CN117889379A

CN117889379A - Light emitting device and vehicle lamp

Info

Publication number: CN117889379A
Application number: CN202211232568.7A
Authority: CN
Inventors: 请求不公布姓名
Original assignee: Jiangsu Zero Image Photonics Technology Co ltd
Current assignee: Jiangsu Zero Image Photonics Technology Co ltd
Priority date: 2022-10-08
Filing date: 2022-10-08
Publication date: 2024-04-16

Abstract

The light-emitting device comprises a light source and a light reflecting cup, wherein the light reflecting cup extends along the A direction in an congruent manner, and the light reflecting cup comprises two opposite A1 reflecting surfaces and an A2 reflecting surface; the direction B is orthogonal to the direction A, and the width of the light outlet in the direction B is B _out The width of the light inlet in the direction B is B _in The distance from the light inlet to the light outlet is h, wherein b _out >b _in And b _in +b _out <2h. A lens is also included for projecting and imaging the light distribution of its focal plane into the far field. The lens also comprises a shaping reflecting surface which is positioned between the reflecting cup and the lens light path and extends along the A direction in a congruent manner, wherein the first end of the shaping reflecting surface is close to the light outlet of the reflecting cup, and the second end of the shaping reflecting surface extends towards the lens direction. The light source can emit light in the direction B by using the reflecting cup, and the light emitting area of the virtual reflecting cup formed by the shaping reflecting surface can be expanded in the direction B, so that the light distribution with the expanded area in the direction B and the illumination gradient can be formed after far-field imaging projection by the lens.

Description

Light emitting device and vehicle lamp

Technical Field

The present invention relates to the field of illumination, and more particularly, to a light emitting device and a vehicle lamp using the same.

Background

In the automotive lighting field, automotive headlamps are most strictly required, and both the lighting range and the illuminance of the headlamps have strict requirements of regulations. A schematic structural diagram of a conventional automotive headlamp is shown in fig. 1. Light 121 emitted by the light source 101 is incident on the light reflecting surface 102, reflected and converged, and forms a light band at the converging position, the cross section position of the light band is shown as 121a in fig. 1, and the light band is perpendicular to the drawing surface in fig. 1. The cutoff line diaphragm 104 is located at the convergence focus 121a and blocks a part of the light to form a cutoff line. The light passing through the converging focal point 121a is incident on the lens 103, and the lens 103 can image the light distribution of the plane of the cut-off line stop 104 (i.e., the plane of the converging focal point) to the far field. Thus, the light band at the converging focus 121a forms a light band in the far field, and the edge of the far field light band has a clear cut-off line due to the cut-off line diaphragm 104, so as to meet the requirements of regulations.

The problem with the current approach is that the light source typically uses LED light sources, which are all-angle light emitting, so that there must be light rays directly exiting the reflective surface, such as ray 123 shown in the figure, which results in a decrease in system efficiency.

Disclosure of Invention

In order to solve the problem of low efficiency of the current car lamp scheme, the invention provides a light-emitting device, which comprises a light source, a light-reflecting cup and a light-reflecting device, wherein the light-reflecting cup extends along the A direction in an congruent manner, the light-reflecting cup comprises a light inlet and a light outlet which are opposite, and two opposite A1 reflecting surfaces and A2 reflecting surfaces are arranged between the light inlet and the light outlet; the direction B is orthogonal to the direction A, and the width of the light outlet in the direction B is B _out The width of the light inlet in the direction B is B _in The distance from the light inlet to the light outlet is h, wherein b _out >b _in And b _in +b _out <2h，The light emitted by the light source is incident on the light reflecting cup from the light inlet of the light reflecting cup, part of the light passes through the light reflecting cup and directly exits from the light outlet, and the rest of the light is incident on and reflected by the A1 reflecting surface or the A2 reflecting surface of the light reflecting cup and exits from the light outlet; the lens is an imaging lens and is used for projecting and imaging the light distribution of the focal plane of the lens to a far field, and the light emitted from the light outlet of the reflecting cup is incident on the lens and is projected to the far field by the lens; the lens has in the B directionEffective width is L _B The focal length of the lens is F->The lens also comprises a shaping reflecting surface which is positioned between the reflecting cup and the lens light path and extends along the A direction in a congruent manner, wherein the first end of the shaping reflecting surface is close to the light outlet of the reflecting cup, and the second end of the shaping reflecting surface extends towards the lens direction.

In the above light emitting device, preferably, the distance from the second end of the shaping reflective surface to the optical axis of the reflector cup is not smaller than the distance from the first end to the optical axis of the reflector cup.

In the above light emitting device, preferably, the sectional lines of the A1 reflecting surface and the A2 reflecting surface on the cross section perpendicular to the a direction are the A1 sectional line and the A2 sectional line, respectively, the A1 sectional line is at least partially a parabola, the focal point of the parabola coincides with the end point of the A2 sectional line at the light inlet, and the part of the axis of the overfocal point of the parabola on the light reflecting cup side is inclined away from the A1 sectional line with respect to the connecting line of the light inlet and the light outlet center; or,

the A1 section line is at least partially parabolic, and the A2 section line is straight; the end point of the A1 intercept line at the light inlet is M point, the symmetry point of the M point about the A2 intercept line is N point, the focus of the parabola of the A1 intercept line coincides with the N point, and the part of the axis of the overfocus of the parabola on one side of the reflecting cup is inclined relative to the connecting line of the light inlet and the light outlet center in the direction far away from the A1 intercept line.

In the above light emitting device, it is preferable that the light emitting device further includes a B1 reflecting surface and a B2 reflecting surface extending in the B direction congruently, and the A1 reflecting surface, the B1 reflecting surface, the A2 reflecting surface, and the B2 reflecting surface are connected to form a reflecting channel together, and light emitted from the light source is incident from a light entrance of the reflecting channel, propagates through the reflecting channel, and is emitted from a light exit of the reflecting channel.

In the above light emitting device, preferably, the reflecting channel is a transparent material entity, the A1 reflecting surface, the B1 reflecting surface, the A2 reflecting surface, and the B2 reflecting surface are smooth surfaces of the side surfaces of the transparent material entity, and after light emitted from the light source enters the reflecting channel from the light inlet of the reflecting channel, part of the light enters the smooth surfaces of the side surfaces of the transparent material entity and is totally reflected.

In the above light emitting device, preferably, the first end of the shaping reflection surface is closely attached to the light outlet of the reflection channel.

In the above light emitting device, it is preferable that the center of the light outlet of the reflector cup is not located on the center line of the lens in the B direction, and the shaping reflection surface is located on a side of the reflector cup away from the center line of the lens in the B direction.

In the above-described light emitting device, it is preferable that the reflecting cup and the shaping reflecting surface deflect in the B direction so that the optical axis of the outgoing light passes through the center of the lens.

In the above light emitting device, preferably, the sectional lines of the A1 reflecting surface, the A2 reflecting surface and the shaping reflecting surface on the section perpendicular to the a direction are the A1 sectional line, the A2 sectional line and the shaping sectional line, respectively, the first end of the shaping sectional line is close to the end point of the A1 sectional line at the light outlet, the line between the second end of the shaping sectional line and the end point of the A2 sectional line at the light outlet and the line between the light outlet of the reflecting cup and the center of the light inlet has an angle alpha,

The invention also provides a car lamp, which comprises the light-emitting device, a shell and a mask, wherein the light-emitting device is fixed in the shell, the mask seals the shell, and light emitted by the light-emitting device is emitted through the mask.

The light-reflecting cup can limit the light-emitting angle of the light source in the B direction, and the virtual light-reflecting cup formed by the shaping reflecting surface can expand the light-emitting area in the B direction, so that the light distribution which expands the area in the B direction and forms the illumination gradient can be formed after far-field imaging projection through the lens, and the light-reflecting cup is particularly suitable for car lamp application with both far and near light.

