Sterilizing lighting device
By using collimator and batwing optics in disinfection lighting equipment to process the light distribution of white light and purple light, the problem of indistinguishability of purple light is solved, and a safe and effective disinfection lighting effect in the presence of white light is achieved.
Patent Information
- Application Number
- CN202380052212.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-07-08
- Filing Date
- 2023-06-28
- Publication Date
- 2025-02-25
AI Technical Summary
When existing disinfection lighting equipment is combined with ordinary white light, it is difficult to distinguish between purple light, resulting in the inability to detect whether the disinfection activity is operational, and there is a safety risk.
A disinfection lighting device is designed to emit white light through the first solid-state light source and the second solid-state light source emits purple light in the range of 380-420nm. Using collimator and bat wing optics, the white light is collimated into a white beam with a specific spatial light distribution, and the purple light is shaped into a bat wing-shaped light distribution, so that the maximum intensity angle of purple light is outside the half height and full width of the white beam.
In the presence of white light, light-based disinfection can be performed without losing the ability to distinguish between purple light and white light, and the safety and visibility of disinfected lighting equipment are improved.
Smart Images
Figure CN119522632A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a disinfection lighting device, which is configured to provide device light along a main optical axis. The device light includes one or more of white light, purple light and / or ultraviolet light. The present invention also relates to a lighting system, which includes a lamp and the disinfection lighting device. Background Art
[0002] The health of society is periodically challenged by viral outbreaks, such as seasonal symptomatic influenza A / B outbreaks, SARS, MERS, COVID-19. Future outbreaks, mutations, epidemics, and pandemics cannot be ruled out. Due, at least in part, to population growth, urbanization, and population mobility, the topic of human health and well-being in the built environment is becoming increasingly important.
[0003] These developments have significantly increased the demand for various types of disinfection equipment, such as, for example, disinfection lighting equipment (or: light-based disinfection equipment). Disinfection lighting equipment utilizes the germicidal effect of light of a specific wavelength. For example, it is well known that UV-C radiation has a strong germicidal effect, but can be harmful to humans at certain doses and exposure times.
[0004] Another example is violet light having a main peak wavelength in the wavelength range of 380 to 420 nm. This violet light is also used for disinfection; because compared to the UV-C radiation, violet light is much less harmful to humans and still leads to the inactivation of bacteria and / or viruses.
[0005] However, even though violet light is within the visible spectrum of humans, thus enabling people to detect disinfection with violet light, when combined with (or in some cases: contaminated with) ordinary white light illumination, violet light becomes indistinguishable. This may present a disadvantage in that people can no longer detect whether disinfection activities are currently operational, which is an obvious safety risk.
[0006] There is therefore a clear need to be able to more safely integrate the beneficial effects of disinfection lighting, particularly using violet light, within a building environment that also has a general lighting arrangement. Summary of the invention
[0007] The object of the present invention is to provide an improved disinfection lighting device, which at least alleviates the above-mentioned problems and disadvantages. In addition, the present invention provides a disinfection lighting device, which is configured to provide device light along a main optical axis, and the disinfection lighting device includes: a first solid-state light source, which is configured to emit white light; a second solid-state light source, which is configured to emit violet light with a main peak wavelength in the wavelength range of 380 to 420 nm; a collimator, which is configured to collimate the white light into a white light beam with a first spatial light distribution along the main optical axis, and the first spatial light distribution has a first half-height full width (FWHM1); a batwing optical device, which is configured to shape the violet light into a batwing-shaped light distribution along the main optical axis, wherein the batwing-shaped light distribution has a maximum intensity at an angle (α) relative to the main optical axis; wherein the angle (α) of the maximum intensity of the batwing-shaped light distribution is outside the first half-height full width (FWHM1) of the first spatial light distribution of the white light beam.
[0008] Therefore, the present invention provides a disinfection lighting device (or: in other words, a light-based disinfection device), which is configured to provide (or: emit) device light along a main optical axis (or: centered on the main optical axis). The main optical axis can alternatively be defined as a central optical axis. The device light includes the white light and the violet light. The first solid-state light source emits white light in operation. The second solid-state light source emits violet light in operation. The collimator collimates the white light into a white beam having a first spatial light distribution along the main optical axis, and the first spatial light distribution has a first full width at half maximum (FWHM1). The batwing optical device shapes the violet light into a batwing light distribution along the main optical axis. The shape of the batwing light distribution is also well known in the art. In other words; the batwing optical device can shape the violet light into a violet beam having a batwing light distribution along the main optical axis.
[0009] The terms 'spatial light distribution' and its 'full width at half maximum' are well known in the field of lighting. That is: the spatial light distribution (of a light beam) is usually defined by the light intensity as a function of the angle (relative to the main optical axis, e.g. the main optical axis is referenced to 0 degrees). Then the 'full width at half maximum' is the full width of such spatial light distribution at half of the maximum value. Therefore, the 'full width at half maximum' of a spatial light distribution is usually defined as an angle or an angle range value. Furthermore, the associated term "half angle" (HA) is also well known in the field of lighting. "Half angle" refers to the angle (within the corresponding spatial light distribution) at which the light intensity drops to half of its maximum value. For example, the full width at half maximum of a bell-shaped spatial light distribution (e.g. FWHM of 60 degrees) can be defined between a first half angle (e.g. -30 degrees relative to the main optical axis) and a second half angle (e.g. +30 degrees relative to the main optical axis).
