes:

[0024] Controlling the distance between the light-emitting part and the ceiling not to be within the preset distance range, so that the preset light distribution curve forms an isophote line distribution on the wall of the indoor space that decreases in a two-way trend towards the top and bottom of the wall respectively.

[0025] In one embodiment, the method further includes:

[0026] Through the preset light distribution curve, making the illuminance formed on the ceiling change in a circular gradient from bright to dark from the center of the ceiling to the edge of the ceiling, and the brightness at the edge position of the ceiling is 10% of the brightness at the center position of the ceiling.

[0027] In one embodiment, the angle formed by the outgoing light of the light distribution lens and the horizontal plane is at least not less than 5°.

[0028] In one embodiment, the method further includes:

[0029] By controlling the color temperature change of the light-emitting part, making the color temperature of the light spot formed on the wall of the indoor space be between 2500K and 3000K.

[0030] In a second aspect, the present application further provides a light distribution lens, which is provided with a first free-form surface and a second free-form surface that are centrosymmetric with respect to the optical axis;

[0031] The first free-form surface is used to make the light emitted by the light source enter the light distribution lens;

[0032] The second free-form surface is used to make the angle formed by the outgoing light of the light distribution lens and the horizontal plane be at least not less than a preset angle;

[0033] The first free-form surface and the second free-form surface protrude towards the illumination surface as a whole, and a part of the second free-form surface close to the illumination surface is a flat surface parallel to the illumination surface.

[0034] In a third aspect, the present application provides an illumination device, including: implementing the control method of the illumination device as described in the first aspect or any possible implementation manner of the first aspect.

[0035] For the above-mentioned control method of the illumination device, the light distribution lens, and the illumination device, the light-emitting part of the illumination device is used to irradiate the ceiling of the indoor space to achieve indirect illumination. The light distribution lens of the light-emitting part is provided with a first free-form surface and a second free-form surface that are centrosymmetric with respect to the optical axis. The first free-form surface is used to make the light emitted by the light source of the light-emitting part enter the interior of the light distribution lens, and the second free-form surface is used to make the included angle formed by the outgoing light of the light distribution lens and the horizontal plane be at least not less than a preset angle. The first free-form surface and the second free-form surface protrude towards the ceiling as a whole, and a part of the second free-form surface close to the ceiling is a flat surface parallel to the ceiling. The method includes: configuring the light emitted by the light source through the light distribution lens to satisfy a preset light distribution curve, and through the preset light distribution curve, making the illuminance formed on the ceiling change in a ring gradient from bright to dark from the center of the ceiling to the edge of the ceiling, which can make the light distribution characteristics of the light emitted by the illumination device in the indoor space closer to the light distribution characteristics in the natural environment, so that the illumination environment in the indoor space is closer to the natural light environment, making the space distribution softer, realizing the creation of a warm, comfortable and more natural visual feeling in the indoor space, conforming to the concept of human-centered lighting, and further developing human-centered lighting. Description of the Drawings

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following will briefly introduce the drawings required for use in the description of the embodiments of the present application or related technologies. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0037] Figure 1 It is a schematic flowchart of a control method of an illumination device in an embodiment;

[0038] Figure 2 It is a schematic cross-sectional view of a light distribution lens in an embodiment;

[0039] Figure 3 It is a schematic diagram of a light distribution curve formed by a light source passing through a light distribution lens in an embodiment;

[0040] Figure 4It is the isolux diagram of the wall light spot in Embodiment 1 of the present application;

[0041] Figure 5 It is the isolux diagram of the ceiling surface in Embodiment 1 of the present application;

[0042] Figure 6 It is the isolux diagram of the wall light spot in Embodiment 2 of the present application;

[0043] Figure 7 It is the isolux diagram of the ceiling surface in Embodiment 2 of the present application;

[0044] Figure 8 It is the isolux diagram of the wall light spot in Embodiment 3 of the present application;

[0045] Figure 9 It is the isolux diagram of the ceiling surface in Embodiment 3 of the present application;

[0046] Figure 10 It is the isolux diagram of the wall in Comparative Example 1 of the present application;

[0047] Figure 11 It is the isolux diagram of the ceiling surface in Comparative Example 1 of the present application;

[0048] Figure 12 It is the isolux diagram of the wall in Comparative Example 2 of the present application;

[0049] Figure 13 It is the isolux diagram of the ceiling surface in Comparative Example 2 of the present application;

[0050] Figure 14 It is the corresponding wall illuminance distribution trend diagram when the link mechanism length of the lighting device is between 60 and 20 cm in an embodiment;

[0051] Figure 15 It is the corresponding wall illuminance distribution trend diagram when the link mechanism length of the lighting device is higher than 60 cm in an embodiment;

[0052] Figure 16 It is the corresponding wall illuminance distribution trend diagram when the link mechanism length of the lighting device is lower than 20 cm in an embodiment. Detailed implementation manners

[0053] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the relevant drawings. Embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0055] It will be understood that the terms "first", "second", etc. used in this application may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.

