Contents
Why is my photoresist PCB not working well?
Leaving it in developing fluid long time is the cause of the failure. After fine only the pattern on the board, flush out well with clean water. Development is complete. If you find the photoresist blocky and remain, do not force to melt it, but flush out with clean water.
What are the advantages and disadvantages of photoresist?
Both negative and positive photoresists have advantages and disadvantages. The advantages of negative photoresists are good adhesion to silicon, lower cost, and a shorter processing time. The advantages of positive photoresists are better resolution and thermal stability. Fig. 11.2 shows the result of the exposure of both photoresists.
How to make photoresist PCB with OHP sheet?
About Positive Mask (The procedure is as same as a board of Sunhayato Corp.) １．Use OHP sheet for Inkjet printer. ２．There is thickness on a OHPseet. Printed aspect below, and light does not begin it from the side. For exposure, put a printed side of board to prevent, due to thickness of OHP Sheet.
How is a photoresist developed after exposure to light?
After exposure to light, the photoresist is developed. It is immersed in a chemical solution, called the developer, which dissolves the unexposed portions of the photoresist (in the case of a negative resist) or the exposed portions in the case of a positive resist.
How to make photoresist PCB with sunhayato developer?
You can use Sunhayato’s Developer. Put 3 or 4 pcs. of developing tablet in 100cc of warm water. Put the exposued board and swing the case calmly. Then photoresist seep into warm water. Finish development shortly as you can. Confirm dissolving of photoresist and coming out of the pattern.
What should the PCB look like after exposure?
The pcb after exposure seems underdeveloped. The white areas in the artwork (where copper should not be etched away) should be dark blue after exposure. However as seen, that is not the case. They seem to have virtually no change in color at all. The tracks are fuzzy.
https://www.youtube.com/watch?v=dGDMSbEWUaI