| 摘要 |
PURPOSE:To miniaturize a device and to excellently diverge heat by thinning negative lenses placed between a light source and an LCD by forming the negative lenses corresponding to the character elements of driving information on a lens plate and to improve the visibility of the driving information by enhancing the brightness of the device. CONSTITUTION:The lens plate 7 is provided between the light source 2 and the LCD 1 and the negative lenses 4A respectively corresponding to the characters of the driving information displayed on the LCD 1 are formed on the surface side of the plate 7 adjacent to the LCD 1. A light reflecting layer 8 is provided on the surface-side part of the lens 7 on which the lens 4A is not formed and which is adjacent to the LCD 1. Since the lens 4A is the cylindrical concave lens, the curvature thereof in a longitudinal direction is zero. Besides, since it is enough to set the size thereof in a width direction almost equal to the width of the dot-drawing of the numerical character of driving speed displayed on the LCD 1, the lens becomes thin though the curvature of the lens surface is large. Therefore, it is advantageous for miniaturizing an HUD projection unit and radiating the heat discharged from a light source lamp. |
