Standard flicker device for integrating sphere light source

Abstract

The utility model designs a standard flickering device for an integrating sphere light source, which is characterized in that a widened light chopper chassis and a light chopper circular hole plate are arranged in the middle of a light chopper upper cover, a plurality of circular holes are uniformly distributed on the edge of the light chopper circular hole plate along a circumference, and the light chopper circular hole plate is driven by a motor. The widened light chopper base plate and the light chopper upper cover are respectively provided with a coaxial through hole, the axial projection line of the circle center of each through hole perpendicularly intersects with the circumference formed by the circle center of the round hole in the edge of the light chopper round hole plate, a lamp sleeve is arranged at the position of the through hole in the light chopper upper cover, and a tungsten lamp is installed in the lamp sleeve. The utility model has the advantage of solving the problems that the accuracy of the flicker parameter of the light source stroboflash tester cannot be tested and the source cannot be traced. Different flicker frequencies are generated by adjusting the rotating speed of the circular hole plate of the light chopper through the motor, and meanwhile, the rotating speed is monitored through the tachometer, so that an accurate flicker frequency value is obtained.

Description

TECHNICAL FIELD

[0001] The utility model relates to a standard flicker device for integrating sphere light source. BACKGROUND

[0002] The light output variation of lighting products over time is commonly known as "flicker" or "stroboscopic effect", and the flicker referred to in the present application is defined according to CIE TN 006:2016 as the visual perception of light fluctuation (Temporal Light Artefact) which includes flicker (flicker) and stroboscopic effect (stroboscopic effect) in a narrow sense. With the popularity of LED lighting products, it has become a hot topic of concern for both consumers and the lighting industry in recent years. In particular, the 2017 CCTV 3.15 Evening highlighted the flicker of LED lamps as the first consumer warning, sparking debate in the domestic lighting industry. Excessive flicker of light sources can cause more obvious harm to patients with epilepsy, autism and headaches, and also cause visual fatigue and reduced visual function in observers. Therefore, it is particularly important to determine whether the flicker index of a lighting product is qualified. The Lighting Handbook of IES uses fluctuation depth and flicker index to measure the flicker characteristics of lamps and lanterns. IEEE Std 1789-2015 first uses fluctuation depth PF (Percent Flicker or Modulation depth) and flicker index (Flicker Index) to evaluate the flicker of light sources. Appendix A of GB / T 9473-2017 Performance Requirements for Reading and Writing Desk Lamps references IEEE Std 1789 to evaluate the flicker of desk lamps. Mandatory standard GB 40070-2021 Health Requirements for Myopia Prevention and Control of Children and Adolescents Learning Supplies requires that the fluctuation depth of the light output waveform of classroom lighting fixtures and reading and writing desk lamps be within the non-significant impact area of IEEE Std 1789. Since the national standard requirements for the flicker characteristics of lamps and lanterns have been gradually released in recent years, most of which refer to international standards, various light source stroboscopic testers have also appeared on the market. However, due to the lack of corresponding calibration specifications and the absence of standard flicker light sources, the flicker parameters (frequency, fluctuation depth, flicker index) of such light source stroboscopic testers cannot be well traced, and the accuracy and reliability of the measured flicker parameter values cannot be guaranteed. SUMMARY

[0003] The utility model discloses to the above -mentioned problem of the standard flicker device for integrating sphere light source is provided for the existing technology stroboscope without standard flicker light source, a kind of standard flicker device for integrating sphere light source is provided, it is characterized in that, there is a widened light chopper chassis, a shaft hole is equipped on widened light chopper chassis, motor shaft sleeve is placed in the shaft hole, the upper portion of motor shaft sleeve is connected with light chopper round hole plate, light chopper round hole plate is located on the face of widened light chopper chassis, light chopper upper cover is provided on the upper portion of light chopper round hole plate, the edge of light chopper upper cover is fixedly connected with widened light chopper chassis, motor is provided on light chopper upper cover, motor shaft is fixedly connected with motor shaft sleeve through the through hole on light chopper upper cover, a plurality of round holes are evenly arranged on the edge of the light chopper round hole plate along a circumference, a coaxial through hole is formed in widened light chopper chassis and light chopper upper cover, the circumferential line formed by the circumferential projection line of the center of the through hole and the center of the round hole on the edge of light chopper round hole plate is perpendicular, lamp sleeve is provided at the through hole of light chopper upper cover, tungsten lamp is installed in lamp sleeve. The widened light chopper chassis is connected with sheet metal L-shaped fan bracket, and the fan is installed on the sheet metal L-shaped fan bracket. The lamp sleeve is nested in a lamp holder heat sink outside. The fan faces the lamp sleeve. The number of the round holes on the edge of the light chopper round hole plate is 18 or 20. The through hole on the widened light chopper chassis is connected with the incident hole of the integrating sphere light source. The utility model has the advantages of: 1. The accuracy of the flicker parameter of the stroboscope cannot be tested and traced. 2. The motor adjusts the rotating speed of the light chopper round hole plate to generate different flicker frequencies, and the rotating speed is monitored using a tachometer to obtain accurate flicker frequency values. 3. The number, shape and diameter of the round holes of the light chopper round hole plate can determine the waveform, fluctuation depth and flicker index of the output light, and the rotating speed of the light chopper round hole plate only affects the flicker frequency and does not affect the waveform, fluctuation depth and flicker index. The diameter of the round hole should not be greater than the diameter of the light source, and the output light intensity is proportional to the light transmission area in the current state of the light chopper. The light transmission area can be obtained by integration operation. BRIEF DESCRIPTION OF DRAWINGS

