CN103216763A - Back lighting method for SMT (Surface Mounting Technology) screen by scanner light box - Google Patents
Back lighting method for SMT (Surface Mounting Technology) screen by scanner light box Download PDFInfo
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- CN103216763A CN103216763A CN2012100158942A CN201210015894A CN103216763A CN 103216763 A CN103216763 A CN 103216763A CN 2012100158942 A CN2012100158942 A CN 2012100158942A CN 201210015894 A CN201210015894 A CN 201210015894A CN 103216763 A CN103216763 A CN 103216763A
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Abstract
The invention relates to a back lighting method for an SMT (Surface Mounting Technology) screen by a scanner light box, which comprises the steps of arranging multiple LED (Light-Emitting Diode) light strips in the scanner light box to be used as a lighting source and arranging a layer of boss membrane on optical glass of the scanner light box, wherein when the SMT screen is scanned, light rays emitted from the LED lights irradiate on the boss membrane at first and become uniform after passing through the nonopaque boss membrane, and then the uniform light rays irradiate on the back of the to-be-scanned SMT screen.
Description
Technical field
The present invention relates to a kind of back lighting method of scanner lamp box of the SMT of being used for web plate detection.
Background technology
Current, surface installation technique (SMT) is widely used in being connected between element pasted on surface (SMC) and surface mount device (SMD) and the printing board PCB.In the SMT technological process, the welding quality of the processing precision direct influence SMT of SMT web plate.Because may there be various defectives in the SMT web plate, for example perforate is excessive, perforate is too small, the hole is biasedly moved, porous and few hole etc., therefore is necessary very much the SMT web plate is detected.
SMT web plate scanner is a kind of advantages of simplicity and high efficiency web plate defect detecting device.This scanner is remarkable to the detection effect in above-mentioned various web plate defectives especially porous/few hole, and its cost is lower and simple to operate.In production testing, the use of SMT web plate scanner can reduce artificial factor, and provides advanced detection means statistics to export examining report accurately, guarantees whole testing process stable and controllable.SMT web plate scanner is used for the inspection of semifinished product link that the SMT web plate is produced, and sweep object mainly is the web plate for stretch tight the net or the net that do not stretch tight.Because web plate thickness to be scanned is generally 0.12mm or 0.13mmm, when with scanner device web plate being scanned, the scan image of acquisition has irregular shade and has a large amount of noises.
Therefore, need a kind of scanner lamp box back lighting method new, that can improve the scan image quality.
Summary of the invention
The present invention is intended to solve when the SMT web plate scan scan image to be had more than irregular shade, the noise and problem such as scan image is smudgy.
For solving the problems of the technologies described above, concrete technical scheme of the present invention is:
Many LED lamp bands are set as lighting source in the scanner lamp box, and one deck boss film is set on the optical glass of scanner lamp box.Wherein, when scanning SMT web plate, the light that the LED lamp emits at first is radiated on boss's film, and light is through becoming behind boss's film of printing opacity evenly, and light shines the back side of SMT web plate to be scanned at last uniformly.Preferably, many LED lamp bands equidistantly are arranged on the upper cover plate inner surface of scanner lamp box thick and fast.
After lamp box of the present invention increased lighting source, the scan image that is obtained when carrying out the scanning of SMT web plate was more clear, shadow-free and noise are few.
Description of drawings
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Fig. 1 is a lamp band schematic layout pattern according to an embodiment of the invention;
Fig. 2 is a LED lamp band light path schematic diagram according to an embodiment of the invention; And
Fig. 3 is an Illuminative for sign schematic diagram according to an embodiment of the invention.
The specific embodiment
Below preferred embodiment of the present invention will be discussed.But it will be appreciated by those skilled in the art that herein detailed description is not as limiting the scope of the invention.The present invention also can be achieved by modification or other equivalent way of these embodiment.
In one embodiment of the invention, the scanning fluorescent tube that carries except scanner also increases lighting source thin web plate is thrown light in the lamp box of scanner.In one example, LED lamp band is set as lighting source in lamp box.Why selecting the LED lamp as lighting source, is because LED has power saving, heating advantage such as low.Preferably, many LED lamp bands are arranged on the upper cover plate inner surface of scanner lamp box regularly.
