Projection-type image display device

A lens shift mechanism 32 of the projection-type image display device 10 includes a horizontal movable base 60 for horizontally shifting a projection lens 31, a vertical movable base 70 for vertically shifting the projection lens 31, and a horizontal drive actuator 61 and a vertical drive actuator 7...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	Oshima, Hiroshi, Inui, Shinro, Ishijima, Eiki, Matsui, Nobuki
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 ELECTROGRAPHY HOLOGRAPHY OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHOTOGRAPHY PHYSICS
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Beschreibung
Zusammenfassung:	A lens shift mechanism 32 of the projection-type image display device 10 includes a horizontal movable base 60 for horizontally shifting a projection lens 31, a vertical movable base 70 for vertically shifting the projection lens 31, and a horizontal drive actuator 61 and a vertical drive actuator 71 for driving these bases 60, 70. Driving forces of these actuators 61, 71 are transmitted via respective lead screws 671 (751) and a pair of lead nuts 672, 672b (752, 752b) meshing with the lead screws to shift the bases 60, 70. A pair of lead nuts are installed with elastic bodies 672c (752c) applying a pressure such that the pair of lead nuts recede from or approach each other in the axial direction of the lead screw. In this configuration, a delay in the shift operation is removed by reducing a backlash in the lens movement.