Target presentation device, image display system, and...

A - Human Necessities – 61 – F

Patent

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Details

A61F 9/00 (2006.01) A61B 3/028 (2006.01) A61F 5/00 (2006.01) A61F 9/007 (2006.01)

Patent

CA 2742155

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.

L'invention porte sur un dispositif de présentation de cible qui inclut un miroir concave (2), un demi-miroir (3) et un dispositif de déplacement (4). Le miroir concave (2) est disposé de telle sorte que le trajet optique entre un dispositif d'affichage d'image (1) et le miroir concave (2) devient plus court que la distance focale du miroir concave (2), afin de présenter à un observateur (P) une image virtuelle d'une image affichée sur le dispositif d'affichage d'image (1). Le demi-miroir (3) est disposé de manière oblique par rapport à l'axe optique (Lx) du miroir concave (2). L'axe optique (Lx) du miroir concave (2) passe par la position d'observation de l'observateur (P). Le dispositif de déplacement (4) fait varier le trajet optique dans une plage plus courte que la distance focale du miroir concave (2), par déplacement du dispositif d'affichage d'image (1). A ce moment, le dispositif de déplacement (4) déplace le dispositif d'affichage d'image (1) de telle sorte que, plus le trajet optique est long, plus la vitesse de déplacement de l'image virtuelle augmente. Il en résulte qu'on peut réduire suffisamment la fatigue de la fonction de focalisation de l'observateur (P).

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