EP2290290A1 - Dispositif de simulation optique d'un feu de cheminée - Google Patents

Dispositif de simulation optique d'un feu de cheminée Download PDF

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Publication number
EP2290290A1
EP2290290A1 EP20090010825 EP09010825A EP2290290A1 EP 2290290 A1 EP2290290 A1 EP 2290290A1 EP 20090010825 EP20090010825 EP 20090010825 EP 09010825 A EP09010825 A EP 09010825A EP 2290290 A1 EP2290290 A1 EP 2290290A1
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EP
European Patent Office
Prior art keywords
projection
flame
image
light sources
projection surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP20090010825
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German (de)
English (en)
Other versions
EP2290290B1 (fr
Inventor
Dieter Achatz
Peter Wickelmaier
Kamil Zawadzski
Daniel Pless
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Truma Geraetetechnik GmbH and Co KG
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Truma Geraetetechnik GmbH and Co KG
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Priority to EP09010825.9A priority Critical patent/EP2290290B1/fr
Publication of EP2290290A1 publication Critical patent/EP2290290A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/002—Stoves
    • F24C7/004—Stoves simulating flames

Definitions

  • the invention relates to a device for optical simulation of a flame or a fire and in particular for simulating a fireplace with optical means.
  • Devices are known in which an as realistic as possible visual representation or simulation of a fireplace, e.g. a chimney fire or the like is achieved. Such simulations are e.g. also in combination with other devices, e.g. with electric or gas-fired heaters, whereby it is important to achieve by interaction with generated heat a realistic as possible illusion of a fireplace.
  • the DE 10 2004 016 156 A1 shows such an example.
  • a rotating profiled roller is backlit to produce in conjunction with one or more light sources as possible flame-like visual impressions and silhouettes on a kind of projection surface.
  • the invention is based on the object to provide a device for the optical simulation of a fireplace, which is able to realize in a particularly simple and reliable manner with comparatively low energy and construction costs, a particularly realistic optical flame representation.
  • An apparatus for optical simulation of a fireplace comprises a projection device and a projection surface, wherein the projection device is adapted to generate an image of a flame or a part of a flame and to project onto the projection surface for optical imaging, and wherein the projection device for image formation imaging device in the manner of a projection mask, for example a slide, through which the image can be generated by exposure.
  • the projection device can have one or more individual projectors, each with an image-generating device for image generation and with a lighting device for illuminating the image-generating device.
  • the illumination device may be formed with a single light source, in particular if a plurality of individual projectors are provided.
  • each individual projector has a plurality of light sources, wherein at most a part of the image can be generated by partial illumination of each of the light sources by their spatial arrangement in the individual projector and / or by their activation and in cooperation with the image generation device.
  • the control of the light sources may relate to the time profile of the light field, the spatial course and / or the intensity distribution.
  • a control device can be provided by which the spatial and / or temporal lighting behavior and the image generation behavior of the individual projectors and in particular of the individual light sources of the individual projectors can be controlled.
  • This control device can have a memory device, by means of which, in particular externally, control data for the spatial and temporal control of the illumination and / or the imaging, ie for the control of the individual projectors and / or the light sources can be stored.
  • the storage device of the control device can be designed as a removable storage medium or have such.
  • a single projector can in each case have a condenser optic or a collimating optic between the illumination device and the image generation device as well as a projection optics between the image generation device and the projection surface.
  • These optics may e.g. each formed by a single suitable lens or a lens system.
  • the illumination device can each have one or more LEDs with a white or color-emitting emission spectrum as the light source. Preference is given to combinations of yellow and white LEDs, because they represent a good compromise of suitable spectral possibilities and financial outlay. In addition, e.g. also red LEDs are provided.
  • the projection surface may be a reflective projection surface or a transmitting projection surface in the manner of a ground-glass screen.
  • the projection surface may be formed with a curved and / or inclined course such that a light intensity of the projection light falling off the projection surface before projection on the projection surface is at least partially compensated for or compensated for after the reflection or transmission at the projection surface, in particular at a distance from the projection device is.
  • the projection surface may have an area which is more curved or inclined than the rest of the area in an upper area. Due to the increased curvature in the upper area, the incident light, although weakened due to the greater distance from the light sources arranged below, is reflected on a smaller area in relation to the lower area, so that a brighter light impression again arises. Overall, this can make the impression of brightness even.
