Laser Printer Hewlett
January 21st, 2010
Laser Printer Hewlett
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What is the RPM of the reflector for a typical laser printer and what is the switching speed of the laser diod?
It is a HP4V model (Hewlett Packard). Please provide links to a technical site.
I can't find the specifications, but I can make an educated guess:
- The printer has a maximum resolution of 600 dpi, roughly 25 x 25 dots
- It can print up to 16 pages per minute
- The normal height of letter paper is 11 inches
Assuming the image forming process is the bottleneck, the laser unit needs to 11 x 25 = 275 lines per page, 4,400 lines for 16 pages.
The reflector mirror in the laser unit is 6 sided though, meaning 1 revolution equals 6 lines. 4,400 / 6 = 733 rpm
For the diode:
4,400 lines per minute = 73 lines per second
1 line would be 1 / 73.3 = 0.0136 seconds
in that 0.0136 the laser needs to produce an 8.5 inch line at 25 dots per inch, equals 213 dots.
213 dots in 0.0136 seconds, means 1 dot every 0.0000642 seconds. Or 15.600 dots per second which would have to be the switching speed of the diode.
Again, I could be totally wrong... But I can't imagine why you wouldn't let a printer print faster if the laser could handle it.
