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

Abstract

The invention relates to a control method of a lighting device, a light distribution lens and the lighting device. A light distribution lens of a light emitting part of the lighting device is provided with a first free-form surface and a second free-form surface which are centrosymmetric relative to an optical axis, and the first free-form surface is used for enabling light emitted by a light source of the light emitting part to enter the light distribution lens. The method comprises the steps that light rays emitted by the light source are configured to meet a preset light distribution curve through the light distribution lens, illumination formed on the ceiling is adjusted according to the preset light distribution curve, and the illumination intensity of the ceiling is adjusted according to the illumination intensity of the ceiling. An annular gradient change from bright to dark is formed from the center of the ceiling to the edge of the ceiling. By means of the method, the indoor environment is closer to the natural light environment, and spatial distribution is 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 widespread application of human-centered lighting, the concept of designing lighting methods centered on human needs and experience has led to the emergence of lamps with different lighting concepts. It aims to create a lighting environment that meets the physiological and psychological needs of the human body and optimize the lighting environment based on scientific basis to meet people's needs in work, life and study. Human-centered lighting meets people's visual, physiological and psychological needs in different scenarios by adjusting the color temperature, spectrum, illumination, light distribution, etc.

[0003] 80% of the information people obtain through vision comes from vision caused by light. The establishment of indoor light environment involves the distribution of light, which can affect people's visual experience and psychological feelings. The distribution and state of sunlight are different in different time periods, but it always has a positive impact on people's physical and mental health. Therefore, further research on sunlight is conducive to the establishment of indoor light environment, which is closer to the natural environment.

[0004] However, the inventors have found that the distribution of light emitted by lighting devices in traditional technology in indoor space is often not natural enough, which is not conducive to the lighting devices in traditional technology complying with the concept of human-oriented lighting. Summary of the invention

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

[0006] In a first aspect, the present application provides a control method for a lighting device, wherein a light-emitting portion of the lighting device is used to illuminate a ceiling of an indoor space to achieve indirect lighting, a light distribution lens of the light-emitting portion is provided with a first free-form surface and a second free-form surface which are centrally symmetric with respect to an optical axis, the first free-form surface is used to allow light emitted from a light source of the light-emitting portion to be incident on the inside of the light distribution lens, and the second free-form surface is used to allow an angle formed between an outgoing light of the light distribution lens and a horizontal plane to be at least not less than a preset angle, the first free-form surface and the second free-form surface are convex as a whole toward the direction of the ceiling, and a portion of the second free-form surface close to the ceiling is a flat surface parallel to the ceiling, and the method comprises:

[0007] The light emitted by the light source is configured to meet a preset light distribution curve through the light distribution lens. 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.

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

[0009] Through the preset light distribution curve, a plurality of annular iso-illuminance lines with the center of the ceiling as the center are formed on the ceiling, and the distance between the annular iso-illuminance lines and the center of the ceiling is inversely proportional to the illumination ratio corresponding to the annular iso-illuminance lines.

[0010] In one of the embodiments, when the shape of the ceiling is square, among the plurality of annular iso-illuminance lines, the annular iso-illuminance line farthest from the center of the ceiling is inscribed in the edge of the ceiling.

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

[0012] 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;

[0013] 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.

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

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

[0016] 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:

[0017] 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.

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

[0019] 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:

[0020] 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.

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

[0022] 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.

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

[0024] 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.

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

[0026] 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.

[0027] In one of the embodiments, 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 comprises:

[0029] By controlling the color temperature change of the light emitting portion, the color temperature of the light spot formed on the wall of the indoor space is made to be between 2500K and 3000K.

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

[0031] The first free-form surface is used to allow the light emitted by the light source to be incident on the interior of 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 at least not less than a preset angle;

[0033] The first free-curved surface and the second free-curved surface are convex toward the irradiation surface as a whole, and a portion of the second free-curved surface close to the irradiation surface is a straight surface parallel to the irradiation surface.

[0034] In a third aspect, the present application provides a lighting device, comprising: a method for controlling the lighting device as described in the first aspect or any possible implementation of the first aspect.

