TARGET PRESENTATION DEVICE, IMAGE DISPLAY SYSTEM, AND DISPLAY DEVICE FOR VEHICLE

摘要

A target presentation device comprises a concave mirror, a half mirror 3, and a movement device 4. The concave mirror 2 presents the virtual image of the image displayed on the image display device to the observer. The concave mirror is disposed such that the optical distance between the image display device and the concave mirror is set to be shorter than the focal point distance. The half mirror crosses and is inclined with the optical axis of the concave mirror. The optical axis passes through the observation position of the observer. The movement device moves the image display device to vary the image display device, whereby the optical distance is varied within the focus distance. The movement device moves the image display device to increase the virtual image's movement speed as the optical distance becomes long. Consequently, the fatigue of the focusing function of the observer is reduced.