WO2017145037A1 - Video projector for projecting images, and video projection system for projecting images - Google Patents

Video projector for projecting images, and video projection system for projecting images Download PDF

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Publication number
WO2017145037A1
WO2017145037A1 PCT/IB2017/050948 IB2017050948W WO2017145037A1 WO 2017145037 A1 WO2017145037 A1 WO 2017145037A1 IB 2017050948 W IB2017050948 W IB 2017050948W WO 2017145037 A1 WO2017145037 A1 WO 2017145037A1
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WO
WIPO (PCT)
Prior art keywords
video
projection system
video projector
sheet
projector
Prior art date
Application number
PCT/IB2017/050948
Other languages
French (fr)
Inventor
Maurizio Cini
Domenico Toffoli
Original Assignee
Sim2 Bv International S.R.L.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from ITUA2016A002139A external-priority patent/ITUA20162139A1/en
Application filed by Sim2 Bv International S.R.L. filed Critical Sim2 Bv International S.R.L.
Publication of WO2017145037A1 publication Critical patent/WO2017145037A1/en

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/145—Housing details, e.g. position adjustments thereof

Definitions

  • VIDEO PROJECTOR FOR PROJECTING IMAGES
  • VIDEO PROJECTION SYSTEM FOR PROJECTING IMAGES
  • the present invention relates to a video projector for projecting images, in particular to be embedded into pieces of furniture, walls or ceilings.
  • Audio-video systems are becoming increasingly indispensable in people's daily life and are nowadays widespread.
  • video projection systems that in the last century were tools intended for professional use are now becoming, due to technological development and new image processing techniques, products that can be used as an alternative to television sets.
  • Short-throw projectors are known, which can be positioned in the place of a normal television set and allow projecting an image onto an opposite wall, thus replacing the screen of the television set.
  • audio/video devices such as satellite and terrestrial decoders, DVD readers, CD readers, tuners and audio amplifiers are now available as compact units.
  • solutions have been developed wherein the television apparatus is replaced by a "short-throw" video projection apparatus, preferably inserted into a furniture module (drawer or openable compartment), or directly embedded into a wall or the ceiling of a room, arranged within a lift allowing the video projector to be moved outwards from the inside of the furniture module or ceiling, thus making the image visible on the adjacent wall.
  • a "short-throw" video projection apparatus preferably inserted into a furniture module (drawer or openable compartment), or directly embedded into a wall or the ceiling of a room, arranged within a lift allowing the video projector to be moved outwards from the inside of the furniture module or ceiling, thus making the image visible on the adjacent wall.
  • the video projectors currently available cannot be inserted into a piece of furniture/wall/ceiling without solution of continuity with the external surface of the piece of furniture (or wall/ceiling); therefore, they are laid on a shelf of the piece of furniture or, by means of suitable brackets, they are hung to the ceiling, or they are inserted into suitable compartments covered by sheets made of different materials, which have to be removed (e.g. slid) to allow displaying the image.
  • FIG. 1 is a perspective view of a video projector according to the present invention
  • FIG. 2 is a block diagram of a video projection system according to the present invention.
  • a piece of furniture/wall/ceiling which, in the place of a door wing, a compartment or a portion of the surface of the piece of furniture or wall/ceiling, has a transparent sheet (in particular, made of glass) that is crossed with no loss of quality by a light beam generated by a video projector arranged in the back, which can thus project an image.
  • a transparent sheet in particular, made of glass
  • the video projector of the present invention can be built into a piece of furniture or a wall, or it may be simply laid on a shelf of a piece of furniture, thus projecting the image onto a wall behind it, or it may be positioned on the ceiling, thus projecting the image on a wall under it.
  • the video projector of the present invention is covered with a sheet, in particular a glass sheet, secured to and integral with the video projector itself.
  • the video projection system of the present invention is preferably conceived for use mainly as a built-in system, which can be inserted into pieces of furniture, walls or ceilings by using built-in techniques.
