CN106594675B

CN106594675B - LED total reflection lens and LED line light source

Info

Publication number: CN106594675B
Application number: CN201710005608.7A
Authority: CN
Inventors: 牛磊; 何士群; 胡尚斌; 严辉; 陈嘉彬
Original assignee: HASCO Vision Technology Co Ltd
Current assignee: HASCO Vision Technology Co Ltd
Priority date: 2017-01-04
Filing date: 2017-01-04
Publication date: 2023-03-31
Anticipated expiration: 2037-01-04
Also published as: CN106594675A

Abstract

The invention relates to an LED total reflection lens and an LED line light source, wherein the lens is an integral polyhedron, the outline of the main body of the lens is formed by combining a cuboid and an upper 180-degree semicircular frustum which is attached to the middle part of the front surface of the cuboid and has the same size, the lower bottom surface of the upper 180-degree semicircular frustum is completely attached to the lower bottom surface of the cuboid, the upper bottom surfaces of the two semicircular frustums are respectively flush with the top surface and the bottom surface of the cuboid, the front left and right sides of the cuboid are respectively provided with a total reflection surface type chamfer surface, the centers of the top surface and the bottom surface of the polyhedron are respectively and oppositely provided with a light incident surface and a reflection surface type concave curved surface, the cuboid is also provided with a refraction hole, one or more perforation type total reflection surfaces are respectively arranged between the refraction hole and the left and right chamfer surfaces, and the back of the cuboid is a light emergent surface. The lens can uniformly distribute the LED light rays in a Lambert light-emitting form to realize a uniform linear visual effect, the light energy utilization rate is high, and the LED line light source can realize a linear light-emitting effect with longer length and uniform light emission by using fewer LEDs.

Description

LED total reflection lens and LED line light source

Technical Field

The invention relates to an LED total reflection lens and an LED line light source.

Background

The LED has long service life, low energy consumption and mature production technology, and can be produced and supplied in a large scale. The LED light source is widely applied to automobile illumination and decoration, road illumination, projectors and indoor and outdoor illumination decoration at present. Most conventional LEDs cannot meet the optical requirements of various occasions because of the symmetrical Lambertian radiation of the light-emitting characteristics. In order to meet the light efficiency and light distribution requirements of various occasions and improve the performance of a system, the secondary optical design for accurately controlling light distribution needs to be carried out on an LED, and light energy emitted by an LED chip is reasonably distributed.

For the secondary optical design of the LED, generally, the light distribution is carried out by adopting reflectors such as an aluminum-plated reflecting surface or a reflecting cup, however, the light energy cannot be distributed efficiently and uniformly by the reflector, and the effect is that the light intensity in the direction of the optical axis of the LED is large and the light intensity around the LED gradually decreases.

The light energy of the LED is distributed by the transmission-type refractor such as a convex lens, but the light energy utilization rate of the LED is low, the light with a large light emitting angle cannot be utilized, and the capability of controlling the light is limited.

The light of the LED is collimated and then distributed by a Total Reflection (TRI) condenser, the TRI lens is generally a circular rotating body around the optical axis of the LED, and for some occasions where the light emitting surface or the light distribution requirement is square, the rotating body needs to be cut, which often results in the reduction of energy utilization rate.

The automobile tail lamp, the brake lamp, the daytime running lamp, the front position lamp, some lighting lamps and decorative lamps are required to be capable of realizing a light source capable of linearly emitting light, realize a linear effect of uniformly emitting light and meet a certain light distribution requirement. The current solutions to achieve the linear effect are the following:

as shown in fig. 1, an LED light source 1 is located at one end of a light guide 2, and after entering the light guide, light is totally reflected and propagated inside the light guide to the other end of the light guide, in order to obtain a linear light emitting effect, an optical structure such as a light guide tooth 3 or a microstructure is added on the back of a light emitting surface of the light guide, and the effect of the linear light source is achieved through total reflection. The light guide scheme has low light energy utilization rate, generally only about 25 percent, requires very high power of a single LED in order to meet the requirement of large light intensity, has very high heat dissipation design requirement on the whole optical system, has a longer light guide, larger die, higher cost, very large design and processing difficulty, and has poor control capability of the microstructure and the light guide teeth on light distribution.

