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Imaging apparatus for fully automatic screen printer

a fully automatic, screen printing technology, applied in the direction of instruments, television systems, television system scanning details, etc., can solve the problems of low precision, low speed, difficult to adapt to the development of smt production with high density, large output and high precision, etc., to improve the quality of reference marks and reduce the relative movement of printed circuit boards and screens.

Inactive Publication Date: 2011-09-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an imaging apparatus with a compact structure that allows for easy adjustment of the light path and the acquisition of images from the same position in both upward and downward directions. The apparatus is used for image acquiring during screen printing and solder-paste printing processes. The technical solution includes a stacked light source, beamsplitter, optical reflector, imaging lens, and image sensor. The optical reflector has both an upward and downward reflection plane, and the imaging lens and image sensor are positioned behind the reflector. The apparatus can form a T-shaped or L-shaped structure, and the angles of the light-splitting planes of the beamsplitter are 45°. The beamsplitter may be formed of prisms or light-splitting plates. The image sensor may be a CCD or CMOS camera. The apparatus also includes a ring light source for providing lateral illumination for the printed circuit board. The light source and image sensor are connected to the image acquiring control and processing device for controlling the switching of the light source and acquiring the images. The acquired image video signals are converted to digital signals by the image acquiring card.

Problems solved by technology

However, this method is of the defects including low precision, low speed and even that there is no positioning hole due to the different positioning aperture of different printed circuit board.
Therefore, this method is difficult to adapt to the development of the SMT production with high density, large output and high precision, and will fall into disuse gradually.
Currently, in the SMT product line of the printed circuit board with high density, most of the defects come from the printing faults of the solder paste.
The manual inspection may have the problems including strong subjectivity, poor reproducibility, misjudgment and overlook due to vision fatigue, etc.
The manual inspection is hardly qualified for the inspection requirement of SMT product line.
However, acquiring the images at different time may result in that the image acquiring positions of the lower image and the upper image are inconsistent; and the dimension of the imaging apparatus in the direction of the upward and downward light path is too large, so that the distance between the printed circuit board and the screen is accordingly large when acquiring the image.

Method used

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  • Imaging apparatus for fully automatic screen printer
  • Imaging apparatus for fully automatic screen printer
  • Imaging apparatus for fully automatic screen printer

Examples

Experimental program
Comparison scheme
Effect test

embodiment 1

A T-type Imaging Apparatus with Two Lenses for Fully Automatic Screen Printer

[0043]As shown in FIGS. 1, 2, 3, 4 and 5, the imaging apparatus for reference mark measurement and inspection of the solder-paste printing, includes a first reflector 1, a second reflector 2, a low-angle ring light source 3, a first beamsplitter 4, a second beamsplitter 5, a first LED light source 6, a second LED light source 7, a first imaging lens 8, a second imaging lens 10, a image sensor 9 and a second image sensor 10. The two stacked optical reflectors 1, 2 and the two stacked LED light sources 6, 7 are correspondingly disposed on two opposite sides of the two stacked beamsplitters 4, 5. The two stacked imaging lens 8, 10 are disposed on another side of the beamsplitters 4, 5 different from that of the optical reflectors and the light sources. The optical axes of the two stacked image sensors 8, 10 are orthogonal to that of the LED light sources 6, 7. The angles of the light-splitting planes of the tw...

embodiment 2

A L-type Imaging Apparatus with Two Lenses for Fully Automatic Screen Printer

[0048]As shown in FIG. 7, the two stacked reflectors 1, 2 and the two stacked imaging lenses 8, 10 are disposed on two opposite sides of the two stacked beamsplitters 4, 5, and the two stacked LED light sources 6, 7 are disposed on another side of the two stacked beamsplitters 4, 5 different from that of the reflectors and the imaging lenses, so that the imaging apparatus forms a L-shaped structure. The other features of the embodiment 2 are the same as that of the embodiment 1 as described above. The optical axes of the first imaging lens 8 and the second imaging lens 10 are both orthogonal to that of the first LED light source 6 and the second LED light source 7. The angles of the light-splitting planes of the two beamsplitters 4, 5 with respect to the axes of the two imaging lenses 8, 10 and the axes of the two LED light sources 6, 7 are both 45°.

[0049]The light emitted from the first LED light source 6 ...

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PUM

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Abstract

An imaging apparatus for fully automatic screen printer including two stacked light sources, two stacked beamsplitters, two stacked optical reflectors, two stacked imaging lens and two stacked image sensors, wherein the two stacked optical reflectors and the two stacked light sources are correspondingly disposed on two different sides of the two beamsplitters, the two stacked imaging lens are disposed on another side of the beamsplitters different from that of the optical reflectors and the light sources, the two stacked image sensors are disposed behind the imaging lens; the optical reflectors are provided with an upward reflection plane and a downward reflection plane, the optical axes of the imaging lenses are orthogonal to that of the light sources. The imaging apparatus is of two independent optical paths which capture the image of the printed circuit board and that of the screen respectively. Furthermore, the imaging apparatus is of compact structure, high acquiring speed and optical paths easy to be adjusted.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a divisional of U.S. patent application Ser. No. 11 / 836,497, filed Aug. 9, 2007.BACKGROUND OF THE INVENTION[0002]The present invention relates to an imaging apparatus, specially relates to an imaging apparatus for the reference mark measurement and inspecting the paste solder printing; more specially relates to an imaging apparatus for the reference mark measurement of the screen and the printed circuit board during the paste solder printing of the printed circuit board of the screen printing process, and for the inspection of the screen and the printed circuit board during the paste solder printing.[0003]During the paste solder printing of the printed circuit board of the screen printing process, in order to apply the solder paste to the printed circuit board accurately, the portions of the printed circuit board desired to be printed are required to be corresponding to the holes of the screen. Reference mark measuremen...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04N5/335H04N5/225H04N25/00
CPCG01N21/8806G01N21/956H05K2201/09918H05K3/0008H05K3/1216H05K1/0269
Inventor ZHANG, XIANMINKUANG, YONGCONGTANG, YUEQUAN
Owner SOUTH CHINA UNIV OF TECH