1. Field of the Invention
This invention relates to a headlamp and/or a tail light assembly and a heater and heating system, apparatus and method for use in a headlamp and/or a tail light assembly.
2. Description of the Related Art
Vehicles function in a range of environments and often encounter condensation or ice forming on surfaces of the various components of the vehicle, including the headlamp components. Ice buildup on exterior vehicle components, such as the headlamps and rear lights, is a common problem. A typical headlamp and/or a tail light assembly comprises an outer housing that receives a reflector. The reflector has a light source, such as the LED or a discharge lamp, for example. The housing is typically closed at the front by glass or plastic constituting a transparent cover or outer lens, which allows the emergence therethrough of light produced by the light source and reflected by the reflector. The optical members, such as the reflector or similar apparatus, are placed within the chamber forming a light beam from the light produced by the light source.
The housing also houses the additional accessories and/or additional means necessary for the operation of the headlamp and/or a tail light assembly, such as the electronic circuits and controls for controlling the operation of the headlamp and/or means for its mobility, wiring or the like. Such accessories and complementary means are deemed unsightly and are therefore housed within an interior compartment formed at the base of the housing. Also, the direct visual access to the housing wall is often detrimental to the overall appearance and aesthetics of the headlamp and/or a tail light assembly as it is often designed in a material that is unattractive to the eye. To prevent visual access to the external supplementary means and/or the inner components within the housing through the transparent cover or outer lens, an inner mass or bezel is placed at the base of the transparent cover or outer lens to cover those components.
The housing is configured so as to be sealed against water penetration, such as water run-off from other components of the vehicle, while being permeable to air to allow ventilation of the interior thereof. This ventilation is necessary due to the heat generated by the light source, which requires balancing the pressure between the inside and the outside of the housing. Such sealing and permeability of the housing are, for example, obtained by means of, for example, labyrinth baffles or other valves or apertures.
Vehicles are typically designed with a pair of headlamps and a pair of rear lamps. Condensation and ice buildup on the vehicle light assemblies is quite common. In the past, headlamps were based on incandescent bulb technology, an example being halogen bulbs. Halogen bulbs were placed within an enclosure having a cover and light generated by the bulbs was directed out through the cover. Halogen bulbs generate heat along with the light. Although generating some heat, this heat was not sufficiently effective to prevent the formation of condensation on the cover. To improve illumination efficiency one or more light-emitting diodes (“LED”) were designed to replace the halogen bulbs and other light sources. LEDs provide beneficial reduction in power consumption and generally last longer than other types of light sources, but do not generate sufficient heat to prevent the accumulation of condensation on the inside of the transparent cover or outer lens of the headlamp and/or a tail light assembly. In addition, due to packing requirements and attempts to increase efficiency and aesthetics, the amount of air flowing through the headlamp enclosure has been substantially reduced. Therefore, substantial condensation issues exist, including not only the unsightly formation of condensation, but also the potential for reduced driver visibility. Similar issues have caused ice formation on the transparent covers or outer lenses of the headlamp and/or a tail light assembly.
In the case of condensation, warmer air can hold more moisture than colder air, thus the combination of relatively warm moist air with a cooler surface tends to generate condensation on the cooler surface. While it is possible for condensation to form on many parts of the vehicle, condensation is most noticeable and aesthetically objectionable on transparent surfaces, such as the vehicle windshield and, for example, on the transparent cover or outer lens of the vehicle headlamps. Condensation tends to form on surfaces like the transparent cover or outer lens for the headlamps because interior air is relatively warm and moist while the transparent cover or outer lens itself on the outer surface is relatively cool due to the flow of cool exterior air over the transparent cover or outer lens. Once the relatively warm and moist interior air contacts the inner surface of the transparent cover or outer lens, it tends to cool and condense on the inside of the transparent cover or outer lens. Methods of controlling the formation of condensation (i.e., causing the condensation to evaporate) include lowering the level of moisture in the interior air, increasing the airflow across the inside surface of the transparent cover or outer lens and further heating the air.
Condensation of moisture on the transparent cover or outer lens is not desirable not only when the headlamp is in operation, but also when the vehicle is stopped and the light source is turned off. To prevent fogging of the glass cover, it was previously proposed to heat the glass cover by integrating in the glass cover heating elements such as resistors, electrode, heating film or the like. Unfortunately, such provisions have the disadvantage of altering the optical quality of the transparent glass cover or outer lens for projection of the light beam from the light source to induce an increase in the cost of inappropriate glass or transparent cover and outer lens and generate electrical consumption.
