CN100591987C - A light distribution method, a light distribution cup and a street lamp using the light distribution cup - Google Patents

Abstract

The invention discloses a light distribution method, a light distribution cup and a road lamp using the light distribution cup. The light distribution method comprising following steps: light ray emitted by a light source partially irradiates outside the light distribution cup to composing a direct light composing rectangular main light spot, and partially irradiates onto the inner wall of the light distribution cup and is reflected outside the light distribution cup to compose a reflective ray composing even rectangular overlapping light spot corresponding to the main light spot shape. The light distribution cup comprises a rectangular cup opening and a cup wall provided with a freeform surface design, and the scattering angle of the cup wall reflective ray is same with that of the cup opening ray. The road lamp comprises a lamp pole, the light distribution cup assembled on the top of the lamp pole, a light source is disposed in the light distribution cup, and the cup opening long edge of the light distribution cup is provided in the same direction of the road. According to the invention, light spots are even, and road lamp amount is reduced. The inventive method is suitable for designs of road lamps and relating lamps.

Description

A light distribution method, a light distribution cup and a street lamp using the light distribution cup

technical field

The present invention relates to an optical path design method, in particular to a light distribution method; the present invention also relates to a lighting fitting for realizing the method, in particular to a light distribution cup; finally, the present invention relates to a lamp, a A street lamp using the above light distribution cup.

Background technique

A street lamp generally includes a lamp post, a lamp cap installed on the top of the lamp post, a light distribution cup is installed in the lamp cap, and a light source is arranged in the light distribution cup. The light emitted by the point light source radiates to the three-dimensional space in the form of a Lambertian body. For road lighting, we only need to illuminate in the next direction. Therefore, the function of the light distribution cup is to diverge the point light source upward and horizontally. The light is reflected downwards to improve lighting efficiency. The existing light distribution cup is generally trumpet-shaped, and the light will form a circular spot after passing through the light distribution cup. The design of the reflection wall of the light distribution cup with this structure is not scientific enough, and part of the light needs to go through two or more times. Only after the first reflection can it be emitted out of the light distribution cup, and even part of the light cannot be reflected, which causes a waste of light energy to a certain extent; moreover, because this kind of light distribution cup irradiates the road surface to form a circular spot, in this way, the light distribution Part of the light reflected by the cup will irradiate the outside of the road, and some will overlap with the street lamps on the other side of the road, resulting in a waste of light energy; Only by installing more street lamps per unit length can the continuity of road brightness be maintained.

Contents of the invention

The technical problem to be solved by the present invention is to provide a light distribution method, which can convert the lambertian radiation light emitted by the point light source into uniformly illuminated rectangular light spots.

The present invention solves the above-mentioned technical problems through the following technical solutions:

A light distribution method, comprising a light source and a light distribution cup, part of the light emitted by the light source is directly irradiated to the outside of the light distribution cup to form a direct light, and part of the light is irradiated to the inner wall of the light distribution cup and then reflected to the outside of the light distribution cup to form a reflected light; The light has a predetermined scattering angle and forms a rectangular main spot. The scattering angle of the reflected light in the length direction of the main spot is the same as that of the direct light. The scattering angle of the reflected light in the width direction of the main spot is the same as that of the direct light. The scattering angles of the light rays are the same, and the reflected light forms a uniform rectangular superimposed light spot corresponding to the shape of the main light spot.

In addition, the present invention can also be further improved by adding the following technical solutions:

In the length direction of the light spot, the scattering angle of the direct light is 30°, and the scattering angle of the reflected light is also 30°.

In the width direction of the light spot, the scattering angle of the direct light is 62°, and the scattering angle of the reflected light is also 62°.

The technical problem to be solved by the present invention is to provide a light distribution cup capable of emitting rectangular light spots, high light output rate, high brightness and uniform illumination.

The present invention solves the above-mentioned technical problems through the following technical solutions:

A light distribution cup, including a cup bottom and a cup wall. The inner surface of the cup bottom and the cup wall is provided with a reflective layer. The center of the cup bottom is used to install a light source. The cup wall surrounds a rectangular cup mouth. The scattering angle above is a predetermined value, and the inner surface of the cup wall is a free-form surface calculated by the integral iteration method according to Snell's law. The scattering angle of the reflected light in the length direction of the cup wall is the same as that of the cup opening. The scattering angle of the reflected light is the same as the scattering angle of the cup mouth.

