By: Mark Roulo (nothanks.delete@this.xxx.com), July 8, 2022 9:09 am
Room: Moderated Discussions
Math Nerd (math.nerd.delete@this.nerds.com) on July 8, 2022 4:57 am wrote:
> Why is the largest die that fits on a reticle a rectangle (26mm x 33mm)? I expected it to be a square because
> I thought the optics would be circularly symmetrical and a square is closer to a circle than a rectangle.
Short answer: I don't know.
But, I'll note that the masks (which tend to be 4x the size of the thing being produced) ARE squares. 6" seems to be popular. There may be some "housekeeping" pattern (e.g. alignment marks?) in the unused area.
> Why is the largest die that fits on a reticle a rectangle (26mm x 33mm)? I expected it to be a square because
> I thought the optics would be circularly symmetrical and a square is closer to a circle than a rectangle.
Short answer: I don't know.
But, I'll note that the masks (which tend to be 4x the size of the thing being produced) ARE squares. 6" seems to be popular. There may be some "housekeeping" pattern (e.g. alignment marks?) in the unused area.
| Topic | Posted By | Date |
|---|---|---|
| Shape of largest die that fits on reticle | Math Nerd | 2022/07/08 04:57 AM |
| Shape of largest die that fits on reticle | Doug S | 2022/07/08 06:39 AM |
| Shape of largest die that fits on reticle | Mark Roulo | 2022/07/08 09:09 AM |
| Shape of largest die that fits on reticle | anonymou5 | 2022/07/08 10:29 AM |
| Shape of largest die that fits on reticle | Adrian | 2022/07/08 10:18 PM |
| Shape of largest die that fits on reticle | David Hess | 2022/07/14 04:28 PM |