Another scheme is a lamp strip scheme in which a plurality of LEDs are densely distributed, as shown in fig. 2, a plurality of LEDs 1 penetrate the lens 4 (which may be transparent PC, transparent PMMA, or a scattering material) directly, and continuous and uniform light emitting effects are achieved by intersecting light rays of adjacent LEDs. The proposal has simple design and convenient installation, but to obtain a more uniform linear light source, the number of LEDs required for a longer linear light source is very large, which greatly increases the cost of the system.

In another scheme, a conventional TIR (total reflection) lens is adopted, as shown in fig. 3, which is a schematic diagram of a linear light source of a conventional LED condenser, a plurality of LEDs 1 and a plurality of TIR lenses 5 cooperate to form a linear light emitting effect, and the number of LEDs used in the scheme is also large.

Based on the above situation, in the existing solutions for realizing the linear visual effect of uniform light emission, there is no light that is easy to control, and the solution of longer linear effect than the light guide strip or the LED light bar can be obtained under the condition of using less LEDs.

Disclosure of Invention

In order to solve the above problems in the prior art, the present invention provides an LED total reflection lens and an LED line light source, where the LED total reflection lens can uniformly distribute LED light in lambertian lighting form to achieve a uniform linear visual effect, and the light energy utilization rate is higher than that of a light guide technology, and the LED line light source formed by the LED total reflection lens can achieve a linear lighting effect with a longer length and uniform lighting with fewer LEDs.

The main technical scheme of the invention is as follows:

the main body outline of the LED total reflection lens is formed by combining a cuboid and an upper 180-degree semicircular frustum which is located in the middle of the front face of the cuboid and has the same size and the same lower bottom face completely attached, the longitudinal plane of the 180-degree semicircular frustum is flush with the front face of the cuboid, the left side and the right side of the longitudinal plane do not exceed the front face of the cuboid, the upper bottom face of the 180-degree semicircular frustum is flush with the top face and the bottom face of the cuboid respectively and jointly forms the top face and the bottom face of the polyhedron, the prime line of the 180-degree semicircular frustum is 45 degrees relative to the lower bottom, two original edges of the left front face and the right front face of the cuboid are arranged to form chamfer faces, the chamfer faces are curved surface cylindrical faces perpendicular to the top face, the chamfer faces are total reflection faces, a circular area which takes the center of the upper bottom face of the 180-degree semicircular frustum as the circle center is arranged on the top face of the polyhedron as a light incident face, the incident face is a plane or a rotationally symmetrical outward convex curved surface, the upper bottom face of the 180-degree semicircular frustum center of the 180-degree semicircular frustum is arranged to form a circular perforated hole, and the vertical total reflection hole is arranged to form a perforated hole, and the full reflection hole which is arranged between the vertical hole and the full reflection face of the cuboid, and the full reflection hole is arranged to form a plurality of the full reflection face of the full reflection hole.

The surface shape of the concave curved surface is preferably a surface shape which can make the light rays entering the polyhedron through the convex curved surface totally reflect on the concave curved surface and the reflected light rays are positioned on a horizontal plane.

The other cylindrical surfaces except the total reflection surface in the straight cylindrical surface which surrounds the total reflection hole can be a single curved surface cylindrical surface or a combined cylindrical surface formed by sequentially connecting a plurality of cylindrical surfaces, and the combined cylindrical surface consists of a curved surface cylindrical surface and/or a plane cylindrical surface; the refraction hole can be a cylindrical hole, an elliptic cylindrical hole or a hole formed by a plurality of straight cylindrical surfaces in a surrounding manner, and when the refraction hole is a hole formed by a plurality of straight cylindrical surfaces in a surrounding manner, the straight cylindrical surface forming the refraction hole is a curved cylindrical surface or a plane cylindrical surface.

The hole wall of the folded hole can be formed by four straight cylindrical surfaces in the front, the rear, the left and the right, wherein the front cylindrical surface can be a cylindrical surface with a concave back middle part, the rear cylindrical surface is a plane extending in the left and the right directions or a cylindrical surface with a convex front middle part, and the left cylindrical surface and the right cylindrical surface are planes extending in the front and the rear directions.

