Optical filter, projection display, and method for manufacturing optical filter
AssigneeFujinon Sano Corporation
InventorYoshiji KAWAMURA
Life of this patent
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Abstract
An optical filter capable of removing an unnecessary component of incident light. The optical filter has a transparent body of a flat plate-like shape. A plurality of filtering layers, each that separate an unnecessary polarization component of incident light from a necessary polarization component, are formed within the transparent body in series and at uniform intervals with an angle inclination relative to the travel direction of incident light. A plurality of light-absorptive layers are formed within the transparent body in series and at uniform intervals between the filtering layers to absorb an unnecessary component reflected by the filtering layers.
Claims3
An optical filter capable of removing an unnecessary component of incident light, comprising:
- a plurality of filtering layers each configured to transmit a necessary component of incident light while reflecting an unnecessary component, said filtering layers provided in series and at uniform intervals within a transparent flat plate-like body with a predetermined inclination angle relative to a travel direction of incident light;
- and
- a plurality of light-absorptive deposition layer films having light absorbing properties and configured to absorb said unnecessary component of incident light reflected at said filtering layers, said light-absorptive deposition film layers each provided within said transparent plate-like body in series and at uniform intervals corresponding to each of said plurality of filtering layers;
- a plurality of reflective layers formed under each of said plurality of light-absorptive deposition layer films and configured to reflect a remainder of said unnecessary light permeating through each of said light-absorptive deposition film layers;
- said light-absorptive deposition layer films and said reflective layers being laminated with each other at the positions between every adjacent filtering layers.
Dependencies are inferred from the claim text.