[0035] The control method, light distribution lens and lighting device of the lighting device are as follows: the light-emitting portion of the lighting device is used to illuminate the ceiling of the indoor space to realize indirect lighting; the light distribution lens of the light-emitting portion is provided with a first free-curved surface and a second free-curved surface which are centrally symmetrical with respect to the optical axis; the first free-curved surface is used to allow the light emitted by the light source of the light-emitting portion to be incident on the inside of the light distribution lens; the second free-curved surface is used to allow the angle formed by the emitted light of the light distribution lens and the horizontal plane to be at least not less than a preset angle; the first free-curved surface and the second free-curved surface are convex toward the ceiling as a whole; and the portion of the second free-curved surface close to the ceiling is a straight surface parallel to the ceiling. The method comprises: configuring the light emitted by the light source to meet a preset light distribution curve through a light distribution lens, and making the illumination formed on the ceiling change from the center of the ceiling to the edge of the ceiling in a circular gradient from bright to dark through the preset light distribution curve, so that the light distribution characteristics of the light emitted by the lighting device in the indoor space are closer to the light distribution characteristics in the natural environment, thereby making the lighting environment in the indoor space closer to the natural light environment, making the spatial distribution softer, and creating a warm, comfortable and more natural visual experience in the indoor space, which is in line with the concept of human-centered lighting and further develops human-centered lighting. BRIEF 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 drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 is a schematic flow chart of a method for controlling a lighting device in an embodiment;

[0038] Figure 2 is a cross-sectional schematic diagram of a light distribution lens in one embodiment;

[0039] Figure 3 A schematic diagram of a light distribution curve formed by a light source through a light distribution lens in one embodiment;

[0040] Figure 4It is the iso-illuminance line distribution diagram of the wall light spot in Example 1 of the present application;

[0041] Figure 5 It is the iso-illuminance line distribution diagram of the ceiling in Example 1 of the present application;

[0042] Figure 6 It is the iso-illuminance line distribution diagram of the wall light spot in Example 2 of the present application;

[0043] Figure 7 It is the iso-illuminance line distribution diagram of the ceiling in Example 2 of the present application;

[0044] Figure 8 It is the iso-illuminance line distribution diagram of the wall light spot in Example 3 of the present application;

[0045] Fig. 9 It is the iso-illuminance line distribution diagram of the ceiling in Example 3 of the present application;

[0046] Fig.10 This is the iso-illuminance line distribution diagram of the wall in Comparative Example 1 of the present application;

[0047] Fig.11 This is the iso-illuminance line distribution diagram of the ceiling in Comparative Example 1 of the present application;

[0048] Fig.12 This is the iso-illuminance line distribution diagram of the wall in Comparative Example 2 of the present application;

[0049] Fig.13 This is the iso-illuminance line distribution diagram of the ceiling in Comparative Example 2 of the present application;

[0050] Fig.14 It is a trend diagram of the illumination distribution of the wall corresponding to the case where the length of the link mechanism of the lighting device in one embodiment is 60-20 cm;

[0051] Fig.15 A trend diagram of the illumination distribution of a wall corresponding to a connection mechanism of a lighting device in an embodiment when the length is greater than 60 cm;

[0052] Fig.16 It is a trend diagram of the corresponding wall illumination distribution when the length of the link mechanism of the lighting device in an embodiment is less than 20 cm. DETAILED DESCRIPTION

[0053] In order to facilitate understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. Embodiments of the present application are provided 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 those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

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

[0056] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that, in addition to the orientations shown in the figures, spatially relative terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, an element or feature described as "under other elements" or "under it" or "under it" will be oriented as being "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include additional orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

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

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

[0059] As described in the background technology, 80% of the information people obtain through vision comes from vision caused by light. The establishment of indoor light environment involves the distribution of light, which can affect people's visual experience and psychological feelings. Among them, the distribution and state of sunlight are different in different time periods, but it always has a positive impact on people's physical and mental health. Therefore, further research on sunlight is conducive to the establishment of indoor light environment, which is closer to the natural environment.

