A brake light for a car

Abstract

The present invention relates to a brake light for an automobile, belonging to the technical field of brake lights. The brake light comprises a control module, a light source, a polarizing lens, and a semi-light-conducting strip. The polarizing lens and the semi-light-conducting strip are sequentially arranged along the optical path of the light source. The polarizing lens is used to diverge the light emitted from the light source. A polarizing plate is arranged between the polarizing lens and the semi-light-conducting strip. The polarizing plate is electrically connected to the control module. The control module adjusts the divergence of the light emitted from the polarizing lens by instructing the polarizing plate to rotate. The control module is used to determine whether the vehicle speed exceeds a threshold. When the vehicle speed exceeds the threshold, the control module reduces the divergence of the light emitted from the light source by the polarizing lens. When the vehicle speed is below the threshold, the control module increases the divergence of the light emitted from the light source by the polarizing lens.

Description

Technical Field

[0001] The invention belongs to the technical field of brake lights, and in particular relates to a brake light for an automobile. Background Art

[0002] When a car brakes, it needs to send a signal to the rear so that vehicles or pedestrians behind it can see that the car in front is slowing down. Therefore, the car brake light is a tool used to send a light signal to the rear when the car brakes.

[0003] The lens body in a general high-mounted brake light is basically a double-layer structure, and the light transmission is prone to discontinuity, which affects the user experience. For this reason, Chinese patent application CN109724050A discloses a new three-layer Fresnel lens optical unit high-mounted brake light, including a lens body; the lens body includes a first layer lens, a second layer lens, and a third layer lens; the first layer lens is provided with a plurality of convex portions on the side facing the second layer lens, and there are intervals between the convex portions, and the other side of the first layer lens is provided with a patterned portion formed by a plurality of trapezoidal connections; the second layer lens is provided with a plurality of serrated portions on the side facing the first layer lens, and the second layer lens is provided with a wavy pattern on the side facing the third layer lens; the third layer lens is flat on the side facing the second layer lens, and is a convex surface protruding outward on the side facing the outside of the lens body. It has a simple structure, compact fit, easy use, reasonable design, and beautiful appearance; it is technically and economically efficient;

[0004] However, different light signals need to be transmitted in different situations. For example, when a vehicle is traveling at a higher speed, there is a greater probability that the vehicle is traveling on an open road, and the speed of surrounding vehicles is also high, so the braking distance is longer. When braking, it is necessary to give a braking reminder to vehicles as far away as possible, reminding the following vehicles to brake as far away as possible. At this time, there is no need to scatter the light. Instead, the light needs to be concentrated and emitted backwards to remind the following vehicles at a long distance. In normal times, the brake light needs to be scattered in all directions to improve the uniformity of the light. For this reason, a car brake light with an adjustable light scattering degree and good braking reminder effect is needed. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the present invention provides a brake light for an automobile, which has the characteristics of adjustable scattering degree and good braking prompt effect.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A brake light for an automobile, comprising a control module, a light source, a polarizing lens, and a semi-light-guiding strip, wherein the polarizing lens and the semi-light-guiding strip are sequentially arranged along the light path of the light source, and the polarizing lens is used to diverge the light emitted from the light source;

[0008] The semi-light-guiding strip comprises a sawtooth surface and a light-homogenizing surface sequentially arranged along the light path, wherein the sawtooth surface is used to make the light emitted from the polarizing lens parallel, and the light-homogenizing surface is used to homogenize the light emitted from the sawtooth surface in the horizontal and vertical directions;

[0009] A polarizing plate is provided between the polarizing lens and the semi-light-guiding strip. The polarizing plate is electrically connected to a control module. The control module adjusts the divergence of light emitted from the polarizing lens by instructing the polarizing plate to rotate. The control module is used to determine whether the vehicle speed exceeds a threshold. When the vehicle speed exceeds the threshold, the control module reduces the divergence of the polarizing lens on the light emitted from the light source. When the vehicle speed is below the threshold, the control module increases the divergence of the polarizing lens on the light emitted from the light source.

