Printhead and printing apparatus using said printhead
AssigneeCanon Kabushiki Kaisha
InventorYasuo Fujii
Life of this patent
Estimating the term…
Abstract
Printhead structured such that printing elements are divisionally driven in unit of plural blocks, comprises: an input terminal to which printing data and encoded block data are serially inputted; a shift register sequentially shifting and storing one bit at a time the data serially inputted from the input terminal; a latch temporarily storing the data stored in the shift register; a decoder decoding the block data stored in the latch; and an AND circuit. The decoder outputs a signal in which encoded block data is partially decoded, and the AND circuit determines blocks to be driven based on the partially decoded signal. This structure enables to reduce an area of a printhead substrate, thereby enabling cost reduction of a printhead.
Claims11
A printhead structured such that a plurality of printing elements arranged in a predetermined direction and a driving circuit driving the printing elements are provided on one substrate, and that the printing elements are divisionally driven in unit of plural blocks, comprising:
- an input terminal serially inputting printing data corresponding to each printing element and encoded block data designating a block to be driven;
- a shift register sequentially shifting and storing one bit at a time the data serially inputted from said input terminal;
- a latch temporarily storing the data stored in said shift register;
- a decoder decoding the encoded block data among the data stored in said latch;
- and
- an AND circuit performing AND operation of the printing data outputted from said latch, an output of said decoder, and a driving signal designating driving timing of the driving circuit,
- wherein said decoder outputs a signal in which the encoded block data is partially decoded, and
- said AND circuit determines a block to be driven based on the partially decoded signal.
A printhead substrate structured such that a plurality of printing elements arranged in a predetermined direction and a driving circuit driving the printing elements are provided on one substrate, and that the printing elements are divisionally driven in unit of plural blocks, comprising:
- an input terminal serially inputting printing data corresponding to each printing element and encoded block data designating a block to be driven;
- a shift register sequentially shifting and storing one bit at a time the data serially inputted from said input terminal;
- a latch temporarily storing the data stored in said shift register;
- a decoder decoding the encoded block data among the data stored in said latch;
- and
- an AND circuit performing AND operation of the printing data outputted from said latch, an output of said decoder, and a driving signal designating driving timing of the driving circuit,
- wherein said decoder outputs a signal in which the encoded block data is partially decoded, and
- said AND circuit determines a block to be driven based on the partially decoded signal.
A printing apparatus utilizing a printhead structured such that a plurality of printing elements arranged in a predetermined direction and a driving circuit driving the printing elements are provided on one substrate, and that the printing elements are divisionally driven in unit of plural blocks, said printhead comprising:
- an input terminal serially inputting printing data corresponding to each printing element and encoded block data designating a block to be driven;
- a shift register sequentially shifting and storing one bit at a time the data serially inputted from said input terminal;
- a latch temporarily storing the data stored in said shift register;
- a decoder decoding the encoded block data among the data stored in said latch;
- and
- an AND circuit performing AND operation of the printing data outputted from said latch, an output of said decoder, and a driving signal designating driving timing of the driving circuit,
- wherein said decoder outputs a signal in which the encoded block data is partially decoded, and
- said AND circuit determines a block to be driven based on the partially decoded signal.
Dependencies are inferred from the claim text.