Headlight
A headlight of the type worn by medical and dental professionals includes a housing having an opening therein. A light source is positioned in the housing to output light through the opening. A singlet lens is mounted in the housing proximate the opening, and a doublet lens is disposed between the light source and the singlet lens.
1. A headlight of the type worn by medical and dental professionals, comprising:
a housing having an opening therein;
a light source positioned in the housing to output light through the opening, wherein the light source is a light emitting diode (LED);
a singlet lens mounted in the housing proximate the opening; and
an achromatic doublet lens including a meniscus lens in direct physical contact with a bi-convex lens disposed between the light source and the singlet lens, wherein the doublet lens and the singlet lens are arranged along a common axis, and wherein a diameter of the doublet lens is smaller than a diameter of the singlet lens.
2. The headlight of claim 1 , wherein the doublet lens has a diameter and the opening has a diameter, and wherein the diameter of the doublet lens is smaller than the diameter of the opening.
3. The headlight of claim 1 , wherein the singlet lens has a diameter of between about 10 mm and about 14 mm.
4. The headlight of claim 3 , wherein the singlet lens has a diameter of about 10 mm.
5. The headlight of claim 1 , wherein the singlet lens has a thickness of between about 1 mm and about 3 mm.
6. The headlight of claim 5 , wherein the singlet lens has a thickness of about 2 mm.
7. The headlight of claim 1 , wherein the doublet lens has a diameter of between about 3 mm and about 7 mm.
8. The headlight of claim 7 , wherein the doublet lens has a diameter of about 5 mm.
9. The headlight of claim 1 , wherein the doublet lens has a thickness of between about 2 mm and about 4 mm.
10. The headlight of claim 8 , wherein the doublet lens has a thickness of about 3 mm.
11. The headlight of claim 1 , wherein the opening has a diameter of between about 9 mm and about 14 mm.
12. The headlight of claim 1 , wherein the doublet lens is positioned proximate the light source.
13. The headlight of claim 1 , wherein the doublet lens is positioned distally from the opening.
14. The headlight of claim 1 , wherein the housing is configured for attachment to at least one of glasses or loupes.
15. The headlight of claim 1 , wherein the light source, singlet lens, and doublet lens are configured such that light projected from the light source through the doublet lens and singlet lens provides uniform surface illumination.
16. The headlight of claim 1 , wherein the LED is attached to a circuit board positioned within the housing.
17. The headlight of claim 1 , further comprising a through-the-lens (TTL) clip configured for attachment to at least one of glasses or loupes.
18. The headlight of claim 17 , wherein the housing is pivotably coupled to the TTL clip.
19. The headlight of claim 1 , further comprising an insert secured to the housing to hold the doublet lens in position.
20. The headlight of claim 1 , further comprising a second housing threadably coupled to the housing.
21. The headlight of claim 20 , further comprising a yoke, wherein the second housing includes a fastening portion including an eyelet for receiving a pin for pivotally attaching the second housing to the yoke.
22. The headlight of claim 21 , wherein the fastening portion further includes first and second tabs configured to engage with the yoke to provide first and second positive stops to pivotal movement of the second housing relative to the yoke.
23. The headlight of claim 20 , wherein the second housing includes first and second passageways, and wherein the first passageway is configured to house a portion of a power cable for supplying power to the LED and the second passageway is configured to receive a set screw for engaging the power cable.