The horizontal cross section of the curved surface cylindrical surface can be a circular arc or a parabola and can also be other various free curves according to the design requirement.

The refraction hole is preferably in a left-right symmetrical structure, and a symmetrical center plane passes through the axis of the 180-degree semicircular frustum.

All the total reflection holes are preferably distributed in a left-right symmetrical mode, and certainly can be distributed in an asymmetrical mode, when the total reflection holes are distributed in a left-right asymmetrical mode, the number of the total reflection holes on the left side and the right side can be opposite or unequal, when the total reflection holes are unequal in number, the side with the larger number preferably comprises the total reflection holes which are symmetrical to all the total reflection holes on the side with the smaller number, and a symmetrical center plane of the left-right symmetrical side passes through the axis of the 180-degree semi-conical frustum or is the same plane with the symmetrical center plane of the left-right of the folded hole.

Further, the polyhedron is preferably in a left-right symmetrical structure, and a symmetrical center plane passes through the axis of the 180-degree half frustum.

The material of the polyhedron can be glass, PC or PMMA.

The light ray emergent surface is a plane or a curved surface, and patterns or microstructures can be arranged on the light ray emergent surface.

As a preferred technical scheme, the axis of the 180-degree semi-conical frustum is taken as a common axis, sharp-angled regions corresponding to the light incident surface of the zigzag hole, the total reflection surface of the total reflection hole and the chamfer surface are sequentially continuous, and the sharp-angled region formed by sequentially splicing the sharp-angled regions has a sharp-angled angle of 180 degrees.

As a further preferable mode, in the front-rear direction, a rear one of adjacent two of the light incident surface of the folded hole, the total reflection surface of each total reflection hole, and each chamfered surface does not block a front one.

The LED line light source comprises one or more LED line light source units, wherein each LED line light source unit comprises an LED and an optional LED total reflection lens, the LED is arranged above the light incidence surface of the LED total reflection lens correspondingly, the light emitting surface of the LED faces the light incidence surface, and when the LED line light source units are multiple, the LED total reflection lenses are sequentially arranged from left to right.

The invention has the beneficial effects that:

the lens has more optical refraction and total reflection structures, the LED light is collected, collimated or diffused and redistributed for multiple times through different structures, the LED light in a Lambert luminous form can be uniformly distributed to realize a uniform linear visual effect, and the light energy utilization rate can reach more than 85 percent and is far higher than 25 percent of the light guide technology.

The lens main body structure is reasonable, the refraction and total reflection structures can be freely changed to realize free distribution of LED light, and Lambertian luminous LED light is uniformly distributed to realize a longer linear light source effect.

The total reflection lens can realize the collimation and the emergent of the LED light and can diffuse the LED light as required by the change and the matching of the refraction and the total reflection structure. The LED collimating device can be used as an LED collimating device, and can also be applied to occasions where functional light intensity needs to be distributed according to needs, such as automobile lamps and the like.

Compared with the light guide scheme, the processing cost and the assembly difficulty are reduced, and the energy utilization rate is greatly improved.

Compared with a scheme of densely distributing a plurality of LEDs and a scheme of a traditional TIR (total reflection) lens, the total reflection lens uses less LEDs to realize the effect of a linear light source with the same length, and the cost is greatly reduced.

Drawings

FIG. 1 is a schematic diagram of a light-guided linear light source;

FIG. 2 is a schematic diagram of a light strip linear light source with densely distributed LEDs;

FIG. 3 is a schematic diagram of a conventional LED lensed linear light source;

FIG. 4 is a schematic structural diagram of an LED linear light source unit (corresponding to a combination of the LED total reflection lens and an LED) according to the present invention;

FIG. 5 is a top view of FIG. 4;

FIG. 6 isbase:Sub>A sectional view taken along line A-A of FIG. 5;

FIG. 7 isbase:Sub>A schematic view of light propagation on section A-A of FIG. 5;

FIG. 8 is a bottom view of FIG. 4;

FIG. 9 is the drawing of FIG. 4 a front view of;

FIG. 10 is a cross-sectional view B-B of FIG. 9;

FIG. 11 is a schematic view of light propagation on section B-B of FIG. 9;

FIG. 12 is a side view of a lens of the present invention;

FIG. 13 is a schematic structural diagram of a second embodiment of a total reflection LED lens according to the present invention;

FIG. 14 is a schematic structural diagram of a third embodiment of an LED total reflection lens of the present invention;

fig. 15 is a schematic structural diagram of an embodiment of an LED line light source of the present invention.

