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CN114370623B - LED light distribution device and LED lamp for replacing halogen vehicle lamp bulb - Google Patents

LED light distribution device and LED lamp for replacing halogen vehicle lamp bulb Download PDF

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Publication number
CN114370623B
CN114370623B CN202011097817.7A CN202011097817A CN114370623B CN 114370623 B CN114370623 B CN 114370623B CN 202011097817 A CN202011097817 A CN 202011097817A CN 114370623 B CN114370623 B CN 114370623B
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Prior art keywords
curved surface
light
bus
reflecting
led
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CN114370623A (en
Inventor
蔡卫撑
俞福斌
苏宙平
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ZHEJIANG TIANCHONG VEHICLE LAMP GROUP
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ZHEJIANG TIANCHONG VEHICLE LAMP GROUP
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Publication of CN114370623A publication Critical patent/CN114370623A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • F21V7/04—Optical design
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F21W2102/10—Arrangement or contour of the emitted light
    • F21W2102/13—Arrangement or contour of the emitted light for high-beam region or low-beam region
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

本发明涉及对LED光源进行配光的技术领域。本发明的一种LED配光装置及用于替代卤素车灯灯泡的LED灯，包括光线入射端、中间导光体、光线出射端；光线入射端配置有第一折射曲面、第二折射曲面、第一反射曲面，光线出射端配置有第二反射曲面、垂直透光曲面。从LED光源出射的光线，小角度区域直接经过第一折射曲面折射后照射到第二反射曲面经过反射后平行出射；大角度区域光线经过第二折射曲面折射后入射到了第一反射曲面，经过第一反射曲面反射后，在中间导光体中传输一段距离后，照射到第二反射曲面上，经过第二反射曲面反射后平行出射。LED光源经过LED装置配光之后，与卤素灯丝产生了完全相同的光强分布，因此可以替换卤素车大灯中的灯丝。

The present invention relates to the technical field of light distribution for LED light sources. An LED light distribution device and an LED lamp for replacing a halogen headlight bulb of the present invention comprise a light incident end, an intermediate light guide, and a light exit end; the light incident end is provided with a first refractive curved surface, a second refractive curved surface, and a first reflective curved surface, and the light exit end is provided with a second reflective curved surface and a vertical light-transmitting curved surface. Light emitted from the LED light source is refracted directly by the first refractive curved surface in a small-angle area, irradiated to the second reflective curved surface after reflection, and then emitted in parallel; light in a large-angle area is refracted by the second refractive curved surface, irradiated to the first reflective curved surface, and after reflection by the first reflective curved surface, it is transmitted for a distance in the intermediate light guide, irradiated to the second reflective curved surface, and then emitted in parallel after reflection by the second reflective curved surface. After the LED light source is light-distributed by the LED device, it produces a light intensity distribution that is exactly the same as that of a halogen filament, so it can replace the filament in a halogen headlight.

Description

LED light distribution device and LED lamp for replacing halogen car lamp bulb
Technical Field
The invention belongs to the technical field of illumination, relates to a technology for carrying out light distribution on an LED light source, and in particular relates to an LED light distribution device and an LED lamp for replacing a halogen car lamp bulb.
Background
The LED is widely applied to lighting of car lamps, in particular to car headlamps due to the advantages of energy conservation, environmental protection, long service life and the like.
However, a large number of lamps still use halogen lamps, wherein the halogen lamp is usually formed by putting a halogen filament at the focus of a reflector, and then performing light distribution through the reflector to generate a specified illuminance distribution.
In order to meet the vehicle owner's demand of replacing halogen lamps with LED vehicle lamps, various large lighting enterprises push out LED light sources for replacing halogen lamps, most of the light sources are manufactured by arranging a plurality of LED chips on the side face of a polygon prism, however, the size of the LED light sources manufactured by the method is far larger than that of a halogen filament, so that a single light source is placed at a focus, and the generated light shape distribution and the halogen filament are far different after being reflected by an original reflector.
In addition, the LED light source has great light distribution difference with a halogen lamp, and the LED light source is used for directly replacing a halogen filament in the halogen car headlight, so that the automobile lighting regulation cannot be met.