[0010] However, in a further alternative wording, the feature 'wherein said angle (α) of maximum intensity of the batwing light distribution is outside said first full width at half maximum (FWHM1) of the first spatial light distribution of the white light beam' can also be expressed as: 'wherein said angle (α) of maximum intensity of the batwing light distribution is greater than the angle (β, alternatively: HA1, HA2) at which the light intensity of the first spatial light distribution of the white light beam drops to half of its maximum value'.
[0011] The second solid-state light source is preferably configured to emit violet light having a main peak wavelength within a wavelength range of 400 nm to 420 nm.
[0012] For convenience, the angle (α) may be expressed as a purple angle or a batwing angle throughout the application.
[0013] As mentioned, the collimator of the present invention collimates white light into a white light beam having a first spatial light distribution with a first full width at half maximum (FWHM1); and the batwing optics shapes violet light into a batwing-shaped light distribution along the main optical axis.
[0014] Because the angle of maximum intensity (α) of the batwing light distribution is outside the first full width at half maximum (FWHM1) of the first spatial light distribution of the white light beam, the present invention advantageously provides a device light having white light (i.e., suitable for general illumination) and violet light (i.e., suitable for disinfection); but enables the corresponding spatial light distribution to perform light-based disinfection in the presence of white light without losing the ability to distinguish between violet light and white light. That is, due to the batwing light distribution, the violet light will be visible to a human observer as a halo around the white light.
[0015] More specifically, the device light including the white light beam may present a white light spot, while the device light including the violet light beam may present an annular light pattern. Therefore, since the violet light is shaped into a batwing-shaped light distribution along the main optical axis, the batwing-shaped light distribution is provided (or: projected) as an annular light pattern surrounding the white light spot provided (or: projected) by the white light beam. Therefore, the device light according to the present invention presents violet light with an annular light pattern surrounding the white light spot.
[0016] As mentioned, the angle of maximum intensity (α) of the batwing light distribution is outside the first full width at half maximum (FWHM1 ) of the first spatial light distribution of the white light beam.
[0017] In certain embodiments, when the angle (α) of the batwing light distribution is taken as given, the first full width at half maximum (FWHM1) may be set relative to the angle (α), according to the teachings of the present invention. In certain embodiments, when the first full width at half maximum (FWHM1) is taken as given, the angle (α) of the batwing light distribution may be set relative to the FWHM1, according to the teachings of the present invention. Taking the former into account, the angle (α) of the maximum intensity of the batwing light distribution is preferably greater than 25 degrees, more preferably greater than 40 degrees, and most preferably greater than 50 degrees. However, the angle (α) may be less than 60 degrees, so as to prevent glare (caused by too wide a beam angle of the angle (α)). In all cases, according to the present invention, the angle (α) of the maximum intensity of the batwing light distribution is outside the first full width at half maximum (FWHM1) of the first spatial light distribution of the white light beam.
[0018] In an embodiment, the angle (α) of maximum intensity of the batwing light distribution may be at least 5 degrees outside the first full width at half maximum (FWHM1). Preferably, the angle (α) of maximum intensity of the batwing light distribution may be at least 10 degrees outside the first full width at half maximum (FWHM1), more preferably at least 15 degrees, most preferably at least 20 degrees.
[0019] Such an embodiment is advantageous because violet light may be more easily distinguishable from white light as a larger 'distance' is created between the maximum (or: peak) intensity of the batwing light distribution (occurring at the angle α) and the first full width at half maximum (FWHM1) of the first spatial light distribution of the white light beam.
[0020] In other words, violet light may be more easily distinguished from white light when a greater 'distance' is created between the maximum (or: peak) intensity of the batwing light distribution and the half angle of FWHM1 of the first spatial light distribution across the white light beam.
[0021] In an embodiment, the angle of maximum intensity of the batwing light distribution may be twice (or two times, or twice) greater than the first full width at half maximum (FWHM1) plus 10 degrees. In other words, in more mathematical terms, 2α>FWHM1+10 degrees. Preferably, 2α>FWHM1+20 degrees. Such an embodiment advantageously presents the effect of higher contrast and / or improved visibility of purple light relative to white light (of the provided device light).
[0022] In an embodiment, the first full width at half maximum (FWHM1) may be at most 60 degrees. The first full width at half maximum may preferably be at most 40 degrees, or more preferably at most 20 degrees, most preferably at most 15 degrees. Such a FWHM1 range may be suitable for downlight and / or spotlight applications. Such an embodiment advantageously presents a more collimated (narrow) white light beam, thereby preventing glare. For example, this may be advantageous for disinfection lighting devices that require a narrow beam in their implementation, such as for high-altitude disinfection that requires emitting light along, for example, a ceiling surface.
[0023] In a related embodiment, the first full width at half maximum (FWHM1) may be defined between a first half angle (HA1) and a second half angle (HA2) of the first spatial light distribution; wherein the first half angle (HA1) is at most -30 degrees relative to the main optical axis; wherein the second half angle (HA2) is at most 30 degrees relative to the main optical axis. Preferably, the first half angle (HA1) is at most -12.5 degrees relative to the main optical axis; wherein the second half angle (HA2) is at most 12.5 degrees relative to the main optical axis.
