Patent Description:
Vehicles such as commercial aircraft are used to transport passengers between various locations. Systems are currently being developed to disinfect or otherwise sanitize surfaces within aircraft, for example, that use ultraviolet (UV) light.

In order to sanitize a surface of a structure, a known UV light sterilization method emits a broad spectrum UVC light onto the structure. However, UVC light typically takes a significant amount of time (for example, three minutes) to kill various microbes. Further, various microbes may not be vulnerable to UVC light. That is, such microbes may be able to withstand exposure to UVC light.

Also, certain types of microbes may develop a resistance to UVC light. For example, while UVC light may initially kill certain types of microbes, with continued exposure to UVC light over time, the particular species of microbe may develop a resistance to UVC light and able to withstand UVC light exposure.

Additionally, direct exposure of certain types of UV light may pose risk to humans. For example, certain known UV systems emit UV light having a wavelength of <NUM>, which may pose a risk to humans. As such, certain known UV light disinfection systems and methods are operated in the absence of individuals. For example, a UV light disinfection system within a lavatory may be operated when no individual is within the lavatory, and deactivated when an individual is present within the lavatory. Also, UV radiation may degrade certain materials over time, which may require costly replacements for certain textiles, soft goods, and interior materials, particularly plastics.

<CIT>, in accordance with its abstract, states a system and method of disinfecting an area using germicidal radiation. The system is configured to track person within the environment, and to control one or more germicidal radiation emitters based on user and sensor inputs, such as detecting whether the eyes are protected for the persons in this environment. The system is configured to intentionally and safely expose persons in the environment to germicidal radiation.

<CIT>, in accordance with its abstract, states a lighting device configured to deactivate dangerous microorganisms in an environment. The lighting device includes at least one lighting element with a single light source configured to provide disinfecting light. At least a first component of the light has a wavelength of about <NUM>, and at least a second component of the light has a wavelength of greater than <NUM>. The first component of light has a minimum integrated irradiance of <NUM> mW/cm<NUM> measured from any unshielded point in the environment that is <NUM> from any point on any external-most luminous surface of the lighting device.

<CIT> discloses a disinfection system for an aircraft window assembly that includes a light assembly with a LED light source. This LED light source projects wavelengths ranging from about <NUM> to about <NUM> nanometers, more specifically from about <NUM> to about <NUM> nanometers, or from about <NUM> to about <NUM> nanometers. The disinfection system also includes a controller that communicates with the light assembly.

<CIT> discloses an integrated LED structure that emits disinfecting visible light. This LED structure is connected to an electrical control interface and has applications in airplanes.

<CIT>, in accordance with its abstract, states a fluid removal system that includes an operative sub-system, such as an ultraviolet (UV) light sanitizing system, that is configured to operate according to an operative cycle, such as a sanitizing cycle, and is configured to output an activation signal during the operative cycle. An actuator is operatively coupled to the operative sub-system and moveably connected to a fluid removal conduit. The fluid removal conduit is closed when the actuator is in a closed position, and opened when the actuator is in an open position. The actuator moves into the open position in response to the operative sub-system outputting the activation signal. Fluid, such as ozone, within a confined space is drawn into the fluid removal conduit when the actuator is in the open position and exhausted through an exhaust port.

<CIT>, in accordance with its abstract, states a lighting assembly that is configured to selectively emit light at a first frequency and light at a second frequency. The lighting assembly includes a light source that is configured to emit the light at the first frequency over a light emission path, a light converter, and an actuator operatively coupled to the light source or the light converter. The actuator is configured to move the light converter or the light source relative to the other of the light converter or the light source between a first position and a second position. The light converter is within the light emission path in the first position, and outside of the light emission path in the second position. The light converter converts the light at the first frequency to the light at the second frequency in the first position, and wherein the light at the first frequency is emitted from the lighting assembly when the light converter is in the second position.

A need exists for a system and a method for disinfecting surfaces of structures and components that can be safely operated in the presence of humans, and which does not degrade materials. Further, a need exists for a system and a method for efficiently and effectively neutralizing various microorganisms, such as bacteria and germs.

With those needs in mind, certain embodiments of the claimed subject matter provide a sanitizing system according to claim <NUM>. In at least one embodiment, the disinfecting visible light may have a wavelength between <NUM> - <NUM>. For example, the disinfecting visible light may have a wavelength of <NUM>. In at least one embodiment, the lighting assembly may be configured to continuously emit the disinfecting visible light. In at least one embodiment, the area may be an enclosed space, such as within a vehicle, including aircraft.

For example, the lighting control unit may be configured to operate the lighting assembly in a first mode and a second mode. The disinfecting visible light is emitted at a first intensity in the first mode. The disinfecting visible light is emitted at a second intensity that differs from the first intensity in the second mode. As a further example, the lighting control unit may be configured to operate the lighting assembly in a third mode. The disinfecting visible light is emitted at a third intensity in the third mode. The third intensity differs from the first intensity and the second intensity.

In at least one embodiment, one or more presence sensors may be in communication with the lighting control unit. The one or more presence sensors may be configured to detect a presence of an individual within the area and output presence signals to the lighting control unit. The lighting control unit may selectively switch the lighting assembly between different modes based on the presence signals received from the presence sensors.

In at least one embodiment, a sensor may be configured to determine when a toilet is flushed. The sensor may be in communication with the lighting control unit. The lighting control unit may selectively switch the lighting assembly between different modes in response to the toilet being flushed.

