Abstract: UV-curable Fresnel lens resin compositions ?a! comprising a (meth)acrylate containing hydroxyl group and aromatic ring (A1), a urethane group-contining (meth) acrylate (A2) comprising an aromatic diol, an aromatic ringcontaining monofunctional (meth)acrylate (A3), and a photopolymerization initiator (B) and ?1b! comprising (A1), a mono- or di(meth)acrylate monomer (A4), and (B), further supplemented with a polyester (C1) comprising an aromatic diol and a phosphate (C2) for the formation of a Fresnel lens on a sheet or plate made of a methyl methacrylate (co) polymer; a Fresnel lens formed by UV cure of composition ?1a! or ?1b!; and a rear projection screen including a sheet or plate carrying said Fresnel lens. The Fresnel lens has high refractive index, antistatic properties and is satisfactory in adhesion-to a sheet or plate.

Abstract: A motion sensor has a pyroelectric detector, a Fresnel lens array, a reducing lens, and a housing. The detector has two elements located side-by-side and the lens array has a plurality of lenslets which are integrally formed. The reducing lens demagnifies the elements. The reducing lens has grooves which run in parallel directions and face toward the elements. The lens array illuminates the detector by focusing infrared light through the reducing lens and onto the elements. The reducing lens makes the elements appear smaller and closer together. The reduced image of the detector allows the lenslets to be spaced more closely than prior art lenslets, thereby making the angular separation less than the angular separation of prior art sensors. Alternatively, the detector housing may be made smaller while maintaining the same angular separation of prior art sensors. If an object moves between two zones, the sensor detects the movement and triggers an alarm, turns on a light, or initiates some other process.

Abstract: A lenticular lens sheet includes a substrate layer, a lens portion having a lenticular lens configuration which is shaped so as to be convex on a light incident face side of the substrate layer and an achromatic or chromatic colored layer formed adjacent to at least a light incident face of the lens portion. The substrate layer is not colored. Alternatively, it is colored thinner than the colored layer. With the arrangement, it is possible to restrict reflection of outside light and enhance the contrast of picture without reducing the intensity of image light so much. Further, it is possible to realize fine pitching of images.

Abstract: A rear projection type display system with a transmissive screen. A transparent reinforcing plate is coupled to a lenticular sheet of the screen on the light output side by a connective member to broaden the horizontal diverging angle by 60 degrees or more to the right and left sides. The duty factor of a black stripe formed on the lenticular sheet is set to 60% or more so improve the contrast of an image. The diverging angle at each point of a vertically-diffusing lens for diverging light in the vertical direction is modulated in accordance with the height of each point to offer a proper visual angle range in the vertical direction.

Abstract: Various forms of light-diffusing screen are disclosed comprising plastics sheets having surface texturing of some kind, adding to or modifying the diffusing effect. The plastics sheets may have bulk diffusing characteristics in addition to the surface texturing. The surface texturing may be produced by, for example, embossing or by molding the plastics against a textured surface such as a "brushed" surface or a ribbed or grooved surface imparting asymmetrical diffusion characteristics to the screen.

Abstract: A light transmission screen having strong mechanical strength, enhanced image resolution, extremely narrow joints between screens and the like, consisting of a light transmissive panel, a lenticular lens sheet stacked on the light incident side of the light transmissive panel, a Fresnel lens sheet stacked on the light incident side of the lenticular lens sheet and optionally a light transmissive film stacked on the light incident side of the Fresnel lens sheet. The periphery of the light transmissive film or the periphery of the Fresnel lens sheet is joined to the light transmissive panel, resulting in the light transmissive panel, lenticular lens sheet, Fresnel lens sheet and light transmissive film being formed into a single-piece construction.