[0024] In various aspects, the angle (α) of maximum intensity of the batwing light distribution may be between at least 10 and 20 degrees outside the first full width at half maximum (FWHM1).Thus, the violet light may appear as a clear ring or halo around the white light.
[0025] In an embodiment, the first spatial light distribution may be substantially a symmetrical light distribution with a maximum intensity at zero degrees relative to the main optical axis. Such an embodiment may present an optimal (white light) illumination performance. In a further embodiment thereof, the first spatial light distribution may be substantially a normal distribution. The normal distribution may alternatively be expressed as a Gaussian distribution or a bell curve. Thus, the first spatial light distribution may include a maximum value or a main peak centered on the main optical axis.
[0026] In an embodiment, the angle (α) of maximum intensity of the batwing light distribution may be at most +25 degrees or at most -25 degrees relative to the main optical axis. Such an embodiment may present a more collimated (narrow) violet light beam, thereby preventing glare.
[0027] As mentioned, the batwing optical device is configured to shape the purple light into a batwing-shaped light distribution along the main optical axis. In other words, the batwing light distribution according to the present invention may include a second full width at half maximum (FWHM2). According to the present invention, in other words, the second full width at half maximum (FWHM2) may be greater than the first full width at half maximum (FWHM1). Therefore, FWHM2>FWHM1. Moreover, in some examples, as mentioned in the above section, FWHM2>FWHM1+10 degrees. In some examples, the batwing-shaped light distribution may include a second full width at half maximum (FWHM2) of up to 50 degrees.
[0028] The disinfection performance of violet light generally increases with its lower wavelength in the violet wavelength range, while the visibility of violet light generally increases with its higher wavelength in the violet wavelength range. The present invention can optimize the disinfection performance of violet light by utilizing the visibility of violet light in the presence of white light. Therefore, in an embodiment of the present invention, violet light may have a main peak wavelength in the wavelength range of 400nm to 415nm. Preferably, violet light may have a main peak wavelength at a wavelength of 405nm. When used for disinfection, this specific wavelength of 405nm may be safe for humans while still providing effective bactericidal, sterilizing and / or virucidal effects.
[0029] In an embodiment, the disinfection lighting device may include a third solid-state light source configured to emit violet light. The third solid-state light source may be, for example, an ultraviolet (UV) light source. Therefore, the device light may also include ultraviolet light.
[0030] In an embodiment, the light-based disinfection device may include a third solid-state light source having an ultraviolet light source configured to emit a main peak wavelength in a wavelength range of 100 nm to 380 nm; and an optical element configured to collimate and / or shape the ultraviolet light into an ultraviolet light beam along the main optical axis. Although ultraviolet light is effective in killing pathogens such as bacteria, ultraviolet light may increase the effectiveness of inactivating viral substances. Therefore, such an embodiment can improve the sterilization effect or disinfection performance of the disinfection lighting device according to the present invention.
[0031] In a first related embodiment, the optical element may be configured to collimate the ultraviolet light into an ultraviolet light beam having a third spatial light distribution along a principal optical axis; wherein the third spatial light distribution may be substantially a symmetrical light distribution having a maximum intensity at zero degrees relative to the principal optical axis. In an example, the optical element may be a collimator.
[0032] Such an embodiment may be advantageous: because the batwing-shaped light distribution of violet light presents violet light of lower intensity at angles closer to the main optical axis, thereby presenting lower disinfection performance closer to the main optical axis, a substantially symmetrical third spatial light distribution of ultraviolet light having a maximum intensity at zero degrees relative to the main optical axis can provide disinfection performance closer to the main optical axis, thereby resolving and / or supplementing the lower disinfection performance of violet light closer to the main optical axis. Therefore, the device light including white light, violet light and ultraviolet light provides improved disinfection performance (spatial light distribution with improved disinfection performance). In other words, the ultraviolet light compensates for the violet light that is not present (to a certain extent) in the center of the white light and the first (white light) spatial light distribution.
[0033] In a second related embodiment, the optical element can be configured to shape the ultraviolet light into a batwing-shaped light distribution along the main optical axis, which batwing-shaped light distribution has a maximum intensity at another angle relative to the main optical axis; wherein the other angle is within 10 degrees of the angle (α) of maximum intensity of the batwing-shaped light distribution of the ultraviolet light.
[0034] In an example, the further angle may be within 8 degrees, preferably within 5 degrees, most preferably within 3 degrees of the angle (α) of maximum intensity of the batwing light distribution of violet light. In an example, the further angle may be the same as the angle (α) of maximum intensity of the batwing light distribution of violet light. In an example, the optical element may be the batwing optics.
[0035] Such an embodiment may be advantageous because, since the UV light is also shaped into a batwing light distribution, i.e., within 10 degrees and / or the same as the batwing light distribution of the violet light, the UV light may complement the violet light in disinfection. Moreover, the violet light may also be an indicator of (more dangerous) UV light that would otherwise be invisible to humans. Thus, in such embodiments and examples, the violet light may visualize the UV light.
[0036] Additionally or alternatively, in an embodiment, the ultraviolet light may have a main peak wavelength within a wavelength range of 100 nm to 280 nm. Thus, the ultraviolet light may include UV-C light.