Drawings

FIG. 1 is a schematic view showing a structure of a lamp in the prior art;

fig. 2a, 2b show schematic views of a first embodiment of the invention in two directions, respectively;

FIG. 2c is a schematic diagram showing the operation principle of the reflector cup of the present invention;

FIG. 2d shows the far field light distribution with the shaped reflective surface removed in a first embodiment of the invention;

FIG. 2e shows the far field light distribution after considering the effect of the shaped reflecting surface in the first embodiment of the present invention;

FIG. 2f is a schematic diagram illustrating the working principle of the shaping reflective surface according to the first embodiment of the present invention;

FIG. 3 shows a schematic diagram of another embodiment of the present invention;

FIGS. 4a and 4b are schematic diagrams showing the operation of another embodiment of the present invention and another reflector cup, respectively;

FIG. 5 is a schematic view showing the operation principle of a reflector cup according to another embodiment of the present invention;

FIG. 6a is a schematic diagram showing the operation of a shaping reflective surface according to another preferred embodiment of the present invention;

FIG. 6b shows a schematic diagram of far field light distribution of the embodiment of FIG. 6 a;

FIGS. 7a and 7b show a schematic diagram of another embodiment of the present invention and a far field light distribution diagram thereof, respectively;

FIG. 8 shows a schematic diagram of another embodiment of the present invention;

figures 9a, 9b show schematic views in two directions, respectively, of another embodiment of the invention;

FIG. 9c shows a perspective view of the reflective channel in the embodiment of FIG. 9 a;

FIGS. 10a and 10b show schematic views in two directions, respectively, of another embodiment of the present invention;

FIG. 10c shows a far field light distribution schematic of the embodiment shown in FIG. 10 a;

FIG. 11a shows a schematic structural view of another embodiment of the present invention;

FIG. 11b shows a schematic view of the stop-line aperture in the embodiment shown in FIG. 11 a;

FIG. 11c shows a far field light distribution schematic using the stop line stop of FIG. 11 b;

FIG. 11d shows a schematic view of another stop-line aperture in the embodiment shown in FIG. 11 a;

Fig. 11e shows a far field light distribution schematic using the cut-off line stop of fig. 11 d.

Detailed Description

The present invention proposes a lighting device, the front and top views of which are shown in fig. 2a and 2b, respectively. The light-emitting device comprises a light source 201 and a reflecting cup 202, wherein the reflecting cup 202 extends along the A direction in a congruent manner, the reflecting cup 202 comprises a light inlet 202c and a light outlet 202d which are opposite, and two opposite A1 reflecting surfaces 202A1 and A2 reflecting surfaces 202A2 are arranged between the light inlet 202c and the light outlet 202 d. The direction B is orthogonal to the direction a, as shown, with the direction a being inward perpendicular to the page in fig. 2a, the direction B being upward, and the direction a being upward in fig. 2B, the direction B being outward perpendicular to the page. The width of the light outlet 202d in the B direction is B _out The width of the light inlet 202c in the B direction is B _in The distance from the light inlet to the light outlet is h, wherein b _out >b _in And b _in +b _out <2h，Light emitted from the light source 201 enters the reflector cup 202 from the light inlet 202c of the reflector cup 202, a part of the light passes through the reflector cup 202 and directly exits from the light outlet (for example, light 225 in the figure), and the rest of the light enters the A1 reflecting surface or the A2 reflecting surface of the reflector cup and is reflected by the A1 reflecting surface or the A2 reflecting surface and exits from the light outlet 202 d. The light emitting device further includes a lens 203, the lens 203 being an imaging lens for projecting and imaging the light distribution of its focal plane to the far field, the light exiting from the light outlet 202d of the reflector being incident on the lens and projected by it to the far field. The effective width of the lens 203 in the B direction is L _B The focal length of the lens 203 is F,the light-emitting device further comprises a shaping reflecting surface 204 which is positioned between the light paths of the reflecting cup 202 and the lens 203 and extends congruently along the A direction, wherein the first end of the shaping reflecting surface 204 is close to the light outlet 202d of the reflecting cup, and the second end of the shaping reflecting surface extends towards the lens 203.

In this embodiment, as shown in fig. 2a, the reflective cup 202 extends congruently in the a direction, the reflective cup 202 limits the propagation direction of the light in the B direction, and the light incident on the A1 reflective surface 202A1 and the A2 reflective surface 202A2 is reflected by the two reflective surfaces, changed in direction, and then exits from the light outlet 202 d. The schematic view of the light path of the reflector cup 202 in the section of fig. 2a is shown in fig. 2c, and the function of the reflector cup 202 is explained in detail with reference to fig. 2 c.

In this embodiment, the light source 201 is an LED, and the LED emits light at a full angle, so that the light source 201 emits light at a full angle upward in fig. 2c, and the emission half angle is 90 degrees. The light is divided into two parts, the light with a small angle can directly exit from the light outlet 202d, and the light with a large angle can enter the A1 reflecting surface 202A1 or the A2 reflecting surface 202A2 and be reflected by the reflecting surface and then exit from the light outlet 202 d. In order to reflect the light with a large angle toward the light outlet 202d, the width of the light outlet must be larger than the width of the light inlet, i.e. b _out >b _in . In addition, the reference line 251 is formed between the end 202a21 of the light entrance and the end 202a12 of the light exit, which connects the end 202A2 of the A2 reflecting surface and the end 202A1 of the A1 reflecting surface, and this line represents the light emitted from the light source 201 and having the largest angle that can be directly emitted from the light exit 202d without being reflected by the reflecting surface. According to the geometric principle, the tangent of the inclination of the reference line 251 is equal toThat is, as long as b is satisfied _in +b _out <2h, it is possible to realize that the maximum angle of the light emitted from the light source 201 and directly emitted from the light outlet 202d without being reflected by the reflecting surface is less than 45 degrees. Meanwhile, the A1 reflecting surface and the A2 reflecting surface are reasonably designed, and the emergent angle of the large-angle light reflected by the A1 reflecting surface and the A2 reflecting surface can be smaller than 45 degrees. Thus, the light emitted by the light source 201 can realize the compression of the emergent angle in the direction B under the action of the reflecting cup 202, and the emergent angle after compression is less than or equal to 45 degrees. There are various implementations of specific designs for the A1 and A2 reflective surfaces, which are described in detail below.

In summary, by reasonable design of the A1 reflecting surface and the A2 reflecting surface, the light emitted from the light source 201 is directly emitted from the light outlet 202d The light emitted by the light emitting device can be reflected by the A1 reflecting surface or the A2 reflecting surface and then emitted from the light outlet 202dCompressing to a certain angle smaller than 45 degrees. According to the law of conservation of the etendue,wherein the incident angle is 90 degrees of the half angle of the LED light source, thus can obtain

The light emitting device further includes a lens 203, the lens 203 being an imaging lens for projecting and imaging the light distribution of its focal plane to the far field, the light exiting from the light outlet 202d of the reflector being incident on the lens and projected by it to the far field. The effective width of the lens 203 in the B direction is L _B The focal length of the lens 203 is F, so that the half angle of the light received by the lens 203 in the B direction is equal toSince the angle of the light emitted from the light-reflecting cup light-emitting port 202d is limited to half angle +.>Inside, andtherefore, most of the light emitted from the light outlet 202d of the reflector can be incident into the effective aperture of the lens 203, so that the light can be efficiently projected to the far field by the lens 203, and the problem of leakage light in the prior art is avoided. For example, the light ray 221 is reflected once by the A2 reflecting surface 202A2, then enters the lens 203 and is projected to the far field forming light ray 222, and the light ray 225 is directly emitted from the light outlet 202d without being reflected by the A1 reflecting surface or the A2 reflecting surface, then enters the lens 203 and is projected to the far field forming light ray 226.

As shown in fig. 2b, the light emitted from the light source 201 by the reflector cup 202 is not compressed in the direction a, so that the light distribution of the light outlet 202d of the reflector cup is wider in the direction a. That is, at the reflector cup light outlet 202d, the light exhibits a light distribution that is wide in the a-direction and narrow in the B-direction (because it is limited in the B-direction by the A1 and A2 reflective surfaces), and this light distribution, after imaging by the lens 203, is projected to the far field to form a far-field light distribution 262 that is wide in the a-direction and narrow in the B-direction, as shown in fig. 2 d.

