CN-118722000-B - Liquid ejecting apparatus and printhead

Abstract

The invention provides a liquid ejecting apparatus and a printhead, capable of protecting a driving circuit outputting a driving signal from ejected liquid. The drive signal output circuit for outputting a drive signal for driving the piezoelectric element includes an integrated circuit to which a basic drive signal is input and which outputs a first control signal, a first switching element which operates by the first control signal, and a wiring substrate provided with the integrated circuit and the first switching element, the first switching element including a first transistor chip, a first terminal, a second terminal, and a third terminal electrically connected to the first transistor chip, and a first mold member covering the first transistor chip, and a conduction state of the second terminal and the third terminal being controlled in accordance with the first control signal input to the first terminal, the second terminal, and the third terminal being provided only at positions overlapping the first mold member in a normal direction of the wiring substrate.

Inventors

• Hoshu Koichi
• SONG SHANCHE

Assignees

• 精工爱普生株式会社

Dates

Publication Date

20260505

Application Date

20240329

Priority Date

20230331

Claims (8)

1. 1. A liquid ejecting apparatus is characterized by comprising: an ejection head ejecting a liquid in accordance with driving of the piezoelectric element; A driving signal output circuit for outputting a driving signal for driving the piezoelectric element, and A basic drive signal output circuit that outputs a basic drive signal that is a basis of the drive signal, The drive signal output circuit includes: An integrated circuit to which the basic driving signal is input and which outputs a first control signal; A first switching element operated by the first control signal, and A wiring board provided with the integrated circuit and the first switching element, The first switching element includes: A first transistor chip; a first terminal, a second terminal, and a third terminal electrically connected to the first transistor chip, and A first molding member covering the first transistor chip, The conduction state of the second terminal and the third terminal is controlled according to the first control signal input to the first terminal, The first terminal, the second terminal, and the third terminal are provided only at positions overlapping the first molded member along a normal direction of the wiring substrate, The first molded part includes a direction indication mark indicating a direction of the first switching element, The first molded part is composed of an epoxy resin containing a polybutadiene containing a glycidyl group.
2. 2. The liquid ejection device of claim 1, wherein, The drive signal output circuit supplies the drive signals to 5000 or more piezoelectric elements.
3. 3. The liquid ejection device according to claim 1 or 2, wherein, The integrated circuit outputs a second control signal, The driving signal output circuit has a second switching element provided on the wiring board and operated by the second control signal, The second switching element includes: A second transistor chip; A fourth terminal, a fifth terminal, and a sixth terminal electrically connected to the second transistor chip, and A second molding member covering the second transistor chip, The conduction state of the fifth terminal and the sixth terminal is controlled according to the second control signal input to the fourth terminal, The fourth terminal, the fifth terminal, and the sixth terminal are provided only at positions overlapping the second molded member along a normal direction of the wiring substrate.
4. 4. The liquid ejection device of claim 3, wherein, The driving signal output circuit has a demodulation circuit, The integrated circuit outputs the first control signal and the second control signal corresponding to a modulation signal obtained by modulating the basic driving signal, The second terminal is electrically connected to the fifth terminal, The demodulation circuit demodulates a signal of a connection point at which the second terminal is electrically connected to the fifth terminal and outputs the demodulated signal as the driving signal.
5. 5. A print head for a printing device, comprising a print head, characterized by comprising: an ejection head ejecting a liquid in accordance with driving of the piezoelectric element, and A drive signal output circuit for outputting a drive signal for driving the piezoelectric element, The drive signal output circuit includes: an integrated circuit to which a basic driving signal as a basis of the driving signal is input, and which outputs a first control signal; A first switching element operated by the first control signal, and A wiring board provided with the integrated circuit and the first switching element, The first switching element includes: A first transistor chip; a first terminal, a second terminal, and a third terminal electrically connected to the first transistor chip, and A first molding member covering the first transistor chip, The conduction state of the second terminal and the third terminal is controlled according to the first control signal input to the first terminal, The first terminal, the second terminal, and the third terminal are provided only at positions overlapping the first molded member along a normal direction of the wiring substrate, The first molded part includes a direction indication mark indicating a direction of the first switching element, The first molded part is composed of an epoxy resin containing a polybutadiene containing a glycidyl group.
6. 6. The printhead of claim 5 wherein the printhead is configured to, The drive signal output circuit supplies the drive signals to 5000 or more piezoelectric elements.
7. 7. The printhead of claim 5 or 6 wherein, The integrated circuit outputs a second control signal, The driving signal output circuit has a second switching element provided on the wiring board and operated by the second control signal, The second switching element includes: A second transistor chip; A fourth terminal, a fifth terminal, and a sixth terminal electrically connected to the second transistor chip, and A second molding member covering the second transistor chip, The conduction states of the fifth terminal and the sixth terminal are controlled according to the second control signal input to the fourth terminal, The fourth terminal, the fifth terminal, and the sixth terminal are provided only at positions overlapping the second molded member along a normal direction of the wiring substrate.
8. 8. The printhead of claim 7 wherein the printhead is configured to, The driving signal output circuit has a demodulation circuit, The integrated circuit outputs the first control signal and the second control signal corresponding to a modulation signal obtained by modulating the basic driving signal, The second terminal is electrically connected to the fifth terminal, The demodulation circuit demodulates a signal of a connection point at which the second terminal is electrically connected to the fifth terminal and outputs the demodulated signal as the driving signal.