Detailed Description

The invention discloses an LED total reflection lens (lens for short), which is an integrated polyhedron, and is shown in figures 4-14, the main body outline of the LED total reflection lens is formed by combining a cuboid I and upper and lower 180-degree semicircular frustums II and III which are positioned in the middle of the front surface of the cuboid and have the same size and the lower bottom surfaces of which are completely attached. The body formed by overlapping the two 180-degree half-conical frustums is similar to a half spindle body. The 180-degree semicircular frustum refers to any part of the truncated cone which is obtained by cutting through any plane passing through the axis of the frustum cone, and the any plane can be called as a longitudinal plane. The longitudinal plane of the 180-degree semi-conical frustum is attached to the front face of the cuboid, and the left side and the right side of the longitudinal plane of the 180-degree semi-conical frustum do not exceed the front face of the cuboid. The upper bottom surfaces of the upper 180-degree semicircular frustum and the lower 180-degree semicircular frustum are flush with the top surface and the bottom surface of the cuboid respectively and jointly form the top surface and the bottom surface of the polyhedron respectively. The plain line of the 180-degree semicircular frustum forms an angle of 45 degrees with the lower bottom surface. The chamfer face 11 is arranged at the position of the edge which is originally arranged at the left front side and the right front side of the cuboid, the chamfer face is a curved surface cylindrical surface vertical to the top surface, the chamfer face is a total reflection face, a circular area which takes the center of the upper bottom face of the 180-degree semicircular frustum II as the center of a circle on the top surface of the polyhedron is arranged as a light incidence face 7, the light incidence face is a plane or a convex curved surface with rotational symmetry, the convex is convex above the top surface of the polyhedron, and the diameter of the circular area is smaller than that of the upper bottom face of the 180-degree semicircular frustum. The bottom surface of the polyhedron is provided with a rotationally symmetrical inner concave curved surface 8 with a central point depressed, wherein a circular area with the center of the upper bottom surface of the corresponding 180-degree half-cone frustum III as the center of a circle and the radius of the upper bottom surface as the radius is arranged on the bottom surface of the polyhedron, and the inner concave curved surface is a total reflection surface and is used for receiving all light rays which are injected into the polyhedron through the outer convex curved surface. The rear of the cuboid is a light exit face 13. The cuboid is provided with a vertically through refraction hole 10 which is positioned behind the 180-degree semicircular frustum, one or more vertically through total reflection holes 12 are respectively arranged between the refraction hole and the left and right chamfered surfaces, the hole wall of each total reflection hole is defined by a plurality of straight cylindrical surfaces, and one of the straight cylindrical surfaces is a total reflection surface, such as 12-1, 12-2, 12-3, 12-4, 12-5 and 12-6. The term "straight cylindrical surface" as used herein means a cylindrical surface perpendicular to the top surface (or bottom surface) of the polyhedron, and is defined as a surface formed by moving a straight line perpendicular to the top surface (or bottom surface) of the polyhedron in parallel along a straight line or a curved line on the top surface (or bottom surface). When the curve is fixed, the formed cylindrical surface is a plane cylindrical surface, and when the curve is fixed, the formed cylindrical surface is a curved surface cylindrical surface. The horizontal cross-sectional shape of the straight cylindrical surface is substantially the same reflecting the shape of a fixed line or a fixed curve.

The surface shape and the arrangement direction of the total reflection surface on each total reflection hole are the surface shape and the arrangement direction which can enable the light ray which is intersected with the axis of the 180-degree frustum and horizontally enters to be totally reflected and the reflected light ray to generally face backwards. The general direction towards the rear includes a direction which is directly towards the rear and a direction which is inclined in a certain angle range towards the left or the right relative to the direction, so as to meet various design requirements, and when the direction is the direction which is directly towards the rear, the total reflection holes mainly play a role of collimation.

