Illumination device, projection video display device, and fly-eye lens
AssigneeSanyo Electric Co., Ltd.
InventorShinya MATSUMOTO
Life of this patent
Estimating the term…
Abstract
An illumination device includes a light source for emitting a light flux having a solid angle; an optical element for converging the light from the light source in at least one direction to convert the light into parallel light; and a fly-eye lens for allowing incidence of the parallel light from the optical element to guide uniform light to an area for illumination. Assuming that a certain number of lens cells in the fly-eye lens in a column direction or a row direction are defined as a lens cell unit, one of the lens cell units is relatively displaced with respect to the other one of the lens cell units in the column direction or the row direction, and the number of steps for displacement among the lens cell units in the fly-eye lens is set to 2 or more.
Claims6
An illumination device, comprising:
- a light source;
- an optical element for converting light from the light source into parallel light in at least one direction;
- and
- a fly-eye lens for allowing incidence of the parallel light from the optical element to guide uniform light to an area for illumination, wherein
- assuming that a certain number of lens cells in the fly-eye lens in a column direction or a row direction are defined as a lens cell unit, one of the lens cell units is relatively displaced with respect to the other one of the lens cell units in the column direction or the row direction, and the number of steps for displacement among the lens cell units in the fly-eye lens is set to 2 or more.
A projection video display device, comprising:
- an illumination device for irradiating light onto an area for illumination;
- and
- an imager to be disposed in the area for illumination,
- the illumination device including:
- a light source;
- an optical element for converting light from the light source into parallel light in at least one direction;
- and
- a fly-eye lens for allowing incidence of the parallel light from the optical element to guide uniform light to the area for illumination, wherein
- assuming that a certain number of lens cells in the fly-eye lens in a column direction or a row direction are defined as a lens cell unit, one of the lens cell units is relatively displaced with respect to the other one of the lens cell units in the column direction or the row direction, and the number of steps for displacement among the lens cell units in the fly-eye lens is set to 2 or more.
A fly-eye lens, wherein
- assuming that a certain number of lens cells in the fly-eye lens in a column direction or a row direction are defined as a lens cell unit, one of the lens cell units is relatively displaced with respect to the other one of the lens cell units in the column direction or the row direction, and the number of steps for displacement among the lens cell units in the fly-eye lens is set to 2 or more.
Dependencies are inferred from the claim text.