Optical density sensor calibration and self fixing

US8922777B2 · kind B2 · utility

Assignee

• HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P. · US

Inventors

• Zvi Shemer · Kiryat Gat, IL
• Ziv Gilan · Kiryat Malachi, IL
• Niv Shemtov · Rishon LeZion, IL
• Shlomo Harush · Nes Ziona, IL
• Natty Levy · Raanana, IL
• Amit Porat · Rehovot, IL

Key dates

• Filing date: Jun 14, 2011
• Grant date: Dec 30, 2014
• Expiry date: Jul 7, 2033

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N21/5907
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method of calibrating an optical density sensor comprising calculating a first pigment solid density value of an ink solution using a current first electrical output signal value from a photodetector, a current second electrical output signal value from a photodetector, and a current lens gap value, calculating a second pigment solid density value of the ink solution using a previously measured first electrical output signal value, a previously measured second electrical output signal value, and a previously measured lens gap value, comparing the current first electrical output signal value, the current second electrical output signal value, and the current lens gap value with the previously measured first electrical output signal value, the previously measure second electrical output signal value, and the previously measured lens gap value, and comparing the first pigment solid density value with the second pigment solid density value.