The light-emitting device further comprises a shaping reflecting surface 204 which is positioned between the light paths of the reflecting cup 202 and the lens 203 and extends congruently along the A direction, wherein the first end of the shaping reflecting surface 204 is close to the light outlet 202d of the reflecting cup, and the second end of the shaping reflecting surface extends towards the lens 203. Some of the light exiting the reflector cup light outlet 202d is incident on the shaped reflective surface 204, reflected by the shaped reflective surface 204 to change direction, and finally incident on the lens 203 and projected by the lens to the far field. For example, in fig. 2a, the light ray 223 is emitted from the light outlet 202d, then enters the shaping reflection surface 204, is reflected by the shaping reflection surface, enters the lens 203, and is projected by the lens to the far-field forming light ray 224. To deduce the light spot formed by the light in the far field, the light 223 reflected by the shaping reflecting surface 204 is reversely pushed along a straight line to obtain a virtual light 223', the light 223 can be equivalently regarded as a virtual light 223' emitted from the light outlet of the virtual reflecting cup 202', that is, the light 224 projected to the far field through the lens 203 can be regarded as a virtual reflecting cup 202' emitted, and the virtual reflecting cup 202' is a mirror image of the reflecting cup 202 on the shaping reflecting surface 204. Since the first end of the shaping reflective surface 204 is close to the light outlet 202d of the reflector, the virtual reflector 202' and the physical reflector 202 are close to each other; if it is preferable that the first end of the shaping reflective surface 204 is closely attached to the light outlet 202d of the reflector, the light outlet of the virtual reflector 202' is connected to the light outlet of the physical reflector 202, so that a larger light emitting surface is equivalently formed, that is, the light outlet of the reflector 202 extends by a length twice in the +b direction, and the light energy extending out is the light energy incident on the shaping reflective surface 204 and exiting from the physical reflector 202.

Therefore, the far field light distribution at this time should be extended in the-B direction on the basis of the light distribution of fig. 2d, as shown in fig. 2 e. To avoid misunderstanding, it is worth specifically describing that the light distribution shown in fig. 2d is the light distribution when the shaping reflective surface 204 is not included in the present embodiment, and the far-field light spot 262 is formed by imaging and projecting the light emitted from the light outlet 202d of the reflector cup through the lens 203, and the light spot 262 is substantially uniform. The light distribution shown in fig. 2e is the light distribution when the shaping reflective surface 204 is included in the present embodiment, it can be seen that, of the light emitted from the light outlet 202d of the reflective cup, the light (for example, the light rays 221 and 225) which is not incident on the shaping reflective surface 204 but directly incident on the lens 203 is imaged and projected by the lens 203 to the far field forming light spot 262', and the light (for example, the light ray 223) which is incident on the shaping reflective surface 204 and reflected by the shaping reflective surface and then incident on the lens 203 is imaged and projected by the lens 203 to the far field forming light spot 264. As described above, the light spot 264 can be equivalently regarded as that the light emitted by the virtual reflecting cup 202' is directly imaged and projected to the far field by the lens 203, and since the virtual reflecting cup is close to or even connected with the physical reflecting cup, the light spot 264 formed by the virtual reflecting cup 202' is also close to or even connected with the light spot formed by the physical reflecting cup 202, and the light spot 264 is equivalent to the extension of the light spot 262' formed by the light outlet of the physical reflecting cup 202 in the-B direction.

The intensity of the illuminance is represented by the degree of density of the lattice in fig. 2e, and the denser represents the higher the illuminance. The reason for this light distribution is explained below in connection with fig. 2 f. For convenience of analysis, the light outlet 202d of the reflector is divided into two equal parts in the direction B, a half of the reflector near the shaping reflecting surface 204 is represented by a light-emitting point 271, a half of the reflector far from the shaping reflecting surface is represented by a light-emitting point 272, and a beam of light with a certain angle range (representing the angle range of the light emitted from the light outlet 202 d) is emitted from the light-emitting point 271 and the light-emitting point 272. Of the three light rays 271a, 271b and 271c emitted from the light-emitting point 271, two light rays 271b and 271c are incident on the shaping reflection surface 204, corresponding to two light rays 271b ' and 271c ' emitted from the mirror-image light-emitting point 271 '; meanwhile, only one light ray 272c among the three light rays 272a, 272b, and 272c emitted from the light emitting point 272 is incident on the shaping reflection surface 204, which corresponds to one light ray 272c 'emitted from the mirror image light emitting point 272'. Thus, it will be appreciated that in FIG. 2e 264a of the spots 264 formed by the virtual reflector cup 202 'is a fraction of the energy split from 262a of the spots 262 formed by the physical reflector cup 202, 264b of the spots 264 formed by the virtual reflector cup 202' is a fraction of the energy split from 262b of the spots 262 formed by the physical reflector cup 202, and that the light energy split from spot 264b is greater than spot 264 a. As can be seen from an analysis of fig. 2f, the larger the size of the shaped reflective surface 204, the more its second end extends towards the mirror, the more energy the mirrored light emitting points 271 'and 272' split from the solid light emitting points 271 and 272, and vice versa, and thus the illuminance of the spot 264 can be controlled by controlling the size of the shaped reflective surface. However, as can be appreciated from fig. 2f, the energy of spot 264 is less than half that of spot 262 even though the shaped reflecting surface is infinitely large. Thus, as shown in FIG. 2e, under the action of the shaped reflective surface 204, a light distribution is formed in the far field that expands and tapers in the-B direction. It is noted that in fig. 2e and 2f, the relative brightness values of the light distribution are represented and analyzed in a partitioned manner, which is only for convenience in the representation and analysis, whereas in practice the far-field light distribution may be continuously attenuated in the-B direction.

While the brightness of spot 262a is divided by spot 264a by a small portion under the action of the shaping reflective surface with respect to the brightness of spot 262, the brightness of spot 262a is reduced by a small portion, but considering the increase of the illumination range by a multiple, and the reduction of the brightness at the highest brightness is not large or even not reduced, the light distribution shown in fig. 2e is obviously more suitable for the application occasions such as car lamps which need both near floodlight illumination and far high-brightness illumination, namely, spots 264a, 264b, 262b and 262a are sequentially formed from near to far to illuminate, so that a large illumination range can be generated, and the illumination positions of relatively dark spots are relatively close, and the illumination positions of relatively bright spots are relatively far, so that the formed road illumination is nearly uniform and has a very good illumination effect. On the contrary, if uniform spot illumination is used, the illumination effect is not good and the near light is in a waste state, so that unnecessary energy consumption is formed.

In summary, in the present embodiment, the light emitted from the light source is concentrated at a half angle by the reflector cup 202Within an angle range of>The lens is used for efficiently collecting the light emitted from the light outlet of the reflecting cup and projecting the imaged light to a far field; a mirror image virtual reflecting cup close to the reflecting cup is formed by utilizing a shaping reflecting surface close to a light outlet of the reflecting cup, so that an illumination light field which is gradually weakened in the-B direction and is doubled in area is formed in a far field, and the illumination light field is particularly suitable for simultaneously illuminating near and far application scenes.

A preferred design method for the A1 reflecting surface and the A2 reflecting surface of reflector cup 202 is described below in conjunction with fig. 2 c. As described above, the width b of the light inlet of the reflector cup _in Width b of light outlet _out And the distance h from the light inlet to the light outlet determines that the tangent value of the maximum emergent angle of the directly emergent light is equal toThe surface shapes of the A1 reflecting surface and the A2 reflecting surface of the reflecting cup also need to be designed so that the maximum outgoing angle of the reflected light of the incident large-angle light is limited to a certain extent. Let us take the design of the A1 reflecting surface 202A1 as an example. The sections of the reflective surface A1 and the reflective surface A2 in the cross section perpendicular to the direction a are the section A1 (also denoted by 202A1 in the figure) and the section A2 (also denoted by 202A2 in the figure), respectively, the section A1 202A1 is a parabola whose focal point coincides with the end point 202a21 of the section A2 at the light entrance, and the portion of the axis 252 of the overfocal point of the parabola on the light reflecting cup side is inclined away from the section A1 with respect to the line connecting the centers of the light entrance and the light exit, i.e., is inclined to the right in fig. 2 c. According toThe geometrical principle of the parabola, the light rays 241 and 243 incident on the A1 reflecting surface 202A1 from the parabolic focus 202a21 are reflected by the parabola and then emitted along the direction parallel to the axis of the parabola, so as to form the emitted light rays 242 and 244, respectively. The angle of the reflected light from any other point of the light source 201 that is incident on the same point of incidence is smaller than the angles of the light rays 242 and 244, for example, in fig. 2c, ray 246 is the light emitted from the middle of the light source, which is incident on the same point of incidence as ray 241, and the angle of the reflected light 247 is necessarily smaller than that of ray 242. Therefore, the exit angle of all the light emitted from the light source 201 and incident on the A1 reflecting surface 202A1 is not larger than the axis 252, and thus angle control of the reflected light is achieved. The A2 reflecting surface can be designed on the same principle as the design of the A1 reflecting surface.

