Kaiser Optical Systems Inc.

Other

General Scientific Corporation

B Jin Chang

Head-mounted LED light

A filter accessory is disclosed for use with a pair of eyeglasses. The accessory includes a filter lens of the type that substantially prevents the passage of light of a predetermined wavelength and means for mounting the filter lens inside the eyeglass lenses, wherein, in the preferred embodiment, engagement is made with nose pieces provided on the eyeglass frames.

Eye protection accessory

Binoculars

The present invention is a manner of constructing holographic optical elements for use in laser eye protection. A photosensitive layer, preferably formed of dichromated gelatin, is disposed on a transparent supporting substrate with a reflecting surface conformal to the outer surface of the photosensitive layer. The photosensitive layer is exposed with light from a laser point source. The photosensitive layer records the interference patterns between light incident directly from the laser point source and light reflected from the reflecting surface. The photosensitive layer is developed to form a holographic optical element. When this holographic optical element is disposed before the eye, with the center of the eye located at a point equivalent to the location of the laser point source, laser light directed toward the center of the eye is diffracted by the holographic optical element and effectively reflected away from the eye. Construction of the holographic optical element in this manner enables the use of a flatter spectacle lens while minimizing flare. The blocking angles at any particular portion of the holographic optical element can be reduced, thus increasing the transmissibility of the eyewear, without sacrificing protection. This technique also prevents the holographic optical element from being retroflective at all angles, thereby presenting a noncooperative target cross section to illuminating lasers. 1

Holographic filter construction for protective eyewear

The present invention is a technique for fabrication of a holographic optical element combiner having a high diffraction efficiency at a central portion and gradually decreasing diffraction efficiencies for peripheral portions at locations further from the central portion. The holographic optical element combiner is constructed by exposing a photosensitive material and either selectively diffusing the construction beam with moving diffuser plate or plates or selectively blocking the construction beam with opaque plate or plates. The peripheral portions are directly exposed for a gradually decreasing fraction of the exposure time for locations further from the central portion. The preferred embodiment employs diffuser plate or plates in order to achieve the same exposure bias level throughout the photosensitive material. When a holographic optical element combiner of this construction is employed in a head up display, the visibility of the edge of the combiner is reduced. In the preferred embodiment the holographic optical element combiner is embedded in a windshield glass structure.

Growing community of inventors

Ann Arbor, MI, United States of America

B Jin Chang