Screen for a projector

• US 5,414,558 A
• Filed: 02/14/1994
• Issued: 05/09/1995
• Est. Priority Date: 02/14/1994
• Status: Expired due to Fees

• Current Assignee: Shy-Loong You
• Original Assignee: Shy-Loong You
• Inventors: You, Shy-Loong
• Primary Examiner(s): Wintercorn, Richard A.
• Application Number:
  US08/195,641
• Time in Patent Office: 449 Days
• Field of Search: 359/443, 359/451, 359/459
• US Class Current: 359/451
• CPC Class Codes: G03B 21/60 characterised by the nature of the surface

Abstract

A screen is used for a projector and includes a metal plate body and a plurality of elongated parallel streaks. The metal plate body has a concave reflection surface which is horizontally straight and vertically curved and which has a predetermined radius of curvature. The streaks protrude uniformly and densely from the reflection surface of the metal plate body and extend from the top end of the reflection surface to the bottom end of the reflection surface in a generally vertical direction. Any adjacent pair of the streaks are sized and spaced apart from each other at an interval of less than 5 microns so that the streaks function as a concave grating. The concave reflection surface is coated with a transparent film by immersing the metal plate body in a caustic solution so as to decrease interference from light sources other than the projector. Accordingly, when the screen is in use, the light emitted from the projector can form high contrast images on the concave reflection surface so as to provide a high image quality on the screen.

Claims

1. A screen for a projector, said screen being used for reflecting light emitted from said projector and comprising:

a metal plate body having a concave reflection surface which is horizontally straight and vertically curved and which has a predetermined radius of curvature; and

a plurality of elongated parallel streaks protruding uniformly from said reflection surface and extending from a top end of said reflection surface to a bottom end of said reflection surface in a generally vertical direction, any adjacent pair of said streaks being arranged and spaced apart from each other at a distance so that said streaks function as a concave grating, said concave reflection surface being coated with a transparent film by immersing said metal plate body in a caustic solution so as to decrease interference from light sources other than said projector;

whereby, when said screen is in use, said light emitted from said projector can form high contrast images on said concave reflection surface.

2. A screen as claimed in claim 1, wherein each adjacent pair of said streaks are spaced apart by an interval of less than 5 microns.

3. A screen as claimed in claim 1, wherein said metal plate body is made of aluminum.