The beneficial effects of the present invention are: because the present invention transforms the point light source into a rectangular spot for emission, it is beneficial for the present invention to be used in a narrow and long space; the light reflected by the inner wall of the light distribution cup forms a rectangle corresponding to the shape of the main spot The light spots are superimposed, so that the lighting efficiency of the present invention is higher, the lighting brightness is higher, and the light spots are more uniform.

The above technical solution can also be further improved through the following additional technical features:

The scattering angle in the length direction of the cup mouth is 30°, and the scattering angle of the light reflected in the length direction of the cup wall is 30°.

The scattering angle in the width direction of the cup mouth is 62°; the scattering angle of the reflected light in the width direction of the cup wall is 62°.

The reflective layer is a dielectric film or a metal film.

The reflective layer is an aluminum electroplating layer.

Another technical problem to be solved by the present invention is to provide a street lamp which can form a rectangular light spot on the ground, has high light output brightness and more uniform illumination.

The present invention solves the above-mentioned technical problems through the following technical solutions:

A street lamp, comprising a light pole, a light distribution cup installed on the top of the light pole, a light source is arranged in the light distribution cup, the mouth of the light distribution cup is rectangular, and the scattering angle in the length direction and width direction of the light distribution cup is a predetermined value , the inner surface of the cup wall is a free-form surface calculated by the integral iterative method according to Snell's law. The scattering angle of the cup mouth is the same, and the length direction of the cup mouth is in the same direction as the road direction.

The beneficial effects of the present invention are: because the light distribution cup can produce a rectangular, high-brightness, uniformly illuminated light spot, compared with a circular light spot, the distance between the two light poles can be farther apart under the same illumination intensity , so that the number of street lamps installed on the road per unit length can be reduced, achieving the effect of saving the number of street lamps and energy saving.

The scattering angle in the length direction of the cup mouth is 30°, and the scattering angle of the light reflected in the length direction of the cup wall is 30°.

The scattering angle in the width direction of the cup mouth is 62°; the scattering angle of the reflected light in the width direction of the cup wall is 62°.

A plurality of light distribution cups are installed on the top of the light pole, and a light source is arranged in each light distribution cup.

The plurality of light distribution cups are arranged neatly or staggeredly.

The light source is a high-power LED.

A light distribution plate is also arranged in front of the light distribution cup.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the present invention will be further described,

Fig. 1 is a schematic structural view of the light distribution cup of the present invention;

Fig. 2 is a structural schematic diagram of the section of the inner wall of the light distribution cup of the present invention;

Fig. 3a is a schematic diagram of the light distribution scheme in the width direction of the light distribution cup of the present invention;

Fig. 3b is a schematic diagram of the light distribution scheme in the longitudinal direction of the light distribution cup of the present invention;

Fig. 4 is the mathematical model of the curved surface section curve of the cup wall of the light distribution cup of the present invention;

Fig. 5 is a schematic structural view of the first embodiment of the street lamp of the present invention;

Fig. 6 is one of the structural schematic diagrams of the second embodiment of the street lamp of the present invention;

Fig. 7 is the second structural schematic diagram of the lamp holder of the second embodiment of the street lamp of the present invention;

Fig. 8 is the third structural schematic diagram of the lamp holder of the second embodiment of the street lamp of the present invention.

Detailed ways

Referring to Fig. 1 and Fig. 2, the structure and manufacturing method of the light distribution cup 1 of the present invention are first introduced, and then the principle of the light distribution method of the present invention and the structure of the street lamp using the light distribution cup 1 are explained. The light distribution cup 1 is a rectangular shell with a rectangular bottom 11 and a light source mounting hole in the center. In the present invention, the light source should be a point light source 14, as long as the light emitted by it is Lambertian. Radiation is sufficient. As far as the prior art is concerned, high-power LEDs, tungsten lamps or fluorescent lamps can be selected as the light source. The four cup walls 12, 13 surround a rectangular cup mouth, and the bottom 11 of the cup and the inner surfaces of the cup walls 12, 13 are all provided with a reflective layer. The reflective layer can be a dielectric film such as TiO ₂ , SiO ₂ or MgF ₂ , or It is a metal film such as aluminum plating and silver plating, which can also be directly polished and smoothed on the bottom 11 of the cup and the walls 12 and 13 of the cup, or processed by other methods that can ensure that the curved surface achieves a considerable reflective effect.