The surface type of the concave curved surface is a surface type which can enable all the light rays entering the polyhedron through the convex curved surface to be projected on the concave curved surface and to be totally reflected, and the reflected light rays are positioned on a horizontal plane. The term "concave" refers to a bottom surface of the polyhedron, i.e., a concave surface toward the inside of a solid body, and does not limit the surface-type concavity and convexity. As shown in fig. 6, the surface profile of the concave curved surface itself is slightly convex toward the outside of the solid if the conical surface defined between the center point and the circumferential edge of the circumference is taken as a reference.

When the LED lens is used, the light emitting surface of the LED faces the light incident surface and keeps a certain distance with the light incident surface, most of light emitted by the LED is emitted to the light incident surface, the light emitted by the LED is collected through the matching of the light incident surface and the concave curved surface, and the light is transmitted in the lens at a certain angle. Ideally, by matching the light incident surface with the concave curved surface, all the refracted light rays are just uniformly projected onto the whole inner surface of the concave curved surface, and then are totally reflected by the concave curved surface to form light rays which are transmitted along a horizontal plane and radiate around the axis of the 180-degree half-cone frustum as the center. In general, the ideal situation can be basically realized by matching and designing the surface types of the light incidence surface and the concave curved surface.

Some parameters to be considered in the matching design further include the area of the light incident surface, the size of the LED light emitting surface, the distance between the LED and the light incident surface, the height of the polyhedron, and the like.

On the plane shown in fig. 7, the light totally reflected by the concave curved surface is collimated and transmitted forwards or backwards.

In the whole space, the concave curved surface collects almost all the light rays emitted from the convex curved surface and totally reflects the light rays, the totally reflected light rays are transmitted along a horizontal plane, the transmission direction is vertically intersected with the axis of the 180-degree half-conical frustum and is uniformly distributed around the axis in a radial mode, wherein half of the light rays positioned in the backward 180-degree angle range are directly transmitted in the polyhedron, and the other half of the light rays positioned in the forward 180-degree angle range of the reflected light rays are totally reflected by conical surfaces 9 (two conical surfaces are totally reflecting surfaces, and the included angle between the two conical surfaces is 90 degrees on the longitudinal section of the axis) of the 180-degree half-conical frustum II and the conical surface III and then are converted into the reflected light rays emitted to the backward 180-degree angle range. Therefore, after half of the light rays are totally reflected by the two conical surfaces, all the light rays are horizontally emitted to the rear 180-degree range and are uniformly distributed in the 180-degree range.

As shown in fig. 11, the light rays horizontally emitted to the rear 180 degrees are mainly divided into three parts and collected respectively, and the light rays with a part of angles are collected through the refraction holes, and according to the different surface types of the refraction holes, the light rays passing through the refraction holes are collimated or spread in the lens at a certain angle, and mainly depending on the surface types of the straight cylindrical surfaces surrounding the refraction holes, the surface types are different, and the light rays emitted from the refraction holes also have different angles in the lens; the other part of light is collected by the total reflection surface of the total reflection hole; and the rest part of light is collected by the chamfer surface, and the total reflection surface of the total reflection hole and the surface shape of the chamfer surface are both surface shapes which can ensure that the received light is totally reflected and the reflected light is directly emitted backwards. The chamfer surface is a curved surface cylindrical surface slightly convex towards the outside of the solid body. The total reflection surface of the total reflection hole on the left side or the right side is similar to the bending direction of the chamfer surface, for example, the bending direction of the left side is towards the left front, and the bending direction of the rear side is towards the right front. The LED light rays passing through the light ray incidence surface, the concave curved surface and the two conical surfaces are collected and redistributed again by the refraction hole, the total reflection surface of the total reflection hole and the chamfer surface.