[0010] As a preferred technical solution of the present invention, the polarizing lens includes a concave lens, a primary polarizing hole and a secondary polarizing hole arranged along the light path. The concave lens is used to diverge the light entering the polarizing lens, the primary polarizing hole is used to diverge the light emitted from the concave lens, and the secondary polarizing hole is used to further diverge the light emitted from the primary polarizing hole. There are two polarizing plates, which are respectively arranged on both sides of the light exit surface of the polarizing lens to adjust the divergence degree of the light emitted from the polarizing lens.

[0011] As a preferred technical solution of the present invention, the control module is pre-input with a standard vehicle speed V0, and the polarizing plate is pre-input with a standard tilt angle. The rotation direction of the polarizing plate to make the reflected light close to the center of the first polarizing hole is used as a reference direction. The control module instructs the angle of the polarizing plate to tilt A° toward the reference direction with the standard tilt angle as the origin, where A=V / V0×c, and c is a pre-input constant.

[0012] As a preferred technical solution of the present invention, the control module is also electrically connected to a visibility sensor. The control module obtains visibility through the visibility sensor and determines whether the reflectivity exceeds a threshold value. When the judgment result is yes, the control module downwardly corrects the divergence degree of the polarizing lens to the light emitted by the light source. When the judgment result is no, the control module upwardly corrects the divergence degree of the polarizing lens to the light emitted by the light source.

[0013] As a preferred technical solution of the present invention, the control module obtains visibility F through a visibility sensor, and the control module instructs the angle of the polarizing plate to tilt A×A1° toward the reference direction with the standard tilt angle as the origin, where A1=F0 / F×d, and F0 and d are pre-input constants.

[0014] As a preferred technical solution of the present invention, a control panel is provided, which is electrically connected to the control module and is used to display the tilt angle of the polarizing plate relative to the standard tilt angle.

[0015] As a preferred technical solution of the present invention, a light collecting plate is provided between the polarizing lens and the light source, and the light collecting plate is used to collect the light emitted by the light source and allow the concentrated light to enter the polarizing lens.

[0016] As a preferred technical solution of the present invention, a pattern is etched on the surface of the light collecting plate on the side close to the polarizing lens.

[0017] The beneficial effects of the present invention are:

[0018] (1) By setting a polarizing lens and a semi-light-guiding strip to diverge and evenly distribute the light from a single LED light source, a relatively uniform illumination effect can be obtained without setting up multiple LED light sources to form an array, and a light signal can be emitted in the direction required by the designer, completing the basic functions of the brake light while reducing power consumption and structural complexity;

[0019] (2) By making the control module reduce the divergence of the polarized lens on the light emitted by the light source when the vehicle speed exceeds the threshold, and increase the divergence of the polarized lens on the light emitted by the light source when the vehicle speed is below the threshold, the light needs to be concentrated and emitted backward when the vehicle is traveling at a higher speed. When the vehicle is alerting the rear vehicle at a long distance, the light is concentrated and the light propagation distance is increased, thereby increasing the prompt distance. When the vehicle speed is low and the scattering range needs to be expanded to alert more people, the light propagation range is increased;

[0020] (3) By making the control module correct the divergence of the polarized lens to the light emitted by the light source downward when it is judged that the visibility is too low, and correct the divergence of the polarized lens to the light emitted by the light source upward when it is above the threshold, the light can be further concentrated and the light penetration can be improved when the weather conditions are poor and the visibility is low, thereby increasing the light propagation distance. When the visibility is good and there is no need to sacrifice the lighting range to increase the propagation distance, the light propagation range can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] To facilitate understanding by those skilled in the art, the present invention is further described below with reference to the accompanying drawings.

