CN114370623A

CN114370623A - LED light distribution device and LED lamp for replacing halogen car lamp bulb

Info

Publication number: CN114370623A
Application number: CN202011097817.7A
Authority: CN
Inventors: 蔡卫撑; 俞福斌; 苏宙平
Original assignee: Taizhou Yuanda Industrial Design Co ltd
Current assignee: Taizhou Yuanda Industrial Design Co ltd
Priority date: 2020-10-14
Filing date: 2020-10-14
Publication date: 2022-04-19

Abstract

The invention relates to the technical field of light distribution of an LED light source. The invention relates to an LED light distribution device and an LED lamp for replacing a halogen car lamp bulb, which comprise a light ray incidence end, a middle light guide body and a light ray emergence end; the light incident end is provided with a first refraction curved surface, a second refraction curved surface and a first reflection curved surface, and the light emergent end is provided with a second reflection curved surface and a vertical light-transmitting curved surface. The light rays emitted from the LED light source are directly reflected by the first refraction curved surface in a small-angle area, then irradiate the second reflection curved surface, and are emitted in parallel after being reflected; the light rays in the large-angle area are refracted by the second refraction curved surface and then enter the first reflection curved surface, are reflected by the first reflection curved surface, are transmitted for a distance in the middle light guide body, irradiate the second reflection curved surface, and are reflected by the second reflection curved surface and then exit in parallel. After the LED light source is subjected to light distribution by the LED device, the light distribution is completely the same as that of the halogen lamp filament, so that the lamp filament in the halogen car headlamp can be replaced.

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 distributing light of an LED light source, and particularly 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 the lighting of the car lamp due to the advantages of energy conservation, environmental protection, long service life and the like, and is particularly applied to the car headlamp.

However, halogen lamps are still used in a large number of vehicle lamps, wherein the halogen lamps usually place a halogen filament at the focus of a reflector first, and then generate a specified illuminance distribution after light distribution by the reflector; when the halogen filament needs to be replaced by the LED, the original reflector is not replaced, so that the replaced LED lamp still depends on the reflector for light distribution.

In order to meet the vehicle owner's requirement of replacing a halogen lamp with an LED vehicle lamp, various large lighting enterprises put forward LED light sources for replacing the halogen lamp, most of the light sources are made by arranging a plurality of LED chips on the lateral surface of a polygonal column, however, the size of the LED light source made by the method is far larger than that of a halogen filament, so that a light source is placed on a focus, and the generated light shape distribution has a large difference with the halogen filament after being reflected by an original reflector.

In addition, the LED light source has a great light distribution difference with halogen lamps, and the halogen lamp filaments in the halogen car headlamps can not be directly replaced by the LED light source, so that the automobile lighting regulation can not be met.

Moreover, the LED light source has a large size and the LED chips are arranged in a dispersed manner, so that the LED chips are difficult to dissipate heat, and the service life of the LED light source is short; it is of course possible to add additional heat sinks to help dissipate heat from the LED chips, which in turn increases the cost of the vehicle lamp.

In view of the above situation, how to arrange an LED light source to have a size close to the size of a halogen bulb, and to achieve a light distribution requirement substantially the same, and to achieve better heat dissipation is a problem to be solved in the art.

Disclosure of Invention

The invention aims to solve the problem that the existing LED replaces a halogen lamp, and firstly provides an LED light distribution device.A LED chip forms an LED light source after light distribution of 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 a 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:

an LED light distribution device capable of replacing a halogen bulb in a halogen car lamp by an LED is structurally a rotator structure formed by a closed plane figure rotating by taking one straight line side as an axis, wherein the LED light distribution device sequentially comprises a light incident end, a middle light guide body and a light emergent end from back to front along the direction of a rotating axis; the light incident end is provided with a first refraction curved surface, a second refraction curved surface and a first reflection curved surface, and the light emergent end is provided with a second reflection curved surface and a vertical light-transmitting curved surface.

The closed plane figure 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 middle light guide body side bus, a vertical light-transmitting curved surface bus and a second reflection curved surface bus end to end.

