Patent application number | Description | Published |
20080204609 | PROJECTOR-TYPE IMAGE DISPLAY APPARATUS - At least one exemplary embodiment is directed to a projector which includes several optical elements, reflective devices and beam splitters, arranged to reduce back reflection effects. At least one exemplary embodiment includes a mirror, two beam splitters, three reflection devices, and two optical elements affecting polarization of incident light upon the optical elements. | 08-28-2008 |
20080247049 | ZOOM LENS AND IMAGE PROJECTION APPARATUS - The zoom lens includes a plurality of lens units. The first lens unit is disposed closest to a magnification side in the plurality of lens units and has a negative optical power, and magnification-varying lens units that are disposed closer to a reduction side than the first lens unit and moves for variation of magnification. The first lens unit includes, in order from the magnification side, a first-A lens sub-unit having a negative optical power and a first-B lens sub-unit having a positive optical power. For focusing from an infinite side to a close side, the first-A and first-B lens sub-units move as a distance therebetween increases, and the first-B lens sub-unit moves toward the reduction side. The zoom lens is capable of correcting well variation of curvature of field due to a projection distance change and has a good optical performance. | 10-09-2008 |
20090009878 | PROJECTION LENS, IMAGE PROJECTION APPARATUS AND OPTICAL APPARATUS - The projection lens that projects a light flux from an object onto a projection surface. The projection lens includes a negative lens unit having a negative optical power, and a correction mechanism that tilts the negative lens unit with respect to an optical axis of the projection lens such that field tilt is generated in a direction opposite to a direction of field curvature generated at the projection surface. The projection lens reduces the generation of field curvature and its variation using a simple configuration. | 01-08-2009 |
20090195884 | ZOOM LENS AND IMAGE PROJECTION APPARATUS INCLUDING THE SAME - A zoom lens includes, in order from an enlargement conjugate side to a reduction conjugate side, a first lens unit of negative refractive power; a second lens unit of positive refractive power; a third lens unit of positive refractive power, the third lens unit having at least three lens elements; a middle lens unit including at least one lens unit; and a last lens unit of positive refractive power. All the lens units, except the first lens unit and the last lens unit, move during zooming. The zoom lens satisfies appropriate conditions. | 08-06-2009 |
20090213338 | ILLUMINATION OPTICAL SYSTEM AND IMAGE DISPLAY APPARATUS MAKING USE THEREOF - An illumination optical system for illuminating a surface to be illuminated with a light beam from a light source, in a first plane which is parallel with the optical axis of the illumination optical system, the light beam from the light source is split, and a plurality of first light source images are formed in a first light source image zone with the use of the thus split light beams; light beams from the plurality of first light source images being led to the surface to be illuminated, in a second plane which is parallel with the optical axis of the illumination optical system and which is perpendicular to the first plane, the light beam from the light source is split, and a plurality of second light source images are formed in a second light source image zone, with the use of the thus split light beams, light beams from the plurality of second light source images being led to the surface to be illuminated, where the width of the first light source image zone in the first plane is greater than that of the second light source image zone in the second plane. | 08-27-2009 |
20100073775 | ZOOM LENS AND IMAGE PROJECTION APPARATUS - A zoom lens includes a negative lens unit having a negative refractive power, at least one positive lens unit having a positive refractive power, an intermediate lens unit including a stop, and at least one reduction side lens unit, in order from a magnification conjugate side to a reduction conjugate side, at least two magnification side movable lens units in the negative lens unit and the at least one positive lens unit, and at least one reduction side movable lens unit in the at least one reduction side lens unit are moved during zooming, and conditions of 0.9<(X | 03-25-2010 |
20110002044 | ZOOM LENS AND IMAGE PROJECTION APPARATUS INCLUDING THE SAME - A zoom lens includes, in order from an enlargement conjugate side to a reduction conjugate side, a first lens unit of negative refractive power; a second lens unit of positive refractive power; a third lens unit of positive refractive power, the third lens unit having at least three lens elements; a middle lens unit including at least one lens unit; and a last lens unit of positive refractive power. All the lens units, except the first lens unit and the last lens unit, move during zooming. The zoom lens satisfies appropriate conditions. | 01-06-2011 |
20110032487 | COLOR SPLITTER AND COMBINER SYSTEM AND PROJECTION DISPLAY APPARATUS - A color splitter and combiner system includes a first transparent member located on an optical path between a first polarization beam splitter and an optical path combiner, and a second transparent member located on an optical path between a second polarization beam splitter and an optical path combiner. 0.05 (mm)<|t1/v1−t2/v2|<1.00 (mm) is met, where t1 is a thickness of the first transparent member, t2 is a thickness of the second transparent member, v1 is an Abbe number of a material of the first transparent member, and v2 is an Abbe number of a material of the second transparent member. | 02-10-2011 |
