| 摘要 |
PROBLEM TO BE SOLVED: To automatically adjust the optical axis of a lens system. SOLUTION: The linear pattern in two directions of a chart 24 is image- formed on the image pickup surface of a sensor 5 through a lens system F including a lens F1 being a lens to be adjusted, a coma flare amount caused by eccentricity of the lens F1 is calculated from the distribution of the illuminance of two pairs of linear chart images, and eccentricity correction amount is obtained, so that XY fine adjustment stage 12 is driven to finely adjust the lens F1. Then, a stage for coarse adjustment where the lens F1 is moved stepwise so as to set a fine adjustment range from the data string of maximum luminance is provided before the fine adjustment stage.
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