Patent Application
20200368793
This invention relates to lenses of a vehicle that are exposed to the environmental elements and, more particularly, to an ultrasonic lens cleaner structure for cleaning such lenses.
Vehicles typically include cameras, LIDAR sensors, and lighting, each having has a lens or transparent window cover disposed on the exterior of the vehicle and thus exposed environmental elements such as dirt, dust, water, ice, mud and other elements. Since the lens or window cover need to be clean for optimal operation, there is a need to provide an ultrasonic lens cleaner structure to clean the lens or window cover.
An object of the invention is to fulfill the need referred to above. In accordance with the principles of the present invention, this objective is achieved by an ultrasonic lens cleaner structure including a lens of a device of a vehicle. The lens having an external surface disposed externally of the vehicle and exposed to environmental elements. An ultrasonic transducer is associated with the lens and is tuned to a resonance frequency of the lens. A frequency source is constructed and arranged to drive the ultrasonic transducer. When the frequency generator drives the ultrasonic transducer at the tuned resonance frequency of the lens, the lens will vibrate at the tuned resonance frequency so as to remove or prevent the environmental elements from collecting on the external surface of the lens.
In accordance with another aspect of an embodiment, a method of cleaning a lens of a device of a vehicle provides the lens to have an external surface disposed externally of the vehicle and exposed to environmental elements. An ultrasonic transducer is associated with the lens. The method tunes the ultrasonic transducer to a resonance frequency of the lens. The ultrasonic transducer is driven at the tuned resonance frequency of the lens, thereby causing the lens to vibrate at the tuned resonance frequency to remove or prevent the environmental elements from collecting on the external surface of the lens.
Other objects, features and characteristics of the present invention, as well as the methods of operation and the functions of the related elements of the structure, the combination of parts and economics of manufacture will become more apparent upon consideration of the following detailed description and appended claims with reference to the accompanying drawings, all of which form a part of this specification.
The invention will be better understood from the following detailed description of the preferred embodiments thereof, taken in conjunction with the accompanying drawings, wherein like reference numerals refer to like parts, in which:
With reference to
As used herein, “lens” 16 can include any transparent window of the device 18, 18′ that needs to be clean for optimal functioning of the device. The lens 16 can be of glass, plastic, plexiglass or other materials that are conventional for a lens or transparent window.
The lens 16 has a known resonance frequency and can also have multiple known resonance frequencies depending on the material used and the shape/geometry of the lens 16. A resonance frequency is the frequency at which the lens will naturally resonate and thus will absorb the most energy from the frequency source 14. Thus, in accordance with the embodiment, to clean the lens 16, the frequency source or generator 14 drives the transducer 12 that is tuned to a resonance frequency of the lens 16. The energy created via the transducer 12 and generator 14 causes the exterior surface 22 of the lens 16 to vibrate at a resonance frequency thereof which causes environmental elements 20 to be removed or prevented from collecting on the exterior surface 22.
With reference
The transducer 12 can be powered only when the vehicle 17 is operated or can be continuously operated if the current consumption of the transducer 12 is acceptable to the vehicle's battery lifetime.
Fundamental frequency and associated harmonics of the ultrasound wave from the transducer 12 can be considered in the design of the electronics for the device 18, 18′ employing the lens 16. When the device is a rear facing camera 18 or LIDAR sensor 19′, with reference to
The foregoing preferred embodiments have been shown and described for the purposes of illustrating the structural and functional principles of the present invention, as well as illustrating the methods of employing the preferred embodiments and are subject to change without departing from such principles. Therefore, this invention includes all modifications encompassed within the scope of the following claims.
