| 摘要 |
An imaging system comprising a source of light movable with respect to a writing element and projectable thereon to generate an image, a focusing device is provided for focusing a light source which generates a first beam of light of a wavelength selected to be actinic with respect to the writing element. The focusing device includes a focusing light detector which is mounted adjacent the light source and is provided with a micromask to protect it from unwanted light to improve the sensitivity of the detector and the focusing device.
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