Abstract: A projection-type display device includes an image projector and a screen, in which image projector is for projecting image light rays and the screen is disposed on a side to which the image light rays are projected from the image projector. The screen is formed of a Fresnel lens sheet with one side thereof facing the image projector and a lenticular sheet disposed on the other side of the Fresnel lens sheet for transmitting the image light rays that are formed into a picture on the screen. The Fresnel lens sheet has a fixed focal length in a region from the center of the Fresnel lens sheet to a prescribed distance and focal lengths gradually decreasing toward the outer periphery of the Fresnel lens sheet in a region exceeding the prescribed distance.

Abstract: Disclosed is a rear projection screen having improved contrast and brightness. A screen for receiving an incident projection beam from a projection lens from a rear side of the screen and for transmitting the received light toward an observer is comprised. A fresnel lens for collimating the projection beam is included. The fresnel lens is formed on one side of the screen, where the projection beam from the projection lens is incident. A light absorbing layer for absorbing an external light incident into the screen and for reflecting a light incident from the fresnel lens is comprised. Also comprised is a light dispersing layer for dispersing the projection beam incident from a rear side of the screen and the reflected light from the light absorbing layer. The light absorbing layer and the light dispersing layer are formed on an observer's side of the screen. The screen has a one sheet structure having a novel light dispersing system.

Abstract: A display device including liquid crystal display panels, arrays of convergently transmissive elements for forming an erect and real image, and fresnel lenses for magnifying the image. The configured surface of the fresnel lens is arranged on the light incident side. The configured surface includes periodic ridges with flat crests and inclined surfaces. Shading layers are provided on the flat crests to eliminate ghosts.

Abstract: A rear-projection screen having at least a Fresnel lens and a light-diffusing member, and is characterized by having vertical-direction light diffusion properties greater at its upper and lower end portions than at its middle portion. For example, the light-diffusing member contains light-diffusing fine particles and has a vertical lenticular lens that diffuses light in the vertical direction, provided on the light-incident surface of the Fresnel lens. This decreases the rainbows caused by misdirected light and also improves the brightness at the border, without causing a lowering of peak gain.

Abstract: A transmission type projection screen is provided with a transparent film attached adhesively to only opaque or shading parts formed on top surfaces of ridges provided on the front surface of a lens sheet. The lens sheet is provided on its rear surface with a plurality of lenses for condensing light projected by a light source. The shading parts do not receive the light condensed by the plurality of lenses. The film protects the front surface of the lens sheet of the screen, and prevents scattering of the lens sheet in fragments when the lens sheet is cracked.

Abstract: A projection type display apparatus incorporating a light receiver or a light transmitter, in which the light signal is received or transmitted through a screen or condensing lens disposed in its vicinity, and hence the luminous flux utility efficiency is high.A projection type display apparatus capable of preventing deterioration of picture quality due to difference in color in the projection units, and the best picture quality is realized even when the projection lenses for different colors are composed of nearly same components.

Abstract: The present invention provides a bright light transmission screen and light diffusion panel. Am amtireflective film is disposed on the surface of a lenticular lens sheet substrate included in a light transmission screen. The antireflective film is made from a high polymer compound of a low refractory index and has a thickness that is different from .lambda./(4n). The antireflective film may also be disposed on a Fresnel lens sheet substrate or a light diffusion panel substrate.

Abstract: Respective unit displays forming a multiscreen display are divided into two halves of a front half cabinet containing a screen part and a rear half cabinet containing a light box part. In using, the rear half cabinet is fixed in a predetermined position in the front half cabinet. In conveying and storing, the rear half cabinet can be contained in the front half cabnet. Further, in fitting the screen, the screen is fixed as pressed against the fitting frame by using wires or the Fresnel lenses forming the screen are fitted to the fitting frames for the respective projecting units.

Abstract: The present invention provides a screen assembly wherein measures are taken to prevent slack produced in a lenticular lens sheet due to temperature changes and gaps created between a Fresnel lens sheet and the lenticular lens sheet due to temperature changes, thereby enabling the display of images free of inconsistencies in color. The structure of the screen assembly has the lower parts of a lenticular lens sheet and a Fresnel lens sheet comprising a screen fixed together, the upper part of the light radiant side of the lenticular lens sheet fixed to the upper part of a framework, the lower part of the screen, where the Fresnel lens sheet and the lenticular lens sheet are put together not being fixed to the lower part of the framework and a specified clearance created between the lower part of the screen and the lower part of the framework.

