Automobile headlight with variable color temperature and adjustable focal length

Abstract

The present invention discloses a car headlight with variable color temperature and adjustable focal length, which belongs to the technical field of automobile lighting equipment and is composed of a reflective cup, an LED circuit board, a dual light lamp, a red light guide column, a green light guide column and a blue light guide column. The LED circuit board is installed on the outer side of the tail of the reflective cup, and the dual light lamp is installed near the reflection focus of the reflective cup; the red light guide column, the green light guide column and the blue light guide column are distributed at 120° with the dual light lamp as the center of the circle, and one end is connected to the light source in the LED circuit board, and the other end extends into the reflective cup. The LED circuit board is installed on the outside of the reflective cup to facilitate heat dissipation. The LED light source with adjustable light color temperature can provide good visual effects for the driver under fog, rain and normal weather conditions. The shading plate with shape memory effect automatically changes the shading area according to the change of ambient temperature, so as to realize dynamic and continuous adjustment of the low beam distance of the car headlight.

Description

[Technical field]

[0001] The invention belongs to the technical field of automobile lighting equipment, and relates to an automobile headlight, in particular to an automobile headlight with variable color temperature and adjustable light focal distance. [Background technology]

[0002] Car headlights are essential functional components in cars. They are installed at the front of the car body and are used at night or in poor light environments. In addition to the brightness of the car headlights, the lighting effect of car headlights is also directly related to the color temperature of the light and the focal length of the light. Car headlights have the functions of high beam and low beam. The combination of high beam and low beam during night driving can help drivers identify obstacles on the road. At present, the color temperature of car headlights used more in the market is single, and they do not have the function of changing multiple color temperatures. In addition, the high and low beam functions of car headlights are fixed lighting distance modes, which will cause eye discomfort to the driver when the low beam and high beam are frequently switched. In order to improve the current driving safety of cars, it is necessary to make corresponding structural and functional improvements to the car headlights with single functions to meet the needs of consumers in a more humane way.

[0003] The invention patent with application number 200810167225.0 discloses an LED automobile headlamp with integrated high and low beams. A curved glass mirror is fixed in front of the lamp housing. After the slider-type linear motor is installed, the LED light source and the cooling fan are fixed on the slider. The focal length between the light source and the curved mirror is changed by the electric slider of the stepping motor to achieve the conversion of high and low beams. The utility model patent with application number 201520113910.0 discloses an automobile lamp with variable color temperature, including a shell, a blue light source and a non-blue light source are arranged in the shell, a light-transmitting medium is arranged at the light outlet end of the shell, the surface of the light-transmitting medium is coated with a fluorescent powder layer or a fluorescent powder layer is arranged inside, the blue light source and the non-blue light source are electrically connected to a control module, and the blue light emitted by the blue light source can activate the fluorescent powder through the light-transmitting medium to form a composite light with a color temperature. Then the control module controls the non-blue light source to emit light, and changes the luminous intensity of the non-blue light source according to the changes in the external weather. After the light emitted by the non-blue light source is mixed with the composite light, automobile lights with different color temperatures can be obtained.

[0004] Among the above-mentioned patents, the former provides a design scheme for continuously adjusting the focal length of the car's high and low beams based on the structure of the car headlights, and the latter provides a feasible solution for the application of dynamic color temperature control. However, both have problems in practical application. The variable position of the light-emitting body of the headlight will reduce its safety of use, and adding a large number of light sources in the headlight will bring new problems to the heat dissipation of the headlight. [Summary of the invention]

[0005] The technical problem to be solved by the present invention is to provide a car headlight with variable color temperature and adjustable focal length. A three-primary color LED light guide column is used to realize continuous adjustment of the color temperature of the car headlight, and a deformable sunshade is arranged near the low beam filament to realize gradual change of the low beam lighting distance, thereby solving the problem that the current car headlights have a single color temperature and a fixed focal length.

[0006] The technical solution of the present invention is as follows:

[0007] A car headlight with variable color temperature and adjustable focal length, which consists of a reflector cup, an LED circuit board, a double light lamp, a red light guide column, a green light guide column and a blue light guide column. The LED circuit board is installed on the outside of the tail of the reflector cup, and the double light lamp is installed near the reflection focus of the reflector cup; the red light guide column, the green light guide column and the blue light guide column are distributed at 120° intervals with the double light lamp as the center of the circle, and one end is connected to the light source in the LED circuit board, and the other end extends into the reflector cup.

[0008] The reflector is a reflector for long-distance spotlighting of car headlights. It is cup-shaped and has a reflective surface inside. The light source in the car headlight is installed at a specific position inside the reflector according to its structural and functional characteristics. The main light source of the car headlight, the dual light, is located near the reflective focus of the reflector, and other color matching light sources are evenly distributed along the axis of the reflector.