  • a noise generating device may be formed with a loudspeaker device, which are designed to generate and deliver a simulated flame or combustion noise.
  • the noise generating device may comprise a memory device, by which, particularly externally, control data for generating noise can be stored or adjusted.
  • This storage device of the noise generating device can be designed as a removable storage medium or have such.
  • a housing of the device is formed with a bottom area, a lid area, a rear side and a front side, wherein the projection device is arranged in the area of the floor area and wherein either (a) the rear side forms, is or has a reflective projection area and the front side is transparent or (b) the front side forms, is or has a transmissive projection surface.
  • a deep-drawn relief element in the form of a photo-realistic relief image can be formed as wood or glutimitatine in such a way that the projection device is obscured by an observer when viewed through the front side.
  • a reflector can be formed in the cover region of the housing in such a way that scattered light from the projection device arranged at the bottom is reflected back downwards at an acute angle.
  • the light may come from an additional, e.g. arranged in the lower region of the housing, are not reflected as a projection device serving lighting device.
  • the reflected light then radiates e.g. into an area in front of the device, but outside the device, there to e.g. to illuminate the floor in front of the device. This additionally improves the impression of a real fire.
  • It can be formed on a common carrier in the form of a board, a plurality of light sources or all light sources of a single projector or multiple individual projectors or all individual projectors. This makes it possible to achieve a compact design.
  • a single projector may preferably have four light sources arranged in a plane, wherein two of the light sources are arranged side by side on a first line X in a first extension direction in order to produce laterally adjacent lower flame regions during the image formation, and wherein the other two light sources are spatially spaced from each other and from the first two light sources and disposed therebetween and along a second line Y along a second spanwise direction perpendicular to the first spanwise direction to overlap second flame areas superimposed on the first flame areas during imaging produce.
  • This arrangement of four light sources eg four LEDs, a particularly realistic Flammeindruck can be simulated.
  • the projection device can be configured in such a way that the image of the flame or of the flame parts can be projected by the projection device onto the projection surface in such a way that the image edges on the projection surface appear out of focus to the viewer.
  • the light sources of the projection device can be controlled individually in order to be able to change at least the brightness of the light sources.
  • Algorithms for driving the light sources are stored in the control device of the device, wherein the algorithms have or display different schemas. This means, on the one hand, that several sequences of activation (brightness control) of the relevant light source in the form of algorithms can be stored for each individual light source. In addition, various scenarios in the form of combinations of such sequences of different light sources may be stored as algorithms.
  • the algorithms thus act at least in two, preferably in three control planes: First, the algorithms make it possible to change the brightness of each individual light source in a certain way. In the higher level, the light sources of a single projector are controlled by a sequence of different light source controls, so that the individual projector alone can produce the most realistic possible flame image. Finally, several individual projectors are controlled with the aid of algorithms in the level above them, in order to produce different flame images in cooperation with the individual projectors.
  • the algorithms can be selected according to a given rule, according to the random principle and / or according to a weighted random principle.
  • the algorithm contains a predetermined control of the individual projectors and the light sources.
  • the predetermined rule may e.g. but also changed by the operator, e.g. to be able to switch between a roaring fire and a glowing ember.
  • Weighted randomness takes into account that small and large flames do not occur with equal probability in a realistic chimney fire. For this purpose, it is determined in which frequency in a real fire areas appear light and dark. This frequency is then replicated by the weighted random number generator.
  • FIGS. 1A and 1B show in a schematic and sectional side view of two different embodiments of a device 1 according to the invention for simulating a chimney fire.
  • the device 1 consists on the one hand of a housing 50 with a bottom region 50a, an upper region or cover region 50b and a front side 50v and a rear side 50r.
  • a projection device 20 is provided in the region of the bottom region 50a, which is designed to generate an image of a chimney fire and to project it onto a projection surface 30.
  • the projection surface 30 is a reflective or reflective projection surface 31, which is arranged in the region of the rear side or rear wall 50 r of the housing 50. Also, the back or rear wall 50r of the housing 50 itself may form the projection surface 31, for example by providing a certain coating there.
