Water droplet show system and water droplet show method

Abstract

The present invention aims to improve the degree of freedom of performance using the afterimage effect of water droplets. The solution of the present invention is to intermittently generate water droplets W by a water droplet generating device 10, and to irradiate the water droplets W with light at a predetermined cycle along the moving path of the water droplets W by an illuminating device 20. As the illuminating device 20, in the case of dividing one cycle of irradiating the water droplets W with light into a plurality of intervals in time, a device capable of controlling the light emission state in each interval is adopted. Thereby, for example, one water droplet can emit light of multiple colors, and the size or the moving freedom of the afterimage of the water droplets visually recognized by the audience can be changed freely.

Description

Technical Field

[0001] This invention relates to a water droplet performance system and method. Specifically, this invention relates to a system and method for irradiating intermittently generated and freely falling water droplets with light at a predetermined period, and creating the illusion that the water droplets are floating in the air by having the audience visually confirm the afterimage of the water droplets. Background Technology

[0002] In the past, methods for creating water droplet effects have been proposed, which utilize the afterimage effect produced by irradiating water droplets falling at fixed time intervals with light at a predetermined period. For example, Patent Document 1 discloses a viewing / observation method in which multiple flashes of two or more colors are alternately irradiated onto numerous artificial water droplets that flow continuously at fixed time intervals, so that the water droplets alternately emit light of two or more colors.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Publication No. 7-46522 Summary of the Invention

[0006] The problem that the invention aims to solve

[0007] However, in Patent Document 1, although multiple frequency flashes are used to make multiple water droplets emit light in two or more colors, if a particular water droplet is focused on, that droplet is only illuminated in a single color. Therefore, the method described in Patent Document 1 cannot make a single water droplet emit multicolored light.

[0008] Furthermore, in the method described in Patent Document 1, all water droplets are perceived by the viewer as afterimages of the same size (specifically, the length in the direction of fall). Therefore, the size of the afterimages of the water droplets perceived by the viewer cannot be changed in the method described in Patent Document 1.

[0009] Thus, conventional methods could only alter the performance by changing the degree of color of the water droplets, which could lead to audience boredom when the performance was repeated or viewed for extended periods. Therefore, the main objective of this invention is to further enhance the freedom of performances utilizing the afterimage of water droplets.

[0010] Technical solutions to the problem

[0011] The inventors of this invention, after careful consideration of solutions to the problems of the prior art, concluded that the period of light irradiation on the water droplet is further divided into time segments, and the light emission state of the illumination device is controlled in each time segment. This leads to insights such as: enabling a single water droplet to emit multi-colored light, changing the size or movement of the afterimage of the water droplet as perceived by the viewer, etc. Based on these insights, the inventors of this invention conceived of a method to solve the problems of the prior art, and thus completed this invention. Specifically, this invention has the following structure or steps.

[0012] The first aspect of the present invention relates to a water droplet performance system. The water droplet performance system of the present invention includes: a water droplet generating device that intermittently generates water droplets; and an illumination device that illuminates the water droplets with light at a predetermined period. Furthermore, while the period of illumination of the water droplets by the illumination device is not required to be exactly the same as the period of water droplet generation by the water droplet generating device, it is preferable that the illumination period corresponds to the water droplet generation period. For example, it is preferable that the illumination period [Hz] is 80-120% of the water droplet generation period [Hz]. Further, as this illumination device, when one period is divided into multiple intervals in time, a device is used that allows control of the light emission state in each interval. Furthermore, controlling the light emission state in each interval includes, for example, setting the emission color (hue and / or tone), brightness (luminous intensity) in each interval, or controlling the on or off of the light emission in each interval. Furthermore, the illumination device is not limited to illuminating the water droplets with multicolored light; it can also be a device that illuminates the water droplets with monochromatic light. In particular, the illumination device is configured to illuminate the water droplets along their movement path. Specifically, when a water droplet falls freely from top to bottom, the lighting device illuminates the droplet parallel (i.e., perpendicular) to its path of fall, and illuminates the droplet from directly above or below.

