JPS5995149A - Electrostatic marking apparatus of integrated circuit package - Google Patents

Abstract

PURPOSE:To perform marking so that printing does not become blurred by the surface smoothness of an IC-package, by projecting chargeable ink particles to an IC-package side while charging and deflecting the same. CONSTITUTION:When an ink head assembly 2 is excited by ultrasonic waves from quartz 3, F-numbers/sec of small ink droplets 16 are projected from a nozzle in succession in synchronous relation to exciting frequency F. The small droplets 16 are charged by a charging plate 4 to which a video signal is applied but, when the exciting frequency is too high, charging can not be performed well and, therefore, F/2 is lowered in order to charge the small droplets 16 at every other droplet. The deflection in a Y-axis direction is performed by a deflection electrode 8 and because only necessary dots are charged by a character pattern and the other dots are not charged, non-charged droplets are blocked by a barrier plate 12 and not projected to the surface of the IC-package 9. The displacement in an X-axis direction is performed by the movement of an ink head to a traverse direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an electrostatic marking device for an integrated circuit package that uses an electrostatic inkjet blink method to mark the surface of an integrated circuit package.

[Technical background of the invention and its problems]

Currently, markings for IC (integrated circuits) and arm packages include:
It uses a method of transferring ink using a stamp. However, this method has the following drawbacks (a) to (c). (() Due to the unevenness of the IC and motherboard, the contact of the stamp may be incomplete and the print may be rubbed off. (=) The stamp may be mechanically abraded.

f Now, a stamp must be made and replaced every time the printing or turn is changed.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and it is possible to mark without using a stamp or applying mechanical pressure to the IC notch, and without blurring the printed characters due to the smooth surface of the IC notch. What's more, it's an integrated circuit that allows printing to be easily changed using a video signal? The present invention aims to provide a Tsugaji electrostatic marking device.

[Summary of the invention]

In order to achieve the above object, the present invention has an ink head assembly, which is an ink container, excited by ultrasonic waves etc. from a crystal, and a chain of ink droplets (particles) synchronized with the excitation frequency is ejected from a nozzle. . This droplet is charged and printed at a charging rate to which a video signal is applied. The above droplet is a charging plate that charges only the necessary dots according to the printing pattern, leaving the others alone.
A shield is used to prevent electricity from coming onto the surface of the IC/4 y-cage.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is an oscillator, 2 is an ink head assembly, 3 is a crystal,
4 is a charging plate, and 5 is a character generation circuit, which generates a video signal 7 based on a character input 6. 8 is a deflection plate, 9 is an IC package, 10 is a power source that generates high voltage such as a triangular wave, 11 is a gutter, 12 is a shielding plate, 13 is an ink tube, 14 is an ink tube, and 15 is a pump.

In FIG. 1, when the ink head assembly 2 is excited by ultrasonic waves from the crystal 3, the excitation frequency F [Hz]
Ic The synchronized droplet 16 becomes a continuous stream, and the nozzle (X
(gourd)) F droplets 16 are ejected every second. The size of the spot marked on the IC package 9 is Y (mm
:) and is formed by a dot matrix of one character "Z6XZb". The droplets are charged at a charging rate of 4 to which a video signal 7 is applied, but for better control of the droplets, every other droplet is charged at F/2 (Hz).
) is written. That is, if the excitation frequency F [Hz] is too high, it will not be possible to charge properly at charging rate 4, so in order to charge slowly, the frequency is set to F/2.
I'm lowering it. All deflection in the Y-axis direction is performed by the deflection electrode 8, and as shown in FIG. Because I won't let you
It is blocked by the shielding plate 12 and does not come out onto the surface of the IC package 9. The X-axis direction is performed by moving the ink head in the lateral direction.

As a specific example, the following values can be set. p=5
6 kXX=0.064, Y=0.254, Za=
9. zb=11゜ [Effects of the Invention] According to the present invention, by using the electrostatic marking method, there is no need to use a stamp as in the past, and IC/IC packages can be printed without applying stock pressure to IC packages. The smoothness of the surface of the package allows for printing without blurring, and furthermore, the printing can be easily changed using a video signal.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a print i! obtained by the same structure. It is a figure showing a turn. 1... Oscillator, 2... Ink head assembly, 3
...Crystal, 4...Charging plate, 5...
Character generation circuit, 8... Deflection plate, 9... IC/
? Tsugaji, 1o... High voltage power supply, 12... Shielding plate, 14... Ink fountain, 15... Pump, 16...
- Ink droplets (particles). Figure 1 Figure 2

Claims (1)

[Claims] an ink head assembly for ejecting chargeable ink particles toward an integrated circuit chip; a charging electrode for charging the particles in accordance with an image signal; a deflection electrode for deflecting the charged particles; and a charging electrode for deflecting the charged particles. 1. An electrostatic marking device for an integrated circuit package, comprising: means for removing uncharged ink particles before the integrated circuit package.