Element board for printhead, printhead and printhead control method
AssigneeCanon Kabushiki Kaisha
InventorRyo Kasai
Life of this patent
Estimating the term…
Abstract
In a printhead having a plurality of printing elements, a shift register which serially receives printing data corresponding to the number of printing elements, a latch which latches the printing data input to the shift register, and a driving circuit which selectively drives the printing elements in accordance with the printing data latched by the latch and a signal representing a driving period, the latch state of the latch is controlled by the signal representing the driving period. The signal representing the driving period and a signal for controlling the latch state of the latch are commonly used to decrease the number of input terminals of the printhead.
Claims10
An element board for a printhead, the element board comprising:
- a plurality of printing elements;
- a shift register which serially receives printing data corresponding to the number of printing elements from a data input terminal and receives a clock signal from a clock input terminal;
- a data input unit which serially inputs the printing data to said shift register;
- an enable signal input unit which inputs an enable signal, the enable signal serving as a basis for both a latch signal and a heat enable signal, the heat enable signal representing a driving period of the printing elements;
- a latch circuit which latches the printing data input to said shift register in response to the latch signal;
- and
- a driving circuit which selectively drives the printing elements in accordance with the printing data latched by said latch circuit and the heat enable signal representing the driving period of the printing elements;
- wherein said driving circuit drives the printing elements upon a lapse of a certain time after said latch circuit latches the printing data.
A printhead which has a plurality of printing elements and prints by driving the printing elements in accordance with serially input printing data, comprising:
- a shift register which serially receives printing data corresponding to the number of printing elements from a data input terminal and receives a clock signal from a clock input terminal;
- a data input unit which serially inputs the printing data to said shift register;
- an enable signal input unit which inputs an enable signal, the enable signal serving as a basis for both a latch signal and a heat enable signal, the heat enable signal representing a driving period of the printing elements;
- a latch circuit which latches the printing data input to said shift register in response to the latch signal;
- a driving circuit which selectively drives the printing elements in accordance with the printing data latched by said latch circuit and the heat enable signal representing the driving period of the printing elements,
- wherein said driving circuit drives the printing elements upon a lapse of a certain time after said latch circuit latches the printing data.
Dependencies are inferred from the claim text.