Projection type image display apparatus having a projection...

Details Projection type image display apparatus having a projection... Projection type image display apparatus having a projection...

2008-05-21

2010-11-09

Le, Que T (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S201200

Reexamination Certificate

active

07829835

ABSTRACT:
Disclosed is a projection type image display apparatus including a projection section to output a projection light in which an image is attached through a projector lens and a photographing section to photograph a projected image projected by the projection section through a photographing lens, and the projected image which is projected on a screen by the projection section is obtained by the photographing section and a focus of the projected image is adjusted based on a photographing result of the image obtained by the photographing section, and the projector lens and the photographing lens are movable in a direction to change the focus of the projected image or a focus of the photographed image by a same drive section.

REFERENCES:
patent: 7494229 (2009-02-01), Miyasaka
patent: 2003-15218 (2003-01-01), None
patent: 2005-241713 (2005-09-01), None
patent: 2006-98789 (2006-04-01), None

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