20110080565 | IMAGE PROJECTING APPARATUS - An image projecting apparatus includes an image display element, an optical system that projects an image displayed on the image display element onto a screen, an optical element that shifts in a direction perpendicular to an optical axis of the optical system, an adjusting mechanism that can shift the optical element in the direction perpendicular to the optical axis, and a holding member that fixes the optical element to a lens barrel, wherein a combined Abbe number vdch of materials of the optical element with respect to a d-line, a combined focal length fdch of the optical element with respect to the d-line, and the pixel pitch P of the image display element satisfy an appropriate condition. | 04-07-2011 |
20110149411 | ZOOM LENS - A zoom lens having less distortion and exhibiting good imaging performance is provided. A zoom lens includes a first lens unit provided at the extremity of an enlargement conjugate side and having a negative refractive power, and a final lens unit provided at the extremity of a reduction conjugate side and having a positive refractive power. The final lens unit includes a cemented lens at the extremity of the reduction conjugate side. The cemented lens has a positive refractive power. The zoom lens satisfies specific conditional expressions. | 06-23-2011 |
20120019787 | IMAGE PROJECTION APPARATUS UTILIZING REFLECTIVE IMAGE DISPLAY ELEMENT - An image projection apparatus includes a beam splitter configured to split light from a light source into first color light and second color light, a first reflective image display element configured to optically modulate the first color light, a second reflective image display element configured to optically modulate the second color light, a first parallel plate arranged between the beam splitter and the first reflective image display element and made of a large refractive index wavelength dispersion, and a second parallel plate arranged between the beam splitter and the second reflective image display element and made of a large refractive index wavelength dispersion. | 01-26-2012 |
20120075553 | ILLUMINATION OPTICAL SYSTEM AND IMAGE DISPLAY APPARATUS MAKING USE THEREOF - An illumination optical system for illuminating a surface with a light beam from a light source, in a first plane parallel with the optical axis, the light beam from the light source is split, and first light source images are formed in a first zone with the use of the thus split light beams; light beams from the first light source images being led to the surface, in a second plane parallel with the optical axis and perpendicular to the first plane, the light beam from the light source is split, and second light source images are formed in a second zone, with the use of the thus split light beams, light beams from the second light source images being led to the surface, where the width of the first zone in the first plane is greater than that of the second zone in the second plane. | 03-29-2012 |
20130033680 | IMAGING OPTICAL SYSTEM, LENS UNIT, AND IMAGE PROJECTION APPARATUS - An imaging optical system includes a lens unit that includes a plurality of optical elements, and an optical path combining portion that includes a flat plate disposed so as to be inclined with respect to an optical axis of the lens unit, and the lens unit includes a correction portion that has a shape asymmetric with respect to the optical axis in a cross section that is parallel to both a normal of the flat plate and the optical axis. | 02-07-2013 |
20130215401 | ILLUMINATION OPTICAL SYSTEM AND IMAGE PROJECTION APPARATUS - The illumination optical system includes, as optical elements, a condenser lens system ( | 08-22-2013 |
20140036142 | IMAGING OPTICAL SYSTEM, AND PROJECTION-TYPE IMAGE DISPLAY APPARATUS AND IMAGE PICKUP APPARATUS USING THE SAME - An imaging optical system includes a first optical unit having positive refractive power making an image at an image plane at an enlargement-side of the imaging optical system and an intermediate image at an intermediate image position in the imaging optical system conjugate to each other, and a second optical unit having positive refractive power making the intermediate image and an image at an image plane at a reduction-side of the imaging optical system conjugate to each other, wherein, when a focal length of the first optical unit is denoted by fF and a focal length of the second optical unit is denoted by fR, the following condition is satisfied: | 02-06-2014 |
20140118707 | ILLUMINATION OPTICAL SYSTEM AND PROJECTION-TYPE DISPLAY APPARATUS - An illumination optical system is configured to illuminate an optical modulator configured to modulate incident light and includes a condenser lens system that includes a meniscus lens with a concave on a light source side, and condenses light from a light source; and a spherical aberration corrector disposed on an optical modulator side of the condenser lens system. The illumination optical system satisfies: | 05-01-2014 |
20140192419 | OPTICAL SYSTEM AND IMAGE PROJECTION APPARATUS INCLUDING THE SAME - In an optical system including a front lens unit having negative refractive power, a stop, and a rear lens unit having positive refractive power in order from an enlargement side to a reduction side, the front lens unit has a combination lens in which a negative lens and a positive lens are adjacently arranged in order from the enlargement side to the reduction side, and a focal length of the negative lens f | 07-10-2014 |