TOTAL INTERNAL REFLECTION DISPLACEMENT SCALE
First Claim
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1. A method of determining displacement of a substrate, comprising:
- directing light toward a scale disposed on the substrate, the scale comprising a plurality of total internal reflection (TIR) prisms as scale elements;
modulating the light using the TIR prisms; and
generating a signal based on the modulated light, the signal indicating the substrate displacement.
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Abstract
Methods and systems for determining the displacement of a substrate using a scale comprising TIR scale features are described. A scale that includes a number of total internal reflection (TIR) prisms as scale elements is disposed on the substrate. Light directed towards the scale is modulated by the TIR prisms. A signal indicating a displacement of the substrate is generated based on the modulated light. The signal 10 may be used to determine the web position, to control web movement, and/or to measure various web parameters.
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Citations
21 Claims
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1. A method of determining displacement of a substrate, comprising:
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directing light toward a scale disposed on the substrate, the scale comprising a plurality of total internal reflection (TIR) prisms as scale elements; modulating the light using the TIR prisms; and generating a signal based on the modulated light, the signal indicating the substrate displacement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A system for indicating substrate displacement, comprising:
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a substrate including a scale, the scale comprising total internal reflection (TIR) prisms disposed on the substrate, the TIR prisms configured to modulate light directed toward the substrate; and a transducer configured to detect the light modulated by the TIR prisms and to generate a signal indicting a displacement of the substrate based on the modulated light. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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- 18. A roll good comprising an elongated, flexible web having pattern features and an integral scale disposed thereon, the scale comprising total internal reflection (TIR) prisms configured to modulate light directed toward the web, the modulated light indicative of web position.
Specification