  • the projected image is formed on the projection surface 31 by means of light beams L1 from the projection device 20.
  • the projection light L1 is reflected on the projection surface 31 and, as the light rays L2 of the image light, leaves the case 50 through the front wall 50v, which can be at least partially formed by a transparent window plate 40, for example a disk.
  • the reflected image light L2 then reaches the eye of the observer B, thereby perceiving the chimney fire image projected on the reflective projection surface 31.
  • the embodiment of the FIG. 1B has a similar structure as the embodiment of Figure 1A , wherein, however, as the projection surface 30, a transmissive projection surface 32 in the region of the front or front wall 50v of the housing 50 is used. That is, the primary light or projection light L1 for projecting the chimney fire image reaches the transmissive projection surface 32 and is partly scattered there as an image due to the opacity and over the front wall 50v of the housing 50 with the corresponding transparent wall or viewing window plate 40 leaves the housing 50 and again reaches the eye of the observer B as transmitted light or image light L2, in order to produce there the sensory impression of an image of a chimney fire.
  • the transmissive projection surface 32 may also be formed integrally in the front 50v of the housing 50 and / or in the viewing window 40.
  • FIGS. 2A and 2 B show in schematic and partially sectioned view two different embodiments of the device 1 according to the invention, with particular reference to the principles underlying the generation of the flame images, reference is made.
  • FIGS. 2A and 2 B The embodiments of the FIGS. 2A and 2 B is common that they in their optical paths first a lighting device 21 with one or more light sources 21-1, ..., 21-4, a condenser optics or collimating optics 22, for example consisting of a single condenser lens or collimating lens 22 ', the actual Imaging device 23 and a projection optics 24, for example, from a single projection lens 24 ', have.
  • the condenser optics 22 homogenizes the incident light from the illumination device 21 and leads to a better illumination of the actual image generation device 23.
  • the projection optics 24 then performs the actual imaging and projection onto the projection surface 30 out.
  • a targeted focusing or targeted defocusing of the image to be imaged on the projection surface 30 can be achieved.
  • a blurred image can increase the quality of the simulated flame image.
  • the image generation device 23 In the embodiment of the FIG. 2A it is a projection device 20 operating in transmission.
  • the image generation device 23 generates the image to be displayed in transmission.
  • the primary light from the illumination device After passing through the collimating or condensing optics 22, the primary light from the illumination device falls onto the image generation device 23 and it is the transmitted light which, after leaving the image generation device 23, carries the information of the image, which then emerges on the projection surface 30 after passing through the projection optics 24.
  • the imaging device 23 may simply be a transparency.
  • other microdisplays which also work in transmission are conceivable, for example in the form of a transmissive LCD display, in which case the optionally dashed-line control device 25 becomes necessary for image production.
  • the image-generating device 23 may be a microdisplay operating in reflection, for example a corresponding LCD display device, in which case in turn the optionally represented control device 25 will be necessary for the image production.
  • FIG. 3 shows a schematic and sectional side view of an embodiment of a single projector 20-1, ..., 20-4 of the projection device 20.
  • the single projector 20-1, ..., 20-4 contains the already in the FIGS. 2A and 2 B represented optical elements, namely the illumination device 21, the condenser or collimation optics 20, the image forming device 23 and the projection optics 24th
  • the lighting device 21 is in the embodiment of the FIG. 3 of three individual light sources 21-1, 21-2, 21-3, for example of three LEDs. In fact, however, a single light source can also be provided, but other numbers of individual light sources 21-1,..., 21-4 are also conceivable. The number of light sources 21-1,..., 21-4 and their timing and spatial arrangement and orientation are adjusted according to the requirements of the image formation.
  • the individual projectors 20-1,..., 20-4 of the projection device 20 are each constructed on a board 27, which controls the light sources 21-1,..., 21-4 and corresponding control circuits 27-1, if necessary also carries the control device 25 for image formation. It is also conceivable there to provide a noise generating device 28 with a corresponding speaker 28-1, which are suitable for acoustic support of the simulation of the fireplace.
  • FIG. 4 shows a perspective view from the front of an overview of an embodiment of the inventive device 1 for simulating a fireplace.
  • FIG. 7 FIG. 12 is a schematic and perspective plan view of one embodiment of a single projector 20-1,..., 20-4.
  • FIG. 7 is a partially transparent representation chosen to the single projector - even in comparison with FIG. 3 - be able to explain better.
  • the single projector 20-1, ..., 20-4 off FIG. 7 is again arranged on a substrate in the form of a board 27.
  • the light sources 21-1, 21-2, ... are arranged.
  • the board 27 also carries an additional illumination device 90, which may be used for backlighting or lighting the fire bed 80.
  • FIG. 8 also shows a schematic and perspective plan view of an arrangement for a projection device 20, which consists of four individual projectors 20-1, 20-2, 20-3 and 20-4, each of which in the Figures 3 or 7 may have shown structure.
  • the individual projectors 20-1, ..., 20-4 are each arranged on separate boards 27, but then connected via lines 29 to a common control board 60, which in this case also the sound generating device 28 and its controller and the speaker 28-1 wearing.
  • FIG. 9 shows in a schematic and perspective view the interaction of the different light sources 21-1, 21-2, 21-3 of the illumination device 21 with the image generating device 23, namely the slide, which carries a flame image to 30 in the image on the projection surface 30 different flame components or Flame part images F1, F2 and F3 represent in a corresponding spatial arrangement.
  • the flame sub-images F3, F2, F1 may be generated to emulate an upward-lit flame.
  • FIG. 10 shows in schematic and perspective plan view various embodiments of a lighting device 21 with different numbers and geometric arrangements of a plurality of light sources 21-1, 21-2, ..., which may be formed by LEDs, for example.
  • FIG. 11 shows a schematic plan view of the arrangement of (f) certain lighting device 21 from FIG. 10 ,
  • first and second light sources 21-1 and 21-2 are formed along a first line X and spaced apart from each other.
  • second line Y which is perpendicular to the first line X
  • two further light sources 21-3 and 21-4 are arranged, spatially spaced apart and exactly between the first two light sources 21-1 and 21-2.
  • the first two light sources 21-1 and 21-2 can be used to image a lower and thus wider flame area of a chimney fire, while the other two light sources 21-3 and 21-4 are used above the lower one Flame range arranged single flames or lightening flame areas in the upper area of the fireplace fire map.
  • FIG. 12 shows a schematic and sectional side view of a further development of the device 1 for simulating a chimney fire.
  • a curved surface arranged in the region of the rear wall 50r of the housing 50 serves as a reflection surface 30, 31.
  • a projection device 20 with a single projector 20-1 can be seen in the lower region 50a of the housing 50.
  • the front or front wall 50v of the housing 50 adjoins the transparent window 40, through which the observer can examine the flame image projected onto the projection surface 31.
  • the gluten imitation 80 that is to say the imitation of the fire bed, can be seen, which is illuminated via the additional illumination 90, which also performs a background exposure in connection with the projection surface 31.
  • the glutamate 80 may be formed in particular in the form of a printed with a photo and then deep drawn plastic plate or film to achieve a photorealistic relief image.
  • the projection surface 31 is curved more strongly in the upper region than in the lower region, in which the projection surface 31 can also extend flat. As a result, a homogenization of the brightness impression of the flame image is achieved, which the viewer B perceives from the outside.
  • FIGS. 13A and 13B show how, via a plurality of individual projectors 20-1,..., 20-4, which respectively generate independent flame segments F1,..., F4, an overall image F of a flame can be realized which shows a superposition of the individual flame segments F1, ... represents F4.
  • FIG. 13B shown individual projectors 20-1, ..., 20-4 actually act separately to existing individual projectors, which are then controlled differently in time in a certain way to produce the individual flame segments F1, ... F4 on the projection surface 31, to superimpose and thus depict the overall image F of the flame.
  • a fluid movement sequence is achieved for the flame.
  • FIG. 14 shows in a schematic side view the possibility of even a coherent flame body flame sections F1 ', F2', F3 'represent, so flame tongues, which are spatially separated from the rest of the flame.
  • FIG. 15 shows a possible modular summary of a plurality of individual projectors 20-1, ..., 20-4, wherein provided on a common board 27 four different sets with four light sources 21-1, ..., 21-4 for the lighting devices 21 are, each set so a lighting device 21 for a single projector 20-1, ..., 20-4 realized.
