Dual focus flashlight

Patent metadata

Field	Value
Publication number	US-9964281-B2
Application number	US-201514685303-A
Country	US
Kind code	B2
Filing date	Apr 13, 2015
Priority date	Aug 1, 2014
Publication date	May 8, 2018
Grant date	May 8, 2018

Abstract

Disclosed are flashlights that optimize the light output and beam focus of both a flood beam and a spot beam. The disclosed flashlights include a housing member and a lens including a first focusing element adapted to shape a light beam into a spot beam and a second focusing element adapted to shape a light beam into a flood beam. A first LED is positioned to direct light through the first focusing element, and a second LED positioned to direct light through the second focusing element. The first LED has a smaller die than the second LED, and the distance between the first LED and the first focusing element is greater than the distance between the second LED and the second focusing element.

First claim

The invention claimed is:

1. A dual-focus flashlight comprising:
a housing member;
a lens having a geometric center point, wherein the lens comprises:
a first focusing element, wherein the first focusing element is adapted to shape a light beam into a spot beam, and wherein the first focusing element is spaced a first distance from the geometric center point of the lens; and
a second focusing element, wherein the second focusing element is adapted to shape a light beam into a flood beam, and wherein the second focusing element is spaced a second distance from the geometric center point of the lens;

a first LED positioned to direct light through the first focusing element;
a second LED positioned to direct light through the second focusing element;
a power source disposed within the housing member and adapted to provide power to the first and second LEDs; and
a control element configured to selectively provide power to the first LED, the second LED, or both the first and second LEDs, wherein the first LED has a smaller die than the second LED, and wherein the distance between the first LED and the first focusing element is greater than the distance between the second LED and the second focusing element.

2. The flashlight of claim 1 , wherein the first focusing element comprises a central focusing element and an annular ring portion extending from and surrounding the central focusing element.

3. The flashlight of claim 2 , wherein the central focusing element comprises a plano-convex, convex-concave, or meniscus lens.

4. The flashlight of claim 1 , wherein the second focusing element comprises a plano-convex, convex-concave, or meniscus lens.

5. The flashlight of claim 3 , wherein the second focusing element consists essentially of a plano-convex, convex-concave, or meniscus lens.

6. The flashlight of claim 2 , wherein the first focusing element further comprises a side wall extending from the central focusing element and configured to form a rear void for receiving at least a portion of the first LED.

7. The flashlight of claim 2 , wherein the second focusing element further comprises a side wall extending therefrom and configured to form a rear void for receiving at least a portion of the second LED.

8. The flashlight of claim 6 , wherein the second focusing element further comprises a side wall extending therefrom and configured to form a rear void for receiving at least a portion of the second LED.

9. The flashlight of claim 1 , wherein the flashlight further comprises a base member to which the first and second LEDs are mounted.

10. The flashlight of claim 9 , wherein the base member comprises a first pedestal configured to position the first LED in a position relative to the first focusing member, and wherein the position of the first LED is selected to generate an optimal spot beam.

11. The flashlight of claim 9 , wherein the base member comprises a second pedestal configured to position the second LED in a position relative to the second focusing member, and wherein the position of the second LED is selected to generate an optimal flood beam.

12. The flashlight of claim 10 , wherein the base member comprises a second pedestal configured to position the second LED in a position relative to the second focusing member, and wherein the position of the second LED is selected to generate an optimal flood beam.

13. The flashlight of claim 1 , wherein the first and second distances from the geometric center point of the lens are substantially the same.

14. The flashlight of claim 1 , wherein the first and second distances from the geometric center point of the lens are different.

15. The flashlight of claim 1 , wherein the control element is a switch.

16. The flashlight of claim 15 , wherein repeated activation of the switch causes the flashlight to change modes, and wherein a first mode causes only the first LED to be activated and a second mode causes only the second LED to be activated.

17. The flashlight of claim 16 , wherein a third mode causes both the first and second LEDs to be activated.

18. The flashlight of claim 17 , wherein a fourth mode causes the flashlight to power off.

19. A dual-focus lens for a flashlight comprising:
a geometric center point;
a first focusing element, wherein the first focusing element is adapted to shape a light beam into a spot beam, and wherein the first focusing element is spaced a first distance from the geometric center point of the lens; and
a second focusing element, wherein the second focusing element is adapted to shape a light beam into a flood beam, and wherein the second focusing element is spaced a second distance from the geometric center point of the lens.

20. The flashlight of claim 19 , wherein the first focusing element comprises a central focusing element and an annular ring portion extending from and surrounding the central focusing element.

21. The flashlight of claim 20 , wherein the second focusing element comprises a plano-convex, convex-concave, or meniscus lens.

22. The flashlight of claim 20 , wherein the first focusing element further comprises a side wall extending from the central focusing element and configured to form a rear void for receiving at least a portion of a first LED.

23. The flashlight of claim 22 , wherein the second focusing element further comprises a side wall extending therefrom and configured to form a rear void for receiving at least a portion of a second LED.

Assignees

• Coast Cutlery Co

Inventors

• Windom Gregory David
• Choo Kam Fu
• Shi Hai Rong
• Ding Chao Jun
• Feng Shao Jian
• Leung Kin Pak

Classifications

• F21Y2115/10

  Light-emitting diodes [LED] · CPC title

• F21Y2113/13

  comprising an assembly of point-like light sources · CPC title

• F21L4/027

  the light sources being a LED · CPC title

• F21V5/006 Primary

  applied to portable lighting devices · CPC title

• F21V23/0414

  specially adapted to be used with portable lighting devices · CPC title