The other cylindrical surfaces except the total reflection surface in the straight cylindrical surface which is enclosed into the total reflection hole mainly aim at forming the total reflection hole, and can be a single curved cylindrical surface or a combined cylindrical surface formed by sequentially connecting a plurality of cylindrical surfaces, and the combined cylindrical surface can be composed of a curved cylindrical surface and/or a plane cylindrical surface. The remaining cylinders in the embodiments of the present invention are two planar cylinders that intersect at an angle, which is the simplest configuration of the aperture.

The zigzag holes can be cylindrical holes or elliptic cylindrical holes, or holes formed by surrounding a plurality of straight cylindrical surfaces, and correspondingly, the straight cylindrical surfaces forming the zigzag holes are curved cylindrical surfaces or plane cylindrical surfaces.

As shown in the attached drawing, the hole wall of the zigzag hole can be formed by four straight cylindrical surfaces, namely a front cylindrical surface and a rear cylindrical surface, wherein the front cylindrical surface is a cylindrical surface with a concave middle part, the rear cylindrical surface is a plane extending from left to right or a cylindrical surface with a convex middle part, and the left cylindrical surface and the right cylindrical surface are planes extending from front to back.

The horizontal section of the curved surface cylindrical surface can be a circular arc or a parabola or other free curves.

The number of the total reflection holes at the left or right of the refraction holes is different in different embodiments shown in the figures, and can be 1-3. In fact, since the total reflection structure of the optical refraction is changeable, the total reflection holes of the invention can be set to a proper number according to the size (mainly the left and right width) of a single lens, and more can be set. Theoretically, a single lens of the present invention can achieve uniform light emission from 0mm to an infinite length, that is, theoretically, the left and right width of the lens may be an infinite width, and certainly, the wider the width, the more total reflection holes need to be provided. Further, the width of the left and right sides may be equal or different with a plane extending in the front-rear direction passing through the axis of the 180-degree half truncated cone as a boundary, and the wider side is generally required to be provided with a large number of total reflection holes.

In the illustrated embodiment, the left and right width of the lens can reach 60mm, and a single LED can be matched with the lens to easily realize a uniform linear light emitting effect of about 60mm and meeting the requirement on brightness.

The refraction hole is preferably in a left-right symmetrical structure, and a symmetrical central plane passes through the axis of the 180-degree semicircular frustum. In this case, all the total reflection holes may be distributed in a left-right symmetrical manner or in an asymmetrical manner.

As a preferred technical scheme, all the total reflection holes are distributed in a bilateral symmetry mode, and a symmetry center plane passes through the axis of the 180-degree semicircular frustum. When the total reflection holes are distributed in a left-right asymmetrical manner, the total reflection holes on the left side and the right side may be opposite or unequal in number, when the total reflection holes are unequal in number, the side with the greater number preferably includes total reflection holes which are bilaterally symmetrical to all the total reflection holes on the side with the lesser number, and the rest are other total reflection holes which have no bilateral symmetrical relationship with the total reflection holes.

In a further aspect, the polyhedron is in a left-right symmetrical structure, and the central plane of symmetry passes through the axis of the 180-degree half-truncated cone. Namely, the folding holes are in a bilateral symmetry structure, and the chamfer surfaces and the total reflection holes are arranged in bilateral symmetry.

The lens has more optical refraction and total reflection structures, collects, collimates or diffuses and redistributes LED light rays for multiple times through different structures, can uniformly distribute the LED light rays in a Lambert luminous mode to realize a uniform linear visual effect, and has the light energy utilization rate of over 85 percent which is far higher than that of a light guide technology.

The main body material of the polyhedron can be transparent materials such as glass, PC or PMMA, and the outer surface of the polyhedron is provided with a coating except for a light incident surface and a light emergent surface.

The light ray emergent surface is a plane or any curved surface, different patterns or microstructures can be arranged on the light distribution control device to achieve the purpose of controlling the light distribution of emergent light.