Abstract: A method for mass-producing eccentric Fresnel lens sheets comprising the steps of: preparing a number of concentric Fresnel lens sheets; dividing the concentric Fresnel lens sheets into a first set and a second set each including a plurality of Fresnel lens sheets; cutting out a plurality of first sheets each corresponding to one portion of the eccentric Fresnel lens sheet from each of the Fresnel lens sheets of the first set; cutting out a plurality of second sheets each corresponding to the other portion of the eccentric Fresnel lens sheet from each of the Fresnel lens sheets of the second set; and bonding each of the first sheets and each of the second sheets in such a manner that patterns on the first sheet and the second sheet are continuous to prepare a plurality of eccentric Fresnel lens sheet. The second set can include a third set and a fourth set and a plurality of third sheets are cut out from the third set and a plurality of fourth sheets are cut out from the fourth set.

Abstract: An image projection apparatus of a rear projection type according to the present invention includes: a display portion having three image sources respectively displaying red, green, and blue images; a screen portion on which the red, green, and blue images are projected; and a projection member positioned between the display portion and the screen portion. The screen portion includes an optical member converting a plurality of light beams output from the display portion into a plurality of substantially collimated light beams, and a rear face and a front face provided at a predetermined interval. The rear face is positioned between the front face and the optical member, the rear face and the front face respectively having an array of cylindrical lenses, the optical axial plane of each cylindrical lens on the front screen face substantially coinciding with the optical axial plane of a corresponding cylindrical lens on the rear screen face.

Abstract: A rear-projection image display device comprising a light source, a display element for visual images, a projection lens and a screen for viewing visual images projected on the screen from the rear, wherein the ratio d/a between the diameter d of the exit pupil of the projection lens and the projection distance a is 0.06 or less, said screen whereon visual images are displayed includes at least two diffusion elements, and light-diffusing fine particles are dispersed in one of the two diffusion elements which is closest to the viewer.

Abstract: A lenticular lens provided on the viewer side of a transmission type screen is composed of at least two layers, that is, a surface layer and a base layer at least one of which contains a light dispersing material, and a visible light absorbing material is mingled in at least one of these two layers, or in the light dispersing material, thereby enhancing the image contrast of the transmission type screen.

Abstract: Respective unit displays forming a multiscreen display are divided into two halves: a front half cabinet containing a screen part, and a rear half cabinet containing a light box part. During use, rear half cabinet is fixed in a predetermined position relative to the front half cabinet. During shipping and storing, the rear half cabinet can be contained in the front half cabinet. Further, in fitting the screen, the screen is fixed as it is pressed against the fitting frame using wires, or the Fresnel lenses forming the screen are fitted to the fitting frames for the respective projecting units.

Abstract: A longitudinal-stripe lenticular lens screen and a transverse-stripe lenticular lens screen are superposed, and a light diffusing agent is mixed only in the longitudinal-stripe lenticular lens screen. Therefore, the light transmittance is high although the angle of view can be three-dimensionally widened by the two lenticular lens screens. In addition, since scan lines of an image are blurred by two diffusion planes, Moire becomes inconspicuous.

Abstract: A rear projection type display system with a transmissive screen. A transparent reinforcing plate is coupled to a lenticular sheet of the screen on the light output side by a connective member to broaden the horizontal diverging angle by 60 degrees or more to the right and left sides. The duty factor of a black stripe formed on the lenticular sheet is set to 60% or more so improve the contrast of an image. The diverging angle at each point of a vertically-diffusing lens for diverging light in the vertical direction is modulated in accordance with the height of each point to offer a proper visual angle range in the vertical direction.

