CN105757611B - Double ellipsoid reflector, LED light emission device and light fixtures - Google Patents

Abstract

The present invention proposes a double ellipsoidal reflector, comprising a reflector body consisting of two ellipsoidal parts, the two ends of each ellipsoidal part along the major axis are cut off from a plane parallel to the minor axis of the ellipse and containing the focal point, Wherein the end where the first focus is located is closed for accommodating components for emitting light, and the end where the second focus is located is empty to form a light exit port, so that light passes through it and is emitted from the light exit port. The present invention also proposes an LED lighting device, which includes two LED light sources, two primary light-gathering elements and double ellipsoid reflectors. The present invention further proposes an LED lighting device, which includes two groups of the aforementioned LED lighting devices. The invention also provides a lamp. The invention can realize the effect of using a low-power light source to emit high intensity in a narrow aperture.

Description

Double ellipsoidal reflector, LED lighting device and lamp

technical field

The invention relates to a double ellipsoid reflector, an LED light emitting device using the double ellipsoid reflector, and a lamp using the LED light emitting device.

Background technique

The aviation industry uses a type of strong light fixtures buried on the runway, such as runway lights and runway edge lights, to help pilots accurately locate the runway before the aircraft lands. This kind of lamp cannot protrude too much from the ground because it cannot cause bumps and bumps during aircraft taxiing. Therefore, the light outlet that can be used to project light is very small, generally less than 18mm. The lamps that guide the aircraft to land need stronger light. The average light intensity of the runway lights with a main projection angle of 11 degrees cannot be less than 10,000cd, and the light intensity requirements of the runway edge lights are slightly weaker. The high light intensity requirement creates a technical barrier for the application of LED light sources with small total luminous flux to runway navigation lights.

Traditional runway navigation lights generally use incandescent halogen light sources, which have high energy consumption and usually use 250W. The lifespan is short, the general lifespan is about 3000 hours, and the airport generally needs to be replaced at least three times a year. However, modern airports are very busy, and many airports can only perform maintenance and replacement between 2-5 o'clock in the morning, which brings high work intensity and complexity of arrangement.

Contents of the invention

The double ellipsoidal reflector, LED lighting device and lamp of the present application can well solve the above two problems. One of the objectives of the present invention is to provide an optical structure of an LED light source capable of emitting a light intensity value meeting the requirements for guiding an aircraft to land under a narrow light-emitting aperture. Another object of the present invention is to realize ground lighting with a light emitting device with low power consumption and long service life.

The present invention proposes a double ellipsoidal reflector, which includes a reflector body composed of two ellipsoidal parts, the shapes of the two ellipsoidal parts are basically the same, and the two ends of each ellipsoidal part along the long axis are parallel to The minor axis of the ellipse and the plane containing the focal point are truncated, wherein the end where the first focus is located is closed to accommodate components for lighting, and the end where the second focus is located is empty to form a light exit port, so that the light from it After passing through and shooting out, a part of the ellipsoid along the long axis of the two ellipsoids is also cut off respectively and the remaining ellipsoids touch each other along the edge to form an overlap, which is hollow,

The inner surface of the double ellipsoidal reflector is an ellipsoidal reflective surface, so that the light emitted by the light source is reflected and collected to the light outlet;

Wherein, the projected light from the first focal point as the main body of the light beam is directly projected to the light exit port, and the remaining divergent light from the first focal point will be reflected by the inner surface of each ellipsoid and emitted from the second focal point.

Wherein, the double ellipsoidal reflector is divided into two fully symmetrical upper and lower parts along the plane of the axes of the two ellipsoids, that is, each part is symmetrical in front and back, and one of the two parts can be integrally formed by casting technology. , because of its symmetrical structure, one of the two parts is reversed and docked with the other to form a complete double ellipsoidal reflector.

Among them, the double ellipsoidal reflector is molded by glass die-casting, and the reflective curved surface is processed by vacuum coating process.

Wherein, the height of the double ellipsoidal reflector is 45-54mm, the diameter at the light exit is 16-22mm, the height of the overlapping part is 26-29mm, and the width of the overlapping part is 14-17mm. The distance between the major axes of the ellipsoids is 28-32 mm.

