Patent application number | Description | Published |
20090015934 | PROJECTION ZOOM LENS DEVICE AND PROJECTION-TYPE DISPLAY APPARATUS - A projection zoom lens device includes, in order from a magnification side, a negative first group G | 01-15-2009 |
20090219624 | PROJECTION ZOOM LENS SYSTEM AND PROJECTION TYPE DISPLAY APPARATUS - The projection zoom lens system includes a negative first lens group, a positive second lens group, a third lens group, a positive fourth lens group, a fifth lens group, and a positive sixth lens group. The lens system is nearly telecentric on a reduction side. During zooming, the second to fifth lens groups are moved while the first and six lens groups remain stationary. The third lens group includes a positive lens L | 09-03-2009 |
20100053570 | PROJECTION LENS AND PROJECTION DISPLAY DEVICE USING THE SAME - Disclosed are a projection lens that has a small size, a simple inner focus structure, a high optical performance, and a wide angle of view of about 75 degrees or more, and a projection display device. | 03-04-2010 |
20100053764 | PROJECTION LENS AND PROJECTION DISPLAY DEVICE USING THE SAME - Disclosed are a projection lens that is faster than F1.95 and has a simple inner focus structure, a high optical performance, and a small size, and a projection display device. | 03-04-2010 |
20100053773 | PROJECTION LENS AND PROJECTION DISPLAY DEVICE USING THE SAME - Disclosed are a projection lens that has a simple inner focus structure, an appropriate back focal length, telecentricity, a high optical performance, and a small size and can effectively correct, particularly, lateral chromatic aberration, and a projection display device. | 03-04-2010 |
20100271601 | PROJECTING ZOOM LENS AND PROJECTION TYPE DISPLAY APPARATUS - The projecting zoom lens includes, sequentially from its magnification side, a negative first lens group, a positive second lens group, a negative third lens group, a positive fourth lens group, a positive or negative fifth lens group, and a positive six lens group, while the reduction side of the projecting zoom lens is formed as a telecentric system. When the power of the zoom lens is varied, the first lens group and sixth lens group are fixed, while the second to fifth lens groups move. In such power varying operation, the movement of the third lens group advances from the magnification side to the reduction side as the zoom lens goes from the wide angle end toward the tele end. | 10-28-2010 |
20100309562 | PROJECTION ZOOM LENS AND PROJECTION-TYPE DISPLAY APPARATUS - A projection zoom lens projects an optical image of rays, which are irradiated from a light source onto a light valve and are modulated by a predetermined image displayed on the light valve, onto a screen. The projection zoom lens includes a plurality of lens groups that is formed as a telecentric system on the reduction side thereof and includes at least two movable lens groups which are movable during zooming. In the projection zoom lens, the plurality of lens groups is arranged to include, in order from a magnification side, at least a first lens group and a second lens group. The first lens group has a negative refractive power, remains stationary during zooming, and performs focusing. The second lens group has a negative refractive power and remains stationary during zooming and focusing. | 12-09-2010 |
20110007401 | PROJECTION VARIABLE FOCUS LENS AND PROJECTION DISPLAY DEVICE - A projection variable focus lens includes seven lenses. The seven lenses include first to seventh lenses in order from a magnification side. The first and second lenses are provided closest to the magnification side and have a negative composite refractive power. The third lens has a positive refractive power. The fifth lens has a negative refractive power. The sixth lens has a positive refractive power. The seventh lens has a positive refractive power. A reduction side of a lens system is telecentric. The seven lenses are classified into three or more lens groups. Three or less lens groups among the three or more lens groups are moved to change a focal length. When the focal length varies from a wide angle end to a telephoto end, at least the third lens is moved from the reduction side to the magnification side along an optical axis. | 01-13-2011 |
20110007402 | PROJECTION VARIABLE FOCUS LENS AND PROJECTION DISPLAY DEVICE - An inexpensive projection variable focus lens includes six lenses and three or less lens groups which are moved when power varies, is telecentric, and is capable of effectively reducing all aberrations including astigmatism. Also, a projection display device includes the projection variable focus lens. | 01-13-2011 |
20110051101 | PROJECTION LENS AND PROJECTION-TYPE DISPLAY APPARATUS - A projection lens consists of first and second les groups and a stop. The first lens group is formed of a negative lens. The second lens group is formed of three positive lenses and a negative lens. The stop is disposed between the first and second lens groups or in the second lens group. The first and second lens groups are arranged in order from a magnification side. The projection lens is telecentric on a reduction side. The projection lens is configured to satisfy the following conditional expressions (1) and (2): | 03-03-2011 |
20110109975 | ZOOM LENS FOR PROJECTION AND PROJECTION-TYPE DISPLAY DEVICE - A zoom lens for projection includes negative first group G | 05-12-2011 |
20110109976 | ZOOM LENS FOR PROJECTION AND PROJECTION-TYPE DISPLAY DEVICE - In a zoom lens for projection, a lens group arranged farthest to the reduction side is fixed when the magnification of the zoom lens is changed, and is composed of a negative aspheric lens made of a plastic material having at least one aspheric surface and a positive lens. At least one positive lens arranged on the reduction side of a lens having the smallest effective diameter among lenses composing the zoom lens satisfies the following formula (1): | 05-12-2011 |
20150015967 | PROJECTION ZOOM LENS AND PROJECTION TYPE DISPLAY DEVICE - A projection zoom lens in which a magnification change operation is performed by moving three to four lens groups as moving groups, wherein a first lens group, which is a lens group on the most-magnification side, substantially consists of a moving group having a negative refractive power; a lens group on the most-reduction side is composed of a moving group having a positive refractive power; and the first lens group which is the lens group the most-magnification side substantially consists of two lenses. In this case, conditional formula (1) below is satisfied, where fw is the focal length of the entire system at the wide angle end and fm is the focal length of the lens group on the most-magnification side: | 01-15-2015 |