Near field lens having reduced size

• US 20070086204A1
• Filed: 10/17/2005
• Published: 04/19/2007
• Est. Priority Date: 10/17/2005
• Status: Active Grant

• Current Assignee: Varroc Lighting Systems S.R.O. (Varroc Engineering Limited)
• Original Assignee: Visteon Global Technologies Incorporated (Visteon Corporation)
• Inventors: Chinniah, Jeyachandrabose, Erion, Jeffrey, Sayers, Edwin, Jones, Thomas, Fallahi, Amir
• Granted Patent: US 7,401,948 B2
• Time in Patent Office: Days
• US Class Current: 362/520
• CPC Class Codes: F21V 5/04 of lens shape
• CPC Class Codes: F21V 7/0091 using total internal reflection
• CPC Class Codes: F21W 2107/00 Use or application of lighting devices on or in particular types of vehicles
• CPC Class Codes: G02B 19/0028 refractive and reflective surfaces, e.g. non-imaging catadioptric systems
• CPC Class Codes: G02B 19/0061 the light source comprising a LED semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission H01L33/00
• CPC Class Codes: Y10S 362/80 Light emitting diode

Abstract

A near field lens for an automotive light assembly which has a reduced thickness. Generally, the near field lens includes a main body of light transmitting material. A pocket is formed in the main body for receiving light from a light source. The pocket is defined by an inner radially facing surface and an inner axially facing surface. The inner radially facing surface is structured to reduce the thickness of the lens.

Claims

1. A near field lens for an automotive light assembly having a light source, the lens directing light outwardly along a longitudinal axis, the lens comprising:

a main body of light transmitting material;

a pocket formed in the main body for receiving light from the light source, the pocket being defined by an inner radially facing surface and an inner axially surface;

the inner radially facing surface being curved and following a circular arc.

2. The near field lens of claim 1, wherein the inner radially facing surface is curved between an upstream point and a downstream point, and wherein a tangent of the curve at the downstream point is generally parallel to the longitudinal axis.

3. The near field lens of claim 1, wherein the entire inner radially facing surface is curved.

4. The near field lens of claim 1, wherein the radius of the circular arc is greater than or equal to half of a radial height of the main body.

5. The near field lens of claim 1, wherein the inner axially facing surface is curved, a slope of the curvature of the inner axially facing surface being greater than a slope of the curvature of the inner radially facing surface.

6. The near field lens of claim 1, wherein the inner axially facing surface is structured as a lens to focus light from the pocket downstream.

7. The near field lens of claim 1, wherein the main body has a ratio of thickness to height less than 0.60.

8. The near field lens of claim 1, wherein the main body has a ratio of thickness to height less than 0.55.

9. The near field lens of claim 1, wherein the main body includes an outer radially facing surface structured to collimate and redirect light longitudinally.

10. The near field lens of claim 9, wherein the inner radially facing surface refracts light from the pocket, the light in turn reflected by the outer radially facing surface.

11. The near field lens of claim 9, wherein the outer radially facing surface follows a numerically generated curve.

12. A near field lens for an automotive light assembly having a light source, the lens directing light outwardly along a longitudinal axis, the lens comprising:

a main body of optical transmitting material;

a pocket formed in the main body for receiving light from the light source, the pocket being defined by an inner radially facing surface and an inner axially surface;

the inner radially facing surface being curved between an upstream point and a downstream point, a tangent of the curve at the downstream point being generally parallel to the longitudinal axis.

13. The near field lens of claim 12, wherein the inner radially facing surface follows a circular arc.

14. The near field lens of claim 12, wherein the entire inner radially facing surface is curved.

15. The near field lens of claim 12, wherein the inner axially facing surface is curved, a slope of the curvature of the inner axially facing surface being greater than a slope of the curvature of the inner radially facing surface.

16. The near field lens of claim 12, wherein the main body has a ratio of thickness to height less than 0.60.

17. The near field lens of claim 12, wherein the main body has a ratio of thickness to height less than 0.55.

18. The near field lens of claim 12, wherein the main body includes an outer axially facing surface generally perpendicular to the longitudinal axis.

19. The near field lens of claim 12, wherein the main body includes an outer axially facing surface having a slanted portion that is angled relative to the longitudinal axis.

20. The near field lens of claim 12, wherein the main body includes an outer axially facing surface having a plurality of beam spreading pillows.

21. The near field lens of claim 12, wherein the downstream point is the radially innermost point of the inner radially facing surface.