| 摘要 |
PURPOSE:To prevent the generation of a temperature rise and an uneven temperature of a liquid crystal indicator so that a driving voltage of the liquid crystal indicator can be kept constant by separating a polarizing plate from the liquid crystal indicator, bringing cooling air into contact with the liquid crystal indicator and allowing it to flow. CONSTITUTION:Among the parts for constituting a liquid crystal indicator 36, polarizing plates 37, 38 which contribute exceedingly to a temperature rise (absorbs exceedingly a visible ray and a heat ray) are separated from the liquid crystal indicator 36, and also, cooling air for suppressing a temperature rise of the liquid crystal indicator 36 and the polarizing plates 37, 38 is allowed to pass through a gap between the polarizing plates 37, 38 and the liquid crystal indicator 36. In such a way, the liquid crystal indicator 36 is cooled efficiently, and also, the conduction to the liquid crystal indicator 36 of heat generated by the polarizing plates 37, 38 is prevented, and the driving voltage can be kept constant. |
