Patent application number | Description | Published |
20080247167 | DIFFRACTION OPTICAL ELEMENT, LIGHTING DEVICE, AND PROJECTOR - A diffraction optical element includes: a first diffraction pattern which diffracts entering light to produce illumination light for illuminating a first area; and a second diffraction pattern which is disposed adjacent to the first diffraction pattern and diffracts entering light to produce illumination light for illuminating a second area other than the first area by using at least a part of the diffracted light. | 10-09-2008 |
20090040467 | PROJECTOR AND PROJECTION UNIT - A projector includes: a light source which emits light; an image forming unit which forms an image having desired size by using light emitted from the light source; and a projection unit which projects the image formed by the image forming unit on a light receiving surface. The projection unit has a light diffusing member disposed at a position where an intermediate image corresponding to light released from the image forming unit is formed to diffuse the light, and a projection system which projects the light diffused by the light diffusing member on the light receiving surface. Diffusion intensity distribution of light released from a predetermined position of the light diffusing member contains at least two prominences with the center axis of the light interposed between the prominences. | 02-12-2009 |
20090244498 | PROJECTION APPARATUS AND IMAGE DISPLAY APPARATUS - A projection apparatus includes a first optical system, an aperture disposed on the light exiting-side of the first optical system, a second optical system disposed on the light exiting-side of the aperture, and a reflector disposed on the optical path between the first optical system and the second optical system, the reflector having a reflection surface that reflects the light having exited from the first optical system toward the second optical system. The optical axis of the second optical system is disposed along the optical axis of the first optical system. The reflection surface of the reflector is disposed along the optical axis of the first optical system. At least part of the first and second optical systems that is on the side opposite the reflection surface of the reflector is cut off. | 10-01-2009 |
20100123881 | Lighting Device and Projector - A lighting device includes: a light source which emits light around a light source axis; a reflector which has a plurality of reflection surfaces for reflecting light emitted from the light source; a plurality of converging units each of which is provided for the corresponding reflection surface of the plural reflection surfaces to receive light released from the corresponding reflection surface; and a stacking system which stacks light having passed the plural converging units on a light receiving area wherein each of the plural reflection surfaces is formed by a part of a spheroid having focuses at the position of the corresponding converging unit and the position of the light source, and each focal distance of the plural converging units becomes longer as the distance between the position of the converging unit and the light source axis increases. | 05-20-2010 |
20100157251 | ILLUMINATION APPARATUS, PROJECTOR, AND POLARIZATION CONVERSION ELEMENT - An illumination apparatus includes a light source device adapted to emit light having an asymmetric intensity distribution and a polarization conversion element adapted to align polarization states of the light emitted from the light source device. The polarization conversion element includes a splitting section adapted to split incident light input from the light source device into transmitted light and reflected light having the polarization states different from each other in a direction in which an intensity distribution of the incident light is asymmetric, a conversion section adapted to convert the polarization state of one of the transmitted light and the reflected light into the polarization state of the other of the transmitted light and the reflected light, and a mirror system. | 06-24-2010 |
20100302510 | LIGHT SOURCE DEVICE, ILLUMINATION SYSTEM, AND PROJECTOR - A light source device includes: a light source which emits light; a first reflector which surrounds a part of the light source and reflects the light emitted from the light source in the direction of an optical axis; and a second reflector which surrounds at least a part of the light source different from the part surrounded by the first reflector and reflects the light emitted from the light source toward the first reflector, wherein the position of a convergence spot of the light reflected by the second reflector is displaced from the position of an emission spot of the light source at least in the direction of a plane perpendicular to the direction of the optical axis. | 12-02-2010 |
20100321417 | DISPLAY DEVICE AND PROJECTION DISPLAY DEVICE - The invention provides a display device, a direct-view display device, and a projection display device in which their apparent dynamic ranges are increased with less color change. The display device can include a light modulation device having a plurality of pixels for displaying an image according to an image signal, a light source for illuminating the light modulation device, and a light-source driving device for controlling the intensity of light emitted from the light source by controlling the period in which the light source is lit at a specified brightness per unit time. | 12-23-2010 |
20110228232 | ILLUMINATION DEVICE AND PROJECTOR - An illumination device includes: a light source device adapted to emit an excitation light beam; and a rotating fluorescent plate having a single fluorescent layer adapted to convert a part or whole of the excitation light beam into a fluorescent light beam. The fluorescent light beam includes two or more colored light beams, and the single fluorescent layer is formed on a circular disk, which can be rotated by a motor, continuously along a circumferential direction of the circular disk. | 09-22-2011 |
20140152964 | ILLUMINATION DEVICE AND PROJECTOR - An illumination device includes: a light source device adapted to emit an excitation light beam; and a rotating fluorescent plate having a single fluorescent layer adapted to convert a part or whole of the excitation light beam into a fluorescent light beam. The fluorescent light beam includes two or more colored light beams, and the single fluorescent layer is formed on a circular disk, which can be rotated by a motor, continuously along a circumferential direction of the circular disk. | 06-05-2014 |