[0013] As described above, dividing the light irradiation cycle into time segments can be viewed as dividing the space in which the water droplet moves within one cycle of this irradiation cycle. Therefore, the space in which the water droplet moves within one cycle of the irradiation cycle can be considered a display, and the segmented space can be considered the smallest unit of the image, i.e., a pixel, allowing for free coloring of the water droplet. Furthermore, the water droplet illuminated by light leaves a residual image in the viewer's vision as an afterimage. Therefore, according to the present invention, highly free animation can be achieved using the afterimage of the water droplet. For example, a water droplet can emit multicolored light, the size of the afterimage of a water droplet can be shortened or lengthened, or the afterimage of a water droplet can be made to rise or fall slowly, thus expanding the expressive range of performances utilizing the afterimage of the water droplet. Furthermore, by configuring the lighting device to illuminate the water droplet along its path of movement, a performance space where illuminated water droplets cascade down can be created, and people can also enter this performance space.

[0014] In the water droplet performance system of the present invention, as described above, the lighting device preferably allows control over the emitted color at least in each interval after dividing the light irradiation period. Furthermore, the period of light irradiation on the water droplets by the lighting device is preferably substantially consistent with the period of water droplet generation by the water droplet generating device. While the light irradiation period is ideally 100% consistent with the water droplet generation period, an error of ±5% is permissible.

[0015] In the water droplet performance system of the present invention, the lighting device may also include multiple light-emitting elements. Specifically, it is preferable to simultaneously illuminate multiple water droplets emitted from the water droplet generating device and existing in the air at the same time through multiple light-emitting elements. Furthermore, the multiple water droplets existing in the air at the same time may be emitted from the same nozzle of the water droplet generating device or from different nozzles. In this way, by illuminating the water droplets with multiple light-emitting elements, the way in which the water droplets emit light can be changed by each light-emitting element.

[0016] In the water droplet performance system of the present invention, the light-emitting element included in the water droplet generating device is preferably a narrow-angle light source (so-called a spotlight) with a half-angle light distribution angle of 20 degrees or less. Furthermore, the half-angle light distribution angle is the angle range in which the brightness (light intensity) of the light emitted from the light-emitting element is more than half of its maximum value. The half-angle light distribution angle is measured by keeping the distance from the light-emitting element fixed while moving the light receiver and measuring the light intensity at each angle. Thus, by using a light source with a narrow angle light distribution angle for each light-emitting element, the state of the light illuminating the water droplet can be precisely controlled, allowing the audience to perceive the afterimage of the water droplet more clearly.

[0017] The second aspect of the present invention relates to a method for creating a water droplet effect. In this method, water droplets are generated intermittently and illuminated with light at predetermined intervals. The illumination period is divided into multiple time intervals, and the light emission state is adjusted in each interval. Furthermore, light is illuminated along the movement path of the water droplets.

[0018] Invention Effects

[0019] According to the present invention, the degree of freedom in performances utilizing the afterimage of water droplets can be increased. Attached Figure Description

[0020] [ Figure 1 ] Figure 1 This schematically illustrates the composition of a water droplet performance system.

[0021] [ Figure 2 ] Figure 2 This represents the basic concept of the water droplet rendering method;

[0022] [ Figure 3 ] Figure 3An example of a water droplet performance;

[0023] [ Figure 4 ] Figure 4 Another example of a water droplet performance;

[0024] [ Figure 5 ] Figure 5 Another example of a water droplet performance;

[0025] [ Figure 6 ] Figure 6 This schematically illustrates another implementation of the water droplet performance system;

[0026] [ Figure 7 ] Figure 7 This schematically illustrates yet another implementation of the water droplet performance system;

[0027] [ Figure 8 ] Figure 8 This is a reference example of a waterdrop performance system. Detailed Implementation

[0028] Hereinafter, with the aid of accompanying drawings, a method for carrying out the invention will be described. The invention is not limited to the methods described below, but also includes suitable modifications that will be apparent to those skilled in the art.

[0029] Figure 1 This illustrates an example of the configuration of the water droplet performance system 100 of the present invention. For example... Figure 1 As shown, the system 100 of the present invention includes: a water droplet generating device 10, an illumination device 20, and a control device 30. The water droplet generating device 10 intermittently generates water droplets W at a predetermined period. The illumination device 20 illuminates the water droplets W generated by the water droplet generating device 10 with light at a predetermined period. The control device 30 is connected to the water droplet generating device 10 and the illumination device 20, and controls the period and the amount of water generated by the water droplet generating device 10, and controls the period and the emission state of the light illuminating by the illumination device 20. Viewers can visually recognize the afterimage of the water droplets W illuminated by the illumination device 20.

