Two-source illumination system

Details Two-source illumination system Two-source illumination system

1993-08-09

1995-01-31

Groody, James J.

Television

Video display

Projection device

348755, 359230, 359223, 359855, H04N 931

Patent

active

053862503

ABSTRACT:
A two-source illumination system includes a reflective array of elements deflectable to first and second positions in response to a drive voltage, and two sources pointed at the array from different angles, so that upon cycling the elements rapidly back and forth between the two positions, and alternately cycling the sources between on and off conditions synchronously with the cycling of the reflective array, light from both sources is (alternately) reflected back along an axis normal to the array. This arrangement allows driving the sources at a higher power level, resulting in a higher total light output from the system than would be possible with a single source driven constantly at a lower power level.

REFERENCES:
patent: 4638309 (1987-01-01), Granville
patent: 4680579 (1987-07-01), Granville
patent: 4879602 (1989-11-01), Glenn
patent: 4969730 (1990-11-01), van den Brandt
patent: 5096279 (1992-03-01), Hornbeck et al.
patent: 5097544 (1992-03-01), Barabas
patent: 5212555 (1993-05-01), Stoltz
Philips Technical Review, vol. 21, 1969/60, No. 3, pp. 73-108.
Ser. No. 991,216 filed Dec. 16, 1992 (Attorney's Docket No PHA 21,770).
Ser. No. 927,782, filed Aug. 10, 1992 (Attorney's Docket No. PHA 21,648A).

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