In at least one embodiment, a door may have a lock. The lighting control unit may be in communication with the lock (for example, a switch of the lock). The lighting control unit may selectively switch the lighting assembly between different modes in response to the door being locked or unlocked.

As an example, the lighting assembly may include a first set of visible light emitting elements. The first set of visible light emitting elements is configured to emit white light (which includes an embedded disinfectant spectral content). The lighting assembly may also include a second set of visible light emitting elements. The second set of visible light emitting elements is configured to emit the disinfecting visible light (which may include little spectral content outside of the disinfecting spectra).

Certain embodiments of the claimed subject matter provide a sanitizing method according to claim <NUM>. In at least one embodiment, said emitting may include continuously emitting the disinfecting visible light.

In at least one embodiment, the sanitizing method may further comprise operating, by the lighting control unit, the lighting assembly. For example, said operating may include operating the lighting assembly in a first mode and a second mode, wherein the disinfecting visible light is emitted at a first intensity in the first mode, and wherein the disinfecting visible light is emitted at a second intensity that differs from the first intensity in the second mode. As a further example, said operating may also include operating the lighting assembly in a third mode, wherein the disinfecting visible light is emitted at a third intensity in the third mode, and wherein the third intensity differs from the first intensity and the second intensity.

In at least one embodiment, the sanitizing method may include communicatively coupling one or more presence sensors with the lighting control unit, detecting, by the one or more presence sensors, a presence of an individual within the area, outputting, by the one or more presence sensors, presence signals to the lighting control unit, and selectively switching, by the lighting control unit, the lighting assembly between different modes based on the presence signals received from the presence sensors.

In at least one example, the sanitizing method may include selectively switching, by the lighting control unit, the lighting assembly between different modes in response to a toilet being flushed.

In at least one embodiment, the sanitizing method may include selectively switching, by the lighting control unit, the lighting assembly between different modes in response to a door being locked or unlocked.

The foregoing summary, as well as the following detailed description of certain embodiments will be better understood when read in conjunction with the appended drawings. The scope is defined by the appended claims. Further, references to "one embodiment" are not intended to be interpreted as excluding the existence of additional embodiments that also incorporate the recited features. Moreover, unless explicitly stated to the contrary, embodiments "comprising" or "having" an element or a plurality of elements having a particular condition can include additional elements not having that condition.

Certain embodiments provide a sanitizing system that includes a light assembly that emits disinfecting visible light, which effectively deactivates microorganisms, such as bacteria, germs, and viruses, while being safe for human exposure. The disinfecting visible light has a wavelength that is within the light spectrum that is visible to humans. In at least one embodiment, the disinfecting visible light has a wavelength between <NUM> - <NUM>. For example, it has been found that disinfecting visible light having a wavelength of <NUM> effectively deactivates various microorganisms, such as certain bacteria, germs, and viruses. As described herein, embodiments provide systems and methods that emit visible light to sanitize surfaces of structures and components.

Embodiments provide visible light disinfection systems and methods that allow for continuous (that is, without interruption) emission of disinfecting visible light , such as within an internal cabin of an aircraft. In at least one embodiment, the systems and methods do not emit ultraviolet light, and are therefore safer for use in the presence of humans. Visible light disinfection, in conjunction with occupancy sensors, may operate based on different modes such that when an enclosed space is unoccupied, the light assembly can boost the disinfecting visible light to a higher dose. The disinfecting visible light can be continuously emitted from the light assembly, thereby preventing, minimizing, or otherwise reducing an overall presence of various microorganisms, such as certain bacteria, germs, and viruses.

In at least one embodiment, the lighting assembly can be selectively operated based on phases of a trip (such as a flight). For example, the lighting assembly can continuously emit the disinfecting visible light while selectively switching among different lighting schemes within an enclosed space, such as a galley, a lavatory, a cargo hold, a flight deck, a crew rest space, and/or the like. The lighting assemblies may be disposed through an internal cabin of an aircraft, for example. With the addition of visible light disinfection light emitters (such as light emitting diodes, bulbs, lamps, or the like), the lighting assembly can be selectively switched between various lighting modes, each of which may continuously emit the disinfecting visible light.

In at least one embodiment, the disinfecting visible light can be emitted in a low intensity mode when individuals are present, and a high intensity mode when individuals are not present. For example, the high intensity mode is safe for use in the presence of individuals, but the resulting light may not be aesthetically pleasing and/or amenable to reading, for example. A lighting control unit can automatically control the lighting assembly based on predetermined criteria. Additionally or optionally, the lighting assembly can be manually controlled. For example, the lighting control unit can be in communication with one or more presence sensors that are configured to detect presence of an individual within an enclosed space. The lighting control unit can selectively switch the lighting assembly between different modes based on whether or not an individual is within the enclosed space.

In at least one embodiment, the lighting assembly may be used within a lavatory. The lighting control unit is in communication with the lighting assembly, a sensor for detecting a toilet flush, and a sensor for detecting if a door has been opened. The lighting control unit monitors the sensors and based on sensing the flush and/or the door opening (such as indicating an individual is no longer within the lavatory), increasing an intensity of the disinfecting visible light to efficiently disinfect surfaces within the lavatory. In contrast, when the sensors indicate that an individual is within the lavatory, the lighting control unit decreases the intensity of the disinfecting light and may increase intensity of warm or cool white light, which provides a more aesthetically desirable illumination within the lavatory.