  • Said video projection system comprises a video projector for emitting a light beam and a sheet made of transparent material, in particular glass, coupled to the video projector.
  • the video projector and the video projection system according to the present invention comprise, therefore, a covering sheet or glass having a surface sufficiently large to allow the passage of the image to be projected therethrough and capable of:
  • FIG. 1 shows a video projector 1 according to the present invention, which comprises a casing 2 for containing a per se known image projection system and a covering sheet 4 made of transparent material, in particular glass, for sealing said casing 2 and making it perfectly flat on one side.
  • a covering sheet 4 made of transparent material, in particular glass, for sealing said casing 2 and making it perfectly flat on one side.
  • the video projector 1 can be perfectly aligned with a surface of a piece of furniture (or a wall/ceiling) into which it is inserted.
  • the projection system of the video projector 1 is arranged to emit a light beam incident on said covering sheet 4, so that, after the light beam has crossed the latter, a visual image is projected onto an opposite wall.
  • the angle of incidence of said light beam or ray coming from the video projector 1 onto the covering sheet 4 is preferably variable in the range of 22° to 83°.
  • the reflection of a light ray passing through a surface dividing two materials having different refraction indices is defined by the Fresnel equations, and it is known that reflectivity increases rapidly once the Brewster angle has been exceeded.
  • the covering sheet 4 is coated, preferably on both sides (or, alternatively, on just one side), with a multilayer coating, preferably having fourteen (14) layers.
  • the covering sheet 4 is preferably of the type commonly used for car headlamps, which, within a range of angles of incidence of the light beam comprised between 0° and 60°, shows a residual reflectivity lower than 3%, preferably 2%, in the VIS (visible spectrum of light).
  • the video projector 1 is equipped with a WA (Wide Angle) lens, i.e. a short-throw and ultrashort-throw projection lens having a predetermined visual field, e.g. 70°.
  • WA Wide Angle
  • the video projector 1 projects a light beam at a predetermined angle, preferably 47.5°.
  • the total angle of incidence obtained is as defined below: visual field 70°
  • a multilayer coating is applied onto the covering sheet 4, as aforementioned, to widen the angle of incidence.
  • the covering sheet 4 has some blur that depends on the optical path followed by the light beam in the covering sheet 4 itself; therefore, by reducing the thickness of the covering sheet 4, e.g. from 8mm to 6mm, 4mm or 3mm, it is possible to reduce such phenomenon.
  • the covering sheet 4 allows:
  • the covering sheet 4 is sealed together with the casing 2, so as to make the latter resistant to water and dust-tight, thus allowing the video projector 1 to be installed in dusty or damp environments.
  • the video projector 1 is adapted for use both as a stand-alone device, e.g. to be laid on a piece of furniture, and as a built-in video projector, which can be inserted into pieces of furniture, walls or ceilings by using embedding techniques.
  • the video projector 1 may also comprise one or more of the following elements (not shown in the annexed drawings):
  • At least one video and/or audio device connected to the video projector 1, in particular via at least one connection implemented by using different technologies, such as cable, optical fiber, wi-fi or any other suitable technology;
  • an adjustment and alignment system in particular a manual, mechanical or electronic one.
  • Figure 2 shows a block diagram of a variant of the present invention. Said block diagram schematically shows a video projection system 10 for projecting images according to the present invention.
  • Said video projection system 10 comprises a video projector 11, in particular of the short- throw or ultrashort-throw type, equipped with an image projection system arranged to emit a light beam.
  • the video projection system 10 comprises a sheet 14 made of transparent material, in particular glass, coupled to the video projector 11, said sheet 14 being coated, on at least one side, with a plurality of optical layers, so that, when said light beam hits said sheet 14 within a predetermined range of angles of incidence, the sheet 14 shows a residual reflectivity lower than 3% of the visible spectrum of light (VIS).