[0060] Based on the above reasons, the inventors started from studying the state and distribution of sunlight in the natural environment, and configured the state characteristics and light distribution characteristics of the light emitted by the lighting device in the indoor space to meet the preset conditions, so that the indoor space characteristics are close to the natural environment characteristics, such as Figure 1 As shown, the present application provides a method for controlling a lighting device; the light-emitting part of the lighting device is used to illuminate the ceiling of an indoor space to achieve indirect lighting.

[0061] Among them, Figure 2 As shown, the light distribution lens 210 of the light emitting unit 200 is provided with a first free-form surface 211 and a second free-form surface 212 which are centrally symmetrical with respect to the optical axis. The first free-form surface 211 is used to allow the light emitted by the light source 220 of the light emitting unit to be incident on the light distribution lens 210, and the second free-form surface 212 is used to make the angle formed by the emitted light of the light distribution lens 210 and the horizontal plane be at least not less than a preset angle. The first free-form surface 211 and the second free-form surface 212 are convex toward the ceiling as a whole, and the portion 213 of the second free-form surface 212 close to the ceiling is a flat surface parallel to the ceiling.

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

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

[0064] Specifically, the light emitted from the light source 220 can be refracted and deflected by the specific arc shape of the first free-curved surface 211 and the second free-curved surface 212, thereby determining the direction of the light emitted from the light distribution lens 210. Figure 2 As shown, the incident light is refracted by the first free-form surface 211 to the second free-form surface 212, and the second free-form surface 212 performs secondary refraction and deflection, so that the final exiting light has an angle of 5° with the horizontal. Among them, the first free-form surface 211 and the second free-form surface 212 near the ceiling can be set to a top straight shape, so that the light is supplemented upward after secondary refraction. The light source 220 can be formed as shown in the following through the single light distribution lens or multiple light distribution lenses arranged in a certain order. Figure 3 The light distribution curve shown is the preset light distribution curve below. The state characteristics and light distribution characteristics of the light emitted by the lighting device in the indoor space are configured to meet preset conditions, so that the indoor space characteristics are close to the natural environment characteristics.

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

[0066] Step S100, the light emitted by the light source is configured to meet a preset light distribution curve through a light distribution lens, and the illuminance formed on the ceiling changes from the center of the ceiling to the edge of the ceiling in a circular gradient from bright to dark through the preset light distribution curve. 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-mentioned lighting device also includes: forming a plurality of annular iso-illuminance lines on the ceiling with the center of the ceiling as the center of the circle through a preset light distribution curve, and the size of the annular iso-illuminance lines from the center of the ceiling is inversely proportional to the illumination ratio corresponding to the annular iso-illuminance lines.

[0068] When the shape of the ceiling is a square, among the multiple annular iso-illuminance lines, the annular iso-illuminance line farthest from the center of the ceiling is inscribed in the edge of the ceiling.

[0069] To facilitate the understanding of those skilled in the art, assuming that the size of the indoor space is 3m×3m×3m (length, width and height), the ceiling surface can be divided into equal illumination lines from l1 to l 10 , where the distance between two adjacent annular isoluminance lines can be 0.15m; i.e., l1 to l 10 Each iso-illuminance line is 0.15m, 0.3m, 0.45m, and 1.5m away from the center point O of the ceiling. Among the multiple annular iso-illuminance lines, the annular iso-illuminance line farthest from the center of the ceiling (i.e., l 10 The iso-illuminance line) is inscribed in the edge of the square ceiling. In practical applications, the lighting device is suspended in the center of the ceiling through a link mechanism. When the length of the link mechanism of the lighting device is 60 cm, the annular illumination gradient ratio of the ceiling is shown in Table 1 below.