As described herein, embodiments provide systems and methods for disinfecting surfaces within an enclosed space, such as within an internal cabin of an aircraft. The lighting assembly may continuously emit the disinfecting visible light, instead of periodic emission of disinfecting light (as is the case with ultraviolet systems and methods). As such, embodiments provide systems and methods that continuously and automatically sanitize surfaces within an enclosed space.

As described herein, a sanitizing system is configured to disinfect at least one surface within an enclosed space. The sanitizing system includes a lighting assembly is configured to emit disinfecting visible light (in contrast to UV light) onto the at least one surface. The disinfecting visible light is configured to neutralize (for example, render inactive, kill, minimize, or otherwise reduce) microorganisms on the at least one surface.

<FIG> illustrates a schematic diagram of visible light sanitizing system <NUM> for an area, such as an enclosed space <NUM>, according to an embodiment. The visible light sanitizing system <NUM> may be used in various areas, whether enclosed, partially enclosed, or open. In at least one embodiment, the enclosed space may not be in direct sunlight.

The enclosed space <NUM> may be defined by a floor <NUM>, a ceiling <NUM>, and walls <NUM> extending between the floor <NUM> and the ceiling <NUM>. A door <NUM> may be moveably secured to one of the walls <NUM>. The door <NUM> includes a lock <NUM> that is configured to securely lock the door <NUM> in a closed position. When the lock <NUM> is in a locked position, the door <NUM> is unable to be opened. When the lock <NUM> is in an unlocked position, the door <NUM> may be opened. The enclosed space <NUM> may be a confined space onboard a commercial aircraft. For example, the enclosed space <NUM> may be a lavatory onboard an aircraft. As another example, the enclosed space <NUM> may be a galley onboard an aircraft. As yet another example, the enclosed space <NUM> may be a passenger cabin onboard an aircraft. The enclosed space <NUM> may or may not include the door <NUM>. The enclosed space <NUM>, according to embodiments not forming part of the claimed subject matter, may be within various other vehicles, structures, and/or the like. For example, the enclosed space <NUM> may be a room within a commercial, municipal, or residential building, or a room onboard a train, bus, ship, or the like.

The enclosed space <NUM> includes at least one structure <NUM> to be sanitized (for example, disinfected, sterilized, or otherwise cleaned) after use. For example, the structure <NUM> may be one or more of a toilet, sink, floor, countertop, cabinet, and/or the like within a lavatory of an aircraft.

The visible light sanitizing system <NUM> includes a lighting assembly <NUM> that includes a housing <NUM> and visible light emitter <NUM>. The lighting assembly <NUM> is mounted to a portion of the enclosed space <NUM>, such as through the housing <NUM>. For example, the lighting assembly <NUM> can be mounted the ceiling <NUM>. As another example, the lighting assembly <NUM> can be mounted to a wall <NUM> or the floor <NUM>. In at least one embodiment, multiple lighting assemblies <NUM> are disposed within the enclosed space <NUM>.

In at least one embodiment, the visible light emitter <NUM> includes one or more visible light elements <NUM>, such as a lamp(s), light emitting diode(s) (LEDs), microfilament(s), fiber optic element(s), bulb(s), and/or the like. The visible light emitter <NUM> is configured to emit visible light <NUM>, which includes disinfecting visible light <NUM>.

In at least one embodiment, the disinfecting visible light <NUM> has a wavelength of between <NUM> - <NUM>. As a more particular example, the disinfecting visible light <NUM> has a wavelength of between <NUM> - <NUM>. In at least one embodiment, the disinfecting visible light <NUM> has a wavelength of <NUM>. It has been found that the disinfecting visible light <NUM> having a wavelength of <NUM> effectively neutralizes various microorganisms, such as certain bacteria, germs, and viruses. For example, visible light having a wavelength of <NUM> excites porphyrin in cells of certain microorganisms. With continued exposure to the visible light at a wavelength of <NUM>, the porphyrin becomes overly excited and damaged, thereby rendering the cells inactive due to an oxygen dependent reaction within the cells. Notably, the cell membranes experience oxygenated damage, and therefore the cells are unable to function. The lighting assembly <NUM> continuously emits the disinfecting visible light <NUM>, thereby ensuring that microorganisms on surfaces within the enclosed space that are exposed to the disinfecting visible light <NUM> are rendered inactive. As such, the lighting assembly <NUM> effectively and efficiently sanitizes surfaces within the enclosed space <NUM>.

<FIG> illustrates a light spectrum <NUM>. The light spectrum <NUM> includes ultraviolet light <NUM>, visible light <NUM>, and infrared light <NUM>. The visible light <NUM> includes the disinfecting visible light <NUM>, such as indigo light at <NUM>, in contrast to typical UVC germicidal light <NUM>, such as having a wavelength of <NUM> or <NUM>. The disinfecting visible light <NUM>, such as indigo light at <NUM>, is safe in relation to humans. That is, humans can safely be exposed to indigo light at <NUM>. As such, the disinfecting visible light <NUM> can continuously be emitted by the lighting assembly <NUM> (shown in <FIG>) even when individuals are in the enclosed space <NUM>. In contrast, UV sanitizing systems typically emit UVC germicidal light <NUM> intermittently, such as when there are no individuals within the enclosed space <NUM>. However, in contrast to the continuous emission of the disinfecting visible light <NUM>, intermittent UVC germicidal light <NUM> allows microorganisms to activate and/or multiply when the UVC germicidal light <NUM> is not emitted.