Wherein, the height of the double ellipsoidal reflector is 50mm, the diameter at the light exit port is 18mm, the height of the overlapping portion is 28mm, and the width of the overlapping portion is 15.56mm, between the major axes of the two ellipsoids The distance is 30mm.

The minor axis length of each ellipsoid along the minor axis direction of the ellipsoid is 80%-90% of the minor axis length of the complete ellipsoid when the truncated part is assumed to be included.

The light emitted from the double ellipsoidal reflector forms a luminous angle of 17°-19°.

The present invention also proposes an LED lighting device, comprising the following components:

Two LED light sources,

Two primary light-gathering elements, respectively located at the front ends of the two LED light sources, are used to converge the light emitted by the two LED light sources into luminescence less than 10 degrees;

In the aforementioned double ellipsoidal reflector, two LED light sources and two primary light-gathering elements are respectively placed on each double ellipsoidal reflector at a position away from the first focal point of the light exit port.

Wherein, it also includes a light shaping mechanism, the light shaping mechanism includes at least one lens, and the light shaping mechanism is located at the second focal point of the double ellipsoidal reflector, and is used to further shape the light emitted from the double ellipsoidal reflector to have Light at the desired angle and intensity.

Wherein, the primary light concentrating element includes an optical lens or a reflector with a beam angle of 4°-7°.

Wherein, the primary concentrating element includes an optical lens or a reflector with a beam angle of 5 degrees.

Wherein, the light shaping mechanism is two convex lenses placed side by side in sequence, one of which has a focal length of 128-139 mm, and the other has a focal length of 50-60 mm.

Wherein, the two convex lenses placed side by side are in contact with each other, one of them has a focal length of 135 mm, and the other has a focal length of 50 mm.

The present invention further proposes an LED lighting device, comprising two groups of the foregoing LED lighting devices, and the distance between the two groups of LED lighting devices is at least 5 mm.

The present invention also proposes a lamp, comprising the above-mentioned LED lighting device and a housing outside the LED lighting device, the housing includes solid sides and bottom, and a transparent and pressure-resistant front part.

The optical structure of this application supports the replacement of the previous 250W light source energy consumption with less than 14W, which can save energy by more than 90%. Based on the more than 30,000 lamps in the Capital Airport, the annual energy saving can exceed 6.75 million watts, and the daily energy saving can exceed 50,000 kWh.

The theoretical service life of the LED light source is 50,000 hours, based on 8 hours of daily use, it can theoretically be used for 17 years without maintenance and replacement. Therefore, the use of LED light sources to manufacture runway navigation lights can greatly reduce the damage rate of lamps, thereby greatly reducing the difficulty and workload of maintenance work, which is conducive to aviation safety.

Description of drawings

For a better understanding of the various examples of embodiments of the invention, reference will now be made, by way of example only, to the accompanying drawings in which:

Figure 1 shows a diagram of the intensity and distribution of light for currently required runway lights.

Fig. 2 schematically shows a front view of a double ellipsoidal reflector according to a preferred embodiment of the present invention.

Fig. 3 schematically shows the A-A sectional view of the double ellipsoidal reflector according to the preferred embodiment of the present invention.

Fig. 4 schematically shows a top view of a double ellipsoidal reflector according to a preferred embodiment of the present invention.

Fig. 5 schematically shows a B-B sectional view of a double ellipsoidal reflector according to a preferred embodiment of the present invention.

Fig. 6 schematically shows a top view of an LED lighting device according to a preferred embodiment of the present invention.

Fig. 7 schematically shows a side view of an LED lighting device according to a preferred embodiment of the present invention.

Fig. 8 schematically shows a front view of an LED lighting device according to a preferred embodiment of the present invention.

Fig. 9 schematically shows a cross-sectional view of an LED lighting device according to a preferred embodiment of the present invention.

Fig. 10 schematically shows the arrangement of two double ellipsoidal reflectors according to a preferred embodiment of the present invention.

Fig. 11 schematically shows the light path diagram of the LED lighting device according to the preferred embodiment of the present invention.