As a more ideal case, as shown in fig. 5, the axis of the 180-degree half-conical frustum is taken as a common axis, the light incident surface of the folded hole (according to the designed light path of the present application, the leftmost boundary point and the rightmost boundary point of the folded hole are taken as boundaries, and the straight cylindrical surface surrounding the folded hole is divided into a front part and a rear part, the part generally located in the front is a light receiving surface, which may be called as a light incident surface, the total reflection surface of the total reflection hole and the sharp angle region (such as the region sandwiched by two adjacent dotted lines in fig. 5) corresponding to each of the chamfered surface are preferably consecutive (i.e. they are next to each other at the sharp angle, there is no space), and the sharp angle region formed by sequentially splicing them is just 180 degrees. Therefore, light rays horizontally emitted to the rear 180-degree range can be collected by one of the total reflection surfaces and the chamfer surfaces of the refraction hole and the total reflection hole without omission.

Of course, there may be some overlap or space between the sharp corner regions corresponding to each of the three structures. When there is overlap, the light corresponding to the overlap region can only be irradiated on one of the three structures, which is equivalent to shielding the corresponding part of the other structure in an overlapping relationship with the structure, but the lighting effect of the lens is not affected as long as the overlap part is small. When the interval exists, part of light rays are not effectively collected and controlled by any one of the three structures, and the light rays can be diffused through the rest of the cylindrical surfaces of the total reflection holes, so that continuous lighting is achieved.

In a further preferred embodiment, in the front-rear direction, a rear one of the light incident surface of the folded hole, the total reflection surface of each total reflection hole, and each chamfered surface does not block a front one of the two adjacent surfaces.

In fact, it is ideal that the lamp is just not shielded, and the slight shielding only reduces the energy utilization rate to a certain extent, but does not affect the lighting effect, and still conforms to the concept of the invention.

The invention also discloses an LED line light source, which comprises one or more LED line light source units as shown in figures 4-12 and 15, wherein each LED line light source unit comprises an LED and any one of the LED total reflection lenses, the LED is arranged above the light incidence surface of the corresponding LED total reflection lens, the light emitting surface of the LED faces the light incidence surface, and when the number of the LED line light source units is multiple, the LED total reflection lenses are arranged in sequence from left to right as shown in figure 15. Two adjacent lenses may or may not be in contact with each other, and may be specifically set according to the line light emitting effect to be achieved.

Theoretically, uniform light emission of 0mm to an infinite length can also be achieved by a plurality of the lens combinations. FIG. 15 is one embodiment of the combined LED line light source of the present invention. For the situation that a single LED is matched with the lens to easily realize the uniform linear effect of about 60mm, a linear light source with the length of 300mm only needs 5 LEDs matched with 5 lenses.

The LED line light source can realize the linear light emitting effect of longer length and uniform light emission by using fewer LEDs.

The upper and lower, left and right, front and back, vertical and horizontal in the invention are defined in a space dimension, and the purpose is to express the relative position relation of corresponding structures, but not to limit the absolute position.

Claims

1. An LED total reflection lens, characterized in that: the polyhedron is an integral polyhedron, the outline of the main body of the polyhedron is formed by combining a cuboid and an upper 180-degree semicircular frustum which is positioned in the middle of the front surface of the cuboid and has the same size and the completely-fitted lower bottom surface, the longitudinal plane of the 180-degree semicircular frustum is fitted with the front surface of the cuboid, the left side and the right side of the longitudinal plane do not exceed the front surface of the cuboid, the upper bottom surfaces of the upper 180-degree semicircular frustum and the lower bottom surface of the 180-degree semicircular frustum are respectively flush with the top surface and the bottom surface of the cuboid and respectively form the top surface and the bottom surface of the polyhedron together, the plain line of the 180-degree semicircular frustum forms a 45-degree angle with the lower bottom surface, the edge parts of two original chamfer surfaces of the left front side and the right front side of the cuboid are arranged into chamfer surfaces which are curved cylindrical surfaces vertical to the top surface, and the chamfer surfaces are total reflection surfaces, the light source comprises a polyhedron, wherein a circular area, which takes the center of the upper bottom surface of the corresponding 180-degree half-cone frustum as the center of a circle, on the top surface of the polyhedron is set as a light incident surface, the incident surface is a plane or a rotationally symmetric convex curved surface, a circular area, which takes the center of the upper bottom surface of the corresponding 180-degree half-cone frustum as the center of a circle and takes the radius of the upper bottom surface as the radius, on the bottom surface of the polyhedron is set as a rotationally symmetric concave curved surface with a concave central point, the concave curved surface is a total reflection surface, the back surface of the cuboid is a light emergent surface, the cuboid is provided with vertically through refraction holes, the refraction holes are positioned at the back of the 180-degree half-cone frustum, one or more vertically through total reflection holes are respectively arranged between the refraction holes and the left and right chamfer surfaces, the hole walls of the total reflection holes are surrounded by a plurality of straight cylindrical surfaces, and one of the straight cylindrical surfaces is a total reflection surface.