In addition, the LED light source has the advantages that the LED chips are not easy to dissipate heat due to the fact that the LED light source is large in size and the LED chips are distributed, so that the service life of the LED light source is short, and an additional heat dissipation device can be added to assist the LED chips in dissipating heat, but the cost of the car lamp is increased.
Based on the above-mentioned current situation, how to arrange the LED light source so that the LED light source is close to the halogen bulb in size, the light distribution requirement is basically the same, and the problem that the field is expected to solve can be better dissipated.
Disclosure of Invention
The invention aims to solve the problem that the existing LED is replaced by a halogen lamp, and firstly provides an LED light distribution device, an LED light source is formed after an LED chip is subjected to light distribution by the LED device, the volume of the LED light source is similar to that of the halogen lamp, and the light distribution requirements of the LED light source and the halogen lamp are basically the same.
Accordingly, the invention further provides an LED lamp for replacing the halogen car lamp bulb, which is formed by combining an LED chip and the LED light distribution device.
The technical scheme adopted by the invention is as follows:
The LED light distribution device is a rotary body structure formed by rotating a closed plane graph with one straight line side as an axis, and sequentially comprises a light incidence end, a middle light guide body and a light emergent end from back to front along the direction of a rotation axis, wherein the light incidence end is provided with a first refractive curved surface, a second refractive curved surface and a first reflective curved surface, and the light emergent end is provided with a second reflective curved surface and a vertical light transmission curved surface.
The closed plane graph is formed by sequentially connecting and enclosing a straight line edge serving as a rotating shaft, a first refraction curved surface bus, a second refraction curved surface bus, a first reflection curved surface bus, a side surface bus of the middle light guide body, a vertical light transmission curved surface bus and a second reflection curved surface bus end to end.
The front end of the second refraction curved surface bus is connected with the front end of the first refraction curved surface, the rear end of the second refraction curved surface bus is connected with the rear end of the first refraction curved surface bus, the front end of the first refraction curved surface bus is connected with the rear end of the side surface bus of the middle light guide body, the front end of the side surface bus of the middle light guide body is connected with the rear end of the vertical light transmission curved surface bus, the front end of the vertical light transmission curved surface bus is connected with the front end of the second reverse curved surface bus, and the rear end of the second refraction curved surface bus is connected with the front end of the straight line edge serving as a rotation shaft.
The light source luminous point is arranged on the rotary shaft center and is positioned behind the first refraction curved surface, the rear end of the second refraction curved surface generatrix is positioned in front of the projection point on the rotary shaft center, the light rays emitted from the light source luminous point to the first refraction curved surface are refracted by the first refraction curved surface and are emitted to a virtual focus in front of the second refraction curved surface on the rotary shaft center, and the light rays emitted from the light source luminous point to the second refraction curved surface are emitted to the virtual focus after being reflected by the first refraction curved surface.
The second reflecting curved surface is positioned on the path that the light rays refracted by the first reflecting curved surface and reflected by the first reflecting curved surface are directed to the virtual focus, and the light rays refracted by the first reflecting curved surface and reflected by the first reflecting curved surface are reflected by the second reflecting curved surface and then are emitted to the side surface through the vertical light transmission curved surface.
In the present invention, the direction of the light incident end of the LED light distribution device is taken as the rear, the direction of the light emitting end is taken as the front, and the end of the projection of the two ends of each side forming the closed plane figure, which is positioned near the front on the rotation axis, is taken as the front, and the other end is taken as the rear.
The LED light distribution device collects light rays emitted from a light-emitting point at the rear end of the device to the front end of the device through reflection and refraction respectively, and then the light rays are uniformly emitted to the side face through reflection of a near-conical reflection curved surface at the front end. On the one hand, the LED light distribution device is adopted, the LED chip is arranged at a rear position, the LED chip is close to the interface, and heat of the LED chip can be directly conducted to the interface, so that heat dissipation is facilitated, and other heat dissipation structures for conducting the heat from the LED chip to the interface are not required to be arranged for the LED chip.
On the other hand, the light emitted by the LED chip at 180 degrees is uniformly emitted to the side after being distributed by the LED light distribution device.
