| Patent Number |
Title Of Patent |
Date Issued |
| 7597446 |
Illumination optical system and image projection apparatus |
October 6, 2009 |
| An illumination optical system is disclosed which capable of uniformly illuminating a surface to be illuminated. The illumination optical system comprises a polarization conversion element which converts a luminous flux from a light source into a luminous flux having a certain polari |
| 7472995 |
Wavelength-selective polarization conversion element, projection displaying optical system and i |
January 6, 2009 |
| A wavelength-selective polarization conversion element is disclosed, which is capable of reducing the number of optical elements in an optical system and simplifying the configuration thereof. The polarization conversion element comprises a beam splitting film which splits light by t |
| 7466368 |
Image projection apparatus and adjusting method used for the same |
December 16, 2008 |
| An image projection apparatus includes a first reflection type liquid crystal display device for modulating and reflecting red light, a second reflection type liquid crystal display device for modulating and reflecting green light, a third reflection type liquid crystal display devic |
| 7258445 |
Polarization splitter, optical unit and image projector |
August 21, 2007 |
| A polarization splitter includes first and second glass members, and a polarization splitting layer and an adhesive layer arranged between the first and second glass members, wherein the polarization splitter satisfies .alpha..sup.2.times.E<6000000 and K>0.5, where .alpha. is a |
| 7064773 |
Display apparatus |
June 20, 2006 |
| A display apparatus is constructed to make a plurality of light beams of mutually different colors incident to a display element and modulate the beams of the respective colors by the display element to form images of the respective colors. Purity of a predetermined color out of the colo |
| 6646809 |
Image display apparatus, image display system, and image display element |
November 11, 2003 |
| An image display apparatus includes a light source for emitting illumination light, an image display element for displaying an image by reflecting incident light, an illumination optical element which reflects the illumination light from the light source toward the image display elem |
| 6637892 |
Projection apparatus |
October 28, 2003 |
| In a projection apparatus, an optical integrator is illuminated with light from a light source, one or more image display elements is irradiated with a plurality of beams from the integrator, and image light from the image display element or elements is projected by a projection optical |
| 6634755 |
Illuminating device and projector |
October 21, 2003 |
| In an illuminating device in which a light from a light source is separated into three color lights differing in optical path from one another by a color separating system, and light modulating elements conforming to the respective color lights are illuminated with the color lights, at l |
| 6611381 |
Display element, polarizing plate, and display apparatus and projecting apparatus using the disp |
August 26, 2003 |
| This invention provides a liquid crystal display apparatus which can reduce thermal load on a polarizing plate or display element, decrease the number of components necessary for reducing the thermal load on the polarizing plate, and reduce cost by decreasing the power consumption of a c |
| 6552854 |
Image display apparatus and optical system |
April 22, 2003 |
| An image display apparatus includes a light source for supplying illumination light, a reflection type display element for modulating the illumination light into image light by reflecting the light, an illumination optical system for guiding the illumination light to the reflection t |
| 6513934 |
Projection apparatus and observation apparatus |
February 4, 2003 |
| A projection apparatus having a light source, a color separating system for separating the light from the light source into a plurality of color beams, a plurality of light modulating elements for modulating the separated color beams, based on an image signal, a color combining system |
| 6490095 |
Image display apparatus |
December 3, 2002 |
| An image display apparatus includes a light source for supplying illumination light, a reflective display element for reflecting and modulating the illumination light into image light, a first optical system for guiding the illumination light to the reflective display element, and a |
| 6464362 |
Illuminating apparatus |
October 15, 2002 |
| For increasing the illumination efficiency to a liquid-crystal display element, an illuminating apparatus has a reflector for reflecting light from a light source, a negative meniscus lens, which is convex on the light source side, a first lens array unit of lens elements, a second lens |
| 6457832 |
Illumination apparatus and projection apparatus compensating for transverse aberration at an ill |
October 1, 2002 |
| An illumination apparatus is constructed to illuminate an effective range of a surface, rectangular in shape, to be illuminated with light from a light source via a first lens array, a second lens array, and a condensing optical system. Wherein the illumination apparatus satisfies condit |
| 6452727 |
Projection lens |
September 17, 2002 |
| A projection lens arranged to project an image formed on a display panel onto a screen includes a plurality of lens units movable along an axis for varying magnification, wherein at least one of lenses constituting the plurality of lens units has at least one lens surface of shape having |
| 6431727 |
