Flashlight with lens for transmitting central and off-axis light sources

• US 7,083,297 B2
• Filed: 12/09/2003
• Issued: 08/01/2006
• Est. Priority Date: 12/09/2003
• Status: Active Grant

• Current Assignee: SureFire LLC (Surefire Holdings LLC)
• Original Assignee: SureFire LLC (Surefire Holdings LLC)
• Inventors: Kim, Paul Y., Matthews, John W.
• Primary Examiner(s): O'Shea, Sandra
• Assistant Examiner(s): Ton, Anabel
• Application Number:
  US10/732,874
• Publication Number:
  US 20050122711A1
• Time in Patent Office: 966 Days
• Field of Search: 362/184, 362/183, 362/244, 362/235, 362/545
• US Class Current: 362/184
• CPC Class Codes: F21L 4/027 the light sources being a LED
• CPC Class Codes: F21V 5/006 applied to portable lighting devices
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21Y 2113/20 of different form
• CPC Class Codes: F21Y 2115/10 Light-emitting diodes [LED]

Abstract

A flashlight has a lens having an optical axis, with a first light source positioned on the optical axis. A second light source is spaced apart from the first light source away from the optical axis, and the lens has an aperture registered with the second light source. The lens may have a central portion configured to transmit axially-emitted light from the first light source, and the lens having a peripheral portion having an internally reflective surface configured to reflect laterally-emitted light from the light source in a direction more closely aligned with the optical axis. The first light source may be positioned within a recess in the lens, and the aperture may be formed in the peripheral portion of the lens. The light sources may be LEDs, and may be of different colors.

Claims

1. A flashlight comprising:

a lens having a curved refracting surface defining an optical axis;

a first light source positioned on the optical axis;

a second light source spaced apart from the first light source away from the optical axis; and

the lens defining an aperture registered with the second light source.

2. The flashlight of claim 1 wherein the lens defines a recess receiving the first light source, and wherein the aperture is located away from the recess.

3. The flashlight of claim 1 wherein a portion of the lens intervenes between the first and second light sources.

4. The flashlight of claim 1 wherein the first light source emits at least some light in a direction toward the second light source, and wherein a portion of the lens intercepts and internally reflects the at least some light and redirects it generally along the optical axis.

5. The flashlight of claim 1 wherein the first light source is an LED.

6. The flashlight of claim 1 wherein the first and second light sources emit light of different colors.

7. The flashlight of claim 1 wherein the aperture is a cylindrical bore.

8. The flashlight of claim 1 wherein the aperture is parallel to the optical axis.

9. The flashlight of claim 1 wherein the lens has a central portion configured to transmit axially-emitted light from the first light source, and the lens having a peripheral portion having an internally reflective surface configured to reflect laterally-emitted light from the light source in a direction more closely aligned with the optical axis.

10. The flashlight of claim 9 wherein the aperture is defined in the peripheral portion of the lens.

11. The flashlight of claim 2 wherein the recess has a rim positioned at a selected radial distance from the optical axis, and wherein the aperture is positioned radially beyond the selected distance.

12. A flashlight comprising:

a lens having a curved refracting surface defining an optical axis;

a first light source positioned on the optical axis;

a second light source spaced apart from the first light source away from the optical axis;

the lens having a light-transmissive portion directly intervening between the first and second light sources; and

wherein the light-transmissive portion has a lens surface portion angled at a sufficient angle with respect to light rays emitted from the first source, such that the light rays are internally reflected at the lens surface portion.

13. A flashlight comprising:

a lens having a curved refracting surface defining an optical axis;

a first light source positioned on the optical axis;

a second light source spaced apart from the first light source away from the optical axis;

the lens having a light-transmissive portion directly intervening between the first and second light sources; and

wherein the lens includes a transmission path for the second light source parallel to the optical axis.

14. The flashlight of claim 13 wherein the transmission path is a passage defined in the lens.

15. A flashlight comprising:

a lens having a curved refracting surface defining an optical axis;

a first light source positioned on the optical axis;

a second light source spaced apart from the first light source away from the optical axis;

the lens having a light-transmissive portion directly intervening between the first and second light sources; and

wherein the lens has a central portion configured to transmit axially-emitted light from the first light source, and wherein an aperture is defined in a peripheral portion of the lens away from the central portion.

16. The flashlight of claim 15 wherein the lens defines a recess receiving the first light source, and wherein the aperture is located away from the recess.

17. A flashlight comprising:

a lens having a curved refracting surface defining an optical axis;

a first light source positioned on the optical axis;

a second light source spaced apart from the first light source away from the optical axis;

the lens having a light-transmissive portion directly intervening between the first and second light sources; and

wherein the first light source emits at least some light in a direction toward the second light source, and wherein a portion of the lens intercepts and internally reflects the at least some light and redirects it generally along the optical axis.