[0056] Spatial relationship terms such as "under", "below", "beneath", "underneath", "above", "over", etc. may be used herein to describe the relationship of one element or feature shown in the figure to other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relationship terms also include different orientations of the device during use and operation. For example, if the device in the drawing is flipped, an element or feature described as "under other elements" or "beneath them" or "under it" will be oriented "above" the other elements or features. Thus, the exemplary terms "under" and "beneath" can include both upward and downward orientations. In addition, the device may also include additional orientations (such as rotating 90 degrees or other orientations), and the spatial descriptors used herein are accordingly interpreted.

[0057] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element or connected to the other element through an intermediate element. In addition, in the following embodiments, "connection", if there is a transfer of electrical signals or data between the connected objects, should be understood as "electrical connection", "communication connection", etc.

[0058] As used herein, the singular forms "a", "an" and "the" may also include the plural forms unless the context clearly dictates otherwise. It should also be understood that the terms "comprise / include" or "have" etc. specify the presence of the stated features, wholes, steps, operations, components, parts or combinations thereof, but do not preclude the presence or addition of one or more other features, wholes, steps, operations, components, parts or combinations thereof.

[0059] As described in the background art, among the information obtained by people through vision, 80% comes from vision caused by light. The establishment of the indoor light environment involves the distribution of light, and the distribution of light can affect people's visual experience and psychological feelings. Among them, the sun's light has different distributions and states at different times, but it always has a positive impact on people's physical and mental health. Therefore, further research on sunlight is beneficial to the establishment of the indoor light environment and is closer to the natural environment.

[0060] For the above reasons, starting from studying the state and distribution of sunlight in the natural environment, the inventor configures the state characteristics and light distribution characteristics of the light emitted by the lighting device in the indoor space to meet preset conditions, making the indoor space characteristics close to the natural environment characteristics, such as Figure 1 As shown, the present application provides a control method for a lighting device; the light-emitting part of the lighting device is used to irradiate the ceiling of the indoor space to achieve indirect lighting.

[0061] Among them, as Figure 2 As shown, the light distribution lens 210 of the light-emitting part 200 is provided with a first free surface 211 and a second free surface 212 that are centrosymmetric with respect to the optical axis. The first free surface 211 is used to make the light rays emitted by the light source 220 of the light-emitting part enter the inside of the light distribution lens 210, and the second free surface 212 is used to make the angle formed by the outgoing light rays of the light distribution lens 210 and the horizontal plane be at least not less than a preset angle. The first free surface 211 and the second free surface 212 protrude towards the ceiling as a whole, and the part 213 of the second free surface 212 close to the ceiling is a flat surface parallel to the ceiling.

[0062] In practical applications, the angle formed by the outgoing light rays of the light distribution lens 210 and the horizontal plane is at least not less than 5°.

[0063] In practical applications, the first free surface 211 is formed by rotating a first curve around the optical axis of the light distribution lens 210 and forming a first groove on the lens; the second free surface 212 is formed by rotating a second curve around the optical axis of the light distribution lens 210; the curvature of the first curve is different from the curvature of the second curve; more specifically, the bending degree of the first curve is greater than the bending degree of the second curve, and at least a part of the second curve is a straight line.

[0064] Specifically, through the specific arc shapes of the first free surface 211 and the second free surface 212, the light rays emitted by the light source 220 can be refracted and deflected by an angle, thereby determining the direction of the outgoing light rays of the light distribution lens 210. As Figure 2 As shown, the incident light rays are refracted by the first free surface 211 to the second free surface 212, and the second free surface 212 performs a secondary refraction and deflection by an angle, so that the final outgoing light rays form an angle of 5° with the horizontal. Among them, the parts of the first free surface 211 and the second free surface 212 close to the ceiling can both be set to a shape with a flat top, so that the light rays are supplemented upwards after secondary refraction. The light source 220 can form a light distribution curve as Figure 3 As shown, that is, the preset light distribution curve in the following text. By this preset light distribution curve, the state characteristics and light distribution characteristics of the light emitted by the lighting device in the indoor space are configured to meet the preset conditions, making the indoor space characteristics close to the natural environment characteristics.

