Abstract: A refracting optical lens 15 is provided to project light from transmitting means onto a convex mirror 16 to correct for pincushion distortion of the convex mirror 16.

Abstract: An image display system includes transmission means 10 provided with a light emitting body 11 for emitting light, a parabolic mirror 12 for reflecting the light emitted out of the light emitting body 11 and for emitting the light as substantially-parallel light, a converging lens 13 for converging the parallel light from the parabolic mirror 12, and a light valve 14 for providing image information to the light converged by the converging lens 13 and for emitting the light, projective optical means 20 provided with a refractive optical lens 21 for projecting the light from the transmission means 10 and a convex mirror 22 for reflecting the light from the refractive optical lens 21 by using a reflecting surface thereof having negative power and for enlarging and projecting the reflected light, and display means 30 for receiving the light from the projective optical means 20 by way of a receiving surface 30A thereof and for displaying an image based on the image information on an image display screen 30B thereof

Abstract: A transmission screen has a refraction total reflection Fresnel lens plate 10C, a stray light eliminating plate 20, and an image display plate 30. The stray light eliminating plate 20 has a condensing lens array 21 and black stripes 23. The array 21 has unit lenses arranged at an incident plane of the transparent substrate 22 in a periodic structure in an up-and down direction. The black stripes 23 has transparent sections 201 placed near condensing light points of the unit lens and opaque sections 200 around the condensing light points of the unit lenses. The sections 201 and 200 are alternately arranged at the outgoing plane of the transmission substrate 22 in a periodic structure in an up-and-down direction. The image display plate has lenticular lenses 31 in which unit lenses are arranged in a periodic structure in a horizontal direction at an incident plane of the transmission substrate 32 of a scattering characteristic capable of scattering light fluxes.

Abstract: An image display device comprises an optical imaging arrangement for providing image information to illumination light and for transmitting the light as an optical image signal; a display for receiving the optical image signal and for displaying an image based on the image information; and a projecting optical arrangement including a reflecting part having a reflecting surface for reflecting the optical image signal, and a refracting optical part having a refracting surface for projecting the optical image signal onto the reflecting part. At least one of the reflecting surface and the refracting surface is aspherical.

Abstract: A refracting optical lens 15 is provided to project light from transmitting means onto a convex mirror 16 to correct for pincushion distortion of the convex mirror 16.

Abstract: In an image display which reproduces a color image by using lights color-separated into four or more colors through color filters, the objects of the invention are to effectively utilize the energy of light from a light source and to reduce the effect that a slight shift of the spectral transmittance characteristics of the color filters exerts on the spectral distributions of the lights after color separated.

Abstract: A light-source device comprising: a rod integrator having an injection end and an emitting end; a lens unit for collecting a luminous flux emitted from the emitting end; and, a diaphragm. The rod integrator forms a plurality of imaginary light-source points, each of which virtually emits the luminous flux toward the emitting end. The diaphragm is disposed in the vicinity of a plane on which the lens unit forms the images of the imaginary light-source points, and selectively blocks luminous flux emitted from each of the images of the imaginary light-source points.

Abstract: A refracting optical lens 15 is provided to project light from transmitting means onto a convex mirror 16 to correct for pincushion distortion of the convex mirror 16.

Abstract: A wide angle projection lens consists of a Gnp lens group having positive refractive power and a Gf lens group having positive refractive power in the order from a large conjugate side toward a small conjugate side, and further the Gnp lens group consists of a Gn lens group having negative refractive power and a Gp lens group having positive refractive power in the order from the large conjugate side toward the small conjugate side, while satisfying −1.8<fn/f<−1.1, 3.2<fp/f<5.5, 1.2<Dnp/f<2.4 and 2.8<ff/fnp<4.4, where f: focal length of the whole lens system, fn: focal length of the Gn lens group, fp: focal length of the Gp lens group, Dnp: air spacing between the Gn lens group and the Gp lens group, fnp: focal length of the Gnp lens group and ff: focal length of the Gf lens group.

Abstract: A lighting system comprising converging means (1, 2) for converging a light emitted from an illuminant to form a converged image, a light mixing element 3 for having an end face of incidence 31 near the position at which the converged image is formed, and reducing an irregular luminance of the converged image of the illuminant to form a uniform light source face on an end face of emergence 32, and an optical system for transmission for directing an illuminating light flux from the plane of light emergence onto the illuminated face 5 side in a non-telecentric state, a first lens group 45 and a second lens group 46 being arranged in order from the light mixing element 3 side to the illuminated face 5 side of a light bulb, in which a first optical conjugate relation exists between the end face of incidence 31 of the light mixing element 3 and a virtual face at a position of a aperture stop 6 disposed in the vicinity of a lens means final face closest to the illuminated face constituting the second lens group in

Abstract: A prism (1) has a first inner surface (114A) and a second inner surface (122) in its interior. The first inner surface (114A) performs total reflection of all rays (20) entering from the exterior, and is disposed apart from a variable mirror element (3) disposed in the exterior, such that the reflected rays are irradiated to the variable mirror element (3). The second inner surface (122) is disposed in proximity to the variable mirror element (3), and totally reflects a bundle of OFF rays from the variable mirror element (3), while allowing a bundle of ON rays from the variable mirror element (3) to pass therethrough.