Referring again to <FIG>, a lighting control unit <NUM> is in communication with the lighting assembly <NUM>, such as through one or more wired or wireless connections. The lighting control unit <NUM> may be positioned within or connected to the enclosed space <NUM>, or may be remotely located therefrom. In at least one embodiment, the lighting control unit <NUM> is housed within the lighting assembly <NUM>. The lighting control unit <NUM> is configured to control operation of the lighting assembly <NUM>, such as to selectively switch between different lighting modes, all of which may emit the disinfecting visible light <NUM>. In at least one embodiment, the lighting control unit <NUM> can utilize a firmware profile that includes various kinds profiles loaded thereon, such as via a wireless upload.

In at least one embodiment, the lighting control unit <NUM> is configured to operate the lighting assembly <NUM> in a first mode and a second mode. The disinfecting visible light <NUM> is emitted at a first intensity in the first mode, and the disinfecting visible light <NUM> is emitted at a second intensity that differs from the first intensity in the second mode. For example, the second intensity may be greater than the first intensity. In at least one embodiment, the second intensity is at least four times the first intensity. Further, the lighting control unit <NUM> may be further configured to operate the lighting assembly <NUM> in a third mode. The disinfecting visible light <NUM> is emitted at a third intensity in the third mode. The third intensity differs from the first intensity and the second intensity. For example, the third intensity may be greater than the first intensity, but less than the second intensity.

A user interface <NUM>, such as a computer station, a portable computer, a handheld device (for example, a smart phone or smart tablet), and/or the like, may be in communication with the lighting control unit <NUM>, such as through one or more wired or wireless connections. The user interface <NUM> allows an individual to selectively control the lighting assembly <NUM>. For example, the user interface <NUM> allows the individual to manually turn the lighting assembly <NUM> on and off, select between different modes, and/or the like. Optionally, the visible light sanitizing system <NUM> may not include the user interface <NUM>.

In at least one embodiment, operational architecture for the visible light sanitizing system <NUM> may be coordinated, synchronized, or the like with that of a vehicle, such as an aircraft. According to the invention, when an aircraft reaches a cruising altitude, a signal is sent, such as sent from a control unit, from a wheel-up command to the lighting control unit <NUM> to automatically operate the lighting assembly <NUM> at a first setting.

According to the invention, during descent, a signal is sent to the lighting control unit <NUM> to automatically operate the lighting assembly <NUM> at a second setting, such as at an intensified disinfecting mode (for example, a lavatory is unoccupied during a descent), and may revert back to the first setting when the aircraft parks at a gate.

One or more presence sensors <NUM> may be secured within the enclosed space <NUM>. The presence sensors <NUM> may be ultrasound sensors, infrared sensors, thermal sensors, and/or the like that are configured to detect the presence of an individual within the enclosed space. In at least one embodiment, at least one presence sensor <NUM> (such as coupled to the floor <NUM>) may be a digital scale that detects the presence of an individual through a discernable detection of mass or weight within the enclosed space <NUM>. The presence sensors <NUM> are in communication with the lighting control unit <NUM> through one or more wired or wireless connections. Based on presence signals received from the presence sensors <NUM>, the lighting control unit <NUM> determines whether or not an individual is within the enclosed space <NUM>. In at least one embodiment, the lighting control unit <NUM> operates the lighting assembly <NUM> to emit the visible light <NUM> in different modes based on whether or not an individual is within the enclosed space <NUM>.

For example, based on the presence signals as received from the presence sensors <NUM>, when the lighting control unit <NUM> determines that an individual is within the enclosed space <NUM>, the lighting control unit <NUM> operates the lighting assembly <NUM> in a first mode (such as a standard illumination mode), in which the visible light emitter <NUM> emits the visible light <NUM> as white light, which includes the disinfecting visible light <NUM> (such as having a wavelength of <NUM>). By emitting the white light that includes the disinfecting visible light <NUM>, familiar white light illuminates the enclosed space <NUM>, and the disinfecting visible light <NUM> may not be discernable to an individual within the enclosed space <NUM>. In this manner, the disinfecting visible light <NUM> is continuously emitted to disinfect surfaces within the enclosed space <NUM>, and familiar, aesthetically desirable white light illuminates the enclosed space <NUM>.

When the presence sensors <NUM> emit presence signals that indicate that no individual is present within the enclosed space <NUM>, the lighting control unit <NUM> can operate the lighting assembly <NUM> in a second mode that differs from the first mode. For example, the second mode can be a deep clean mode, in which the disinfecting visible light <NUM> is emitted at an increased intensity or power. For example, in the deep clean mode, lighting assembly <NUM> can emit the disinfecting visible light <NUM> having a wavelength of <NUM> at four times an intensity as compared to the first mode. In the second mode, the lighting assembly <NUM> may or may not emit white light. As such, power to the lighting assembly <NUM> can be diverted to one or more portions of the visible light emitter <NUM> that emit the disinfecting visible light <NUM>, and away from one or more portions that emit visible light at other wavelengths. In this manner, power consumed by the lighting assembly <NUM> may be redistributed, instead of increased.