Abstract: A screen fixing structure comprises a screen, a frame, an edge side rectangular frame fixed at the edge part of the screen, a holder holding the edge side rectangular frame, holding brackets having an elongated hole, and bushes and screws inserted into the elongated holes and pressing the holding brackets to the frame side. The holding brackets are fixed with the bushes so as to be able to slide freely. Thereby, the screen is fixed so as to expand and contract freely without the movement of the joints of the screen.

Abstract: A projection display apparatus comprises a compact CRT, a projecting lens for projecting an enlarged image of the CRT, a Fresnel lens having a converging effect, a lenticular sheet as a diffusing plate. An image that has been enlarged by the projecting lens and passed through the lenticular Fresnel lens is formed on the lenticular sheet. The apparatus further comprises a displacing mechanism for displacing the Fresnel lens, and a display mechanism for displaying information related to the direction and extent of displacement of the Fresnel lens displaced by the displacing mechanism.

Abstract: A permeable screen possesses superior brightness, high contrast, wide view angle, excellent contrast to external light, superior clearness, and less reflection of external light image. The permeable screen includes a front dispersing panel and a lenticular lens sheet disposed at the incident side of the front dispersing panel and forming plural lens surfaces. The permeable screen also includes a Fresnel lens sheet disposed at the incident side of the lenticular lens sheet and forming plural lens surfaces. The front dispersing panel functions as a screen and also provides mechanical strength. The front dispersing panel also possesses parts for mounting and fixing the lenticular lens sheet and Fresnel lens sheet.

Abstract: A method and apparatus for projecting multiple patches of full spectrum, rainbow colors to multiple, widely distributed locations is provided. The invention enables the display of such patches on a surface area toward which a source of light is directed, for example the walls and ceiling of a room from sunlight entering the room through a window in the room. The method and apparatus provide first for the refraction of the light from the source of light, and secondly for both the refraction and the reflection of the initially refracted light. The initially refracted light is projected onto a surface of the room as main multiple spectral patches; and the refracted-refracted light, and the reflected-refracted light are projected onto other surfaces of the room laterally of the main patches as additional spectral patches, creating in all, multiple spectral displays of full spectrum, rainbow colors nearly surrounding a viewer and changing in position and shapes with the movement of the sun or other light source.

Abstract: An optical assembly device (10) for use in front of a television screen having a diagonal dimension of S, which optical assembly comprises four panels (12 to 15) connected together to form a hollow body (11) having a substantially rectangular open front side (16) of width W and the height H and a substantially rectangular open rear side (17) of width W' and height H', the separation between the front and rear sides (16 and 17) being D and the inner sides of the panels being reflective. The optical assembly (10) further comprises front and rear lenses (18 and 19) provided extending across the open front and rear sides (16 and 17), respectively, of the body (11), the front side of the rear lens (19) being reflective, wherein the dimensions are related according to the following formulae:(1) W=[1+(W'/H'-B)].multidot.W'(2) H=[1+(W'/H'-B)].multidot.H'(3) D=K.multidot.SWhere:(i) B=(.sqroot.5-1)/2(ii) 0.1<K<0.2.

Abstract: In a projection screen for a rear projection type television set, three lens sheets are arranged in the order of a lenticular lens sheet, a linear Fresnel lens sheet, and a circular Fresnel lens sheet when seen from a viewer's side toward a projector tube. As compared with the arrangement in which the linear and circular Fresnel lens sheets are exchanged with each other, it is possible to obtain a higher brightness and a more uniform brightness, and color uniformity in the picture plane. Further, when the light incident surface of the linear Fresnel lens sheet is matted, it is possible to eliminate white bands (seen from the viewer's side) effectively.