[0065] Specifically, the control method of the lighting device at least includes the following steps:

[0066] Step S100: Configure the light emitted by the light source through the light distribution lens to meet a preset light distribution curve. Through the preset light distribution curve, the illuminance formed on the ceiling changes in an annular gradient from bright to dark from the center of the ceiling to the edge of the ceiling. Among them, the relative value of the center of the ceiling is 1, and the relative value of the edge of the ceiling is 0.1.

[0067] Optionally, the control method of the above lighting device further includes: forming multiple annular isophotes centered on the center of the ceiling through the preset light distribution curve, and the size of the annular isophote from the center of the ceiling is inversely proportional to the illuminance ratio corresponding to the annular isophote.

[0068] Among them, when the shape of the ceiling is square, among the multiple annular isophotes, the annular isophote farthest from the center of the ceiling is inscribed in the edge of the ceiling.

[0069] For the convenience of understanding by those skilled in the art, assuming that the size of the indoor space is 3m×3m×3m (length, width, and height), the ceiling surface of the ceiling can be divided into each isophote line as l 1 to l 10 , where the distance between two adjacent annular isophotes can be 0.15m; that is, the distances of each isophote line from the center point O of the ceiling surface are 0.15m, 0.3m, 0.45m......1.5m respectively. Among them, among the multiple annular isophotes, the annular isophote farthest from the center of the ceiling (i.e., the l 1 isophote line) is inscribed in the edge of the square ceiling surface. In practical applications, the lighting device is suspended at the central position of the ceiling through a linking mechanism. When the length of the linking mechanism of the lighting device is 60cm, the annular illuminance gradient ratio of the ceiling is as shown in Table 1 below. 10 It can be seen that the size of the annular isophote from the center of the ceiling is inversely proportional to the illuminance ratio corresponding to the annular isophote, that is, the larger the size of the annular isophote from the center of the ceiling, the smaller the illuminance ratio corresponding to the annular isophote. In this way, the light distribution characteristics of the light emitted by the lighting device on the ceiling of the indoor space can be made closer to the light distribution characteristics in the natural environment. 10 Table 1

[0070] Table 1

[0071]

[0072] It can be seen that the size of the annular isophote from the center of the ceiling is inversely proportional to the illuminance ratio corresponding to the annular isophote, that is, the larger the size of the annular isophote from the center of the ceiling, the smaller the illuminance ratio corresponding to the annular isophote. In this way, the light distribution characteristics of the light emitted by the lighting device on the ceiling of the indoor space can be made closer to the light distribution characteristics in the natural environment.

[0073] The technical solution of this embodiment provides a control method for a lighting device. The light-emitting part of the lighting device is used to irradiate the ceiling of the indoor space to achieve indirect lighting. The light distribution lens of the light-emitting part is provided with a first free-form surface and a second free-form surface that are centrosymmetric with respect to the optical axis. The first free-form surface is used to make the light emitted by the light source of the light-emitting part enter the interior of the light distribution lens, and the second free-form surface is used to make the angle formed by the outgoing light of the light distribution lens and the horizontal plane be at least not less than a preset angle. The first free-form surface and the second free-form surface as a whole protrude towards the ceiling, and the part of the second free-form surface close to the ceiling is a flat surface parallel to the ceiling. The method includes: configuring the light emitted by the light source through the light distribution lens to satisfy a preset light distribution curve, and through the preset light distribution curve, making the illuminance formed on the ceiling change in a circular gradient from bright to dark from the center of the ceiling to the edge of the ceiling, which can make the light distribution characteristics of the lighting device in the indoor space closer to the light distribution characteristics in the natural environment, so that the lighting environment in the indoor space is closer to the natural light environment, making the space distribution softer, realizing the creation of a warm, comfortable and more natural visual sense in the indoor space, conforming to the concept of human-centered lighting, and further developing human-centered lighting.

