Outer suspension type lens shielding mask for projection...

Details Outer suspension type lens shielding mask for projection... Outer suspension type lens shielding mask for projection...

2007-04-17

2007-04-17

Koval, Melissa Jan (Department: 2851)

Optics: image projectors

Light shield, mask, hood, or diaphragm

C353S122000, C353S088000

Reexamination Certificate

active

11453137

ABSTRACT:
An outer suspension type lens shielding mask for a projection apparatus including a sheet body and holding element, in which a rectangular hole is opened in the sheet body, and the sheet body is combined with the holding element to be fixed on a projection apparatus. Another outer suspension type lens shielding mask includes a base plate, in which a rectangular hole is opened in the middle part thereof, and upper and lower adjustable plates are installed behind the base plate. An open rectangular notch is respectively disposed at the middle parts of the upper and the lower adjustable plates. An adjustment mechanism includes a plurality of connecting elements connected to the base plate and the upper and the lower adjustable plates for adjusting the relative positions thereof, to avoid bad shadows yielded outside of a picture due to light diffraction and improve the quality of visual amusement.

REFERENCES:
patent: 2004/0021836 (2004-02-01), Hamada
patent: 2005/0030493 (2005-02-01), Wu
patent: 2005/0041222 (2005-02-01), Haba
Edward H. Stupp and Matthew S. Brennesholtz, Projection Displays, Copyright 1999 by John Wiley & Sons Ltd, ISBN 0-471-98253-9 (see p. 14, table 2.1).

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