WO2019100240A1

WO2019100240A1 - Led light source high and low beam integrated car light module

Info

Publication number: WO2019100240A1
Application number: PCT/CN2017/112284
Authority: WO
Inventors: 祝贺; 仇智平
Original assignee: 武汉通畅汽车电子照明有限公司
Priority date: 2017-11-22
Filing date: 2017-11-22
Publication date: 2019-05-31

Abstract

A light-emitting diode (LED) light source high and low beam integrated car light module: high and low beam LED circuit boards (5, 8) are respectively disposed, and a primary reflector (10) that is used for forming a low beam shape may independently form the widening of the low beam shape, while a secondary reflector (9) increases the number of light rays that form the low beam shape, part of the reflected light being used simultaneously to form an area III of the low beam shape. Light emitted by the LED light source of the low beam LED circuit board (8) is reflected by means of the first and second reflectors, and the majority of the light rays are emitted after being refracted by a lens (4) so as to form the widening (5-1) of the low beam shape on a screen, while the other small part of the light rays are emitted from the lens (4) after being reflected and refracted by a condenser so as to form a cut-off line (5-2) and the area III (5-3) in the low beam shape. Thus, no square aluminium-plated surface needs to be manufactured on a heat radiator or other parts, part processing being simple and costs being low; a small car light module may integrate an adaptive driving beam (ADB) function, and no noise is produced when switching between high and low beams.

Description

LED light source far and near light integrated lamp module

Technical field

The invention relates to a vehicle lamp. In particular, the invention relates to an LED light source far and near light integrated vehicle lamp module.

Background technique

With the application of LED light source in the lamp, the lamp module technology is constantly being updated, the shape and structure are more and more diversified, and the volume and weight are getting smaller and smaller.

The existing LED light source lamp module generally needs to be partially plated with aluminum on the heat sink, and the aluminum plated surface and the light shielding plate on the heat sink are matched to form a III area light shape on the screen, and the necessary condition is that The structure positions a portion of the light from the source to illuminate the location of zone III.

However, according to the existing far and near light integrated lamp module, the III-area light-shaped forming structure needs to make a square aluminized surface on the heat sink or other parts, because the test points of the III area are approximately arranged in a square shape, so the general III area light The shapes are approximately square, and there are also oval-like or other more irregular shapes. Under the premise of meeting the regulations, the shape of the light structure in Zone III is more regular and more beautiful. However, this makes the part processing process more complicated and costly. In addition, according to the existing far and near light integrated vehicle light module, in order to switch between far and low beam, it is also necessary to provide a visor part, so that the size of the lamp module is large, and the switching of the far and low beam is performed. Have a certain amount of noise.

Referring to Fig. 1, the III-shaped light-shaped structure is formed on the heat sink, so that the structure of the heat sink is complicated, and the surface of the III-zone structure needs to be polished, surface-plated, etc., and the processing technology is complicated and the cost is high. The lamp module is also complicated in structure. In addition, the optical model of the III zone is more complicated and the light distribution is more difficult.

Furthermore, according to the conventional near-light-integrated vehicle lamp module, the near-light-shaped cut-off line is formed on the structure, and a visor having a shape of a cut-off line is required, and the visor needs to be rotated by a mechanical transmission mechanism to perform the distance. Switching of low beam. In this kind of structure, the switching of the far and low beams has a certain noise, and the transmission structure is relatively complicated, and the volume of the lamp module is also increased to some extent.

Summary of the invention

The technical problem to be solved by the invention is that the existing near-light-integrated vehicle lamp module, the III-zone light-shaped forming structure does not need to make a square aluminized surface on the radiator or other parts, the parts are simple to process and the cost is low; the lamp The module has a small volume and there is no noise in switching between far and low beams.

The invention provides an LED light source far and near light integrated vehicle light module, and the technical scheme of the LED light source far and near light integrated vehicle light module is as follows:

LED light source far and near light integrated vehicle light module, comprising concentrator 1, hood 2, lens 4, heat sink 6, far and low beam LED circuit board, mirror, characterized in that

The hood 1 is provided with a hood 2 at the front.

A high beam LED circuit board 5 and a low beam LED circuit board 8 are disposed behind the concentrator 1 respectively.

The mirror includes a primary mirror 10 and a secondary mirror 9 respectively disposed behind the concentrator 1.