Let the included angle between the line 252 of the overfocal point of the parabola (i.e. the A1 cross line of the A1 reflecting surface 202 A1) and the line between the center of the light inlet and the center of the light outlet be K, where K is the maximum exit angle of all the light emitted from the light source 201 and incident on the A1 reflecting surface 202A1 after reflection. Preferably, the method comprises the steps of,i.e. the maximum angle of the light reflected by the A1 reflecting surface, the A2 reflecting surface is equal to the maximum angle of the light directly emitted from the light source, both angles are equal to +.>Thus, the exit angle of all light emitted from the light source 201 after passing through the reflecting cup 202 is controlled to be not more than +.>And (5) corners. And according to the law of conservation of etendue, < +.>

In this embodiment, the reflective cup extends congruently in the a direction, so that the A1 reflective surface and the A2 reflective surface also extend congruently in the a direction, so that the light inlet and the light outlet also extend congruently in the a direction, that is to say the light inlet and the light outlet comprise straight edges extending in the a direction, which has the following advantages:

1. if the light source uses an LED, the light emitting surface of the LED is generally rectangular or square, and has a flat edge, so that the linear edge of the light inlet can be aligned with the edge of the light emitting area of the LED, and the highest efficiency is achieved, and meanwhile, better light emitting uniformity is obtained because no gap (or smaller gap) is provided.

2. Regulations have provided that the light distribution of vehicle lamps is of a light type which is relatively wide in the horizontal direction and relatively narrow in the vertical direction, and that a cut-off extending in the horizontal direction is required to avoid glare to other vehicle occupants, which cut-off is suitably and efficiently realized by means of a straight edge of the light outlet extending in the direction a.

In this embodiment, the second end of the shaping reflective surface 204 extends along the optical axis of the reflector cup in the direction of the lens, i.e., the distance from the second end of the shaping reflective surface to the optical axis of the reflector cup is equal to the distance from the first end to the optical axis of the reflector cup. The mirror image virtual reflecting cup 202' formed in this way is parallel to the solid reflecting cup 202 and is arranged side by side, so that a relatively large equivalent light spot range can be obtained. In another embodiment of the present invention, as shown in FIG. 3, the difference from the embodiment shown in FIG. 2a is that in this embodiment the second end of the shaped reflective surface 304 is farther from the optical axis of the reflector cup 302 than the first end, thus forming a mirrored virtual reflector cup 302' farther from the lens 303. This has the advantage that the presence of the shaped reflecting surface 304 has a small influence on the angle of the light exiting the reflector cup 302, and that the light exiting the reflector cup 302 is incident on the shaped reflecting surface 304 with a relatively small energy, i.e. the light energy separated by the virtual reflector cup 302', which is advantageous for creating a more pronounced illuminance gradient in the far field.

It is preferable that the distance from the second end of the shaping reflecting surface to the optical axis of the reflecting cup is not smaller than the distance from the first end to the optical axis of the reflecting cup. Of course, in practical applications, the fact that the distance from the second end of the shaping reflective surface to the optical axis of the reflector cup is smaller than the distance from the first end to the optical axis of the reflector cup is also present, as will be explained in the next embodiment.

A schematic structural diagram of another embodiment of the present invention is shown in fig. 4 a. In this embodiment, the distance from the second end of the shaping reflective surface 404 to the optical axis of the reflector cup 402 is smaller than the distance from the first end to the optical axis of the reflector cup 402, and the shaping reflective surface 404 is shorter at this time, so as to avoid too much influence on the light emitted by the reflector cup 402, which is used to form an application scene that the illumination area is not required to be large and the illumination is required to be relatively uniform.

The present embodiment is different from the embodiment shown in fig. 2a in that a different structure is used to form the reflecting cup 402, and the schematic optical path of the reflecting cup 402 is shown in fig. 4 b. In the present embodiment, the sectional lines of the A1 reflecting surface 402A1 and the A2 reflecting surface 402A2 in a section perpendicular to the a direction are an A1 sectional line and an A2 sectional line, respectively, the A1 sectional line is parabolic (also denoted by 402A1 in the drawing), and the A2 sectional line is straight (also denoted by 402A2 in the drawing). The end point of the A1 intercept line 402A1 at the light inlet is M point, the symmetry point of the M point with respect to the A2 intercept line 402A2 is N point, the parabolic focus of the A1 intercept line 402A1 coincides with the N point, the axis 452 of the parabolic over focus N point is inclined in the direction away from the A1 intercept line 402A1 relative to the connecting line of the light inlet and the light outlet center at one side of the reflecting cup, i.e. is inclined to the right in fig. 4 b. For ease of analysis, in fig. 4b, solid arrows represent actual light rays, dashed arrows represent specular light rays of the actual light rays, and the reference numerals are added with' symbols to the corresponding solid light rays.

Three rays 440, 444, and 447 from the left end point M of the light source 401 (i.e., the end point of the A1 intercept 402A1 at the light entrance) are observed, which are incident on the A2 intercept 402A2 and reflected, rays 441, 445, 448 being equivalent to the straight propagation of rays 440', 444', 447' exiting at the mirror point N of point M, where rays 441 and 445 are incident on the A1 reflecting surface 402A1. Since the N point is the focal point of the parabola (A1 reflecting surface) 402A1, the rays 441 and 445, after being reflected by the A1 reflecting surface 402a, exit in a direction parallel to the axis 452 of the parabola to form parallel rays 442 and 446, wherein the ray 446 exits directly, the ray 442 enters the plane of the A2 intercept to form ray 443, the angle of exit of the ray 443The same as light 442. Therefore, the light reflected from the M point through the A1 reflecting surface 402a is emitted from the light outlet at a certain angle K. It is easy to deduce that the outgoing angle of the light emitted from any point of the light source after being reflected by the A1 reflecting surface 402A1 is not larger than the K angle. Thus, angle control of the reflected light is achieved. On the other hand, more preferably, the angle between the line from the focal point N of the A1 intercept 402A1 to the end point of the A1 intercept and the line between the light inlet and the center of the light outlet is also equal to K, for example, ray 448, which is not incident on the A1 reflecting surface but directly exits from the upper edge of the A1 reflecting surface, this ray equivalently being the ray 447' emitted from the N point directly exits from the light outlet, and the angle of exit is also equal to K, so that the angle of exit of any directly exiting ray emitted from the light source 401 is equal to or less than K. Thus, similar to the embodiment shown in FIG. 2c, by controlling b _in 、b _out The control of the emergent angle of the reflecting cup 402 to the emergent light can be realized by the external dimensions of h and the like and the reasonable design of the A1 reflecting surface, and the emergent half angle thereof

The preferred design method of the A1 reflecting surface and the A2 reflecting surface of the reflector cup is described by two embodiments shown in fig. 2c and 4b, but other design methods are not listed here, and the invention is within the scope of protection as long as the outer dimensions a, b, h of the reflector cup meet the requirements of the invention. For example, the continuously curved reflective surface as shown in fig. 2c and fig. 4b may have a problem that it is not easy to process, and in actual operation, as shown in fig. 5, a section line of at least one of the A1 reflective surface 502A1 and the A2 reflective surface 502A2 of the reflector cup 502 at the first section may also be formed by splicing multiple sections of fold lines. Taking the A1 reflecting surface 502A1 as an example, a sectional line (also denoted by 502A1 in the figure) on a section perpendicular to the a direction is formed by splicing a plurality of sections of folding lines 502A1a, 502A1b, 502A1c, which is relatively easy to process, and the principle is that the section of the A1 sectional line of the parabola shown in fig. 2c is simulated by the plurality of sections of folding lines, and the end points of the plurality of sections of folding lines 502A1a, 502A1b, 502A1c are all located on the parabola. This, while giving some deviation in the control of the angle of the outgoing light, is acceptable in practice.