The rear end of the first refraction curved surface bus is connected with the rear end of a linear edge serving as a rotating shaft, and the front end of the first refraction curved surface bus is far away from the rotating shaft center; the front end of the second refraction curved surface bus is connected with the front end of the first refraction curved surface, and the rear end of the second refraction curved surface bus is connected with the rear end of the first reflection curved surface bus; the front end of the first reflecting curved surface bus is connected with the rear end of a bus on the side surface of the middle light guide body; the front end of the side bus of the middle light guide body is connected with the rear end of the vertical light-transmitting curved surface bus, the front end of the vertical light-transmitting curved surface bus is connected with the front end of the second reverse curved surface bus, and the rear end of the second reflecting curved surface bus is connected with the front end of the linear edge serving as the rotating shaft.

The light source light-emitting point is arranged on the rotating shaft center and is positioned behind the first refraction curved surface, and the rear end of the second refraction curved surface bus is positioned in front of the projection point on the rotating 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 then emitted to a virtual focus in front of the second reflection curved surface on the rotation center; the light rays emitted from the light emitting point of the light source to the second refraction curved surface are reflected by the first reflection curved surface and then are emitted to the virtual focus.

The second reflecting curved surface is positioned on a path where the light rays refracted by the first refracting curved surface and reflected by the first reflecting curved surface are emitted to the virtual focus, and the light rays refracted by the first refracting curved surface and reflected by the first reflecting curved surface are reflected by the second reflecting curved surface and then emitted to the side surface through the vertical light-transmitting curved surface.

In the present invention, the light incident end direction of the LED light distribution device is set to be rear, and the light emitting end direction is set to be front, and one of the two ends of each side constituting the closed planar figure, which is projected on the rotation axis in front, is set to be front, and the other end is set to be 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 emits the light rays to the side surface uniformly through reflection of the near-conical reflection curved surface at the front end. On the one hand, adopt LED grading device, LED chip set up the position by the rear, and the LED chip is close to the interface, and LED chip heat can directly conduct for the interface, and convenient heat dissipation does not consequently need to be used for conducting the heat to other heat radiation structure of interface from the LED chip to the LED chip setting.

On the other hand, the light emitted by the LED chip at 180 degrees is uniformly emitted to the side surface after being distributed by the LED light distribution device.

The advantages are that:

1. compared with the prior art that the LED chips are arranged on the four sides of the polygonal column to simulate the mode that the halogen bulb emits light to the periphery, the LED light distribution device provided by the invention only needs to arrange one or one 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 can be reduced.

2. The light emitted from the center to the side face is the most main component of the light emitted by the halogen bulb in 360 degrees, and after the LED light distribution device is adopted, the LED light simply emits light from the side face, and other light forms are avoided, so that the LED light distribution device is suitable for light distribution of the existing automobile lamp for the halogen lamp.

3. By adopting the LED light distribution device, all light rays are uniformly converged towards the virtual focus when being shot to the second reflecting curved surface from the rear end. When the second reflecting curved surface is close to the virtual focus as much as possible, the light emitted from the side surface has higher concentration degree, so that a light emitting area as small as a halogen filament can be achieved.

Alternatively, the middle light guide body is of a conical structure, the diameter of the front port is small, the diameter of the rear port is large, and a side generatrix of the middle light guide body is parallel to an outermost light ray which is reflected by the first reflecting curved surface on the same plane and then emits to the virtual focus.

Alternatively, the main body part of the middle light guide body is of a conical structure, the diameter of a front port of the main body part is small, the diameter of a rear port of the main body part is large, a side bus of the middle light guide body consists of a side bus of the conical main body part and a side bus of a 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 one light ray which is reflected to the outermost side of the virtual focus on the same plane by the first reflecting curved surface.

Optionally, the first curved reflecting surface is a curved reflecting surface relative to the light emitting point of the light source.

Optionally, the first reflective curved surface is composed of a primary total reflection curved surface and a secondary total reflection curved surface, the light refracted by the second refractive curved surface is totally emitted to the primary total reflection curved surface of the first reflective curved surface, reflected by the primary total reflection curved surface of the first reflective curved surface and then emitted to the virtual focus after being reflected by the secondary total reflection curved surface of the first reflective curved surface.