While the disinfecting visible light <NUM> in the second mode is emitted at an increased intensity, the disinfecting visible light <NUM> is safe for human exposure. However, the disinfecting visible light <NUM> may be viewed by individuals as aesthetically undesirable, and may therefore not be emitted when an individual is within the enclosed space <NUM>.

The lighting assembly <NUM> can also be operated by the lighting control unit <NUM> in a third mode, such as a white plus increased disinfecting mode. Such may be used when an individual is within the enclosed space <NUM>. Such mode includes white light (which includes at least a portion of the disinfecting visible light <NUM>) and increased disinfecting visible light <NUM>, such as at an increased intensity. For example, certain light emitting elements may be dedicated disinfecting visible light emitters. In this manner, white light can be emitted, along with disinfecting visible light <NUM> at an increased intensity. The additional disinfecting visible light <NUM> may darken the overall illumination, which may be used such to provide reading illumination and increased disinfection. For example, the third mode may be used within an internal cabin during night time, when certain passengers are asleep.

As used herein, the terms first, second, third, and the like are merely for labeling purposes. For example, the first mode may optionally be the second or third mode, the second mode may optionally be the first or third mode, and the third mode may optionally be the first or second mode.

The user interface <NUM> may be used to selectively switch the lighting assembly <NUM> between the different modes. As another example, the lighting control unit <NUM> automatically switches the lighting assembly between the different modes, such as based on the presence of one or more individuals within the enclosed space <NUM> (such as an internal cabin of an aircraft), a time of day, a phase of travel (such as takeoff, cruising, and landing of a commercial aircraft), and/or the like.

As another example, the structure <NUM> can include a sensor <NUM>. For example, the structure <NUM> may be a toilet, and the sensor <NUM> is configured to determine when the toilet is flushed. For example, the sensor <NUM> can be an audio sensor, a fluid flow sensor, a pressure sensor, and/or the like. The lighting control unit <NUM> is in communication with the flush sensor, and may selectively switch between modes based on when the toilet is flushed. For example, the lighting control unit <NUM> can switch the lighting assembly <NUM> to a deep clean mode a predetermined period, such as one minute, after the toilet has been flushed and/or presence sensors <NUM> detect an individual is no longer within the enclosed space <NUM>.

As another example, the lighting control unit <NUM> may be configured to determine that the enclosed space is unoccupied, such as by being in communication with the lock <NUM>. For example, the lighting control unit <NUM> may determine that the enclosed space <NUM> is unoccupied when the door <NUM> is locked. When the door <NUM> is locked, the lighting control unit <NUM> may operate the lighting assembly <NUM> only in a standard illumination mode, for example, such as described herein. As another example, the lighting control unit <NUM> may switch to a second mode (for example, the deep clean mode) based on a sequence of events, which may be triggered by the structure <NUM> being used, the door <NUM> being unlocked, and the door <NUM> being subsequently closed.

<FIG> illustrates a schematic diagram of visible light sanitizing system for an area. In this embodiment, the lighting assembly <NUM> including the visible light emitter <NUM> may be supported on a stand <NUM>, for example. The stand <NUM> may include one or more moveable portions. For example, the lighting assembly <NUM> may be a lamp that is configured to be supported on a surface, such as a desk, cabinet, floor, or the like. As another example, the lighting assembly <NUM> may be part of a handheld system. For example, the lighting assembly <NUM> may be included in a wand.

<FIG> illustrates a flow chart of a visible light sanitizing method for an enclosed space. Referring to <FIG>, and <FIG>, at <NUM>, the lighting control unit <NUM> operates the lighting assembly <NUM> in a first mode, in which white light including the disinfecting visible light <NUM> is emitted. At <NUM>, the lighting control unit <NUM> determines if one or more individuals are present within the enclosed space, such as through one or more presence sensors <NUM> and/or the lock <NUM>, as described herein. If an individual is present, the method returns to <NUM>. If, however, an individual is not present, the method proceeds from <NUM> to <NUM>, at which the lighting control unit <NUM> operates the lighting assembly <NUM> in a second mode, in which the disinfecting visible light <NUM> at an increased intensity (such as four times the intensity as in the first mode) is emitted. In the second mode, the white light may or may not also be emitted. The method then returns to <NUM>. The visible light sanitizing method may also include a third mode, in which white light (which includes at least a portion of a disinfecting visible light) is emitted, along with additional emitted disinfecting visible light.

In at least one other embodiment, instead of (or optionally in addition to) detecting whether or not an individual is present at <NUM>, the method may include operate based on a timer, program, or response to various types of sensors, microphones, or the like. For example, after a predetermined period of time, the lighting assembly may switch modes. As another example, the lighting assembly may switch between modes based on an audio command, such as voice through a microphone.

As used herein, the term "control unit," "central processing unit," "CPU," "computer," or the like may include any processor-based or microprocessor-based system including systems using microcontrollers, reduced instruction set computers (RISC), application specific integrated circuits (ASICs), logic circuits, and any other circuit or processor including hardware, software, or a combination thereof capable of executing the functions described herein. Such are exemplary only, and are thus not intended to limit in any way the definition and/or meaning of such terms. For example, the lighting control unit <NUM> may be or include one or more processors that are configured to control operation of the lighting assembly <NUM>, as described above.

The lighting control unit <NUM> is configured to execute a set of instructions that are stored in one or more data storage units or elements (such as one or more memories), in order to process data. For example, the lighting control unit <NUM> may include or be coupled to one or more memories. The data storage units may also store data or other information as desired or needed. The data storage units may be in the form of an information source or a physical memory element within a processing machine.