The primary mirror 10 and the secondary mirror 9 are used to form a low beam shape, wherein the primary mirror 10 can independently form a broadening of the low beam shape, and the presence of the secondary mirror 9 increases the formation of low beam light. The number of rays in the shape to improve the light effect, on the other hand, a part of the light reflected by the secondary mirror 9 is used to form the III region 5-3 of the low beam shape,

The light emitted by the LED light source on the low-beam LED circuit board 8 is reflected by the primary mirror 10 and the secondary mirror 9, and most of the light is refracted by the lens 4 and then emitted to form on the screen. The broad light pattern has a broadening 5-1, and another small portion of the light is reflected and refracted by the concentrator 1 and then emitted from the lens 4 to form a near-light-shaped cut-off line 5-2 and a region III 5- 3,

A block-shaped cavity structure is opened in the left or right portion of the concentrator (1).

The shape of the low beam formed by each of the lamp modules is not the same, but the most basic is to meet the requirements of the regulations. In addition, the road surface illumination is uniform and the dispersion is good. See LED lights regulations GB25991-2010.

According to the present invention, the light emitted by the LED light source of the high-beam LED circuit board 5 is not required for the mirror, because the light emitted by the LED light source of the high-beam LED circuit board 5 is not reflected by the mirror, but is completely in the concentrator 1. After reflection and refraction, it is then emitted through the lens 4.

According to the invention, the concentrator (1) is used for left or right headlights, and the blocklight cavity structure of the high beam LED source (2) corresponding to the opening above the left or right portion of the concentrator (1) (7) The high-end LED light source at the back end can be turned on and off separately.

According to the present invention, an LED light source far and near light integrated vehicle lamp module is characterized in that

The concentrator 1 includes at least one high beam concentrating structure 1-1, a III area light forming structure 1-2, and a cutoff line forming structure 1-3.

The III region light-forming structure 1-2 is located at an upper portion of the concentrator 1

The cut-off line forming structure 1-3 is located at the front end of the concentrator 1, that is, near the lens end.

Here, the position near the light source is the rear, and the direction away from the light source and the near lens is the front, and the front and the back are only a relative concept.

The III-region light-form forming structure 1-2 includes a III-region light-shaped broadening forming structure 1-2-1, a III-region luminance reducing structure 1-2-2, and a 50-L dark region forming structure 1-2-3.

The near-light-shaped III zone and 50L have test points required by regulations, and must meet the regulatory requirements, and each test point has a basis, see Regulation GB25991-2010. The illumination of the III region of the present invention and the illumination of the 50L dark region satisfy the regulations as in the past, but the implementation is different.

The light-width broadening of the III region forms a structure 1-2-1. The rear end surface is a circular arc shape having a concave shape or a convex arc shape.

According to the present invention, it is preferable that the radius of the circular arc of the III-zone light-form broadening forming structure 1-2-1 is R1.3-1.7 mm, preferably 1.5 mm.

The section of the III region light-shaped broadening forming structure 1-2-1 is the one circled in FIG. 8 and has a circular arc shape. The arc radius of the present invention is R1.3-1.7 mm, preferably 1.5. Mm. Its function is to reduce the light intensity of the part of the III zone, because the brightness of the part of the III zone cannot be too bright, and it should be within a certain range of values, see GB25991-2010 for details.

The III region is formed into a planar shape by forming the structure 1-2-1.

In the past, a part of the light was reflected by a specially designed III-region structure, and the present invention integrated the III-region forming structure and the concentrator, and the light forming the III region is reflected by the mirror and irradiated onto the III-forming structure. After being refracted, the concentrator is emitted and then passed through a lens to form a region III.

The III-region light-shaped luminance reduction structure (1-2-2) is disposed on the side of the III-region broadening forming structure (1-2-1). The square-hole structure of the opening forward and downward is used to reduce the local brightness of the III region in the low-beam shape, so that the local brightness of the III region is more controllable.

The structure is a square hole structure as shown in Fig. 9. The position is designed and tested, and cannot be arbitrarily arranged. The function is to reduce the local brightness of the III area, specifically P7 and P8 points, see GB25991-2010. This structure is unique to the present invention, and there is no such structure in the past, which makes the local brightness of the III region more controllable.