Fig. 12 schematically shows the light path diagram of the combined light of the LED lighting device according to the preferred embodiment of the present invention.

detailed description

The double ellipsoidal reflector and the LED lighting device of the present invention are also mainly used in lighting systems embedded in the ground for ground lighting. At present, the large-area ground lighting of the square can only illuminate the ground by using the lamps protruding above the ground to illuminate downward or obliquely. However, the lamps protruding above the ground have certain requirements for the crowd gathering and aesthetic requirements of the square. damage. The invention provides a manufacturing scheme of a lamp embedded in the ground protruding 20 mm from the ground. The lamp can project light close to the ground with a narrow angle of about 5 meters and a wide angle of about 2 meters, and illuminate the ground through which the light passes. In this way, the application requirements of no protrusions on the ground of the square construction can be met.

The optical requirements of runway navigation lights currently used are shown in Figure 1. The average light intensity value of the 11° main beam angle is not less than 10000cd, the minimum light intensity of the 11° iso-intensity curve is not less than 5000cd, and the light field angle of 15° The light intensity of the iso-intensity curve is not less than 1000cd, and the light intensity of the iso-intensity curve of the 18° extension angle is not less than 500cd. The light projection is at an upward angle of 5°.

Calculate according to the formula x ² /a ² +y ² /b ² =1 according to the curve:

A 5.5 7.5 9 B 4.5 6 8.5

A preferred embodiment of the double ellipsoid reflector of the present invention is shown in Figures 2-5. Wherein the double ellipsoidal reflector 1 adopts a dual light source module, that is, each module uses two LED light sources, and a first-level lens can be added to each LED light source, and the first-level lens will be detailed in the following embodiments. stated. Around each LED light source, a part of the double ellipsoidal reflector is arranged, and for two LED light sources, a complete double ellipsoidal reflector is arranged. Because the two light sources are arranged close to each other to reduce the volume of the optical structure, the double ellipsoid reflector is not two complete ellipsoids, but two semi-ellipsoids with most of the ellipsoid, according to In the directions shown, the upper, lower and left (right) sides of the ellipsoid are truncated, respectively, where the upper and lower sides are truncated along a plane parallel to the minor axis of the ellipse and containing the focal point. The two semi-ellipsoids are overlapped at the separated left (right) sides opposite to each other, that is, there is a partial overlap in the middle of the ellipsoids to reduce the volume. In the double ellipsoidal reflector, two reflectors can be combined to form an integral reflective module. Overlapping locations are also referred to as overlaps.

The specific calculation formula of each ellipsoid in the double ellipsoid reflector is p=2b2/a, h2=a2-b2, where p represents the path, that is, the height of the section of the axis line, a represents the semi-major axis, and b represents Semi-minor axis, h represents the distance between the two foci of the ellipsoid, that is, the focal length. In the present invention, the distance h between the first focal point (f1) and the second focal point (f2) is 45-54mm, preferably 47mm, more preferably 49mm, more preferably 51, 52 or 53mm, most preferably 50mm, light The diameter d1 at the outlet is 16-22mm, preferably 17mm, more preferably 21, 20, 19mm, most preferably 18mm.

Although the two ellipsoids work independently without overlapping is the best state, but the non-overlapping scheme will cause the problem that the two ellipsoids occupy too much space, so the overlapping position must still be set between the two ellipsoid emitters Occupied by compressing the space, the overlapping position is also called the overlapping portion, and the overlapping portion is set so that the light emitted from one ellipsoidal illuminator will not enter the other ellipsoidal illuminator through the overlapping portion as much as possible, so as to realize A matter of balancing compressed volume with reducing interference with light in another ellipsoid. Due to the limitation of the volume of the lamp, it is not easy to make the lateral size of the double ellipsoids juxtaposed too large, so the two ellipsoids need to overlap to a certain extent, and the two ellipsoids and each optical structure represented by each, including the condenser lens and the shaping lens, are independent optical systems. If the two ellipsoids overlap too much, there will be mutual light interference, and the reflection surface of the overlapping hollow part will be lost, resulting in light loss. In order to allow light to pass through and not interfere with light, each ellipsoid can be considered to be truncated to form an overlapping part, and the width of each ellipsoid along the short axis of the ellipsoid is about 80%-90%, preferably 82%-88%, more preferably 85%-86% of the complete ellipsoid width when the portion is cut off. With this arrangement of the present invention, under the premise of the maximum compressed volume, the light entering the other ellipsoid is made as little as possible, even if this very small amount of light enters the other ellipsoid, it will not give the other ellipsoid Influenced by the outgoing light.

