Liquid crystal video projector having lamp and cooling control a

Details Liquid crystal video projector having lamp and cooling control a Liquid crystal video projector having lamp and cooling control a

1991-12-23

1992-08-04

Groody, James J.

Facsimile and static presentation processing

Facsimile

Recording apparatus

315225, 352140, 353 57, 353 85, 353101, 3581941, H04N 574, G03B 2100

Patent

active

051363976

ABSTRACT:
A video projection system having a liquid crystal panel with a video image, a projection lamp with ON/OFF control, a zoom lens with a zoom control mechanism, a focusing lens with a focusing control mechanism, an audio system with a volume control, a projection-lamp light detector, a heat sensor, a variable-speed cooling fan, a control module having a microprocessor and a digital-to-analog converter, a display, a keypad, an alarm/annunciator, a power supply with ON/OFF control, and an infrared based remote control system able to control power ON/OFF, zoom, focus, picture, and sound volume.

REFERENCES:
patent: 4150887 (1979-04-01), Huber
patent: 4283658 (1981-08-01), Parker
patent: 4739396 (1988-04-01), Hyatt
patent: 4763044 (1988-08-01), Nuckolls et al.
patent: 4907873 (1990-03-01), Kuriyama
patent: 4925295 (1990-05-01), Ogawa et al.
patent: 4941036 (1990-07-01), Itoh
patent: 4951131 (1990-08-01), Lindahl
patent: 4964719 (1990-10-01), Tachikawa et al.
patent: 4988187 (1991-01-01), Kuriyama

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