The set of instructions may include various commands that instruct the lighting control unit <NUM> as a processing machine to perform specific operations such as the methods and processes of the various embodiments of the subject matter described herein. The set of instructions may be in the form of a software program. The software may be in various forms such as system software or application software. Further, the software may be in the form of a collection of separate programs, a program subset within a larger program, or a portion of a program. The software may also include modular programming in the form of object-oriented programming. The processing of input data by the processing machine may be in response to user commands, or in response to results of previous processing, or in response to a request made by another processing machine.

The diagrams of embodiments herein may illustrate one or more control or processing units, such as the lighting control unit <NUM>. It is to be understood that the processing or control units may represent circuits, circuitry, or portions thereof that may be implemented as hardware with associated instructions (e.g., software stored on a tangible and non-transitory computer readable storage medium, such as a computer hard drive, ROM, RAM, or the like) that perform the operations described herein. The hardware may include state machine circuitry hardwired to perform the functions described herein. Optionally, the hardware may include electronic circuits that include and/or are connected to one or more logic-based devices, such as microprocessors, processors, controllers, or the like. Optionally, the lighting control unit <NUM> may represent processing circuitry such as one or more of a field programmable gate array (FPGA), application specific integrated circuit (ASIC), microprocessor(s), and/or the like. The circuits in various embodiments may be configured to execute one or more algorithms to perform functions described herein. The one or more algorithms may include aspects of embodiments disclosed herein, whether or not expressly identified in a flowchart or a method.

<FIG> illustrates a perspective bottom view of the lighting assembly <NUM>. In at least one embodiment, the visible light emitter <NUM> includes a first set of visible light emitting elements <NUM> (such as light emitting diodes (LEDs), and a second set of visible light emitting elements <NUM> (such as LEDs). The visible light emitting elements <NUM> are configured to emit light at a first wavelength range, and the visible light emitting elements <NUM> are configured to emit light at a second wavelength range that differs from the first wavelength range. For example, the first wavelength range may be a white light range. As such, the visible light emitting elements <NUM> are configured to emit white light. The second wavelength range may be a disinfecting visible light range, such as between <NUM> - <NUM>. As such, the visible light emitting elements <NUM> are dedicated to emitting solely the disinfecting visible light, while the visible light emitting elements <NUM> emit a wider range of visible light, which may also include the disinfecting visible light.

As shown, the visible light emitting elements <NUM> and <NUM> may be arranged in rows or columns. As another option, the visible light emitting elements <NUM> may be clustered in a first group, while the visible light emitting elements <NUM> may be closeted in a second group. As another example, the visible light emitting elements <NUM> may be interspersed between or otherwise among the visible light emitting elements <NUM> (such as alternately between different elements).

<FIG> illustrates a graph of bacteria levels with respect to time in relation to continuous emission of disinfecting visible light. A continuous light emission curve <NUM> shows that continuous emission of the disinfecting visible light steadily, effectively, and efficiently reduces bacteria levels over time. In contrast, an episodic emission of UV light, as presented by pattern <NUM>, shows that while the UV light may quickly reduce bacteria, because the UV light is intermittently (that is, episodically) emitted, the bacteria regrow until the UV light is emitted at times t1, t2, and t3.

<FIG> illustrates a spectral irradiance graph of a standard illumination mode (for example, a first mode). The standard illumination mode is configured for use when individuals are present. Referring to <FIG>, and <FIG>, the lighting control unit <NUM> operates the lighting assembly <NUM> in the standard illumination mode when the lighting control unit <NUM> determines that an individual is present within the enclosed space <NUM>. As shown, white light <NUM> is emitted during the standard illumination mode. The white light <NUM> includes the disinfecting visible light <NUM> having a first intensity <NUM>. In the standard illumination mode, <NUM> white LEDs, <NUM> LEDs, and <NUM> white LEDs may be activated to emit the visible light shown.

<FIG> illustrates a spectral irradiance graph of an increased disinfecting mode (for example, a second mode). The increased disinfecting mode is configured for use when individuals are not present. Referring to <FIG>, and <FIG>, in the increased disinfecting mode, white light is not emitted. Instead, only the disinfecting visible light <NUM> is emitted. The disinfecting visible light <NUM> can be emitted at an increased second intensity <NUM> as compared to the first intensity <NUM> (shown in <FIG>). For example, the second intensity <NUM> can be four to five times the first intensity. In the increased disinfecting mode, only <NUM> LEDs may be activated to emit the visible light shown.

<FIG> illustrates a spectral irradiance graph of a night light mode (for example, a third mode). Referring to <FIG>, and <FIG>, the night light mode redistributes power among the white light <NUM>, as compared to the white light <NUM> shown in <FIG>. Further, the disinfecting visible light <NUM> can be emitted at an increased third intensity <NUM> (as compared to the first intensity <NUM> shown in <FIG>). For example, the third intensity <NUM> can be twice the first intensity <NUM>. In the night light mode, the <NUM> LEDs and the <NUM> or <NUM> white LEDs may be activated to emit the light shown.

In at least one embodiment, an additional mode includes a <NUM> UVC LED, which may be activated to deliver a quick deactivating disinfectant dose during unoccupied states in a lavatory (such as <NUM> seconds or less), which may quickly (such as within <NUM> seconds) follow opening of the latch or lock (which indicates an unoccupied state). Such a disinfecting mode is well suited for cargo holds or other areas that are typically unoccupied.