The advantages are that:
1. Compared with the prior art that LED chips are arranged on four sides of a polygon prism to simulate the halogen bulb to emit light to the periphery, the LED light distribution device provided by the invention is only required to be provided with one or a group of LED chips at the rear end, so that the structure is greatly simplified, and the size of the halogen bulb used by the existing automobile lamp is also reduced.
2. The light emitted from the center to the side is the most main component part of the light emitted by the halogen bulb in 360 degrees, and after the LED light distribution device is adopted, the LED light is simply emitted from the side, so that other light forms are avoided, and the LED light distribution device is suitable for light distribution of the existing car lamp for the halogen lamp.
3. By adopting the LED light distribution device, when all light rays are emitted forward to the second reflecting curved surface from the rear end, the light rays are converged towards the virtual focus uniformly. When the second reflecting curved surface is as close to the virtual focus as possible, the light emitted from the side surface has higher concentration degree, so that a small light emitting area like a halogen filament can be achieved, the LED light distribution device is combined by using the LED chip, the halogen bulb in the existing car lamp is replaced, the light distribution of the existing car lamp for the halogen lamp can be perfectly adapted, and the light distribution regulation of car lamp lighting regulation can be achieved.
Alternatively, the middle light guide body has a conical structure, the front port diameter is small, the rear port diameter is large, and the side generatrix of the middle light guide body is parallel to the outermost light ray which is reflected by the first reflecting curved surface on the same plane and then is emitted to the virtual focus.
Alternatively, the main body part of the middle light guide body is of a conical structure, the front end diameter of the main body part is small, the rear end diameter of the main body part is large, the side bus of the middle light guide body consists of the side bus of the conical main body part and the side bus of the connecting section, the front end of the bus of the conical main body part is connected with the rear end of the bus of the vertical light-transmitting curved surface, the front end of the bus of the connecting section is connected with the rear end of the bus of the conical main body part, and the rear end of the bus of the connecting section is connected with the front end of the bus of the first reflecting curved surface. The generatrix of the conical main body part is parallel to the outermost ray which is reflected by the first reflecting curved surface on the same plane and then is emitted to the virtual focus.
Optionally, the first reflective curved surface is a total reflective curved surface opposite to the light source light emitting point.
Optionally, the first reflecting curved surface is composed of a primary total reflecting curved surface and a secondary total reflecting curved surface, the light refracted by the second reflecting curved surface is totally emitted to the primary total reflecting curved surface of the first reflecting curved surface, reflected by the primary total reflecting curved surface of the first reflecting curved surface, emitted to the secondary total reflecting curved surface of the first reflecting curved surface, reflected by the secondary total reflecting curved surface of the first reflecting curved surface, and emitted to the virtual focus.
Optionally, the second reflecting curved surface is also composed of a primary total reflecting curved surface and a secondary total reflecting curved surface, the light rays which are reflected by the secondary total reflecting curved surface of the first reflecting curved surface and are emitted to the virtual focus are all irradiated to the primary total reflecting curved surface of the second reflecting curved surface, the light rays which are reflected by the primary total reflecting curved surface of the second reflecting curved surface and are emitted to the secondary total reflecting curved surface of the second reflecting curved surface from the vertical light transmitting curved surface to the side surface after being reflected by the secondary total reflecting curved surface of the second reflecting curved surface.
Optionally, the light is reflected by the second reflective curved surface and then emitted to the side along the direction perpendicular to the rotation axis, and the perpendicular light-transmitting curved surface generatrix is a straight line parallel to the rotation axis.
Alternatively, the light is reflected by the second reflecting curved surface and then emitted to the side surface in a fan shape, the generating line of the vertical light-transmitting curved surface is an arc line, and the circle center of the arc line is the same as the circle center of the fan shape.
The LED lamp for replacing the halogen car lamp bulb comprises an LED chip, and the LED light distribution device is arranged in front of the LED chip.