  • the image projection system of the video projector 11 is of a per se known type and is adapted to direct light towards said sheet 14 in such a way that, after the light has crossed the sheet, a visual image is projected onto an opposite wall.
  • Said range of angles of incidence of the light beam or ray coming from the video projector 1 onto the sheet 14 is preferably variable in the range of 22° to 83°.
  • the sheet 14 is coated, on at least one side (preferably on both sides), with a multilayer coating, preferably having fourteen layers.
  • the sheet 14 is preferably of the type commonly used for car headlamps, which, within a range of angles of incidence of the light beam comprised between 0° and 60°, shows a residual reflectivity lower than 3%, preferably 2%, in the VIS (visible spectrum of light).
  • the video projector 10 is equipped with a WA (Wide Angle) lens, i.e. a short-throw and ultrashort-throw projection lens, having a predetermined visual field, in particular substantially equal to 70°.
  • WA Wide Angle
  • the video projector 10 projects a light beam at a predetermined angle, preferably equal to 47.5°, and when the sheet 14 is coupled to said projector 10 a total angle of incidence is obtained like the one defined in the equation concerning the video projector 1 of Fig. 1.
  • a multilayer coating is applied onto the sheet 14 as aforementioned.
  • the sheet 14 has some blur that depends on the optical path followed by the light beam in the glass 4; in order to reduce such phenomenon, therefore, said sheet 14 has a thickness smaller than or equal to 8mm.
  • the video projection system 10 may comprise at least one video and/or audio device 15 connected to the video projector 11, in particular via at least one connection (designated by letter a in Fig. 2) that can be implemented by means of different technologies, such as cable, optical fiber, wi-fi or any other suitable technology.
  • the video projection system 10 may also comprise a cooling system 16 for dissipating the heat produced by at least one component of the video projection system 10, in particular by the video projector 11 and/or by said at least one audio and/or video device 15.
  • a cooling system 16 for dissipating the heat produced by at least one component of the video projection system 10, in particular by the video projector 11 and/or by said at least one audio and/or video device 15.
  • the video projection system 10 may then comprise an adjustment and alignment system 17 for adjusting and aligning the video projector 11.
  • said adjustment and alignment system 17 may comprise handling means (see the element designated by letter b in Fig. 2) providing adjustment in the three directions of linear motion (x,y,z) and in the three directions of rotation (roll, pitch, yaw - rotation in the horizontal plane) of the video projector 11 ; it should be noted that said handling means b may be associated with a support base (not shown) of the video projector 11 and may be either of the manual type (e.g. implemented as a short-pitch screw-type mechanical device) or of the motorized type (e.g. implemented as electrically-operated motor educers).
  • the manual type e.g. implemented as a short-pitch screw-type mechanical device
  • motorized type e.g. implemented as electrically-operated motor educers
  • the adjustment and alignment system 17 may be provided with a fixing system (not shown) for coupling the video projector 11 to the manual, mechanical or electronic adjustment and alignment system 17.
  • said fixing system may provide adjustment on the aforementioned six axes, e.g. by means of special adjusters (not shown) positioned between the video projector 11 and the piece of furniture into which said video projector 11 is embedded, and providing adjustment of the base of the video projector 11.
  • the video projection system 10 may then comprise or be coupled to power supply means for supplying power to the various components, for example said power supply means 18 comprising a power socket 18 connected to said components via a set of cables (shown schematically in Fig. 2 and designated by the letters c, d, e, f).
  • power supply means 18 comprising a power socket 18 connected to said components via a set of cables (shown schematically in Fig. 2 and designated by the letters c, d, e, f).
  • the video projection system 10 is adapted for use mainly as a built-in system to be inserted into pieces of furniture, walls or ceilings by using embedding techniques, preferably in such a way that the sheet 14 is substantially aligned with a surface of a piece of furniture (or a wall/ceiling) into which it is inserted.