[0074] In an exemplary embodiment, the method further includes: controlling the light-emitting part to maintain a first distance from the ceiling, so as to form a pre-configured first light spot on the wall of the indoor space through a preset light distribution curve; wherein, the first light spot is tangent to the junction between the ceiling and the wall, and the first light spot is used to form a closed-loop equal-illuminance line on the wall.

[0075] In specific implementation, the lighting device is suspended at the central position of the ceiling through a linking mechanism, and the linking mechanism can be set as a length-adjustable mechanism; thus, the distance between the light-emitting part and the ceiling can be controlled by controlling the length of the linking mechanism. Specifically, by controlling the length of the linking mechanism of the lighting device to be h1, the light-emitting part is made to maintain a first distance from the ceiling. When the light-emitting part maintains a first distance from the ceiling, the lighting device can form a pre-configured first light spot G on the wall of the indoor space through a preset light distribution curve; wherein, the first light spot is tangent to the junction between the ceiling and the wall, and the first light spot is used to form a closed-loop equal-illuminance line on the wall. Optionally, the illuminance of the first light spot is not less than 50% of the illuminance at the center of the ceiling. For the convenience of understanding by those skilled in the art, please refer to Figure 4 , Figure 4 as a reference diagram of the shape of the first light spot.

[0076] From Figure 4It can be seen that the lighting device of this embodiment maintains a first distance between the light-emitting part and the ceiling by controlling the length of the linkage mechanism, thereby realizing the formation of a pre-configured first light spot on the wall of the indoor space. The first light spot is tangent to the junction between the ceiling and the wall, and causes the wall to form a closed-loop equal illuminance line. The first light spot is the key to creating a lighting effect close to the natural visual sense in the indoor space. It makes the light distribution characteristics of the light emitted by the lighting device in the indoor space closer to the light distribution characteristics in the natural environment, relaxes the eyes of people in the indoor space, and conforms to the concept of human-centered lighting.

[0077] In an exemplary embodiment, the method further includes: controlling to maintain a second distance between the light-emitting part and the ceiling, so as to form a pre-configured second light spot on the wall of the indoor space through a preset light distribution curve: wherein, the second distance is less than the first distance, and at least a part of the second light spot is cut off by the junction between the ceiling and the wall, and the second light spot is used to make the wall form an open-loop equal illuminance line.

[0078] In specific implementation, by controlling the length of the linkage mechanism of the lighting device to be h2 (h2 < h1), a second distance (the second distance is less than the first distance) is maintained between the light-emitting part and the ceiling. When the second distance is maintained between the light-emitting part and the ceiling, the lighting device can form a pre-configured second light spot on the wall of the indoor space through a preset light distribution curve; at least a part of the second light spot is cut off by the junction between the ceiling and the wall. Specifically, a very small part of the second light spot can be cut off by the junction between the ceiling and the wall, so that the second light spot forms an open-loop equal illuminance line on the wall. For the convenience of understanding by those skilled in the art, please refer to Figure 6 , Figure 6 as the shape reference diagram of the second light spot.

[0079] In an exemplary embodiment, the method further includes: controlling to maintain a third distance between the light-emitting part and the ceiling, so as to form a pre-configured third light spot on the wall of the indoor space through a preset light distribution curve: wherein, the third distance is less than the second distance, and the part of the third light spot cut off by the junction between the ceiling and the wall is greater than the part of the second light spot cut off by the junction between the ceiling and the wall, and the third light spot is used to make the wall form an open-loop and point-tending equal illuminance line.

[0080] In a specific implementation, by controlling the length of the lighting device linkage mechanism to be h3 (h3 < h2), a third distance (the third distance is less than the second distance) is maintained between the light-emitting part and the ceiling. When the third distance is maintained between the light-emitting part and the ceiling, the lighting device can form a pre-configured third light spot on the wall of the indoor space through a preset light distribution curve; the part of the third light spot cut off by the junction between the ceiling and the wall is larger than the part of the second light spot cut off by the junction between the ceiling and the wall. Specifically, a very large part of the third light spot can be cut off by the junction between the ceiling and the wall, so that the third light spot forms an isophote line on the wall that is not closed and tends to be a point. For the convenience of those skilled in the art to understand, please refer to Figure 8 , Figure 8 which is a reference diagram of the shape of the third light spot.

[0081] In an exemplary embodiment, the method further includes: controlling the distance between the light-emitting part and the ceiling to be within a preset distance range, so that the preset light distribution curve forms an isophote line distribution on the wall of the indoor space that decreases in an orderly single direction from the top of the wall to the bottom of the wall.