The LED light distribution device is in a rotary body structure formed by rotating one straight line side of a closed plane graph as an axis, and sequentially comprises a light incidence end, a middle light guide body and a light emergent end from back to front along the direction of a rotary axis;
The closed plane graph is formed by sequentially connecting and enclosing a straight line edge serving as a rotating shaft, a first refraction curved surface bus, a second refraction curved surface bus, a first reflection curved surface bus, a side surface bus of the middle light guide body, a vertical light transmission curved surface bus and a second reflection curved surface bus end to end;
The front end of the second refraction curved surface bus is connected with the front end of the first refraction curved surface, the rear end of the second refraction curved surface bus is connected with the rear end of the first refraction curved surface bus, the front end of the first refraction curved surface bus is connected with the rear end of the side surface bus of the middle light guide body, the front end of the side surface bus of the middle light guide body is connected with the rear end of the vertical light transmission curved surface bus, the front end of the vertical light transmission curved surface bus is connected with the front end of the second reverse curved surface bus, and the rear end of the second reflection curved surface bus is connected with the front end of the straight line edge serving as a rotation shaft;
The LED chip is arranged on the rotating shaft center and is positioned behind the first refraction curved surface, and the rear end of the bus of the second refraction curved surface is positioned in front of a projection point on the rotating shaft center;
the second reflecting curved surface is positioned on the path that the light rays refracted by the first reflecting curved surface and reflected by the first reflecting curved surface are directed to the virtual focus, and the light rays refracted by the first reflecting curved surface and reflected by the first reflecting curved surface are reflected by the second reflecting curved surface and then are emitted to the side surface through the vertical light transmission curved surface.
Further, all descriptions of the LED light distribution device are applicable to the LED light source.
The beneficial effects of the invention adopting the technical scheme are as follows:
1. The LED light distribution device is characterized in that the light emitted from the LED light source is irradiated to the second reflecting curved surface to be emitted in parallel after being reflected by the first reflecting curved surface directly in a small-angle area through the arrangement of the light incidence end, the middle light guide body and the light emitting end, the light in the large-angle area is irradiated to the first reflecting curved surface after being refracted by the second reflecting curved surface, is irradiated to the second reflecting curved surface after being transmitted for a certain distance in the middle light guide body after being reflected by the first reflecting curved surface, and is emitted in parallel after being reflected by the second reflecting curved surface.
After the LED light source is subjected to light distribution by the LED device, the LED light source and the halogen filament generate the identical light intensity distribution, so that the LED light source can replace the filament in the halogen car headlight and become the LED car headlight.
2. Compared with the prior art that LED chips are arranged on four sides of a polygon prism to simulate the halogen bulb to emit light to the periphery, the LED light distribution device provided by the invention is only required to be provided with one or a group of LED chips at the rear end, so that the structure is greatly simplified, and the size of the halogen bulb used by the existing automobile lamp is also reduced.
3. The LED light distribution device is characterized in that the LED chip is arranged at a rear position, the LED chip is close to the interface, and heat of the LED chip can be directly conducted to the interface to facilitate heat dissipation, so that other heat dissipation structures for conducting the heat from the LED chip to the interface are not required to be arranged on the LED chip.
Drawings
Fig. 1 is a schematic view of the optical path principle of the LED light distribution device and the LED chip assembly in embodiment 1 of the present invention;
FIG. 2 is an enlarged view of portion a of FIG. 1;
Fig. 3 and fig. 4 are schematic diagrams of a calculation and derivation process of the free-form surface B-M in embodiment 1 of the present invention;
FIG. 5 is a schematic diagram of the calculation and derivation of the free-form surface A-C in example 1 according to the present invention;
FIG. 6 is a schematic view of the light path principle of the LED light distribution device and the LED chip in the embodiment 2;
fig. 7 is an enlarged view of the portion b in fig. 6.
The reference numerals are a light incidence end 1, a middle light guide body 2, a light emergence end 3 and a rotary shaft center 4.
Detailed Description
In order that the above-recited objects, features and advantages of the present application will be more clearly understood, a more particular description of the application will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
In the description of the present invention, the term "at least one" refers to one or more, unless explicitly defined otherwise. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The specific embodiments of the present invention are as follows:
embodiment 1 the structural features and the feasibility of the LED light distribution device of the invention are further described below with reference to the accompanying drawings.
