Patent application number | Description | Published |
20130314800 | PROJECTION ZOOM LENS AND PROJECTION DISPLAY APPARATUS - A projection zoom lens having broad angle of view, high zoom ratio, and large back focus while aberrations are corrected satisfactorily, including a negative first lens group, a positive second lens group, a positive third lens group, a negative fourth lens group, a positive fifth lens group, and a positive sixth lens group from the magnification side and is telecentric on the reduction side. When zooming, the first and sixth lens groups are fixed while the second to fifth lens groups are moved and the fourth lens group is composed of one negative lens whose magnification side surface has a greater curvature in absolute value than that of the reduction side surface, and the zoom lens satisfies conditional expression (1): −12.011-28-2013 | |
20140022518 | PROJECTION OPTICAL SYSTEM AND PROJECTION DISPLAY APPARATUS - A projection optical system substantially consists of a first optical system composed of a plurality of lens groups and a second optical system composed of one reflection mirror having a convex aspherical surface arranged in this order from the reduction side, in which all optical surfaces constituting the first and second optical systems are formed so as to have rotationally symmetrical shapes around one common axis, the projection optical system is configured such that focus adjustment is performed by individually moving two lens groups in the first optical system along the common axis, and the lens disposed on the most magnification side in the reduction side lens group of the two lens groups is a lens having a convex surface on the magnification side, thereby magnifying and projecting an image formed on a conjugate plane on the reduction side to a conjugate plane on the magnification side. | 01-23-2014 |
20140022519 | PROJECTION OPTICAL SYSTEM AND PROJECTION DISPLAY APPARATUS - A projection optical system substantially consists of a first optical system composed of a plurality of lenses and a second optical system composed of one reflection mirror having a convex aspherical surface arranged in this order from the reduction side and is configured, when an air space between the first optical system and the second optical system is taken as T | 01-23-2014 |
20140078595 | VARIABLE-MAGNIFICATION PROJECTION OPTICAL SYSTEM AND PROJECTION DISPLAY DEVICE - A positive first lens group that is fixed during magnification change, a negative second lens group that is movable during magnification change, a positive third lens group that is movable during magnification change, a positive fourth lens group that is movable during magnification change, and a positive fifth lens group that is fixed during magnification change are arranged in this order from the enlargement side. The system is telecentric at the reduction side. Conditional expression (1) is satisfied: | 03-20-2014 |
20140247504 | ZOOM LENS FOR PROJECTION AND PROJECTION-TYPE DISPLAY APPARATS - A zoom lens for projection substantially consists of a first lens-group having negative refractive-power, and which is arranged on a most magnification-side, and which is fixed during magnification change, a second lens-group having negative refractive-power, and which is arranged on a reduction-side of the first lens-group, and which is fixed during magnification change, a last lens-group having positive refractive-power, and which is arranged on a most reduction-side, and which is fixed during magnification change, and three lens-groups arranged between the last lens-group and the second lens-group, and which move during magnification change. The zoom lens is configured to be telecentric on a reduction-side, and focusing is performed by moving only the second lens-group. The lens-groups that move during magnification change are substantially a third lens-group having positive refractive-power, a fourth lens-group having positive refractive-power and a fifth lens-group having positive refractive-power, which are arranged in this order form a magnification-side. | 09-04-2014 |
20140254027 | PROJECTION ZOOM LENS AND PROJECTION TYPE DISPLAY DEVICE - The projection zoom lens substantially consists of a first lens group having negative refractive power, a second lens groups through a fourth lens group all having positive refractive power, a fifth lens group having positive or negative refractive power, and a sixth lens group having positive refractive power, arranged in this order from the magnification side; wherein the reduction side is telecentric. Further, the first lens group and the sixth lens group are fixed and the second lens group through the fifth lens group move along the optical axis while changing magnification. The fourth lens group substantially consists of only one positive meniscus lens with a concave surface toward the reduction side. The projection zoom lens satisfies conditional expression (1) below: | 09-11-2014 |
20150070778 | VARIABLE MAGNIFICATION PROJECTION OPTICAL SYSTEM AND PROJECTION DISPLAY APPARATUS - A variable magnification projection optical system substantially consisting of two lens groups of a first lens group having a positive refractive power and is moved during magnification change, and a second lens group having a positive refractive power and is moved during magnification change, in which the variable magnification projection optical system is configured such that the reduction side is telecentric. | 03-12-2015 |
20150077722 | PROJECTION OPTICAL SYSTEM AND PROJECTION-TYPE DISPLAY APPARATUS - In a projection optical system that projects an image displayed on an image display device arranged on a reduction-side conjugate plane onto a magnification-side conjugate plane, as a magnified image, the projection optical system includes a refractive optical system and a reflective optical system having negative refractive power in this order from a reduction side. Further, the following conditional formula (1) is satisfied: | 03-19-2015 |
20150077723 | PROJECTION OPTICAL SYSTEM AND PROJECTION-TYPE DISPLAY APPARATUS - In a projection optical system that projects an image displayed on an image display device arranged on a reduction-side conjugate plane onto a magnification-side conjugate plane, as a magnified image, the projection optical system includes a refractive optical system and a reflective optical system having negative refractive power in this order from a reduction side. Further, the following conditional formula (1) is satisfied: | 03-19-2015 |
20150077724 | PROJECTION OPTICAL SYSTEM AND PROJECTION-TYPE DISPLAY APPARATUS - In a projection optical system that projects an image displayed on an image display device arranged on a reduction-side conjugate plane onto a magnification-side conjugate plane, as a magnified image, the projection optical system includes a refractive optical system and a reflective optical system having negative refractive power in this order from a reduction side. Further, the following conditional formula ( | 03-19-2015 |