[0037] In additional or alternative examples, the ultraviolet light may have a main peak wavelength within a wavelength range of 280 nm to 315 nm. Thus, the ultraviolet light may include UV-B light.
[0038] In an embodiment, the light-based disinfection device and the disinfection lighting device may include a controller; wherein the controller is configured to individually control the light intensity of the first solid-state light source, the second solid-state light source, and / or the third solid-state light source.
[0039] In a related embodiment, the controller may be configured to obtain a control signal; wherein the controller may be configured to control at least one second solid-state light source to provide purple light when obtaining the control signal.
[0040] In a related embodiment, the disinfection lighting device may include a sensor for sensing a parameter of a person; wherein the sensor is configured to generate a control signal when the parameter of the person is sensed, and communicate the control signal to the controller. In an embodiment, the parameter may be the presence of a person and / or the movement of a person and / or the proximity of a person. The sensor may be, for example, at least one of the following: a camera, a PIR sensor, a thermopile array sensor, a single pixel thermopile, a pressure sensor, a microwave sensor, a radar sensor, an RF transceiver capable of RF-based sensing.
[0041] Such an embodiment may enhance safety because when, for example, the presence of a person is detected, a white beam may be provided to a purple light with a batwing-shaped light distribution, thereby presenting a (light-based) disinfection activity in the presence of a person who may visually detect (or: observe) the disinfection activity.
[0042] In an embodiment, the sensor comprises a detection area, the device light comprises a main illumination area (or: footprint), wherein the detection area of the sensor is larger than the main illumination area. This allows a person to visually detect the device light due to the purple light and the white light before entering the main illumination area and / or footprint of the light.
[0043] In an embodiment, the controller may be configured to control at least one second solid-state light source to provide violet light having a pulse intensity profile with a pulse frequency between 0.05 Hz and 20 Hz. Such an embodiment may be advantageous because dynamic violet light (i.e., having a pulse intensity profile) may enhance the distinction between violet light and white light. The pulse frequency may preferably be between 0.2 Hz and 5 Hz.
[0044] In addition, while controlling at least one second solid-state light source to provide purple light having the pulse intensity profile, the controller can control at least one first solid-state light source to provide white light (and the resulting white light beam) having a stable (or static, or constant) intensity profile.
[0045] In various aspects, the light-based disinfection device may include a presence sensor, a motion sensor and / or a proximity sensor; wherein the disinfection lighting device may also be configured to provide device light for a predetermined duration and / or a predetermined intensity based on the presence of a person detected by the presence sensor, motion sensor and / or proximity sensor; and wherein when a person is within a threshold distance from the proximity sensor, the device light is not provided (e.g., turned off).
[0046] The first solid-state light source may be at least one first solid-state light source. The second solid-state light source may be at least one second solid-state light source. The third solid-state light source may be at least one third solid-state light source. The solid-state light source according to the present invention may be, for example, an LED light source.
[0047] In various aspects, the violet light may be more prominent. Thus, in various aspects, the maximum intensity of the batwing light distribution of violet light may be at least 1.5 times higher, such as 2 times higher, than the maximum intensity of the first spatial light distribution of white light (beam). This may make the violet light more visible within the white light, as the contrast may be improved. Furthermore, the factor may remain constant while dimming the white light relative to the violet light.
[0048] The object of the present invention is further to provide an improved lighting system, which at least alleviates the above mentioned problems and disadvantages. In addition, the present invention provides a lighting system, comprising a lamp housing and the disinfection lighting device, wherein the lamp housing comprises the disinfection lighting device.
[0049] In a further embodiment, the lighting system may be one of the following: a spotlight, an LED panel, an LED bulb, a downlight. Therefore, the advantages and / or embodiments applicable to the disinfection lighting device according to the present invention may be applicable to the lighting system according to the present invention after mutatis mutandis modifications in details.
[0050] The object of the present invention is further to provide an improved method, which at least alleviates the above-mentioned problems and disadvantages. In addition, the present invention provides a method for providing device light along a main optical axis, wherein the method comprises: emitting white light; emitting violet light having a main peak wavelength in the wavelength range of 380nm to 420nm; collimating the white light into a white light beam having a first spatial light distribution along the main optical axis, the first spatial light distribution having a first half-height full width (FWHM1); shaping the violet light into a batwing light distribution along the main optical axis, wherein the batwing light distribution has a maximum intensity at an angle (α) relative to the main optical axis; wherein the angle (α) of the maximum intensity of the batwing light distribution is outside the first half-height full width (FWHM1) of the first spatial light distribution of the white light beam. Thus, the advantages and / or embodiments applicable to the disinfection lighting device according to the present invention can be applied to the method according to the present invention after necessary modifications in details.