Abstract

Video projector (1) for projecting images, comprising a casing (2) for containing an image projection system arranged to emit a light beam, said video projector (1) comprises a covering sheet (4) made of transparent material, in particular glass, suitable for sealing said casing (2), said covering sheet (4) being coated, on at least one side, with a plurality of optical layers, so that, when said light beam hits said covering sheet (4) within a predetermined range of angles of incidence, the covering sheet (4) shows a residual reflectivity lower than 3% of the visible spectrum of light (VIS), and corresponding video projection system.

Description

VIDEO PROJECTOR FOR PROJECTING IMAGES, AND VIDEO PROJECTION SYSTEM FOR PROJECTING IMAGES
DESCRD7TION
The present invention relates to a video projector for projecting images, in particular to be embedded into pieces of furniture, walls or ceilings.
Audio-video systems are becoming increasingly indispensable in people's daily life and are nowadays widespread. In particular, video projection systems that in the last century were tools intended for professional use are now becoming, due to technological development and new image processing techniques, products that can be used as an alternative to television sets.
This has been possible because of the smaller dimensions of video projectors and of the associated possibility of reducing the distance between the video projector and the surface onto which the image is projected.
However, on account of the constantly increasing size of screens, along with the presence of multiple connection cables and boxes, such video projectors are also becoming bulky and often unaesthetic devices having a heavy impact within a household environment, frequently impairing the beauty of linear or valuable furniture or the value of a stylish home design.
"Short-throw" projectors are known, which can be positioned in the place of a normal television set and allow projecting an image onto an opposite wall, thus replacing the screen of the television set.
Likewise, also other audio/video devices, such as satellite and terrestrial decoders, DVD readers, CD readers, tuners and audio amplifiers are now available as compact units.
In order to solve the environmental aesthetics problem and exploit existing furniture solutions without impairing the quality of the functions of an audio/video device, solutions have been developed wherein the television apparatus is replaced by a "short-throw" video projection apparatus, preferably inserted into a furniture module (drawer or openable compartment), or directly embedded into a wall or the ceiling of a room, arranged within a lift allowing the video projector to be moved outwards from the inside of the furniture module or ceiling, thus making the image visible on the adjacent wall.
The video projectors currently available cannot be inserted into a piece of furniture/wall/ceiling without solution of continuity with the external surface of the piece of furniture (or wall/ceiling); therefore, they are laid on a shelf of the piece of furniture or, by means of suitable brackets, they are hung to the ceiling, or they are inserted into suitable compartments covered by sheets made of different materials, which have to be removed (e.g. slid) to allow displaying the image.
In addition to the above, the video projectors known in the art are often not capable of projecting good quality images because of image distortion phenomena, and this limits their diffusion considerably.
Finally, such video projectors are often quite delicate objects, and cannot therefore be used in humid or dusty environments or, in general, cannot be subjected to hard wear.
It is therefore one object of the present invention to provide an innovative video projector and video projection system overcoming the drawbacks of the prior art and capable of projecting sharp, bright and undistorted images, as well as usable in any operating environment and for any application, and (especially as far as the video projector is concerned) not requiring the use of movable covers or sliding compartments.
This and other objects are achieved through a video projector and a video projection system as defined in the independent claims.
Particular embodiments are set out in dependent claims, the contents of which should be understood to be an integral part of the present description.
Further features and advantages of the invention will become apparent in the light of the following detailed description, provided by way of non-limiting example with reference to the annexed drawings, wherein:
- Figure 1 is a perspective view of a video projector according to the present invention;
- Figure 2 is a block diagram of a video projection system according to the present invention.
In brief, thanks to the video projector and video projection system of the present invention, a piece of furniture/wall/ceiling is obtained which, in the place of a door wing, a compartment or a portion of the surface of the piece of furniture or wall/ceiling, has a transparent sheet (in particular, made of glass) that is crossed with no loss of quality by a light beam generated by a video projector arranged in the back, which can thus project an image.
The video projector of the present invention can be built into a piece of furniture or a wall, or it may be simply laid on a shelf of a piece of furniture, thus projecting the image onto a wall behind it, or it may be positioned on the ceiling, thus projecting the image on a wall under it.
The video projector of the present invention is covered with a sheet, in particular a glass sheet, secured to and integral with the video projector itself.
