Low maintenance flat mail line scan camera system

• US 7,672,479 B2
• Filed: 08/23/2005
• Issued: 03/02/2010
• Est. Priority Date: 12/08/2004
• Status: Expired due to Fees

• Current Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Corporation (Martin Marietta Corporation)
• Inventors: Kehley, Glenn L., Reyner, Gregory
• Primary Examiner(s): Ahmed; Samir A.
• Assistant Examiner(s): Fitzpatrick; Atiba O
• Application Number:
  US11/209,532
• Publication Number:
  US 20060120563A1
• Time in Patent Office: 1,652 Days
• Field of Search: 382100-102, 705/400, 705/401, 250/239, 250/559.22, 250/236, 250/566, 250/568, 250/570, 250/234, 235/462.01, 235/454, 235/462.22, 235/462.24, 235/472.01, 235/462.14, 702/156, 702/159, 702/170, 702/172
• US Class Current: 382/101
• CPC Class Codes: G06V 10/145 Illumination specially adapted for pattern recognition, e.g. using gratings
• CPC Class Codes: G06V 10/147 Details of sensors, e.g. sensor lenses fingerprint or palmprint sensors G06V40/13; vascular sensors G06V40/145; eye sensors G06V40/19

Abstract

A camera assembly is disclosed which may be implemented on a mail processing system for photographing flats mail items. In one embodiment, the assembly includes lighting components (e.g., light emitting diodes) which are capable of projecting light toward a mail item in a viewing station at a specific angle, which angle may be adjusted to reduce the amount of specular reflection from an item toward a camera. The lighting components may reside in a nose unit which may be easily attached to and detached from the housing for ease of maintenance. The nose unit may be attachable to the housing in a manner which seals the camera and lighting components off from the operating environment, such that airborne dust and debris does not enter the housing or nose unit and damage the camera or lighting components.

Claims

1. A camera assembly for use in a mail processing system, the camera assembly comprising a camera with a line of view via an aperture toward a viewing station in the mail processing system, the mail processing system being configured to transport a mail item through the viewing station in a direction which is substantially perpendicular to the line of view of the camera, the camera assembly comprising a plurality of lighting components configured to project light toward the viewing station, the plurality of lighting components being disposed to project light toward the viewing station such that the light does not travel via the aperture, each of the plurality of lighting components being configured to project light toward the viewing station at a substantially precise acute angle of at least twenty degrees from the line of view, the plurality of lighting components comprising first and second groups of lighting components oriented to project light toward the viewing station at respective first and second angles, the first angle being different than the second angle.

2. The camera assembly of claim 1, wherein at least one of the first angle and the second angle is at least thirty-tree degrees from the line of view.

3. The camera assembly of claim 1, wherein at least one of the first angle and the second angle is at least forty-nine degrees from the line of view.

4. The camera assembly of claim 1, wherein the plurality of lighting components comprise light-emitting diodes,

5. The camera assembly of claim 4, wherein the light-emitting diodes are white light-emitting diodes.

6. The camera assembly of claim 1, further comprising a housing and a nose unit which may be attached and detached from the housing, and wherein the plurality of lighting components reside in the nose unit.

7. The camera assembly of claim 6, wherein the nose unit comprises a face through which the plurality of lighting components project light toward the viewing station.

8. The camera assembly of claim 1, wherein at least one of the first and second groups of lighting components is arranged in at least one column disposed parallel to the aperture.

9. The camera assembly of claim 8, wherein each of the first and second groups of lighting components is separately configurable to project light toward the item at an angle with respect to the line of view.

10. The camera assembly of claim 1, wherein the aperture is suitably sized to provide the camera with a view of a height of a flats item.