Optionally, the second reflective curved surface is also composed of a primary total reflection curved surface and a secondary total reflection curved surface, the light beam reflected by the secondary total reflection curved surface of the first reflective curved surface and then emitted to the virtual focus is totally irradiated onto the primary total reflection curved surface of the second reflective curved surface, the light beam reflected by the primary total reflection curved surface of the second reflective curved surface and then emitted to the lateral surface from the vertical light-transmitting curved surface after being reflected by the secondary total reflection curved surface of the second reflective curved surface.

Optionally, the light is reflected by the second reflective curved surface and then emitted to the side surface along a direction perpendicular to the rotation axis, and the vertical 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 is emitted out in a fan shape to the side surface, the generatrix of the vertical light-transmitting curved surface is an arc line, and the center of the arc line is the same as the 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.

Specifically, the method comprises the following steps: the LED light distribution device is of a rotating body structure formed by rotating a closed plane figure by taking one straight line side as an axis, and sequentially comprises a light incident end, a middle light guide body and a light emergent end from back to front along the direction of a rotating axis; the light incident end is provided with a first refraction curved surface, a second refraction curved surface and a first reflection curved surface, and the light emergent end is provided with a second reflection curved surface and a vertical light-transmitting curved surface;

the closed plane figure is formed by sequentially connecting and enclosing a straight line side serving as a rotating shaft, a first refraction curved surface bus, a second refraction curved surface bus, a first reflection curved surface bus, a middle light guide body side bus, a vertical light-transmitting curved surface bus and a second reflection curved surface bus end to end;

the rear end of the first refraction curved surface bus is connected with the rear end of a linear edge serving as a rotating shaft, and the front end of the first refraction curved surface bus is far away from the rotating shaft center; the front end of the second refraction curved surface bus is connected with the front end of the first refraction curved surface, and the rear end of the second refraction curved surface bus is connected with the rear end of the first reflection curved surface bus; the front end of the first reflecting curved surface bus is connected with the rear end of a bus on the side surface of the middle light guide body; the front end of a lateral bus of the middle light guide body is connected with the rear end of a vertical light-transmitting curved surface bus, the front end of the vertical light-transmitting curved surface bus is connected with the front end of a second reverse curved surface bus, and the rear end of the second reflecting curved surface bus is connected with the front end of a linear edge serving as a rotating shaft;

the LED chip is arranged on the center of the rotating shaft 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 light rays emitted from the LED chip to the first refraction curved surface are refracted by the first refraction curved surface and then emitted to a virtual focus in front of the second reflection curved surface on the rotation center; the light rays emitted from the LED chip to the second refraction curved surface are reflected by the first reflection curved surface and then are emitted to the virtual focus;

Further, all descriptions of the LED light distribution device in the present invention are applicable to the LED light source.

The beneficial effects of the invention adopting the technical scheme are as follows:

the LED light distribution device enables light rays emitted from an LED light source to irradiate a second reflecting curved surface after being refracted by a first refracting curved surface and to be emitted in parallel after being reflected by the second reflecting curved surface through arrangement of a light ray incidence end, a middle light guide body and a light ray emitting end; the light rays in the large-angle area are refracted by the second refraction curved surface and then enter the first reflection curved surface, are reflected by the first reflection curved surface, are transmitted for a distance in the middle light guide body, irradiate the second reflection curved surface, and are reflected by the second reflection curved surface and then exit in parallel.

After the LED light source is subjected to light distribution by the LED device, the light distribution of the LED light source is completely the same as that of the halogen lamp filament, so that the lamp filament in the halogen car headlamp can be replaced, and the LED car headlamp is formed.

Compared with the prior art that LED chips are arranged on four sides of a polygonal column to simulate a halogen bulb to emit light to the periphery, the LED light distribution device provided by the invention only needs to arrange one or one 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 conventional automobile lamp can be reduced.

The LED light distribution device is characterized in that the LED chip is arranged at the rear position, the LED chip is close to the interface, and the heat of the LED chip can be directly conducted to the interface, so that heat dissipation is convenient, and other heat dissipation structures for conducting the heat from the LED chip to the interface are not required to be arranged aiming at the LED chip.