In the description of the above embodiments, it can be seen that the shaping reflective surface plays an important role in the implementation principle of the present invention. In the above embodiments, the extension length of the total reflection surface in the lens direction is not limited and described. In another preferred embodiment of the invention, the extension of the shaped reflective surface in the direction of the lens is described in connection with the schematic diagram of fig. 6 a. In this embodiment, the sections of the reflective surface 602A1, the reflective surface 602A2 and the shaping reflective surface 604 of the reflective cup 602 in the cross section perpendicular to the direction a are respectively A1 section line (also denoted by 602 A1), A2 section line (also denoted by 602 A2) and a shaping section line (also denoted by 604), the first end of the shaping section line 604 is close to the end point of the A1 section line 602A1 at the light exit, the line connecting the second end 604a of the shaping section line 604 with the end point 602a22 of the section line 602A2 at the light exit and the line connecting the light exit of the reflective cup 602 with the center of the light entrance is a (identified in the figure),this limits the extension of the second end of the shaped reflective surface in the direction of the lens. A detailed explanation is given below. From the foregoing description of the A1 reflecting surface of the reflector cup, it is known that, by reasonable design, the half angle of the light emitted from the light-emitting surface 602d of the reflector cup 602 can be controlled to be +. >In the mean-in-time, the first time,for example, adjacent rays 642 and 643 from the left end 601a1 of the light source 601, ray 642 directly emerges from just above the upper edge 602a22 of the A2 reflecting surface, ray 642 having an angle of +.>Light 643 just enters the upper edge 602a22 of the A2 reflecting surface and is reflected, and the angle between the reflected light 642 and the optical axis is also +.>That is, the light outlet 602d of the reflector cup 602 can be regarded as a light emitting half angle +.>Is larger in area. In the present embodiment, the half angle of the light emitted from the left end 601a1 of the light source 601 after the other light 641 is reflected by the A2 reflecting surface is +.>It is just incident on and reflected by the second end 604a of the shaped reflective surface and the mirrored light 641 'of the light 641 is equivalently emitted from the light exit of the virtual reflector cup 602'. Since ray 641 is the most angular ray exiting the reflector, and since it is incident on the second end 604a of the shaping reflector, it can be seen by analysis that ray 641 is the rightmost (i.e., + B furthest) ray capable of being incident on the shaping reflector, i.e., the mirrored ray 641 'is the leftmost (i.e., -B furthest) ray from the virtual reflector 602'. If the light outlet 602d of the reflector cup 602 is divided into two parts 602d1 and 602d2 along the direction B, as shown in the figure, none of the light emitted from the part 602d1 can be incident on the shaping reflective surface 604, while the light emitted from the part 602d2 can be incident on the shaping reflective surface 604, that is, the equivalent light can be emitted from the part 602'd2 of the virtual reflector cup 602' (this part of the light is the light emitted from the part 602d2 that is incident on the shaping reflective surface 604), while no light is emitted from the part 602'd1 of the virtual reflector cup 602'. Thus, the light distribution thus formed in the far field is shown in fig. 6 b; wherein, the light emitted from the 602d1 portion of the light outlet of the reflector cup 602 corresponds to the light spot 662a, the light emitted from the 602d2 portion of the light outlet of the reflector cup 602 corresponds to the light spot 662b, and the light emitted from the 602'd2 portion of the light outlet of the virtual reflector cup 602' corresponds to the light spot 664b. The light emitted from the 602'd2 portion of the light exit of the virtual reflector cup 602' is incident on the shaped reflecting surface from the 602d2 portion of the light exit of the virtual reflector cup 602, and obviously has an energy less than half of the total energy of the light emitted from the 602d2 portion, so the light spot 664b The illuminance is less than that of spot 662 b; further, since the light emitted from the light outlet 602d1 of the reflector cup 602 is not affected by the shaped reflecting surface 604, the illuminance of the spot 662a is the same as that of the non-shaped reflecting surface and is not reduced.

In this embodiment, since the length of the second end of the shaping reflective surface 604 extending in the lens direction is limited, the illuminance of the portion 662a of the far-field spot where the far end is irradiated is kept maximum, and an optimal tele effect can be achieved. As can be appreciated from fig. 6a, as the second end 604a of the shaping reflective surface 604 continues to extend in the lens direction (upward in the drawing), the angle α between the line connecting the second end 604a of the shaping stub 604 and the end 602a22 of the A2 stub 602A2 at the light outlet and the line connecting the light outlet of the reflector 602 and the center of the light inlet becomes smaller, the proportion of the light incident on the shaping reflective surface from the light outlet 602d of the reflector increases, the corresponding far-field light spot also gradually increases in the-B direction, and when α becomes smaller to be equal to the angle αIn the same time, part of the light emitted from any position of the light outlet of the reflecting cup is incident on the shaping reflecting surface, and theoretically, the edge illuminance of the far-field light spot in the +B direction can still be kept the maximum, and the size of the far-field light spot in the B direction reaches the maximum. When the second end 604a of the shaping reflective surface 604 extends further in the lens direction, the element is +. >At this time, the far-field light spot is not enlarged any more, and the brightest point of the far-field light spot also starts to weaken. Therefore, preferably,/->At this time, the size and the highest illumination of the far-field light spot reach better balance. The shaping reflective surface does not reduce the angle of the light exiting the reflector cup (still half angle +.>) Due toThe lens can still collect the light emitted from the reflector cup and reflected from the shaping reflective surface with high efficiency.

Of course, in practical applicationThis is also possible because at this point the proportion of light in the ghost cup increases, i.e. the uniformity of the far field spot increases, although the far field spot is no longer increasing.

In another embodiment of the present invention, as shown in fig. 7a, unlike the embodiment shown in fig. 2a, in the B direction, the center 702dc of the light outlet of the reflector cup 702 is not on the center line Bc of the lens 703, and in the B direction, the shaping reflective surface 704 is located on the side of the reflector cup 702 away from the center line Bc of the lens. This has the advantage that far field spots (including spots formed by the light outlet of reflector cup 702 and spots formed by the light outlet of virtual reflector cup 702') are all concentrated on one side with respect to the B-direction centerline Bc, which means that light above horizontal is weak or absent in automotive applications, which can act as anti-glare.

In the embodiment shown in fig. 7a, the reflector cup and the shaped reflecting surface are offset in the +b direction as a whole, which has the advantage that the far field spot is offset in the-B direction for the purpose of reducing/preventing glare; at the same time, in the +b direction, the light emitted by the reflector cup is emitted from the lens (i.e., cannot be incident into the effective aperture of the lens), so that the efficiency is reduced. In order to solve this problem, in another embodiment shown in fig. 8, the reflection channel and the shaping reflection surface are deflected as a whole so that the optical axis of the whole outgoing light passes through the center of the lens, so that the light can be made to be incident as much as possible within the effective aperture of the lens, thereby improving the collection efficiency.

In the foregoing embodiment, the reflector cup includes both the A1 reflecting surface and the A2 reflecting surface extending congruently in the a direction and controlling the light emission angle of the light in the B direction, but not limiting the angle of the light in the a direction. In practical applications, it is also significant to limit the angle or aperture of the outgoing light in the a direction so that it can be fully utilized. Thus, in another embodiment of the present invention, as shown in fig. 9a and 9B, unlike the embodiment shown in fig. 2a and 2B, the light emitting device further includes B1 reflecting surfaces 902B1 and B2 reflecting surfaces 902B2 extending congruently along the B direction, the A1 reflecting surfaces 902A1, B1 reflecting surfaces 902B1, A2 reflecting surfaces 902A2, and B2 reflecting surfaces 902B2 are connected together to form a reflecting channel 902, and light emitted from the light source 901 enters from a light entrance of the reflecting channel and exits from a light exit of the reflecting channel 902 after propagating in the reflecting channel, in addition to the A1 reflecting surfaces 902A1 and A2 reflecting surfaces 902A2 extending congruently along the a direction. The preferred design method of the B1 reflecting surface and the B2 reflecting surface is the same as the design method of the A1 reflecting surface and the A2 reflecting surface, and will not be described here again. Thus, the light emitted from the light source 901 is limited in the light emission angle in the B direction by the A1 reflecting surface and the A2 reflecting surface (as shown in fig. 9 a), and in the a direction by the B1 reflecting surface and the B2 reflecting surface (as shown in fig. 9B), so that the angle limitation of the light in two orthogonal directions is achieved by the reflecting channel 902, so that the light emitted from the reflecting channel can be collected as much as possible by the lens, thereby improving efficiency.

