ELECTRONIC PEN ATTACHMENT, ELECTRONIC PEN SYSTEM, AND IMAGE DISPLAY SYSTEM COMPRISING ELECTRONIC PEN SYSTEM

摘要

An objective of the present invention is to allow using, at a location removed from an image display screen of an image display device, an electronic pen which is used in contact with the image display screen. To this end, an electronic pen attachment (80) is detachably mounted upon an electronic pen having a photoreceptor element. The electronic pen attachment comprises: a body part (81) whereupon an aperture part (89) is formed for mounting detachably upon the electronic pen; and a light gathering lens (82) which is attached to the body part. Light which enters from an end part on the side opposite the aperture into the body part traverses the light gathering lens, and the light is gathered in the photoreceptor element of the electronic pen which is mounted upon the aperture part.