Projection screen
OwnerKen Ohmata, Hideya Aoki +1inventors
InventorsKen Ohmata, Hideya Aoki, Naoyuki Tamura
Life of this patent
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Abstract
A projection screen comprises a metal plate member having substantially independent short raised ridges uniformly over the surface. In a process for treating the surface of a metal plate member, a metal plate member and a rough surface contacting the surface of the metal plate member are moved along respective axes intersecting at a certain angle to form raised ridges of typically 100 microns or less in length.
Claims12
A projection screen having a surface formed by a metal plate member having a plurality of raised ridges which are substantially unidirectional with a ridge density of about 10.sup.3 to 10.sup.9 ridges per cm.sup.2, said ridges each being formed by two side surfaces sloping towards one another and having a maximum width of about 0.5 to 50 microns;
- said ridges each having a length of approximately 100 microns or less, said projection screen further including a plurality of surface irregularities formed by crater patterns;
- said projection screen further including an outer coating of the oxide of the metal forming the plate member.
A projection screen having a surface formed by a metal plate member having a plurality of raised ridges which are substantially unidirectional with a ridge density of about 10.sup.3 to 10.sup.9 ridges per cm.sup.2, said ridges each being formed by two side surfaces sloping towards one another and having a maximum width of about 0.5 to 50 microns;
- said projection screen further including a plurality of surface irregularities formed by crater patterns;
- said projection screen further including an outer coating of the oxide of the metal forming the plate member, said plurality of raised ridges each having a length of approximately 100 microns or less, discontinuous and formed by abrading said plate member with an abrasive member moving reciprocally relative said plate member in two directions simultaneously.
Dependencies are inferred from the claim text.