In this embodiment, the opening length h2 of the overlap of the two ellipsoids is 26-29 mm, preferably 28 mm, and the opening width r1 of the overlap is 14-17 mm, preferably 15 mm, most preferably 15.56 mm. The width w2 of the double ellipsoid reflector is 62-66mm, preferably 63-65mm, most preferably 64.5mm, and the distance w1 between the major axes of the two ellipsoids is 28-32mm, preferably 29-31mm, most preferably is 30mm. The LED light source is placed at the first focal point of the ellipsoid. The light outlet is set as the second focal point. Wherein, when the focal length is 50 mm and the height of the cross-section of the focal axis line is 18 mm, the light intensity of the 11° main beam angle of the obtained LED light source can reach 10000 cd.

So far, the optical structure principle of the double ellipsoidal reflector is as follows: the light from the LED light source is concentrated and projected to the light outlet once, while the scattered overflow light that has not been gathered and the light that has been gathered but projected outside the narrow light outlet are passed through the double ellipsoid. The collection and reflection of the ball reflector converges to the light outlet, which is the second focal point. With two light gatherings, the light from the LED light source is gathered to the light outlet to the maximum extent.

The double ellipsoid reflector of the present invention can be molded by glass die-casting, and the reflective curved surface is processed by a vacuum coating process to ensure that mass production can achieve the highest reflectivity and curved surface maintenance.

An LED lighting device can be formed by using the above double ellipsoidal reflectors, so as to realize low-power and high-brightness ground lighting.

An LED lighting device of a preferred embodiment of the present invention is shown in Figures 6-9. The LED light emitting device includes a light source 2 , a primary light concentrating element 3 , a double ellipsoidal reflector 1 and a light shaping mechanism 4 .

In the LED lighting device of the present invention, two LED light sources are used for each double ellipsoidal reflector, and each LED light source can be a single LED or a group of multiple LEDs. In this application, for example, four low-power multi-chip chip-integrated point-emitting LEDs can be used as a single LED light source. At present, CREE's MXL 4-chip LED light source is widely used. The full load of each chip is 3W, the theoretical total load is 12W, and the manufacturer's nominal power is 10W. In this embodiment, only less than 7W can be used to meet the requirements of long-term application. With the development of LED technology, other chips with better performance can also be used in this optical structure in the future.

In the LED light-emitting device of the preferred embodiment of the present invention, the primary concentrating element 3 adopts an optical lens or a reflector with a beam angle of about 5 degrees, such as a reflective cup, to concentrate and project the light emitted by the light source. Of course, the beam angle can of course also be realized as 4 degrees, 7 degrees or 9 degrees. A special lens or reflector for the light source that matches the LED light source can be used, the essence of which is to collect and gather the light emitted by the LED light source. The light emitted from the LED light source is generally about 120° of light emission, of course, it can also be light emission at other angles , depending on the light source. Project the light-emitting subject to the final lens, which is the glow port.

The LED light source and the primary concentrating element are placed in the double ellipsoidal reflector, which may be the reflector as described in the above embodiment, and the LED light source is placed at the first focal point of the ellipsoid.

At the light outlet of each LED light source, that is, the two second focus positions of the double ellipsoidal reflector are respectively equipped with a light shaping mechanism 4. The light shaping mechanism can include a focal length of 128-139mm, preferably 131mm, 132mm, 133mm, 134mm, 136mm, 137mm, most preferably 135mm convex lens and a convex lens with a focal length of 50-60mm, these two convex lenses are juxtaposed and the spacing is as small as possible, the spacing can be 0, that is, they are in contact with each other. The light collected for the first time by the primary light-condensing element and the second time by the double ellipsoidal reflector is projected out of the optical device through the above two convex lenses, and integrated into the required projection angle and light intensity requirements. light distribution. The reason for using two convex lenses is that the central light intensity in the 11° main spot required by the runway lights is high, so a 50-60mm convex lens approaching the focal length of the double ellipsoid is used to increase the central light intensity of the spot; at the same time, due to the lack of short focal length lenses In order to form the required projection angle width, for example, a 135mm long focal length convex lens with a distance shorter than the focal length is selected to enlarge the projection spot to form the required projection angle width.

