Tesla Cybertruck, courtesy of Tesla Inc.
Nicolas Caballero's picture

Tesla Published Laser Windshield Wipers Patent: Goodbye To Obsolete Technology

The United States Patent Office has officially published the patent for Tesla's laser windshield wipers, a system that automatically detects and removes both water and dirt from windshield glass.
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Tesla manufactures its electric cars from scratch, basically without the constraints that most traditional manufacturers inherit from combustion cars. Taking advantage of this premise, Tesla is developing a whole technological framework in order to make its cars easier and cheaper to manufacture, and more useful to customers. Among the systems that Tesla is determined to change at the root are the windshield wipers, for which it has already invented a system for detecting water and traces of dirt, that are later destroyed by a laser beam.

Model S, courtesy of Tesla Inc.

The traditional design of windscreen wipers, made up of one or several arms, disturbs the driver's vision and, in most cases does not manage to remove water efficiently; apart from being practically harmless against dirt. Back in 2019 Tesla presented an electromagnetic system that tried to deal with part of these drawbacks through electromagnetic windshield wipers. Apparently developed for the Roadster, a single wand works in a linear fashion in order to remove water falling on its windshield. The Tesla Cybertruck has also attracted attention because the prototypes shown up to now do not exhibit any type of visible windshield wipers on its front, although this may be due to the fact that it is still reviewing the final design.

Tesla Cybertruck, courtesy of Tesla Inc.

In May 2019 another system that used lasers to remove water and dirt was also filed with the United States Patent Office. Now Tesla's idea and all its details have been officially published, after having granted the patent at the end of 2021. Under the name "Pulsed laser cleaning of debris (debris) accumulated on glass items in vehicles and photovoltaic assemblies" is one of the coolest - and craziest - ideas from Tesla so far.

In the text that describes the patent, Tesla states that it is a cleaning system for the windows (and solar panels, eventually) of a vehicle, that includes three components: an optical assembly that emits a laser beam to irradiate a region on the glass, a circuit that detects the debris accumulated on that region and a control circuit. The control circuit calibrates the parameters associated with the laser beam emitted from the optics based on the elements detected in the region. It also controls the level of exposure of the laser beam on them based on the calibration.
Although it is not confirmed that Tesla intends to implement this system soon, the patent images show it installed on a Tesla Model S, which could mean that the first test prototypes that have already been developed or will be developed can be implemented on this particular model.

Tesla Model S, courtesy of Tesla Inc.

The flowchart the patent draws - which explains the logic with which the system would work - is as follows: first, the debris detection system acts by constantly sweeping the surface of the windshield. Next, once the region to act on and the type of material on which it is going to work have been analyzed, the parameters of the laser beam are calibrated (to be emitted from the optical system); then the system calculates the level of exposure of the laser beam on the materials. It then irradiates the windshield, eliminating debris in that predetermined area.

The system should work automatically, although Tesla describes a potential manual system controlled by the driver that could direct the laser beam to the desired area by controlling it through a touch screen, a joystick, “or another means that would allow the driver to communicate with the driver", a system that should be simple and effective.

You can review the patent in full on this link.

All images courtesy of Tesla Inc.

Nico Caballero is the VP of Finance of Cogency Power, specializing in solar energy. He also holds a Diploma in Electric Cars from Delft University of Technology in the Netherlands, and enjoys doing research about Tesla and EV batteries. He can be reached at @NicoTorqueNews on Twitter. Nico covers Tesla and electric vehicle latest happenings at Torque News.


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Comments

Will be interesting to see how much energy is required to irradiate water and debris in order to vaporize it and how much reflected energy ends up going into the atmosphere (without some special glass being used for windshields that doesn't reflect light). Given the need for non-visible laser light to be used, to not interfere with driving, the amount of laser energy hitting the eyes of unaware pilots will also be unknown until airplanes get laser detectors or "mysterious" retina burns start showing up in hospitals.