Abstract: A rear-projection screen for a rear-projection image display comprises a Fresnel lens sheet (2) and a lenticular lens sheet (3), or a Fresnel lens sheet (2), a lenticular lens sheet (3) and a light absorbing sheet (4). The entrance surface (21) of the Fresnel lens sheet (2) or the entrance surface (41) of the light absorbing sheet (4) is formed by contiguously and vertically arranging a plurality of horizontally elongate lenticular lenses. The thickness of the Fresnel lens sheet (2) is approximately equal to that of the lenticular lens sheet (3). The entrance surface (31) and the exit surface (32) of the lenticular lens sheet (3) are formed by contiguously and horizontally arranging a plurality of vertically elongate lenticular lenses. Particles of a light diffusing material, which is essential to the prior art rear-projection screen, are not necessarily dispersed in the base sheet (30) of the lenticular lens sheet (3).

Abstract: A rear-projection screen for a rear-projection image display apparatus comprises a Fresnel lens sheet, a first lenticular lens sheet, and a second lenticular lens sheet or a Fresnel lens sheet, first and second lenticular lens sheets and a light absorbing sheet. A light entrance surface of the first lenticular lens sheet or a light exit surface thereof, or both of these surfaces are formed by contiguously and vertically arranging a plurality of horizontally elongate lenticular lenses. A thickness of the first lenticular lens sheet is selected to be the thinner than thicknesses of the Fresnel lens sheet, the second lenticular lens sheet, and the light absorbing sheet. The entrance surface and the exit surface of the second lenticular lens sheet are formed by contiguously and horizontally arranging a plurality of vertically elongate lenticular lenses. Particles of a light diffusing material are not necessarily dispersed in the base sheet of the second lenticular lens sheet.

Abstract: A projection screen comprises a horizontal refracting linear Fresnel lens sheet, a vertical refracting linear Fresnel lens sheet and a light diffusing lenticular lens sheet, which are arranged from the beam-projection side starting with the horizontal refracting linear Fresnel lens sheet followed by the vertical refracting linear Fresnel lens sheet and ending with the light diffusing lenticular lens sheet.

Abstract: A multi-screen projector having unit module projectors stacked at two higher and lower stages, each unit module projector having a screen with a Fresnel sheet unit, a prism sheet unit, and a lenticular sheet unit. By the functions of the Fresnel sheet unit and the prism sheet unit, main output light from higher and lower screens is converged to substantially the same target point. Only one type of metal molds is required for the Fresnel sheet unit as well as the prism sheet unit, thereby reducing the manufacturing cost of the multi-screen projector.

Abstract: In a rear-projection screen comprising a Fresnel lens and a light-diffusing member containing light-diffusing fine particles, it is intended to decrease the moire and to give no dark feeling at the border even when projection systems are set in a short projection distance. For this end, in the rear-projection screen of the present invention, the thickness of the light-diffusing member is made larger at the border than at the center of the rear-projection screen, or the concentration of the light-diffusing fine particles contained in the light-diffusing member is made larger at the border than at the center so that the rear-projection screen can have light diffusion properties greater at its border than at its center. Here, any of a flat plate, a flat sheet and a lenticular lens sheet can be used as the light-diffusing member.

Abstract: A lenticular lens provided on the viewer side of a transmission type screen is composed of at least two layers, that is, a surface layer and a base layer at least one of which contains a light dispersing material, and a visible light absorbing material is mingled in at least one of these two layers, or in the light dispersing material, thereby enhancing the image contrast of the transmission type screen.

Abstract: A wide angle lenticular lens system for a single piece rear projection screen including a plurality of substantially identical parallel and vertical lenticular lenses. Each of the plurality of lenticular lenses is substantially a single element lens and the shape of each of the plurality of lenticular lenses is substantially defined by a hyperbolic function.

Abstract: A transmission screen includes a screen material having a projection light incident surface on which a Fresnel lens is formed, and a projection light outside surface on which a lenticular lens is formed. The lenticular lens has a plurality of lenticular lens portions. Formed between adjacent pairs of the lenticular lens portions are black stripes. Images of the projection light are seen on an outer surface of the lenticular lens. Furthermore, a coating having a low refraction index and a predetermined thickness is formed only on the black stripes.