As far as the video projection system of the present invention is concerned, it is preferably conceived for use mainly as a built-in system, which can be inserted into pieces of furniture, walls or ceilings by using built-in techniques.
Said video projection system comprises a video projector for emitting a light beam and a sheet made of transparent material, in particular glass, coupled to the video projector. The video projector and the video projection system according to the present invention comprise, therefore, a covering sheet or glass having a surface sufficiently large to allow the passage of the image to be projected therethrough and capable of:
- minimizing image distortion;
- minimizing or cancelling the "ghost" effect of images duplicated on the screen, keeping vision quality at an optimum level;
- reducing brightness dispersion where the light goes through the glass and preventing the creation of an image that would impair vision quality.
Figure 1 shows a video projector 1 according to the present invention, which comprises a casing 2 for containing a per se known image projection system and a covering sheet 4 made of transparent material, in particular glass, for sealing said casing 2 and making it perfectly flat on one side. In this manner, on the side of the covering sheet 4 the video projector 1 can be perfectly aligned with a surface of a piece of furniture (or a wall/ceiling) into which it is inserted.
The projection system of the video projector 1 is arranged to emit a light beam incident on said covering sheet 4, so that, after the light beam has crossed the latter, a visual image is projected onto an opposite wall.
The angle of incidence of said light beam or ray coming from the video projector 1 onto the covering sheet 4 is preferably variable in the range of 22° to 83°.
Further applications may provide a larger visual field and an even shorter throw, the light beam being in such cases variable in a range of 12° to 83° relative to the normal to the covering sheet 4.
The reflection of a light ray passing through a surface dividing two materials having different refraction indices is defined by the Fresnel equations, and it is known that reflectivity increases rapidly once the Brewster angle has been exceeded. The covering sheet 4 is coated, preferably on both sides (or, alternatively, on just one side), with a multilayer coating, preferably having fourteen (14) layers.
The covering sheet 4 is preferably of the type commonly used for car headlamps, which, within a range of angles of incidence of the light beam comprised between 0° and 60°, shows a residual reflectivity lower than 3%, preferably 2%, in the VIS (visible spectrum of light).
The video projector 1 is equipped with a WA (Wide Angle) lens, i.e. a short-throw and ultrashort-throw projection lens having a predetermined visual field, e.g. 70°.
The video projector 1 projects a light beam at a predetermined angle, preferably 47.5°. When the covering sheet 4 is placed over said projector 1, the total angle of incidence obtained is as defined below: visual field 70°
Angle of incidence = h inclination = -^— + 47.5° = 82.5
In order to control the reflectivity responsible for the "ghost" effect in the images generated by the video projector 1, a multilayer coating is applied onto the covering sheet 4, as aforementioned, to widen the angle of incidence.
The covering sheet 4 has some blur that depends on the optical path followed by the light beam in the covering sheet 4 itself; therefore, by reducing the thickness of the covering sheet 4, e.g. from 8mm to 6mm, 4mm or 3mm, it is possible to reduce such phenomenon. The covering sheet 4 allows:
- eliminating the phenomenon of double and triple image edges (ghosts) with wide angles of projection;
- preserving more light, because the light is not reflected back (low reflection, high projection efficiency) unevenly, which would result in brightness non-uniformity; - reducing the trailing edge effect (blur).
The covering sheet 4 is sealed together with the casing 2, so as to make the latter resistant to water and dust-tight, thus allowing the video projector 1 to be installed in dusty or damp environments.
The video projector 1 is adapted for use both as a stand-alone device, e.g. to be laid on a piece of furniture, and as a built-in video projector, which can be inserted into pieces of furniture, walls or ceilings by using embedding techniques.
The video projector 1 according to the present invention may also comprise one or more of the following elements (not shown in the annexed drawings):
- at least one video and/or audio device connected to the video projector 1, in particular via at least one connection implemented by using different technologies, such as cable, optical fiber, wi-fi or any other suitable technology;
- a cooling system for dissipating the heat produced by the video projector 1 ;
- an adjustment and alignment system, in particular a manual, mechanical or electronic one.
Figure 2 shows a block diagram of a variant of the present invention. Said block diagram schematically shows a video projection system 10 for projecting images according to the present invention.
Said video projection system 10 comprises a video projector 11, in particular of the short- throw or ultrashort-throw type, equipped with an image projection system arranged to emit a light beam.