The design of the cup walls 12 and 13 should be able to reflect the light emitted by the point light source 14 in the center of the cup bottom 11 to the outside of the light distribution cup 1 at one time, so as to reduce the loss of light energy caused by the multiple reflections of the light in the light distribution cup 1. According to Sine This can be achieved through the reasonable design of the included angle between the cup walls 12, 13 and the cup bottom 11 according to Carr's law. Of course, in order to control the angle of the reflected light to change within a small range, the final control of the light spot projected by the light distribution cup 1 The shape and the brightness of each region of the light spot, the cup walls 12 and 13 of the present invention adopt a free-form surface design.

The structure and design principle of the light distribution cup 1 of the present invention will be described below by taking the design of the cup wall 13 in the length direction of the light distribution cup 1 as an example. With reference to Figure 3b and Figure 4, a two-dimensional Coordinates, the vertical direction is the Y axis, and the horizontal direction is the X axis. Firstly, the determination of the scattering angle in the length direction of the main spot is explained. The so-called scattering angle in the length direction of the main spot is the maximum angle between the light directly emitted in the length direction of the light distribution cup and the axis of the light distribution cup. It can also be said that it just crosses the light distribution cup The angle between the light directly emitted from the edge in the length direction and the axis of the light distribution cup can be similarly obtained as the scattering angle in the width direction of the main spot. The scattering angles in the length direction and width direction of the main light spot have a great influence on the shape and brightness of the light spot. When the distance between the light source 14 and the target illumination object is constant, the larger the scattering angle in the length direction and width direction is , the larger the area of the spot, the lower the brightness, and vice versa, designers can use the Pythagorean theorem to determine according to actual needs, for example, if the present invention is applied to street lamps, the outgoing angle can be referred to as 30. The installation height is 12M, and the light spot with a width of 13.8M is obtained.

The determination of the reflected light scattering angle is explained again. The so-called scattered angle of reflected light refers to the included angle between the reflected light irradiated to each point on the inner wall 13 of the light distribution cup 1 and the axis of the light distribution cup 1. In the present invention, the reflected light Due to the reflection of the four sides of the cup wall 13, the superimposed spot must be a rectangle similar to the main spot, and then the angle of the reflected light at each point on the cup wall 13 is controlled by designing the curvature of the cup wall 13, so as to control the superimposed spot The shape and brightness of the light distribution cup allow the superimposed light spot to be superimposed on the weaker peripheral light area of the main light spot, and finally make the brightness of the light spot obtained by the light distribution cup 1 relatively uniform. First determine the maximum exit angle, that is, the angle between the reflected light irradiated on the uppermost edge of the cup wall 13 and the axis of the light distribution cup 1. The purpose of the present invention is to allow the superimposed light spot to be superimposed on the weaker peripheral light area of the main light spot. At this time , the maximum exit angle should be equal to the exit angle of the main spot, so that the light that strikes the edge of the left cup mouth can be reflected to the rightmost edge of the main spot; The exit angle of the reflected light is proportionally reduced, and the reflected light moves toward the inside of the main spot. In this way, a superimposed spot that is strengthened from the outside to the inside of the main spot can be formed, so that the overall brightness of the final spot is uniform.

The curved surface of the cup wall that realizes the above-mentioned reflective function is actually a free-form surface calculated by the integral iteration method according to Snell's law. Referring to Figure 4, the curve of the cross-section of the curved surface satisfies the following equations:

$\mathrm{<span\; class="notranslate">\; Tan</span>}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; the\; y</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}}}{{\mathrm{<span\; class="notranslate">\; x</span>}}_{\mathrm{<span\; class="notranslate">\; a</span>}}}$

$\frac{{\mathrm{<span\; class="notranslate">\; \&Delta;y</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}{{\mathrm{<span\; class="notranslate">\; \&Delta;x</span>}}_{\mathrm{<span\; class="notranslate">\; no</span>}}}<span\; class="notranslate">\; =</span>\mathrm{<span\; class="notranslate">\; the\; tan</span>}<span\; class="notranslate">\; (</span>\frac{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; -</span><span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&beta;</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; )</span><span\; class="notranslate">\; )</span>$

