Optical: systems and elements – Lens – With field curvature shaping
Reexamination Certificate
2006-07-24
2008-03-11
Harrington, Alicia M (Department: 2873)
Optical: systems and elements
Lens
With field curvature shaping
C359S784000, C359S716000
Reexamination Certificate
active
07342723
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: |F1/F|≧4.5 (Condition (1)); 2.5≦|F2/F|≦6.0 (Condition (2)); 3.8≦|F3/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.
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Stupp, E.H., & Brennensholtz, M.S.;Projection Displays; John Wiley & Sons Ltd. (1999); pp. 146-150 and 205-208.
Hughes Patricia M.
Lu Kai Chang
Rodriguez, Jr. Ernesto M.
3M Innovative Properties Company
Harrington Alicia M
Rosenblatt Gregg H.
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