[0009] The dual-beam lamp is the main light source of the car headlight. It consists of a controller, a filament fixing column, a long-distance light filament, a short-distance light filament, a glass cover, a shading plate, and an independent space. The short-distance light filament and the long-distance light filament are connected to the controller through the filament fixing column. The long-distance light filament is located at the reflection focus of the reflector cup, and the short-distance light filament deviates from the reflection focus of the reflector cup and is located on the upper part of the long-distance light filament. The power of the long-distance light filament is greater than that of the short-distance light filament. If the short-distance light filament is not at the best focusing point of the reflector cup, the light will diverge, so the short-distance light can only shine at a relatively close distance in front of the car, and the irradiation angle will be wide and large. The light emitted by the long-distance light filament is reflected through the entire reflector cup, and the filament is at the best focusing point of the lamp cup, so the light can form a beam, which shines farther and brighter. An independent space is designed on the upper side of the short-distance light filament of the dual-beam lamp glass cover. The space has a boss structure, and a shading plate with a memory alloy function is placed on the boss.

[0010] The principle of adjustable low beam distance is that the visor in the independent space is a memory alloy with shape memory effect. It is a flat structure at low temperature. When the temperature rises, the two sides of the visor roll toward the center. The distance between the visor and the low-light filament is relatively close. The heat released when the filament emits light can change the ambient temperature of the visor. When the low-light filament starts to work, the temperature in the independent space is relatively low. The visor is a flat structure. Since the distance between the visor and the low-light filament is relatively close, it can block most of the light source. The light will be reflected by the reflective cup and will diverge, mainly illuminating the front of the car. As the working time of the low-light filament increases, the temperature in the independent space continues to rise. When the deformation temperature of the visor is reached, the two sides of the visor begin to deform and roll toward the center. The volume of the entire visor is greatly reduced, and the shielding area of ​​the low-light filament light source is reduced. At this time, the irradiation distance of the reflected light formed by the reflective cup gradually increases, thereby realizing the dynamic adjustment of the low-beam focal length of the car headlight.

[0011] White light with high color temperature has good visibility, but weak penetration, which affects the visible range and distance in foggy and rainy days; light with low color temperature has good penetration, but it is easy to cause visual fatigue. Therefore, car headlights are designed with variable color temperature structures. The three-primary color red, green and blue monochromatic LED light sources are used to match the color of car headlights. Since all light sources are concentrated in the reflective cup, the internal temperature will increase, which is easy to cause damage to the reflective cup and reduce its service life. The light guide column technology is used to set the three-primary color light source outside the reflective cup. The light guide column transmits light from one light source to another point at a certain distance from the light source with minimal loss. Red LED lamp beads, green LED lamp beads, and blue LED lamp beads are installed in the LED circuit board. The LED lamp beads are implanted in the light guide column. The side wall of the light guide column is coated with white reflective paint to reflect light with an angle less than the critical angle to reduce the loss of the light source during the propagation of the light guide column.

[0012] Principle of color temperature change: The car is equipped with sensors that can measure the external weather conditions in real time and judge the weather conditions such as rainy, foggy, etc. In case of foggy weather with low visibility, the LED circuit board control circuit controls the three-primary color LED lamp beads to match the color temperature with good transmittance. In foggy and rainy weather, the color temperature is reduced (3000-4300K ​​color temperature) to obtain light with good penetrating power; in non-foggy and rainy weather, the color temperature is increased (5000-6000K color temperature) to reduce the driver's eye fatigue. The three-primary color LED lamp bead power is controlled by the LED circuit board, and the light color temperature is automatically adjusted in the reflective cup through the light guide column to meet the needs of the driver.

[0013] The effects and benefits of the present invention are:

[0014] (1) Automobile headlights with variable color temperature and adjustable low beam distance. LED automobile headlights that can dynamically adjust the color temperature of light can provide drivers with good visual effects in fog, rain, and normal weather conditions;

[0015] (2) The three-primary-color LED light source is installed on the outside of the reflector cup by using a light guide column, which reduces the heat dissipation burden of the reflector cup, avoids damage to it caused by temperature sensing, and extends the service life of the car headlights;

[0016] (3) The shading plate with shape memory effect automatically changes the shading area according to the change of ambient temperature, so as to realize dynamic and continuous adjustment of the low beam distance of the car headlights.

Brief Description of the Drawings

[0017] Figure 1 Schematic diagram of the structure of a car headlight with variable color temperature and adjustable low beam distance.

[0018] Figure 2 Light guide position distribution diagram.

[0019] Figure 3 Schematic diagram of the dual light structure.

[0020] Figure 4 Schematic diagram of the structure of the normal temperature sunshade.

[0021] Figure 5 Schematic diagram of the high-temperature sunshade structure.

[0022] Figure 6 Schematic diagram of the LED circuit board and light guide column installation structure.

