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Liquid ejecting apparatus, print head unit, and drive substrate

A liquid and substrate technology, applied in printing devices, printing, etc., can solve the problems of switching element switching loss and heat generation, additional heat dissipation components, and difficulty in increasing size, and achieve the effect of simple structure and stable operation

Active Publication Date: 2015-03-18
SEIKO EPSON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When actually considered based on the driving signal for ejecting ink, since the modulation signal is a signal of the order of megahertz, the digital amplifier also needs to be driven at the order of megahertz. Problems of heat generation due to switching loss of switching elements
[0006] In addition, there is a demand to reduce the size of the droplet ejection device, and some kind of heat dissipation countermeasure is required, but there is a problem that it is difficult to add a dedicated heat dissipation member and increase the size of the device.

Method used

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  • Liquid ejecting apparatus, print head unit, and drive substrate
  • Liquid ejecting apparatus, print head unit, and drive substrate
  • Liquid ejecting apparatus, print head unit, and drive substrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0061] (Outline of liquid ejection device)

[0062] figure 1 It is a perspective view showing the outline of the liquid ejection device according to Embodiment 1. First, an overview of the printer 100 as the liquid ejection device according to the present embodiment will be described.

[0063] The printer 100 is an inkjet printer that prints on paper 1 as a print medium delivered from the rear paper feed tray 2 by the print head unit 20 and then unloads the paper 1 to the front paper output tray 6 side. In the following description, the direction in which the paper 1 is conveyed is referred to as the conveyance direction 4 , and the direction intersecting the conveyance direction (the width direction of the paper 1 ) is described as the paper width direction 5 . In addition, in the transport direction 4 , the paper feed tray 2 side is referred to as the upstream side, and the delivery (front) side is referred to as the downstream side.

[0064] The print head unit 20 is equ...

Deformed example 1

[0240] use Figure 13 to explain.

[0241] In Embodiment 1, a case was described in which a glass epoxy substrate is used for the main substrate 50 , but it is not limited to this configuration, and any substrate may be used as long as a through hole can be formed. For example, ceramic substrates, Teflon (registered trademark) substrates, glass / composite material substrates, paper epoxy resin substrates, flexible substrates, and the like can also be used.

[0242] In addition, it is not limited to double-sided substrates, but can also be applied to multilayer substrates. In this case, it is not necessary for the through hole to penetrate from the front surface to the back surface. For example, the through hole on the front surface may be connected to the back surface through another through hole through the (solid) pattern of the intermediate layer. In other words, it is only necessary to form a path capable of transferring heat from the front surface to the rear surface.

...

Deformed example 2

[0246] use Figure 16 to explain.

[0247] In Embodiment 1 and Modification 1, the structure in which the drive circuit 44 is mounted on the main substrate 50 has been described, but it is not limited to this structure. If a double-sided through-hole substrate is used, a separate structure (substrate) is also possible. . For example, it can also be assembled with figure 1The structure of the print head unit 20 independent drive substrate (on which the drive circuit 44 is mounted). In the case of this structure, the drive board is attached to the metal member of the print head unit 20 . Alternatively, a structure in which the circuit of the head substrate 15 is also mounted on the drive substrate and integrated into the print head unit 20 may be used.

[0248] Even with these configurations, since the above-described effect of heat dissipation can be obtained, the same effects as those of the above-described embodiment and modifications can be obtained.

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Abstract

A plurality of THs are formed in the main substrate (drive substrate) in a region in which switching transistors are disposed. In addition, a solid pattern obtained by expanding an interconnection pattern at the periphery of the transistors is formed to surround the transistors. In addition, a solid pattern for heat dissipation is also formed on a rear surface to add a heat dissipation structure for a frame. According to this, it is possible to provide a liquid ejecting apparatus which has a simple configuration and which realizes operation stability without using a dedicated heat dissipation component.

Description

technical field [0001] The present invention relates to a liquid ejection device, a print head unit including a discharge unit included in the liquid discharge device, and a drive substrate for driving the discharge unit. Background technique [0002] It is known to use piezoelectric elements as actuators for ejecting ink droplets in liquid ejection devices such as inkjet printers. In order to drive the piezoelectric element, it is necessary to apply a drive signal having a vibration width of several tens of volts at the peak. Conventionally, an analog amplifier with push-pull connection of bipolar transistors is mounted on the drive board that generates the drive signal. However, bipolar transistors generate heat when the collector current increases. In a liquid ejection device that applies a large current and high voltage between the emitter connectors due to a capacitive load, the power conversion efficiency is poor and the amount of heat generated is large, so there are...

Claims

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Application Information

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IPC IPC(8): B41J2/01B41J29/38
CPCB41J2/04573B41J2/04581B41J2/04541B41J2/04588B41J2/01B41J29/38
Inventor 樫村透杉田博司
Owner SEIKO EPSON CORP
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