| 摘要 |
PROBLEM TO BE SOLVED: To suppress a sense of anxiety provided to a viewer by letting the viewer know a reason why operation becomes impossible.SOLUTION: The error state determination device comprises: acquisition means for acquiring a detection signal of an optical sensor; ON state determination means for determining whether or not the detection signal acquired by the acquisition means is in an ON state; and error state determination means for, when the ON state determination means determines the signal is in the ON state for a predetermined time or more, determining an error state. |