[0082] In a specific implementation, when the spatial size of the indoor space is 3m × 3m × 3m (length, width, and height), control the length of the lighting device linkage mechanism to be between 25 - 60 cm, so that the distance between the light-emitting part and the ceiling is within a preset distance range, and the distribution trend of the isophote line on the wall is as Figure 14 shown. From Figure 14 it can be seen that the isophote line decreases in a single direction from the top of the wall to the bottom of the wall.

[0083] In an exemplary embodiment, the method further includes: controlling the distance between the light-emitting part and the ceiling not to be within a preset distance range, so that the preset light distribution curve forms an isophote line distribution on the wall of the indoor space that decreases in a two-way manner towards the top and bottom of the wall respectively.

[0084] In a specific implementation, following the above example, when the length of the lighting device linkage mechanism is higher than 60 cm, the distribution trend of the isophote line on the wall is as Figure 15 shown. From Figure 15 it can be seen that the isophote line decreases in a two-way manner towards the top and bottom of the wall. When the length of the lighting device linkage mechanism is lower than 20 cm, the distribution trend of the isophote line on the wall is as Figure 16 shown. From Figure 16 it can be seen that the isophote line decreases in a two-way manner towards the top and bottom of the wall.

[0085] In practical applications, the ceiling gradient feature and the wall gradient feature formed by the lighting device in the indoor space can be specifically generated by the Figure 3 shown light distribution curve.

[0086] For example, when the spatial dimensions of an indoor space are 3m × 3m × 3m (length × width × height), the light source irradiates the ceiling through this light distribution lens, and the light intensity gradually increases in a certain proportion. According to the light intensity formula:

[0087]

[0088] where I represents the light intensity, d represents the distance from the light source to the surface, E represents the normal illuminance at the surface position, the value of n can be set according to the lighting environment and / or the preferences of the occupants, the value of n is set to any value greater than or equal to 1 and less than or equal to 3, and θ represents the incident angle of the light distribution curve on the surface;

[0089] It can be calculated that the brightness from the center point of the ceiling to the edge of the ceiling shows a gradient decrease as shown in Table 1; since both the light-emitting source and the receiving surface are centrosymmetric with respect to the polar axis, a circular gradient change from bright to dark is formed from the center point of the ceiling to the edge.

[0090] When the beam projection angle is 0°, the irradiation position is the center of the ceiling, making the center of the ceiling the place with the maximum brightness on the ceiling surface. When the beam projection angle is 78°, the light intensity reaches the maximum peak value, and this maximum light intensity is about 25 times that when the beam projection angle is 0°. According to the light intensity formula:

[0091]

[0092] where I represents the light intensity, d represents the distance from the light source to the surface, E represents the normal illuminance at the surface position, the value of n can be set according to the lighting environment and / or the preferences of the occupants, the value of n is set to any value greater than or equal to 1 and less than or equal to 3, and θ represents the incident angle of the light distribution curve on the surface;

[0093] It can be calculated that the ratio of the brightness at the edge position of the ceiling to the brightness at the center position of the ceiling is 0.5.

[0094] When the beam projection angle is 78°, the irradiation position is the junction of the edge of the ceiling and the wall, causing a light spot to appear at the corner. In the range of the beam projection angle from 78° to 90°, the irradiation position is the wall, and the light intensity decreases in a certain proportion, causing an isophote line that decreases unidirectionally from top to bottom to appear on the wall.

[0095] In an exemplary embodiment, the method further includes: by controlling the color temperature change of the light-emitting part, making the color temperature of the light spot formed on the wall of the indoor space be between 2500K and 3000K.

[0096] In specific implementation, the color temperature change of the light source in the light-emitting part can be controlled to make the color temperature of the light spot formed on the wall of the indoor space be between 2500K and 3000K. In practical applications, the lighting device can obtain the current time or the local sunrise and sunset time, and control the color temperature of the light-emitting part to change with the local sunrise to sunset time, simulating the color temperature scenario of the sun rising and setting.

[0097] In the technical solution of this embodiment, by controlling the color temperature of the light spot formed by the lighting device on the wall to be between 2500K and 3000K, the lighting device can simulate the color temperature scenario of the sun rising and setting, making the lighting environment in the indoor space closer to the natural light environment, and achieving a warm, comfortable and more natural visual feeling in the indoor space.