[0030] Generally, if the formation period of the water droplet coincides with the illumination period of the light, it appears to the viewer that the afterimage of the water droplet W floats and remains suspended in the air. Furthermore, when the illumination period of the light is faster than the formation period of the water droplet, it appears to the viewer that the afterimage of the water droplet W rises slowly in the opposite direction to the actual falling direction of the water droplet W. Conversely, when the illumination period of the light is slower than the formation period of the water droplet, it appears to the viewer that the afterimage of the water droplet W falls slowly in the same direction as the actual falling direction of the water droplet W. The system 100 of the present invention utilizes the interaction of water droplets and light based on this fundamental principle. Further, as detailed later, the present invention further divides the illumination period of the light into multiple segments and controls the emission state of the light in each segment. As a result, even when the illumination period of the light coincides with the formation period of the water droplet, the movement (rising or falling) of the afterimage of the water droplet W can still be displayed.

[0031] There are no particular limitations on the water droplet generating device 10; existing devices can be used. For example, Figure 1 As shown, the water droplet generating device 10 can continuously generate water droplets W at fixed intervals and allow them to fall simply. Alternatively, another type of water droplet generating device 10 can be used, which ejects water droplets W upwards and causes them to move in a parabolic trajectory (not shown). Furthermore, the water droplets W emitted from the water droplet generating device 10 generally form a spherical shape (i.e., a water droplet) as they fall through the air. However, the shape of the water droplets W is not limited to this; they can also be linear or spiral-shaped immediately after being emitted from the water droplet generating device 10. For example, the devices disclosed in Japanese Patent Application Publication No. Hei 09-141157, Japanese Patent Application Publication No. 2000-107647, and Japanese Patent Application Publication No. 2013-91019 can be used or applied as the water droplet generating device 10.

[0032] refer to Figure 1This describes an example of a water droplet generating device 10. The water droplet generating device 10 stores water in a water storage tank 11, which is drawn up by a pump 12. When the pump 12 is operated, water is supplied through a pipe 13 to a tank 14 located above the water storage tank 11, where it is temporarily stored. The tank 14 is connected to a nozzle 15, and a fixed amount of water in the tank 14 is discharged sequentially from the nozzle 15. Furthermore, the vibration generated by the vibrator 16 is transmitted to the nozzle 15 via a vibrating plate 17. Thus, when water is discharged from the nozzle 15, water droplets W (specifically, water beads) are intermittently ejected from the outlet of the nozzle 15 by applying vibration to the nozzle 15 with the vibrator 16 and the vibrating plate 17. The generation cycle of the water droplets W generated by the nozzle 15 depends on the vibration frequency of the vibrator 16. The vibration frequency of the vibrator 16 is preferably 30–100 Hz, and more preferably 55–75 Hz. Water droplets W ejected from nozzle 15 fall freely and are stored in water tank 11. Water in water tank 11 is then drawn up again by pump 12 and circulated within the droplet generating device 10. Pump 12 and vibrator 16 of the droplet generating device 10 can be controlled by control device 30. The amount of water supplied via pump 12 can be controlled to regulate the amount of water ejected from nozzle 15. Furthermore, the generation cycle of water droplets W generated via nozzle 15 can be controlled by adjusting the vibration frequency of vibrator 16. Additionally, an air vent valve 18 with a check valve structure is provided in tank 14 to expel air accumulated in tank 14. Thus, tank 14 becomes a closed system filled only with water.

[0033] The lighting device 20 illuminates the water droplets W generated by the water droplet generating device 10 and falling from the air with a stroboscopic light. The lighting device 20 is positioned near the outlet of the nozzle 15 of the water droplet generating device 10 and illuminates the water droplets W along their falling path (movement path). Specifically, when the water droplets W fall freely from above, the lighting device 20 illuminates the droplets W substantially parallel to their falling path. The lighting device 20 may include multiple light-emitting elements. Ideally, each light-emitting element should be a multi-color light-emitting element with multiple LEDs. For example, a full-color LED with at least three colors—red, blue, and green—can be used. Alternatively, a four-color light source can be used, consisting of LEDs of these three colors plus a white LED. Thus, the lighting device 20 is essentially configured to simultaneously illuminate multiple water droplets W falling from the air using a single lighting device 20.