Two light sources are used to carry out primary light concentrating, secondary light concentrating and convex lens shaping and concentrating the light into two independent light paths to project the optical structure. During the journey, the two light paths overlap into one light. The coincidence degree can reach more than 95% after 3 meters. For the convenience of manufacture and production, the structures of the above light-emitting devices can be combined into one and designed as an optical module, which can also be called a double ellipsoid module. And in mass production, the module is an optical component for luminaire manufacture.

So far, the principle of this optical structure is: the light emitted by the LED light source is concentrated and projected to the light outlet once, while the scattered overflow light that is not concentrated and the light that is concentrated but projected outside the narrow light outlet are collected and reflected by the elliptical reflector cup Converge to the light outlet, which is the second focal point. With two light gatherings, the light from the LED light source is gathered to the light outlet to the maximum extent. Then the projected spot is modulated to the required light intensity and angle by two convex lenses.

As shown in FIG. 11 , the light path diagram of an LED lighting device according to a preferred embodiment of the present invention. The left picture is a side sectional view, and the right picture is a front sectional view. It can be seen that the light emitted from the light source 2 and diffused from the primary light-gathering element 3 is reflected by the ellipsoidal reflective surface of the ellipsoid, and is modulated by the convex lens 4 at the exit of the ellipsoid, and the modulated light The angle formed is approximately 18°. Although the light that spills into the overlapping part is shown in the figure, it is very small and hardly affects the light inside the other ellipsoid. Thus, the components of the LED lighting device formed from the double ellipsoidal reflector can realize full use of the light emitted by the light source.

The light emitted by the LED light source reflected and synthesized by the double ellipsoidal reflector has undergone the above three optical treatments, and the projected light after the three optical treatments can meet the requirements of international standards in terms of light intensity, luminous angle and distribution. If the requirement of luminous intensity cannot be met due to the reduction of the luminous flux of the light source or the reduction of the filtered luminous flux due to the projection of colored light, the lamp can use an LED lighting device composed of two or more double ellipsoid modules, as shown in Figure 10, two Groups of LED lighting devices are separated by 6mm, and the light emitted constitutes 4 light paths, and the light synthesized by the 4 light paths can meet the light intensity requirements of international standards. As shown in Figure 12, from the optical path of the combined light emitted by the two sets of double ellipsoidal reflectors shown in Figure 10, it can be clearly seen that the light emitted by the LED lighting device forms a luminescence of about 17°-19°, A luminance of 18° is preferred in order to satisfy the required floor lighting.

A lamp according to a preferred embodiment of the present invention comprises the above-mentioned LED lighting device and a housing outside the LED lighting device. The enclosure includes solid sides and bottom and a transparent and pressure-resistant front, and during use, the enclosure can be positioned below ground level to provide ground level lighting.

This double light source module can be superimposed and used, which is a flexible lamp manufacturing mode that meets economical manufacturing, long-term durability, practical application of various light intensity requirements, and future LED technology development, and is also a component of this optical structure.

The present invention can be used for runway navigation lights, runway edge lights or square underground lights. For runway navigation lights, the LED light-emitting device is placed in the lamp at an angle of 5 degrees to form the elevation angle required by the navigation lights. For applications requiring light intensity below 10000cd, a double ellipsoid module can be selected. For applications requiring high light intensity, it is preferable to use two double ellipsoid modules. For runway edge lights, the light projection is similar to that of runway lights, but the light intensity requirement is slightly lower, and a double ellipsoid module is preferably used. For the underground lights of squares with ground lighting as the purpose of lighting, the light is projected on the ground. The convex lens can be changed according to the requirements. When a narrow beam is required, a convex lens with a focal length less than 70mm is used, and the double ellipsoid module is slightly higher than the ground and placed in the lamp. When it is necessary to sweep the light at a large angle close to the ground, the cylindrical mirror is placed horizontally at the light outlet of the double ellipsoidal reflector, and placed in the lamp slightly higher than the ground.

Although an effort has been made in the foregoing description to direct attention to those features which are considered to be of particular importance to the invention, it should be understood that, whether or not they are specifically emphasized, applicants claim protection for the above mentioned and/or any patentable feature or combination of features illustrated in the drawings.