[0051] In various aspects, in other words, the present invention provides a light-based disinfection device for emitting device light along a main optical axis, wherein the light-based disinfection device includes: at least one first solid-state light source configured to provide white light; at least one second solid-state light source configured to provide violet light having a main peak wavelength in a wavelength range of 380nm to 420nm; a collimator configured to collimate the white light into a white light beam having a first spatial light distribution along the main optical axis, the first spatial light distribution having a first full width at half maximum (FWHM); a batwing optical device configured to shape the violet light into a batwing-shaped light distribution along the main optical axis; wherein at least one peak intensity of the batwing-shaped light distribution is at a certain angle outside the first full width at half maximum (FWHM) of the first spatial light distribution of the white light beam. BRIEF DESCRIPTION OF THE DRAWINGS
[0052] The invention will now be further elucidated with the aid of the schematic, non-limiting accompanying drawings:
[0053] Figure 1 schematically depicts an embodiment of a lighting system according to the invention;
[0054] Figure 2 An embodiment of a disinfection lighting device according to the present invention is schematically depicted;
[0055] Figure 3 An embodiment of a disinfection lighting device according to the present invention is schematically depicted;
[0056] Figure 4 An embodiment of the method according to the invention is schematically depicted. DETAILED DESCRIPTION
[0057] It is known that violet light provides a germicidal effect while being safe for humans. Violet light can generally inactivate not only bacteria but also viruses. Therefore, violet light is often used for (light-based) disinfection.
[0058] However, even though violet light is within the visible spectrum of humans, thereby enabling people to detect disinfection with violet light, when combined with (or in some cases: contaminated with) ordinary white light illumination, violet light becomes indistinguishable. This may have the disadvantage that people can no longer detect whether disinfection activities are currently operational, which is an obvious safety risk.
[0059] There is a clear need to be able to more safely integrate the beneficial effects of disinfection lighting, particularly utilizing violet light, within a building environment that also has general lighting arrangements that typically emit white light.
[0060] This need is met by the lighting system, disinfection lighting device and associated method according to the present invention.The invention will be explained and elucidated with reference to the accompanying drawings.
[0061] Figure 1 An embodiment of a lighting system 100 according to the present invention is schematically depicted by way of non-limiting example. The lighting system 100 comprises a lamp housing 101 and a disinfecting lighting device 10. The lamp housing 101 comprises (or: accommodates) a disinfecting lighting device 10.
[0062] The disinfection lighting device 10 may be, for example, Figure 2 The disinfection lighting device 10 schematically depicted in Figure 3 Schematically depicted in the disinfection lighting device 30, as described in more detail below.
[0063] Here, the lighting system 100 is a spotlight. Alternatively, the lighting system can be one of the following: a downlight, an LED panel, an LED bulb, a troffer light fixture, a recessed ceiling light fixture, an upper air disinfecting light fixture configured to provide equipment light substantially parallel to a surface, an overhead light fixture.
[0064] Reference Figure 1 , the disinfection lighting device 10 of the lighting system 100 provides device light 12 along the main optical axis 11. Here, the device light 12 includes white light 5 and purple light 7.
[0065] Still refer to Figure 1 , the white light 5 comprises a main illumination area presenting a white light footprint area 55 on the surface below the spotlight 100. The purple light 7 comprises a main illumination area presenting a purple light footprint area 77 on the surface below the spotlight 100. More specifically, the device light 12 according to the present invention presents the purple light 7 with a ring light pattern around the spot of the white light 5.
[0066] Figure 2 An embodiment of a disinfection lighting device 10 according to the present invention is schematically depicted by way of non-limiting example. As mentioned, the disinfection lighting system 10 may be Figure 1 A portion of the lighting system depicted.
[0067] The disinfection lighting device 10 comprises a first solid-state light source 1. The first solid-state light source 1 is configured to emit white light 5 in operation. White light 5 is known to those skilled in the art. The white light 5 may be referred to as visible light. The white light 5 may have a spectrum within the visible spectrum of humans.
[0068] The disinfection lighting device 10 also includes a second solid-state light source 2. The second solid-state light source 2 is configured to emit violet light 7 in operation. The violet light 7 has a main peak wavelength in the wavelength range of 380nm to 420nm. When used for disinfection, the violet light 7 may be safe for humans while still providing effective bactericidal, sterilizing and / or virucidal effects.
[0069] The disinfection performance of the violet light 7 generally increases with its lower wavelength in the violet wavelength range, while the visibility of the violet light 7 generally increases with its higher wavelength in the violet wavelength range. The present invention can optimize the disinfection performance of the violet light 7 by utilizing the visibility of the violet light 7 in the presence of the white light 5. Therefore, alternatively, in other preferred embodiments, the violet light 7 may have a main peak wavelength in the wavelength range of 400nm to 415nm, for example 405nm.
[0070] Still refer to Figure 2 The disinfection lighting device 10 is configured to provide device light 12 along a main optical axis 11 (or: centered on the main optical axis 11). The main optical axis 11 can alternatively be defined as a central optical axis. Here, the device light 12 includes white light 5 and purple light 7.
[0071] The disinfection lighting device 10 also includes a collimator 3. The collimator collimates the white light 5 (included in the device light 12) along the main optical axis 11 into a white light beam having a first spatial light distribution 50. The first spatial light distribution 50 has a first full width at half maximum 6 (FWHM1). The white light beam can also be referenced by the numerical symbol 5.
[0072] The term 'spatial light distribution' and its 'full width at half maximum' are well known in the field of lighting. That is: the spatial light distribution (of a light beam) is usually defined by the light intensity as a function of the angle (relative to the main optical axis 11, for example the main optical axis 11 is a 0 degree reference). Then the 'full width at half maximum' is the full width of such spatial light distribution at half of the maximum value. Therefore, the 'full width at half maximum' of a spatial light distribution is usually defined as an angle or an angle range value. In addition, the associated term "half angle" (HA) is also well known in the field of lighting. "Half angle" refers to the angle (within the corresponding spatial light distribution) at which the light intensity drops to half of its maximum value.