The square hole structure size range is as follows:

It is 2.5-3.0mm long, 0.3-0.6mm wide and 0.2-0.3mm high.

Preferably, according to the present invention, the square hole structure size range is as follows:

It is about 2.8 mm long, about 0.4 mm wide, and about 0.3 mm high.

The 50L dark area forming structure 1-2-3 is triangularly convex perpendicular to the light propagation direction (ie, the low beam irradiation axial direction), and the triangular protrusion size is: 3-5 mm in length, 0.3-0.5 mm in width, and 0.4-in height. 0.6mm, this structure makes the brightness of the 50L area in the low beam shape controllable.

The 50L dark area forming structure 1-2-3 refers to the structure shown in FIG. 10, which is disposed on the path originally irradiated at the 50L test point, in order to reduce the brightness of 50L, because this point is the driver's eye in the direction of the vehicle. Location, can not be too dazzling, specifically visible GB25991-2010. At present, the structural triangle is an isosceles triangle with a bottom edge of 15°. Other dimensions are determined by design and simulation, but not unique, and the possibility that the object can be achieved similarly to other structures is not excluded.

The 50L dark zone forming structure can make the low beam without glare under the premise of having sufficient illumination, so as not to affect the normal driving behavior of the opposite driver.

The 50L dark area forming structure 1-2-3 is perpendicular to the direction of light propagation, and the triangular convex structure is an isosceles triangle having a bottom edge of 10-20°.

Preferably, the structural triangle is an isosceles triangle with a base of 15°.

Before the cut-off line forming structure (1-3), that is, the contour curve of the end surface of the near lens end is used to form a cut-off line shape of 15° or 45°, and the end surface of the contour is perpendicular to the direction of the light and/or along the direction of the light. A concave or convex arc shape having a radius of R40-50 mm.

Before the cut-off line forming structure (1-3), the contour curve of the end surface of the near lens end is perpendicular to the direction of the light and the concave arc shape along the direction of the light.

The radius of the circular arc is R40-50mm.

Preferably, according to the invention, the circular arc has a radius R45 mm. This radius is related to the light effect.

The contour curve of the upper end surface of the cut-off line forming structure 1-3 is used to form a cut-off line shape of 15° or 45°, and the contour end surface has a planar shape.

The structure is used to reduce the local brightness of the III region in the low beam shape, so that the low beam does not produce glare under the premise of sufficient illumination.

The III region light-shaped broadening forming structure 1-2-1 has a planar shape.

In the past, a part of the light is reflected and emitted from the lens by the specifically designed III region structure, and the present invention integrates the III region forming structure and the concentrator, and the light forming the III region is reflected by the mirror and irradiated onto the III forming structure. After being refracted, the concentrator is emitted and then passed through a lens to form a region III.

According to the present invention, an LED light source and a light-integrated vehicle light module can be further provided with a fan 7 for active heat dissipation of the near-near-light integrated vehicle light module. The fan may be disposed at a rear end, a lower end or a side of the module, and the fan 7 is fixedly connected to the heat sink 6.

According to the present invention, a light source of a light source is provided with two rectangular grooves on the side of the concentrator 1 for positioning on the heat sink 6, and the concentrator 1 is provided. Have at least 1 screw hole structure for safety Mounted and fixed on the heat sink 6.

The beneficial effects of the invention are:

The formation structure of the III region light shape and the high beam concentrator parts are integrated, the space occupation volume is small, the visor parts are not needed, and the space utilization efficiency is greatly improved;

The formation of the III region uses a part of the light of the mirror to be refracted by the III region on the high beam concentrator and then is emitted from the lens. The aluminum alloy optical surface is not required on the heat sink, and the structure and processing process of the part are relatively simple;

The formation structure of the III zone and the high beam concentrator are integrated, and the assembly precision is ensured;

The formation structure of Zone III is more controllable and the light distribution efficiency is higher.

DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing a light-forming structure of a III region in the prior art.

2 is a perspective structural view of a near-light-integrated vehicle lamp module of the present invention.

3-1 and 3-2 are respectively perspective structural views of the high beam concentrator of the present invention.

Figure 4 is a schematic view of the light direction of the III region of the present invention.

Fig. 5 is a close-up light pattern diagram of the near-light-integrated vehicle lamp module of the present invention.

Fig. 6 is a high beam light pattern diagram of the far and near light integrated vehicle lamp module of the present invention.

