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:
Mar. 11, 2008
Filed:
Jul. 24, 2006
Ernesto M. Rodriguez, Jr., Austin, TX (US);
Patricia M. Hughes, Round Rock, TX (US);
Kai Chang LU, Birmingham, GB;
Ernesto M. Rodriguez, Jr., Austin, TX (US);
Patricia M. Hughes, Round Rock, TX (US);
Kai Chang Lu, Birmingham, GB;
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A portable projection device comprises a housing, a handle, and an optical engine. The optical engine comprises an illumination source, an imaging system, and a wide angle projection lens that includes a first lens group of negative refractive power, the first lens group having at least one aspheric surface, a second lens group, and a third lens group of positive refractive power. For the wide angle projection lens, the following Conditions (1) to (4) are satisfied: |F/F|≧4.5 (Condition (1)); 2.5≦|F/F|≦6.0 (Condition (2)); 3.8≦|F/F|≦5.0 (Condition (3)); and 0.8≦BFL/F≦1.4 (Condition (4)). The portable projection device can be implemented as a personal gaming system and can also be configured as a portable, fully integrated video gaming system that allows gamers to plug in and play at nearly any location, with only a wall or other viewing surface being used to view the projected image.