[0073] Still refer to Figure 2 , the first spatial light distribution 50 of the white light beam 5 has a first full width at half maximum 6 (FWHM1). Here, the first full width at half maximum 6 (FWHM1) is at most 60 degrees, that is, 30 degrees, spanning a first half angle (HA1) of 15 degrees and a second half angle (HA2) of -15 degrees relative to the main optical axis 11. Alternatively, the first full width at half maximum (FWHM1) may be at most 25 degrees. However, alternatively, the first full width at half maximum (FWHM1) may be 60 degrees, spanning an angle of -30 degrees and +30 degrees relative to the main optical axis.
[0074] Furthermore, the first spatial light distribution 50 of the white light beam 5 is substantially a symmetrical light distribution having a maximum intensity 51 at zero degrees relative to the main optical axis 11. Therefore, the white light 5 can be collimated into a narrow and symmetrical white light beam, thereby preventing glare and providing a desired white light distribution for a spotlight (or: point light source).
[0075] Still refer to Figure 2 , the disinfection lighting device 10 also includes a batwing optical device 4. The batwing optical device 4 shapes the purple light 7 of the second solid-state light source 2 into a batwing-shaped light distribution 70 along the main optical axis 11. The shape of the batwing light distribution is generally known in the art. Here, the batwing-shaped light distribution 70 has a maximum intensity 8, 8' at an angle 9 (α) relative to the main optical axis 11. The angle 9 (α) is +50 degrees (and / or -50 degrees) relative to the main optical axis 11.
[0076] More specifically, the maximum intensity can be a batwing-shaped first maximum intensity 8, which has a positive angle 9 (α) relative to the main optical axis 11, i.e., +50 degrees; or its counterpart (batwing-shaped second maximum intensity 8'), having a negative angle, i.e., -50 degrees, this maximum being referenced by the number 8'.
[0077] Still refer to Figure 2According to the present invention, the angle 9(α) of the maximum intensity of the batwing light distribution 70 is outside the first full width at half maximum 6 (FWHM1) of the first spatial light distribution 50 of the white light beam. That is, the angle 9(α) of the maximum intensity 8 of the batwing light distribution 70 is +50 degrees (or: -50 degrees) relative to the main optical axis 11, while the first full width at half maximum 6 (FWHM1) spans -15 degrees and +15 degrees relative to the main optical axis 11. Therefore, the angle 9(α) of the maximum intensity 8 of the batwing light distribution 70 is obviously outside the first full width at half maximum (FWHM1).
[0078] Because the angle (α) of the maximum intensity 8 of the batwing light distribution 70 is outside the first full width at half maximum 6 (FWHM1) of the first spatial light distribution 50 of the white light beam, the present invention advantageously provides an apparatus light 12 having white light 5 (i.e., suitable for general illumination) and violet light 7 (i.e., suitable for disinfection); but enables the corresponding spatial light distributions 50, 70 to perform light-based disinfection in the presence of white light 5 without losing the ability to distinguish between violet light 7 and white light 5.
[0079] That is, due to the batwing-shaped light distribution 70, the violet light 7 will be visible to a human observer, for example as a halo around the white light 5. This is also respectively Figure 1 And the corresponding footprints of white light 5 and purple light 7 are depicted in 55 and 77.
[0080] More specifically, considering the device light 12 provided by the disinfection lighting device 10, when a greater 'distance' is created between the maximum 8, 8' intensity of the batwing-shaped light distribution 70 occurring at the angle 9 (α) and the first full width at half maximum 6 (FWHM1) of the first spatial light distribution 50 of the white light beam, the purple light 7 may be more easily distinguished from the white light 5. Therefore, in this embodiment, as Figure 2 As depicted, although not required, the angle 9 (α) of the maximum intensity 8 of the batwing light distribution 70 is at least 20 degrees outside of the first full width at half maximum 6 (FWHM1 ).
[0081] In an alternative example, the angle of maximum intensity of the batwing light distribution may be at most +25 degrees and / or at most -25 degrees relative to the main optical axis. Such an embodiment may present a more collimated (narrow) violet light beam, thereby preventing glare. Therefore, the first half-height full width (FWHM1) should be less than the angle -25 degrees and / or +25 degrees relative to the main optical axis.
[0082] In an alternative example, double the angle 9 (α) of maximum intensity of the batwing light distribution 70 may be greater than the first full width at half maximum 6 (FWHM1) plus 10 degrees. Figure 2, FWHM1+10 degrees is 40 degrees in total. Thus, the angle α may be at least 20 degrees relative to the principal optical axis 11. (In other words, in more mathematical terms, 2α>FWHM1+10 degrees. Such an embodiment advantageously presents the effect of higher contrast and / or improved visibility of purple light relative to white light (of the provided device light).
[0083] Alternatively, the batwing light distribution may include a second full width at half maximum (FWHM2). According to the present invention, the second full width at half maximum (FWHM2) may be outside the first full width at half maximum (FWHM1). Therefore, FWHM2>FWHM1. In addition, in some alternative examples, as mentioned in the above section, FWHM2>FWHM1+10 degrees.