Drawings

Fig. 1 is a schematic view of an optical path principle when an LED light distribution device and an LED chip are combined in embodiment 1 of the present invention;

FIG. 2 is an enlarged view of a portion a of FIG. 1;

FIGS. 3 and 4 are schematic diagrams illustrating the derivation process of the free-form surface B-M calculation in embodiment 1;

FIG. 5 is a diagram illustrating the derivation of the calculation of the free-form surfaces A-C in example 1 according to the present invention;

fig. 6 is a schematic view of the principle of the light path when the LED light distribution device is combined with an LED chip in embodiment 2 of the present invention;

fig. 7 is an enlarged view of a portion b in fig. 6.

The figures are numbered: a light incident end 1; a middle light guide 2; a light exit end 3; a rotation axis 4.

Detailed Description

In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

In the description of the present invention, the term "at least one" means one or more than one 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 embodiment of the invention is as follows:

example 1: the structural characteristics and realizability of the LED light distribution device are further described below with reference to the accompanying drawings.

Fig. 1 and 2 are schematic diagrams of a two-dimensional light path principle of a preferred scheme of the LED light distribution device of the present invention, and an entity 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 figure M-B-a-C-D-E-F-G, by 360 degrees around a rotation axis 4 (a straight line corresponding to an OV connection line).

The LED light distribution device sequentially comprises a light incident end 1, a middle light guide body 2 and a light emergent end 3 from back to front along the direction of a rotating shaft center 4; the light incident 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-transmitting curved surface.

The intermediate light guide 2 is provided with a side surface of a connecting section of the intermediate light guide 2 and a side surface of a tapered main body portion of the intermediate light guide 2.

The first refraction curved surface is a curved surface formed by rotating a parabola MB in the figure 1 around a rotation axis 4 by taking the parabola MB as a generatrix, namely a curved surface represented by B-Q in the figure 1; the second refraction curved surface is a curved surface formed by rotating a circle around the rotation axis 4 by taking a line segment BA in fig. 1 as a generatrix, namely a curved surface represented by a-B, P-Q in fig. 1; the first reflecting curved surface is a curved surface formed by one rotation around the rotation axis 4 using a parabola AC in fig. 1 as a generatrix, i.e., 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 around the rotation axis 4 with the line segment CD as a generatrix is a side surface of a connecting section of the intermediate light guide 2, and has a function of ensuring that the outline range of the intermediate light guide 2 is larger than the range of light rays reflected by the first reflective curved surface; the curved surface formed by rotating one revolution around the rotation axis 4 with the line segment DE as a generatrix is the side surface of the tapered main body portion of the intermediate light guide 2.

The vertical light-transmitting curved surface is a curved surface formed by rotating a circle around the rotation axis 4 by taking a line segment EF parallel to the rotation axis 4 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 one rotation using the parabola FG as a generatrix, i.e., a curved surface represented by F-G, G-K in fig. 2, and light rays reflected by the second reflecting curved surface are all vertically emitted to the vertical light-transmitting curved surface.

The parabola MB, the line segment BA, the parabola AC, the line segment CD, the line segment DE, the line segment EF and the parabola FG are sequentially connected end to end.

As can be seen from the above, in the plan views shown in fig. 1 and 2: MB-BA-AC is used as a light incidence end 1 of the LED light distribution device, the CDE part is a middle light guide body 2, the CD part is a connecting part of the middle light guide body 2, the DE part is a conical light transmission part of the middle light guide body 2, and EFG is used as a light emergence end 3 of the LED light distribution device.

When in application, the LED chip is placed at the point O, which is located at the right side of the AP plane, that is, the LED chip is placed in the area between the AB plane and the BQ plane and is on the rotating shaft center 4.