Fig. 7 is a schematic view of each test point and zone of the low beam.

Fig. 8 is an enlarged schematic view showing the light-shaped broadening forming structure 1-2-1 of the III region of the present invention.

Fig. 9 is an enlarged schematic view showing a square-hole structure of the III-zone light-shaping forming structure 1-2-1 of the present invention.

Figure 10 is an enlarged schematic view showing a 50L dark region forming structure 1-2-3 of the present invention. Among them, the 50L dark region forming structure 1-2-3 is triangularly convex perpendicular to the light propagation direction (ie, the low beam irradiation axial direction).

In the figure, 1. concentrator, 2. hood, 3. lens collar, 4. lens, 5. high beam LED circuit board, 6. heat sink, 7 is opened in the concentrator (1) a left or right upper portion, a slot-shaped or hole-shaped block-shaped cavity structure that is open at the top, and 7-1 is a rear end surface inside the block-shaped cavity structure, that is, a near-incident light side end surface, 7-2 is a The intermediate side end surface of the left or right side of the block-shaped cavity structure, 7-3 is the inner front side end surface of the block-shaped cavity structure, that is, the near-lens exiting light side end surface. 8. Low-light LED circuit board, 9. secondary mirror, 10. primary mirror, 11. fan, 1-1. high beam concentrating structure, 1-2.III area forming structure, 1-3. Line forming structure, 1-2-1.III area broadening to form a knot Structure, 1-2-2.III area brightness reduction structure, 1-2-3.50L dark area formation structure, 5-1. Low beam shape broadening, 5-2. Low beam cut-off line, 5-3 near Light and light shape III area.

Detailed ways

The invention is further described below in conjunction with the drawings and specific embodiments.

Example

As shown in FIG. 2, an embodiment of the present invention provides a far and near light integrated vehicle light module for use in lighting of a car and placed in a headlight of a car. The far and near light integrated vehicle light module comprises a concentrator 1, a hood 2, a lens collar 3, a lens 4, a high beam LED circuit board 5, a heat sink 6, a fan 7, a low beam LED circuit board 8, and a secondary reflection. The mirror 9 and the primary mirror 10. The overall size of the near-light integrated light module is about 150 mm long, about 100 mm wide, and about 70 mm high, wherein the lens opening size is 50 mm*70 mm.

A high-temperature adhesive is applied between the high-beam LED circuit board 5 and the low-light ED circuit board 8 and the heat sink 6. The high-beam LED circuit board 5 and the low-beam ED circuit board 8 respectively have a circular positioning hole and one The waist positioning hole and the two screw holes, the high beam LED circuit board 5 and the low beam ED circuit board 8 are respectively positioned on the heat sink 6 by two cylindrical pins on the heat sink 6, and then respectively installed by two mechanism screws, It is fixed on the heat sink 6. The concentrator 1 is positioned on the heat sink 6 by two groove structures on the side, and the concentrator 1 is mounted and fixed on the heat sink 6 by two self-tapping screws. The primary mirror 10 and the secondary mirror 9 respectively have a circular positioning hole, a waist positioning hole and two screw holes, and the primary mirror 10 and the secondary mirror 9 are provided on the heat sink 6. The two common cylindrical pins are positioned on the heat sink 6, and are respectively mounted and fixed on the heat sink 6 by two self-tapping screws. After the primary mirror 10 and the secondary mirror 9 are mounted in position, they have a uniform plane of symmetry. The hood 2 has a circular positioning hole, a waist positioning hole and two screw holes, and the hood 2 is positioned on the radiator 6 by two cylindrical pins on the radiator 6, and then two self-tapping The screw is mounted and fixed to the heat sink 6. There are two rectangular grooves on the upper and lower ends of the lens 4. The hood 2 is provided with four corresponding rectangular positioning posts. The lens 4 is positioned on the hood 2, and the lens collar 3 is mounted on the lens 4 through the snap fit structure. And fixed on the hood 2. The fan 7 is mounted by four self-tapping screws and fixed to the rear end of the heat sink for heat dissipation of the near-light integrated light module.