[0034] Furthermore, each light-emitting element of the lighting device 20 is preferably a light source with a narrow beam angle, such as a spotlight. Specifically, the half beam angle of the light-emitting element is preferably 1 to 20 degrees, and more preferably 3 to 15 degrees or 5 to 10 degrees. In this way, by using multiple narrow-angle light-emitting light sources to illuminate the water droplet W, the color of the light illuminating each water droplet W can be adjusted with high precision. In addition, since the lighting device 20 illuminates the water droplet W with narrow-angle light-emitting light sources, it is preferable to set the movement path of the water droplet W and the arrangement position of the light-emitting elements to be close. For example, the distance between the movement path of the water droplet W and the position of the light-emitting elements is preferably less than 1 meter, for example, it can be about 1 cm to 80 cm, 3 cm to 70 cm, or 5 cm to 50 cm.

[0035] Furthermore, for each light-emitting element, a pulse width modulation (PWM) device can be used to control the light emission state (emission color, brightness, on / off, etc.) in a shorter time unit than the generation cycle of the water droplet W. For example, if the generation cycle of the water droplet W is 50Hz, the illumination cycle of the light emitted by each light-emitting element is also set to 50Hz in accordance with the generation cycle. If this 50Hz (i.e., 20ms) illumination cycle is divided into 50μs units, it can be divided into 400 intervals (pixels). Then, the light-emitting element can change the light emission state every 50μs interval (pixel). Specifically, the light-emitting element can adjust the brightness in 128 stages for a 50μs pulse. In addition, if the light-emitting element is a four-color light source of red, blue, green, and white, since the brightness can be adjusted for each color in 128 stages, approximately 270 million colors (128 to the power of 4) can be reproduced. Furthermore, the number of divisions (i.e., the number of intervals) of the light illumination cycle is not limited to the aforementioned 400, and can be set appropriately. For example, the lower limit of the number of light irradiation cycle segments can be set to 2, 3, 5, or 10, and the upper limit can be set to around 1000. Furthermore, the lighting device 20 controls the light emission state of each segment via the control device 30. The control device 30 can also control multiple light-emitting elements constituting the lighting device 20 in an integrated manner, or it can control the light emission state of each individual light-emitting element.

[0036] Thus, by dividing the space in which the water droplet W moves into hundreds of pixels within each cycle of the light irradiation period, this space can be simply considered as a display. Furthermore, if the generation cycle of the water droplet W is made consistent with the light irradiation cycle, when considering the movement of the afterimage of the water droplet W, it becomes unnecessary to adjust the relationship between the generation cycle of the water droplet W and the light irradiation cycle; instead, it is only necessary to adjust the illumination state of the intervals (pixels) after the light irradiation cycle is divided into time segments. Therefore, similar to a general display, based on the viewpoint of displaying animation by manipulating each interval (pixel), the movement and color of the afterimage of the water droplet W can be controlled. As a result, a high degree of freedom in performance can be achieved with simple settings.

[0037] The control device 30 controls the water droplet generating device 10 and the lighting device 20. The control device 30 can be a general-purpose computer or a dedicated controller. Furthermore, in... Figure 1 In the example shown, for ease of explanation, although the water droplet generating device 10 and the lighting device 20 are depicted as being controlled by a single control device 30, the water droplet generating device 10 and the lighting device 20 can also be controlled by separate control devices.

[0038] Next, refer to Figure 2 The basic concepts of the water droplet performance method executed by the aforementioned system 100 will be explained. Figure 2 This schematically illustrates the changes in the luminous state of the lighting device 20 (strobe pulse), the behavior of the water droplets, and the afterimage of the water droplets perceived by a human eye during one illumination cycle T. This illumination cycle T is the period from the start time 0 to the end time t, for example, approximately 10–100 ms (100–10 Hz). In particular, since the temporal resolution of the human eye is approximately 50–100 ms, it is preferable to set the illumination cycle T to be shorter than the human temporal resolution in order to achieve the afterimage effect. For example, it is preferable to set one illumination cycle T to 10–50 ms. Furthermore, in… Figure 2 In the example shown, the formation period i of the water droplets is substantially the same as the illumination period T of the light. Furthermore, the formation period i of the water droplets is proportional to the interval between one water droplet and the next.

[0039] Furthermore, an irradiation period T is divided into multiple intervals p1 to p2 over time. n .exist Figure 2 In the example shown, although one illumination period T is divided into 10 intervals for ease of explanation, this number of divisions can be arbitrarily increased or decreased. Then, when the illumination period T coincides with the droplet formation period i, by dividing one illumination period T into multiple intervals, the space in which the droplet moves within this illumination period T can be considered as being composed of the smallest unit of the image, i.e., multiple pixels. That is, by controlling the emitted color or brightness, and turning the emission on / off for each interval (pixel), the droplet W can be viewed as a display screen, freely adjusting the color and movement of the droplet's afterimage.

