Compact folded mirror camera and projector
Spatial light modulator with improved aperture ratio
Optical path converting optical element, optical path converter, and optical projector and image display apparatus using said optical element
Projection display unit
Polarization luminaire and projection display
Display optical apparatus
Projector modulating a plurality of partial luminous fluxes according to imaging information by means of an electro-optical device Patent #: 6491396
ApplicationNo. 962448 filed on 09/26/2001
US Classes:353/20, POLARIZER OR INTERFERENCE FILTER348/291, Combined with grating, lens array, or refractor353/38, UNITARY PLURAL REFRACTING SURFACES359/20Multiple point hologram (e.g., fly-eye lens, etc.)
ExaminersPrimary: Adams, Russell E.
Assistant: Cruz, Magda
Attorney, Agent or Firm
Foreign Patent References
International ClassesG03B 021/14
Foreign Application Priority Data2001-03-08 JP
AbstractAn illumination optical system comprises a first multi-lens array, a second multi-lens array, and a polarization conversion module. An optical modulation device of a projector is irradiated with light beams that are generated by passing incident light from a light source through the first multi-lens array, the second multi-lens array, and the polarization conversion module. The number of the first lens cells is greater than that of the polarization conversion units in a direction of an arrangement of the polarization conversion units. Further, each of particular ones among the polarization conversion units corresponds to at least two first lens cells in the direction of the arrangement of the polarization conversion units. Furthermore, the first lens cell in a portion where each of the particular ones corresponds to at least two first lens cells has such a decentered shape that a vertex of the first lens cell is off a center position of the first lens cell and closer to an incident axis passing a center of an opening of the corresponding polarization conversion unit.