Image projection apparatus

Details Image projection apparatus Image projection apparatus

2011-01-11

2011-01-11

Lee, John R (Department: 2878)

Optics: image projectors

Temperature control

C353S101000, C359S820000

Reexamination Certificate

active

07866823

ABSTRACT:
An image projection apparatus is disclosed which is capable of correcting defocusing due to changes of the temperature of a projection lens, which are caused by various factors. The image projection apparatus includes an image-forming element which is illuminated with light from a light source, a projection lens which includes a focus lens and projects light from the image-forming element onto a projection surface, plural temperature detectors which are provided at positions different from each other in the image projection apparatus. The apparatus further includes a controller which controls the position of the focus lens on the basis of the detection results by the plural temperature detectors.

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Chinese Office Action dated Apr. 10, 2009, issued in corresponding Chinese Application No. 200710102311.9.

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