The foregoing embodiments do not describe specific implementations of the A1 and A2 reflective surfaces, but may of course be implemented using similar aluminized or silvered mirrors. In the present embodiment, the reflective channel 902 is a transparent material body, as shown in fig. 9c, the A1 reflective surface 902A1, the B1 reflective surface 902B1, the A2 reflective surface 902A2, and the B2 reflective surface 902B2 are smooth surfaces of the side surfaces of the transparent material body, and after the light emitted from the light source enters the reflective channel from the light inlet of the reflective channel, part of the light enters the smooth surfaces of the side surfaces of the transparent material body and is totally reflected. This has the advantage of easy processing, all reflective surfaces being integrally formed and, due to total reflection, the reflectivity is close to 100%. The disadvantage of the physically reflective channel 902 is that the solid lens material absorbs some of the light, which is generally acceptable in practical applications. A further advantage of using a solid reflective tunnel 902 of transparent material is that preferably the first end of the shaped reflective surface 904 is positioned against the light exit of the tunnel so that the mirrored virtual reflective tunnel (reflector cup) is positioned against the solid reflective tunnel so that the far field light distribution is continuous without gaps. In the case of a reflection channel formed by a silver-plated or aluminum-plated mirror, since any one of the reflection surfaces must have a thickness, the shaping reflection surface 904 is only closely attached to the rear of the reflection surface, and must have a thickness distance from the reflection surface.

In the present embodiment, the reflective channel 902 is made of transparent material, which also has a problem that the distance h from the light inlet to the light outlet of the reflective surface A1 and the reflective surface A2 is required _A Is equal to the distance h from the light inlet to the light outlet of the B1 reflecting surface and the B2 reflecting surface _B I.e. h _A ＝h _B . According to the design method of the A1 reflecting surface and the A2 reflecting surface, h _A Is an angle, B, limited according to the requirement of the direction B _in 、b _out Is designed reasonably and cannot be adjusted at will; same h _B Is the width a of the light outlet in the direction A according to the angle required to be limited in the direction A _out The width of the light inlet in the A direction is a _in Is designed reasonably and cannot be adjusted at will. For example, in the present embodiment, since the width of the light source 901 in the B direction is smaller than that in the a direction, h is the same even if the reflection path controls the light emission angle in both directions A, B _A Also is smaller than h _B A kind of electronic device.

In order to make the reflective channels have the same height in both directions A, B, in this embodiment, the reflective channels further include A1 extending surface 902A1L and A2 extending surface 902A2L extending in the a direction congruently, the A1 extending surface 902A1L and the A2 extending surface 902A2L are both flat surfaces, the A1 extending surface 902A1L is located on the side of the A1 reflecting surface 902A1 away from the light source and connected to the A1 reflecting surface 902A1, and the total height of the two surfaces in the directions perpendicular to the a and B after connection is equal to h _B The A2 extension surface 902A2L is positioned on one side of the A2 reflection surface 902A2 far from the light source and is connected with the A2 reflection surface 902A2, and the total height of the two surfaces in the direction perpendicular to the A and B direction is equal to h _B . More specifically, the A1 reflecting surface902a1 extends out of the plane 902a1L towards the lens direction, the A2 reflecting surface 902a2 extends out of the plane 902a2L towards the lens direction, and the total length after extension is equal to h _B . In the direction B, light exiting from the light outlets of the A1 reflecting surface and the A2 reflecting surface is reflected and propagated directly on the two extending reflecting surfaces, and the reflection and propagation process has little influence on the light emission angle (if the two extending reflecting surfaces are parallel to each other, the light emission angle is not influenced at all, and in consideration of the fact that the draft angle is required to be left in the injection molding process, the light exiting from the light outlets of the extending planes 902A1L and 902A2L has little influence on the light emission angle), so that the light exiting from the light outlets of the A1 reflecting surface and the A2 reflecting surface can be regarded as the same state, that is, the same light emission angle. This solves the problem that the height of the reflective channels must be the same in both directions A, B.

In the present embodiment, it is preferable that the preferable design method of the B1 reflecting surface and the B2 reflecting surface is the same as the design method of the A1 reflecting surface and the A2 reflecting surface. Of course, different designs of the B1 reflecting surface and the B2 reflecting surface may be adopted, for example, the B1 reflecting surface and the B2 reflecting surface are opposite parallel planes, so that the purpose of limiting the light emitting angle in the a direction (because the reflection between the two parallel planes cannot change the angle) cannot be achieved, but the diffusion of the light emitting aperture in the a direction is suppressed by the reflection on the B1 reflecting surface and the B2 reflecting surface as well. For another example, the B1 reflecting surface and the B2 reflecting surface are opposite planes with a certain inclination angle, so that the purpose of compressing the light emitting angle can be achieved.

In the embodiment shown in fig. 9a and 9B, the compression emission angle in the a direction is achieved by proper design of the B1 reflecting surface 902B1 and the B2 reflecting surface 902B2 of the reflecting tunnel 902 such that the emission half angle in the a direction isAt the same time, the compression emission angle in the B direction can be realized by reasonable design of the A1 reflecting surface 902A1 and the A2 reflecting surface 902A2 of the reflecting channel, so that the luminous half angle in the B direction is +>In this embodiment, < > a->Since a larger aperture lens is required to receive the light emission angle, the width of the lens 903 in the a direction is equal to the width thereof in the B direction, so that the outgoing light of the reflection tunnel 902 can be received in both the a direction and the B direction. In the present embodiment, the width of the light source 901 in the A direction is larger than that in the B direction, that is, the light entrance width a of the reflection channel _in >b _in If->Then there must be a _out >b _out . Also due to->Thus h _B >h _A It is therefore necessary to use the A1 extending surface 902A1L and the A2 extending surface 902A2L to equalize the heights of the reflection channels in both directions a and B.

In practical applications, the light-emitting angle of the reflection channel in the B direction may be different from that in the A direction, i.e.For example->At this time, the width of the lens in the direction A can be smaller than that in the direction B, so that a strip-shaped light outlet appearance is formed, and the appearance has a better technological sense. This requires a discussion of two situations. In the first case, the light sources have equal widths in the A and B directions, i.e. a _in ＝b _in . Due to->a _out >b _out Thus h _B >h _A . At this time still needThe A1 extension plane and the A2 extension plane are used to equalize the heights of the reflection channels in both directions a and B. Of course another example +.>And a _in ＝b _in H is then _A >h _B It is of course necessary to use a B1 extension plane and a B2 extension plane to equalize the heights of the reflection channels in both directions a and B. In the second case, the width of the light source in the A direction is smaller than the width thereof in the B direction, i.e. a _in <b _in Then h cannot be determined at this time _A And h _B Is even likely to occur h _A ＝h _B Is the case in (a). For example, a _in 1mm, b _in 2mm @ of>15 degrees, then a _out Is 3.86mm, h _B 9.07mm. If->22 degrees, b _out Is 5.34mm, h _A Just 9.07mm, i.e. h _A ＝h _B . The extension surface is not required at this time.

In summary, whether to use the extension surface depends on the actual design requirement. If in the design h _A ≠h _B It is necessary to use an extension plane in a smaller direction to make the heights of the reflection channels equal in both directions a and B, if in design h _A ＝h _B The use of extension surfaces is no longer necessary. In particular, a preferred embodiment is the angle of the reflection channel in the direction BNot equal to its light emission angle in the a direction +.>This is advantageous for realizing the shape of the strip-shaped lamp, and whether the lamp needs to be used at the moment The extension plane is then related to the dimensions of the light source in both directions a and B.

A schematic structural diagram of another embodiment of the present invention is shown in fig. 10a and 10 b. Unlike the embodiment shown in fig. 9a and 9B, in this embodiment, as shown in fig. 10B, a second shaping reflective surface 1005 is further included that is located between the reflective channel 1002 and the optical path of the lens 1003 and extends congruently in the direction B, and a first end of the second shaping reflective surface 1005 is close to the light outlet of the reflective channel 1002, and a second end extends toward the lens 1003. As can be seen from a comparison of fig. 10b and fig. 9b, in the present embodiment, the width of the lens 1003 in the a-direction is significantly reduced, so that the light emitted from the reflective channel 1002 in the a-direction is incident outside the lens, such as light 1021, and if there is no reflection by the second shaping reflective surface 1005, the light 1021 is not collected by the lens as much as the light 1021', and is not satisfiedWherein->Is the luminous half angle of the reflection channel in the A direction, L _A Is the effective width of the lens in the A direction due to L _A Is greatly reduced, so that +.>Much of the light exiting the reflective channel will not be collected by the lens in the a direction.

