IEC 62899-302-3:2021 pdf download

IEC 62899-302-3:2021 pdf download.Printed electronics – Part 302-3: Equipment – Inkjet – Imaging-based measurement of drop direction
1 Scope
This part of IEC 62899 specifies in-flight imaging methods for the measurement of the direction of ink drops jetted from inkjet print-heads using drop watchers. It does not apply to holographic or other interference techniques, or to any method assessing deposited ink drops. It is specific to drop-on-demand type inkjet print-heads (used in printed electronics equipment).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 62899-302-1, Printed electronics – Equipment – Inkjet – Imaging based measurement of jetting speed
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62899-302-1 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http://www.electropedia.org/ ISO Online browsing platform: available at http://www.iso.org/obp 3.1 inkjet nozzle plane flat outer surface of the inkjet print-head nozzle plate Note 1 to entry: The inkjet nozzle plane is defined for a drop-on-demand multi-nozzle print-head, or as otherwise specified by the print-head manufacturer or inkjet equipment integrator and stated in the measurement results. 3.2 nozzle row direction line in the inkjet nozzle plane passing through a row of nozzle exit centres Note 1 to entry: Typically along the length of the inkjet nozzle plane, or as otherwise specified by the print-head manufacturer or inkjet equipment integrator and stated in the measurement results. 3.3 reference direction n Note 1 to entry: Or as otherwise specified by the print-head manufacturer or inkjet equipment integrator and stated in the measurement results.3.4 measurement region 3-D space closest to the inkjet nozzle plane used for imaging of the jetted drops 3.5 drop trajectory direction of drop travel in 3-D in the measurement region Note 1 to entry: It can be measured with two drop watchers mounted with a wide angle between them simultaneously imaging jetted drops. 3.6 trajectory angles, pl. two orthogonal angles necessary to define the drop trajectory Note 1 to entry: The polar angle is relative to the reference direction; the azimuthal angle is relative to a specific direction within the nozzle plane, often assumed to be the nozzle row direction. 3.7 projected angle angle of the drop trajectory in the 2-D image plane of a single drop watcher Note 1 to entry: The projected angle does not correspond to the polar angle of the drop trajectory unless the a 3.8 reference speed speed of the drop along the reference direction 3.9 projected speed speed of the drop along the projected angle 3.10 absolute speed speed of the drop along the drop trajectory
4 Measurement methods
4.1 General The jetted drop direction shall be determined by using one of the following methods, unless there is an agreement between the user and the supplier. In that case the method is fully reported with the measurement results. All equipment engaged in the trajectory measurement shall have a carefully calibrated geometry. The image plane shall be aligned in a precisely orthogonal direction to the inkjet nozzle plane before the start of the measurement. 4.2 Process for projected angle using one double flash drop watcher (method 1) 1) Establish reliable jetting from the nozzle under study in the image measurement region. 2) Record the images and analyse the drop image position changes for the chosen double flash delay. 3) Report the projected angle, using the formula provided in A.2.1. 4) Report the conditions as indicated in Clause A.3.