The concentrator 1 of the near-light-integrated vehicle lamp module comprises three high-beam concentrating structures 1-1, a III-zone forming structure 1-2 and a cut-off forming structure 1-3, as shown in FIG. Three high-beam concentrating structures are located at the rear end of the concentrator 1 for concentrating the light emitted by the LED light source on the high-beam LED circuit board 5, and illuminating the high-beam light shape. Zone III forming structure 1-2 is located in the poly At the upper end of the optical device 1, the cut-off line forming structure 1-3 is located at the front end of the concentrator 1. Before the cut-off line forming structure (1-3), that is, the contour curve of the end surface of the near lens end is used to form a cut-off line shape of 15° or 45°, which is a concave shape whose shape is perpendicular to the direction of the light. At the same time, the circular arc shape also has a concave arc shape along the direction of the light.

The material of the concentrator 1 of the near-light integrated light module can be PC or PMMA.

In addition, a block-shaped cavity structure is opened in the left or right portion of the concentrator (1).

The concentrator (1) is used for the left or right headlights, and the far-light LED light source (2) is located at the rear end of the block-shaped cavity structure (7) corresponding to the opening above the left or right portion of the concentrator (1). The light LED light source can be individually turned on and off.

The low-light LED circuit board 8 is provided with a 5-chip LED light source, and the high-beam LED circuit board 5 is provided with a 3-chip LED light source and two 1-chip LED light sources. In the normal temperature environment, the output light flux of the 5-chip LED light source is 1800 lm, the output light flux of the 3-chip LED light source is 750 lm, and the output luminous flux of the 1-chip light source is 250 lm. 35 ° C in front of the simulated ambient light, 70 ° C after the light, the near-beam luminous flux output is about 750 lm, the brightness is about 60 lx, the low beam shape is shown in Figure 5; the high beam luminous flux output is about 1300 lm, the brightness is about 115 lx, the high beam shape is Figure 6 shows.

At present, the common LED light source lamp module generally needs a part of the aluminum plated surface and the visor on the heat sink to form a III-area light shape on the screen. The structure is schematically shown in Figure 1, and the III area light is made on the heat sink. The shape forming structure makes the structure of the heat sink more complicated, and the surface of the III area is also required to be polished, surface aluminized, etc., the processing process is complicated, the cost is high, and the entire lamp module is also complicated in structure, and The optical model of Zone III is more complicated and it is more difficult to distribute light. The far-and-light-integrated vehicle lamp module provided by the invention has a III-zone forming structure on the concentrator, as shown in FIG. 4 is a schematic view of the light direction of the III region. A part of the light source emitted by the LED on the low-light LED circuit board 8 is reflected by the primary mirror 10 and the secondary mirror 9 and then incident on the concentrator 1. The III region is broadened to form a structure 1-2-1, which is refracted by the concentrator 1, and finally ejected through a lens to form a III region 5-3 as shown in FIG. The light-shaped broadening of the III region forms the front end of the structure (1-2-1), that is, the end surface of the near-light source end has an outer convex arc shape with an outer shape along the light.

The concentrator 1 is provided with a 50L dark area forming structure, so that the light emitted by the far and near light integrated vehicle light module does not produce glare under the premise of sufficient illumination, so as to avoid affecting the normal driving of the opposite driver. behavior. The location of the 50L point and the location of the test points and zones of the low beam in other regulations are shown in Figure 7.

The III widening forming structure 1-2-1 on the concentrator 1 of the near-and-near-light integrated vehicle lamp module has a square-region-shaped III-region brightness reducing structure 1-2-2 on the light distribution. Can be adjusted by its length, width, height and Its spatial position can reduce the brightness of a specific area of the III region so that its brightness is between 0.1 lx and 0.7 lx. The formation space of the III area is small in space, no need for visor parts, space utilization efficiency is greatly improved, assembly precision is high, and the heat sink does not need polishing, aluminum plating and the like, and the cost of parts is reduced. From the point of view of light distribution, the III region forming structure provided by the invention has simpler light distribution and greatly improves the light distribution efficiency.

Claims

LED light source far and near light integrated lamp module, comprising concentrator (1), hood (2), lens (4), heat sink (6), far and low beam LED circuit board, mirror, and its characteristics Yes,

a hood (2) is disposed at a front portion of the concentrator 1, that is, a near lens portion.

The high-light LED circuit board (5) and the low-beam LED circuit board (8) are respectively disposed behind the concentrator (1), that is, the near-light source portion.