[0070] Table 1

[0071]

[0072] It can be seen that the distance between the annular iso-illuminance line and the center of the ceiling is inversely proportional to the illumination ratio corresponding to the annular iso-illuminance line, that is, the larger the distance between the annular iso-illuminance line and the center of the ceiling, the smaller the illumination ratio corresponding to the annular iso-illuminance line. 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, wherein the light-emitting portion of the lighting device is used to illuminate the ceiling of an indoor space to achieve indirect lighting, and the light distribution lens of the light-emitting portion is provided with a first free-curved surface and a second free-curved surface which are centrally symmetrical with respect to the optical axis, the first free-curved surface is used to allow the light emitted by the light source of the light-emitting portion to be incident on the inside of the light distribution lens, and the second free-curved surface is used to allow the angle formed by the emitted light of the light distribution lens and the horizontal plane to be at least not less than a preset angle, the first free-curved surface and the second free-curved surface are convex toward the ceiling as a whole, and the portion of the second free-curved surface close to the ceiling is a plane parallel to the ceiling. Directly, the method includes: configuring the light emitted by the light source to meet a preset light distribution curve through a light distribution lens, and through the preset light distribution curve, making the illumination formed on the ceiling change from the center of the ceiling to the edge of the ceiling in a circular gradient from bright to dark, so that the light distribution characteristics of the light emitted by the lighting device in the indoor space are closer to the light distribution characteristics in the natural environment, thereby making the lighting environment in the indoor space closer to the natural light environment, making the spatial distribution softer, and creating a warm, comfortable and more natural visual experience in the indoor space, which is in line with the concept of human-centered lighting and further develops human-centered lighting.

[0074] In an exemplary embodiment, the method also includes: controlling the light-emitting portion to maintain a first distance from the ceiling to form a preconfigured 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 illumination line on the wall.

[0075] In a specific implementation, the lighting device is suspended at the center of the ceiling through a linking mechanism, and the linking mechanism can be set as a mechanism with adjustable length; in this way, 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, a first distance is maintained between the light-emitting part and the ceiling. When the first distance is maintained between the light-emitting part and the ceiling, the lighting device can form a preconfigured 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 illumination of the first light spot is not less than 50% of the illumination at the center of the ceiling. To facilitate understanding by those skilled in the art, please refer to Figure 4 , Figure 4 This is a reference diagram for the shape of the first light spot.

[0076] from Figure 4It can be seen that the lighting device of this embodiment controls the length of the link mechanism to maintain a first distance between the light-emitting portion and the ceiling, thereby forming 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 forms a closed-loop iso-illuminance line on the wall. The first light spot is the key to the lighting device 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, so that the eyes of people in the indoor space are in a relaxed state, which is in line with the concept of human-factor lighting.

[0077] In an exemplary embodiment, the method also includes: controlling the light-emitting portion to maintain a second distance from the ceiling to form a preconfigured second light spot on the wall of the indoor space through a preset light distribution curve: wherein the second distance is smaller than the first distance, and the second light spot is at least partially cut off by the junction 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.

[0078] In a specific implementation, by controlling the length of the lighting device link mechanism to be h2 (h2 Figure 6 , Figure 6 This is a reference diagram for the shape of the second light spot.

[0079] In an exemplary embodiment, the method also includes: controlling the light-emitting portion to maintain a third distance from the ceiling to form a preconfigured third light spot on the wall of the indoor space through a preset light distribution curve: 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 equal illumination line on the wall that is not a closed loop and tends to a point.

[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, most 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 as the shape reference diagram 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 isophote line formed on the wall of the indoor space by the preset light distribution curve has a trend of decreasing 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 Fig.14 shown, from Fig.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 isophote line formed on the wall of the indoor space by the preset light distribution curve has a trend of decreasing in two directions 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 Fig.15 shown, from Fig.15 it can be seen that the isophote line decreases in two directions 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 Fig.16 shown, from Fig.16 it can be seen that the isophote line decreases in two directions 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 size of the indoor space is 3m×3m×3m (length, width and height), the light source is irradiated to 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] Wherein, 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, and the value of n is set to any value greater than 1 and less than 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 of the ceiling to the edge of the ceiling decreases gradually as shown in Table 1; because the light source and the receiving surface are both centrally symmetrical relative to the polar axis, a circular gradient change from bright to dark is formed from the center of the ceiling to the edge.

[0090] When the beam angle is 0°, the irradiation position is the center of the ceiling, making the center of the ceiling the brightest point on the ceiling. When the beam angle is 78°, the light intensity reaches the maximum peak, which is about 25 times that of the beam angle of 0°. According to the light intensity formula:

[0091]

[0092] Wherein, 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, and the value of n is set to any value greater than 1 and less than 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 of the ceiling to the brightness at the center of the ceiling is 0.5.

