Diffusion plate
AssigneeCanon Kabushiki Kaisha
InventorsTakashi Suzuki, Kiyoshi Iizuka, Keiji Ohtaka, Hidemasa Mizutani
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Abstract
This application relates to a diffusion plate having microlens-like curved surfaces of a size of 10 to several tens of .mu.m arranged periodically in two dimensions on the surface of the substrate thereof. Curved surfaces are formed between the microlens-like curved surfaces. Further, irregularly arranged minute concave and/or convex surfaces are formed on the microlens-like curved surfaces.
Claims4
A diffusion plate having the following constructions formed on the surface of the substrate thereof:
- microlens-like curved surfaces of a size of the order of 10 to several tens of .mu.m arranged regularly and two-dimensionally;
- curved surfaces between said microlens-like curved surface;
- and
- minute concavo-convex surfaces irregularly arranged on said microlens-like curved surfaces.
A diffusion plate having the following constructions formed on the surface of the substrate thereof:
- microlens-like curved surfaces of a size of the order of 10 to several tens of .mu.m arranged regularly and two-dimensionally;
- curved surfaces between said microlens-like curved surfaces;
- and
- minute concavo-convex surfaces irregularly arranged on said microlens-like curved surfaces and on said curved surfaces.
Dependencies are inferred from the claim text.