Vehicular camera with adhesively bonded construction

Patent metadata

Field	Value
Publication number	US-10674053-B2
Application number	US-201916571633-A
Country	US
Kind code	B2
Filing date	Sep 16, 2019
Priority date	Nov 7, 2013
Publication date	Jun 2, 2020
Grant date	Jun 2, 2020

Abstract

A vehicular camera includes a lens accommodated in a lens barrel, a lens holder that accommodates at least part of the lens holder, and a printed circuit board with an imager disposed thereat. After the lens is optically aligned with the imager, the adhesive is initially curable to an initially-cured state in an initial curing process for an initial-cure time period. The initially-cured adhesive is further curable to a further-cured state in a secondary curing process for a further-cure time period that is longer than the initial-cure time period. As further cured, the further-cured adhesive maintains optical alignment of the lens with the imager for use of the vehicular camera in a vehicle. The further-cured adhesive maintains at least 70% strength of bond after being exposed for 1000 hours to a temperature of 85 degrees Celsius and a humidity of 85% RH.

First claim

The invention claimed is:

1. A vehicular camera, said vehicular camera comprising:
a lens comprising a plurality of optical elements, wherein the lens is accommodated in a lens barrel, and wherein the lens barrel comprises a cylindrical portion;
a lens holder comprising a cylindrical passageway that accommodates at least a portion of the cylindrical portion of the lens barrel;
a printed circuit board;
an imager disposed at the printed circuit board;
a flexible electrical ribbon cable with one end electrically connecting at the printed circuit board and with another distal end electrically terminating at an electrical connector of the flexible electrical ribbon cable;
wherein said vehicular camera utilizes an adhesive to hold the lens optically aligned with the imager;
wherein the adhesive is initially curable in an initial radiation curing process for an initial-cure time period of less than 10 seconds, and wherein the initially-cured adhesive is further curable to a further-cured strength in a secondary curing process;
wherein the adhesive is initially cured via the initial radiation curing process after the lens is optically aligned with the imager;
wherein the initially-cured adhesive, as cured via the initial radiation curing process, holds the lens optically aligned with the imager;
wherein, as further cured via the secondary curing process for a further-cure time period that is longer than the initial-cure time period, the further-cured adhesive maintains optical alignment of the lens with the imager for use of said vehicular camera in a vehicle;
wherein the adhesive, in its uncured state, comprises a one-part, filled adhesive; and
wherein the further-cured adhesive maintains at least 70% strength of bond after being exposed for 1000 hours to a temperature of 85 degrees Celsius and a humidity of 85% RH.

2. The vehicular camera of claim 1 , wherein the lens barrel is threadedly attached at the lens holder, and wherein, with the lens barrel threadedly attached at the lens holder, optical alignment of the lens relative to the imager is achieved.

3. The vehicular camera of claim 1 , wherein the lens barrel is adhesively attached at the lens holder, and wherein, with the lens barrel adhesively attached at the lens holder, optical alignment of the lens relative to the imager is achieved.

4. The vehicular camera of claim 1 , wherein the lens barrel is threadedly and adhesively attached at the lens holder, and wherein, with the lens barrel threadedly and adhesively attached at the lens holder, optical alignment of the lens relative to the imager is achieved.

5. The vehicular camera of claim 1 , wherein the printed circuit board is attached at the lens holder, and wherein, with the printed circuit board attached at the lens holder, optical alignment of the lens relative to the imager is achieved.

6. The vehicular camera of claim 1 , wherein the printed circuit board is mechanically attached at the lens holder, and wherein, with the printed circuit board mechanically attached at the lens holder, optical alignment of the lens relative to the imager is achieved.

7. The vehicular camera of claim 1 , wherein the printed circuit board is mechanically attached at the lens holder via at least one fastener, and wherein, with the printed circuit board mechanically attached at the lens holder via at least one fastener, optical alignment of the lens relative to the imager is achieved.

