Projection apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 11, 2014
Grant Date -
Feb 23, 2012
app pub date -
Aug 19, 2010
filing date -
Aug 19, 2010
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A projection apparatus includes an illumination system providing an illumination light beam, a light valve disposed in a transmission path of the illumination light beam and converting the illumination light beam into an image light beam, a projection lens disposed in a transmission path of the image light beam, a first field lens, and a second field lens. The first field lens and the second field lens are disposed between the light valve and the projection lens and in the transmission paths of the illumination light beam and the image light beam. The first field lens is a positive meniscus lens with a first concave surface facing the projection lens. The second field lens is a positive meniscus lens with a second concave surface adjacent to the first field lens. The projection apparatus is capable of reducing a ghost image.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully