| ??? 01/29/09 08:13 Read: times |
#161812 - speed is essential when drawing Responding to: ???'s previous message |
The problem with scanning like a TV is that the laser needds quite high intensity, since it has to scan a significant area.
If drawing in X-Y, then you normally don't have time for any feedback loop. You just calibrate the system manually to know what analog values that represents the two ends of a movement, and then drive a voice coil run as fast as possible. The big thing here is speed - not precision - since you must be able to do a full trace within a very limited time to get your eyes to see a static drawing. Most people who tries this uses voice coils from loudspeakers, since they are designed for very high speed and reasonably good linearity. |
| Topic | Author | Date |
| Closed loop for HDD head coil help | 01/01/70 00:00 | |
| Maybe it will work ... or maybe not. | 01/01/70 00:00 | |
| Gradient transparency + led + photo-diode? | 01/01/70 00:00 | |
| it will not be easy | 01/01/70 00:00 | |
| more info | 01/01/70 00:00 | |
| It's not as easy as one might think | 01/01/70 00:00 | |
| harder than I thought | 01/01/70 00:00 | |
| There are ways ... | 01/01/70 00:00 | |
| speed is essential when drawing | 01/01/70 00:00 | |
| Yes, faster is better in this case | 01/01/70 00:00 | |
| Relativity | 01/01/70 00:00 | |
| That would likely work | 01/01/70 00:00 | |
Flexible Thinking - Flexible Arm | 01/01/70 00:00 |