2. The LED total reflection lens according to claim 1, wherein: the surface type of the concave curved surface is a surface type which can make the light rays entering the polyhedron through the convex curved surface totally reflect on the concave curved surface and make the reflected light rays be in a horizontal plane.

3. The LED total reflection lens according to claim 2, wherein: the other cylindrical surfaces except the total reflection surface in the straight cylindrical surface which surrounds the total reflection hole are single curved cylindrical surfaces or combined cylindrical surfaces formed by sequentially connecting a plurality of cylindrical surfaces, and the combined cylindrical surfaces consist of curved cylindrical surfaces and/or plane cylindrical surfaces; the folded hole is a cylindrical hole, an elliptic cylindrical hole or a hole formed by a plurality of straight cylindrical surfaces in a surrounding manner, and when the folded hole is a hole formed by a plurality of straight cylindrical surfaces in a surrounding manner, the straight cylindrical surface forming the folded hole is a curved cylindrical surface or a plane cylindrical surface.

4. The LED total reflection lens according to claim 3, wherein: the hole wall of the folded hole is formed by four straight cylindrical surfaces, namely a front cylindrical surface, a rear cylindrical surface and a left cylindrical surface, a rear cylindrical surface and a right cylindrical surface, wherein the front cylindrical surface is a cylindrical surface with the middle part concave backwards, the rear cylindrical surface is a plane extending leftwards and rightwards or a cylindrical surface with the middle part convex forwards, and the left cylindrical surface and the right cylindrical surface are planes extending forwards and backwards.

5. The LED total reflection lens according to claim 3, wherein: the horizontal section of the curved surface cylindrical surface is in the shape of a circular arc or a parabola.

6. The LED total reflection lens according to claim 3, wherein: the folding holes are in a bilateral symmetry structure, all the total reflection holes are distributed in a bilateral symmetry mode or in an asymmetric mode, when the folding holes are distributed in an asymmetric mode, the total reflection holes in the left side and the right side are opposite or not in number, when the total reflection holes in the left side and the right side are not in number, the side with the larger number contains the total reflection holes which are in bilateral symmetry with all the total reflection holes in the side with the smaller number, and the bilateral symmetry center plane passes through the axis of the 180-degree semicircular frustum.

7. The LED total reflection lens according to claim 6, wherein: the polyhedron is of a bilateral symmetry structure, and a symmetry center plane passes through the axis of the 180-degree semicircular frustum.

8. The LED total reflection lens as claimed in claim 1, 2, 3, 4, 5, 6 or 7, wherein: the main body material is glass, PC or PMMA, the light ray emergent surface is a plane or a curved surface, and patterns or microstructures are arranged on the light ray emergent surface.

9. The LED total reflection lens according to claim 8, wherein: and by taking the axis of the 180-degree semicircular frustum as a common axis, sharp angle regions corresponding to the light incident surface of the folding hole, the total reflection surface of the total reflection hole and the chamfer surface are sequentially continuous, and the sharp angle of the sharp angle region formed by sequentially splicing the light incident surface of the folding hole, the total reflection surface of the total reflection hole and the chamfer surface is 180 degrees.

10. An LED line light source, its characterized in that: the LED line light source comprises one or more LED line light source units, each LED line light source unit comprises an LED and an LED total reflection lens according to claim 1, 2, 3, 4, 5, 6, 7, 8 or 9, the LED is arranged above the light incidence surface of the corresponding LED total reflection lens, the light emitting surface of the LED faces the light incidence surface, and when the LED line light source units are multiple, the LED total reflection lenses are sequentially arranged from left to right.