In accordance with the present invention, the video projection system 10 comprises a sheet 14 made of transparent material, in particular glass, coupled to the video projector 11, said sheet 14 being coated, on at least one side, with a plurality of optical layers, so that, when said light beam hits said sheet 14 within a predetermined range of angles of incidence, the sheet 14 shows a residual reflectivity lower than 3% of the visible spectrum of light (VIS). In substance, the image projection system of the video projector 11 is of a per se known type and is adapted to direct light towards said sheet 14 in such a way that, after the light has crossed the sheet, a visual image is projected onto an opposite wall.
Said range of angles of incidence of the light beam or ray coming from the video projector 1 onto the sheet 14 is preferably variable in the range of 22° to 83°.
Further applications may provide a larger visual field and an even shorter throw, the light beam or ray being in such cases variable in a range of 12° to 83° relative to the normal to the sheet 14.
The sheet 14 is coated, on at least one side (preferably on both sides), with a multilayer coating, preferably having fourteen layers.
Also the sheet 14 is preferably of the type commonly used for car headlamps, which, within a range of angles of incidence of the light beam comprised between 0° and 60°, shows a residual reflectivity lower than 3%, preferably 2%, in the VIS (visible spectrum of light). Also in the case shown in Fig. 2, the video projector 10 is equipped with a WA (Wide Angle) lens, i.e. a short-throw and ultrashort-throw projection lens, having a predetermined visual field, in particular substantially equal to 70°. Furthermore, also the video projector 10 projects a light beam at a predetermined angle, preferably equal to 47.5°, and when the sheet 14 is coupled to said projector 10 a total angle of incidence is obtained like the one defined in the equation concerning the video projector 1 of Fig. 1.
In order to obtain a wide angle of incidence and control the reflectivity responsible for the "ghost" effect in the images generated by the video projector 10, a multilayer coating is applied onto the sheet 14 as aforementioned.
The sheet 14 has some blur that depends on the optical path followed by the light beam in the glass 4; in order to reduce such phenomenon, therefore, said sheet 14 has a thickness smaller than or equal to 8mm.
Therefore, also the sheet 14 allows:
- eliminating the phenomenon of double and triple image edges (ghosts) with wide angles of projection;
- preserving more light, because the light is not reflected back (low reflection, high projection efficiency) unevenly, which would result in brightness non-uniformity;
- reducing the trailing edge effect (blur).
As can be seen in Fig. 2, the video projection system 10 may comprise at least one video and/or audio device 15 connected to the video projector 11, in particular via at least one connection (designated by letter a in Fig. 2) that can be implemented by means of different technologies, such as cable, optical fiber, wi-fi or any other suitable technology.
The video projection system 10 may also comprise a cooling system 16 for dissipating the heat produced by at least one component of the video projection system 10, in particular by the video projector 11 and/or by said at least one audio and/or video device 15.
The video projection system 10 may then comprise an adjustment and alignment system 17 for adjusting and aligning the video projector 11.
In particular, said adjustment and alignment system 17 may comprise handling means (see the element designated by letter b in Fig. 2) providing adjustment in the three directions of linear motion (x,y,z) and in the three directions of rotation (roll, pitch, yaw - rotation in the horizontal plane) of the video projector 11 ; it should be noted that said handling means b may be associated with a support base (not shown) of the video projector 11 and may be either of the manual type (e.g. implemented as a short-pitch screw-type mechanical device) or of the motorized type (e.g. implemented as electrically-operated motor educers).
As an alternative, the adjustment and alignment system 17 may be provided with a fixing system (not shown) for coupling the video projector 11 to the manual, mechanical or electronic adjustment and alignment system 17. In a solution without mechanical or electronic adjustment, said fixing system may provide adjustment on the aforementioned six axes, e.g. by means of special adjusters (not shown) positioned between the video projector 11 and the piece of furniture into which said video projector 11 is embedded, and providing adjustment of the base of the video projector 11.
The video projection system 10 according to the present invention may then comprise or be coupled to power supply means for supplying power to the various components, for example said power supply means 18 comprising a power socket 18 connected to said components via a set of cables (shown schematically in Fig. 2 and designated by the letters c, d, e, f).
The video projection system 10 is adapted for use mainly as a built-in system to be inserted into pieces of furniture, walls or ceilings by using embedding techniques, preferably in such a way that the sheet 14 is substantially aligned with a surface of a piece of furniture (or a wall/ceiling) into which it is inserted.
It is clear that the provisions of the present invention allow obtaining optimal image quality and performance from the video projection system 10 without in the least affecting the style of the furniture in the environment where the video proj ection system 10 of the present invention is to be installed.
Of course, without prejudice to the principle of the invention, the forms of embodiment and the implementation details may be extensively varied from those described and illustrated herein by way of non-limiting example, without however departing from the protection scope of the present invention as set out in the following claims.