Fig. 1 and 2 are schematic diagrams of two-dimensional light path principles of A preferred scheme of the LED light distribution device according to the present invention, and the solid structure of the LED light distribution device is obtained by rotating A half of the two-dimensional profile shown in fig. 1, that is, A plane pattern M-B-A-C-D-E-F-G by 360 degrees around A rotation axis 4 (A straight line corresponding to an OV connecting line).
The LED light distribution device sequentially comprises a light incidence end 1, a middle light guide body 2 and a light emergent end 3 from back to front along the direction of a rotation axis 4, wherein the light incidence end 1 is provided with a first refraction curved surface, a second refraction curved surface and a first reflection curved surface, and the light emergent end 3 is provided with a second reflection curved surface and a vertical light transmission curved surface.
The intermediate light guide 2 is provided with a side surface of the connecting section of the intermediate light guide 2 and a side surface of the tapered body portion of the intermediate light guide 2.
The first refractive curved surface is a curved surface formed by rotating a parabolic line MB in FIG. 1 around a rotation axis 4 by taking the parabolic line MB as a curved surface, namely a curved surface represented by B-Q in FIG. 1, the second refractive curved surface is a curved surface formed by rotating a line BA in FIG. 1 around the rotation axis 4 by taking the parabolic line BA as a curved surface represented by A-B, P-Q in FIG. 1, and the first reflective curved surface is a curved surface formed by rotating a line AC in FIG. 1 around the rotation axis 4 by taking the parabolic line AC as a curved surface represented by A-C, P-S in FIG. 1.
In fig. 1, a line segment CD is parallel to the rotation axis 4, and a curved surface formed by rotating the line segment CD around the rotation axis 4 as a bus is used as a side surface of a connecting section of the intermediate light guide 2, which is used to ensure that the profile range of the intermediate light guide 2 is larger than the range of light reflected by the first reflective curved surface, and a curved surface formed by rotating the line segment DE around the rotation axis 4 as a bus is used as a side surface of a tapered body portion of the intermediate light guide 2.
The vertical light-transmitting curved surface is a curved surface formed by rotating a line segment EF parallel to the rotation axis 4 around the rotation axis 4 by taking the line segment EF as a generatrix, namely a curved surface represented by E-F, J-K in fig. 2, the second reflecting curved surface is a curved surface formed by rotating a parabola FG around the rotation axis 4 by taking the line segment EF as a generatrix, namely a curved surface represented by F-G, G-K in fig. 2, and the light rays reflected by the second reflecting curved surface are all vertically emitted to the vertical light-transmitting curved surface.
The parabola MB, line BA, parabola AC, line CD, line DE, line EF, and parabola FG described above are connected end to end in sequence.
From the above, in the plan view shown in fig. 1 and 2, MB-BA-AC is used as the light incident end 1 of the LED light distribution device, the CDE is formed by the middle light guide body 2, the CD is a connecting part of the middle light guide body 2, the DE is a conical light transmitting part of the middle light guide body 2, and the EFG is used as the light emitting end 3 of the LED light distribution device.
When the LED chip is applied, the LED chip is placed at the O point, the O point is positioned on the right side of the AP plane, namely, the LED chip is placed in the area between the AB surface and the BQ surface and is positioned on the rotation axis 4.
The LED light source is a typical lambertian light source, and the emergent light of the LED light source is divided into two parts according to the emergent angle and is respectively a small-angle area and a large-angle area, specifically, the area surrounded by OB, OQ and BQ in fig. 1 is the small-angle area, the area surrounded by OB, OA or OQ and OP in the fig. 1 is the large-angle area, and the large-angle boundary and the small-angle boundary are OB or OQ. The included angle between the OB and the rotation axis 4 is preferably 41 degrees, when the included angle between the emergent ray and the rotation axis 4 is smaller than 41 degrees, the emergent ray enters a small-angle area, and when the included angle between the emergent ray and the rotation axis 4 is larger than 41 degrees, the emergent ray enters a large-angle area.
The light rays in the small-angle area are refracted through the first refraction curved surface B-Q and then are incident on the second reflection curved surface F-G, the refracted light rays are reflected through the second reflection curved surface F-G and then are emitted out of the LED light distribution device in parallel, and the extension lines of the light rays refracted through the first refraction curved surface B-Q are converged at a V point (virtual focus). Light rays in a large-angle area are refracted through the second refraction curved surface A-B and then reflected through the first reflection curved surface A-C, the reflected light rays are reflected through the second reflection curved surface F-G and then are emitted out of the LED light distribution device in parallel, and the extended lines of the light rays reflected through the first reflection curved surface A-C are converged at a V point (virtual focus).