The second shaping reflective surface 1005 may solve this problem. For example, light 1021 is reflected by the second shaping reflective surface 1005 to form light 1022, which is incident within the aperture of the lens 1003 and exits to form light 1023. As can be seen from the foregoing analysis method, the virtual light 1022' obtained by the back-pushing light 1022 can be equivalently regarded as being emitted from the virtual reflection channel 1002', that is, the light outlet of the virtual reflection channel 1002' can be equivalently regarded as the expansion of the real reflection channel 1002 in the +a direction, so that the light spot formed in the far field expands correspondingly in the-a direction, and the schematic diagram of the far-field light distribution in this embodiment is shown in fig. 10 c. As shown in fig. 10c, the light spot 1062 located in the middle of the direction a is formed by the light emitted from the reflection channel in the direction a directly entering the lens without the action of the second shaping reflection surface and being projected by the lens to the far field, and the illuminance gradient formed by the light spot 1062 in the direction B is the result of the action of the shaping reflection surface 1004 in the direction B, which is not described herein again; and due to the second shaped reflective surface 1005 in the direction a, the ghost path 1002' forms an extended spot 1063 in the direction-a, the illuminance of the extended spot 1063 being lower than the spot 1062, and the farther the distance in the direction-a, the lower the illuminance. Thus, the extended spot 1063 formed by the simultaneous action of the shaping reflective surface 1004 and the second shaping reflective surface 1005 has a decaying illuminance gradient in both the-a and-B directions, which again significantly expands the illumination range while maintaining the brightest illuminance in the overall light distribution substantially unattenuated. Further, in this embodiment, a third shaping reflective surface 1006 is further included, where the third shaping reflective surface 1006 is close to the light exit of the reflective channel in the-a direction, and accordingly forms a virtual reflective channel 1002″ connected to the physical reflective channel 1002 in the-a direction, and forms an extended light spot 1064 in the +a direction of the far field. The extended spot 1064 formed by the simultaneous action of the shaped reflective surface 1004 and the third shaped reflective surface 1006 has a decaying illumination gradient in both the +a direction and the-B direction, which again significantly expands the illumination range.

In the present embodiment, in the B direction, the width L of the lens 1003 _B Larger, can accept light at larger angles, and the light emission angle of the reflective channel 1002 in the B direction can be matched, i.eWherein->For the light-emitting half angle of the reflection channel in the direction B, the light-emitting angle range of the reflection channel emitted by the shaping reflection surface 1004 is not greatly changed; width L of lens 1003 in a direction a _A Significantly less than L _B Only a small angle in the a direction can be acceptedThere is a difficulty in that the reflection channel compresses the light emitting angle in the a direction very little, so that the light emitting angle of the reflection channel in the a direction does not match the receiving angle of the lens 1003, i.e./>Wherein->In order to reflect the luminous half angle of the channel in the A direction, the second shaping reflecting surface and the third shaping reflecting surface can utilize the light which cannot be incident on the lens in the A direction to form an expanded light spot in the A direction, so that the illumination area is enlarged.

In the description of the present invention, the a direction and the B direction are two directions orthogonal to each other, and the a direction is generally a horizontal direction and the B direction is a vertical direction. However, a and B are just a code number, which can be interchanged or refer to other directions, and it is within the scope of the present invention to provide that a and B are two directions orthogonal to each other.

In the above embodiment, the shaping reflective surface, the second shaping reflective surface, and the third shaping reflective surface are all planar, because the planar mirror facilitates the description of the equivalent virtual reflector cup and virtual reflector channel. In practice, the shaped reflective surface may be curved, and similarly, an extended spot may be formed in the far field. The extended light spots of the virtual reflector cup and the extended light spots of the physical reflector cup formed by the planar shaped reflecting surface are equal in width (because the virtual reflector cup and the physical reflector cup are in mirror image relationship), and the curved shaped reflecting surface can form wider extended light spots, so that a larger illumination range can be formed, which is described in the next embodiment.

Before describing another embodiment, it should be noted that the "shaping reflecting surface", "second shaping reflecting surface" or "xth shaping reflecting surface" and the like in the description of the present invention are actually all of the type of shaping reflecting surface, and are named differently for convenience of distinction in the description. Also, the embodiments of the present invention refer to "reflection channels" and "reflection cups" in various places, and it is understood from the above description that the reflection channels are formed on the basis of the reflection cups, and the difference is that the reflection cups are limited to light angles in one direction, and the reflection channels are limited to light angles in two orthogonal directions, so that the reflection channels are also a kind of reflection cups, and are more complex types of reflection cups, and thus, the reference to the reflection channels or the reflection cups in the description of the present invention refers to the optical device that is "reflection cups" and compresses the light emission angle of the light source.

A schematic structural diagram of another embodiment of the present invention is shown in fig. 11a, and the differences from the embodiment shown in fig. 10a include:

1.i.e. reflection channel 1102 emits light half angle +.>Far greater than half angle of the received light of the lens 1103 in the B direction +.>Such as ray 1123, which would otherwise exit in a direction outside of lens 1103 (ray originally exiting is shown in dashed lines in fig. 11 a) is reflected back into the aperture of lens 1103 by being incident on shaping reflective surface 1104. Another ray 1125 is also reflected by the shaped reflective surface 1104 back into the aperture of the lens 1103.

2. The shaped reflective surface 1104 is not a plane but a curved surface protruding away from the reflector cup, which has the advantage that a larger range of spread spots can be formed in the B direction. The back-thrust ray 1123 yields a virtual ray 1123', which can be seen to be equivalently seen emanating from the virtual light point 1123 s; the back-thrust ray 1125 results in a virtual ray 1125', which can be seen to be equivalently seen emanating from the virtual light point 1125 s. Since the shaping reflective surface 1104 is a curved surface protruding away from the reflector cup, it does not form a virtual reflector cup that mirrors the light exit of the reflector cup 1102, but rather can be seen as a collection of virtual light emitting points such as 1123s and 1125s that have a coverage width in the B direction that is significantly greater than the width of the light exit of the solid reflector cup 1102 in the B direction, since the shaping reflective surface 1104 is a curved surface protruding away from the reflector cup, and has a concave mirror effect on the magnification of the virtual image for incident light.

3. The first end of the shaped reflective surface 1104 is adjacent to the reflector cup 1102 in the +b direction while the second end extends towards the lens 1103 and the second end extends to the effective aperture edge of the lens 1103 over a length exceeding the embodiment shown in fig. 10 a. The effect of the extended length of the shaping reflective surface has been described in the embodiment shown in fig. 6a, i.e. the first end of the shaping stub is close to the end point of the A1 stub at the light exit, the line between the second end of the shaping stub and the end point of the A2 stub at the light exit, the angle alpha between the light exit of the reflector cup and the central line of the light entrance,satisfy->The shaping reflection can be realized without influencing the angle range of the emergent light of the reflecting cup. However, in the present embodiment, since the light emitting angle of the reflector cup is larger than the acceptance angle of the lens, it is necessary to +.>The light emitting angle is reduced by the shaping reflecting surface to be matched with the receiving angle of the lens, so that all light is ensured to be incident into the aperture of the lens as far as possible.

4. The reflector cup 1102 and the shaped reflective surface 1104 are considered to be an integral body having a light emission angle that matches the light emission angle of the lens 1103. Since the shaping reflective surface 1104 has an influence on the angular distribution of light, the overall light emitting angle of the reflective cup-shaping reflective surface is not symmetrical, so that in this embodiment, the overall reflective cup-shaping reflective surface rotates toward the lens to the shaping reflective surface, so that the central ray of the overall outgoing light coincides with the center of the lens, and thus it can be ensured that the overall outgoing light is incident as much as possible within the aperture of the lens 1103.

5. The center of the light outlet of the reflecting cup 1102 is not positioned on the center line Bc of the lens, and the shaping reflecting surface 1104 is positioned on one side of the reflecting cup 1102 far away from the center line Bc of the lens. In this embodiment, the light reflecting cup further includes a stop line diaphragm 1107 located on the side of the light outlet edge A2 of the light reflecting cup and extending along the direction a, and a schematic view of the stop line diaphragm is shown in fig. 11 b. The edge of the stop line diaphragm 1107 includes a first straight edge 1107a, and further includes a second straight edge 1107b parallel to the first straight edge and staggered from the first straight edge, the first straight edge 1107a extends deeper into the light outlet than the second straight edge 1107b, the first straight edge and the second straight edge are connected at the junction by a short edge 1107c, and the included angle between the short edge and the first straight edge and the second straight edge is smaller than 55 degrees and larger than 35 degrees. The far field light distribution thus produced is shown in fig. 11 c. It can be seen that the light distribution has a wider range in the B direction (because the range of virtual light emitting points is wider) than in fig. 10c, and an illuminance gradient in the B direction (the illuminance gradient shown as four cells in the figure is for convenience of illustration, and actually should be a substantially continuous distribution). The light distribution is mainly concentrated below the horizontal line Bc, and the edge near the horizontal line forms the shape of the edge of the stop line stop, which is the requirement of the car for low beam illumination. According to the requirement of low beam lighting of the automobile, as shown in fig. 11d, the edge of the cut-off line diaphragm 1107 includes a first straight edge 1107a and a hypotenuse 1107b intersecting the first straight edge 1107a, the angle between the hypotenuse 1107b and the first straight edge 1107a is larger than 65 degrees and smaller than 85 degrees, and the first straight edge 1107a is deeper into the light outlet than the hypotenuse 1107 b. The far field light distribution thus produced is shown in fig. 11 e.

