Light pipe illumination system and method

• US 9,329,332 B2
• Filed: 06/27/2014
• Issued: 05/03/2016
• Est. Priority Date: 10/24/2003
• Status: Expired due to Fees

• Current Assignee: Cognex Corporation
• Original Assignee: Cognex Corporation
• Inventors: Gerst, Carl W. III, Equitz, William H., Testa, Justin, Nadabar, Sateesha
• Primary Examiner(s): TRAIL, ALLYSON NEEL
• Application Number:
  US14/316,906
• Publication Number:
  US 20150016139A1
• Time in Patent Office: 676 Days
• Field of Search: 235/455, 235/482.01, 235/472.02, 235/462.42, 385/43, 250/234, 710/300
• US Class Current: 1/1
• CPC Class Codes: G02B 6/0096 the lights guides being of the hollow type
• CPC Class Codes: G06K 2007/10485 Arrangement of optical elements
• CPC Class Codes: G06K 2207/1011 Aiming
• CPC Class Codes: G06K 7/10732 Light sources
• CPC Class Codes: G06K 7/1404 Methods for optical code recognition

Abstract

Systems and methods provide for illuminating a subject using a light pipe that transmits light from a source. A method includes providing a light pipe, the light pipe defining an inner lumen through which the image sensor views the subject; providing a light source in alignment with a proximal portion of the light pipe; and using the light source, projecting a light into the light pipe and through the light pipe, the light pipe including a distal portion for providing a high-angle bright field illumination pattern on the subject with a first portion of the light and for reflecting a second portion of the light for providing a low-angle dark field illumination pattern on the subject.

Claims

1. A handheld scanning device comprising:

a grip section;

a body section;

a first light pipe comprising a light transmissive material terminating in an angled tip;

a second light pipe comprising a light transmissive material terminating in a square tip; and

a first and second ring illuminator that are aligned with the first and second light pipe wherein at least one of the first or second light pipes are removably mounted to the body section.

2. The handheld scanning device of claim 1 wherein the first and second light pipes have a cross section with a predetermined shape.

3. The handheld scanning device of claim 2 wherein the predetermined shape is one of a circle, a rectangle, or a curved shape.

4. The handheld scanning device of claim 1 wherein the first light pipe and the second light pipe are mounted together with a securing ring sized and arranged to secure to a camera assembly.

5. The handheld scanning device of claim 4 wherein the mounting ring is constructed and arranged to removably secure the first light pipe and the second light pipe to the camera assembly.

6. The handheld scanning device of claim 1 wherein the first light pipe is nested within the second light pipe.

7. The handheld scanning device of claim 1 wherein the second light pipe is nested within the first light pipe.

8. The handheld scanner device of claim 1 wherein of wherein the first and second ring illuminator has four quadrants that are configured to be modulated separately.

9. The handheld scanner of claim 1 wherein the angled tip is configured to generate low angle illumination on an area of interest.

10. The handheld scanner of clam 1 wherein the square tip is configured to generate bright field illumination on an area of interest.