Liquid detection device, liquid container using the same and liquid ejection apparatus

Abstract

The present invention provides a liquid detection device which can be simply and reliably sealed when it is mounted to a container main body, the liquid detection device can not be influenced by fluctuation of ink and the air bladder, and the vibration attenuation of the vibration plate of the liquid detection device caused by a reflect wave is small. The liquid detection device is accommodated in a sensor accommodating portion (110) formed in a liquid container (101) and detects the liquid in the liquid container (101) using a piezoelectric element (234), the liquid container (101) stores liquid. When a wavelength of a vibration wave to be emitted from the piezoelectric element (234) is lambda, a distance H from a rear surface of a vibration wave emitting surface of the piezoelectric element (234) to a wall surface (302) facing the rear surface is defined to satisfy the following relation: (n x lambda / 2 -lambda / 4 -lambda / 8) <= H <= (n x lambda / 2 - lambda / 4 + lambda / 8), wherein, n = 1, 2, 3, ... .

Description

technical field [0001] The present invention relates to a liquid detection device, and more particularly to a liquid detection device used in a liquid ejection device such as an inkjet recording device and mainly for detecting the remaining amount of ink. Background technique [0002] As a representative example of such a liquid ejecting device, there is an ink jet recording device having an ink jet recording head for image recording. As other liquid jetting devices, for example, a device having a pigment jet head used in the manufacture of color filters such as liquid crystal displays; A device with an electrode material (conductive paste) ejection head used in the process; a device with a bioorganic substance ejection head used in the manufacture of a biochip; a device with a sample ejection head as a precision pipette, etc. [0003] In an inkjet recording apparatus that is a representative example of a liquid ejecting apparatus, an inkjet recording head having a pressure...

AI Technical Summary

Problems solved by technology

However, due to the structure in which the liquid detection device is bonded to the edge of the opening, it is difficult to ensure sealing when the dimensions vary.

In addition, if it is directly bonded to the edge of the opening of the container body or the edge of the opening of the module, it is easily affected by ink fluctuations and air bubbles in the ink, which may cause false detection

[0011] Generally, in an ink remaining amount detection container having a liquid detecting device including the piezoelectric element and a vibrating plate, the upper sides of the piezoelectric element and the vibrating plate are covered by a unit cover, and if the cover is connected to the piezoelectric If the distance between the element and the vibrating plate is too close, the counter electromotive force signal will be attenuated by the reflected wave from the cover, and the remaining amount of ink will not be accurately detected.

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