Projector having a light transmitting window movably disposed in-front of the zoom lens and a control method for the same
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United States of America Patent
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Apr 8, 2014
Grant Date -
Aug 18, 2011
app pub date -
Oct 31, 2008
filing date -
Oct 31, 2008
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A safe, highly bright projector is to be implemented. A projector directs a light beam from a light source (101) to an image modulating device (105), and magnifies and projects an image formed at the image modulating device (105) through a zoom lens (102). This projector has a light transmitting window (103) movably disposed in front of the surface of the light outgoing side of the zoom lens (102) along the optical axis. The projector further has a window position control unit (108) to control the position of the light transmitting window (103) so as not to change the light beam region that appears on the outer surface of the light transmitting window (103) as the focal length of the zoom lens (102) is varied.
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