Claims

1. Video projector (1) for projecting images, comprising a casing (2) for containing an image projection system arranged to emit a light beam,
characterized in that
said video projector (1) comprises a covering sheet (4) made of transparent material, in particular glass, suitable for sealing said casing (2), said covering sheet (4) being coated, on at least one side, with a plurality of optical layers, so that, when said light beam hits said covering sheet (4) within a predetermined range of angles of incidence, the covering sheet (4) shows a residual reflectivity lower than 3% of the visible spectrum of light (VIS).
2. Video projector (1) according to claim 1, characterized in that said range of angles of incidence is comprised between 12° and 83°.
3. Video projector (1) according to claim 1 or 2, characterized in that said residual reflectivity is equal to 2%.
4. Video projector (1) according to one or more of the preceding claims, characterized in that the covering sheet (4) has a thickness smaller than or equal to 8mm.
5. Video projector (1) according to one or more of the preceding claims, characterized in that the video projector (1) is inserted into an opening of a piece of furniture, wall or ceiling and is sealed so as to be resistant to infiltrations of humidity and water.
6. Video projector (1 ) according to any one of claims 1 to 4, characterized in that said video projector (1) is a stand-alone device.
7. Video projection system (10) for projecting images, comprising a video projector (11), in particular of the short-throw or ultrashort-throw type, equipped with an image projection system arranged to emit a light beam,
characterized in that
said video projection system (10) comprises a sheet (14) made of transparent material, in particular glass, coupled to the video projector (11), said sheet (14) being coated, on at least one side, with a plurality of optical layers, so that, when said light beam hits said sheet (14) within a predetermined range of angles of incidence, the sheet (14) shows a residual reflectivity lower than 3% of the visible spectrum of light (VIS).
8. Video projection system (10) according to claim 7, characterized in that said range of angles of incidence is comprised between 12° and 83° relative to the normal to the sheet
(14).
9. Video projection system (10) according to one or more of claims 7 and 8, characterized in that said residual reflectivity is equal to 2%.
10. Video projection system (10) according to one or more of the preceding claims 7 to 9, characterized in that the sheet (14) has a thickness smaller than or equal to 8mm.
11. Video proj ection system (10) according to one or more of the preceding claims 7 to 10, characterized in that it comprises at least one video and/or audio device (15) connected to the video projector (11).
12. Video projection system (10) according to one or more of the preceding claims 7 to 11, characterized in that it comprises a cooling system (16) for dissipating the heat produced by at least one component of the video projection system (10).
13. Video proj ection system (10) according to one or more of the preceding claims 7 to 11 , characterized in that it comprises an adjustment and alignment system (17) for adjusting and aligning the video projector (11).
14. Video projection system (10) according to claim 13, characterized in that said adjustment and alignment system (17) comprises handling means (b) that provide adjustment in the three directions of linear motion and in the three directions of rotation of the video projector (11).
15. Video projection system (10) according to one or more of the preceding claims 7 to 14, characterized in that it is inserted into an opening of a piece of furniture, wall or ceiling.
PCT/IB2017/050948 2016-02-22 2017-02-20 Video projector for projecting images, and video projection system for projecting images WO2017145037A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
ITUA201656518 2016-02-22
IT202016000016887 2016-02-22
IT102016000032959 2016-03-31
ITUA2016A002139A ITUA20162139A1 (en) 2016-03-31 2016-03-31 VIDEO PROJECTOR FOR IMAGE PROJECTION

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Citations (6)

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US4046437A (en) * 1974-11-19 1977-09-06 Aristide Leon Caron Combination cabinet for audio-visual teaching
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EP2590017A1 (en) * 2011-11-04 2013-05-08 Ricoh Company, Ltd. Image projection apparatus

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