The following explains the traveling paths of the light rays OHRI and OLXWU in fig. 1 and 2, respectively.
1. Light OHRI, namely emergent light of the LED light source is emitted from the point O, the emergent light OH is refracted through the first refraction curved surface B-Q in a small angle area to form light HR, the light HR is incident on the second reflection curved surface F-G and is reflected through the second reflection curved surface F-G to form light RI, and the light RI is vertically incident on the vertical transmission curved surface E-F and is emitted out of the LED light distribution device as parallel light.
2. Light OLXWU, namely emitting the emergent light of the LED light source from the point O, refracting the emergent light OL through the second refraction curved surface A-B in a large-angle area to form light LX, reflecting the light LX through the first reflection curved surface A-C to form light XW, reflecting the light XW through the second reflection curved surface F-G to form light WU, vertically incident the light WU on the vertical transmission curved surface E-F, and emitting the light through the LED light distribution device in parallel.
In the following, taking the light OBR ' I ' and the light OL ' CW ' U ' in fig. 1 and 2 as examples, the critical light of the small-angle area and the large-angle area and the travel path of the outermost light incident through the large-angle area and reflected by the first reflective curved surface and directed to the V point (virtual focus) are respectively explained.
1. The emergent light of the LED light source is emitted from the point O, the emergent light OB is refracted through the first refraction curved surface B-Q in a small angle area to form light BR ', the light BR ' is a critical light in the small angle area and the large angle area, the light BR ' is incident on the second reflection curved surface F-G, the light is reflected through the second reflection curved surface F-G to form light R ' I ', and the light R ' I ' is vertically incident on the vertical light transmission curved surface E-F and is emitted out of the LED light distribution device in parallel.
2. The emergent light of the LED light source is emitted from the point O, the emergent light OL ' is refracted through the second refraction curved surface A-B in a large-angle area to form light L ' C, the light L ' C is reflected through the first reflection curved surface A-C to form light CW ' parallel to the line segment DE, the light CW ' is the outermost light, the light W ' U ' is formed after being reflected through the second reflection curved surface F-G, and the light W ' U ' is vertically incident on the vertical transmission curved surface E-F and is emitted out of the LED light distribution device in parallel.
As shown in fig. 3-5, the first refractive curved surface B-Q is a free curved surface (or a higher order aspheric surface), and the surface shape is obtained through calculation, so that the extension line of the light emitted from the LED passes through the B-Q surface and then intersects with the V point. The first reflecting curved surface A-C is a free curved surface (or a higher-order aspheric surface), the surface shape is obtained through calculation, and it is ensured that an extension line of the light emitted from the LED is intersected with a V point after the light is reflected by the A-C surface. The light rays are refracted through the second refraction curved surface A-B, are incident to the A-C surface, and all the light rays incident to the A-C surface meet the total reflection condition. The second reflective surface F-G is a paraboloid, and V is the focal point of the paraboloid. The O-point and the V-point are object-image relationships and are a pair of conjugate points.
When the LED light distribution device is designed, the position of an LED light source, the size of a demarcation angle (the demarcation angle is between 30 and 60 degrees) and the positions of a point B and a point A in the figure are required to be determined, and when the initial conditions are selected, the refraction light passing through the second refraction curved surface A-B is required to be ensured to be incident on the A-C surface so as to meet the total reflection conditions.
