CN-117799311-B - Drive circuit unit, head unit, and liquid ejecting apparatus

Abstract

The invention relates to a drive circuit unit, a head unit, and a liquid ejection device. Provided is a drive circuit unit capable of suppressing transmission of vibration generated by rotation of a fan to a drive circuit. The drive circuit unit generates a drive signal for driving a head, and includes a drive circuit for generating the drive signal, a first connector connected to the head, a first board on which the first connector is mounted, a fan for generating wind that blows to the drive circuit, and a second board on which the fan is mounted.

Inventors

• KONDO KEIICHIRO

Assignees

• 精工爱普生株式会社

Dates

Publication Date

20260505

Application Date

20230927

Priority Date

20220930

Claims (8)

1. 1. A drive circuit unit that generates a drive signal for driving a head, the drive circuit unit comprising: a driving circuit that generates the driving signal; A first connector connected to the head; a first board on which the first connector is mounted; a fan for generating wind blowing to the driving circuit, and A second substrate on which the fan is mounted, The first substrate and the second substrate are connected in a board-to-board manner via a floating connector.
2. 2. The drive circuit unit according to claim 1, wherein, The fan protrudes from the second substrate toward the driving circuit.
3. 3. The drive circuit unit according to claim 1, wherein, The fan is operated by electric power supplied from the first substrate through a cable without passing through the second substrate.
4. 4. The drive circuit unit according to claim 1, wherein, The fan is mounted on the second substrate via a floating connector.
5. 5. The driving circuit unit according to claim 4, wherein, The fan is secured to the second substrate only by a floating connector with the second substrate.
6. 6. The drive circuit unit according to claim 1, wherein, The second substrate has a right angle connector connected to a communication cable at an end opposite to the fan among the ends of the second substrate.
7. 7. A head unit, comprising: Head and A drive circuit unit generating a drive signal for driving the head, The drive circuit unit includes: a driving circuit that generates the driving signal; A first connector connected to the head; a first board on which the first connector is mounted; a fan for generating wind blowing to the driving circuit, and A second substrate on which the fan is mounted, The first substrate and the second substrate are connected in a board-to-board manner via a floating connector.
8. 8. A liquid ejecting apparatus is characterized by comprising: a conveying unit that conveys a medium; Head and A drive circuit unit generating a drive signal for driving the head, The drive circuit unit includes: a driving circuit that generates the driving signal; A first connector connected to the head; a first board on which the first connector is mounted; a fan for generating wind blowing to the driving circuit, and A second substrate on which the fan is mounted, The first substrate and the second substrate are connected in a board-to-board manner via a floating connector.

Description

Drive circuit unit, head unit, and liquid ejecting apparatus Technical Field The invention relates to a drive circuit unit, a head unit, and a liquid ejection device. Background Liquid ejecting apparatuses that eject liquid onto a medium to form an image on the medium have been studied and developed. In contrast, a liquid ejecting apparatus that drives a piezoelectric element such as a pressure-sensitive element by a signal from a drive circuit provided on a head is known (see patent document 1). Patent document 1 Japanese patent application laid-open No. 2020-138356 Here, the liquid ejecting apparatus described in patent document 1 drives a piezoelectric element by supplying a drive signal to the piezoelectric element provided in a head that ejects liquid, and ejects liquid in an amount corresponding to the driving of the piezoelectric element. Therefore, the liquid ejecting apparatus includes a drive circuit that generates a drive signal. In many of such liquid ejecting apparatuses, a substrate on which a drive circuit is mounted is disposed immediately above a head. This is because, when the substrate is disposed directly above the head, it is possible to suppress a decrease in ejection stability due to an increase in inductance of a transmission channel that transmits a signal that is the basis of image data, in relation to an increase in length of the transmission channel. In addition, in the case where the versatility of the liquid ejecting apparatus is to be improved, there are many cases where the liquid ejecting apparatus is provided with a line head constituted by a plurality of heads. In this case, the direction in which the substrate is enlarged is limited by the distance between the heads, and is easily the height direction. For this reason, as described above, in the liquid ejecting apparatus, a substrate on which a drive circuit is mounted is often arranged directly above the head. Here, the driving circuit is composed of a heat generating component such as an integrated circuit, a field effect transistor, or a coil. As a result, the driving circuit is heated to a high temperature during driving. As a method for effectively cooling such a driving circuit, a cooling fan is often provided for each driving circuit in a liquid ejecting apparatus. However, in this case, in the liquid ejecting apparatus, vibration generated by rotation of the fan may be transmitted to the driving circuit, and as a result, malfunction may occur. Disclosure of Invention One aspect of the drive circuit unit according to the present disclosure is a drive circuit unit that generates a drive signal for driving a head, the drive circuit unit including a drive circuit that generates the drive signal, a first connector connected to the head, a first board on which the first connector is mounted, a fan that generates wind that blows to the drive circuit, and a second board on which the fan is mounted. The head unit according to the present disclosure includes a head, and a driving circuit unit that generates a driving signal for driving the head, the driving circuit unit including a driving circuit that generates the driving signal, a first connector connected to the head, a first board on which the first connector is mounted, a fan that generates wind that blows to the driving circuit, and a second board on which the fan is mounted. The liquid ejecting apparatus according to the present disclosure includes a transport unit that transports a medium, a head, and a drive circuit unit that generates a drive signal for driving the head, the drive circuit unit including a drive circuit that generates the drive signal, a first connector connected to the head, a first substrate on which the first connector is mounted, a fan that generates wind that blows against the drive circuit, and a second substrate on which the fan is mounted. Drawings Fig. 1 is a schematic diagram of a liquid ejecting apparatus. Fig. 2 is a schematic diagram showing the configuration of the discharge unit. Fig. 3 is a diagram showing an example of a signal waveform of the driving signal COMA, COMB, COMC. Fig. 4 is a diagram showing a functional configuration of the drive signal selection circuit. Fig. 5 is a diagram showing an example of decoded content in a decoder. Fig. 6 is a diagram showing an example of the configuration of the selection circuit. Fig. 7 is a diagram for explaining an operation of the drive signal selection circuit. Fig. 8 is a diagram showing a structure of the liquid ejecting module. Fig. 9 is a diagram showing an example of the structure of the ejection module. Fig. 10 is a cross-sectional view of the ejection module taken along line a-a shown in fig. 9. Fig. 11 is a perspective view showing an example of the structure of the head driving module 10. Fig. 12 is a perspective view of the head driving module 10 shown in fig. 11 viewed from another direction. Fig. 13 is a bottom view of the head drive module 10 shown in fig. 11 when viewed