| 摘要 |
PROBLEM TO BE SOLVED: To accurately detect temperature rise in a cabinet even when the cabinet is installed upside down. SOLUTION: The cabinet 1 is provided with a light source 2 and a liquid crystal panel 7 irradiated by the light source 2 inside. At least two temperature sensors SE1 and SE2 outputting a signal showing that energizing the light source 2 should be cut off at the time of detecting that the temperature in the cabinet 1 reaches limit temperature at which optical parts in the cabinet 1 are damaged are respectively arranged up and down with respect to the light source 2. The respective sensors SE1 and SE2 output a signal for stopping power feeding to the light source 2 at the limit temperature at which the optical parts in the cabinet 1 are damaged in the normal posture or the reverse posture of the cabinet 1.
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