Abstract: A rear projector for projecting an image onto a display screen mounted on a frame. The frame includes first and second pairs of oppositely disposed mounting members having surfaces adapted to contact the screen. Each mounting member of the first pair is formed of first and second inwardly angled portions which meet at a juncture in a middle region of the member. The screen is coupled to the surfaces of the first and second pairs of mounting members to form an inward curvature of the screen.

Abstract: A rear projection screen unit in a large-size picture display system, composed by combining a plurality of rear projection screen panels arranged in a lattice square with at least one ordinate and abscissa beams disposed between the adjacent screen panels, wherein each of said screen panels intersects with each of said beams which themselves intersect with each other to form the lattice square, and each of said screen panels and ordinate and abscissa beams are connected together by a multiple mortise-and-tenon joint. The lattice square is installed in a outer frame and stressed in the four directions by a resilient members provided on the outer frame. The disclosed structure has minimized the width of the non-effective area in the screen unit, and realized a high reliability in installing strength of the respective screen panels in an integral body suitable for the large-size picture display system.

Abstract: A rear-projection screen for a rear-projection image display comprising a Fresnel lens sheet (2) and a lenticular lens sheet (3), or a Fresnel lens sheet (2), a lenticular lens sheet (3) and a light absorbing sheet (4). The entrance surface (21) of the Fresnel lens sheet (2) or the entrance surface (41) of the light absorbing sheet (4) is formed by contiguously and vertically arranging a plurality of horizontally elongate lenticular lenses. The thickness of the Fresnel lens sheet (2) is approximately equal to that of the lenticular lens sheet (3). The entrance surface (31) and the exit surface (32) of the lenticular lens sheet (3) are formed by contiguously and horizontally arranging a plurality of vertically elongate lenticular lenses. Particles of a light diffusing material, which is essential to the prior art rear-projection screen, are not necessarily dispersed in the base sheet (30) of the lenticular lens sheet (3).

Abstract: A screen is constituted by one sheet of Fresnel lens and two sheets of lenticular lenses, and the following relationships are fulfilled: 0.9 To<vy.multidot.dy/n and 0.9 To<vx.multidot.dy<3 To where vx and vy denote respectively angles, which are obtained when viewing a projection lens from the side of the lenticular lenses through the Fresnel sheet, dx and dy denote respectively distances between a surface of the Fresnel lens and focal planes of the lenticular lenses, n denotes a refractive index of a medium, and To denotes a pitch of the Fresnel lens, whereby radial two dimensional moire disturbance appearing in a rear projection display can be reduced to one-fifth the amplitude of the prior art one.

Abstract: A projection television set includes a body composed of at least two divided upper and lower units, a screen assembly having an integrally formed screen corresponding to the body, and a plurality of bolt and nut assemblies for coupling the divided units together. Each of the upper and lower units has a projector for emitting light rays for forming an image on a screen and a reflector for reflecting the light rays from the projector onto the screen. The projector of the lower unit is arranged below the reflector of the lower unit, and the projector of the upper unit is arranged in an intermediate position between the reflector of the upper unit and the reflector of the lower unit so that setting angles of the two reflectors are different from each other. A screen assembly is mounted on a front face of the body.

Abstract: This invention relates to a three-dimensional image display device comprising two or more parallel elements, each element being formed from a transparent material, each element having a coating formed thereon, the coating including means for reflecting a portion of a beam of light having a selected predetermined orientation of a chosen component of electric field vectors and means for passing the remaining portion of the beam of light. The coating may also include an absorbing means including a dielectric absorbing means for a photo responsive means including a dielectric sensitive means.

