Printhead and printing apparatus
AssigneeCanon Kabushiki Kaisha
InventorsKengo Umeda, Nobuyuki Hirayama
Life of this patent
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Abstract
A printhead includes a plurality of element substrates, each including a plurality of printing elements, arranged in the arrayed direction of the printing elements. Each element substrate includes a temperature detection element for detecting the temperature of the element substrate. The printhead includes a head control IC connected to each element substrate and configured to control driving of the printing elements integrated on the element substrates. The head control IC and the element substrates are connected via a head terminal by a signal wire for transferring a signal between the head control IC and each element substrate. A temperature detection signal output from the temperature detection element and an image data signal are multiplexed on part of the signal wires.
Claims11
A printhead in which a plurality of element substrates, each including a plurality of printing elements, is arranged in an arrayed direction of the plurality of printing elements, comprising:
- a temperature detection element provided on each of the plurality of element substrates and configured to detect a temperature of said each of the plurality of element substrates;
- a head control IC connected to each of the plurality of element substrates and configured to control driving of the plurality of printing elements integrated on the plurality of element substrates;
- a first wire configured to transfer a signal produced by time-divisionally multiplexing a temperature detection signal output from said temperature detection element and an image data signal as a low voltage differential signal between said head control IC and each of the plurality of element substrates;
- and
- a second wire, provided in parallel to said first wire, configured to flow a current to said temperature detection element for temperature detection.
Dependencies are inferred from the claim text.