[0094] When the beam angle is 78°, the irradiation position is the junction of the ceiling edge and the wall, so that a light spot is produced at the corner of the wall. When the beam angle is in the range of 78°-90°, the irradiation position is the wall, and the light intensity is reduced at a certain ratio, so that the wall produces equal illumination lines that decrease in a single direction from top to bottom.

[0095] In an exemplary embodiment, the method further includes: controlling the color temperature change of the light emitting portion so that the color temperature of the light spot formed on the wall of the indoor space is between 2500K and 3000K.

[0096] In a specific implementation, the color temperature of the light source in the light-emitting part can be controlled to change so that the color temperature of the light spot formed on the wall of the indoor space is 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 change of the local sunrise to sunset time, so as to simulate the color temperature scene of the sun's sunrise and sunset.

[0097] The technical solution of this embodiment controls the color temperature of the light spot formed by the lighting equipment on the wall to be between 2500K and 3000K, so that the lighting equipment can simulate the color temperature scenes of sunrise and sunset, making the lighting environment in the indoor space closer to the natural light environment, thereby creating a warm, comfortable and more natural visual experience in the indoor space.

[0098] A light distribution lens is provided with a first free-curved surface and a second free-curved surface which are centrally symmetrical with respect to an optical axis; the first free-curved surface is used to allow light emitted by a light source to be incident on the inside of the light distribution lens; the second free-curved surface is used to allow the angle formed by the emitted light of the light distribution lens and the horizontal plane to be at least not less than a preset angle; the first free-curved surface and the second free-curved surface are convex as a whole toward the direction of an irradiation surface, and the portion of the second free-curved surface close to the irradiation surface is a flat surface parallel to the irradiation surface.

[0099] It should be noted that the definition of the above-mentioned light distribution lens can be found above and will not be repeated here.

[0100] The light distribution lens of this embodiment 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 allow the light emitted by the light source to be incident on the inside of 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 be at least not less than a preset angle; the first free-form surface and the second free-form surface are convex as a whole toward the direction of the illumination surface, and the portion of the second free-form surface close to the illumination surface is a flat surface parallel to the illumination surface; the light emitted by the light source is configured through the light distribution lens to meet a preset light distribution curve, and 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.

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

[0102] It should be noted that further limitations of the above-mentioned lighting device can be found above and will not be elaborated here.

[0103] The lighting device of this embodiment, 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-curved surface and a second free-curved surface which are centrally symmetrical with respect to the optical axis, the first free-curved 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-curved surface is used to make the angle formed by the emitted light of the light distribution lens and the horizontal plane at least not less than a preset angle, the first free-curved surface and the second free-curved surface are convex toward the ceiling as a whole, and the part of the second free-curved surface close to the ceiling is a flat surface parallel to the ceiling, the method comprises: configuring the light emitted by the light source to meet a preset light distribution curve through the light distribution lens, through the preset light distribution curve, the illumination formed on the ceiling changes from bright to dark in an annular gradient from the center of the ceiling to the edge of the ceiling, so that the light distribution characteristics of the light emitted by the lighting device in the indoor space are 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, the spatial distribution is softer, and a warm, comfortable and more natural visual sense is created in the indoor space, which conforms to the concept of human-centered lighting and further develops human-centered lighting.

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

[0105] Example 1

[0106] An indoor lighting device comprises: an overall output luminous flux of 10000 lm; an output color temperature of the entire lamp of 3000K; and a lamp pole with a connecting mechanism h1=60 cm in length.

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

[0108] The iso-illuminance line distribution characteristics of the wall light spot are obtained as follows: Figure 4 As shown, from Figure 4 It can be seen that the iso-illuminance lines 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 spot G is 1150 lux. Figure 5 As shown, Figure 5 The light-emitting part is shown. According to the illumination distribution diagram of the ceiling, the annular illumination gradient ratio of the ceiling is shown in Table 2. The illumination at the center of the ceiling is 1330 lux.