The LED light source is a typical Lambert light source, and in emergent rays of the LED light source, the emergent rays are divided into two parts which are respectively a small-angle area and a large-angle area according to an emergent angle; specifically, the area enclosed by OB, OQ and BQ in fig. 1 is a small angle area; in the figure, the area enclosed by OB, OA or OQ, OP is a large angle area, and the boundary line between large angle and small angle is OB or OQ. The included angle between the OB and the rotating shaft center 4 is preferably 41 degrees, and when the included angle between the emergent ray and the rotating shaft center 4 is smaller than 41 degrees, the emergent ray enters a small-angle area; when the angle between the emergent ray and the rotating shaft center 4 is larger than 41 degrees, the emergent ray enters a large-angle area.

The light rays in the small-angle area are refracted by the first refraction curved surface B-Q and then enter the second reflection curved surface F-G, and the refracted light rays are reflected by the second reflection curved surface F-G and then emitted out of the LED light distribution device in parallel; the light refracted by the first refracting curved surface B-Q has its extended line converged at the point V (virtual focus). The light rays in the large-angle area are refracted by the second refraction curved surfaces A-B and then reflected by the first reflection curved surfaces A-C, the reflected light rays are reflected by the second reflection curved surfaces F-G and then emitted out of the LED light distribution device in the same way as parallel light, and the extension lines of the light rays reflected by the first reflection curved surfaces A-C are converged at a V point (virtual focus).

The following explains the traveling paths of the light rays in the small angle region and the large angle region, respectively, by taking the light ray OHRI and the light ray OLXWU in fig. 1 and 2 as examples.

1. The light OHRI: emergent light rays of the LED light source are emitted from the point O, emergent light OH is refracted through the first refraction curved surfaces B-Q in a small-angle area to form light rays HR, the light rays HR are incident on the second reflection curved surfaces F-G and are reflected through the second reflection curved surfaces F-G to form light rays RI, and the light rays RI are vertically incident on the vertical light-transmitting curved surfaces E-F and are emitted out of the LED light distribution device as parallel light.

2. Ray olxuu: emergent light rays of the LED light source are emitted from the point O, emergent light OL is refracted through the second refraction curved surfaces A-B in a large-angle area to form light rays LX, the light rays LX are reflected through the first reflection curved surfaces A-C to form light rays XW, the light rays XW are reflected through the second reflection curved surfaces F-G to form light rays WU, and the light rays WU vertically enter the vertical light-transmitting curved surfaces E-F and are emitted out of the LED light distribution device in parallel.

Next, taking the light rays OBR ' I ' and OL ' CW ' U ' in fig. 1 and 2 as an example, the traveling paths of the critical light rays in the small angle region and the large angle region and the outermost light ray which is incident through the large angle region and reflected by the first reflective curved surface and then emitted to the V point (virtual focus) are respectively explained.

1. Light rays OBR 'I': 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 the small-angle area to form a light BR ', the light BR ' is critical light in the small-angle area and the large-angle area, the light BR ' enters the second reflection curved surface F-G and is reflected through the second reflection curved surface F-G to form a light R ' I ', and the light R ' I ' vertically enters the vertical light-transmitting curved surface E-F and is emitted out of the LED light distribution device as parallel light.

2. Light line OL ' CW ' U ': emergent light rays of the LED light source are emitted from the point O, emergent light OL ' is refracted through the second refraction curved surface A-B in a large-angle area to form light rays L ' C, the light rays L ' C are reflected through the first reflection curved surface A-C to form light rays CW ' parallel to the line segment DE, the light rays CW ' are light rays at the outermost side, the light rays W ' U ' are reflected through the second reflection curved surface F-G to form light rays W ' U ', and the light rays W ' U ' vertically enter the vertical light-transmitting curved surface E-F and are emitted out of the LED light distribution device as parallel light.

As shown in fig. 3 to 5, the first refractive curved surface B-Q is a free curved surface (or a high-order aspheric surface) which is calculated to ensure that the extension line of the light emitted from the LED crosses the point V after passing through the B-Q surface. The first reflecting curved surface A-C is a free curved surface (or a high-order aspheric surface), and the surface shape is obtained by calculation, so that the extension lines of the light rays emitted from the LED are ensured to be intersected at a V point after the light rays are reflected by the A-C surface. The light is refracted by the second refraction curved surface A-B and then enters the A-C surface, and all the light entering the A-C surface meets the total reflection condition. The second reflecting curved surface F-G is a paraboloid, and V is the focus of the paraboloid. The point O and the point V are in an object-image relationship 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 dividing angle (the dividing angle is 30-60 degrees) and the positions of a point B and a point A in a graph need to be determined; these are used as initial conditions, and when the initial conditions are selected, it is necessary to ensure that the refracted light rays passing through the second refraction curved surface A-B are incident on the A-C surface to satisfy the total reflection condition.