$\mathrm{<span\; class="notranslate">\; \&beta;</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}}<span\; class="notranslate">\; +</span>\frac{\mathrm{<span\; class="notranslate">\; 1</span>}}{\mathrm{<span\; class="notranslate">\; 2</span>}}<span\; class="notranslate">\; (</span>\mathrm{<span\; class="notranslate">\; \&alpha;</span>}<span\; class="notranslate">\; -</span>\mathrm{<span\; class="notranslate">\; \&theta;</span>}<span\; class="notranslate">\; )</span>$

y _n+1 =y _n +Δy _n

x _n+1 ＝x _n +Δx _n

In the present invention, the height of the cup wall 13 (that is, the Y-axis coordinate of the cup opening) is 10MM, the width of the cup bottom is 6MM, and the light emitting angle of the main spot is 30°. To the bottom of the cup, the coordinates of the points on the curve are determined by taking the 30°～0° proportional gradient as an example, and the height of the cup wall is divided into 1000 points, so the integral is:

Δy=0.01

Δθ=0.03°

In the above formula, n is the current point of numerical calculation, n+1 is the next point of numerical calculation, Δx, Δy are the traces of changes in the x and y directions of the curve. From the initial conditions:

α ₀ =0

${\mathrm{<span\; class="notranslate">\; \&beta;</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&pi;</span>}}{\mathrm{<span\; class="notranslate">\; 4</span>}}$

x ₀ =3

y ₀ =0

From the above equations, the coordinates of each point on the curve can be calculated from bottom to top by the numerical calculation method of integral iteration, for example, the coordinates of the first point are (3.00577, 0.01), and the coordinates of the second point are (3.01152, 0.02 ), the coordinates of the third point are (3.01726, 0.03)...the coordinates of the last point are (5.77350, 10). In this example, the Y direction is divided into 1000 points for integration. According to the needs of actual accuracy, it can be expanded or expanded accordingly. Narrow down points. Similarly, the free-form surface of the cup wall in the width direction of the light distribution cup can be designed. Taking the light emitting angle of the main light spot in the width direction of the light distribution cup as 62°, the light emitting angle of the reflected light irradiated on the inner wall 13 of the light distribution cup mouth is 62°-30° from the cup mouth to the bottom of the cup as an example. , when the installation height of the finally obtained light distribution cup 1 is 12M, a rectangular light spot of 40MX13.8M with uniform illumination is obtained. The above point-taking calculations can be assisted by computer software, and then each point is connected into a smooth curve, and then the model is generated by computer drawing software, and finally it can be manufactured by CNC machine tool processing or precision casting.

Referring to Fig. 5, a street lamp adopting the above-mentioned light distribution cup 1, the street lamp has two implementation modes, one is to install the above-mentioned light distribution cup 1 on the top of the light pole 2, and the light distribution cup 1 is provided with a light source 14, The light source can be a high-pressure sodium lamp or a high-power LED, and the rectangular cup mouth of the light distribution cup 1 is along the direction of the road. In this way, the length direction of the rectangular light spot extends along the direction of the road. Compared with the circular light spot, it avoids the overlapping of the light spot in the center of the road and the projection of the part of the light spot to the outside of the road. Under the same lighting intensity, the distance between the two light poles can be separated. Farther, so that the number of street lamps installed on the road per unit length can be less, so as to save the number of street lamps and save energy. In addition, it is also possible to add a light distribution plate 15 with an astigmatism structure in front of the used reflective light distribution cup, which can play an anti-glare function.

Referring to Figures 6, 7 and 8, another embodiment of the street lamp can also be provided with a lamp holder 3 on the top of the lamp pole, and a plurality of light distribution cups 1 as described above are arranged inside the lamp holder 3, and each light distribution cup 1 Each is provided with a light source 14, and the long sides of all the cup mouths are parallel to the direction of the road. The arrangement of the plurality of light distribution cups 1 can be a staggered arrangement as shown in Figure 7, or it can be as shown in Figure 8 Neatly arranged.

The size and brightness of the light spot are related to the height of the street lamp and the number of LEDs. The following are the test data of street lamps with various heights and LED numbers of the present invention. Users can choose according to actual needs in the implementation design.