  • a common substrate 23 "or common carrier is shown above it, which carries the imaging devices 23, which are to be provided for the individual projectors 20-1,..., 20-4, in the form of slides.
  • FIG. 16 is in a similar manner a structure for an embodiment of the inventive device 1 for the simulation of a fireplace according to FIG. 12 shown, wherein additionally in the upper portion 50b of the housing 50, a reflector 70 for utilizing stray light or edge light of the projection device 20 is provided, this reflector then serves to illuminate the front space V in front of the device 1 or the Glutimitat 80.
  • the reflector 70 also reflects the light of the additional illumination device 90, which may also be related by LEDs and also serves to illuminate the glutimate 80 backward.
  • an optionally external control unit e.g. a remote control
  • the behavior of the device can be controlled, e.g. in view of the overall brightness, history and speed of the flame sequences, sequence selection and the like. This makes the impression of a calm or influenced fire and a low or high blazing fire selectable. If necessary, the brightness can be adapted to the environment.
  • the acoustic impression can also be adapted to the visual impression and the visual appearance. This is also accessible via the remote control.
  • the remote control can be used to select different control programs for the flame simulation and for the sound module.
  • the simulation unit or device as a whole preferably consists of a plurality of individual projectors or mini-projectors. Furthermore, a control, a sound or noise module, a corresponding memory extension and a corresponding power supply are conceivable.
  • Each of the individual projectors can either represent a total of one flame, possibly of several parts, or even only one flame part. In the latter case, that is, when a single projector only represents one flame part, when using a plurality of projectors, an arrangement can be selected such that, in cooperation with the individual projectors, the individual flame parts can be optically superimposed to form an overall flame.
  • each of the single projectors preferably two light sources, e.g. to provide two LEDs, but preferably three, four or more light sources are formed, e.g. in the form of LEDs. These are controlled in such a way that a corresponding temporal sequence results, which represents a liquid flame image, e.g. in the form of a flame rising in its motion.
  • the imaging device ie in particular the slide
  • only a partial illumination for imaging can be achieved, e.g. also in the sense of ascending the flame.
  • Such a simulated flame movement can therefore be realized with only one projector.
  • a multi-colored flame By using a color slide and a white light source, a multi-colored flame can be displayed. Alternatively, a multi-colored flame may also be obtained by using colored light sources, e.g. colored LEDs are generated. Preferably priced yellow LEDs are used and at least a more expensive white LED. By their interaction, typical flames, e.g. in blue or white color.
  • colored light sources e.g. colored LEDs are generated.
  • Preferably priced yellow LEDs are used and at least a more expensive white LED.
  • Another aspect of a realistic flame simulation can be the targeted defocusing of the projected images or projected partial images. This is done in conjunction with the control of the various light sources, that is, in particular the LEDs and the staggered images generated thereby, wherein the displacement of the images a flame movement or a movement of the flame tongue is suggested. This makes it possible to enable a very realistic flame representation with just one projector.
  • the light intensity can be increased in an upper region, that is to say further away from the projection device.
  • the spatial limit of the flame in the upper region ie at a further distance from the projection device, can be displayed improved.
  • a flame image may e.g. divided into several segments, the various segments can be represented either by the use of multiple light sources and their control in a single projector or by superimposing the projection images of different projectors. Of course, both measures can be combined.
  • the optical superimposition of the different segments then leads again to an overall picture, that is to an overall representation of a flame.
  • the different segments can either be sharply delimited against each other spatially, but also conceivable is a partial overlap of the segments, in terms of both space and time, so that overall a particularly realistic spatial and temporal evolution, ie a flame movement can be suggested.
  • a single projector can therefore also represent individual flame segments, in particular if they have no connection with a main flame shown, so that in this way detached from a main flame flame splashes are visually displayed.
