LIGHT GUIDE UNIT AND IMAGE DISPLAY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a light guide unit and an image display device, in which a favorable image can be observed in a wide range even when the device is reduced in size and in weight.SOLUTION: A light guide unit 9 includes: a collimator lens 4; an entrance surface 7a where a luminous flux Lconverted into parallel beams by the collimator lens 4 is incident; a luminous flux splitting optical element 7 which splits the luminous flux Lincident to the entrance surface 7a into a luminous flux group Lpropagating in a direction parallel to the optical axis of the luminous flux Lin a region extending on both sides of the optical axis in a first direction intersecting the optical axis; a coupling reflection part 6a which reflects the luminous flux group Linto a second direction intersecting the optical axis and the first direction; a planar light guide plate 6 which guides the luminous flux group Lreflected by the coupling reflection part 6a; and a luminous flux splitting part 6c which splits the luminous flux group Lguided by the light guide plate 6 into a luminous flux group Lhaving a distribution in the first direction and in the second direction.