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Droplet inspection method and device

A liquid droplet and liquid spray port technology, applied in the droplet inspection method and device field of dripping droplets, can solve the problems of unstable brightness, cost increase, image abnormality, etc., and achieve the effect of rapid exposure of dripping images

Inactive Publication Date: 2019-03-08
ALL RING TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] It is known that when the liquid droplet is ejected by the ejection unit, the LED light source and the CCD camera are turned on synchronously with the same signal to capture the image of the falling liquid droplet. However, after the general LED light source is turned on, there will be a delay It takes time to reach the working brightness. Even if high-standard high-power LEDs are used, the brightness may be unstable in the front stage, so that the obtained images are abnormal; in addition, these cameras need to Perform fast exposure, and the shortest exposure time depends on the shutter speed of the camera itself. To achieve the purpose of fast exposure, you need to use a high-spec camera with a faster shutter speed, which increases the cost

Method used

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  • Droplet inspection method and device

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Embodiment Construction

[0029] see figure 1 , the droplet inspection method in the embodiment of the present invention can be implemented using the device shown in the figure, including:

[0030] A liquid ejection head 1 is provided with a plurality of liquid ejection ports 11, and the liquid droplets F are discharged from the liquid ejection ports 11 and continue to drop until they land on the substrate P or the collection box C;

[0031] A light source 2, which is composed of LED (light emitting diode, light emitting diode), is located close to the liquid ejection port 11 of the liquid ejection head 1, and illuminates the dripping liquid droplets F;

[0032] An image taking device 3, which is a CCD (charge coupled device, charge coupled device) camera, corresponding to the light source 2, for photographing the state of the droplet F in the drop track;

[0033] A controller 4, capable of outputting signals to control the opening and closing of the liquid ejection head 1, the light source 2 and the ...

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Abstract

The invention relates to a liquid drop viewing method and apparatus. The method is used for viewing a dripping liquid drop discharged from a liquid spraying port. The method comprises: in a manner that first and second signals are utilized to start a light source and then a capturing device, performing capturing when the brightness of the LED light source is stable. Under the situation that exposure of the capturing device is started, the light source is closed first, and the time difference from when the capturing device is started till the light source is closed is set as exposure time. Without using a high-standard LED light source and a capturing device, a good dripping image of a liquid drop is obtained and fast exposure of the capturing device is achieved.

Description

technical field [0001] The present invention relates to an inspecting method and its device, in particular to a liquid drop inspecting method and its device for inspecting dripping liquid droplets discharged from a liquid ejection port. Background technique [0002] The known inkjet coating technology is to deposit the droplets discharged from the nozzles on substrates such as paper, film, circuit boards, etc. to form patterns, and in order to ensure the quality of pattern formation on substrates, when performing coating operations Previously, the inspection of liquid droplets was carried out, using the camera to take images of the dripping droplets discharged from the liquid nozzle, and several images can be combined to evaluate the number, size, speed, trajectory, etc. of the droplets Whether the nozzle is good or not; China Taiwan Patent Publication No. 201043474 "Calibration Method of Inkjet Head Unit and Inkjet Coating Method" discloses a method of shooting the ejection...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/235
Inventor 陈志钧刘恒惠
Owner ALL RING TECH CO LTD
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