[0098] A light distribution lens is provided with a first free surface and a second free surface that are centrosymmetric with respect to the optical axis; the first free surface is used to make the light emitted by the light source enter the interior of the light distribution lens; the second free surface is used to make the angle formed by the emitted light of the light distribution lens and the horizontal plane be at least not less than a preset angle; the first free surface and the second free surface as a whole protrude towards the illumination surface, and the part of the second free surface close to the illumination surface is a flat surface parallel to the illumination surface.

[0099] It should be noted that the above limitations of the light distribution lens can be referred to in the above text and will not be elaborated here.

[0100] The light distribution lens of this embodiment is provided with a first free surface and a second free surface that are centrosymmetric with respect to the optical axis; the first free surface is used to make the light emitted by the light source enter the interior of the light distribution lens; the second free surface is used to make the angle formed by the emitted light of the light distribution lens and the horizontal plane be at least not less than a preset angle; the first free surface and the second free surface as a whole protrude towards the illumination surface, and the part of the second free surface close to the illumination surface is a flat surface parallel to the illumination surface; through this light distribution lens, the light emitted by the light source is configured to satisfy a preset light distribution curve, and through the preset light distribution curve, the illuminance formed on the ceiling changes in a circular gradient from bright to dark from the center of the ceiling to the edge of the ceiling.

[0101] A lighting device is used to implement the control method of the lighting device as described above.

[0102] It should be noted that the further limitations of the above lighting device can be referred to in the above text and will not be elaborated here.

[0103] The lighting device of this embodiment, the light-emitting part of the lighting device is used to irradiate the ceiling of the indoor space to achieve indirect lighting. The light distribution lens of the light-emitting part is provided with a first free-form surface and a second free-form surface that are centrosymmetric with respect to the optical axis. The first free-form surface is used to make the light emitted by the light source of the light-emitting part enter the interior of the light distribution lens, and the second free-form surface is used to make the angle formed by the outgoing light of the light distribution lens and the horizontal plane be at least not less than a preset angle. The first free-form surface and the second free-form surface as a whole protrude towards the ceiling, and the part of the second free-form surface close to the ceiling is a flat surface parallel to the ceiling. The method includes: configuring the light emitted by the light source through the light distribution lens to meet a preset light distribution curve, and through the preset light distribution curve, making the illuminance formed on the ceiling change in a ring-shaped gradient from bright to dark from the center of the ceiling to the edge of the ceiling, which can make the light distribution characteristics of the light emitted by the lighting device in the indoor space closer to the light distribution characteristics in the natural environment, so that the lighting environment in the indoor space is closer to the natural light environment, making the space distribution softer, realizing the creation of a warm, comfortable and more natural visual feeling in the indoor space, conforming to the concept of human-centered lighting, and further developing human-centered lighting.

[0104] The following are some exemplary embodiments of the present application:

[0105] Embodiment 1

[0106] An indoor lighting device includes: the overall output luminous flux is 10,000 lm; the color temperature of the whole lamp output is 3000K; the lamp pole of the linking mechanism has a length of h1 = 60 cm.

[0107] In the specific implementation process, the lighting device can be installed in the central area of the ceiling surface in a typical indoor space with dimensions of 3m×3m×3m (length×width×height), a ceiling reflectivity of 70%, a wall reflectivity of 50%, and a floor reflectivity of 20%. The lighting device controls the formation of a ring-shaped illuminance gradient change from bright to dark from the central position to the edge position of the ceiling, which conforms to the proportional decrease shown in Table 1. Make the light spot G (i.e., the closed-loop isophote) formed on the wall tangent to the junction of the ceiling edge, and the illuminance of the wall light spot G is not less than 50% of the illuminance at the center of the ceiling surface.

[0108] From this, the isophote distribution characteristics of the wall light spot are as Figure 4 shown. From Figure 4 it can be seen that the isophotes are distributed in an orderly unidirectional decreasing trend from the top of the wall to the bottom of the wall, and the illuminance of the wall light spot G is 1150 lux. The isophote distribution of the ceiling surface is as Figure 5 shown. Figure 5 The light-emitting part has been shown. According to the illuminance distribution map of the ceiling surface, the ceiling ring-shaped illuminance gradient ratio is shown in Table 2, and the illuminance at the center of the ceiling surface is 1330 lux.

