Optical design for laser encoder resolution extension with three-dimensional motion decoupling
First Claim
1. An optical system for laser encoder resolution extension with three-dimensional motion decoupling capability comprising:
- a moving target;
said moving target having three-dimensional linear motion freedom;
a fixed base positioned laterally spaced apart in an X direction from said moving target;
a single first prism mounted on said moving target, a plurality of prisms, a retroreflector, a laser source, and a detector mounted on said fixed base;
said single first prism being larger than said plurality of prisms;
a three-dimensional optical path defined by said first prism, said plurality of prisms, and said retroreflector for reflecting a laser beam from said laser source to said detector with said laser beam being reflected multiple times between said single first prism and each of said plurality of prisms;
said three-dimensional optical path providing multiple times optical resolution extension power for linear displacement measurement and encoding;
said optical system being sensitive to a motion of said moving target in said X direction and being substantially unaffected by movement in a Y direction and a Z direction.
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Abstract
An optical system is provided for laser encoder resolution extension with three-dimensional motion decoupling capability. The optical system includes a first prism mounted on a moving target, and a plurality of prisms, a retroreflector, a laser source, and a detector mounted on a fixed base. The moving target has three-dimensional linear motion freedom. The first prism on the moving target and the plurality of prisms and the retroreflector on the fixed base reflect a laser beam from the laser source to the detector define a three-dimensional optical path. The three-dimensional optical path provides multiple times optical resolution extension power for linear displacement measurement and encoding. This optic system is only sensible to the target motion on X direction and is substantially unaffected by movement in the Y and Z directions.
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Citations
20 Claims
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1. An optical system for laser encoder resolution extension with three-dimensional motion decoupling capability comprising:
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a moving target;
said moving target having three-dimensional linear motion freedom;
a fixed base positioned laterally spaced apart in an X direction from said moving target;
a single first prism mounted on said moving target, a plurality of prisms, a retroreflector, a laser source, and a detector mounted on said fixed base;
said single first prism being larger than said plurality of prisms;
a three-dimensional optical path defined by said first prism, said plurality of prisms, and said retroreflector for reflecting a laser beam from said laser source to said detector with said laser beam being reflected multiple times between said single first prism and each of said plurality of prisms;
said three-dimensional optical path providing multiple times optical resolution extension power for linear displacement measurement and encoding;
said optical system being sensitive to a motion of said moving target in said X direction and being substantially unaffected by movement in a Y direction and a Z direction.- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification