| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a projection device that enables detection of an optical axis deviation without being affected by external factors such as a tremor and the like.SOLUTION: A projection device is configured to: control intensity of a plurality of light beams emitted from a light source on the basis of an image signal; scan a synthesis beam of the plurality of light beams in a scanning area; spectroscopically split the synthesis beam scanned in a non-drawing area within the scanning area into a plurality of light by a spectroscopic element on the basis of a wavelength component of the synthesis beam; receive the plurality of spectroscopically split light by a plurality of light reception elements; and detect a position of the plurality of spectroscopically split light on the basis of an output of the light reception element. Herein, at timing when the light reception element receives the spectroscopically split light, all of the plurality of light beams are configured to be emitted from the light source.</p> |