[0040] exist Figure 2In the example shown, within one illumination period T, the emitted light color gradually changes from dark to bright from interval p1 to interval p6, and the emission is turned off in subsequent intervals. Water droplets falling downwards during this illumination period T are illuminated with various colors of light from interval p1 to interval p6, but do not receive light in subsequent intervals. Therefore, the afterimages of the water droplets that received colored light from interval p1 to interval p6 within the illumination period T remain in the viewer's vision. Thus, as... Figure 2 As shown, the afterimage of a water droplet appears to the viewer as a gradient of colors extending along the actual direction of the droplet's fall. Utilizing this principle, a single water droplet could emit multiple colors, and the shape of its afterimage could also be altered.

[0041] Figure 3 This illustrates an example of a water droplet performance applying the aforementioned principles. Figure 3 In this example, assuming the light irradiation period T coincides with the water droplet formation period i, and focusing on the afterimage of a water droplet visible in one location, the pattern of repeating the light irradiation period from the 1st irradiation period T1 to the 7th irradiation period T7 is shown. Figure 3 In the example, although it appears to the audience as if a drop of water is floating, expanding, and moving up and down in front of them, in reality, only 7 drops of water pass in front of the audience's eyes between the first illumination cycle T1 and the seventh illumination cycle T7.

[0042] That is, at Figure 3 In the example, during the first illumination cycle T1, although light is irradiated onto the water droplets from interval p1 to interval p6, no light is irradiated in the subsequent intervals. In the following description, the intervals irradiated onto the water droplets will be called "lit intervals," and the intervals not irradiated will be called "extinguished intervals." After the second illumination cycle T2, the lit intervals are gradually shifted to later intervals, and the number of lit intervals decreases. Then, the lit intervals reach the final interval p6 in the fourth illumination cycle T4. 10 Its number also becomes minimal. After the 5th illumination cycle T5, conversely, the illuminated intervals are shifted step-by-step towards the previous intervals, and the number of the transmission intervals increases. Then, the illuminated intervals return to the same level as in the 1st illumination cycle T1 in the 7th illumination cycle T7. By repeating this operation, as... Figure 3 As shown, to the viewer, it appears as a drop of water floating, expanding, and moving up and down in front of their eyes.

[0043] Figure 4 This is another example of a water droplet performance. Figure 4In the example, during the first illumination cycle T1, intervals p1 to p6 are designated as illuminated intervals, and subsequent intervals are designated as extinguished intervals. After the second illumination cycle T2, the illuminated intervals are progressively shifted towards subsequent intervals. Furthermore, similar to the fourth illumination cycle T4, when the illuminated interval has reached the final interval p6... 10 In this case, by initially setting intervals p1 and p2 as illuminated intervals, the total number of illuminated intervals is always fixed. By repeatedly performing this operation, as... Figure 4 As shown, to the viewer, the water droplets appear to be slowly falling in front of them at a slower speed than free fall.

[0044] Figure 5 This is yet another example of a water droplet performance. Figure 5 In the example, during the first irradiation cycle T1, the interval from p1 to p4 is designated as the first lighting interval, the interval from p5 to p8 is designated as the extinguishing interval, and the interval from p9 to p... 10 This is the second illumination zone. After the second illumination cycle T2, the first illumination zone shifts to the subsequent zones in stages. In contrast, the second illumination zone looks like a water droplet that initially splits into two, then merges again and splits once more.

[0045] The above from Figures 3 to 5 The water droplet performance shown is only one example. By applying the principles of this invention, various variations of the performance can be executed.

[0046] The water droplet performance system 100 of the present invention can be used as a large system for water spraying or stage use, or as a small system for tabletop or portable use.

[0047] Figure 6 This illustration shows an embodiment in which the light-emitting elements of the illumination device 20 are arranged adjacent to the nozzles 15 of the multiple droplet generating devices 10. In this embodiment, each illumination device 20 illuminates light in a nearly vertically downward direction along the falling direction of the water droplets W. In this case, the color of a line of water droplets W emitted from a certain nozzle 15 can be changed by illuminating a single illumination device 20. Furthermore, although not shown in the illustration, by pre-positioning the light-emitting element directly below the emission port of the nozzle 15 and illuminating light in a vertically upward direction, a beam of light can also be illuminating a line of water droplets W emitted from a certain nozzle 15.