Abstract: A projection television has a rear projection screen including a Fresnel lens and a lenticular lens, and a smoke sheet. The screen is characterized in that a dye or a pigment is mixed into the lenticular lens sheet or the smoke sheet which thereby has a waveform selection transmittance having the following transmittance values:.gtoreq.65% when incident light wavelength is <490 nm..ltoreq.60% when incident light wavelength is 490 nm-660 nm.wherein the transmittance, for incident light wavelength 490 nm-580 nm., is substantially different from the transmittance when the wavelength is 580 nm.-660 nm.

Abstract: An optical element such as a rear projection screen for an image display device comprises at least two substantially rigid sheet members each having a first major surface and a second major surface providing a plane of incidence and a plane of emergence, respectively, through which light is transmitted sequentially. A first sheet member comprises a Fresnel lens, and a second sheet member comprises a lenticular lens array on each of the major surfaces thereof. The plane of emergence on the second major surface of the first sheet member includes the Fresnel lens formed of a radiation curable material. A method of making the Fresnel lens is described.

Abstract: A large-size screen display apparatus, having a plurality of projection display devices arrayed in a matrix arrangement to form one large screen, is for displaying characters and the like. A screen of each projection display device consists of a transparent plate disposed on the light entrance side and a diffusing surface disposed on the viewing side. Further, and the periphery of the transparent plate is mounted to a housing of the display apparatus. Light rays emanated from a projection lens are reflected by the transparent plate, whereby an optical image is formed on the entire diffusing screen. Since the optical image is displayed on the entire surface of the diffusing screen, no non-display areas will appear on the screen even when the plurality of projection display device are arranged in the matrix array.

Abstract: A display apparatus comprises a projecting device for projecting an image, with the projecting device having a projection optical system having a limited pupil diameter and screen device arranged at a position where an image is substantially projected by the projecting device. The screen device has at least two sheets in each of which a number of prisms extending like a straight line or a curve are formed on the surface on the side opposite to the projecting device.

Abstract: It is an object of the invention to provide a large-screen projection type display capable of reducing the moire interference due to the periodical structure of the linear Fresnel lenses and lenticular lenses. Since the moire interference is attributed to the shades S generated from the Fresnel sheet 1, these shades are diverged at a divergence angle .epsilon. by the action of the small-pitch lenticular lenses 4, so that the shades can be eliminated on the light-incident side surface of the lenticular sheet 3 which is located at a distance D from behind the Fresnel sheet.

Abstract: There is provided the construction of a multiprojection apparatus composed of a plurality of projection units arranged in the vertical and horizontal directions, in which a transparent holding strip having an H-shaped cross section is inserted between screens each composed of a lenticular sheet and a Fresnel lens, and the right and left ends of a multiscreen are supported by elastic support members, or in which a receive member for receiving the screen in the direction of the optical axis and a screen holding device are provided, the receive member has such a shape as not to block projection light corresponding to an image on the screen and is located near a joint of the screen and another screen, and the holding device is disposed on a black stripe of the lenticular sheet and always pulled by an elastic member toward the receive member. Therefore, according to the present invention, it is possible to restrict the missing of information due to joints of the screens.

Abstract: An image display apparatus comprises an image projection system having a projecting optical system, and a screen for displaying an image by receiving the image light deflected by a mirror system. The screen has a plurality of sheets one of which contains a group of cylindrical lenses which act as light transmitting areas and light blocking areas arranged on an image light exit plane along the direction of arrangement of the cylindrical lenses. The screen arrangement is capable of blocking undesirable reflected light.

Abstract: A rear projection television set in which a lenticular sheet is superposed to a Fresnel lens to form a light transmissive screen, at least one projection cathode ray tube projects an image onto the Fresnel lens so that the image through the lenticular is viewed by a viewer. A projector lens is mounted to the projection cathode ray tube and has an exit pupil so as to project the image from the projection tube onto the Fresnel lens. The image through the lenticular sheet is viewed at a distance from the lenticular lens, wherein there is a relation a.times.b<5.5 where a is distance between the exit pupil of the projector lens 2 and the Fresnel lens 1, and b is a condensing distance for a maximum radius equal to the vertical dimension of the screen.