[0004] Figure 1 It is the axial decomposition schematic view of the structure of the utility model,

[0005] Figure 2 It is the light chopper round hole plate structure schematic view (20 holes) of the utility model,

[0006] Figure 3 It is the light chopper round hole plate structure schematic view (18 holes) of the utility model,

[0007] Figure 4 It is the plane schematic view of the widened light chopper chassis of the utility model,

[0008] Figure 5This is a schematic diagram of the upper cover of the chopper of this utility model.

[0009] Figure 6 This is a schematic diagram illustrating the basic principle of this utility model.

[0010] Figure 7 A diagram illustrating the definition of fluctuation depth and flicker index.

[0011] Figure 8 The output waveform of the 18-hole chopper circular aperture plate of this utility model is shown (the horizontal dashed line represents the average light intensity).

[0012] Figure 9 The output waveform of the 20-hole chopper circular aperture plate of this utility model is shown (the horizontal dashed line represents the average light intensity). Detailed Implementation

[0013] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings, so that those skilled in the art can more clearly understand how to practice this utility model. Although this utility model has been described in conjunction with its preferred embodiments, these embodiments are merely illustrative and not intended to limit the scope of this utility model.

[0014] The figure shows a standard scintillator device for an integrating sphere light source, characterized by a widened chopper base 1, a shaft hole 2 on the widened chopper base, a motor bushing 3 placed in the shaft hole, a chopper circular hole plate 4 connected to the upper part of the motor bushing, the chopper circular hole plate being located on the surface of the widened chopper base, a chopper upper cover 5 being provided on the upper part of the chopper circular hole plate, the edge of the chopper upper cover being fixedly connected to the widened chopper base, and a motor being provided on the chopper upper cover. 6. The motor shaft is fixedly connected to the motor shaft sleeve through the through hole 7 on the upper cover of the chopper. Several circular holes 8 are evenly arranged along the circumference on the edge of the chopper's circular hole plate. A coaxial through hole 9 is opened on both the widened chopper base and the upper cover of the chopper. The axial projection line of the center of the through hole intersects perpendicularly with the circumference line formed by the centers of the circular holes on the edge of the chopper's circular hole plate. A lamp sleeve 10 is installed at the through hole on the upper cover of the chopper, and a tungsten lamp 11 is installed inside the lamp sleeve. A sheet metal L-shaped fan bracket 12 is connected to the widened chopper base, and a fan 13 is installed on the sheet metal L-shaped fan bracket. A lamp holder heat sink 14 is nested on the outside of the lamp sleeve. The fan faces the lamp sleeve. The number of circular holes on the edge of the chopper's circular hole plate is 18 or 20. The through hole on the widened chopper base connects to the integrating sphere light source entrance hole 15.

[0015] In operation, the motor is started, and the rotating speed of the motor can be adjusted, and generally 30 revolutions per minute, 300 revolutions per minute, and 3000 revolutions per minute are adopted. The upper cover of the light chopper is provided with an observation hole 16, and the actual rotating speed of the light chopper circular hole plate can be measured by using a tachometer. Then, the tungsten lamp is lighted, the light of the tungsten lamp is introduced into the light chopper circular hole plate through the through hole in the upper cover of the light chopper, and then is emitted from the through hole in the widened bottom plate of the light chopper into the light source entrance hole of the integrating sphere. After being diffusely reflected in the integrating sphere, the light is emitted from the light source exit hole of the integrating sphere, so that the emitted light is uniform and does not have waveform distortion, and can be used as a standard flicker device for detection.