[0022] Figure 1 It is a structural schematic diagram of the present invention;

[0023] Figure 2 Schematic diagram of the structure of the polarized lens of the present invention;

[0024] Figure 3 Schematic diagram of the optical path of the polarizing lens of the present invention;

[0025] Figure 4 Schematic diagram of the optical path of the polarizer after it is rotated away from the reference direction according to the present invention;

[0026] Description of main component symbols:

[0027] In the figure: 1. Polarizing lens; 11. Concave lens; 12. First polarizing hole; 13. Second polarizing hole; 14. Polarizing plate; 2. Semi-light-guiding strip; 21. Sawtooth surface; 22. Light-uniform surface; 23. Light-collecting plate. DETAILED DESCRIPTION

[0028] In order to further illustrate the technical means and effects adopted by the present invention to achieve the predetermined purpose of the invention, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0029] See also Figure 1-4 A brake light for an automobile includes a control module, a light source, a polarizing lens, and a semi-light-guiding strip, wherein the polarizing lens and the semi-light-guiding strip are sequentially arranged along the light path direction of the light source, and the polarizing lens is used to diverge the light emitted from the light source;

[0030] Specifically, the light source is an LED light-emitting chip, which is electrically connected to a control module. The control module instructs the light source to start and stop. The light-emitting surface of the light source is arranged directly opposite the light incident surface of the polarizing lens, so that the light emitted by the light source can enter the light incident surface of the polarizing lens.

[0031] The semi-light guide strip is a rectangular plate structure. One bottom surface of the rectangular plate structure semi-light guide strip is set towards the light-emitting surface of the polarizing lens, and the other bottom surface is the light-emitting surface of the brake light.

[0032] After the light enters the polarizing lens, it is diverged by the polarizing lens and diffuses outward. Then, the scattered light reaches all parts of the light incident surface of the semi-light-guiding strip.

[0033] Because it is necessary to ensure that light is evenly emitted from the entire light-emitting surface of the brake light, after the light is diverged by the polarizing lens, if it is not converged and parallelized, most of the light will continue to propagate in a straight line and will not be able to propagate to the light-emitting surface of the semi-light-guiding strip. Instead, it will illuminate the surrounding structures where the brake light is fixed and be absorbed by the surrounding structures, resulting in poor lighting effect. Therefore, the semi-light-guiding strip first converges the light into parallel light, so that the light reaching each part of the light-entering surface of the semi-light-guiding strip becomes perpendicular to the light-entering surface. At the same time, because the semi-light-guiding strip is a plate-shaped structure, the light perpendicular to the light-entering surface can be emitted in a direction perpendicular to the light-emitting surface, completing the convergence of the scattered light by the semi-light-guiding strip.

[0034] After being folded, the light distribution in some spaces of the semi-light-guiding strip is denser, while the light distribution in some spaces is sparser. At this time, the lighting uniformity is still poor, and the light needs to be evened out. The semi-light-guiding strip is provided with a wave pattern layer and a convex layer along the direction of light propagation. The wave pattern layer is used to even out the light horizontally, and the convex layer is used to even out the light vertically.

[0035] For the polarized lens, specifically, the cross-section of the polarized lens is trapezoidal as a whole, the short flat side of the trapezoidal polarized lens is the light incident surface, which is arranged toward the light source, the long flat side is the light exit surface, which is arranged toward the semi-light-guiding strip, and the surface shape of the light exit surface is arranged to be corrugated. At the same time, a concave lens is arranged on the side of the polarized lens close to the light incident surface, the plane incident surface of the concave lens coincides with the light incident surface of the polarized lens, forming the light incident surface of the polarized lens, and the light exit concave surface faces the light exit surface. Inside the polarized lens, a primary polarizing hole and a secondary polarizing hole are sequentially arranged along the propagation direction of light, the light incident surface of the primary polarizing hole is arranged toward the light exit concave surface of the concave lens, the light exit surface is arranged toward the light incident surface of the secondary polarizing hole, and the light exit surface of the secondary polarizing hole is arranged toward the light exit surface of the polarized lens. The arrangement positions of the primary polarizing hole and the secondary polarizing hole ensure that the light is scattered by the concave lens and then incident on the light incident surface of the primary polarizing hole, and the light is emitted from the primary polarizing hole and then incident on the light incident surface of the secondary polarizing hole.

[0036] The primary polarizing hole includes polarizing plane 1 and polarizing plane 2 set along the light path. The light enters the secondary polarizing hole after being deflected by polarizing plane 1 and polarizing plane 2. The function of polarizing plane 1 is to deflect the light, and the function of polarizing plane 2 is to diffuse the light.

