Optical filter panel having a narrow-width selective-wavelength attenuation and high visible light transmission
View Patent ↗A molded optical filter and a method of molding an optical filter having a characteristic full-width half max value of less than at least 59 nm with a greatly increased visible light transmission value as compared to the prior art. The optical filter utilizes a sharp cut-on dye incorporated into a moldable polymer base matrix that allows the optical filter to be formed using conventional molding equipment as has been previously unknown in the art.
1. An optical filter having a maximum optical density, said optical filter comprising:
a formed transparent polymer base matrix material; and
an organic dye incorporated into said polymer base matrix, said organic dye filtering a predetermined band of infrared wavelengths, said filtered band having a full width of no more than 59 nm at half of said maximum optical density of said optical filter.
2. The optical filter of claim 1 , wherein said filtered band has a full width of no more than 37 nm at half of said maximum optical density of said optical filter.
3. The optical filter of claim 1 , wherein said filtered band has a full width of no more than 44 nm at half of said maximum optical density of said optical filter.
4. The optical filter of claim 1 , wherein said optical filter is selected from the group consisting of: lens blanks, lenses for eyewear, windows, lens shields and filtering plates.
5. The optical filter of claim 1 , wherein said polymer base matrix material is selected from the group consisting of: polycarbonate, nylon, urethane and acrylic.
6. The optical filter of claim 1 , wherein said organic dye is a sharp cut-on dye.
7. The optical filter of claim 1 , wherein said predetermined band of light is a laser emission.
8. The optical filter of claim 1 , wherein said transparent polymer base matrix material is formed using a method from the group consisting of: molding, casting and extruding.
9. The optical filter of claim 1 , wherein said predetermined band is centered at a wavelength of 812 nm.
10. The optical filter of claim 9 , wherein said filtered band has a full width of no more than 44 nm at half of said maximum optical density of said optical filter.
11. An optical filter having a maximum optical density, said optical filter comprising:
a formed transparent polymer base matrix material; and
an organic dye incorporated into said polymer base matrix, said organic dye filtering a predetermined band of infrared wavelengths, wherein said predetermined band is centered at a wavelength of 752 nm,
said filtered band having a full width of no more than 59 nm at half of said maximum optical density of said optical filter.
12. The optical filter of claim 11 , wherein said filtered band has a full width of no more than 37 nm at half of said maximum optical density of said optical filter.
13. A method of molding a selective wavelength optical filter comprising:
providing a polymer base matrix feedstock in the form of polymer pellets;
mixing a sharp cut-on organic dye with said polymer pellets;
melting said mixture of polymer pellets and dye; and
molding an optical filter wherein said organic dye filters a predetermined band of infrared wavelengths, said filtered band having a full width of no more than 59 nm at half of a maximum optical density of said optical filter.
14. The method of claim 13 , wherein said optical filter is selected from the group consisting of: lens blanks, lenses for eyewear, windows and filtering plates.
15. The method of claim 13 , wherein said polymer base matrix material is selected from the group consisting of: polycarbonate, nylon and acrylic.
16. A method of producing a polymer feedstock for use in molding an optical filter comprising:
providing a polymer base matrix in the form of polymer pellets;
mixing a sharp cut-on organic dye with said polymer pellets;
melting said mixture of polymer pellets and dye;
extruding said molten mixture; and
pelletizing said extrudate to form a polymer feedstock suitable for molding optical filters wherein said organic dye filters a predetermined band of infrared wavelengths, said filtered band having a full width of no more than 59 nm at half of a maximum optical density of said optical filter.
17. The method of claim 16 , wherein said polymer base matrix material is selected from the group consisting of: polycarbonate, nylon and acrylic.