Then, calculating the free-form surface B-M by analyzing the light rays in the small-angle area, wherein the calculation derivation process is shown in figures 3 and 4, the light rays emitted from the O point are sampled according to equal angles, for example, one light ray is taken as a sampling light ray every 1 degree, and the smaller the angle of the sampling light ray is, the better the sampling light ray is. After each ray is refracted by the free-form surface, the extension lines of the rays are intersected at the V point. Because the point B is determined as an initial condition, light enters the point B from the light source O, and the extension line converges at the point V after refraction; according to the law of refraction, the normal vector passing through the point B can be obtained, so that the tangent line passing through the point B can be obtained; a second sampling ray emitted from the point O is intersected with a tangent line passing through the point B, the intersection point is the point B1, the second ray is refracted through the point B1, and the extension lines of the refracted rays converge at the point V; according to the law of refraction, the normal vector of the point B1 can be obtained, so that the tangent of the point B1 can be obtained, the tangent of the point B1 intersects with the third sampling ray, so that the point B2 (not shown) can be obtained, and all the points of the B-M surface can be obtained by repeating the process.

Calculating and deducing an A-C surface by analyzing the light rays in the large-angle area, wherein the A-C surface is also a free-form surface, the process of calculating the A-C surface is as shown in figure 5, because the point A is determined as an initial condition, the light rays enter the point A from the light source O, and the refracted extension lines converge at the point V; according to the law of refraction, the normal vector of the point A can be obtained, and therefore the tangent of the point A can be obtained; the second sampling light ray emitted from the point O firstly passes through the side end surface AB, the incident point is a point T1, the intersection point of the light ray emitted from the point T1 and the tangent line passing through the point A is a point A1, and after the light ray emitted from the point T2 is reflected by the point A1, the extension line of the reflected light ray intersects with the point V, so that the normal vector passing through the point A1 can be obtained, and the tangent line passing through the point A1 can be obtained; and the third sampling light ray is refracted by the point T2 and then intersects with the tangent line passing the point A1 to obtain a point A2, and the process is repeated continuously to obtain a sampling point on the whole A-C surface.

Example 2: as shown in fig. 6 and 7, the present invention is different from embodiment 1 in that: in this embodiment, the first curved reflective surface a-C is composed of a first curved reflective surface a-Y and a second curved reflective surface Y-C, and the light refracted by the second curved reflective surface a-B is totally directed to the first curved reflective surface a-Y, reflected by the first curved reflective surface a-Y and directed to the second curved reflective surface Y-C, and reflected by the second curved reflective surface Y-C and directed to the point V (virtual focus).

The second reflecting curved surface F-G also comprises a primary total reflecting curved surface F-Z and a secondary total reflecting curved surface Z-G, all light rays which are reflected to the point V (virtual focus) by the secondary total reflecting curved surface Y-C of the first reflecting curved surface A-C are irradiated onto the primary total reflecting curved surface F-Z of the second reflecting curved surface F-G, are reflected by the primary total reflecting curved surface F-Z to be irradiated to the secondary total reflecting curved surface Z-G of the second reflecting curved surface F-G, and are reflected by the secondary total reflecting curved surface Z-G to be irradiated out from the vertical light-transmitting curved surface E-F.

