Light pipe illumination system and method
First Claim
1. An illuminator for illuminating a subject that is imaged by an image sensor comprising:
- a first ring light source arranged around a perimeter of a predetermined shape communicating with a first light pipe defining a hollow tube having a cross-section with the predetermined shape, the first light pipe defining an inner lumen through which the sensor views the subject and the light pipe including a tip adapted to project a low-angle dark field illumination pattern on the subject; and
an electronic controller that selectively controls predetermined portions of the first ring light source to project a variable light around the perimeter.
2 Assignments
0 Petitions
Accused Products
Abstract
A system and method is provided for illuminating a subject using a light pipe that transmits light from a source, such as an LED ring illuminator to an outlet that directs the light appropriately as either bright field illumination, dark field illumination or both. The light pipe can include concentric cylinders, typically with a bright field illuminator nested within a dark field illuminator. The tip of the dark field illuminator may be angled so as to internally reflect light inwardly toward the central optical axis of a camera at a low angle. The tip can be located near the focal plane of the camera for the desired field of view. The field of view of the camera sensor can be modified to reject data outside of a illumination field of a particular shape. This illumination field can be created by shaping the light pipe in a predetermined form that projects the modified illumination field. Likewise, a set of aiming illuminators (in, for example, a noticeable color) can be provided around the perimeter of the light pipe to delineate outer boundaries of the illumination field or area of interest. These approaches facilitate better aiming of the sensor into the desired area of interest so that it is illuminated and/or acquired most-fully.
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Citations
35 Claims
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1. An illuminator for illuminating a subject that is imaged by an image sensor comprising:
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a first ring light source arranged around a perimeter of a predetermined shape communicating with a first light pipe defining a hollow tube having a cross-section with the predetermined shape, the first light pipe defining an inner lumen through which the sensor views the subject and the light pipe including a tip adapted to project a low-angle dark field illumination pattern on the subject; and an electronic controller that selectively controls predetermined portions of the first ring light source to project a variable light around the perimeter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An illuminator for illuminating a subject that is imaged by an image sensor comprising:
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a first ring light source arranged around a perimeter of a predetermined shape communicating with a first light pipe defining a hollow tube having a cross-section with the pre-determined shape, the first light pipe defining an inner lumen through which the sensor views the subject and the first light pipe including a tip adapted to project a low-angle dark field illumination pattern on the subject; and a second ring light source coaxial with respect to the first ring light source and communicating with a second light pipe coaxial with the first light pipe, the second light pipe having a tip adapted to project a high-angle bring field illumination pattern with respect to the subject. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. An illuminator for illuminating a subject that is imaged by an image sensor comprising:
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a first ring light source arranged in a perimeter of a predetermined shape communicating with a first light pipe having a cross-section with the predetermined shape, the first light pipe defining an inner lumen through which the sensor views the subject and the first light pipe including a tip adapted to project a low-angle dark field illumination pattern on the subject; a second ring light source coaxial with respect to the first ring light source and communicating with a second light pipe coaxial with the first light pipe, the second light pipe having a tip adapted to project a high-angle bright field illumination pattern with respect to the subject; and wherein the second ring is nested within the first ring and wherein the tip of the second ring is recessed with respect to the tip of the first ring so as to provide an area in an inner wall of the first ring adjacent to the tip of the first ring for projection of the low angle dark field illumination pattern therefrom.
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23. An illuminator for illuminating a subject that is imaged by an image sensor comprising:
a ring light source arranged around a perimeter of a predetermined shape communicating with a light pipe defining a hollow tube having a cross-section with the predetermined shape, the light pipe defining an inner lumen through which the sensor views the subject and the light pipe including a tip adapted to project a high-angle bright field illumination pattern with respect to the subject. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. An illuminator for illuminating a subject that is imaged by an image sensor having a field of view comprising:
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a ring light source arranged around a perimeter of a predetermined shape communicating with a light pipe defining a hollow tube having a cross-section with the predetermined shape, the light pipe defining an inner lumen through which the sensor views the subject and the light pipe including a tip adapted to project an illumination pattern with respect to the subject; and wherein the illumination pattern covers a reduced area with respect to the field of view whereby an aiming location is highlighted by the illumination pattern. - View Dependent Claims (31, 32, 33)
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34. An illuminator for illuminating a subject that is imaged by an image sensor comprising:
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a first ring light source arranged around a perimeter of a predetermined shape communicating with a first light pipe defining a hollow tube having a cross-section with the predetermined shape, the first light pipe defining an inner lumen through which the sensor views the subject and the light pipe including a tip adapted to project a low-angle dark field illumination pattern on the subject; and a bright field illuminator located external to the light pipe. - View Dependent Claims (35)
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Specification