Goggle lens, method of manufacturing same, and goggle containing same
A goggle lens comprises a first surface ( 210 ) and a second surface ( 220 ) separated by a thickness ( 230, 240 ) of the goggle lens. The goggle lens is made up of a central region ( 121 ), a first lateral region ( 122 ) on a first side of the central region, and a second lateral region ( 123 ) on an opposite side of the central region. The first surface of the goggle lens is a portion of a first ellipse ( 211 ) and the second surface of the goggle lens is a portion of a second ellipse ( 221 ). The goggle lens complies with at least one of a MIL-PRF-31013 standard, a EA-L-1381B standard, and a FNS/PD 86-20 standard, all of which define particular specifications for impact resistance.
1. A goggle lens comprising:
a first surface and a second surface separated by a thickness of the goggle lens, where the goggle lens is made up of:
a central region;
a first lateral region on a first side of the central region; and
a second lateral region on an opposite side of the central region, wherein:
the first surface is a portion of a first ellipse;
the second surface is a portion of a second ellipse; and
the goggle lens complies with an impact resistance requirement of at least one of a MIL-PRF-31013 standard, a EA-L-1381B standard, and a FNS/PD 86-20 standard.
2. The goggle lens of claim 1 wherein:
the first ellipse and the second ellipse have eccentricities that are between 0.85 and 0.90.
3. The goggle lens of claim 1 wherein:
the first ellipse has an eccentricity of approximately 0.863; and
the second ellipse has an eccentricity of approximately 0.858.
4. The goggle lens of claim 1 wherein:
an arc length of the first ellipse is at least 18 centimeters.
5. The goggle lens of claim 4 wherein:
the arc length of the first ellipse is approximately 18.7 centimeters; and
an arc length of the second ellipse is approximately 19.1 centimeters.
6. The goggle lens of claim 1 wherein:
the first lateral region terminates at a first terminus and the second lateral region terminates at a second terminus;
a midpoint of the second ellipse lies in a first plane;
a line passing through the first terminus and the second terminus lies in a second plane that is parallel to the first plane; and
the first plane and the second plane are separated from each other by a separation distance.
7. The goggle lens of claim 6 wherein:
the separation distance is at least 4 centimeters.
8. The goggle lens of claim 7 wherein:
the separation distance is approximately 4.4 centimeters.
9. The goggle lens of claim 1 wherein:
the thickness of the goggle lens varies across a length of the goggle lens.
10. The goggle lens of claim 9 wherein:
the thickness of the goggle lens at the central region is approximately 0.25 centimeters; and
the thickness of the goggle lens at the first and second lateral regions is approximately 0.20 centimeters.
11. The goggle lens of claim 1 further comprising:
a cutout capable of accommodating a user's nose.
12. The goggle lens of claim 11 wherein:
a greatest height of the goggle lens is approximately 7 centimeters; and
a smallest height of the goggle lens is approximately 3.6 centimeters.
13. The goggle lens of claim 1 wherein:
the goggle lens further comprises an attachment mechanism for attaching the goggle lens to a goggle frame.
14. The goggle lens of claim 13 wherein:
the attachment mechanism comprises a plurality of notches cut into a perimeter of the goggle lens.
15. The goggle lens of claim 14 wherein:
the goggle lens further comprises a cutout capable of accommodating a user's nose; and
the plurality of notches includes at least one notch cut into the perimeter of the goggle lens adjacent to the cutout.
16. The goggle lens of claim 1 wherein:
the goggle lens comprises a polycarbonate material.
17. The goggle lens of claim 1 wherein:
the first lateral region and the second lateral region are characterized by a negative optical power.
18. A goggle comprising:
a frame capable of being secured about a user's face; and
a goggle lens comprising:
a first surface and a second surface separated by a thickness of the goggle lens, where the goggle lens is made up of:
a central region;
a first lateral region on a first side of the central region; and
a second lateral region on an opposite side of the central region, wherein:
the first surface is a portion of a first ellipse;
the second surface is a portion of a second ellipse; and
the goggle lens complies with a ballistic resistance requirement of at least one of a MIL-PRF-31013 standard, a EA-L-1381B standard, and a FNS/PD 86-20 standard.
19. The goggle of claim 18 wherein:
the first ellipse has an eccentricity of approximately 0.863 and an arc length of approximately 18.7 centimeters;
the second ellipse has an eccentricity of approximately 0.858 and an arc length of approximately 19.1 centimeters;
the thickness of the goggle lens at the central region is approximately 0.25 centimeters; and
the thickness of the goggle lens at the first and second lateral regions is approximately 0.20 centimeters.
20. The goggle of claim 19 wherein:
the first lateral region terminates at a first terminus and the second lateral region terminates at a second terminus;
a midpoint of the second ellipse lies in a first plane;
a line passing through the first terminus and the second terminus lies in a second plane that is parallel to the first plane; and
the first plane and the second plane are separated from each other by a separation distance that is approximately 4.4 centimeters.
21. A method of manufacturing a goggle lens for a goggle, the method comprising:
identifying a first ellipse;
identifying a second ellipse; and
molding the goggle lens such that:
an inner surface of the goggle lens conforms substantially to the first ellipse;
an outer surface of the goggle lens conforms substantially to the second ellipse; and
the goggle lens complies with an impact resistance requirement of at least one of a MIL-PRF-31013 standard, a EA-L-1381B standard, and a FNS/PD 86-20 standard.
22. The method of claim 21 wherein:
identifying the first ellipse comprises identifying an ellipse having an eccentricity of approximately 0.863; and
identifying the second ellipse comprises identifying an ellipse having an eccentricity of approximately 0.858.
23. The method of claim 21 wherein:
molding the goggle lens further comprises tapering the goggle lens such that a center of the goggle lens is thicker than a lateral region of the goggle lens.
24. The goggle lens of claim 17 wherein:
the central region is devoid of a negative optical power.
25. The goggle lens of claim 18 wherein:
the first lateral region and the second lateral region are characterized by a negative optical power.
26. The goggle lens of claim 25 wherein:
the central region is devoid of a negative optical power.
27. The method of claim 21 wherein:
molding the goggle lens comprises:
incorporating a negative optical power for a first lateral region and a second lateral region of the goggle lens.
28. The method of claim 27 wherein:
molding the goggle lens further comprises:
providing a zero optical power for a central region of the goggle lens located between the first and second lateral regions of the goggle lens.