| 摘要 |
PROBLEM TO BE SOLVED: To provide a mirror device capable of imaging the cap and liquid level of a container by one camera without lowering inspection accuracy by image processing even when the prescribed height of the liquid level is moved up and down. SOLUTION: A mirror device for imaging the cap 2 and liquid surface 10 of a container 3 by one camera 5 is equipped with a first mirror group 10 reflecting the light from the cap 2 to guide the same to the camera 5, a second mirror group 20 reflecting the light from the liquid surface 1a to guide the same to the camera 5, and a mirror 30 for synthesizing the lights from the first and second mirror groups 10, 20 to allow them to be incident on the camera 5. When the prescribed height of the liquid surface 1a is moved up and down, not only the object mirror 21 in the second mirror group 20 is moved up and down but also the mirrors 22a, 22b succeeding to the object mirror 21 are moved up and down to regulate light path length.
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