Patent ID: 7690769
Filing Date: 2010-04-06
Classification: B41J

Abstract:
1. A recording head for use in an inkjet recording device, the recording head comprising: a cavity unit having a plurality of nozzles each of which ejects a droplet of an ink, a plurality of communication holes which communicate with the plurality of nozzles, respectively, and a common ink chamber which communicates, in the cavity unit, with each of the communication holes and which temporarily stores the ink to be supplied to said each of the nozzles via a corresponding one of the communication holes; wherein the cavity unit has a plurality of inner wall surfaces which cooperate with each other to define the common ink chamber and which comprise, in a state in which the recording head is used in the inkjet recording device, (a) an upper wall surface having respective open ends of the communication holes and (b) a lower wall surface opposed to the upper wall surface; wherein the upper wall surface further has a plurality of grooves each of which is connected, at one end thereof, to the open end of a corresponding one of the communication holes such that said each groove has, in at least a vicinity of said open end, a width smaller than a dimension of said open end in a direction of said width of said each groove; wherein the plurality of grooves comprise a plurality of groups of individual ink-flow grooves each group of which is associated with a correspond one of the plurality of communication holes, such that the individual grooves of said each group are formed around said corresponding communication hole and are connected, at respective one ends thereof, to the open end of said corresponding communication hole; and wherein the upper wall surface further has a plurality of individual communication grooves each of which is associated with a corresponding one of the plurality of communication holes, such that said each individual communication groove is not directly connected to said corresponding communication hole and the individual ink-flow grooves of said each group communicate with each other through a corresponding one of the individual communication grooves.