[0084] Figure 3 An embodiment of a disinfection lighting device 20 according to the present invention is schematically depicted by way of non-limiting example, which is similar to Figure 2 , but additionally includes a third solid-state light source 23, an optical element 24, optionally a controller 27 and a sensor 28. The disinfection lighting device 20 is configured to provide device light 123. Here, the device light 123 includes white light 5, violet light 7 and ultraviolet light 13.
[0085] The ultraviolet light 13 has a main peak wavelength that may be within a wavelength range of 100 to 280 nm. Therefore, the ultraviolet light 13 may include UV-C light. In additional or alternative examples, the ultraviolet light 13 may have a main peak wavelength within a wavelength range of 280 nm to 315 nm. Therefore, the ultraviolet light 13 may include UV-B light.
[0086] Further references Figure 3 , the third solid-state light source 23 is configured to emit ultraviolet light 13 having a main peak wavelength in the wavelength range of 100 nm to 380 nm in operation. The optical element 24 is configured to collimate and / or shape the ultraviolet light 13 into an ultraviolet light beam along the main optical axis 11. The ultraviolet light beam has a third spatial light distribution 25. Here, the third spatial light distribution 25 is a substantially symmetrical light distribution having a (single) maximum intensity 26 at zero degrees relative to the main optical axis 11. Here, the third spatial light distribution 25 is different from the first spatial light distribution 50 of the white light 5, but alternatively can be the same.
[0087] That is, in an alternative embodiment, the optical element 24 may be at least partially identical to the collimator 3. In such an alternative example, the third spatial light distribution of the ultraviolet light 13 may be identical to the first spatial light distribution 50 of the white light (beam) 5.
[0088] Figure 3The depicted embodiments and the alternative embodiments may be advantageous: because the bat-wing-shaped light distribution 70 of the ultraviolet light 7 presents a lower intensity of the ultraviolet light 7 at an angle closer to the main optical axis 11, thereby presenting a lower disinfection performance closer to the main optical axis 11, a substantially symmetrical third spatial light distribution 25 of the ultraviolet light 13 having a maximum intensity 26 at zero degrees relative to the main optical axis 11 can provide disinfection performance closer to the main optical axis 11, thereby resolving and / or supplementing the lower disinfection performance of the ultraviolet light 7 closer to the main optical axis 11.
[0089] Therefore, the device light 123 including white light 5, violet light 7 and ultraviolet light 13 provides improved disinfection performance (spatial light distribution with improved disinfection performance). In other words, the ultraviolet light 13 compensates for the violet light 7 that is not present (to a certain extent) in the center of the spatial light distribution of the white light 5 and the first (white light) spatial light distribution 50.
[0090] Alternatively, the optical element 24 may be at least partially identical to the batwing optical device 4. In such an example, the optical element may shape the ultraviolet light 13 along the main optical axis 11 into a batwing-shaped light distribution having a maximum intensity at another angle relative to the main optical axis 11. Figure 2 As mentioned in the discussion of , the other angle can be at most 10 degrees from the angle 9(α) of the maximum intensity of the batwing light distribution 70 of the purple light 7. In addition, the other angle can be the same as the angle 9(α) of the maximum intensity of the batwing light distribution 70 of the purple light 7. Therefore, the third spatial light distribution of the ultraviolet light 13 can be similar to or the same as the batwing light distribution 70. Such an embodiment may be advantageous because, since the ultraviolet light is also shaped into a batwing light distribution, i.e., within 10 degrees and / or the same as the batwing light distribution of the purple light, the ultraviolet light can supplement the purple light in disinfection. In addition, the purple light may also be an indicator for (more dangerous) ultraviolet light, which is otherwise invisible to humans. Therefore, in such embodiments and examples, the purple light can visualize the ultraviolet light.
[0091] Still refer to Figure 3 As mentioned, the disinfection lighting device 20 also optionally includes a controller 27 and a sensor 28. The controller 27 is configured to individually control the light intensity of the first solid-state light source 1, the second solid-state light source 2, and / or the third solid-state light source 23. The controller is also configured to obtain a control signal. This can be a controller receiving or retrieving a control signal via a wired and / or wireless communication modality. The controller thus controls the second solid-state light source 2 to provide purple light 7 when obtaining the control signal. Here, the control signal can be communicated from a sensor device to the controller. Alternatively, the control signal can be communicated to the controller from a user control device, such as a remote control device, a user interface, a smart phone device, a tablet device, a computer, a portable smart device, etc.
[0092] That is, the disinfection lighting device 20 includes a sensor 28 for sensing a parameter of a person. The parameter may be the presence of a person and / or the movement of a person and / or the proximity of a person. Alternatively, the parameter may be a user preference, a user activity of a person, or a user condition. Here, the parameter is the presence of a person. The sensor 28 is thus configured to generate a control signal when the parameter of the person is sensed, and the control signal is communicated to the controller 27. The controller 27 then controls the second solid-state light source 2 to provide the purple light 7. The sensor may be, for example, at least one of the following: a camera, a PIR sensor, a thermopile array sensor, a single-pixel thermopile, a pressure sensor, a microwave sensor, a radar sensor, an RF transceiver capable of RF-based sensing.
