Optical low-pass filter
AssigneeSeiko Epson Corporation
InventorsTakehiko Uehara, Kazuhiro Hara, Tadao Kojima
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Abstract
An optical low-pass filter includes: two birefringent plates; a phase plate made of a polymer film and bonded between the two birefringent plates through an adhesive layer or a tacky layer; and a sealing portion provided over an entire periphery of an external periphery surface of the optical low-pass filter.
Claims8
An optical low-pass filter comprising:
- two birefringent plates;
- a phase plate made of a polymer film and bonded between the two birefringent plates through an adhesive layer or a tacky layer;
- and
- a sealing portion provided over an entire periphery of an external periphery surface of the optical low-pass filter.
An optical low-pass filter in which between two birefringent plates a phase plate made of a polymer film is bonded through an adhesive layer or a tacky layer, wherein an entire periphery of an external periphery surface of the optical low-pass filter is processed with a water repelling agent.
Dependencies are inferred from the claim text.