[0037] At the same time, there are a total of several secondary polarizing holes, which are distributed between the primary polarizing hole and the light exit surface of the polarizing lens. Each secondary polarizing hole is also provided with a polarizing plane 1 and a polarizing plane 2. The secondary polarizing holes close to the edge of the polarizing lens are used to scatter part of the light to the sides of the polarizing lens, and part of the light is scattered toward the center of the polarizing lens. The secondary polarizer located at the center of the polarizing lens is used to scatter the light to both sides. At this time, several light rays can be more evenly distributed on both sides and the center of the light exit surface of the polarizing lens, completing the scattering of the polarizing lens.

[0038] Compared to the solution of directly setting up multiple LED light sources, the use of polarizing lenses and semi-light-guiding strips to diverge and evenly distribute the light from a single LED light source eliminates the need to set up multiple LED light sources to form an array. This allows for a more uniform illumination effect, emitting light signals in the direction required by the designer, completing the basic functions of a brake light while reducing power consumption and structural complexity.

[0039] When the brake lights in the above-mentioned scheme are actually used, different light signals need to be transmitted in different situations. For example, when a vehicle is traveling at a high speed, there is a high probability that the vehicle is traveling on an open road, and the speed of surrounding vehicles is also high, resulting in a long braking distance. When braking, it is necessary to provide a braking warning to vehicles as far away as possible, reminding the following vehicles to brake as far away as possible. In this case, there is no need to scatter the light. Instead, the light needs to be concentrated and emitted backward to warn the following vehicles at a long distance. In normal circumstances, the brake light needs to be scattered in all directions to improve the uniformity of the light. To this end, the degree of light scattering needs to be adjusted. To this end, a polarizing plate is provided between the polarizing lens and the semi-conductive strip. The polarizing plate is electrically connected to the control module. The control module adjusts the divergence of the light emitted from the polarizing lens by instructing the polarizing plate to rotate. The control module is used to determine whether the vehicle speed exceeds a threshold. When the vehicle speed exceeds the threshold, the control module reduces the divergence of the light emitted from the light source by the polarizing lens. When the vehicle speed is below the threshold, the control module increases the divergence of the light emitted from the light source by the polarizing lens.

[0040] Specifically, since the polarizing lens is in the shape of a quadrangular prism with a trapezoidal cross-section, and its two parallel surfaces are respectively the light entrance surface and the light exit surface, the light scattering direction is to diffuse outward along the extension direction of the two inclined surfaces of the polarizing lens. Therefore, when it is necessary to converge the light, a line perpendicular to the center point of the light exit surface of the polarizing lens is used as a reference line, and the light along the extension direction of the two inclined surfaces needs to be converged toward the reference line, that is, a reflector is provided on the extension plane of the two inclined surfaces, and the angle of the reflector relative to the light exit surface of the polarizing lens is adjustable. To this end, each polarizing plate includes an electric rotating shaft, the axis center lines of the two rotating shafts are perpendicular to the reference line, and the axis center line of each polarizing plate rotating shaft is respectively located on a plane extending in the direction of the inclined surface toward the semi-light guide strip. The polarizing plate is provided on the extension plane of the two inclined surfaces of the polarizing lens. At this time, the light diffused along the extension plane of the two inclined surfaces contacts the polarizing plate;

[0041] In this embodiment, the polarizing plate is a reflector and the light diffused along the extended plane of the two inclined surfaces contacts the polarizing plate, is reflected and propagates toward the reference line;

[0042] When it is necessary to reduce the degree of scattering and focus the light on the reference line, the angle between the light and the polarizer needs to be increased so that the light can deviate from the original diffusion direction along the extension plane of the two inclined surfaces and turn towards the reference line. At this time, it is necessary to move the polarizer closer to a state perpendicular to the light exit surface of the polarizing lens. At this time, the control module instructs the polarizer to turn closer to a state perpendicular to the light exit surface of the polarizing lens.

[0043] When the degree of scattering needs to be increased so that the light diffuses along the extended plane of the two inclined surfaces, the angle between the light and the polarizer needs to be reduced to reduce the degree to which the light deviates from the original propagation direction. In this case, the polarizer needs to be moved away from the state perpendicular to the light exit surface of the polarizing lens. At this time, the control module instructs the polarizer to move away from the state perpendicular to the light exit surface of the polarizing lens.

[0044] Specifically, the control module is pre-input with a standard vehicle speed V0, and the polarizer is pre-input with a standard tilt angle. The polarizer rotates in a direction that causes the reflected light to approach the center of the first polarizing hole as a reference direction. The control module instructs the polarizer to tilt A° toward the reference direction with the standard tilt angle as the origin, where A=V / V0×c, and c is a pre-input constant.

[0045] When the vehicle speed V is high and the scattering degree needs to be reduced, the value of A=V / V0×c is large. When the control module instructs the polarizer to tilt A° in the reference direction with the standard tilt angle as the origin, the polarizer is instructed to turn closer to the state perpendicular to the light-emitting surface of the polarizing lens when the scattering degree needs to be reduced.

[0046] When the vehicle speed V is low and the scattering degree needs to be maintained or increased, the value of A=V / V0×c is small. When the control module instructs the polarizer to tilt by A° in the reference direction with the standard tilt angle as the origin, the polarizer is instructed to turn away from the state perpendicular to the light-emitting surface of the polarizing lens when the scattering degree needs to be maintained or increased.

[0047] By enabling the control module to reduce the divergence of the polarized lens on the light emitted by the light source when the vehicle speed exceeds a threshold, and to increase the divergence of the polarized lens on the light emitted by the light source when the vehicle speed is below the threshold, the system can achieve the goal of concentrating the light and emitting it backwards when the vehicle is traveling at a higher speed. When reminding the rear vehicle at a long distance, the light can be concentrated to increase the light propagation distance, thereby increasing the warning distance. When the vehicle speed is low and the scattering range needs to be expanded to remind more people, the light propagation range can be increased.

[0048] Since the coverage range of a single light source is still limited after divergence, parallelization and uniform light, in actual use, several brake lights can be optionally set up, and several brake lights can be arranged along the design direction to form a brake light array to achieve the lighting effect required by the designer.

[0049] In some cases, weather may also affect the light propagation distance and the warning distance of the brake lights. When weather conditions are poor, foggy, and visibility is low, it is necessary to further concentrate the light to improve light penetration, thereby increasing the light propagation distance. When weather conditions are good and visibility is high, there is no need to sacrifice the lighting range to increase the propagation distance. To this end, the control module is also electrically connected to a visibility sensor. The control module obtains visibility through the visibility sensor and determines whether the reflectivity exceeds a threshold. If the judgment result is yes, the control module downwardly corrects the divergence degree of the polarized lens on the light emitted by the light source. If the judgment result is no, the control module upwardly corrects the divergence degree of the polarized lens on the light emitted by the light source.

[0050] Specifically, the visibility sensor is used to detect the propagation distance of the brake light wavelength in the current environment in real time, obtain the visibility F, and upload it to the control module once per second. After receiving the data, the control module instructs the polarizer to tilt A×A1° toward the reference direction with the standard tilt angle as the origin, where A1=F0 / F×d, and F0 and d are pre-entered constants.

[0051] When the visibility F is low, it means that the light needs to be further concentrated, and the angle of the polarizer tilted toward the reference direction with the standard tilt angle as the origin needs to be increased. At this time, the value of A1=F0 / F×d is large, and the value of A×A1° is large. When the control module instructs the polarizer to tilt the angle of A×A1° toward the reference direction with the standard tilt angle as the origin, the polarizer is tilted toward the reference direction with the standard tilt angle as the origin when the light needs to be further concentrated.

[0052] When the visibility F is high, it means that there is no need to further concentrate the light and there is no need to increase the tilt angle of the polarizer relative to the reference direction with the standard tilt angle as the origin. At this time, the value of A1=F0 / F×d is small, and the value of A×A1° is small. When the control module instructs the polarizer to tilt the angle of A×A1° relative to the reference direction with the standard tilt angle as the origin, the polarizer is tilted relative to the reference direction with the standard tilt angle as the origin, thereby reducing the tilt angle of the polarizer relative to the reference direction with the standard tilt angle as the origin when there is no need to further concentrate the light.