Description

Liquid ejecting apparatus and printhead Technical Field The present invention relates to a liquid ejecting apparatus and a printhead. Background In a liquid ejecting apparatus that ejects liquid to form an image or document on a medium, for example, a liquid ejecting apparatus using a piezoelectric element or the like is known. The piezoelectric elements are provided so as to correspond to the plurality of nozzles, and each of the piezoelectric elements operates in response to a driving signal to eject ink from the corresponding nozzle. Such a piezoelectric element is a capacitive load such as a capacitor in electrical terms, and a sufficient current needs to be supplied to operate the piezoelectric element. Therefore, the liquid ejecting apparatus includes a drive signal output circuit capable of supplying a sufficient current to drive the piezoelectric element. For example, patent document 1 discloses a liquid ejecting apparatus including a driving circuit that outputs a driving signal for driving a piezoelectric element. Patent document 1 Japanese patent application laid-open No. 2022-1170550 However, in the liquid ejecting apparatus described in patent document 1, there is a room for improvement in terms of protecting the driving circuit that outputs the driving signal from the ejected liquid. Disclosure of Invention One embodiment of the liquid ejecting apparatus according to the present invention includes: an ejection head ejecting a liquid in accordance with driving of the piezoelectric element; A driving signal output circuit for outputting a driving signal for driving the piezoelectric element, and A basic drive signal output circuit that outputs a basic drive signal that is a basis of the drive signal, The drive signal output circuit includes: An integrated circuit to which the basic driving signal is input and which outputs a first control signal; A first switching element operated by the first control signal, and A wiring board provided with the integrated circuit and the first switching element, The first switching element includes: A first transistor chip; a first terminal, a second terminal, and a third terminal electrically connected to the first transistor chip, and A first molding member covering the first transistor chip, The conduction states of the second terminal and the third terminal are controlled according to the first control signal input to the first terminal, The first terminal, the second terminal, and the third terminal are provided only at positions overlapping the first molded member along a normal direction of the wiring substrate. One embodiment of a printhead according to the present invention includes: an ejection head ejecting a liquid in accordance with driving of the piezoelectric element, and A drive signal output circuit for outputting a drive signal for driving the piezoelectric element, The drive signal output circuit includes: An integrated circuit to which a basic driving signal as a basis of the piezoelectric element is input, and which outputs a first control signal; A first switching element operated by the first control signal, and A wiring board provided with the integrated circuit and the first switching element, The first switching element includes: A first transistor chip; a first terminal, a second terminal, and a third terminal electrically connected to the first transistor chip, and A first molding member covering the first transistor chip, The conduction state of the second terminal and the third terminal is controlled according to the first control signal input to the first terminal, The first terminal, the second terminal, and the third terminal are provided only at positions overlapping the first molded member along a normal direction of the wiring substrate. Drawings Fig. 1 is a diagram showing a schematic configuration of a liquid ejecting apparatus. Fig. 2 is a diagram showing a functional configuration of the liquid ejecting apparatus. Fig. 3 is a diagram showing a schematic configuration of one of the ejection sections. Fig. 4 is a diagram showing a configuration of the drive signal output circuit. Fig. 5 is a diagram showing an example of the structure of the switching element. Fig. 6 is a diagram showing an example of the structure of the switching element. Fig. 7 is a diagram showing an example of the structure of the switching element. Fig. 8 is a diagram showing an example of the structure of the switching element. Fig. 9 is a diagram for explaining a configuration of the drive signal output circuit. Description of the reference numerals A liquid discharge device, a liquid container, a 10, a control unit, a 20, a print head, a 40, a conveying unit, a 41, a conveying motor, a 50, a driving circuit, 51a, a 51b, a driving signal output circuit, a 52, a reference voltage output circuit, a 55, a wiring substrate, a 60, a piezoelectric element, a 80, an ink container, a 100, a control circuit, a 110, a voltage output circuit, a 200, a discharg