| abstract |
An image display device that can suppress the occurrence of a ghost and can be easily reduced in size and weight as a whole. An image display device includes a light source 11 and a scanning unit, and the scanning unit includes (a) a first mirror 20, (b) a first light polarization unit 30, (c) a second mirror 40, and (D) The second light polarizing means 50 that receives the parallel light emitted from the second mirror 40 and emits the parallel light is provided, and a plurality of semi-transmissive films 51 are provided inside the second light deflecting means 50. The arrangement pitch of the semi-transmissive films 51 is P 2 , the thickness of the second light deflecting means 50 is t 2 , the angle formed with the light emitting surface of the semi-transmissive film 51 is ζ 2, and k is 0 And the light reflectance R 2 of the semi-transmissive film 51 at the wavelength of the light beam is R 2 ≦ k × {(P 2 / t 2 ) × tan (ζ 2 )} 1 / Satisfy 2 [Selection] Figure 1 |