Referring to <FIG>, the visible light sanitizing systems and methods are particularly well-suited and useful for areas in which individuals are frequently present and moving, such as within internal cabins of vehicles, such as an aircraft. The disinfecting visible light <NUM> is safe for skin and eyes (at exposures of less than <NUM> continuous hours for adults staring uninterrupted at the source, and a <NUM> hours of continuous exposure for children staring uninterrupted at the source), and can be continuously emitted to reduce microorganisms in the absence of individuals. The lighting control unit <NUM> can automatically operate the lighting assembly <NUM>, as described. In contrast to UV lights, for example, the lighting assembly <NUM> that emits visible light is less costly, and requires little to no maintenance.

<FIG> illustrates a perspective front view of an aircraft <NUM>. The aircraft <NUM> includes a propulsion system <NUM> that includes engines <NUM>, for example. Optionally, the propulsion system <NUM> may include more engines <NUM> than shown. The engines <NUM> are carried by wings <NUM> of the aircraft <NUM>. In other embodiments, the engines <NUM> may be carried by a fuselage <NUM> and/or an empennage <NUM>. The empennage <NUM> may also support horizontal stabilizers <NUM> and a vertical stabilizer <NUM>.

The fuselage <NUM> of the aircraft <NUM> defines an internal cabin <NUM>, which includes a flight deck or cockpit, one or more work sections (for example, galleys, personnel carry-on baggage areas, and the like), one or more passenger sections (for example, first class, business class, and coach sections), one or more lavatories, and/or the like. The internal cabin <NUM> is an example of, or otherwise includes, an enclosed space, such as the enclosed space <NUM> shown in <FIG>.

Alternatively, instead of an aircraft, embodiments not forming part of the claimed subject matter may be used with various other vehicles, such as automobiles, buses, locomotives and train cars, watercraft, and the like. Further, embodiments not forming part of the claimed subject matter may be used with respect to fixed structures, such as commercial and residential buildings.

<FIG> illustrates a top plan view of an internal cabin <NUM> of an aircraft. The internal cabin <NUM> may be within the fuselage <NUM> of the aircraft, such as the fuselage <NUM> of <FIG>. For example, one or more fuselage walls may define the internal cabin <NUM>. The internal cabin <NUM> includes multiple sections, including a front section <NUM>, a first class section <NUM>, a business class section <NUM>, a front galley station <NUM>, an expanded economy or coach section <NUM>, a standard economy of coach section <NUM>, and an aft section <NUM>, which may include multiple lavatories and galley stations. It is to be understood that the internal cabin <NUM> may include more or less sections than shown. For example, the internal cabin <NUM> may not include a first class section, and may include more or less galley stations than shown. Each of the sections may be separated by a cabin transition area <NUM>, which may include class divider assemblies between aisles <NUM>.

The aisles <NUM>, <NUM>, and <NUM> extend to egress paths or door passageways <NUM>. Exit doors <NUM> are located at ends of the egress paths <NUM>. The egress paths <NUM> may be perpendicular to the aisles <NUM>, <NUM>, and <NUM>. The internal cabin <NUM> may include more egress paths <NUM> at different locations than shown. One or more lighting assemblies <NUM>, as shown in <FIG>, are disposed within the internal cabin <NUM>. The lighting assemblies <NUM> may be used to sanitize (with disinfecting visible light) various structures within the internal cabin <NUM>, such as passenger seats, monuments, stowage bin assemblies, components on and within lavatories, galley equipment and components, and/or the like.

<FIG> illustrates a top plan view of an internal cabin <NUM> of an aircraft. The internal cabin <NUM> is an example of the internal cabin <NUM> shown in <FIG>. The internal cabin <NUM> may be within a fuselage <NUM> of the aircraft. For example, one or more fuselage walls may define the internal cabin <NUM>. The internal cabin <NUM> includes multiple sections, including a main cabin <NUM> having passenger seats <NUM>, and an aft section <NUM> behind the main cabin <NUM>. It is to be understood that the internal cabin <NUM> may include more or less sections than shown.

The aisle <NUM> extends to an egress path or door passageway <NUM>. Exit doors <NUM> are located at ends of the egress path <NUM>. The egress path <NUM> may be perpendicular to the aisle <NUM>. The internal cabin <NUM> may include more egress paths than shown. One or more lighting assemblies <NUM>, as shown in <FIG>, are disposed within the internal cabin <NUM>. The lighting assemblies <NUM> may be used to sanitize (with disinfecting visible light) various structures within the internal cabin <NUM>, such as passenger seats, monuments, sidewalls proximate to where passengers were previously sitting, stowage bin assemblies, entryways, crew spaces and berths, cargo areas, components on and within lavatories, galley equipment and components, and/or the like.

<FIG> illustrates a perspective interior view of an internal cabin <NUM> of an aircraft. The internal cabin <NUM> includes outboard walls <NUM> connected to a ceiling <NUM>. Windows <NUM> may be formed within the outboard walls <NUM>. A floor <NUM> supports rows of seats <NUM>. As shown in <FIG>, a row <NUM> may include two seats <NUM> on either side of an aisle <NUM>. However, the row <NUM> may include more or less seats <NUM> than shown. Additionally, the internal cabin <NUM> may include more aisles than shown.