Abstract: An optical device including an illuminant for emitting light; light condensing element composed of a reflecting mirror whose shape of reflecting plane is of rotational secondary curved surface and a condenser lens for converging approximately parallel fluxes; a mixing rod whose section is quadrangle, first lens element composed of at least one lens; and a reflecting optical element which is disposed near the position where a plurality of tertiary illuminants are formed and which reflects light in a desired direction. This optical device allows a distribution of illuminance whose intensity is highly uniform to be obtained even when a light flux is inputted from a direction inclined from the normal direction of the plane-to-be-illuminated by illuminating the optical device disposed out of an optical axis of the illuminator.

Abstract: A retrofocus lens system comprises a first lens group having a negative power, a second lens group having a positive power, and a third lens group having a positive power. The first lens group includes a first lens, a meniscus-shaped second lens having a negative power and a convex surface facing the large conjugate side, a third lens having a negative power, and a fourth lens. The second lens group includes a fifth lens having a positive power. The third lens group includes a sixth lens having a negative power, both surfaces of which are concave, a seventh lens having a positive power, both surfaces of which are convex, an eighth lens having a positive power, both surfaces of which are convex, and a ninth lens having a positive axial power. The system satisfies 0.9<f2/f3<1.8, 1.5<|f1|/f<2.

Abstract: A wide angle projection lens consists of a Gnp lens group having positive refractive power and a Gf lens group having positive refractive power in the order from a large conjugate side toward a small conjugate side, and further the Gnp lens group consists of a Gn lens group having negative refractive power and a Gp lens group having positive refractive power in the order from the large conjugate side toward the small conjugate side, while satisfying −1.8<fn/f<−1.1, 3.2<fp/f<5.5, 1.2<Dnp/f<2.4 and 2.8<ff/fnp<4.4, where f: focal length of the whole lens system, fn: focal length of the Gn lens group, fp: focal length of the Gp lens group, Dnp: air spacing between the Gn lens group and the Gp lens group, fnp: focal length of the Gnp lens group and ff: focal length of the Of lens group.

Abstract: An illumination apparatus and a projection type display apparatus of lower cost are provided, in which extra-axial aberrations, especially distortion and lateral aberration, are favorably corrected, and the dimensional margin of illumination is suppressed to enhance the utilization factor of light. The illumination apparatus includes a first group of lenses which includes a meniscus lens having a positive refracting power, a second group of lenses which includes first lens means having a negative refracting power and second lens means having a positive refracting power, and lens means whose surface immediately before a surface to-be-illuminated is a plane surface, whereby an illuminating light beam is caused to exit in a telecentric state.

Abstract: A retrofocus lens system has a negative first, a positive second and a positive third lens group. The first lens group includes an aspheric first lens, a negative meniscus second and third lenses that are convex on the large conjugate side, and a negative meniscus fourth lens being convex on the small conjugate side. The second lens group includes a positive fifth lens and a sixth lens joined to the fifth lens. The third lens group includes a positive meniscus seventh lens being convex on the small conjugate side, a biconcave eighth lens, a positive ninth lens joined to the eighth lens, a biconvex tenth and eleventh lenses, and an aspheric twelfth lens. The system satisfies 0.8<f2/f3<1.5, 1.6<|f1|/f<2.

Abstract: A field-sequential color image display device receives red, green, and blue image data, and decomposes the received data into more than three monochromatic images. The monochromatic images may include at least two red, two green, and two blue images. Alternatively, the monochromatic images may include one white image and at least one red, one green, and one blue image. The monochromatic images are displayed sequentially, each monochromatic image followed by another monochromatic image of a different color. The increased number of monochromatic images alleviates the problem of color breakup.

Abstract: A light-source device comprising: a rod integrator having an injection end and an emitting end; a lens unit for collecting a luminous flux emitted from the emitting end; and, a diaphragm. The rod integrator forms a plurality of imaginary light-source points, each of which virtually emits the luminous flux toward the emitting end. The diaphragm is disposed in the vicinity of a plane on which the lens unit forms the images of the imaginary light-source points, and selectively blocks luminous flux emitted from each of the images of the imaginary light-source points.

Abstract: There is disclosed a display device using a color wheel having a color filter Cw, in addition to normal color filters corresponding to the three primary colors. The filter Cw has almost flat spectral transmission characteristics. Brightness information included in a color image signal is quantized with (n+m) bits. Information corresponding to the lower-order n bits is displayed by light transmitted through the filter Cw. Information corresponding to the upper-order n bits is displayed by light transmitted through the normal color filters. Only brightness information to which the human eye is visually sensitive is reproduced by the filter Cw having a lower transmissivity. This can eliminate a lack of the number of gray levels due to a constraint on the minimum switching speed of a light valve. Furthermore, the brightness little deteriorates.

Abstract: An illumination apparatus and a projection type display apparatus of lower cost are provided, in which extra-axial aberrations, especially distortion and lateral aberration, are favorably corrected, and the dimensional margin of illumination is suppressed to enhance the utilization factor of light. The illumination apparatus includes a first group of lenses which includes a meniscus lens having a positive refracting power, a second group of lenses which includes first lens means having a negative refracting power and second lens means having a positive refracting power, and lens means whose surface immediately before a surface to-be-illuminated is a plane surface, whereby an illuminating light beam is caused to exit in a telecentric state.