The free-form surface B-M is calculated by analyzing the light rays in the small angle area, the calculation and deduction process is shown in fig. 3 and 4, the light rays emitted from the O point are sampled at equal angles, for example, one light ray is sampled every 1 degree to be used as a sampled light ray, and the smaller the angle of the sampled light ray is, the better the angle of the sampled light ray is. Each ray is refracted by the free-form surface, and the extension line of each ray intersects with the V point. The point B is determined as an initial condition, light enters from a light source O point to the point B, the extension line after refraction is converged at the point V, a normal vector passing through the point B can be obtained according to a refraction law, so that a tangent passing through the point B can be obtained, a second sampling light emitted from the point O intersects with the tangent passing through the point B, the intersection point is the point B1, the second light is refracted through the point B1, the extension line of the refraction light is converged at the point V, the normal vector passing through the point B1 can be obtained according to the refraction law, so that a tangent passing through the point B1 intersects with a third sampling light, a point B2 (not shown) can be obtained, and all points of the B-M surface can be obtained by continuously repeating the process.
The method comprises the steps of calculating and deducing an A-C plane by analyzing light rays in a large-angle area, wherein the A-C plane is also a free curved surface, the A-C plane calculating process is shown in fig. 5, because the A point is determined as an initial condition, the light rays enter the A point from a light source O point, the extension lines converge on a V point after refraction, a normal vector passing through the A point can be obtained according to a refraction law, a tangent line passing through the A point can be obtained, a second sampling light ray emitted from the O point firstly passes through a side end face AB, the incident point is the T1 point, the intersection point of the light ray emitted from the T1 point and the tangent line passing through the A point is the A1 point, the extension line of the reflected light ray is intersected with the V point after the light ray emitted from the T2 point is reflected by the A1 point, the normal vector passing through the A1 point can be obtained, the A2 point is obtained after the third sampling light ray is refracted through the T2 point, the A2 point is obtained, and the sampling point on the whole A-C plane can be obtained continuously.
Embodiment 2 is different from embodiment 1 in that the first reflective curved surface A-C is composed of a primary total reflective curved surface A-Y and a secondary total reflective curved surface Y-C, and the light refracted by the second reflective curved surface A-B is totally emitted to the primary total reflective curved surface A-Y, reflected by the primary total reflective curved surface A-Y and emitted to the secondary total reflective curved surface Y-C, and reflected by the secondary total reflective curved surface Y-C and emitted to the V point (virtual focus), as shown in fig. 6 and 7.
The second reflecting curved surface F-G is also composed of a primary total reflecting curved surface F-Z and a secondary total reflecting curved surface Z-G, the light rays which are reflected by the secondary total reflecting curved surface Y-C of the first reflecting curved surface A-C and are emitted to the V point (virtual focus) are all irradiated onto the primary total reflecting curved surface F-Z of the second reflecting curved surface F-G, the light rays which are reflected by the primary total reflecting curved surface F-Z and are emitted to the secondary total reflecting curved surface Z-G of the second reflecting curved surface F-G are emitted from the vertical light transmitting curved surface E-F after being reflected by the secondary total reflecting curved surface Z-G.
In the following example, as shown in the figure, the light ray OL ' X ' Y ' W ' Z ' U ' is emitted from the point O, the emitted light ray OL ' is refracted by the second refraction curved surface A-B in a large angle area to form the light ray L ' X ', the light ray L ' X ' is reflected by the first reflection curved surface A-C of the first refraction curved surface A-Y to form the light ray X ' Y ', the light ray X ' Y ' is reflected by the second reflection curved surface A-C of the first refraction curved surface A-C to form the light ray Y ' W ', the light ray Y ' W ' is reflected by the first reflection curved surface F-Z of the second refraction curved surface F-G to form the light ray W ' Z ', the light ray W ' Z ' is reflected by the second reflection curved surface F-G to form the light ray Z ' U ', and the light ray Z ' U ' is vertically incident on the vertical transmission curved surface E-F and emitted in parallel light.

