Seiko Epson Corporation

Masanori Koizumi

Toru Matsuyama

Shuichi Nakano

Masashi Kamiyanagi

Eiji Takagi

Shunya Komatsu

A print head assembled to a liquid ejecting apparatus ejecting a liquid with respect to a medium includes an ejecting portion ejecting the liquid in response to a drive signal and an electrically erasable non-volatile memory, and the non-volatile memory stores history information changing in accordance with an operation state of the print head.

Print head and liquid ejecting apparatus

A print head drive circuit drives a print head including an ejecting portion ejecting a liquid in response to a drive signal propagating through a drive signal line and a storage portion storing ejecting portion-related information changing in accordance with use of the ejecting portion, in which processing of reading the ejecting portion-related information changing in accordance with the use from the storage portion is performed before the drive signal for ejecting the liquid from the ejecting portion is supplied to the print head.

Print head drive circuit and liquid ejecting apparatus

A print head drive circuit outputs an output signal from a terminal electrically coupled to a low voltage logic signal input terminal to which a low voltage logic signal is input and has a first mode in which the print head drive circuit controls a print head to execute reading processing of reading information stored in a memory and not to execute ejection control processing of controlling whether or not to supply a high voltage signal to an ejecting portion group by switching a switch group in accordance with the output signal and a second mode in which the print head drive circuit controls the print head not to execute the reading processing and to execute the ejection control processing in accordance with the output signal.

A print head includes ejecting portions ejecting liquid by being supplied with a high voltage signal, a switch group switching between whether or not to supply the high voltage signal to the first ejecting portion group in accordance with a low voltage logic signal, a memory, a high voltage signal input terminal, and a low voltage logic signal input terminal, the print head having a first mode in which the print head executes reading processing of reading information stored in the memory and does not execute ejection control processing of controlling whether or not to supply the high voltage signal to the first ejecting portion group by switching the switch group in accordance with an input signal input from the low voltage logic signal input terminal and a second mode in which the print head does not execute the reading processing and executes the ejection control processing.

A semiconductor device includes: a substrate on which is formed an interconnecting pattern; a first semiconductor chip provided above the substrate and having a first electrode on a surface facing the substrate; and a second semiconductor chip provided above the first semiconductor chip and having a second electrode on a surface facing the substrate. The substrate has a bent portion inclined from the first electrode to the second electrode. The interconnecting pattern extends along the bent portion and electrically connected to the first and second electrodes.

Semiconductor device and method of fabrication thereof, optical module and method of fabrication thereof, circuit board, and electronic instrument

A chopper type comparator is equipped with an input switching circuit that switches between an input voltage V and a reference voltage V , a capacitor C , and an amplification circuit that is formed from amplifiers (CMOS inverters) . The input switching circuit is provided with a switch CT that turns on and off the input voltage V , and a switch CT that turns on and off the reference voltage V . Rising and falling of control signals to the P channel and N channel transistors of the switches CT and CT are simultaneously conducted, and an intersection of the rising and falling sections thereof coincide with a center of the amplitude of the drive signals.

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Suwa, Japan

Masanori Koizumi