3m Innovative Properties Company

Mark G Mathews

James F Poch

Kayla A McGrath

James C Medek

Jake D Swensen

Blake R Shamla

Steven T Awiszus

David G Freier

Justin M Johnson

Thomas G Skulley

James W Howard

Karl J L Geisler

Glendon D Kappel

Nicholas G Amell

Elizabeth D Cadogan

Eric J Larson

Scott E Simons

Lingesh Venugopalappa

Embodiment herein provides an Infrastructure article () and method thereof for synchronizing blinks of infrastructure articles in a mesh network. The method includes detecting an expiry of a sync timer counted by a real time clock (RTC) and determining whether a charge level of a battery () of the infrastructure article () meets a battery charge threshold. When the charge level of the battery () of the infrastructure article () meets the battery charge threshold, the method includes establishing a connection with other infrastructure article and/or an infrastructure article server () in the mesh network, and sending a time to synchronize blink of the at least one light source () to all other infrastructure articles in the mesh network. When the charge level of the battery () of the infrastructure article () does not meet the battery charge threshold, the method includes resetting the sync timer, and initiating a count of the sync timer.

Infrastructure article system for synchronizing blinks of infrastructure articles connected in mesh network

Data hub device

A method for a light bulb or fixture to emit light and measure ambient light. The method includes driving solid state light sources, such as LEDs, in the bulb with a cyclical signal to repeatedly turn them off and on, where the light sources are turned off and on at a rate sufficient for the bulb to appear on. The method also includes measuring ambient light via a light sensor in or on the bulb during at least some times when the light sources are off, and outputting a signal related to the measured ambient light. In some cases the light sensor saturates when the solid state light sources are active and measures the ambient light level when the solid state light sources are not active. The ambient light level signal can be used to control when the light bulb is on and an intensity of light output by the bulb.

Apparatus and method for ambient light measurement by a solid state light bulb

The present disclosure describes light delivery and distribution components of a light duct that can be used as a luminaire, such as a bollard-style luminaire that can be useful for the illumination of pedestrian crosswalks, the light engine useful in the luminaire, and methods for making the light engine and the luminaire. The present disclosure further describes methods for crosswalk illumination using the bollard-style luminaires, and methods of communication between bollard luminaires. The bollard luminaire includes a design that generally confines light to illuminate the crosswalk and the pedestrian in the crosswalk, such that light that could produce glare for the pedestrian and/or a driver approaching the crosswalk is minimized.

Luminaire for crosswalk, method for making, and method for controlling

A method for a light bulb or fixture to emit light and measure ambient light. The method includes driving solid state light sources, such as LEDs, in the bulb with a cyclical signal to repeatedly turn the solid state light sources off and on, where the light sources are turned off and on at a rate sufficient for the bulb to appear on. The method also includes measuring ambient light via a light sensor in or on the bulb during at least some times when the light sources are off, and outputting a signal related to the measured ambient light. The ambient light level signal can be used to control when the light bulb is on and an intensity of light output by the bulb.

Growing community of inventors

Oakdale, MN, United States of America

Mark G Mathews