[0048] In addition, such as Figure 6 As shown, by aligning the nozzle 15 and the lighting device 20 in a straight line, a simulated two-dimensional display can also be constructed.

[0049] Figure 7 This represents yet another implementation of the water droplet performance system 100. For example... Figure 7As shown, by arranging the lighting device 20 in a three-dimensional configuration adjacent to the nozzle 15, a simulated three-dimensional display can also be constructed. For example... Figure 7 As shown, by arranging multiple lighting devices 20 and multiple nozzles 15 at the top, and causing water droplets W to fall downwards from the nozzles 15, a performance space can be created where illuminated water droplets cascade down. Since there are no pillars or other obstructions in this space, it is easy for people to enter.

[0050] Figure 8 This is a reference example of a waterdrop performance system. Figure 8 The water droplet performance system 100 shown is not included within the technical scope of the invention in claim 1, but is disclosed herein by reference. Furthermore, the applicant may amend the scope of the invention claims, etc., to... Figure 8 The water droplet performance system 100 shown may be included within the scope of the invention; however, the intention to obtain a patent for this part is reserved for future purposes.

[0051] exist Figure 8 In the example shown, the lighting device 20 illuminates the water droplets W generated by the water droplet generating device 10 and falling in the air with a stroboscopic light. The lighting device 20 includes, for example, a support column 21 and a plurality of light-emitting elements 22 arranged on the support column 21. Each light-emitting element 22 is preferably a multi-color light-emitting element with multiple LEDs. Furthermore, the plurality of light-emitting elements 22 are arranged along the movement path of the water droplets W. For example, as... Figure 8 In the example shown, when the water droplet W falls vertically, multiple light-emitting elements 22 are arranged vertically along the water droplet W. Furthermore, for example, when the water droplet W moves along a parabolic trajectory, the multiple light-emitting elements 22 can also be arranged parabolically along the water droplet W. Thus, the lighting device 20 can be configured to simultaneously illuminate multiple water droplets W falling from the air using multiple light-emitting elements 22. In this way, Figure 8 In the example shown, although compared to Figure 1 The configuration of the example lighting device 20 is different, but regarding other components, it is basically the same. Figure 1 The examples are the same.

[0052] In this specification, for the purpose of illustrating the content of the present invention, reference has been made to the appendix. Figure 1 The embodiments of the present invention will be described below. However, the present invention is not limited to the above embodiments, and also includes modifications or improvements that are obvious to those skilled in the art based on the matters described in this specification.

[0053] Explanation of reference numerals in the attached figures

[0054] 10: Water droplet generating device

[0055] 11: Water storage tank

[0056] 12: Pump

[0057] 13: Piping

[0058] 14: Slot

[0059] 15: Nozzle

[0060] 16: Vibrator

[0061] 17: Vibrating plate

[0062] 18: Exhaust valve

[0063] 20: Lighting device

[0064] 21: Pillar

[0065] 22: Light-emitting element

[0066] 30: Control device

[0067] 100: Waterdrop Performance System

[0068] W: Water Drop

Claims

1. A water droplet performance system, characterized in that, It comprises: a water droplet generating device that intermittently generates one water droplet in each cycle of a predetermined period; and an illumination device that illuminates the water droplet with light in the predetermined period. The predetermined period is set to be shorter than the human time resolution. The lighting device, Illuminate the path of the water droplet; When the predetermined period is divided into multiple intervals in time, the light emission state is controlled in each interval, and the water droplet is continuously irradiated with light in at least two of the multiple intervals, so that the afterimage of the water droplet is visually recognized by the audience as extending along the actual falling direction of the water droplet.

2. The water droplet performance system according to claim 1, characterized in that, The lighting device can control the color of the emitted light in each of the said intervals.

3. The water droplet performance system according to claim 1, characterized in that, The lighting device includes multiple light-emitting elements; The half-light distribution angle of the light-emitting element is less than 20 degrees.

4. A method for creating a water droplet performance, characterized in that, In a predetermined period, a water droplet is generated intermittently in each period, and light is irradiated onto the water droplet along its movement path at the predetermined period. The predetermined period is set to be shorter than the human time resolution. The predetermined period is divided into multiple intervals in time, and the light emission state is adjusted in each interval. The water droplet is continuously irradiated with light in at least two of the multiple intervals, so that the afterimage of the water droplet is visually recognized by the audience as an image extending along the actual falling direction of the water droplet.

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