Instrument cluster lens assembly and method of making

• US 6,239,925 B1
• Filed: 09/03/1999
• Issued: 05/29/2001
• Est. Priority Date: 09/03/1999
• Status: Expired due to Fees

• Current Assignee: Fraunhofer USA Inc. (Fraunhofer-Institut für Nachrichtentechnik HHI), Key Plastics L L C (Key Plastics)
• Original Assignee: Key Plastics L L C (Key Plastics)
• Inventors: Herfurth, Hans J., Mehta, Sandip R., Ardrey, Kenneth J.
• Primary Examiner(s): Sugarman, Scott J.
• Assistant Examiner(s): SEYRAFI, SAEED HMT
• Application Number:
  US09/390,594
• Time in Patent Office: 634 Days
• Field of Search: 359/819, 359/810, 359/811, 353/31, 353/34, 353/35, 156/73.1
• US Class Current: 359/819
• CPC Class Codes: G02B 3/06 with cylindrical or toric faces

Abstract

An instrument cluster lens assembly includes a lens having top and bottom surfaces and a mounting portion that is mounted on a base having at least one lens receiving portion. The lens mounting portion is laser welded to the lens receiving portion of the base to securely connect the lens to the base thereby forming the lens assembly for an instrument cluster. Preferably, the lens mounting portion is transparent to laser light and the lens receiving portion of the base is opaque to laser light. A method of forming the instrument cluster lens assembly is also disclosed.

Claims

1. A lens assembly for an instrument cluster comprising:

a lens having a top surface and a bottom surface and including a mounting portion;

a base having at least one lens receiving portion;

wherein said lens mounting portion is laser welded by a laser welding apparatus to said lens receiving portion to securely connect said lens to said base thereby forming the lens assembly for an instrument cluster and further wherein the welding apparatus does not physically contact the lens or the receiving portion during welding.

2. The lens assembly of claim 1, wherein said lens and said base are fabricated from different materials.

3. The lens assembly of claim 1, wherein said lens is generally transparent to laser light.

4. The lens assembly of claim 1, wherein said base is generally opaque to laser light.

5. The lens assembly of claim 1, wherein said lens includes an acrylic material.

6. The lens assembly of claim 1, wherein said base includes an ABS plastic material.

7. The lens assembly of claim 1, wherein said lens further includes a removable protective film on said top surface that is transparent to laser light for protecting said lens during shipping.

8. A method of forming a lens assembly for an instrument cluster comprising the steps of:

providing a lens having a mounting portion;

providing a base having a lens receiving portion;

aligning said mounting portion of said lens with said lens receiving portion of said base;

laser welding said lens to said base for secure attachment.

9. The method of claim 8, wherein said laser welding is performed by a diode laser.

10. The method of claim 8, wherein said laser is operated at a wavelength between approximately 800 to 1100 nanometers.

11. The method of claim 8, wherein said laser is operated at a wavelength between approximately 800 to 960 nanometers.

12. The method of claim 8, wherein said laser is operated at a wavelength less than approximately 960 nanometers.

13. A method of forming a lens assembly for an instrument cluster comprising the steps of:

providing a substantially planar lens made from flat sheet stock;

providing a base having a non-planar lens receiving portion;

aligning said lens relative to said non-planar lens receiving portion of said base;

pressing said lens against said base to form a generally non-planar lens; and

providing a laser welding apparatus and laser welding said non-planar lens to said base for secure attachment wherein the welding apparatus does not physically contact the lens or the receiving portion during welding.

14. The method of claim 13, further comprising removing a protective film on a bottom surface of said lens before pressing said lens against said base.

15. The method of claim 13, further comprising removing a protective film on a top surface of said lens just before installing said instrument cluster lens assembly in an instrument panel.

16. The method of claim 13, wherein said laser welding is performed by a diode laser.

17. The method of claim 13, wherein said laser is operated at a wavelength less than approximately 960 nanometers.

18. A method of forming a lens assembly for an instrument cluster comprising the steps of:

providing a pre-shaped, non-planar lens having a mounting portion;

providing a base having a lens receiving portion;

aligning said mounting portion of said lens with said lens receiving portion of said base;

providing a laser welding apparatus and laser welding said lens to said base for secure attachment wherein the welding apparatus does not physically contact the lens or the receiving portion during welding.

19. The method of claim 18, wherein said laser welding is performed by a diode laser.

20. The method of claim 18, wherein said laser is operated at a wavelength less than approximately 960 nanometers.