Low profile illumination for direct part mark readers
First Claim
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1. An integrated optical transmitter for use in a direct part mark reader, the transmitter comprising:
- a dark field illumination transmitter that changes the direction of light passing through the dark field illumination transmitter to project dark field illumination at an object, the dark field illumination transmitter including a window adapted to provide a transmission path for reflected illumination in an optical path along an optical axis of a sensor module; and
a plurality of bright field illumination transmitters adjacent to and separate from the dark field illumination transmitter, the bright field illumination transmitters adapted to project bright field illumination at the object, the bright field illumination transmitters being without a window and being offset from the optical axis.
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Abstract
An industrial reader is provided with an image formation system that is particularly adapted to read bar codes and two-dimensional symbols marked directly on objects. The image formation system includes illumination sources and illumination transmissive components that produce a combination of bright field and dark field illumination.
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Citations
16 Claims
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1. An integrated optical transmitter for use in a direct part mark reader, the transmitter comprising:
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a dark field illumination transmitter that changes the direction of light passing through the dark field illumination transmitter to project dark field illumination at an object, the dark field illumination transmitter including a window adapted to provide a transmission path for reflected illumination in an optical path along an optical axis of a sensor module; and a plurality of bright field illumination transmitters adjacent to and separate from the dark field illumination transmitter, the bright field illumination transmitters adapted to project bright field illumination at the object, the bright field illumination transmitters being without a window and being offset from the optical axis. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An identification mark reader comprising:
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an illumination transmitter defining an inner lumen through which the image sensor views a subject; an illumination module including a plurality of illuminators to provide light to the illumination transmitter; and the illumination transmitter including at least a first light exiting surface and a second light exiting surface, the first light exiting surface being adapted to allow at least a portion of the light from within the illumination transmitter to pass through and out of the first light exiting surface to provide bright field illumination on the subject, and the second light exiting surface being adapted to allow at least a portion of the light to pass through and out of the second light exiting surface to provide dark field illumination on the subject. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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Specification