The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 11, 1986
Filed:
Feb. 06, 1984
Edwin Langberg, Marlton, NJ (US);
Other;
Abstract
Digitizer incorporates two novel position encoders. One position encoder comprises means for periodic spatial calibration against an accurate pattern of reference marks, thereby improving accuracy to the limit of resolution. Optionally, it also includes temperature and humidity compensation. Superior accuracy is achieved without tight tolerance requirements for mechanical components. The same technique can be used for error detection in digital motion control. The other position encoder, used primarily for menu data entry, is based on a discrete resistor array, combined with pulse position modulation of array columns. Its main advantage is simplicity and low cost. The digitizer is ergonomically designed, so that the operator can digitize coordinates with the left hand while inputing from the menu with the right hand.