| Patent Number |
Title Of Patent |
Date Issued |
| RE39859 |
Dichroic prism, prism unit, and projection display apparatus |
September 25, 2007 |
| At least one of four rectangular prisms in a dichroic prism is made longer than the other rectangular prisms. Parts of the rectangular surfaces of the long rectangular prisms partially protrude from the rectangular surfaces of the other rectangular prisms in the longitudinal direction. |
| RE39040 |
Projector |
March 28, 2006 |
| A projection-type display apparatus in accordance with the invention reduces the margin formed around the image forming range of the light valves, and forms a bright projected image. Emitted light from a light source lamp unit of a projection-type display apparatus illuminates liquid |
| RE38740 |
Dichroic prism and projection display apparatus |
June 7, 2005 |
| The invention provides a dichroic prism capable of reducing displacements of projection pixels of colors caused by chromatic aberration of magnification. A dichroic prism is formed in the shape of a quadrangular prism as a whole by joining four rectangular prisms together. A red refl |
| 7267443 |
Light-modulating projector |
September 11, 2007 |
| Exemplary embodiments of the invention provide a projector that can readily correct for chromatic aberration caused by, for example, a projecting lens without having to give a cross dichroic prism, for example, a special preliminary process. Illumination-light components modulated by |
| 6894845 |
System and methods for providing a zoom lens device |
May 17, 2005 |
| The invention provides a zoom lens device that can include lens groups. A third lens group (compensator lens group) can be disposed between two lens groups (a second and a fourth lens groups) forming a variator lens group. The two lens groups (the second and fourth lens groups) forming t |
| 6856375 |
Liquid crystal light valve and projection display device including the same |
February 15, 2005 |
| The invention provides a liquid crystal light valve that makes it possible to increase the life of a polarizer at a light-exiting-surface side of the liquid crystal light valve by reducing the burden thereon, and a projection display device that incorporates the liquid crystal light |
| 6669345 |
Illumination system and projector |
December 30, 2003 |
| A projector including an illumination system that illuminates a modulation device modulating light according to image information. The illumination system includes a light source that emits a light beam along a light source optical axis, a first lens array having a plurality of small len |
| 6637886 |
Projection display device |
October 28, 2003 |
| The invention accurately sets a polarization direction of a polarization element, and prevents deterioration of the usage efficiency of the light and a reduction in image contrast. Field lenses are provided on a projection display device. A polarizer is placed on a flat surface of a |
| 6612702 |
Projection display device |
September 2, 2003 |
| The invention accurately sets a polarization direction of a polarization element, and prevents deterioration of the usage efficiency of the light and a reduction in image contrast. Field lenses are provided on a projection display device. A polarizer is placed on a flat surface of a |
| 6540360 |
Projector |
April 1, 2003 |
| A projector is provided which can project a high quality image unaffected by dust, or the like, scattered in the projector by preventing the temperature of light-modulating elements from rising. Light transmissive plates are adhered to the light emitting surface of a liquid crystal panel |
| 6529250 |
Projector |
March 4, 2003 |
| A projection-type display apparatus of the invention aiming at solving the problem of heat generation caused by absorption of light by a polarizing means of a liquid crystal light valve. To overcome this problem, the projection-type display apparatus of the invention includes a light |
| 6517208 |
Illumination system and projector |
February 11, 2003 |
| A projector including an illumination system that illuminates a modulation device modulating light according to image information. The illumination system includes a light source that emits a light beam along a light source optical axis, a first lens array having a plurality of small len |
| 6425667 |
Projection lens unit and projector using the same |
July 30, 2002 |
| A projection lens unit is provided that is reduced in size and profile. The projection lens unit may include a plurality of lenses of which at least one lens disposed at the base end opposite to the projection direction is cut away at the upper portion thereof. The surface of the cut-awa |
| 6278500 |
Liquid crystal device and projector display device having a specific relationship for the F-numb |
August 21, 2001 |
| The invention prevents deterioration of the image quality caused by dust adhering to the surface of a liquid crystal device. The invention is a liquid crystal device that includes an emergent-side substrate section, an incident-side substrate section disposed opposing the emergent-side |
| 6172815 |
Dichroic prism and projection display apparatus |
January 9, 2001 |
| The invention provides a dichroic prism capable of reducing displacements of projection pixels of colors caused by chromatic aberration of magnification. A dichroic prism is formed in the shape of a quadrangular prism as a whole by joining four rectangular prisms together. A red refl |
| 6141150 |
Dichroic prism, prism unit, and projection display apparatus |
October 31, 2000 |
| At least one of four rectangular prisms in a dichroic prism is made longer than the other rectangular prisms. Parts of the rectangular surfaces of the long rectangular prisms partially protrude from the rectangular surfaces of the other rectangular prisms in the longitudinal direction. |
| 6084714 |
Polarizing illumination device and projection display device |
July 4, 2000 |
| A technique for preventing a decrease in the amount of effective polarized light that emerges from a polarizing conversion element array is provided. To this end, a polarizing illumination device includes a polarizing conversion element array that converts light emitted from a light sour |
| 6072635 |
Dichroic prism and projection display apparatus |
June 6, 2000 |
| The invention provides a dichroic prism capable of reducing displacements of projection pixels of colors caused by chromatic aberration of magnification. A dichroic prism is formed in the shape of a quadrangular prism as a whole by joining four rectangular prisms together. A red refl |
