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Outer suspension type lens shielding mask for projection apparatus
| Details |
Inventors: Yang, Chih Chung; Sun, Hsi Chih; Fan, Hua Wen;
Assignee: Coretronic Corporation (Miao-Li County, TW)
Primary Examiner: Koval; Melissa Jan
Assistant Examiner: Kong; Andrew
Attorney, Agent or Firm: Birch, Stewart, Kolasch & Birch, LLP
An outer suspension type lens shielding mask for a projection apparatus includes a sheet body and a holding element, in which a rectangular hole is opened in the sheet body. The sheet body is combined with the holding element together for being fixed on a projection apparatus. Another outer suspension type lens shielding mask has a base plate, in which a rectangular hole is opened in the middle part thereof, upper and lower adjustable plates, installed behind the base plate and an open rectangular notch is respectively disposed at the middle parts of the upper and the lower adjustable plates, and an adjustment mechanism, including a plurality of connecting elements connected to the base plate and the upper and the lower adjustable plates for adjusting the relative positions of the upper and the lower adjustable plates on the base plate. |
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DETAILED DESCRIPTION The main object of the present invention is to provide an outer suspension type lens shielding mask for a projection apparatus, capable of being mounted outside of a projection lens and being designed to a static optical grating or adjustable optical grating matching with every kind of different aspect ratio of projection picture.
Another object of the present invention is to provide an outer suspension type lens shielding mask for a projection apparatus, capable of reducing production cost by elevating the picture quality from the outside of the projection apparatus without changing the design of an optical engine.
Still another object of the present invention is to provide an outer suspension type lens shielding mask for a projection apparatus, capable of avoiding bad shadow outside of a picture caused from diffraction light so as to improve the quality of sight amusement.
For attaining to the objects mentioned above, an outer suspension type lens shielding mask for a projection apparatus according to the present invention comprises a sheet body and a holding element, in which a rectangular hole is opened in the sheet body and the sheet body is combined with the holding element together for being fixed on a projection apparatus.
Another outer suspension type lens shielding mask according to the present invention comprises a base plate, in which a rectangular hole is opened in the middle part thereof, upper and lower adjustable plates, installed behind the base plate and an open rectangular notch is respectively disposed at the middle parts of the upper and the lower adjustable plates, and an adjustment mechanism, consisting a plurality of connecting elements connected to the base plate and the upper and the lower adjustable plates for adjusting the relative positions of the upper and the lower adjustable plates on the base plate.
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Lighting 