[0023] In the figure: 1 reflective cup; 2 LED circuit board; 3 double light; 4 red light guide column; 5 green light guide column; 6 blue light guide column; 21 red LED lamp beads; 22 green LED lamp beads; 23 blue LED lamp beads; 31 controller; 32 filament fixing column; 33 long-distance light filament; 34 short-distance light filament; 35 glass cover; 36 shading plate; 37 independent space. [Specific implementation method]

[0024] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0025] A car headlight with variable color temperature and adjustable focal length, as shown in the attached manual Figures 1-2 As shown, it consists of a reflective cup 1, an LED circuit board 2, a double light lamp 3, a red light guide column 4, a green light guide column 5 and a blue light guide column 6. The double light lamp 3 is installed near the reflection focus of the reflective cup 1, and the LED circuit board 2 is installed on the outer side of the tail of the reflective cup 1; the red light guide column 4, the green light guide column 5 and the blue light guide column 6 are distributed at 120° intervals with the double light lamp 3 as the center, and one end is connected to the light source in the LED circuit board 2, and the other end extends into the reflective cup 1. The structure of the double light lamp 3 is as shown in the attached manual Figure 3As shown, it is composed of a controller 31, a filament fixing column 32, a long-distance light filament 33, a short-distance light filament 34, a glass 35, a shading plate 36, and an independent space 37. The position relationship between the LED circuit board 2 and the light guide column is shown in the attached manual. Figure 6 As shown, the red LED lamp bead 21 is installed on the circuit board and embedded in the red light guide column 4, and the installation relationship between the green LED lamp bead 22 and the blue LED lamp bead 23 and the light guide column is the same as that of the red LED lamp bead 21.

[0026] Example 1

[0027] Select LED lamp beads with different color temperatures to be used in combination with the dual light lamp 3. The dual light lamp 3 is used as the main light source to provide lighting brightness. The red LED lamp beads 21 and the green LED lamp beads 22 are adjusted to a color temperature of 6000K and cooperate with a 3500K color temperature blue LED lamp bead 23 to emit an overall color temperature of 5500K; in foggy and rainy weather, the color temperature of the red LED lamp bead 21 is adjusted to 3000K, the green LED lamp bead 22 is adjusted to a color temperature of 5000K, and the color temperature of the blue LED lamp bead 23 is adjusted to 3500K. Together with the dual light lamp 3, they can emit an overall color temperature of 4000K light, enhancing the penetrating ability of light.

[0028] Example 2

[0029] When the dual light lamp 3 is in use, the driver can manually control the working state of the long-distance light filament 33 and the short-distance light filament 34. When the short-distance light filament 34 is turned on, the visor 36 located in the independent space 37 is at normal temperature at the beginning. Figure 4 The flat plate structure shown in the figure can block most of the light of the short-range light filament 34. At this time, the car headlight can only illuminate the position at a relatively close distance in front of the car. As the working time of the short-range light filament 34 increases, the ambient temperature in the independent space 37 begins to rise. With the increase in temperature, the memory alloy shading plate 36 with shape memory function begins to slowly change shape, and the two sides begin to roll toward the center, as shown in the attached manual. Figure 5 After the two sides of the shading plate 36 are rolled up, the shielding area of ​​the low-beam filament 34 is greatly reduced, and the change in the incident angle of the low-beam filament 34 causes the low-beam irradiation distance to be correspondingly extended, thereby achieving an increase in the low-beam irradiation distance.

[0030] The drawings in the manual are only schematic diagrams of the product structure and principle. The actual product structure and dimensions shall be subject to the design and production drawings.

[0031] The embodiments described above are merely descriptions of the implementation methods of the present invention, and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by ordinary persons in the art to the technical solution of the present invention should fall within the scope of protection of the present invention. The scope of the present invention is defined by the attached claims rather than the above description, and therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims within the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A car headlight with variable color temperature and adjustable focal length, comprising a reflector cup (1), an LED circuit board (2), a double light lamp (3), a red light guide column (4), a green light guide column (5) and a blue light guide column (6), characterized in that: The LED circuit board (2) is installed on the outside of the rear of the reflective cup (1); the dual light lamp (3) is installed near the reflection focus of the reflective cup (1); the red light guide column (4), the green light guide column (5) and the blue light guide column (6) are arranged at intervals of 120° with the dual light lamp (3) as the center of the circle, and one end is connected to the light source in the LED circuit board (2), and the other end extends into the interior of the reflective cup (1); The dual light lamp (3) is composed of a controller (31), a filament fixing column (32), a long-distance light filament (33), a short-distance light filament (34), a glass cover (35), a light shield (36), and an independent space (37). The short-distance light filament (34) and the long-distance light filament (33) are connected to the controller (31) via the filament fixing column (32). The shading plate (36) is made of a memory alloy material with a shape memory effect. It is a flat plate structure at room temperature, and its two sides are rolled toward the center at high temperature. The independent space (37) is located in the glass cover (35) on the upper side of the close-range light filament (34), and a boss structure is provided in the independent space (37), and a light shielding plate (36) is placed on the boss. The LED circuit board (2) is equipped with a red LED lamp bead (21), a green LED lamp bead (22) and a blue LED lamp bead (23). The red LED lamp bead (21), the green LED lamp bead (22) and the blue LED lamp bead (23) are respectively implanted at one end of the red light guide column (4), the green light guide column (5) and the blue light guide column (6). The side walls of the red light guide column (4), the green light guide column (5) and the blue light guide column (6) are coated with white reflective paint to reflect light with an angle less than the critical angle, thereby reducing the loss of the light source during the propagation process of the light guide column.

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