SIX-AXIS MOUNT

• US 20110298968A1
• Filed: 06/03/2010
• Published: 12/08/2011
• Est. Priority Date: 06/03/2010
• Status: Active Grant

• Current Assignee: Bendix Commercial Vehicle Systems LLC (Estate of Heinz Hermann Thiele)
• Original Assignee: Iteris Incorporated
• Inventors: TSENG, JEFFREY SHIE PING, MOLIN, HANS, KRETER, TODD WILLIAM, CHARNOCK, ROBERT GEORGE, STEARNS, BRADLEY STEVEN
• Granted Patent: US 8,553,131 B2
• Time in Patent Office: Days
• US Class Current: 348/373
• CPC Class Codes: G02B 27/62 Optical apparatus specially adapted for adjusting optical elements during the assembly of optical systems
• CPC Class Codes: G03B 17/12 with means for supporting objectives, supplementary lenses, filters, masks, or turrets
• CPC Class Codes: G03B 2205/00 Adjustment of optical system relative to image or object surface other than for focusing

Abstract

Provided herein is a lens mount system and related process that allow for performing six-axis active alignment with a single joining step. This system and/or process simplifies the lens attachment in a manner that makes such attachment compatible with high volume manufacturing and/or full automation.

Claims

1. A camera module, comprising:

an imager mounted on a base substrate, the imager having a planar photo sensor array;

a plurality of mounting apertures disposed about the imager and extending through the base substrate;

a lens supporting mount, including;

a base having a plurality of mounting posts spaced for suspended receipt within the mounting apertures; and

a lens disposed proximate to the upper side of the base, wherein the lens is mounted to project an image along a lens optical axis for disposition on the planar photo sensor array; and

an elastic gasket disposed about the imager and between the base of the lens supporting mount and the top surface of the base substrate, wherein the elastic gasket separates the lens supporting mount from the top surface to suspend the mounting posts in the mounting apertures; and

adhesive disposed about the mounting posts and affixing the mounting posts within the mounting apertures, wherein the lens optical axis is disposed in a desired alignment with the photo sensor array and a focal plane of the lens is disposed on the planar photo sensor array.

2. The apparatus of claim 1, wherein the mounting posts and the mounting apertures have identical spacing, wherein the mounting posts have a cross-dimension that is less than a corresponding cross-dimension of the mounting apertures.

3. The apparatus of claim 2, wherein the corresponding cross-dimension of the mounting apertures is at least 1.5 times the cross-dimension of the mounting posts.

4. The apparatus of claim 1, wherein the elastic gasket is continuous about an enclosed aperture, wherein the imager is disposed within the enclosed aperture.

5. The apparatus of claim 4, wherein the mounting posts pass through the elastic gasket, and wherein portions of the elastic gasket surrounding the posts cover portions of the mounting apertures surrounding mounting posts.

6. The apparatus of claim 4, wherein the elastic gasket is compressible permitting movement of the lens supporting mount along the optical axis of the imager prior to the mounting posts being adhered within the mounting apertures.

7. The apparatus of claim 6, wherein the elastic gasket is at least partially compressed about the entirety of the enclosed aperture.

8. The apparatus of claim 1, wherein the elastic gasket comprises a non-permeable material.

9. The apparatus of claim 8, wherein the elastic gasket comprises a closed cell foam.

10. The apparatus of claim 1, wherein said optical axis of said lens is normal to the surface of said planar photo sensor array.

11. A method for optically aligning an imager mounted on a base substrate with a lens, comprising:

positioning a planar photo sensor surface of an imager mounted on a base substrate relative to a laser beam of a fixed laser, wherein the imager is positioned such that the laser beam is positioned in a desired orientation to the planar photo sensor surface;

disposing a lens assembly over the imager, wherein;

a lens of one or more supported optical elements are positioned over the photo sensor surface and the reference laser beam projects through the lens; and

one or more mounting posts connected to the lens assembly are disposed through one or more mounting apertures in the base substrate;

rotating the lens assembly about at least a first axis to align the laser beam to be in a desired angular orientation to the photo sensor surface;

laterally moving the lens assembly to reposition the laser beam at a desired location on the photo sensor surface, wherein the mounting posts move laterally within the mounting apertures in the base substrate; and

placing adhesive around the posts within the mounting apertures.

