Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Projection optical apparatus










Image Number 6 for United States Patent #6798583.

The invention provides a small-sized projection optical apparatus which uses a decentered prism as a projection optical system and in which some contrivances are provided to how to introduce illumination light into a reflection type display device. The projection optical apparatus comprises a reflection type display device 1, a projection optical system 2 for providing projection of an image displayed thereon and an illumination light source for illuminating a display surface. The projection optical system 2 comprises a catadioptric optical element 10 having two rotationally asymmetric curved reflecting surfaces 12, 13 having positive power. The illumination light source is located such that both a light ray leaving the display surface and arriving at a projection display screen and a light ray leaving the illumination light source and arriving at the display surface are reflected at the first and second reflecting surfaces as counted from the display surface side of the catadioptric optical element 10, and that the axis of illumination light 6 incident on the catadioptric optical element 10 is not included in a plane that passes through the axis of projection light 7 leaving the catadioptric optical element 10 and the center of the display surface.








 
 
  Recently Added Patents
Light-emitting device, film-forming method and manufacturing apparatus thereof, and cleaning method of the manufacturing apparatus
Round carrying case
Image sensor and method for fabricating the same
Methods and devices for detecting and measuring environmental conditions in high performance device packages
Method, apparatus, and system for energy efficiency and energy conservation including dynamic cache sizing and cache operating voltage management for optimal power performance
System and method for determining payroll related insurance premiums
Canine iPS cells and method of producing same
  Randomly Featured Patents
Coolable outer air seal assembly for a gas turbine engine
Pneumatic sealing arrangement
Organometal complex, electroluminescence material using the complex, and electroluminescence element using the complex
Correction of fixed pattern noise
Golf ball with spherical polygonal dimples
Separable hospital gown
Frame structure for furniture, especially table frame structure
Sequential injection molding process
Magnetic disc
Method and apparatus for rate responsive adjustments in an implantable medical device