System including a seamless lens cover and related methods

• US 10,127,686 B2
• Filed: 05/19/2016
• Issued: 11/13/2018
• Est. Priority Date: 08/09/2013
• Status: Active Grant

• Current Assignee: Thermal Imaging Radar LLC
• Original Assignee: Thermal Imaging Radar LLC
• Inventors: Dortch, Michael D.
• Primary Examiner(s): Phan, Minh
• Application Number:
  US15/159,523
• Publication Number:
  US 20160266380A1
• Time in Patent Office: 908 Days
• CPC Class Codes: B24B 9/14 of optical work, e.g. lenses, prisms control of the position of the tool for bevelling optical work B24B47/225
• CPC Class Codes: B29C 2045/0058 removing material
• CPC Class Codes: B29C 45/0055 Shaping
• CPC Class Codes: B29K 2023/0683 UHMWPE, i.e. ultra high molecular weight polyethylene
• CPC Class Codes: B29K 2995/0026 Transparent
• CPC Class Codes: B29K 2995/0029 Translucent
• CPC Class Codes: B29K 2995/0097 Thickness
• CPC Class Codes: B29L 2031/764 Photographic equipment or accessories memory cards B29L2017/006
• CPC Class Codes: G02B 27/0006 with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation G02B1/18 takes precedence; cleaning in general B08B
• CPC Class Codes: G03B 11/041 Lens caps as separate accessory accessories in general G03B17/56
• CPC Class Codes: G03B 37/02 with scanning movement of lens or cameras
• CPC Class Codes: G06T 1/0007 Image acquisition
• CPC Class Codes: G06T 2207/10016 Video; Image sequence
• CPC Class Codes: G06T 2207/10028 Range image; Depth image; 3D point clouds
• CPC Class Codes: G06T 2207/10048 Infrared image
• CPC Class Codes: G06T 2207/30232 Surveillance
• CPC Class Codes: G06T 3/4038 Image mosaicing, e.g. composing plane images from plane sub-images
• CPC Class Codes: G06T 7/55 from multiple images
• CPC Class Codes: G06T 7/74 involving reference images or patches
• CPC Class Codes: H04N 23/20 for generating image signals from infrared radiation only
• CPC Class Codes: H04N 23/60 : Control of cameras or camera modules
• CPC Class Codes: H04N 23/698 : for achieving an enlarged field of view, e.g. panoramic image capture
• CPC Class Codes: H04N 3/04 : having a moving aperture also apertures covered by lenses
• CPC Class Codes: H04N 5/2628 : Alteration of picture size, shape, position or orientation, e.g. zooming, rotation, rolling, perspective, translation
• CPC Class Codes: H04N 5/33 : Transforming infrared radiation cameras or camera modules for generating image signals from infrared radiation H04N23/20; circuitry of SSIS for transforming infrared radiation into image signals H04N25/20

Abstract

A seamless lens cover, and methods of forming such a seamless lens cover. The cap structure that covers a camera of a rotating panoramic camera system includes a seamless lens cover through which images are obtained by the camera. The cap structure may be injection molded at an initial lens cover thickness, and then a portion of the as molded initial lens cover thickness may be removed (e.g., by machining away) to achieve the final desired thickness. By such a method, the lens cover may be injection molded at thicknesses suitable for injection molding (e.g., about 0.06 to about 0.1 inch), after which most of the thickness may be machined away, to provide a seamless lens cover having a thickness of less than about 0.015 inch, exhibiting at least 60% transmittance to the thermal spectrum, no lensing characteristics, and no curvature effect.

Claims

1. A cap structure including a seamless lens cover, which cap structure forms a portion of a rotating camera system, the cap structure comprising:

a generally cylindrical hollow body including an open bottom end, a top end, and a generally cylindrical sidewall extending therebetween;

a top cap that is a separate piece relative to the top end of the generally cylindrical hollow body, the top cap being positioned or positionable over the top end of the generally cylindrical hollow body;

wherein the generally cylindrical sidewall is a lens cover through which a camera of the camera system directly obtains images, the cylindrical sidewall being seamless;

wherein the generally cylindrical sidewall has a substantially uniform thickness that is less than 0.025 inch.

2. The cap structure as recited in claim 1, wherein the cylindrical sidewall has a substantially uniform thickness that is less than 0.015 inch.

3. The cap structure as recited in claim 1, wherein the cylindrical sidewall has a substantially uniform thickness that is from about 0.009 inch to about 0.013 inch.

4. The cap structure as recited in claim 1, wherein the lens cover has a transmittance to a thermal spectrum of at least about 60%, exhibits no seams, no significant lensing characteristics, and no significant curvature effect.

5. The cap structure as recited in claim 1, wherein the generally cylindrical sidewall includes a taper, the taper being less than 4°

.

6. The cap structure as recited in claim 1, wherein the final desired cover thickness is no more than 0.014 inch.

7. The cap structure as recited in claim 1, wherein the cap structure comprises an ultra-high molecular weight polyethylene material.

8. The cap structure as recited in claim 1, wherein the cap structure is formed from a single integral piece of ultra-high molecular weight polyethylene material.

9. The cap structure as recited in claim 5, wherein the taper is less than 1°

.

10. The cap structure as recited in claim 1, wherein the generally cylindrical sidewall is tapered, so as to be a truncated cone shape.

11. The cap structure as recited in claim 1, wherein the generally cylindrical sidewall is not tapered, so as to be cylindrical in shape, rather than a cone or truncated cone.

12. The cap structure as recited in claim 1, wherein:

(i) the generally cylindrical hollow body defines a hollow interior, and wherein the camera is at least partially positioned within the hollow interior of the cap structure, with the camera positioned between the open bottom end and the top end; and

(ii) wherein the camera is positioned within the cap structure such that images obtained by the camera are obtained along a line of sight that is generally perpendicular to the generally cylindrical sidewall of the cap structure.

13. The rotating camera system as recited in claim 1, wherein the generally cylindrical sidewall is translucent, rather than transparent.

14. A rotating camera system including a cap structure having a seamless lens, the system comprising:

a rotating camera that is capable of rotation through 360°

;

a cap structure that serves as a lens cover for the rotating camera, the cap structure including;

a generally cylindrical hollow body including an open bottom end, a top end, and a generally cylindrical sidewall extending therebetween, the generally cylindrical sidewall being translucent rather than transparent, and the generally cylindrical sidewall being seamless;

wherein the translucent generally cylindrical sidewall serves as the lens cover through which the rotating camera of the camera system obtains images;

wherein the generally cylindrical sidewall has a substantially uniform thickness that is less than 0.025 inch; and

a top cap that is a separate piece relative to the top end of the generally cylindrical hollow body, the top cap being positioned or positionable over the top end of the generally cylindrical hollow body.

15. The rotating camera system as recited in claim 14, wherein a top portion of the cap structure, including the top end of the generally cylindrical sidewall which is covered by the top cap, is of a diameter that is less than the diameter of the generally cylindrical sidewall that serves as the lens cover.

16. The rotating camera system as recited in claim 14, further comprising a thickened flange adjacent the open bottom end of the generally cylindrical hollow body, the thickened flange including structure for securing the cap structure to an adjacent portion of the camera system.

17. The rotating camera system as recited in claim 16, wherein the thickened flange is outwardly flared, extending radially outward from the bottom end of the generally cylindrical sidewall.

18. The rotating camera system as recited in claim 16, wherein the structure for securing the cap structure to an adjacent portion of the camera system comprises threads.

19. The rotating camera system as recited in claim 16, wherein the outwardly flared flange further includes an annular groove into which a sealing o-ring is positioned or positionable.