12. The method of claim 11, wherein the positioning, rotating and laterally moving, further comprise:

generating an image output from the imager in response to the laser beam; and

utilizing the image output to adjust a position of a mounting assembly holding one of the base substrate and the lens assembly.

13. The method of claim 12, wherein the position of the mounting assembly is adjusted in an automated procedure based on the image output.

14. The method of claim 11, upon the moving the reference laser projecting through the lens being located at the to the planar photo sensor surface and prior to placing the adhesive, further comprising:

projecting an image through the lens;

moving the lens assembly in a direction normal to the planar photo sensor surface to focus the image.

15. The method of claim 11, wherein the laser beam comprises a circular laser beam, and wherein moving the laser beam to be normal to the planar surface of the imager comprises:

minimizing a concentricity error of a circular pattern output by the imager in response to the laser beam being projected on the planar photo sensor surface.

16. The method of claim 11, wherein placing the adhesive is performed from a back surface of the base substrate, wherein the lens assembly and imager are disposed on a front surface of the base substrate.

17. The method of claim 11, further comprising:

disposing a compressible gasket around the imager, wherein a base of the lens assembly rests on the gasket.

18. The method of claim 17, further comprising:

advancing the lens assembly in a direction normal to the planar surface of the imager, wherein the gasket is partially compressed.

19. A method for optically aligning an imager mounted on a base substrate with a lens, comprising:

positioning a planar photo sensor surface of an imager mounted on a base substrate relative to a reference laser beam, wherein the imager is positioned such that the reference laser beam is positioned in a desired orientation to the planar photo sensor surface;

disposing a lens assembly over the imager wherein the reference laser beam projects through a lens of the lens assembly;

adjusting the position of the lens assembly to reposition the reference laser beam in the desired position relative to the planar photo sensor surface;

projecting an image through the lens;

moving the lens assembly in a direction normal to the planar photo sensor surface to focus the image; and

affixing the position of the lens assembly relative to the base substrate.

20. The method of claim 19, wherein the imager is positioned such that the reference laser beam is positioned at the center of and normal to the planar photo sensor surface.

21. The method of claim 19, wherein the positioning and adjusting further comprise:

generating an image output from the imager in response to the reference laser beam; and

utilizing the image output to adjust a position of a mounting assembly holding one of the base substrate and the lens assembly.

22. The method of claim 21, wherein moving the lens in a direction normal comprises:

compressing or decompressing an elastic gasket disposed around the imager one the base substrate and between a base of the lens assembly and the base substrate.

23. A camera module, comprising:

an imager mounted on a base substrate, the imager having a photo sensor array formed on a planar upper surface;

a plurality of mounting apertures disposed about the imager and extending through the base substrate between the top surface and the bottom surface;

a lens assembly with a base having a plurality of mounting posts spaced for suspended receipt within the mounting apertures

an elastic gasket disposed about the imager and between the base of the lens assembly and the top surface of the base substrate, wherein the elastic gasket separates the lens assembly from the top surface; and

adhesive disposed about the mounting posts and affixing the mounting posts within the mounting apertures, wherein an optical axis of a lens of the lens assembly is aligned in a desired orientation with the photo sensor array and a focal plane of the lens is disposed on the photo sensor array.

24. The apparatus of claim 23, wherein the mounting posts and the mounting apertures have identical spacing, wherein the mounting posts have a cross-dimension that is less than a corresponding cross-dimension of the mounting apertures.

25. The apparatus of claim 23, wherein the corresponding cross-dimension of the mounting apertures is at least 1.5 times the cross-dimension of the mounting post.

26. The apparatus of claim 23, wherein the elastic gasket is continuous about an enclosed aperture, wherein the imager is disposed within the enclosed aperture.