8. The vehicular camera of claim 1 , wherein the printed circuit board is mechanically attached at the lens holder via two screw fasteners, and wherein, with the printed circuit board mechanically attached at the lens holder via two screw fasteners, optical alignment of the lens relative to the imager is achieved.

9. The vehicular camera of claim 1 , wherein the further-cure time period is at least 30 seconds.

10. The vehicular camera of claim 1 , wherein the lens barrel comprises an annular flange that circumscribes and extends radially from the cylindrical portion of the lens holder.

11. The vehicular camera of claim 1 , wherein the adhesive, in its uncured state, has a viscosity at 23 degrees Celsius between 5,000 mPa and 150,000 mPa.

12. The vehicular camera of claim 1 , wherein the lens holder is adapted for attachment to a camera housing.

13. The vehicular camera of claim 1 , wherein lens resolution of the lens meets but does not exceed a resolution determined by size of a sensing surface of the imager.

14. The vehicular camera of claim 1 , wherein the lens omits achromatic lenses.

15. The vehicular camera of claim 1 , wherein the lens employs digital chromatic correction based on a predetermined chromatic aberration measurement.

16. The vehicular camera of claim 1 , wherein optical alignment of the lens relative to the imager is achieved robotically.

17. The vehicular camera of claim 1 , wherein the adhesive comprises one selected from the group consisting of (i) a Delo OB749 adhesive, (ii) a Delo AD VE 112203 adhesive and (iii) a Delo OB787 adhesive.

18. The vehicular camera of claim 1 , wherein said vehicular camera, when installed and used in the vehicle, captures image data for use by a rear vision system of the vehicle.

19. The vehicular camera of claim 1 , wherein the secondary curing process comprises thermal curing.

20. The vehicular camera of claim 1 , wherein the secondary curing process comprises moisture curing.

21. The vehicular camera of claim 1 , wherein the secondary curing process comprises radiation curing.

22. The vehicular camera of claim 1 , wherein said vehicular camera, when installed and used in the vehicle, captures image data for use by a forward vision system of the vehicle.

23. The vehicular camera of claim 1 , wherein said vehicular camera, when installed and used in the vehicle, captures image data for use by an automatic high-beam control of the vehicle.

24. The vehicular camera of claim 1 , wherein the adhesive bonds to PBT/PC and PBT plastics.

25. The vehicular camera of claim 1 , wherein the adhesive bonds to an FR4 PCB.

26. The vehicular camera of claim 1 , wherein the adhesive bonds to zinc.

27. The vehicular camera of claim 1 , wherein the adhesive bonds to aluminum.

28. The vehicular camera of claim 1 , wherein the adhesive, in its further-cured state, has a bond shear strength greater than 1,000 PSI.

29. The vehicular camera of claim 28 , wherein bond shear strength of the adhesive, in its further-cured state, reduces less than 60% at 85 degrees Celsius.

30. The vehicular camera of claim 28 , wherein the adhesive, in its further-cured state, has a glass transition temperature greater than 90 degrees Celsius.

31. The vehicular camera of claim 28 , wherein the adhesive, in its further-cured state, has greater than 50 Shore D hardness.

32. The vehicular camera of claim 28 , wherein the adhesive is halogen-free.

33. The vehicular camera of claim 1 , wherein the initial radiation curing process comprises exposure to UV light for the initial-cure time period.

34. The vehicular camera of claim 33 , wherein the initial-cure time period is less than 7 seconds.

35. A vehicular camera, said vehicular camera comprising:
a lens comprising a plurality of optical elements, wherein the lens is accommodated in a len

Assignees

• Magna Electronics Inc

Inventors

• Winden Brian J
• Devota Robert A
• Sesti Matthew C
• Stemmer Joseph A
• Byrne Steven V
• Garcia John R
• Olson David F

Classifications

• C09J5/00

  Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers · CPC title

• C09J2463/00

  Presence of epoxy resin · CPC title

• H04N5/2252

  Electricity · mapped topic

• H04N5/2254 Primary

  Electricity · mapped topic

• C09J163/00 Primary

  Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins · CPC title