Methods and apparatus to detect an ink ribbon based on types of light
First Claim
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1. An apparatus, comprising:
- a light emitter positioned along a path traveled by an ink ribbon through a media processing device, the light emitter to emit un-polarized light into a field of view, wherein the light emitter is positioned relative to the path such that at least a portion of the un-polarized light becomes polarized via reflection off the ink ribbon; and
a multi-element detector configured to indicate;
whether light is present in the field of view; and
whether the unpolarized light emitted by the light emitter was polarized via reflection off the ink ribbon.
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Abstract
Provided herein are devices, systems, methods and various means, including those related to printer systems and, more particularly, relate to methods, apparatuses, systems and other means for monitoring a printer ribbon. Some embodiments use a multi-element detector, which is configured to detect a particular type of light emitted from a light emitter. The multi-state detector can include two sensors, one of which includes a polarizer filter that blocks polarized light. Embodiments can be used to determine, among other things, whether or not a printer ribbon is installed in a printer without the use of a snap plate.
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17 Claims
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1. An apparatus, comprising:
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a light emitter positioned along a path traveled by an ink ribbon through a media processing device, the light emitter to emit un-polarized light into a field of view, wherein the light emitter is positioned relative to the path such that at least a portion of the un-polarized light becomes polarized via reflection off the ink ribbon; and a multi-element detector configured to indicate; whether light is present in the field of view; and whether the unpolarized light emitted by the light emitter was polarized via reflection off the ink ribbon. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification