Original Publication Date: 1993-Jul-01
Included in the Prior Art Database: 2005-Mar-19
This article discloses a new approach for a general-purpose audivisual headset.
discloses a new approach for a general-purpose
with an audivisual input and output may be built as a
light-weight device from miniaturized components. By means of an
electrical and/or fiberoptic cable, it may be connected to a separate
package containing the necessary processing equipment, data storage
or transmission units, and an electrical power supply.
combination with a pair of eyeglasses, a display path is
obtained which allows the user to see the display on the headset.
The center of gravity coincides with the center of the head. Both
headset and glasses may be rigidly attached to the head.
eyeglasses combine a convex outer surface with a
concave inner surface. The combined curvature defines the
diffractive power of the lens. For a given corrective power of the
eyeglass, one surface may be specifically selected. Normally, a
refractive power of + 4 diopter is chosen for aesthetic reasons.
The rear surface of an eyeglass may be used
in reflection to
generate a virtual image of a small display screen superimposed on
the normal transmitted image. A radius of curvature of some 10 cm
produces a virtual image at infinity from a screen close to the
user's temples at a distance of some 5 cm from the reflective
surface. Appropriate selection of the front surface of the eyeglass
allows sight correction. The display image is clearly focussed by
appropriately placing the complete headset. (The depth of focus is a
screen image size requires a display diameter of
about 0.5 inch. The screen axis should be at an a...