[0109] Table 2

[0110]

[0111] Example 2

[0112] An indoor lighting device includes: the overall output luminous flux is 10,000 lm; the color temperature of the whole lamp output is 2500K; the connecting mechanism has a lamp post with a length of h2 = 59 cm.

[0113] In the specific implementation process, the lighting device can be installed in the central area of the ceiling surface in a typical indoor space with dimensions of 3m×3m×3m (length, width, and height), a ceiling reflectivity of 70%, a wall reflectivity of 50%, and a floor reflectivity of 20%. The lighting device controls the ceiling to form a circular illuminance gradient change from bright to dark from the central position to the edge position. The top of the light spot G formed on the wall is cut off by a very small part at the junction of the ceiling and the wall, and the light spot G changes from the original closed-loop equal illuminance line to an open-loop equal illuminance line.

[0114] The equal illuminance line distribution characteristics of the wall light spot are obtained as Figure 6 shown. From Figure 6 it can be seen that the equal illuminance lines are distributed in an orderly single-direction decreasing trend from the top of the wall to the bottom of the wall. The equal illuminance line distribution of the ceiling surface is as Figure 7 shown, Figure 7 and the light-emitting part has been shown.

[0115] Example 3

[0116] An indoor lighting device includes: the overall output luminous flux is 10,000 lm; the color temperature of the whole lamp output is 2500K; the connecting mechanism has a lamp post with a length of h3 = 40 cm.

[0117] In the specific implementation process, the lighting device can be installed in the central area of the ceiling surface in a typical indoor space with dimensions of 3m×3m×3m (length, width, and height), a ceiling reflectivity of 70%, a wall reflectivity of 50%, and a floor reflectivity of 20%. The lighting device controls the ceiling to form a circular illuminance gradient change from bright to dark from the central position to the edge position, which conforms to the proportional decrease shown in Table 2. The light spot G formed on the wall is cut off by a very large part at the junction of the ceiling and the wall, and the light spot G changes from the original closed-loop equal illuminance line to an open-loop and point-tending equal illuminance line.

[0118] The equal illuminance line distribution characteristics of the wall light spot are obtained as Figure 8 shown. From Figure 8 it can be seen that the equal illuminance lines are distributed in an orderly single-direction decreasing trend from the top of the wall to the bottom of the wall. The equal illuminance line distribution of the ceiling surface is as Figure 9 shown, Figure 9 and the light-emitting part has been shown.

[0119] The above embodiments can make the light distribution characteristics of the light emitted by the lighting device in the indoor space closer to those in the natural environment, so that the lighting environment in the indoor space is closer to the natural light environment, making the space distribution softer, achieving a warm, comfortable and more natural visual feeling in the indoor space, conforming to the concept of human-centered lighting, and further developing human-centered lighting.

[0120] In addition, the following are some exemplary comparative examples of this application:

[0121] Comparative Example 1

[0122] On the central area of the ceiling surface in a typical indoor space with dimensions of 3m×3m×3m (length×width×height), a ceiling lamp with a standard light distribution curve is installed, the suspension height is 60cm, and the output luminous flux is adjusted to 10,000lm for irradiation.

[0123] The isophote distribution characteristics of the wall are obtained as Figure 10 shown. From Figure 10 it can be seen that the wall isophotes are arranged messily, without the corner spot characteristics, and the maximum illuminance of the wall is 350 lux. The illuminance distribution of the ceiling surface is as Figure 11 shown, and the central illuminance of the ceiling surface is 4078 lux.

[0124] Comparative Example 2

[0125] On the central area of the ceiling surface in a typical indoor space with dimensions of 3m×3m×3m (length×width×height), a ceiling lamp with a standard light distribution curve is installed, the suspension height is 40cm, and the output luminous flux is adjusted to 10,000lm for irradiation.

[0126] The isophote distribution characteristics of the wall are obtained as Figure 12 shown. From Figure 12 it can be seen that the wall isophotes are arranged messily, without the corner spot characteristics, and the maximum illuminance of the wall is 600 lux. The illuminance distribution of the ceiling surface is as Figure 13 shown, and the central illuminance of the ceiling surface is 2482 lux.

[0127] In the description of this specification, the description of reference terms such as "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic description of the above terms does not necessarily refer to the same embodiment or example.

