The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 05, 2020
Filed:
May. 19, 2015
Maxell, Ltd., Kyoto, JP;
Eiki Ishijima, Hitachi, JP;
Shinro Inui, Oyamazaki, JP;
Hiroshi Oshima, Hitachi, JP;
Nobuki Matsui, Hitachi, JP;
MAXELL, LTD., Kyoto, JP;
Abstract
A lens shift mechanismof the projection-type image display deviceincludes a horizontal movable basefor horizontally shifting a projection lens, a vertical movable basefor vertically shifting the projection lens, and a horizontal drive actuatorand a vertical drive actuatorfor driving these bases. Driving forces of these actuatorsare transmitted via respective lead screws() and a pair of lead nuts() meshing with the lead screws to shift the bases. A pair of lead nuts are installed with elastic bodies() 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.