[0093] Such operation may enhance safety because when, for example, the presence of a person is detected, a white beam may be provided to a purple light with a batwing light distribution, thereby presenting a (light-based) disinfection activity in the presence of a person who may visually detect (or: observe) the disinfection activity.
[0094] Figure 4 A method 30 of providing device light along a main optical axis according to the invention is schematically depicted by way of non-limiting example. The method 30 may be performed by a lighting system 100 and / or a disinfection lighting device 10, 20 according to the invention.
[0095] Method 30 includes a step 31 of emitting white light and a step 32 of emitting violet light having a main peak wavelength in a wavelength range of 380 nm to 420 nm. The method also includes a step 33 of collimating the white light into a white light beam having a first spatial light distribution along a main optical axis, the first spatial light distribution having a first full width at half maximum (FWHM1). The method also includes a step 34 of shaping the violet light into a batwing light distribution along the main optical axis, wherein the batwing light distribution has a maximum intensity at an angle (α) relative to the main optical axis. The method is also characterized in that the angle of maximum intensity of the batwing light distribution is outside the first full width at half maximum (FWHM1) of the first spatial light distribution of the white light beam. The first spatial light distribution is a substantially symmetrical light distribution having a maximum intensity at zero degrees relative to the main optical axis.
[0096] The method 30 may optionally include a step 35 of emitting ultraviolet light and a step 36 of collimating and / or shaping the ultraviolet light into a third spatial light distribution. The third spatial light distribution is a substantially symmetrical light distribution having a maximum intensity at zero degrees relative to the principal optical axis.
Claims
1. A disinfection lighting device, configured to provide device light along a main optical axis, the disinfection lighting device comprising: a first solid-state light source configured to emit white light; a second solid-state light source configured to emit violet light having a main peak wavelength within a wavelength range of 380 nm to 420 nm; a collimator configured to collimate the white light into a white light beam having a first spatial light distribution along the main optical axis, wherein the first spatial light distribution has a first full width at half maximum (FWHM1); a batwing optical device configured to shape the purple light into a batwing-shaped light distribution along the primary optical axis, wherein the batwing-shaped light distribution has a maximum intensity at an angle (α) relative to the primary optical axis; The angle (α) of the maximum intensity of the batwing-shaped light distribution is outside the first full width at half maximum (FWHM1) of the first spatial light distribution of the white light beam. 2 . The disinfection lighting device according to claim 1 , wherein the angle (α) of the maximum intensity of the batwing-shaped light distribution is at least 10 degrees outside the first full width at half maximum (FWHM1 ). 3 . The disinfection lighting device according to claim 1 , wherein double the angle (α) of the maximum intensity of the batwing-shaped light distribution is greater than the first full width at half maximum (FWHM1) plus 10 degrees.
4. The disinfection lighting device according to any one of the preceding claims, wherein the first full width at half maximum (FWHM1) is at most 60 degrees, preferably at most 25 degrees.
5. The disinfection lighting device according to any one of the preceding claims, wherein the first spatial light distribution is a substantially symmetrical light distribution having a maximum intensity at zero degrees relative to the main optical axis. 6 . The disinfection lighting device according to claim 1 , wherein the violet light has a main peak wavelength within a wavelength range of 400 nm to 415 nm.
7. The disinfection lighting device according to any one of the preceding claims, wherein the light-based disinfection device comprises a third solid-state light source configured to emit ultraviolet light having a main peak wavelength in the wavelength range of 100 nm to 380 nm; and The optical element is configured to collimate and / or shape the ultraviolet light into an ultraviolet light beam along the main optical axis.
8. The disinfection lighting device according to claim 7, wherein the optical element is configured to collimate the ultraviolet light into an ultraviolet light beam having a third spatial light distribution along the main optical axis; The third spatial light distribution is substantially a symmetrical light distribution having a maximum intensity at zero degrees relative to the main optical axis.
9. The disinfection lighting device according to claim 7, wherein the optical element is configured to shape the ultraviolet light into a batwing-shaped light distribution along the main optical axis, the batwing-shaped light distribution having a maximum intensity at another angle relative to the main optical axis; Wherein the another angle is within 10 degrees of the angle of the maximum intensity of the batwing-shaped light distribution of the purple light.
10. The disinfection lighting device according to any one of the preceding claims 7 to 9, wherein the ultraviolet light has a main peak wavelength within a wavelength range of 100 nm to 280 nm.
11. The disinfection lighting device according to any one of the preceding claims, wherein the disinfection lighting device comprises a controller; Wherein the controller is configured to individually control the light intensity of the first solid-state light source, the second solid-state light source and / or the third solid-state light source.
12. The disinfection lighting device according to claim 11, wherein the controller is configured to obtain a control signal; The controller is configured to control the second solid-state light source to provide the purple light when obtaining the control signal.
13. The disinfection lighting device of claim 12, wherein the light-based disinfection device includes a sensor for sensing the presence of a person; The sensor is configured to generate the control signal when sensing the presence of the person, and communicate the control signal to the controller.
14. The disinfection lighting device according to any one of the preceding claims 11 to 13, wherein the controller is configured to control the at least one second solid-state light source to provide the violet light with a pulse intensity profile having a pulse frequency between 0.05 Hz and 20 Hz.
15. The disinfecting lighting device according to any one of the preceding claims, wherein the disinfecting lighting device is a spotlight, an LED panel or an LED bulb.