Position coordinate determination device

• US 4,018,989 A
• Filed: 12/24/1975
• Issued: 04/19/1977
• Est. Priority Date: 12/24/1975
• Status: Expired due to Term

• Current Assignee: Summagraphics Corp.
• Original Assignee: Summagraphics Corp.
• Inventors: Snyder, Edward J., Domyan, Stephen L.
• Primary Examiner(s): Robinson, Thomas A.
• Application Number:
  US05/644,035
• Time in Patent Office: 482 Days
• Field of Search: 340/347 CC, 33/1 M, 33/1 P, 181/111, 181/112, 181/125, 178/18, 178/19, 178/20
• US Class Current: 178/18.02
• CPC Class Codes: G06F 3/043 using propagating acoustic waves

Abstract

A position coordinate determination device employing duodatum digitizations for each coordinate of a pair of respective coordinates and a ratiometric proportionality calculation for calculating a corrected coordinate digitization value in each measured coordinate.

Claims

1. A self-correcting position determination device comprising a data surface, means for generating a first datum representing the location of a position with respect to a first reference on said data surface along a linear path, means for generating a second datum representing the location of said position with respect to a second reference on said data surface along said linear path, and means for combining said first and second datum to produce a third datum representative of the true location of said position on said data surface.

2. The device of claim 1 wherein said means for generating includes a signal generator coupled to said data surface at said first and second references, a time digitization means turning on in response to a signal supplied by said signal generator, and a pick-up means located at said position and responsive to the transmission of said signal through said data surface to said pick-up means for turning off said time digitization means.

3. The device of claim 1 wherein said means for generating includes a first generating means and second generating means positioned along opposite sides of said data surface along a common plurality of parallel linear paths for defining a first coordinate, and third and fourth generating means positioned along opposite sides of said data surface along a common plurality of parallel linear paths for defining a second coordinate.

4. The device of claim 3 wherein said means for generating includes a signal generator coupled to said data surface at said first and second references, a time digitization means turning on in response to a signal supplied by said signal generator, and a pick-up means located at said position and responsive to the transmission of said signal through said data surface to said pick-up means for turning off said time digitization means.

5. The device of claim 1 wherein said device includes a read-only memory storing a sequence of steps for calculating said true position, a calculator for performing a first true position calculation from said first and second datum and a second true position calculation from a third and fourth datum corresponding to a coordinate orthogonal to said first coordinate, a random access memory for temporarily storing the results of a first coordinate true position, and a read-out means, said read-only memory reading said first and second true position out through said read-out means upon completion of said second true position calculation.

6. A self-correcting position determination device comprising a data surface and means for generating a corrected position coordinate corresponding to first and second orthogonal coordinates along respective axes for determining the location of said position, said means including first means for generating a first datum representing said position with respect to a first reference, second means for generating a second datum representing said position with respect to a second reference axially aligned with said first reference along one of said orthogonal axes, means for calculating a first true axial coordinate position from a ratiometric proportionality of said first and second datum, means for storing said first true axial coordinate position, third means for generating a third datum representing said position with respect to a third reference, fourth means for generating a fourth datum representing said position with respect to a fourth reference axially aligned with said third reference along the other of said orthogonal axes, means for calculating a second true axial coordinate position from a ratiometric proportionality of said third and fourth datum, means for storing said second true axial coordinate position, and means responsive to the storing of said first and second true axial coordinate positions for reading out said first and second true axial coordinate positions as the said corrected position coordinate.

7. The device of claim 6 wherein said means for generating includes a signal generator coupled to said data surface at said first and second references, a time digitization means turning on in response to a signal supplied by said signal generator, and a pick-up means located at said position and responsive to the transmission of said signal through said data surface to said pick-up means for turning off said time digitization means.

8. The device of claim 6 wherein said means for generating includes a first generating means and second generating means positioned along opposite sides of said data surface along a common plurality of parallel linear paths for defining a first coordinate, and third and fourth generating means positioned along opposite sides of said data surface along a common plurality of parallel linear paths for defining a second coordinate.

9. The device of claim 6 wherein said means for generating includes a signal generator coupled to said data surface at said first and second references, a time digitization means turning on in response to a signal supplied by said signal generator, and a pick-up means located at said position and responsive to the transmission of said signal through said data surface to said pick-up means for turning off said time digitization means.

10. The device of claim 6 wherein said device includes a read-only memory storing a sequence of steps for calculating said true position, a calculator for performing a first true position calculation from said first and second datum and a second true position calculation from a third and fourth datum corresponding to a coordinate orthogonal to said first coordinate, a random access memory for temporarily storing the results of a first coordinate true position, and a read-out means, and means for outputting said first and second true position to an output line upon completion of said second true position calculation.