  • At least one further light source e.g. be provided in the form of an LED. This can e.g. also located outside of a designated projector but associated with it, e.g. in the area of the flame root. This additional light source can therefore also be used to illuminate the relief image for the simulated combustion bed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Projection Apparatus (AREA)
EP09010825.9A 2009-08-24 2009-08-24 Dispositif de simulation optique d'un feu de cheminée Active EP2290290B1 (fr)

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GB2502814A (en) * 2012-06-08 2013-12-11 Basic Holdings A fireplace with means for simulating flames by combining images of a fuel bed and flames using an optical element
EP3173689A1 (fr) * 2012-03-07 2017-05-31 Nii Northern International Inc. Dispositif d'éclairage électronique avec flamme factice
US10024507B2 (en) 2012-03-07 2018-07-17 Sterno Home Inc. Electronic luminary device with simulated flame
US10352517B2 (en) 2017-09-07 2019-07-16 Sterno Home Inc. Artificial candle with moveable projection screen position
US10948146B2 (en) 2010-06-28 2021-03-16 L&L Candle Company, Llc Electronic lighting device and method for manufacturing same
US10976020B2 (en) 2008-09-30 2021-04-13 L&L Candle Company, Llc Kinetic flame device
NL2024804B1 (en) * 2020-01-31 2021-09-13 Kal Fire Beheer B V Display device for an artificial fireplace

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AU201712794S (en) 2016-11-23 2017-05-23 Dometic Sweden Ab Ventilation and air conditioning apparatus
US11772452B2 (en) 2017-11-16 2023-10-03 Dometic Sweden Ab Air conditioning apparatus for recreational vehicles
USD905217S1 (en) 2018-09-05 2020-12-15 Dometic Sweden Ab Air conditioning apparatus
IT201900019193A1 (it) 2019-10-17 2021-04-17 Dometic Sweden Ab Apparato di condizionamento dell'aria per veicoli ricreativi

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DE102004016156A1 (de) 2004-04-01 2005-11-03 Truma Gerätetechnik GmbH & Co. KG Vorrichtung zur Simulation eines Kaminfeuers und Heizungsvorrichtung für Reisemobile
EP1684017A2 (fr) 2005-01-21 2006-07-26 Dimplex North America Limited Agencement simulant des flammes
WO2007021187A2 (fr) 2005-08-13 2007-02-22 Vicaroth N.V. Foyer a feu simule

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US10976020B2 (en) 2008-09-30 2021-04-13 L&L Candle Company, Llc Kinetic flame device
US11885467B2 (en) 2008-09-30 2024-01-30 L&L Candle Company, Llc Kinetic flame device
US11105481B2 (en) 2008-09-30 2021-08-31 L&L Candle Company, Llc Kinetic flame device
US10989381B2 (en) 2008-09-30 2021-04-27 L&L Candle Company, Llc Kinetic flame device
US10969074B2 (en) 2010-06-28 2021-04-06 L&L Candle Company, Llc Electronic lighting device and method for manufacturing same
US10948146B2 (en) 2010-06-28 2021-03-16 L&L Candle Company, Llc Electronic lighting device and method for manufacturing same
US11105480B2 (en) 2010-06-28 2021-08-31 L&L Candle Company, Llc Electronic lighting device and method for manufacturing same
US11828426B2 (en) 2010-06-28 2023-11-28 L&L Candle Company, Llc Electronic lighting device and method for manufacturing same
US10024507B2 (en) 2012-03-07 2018-07-17 Sterno Home Inc. Electronic luminary device with simulated flame
EP3173689A1 (fr) * 2012-03-07 2017-05-31 Nii Northern International Inc. Dispositif d'éclairage électronique avec flamme factice
GB2502814A (en) * 2012-06-08 2013-12-11 Basic Holdings A fireplace with means for simulating flames by combining images of a fuel bed and flames using an optical element
US10788179B2 (en) 2017-09-07 2020-09-29 Sterno Home Inc. Artificial candle with moveable projection screen position
US10808899B2 (en) 2017-09-07 2020-10-20 Sterno Home Inc. Artificial candle with moveable projection screen position
US10578264B2 (en) 2017-09-07 2020-03-03 Sterno Home Inc. Artificial candle with moveable projection screen position
US10352517B2 (en) 2017-09-07 2019-07-16 Sterno Home Inc. Artificial candle with moveable projection screen position
NL2024804B1 (en) * 2020-01-31 2021-09-13 Kal Fire Beheer B V Display device for an artificial fireplace
US12025280B2 (en) 2020-01-31 2024-07-02 Kal-Fire Beheer B.V. Artificial fireplace for displaying an artificial fire pattern

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