[0109] Table 2

[0110]

[0111] Example 2

[0112] An indoor lighting device comprises: an overall output luminous flux of 10000 lm; an output color temperature of the entire lamp of 2500K; and a lamp pole with a connecting mechanism h2=59 cm in length.

[0113] In the specific implementation process, the lighting device can be installed in the central area of ​​the ceiling in a typical indoor space with a size of 3m×3m×3m (length, width and height), a ceiling reflectivity of 70%, a wall reflectivity of 50%, and a ground reflectivity of 20%. The lighting device controls the ceiling to form a ring-shaped illumination gradient change from bright to dark from the central position to the edge position. The top of the light spot G formed by 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 iso-illuminance line to an open-loop iso-illuminance line.

[0114] The iso-illuminance line distribution characteristics of the wall light spot are obtained as follows: Figure 6 As shown, from Figure 6 It can be seen that the iso-illuminance lines are distributed in an orderly and unidirectional decreasing trend from the top of the wall to the bottom of the wall. Figure 7 As shown, Figure 7 The light emitting portion is shown.

[0115] Example 3

[0116] An indoor lighting device comprises: an overall output luminous flux of 10000 lm; an output color temperature of the entire lamp of 2500K; and a lamp pole with a connecting mechanism h3=40 cm in length.

[0117] In the specific implementation process, the lighting device can be installed in the central area of ​​the ceiling in a typical indoor space with a size of 3m×3m×3m (length, width and height), a ceiling reflectivity of 70%, a wall reflectivity of 50%, and a ground reflectivity of 20%. The lighting device controls the ceiling to form a ring-shaped illumination gradient change from bright to dark from the central position to the edge position in accordance with the proportional decrease shown in Table 2. The light spot G formed by the wall is cut off by the junction of the ceiling and the wall, and the light spot G changes from the original closed-loop iso-illuminance line to an iso-illuminance line that is not closed and tends to a point.

[0118] The iso-illuminance line distribution characteristics of the wall light spot are obtained as follows: Figure 8 As shown, from Figure 8 It can be seen that the iso-illuminance lines are distributed in an orderly and unidirectional decreasing trend from the top of the wall to the bottom of the wall. Fig. 9 As shown, Fig. 9 The light emitting portion is shown.

[0119] The above-mentioned embodiments 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, thereby making the lighting environment in the indoor space closer to the natural light environment, making the spatial distribution softer, and creating a warm, comfortable and more natural visual experience in the indoor space, which is in line with the concept of human-centered lighting and enables further development of human-centered lighting.

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

[0121] Comparative Example 1

[0122] In the central area of ​​the ceiling of 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 ground reflectivity of 20%, a ceiling lamp with a standard light distribution curve is installed with a hanging height of 60cm and the output luminous flux is adjusted to 10,000lm for illumination.

[0123] The distribution characteristics of the iso-illuminance lines of the wall are obtained as follows Fig.10 As shown, from Fig.10 It can be seen that the illuminance lines on the wall are arranged in a disorderly manner, there is no corner spot feature, and the maximum illuminance on the wall is 350 lux. Fig.11 As shown, the illuminance at the center of the ceiling is 4078 lux.

[0124] Comparative Example 2

[0125] In the central area of ​​the ceiling of 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 ground reflectivity of 20%, a ceiling lamp with a standard light distribution curve is installed with a hanging height of 40cm and the output luminous flux is adjusted to 10,000lm for illumination.

[0126] The distribution characteristics of the iso-illuminance lines of the wall are obtained as follows Fig.12 As shown, from Fig.12 It can be seen that the illuminance lines on the wall are arranged in a disorderly manner, there is no corner spot feature, and the maximum illuminance on the wall is 600 lux. Fig.13 As shown, the illuminance at the center of the ceiling is 2482 lux.

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

[0128] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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, they should be considered to be within the scope of this specification.

[0129] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, 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 attached 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 be at least not less than a preset angle. The first free-form surface and the second free-form surface are convex toward the ceiling as a whole, and the part of the second free-form surface close to the ceiling is a flat surface 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. 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.

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. The method according to any one of claims 1 to 7, characterized in that: The angle formed by the outgoing light of the light distribution lens and the horizontal plane is at least not less than 5°.

10. 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 9.

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