Fig. 1 shows an exemplary lamp band layout of the present invention.As shown in the figure, on the equidistant inner surface attached to upper cover plate thick and fast of many LED lamp bands.In this example, every lamp band is formed by a plurality of LED lamp groups of vertical arrangement, and wherein per 3 transversely arranged LED lamps are one group, equidistant dense arrangement between the lamp band.In another example, even as far as possible in order to make light, each LED lamp size preferably is no more than 3 * 3mm.For example, the size of each LED lamp can only be 3 * 3mm.In the present embodiment, improve swept brilliance, under the dual-radiation of scanner scanning fluorescent tube and LED lamp band, solved the problem that scan image has irregular shade effectively by increase led light source at the back side of web plate to be scanned.
In SMT web plate scanning process, when intensive evenly distributed LED light irradiation is on web plate to be scanned, there is not shade on the image that scanning obtains.But,, so may have a large amount of noises on the scan image because the LED lamp is a spot light one by one.In order to eliminate the noise on the scan image, in one embodiment of the invention, on the optical glass of lamp box, be provided with one deck boss film.This layer boss film as thin as a wafer.In one example, this layer boss film is attached on the outer surface of optical flat, as shown in Figure 3.
Fig. 2 shows LED lamp band light path according to an embodiment of the invention.As shown in the figure, the LED lamp is a spot light one by one, and its light that emits at first is radiated on boss's film, becomes even through light behind boss's film of printing opacity, this uniform light shines the back side of web plate to be scanned at last, thereby noise significantly reduces on the image that feasible scanning obtains.Test result to different colours boss film in experiment shows, selects the better effects if of green boss's film for use.
Like this, under the dual-radiation of scanner scanning fluorescent tube and LED lamp band, SMT web plate clear picture, shadow-free and noise that scanning obtains are few.
Claims (6)
1. SMT web plate scanner lamp box back lighting method, be included in and many LED lamp bands be set in the scanner lamp box as lighting source, and one deck boss film is set on the optical glass of scanner lamp box, wherein, when scanning SMT web plate, the light that the LED lamp emits at first is radiated on boss's film, and light is through becoming behind boss's film of printing opacity evenly, and light shines the back side of SMT web plate to be scanned then uniformly.
2. the method for claim 1 is characterized in that, many LED lamp bands is set in the scanner lamp box comprises many LED lamp bands equidistantly are arranged on the upper cover plate inner surface of scanner lamp box thick and fast.
3. method as claimed in claim 2 is characterized in that, per 3 transversely arranged LED lamps are one group, and a plurality of LED lamp groups are vertically arranged and formed the lamp band, equidistant dense arrangement between lamp band and the lamp band.
4. method as claimed in claim 3 is characterized in that the size of each LED lamp is 3 * 3mm.
5. the method for claim 1 is characterized in that, comprises this layer boss film is attached on the outer surface of optical flat in that one deck boss film is set on the optical glass.
6. the method for claim 1 is characterized in that, described boss's film is green boss's film.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100158942A CN103216763A (en) | 2012-01-19 | 2012-01-19 | Back lighting method for SMT (Surface Mounting Technology) screen by scanner light box |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100158942A CN103216763A (en) | 2012-01-19 | 2012-01-19 | Back lighting method for SMT (Surface Mounting Technology) screen by scanner light box |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103216763A true CN103216763A (en) | 2013-07-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100158942A Pending CN103216763A (en) | 2012-01-19 | 2012-01-19 | Back lighting method for SMT (Surface Mounting Technology) screen by scanner light box |
Country Status (1)
| Country | Link |
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| CN (1) | CN103216763A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH112598A (en) * | 1997-06-12 | 1999-01-06 | Shimu:Kk | Fine area lighting system |
| JP2008078066A (en) * | 2006-09-25 | 2008-04-03 | Kyoto Denkiki Kk | Ring-like lighting system and method of manufacturing the same |
| CN101158463A (en) * | 2007-10-26 | 2008-04-09 | 华南理工大学 | Light source device used for circuit board automatic optical detection device |
| CN201173397Y (en) * | 2008-03-14 | 2008-12-31 | 东莞康视达自动化科技有限公司 | Automatic optical detection device light source for printed circuit board |
-
2012
- 2012-01-19 CN CN2012100158942A patent/CN103216763A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH112598A (en) * | 1997-06-12 | 1999-01-06 | Shimu:Kk | Fine area lighting system |
| JP2008078066A (en) * | 2006-09-25 | 2008-04-03 | Kyoto Denkiki Kk | Ring-like lighting system and method of manufacturing the same |
| CN101158463A (en) * | 2007-10-26 | 2008-04-09 | 华南理工大学 | Light source device used for circuit board automatic optical detection device |
| CN201173397Y (en) * | 2008-03-14 | 2008-12-31 | 东莞康视达自动化科技有限公司 | Automatic optical detection device light source for printed circuit board |
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Application publication date: 20130724 |