Illumination device for selectively compressing light from light sources and projection type dis |
August 13, 2002 |
| This specification discloses an illuminating device in which lights emitted from a plurality of light sources are made into substantially parallel lights and are made to enter a lens array system, and illumination is effected by the lights from the lens array system, characterized in tha |
| 6406149 |
Illuminating apparatus and projecting apparatus |
June 18, 2002 |
| An illuminating apparatus includes a condensing optical system for converting light from a light source into convergent light, a first convex lens array for receiving the convergent light, and a collimating optical system for making a plurality of light beams from the first convex lens |
| 6351332 |
Optical low-pass filter and optical apparatus having the same |
February 26, 2002 |
| An optical low-pass filter comprises a phase advancing area which advances a phase of a wavefront of an incident pencil of rays with respect to a phase of a wavefront of a center of the incident pencil of rays, and a phase retarding area which retards the phase of the wavefront of the |
| 6327092 |
Cross dichroic prism |
December 4, 2001 |
| In a cross dichroic prism wherein four square pillar prisms of which the total of the angles including the prism ridge lines is 360.degree. are joined together with the prism ridge lines thereof made coincident with one another and prism sides forming the respective prism ridge lines are |
| 6310728 |
Image viewing apparatus |
October 30, 2001 |
| An image viewing apparatus has a stop for limiting light from an original image, and a viewing optical system for guiding the light from the original image, limited by the stop, to the eye of a viewer. The viewing optical system has a prism body including an entrance surface into which |
| 6292301 |
Optical viewing system for use in head-mounted display |
September 18, 2001 |
| An optical system having a first optical acting surface and a second optical acting surface in an optical path between a focal plane and a stop. In the optical path traced from the focal plane to the stop, light emitted from the focal plane is reflected by the second optical acting s |
| 6273568 |
Projection apparatus |
August 14, 2001 |
| A projection apparatus which is provided with a light source, a dichroic mirror for separating a light from the light source in a plurality of color lights, a display panel disposed on the optical path of each of the color lights, a first dichroic mirror for combining two color lights in |
| 6257726 |
Illuminating apparatus and projecting apparatus |
July 10, 2001 |
| An illuminating apparatus includes a condensing optical system for converting light from a light source into convergent light, and a first convex lens array for receiving the convergent light, and a collimating optical system for making a plurality of light beams from the first convex |
| 6246526 |
Light irradiating apparatus and image displaying apparatus |
June 12, 2001 |
| In a light irradiating apparatus, a first fly-eye lens and a second fly-eye lens are disposed in succession from a light source side. A first lens having negative refractive power is disposed more adjacent to the light source side than the first fly-eye lens. A second lens having positiv |
| 6212013 |
Projection type display apparatus |
April 3, 2001 |
| A projection type display apparatus is arranged to be able to implement both brightness-priority display and color-reproduction-priority display by itself. In the display apparatus, white light from a light source 1 is separated into beams of three colors by a color separation optical sy |
| 6144493 |
Optical low-pass filter and optical apparatus having the same |
November 7, 2000 |
| An optical low-pass filter comprises a phase advancing area which advances a phase of a wavefront of an incident pencil of rays with respect to a phase of a wavefront of a center of the incident pencil of rays, and a phase retarding area which retards the phase of the wavefront of the |
| 6031587 |
Optical member, optical instrument including the same, and method of manufacturing the optical m |
February 29, 2000 |
| An optical member used in a color composition system of an optical instrument, such as a projector, includesa prism member formed by joining a plurality of prisms, and a plurality of image forming units fixed to the prism member, wherein joint surfaces of the plurality of prisms reflect |
| 5815741 |
Image observing apparatus and imaging apparatus utilizing the image observing apparatus |
September 29, 1998 |
| An image observing apparatus according to the present invention includes: an optical element including a first face inclined relative to an observer, a second face composed of a reflective concave side, and a third face which the light from the image enters so as to have overall a po |
| 5706136 |
Optical system, and image observing apparatus and image pickup apparatus using it |
January 6, 1998 |
| The present invention relates to an optical system apparatus, which has a first surface symmetric with respect to only one symmetry plane and a second surface symmetric with respect to only the symmetry plane, in which the first plane is a reflective, concave surface and is inclined rela |
| 5689736 |
Image observation apparatus |
November 18, 1997 |
| The present invention relates to an image observation apparatus which comprises an optical system having a plurality of reflecting surfaces and a positive refracting power to guide light from an image to an observer and a visual axis detection system including a light source for illu |
