Head substrate, printhead, head cartridge, printing apparatus, and method for inputting/outputting information
First Claim
1. A head substrate comprising:
- a plurality of printing elements for printing;
a plurality of first driving elements which correspond to said plurality of printing elements, respectively, for driving said plurality of printing elements;
a fuse ROM which stores information;
a second driving element for driving said fuse ROM;
input means for inputting a printing signal to cause said plurality of printing elements to print and a block selection signal to time-divisionally drive said plurality of printing elements;
selective driving means for selectively driving said plurality of first driving elements on the basis of the printing signal and the block selection signal input by said input means;
a first pad for applying a first voltage to said fuse ROM to write information; and
a second pad for applying a second voltage to read out the information from said fuse ROM,wherein, in order to selectively drive said second driving element to operate said fuse ROM, said second driving element connects to said selective driving means, and said fuse ROM is selectively operative on the basis of signals input from said input means.
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Accused Products
Abstract
An object of this invention is to provide a safe and reliable head substrate having a fuse ROM without increasing the substrate size. To achieve the object, a head substrate includes a plurality of printing elements for printing, first driving elements which drive the printing elements, a fuse ROM which stores information, a second driving element which drives the fuse ROM, input device for inputting a printing signal to cause the plurality of printing elements to print and a block selection signal to time-divisionally drive the printing elements, selective driving device for selectively driving the first driving elements on the basis of the input printing signal and block selection signal, a first pad which applies a first voltage to the fuse ROM to write information, and a second pad which applies a second voltage to read out the information from the fuse ROM. In order to selectively drive the second driving element to operate the fuse ROM, the second driving element connects to the selective driving device, and the fuse ROM is selectively operative on the basis of the signals input from the input device.
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Citations
18 Claims
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1. A head substrate comprising:
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a plurality of printing elements for printing; a plurality of first driving elements which correspond to said plurality of printing elements, respectively, for driving said plurality of printing elements; a fuse ROM which stores information; a second driving element for driving said fuse ROM; input means for inputting a printing signal to cause said plurality of printing elements to print and a block selection signal to time-divisionally drive said plurality of printing elements; selective driving means for selectively driving said plurality of first driving elements on the basis of the printing signal and the block selection signal input by said input means; a first pad for applying a first voltage to said fuse ROM to write information; and a second pad for applying a second voltage to read out the information from said fuse ROM, wherein, in order to selectively drive said second driving element to operate said fuse ROM, said second driving element connects to said selective driving means, and said fuse ROM is selectively operative on the basis of signals input from said input means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification