# Patent

## Title
Lamp and proximity switch assembly and method

## Abstract

A lamp and proximity assembly is provided that includes a lens having a transparent window and a light source disposed to illuminate light through the transparent window of the lens. The lamp and proximity assembly further includes a proximity switch having one or more proximity sensors disposed near a perimeter of the transparent window of the lens and generating an activation field proximate to the transparent field of the lens to sense activation of the proximity switch to control activation of the light source.

## Background
FIELD OF THE INVENTION
The present invention generally relates to lamps and switches therefor, and more particularly relates to a lamp assembly having a proximity switch.
BACKGROUND OF THE INVENTION
Automotive vehicles are typically equipped with various user actuatable switches for operating devices including powered windows, headlights, windshield wipers, moonroofs or sunroofs, interior lighting, radio and infotainment devices, and various other devices. Generally, these types of switches need to be actuated by a user in order to activate or deactivate a device or perform some type of control function. Proximity switches, such as capacitive switches, employ one or more proximity sensors to generate a sense activation field and sense changes to the activation field indicative of user actuation of the switch, typically caused by a user's finger in close proximity or contact with the sensor. Capacitive switches are typically configured to detect user actuation of the switch based on comparison of the sense activation field to a threshold.
Automotive lamp assemblies typically include a separate mechanical switch for activating the lighting device. Some lamp assemblies include a depressible lamp assembly that moves to activate a push switch to turn the light on and off. With the availability of proximity switches, a proximity switch may be employed to control activation of the light device. It would be desirable to provide for a proximity switch and lamp assembly which is easy to package and use and does not interfere with the lighting function.
SUMMARY OF THE INVENTION
According to one aspect of the present invention, a lamp and proximity switch assembly is provided. The lamp and proximity switch assembly includes a lens having a transparent window and a light source disposed to illuminate light through the transparent window. The lamp and proximity switch assembly also includes a proximity switch comprising one or more proximity sensors disposed near a perimeter of the transparent window and generating an activation field proximate to the transparent window to sense activation of the proximity switch to control activation of the light source.
According to another aspect of the present invention, a method of controlling a lamp with a proximity switch is provided. The method includes the steps of providing a lens having a transparent window and providing a proximity switch disposed about a perimeter of the transparent window. The method also includes the step of generating an activation field proximate to the transparent window with the proximity switch. The method further includes the step of controlling activation of a light source to illuminate light through the transparent window in response to activation of the proximity switch.
These and other aspects, objects, and features of the present invention will be understood and appreciated by those skilled in the art upon studying the following specification, claims, and appended drawings.



BRIEF DESCRIPTION OF THE DRAWINGS
In the drawings:
FIG. 1 is a perspective view of a passenger compartment of an automotive vehicle having an overhead console employing a pair of lamp and proximity switch assemblies, according to one embodiment;
FIG. 2 is an enlarged view of the overhead console and lamp and proximity switch assemblies shown in FIG. 1;
FIG. 3 is an enlarged view of one lamp and proximity switch assembly having a proximity switch arrangement, according to one embodiment;
FIG. 4 is a cross-sectional view taken through line IV-IV of FIG. 3 illustrating the lamp and switch assembly in relation to a user's finger;
FIG. 5 is a front view of a lamp and switch assembly having an alternate switch arrangement, according to another embodiment;
FIG. 6 is a cross-sectional view taken through line VI-VI of FIG. 5 showing the lamp and switch assembly in relation to a user's finger;
FIG. 7 is a front view of the lamp and switch assembly and proximity switch circuitry of the single proximity switch embodiment shown in FIG. 5;
FIG. 8 is a front view of a lamp and proximity switch assembly and proximity switch circuitry employing two proximity sensors, according to a second embodiment; and
FIG. 9 is a front view of a lamp and proximity switch assembly and proximity switch circuitry employing four proximity sensors, according to a third embodiment.



DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
As required, detailed embodiments of the present invention are disclosed herein; however, it is to be understood that the disclosed embodiments are merely exemplary of the invention that may be embodied in various and alternative forms. The figures are not necessarily to a detailed design; some schematics may be exaggerated or minimized to show function overview. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a representative basis for teaching one skilled in the art to variously employ the present invention.
Referring to FIGS. 1 and 2, the passenger compartment interior of an automotive vehicle 10 is generally illustrated having a pair of lamp and switch assemblies 20 and a plurality of proximity switches 24 assembled in an overhead console 12, according to one embodiment. The vehicle 10 generally includes the overhead console 12 assembled to the headliner on the underside of the roof or ceiling at the top of the vehicle passenger compartment, generally above the front passenger seating area. Each of the pair of lamp and switch assemblies 20 provides an integral assembly of a lamp and a proximity switch for activating a light source to turn the lamp on and off. Each lamp and proximity switch assembly 20 includes a lens having a light transparent window, a light source disposed behind the lens to illuminate light through the transparent window of the lens, and a proximity switch having one or more proximity sensors disposed near a perimeter of the transparent window of the lens and generating an activation field proximate to the transparent field of the lens to sense activation of the proximity switch to control activation of the light source.
A user may activate the light source by activating the proximity switch integrally provided with the lamp and switch assembly 20. The lamp may serve as an interior map or reading lamp to provide interior lighting to the vehicle 10, according to one embodiment. The lamp and switch assembly 20 may also serve as a dome lamp to provide lighting in the interior of the vehicle 10. It should be appreciated that the lamp may serve to provide lighting to the interior of the vehicle for other uses and the lamp and switch assembly 20 may be located elsewhere on the vehicle 10. For example, the lamp and switch assembly 20 may be located in the headliner, a visor, a grab handle, a center console, or elsewhere on the vehicle 10.
The proximity switch provided in each lamp and switch assembly 20 is shown and described herein as a capacitive switch, according to one embodiment. Each proximity switch includes one or more proximity sensors that provide a sense activation field to sense contact or close proximity of an object, such as a user's finger, in close relation to the one or more proximity sensors, such as a tap or swiping motion by a user's finger. Thus, the sense activation field generated by the proximity sensor of each proximity switch is a capacitive field in the exemplary embodiment, and the user's finger has electrical conductivity and dielectric properties that cause a change or disturbance in the sense activation field as should be evident to those skilled in the art. However, it should also be appreciated by those skilled in the art that additional or alternative types of proximity sensors can be used, such as, but not limited to, inductive sensors, optical sensors, temperatures sensors, resistive sensors, the like, or a combination thereof. Exemplary proximity sensors are described in the Apr. 9, 2009, ATMEL® Touch Sensors Design Guide, 10620 D-AT42-04/09, the entire reference hereby being incorporated herein by reference.
A plurality of proximity switches 24 are also shown arranged close to one another in the overhead console 12. The various proximity switches 24 may control any of a number of vehicle devices and functions, such as controlling movement of a sunroof or moonroof 16, controlling movement of a moonroof shade 18, controlling activation of one or more lighting devices, and controlling various other devices and functions. However, it should be appreciated that the proximity switches 24 may be located elsewhere on the vehicle 10, such as in the dash panel, on other consoles such as a center console, integrated into a touch screen display for a radio or infotainment system such as a navigation and/or audio display, or located elsewhere onboard the vehicle 10 according to various vehicle applications.
The proximity switches 24 are shown and described herein as capacitive switches, according to one embodiment. Each proximity switch 24 includes one or more proximity sensors that provide a sense activation field to sense contact or close proximity of a user in close relation on to the one or more proximity sensors, such as a tap or swiping motion by a user's finger. Thus, the sense activation field of each proximity switch 24 is a capacitive field in the exemplary embodiment and the user's finger has electrical conductivity and dielectric properties that cause a change or disturbance in the sense activation field as should be evident to those skilled in the art.
Referring to FIGS. 3 and 4, the lamp and switch assembly 20 is generally illustrated having a lens 32 made of a transparent material integrally molded as part of the overhead console 12. The transparent window 32 of the lens is light transmissive to allow visible light waves to pass through the transparent window 32. A lamp or light source 34 is disposed above the transparent window of the lens 32 to illuminate light through the transparent window 32 of the lens. The light source 34 may include a light emitting diode (LED) mounted to a circuit board 36, according to one embodiment. Other light sources such as an incandescent bulb or combination of one or more light sources may be employed, according to other embodiments. The lens 32 may be integrally formed as part of the overhead console 12 and having the transparent window formed therein, according to one embodiment. In this embodiment, the transparent window 32 may be molded as part of or into a polymeric material forming the overhead console 12. According to other embodiments, the lens 32 may be formed as a separate component and assembled to the overhead console 12. In such embodiments, the lens 32 may be fixedly mounted to the overhead console 12 via fasteners, adhesive or other mounting connection and generally does not move relative to the overhead console 12.
The lamp and proximity switch assembly 20 includes a proximity switch 22 disposed near a perimeter of the transparent window 32 of the lens. The proximity switch 22 has one or more proximity sensors 40 for generating an activation field 44 proximate to the transparent window 32 to sense activation of the proximity switch 22 to control activation of the light source 34. In the embodiment shown, the proximity switch 22 having a single proximity sensor 40 configured to substantially surround the transparent window 32 of the lens. In this embodiment, the proximity switch 22 substantially surrounds the lens 32 to generate an activation field 44 generally across substantially the entire bottom surface of the lens 32 as seen in FIG. 4.
According to one embodiment, the proximity sensor 40 is applied as a conductive ink onto a substrate shown as the upper side of the overhead console 12 about the perimeter of the lens 32. The conductive ink forms electrodes that serve to provide a capacitance which produces the activation field 44. It should be appreciated that other forms of capacitive sensors may be employed to generate the activation field 44. It should be appreciated that the activation field 44 generated by the proximity switch 22 extends below the transparent window 32 of the lens to enable an object, such as a user's finger 70, hand or other body part to enter the activation field 44 to activate the light source 34 on and off. When an object, such as finger 70 sufficiently engages the activation field 44, a disturbance in the activation field 44 is detected such that activation of the switch is initiated so as to either switch the light source 34 on or switch the light source 34 off.
It should be appreciated that the activation field 44 is generally constrained to the area below the transparent window 32 of the lens such that it does not interfere with adjacent proximity switches 24. The proximity switches 24 are shown assembled to the overhead console 12 near the lamp assembly 20. The proximity switches 24 each have a proximity sensor 25 that may be formed as a conductive ink applied onto a substrate such as the upper surface of the polymeric overhead console 12. It should be appreciated that proximity sensor 25 may be otherwise formed as a pre-assembled pad. The proximity switches 24 are disposed at a distance sufficiently away from the lamp and switch assembly 20.
Referring to FIGS. 5 and 6, a lamp and switch assembly 20 is illustrated according to another embodiment in which the proximity switch 22 is disposed within an area of the lens, near a perimeter of a transparent window 32 of the lens that does not interfere with the light transmission path from the light source 34 through the lens. In this embodiment, the proximity switch 22 is provided within the lens, as opposed to surrounding the perimeter of the lens. The light source 34 is disposed above the transparent window 32 of the lens to illuminate light through the transparent window of the lens 32. By mounting the proximity switch 40 on the lens, but outside of the transparent window 32, an integrally formed lens and proximity switch may be provided. The proximity switch 22 has a proximity sensor 40 that generates an activation field 44 in the region below the transparent window of the lens 32 to enable an object, such as a user's finger 70 or other body part, to activate the switch to turn the light source 34 on and off.
Referring to FIG. 7, the single proximity switch and lamp assembly and associated circuitry are illustrated, according to the single sensor arrangement of the first embodiment. First and second conductive lines 56 and 58 provide electrical signals to first and second interdigitated capacitive fingers 52 and 54 which generate the capacitance for the activation field 44. First conductive line 56 may receive a pulsed drive signal while second conductive line 58 outputs a voltage proportional to the capacitance. The interdigitated capacitive fingers 52 and 54 form a capacitive sensor 40 that extends substantially around the perimeter of the transparent window 32 of the lens so as to provide an activation field 44 that substantially covers the transparent window 32 of the lens. The capacitive sensor 40 may be provided as a conductive pad formed using a conductive ink.
Referring to FIG. 8, a lamp and proximity switch assembly 20 is illustrated having two proximity switch sensors 40A and 40B, according to a second embodiment. In this embodiment, the first proximity switch sensor 40A is provided by electrodes 52 and 54 on one side of the transparent window 32 of the lens, while the second capacitive switch sensor 40B is provided by electrodes 52 and 54 on an opposite second side of the transparent window 32 of the lens. Each of the electrodes 52 and 54 is fed electrical signals from conductive lines 56 and 58 to generate capacitance. The first and second capacitive sensors 40A and 40B generate activation fields 44A and 44B, respectively. The capacitive sensors 40A and 40B may be formed as pads onto the lens, bezel or overhead console 12. The activation fields 44A and 44B may be generated in a desired pattern in an area substantially directed towards a center of the transparent window 32 of the lens. Activation of the proximity switch may occur when a user's finger or other object sufficiently enters one or both of the activation fields 44A and 44B. According to one embodiment, the switch assembly 20 may be configured to activate the lamp only when an object sufficiently enters both of the first and second activation fields 44A and 44B, thereby requiring that the object be applied in a region near the center of the transparent window 32 of the lamp.
Referring to FIG. 9, a lamp and proximity switch assembly 20 is illustrated according to a third embodiment employing four proximity switch sensors 40A-40D. The proximity sensors 40A-40D generate four activation fields 44A-44D, respectively in different quadrants of the transparent window 32 of the lens. Each of the activation fields 44A-44D may be generated to extend substantially towards the center of the transparent lens. As a result, the four activation fields 44A-44D substantially cover the transparent window 32 of the lens. By employing four sensor pads, enhanced flexibility is provided to tune the proximity sensors 40A-40D and thus the proximity switch 22 switches to avoid inadvertent actuations. For example, when further capacitive switches, such as switches 24 are located near the lens 32, the burst length of the charge signal applied to the adjacent sensors, such as sensor 40B may be adjusted to shorten the burst length to give a lessened measureable signal, while sensors not in close proximity to other switches may be increased in the signal burst length to give increased measurable signals thereby generating the activation field away from the adjacent switches 24. This has the effect of reducing the inadvertent actuations by lowering sensitivity of one or more sensors on the side closer to the other switches 24 for providing enough sensitivity to provide coverage to the entire lens 32. It should be appreciated that other means of adjusting the intensity or shape of the activation field(s) may be achieved to provide the desired activation signal without interference to adjacent switches 24.
Accordingly, the lamp and proximity switch assembly 20 advantageously provides for an integral proximity switch and lamp arrangement that is easy to use, particularly in an automotive vehicle. The proximity switch may easily be activated by contact or close proximity of an object, such as user's finger in relation to the proximity switch to turn a lamp on and off. The arrangement of the proximity switch around the perimeter of the transparent window of the lens allows for a transparent window to be free of switch assembly material in a cost-effective manner.
It is to be understood that variations and modifications can be made on the aforementioned structure without departing from the concepts of the present invention, and further it is to be understood that such concepts are intended to be covered by the following claims unless these claims by their language expressly state otherwise.

## Claims

1. A lamp and proximity switch assembly comprising:
a lens having a transparent window;
a light source disposed to illuminate light through the transparent window of the lens; and
a proximity switch comprising one or more proximity sensors substantially surrounding or disposed on a perimeter of the transparent window and generating an activation field proximate to the transparent window to sense activation of the proximity switch to control activation of the light source.

2. The assembly of claim 1, wherein the one or more proximity sensors are disposed substantially surrounding the perimeter of the transparent window.

3. The assembly of claim 1, wherein the one or more proximity sensors comprises first and second proximity sensors generating first and second activation fields, wherein the first and second activation fields overlap.

4. The assembly of claim 3, wherein control of the light source occurs when both the first and second activation fields are activated.

5. The assembly of claim 1, wherein the assembly is employed on a vehicle.

6. The assembly of claim 1, wherein the one or more proximity sensors comprise one or more capacitive sensors.

7. The assembly of claim 1, wherein the light source comprises an LED.

8. The assembly of claim 1, wherein the one or more proximity sensors comprises a plurality of proximity sensors disposed substantially around the perimeter of the lens.

9. The assembly of claim 8, wherein each of the plurality of proximity sensors are individually controlled so as to control the activation field output of each of the proximity sensors.

10. A method of controlling a lamp with a proximity switch assembly, said method comprising:
providing a lens having a transparent window;
providing a proximity switch substantially surrounding or disposed on a perimeter of the transparent window;
generating an activation field proximate to the transparent window with the proximity switch; and
controlling activation of a light source to illuminate light through the transparent window of the lens in response to activation of the proximity switch.

11. The method of claim 10, wherein the step of providing the proximity switch comprises providing one or more proximity sensors substantially surrounding the perimeter of the transparent window.

12. The method of claim 10, wherein the step of providing a proximity switch comprises providing first and second proximity sensors generating first and second activation fields, wherein the first and second activation fields overlap.

13. The method of claim 12, wherein the control of the light source occurs when both the first and second activation fields are activated.

14. The method of claim 10, wherein the step of providing a proximity switch comprises providing a plurality of proximity sensors disposed substantially around the perimeter of the lens.

15. The method of claim 14 further comprising the step of individually controlling the activation field output of each of the proximity sensors.

16. The method of claim 10, wherein the assembly is employed on a vehicle.

17. The method of claim 10, wherein the proximity switch comprises a capacitive switch.

18. The method of claim 10, wherein the light source comprises an LED.

19. The method of claim 10, wherein the step of providing a proximity switch comprises applying a conductive ink onto a substrate to form a proximity sensor.