In the description of the present invention, reference is made to the aperture of a lens a number of times, where the aperture refers to the effective aperture, and the effective aperture refers to the aperture of a lens that functions in conjunction with other elements of the present invention. In practical application, a frame is reserved for fixing some lenses, and the frame does not play an optical role, so that the frame does not belong to the calculation range of the effective caliber; some lenses are formed together with other lenses and are integral to form a large optical element, but in this area of partial functioning or original lens area, other lenses or optical elements cannot be counted as being within the effective aperture.

In the description of the present invention, since the optical principles of both the a-direction and the B-direction are described, the following is usedWhen the symbol α is given, the angle in the a direction is sometimes indicated by a subscript, the angle in the B direction is sometimes indicated by a subscript, and the angle in the a direction is sometimes indicated by a subscript.

In the above embodiments of the invention, the cooperation of the reflector cups and the shaped reflective surface is used to change the light distribution. As described above, the reflector cup is used for compressing the angle of the light emitted by the light source, so that the light outlet of the reflector cup can be regarded as a new light emitting half angle A small angle light source; at this time, the light outlets of the reflecting cups are basically uniformly distributed, and uniformly distributed light spots can be correspondingly formed in a far field. In the application fields of car lamps, the problems of too small concentrated illumination area, too bright nearby and the like exist, so that the formation of an enlarged uneven light spot and the maintenance of relatively high highest light intensity are important problems. The invention uses the function of the shaping reflecting surface to separate a part of energy from the main light spot to form an extended light spot, thereby solving the problem. The different forms of the shaping reflecting surface listed in different embodiments of the invention can form different patterns of extended light spots, but the essence is that the extended light spots are utilized to realize the expansion of the illumination area and the smaller loss of the highest light intensity.

In the above embodiments of the invention, the cooperation of the reflector cups and the shaped reflective surface is used to change the light distribution. As previously explained, the reflector cup is used to compress the angle at which the light source emits light so that the light outlet of the reflector cup can be considered asA new luminous half angle isA small angle light source; at this time, the light outlets of the reflecting cups are basically uniformly distributed, and uniformly distributed light spots can be correspondingly formed in a far field. In the application fields of car lamps, the problems of too small concentrated illumination area, too bright nearby and the like exist, so that the formation of an enlarged uneven light spot and the maintenance of relatively high highest light intensity are important problems. The invention uses the function of the shaping reflecting surface to separate a part of energy from the main light spot to form an extended light spot, thereby solving the problem. The different forms of the shaping reflecting surface listed in different embodiments of the invention can form different patterns of extended light spots, but the essence is that the extended light spots are utilized to realize the expansion of the illumination area and the smaller loss of the highest light intensity.

In the above description, sin (x) represents a sine function of x, and tan (x) represents a tangent function of x; asin (x) denotes the arcsine function of x, and atan (x) denotes the arctangent function of x.

It should be noted that the distinguishing technical features between the embodiments of the present invention are not limited to the application to the respective embodiments, but may be applied to the respective embodiments, and it is impossible to enumerate all possible combinations in the description of the present invention, so that the implementation principles and advantages of the respective technical features are described by way of example, and those skilled in the art will realize the advantages by using the implementation principles when applied to other embodiments.

The foregoing description is only illustrative of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present invention.

Claims

1. A light emitting device comprising a light source, characterized in that: the LED lamp also comprises a reflecting cup, wherein the reflecting cup extends along the A direction in a congruent manner, the reflecting cup comprises a light inlet and a light outlet which are opposite, and two opposite A1 reflecting surfaces and A2 reflecting surfaces are arranged between the light inlet and the light outlet; the direction B is orthogonal to the direction A, and the width of the light outlet in the direction B is B _out The width of the light inlet in the direction B is B _in The distance from the light inlet to the light outlet is h, wherein b _out >b _in And b _in +b _out <2h，The light emitted by the light source is incident on the light reflecting cup from the light inlet of the light reflecting cup, part of the light passes through the light reflecting cup and directly exits from the light outlet, and the rest of the light is incident on the A1 reflecting surface or the A2 reflecting surface of the light reflecting cup and exits from the light outlet after being reflected by the A1 reflecting surface or the A2 reflecting surface of the light reflecting cup;

the lens is an imaging lens and is used for projecting and imaging the light distribution of the focal plane of the lens to a far field, and the light emitted from the light outlet of the reflecting cup is incident on the lens and is projected to the far field by the lens; the effective width of the lens in the direction B is L _B The focal length of the lens is F,

the lens is characterized by further comprising a shaping reflecting surface which is positioned between the reflecting cup and the lens light path and extends along the A direction in a congruent manner, wherein the first end of the shaping reflecting surface is close to the light outlet of the reflecting cup, and the second end of the shaping reflecting surface extends towards the lens direction.

2. A light-emitting device according to claim 1, wherein: the distance from the second end of the shaping reflecting surface to the optical axis of the reflecting cup is not smaller than the distance from the first end to the optical axis of the reflecting cup.

3. A light-emitting device according to claim 1, wherein: the sectional lines of the A1 reflecting surface and the A2 reflecting surface on the section perpendicular to the A direction are an A1 sectional line and an A2 sectional line respectively, the A1 sectional line is at least partially parabolic, the focus of the parabolic is coincident with the end point of the A2 sectional line at the light inlet, and the part of the axis of the overfocal point of the parabolic on one side of the reflecting cup is inclined relative to the connecting line of the light inlet and the center of the light outlet in the direction away from the A1 sectional line; or,

4. A light-emitting device according to claim 1, wherein: the light source is characterized by further comprising a B1 reflecting surface and a B2 reflecting surface which extend along the B direction in a congruent manner, wherein the A1 reflecting surface, the B1 reflecting surface, the A2 reflecting surface and the B2 reflecting surface are connected together to form a reflecting channel, and light emitted by the light source enters from a light inlet of the reflecting channel and exits from a light outlet of the reflecting channel after being transmitted in the reflecting channel.

5. A light-emitting device according to claim 4, wherein: the reflection channel is a transparent material entity, the A1 reflection surface, the B1 reflection surface, the A2 reflection surface and the B2 reflection surface are smooth surfaces of the side surfaces of the transparent material entity, and after light emitted by the light source enters the reflection channel from the light inlet of the reflection channel, part of the light enters the smooth surfaces of the side surfaces of the transparent material entity and is totally reflected.

6. A light-emitting device according to claim 5, wherein: the first end of the shaping reflecting surface is tightly attached to the light outlet of the reflecting channel.

7. A light-emitting device according to claim 4, wherein: the lens also comprises a second shaping reflecting surface which is positioned between the reflecting channel and the lens light path and extends along the B direction in a congruent manner, the first end of the second shaping reflecting surface is close to the light outlet of the reflecting channel, and the second end of the second shaping reflecting surface extends towards the lens direction.

8. A light-emitting device according to claim 1, wherein: in the direction B, the center of the light outlet of the reflecting cup is not positioned on the center line of the lens, and in the direction B, the shaping reflecting surface is positioned on one side of the reflecting cup, which is far away from the center line of the lens.

9. A light-emitting device according to claim 1, wherein: the sectional lines of the A1 reflecting surface, the A2 reflecting surface and the shaping reflecting surface on the section vertical to the A direction are respectively an A1 sectional line, an A2 sectional line and a shaping sectional line, the first end of the shaping sectional line is close to the end point of the A1 sectional line at the light outlet, the connecting line of the second end of the shaping sectional line and the end point of the A2 sectional line at the light outlet, the included angle between the connecting line of the light outlet of the reflecting cup and the center of the light inlet is alpha,

10. a vehicle lamp, characterized in that: a light emitting device comprising any one of claims 1 to 9, further comprising a housing and a mask, the light emitting device being secured within the housing, the mask forming a seal with the housing, light emitted by the light emitting device exiting through the mask.