Patent ID: 7334882
Filing Date: 2008-02-26
Classification: B41J

Abstract:
1. An ink concentration detecting apparatus for detecting ink concentration of ink containing charged colorant particles, comprising: ejection detecting means for detecting ink droplets ejected into a predetermined flight path from ink ejection means for ejecting said ink droplets into said predetermined flight path by causing predetermined electrostatic force to act on said ink to thereby detect ejection state of the thus ejected ink droplets, said ejection detecting means being disposed at a position to allow said ejected ink droplets to be detected while flying or having flown said predetermined flight path and detecting said ejected ink droplets at said predetermined flight path; and concentration detecting means for detecting ink concentration of said ejected ink droplets in correspondence to said ejection state of said ejected ink droplets detected by said ejection detecting means to thereby detect said ink concentration of said ink.