To avoid the use of the electrical energy, it was proposed to use the heat generated by the light source to heat the glass cover, as described in DE 10255443. A stream of hot air generated by the heat present in the chamber is directed towards the inner face of the transparent cover or outer lens so as to be scanned by the heat. Such provisions are unsatisfactory to the extent that their implementation is subject to the waste heat produced by the light source, and therefore, they may not be able to meet when the heat is inadequate or non-existent at all. Such a solution is more applicable to a restricted type of light source capable of producing sufficient heat, such as a discharge lamp or halogen lamp. In many cases with the light source utilizing LEDs, not enough heat is generated to provide sufficient hot airflow. In addition, the formation of passages of hot airflow through the mask prejudice to its primary function of having to hide the components of the headlamp and/or a tail light assembly and therefore reduce the overall aesthetics of the headlamp.
Another approach to reducing moisture is shown in DE 10319363. A thermal electric unit is activated depending on weather conditions, including rain and outdoor temperatures. The use of the thermal active unit is satisfactory in view of the lower power consumption required for its implementation. However, such provisions of causing condensation in a dedicated area of the housing are insufficient to ensure preservation of reducing or elimination of ice and fog. These provisions do not allow for fast and efficient de-misting or de-icing and/or condensation removal and the prior implementation of the thermal electric unit does not meet users' expectations.
Existing solutions for de-icing and eliminating condensation to the transparent cover or outer lens to reduce the humidity inside the headlamp and/or a tail light assembly are not satisfactory with regard to all requirements, including cost of obtaining and/or limiting operation of the device used, its small footprint in the overall headlamp and/or a tail light assembly and of providing a de-icer that is effective to achieve quick condensation removal and de-icing that improves the overall operation of the headlamp and/or a tail light assembly and perhaps provides improved visibility to the driver.
What is needed, therefore, is an assembly, system and method that facilitates reducing condensation and providing a system, means and method for de-icing a headlamp and/or a tail light assembly.
It is, therefore, an object of the invention to provide a heater for a headlamp and/or a tail light assembly that is adapted to reduce and/or eliminate condensation that is capable of de-icing the transparent cover or outer lens of the headlamp and/or a tail light assembly.
Another object of the invention is to provide a headlamp and/or a tail light assembly having a heater that is adapted to reduce and/or eliminate condensation and that is capable of de-icing the transparent cover or outer lens of the headlamp and/or a tail light assembly.
Still another object of the invention is to provide a heater for use in a headlamp and/or a tail light assembly that comprises a deflector or reflector that is adapted to deflect and/or direct heat to an inner surface of the transparent cover or outer lens.
Yet another object of the invention is to provide a system and method for reducing condensation on the inner surface of the transparent cover or outer lens and/or de-icing the transparent cover or outer lens even during times when a light source in the headlamp and/or a tail light assembly is not on.
Still another object of the invention is to provide a headlamp and/or a tail light assembly having a heater unit that comprises a deflector having a deflective or reflective surface that is slightly angled to facilitate directing heat toward the inner surface of the transparent cover or outer lens.
Another object of the invention is to provide a heater having a deflector or reflector that houses the heater core such that when the deflector or reflector is mounted to a component of the headlamp and/or a tail light assembly, such as a bezel, the deflector or reflector becomes situated in a predetermined relationship with respect to the transparent cover or outer lens to facilitate directing heat toward the inner surface of the transparent cover or outer lens.
Another object of the invention is to provide a heater having a deflector or reflector that becomes situated a predetermined distance from an inner surface of the transparent cover or outer lens after it is mounted in the headlamp and/or a tail light assembly.
In one aspect, one embodiment of the invention comprises a headlamp and/or a tail light assembly comprising a housing, an outer lens and a heater having a heater core for producing heat, a deflector or reflector for receiving the heater core, the deflector or reflector being configured to direct or reflect heat from the heating core toward the outer lens.
In another aspect, another embodiment of the invention comprises a method for heating a outer lens in a headlamp and/or a tail light assembly comprising the steps of providing a heater having a heater core for producing heat, a deflector or reflector for receiving the heater core and mounting the heater in the headlamp and/or a tail light assembly such that the deflector or reflector directs heat toward an inner surface of an outer lens of the headlamp and/or a tail light assembly.
In still another aspect, another embodiment of the invention comprises a heater for use in a headlamp and/or a tail light assembly comprising a heater core for producing heat, a deflector or reflector for receiving the heater core, the deflector or reflector being configured to direct or reflect heat from the heating core toward an outer lens.
This invention, including all embodiments shown and described herein, could be used alone or together and/or in combination with one or more of the features covered by one or more of the claims set forth herein, including but not limited to one or more of the features or steps mentioned in the following bullet list and the claims.
The headlamp and/or a tail light assembly wherein the deflector or reflector comprises an angled, curved or non-linear wall portion for directing or reflecting heat from the heater core to the outer lens.
The headlamp and/or a tail light assembly wherein the deflector or reflector comprises a first wall and a generally opposing second wall; at least one of the first wall or the second wall being angled or curved to direct or reflect heat from the heater core toward the outer lens.
The headlamp and/or a tail light assembly wherein each of the first wall and the generally opposing second wall are angled or curved to direct or reflect heat from the heater core toward the outer lens.
The headlamp and/or a tail light assembly wherein the deflector or reflector is generally U-shaped, V-shaped or L-shaped in cross section and further comprises a joining wall for joining a first wall and a second wall and cooperating therewith to provide or define a receiving area for receiving the heater core.
The headlamp and/or a tail light assembly wherein the heater is mounted on the housing.
The headlamp and/or a tail light assembly wherein the headlamp and/or a tail light assembly comprises a bezel having a recessed wall defining a bezel recessed area for receiving the heater.
The headlamp and/or a tail light assembly wherein the deflector or reflector comprises a deflector housing for receiving the heater core, the deflector housing being configured and adapted to be receiving in the bezel recessed area.
The headlamp and/or a tail light assembly wherein the deflector or reflector comprises a deflector housing having a wall that is curved, non-linear or angled at a predetermined angle to direct heat toward the outer lens.
The headlamp and/or a tail light assembly wherein the angle is about 45 degrees.
The headlamp and/or a tail light assembly wherein the deflector or reflector comprises a deflector housing having a wall edge in opposed and operative relationship with an inner surface of the outer lens.
The headlamp and/or a tail light assembly wherein the wall edge is spaced from the inner surface a distance of 10.0 mm or less.
The headlamp and/or a tail light assembly wherein the deflector housing comprises a first wall having a first wall edge associated with a first area of the outer lens and a second wall edge associated with a second area of the outer lens; the second edge being spaced a predetermined distance from the second area to define an opening between the second edge and the outer lens to facilitate the passing of convection currents across an inner surface of the outer lens.
The headlamp and/or a tail light assembly wherein the first edge is spaced a second predetermined distance from the first area.
The headlamp and/or a tail light assembly wherein the second wall is angled to direct or reflect heat from the heater core toward the opening.
The headlamp and/or a tail light assembly wherein the predetermined distance is less than 10.0 mm.
The headlamp and/or a tail light assembly wherein at least an inner surface of the deflector housing is metallized or the deflector or reflector is made of a metallic material.
The headlamp and/or a tail light assembly wherein the deflector or reflector comprises a deflector housing that is secured to the outer lens.
The headlamp and/or a tail light assembly wherein the deflector or reflector housing is molded to the outer lens.
The headlamp and/or a tail light assembly wherein the deflector or reflector comprises a deflector housing that is secured to the outer lens.
The headlamp and/or a tail light assembly wherein the heater core is coupled to an electrical circuit for energizing the heater core.
The headlamp and/or a tail light assembly wherein the heater core comprises a mandrel for receiving and supporting a heating element.
The headlamp and/or a tail light assembly wherein the mandrel is generally cylindrical .
The headlamp and/or a tail light assembly wherein the heating element is a helically-shaped wire situated on the mandrel.
The headlamp and/or a tail light assembly wherein the mandrel is generally planar and comprises a plurality of channels for receiving a heating element for generating heat in response to current from an electrical circuit.
The headlamp and/or a tail light assembly wherein the mandrel is generally planar and comprises grooves for receiving the heating element.
The headlamp and/or a tail light assembly wherein the deflector or reflector is generally U-shaped, L-shaped or V-shaped in cross section and defines a deflector opening, the deflector or reflector being mounted in the headlamp and/or a tail light assembly such that the deflector opening is in operative relationship with the outer lens so that heat from the heater core is directed to the outer lens.
The headlamp and/or a tail light assembly wherein the heating element is a wire.
The headlamp and/or a tail light assembly wherein the outer lens comprises a convex or curved shape that defines a recessed area in the outer lens, the deflector or reflector having a housing that having an opening which generally opposes the recessed area.
The headlamp and/or a tail light assembly wherein the curved shape of the outer lens has two sides: one concave side which is the recessed area opposed to the opening of the deflector or reflector housing, and one convex side located inside a recess of the headlamp housing. This shape enables the positioning of the outer lens inside the headlamp housing before fixing the outer lens to the housing. This specific embodiment uses the other side of this shape by placing the deflector or reflector housing. It provides two technical functions to this area: on one side the said positioning and on the other side defining the cavity for placing the rod and the air pathway towards this cavity.
The headlamp and/or a tail light assembly wherein the heater is situated in the housing in opposed relationship to the recessed area.
The headlamp and/or a tail light assembly wherein the deflector or reflector comprises a deflector or reflector housing that is adapted to complement a shape of the outer lens in order to define an air channel that extends from below the deflector or reflector housing, generally horizontally or generally perpendicular toward the outer lens, then generally vertically upward or generally parallel to and across at least one surface of the outer lens.
The headlamp and/or a tail light assembly wherein the deflector or reflector comprises a deflector or reflector housing having a plurality of surfaces that are adapted to define a predetermined deflector or reflector shape or configuration, the outer lens having a predetermined outer lens shape or configuration, the predetermined deflector or reflector shape or configuration cooperating with the predetermined outer lens shape or configuration to define an air channel or passageway that has a generally vertical area in communication with a generally horizontal area for directing air toward a outer lens recessed area defined by the outer lens, the air channel or passageway also having a generally vertical area for directing air away from the outer lens recessed area and across a surface of the outer lens after it is heated by the heater.
The headlamp and/or a tail light assembly wherein the outer lens comprises a convex or curved shape that defines the outer lens recessed area, the deflector or reflector having a housing wall defining an opening which generally opposes the recessed area.
The method for heating an outer lens in a headlamp and/or a tail light assembly wherein the deflector or reflector is generally U-shaped, L-shaped or V-shaped in cross section and defines a deflector opening, the mounting step further comprising the step of mounting the deflector or reflector in the headlamp and/or a tail light assembly such that the deflector opening is situated in generally opposed and spaced relationship from the inner surface of the outer lens.
The method for heating an outer lens in a headlamp and/or a tail light assembly wherein the deflector or reflector comprises a wall having an edge surface that cooperates with the inner surface of the outer lens to define a current gap through which a convection current may pass, a distance between the edge surface and the inner surface being at least 10.0 mm.
The heater for use in a headlamp and/or a tail light assembly wherein the deflector or reflector comprises an angled or curved wall portion configured to direct or reflect heat from the heater core to the outer lens or transparent cover.
The heater for use in a headlamp and/or a tail light assembly wherein the deflector or reflector comprises a first wall and a generally opposing second wall; at least one of the first wall or the second wall defining the angled or curved wall portion configured to direct or reflect heat from the heater core toward the outer lens or transparent cover.
The heater for use in a headlamp and/or a tail light assembly wherein each of the first wall and the generally opposing second wall are angled to direct or reflect heat from the heater core toward the outer lens or transparent cover.
The heater for use in a headlamp and/or a tail light assembly wherein the deflector or reflector is generally U-shaped, V-shaped or L-shaped in cross section and further comprises a joining wall for joining a first wall and a second wall and cooperating therewith to provide or define a receiving area for receiving the heater core.
The heater for use in a headlamp and/or a tail light assembly wherein the heater is mounted on a bezel of the headlamp and/or a tail light assembly.
The heater for use in a headlamp and/or a tail light assembly wherein the bezel comprises a recessed wall defining a bezel recessed area for receiving the heater.
The heater for use in a headlamp and/or a tail light assembly wherein the deflector or reflector comprises a deflector or reflector housing for receiving the heater core, the deflector or reflector housing being configured and adapted to be receiving in the bezel recessed area.
These and other objects and advantages of the invention will be apparent from the following description, the accompanying drawings and the appended claims.
Referring now to
The headlamp and/or a tail light assembly 10 further comprises a transparent cover or outer lens 22 that is conventionally secured to the housing 12. In the illustration being described, the transparent cover or outer lens 22 is an outer lens of the headlamp and/or a tail light assembly 10. It should be understood that once the headlamp and/or a tail light assembly 10 is assembled, the heater 20 becomes hidden from view and operatively associated with the transparent cover or outer lens 22 so that when the heater 20 is energized, the heater 20 heats an inner surface 22a (
In one illustrative embodiment, the heater 20 is mounted on the bezel 16, but it could be integrally formed or molded thereon if desired. It should be understood, however, that the heater 20 could be mounted directly to or integrally formed on other components of the headlamp and/or a tail light assembly 10, such as the housing 12 or even the transparent cover or outer lens 22, although the preferred embodiment is to mount the heater 20 directly on the bezel 16 using the screws 25 (
In the illustration being described, the heater 20, when energized, facilitates de-icing and clearing condensation from the inner surface 22a and/or the outer surface 22b of the transparent cover or outer lens 22. Accordingly, it is desirable to situate the heater 20 in the headlamp and/or a tail light assembly 10 (e.g., the bezel 16) so that it is situated in relatively close proximity to the inner surface 22a of the transparent cover or outer lens 22 to increase a temperature and airflow in an area 24 (
Referring now to
The heater 20 further comprises a reflector or deflector 30 for receiving and supporting the heater core or mandrel 26 and heating element 28. In the illustration being described, the heater core or mandrel 26 is generally cylindrical and receives the helical shaped or formed heating element 28 as illustrated in
In one embodiment, the reflector or deflector 30 comprises a first wall portion 30a (
In one illustrative embodiment, the wall portions 30a-30e are about 2.0 mm thick and made of a thermally-conductive material, such as metal or plastic. These surfaces 30a-30e may be metallized to facilitate reflection or deflection of heat.
It is important to note that the transparent cover or outer lens 22 comprises a recessed wall portion 22a1 that defines the area 24 mentioned earlier herein. Note that the first wall portion 30a comprises the first edge 30a1 that generally opposes the area 24 and the wall portion 22a1 of the transparent cover or outer lens 22. In the illustration being described, the first edge 30a1 is a second predetermined distance (SPD) from the wall portion 22a1 as illustrated in
Thus, the reflector or deflector 30 comprises the housing 12 having a plurality of surfaces 30a, 30b and 30c that are adapted to define a predetermined deflector or reflector shape or configuration, which is generally U-shaped in the illustration shown in
As illustrated in
The reflector or deflector 30 comprises a generally planar mounting projection 40 that projects downwardly (as viewed in
Referring back to
Another advantageous feature of the illustration being described is that when the reflector or deflector 30 is mounted to the bezel 16, as illustrated in
It is important to note that the upper or second wall portion 30b is angled upward (as viewed in
It is important to note in
In the illustration being described, the reflector or deflector 30 is made of a metallic or thermally-conductive material approximately 2.0 mm thick as mentioned earlier, but the wall portions 30a-30e could be made of a non-metallic material, such as a polymeric material. If made of a non-metallic material, such as a thermally-conductive plastic, one or more of the surfaces, such as surfaces 30a1, 30b2 and 30c1(
While the embodiment shown illustrates the heating element 28 being generally helically-shaped, it should be understood that the heating element 28 does not have to be coiled or helically shaped. For example,
While the heater 20 has been shown with the heating element 28 as the primary heat generating component, it should be understood that other heating elements or components could be used. For example, an elongated one-piece, non-helical conductor or heating rod could be used in place of the helical-shaped heating element 28, thereby eliminating the need for both the heater core or mandrel 26 and heating element 28. For example, the lamp or light source 15 (
Advantageously, the system and method described provide means and apparatus for de-icing and removing condensation. The
This invention, including all embodiments shown and described herein, could be used alone or together and/or in combination with one or more of the features covered by one or more of the claims set forth herein, including but not limited to one or more of the features or steps mentioned in the bullet list in the Summary of the Invention and the claims.
While the system, apparatus, process and method herein described constitute preferred embodiments of this invention, it is to be understood that the invention is not limited to this precise system, apparatus, process and method, and that changes may be made therein without departing from the scope of the invention which is defined in the appended claims.