×

Method and apparatus for summing temperature changes to detect ink flow

  • US 5,315,316 A
  • Filed: 01/04/1993
  • Issued: 05/24/1994
  • Est. Priority Date: 10/29/1991
  • Status: Expired due to Fees
First Claim
Patent Images

1. An apparatus for detecting ink flow through a thermal inkjet printhead, comprising:

  • a temperature sensor for sensing a temperature of the printhead as the printhead prints; and

    detector circuitry in communication with the temperature sensor for;

    summing the temperature of the printhead sensed a number of times during printing of a set of dots to provide a sum;

    comparing the sum to a value; and

    based on such comparison determining inkflow through the printhead.

View all claims
  • 1 Assignment
Timeline View
Assignment View
    ×
    ×