Illumination – Illuminated scale or dial – Edge illuminated modifier or light rod/pipe
Patent
1991-10-16
1993-03-02
Husar, Stephen F.
Illumination
Illuminated scale or dial
Edge illuminated modifier or light rod/pipe
362 31, 362223, G01D 1128
Patent
active
051903652
ABSTRACT:
An improved backlighting system for electronic displays that require such backlighting is disclosed. The system comprises a fluorescent lamp with improved visible light generating means and a reflector means for channeling the light generated by the lamp into the electronic display. In particular, the lamp comprises, in a preferred embodiment, a cylindrical glass housing, sealed at both ends and containing a plasma which can be excited to generate short wavelength light. A strip of phosphorescent material is placed along the inside surface of the tube, the strip being relatively restricted in width, its width being partially determined by the thickness of the electronic display. A reflector surrounds the lamp and helps drive the light the lamp generates into the phosphor. The lamp is also comprised of a glass transparent to the frequencies of light generated by the plasma. By limiting the width of the florescent area to a strip, light efficiency (the ratio of light out of the display to the electrical power into the lamp) increases and power consumption is also reduced. Additionally, the incorporation of one of several types of light concentrators between the lamp and light guide can improve the light efficiency still further.
REFERENCES:
patent: 4729068 (1988-03-01), Ohe
patent: 5055978 (1991-10-01), Rogoff
Apple Computer Inc.
Husar Stephen F.
Penn Jonathan B.
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