[0016] The utility model discloses a standard flicker device for integrating sphere light source, through mechanical rotating type light chopper structure, can produce stable flicker frequency, in addition can provide standard fluctuation depth and flicker index, provides technical basis for the measurement and test of light source stroboscope, and the accuracy of its frequency value can also be traced to the upper level further through tachometer, effectively solve the traceability problem of flicker parameter, and provide the guarantee for the health safety of the daily lighting environment of the majority of consumers (especially the youth). Its function is mainly adjusting light source flicker frequency and light and dark time proportion, and is installed between incident light source and integrating sphere. The mechanical rotating type light chopper design schematic diagram is as shown in Figure 6 The open hole circle and the reference circle are tangent and arranged at intervals, and all the centers are located on the annulus with the rotated shaft as the center. The open hole diameter a is matched with the light source diameter, and the reference circle diameter b determines the minimum light intensity and the duration time. When a > b, the minimum light intensity will not decrease to 0; when a = b, the minimum light intensity will decrease to 0; and when a < b, the minimum light intensity will not only decrease to 0, but also last for a period of time. The specific open hole number can be adjusted and formulated according to the motor rotating speed range and the required flicker frequency range, and the utility model selects 18 open holes (a = b) and 20 open holes (a > b) two light chopper circular hole plates.

[0017] According to the definition of the fluctuation depth and the flicker index in IES The Lighting Handbook, as shown in Figure 7 The fluctuation depth, Wherein, A is the maximum output in a single cycle, and B is the minimum output in a single cycle. The flicker index, Wherein, A1 is the area greater than the average in a single cycle, and A2 is the area less than the average in a single cycle. The fluctuation depth of the 18-hole light chopper circular hole plate is 100%, and the flicker index is 0.3123; the fluctuation depth of the 20-hole light chopper circular hole plate is 86.09%, and the flicker index is 0.2624. The above values can be used to determine whether the measurement value of the measured light source stroboscope is accurate.

[0018] The chopping optical device round hole plate can be replaced, the utility model discloses only designed 18 holes and 20 holes chopping optical device round hole plate as example, can additionally process the chopping optical device round hole plate of different hole number according to actual need. The standard scintillation device connection integral sphere light source entrance hole is designed, and the light source is adjusted through the standard scintillation device, and then passes through the internal diffuse reflection of integral sphere and emits from integral sphere light source exit hole, so that the change of emitted light is uniform, and there is no waveform distortion. The heat dissipation module is designed at the light source, to avoid the light source from being burnt out for long time lighting.

Claims

1. A standard scintillation device for an integrating sphere light source, characterized in that, A widened chopper chassis has a shaft hole on it, in which a motor bushing is placed. A chopper circular hole plate is connected to the upper part of the motor bushing and is located on the surface of the widened chopper chassis. A chopper upper cover is provided on the upper part of the chopper circular hole plate, and the edge of the chopper upper cover is fixedly connected to the widened chopper chassis. A motor is provided on the chopper upper cover, and the motor shaft is fixedly connected to the motor bushing through a through hole on the chopper upper cover. Several circular holes are evenly arranged along a circumference on the edge of the chopper circular hole plate. A coaxial through hole is provided on both the widened chopper chassis and the chopper upper cover. The axial projection line of the center of the through hole intersects perpendicularly with the circumference line formed by the centers of the circular holes on the edge of the chopper circular hole plate. A lamp sleeve is provided at the through hole of the chopper upper cover, and a tungsten lamp is installed in the lamp sleeve.

2. A standard scintillator for an integrating sphere light source according to claim 1, characterized in that, A sheet metal L-shaped fan bracket is connected to the widened chopper chassis, and a fan is installed on the sheet metal L-shaped fan bracket.

3. A standard scintillator for an integrating sphere light source according to claim 1, characterized in that, The outer side of the lamp sleeve is nested in a lamp holder heat sink plate.

4. A standard scintillator for an integrating sphere light source according to claim 2, characterized in that, The fan faces the lamp cover.

5. A standard scintillator for an integrating sphere light source according to claim 1, characterized in that, The number of circular holes on the edge of the chopper's circular plate is 18 or 20.

6. A standard scintillator for an integrating sphere light source according to claim 1, characterized in that, The through hole on the widened chopper chassis is connected to the incident hole of the integrating sphere light source.

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