1. Technical Field
The present disclosure relates to screen printing technologies and particularly to a high precision screen printing device.
2. Description of Related Art
Screen printing can be used to print desired patterns on the optics. However, the precision of the screen printing often fails to meet of the precision requirements of the optics.
Therefore, it is desirable to provide a screen printing device, which can overcome the above-mentioned problems.
Many aspects of the present disclosure can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure.
Embodiments of the present disclosure will now be described in detail with reference to the drawings.
Referring to
As such, the precision of the screen printing device 10 is controlled with in ±0.1 mm, which can meet the precision requirements of optics.
The optics 20 can be a circular sapphire substrate. The open pattern 210 transfer printable light-shielding materials, such as ink, on the corresponding optic 20 as a light-shielding region on the optic 20.
In the embodiment, the number of the blind holes 120 is six and arranged in a 2×3 array. The depth of the blind hole 120 is slightly smaller than the height of the optic 20, and is about 0.0508 mm. As such, the optic 20 can slightly protrude out the supporting surface 110. Thus, the optic 20 can gaplessly contact the stencil 20 so that the light-shielding region can have sharp edges.
The supporting base 10 defines a number of through holes 130 corresponding to the blind holes 120. Each through hole 130 has a diameter smaller than the diameter of the corresponding blind hole 120 and aligns with the corresponding blind hole 120. Each through hole 130 communicates the corresponding blind hole 120 with an air pump to absorb the corresponding optic 20 in the blind hole 120.
In the embodiment, the gap between the boundary of each blind hole 120 and the optic 20 is less than 0.0508 mm.
The stencil 200 is substantially rectangular. Each open pattern 210 is a circular hole.
The imaging alignment device 300 includes an image capture device 310 and an actuator 320. The image capture device 310 is fixed in relative to the supporting base 100 and configured for capturing the images. The actuator 320 is connected to the image capture device 310 and the stencil 200 and configured to analyze the images and reposition the stencil 200 based upon the analyzing results.
In practice, the imaging alignment device 300, the stencil 200, and the supporting base 100 can be pre-aligned using other methods, such as visual inspection.
The number and arrangement of the blind holes 120 are not limited to this embodiment, and can be set as desired. The number and arrangement of the through holes 130 and the open patterns 210 should be change correspondingly. For example, in another embodiment, only one blind hole, one through hole and on open pattern can be employed.
The number and arrangement of the marks 220 are also not limited by this embodiment.
In other embodiment, only three or more masks can be employed and arranged in other forms.
It will be understood that the above particular embodiments are shown and described by way of illustration only. The principles and the features of the present disclosure may be employed in various and numerous embodiment thereof without departing from the scope of the disclosure as claimed. The above-described embodiments illustrate the possible scope of the disclosure but do not restrict the scope of the disclosure.
Number | Date | Country | Kind |
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101128369 | Aug 2012 | TW | national |