Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1992-01-06
1992-11-10
Cooper, Jack
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
2523014R, 313467, 340794, 340795, 359 72, G02F 11335, G02F 1135, C09K 1164
Patent
active
051629305
ABSTRACT:
A far-red emitting phosphor for cathode ray tubes used in liquid crystal light valves comprises lithium aluminum (or gallium) oxide, activated with iron or chromium. Increasing the activator concentration from 0.005 mole (commercially available) to about 0.015 to 0.05 mole increases the phosphor efficiency by about 50% and reduces the decay time from 30 msec (for the commerically available material) to 19 msec. Reducing the particle size to an average of 4 .mu.m or less provides the requisite high resolution for the CRT application.
REFERENCES:
patent: 3857054 (1974-12-01), Lehmann et al.
patent: 4350604 (1982-09-01), Awazu et al.
patent: 4799050 (1989-01-01), Prince et al.
patent: 4925276 (1990-05-01), McMurray et al.
patent: 5009490 (1991-04-01), Kovuo et al.
patent: 5084777 (1992-01-01), Slobodin
Jones "J. of Electrochem. Soc.", vol. 95, No. 6, Jun. 1948 pp. 295-298.
Hesse Kenneth R.
Lemoine Mary A.
Sluzky Esther
Cooper Jack
Denson-Low Wanda K.
Gudmestad Terje
Hughes Aircraft Company
Walder Jeannette M.
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