| http://www.w3.org/ns/prov#value | - By the above-described configuration, by judging whether or not the apparatus casing is in such a state that it came close to a head of a user, on the basis of a detection result of the sensor means, and by changing a drive operation such as a drive system, drive frequency, it becomes possible to suppress vibration noises, resonance noises due to drive of the display means, and even in case that a
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