The mirror includes a primary mirror (10) and a secondary mirror (9) respectively disposed behind the concentrator (1).

The primary mirror (10) and the secondary mirror (9) are used to form a low beam shape, wherein the primary mirror (10) is capable of independently forming a broadening of the low beam shape, and the presence of the secondary mirror (9) On the one hand, the number of rays forming the low beam shape is increased to improve the light effect, and on the other hand, a part of the light reflected by the secondary mirror (9) is used to form the III region (5-3) of the low beam shape,

Light emitted by the LED light source on the low-beam LED circuit board (8) is reflected by the primary mirror (10) and the secondary mirror (9), and most of the light passes through the lens (4) After being refracted, the broadening (5-1) of the low beam shape is formed on the screen, and another small portion of the light is reflected and refracted by the concentrator (1) and then emitted from the lens (4) to form a near Light-light cut-off line (5-2) and III area (5-3),

A block-shaped cavity structure is opened in the left or right portion of the concentrator (1).
An LED light source near-light integrated vehicle lamp module according to claim 1, wherein

The concentrator (1) is used for the left or right headlights, and the far-light LED light source (2) is located at the rear end of the block-shaped cavity structure (7) corresponding to the opening above the left or right portion of the concentrator (1). The light LED light source can be individually turned on and off.
An LED light source near-light integrated vehicle lamp module according to claim 1, wherein

The concentrator (1) includes at least one high beam concentrating structure (1-1), a III area light forming structure (1-2), and a cutoff line forming structure (1-3).

The III-region light-forming structure (1-2) is located at an upper portion of the concentrator (1).

The cut-off line forming structure (1-3) is located at the front end of the concentrator (1), that is, near the lens end.
An LED light source near-light integrated vehicle lamp module according to claim 3, wherein

The III-region light-forming structure (1-2) includes a III-region light-shaped broadening structure (1-2-1), a III-region luminance reduction structure (1-2-2), and a 50-L dark region forming structure (1) 2-3).
The LED light source far and near light integrated vehicle light module according to claim 4, wherein

The light-shaped broadening of the III region forms the rear end of the structure (1-2-1), that is, the end surface of the near-light source end is a circular arc shape having a concave shape or a convex arc shape.
The LED light source far and near light integrated vehicle light module according to claim 4, wherein

The light-shaped broadening of the III region forms the rear end of the structure (1-2-1), that is, the end surface of the near-light source end has a planar shape.
An LED light source near-light integrated vehicle lamp module according to claim 3, wherein

The III-region light-shaped luminance reduction structure (1-2-2) is disposed on the side of the III-region widening forming structure (1-2-1), and is a square-hole structure in which the opening is forward and downward, and the structure is used to reduce the near The local brightness of the III region in the light pattern makes the local brightness of the III region more controllable.
An LED light source near-light integrated vehicle lamp module according to claim 7, wherein

The square hole structure size range is as follows:

It is 2.5-3.0mm long, 0.3-0.6mm wide and 0.2-0.3mm high.
The LED light source far and near light integrated vehicle light module according to claim 2, wherein

The 50L dark area forming structure (1-2-3) is perpendicular to the light propagation direction, that is, the near-light irradiation axial direction is a triangular protrusion, and the triangular protrusion size is: 3-5 mm in length, 0.3-0.5 mm in width, and 0.4 in height. -0.6mm, this structure makes the brightness of the 50L area in the low beam shape controllable.
An LED light source near-light integrated vehicle lamp module according to claim 9, wherein

The 50L dark area forming structure (1-2-3) is perpendicular to the direction of light propagation, and the triangular convex structure is the bottom side 10-20° isosceles triangle.
An LED light source near-light integrated vehicle lamp module according to claim 3, wherein

Before the cut-off line forming structure (1-3), that is, the contour curve of the end surface of the near lens end is used to form a cut-off line shape of 15° or 45°, and the end surface of the contour is perpendicular to the direction of the light and/or along the direction of the light. A concave or convex arc shape having a radius of R40-50 mm.
An LED light source near-light integrated lamp module according to claim 11, wherein

Before the cut-off line forming structure (1-3), that is, the contour curve of the end surface of the near lens end is used to form a cut-off line shape of 15° or 45°, and the contour end surface is a concave circle perpendicular to the light direction and along the light direction. arc.