Overhead stowage bin assemblies <NUM> are secured to the ceiling <NUM> and/or the outboard wall <NUM> above and inboard from the PSU <NUM> on either side of the aisle <NUM>. The overhead stowage bin assemblies <NUM> are secured over the seats <NUM>. The overhead stowage bin assemblies <NUM> extend between the front and rear end of the internal cabin <NUM>. Each stowage bin assembly <NUM> may include a pivot bin or bucket <NUM> pivotally secured to a strongback (hidden from view in <FIG>). The overhead stowage bin assemblies <NUM> may be positioned above and inboard from lower surfaces of the PSUs <NUM>. The overhead stowage bin assemblies <NUM> are configured to be pivoted open in order to receive passenger carry-on baggage and personal items, for example.

One or more lighting assemblies <NUM>, as shown in <FIG>, are disposed within the internal cabin <NUM>. The lighting assemblies <NUM> may be used to sanitize (with disinfecting visible light) various structures within the internal cabin <NUM>, such as passenger seats, monuments, stowage bin assemblies, components on and within lavatories, galley equipment and components, and/or the like.

<FIG> illustrates a perspective internal view of a lavatory <NUM> within an internal cabin of a vehicle, such as any of the internal cabins described herein. The lavatory <NUM> is an example of an enclosed space, monument or chamber, such as within the internal cabin a vehicle. The lavatory <NUM> may be onboard an aircraft, as described above. Optionally, the lavatory <NUM> may be onboard various other vehicles. In other embodiments, the lavatory <NUM> may be within a fixed structure, such as a commercial or residential building. The lavatory <NUM> includes a base floor <NUM> that supports a toilet <NUM>, cabinets <NUM>, and a sink <NUM> or wash basin. The lavatory <NUM> may be arranged differently than shown. The lavatory <NUM> may include more or less components than shown. One or more lighting assemblies <NUM>, as shown in <FIG>, are disposed within the lavatory <NUM>. The lighting assemblies <NUM> may be used to sanitize (with disinfecting visible light) various structures within the lavatory <NUM>, such as the base floor <NUM>, the toilet <NUM>, the cabinets <NUM>, the sink <NUM>, and the like.

As described herein, embodiments provide systems and methods for disinfecting surfaces of structures and components that can be safely operated in the presence of humans. Further, embodiments provide systems and methods for safely, efficiently, and effectively neutralizing various microorganisms, such as bacteria and germs.

Also provided are the following illustrative, non-exhaustive examples of further nonclaimed embodiments that are compatible with the claimed subject matter:
In the claimed method, said operating may further comprise operating the lighting assembly <NUM> in a third mode, wherein the disinfecting visible light <NUM> is emitted at a third intensity in the third mode, and wherein the third intensity differs from the first intensity and the second intensity.

The sanitizing method may further comprise: communicatively coupling one or more presence sensors with the lighting control unit <NUM>; detecting, by the one or more presence sensors, a presence of an individual within the area; outputting, by the one or more presence sensors, presence signals to the lighting control unit <NUM>; and selectively switching, by the lighting control unit <NUM>, the lighting assembly <NUM> between different modes based on the presence signals received from the presence sensors.

The sanitizing method may further comprise selectively switching, by the lighting control unit <NUM>, the lighting assembly <NUM> between different modes in response to a toilet being flushed.

The sanitizing method may further comprise selectively switching, by the lighting control unit <NUM>, the lighting assembly <NUM> between different modes in response to a door <NUM> being locked or unlocked.

While various spatial and directional terms, such as top, bottom, lower, mid, lateral, horizontal, vertical, front and the like can be used to describe embodiments, it is understood that such terms are merely used with respect to the orientations shown in the drawings.

It is to be understood that the above description is intended to be illustrative, and not restrictive. For example, the above-described embodiments (and/or aspects thereof) can be used in combination with each other. In addition, many modifications can be made to adapt a particular situation or material to the teachings of the various embodiments. While the dimensions and types of materials described herein are intended to define the parameters of the various embodiments, the embodiments are by no means limiting and are exemplary embodiments. Many other embodiments will be apparent to those of skill in the art upon reviewing the above description. The scope of the claimed embodiments should, therefore, be determined with reference to the appended claims. In the appended claims and the detailed description herein, the terms "including" and "in which" are used as the plain-English equivalents of the respective terms "comprising" and "wherein. " Moreover, the terms "first," "second," and "third," etc. are used merely as labels, and are not intended to impose numerical requirements on their objects.

Claim 1:
A sanitizing system (<NUM>) for an aircraft, said sanitizing system (<NUM>) being configured to disinfect at least one surface within an area of the aircraft, the sanitizing system (<NUM>) comprising:
a lighting assembly (<NUM>) configured to emit a disinfecting visible light (<NUM>) onto the at least one surface, wherein the disinfecting visible light (<NUM>) is configured to neutralize microorganisms on the at least one surface;
a lighting control unit (<NUM>) in communication with the lighting assembly (<NUM>), wherein the lighting control unit (<NUM>) is configured to operate the lighting assembly (<NUM>) to emit the disinfecting visible light (<NUM>),
wherein the lighting control unit (<NUM>) is configured to receive a signal from the aircraft to automatically operate the lighting assembly (<NUM>) at a first setting when the aircraft reaches a cruising altitude and at a second setting during descent of the aircraft.