Claims (14)

1. A kind of 1. double ellipsoid reflectors, it is characterised in that including the reflector main body by two ellipsoid portions, described two ellipsoid portions Shape it is essentially identical, the both ends along major axis in each ellipsoid portion are cut from the plane parallel to ellipse short shaft and comprising focus Remove, wherein one end where the first focus is closing, to accommodate for luminous element, one end where the second focus is Sky, optical emission exit is formed, so as to which light passes through and projected from it, two ellipsoid portions are also divided in a part for the ellipsoid along major axis Not Jie Chu and remaining ellipsoid contacted with each other along edge to form overlap, the overlap is hollow, wherein each The 80%- of complete ellipsoid minor axis length when minor axis length of the ellipsoid portion along ellipsoid short-axis direction is assumes to include being truncated part 90%；

   The inner surface of double ellipsoid reflectors is ellipsoid reflective surface, and the light sent so as to reflection source is simultaneously collected to light outgoing Mouthful；

   Wherein, the projection light as light beam main body from the first focal point is projected directly at optical emission exit, from the first focus The remaining diverging light at place will be reflected by the inner surface of each ellipsoid, be projected from the second focal point.
2. 2. double ellipsoid reflectors according to claim 1, it is characterised in that by the way that double ellipsoid reflectors are embodied as Along the plane of two ellipsoid axial lines be divided into it is holosymmetric up and down two part, each of which part be all it is integrally formed, by This by being assembled into a complete double ellipsoid reflectors relative to one another by two parts.
3. 3. double ellipsoid reflectors according to claim 1, it is characterised in that double ellipsoid reflectors are cast into using glass Type, reflective surface are handled with technique for vacuum coating.
4. 4. double ellipsoid reflectors according to claim 1, it is characterised in that the height of double ellipsoid reflectors is 45- 54mm, the latus rectum at optical emission exit are 16-22mm, and the height of overlap is 26-29mm, and the width of overlap is 14-17mm, two The distance between major axis of individual ellipsoid is 28-32mm.
5. 5. double ellipsoid reflectors according to claim 1, it is characterised in that the height of double ellipsoid reflectors is 50mm, the footpath at thang-kng exit portal are 18mm, and the height of overlap is 28mm, and the width of overlap is 15.56mm, two ellipsoids The distance between major axis be 30mm.
6. 6. double ellipsoid reflectors according to claim 1, it is characterised in that the light shape sent from this pair of ellipsoid reflector Into 17 ° -19 ° of lighting angle.
7. 7. a kind of LED light emission device, it is characterised in that including with lower component：

   Two LED light sources,

   Two collective opticses, respectively positioned at the front end of two LED light sources, for the light difference for sending two LED light sources Converge to be luminous less than 10 degree；

   Double ellipsoid reflectors as any one of claim 1-6, wherein by two LED light sources and two optically focused members Part is respectively placed in the position of the first focus of the remote optical emission exit of each double ellipsoid reflectors.
8. 8. according to the LED light emission device described in claim 7, it is characterised in that also including light shaping mechanism, the light shaping mechanism Including at least one lens, the light shaping mechanism is located at the second focal point of double ellipsoid reflectors, for will be reflective from double ellipsoids The light that device is sent further is shaped as the light for having angle and light intensity in need.
9. 9. according to the LED light emission device described in claim 7, it is characterised in that it is 4 degree of -7 degree that a collective optics, which includes beam angle, Optical lens or reflector.
10. 10. LED light emission device according to claim 7, it is characterised in that it is 5 degree that a collective optics, which includes beam angle, Optical lens or reflector.
11. 11. LED light emission device according to claim 8, it is characterised in that light shaping mechanism is two placed side by side successively Individual convex lens, the focal length of one of convex lens is 128-139mm, and the focal length of another convex lens is 50-60mm.
12. 12. LED light emission device according to claim 11, it is characterised in that two convex lens placing side by side are It is in contact with each other, the focal length of one of convex lens is 135mm, and the focal length of another convex lens is 50mm.
13. 13. a kind of LED light emission device, including at least two groups of LED light emission devices as any one of claim 7-12, its In between at least two groups of LED light emission devices at intervals of at least 5mm.
14. 14. a kind of light fixture, including LED light emission device as any one of claim 7-13 and positioned at the luminous dresses of LED The shell of outside is put, the shell includes firm sidepiece and bottom and transparent and pressure-resistant front portion.