Claims (10)

1. The LED light distribution device is characterized by comprising a rotary body structure formed by rotating a closed plane graph by taking one straight line side as an axis, wherein the light distribution device sequentially comprises a light incidence end, a middle light guide body and a light emergent end from back to front along the direction of a rotation axis;
The closed plane graph is formed by sequentially connecting and enclosing a straight line edge serving as a rotating shaft, a first refraction curved surface bus, a second refraction curved surface bus, a first reflection curved surface bus, a side surface bus of the middle light guide body, a vertical light transmission curved surface bus and a second reflection curved surface bus end to end;
The front end of the second refraction curved surface bus is connected with the front end of the first refraction curved surface, the rear end of the second refraction curved surface bus is connected with the rear end of the first refraction curved surface bus, the front end of the first refraction curved surface bus is connected with the rear end of the side surface bus of the middle light guide body, the front end of the side surface bus of the middle light guide body is connected with the rear end of the vertical light transmission curved surface bus, the front end of the vertical light transmission curved surface bus is connected with the front end of the second reverse curved surface bus, and the rear end of the second reflection curved surface bus is connected with the front end of the straight line edge serving as a rotation shaft;
The light source luminous point is arranged on the center of the rotation shaft and is positioned behind the first refraction curved surface and in front of the projection point of the rear end of the bus of the second refraction curved surface on the center of the rotation shaft;
the second reflecting curved surface is positioned on the path that the light rays refracted by the first reflecting curved surface and reflected by the first reflecting curved surface are directed to the virtual focus, and the light rays refracted by the first reflecting curved surface and reflected by the first reflecting curved surface are reflected by the second reflecting curved surface and then are emitted to the side surface through the vertical light transmission curved surface.
2. The LED light distribution device of claim 1, wherein the middle light guide body is of a conical structure, the front port diameter is small, and the rear port diameter is large;
The side surface generatrix of the middle light guide body is parallel to the outermost light ray which is reflected by the first reflecting curved surface on the same plane and then is emitted to the virtual focus.
3. The LED light distribution device of claim 1, wherein the main body part of the middle light guide body is of a conical structure, the front end diameter of the main body part is small, the rear end diameter of the main body part is large, the side bus of the middle light guide body consists of the side bus of the conical main body part and the side bus of the connecting section, the front end of the bus of the conical main body part is connected with the rear end of the bus of the vertical light-transmitting curved surface, the front end of the bus of the connecting section is connected with the rear end of the bus of the conical main body part, and the rear end of the bus of the connecting section is connected with the front end of the bus of the first reflecting curved surface.
4. The LED light distribution device according to claim 3, wherein the generatrix of the tapered body portion is parallel to the outermost one of the light rays which are reflected by the first reflective curved surface on the same plane and directed to the virtual focus.
5. The LED light distribution device according to claim 1, wherein the first reflecting curved surface is a total reflecting curved surface corresponding to a light emitting point of the light source.
6. The LED light distribution device of claim 1, wherein the first reflecting curved surface is composed of a primary total reflection curved surface and a secondary total reflection curved surface, and light rays refracted by the second reflecting curved surface are all emitted to the primary total reflection curved surface of the first reflecting curved surface, reflected by the primary total reflection curved surface of the first reflecting curved surface, emitted to the secondary total reflection curved surface of the first reflecting curved surface, reflected by the secondary total reflection curved surface of the first reflecting curved surface, and emitted to the virtual focus.
7. The LED light distribution device of claim 1, wherein the second reflecting curved surface is composed of a primary total reflection curved surface and a secondary total reflection curved surface, light rays which are reflected by the secondary total reflection curved surface of the first reflecting curved surface and are directed to the virtual focus are all irradiated on the primary total reflection curved surface of the second reflecting curved surface, reflected by the primary total reflection curved surface of the second reflecting curved surface and are directed to the secondary total reflection curved surface of the second reflecting curved surface, reflected by the secondary total reflection curved surface of the second reflecting curved surface and are directed to the side surface from the vertical light transmission curved surface.
8. The LED light distribution device according to claim 1, wherein the light is reflected by the second reflecting curved surface and then emitted to the side along the direction perpendicular to the rotation axis, and the perpendicular light-transmitting curved surface generatrix is a straight line parallel to the rotation axis.
9. The LED light distribution device of claim 1, wherein the light rays are reflected by the second reflecting curved surface and then emitted to the side face in a fan shape, the vertical light-transmitting curved surface generatrix is an arc line, and the circle center of the arc line is the same as the circle center of the fan shape.
10. An LED lamp for replacing a halogen car lamp bulb is characterized by being formed by combining an LED chip and the LED light distribution device according to any one of claims 1-9.
CN202011097817.7A 2020-10-14 2020-10-14 LED light distribution device and LED lamp for replacing halogen vehicle lamp bulb Active CN114370623B (en)

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