FOCUSING DEVICE OF COLOR PROJECTOR

PROBLEM TO BE SOLVED: To adjust focusing with high precision over the whole projection area on a screen. SOLUTION: An all white image with maximum luminance is displayed on a color liquid crystal display unit 2 and projected on the screen 4. A color TV camera 5 picks up the image of the whole projec...

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Bibliographische Detailangaben
Hauptverfasser:	HAYAZAKI YASUSHI, MATSUMURA KENICHI, KATSUNO YUJI
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES THEREFOR APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM CINEMATOGRAPHY DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY ELECTROGRAPHY FREQUENCY-CHANGING HOLOGRAPHY NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PHOTOGRAPHY PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To adjust focusing with high precision over the whole projection area on a screen. SOLUTION: An all white image with maximum luminance is displayed on a color liquid crystal display unit 2 and projected on the screen 4. A color TV camera 5 picks up the image of the whole projection screen and stores R, G, and B signals in a video memory 6. A dispersion calculation part 7 reads the R, G, and B signals out as to focusing confirmation areas previously set by the center part and peripheral part of the projection screen and calculates dispersion values Rv, Gv, and Bv showing the distribution states of signal levels by image pickup pixels. A liquid crystal angle adjustment part 8 adjusts the angle (swing and tilt) of the liquid crystal surface of the color liquid crystal display unit 2 to the optical axis. A lens position adjustment part 9 moves a projection lens 3 along the optical axis to adjust its focus. A focusing control part 10 controls the liquid crystal angle adjustment part 8 and lens position adjustment part 9 as to the dispersion values Rv, Gv, and Bv of a focusing confirmation area respectively to put the lens in focus uniformly over the entire projection screen.