Parallax free light pen
AssigneeGeneral Dynamics Corporation
InventorFernand Bannie Kuffer
Life of this patent
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Abstract
A light pen sighting device for aligning the receptor of a light pen with an interactive display includes a support member in the form of a transparent plastic body having opposed parallel surfaces with a reticle in the form of points formed in the respective surfaces and a reflector disposed directly between and aligned with the reticle for reflecting light travelling along the axis of the reticle directly into the receptor of a light pen to which the device is mounted, thereby providing a parallex free light pen. An alternate embodiment utilizes fiber-optics for receiving and transmitting light to the receptor.
Claims18
A light pen sighting device for aligning the receptor of a light pen with a source of light for eliminating parallax between said source and the receptor, and comprising:
- support means for supporting sighting means on the barrel of a light pen adjacent to the receptor thereof,
- light receiving and transmitting means mounted by said support means and positioned for receiving and directing rays of light from a predetermined direction to the receptor of a light pen on which said support means is mounted,
- means defining first and second spaced apart reticle means disposed on opposite side of said light receiving and transmitting means and aligned therewith along an axis corresponding to said predetermined direction for directing light from said predetermined direction without parallax to the receptor to which said support means is mounted.
Dependencies are inferred from the claim text.