Note: The luminous flux of the above lamps is the data obtained from the test of one lamp. The selected LED is 1W LED. The luminous flux is 70~80LM/piece.

Claims (15)

1, a kind of light distributing method comprises light source and luminous intensity distribution cup, it is characterized in that: the light portion that light source sends shines directly into the luminous intensity distribution cup and constitutes direct projection light outward, and part shines luminous intensity distribution cup inwall back reflection and constitute reflection ray outside the luminous intensity distribution cup; Described direct projection light is formed the rectangle main spot, and have the angle of scattering of predetermined length and the angle of scattering on the width, described reflection ray is identical in the angle of scattering of the length direction of main spot with direct projection light in the length direction angle of scattering of main spot, the angle of scattering of described reflection ray on the width of main spot is identical in the angle of scattering of the width of main spot with direct projection light, and reflection ray is formed the uniform rectangle stack hot spot corresponding with described main spot shape.

2, a kind of light distributing method according to claim 1 is characterized in that: on the length direction of hot spot, the angle of scattering of direct projection light is 30 °, and the angle of scattering of reflection ray is similarly 30 °.

3, a kind of light distributing method according to claim 1 is characterized in that: on the width of hot spot, the angle of scattering of direct projection light is 62 °, and the angle of scattering of reflection ray is similarly 62 °.

4, a kind of luminous intensity distribution cup, at the bottom of comprising glass and wall of cup, the cup end and wall of cup inner surface are provided with reflector layer, cup end central authorities are used to install light source, wall of cup surrounds rectangular rim of a cup, it is characterized in that: the length direction of rim of a cup and the angle of scattering on the width are a predetermined value, the wall of cup inner surface is the free form surface that calculates with iterative Integral Method according to Snell's law, the angle of scattering of the reflection ray of wall of cup length direction is identical with the angle of scattering of rim of a cup length direction, and the angle of scattering of the reflection ray on the wall of cup width is identical with the angle of scattering of rim of a cup width.

5, a kind of luminous intensity distribution cup according to claim 4, it is characterized in that: the angle of scattering on the rim of a cup length direction is 30 °, the angle of scattering of wall of cup length direction reflection ray is 30 °.

6, a kind of luminous intensity distribution cup according to claim 4, it is characterized in that: the angle of scattering on the rim of a cup width is 62 °; The angle of scattering of wall of cup width reflection ray is 62 °.

7, according to each described a kind of luminous intensity distribution cup of claim 4 to 6, it is characterized in that: described reflector layer is deielectric-coating or metal film.

8, according to each described a kind of luminous intensity distribution cup of claim 4 to 6, it is characterized in that: described reflector layer is the electroplated aluminum layer.

9, a kind of street lamp, comprise lamp stand, be installed in the luminous intensity distribution cup at lamp stand top, be provided with light source in the luminous intensity distribution cup, it is characterized in that: described luminous intensity distribution cup rim of a cup is a rectangle, angle of scattering on its length direction and the width is a predetermined value, the wall of cup inner surface is the free form surface that calculates with iterative Integral Method according to Snell's law, the angle of scattering of reflection ray is identical with the angle of scattering of rim of a cup length direction on the length direction of wall of cup, the angle of scattering of reflection ray is identical with the angle of scattering of rim of a cup width on the width of wall of cup, and the length direction of rim of a cup and road direction are in the same way.

10, a kind of street lamp according to claim 9 is characterized in that: the angle of scattering on the described rim of a cup length direction is 30 °, and the angle of scattering of wall of cup length direction reflection ray is 30 °.

11, a kind of street lamp according to claim 9 is characterized in that: the angle of scattering on the described rim of a cup width is 62 °; The angle of scattering of wall of cup width reflection ray is 62 °.

12, according to each described a kind of street lamp of claim 9 to 11, it is characterized in that: described lamp stand top is equipped with a plurality of luminous intensity distribution cups, respectively is provided with a light source in each luminous intensity distribution cup.

13, a kind of street lamp according to claim 12 is characterized in that: described a plurality of luminous intensity distribution cup proper alignment or be staggered.

14, according to each described a kind of street lamp of claim 9 to 11, it is characterized in that: described light source is a great power LED.

15, according to each described a kind of street lamp of claim 9 to 11, it is characterized in that: the front of described luminous intensity distribution cup also is provided with the luminous intensity distribution plate.

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