
US Patent No: 4,869,575
Number of patents in Portfolio can not be more than 2000
Headwear-mounted periscopic display device
Stats
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Sep 26, 1989
Issued date -
Apr 1, 1988
filing date -
07/176,726
serial no -
Expired
status
Importance
Abstract
A periscopic display device for close-up viewing of a display. The device includes means for generating a display, such as an LED, LCD, or ELD display, and periscopic means consisting of a body of optically clear material having a reflecting prism portion and a collimating lens portion. The prism portion includes a first planar surface positioned adjacent to the display and at least one optically aligned reflecting surface for transmitting a reflected image of the display. The collimating lens portion consists of a convex lens having a focal point at the display and is positioned to receive the reflected image for focusing the image at optical infinity. Preferably the body includes a mounting portion in which the display generating means is embedded. The display device is lightweight, waterproof, dustproof, and is easily mounted on the eyeglass frames, visor, or headband of the wearer.
First Claim
Related Publications
International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
|---|---|---|---|
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| 4,722,601 Apparatus for determining the direction of a line of sight | 49 | 1984 | |
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| 4,753,514 Headwear-mounted periscopic display device | 60 | 1986 | |
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| 4,550,984 Head-mounted or helmet-mounted sighting device | 70 | 1983 | |