As exemplified below, as shown by the light ray OL ' ' X ' Y ' W ' ' Z ' U ' ', the emergent light ray of the LED light source is emitted from the point O, the emergent light OL ' ' is refracted by the second refraction curved surface A-B in the large angle region to form the light ray L ' ' X ' ', the light ray L ' ' X ' is reflected by the first total reflection curved surface A-Y of the first reflection curved surface A-C to form the light ray X ' Y ', the light ray X ' Y ' is reflected by the second total reflection curved surface Y-C of the first reflection curved surface A-C to form the light ray Y ' W ' ', the light ray Y ' W ' ' is reflected by the first total reflection curved surface F-Z of the second reflection curved surface F-G to form the light ray W ' ' Z ', the light ray W ' ' Z ' is reflected by the second total reflection curved surface Z-G of the second reflection curved surface F-G to form the light ray Z ' U ' ', the light Z 'U' is perpendicularly incident on the vertical light-transmitting curved surface E-F and exits as parallel light.

Claims

1. An LED grading device which characterized in that: the structure of the light distribution device is a rotator structure formed by rotating a closed plane figure by taking one of straight line edges as an axis, and the light distribution device sequentially comprises a light ray incidence end, a middle light guide body and a light ray emergence end from back to front along the direction of a rotating axis; the light incident end is provided with a first refraction curved surface, a second refraction curved surface and a first reflection curved surface, and the light emergent end is provided with a second reflection curved surface and a vertical light-transmitting curved surface;

the light source light-emitting point is arranged on the rotating shaft center and is positioned behind the first refraction curved surface, and the rear end of the second refraction curved surface bus is positioned in front of the projection point on the rotating 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 then emitted to a virtual focus in front of the second reflection curved surface on the rotation center; the light rays emitted from the light source luminous points to the second refraction curved surface are reflected by the first reflection curved surface and then are emitted to the virtual focus;

2. The LED light distribution device of claim 1, wherein: the middle light guide body is of a conical structure, the diameter of a front port is small, and the diameter of a rear port is large;

and the lateral generatrix of the middle light conductor is parallel to one light ray which is reflected to the outermost side of the virtual focus on the same plane by the first reflecting curved surface.

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 diameter of a front port of the main body part is small, the diameter of a rear port of the main body part is large, a side bus of the middle light guide body consists of a side bus of the conical main body part and a side bus of a 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 of claim 3, wherein: the generatrix of the conical main body part is parallel to one light ray which is reflected to the outermost side of the virtual focus on the same plane by the first reflecting curved surface.

5. The LED light distribution device of claim 1, wherein: the first reflecting curved surface is a total reflecting curved surface relative to the light emitting point of the light source.

6. The LED light distribution device of claim 1, wherein: the first reflecting curved surface consists of a primary total reflecting curved surface and a secondary total reflecting curved surface, all light rays refracted by the second reflecting curved surface are irradiated to the primary total reflecting curved surface of the first reflecting curved surface, are irradiated to the secondary total reflecting curved surface of the first reflecting curved surface after being reflected by the primary total reflecting curved surface of the first reflecting curved surface, and are irradiated to the virtual focus after being reflected by the secondary total reflecting curved surface of the first reflecting curved surface.

7. The LED light distribution device of claim 1, wherein: the second reflecting curved surface consists of a primary total reflection curved surface and a secondary total reflection curved surface, all light rays which are reflected by the secondary total reflection curved surface of the first reflecting curved surface and then irradiate to the virtual focus are irradiated to the primary total reflection curved surface of the second reflecting curved surface, are reflected by the primary total reflection curved surface of the second reflecting curved surface and then irradiate to the secondary total reflection curved surface of the second reflecting curved surface, and are reflected by the secondary total reflection curved surface of the second reflecting curved surface and then are emitted from the vertical light-transmitting curved surface to the side surface.

8. The LED light distribution device of claim 1, wherein: and the light rays are reflected by the second reflecting curved surface and then are emitted to the side surface along the direction vertical to the rotating axis, and the vertical light-transmitting curved surface generatrix is a straight line parallel to the rotating axis.

9. The LED light distribution device of claim 1, wherein: the light is reflected by the second reflection curved surface and then is emitted out in a fan shape to the side surface, the generatrix of the vertical light-transmitting curved surface is an arc line, and the circle center of the arc line is the same as the position of the circle center of the fan shape.

10. An LED lamp for replacing a halogen car light bulb, characterized in that: the LED light distribution device is formed by combining an LED chip and the LED light distribution device as claimed in any one of claims 1 to 9.