[0053] By causing the control module to correct downward the divergence of the polarized lens on the light emitted by the light source when it determines that the visibility is too low, and to correct upward the divergence of the polarized lens on the light emitted by the light source when it is above a threshold, the light can be further concentrated and the light penetration can be improved when the weather conditions are poor and the visibility is low, thereby increasing the light propagation distance. When the visibility is good and there is no need to sacrifice the lighting range to increase the propagation distance, the light propagation range can be improved.

[0054] In order to remind passengers or drivers of the current brake light status, a control panel is also included. The control panel is electrically connected to the control module and is used to display the tilt angle of the polarizer relative to the standard tilt angle.

[0055] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, make some changes or modifications to equivalent embodiments using the technical contents disclosed above. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A brake light for an automobile, characterized in that: It includes a control module, a light source, a polarizing lens and a semi-light-guiding strip, wherein the polarizing lens and the semi-light-guiding strip are sequentially arranged along the light path direction of the light source, and the polarizing lens is used to diverge the light emitted from the light source; The semi-light-guiding strip comprises a sawtooth surface and a light-homogenizing surface sequentially arranged along the light path, wherein the sawtooth surface is used to make the light emitted from the polarizing lens parallel, and the light-homogenizing surface is used to homogenize the light emitted from the sawtooth surface in the horizontal and vertical directions; A polarizing plate is provided between the polarizing lens and the semi-light-guiding strip, the polarizing plate being electrically connected to a control module. The control module adjusts the divergence of light emitted from the polarizing lens by instructing the polarizing plate to rotate. The control module is configured to determine whether the vehicle speed exceeds a threshold. When the vehicle speed exceeds the threshold, the control module reduces the divergence of light emitted from the light source by the polarizing lens. When the vehicle speed is below the threshold, the control module increases the divergence of light emitted from the light source by the polarizing lens. The polarizing lens includes a concave lens, a primary polarizing hole, and a secondary polarizing hole arranged along the light path. The concave lens is used to diverge the light incident on the polarizing lens, the primary polarizing hole is used to diverge the light emitted from the concave lens, and the secondary polarizing hole is used to further diverge the light emitted from the primary polarizing hole. There are two polarizing plates, which are respectively arranged on both sides of the light exiting surface of the polarizing lens to adjust the divergence degree of the light emitted from the polarizing lens. The control module is pre-input with a standard vehicle speed V0, and a standard tilt angle is pre-input with the polarizer. The rotation direction of the polarizer so that the reflected light approaches the center of the first polarizing hole is used as a reference direction. The control module instructs the polarizer to tilt A° toward the reference direction with the standard tilt angle as the origin, where A=V / V0×c, and c is a pre-input constant. The control module is further electrically connected to a visibility sensor. The control module obtains visibility through the visibility sensor and determines whether the reflectivity exceeds a threshold value. If the determination result is yes, the control module corrects downward the divergence degree of the polarizing lens on the light emitted by the light source. If the determination result is no, the control module corrects upward the divergence degree of the polarizing lens on the light emitted by the light source. The control module obtains visibility F through the visibility sensor, and instructs the angle of the polarizer to tilt A×A1° toward the reference direction with the standard tilt angle as the origin, where A1=F0 / F×d, and F0 and d are pre-input constants.

2. The automobile brake light according to claim 1, characterized in that: The device comprises a control panel, which is electrically connected to the control module and is used to display the tilt angle of the polarizing plate relative to the standard tilt angle.

3. The automobile brake light according to claim 1, characterized in that: A light collecting plate is provided between the polarizing lens and the light source, and the light collecting plate is used to collect the light emitted by the light source and allow the concentrated light to enter the polarizing lens.

4. The automobile brake light according to claim 3, characterized in that: The surface of the light collecting plate close to the polarizing lens is etched with patterns.

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