Lens for safety glasses
In a lens for safety glasses of the present invention, a first lens element which shields a laser beam is laid on a second lens element for antiglare. The first and the second lens element may be affixed together. In the lens for safety glasses, the first lens element includes a substrate which contains an absorbent for selectively absorbing a laser beam having a specific wavelength in an ultraviolet wavelength region, a visible light wavelength region or an infrared wavelength legion and is transparent in the visible light wavelength region. The safety glasses with the lens may provide comfortable fit and a good appearance, causes less misjudgment of colors and prevents loss of correct color sense, and has both a laser-beam shielding function and an antiglare function.
1. A lens for safety glasses comprising a first lens element for shielding a laser beam and a second lens element for antiglare which is laid on the first lens element;
wherein the first lens element comprises a substrate which contains an absorbent for selectively absorbing a laser beam having a specific wavelength in one of an ultraviolet wavelength region, a visible light wavelength region, and an infrared wavelength region, and the substrate is transparent in the visible light wavelength region.
2. The lens for safety glasses according to claim 1 , wherein the second lens element comprises one of a polarizing lens including one polarizer, a polarizing lens including one polarizer and one protection resin sheet, and a polarizing lens including one polarizer and two protection resin sheets having the one polarizer therebetween.
3. The lens for safety glasses according to claim 1 , wherein the first lens element has an optical density of Log ε=2.0 or more in the specific wavelength of the laser beam, wherein εis an inverse transmittance of the first lens element.
4. The lens for safety glasses according to claim 1 , wherein a hue of the first lens element and a hue of the second lens element are complementary to each other in color.
5. The lens for safety glasses according to claim 4 , wherein at least one of the hue of the first lens element and the hue of the second lens element is provided by a pigment.
6. The lens for safety glasses according to claim 1 , wherein shielding the laser beam comprises reducing a transmittance of the laser beam.
7. The lens for safety glasses according to claim 6 , wherein reducing the transmittance comprises providing a transmittance of 20% to 50% of the laser beam.
8. A lens for safety glasses comprising a first lens element for shielding a laser beam and a second lens element for antiglare which is affixed to the first lens element;
wherein the first lens element comprises a substrate which contains an absorbent for selectively absorbing a laser beam having a specific wavelength in one of an ultraviolet wavelength region, a visible light wavelength region and an infrared wavelength region, and the substrate is transparent in the visible light wavelength region.
9. The lens for safety glasses according to claim 8 , wherein the first lens element and the second lens element are affixed by thermal fusion.
10. The lens for safety glasses according to claim 8 , wherein the first lens element and the second lens element are affixed by one of an adhesive and a glue.
11. The lens for safety glasses according to claim 8 , wherein the first lens element and the second lens element are affixed through injection molding.
12. The lens for safety glasses according to claim 8 , wherein the second lens element comprises one of a polarizing lens including one polarizer, a polarizing lens including one polarizer and one protection resin sheet, and a polarizing lens including one polarizer and two protection resin sheets having the one polarizer there between.
13. The lens for safety glasses according to claim 8 , wherein a hue of the first lens element and a hue of the second lens element are complementary to each other in color.
14. The lens for safety glasses according to claim 8 , wherein the first lens element has an optical density of Log ε=2.0 or more in the specific wavelength of the laser beam, wherein εis an inverse transmittance of the first lens element.
15. The lens for safety glasses according to claim 8 , wherein shielding the laser beam comprises reducing a transmittance of the laser beam.
16. The lens for safety glasses according to claim 15 , wherein reducing the transmittance comprises providing a transmittance of 20% to 50% of the laser beam.