Abstract: With the width d of the incidence-side light guide portion of a first light guide and the width d of the incidence-side light guide portion of a second light guide, the width W1 of the emission-side light guide portion of the first light guide and the width W2 of the emission-side light guide portion of the second light guide are set to satisfy the relationship of d<W1=W2. In the first light guide, substantially all of the light that has been emitted from the incidence-side light guide portion and has been transmitted through the intersection can be captured by the emission-side light guide portion without being leaked out. In the second light guide, substantially all of the light that has been emitted from the incidence-side light guide portion and has been transmitted through the intersection can be captured by the emission-side light guide portion without being leaked out. Consequently, light loss can be reduced significantly.

Abstract: A planar light guide includes recesses formed in the upper and lower surfaces thereof. The recesses in the lower surface are perpendicular to the recesses in the upper surface. In a state in which light sources emit light into the planar light guide, when an X-direction driving mechanism is driven and the planar light guide is deformed in the X directions, the recesses in the upper surface are opened, so that the lower surface side can perform surface emission of light. When a Y-direction driving mechanism is driven and the planar light guide is deformed in the Y directions, the recesses in the lower surface are opened, so that the upper surface side can perform surface emission of light. By selectively driving the X-direction driving mechanism or the Y-direction driving mechanism, the position from which light is output, the amount of light, or the direction of light can be changed.