[0128] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0129] The above-described embodiments merely represent several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A method for controlling a lighting device, characterized in that: The light-emitting part of the lighting device is used to illuminate the ceiling of the indoor space to achieve indirect lighting. The light distribution lens of the light-emitting part is provided with a first free-form surface and a second free-form surface which are centrally symmetrical with respect to the optical axis. The first free-form surface is used to make the light emitted by the light source of the light-emitting part incident into the light distribution lens. The second free-form surface is used to make the angle formed by the emitted light of the light distribution lens and the horizontal plane not less than 5°. The first free-form surface and the second free-form surface are convex toward the direction of the ceiling as a whole, and the parts of the first free-form surface and the second free-form surface close to the ceiling are both flat surfaces parallel to the ceiling. The method comprises: The light emitted by the light source is configured to meet a preset light distribution curve through the light distribution lens, and the preset light distribution curve is used to make the illumination formed on the ceiling change from light to dark in an annular gradient from the center of the ceiling to the edge of the ceiling; When the light-emitting portion maintains a first distance from the ceiling, the preset light distribution curve forms a pre-configured first light spot on the wall of the indoor space, the first light spot is tangent to the junction between the ceiling and the wall, and the first light spot is used to form a closed-loop iso-illuminance line on the wall; When a second distance is maintained between the light emitting portion and the ceiling, the preset light distribution curve forms a pre-configured second light spot on the wall of the indoor space: wherein the second distance is smaller than the first distance, the second light spot is at least partially cut off by the boundary between the ceiling and the wall, and the second light spot is used to form an iso-illuminance line on the wall that is not a closed loop; When a third distance is maintained between the light-emitting portion and the ceiling, the preset light distribution curve forms a preconfigured third light spot on the wall of the indoor space: wherein the third distance is smaller than the second distance, a portion of the third light spot cut off by the junction between the ceiling and the wall is larger than a portion of the second light spot cut off by the junction between the ceiling and the wall, and the third light spot is used to form an iso-illuminance line on the wall that is not a closed loop and tends to a point.

2. The method according to claim 1, characterized in that The method further comprises: Controlling the light-emitting portion to maintain a first distance from the ceiling, so as to form a pre-configured first light spot on the wall of the indoor space through the preset light distribution curve; The first light spot is tangent to the boundary between the ceiling and the wall, and the first light spot is used to make the wall form a closed-loop iso-illuminance line.

3. The method according to claim 2, characterized in that The illumination of the first light spot is not less than 50% of the illumination of the center of the ceiling.

4. The method according to claim 2, characterized in that: The method further comprises: Controlling the light-emitting portion to maintain a second distance from the ceiling, so as to form a preconfigured second light spot on the wall of the indoor space through the preset light distribution curve: The second distance is smaller than the first distance, the second light spot is at least partially cut off by the boundary between the ceiling and the wall, and the second light spot is used to form a non-closed-loop iso-illuminance line on the wall.

5. The method according to claim 4, characterized in that The method further comprises: Controlling the light-emitting portion to maintain a third distance from the ceiling, so as to form a preconfigured third light spot on the wall of the indoor space through the preset light distribution curve: Among them, the third distance is smaller than the second distance, the portion of the third light spot cut off by the junction between the ceiling and the wall is larger than the portion of the second light spot cut off by the junction between the ceiling and the wall, and the third light spot is used to make the wall form an iso-illuminance line that is not a closed loop and tends to a point.

6. The method according to claim 1, characterized in that The method further comprises: The distance between the light emitting portion and the ceiling is controlled to be within a preset distance range, so that the preset light distribution curve and the distribution of equal illumination lines formed on the wall of the indoor space have a trend of orderly decreasing in one direction from the top of the wall to the bottom of the wall.

7. The method according to claim 6, characterized in that The method further comprises: The distance between the light emitting portion and the ceiling is controlled not to be within the preset distance range, so that the preset light distribution curve and the distribution of equal illumination lines formed on the wall of the indoor space have a decreasing trend in both directions toward the top and the bottom of the wall respectively.

8. The method according to any one of claims 1 to 7, characterized in that: The method further comprises: Through the preset light distribution curve, the illumination formed on the ceiling changes from light to dark in an annular gradient from the center of the ceiling to the edge of the ceiling, and the brightness at the edge of the ceiling is 10% of the brightness at the center of the ceiling.

9. A lighting device, characterized in that: The lighting device is used to implement the lighting device control method according to any one of claims 1 to 8.

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